2 * libata-scsi.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from
31 * - http://www.t10.org/
32 * - http://www.t13.org/
36 #include <linux/kernel.h>
37 #include <linux/blkdev.h>
38 #include <linux/spinlock.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_eh.h>
43 #include <scsi/scsi_device.h>
44 #include <scsi/scsi_tcq.h>
45 #include <scsi/scsi_transport.h>
46 #include <linux/libata.h>
47 #include <linux/hdreg.h>
48 #include <asm/uaccess.h>
52 #define SECTOR_SIZE 512
54 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
56 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
57 const struct scsi_device *scsidev);
58 static struct ata_device * ata_scsi_find_dev(struct ata_port *ap,
59 const struct scsi_device *scsidev);
60 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
61 unsigned int id, unsigned int lun);
64 #define RW_RECOVERY_MPAGE 0x1
65 #define RW_RECOVERY_MPAGE_LEN 12
66 #define CACHE_MPAGE 0x8
67 #define CACHE_MPAGE_LEN 20
68 #define CONTROL_MPAGE 0xa
69 #define CONTROL_MPAGE_LEN 12
70 #define ALL_MPAGES 0x3f
71 #define ALL_SUB_MPAGES 0xff
74 static const u8 def_rw_recovery_mpage[] = {
76 RW_RECOVERY_MPAGE_LEN - 2,
77 (1 << 7) | /* AWRE, sat-r06 say it shall be 0 */
78 (1 << 6), /* ARRE (auto read reallocation) */
79 0, /* read retry count */
81 0, /* write retry count */
85 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
88 0, /* contains WCE, needs to be 0 for logic */
89 0, 0, 0, 0, 0, 0, 0, 0, 0,
90 0, /* contains DRA, needs to be 0 for logic */
94 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
96 CONTROL_MPAGE_LEN - 2,
97 2, /* DSENSE=0, GLTSD=1 */
98 0, /* [QAM+QERR may be 1, see 05-359r1] */
99 0, 0, 0, 0, 0xff, 0xff,
100 0, 30 /* extended self test time, see 05-359r1 */
104 * libata transport template. libata doesn't do real transport stuff.
105 * It just needs the eh_timed_out hook.
107 struct scsi_transport_template ata_scsi_transport_template = {
108 .eh_strategy_handler = ata_scsi_error,
109 .eh_timed_out = ata_scsi_timed_out,
110 .user_scan = ata_scsi_user_scan,
114 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
115 void (*done)(struct scsi_cmnd *))
117 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
118 /* "Invalid field in cbd" */
123 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
124 * @sdev: SCSI device for which BIOS geometry is to be determined
125 * @bdev: block device associated with @sdev
126 * @capacity: capacity of SCSI device
127 * @geom: location to which geometry will be output
129 * Generic bios head/sector/cylinder calculator
130 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
131 * mapping. Some situations may arise where the disk is not
132 * bootable if this is not used.
135 * Defined by the SCSI layer. We don't really care.
140 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
141 sector_t capacity, int geom[])
145 sector_div(capacity, 255*63);
152 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
153 * @scsidev: Device to which we are issuing command
154 * @arg: User provided data for issuing command
157 * Defined by the SCSI layer. We don't really care.
160 * Zero on success, negative errno on error.
163 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
166 u8 scsi_cmd[MAX_COMMAND_SIZE];
167 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
169 enum dma_data_direction data_dir;
175 if (copy_from_user(args, arg, sizeof(args)))
178 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
182 memset(scsi_cmd, 0, sizeof(scsi_cmd));
185 argsize = SECTOR_SIZE * args[3];
186 argbuf = kmalloc(argsize, GFP_KERNEL);
187 if (argbuf == NULL) {
192 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
193 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
194 block count in sector count field */
195 data_dir = DMA_FROM_DEVICE;
197 scsi_cmd[1] = (3 << 1); /* Non-data */
198 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
202 scsi_cmd[0] = ATA_16;
204 scsi_cmd[4] = args[2];
205 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
206 scsi_cmd[6] = args[3];
207 scsi_cmd[8] = args[1];
211 scsi_cmd[6] = args[1];
213 scsi_cmd[14] = args[0];
215 /* Good values for timeout and retries? Values below
216 from scsi_ioctl_send_command() for default case... */
217 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
218 sensebuf, (10*HZ), 5, 0);
220 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
221 u8 *desc = sensebuf + 8;
222 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
224 /* If we set cc then ATA pass-through will cause a
225 * check condition even if no error. Filter that. */
226 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
227 struct scsi_sense_hdr sshdr;
228 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
230 if (sshdr.sense_key==0 &&
231 sshdr.asc==0 && sshdr.ascq==0)
232 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
235 /* Send userspace a few ATA registers (same as drivers/ide) */
236 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
237 desc[0] == 0x09 ) { /* code is "ATA Descriptor" */
238 args[0] = desc[13]; /* status */
239 args[1] = desc[3]; /* error */
240 args[2] = desc[5]; /* sector count (0:7) */
241 if (copy_to_user(arg, args, sizeof(args)))
253 && copy_to_user(arg + sizeof(args), argbuf, argsize))
262 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
263 * @scsidev: Device to which we are issuing command
264 * @arg: User provided data for issuing command
267 * Defined by the SCSI layer. We don't really care.
270 * Zero on success, negative errno on error.
272 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
275 u8 scsi_cmd[MAX_COMMAND_SIZE];
277 struct scsi_sense_hdr sshdr;
282 if (copy_from_user(args, arg, sizeof(args)))
285 memset(scsi_cmd, 0, sizeof(scsi_cmd));
286 scsi_cmd[0] = ATA_16;
287 scsi_cmd[1] = (3 << 1); /* Non-data */
288 /* scsi_cmd[2] is already 0 -- no off.line, cc, or data xfer */
289 scsi_cmd[4] = args[1];
290 scsi_cmd[6] = args[2];
291 scsi_cmd[8] = args[3];
292 scsi_cmd[10] = args[4];
293 scsi_cmd[12] = args[5];
294 scsi_cmd[14] = args[0];
296 /* Good values for timeout and retries? Values below
297 from scsi_ioctl_send_command() for default case... */
298 if (scsi_execute_req(scsidev, scsi_cmd, DMA_NONE, NULL, 0, &sshdr,
302 /* Need code to retrieve data from check condition? */
306 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
308 int val = -EINVAL, rc = -EINVAL;
311 case ATA_IOC_GET_IO32:
313 if (copy_to_user(arg, &val, 1))
317 case ATA_IOC_SET_IO32:
318 val = (unsigned long) arg;
324 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
326 return ata_cmd_ioctl(scsidev, arg);
328 case HDIO_DRIVE_TASK:
329 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
331 return ata_task_ioctl(scsidev, arg);
342 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
343 * @dev: ATA device to which the new command is attached
344 * @cmd: SCSI command that originated this ATA command
345 * @done: SCSI command completion function
347 * Obtain a reference to an unused ata_queued_cmd structure,
348 * which is the basic libata structure representing a single
349 * ATA command sent to the hardware.
351 * If a command was available, fill in the SCSI-specific
352 * portions of the structure with information on the
356 * spin_lock_irqsave(host lock)
359 * Command allocated, or %NULL if none available.
361 struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
362 struct scsi_cmnd *cmd,
363 void (*done)(struct scsi_cmnd *))
365 struct ata_queued_cmd *qc;
367 qc = ata_qc_new_init(dev);
373 qc->__sg = (struct scatterlist *) cmd->request_buffer;
374 qc->n_elem = cmd->use_sg;
376 qc->__sg = &qc->sgent;
380 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
388 * ata_dump_status - user friendly display of error info
389 * @id: id of the port in question
390 * @tf: ptr to filled out taskfile
392 * Decode and dump the ATA error/status registers for the user so
393 * that they have some idea what really happened at the non
394 * make-believe layer.
397 * inherited from caller
399 void ata_dump_status(unsigned id, struct ata_taskfile *tf)
401 u8 stat = tf->command, err = tf->feature;
403 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
404 if (stat & ATA_BUSY) {
405 printk("Busy }\n"); /* Data is not valid in this case */
407 if (stat & 0x40) printk("DriveReady ");
408 if (stat & 0x20) printk("DeviceFault ");
409 if (stat & 0x10) printk("SeekComplete ");
410 if (stat & 0x08) printk("DataRequest ");
411 if (stat & 0x04) printk("CorrectedError ");
412 if (stat & 0x02) printk("Index ");
413 if (stat & 0x01) printk("Error ");
417 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
418 if (err & 0x04) printk("DriveStatusError ");
420 if (err & 0x04) printk("BadCRC ");
421 else printk("Sector ");
423 if (err & 0x40) printk("UncorrectableError ");
424 if (err & 0x10) printk("SectorIdNotFound ");
425 if (err & 0x02) printk("TrackZeroNotFound ");
426 if (err & 0x01) printk("AddrMarkNotFound ");
433 * ata_scsi_device_suspend - suspend ATA device associated with sdev
434 * @sdev: the SCSI device to suspend
435 * @mesg: target power management message
437 * Request suspend EH action on the ATA device associated with
438 * @sdev and wait for the operation to complete.
441 * Kernel thread context (may sleep).
444 * 0 on success, -errno otherwise.
