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_eh.h>
42 #include <scsi/scsi_device.h>
43 #include <scsi/scsi_request.h>
44 #include <scsi/scsi_transport.h>
45 #include <linux/libata.h>
46 #include <linux/hdreg.h>
47 #include <asm/uaccess.h>
51 #define SECTOR_SIZE 512
53 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
54 static struct ata_device *
55 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev);
56 enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
58 #define RW_RECOVERY_MPAGE 0x1
59 #define RW_RECOVERY_MPAGE_LEN 12
60 #define CACHE_MPAGE 0x8
61 #define CACHE_MPAGE_LEN 20
62 #define CONTROL_MPAGE 0xa
63 #define CONTROL_MPAGE_LEN 12
64 #define ALL_MPAGES 0x3f
65 #define ALL_SUB_MPAGES 0xff
68 static const u8 def_rw_recovery_mpage[] = {
70 RW_RECOVERY_MPAGE_LEN - 2,
71 (1 << 7) | /* AWRE, sat-r06 say it shall be 0 */
72 (1 << 6), /* ARRE (auto read reallocation) */
73 0, /* read retry count */
75 0, /* write retry count */
79 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
82 0, /* contains WCE, needs to be 0 for logic */
83 0, 0, 0, 0, 0, 0, 0, 0, 0,
84 0, /* contains DRA, needs to be 0 for logic */
88 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
90 CONTROL_MPAGE_LEN - 2,
91 2, /* DSENSE=0, GLTSD=1 */
92 0, /* [QAM+QERR may be 1, see 05-359r1] */
93 0, 0, 0, 0, 0xff, 0xff,
94 0, 30 /* extended self test time, see 05-359r1 */
98 * libata transport template. libata doesn't do real transport stuff.
99 * It just needs the eh_timed_out hook.
101 struct scsi_transport_template ata_scsi_transport_template = {
102 .eh_timed_out = ata_scsi_timed_out,
106 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
107 void (*done)(struct scsi_cmnd *))
109 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
110 /* "Invalid field in cbd" */
115 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
116 * @sdev: SCSI device for which BIOS geometry is to be determined
117 * @bdev: block device associated with @sdev
118 * @capacity: capacity of SCSI device
119 * @geom: location to which geometry will be output
121 * Generic bios head/sector/cylinder calculator
122 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
123 * mapping. Some situations may arise where the disk is not
124 * bootable if this is not used.
127 * Defined by the SCSI layer. We don't really care.
132 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
133 sector_t capacity, int geom[])
137 sector_div(capacity, 255*63);
144 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
145 * @scsidev: Device to which we are issuing command
146 * @arg: User provided data for issuing command
149 * Defined by the SCSI layer. We don't really care.
152 * Zero on success, negative errno on error.
155 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
158 u8 scsi_cmd[MAX_COMMAND_SIZE];
159 u8 args[4], *argbuf = NULL;
161 struct scsi_sense_hdr sshdr;
162 enum dma_data_direction data_dir;
167 if (copy_from_user(args, arg, sizeof(args)))
170 memset(scsi_cmd, 0, sizeof(scsi_cmd));
173 argsize = SECTOR_SIZE * args[3];
174 argbuf = kmalloc(argsize, GFP_KERNEL);
175 if (argbuf == NULL) {
180 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
181 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
182 block count in sector count field */
183 data_dir = DMA_FROM_DEVICE;
185 scsi_cmd[1] = (3 << 1); /* Non-data */
186 /* scsi_cmd[2] is already 0 -- no off.line, cc, or data xfer */
190 scsi_cmd[0] = ATA_16;
192 scsi_cmd[4] = args[2];
193 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
194 scsi_cmd[6] = args[3];
195 scsi_cmd[8] = args[1];
199 scsi_cmd[6] = args[1];
201 scsi_cmd[14] = args[0];
203 /* Good values for timeout and retries? Values below
204 from scsi_ioctl_send_command() for default case... */
205 if (scsi_execute_req(scsidev, scsi_cmd, data_dir, argbuf, argsize,
206 &sshdr, (10*HZ), 5)) {
211 /* Need code to retrieve data from check condition? */
214 && copy_to_user(arg + sizeof(args), argbuf, argsize))
224 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
225 * @scsidev: Device to which we are issuing command
226 * @arg: User provided data for issuing command
229 * Defined by the SCSI layer. We don't really care.
232 * Zero on success, negative errno on error.
234 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
237 u8 scsi_cmd[MAX_COMMAND_SIZE];
239 struct scsi_sense_hdr sshdr;
244 if (copy_from_user(args, arg, sizeof(args)))
247 memset(scsi_cmd, 0, sizeof(scsi_cmd));
248 scsi_cmd[0] = ATA_16;
249 scsi_cmd[1] = (3 << 1); /* Non-data */
250 /* scsi_cmd[2] is already 0 -- no off.line, cc, or data xfer */
251 scsi_cmd[4] = args[1];
252 scsi_cmd[6] = args[2];
253 scsi_cmd[8] = args[3];
254 scsi_cmd[10] = args[4];
255 scsi_cmd[12] = args[5];
256 scsi_cmd[14] = args[0];
258 /* Good values for timeout and retries? Values below
259 from scsi_ioctl_send_command() for default case... */
260 if (scsi_execute_req(scsidev, scsi_cmd, DMA_NONE, NULL, 0, &sshdr,
264 /* Need code to retrieve data from check condition? */
268 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
270 int val = -EINVAL, rc = -EINVAL;
273 case ATA_IOC_GET_IO32:
275 if (copy_to_user(arg, &val, 1))
279 case ATA_IOC_SET_IO32:
280 val = (unsigned long) arg;
286 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
288 return ata_cmd_ioctl(scsidev, arg);
290 case HDIO_DRIVE_TASK:
291 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
293 return ata_task_ioctl(scsidev, arg);
304 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
305 * @ap: ATA port to which the new command is attached
306 * @dev: ATA device to which the new command is attached
307 * @cmd: SCSI command that originated this ATA command
308 * @done: SCSI command completion function
310 * Obtain a reference to an unused ata_queued_cmd structure,
311 * which is the basic libata structure representing a single
312 * ATA command sent to the hardware.
314 * If a command was available, fill in the SCSI-specific
315 * portions of the structure with information on the
319 * spin_lock_irqsave(host_set lock)
322 * Command allocated, or %NULL if none available.
324 struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap,
325 struct ata_device *dev,
326 struct scsi_cmnd *cmd,
327 void (*done)(struct scsi_cmnd *))
329 struct ata_queued_cmd *qc;
331 qc = ata_qc_new_init(ap, dev);
337 qc->__sg = (struct scatterlist *) cmd->request_buffer;
338 qc->n_elem = cmd->use_sg;
340 qc->__sg = &qc->sgent;
344 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
352 * ata_dump_status - user friendly display of error info
353 * @id: id of the port in question
354 * @tf: ptr to filled out taskfile
356 * Decode and dump the ATA error/status registers for the user so
357 * that they have some idea what really happened at the non
358 * make-believe layer.
361 * inherited from caller
363 void ata_dump_status(unsigned id, struct ata_taskfile *tf)
365 u8 stat = tf->command, err = tf->feature;
367 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
368 if (stat & ATA_BUSY) {
369 printk("Busy }\n"); /* Data is not valid in this case */
371 if (stat & 0x40) printk("DriveReady ");
372 if (stat & 0x20) printk("DeviceFault ");
373 if (stat & 0x10) printk("SeekComplete ");
374 if (stat & 0x08) printk("DataRequest ");
375 if (stat & 0x04) printk("CorrectedError ");
376 if (stat & 0x02) printk("Index ");
377 if (stat & 0x01) printk("Error ");
381 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
382 if (err & 0x04) printk("DriveStatusError ");
384 if (err & 0x04) printk("BadCRC ");
385 else printk("Sector ");
387 if (err & 0x40) printk("UncorrectableError ");
388 if (err & 0x10) printk("SectorIdNotFound ");
389 if (err & 0x02) printk("TrackZeroNotFound ");
390 if (err & 0x01) printk("AddrMarkNotFound ");
396 int ata_scsi_device_resume(struct scsi_device *sdev)
398 struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];
399 struct ata_device *dev = &ap->device[sdev->id];
401 return ata_device_resume(ap, dev);
404 int ata_scsi_device_suspend(struct scsi_device *sdev, pm_message_t state)
406 struct ata_port *ap = (struct ata_port *) &sdev->host->hostdata[0];
407 struct ata_device *dev = &ap->device[sdev->id];
409 return ata_device_suspend(ap, dev, state);
413 * ata_to_sense_error - convert ATA error to SCSI error
414 * @id: ATA device number
415 * @drv_stat: value contained in ATA status register
416 * @drv_err: value contained in ATA error register
417 * @sk: the sense key we'll fill out
418 * @asc: the additional sense code we'll fill out
419 * @ascq: the additional sense code qualifier we'll fill out
421 * Converts an ATA error into a SCSI error. Fill out pointers to
422 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
423 * format sense blocks.
