libata-scsi.c 88.7 KB
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/*
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 *  libata-scsi.c - helper library for ATA
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *    		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available from
 *  - http://www.t10.org/
 *  - http://www.t13.org/
 *
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 */

#include <linux/kernel.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_tcq.h>
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#include <scsi/scsi_transport.h>
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#include <linux/libata.h>
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#include <linux/hdreg.h>
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#include <asm/uaccess.h>

#include "libata.h"

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#define SECTOR_SIZE	512

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typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
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static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
					const struct scsi_device *scsidev);
static struct ata_device * ata_scsi_find_dev(struct ata_port *ap,
					    const struct scsi_device *scsidev);
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static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
			      unsigned int id, unsigned int lun);
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#define RW_RECOVERY_MPAGE 0x1
#define RW_RECOVERY_MPAGE_LEN 12
#define CACHE_MPAGE 0x8
#define CACHE_MPAGE_LEN 20
#define CONTROL_MPAGE 0xa
#define CONTROL_MPAGE_LEN 12
#define ALL_MPAGES 0x3f
#define ALL_SUB_MPAGES 0xff


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static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
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	RW_RECOVERY_MPAGE,
	RW_RECOVERY_MPAGE_LEN - 2,
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	(1 << 7),	/* AWRE */
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	0,		/* read retry count */
	0, 0, 0, 0,
	0,		/* write retry count */
	0, 0, 0
};

static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
	CACHE_MPAGE,
	CACHE_MPAGE_LEN - 2,
	0,		/* contains WCE, needs to be 0 for logic */
	0, 0, 0, 0, 0, 0, 0, 0, 0,
	0,		/* contains DRA, needs to be 0 for logic */
	0, 0, 0, 0, 0, 0, 0
};

static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
	CONTROL_MPAGE,
	CONTROL_MPAGE_LEN - 2,
	2,	/* DSENSE=0, GLTSD=1 */
	0,	/* [QAM+QERR may be 1, see 05-359r1] */
	0, 0, 0, 0, 0xff, 0xff,
	0, 30	/* extended self test time, see 05-359r1 */
};

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/*
 * libata transport template.  libata doesn't do real transport stuff.
 * It just needs the eh_timed_out hook.
 */
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static struct scsi_transport_template ata_scsi_transport_template = {
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	.eh_strategy_handler	= ata_scsi_error,
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	.eh_timed_out		= ata_scsi_timed_out,
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	.user_scan		= ata_scsi_user_scan,
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};

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static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
				   void (*done)(struct scsi_cmnd *))
{
	ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
	/* "Invalid field in cbd" */
	done(cmd);
}

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/**
 *	ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
 *	@sdev: SCSI device for which BIOS geometry is to be determined
 *	@bdev: block device associated with @sdev
 *	@capacity: capacity of SCSI device
 *	@geom: location to which geometry will be output
 *
 *	Generic bios head/sector/cylinder calculator
 *	used by sd. Most BIOSes nowadays expect a XXX/255/16  (CHS)
 *	mapping. Some situations may arise where the disk is not
 *	bootable if this is not used.
 *
 *	LOCKING:
 *	Defined by the SCSI layer.  We don't really care.
 *
 *	RETURNS:
 *	Zero.
 */
int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
		       sector_t capacity, int geom[])
{
	geom[0] = 255;
	geom[1] = 63;
	sector_div(capacity, 255*63);
	geom[2] = capacity;

	return 0;
}

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/**
 *	ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
 *	@sdev: SCSI device to get identify data for
 *	@arg: User buffer area for identify data
 *
 *	LOCKING:
 *	Defined by the SCSI layer.  We don't really care.
 *
 *	RETURNS:
 *	Zero on success, negative errno on error.
 */
static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
{
	struct ata_port *ap = ata_shost_to_port(sdev->host);
	struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
	u16 __user *dst = arg;
	char buf[40];

	if (!dev)
		return -ENOMSG;

	if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
		return -EFAULT;

	ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
	if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
		return -EFAULT;

	ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
	if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
		return -EFAULT;

	ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
	if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
		return -EFAULT;

	return 0;
}

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/**
 *	ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
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 *	@scsidev: Device to which we are issuing command
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 *	@arg: User provided data for issuing command
 *
 *	LOCKING:
 *	Defined by the SCSI layer.  We don't really care.
 *
 *	RETURNS:
 *	Zero on success, negative errno on error.
 */
int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
{
	int rc = 0;
	u8 scsi_cmd[MAX_COMMAND_SIZE];
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	u8 args[4], *argbuf = NULL, *sensebuf = NULL;
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	int argsize = 0;
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	enum dma_data_direction data_dir;
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	int cmd_result;
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	if (arg == NULL)
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		return -EINVAL;

	if (copy_from_user(args, arg, sizeof(args)))
		return -EFAULT;

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	sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
	if (!sensebuf)
		return -ENOMEM;

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	memset(scsi_cmd, 0, sizeof(scsi_cmd));

	if (args[3]) {
		argsize = SECTOR_SIZE * args[3];
		argbuf = kmalloc(argsize, GFP_KERNEL);
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		if (argbuf == NULL) {
			rc = -ENOMEM;
			goto error;
		}
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		scsi_cmd[1]  = (4 << 1); /* PIO Data-in */
		scsi_cmd[2]  = 0x0e;     /* no off.line or cc, read from dev,
		                            block count in sector count field */
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		data_dir = DMA_FROM_DEVICE;
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	} else {
		scsi_cmd[1]  = (3 << 1); /* Non-data */
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		scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
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		data_dir = DMA_NONE;
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	}

	scsi_cmd[0] = ATA_16;

	scsi_cmd[4] = args[2];
	if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
		scsi_cmd[6]  = args[3];
		scsi_cmd[8]  = args[1];
		scsi_cmd[10] = 0x4f;
		scsi_cmd[12] = 0xc2;
	} else {
		scsi_cmd[6]  = args[1];
	}
	scsi_cmd[14] = args[0];

	/* Good values for timeout and retries?  Values below
	   from scsi_ioctl_send_command() for default case... */
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	cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
	                          sensebuf, (10*HZ), 5, 0);

	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
		u8 *desc = sensebuf + 8;
		cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */

		/* If we set cc then ATA pass-through will cause a
		 * check condition even if no error. Filter that. */
		if (cmd_result & SAM_STAT_CHECK_CONDITION) {
			struct scsi_sense_hdr sshdr;
			scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
			                      &sshdr);
			if (sshdr.sense_key==0 &&
			    sshdr.asc==0 && sshdr.ascq==0)
				cmd_result &= ~SAM_STAT_CHECK_CONDITION;
		}

		/* Send userspace a few ATA registers (same as drivers/ide) */
		if (sensebuf[0] == 0x72 &&     /* format is "descriptor" */
		    desc[0] == 0x09 ) {        /* code is "ATA Descriptor" */
			args[0] = desc[13];    /* status */
			args[1] = desc[3];     /* error */
			args[2] = desc[5];     /* sector count (0:7) */
			if (copy_to_user(arg, args, sizeof(args)))
				rc = -EFAULT;
		}
	}


	if (cmd_result) {
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		rc = -EIO;
		goto error;
	}

	if ((argbuf)
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	 && copy_to_user(arg + sizeof(args), argbuf, argsize))
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		rc = -EFAULT;
error:
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	kfree(sensebuf);
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	kfree(argbuf);
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	return rc;
}

/**
 *	ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
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 *	@scsidev: Device to which we are issuing command
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 *	@arg: User provided data for issuing command
 *
 *	LOCKING:
 *	Defined by the SCSI layer.  We don't really care.
 *
 *	RETURNS:
 *	Zero on success, negative errno on error.
 */
int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
{
	int rc = 0;
	u8 scsi_cmd[MAX_COMMAND_SIZE];
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	u8 args[7], *sensebuf = NULL;
	int cmd_result;
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	if (arg == NULL)
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		return -EINVAL;

	if (copy_from_user(args, arg, sizeof(args)))
		return -EFAULT;

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	sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
	if (!sensebuf)
		return -ENOMEM;

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	memset(scsi_cmd, 0, sizeof(scsi_cmd));
	scsi_cmd[0]  = ATA_16;
	scsi_cmd[1]  = (3 << 1); /* Non-data */
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	scsi_cmd[2]  = 0x20;     /* cc but no off.line or data xfer */
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	scsi_cmd[4]  = args[1];
	scsi_cmd[6]  = args[2];
	scsi_cmd[8]  = args[3];
	scsi_cmd[10] = args[4];
	scsi_cmd[12] = args[5];
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	scsi_cmd[13] = args[6] & 0x4f;
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	scsi_cmd[14] = args[0];

	/* Good values for timeout and retries?  Values below
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	   from scsi_ioctl_send_command() for default case... */
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	cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
				sensebuf, (10*HZ), 5, 0);

	if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
		u8 *desc = sensebuf + 8;
		cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */

		/* If we set cc then ATA pass-through will cause a
		 * check condition even if no error. Filter that. */
		if (cmd_result & SAM_STAT_CHECK_CONDITION) {
			struct scsi_sense_hdr sshdr;
			scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
						&sshdr);
			if (sshdr.sense_key==0 &&
				sshdr.asc==0 && sshdr.ascq==0)
				cmd_result &= ~SAM_STAT_CHECK_CONDITION;
		}

		/* Send userspace ATA registers */
		if (sensebuf[0] == 0x72 &&	/* format is "descriptor" */
				desc[0] == 0x09) {/* code is "ATA Descriptor" */
			args[0] = desc[13];	/* status */
			args[1] = desc[3];	/* error */
			args[2] = desc[5];	/* sector count (0:7) */
			args[3] = desc[7];	/* lbal */
			args[4] = desc[9];	/* lbam */
			args[5] = desc[11];	/* lbah */
			args[6] = desc[12];	/* select */
			if (copy_to_user(arg, args, sizeof(args)))
				rc = -EFAULT;
		}
	}

	if (cmd_result) {
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		rc = -EIO;
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		goto error;
	}
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 error:
	kfree(sensebuf);
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	return rc;
}

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int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
{
	int val = -EINVAL, rc = -EINVAL;

	switch (cmd) {
	case ATA_IOC_GET_IO32:
		val = 0;
		if (copy_to_user(arg, &val, 1))
			return -EFAULT;
		return 0;

	case ATA_IOC_SET_IO32:
		val = (unsigned long) arg;
		if (val != 0)
			return -EINVAL;
		return 0;

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	case HDIO_GET_IDENTITY:
		return ata_get_identity(scsidev, arg);

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	case HDIO_DRIVE_CMD:
		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
			return -EACCES;
		return ata_cmd_ioctl(scsidev, arg);

	case HDIO_DRIVE_TASK:
		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
			return -EACCES;
		return ata_task_ioctl(scsidev, arg);

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	default:
		rc = -ENOTTY;
		break;
	}

	return rc;
}

/**
 *	ata_scsi_qc_new - acquire new ata_queued_cmd reference
 *	@dev: ATA device to which the new command is attached
 *	@cmd: SCSI command that originated this ATA command
 *	@done: SCSI command completion function
 *
 *	Obtain a reference to an unused ata_queued_cmd structure,
 *	which is the basic libata structure representing a single
 *	ATA command sent to the hardware.
 *
 *	If a command was available, fill in the SCSI-specific
 *	portions of the structure with information on the
 *	current command.
 *
 *	LOCKING:
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 *	spin_lock_irqsave(host lock)
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 *
 *	RETURNS:
 *	Command allocated, or %NULL if none available.
 */
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static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
					      struct scsi_cmnd *cmd,
					      void (*done)(struct scsi_cmnd *))
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{
	struct ata_queued_cmd *qc;

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	qc = ata_qc_new_init(dev);
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	if (qc) {
		qc->scsicmd = cmd;
		qc->scsidone = done;

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		qc->__sg = scsi_sglist(cmd);
		qc->n_elem = scsi_sg_count(cmd);
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	} else {
		cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
		done(cmd);
	}

	return qc;
}

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/**
 *	ata_dump_status - user friendly display of error info
 *	@id: id of the port in question
 *	@tf: ptr to filled out taskfile
 *
 *	Decode and dump the ATA error/status registers for the user so
 *	that they have some idea what really happened at the non
 *	make-believe layer.
 *
 *	LOCKING:
 *	inherited from caller
 */
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static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
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{
	u8 stat = tf->command, err = tf->feature;

	printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
	if (stat & ATA_BUSY) {
		printk("Busy }\n");	/* Data is not valid in this case */
	} else {
		if (stat & 0x40)	printk("DriveReady ");
		if (stat & 0x20)	printk("DeviceFault ");
		if (stat & 0x10)	printk("SeekComplete ");
		if (stat & 0x08)	printk("DataRequest ");
		if (stat & 0x04)	printk("CorrectedError ");
		if (stat & 0x02)	printk("Index ");
		if (stat & 0x01)	printk("Error ");
		printk("}\n");

		if (err) {
			printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
			if (err & 0x04)		printk("DriveStatusError ");
			if (err & 0x80) {
				if (err & 0x04)	printk("BadCRC ");
				else		printk("Sector ");
			}
			if (err & 0x40)		printk("UncorrectableError ");
			if (err & 0x10)		printk("SectorIdNotFound ");
			if (err & 0x02)		printk("TrackZeroNotFound ");
			if (err & 0x01)		printk("AddrMarkNotFound ");
			printk("}\n");
		}
	}
}

