libata-core.c 177.0 KB
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/*
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 *  libata-core.c - helper library for ATA
 *
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 *  Maintained by:  Tejun Heo <tj@kernel.org>
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 *    		    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 <linux/glob.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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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;

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	fis[16] = tf->auxiliary & 0xff;
	fis[17] = (tf->auxiliary >> 8) & 0xff;
	fis[18] = (tf->auxiliary >> 16) & 0xff;
	fis[19] = (tf->auxiliary >> 24) & 0xff;
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}

/**
 *	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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/**
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 *	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;
662
	} 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) {
717 718
			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)
869 870 871 872 873 874
{
	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;
}

896
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
 */
919
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)
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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)
			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
980
 *	(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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{
991 992 993 994 995 996
	static const char * const xfer_mode_str[] = {
		"PIO0",
		"PIO1",
		"PIO2",
		"PIO3",
		"PIO4",
997 998
		"PIO5",
		"PIO6",
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		"MWDMA0",
		"MWDMA1",
		"MWDMA2",
1002 1003
		"MWDMA3",
		"MWDMA4",
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		"UDMA/16",
		"UDMA/25",
		"UDMA/33",
		"UDMA/44",
		"UDMA/66",
		"UDMA/100",
		"UDMA/133",
		"UDMA7",
	};
1013
	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>";
}

1021
const char *sata_spd_string(unsigned int spd)
1022 1023 1024 1025
{
	static const char * const spd_str[] = {
		"1.5 Gbps",
		"3.0 Gbps",
1026
		"6.0 Gbps",
1027 1028 1029 1030 1031 1032 1033
	};

	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:
1046 1047
 *	Device type, %ATA_DEV_ATA, %ATA_DEV_ATAPI, %ATA_DEV_PMP,
 *	%ATA_DEV_ZAC, 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)) {
1088 1089
		DPRINTK("found SEMB device by sig (could be ATA device)\n");
		return ATA_DEV_SEMB;
1090 1091
	}

1092 1093 1094 1095 1096
	if ((tf->lbam == 0xcd) && (tf->lbah == 0xab)) {
		DPRINTK("found ZAC device by sig\n");
		return ATA_DEV_ZAC;
	}

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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.
 */

1116 1117
void ata_id_string(const u16 *id, unsigned char *s,
		   unsigned int ofs, unsigned int len)
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{
	unsigned int c;

1121 1122
	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;
	}
}

1137
/**
1138
 *	ata_id_c_string - Convert IDENTIFY DEVICE page into C string
1139 1140 1141 1142 1143
 *	@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.
 *
1144
 *	This function is identical to ata_id_string except that it
1145 1146 1147 1148 1149 1150
 *	trims trailing spaces and terminates the resulting string with
 *	null.  @len must be actual maximum length (even number) + 1.
 *
 *	LOCKING:
 *	caller.
 */
1151 1152
void ata_id_c_string(const u16 *id, unsigned char *s,
		     unsigned int ofs, unsigned int len)
1153 1154 1155
{
	unsigned char *p;

1156
	ata_id_string(id, s, ofs, len - 1);
1157 1158 1159 1160 1161 1162

	p = s + strnlen(s, len - 1);
	while (p > s && p[-1] == ' ')
		p--;
	*p = '\0';
}
1163

1164 1165 1166 1167
static u64 ata_id_n_sectors(const u16 *id)
{
	if (ata_id_has_lba(id)) {
		if (ata_id_has_lba48(id))
1168
			return ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
1169
		else
1170
			return ata_id_u32(id, ATA_ID_LBA_CAPACITY);
1171 1172
	} else {
		if (ata_id_current_chs_valid(id))
1173 1174
			return id[ATA_ID_CUR_CYLS] * id[ATA_ID_CUR_HEADS] *
			       id[ATA_ID_CUR_SECTORS];
1175
		else
1176 1177
			return id[ATA_ID_CYLS] * id[ATA_ID_HEADS] *
			       id[ATA_ID_SECTORS];
1178 1179 1180
	}
}

1181
u64 ata_tf_to_lba48(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1182 1183 1184 1185 1186
{
	u64 sectors = 0;

	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
1187
	sectors |= ((u64)(tf->hob_lbal & 0xff)) << 24;
A
Alan Cox 已提交
1188 1189 1190 1191
	sectors |= (tf->lbah & 0xff) << 16;
	sectors |= (tf->lbam & 0xff) << 8;
	sectors |= (tf->lbal & 0xff);

1192
	return sectors;
A
Alan Cox 已提交
1193 1194
}

1195
u64 ata_tf_to_lba(const struct ata_taskfile *tf)
A
Alan Cox 已提交
1196 1197 1198 1199 1200 1201 1202 1203
{
	u64 sectors = 0;

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

1204
	return sectors;
A
Alan Cox 已提交
1205 1206 1207
}

/**
1208 1209 1210
 *	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
1211
 *
1212 1213
 *	Perform an LBA48 or LBA28 native size query upon the device in
 *	question.
A
Alan Cox 已提交
1214
 *
1215 1216 1217
 *	RETURNS:
 *	0 on success, -EACCES if command is aborted by the drive.
 *	-EIO on other errors.
A
Alan Cox 已提交
1218
 */
1219
static int ata_read_native_max_address(struct ata_device *dev, u64 *max_sectors)
A
Alan Cox 已提交
1220
{
1221
	unsigned int err_mask;
A
Alan Cox 已提交
1222
	struct ata_taskfile tf;
1223
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1224 1225 1226

	ata_tf_init(dev, &tf);

1227
	/* always clear all address registers */
A
Alan Cox 已提交
1228 1229
	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;

1230 1231 1232 1233 1234
	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
1235 1236

	tf.protocol |= ATA_PROT_NODATA;
1237 1238
	tf.device |= ATA_LBA;

1239
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1240
	if (err_mask) {
1241 1242 1243
		ata_dev_warn(dev,
			     "failed to read native max address (err_mask=0x%x)\n",
			     err_mask);
1244 1245 1246 1247
		if (err_mask == AC_ERR_DEV && (tf.feature & ATA_ABORTED))
			return -EACCES;
		return -EIO;
	}
A
Alan Cox 已提交
1248

1249
	if (lba48)
1250
		*max_sectors = ata_tf_to_lba48(&tf) + 1;
1251
	else
1252
		*max_sectors = ata_tf_to_lba(&tf) + 1;
1253
	if (dev->horkage & ATA_HORKAGE_HPA_SIZE)
1254
		(*max_sectors)--;
1255
	return 0;
A
Alan Cox 已提交
1256 1257 1258
}

/**
1259 1260
 *	ata_set_max_sectors - Set max sectors
 *	@dev: target device
1261
 *	@new_sectors: new max sectors value to set for the device
A
Alan Cox 已提交
1262
 *
1263 1264 1265 1266 1267 1268
 *	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
1269
 */
1270
static int ata_set_max_sectors(struct ata_device *dev, u64 new_sectors)
A
Alan Cox 已提交
1271
{
1272
	unsigned int err_mask;
A
Alan Cox 已提交
1273
	struct ata_taskfile tf;
1274
	int lba48 = ata_id_has_lba48(dev->id);
A
Alan Cox 已提交
1275 1276 1277 1278 1279 1280

	new_sectors--;

	ata_tf_init(dev, &tf);

	tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1281 1282 1283 1284 1285 1286 1287 1288

	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;
1289
	} else {
1290 1291
		tf.command = ATA_CMD_SET_MAX;

1292 1293 1294
		tf.device |= (new_sectors >> 24) & 0xf;
	}

A
Alan Cox 已提交
1295
	tf.protocol |= ATA_PROT_NODATA;
1296
	tf.device |= ATA_LBA;
A
Alan Cox 已提交
1297 1298 1299 1300 1301

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

1302
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1303
	if (err_mask) {
1304 1305 1306
		ata_dev_warn(dev,
			     "failed to set max address (err_mask=0x%x)\n",
			     err_mask);
1307 1308 1309 1310 1311 1312 1313
		if (err_mask == AC_ERR_DEV &&
		    (tf.feature & (ATA_ABORTED | ATA_IDNF)))
			return -EACCES;
		return -EIO;
	}

	return 0;
A
Alan Cox 已提交
1314 1315 1316 1317 1318 1319 1320 1321 1322
}

/**
 *	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.
1323 1324 1325
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
A
Alan Cox 已提交
1326
 */
1327
static int ata_hpa_resize(struct ata_device *dev)
A
Alan Cox 已提交
1328
{
1329 1330
	struct ata_eh_context *ehc = &dev->link->eh_context;
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
1331
	bool unlock_hpa = ata_ignore_hpa || dev->flags & ATA_DFLAG_UNLOCK_HPA;
1332 1333
	u64 sectors = ata_id_n_sectors(dev->id);
	u64 native_sectors;
1334
	int rc;
1335

1336
	/* do we need to do it? */
1337
	if ((dev->class != ATA_DEV_ATA && dev->class != ATA_DEV_ZAC) ||
1338 1339
	    !ata_id_has_lba(dev->id) || !ata_id_hpa_enabled(dev->id) ||
	    (dev->horkage & ATA_HORKAGE_BROKEN_HPA))
1340
		return 0;
A
Alan Cox 已提交
1341

1342 1343 1344
	/* read native max address */
	rc = ata_read_native_max_address(dev, &native_sectors);
	if (rc) {
1345 1346
		/* If device aborted the command or HPA isn't going to
		 * be unlocked, skip HPA resizing.
1347
		 */
1348
		if (rc == -EACCES || !unlock_hpa) {
1349 1350
			ata_dev_warn(dev,
				     "HPA support seems broken, skipping HPA handling\n");
1351 1352 1353 1354 1355
			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
1356
		}
1357

1358 1359
		return rc;
	}
1360
	dev->n_native_sectors = native_sectors;
1361 1362

	/* nothing to do? */
1363
	if (native_sectors <= sectors || !unlock_hpa) {
1364 1365 1366 1367
		if (!print_info || native_sectors == sectors)
			return 0;

		if (native_sectors > sectors)
1368
			ata_dev_info(dev,
1369 1370 1371 1372
				"HPA detected: current %llu, native %llu\n",
				(unsigned long long)sectors,
				(unsigned long long)native_sectors);
		else if (native_sectors < sectors)
1373 1374
			ata_dev_warn(dev,
				"native sectors (%llu) is smaller than sectors (%llu)\n",
1375 1376 1377 1378 1379 1380 1381 1382 1383
				(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 */
1384 1385 1386 1387
		ata_dev_warn(dev,
			     "device aborted resize (%llu -> %llu), skipping HPA handling\n",
			     (unsigned long long)sectors,
			     (unsigned long long)native_sectors);
1388 1389 1390 1391 1392 1393 1394 1395
		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) {
1396 1397
		ata_dev_err(dev,
			    "failed to re-read IDENTIFY data after HPA resizing\n");
1398 1399 1400 1401 1402
		return rc;
	}

	if (print_info) {
		u64 new_sectors = ata_id_n_sectors(dev->id);
1403
		ata_dev_info(dev,
1404 1405 1406 1407 1408 1409 1410
			"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
1411 1412
}

L
Linus Torvalds 已提交
1413 1414
/**
 *	ata_dump_id - IDENTIFY DEVICE info debugging output
1415
 *	@id: IDENTIFY DEVICE page to dump
L
Linus Torvalds 已提交
1416
 *
1417 1418
 *	Dump selected 16-bit words from the given IDENTIFY DEVICE
 *	page.
L
Linus Torvalds 已提交
1419 1420 1421 1422 1423
 *
 *	LOCKING:
 *	caller.
 */

1424
static inline void ata_dump_id(const u16 *id)
L
Linus Torvalds 已提交
1425 1426 1427 1428 1429 1430
{
	DPRINTK("49==0x%04x  "
		"53==0x%04x  "
		"63==0x%04x  "
		"64==0x%04x  "
		"75==0x%04x  \n",
1431 1432 1433 1434 1435
		id[49],
		id[53],
		id[63],
		id[64],
		id[75]);
L
Linus Torvalds 已提交
1436 1437 1438 1439 1440
	DPRINTK("80==0x%04x  "
		"81==0x%04x  "
		"82==0x%04x  "
		"83==0x%04x  "
		"84==0x%04x  \n",
1441 1442 1443 1444 1445
		id[80],
		id[81],
		id[82],
		id[83],
		id[84]);
L
Linus Torvalds 已提交
1446 1447
	DPRINTK("88==0x%04x  "
		"93==0x%04x\n",
1448 1449
		id[88],
		id[93]);
L
Linus Torvalds 已提交
1450 1451
}

1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
/**
 *	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
 */
1467
unsigned long ata_id_xfermask(const u16 *id)
1468
{
1469
	unsigned long pio_mask, mwdma_mask, udma_mask;
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480

	/* 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.
		 */
1481
		u8 mode = (id[ATA_ID_OLD_PIO_MODES] >> 8) & 0xFF;
1482
		if (mode < 5)	/* Valid PIO range */
1483
			pio_mask = (2 << mode) - 1;
1484 1485
		else
			pio_mask = 1;
1486 1487 1488 1489 1490 1491 1492 1493 1494 1495

		/* 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;
1496

1497 1498 1499 1500
	if (ata_id_is_cfa(id)) {
		/*
		 *	Process compact flash extended modes
		 */
1501 1502
		int pio = (id[ATA_ID_CFA_MODES] >> 0) & 0x7;
		int dma = (id[ATA_ID_CFA_MODES] >> 3) & 0x7;
1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513

		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);
	}

1514 1515 1516
	udma_mask = 0;
	if (id[ATA_ID_FIELD_VALID] & (1 << 2))
		udma_mask = id[ATA_ID_UDMA_MODES] & 0xff;
1517 1518 1519 1520

	return ata_pack_xfermask(pio_mask, mwdma_mask, udma_mask);
}

1521
static void ata_qc_complete_internal(struct ata_queued_cmd *qc)
1522
{
1523
	struct completion *waiting = qc->private_data;
1524 1525 1526 1527 1528

	complete(waiting);
}

/**
1529
 *	ata_exec_internal_sg - execute libata internal command
1530 1531
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
1532
 *	@cdb: CDB for packet command
1533
 *	@dma_dir: Data transfer direction of the command
1534
 *	@sgl: sg list for the data buffer of the command
1535
 *	@n_elem: Number of sg entries
1536
 *	@timeout: Timeout in msecs (0 for default)
1537 1538 1539 1540 1541 1542 1543 1544 1545
 *
 *	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.
1546 1547 1548
 *
 *	RETURNS:
 *	Zero on success, AC_ERR_* mask on failure
1549
 */
1550 1551
unsigned ata_exec_internal_sg(struct ata_device *dev,
			      struct ata_taskfile *tf, const u8 *cdb,
1552
			      int dma_dir, struct scatterlist *sgl,
1553
			      unsigned int n_elem, unsigned long timeout)
1554
{
1555 1556
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
1557
	u8 command = tf->command;
1558
	int auto_timeout = 0;
1559
	struct ata_queued_cmd *qc;
1560
	unsigned int tag, preempted_tag;
1561
	u32 preempted_sactive, preempted_qc_active;
1562
	int preempted_nr_active_links;
1563
	DECLARE_COMPLETION_ONSTACK(wait);
1564
	unsigned long flags;
1565
	unsigned int err_mask;
1566
	int rc;
1567

1568
	spin_lock_irqsave(ap->lock, flags);
1569

1570
	/* no internal command while frozen */
1571
	if (ap->pflags & ATA_PFLAG_FROZEN) {
1572
		spin_unlock_irqrestore(ap->lock, flags);
1573 1574 1575
		return AC_ERR_SYSTEM;
	}

1576
	/* initialize internal qc */
1577

1578 1579 1580 1581 1582 1583 1584 1585 1586 1587
	/* 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;

1588
	qc = __ata_qc_from_tag(ap, tag);
1589 1590 1591 1592 1593 1594 1595

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

1596 1597
	preempted_tag = link->active_tag;
	preempted_sactive = link->sactive;
1598
	preempted_qc_active = ap->qc_active;
1599
	preempted_nr_active_links = ap->nr_active_links;
1600 1601
	link->active_tag = ATA_TAG_POISON;
	link->sactive = 0;
1602
	ap->qc_active = 0;
1603
	ap->nr_active_links = 0;
1604 1605

	/* prepare & issue qc */
1606
	qc->tf = *tf;
1607 1608
	if (cdb)
		memcpy(qc->cdb, cdb, ATAPI_CDB_LEN);
1609 1610 1611 1612 1613 1614

	/* some SATA bridges need us to indicate data xfer direction */
	if (tf->protocol == ATAPI_PROT_DMA && (dev->flags & ATA_DFLAG_DMADIR) &&
	    dma_dir == DMA_FROM_DEVICE)
		qc->tf.feature |= ATAPI_DMADIR;

1615
	qc->flags |= ATA_QCFLAG_RESULT_TF;
1616 1617
	qc->dma_dir = dma_dir;
	if (dma_dir != DMA_NONE) {
1618
		unsigned int i, buflen = 0;
1619
		struct scatterlist *sg;
1620

1621 1622
		for_each_sg(sgl, sg, n_elem, i)
			buflen += sg->length;
1623

1624
		ata_sg_init(qc, sgl, n_elem);
1625
		qc->nbytes = buflen;
1626 1627
	}

1628
	qc->private_data = &wait;
1629 1630
	qc->complete_fn = ata_qc_complete_internal;

