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>
41 #include <scsi/scsi_host.h>
42 #include <linux/libata.h>
43 #include <asm/uaccess.h>
47 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
48 static struct ata_device *
49 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev);
52 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
53 void (*done)(struct scsi_cmnd *))
55 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
56 /* "Invalid field in cbd" */
61 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
62 * @sdev: SCSI device for which BIOS geometry is to be determined
63 * @bdev: block device associated with @sdev
64 * @capacity: capacity of SCSI device
65 * @geom: location to which geometry will be output
67 * Generic bios head/sector/cylinder calculator
68 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
69 * mapping. Some situations may arise where the disk is not
70 * bootable if this is not used.
73 * Defined by the SCSI layer. We don't really care.
78 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
79 sector_t capacity, int geom[])
83 sector_div(capacity, 255*63);
89 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
92 struct ata_device *dev;
93 int val = -EINVAL, rc = -EINVAL;
95 ap = (struct ata_port *) &scsidev->host->hostdata[0];
99 dev = ata_scsi_find_dev(ap, scsidev);
106 case ATA_IOC_GET_IO32:
108 if (copy_to_user(arg, &val, 1))
112 case ATA_IOC_SET_IO32:
113 val = (unsigned long) arg;
128 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
129 * @ap: ATA port to which the new command is attached
130 * @dev: ATA device to which the new command is attached
131 * @cmd: SCSI command that originated this ATA command
132 * @done: SCSI command completion function
134 * Obtain a reference to an unused ata_queued_cmd structure,
135 * which is the basic libata structure representing a single
136 * ATA command sent to the hardware.
138 * If a command was available, fill in the SCSI-specific
139 * portions of the structure with information on the
143 * spin_lock_irqsave(host_set lock)
146 * Command allocated, or %NULL if none available.
148 struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap,
149 struct ata_device *dev,
150 struct scsi_cmnd *cmd,
151 void (*done)(struct scsi_cmnd *))
153 struct ata_queued_cmd *qc;
155 qc = ata_qc_new_init(ap, dev);
161 qc->__sg = (struct scatterlist *) cmd->request_buffer;
162 qc->n_elem = cmd->use_sg;
164 qc->__sg = &qc->sgent;
168 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
176 * ata_to_sense_error - convert ATA error to SCSI error
177 * @qc: Command that we are erroring out
178 * @drv_stat: value contained in ATA status register
180 * Converts an ATA error into a SCSI error. While we are at it
181 * we decode and dump the ATA error for the user so that they
182 * have some idea what really happened at the non make-believe
186 * spin_lock_irqsave(host_set lock)
189 void ata_to_sense_error(struct ata_queued_cmd *qc, u8 drv_stat)
191 struct scsi_cmnd *cmd = qc->scsicmd;
193 /* Based on the 3ware driver translation table */
194 static unsigned char sense_table[][4] = {
196 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
198 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
200 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
201 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
202 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
203 /* MC|ID|ABRT|TRK0|MARK */
204 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
206 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
207 /* Bad address mark */
208 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
210 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
212 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
213 /* Media change request */
214 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
216 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
218 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
220 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
221 /* BBD - block marked bad */
222 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
223 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
225 static unsigned char stat_table[][4] = {
226 /* Must be first because BUSY means no other bits valid */
227 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
228 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
229 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
230 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
231 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
236 * Is this an error we can process/parse
239 if(drv_stat & ATA_ERR)
240 /* Read the err bits */
241 err = ata_chk_err(qc->ap);
243 /* Display the ATA level error info */
245 printk(KERN_WARNING "ata%u: status=0x%02x { ", qc->ap->id, drv_stat);
249 err = 0; /* Data is not valid in this case */
252 if(drv_stat & 0x40) printk("DriveReady ");
253 if(drv_stat & 0x20) printk("DeviceFault ");
254 if(drv_stat & 0x10) printk("SeekComplete ");
255 if(drv_stat & 0x08) printk("DataRequest ");
256 if(drv_stat & 0x04) printk("CorrectedError ");
257 if(drv_stat & 0x02) printk("Index ");
258 if(drv_stat & 0x01) printk("Error ");
264 printk(KERN_WARNING "ata%u: error=0x%02x { ", qc->ap->id, err);
265 if(err & 0x04) printk("DriveStatusError ");
273 if(err & 0x40) printk("UncorrectableError ");
274 if(err & 0x10) printk("SectorIdNotFound ");
275 if(err & 0x02) printk("TrackZeroNotFound ");
276 if(err & 0x01) printk("AddrMarkNotFound ");
279 /* Should we dump sector info here too ?? */
284 while(sense_table[i][0] != 0xFF)
286 /* Look for best matches first */
287 if((sense_table[i][0] & err) == sense_table[i][0])
289 ata_scsi_set_sense(cmd, sense_table[i][1] /* sk */,
290 sense_table[i][2] /* asc */,
291 sense_table[i][3] /* ascq */ );
296 /* No immediate match */
298 printk(KERN_DEBUG "ata%u: no sense translation for 0x%02x\n", qc->ap->id, err);
301 /* Fall back to interpreting status bits */
302 while(stat_table[i][0] != 0xFF)
304 if(stat_table[i][0] & drv_stat)
306 ata_scsi_set_sense(cmd, sense_table[i][1] /* sk */,
307 sense_table[i][2] /* asc */,
308 sense_table[i][3] /* ascq */ );
314 printk(KERN_ERR "ata%u: called with no error (%02X)!\n", qc->ap->id, drv_stat);
315 /* additional-sense-code[-qualifier] */
317 if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
318 ata_scsi_set_sense(cmd, MEDIUM_ERROR, 0x11, 0x4);
319 /* "unrecovered read error" */
321 ata_scsi_set_sense(cmd, MEDIUM_ERROR, 0xc, 0x2);
322 /* "write error - auto-reallocation failed" */
327 * ata_scsi_slave_config - Set SCSI device attributes
328 * @sdev: SCSI device to examine
330 * This is called before we actually start reading
331 * and writing to the device, to configure certain
332 * SCSI mid-layer behaviors.
