libata-core.c 175.6 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from http://www.t13.org/ and
 *  http://www.sata-io.org/
 *
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 *  Standards documents from:
 *	http://www.t13.org (ATA standards, PCI DMA IDE spec)
 *	http://www.t10.org (SCSI MMC - for ATAPI MMC)
 *	http://www.sata-io.org (SATA)
 *	http://www.compactflash.org (CF)
 *	http://www.qic.org (QIC157 - Tape and DSC)
 *	http://www.ce-ata.org (CE-ATA: not supported)
 *
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 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/suspend.h>
#include <linux/workqueue.h>
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#include <linux/scatterlist.h>
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#include <linux/io.h>
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#include <linux/async.h>
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#include <linux/log2.h>
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#include <linux/slab.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <asm/byteorder.h>
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#include <linux/cdrom.h>
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#include <linux/ratelimit.h>
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#include <linux/pm_runtime.h>
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#include <linux/platform_device.h>
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#include "libata.h"
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#include "libata-transport.h"
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/* debounce timing parameters in msecs { interval, duration, timeout } */
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const unsigned long sata_deb_timing_normal[]		= {   5,  100, 2000 };
const unsigned long sata_deb_timing_hotplug[]		= {  25,  500, 2000 };
const unsigned long sata_deb_timing_long[]		= { 100, 2000, 5000 };
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const struct ata_port_operations ata_base_port_ops = {
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	.prereset		= ata_std_prereset,
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	.postreset		= ata_std_postreset,
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	.error_handler		= ata_std_error_handler,
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	.sched_eh		= ata_std_sched_eh,
	.end_eh			= ata_std_end_eh,
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};

const struct ata_port_operations sata_port_ops = {
	.inherits		= &ata_base_port_ops,

	.qc_defer		= ata_std_qc_defer,
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	.hardreset		= sata_std_hardreset,
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};

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static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
static void ata_dev_xfermask(struct ata_device *dev);
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static unsigned long ata_dev_blacklisted(const struct ata_device *dev);
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atomic_t ata_print_id = ATOMIC_INIT(0);
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atomic_t host_print_id = ATOMIC_INIT(0);
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struct ata_force_param {
	const char	*name;
	unsigned int	cbl;
	int		spd_limit;
	unsigned long	xfer_mask;
	unsigned int	horkage_on;
	unsigned int	horkage_off;
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	unsigned int	lflags;
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};

struct ata_force_ent {
	int			port;
	int			device;
	struct ata_force_param	param;
};

static struct ata_force_ent *ata_force_tbl;
static int ata_force_tbl_size;

static char ata_force_param_buf[PAGE_SIZE] __initdata;
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/* param_buf is thrown away after initialization, disallow read */
module_param_string(force, ata_force_param_buf, sizeof(ata_force_param_buf), 0);
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MODULE_PARM_DESC(force, "Force ATA configurations including cable type, link speed and transfer mode (see Documentation/kernel-parameters.txt for details)");

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static int atapi_enabled = 1;
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module_param(atapi_enabled, int, 0444);
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MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on [default])");
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static int atapi_dmadir = 0;
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module_param(atapi_dmadir, int, 0444);
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MODULE_PARM_DESC(atapi_dmadir, "Enable ATAPI DMADIR bridge support (0=off [default], 1=on)");
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int atapi_passthru16 = 1;
module_param(atapi_passthru16, int, 0444);
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MODULE_PARM_DESC(atapi_passthru16, "Enable ATA_16 passthru for ATAPI devices (0=off, 1=on [default])");
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int libata_fua = 0;
module_param_named(fua, libata_fua, int, 0444);
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MODULE_PARM_DESC(fua, "FUA support (0=off [default], 1=on)");
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static int ata_ignore_hpa;
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module_param_named(ignore_hpa, ata_ignore_hpa, int, 0644);
MODULE_PARM_DESC(ignore_hpa, "Ignore HPA limit (0=keep BIOS limits, 1=ignore limits, using full disk)");

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static int libata_dma_mask = ATA_DMA_MASK_ATA|ATA_DMA_MASK_ATAPI|ATA_DMA_MASK_CFA;
module_param_named(dma, libata_dma_mask, int, 0444);
MODULE_PARM_DESC(dma, "DMA enable/disable (0x1==ATA, 0x2==ATAPI, 0x4==CF)");

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static int ata_probe_timeout;
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module_param(ata_probe_timeout, int, 0444);
MODULE_PARM_DESC(ata_probe_timeout, "Set ATA probing timeout (seconds)");

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int libata_noacpi = 0;
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module_param_named(noacpi, libata_noacpi, int, 0444);
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MODULE_PARM_DESC(noacpi, "Disable the use of ACPI in probe/suspend/resume (0=off [default], 1=on)");
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int libata_allow_tpm = 0;
module_param_named(allow_tpm, libata_allow_tpm, int, 0444);
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MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)");
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static int atapi_an;
module_param(atapi_an, int, 0444);
MODULE_PARM_DESC(atapi_an, "Enable ATAPI AN media presence notification (0=0ff [default], 1=on)");

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MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("Library module for ATA devices");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

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static bool ata_sstatus_online(u32 sstatus)
{
	return (sstatus & 0xf) == 0x3;
}

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/**
 *	ata_link_next - link iteration helper
 *	@link: the previous link, NULL to start
 *	@ap: ATA port containing links to iterate
 *	@mode: iteration mode, one of ATA_LITER_*
 *
 *	LOCKING:
 *	Host lock or EH context.
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 *
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 *	RETURNS:
 *	Pointer to the next link.
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 */
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struct ata_link *ata_link_next(struct ata_link *link, struct ata_port *ap,
			       enum ata_link_iter_mode mode)
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{
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	BUG_ON(mode != ATA_LITER_EDGE &&
	       mode != ATA_LITER_PMP_FIRST && mode != ATA_LITER_HOST_FIRST);

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	/* NULL link indicates start of iteration */
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	if (!link)
		switch (mode) {
		case ATA_LITER_EDGE:
		case ATA_LITER_PMP_FIRST:
			if (sata_pmp_attached(ap))
				return ap->pmp_link;
			/* fall through */
		case ATA_LITER_HOST_FIRST:
			return &ap->link;
		}
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	/* we just iterated over the host link, what's next? */
	if (link == &ap->link)
		switch (mode) {
		case ATA_LITER_HOST_FIRST:
			if (sata_pmp_attached(ap))
				return ap->pmp_link;
			/* fall through */
		case ATA_LITER_PMP_FIRST:
			if (unlikely(ap->slave_link))
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				return ap->slave_link;
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			/* fall through */
		case ATA_LITER_EDGE:
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			return NULL;
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		}
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	/* slave_link excludes PMP */
	if (unlikely(link == ap->slave_link))
		return NULL;

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	/* we were over a PMP link */
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	if (++link < ap->pmp_link + ap->nr_pmp_links)
		return link;
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	if (mode == ATA_LITER_PMP_FIRST)
		return &ap->link;

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	return NULL;
}

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/**
 *	ata_dev_next - device iteration helper
 *	@dev: the previous device, NULL to start
 *	@link: ATA link containing devices to iterate
 *	@mode: iteration mode, one of ATA_DITER_*
 *
 *	LOCKING:
 *	Host lock or EH context.
 *
 *	RETURNS:
 *	Pointer to the next device.
 */
struct ata_device *ata_dev_next(struct ata_device *dev, struct ata_link *link,
				enum ata_dev_iter_mode mode)
{
	BUG_ON(mode != ATA_DITER_ENABLED && mode != ATA_DITER_ENABLED_REVERSE &&
	       mode != ATA_DITER_ALL && mode != ATA_DITER_ALL_REVERSE);

	/* NULL dev indicates start of iteration */
	if (!dev)
		switch (mode) {
		case ATA_DITER_ENABLED:
		case ATA_DITER_ALL:
			dev = link->device;
			goto check;
		case ATA_DITER_ENABLED_REVERSE:
		case ATA_DITER_ALL_REVERSE:
			dev = link->device + ata_link_max_devices(link) - 1;
			goto check;
		}

 next:
	/* move to the next one */
	switch (mode) {
	case ATA_DITER_ENABLED:
	case ATA_DITER_ALL:
		if (++dev < link->device + ata_link_max_devices(link))
			goto check;
		return NULL;
	case ATA_DITER_ENABLED_REVERSE:
	case ATA_DITER_ALL_REVERSE:
		if (--dev >= link->device)
			goto check;
		return NULL;
	}

 check:
	if ((mode == ATA_DITER_ENABLED || mode == ATA_DITER_ENABLED_REVERSE) &&
	    !ata_dev_enabled(dev))
		goto next;
	return dev;
}

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/**
 *	ata_dev_phys_link - find physical link for a device
 *	@dev: ATA device to look up physical link for
 *
 *	Look up physical link which @dev is attached to.  Note that
 *	this is different from @dev->link only when @dev is on slave
 *	link.  For all other cases, it's the same as @dev->link.
 *
 *	LOCKING:
 *	Don't care.
 *
 *	RETURNS:
 *	Pointer to the found physical link.
 */
struct ata_link *ata_dev_phys_link(struct ata_device *dev)
{
	struct ata_port *ap = dev->link->ap;

	if (!ap->slave_link)
		return dev->link;
	if (!dev->devno)
		return &ap->link;
	return ap->slave_link;
}

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/**
 *	ata_force_cbl - force cable type according to libata.force
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 *	@ap: ATA port of interest
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 *
 *	Force cable type according to libata.force and whine about it.
 *	The last entry which has matching port number is used, so it
 *	can be specified as part of device force parameters.  For
 *	example, both "a:40c,1.00:udma4" and "1.00:40c,udma4" have the
 *	same effect.
 *
 *	LOCKING:
 *	EH context.
 */
void ata_force_cbl(struct ata_port *ap)
{
	int i;

	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
		const struct ata_force_ent *fe = &ata_force_tbl[i];

		if (fe->port != -1 && fe->port != ap->print_id)
			continue;

		if (fe->param.cbl == ATA_CBL_NONE)
			continue;

		ap->cbl = fe->param.cbl;
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		ata_port_notice(ap, "FORCE: cable set to %s\n", fe->param.name);
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		return;
	}
}

/**
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 *	ata_force_link_limits - force link limits according to libata.force
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 *	@link: ATA link of interest
 *
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 *	Force link flags and SATA spd limit according to libata.force
 *	and whine about it.  When only the port part is specified
 *	(e.g. 1:), the limit applies to all links connected to both
 *	the host link and all fan-out ports connected via PMP.  If the
 *	device part is specified as 0 (e.g. 1.00:), it specifies the
 *	first fan-out link not the host link.  Device number 15 always
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 *	points to the host link whether PMP is attached or not.  If the
 *	controller has slave link, device number 16 points to it.
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 *
 *	LOCKING:
 *	EH context.
 */
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static void ata_force_link_limits(struct ata_link *link)
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{
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	bool did_spd = false;
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	int linkno = link->pmp;
	int i;
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	if (ata_is_host_link(link))
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		linkno += 15;
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	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
		const struct ata_force_ent *fe = &ata_force_tbl[i];

		if (fe->port != -1 && fe->port != link->ap->print_id)
			continue;

		if (fe->device != -1 && fe->device != linkno)
			continue;

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		/* only honor the first spd limit */
		if (!did_spd && fe->param.spd_limit) {
			link->hw_sata_spd_limit = (1 << fe->param.spd_limit) - 1;
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			ata_link_notice(link, "FORCE: PHY spd limit set to %s\n",
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					fe->param.name);
			did_spd = true;
		}
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		/* let lflags stack */
		if (fe->param.lflags) {
			link->flags |= fe->param.lflags;
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			ata_link_notice(link,
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					"FORCE: link flag 0x%x forced -> 0x%x\n",
					fe->param.lflags, link->flags);
		}
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	}
}

/**
 *	ata_force_xfermask - force xfermask according to libata.force
 *	@dev: ATA device of interest
 *
 *	Force xfer_mask according to libata.force and whine about it.
 *	For consistency with link selection, device number 15 selects
 *	the first device connected to the host link.
 *
 *	LOCKING:
 *	EH context.
 */
static void ata_force_xfermask(struct ata_device *dev)
{
	int devno = dev->link->pmp + dev->devno;
	int alt_devno = devno;
	int i;

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	/* allow n.15/16 for devices attached to host port */
	if (ata_is_host_link(dev->link))
		alt_devno += 15;
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	for (i = ata_force_tbl_size - 1; i >= 0; i--) {
		const struct ata_force_ent *fe = &ata_force_tbl[i];
		unsigned long pio_mask, mwdma_mask, udma_mask;

		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
			continue;

		if (fe->device != -1 && fe->device != devno &&
		    fe->device != alt_devno)
			continue;

		if (!fe->param.xfer_mask)
			continue;

		ata_unpack_xfermask(fe->param.xfer_mask,
				    &pio_mask, &mwdma_mask, &udma_mask);
		if (udma_mask)
			dev->udma_mask = udma_mask;
		else if (mwdma_mask) {
			dev->udma_mask = 0;
			dev->mwdma_mask = mwdma_mask;
		} else {
			dev->udma_mask = 0;
			dev->mwdma_mask = 0;
			dev->pio_mask = pio_mask;
		}

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		ata_dev_notice(dev, "FORCE: xfer_mask set to %s\n",
			       fe->param.name);
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		return;
	}
}

/**
 *	ata_force_horkage - force horkage according to libata.force
 *	@dev: ATA device of interest
 *
 *	Force horkage according to libata.force and whine about it.
 *	For consistency with link selection, device number 15 selects
 *	the first device connected to the host link.
 *
 *	LOCKING:
 *	EH context.
 */
static void ata_force_horkage(struct ata_device *dev)
{
	int devno = dev->link->pmp + dev->devno;
	int alt_devno = devno;
	int i;

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	/* allow n.15/16 for devices attached to host port */
	if (ata_is_host_link(dev->link))
		alt_devno += 15;
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	for (i = 0; i < ata_force_tbl_size; i++) {
		const struct ata_force_ent *fe = &ata_force_tbl[i];

		if (fe->port != -1 && fe->port != dev->link->ap->print_id)
			continue;

		if (fe->device != -1 && fe->device != devno &&
		    fe->device != alt_devno)
			continue;

		if (!(~dev->horkage & fe->param.horkage_on) &&
		    !(dev->horkage & fe->param.horkage_off))
			continue;

		dev->horkage |= fe->param.horkage_on;
		dev->horkage &= ~fe->param.horkage_off;

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		ata_dev_notice(dev, "FORCE: horkage modified (%s)\n",
			       fe->param.name);
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	}
}

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/**
 *	atapi_cmd_type - Determine ATAPI command type from SCSI opcode
 *	@opcode: SCSI opcode
 *
 *	Determine ATAPI command type from @opcode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	ATAPI_{READ|WRITE|READ_CD|PASS_THRU|MISC}
 */
int atapi_cmd_type(u8 opcode)
{
	switch (opcode) {
	case GPCMD_READ_10:
	case GPCMD_READ_12:
		return ATAPI_READ;

	case GPCMD_WRITE_10:
	case GPCMD_WRITE_12:
	case GPCMD_WRITE_AND_VERIFY_10:
		return ATAPI_WRITE;

	case GPCMD_READ_CD:
	case GPCMD_READ_CD_MSF:
		return ATAPI_READ_CD;

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	case ATA_16:
	case ATA_12:
		if (atapi_passthru16)
			return ATAPI_PASS_THRU;
		/* fall thru */
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	default:
		return ATAPI_MISC;
	}
}

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/**
 *	ata_tf_to_fis - Convert ATA taskfile to SATA FIS structure
 *	@tf: Taskfile to convert
 *	@pmp: Port multiplier port
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 *	@is_cmd: This FIS is for command
 *	@fis: Buffer into which data will output
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 *
 *	Converts a standard ATA taskfile to a Serial ATA
 *	FIS structure (Register - Host to Device).
 *
 *	LOCKING:
 *	Inherited from caller.
 */
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void ata_tf_to_fis(const struct ata_taskfile *tf, u8 pmp, int is_cmd, u8 *fis)
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{
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	fis[0] = 0x27;			/* Register - Host to Device FIS */
	fis[1] = pmp & 0xf;		/* Port multiplier number*/
	if (is_cmd)
		fis[1] |= (1 << 7);	/* bit 7 indicates Command FIS */

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	fis[2] = tf->command;
	fis[3] = tf->feature;

	fis[4] = tf->lbal;
	fis[5] = tf->lbam;
	fis[6] = tf->lbah;
	fis[7] = tf->device;

	fis[8] = tf->hob_lbal;
	fis[9] = tf->hob_lbam;
	fis[10] = tf->hob_lbah;
	fis[11] = tf->hob_feature;

	fis[12] = tf->nsect;
	fis[13] = tf->hob_nsect;
	fis[14] = 0;
	fis[15] = tf->ctl;

	fis[16] = 0;
	fis[17] = 0;
	fis[18] = 0;
	fis[19] = 0;
}

/**
 *	ata_tf_from_fis - Convert SATA FIS to ATA taskfile
 *	@fis: Buffer from which data will be input
 *	@tf: Taskfile to output
 *
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 *	Converts a serial ATA FIS structure to a standard ATA taskfile.
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 *
 *	LOCKING:
 *	Inherited from caller.
 */

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void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf)
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{
	tf->command	= fis[2];	/* status */
	tf->feature	= fis[3];	/* error */

	tf->lbal	= fis[4];
	tf->lbam	= fis[5];
	tf->lbah	= fis[6];
	tf->device	= fis[7];

	tf->hob_lbal	= fis[8];
	tf->hob_lbam	= fis[9];
	tf->hob_lbah	= fis[10];

	tf->nsect	= fis[12];
	tf->hob_nsect	= fis[13];
}

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static const u8 ata_rw_cmds[] = {
	/* pio multi */
	ATA_CMD_READ_MULTI,
	ATA_CMD_WRITE_MULTI,
	ATA_CMD_READ_MULTI_EXT,
	ATA_CMD_WRITE_MULTI_EXT,
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	0,
	0,
	0,
	ATA_CMD_WRITE_MULTI_FUA_EXT,
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	/* pio */
	ATA_CMD_PIO_READ,
	ATA_CMD_PIO_WRITE,
	ATA_CMD_PIO_READ_EXT,
	ATA_CMD_PIO_WRITE_EXT,
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	0,
	0,
	0,
	0,
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	/* dma */
	ATA_CMD_READ,
	ATA_CMD_WRITE,
	ATA_CMD_READ_EXT,
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	ATA_CMD_WRITE_EXT,
	0,
	0,
	0,
	ATA_CMD_WRITE_FUA_EXT
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};
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/**
639
 *	ata_rwcmd_protocol - set taskfile r/w commands and protocol
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 *	@tf: command to examine and configure
 *	@dev: device tf belongs to
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 *
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 *	Examine the device configuration and tf->flags to calculate
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 *	the proper read/write commands and protocol to use.
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 *
 *	LOCKING:
 *	caller.
 */
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static int ata_rwcmd_protocol(struct ata_taskfile *tf, struct ata_device *dev)
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{
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	u8 cmd;
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	int index, fua, lba48, write;
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	fua = (tf->flags & ATA_TFLAG_FUA) ? 4 : 0;
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	lba48 = (tf->flags & ATA_TFLAG_LBA48) ? 2 : 0;
	write = (tf->flags & ATA_TFLAG_WRITE) ? 1 : 0;
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	if (dev->flags & ATA_DFLAG_PIO) {
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else if (lba48 && (dev->link->ap->flags & ATA_FLAG_PIO_LBA48)) {
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		/* Unable to use DMA due to host limitation */
		tf->protocol = ATA_PROT_PIO;
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		index = dev->multi_count ? 0 : 8;
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	} else {
		tf->protocol = ATA_PROT_DMA;
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		index = 16;
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	}
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	cmd = ata_rw_cmds[index + fua + lba48 + write];
	if (cmd) {
		tf->command = cmd;
		return 0;
	}
	return -1;
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}

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/**
 *	ata_tf_read_block - Read block address from ATA taskfile
 *	@tf: ATA taskfile of interest
 *	@dev: ATA device @tf belongs to
 *
 *	LOCKING:
 *	None.
 *
 *	Read block address from @tf.  This function can handle all
 *	three address formats - LBA, LBA48 and CHS.  tf->protocol and
 *	flags select the address format to use.
 *
 *	RETURNS:
 *	Block address read from @tf.
 */
u64 ata_tf_read_block(struct ata_taskfile *tf, struct ata_device *dev)
{
	u64 block = 0;

	if (tf->flags & ATA_TFLAG_LBA) {
		if (tf->flags & ATA_TFLAG_LBA48) {
			block |= (u64)tf->hob_lbah << 40;
			block |= (u64)tf->hob_lbam << 32;
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			block |= (u64)tf->hob_lbal << 24;
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		} else
			block |= (tf->device & 0xf) << 24;

		block |= tf->lbah << 16;
		block |= tf->lbam << 8;
		block |= tf->lbal;
	} else {
		u32 cyl, head, sect;

		cyl = tf->lbam | (tf->lbah << 8);
		head = tf->device & 0xf;
		sect = tf->lbal;

716
		if (!sect) {
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			ata_dev_warn(dev,
				     "device reported invalid CHS sector 0\n");
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			sect = 1; /* oh well */
		}

		block = (cyl * dev->heads + head) * dev->sectors + sect - 1;
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	}

	return block;
}

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/**
 *	ata_build_rw_tf - Build ATA taskfile for given read/write request
 *	@tf: Target ATA taskfile
 *	@dev: ATA device @tf belongs to
 *	@block: Block address
 *	@n_block: Number of blocks
 *	@tf_flags: RW/FUA etc...
 *	@tag: tag
 *
 *	LOCKING:
 *	None.
 *
 *	Build ATA taskfile @tf for read/write request described by
 *	@block, @n_block, @tf_flags and @tag on @dev.
 *
 *	RETURNS:
 *
 *	0 on success, -ERANGE if the request is too large for @dev,
 *	-EINVAL if the request is invalid.
 */
int ata_build_rw_tf(struct ata_taskfile *tf, struct ata_device *dev,
		    u64 block, u32 n_block, unsigned int tf_flags,
		    unsigned int tag)
{
	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf->flags |= tf_flags;

755
	if (ata_ncq_enabled(dev) && likely(tag != ATA_TAG_INTERNAL)) {
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		/* yay, NCQ */
		if (!lba_48_ok(block, n_block))
			return -ERANGE;

		tf->protocol = ATA_PROT_NCQ;
		tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;

		if (tf->flags & ATA_TFLAG_WRITE)
			tf->command = ATA_CMD_FPDMA_WRITE;
		else
			tf->command = ATA_CMD_FPDMA_READ;

		tf->nsect = tag << 3;
		tf->hob_feature = (n_block >> 8) & 0xff;
		tf->feature = n_block & 0xff;

		tf->hob_lbah = (block >> 40) & 0xff;
		tf->hob_lbam = (block >> 32) & 0xff;
		tf->hob_lbal = (block >> 24) & 0xff;
		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;

779
		tf->device = ATA_LBA;
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		if (tf->flags & ATA_TFLAG_FUA)
			tf->device |= 1 << 7;
	} else if (dev->flags & ATA_DFLAG_LBA) {
		tf->flags |= ATA_TFLAG_LBA;

		if (lba_28_ok(block, n_block)) {
			/* use LBA28 */
			tf->device |= (block >> 24) & 0xf;
		} else if (lba_48_ok(block, n_block)) {
			if (!(dev->flags & ATA_DFLAG_LBA48))
				return -ERANGE;

			/* use LBA48 */
			tf->flags |= ATA_TFLAG_LBA48;

			tf->hob_nsect = (n_block >> 8) & 0xff;

			tf->hob_lbah = (block >> 40) & 0xff;
			tf->hob_lbam = (block >> 32) & 0xff;
			tf->hob_lbal = (block >> 24) & 0xff;
		} else
			/* request too large even for LBA48 */
			return -ERANGE;

		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
			return -EINVAL;

		tf->nsect = n_block & 0xff;

		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;

		tf->device |= ATA_LBA;
	} else {
		/* CHS */
		u32 sect, head, cyl, track;

		/* The request -may- be too large for CHS addressing. */
		if (!lba_28_ok(block, n_block))
			return -ERANGE;

		if (unlikely(ata_rwcmd_protocol(tf, dev) < 0))
			return -EINVAL;

		/* Convert LBA to CHS */
		track = (u32)block / dev->sectors;
		cyl   = track / dev->heads;
		head  = track % dev->heads;
		sect  = (u32)block % dev->sectors + 1;

		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
			(u32)block, track, cyl, head, sect);

		/* Check whether the converted CHS can fit.
		   Cylinder: 0-65535
		   Head: 0-15
		   Sector: 1-255*/
		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
			return -ERANGE;

		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
		tf->lbal = sect;
		tf->lbam = cyl;
		tf->lbah = cyl >> 8;
		tf->device |= head;
	}

	return 0;
}

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/**
 *	ata_pack_xfermask - Pack pio, mwdma and udma masks into xfer_mask
 *	@pio_mask: pio_mask
 *	@mwdma_mask: mwdma_mask
 *	@udma_mask: udma_mask
 *
 *	Pack @pio_mask, @mwdma_mask and @udma_mask into a single
 *	unsigned int xfer_mask.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Packed xfer_mask.
 */
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unsigned long ata_pack_xfermask(unsigned long pio_mask,
				unsigned long mwdma_mask,
				unsigned long udma_mask)
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{
	return ((pio_mask << ATA_SHIFT_PIO) & ATA_MASK_PIO) |
		((mwdma_mask << ATA_SHIFT_MWDMA) & ATA_MASK_MWDMA) |
		((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
}

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/**
 *	ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
 *	@xfer_mask: xfer_mask to unpack
 *	@pio_mask: resulting pio_mask
 *	@mwdma_mask: resulting mwdma_mask
 *	@udma_mask: resulting udma_mask
 *
 *	Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
 *	Any NULL distination masks will be ignored.
 */
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void ata_unpack_xfermask(unsigned long xfer_mask, unsigned long *pio_mask,
			 unsigned long *mwdma_mask, unsigned long *udma_mask)
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{
	if (pio_mask)
		*pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
	if (mwdma_mask)
		*mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
	if (udma_mask)
		*udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
}

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static const struct ata_xfer_ent {
897
	int shift, bits;
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	u8 base;
} ata_xfer_tbl[] = {
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	{ ATA_SHIFT_PIO, ATA_NR_PIO_MODES, XFER_PIO_0 },
	{ ATA_SHIFT_MWDMA, ATA_NR_MWDMA_MODES, XFER_MW_DMA_0 },
	{ ATA_SHIFT_UDMA, ATA_NR_UDMA_MODES, XFER_UDMA_0 },
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	{ -1, },
};

/**
 *	ata_xfer_mask2mode - Find matching XFER_* for the given xfer_mask
 *	@xfer_mask: xfer_mask of interest
 *
 *	Return matching XFER_* value for @xfer_mask.  Only the highest
 *	bit of @xfer_mask is considered.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
917
 *	Matching XFER_* value, 0xff if no match found.
918
 */
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u8 ata_xfer_mask2mode(unsigned long xfer_mask)
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{
	int highbit = fls(xfer_mask) - 1;
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (highbit >= ent->shift && highbit < ent->shift + ent->bits)
			return ent->base + highbit - ent->shift;
927
	return 0xff;
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}