1631
	ata_qc_issue(qc);
1632

1633
	spin_unlock_irqrestore(ap->lock, flags);
1634

1635 1636 1637 1638 1639 1640 1641 1642
	if (!timeout) {
		if (ata_probe_timeout)
			timeout = ata_probe_timeout * 1000;
		else {
			timeout = ata_internal_cmd_timeout(dev, command);
			auto_timeout = 1;
		}
	}
1643

1644 1645 1646
	if (ap->ops->error_handler)
		ata_eh_release(ap);

1647
	rc = wait_for_completion_timeout(&wait, msecs_to_jiffies(timeout));
1648

1649 1650 1651
	if (ap->ops->error_handler)
		ata_eh_acquire(ap);

1652
	ata_sff_flush_pio_task(ap);
1653

1654
	if (!rc) {
1655
		spin_lock_irqsave(ap->lock, flags);
1656 1657 1658

		/* We're racing with irq here.  If we lose, the
		 * following test prevents us from completing the qc
1659 1660
		 * twice.  If we win, the port is frozen and will be
		 * cleaned up by ->post_internal_cmd().
1661
		 */
1662
		if (qc->flags & ATA_QCFLAG_ACTIVE) {
1663 1664 1665 1666 1667 1668
			qc->err_mask |= AC_ERR_TIMEOUT;

			if (ap->ops->error_handler)
				ata_port_freeze(ap);
			else
				ata_qc_complete(qc);
1669

1670
			if (ata_msg_warn(ap))
1671 1672
				ata_dev_warn(dev, "qc timeout (cmd 0x%x)\n",
					     command);
1673 1674
		}

1675
		spin_unlock_irqrestore(ap->lock, flags);
1676 1677
	}

1678 1679 1680 1681
	/* do post_internal_cmd */
	if (ap->ops->post_internal_cmd)
		ap->ops->post_internal_cmd(qc);

1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
	/* 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;
1692 1693
	}

1694
	/* finish up */
1695
	spin_lock_irqsave(ap->lock, flags);
1696

1697
	*tf = qc->result_tf;
1698 1699 1700
	err_mask = qc->err_mask;

	ata_qc_free(qc);
1701 1702
	link->active_tag = preempted_tag;
	link->sactive = preempted_sactive;
1703
	ap->qc_active = preempted_qc_active;
1704
	ap->nr_active_links = preempted_nr_active_links;
1705

1706
	spin_unlock_irqrestore(ap->lock, flags);
1707

1708 1709 1710
	if ((err_mask & AC_ERR_TIMEOUT) && auto_timeout)
		ata_internal_cmd_timed_out(dev, command);

1711
	return err_mask;
1712 1713
}

1714
/**
1715
 *	ata_exec_internal - execute libata internal command
1716 1717 1718
 *	@dev: Device to which the command is sent
 *	@tf: Taskfile registers for the command and the result
 *	@cdb: CDB for packet command
1719
 *	@dma_dir: Data transfer direction of the command
1720 1721
 *	@buf: Data buffer of the command
 *	@buflen: Length of data buffer
1722
 *	@timeout: Timeout in msecs (0 for default)
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734
 *
 *	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,
1735 1736
			   int dma_dir, void *buf, unsigned int buflen,
			   unsigned long timeout)
1737
{
1738 1739
	struct scatterlist *psg = NULL, sg;
	unsigned int n_elem = 0;
1740

1741 1742 1743 1744 1745 1746
	if (dma_dir != DMA_NONE) {
		WARN_ON(!buf);
		sg_init_one(&sg, buf, buflen);
		psg = &sg;
		n_elem++;
	}
1747

1748 1749
	return ata_exec_internal_sg(dev, tf, cdb, dma_dir, psg, n_elem,
				    timeout);
1750 1751
}

1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764
/**
 *	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
1765
 */
1766
unsigned int ata_do_simple_cmd(struct ata_device *dev, u8 cmd)
1767 1768 1769 1770 1771 1772 1773 1774 1775
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);

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

1776
	return ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
1777 1778
}

1779 1780 1781 1782 1783 1784 1785 1786 1787
/**
 *	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)
{
1788 1789 1790 1791 1792 1793 1794 1795 1796
	/* 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.
	 */
1797
	if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
1798
		return 0;
1799 1800 1801 1802
	/* 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;
1803 1804 1805 1806 1807
	/* 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))
1808
		return 1;
1809 1810
	return 0;
}
1811

1812 1813 1814 1815 1816 1817 1818 1819 1820
/**
 *	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)
{
1821 1822
	/* If we have no drive specific rule, then PIO 2 is non IORDY */
	if (adev->id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE */
1823
		u16 pio = adev->id[ATA_ID_EIDE_PIO];
1824 1825 1826 1827
		/* 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 */
1828 1829
				return 3 << ATA_SHIFT_PIO;
			return 7 << ATA_SHIFT_PIO;
1830 1831
		}
	}
1832
	return 3 << ATA_SHIFT_PIO;
1833 1834
}

1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851
/**
 *	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
1852
/**
1853 1854 1855
 *	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)
1856
 *	@flags: ATA_READID_* flags
1857
 *	@id: buffer to read IDENTIFY data into
L
Linus Torvalds 已提交
1858
 *
1859 1860
 *	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
1861 1862
 *	devices.  This function also issues ATA_CMD_INIT_DEV_PARAMS
 *	for pre-ATA4 drives.
L
Linus Torvalds 已提交
1863
 *
1864
 *	FIXME: ATA_CMD_ID_ATA is optional for early drives and right
1865
 *	now we abort if we hit that case.
1866
 *
L
Linus Torvalds 已提交
1867
 *	LOCKING:
1868 1869 1870 1871
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
L
Linus Torvalds 已提交
1872
 */
1873
int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class,
1874
		    unsigned int flags, u16 *id)
L
Linus Torvalds 已提交
1875
{
1876
	struct ata_port *ap = dev->link->ap;
1877
	unsigned int class = *p_class;
1878
	struct ata_taskfile tf;
1879 1880
	unsigned int err_mask = 0;
	const char *reason;
1881
	bool is_semb = class == ATA_DEV_SEMB;
1882
	int may_fallback = 1, tried_spinup = 0;
1883
	int rc;
L
Linus Torvalds 已提交
1884

1885
	if (ata_msg_ctl(ap))
1886
		ata_dev_dbg(dev, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
1887

1888
retry:
T
Tejun Heo 已提交
1889
	ata_tf_init(dev, &tf);
1890

1891
	switch (class) {
1892 1893
	case ATA_DEV_SEMB:
		class = ATA_DEV_ATA;	/* some hard drives report SEMB sig */
1894
	case ATA_DEV_ATA:
1895
	case ATA_DEV_ZAC:
1896
		tf.command = ATA_CMD_ID_ATA;
1897 1898
		break;
	case ATA_DEV_ATAPI:
1899
		tf.command = ATA_CMD_ID_ATAPI;
1900 1901 1902 1903 1904
		break;
	default:
		rc = -ENODEV;
		reason = "unsupported class";
		goto err_out;
L
Linus Torvalds 已提交
1905 1906
	}

1907
	tf.protocol = ATA_PROT_PIO;
1908 1909 1910 1911 1912 1913 1914 1915 1916 1917

	/* 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
1918

1919 1920 1921 1922 1923
	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);

1924
	if (err_mask) {
1925
		if (err_mask & AC_ERR_NODEV_HINT) {
1926
			ata_dev_dbg(dev, "NODEV after polling detection\n");
1927 1928 1929
			return -ENOENT;
		}

1930
		if (is_semb) {
1931 1932
			ata_dev_info(dev,
		     "IDENTIFY failed on device w/ SEMB sig, disabled\n");
1933 1934 1935 1936 1937
			/* SEMB is not supported yet */
			*p_class = ATA_DEV_SEMB_UNSUP;
			return 0;
		}

1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957
		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.
			 */
1958 1959
			ata_dev_dbg(dev,
				    "both IDENTIFYs aborted, assuming NODEV\n");
1960
			return -ENOENT;
1961 1962
		}

1963 1964
		rc = -EIO;
		reason = "I/O error";
L
Linus Torvalds 已提交
1965 1966 1967
		goto err_out;
	}

1968
	if (dev->horkage & ATA_HORKAGE_DUMP_ID) {
1969 1970 1971
		ata_dev_dbg(dev, "dumping IDENTIFY data, "
			    "class=%d may_fallback=%d tried_spinup=%d\n",
			    class, may_fallback, tried_spinup);
1972 1973 1974 1975
		print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET,
			       16, 2, id, ATA_ID_WORDS * sizeof(*id), true);
	}

1976 1977 1978 1979 1980
	/* Falling back doesn't make sense if ID data was read
	 * successfully at least once.
	 */
	may_fallback = 0;

1981
	swap_buf_le16(id, ATA_ID_WORDS);
L
Linus Torvalds 已提交
1982

1983
	/* sanity check */
1984
	rc = -EINVAL;
1985
	reason = "device reports invalid type";
1986

1987
	if (class == ATA_DEV_ATA || class == ATA_DEV_ZAC) {
1988 1989
		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
			goto err_out;
1990 1991 1992 1993 1994 1995
		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;
		}
1996 1997 1998
	} else {
		if (ata_id_is_ata(id))
			goto err_out;
1999 2000
	}

2001 2002 2003 2004 2005 2006 2007
	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.
		 */
2008
		err_mask = ata_dev_set_feature(dev, SETFEATURES_SPINUP, 0);
2009
		if (err_mask && id[2] != 0x738c) {
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
			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;
	}

2022 2023
	if ((flags & ATA_READID_POSTRESET) &&
	    (class == ATA_DEV_ATA || class == ATA_DEV_ZAC)) {
2024 2025 2026
		/*
		 * The exact sequence expected by certain pre-ATA4 drives is:
		 * SRST RESET
2027 2028
		 * IDENTIFY (optional in early ATA)
		 * INITIALIZE DEVICE PARAMETERS (later IDE and ATA)
2029 2030
		 * anything else..
		 * Some drives were very specific about that exact sequence.
2031 2032
		 *
		 * Note that ATA4 says lba is mandatory so the second check
2033
		 * should never trigger.
2034 2035
		 */
		if (ata_id_major_version(id) < 4 || !ata_id_has_lba(id)) {
T
Tejun Heo 已提交
2036
			err_mask = ata_dev_init_params(dev, id[3], id[6]);
2037 2038 2039 2040 2041 2042 2043 2044 2045
			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.
			 */
2046
			flags &= ~ATA_READID_POSTRESET;
2047 2048 2049 2050 2051
			goto retry;
		}
	}

	*p_class = class;
2052

2053 2054 2055
	return 0;

 err_out:
2056
	if (ata_msg_warn(ap))
2057 2058
		ata_dev_warn(dev, "failed to IDENTIFY (%s, err_mask=0x%x)\n",
			     reason, err_mask);
2059 2060 2061
	return rc;
}

2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087
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) {
2088 2089
		ata_dev_info(dev, "applying link speed limit horkage to %s\n",
			     sata_spd_string(target));
2090 2091 2092 2093 2094
		return -EAGAIN;
	}
	return 0;
}

T
Tejun Heo 已提交
2095
static inline u8 ata_dev_knobble(struct ata_device *dev)
2096
{
2097
	struct ata_port *ap = dev->link->ap;
2098 2099 2100 2101

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

2102
	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
2103 2104
}

2105
static int ata_dev_config_ncq(struct ata_device *dev,
2106 2107
			       char *desc, size_t desc_sz)
{
2108
	struct ata_port *ap = dev->link->ap;
2109
	int hdepth = 0, ddepth = ata_id_queue_depth(dev->id);
2110 2111
	unsigned int err_mask;
	char *aa_desc = "";
2112 2113 2114

	if (!ata_id_has_ncq(dev->id)) {
		desc[0] = '\0';
2115
		return 0;
2116
	}
2117
	if (dev->horkage & ATA_HORKAGE_NONCQ) {
2118
		snprintf(desc, desc_sz, "NCQ (not used)");
2119
		return 0;
2120
	}
2121
	if (ap->flags & ATA_FLAG_NCQ) {
J
Jeff Garzik 已提交
2122
		hdepth = min(ap->scsi_host->can_queue, ATA_MAX_QUEUE - 1);
2123 2124 2125
		dev->flags |= ATA_DFLAG_NCQ;
	}

2126 2127 2128 2129 2130 2131
	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) {
2132 2133 2134
			ata_dev_err(dev,
				    "failed to enable AA (error_mask=0x%x)\n",
				    err_mask);
2135 2136 2137 2138 2139 2140 2141 2142
			if (err_mask != AC_ERR_DEV) {
				dev->horkage |= ATA_HORKAGE_BROKEN_FPDMA_AA;
				return -EIO;
			}
		} else
			aa_desc = ", AA";
	}

2143
	if (hdepth >= ddepth)
2144
		snprintf(desc, desc_sz, "NCQ (depth %d)%s", ddepth, aa_desc);
2145
	else
2146 2147
		snprintf(desc, desc_sz, "NCQ (depth %d/%d)%s", hdepth,
			ddepth, aa_desc);
2148 2149 2150 2151 2152 2153 2154 2155 2156 2157

	if ((ap->flags & ATA_FLAG_FPDMA_AUX) &&
	    ata_id_has_ncq_send_and_recv(dev->id)) {
		err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_SEND_RECV,
					     0, ap->sector_buf, 1);
		if (err_mask) {
			ata_dev_dbg(dev,
				    "failed to get NCQ Send/Recv Log Emask 0x%x\n",
				    err_mask);
		} else {
2158 2159
			u8 *cmds = dev->ncq_send_recv_cmds;

2160
			dev->flags |= ATA_DFLAG_NCQ_SEND_RECV;
2161 2162 2163 2164 2165 2166 2167
			memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_SEND_RECV_SIZE);

			if (dev->horkage & ATA_HORKAGE_NO_NCQ_TRIM) {
				ata_dev_dbg(dev, "disabling queued TRIM support\n");
				cmds[ATA_LOG_NCQ_SEND_RECV_DSM_OFFSET] &=
					~ATA_LOG_NCQ_SEND_RECV_DSM_TRIM;
			}
2168 2169 2170
		}
	}

2171
	return 0;
2172 2173
}

2174
/**
2175 2176 2177 2178 2179
 *	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.
2180 2181
 *
 *	LOCKING:
2182 2183 2184 2185
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise
2186
 */
2187
int ata_dev_configure(struct ata_device *dev)
2188
{
2189 2190
	struct ata_port *ap = dev->link->ap;
	struct ata_eh_context *ehc = &dev->link->eh_context;
2191
	int print_info = ehc->i.flags & ATA_EHI_PRINTINFO;
2192
	const u16 *id = dev->id;
2193
	unsigned long xfer_mask;
2194
	unsigned int err_mask;
2195
	char revbuf[7];		/* XYZ-99\0 */
2196 2197
	char fwrevbuf[ATA_ID_FW_REV_LEN+1];
	char modelbuf[ATA_ID_PROD_LEN+1];
2198
	int rc;
2199

2200
	if (!ata_dev_enabled(dev) && ata_msg_info(ap)) {
2201
		ata_dev_info(dev, "%s: ENTER/EXIT -- nodev\n", __func__);
2202
		return 0;
2203 2204
	}

2205
	if (ata_msg_probe(ap))
2206
		ata_dev_dbg(dev, "%s: ENTER\n", __func__);
L
Linus Torvalds 已提交
2207

2208 2209
	/* set horkage */
	dev->horkage |= ata_dev_blacklisted(dev);
2210
	ata_force_horkage(dev);
2211

2212
	if (dev->horkage & ATA_HORKAGE_DISABLE) {
2213
		ata_dev_info(dev, "unsupported device, disabling\n");
2214 2215 2216 2217
		ata_dev_disable(dev);
		return 0;
	}

2218 2219
	if ((!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) &&
	    dev->class == ATA_DEV_ATAPI) {
2220 2221 2222
		ata_dev_warn(dev, "WARNING: ATAPI is %s, device ignored\n",
			     atapi_enabled ? "not supported with this driver"
			     : "disabled");
2223 2224 2225 2226
		ata_dev_disable(dev);
		return 0;
	}

2227 2228 2229 2230
	rc = ata_do_link_spd_horkage(dev);
	if (rc)
		return rc;

2231 2232 2233 2234 2235 2236 2237 2238 2239 2240
	/* some WD SATA-1 drives have issues with LPM, turn on NOLPM for them */
	if ((dev->horkage & ATA_HORKAGE_WD_BROKEN_LPM) &&
	    (id[ATA_ID_SATA_CAPABILITY] & 0xe) == 0x2)
		dev->horkage |= ATA_HORKAGE_NOLPM;

	if (dev->horkage & ATA_HORKAGE_NOLPM) {
		ata_dev_warn(dev, "LPM support broken, forcing max_power\n");
		dev->link->ap->target_lpm_policy = ATA_LPM_MAX_POWER;
	}

2241 2242 2243 2244
	/* let ACPI work its magic */
	rc = ata_acpi_on_devcfg(dev);
	if (rc)
		return rc;
2245

2246 2247 2248 2249 2250
	/* massage HPA, do it early as it might change IDENTIFY data */
	rc = ata_hpa_resize(dev);
	if (rc)
		return rc;

2251
	/* print device capabilities */
2252
	if (ata_msg_probe(ap))
2253 2254 2255 2256 2257 2258
		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]);
2259

2260
	/* initialize to-be-configured parameters */
2261
	dev->flags &= ~ATA_DFLAG_CFG_MASK;
2262 2263 2264 2265 2266 2267
	dev->max_sectors = 0;
	dev->cdb_len = 0;
	dev->n_sectors = 0;
	dev->cylinders = 0;
	dev->heads = 0;
	dev->sectors = 0;
2268
	dev->multi_count = 0;
2269