426 * spin_lock_irqsave(host_set lock)
428 void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
433 /* Based on the 3ware driver translation table */
434 static const unsigned char sense_table[][4] = {
436 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
438 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
440 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
441 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
442 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
443 /* MC|ID|ABRT|TRK0|MARK */
444 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
446 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
447 /* Bad address mark */
448 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
450 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
452 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
453 /* Media change request */
454 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
456 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
458 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
460 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
461 /* BBD - block marked bad */
462 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
463 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
465 static const unsigned char stat_table[][4] = {
466 /* Must be first because BUSY means no other bits valid */
467 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
468 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
469 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
470 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
471 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
475 * Is this an error we can process/parse
477 if (drv_stat & ATA_BUSY) {
478 drv_err = 0; /* Ignore the err bits, they're invalid */
482 /* Look for drv_err */
483 for (i = 0; sense_table[i][0] != 0xFF; i++) {
484 /* Look for best matches first */
485 if ((sense_table[i][0] & drv_err) ==
487 *sk = sense_table[i][1];
488 *asc = sense_table[i][2];
489 *ascq = sense_table[i][3];
493 /* No immediate match */
494 printk(KERN_WARNING "ata%u: no sense translation for "
495 "error 0x%02x\n", id, drv_err);
498 /* Fall back to interpreting status bits */
499 for (i = 0; stat_table[i][0] != 0xFF; i++) {
500 if (stat_table[i][0] & drv_stat) {
501 *sk = stat_table[i][1];
502 *asc = stat_table[i][2];
503 *ascq = stat_table[i][3];
507 /* No error? Undecoded? */
508 printk(KERN_WARNING "ata%u: no sense translation for status: 0x%02x\n",
511 /* We need a sensible error return here, which is tricky, and one
512 that won't cause people to do things like return a disk wrongly */
513 *sk = ABORTED_COMMAND;
518 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x to "
519 "SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n", id, drv_stat, drv_err,
525 * ata_gen_ata_desc_sense - Generate check condition sense block.
526 * @qc: Command that completed.
528 * This function is specific to the ATA descriptor format sense
529 * block specified for the ATA pass through commands. Regardless
530 * of whether the command errored or not, return a sense
531 * block. Copy all controller registers into the sense
532 * block. Clear sense key, ASC & ASCQ if there is no error.
535 * spin_lock_irqsave(host_set lock)
537 void ata_gen_ata_desc_sense(struct ata_queued_cmd *qc)
539 struct scsi_cmnd *cmd = qc->scsicmd;
540 struct ata_taskfile *tf = &qc->tf;
541 unsigned char *sb = cmd->sense_buffer;
542 unsigned char *desc = sb + 8;
544 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
546 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
549 * Use ata_to_sense_error() to map status register bits
550 * onto sense key, asc & ascq.
553 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
554 ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
555 &sb[1], &sb[2], &sb[3]);
560 * Sense data is current and format is descriptor.
567 * Set length of additional sense data.
568 * Since we only populate descriptor 0, the total
569 * length is the same (fixed) length as descriptor 0.
571 desc[1] = sb[7] = 14;
574 * Copy registers into sense buffer.
577 desc[3] = tf->feature; /* == error reg */
582 desc[12] = tf->device;
583 desc[13] = tf->command; /* == status reg */
586 * Fill in Extend bit, and the high order bytes
589 if (tf->flags & ATA_TFLAG_LBA48) {
591 desc[4] = tf->hob_nsect;
592 desc[6] = tf->hob_lbal;
593 desc[8] = tf->hob_lbam;
594 desc[10] = tf->hob_lbah;
599 * ata_gen_fixed_sense - generate a SCSI fixed sense block
600 * @qc: Command that we are erroring out
602 * Leverage ata_to_sense_error() to give us the codes. Fit our
603 * LBA in here if there's room.
606 * inherited from caller
608 void ata_gen_fixed_sense(struct ata_queued_cmd *qc)
610 struct scsi_cmnd *cmd = qc->scsicmd;
611 struct ata_taskfile *tf = &qc->tf;
612 unsigned char *sb = cmd->sense_buffer;
614 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
616 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
619 * Use ata_to_sense_error() to map status register bits
620 * onto sense key, asc & ascq.
623 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
624 ata_to_sense_error(qc->ap->id, tf->command, tf->feature,
625 &sb[2], &sb[12], &sb[13]);
632 if (tf->flags & ATA_TFLAG_LBA48) {
633 /* TODO: find solution for LBA48 descriptors */
636 else if (tf->flags & ATA_TFLAG_LBA) {
637 /* A small (28b) LBA will fit in the 32b info field */
638 sb[0] |= 0x80; /* set valid bit */
639 sb[3] = tf->device & 0x0f;
650 static void ata_scsi_sdev_config(struct scsi_device *sdev)
652 sdev->use_10_for_rw = 1;
653 sdev->use_10_for_ms = 1;
656 static void ata_scsi_dev_config(struct scsi_device *sdev,
657 struct ata_device *dev)
659 unsigned int max_sectors;
661 /* TODO: 2048 is an arbitrary number, not the
662 * hardware maximum. This should be increased to
663 * 65534 when Jens Axboe's patch for dynamically
664 * determining max_sectors is merged.
666 max_sectors = ATA_MAX_SECTORS;
667 if (dev->flags & ATA_DFLAG_LBA48)
669 if (dev->max_sectors)
670 max_sectors = dev->max_sectors;
672 blk_queue_max_sectors(sdev->request_queue, max_sectors);
675 * SATA DMA transfers must be multiples of 4 byte, so
676 * we need to pad ATAPI transfers using an extra sg.
677 * Decrement max hw segments accordingly.
679 if (dev->class == ATA_DEV_ATAPI) {
680 request_queue_t *q = sdev->request_queue;
681 blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
686 * ata_scsi_slave_config - Set SCSI device attributes
687 * @sdev: SCSI device to examine
689 * This is called before we actually start reading
690 * and writing to the device, to configure certain
691 * SCSI mid-layer behaviors.
694 * Defined by SCSI layer. We don't really care.
697 int ata_scsi_slave_config(struct scsi_device *sdev)
699 ata_scsi_sdev_config(sdev);
701 blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
703 if (sdev->id < ATA_MAX_DEVICES) {
705 struct ata_device *dev;
707 ap = (struct ata_port *) &sdev->host->hostdata[0];
708 dev = &ap->device[sdev->id];
710 ata_scsi_dev_config(sdev, dev);
713 return 0; /* scsi layer doesn't check return value, sigh */
717 * ata_scsi_timed_out - SCSI layer time out callback
718 * @cmd: timed out SCSI command
720 * Handles SCSI layer timeout. We race with normal completion of
721 * the qc for @cmd. If the qc is already gone, we lose and let
722 * the scsi command finish (EH_HANDLED). Otherwise, the qc has
723 * timed out and EH should be invoked. Prevent ata_qc_complete()
724 * from finishing it by setting EH_SCHEDULED and return
728 * Called from timer context
731 * EH_HANDLED or EH_NOT_HANDLED
733 enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
735 struct Scsi_Host *host = cmd->device->host;
736 struct ata_port *ap = (struct ata_port *) &host->hostdata[0];
738 struct ata_queued_cmd *qc;
739 enum scsi_eh_timer_return ret = EH_HANDLED;
743 spin_lock_irqsave(&ap->host_set->lock, flags);
744 qc = ata_qc_from_tag(ap, ap->active_tag);
746 WARN_ON(qc->scsicmd != cmd);
747 qc->flags |= ATA_QCFLAG_EH_SCHEDULED;
748 qc->err_mask |= AC_ERR_TIMEOUT;
749 ret = EH_NOT_HANDLED;
751 spin_unlock_irqrestore(&ap->host_set->lock, flags);
753 DPRINTK("EXIT, ret=%d\n", ret);
758 * ata_scsi_error - SCSI layer error handler callback
759 * @host: SCSI host on which error occurred
761 * Handles SCSI-layer-thrown error events.
