libata-scsi.c 62.8 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_eh.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_request.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, const u8 *scsicmd);
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static struct ata_device *
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ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev);
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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


static const u8 def_rw_recovery_mpage[] = {
	RW_RECOVERY_MPAGE,
	RW_RECOVERY_MPAGE_LEN - 2,
	(1 << 7) |	/* AWRE, sat-r06 say it shall be 0 */
	    (1 << 6),	/* ARRE (auto read reallocation) */
	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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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_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];
	u8 args[4], *argbuf = NULL;
	int argsize = 0;
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	struct scsi_sense_hdr sshdr;
	enum dma_data_direction data_dir;
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	if (NULL == (void *)arg)
		return -EINVAL;

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

	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 */
		/* scsi_cmd[2] is already 0 -- no off.line, cc, 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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	if (scsi_execute_req(scsidev, scsi_cmd, data_dir, argbuf, argsize,
			     &sshdr, (10*HZ), 5)) {
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		rc = -EIO;
		goto error;
	}

	/* Need code to retrieve data from check condition? */

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

	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];
	u8 args[7];
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	struct scsi_sense_hdr sshdr;
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	if (NULL == (void *)arg)
		return -EINVAL;

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

	memset(scsi_cmd, 0, sizeof(scsi_cmd));
	scsi_cmd[0]  = ATA_16;
	scsi_cmd[1]  = (3 << 1); /* Non-data */
	/* scsi_cmd[2] is already 0 -- no off.line, cc, or data xfer */
	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];
	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... */	
	if (scsi_execute_req(scsidev, scsi_cmd, DMA_NONE, NULL, 0, &sshdr,
			     (10*HZ), 5))
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		rc = -EIO;

	/* Need code to retrieve data from check condition? */
	return rc;
}

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

	ap = (struct ata_port *) &scsidev->host->hostdata[0];
	if (!ap)
		goto out;

	dev = ata_scsi_find_dev(ap, scsidev);
	if (!dev) {
		rc = -ENODEV;
		goto out;
	}

	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_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;
	}

out:
	return rc;
}

/**
 *	ata_scsi_qc_new - acquire new ata_queued_cmd reference
 *	@ap: ATA port to which the new command is attached
 *	@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:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	Command allocated, or %NULL if none available.
 */
struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap,
				       struct ata_device *dev,
				       struct scsi_cmnd *cmd,
				       void (*done)(struct scsi_cmnd *))
{
	struct ata_queued_cmd *qc;

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

		if (cmd->use_sg) {
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			qc->__sg = (struct scatterlist *) cmd->request_buffer;
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			qc->n_elem = cmd->use_sg;
		} else {
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			qc->__sg = &qc->sgent;
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			qc->n_elem = 1;
		}
	} 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
 */
void ata_dump_status(unsigned id, struct ata_taskfile *tf)
{
	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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 *
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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:
 *	spin_lock_irqsave(host_set lock)
 */
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void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc, 
			u8 *ascq)
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{
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	int i;
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	/* Based on the 3ware driver translation table */
	static unsigned char sense_table[][4] = {
		/* 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
	};
	static unsigned char stat_table[][4] = {
		/* 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
	 */
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	if (drv_stat & ATA_BUSY) {
		drv_err = 0;	/* Ignore the err bits, they're invalid */
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	}
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	if (drv_err) {
		/* Look for drv_err */
		for (i = 0; sense_table[i][0] != 0xFF; i++) {
			/* Look for best matches first */
			if ((sense_table[i][0] & drv_err) == 
			    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 */
		printk(KERN_WARNING "ata%u: no sense translation for "
		       "error 0x%02x\n", id, drv_err);
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	}
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	/* 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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		}
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	}
	/* No error?  Undecoded? */
	printk(KERN_WARNING "ata%u: no sense translation for status: 0x%02x\n", 
	       id, drv_stat);
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	/* For our last chance pick, use medium read error because
	 * it's much more common than an ATA drive telling you a write
	 * has failed.
	 */
	*sk = MEDIUM_ERROR;
	*asc = 0x11; /* "unrecovered read error" */
	*ascq = 0x04; /*  "auto-reallocation failed" */

 translate_done:
	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);
	return;
}

/*
 *	ata_gen_ata_desc_sense - Generate check condition sense block.
 *	@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:
 *	spin_lock_irqsave(host_set lock)
 */
void ata_gen_ata_desc_sense(struct ata_queued_cmd *qc)
{
	struct scsi_cmnd *cmd = qc->scsicmd;
	struct ata_taskfile *tf = &qc->tf;
	unsigned char *sb = cmd->sense_buffer;
	unsigned char *desc = sb + 8;

	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);

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	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
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	/*
	 * Read the controller registers.
	 */
	assert(NULL != qc->ap->ops->tf_read);
	qc->ap->ops->tf_read(qc->ap, tf);
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	/*
	 * Use ata_to_sense_error() to map status register bits
	 * onto sense key, asc & ascq.
	 */
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	if (tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
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		ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
				   &sb[1], &sb[2], &sb[3]);
		sb[1] &= 0x0f;
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	}

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	/*
	 * Sense data is current and format is descriptor.
	 */
	sb[0] = 0x72;
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	desc[0] = 0x09;

	/*
	 * Set length of additional sense data.
	 * Since we only populate descriptor 0, the total
	 * length is the same (fixed) length as descriptor 0.
	 */
	desc[1] = sb[7] = 14;

	/*
	 * 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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	}
590
}
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592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609
/**
 *	ata_gen_fixed_sense - generate a SCSI fixed sense block
 *	@qc: Command that we are erroring out
 *
 *	Leverage ata_to_sense_error() to give us the codes.  Fit our
 *	LBA in here if there's room.
 *
 *	LOCKING:
 *	inherited from caller
 */
void ata_gen_fixed_sense(struct ata_queued_cmd *qc)
{
	struct scsi_cmnd *cmd = qc->scsicmd;
	struct ata_taskfile *tf = &qc->tf;
	unsigned char *sb = cmd->sense_buffer;

	memset(sb, 0, SCSI_SENSE_BUFFERSIZE);