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/**
 *	ata_to_sense_error - convert ATA error to SCSI error
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 *	@id: ATA device number
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 *	@drv_stat: value contained in ATA status register
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 *	@drv_err: value contained in ATA error register
 *	@sk: the sense key we'll fill out
 *	@asc: the additional sense code we'll fill out
 *	@ascq: the additional sense code qualifier we'll fill out
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 *	@verbose: be verbose
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 *
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 *	Converts an ATA error into a SCSI error.  Fill out pointers to
 *	SK, ASC, and ASCQ bytes for later use in fixed or descriptor
 *	format sense blocks.
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 *
 *	LOCKING:
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 *	spin_lock_irqsave(host lock)
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 */
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static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
			       u8 *asc, u8 *ascq, int verbose)
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{
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	int i;
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	/* Based on the 3ware driver translation table */
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	static const unsigned char sense_table[][4] = {
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		/* BBD|ECC|ID|MAR */
		{0xd1, 		ABORTED_COMMAND, 0x00, 0x00}, 	// Device busy                  Aborted command
		/* BBD|ECC|ID */
		{0xd0,  	ABORTED_COMMAND, 0x00, 0x00}, 	// Device busy                  Aborted command
		/* ECC|MC|MARK */
		{0x61, 		HARDWARE_ERROR, 0x00, 0x00}, 	// Device fault                 Hardware error
		/* ICRC|ABRT */		/* NB: ICRC & !ABRT is BBD */
		{0x84, 		ABORTED_COMMAND, 0x47, 0x00}, 	// Data CRC error               SCSI parity error
		/* MC|ID|ABRT|TRK0|MARK */
		{0x37, 		NOT_READY, 0x04, 0x00}, 	// Unit offline                 Not ready
		/* MCR|MARK */
		{0x09, 		NOT_READY, 0x04, 0x00}, 	// Unrecovered disk error       Not ready
		/*  Bad address mark */
		{0x01, 		MEDIUM_ERROR, 0x13, 0x00}, 	// Address mark not found       Address mark not found for data field
		/* TRK0 */
		{0x02, 		HARDWARE_ERROR, 0x00, 0x00}, 	// Track 0 not found		  Hardware error
		/* Abort & !ICRC */
		{0x04, 		ABORTED_COMMAND, 0x00, 0x00}, 	// Aborted command              Aborted command
		/* Media change request */
		{0x08, 		NOT_READY, 0x04, 0x00}, 	// Media change request	  FIXME: faking offline
		/* SRV */
		{0x10, 		ABORTED_COMMAND, 0x14, 0x00}, 	// ID not found                 Recorded entity not found
		/* Media change */
		{0x08,  	NOT_READY, 0x04, 0x00}, 	// Media change		  FIXME: faking offline
		/* ECC */
		{0x40, 		MEDIUM_ERROR, 0x11, 0x04}, 	// Uncorrectable ECC error      Unrecovered read error
		/* BBD - block marked bad */
		{0x80, 		MEDIUM_ERROR, 0x11, 0x04}, 	// Block marked bad		  Medium error, unrecovered read error
		{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
	};
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	static const unsigned char stat_table[][4] = {
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562 563 564 565 566 567 568 569 570 571 572
		/* Must be first because BUSY means no other bits valid */
		{0x80, 		ABORTED_COMMAND, 0x47, 0x00},	// Busy, fake parity for now
		{0x20, 		HARDWARE_ERROR,  0x00, 0x00}, 	// Device fault
		{0x08, 		ABORTED_COMMAND, 0x47, 0x00},	// Timed out in xfer, fake parity for now
		{0x04, 		RECOVERED_ERROR, 0x11, 0x00},	// Recovered ECC error	  Medium error, recovered
		{0xFF, 0xFF, 0xFF, 0xFF}, // END mark
	};

	/*
	 *	Is this an error we can process/parse
	 */
573 574
	if (drv_stat & ATA_BUSY) {
		drv_err = 0;	/* Ignore the err bits, they're invalid */
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575
	}
576 577 578 579 580

	if (drv_err) {
		/* Look for drv_err */
		for (i = 0; sense_table[i][0] != 0xFF; i++) {
			/* Look for best matches first */
581
			if ((sense_table[i][0] & drv_err) ==
582 583 584 585 586 587 588 589
			    sense_table[i][0]) {
				*sk = sense_table[i][1];
				*asc = sense_table[i][2];
				*ascq = sense_table[i][3];
				goto translate_done;
			}
		}
		/* No immediate match */
590 591 592
		if (verbose)
			printk(KERN_WARNING "ata%u: no sense translation for "
			       "error 0x%02x\n", id, drv_err);
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	}
594 595 596 597 598 599 600 601

	/* Fall back to interpreting status bits */
	for (i = 0; stat_table[i][0] != 0xFF; i++) {
		if (stat_table[i][0] & drv_stat) {
			*sk = stat_table[i][1];
			*asc = stat_table[i][2];
			*ascq = stat_table[i][3];
			goto translate_done;
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602
		}
603 604
	}
	/* No error?  Undecoded? */
605 606 607
	if (verbose)
		printk(KERN_WARNING "ata%u: no sense translation for "
		       "status: 0x%02x\n", id, drv_stat);
608

609 610 611 612 613
	/* We need a sensible error return here, which is tricky, and one
	   that won't cause people to do things like return a disk wrongly */
	*sk = ABORTED_COMMAND;
	*asc = 0x00;
	*ascq = 0x00;
614 615

 translate_done:
616 617 618 619
	if (verbose)
		printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
		       "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
		       id, drv_stat, drv_err, *sk, *asc, *ascq);
620 621 622 623
	return;
}

/*
624
 *	ata_gen_passthru_sense - Generate check condition sense block.
625 626 627 628 629 630 631 632 633
 *	@qc: Command that completed.
 *
 *	This function is specific to the ATA descriptor format sense
 *	block specified for the ATA pass through commands.  Regardless
 *	of whether the command errored or not, return a sense
 *	block. Copy all controller registers into the sense
 *	block. Clear sense key, ASC & ASCQ if there is no error.
 *
 *	LOCKING:
634
 *	None.
635
 */
636
static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
637 638
{
	struct scsi_cmnd *cmd = qc->scsicmd;
639
	struct ata_taskfile *tf = &qc->result_tf;
640 641
	unsigned char *sb = cmd->sense_buffer;
	unsigned char *desc = sb + 8;
642
	int verbose = qc->ap->ops->error_handler == NULL;
643 644 645

	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);

646
	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
647 648 649 650 651

	/*
	 * Use ata_to_sense_error() to map status register bits
	 * onto sense key, asc & ascq.
	 */
652 653
	if (qc->err_mask ||
	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
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		ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
655
				   &sb[1], &sb[2], &sb[3], verbose);
656
		sb[1] &= 0x0f;
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657 658
	}

659 660 661 662
	/*
	 * Sense data is current and format is descriptor.
	 */
	sb[0] = 0x72;
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664 665
	desc[0] = 0x09;

666 667 668
	/* set length of additional sense data */
	sb[7] = 14;
	desc[1] = 12;
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691

	/*
	 * Copy registers into sense buffer.
	 */
	desc[2] = 0x00;
	desc[3] = tf->feature;	/* == error reg */
	desc[5] = tf->nsect;
	desc[7] = tf->lbal;
	desc[9] = tf->lbam;
	desc[11] = tf->lbah;
	desc[12] = tf->device;
	desc[13] = tf->command; /* == status reg */

	/*
	 * Fill in Extend bit, and the high order bytes
	 * if applicable.
	 */
	if (tf->flags & ATA_TFLAG_LBA48) {
		desc[2] |= 0x01;
		desc[4] = tf->hob_nsect;
		desc[6] = tf->hob_lbal;
		desc[8] = tf->hob_lbam;
		desc[10] = tf->hob_lbah;
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	}
693
}
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694

695
/**
696
 *	ata_gen_ata_sense - generate a SCSI fixed sense block
697 698
 *	@qc: Command that we are erroring out
 *
699 700
 *	Generate sense block for a failed ATA command @qc.  Descriptor
 *	format is used to accomodate LBA48 block address.
701 702
 *
 *	LOCKING:
703
 *	None.
704
 */
705
static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
706
{
707
	struct ata_device *dev = qc->dev;
708
	struct scsi_cmnd *cmd = qc->scsicmd;
709
	struct ata_taskfile *tf = &qc->result_tf;
710
	unsigned char *sb = cmd->sense_buffer;
711
	unsigned char *desc = sb + 8;
712
	int verbose = qc->ap->ops->error_handler == NULL;
713
	u64 block;
714 715 716

	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);

717
	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
718

719 720 721 722
	/* sense data is current and format is descriptor */
	sb[0] = 0x72;

	/* Use ata_to_sense_error() to map status register bits
723 724
	 * onto sense key, asc & ascq.
	 */
725 726
	if (qc->err_mask ||
	    tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
T
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727
		ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
728 729
				   &sb[1], &sb[2], &sb[3], verbose);
		sb[1] &= 0x0f;
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730 731
	}

732
	block = ata_tf_read_block(&qc->result_tf, dev);
733

734 735 736 737
	/* information sense data descriptor */
	sb[7] = 12;
	desc[0] = 0x00;
	desc[1] = 10;
738

739 740 741 742 743 744 745
	desc[2] |= 0x80;	/* valid */
	desc[6] = block >> 40;
	desc[7] = block >> 32;
	desc[8] = block >> 24;
	desc[9] = block >> 16;
	desc[10] = block >> 8;
	desc[11] = block;
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746 747
}

748 749 750 751
static void ata_scsi_sdev_config(struct scsi_device *sdev)
{
	sdev->use_10_for_rw = 1;
	sdev->use_10_for_ms = 1;
752 753 754 755 756 757 758

	/* Schedule policy is determined by ->qc_defer() callback and
	 * it needs to see every deferred qc.  Set dev_blocked to 1 to
	 * prevent SCSI midlayer from automatically deferring
	 * requests.
	 */
	sdev->max_device_blocked = 1;
759 760 761 762 763
}

static void ata_scsi_dev_config(struct scsi_device *sdev,
				struct ata_device *dev)
{
764 765
	/* configure max sectors */
	blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
766

767
	/* SATA DMA transfers must be multiples of 4 byte, so
768 769 770 771
	 * we need to pad ATAPI transfers using an extra sg.
	 * Decrement max hw segments accordingly.
	 */
	if (dev->class == ATA_DEV_ATAPI) {
772
		struct request_queue *q = sdev->request_queue;
773 774
		blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
	}
775 776 777 778 779 780 781 782

	if (dev->flags & ATA_DFLAG_NCQ) {
		int depth;

		depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
		depth = min(ATA_MAX_QUEUE - 1, depth);
		scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
	}
783 784
}

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785 786 787 788 789 790 791 792 793 794 795 796 797 798
/**
 *	ata_scsi_slave_config - Set SCSI device attributes
 *	@sdev: SCSI device to examine
 *
 *	This is called before we actually start reading
 *	and writing to the device, to configure certain
 *	SCSI mid-layer behaviors.
 *
 *	LOCKING:
 *	Defined by SCSI layer.  We don't really care.
 */

int ata_scsi_slave_config(struct scsi_device *sdev)
{
799 800 801
	struct ata_port *ap = ata_shost_to_port(sdev->host);
	struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);

802
	ata_scsi_sdev_config(sdev);
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803

804 805
	sdev->manage_start_stop = 1;

806
	if (dev)
807
		ata_scsi_dev_config(sdev, dev);
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808 809 810 811

	return 0;	/* scsi layer doesn't check return value, sigh */
}

812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834
/**
 *	ata_scsi_slave_destroy - SCSI device is about to be destroyed
 *	@sdev: SCSI device to be destroyed
 *
 *	@sdev is about to be destroyed for hot/warm unplugging.  If
 *	this unplugging was initiated by libata as indicated by NULL
 *	dev->sdev, this function doesn't have to do anything.
 *	Otherwise, SCSI layer initiated warm-unplug is in progress.
 *	Clear dev->sdev, schedule the device for ATA detach and invoke
 *	EH.
 *
 *	LOCKING:
 *	Defined by SCSI layer.  We don't really care.
 */
void ata_scsi_slave_destroy(struct scsi_device *sdev)
{
	struct ata_port *ap = ata_shost_to_port(sdev->host);
	unsigned long flags;
	struct ata_device *dev;

	if (!ap->ops->error_handler)
		return;

835
	spin_lock_irqsave(ap->lock, flags);
836 837 838 839 840 841 842
	dev = __ata_scsi_find_dev(ap, sdev);
	if (dev && dev->sdev) {
		/* SCSI device already in CANCEL state, no need to offline it */
		dev->sdev = NULL;
		dev->flags |= ATA_DFLAG_DETACH;
		ata_port_schedule_eh(ap);
	}
843
	spin_unlock_irqrestore(ap->lock, flags);
844 845
}

846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864
/**
 *	ata_scsi_change_queue_depth - SCSI callback for queue depth config
 *	@sdev: SCSI device to configure queue depth for
 *	@queue_depth: new queue depth
 *
 *	This is libata standard hostt->change_queue_depth callback.
 *	SCSI will call into this callback when user tries to set queue
 *	depth via sysfs.
 *
 *	LOCKING:
 *	SCSI layer (we don't care)
 *
 *	RETURNS:
 *	Newly configured queue depth.
 */
int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
{
	struct ata_port *ap = ata_shost_to_port(sdev->host);
	struct ata_device *dev;
865
	unsigned long flags;
866

867
	if (queue_depth < 1 || queue_depth == sdev->queue_depth)
868 869 870 871 872 873
		return sdev->queue_depth;

	dev = ata_scsi_find_dev(ap, sdev);
	if (!dev || !ata_dev_enabled(dev))
		return sdev->queue_depth;

874
	/* NCQ enabled? */
875
	spin_lock_irqsave(ap->lock, flags);
876 877
	dev->flags &= ~ATA_DFLAG_NCQ_OFF;
	if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
878
		dev->flags |= ATA_DFLAG_NCQ_OFF;
879 880
		queue_depth = 1;
	}
881 882
	spin_unlock_irqrestore(ap->lock, flags);

883 884 885 886 887 888 889 890 891
	/* limit and apply queue depth */
	queue_depth = min(queue_depth, sdev->host->can_queue);
	queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
	queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);

	if (sdev->queue_depth == queue_depth)
		return -EINVAL;

	scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
892 893 894
	return queue_depth;
}

895
/* XXX: for spindown warning */
896 897 898 899 900 901 902
static void ata_delayed_done_timerfn(unsigned long arg)
{
	struct scsi_cmnd *scmd = (void *)arg;

	scmd->scsi_done(scmd);
}

903
/* XXX: for spindown warning */
904 905 906 907 908 909 910 911
static void ata_delayed_done(struct scsi_cmnd *scmd)
{
	static struct timer_list timer;

	setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd);
	mod_timer(&timer, jiffies + 5 * HZ);
}

912 913 914 915 916 917 918 919 920 921
/**
 *	ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
 *	@qc: Storage for translated ATA taskfile
 *
 *	Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
 *	(to start). Perhaps these commands should be preceded by
 *	CHECK POWER MODE to see what power mode the device is already in.
 *	[See SAT revision 5 at www.t10.org]
 *
 *	LOCKING:
J
Jeff Garzik 已提交
922
 *	spin_lock_irqsave(host lock)
923 924 925 926
 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */
927
static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
928
{
929
	struct scsi_cmnd *scmd = qc->scsicmd;
930
	struct ata_taskfile *tf = &qc->tf;
931
	const u8 *cdb = scmd->cmnd;
932

933 934 935
	if (scmd->cmd_len < 5)
		goto invalid_fld;

936 937
	tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
	tf->protocol = ATA_PROT_NODATA;
938
	if (cdb[1] & 0x1) {
939 940
		;	/* ignore IMMED bit, violates sat-r05 */
	}
941
	if (cdb[4] & 0x2)
942
		goto invalid_fld;       /* LOEJ bit set not supported */
943
	if (((cdb[4] >> 4) & 0xf) != 0)
944
		goto invalid_fld;       /* power conditions not supported */
945 946 947 948 949 950 951

	if (qc->dev->horkage & ATA_HORKAGE_SKIP_PM) {
		/* the device lacks PM support, finish without doing anything */
		scmd->result = SAM_STAT_GOOD;
		return 1;
	}