764 * Inherited from SCSI layer (none, can sleep)
770 int ata_scsi_error(struct Scsi_Host *host)
772 struct ata_port *ap = (struct ata_port *)&host->hostdata[0];
776 /* synchronize with IRQ handler and port task */
777 spin_unlock_wait(&ap->host_set->lock);
778 ata_port_flush_task(ap);
780 WARN_ON(ata_qc_from_tag(ap, ap->active_tag) == NULL);
782 ap->ops->eng_timeout(ap);
784 WARN_ON(host->host_failed || !list_empty(&host->eh_cmd_q));
786 scsi_eh_flush_done_q(&ap->eh_done_q);
792 static void ata_eh_scsidone(struct scsi_cmnd *scmd)
797 static void __ata_eh_qc_complete(struct ata_queued_cmd *qc)
799 struct ata_port *ap = qc->ap;
800 struct scsi_cmnd *scmd = qc->scsicmd;
803 spin_lock_irqsave(&ap->host_set->lock, flags);
804 qc->scsidone = ata_eh_scsidone;
805 __ata_qc_complete(qc);
806 WARN_ON(ata_tag_valid(qc->tag));
807 spin_unlock_irqrestore(&ap->host_set->lock, flags);
809 scsi_eh_finish_cmd(scmd, &ap->eh_done_q);
813 * ata_eh_qc_complete - Complete an active ATA command from EH
814 * @qc: Command to complete
816 * Indicate to the mid and upper layers that an ATA command has
817 * completed. To be used from EH.
819 void ata_eh_qc_complete(struct ata_queued_cmd *qc)
821 struct scsi_cmnd *scmd = qc->scsicmd;
822 scmd->retries = scmd->allowed;
823 __ata_eh_qc_complete(qc);
827 * ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
828 * @qc: Command to retry
830 * Indicate to the mid and upper layers that an ATA command
831 * should be retried. To be used from EH.
833 * SCSI midlayer limits the number of retries to scmd->allowed.
834 * scmd->retries is decremented for commands which get retried
835 * due to unrelated failures (qc->err_mask is zero).
837 void ata_eh_qc_retry(struct ata_queued_cmd *qc)
839 struct scsi_cmnd *scmd = qc->scsicmd;
840 if (!qc->err_mask && scmd->retries)
842 __ata_eh_qc_complete(qc);
846 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
847 * @qc: Storage for translated ATA taskfile
848 * @scsicmd: SCSI command to translate
850 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
851 * (to start). Perhaps these commands should be preceded by
852 * CHECK POWER MODE to see what power mode the device is already in.
853 * [See SAT revision 5 at www.t10.org]
856 * spin_lock_irqsave(host_set lock)
859 * Zero on success, non-zero on error.
862 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
865 struct ata_taskfile *tf = &qc->tf;
867 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
868 tf->protocol = ATA_PROT_NODATA;
869 if (scsicmd[1] & 0x1) {
870 ; /* ignore IMMED bit, violates sat-r05 */
872 if (scsicmd[4] & 0x2)
873 goto invalid_fld; /* LOEJ bit set not supported */
874 if (((scsicmd[4] >> 4) & 0xf) != 0)
875 goto invalid_fld; /* power conditions not supported */
876 if (scsicmd[4] & 0x1) {
877 tf->nsect = 1; /* 1 sector, lba=0 */
879 if (qc->dev->flags & ATA_DFLAG_LBA) {
880 qc->tf.flags |= ATA_TFLAG_LBA;
885 tf->device |= ATA_LBA;
888 tf->lbal = 0x1; /* sect */
889 tf->lbam = 0x0; /* cyl low */
890 tf->lbah = 0x0; /* cyl high */
893 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
895 tf->nsect = 0; /* time period value (0 implies now) */
896 tf->command = ATA_CMD_STANDBY;
897 /* Consider: ATA STANDBY IMMEDIATE command */
900 * Standby and Idle condition timers could be implemented but that
901 * would require libata to implement the Power condition mode page
902 * and allow the user to change it. Changing mode pages requires
903 * MODE SELECT to be implemented.
909 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
910 /* "Invalid field in cbd" */
916 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
917 * @qc: Storage for translated ATA taskfile
918 * @scsicmd: SCSI command to translate (ignored)
920 * Sets up an ATA taskfile to issue FLUSH CACHE or
924 * spin_lock_irqsave(host_set lock)
927 * Zero on success, non-zero on error.
930 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
932 struct ata_taskfile *tf = &qc->tf;
934 tf->flags |= ATA_TFLAG_DEVICE;
935 tf->protocol = ATA_PROT_NODATA;
937 if ((qc->dev->flags & ATA_DFLAG_LBA48) &&
938 (ata_id_has_flush_ext(qc->dev->id)))
939 tf->command = ATA_CMD_FLUSH_EXT;
941 tf->command = ATA_CMD_FLUSH;
947 * scsi_6_lba_len - Get LBA and transfer length
948 * @scsicmd: SCSI command to translate
950 * Calculate LBA and transfer length for 6-byte commands.
954 * @plen: the transfer length
957 static void scsi_6_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
962 VPRINTK("six-byte command\n");
964 lba |= ((u64)scsicmd[2]) << 8;
965 lba |= ((u64)scsicmd[3]);
967 len |= ((u32)scsicmd[4]);
974 * scsi_10_lba_len - Get LBA and transfer length
975 * @scsicmd: SCSI command to translate
977 * Calculate LBA and transfer length for 10-byte commands.
981 * @plen: the transfer length
984 static void scsi_10_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
989 VPRINTK("ten-byte command\n");
991 lba |= ((u64)scsicmd[2]) << 24;
992 lba |= ((u64)scsicmd[3]) << 16;
993 lba |= ((u64)scsicmd[4]) << 8;
994 lba |= ((u64)scsicmd[5]);
996 len |= ((u32)scsicmd[7]) << 8;
997 len |= ((u32)scsicmd[8]);
1004 * scsi_16_lba_len - Get LBA and transfer length
1005 * @scsicmd: SCSI command to translate
1007 * Calculate LBA and transfer length for 16-byte commands.
1011 * @plen: the transfer length
1014 static void scsi_16_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
1019 VPRINTK("sixteen-byte command\n");
1021 lba |= ((u64)scsicmd[2]) << 56;
1022 lba |= ((u64)scsicmd[3]) << 48;
1023 lba |= ((u64)scsicmd[4]) << 40;
1024 lba |= ((u64)scsicmd[5]) << 32;
1025 lba |= ((u64)scsicmd[6]) << 24;
1026 lba |= ((u64)scsicmd[7]) << 16;
1027 lba |= ((u64)scsicmd[8]) << 8;
1028 lba |= ((u64)scsicmd[9]);
1030 len |= ((u32)scsicmd[10]) << 24;
1031 len |= ((u32)scsicmd[11]) << 16;
1032 len |= ((u32)scsicmd[12]) << 8;
1033 len |= ((u32)scsicmd[13]);
1040 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1041 * @qc: Storage for translated ATA taskfile
1042 * @scsicmd: SCSI command to translate
1044 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1047 * spin_lock_irqsave(host_set lock)
1050 * Zero on success, non-zero on error.