610
	cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
611 612 613 614 615 616 617 618 619 620 621

	/*
	 * Read the controller registers.
	 */
	assert(NULL != qc->ap->ops->tf_read);
	qc->ap->ops->tf_read(qc->ap, tf);

	/*
	 * Use ata_to_sense_error() to map status register bits
	 * onto sense key, asc & ascq.
	 */
622
	if (tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
623 624 625
		ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
				   &sb[2], &sb[12], &sb[13]);
		sb[2] &= 0x0f;
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	}

	sb[0] = 0x70;
629
	sb[7] = 0x0a;
630

631 632 633 634 635
	if (tf->flags & ATA_TFLAG_LBA48) {
		/* TODO: find solution for LBA48 descriptors */
	}

	else if (tf->flags & ATA_TFLAG_LBA) {
636 637 638 639 640 641
		/* A small (28b) LBA will fit in the 32b info field */
		sb[0] |= 0x80;		/* set valid bit */
		sb[3] = tf->device & 0x0f;
		sb[4] = tf->lbah;
		sb[5] = tf->lbam;
		sb[6] = tf->lbal;
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	}
643 644 645 646

	else {
		/* TODO: C/H/S */
	}
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}

/**
 *	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)
{
	sdev->use_10_for_rw = 1;
	sdev->use_10_for_ms = 1;

	blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);

	if (sdev->id < ATA_MAX_DEVICES) {
		struct ata_port *ap;
		struct ata_device *dev;

		ap = (struct ata_port *) &sdev->host->hostdata[0];
		dev = &ap->device[sdev->id];

		/* TODO: 1024 is an arbitrary number, not the
		 * hardware maximum.  This should be increased to
		 * 65534 when Jens Axboe's patch for dynamically
		 * determining max_sectors is merged.
		 */
		if ((dev->flags & ATA_DFLAG_LBA48) &&
		    ((dev->flags & ATA_DFLAG_LOCK_SECTORS) == 0)) {
682 683 684 685
			/*
			 * do not overwrite sdev->host->max_sectors, since
			 * other drives on this host may not support LBA48
			 */
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			blk_queue_max_sectors(sdev->request_queue, 2048);
		}
688 689 690 691 692 693 694 695 696 697

		/*
		 * SATA DMA transfers must be multiples of 4 byte, so
		 * we need to pad ATAPI transfers using an extra sg.
		 * Decrement max hw segments accordingly.
		 */
		if (dev->class == ATA_DEV_ATAPI) {
			request_queue_t *q = sdev->request_queue;
			blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
		}
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	}

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

/**
 *	ata_scsi_error - SCSI layer error handler callback
 *	@host: SCSI host on which error occurred
 *
 *	Handles SCSI-layer-thrown error events.
 *
 *	LOCKING:
 *	Inherited from SCSI layer (none, can sleep)
 *
 *	RETURNS:
 *	Zero.
 */

int ata_scsi_error(struct Scsi_Host *host)
{
	struct ata_port *ap;

	DPRINTK("ENTER\n");

	ap = (struct ata_port *) &host->hostdata[0];
	ap->ops->eng_timeout(ap);

	/* TODO: this is per-command; when queueing is supported
	 * this code will either change or move to a more
	 * appropriate place
	 */
	host->host_failed--;
730
	INIT_LIST_HEAD(&host->eh_cmd_q);
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	DPRINTK("EXIT\n");
	return 0;
}

736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
/**
 *	ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
 *	@qc: Storage for translated ATA taskfile
 *	@scsicmd: SCSI command to translate
 *
 *	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:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */

static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
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					     const u8 *scsicmd)
755 756 757 758 759 760 761 762 763
{
	struct ata_taskfile *tf = &qc->tf;

	tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
	tf->protocol = ATA_PROT_NODATA;
	if (scsicmd[1] & 0x1) {
		;	/* ignore IMMED bit, violates sat-r05 */
	}
	if (scsicmd[4] & 0x2)
764
		goto invalid_fld;       /* LOEJ bit set not supported */
765
	if (((scsicmd[4] >> 4) & 0xf) != 0)
766
		goto invalid_fld;       /* power conditions not supported */
767 768
	if (scsicmd[4] & 0x1) {
		tf->nsect = 1;	/* 1 sector, lba=0 */
769 770 771 772 773 774 775 776 777 778 779 780 781 782 783

		if (qc->dev->flags & ATA_DFLAG_LBA) {
			qc->tf.flags |= ATA_TFLAG_LBA;

			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 */
		}

784 785 786 787 788 789 790 791 792 793 794 795 796 797
		tf->command = ATA_CMD_VERIFY;	/* READ VERIFY */
	} else {
		tf->nsect = 0;	/* time period value (0 implies now) */
		tf->command = ATA_CMD_STANDBY;
		/* Consider: ATA STANDBY IMMEDIATE command */
	}
	/*
	 * 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;
798 799 800 801 802

invalid_fld:
	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
	/* "Invalid field in cbd" */
	return 1;
803 804 805
}


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/**
 *	ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
 *	@qc: Storage for translated ATA taskfile
 *	@scsicmd: SCSI command to translate (ignored)
 *
 *	Sets up an ATA taskfile to issue FLUSH CACHE or
 *	FLUSH CACHE EXT.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */

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static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
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{
	struct ata_taskfile *tf = &qc->tf;

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

828
	if ((qc->dev->flags & ATA_DFLAG_LBA48) &&
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	    (ata_id_has_flush_ext(qc->dev->id)))
		tf->command = ATA_CMD_FLUSH_EXT;
	else
		tf->command = ATA_CMD_FLUSH;

	return 0;
}

837 838 839 840 841 842 843 844 845 846 847
/**
 *	scsi_6_lba_len - Get LBA and transfer length
 *	@scsicmd: SCSI command to translate
 *
 *	Calculate LBA and transfer length for 6-byte commands.
 *
 *	RETURNS:
 *	@plba: the LBA
 *	@plen: the transfer length
 */