335 * Defined by SCSI layer. We don't really care.
338 int ata_scsi_slave_config(struct scsi_device *sdev)
340 sdev->use_10_for_rw = 1;
341 sdev->use_10_for_ms = 1;
343 blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD);
345 if (sdev->id < ATA_MAX_DEVICES) {
347 struct ata_device *dev;
349 ap = (struct ata_port *) &sdev->host->hostdata[0];
350 dev = &ap->device[sdev->id];
352 /* TODO: 1024 is an arbitrary number, not the
353 * hardware maximum. This should be increased to
354 * 65534 when Jens Axboe's patch for dynamically
355 * determining max_sectors is merged.
357 if ((dev->flags & ATA_DFLAG_LBA48) &&
358 ((dev->flags & ATA_DFLAG_LOCK_SECTORS) == 0)) {
360 * do not overwrite sdev->host->max_sectors, since
361 * other drives on this host may not support LBA48
363 blk_queue_max_sectors(sdev->request_queue, 2048);
367 * SATA DMA transfers must be multiples of 4 byte, so
368 * we need to pad ATAPI transfers using an extra sg.
369 * Decrement max hw segments accordingly.
371 if (dev->class == ATA_DEV_ATAPI) {
372 request_queue_t *q = sdev->request_queue;
373 blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
377 return 0; /* scsi layer doesn't check return value, sigh */
381 * ata_scsi_error - SCSI layer error handler callback
382 * @host: SCSI host on which error occurred
384 * Handles SCSI-layer-thrown error events.
387 * Inherited from SCSI layer (none, can sleep)
393 int ata_scsi_error(struct Scsi_Host *host)
399 ap = (struct ata_port *) &host->hostdata[0];
400 ap->ops->eng_timeout(ap);
402 /* TODO: this is per-command; when queueing is supported
403 * this code will either change or move to a more
407 INIT_LIST_HEAD(&host->eh_cmd_q);
414 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
415 * @qc: Storage for translated ATA taskfile
416 * @scsicmd: SCSI command to translate
418 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
419 * (to start). Perhaps these commands should be preceded by
420 * CHECK POWER MODE to see what power mode the device is already in.
421 * [See SAT revision 5 at www.t10.org]
424 * spin_lock_irqsave(host_set lock)
427 * Zero on success, non-zero on error.
430 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
433 struct ata_taskfile *tf = &qc->tf;
435 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
436 tf->protocol = ATA_PROT_NODATA;
437 if (scsicmd[1] & 0x1) {
438 ; /* ignore IMMED bit, violates sat-r05 */
440 if (scsicmd[4] & 0x2)
441 goto invalid_fld; /* LOEJ bit set not supported */
442 if (((scsicmd[4] >> 4) & 0xf) != 0)
443 goto invalid_fld; /* power conditions not supported */
444 if (scsicmd[4] & 0x1) {
445 tf->nsect = 1; /* 1 sector, lba=0 */
447 if (qc->dev->flags & ATA_DFLAG_LBA) {
448 qc->tf.flags |= ATA_TFLAG_LBA;
453 tf->device |= ATA_LBA;
456 tf->lbal = 0x1; /* sect */
457 tf->lbam = 0x0; /* cyl low */
458 tf->lbah = 0x0; /* cyl high */
461 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
463 tf->nsect = 0; /* time period value (0 implies now) */
464 tf->command = ATA_CMD_STANDBY;
465 /* Consider: ATA STANDBY IMMEDIATE command */
468 * Standby and Idle condition timers could be implemented but that
469 * would require libata to implement the Power condition mode page
470 * and allow the user to change it. Changing mode pages requires
471 * MODE SELECT to be implemented.
477 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
478 /* "Invalid field in cbd" */
484 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
485 * @qc: Storage for translated ATA taskfile
486 * @scsicmd: SCSI command to translate (ignored)
488 * Sets up an ATA taskfile to issue FLUSH CACHE or
492 * spin_lock_irqsave(host_set lock)
495 * Zero on success, non-zero on error.