/**
 *	ata_xfer_mode2mask - Find matching xfer_mask for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_mask for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_mask, 0 if no match found.
 */
942
unsigned long ata_xfer_mode2mask(u8 xfer_mode)
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{
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
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			return ((2 << (ent->shift + xfer_mode - ent->base)) - 1)
				& ~((1 << ent->shift) - 1);
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	return 0;
}

/**
 *	ata_xfer_mode2shift - Find matching xfer_shift for XFER_*
 *	@xfer_mode: XFER_* of interest
 *
 *	Return matching xfer_shift for @xfer_mode.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_shift, -1 if no match found.
 */
965
int ata_xfer_mode2shift(unsigned long xfer_mode)
966 967 968 969 970 971 972 973 974
{
	const struct ata_xfer_ent *ent;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (xfer_mode >= ent->base && xfer_mode < ent->base + ent->bits)
			return ent->shift;
	return -1;
}

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/**
976 977
 *	ata_mode_string - convert xfer_mask to string
 *	@xfer_mask: mask of bits supported; only highest bit counts.
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 *
 *	Determine string which represents the highest speed
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 *	(highest bit in @modemask).
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 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Constant C string representing highest speed listed in
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 *	@mode_mask, or the constant C string "<n/a>".
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 */
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const char *ata_mode_string(unsigned long xfer_mask)
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{
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	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
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		"PIO5",
		"PIO6",
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		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
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		"MWDMA3",
		"MWDMA4",
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		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
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	int highbit;
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	highbit = fls(xfer_mask) - 1;
	if (highbit >= 0 && highbit < ARRAY_SIZE(xfer_mode_str))
		return xfer_mode_str[highbit];
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	return "<n/a>";
}

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const char *sata_spd_string(unsigned int spd)
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{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
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		"6.0 Gbps",
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	};

	if (spd == 0 || (spd - 1) >= ARRAY_SIZE(spd_str))
		return "<unknown>";
	return spd_str[spd - 1];
}

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/**
 *	ata_dev_classify - determine device type based on ATA-spec signature
 *	@tf: ATA taskfile register set for device to be identified
 *
 *	Determine from taskfile register contents whether a device is
 *	ATA or ATAPI, as per "Signature and persistence" section
 *	of ATA/PI spec (volume 1, sect 5.14).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
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 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP or
 *	%ATA_DEV_UNKNOWN the event of failure.
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 */
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unsigned int ata_dev_classify(const struct ata_taskfile *tf)
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{
	/* Apple's open source Darwin code hints that some devices only
	 * put a proper signature into the LBA mid/high registers,
	 * So, we only check those.  It's sufficient for uniqueness.
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	 *
	 * ATA/ATAPI-7 (d1532v1r1: Feb. 19, 2003) specified separate
	 * signatures for ATA and ATAPI devices attached on SerialATA,
	 * 0x3c/0xc3 and 0x69/0x96 respectively.  However, SerialATA
	 * spec has never mentioned about using different signatures
	 * for ATA/ATAPI devices.  Then, Serial ATA II: Port
	 * Multiplier specification began to use 0x69/0x96 to identify
	 * port multpliers and 0x3c/0xc3 to identify SEMB device.
	 * ATA/ATAPI-7 dropped descriptions about 0x3c/0xc3 and
	 * 0x69/0x96 shortly and described them as reserved for
	 * SerialATA.
	 *
	 * We follow the current spec and consider that 0x69/0x96
	 * identifies a port multiplier and 0x3c/0xc3 a SEMB device.
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	 * Unfortunately, WDC WD1600JS-62MHB5 (a hard drive) reports
	 * SEMB signature.  This is worked around in
	 * ata_dev_read_id().
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	 */
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	if ((tf->lbam == 0) && (tf->lbah == 0)) {
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		DPRINTK("found ATA device by sig\n");
		return ATA_DEV_ATA;
	}

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	if ((tf->lbam == 0x14) && (tf->lbah == 0xeb)) {
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		DPRINTK("found ATAPI device by sig\n");
		return ATA_DEV_ATAPI;
	}

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	if ((tf->lbam == 0x69) && (tf->lbah == 0x96)) {
		DPRINTK("found PMP device by sig\n");
		return ATA_DEV_PMP;
	}

	if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
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		DPRINTK("found SEMB device by sig (could be ATA device)\n");
		return ATA_DEV_SEMB;
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	}

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	DPRINTK("unknown device\n");
	return ATA_DEV_UNKNOWN;
}

/**
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 *	ata_id_string - Convert IDENTIFY DEVICE page into string
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 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an even number.
 *
 *	The strings in the IDENTIFY DEVICE page are broken up into
 *	16-bit chunks.  Run through the string, and output each
 *	8-bit chunk linearly, regardless of platform.
 *
 *	LOCKING:
 *	caller.
 */

1111 1112
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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{
	unsigned int c;

1116 1117
	BUG_ON(len & 1);

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	while (len > 0) {
		c = id[ofs] >> 8;
		*s = c;
		s++;

		c = id[ofs] & 0xff;
		*s = c;
		s++;

		ofs++;
		len -= 2;
	}
}

1132
/**
1133
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1134 1135 1136 1137 1138
 *	@id: IDENTIFY DEVICE results we will examine
 *	@s: string into which data is output
 *	@ofs: offset into identify device page
 *	@len: length of string to return. must be an odd number.
 *
1139
 *	This function is identical to ata_id_string except that it
1140 1141 1142 1143 1144 1145
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1146 1147
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1148 1149 1150
{
	unsigned char *p;

1151
	ata_id_string(id, s, ofs, len - 1);
1152 1153 1154 1155 1156 1157

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
E
Edward Falk 已提交
1158

T
Tejun Heo 已提交
1159 1160 1161 1162
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
1163
			return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
T
Tejun Heo 已提交
1164
		else
1165
			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
T
Tejun Heo 已提交
1166 1167
	} else {
		if (ata_id_current_chs_valid(id))
1168 1169
			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
			       id[ATA_ID_CUR_SECTORS];
T
Tejun Heo 已提交
1170
		else
1171 1172
			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
			       id[ATA_ID_SECTORS];
T
Tejun Heo 已提交
1173 1174 1175
	}
}

1176
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1177 1178 1179 1180 1181
{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1182
	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
A
Alan Cox 已提交
1183 1184 1185 1186
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

1187
	return sectors;
A
Alan Cox 已提交
1188 1189
}

1190
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1191 1192 1193 1194 1195 1196 1197 1198
{
	u64 sectors = 0;

	sectors |= (tf->device & 0x0f) << 24;
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

1199
	return sectors;
A
Alan Cox 已提交
1200 1201 1202
}

/**
1203 1204 1205
 *	ata_read_native_max_address - Read native max address
 *	@dev: target device
 *	@max_sectors: out parameter for the result native max address
A
Alan Cox 已提交
1206
 *
1207 1208
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
Alan Cox 已提交
1209
 *
1210 1211 1212
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
Alan Cox 已提交
1213
 */
1214
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
1215
{
1216
	unsigned int err_mask;
A
Alan Cox 已提交
1217
	struct ata_taskfile tf;
1218
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1219 1220 1221

	ata_tf_init(dev, &tf);

1222
	/* always clear all address registers */
A
Alan Cox 已提交
1223 1224
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1225 1226 1227 1228 1229
	if (lba48) {
		tf.command = ATA_CMD_READ_NATIVE_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;
	} else
		tf.command = ATA_CMD_READ_NATIVE_MAX;
A
Alan Cox 已提交
1230 1231

	tf.protocol |= ATA_PROT_NODATA;
1232 1233
	tf.device |= ATA_LBA;

1234
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1235
	if (err_mask) {
1236 1237 1238
		ata_dev_warn(dev,
			     "failed to read native max address (err_mask=0x%x)\n",
			     err_mask);
1239 1240 1241 1242
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
A
Alan Cox 已提交
1243

1244
	if (lba48)
1245
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1246
	else
1247
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1248
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1249
		(*max_sectors)--;
1250
	return 0;
A
Alan Cox 已提交
1251 1252 1253
}

/**
1254 1255
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
R
Randy Dunlap 已提交
1256
 *	@new_sectors: new max sectors value to set for the device
A
Alan Cox 已提交
1257
 *
1258 1259 1260 1261 1262 1263
 *	Set max sectors of @dev to @new_sectors.
 *
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted or denied (due to
 *	previous non-volatile SET_MAX) by the drive.  -EIO on other
 *	errors.
A
Alan Cox 已提交
1264
 */
T
Tejun Heo 已提交
1265
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
1266
{
1267
	unsigned int err_mask;
A
Alan Cox 已提交
1268
	struct ata_taskfile tf;
1269
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1270 1271 1272 1273 1274 1275

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1276 1277 1278 1279 1280 1281 1282 1283

	if (lba48) {
		tf.command = ATA_CMD_SET_MAX_EXT;
		tf.flags |= ATA_TFLAG_LBA48;

		tf.hob_lbal = (new_sectors >> 24) & 0xff;
		tf.hob_lbam = (new_sectors >> 32) & 0xff;
		tf.hob_lbah = (new_sectors >> 40) & 0xff;
T
Tejun Heo 已提交
1284
	} else {
1285 1286
		tf.command = ATA_CMD_SET_MAX;

T
Tejun Heo 已提交
1287 1288 1289
		tf.device |= (new_sectors >> 24) & 0xf;
	}

A
Alan Cox 已提交
1290
	tf.protocol |= ATA_PROT_NODATA;
1291
	tf.device |= ATA_LBA;
A
Alan Cox 已提交
1292 1293 1294 1295 1296

	tf.lbal = (new_sectors >> 0) & 0xff;
	tf.lbam = (new_sectors >> 8) & 0xff;
	tf.lbah = (new_sectors >> 16) & 0xff;

1297
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1298
	if (err_mask) {
1299 1300 1301
		ata_dev_warn(dev,
			     "failed to set max address (err_mask=0x%x)\n",
			     err_mask);
1302 1303 1304 1305 1306 1307 1308
		if (err_mask == AC_ERR_DEV &&
		    (tf.feature & (ATA_ABORTED | ATA_IDNF)))
			return -EACCES;
		return -EIO;
	}

	return 0;
A
Alan Cox 已提交
1309 1310 1311 1312 1313 1314 1315 1316 1317
}

/**
 *	ata_hpa_resize		-	Resize a device with an HPA set
 *	@dev: Device to resize
 *
 *	Read the size of an LBA28 or LBA48 disk with HPA features and resize
 *	it if required to the full size of the media. The caller must check
 *	the drive has the HPA feature set enabled.
T
Tejun Heo 已提交
1318 1319 1320
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
Alan Cox 已提交
1321
 */
T
Tejun Heo 已提交
1322
static int ata_hpa_resize(struct ata_device *dev)
A
Alan Cox 已提交
1323
{
T
Tejun Heo 已提交
1324 1325
	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
T
Tejun Heo 已提交
1326
	bool unlock_hpa = ata_ignore_hpa || dev->flags & ATA_DFLAG_UNLOCK_HPA;
T
Tejun Heo 已提交
1327 1328
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1329
	int rc;
J
Jeff Garzik 已提交
1330

T
Tejun Heo 已提交
1331 1332 1333 1334
	/* do we need to do it? */
	if (dev->class != ATA_DEV_ATA ||
	    !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
	    (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1335
		return 0;
A
Alan Cox 已提交
1336

T
Tejun Heo 已提交
1337 1338 1339
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
T
Tejun Heo 已提交
1340 1341
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
T
Tejun Heo 已提交
1342
		 */
T
Tejun Heo 已提交
1343
		if (rc == -EACCES || !unlock_hpa) {
1344 1345
			ata_dev_warn(dev,
				     "HPA support seems broken, skipping HPA handling\n");
T
Tejun Heo 已提交
1346 1347 1348 1349 1350
			dev->horkage |= ATA_HORKAGE_BROKEN_HPA;

			/* we can continue if device aborted the command */
			if (rc == -EACCES)
				rc = 0;
A
Alan Cox 已提交
1351
		}
T
Tejun Heo 已提交
1352

T
Tejun Heo 已提交
1353 1354
		return rc;
	}
T
Tejun Heo 已提交
1355
	dev->n_native_sectors = native_sectors;
T
Tejun Heo 已提交
1356 1357

	/* nothing to do? */
T
Tejun Heo 已提交
1358
	if (native_sectors <= sectors || !unlock_hpa) {
T
Tejun Heo 已提交
1359 1360 1361 1362
		if (!print_info || native_sectors == sectors)
			return 0;

		if (native_sectors > sectors)
1363
			ata_dev_info(dev,
T
Tejun Heo 已提交
1364 1365 1366 1367
				"HPA detected: current %llu, native %llu\n",
				(unsigned long long)sectors,
				(unsigned long long)native_sectors);
		else if (native_sectors < sectors)
1368 1369
			ata_dev_warn(dev,
				"native sectors (%llu) is smaller than sectors (%llu)\n",
T
Tejun Heo 已提交
1370 1371 1372 1373 1374 1375 1376 1377 1378
				(unsigned long long)native_sectors,
				(unsigned long long)sectors);
		return 0;
	}

	/* let's unlock HPA */
	rc = ata_set_max_sectors(dev, native_sectors);
	if (rc == -EACCES) {
		/* if device aborted the command, skip HPA resizing */
1379 1380 1381 1382
		ata_dev_warn(dev,
			     "device aborted resize (%llu -> %llu), skipping HPA handling\n",
			     (unsigned long long)sectors,
			     (unsigned long long)native_sectors);
T
Tejun Heo 已提交
1383 1384 1385 1386 1387 1388 1389 1390
		dev->horkage |= ATA_HORKAGE_BROKEN_HPA;
		return 0;
	} else if (rc)
		return rc;

	/* re-read IDENTIFY data */
	rc = ata_dev_reread_id(dev, 0);
	if (rc) {
1391 1392
		ata_dev_err(dev,
			    "failed to re-read IDENTIFY data after HPA resizing\n");
T
Tejun Heo 已提交
1393 1394 1395 1396 1397
		return rc;
	}

	if (print_info) {
		u64 new_sectors = ata_id_n_sectors(dev->id);
1398
		ata_dev_info(dev,
T
Tejun Heo 已提交
1399 1400 1401 1402 1403 1404 1405
			"HPA unlocked: %llu -> %llu, native %llu\n",
			(unsigned long long)sectors,
			(unsigned long long)new_sectors,
			(unsigned long long)native_sectors);
	}

	return 0;
A
Alan Cox 已提交
1406 1407
}

L
Linus Torvalds 已提交
1408 1409
/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1410
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
1411
 *
1412 1413
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
1414 1415 1416 1417 1418
 *
 *	LOCKING:
 *	caller.
 */

1419
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
1420 1421 1422 1423 1424 1425
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1426 1427 1428 1429 1430
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1431 1432 1433 1434 1435
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1436 1437 1438 1439 1440
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1441 1442
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1443 1444
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1445 1446
}

1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461
/**
 *	ata_id_xfermask - Compute xfermask from the given IDENTIFY data
 *	@id: IDENTIFY data to compute xfer mask from
 *
 *	Compute the xfermask for this device. This is not as trivial
 *	as it seems if we must consider early devices correctly.
 *
 *	FIXME: pre IDE drive timing (do we care ?).
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Computed xfermask
 */
1462
unsigned long ata_id_xfermask(const u16 *id)
1463
{
1464
	unsigned long pio_mask, mwdma_mask, udma_mask;
1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475

	/* Usual case. Word 53 indicates word 64 is valid */
	if (id[ATA_ID_FIELD_VALID] & (1 << 1)) {
		pio_mask = id[ATA_ID_PIO_MODES] & 0x03;
		pio_mask <<= 3;
		pio_mask |= 0x7;
	} else {
		/* If word 64 isn't valid then Word 51 high byte holds
		 * the PIO timing number for the maximum. Turn it into
		 * a mask.
		 */
1476
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1477
		if (mode < 5)	/* Valid PIO range */
1478
			pio_mask = (2 << mode) - 1;
1479 1480
		else
			pio_mask = 1;
1481 1482 1483 1484 1485 1486 1487 1488 1489 1490

		/* But wait.. there's more. Design your standards by
		 * committee and you too can get a free iordy field to
		 * process. However its the speeds not the modes that
		 * are supported... Note drivers using the timing API
		 * will get this right anyway
		 */
	}

	mwdma_mask = id[ATA_ID_MWDMA_MODES] & 0x07;
1491

1492 1493 1494 1495
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
S
Sergei Shtylyov 已提交
1496 1497
		int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
		int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508

		if (pio)
			pio_mask |= (1 << 5);
		if (pio > 1)
			pio_mask |= (1 << 6);
		if (dma)
			mwdma_mask |= (1 << 3);
		if (dma > 1)
			mwdma_mask |= (1 << 4);
	}

1509 1510 1511
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1512 1513 1514 1515

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

1516
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1517
{
1518
	struct completion *waiting = qc->private_data;
1519 1520 1521 1522 1523

	complete(waiting);
}

/**
1524
 *	ata_exec_internal_sg - execute libata internal command
1525 1526
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1527
 *	@cdb: CDB for packet command
1528
 *	@dma_dir: Data tranfer direction of the command
R
Randy Dunlap 已提交
1529
 *	@sgl: sg list for the data buffer of the command
1530
 *	@n_elem: Number of sg entries
1531
 *	@timeout: Timeout in msecs (0 for default)
1532 1533 1534 1535 1536 1537 1538 1539 1540
 *
 *	Executes libata internal command with timeout.  @tf contains
 *	command on entry and result on return.  Timeout and error
 *	conditions are reported via return value.  No recovery action
 *	is taken after a command times out.  It's caller's duty to
 *	clean up after timeout.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
1541 1542 1543
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1544
 */
1545 1546
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
J
Jens Axboe 已提交
1547
			      int dma_dir, struct scatterlist *sgl,
1548
			      unsigned int n_elem, unsigned long timeout)
1549
{
T
Tejun Heo 已提交
1550 1551
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1552
	u8 command = tf->command;
1553
	int auto_timeout = 0;
1554
	struct ata_queued_cmd *qc;
1555
	unsigned int tag, preempted_tag;
1556
	u32 preempted_sactive, preempted_qc_active;
1557
	int preempted_nr_active_links;
1558
	DECLARE_COMPLETION_ONSTACK(wait);
1559
	unsigned long flags;
1560
	unsigned int err_mask;
1561
	int rc;
1562

1563
	spin_lock_irqsave(ap->lock, flags);
1564

1565
	/* no internal command while frozen */
1566
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1567
		spin_unlock_irqrestore(ap->lock, flags);
1568 1569 1570
		return AC_ERR_SYSTEM;
	}

1571
	/* initialize internal qc */
1572

1573 1574 1575 1576 1577 1578 1579 1580 1581 1582
	/* XXX: Tag 0 is used for drivers with legacy EH as some
	 * drivers choke if any other tag is given.  This breaks
	 * ata_tag_internal() test for those drivers.  Don't use new
	 * EH stuff without converting to it.
	 */
	if (ap->ops->error_handler)
		tag = ATA_TAG_INTERNAL;
	else
		tag = 0;

1583 1584
	if (test_and_set_bit(tag, &ap->qc_allocated))
		BUG();
1585
	qc = __ata_qc_from_tag(ap, tag);
1586 1587 1588 1589 1590 1591 1592

	qc->tag = tag;
	qc->scsicmd = NULL;
	qc->ap = ap;
	qc->dev = dev;
	ata_qc_reinit(qc);

T
Tejun Heo 已提交
1593 1594
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1595
	preempted_qc_active = ap->qc_active;
1596
	preempted_nr_active_links = ap->nr_active_links;
T
Tejun Heo 已提交
1597 1598
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1599
	ap->qc_active = 0;
1600
	ap->nr_active_links = 0;
1601 1602

	/* prepare & issue qc */
1603
	qc->tf = *tf;
1604 1605
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1606
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1607 1608
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1609
		unsigned int i, buflen = 0;
J
Jens Axboe 已提交
1610
		struct scatterlist *sg;
1611

J
Jens Axboe 已提交
1612 1613
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1614

J
Jens Axboe 已提交
1615
		ata_sg_init(qc, sgl, n_elem);
1616
		qc->nbytes = buflen;
1617 1618
	}

1619
	qc->private_data = &wait;
1620 1621
	qc->complete_fn = ata_qc_complete_internal;

1622
	ata_qc_issue(qc);
1623

1624
	spin_unlock_irqrestore(ap->lock, flags);
1625

1626 1627 1628 1629 1630 1631 1632 1633
	if (!timeout) {
		if (ata_probe_timeout)
			timeout = ata_probe_timeout * 1000;
		else {
			timeout = ata_internal_cmd_timeout(dev, command);
			auto_timeout = 1;
		}
	}
1634

1635 1636 1637
	if (ap->ops->error_handler)
		ata_eh_release(ap);

1638
	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1639

1640 1641 1642
	if (ap->ops->error_handler)
		ata_eh_acquire(ap);

1643
	ata_sff_flush_pio_task(ap);
1644

1645
	if (!rc) {
1646
		spin_lock_irqsave(ap->lock, flags);
1647 1648 1649

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1650 1651
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1652
		 */
1653
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1654 1655 1656 1657 1658 1659
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1660

1661
			if (ata_msg_warn(ap))
1662 1663
				ata_dev_warn(dev, "qc timeout (cmd 0x%x)\n",
					     command);
1664 1665
		}

1666
		spin_unlock_irqrestore(ap->lock, flags);
1667 1668
	}

1669 1670 1671 1672
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1673 1674 1675 1676 1677 1678 1679 1680 1681 1682
	/* perform minimal error analysis */
	if (qc->flags & ATA_QCFLAG_FAILED) {
		if (qc->result_tf.command & (ATA_ERR | ATA_DF))
			qc->err_mask |= AC_ERR_DEV;

		if (!qc->err_mask)
			qc->err_mask |= AC_ERR_OTHER;

		if (qc->err_mask & ~AC_ERR_OTHER)
			qc->err_mask &= ~AC_ERR_OTHER;
1683 1684
	}

1685
	/* finish up */
1686
	spin_lock_irqsave(ap->lock, flags);
1687

1688
	*tf = qc->result_tf;
1689 1690 1691
	err_mask = qc->err_mask;

	ata_qc_free(qc);
T
Tejun Heo 已提交
1692 1693
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1694
	ap->qc_active = preempted_qc_active;
1695
	ap->nr_active_links = preempted_nr_active_links;
1696

1697
	spin_unlock_irqrestore(ap->lock, flags);
1698

1699 1700 1701
	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
		ata_internal_cmd_timed_out(dev, command);

1702
	return err_mask;
1703 1704
}

1705
/**
1706
 *	ata_exec_internal - execute libata internal command
1707 1708 1709 1710 1711 1712
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@cdb: CDB for packet command
 *	@dma_dir: Data tranfer direction of the command
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
1713
 *	@timeout: Timeout in msecs (0 for default)
1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
 *
 *	Wrapper around ata_exec_internal_sg() which takes simple
 *	buffer instead of sg list.
 *
 *	LOCKING:
 *	None.  Should be called with kernel context, might sleep.
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
 */
unsigned ata_exec_internal(struct ata_device *dev,
			   struct ata_taskfile *tf, const u8 *cdb,
1726 1727
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1728
{
1729 1730
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1731

1732 1733 1734 1735 1736 1737
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1738

1739 1740
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1741 1742
}

1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755
/**
 *	ata_do_simple_cmd - execute simple internal command
 *	@dev: Device to which the command is sent
 *	@cmd: Opcode to execute
 *
 *	Execute a 'simple' command, that only consists of the opcode
 *	'cmd' itself, without filling any other registers
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1756
 */
1757
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1758 1759 1760 1761 1762 1763 1764 1765 1766
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

	tf.command = cmd;
	tf.flags |= ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;

1767
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1768 1769
}

1770 1771 1772 1773 1774 1775 1776 1777 1778
/**
 *	ata_pio_need_iordy	-	check if iordy needed
 *	@adev: ATA device
 *
 *	Check if the current speed of the device requires IORDY. Used
 *	by various controllers for chip configuration.
 */
unsigned int ata_pio_need_iordy(const struct ata_device *adev)
{
T
Tejun Heo 已提交
1779 1780 1781 1782 1783 1784 1785 1786 1787
	/* Don't set IORDY if we're preparing for reset.  IORDY may
	 * lead to controller lock up on certain controllers if the
	 * port is not occupied.  See bko#11703 for details.
	 */
	if (adev->link->ap->pflags & ATA_PFLAG_RESETTING)
		return 0;
	/* Controller doesn't support IORDY.  Probably a pointless
	 * check as the caller should know this.
	 */
T
Tejun Heo 已提交
1788
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1789
		return 0;
1790 1791 1792 1793
	/* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6.  */
	if (ata_id_is_cfa(adev->id)
	    && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
		return 0;
A
Alan Cox 已提交
1794 1795 1796 1797 1798
	/* PIO3 and higher it is mandatory */
	if (adev->pio_mode > XFER_PIO_2)
		return 1;
	/* We turn it on when possible */
	if (ata_id_has_iordy(adev->id))
1799
		return 1;
A
Alan Cox 已提交
1800 1801
	return 0;
}
1802

A
Alan Cox 已提交
1803 1804 1805 1806 1807 1808 1809 1810 1811
/**
 *	ata_pio_mask_no_iordy	-	Return the non IORDY mask
 *	@adev: ATA device
 *
 *	Compute the highest mode possible if we are not using iordy. Return
 *	-1 if no iordy mode is available.
 */
static u32 ata_pio_mask_no_iordy(const struct ata_device *adev)
{
1812 1813
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
A
Alan Cox 已提交
1814
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1815 1816 1817 1818
		/* Is the speed faster than the drive allows non IORDY ? */
		if (pio) {
			/* This is cycle times not frequency - watch the logic! */
			if (pio > 240)	/* PIO2 is 240nS per cycle */
A
Alan Cox 已提交
1819 1820
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1821 1822
		}
	}
A
Alan Cox 已提交
1823
	return 3 << ATA_SHIFT_PIO;
1824 1825
}

1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
/**
 *	ata_do_dev_read_id		-	default ID read method
 *	@dev: device
 *	@tf: proposed taskfile
 *	@id: data buffer
 *
 *	Issue the identify taskfile and hand back the buffer containing
 *	identify data. For some RAID controllers and for pre ATA devices
 *	this function is wrapped or replaced by the driver
 */
unsigned int ata_do_dev_read_id(struct ata_device *dev,
					struct ata_taskfile *tf, u16 *id)
{
	return ata_exec_internal(dev, tf, NULL, DMA_FROM_DEVICE,
				     id, sizeof(id[0]) * ATA_ID_WORDS, 0);
}