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static void scsi_6_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874
{
	u64 lba = 0;
	u32 len = 0;

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

	lba |= ((u64)scsicmd[2]) << 8;
	lba |= ((u64)scsicmd[3]);

	len |= ((u32)scsicmd[4]);

	*plba = lba;
	*plen = len;
}

/**
 *	scsi_10_lba_len - Get LBA and transfer length
 *	@scsicmd: SCSI command to translate
 *
 *	Calculate LBA and transfer length for 10-byte commands.
 *
 *	RETURNS:
 *	@plba: the LBA
 *	@plen: the transfer length
 */

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static void scsi_10_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
{
	u64 lba = 0;
	u32 len = 0;

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

	lba |= ((u64)scsicmd[2]) << 24;
	lba |= ((u64)scsicmd[3]) << 16;
	lba |= ((u64)scsicmd[4]) << 8;
	lba |= ((u64)scsicmd[5]);

	len |= ((u32)scsicmd[7]) << 8;
	len |= ((u32)scsicmd[8]);

	*plba = lba;
	*plen = len;
}

/**
 *	scsi_16_lba_len - Get LBA and transfer length
 *	@scsicmd: SCSI command to translate
 *
 *	Calculate LBA and transfer length for 16-byte commands.
 *
 *	RETURNS:
 *	@plba: the LBA
 *	@plen: the transfer length
 */

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static void scsi_16_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
{
	u64 lba = 0;
	u32 len = 0;

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

	lba |= ((u64)scsicmd[2]) << 56;
	lba |= ((u64)scsicmd[3]) << 48;
	lba |= ((u64)scsicmd[4]) << 40;
	lba |= ((u64)scsicmd[5]) << 32;
	lba |= ((u64)scsicmd[6]) << 24;
	lba |= ((u64)scsicmd[7]) << 16;
	lba |= ((u64)scsicmd[8]) << 8;
	lba |= ((u64)scsicmd[9]);

	len |= ((u32)scsicmd[10]) << 24;
	len |= ((u32)scsicmd[11]) << 16;
	len |= ((u32)scsicmd[12]) << 8;
	len |= ((u32)scsicmd[13]);

	*plba = lba;
	*plen = len;
}

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/**
 *	ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
 *	@qc: Storage for translated ATA taskfile
 *	@scsicmd: SCSI command to translate
 *
 *	Converts SCSI VERIFY command to an ATA READ VERIFY command.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */

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static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
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{
	struct ata_taskfile *tf = &qc->tf;
947
	struct ata_device *dev = qc->dev;
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	u64 dev_sectors = qc->dev->n_sectors;
949 950
	u64 block;
	u32 n_block;
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	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
	tf->protocol = ATA_PROT_NODATA;

955 956 957 958
	if (scsicmd[0] == VERIFY)
		scsi_10_lba_len(scsicmd, &block, &n_block);
	else if (scsicmd[0] == VERIFY_16)
		scsi_16_lba_len(scsicmd, &block, &n_block);
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	else
960
		goto invalid_fld;
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961

962
	if (!n_block)
963
		goto nothing_to_do;
964
	if (block >= dev_sectors)
965
		goto out_of_range;
966
	if ((block + n_block) > dev_sectors)
967
		goto out_of_range;
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968

969 970 971 972 973 974 975 976 977
	if (dev->flags & ATA_DFLAG_LBA) {
		tf->flags |= ATA_TFLAG_LBA;

		if (dev->flags & ATA_DFLAG_LBA48) {
			if (n_block > (64 * 1024))
				goto invalid_fld;

			/* use LBA48 */
			tf->flags |= ATA_TFLAG_LBA48;
978
			tf->command = ATA_CMD_VERIFY_EXT;
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980
			tf->hob_nsect = (n_block >> 8) & 0xff;
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982 983 984 985
			tf->hob_lbah = (block >> 40) & 0xff;
			tf->hob_lbam = (block >> 32) & 0xff;
			tf->hob_lbal = (block >> 24) & 0xff;
		} else {
986 987 988 989
			if (n_block > 256)
				goto invalid_fld;

			/* use LBA28 */
990
			tf->command = ATA_CMD_VERIFY;
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991

992 993
			tf->device |= (block >> 24) & 0xf;
		}
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995
		tf->nsect = n_block & 0xff;
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997 998 999
		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;
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1001
		tf->device |= ATA_LBA;
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	} else {
1003 1004 1005
		/* CHS */
		u32 sect, head, cyl, track;

1006 1007 1008
		if (n_block > 256)
			goto invalid_fld;

1009 1010 1011 1012 1013 1014
		/* Convert LBA to CHS */
		track = (u32)block / dev->sectors;
		cyl   = track / dev->heads;
		head  = track % dev->heads;
		sect  = (u32)block % dev->sectors + 1;

1015 1016
		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
			(u32)block, track, cyl, head, sect);
1017 1018 1019 1020 1021 1022
		
		/* Check whether the converted CHS can fit. 
		   Cylinder: 0-65535 
		   Head: 0-15
		   Sector: 1-255*/
		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect)) 
1023
			goto out_of_range;
1024
		
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		tf->command = ATA_CMD_VERIFY;
1026 1027 1028 1029 1030
		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
		tf->lbal = sect;
		tf->lbam = cyl;
		tf->lbah = cyl >> 8;
		tf->device |= head;
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	}

	return 0;

1035 1036 1037 1038
invalid_fld:
	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
	/* "Invalid field in cbd" */
	return 1;
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1040 1041 1042 1043 1044 1045 1046 1047
out_of_range:
	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
	/* "Logical Block Address out of range" */
	return 1;

nothing_to_do:
	qc->scsicmd->result = SAM_STAT_GOOD;
	return 1;
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}