498 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
500 struct ata_taskfile *tf = &qc->tf;
502 tf->flags |= ATA_TFLAG_DEVICE;
503 tf->protocol = ATA_PROT_NODATA;
505 if ((qc->dev->flags & ATA_DFLAG_LBA48) &&
506 (ata_id_has_flush_ext(qc->dev->id)))
507 tf->command = ATA_CMD_FLUSH_EXT;
509 tf->command = ATA_CMD_FLUSH;
515 * scsi_6_lba_len - Get LBA and transfer length
516 * @scsicmd: SCSI command to translate
518 * Calculate LBA and transfer length for 6-byte commands.
522 * @plen: the transfer length
525 static void scsi_6_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
530 VPRINTK("six-byte command\n");
532 lba |= ((u64)scsicmd[2]) << 8;
533 lba |= ((u64)scsicmd[3]);
535 len |= ((u32)scsicmd[4]);
542 * scsi_10_lba_len - Get LBA and transfer length
543 * @scsicmd: SCSI command to translate
545 * Calculate LBA and transfer length for 10-byte commands.
549 * @plen: the transfer length
552 static void scsi_10_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
557 VPRINTK("ten-byte command\n");
559 lba |= ((u64)scsicmd[2]) << 24;
560 lba |= ((u64)scsicmd[3]) << 16;
561 lba |= ((u64)scsicmd[4]) << 8;
562 lba |= ((u64)scsicmd[5]);
564 len |= ((u32)scsicmd[7]) << 8;
565 len |= ((u32)scsicmd[8]);
572 * scsi_16_lba_len - Get LBA and transfer length
573 * @scsicmd: SCSI command to translate
575 * Calculate LBA and transfer length for 16-byte commands.
579 * @plen: the transfer length
582 static void scsi_16_lba_len(const u8 *scsicmd, u64 *plba, u32 *plen)
587 VPRINTK("sixteen-byte command\n");
589 lba |= ((u64)scsicmd[2]) << 56;
590 lba |= ((u64)scsicmd[3]) << 48;
591 lba |= ((u64)scsicmd[4]) << 40;
592 lba |= ((u64)scsicmd[5]) << 32;
593 lba |= ((u64)scsicmd[6]) << 24;
594 lba |= ((u64)scsicmd[7]) << 16;
595 lba |= ((u64)scsicmd[8]) << 8;
596 lba |= ((u64)scsicmd[9]);
598 len |= ((u32)scsicmd[10]) << 24;
599 len |= ((u32)scsicmd[11]) << 16;
600 len |= ((u32)scsicmd[12]) << 8;
601 len |= ((u32)scsicmd[13]);
608 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
609 * @qc: Storage for translated ATA taskfile
610 * @scsicmd: SCSI command to translate
612 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
615 * spin_lock_irqsave(host_set lock)
618 * Zero on success, non-zero on error.
621 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
623 struct ata_taskfile *tf = &qc->tf;
624 struct ata_device *dev = qc->dev;
625 u64 dev_sectors = qc->dev->n_sectors;
629 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
630 tf->protocol = ATA_PROT_NODATA;
632 if (scsicmd[0] == VERIFY)
633 scsi_10_lba_len(scsicmd, &block, &n_block);
634 else if (scsicmd[0] == VERIFY_16)
635 scsi_16_lba_len(scsicmd, &block, &n_block);
641 if (block >= dev_sectors)
643 if ((block + n_block) > dev_sectors)
646 if (dev->flags & ATA_DFLAG_LBA) {
647 tf->flags |= ATA_TFLAG_LBA;
649 if (dev->flags & ATA_DFLAG_LBA48) {
650 if (n_block > (64 * 1024))
654 tf->flags |= ATA_TFLAG_LBA48;
655 tf->command = ATA_CMD_VERIFY_EXT;
657 tf->hob_nsect = (n_block >> 8) & 0xff;
659 tf->hob_lbah = (block >> 40) & 0xff;
660 tf->hob_lbam = (block >> 32) & 0xff;
661 tf->hob_lbal = (block >> 24) & 0xff;
667 tf->command = ATA_CMD_VERIFY;
669 tf->device |= (block >> 24) & 0xf;
672 tf->nsect = n_block & 0xff;
674 tf->lbah = (block >> 16) & 0xff;
675 tf->lbam = (block >> 8) & 0xff;
676 tf->lbal = block & 0xff;
678 tf->device |= ATA_LBA;
681 u32 sect, head, cyl, track;
686 /* Convert LBA to CHS */
687 track = (u32)block / dev->sectors;
688 cyl = track / dev->heads;
689 head = track % dev->heads;
690 sect = (u32)block % dev->sectors + 1;
692 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
693 (u32)block, track, cyl, head, sect);
695 /* Check whether the converted CHS can fit.
699 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
702 tf->command = ATA_CMD_VERIFY;
703 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
713 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
714 /* "Invalid field in cbd" */
718 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
719 /* "Logical Block Address out of range" */
723 qc->scsicmd->result = SAM_STAT_GOOD;
728 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
729 * @qc: Storage for translated ATA taskfile
730 * @scsicmd: SCSI command to translate
732 * Converts any of six SCSI read/write commands into the
733 * ATA counterpart, including starting sector (LBA),
734 * sector count, and taking into account the device's LBA48
737 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
738 * %WRITE_16 are currently supported.