L
Linus Torvalds 已提交
1843
/**
1844 1845 1846
 *	ata_dev_read_id - Read ID data from the specified device
 *	@dev: target device
 *	@p_class: pointer to class of the target device (may be changed)
1847
 *	@flags: ATA_READID_* flags
1848
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1849
 *
1850 1851
 *	Read ID data from the specified device.  ATA_CMD_ID_ATA is
 *	performed on ATA devices and ATA_CMD_ID_ATAPI on ATAPI
T
Tejun Heo 已提交
1852 1853
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1854
 *
1855
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1856
 *	now we abort if we hit that case.
1857
 *
L
Linus Torvalds 已提交
1858
 *	LOCKING:
1859 1860 1861 1862
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1863
 */
1864
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1865
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1866
{
T
Tejun Heo 已提交
1867
	struct ata_port *ap = dev->link->ap;
1868
	unsigned int class = *p_class;
1869
	struct ata_taskfile tf;
1870 1871
	unsigned int err_mask = 0;
	const char *reason;
T
Tejun Heo 已提交
1872
	bool is_semb = class == ATA_DEV_SEMB;
1873
	int may_fallback = 1, tried_spinup = 0;
1874
	int rc;
L
Linus Torvalds 已提交
1875

1876
	if (ata_msg_ctl(ap))
1877
		ata_dev_dbg(dev, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
1878

1879
retry:
T
Tejun Heo 已提交
1880
	ata_tf_init(dev, &tf);
1881

1882
	switch (class) {
T
Tejun Heo 已提交
1883 1884
	case ATA_DEV_SEMB:
		class = ATA_DEV_ATA;	/* some hard drives report SEMB sig */
1885
	case ATA_DEV_ATA:
1886
		tf.command = ATA_CMD_ID_ATA;
1887 1888
		break;
	case ATA_DEV_ATAPI:
1889
		tf.command = ATA_CMD_ID_ATAPI;
1890 1891 1892 1893 1894
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1895 1896
	}

1897
	tf.protocol = ATA_PROT_PIO;
T
Tejun Heo 已提交
1898 1899 1900 1901 1902 1903 1904 1905 1906 1907

	/* Some devices choke if TF registers contain garbage.  Make
	 * sure those are properly initialized.
	 */
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;

	/* Device presence detection is unreliable on some
	 * controllers.  Always poll IDENTIFY if available.
	 */
	tf.flags |= ATA_TFLAG_POLLING;
L
Linus Torvalds 已提交
1908

1909 1910 1911 1912 1913
	if (ap->ops->read_id)
		err_mask = ap->ops->read_id(dev, &tf, id);
	else
		err_mask = ata_do_dev_read_id(dev, &tf, id);

1914
	if (err_mask) {
1915
		if (err_mask & AC_ERR_NODEV_HINT) {
1916
			ata_dev_dbg(dev, "NODEV after polling detection\n");
1917 1918 1919
			return -ENOENT;
		}

T
Tejun Heo 已提交
1920
		if (is_semb) {
1921 1922
			ata_dev_info(dev,
		     "IDENTIFY failed on device w/ SEMB sig, disabled\n");
T
Tejun Heo 已提交
1923 1924 1925 1926 1927
			/* SEMB is not supported yet */
			*p_class = ATA_DEV_SEMB_UNSUP;
			return 0;
		}

1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947
		if ((err_mask == AC_ERR_DEV) && (tf.feature & ATA_ABORTED)) {
			/* Device or controller might have reported
			 * the wrong device class.  Give a shot at the
			 * other IDENTIFY if the current one is
			 * aborted by the device.
			 */
			if (may_fallback) {
				may_fallback = 0;

				if (class == ATA_DEV_ATA)
					class = ATA_DEV_ATAPI;
				else
					class = ATA_DEV_ATA;
				goto retry;
			}

			/* Control reaches here iff the device aborted
			 * both flavors of IDENTIFYs which happens
			 * sometimes with phantom devices.
			 */
1948 1949
			ata_dev_dbg(dev,
				    "both IDENTIFYs aborted, assuming NODEV\n");
1950
			return -ENOENT;
1951 1952
		}

1953 1954
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1955 1956 1957
		goto err_out;
	}

1958
	if (dev->horkage & ATA_HORKAGE_DUMP_ID) {
1959 1960 1961
		ata_dev_dbg(dev, "dumping IDENTIFY data, "
			    "class=%d may_fallback=%d tried_spinup=%d\n",
			    class, may_fallback, tried_spinup);
1962 1963 1964 1965
		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
			       16, 2, id, ATA_ID_WORDS * sizeof(*id), true);
	}

1966 1967 1968 1969 1970
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1971
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1972

1973
	/* sanity check */
1974
	rc = -EINVAL;
A
Alan Cox 已提交
1975
	reason = "device reports invalid type";
1976 1977 1978 1979

	if (class == ATA_DEV_ATA) {
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
1980 1981 1982 1983 1984 1985
		if (ap->host->flags & ATA_HOST_IGNORE_ATA &&
							ata_id_is_ata(id)) {
			ata_dev_dbg(dev,
				"host indicates ignore ATA devices, ignored\n");
			return -ENOENT;
		}
1986 1987 1988
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
1989 1990
	}

1991 1992 1993 1994 1995 1996 1997
	if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) {
		tried_spinup = 1;
		/*
		 * Drive powered-up in standby mode, and requires a specific
		 * SET_FEATURES spin-up subcommand before it will accept
		 * anything other than the original IDENTIFY command.
		 */
1998
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
1999
		if (err_mask && id[2] != 0x738c) {
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
			rc = -EIO;
			reason = "SPINUP failed";
			goto err_out;
		}
		/*
		 * If the drive initially returned incomplete IDENTIFY info,
		 * we now must reissue the IDENTIFY command.
		 */
		if (id[2] == 0x37c8)
			goto retry;
	}

2012
	if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) {
2013 2014 2015
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2016 2017
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2018 2019
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2020 2021
		 *
		 * Note that ATA4 says lba is mandatory so the second check
2022
		 * should never trigger.
2023 2024
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2025
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2026 2027 2028 2029 2030 2031 2032 2033 2034
			if (err_mask) {
				rc = -EIO;
				reason = "INIT_DEV_PARAMS failed";
				goto err_out;
			}

			/* current CHS translation info (id[53-58]) might be
			 * changed. reread the identify device info.
			 */
2035
			flags &= ~ATA_READID_POSTRESET;
2036 2037 2038 2039 2040
			goto retry;
		}
	}

	*p_class = class;
2041

2042 2043 2044
	return 0;

 err_out:
T
Tejun Heo 已提交
2045
	if (ata_msg_warn(ap))
2046 2047
		ata_dev_warn(dev, "failed to IDENTIFY (%s, err_mask=0x%x)\n",
			     reason, err_mask);
2048 2049 2050
	return rc;
}

2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076
static int ata_do_link_spd_horkage(struct ata_device *dev)
{
	struct ata_link *plink = ata_dev_phys_link(dev);
	u32 target, target_limit;

	if (!sata_scr_valid(plink))
		return 0;

	if (dev->horkage & ATA_HORKAGE_1_5_GBPS)
		target = 1;
	else
		return 0;

	target_limit = (1 << target) - 1;

	/* if already on stricter limit, no need to push further */
	if (plink->sata_spd_limit <= target_limit)
		return 0;

	plink->sata_spd_limit = target_limit;

	/* Request another EH round by returning -EAGAIN if link is
	 * going faster than the target speed.  Forward progress is
	 * guaranteed by setting sata_spd_limit to target_limit above.
	 */
	if (plink->sata_spd > target) {
2077 2078
		ata_dev_info(dev, "applying link speed limit horkage to %s\n",
			     sata_spd_string(target));
2079 2080 2081 2082 2083
		return -EAGAIN;
	}
	return 0;
}

T
Tejun Heo 已提交
2084
static inline u8 ata_dev_knobble(struct ata_device *dev)
2085
{
T
Tejun Heo 已提交
2086
	struct ata_port *ap = dev->link->ap;
2087 2088 2089 2090

	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
		return 0;

T
Tejun Heo 已提交
2091
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2092 2093
}

2094
static int ata_dev_config_ncq(struct ata_device *dev,
2095 2096
			       char *desc, size_t desc_sz)
{
T
Tejun Heo 已提交
2097
	struct ata_port *ap = dev->link->ap;
2098
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2099 2100
	unsigned int err_mask;
	char *aa_desc = "";
2101 2102 2103

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
2104
		return 0;
2105
	}
T
Tejun Heo 已提交
2106
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2107
		snprintf(desc, desc_sz, "NCQ (not used)");
2108
		return 0;
2109
	}
2110
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2111
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2112 2113 2114
		dev->flags |= ATA_DFLAG_NCQ;
	}

2115 2116 2117 2118 2119 2120
	if (!(dev->horkage & ATA_HORKAGE_BROKEN_FPDMA_AA) &&
		(ap->flags & ATA_FLAG_FPDMA_AA) &&
		ata_id_has_fpdma_aa(dev->id)) {
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SATA_ENABLE,
			SATA_FPDMA_AA);
		if (err_mask) {
2121 2122 2123
			ata_dev_err(dev,
				    "failed to enable AA (error_mask=0x%x)\n",
				    err_mask);
2124 2125 2126 2127 2128 2129 2130 2131
			if (err_mask != AC_ERR_DEV) {
				dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
				return -EIO;
			}
		} else
			aa_desc = ", AA";
	}

2132
	if (hdepth >= ddepth)
2133
		snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2134
	else
2135 2136 2137
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
			ddepth, aa_desc);
	return 0;
2138 2139
}

2140
/**
2141 2142 2143 2144 2145
 *	ata_dev_configure - Configure the specified ATA/ATAPI device
 *	@dev: Target device to configure
 *
 *	Configure @dev according to @dev->id.  Generic and low-level
 *	driver specific fixups are also applied.
2146 2147
 *
 *	LOCKING:
2148 2149 2150 2151
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2152
 */
2153
int ata_dev_configure(struct ata_device *dev)
2154
{
T
Tejun Heo 已提交
2155 2156
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
T
Tejun Heo 已提交
2157
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2158
	const u16 *id = dev->id;
2159
	unsigned long xfer_mask;
2160
	unsigned int err_mask;
2161
	char revbuf[7];		/* XYZ-99\0 */
2162 2163
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2164
	int rc;
2165

2166
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2167
		ata_dev_info(dev, "%s: ENTER/EXIT -- nodev\n", __func__);
2168
		return 0;
2169 2170
	}

2171
	if (ata_msg_probe(ap))
2172
		ata_dev_dbg(dev, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2173

T
Tejun Heo 已提交
2174 2175
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2176
	ata_force_horkage(dev);
T
Tejun Heo 已提交
2177

2178
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
2179
		ata_dev_info(dev, "unsupported device, disabling\n");
2180 2181 2182 2183
		ata_dev_disable(dev);
		return 0;
	}

2184 2185
	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
	    dev->class == ATA_DEV_ATAPI) {
2186 2187 2188
		ata_dev_warn(dev, "WARNING: ATAPI is %s, device ignored\n",
			     atapi_enabled ? "not supported with this driver"
			     : "disabled");
2189 2190 2191 2192
		ata_dev_disable(dev);
		return 0;
	}

2193 2194 2195 2196
	rc = ata_do_link_spd_horkage(dev);
	if (rc)
		return rc;

T
Tejun Heo 已提交
2197 2198 2199 2200
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2201

T
Tejun Heo 已提交
2202 2203 2204 2205 2206
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2207
	/* print device capabilities */
2208
	if (ata_msg_probe(ap))
2209 2210 2211 2212 2213 2214
		ata_dev_dbg(dev,
			    "%s: cfg 49:%04x 82:%04x 83:%04x 84:%04x "
			    "85:%04x 86:%04x 87:%04x 88:%04x\n",
			    __func__,
			    id[49], id[82], id[83], id[84],
			    id[85], id[86], id[87], id[88]);
2215

2216
	/* initialize to-be-configured parameters */
2217
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2218 2219 2220 2221 2222 2223
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;
2224
	dev->multi_count = 0;
2225

L
Linus Torvalds 已提交
2226 2227 2228 2229
	/*
	 * common ATA, ATAPI feature tests
	 */

2230
	/* find max transfer mode; for printk only */
2231
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2232

2233 2234
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2235

2236 2237 2238 2239 2240 2241 2242
	/* SCSI only uses 4-char revisions, dump full 8 chars from ATA */
	ata_id_c_string(dev->id, fwrevbuf, ATA_ID_FW_REV,
			sizeof(fwrevbuf));

	ata_id_c_string(dev->id, modelbuf, ATA_ID_PROD,
			sizeof(modelbuf));

L
Linus Torvalds 已提交
2243 2244
	/* ATA-specific feature tests */
	if (dev->class == ATA_DEV_ATA) {
2245
		if (ata_id_is_cfa(id)) {
S
Sergei Shtylyov 已提交
2246 2247
			/* CPRM may make this media unusable */
			if (id[ATA_ID_CFA_KEY_MGMT] & 1)
2248 2249
				ata_dev_warn(dev,
	"supports DRM functions and may not be fully accessible\n");
2250
			snprintf(revbuf, 7, "CFA");
2251
		} else {
2252
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2253 2254
			/* Warn the user if the device has TPM extensions */
			if (ata_id_has_tpm(id))
2255 2256
				ata_dev_warn(dev,
	"supports DRM functions and may not be fully accessible\n");
2257
		}
2258

2259
		dev->n_sectors = ata_id_n_sectors(id);
2260

2261 2262 2263 2264 2265 2266 2267 2268 2269
		/* get current R/W Multiple count setting */
		if ((dev->id[47] >> 8) == 0x80 && (dev->id[59] & 0x100)) {
			unsigned int max = dev->id[47] & 0xff;
			unsigned int cnt = dev->id[59] & 0xff;
			/* only recognize/allow powers of two here */
			if (is_power_of_2(max) && is_power_of_2(cnt))
				if (cnt <= max)
					dev->multi_count = cnt;
		}
2270

2271
		if (ata_id_has_lba(id)) {
2272
			const char *lba_desc;
2273
			char ncq_desc[24];
2274

2275 2276
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2277
			if (ata_id_has_lba48(id)) {
2278
				dev->flags |= ATA_DFLAG_LBA48;
2279
				lba_desc = "LBA48";
2280 2281 2282 2283

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2284
			}
2285

2286
			/* config NCQ */
2287 2288 2289
			rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
			if (rc)
				return rc;
2290

2291
			/* print device info to dmesg */
2292
			if (ata_msg_drv(ap) && print_info) {
2293 2294 2295 2296 2297
				ata_dev_info(dev, "%s: %s, %s, max %s\n",
					     revbuf, modelbuf, fwrevbuf,
					     ata_mode_string(xfer_mask));
				ata_dev_info(dev,
					     "%llu sectors, multi %u: %s %s\n",
2298
					(unsigned long long)dev->n_sectors,
2299 2300
					dev->multi_count, lba_desc, ncq_desc);
			}
2301
		} else {
2302 2303 2304
			/* CHS */

			/* Default translation */
2305 2306 2307
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2308

2309
			if (ata_id_current_chs_valid(id)) {
2310
				/* Current CHS translation is valid. */
2311 2312 2313
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2314 2315 2316
			}

			/* print device info to dmesg */
2317
			if (ata_msg_drv(ap) && print_info) {
2318 2319 2320 2321 2322 2323 2324 2325
				ata_dev_info(dev, "%s: %s, %s, max %s\n",
					     revbuf,	modelbuf, fwrevbuf,
					     ata_mode_string(xfer_mask));
				ata_dev_info(dev,
					     "%llu sectors, multi %u, CHS %u/%u/%u\n",
					     (unsigned long long)dev->n_sectors,
					     dev->multi_count, dev->cylinders,
					     dev->heads, dev->sectors);
2326
			}
2327 2328
		}

2329 2330
		/* Check and mark DevSlp capability. Get DevSlp timing variables
		 * from SATA Settings page of Identify Device Data Log.
2331
		 */
2332 2333 2334 2335 2336
		if (ata_id_has_devslp(dev->id)) {
			u8 sata_setting[ATA_SECT_SIZE];
			int i, j;

			dev->flags |= ATA_DFLAG_DEVSLP;
2337 2338 2339
			err_mask = ata_read_log_page(dev,
						     ATA_LOG_SATA_ID_DEV_DATA,
						     ATA_LOG_SATA_SETTINGS,
2340
						     sata_setting,
2341 2342 2343 2344 2345
						     1);
			if (err_mask)
				ata_dev_dbg(dev,
					    "failed to get Identify Device Data, Emask 0x%x\n",
					    err_mask);
2346 2347 2348 2349 2350
			else
				for (i = 0; i < ATA_LOG_DEVSLP_SIZE; i++) {
					j = ATA_LOG_DEVSLP_OFFSET + i;
					dev->devslp_timing[i] = sata_setting[j];
				}
2351 2352
		}

2353
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2354 2355 2356
	}

	/* ATAPI-specific feature tests */
J
Jeff Garzik 已提交
2357
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2358 2359
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2360
		const char *dma_dir_string = "";
2361
		u32 sntf;
2362

2363
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2364
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2365
			if (ata_msg_warn(ap))
2366
				ata_dev_warn(dev, "unsupported CDB len\n");
2367
			rc = -EINVAL;
L
Linus Torvalds 已提交
2368 2369
			goto err_out_nosup;
		}
2370
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2371

2372 2373 2374 2375
		/* Enable ATAPI AN if both the host and device have
		 * the support.  If PMP is attached, SNTF is required
		 * to enable ATAPI AN to discern between PHY status
		 * changed notifications and ATAPI ANs.
2376
		 */
T
Tejun Heo 已提交
2377 2378
		if (atapi_an &&
		    (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2379
		    (!sata_pmp_attached(ap) ||
2380
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2381
			/* issue SET feature command to turn this on */
2382 2383
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2384
			if (err_mask)
2385 2386 2387
				ata_dev_err(dev,
					    "failed to enable ATAPI AN (err_mask=0x%x)\n",
					    err_mask);
T
Tejun Heo 已提交
2388
			else {
2389
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2390 2391
				atapi_an_string = ", ATAPI AN";
			}
2392 2393
		}

2394
		if (ata_id_cdb_intr(dev->id)) {
2395
			dev->flags |= ATA_DFLAG_CDB_INTR;
2396 2397
			cdb_intr_string = ", CDB intr";
		}
2398

2399 2400 2401 2402 2403
		if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

2404 2405 2406
		if (ata_id_has_da(dev->id))
			dev->flags |= ATA_DFLAG_DA;

L
Linus Torvalds 已提交
2407
		/* print device info to dmesg */
2408
		if (ata_msg_drv(ap) && print_info)
2409 2410 2411 2412 2413 2414
			ata_dev_info(dev,
				     "ATAPI: %s, %s, max %s%s%s%s\n",
				     modelbuf, fwrevbuf,
				     ata_mode_string(xfer_mask),
				     cdb_intr_string, atapi_an_string,
				     dma_dir_string);
L
Linus Torvalds 已提交
2415 2416
	}

2417 2418 2419 2420 2421
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2422 2423
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2424
	if (ata_dev_knobble(dev)) {
2425
		if (ata_msg_drv(ap) && print_info)
2426
			ata_dev_info(dev, "applying bridge limits\n");
2427
		dev->udma_mask &= ATA_UDMA5;
2428 2429 2430
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2431
	if ((dev->class == ATA_DEV_ATAPI) &&
2432
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2433
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2434 2435
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2436

T
Tejun Heo 已提交
2437
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2438 2439
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2440

2441
	if (ap->ops->dev_config)
2442
		ap->ops->dev_config(dev);
2443

2444 2445 2446 2447 2448 2449 2450 2451
	if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
		/* Let the user know. We don't want to disallow opens for
		   rescue purposes, or in case the vendor is just a blithering
		   idiot. Do this after the dev_config call as some controllers
		   with buggy firmware may want to avoid reporting false device
		   bugs */

		if (print_info) {
2452
			ata_dev_warn(dev,
2453
"Drive reports diagnostics failure. This may indicate a drive\n");
2454
			ata_dev_warn(dev,
2455 2456 2457 2458
"fault or invalid emulation. Contact drive vendor for information.\n");
		}
	}

2459
	if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2460 2461
		ata_dev_warn(dev, "WARNING: device requires firmware update to be fully functional\n");
		ata_dev_warn(dev, "         contact the vendor or visit http://ata.wiki.kernel.org\n");
2462 2463
	}

2464
	return 0;
L
Linus Torvalds 已提交
2465 2466

err_out_nosup:
2467
	if (ata_msg_probe(ap))
2468
		ata_dev_dbg(dev, "%s: EXIT, err\n", __func__);
2469
	return rc;
L
Linus Torvalds 已提交
2470 2471
}

A
Alan Cox 已提交
2472
/**
2473
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2474 2475
 *	@ap: port
 *
2476
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2477 2478 2479 2480 2481 2482 2483 2484 2485
 *	detection.
 */

int ata_cable_40wire(struct ata_port *ap)
{
	return ATA_CBL_PATA40;
}

/**
2486
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2487 2488
 *	@ap: port
 *
2489
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509
 *	detection.
 */

int ata_cable_80wire(struct ata_port *ap)
{
	return ATA_CBL_PATA80;
}

/**
 *	ata_cable_unknown	-	return unknown PATA cable.
 *	@ap: port
 *
 *	Helper method for drivers which have no PATA cable detection.
 */

int ata_cable_unknown(struct ata_port *ap)
{
	return ATA_CBL_PATA_UNK;
}

T
Tejun Heo 已提交
2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521
/**
 *	ata_cable_ignore	-	return ignored PATA cable.
 *	@ap: port
 *
 *	Helper method for drivers which don't use cable type to limit
 *	transfer mode.
 */
int ata_cable_ignore(struct ata_port *ap)
{
	return ATA_CBL_PATA_IGN;
}

A
Alan Cox 已提交
2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533
/**
 *	ata_cable_sata	-	return SATA cable type
 *	@ap: port
 *
 *	Helper method for drivers which have SATA cables
 */

int ata_cable_sata(struct ata_port *ap)
{
	return ATA_CBL_SATA;
}

L
Linus Torvalds 已提交
2534 2535 2536 2537
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2538 2539 2540 2541
 *	Master ATA bus probing function.  Initiates a hardware-dependent
 *	bus reset, then attempts to identify any devices found on
 *	the bus.
 *
L
Linus Torvalds 已提交
2542
 *	LOCKING:
J
Jeff Garzik 已提交
2543
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2544 2545
 *
 *	RETURNS:
2546
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2547 2548
 */

2549
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2550
{
2551
	unsigned int classes[ATA_MAX_DEVICES];
2552
	int tries[ATA_MAX_DEVICES];
2553
	int rc;
2554
	struct ata_device *dev;
L
Linus Torvalds 已提交
2555

T
Tejun Heo 已提交
2556
	ata_for_each_dev(dev, &ap->link, ALL)
2557
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2558 2559

 retry:
T
Tejun Heo 已提交
2560
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2561 2562 2563 2564 2565 2566 2567 2568
		/* If we issue an SRST then an ATA drive (not ATAPI)
		 * may change configuration and be in PIO0 timing. If
		 * we do a hard reset (or are coming from power on)
		 * this is true for ATA or ATAPI. Until we've set a
		 * suitable controller mode we should not touch the
		 * bus as we may be talking too fast.
		 */
		dev->pio_mode = XFER_PIO_0;
A
Aaron Lu 已提交
2569
		dev->dma_mode = 0xff;
T
Tejun Heo 已提交
2570 2571 2572 2573 2574 2575 2576 2577 2578 2579

		/* If the controller has a pio mode setup function
		 * then use it to set the chipset to rights. Don't
		 * touch the DMA setup as that will be dealt with when
		 * configuring devices.
		 */
		if (ap->ops->set_piomode)
			ap->ops->set_piomode(ap, dev);
	}

2580
	/* reset and determine device classes */
2581
	ap->ops->phy_reset(ap);
2582

T
Tejun Heo 已提交
2583
	ata_for_each_dev(dev, &ap->link, ALL) {
T
Tejun Heo 已提交
2584
		if (dev->class != ATA_DEV_UNKNOWN)
2585 2586 2587
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2588

2589
		dev->class = ATA_DEV_UNKNOWN;
2590
	}
L
Linus Torvalds 已提交
2591

2592 2593 2594 2595
	/* read IDENTIFY page and configure devices. We have to do the identify
	   specific sequence bass-ackwards so that PDIAG- is released by
	   the slave device */

T
Tejun Heo 已提交
2596
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2597 2598
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2599

2600
		if (!ata_dev_enabled(dev))
2601 2602
			continue;

2603 2604
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2605 2606
		if (rc)
			goto fail;
2607 2608
	}

A
Alan Cox 已提交
2609 2610 2611 2612
	/* Now ask for the cable type as PDIAG- should have been released */
	if (ap->ops->cable_detect)
		ap->cbl = ap->ops->cable_detect(ap);

T
Tejun Heo 已提交
2613 2614 2615 2616 2617 2618
	/* We may have SATA bridge glue hiding here irrespective of
	 * the reported cable types and sensed types.  When SATA
	 * drives indicate we have a bridge, we don't know which end
	 * of the link the bridge is which is a problem.
	 */
	ata_for_each_dev(dev, &ap->link, ENABLED)
A
Alan Cox 已提交
2619 2620 2621
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2622 2623 2624
	/* After the identify sequence we can now set up the devices. We do
	   this in the normal order so that the user doesn't get confused */

T
Tejun Heo 已提交
2625
	ata_for_each_dev(dev, &ap->link, ENABLED) {
T
Tejun Heo 已提交
2626
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2627
		rc = ata_dev_configure(dev);
T
Tejun Heo 已提交
2628
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2629 2630
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2631 2632
	}

2633
	/* configure transfer mode */
2634
	rc = ata_set_mode(&ap->link, &dev);
2635
	if (rc)
2636
		goto fail;
L
Linus Torvalds 已提交
2637

T
Tejun Heo 已提交
2638 2639
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2640

2641
	return -ENODEV;
2642 2643

 fail:
2644 2645
	tries[dev->devno]--;

2646 2647
	switch (rc) {
	case -EINVAL:
2648
		/* eeek, something went very wrong, give up */
2649 2650
		tries[dev->devno] = 0;
		break;
2651 2652 2653 2654

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2655
	case -EIO:
2656 2657 2658 2659
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2660
			sata_down_spd_limit(&ap->link, 0);
2661 2662
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2663 2664
	}

2665
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2666
		ata_dev_disable(dev);
2667

2668
	goto retry;
L
Linus Torvalds 已提交
2669 2670
}

2671 2672
/**
 *	sata_print_link_status - Print SATA link status
2673
 *	@link: SATA link to printk link status about
2674 2675 2676 2677 2678 2679
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2680
static void sata_print_link_status(struct ata_link *link)
2681
{
2682
	u32 sstatus, scontrol, tmp;
2683

2684
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2685
		return;
2686
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2687

T
Tejun Heo 已提交
2688
	if (ata_phys_link_online(link)) {
2689
		tmp = (sstatus >> 4) & 0xf;
2690 2691
		ata_link_info(link, "SATA link up %s (SStatus %X SControl %X)\n",
			      sata_spd_string(tmp), sstatus, scontrol);
2692
	} else {
2693 2694
		ata_link_info(link, "SATA link down (SStatus %X SControl %X)\n",
			      sstatus, scontrol);
2695 2696 2697
	}
}

2698 2699 2700 2701 2702 2703 2704
/**
 *	ata_dev_pair		-	return other device on cable
 *	@adev: device
 *
 *	Obtain the other device on the same cable, or if none is
 *	present NULL is returned
 */
2705