L
Linus Torvalds 已提交
2270 2271 2272 2273
	/*
	 * common ATA, ATAPI feature tests
	 */

2274
	/* find max transfer mode; for printk only */
2275
	xfer_mask = ata_id_xfermask(id);
L
Linus Torvalds 已提交
2276

2277 2278
	if (ata_msg_probe(ap))
		ata_dump_id(id);
L
Linus Torvalds 已提交
2279

2280 2281 2282 2283 2284 2285 2286
	/* 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
2287
	/* ATA-specific feature tests */
2288
	if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
2289
		if (ata_id_is_cfa(id)) {
2290 2291
			/* CPRM may make this media unusable */
			if (id[ATA_ID_CFA_KEY_MGMT] & 1)
2292 2293
				ata_dev_warn(dev,
	"supports DRM functions and may not be fully accessible\n");
2294
			snprintf(revbuf, 7, "CFA");
2295
		} else {
2296
			snprintf(revbuf, 7, "ATA-%d", ata_id_major_version(id));
2297 2298
			/* Warn the user if the device has TPM extensions */
			if (ata_id_has_tpm(id))
2299 2300
				ata_dev_warn(dev,
	"supports DRM functions and may not be fully accessible\n");
2301
		}
2302

2303
		dev->n_sectors = ata_id_n_sectors(id);
2304

2305 2306 2307 2308 2309 2310 2311 2312 2313
		/* 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;
		}
2314

2315
		if (ata_id_has_lba(id)) {
2316
			const char *lba_desc;
2317
			char ncq_desc[24];
2318

2319 2320
			lba_desc = "LBA";
			dev->flags |= ATA_DFLAG_LBA;
2321
			if (ata_id_has_lba48(id)) {
2322
				dev->flags |= ATA_DFLAG_LBA48;
2323
				lba_desc = "LBA48";
2324 2325 2326 2327

				if (dev->n_sectors >= (1UL << 28) &&
				    ata_id_has_flush_ext(id))
					dev->flags |= ATA_DFLAG_FLUSH_EXT;
2328
			}
2329

2330
			/* config NCQ */
2331 2332 2333
			rc = ata_dev_config_ncq(dev, ncq_desc, sizeof(ncq_desc));
			if (rc)
				return rc;
2334

2335
			/* print device info to dmesg */
2336
			if (ata_msg_drv(ap) && print_info) {
2337 2338 2339 2340 2341
				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",
2342
					(unsigned long long)dev->n_sectors,
2343 2344
					dev->multi_count, lba_desc, ncq_desc);
			}
2345
		} else {
2346 2347 2348
			/* CHS */

			/* Default translation */
2349 2350 2351
			dev->cylinders	= id[1];
			dev->heads	= id[3];
			dev->sectors	= id[6];
2352

2353
			if (ata_id_current_chs_valid(id)) {
2354
				/* Current CHS translation is valid. */
2355 2356 2357
				dev->cylinders = id[54];
				dev->heads     = id[55];
				dev->sectors   = id[56];
2358 2359 2360
			}

			/* print device info to dmesg */
2361
			if (ata_msg_drv(ap) && print_info) {
2362 2363 2364 2365 2366 2367 2368 2369
				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);
2370
			}
2371 2372
		}

2373 2374
		/* Check and mark DevSlp capability. Get DevSlp timing variables
		 * from SATA Settings page of Identify Device Data Log.
2375
		 */
2376
		if (ata_id_has_devslp(dev->id)) {
2377
			u8 *sata_setting = ap->sector_buf;
2378 2379 2380
			int i, j;

			dev->flags |= ATA_DFLAG_DEVSLP;
2381 2382 2383
			err_mask = ata_read_log_page(dev,
						     ATA_LOG_SATA_ID_DEV_DATA,
						     ATA_LOG_SATA_SETTINGS,
2384
						     sata_setting,
2385 2386 2387 2388 2389
						     1);
			if (err_mask)
				ata_dev_dbg(dev,
					    "failed to get Identify Device Data, Emask 0x%x\n",
					    err_mask);
2390 2391 2392 2393 2394
			else
				for (i = 0; i < ATA_LOG_DEVSLP_SIZE; i++) {
					j = ATA_LOG_DEVSLP_OFFSET + i;
					dev->devslp_timing[i] = sata_setting[j];
				}
2395 2396
		}

2397
		dev->cdb_len = 16;
L
Linus Torvalds 已提交
2398 2399 2400
	}

	/* ATAPI-specific feature tests */
2401
	else if (dev->class == ATA_DEV_ATAPI) {
T
Tejun Heo 已提交
2402 2403
		const char *cdb_intr_string = "";
		const char *atapi_an_string = "";
2404
		const char *dma_dir_string = "";
2405
		u32 sntf;
2406

2407
		rc = atapi_cdb_len(id);
L
Linus Torvalds 已提交
2408
		if ((rc < 12) || (rc > ATAPI_CDB_LEN)) {
2409
			if (ata_msg_warn(ap))
2410
				ata_dev_warn(dev, "unsupported CDB len\n");
2411
			rc = -EINVAL;
L
Linus Torvalds 已提交
2412 2413
			goto err_out_nosup;
		}
2414
		dev->cdb_len = (unsigned int) rc;
L
Linus Torvalds 已提交
2415

2416 2417 2418 2419
		/* 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.
2420
		 */
2421 2422
		if (atapi_an &&
		    (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) &&
T
Tejun Heo 已提交
2423
		    (!sata_pmp_attached(ap) ||
2424
		     sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) {
2425
			/* issue SET feature command to turn this on */
2426 2427
			err_mask = ata_dev_set_feature(dev,
					SETFEATURES_SATA_ENABLE, SATA_AN);
T
Tejun Heo 已提交
2428
			if (err_mask)
2429 2430 2431
				ata_dev_err(dev,
					    "failed to enable ATAPI AN (err_mask=0x%x)\n",
					    err_mask);
T
Tejun Heo 已提交
2432
			else {
2433
				dev->flags |= ATA_DFLAG_AN;
T
Tejun Heo 已提交
2434 2435
				atapi_an_string = ", ATAPI AN";
			}
2436 2437
		}

2438
		if (ata_id_cdb_intr(dev->id)) {
2439
			dev->flags |= ATA_DFLAG_CDB_INTR;
2440 2441
			cdb_intr_string = ", CDB intr";
		}
2442

2443
		if (atapi_dmadir || (dev->horkage & ATA_HORKAGE_ATAPI_DMADIR) || atapi_id_dmadir(dev->id)) {
2444 2445 2446 2447
			dev->flags |= ATA_DFLAG_DMADIR;
			dma_dir_string = ", DMADIR";
		}

2448
		if (ata_id_has_da(dev->id)) {
2449
			dev->flags |= ATA_DFLAG_DA;
2450 2451
			zpodd_init(dev);
		}
2452

L
Linus Torvalds 已提交
2453
		/* print device info to dmesg */
2454
		if (ata_msg_drv(ap) && print_info)
2455 2456 2457 2458 2459 2460
			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
2461 2462
	}

2463 2464 2465 2466 2467
	/* determine max_sectors */
	dev->max_sectors = ATA_MAX_SECTORS;
	if (dev->flags & ATA_DFLAG_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2468 2469
	/* Limit PATA drive on SATA cable bridge transfers to udma5,
	   200 sectors */
T
Tejun Heo 已提交
2470
	if (ata_dev_knobble(dev)) {
2471
		if (ata_msg_drv(ap) && print_info)
2472
			ata_dev_info(dev, "applying bridge limits\n");
2473
		dev->udma_mask &= ATA_UDMA5;
2474 2475 2476
		dev->max_sectors = ATA_MAX_SECTORS;
	}

2477
	if ((dev->class == ATA_DEV_ATAPI) &&
2478
	    (atapi_command_packet_set(id) == TYPE_TAPE)) {
2479
		dev->max_sectors = ATA_MAX_SECTORS_TAPE;
2480 2481
		dev->horkage |= ATA_HORKAGE_STUCK_ERR;
	}
2482

2483
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_128)
2484 2485
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
					 dev->max_sectors);
2486

2487 2488 2489
	if (dev->horkage & ATA_HORKAGE_MAX_SEC_LBA48)
		dev->max_sectors = ATA_MAX_SECTORS_LBA48;

2490
	if (ap->ops->dev_config)
2491
		ap->ops->dev_config(dev);
2492

2493 2494 2495 2496 2497 2498 2499 2500
	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) {
2501
			ata_dev_warn(dev,
2502
"Drive reports diagnostics failure. This may indicate a drive\n");
2503
			ata_dev_warn(dev,
2504 2505 2506 2507
"fault or invalid emulation. Contact drive vendor for information.\n");
		}
	}

2508
	if ((dev->horkage & ATA_HORKAGE_FIRMWARE_WARN) && print_info) {
2509 2510
		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");
2511 2512
	}

2513
	return 0;
L
Linus Torvalds 已提交
2514 2515

err_out_nosup:
2516
	if (ata_msg_probe(ap))
2517
		ata_dev_dbg(dev, "%s: EXIT, err\n", __func__);
2518
	return rc;
L
Linus Torvalds 已提交
2519 2520
}

A
Alan Cox 已提交
2521
/**
2522
 *	ata_cable_40wire	-	return 40 wire cable type
A
Alan Cox 已提交
2523 2524
 *	@ap: port
 *
2525
 *	Helper method for drivers which want to hardwire 40 wire cable
A
Alan Cox 已提交
2526 2527 2528 2529 2530 2531 2532 2533 2534
 *	detection.
 */

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

/**
2535
 *	ata_cable_80wire	-	return 80 wire cable type
A
Alan Cox 已提交
2536 2537
 *	@ap: port
 *
2538
 *	Helper method for drivers which want to hardwire 80 wire cable
A
Alan Cox 已提交
2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558
 *	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
2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570
/**
 *	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
2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582
/**
 *	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
2583 2584 2585 2586
/**
 *	ata_bus_probe - Reset and probe ATA bus
 *	@ap: Bus to probe
 *
J
Jeff Garzik 已提交
2587 2588 2589 2590
 *	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
2591
 *	LOCKING:
J
Jeff Garzik 已提交
2592
 *	PCI/etc. bus probe sem.
L
Linus Torvalds 已提交
2593 2594
 *
 *	RETURNS:
2595
 *	Zero on success, negative errno otherwise.
L
Linus Torvalds 已提交
2596 2597
 */

2598
int ata_bus_probe(struct ata_port *ap)
L
Linus Torvalds 已提交
2599
{
2600
	unsigned int classes[ATA_MAX_DEVICES];
2601
	int tries[ATA_MAX_DEVICES];
2602
	int rc;
2603
	struct ata_device *dev;
L
Linus Torvalds 已提交
2604

T
Tejun Heo 已提交
2605
	ata_for_each_dev(dev, &ap->link, ALL)
2606
		tries[dev->devno] = ATA_PROBE_MAX_TRIES;
2607 2608

 retry:
T
Tejun Heo 已提交
2609
	ata_for_each_dev(dev, &ap->link, ALL) {
2610 2611 2612 2613 2614 2615 2616 2617
		/* 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;
2618
		dev->dma_mode = 0xff;
2619 2620 2621 2622 2623 2624 2625 2626 2627 2628

		/* 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);
	}

2629
	/* reset and determine device classes */
2630
	ap->ops->phy_reset(ap);
2631

T
Tejun Heo 已提交
2632
	ata_for_each_dev(dev, &ap->link, ALL) {
2633
		if (dev->class != ATA_DEV_UNKNOWN)
2634 2635 2636
			classes[dev->devno] = dev->class;
		else
			classes[dev->devno] = ATA_DEV_NONE;
2637

2638
		dev->class = ATA_DEV_UNKNOWN;
2639
	}
L
Linus Torvalds 已提交
2640

2641 2642 2643 2644
	/* 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
2645
	ata_for_each_dev(dev, &ap->link, ALL_REVERSE) {
2646 2647
		if (tries[dev->devno])
			dev->class = classes[dev->devno];
2648

2649
		if (!ata_dev_enabled(dev))
2650 2651
			continue;

2652 2653
		rc = ata_dev_read_id(dev, &dev->class, ATA_READID_POSTRESET,
				     dev->id);
2654 2655
		if (rc)
			goto fail;
2656 2657
	}

A
Alan Cox 已提交
2658 2659 2660 2661
	/* 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
2662 2663 2664 2665 2666 2667
	/* 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
2668 2669 2670
		if (ata_id_is_sata(dev->id))
			ap->cbl = ATA_CBL_SATA;

2671 2672 2673
	/* 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
2674
	ata_for_each_dev(dev, &ap->link, ENABLED) {
2675
		ap->link.eh_context.i.flags |= ATA_EHI_PRINTINFO;
2676
		rc = ata_dev_configure(dev);
2677
		ap->link.eh_context.i.flags &= ~ATA_EHI_PRINTINFO;
2678 2679
		if (rc)
			goto fail;
L
Linus Torvalds 已提交
2680 2681
	}

2682
	/* configure transfer mode */
2683
	rc = ata_set_mode(&ap->link, &dev);
2684
	if (rc)
2685
		goto fail;
L
Linus Torvalds 已提交
2686

T
Tejun Heo 已提交
2687 2688
	ata_for_each_dev(dev, &ap->link, ENABLED)
		return 0;
L
Linus Torvalds 已提交
2689

2690
	return -ENODEV;
2691 2692

 fail:
2693 2694
	tries[dev->devno]--;

2695 2696
	switch (rc) {
	case -EINVAL:
2697
		/* eeek, something went very wrong, give up */
2698 2699
		tries[dev->devno] = 0;
		break;
2700 2701 2702 2703

	case -ENODEV:
		/* give it just one more chance */
		tries[dev->devno] = min(tries[dev->devno], 1);
2704
	case -EIO:
2705 2706 2707 2708
		if (tries[dev->devno] == 1) {
			/* This is the last chance, better to slow
			 * down than lose it.
			 */
2709
			sata_down_spd_limit(&ap->link, 0);
2710 2711
			ata_down_xfermask_limit(dev, ATA_DNXFER_PIO);
		}
2712 2713
	}

2714
	if (!tries[dev->devno])
T
Tejun Heo 已提交
2715
		ata_dev_disable(dev);
2716

2717
	goto retry;
L
Linus Torvalds 已提交
2718 2719
}

2720 2721
/**
 *	sata_print_link_status - Print SATA link status
2722
 *	@link: SATA link to printk link status about
2723 2724 2725 2726 2727 2728
 *
 *	This function prints link speed and status of a SATA link.
 *
 *	LOCKING:
 *	None.
 */
2729
static void sata_print_link_status(struct ata_link *link)
2730
{
2731
	u32 sstatus, scontrol, tmp;
2732

2733
	if (sata_scr_read(link, SCR_STATUS, &sstatus))
2734
		return;
2735
	sata_scr_read(link, SCR_CONTROL, &scontrol);
2736

T
Tejun Heo 已提交
2737
	if (ata_phys_link_online(link)) {
2738
		tmp = (sstatus >> 4) & 0xf;
2739 2740
		ata_link_info(link, "SATA link up %s (SStatus %X SControl %X)\n",
			      sata_spd_string(tmp), sstatus, scontrol);
2741
	} else {
2742 2743
		ata_link_info(link, "SATA link down (SStatus %X SControl %X)\n",
			      sstatus, scontrol);
2744 2745 2746
	}
}

2747 2748 2749 2750 2751 2752 2753
/**
 *	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
 */
2754

T
Tejun Heo 已提交
2755
struct ata_device *ata_dev_pair(struct ata_device *adev)
2756
{
2757 2758
	struct ata_link *link = adev->link;
	struct ata_device *pair = &link->device[1 - adev->devno];
2759
	if (!ata_dev_enabled(pair))
2760 2761 2762 2763
		return NULL;
	return pair;
}

2764
/**
2765
 *	sata_down_spd_limit - adjust SATA spd limit downward
2766
 *	@link: Link to adjust SATA spd limit for
2767
 *	@spd_limit: Additional limit
2768
 *
2769
 *	Adjust SATA spd limit of @link downward.  Note that this
2770
 *	function only adjusts the limit.  The change must be applied
2771
 *	using sata_set_spd().
2772
 *
2773 2774 2775 2776 2777
 *	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.
 *
2778 2779 2780 2781 2782 2783
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 on success, negative errno on failure
 */
2784
int sata_down_spd_limit(struct ata_link *link, u32 spd_limit)
2785
{
2786
	u32 sstatus, spd, mask;
2787
	int rc, bit;
2788

2789
	if (!sata_scr_valid(link))
2790 2791 2792
		return -EOPNOTSUPP;

	/* If SCR can be read, use it to determine the current SPD.
2793
	 * If not, use cached value in link->sata_spd.
2794
	 */
2795
	rc = sata_scr_read(link, SCR_STATUS, &sstatus);
2796
	if (rc == 0 && ata_sstatus_online(sstatus))
2797 2798
		spd = (sstatus >> 4) & 0xf;
	else
2799
		spd = link->sata_spd;
2800

2801
	mask = link->sata_spd_limit;
2802 2803
	if (mask <= 1)
		return -EINVAL;
2804 2805

	/* unconditionally mask off the highest bit */
2806 2807
	bit = fls(mask) - 1;
	mask &= ~(1 << bit);
2808

2809 2810 2811 2812 2813 2814 2815 2816 2817
	/* 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? */
2818 2819 2820
	if (!mask)
		return -EINVAL;