741 * spin_lock_irqsave(host_set lock)
744 * Zero on success, non-zero on error.
747 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
749 struct ata_taskfile *tf = &qc->tf;
750 struct ata_device *dev = qc->dev;
754 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
756 if (scsicmd[0] == WRITE_10 || scsicmd[0] == WRITE_6 ||
757 scsicmd[0] == WRITE_16)
758 tf->flags |= ATA_TFLAG_WRITE;
760 /* Calculate the SCSI LBA and transfer length. */
761 switch (scsicmd[0]) {
764 scsi_10_lba_len(scsicmd, &block, &n_block);
768 scsi_6_lba_len(scsicmd, &block, &n_block);
770 /* for 6-byte r/w commands, transfer length 0
771 * means 256 blocks of data, not 0 block.
778 scsi_16_lba_len(scsicmd, &block, &n_block);
781 DPRINTK("no-byte command\n");
785 /* Check and compose ATA command */
787 /* For 10-byte and 16-byte SCSI R/W commands, transfer
788 * length 0 means transfer 0 block of data.
789 * However, for ATA R/W commands, sector count 0 means
790 * 256 or 65536 sectors, not 0 sectors as in SCSI.
794 if (dev->flags & ATA_DFLAG_LBA) {
795 tf->flags |= ATA_TFLAG_LBA;
797 if (dev->flags & ATA_DFLAG_LBA48) {
798 /* The request -may- be too large for LBA48. */
799 if ((block >> 48) || (n_block > 65536))
803 tf->flags |= ATA_TFLAG_LBA48;
805 tf->hob_nsect = (n_block >> 8) & 0xff;
807 tf->hob_lbah = (block >> 40) & 0xff;
808 tf->hob_lbam = (block >> 32) & 0xff;
809 tf->hob_lbal = (block >> 24) & 0xff;
813 /* The request -may- be too large for LBA28. */
814 if ((block >> 28) || (n_block > 256))
817 tf->device |= (block >> 24) & 0xf;
820 ata_rwcmd_protocol(qc);
823 tf->nsect = n_block & 0xff;
825 tf->lbah = (block >> 16) & 0xff;
826 tf->lbam = (block >> 8) & 0xff;
827 tf->lbal = block & 0xff;
829 tf->device |= ATA_LBA;
832 u32 sect, head, cyl, track;
834 /* The request -may- be too large for CHS addressing. */
835 if ((block >> 28) || (n_block > 256))
838 ata_rwcmd_protocol(qc);
840 /* Convert LBA to CHS */
841 track = (u32)block / dev->sectors;
842 cyl = track / dev->heads;
843 head = track % dev->heads;
844 sect = (u32)block % dev->sectors + 1;
846 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
847 (u32)block, track, cyl, head, sect);
849 /* Check whether the converted CHS can fit.
853 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
857 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
867 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x24, 0x0);
868 /* "Invalid field in cbd" */
872 ata_scsi_set_sense(qc->scsicmd, ILLEGAL_REQUEST, 0x21, 0x0);
873 /* "Logical Block Address out of range" */
877 qc->scsicmd->result = SAM_STAT_GOOD;
881 static int ata_scsi_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat)
883 struct scsi_cmnd *cmd = qc->scsicmd;
885 if (unlikely(drv_stat & (ATA_ERR | ATA_BUSY | ATA_DRQ)))
886 ata_to_sense_error(qc, drv_stat);
888 cmd->result = SAM_STAT_GOOD;
896 * ata_scsi_translate - Translate then issue SCSI command to ATA device
897 * @ap: ATA port to which the command is addressed
898 * @dev: ATA device to which the command is addressed
899 * @cmd: SCSI command to execute
900 * @done: SCSI command completion function
901 * @xlat_func: Actor which translates @cmd to an ATA taskfile
903 * Our ->queuecommand() function has decided that the SCSI
904 * command issued can be directly translated into an ATA
905 * command, rather than handled internally.
907 * This function sets up an ata_queued_cmd structure for the
908 * SCSI command, and sends that ata_queued_cmd to the hardware.