T
Tejun Heo 已提交
2706
struct ata_device *ata_dev_pair(struct ata_device *adev)
2707
{
T
Tejun Heo 已提交
2708 2709
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2710
	if (!ata_dev_enabled(pair))
2711 2712 2713 2714
		return NULL;
	return pair;
}

2715
/**
2716
 *	sata_down_spd_limit - adjust SATA spd limit downward
2717
 *	@link: Link to adjust SATA spd limit for
2718
 *	@spd_limit: Additional limit
2719
 *
2720
 *	Adjust SATA spd limit of @link downward.  Note that this
2721
 *	function only adjusts the limit.  The change must be applied
2722
 *	using sata_set_spd().
2723
 *
2724 2725 2726 2727 2728
 *	If @spd_limit is non-zero, the speed is limited to equal to or
 *	lower than @spd_limit if such speed is supported.  If
 *	@spd_limit is slower than any supported speed, only the lowest
 *	supported speed is allowed.
 *
2729 2730 2731 2732 2733 2734
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2735
int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2736
{
2737
	u32 sstatus, spd, mask;
2738
	int rc, bit;
2739

2740
	if (!sata_scr_valid(link))
2741 2742 2743
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2744
	 * If not, use cached value in link->sata_spd.
2745
	 */
2746
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2747
	if (rc == 0 && ata_sstatus_online(sstatus))
2748 2749
		spd = (sstatus >> 4) & 0xf;
	else
2750
		spd = link->sata_spd;
2751

2752
	mask = link->sata_spd_limit;
2753 2754
	if (mask <= 1)
		return -EINVAL;
2755 2756

	/* unconditionally mask off the highest bit */
2757 2758
	bit = fls(mask) - 1;
	mask &= ~(1 << bit);
2759

2760 2761 2762 2763 2764 2765 2766 2767 2768
	/* Mask off all speeds higher than or equal to the current
	 * one.  Force 1.5Gbps if current SPD is not available.
	 */
	if (spd > 1)
		mask &= (1 << (spd - 1)) - 1;
	else
		mask &= 1;

	/* were we already at the bottom? */
2769 2770 2771
	if (!mask)
		return -EINVAL;

2772 2773 2774 2775 2776 2777 2778 2779 2780
	if (spd_limit) {
		if (mask & ((1 << spd_limit) - 1))
			mask &= (1 << spd_limit) - 1;
		else {
			bit = ffs(mask) - 1;
			mask = 1 << bit;
		}
	}

2781
	link->sata_spd_limit = mask;
2782

2783 2784
	ata_link_warn(link, "limiting SATA link speed to %s\n",
		      sata_spd_string(fls(mask)));
2785 2786 2787 2788

	return 0;
}

2789
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2790
{
2791 2792
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2793

2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804
	limit = link->sata_spd_limit;

	/* Don't configure downstream link faster than upstream link.
	 * It doesn't speed up anything and some PMPs choke on such
	 * configuration.
	 */
	if (!ata_is_host_link(link) && host_link->sata_spd)
		limit &= (1 << host_link->sata_spd) - 1;

	if (limit == UINT_MAX)
		target = 0;
2805
	else
2806
		target = fls(limit);
2807 2808

	spd = (*scontrol >> 4) & 0xf;
2809
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2810

2811
	return spd != target;
2812 2813 2814
}

/**
2815
 *	sata_set_spd_needed - is SATA spd configuration needed
2816
 *	@link: Link in question
2817 2818
 *
 *	Test whether the spd limit in SControl matches
2819
 *	@link->sata_spd_limit.  This function is used to determine
2820 2821 2822 2823 2824 2825 2826 2827 2828
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
A
Adrian Bunk 已提交
2829
static int sata_set_spd_needed(struct ata_link *link)
2830 2831 2832
{
	u32 scontrol;

2833
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2834
		return 1;
2835

2836
	return __sata_set_spd_needed(link, &scontrol);
2837 2838 2839
}

/**
2840
 *	sata_set_spd - set SATA spd according to spd limit
2841
 *	@link: Link to set SATA spd for
2842
 *
2843
 *	Set SATA spd of @link according to sata_spd_limit.
2844 2845 2846 2847 2848 2849
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2850
 *	changed.  Negative errno if SCR registers are inaccessible.
2851
 */
2852
int sata_set_spd(struct ata_link *link)
2853 2854
{
	u32 scontrol;
2855
	int rc;
2856

2857
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2858
		return rc;
2859

2860
	if (!__sata_set_spd_needed(link, &scontrol))
2861 2862
		return 0;

2863
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2864 2865
		return rc;

2866 2867 2868
	return 1;
}

A
Alan Cox 已提交
2869 2870 2871 2872 2873
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2874
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
A
Alan Cox 已提交
2875
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2876 2877 2878
 * for UDMA6, which is currently supported only by Maxtor drives.
 *
 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
A
Alan Cox 已提交
2879 2880 2881
 */

static const struct ata_timing ata_timing[] = {
2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908
/*	{ XFER_PIO_SLOW, 120, 290, 240, 960, 290, 240, 0,  960,   0 }, */
	{ XFER_PIO_0,     70, 290, 240, 600, 165, 150, 0,  600,   0 },
	{ XFER_PIO_1,     50, 290,  93, 383, 125, 100, 0,  383,   0 },
	{ XFER_PIO_2,     30, 290,  40, 330, 100,  90, 0,  240,   0 },
	{ XFER_PIO_3,     30,  80,  70, 180,  80,  70, 0,  180,   0 },
	{ XFER_PIO_4,     25,  70,  25, 120,  70,  25, 0,  120,   0 },
	{ XFER_PIO_5,     15,  65,  25, 100,  65,  25, 0,  100,   0 },
	{ XFER_PIO_6,     10,  55,  20,  80,  55,  20, 0,   80,   0 },

	{ XFER_SW_DMA_0, 120,   0,   0,   0, 480, 480, 50, 960,   0 },
	{ XFER_SW_DMA_1,  90,   0,   0,   0, 240, 240, 30, 480,   0 },
	{ XFER_SW_DMA_2,  60,   0,   0,   0, 120, 120, 20, 240,   0 },

	{ XFER_MW_DMA_0,  60,   0,   0,   0, 215, 215, 20, 480,   0 },
	{ XFER_MW_DMA_1,  45,   0,   0,   0,  80,  50, 5,  150,   0 },
	{ XFER_MW_DMA_2,  25,   0,   0,   0,  70,  25, 5,  120,   0 },
	{ XFER_MW_DMA_3,  25,   0,   0,   0,  65,  25, 5,  100,   0 },
	{ XFER_MW_DMA_4,  25,   0,   0,   0,  55,  20, 5,   80,   0 },

/*	{ XFER_UDMA_SLOW,  0,   0,   0,   0,   0,   0, 0,    0, 150 }, */
	{ XFER_UDMA_0,     0,   0,   0,   0,   0,   0, 0,    0, 120 },
	{ XFER_UDMA_1,     0,   0,   0,   0,   0,   0, 0,    0,  80 },
	{ XFER_UDMA_2,     0,   0,   0,   0,   0,   0, 0,    0,  60 },
	{ XFER_UDMA_3,     0,   0,   0,   0,   0,   0, 0,    0,  45 },
	{ XFER_UDMA_4,     0,   0,   0,   0,   0,   0, 0,    0,  30 },
	{ XFER_UDMA_5,     0,   0,   0,   0,   0,   0, 0,    0,  20 },
	{ XFER_UDMA_6,     0,   0,   0,   0,   0,   0, 0,    0,  15 },
A
Alan Cox 已提交
2909 2910 2911 2912

	{ 0xFF }
};

2913 2914
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
A
Alan Cox 已提交
2915 2916 2917

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
2918 2919 2920 2921 2922 2923 2924 2925 2926
	q->setup	= EZ(t->setup      * 1000,  T);
	q->act8b	= EZ(t->act8b      * 1000,  T);
	q->rec8b	= EZ(t->rec8b      * 1000,  T);
	q->cyc8b	= EZ(t->cyc8b      * 1000,  T);
	q->active	= EZ(t->active     * 1000,  T);
	q->recover	= EZ(t->recover    * 1000,  T);
	q->dmack_hold	= EZ(t->dmack_hold * 1000,  T);
	q->cycle	= EZ(t->cycle      * 1000,  T);
	q->udma		= EZ(t->udma       * 1000, UT);
A
Alan Cox 已提交
2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937
}

void ata_timing_merge(const struct ata_timing *a, const struct ata_timing *b,
		      struct ata_timing *m, unsigned int what)
{
	if (what & ATA_TIMING_SETUP  ) m->setup   = max(a->setup,   b->setup);
	if (what & ATA_TIMING_ACT8B  ) m->act8b   = max(a->act8b,   b->act8b);
	if (what & ATA_TIMING_REC8B  ) m->rec8b   = max(a->rec8b,   b->rec8b);
	if (what & ATA_TIMING_CYC8B  ) m->cyc8b   = max(a->cyc8b,   b->cyc8b);
	if (what & ATA_TIMING_ACTIVE ) m->active  = max(a->active,  b->active);
	if (what & ATA_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
2938
	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
A
Alan Cox 已提交
2939 2940 2941 2942
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

2943
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
A
Alan Cox 已提交
2944
{
2945 2946 2947 2948
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
A
Alan Cox 已提交
2949

2950 2951
	if (xfer_mode == t->mode)
		return t;
2952 2953 2954 2955

	WARN_ONCE(true, "%s: unable to find timing for xfer_mode 0x%x\n",
			__func__, xfer_mode);

2956
	return NULL;
A
Alan Cox 已提交
2957 2958 2959 2960 2961
}

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{
2962
	const u16 *id = adev->id;
A
Alan Cox 已提交
2963 2964 2965 2966
	const struct ata_timing *s;
	struct ata_timing p;

	/*
2967
	 * Find the mode.
2968
	 */
A
Alan Cox 已提交
2969 2970 2971 2972

	if (!(s = ata_timing_find_mode(speed)))
		return -EINVAL;

2973 2974
	memcpy(t, s, sizeof(*s));

A
Alan Cox 已提交
2975 2976 2977 2978 2979
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

2980
	if (id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
A
Alan Cox 已提交
2981
		memset(&p, 0, sizeof(p));
2982

2983
		if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {
2984 2985 2986 2987 2988 2989 2990 2991
			if (speed <= XFER_PIO_2)
				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO];
			else if ((speed <= XFER_PIO_4) ||
				 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))
				p.cycle = p.cyc8b = id[ATA_ID_EIDE_PIO_IORDY];
		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
			p.cycle = id[ATA_ID_EIDE_DMA_MIN];

A
Alan Cox 已提交
2992 2993 2994 2995 2996 2997 2998
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

	/*
	 * Convert the timing to bus clock counts.
	 */

2999
	ata_timing_quantize(t, t, T, UT);
A
Alan Cox 已提交
3000 3001

	/*
3002 3003 3004
	 * Even in DMA/UDMA modes we still use PIO access for IDENTIFY,
	 * S.M.A.R.T * and some other commands. We have to ensure that the
	 * DMA cycle timing is slower/equal than the fastest PIO timing.
A
Alan Cox 已提交
3005 3006
	 */

3007
	if (speed > XFER_PIO_6) {
A
Alan Cox 已提交
3008 3009 3010 3011 3012
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
3013
	 * Lengthen active & recovery time so that cycle time is correct.
A
Alan Cox 已提交
3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024
	 */

	if (t->act8b + t->rec8b < t->cyc8b) {
		t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;
		t->rec8b = t->cyc8b - t->act8b;
	}

	if (t->active + t->recover < t->cycle) {
		t->active += (t->cycle - (t->active + t->recover)) / 2;
		t->recover = t->cycle - t->active;
	}
J
Jeff Garzik 已提交
3025

3026 3027 3028 3029 3030
	/* In a few cases quantisation may produce enough errors to
	   leave t->cycle too low for the sum of active and recovery
	   if so we must correct this */
	if (t->active + t->recover > t->cycle)
		t->cycle = t->active + t->recover;
A
Alan Cox 已提交
3031 3032 3033 3034

	return 0;
}

3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085
/**
 *	ata_timing_cycle2mode - find xfer mode for the specified cycle duration
 *	@xfer_shift: ATA_SHIFT_* value for transfer type to examine.
 *	@cycle: cycle duration in ns
 *
 *	Return matching xfer mode for @cycle.  The returned mode is of
 *	the transfer type specified by @xfer_shift.  If @cycle is too
 *	slow for @xfer_shift, 0xff is returned.  If @cycle is faster
 *	than the fastest known mode, the fasted mode is returned.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	Matching xfer_mode, 0xff if no match found.
 */
u8 ata_timing_cycle2mode(unsigned int xfer_shift, int cycle)
{
	u8 base_mode = 0xff, last_mode = 0xff;
	const struct ata_xfer_ent *ent;
	const struct ata_timing *t;

	for (ent = ata_xfer_tbl; ent->shift >= 0; ent++)
		if (ent->shift == xfer_shift)
			base_mode = ent->base;

	for (t = ata_timing_find_mode(base_mode);
	     t && ata_xfer_mode2shift(t->mode) == xfer_shift; t++) {
		unsigned short this_cycle;

		switch (xfer_shift) {
		case ATA_SHIFT_PIO:
		case ATA_SHIFT_MWDMA:
			this_cycle = t->cycle;
			break;
		case ATA_SHIFT_UDMA:
			this_cycle = t->udma;
			break;
		default:
			return 0xff;
		}

		if (cycle > this_cycle)
			break;

		last_mode = t->mode;
	}

	return last_mode;
}

3086 3087 3088
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3089
 *	@sel: ATA_DNXFER_* selector
3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100
 *
 *	Adjust xfer masks of @dev downward.  Note that this function
 *	does not apply the change.  Invoking ata_set_mode() afterwards
 *	will apply the limit.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
3101
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3102
{
3103
	char buf[32];
3104 3105
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3106
	int quiet, highbit;
3107

3108 3109
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3110

3111 3112 3113 3114
	xfer_mask = orig_mask = ata_pack_xfermask(dev->pio_mask,
						  dev->mwdma_mask,
						  dev->udma_mask);
	ata_unpack_xfermask(xfer_mask, &pio_mask, &mwdma_mask, &udma_mask);
3115

3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164
	switch (sel) {
	case ATA_DNXFER_PIO:
		highbit = fls(pio_mask) - 1;
		pio_mask &= ~(1 << highbit);
		break;

	case ATA_DNXFER_DMA:
		if (udma_mask) {
			highbit = fls(udma_mask) - 1;
			udma_mask &= ~(1 << highbit);
			if (!udma_mask)
				return -ENOENT;
		} else if (mwdma_mask) {
			highbit = fls(mwdma_mask) - 1;
			mwdma_mask &= ~(1 << highbit);
			if (!mwdma_mask)
				return -ENOENT;
		}
		break;

	case ATA_DNXFER_40C:
		udma_mask &= ATA_UDMA_MASK_40C;
		break;

	case ATA_DNXFER_FORCE_PIO0:
		pio_mask &= 1;
	case ATA_DNXFER_FORCE_PIO:
		mwdma_mask = 0;
		udma_mask = 0;
		break;

	default:
		BUG();
	}

	xfer_mask &= ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);

	if (!(xfer_mask & ATA_MASK_PIO) || xfer_mask == orig_mask)
		return -ENOENT;

	if (!quiet) {
		if (xfer_mask & (ATA_MASK_MWDMA | ATA_MASK_UDMA))
			snprintf(buf, sizeof(buf), "%s:%s",
				 ata_mode_string(xfer_mask),
				 ata_mode_string(xfer_mask & ATA_MASK_PIO));
		else
			snprintf(buf, sizeof(buf), "%s",
				 ata_mode_string(xfer_mask));

3165
		ata_dev_warn(dev, "limiting speed to %s\n", buf);
3166
	}
3167 3168 3169 3170 3171 3172 3173

	ata_unpack_xfermask(xfer_mask, &dev->pio_mask, &dev->mwdma_mask,
			    &dev->udma_mask);

	return 0;
}

T
Tejun Heo 已提交
3174
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3175
{
3176
	struct ata_port *ap = dev->link->ap;
T
Tejun Heo 已提交
3177
	struct ata_eh_context *ehc = &dev->link->eh_context;
3178
	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3179 3180
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3181
	unsigned int err_mask = 0;
3182
	int rc;
L
Linus Torvalds 已提交
3183

3184
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3185 3186 3187
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

3188 3189 3190 3191
	if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
		dev_err_whine = " (SET_XFERMODE skipped)";
	else {
		if (nosetxfer)
3192 3193 3194
			ata_dev_warn(dev,
				     "NOSETXFER but PATA detected - can't "
				     "skip SETXFER, might malfunction\n");
3195 3196
		err_mask = ata_dev_set_xfermode(dev);
	}
3197

3198 3199 3200 3201 3202 3203 3204 3205 3206 3207
	if (err_mask & ~AC_ERR_DEV)
		goto fail;

	/* revalidate */
	ehc->i.flags |= ATA_EHI_POST_SETMODE;
	rc = ata_dev_revalidate(dev, ATA_DEV_UNKNOWN, 0);
	ehc->i.flags &= ~ATA_EHI_POST_SETMODE;
	if (rc)
		return rc;

3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222
	if (dev->xfer_shift == ATA_SHIFT_PIO) {
		/* Old CFA may refuse this command, which is just fine */
		if (ata_id_is_cfa(dev->id))
			ign_dev_err = 1;
		/* Catch several broken garbage emulations plus some pre
		   ATA devices */
		if (ata_id_major_version(dev->id) == 0 &&
					dev->pio_mode <= XFER_PIO_2)
			ign_dev_err = 1;
		/* Some very old devices and some bad newer ones fail
		   any kind of SET_XFERMODE request but support PIO0-2
		   timings and no IORDY */
		if (!ata_id_has_iordy(dev->id) && dev->pio_mode <= XFER_PIO_2)
			ign_dev_err = 1;
	}
3223 3224
	/* Early MWDMA devices do DMA but don't allow DMA mode setting.
	   Don't fail an MWDMA0 set IFF the device indicates it is in MWDMA0 */
3225
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3226 3227
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3228
		ign_dev_err = 1;
3229

3230 3231 3232
	/* if the device is actually configured correctly, ignore dev err */
	if (dev->xfer_mode == ata_xfer_mask2mode(ata_id_xfermask(dev->id)))
		ign_dev_err = 1;
L
Linus Torvalds 已提交
3233

3234 3235 3236 3237 3238 3239
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3240

3241 3242
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3243

3244 3245 3246
	ata_dev_info(dev, "configured for %s%s\n",
		     ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		     dev_err_whine);
3247

3248
	return 0;
3249 3250

 fail:
3251
	ata_dev_err(dev, "failed to set xfermode (err_mask=0x%x)\n", err_mask);
3252
	return -EIO;
L
Linus Torvalds 已提交
3253 3254 3255
}

/**
3256
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3257
 *	@link: link on which timings will be programmed
J
Joe Perches 已提交
3258
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3259
 *
3260 3261 3262
 *	Standard implementation of the function used to tune and set
 *	ATA device disk transfer mode (PIO3, UDMA6, etc.).  If
 *	ata_dev_set_mode() fails, pointer to the failing device is
3263
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3264
 *
L
Linus Torvalds 已提交
3265
 *	LOCKING:
J
Jeff Garzik 已提交
3266
 *	PCI/etc. bus probe sem.
3267 3268 3269
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3270
 */
3271

3272
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3273
{
3274
	struct ata_port *ap = link->ap;
3275
	struct ata_device *dev;
3276
	int rc = 0, used_dma = 0, found = 0;
3277

3278
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3279
	ata_for_each_dev(dev, link, ENABLED) {
3280
		unsigned long pio_mask, dma_mask;
3281
		unsigned int mode_mask;
3282

3283 3284 3285 3286 3287 3288
		mode_mask = ATA_DMA_MASK_ATA;
		if (dev->class == ATA_DEV_ATAPI)
			mode_mask = ATA_DMA_MASK_ATAPI;
		else if (ata_id_is_cfa(dev->id))
			mode_mask = ATA_DMA_MASK_CFA;

T
Tejun Heo 已提交
3289
		ata_dev_xfermask(dev);
3290
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3291

3292
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3293 3294

		if (libata_dma_mask & mode_mask)
3295 3296
			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
						     dev->udma_mask);
3297 3298 3299
		else
			dma_mask = 0;

3300 3301
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3302

3303
		found = 1;
3304
		if (ata_dma_enabled(dev))
3305
			used_dma = 1;
3306
	}
3307
	if (!found)
3308
		goto out;
3309 3310

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3311
	ata_for_each_dev(dev, link, ENABLED) {
3312
		if (dev->pio_mode == 0xff) {
3313
			ata_dev_warn(dev, "no PIO support\n");
3314
			rc = -EINVAL;
3315
			goto out;
3316 3317 3318 3319 3320 3321 3322
		}

		dev->xfer_mode = dev->pio_mode;
		dev->xfer_shift = ATA_SHIFT_PIO;
		if (ap->ops->set_piomode)
			ap->ops->set_piomode(ap, dev);
	}
L
Linus Torvalds 已提交
3323

3324
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3325 3326
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3327 3328 3329 3330 3331 3332 3333
			continue;

		dev->xfer_mode = dev->dma_mode;
		dev->xfer_shift = ata_xfer_mode2shift(dev->dma_mode);
		if (ap->ops->set_dmamode)
			ap->ops->set_dmamode(ap, dev);
	}
L
Linus Torvalds 已提交
3334 3335

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3336
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3337
		rc = ata_dev_set_mode(dev);
3338
		if (rc)
3339
			goto out;
3340
	}
L
Linus Torvalds 已提交
3341

3342 3343
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3344
	 */
J
Jeff Garzik 已提交
3345
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3346
		ap->host->simplex_claimed = ap;
3347

3348 3349 3350 3351
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3352 3353
}

3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377
/**
 *	ata_wait_ready - wait for link to become ready
 *	@link: link to be waited on
 *	@deadline: deadline jiffies for the operation
 *	@check_ready: callback to check link readiness
 *
 *	Wait for @link to become ready.  @check_ready should return
 *	positive number if @link is ready, 0 if it isn't, -ENODEV if
 *	link doesn't seem to be occupied, other errno for other error
 *	conditions.
 *
 *	Transient -ENODEV conditions are allowed for
 *	ATA_TMOUT_FF_WAIT.
 *
 *	LOCKING:
 *	EH context.
 *
 *	RETURNS:
 *	0 if @linke is ready before @deadline; otherwise, -errno.
 */
int ata_wait_ready(struct ata_link *link, unsigned long deadline,
		   int (*check_ready)(struct ata_link *link))
{
	unsigned long start = jiffies;
3378
	unsigned long nodev_deadline;
3379 3380
	int warned = 0;

3381 3382 3383 3384 3385 3386
	/* choose which 0xff timeout to use, read comment in libata.h */
	if (link->ap->host->flags & ATA_HOST_PARALLEL_SCAN)
		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT_LONG);
	else
		nodev_deadline = ata_deadline(start, ATA_TMOUT_FF_WAIT);

T
Tejun Heo 已提交
3387 3388 3389 3390 3391 3392
	/* Slave readiness can't be tested separately from master.  On
	 * M/S emulation configuration, this function should be called
	 * only on the master and it will handle both master and slave.
	 */
	WARN_ON(link == link->ap->slave_link);

3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403
	if (time_after(nodev_deadline, deadline))
		nodev_deadline = deadline;

	while (1) {
		unsigned long now = jiffies;
		int ready, tmp;

		ready = tmp = check_ready(link);
		if (ready > 0)
			return 0;

3404 3405
		/*
		 * -ENODEV could be transient.  Ignore -ENODEV if link
3406
		 * is online.  Also, some SATA devices take a long
3407 3408 3409
		 * time to clear 0xff after reset.  Wait for
		 * ATA_TMOUT_FF_WAIT[_LONG] on -ENODEV if link isn't
		 * offline.
3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430
		 *
		 * Note that some PATA controllers (pata_ali) explode
		 * if status register is read more than once when
		 * there's no device attached.
		 */
		if (ready == -ENODEV) {
			if (ata_link_online(link))
				ready = 0;
			else if ((link->ap->flags & ATA_FLAG_SATA) &&
				 !ata_link_offline(link) &&
				 time_before(now, nodev_deadline))
				ready = 0;
		}

		if (ready)
			return ready;
		if (time_after(now, deadline))
			return -EBUSY;

		if (!warned && time_after(now, start + 5 * HZ) &&
		    (deadline - now > 3 * HZ)) {
3431
			ata_link_warn(link,
3432 3433 3434 3435 3436
				"link is slow to respond, please be patient "
				"(ready=%d)\n", tmp);
			warned = 1;
		}

3437
		ata_msleep(link->ap, 50);
3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454
	}
}

/**
 *	ata_wait_after_reset - wait for link to become ready after reset
 *	@link: link to be waited on
 *	@deadline: deadline jiffies for the operation
 *	@check_ready: callback to check link readiness
 *
 *	Wait for @link to become ready after reset.
 *
 *	LOCKING:
 *	EH context.
 *
 *	RETURNS:
 *	0 if @linke is ready before @deadline; otherwise, -errno.
 */
3455
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3456 3457
				int (*check_ready)(struct ata_link *link))
{
3458
	ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
3459 3460 3461 3462

	return ata_wait_ready(link, deadline, check_ready);
}

3463
/**
3464 3465
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3466
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3467
 *	@deadline: deadline jiffies for the operation
3468
 *
3469
 *	Make sure SStatus of @link reaches stable state, determined by
3470 3471
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3472 3473
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3474 3475
 *	until timeout then returns 0 if DET is stable at 1.
 *
3476 3477 3478
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3479 3480 3481 3482 3483 3484
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3485 3486
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3487
{
3488 3489
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3490
	unsigned long last_jiffies, t;
3491 3492 3493
	u32 last, cur;
	int rc;

3494
	t = ata_deadline(jiffies, params[2]);
3495 3496 3497
	if (time_before(t, deadline))
		deadline = t;

3498
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3499 3500 3501 3502 3503 3504 3505
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3506
		ata_msleep(link->ap, interval);
3507
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3508 3509 3510 3511 3512
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3513
			if (cur == 1 && time_before(jiffies, deadline))
3514
				continue;
3515 3516
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3517 3518 3519 3520 3521 3522 3523 3524
				return 0;
			continue;
		}

		/* unstable, start over */
		last = cur;
		last_jiffies = jiffies;

3525 3526 3527
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3528
		if (time_after(jiffies, deadline))
3529
			return -EPIPE;
3530 3531 3532 3533
	}
}

/**
3534 3535
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3536
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3537
 *	@deadline: deadline jiffies for the operation
3538
 *
3539
 *	Resume SATA phy @link and debounce it.
3540 3541 3542 3543 3544 3545 3546
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3547 3548
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3549
{
3550
	int tries = ATA_LINK_RESUME_TRIES;
3551
	u32 scontrol, serror;
3552 3553
	int rc;