2821 2822 2823 2824 2825 2826 2827 2828 2829
	if (spd_limit) {
		if (mask & ((1 << spd_limit) - 1))
			mask &= (1 << spd_limit) - 1;
		else {
			bit = ffs(mask) - 1;
			mask = 1 << bit;
		}
	}

2830
	link->sata_spd_limit = mask;
2831

2832 2833
	ata_link_warn(link, "limiting SATA link speed to %s\n",
		      sata_spd_string(fls(mask)));
2834 2835 2836 2837

	return 0;
}

2838
static int __sata_set_spd_needed(struct ata_link *link, u32 *scontrol)
2839
{
2840 2841
	struct ata_link *host_link = &link->ap->link;
	u32 limit, target, spd;
2842

2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853
	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;
2854
	else
2855
		target = fls(limit);
2856 2857

	spd = (*scontrol >> 4) & 0xf;
2858
	*scontrol = (*scontrol & ~0xf0) | ((target & 0xf) << 4);
2859

2860
	return spd != target;
2861 2862 2863
}

/**
2864
 *	sata_set_spd_needed - is SATA spd configuration needed
2865
 *	@link: Link in question
2866 2867
 *
 *	Test whether the spd limit in SControl matches
2868
 *	@link->sata_spd_limit.  This function is used to determine
2869 2870 2871 2872 2873 2874 2875 2876 2877
 *	whether hardreset is necessary to apply SATA spd
 *	configuration.
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	1 if SATA spd configuration is needed, 0 otherwise.
 */
2878
static int sata_set_spd_needed(struct ata_link *link)
2879 2880 2881
{
	u32 scontrol;

2882
	if (sata_scr_read(link, SCR_CONTROL, &scontrol))
2883
		return 1;
2884

2885
	return __sata_set_spd_needed(link, &scontrol);
2886 2887 2888
}

/**
2889
 *	sata_set_spd - set SATA spd according to spd limit
2890
 *	@link: Link to set SATA spd for
2891
 *
2892
 *	Set SATA spd of @link according to sata_spd_limit.
2893 2894 2895 2896 2897 2898
 *
 *	LOCKING:
 *	Inherited from caller.
 *
 *	RETURNS:
 *	0 if spd doesn't need to be changed, 1 if spd has been
2899
 *	changed.  Negative errno if SCR registers are inaccessible.
2900
 */
2901
int sata_set_spd(struct ata_link *link)
2902 2903
{
	u32 scontrol;
2904
	int rc;
2905

2906
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
2907
		return rc;
2908

2909
	if (!__sata_set_spd_needed(link, &scontrol))
2910 2911
		return 0;

2912
	if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
2913 2914
		return rc;

2915 2916 2917
	return 1;
}

2918 2919 2920 2921 2922
/*
 * This mode timing computation functionality is ported over from
 * drivers/ide/ide-timing.h and was originally written by Vojtech Pavlik
 */
/*
2923
 * PIO 0-4, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
2924
 * These were taken from ATA/ATAPI-6 standard, rev 0a, except
2925 2926 2927
 * for UDMA6, which is currently supported only by Maxtor drives.
 *
 * For PIO 5/6 MWDMA 3/4 see the CFA specification 3.0.
2928 2929 2930
 */

static const struct ata_timing ata_timing[] = {
2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957
/*	{ 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 },
2958 2959 2960 2961

	{ 0xFF }
};

2962 2963
#define ENOUGH(v, unit)		(((v)-1)/(unit)+1)
#define EZ(v, unit)		((v)?ENOUGH(v, unit):0)
2964 2965 2966

static void ata_timing_quantize(const struct ata_timing *t, struct ata_timing *q, int T, int UT)
{
2967 2968 2969 2970 2971 2972 2973 2974 2975
	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);
2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986
}

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);
2987
	if (what & ATA_TIMING_DMACK_HOLD) m->dmack_hold = max(a->dmack_hold, b->dmack_hold);
2988 2989 2990 2991
	if (what & ATA_TIMING_CYCLE  ) m->cycle   = max(a->cycle,   b->cycle);
	if (what & ATA_TIMING_UDMA   ) m->udma    = max(a->udma,    b->udma);
}

2992
const struct ata_timing *ata_timing_find_mode(u8 xfer_mode)
2993
{
2994 2995 2996 2997
	const struct ata_timing *t = ata_timing;

	while (xfer_mode > t->mode)
		t++;
2998

2999 3000
	if (xfer_mode == t->mode)
		return t;
3001 3002 3003 3004

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

3005
	return NULL;
3006 3007 3008 3009 3010
}

int ata_timing_compute(struct ata_device *adev, unsigned short speed,
		       struct ata_timing *t, int T, int UT)
{
3011
	const u16 *id = adev->id;
3012 3013 3014 3015
	const struct ata_timing *s;
	struct ata_timing p;

	/*
3016
	 * Find the mode.
3017
	 */
3018 3019 3020 3021

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

3022 3023
	memcpy(t, s, sizeof(*s));

3024 3025 3026 3027 3028
	/*
	 * If the drive is an EIDE drive, it can tell us it needs extended
	 * PIO/MW_DMA cycle timing.
	 */

3029
	if (id[ATA_ID_FIELD_VALID] & 2) {	/* EIDE drive */
3030
		memset(&p, 0, sizeof(p));
3031

3032
		if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {
3033 3034 3035 3036 3037 3038 3039 3040
			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];

3041 3042 3043 3044 3045 3046 3047
		ata_timing_merge(&p, t, t, ATA_TIMING_CYCLE | ATA_TIMING_CYC8B);
	}

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

3048
	ata_timing_quantize(t, t, T, UT);
3049 3050

	/*
3051 3052 3053
	 * 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.
3054 3055
	 */

3056
	if (speed > XFER_PIO_6) {
3057 3058 3059 3060 3061
		ata_timing_compute(adev, adev->pio_mode, &p, T, UT);
		ata_timing_merge(&p, t, t, ATA_TIMING_ALL);
	}

	/*
3062
	 * Lengthen active & recovery time so that cycle time is correct.
3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073
	 */

	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;
	}
3074

3075 3076 3077 3078 3079
	/* 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;
3080 3081 3082 3083

	return 0;
}

3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134
/**
 *	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;
}

3135 3136 3137
/**
 *	ata_down_xfermask_limit - adjust dev xfer masks downward
 *	@dev: Device to adjust xfer masks
3138
 *	@sel: ATA_DNXFER_* selector
3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149
 *
 *	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
 */
3150
int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel)
3151
{
3152
	char buf[32];
3153 3154
	unsigned long orig_mask, xfer_mask;
	unsigned long pio_mask, mwdma_mask, udma_mask;
3155
	int quiet, highbit;
3156

3157 3158
	quiet = !!(sel & ATA_DNXFER_QUIET);
	sel &= ~ATA_DNXFER_QUIET;
3159

3160 3161 3162 3163
	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);
3164

3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213
	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));

3214
		ata_dev_warn(dev, "limiting speed to %s\n", buf);
3215
	}
3216 3217 3218 3219 3220 3221 3222

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

	return 0;
}

T
Tejun Heo 已提交
3223
static int ata_dev_set_mode(struct ata_device *dev)
L
Linus Torvalds 已提交
3224
{
3225
	struct ata_port *ap = dev->link->ap;
3226
	struct ata_eh_context *ehc = &dev->link->eh_context;
3227
	const bool nosetxfer = dev->horkage & ATA_HORKAGE_NOSETXFER;
3228 3229
	const char *dev_err_whine = "";
	int ign_dev_err = 0;
3230
	unsigned int err_mask = 0;
3231
	int rc;
L
Linus Torvalds 已提交
3232

3233
	dev->flags &= ~ATA_DFLAG_PIO;
L
Linus Torvalds 已提交
3234 3235 3236
	if (dev->xfer_shift == ATA_SHIFT_PIO)
		dev->flags |= ATA_DFLAG_PIO;

3237 3238 3239 3240
	if (nosetxfer && ap->flags & ATA_FLAG_SATA && ata_id_is_sata(dev->id))
		dev_err_whine = " (SET_XFERMODE skipped)";
	else {
		if (nosetxfer)
3241 3242 3243
			ata_dev_warn(dev,
				     "NOSETXFER but PATA detected - can't "
				     "skip SETXFER, might malfunction\n");
3244 3245
		err_mask = ata_dev_set_xfermode(dev);
	}
3246

3247 3248 3249 3250 3251 3252 3253 3254 3255 3256
	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;

3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271
	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;
	}
3272 3273
	/* 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 */
3274
	if (dev->xfer_shift == ATA_SHIFT_MWDMA &&
3275 3276
	    dev->dma_mode == XFER_MW_DMA_0 &&
	    (dev->id[63] >> 8) & 1)
3277
		ign_dev_err = 1;
3278

3279 3280 3281
	/* 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
3282

3283 3284 3285 3286 3287 3288
	if (err_mask & AC_ERR_DEV) {
		if (!ign_dev_err)
			goto fail;
		else
			dev_err_whine = " (device error ignored)";
	}
3289

3290 3291
	DPRINTK("xfer_shift=%u, xfer_mode=0x%x\n",
		dev->xfer_shift, (int)dev->xfer_mode);
L
Linus Torvalds 已提交
3292

3293 3294 3295
	ata_dev_info(dev, "configured for %s%s\n",
		     ata_mode_string(ata_xfer_mode2mask(dev->xfer_mode)),
		     dev_err_whine);
3296

3297
	return 0;
3298 3299

 fail:
3300
	ata_dev_err(dev, "failed to set xfermode (err_mask=0x%x)\n", err_mask);
3301
	return -EIO;
L
Linus Torvalds 已提交
3302 3303 3304
}

/**
3305
 *	ata_do_set_mode - Program timings and issue SET FEATURES - XFER
3306
 *	@link: link on which timings will be programmed
3307
 *	@r_failed_dev: out parameter for failed device
L
Linus Torvalds 已提交
3308
 *
3309 3310 3311
 *	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
3312
 *	returned in @r_failed_dev.
J
Jeff Garzik 已提交
3313
 *
L
Linus Torvalds 已提交
3314
 *	LOCKING:
J
Jeff Garzik 已提交
3315
 *	PCI/etc. bus probe sem.
3316 3317 3318
 *
 *	RETURNS:
 *	0 on success, negative errno otherwise
L
Linus Torvalds 已提交
3319
 */
3320

3321
int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev)
L
Linus Torvalds 已提交
3322
{
3323
	struct ata_port *ap = link->ap;
3324
	struct ata_device *dev;
3325
	int rc = 0, used_dma = 0, found = 0;
3326

3327
	/* step 1: calculate xfer_mask */
T
Tejun Heo 已提交
3328
	ata_for_each_dev(dev, link, ENABLED) {
3329
		unsigned long pio_mask, dma_mask;
3330
		unsigned int mode_mask;
3331

3332 3333 3334 3335 3336 3337
		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
3338
		ata_dev_xfermask(dev);
3339
		ata_force_xfermask(dev);
L
Linus Torvalds 已提交
3340

3341
		pio_mask = ata_pack_xfermask(dev->pio_mask, 0, 0);
3342 3343

		if (libata_dma_mask & mode_mask)
3344 3345
			dma_mask = ata_pack_xfermask(0, dev->mwdma_mask,
						     dev->udma_mask);
3346 3347 3348
		else
			dma_mask = 0;

3349 3350
		dev->pio_mode = ata_xfer_mask2mode(pio_mask);
		dev->dma_mode = ata_xfer_mask2mode(dma_mask);
3351

3352
		found = 1;
3353
		if (ata_dma_enabled(dev))
3354
			used_dma = 1;
3355
	}
3356
	if (!found)
3357
		goto out;
3358 3359

	/* step 2: always set host PIO timings */
T
Tejun Heo 已提交
3360
	ata_for_each_dev(dev, link, ENABLED) {
3361
		if (dev->pio_mode == 0xff) {
3362
			ata_dev_warn(dev, "no PIO support\n");
3363
			rc = -EINVAL;
3364
			goto out;
3365 3366 3367 3368 3369 3370 3371
		}

		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
3372

3373
	/* step 3: set host DMA timings */
T
Tejun Heo 已提交
3374 3375
	ata_for_each_dev(dev, link, ENABLED) {
		if (!ata_dma_enabled(dev))
3376 3377 3378 3379 3380 3381 3382
			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
3383 3384

	/* step 4: update devices' xfer mode */
T
Tejun Heo 已提交
3385
	ata_for_each_dev(dev, link, ENABLED) {
T
Tejun Heo 已提交
3386
		rc = ata_dev_set_mode(dev);
3387
		if (rc)
3388
			goto out;
3389
	}
L
Linus Torvalds 已提交
3390

3391 3392
	/* Record simplex status. If we selected DMA then the other
	 * host channels are not permitted to do so.
3393
	 */
J
Jeff Garzik 已提交
3394
	if (used_dma && (ap->host->flags & ATA_HOST_SIMPLEX))
A
Alan 已提交
3395
		ap->host->simplex_claimed = ap;
3396

3397 3398 3399 3400
 out:
	if (rc)
		*r_failed_dev = dev;
	return rc;
L
Linus Torvalds 已提交
3401 3402
}

3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426
/**
 *	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;
3427
	unsigned long nodev_deadline;
3428 3429
	int warned = 0;

3430 3431 3432 3433 3434 3435
	/* 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
3436 3437 3438 3439 3440 3441
	/* 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);

3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452
	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;

3453 3454
		/*
		 * -ENODEV could be transient.  Ignore -ENODEV if link
3455
		 * is online.  Also, some SATA devices take a long
3456 3457 3458
		 * time to clear 0xff after reset.  Wait for
		 * ATA_TMOUT_FF_WAIT[_LONG] on -ENODEV if link isn't
		 * offline.
3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479
		 *
		 * 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)) {
3480
			ata_link_warn(link,
3481 3482 3483 3484 3485
				"link is slow to respond, please be patient "
				"(ready=%d)\n", tmp);
			warned = 1;
		}

3486
		ata_msleep(link->ap, 50);
3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503
	}
}

/**
 *	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.
 */
3504
int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
3505 3506
				int (*check_ready)(struct ata_link *link))
{
3507
	ata_msleep(link->ap, ATA_WAIT_AFTER_RESET);
3508 3509 3510 3511

	return ata_wait_ready(link, deadline, check_ready);
}

3512
/**
3513 3514
 *	sata_link_debounce - debounce SATA phy status
 *	@link: ATA link to debounce SATA phy status for
3515
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3516
 *	@deadline: deadline jiffies for the operation
3517
 *
3518
 *	Make sure SStatus of @link reaches stable state, determined by
3519 3520
 *	holding the same value where DET is not 1 for @duration polled
 *	every @interval, before @timeout.  Timeout constraints the
3521 3522
 *	beginning of the stable state.  Because DET gets stuck at 1 on
 *	some controllers after hot unplugging, this functions waits
3523 3524
 *	until timeout then returns 0 if DET is stable at 1.
 *
3525 3526 3527
 *	@timeout is further limited by @deadline.  The sooner of the
 *	two is used.
 *
3528 3529 3530 3531 3532 3533
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3534 3535
int sata_link_debounce(struct ata_link *link, const unsigned long *params,
		       unsigned long deadline)
3536
{
3537 3538
	unsigned long interval = params[0];
	unsigned long duration = params[1];
3539
	unsigned long last_jiffies, t;
3540 3541 3542
	u32 last, cur;
	int rc;

3543
	t = ata_deadline(jiffies, params[2]);
3544 3545 3546
	if (time_before(t, deadline))
		deadline = t;

3547
	if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3548 3549 3550 3551 3552 3553 3554
		return rc;
	cur &= 0xf;

	last = cur;
	last_jiffies = jiffies;

	while (1) {
3555
		ata_msleep(link->ap, interval);
3556
		if ((rc = sata_scr_read(link, SCR_STATUS, &cur)))
3557 3558 3559 3560 3561
			return rc;
		cur &= 0xf;

		/* DET stable? */
		if (cur == last) {
3562
			if (cur == 1 && time_before(jiffies, deadline))
3563
				continue;
3564 3565
			if (time_after(jiffies,
				       ata_deadline(last_jiffies, duration)))
3566 3567 3568 3569 3570 3571 3572 3573
				return 0;
			continue;
		}

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

3574 3575 3576
		/* Check deadline.  If debouncing failed, return
		 * -EPIPE to tell upper layer to lower link speed.
		 */
3577
		if (time_after(jiffies, deadline))
3578
			return -EPIPE;
3579 3580 3581 3582
	}
}

/**
3583 3584
 *	sata_link_resume - resume SATA link
 *	@link: ATA link to resume SATA
3585
 *	@params: timing parameters { interval, duratinon, timeout } in msec
3586
 *	@deadline: deadline jiffies for the operation
3587
 *
3588
 *	Resume SATA phy @link and debounce it.
3589 3590 3591 3592 3593 3594 3595
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno on failure.
 */
3596 3597
int sata_link_resume(struct ata_link *link, const unsigned long *params,
		     unsigned long deadline)
3598
{
3599
	int tries = ATA_LINK_RESUME_TRIES;
3600
	u32 scontrol, serror;
3601 3602
	int rc;

3603
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3604
		return rc;
3605

3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619
	/*
	 * 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.
		 */
3620
		ata_msleep(link->ap, 200);
3621

3622 3623 3624 3625
		/* is SControl restored correctly? */
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
			return rc;
	} while ((scontrol & 0xf0f) != 0x300 && --tries);
3626