910 * The xlat_func argument (actor) returns 0 if ready to execute
911 * ATA command, else 1 to finish translation. If 1 is returned
912 * then cmd->result (and possibly cmd->sense_buffer) are assumed
913 * to be set reflecting an error condition or clean (early)
917 * spin_lock_irqsave(host_set lock)
920 static void ata_scsi_translate(struct ata_port *ap, struct ata_device *dev,
921 struct scsi_cmnd *cmd,
922 void (*done)(struct scsi_cmnd *),
923 ata_xlat_func_t xlat_func)
925 struct ata_queued_cmd *qc;
926 u8 *scsicmd = cmd->cmnd;
930 qc = ata_scsi_qc_new(ap, dev, cmd, done);
934 /* data is present; dma-map it */
935 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
936 cmd->sc_data_direction == DMA_TO_DEVICE) {
937 if (unlikely(cmd->request_bufflen < 1)) {
938 printk(KERN_WARNING "ata%u(%u): WARNING: zero len r/w req\n",
944 ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
946 ata_sg_init_one(qc, cmd->request_buffer,
947 cmd->request_bufflen);
949 qc->dma_dir = cmd->sc_data_direction;
952 qc->complete_fn = ata_scsi_qc_complete;
954 if (xlat_func(qc, scsicmd))
957 /* select device, send command to hardware */
958 if (ata_qc_issue(qc))
967 DPRINTK("EXIT - early finish (good or error)\n");
973 cmd->result = (DID_ERROR << 16);
975 DPRINTK("EXIT - internal\n");
980 * ata_scsi_rbuf_get - Map response buffer.
981 * @cmd: SCSI command containing buffer to be mapped.
982 * @buf_out: Pointer to mapped area.
984 * Maps buffer contained within SCSI command @cmd.
987 * spin_lock_irqsave(host_set lock)
990 * Length of response buffer.
993 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
999 struct scatterlist *sg;
1001 sg = (struct scatterlist *) cmd->request_buffer;
1002 buf = kmap_atomic(sg->page, KM_USER0) + sg->offset;
1003 buflen = sg->length;
1005 buf = cmd->request_buffer;
1006 buflen = cmd->request_bufflen;
1014 * ata_scsi_rbuf_put - Unmap response buffer.
1015 * @cmd: SCSI command containing buffer to be unmapped.
1016 * @buf: buffer to unmap
1018 * Unmaps response buffer contained within @cmd.
1021 * spin_lock_irqsave(host_set lock)
1024 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
1027 struct scatterlist *sg;
1029 sg = (struct scatterlist *) cmd->request_buffer;
1030 kunmap_atomic(buf - sg->offset, KM_USER0);
1035 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1036 * @args: device IDENTIFY data / SCSI command of interest.
1037 * @actor: Callback hook for desired SCSI command simulator
1039 * Takes care of the hard work of simulating a SCSI command...
1040 * Mapping the response buffer, calling the command's handler,
1041 * and handling the handler's return value. This return value
1042 * indicates whether the handler wishes the SCSI command to be
1043 * completed successfully (0), or not (in which case cmd->result
1044 * and sense buffer are assumed to be set).
1047 * spin_lock_irqsave(host_set lock)
1050 void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1051 unsigned int (*actor) (struct ata_scsi_args *args,
1052 u8 *rbuf, unsigned int buflen))
1055 unsigned int buflen, rc;
1056 struct scsi_cmnd *cmd = args->cmd;
1058 buflen = ata_scsi_rbuf_get(cmd, &rbuf);
1059 memset(rbuf, 0, buflen);
1060 rc = actor(args, rbuf, buflen);
1061 ata_scsi_rbuf_put(cmd, rbuf);
1064 cmd->result = SAM_STAT_GOOD;
1069 * ata_scsiop_inq_std - Simulate INQUIRY command
1070 * @args: device IDENTIFY data / SCSI command of interest.
1071 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1072 * @buflen: Response buffer length.
1074 * Returns standard device identification data associated
1075 * with non-EVPD INQUIRY command output.
1078 * spin_lock_irqsave(host_set lock)
1081 unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
1082 unsigned int buflen)
1087 0x5, /* claim SPC-3 version compatibility */
1092 /* set scsi removeable (RMB) bit per ata bit */
1093 if (ata_id_removeable(args->id))
1098 memcpy(rbuf, hdr, sizeof(hdr));
1101 memcpy(&rbuf[8], "ATA ", 8);
1102 ata_dev_id_string(args->id, &rbuf[16], ATA_ID_PROD_OFS, 16);
1103 ata_dev_id_string(args->id, &rbuf[32], ATA_ID_FW_REV_OFS, 4);
1104 if (rbuf[32] == 0 || rbuf[32] == ' ')
1105 memcpy(&rbuf[32], "n/a ", 4);
1109 const u8 versions[] = {
1110 0x60, /* SAM-3 (no version claimed) */
1113 0x20, /* SBC-2 (no version claimed) */
1116 0x60 /* SPC-3 (no version claimed) */
1119 memcpy(rbuf + 59, versions, sizeof(versions));
1126 * ata_scsiop_inq_00 - Simulate INQUIRY EVPD page 0, list of pages
1127 * @args: device IDENTIFY data / SCSI command of interest.
1128 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1129 * @buflen: Response buffer length.
1131 * Returns list of inquiry EVPD pages available.
1134 * spin_lock_irqsave(host_set lock)
1137 unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
1138 unsigned int buflen)
1140 const u8 pages[] = {
1141 0x00, /* page 0x00, this page */
1142 0x80, /* page 0x80, unit serial no page */
1143 0x83 /* page 0x83, device ident page */
1145 rbuf[3] = sizeof(pages); /* number of supported EVPD pages */
1148 memcpy(rbuf + 4, pages, sizeof(pages));
1154 * ata_scsiop_inq_80 - Simulate INQUIRY EVPD page 80, device serial number
1155 * @args: device IDENTIFY data / SCSI command of interest.