1053 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
1055 struct ata_taskfile *tf = &qc->tf;
1056 struct ata_device *dev = qc->dev;
1057 u64 dev_sectors = qc->dev->n_sectors;
1061 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1062 tf->protocol = ATA_PROT_NODATA;
1064 if (scsicmd[0] == VERIFY)
1065 scsi_10_lba_len(scsicmd, &block, &n_block);
1066 else if (scsicmd[0] == VERIFY_16)
1067 scsi_16_lba_len(scsicmd, &block, &n_block);
1073 if (block >= dev_sectors)
1075 if ((block + n_block) > dev_sectors)
1078 if (dev->flags & ATA_DFLAG_LBA) {
1079 tf->flags |= ATA_TFLAG_LBA;
1081 if (lba_28_ok(block, n_block)) {
1083 tf->command = ATA_CMD_VERIFY;
1084 tf->device |= (block >> 24) & 0xf;
1085 } else if (lba_48_ok(block, n_block)) {
1086 if (!(dev->flags & ATA_DFLAG_LBA48))
1090 tf->flags |= ATA_TFLAG_LBA48;
1091 tf->command = ATA_CMD_VERIFY_EXT;
1093 tf->hob_nsect = (n_block >> 8) & 0xff;
1095 tf->hob_lbah = (block >> 40) & 0xff;
1096 tf->hob_lbam = (block >> 32) & 0xff;
1097 tf->hob_lbal = (block >> 24) & 0xff;
1099 /* request too large even for LBA48 */
1102 tf->nsect = n_block & 0xff;
1104 tf->lbah = (block >> 16) & 0xff;
1105 tf->lbam = (block >> 8) & 0xff;
1106 tf->lbal = block & 0xff;
1108 tf->device |= ATA_LBA;
1111 u32 sect, head, cyl, track;
1113 if (!lba_28_ok(block, n_block))
1116 /* Convert LBA to CHS */
1117 track = (u32)block / dev->sectors;
1118 cyl = track / dev->heads;
1119 head = track % dev->heads;
1120 sect = (u32)block % dev->sectors + 1;
1122 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1123 (u32)block, track, cyl, head, sect);
1125 /* Check whether the converted CHS can fit.
1129 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1132 tf->command = ATA_CMD_VERIFY;
1133 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1136 tf->lbah = cyl >> 8;
1143 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
1144 /* "Invalid field in cbd" */
1148 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
1149 /* "Logical Block Address out of range" */
1153 qc->scsicmd->result = SAM_STAT_GOOD;
1158 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1159 * @qc: Storage for translated ATA taskfile
1160 * @scsicmd: SCSI command to translate
1162 * Converts any of six SCSI read/write commands into the
1163 * ATA counterpart, including starting sector (LBA),
1164 * sector count, and taking into account the device's LBA48
1167 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1168 * %WRITE_16 are currently supported.
1171 * spin_lock_irqsave(host_set lock)
1174 * Zero on success, non-zero on error.
1177 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
1179 struct ata_taskfile *tf = &qc->tf;
1180 struct ata_device *dev = qc->dev;
1184 qc->flags |= ATA_QCFLAG_IO;
1185 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1187 if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||
1188 scsicmd[0] == WRITE_16)
1189 tf->flags |= ATA_TFLAG_WRITE;
1191 /* Calculate the SCSI LBA, transfer length and FUA. */
1192 switch (scsicmd[0]) {
1195 scsi_10_lba_len(scsicmd, &block, &n_block);
1196 if (unlikely(scsicmd[1] & (1 << 3)))
1197 tf->flags |= ATA_TFLAG_FUA;
1201 scsi_6_lba_len(scsicmd, &block, &n_block);
1203 /* for 6-byte r/w commands, transfer length 0
1204 * means 256 blocks of data, not 0 block.
1211 scsi_16_lba_len(scsicmd, &block, &n_block);
1212 if (unlikely(scsicmd[1] & (1 << 3)))
1213 tf->flags |= ATA_TFLAG_FUA;
1216 DPRINTK("no-byte command\n");
1220 /* Check and compose ATA command */
1222 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1223 * length 0 means transfer 0 block of data.
1224 * However, for ATA R/W commands, sector count 0 means
1225 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1227 * WARNING: one or two older ATA drives treat 0 as 0...
1231 if (dev->flags & ATA_DFLAG_LBA) {
1232 tf->flags |= ATA_TFLAG_LBA;
1234 if (lba_28_ok(block, n_block)) {
1236 tf->device |= (block >> 24) & 0xf;
1237 } else if (lba_48_ok(block, n_block)) {
1238 if (!(dev->flags & ATA_DFLAG_LBA48))
1242 tf->flags |= ATA_TFLAG_LBA48;
1244 tf->hob_nsect = (n_block >> 8) & 0xff;
1246 tf->hob_lbah = (block >> 40) & 0xff;
1247 tf->hob_lbam = (block >> 32) & 0xff;
1248 tf->hob_lbal = (block >> 24) & 0xff;
1250 /* request too large even for LBA48 */
1253 if (unlikely(ata_rwcmd_protocol(qc) < 0))
1256 qc->nsect = n_block;
1257 tf->nsect = n_block & 0xff;
1259 tf->lbah = (block >> 16) & 0xff;
1260 tf->lbam = (block >> 8) & 0xff;
1261 tf->lbal = block & 0xff;
1263 tf->device |= ATA_LBA;
1266 u32 sect, head, cyl, track;
1268 /* The request -may- be too large for CHS addressing. */
1269 if (!lba_28_ok(block, n_block))
1272 if (unlikely(ata_rwcmd_protocol(qc) < 0))
1275 /* Convert LBA to CHS */
1276 track = (u32)block / dev->sectors;
1277 cyl = track / dev->heads;
1278 head = track % dev->heads;
1279 sect = (u32)block % dev->sectors + 1;
1281 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1282 (u32)block, track, cyl, head, sect);
1284 /* Check whether the converted CHS can fit.
1288 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1291 qc->nsect = n_block;
1292 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1295 tf->lbah = cyl >> 8;
1302 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
1303 /* "Invalid field in cbd" */
1307 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
1308 /* "Logical Block Address out of range" */
1312 qc->scsicmd->result = SAM_STAT_GOOD;
1316 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1318 struct scsi_cmnd *cmd = qc->scsicmd;
1319 u8 *cdb = cmd->cmnd;
1320 int need_sense = (qc->err_mask != 0);
1322 /* For ATA pass thru (SAT) commands, generate a sense block if
1323 * user mandated it or if there's an error. Note that if we
1324 * generate because the user forced us to, a check condition
1325 * is generated and the ATA register values are returned
1326 * whether the command completed successfully or not. If there
1327 * was no error, SK, ASC and ASCQ will all be zero.
1329 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1330 ((cdb[2] & 0x20) || need_sense)) {
1331 qc->ap->ops->tf_read(qc->ap, &qc->tf);
1332 ata_gen_ata_desc_sense(qc);
1335 cmd->result = SAM_STAT_GOOD;
1337 qc->ap->ops->tf_read(qc->ap, &qc->tf);
1339 /* TODO: decide which descriptor format to use
1340 * for 48b LBA devices and call that here
1341 * instead of the fixed desc, which is only
1342 * good for smaller LBA (and maybe CHS?)
1345 ata_gen_fixed_sense(qc);
1350 /* The ata_gen_..._sense routines fill in tf */
1351 ata_dump_status(qc->ap->id, &qc->tf);
1360 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1361 * @ap: ATA port to which the command is addressed
1362 * @dev: ATA device to which the command is addressed
1363 * @cmd: SCSI command to execute
1364 * @done: SCSI command completion function
1365 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1367 * Our ->queuecommand() function has decided that the SCSI
1368 * command issued can be directly translated into an ATA
1369 * command, rather than handled internally.
1371 * This function sets up an ata_queued_cmd structure for the
1372 * SCSI command, and sends that ata_queued_cmd to the hardware.