3627
	if ((scontrol & 0xf0f) != 0x300) {
3628
		ata_link_warn(link, "failed to resume link (SControl %X)\n",
3629
			     scontrol);
3630 3631 3632 3633
		return 0;
	}

	if (tries < ATA_LINK_RESUME_TRIES)
3634 3635
		ata_link_warn(link, "link resume succeeded after %d retries\n",
			      ATA_LINK_RESUME_TRIES - tries);
3636

3637 3638 3639
	if ((rc = sata_link_debounce(link, params, deadline)))
		return rc;

3640
	/* clear SError, some PHYs require this even for SRST to work */
3641 3642 3643
	if (!(rc = sata_scr_read(link, SCR_ERROR, &serror)))
		rc = sata_scr_write(link, SCR_ERROR, serror);

3644
	return rc != -EINVAL ? rc : 0;
3645 3646
}

3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679
/**
 *	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 */
3680
		scontrol |= (0x7 << 8);
3681 3682 3683 3684 3685 3686 3687 3688 3689
		/* 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);
3690
		scontrol |= (0x6 << 8);
3691 3692
		break;
	case ATA_LPM_MIN_POWER:
3693 3694
		if (ata_link_nr_enabled(link) > 0)
			/* no restrictions on LPM transitions */
3695
			scontrol &= ~(0x7 << 8);
3696 3697 3698 3699 3700
		else {
			/* empty port, power off */
			scontrol &= ~0xf;
			scontrol |= (0x1 << 2);
		}
3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718
		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);
}

3719
/**
3720
 *	ata_std_prereset - prepare for reset
T
Tejun Heo 已提交
3721
 *	@link: ATA link to be reset
3722
 *	@deadline: deadline jiffies for the operation
3723
 *
T
Tejun Heo 已提交
3724
 *	@link is about to be reset.  Initialize it.  Failure from
3725 3726 3727 3728
 *	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.
3729 3730 3731 3732 3733 3734 3735
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3736
int ata_std_prereset(struct ata_link *link, unsigned long deadline)
3737
{
T
Tejun Heo 已提交
3738
	struct ata_port *ap = link->ap;
3739
	struct ata_eh_context *ehc = &link->eh_context;
3740
	const unsigned long *timing = sata_ehc_deb_timing(ehc);
3741 3742 3743 3744 3745 3746
	int rc;

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

3747
	/* if SATA, resume link */
3748
	if (ap->flags & ATA_FLAG_SATA) {
3749
		rc = sata_link_resume(link, timing, deadline);
3750 3751
		/* whine about phy resume failure but proceed */
		if (rc && rc != -EOPNOTSUPP)
3752 3753 3754
			ata_link_warn(link,
				      "failed to resume link for reset (errno=%d)\n",
				      rc);
3755 3756
	}

3757
	/* no point in trying softreset on offline link */
T
Tejun Heo 已提交
3758
	if (ata_phys_link_offline(link))
3759 3760
		ehc->i.action &= ~ATA_EH_SOFTRESET;

3761 3762 3763
	return 0;
}

3764
/**
3765 3766 3767
 *	sata_link_hardreset - reset link via SATA phy reset
 *	@link: link to reset
 *	@timing: timing parameters { interval, duratinon, timeout } in msec
3768
 *	@deadline: deadline jiffies for the operation
3769 3770
 *	@online: optional out parameter indicating link onlineness
 *	@check_ready: optional callback to check link readiness
3771
 *
3772
 *	SATA phy-reset @link using DET bits of SControl register.
3773 3774 3775 3776 3777 3778 3779 3780
 *	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.
3781 3782 3783 3784 3785 3786 3787
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
3788
int sata_link_hardreset(struct ata_link *link, const unsigned long *timing,
3789 3790
			unsigned long deadline,
			bool *online, int (*check_ready)(struct ata_link *))
3791
{
3792
	u32 scontrol;
3793
	int rc;
3794

3795 3796
	DPRINTK("ENTER\n");

3797 3798 3799
	if (online)
		*online = false;

3800
	if (sata_set_spd_needed(link)) {
3801 3802 3803 3804 3805
		/* 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.
		 */
3806
		if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3807
			goto out;
3808

3809
		scontrol = (scontrol & 0x0f0) | 0x304;
3810

3811
		if ((rc = sata_scr_write(link, SCR_CONTROL, scontrol)))
3812
			goto out;
3813

3814
		sata_set_spd(link);
3815 3816 3817
	}

	/* issue phy wake/reset */
3818
	if ((rc = sata_scr_read(link, SCR_CONTROL, &scontrol)))
3819
		goto out;
3820

3821
	scontrol = (scontrol & 0x0f0) | 0x301;
3822

3823
	if ((rc = sata_scr_write_flush(link, SCR_CONTROL, scontrol)))
3824
		goto out;
3825

3826
	/* Couldn't find anything in SATA I/II specs, but AHCI-1.1
3827 3828
	 * 10.4.2 says at least 1 ms.
	 */
3829
	ata_msleep(link->ap, 1);
3830

3831 3832
	/* bring link back */
	rc = sata_link_resume(link, timing, deadline);
3833 3834 3835
	if (rc)
		goto out;
	/* if link is offline nothing more to do */
T
Tejun Heo 已提交
3836
	if (ata_phys_link_offline(link))
3837 3838 3839 3840 3841 3842
		goto out;

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

T
Tejun Heo 已提交
3843
	if (sata_pmp_supported(link->ap) && ata_is_host_link(link)) {
3844 3845 3846 3847 3848 3849 3850 3851
		/* 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;

3852 3853
			pmp_deadline = ata_deadline(jiffies,
						    ATA_TMOUT_PMP_SRST_WAIT);
3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864
			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);
3865
 out:
3866 3867 3868 3869
	if (rc && rc != -EAGAIN) {
		/* online is set iff link is online && reset succeeded */
		if (online)
			*online = false;
3870
		ata_link_err(link, "COMRESET failed (errno=%d)\n", rc);
3871
	}
3872 3873 3874 3875
	DPRINTK("EXIT, rc=%d\n", rc);
	return rc;
}

3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901
/**
 *	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;
}

3902
/**
3903
 *	ata_std_postreset - standard postreset callback
T
Tejun Heo 已提交
3904
 *	@link: the target ata_link
3905 3906 3907 3908 3909 3910 3911 3912 3913
 *	@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)
 */
3914
void ata_std_postreset(struct ata_link *link, unsigned int *classes)
3915
{
3916 3917
	u32 serror;

3918 3919
	DPRINTK("ENTER\n");

3920 3921 3922 3923
	/* reset complete, clear SError */
	if (!sata_scr_read(link, SCR_ERROR, &serror))
		sata_scr_write(link, SCR_ERROR, serror);

3924
	/* print link status */
3925
	sata_print_link_status(link);
3926 3927 3928 3929

	DPRINTK("EXIT\n");
}

3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945
/**
 *	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
3946 3947
static int ata_dev_same_device(struct ata_device *dev, unsigned int new_class,
			       const u16 *new_id)
3948 3949
{
	const u16 *old_id = dev->id;
3950 3951
	unsigned char model[2][ATA_ID_PROD_LEN + 1];
	unsigned char serial[2][ATA_ID_SERNO_LEN + 1];
3952 3953

	if (dev->class != new_class) {
3954 3955
		ata_dev_info(dev, "class mismatch %d != %d\n",
			     dev->class, new_class);
3956 3957 3958
		return 0;
	}

3959 3960 3961 3962
	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]));
3963 3964

	if (strcmp(model[0], model[1])) {
3965 3966
		ata_dev_info(dev, "model number mismatch '%s' != '%s'\n",
			     model[0], model[1]);
3967 3968 3969 3970
		return 0;
	}

	if (strcmp(serial[0], serial[1])) {
3971 3972
		ata_dev_info(dev, "serial number mismatch '%s' != '%s'\n",
			     serial[0], serial[1]);
3973 3974 3975 3976 3977 3978 3979
		return 0;
	}

	return 1;
}

/**
3980
 *	ata_dev_reread_id - Re-read IDENTIFY data
3981
 *	@dev: target ATA device
3982
 *	@readid_flags: read ID flags
3983 3984 3985 3986 3987 3988 3989 3990 3991 3992
 *
 *	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
 */
3993
int ata_dev_reread_id(struct ata_device *dev, unsigned int readid_flags)
3994
{
3995
	unsigned int class = dev->class;
3996
	u16 *id = (void *)dev->link->ap->sector_buf;
3997 3998
	int rc;

3999
	/* read ID data */
4000
	rc = ata_dev_read_id(dev, &class, readid_flags, id);
4001
	if (rc)
4002
		return rc;
4003 4004

	/* is the device still there? */
4005 4006
	if (!ata_dev_same_device(dev, class, id))
		return -ENODEV;
4007

4008
	memcpy(dev->id, id, sizeof(id[0]) * ATA_ID_WORDS);
4009 4010 4011 4012 4013 4014
	return 0;
}

/**
 *	ata_dev_revalidate - Revalidate ATA device
 *	@dev: device to revalidate
4015
 *	@new_class: new class code
4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026
 *	@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
 */
4027 4028
int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
		       unsigned int readid_flags)
4029
{
4030
	u64 n_sectors = dev->n_sectors;
4031
	u64 n_native_sectors = dev->n_native_sectors;
4032 4033 4034 4035 4036
	int rc;

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

4037 4038
	/* fail early if !ATA && !ATAPI to avoid issuing [P]IDENTIFY to PMP */
	if (ata_class_enabled(new_class) &&
4039 4040
	    new_class != ATA_DEV_ATA &&
	    new_class != ATA_DEV_ATAPI &&
4041
	    new_class != ATA_DEV_ZAC &&
4042
	    new_class != ATA_DEV_SEMB) {
4043 4044
		ata_dev_info(dev, "class mismatch %u != %u\n",
			     dev->class, new_class);
4045 4046 4047 4048
		rc = -ENODEV;
		goto fail;
	}

4049 4050 4051 4052
	/* re-read ID */
	rc = ata_dev_reread_id(dev, readid_flags);
	if (rc)
		goto fail;
4053 4054

	/* configure device according to the new ID */
4055
	rc = ata_dev_configure(dev);
4056 4057 4058 4059
	if (rc)
		goto fail;

	/* verify n_sectors hasn't changed */
4060 4061 4062 4063 4064
	if (dev->class != ATA_DEV_ATA || !n_sectors ||
	    dev->n_sectors == n_sectors)
		return 0;

	/* n_sectors has changed */
4065 4066 4067
	ata_dev_warn(dev, "n_sectors mismatch %llu != %llu\n",
		     (unsigned long long)n_sectors,
		     (unsigned long long)dev->n_sectors);
4068 4069 4070 4071 4072 4073 4074 4075

	/*
	 * 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) {
4076 4077 4078
		ata_dev_warn(dev,
			     "new n_sectors matches native, probably "
			     "late HPA unlock, n_sectors updated\n");
4079
		/* use the larger n_sectors */
4080
		return 0;
4081 4082
	}

4083 4084 4085 4086 4087 4088 4089 4090 4091
	/*
	 * 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)) {
4092 4093 4094
		ata_dev_warn(dev,
			     "old n_sectors matches native, probably "
			     "late HPA lock, will try to unlock HPA\n");
4095 4096 4097 4098 4099
		/* try unlocking HPA */
		dev->flags |= ATA_DFLAG_UNLOCK_HPA;
		rc = -EIO;
	} else
		rc = -ENODEV;
4100

4101 4102 4103
	/* restore original n_[native_]sectors and fail */
	dev->n_native_sectors = n_native_sectors;
	dev->n_sectors = n_sectors;
4104
 fail:
4105
	ata_dev_err(dev, "revalidation failed (errno=%d)\n", rc);
4106 4107 4108
	return rc;
}

4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125
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 },
4126
	{ "CRD-848[02]B",	NULL,		ATA_HORKAGE_NODMA },
4127 4128 4129 4130 4131
	{ "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 },
4132
	{ "HITACHI CDR-8[34]35",NULL,		ATA_HORKAGE_NODMA },
4133 4134 4135 4136 4137 4138 4139 4140 4141 4142
	{ "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 },
4143
	{ "SAMSUNG CD-ROM SN-124", "N001",	ATA_HORKAGE_NODMA },
4144
	{ "Seagate STT20000A", NULL,		ATA_HORKAGE_NODMA },
4145
	{ " 2GB ATA Flash Disk", "ADMA428M",	ATA_HORKAGE_NODMA },
4146
	/* Odd clown on sil3726/4726 PMPs */
4147
	{ "Config  Disk",	NULL,		ATA_HORKAGE_DISABLE },
4148

4149
	/* Weird ATAPI devices */
4150
	{ "TORiSAN DVD-ROM DRD-N216", NULL,	ATA_HORKAGE_MAX_SEC_128 },
4151
	{ "QUANTUM DAT    DAT72-000", NULL,	ATA_HORKAGE_ATAPI_MOD16_DMA },
4152
	{ "Slimtype DVD A  DS8A8SH", NULL,	ATA_HORKAGE_MAX_SEC_LBA48 },
4153
	{ "Slimtype DVD A  DS8A9SH", NULL,	ATA_HORKAGE_MAX_SEC_LBA48 },
4154

4155 4156 4157 4158
	/* Devices we expect to fail diagnostics */

	/* Devices where NCQ should be avoided */
	/* NCQ is slow */
4159
	{ "WDC WD740ADFD-00",	NULL,		ATA_HORKAGE_NONCQ },
4160
	{ "WDC WD740ADFD-00NLR1", NULL,		ATA_HORKAGE_NONCQ, },
4161 4162
	/* http://thread.gmane.org/gmane.linux.ide/14907 */
	{ "FUJITSU MHT2060BH",	NULL,		ATA_HORKAGE_NONCQ },
4163
	/* NCQ is broken */
4164
	{ "Maxtor *",		"BANC*",	ATA_HORKAGE_NONCQ },
4165
	{ "Maxtor 7V300F0",	"VA111630",	ATA_HORKAGE_NONCQ },
4166
	{ "ST380817AS",		"3.42",		ATA_HORKAGE_NONCQ },
4167
	{ "ST3160023AS",	"3.42",		ATA_HORKAGE_NONCQ },
4168
	{ "OCZ CORE_SSD",	"02.10104",	ATA_HORKAGE_NONCQ },
4169

4170
	/* Seagate NCQ + FLUSH CACHE firmware bug */
4171
	{ "ST31500341AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4172
						ATA_HORKAGE_FIRMWARE_WARN },
4173

4174
	{ "ST31000333AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4175 4176
						ATA_HORKAGE_FIRMWARE_WARN },

4177
	{ "ST3640[36]23AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4178 4179
						ATA_HORKAGE_FIRMWARE_WARN },

4180
	{ "ST3320[68]13AS",	"SD1[5-9]",	ATA_HORKAGE_NONCQ |
4181 4182
						ATA_HORKAGE_FIRMWARE_WARN },

4183 4184
	/* Seagate Momentus SpinPoint M8 seem to have FPMDA_AA issues */
	{ "ST1000LM024 HN-M101MBB", "2AR10001",	ATA_HORKAGE_BROKEN_FPDMA_AA },
4185
	{ "ST1000LM024 HN-M101MBB", "2BA30001",	ATA_HORKAGE_BROKEN_FPDMA_AA },
4186

4187 4188 4189 4190 4191
	/* 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, },
4192

4193 4194 4195
	/* https://bugzilla.kernel.org/show_bug.cgi?id=15573 */
	{ "C300-CTFDDAC128MAG",	"0001",		ATA_HORKAGE_NONCQ, },

4196 4197 4198 4199 4200
	/* 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 },
4201

4202 4203 4204
	/* this one allows HPA unlocking but fails IOs on the area */
	{ "OCZ-VERTEX",		    "1.30",	ATA_HORKAGE_BROKEN_HPA },

4205 4206 4207
	/* Devices which report 1 sector over size HPA */
	{ "ST340823A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
	{ "ST320413A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4208
	{ "ST310211A",		NULL,		ATA_HORKAGE_HPA_SIZE, },
4209

4210 4211
	/* Devices which get the IVB wrong */
	{ "QUANTUM FIREBALLlct10 05", "A03.0900", ATA_HORKAGE_IVB, },
4212
	/* Maybe we should just blacklist TSSTcorp... */
4213
	{ "TSSTcorp CDDVDW SH-S202[HJN]", "SB0[01]",  ATA_HORKAGE_IVB, },
4214

4215 4216
	/* Devices that do not need bridging limits applied */
	{ "MTRON MSP-SATA*",		NULL,	ATA_HORKAGE_BRIDGE_OK, },
4217
	{ "BUFFALO HD-QSU2/R5",		NULL,	ATA_HORKAGE_BRIDGE_OK, },
4218

4219 4220
	/* Devices which aren't very happy with higher link speeds */
	{ "WD My Book",			NULL,	ATA_HORKAGE_1_5_GBPS, },
4221
	{ "Seagate FreeAgent GoFlex",	NULL,	ATA_HORKAGE_1_5_GBPS, },
4222

4223 4224 4225 4226
	/*
	 * Devices which choke on SETXFER.  Applies only if both the
	 * device and controller are SATA.
	 */
4227
	{ "PIONEER DVD-RW  DVRTD08",	NULL,	ATA_HORKAGE_NOSETXFER },
4228 4229
	{ "PIONEER DVD-RW  DVRTD08A",	NULL,	ATA_HORKAGE_NOSETXFER },
	{ "PIONEER DVD-RW  DVR-215",	NULL,	ATA_HORKAGE_NOSETXFER },
4230 4231
	{ "PIONEER DVD-RW  DVR-212D",	NULL,	ATA_HORKAGE_NOSETXFER },
	{ "PIONEER DVD-RW  DVR-216D",	NULL,	ATA_HORKAGE_NOSETXFER },
4232