446 int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t mesg)
448 struct ata_port *ap = ata_shost_to_port(sdev->host);
449 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
457 spin_lock_irqsave(ap->lock, flags);
459 /* wait for the previous resume to complete */
460 while (dev->flags & ATA_DFLAG_SUSPENDED) {
461 spin_unlock_irqrestore(ap->lock, flags);
462 ata_port_wait_eh(ap);
463 spin_lock_irqsave(ap->lock, flags);
466 /* if @sdev is already detached, nothing to do */
467 if (sdev->sdev_state == SDEV_OFFLINE ||
468 sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
471 /* request suspend */
472 action = ATA_EH_SUSPEND;
473 if (mesg.event != PM_EVENT_SUSPEND)
474 action |= ATA_EH_PM_FREEZE;
475 ap->eh_info.dev_action[dev->devno] |= action;
476 ap->eh_info.flags |= ATA_EHI_QUIET;
477 ata_port_schedule_eh(ap);
479 spin_unlock_irqrestore(ap->lock, flags);
481 /* wait for EH to do the job */
482 ata_port_wait_eh(ap);
484 spin_lock_irqsave(ap->lock, flags);
486 /* If @sdev is still attached but the associated ATA device
487 * isn't suspended, the operation failed.
489 if (sdev->sdev_state != SDEV_OFFLINE &&
490 sdev->sdev_state != SDEV_CANCEL && sdev->sdev_state != SDEV_DEL &&
491 !(dev->flags & ATA_DFLAG_SUSPENDED))
495 spin_unlock_irqrestore(ap->lock, flags);
498 sdev->sdev_gendev.power.power_state = mesg;
503 * ata_scsi_device_resume - resume ATA device associated with sdev
504 * @sdev: the SCSI device to resume
506 * Request resume EH action on the ATA device associated with
507 * @sdev and return immediately. This enables parallel
508 * wakeup/spinup of devices.
511 * Kernel thread context (may sleep).
516 int ata_scsi_device_resume(struct scsi_device *sdev)
518 struct ata_port *ap = ata_shost_to_port(sdev->host);
519 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
520 struct ata_eh_info *ehi = &ap->eh_info;
527 spin_lock_irqsave(ap->lock, flags);
529 /* if @sdev is already detached, nothing to do */
530 if (sdev->sdev_state == SDEV_OFFLINE ||
531 sdev->sdev_state == SDEV_CANCEL || sdev->sdev_state == SDEV_DEL)
535 action = ATA_EH_RESUME;
536 if (sdev->sdev_gendev.power.power_state.event == PM_EVENT_SUSPEND)
537 __ata_ehi_hotplugged(ehi);
539 action |= ATA_EH_PM_FREEZE | ATA_EH_SOFTRESET;
540 ehi->dev_action[dev->devno] |= action;
542 /* We don't want autopsy and verbose EH messages. Disable
543 * those if we're the only device on this link.
545 if (ata_port_max_devices(ap) == 1)
546 ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;
548 ata_port_schedule_eh(ap);
551 spin_unlock_irqrestore(ap->lock, flags);
553 sdev->sdev_gendev.power.power_state = PMSG_ON;
558 * ata_to_sense_error - convert ATA error to SCSI error
559 * @id: ATA device number
560 * @drv_stat: value contained in ATA status register
561 * @drv_err: value contained in ATA error register
562 * @sk: the sense key we'll fill out
563 * @asc: the additional sense code we'll fill out
564 * @ascq: the additional sense code qualifier we'll fill out
565 * @verbose: be verbose
567 * Converts an ATA error into a SCSI error. Fill out pointers to
568 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
569 * format sense blocks.
572 * spin_lock_irqsave(host lock)
574 void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
575 u8 *ascq, int verbose)
579 /* Based on the 3ware driver translation table */
580 static const unsigned char sense_table[][4] = {
582 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
584 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
586 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
587 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
588 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
589 /* MC|ID|ABRT|TRK0|MARK */
590 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
592 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
593 /* Bad address mark */
594 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
596 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
598 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
599 /* Media change request */
600 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
602 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
604 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
606 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
607 /* BBD - block marked bad */
608 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
609 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
611 static const unsigned char stat_table[][4] = {
612 /* Must be first because BUSY means no other bits valid */
613 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
614 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
615 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
616 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
617 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
621 * Is this an error we can process/parse
623 if (drv_stat & ATA_BUSY) {
624 drv_err = 0; /* Ignore the err bits, they're invalid */
628 /* Look for drv_err */
629 for (i = 0; sense_table[i][0] != 0xFF; i++) {
630 /* Look for best matches first */
631 if ((sense_table[i][0] & drv_err) ==
633 *sk = sense_table[i][1];
634 *asc = sense_table[i][2];
635 *ascq = sense_table[i][3];
639 /* No immediate match */
641 printk(KERN_WARNING "ata%u: no sense translation for "
642 "error 0x%02x\n", id, drv_err);
645 /* Fall back to interpreting status bits */
646 for (i = 0; stat_table[i][0] != 0xFF; i++) {
647 if (stat_table[i][0] & drv_stat) {
648 *sk = stat_table[i][1];
649 *asc = stat_table[i][2];
650 *ascq = stat_table[i][3];
654 /* No error? Undecoded? */
656 printk(KERN_WARNING "ata%u: no sense translation for "
657 "status: 0x%02x\n", id, drv_stat);
659 /* We need a sensible error return here, which is tricky, and one
660 that won't cause people to do things like return a disk wrongly */
661 *sk = ABORTED_COMMAND;
667 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
668 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
669 id, drv_stat, drv_err, *sk, *asc, *ascq);
674 * ata_gen_ata_desc_sense - Generate check condition sense block.
675 * @qc: Command that completed.
677 * This function is specific to the ATA descriptor format sense
678 * block specified for the ATA pass through commands. Regardless
679 * of whether the command errored or not, return a sense
680 * block. Copy all controller registers into the sense
681 * block. Clear sense key, ASC & ASCQ if there is no error.
684 * spin_lock_irqsave(host lock)
686 void ata_gen_ata_desc_sense(struct ata_queued_cmd *qc)
688 struct scsi_cmnd *cmd = qc->scsicmd;
689 struct ata_taskfile *tf = &qc->result_tf;
690 unsigned char *sb = cmd->sense_buffer;
691 unsigned char *desc = sb + 8;
692 int verbose = qc->ap->ops->error_handler == NULL;
694 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
696 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
699 * Use ata_to_sense_error() to map status register bits
700 * onto sense key, asc & ascq.
703 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
704 ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
705 &sb[1], &sb[2], &sb[3], verbose);
710 * Sense data is current and format is descriptor.
717 * Set length of additional sense data.
718 * Since we only populate descriptor 0, the total
719 * length is the same (fixed) length as descriptor 0.
721 desc[1] = sb[7] = 14;
724 * Copy registers into sense buffer.
727 desc[3] = tf->feature; /* == error reg */
732 desc[12] = tf->device;
733 desc[13] = tf->command; /* == status reg */
736 * Fill in Extend bit, and the high order bytes
739 if (tf->flags & ATA_TFLAG_LBA48) {
741 desc[4] = tf->hob_nsect;
742 desc[6] = tf->hob_lbal;
743 desc[8] = tf->hob_lbam;
744 desc[10] = tf->hob_lbah;
749 * ata_gen_fixed_sense - generate a SCSI fixed sense block
750 * @qc: Command that we are erroring out
752 * Leverage ata_to_sense_error() to give us the codes. Fit our
753 * LBA in here if there's room.
756 * inherited from caller
758 void ata_gen_fixed_sense(struct ata_queued_cmd *qc)
760 struct scsi_cmnd *cmd = qc->scsicmd;
761 struct ata_taskfile *tf = &qc->result_tf;
762 unsigned char *sb = cmd->sense_buffer;
763 int verbose = qc->ap->ops->error_handler == NULL;
765 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
767 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
770 * Use ata_to_sense_error() to map status register bits
771 * onto sense key, asc & ascq.
774 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
775 ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
776 &sb[2], &sb[12], &sb[13], verbose);
783 if (tf->flags & ATA_TFLAG_LBA48) {
784 /* TODO: find solution for LBA48 descriptors */
787 else if (tf->flags & ATA_TFLAG_LBA) {
788 /* A small (28b) LBA will fit in the 32b info field */
789 sb[0] |= 0x80; /* set valid bit */
790 sb[3] = tf->device & 0x0f;
801 static void ata_scsi_sdev_config(struct scsi_device *sdev)
803 sdev->use_10_for_rw = 1;
804 sdev->use_10_for_ms = 1;
807 static void ata_scsi_dev_config(struct scsi_device *sdev,
808 struct ata_device *dev)
810 /* configure max sectors */
811 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
813 /* SATA DMA transfers must be multiples of 4 byte, so
814 * we need to pad ATAPI transfers using an extra sg.
815 * Decrement max hw segments accordingly.
817 if (dev->class == ATA_DEV_ATAPI) {
818 request_queue_t *q = sdev->request_queue;
819 blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
822 if (dev->flags & ATA_DFLAG_NCQ) {
825 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
826 depth = min(ATA_MAX_QUEUE - 1, depth);
827 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
832 * ata_scsi_slave_config - Set SCSI device attributes
833 * @sdev: SCSI device to examine
835 * This is called before we actually start reading
836 * and writing to the device, to configure certain
837 * SCSI mid-layer behaviors.
840 * Defined by SCSI layer. We don't really care.
843 int ata_scsi_slave_config(struct scsi_device *sdev)
845 struct ata_port *ap = ata_shost_to_port(sdev->host);
846 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
848 ata_scsi_sdev_config(sdev);
850 blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
853 ata_scsi_dev_config(sdev, dev);
855 return 0; /* scsi layer doesn't check return value, sigh */
859 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
860 * @sdev: SCSI device to be destroyed
862 * @sdev is about to be destroyed for hot/warm unplugging. If
863 * this unplugging was initiated by libata as indicated by NULL
864 * dev->sdev, this function doesn't have to do anything.
865 * Otherwise, SCSI layer initiated warm-unplug is in progress.
866 * Clear dev->sdev, schedule the device for ATA detach and invoke
870 * Defined by SCSI layer. We don't really care.