1374 * The xlat_func argument (actor) returns 0 if ready to execute
1375 * ATA command, else 1 to finish translation. If 1 is returned
1376 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1377 * to be set reflecting an error condition or clean (early)
1381 * spin_lock_irqsave(host_set lock)
1384 static void ata_scsi_translate(struct ata_port *ap, struct ata_device *dev,
1385 struct scsi_cmnd *cmd,
1386 void (*done)(struct scsi_cmnd *),
1387 ata_xlat_func_t xlat_func)
1389 struct ata_queued_cmd *qc;
1390 u8 *scsicmd = cmd->cmnd;
1394 qc = ata_scsi_qc_new(ap, dev, cmd, done);
1398 /* data is present; dma-map it */
1399 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1400 cmd->sc_data_direction == DMA_TO_DEVICE) {
1401 if (unlikely(cmd->request_bufflen < 1)) {
1402 printk(KERN_WARNING "ata%u(%u): WARNING: zero len r/w req\n",
1403 ap->id, dev->devno);
1408 ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
1410 ata_sg_init_one(qc, cmd->request_buffer,
1411 cmd->request_bufflen);
1413 qc->dma_dir = cmd->sc_data_direction;
1416 qc->complete_fn = ata_scsi_qc_complete;
1418 if (xlat_func(qc, scsicmd))
1421 /* select device, send command to hardware */
1430 DPRINTK("EXIT - early finish (good or error)\n");
1436 cmd->result = (DID_ERROR << 16);
1438 DPRINTK("EXIT - internal\n");
1443 * ata_scsi_rbuf_get - Map response buffer.
1444 * @cmd: SCSI command containing buffer to be mapped.
1445 * @buf_out: Pointer to mapped area.
1447 * Maps buffer contained within SCSI command @cmd.
1450 * spin_lock_irqsave(host_set lock)
1453 * Length of response buffer.
1456 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
1459 unsigned int buflen;
1462 struct scatterlist *sg;
1464 sg = (struct scatterlist *) cmd->request_buffer;
1465 buf = kmap_atomic(sg->page, KM_USER0) + sg->offset;
1466 buflen = sg->length;
1468 buf = cmd->request_buffer;
1469 buflen = cmd->request_bufflen;
1477 * ata_scsi_rbuf_put - Unmap response buffer.
1478 * @cmd: SCSI command containing buffer to be unmapped.
1479 * @buf: buffer to unmap
1481 * Unmaps response buffer contained within @cmd.
1484 * spin_lock_irqsave(host_set lock)
1487 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
1490 struct scatterlist *sg;
1492 sg = (struct scatterlist *) cmd->request_buffer;
1493 kunmap_atomic(buf - sg->offset, KM_USER0);
1498 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1499 * @args: device IDENTIFY data / SCSI command of interest.
1500 * @actor: Callback hook for desired SCSI command simulator
1502 * Takes care of the hard work of simulating a SCSI command...
1503 * Mapping the response buffer, calling the command's handler,
1504 * and handling the handler's return value. This return value
1505 * indicates whether the handler wishes the SCSI command to be
1506 * completed successfully (0), or not (in which case cmd->result
1507 * and sense buffer are assumed to be set).
1510 * spin_lock_irqsave(host_set lock)
1513 void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1514 unsigned int (*actor) (struct ata_scsi_args *args,
1515 u8 *rbuf, unsigned int buflen))
1518 unsigned int buflen, rc;
1519 struct scsi_cmnd *cmd = args->cmd;
1521 buflen = ata_scsi_rbuf_get(cmd, &rbuf);
1522 memset(rbuf, 0, buflen);
1523 rc = actor(args, rbuf, buflen);
1524 ata_scsi_rbuf_put(cmd, rbuf);
1527 cmd->result = SAM_STAT_GOOD;
1532 * ata_scsiop_inq_std - Simulate INQUIRY command
1533 * @args: device IDENTIFY data / SCSI command of interest.
1534 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1535 * @buflen: Response buffer length.
1537 * Returns standard device identification data associated
1538 * with non-VPD INQUIRY command output.
1541 * spin_lock_irqsave(host_set lock)
1544 unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
1545 unsigned int buflen)
1550 0x5, /* claim SPC-3 version compatibility */
1555 /* set scsi removeable (RMB) bit per ata bit */
1556 if (ata_id_removeable(args->id))
1561 memcpy(rbuf, hdr, sizeof(hdr));
1564 memcpy(&rbuf[8], "ATA ", 8);
1565 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD_OFS, 16);
1566 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV_OFS, 4);
1567 if (rbuf[32] == 0 || rbuf[32] == ' ')
1568 memcpy(&rbuf[32], "n/a ", 4);
1572 const u8 versions[] = {
1573 0x60, /* SAM-3 (no version claimed) */
1576 0x20, /* SBC-2 (no version claimed) */
1579 0x60 /* SPC-3 (no version claimed) */
1582 memcpy(rbuf + 59, versions, sizeof(versions));
1589 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1590 * @args: device IDENTIFY data / SCSI command of interest.
1591 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1592 * @buflen: Response buffer length.
1594 * Returns list of inquiry VPD pages available.
1597 * spin_lock_irqsave(host_set lock)
1600 unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
1601 unsigned int buflen)
1603 const u8 pages[] = {
1604 0x00, /* page 0x00, this page */
1605 0x80, /* page 0x80, unit serial no page */
1606 0x83 /* page 0x83, device ident page */
1608 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1611 memcpy(rbuf + 4, pages, sizeof(pages));
1617 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1618 * @args: device IDENTIFY data / SCSI command of interest.
1619 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1620 * @buflen: Response buffer length.
1622 * Returns ATA device serial number.
1625 * spin_lock_irqsave(host_set lock)
1628 unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
1629 unsigned int buflen)
1633 0x80, /* this page code */
1635 ATA_SERNO_LEN, /* page len */
1637 memcpy(rbuf, hdr, sizeof(hdr));
1639 if (buflen > (ATA_SERNO_LEN + 4 - 1))
1640 ata_id_string(args->id, (unsigned char *) &rbuf[4],
1641 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1647 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1648 * @args: device IDENTIFY data / SCSI command of interest.
1649 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1650 * @buflen: Response buffer length.
1652 * Yields two logical unit device identification designators:
1653 * - vendor specific ASCII containing the ATA serial number
1654 * - SAT defined "t10 vendor id based" containing ASCII vendor
1655 * name ("ATA "), model and serial numbers.
1658 * spin_lock_irqsave(host_set lock)
1661 unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
1662 unsigned int buflen)
1665 const int sat_model_serial_desc_len = 68;
1666 const int ata_model_byte_len = 40;
1668 rbuf[1] = 0x83; /* this page code */
1671 if (buflen > (ATA_SERNO_LEN + num + 3)) {
1672 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
1674 rbuf[num + 3] = ATA_SERNO_LEN;
1676 ata_id_string(args->id, (unsigned char *) rbuf + num,
1677 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1678 num += ATA_SERNO_LEN;
1680 if (buflen > (sat_model_serial_desc_len + num + 3)) {
1681 /* SAT defined lu model and serial numbers descriptor */
1682 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
1685 rbuf[num + 3] = sat_model_serial_desc_len;
1687 memcpy(rbuf + num, "ATA ", 8);
1689 ata_id_string(args->id, (unsigned char *) rbuf + num,
1690 ATA_ID_PROD_OFS, ata_model_byte_len);
1691 num += ata_model_byte_len;
1692 ata_id_string(args->id, (unsigned char *) rbuf + num,
1693 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1694 num += ATA_SERNO_LEN;
1696 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1701 * ata_scsiop_noop - Command handler that simply returns success.
1702 * @args: device IDENTIFY data / SCSI command of interest.
1703 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1704 * @buflen: Response buffer length.
1706 * No operation. Simply returns success to caller, to indicate
1707 * that the caller should successfully complete this SCSI command.
1710 * spin_lock_irqsave(host_set lock)
1713 unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
1714 unsigned int buflen)
1721 * ata_msense_push - Push data onto MODE SENSE data output buffer
1722 * @ptr_io: (input/output) Location to store more output data
1723 * @last: End of output data buffer
1724 * @buf: Pointer to BLOB being added to output buffer
1725 * @buflen: Length of BLOB
1727 * Store MODE SENSE data on an output buffer.