/**
 *	ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
 *	@qc: Storage for translated ATA taskfile
 *	@scsicmd: SCSI command to translate
 *
 *	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:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	Zero on success, non-zero on error.
 */

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static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
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{
	struct ata_taskfile *tf = &qc->tf;
1073
	struct ata_device *dev = qc->dev;
1074 1075
	u64 block;
	u32 n_block;
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	tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;

1079 1080
	if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||
	    scsicmd[0] == WRITE_16)
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		tf->flags |= ATA_TFLAG_WRITE;

1083
	/* Calculate the SCSI LBA and transfer length. */
1084 1085 1086 1087 1088 1089 1090 1091
	switch (scsicmd[0]) {
	case READ_10:
	case WRITE_10:
		scsi_10_lba_len(scsicmd, &block, &n_block);
		break;
	case READ_6:
	case WRITE_6:
		scsi_6_lba_len(scsicmd, &block, &n_block);
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1093 1094 1095
		/* for 6-byte r/w commands, transfer length 0
		 * means 256 blocks of data, not 0 block.
		 */
1096 1097
		if (!n_block)
			n_block = 256;
1098 1099 1100 1101 1102 1103
		break;
	case READ_16:
	case WRITE_16:
		scsi_16_lba_len(scsicmd, &block, &n_block);
		break;
	default:
1104
		DPRINTK("no-byte command\n");
1105
		goto invalid_fld;
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	}

1108 1109
	/* Check and compose ATA command */
	if (!n_block)
1110 1111 1112 1113
		/* 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
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1114 1115
		 *
		 * WARNING: one or two older ATA drives treat 0 as 0...
1116
		 */
1117
		goto nothing_to_do;
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1119 1120 1121 1122
	if (dev->flags & ATA_DFLAG_LBA) {
		tf->flags |= ATA_TFLAG_LBA;

		if (dev->flags & ATA_DFLAG_LBA48) {
1123 1124
			/* The request -may- be too large for LBA48. */
			if ((block >> 48) || (n_block > 65536))
1125
				goto out_of_range;
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1127 1128 1129
			/* use LBA48 */
			tf->flags |= ATA_TFLAG_LBA48;

1130
			tf->hob_nsect = (n_block >> 8) & 0xff;
1131

1132 1133 1134 1135
			tf->hob_lbah = (block >> 40) & 0xff;
			tf->hob_lbam = (block >> 32) & 0xff;
			tf->hob_lbal = (block >> 24) & 0xff;
		} else { 
1136
			/* use LBA28 */
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1138 1139
			/* The request -may- be too large for LBA28. */
			if ((block >> 28) || (n_block > 256))
1140
				goto out_of_range;
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1142
			tf->device |= (block >> 24) & 0xf;
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1143 1144
		}

1145 1146
		ata_rwcmd_protocol(qc);

1147 1148
		qc->nsect = n_block;
		tf->nsect = n_block & 0xff;
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1150 1151 1152
		tf->lbah = (block >> 16) & 0xff;
		tf->lbam = (block >> 8) & 0xff;
		tf->lbal = block & 0xff;
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1154 1155 1156 1157 1158 1159 1160
		tf->device |= ATA_LBA;
	} else { 
		/* CHS */
		u32 sect, head, cyl, track;

		/* The request -may- be too large for CHS addressing. */
		if ((block >> 28) || (n_block > 256))
1161
			goto out_of_range;
1162

1163 1164
		ata_rwcmd_protocol(qc);

1165 1166 1167 1168 1169 1170
		/* Convert LBA to CHS */
		track = (u32)block / dev->sectors;
		cyl   = track / dev->heads;
		head  = track % dev->heads;
		sect  = (u32)block % dev->sectors + 1;

1171
		DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1172
			(u32)block, track, cyl, head, sect);
1173

1174 1175 1176 1177
		/* Check whether the converted CHS can fit. 
		   Cylinder: 0-65535 
		   Head: 0-15
		   Sector: 1-255*/
1178
		if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1179
			goto out_of_range;
1180

1181 1182 1183 1184 1185 1186
		qc->nsect = n_block;
		tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
		tf->lbal = sect;
		tf->lbam = cyl;
		tf->lbah = cyl >> 8;
		tf->device |= head;
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	}

1189
	return 0;
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invalid_fld:
	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
	/* "Invalid field in cbd" */
	return 1;
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out_of_range:
	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
	/* "Logical Block Address out of range" */
	return 1;
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nothing_to_do:
	qc->scsicmd->result = SAM_STAT_GOOD;
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	return 1;
}

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static int ata_scsi_qc_complete(struct ata_queued_cmd *qc,
				unsigned int err_mask)
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{
	struct scsi_cmnd *cmd = qc->scsicmd;
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	u8 *cdb = cmd->cmnd;
 	int need_sense = (err_mask != 0);
1212 1213 1214 1215 1216 1217 1218 1219

	/* 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.
	 */
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	if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
 	    ((cdb[2] & 0x20) || need_sense)) {
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 		ata_gen_ata_desc_sense(qc);
	} 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.
			 */
			ata_gen_fixed_sense(qc);
		}
	}
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	if (need_sense) {
		/* The ata_gen_..._sense routines fill in tf */
		ata_dump_status(qc->ap->id, &qc->tf);
	}
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	qc->scsidone(cmd);

	return 0;
}

/**
 *	ata_scsi_translate - Translate then issue SCSI command to ATA device
 *	@ap: ATA port to which the command is addressed
 *	@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.
 *
1262 1263 1264 1265 1266 1267
 *	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.
 *
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 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

static void ata_scsi_translate(struct ata_port *ap, struct ata_device *dev,
			      struct scsi_cmnd *cmd,
			      void (*done)(struct scsi_cmnd *),
			      ata_xlat_func_t xlat_func)
{
	struct ata_queued_cmd *qc;
	u8 *scsicmd = cmd->cmnd;