872 void ata_scsi_slave_destroy(struct scsi_device *sdev)
874 struct ata_port *ap = ata_shost_to_port(sdev->host);
876 struct ata_device *dev;
878 if (!ap->ops->error_handler)
881 spin_lock_irqsave(ap->lock, flags);
882 dev = __ata_scsi_find_dev(ap, sdev);
883 if (dev && dev->sdev) {
884 /* SCSI device already in CANCEL state, no need to offline it */
886 dev->flags |= ATA_DFLAG_DETACH;
887 ata_port_schedule_eh(ap);
889 spin_unlock_irqrestore(ap->lock, flags);
893 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
894 * @sdev: SCSI device to configure queue depth for
895 * @queue_depth: new queue depth
897 * This is libata standard hostt->change_queue_depth callback.
898 * SCSI will call into this callback when user tries to set queue
902 * SCSI layer (we don't care)
905 * Newly configured queue depth.
907 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
909 struct ata_port *ap = ata_shost_to_port(sdev->host);
910 struct ata_device *dev;
915 return sdev->queue_depth;
917 dev = ata_scsi_find_dev(ap, sdev);
918 if (!dev || !ata_dev_enabled(dev))
919 return sdev->queue_depth;
921 max_depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
922 max_depth = min(ATA_MAX_QUEUE - 1, max_depth);
923 if (queue_depth > max_depth)
924 queue_depth = max_depth;
926 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
928 spin_lock_irqsave(ap->lock, flags);
930 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
932 dev->flags |= ATA_DFLAG_NCQ_OFF;
933 spin_unlock_irqrestore(ap->lock, flags);
939 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
940 * @qc: Storage for translated ATA taskfile
941 * @scsicmd: SCSI command to translate
943 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
944 * (to start). Perhaps these commands should be preceded by
945 * CHECK POWER MODE to see what power mode the device is already in.
946 * [See SAT revision 5 at www.t10.org]
949 * spin_lock_irqsave(host lock)
952 * Zero on success, non-zero on error.
955 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
958 struct ata_taskfile *tf = &qc->tf;
960 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
961 tf->protocol = ATA_PROT_NODATA;
962 if (scsicmd[1] & 0x1) {
963 ; /* ignore IMMED bit, violates sat-r05 */
965 if (scsicmd[4] & 0x2)
966 goto invalid_fld; /* LOEJ bit set not supported */
967 if (((scsicmd[4] >> 4) & 0xf) != 0)
968 goto invalid_fld; /* power conditions not supported */
969 if (scsicmd[4] & 0x1) {
970 tf->nsect = 1; /* 1 sector, lba=0 */
972 if (qc->dev->flags & ATA_DFLAG_LBA) {
973 tf->flags |= ATA_TFLAG_LBA;
978 tf->device |= ATA_LBA;
981 tf->lbal = 0x1; /* sect */
982 tf->lbam = 0x0; /* cyl low */
983 tf->lbah = 0x0; /* cyl high */
986 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
988 tf->nsect = 0; /* time period value (0 implies now) */
989 tf->command = ATA_CMD_STANDBY;
990 /* Consider: ATA STANDBY IMMEDIATE command */
993 * Standby and Idle condition timers could be implemented but that
994 * would require libata to implement the Power condition mode page
995 * and allow the user to change it. Changing mode pages requires
996 * MODE SELECT to be implemented.
1002 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
1003 /* "Invalid field in cbd" */
1009 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1010 * @qc: Storage for translated ATA taskfile
1011 * @scsicmd: SCSI command to translate (ignored)
1013 * Sets up an ATA taskfile to issue FLUSH CACHE or
1017 * spin_lock_irqsave(host lock)
1020 * Zero on success, non-zero on error.
1023 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
1025 struct ata_taskfile *tf = &qc->tf;
1027 tf->flags |= ATA_TFLAG_DEVICE;
1028 tf->protocol = ATA_PROT_NODATA;
1030 if ((qc->dev->flags & ATA_DFLAG_LBA48) &&
1031 (ata_id_has_flush_ext(qc->dev->id)))
1032 tf->command = ATA_CMD_FLUSH_EXT;
1034 tf->command = ATA_CMD_FLUSH;
1040 * scsi_6_lba_len - Get LBA and transfer length
1041 * @scsicmd: SCSI command to translate
1043 * Calculate LBA and transfer length for 6-byte commands.
1047 * @plen: the transfer length
1050 static void scsi_6_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
1055 VPRINTK("six-byte command\n");
1057 lba |= ((u64)scsicmd[2]) << 8;
1058 lba |= ((u64)scsicmd[3]);
1060 len |= ((u32)scsicmd[4]);
1067 * scsi_10_lba_len - Get LBA and transfer length
1068 * @scsicmd: SCSI command to translate
1070 * Calculate LBA and transfer length for 10-byte commands.
1074 * @plen: the transfer length
1077 static void scsi_10_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
1082 VPRINTK("ten-byte command\n");
1084 lba |= ((u64)scsicmd[2]) << 24;
1085 lba |= ((u64)scsicmd[3]) << 16;
1086 lba |= ((u64)scsicmd[4]) << 8;
1087 lba |= ((u64)scsicmd[5]);
1089 len |= ((u32)scsicmd[7]) << 8;
1090 len |= ((u32)scsicmd[8]);
1097 * scsi_16_lba_len - Get LBA and transfer length
1098 * @scsicmd: SCSI command to translate
1100 * Calculate LBA and transfer length for 16-byte commands.
1104 * @plen: the transfer length
1107 static void scsi_16_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
1112 VPRINTK("sixteen-byte command\n");
1114 lba |= ((u64)scsicmd[2]) << 56;
1115 lba |= ((u64)scsicmd[3]) << 48;
1116 lba |= ((u64)scsicmd[4]) << 40;
1117 lba |= ((u64)scsicmd[5]) << 32;
1118 lba |= ((u64)scsicmd[6]) << 24;
1119 lba |= ((u64)scsicmd[7]) << 16;
1120 lba |= ((u64)scsicmd[8]) << 8;
1121 lba |= ((u64)scsicmd[9]);
1123 len |= ((u32)scsicmd[10]) << 24;
1124 len |= ((u32)scsicmd[11]) << 16;
1125 len |= ((u32)scsicmd[12]) << 8;
1126 len |= ((u32)scsicmd[13]);
1133 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1134 * @qc: Storage for translated ATA taskfile
1135 * @scsicmd: SCSI command to translate
1137 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1140 * spin_lock_irqsave(host lock)
1143 * Zero on success, non-zero on error.
1146 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
1148 struct ata_taskfile *tf = &qc->tf;
1149 struct ata_device *dev = qc->dev;
1150 u64 dev_sectors = qc->dev->n_sectors;
1154 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1155 tf->protocol = ATA_PROT_NODATA;
1157 if (scsicmd[0] == VERIFY)
1158 scsi_10_lba_len(scsicmd, &block, &n_block);
1159 else if (scsicmd[0] == VERIFY_16)
1160 scsi_16_lba_len(scsicmd, &block, &n_block);
1166 if (block >= dev_sectors)
1168 if ((block + n_block) > dev_sectors)
1171 if (dev->flags & ATA_DFLAG_LBA) {
1172 tf->flags |= ATA_TFLAG_LBA;
1174 if (lba_28_ok(block, n_block)) {
1176 tf->command = ATA_CMD_VERIFY;
1177 tf->device |= (block >> 24) & 0xf;
1178 } else if (lba_48_ok(block, n_block)) {
1179 if (!(dev->flags & ATA_DFLAG_LBA48))
1183 tf->flags |= ATA_TFLAG_LBA48;
1184 tf->command = ATA_CMD_VERIFY_EXT;
1186 tf->hob_nsect = (n_block >> 8) & 0xff;
1188 tf->hob_lbah = (block >> 40) & 0xff;
1189 tf->hob_lbam = (block >> 32) & 0xff;
1190 tf->hob_lbal = (block >> 24) & 0xff;
1192 /* request too large even for LBA48 */
1195 tf->nsect = n_block & 0xff;
1197 tf->lbah = (block >> 16) & 0xff;
1198 tf->lbam = (block >> 8) & 0xff;
1199 tf->lbal = block & 0xff;
1201 tf->device |= ATA_LBA;
1204 u32 sect, head, cyl, track;
1206 if (!lba_28_ok(block, n_block))
1209 /* Convert LBA to CHS */
1210 track = (u32)block / dev->sectors;
1211 cyl = track / dev->heads;
1212 head = track % dev->heads;
1213 sect = (u32)block % dev->sectors + 1;
1215 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1216 (u32)block, track, cyl, head, sect);
1218 /* Check whether the converted CHS can fit.
1222 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1225 tf->command = ATA_CMD_VERIFY;
1226 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1229 tf->lbah = cyl >> 8;
1236 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
1237 /* "Invalid field in cbd" */
1241 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
1242 /* "Logical Block Address out of range" */
1246 qc->scsicmd->result = SAM_STAT_GOOD;
1251 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1252 * @qc: Storage for translated ATA taskfile
1253 * @scsicmd: SCSI command to translate
1255 * Converts any of six SCSI read/write commands into the
1256 * ATA counterpart, including starting sector (LBA),
1257 * sector count, and taking into account the device's LBA48
1260 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1261 * %WRITE_16 are currently supported.
1264 * spin_lock_irqsave(host lock)
1267 * Zero on success, non-zero on error.
1270 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
1272 struct ata_taskfile *tf = &qc->tf;
1273 struct ata_device *dev = qc->dev;
1277 qc->flags |= ATA_QCFLAG_IO;
1278 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1280 if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||
1281 scsicmd[0] == WRITE_16)
1282 tf->flags |= ATA_TFLAG_WRITE;
1284 /* Calculate the SCSI LBA, transfer length and FUA. */
1285 switch (scsicmd[0]) {
1288 scsi_10_lba_len(scsicmd, &block, &n_block);
1289 if (unlikely(scsicmd[1] & (1 << 3)))
1290 tf->flags |= ATA_TFLAG_FUA;
1294 scsi_6_lba_len(scsicmd, &block, &n_block);
1296 /* for 6-byte r/w commands, transfer length 0
1297 * means 256 blocks of data, not 0 block.