1733 static void ata_msense_push(u8 **ptr_io, const u8 *last,
1734 const u8 *buf, unsigned int buflen)
1738 if ((ptr + buflen - 1) > last)
1741 memcpy(ptr, buf, buflen);
1749 * ata_msense_caching - Simulate MODE SENSE caching info page
1750 * @id: device IDENTIFY data
1751 * @ptr_io: (input/output) Location to store more output data
1752 * @last: End of output data buffer
1754 * Generate a caching info page, which conditionally indicates
1755 * write caching to the SCSI layer, depending on device
1762 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
1765 u8 page[CACHE_MPAGE_LEN];
1767 memcpy(page, def_cache_mpage, sizeof(page));
1768 if (ata_id_wcache_enabled(id))
1769 page[2] |= (1 << 2); /* write cache enable */
1770 if (!ata_id_rahead_enabled(id))
1771 page[12] |= (1 << 5); /* disable read ahead */
1773 ata_msense_push(ptr_io, last, page, sizeof(page));
1774 return sizeof(page);
1778 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
1779 * @dev: Device associated with this MODE SENSE command
1780 * @ptr_io: (input/output) Location to store more output data
1781 * @last: End of output data buffer
1783 * Generate a generic MODE SENSE control mode page.
1789 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
1791 ata_msense_push(ptr_io, last, def_control_mpage,
1792 sizeof(def_control_mpage));
1793 return sizeof(def_control_mpage);
1797 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
1798 * @dev: Device associated with this MODE SENSE command
1799 * @ptr_io: (input/output) Location to store more output data
1800 * @last: End of output data buffer
1802 * Generate a generic MODE SENSE r/w error recovery page.
1808 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
1811 ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
1812 sizeof(def_rw_recovery_mpage));
1813 return sizeof(def_rw_recovery_mpage);
1817 * We can turn this into a real blacklist if it's needed, for now just
1818 * blacklist any Maxtor BANC1G10 revision firmware
1820 static int ata_dev_supports_fua(u16 *id)
1822 unsigned char model[41], fw[9];
1826 if (!ata_id_has_fua(id))
1829 ata_id_c_string(id, model, ATA_ID_PROD_OFS, sizeof(model));
1830 ata_id_c_string(id, fw, ATA_ID_FW_REV_OFS, sizeof(fw));
1832 if (strcmp(model, "Maxtor"))
1834 if (strcmp(fw, "BANC1G10"))
1837 return 0; /* blacklisted */
1841 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
1842 * @args: device IDENTIFY data / SCSI command of interest.
1843 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1844 * @buflen: Response buffer length.
1846 * Simulate MODE SENSE commands. Assume this is invoked for direct
1847 * access devices (e.g. disks) only. There should be no block
1848 * descriptor for other device types.
1851 * spin_lock_irqsave(host_set lock)
1854 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
1855 unsigned int buflen)
1857 struct ata_device *dev = args->dev;
1858 u8 *scsicmd = args->cmd->cmnd, *p, *last;
1859 const u8 sat_blk_desc[] = {
1860 0, 0, 0, 0, /* number of blocks: sat unspecified */
1862 0, 0x2, 0x0 /* block length: 512 bytes */
1865 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
1870 six_byte = (scsicmd[0] == MODE_SENSE);
1871 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
1873 * LLBA bit in msense(10) ignored (compliant)
1876 page_control = scsicmd[2] >> 6;
1877 switch (page_control) {
1878 case 0: /* current */
1879 break; /* supported */
1881 goto saving_not_supp;
1882 case 1: /* changeable */
1883 case 2: /* defaults */
1889 output_len = 4 + (ebd ? 8 : 0);
1890 alloc_len = scsicmd[4];
1892 output_len = 8 + (ebd ? 8 : 0);
1893 alloc_len = (scsicmd[7] << 8) + scsicmd[8];
1895 minlen = (alloc_len < buflen) ? alloc_len : buflen;
1897 p = rbuf + output_len;
1898 last = rbuf + minlen - 1;
1900 pg = scsicmd[2] & 0x3f;
1903 * No mode subpages supported (yet) but asking for _all_
1904 * subpages may be valid
1906 if (spg && (spg != ALL_SUB_MPAGES))
1910 case RW_RECOVERY_MPAGE:
1911 output_len += ata_msense_rw_recovery(&p, last);
1915 output_len += ata_msense_caching(args->id, &p, last);
1918 case CONTROL_MPAGE: {
1919 output_len += ata_msense_ctl_mode(&p, last);
1924 output_len += ata_msense_rw_recovery(&p, last);
1925 output_len += ata_msense_caching(args->id, &p, last);
1926 output_len += ata_msense_ctl_mode(&p, last);
1929 default: /* invalid page code */
1937 if (ata_dev_supports_fua(args->id) && dev->flags & ATA_DFLAG_LBA48 &&
1938 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
1943 rbuf[0] = output_len;
1948 rbuf[3] = sizeof(sat_blk_desc);
1950 memcpy(rbuf + 4, sat_blk_desc,
1951 sizeof(sat_blk_desc));
1955 rbuf[0] = output_len >> 8;
1957 rbuf[1] = output_len;
1962 rbuf[7] = sizeof(sat_blk_desc);
1964 memcpy(rbuf + 8, sat_blk_desc,
1965 sizeof(sat_blk_desc));
1971 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
1972 /* "Invalid field in cbd" */
1976 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
1977 /* "Saving parameters not supported" */
1982 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
1983 * @args: device IDENTIFY data / SCSI command of interest.
1984 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1985 * @buflen: Response buffer length.
1987 * Simulate READ CAPACITY commands.
1990 * spin_lock_irqsave(host_set lock)
1993 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
1994 unsigned int buflen)
2001 if (ata_id_has_lba(args->id)) {
2002 if (ata_id_has_lba48(args->id))
2003 n_sectors = ata_id_u64(args->id, 100);
2005 n_sectors = ata_id_u32(args->id, 60);
2007 /* CHS default translation */
2008 n_sectors = args->id[1] * args->id[3] * args->id[6];
2010 if (ata_id_current_chs_valid(args->id))
2011 /* CHS current translation */
2012 n_sectors = ata_id_u32(args->id, 57);
2015 n_sectors--; /* ATA TotalUserSectors - 1 */
2017 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2018 if( n_sectors >= 0xffffffffULL )
2019 tmp = 0xffffffff ; /* Return max count on overflow */
2023 /* sector count, 32-bit */
2024 rbuf[0] = tmp >> (8 * 3);
2025 rbuf[1] = tmp >> (8 * 2);
2026 rbuf[2] = tmp >> (8 * 1);
2030 tmp = ATA_SECT_SIZE;
2035 /* sector count, 64-bit */
2036 tmp = n_sectors >> (8 * 4);
2037 rbuf[2] = tmp >> (8 * 3);
2038 rbuf[3] = tmp >> (8 * 2);
2039 rbuf[4] = tmp >> (8 * 1);
2042 rbuf[6] = tmp >> (8 * 3);
2043 rbuf[7] = tmp >> (8 * 2);
2044 rbuf[8] = tmp >> (8 * 1);
2048 tmp = ATA_SECT_SIZE;
2049 rbuf[12] = tmp >> 8;
2057 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2058 * @args: device IDENTIFY data / SCSI command of interest.
2059 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2060 * @buflen: Response buffer length.
2062 * Simulate REPORT LUNS command.