1156 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1157 * @buflen: Response buffer length.
1159 * Returns ATA device serial number.
1162 * spin_lock_irqsave(host_set lock)
1165 unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
1166 unsigned int buflen)
1170 0x80, /* this page code */
1172 ATA_SERNO_LEN, /* page len */
1174 memcpy(rbuf, hdr, sizeof(hdr));
1176 if (buflen > (ATA_SERNO_LEN + 4 - 1))
1177 ata_dev_id_string(args->id, (unsigned char *) &rbuf[4],
1178 ATA_ID_SERNO_OFS, ATA_SERNO_LEN);
1183 static const char *inq_83_str = "Linux ATA-SCSI simulator";
1186 * ata_scsiop_inq_83 - Simulate INQUIRY EVPD page 83, device identity
1187 * @args: device IDENTIFY data / SCSI command of interest.
1188 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1189 * @buflen: Response buffer length.
1191 * Returns device identification. Currently hardcoded to
1192 * return "Linux ATA-SCSI simulator".
1195 * spin_lock_irqsave(host_set lock)
1198 unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
1199 unsigned int buflen)
1201 rbuf[1] = 0x83; /* this page code */
1202 rbuf[3] = 4 + strlen(inq_83_str); /* page len */
1204 /* our one and only identification descriptor (vendor-specific) */
1205 if (buflen > (strlen(inq_83_str) + 4 + 4 - 1)) {
1206 rbuf[4 + 0] = 2; /* code set: ASCII */
1207 rbuf[4 + 3] = strlen(inq_83_str);
1208 memcpy(rbuf + 4 + 4, inq_83_str, strlen(inq_83_str));
1215 * ata_scsiop_noop - Command handler that simply returns success.
1216 * @args: device IDENTIFY data / SCSI command of interest.
1217 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1218 * @buflen: Response buffer length.
1220 * No operation. Simply returns success to caller, to indicate
1221 * that the caller should successfully complete this SCSI command.
1224 * spin_lock_irqsave(host_set lock)
1227 unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
1228 unsigned int buflen)
1235 * ata_msense_push - Push data onto MODE SENSE data output buffer
1236 * @ptr_io: (input/output) Location to store more output data
1237 * @last: End of output data buffer
1238 * @buf: Pointer to BLOB being added to output buffer
1239 * @buflen: Length of BLOB
1241 * Store MODE SENSE data on an output buffer.
1247 static void ata_msense_push(u8 **ptr_io, const u8 *last,
1248 const u8 *buf, unsigned int buflen)
1252 if ((ptr + buflen - 1) > last)
1255 memcpy(ptr, buf, buflen);
1263 * ata_msense_caching - Simulate MODE SENSE caching info page
1264 * @id: device IDENTIFY data
1265 * @ptr_io: (input/output) Location to store more output data
1266 * @last: End of output data buffer
1268 * Generate a caching info page, which conditionally indicates
1269 * write caching to the SCSI layer, depending on device
1276 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
1280 0x8, /* page code */
1281 0x12, /* page length */
1282 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 10 zeroes */
1283 0, 0, 0, 0, 0, 0, 0, 0 /* 8 zeroes */
1286 if (ata_id_wcache_enabled(id))
1287 page[2] |= (1 << 2); /* write cache enable */
1288 if (!ata_id_rahead_enabled(id))
1289 page[12] |= (1 << 5); /* disable read ahead */
1291 ata_msense_push(ptr_io, last, page, sizeof(page));
1292 return sizeof(page);
1296 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
1297 * @dev: Device associated with this MODE SENSE command
1298 * @ptr_io: (input/output) Location to store more output data
1299 * @last: End of output data buffer
1301 * Generate a generic MODE SENSE control mode page.
1307 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
1309 const u8 page[] = {0xa, 0xa, 6, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 30};
1311 /* byte 2: set the descriptor format sense data bit (bit 2)
1312 * since we need to support returning this format for SAT
1313 * commands and any SCSI commands against a 48b LBA device.
1316 ata_msense_push(ptr_io, last, page, sizeof(page));
1317 return sizeof(page);
1321 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
1322 * @dev: Device associated with this MODE SENSE command
1323 * @ptr_io: (input/output) Location to store more output data
1324 * @last: End of output data buffer
1326 * Generate a generic MODE SENSE r/w error recovery page.
1332 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
1335 0x1, /* page code */
1336 0xa, /* page length */
1337 (1 << 7) | (1 << 6), /* note auto r/w reallocation */
1338 0, 0, 0, 0, 0, 0, 0, 0, 0 /* 9 zeroes */
1341 ata_msense_push(ptr_io, last, page, sizeof(page));
1342 return sizeof(page);
1346 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
1347 * @args: device IDENTIFY data / SCSI command of interest.
1348 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1349 * @buflen: Response buffer length.
1351 * Simulate MODE SENSE commands.