1304 scsi_16_lba_len(scsicmd, &block, &n_block);
1305 if (unlikely(scsicmd[1] & (1 << 3)))
1306 tf->flags |= ATA_TFLAG_FUA;
1309 DPRINTK("no-byte command\n");
1313 /* Check and compose ATA command */
1315 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1316 * length 0 means transfer 0 block of data.
1317 * However, for ATA R/W commands, sector count 0 means
1318 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1320 * WARNING: one or two older ATA drives treat 0 as 0...
1324 if ((dev->flags & (ATA_DFLAG_PIO | ATA_DFLAG_NCQ_OFF |
1325 ATA_DFLAG_NCQ)) == ATA_DFLAG_NCQ) {
1327 if (!lba_48_ok(block, n_block))
1330 tf->protocol = ATA_PROT_NCQ;
1331 tf->flags |= ATA_TFLAG_LBA | ATA_TFLAG_LBA48;
1333 if (tf->flags & ATA_TFLAG_WRITE)
1334 tf->command = ATA_CMD_FPDMA_WRITE;
1336 tf->command = ATA_CMD_FPDMA_READ;
1338 qc->nsect = n_block;
1340 tf->nsect = qc->tag << 3;
1341 tf->hob_feature = (n_block >> 8) & 0xff;
1342 tf->feature = n_block & 0xff;
1344 tf->hob_lbah = (block >> 40) & 0xff;
1345 tf->hob_lbam = (block >> 32) & 0xff;
1346 tf->hob_lbal = (block >> 24) & 0xff;
1347 tf->lbah = (block >> 16) & 0xff;
1348 tf->lbam = (block >> 8) & 0xff;
1349 tf->lbal = block & 0xff;
1351 tf->device = 1 << 6;
1352 if (tf->flags & ATA_TFLAG_FUA)
1353 tf->device |= 1 << 7;
1354 } else if (dev->flags & ATA_DFLAG_LBA) {
1355 tf->flags |= ATA_TFLAG_LBA;
1357 if (lba_28_ok(block, n_block)) {
1359 tf->device |= (block >> 24) & 0xf;
1360 } else if (lba_48_ok(block, n_block)) {
1361 if (!(dev->flags & ATA_DFLAG_LBA48))
1365 tf->flags |= ATA_TFLAG_LBA48;
1367 tf->hob_nsect = (n_block >> 8) & 0xff;
1369 tf->hob_lbah = (block >> 40) & 0xff;
1370 tf->hob_lbam = (block >> 32) & 0xff;
1371 tf->hob_lbal = (block >> 24) & 0xff;
1373 /* request too large even for LBA48 */
1376 if (unlikely(ata_rwcmd_protocol(qc) < 0))
1379 qc->nsect = n_block;
1380 tf->nsect = n_block & 0xff;
1382 tf->lbah = (block >> 16) & 0xff;
1383 tf->lbam = (block >> 8) & 0xff;
1384 tf->lbal = block & 0xff;
1386 tf->device |= ATA_LBA;
1389 u32 sect, head, cyl, track;
1391 /* The request -may- be too large for CHS addressing. */
1392 if (!lba_28_ok(block, n_block))
1395 if (unlikely(ata_rwcmd_protocol(qc) < 0))
1398 /* Convert LBA to CHS */
1399 track = (u32)block / dev->sectors;
1400 cyl = track / dev->heads;
1401 head = track % dev->heads;
1402 sect = (u32)block % dev->sectors + 1;
1404 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1405 (u32)block, track, cyl, head, sect);
1407 /* Check whether the converted CHS can fit.
1411 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1414 qc->nsect = n_block;
1415 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1418 tf->lbah = cyl >> 8;
1425 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
1426 /* "Invalid field in cbd" */
1430 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
1431 /* "Logical Block Address out of range" */
1435 qc->scsicmd->result = SAM_STAT_GOOD;
1439 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1441 struct ata_port *ap = qc->ap;
1442 struct scsi_cmnd *cmd = qc->scsicmd;
1443 u8 *cdb = cmd->cmnd;
1444 int need_sense = (qc->err_mask != 0);
1446 /* We snoop the SET_FEATURES - Write Cache ON/OFF command, and
1447 * schedule EH_REVALIDATE operation to update the IDENTIFY DEVICE
1450 if (ap->ops->error_handler &&
1451 !need_sense && (qc->tf.command == ATA_CMD_SET_FEATURES) &&
1452 ((qc->tf.feature == SETFEATURES_WC_ON) ||
1453 (qc->tf.feature == SETFEATURES_WC_OFF))) {
1454 ap->eh_info.action |= ATA_EH_REVALIDATE;
1455 ata_port_schedule_eh(ap);
1458 /* For ATA pass thru (SAT) commands, generate a sense block if
1459 * user mandated it or if there's an error. Note that if we
1460 * generate because the user forced us to, a check condition
1461 * is generated and the ATA register values are returned
1462 * whether the command completed successfully or not. If there
1463 * was no error, SK, ASC and ASCQ will all be zero.
1465 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1466 ((cdb[2] & 0x20) || need_sense)) {
1467 ata_gen_ata_desc_sense(qc);
1470 cmd->result = SAM_STAT_GOOD;
1472 /* TODO: decide which descriptor format to use
1473 * for 48b LBA devices and call that here
1474 * instead of the fixed desc, which is only
1475 * good for smaller LBA (and maybe CHS?)
1478 ata_gen_fixed_sense(qc);
1482 if (need_sense && !ap->ops->error_handler)
1483 ata_dump_status(ap->id, &qc->result_tf);
1491 * ata_scmd_need_defer - Check whether we need to defer scmd
1492 * @dev: ATA device to which the command is addressed
1493 * @is_io: Is the command IO (and thus possibly NCQ)?
1495 * NCQ and non-NCQ commands cannot run together. As upper layer
1496 * only knows the queue depth, we are responsible for maintaining
1497 * exclusion. This function checks whether a new command can be
1501 * spin_lock_irqsave(host lock)
1504 * 1 if deferring is needed, 0 otherwise.
1506 static int ata_scmd_need_defer(struct ata_device *dev, int is_io)
1508 struct ata_port *ap = dev->ap;
1510 if (!(dev->flags & ATA_DFLAG_NCQ))
1514 if (!ata_tag_valid(ap->active_tag))
1517 if (!ata_tag_valid(ap->active_tag) && !ap->sactive)
1524 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1525 * @dev: ATA device to which the command is addressed
1526 * @cmd: SCSI command to execute
1527 * @done: SCSI command completion function
1528 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1530 * Our ->queuecommand() function has decided that the SCSI
1531 * command issued can be directly translated into an ATA
1532 * command, rather than handled internally.
1534 * This function sets up an ata_queued_cmd structure for the
1535 * SCSI command, and sends that ata_queued_cmd to the hardware.
1537 * The xlat_func argument (actor) returns 0 if ready to execute
1538 * ATA command, else 1 to finish translation. If 1 is returned
1539 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1540 * to be set reflecting an error condition or clean (early)
1544 * spin_lock_irqsave(host lock)
1547 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1548 * needs to be deferred.
1550 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1551 void (*done)(struct scsi_cmnd *),
1552 ata_xlat_func_t xlat_func)
1554 struct ata_queued_cmd *qc;
1555 u8 *scsicmd = cmd->cmnd;
1556 int is_io = xlat_func == ata_scsi_rw_xlat;
1560 if (unlikely(ata_scmd_need_defer(dev, is_io)))
1563 qc = ata_scsi_qc_new(dev, cmd, done);
1567 /* data is present; dma-map it */
1568 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1569 cmd->sc_data_direction == DMA_TO_DEVICE) {
1570 if (unlikely(cmd->request_bufflen < 1)) {
1571 ata_dev_printk(dev, KERN_WARNING,
1572 "WARNING: zero len r/w req\n");
1577 ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
1579 ata_sg_init_one(qc, cmd->request_buffer,
1580 cmd->request_bufflen);
1582 qc->dma_dir = cmd->sc_data_direction;
1585 qc->complete_fn = ata_scsi_qc_complete;
1587 if (xlat_func(qc, scsicmd))
1590 /* select device, send command to hardware */
1599 DPRINTK("EXIT - early finish (good or error)\n");
1604 cmd->result = (DID_ERROR << 16);
1607 DPRINTK("EXIT - internal\n");
1611 DPRINTK("EXIT - defer\n");
1612 return SCSI_MLQUEUE_DEVICE_BUSY;
1616 * ata_scsi_rbuf_get - Map response buffer.
1617 * @cmd: SCSI command containing buffer to be mapped.
1618 * @buf_out: Pointer to mapped area.
1620 * Maps buffer contained within SCSI command @cmd.
1623 * spin_lock_irqsave(host lock)
1626 * Length of response buffer.
1629 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
1632 unsigned int buflen;
1635 struct scatterlist *sg;
1637 sg = (struct scatterlist *) cmd->request_buffer;
1638 buf = kmap_atomic(sg->page, KM_USER0) + sg->offset;
1639 buflen = sg->length;
1641 buf = cmd->request_buffer;
1642 buflen = cmd->request_bufflen;
1650 * ata_scsi_rbuf_put - Unmap response buffer.
1651 * @cmd: SCSI command containing buffer to be unmapped.
1652 * @buf: buffer to unmap
1654 * Unmaps response buffer contained within @cmd.
1657 * spin_lock_irqsave(host lock)
1660 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
1663 struct scatterlist *sg;
1665 sg = (struct scatterlist *) cmd->request_buffer;
1666 kunmap_atomic(buf - sg->offset, KM_USER0);
1671 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1672 * @args: device IDENTIFY data / SCSI command of interest.