3554
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3555
		return rc;
3556

3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570
	/*
	 * Writes to SControl sometimes get ignored under certain
	 * controllers (ata_piix SIDPR).  Make sure DET actually is
	 * cleared.
	 */
	do {
		scontrol = (scontrol & 0x0f0) | 0x300;
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
			return rc;
		/*
		 * Some PHYs react badly if SStatus is pounded
		 * immediately after resuming.  Delay 200ms before
		 * debouncing.
		 */
3571
		ata_msleep(link->ap, 200);
3572

3573 3574 3575 3576
		/* is SControl restored correctly? */
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
			return rc;
	} while ((scontrol & 0xf0f) != 0x300 && --tries);
3577

3578
	if ((scontrol & 0xf0f) != 0x300) {
3579
		ata_link_warn(link, "failed to resume link (SControl %X)\n",
3580
			     scontrol);
3581 3582 3583 3584
		return 0;
	}

	if (tries < ATA_LINK_RESUME_TRIES)
3585 3586
		ata_link_warn(link, "link resume succeeded after %d retries\n",
			      ATA_LINK_RESUME_TRIES - tries);
3587

3588 3589 3590
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3591
	/* clear SError, some PHYs require this even for SRST to work */
3592 3593 3594
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3595
	return rc != -EINVAL ? rc : 0;
3596 3597
}

3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630
/**
 *	sata_link_scr_lpm - manipulate SControl IPM and SPM fields
 *	@link: ATA link to manipulate SControl for
 *	@policy: LPM policy to configure
 *	@spm_wakeup: initiate LPM transition to active state
 *
 *	Manipulate the IPM field of the SControl register of @link
 *	according to @policy.  If @policy is ATA_LPM_MAX_POWER and
 *	@spm_wakeup is %true, the SPM field is manipulated to wake up
 *	the link.  This function also clears PHYRDY_CHG before
 *	returning.
 *
 *	LOCKING:
 *	EH context.
 *
 *	RETURNS:
 *	0 on succes, -errno otherwise.
 */
int sata_link_scr_lpm(struct ata_link *link, enum ata_lpm_policy policy,
		      bool spm_wakeup)
{
	struct ata_eh_context *ehc = &link->eh_context;
	bool woken_up = false;
	u32 scontrol;
	int rc;

	rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
	if (rc)
		return rc;

	switch (policy) {
	case ATA_LPM_MAX_POWER:
		/* disable all LPM transitions */
3631
		scontrol |= (0x7 << 8);
3632 3633 3634 3635 3636 3637 3638 3639 3640
		/* initiate transition to active state */
		if (spm_wakeup) {
			scontrol |= (0x4 << 12);
			woken_up = true;
		}
		break;
	case ATA_LPM_MED_POWER:
		/* allow LPM to PARTIAL */
		scontrol &= ~(0x1 << 8);
3641
		scontrol |= (0x6 << 8);
3642 3643
		break;
	case ATA_LPM_MIN_POWER:
3644 3645
		if (ata_link_nr_enabled(link) > 0)
			/* no restrictions on LPM transitions */
3646
			scontrol &= ~(0x7 << 8);
3647 3648 3649 3650 3651
		else {
			/* empty port, power off */
			scontrol &= ~0xf;
			scontrol |= (0x1 << 2);
		}
3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669
		break;
	default:
		WARN_ON(1);
	}

	rc = sata_scr_write(link, SCR_CONTROL, scontrol);
	if (rc)
		return rc;

	/* give the link time to transit out of LPM state */
	if (woken_up)
		msleep(10);

	/* clear PHYRDY_CHG from SError */
	ehc->i.serror &= ~SERR_PHYRDY_CHG;
	return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
}

3670
/**
3671
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3672
 *	@link: ATA link to be reset
3673
 *	@deadline: deadline jiffies for the operation
3674
 *
T
Tejun Heo 已提交
3675
 *	@link is about to be reset.  Initialize it.  Failure from
T
Tejun Heo 已提交
3676 3677 3678 3679
 *	prereset makes libata abort whole reset sequence and give up
 *	that port, so prereset should be best-effort.  It does its
 *	best to prepare for reset sequence but if things go wrong, it
 *	should just whine, not fail.
3680 3681 3682 3683 3684 3685 3686
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3687
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3688
{
T
Tejun Heo 已提交
3689
	struct ata_port *ap = link->ap;
3690
	struct ata_eh_context *ehc = &link->eh_context;
3691
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3692 3693 3694 3695 3696 3697
	int rc;

	/* if we're about to do hardreset, nothing more to do */
	if (ehc->i.action & ATA_EH_HARDRESET)
		return 0;

3698
	/* if SATA, resume link */
3699
	if (ap->flags & ATA_FLAG_SATA) {
3700
		rc = sata_link_resume(link, timing, deadline);
T
Tejun Heo 已提交
3701 3702
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
3703 3704 3705
			ata_link_warn(link,
				      "failed to resume link for reset (errno=%d)\n",
				      rc);
3706 3707
	}

3708
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3709
	if (ata_phys_link_offline(link))
3710 3711
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3712 3713 3714
	return 0;
}

3715
/**
T
Tejun Heo 已提交
3716 3717 3718
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3719
 *	@deadline: deadline jiffies for the operation
3720 3721
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3722
 *
T
Tejun Heo 已提交
3723
 *	SATA phy-reset @link using DET bits of SControl register.
3724 3725 3726 3727 3728 3729 3730 3731
 *	After hardreset, link readiness is waited upon using
 *	ata_wait_ready() if @check_ready is specified.  LLDs are
 *	allowed to not specify @check_ready and wait itself after this
 *	function returns.  Device classification is LLD's
 *	responsibility.
 *
 *	*@online is set to one iff reset succeeded and @link is online
 *	after reset.
3732 3733 3734 3735 3736 3737 3738
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
T
Tejun Heo 已提交
3739
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3740 3741
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3742
{
T
Tejun Heo 已提交
3743
	u32 scontrol;
3744
	int rc;
3745

3746 3747
	DPRINTK("ENTER\n");

3748 3749 3750
	if (online)
		*online = false;

3751
	if (sata_set_spd_needed(link)) {
3752 3753 3754 3755 3756
		/* SATA spec says nothing about how to reconfigure
		 * spd.  To be on the safe side, turn off phy during
		 * reconfiguration.  This works for at least ICH7 AHCI
		 * and Sil3124.
		 */
3757
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3758
			goto out;
3759

3760
		scontrol = (scontrol & 0x0f0) | 0x304;
3761

3762
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3763
			goto out;
3764

3765
		sata_set_spd(link);
3766 3767 3768
	}

	/* issue phy wake/reset */
3769
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3770
		goto out;
3771

3772
	scontrol = (scontrol & 0x0f0) | 0x301;
3773

3774
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3775
		goto out;
3776

3777
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3778 3779
	 * 10.4.2 says at least 1 ms.
	 */
3780
	ata_msleep(link->ap, 1);
3781

3782 3783
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3784 3785 3786
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3787
	if (ata_phys_link_offline(link))
3788 3789 3790 3791 3792 3793
		goto out;

	/* Link is online.  From this point, -ENODEV too is an error. */
	if (online)
		*online = true;

T
Tejun Heo 已提交
3794
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3795 3796 3797 3798 3799 3800 3801 3802
		/* If PMP is supported, we have to do follow-up SRST.
		 * Some PMPs don't send D2H Reg FIS after hardreset if
		 * the first port is empty.  Wait only for
		 * ATA_TMOUT_PMP_SRST_WAIT.
		 */
		if (check_ready) {
			unsigned long pmp_deadline;

3803 3804
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815
			if (time_after(pmp_deadline, deadline))
				pmp_deadline = deadline;
			ata_wait_ready(link, pmp_deadline, check_ready);
		}
		rc = -EAGAIN;
		goto out;
	}

	rc = 0;
	if (check_ready)
		rc = ata_wait_ready(link, deadline, check_ready);
3816
 out:
3817 3818 3819 3820
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3821
		ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
3822
	}
3823 3824 3825 3826
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852
/**
 *	sata_std_hardreset - COMRESET w/o waiting or classification
 *	@link: link to reset
 *	@class: resulting class of attached device
 *	@deadline: deadline jiffies for the operation
 *
 *	Standard SATA COMRESET w/o waiting or classification.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 if link offline, -EAGAIN if link online, -errno on errors.
 */
int sata_std_hardreset(struct ata_link *link, unsigned int *class,
		       unsigned long deadline)
{
	const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
	bool online;
	int rc;

	/* do hardreset */
	rc = sata_link_hardreset(link, timing, deadline, &online, NULL);
	return online ? -EAGAIN : rc;
}

3853
/**
3854
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3855
 *	@link: the target ata_link
3856 3857 3858 3859 3860 3861 3862 3863 3864
 *	@classes: classes of attached devices
 *
 *	This function is invoked after a successful reset.  Note that
 *	the device might have been reset more than once using
 *	different reset methods before postreset is invoked.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
3865
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3866
{
3867 3868
	u32 serror;

3869 3870
	DPRINTK("ENTER\n");

3871 3872 3873 3874
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3875
	/* print link status */
3876
	sata_print_link_status(link);
3877 3878 3879 3880

	DPRINTK("EXIT\n");
}

3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896
/**
 *	ata_dev_same_device - Determine whether new ID matches configured device
 *	@dev: device to compare against
 *	@new_class: class of the new device
 *	@new_id: IDENTIFY page of the new device
 *
 *	Compare @new_class and @new_id against @dev and determine
 *	whether @dev is the device indicated by @new_class and
 *	@new_id.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if @dev matches @new_class and @new_id, 0 otherwise.
 */
T
Tejun Heo 已提交
3897 3898
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3899 3900
{
	const u16 *old_id = dev->id;
3901 3902
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3903 3904

	if (dev->class != new_class) {
3905 3906
		ata_dev_info(dev, "class mismatch %d != %d\n",
			     dev->class, new_class);
3907 3908 3909
		return 0;
	}

3910 3911 3912 3913
	ata_id_c_string(old_id, model[0], ATA_ID_PROD, sizeof(model[0]));
	ata_id_c_string(new_id, model[1], ATA_ID_PROD, sizeof(model[1]));
	ata_id_c_string(old_id, serial[0], ATA_ID_SERNO, sizeof(serial[0]));
	ata_id_c_string(new_id, serial[1], ATA_ID_SERNO, sizeof(serial[1]));
3914 3915

	if (strcmp(model[0], model[1])) {
3916 3917
		ata_dev_info(dev, "model number mismatch '%s' != '%s'\n",
			     model[0], model[1]);
3918 3919 3920 3921
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3922 3923
		ata_dev_info(dev, "serial number mismatch '%s' != '%s'\n",
			     serial[0], serial[1]);
3924 3925 3926 3927 3928 3929 3930
		return 0;
	}

	return 1;
}

/**
3931
 *	ata_dev_reread_id - Re-read IDENTIFY data
H
Henrik Kretzschmar 已提交
3932
 *	@dev: target ATA device
3933
 *	@readid_flags: read ID flags
3934 3935 3936 3937 3938 3939 3940 3941 3942 3943
 *
 *	Re-read IDENTIFY page and make sure @dev is still attached to
 *	the port.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
3944
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3945
{
3946
	unsigned int class = dev->class;
T
Tejun Heo 已提交
3947
	u16 *id = (void *)dev->link->ap->sector_buf;
3948 3949
	int rc;

3950
	/* read ID data */
3951
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
3952
	if (rc)
3953
		return rc;
3954 3955

	/* is the device still there? */
3956 3957
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
3958

3959
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
3960 3961 3962 3963 3964 3965
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
3966
 *	@new_class: new class code
3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977
 *	@readid_flags: read ID flags
 *
 *	Re-read IDENTIFY page, make sure @dev is still attached to the
 *	port and reconfigure it according to the new IDENTIFY page.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
 */
3978 3979
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
3980
{
3981
	u64 n_sectors = dev->n_sectors;
T
Tejun Heo 已提交
3982
	u64 n_native_sectors = dev->n_native_sectors;
3983 3984 3985 3986 3987
	int rc;

	if (!ata_dev_enabled(dev))
		return -ENODEV;

3988 3989
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
3990 3991 3992
	    new_class != ATA_DEV_ATA &&
	    new_class != ATA_DEV_ATAPI &&
	    new_class != ATA_DEV_SEMB) {
3993 3994
		ata_dev_info(dev, "class mismatch %u != %u\n",
			     dev->class, new_class);
3995 3996 3997 3998
		rc = -ENODEV;
		goto fail;
	}

3999 4000 4001 4002
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
4003 4004

	/* configure device according to the new ID */
4005
	rc = ata_dev_configure(dev);
4006 4007 4008 4009
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
T
Tejun Heo 已提交
4010 4011 4012 4013 4014
	if (dev->class != ATA_DEV_ATA || !n_sectors ||
	    dev->n_sectors == n_sectors)
		return 0;

	/* n_sectors has changed */
4015 4016 4017
	ata_dev_warn(dev, "n_sectors mismatch %llu != %llu\n",
		     (unsigned long long)n_sectors,
		     (unsigned long long)dev->n_sectors);
T
Tejun Heo 已提交
4018 4019 4020 4021 4022 4023 4024 4025

	/*
	 * Something could have caused HPA to be unlocked
	 * involuntarily.  If n_native_sectors hasn't changed and the
	 * new size matches it, keep the device.
	 */
	if (dev->n_native_sectors == n_native_sectors &&
	    dev->n_sectors > n_sectors && dev->n_sectors == n_native_sectors) {
4026 4027 4028
		ata_dev_warn(dev,
			     "new n_sectors matches native, probably "
			     "late HPA unlock, n_sectors updated\n");
4029
		/* use the larger n_sectors */
T
Tejun Heo 已提交
4030
		return 0;
4031 4032
	}

T
Tejun Heo 已提交
4033 4034 4035 4036 4037 4038 4039 4040 4041
	/*
	 * Some BIOSes boot w/o HPA but resume w/ HPA locked.  Try
	 * unlocking HPA in those cases.
	 *
	 * https://bugzilla.kernel.org/show_bug.cgi?id=15396
	 */
	if (dev->n_native_sectors == n_native_sectors &&
	    dev->n_sectors < n_sectors && n_sectors == n_native_sectors &&
	    !(dev->horkage & ATA_HORKAGE_BROKEN_HPA)) {
4042 4043 4044
		ata_dev_warn(dev,
			     "old n_sectors matches native, probably "
			     "late HPA lock, will try to unlock HPA\n");
T
Tejun Heo 已提交
4045 4046 4047 4048 4049
		/* try unlocking HPA */
		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
		rc = -EIO;
	} else
		rc = -ENODEV;
4050

T
Tejun Heo 已提交
4051 4052 4053
	/* restore original n_[native_]sectors and fail */
	dev->n_native_sectors = n_native_sectors;
	dev->n_sectors = n_sectors;
4054
 fail:
4055
	ata_dev_err(dev, "revalidation failed (errno=%d)\n", rc);
4056 4057 4058
	return rc;
}

4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075
struct ata_blacklist_entry {
	const char *model_num;
	const char *model_rev;
	unsigned long horkage;
};

static const struct ata_blacklist_entry ata_device_blacklist [] = {
	/* Devices with DMA related problems under Linux */
	{ "WDC AC11000H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC22100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32500H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC33100H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC31600H",	NULL,		ATA_HORKAGE_NODMA },
	{ "WDC AC32100H",	"24.09P07",	ATA_HORKAGE_NODMA },
	{ "WDC AC23200L",	"21.10N21",	ATA_HORKAGE_NODMA },
	{ "Compaq CRD-8241B", 	NULL,		ATA_HORKAGE_NODMA },
	{ "CRD-8400B",		NULL, 		ATA_HORKAGE_NODMA },
4076
	{ "CRD-848[02]B",	NULL,		ATA_HORKAGE_NODMA },
4077 4078 4079 4080 4081
	{ "CRD-84",		NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B",	NULL,		ATA_HORKAGE_NODMA },
	{ "SanDisk SDP3B-64",	NULL,		ATA_HORKAGE_NODMA },
	{ "SANYO CD-ROM CRD",	NULL,		ATA_HORKAGE_NODMA },
	{ "HITACHI CDR-8",	NULL,		ATA_HORKAGE_NODMA },
4082
	{ "HITACHI CDR-8[34]35",NULL,		ATA_HORKAGE_NODMA },
4083 4084 4085 4086 4087 4088 4089 4090 4091 4092
	{ "Toshiba CD-ROM XM-6202B", NULL,	ATA_HORKAGE_NODMA },
	{ "TOSHIBA CD-ROM XM-1702BC", NULL,	ATA_HORKAGE_NODMA },
	{ "CD-532E-A", 		NULL,		ATA_HORKAGE_NODMA },
	{ "E-IDE CD-ROM CR-840",NULL,		ATA_HORKAGE_NODMA },
	{ "CD-ROM Drive/F5A",	NULL,		ATA_HORKAGE_NODMA },
	{ "WPI CDD-820", 	NULL,		ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC-148C", NULL,	ATA_HORKAGE_NODMA },
	{ "SAMSUNG CD-ROM SC",	NULL,		ATA_HORKAGE_NODMA },
	{ "ATAPI CD-ROM DRIVE 40X MAXIMUM",NULL,ATA_HORKAGE_NODMA },
	{ "_NEC DV5800A", 	NULL,		ATA_HORKAGE_NODMA },
4093
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4094
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4095
	{ " 2GB ATA Flash Disk", "ADMA428M",	ATA_HORKAGE_NODMA },
4096
	/* Odd clown on sil3726/4726 PMPs */
4097
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4098

4099
	/* Weird ATAPI devices */
T
Tejun Heo 已提交
4100
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4101
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4102

4103 4104 4105 4106
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4107
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4108
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4109 4110
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4111
	/* NCQ is broken */
4112
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4113
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4114
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4115
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4116
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4117

4118
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4119
	{ "ST31500341AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4120
						ATA_HORKAGE_FIRMWARE_WARN },
4121

4122
	{ "ST31000333AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4123 4124
						ATA_HORKAGE_FIRMWARE_WARN },

4125
	{ "ST3640[36]23AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4126 4127
						ATA_HORKAGE_FIRMWARE_WARN },

4128
	{ "ST3320[68]13AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4129 4130
						ATA_HORKAGE_FIRMWARE_WARN },

4131 4132 4133 4134 4135
	/* Blacklist entries taken from Silicon Image 3124/3132
	   Windows driver .inf file - also several Linux problem reports */
	{ "HTS541060G9SA00",    "MB3OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541080G9SA00",    "MB4OC60D",     ATA_HORKAGE_NONCQ, },
	{ "HTS541010G9SA00",    "MBZOC60D",     ATA_HORKAGE_NONCQ, },
4136

4137 4138 4139
	/* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
	{ "C300-CTFDDAC128MAG",	"0001",		ATA_HORKAGE_NONCQ, },

4140 4141 4142 4143 4144
	/* devices which puke on READ_NATIVE_MAX */
	{ "HDS724040KLSA80",	"KFAOA20N",	ATA_HORKAGE_BROKEN_HPA, },
	{ "WDC WD3200JD-00KLB0", "WD-WCAMR1130137", ATA_HORKAGE_BROKEN_HPA },
	{ "WDC WD2500JD-00HBB0", "WD-WMAL71490727", ATA_HORKAGE_BROKEN_HPA },
	{ "MAXTOR 6L080L4",	"A93.0500",	ATA_HORKAGE_BROKEN_HPA },
4145

T
Tejun Heo 已提交
4146 4147 4148
	/* this one allows HPA unlocking but fails IOs on the area */
	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },

4149 4150 4151
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4152
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4153

A
Alan Cox 已提交
4154 4155
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4156
	/* Maybe we should just blacklist TSSTcorp... */
4157
	{ "TSSTcorp CDDVDW SH-S202[HJN]", "SB0[01]",  ATA_HORKAGE_IVB, },
A
Alan Cox 已提交
4158

4159 4160
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },
4161
	{ "BUFFALO HD-QSU2/R5",		NULL,	ATA_HORKAGE_BRIDGE_OK, },
4162

4163 4164
	/* Devices which aren't very happy with higher link speeds */
	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },
4165
	{ "Seagate FreeAgent GoFlex",	NULL,	ATA_HORKAGE_1_5_GBPS, },
4166

4167 4168 4169 4170
	/*
	 * Devices which choke on SETXFER.  Applies only if both the
	 * device and controller are SATA.
	 */
4171
	{ "PIONEER DVD-RW  DVRTD08",	NULL,	ATA_HORKAGE_NOSETXFER },
4172 4173
	{ "PIONEER DVD-RW  DVRTD08A",	NULL,	ATA_HORKAGE_NOSETXFER },
	{ "PIONEER DVD-RW  DVR-215",	NULL,	ATA_HORKAGE_NOSETXFER },
4174 4175
	{ "PIONEER DVD-RW  DVR-212D",	NULL,	ATA_HORKAGE_NOSETXFER },
	{ "PIONEER DVD-RW  DVR-216D",	NULL,	ATA_HORKAGE_NOSETXFER },
4176

4177 4178
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4179
};
4180

4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192
/**
 *	glob_match - match a text string against a glob-style pattern
 *	@text: the string to be examined
 *	@pattern: the glob-style pattern to be matched against
 *
 *	Either/both of text and pattern can be empty strings.
 *
 *	Match text against a glob-style pattern, with wildcards and simple sets:
 *
 *		?	matches any single character.
 *		*	matches any run of characters.
 *		[xyz]	matches a single character from the set: x, y, or z.
4193 4194
 *		[a-d]	matches a single character from the range: a, b, c, or d.
 *		[a-d0-9] matches a single character from either range.
4195
 *
4196 4197
 *	The special characters ?, [, -, or *, can be matched using a set, eg. [*]
 *	Behaviour with malformed patterns is undefined, though generally reasonable.
4198
 *
4199
 *	Sample patterns:  "SD1?",  "SD1[0-5]",  "*R0",  "SD*1?[012]*xx"
4200 4201 4202 4203 4204 4205 4206 4207 4208
 *
 *	This function uses one level of recursion per '*' in pattern.
 *	Since it calls _nothing_ else, and has _no_ explicit local variables,
 *	this will not cause stack problems for any reasonable use here.
 *
 *	RETURNS:
 *	0 on match, 1 otherwise.
 */
static int glob_match (const char *text, const char *pattern)
4209
{
4210 4211 4212 4213 4214 4215 4216 4217 4218
	do {
		/* Match single character or a '?' wildcard */
		if (*text == *pattern || *pattern == '?') {
			if (!*pattern++)
				return 0;  /* End of both strings: match */
		} else {
			/* Match single char against a '[' bracketed ']' pattern set */
			if (!*text || *pattern != '[')
				break;  /* Not a pattern set */
4219 4220 4221 4222 4223 4224 4225
			while (*++pattern && *pattern != ']' && *text != *pattern) {
				if (*pattern == '-' && *(pattern - 1) != '[')
					if (*text > *(pattern - 1) && *text < *(pattern + 1)) {
						++pattern;
						break;
					}
			}
4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240
			if (!*pattern || *pattern == ']')
				return 1;  /* No match */
			while (*pattern && *pattern++ != ']');
		}
	} while (*++text && *pattern);

	/* Match any run of chars against a '*' wildcard */
	if (*pattern == '*') {
		if (!*++pattern)
			return 0;  /* Match: avoid recursion at end of pattern */
		/* Loop to handle additional pattern chars after the wildcard */
		while (*text) {
			if (glob_match(text, pattern) == 0)
				return 0;  /* Remainder matched */
			++text;  /* Absorb (match) this char and try again */
4241 4242
		}
	}
4243 4244 4245
	if (!*text && !*pattern)
		return 0;  /* End of both strings: match */
	return 1;  /* No match */
4246
}
4247

T
Tejun Heo 已提交
4248
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4249
{
T
Tejun Heo 已提交
4250 4251
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4252
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4253

T
Tejun Heo 已提交
4254 4255
	ata_id_c_string(dev->id, model_num, ATA_ID_PROD, sizeof(model_num));
	ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
L
Linus Torvalds 已提交
4256

4257
	while (ad->model_num) {
4258
		if (!glob_match(model_num, ad->model_num)) {
4259 4260
			if (ad->model_rev == NULL)
				return ad->horkage;
4261
			if (!glob_match(model_rev, ad->model_rev))
4262
				return ad->horkage;
4263
		}
4264
		ad++;
4265
	}
L
Linus Torvalds 已提交
4266 4267 4268
	return 0;
}

4269 4270 4271 4272 4273 4274
static int ata_dma_blacklisted(const struct ata_device *dev)
{
	/* We don't support polling DMA.
	 * DMA blacklist those ATAPI devices with CDB-intr (and use PIO)
	 * if the LLDD handles only interrupts in the HSM_ST_LAST state.
	 */
T
Tejun Heo 已提交
4275
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4276 4277
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
T
Tejun Heo 已提交
4278
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4279 4280
}

A
Alan Cox 已提交
4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295
/**
 *	ata_is_40wire		-	check drive side detection
 *	@dev: device
 *
 *	Perform drive side detection decoding, allowing for device vendors
 *	who can't follow the documentation.
 */

static int ata_is_40wire(struct ata_device *dev)
{
	if (dev->horkage & ATA_HORKAGE_IVB)
		return ata_drive_40wire_relaxed(dev->id);
	return ata_drive_40wire(dev->id);
}

4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313
/**
 *	cable_is_40wire		-	40/80/SATA decider
 *	@ap: port to consider
 *
 *	This function encapsulates the policy for speed management
 *	in one place. At the moment we don't cache the result but
 *	there is a good case for setting ap->cbl to the result when
 *	we are called with unknown cables (and figuring out if it
 *	impacts hotplug at all).
 *
 *	Return 1 if the cable appears to be 40 wire.
 */

static int cable_is_40wire(struct ata_port *ap)
{
	struct ata_link *link;
	struct ata_device *dev;

T
Tejun Heo 已提交
4314
	/* If the controller thinks we are 40 wire, we are. */
4315 4316
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
T
Tejun Heo 已提交
4317 4318

	/* If the controller thinks we are 80 wire, we are. */
4319 4320
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
T
Tejun Heo 已提交
4321 4322 4323 4324 4325

	/* If the system is known to be 40 wire short cable (eg
	 * laptop), then we allow 80 wire modes even if the drive
	 * isn't sure.
	 */
A
Alan Cox 已提交
4326 4327
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
T
Tejun Heo 已提交
4328 4329 4330 4331 4332 4333 4334 4335 4336 4337

	/* If the controller doesn't know, we scan.
	 *
	 * Note: We look for all 40 wire detects at this point.  Any
	 *       80 wire detect is taken to be 80 wire cable because
	 * - in many setups only the one drive (slave if present) will
	 *   give a valid detect
	 * - if you have a non detect capable drive you don't want it
	 *   to colour the choice
	 */
T
Tejun Heo 已提交
4338 4339 4340
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4341 4342 4343 4344 4345 4346
				return 0;
		}
	}
	return 1;
}

4347 4348 4349 4350
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4351 4352 4353 4354
 *	Compute supported xfermask of @dev and store it in
 *	dev->*_mask.  This function is responsible for applying all
 *	known limits including host controller limits, device
 *	blacklist, etc...
4355 4356 4357 4358
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4359
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4360
{
T
Tejun Heo 已提交
4361 4362
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4363
	struct ata_host *host = ap->host;
4364
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4365