	VPRINTK("ENTER\n");

	qc = ata_scsi_qc_new(ap, dev, cmd, done);
	if (!qc)
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		goto err_mem;
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	/* data is present; dma-map it */
1287 1288
	if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
	    cmd->sc_data_direction == DMA_TO_DEVICE) {
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		if (unlikely(cmd->request_bufflen < 1)) {
			printk(KERN_WARNING "ata%u(%u): WARNING: zero len r/w req\n",
			       ap->id, dev->devno);
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			goto err_did;
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		}

		if (cmd->use_sg)
			ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
		else
			ata_sg_init_one(qc, cmd->request_buffer,
					cmd->request_bufflen);

		qc->dma_dir = cmd->sc_data_direction;
	}

	qc->complete_fn = ata_scsi_qc_complete;

	if (xlat_func(qc, scsicmd))
1307
		goto early_finish;
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	/* select device, send command to hardware */
	if (ata_qc_issue(qc))
1311
		goto err_did;
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	VPRINTK("EXIT\n");
	return;

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early_finish:
        ata_qc_free(qc);
	done(cmd);
	DPRINTK("EXIT - early finish (good or error)\n");
	return;

err_did:
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	ata_qc_free(qc);
1324 1325 1326 1327 1328
err_mem:
	cmd->result = (DID_ERROR << 16);
	done(cmd);
	DPRINTK("EXIT - internal\n");
	return;
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}

/**
 *	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:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	Length of response buffer.
 */

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

	if (cmd->use_sg) {
		struct scatterlist *sg;

		sg = (struct scatterlist *) cmd->request_buffer;
		buf = kmap_atomic(sg->page, KM_USER0) + sg->offset;
		buflen = sg->length;
	} else {
		buf = cmd->request_buffer;
		buflen = cmd->request_bufflen;
	}

	*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:
 *	spin_lock_irqsave(host_set lock)
 */

static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
{
	if (cmd->use_sg) {
		struct scatterlist *sg;

		sg = (struct scatterlist *) cmd->request_buffer;
		kunmap_atomic(buf - sg->offset, KM_USER0);
	}
}

/**
 *	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
1395 1396
 *	completed successfully (0), or not (in which case cmd->result
 *	and sense buffer are assumed to be set).
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 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

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);

1415
	if (rc == 0)
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		cmd->result = SAM_STAT_GOOD;
1417
	args->done(cmd);
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}

/**
 *	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
 *	with non-EVPD INQUIRY command output.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

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);
		ata_dev_id_string(args->id, &rbuf[16], ATA_ID_PROD_OFS, 16);
		ata_dev_id_string(args->id, &rbuf[32], ATA_ID_FW_REV_OFS, 4);
		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;
}

/**
 *	ata_scsiop_inq_00 - Simulate INQUIRY EVPD page 0, list of pages
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
 *	Returns list of inquiry EVPD pages available.
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

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 */
	};
	rbuf[3] = sizeof(pages);	/* number of supported EVPD pages */

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

	return 0;
}

/**
 *	ata_scsiop_inq_80 - Simulate INQUIRY EVPD page 80, device serial number
 *	@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:
 *	spin_lock_irqsave(host_set lock)
 */

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,
		ATA_SERNO_LEN,		/* page len */
	};
	memcpy(rbuf, hdr, sizeof(hdr));

	if (buflen > (ATA_SERNO_LEN + 4 - 1))
		ata_dev_id_string(args->id, (unsigned char *) &rbuf[4],
				  ATA_ID_SERNO_OFS, ATA_SERNO_LEN);

	return 0;
}

static const char *inq_83_str = "Linux ATA-SCSI simulator";

/**
 *	ata_scsiop_inq_83 - Simulate INQUIRY EVPD page 83, device identity
 *	@args: device IDENTIFY data / SCSI command of interest.
 *	@rbuf: Response buffer, to which simulated SCSI cmd output is sent.
 *	@buflen: Response buffer length.
 *
 *	Returns device identification.  Currently hardcoded to
 *	return "Linux ATA-SCSI simulator".
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
			      unsigned int buflen)
{
	rbuf[1] = 0x83;			/* this page code */
	rbuf[3] = 4 + strlen(inq_83_str);	/* page len */

	/* our one and only identification descriptor (vendor-specific) */
	if (buflen > (strlen(inq_83_str) + 4 + 4 - 1)) {
		rbuf[4 + 0] = 2;	/* code set: ASCII */
		rbuf[4 + 3] = strlen(inq_83_str);
		memcpy(rbuf + 4 + 4, inq_83_str, strlen(inq_83_str));
	}

	return 0;
}

/**
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 *	ata_scsiop_noop - Command handler that simply returns success.
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 *	@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:
 *	spin_lock_irqsave(host_set lock)
 */

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)
{
1631
	u8 page[CACHE_MPAGE_LEN];
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1633
	memcpy(page, def_cache_mpage, sizeof(page));
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	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)
{
1657 1658 1659
	ata_msense_push(ptr_io, last, def_control_mpage,
			sizeof(def_control_mpage));
	return sizeof(def_control_mpage);
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}

/**
 *	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)
{

1677 1678 1679
	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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}

/**
 *	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.
 *
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 *	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.
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 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 */

unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
				  unsigned int buflen)
{
	u8 *scsicmd = args->cmd->cmnd, *p, *last;
1700 1701 1702 1703 1704 1705 1706
	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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	VPRINTK("ENTER\n");

	six_byte = (scsicmd[0] == MODE_SENSE);
1711 1712 1713
	ebd = !(scsicmd[1] & 0x8);      /* dbd bit inverted == edb */
	/*
	 * LLBA bit in msense(10) ignored (compliant)
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	 */
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	page_control = scsicmd[2] >> 6;
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	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;
	}
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	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;
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	p = rbuf + output_len;
1738
	last = rbuf + minlen - 1;
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	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;
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	switch(pg) {
	case RW_RECOVERY_MPAGE:
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		output_len += ata_msense_rw_recovery(&p, last);
		break;