952
	if (cdb[4] & 0x1) {
953
		tf->nsect = 1;	/* 1 sector, lba=0 */
954 955

		if (qc->dev->flags & ATA_DFLAG_LBA) {
956
			tf->flags |= ATA_TFLAG_LBA;
957 958 959 960 961 962 963 964 965 966 967 968

			tf->lbah = 0x0;
			tf->lbam = 0x0;
			tf->lbal = 0x0;
			tf->device |= ATA_LBA;
		} else {
			/* CHS */
			tf->lbal = 0x1; /* sect */
			tf->lbam = 0x0; /* cyl low */
			tf->lbah = 0x0; /* cyl high */
		}

969
		tf->command = ATA_CMD_VERIFY;	/* READ VERIFY */
970 971 972 973 974
	} else {
		/* XXX: This is for backward compatibility, will be
		 * removed.  Read Documentation/feature-removal-schedule.txt
		 * for more info.
		 */
975
		if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) &&
976 977
		    (system_state == SYSTEM_HALT ||
		     system_state == SYSTEM_POWER_OFF)) {
978
			static unsigned long warned = 0;
979

980
			if (!test_and_set_bit(0, &warned)) {
981 982 983 984 985 986
				ata_dev_printk(qc->dev, KERN_WARNING,
					"DISK MIGHT NOT BE SPUN DOWN PROPERLY. "
					"UPDATE SHUTDOWN UTILITY\n");
				ata_dev_printk(qc->dev, KERN_WARNING,
					"For more info, visit "
					"http://linux-ata.org/shutdown.html\n");
987 988 989 990 991 992

				/* ->scsi_done is not used, use it for
				 * delayed completion.
				 */
				scmd->scsi_done = qc->scsidone;
				qc->scsidone = ata_delayed_done;
993 994 995 996 997
			}
			scmd->result = SAM_STAT_GOOD;
			return 1;
		}

998 999
		/* Issue ATA STANDBY IMMEDIATE command */
		tf->command = ATA_CMD_STANDBYNOW1;
1000
	}
1001

1002 1003 1004 1005 1006 1007 1008 1009
	/*
	 * Standby and Idle condition timers could be implemented but that
	 * would require libata to implement the Power condition mode page
	 * and allow the user to change it. Changing mode pages requires
	 * MODE SELECT to be implemented.
	 */

	return 0;
1010 1011

invalid_fld:
1012
	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1013 1014
	/* "Invalid field in cbd" */
	return 1;
1015 1016 1017
}


L
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1018 1019 1020 1021 1022 1023 1024 1025
/**
 *	ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
 *	@qc: Storage for translated ATA taskfile
 *
 *	Sets up an ATA taskfile to issue FLUSH CACHE or
 *	FLUSH CACHE EXT.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1026
 *	spin_lock_irqsave(host lock)
L
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1027 1028 1029 1030
 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */
1031
static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
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1032 1033 1034 1035 1036 1037
{
	struct ata_taskfile *tf = &qc->tf;

	tf->flags |= ATA_TFLAG_DEVICE;
	tf->protocol = ATA_PROT_NODATA;

1038
	if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
L
Linus Torvalds 已提交
1039 1040 1041 1042 1043 1044 1045
		tf->command = ATA_CMD_FLUSH_EXT;
	else
		tf->command = ATA_CMD_FLUSH;

	return 0;
}

1046 1047
/**
 *	scsi_6_lba_len - Get LBA and transfer length
1048
 *	@cdb: SCSI command to translate
1049 1050 1051 1052 1053 1054 1055
 *
 *	Calculate LBA and transfer length for 6-byte commands.
 *
 *	RETURNS:
 *	@plba: the LBA
 *	@plen: the transfer length
 */
1056
static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1057 1058
{
	u64 lba = 0;
1059
	u32 len;
1060 1061 1062

	VPRINTK("six-byte command\n");

1063
	lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1064 1065
	lba |= ((u64)cdb[2]) << 8;
	lba |= ((u64)cdb[3]);
1066

1067
	len = cdb[4];
1068 1069 1070 1071 1072 1073 1074

	*plba = lba;
	*plen = len;
}

/**
 *	scsi_10_lba_len - Get LBA and transfer length
1075
 *	@cdb: SCSI command to translate
1076 1077 1078 1079 1080 1081 1082
 *
 *	Calculate LBA and transfer length for 10-byte commands.
 *
 *	RETURNS:
 *	@plba: the LBA
 *	@plen: the transfer length
 */
1083
static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1084 1085 1086 1087 1088 1089
{
	u64 lba = 0;
	u32 len = 0;

	VPRINTK("ten-byte command\n");

1090 1091 1092 1093
	lba |= ((u64)cdb[2]) << 24;
	lba |= ((u64)cdb[3]) << 16;
	lba |= ((u64)cdb[4]) << 8;
	lba |= ((u64)cdb[5]);
1094

1095 1096
	len |= ((u32)cdb[7]) << 8;
	len |= ((u32)cdb[8]);
1097 1098 1099 1100 1101 1102 1103

	*plba = lba;
	*plen = len;
}

/**
 *	scsi_16_lba_len - Get LBA and transfer length
1104
 *	@cdb: SCSI command to translate
1105 1106 1107 1108 1109 1110 1111
 *
 *	Calculate LBA and transfer length for 16-byte commands.
 *
 *	RETURNS:
 *	@plba: the LBA
 *	@plen: the transfer length
 */
1112
static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1113 1114 1115 1116 1117 1118
{
	u64 lba = 0;
	u32 len = 0;

	VPRINTK("sixteen-byte command\n");

1119 1120 1121 1122 1123 1124 1125 1126
	lba |= ((u64)cdb[2]) << 56;
	lba |= ((u64)cdb[3]) << 48;
	lba |= ((u64)cdb[4]) << 40;
	lba |= ((u64)cdb[5]) << 32;
	lba |= ((u64)cdb[6]) << 24;
	lba |= ((u64)cdb[7]) << 16;
	lba |= ((u64)cdb[8]) << 8;
	lba |= ((u64)cdb[9]);
1127

1128 1129 1130 1131
	len |= ((u32)cdb[10]) << 24;
	len |= ((u32)cdb[11]) << 16;
	len |= ((u32)cdb[12]) << 8;
	len |= ((u32)cdb[13]);
1132 1133 1134 1135 1136

	*plba = lba;
	*plen = len;
}

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Linus Torvalds 已提交
1137 1138 1139 1140 1141 1142 1143
/**
 *	ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
 *	@qc: Storage for translated ATA taskfile
 *
 *	Converts SCSI VERIFY command to an ATA READ VERIFY command.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1144
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
1145 1146 1147 1148
 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */
1149
static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
1150
{
1151
	struct scsi_cmnd *scmd = qc->scsicmd;
L
Linus Torvalds 已提交
1152
	struct ata_taskfile *tf = &qc->tf;
1153
	struct ata_device *dev = qc->dev;
L
Linus Torvalds 已提交
1154
	u64 dev_sectors = qc->dev->n_sectors;
1155
	const u8 *cdb = scmd->cmnd;
1156 1157
	u64 block;
	u32 n_block;
L
Linus Torvalds 已提交
1158 1159 1160 1161

	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf->protocol = ATA_PROT_NODATA;

1162 1163 1164
	if (cdb[0] == VERIFY) {
		if (scmd->cmd_len < 10)
			goto invalid_fld;
1165
		scsi_10_lba_len(cdb, &block, &n_block);
1166 1167 1168
	} else if (cdb[0] == VERIFY_16) {
		if (scmd->cmd_len < 16)
			goto invalid_fld;
1169
		scsi_16_lba_len(cdb, &block, &n_block);
1170
	} else
1171
		goto invalid_fld;
L
Linus Torvalds 已提交
1172

1173
	if (!n_block)
1174
		goto nothing_to_do;
1175
	if (block >= dev_sectors)
1176
		goto out_of_range;
1177
	if ((block + n_block) > dev_sectors)
1178
		goto out_of_range;
L
Linus Torvalds 已提交
1179

1180 1181 1182
	if (dev->flags & ATA_DFLAG_LBA) {
		tf->flags |= ATA_TFLAG_LBA;

1183 1184 1185 1186 1187 1188 1189
		if (lba_28_ok(block, n_block)) {
			/* use LBA28 */
			tf->command = ATA_CMD_VERIFY;
			tf->device |= (block >> 24) & 0xf;
		} else if (lba_48_ok(block, n_block)) {
			if (!(dev->flags & ATA_DFLAG_LBA48))
				goto out_of_range;
1190 1191 1192

			/* use LBA48 */
			tf->flags |= ATA_TFLAG_LBA48;
1193
			tf->command = ATA_CMD_VERIFY_EXT;
L
Linus Torvalds 已提交
1194

1195
			tf->hob_nsect = (n_block >> 8) & 0xff;
L
Linus Torvalds 已提交
1196

1197 1198 1199
			tf->hob_lbah = (block >> 40) & 0xff;
			tf->hob_lbam = (block >> 32) & 0xff;
			tf->hob_lbal = (block >> 24) & 0xff;
1200 1201 1202
		} else
			/* request too large even for LBA48 */
			goto out_of_range;
1203 1204

		tf->nsect = n_block & 0xff;
L
Linus Torvalds 已提交
1205

1206 1207 1208
		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;
L
Linus Torvalds 已提交
1209

1210 1211 1212 1213 1214
		tf->device |= ATA_LBA;
	} else {
		/* CHS */
		u32 sect, head, cyl, track;

1215 1216
		if (!lba_28_ok(block, n_block))
			goto out_of_range;
1217

1218 1219 1220 1221 1222 1223
		/* Convert LBA to CHS */
		track = (u32)block / dev->sectors;
		cyl   = track / dev->heads;
		head  = track % dev->heads;
		sect  = (u32)block % dev->sectors + 1;

1224 1225
		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
			(u32)block, track, cyl, head, sect);
1226 1227 1228

		/* Check whether the converted CHS can fit.
		   Cylinder: 0-65535
1229 1230
		   Head: 0-15
		   Sector: 1-255*/
1231
		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1232
			goto out_of_range;
1233

1234 1235 1236 1237 1238 1239 1240
		tf->command = ATA_CMD_VERIFY;
		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
		tf->lbal = sect;
		tf->lbam = cyl;
		tf->lbah = cyl >> 8;
		tf->device |= head;
	}
L
Linus Torvalds 已提交
1241 1242

	return 0;
1243 1244

invalid_fld:
1245
	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1246 1247 1248 1249
	/* "Invalid field in cbd" */
	return 1;

out_of_range:
1250
	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1251 1252 1253 1254
	/* "Logical Block Address out of range" */
	return 1;

nothing_to_do:
1255
	scmd->result = SAM_STAT_GOOD;
1256
	return 1;
L
Linus Torvalds 已提交
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
}

/**
 *	ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
 *	@qc: Storage for translated ATA taskfile
 *
 *	Converts any of six SCSI read/write commands into the
 *	ATA counterpart, including starting sector (LBA),
 *	sector count, and taking into account the device's LBA48
 *	support.
 *
 *	Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
 *	%WRITE_16 are currently supported.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1272
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
1273 1274 1275 1276
 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */
1277
static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
1278
{
1279
	struct scsi_cmnd *scmd = qc->scsicmd;
1280
	const u8 *cdb = scmd->cmnd;
1281
	unsigned int tf_flags = 0;
1282 1283
	u64 block;
	u32 n_block;
1284
	int rc;
L
Linus Torvalds 已提交
1285

1286
	if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1287
		tf_flags |= ATA_TFLAG_WRITE;
L
Linus Torvalds 已提交
1288

T
Tejun Heo 已提交
1289
	/* Calculate the SCSI LBA, transfer length and FUA. */
1290
	switch (cdb[0]) {
1291 1292
	case READ_10:
	case WRITE_10:
1293 1294
		if (unlikely(scmd->cmd_len < 10))
			goto invalid_fld;
1295 1296
		scsi_10_lba_len(cdb, &block, &n_block);
		if (unlikely(cdb[1] & (1 << 3)))
1297
			tf_flags |= ATA_TFLAG_FUA;
1298 1299 1300
		break;
	case READ_6:
	case WRITE_6:
1301 1302
		if (unlikely(scmd->cmd_len < 6))
			goto invalid_fld;
1303
		scsi_6_lba_len(cdb, &block, &n_block);
1304 1305 1306 1307

		/* for 6-byte r/w commands, transfer length 0
		 * means 256 blocks of data, not 0 block.
		 */
1308 1309
		if (!n_block)
			n_block = 256;
1310 1311 1312
		break;
	case READ_16:
	case WRITE_16:
1313 1314
		if (unlikely(scmd->cmd_len < 16))
			goto invalid_fld;
1315 1316
		scsi_16_lba_len(cdb, &block, &n_block);
		if (unlikely(cdb[1] & (1 << 3)))
1317
			tf_flags |= ATA_TFLAG_FUA;
1318 1319
		break;
	default:
1320
		DPRINTK("no-byte command\n");
1321
		goto invalid_fld;
L
Linus Torvalds 已提交
1322 1323
	}

1324 1325
	/* Check and compose ATA command */
	if (!n_block)
1326 1327 1328 1329
		/* For 10-byte and 16-byte SCSI R/W commands, transfer
		 * length 0 means transfer 0 block of data.
		 * However, for ATA R/W commands, sector count 0 means
		 * 256 or 65536 sectors, not 0 sectors as in SCSI.
A
Alan Cox 已提交
1330 1331
		 *
		 * WARNING: one or two older ATA drives treat 0 as 0...
1332
		 */
1333
		goto nothing_to_do;
L
Linus Torvalds 已提交
1334

1335
	qc->flags |= ATA_QCFLAG_IO;
T
Tejun Heo 已提交
1336
	qc->nbytes = n_block * ATA_SECT_SIZE;
L
Linus Torvalds 已提交
1337

1338 1339 1340 1341
	rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
			     qc->tag);
	if (likely(rc == 0))
		return 0;
1342

1343 1344 1345
	if (rc == -ERANGE)
		goto out_of_range;
	/* treat all other errors as -EINVAL, fall through */
1346
invalid_fld:
1347
	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1348 1349 1350 1351
	/* "Invalid field in cbd" */
	return 1;

out_of_range:
1352
	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1353 1354 1355 1356
	/* "Logical Block Address out of range" */
	return 1;

nothing_to_do:
1357
	scmd->result = SAM_STAT_GOOD;
1358
	return 1;
L
Linus Torvalds 已提交
1359 1360
}