2065 * spin_lock_irqsave(host_set lock)
2068 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
2069 unsigned int buflen)
2072 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2078 * ata_scsi_set_sense - Set SCSI sense data and status
2079 * @cmd: SCSI request to be handled
2080 * @sk: SCSI-defined sense key
2081 * @asc: SCSI-defined additional sense code
2082 * @ascq: SCSI-defined additional sense code qualifier
2084 * Helper function that builds a valid fixed format, current
2085 * response code and the given sense key (sk), additional sense
2086 * code (asc) and additional sense code qualifier (ascq) with
2087 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and
2088 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
2094 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
2096 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
2098 cmd->sense_buffer[0] = 0x70; /* fixed format, current */
2099 cmd->sense_buffer[2] = sk;
2100 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */
2101 cmd->sense_buffer[12] = asc;
2102 cmd->sense_buffer[13] = ascq;
2106 * ata_scsi_badcmd - End a SCSI request with an error
2107 * @cmd: SCSI request to be handled
2108 * @done: SCSI command completion function
2109 * @asc: SCSI-defined additional sense code
2110 * @ascq: SCSI-defined additional sense code qualifier
2112 * Helper function that completes a SCSI command with
2113 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
2114 * and the specified additional sense codes.
2117 * spin_lock_irqsave(host_set lock)
2120 void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
2123 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
2128 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2130 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2131 /* FIXME: not quite right; we don't want the
2132 * translation of taskfile registers into
2133 * a sense descriptors, since that's only
2134 * correct for ATA, not ATAPI
2136 qc->ap->ops->tf_read(qc->ap, &qc->tf);
2137 ata_gen_ata_desc_sense(qc);
2140 qc->scsidone(qc->scsicmd);
2144 /* is it pointless to prefer PIO for "safety reasons"? */
2145 static inline int ata_pio_use_silly(struct ata_port *ap)
2147 return (ap->flags & ATA_FLAG_PIO_DMA);
2150 static void atapi_request_sense(struct ata_queued_cmd *qc)
2152 struct ata_port *ap = qc->ap;
2153 struct scsi_cmnd *cmd = qc->scsicmd;
2155 DPRINTK("ATAPI request sense\n");
2157 /* FIXME: is this needed? */
2158 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
2160 ap->ops->tf_read(ap, &qc->tf);
2162 /* fill these in, for the case where they are -not- overwritten */
2163 cmd->sense_buffer[0] = 0x70;
2164 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2168 ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
2169 qc->dma_dir = DMA_FROM_DEVICE;
2171 memset(&qc->cdb, 0, qc->dev->cdb_len);
2172 qc->cdb[0] = REQUEST_SENSE;
2173 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2175 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2176 qc->tf.command = ATA_CMD_PACKET;
2178 if (ata_pio_use_silly(ap)) {
2179 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2180 qc->tf.feature |= ATAPI_PKT_DMA;
2182 qc->tf.protocol = ATA_PROT_ATAPI;
2183 qc->tf.lbam = (8 * 1024) & 0xff;
2184 qc->tf.lbah = (8 * 1024) >> 8;
2186 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2188 qc->complete_fn = atapi_sense_complete;
2195 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2197 struct scsi_cmnd *cmd = qc->scsicmd;
2198 unsigned int err_mask = qc->err_mask;
2200 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2202 if (unlikely(err_mask & AC_ERR_DEV)) {
2203 cmd->result = SAM_STAT_CHECK_CONDITION;
2204 atapi_request_sense(qc);
2206 } else if (unlikely(err_mask)) {
2207 /* FIXME: not quite right; we don't want the
2208 * translation of taskfile registers into
2209 * a sense descriptors, since that's only
2210 * correct for ATA, not ATAPI
2212 qc->ap->ops->tf_read(qc->ap, &qc->tf);
2213 ata_gen_ata_desc_sense(qc);
2215 u8 *scsicmd = cmd->cmnd;
2217 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2219 unsigned int buflen;
2221 buflen = ata_scsi_rbuf_get(cmd, &buf);
2223 /* ATAPI devices typically report zero for their SCSI version,
2224 * and sometimes deviate from the spec WRT response data
2225 * format. If SCSI version is reported as zero like normal,
2226 * then we make the following fixups: 1) Fake MMC-5 version,
2227 * to indicate to the Linux scsi midlayer this is a modern
2228 * device. 2) Ensure response data format / ATAPI information
2229 * are always correct.
2236 ata_scsi_rbuf_put(cmd, buf);
2239 cmd->result = SAM_STAT_GOOD;
2246 * atapi_xlat - Initialize PACKET taskfile
2247 * @qc: command structure to be initialized
2248 * @scsicmd: SCSI CDB associated with this PACKET command
2251 * spin_lock_irqsave(host_set lock)
2254 * Zero on success, non-zero on failure.
2257 static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
2259 struct scsi_cmnd *cmd = qc->scsicmd;
2260 struct ata_device *dev = qc->dev;
2261 int using_pio = (dev->flags & ATA_DFLAG_PIO);
2262 int nodata = (cmd->sc_data_direction == DMA_NONE);
2265 /* Check whether ATAPI DMA is safe */
2266 if (ata_check_atapi_dma(qc))
2269 memcpy(&qc->cdb, scsicmd, dev->cdb_len);
2271 qc->complete_fn = atapi_qc_complete;
2273 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2274 if (cmd->sc_data_direction == DMA_TO_DEVICE) {
2275 qc->tf.flags |= ATA_TFLAG_WRITE;
2276 DPRINTK("direction: write\n");
2279 qc->tf.command = ATA_CMD_PACKET;
2281 /* no data, or PIO data xfer */
2282 if (using_pio || nodata) {
2284 qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
2286 qc->tf.protocol = ATA_PROT_ATAPI;
2287 qc->tf.lbam = (8 * 1024) & 0xff;
2288 qc->tf.lbah = (8 * 1024) >> 8;
2293 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
2294 qc->tf.feature |= ATAPI_PKT_DMA;
2296 #ifdef ATAPI_ENABLE_DMADIR
2297 /* some SATA bridges need us to indicate data xfer direction */
2298 if (cmd->sc_data_direction != DMA_TO_DEVICE)
2299 qc->tf.feature |= ATAPI_DMADIR;
2303 qc->nbytes = cmd->bufflen;
2309 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2310 * @ap: ATA port to which the device is attached
2311 * @scsidev: SCSI device from which we derive the ATA device
2313 * Given various information provided in struct scsi_cmnd,
2314 * map that onto an ATA bus, and using that mapping
2315 * determine which ata_device is associated with the
2316 * SCSI command to be sent.
2319 * spin_lock_irqsave(host_set lock)
2322 * Associated ATA device, or %NULL if not found.
2325 static struct ata_device *
2326 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2328 struct ata_device *dev;
2330 /* skip commands not addressed to targets we simulate */
2331 if (likely(scsidev->id < ATA_MAX_DEVICES))
2332 dev = &ap->device[scsidev->id];
2336 if (unlikely((scsidev->channel != 0) ||
2337 (scsidev->lun != 0)))
2340 if (unlikely(!ata_dev_enabled(dev)))
2343 if (!atapi_enabled || (ap->flags & ATA_FLAG_NO_ATAPI)) {
2344 if (unlikely(dev->class == ATA_DEV_ATAPI)) {
2345 printk(KERN_WARNING "ata%u(%u): WARNING: ATAPI is %s, device ignored.\n",
2346 ap->id, dev->devno, atapi_enabled ? "not supported with this driver" : "disabled");
2355 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2356 * @byte1: Byte 1 from pass-thru CDB.
2359 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2362 ata_scsi_map_proto(u8 byte1)
2364 switch((byte1 & 0x1e) >> 1) {
2365 case 3: /* Non-data */
2366 return ATA_PROT_NODATA;
2369 return ATA_PROT_DMA;
2371 case 4: /* PIO Data-in */
2372 case 5: /* PIO Data-out */
2373 return ATA_PROT_PIO;
2375 case 10: /* Device Reset */
2376 case 0: /* Hard Reset */
2378 case 2: /* Bus Idle */
2379 case 7: /* Packet */
2380 case 8: /* DMA Queued */
2381 case 9: /* Device Diagnostic */
2382 case 11: /* UDMA Data-in */
2383 case 12: /* UDMA Data-Out */
2384 case 13: /* FPDMA */
2385 default: /* Reserved */
2389 return ATA_PROT_UNKNOWN;
2393 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2394 * @qc: command structure to be initialized
2395 * @scsicmd: SCSI command to convert
2397 * Handles either 12 or 16-byte versions of the CDB.