1754
	case CACHE_MPAGE:
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		output_len += ata_msense_caching(args->id, &p, last);
		break;

1758
	case CONTROL_MPAGE: {
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		output_len += ata_msense_ctl_mode(&p, last);
		break;
		}

1763
	case ALL_MPAGES:
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		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 */
1770
		goto invalid_fld;
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	}

1773 1774
	if (minlen < 1)
		return 0;
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	if (six_byte) {
		output_len--;
		rbuf[0] = output_len;
1778 1779 1780 1781 1782 1783 1784
		if (ebd) {
			if (minlen > 3)
				rbuf[3] = sizeof(sat_blk_desc);
			if (minlen > 11)
				memcpy(rbuf + 4, sat_blk_desc,
				       sizeof(sat_blk_desc));
		}
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	} else {
		output_len -= 2;
		rbuf[0] = output_len >> 8;
1788 1789 1790 1791 1792 1793 1794 1795 1796
		if (minlen > 1)
			rbuf[1] = output_len;
		if (ebd) {
			if (minlen > 7)
				rbuf[7] = sizeof(sat_blk_desc);
			if (minlen > 15)
				memcpy(rbuf + 8, sat_blk_desc,
				       sizeof(sat_blk_desc));
		}
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	}
	return 0;
1799 1800 1801 1802 1803 1804 1805 1806 1807 1808

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;
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}

/**
 *	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:
 *	spin_lock_irqsave(host_set lock)
 */

unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
			        unsigned int buflen)
{
	u64 n_sectors;
	u32 tmp;

	VPRINTK("ENTER\n");

1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844
	if (ata_id_has_lba(args->id)) {
		if (ata_id_has_lba48(args->id))
			n_sectors = ata_id_u64(args->id, 100);
		else
			n_sectors = ata_id_u32(args->id, 60);
	} else {
		/* CHS default translation */
		n_sectors = args->id[1] * args->id[3] * args->id[6];

		if (ata_id_current_chs_valid(args->id))
			/* CHS current translation */
			n_sectors = ata_id_u32(args->id, 57);
	}

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	n_sectors--;		/* ATA TotalUserSectors - 1 */

	if (args->cmd->cmnd[0] == READ_CAPACITY) {
1848 1849 1850 1851 1852
		if( n_sectors >= 0xffffffffULL )
			tmp = 0xffffffff ;  /* Return max count on overflow */
		else
			tmp = n_sectors ;

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		/* sector count, 32-bit */
		rbuf[0] = tmp >> (8 * 3);
		rbuf[1] = tmp >> (8 * 2);
		rbuf[2] = tmp >> (8 * 1);
		rbuf[3] = tmp;

		/* sector size */
		tmp = ATA_SECT_SIZE;
		rbuf[6] = tmp >> 8;
		rbuf[7] = tmp;

	} else {
		/* sector count, 64-bit */
1866 1867 1868 1869 1870 1871
		tmp = n_sectors >> (8 * 4);
		rbuf[2] = tmp >> (8 * 3);
		rbuf[3] = tmp >> (8 * 2);
		rbuf[4] = tmp >> (8 * 1);
		rbuf[5] = tmp;
		tmp = n_sectors;
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		rbuf[6] = tmp >> (8 * 3);
		rbuf[7] = tmp >> (8 * 2);
		rbuf[8] = tmp >> (8 * 1);
		rbuf[9] = tmp;

		/* sector size */
		tmp = ATA_SECT_SIZE;
		rbuf[12] = tmp >> 8;
		rbuf[13] = tmp;
	}

	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:
 *	spin_lock_irqsave(host_set lock)
 */

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;
}

1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934
/**
 *	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;
}

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1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952
/**
 *	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:
 *	spin_lock_irqsave(host_set lock)
 */

void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
{
	DPRINTK("ENTER\n");
1953
	ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
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	done(cmd);
}

1958
static int atapi_sense_complete(struct ata_queued_cmd *qc,unsigned int err_mask)
1959
{
1960 1961 1962 1963 1964 1965 1966
	if (err_mask && ((err_mask & AC_ERR_DEV) == 0))
		/* 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
		 */
		ata_gen_ata_desc_sense(qc);
1967

1968 1969 1970
	qc->scsidone(qc->scsicmd);
	return 0;
}
1971

1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983
/* 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");
1984 1985 1986 1987

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

1988 1989 1990 1991 1992 1993 1994 1995
	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);

1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
	ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
	qc->dma_dir = DMA_FROM_DEVICE;

	memset(&qc->cdb, 0, ap->cdb_len);
	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;

2006 2007 2008 2009 2010 2011 2012 2013
	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;
		qc->tf.lbam = (8 * 1024) & 0xff;
		qc->tf.lbah = (8 * 1024) >> 8;
	}
2014 2015
	qc->nbytes = SCSI_SENSE_BUFFERSIZE;

2016
	qc->complete_fn = atapi_sense_complete;
2017

2018 2019
	if (ata_qc_issue(qc))
		ata_qc_complete(qc, AC_ERR_OTHER);
2020 2021 2022 2023

	DPRINTK("EXIT\n");
}

2024
static int atapi_qc_complete(struct ata_queued_cmd *qc, unsigned int err_mask)
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Linus Torvalds 已提交
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{
	struct scsi_cmnd *cmd = qc->scsicmd;

2028
	VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
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Jeff Garzik 已提交
2029

2030
	if (unlikely(err_mask & AC_ERR_DEV)) {
L
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2031
		cmd->result = SAM_STAT_CHECK_CONDITION;
2032
		atapi_request_sense(qc);
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Linus Torvalds 已提交
2033
		return 1;
J
Jeff Garzik 已提交
2034 2035
	}