1361
static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
1362
{
1363
	struct ata_port *ap = qc->ap;
1364
	struct ata_eh_info *ehi = &qc->dev->link->eh_info;
L
Linus Torvalds 已提交
1365
	struct scsi_cmnd *cmd = qc->scsicmd;
1366
	u8 *cdb = cmd->cmnd;
1367
 	int need_sense = (qc->err_mask != 0);
1368

1369 1370 1371 1372
	/* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
	 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
	 * cache
	 */
1373 1374 1375 1376 1377
	if (ap->ops->error_handler && !need_sense) {
		switch (qc->tf.command) {
		case ATA_CMD_SET_FEATURES:
			if ((qc->tf.feature == SETFEATURES_WC_ON) ||
			    (qc->tf.feature == SETFEATURES_WC_OFF)) {
1378
				ehi->action |= ATA_EH_REVALIDATE;
1379 1380 1381 1382 1383 1384
				ata_port_schedule_eh(ap);
			}
			break;

		case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
		case ATA_CMD_SET_MULTI: /* multi_count changed */
1385
			ehi->action |= ATA_EH_REVALIDATE;
1386 1387 1388
			ata_port_schedule_eh(ap);
			break;
		}
1389 1390
	}

1391 1392 1393 1394 1395 1396 1397
	/* For ATA pass thru (SAT) commands, generate a sense block if
	 * user mandated it or if there's an error.  Note that if we
	 * generate because the user forced us to, a check condition
	 * is generated and the ATA register values are returned
	 * whether the command completed successfully or not. If there
	 * was no error, SK, ASC and ASCQ will all be zero.
	 */
1398 1399
	if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
 	    ((cdb[2] & 0x20) || need_sense)) {
1400
		ata_gen_passthru_sense(qc);
1401 1402 1403 1404 1405 1406 1407 1408 1409 1410
	} else {
		if (!need_sense) {
			cmd->result = SAM_STAT_GOOD;
		} else {
			/* TODO: decide which descriptor format to use
			 * for 48b LBA devices and call that here
			 * instead of the fixed desc, which is only
			 * good for smaller LBA (and maybe CHS?)
			 * devices.
			 */
1411
			ata_gen_ata_sense(qc);
1412 1413
		}
	}
L
Linus Torvalds 已提交
1414

1415
	/* XXX: track spindown state for spindown skipping and warning */
1416 1417 1418 1419 1420 1421 1422
	if (unlikely(qc->tf.command == ATA_CMD_STANDBY ||
		     qc->tf.command == ATA_CMD_STANDBYNOW1))
		qc->dev->flags |= ATA_DFLAG_SPUNDOWN;
	else if (likely(system_state != SYSTEM_HALT &&
			system_state != SYSTEM_POWER_OFF))
		qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN;

1423
	if (need_sense && !ap->ops->error_handler)
T
Tejun Heo 已提交
1424
		ata_dump_status(ap->print_id, &qc->result_tf);
L
Linus Torvalds 已提交
1425 1426 1427

	qc->scsidone(cmd);

1428
	ata_qc_free(qc);
L
Linus Torvalds 已提交
1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
}

/**
 *	ata_scsi_translate - Translate then issue SCSI command to ATA device
 *	@dev: ATA device to which the command is addressed
 *	@cmd: SCSI command to execute
 *	@done: SCSI command completion function
 *	@xlat_func: Actor which translates @cmd to an ATA taskfile
 *
 *	Our ->queuecommand() function has decided that the SCSI
 *	command issued can be directly translated into an ATA
 *	command, rather than handled internally.
 *
 *	This function sets up an ata_queued_cmd structure for the
 *	SCSI command, and sends that ata_queued_cmd to the hardware.
 *
1445 1446 1447 1448 1449 1450
 *	The xlat_func argument (actor) returns 0 if ready to execute
 *	ATA command, else 1 to finish translation. If 1 is returned
 *	then cmd->result (and possibly cmd->sense_buffer) are assumed
 *	to be set reflecting an error condition or clean (early)
 *	termination.
 *
L
Linus Torvalds 已提交
1451
 *	LOCKING:
J
Jeff Garzik 已提交
1452
 *	spin_lock_irqsave(host lock)
1453 1454 1455 1456
 *
 *	RETURNS:
 *	0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
 *	needs to be deferred.
L
Linus Torvalds 已提交
1457
 */
1458 1459 1460
static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
			      void (*done)(struct scsi_cmnd *),
			      ata_xlat_func_t xlat_func)
L
Linus Torvalds 已提交
1461
{
1462
	struct ata_port *ap = dev->link->ap;
L
Linus Torvalds 已提交
1463
	struct ata_queued_cmd *qc;
1464
	int rc;
L
Linus Torvalds 已提交
1465 1466 1467

	VPRINTK("ENTER\n");

T
Tejun Heo 已提交
1468
	qc = ata_scsi_qc_new(dev, cmd, done);
L
Linus Torvalds 已提交
1469
	if (!qc)
1470
		goto err_mem;
L
Linus Torvalds 已提交
1471 1472

	/* data is present; dma-map it */
1473 1474
	if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
	    cmd->sc_data_direction == DMA_TO_DEVICE) {
1475
		if (unlikely(scsi_bufflen(cmd) < 1)) {
1476 1477
			ata_dev_printk(dev, KERN_WARNING,
				       "WARNING: zero len r/w req\n");
1478
			goto err_did;
L
Linus Torvalds 已提交
1479 1480
		}

1481
		ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
L
Linus Torvalds 已提交
1482 1483 1484 1485 1486 1487

		qc->dma_dir = cmd->sc_data_direction;
	}

	qc->complete_fn = ata_scsi_qc_complete;

1488
	if (xlat_func(qc))
1489
		goto early_finish;
L
Linus Torvalds 已提交
1490

1491 1492 1493 1494 1495
	if (ap->ops->qc_defer) {
		if ((rc = ap->ops->qc_defer(qc)))
			goto defer;
	}

L
Linus Torvalds 已提交
1496
	/* select device, send command to hardware */
1497
	ata_qc_issue(qc);
L
Linus Torvalds 已提交
1498 1499

	VPRINTK("EXIT\n");
1500
	return 0;
L
Linus Torvalds 已提交
1501

1502 1503
early_finish:
        ata_qc_free(qc);
1504
	qc->scsidone(cmd);
1505
	DPRINTK("EXIT - early finish (good or error)\n");
1506
	return 0;
1507 1508

err_did:
L
Linus Torvalds 已提交
1509
	ata_qc_free(qc);
1510
	cmd->result = (DID_ERROR << 16);
1511
	qc->scsidone(cmd);
1512
err_mem:
1513
	DPRINTK("EXIT - internal\n");
1514
	return 0;
1515 1516

defer:
1517
	ata_qc_free(qc);
1518
	DPRINTK("EXIT - defer\n");
1519 1520 1521 1522
	if (rc == ATA_DEFER_LINK)
		return SCSI_MLQUEUE_DEVICE_BUSY;
	else
		return SCSI_MLQUEUE_HOST_BUSY;
L
Linus Torvalds 已提交
1523 1524 1525 1526 1527 1528 1529 1530 1531 1532
}

/**
 *	ata_scsi_rbuf_get - Map response buffer.
 *	@cmd: SCSI command containing buffer to be mapped.
 *	@buf_out: Pointer to mapped area.
 *
 *	Maps buffer contained within SCSI command @cmd.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1533
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
 *
 *	RETURNS:
 *	Length of response buffer.
 */

static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
{
	u8 *buf;
	unsigned int buflen;

1544
	struct scatterlist *sg = scsi_sglist(cmd);
L
Linus Torvalds 已提交
1545

1546
	if (sg) {
1547
		buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
L
Linus Torvalds 已提交
1548 1549
		buflen = sg->length;
	} else {
1550 1551
		buf = NULL;
		buflen = 0;
L
Linus Torvalds 已提交
1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
	}

	*buf_out = buf;
	return buflen;
}

/**
 *	ata_scsi_rbuf_put - Unmap response buffer.
 *	@cmd: SCSI command containing buffer to be unmapped.
 *	@buf: buffer to unmap
 *
 *	Unmaps response buffer contained within @cmd.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1566
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
1567 1568 1569 1570
 */

static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
{
1571
	struct scatterlist *sg = scsi_sglist(cmd);
1572
	if (sg)
1573
		kunmap_atomic(buf - sg->offset, KM_IRQ0);
L
Linus Torvalds 已提交
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584
}

/**
 *	ata_scsi_rbuf_fill - wrapper for SCSI command simulators
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@actor: Callback hook for desired SCSI command simulator
 *
 *	Takes care of the hard work of simulating a SCSI command...
 *	Mapping the response buffer, calling the command's handler,
 *	and handling the handler's return value.  This return value
 *	indicates whether the handler wishes the SCSI command to be
1585 1586
 *	completed successfully (0), or not (in which case cmd->result
 *	and sense buffer are assumed to be set).
L
Linus Torvalds 已提交
1587 1588
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1589
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604
 */

void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
		        unsigned int (*actor) (struct ata_scsi_args *args,
			     		   u8 *rbuf, unsigned int buflen))
{
	u8 *rbuf;
	unsigned int buflen, rc;
	struct scsi_cmnd *cmd = args->cmd;

	buflen = ata_scsi_rbuf_get(cmd, &rbuf);
	memset(rbuf, 0, buflen);
	rc = actor(args, rbuf, buflen);
	ata_scsi_rbuf_put(cmd, rbuf);

1605
	if (rc == 0)
L
Linus Torvalds 已提交
1606
		cmd->result = SAM_STAT_GOOD;
1607
	args->done(cmd);
L
Linus Torvalds 已提交
1608 1609
}

1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625
/**
 *	ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer
 *	@idx: byte index into SCSI response buffer
 *	@val: value to set
 *
 *	To be used by SCSI command simulator functions.  This macros
 *	expects two local variables, u8 *rbuf and unsigned int buflen,
 *	are in scope.
 *
 *	LOCKING:
 *	None.
 */
#define ATA_SCSI_RBUF_SET(idx, val) do { \
		if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \
	} while (0)

L
Linus Torvalds 已提交
1626 1627 1628 1629 1630 1631 1632
/**
 *	ata_scsiop_inq_std - Simulate INQUIRY command
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
 *	Returns standard device identification data associated
J
Jeff Garzik 已提交
1633
 *	with non-VPD INQUIRY command output.
L
Linus Torvalds 已提交
1634 1635
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1636
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659
 */

unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
			       unsigned int buflen)
{
	u8 hdr[] = {
		TYPE_DISK,
		0,
		0x5,	/* claim SPC-3 version compatibility */
		2,
		95 - 4
	};

	/* set scsi removeable (RMB) bit per ata bit */
	if (ata_id_removeable(args->id))
		hdr[1] |= (1 << 7);

	VPRINTK("ENTER\n");

	memcpy(rbuf, hdr, sizeof(hdr));

	if (buflen > 35) {
		memcpy(&rbuf[8], "ATA     ", 8);
1660 1661
		ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
		ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
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		if (rbuf[32] == 0 || rbuf[32] == ' ')
			memcpy(&rbuf[32], "n/a ", 4);
	}

	if (buflen > 63) {
		const u8 versions[] = {
			0x60,	/* SAM-3 (no version claimed) */

			0x03,
			0x20,	/* SBC-2 (no version claimed) */

			0x02,
			0x60	/* SPC-3 (no version claimed) */
		};

		memcpy(rbuf + 59, versions, sizeof(versions));
	}

	return 0;
}

/**
J
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1684
 *	ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
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1685 1686 1687 1688
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
J
Jeff Garzik 已提交
1689
 *	Returns list of inquiry VPD pages available.
L
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1690 1691
 *
 *	LOCKING:
J
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1692
 *	spin_lock_irqsave(host lock)
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1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
 */

unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
			      unsigned int buflen)
{
	const u8 pages[] = {
		0x00,	/* page 0x00, this page */
		0x80,	/* page 0x80, unit serial no page */
		0x83	/* page 0x83, device ident page */
	};
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	rbuf[3] = sizeof(pages);	/* number of supported VPD pages */
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1704 1705 1706 1707 1708 1709 1710 1711

	if (buflen > 6)
		memcpy(rbuf + 4, pages, sizeof(pages));

	return 0;
}

/**
J
Jeff Garzik 已提交
1712
 *	ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
L
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1713 1714 1715 1716 1717 1718 1719
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
 *	Returns ATA device serial number.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1720
 *	spin_lock_irqsave(host lock)
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1721 1722 1723 1724 1725 1726 1727 1728 1729
 */

unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
			      unsigned int buflen)
{
	const u8 hdr[] = {
		0,
		0x80,			/* this page code */
		0,
1730
		ATA_ID_SERNO_LEN,	/* page len */
L
Linus Torvalds 已提交
1731 1732 1733
	};
	memcpy(rbuf, hdr, sizeof(hdr));

1734
	if (buflen > (ATA_ID_SERNO_LEN + 4 - 1))
1735
		ata_id_string(args->id, (unsigned char *) &rbuf[4],
1736
			      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
L
Linus Torvalds 已提交
1737 1738 1739 1740 1741

	return 0;
}

/**
J
Jeff Garzik 已提交
1742
 *	ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
L
Linus Torvalds 已提交
1743 1744 1745 1746
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
J
Jeff Garzik 已提交
1747 1748 1749 1750
 *	Yields two logical unit device identification designators:
 *	 - vendor specific ASCII containing the ATA serial number
 *	 - SAT defined "t10 vendor id based" containing ASCII vendor
 *	   name ("ATA     "), model and serial numbers.
L
Linus Torvalds 已提交
1751 1752
 *
 *	LOCKING:
J
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1753
 *	spin_lock_irqsave(host lock)
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1754 1755 1756 1757 1758
 */

unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
			      unsigned int buflen)
{
J
Jeff Garzik 已提交
1759 1760
	int num;
	const int sat_model_serial_desc_len = 68;
L
Linus Torvalds 已提交
1761

J
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1762 1763 1764
	rbuf[1] = 0x83;			/* this page code */
	num = 4;