1673 * @actor: Callback hook for desired SCSI command simulator
1675 * Takes care of the hard work of simulating a SCSI command...
1676 * Mapping the response buffer, calling the command's handler,
1677 * and handling the handler's return value. This return value
1678 * indicates whether the handler wishes the SCSI command to be
1679 * completed successfully (0), or not (in which case cmd->result
1680 * and sense buffer are assumed to be set).
1683 * spin_lock_irqsave(host lock)
1686 void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1687 unsigned int (*actor) (struct ata_scsi_args *args,
1688 u8 *rbuf, unsigned int buflen))
1691 unsigned int buflen, rc;
1692 struct scsi_cmnd *cmd = args->cmd;
1694 buflen = ata_scsi_rbuf_get(cmd, &rbuf);
1695 memset(rbuf, 0, buflen);
1696 rc = actor(args, rbuf, buflen);
1697 ata_scsi_rbuf_put(cmd, rbuf);
1700 cmd->result = SAM_STAT_GOOD;
1705 * ata_scsiop_inq_std - Simulate INQUIRY command
1706 * @args: device IDENTIFY data / SCSI command of interest.
1707 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1708 * @buflen: Response buffer length.
1710 * Returns standard device identification data associated
1711 * with non-VPD INQUIRY command output.
1714 * spin_lock_irqsave(host lock)
1717 unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
1718 unsigned int buflen)
1723 0x5, /* claim SPC-3 version compatibility */
1728 /* set scsi removeable (RMB) bit per ata bit */
1729 if (ata_id_removeable(args->id))
1734 memcpy(rbuf, hdr, sizeof(hdr));
1737 memcpy(&rbuf[8], "ATA ", 8);
1738 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD_OFS, 16);
1739 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV_OFS, 4);
1740 if (rbuf[32] == 0 || rbuf[32] == ' ')
1741 memcpy(&rbuf[32], "n/a ", 4);
1745 const u8 versions[] = {
1746 0x60, /* SAM-3 (no version claimed) */
1749 0x20, /* SBC-2 (no version claimed) */
1752 0x60 /* SPC-3 (no version claimed) */
1755 memcpy(rbuf + 59, versions, sizeof(versions));
1762 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1763 * @args: device IDENTIFY data / SCSI command of interest.
1764 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1765 * @buflen: Response buffer length.
1767 * Returns list of inquiry VPD pages available.
1770 * spin_lock_irqsave(host lock)
1773 unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
1774 unsigned int buflen)
1776 const u8 pages[] = {
1777 0x00, /* page 0x00, this page */
1778 0x80, /* page 0x80, unit serial no page */
1779 0x83 /* page 0x83, device ident page */
1781 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1784 memcpy(rbuf + 4, pages, sizeof(pages));
1790 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1791 * @args: device IDENTIFY data / SCSI command of interest.
1792 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1793 * @buflen: Response buffer length.
1795 * Returns ATA device serial number.
1798 * spin_lock_irqsave(host lock)
1801 unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
1802 unsigned int buflen)
1806 0x80, /* this page code */
1808 ATA_SERNO_LEN, /* page len */
1810 memcpy(rbuf, hdr, sizeof(hdr));
1812 if (buflen > (ATA_SERNO_LEN + 4 - 1))
1813 ata_id_string(args->id, (unsigned char *) &rbuf[4],
1814 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1820 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1821 * @args: device IDENTIFY data / SCSI command of interest.
1822 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1823 * @buflen: Response buffer length.
1825 * Yields two logical unit device identification designators:
1826 * - vendor specific ASCII containing the ATA serial number
1827 * - SAT defined "t10 vendor id based" containing ASCII vendor
1828 * name ("ATA "), model and serial numbers.
1831 * spin_lock_irqsave(host lock)
1834 unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
1835 unsigned int buflen)
1838 const int sat_model_serial_desc_len = 68;
1839 const int ata_model_byte_len = 40;
1841 rbuf[1] = 0x83; /* this page code */
1844 if (buflen > (ATA_SERNO_LEN + num + 3)) {
1845 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
1847 rbuf[num + 3] = ATA_SERNO_LEN;
1849 ata_id_string(args->id, (unsigned char *) rbuf + num,
1850 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1851 num += ATA_SERNO_LEN;
1853 if (buflen > (sat_model_serial_desc_len + num + 3)) {
1854 /* SAT defined lu model and serial numbers descriptor */
1855 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
1858 rbuf[num + 3] = sat_model_serial_desc_len;
1860 memcpy(rbuf + num, "ATA ", 8);
1862 ata_id_string(args->id, (unsigned char *) rbuf + num,
1863 ATA_ID_PROD_OFS, ata_model_byte_len);
1864 num += ata_model_byte_len;
1865 ata_id_string(args->id, (unsigned char *) rbuf + num,
1866 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1867 num += ATA_SERNO_LEN;
1869 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1874 * ata_scsiop_noop - Command handler that simply returns success.
1875 * @args: device IDENTIFY data / SCSI command of interest.
1876 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1877 * @buflen: Response buffer length.
1879 * No operation. Simply returns success to caller, to indicate
1880 * that the caller should successfully complete this SCSI command.
1883 * spin_lock_irqsave(host lock)
1886 unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
1887 unsigned int buflen)
1894 * ata_msense_push - Push data onto MODE SENSE data output buffer
1895 * @ptr_io: (input/output) Location to store more output data
1896 * @last: End of output data buffer
1897 * @buf: Pointer to BLOB being added to output buffer
1898 * @buflen: Length of BLOB
1900 * Store MODE SENSE data on an output buffer.
1906 static void ata_msense_push(u8 **ptr_io, const u8 *last,
1907 const u8 *buf, unsigned int buflen)
1911 if ((ptr + buflen - 1) > last)
1914 memcpy(ptr, buf, buflen);
1922 * ata_msense_caching - Simulate MODE SENSE caching info page
1923 * @id: device IDENTIFY data
1924 * @ptr_io: (input/output) Location to store more output data
1925 * @last: End of output data buffer
1927 * Generate a caching info page, which conditionally indicates
1928 * write caching to the SCSI layer, depending on device
1935 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
1938 u8 page[CACHE_MPAGE_LEN];
1940 memcpy(page, def_cache_mpage, sizeof(page));
1941 if (ata_id_wcache_enabled(id))
1942 page[2] |= (1 << 2); /* write cache enable */
1943 if (!ata_id_rahead_enabled(id))
1944 page[12] |= (1 << 5); /* disable read ahead */
1946 ata_msense_push(ptr_io, last, page, sizeof(page));
1947 return sizeof(page);
1951 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
1952 * @dev: Device associated with this MODE SENSE command
1953 * @ptr_io: (input/output) Location to store more output data
1954 * @last: End of output data buffer
1956 * Generate a generic MODE SENSE control mode page.
1962 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
1964 ata_msense_push(ptr_io, last, def_control_mpage,
1965 sizeof(def_control_mpage));
1966 return sizeof(def_control_mpage);
1970 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
1971 * @dev: Device associated with this MODE SENSE command
1972 * @ptr_io: (input/output) Location to store more output data
1973 * @last: End of output data buffer
1975 * Generate a generic MODE SENSE r/w error recovery page.
1981 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
1984 ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
1985 sizeof(def_rw_recovery_mpage));
1986 return sizeof(def_rw_recovery_mpage);
1990 * We can turn this into a real blacklist if it's needed, for now just
1991 * blacklist any Maxtor BANC1G10 revision firmware
1993 static int ata_dev_supports_fua(u16 *id)
1995 unsigned char model[41], fw[9];
1999 if (!ata_id_has_fua(id))
2002 ata_id_c_string(id, model, ATA_ID_PROD_OFS, sizeof(model));
2003 ata_id_c_string(id, fw, ATA_ID_FW_REV_OFS, sizeof(fw));
2005 if (strcmp(model, "Maxtor"))
2007 if (strcmp(fw, "BANC1G10"))
2010 return 0; /* blacklisted */
2014 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2015 * @args: device IDENTIFY data / SCSI command of interest.
2016 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2017 * @buflen: Response buffer length.
2019 * Simulate MODE SENSE commands. Assume this is invoked for direct
2020 * access devices (e.g. disks) only. There should be no block
2021 * descriptor for other device types.
2024 * spin_lock_irqsave(host lock)
2027 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
2028 unsigned int buflen)
2030 struct ata_device *dev = args->dev;
2031 u8 *scsicmd = args->cmd->cmnd, *p, *last;
2032 const u8 sat_blk_desc[] = {
2033 0, 0, 0, 0, /* number of blocks: sat unspecified */
2035 0, 0x2, 0x0 /* block length: 512 bytes */
2038 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
2043 six_byte = (scsicmd[0] == MODE_SENSE);
2044 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2046 * LLBA bit in msense(10) ignored (compliant)
2049 page_control = scsicmd[2] >> 6;
2050 switch (page_control) {
2051 case 0: /* current */
2052 break; /* supported */
2054 goto saving_not_supp;
2055 case 1: /* changeable */
2056 case 2: /* defaults */
2062 output_len = 4 + (ebd ? 8 : 0);
2063 alloc_len = scsicmd[4];
2065 output_len = 8 + (ebd ? 8 : 0);
2066 alloc_len = (scsicmd[7] << 8) + scsicmd[8];
2068 minlen = (alloc_len < buflen) ? alloc_len : buflen;
2070 p = rbuf + output_len;
2071 last = rbuf + minlen - 1;
2073 pg = scsicmd[2] & 0x3f;
2076 * No mode subpages supported (yet) but asking for _all_
2077 * subpages may be valid
2079 if (spg && (spg != ALL_SUB_MPAGES))
2083 case RW_RECOVERY_MPAGE:
2084 output_len += ata_msense_rw_recovery(&p, last);
2088 output_len += ata_msense_caching(args->id, &p, last);
2091 case CONTROL_MPAGE: {
2092 output_len += ata_msense_ctl_mode(&p, last);
2097 output_len += ata_msense_rw_recovery(&p, last);
2098 output_len += ata_msense_caching(args->id, &p, last);
2099 output_len += ata_msense_ctl_mode(&p, last);
2102 default: /* invalid page code */
2110 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2111 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2116 rbuf[0] = output_len;
2121 rbuf[3] = sizeof(sat_blk_desc);
2123 memcpy(rbuf + 4, sat_blk_desc,
2124 sizeof(sat_blk_desc));
2128 rbuf[0] = output_len >> 8;
2130 rbuf[1] = output_len;
2135 rbuf[7] = sizeof(sat_blk_desc);
2137 memcpy(rbuf + 8, sat_blk_desc,
2138 sizeof(sat_blk_desc));
2144 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2145 /* "Invalid field in cbd" */
2149 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2150 /* "Saving parameters not supported" */
2155 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2156 * @args: device IDENTIFY data / SCSI command of interest.