4233
	/* devices that don't properly handle queued TRIM commands */
4234 4235 4236
	{ "Micron_M500*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM, },
	{ "Crucial_CT???M500SSD*",	NULL,	ATA_HORKAGE_NO_NCQ_TRIM, },
	{ "Micron_M550*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM, },
4237
	{ "Crucial_CT*M550SSD*",	NULL,	ATA_HORKAGE_NO_NCQ_TRIM, },
4238

4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255
	/*
	 * Some WD SATA-I drives spin up and down erratically when the link
	 * is put into the slumber mode.  We don't have full list of the
	 * affected devices.  Disable LPM if the device matches one of the
	 * known prefixes and is SATA-1.  As a side effect LPM partial is
	 * lost too.
	 *
	 * https://bugzilla.kernel.org/show_bug.cgi?id=57211
	 */
	{ "WDC WD800JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
	{ "WDC WD1200JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
	{ "WDC WD1600JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
	{ "WDC WD2000JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
	{ "WDC WD2500JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
	{ "WDC WD3000JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },
	{ "WDC WD3200JD-*",		NULL,	ATA_HORKAGE_WD_BROKEN_LPM },

4256 4257
	/* End Marker */
	{ }
L
Linus Torvalds 已提交
4258
};
4259

4260
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
L
Linus Torvalds 已提交
4261
{
T
Tejun Heo 已提交
4262 4263
	unsigned char model_num[ATA_ID_PROD_LEN + 1];
	unsigned char model_rev[ATA_ID_FW_REV_LEN + 1];
4264
	const struct ata_blacklist_entry *ad = ata_device_blacklist;
4265

T
Tejun Heo 已提交
4266 4267
	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
4268

4269
	while (ad->model_num) {
4270
		if (glob_match(ad->model_num, model_num)) {
4271 4272
			if (ad->model_rev == NULL)
				return ad->horkage;
4273
			if (glob_match(ad->model_rev, model_rev))
4274
				return ad->horkage;
4275
		}
4276
		ad++;
4277
	}
L
Linus Torvalds 已提交
4278 4279 4280
	return 0;
}

4281 4282 4283 4284 4285 4286
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.
	 */
4287
	if ((dev->link->ap->flags & ATA_FLAG_PIO_POLLING) &&
4288 4289
	    (dev->flags & ATA_DFLAG_CDB_INTR))
		return 1;
4290
	return (dev->horkage & ATA_HORKAGE_NODMA) ? 1 : 0;
4291 4292
}

4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307
/**
 *	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);
}

4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325
/**
 *	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;

4326
	/* If the controller thinks we are 40 wire, we are. */
4327 4328
	if (ap->cbl == ATA_CBL_PATA40)
		return 1;
4329 4330

	/* If the controller thinks we are 80 wire, we are. */
4331 4332
	if (ap->cbl == ATA_CBL_PATA80 || ap->cbl == ATA_CBL_SATA)
		return 0;
4333 4334 4335 4336 4337

	/* 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
4338 4339
	if (ap->cbl == ATA_CBL_PATA40_SHORT)
		return 0;
4340 4341 4342 4343 4344 4345 4346 4347 4348 4349

	/* 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
4350 4351 4352
	ata_for_each_link(link, ap, EDGE) {
		ata_for_each_dev(dev, link, ENABLED) {
			if (!ata_is_40wire(dev))
4353 4354 4355 4356 4357 4358
				return 0;
		}
	}
	return 1;
}

4359 4360 4361 4362
/**
 *	ata_dev_xfermask - Compute supported xfermask of the given device
 *	@dev: Device to compute xfermask for
 *
4363 4364 4365 4366
 *	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...
4367 4368 4369 4370
 *
 *	LOCKING:
 *	None.
 */
T
Tejun Heo 已提交
4371
static void ata_dev_xfermask(struct ata_device *dev)
L
Linus Torvalds 已提交
4372
{
4373 4374
	struct ata_link *link = dev->link;
	struct ata_port *ap = link->ap;
J
Jeff Garzik 已提交
4375
	struct ata_host *host = ap->host;
4376
	unsigned long xfer_mask;
L
Linus Torvalds 已提交
4377

4378
	/* controller modes available */
4379 4380 4381
	xfer_mask = ata_pack_xfermask(ap->pio_mask,
				      ap->mwdma_mask, ap->udma_mask);

4382
	/* drive modes available */
4383 4384 4385
	xfer_mask &= ata_pack_xfermask(dev->pio_mask,
				       dev->mwdma_mask, dev->udma_mask);
	xfer_mask &= ata_id_xfermask(dev->id);
4386

4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397
	/*
	 *	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));
	}

4398 4399
	if (ata_dma_blacklisted(dev)) {
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4400 4401
		ata_dev_warn(dev,
			     "device is on DMA blacklist, disabling DMA\n");
4402
	}
4403

4404
	if ((host->flags & ATA_HOST_SIMPLEX) &&
4405
	    host->simplex_claimed && host->simplex_claimed != ap) {
4406
		xfer_mask &= ~(ATA_MASK_MWDMA | ATA_MASK_UDMA);
4407 4408
		ata_dev_warn(dev,
			     "simplex DMA is claimed by other device, disabling DMA\n");
4409
	}
4410

4411 4412 4413
	if (ap->flags & ATA_FLAG_NO_IORDY)
		xfer_mask &= ata_pio_mask_no_iordy(dev);

4414
	if (ap->ops->mode_filter)
4415
		xfer_mask = ap->ops->mode_filter(dev, xfer_mask);
4416

4417 4418 4419 4420 4421 4422 4423 4424 4425 4426
	/* 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 */
4427
		if (cable_is_40wire(ap)) {
4428 4429
			ata_dev_warn(dev,
				     "limited to UDMA/33 due to 40-wire cable\n");
4430 4431 4432
			xfer_mask &= ~(0xF8 << ATA_SHIFT_UDMA);
		}

4433 4434
	ata_unpack_xfermask(xfer_mask, &dev->pio_mask,
			    &dev->mwdma_mask, &dev->udma_mask);
L
Linus Torvalds 已提交
4435 4436 4437 4438 4439 4440
}

/**
 *	ata_dev_set_xfermode - Issue SET FEATURES - XFER MODE command
 *	@dev: Device to which command will be sent
 *
J
Jeff Garzik 已提交
4441 4442 4443
 *	Issue SET FEATURES - XFER MODE command to device @dev
 *	on port @ap.
 *
L
Linus Torvalds 已提交
4444
 *	LOCKING:
J
Jeff Garzik 已提交
4445
 *	PCI/etc. bus probe sem.
4446 4447 4448
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
L
Linus Torvalds 已提交
4449 4450
 */

T
Tejun Heo 已提交
4451
static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
L
Linus Torvalds 已提交
4452
{
4453
	struct ata_taskfile tf;
4454
	unsigned int err_mask;
L
Linus Torvalds 已提交
4455 4456 4457 4458

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

4459 4460 4461
	/* Some controllers and ATAPI devices show flaky interrupt
	 * behavior after setting xfer mode.  Use polling instead.
	 */
T
Tejun Heo 已提交
4462
	ata_tf_init(dev, &tf);
4463 4464
	tf.command = ATA_CMD_SET_FEATURES;
	tf.feature = SETFEATURES_XFER;
4465
	tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_POLLING;
4466
	tf.protocol = ATA_PROT_NODATA;
A
Alan Cox 已提交
4467
	/* If we are using IORDY we must send the mode setting command */
J
Jeff Garzik 已提交
4468 4469
	if (ata_pio_need_iordy(dev))
		tf.nsect = dev->xfer_mode;
A
Alan Cox 已提交
4470 4471
	/* 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
4472
		tf.nsect = 0x01;
A
Alan Cox 已提交
4473 4474
	else /* In the ancient relic department - skip all of this */
		return 0;
L
Linus Torvalds 已提交
4475

4476
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4477 4478 4479 4480

	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
}
4481

4482
/**
4483
 *	ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
4484 4485
 *	@dev: Device to which command will be sent
 *	@enable: Whether to enable or disable the feature
4486
 *	@feature: The sector count represents the feature to set
4487 4488
 *
 *	Issue SET FEATURES - SATA FEATURES command to device @dev
4489
 *	on port @ap with sector count
4490 4491 4492 4493 4494 4495 4496
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
 */
4497
unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509
{
	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;
4510
	tf.nsect = feature;
4511

4512
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
L
Linus Torvalds 已提交
4513

4514 4515
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
L
Linus Torvalds 已提交
4516
}
4517
EXPORT_SYMBOL_GPL(ata_dev_set_feature);
L
Linus Torvalds 已提交
4518

4519 4520 4521
/**
 *	ata_dev_init_params - Issue INIT DEV PARAMS command
 *	@dev: Device to which command will be sent
4522 4523
 *	@heads: Number of heads (taskfile parameter)
 *	@sectors: Number of sectors (taskfile parameter)
4524 4525
 *
 *	LOCKING:
4526 4527 4528 4529
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, AC_ERR_* mask otherwise.
4530
 */
T
Tejun Heo 已提交
4531 4532
static unsigned int ata_dev_init_params(struct ata_device *dev,
					u16 heads, u16 sectors)
4533
{
4534
	struct ata_taskfile tf;
4535
	unsigned int err_mask;
4536 4537 4538

	/* Number of sectors per track 1-255. Number of heads 1-16 */
	if (sectors < 1 || sectors > 255 || heads < 1 || heads > 16)
4539
		return AC_ERR_INVALID;
4540 4541 4542 4543

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

T
Tejun Heo 已提交
4544
	ata_tf_init(dev, &tf);
4545 4546 4547 4548 4549
	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 */
4550

4551
	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0);
4552 4553 4554 4555 4556
	/* 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;
4557

4558 4559
	DPRINTK("EXIT, err_mask=%x\n", err_mask);
	return err_mask;
4560 4561
}

L
Linus Torvalds 已提交
4562
/**
J
Jeff Garzik 已提交
4563 4564 4565 4566
 *	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
4567 4568
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4569
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
4570
 */
4571
void ata_sg_clean(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4572 4573
{
	struct ata_port *ap = qc->ap;
T
Tejun Heo 已提交
4574
	struct scatterlist *sg = qc->sg;
L
Linus Torvalds 已提交
4575 4576
	int dir = qc->dma_dir;

4577
	WARN_ON_ONCE(sg == NULL);
L
Linus Torvalds 已提交
4578

4579
	VPRINTK("unmapping %u sg elements\n", qc->n_elem);
L
Linus Torvalds 已提交
4580

4581
	if (qc->n_elem)
4582
		dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir);
L
Linus Torvalds 已提交
4583 4584

	qc->flags &= ~ATA_QCFLAG_DMAMAP;
T
Tejun Heo 已提交
4585
	qc->sg = NULL;
L
Linus Torvalds 已提交
4586 4587 4588
}

/**
4589
 *	atapi_check_dma - Check whether ATAPI DMA can be supported
L
Linus Torvalds 已提交
4590 4591
 *	@qc: Metadata associated with taskfile to check
 *
J
Jeff Garzik 已提交
4592 4593 4594 4595
 *	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
4596
 *	LOCKING:
4597 4598 4599 4600 4601
 *	spin_lock_irqsave(host lock)
 *
 *	RETURNS: 0 when ATAPI DMA can be used
 *               nonzero otherwise
 */
4602
int atapi_check_dma(struct ata_queued_cmd *qc)
4603 4604
{
	struct ata_port *ap = qc->ap;
4605

4606 4607 4608
	/* Don't allow DMA if it isn't multiple of 16 bytes.  Quite a
	 * few ATAPI devices choke on such DMA requests.
	 */
4609 4610
	if (!(qc->dev->horkage & ATA_HORKAGE_ATAPI_MOD16_DMA) &&
	    unlikely(qc->nbytes & 15))
4611
		return 1;
4612

4613 4614
	if (ap->ops->check_atapi_dma)
		return ap->ops->check_atapi_dma(qc);
4615

4616 4617
	return 0;
}
L
Linus Torvalds 已提交
4618

4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636
/**
 *	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;
4637

4638 4639 4640 4641 4642 4643 4644
	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;
	}
4645

4646 4647
	return ATA_DEFER_LINK;
}
4648

4649
void ata_noop_qc_prep(struct ata_queued_cmd *qc) { }
L
Linus Torvalds 已提交
4650

4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670
/**
 *	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;
}
4671

4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688
/**
 *	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
4689

4690
	VPRINTK("ENTER, ata%u\n", ap->print_id);
4691

4692 4693 4694
	n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir);
	if (n_elem < 1)
		return -1;
4695

4696
	DPRINTK("%d sg elements mapped\n", n_elem);
4697
	qc->orig_n_elem = qc->n_elem;
4698 4699
	qc->n_elem = n_elem;
	qc->flags |= ATA_QCFLAG_DMAMAP;
L
Linus Torvalds 已提交
4700

4701
	return 0;
L
Linus Torvalds 已提交
4702 4703
}

4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716
/**
 *	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)
4717
{
4718 4719
#ifdef __BIG_ENDIAN
	unsigned int i;
4720

4721 4722 4723
	for (i = 0; i < buf_words; i++)
		buf[i] = le16_to_cpu(buf[i]);
#endif /* __BIG_ENDIAN */
4724 4725
}

4726
/**
4727 4728
 *	ata_qc_new_init - Request an available ATA command, and initialize it
 *	@dev: Device from whom we request an available command structure
4729
 *
4730 4731 4732 4733
 *	LOCKING:
 *	None.
 */

4734
struct ata_queued_cmd *ata_qc_new_init(struct ata_device *dev, int tag)
S
Shaohua Li 已提交
4735
{
4736
	struct ata_port *ap = dev->link->ap;
S
Shaohua Li 已提交
4737 4738 4739 4740 4741 4742
	struct ata_queued_cmd *qc;

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

4743 4744 4745 4746 4747
	/* libsas case */
	if (!ap->scsi_host) {
		tag = ata_sas_allocate_tag(ap);
		if (tag < 0)
			return NULL;
S
Shaohua Li 已提交
4748 4749
	}

4750 4751 4752 4753 4754
	qc = __ata_qc_from_tag(ap, tag);
	qc->tag = tag;
	qc->scsicmd = NULL;
	qc->ap = ap;
	qc->dev = dev;
L
Linus Torvalds 已提交
4755

4756
	ata_qc_reinit(qc);
L
Linus Torvalds 已提交
4757 4758 4759 4760

	return qc;
}

4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772
/**
 *	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)
{
4773
	struct ata_port *ap;
4774 4775
	unsigned int tag;

4776
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
4777
	ap = qc->ap;
4778 4779 4780 4781 4782

	qc->flags = 0;
	tag = qc->tag;
	if (likely(ata_tag_valid(tag))) {
		qc->tag = ATA_TAG_POISON;
4783 4784
		if (!ap->scsi_host)
			ata_sas_free_tag(tag, ap);
4785 4786 4787
	}
}

4788
void __ata_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
4789
{
4790 4791
	struct ata_port *ap;
	struct ata_link *link;
4792

4793 4794
	WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
	WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
4795 4796
	ap = qc->ap;
	link = qc->dev->link;
L
Linus Torvalds 已提交
4797 4798 4799 4800

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

4801
	/* command should be marked inactive atomically with qc completion */
4802
	if (qc->tf.protocol == ATA_PROT_NCQ) {
4803
		link->sactive &= ~(1 << qc->tag);
4804 4805 4806
		if (!link->sactive)
			ap->nr_active_links--;
	} else {
4807
		link->active_tag = ATA_TAG_POISON;
4808 4809 4810 4811 4812 4813 4814
		ap->nr_active_links--;
	}

	/* clear exclusive status */
	if (unlikely(qc->flags & ATA_QCFLAG_CLEAR_EXCL &&
		     ap->excl_link == link))
		ap->excl_link = NULL;
4815

4816 4817 4818 4819 4820
	/* 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;
4821
	ap->qc_active &= ~(1 << qc->tag);
4822

L
Linus Torvalds 已提交
4823
	/* call completion callback */
4824
	qc->complete_fn(qc);
L
Linus Torvalds 已提交
4825 4826
}

4827 4828 4829 4830 4831
static void fill_result_tf(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;

	qc->result_tf.flags = qc->tf.flags;
4832
	ap->ops->qc_fill_rtf(qc);
4833 4834
}

4835 4836 4837 4838 4839 4840 4841 4842 4843 4844 4845 4846 4847
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;
}

4848 4849 4850 4851
/**
 *	ata_qc_complete - Complete an active ATA command
 *	@qc: Command to complete
 *
4852 4853 4854 4855 4856 4857 4858
 *	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.
4859 4860
 *
 *	LOCKING:
J
Jeff Garzik 已提交
4861
 *	spin_lock_irqsave(host lock)
4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880
 */
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) {
4881 4882 4883
		struct ata_device *dev = qc->dev;
		struct ata_eh_info *ehi = &dev->link->eh_info;

4884 4885 4886
		if (unlikely(qc->err_mask))
			qc->flags |= ATA_QCFLAG_FAILED;

4887 4888 4889 4890 4891
		/*
		 * Finish internal commands without any further processing
		 * and always with the result TF filled.
		 */
		if (unlikely(ata_tag_internal(qc->tag))) {
4892
			fill_result_tf(qc);
4893 4894 4895
			__ata_qc_complete(qc);
			return;
		}
4896