1765
	if (buflen > (ATA_ID_SERNO_LEN + num + 3)) {
J
Jeff Garzik 已提交
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		/* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
1767
		rbuf[num + 0] = 2;
1768
		rbuf[num + 3] = ATA_ID_SERNO_LEN;
J
Jeff Garzik 已提交
1769 1770
		num += 4;
		ata_id_string(args->id, (unsigned char *) rbuf + num,
1771 1772
			      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
		num += ATA_ID_SERNO_LEN;
L
Linus Torvalds 已提交
1773
	}
J
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1774 1775 1776
	if (buflen > (sat_model_serial_desc_len + num + 3)) {
		/* SAT defined lu model and serial numbers descriptor */
		/* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
1777 1778
		rbuf[num + 0] = 2;
		rbuf[num + 1] = 1;
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Jeff Garzik 已提交
1779 1780 1781 1782 1783
		rbuf[num + 3] = sat_model_serial_desc_len;
		num += 4;
		memcpy(rbuf + num, "ATA     ", 8);
		num += 8;
		ata_id_string(args->id, (unsigned char *) rbuf + num,
1784 1785
			      ATA_ID_PROD, ATA_ID_PROD_LEN);
		num += ATA_ID_PROD_LEN;
J
Jeff Garzik 已提交
1786
		ata_id_string(args->id, (unsigned char *) rbuf + num,
1787 1788
			      ATA_ID_SERNO, ATA_ID_SERNO_LEN);
		num += ATA_ID_SERNO_LEN;
J
Jeff Garzik 已提交
1789 1790
	}
	rbuf[3] = num - 4;    /* page len (assume less than 256 bytes) */
L
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1791 1792 1793
	return 0;
}

1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822
/**
 *	ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
 *	Yields SAT-specified ATA VPD page.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host lock)
 */

unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf,
			      unsigned int buflen)
{
	u8 pbuf[60];
	struct ata_taskfile tf;
	unsigned int i;

	if (!buflen)
		return 0;

	memset(&pbuf, 0, sizeof(pbuf));
	memset(&tf, 0, sizeof(tf));

	pbuf[1] = 0x89;			/* our page code */
	pbuf[2] = (0x238 >> 8);		/* page size fixed at 238h */
	pbuf[3] = (0x238 & 0xff);

1823 1824 1825
	memcpy(&pbuf[8], "linux   ", 8);
	memcpy(&pbuf[16], "libata          ", 16);
	memcpy(&pbuf[32], DRV_VERSION, 4);
1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
	ata_id_string(args->id, &pbuf[32], ATA_ID_FW_REV, 4);

	/* we don't store the ATA device signature, so we fake it */

	tf.command = ATA_DRDY;		/* really, this is Status reg */
	tf.lbal = 0x1;
	tf.nsect = 0x1;

	ata_tf_to_fis(&tf, 0, 1, &pbuf[36]);	/* TODO: PMP? */
	pbuf[36] = 0x34;		/* force D2H Reg FIS (34h) */

	pbuf[56] = ATA_CMD_ID_ATA;

	i = min(buflen, 60U);
	memcpy(rbuf, &pbuf[0], i);
	buflen -= i;

	if (!buflen)
		return 0;

	memcpy(&rbuf[60], &args->id[0], min(buflen, 512U));
	return 0;
}

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Linus Torvalds 已提交
1850
/**
J
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1851
 *	ata_scsiop_noop - Command handler that simply returns success.
L
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1852 1853 1854 1855 1856 1857 1858 1859
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
 *	No operation.  Simply returns success to caller, to indicate
 *	that the caller should successfully complete this SCSI command.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
1860
 *	spin_lock_irqsave(host lock)
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1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914
 */

unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
			    unsigned int buflen)
{
	VPRINTK("ENTER\n");
	return 0;
}

/**
 *	ata_msense_push - Push data onto MODE SENSE data output buffer
 *	@ptr_io: (input/output) Location to store more output data
 *	@last: End of output data buffer
 *	@buf: Pointer to BLOB being added to output buffer
 *	@buflen: Length of BLOB
 *
 *	Store MODE SENSE data on an output buffer.
 *
 *	LOCKING:
 *	None.
 */

static void ata_msense_push(u8 **ptr_io, const u8 *last,
			    const u8 *buf, unsigned int buflen)
{
	u8 *ptr = *ptr_io;

	if ((ptr + buflen - 1) > last)
		return;

	memcpy(ptr, buf, buflen);

	ptr += buflen;

	*ptr_io = ptr;
}

/**
 *	ata_msense_caching - Simulate MODE SENSE caching info page
 *	@id: device IDENTIFY data
 *	@ptr_io: (input/output) Location to store more output data
 *	@last: End of output data buffer
 *
 *	Generate a caching info page, which conditionally indicates
 *	write caching to the SCSI layer, depending on device
 *	capabilities.
 *
 *	LOCKING:
 *	None.
 */

static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
				       const u8 *last)
{
1915
	u8 page[CACHE_MPAGE_LEN];
L
Linus Torvalds 已提交
1916

1917
	memcpy(page, def_cache_mpage, sizeof(page));
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1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940
	if (ata_id_wcache_enabled(id))
		page[2] |= (1 << 2);	/* write cache enable */
	if (!ata_id_rahead_enabled(id))
		page[12] |= (1 << 5);	/* disable read ahead */

	ata_msense_push(ptr_io, last, page, sizeof(page));
	return sizeof(page);
}

/**
 *	ata_msense_ctl_mode - Simulate MODE SENSE control mode page
 *	@dev: Device associated with this MODE SENSE command
 *	@ptr_io: (input/output) Location to store more output data
 *	@last: End of output data buffer
 *
 *	Generate a generic MODE SENSE control mode page.
 *
 *	LOCKING:
 *	None.
 */

static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
{
1941 1942 1943
	ata_msense_push(ptr_io, last, def_control_mpage,
			sizeof(def_control_mpage));
	return sizeof(def_control_mpage);
L
Linus Torvalds 已提交
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960
}

/**
 *	ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
 *	@dev: Device associated with this MODE SENSE command
 *	@ptr_io: (input/output) Location to store more output data
 *	@last: End of output data buffer
 *
 *	Generate a generic MODE SENSE r/w error recovery page.
 *
 *	LOCKING:
 *	None.
 */

static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
{

1961 1962 1963
	ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
			sizeof(def_rw_recovery_mpage));
	return sizeof(def_rw_recovery_mpage);
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Linus Torvalds 已提交
1964 1965
}

1966 1967 1968 1969 1970 1971
/*
 * We can turn this into a real blacklist if it's needed, for now just
 * blacklist any Maxtor BANC1G10 revision firmware
 */
static int ata_dev_supports_fua(u16 *id)
{
1972
	unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
1973

J
Jeff Garzik 已提交
1974 1975
	if (!libata_fua)
		return 0;
1976 1977 1978
	if (!ata_id_has_fua(id))
		return 0;

1979 1980
	ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
	ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
1981

1982
	if (strcmp(model, "Maxtor"))
1983
		return 1;
1984
	if (strcmp(fw, "BANC1G10"))
1985 1986 1987 1988 1989
		return 1;

	return 0; /* blacklisted */
}

L
Linus Torvalds 已提交
1990 1991 1992 1993 1994 1995
/**
 *	ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
1996 1997 1998
 *	Simulate MODE SENSE commands. Assume this is invoked for direct
 *	access devices (e.g. disks) only. There should be no block
 *	descriptor for other device types.
L
Linus Torvalds 已提交
1999 2000
 *
 *	LOCKING:
J
Jeff Garzik 已提交
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 *	spin_lock_irqsave(host lock)
L
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2002 2003 2004 2005 2006
 */

unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
				  unsigned int buflen)
{
T
Tejun Heo 已提交
2007
	struct ata_device *dev = args->dev;
L
Linus Torvalds 已提交
2008
	u8 *scsicmd = args->cmd->cmnd, *p, *last;
2009 2010 2011 2012 2013 2014 2015
	const u8 sat_blk_desc[] = {
		0, 0, 0, 0,	/* number of blocks: sat unspecified */
		0,
		0, 0x2, 0x0	/* block length: 512 bytes */
	};
	u8 pg, spg;
	unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
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Tejun Heo 已提交
2016
	u8 dpofua;
L
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2017 2018 2019 2020

	VPRINTK("ENTER\n");

	six_byte = (scsicmd[0] == MODE_SENSE);
2021 2022 2023
	ebd = !(scsicmd[1] & 0x8);      /* dbd bit inverted == edb */
	/*
	 * LLBA bit in msense(10) ignored (compliant)
L
Linus Torvalds 已提交
2024
	 */
2025

L
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2026
	page_control = scsicmd[2] >> 6;
2027 2028 2029 2030 2031 2032 2033 2034 2035 2036
	switch (page_control) {
	case 0: /* current */
		break;  /* supported */
	case 3: /* saved */
		goto saving_not_supp;
	case 1: /* changeable */
	case 2: /* defaults */
	default:
		goto invalid_fld;
	}
L
Linus Torvalds 已提交
2037

2038 2039 2040 2041 2042 2043 2044 2045
	if (six_byte) {
		output_len = 4 + (ebd ? 8 : 0);
		alloc_len = scsicmd[4];
	} else {
		output_len = 8 + (ebd ? 8 : 0);
		alloc_len = (scsicmd[7] << 8) + scsicmd[8];
	}
	minlen = (alloc_len < buflen) ? alloc_len : buflen;
L
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2046 2047

	p = rbuf + output_len;
2048
	last = rbuf + minlen - 1;
L
Linus Torvalds 已提交
2049

2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060
	pg = scsicmd[2] & 0x3f;
	spg = scsicmd[3];
	/*
	 * No mode subpages supported (yet) but asking for _all_
	 * subpages may be valid
	 */
	if (spg && (spg != ALL_SUB_MPAGES))
		goto invalid_fld;

	switch(pg) {
	case RW_RECOVERY_MPAGE:
L
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2061 2062 2063
		output_len += ata_msense_rw_recovery(&p, last);
		break;

2064
	case CACHE_MPAGE:
L
Linus Torvalds 已提交
2065 2066 2067
		output_len += ata_msense_caching(args->id, &p, last);
		break;

2068
	case CONTROL_MPAGE: {
L
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2069 2070 2071 2072
		output_len += ata_msense_ctl_mode(&p, last);
		break;
		}

2073
	case ALL_MPAGES:
L
Linus Torvalds 已提交
2074 2075 2076 2077 2078 2079
		output_len += ata_msense_rw_recovery(&p, last);
		output_len += ata_msense_caching(args->id, &p, last);
		output_len += ata_msense_ctl_mode(&p, last);
		break;

	default:		/* invalid page code */
2080
		goto invalid_fld;
L
Linus Torvalds 已提交
2081 2082
	}

2083 2084
	if (minlen < 1)
		return 0;
T
Tejun Heo 已提交
2085 2086

	dpofua = 0;
2087
	if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
T
Tejun Heo 已提交
2088 2089 2090
	    (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
		dpofua = 1 << 4;

L
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2091 2092 2093
	if (six_byte) {
		output_len--;
		rbuf[0] = output_len;
T
Tejun Heo 已提交
2094 2095
		if (minlen > 2)
			rbuf[2] |= dpofua;
2096 2097 2098 2099 2100 2101 2102
		if (ebd) {
			if (minlen > 3)
				rbuf[3] = sizeof(sat_blk_desc);
			if (minlen > 11)
				memcpy(rbuf + 4, sat_blk_desc,
				       sizeof(sat_blk_desc));
		}
L
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2103 2104 2105
	} else {
		output_len -= 2;
		rbuf[0] = output_len >> 8;
2106 2107
		if (minlen > 1)
			rbuf[1] = output_len;
T
Tejun Heo 已提交
2108 2109
		if (minlen > 3)
			rbuf[3] |= dpofua;
2110 2111 2112 2113 2114 2115 2116
		if (ebd) {
			if (minlen > 7)
				rbuf[7] = sizeof(sat_blk_desc);
			if (minlen > 15)
				memcpy(rbuf + 8, sat_blk_desc,
				       sizeof(sat_blk_desc));
		}
L
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2117 2118
	}
	return 0;
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128

invalid_fld:
	ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
	/* "Invalid field in cbd" */
	return 1;

saving_not_supp:
	ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
	 /* "Saving parameters not supported" */
	return 1;
L
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2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139
}

/**
 *	ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
 *	Simulate READ CAPACITY commands.
 *
 *	LOCKING:
2140
 *	None.
L
Linus Torvalds 已提交
2141 2142 2143 2144
 */
unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
			        unsigned int buflen)
{
2145
	u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
L
Linus Torvalds 已提交
2146 2147 2148 2149

	VPRINTK("ENTER\n");

	if (args->cmd->cmnd[0] == READ_CAPACITY) {
2150 2151
		if (last_lba >= 0xffffffffULL)
			last_lba = 0xffffffff;
2152

L
Linus Torvalds 已提交
2153
		/* sector count, 32-bit */
2154 2155 2156 2157
		ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3));
		ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2));
		ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1));
		ATA_SCSI_RBUF_SET(3, last_lba);
L
Linus Torvalds 已提交
2158 2159

		/* sector size */
2160 2161
		ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8);
		ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE);
L
Linus Torvalds 已提交
2162 2163
	} else {
		/* sector count, 64-bit */
2164 2165 2166 2167 2168 2169 2170 2171
		ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7));
		ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6));
		ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5));
		ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4));
		ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3));
		ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2));
		ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1));
		ATA_SCSI_RBUF_SET(7, last_lba);
L
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2172 2173

		/* sector size */
2174 2175
		ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8);
		ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE);
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2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189
	}

	return 0;
}

/**
 *	ata_scsiop_report_luns - Simulate REPORT LUNS command
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
 *	Simulate REPORT LUNS command.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2190
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201
 */

unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
				   unsigned int buflen)
{
	VPRINTK("ENTER\n");
	rbuf[3] = 8;	/* just one lun, LUN 0, size 8 bytes */

	return 0;
}

2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229
/**
 *	ata_scsi_set_sense - Set SCSI sense data and status
 *	@cmd: SCSI request to be handled
 *	@sk: SCSI-defined sense key
 *	@asc: SCSI-defined additional sense code
 *	@ascq: SCSI-defined additional sense code qualifier
 *
 *	Helper function that builds a valid fixed format, current
 *	response code and the given sense key (sk), additional sense
 *	code (asc) and additional sense code qualifier (ascq) with
 *	a SCSI command status of %SAM_STAT_CHECK_CONDITION and
 *	DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
 *
 *	LOCKING:
 *	Not required
 */

void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
{
	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;

	cmd->sense_buffer[0] = 0x70;	/* fixed format, current */
	cmd->sense_buffer[2] = sk;
	cmd->sense_buffer[7] = 18 - 8;	/* additional sense length */
	cmd->sense_buffer[12] = asc;
	cmd->sense_buffer[13] = ascq;
}

L
Linus Torvalds 已提交
2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241
/**
 *	ata_scsi_badcmd - End a SCSI request with an error
 *	@cmd: SCSI request to be handled
 *	@done: SCSI command completion function
 *	@asc: SCSI-defined additional sense code
 *	@ascq: SCSI-defined additional sense code qualifier
 *
 *	Helper function that completes a SCSI command with
 *	%SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
 *	and the specified additional sense codes.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2242
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
2243 2244 2245 2246 2247
 */

void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
{
	DPRINTK("ENTER\n");
2248
	ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
L
Linus Torvalds 已提交
2249 2250 2251 2252

	done(cmd);
}

2253
static void atapi_sense_complete(struct ata_queued_cmd *qc)
2254
{
2255
	if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2256 2257 2258 2259 2260
		/* FIXME: not quite right; we don't want the
		 * translation of taskfile registers into
		 * a sense descriptors, since that's only
		 * correct for ATA, not ATAPI
		 */
2261
		ata_gen_passthru_sense(qc);
2262
	}
2263