2157 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2158 * @buflen: Response buffer length.
2160 * Simulate READ CAPACITY commands.
2163 * spin_lock_irqsave(host lock)
2166 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
2167 unsigned int buflen)
2174 if (ata_id_has_lba(args->id)) {
2175 if (ata_id_has_lba48(args->id))
2176 n_sectors = ata_id_u64(args->id, 100);
2178 n_sectors = ata_id_u32(args->id, 60);
2180 /* CHS default translation */
2181 n_sectors = args->id[1] * args->id[3] * args->id[6];
2183 if (ata_id_current_chs_valid(args->id))
2184 /* CHS current translation */
2185 n_sectors = ata_id_u32(args->id, 57);
2188 n_sectors--; /* ATA TotalUserSectors - 1 */
2190 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2191 if( n_sectors >= 0xffffffffULL )
2192 tmp = 0xffffffff ; /* Return max count on overflow */
2196 /* sector count, 32-bit */
2197 rbuf[0] = tmp >> (8 * 3);
2198 rbuf[1] = tmp >> (8 * 2);
2199 rbuf[2] = tmp >> (8 * 1);
2203 tmp = ATA_SECT_SIZE;
2208 /* sector count, 64-bit */
2209 tmp = n_sectors >> (8 * 4);
2210 rbuf[2] = tmp >> (8 * 3);
2211 rbuf[3] = tmp >> (8 * 2);
2212 rbuf[4] = tmp >> (8 * 1);
2215 rbuf[6] = tmp >> (8 * 3);
2216 rbuf[7] = tmp >> (8 * 2);
2217 rbuf[8] = tmp >> (8 * 1);
2221 tmp = ATA_SECT_SIZE;
2222 rbuf[12] = tmp >> 8;
2230 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2231 * @args: device IDENTIFY data / SCSI command of interest.
2232 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2233 * @buflen: Response buffer length.
2235 * Simulate REPORT LUNS command.
2238 * spin_lock_irqsave(host lock)
2241 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
2242 unsigned int buflen)
2245 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2251 * ata_scsi_set_sense - Set SCSI sense data and status
2252 * @cmd: SCSI request to be handled
2253 * @sk: SCSI-defined sense key
2254 * @asc: SCSI-defined additional sense code
2255 * @ascq: SCSI-defined additional sense code qualifier
2257 * Helper function that builds a valid fixed format, current
2258 * response code and the given sense key (sk), additional sense
2259 * code (asc) and additional sense code qualifier (ascq) with
2260 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and
2261 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
2267 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
2269 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
2271 cmd->sense_buffer[0] = 0x70; /* fixed format, current */
2272 cmd->sense_buffer[2] = sk;
2273 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */
2274 cmd->sense_buffer[12] = asc;
2275 cmd->sense_buffer[13] = ascq;
2279 * ata_scsi_badcmd - End a SCSI request with an error
2280 * @cmd: SCSI request to be handled
2281 * @done: SCSI command completion function
2282 * @asc: SCSI-defined additional sense code
2283 * @ascq: SCSI-defined additional sense code qualifier
2285 * Helper function that completes a SCSI command with
2286 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
2287 * and the specified additional sense codes.
2290 * spin_lock_irqsave(host lock)
2293 void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
2296 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
2301 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2303 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2304 /* FIXME: not quite right; we don't want the
2305 * translation of taskfile registers into
2306 * a sense descriptors, since that's only
2307 * correct for ATA, not ATAPI
2309 ata_gen_ata_desc_sense(qc);
2312 qc->scsidone(qc->scsicmd);
2316 /* is it pointless to prefer PIO for "safety reasons"? */
2317 static inline int ata_pio_use_silly(struct ata_port *ap)
2319 return (ap->flags & ATA_FLAG_PIO_DMA);
2322 static void atapi_request_sense(struct ata_queued_cmd *qc)
2324 struct ata_port *ap = qc->ap;
2325 struct scsi_cmnd *cmd = qc->scsicmd;
2327 DPRINTK("ATAPI request sense\n");
2329 /* FIXME: is this needed? */
2330 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
2332 ap->ops->tf_read(ap, &qc->tf);
2334 /* fill these in, for the case where they are -not- overwritten */
2335 cmd->sense_buffer[0] = 0x70;
2336 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2340 ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
2341 qc->dma_dir = DMA_FROM_DEVICE;
2343 memset(&qc->cdb, 0, qc->dev->cdb_len);
2344 qc->cdb[0] = REQUEST_SENSE;
2345 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2347 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2348 qc->tf.command = ATA_CMD_PACKET;
2350 if (ata_pio_use_silly(ap)) {
2351 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2352 qc->tf.feature |= ATAPI_PKT_DMA;
2354 qc->tf.protocol = ATA_PROT_ATAPI;
2355 qc->tf.lbam = (8 * 1024) & 0xff;
2356 qc->tf.lbah = (8 * 1024) >> 8;
2358 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2360 qc->complete_fn = atapi_sense_complete;
2367 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2369 struct scsi_cmnd *cmd = qc->scsicmd;
2370 unsigned int err_mask = qc->err_mask;
2372 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2374 /* handle completion from new EH */
2375 if (unlikely(qc->ap->ops->error_handler &&
2376 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2378 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2379 /* FIXME: not quite right; we don't want the
2380 * translation of taskfile registers into a
2381 * sense descriptors, since that's only
2382 * correct for ATA, not ATAPI
2384 ata_gen_ata_desc_sense(qc);
2387 /* SCSI EH automatically locks door if sdev->locked is
2388 * set. Sometimes door lock request continues to
2389 * fail, for example, when no media is present. This
2390 * creates a loop - SCSI EH issues door lock which
2391 * fails and gets invoked again to acquire sense data
2392 * for the failed command.
2394 * If door lock fails, always clear sdev->locked to
2395 * avoid this infinite loop.
2397 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2398 qc->dev->sdev->locked = 0;
2400 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2406 /* successful completion or old EH failure path */
2407 if (unlikely(err_mask & AC_ERR_DEV)) {
2408 cmd->result = SAM_STAT_CHECK_CONDITION;
2409 atapi_request_sense(qc);
2411 } else if (unlikely(err_mask)) {
2412 /* FIXME: not quite right; we don't want the
2413 * translation of taskfile registers into
2414 * a sense descriptors, since that's only
2415 * correct for ATA, not ATAPI
2417 ata_gen_ata_desc_sense(qc);
2419 u8 *scsicmd = cmd->cmnd;
2421 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2423 unsigned int buflen;
2425 buflen = ata_scsi_rbuf_get(cmd, &buf);
2427 /* ATAPI devices typically report zero for their SCSI version,
2428 * and sometimes deviate from the spec WRT response data
2429 * format. If SCSI version is reported as zero like normal,
2430 * then we make the following fixups: 1) Fake MMC-5 version,
2431 * to indicate to the Linux scsi midlayer this is a modern
2432 * device. 2) Ensure response data format / ATAPI information
2433 * are always correct.
2440 ata_scsi_rbuf_put(cmd, buf);
2443 cmd->result = SAM_STAT_GOOD;
2450 * atapi_xlat - Initialize PACKET taskfile
2451 * @qc: command structure to be initialized
2452 * @scsicmd: SCSI CDB associated with this PACKET command
2455 * spin_lock_irqsave(host lock)
2458 * Zero on success, non-zero on failure.
2461 static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
2463 struct scsi_cmnd *cmd = qc->scsicmd;
2464 struct ata_device *dev = qc->dev;
2465 int using_pio = (dev->flags & ATA_DFLAG_PIO);
2466 int nodata = (cmd->sc_data_direction == DMA_NONE);
2469 /* Check whether ATAPI DMA is safe */
2470 if (ata_check_atapi_dma(qc))
2473 memcpy(&qc->cdb, scsicmd, dev->cdb_len);
2475 qc->complete_fn = atapi_qc_complete;
2477 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2478 if (cmd->sc_data_direction == DMA_TO_DEVICE) {
2479 qc->tf.flags |= ATA_TFLAG_WRITE;
2480 DPRINTK("direction: write\n");
2483 qc->tf.command = ATA_CMD_PACKET;
2485 /* no data, or PIO data xfer */
2486 if (using_pio || nodata) {
2488 qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
2490 qc->tf.protocol = ATA_PROT_ATAPI;
2491 qc->tf.lbam = (8 * 1024) & 0xff;
2492 qc->tf.lbah = (8 * 1024) >> 8;
2497 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2498 qc->tf.feature |= ATAPI_PKT_DMA;
2500 if (atapi_dmadir && (cmd->sc_data_direction != DMA_TO_DEVICE))
2501 /* some SATA bridges need us to indicate data xfer direction */
2502 qc->tf.feature |= ATAPI_DMADIR;
2505 qc->nbytes = cmd->request_bufflen;
2510 static struct ata_device * ata_find_dev(struct ata_port *ap, int id)
2512 if (likely(id < ATA_MAX_DEVICES))
2513 return &ap->device[id];
2517 static struct ata_device * __ata_scsi_find_dev(struct ata_port *ap,
2518 const struct scsi_device *scsidev)
2520 /* skip commands not addressed to targets we simulate */
2521 if (unlikely(scsidev->channel || scsidev->lun))
2524 return ata_find_dev(ap, scsidev->id);
2528 * ata_scsi_dev_enabled - determine if device is enabled
2531 * Determine if commands should be sent to the specified device.