1354 * spin_lock_irqsave(host_set lock)
1357 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
1358 unsigned int buflen)
1360 u8 *scsicmd = args->cmd->cmnd, *p, *last;
1361 unsigned int page_control, six_byte, output_len;
1365 six_byte = (scsicmd[0] == MODE_SENSE);
1367 /* we only support saved and current values (which we treat
1368 * in the same manner)
1370 page_control = scsicmd[2] >> 6;
1371 switch (page_control) {
1372 case 0: /* current */
1373 break; /* supported */
1375 goto saving_not_supp;
1376 case 1: /* changeable */
1377 case 2: /* defaults */
1387 p = rbuf + output_len;
1388 last = rbuf + buflen - 1;
1390 switch(scsicmd[2] & 0x3f) {
1391 case 0x01: /* r/w error recovery */
1392 output_len += ata_msense_rw_recovery(&p, last);
1395 case 0x08: /* caching */
1396 output_len += ata_msense_caching(args->id, &p, last);
1399 case 0x0a: { /* control mode */
1400 output_len += ata_msense_ctl_mode(&p, last);
1404 case 0x3f: /* all pages */
1405 output_len += ata_msense_rw_recovery(&p, last);
1406 output_len += ata_msense_caching(args->id, &p, last);
1407 output_len += ata_msense_ctl_mode(&p, last);
1410 default: /* invalid page code */
1416 rbuf[0] = output_len;
1419 rbuf[0] = output_len >> 8;
1420 rbuf[1] = output_len;
1426 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
1427 /* "Invalid field in cbd" */
1431 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
1432 /* "Saving parameters not supported" */
1437 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
1438 * @args: device IDENTIFY data / SCSI command of interest.
1439 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1440 * @buflen: Response buffer length.
1442 * Simulate READ CAPACITY commands.
1445 * spin_lock_irqsave(host_set lock)
1448 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
1449 unsigned int buflen)
1456 if (ata_id_has_lba(args->id)) {
1457 if (ata_id_has_lba48(args->id))
1458 n_sectors = ata_id_u64(args->id, 100);
1460 n_sectors = ata_id_u32(args->id, 60);
1462 /* CHS default translation */
1463 n_sectors = args->id[1] * args->id[3] * args->id[6];
1465 if (ata_id_current_chs_valid(args->id))
1466 /* CHS current translation */
1467 n_sectors = ata_id_u32(args->id, 57);
1470 n_sectors--; /* ATA TotalUserSectors - 1 */
1472 if (args->cmd->cmnd[0] == READ_CAPACITY) {
1473 if( n_sectors >= 0xffffffffULL )
1474 tmp = 0xffffffff ; /* Return max count on overflow */
1478 /* sector count, 32-bit */
1479 rbuf[0] = tmp >> (8 * 3);
1480 rbuf[1] = tmp >> (8 * 2);
1481 rbuf[2] = tmp >> (8 * 1);
1485 tmp = ATA_SECT_SIZE;
1490 /* sector count, 64-bit */
1491 tmp = n_sectors >> (8 * 4);
1492 rbuf[2] = tmp >> (8 * 3);
1493 rbuf[3] = tmp >> (8 * 2);
1494 rbuf[4] = tmp >> (8 * 1);
1497 rbuf[6] = tmp >> (8 * 3);
1498 rbuf[7] = tmp >> (8 * 2);
1499 rbuf[8] = tmp >> (8 * 1);
1503 tmp = ATA_SECT_SIZE;
1504 rbuf[12] = tmp >> 8;
1512 * ata_scsiop_report_luns - Simulate REPORT LUNS command
1513 * @args: device IDENTIFY data / SCSI command of interest.
1514 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1515 * @buflen: Response buffer length.
1517 * Simulate REPORT LUNS command.
1520 * spin_lock_irqsave(host_set lock)
1523 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
1524 unsigned int buflen)
1527 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
1533 * ata_scsi_set_sense - Set SCSI sense data and status
1534 * @cmd: SCSI request to be handled
1535 * @sk: SCSI-defined sense key
1536 * @asc: SCSI-defined additional sense code
1537 * @ascq: SCSI-defined additional sense code qualifier
1539 * Helper function that builds a valid fixed format, current
1540 * response code and the given sense key (sk), additional sense
1541 * code (asc) and additional sense code qualifier (ascq) with
1542 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and
1543 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
1549 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
1551 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1553 cmd->sense_buffer[0] = 0x70; /* fixed format, current */
1554 cmd->sense_buffer[2] = sk;
1555 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */
1556 cmd->sense_buffer[12] = asc;
1557 cmd->sense_buffer[13] = ascq;
1561 * ata_scsi_badcmd - End a SCSI request with an error
1562 * @cmd: SCSI request to be handled
1563 * @done: SCSI command completion function
1564 * @asc: SCSI-defined additional sense code
1565 * @ascq: SCSI-defined additional sense code qualifier
1567 * Helper function that completes a SCSI command with
1568 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
1569 * and the specified additional sense codes.