2264
	qc->scsidone(qc->scsicmd);
2265
	ata_qc_free(qc);
2266
}
2267

2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279
/* is it pointless to prefer PIO for "safety reasons"? */
static inline int ata_pio_use_silly(struct ata_port *ap)
{
	return (ap->flags & ATA_FLAG_PIO_DMA);
}

static void atapi_request_sense(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct scsi_cmnd *cmd = qc->scsicmd;

	DPRINTK("ATAPI request sense\n");
2280 2281 2282 2283

	/* FIXME: is this needed? */
	memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));

2284 2285 2286 2287 2288 2289 2290 2291
	ap->ops->tf_read(ap, &qc->tf);

	/* fill these in, for the case where they are -not- overwritten */
	cmd->sense_buffer[0] = 0x70;
	cmd->sense_buffer[2] = qc->tf.feature >> 4;

	ata_qc_reinit(qc);

2292 2293 2294
	ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
	qc->dma_dir = DMA_FROM_DEVICE;

2295
	memset(&qc->cdb, 0, qc->dev->cdb_len);
2296 2297 2298 2299 2300 2301
	qc->cdb[0] = REQUEST_SENSE;
	qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;

	qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	qc->tf.command = ATA_CMD_PACKET;

2302 2303 2304 2305 2306
	if (ata_pio_use_silly(ap)) {
		qc->tf.protocol = ATA_PROT_ATAPI_DMA;
		qc->tf.feature |= ATAPI_PKT_DMA;
	} else {
		qc->tf.protocol = ATA_PROT_ATAPI;
A
Alan Cox 已提交
2307 2308
		qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
		qc->tf.lbah = 0;
2309
	}
2310 2311
	qc->nbytes = SCSI_SENSE_BUFFERSIZE;

2312
	qc->complete_fn = atapi_sense_complete;
2313

2314
	ata_qc_issue(qc);
2315 2316 2317 2318

	DPRINTK("EXIT\n");
}

2319
static void atapi_qc_complete(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
2320 2321
{
	struct scsi_cmnd *cmd = qc->scsicmd;
2322
	unsigned int err_mask = qc->err_mask;
L
Linus Torvalds 已提交
2323

2324
	VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
J
Jeff Garzik 已提交
2325

2326 2327 2328 2329 2330 2331 2332 2333 2334 2335
	/* handle completion from new EH */
	if (unlikely(qc->ap->ops->error_handler &&
		     (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {

		if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
			/* FIXME: not quite right; we don't want the
			 * translation of taskfile registers into a
			 * sense descriptors, since that's only
			 * correct for ATA, not ATAPI
			 */
2336
			ata_gen_passthru_sense(qc);
2337 2338
		}

2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351
		/* SCSI EH automatically locks door if sdev->locked is
		 * set.  Sometimes door lock request continues to
		 * fail, for example, when no media is present.  This
		 * creates a loop - SCSI EH issues door lock which
		 * fails and gets invoked again to acquire sense data
		 * for the failed command.
		 *
		 * If door lock fails, always clear sdev->locked to
		 * avoid this infinite loop.
		 */
		if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
			qc->dev->sdev->locked = 0;

2352 2353 2354 2355 2356 2357 2358
		qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
		qc->scsidone(cmd);
		ata_qc_free(qc);
		return;
	}

	/* successful completion or old EH failure path */
2359
	if (unlikely(err_mask & AC_ERR_DEV)) {
L
Linus Torvalds 已提交
2360
		cmd->result = SAM_STAT_CHECK_CONDITION;
2361
		atapi_request_sense(qc);
2362
		return;
2363
	} else if (unlikely(err_mask)) {
2364 2365 2366 2367 2368
		/* FIXME: not quite right; we don't want the
		 * translation of taskfile registers into
		 * a sense descriptors, since that's only
		 * correct for ATA, not ATAPI
		 */
2369
		ata_gen_passthru_sense(qc);
2370
	} else {
L
Linus Torvalds 已提交
2371 2372
		u8 *scsicmd = cmd->cmnd;

2373
		if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
L
Linus Torvalds 已提交
2374 2375 2376 2377
			u8 *buf = NULL;
			unsigned int buflen;

			buflen = ata_scsi_rbuf_get(cmd, &buf);
2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391

	/* ATAPI devices typically report zero for their SCSI version,
	 * and sometimes deviate from the spec WRT response data
	 * format.  If SCSI version is reported as zero like normal,
	 * then we make the following fixups:  1) Fake MMC-5 version,
	 * to indicate to the Linux scsi midlayer this is a modern
	 * device.  2) Ensure response data format / ATAPI information
	 * are always correct.
	 */
			if (buf[2] == 0) {
				buf[2] = 0x5;
				buf[3] = 0x32;
			}

L
Linus Torvalds 已提交
2392 2393
			ata_scsi_rbuf_put(cmd, buf);
		}
2394

L
Linus Torvalds 已提交
2395 2396 2397 2398
		cmd->result = SAM_STAT_GOOD;
	}

	qc->scsidone(cmd);
2399
	ata_qc_free(qc);
L
Linus Torvalds 已提交
2400 2401 2402 2403 2404 2405
}
/**
 *	atapi_xlat - Initialize PACKET taskfile
 *	@qc: command structure to be initialized
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2406
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
2407 2408 2409 2410
 *
 *	RETURNS:
 *	Zero on success, non-zero on failure.
 */
2411
static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
L
Linus Torvalds 已提交
2412
{
2413
	struct scsi_cmnd *scmd = qc->scsicmd;
L
Linus Torvalds 已提交
2414 2415
	struct ata_device *dev = qc->dev;
	int using_pio = (dev->flags & ATA_DFLAG_PIO);
2416
	int nodata = (scmd->sc_data_direction == DMA_NONE);
A
Alan Cox 已提交
2417
	unsigned int nbytes;
L
Linus Torvalds 已提交
2418

2419 2420
	memset(qc->cdb, 0, dev->cdb_len);
	memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
L
Linus Torvalds 已提交
2421 2422 2423 2424

	qc->complete_fn = atapi_qc_complete;

	qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2425
	if (scmd->sc_data_direction == DMA_TO_DEVICE) {
L
Linus Torvalds 已提交
2426 2427 2428 2429 2430
		qc->tf.flags |= ATA_TFLAG_WRITE;
		DPRINTK("direction: write\n");
	}

	qc->tf.command = ATA_CMD_PACKET;
2431
	qc->nbytes = scsi_bufflen(scmd);
2432 2433 2434 2435

	/* check whether ATAPI DMA is safe */
	if (!using_pio && ata_check_atapi_dma(qc))
		using_pio = 1;
L
Linus Torvalds 已提交
2436

A
Alan Cox 已提交
2437 2438 2439 2440 2441 2442 2443 2444
	/* Some controller variants snoop this value for Packet transfers
	   to do state machine and FIFO management. Thus we want to set it
	   properly, and for DMA where it is effectively meaningless */
	nbytes = min(qc->nbytes, (unsigned int)63 * 1024);

	qc->tf.lbam = (nbytes & 0xFF);
	qc->tf.lbah = (nbytes >> 8);

L
Linus Torvalds 已提交
2445
	if (using_pio || nodata) {
2446
		/* no data, or PIO data xfer */
L
Linus Torvalds 已提交
2447 2448 2449 2450
		if (nodata)
			qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
		else
			qc->tf.protocol = ATA_PROT_ATAPI;
2451 2452
	} else {
		/* DMA data xfer */
L
Linus Torvalds 已提交
2453 2454 2455
		qc->tf.protocol = ATA_PROT_ATAPI_DMA;
		qc->tf.feature |= ATAPI_PKT_DMA;

2456
		if (atapi_dmadir && (scmd->sc_data_direction != DMA_TO_DEVICE))
2457
			/* some SATA bridges need us to indicate data xfer direction */
L
Linus Torvalds 已提交
2458 2459 2460
			qc->tf.feature |= ATAPI_DMADIR;
	}

A
Alan Cox 已提交
2461 2462 2463

	/* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
	   as ATAPI tape drives don't get this right otherwise */
L
Linus Torvalds 已提交
2464 2465 2466
	return 0;
}

2467
static struct ata_device * ata_find_dev(struct ata_port *ap, int devno)
2468
{
2469 2470 2471 2472 2473 2474 2475 2476
	if (ap->nr_pmp_links == 0) {
		if (likely(devno < ata_link_max_devices(&ap->link)))
			return &ap->link.device[devno];
	} else {
		if (likely(devno < ap->nr_pmp_links))
			return &ap->pmp_link[devno].device[0];
	}

2477 2478 2479 2480 2481 2482
	return NULL;
}

static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
					const struct scsi_device *scsidev)
{
2483 2484
	int devno;

2485
	/* skip commands not addressed to targets we simulate */
2486 2487 2488 2489 2490 2491 2492 2493 2494
	if (ap->nr_pmp_links == 0) {
		if (unlikely(scsidev->channel || scsidev->lun))
			return NULL;
		devno = scsidev->id;
	} else {
		if (unlikely(scsidev->id || scsidev->lun))
			return NULL;
		devno = scsidev->channel;
	}
2495

2496
	return ata_find_dev(ap, devno);
2497 2498
}

2499 2500 2501 2502 2503 2504 2505
/**
 *	ata_scsi_dev_enabled - determine if device is enabled
 *	@dev: ATA device
 *
 *	Determine if commands should be sent to the specified device.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2506
 *	spin_lock_irqsave(host lock)
2507 2508 2509 2510 2511 2512 2513 2514 2515 2516
 *
 *	RETURNS:
 *	0 if commands are not allowed / 1 if commands are allowed
 */

static int ata_scsi_dev_enabled(struct ata_device *dev)
{
	if (unlikely(!ata_dev_enabled(dev)))
		return 0;

T
Tejun Heo 已提交
2517
	if (!atapi_enabled || (dev->link->ap->flags & ATA_FLAG_NO_ATAPI)) {
2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528
		if (unlikely(dev->class == ATA_DEV_ATAPI)) {
			ata_dev_printk(dev, KERN_WARNING,
				       "WARNING: ATAPI is %s, device ignored.\n",
				       atapi_enabled ? "not supported with this driver" : "disabled");
			return 0;
		}
	}

	return 1;
}

L
Linus Torvalds 已提交
2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539
/**
 *	ata_scsi_find_dev - lookup ata_device from scsi_cmnd
 *	@ap: ATA port to which the device is attached
 *	@scsidev: SCSI device from which we derive the ATA device
 *
 *	Given various information provided in struct scsi_cmnd,
 *	map that onto an ATA bus, and using that mapping
 *	determine which ata_device is associated with the
 *	SCSI command to be sent.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2540
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
2541 2542 2543 2544 2545
 *
 *	RETURNS:
 *	Associated ATA device, or %NULL if not found.
 */
static struct ata_device *
J
Jeff Garzik 已提交
2546
ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
L
Linus Torvalds 已提交
2547
{
2548
	struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
L
Linus Torvalds 已提交
2549

2550
	if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
L
Linus Torvalds 已提交
2551 2552 2553 2554 2555
		return NULL;

	return dev;
}

2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570
/*
 *	ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
 *	@byte1: Byte 1 from pass-thru CDB.
 *
 *	RETURNS:
 *	ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
 */
static u8
ata_scsi_map_proto(u8 byte1)
{
	switch((byte1 & 0x1e) >> 1) {
		case 3:		/* Non-data */
			return ATA_PROT_NODATA;

		case 6:		/* DMA */
A
Albert Lee 已提交
2571 2572
		case 10:	/* UDMA Data-in */
		case 11:	/* UDMA Data-Out */
2573 2574 2575 2576 2577 2578 2579 2580
			return ATA_PROT_DMA;

		case 4:		/* PIO Data-in */
		case 5:		/* PIO Data-out */
			return ATA_PROT_PIO;

		case 0:		/* Hard Reset */
		case 1:		/* SRST */
2581 2582 2583 2584 2585
		case 8:		/* Device Diagnostic */
		case 9:		/* Device Reset */
		case 7:		/* DMA Queued */
		case 12:	/* FPDMA */
		case 15:	/* Return Response Info */
2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601
		default:	/* Reserved */
			break;
	}

	return ATA_PROT_UNKNOWN;
}

/**
 *	ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
 *	@qc: command structure to be initialized
 *
 *	Handles either 12 or 16-byte versions of the CDB.
 *
 *	RETURNS:
 *	Zero on success, non-zero on failure.
 */
2602
static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2603 2604
{
	struct ata_taskfile *tf = &(qc->tf);
2605
	struct scsi_cmnd *scmd = qc->scsicmd;
2606
	struct ata_device *dev = qc->dev;
2607
	const u8 *cdb = scmd->cmnd;
2608

2609
	if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2610
		goto invalid_fld;
2611

2612 2613 2614
	/* We may not issue DMA commands if no DMA mode is set */
	if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
		goto invalid_fld;
2615 2616 2617 2618 2619

	/*
	 * 12 and 16 byte CDBs use different offsets to
	 * provide the various register values.
	 */
2620
	if (cdb[0] == ATA_16) {
2621 2622 2623 2624 2625
		/*
		 * 16-byte CDB - may contain extended commands.
		 *
		 * If that is the case, copy the upper byte register values.
		 */
2626 2627 2628 2629 2630 2631
		if (cdb[1] & 0x01) {
			tf->hob_feature = cdb[3];
			tf->hob_nsect = cdb[5];
			tf->hob_lbal = cdb[7];
			tf->hob_lbam = cdb[9];
			tf->hob_lbah = cdb[11];
2632 2633 2634 2635 2636 2637 2638
			tf->flags |= ATA_TFLAG_LBA48;
		} else
			tf->flags &= ~ATA_TFLAG_LBA48;

		/*
		 * Always copy low byte, device and command registers.
		 */
2639 2640 2641 2642 2643 2644 2645
		tf->feature = cdb[4];
		tf->nsect = cdb[6];
		tf->lbal = cdb[8];
		tf->lbam = cdb[10];
		tf->lbah = cdb[12];
		tf->device = cdb[13];
		tf->command = cdb[14];
2646 2647 2648 2649 2650 2651
	} else {
		/*
		 * 12-byte CDB - incapable of extended commands.
		 */
		tf->flags &= ~ATA_TFLAG_LBA48;

2652 2653 2654 2655 2656 2657 2658
		tf->feature = cdb[3];
		tf->nsect = cdb[4];
		tf->lbal = cdb[5];
		tf->lbam = cdb[6];
		tf->lbah = cdb[7];
		tf->device = cdb[8];
		tf->command = cdb[9];
2659
	}
2660 2661 2662 2663