4366
	/* controller modes available */
4367 4368 4369
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4370
	/* drive modes available */
4371 4372 4373
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4374

4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385
	/*
	 *	CFA Advanced TrueIDE timings are not allowed on a shared
	 *	cable
	 */
	if (ata_dev_pair(dev)) {
		/* No PIO5 or PIO6 */
		xfer_mask &= ~(0x03 << (ATA_SHIFT_PIO + 5));
		/* No MWDMA3 or MWDMA 4 */
		xfer_mask &= ~(0x03 << (ATA_SHIFT_MWDMA + 3));
	}

4386 4387
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4388 4389
		ata_dev_warn(dev,
			     "device is on DMA blacklist, disabling DMA\n");
4390
	}
4391

4392
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4393
	    host->simplex_claimed && host->simplex_claimed != ap) {
4394
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4395 4396
		ata_dev_warn(dev,
			     "simplex DMA is claimed by other device, disabling DMA\n");
4397
	}
4398

J
Jeff Garzik 已提交
4399 4400 4401
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4402
	if (ap->ops->mode_filter)
4403
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4404

4405 4406 4407 4408 4409 4410 4411 4412 4413 4414
	/* Apply cable rule here.  Don't apply it early because when
	 * we handle hot plug the cable type can itself change.
	 * Check this last so that we know if the transfer rate was
	 * solely limited by the cable.
	 * Unknown or 80 wire cables reported host side are checked
	 * drive side as well. Cases where we know a 40wire cable
	 * is used safely for 80 are not checked here.
	 */
	if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA))
		/* UDMA/44 or higher would be available */
4415
		if (cable_is_40wire(ap)) {
4416 4417
			ata_dev_warn(dev,
				     "limited to UDMA/33 due to 40-wire cable\n");
4418 4419 4420
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4421 4422
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4423 4424 4425 4426 4427 4428
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4429 4430 4431
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4432
 *	LOCKING:
J
Jeff Garzik 已提交
4433
 *	PCI/etc. bus probe sem.
4434 4435 4436
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4437 4438
 */

T
Tejun Heo 已提交
4439
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4440
{
4441
	struct ata_taskfile tf;
4442
	unsigned int err_mask;
L
Linus Torvalds 已提交
4443 4444 4445 4446

	/* set up set-features taskfile */
	DPRINTK("set features - xfer mode\n");

T
Tejun Heo 已提交
4447 4448 4449
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4450
	ata_tf_init(dev, &tf);
4451 4452
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
T
Tejun Heo 已提交
4453
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4454
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4455
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4456 4457
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4458 4459
	/* If the device has IORDY and the controller does not - turn it off */
 	else if (ata_id_has_iordy(dev->id))
J
Jeff Garzik 已提交
4460
		tf.nsect = 0x01;
A
Alan Cox 已提交
4461 4462
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4463

4464
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4465 4466 4467 4468

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
4469

4470
/**
4471
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4472 4473
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4474
 *	@feature: The sector count represents the feature to set
4475 4476
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4477
 *	on port @ap with sector count
4478 4479 4480 4481 4482 4483 4484
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4485
unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497
{
	struct ata_taskfile tf;
	unsigned int err_mask;

	/* set up set-features taskfile */
	DPRINTK("set features - SATA features\n");

	ata_tf_init(dev, &tf);
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = enable;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
4498
	tf.nsect = feature;
4499

4500
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4501

4502 4503
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4504
}
4505
EXPORT_SYMBOL_GPL(ata_dev_set_feature);
L
Linus Torvalds 已提交
4506

4507 4508 4509
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4510 4511
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4512 4513
 *
 *	LOCKING:
4514 4515 4516 4517
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4518
 */
T
Tejun Heo 已提交
4519 4520
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4521
{
4522
	struct ata_taskfile tf;
4523
	unsigned int err_mask;
4524 4525 4526

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4527
		return AC_ERR_INVALID;
4528 4529 4530 4531

	/* set up init dev params taskfile */
	DPRINTK("init dev params \n");

T
Tejun Heo 已提交
4532
	ata_tf_init(dev, &tf);
4533 4534 4535 4536 4537
	tf.command = ATA_CMD_INIT_DEV_PARAMS;
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf.protocol = ATA_PROT_NODATA;
	tf.nsect = sectors;
	tf.device |= (heads - 1) & 0x0f; /* max head = num. of heads - 1 */
4538

4539
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4540 4541 4542 4543 4544
	/* A clean abort indicates an original or just out of spec drive
	   and we should continue as we issue the setup based on the
	   drive reported working geometry */
	if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
		err_mask = 0;
4545

4546 4547
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4548 4549
}

L
Linus Torvalds 已提交
4550
/**
J
Jeff Garzik 已提交
4551 4552 4553 4554
 *	ata_sg_clean - Unmap DMA memory associated with command
 *	@qc: Command containing DMA memory to be released
 *
 *	Unmap all mapped DMA memory associated with this command.
L
Linus Torvalds 已提交
4555 4556
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4557
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4558
 */
4559
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4560 4561
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4562
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4563 4564
	int dir = qc->dma_dir;

4565
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4566

4567
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4568

4569
	if (qc->n_elem)
4570
		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
L
Linus Torvalds 已提交
4571 4572

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4573
	qc->sg = NULL;
L
Linus Torvalds 已提交
4574 4575 4576
}

/**
4577
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4578 4579
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4580 4581 4582 4583
 *	Allow low-level driver to filter ATA PACKET commands, returning
 *	a status indicating whether or not it is OK to use DMA for the
 *	supplied PACKET command.
 *
L
Linus Torvalds 已提交
4584
 *	LOCKING:
T
Tejun Heo 已提交
4585 4586 4587 4588 4589
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4590
int atapi_check_dma(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
4591 4592
{
	struct ata_port *ap = qc->ap;
4593

T
Tejun Heo 已提交
4594 4595 4596
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4597 4598
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
T
Tejun Heo 已提交
4599
		return 1;
4600

T
Tejun Heo 已提交
4601 4602
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4603

T
Tejun Heo 已提交
4604 4605
	return 0;
}
L
Linus Torvalds 已提交
4606

T
Tejun Heo 已提交
4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624
/**
 *	ata_std_qc_defer - Check whether a qc needs to be deferred
 *	@qc: ATA command in question
 *
 *	Non-NCQ commands cannot run with any other command, NCQ or
 *	not.  As upper layer only knows the queue depth, we are
 *	responsible for maintaining exclusion.  This function checks
 *	whether a new command @qc can be issued.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS:
 *	ATA_DEFER_* if deferring is needed, 0 otherwise.
 */
int ata_std_qc_defer(struct ata_queued_cmd *qc)
{
	struct ata_link *link = qc->dev->link;
4625

T
Tejun Heo 已提交
4626 4627 4628 4629 4630 4631 4632
	if (qc->tf.protocol == ATA_PROT_NCQ) {
		if (!ata_tag_valid(link->active_tag))
			return 0;
	} else {
		if (!ata_tag_valid(link->active_tag) && !link->sactive)
			return 0;
	}
4633

T
Tejun Heo 已提交
4634 4635
	return ATA_DEFER_LINK;
}
4636

T
Tejun Heo 已提交
4637
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4638

T
Tejun Heo 已提交
4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658
/**
 *	ata_sg_init - Associate command with scatter-gather table.
 *	@qc: Command to be associated
 *	@sg: Scatter-gather table.
 *	@n_elem: Number of elements in s/g table.
 *
 *	Initialize the data-related elements of queued_cmd @qc
 *	to point to a scatter-gather table @sg, containing @n_elem
 *	elements.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 */
void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem)
{
	qc->sg = sg;
	qc->n_elem = n_elem;
	qc->cursg = qc->sg;
}
4659

T
Tejun Heo 已提交
4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676
/**
 *	ata_sg_setup - DMA-map the scatter-gather table associated with a command.
 *	@qc: Command with scatter-gather table to be mapped.
 *
 *	DMA-map the scatter-gather table associated with queued_cmd @qc.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS:
 *	Zero on success, negative on error.
 *
 */
static int ata_sg_setup(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	unsigned int n_elem;
L
Linus Torvalds 已提交
4677

T
Tejun Heo 已提交
4678
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4679

T
Tejun Heo 已提交
4680 4681 4682
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4683

T
Tejun Heo 已提交
4684
	DPRINTK("%d sg elements mapped\n", n_elem);
4685
	qc->orig_n_elem = qc->n_elem;
T
Tejun Heo 已提交
4686 4687
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4688

T
Tejun Heo 已提交
4689
	return 0;
L
Linus Torvalds 已提交
4690 4691
}

T
Tejun Heo 已提交
4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704
/**
 *	swap_buf_le16 - swap halves of 16-bit words in place
 *	@buf:  Buffer to swap
 *	@buf_words:  Number of 16-bit words in buffer.
 *
 *	Swap halves of 16-bit words if needed to convert from
 *	little-endian byte order to native cpu byte order, or
 *	vice-versa.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
void swap_buf_le16(u16 *buf, unsigned int buf_words)
4705
{
T
Tejun Heo 已提交
4706 4707
#ifdef __BIG_ENDIAN
	unsigned int i;
4708

T
Tejun Heo 已提交
4709 4710 4711
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4712 4713
}

4714 4715
/**
 *	ata_qc_new - Request an available ATA command, for queueing
R
Randy Dunlap 已提交
4716
 *	@ap: target port
4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743
 *
 *	LOCKING:
 *	None.
 */

static struct ata_queued_cmd *ata_qc_new(struct ata_port *ap)
{
	struct ata_queued_cmd *qc = NULL;
	unsigned int i;

	/* no command while frozen */
	if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
		return NULL;

	/* the last tag is reserved for internal command. */
	for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
		if (!test_and_set_bit(i, &ap->qc_allocated)) {
			qc = __ata_qc_from_tag(ap, i);
			break;
		}

	if (qc)
		qc->tag = i;

	return qc;
}

L
Linus Torvalds 已提交
4744 4745 4746 4747 4748
/**
 *	ata_qc_new_init - Request an available ATA command, and initialize it
 *	@dev: Device from whom we request an available command structure
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4749
 *	None.
L
Linus Torvalds 已提交
4750 4751
 */

4752
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev)
L
Linus Torvalds 已提交
4753
{
T
Tejun Heo 已提交
4754
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
4755 4756
	struct ata_queued_cmd *qc;

4757
	qc = ata_qc_new(ap);
L
Linus Torvalds 已提交
4758 4759 4760 4761 4762
	if (qc) {
		qc->scsicmd = NULL;
		qc->ap = ap;
		qc->dev = dev;

J
Jeff Garzik 已提交
4763
		ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4764 4765 4766 4767 4768
	}

	return qc;
}

4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780
/**
 *	ata_qc_free - free unused ata_queued_cmd
 *	@qc: Command to complete
 *
 *	Designed to free unused ata_queued_cmd object
 *	in case something prevents using it.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 */
void ata_qc_free(struct ata_queued_cmd *qc)
{
4781
	struct ata_port *ap;
4782 4783
	unsigned int tag;

4784
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4785
	ap = qc->ap;
4786 4787 4788 4789 4790 4791 4792 4793 4794

	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
		clear_bit(tag, &ap->qc_allocated);
	}
}

4795
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4796
{
4797 4798
	struct ata_port *ap;
	struct ata_link *link;
4799

4800 4801
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
4802 4803
	ap = qc->ap;
	link = qc->dev->link;
L
Linus Torvalds 已提交
4804 4805 4806 4807

	if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
		ata_sg_clean(qc);

4808
	/* command should be marked inactive atomically with qc completion */
4809
	if (qc->tf.protocol == ATA_PROT_NCQ) {
T
Tejun Heo 已提交
4810
		link->sactive &= ~(1 << qc->tag);
4811 4812 4813
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
T
Tejun Heo 已提交
4814
		link->active_tag = ATA_TAG_POISON;
4815 4816 4817 4818 4819 4820 4821
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4822

4823 4824 4825 4826 4827
	/* atapi: mark qc as inactive to prevent the interrupt handler
	 * from completing the command twice later, before the error handler
	 * is called. (when rc != 0 and atapi request sense is needed)
	 */
	qc->flags &= ~ATA_QCFLAG_ACTIVE;
4828
	ap->qc_active &= ~(1 << qc->tag);
4829

L
Linus Torvalds 已提交
4830
	/* call completion callback */
4831
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4832 4833
}

4834 4835 4836 4837 4838
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4839
	ap->ops->qc_fill_rtf(qc);
4840 4841
}

4842 4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854
static void ata_verify_xfer(struct ata_queued_cmd *qc)
{
	struct ata_device *dev = qc->dev;

	if (ata_is_nodata(qc->tf.protocol))
		return;

	if ((dev->mwdma_mask || dev->udma_mask) && ata_is_pio(qc->tf.protocol))
		return;

	dev->flags &= ~ATA_DFLAG_DUBIOUS_XFER;
}

4855 4856 4857 4858
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *
4859 4860 4861 4862 4863 4864 4865
 *	Indicate to the mid and upper layers that an ATA command has
 *	completed, with either an ok or not-ok status.
 *
 *	Refrain from calling this function multiple times when
 *	successfully completing multiple NCQ commands.
 *	ata_qc_complete_multiple() should be used instead, which will
 *	properly update IRQ expect state.
4866 4867
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4868
 *	spin_lock_irqsave(host lock)
4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887
 */
void ata_qc_complete(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	/* XXX: New EH and old EH use different mechanisms to
	 * synchronize EH with regular execution path.
	 *
	 * In new EH, a failed qc is marked with ATA_QCFLAG_FAILED.
	 * Normal execution path is responsible for not accessing a
	 * failed qc.  libata core enforces the rule by returning NULL
	 * from ata_qc_from_tag() for failed qcs.
	 *
	 * Old EH depends on ata_qc_complete() nullifying completion
	 * requests if ATA_QCFLAG_EH_SCHEDULED is set.  Old EH does
	 * not synchronize with interrupt handler.  Only PIO task is
	 * taken care of.
	 */
	if (ap->ops->error_handler) {
4888 4889 4890
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4891 4892 4893
		if (unlikely(qc->err_mask))
			qc->flags |= ATA_QCFLAG_FAILED;

4894 4895 4896 4897 4898
		/*
		 * Finish internal commands without any further processing
		 * and always with the result TF filled.
		 */
		if (unlikely(ata_tag_internal(qc->tag))) {
4899
			fill_result_tf(qc);
4900 4901 4902
			__ata_qc_complete(qc);
			return;
		}
4903

4904 4905 4906 4907 4908 4909 4910
		/*
		 * Non-internal qc has failed.  Fill the result TF and
		 * summon EH.
		 */
		if (unlikely(qc->flags & ATA_QCFLAG_FAILED)) {
			fill_result_tf(qc);
			ata_qc_schedule_eh(qc);
4911
			return;
4912 4913
		}

4914 4915
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);

4916 4917
		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4918
			fill_result_tf(qc);
4919

4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934
		/* Some commands need post-processing after successful
		 * completion.
		 */
		switch (qc->tf.command) {
		case ATA_CMD_SET_FEATURES:
			if (qc->tf.feature != SETFEATURES_WC_ON &&
			    qc->tf.feature != SETFEATURES_WC_OFF)
				break;
			/* fall through */
		case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
		case ATA_CMD_SET_MULTI: /* multi_count changed */
			/* revalidate device */
			ehi->dev_action[dev->devno] |= ATA_EH_REVALIDATE;
			ata_port_schedule_eh(ap);
			break;
4935 4936 4937 4938

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
4939 4940
		}

4941 4942 4943
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

4944 4945 4946 4947 4948 4949 4950
		__ata_qc_complete(qc);
	} else {
		if (qc->flags & ATA_QCFLAG_EH_SCHEDULED)
			return;

		/* read result TF if failed or requested */
		if (qc->err_mask || qc->flags & ATA_QCFLAG_RESULT_TF)
4951
			fill_result_tf(qc);
4952 4953 4954 4955 4956

		__ata_qc_complete(qc);
	}
}

4957 4958 4959 4960 4961 4962 4963 4964 4965 4966
/**
 *	ata_qc_complete_multiple - Complete multiple qcs successfully
 *	@ap: port in question
 *	@qc_active: new qc_active mask
 *
 *	Complete in-flight commands.  This functions is meant to be
 *	called from low-level driver's interrupt routine to complete
 *	requests normally.  ap->qc_active and @qc_active is compared
 *	and commands are completed accordingly.
 *
4967 4968 4969 4970
 *	Always use this function when completing multiple NCQ commands
 *	from IRQ handlers instead of calling ata_qc_complete()
 *	multiple times to keep IRQ expect status properly in sync.
 *
4971
 *	LOCKING:
J
Jeff Garzik 已提交
4972
 *	spin_lock_irqsave(host lock)
4973 4974 4975 4976
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
4977
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4978 4979 4980 4981 4982 4983 4984
{
	int nr_done = 0;
	u32 done_mask;

	done_mask = ap->qc_active ^ qc_active;

	if (unlikely(done_mask & qc_active)) {
4985 4986
		ata_port_err(ap, "illegal qc_active transition (%08x->%08x)\n",
			     ap->qc_active, qc_active);
4987 4988 4989
		return -EINVAL;
	}

4990
	while (done_mask) {
4991
		struct ata_queued_cmd *qc;
4992
		unsigned int tag = __ffs(done_mask);
4993

4994 4995
		qc = ata_qc_from_tag(ap, tag);
		if (qc) {
4996 4997 4998
			ata_qc_complete(qc);
			nr_done++;
		}
4999
		done_mask &= ~(1 << tag);
5000 5001 5002 5003 5004
	}

	return nr_done;
}

L
Linus Torvalds 已提交
5005 5006 5007 5008 5009 5010 5011 5012 5013 5014
/**
 *	ata_qc_issue - issue taskfile to device
 *	@qc: command to issue to device
 *
 *	Prepare an ATA command to submission to device.
 *	This includes mapping the data into a DMA-able
 *	area, filling in the S/G table, and finally
 *	writing the taskfile to hardware, starting the command.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
5015
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5016
 */
5017
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5018 5019
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
5020
	struct ata_link *link = qc->dev->link;
T
Tejun Heo 已提交
5021
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
5022

5023 5024 5025 5026
	/* Make sure only one non-NCQ command is outstanding.  The
	 * check is skipped for old EH because it reuses active qc to
	 * request ATAPI sense.
	 */
5027
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5028

5029
	if (ata_is_ncq(prot)) {
5030
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
5031 5032 5033

		if (!link->sactive)
			ap->nr_active_links++;
T
Tejun Heo 已提交
5034
		link->sactive |= 1 << qc->tag;
5035
	} else {
5036
		WARN_ON_ONCE(link->sactive);
5037 5038

		ap->nr_active_links++;
T
Tejun Heo 已提交
5039
		link->active_tag = qc->tag;
5040 5041
	}

5042
	qc->flags |= ATA_QCFLAG_ACTIVE;
5043
	ap->qc_active |= 1 << qc->tag;
5044

5045 5046
	/*
	 * We guarantee to LLDs that they will have at least one
5047 5048
	 * non-zero sg if the command is a data command.
	 */
5049 5050 5051
	if (WARN_ON_ONCE(ata_is_data(prot) &&
			 (!qc->sg || !qc->n_elem || !qc->nbytes)))
		goto sys_err;
5052

T
Tejun Heo 已提交
5053
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5054
				 (ap->flags & ATA_FLAG_PIO_DMA)))
T
Tejun Heo 已提交
5055
		if (ata_sg_setup(qc))
5056
			goto sys_err;
L
Linus Torvalds 已提交
5057

T
Tejun Heo 已提交
5058
	/* if device is sleeping, schedule reset and abort the link */
5059
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5060
		link->eh_info.action |= ATA_EH_RESET;
5061 5062 5063 5064 5065
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5066 5067
	ap->ops->qc_prep(qc);

5068 5069 5070 5071
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5072

5073
sys_err:
5074 5075 5076
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5077 5078
}

5079 5080
/**
 *	sata_scr_valid - test whether SCRs are accessible
5081
 *	@link: ATA link to test SCR accessibility for
5082
 *
5083
 *	Test whether SCRs are accessible for @link.
5084 5085 5086 5087 5088 5089 5090
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5091
int sata_scr_valid(struct ata_link *link)
5092
{
5093 5094
	struct ata_port *ap = link->ap;

5095
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5096 5097 5098 5099
}

/**
 *	sata_scr_read - read SCR register of the specified port
5100
 *	@link: ATA link to read SCR for
5101 5102 5103
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5104
 *	Read SCR register @reg of @link into *@val.  This function is
5105 5106
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5107 5108
 *
 *	LOCKING:
5109
 *	None if @link is ap->link.  Kernel thread context otherwise.
5110 5111 5112 5113
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5114
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5115
{
5116 5117
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5118
			return link->ap->ops->scr_read(link, reg, val);
5119 5120 5121 5122
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5123 5124 5125 5126
}

/**
 *	sata_scr_write - write SCR register of the specified port
5127
 *	@link: ATA link to write SCR for
5128 5129 5130
 *	@reg: SCR to write
 *	@val: value to write
 *
5131
 *	Write @val to SCR register @reg of @link.  This function is
5132 5133
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5134 5135
 *
 *	LOCKING:
5136
 *	None if @link is ap->link.  Kernel thread context otherwise.
5137 5138 5139 5140
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5141
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5142
{
5143 5144
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
T
Tejun Heo 已提交
5145
			return link->ap->ops->scr_write(link, reg, val);
5146 5147
		return -EOPNOTSUPP;
	}
5148

5149
	return sata_pmp_scr_write(link, reg, val);
5150 5151 5152 5153
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5154
 *	@link: ATA link to write SCR for
5155 5156 5157 5158 5159 5160 5161
 *	@reg: SCR to write
 *	@val: value to write
 *
 *	This function is identical to sata_scr_write() except that this
 *	function performs flush after writing to the register.
 *
 *	LOCKING:
5162
 *	None if @link is ap->link.  Kernel thread context otherwise.
5163 5164 5165 5166
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5167
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5168
{
5169 5170
	if (ata_is_host_link(link)) {
		int rc;
5171

5172
		if (sata_scr_valid(link)) {
T
Tejun Heo 已提交
5173
			rc = link->ap->ops->scr_write(link, reg, val);
5174
			if (rc == 0)
T
Tejun Heo 已提交
5175
				rc = link->ap->ops->scr_read(link, reg, &val);
5176 5177 5178
			return rc;
		}
		return -EOPNOTSUPP;
5179
	}
5180 5181

	return sata_pmp_scr_write(link, reg, val);
5182 5183 5184
}

/**
T
Tejun Heo 已提交
5185
 *	ata_phys_link_online - test whether the given link is online
5186
 *	@link: ATA link to test
5187
 *
5188 5189 5190
 *	Test whether @link is online.  Note that this function returns
 *	0 if online status of @link cannot be obtained, so
 *	ata_link_online(link) != !ata_link_offline(link).
5191 5192 5193 5194 5195
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5196
 *	True if the port online status is available and online.
5197
 */
T
Tejun Heo 已提交
5198
bool ata_phys_link_online(struct ata_link *link)
5199 5200 5201
{
	u32 sstatus;

5202
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5203
	    ata_sstatus_online(sstatus))
5204 5205
		return true;
	return false;
5206 5207 5208
}

/**
T
Tejun Heo 已提交
5209
 *	ata_phys_link_offline - test whether the given link is offline
5210
 *	@link: ATA link to test
5211
 *
5212 5213 5214
 *	Test whether @link is offline.  Note that this function
 *	returns 0 if offline status of @link cannot be obtained, so
 *	ata_link_online(link) != !ata_link_offline(link).
5215 5216 5217 5218 5219
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5220
 *	True if the port offline status is available and offline.
5221
 */
T
Tejun Heo 已提交
5222
bool ata_phys_link_offline(struct ata_link *link)
5223 5224 5225
{
	u32 sstatus;

5226
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5227
	    !ata_sstatus_online(sstatus))
5228 5229
		return true;
	return false;
5230
}
E
Edward Falk 已提交
5231

T
Tejun Heo 已提交
5232 5233 5234 5235 5236 5237 5238 5239 5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283
/**
 *	ata_link_online - test whether the given link is online
 *	@link: ATA link to test
 *
 *	Test whether @link is online.  This is identical to
 *	ata_phys_link_online() when there's no slave link.  When
 *	there's a slave link, this function should only be called on
 *	the master link and will return true if any of M/S links is
 *	online.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	True if the port online status is available and online.
 */
bool ata_link_online(struct ata_link *link)
{
	struct ata_link *slave = link->ap->slave_link;

	WARN_ON(link == slave);	/* shouldn't be called on slave link */

	return ata_phys_link_online(link) ||
		(slave && ata_phys_link_online(slave));
}

/**
 *	ata_link_offline - test whether the given link is offline
 *	@link: ATA link to test
 *
 *	Test whether @link is offline.  This is identical to
 *	ata_phys_link_offline() when there's no slave link.  When
 *	there's a slave link, this function should only be called on
 *	the master link and will return true if both M/S links are
 *	offline.
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	True if the port offline status is available and offline.
 */
bool ata_link_offline(struct ata_link *link)
{
	struct ata_link *slave = link->ap->slave_link;

	WARN_ON(link == slave);	/* shouldn't be called on slave link */

	return ata_phys_link_offline(link) &&
		(!slave || ata_phys_link_offline(slave));
}

5284
#ifdef CONFIG_PM
L
Lin Ming 已提交
5285
static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
J
Jeff Garzik 已提交
5286
			       unsigned int action, unsigned int ehi_flags,
5287
			       int *async)
5288
{
L
Lin Ming 已提交
5289
	struct ata_link *link;
5290
	unsigned long flags;
5291
	int rc = 0;
5292

L
Lin Ming 已提交
5293 5294 5295 5296
	/* Previous resume operation might still be in
	 * progress.  Wait for PM_PENDING to clear.
	 */
	if (ap->pflags & ATA_PFLAG_PM_PENDING) {
5297 5298 5299 5300
		if (async) {
			*async = -EAGAIN;
			return 0;
		}
L
Lin Ming 已提交
5301 5302 5303
		ata_port_wait_eh(ap);
		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
	}
5304

L
Lin Ming 已提交
5305 5306
	/* request PM ops to EH */
	spin_lock_irqsave(ap->lock, flags);
5307

L
Lin Ming 已提交
5308
	ap->pm_mesg = mesg;
5309 5310 5311
	if (async)
		ap->pm_result = async;
	else
L
Lin Ming 已提交
5312
		ap->pm_result = &rc;
5313

L
Lin Ming 已提交
5314 5315 5316 5317 5318
	ap->pflags |= ATA_PFLAG_PM_PENDING;
	ata_for_each_link(link, ap, HOST_FIRST) {
		link->eh_info.action |= action;
		link->eh_info.flags |= ehi_flags;
	}
5319

L
Lin Ming 已提交
5320
	ata_port_schedule_eh(ap);
5321

L
Lin Ming 已提交
5322
	spin_unlock_irqrestore(ap->lock, flags);
5323

L
Lin Ming 已提交
5324
	/* wait and check result */
5325
	if (!async) {
L
Lin Ming 已提交
5326 5327
		ata_port_wait_eh(ap);
		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5328 5329
	}