2534 * spin_lock_irqsave(host lock)
2537 * 0 if commands are not allowed / 1 if commands are allowed
2540 static int ata_scsi_dev_enabled(struct ata_device *dev)
2542 if (unlikely(!ata_dev_enabled(dev)))
2545 if (!atapi_enabled || (dev->ap->flags & ATA_FLAG_NO_ATAPI)) {
2546 if (unlikely(dev->class == ATA_DEV_ATAPI)) {
2547 ata_dev_printk(dev, KERN_WARNING,
2548 "WARNING: ATAPI is %s, device ignored.\n",
2549 atapi_enabled ? "not supported with this driver" : "disabled");
2558 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2559 * @ap: ATA port to which the device is attached
2560 * @scsidev: SCSI device from which we derive the ATA device
2562 * Given various information provided in struct scsi_cmnd,
2563 * map that onto an ATA bus, and using that mapping
2564 * determine which ata_device is associated with the
2565 * SCSI command to be sent.
2568 * spin_lock_irqsave(host lock)
2571 * Associated ATA device, or %NULL if not found.
2573 static struct ata_device *
2574 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2576 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2578 if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
2585 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2586 * @byte1: Byte 1 from pass-thru CDB.
2589 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2592 ata_scsi_map_proto(u8 byte1)
2594 switch((byte1 & 0x1e) >> 1) {
2595 case 3: /* Non-data */
2596 return ATA_PROT_NODATA;
2599 return ATA_PROT_DMA;
2601 case 4: /* PIO Data-in */
2602 case 5: /* PIO Data-out */
2603 return ATA_PROT_PIO;
2605 case 10: /* Device Reset */
2606 case 0: /* Hard Reset */
2608 case 2: /* Bus Idle */
2609 case 7: /* Packet */
2610 case 8: /* DMA Queued */
2611 case 9: /* Device Diagnostic */
2612 case 11: /* UDMA Data-in */
2613 case 12: /* UDMA Data-Out */
2614 case 13: /* FPDMA */
2615 default: /* Reserved */
2619 return ATA_PROT_UNKNOWN;
2623 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2624 * @qc: command structure to be initialized
2625 * @scsicmd: SCSI command to convert
2627 * Handles either 12 or 16-byte versions of the CDB.
2630 * Zero on success, non-zero on failure.
2633 ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
2635 struct ata_taskfile *tf = &(qc->tf);
2636 struct scsi_cmnd *cmd = qc->scsicmd;
2637 struct ata_device *dev = qc->dev;
2639 if ((tf->protocol = ata_scsi_map_proto(scsicmd[1])) == ATA_PROT_UNKNOWN)
2642 /* We may not issue DMA commands if no DMA mode is set */
2643 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2646 if (scsicmd[1] & 0xe0)
2647 /* PIO multi not supported yet */
2651 * 12 and 16 byte CDBs use different offsets to
2652 * provide the various register values.
2654 if (scsicmd[0] == ATA_16) {
2656 * 16-byte CDB - may contain extended commands.
2658 * If that is the case, copy the upper byte register values.
2660 if (scsicmd[1] & 0x01) {
2661 tf->hob_feature = scsicmd[3];
2662 tf->hob_nsect = scsicmd[5];
2663 tf->hob_lbal = scsicmd[7];
2664 tf->hob_lbam = scsicmd[9];
2665 tf->hob_lbah = scsicmd[11];
2666 tf->flags |= ATA_TFLAG_LBA48;
2668 tf->flags &= ~ATA_TFLAG_LBA48;
2671 * Always copy low byte, device and command registers.
2673 tf->feature = scsicmd[4];
2674 tf->nsect = scsicmd[6];
2675 tf->lbal = scsicmd[8];
2676 tf->lbam = scsicmd[10];
2677 tf->lbah = scsicmd[12];
2678 tf->device = scsicmd[13];
2679 tf->command = scsicmd[14];
2682 * 12-byte CDB - incapable of extended commands.
2684 tf->flags &= ~ATA_TFLAG_LBA48;
2686 tf->feature = scsicmd[3];
2687 tf->nsect = scsicmd[4];
2688 tf->lbal = scsicmd[5];
2689 tf->lbam = scsicmd[6];
2690 tf->lbah = scsicmd[7];
2691 tf->device = scsicmd[8];
2692 tf->command = scsicmd[9];
2695 * If slave is possible, enforce correct master/slave bit
2697 if (qc->ap->flags & ATA_FLAG_SLAVE_POSS)
2698 tf->device = qc->dev->devno ?
2699 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2702 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2703 * SET_FEATURES - XFER MODE must be preceded/succeeded
2704 * by an update to hardware-specific registers for each
2705 * controller (i.e. the reason for ->set_piomode(),
2706 * ->set_dmamode(), and ->post_set_mode() hooks).
2708 if ((tf->command == ATA_CMD_SET_FEATURES)
2709 && (tf->feature == SETFEATURES_XFER))
2713 * Set flags so that all registers will be written,
2714 * and pass on write indication (used for PIO/DMA
2717 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2719 if (cmd->sc_data_direction == DMA_TO_DEVICE)
2720 tf->flags |= ATA_TFLAG_WRITE;
2723 * Set transfer length.
2725 * TODO: find out if we need to do more here to
2726 * cover scatter/gather case.
2728 qc->nsect = cmd->request_bufflen / ATA_SECT_SIZE;
2730 /* request result TF */
2731 qc->flags |= ATA_QCFLAG_RESULT_TF;
2736 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x00);
2737 /* "Invalid field in cdb" */
2742 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2744 * @cmd: SCSI command opcode to consider
2746 * Look up the SCSI command given, and determine whether the
2747 * SCSI command is to be translated or simulated.
2750 * Pointer to translation function if possible, %NULL if not.
2753 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2763 return ata_scsi_rw_xlat;
2765 case SYNCHRONIZE_CACHE:
2766 if (ata_try_flush_cache(dev))
2767 return ata_scsi_flush_xlat;
2772 return ata_scsi_verify_xlat;
2776 return ata_scsi_pass_thru;
2779 return ata_scsi_start_stop_xlat;
2786 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2787 * @ap: ATA port to which the command was being sent
2788 * @cmd: SCSI command to dump
2790 * Prints the contents of a SCSI command via printk().
2793 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2794 struct scsi_cmnd *cmd)
2797 struct scsi_device *scsidev = cmd->device;
2798 u8 *scsicmd = cmd->cmnd;
2800 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2802 scsidev->channel, scsidev->id, scsidev->lun,
2803 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2804 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2809 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *cmd,
2810 void (*done)(struct scsi_cmnd *),
2811 struct ata_device *dev)
2815 if (dev->class == ATA_DEV_ATA) {
2816 ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
2820 rc = ata_scsi_translate(dev, cmd, done, xlat_func);
2822 ata_scsi_simulate(dev, cmd, done);
2824 rc = ata_scsi_translate(dev, cmd, done, atapi_xlat);
2830 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
2831 * @cmd: SCSI command to be sent
2832 * @done: Completion function, called when command is complete
2834 * In some cases, this function translates SCSI commands into
2835 * ATA taskfiles, and queues the taskfiles to be sent to
2836 * hardware. In other cases, this function simulates a
2837 * SCSI device by evaluating and responding to certain
2838 * SCSI commands. This creates the overall effect of
2839 * ATA and ATAPI devices appearing as SCSI devices.
2842 * Releases scsi-layer-held lock, and obtains host lock.
2845 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
2848 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
2850 struct ata_port *ap;
2851 struct ata_device *dev;
2852 struct scsi_device *scsidev = cmd->device;
2853 struct Scsi_Host *shost = scsidev->host;
2856 ap = ata_shost_to_port(shost);
2858 spin_unlock(shost->host_lock);
2859 spin_lock(ap->lock);
2861 ata_scsi_dump_cdb(ap, cmd);
2863 dev = ata_scsi_find_dev(ap, scsidev);
2865 rc = __ata_scsi_queuecmd(cmd, done, dev);
2867 cmd->result = (DID_BAD_TARGET << 16);
2871 spin_unlock(ap->lock);
2872 spin_lock(shost->host_lock);
2877 * ata_scsi_simulate - simulate SCSI command on ATA device
2878 * @dev: the target device
2879 * @cmd: SCSI command being sent to device.
2880 * @done: SCSI command completion function.
2882 * Interprets and directly executes a select list of SCSI commands
2883 * that can be handled internally.