	/* enforce correct master/slave bit */
	tf->device = dev->devno ?
		tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2664

2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678
	/* sanity check for pio multi commands */
	if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
		goto invalid_fld;

	if (is_multi_taskfile(tf)) {
		unsigned int multi_count = 1 << (cdb[1] >> 5);

		/* compare the passed through multi_count
		 * with the cached multi_count of libata
		 */
		if (multi_count != dev->multi_count)
			ata_dev_printk(dev, KERN_WARNING,
				       "invalid multi_count %u ignored\n",
				       multi_count);
2679
	}
2680

2681 2682 2683 2684 2685 2686 2687 2688 2689
	/* READ/WRITE LONG use a non-standard sect_size */
	qc->sect_size = ATA_SECT_SIZE;
	switch (tf->command) {
	case ATA_CMD_READ_LONG:
	case ATA_CMD_READ_LONG_ONCE:
	case ATA_CMD_WRITE_LONG:
	case ATA_CMD_WRITE_LONG_ONCE:
		if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
			goto invalid_fld;
2690
		qc->sect_size = scsi_bufflen(scmd);
2691 2692
	}

2693 2694 2695 2696 2697 2698 2699 2700 2701
	/*
	 * Filter SET_FEATURES - XFER MODE command -- otherwise,
	 * SET_FEATURES - XFER MODE must be preceded/succeeded
	 * by an update to hardware-specific registers for each
	 * controller (i.e. the reason for ->set_piomode(),
	 * ->set_dmamode(), and ->post_set_mode() hooks).
	 */
	if ((tf->command == ATA_CMD_SET_FEATURES)
	 && (tf->feature == SETFEATURES_XFER))
2702
		goto invalid_fld;
2703 2704 2705 2706 2707 2708 2709 2710

	/*
	 * Set flags so that all registers will be written,
	 * and pass on write indication (used for PIO/DMA
	 * setup.)
	 */
	tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);

2711
	if (scmd->sc_data_direction == DMA_TO_DEVICE)
2712 2713 2714 2715 2716 2717 2718 2719
		tf->flags |= ATA_TFLAG_WRITE;

	/*
	 * Set transfer length.
	 *
	 * TODO: find out if we need to do more here to
	 *       cover scatter/gather case.
	 */
2720
	qc->nbytes = scsi_bufflen(scmd);
2721

2722 2723 2724
	/* request result TF */
	qc->flags |= ATA_QCFLAG_RESULT_TF;

2725
	return 0;
2726 2727

 invalid_fld:
2728
	ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
2729 2730
	/* "Invalid field in cdb" */
	return 1;
2731 2732
}

L
Linus Torvalds 已提交
2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764
/**
 *	ata_get_xlat_func - check if SCSI to ATA translation is possible
 *	@dev: ATA device
 *	@cmd: SCSI command opcode to consider
 *
 *	Look up the SCSI command given, and determine whether the
 *	SCSI command is to be translated or simulated.
 *
 *	RETURNS:
 *	Pointer to translation function if possible, %NULL if not.
 */

static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
{
	switch (cmd) {
	case READ_6:
	case READ_10:
	case READ_16:

	case WRITE_6:
	case WRITE_10:
	case WRITE_16:
		return ata_scsi_rw_xlat;

	case SYNCHRONIZE_CACHE:
		if (ata_try_flush_cache(dev))
			return ata_scsi_flush_xlat;
		break;

	case VERIFY:
	case VERIFY_16:
		return ata_scsi_verify_xlat;
2765 2766 2767 2768

	case ATA_12:
	case ATA_16:
		return ata_scsi_pass_thru;
2769

2770 2771
	case START_STOP:
		return ata_scsi_start_stop_xlat;
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2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792
	}

	return NULL;
}

/**
 *	ata_scsi_dump_cdb - dump SCSI command contents to dmesg
 *	@ap: ATA port to which the command was being sent
 *	@cmd: SCSI command to dump
 *
 *	Prints the contents of a SCSI command via printk().
 */

static inline void ata_scsi_dump_cdb(struct ata_port *ap,
				     struct scsi_cmnd *cmd)
{
#ifdef ATA_DEBUG
	struct scsi_device *scsidev = cmd->device;
	u8 *scsicmd = cmd->cmnd;

	DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
T
Tejun Heo 已提交
2793
		ap->print_id,
L
Linus Torvalds 已提交
2794 2795 2796 2797 2798 2799 2800
		scsidev->channel, scsidev->id, scsidev->lun,
		scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
		scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
		scsicmd[8]);
#endif
}

2801
static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2802 2803
				      void (*done)(struct scsi_cmnd *),
				      struct ata_device *dev)
2804
{
2805 2806
	u8 scsi_op = scmd->cmnd[0];
	ata_xlat_func_t xlat_func;
2807 2808
	int rc = 0;

2809
	if (dev->class == ATA_DEV_ATA) {
2810 2811
		if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
			goto bad_cdb_len;
2812

2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837
		xlat_func = ata_get_xlat_func(dev, scsi_op);
	} else {
		if (unlikely(!scmd->cmd_len))
			goto bad_cdb_len;

		xlat_func = NULL;
		if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
			/* relay SCSI command to ATAPI device */
			if (unlikely(scmd->cmd_len > dev->cdb_len))
				goto bad_cdb_len;

			xlat_func = atapi_xlat;
		} else {
			/* ATA_16 passthru, treat as an ATA command */
			if (unlikely(scmd->cmd_len > 16))
				goto bad_cdb_len;

			xlat_func = ata_get_xlat_func(dev, scsi_op);
		}
	}

	if (xlat_func)
		rc = ata_scsi_translate(dev, scmd, done, xlat_func);
	else
		ata_scsi_simulate(dev, scmd, done);
2838 2839

	return rc;
2840 2841 2842 2843 2844 2845 2846

 bad_cdb_len:
	DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
		scmd->cmd_len, scsi_op, dev->cdb_len);
	scmd->result = DID_ERROR << 16;
	done(scmd);
	return 0;
2847 2848
}

L
Linus Torvalds 已提交
2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861
/**
 *	ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
 *	@cmd: SCSI command to be sent
 *	@done: Completion function, called when command is complete
 *
 *	In some cases, this function translates SCSI commands into
 *	ATA taskfiles, and queues the taskfiles to be sent to
 *	hardware.  In other cases, this function simulates a
 *	SCSI device by evaluating and responding to certain
 *	SCSI commands.  This creates the overall effect of
 *	ATA and ATAPI devices appearing as SCSI devices.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2862
 *	Releases scsi-layer-held lock, and obtains host lock.
L
Linus Torvalds 已提交
2863 2864
 *
 *	RETURNS:
2865 2866
 *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
 *	0 otherwise.
L
Linus Torvalds 已提交
2867 2868 2869 2870 2871 2872
 */
int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
	struct ata_port *ap;
	struct ata_device *dev;
	struct scsi_device *scsidev = cmd->device;
J
Jeff Garzik 已提交
2873
	struct Scsi_Host *shost = scsidev->host;
2874
	int rc = 0;
L
Linus Torvalds 已提交
2875

2876
	ap = ata_shost_to_port(shost);
J
Jeff Garzik 已提交
2877 2878

	spin_unlock(shost->host_lock);
2879
	spin_lock(ap->lock);
L
Linus Torvalds 已提交
2880 2881 2882 2883

	ata_scsi_dump_cdb(ap, cmd);

	dev = ata_scsi_find_dev(ap, scsidev);
2884
	if (likely(dev))
2885
		rc = __ata_scsi_queuecmd(cmd, done, dev);
2886
	else {
L
Linus Torvalds 已提交
2887 2888 2889 2890
		cmd->result = (DID_BAD_TARGET << 16);
		done(cmd);
	}

2891
	spin_unlock(ap->lock);
J
Jeff Garzik 已提交
2892
	spin_lock(shost->host_lock);
2893
	return rc;
L
Linus Torvalds 已提交
2894 2895 2896 2897
}

/**
 *	ata_scsi_simulate - simulate SCSI command on ATA device
2898
 *	@dev: the target device
L
Linus Torvalds 已提交
2899 2900 2901 2902 2903 2904 2905
 *	@cmd: SCSI command being sent to device.
 *	@done: SCSI command completion function.
 *
 *	Interprets and directly executes a select list of SCSI commands
 *	that can be handled internally.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
2906
 *	spin_lock_irqsave(host lock)
L
Linus Torvalds 已提交
2907 2908
 */

T
Tejun Heo 已提交
2909
void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
L
Linus Torvalds 已提交
2910 2911 2912
		      void (*done)(struct scsi_cmnd *))
{
	struct ata_scsi_args args;
J
Jeff Garzik 已提交
2913
	const u8 *scsicmd = cmd->cmnd;
2914
	u8 tmp8;
L
Linus Torvalds 已提交
2915

T
Tejun Heo 已提交
2916 2917
	args.dev = dev;
	args.id = dev->id;
L
Linus Torvalds 已提交
2918 2919 2920 2921
	args.cmd = cmd;
	args.done = done;

	switch(scsicmd[0]) {
2922 2923 2924
		/* TODO: worth improving? */
		case FORMAT_UNIT:
			ata_scsi_invalid_field(cmd, done);
L
Linus Torvalds 已提交
2925 2926 2927 2928
			break;

		case INQUIRY:
			if (scsicmd[1] & 2)	           /* is CmdDt set?  */
2929
				ata_scsi_invalid_field(cmd, done);
L
Linus Torvalds 已提交
2930 2931
			else if ((scsicmd[1] & 1) == 0)    /* is EVPD clear? */
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
2932 2933
			else switch (scsicmd[2]) {
			case 0x00:
L
Linus Torvalds 已提交
2934
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
2935 2936
				break;
			case 0x80:
L
Linus Torvalds 已提交
2937
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
2938 2939
				break;
			case 0x83:
L
Linus Torvalds 已提交
2940
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
2941 2942 2943 2944 2945
				break;
			case 0x89:
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
				break;
			default:
2946
				ata_scsi_invalid_field(cmd, done);
2947 2948
				break;
			}
L
Linus Torvalds 已提交
2949 2950 2951 2952 2953 2954 2955 2956 2957
			break;

		case MODE_SENSE:
		case MODE_SENSE_10:
			ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
			break;

		case MODE_SELECT:	/* unconditionally return */
		case MODE_SELECT_10:	/* bad-field-in-cdb */
2958
			ata_scsi_invalid_field(cmd, done);
L
Linus Torvalds 已提交
2959 2960 2961 2962 2963 2964 2965 2966 2967 2968
			break;

		case READ_CAPACITY:
			ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
			break;

		case SERVICE_ACTION_IN:
			if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
				ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
			else
2969
				ata_scsi_invalid_field(cmd, done);
L
Linus Torvalds 已提交
2970 2971 2972 2973 2974 2975 2976
			break;

		case REPORT_LUNS:
			ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
			break;

		case REQUEST_SENSE:
2977 2978 2979 2980 2981
			ata_scsi_set_sense(cmd, 0, 0, 0);
			cmd->result = (DRIVER_SENSE << 24);
			done(cmd);
			break;

2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995
		/* if we reach this, then writeback caching is disabled,
		 * turning this into a no-op.
		 */
		case SYNCHRONIZE_CACHE:
			/* fall through */

		/* no-op's, complete with success */
		case REZERO_UNIT:
		case SEEK_6:
		case SEEK_10:
		case TEST_UNIT_READY:
			ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
			break;

2996 2997 2998 2999 3000 3001 3002
		case SEND_DIAGNOSTIC:
			tmp8 = scsicmd[1] & ~(1 << 3);
			if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
				ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
			else
				ata_scsi_invalid_field(cmd, done);
			break;
L
Linus Torvalds 已提交
3003 3004 3005

		/* all other commands */
		default:
3006 3007 3008
			ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
			/* "Invalid command operation code" */
			done(cmd);
L
Linus Torvalds 已提交
3009 3010 3011 3012
			break;
	}
}

3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035
int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
{
	int i, rc;

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

		rc = -ENOMEM;
		shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
		if (!shost)
			goto err_alloc;

		*(struct ata_port **)&shost->hostdata[0] = ap;
		ap->scsi_host = shost;

		shost->transportt = &ata_scsi_transport_template;
		shost->unique_id = ap->print_id;
		shost->max_id = 16;
		shost->max_lun = 1;
		shost->max_channel = 1;
		shost->max_cmd_len = 16;

3036 3037 3038 3039 3040 3041 3042
		/* Schedule policy is determined by ->qc_defer()
		 * callback and it needs to see every deferred qc.
		 * Set host_blocked to 1 to prevent SCSI midlayer from
		 * automatically deferring requests.
		 */
		shost->max_host_blocked = 1;

3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061
		rc = scsi_add_host(ap->scsi_host, ap->host->dev);
		if (rc)
			goto err_add;
	}

	return 0;

 err_add:
	scsi_host_put(host->ports[i]->scsi_host);
 err_alloc:
	while (--i >= 0) {
		struct Scsi_Host *shost = host->ports[i]->scsi_host;

		scsi_remove_host(shost);
		scsi_host_put(shost);
	}
	return rc;
}

3062
void ata_scsi_scan_host(struct ata_port *ap, int sync)
J
Jeff Garzik 已提交
3063
{
3064 3065
	int tries = 5;
	struct ata_device *last_failed_dev = NULL;
3066
	struct ata_link *link;
3067
	struct ata_device *dev;
J
Jeff Garzik 已提交
3068

3069
	if (ap->flags & ATA_FLAG_DISABLED)
J
Jeff Garzik 已提交
3070 3071
		return;

3072
 repeat:
3073 3074 3075 3076
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link) {
			struct scsi_device *sdev;
			int channel = 0, id = 0;
3077

3078 3079
			if (!ata_dev_enabled(dev) || dev->sdev)
				continue;
3080

3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091
			if (ata_is_host_link(link))
				id = dev->devno;
			else
				channel = link->pmp;

			sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
						 NULL);
			if (!IS_ERR(sdev)) {
				dev->sdev = sdev;
				scsi_device_put(sdev);
			}
3092
		}
3093
	}
3094 3095 3096 3097 3098

	/* If we scanned while EH was in progress or allocation
	 * failure occurred, scan would have failed silently.  Check
	 * whether all devices are attached.
	 */
3099 3100 3101 3102 3103
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link) {
			if (ata_dev_enabled(dev) && !dev->sdev)
				goto exit_loop;
		}
3104
	}
3105 3106
 exit_loop:
	if (!link)
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
		return;

	/* we're missing some SCSI devices */
	if (sync) {
		/* If caller requested synchrnous scan && we've made
		 * any progress, sleep briefly and repeat.
		 */
		if (dev != last_failed_dev) {
			msleep(100);
			last_failed_dev = dev;
			goto repeat;
		}