4897 4898 4899 4900 4901 4902 4903
		/*
		 * 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);
4904
			return;
4905 4906
		}

4907 4908
		WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);

4909 4910
		/* read result TF if requested */
		if (qc->flags & ATA_QCFLAG_RESULT_TF)
4911
			fill_result_tf(qc);
4912

4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927
		/* 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;
4928 4929 4930 4931

		case ATA_CMD_SLEEP:
			dev->flags |= ATA_DFLAG_SLEEPING;
			break;
4932 4933
		}

4934 4935 4936
		if (unlikely(dev->flags & ATA_DFLAG_DUBIOUS_XFER))
			ata_verify_xfer(qc);

4937 4938 4939 4940 4941 4942 4943
		__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)
4944
			fill_result_tf(qc);
4945 4946 4947 4948 4949

		__ata_qc_complete(qc);
	}
}

4950 4951 4952 4953 4954 4955 4956 4957 4958 4959
/**
 *	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.
 *
4960 4961 4962 4963
 *	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.
 *
4964
 *	LOCKING:
J
Jeff Garzik 已提交
4965
 *	spin_lock_irqsave(host lock)
4966 4967 4968 4969
 *
 *	RETURNS:
 *	Number of completed commands on success, -errno otherwise.
 */
4970
int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active)
4971 4972 4973 4974 4975 4976 4977
{
	int nr_done = 0;
	u32 done_mask;

	done_mask = ap->qc_active ^ qc_active;

	if (unlikely(done_mask & qc_active)) {
4978 4979
		ata_port_err(ap, "illegal qc_active transition (%08x->%08x)\n",
			     ap->qc_active, qc_active);
4980 4981 4982
		return -EINVAL;
	}

4983
	while (done_mask) {
4984
		struct ata_queued_cmd *qc;
4985
		unsigned int tag = __ffs(done_mask);
4986

4987 4988
		qc = ata_qc_from_tag(ap, tag);
		if (qc) {
4989 4990 4991
			ata_qc_complete(qc);
			nr_done++;
		}
4992
		done_mask &= ~(1 << tag);
4993 4994 4995 4996 4997
	}

	return nr_done;
}

L
Linus Torvalds 已提交
4998 4999 5000 5001 5002 5003 5004 5005 5006 5007
/**
 *	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
5008
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
5009
 */
5010
void ata_qc_issue(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
5011 5012
{
	struct ata_port *ap = qc->ap;
5013
	struct ata_link *link = qc->dev->link;
5014
	u8 prot = qc->tf.protocol;
L
Linus Torvalds 已提交
5015

5016 5017 5018 5019
	/* 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.
	 */
5020
	WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
5021

5022
	if (ata_is_ncq(prot)) {
5023
		WARN_ON_ONCE(link->sactive & (1 << qc->tag));
5024 5025 5026

		if (!link->sactive)
			ap->nr_active_links++;
5027
		link->sactive |= 1 << qc->tag;
5028
	} else {
5029
		WARN_ON_ONCE(link->sactive);
5030 5031

		ap->nr_active_links++;
5032
		link->active_tag = qc->tag;
5033 5034
	}

5035
	qc->flags |= ATA_QCFLAG_ACTIVE;
5036
	ap->qc_active |= 1 << qc->tag;
5037

5038 5039
	/*
	 * We guarantee to LLDs that they will have at least one
5040 5041
	 * non-zero sg if the command is a data command.
	 */
5042 5043 5044
	if (WARN_ON_ONCE(ata_is_data(prot) &&
			 (!qc->sg || !qc->n_elem || !qc->nbytes)))
		goto sys_err;
5045

5046
	if (ata_is_dma(prot) || (ata_is_pio(prot) &&
5047
				 (ap->flags & ATA_FLAG_PIO_DMA)))
5048
		if (ata_sg_setup(qc))
5049
			goto sys_err;
L
Linus Torvalds 已提交
5050

T
Tejun Heo 已提交
5051
	/* if device is sleeping, schedule reset and abort the link */
5052
	if (unlikely(qc->dev->flags & ATA_DFLAG_SLEEPING)) {
T
Tejun Heo 已提交
5053
		link->eh_info.action |= ATA_EH_RESET;
5054 5055 5056 5057 5058
		ata_ehi_push_desc(&link->eh_info, "waking up from sleep");
		ata_link_abort(link);
		return;
	}

L
Linus Torvalds 已提交
5059 5060
	ap->ops->qc_prep(qc);

5061 5062 5063 5064
	qc->err_mask |= ap->ops->qc_issue(qc);
	if (unlikely(qc->err_mask))
		goto err;
	return;
L
Linus Torvalds 已提交
5065

5066
sys_err:
5067 5068 5069
	qc->err_mask |= AC_ERR_SYSTEM;
err:
	ata_qc_complete(qc);
L
Linus Torvalds 已提交
5070 5071
}

5072 5073
/**
 *	sata_scr_valid - test whether SCRs are accessible
5074
 *	@link: ATA link to test SCR accessibility for
5075
 *
5076
 *	Test whether SCRs are accessible for @link.
5077 5078 5079 5080 5081 5082 5083
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
 *	1 if SCRs are accessible, 0 otherwise.
 */
5084
int sata_scr_valid(struct ata_link *link)
5085
{
5086 5087
	struct ata_port *ap = link->ap;

5088
	return (ap->flags & ATA_FLAG_SATA) && ap->ops->scr_read;
5089 5090 5091 5092
}

/**
 *	sata_scr_read - read SCR register of the specified port
5093
 *	@link: ATA link to read SCR for
5094 5095 5096
 *	@reg: SCR to read
 *	@val: Place to store read value
 *
5097
 *	Read SCR register @reg of @link into *@val.  This function is
5098 5099
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5100 5101
 *
 *	LOCKING:
5102
 *	None if @link is ap->link.  Kernel thread context otherwise.
5103 5104 5105 5106
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5107
int sata_scr_read(struct ata_link *link, int reg, u32 *val)
5108
{
5109 5110
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
5111
			return link->ap->ops->scr_read(link, reg, val);
5112 5113 5114 5115
		return -EOPNOTSUPP;
	}

	return sata_pmp_scr_read(link, reg, val);
5116 5117 5118 5119
}

/**
 *	sata_scr_write - write SCR register of the specified port
5120
 *	@link: ATA link to write SCR for
5121 5122 5123
 *	@reg: SCR to write
 *	@val: value to write
 *
5124
 *	Write @val to SCR register @reg of @link.  This function is
5125 5126
 *	guaranteed to succeed if @link is ap->link, the cable type of
 *	the port is SATA and the port implements ->scr_read.
5127 5128
 *
 *	LOCKING:
5129
 *	None if @link is ap->link.  Kernel thread context otherwise.
5130 5131 5132 5133
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5134
int sata_scr_write(struct ata_link *link, int reg, u32 val)
5135
{
5136 5137
	if (ata_is_host_link(link)) {
		if (sata_scr_valid(link))
5138
			return link->ap->ops->scr_write(link, reg, val);
5139 5140
		return -EOPNOTSUPP;
	}
5141

5142
	return sata_pmp_scr_write(link, reg, val);
5143 5144 5145 5146
}

/**
 *	sata_scr_write_flush - write SCR register of the specified port and flush
5147
 *	@link: ATA link to write SCR for
5148 5149 5150 5151 5152 5153 5154
 *	@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:
5155
 *	None if @link is ap->link.  Kernel thread context otherwise.
5156 5157 5158 5159
 *
 *	RETURNS:
 *	0 on success, negative errno on failure.
 */
5160
int sata_scr_write_flush(struct ata_link *link, int reg, u32 val)
5161
{
5162 5163
	if (ata_is_host_link(link)) {
		int rc;
5164

5165
		if (sata_scr_valid(link)) {
5166
			rc = link->ap->ops->scr_write(link, reg, val);
5167
			if (rc == 0)
5168
				rc = link->ap->ops->scr_read(link, reg, &val);
5169 5170 5171
			return rc;
		}
		return -EOPNOTSUPP;
5172
	}
5173 5174

	return sata_pmp_scr_write(link, reg, val);
5175 5176 5177
}

/**
T
Tejun Heo 已提交
5178
 *	ata_phys_link_online - test whether the given link is online
5179
 *	@link: ATA link to test
5180
 *
5181 5182 5183
 *	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).
5184 5185 5186 5187 5188
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5189
 *	True if the port online status is available and online.
5190
 */
T
Tejun Heo 已提交
5191
bool ata_phys_link_online(struct ata_link *link)
5192 5193 5194
{
	u32 sstatus;

5195
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5196
	    ata_sstatus_online(sstatus))
5197 5198
		return true;
	return false;
5199 5200 5201
}

/**
T
Tejun Heo 已提交
5202
 *	ata_phys_link_offline - test whether the given link is offline
5203
 *	@link: ATA link to test
5204
 *
5205 5206 5207
 *	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).
5208 5209 5210 5211 5212
 *
 *	LOCKING:
 *	None.
 *
 *	RETURNS:
5213
 *	True if the port offline status is available and offline.
5214
 */
T
Tejun Heo 已提交
5215
bool ata_phys_link_offline(struct ata_link *link)
5216 5217 5218
{
	u32 sstatus;

5219
	if (sata_scr_read(link, SCR_STATUS, &sstatus) == 0 &&
5220
	    !ata_sstatus_online(sstatus))
5221 5222
		return true;
	return false;
5223
}
5224

T
Tejun Heo 已提交
5225 5226 5227 5228 5229 5230 5231 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
/**
 *	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));
}

5277
#ifdef CONFIG_PM
5278 5279 5280
static void ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
				unsigned int action, unsigned int ehi_flags,
				bool async)
5281
{
5282
	struct ata_link *link;
5283 5284
	unsigned long flags;

5285 5286 5287 5288 5289 5290 5291
	/* Previous resume operation might still be in
	 * progress.  Wait for PM_PENDING to clear.
	 */
	if (ap->pflags & ATA_PFLAG_PM_PENDING) {
		ata_port_wait_eh(ap);
		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
	}
5292

5293 5294
	/* request PM ops to EH */
	spin_lock_irqsave(ap->lock, flags);
5295

5296 5297 5298 5299 5300 5301
	ap->pm_mesg = mesg;
	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;
	}
5302

5303
	ata_port_schedule_eh(ap);
5304

5305
	spin_unlock_irqrestore(ap->lock, flags);
5306

5307
	if (!async) {
5308 5309
		ata_port_wait_eh(ap);
		WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
5310 5311 5312
	}
}

5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324
/*
 * 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
 */
static const unsigned int ata_port_suspend_ehi = ATA_EHI_QUIET
						 | ATA_EHI_NO_AUTOPSY
						 | ATA_EHI_NO_RECOVERY;

static void ata_port_suspend(struct ata_port *ap, pm_message_t mesg)
5325
{
5326
	ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, false);
5327 5328
}

5329
static void ata_port_suspend_async(struct ata_port *ap, pm_message_t mesg)
5330
{
5331
	ata_port_request_pm(ap, mesg, 0, ata_port_suspend_ehi, true);
5332 5333
}

5334
static int ata_port_pm_suspend(struct device *dev)
5335
{
5336 5337
	struct ata_port *ap = to_ata_port(dev);

5338 5339 5340
	if (pm_runtime_suspended(dev))
		return 0;

5341 5342
	ata_port_suspend(ap, PMSG_SUSPEND);
	return 0;
5343 5344
}

5345
static int ata_port_pm_freeze(struct device *dev)
5346
{
5347 5348
	struct ata_port *ap = to_ata_port(dev);

5349
	if (pm_runtime_suspended(dev))
5350
		return 0;
5351

5352 5353
	ata_port_suspend(ap, PMSG_FREEZE);
	return 0;
5354 5355
}

5356
static int ata_port_pm_poweroff(struct device *dev)
5357
{
5358 5359
	ata_port_suspend(to_ata_port(dev), PMSG_HIBERNATE);
	return 0;
5360 5361
}

5362 5363
static const unsigned int ata_port_resume_ehi = ATA_EHI_NO_AUTOPSY
						| ATA_EHI_QUIET;
5364

5365 5366 5367
static void ata_port_resume(struct ata_port *ap, pm_message_t mesg)
{
	ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, false);
5368 5369
}

5370
static void ata_port_resume_async(struct ata_port *ap, pm_message_t mesg)
5371
{
5372
	ata_port_request_pm(ap, mesg, ATA_EH_RESET, ata_port_resume_ehi, true);
5373 5374
}

5375
static int ata_port_pm_resume(struct device *dev)
5376
{
T
Todd Brandt 已提交
5377
	ata_port_resume_async(to_ata_port(dev), PMSG_RESUME);
5378 5379 5380 5381
	pm_runtime_disable(dev);
	pm_runtime_set_active(dev);
	pm_runtime_enable(dev);
	return 0;
5382 5383
}

5384 5385 5386 5387 5388 5389 5390 5391
/*
 * For ODDs, the upper layer will poll for media change every few seconds,
 * which will make it enter and leave suspend state every few seconds. And
 * as each suspend will cause a hard/soft reset, the gain of runtime suspend
 * is very little and the ODD may malfunction after constantly being reset.
 * So the idle callback here will not proceed to suspend if a non-ZPODD capable
 * ODD is attached to the port.
 */
5392 5393
static int ata_port_runtime_idle(struct device *dev)
{
5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404
	struct ata_port *ap = to_ata_port(dev);
	struct ata_link *link;
	struct ata_device *adev;

	ata_for_each_link(link, ap, HOST_FIRST) {
		ata_for_each_dev(adev, link, ENABLED)
			if (adev->class == ATA_DEV_ATAPI &&
			    !zpodd_dev_enabled(adev))
				return -EBUSY;
	}

5405
	return 0;
5406 5407
}

5408 5409
static int ata_port_runtime_suspend(struct device *dev)
{
5410 5411
	ata_port_suspend(to_ata_port(dev), PMSG_AUTO_SUSPEND);
	return 0;
5412 5413 5414 5415
}

static int ata_port_runtime_resume(struct device *dev)
{
5416 5417
	ata_port_resume(to_ata_port(dev), PMSG_AUTO_RESUME);
	return 0;
5418 5419
}

5420
static const struct dev_pm_ops ata_port_pm_ops = {
5421 5422 5423 5424 5425 5426
	.suspend = ata_port_pm_suspend,
	.resume = ata_port_pm_resume,
	.freeze = ata_port_pm_freeze,
	.thaw = ata_port_pm_resume,
	.poweroff = ata_port_pm_poweroff,
	.restore = ata_port_pm_resume,
5427

5428 5429
	.runtime_suspend = ata_port_runtime_suspend,
	.runtime_resume = ata_port_runtime_resume,
5430
	.runtime_idle = ata_port_runtime_idle,
5431 5432
};

5433 5434 5435 5436 5437
/* 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.
 */
5438
void ata_sas_port_suspend(struct ata_port *ap)
5439
{
5440
	ata_port_suspend_async(ap, PMSG_SUSPEND);
5441
}
5442
EXPORT_SYMBOL_GPL(ata_sas_port_suspend);
5443

5444
void ata_sas_port_resume(struct ata_port *ap)
5445
{
5446
	ata_port_resume_async(ap, PMSG_RESUME);
5447
}
5448
EXPORT_SYMBOL_GPL(ata_sas_port_resume);
5449

5450
/**
J
Jeff Garzik 已提交
5451 5452
 *	ata_host_suspend - suspend host
 *	@host: host to suspend
5453 5454
 *	@mesg: PM message
 *
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
{
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
 *
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

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);
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 */
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 */
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;
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;

5572
	rc = sata_scr_read(link, SCR_CONTROL, &link->saved_scontrol);
5573 5574 5575
	if (rc)
		return rc;

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;
5612
	ap->local_port_no = -1;
J
Jeff Garzik 已提交
5613
	ap->host = host;
5614
	ap->dev = host->dev;
5615 5616 5617 5618 5619 5620

#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;
5621
#else
5622
	ap->msg_enable = ATA_MSG_DRV | ATA_MSG_ERR | ATA_MSG_WARN;
5623
#endif
L
Linus Torvalds 已提交
5624

5625
	mutex_init(&ap->scsi_scan_mutex);
5626 5627
	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
	INIT_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
5628
	INIT_LIST_HEAD(&ap->eh_done_q);
5629
	init_waitqueue_head(&ap->eh_wait_q);
5630
	init_completion(&ap->park_req_pending);
5631 5632 5633
	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
5634

5635 5636
	ap->cbl = ATA_CBL_NONE;

T
Tejun Heo 已提交
5637
	ata_link_init(ap, &ap->link, 0);
L
Linus Torvalds 已提交
5638 5639 5640 5641 5642

#ifdef ATA_IRQ_TRAP
	ap->stats.unhandled_irq = 1;
	ap->stats.idle_irq = 1;
#endif
5643 5644
	ata_sff_port_init(ap);

L
Linus Torvalds 已提交
5645 5646 5647
	return ap;
}

5648 5649 5650 5651 5652
static void ata_host_release(struct device *gendev, void *res)
{
	struct ata_host *host = dev_get_drvdata(gendev);
	int i;

5653 5654 5655
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5656 5657 5658 5659
		if (!ap)
			continue;

		if (ap->scsi_host)
5660 5661
			scsi_host_put(ap->scsi_host);

5662
		kfree(ap->pmp_link);
T
Tejun Heo 已提交
5663
		kfree(ap->slave_link);
5664
		kfree(ap);
5665 5666 5667
		host->ports[i] = NULL;
	}