2400 * Zero on success, non-zero on failure.
2403 ata_scsi_pass_thru(struct ata_queued_cmd *qc, const u8 *scsicmd)
2405 struct ata_taskfile *tf = &(qc->tf);
2406 struct scsi_cmnd *cmd = qc->scsicmd;
2408 if ((tf->protocol = ata_scsi_map_proto(scsicmd[1])) == ATA_PROT_UNKNOWN)
2411 if (scsicmd[1] & 0xe0)
2412 /* PIO multi not supported yet */
2416 * 12 and 16 byte CDBs use different offsets to
2417 * provide the various register values.
2419 if (scsicmd[0] == ATA_16) {
2421 * 16-byte CDB - may contain extended commands.
2423 * If that is the case, copy the upper byte register values.
2425 if (scsicmd[1] & 0x01) {
2426 tf->hob_feature = scsicmd[3];
2427 tf->hob_nsect = scsicmd[5];
2428 tf->hob_lbal = scsicmd[7];
2429 tf->hob_lbam = scsicmd[9];
2430 tf->hob_lbah = scsicmd[11];
2431 tf->flags |= ATA_TFLAG_LBA48;
2433 tf->flags &= ~ATA_TFLAG_LBA48;
2436 * Always copy low byte, device and command registers.
2438 tf->feature = scsicmd[4];
2439 tf->nsect = scsicmd[6];
2440 tf->lbal = scsicmd[8];
2441 tf->lbam = scsicmd[10];
2442 tf->lbah = scsicmd[12];
2443 tf->device = scsicmd[13];
2444 tf->command = scsicmd[14];
2447 * 12-byte CDB - incapable of extended commands.
2449 tf->flags &= ~ATA_TFLAG_LBA48;
2451 tf->feature = scsicmd[3];
2452 tf->nsect = scsicmd[4];
2453 tf->lbal = scsicmd[5];
2454 tf->lbam = scsicmd[6];
2455 tf->lbah = scsicmd[7];
2456 tf->device = scsicmd[8];
2457 tf->command = scsicmd[9];
2460 * If slave is possible, enforce correct master/slave bit
2462 if (qc->ap->flags & ATA_FLAG_SLAVE_POSS)
2463 tf->device = qc->dev->devno ?
2464 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2467 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2468 * SET_FEATURES - XFER MODE must be preceded/succeeded
2469 * by an update to hardware-specific registers for each
2470 * controller (i.e. the reason for ->set_piomode(),
2471 * ->set_dmamode(), and ->post_set_mode() hooks).
2473 if ((tf->command == ATA_CMD_SET_FEATURES)
2474 && (tf->feature == SETFEATURES_XFER))
2478 * Set flags so that all registers will be written,
2479 * and pass on write indication (used for PIO/DMA
2482 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2484 if (cmd->sc_data_direction == DMA_TO_DEVICE)
2485 tf->flags |= ATA_TFLAG_WRITE;
2488 * Set transfer length.
2490 * TODO: find out if we need to do more here to
2491 * cover scatter/gather case.
2493 qc->nsect = cmd->bufflen / ATA_SECT_SIZE;
2498 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x00);
2499 /* "Invalid field in cdb" */
2504 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2506 * @cmd: SCSI command opcode to consider
2508 * Look up the SCSI command given, and determine whether the
2509 * SCSI command is to be translated or simulated.
2512 * Pointer to translation function if possible, %NULL if not.
2515 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2525 return ata_scsi_rw_xlat;
2527 case SYNCHRONIZE_CACHE:
2528 if (ata_try_flush_cache(dev))
2529 return ata_scsi_flush_xlat;
2534 return ata_scsi_verify_xlat;
2538 return ata_scsi_pass_thru;
2541 return ata_scsi_start_stop_xlat;
2548 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2549 * @ap: ATA port to which the command was being sent
2550 * @cmd: SCSI command to dump
2552 * Prints the contents of a SCSI command via printk().
2555 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2556 struct scsi_cmnd *cmd)
2559 struct scsi_device *scsidev = cmd->device;
2560 u8 *scsicmd = cmd->cmnd;
2562 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2564 scsidev->channel, scsidev->id, scsidev->lun,
2565 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2566 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2571 static inline void __ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
2572 struct ata_port *ap, struct ata_device *dev)
2574 if (dev->class == ATA_DEV_ATA) {
2575 ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
2579 ata_scsi_translate(ap, dev, cmd, done, xlat_func);
2581 ata_scsi_simulate(ap, dev, cmd, done);
2583 ata_scsi_translate(ap, dev, cmd, done, atapi_xlat);
2587 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
2588 * @cmd: SCSI command to be sent
2589 * @done: Completion function, called when command is complete
2591 * In some cases, this function translates SCSI commands into
2592 * ATA taskfiles, and queues the taskfiles to be sent to
2593 * hardware. In other cases, this function simulates a
2594 * SCSI device by evaluating and responding to certain
2595 * SCSI commands. This creates the overall effect of
2596 * ATA and ATAPI devices appearing as SCSI devices.
2599 * Releases scsi-layer-held lock, and obtains host_set lock.
2605 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
2607 struct ata_port *ap;
2608 struct ata_device *dev;
2609 struct scsi_device *scsidev = cmd->device;
2610 struct Scsi_Host *shost = scsidev->host;
2612 ap = (struct ata_port *) &shost->hostdata[0];
2614 spin_unlock(shost->host_lock);
2615 spin_lock(&ap->host_set->lock);
2617 ata_scsi_dump_cdb(ap, cmd);
2619 dev = ata_scsi_find_dev(ap, scsidev);
2621 __ata_scsi_queuecmd(cmd, done, ap, dev);
2623 cmd->result = (DID_BAD_TARGET << 16);
2627 spin_unlock(&ap->host_set->lock);
2628 spin_lock(shost->host_lock);
2633 * ata_scsi_simulate - simulate SCSI command on ATA device
2634 * @ap: port the device is connected to
2635 * @dev: the target device
2636 * @cmd: SCSI command being sent to device.
2637 * @done: SCSI command completion function.
2639 * Interprets and directly executes a select list of SCSI commands
2640 * that can be handled internally.
2643 * spin_lock_irqsave(host_set lock)
2646 void ata_scsi_simulate(struct ata_port *ap, struct ata_device *dev,
2647 struct scsi_cmnd *cmd,
2648 void (*done)(struct scsi_cmnd *))
2650 struct ata_scsi_args args;
2651 const u8 *scsicmd = cmd->cmnd;
2659 switch(scsicmd[0]) {
2660 /* no-op's, complete with success */
2661 case SYNCHRONIZE_CACHE:
2665 case TEST_UNIT_READY:
2666 case FORMAT_UNIT: /* FIXME: correct? */
2667 case SEND_DIAGNOSTIC: /* FIXME: correct? */
2668 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
2672 if (scsicmd[1] & 2) /* is CmdDt set? */
2673 ata_scsi_invalid_field(cmd, done);
2674 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
2675 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
2676 else if (scsicmd[2] == 0x00)
2677 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
2678 else if (scsicmd[2] == 0x80)
2679 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
2680 else if (scsicmd[2] == 0x83)
2681 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
2683 ata_scsi_invalid_field(cmd, done);
2688 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
2691 case MODE_SELECT: /* unconditionally return */
2692 case MODE_SELECT_10: /* bad-field-in-cdb */
2693 ata_scsi_invalid_field(cmd, done);
2697 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2700 case SERVICE_ACTION_IN:
2701 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
2702 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
2704 ata_scsi_invalid_field(cmd, done);
2708 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
2711 /* mandatory commands we haven't implemented yet */
2714 /* all other commands */
2716 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
2717 /* "Invalid command operation code" */
2723 void ata_scsi_scan_host(struct ata_port *ap)
2725 struct ata_device *dev;
2728 if (ap->flags & ATA_FLAG_DISABLED)
2731 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2732 dev = &ap->device[i];
2734 if (ata_dev_enabled(dev))
2735 scsi_scan_target(&ap->host->shost_gendev, 0, i, 0, 0);