2036 2037 2038 2039 2040 2041 2042 2043
	else if (unlikely(err_mask))
		/* 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
		 */
		ata_gen_ata_desc_sense(qc);

J
Jeff Garzik 已提交
2044
	else {
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2045 2046 2047 2048 2049 2050 2051
		u8 *scsicmd = cmd->cmnd;

		if (scsicmd[0] == INQUIRY) {
			u8 *buf = NULL;
			unsigned int buflen;

			buflen = ata_scsi_rbuf_get(cmd, &buf);
2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068

	/* 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.
	 */
	/* FIXME: do we ever override EVPD pages and the like, with
	 * this code?
	 */
			if (buf[2] == 0) {
				buf[2] = 0x5;
				buf[3] = 0x32;
			}

L
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2069 2070
			ata_scsi_rbuf_put(cmd, buf);
		}
2071

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2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089
		cmd->result = SAM_STAT_GOOD;
	}

	qc->scsidone(cmd);
	return 0;
}
/**
 *	atapi_xlat - Initialize PACKET taskfile
 *	@qc: command structure to be initialized
 *	@scsicmd: SCSI CDB associated with this PACKET command
 *
 *	LOCKING:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	Zero on success, non-zero on failure.
 */

J
Jeff Garzik 已提交
2090
static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
L
Linus Torvalds 已提交
2091 2092 2093 2094
{
	struct scsi_cmnd *cmd = qc->scsicmd;
	struct ata_device *dev = qc->dev;
	int using_pio = (dev->flags & ATA_DFLAG_PIO);
2095
	int nodata = (cmd->sc_data_direction == DMA_NONE);
L
Linus Torvalds 已提交
2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106

	if (!using_pio)
		/* Check whether ATAPI DMA is safe */
		if (ata_check_atapi_dma(qc))
			using_pio = 1;

	memcpy(&qc->cdb, scsicmd, qc->ap->cdb_len);

	qc->complete_fn = atapi_qc_complete;

	qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2107
	if (cmd->sc_data_direction == DMA_TO_DEVICE) {
L
Linus Torvalds 已提交
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130
		qc->tf.flags |= ATA_TFLAG_WRITE;
		DPRINTK("direction: write\n");
	}

	qc->tf.command = ATA_CMD_PACKET;

	/* no data, or PIO data xfer */
	if (using_pio || nodata) {
		if (nodata)
			qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
		else
			qc->tf.protocol = ATA_PROT_ATAPI;
		qc->tf.lbam = (8 * 1024) & 0xff;
		qc->tf.lbah = (8 * 1024) >> 8;
	}

	/* DMA data xfer */
	else {
		qc->tf.protocol = ATA_PROT_ATAPI_DMA;
		qc->tf.feature |= ATAPI_PKT_DMA;

#ifdef ATAPI_ENABLE_DMADIR
		/* some SATA bridges need us to indicate data xfer direction */
2131
		if (cmd->sc_data_direction != DMA_TO_DEVICE)
L
Linus Torvalds 已提交
2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158
			qc->tf.feature |= ATAPI_DMADIR;
#endif
	}

	qc->nbytes = cmd->bufflen;

	return 0;
}

/**
 *	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:
 *	spin_lock_irqsave(host_set lock)
 *
 *	RETURNS:
 *	Associated ATA device, or %NULL if not found.
 */

static struct ata_device *
J
Jeff Garzik 已提交
2159
ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
L
Linus Torvalds 已提交
2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175
{
	struct ata_device *dev;

	/* skip commands not addressed to targets we simulate */
	if (likely(scsidev->id < ATA_MAX_DEVICES))
		dev = &ap->device[scsidev->id];
	else
		return NULL;

	if (unlikely((scsidev->channel != 0) ||
		     (scsidev->lun != 0)))
		return NULL;

	if (unlikely(!ata_dev_present(dev)))
		return NULL;

J
Jeff Garzik 已提交
2176
	if (!atapi_enabled) {
2177 2178 2179
		if (unlikely(dev->class == ATA_DEV_ATAPI))
			return NULL;
	}
L
Linus Torvalds 已提交
2180 2181 2182 2183

	return dev;
}

2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 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
/*
 *	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 */
			return ATA_PROT_DMA;

		case 4:		/* PIO Data-in */
		case 5:		/* PIO Data-out */
			if (byte1 & 0xe0) {
				return ATA_PROT_PIO_MULT;
			}
			return ATA_PROT_PIO;

		case 10:	/* Device Reset */
		case 0:		/* Hard Reset */
		case 1:		/* SRST */
		case 2:		/* Bus Idle */
		case 7:		/* Packet */
		case 8:		/* DMA Queued */
		case 9:		/* Device Diagnostic */
		case 11:	/* UDMA Data-in */
		case 12:	/* UDMA Data-Out */
		case 13:	/* FPDMA */
		default:	/* Reserved */
			break;
	}

	return ATA_PROT_UNKNOWN;
}

/**
 *	ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
 *	@qc: command structure to be initialized
R
Randy Dunlap 已提交
2228
 *	@scsicmd: SCSI command to convert
2229 2230 2231 2232 2233 2234 2235
 *
 *	Handles either 12 or 16-byte versions of the CDB.
 *
 *	RETURNS:
 *	Zero on success, non-zero on failure.
 */
static unsigned int
2236
ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
2237 2238 2239 2240 2241
{
	struct ata_taskfile *tf = &(qc->tf);
	struct scsi_cmnd *cmd = qc->scsicmd;

	if ((tf->protocol = ata_scsi_map_proto(scsicmd[1])) == ATA_PROT_UNKNOWN)
2242
		goto invalid_fld;
2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287