L
Lin Ming 已提交
5330
	return rc;
5331 5332
}

5333
static int __ata_port_suspend_common(struct ata_port *ap, pm_message_t mesg, int *async)
L
Lin Ming 已提交
5334
{
L
Lin Ming 已提交
5335
	unsigned int ehi_flags = ATA_EHI_QUIET;
L
Lin Ming 已提交
5336 5337
	int rc;

L
Lin Ming 已提交
5338 5339 5340 5341 5342 5343 5344 5345 5346 5347 5348
	/*
	 * On some hardware, device fails to respond after spun down
	 * for suspend.  As the device won't be used before being
	 * resumed, we don't need to touch the device.  Ask EH to skip
	 * the usual stuff and proceed directly to suspend.
	 *
	 * http://thread.gmane.org/gmane.linux.ide/46764
	 */
	if (mesg.event == PM_EVENT_SUSPEND)
		ehi_flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_NO_RECOVERY;

5349
	rc = ata_port_request_pm(ap, mesg, 0, ehi_flags, async);
L
Lin Ming 已提交
5350 5351 5352
	return rc;
}

5353 5354 5355 5356 5357 5358 5359
static int ata_port_suspend_common(struct device *dev, pm_message_t mesg)
{
	struct ata_port *ap = to_ata_port(dev);

	return __ata_port_suspend_common(ap, mesg, NULL);
}

L
Lin Ming 已提交
5360 5361 5362 5363 5364
static int ata_port_suspend(struct device *dev)
{
	if (pm_runtime_suspended(dev))
		return 0;

L
Lin Ming 已提交
5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377 5378 5379 5380 5381
	return ata_port_suspend_common(dev, PMSG_SUSPEND);
}

static int ata_port_do_freeze(struct device *dev)
{
	if (pm_runtime_suspended(dev))
		pm_runtime_resume(dev);

	return ata_port_suspend_common(dev, PMSG_FREEZE);
}

static int ata_port_poweroff(struct device *dev)
{
	if (pm_runtime_suspended(dev))
		return 0;

	return ata_port_suspend_common(dev, PMSG_HIBERNATE);
L
Lin Ming 已提交
5382 5383
}

5384
static int __ata_port_resume_common(struct ata_port *ap, int *async)
L
Lin Ming 已提交
5385 5386 5387 5388
{
	int rc;

	rc = ata_port_request_pm(ap, PMSG_ON, ATA_EH_RESET,
5389
		ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, async);
L
Lin Ming 已提交
5390 5391 5392
	return rc;
}

5393 5394 5395 5396 5397 5398 5399
static int ata_port_resume_common(struct device *dev)
{
	struct ata_port *ap = to_ata_port(dev);

	return __ata_port_resume_common(ap, NULL);
}

5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413
static int ata_port_resume(struct device *dev)
{
	int rc;

	rc = ata_port_resume_common(dev);
	if (!rc) {
		pm_runtime_disable(dev);
		pm_runtime_set_active(dev);
		pm_runtime_enable(dev);
	}

	return rc;
}

5414 5415 5416 5417 5418
static int ata_port_runtime_idle(struct device *dev)
{
	return pm_runtime_suspend(dev);
}

L
Lin Ming 已提交
5419 5420 5421
static const struct dev_pm_ops ata_port_pm_ops = {
	.suspend = ata_port_suspend,
	.resume = ata_port_resume,
L
Lin Ming 已提交
5422 5423 5424 5425
	.freeze = ata_port_do_freeze,
	.thaw = ata_port_resume,
	.poweroff = ata_port_poweroff,
	.restore = ata_port_resume,
5426

L
Lin Ming 已提交
5427
	.runtime_suspend = ata_port_suspend,
5428
	.runtime_resume = ata_port_resume_common,
5429
	.runtime_idle = ata_port_runtime_idle,
L
Lin Ming 已提交
5430 5431
};

5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442 5443 5444 5445 5446 5447 5448 5449
/* sas ports don't participate in pm runtime management of ata_ports,
 * and need to resume ata devices at the domain level, not the per-port
 * level. sas suspend/resume is async to allow parallel port recovery
 * since sas has multiple ata_port instances per Scsi_Host.
 */
int ata_sas_port_async_suspend(struct ata_port *ap, int *async)
{
	return __ata_port_suspend_common(ap, PMSG_SUSPEND, async);
}
EXPORT_SYMBOL_GPL(ata_sas_port_async_suspend);

int ata_sas_port_async_resume(struct ata_port *ap, int *async)
{
	return __ata_port_resume_common(ap, async);
}
EXPORT_SYMBOL_GPL(ata_sas_port_async_resume);


5450
/**
J
Jeff Garzik 已提交
5451 5452
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5453 5454
 *	@mesg: PM message
 *
L
Lin Ming 已提交
5455
 *	Suspend @host.  Actual operation is performed by port suspend.
5456
 */
J
Jeff Garzik 已提交
5457
int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
5458
{
L
Lin Ming 已提交
5459 5460
	host->dev->power.power_state = mesg;
	return 0;
5461 5462 5463
}

/**
J
Jeff Garzik 已提交
5464 5465
 *	ata_host_resume - resume host
 *	@host: host to resume
5466
 *
L
Lin Ming 已提交
5467
 *	Resume @host.  Actual operation is performed by port resume.
5468
 */
J
Jeff Garzik 已提交
5469
void ata_host_resume(struct ata_host *host)
5470
{
5471
	host->dev->power.power_state = PMSG_ON;
5472
}
5473
#endif
5474

L
Lin Ming 已提交
5475 5476 5477 5478 5479 5480 5481
struct device_type ata_port_type = {
	.name = "ata_port",
#ifdef CONFIG_PM
	.pm = &ata_port_pm_ops,
#endif
};

5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492
/**
 *	ata_dev_init - Initialize an ata_device structure
 *	@dev: Device structure to initialize
 *
 *	Initialize @dev in preparation for probing.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
void ata_dev_init(struct ata_device *dev)
{
T
Tejun Heo 已提交
5493
	struct ata_link *link = ata_dev_phys_link(dev);
T
Tejun Heo 已提交
5494
	struct ata_port *ap = link->ap;
5495 5496
	unsigned long flags;

T
Tejun Heo 已提交
5497
	/* SATA spd limit is bound to the attached device, reset together */
T
Tejun Heo 已提交
5498 5499
	link->sata_spd_limit = link->hw_sata_spd_limit;
	link->sata_spd = 0;
5500

5501 5502
	/* High bits of dev->flags are used to record warm plug
	 * requests which occur asynchronously.  Synchronize using
J
Jeff Garzik 已提交
5503
	 * host lock.
5504
	 */
5505
	spin_lock_irqsave(ap->lock, flags);
5506
	dev->flags &= ~ATA_DFLAG_INIT_MASK;
5507
	dev->horkage = 0;
5508
	spin_unlock_irqrestore(ap->lock, flags);
5509

5510 5511
	memset((void *)dev + ATA_DEVICE_CLEAR_BEGIN, 0,
	       ATA_DEVICE_CLEAR_END - ATA_DEVICE_CLEAR_BEGIN);
5512 5513 5514 5515 5516
	dev->pio_mask = UINT_MAX;
	dev->mwdma_mask = UINT_MAX;
	dev->udma_mask = UINT_MAX;
}

5517 5518 5519 5520
/**
 *	ata_link_init - Initialize an ata_link structure
 *	@ap: ATA port link is attached to
 *	@link: Link structure to initialize
T
Tejun Heo 已提交
5521
 *	@pmp: Port multiplier port number
5522 5523 5524 5525 5526 5527
 *
 *	Initialize @link.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 */
5528
void ata_link_init(struct ata_port *ap, struct ata_link *link, int pmp)
5529 5530 5531 5532
{
	int i;

	/* clear everything except for devices */
G
Gwendal Grignou 已提交
5533 5534
	memset((void *)link + ATA_LINK_CLEAR_BEGIN, 0,
	       ATA_LINK_CLEAR_END - ATA_LINK_CLEAR_BEGIN);
5535 5536

	link->ap = ap;
T
Tejun Heo 已提交
5537
	link->pmp = pmp;
5538 5539 5540 5541 5542 5543 5544 5545 5546
	link->active_tag = ATA_TAG_POISON;
	link->hw_sata_spd_limit = UINT_MAX;

	/* can't use iterator, ap isn't initialized yet */
	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		struct ata_device *dev = &link->device[i];

		dev->link = link;
		dev->devno = dev - link->device;
T
Tejun Heo 已提交
5547 5548 5549
#ifdef CONFIG_ATA_ACPI
		dev->gtf_filter = ata_acpi_gtf_filter;
#endif
5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566
		ata_dev_init(dev);
	}
}

/**
 *	sata_link_init_spd - Initialize link->sata_spd_limit
 *	@link: Link to configure sata_spd_limit for
 *
 *	Initialize @link->[hw_]sata_spd_limit to the currently
 *	configured value.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
5567
int sata_link_init_spd(struct ata_link *link)
5568
{
5569
	u8 spd;
5570 5571
	int rc;

T
Tejun Heo 已提交
5572
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5573 5574 5575
	if (rc)
		return rc;

T
Tejun Heo 已提交
5576
	spd = (link->saved_scontrol >> 4) & 0xf;
5577 5578 5579
	if (spd)
		link->hw_sata_spd_limit &= (1 << spd) - 1;

5580
	ata_force_link_limits(link);
5581

5582 5583 5584 5585 5586
	link->sata_spd_limit = link->hw_sata_spd_limit;

	return 0;
}

L
Linus Torvalds 已提交
5587
/**
5588 5589
 *	ata_port_alloc - allocate and initialize basic ATA port resources
 *	@host: ATA host this allocated port belongs to
L
Linus Torvalds 已提交
5590
 *
5591 5592 5593 5594
 *	Allocate and initialize basic ATA port resources.
 *
 *	RETURNS:
 *	Allocate ATA port on success, NULL on failure.
J
Jeff Garzik 已提交
5595
 *
L
Linus Torvalds 已提交
5596
 *	LOCKING:
5597
 *	Inherited from calling layer (may sleep).
L
Linus Torvalds 已提交
5598
 */
5599
struct ata_port *ata_port_alloc(struct ata_host *host)
L
Linus Torvalds 已提交
5600
{
5601
	struct ata_port *ap;
L
Linus Torvalds 已提交
5602

5603 5604 5605 5606 5607
	DPRINTK("ENTER\n");

	ap = kzalloc(sizeof(*ap), GFP_KERNEL);
	if (!ap)
		return NULL;
5608

5609
	ap->pflags |= ATA_PFLAG_INITIALIZING | ATA_PFLAG_FROZEN;
J
Jeff Garzik 已提交
5610
	ap->lock = &host->lock;
5611
	ap->print_id = -1;
J
Jeff Garzik 已提交
5612
	ap->host = host;
5613
	ap->dev = host->dev;
5614 5615 5616 5617 5618 5619

#if defined(ATA_VERBOSE_DEBUG)
	/* turn on all debugging levels */
	ap->msg_enable = 0x00FF;
#elif defined(ATA_DEBUG)
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_INFO | ATA_MSG_CTL | ATA_MSG_WARN | ATA_MSG_ERR;
T
Tejun Heo 已提交
5620
#else
5621
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5622
#endif
L
Linus Torvalds 已提交
5623

5624
	mutex_init(&ap->scsi_scan_mutex);
5625 5626
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5627
	INIT_LIST_HEAD(&ap->eh_done_q);
5628
	init_waitqueue_head(&ap->eh_wait_q);
5629
	init_completion(&ap->park_req_pending);
T
Tejun Heo 已提交
5630 5631 5632
	init_timer_deferrable(&ap->fastdrain_timer);
	ap->fastdrain_timer.function = ata_eh_fastdrain_timerfn;
	ap->fastdrain_timer.data = (unsigned long)ap;
L
Linus Torvalds 已提交
5633

5634 5635
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5636
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5637 5638 5639 5640 5641

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif
5642 5643
	ata_sff_port_init(ap);

L
Linus Torvalds 已提交
5644 5645 5646
	return ap;
}

5647 5648 5649 5650 5651
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5652 5653 5654
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5655 5656 5657 5658
		if (!ap)
			continue;

		if (ap->scsi_host)
5659 5660
			scsi_host_put(ap->scsi_host);

5661
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5662
		kfree(ap->slave_link);
5663
		kfree(ap);
5664 5665 5666
		host->ports[i] = NULL;
	}

5667
	dev_set_drvdata(gendev, NULL);
5668 5669
}

5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711
/**
 *	ata_host_alloc - allocate and init basic ATA host resources
 *	@dev: generic device this host is associated with
 *	@max_ports: maximum number of ATA ports associated with this host
 *
 *	Allocate and initialize basic ATA host resources.  LLD calls
 *	this function to allocate a host, initializes it fully and
 *	attaches it using ata_host_register().
 *
 *	@max_ports ports are allocated and host->n_ports is
 *	initialized to @max_ports.  The caller is allowed to decrease
 *	host->n_ports before calling ata_host_register().  The unused
 *	ports will be automatically freed on registration.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc(struct device *dev, int max_ports)
{
	struct ata_host *host;
	size_t sz;
	int i;

	DPRINTK("ENTER\n");

	if (!devres_open_group(dev, NULL, GFP_KERNEL))
		return NULL;

	/* alloc a container for our list of ATA ports (buses) */
	sz = sizeof(struct ata_host) + (max_ports + 1) * sizeof(void *);
	/* alloc a container for our list of ATA ports (buses) */
	host = devres_alloc(ata_host_release, sz, GFP_KERNEL);
	if (!host)
		goto err_out;

	devres_add(dev, host);
	dev_set_drvdata(dev, host);

	spin_lock_init(&host->lock);
5712
	mutex_init(&host->eh_mutex);
5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735
	host->dev = dev;
	host->n_ports = max_ports;

	/* allocate ports bound to this host */
	for (i = 0; i < max_ports; i++) {
		struct ata_port *ap;

		ap = ata_port_alloc(host);
		if (!ap)
			goto err_out;

		ap->port_no = i;
		host->ports[i] = ap;
	}

	devres_remove_group(dev, NULL);
	return host;

 err_out:
	devres_release_group(dev, NULL);
	return NULL;
}

5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746 5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773
/**
 *	ata_host_alloc_pinfo - alloc host and init with port_info array
 *	@dev: generic device this host is associated with
 *	@ppi: array of ATA port_info to initialize host with
 *	@n_ports: number of ATA ports attached to this host
 *
 *	Allocate ATA host and initialize with info from @ppi.  If NULL
 *	terminated, @ppi may contain fewer entries than @n_ports.  The
 *	last entry will be used for the remaining ports.
 *
 *	RETURNS:
 *	Allocate ATA host on success, NULL on failure.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 */
struct ata_host *ata_host_alloc_pinfo(struct device *dev,
				      const struct ata_port_info * const * ppi,
				      int n_ports)
{
	const struct ata_port_info *pi;
	struct ata_host *host;
	int i, j;

	host = ata_host_alloc(dev, n_ports);
	if (!host)
		return NULL;

	for (i = 0, j = 0, pi = NULL; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		if (ppi[j])
			pi = ppi[j++];

		ap->pio_mask = pi->pio_mask;
		ap->mwdma_mask = pi->mwdma_mask;
		ap->udma_mask = pi->udma_mask;
		ap->flags |= pi->flags;
5774
		ap->link.flags |= pi->link_flags;
5775 5776 5777 5778 5779 5780 5781 5782 5783
		ap->ops = pi->port_ops;

		if (!host->ops && (pi->port_ops != &ata_dummy_port_ops))
			host->ops = pi->port_ops;
	}

	return host;
}

T
Tejun Heo 已提交
5784 5785 5786 5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845
/**
 *	ata_slave_link_init - initialize slave link
 *	@ap: port to initialize slave link for
 *
 *	Create and initialize slave link for @ap.  This enables slave
 *	link handling on the port.
 *
 *	In libata, a port contains links and a link contains devices.
 *	There is single host link but if a PMP is attached to it,
 *	there can be multiple fan-out links.  On SATA, there's usually
 *	a single device connected to a link but PATA and SATA
 *	controllers emulating TF based interface can have two - master
 *	and slave.
 *
 *	However, there are a few controllers which don't fit into this
 *	abstraction too well - SATA controllers which emulate TF
 *	interface with both master and slave devices but also have
 *	separate SCR register sets for each device.  These controllers
 *	need separate links for physical link handling
 *	(e.g. onlineness, link speed) but should be treated like a
 *	traditional M/S controller for everything else (e.g. command
 *	issue, softreset).
 *
 *	slave_link is libata's way of handling this class of
 *	controllers without impacting core layer too much.  For
 *	anything other than physical link handling, the default host
 *	link is used for both master and slave.  For physical link
 *	handling, separate @ap->slave_link is used.  All dirty details
 *	are implemented inside libata core layer.  From LLD's POV, the
 *	only difference is that prereset, hardreset and postreset are
 *	called once more for the slave link, so the reset sequence
 *	looks like the following.
 *
 *	prereset(M) -> prereset(S) -> hardreset(M) -> hardreset(S) ->
 *	softreset(M) -> postreset(M) -> postreset(S)
 *
 *	Note that softreset is called only for the master.  Softreset
 *	resets both M/S by definition, so SRST on master should handle
 *	both (the standard method will work just fine).
 *
 *	LOCKING:
 *	Should be called before host is registered.
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
int ata_slave_link_init(struct ata_port *ap)
{
	struct ata_link *link;

	WARN_ON(ap->slave_link);
	WARN_ON(ap->flags & ATA_FLAG_PMP);

	link = kzalloc(sizeof(*link), GFP_KERNEL);
	if (!link)
		return -ENOMEM;

	ata_link_init(ap, link, 1);
	ap->slave_link = link;
	return 0;
}

5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863
static void ata_host_stop(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

	WARN_ON(!(host->flags & ATA_HOST_STARTED));

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		if (ap->ops->port_stop)
			ap->ops->port_stop(ap);
	}

	if (host->ops->host_stop)
		host->ops->host_stop(host);
}

5864 5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885
/**
 *	ata_finalize_port_ops - finalize ata_port_operations
 *	@ops: ata_port_operations to finalize
 *
 *	An ata_port_operations can inherit from another ops and that
 *	ops can again inherit from another.  This can go on as many
 *	times as necessary as long as there is no loop in the
 *	inheritance chain.
 *
 *	Ops tables are finalized when the host is started.  NULL or
 *	unspecified entries are inherited from the closet ancestor
 *	which has the method and the entry is populated with it.
 *	After finalization, the ops table directly points to all the
 *	methods and ->inherits is no longer necessary and cleared.
 *
 *	Using ATA_OP_NULL, inheriting ops can force a method to NULL.
 *
 *	LOCKING:
 *	None.
 */
static void ata_finalize_port_ops(struct ata_port_operations *ops)
{
5886
	static DEFINE_SPINLOCK(lock);
5887 5888 5889 5890 5891 5892 5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912 5913
	const struct ata_port_operations *cur;
	void **begin = (void **)ops;
	void **end = (void **)&ops->inherits;
	void **pp;

	if (!ops || !ops->inherits)
		return;

	spin_lock(&lock);

	for (cur = ops->inherits; cur; cur = cur->inherits) {
		void **inherit = (void **)cur;

		for (pp = begin; pp < end; pp++, inherit++)
			if (!*pp)
				*pp = *inherit;
	}

	for (pp = begin; pp < end; pp++)
		if (IS_ERR(*pp))
			*pp = NULL;

	ops->inherits = NULL;

	spin_unlock(&lock);
}

5914 5915 5916 5917 5918 5919 5920
/**
 *	ata_host_start - start and freeze ports of an ATA host
 *	@host: ATA host to start ports for
 *
 *	Start and then freeze ports of @host.  Started status is
 *	recorded in host->flags, so this function can be called
 *	multiple times.  Ports are guaranteed to get started only
5921 5922
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5923 5924 5925 5926 5927 5928 5929 5930 5931
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 if all ports are started successfully, -errno otherwise.
 */
int ata_host_start(struct ata_host *host)
{
5932 5933
	int have_stop = 0;
	void *start_dr = NULL;
5934 5935 5936 5937 5938
	int i, rc;

	if (host->flags & ATA_HOST_STARTED)
		return 0;

5939 5940
	ata_finalize_port_ops(host->ops);

5941 5942 5943
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5944 5945
		ata_finalize_port_ops(ap->ops);

5946 5947 5948
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964
		if (ap->ops->port_stop)
			have_stop = 1;
	}

	if (host->ops->host_stop)
		have_stop = 1;

	if (have_stop) {
		start_dr = devres_alloc(ata_host_stop, 0, GFP_KERNEL);
		if (!start_dr)
			return -ENOMEM;
	}

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5965 5966 5967
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5968
				if (rc != -ENODEV)
5969 5970 5971
					dev_err(host->dev,
						"failed to start port %d (errno=%d)\n",
						i, rc);
5972 5973 5974 5975 5976 5977
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5978 5979
	if (start_dr)
		devres_add(host->dev, start_dr);
5980 5981 5982 5983 5984 5985 5986 5987 5988 5989
	host->flags |= ATA_HOST_STARTED;
	return 0;

 err_out:
	while (--i >= 0) {
		struct ata_port *ap = host->ports[i];

		if (ap->ops->port_stop)
			ap->ops->port_stop(ap);
	}
5990
	devres_free(start_dr);
5991 5992 5993
	return rc;
}

5994
/**
5995
 *	ata_sas_host_init - Initialize a host struct for sas (ipr, libsas)
J
Jeff Garzik 已提交
5996 5997 5998
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@ops:	port_ops
5999 6000
 *
 */
J
Jeff Garzik 已提交
6001
void ata_host_init(struct ata_host *host, struct device *dev,
6002
		   struct ata_port_operations *ops)
6003
{
J
Jeff Garzik 已提交
6004
	spin_lock_init(&host->lock);
6005
	mutex_init(&host->eh_mutex);
J
Jeff Garzik 已提交
6006 6007
	host->dev = dev;
	host->ops = ops;
6008 6009
}

D
Dan Williams 已提交
6010
void __ata_port_probe(struct ata_port *ap)
6011
{
D
Dan Williams 已提交
6012 6013
	struct ata_eh_info *ehi = &ap->link.eh_info;
	unsigned long flags;
6014

D
Dan Williams 已提交
6015 6016
	/* kick EH for boot probing */
	spin_lock_irqsave(ap->lock, flags);
6017

D
Dan Williams 已提交
6018 6019 6020
	ehi->probe_mask |= ATA_ALL_DEVICES;
	ehi->action |= ATA_EH_RESET;
	ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6021

D
Dan Williams 已提交
6022 6023 6024
	ap->pflags &= ~ATA_PFLAG_INITIALIZING;
	ap->pflags |= ATA_PFLAG_LOADING;
	ata_port_schedule_eh(ap);
6025

D
Dan Williams 已提交
6026 6027
	spin_unlock_irqrestore(ap->lock, flags);
}
6028

D
Dan Williams 已提交
6029 6030 6031
int ata_port_probe(struct ata_port *ap)
{
	int rc = 0;
6032

D
Dan Williams 已提交
6033 6034
	if (ap->ops->error_handler) {
		__ata_port_probe(ap);
6035 6036 6037 6038 6039 6040
		ata_port_wait_eh(ap);
	} else {
		DPRINTK("ata%u: bus probe begin\n", ap->print_id);
		rc = ata_bus_probe(ap);
		DPRINTK("ata%u: bus probe end\n", ap->print_id);
	}
6041 6042 6043 6044 6045 6046 6047
	return rc;
}


static void async_port_probe(void *data, async_cookie_t cookie)
{
	struct ata_port *ap = data;
6048

6049 6050 6051 6052 6053 6054 6055 6056 6057 6058 6059
	/*
	 * If we're not allowed to scan this host in parallel,
	 * we need to wait until all previous scans have completed
	 * before going further.
	 * Jeff Garzik says this is only within a controller, so we
	 * don't need to wait for port 0, only for later ports.
	 */
	if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
		async_synchronize_cookie(cookie);

	(void)ata_port_probe(ap);
6060 6061 6062 6063 6064

	/* in order to keep device order, we need to synchronize at this point */
	async_synchronize_cookie(cookie);

	ata_scsi_scan_host(ap, 1);
6065
}
6066

6067 6068 6069 6070 6071 6072 6073 6074 6075 6076 6077 6078 6079 6080 6081 6082 6083 6084 6085 6086 6087 6088
/**
 *	ata_host_register - register initialized ATA host
 *	@host: ATA host to register
 *	@sht: template for SCSI host
 *
 *	Register initialized ATA host.  @host is allocated using
 *	ata_host_alloc() and fully initialized by LLD.  This function
 *	starts ports, registers @host with ATA and SCSI layers and
 *	probe registered devices.
 *
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

	/* host must have been started */
	if (!(host->flags & ATA_HOST_STARTED)) {
6089
		dev_err(host->dev, "BUG: trying to register unstarted host\n");
6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100
		WARN_ON(1);
		return -EINVAL;
	}

	/* Blow away unused ports.  This happens when LLD can't
	 * determine the exact number of ports to allocate at
	 * allocation time.
	 */
	for (i = host->n_ports; host->ports[i]; i++)
		kfree(host->ports[i]);

6101 6102 6103
	/* track host controller */
	host->host_id = atomic_inc_return(&host_print_id);

6104 6105
	/* give ports names and add SCSI hosts */
	for (i = 0; i < host->n_ports; i++)
D
Dan Williams 已提交
6106
		host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
6107

6108

G
Gwendal Grignou 已提交
6109 6110 6111 6112 6113 6114 6115 6116
	/* Create associated sysfs transport objects  */
	for (i = 0; i < host->n_ports; i++) {
		rc = ata_tport_add(host->dev,host->ports[i]);
		if (rc) {
			goto err_tadd;
		}
	}

6117 6118
	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
G
Gwendal Grignou 已提交
6119
		goto err_tadd;
6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130

	/* set cable, sata_spd_limit and report */
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
		unsigned long xfer_mask;

		/* set SATA cable type if still unset */
		if (ap->cbl == ATA_CBL_NONE && (ap->flags & ATA_FLAG_SATA))
			ap->cbl = ATA_CBL_SATA;

		/* init sata_spd_limit to the current value */
6131
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6132 6133
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6134

6135
		/* print per-port info to dmesg */
6136 6137 6138
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6139
		if (!ata_port_is_dummy(ap)) {
6140 6141 6142 6143
			ata_port_info(ap, "%cATA max %s %s\n",
				      (ap->flags & ATA_FLAG_SATA) ? 'S' : 'P',
				      ata_mode_string(xfer_mask),
				      ap->link.eh_info.desc);
6144 6145
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6146
			ata_port_info(ap, "DUMMY\n");
6147 6148
	}

V
Vegard Nossum 已提交
6149
	/* perform each probe asynchronously */
6150 6151
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6152
		async_schedule(async_port_probe, ap);
6153 6154 6155
	}

	return 0;
G
Gwendal Grignou 已提交
6156 6157 6158 6159 6160 6161 6162

 err_tadd:
	while (--i >= 0) {
		ata_tport_delete(host->ports[i]);
	}
	return rc;