		/* We might be failing to detect boot device, give it
		 * a few more chances.
		 */
		if (--tries) {
			msleep(100);
			goto repeat;
		}

		ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
				"failed without making any progress,\n"
				"                  switching to async\n");
	}

	queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
			   round_jiffies_relative(HZ));
J
Jeff Garzik 已提交
3135
}
3136 3137 3138 3139 3140 3141 3142

/**
 *	ata_scsi_offline_dev - offline attached SCSI device
 *	@dev: ATA device to offline attached SCSI device for
 *
 *	This function is called from ata_eh_hotplug() and responsible
 *	for taking the SCSI device attached to @dev offline.  This
J
Jeff Garzik 已提交
3143
 *	function is called with host lock which protects dev->sdev
3144 3145 3146
 *	against clearing.
 *
 *	LOCKING:
J
Jeff Garzik 已提交
3147
 *	spin_lock_irqsave(host lock)
3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159
 *
 *	RETURNS:
 *	1 if attached SCSI device exists, 0 otherwise.
 */
int ata_scsi_offline_dev(struct ata_device *dev)
{
	if (dev->sdev) {
		scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
		return 1;
	}
	return 0;
}
3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172

/**
 *	ata_scsi_remove_dev - remove attached SCSI device
 *	@dev: ATA device to remove attached SCSI device for
 *
 *	This function is called from ata_eh_scsi_hotplug() and
 *	responsible for removing the SCSI device attached to @dev.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
static void ata_scsi_remove_dev(struct ata_device *dev)
{
T
Tejun Heo 已提交
3173
	struct ata_port *ap = dev->link->ap;
3174 3175 3176 3177 3178 3179 3180 3181 3182
	struct scsi_device *sdev;
	unsigned long flags;

	/* Alas, we need to grab scan_mutex to ensure SCSI device
	 * state doesn't change underneath us and thus
	 * scsi_device_get() always succeeds.  The mutex locking can
	 * be removed if there is __scsi_device_get() interface which
	 * increments reference counts regardless of device state.
	 */
J
Jeff Garzik 已提交
3183
	mutex_lock(&ap->scsi_host->scan_mutex);
3184
	spin_lock_irqsave(ap->lock, flags);
3185

J
Jeff Garzik 已提交
3186
	/* clearing dev->sdev is protected by host lock */
3187 3188 3189 3190 3191
	sdev = dev->sdev;
	dev->sdev = NULL;

	if (sdev) {
		/* If user initiated unplug races with us, sdev can go
J
Jeff Garzik 已提交
3192
		 * away underneath us after the host lock and
3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207
		 * scan_mutex are released.  Hold onto it.
		 */
		if (scsi_device_get(sdev) == 0) {
			/* The following ensures the attached sdev is
			 * offline on return from ata_scsi_offline_dev()
			 * regardless it wins or loses the race
			 * against this function.
			 */
			scsi_device_set_state(sdev, SDEV_OFFLINE);
		} else {
			WARN_ON(1);
			sdev = NULL;
		}
	}

3208
	spin_unlock_irqrestore(ap->lock, flags);
J
Jeff Garzik 已提交
3209
	mutex_unlock(&ap->scsi_host->scan_mutex);
3210 3211 3212 3213 3214 3215 3216 3217 3218 3219

	if (sdev) {
		ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
			       sdev->sdev_gendev.bus_id);

		scsi_remove_device(sdev);
		scsi_device_put(sdev);
	}
}

3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238
static void ata_scsi_handle_link_detach(struct ata_link *link)
{
	struct ata_port *ap = link->ap;
	struct ata_device *dev;

	ata_link_for_each_dev(dev, link) {
		unsigned long flags;

		if (!(dev->flags & ATA_DFLAG_DETACHED))
			continue;

		spin_lock_irqsave(ap->lock, flags);
		dev->flags &= ~ATA_DFLAG_DETACHED;
		spin_unlock_irqrestore(ap->lock, flags);

		ata_scsi_remove_dev(dev);
	}
}

3239 3240 3241 3242 3243 3244 3245 3246
/**
 *	ata_scsi_media_change_notify - send media change event
 *	@atadev: Pointer to the disk device with media change event
 *
 *	Tell the block layer to send a media change notification
 *	event.
 *
 * 	LOCKING:
T
Tejun Heo 已提交
3247
 * 	spin_lock_irqsave(host lock)
3248
 */
T
Tejun Heo 已提交
3249
void ata_scsi_media_change_notify(struct ata_device *dev)
3250 3251
{
#ifdef OTHER_AN_PATCHES_HAVE_BEEN_APPLIED
T
Tejun Heo 已提交
3252 3253
	if (dev->sdev)
		scsi_device_event_notify(dev->sdev, SDEV_MEDIA_CHANGE);
3254 3255 3256
#endif
}

3257 3258
/**
 *	ata_scsi_hotplug - SCSI part of hotplug
3259
 *	@work: Pointer to ATA port to perform SCSI hotplug on
3260 3261 3262 3263 3264 3265 3266 3267 3268
 *
 *	Perform SCSI part of hotplug.  It's executed from a separate
 *	workqueue after EH completes.  This is necessary because SCSI
 *	hot plugging requires working EH and hot unplugging is
 *	synchronized with hot plugging with a mutex.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep).
 */
3269
void ata_scsi_hotplug(struct work_struct *work)
3270
{
3271 3272
	struct ata_port *ap =
		container_of(work, struct ata_port, hotplug_task.work);
3273
	int i;
3274

3275
	if (ap->pflags & ATA_PFLAG_UNLOADING) {
3276 3277 3278 3279 3280 3281
		DPRINTK("ENTER/EXIT - unloading\n");
		return;
	}

	DPRINTK("ENTER\n");

3282 3283 3284 3285 3286 3287 3288 3289
	/* Unplug detached devices.  We cannot use link iterator here
	 * because PMP links have to be scanned even if PMP is
	 * currently not attached.  Iterate manually.
	 */
	ata_scsi_handle_link_detach(&ap->link);
	if (ap->pmp_link)
		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
			ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3290 3291

	/* scan for new ones */
3292
	ata_scsi_scan_host(ap, 0);
3293 3294 3295

	DPRINTK("EXIT\n");
}
3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 3315 3316 3317

/**
 *	ata_scsi_user_scan - indication for user-initiated bus scan
 *	@shost: SCSI host to scan
 *	@channel: Channel to scan
 *	@id: ID to scan
 *	@lun: LUN to scan
 *
 *	This function is called when user explicitly requests bus
 *	scan.  Set probe pending flag and invoke EH.
 *
 *	LOCKING:
 *	SCSI layer (we don't care)
 *
 *	RETURNS:
 *	Zero.
 */
static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
			      unsigned int id, unsigned int lun)
{
	struct ata_port *ap = ata_shost_to_port(shost);
	unsigned long flags;
3318
	int devno, rc = 0;
3319 3320 3321 3322

	if (!ap->ops->error_handler)
		return -EOPNOTSUPP;

3323
	if (lun != SCAN_WILD_CARD && lun)
3324 3325
		return -EINVAL;

3326 3327 3328 3329 3330 3331 3332 3333 3334 3335
	if (ap->nr_pmp_links == 0) {
		if (channel != SCAN_WILD_CARD && channel)
			return -EINVAL;
		devno = id;
	} else {
		if (id != SCAN_WILD_CARD && id)
			return -EINVAL;
		devno = channel;
	}

3336
	spin_lock_irqsave(ap->lock, flags);
3337

3338 3339 3340 3341 3342 3343 3344 3345
	if (devno == SCAN_WILD_CARD) {
		struct ata_link *link;

		ata_port_for_each_link(link, ap) {
			struct ata_eh_info *ehi = &link->eh_info;
			ehi->probe_mask |= (1 << ata_link_max_devices(link)) - 1;
			ehi->action |= ATA_EH_SOFTRESET;
		}
3346
	} else {
3347
		struct ata_device *dev = ata_find_dev(ap, devno);
3348 3349

		if (dev) {
3350
			struct ata_eh_info *ehi = &dev->link->eh_info;
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Tejun Heo 已提交
3351 3352 3353
			ehi->probe_mask |= 1 << dev->devno;
			ehi->action |= ATA_EH_SOFTRESET;
			ehi->flags |= ATA_EHI_RESUME_LINK;
3354 3355 3356 3357
		} else
			rc = -EINVAL;
	}

3358
	if (rc == 0) {
3359
		ata_port_schedule_eh(ap);
3360 3361 3362 3363
		spin_unlock_irqrestore(ap->lock, flags);
		ata_port_wait_eh(ap);
	} else
		spin_unlock_irqrestore(ap->lock, flags);
3364 3365 3366

	return rc;
}
3367 3368

/**
3369
 *	ata_scsi_dev_rescan - initiate scsi_rescan_device()
3370
 *	@work: Pointer to ATA port to perform scsi_rescan_device()
3371
 *
3372 3373 3374 3375
 *	After ATA pass thru (SAT) commands are executed successfully,
 *	libata need to propagate the changes to SCSI layer.  This
 *	function must be executed from ata_aux_wq such that sdev
 *	attach/detach don't race with rescan.
3376
 *
3377 3378
 *	LOCKING:
 *	Kernel thread context (may sleep).
3379
 */
3380
void ata_scsi_dev_rescan(struct work_struct *work)
3381
{
3382 3383
	struct ata_port *ap =
		container_of(work, struct ata_port, scsi_rescan_task);
3384
	struct ata_link *link;
3385
	struct ata_device *dev;
3386
	unsigned long flags;
3387

3388 3389
	spin_lock_irqsave(ap->lock, flags);

3390 3391 3392
	ata_port_for_each_link(link, ap) {
		ata_link_for_each_dev(dev, link) {
			struct scsi_device *sdev = dev->sdev;
3393

3394 3395 3396 3397
			if (!ata_dev_enabled(dev) || !sdev)
				continue;
			if (scsi_device_get(sdev))
				continue;
3398

3399 3400 3401 3402 3403
			spin_unlock_irqrestore(ap->lock, flags);
			scsi_rescan_device(&(sdev->sdev_gendev));
			scsi_device_put(sdev);
			spin_lock_irqsave(ap->lock, flags);
		}
3404
	}
3405 3406

	spin_unlock_irqrestore(ap->lock, flags);
3407
}
3408 3409 3410

/**
 *	ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3411
 *	@host: ATA host container for all SAS ports
3412
 *	@port_info: Information from low-level host driver
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Jeff Garzik 已提交
3413
 *	@shost: SCSI host that the scsi device is attached to
3414 3415 3416 3417 3418 3419 3420 3421
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	ata_port pointer on success / NULL on failure.
 */

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Jeff Garzik 已提交
3422
struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3423
				    struct ata_port_info *port_info,
J
Jeff Garzik 已提交
3424
				    struct Scsi_Host *shost)
3425
{
3426
	struct ata_port *ap;
3427

3428
	ap = ata_port_alloc(host);
3429 3430 3431
	if (!ap)
		return NULL;

3432
	ap->port_no = 0;
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Jeff Garzik 已提交
3433
	ap->lock = shost->host_lock;
3434 3435 3436 3437 3438 3439 3440
	ap->pio_mask = port_info->pio_mask;
	ap->mwdma_mask = port_info->mwdma_mask;
	ap->udma_mask = port_info->udma_mask;
	ap->flags |= port_info->flags;
	ap->ops = port_info->port_ops;
	ap->cbl = ATA_CBL_SATA;

3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495
	return ap;
}
EXPORT_SYMBOL_GPL(ata_sas_port_alloc);

/**
 *	ata_sas_port_start - Set port up for dma.
 *	@ap: Port to initialize
 *
 *	Called just after data structures for each port are
 *	initialized.  Allocates DMA pad.
 *
 *	May be used as the port_start() entry in ata_port_operations.
 *
 *	LOCKING:
 *	Inherited from caller.
 */
int ata_sas_port_start(struct ata_port *ap)
{
	return ata_pad_alloc(ap, ap->dev);
}
EXPORT_SYMBOL_GPL(ata_sas_port_start);

/**
 *	ata_port_stop - Undo ata_sas_port_start()
 *	@ap: Port to shut down
 *
 *	Frees the DMA pad.
 *
 *	May be used as the port_stop() entry in ata_port_operations.
 *
 *	LOCKING:
 *	Inherited from caller.
 */

void ata_sas_port_stop(struct ata_port *ap)
{
	ata_pad_free(ap, ap->dev);
}
EXPORT_SYMBOL_GPL(ata_sas_port_stop);

/**
 *	ata_sas_port_init - Initialize a SATA device
 *	@ap: SATA port to initialize
 *
 *	LOCKING:
 *	PCI/etc. bus probe sem.
 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */

int ata_sas_port_init(struct ata_port *ap)
{
	int rc = ap->ops->port_start(ap);

3496 3497
	if (!rc) {
		ap->print_id = ata_print_id++;
3498
		rc = ata_bus_probe(ap);
3499
	}
3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512

	return rc;
}
EXPORT_SYMBOL_GPL(ata_sas_port_init);

/**
 *	ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
 *	@ap: SATA port to destroy
 *
 */

void ata_sas_port_destroy(struct ata_port *ap)
{
3513 3514
	if (ap->ops->port_stop)
		ap->ops->port_stop(ap);
3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530
	kfree(ap);
}
EXPORT_SYMBOL_GPL(ata_sas_port_destroy);

/**
 *	ata_sas_slave_configure - Default slave_config routine for libata devices
 *	@sdev: SCSI device to configure
 *	@ap: ATA port to which SCSI device is attached
 *
 *	RETURNS:
 *	Zero.
 */

int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
{
	ata_scsi_sdev_config(sdev);
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Tejun Heo 已提交
3531
	ata_scsi_dev_config(sdev, ap->link.device);
3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542
	return 0;
}
EXPORT_SYMBOL_GPL(ata_sas_slave_configure);

/**
 *	ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
 *	@cmd: SCSI command to be sent
 *	@done: Completion function, called when command is complete
 *	@ap:	ATA port to which the command is being sent
 *
 *	RETURNS:
3543 3544
 *	Return value from __ata_scsi_queuecmd() if @cmd can be queued,
 *	0 otherwise.
3545 3546 3547 3548 3549
 */

int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
		     struct ata_port *ap)
{
3550 3551
	int rc = 0;

3552 3553
	ata_scsi_dump_cdb(ap, cmd);

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Tejun Heo 已提交
3554 3555
	if (likely(ata_scsi_dev_enabled(ap->link.device)))
		rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
3556 3557 3558 3559
	else {
		cmd->result = (DID_BAD_TARGET << 16);
		done(cmd);
	}
3560
	return rc;
3561 3562
}
EXPORT_SYMBOL_GPL(ata_sas_queuecmd);