	/*
	 * 12 and 16 byte CDBs use different offsets to
	 * provide the various register values.
	 */
	if (scsicmd[0] == ATA_16) {
		/*
		 * 16-byte CDB - may contain extended commands.
		 *
		 * If that is the case, copy the upper byte register values.
		 */
		if (scsicmd[1] & 0x01) {
			tf->hob_feature = scsicmd[3];
			tf->hob_nsect = scsicmd[5];
			tf->hob_lbal = scsicmd[7];
			tf->hob_lbam = scsicmd[9];
			tf->hob_lbah = scsicmd[11];
			tf->flags |= ATA_TFLAG_LBA48;
		} else
			tf->flags &= ~ATA_TFLAG_LBA48;

		/*
		 * Always copy low byte, device and command registers.
		 */
		tf->feature = scsicmd[4];
		tf->nsect = scsicmd[6];
		tf->lbal = scsicmd[8];
		tf->lbam = scsicmd[10];
		tf->lbah = scsicmd[12];
		tf->device = scsicmd[13];
		tf->command = scsicmd[14];
	} else {
		/*
		 * 12-byte CDB - incapable of extended commands.
		 */
		tf->flags &= ~ATA_TFLAG_LBA48;

		tf->feature = scsicmd[3];
		tf->nsect = scsicmd[4];
		tf->lbal = scsicmd[5];
		tf->lbam = scsicmd[6];
		tf->lbah = scsicmd[7];
		tf->device = scsicmd[8];
		tf->command = scsicmd[9];
	}
2288 2289 2290 2291 2292 2293
	/*
	 * If slave is possible, enforce correct master/slave bit
	*/
	if (qc->ap->flags & ATA_FLAG_SLAVE_POSS)
		tf->device = qc->dev->devno ?
			tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2294 2295 2296 2297 2298 2299 2300 2301 2302 2303

	/*
	 * 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))
2304
		goto invalid_fld;
2305 2306 2307 2308 2309 2310 2311 2312

	/*
	 * 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);

2313
	if (cmd->sc_data_direction == DMA_TO_DEVICE)
2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324
		tf->flags |= ATA_TFLAG_WRITE;

	/*
	 * Set transfer length.
	 *
	 * TODO: find out if we need to do more here to
	 *       cover scatter/gather case.
	 */
	qc->nsect = cmd->bufflen / ATA_SECT_SIZE;

	return 0;
2325 2326 2327 2328 2329

 invalid_fld:
	ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x00);
	/* "Invalid field in cdb" */
	return 1;
2330 2331
}

L
Linus Torvalds 已提交
2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363
/**
 *	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;
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	case ATA_12:
	case ATA_16:
		return ata_scsi_pass_thru;
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	case START_STOP:
		return ata_scsi_start_stop_xlat;
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	}

	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",
		ap->id,
		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
}

/**
 *	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:
 *	Releases scsi-layer-held lock, and obtains host_set lock.
 *
 *	RETURNS:
 *	Zero.
 */

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

	spin_unlock(shost->host_lock);
	spin_lock(&ap->host_set->lock);
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	ata_scsi_dump_cdb(ap, cmd);

	dev = ata_scsi_find_dev(ap, scsidev);
	if (unlikely(!dev)) {
		cmd->result = (DID_BAD_TARGET << 16);
		done(cmd);
		goto out_unlock;
	}

	if (dev->class == ATA_DEV_ATA) {
		ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
							      cmd->cmnd[0]);

		if (xlat_func)
			ata_scsi_translate(ap, dev, cmd, done, xlat_func);
		else
			ata_scsi_simulate(dev->id, cmd, done);
	} else
		ata_scsi_translate(ap, dev, cmd, done, atapi_xlat);

out_unlock:
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	spin_unlock(&ap->host_set->lock);
	spin_lock(shost->host_lock);
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	return 0;
}

/**
 *	ata_scsi_simulate - simulate SCSI command on ATA device
 *	@id: current IDENTIFY data for target device.
 *	@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:
 *	spin_lock_irqsave(host_set lock)
 */

void ata_scsi_simulate(u16 *id,
		      struct scsi_cmnd *cmd,
		      void (*done)(struct scsi_cmnd *))
{
	struct ata_scsi_args args;
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	const u8 *scsicmd = cmd->cmnd;
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	args.id = id;
	args.cmd = cmd;
	args.done = done;

	switch(scsicmd[0]) {
		/* no-op's, complete with success */
		case SYNCHRONIZE_CACHE:
		case REZERO_UNIT:
		case SEEK_6:
		case SEEK_10:
		case TEST_UNIT_READY:
		case FORMAT_UNIT:		/* FIXME: correct? */
		case SEND_DIAGNOSTIC:		/* FIXME: correct? */
			ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
			break;

		case INQUIRY:
			if (scsicmd[1] & 2)	           /* is CmdDt set?  */
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				ata_scsi_invalid_field(cmd, done);
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			else if ((scsicmd[1] & 1) == 0)    /* is EVPD clear? */
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
			else if (scsicmd[2] == 0x00)
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
			else if (scsicmd[2] == 0x80)
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
			else if (scsicmd[2] == 0x83)
				ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
			else
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				ata_scsi_invalid_field(cmd, done);
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			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 */
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			ata_scsi_invalid_field(cmd, done);
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			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
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				ata_scsi_invalid_field(cmd, done);
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			break;

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

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		/* mandatory commands we haven't implemented yet */
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		case REQUEST_SENSE:

		/* all other commands */
		default:
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			ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
			/* "Invalid command operation code" */
			done(cmd);
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			break;
	}
}

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void ata_scsi_scan_host(struct ata_port *ap)
{
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	struct ata_device *dev;
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	unsigned int i;

	if (ap->flags & ATA_FLAG_PORT_DISABLED)
		return;

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	for (i = 0; i < ATA_MAX_DEVICES; i++) {
		dev = &ap->device[i];

		if (ata_dev_present(dev))
			scsi_scan_target(&ap->host->shost_gendev, 0, i, 0, 0);
	}
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}