5668
	dev_set_drvdata(gendev, NULL);
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 5712
/**
 *	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);
5713
	mutex_init(&host->eh_mutex);
5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733 5734 5735 5736
	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;
}

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 5774
/**
 *	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;
5775
		ap->link.flags |= pi->link_flags;
5776 5777 5778 5779 5780 5781 5782 5783 5784
		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
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 5846
/**
 *	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;
}

5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864
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);
}

5865 5866 5867 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 5879 5880 5881 5882 5883 5884 5885 5886
/**
 *	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)
{
5887
	static DEFINE_SPINLOCK(lock);
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 5914
	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);
}

5915 5916 5917 5918 5919 5920 5921
/**
 *	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
5922 5923
 *	once.  If host->ops isn't initialized yet, its set to the
 *	first non-dummy port ops.
5924 5925 5926 5927 5928 5929 5930 5931 5932
 *
 *	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)
{
5933 5934
	int have_stop = 0;
	void *start_dr = NULL;
5935 5936 5937 5938 5939
	int i, rc;

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

5940 5941
	ata_finalize_port_ops(host->ops);

5942 5943 5944
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

5945 5946
		ata_finalize_port_ops(ap->ops);

5947 5948 5949
		if (!host->ops && !ata_port_is_dummy(ap))
			host->ops = ap->ops;

5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965
		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];

5966 5967 5968
		if (ap->ops->port_start) {
			rc = ap->ops->port_start(ap);
			if (rc) {
5969
				if (rc != -ENODEV)
5970 5971 5972
					dev_err(host->dev,
						"failed to start port %d (errno=%d)\n",
						i, rc);
5973 5974 5975 5976 5977 5978
				goto err_out;
			}
		}
		ata_eh_freeze_port(ap);
	}

5979 5980
	if (start_dr)
		devres_add(host->dev, start_dr);
5981 5982 5983 5984 5985 5986 5987 5988 5989 5990
	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);
	}
5991
	devres_free(start_dr);
5992 5993 5994
	return rc;
}

5995
/**
5996
 *	ata_sas_host_init - Initialize a host struct for sas (ipr, libsas)
J
Jeff Garzik 已提交
5997 5998 5999
 *	@host:	host to initialize
 *	@dev:	device host is attached to
 *	@ops:	port_ops
6000 6001
 *
 */
J
Jeff Garzik 已提交
6002
void ata_host_init(struct ata_host *host, struct device *dev,
6003
		   struct ata_port_operations *ops)
6004
{
J
Jeff Garzik 已提交
6005
	spin_lock_init(&host->lock);
6006
	mutex_init(&host->eh_mutex);
6007
	host->n_tags = ATA_MAX_QUEUE - 1;
J
Jeff Garzik 已提交
6008 6009
	host->dev = dev;
	host->ops = ops;
6010 6011
}

6012
void __ata_port_probe(struct ata_port *ap)
6013
{
6014 6015
	struct ata_eh_info *ehi = &ap->link.eh_info;
	unsigned long flags;
6016

6017 6018
	/* kick EH for boot probing */
	spin_lock_irqsave(ap->lock, flags);
6019

6020 6021 6022
	ehi->probe_mask |= ATA_ALL_DEVICES;
	ehi->action |= ATA_EH_RESET;
	ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
6023

6024 6025 6026
	ap->pflags &= ~ATA_PFLAG_INITIALIZING;
	ap->pflags |= ATA_PFLAG_LOADING;
	ata_port_schedule_eh(ap);
6027

6028 6029
	spin_unlock_irqrestore(ap->lock, flags);
}
6030

6031 6032 6033
int ata_port_probe(struct ata_port *ap)
{
	int rc = 0;
6034

6035 6036
	if (ap->ops->error_handler) {
		__ata_port_probe(ap);
6037 6038 6039 6040 6041 6042
		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);
	}
6043 6044 6045 6046 6047 6048 6049
	return rc;
}


static void async_port_probe(void *data, async_cookie_t cookie)
{
	struct ata_port *ap = data;
6050

6051 6052 6053 6054 6055 6056 6057 6058 6059 6060 6061
	/*
	 * 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);
6062 6063 6064 6065 6066

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

	ata_scsi_scan_host(ap, 1);
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;

6089
	host->n_tags = clamp(sht->can_queue, 1, ATA_MAX_QUEUE - 1);
6090

6091 6092
	/* host must have been started */
	if (!(host->flags & ATA_HOST_STARTED)) {
6093
		dev_err(host->dev, "BUG: trying to register unstarted host\n");
6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105
		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]);

	/* give ports names and add SCSI hosts */
6106
	for (i = 0; i < host->n_ports; i++) {
6107
		host->ports[i]->print_id = atomic_inc_return(&ata_print_id);
6108 6109
		host->ports[i]->local_port_no = i + 1;
	}
6110

6111 6112 6113 6114 6115 6116 6117 6118
	/* 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;
		}
	}

6119 6120
	rc = ata_scsi_add_hosts(host, sht);
	if (rc)
6121
		goto err_tadd;
6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132

	/* 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 */
6133
		sata_link_init_spd(&ap->link);
T
Tejun Heo 已提交
6134 6135
		if (ap->slave_link)
			sata_link_init_spd(ap->slave_link);
6136

6137
		/* print per-port info to dmesg */
6138 6139 6140
		xfer_mask = ata_pack_xfermask(ap->pio_mask, ap->mwdma_mask,
					      ap->udma_mask);

6141
		if (!ata_port_is_dummy(ap)) {
6142 6143 6144 6145
			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);
6146 6147
			ata_ehi_clear_desc(&ap->link.eh_info);
		} else
6148
			ata_port_info(ap, "DUMMY\n");
6149 6150
	}

6151
	/* perform each probe asynchronously */
6152 6153
	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];
6154
		async_schedule(async_port_probe, ap);
6155 6156 6157
	}

	return 0;
6158 6159 6160 6161 6162 6163 6164

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

6165 6166
}

6167 6168 6169 6170 6171 6172 6173 6174 6175 6176 6177 6178 6179
/**
 *	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.
 *
6180 6181 6182 6183
 *	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.
 *
6184 6185 6186 6187 6188 6189 6190 6191 6192 6193
 *	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)
{
6194
	int i, rc;
6195 6196 6197 6198 6199

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

6200 6201 6202 6203 6204 6205
	/* Special case for polling mode */
	if (!irq) {
		WARN_ON(irq_handler);
		return ata_host_register(host, sht);
	}

6206
	rc = devm_request_irq(host->dev, irq, irq_handler, irq_flags,
6207
			      dev_name(host->dev), host);
6208 6209 6210
	if (rc)
		return rc;

6211 6212
	for (i = 0; i < host->n_ports; i++)
		ata_port_desc(host->ports[i], "irq %d", irq);
6213

6214 6215 6216 6217 6218 6219 6220 6221
	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;
}

6222 6223 6224 6225 6226 6227 6228 6229 6230 6231 6232
/**
 *	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).
 */
6233
static void ata_port_detach(struct ata_port *ap)
6234 6235
{
	unsigned long flags;
6236 6237
	struct ata_link *link;
	struct ata_device *dev;
6238 6239

	if (!ap->ops->error_handler)
6240
		goto skip_eh;
6241 6242

	/* tell EH we're leaving & flush EH */
6243
	spin_lock_irqsave(ap->lock, flags);
6244
	ap->pflags |= ATA_PFLAG_UNLOADING;
6245
	ata_port_schedule_eh(ap);
6246
	spin_unlock_irqrestore(ap->lock, flags);
6247

6248
	/* wait till EH commits suicide */
6249 6250
	ata_port_wait_eh(ap);

6251 6252
	/* it better be dead now */
	WARN_ON(!(ap->pflags & ATA_PFLAG_UNLOADED));
6253

6254
	cancel_delayed_work_sync(&ap->hotplug_task);
6255

6256
 skip_eh:
6257 6258 6259 6260 6261 6262 6263
	/* clean up zpodd on port removal */
	ata_for_each_link(link, ap, HOST_FIRST) {
		ata_for_each_dev(dev, link, ALL) {
			if (zpodd_dev_enabled(dev))
				zpodd_exit(dev);
		}
	}
6264 6265 6266 6267 6268
	if (ap->pmp_link) {
		int i;
		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
			ata_tlink_delete(&ap->pmp_link[i]);
	}
6269
	/* remove the associated SCSI host */
J
Jeff Garzik 已提交
6270
	scsi_remove_host(ap->scsi_host);
6271
	ata_tport_delete(ap);
6272 6273
}

6274 6275 6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288
/**
 *	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]);
6289 6290 6291

	/* the host is dead now, dissociate ACPI */
	ata_acpi_dissociate(host);
6292 6293
}

6294 6295
#ifdef CONFIG_PCI

L
Linus Torvalds 已提交
6296 6297 6298 6299
/**
 *	ata_pci_remove_one - PCI layer callback for device removal
 *	@pdev: PCI device that was removed
 *
6300 6301 6302
 *	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
6303 6304 6305 6306
 *
 *	LOCKING:
 *	Inherited from PCI layer (may sleep).
 */
6307
void ata_pci_remove_one(struct pci_dev *pdev)
L
Linus Torvalds 已提交
6308
{
6309
	struct ata_host *host = pci_get_drvdata(pdev);
L
Linus Torvalds 已提交
6310

6311
	ata_host_detach(host);
L
Linus Torvalds 已提交
6312 6313 6314
}

/* move to PCI subsystem */
6315
int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
L
Linus Torvalds 已提交
6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346
{
	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;
}
6347

6348
#ifdef CONFIG_PM
6349
void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg)
6350 6351
{
	pci_save_state(pdev);
6352
	pci_disable_device(pdev);
6353

6354
	if (mesg.event & PM_EVENT_SLEEP)
6355
		pci_set_power_state(pdev, PCI_D3hot);
6356 6357
}

6358
int ata_pci_device_do_resume(struct pci_dev *pdev)
6359
{
6360 6361
	int rc;

6362 6363
	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);
6364

6365
	rc = pcim_enable_device(pdev);
6366
	if (rc) {
6367 6368
		dev_err(&pdev->dev,
			"failed to enable device after resume (%d)\n", rc);
6369 6370 6371
		return rc;
	}

6372
	pci_set_master(pdev);
6373
	return 0;
6374 6375
}

6376
int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
6377
{
6378
	struct ata_host *host = pci_get_drvdata(pdev);
6379 6380
	int rc = 0;

J
Jeff Garzik 已提交
6381
	rc = ata_host_suspend(host, mesg);
6382 6383 6384
	if (rc)
		return rc;

6385
	ata_pci_device_do_suspend(pdev, mesg);
6386 6387 6388 6389 6390 6391

	return 0;
}

int ata_pci_device_resume(struct pci_dev *pdev)
{
6392
	struct ata_host *host = pci_get_drvdata(pdev);
6393
	int rc;
6394

6395 6396 6397 6398
	rc = ata_pci_device_do_resume(pdev);
	if (rc == 0)
		ata_host_resume(host);
	return rc;
6399
}
6400 6401
#endif /* CONFIG_PM */

L
Linus Torvalds 已提交
6402 6403
#endif /* CONFIG_PCI */

6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423
/**
 *	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;
}

6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440 6441 6442 6443
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 },
6444
		{ "dump_id",	.horkage_on	= ATA_HORKAGE_DUMP_ID },
6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458 6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478
		{ "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) },
6479 6480 6481
		{ "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
6482
		{ "rstonce",	.lflags		= ATA_LFLAG_RST_ONCE },
6483
		{ "atapi_dmadir", .horkage_on	= ATA_HORKAGE_ATAPI_DMADIR },
6484
		{ "disable",	.horkage_on	= ATA_HORKAGE_DISABLE },
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 6593 6594 6595 6596 6597 6598 6599 6600 6601 6602 6603 6604
	};
	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
6605 6606 6607

static int __init ata_init(void)
{
6608
	int rc;
6609

6610 6611
	ata_parse_force_param();

6612
	rc = ata_sff_init();
6613 6614 6615 6616
	if (rc) {
		kfree(ata_force_tbl);
		return rc;
	}
6617

6618 6619 6620 6621 6622 6623
	libata_transport_init();
	ata_scsi_transport_template = ata_attach_transport();
	if (!ata_scsi_transport_template) {
		ata_sff_exit();
		rc = -ENOMEM;
		goto err_out;
6624
	}
6625

L
Linus Torvalds 已提交
6626 6627
	printk(KERN_DEBUG "libata version " DRV_VERSION " loaded.\n");
	return 0;
6628 6629 6630

err_out:
	return rc;
L
Linus Torvalds 已提交
6631 6632 6633 6634
}

static void __exit ata_exit(void)
{
6635 6636
	ata_release_transport(ata_scsi_transport_template);
	libata_transport_exit();
6637
	ata_sff_exit();
6638
	kfree(ata_force_tbl);
L
Linus Torvalds 已提交
6639 6640
}

6641
subsys_initcall(ata_init);
L
Linus Torvalds 已提交
6642 6643
module_exit(ata_exit);

A
Akinobu Mita 已提交
6644
static DEFINE_RATELIMIT_STATE(ratelimit, HZ / 5, 1);
6645 6646 6647

int ata_ratelimit(void)
{
A
Akinobu Mita 已提交
6648
	return __ratelimit(&ratelimit);
6649 6650
}

6651 6652 6653 6654 6655 6656 6657 6658 6659 6660 6661 6662 6663 6664
/**
 *	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.
 */
6665 6666
void ata_msleep(struct ata_port *ap, unsigned int msecs)
{
6667 6668 6669 6670 6671
	bool owns_eh = ap && ap->host->eh_owner == current;

	if (owns_eh)
		ata_eh_release(ap);

6672
	msleep(msecs);
6673 6674 6675

	if (owns_eh)
		ata_eh_acquire(ap);
6676 6677
}

6678 6679
/**
 *	ata_wait_register - wait until register value changes
6680
 *	@ap: ATA port to wait register for, can be NULL
6681 6682 6683
 *	@reg: IO-mapped register
 *	@mask: Mask to apply to read register value
 *	@val: Wait condition
6684 6685
 *	@interval: polling interval in milliseconds
 *	@timeout: timeout in milliseconds
6686 6687 6688 6689 6690 6691 6692 6693 6694 6695 6696 6697 6698 6699 6700 6701
 *
 *	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.
 */
6702
u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
6703
		      unsigned long interval, unsigned long timeout)
6704
{
6705
	unsigned long deadline;
6706 6707 6708 6709 6710 6711 6712 6713
	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.
	 */
6714
	deadline = ata_deadline(jiffies, timeout);
6715

6716
	while ((tmp & mask) == val && time_before(jiffies, deadline)) {
6717
		ata_msleep(ap, interval);
6718 6719 6720 6721 6722 6723
		tmp = ioread32(reg);
	}

	return tmp;
}

6724 6725 6726
/*
 * Dummy port_ops
 */
6727
static unsigned int ata_dummy_qc_issue(struct ata_queued_cmd *qc)
6728
{
6729
	return AC_ERR_SYSTEM;
6730 6731
}

6732
static void ata_dummy_error_handler(struct ata_port *ap)
6733
{
6734
	/* truly dummy */
6735 6736
}

6737
struct ata_port_operations ata_dummy_port_ops = {
6738 6739
	.qc_prep		= ata_noop_qc_prep,
	.qc_issue		= ata_dummy_qc_issue,
6740
	.error_handler		= ata_dummy_error_handler,
6741 6742
	.sched_eh		= ata_std_sched_eh,
	.end_eh			= ata_std_end_eh,
6743 6744
};

6745 6746 6747 6748
const struct ata_port_info ata_dummy_port_info = {
	.port_ops		= &ata_dummy_port_ops,
};

6749 6750 6751
/*
 * Utility print functions
 */
6752 6753
void ata_port_printk(const struct ata_port *ap, const char *level,
		     const char *fmt, ...)
6754 6755 6756 6757 6758 6759 6760 6761 6762
{
	struct va_format vaf;
	va_list args;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

6763
	printk("%sata%u: %pV", level, ap->print_id, &vaf);
6764 6765 6766 6767 6768

	va_end(args);
}
EXPORT_SYMBOL(ata_port_printk);

6769 6770
void ata_link_printk(const struct ata_link *link, const char *level,
		     const char *fmt, ...)
6771 6772 6773 6774 6775 6776 6777 6778 6779 6780
{
	struct va_format vaf;
	va_list args;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

	if (sata_pmp_attached(link->ap) || link->ap->slave_link)
6781 6782
		printk("%sata%u.%02u: %pV",
		       level, link->ap->print_id, link->pmp, &vaf);
6783
	else
6784 6785
		printk("%sata%u: %pV",
		       level, link->ap->print_id, &vaf);
6786 6787 6788 6789 6790

	va_end(args);
}
EXPORT_SYMBOL(ata_link_printk);

6791
void ata_dev_printk(const struct ata_device *dev, const char *level,
6792 6793 6794 6795 6796 6797 6798 6799 6800 6801
		    const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	va_start(args, fmt);

	vaf.fmt = fmt;
	vaf.va = &args;

6802 6803 6804
	printk("%sata%u.%02u: %pV",
	       level, dev->link->ap->print_id, dev->link->pmp + dev->devno,
	       &vaf);
6805 6806 6807 6808 6809

	va_end(args);
}
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);
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);
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);
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);
6894 6895
EXPORT_SYMBOL_GPL(ata_timing_compute);
EXPORT_SYMBOL_GPL(ata_timing_merge);
6896
EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
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);
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 */
6908

6909 6910
EXPORT_SYMBOL_GPL(ata_platform_remove_one);

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);
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);
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