6163 6164
}

6165 6166 6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177
/**
 *	ata_host_activate - start host, request IRQ and register it
 *	@host: target ATA host
 *	@irq: IRQ to request
 *	@irq_handler: irq_handler used when requesting IRQ
 *	@irq_flags: irq_flags used when requesting IRQ
 *	@sht: scsi_host_template to use when registering the host
 *
 *	After allocating an ATA host and initializing it, most libata
 *	LLDs perform three steps to activate the host - start host,
 *	request IRQ and register it.  This helper takes necessasry
 *	arguments and performs the three steps in one go.
 *
6178 6179 6180 6181
 *	An invalid IRQ skips the IRQ registration and expects the host to
 *	have set polling mode on the port. In this case, @irq_handler
 *	should be NULL.
 *
6182 6183 6184 6185 6186 6187 6188 6189 6190 6191
 *	LOCKING:
 *	Inherited from calling layer (may sleep).
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
int ata_host_activate(struct ata_host *host, int irq,
		      irq_handler_t irq_handler, unsigned long irq_flags,
		      struct scsi_host_template *sht)
{
6192
	int i, rc;
6193 6194 6195 6196 6197

	rc = ata_host_start(host);
	if (rc)
		return rc;

6198 6199 6200 6201 6202 6203
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6204 6205 6206 6207 6208
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
			      dev_driver_string(host->dev), host);
	if (rc)
		return rc;

6209 6210
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
T
Tejun Heo 已提交
6211

6212 6213 6214 6215 6216 6217 6218 6219
	rc = ata_host_register(host, sht);
	/* if failed, just free the IRQ and leave ports alone */
	if (rc)
		devm_free_irq(host->dev, irq, host);

	return rc;
}

6220 6221 6222 6223 6224 6225 6226 6227 6228 6229 6230
/**
 *	ata_port_detach - Detach ATA port in prepration of device removal
 *	@ap: ATA port to be detached
 *
 *	Detach all ATA devices and the associated SCSI devices of @ap;
 *	then, remove the associated SCSI host.  @ap is guaranteed to
 *	be quiescent on return from this function.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
6231
static void ata_port_detach(struct ata_port *ap)
6232 6233 6234 6235
{
	unsigned long flags;

	if (!ap->ops->error_handler)
6236
		goto skip_eh;
6237 6238

	/* tell EH we're leaving & flush EH */
6239
	spin_lock_irqsave(ap->lock, flags);
6240
	ap->pflags |= ATA_PFLAG_UNLOADING;
T
Tejun Heo 已提交
6241
	ata_port_schedule_eh(ap);
6242
	spin_unlock_irqrestore(ap->lock, flags);
6243

T
Tejun Heo 已提交
6244
	/* wait till EH commits suicide */
6245 6246
	ata_port_wait_eh(ap);

T
Tejun Heo 已提交
6247 6248
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6249

6250
	cancel_delayed_work_sync(&ap->hotplug_task);
6251

6252
 skip_eh:
G
Gwendal Grignou 已提交
6253 6254 6255 6256 6257 6258 6259
	if (ap->pmp_link) {
		int i;
		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
			ata_tlink_delete(&ap->pmp_link[i]);
	}
	ata_tport_delete(ap);

6260
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6261
	scsi_remove_host(ap->scsi_host);
6262 6263
}

T
Tejun Heo 已提交
6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275 6276 6277 6278
/**
 *	ata_host_detach - Detach all ports of an ATA host
 *	@host: Host to detach
 *
 *	Detach all ports of @host.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
void ata_host_detach(struct ata_host *host)
{
	int i;

	for (i = 0; i < host->n_ports; i++)
		ata_port_detach(host->ports[i]);
6279 6280 6281

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
T
Tejun Heo 已提交
6282 6283
}

6284 6285
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6286 6287 6288 6289
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
T
Tejun Heo 已提交
6290 6291 6292
 *	PCI layer indicates to libata via this hook that hot-unplug or
 *	module unload event has occurred.  Detach all ports.  Resource
 *	release is handled via devres.
L
Linus Torvalds 已提交
6293 6294 6295 6296
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6297
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6298
{
6299
	struct ata_host *host = pci_get_drvdata(pdev);
L
Linus Torvalds 已提交
6300

T
Tejun Heo 已提交
6301
	ata_host_detach(host);
L
Linus Torvalds 已提交
6302 6303 6304
}

/* move to PCI subsystem */
J
Jeff Garzik 已提交
6305
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336
{
	unsigned long tmp = 0;

	switch (bits->width) {
	case 1: {
		u8 tmp8 = 0;
		pci_read_config_byte(pdev, bits->reg, &tmp8);
		tmp = tmp8;
		break;
	}
	case 2: {
		u16 tmp16 = 0;
		pci_read_config_word(pdev, bits->reg, &tmp16);
		tmp = tmp16;
		break;
	}
	case 4: {
		u32 tmp32 = 0;
		pci_read_config_dword(pdev, bits->reg, &tmp32);
		tmp = tmp32;
		break;
	}

	default:
		return -EINVAL;
	}

	tmp &= bits->mask;

	return (tmp == bits->val) ? 1 : 0;
}
J
Jens Axboe 已提交
6337

6338
#ifdef CONFIG_PM
6339
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
J
Jens Axboe 已提交
6340 6341
{
	pci_save_state(pdev);
6342
	pci_disable_device(pdev);
6343

6344
	if (mesg.event & PM_EVENT_SLEEP)
6345
		pci_set_power_state(pdev, PCI_D3hot);
J
Jens Axboe 已提交
6346 6347
}

6348
int ata_pci_device_do_resume(struct pci_dev *pdev)
J
Jens Axboe 已提交
6349
{
6350 6351
	int rc;

J
Jens Axboe 已提交
6352 6353
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6354

T
Tejun Heo 已提交
6355
	rc = pcim_enable_device(pdev);
6356
	if (rc) {
6357 6358
		dev_err(&pdev->dev,
			"failed to enable device after resume (%d)\n", rc);
6359 6360 6361
		return rc;
	}

J
Jens Axboe 已提交
6362
	pci_set_master(pdev);
6363
	return 0;
6364 6365
}

6366
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6367
{
6368
	struct ata_host *host = pci_get_drvdata(pdev);
6369 6370
	int rc = 0;

J
Jeff Garzik 已提交
6371
	rc = ata_host_suspend(host, mesg);
6372 6373 6374
	if (rc)
		return rc;

6375
	ata_pci_device_do_suspend(pdev, mesg);
6376 6377 6378 6379 6380 6381

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
6382
	struct ata_host *host = pci_get_drvdata(pdev);
6383
	int rc;
6384

6385 6386 6387 6388
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
J
Jens Axboe 已提交
6389
}
6390 6391
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6392 6393
#endif /* CONFIG_PCI */

6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413
/**
 *	ata_platform_remove_one - Platform layer callback for device removal
 *	@pdev: Platform device that was removed
 *
 *	Platform layer indicates to libata via this hook that hot-unplug or
 *	module unload event has occurred.  Detach all ports.  Resource
 *	release is handled via devres.
 *
 *	LOCKING:
 *	Inherited from platform layer (may sleep).
 */
int ata_platform_remove_one(struct platform_device *pdev)
{
	struct ata_host *host = platform_get_drvdata(pdev);

	ata_host_detach(host);

	return 0;
}

6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433
static int __init ata_parse_force_one(char **cur,
				      struct ata_force_ent *force_ent,
				      const char **reason)
{
	/* FIXME: Currently, there's no way to tag init const data and
	 * using __initdata causes build failure on some versions of
	 * gcc.  Once __initdataconst is implemented, add const to the
	 * following structure.
	 */
	static struct ata_force_param force_tbl[] __initdata = {
		{ "40c",	.cbl		= ATA_CBL_PATA40 },
		{ "80c",	.cbl		= ATA_CBL_PATA80 },
		{ "short40c",	.cbl		= ATA_CBL_PATA40_SHORT },
		{ "unk",	.cbl		= ATA_CBL_PATA_UNK },
		{ "ign",	.cbl		= ATA_CBL_PATA_IGN },
		{ "sata",	.cbl		= ATA_CBL_SATA },
		{ "1.5Gbps",	.spd_limit	= 1 },
		{ "3.0Gbps",	.spd_limit	= 2 },
		{ "noncq",	.horkage_on	= ATA_HORKAGE_NONCQ },
		{ "ncq",	.horkage_off	= ATA_HORKAGE_NONCQ },
6434
		{ "dump_id",	.horkage_on	= ATA_HORKAGE_DUMP_ID },
6435 6436 6437 6438 6439 6440 6441 6442 6443 6444 6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468
		{ "pio0",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 0) },
		{ "pio1",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 1) },
		{ "pio2",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 2) },
		{ "pio3",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 3) },
		{ "pio4",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 4) },
		{ "pio5",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 5) },
		{ "pio6",	.xfer_mask	= 1 << (ATA_SHIFT_PIO + 6) },
		{ "mwdma0",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 0) },
		{ "mwdma1",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 1) },
		{ "mwdma2",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 2) },
		{ "mwdma3",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 3) },
		{ "mwdma4",	.xfer_mask	= 1 << (ATA_SHIFT_MWDMA + 4) },
		{ "udma0",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma/16",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 0) },
		{ "udma1",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma/25",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 1) },
		{ "udma2",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma/33",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 2) },
		{ "udma3",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma/44",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 3) },
		{ "udma4",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma/66",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 4) },
		{ "udma5",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma/100",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 5) },
		{ "udma6",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma/133",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 6) },
		{ "udma7",	.xfer_mask	= 1 << (ATA_SHIFT_UDMA + 7) },
6469 6470 6471
		{ "nohrst",	.lflags		= ATA_LFLAG_NO_HRST },
		{ "nosrst",	.lflags		= ATA_LFLAG_NO_SRST },
		{ "norst",	.lflags		= ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST },
D
Dan Williams 已提交
6472
		{ "rstonce",	.lflags		= ATA_LFLAG_RST_ONCE },
6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504 6505 6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528 6529 6530 6531 6532 6533 6534 6535 6536 6537 6538 6539 6540 6541 6542 6543 6544 6545 6546 6547 6548 6549 6550 6551 6552 6553 6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592
	};
	char *start = *cur, *p = *cur;
	char *id, *val, *endp;
	const struct ata_force_param *match_fp = NULL;
	int nr_matches = 0, i;

	/* find where this param ends and update *cur */
	while (*p != '\0' && *p != ',')
		p++;

	if (*p == '\0')
		*cur = p;
	else
		*cur = p + 1;

	*p = '\0';

	/* parse */
	p = strchr(start, ':');
	if (!p) {
		val = strstrip(start);
		goto parse_val;
	}
	*p = '\0';

	id = strstrip(start);
	val = strstrip(p + 1);

	/* parse id */
	p = strchr(id, '.');
	if (p) {
		*p++ = '\0';
		force_ent->device = simple_strtoul(p, &endp, 10);
		if (p == endp || *endp != '\0') {
			*reason = "invalid device";
			return -EINVAL;
		}
	}

	force_ent->port = simple_strtoul(id, &endp, 10);
	if (p == endp || *endp != '\0') {
		*reason = "invalid port/link";
		return -EINVAL;
	}

 parse_val:
	/* parse val, allow shortcuts so that both 1.5 and 1.5Gbps work */
	for (i = 0; i < ARRAY_SIZE(force_tbl); i++) {
		const struct ata_force_param *fp = &force_tbl[i];

		if (strncasecmp(val, fp->name, strlen(val)))
			continue;

		nr_matches++;
		match_fp = fp;

		if (strcasecmp(val, fp->name) == 0) {
			nr_matches = 1;
			break;
		}
	}

	if (!nr_matches) {
		*reason = "unknown value";
		return -EINVAL;
	}
	if (nr_matches > 1) {
		*reason = "ambigious value";
		return -EINVAL;
	}

	force_ent->param = *match_fp;

	return 0;
}

static void __init ata_parse_force_param(void)
{
	int idx = 0, size = 1;
	int last_port = -1, last_device = -1;
	char *p, *cur, *next;

	/* calculate maximum number of params and allocate force_tbl */
	for (p = ata_force_param_buf; *p; p++)
		if (*p == ',')
			size++;

	ata_force_tbl = kzalloc(sizeof(ata_force_tbl[0]) * size, GFP_KERNEL);
	if (!ata_force_tbl) {
		printk(KERN_WARNING "ata: failed to extend force table, "
		       "libata.force ignored\n");
		return;
	}

	/* parse and populate the table */
	for (cur = ata_force_param_buf; *cur != '\0'; cur = next) {
		const char *reason = "";
		struct ata_force_ent te = { .port = -1, .device = -1 };

		next = cur;
		if (ata_parse_force_one(&next, &te, &reason)) {
			printk(KERN_WARNING "ata: failed to parse force "
			       "parameter \"%s\" (%s)\n",
			       cur, reason);
			continue;
		}

		if (te.port == -1) {
			te.port = last_port;
			te.device = last_device;
		}

		ata_force_tbl[idx++] = te;

		last_port = te.port;
		last_device = te.device;
	}

	ata_force_tbl_size = idx;
}
L
Linus Torvalds 已提交
6593 6594 6595

static int __init ata_init(void)
{
G
Gwendal Grignou 已提交
6596
	int rc;
6597

6598 6599
	ata_parse_force_param();

6600 6601
	ata_acpi_register();

6602
	rc = ata_sff_init();
6603 6604 6605 6606
	if (rc) {
		kfree(ata_force_tbl);
		return rc;
	}
6607

G
Gwendal Grignou 已提交
6608 6609 6610 6611 6612 6613
	libata_transport_init();
	ata_scsi_transport_template = ata_attach_transport();
	if (!ata_scsi_transport_template) {
		ata_sff_exit();
		rc = -ENOMEM;
		goto err_out;
6614
	}
G
Gwendal Grignou 已提交
6615

L
Linus Torvalds 已提交
6616 6617
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
G
Gwendal Grignou 已提交
6618 6619 6620

err_out:
	return rc;
L
Linus Torvalds 已提交
6621 6622 6623 6624
}

static void __exit ata_exit(void)
{
G
Gwendal Grignou 已提交
6625 6626
	ata_release_transport(ata_scsi_transport_template);
	libata_transport_exit();
6627
	ata_sff_exit();
6628
	ata_acpi_unregister();
6629
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6630 6631
}

6632
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6633 6634
module_exit(ata_exit);

A
Akinobu Mita 已提交
6635
static DEFINE_RATELIMIT_STATE(ratelimit, HZ / 5, 1);
6636 6637 6638

int ata_ratelimit(void)
{
A
Akinobu Mita 已提交
6639
	return __ratelimit(&ratelimit);
6640 6641
}

6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655
/**
 *	ata_msleep - ATA EH owner aware msleep
 *	@ap: ATA port to attribute the sleep to
 *	@msecs: duration to sleep in milliseconds
 *
 *	Sleeps @msecs.  If the current task is owner of @ap's EH, the
 *	ownership is released before going to sleep and reacquired
 *	after the sleep is complete.  IOW, other ports sharing the
 *	@ap->host will be allowed to own the EH while this task is
 *	sleeping.
 *
 *	LOCKING:
 *	Might sleep.
 */
6656 6657
void ata_msleep(struct ata_port *ap, unsigned int msecs)
{
6658 6659 6660 6661 6662
	bool owns_eh = ap && ap->host->eh_owner == current;

	if (owns_eh)
		ata_eh_release(ap);

6663
	msleep(msecs);
6664 6665 6666

	if (owns_eh)
		ata_eh_acquire(ap);
6667 6668
}

6669 6670
/**
 *	ata_wait_register - wait until register value changes
6671
 *	@ap: ATA port to wait register for, can be NULL
6672 6673 6674
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6675 6676
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6677 6678 6679 6680 6681 6682 6683 6684 6685 6686 6687 6688 6689 6690 6691 6692
 *
 *	Waiting for some bits of register to change is a common
 *	operation for ATA controllers.  This function reads 32bit LE
 *	IO-mapped register @reg and tests for the following condition.
 *
 *	(*@reg & mask) != val
 *
 *	If the condition is met, it returns; otherwise, the process is
 *	repeated after @interval_msec until timeout.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	The final register value.
 */
6693
u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
6694
		      unsigned long interval, unsigned long timeout)
6695
{
6696
	unsigned long deadline;
6697 6698 6699 6700 6701 6702 6703 6704
	u32 tmp;

	tmp = ioread32(reg);

	/* Calculate timeout _after_ the first read to make sure
	 * preceding writes reach the controller before starting to
	 * eat away the timeout.
	 */
6705
	deadline = ata_deadline(jiffies, timeout);
6706

6707
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
6708
		ata_msleep(ap, interval);
6709 6710 6711 6712 6713 6714
		tmp = ioread32(reg);
	}

	return tmp;
}

T
Tejun Heo 已提交
6715 6716 6717
/*
 * Dummy port_ops
 */
T
Tejun Heo 已提交
6718
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
T
Tejun Heo 已提交
6719
{
T
Tejun Heo 已提交
6720
	return AC_ERR_SYSTEM;
T
Tejun Heo 已提交
6721 6722
}

T
Tejun Heo 已提交
6723
static void ata_dummy_error_handler(struct ata_port *ap)
T
Tejun Heo 已提交
6724
{
T
Tejun Heo 已提交
6725
	/* truly dummy */
T
Tejun Heo 已提交
6726 6727
}

6728
struct ata_port_operations ata_dummy_port_ops = {
T
Tejun Heo 已提交
6729 6730
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
T
Tejun Heo 已提交
6731
	.error_handler		= ata_dummy_error_handler,
6732 6733
	.sched_eh		= ata_std_sched_eh,
	.end_eh			= ata_std_end_eh,
T
Tejun Heo 已提交
6734 6735
};

6736 6737 6738 6739
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

6740 6741 6742 6743 6744 6745 6746 6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759 6760 6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771 6772 6773 6774 6775 6776 6777 6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791 6792 6793 6794 6795 6796 6797 6798 6799 6800 6801 6802 6803 6804 6805 6806 6807 6808 6809
/*
 * Utility print functions
 */
int ata_port_printk(const struct ata_port *ap, const char *level,
		    const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;
	int r;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	r = printk("%sata%u: %pV", level, ap->print_id, &vaf);

	va_end(args);

	return r;
}
EXPORT_SYMBOL(ata_port_printk);

int ata_link_printk(const struct ata_link *link, const char *level,
		    const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;
	int r;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	if (sata_pmp_attached(link->ap) || link->ap->slave_link)
		r = printk("%sata%u.%02u: %pV",
			   level, link->ap->print_id, link->pmp, &vaf);
	else
		r = printk("%sata%u: %pV",
			   level, link->ap->print_id, &vaf);

	va_end(args);

	return r;
}
EXPORT_SYMBOL(ata_link_printk);

int ata_dev_printk(const struct ata_device *dev, const char *level,
		    const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;
	int r;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	r = printk("%sata%u.%02u: %pV",
		   level, dev->link->ap->print_id, dev->link->pmp + dev->devno,
		   &vaf);

	va_end(args);

	return r;
}
EXPORT_SYMBOL(ata_dev_printk);

6810 6811 6812 6813 6814 6815
void ata_print_version(const struct device *dev, const char *version)
{
	dev_printk(KERN_DEBUG, dev, "version %s\n", version);
}
EXPORT_SYMBOL(ata_print_version);

L
Linus Torvalds 已提交
6816 6817 6818 6819 6820 6821
/*
 * libata is essentially a library of internal helper functions for
 * low-level ATA host controller drivers.  As such, the API/ABI is
 * likely to change as new drivers are added and updated.
 * Do not depend on ABI/API stability.
 */
6822 6823 6824
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);
6825 6826
EXPORT_SYMBOL_GPL(ata_base_port_ops);
EXPORT_SYMBOL_GPL(sata_port_ops);
T
Tejun Heo 已提交
6827
EXPORT_SYMBOL_GPL(ata_dummy_port_ops);
6828
EXPORT_SYMBOL_GPL(ata_dummy_port_info);
T
Tejun Heo 已提交
6829 6830
EXPORT_SYMBOL_GPL(ata_link_next);
EXPORT_SYMBOL_GPL(ata_dev_next);
L
Linus Torvalds 已提交
6831
EXPORT_SYMBOL_GPL(ata_std_bios_param);
6832
EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
J
Jeff Garzik 已提交
6833
EXPORT_SYMBOL_GPL(ata_host_init);
6834
EXPORT_SYMBOL_GPL(ata_host_alloc);
6835
EXPORT_SYMBOL_GPL(ata_host_alloc_pinfo);
T
Tejun Heo 已提交
6836
EXPORT_SYMBOL_GPL(ata_slave_link_init);
6837
EXPORT_SYMBOL_GPL(ata_host_start);
6838
EXPORT_SYMBOL_GPL(ata_host_register);
6839
EXPORT_SYMBOL_GPL(ata_host_activate);
T
Tejun Heo 已提交
6840
EXPORT_SYMBOL_GPL(ata_host_detach);
L
Linus Torvalds 已提交
6841
EXPORT_SYMBOL_GPL(ata_sg_init);
6842
EXPORT_SYMBOL_GPL(ata_qc_complete);
6843
EXPORT_SYMBOL_GPL(ata_qc_complete_multiple);
T
Tejun Heo 已提交
6844
EXPORT_SYMBOL_GPL(atapi_cmd_type);
L
Linus Torvalds 已提交
6845 6846
EXPORT_SYMBOL_GPL(ata_tf_to_fis);
EXPORT_SYMBOL_GPL(ata_tf_from_fis);
6847 6848 6849 6850 6851 6852 6853
EXPORT_SYMBOL_GPL(ata_pack_xfermask);
EXPORT_SYMBOL_GPL(ata_unpack_xfermask);
EXPORT_SYMBOL_GPL(ata_xfer_mask2mode);
EXPORT_SYMBOL_GPL(ata_xfer_mode2mask);
EXPORT_SYMBOL_GPL(ata_xfer_mode2shift);
EXPORT_SYMBOL_GPL(ata_mode_string);
EXPORT_SYMBOL_GPL(ata_id_xfermask);
6854
EXPORT_SYMBOL_GPL(ata_do_set_mode);
6855
EXPORT_SYMBOL_GPL(ata_std_qc_defer);
6856
EXPORT_SYMBOL_GPL(ata_noop_qc_prep);
6857
EXPORT_SYMBOL_GPL(ata_dev_disable);
6858
EXPORT_SYMBOL_GPL(sata_set_spd);
6859
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
6860 6861
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
6862
EXPORT_SYMBOL_GPL(sata_link_scr_lpm);
6863
EXPORT_SYMBOL_GPL(ata_std_prereset);
T
Tejun Heo 已提交
6864
EXPORT_SYMBOL_GPL(sata_link_hardreset);
6865
EXPORT_SYMBOL_GPL(sata_std_hardreset);
6866
EXPORT_SYMBOL_GPL(ata_std_postreset);
6867 6868
EXPORT_SYMBOL_GPL(ata_dev_classify);
EXPORT_SYMBOL_GPL(ata_dev_pair);
6869
EXPORT_SYMBOL_GPL(ata_ratelimit);
6870
EXPORT_SYMBOL_GPL(ata_msleep);
6871
EXPORT_SYMBOL_GPL(ata_wait_register);
L
Linus Torvalds 已提交
6872 6873
EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
6874
EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
6875
EXPORT_SYMBOL_GPL(ata_scsi_change_queue_depth);
6876
EXPORT_SYMBOL_GPL(__ata_change_queue_depth);
6877 6878 6879 6880
EXPORT_SYMBOL_GPL(sata_scr_valid);
EXPORT_SYMBOL_GPL(sata_scr_read);
EXPORT_SYMBOL_GPL(sata_scr_write);
EXPORT_SYMBOL_GPL(sata_scr_write_flush);
6881 6882
EXPORT_SYMBOL_GPL(ata_link_online);
EXPORT_SYMBOL_GPL(ata_link_offline);
6883
#ifdef CONFIG_PM
J
Jeff Garzik 已提交
6884 6885
EXPORT_SYMBOL_GPL(ata_host_suspend);
EXPORT_SYMBOL_GPL(ata_host_resume);
6886
#endif /* CONFIG_PM */
6887 6888
EXPORT_SYMBOL_GPL(ata_id_string);
EXPORT_SYMBOL_GPL(ata_id_c_string);
6889
EXPORT_SYMBOL_GPL(ata_do_dev_read_id);
L
Linus Torvalds 已提交
6890 6891
EXPORT_SYMBOL_GPL(ata_scsi_simulate);

6892
EXPORT_SYMBOL_GPL(ata_pio_need_iordy);
6893
EXPORT_SYMBOL_GPL(ata_timing_find_mode);
A
Alan Cox 已提交
6894 6895
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6896
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
A
Alan Cox 已提交
6897

L
Linus Torvalds 已提交
6898 6899 6900
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(pci_test_config_bits);
EXPORT_SYMBOL_GPL(ata_pci_remove_one);
6901
#ifdef CONFIG_PM
6902 6903
EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_do_resume);
J
Jens Axboe 已提交
6904 6905
EXPORT_SYMBOL_GPL(ata_pci_device_suspend);
EXPORT_SYMBOL_GPL(ata_pci_device_resume);
6906
#endif /* CONFIG_PM */
L
Linus Torvalds 已提交
6907
#endif /* CONFIG_PCI */
J
Jens Axboe 已提交
6908

6909 6910
EXPORT_SYMBOL_GPL(ata_platform_remove_one);

T
Tejun Heo 已提交
6911 6912 6913
EXPORT_SYMBOL_GPL(__ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_push_desc);
EXPORT_SYMBOL_GPL(ata_ehi_clear_desc);
6914 6915 6916 6917
EXPORT_SYMBOL_GPL(ata_port_desc);
#ifdef CONFIG_PCI
EXPORT_SYMBOL_GPL(ata_port_pbar_desc);
#endif /* CONFIG_PCI */
6918
EXPORT_SYMBOL_GPL(ata_port_schedule_eh);
6919
EXPORT_SYMBOL_GPL(ata_link_abort);
6920
EXPORT_SYMBOL_GPL(ata_port_abort);
6921
EXPORT_SYMBOL_GPL(ata_port_freeze);
6922
EXPORT_SYMBOL_GPL(sata_async_notification);
6923 6924
EXPORT_SYMBOL_GPL(ata_eh_freeze_port);
EXPORT_SYMBOL_GPL(ata_eh_thaw_port);
6925 6926
EXPORT_SYMBOL_GPL(ata_eh_qc_complete);
EXPORT_SYMBOL_GPL(ata_eh_qc_retry);
6927
EXPORT_SYMBOL_GPL(ata_eh_analyze_ncq_error);
T
Tejun Heo 已提交
6928
EXPORT_SYMBOL_GPL(ata_do_eh);
6929
EXPORT_SYMBOL_GPL(ata_std_error_handler);
A
Alan Cox 已提交
6930 6931 6932 6933

EXPORT_SYMBOL_GPL(ata_cable_40wire);
EXPORT_SYMBOL_GPL(ata_cable_80wire);
EXPORT_SYMBOL_GPL(ata_cable_unknown);
T
Tejun Heo 已提交
6934
EXPORT_SYMBOL_GPL(ata_cable_ignore);
A
Alan Cox 已提交
6935
EXPORT_SYMBOL_GPL(ata_cable_sata);