2886 * spin_lock_irqsave(host lock)
2889 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
2890 void (*done)(struct scsi_cmnd *))
2892 struct ata_scsi_args args;
2893 const u8 *scsicmd = cmd->cmnd;
2900 switch(scsicmd[0]) {
2901 /* no-op's, complete with success */
2902 case SYNCHRONIZE_CACHE:
2906 case TEST_UNIT_READY:
2907 case FORMAT_UNIT: /* FIXME: correct? */
2908 case SEND_DIAGNOSTIC: /* FIXME: correct? */
2909 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2913 if (scsicmd[1] & 2) /* is CmdDt set? */
2914 ata_scsi_invalid_field(cmd, done);
2915 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
2916 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
2917 else if (scsicmd[2] == 0x00)
2918 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
2919 else if (scsicmd[2] == 0x80)
2920 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
2921 else if (scsicmd[2] == 0x83)
2922 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
2924 ata_scsi_invalid_field(cmd, done);
2929 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
2932 case MODE_SELECT: /* unconditionally return */
2933 case MODE_SELECT_10: /* bad-field-in-cdb */
2934 ata_scsi_invalid_field(cmd, done);
2938 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2941 case SERVICE_ACTION_IN:
2942 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
2943 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2945 ata_scsi_invalid_field(cmd, done);
2949 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
2952 /* mandatory commands we haven't implemented yet */
2955 /* all other commands */
2957 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
2958 /* "Invalid command operation code" */
2964 void ata_scsi_scan_host(struct ata_port *ap)
2968 if (ap->flags & ATA_FLAG_DISABLED)
2971 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2972 struct ata_device *dev = &ap->device[i];
2973 struct scsi_device *sdev;
2975 if (!ata_dev_enabled(dev) || dev->sdev)
2978 sdev = __scsi_add_device(ap->scsi_host, 0, i, 0, NULL);
2979 if (!IS_ERR(sdev)) {
2981 scsi_device_put(sdev);
2987 * ata_scsi_offline_dev - offline attached SCSI device
2988 * @dev: ATA device to offline attached SCSI device for
2990 * This function is called from ata_eh_hotplug() and responsible
2991 * for taking the SCSI device attached to @dev offline. This
2992 * function is called with host lock which protects dev->sdev
2996 * spin_lock_irqsave(host lock)
2999 * 1 if attached SCSI device exists, 0 otherwise.
3001 int ata_scsi_offline_dev(struct ata_device *dev)
3004 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3011 * ata_scsi_remove_dev - remove attached SCSI device
3012 * @dev: ATA device to remove attached SCSI device for
3014 * This function is called from ata_eh_scsi_hotplug() and
3015 * responsible for removing the SCSI device attached to @dev.
3018 * Kernel thread context (may sleep).
3020 static void ata_scsi_remove_dev(struct ata_device *dev)
3022 struct ata_port *ap = dev->ap;
3023 struct scsi_device *sdev;
3024 unsigned long flags;
3026 /* Alas, we need to grab scan_mutex to ensure SCSI device
3027 * state doesn't change underneath us and thus
3028 * scsi_device_get() always succeeds. The mutex locking can
3029 * be removed if there is __scsi_device_get() interface which
3030 * increments reference counts regardless of device state.
3032 mutex_lock(&ap->scsi_host->scan_mutex);
3033 spin_lock_irqsave(ap->lock, flags);
3035 /* clearing dev->sdev is protected by host lock */
3040 /* If user initiated unplug races with us, sdev can go
3041 * away underneath us after the host lock and
3042 * scan_mutex are released. Hold onto it.
3044 if (scsi_device_get(sdev) == 0) {
3045 /* The following ensures the attached sdev is
3046 * offline on return from ata_scsi_offline_dev()
3047 * regardless it wins or loses the race
3048 * against this function.
3050 scsi_device_set_state(sdev, SDEV_OFFLINE);
3057 spin_unlock_irqrestore(ap->lock, flags);
3058 mutex_unlock(&ap->scsi_host->scan_mutex);
3061 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3062 sdev->sdev_gendev.bus_id);
3064 scsi_remove_device(sdev);
3065 scsi_device_put(sdev);
3070 * ata_scsi_hotplug - SCSI part of hotplug
3071 * @data: Pointer to ATA port to perform SCSI hotplug on
3073 * Perform SCSI part of hotplug. It's executed from a separate
3074 * workqueue after EH completes. This is necessary because SCSI
3075 * hot plugging requires working EH and hot unplugging is
3076 * synchronized with hot plugging with a mutex.
3079 * Kernel thread context (may sleep).
3081 void ata_scsi_hotplug(void *data)
3083 struct ata_port *ap = data;
3086 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3087 DPRINTK("ENTER/EXIT - unloading\n");
3093 /* unplug detached devices */
3094 for (i = 0; i < ATA_MAX_DEVICES; i++) {
3095 struct ata_device *dev = &ap->device[i];
3096 unsigned long flags;
3098 if (!(dev->flags & ATA_DFLAG_DETACHED))
3101 spin_lock_irqsave(ap->lock, flags);
3102 dev->flags &= ~ATA_DFLAG_DETACHED;
3103 spin_unlock_irqrestore(ap->lock, flags);
3105 ata_scsi_remove_dev(dev);
3108 /* scan for new ones */
3109 ata_scsi_scan_host(ap);
3111 /* If we scanned while EH was in progress, scan would have
3112 * failed silently. Requeue if there are enabled but
3113 * unattached devices.
3115 for (i = 0; i < ATA_MAX_DEVICES; i++) {
3116 struct ata_device *dev = &ap->device[i];
3117 if (ata_dev_enabled(dev) && !dev->sdev) {
3118 queue_delayed_work(ata_aux_wq, &ap->hotplug_task, HZ);
3127 * ata_scsi_user_scan - indication for user-initiated bus scan
3128 * @shost: SCSI host to scan
3129 * @channel: Channel to scan
3133 * This function is called when user explicitly requests bus
3134 * scan. Set probe pending flag and invoke EH.
3137 * SCSI layer (we don't care)
3142 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3143 unsigned int id, unsigned int lun)
3145 struct ata_port *ap = ata_shost_to_port(shost);
3146 unsigned long flags;
3149 if (!ap->ops->error_handler)
3152 if ((channel != SCAN_WILD_CARD && channel != 0) ||
3153 (lun != SCAN_WILD_CARD && lun != 0))
3156 spin_lock_irqsave(ap->lock, flags);
3158 if (id == SCAN_WILD_CARD) {
3159 ap->eh_info.probe_mask |= (1 << ATA_MAX_DEVICES) - 1;
3160 ap->eh_info.action |= ATA_EH_SOFTRESET;
3162 struct ata_device *dev = ata_find_dev(ap, id);
3165 ap->eh_info.probe_mask |= 1 << dev->devno;
3166 ap->eh_info.action |= ATA_EH_SOFTRESET;
3167 ap->eh_info.flags |= ATA_EHI_RESUME_LINK;
3173 ata_port_schedule_eh(ap);
3174 spin_unlock_irqrestore(ap->lock, flags);
3175 ata_port_wait_eh(ap);
3177 spin_unlock_irqrestore(ap->lock, flags);
3183 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3184 * @data: Pointer to ATA port to perform scsi_rescan_device()
3186 * After ATA pass thru (SAT) commands are executed successfully,
3187 * libata need to propagate the changes to SCSI layer. This
3188 * function must be executed from ata_aux_wq such that sdev
3189 * attach/detach don't race with rescan.
3192 * Kernel thread context (may sleep).
3194 void ata_scsi_dev_rescan(void *data)
3196 struct ata_port *ap = data;
3197 struct ata_device *dev;
3200 for (i = 0; i < ATA_MAX_DEVICES; i++) {
3201 dev = &ap->device[i];
3203 if (ata_dev_enabled(dev) && dev->sdev)
3204 scsi_rescan_device(&(dev->sdev->sdev_gendev));
3209 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3210 * @host: ATA host container for all SAS ports
3211 * @port_info: Information from low-level host driver
3212 * @shost: SCSI host that the scsi device is attached to
3215 * PCI/etc. bus probe sem.
3218 * ata_port pointer on success / NULL on failure.
3221 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3222 struct ata_port_info *port_info,
3223 struct Scsi_Host *shost)
3225 struct ata_port *ap = kzalloc(sizeof(*ap), GFP_KERNEL);
3226 struct ata_probe_ent *ent;
3231 ent = ata_probe_ent_alloc(host->dev, port_info);
3237 ata_port_init(ap, host, ent, 0);
3238 ap->lock = shost->host_lock;
3242 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3245 * ata_sas_port_start - Set port up for dma.
3246 * @ap: Port to initialize
3248 * Called just after data structures for each port are
3249 * initialized. Allocates DMA pad.
3251 * May be used as the port_start() entry in ata_port_operations.
3254 * Inherited from caller.
3256 int ata_sas_port_start(struct ata_port *ap)
3258 return ata_pad_alloc(ap, ap->dev);
3260 EXPORT_SYMBOL_GPL(ata_sas_port_start);
3263 * ata_port_stop - Undo ata_sas_port_start()
3264 * @ap: Port to shut down
3266 * Frees the DMA pad.
3268 * May be used as the port_stop() entry in ata_port_operations.
3271 * Inherited from caller.
3274 void ata_sas_port_stop(struct ata_port *ap)
3276 ata_pad_free(ap, ap->dev);
3278 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3281 * ata_sas_port_init - Initialize a SATA device
3282 * @ap: SATA port to initialize
3285 * PCI/etc. bus probe sem.
3288 * Zero on success, non-zero on error.
3291 int ata_sas_port_init(struct ata_port *ap)
3293 int rc = ap->ops->port_start(ap);
3296 rc = ata_bus_probe(ap);
3300 EXPORT_SYMBOL_GPL(ata_sas_port_init);
3303 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3304 * @ap: SATA port to destroy
3308 void ata_sas_port_destroy(struct ata_port *ap)
3310 ap->ops->port_stop(ap);
3313 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3316 * ata_sas_slave_configure - Default slave_config routine for libata devices
3317 * @sdev: SCSI device to configure
3318 * @ap: ATA port to which SCSI device is attached
3324 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3326 ata_scsi_sdev_config(sdev);
3327 ata_scsi_dev_config(sdev, ap->device);
3330 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3333 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3334 * @cmd: SCSI command to be sent
3335 * @done: Completion function, called when command is complete
3336 * @ap: ATA port to which the command is being sent
3339 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3343 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3344 struct ata_port *ap)
3348 ata_scsi_dump_cdb(ap, cmd);
3350 if (likely(ata_scsi_dev_enabled(ap->device)))
3351 rc = __ata_scsi_queuecmd(cmd, done, ap->device);
3353 cmd->result = (DID_BAD_TARGET << 16);
3358 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);