1572 * spin_lock_irqsave(host_set lock)
1575 void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
1578 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
1583 void atapi_request_sense(struct ata_port *ap, struct ata_device *dev,
1584 struct scsi_cmnd *cmd)
1586 DECLARE_COMPLETION(wait);
1587 struct ata_queued_cmd *qc;
1588 unsigned long flags;
1591 DPRINTK("ATAPI request sense\n");
1593 qc = ata_qc_new_init(ap, dev);
1596 /* FIXME: is this needed? */
1597 memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
1599 ata_sg_init_one(qc, cmd->sense_buffer, sizeof(cmd->sense_buffer));
1600 qc->dma_dir = DMA_FROM_DEVICE;
1602 memset(&qc->cdb, 0, ap->cdb_len);
1603 qc->cdb[0] = REQUEST_SENSE;
1604 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
1606 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1607 qc->tf.command = ATA_CMD_PACKET;
1609 qc->tf.protocol = ATA_PROT_ATAPI;
1610 qc->tf.lbam = (8 * 1024) & 0xff;
1611 qc->tf.lbah = (8 * 1024) >> 8;
1612 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
1614 qc->waiting = &wait;
1615 qc->complete_fn = ata_qc_complete_noop;
1617 spin_lock_irqsave(&ap->host_set->lock, flags);
1618 rc = ata_qc_issue(qc);
1619 spin_unlock_irqrestore(&ap->host_set->lock, flags);
1622 ata_port_disable(ap);
1624 wait_for_completion(&wait);
1629 static int atapi_qc_complete(struct ata_queued_cmd *qc, u8 drv_stat)
1631 struct scsi_cmnd *cmd = qc->scsicmd;
1633 VPRINTK("ENTER, drv_stat == 0x%x\n", drv_stat);
1635 if (unlikely(drv_stat & (ATA_BUSY | ATA_DRQ)))
1636 ata_to_sense_error(qc, drv_stat);
1638 else if (unlikely(drv_stat & ATA_ERR)) {
1639 DPRINTK("request check condition\n");
1641 /* FIXME: command completion with check condition
1642 * but no sense causes the error handler to run,
1643 * which then issues REQUEST SENSE, fills in the sense
1644 * buffer, and completes the command (for the second
1645 * time). We need to issue REQUEST SENSE some other
1646 * way, to avoid completing the command twice.
1648 cmd->result = SAM_STAT_CHECK_CONDITION;
1656 u8 *scsicmd = cmd->cmnd;
1658 if (scsicmd[0] == INQUIRY) {
1660 unsigned int buflen;
1662 buflen = ata_scsi_rbuf_get(cmd, &buf);
1664 /* ATAPI devices typically report zero for their SCSI version,
1665 * and sometimes deviate from the spec WRT response data
1666 * format. If SCSI version is reported as zero like normal,
1667 * then we make the following fixups: 1) Fake MMC-5 version,
1668 * to indicate to the Linux scsi midlayer this is a modern
1669 * device. 2) Ensure response data format / ATAPI information
1670 * are always correct.
1672 /* FIXME: do we ever override EVPD pages and the like, with
1680 ata_scsi_rbuf_put(cmd, buf);
1683 cmd->result = SAM_STAT_GOOD;
1690 * atapi_xlat - Initialize PACKET taskfile
1691 * @qc: command structure to be initialized
1692 * @scsicmd: SCSI CDB associated with this PACKET command
1695 * spin_lock_irqsave(host_set lock)
1698 * Zero on success, non-zero on failure.
1701 static unsigned int atapi_xlat(struct ata_queued_cmd *qc, const u8 *scsicmd)
1703 struct scsi_cmnd *cmd = qc->scsicmd;
1704 struct ata_device *dev = qc->dev;
1705 int using_pio = (dev->flags & ATA_DFLAG_PIO);
1706 int nodata = (cmd->sc_data_direction == DMA_NONE);
1709 /* Check whether ATAPI DMA is safe */
1710 if (ata_check_atapi_dma(qc))
1713 memcpy(&qc->cdb, scsicmd, qc->ap->cdb_len);
1715 qc->complete_fn = atapi_qc_complete;
1717 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1718 if (cmd->sc_data_direction == DMA_TO_DEVICE) {
1719 qc->tf.flags |= ATA_TFLAG_WRITE;
1720 DPRINTK("direction: write\n");
1723 qc->tf.command = ATA_CMD_PACKET;
1725 /* no data, or PIO data xfer */
1726 if (using_pio || nodata) {
1728 qc->tf.protocol = ATA_PROT_ATAPI_NODATA;
1730 qc->tf.protocol = ATA_PROT_ATAPI;
1731 qc->tf.lbam = (8 * 1024) & 0xff;
1732 qc->tf.lbah = (8 * 1024) >> 8;
1737 qc->tf.protocol = ATA_PROT_ATAPI_DMA;
1738 qc->tf.feature |= ATAPI_PKT_DMA;
1740 #ifdef ATAPI_ENABLE_DMADIR
1741 /* some SATA bridges need us to indicate data xfer direction */
1742 if (cmd->sc_data_direction != DMA_TO_DEVICE)
1743 qc->tf.feature |= ATAPI_DMADIR;
1747 qc->nbytes = cmd->bufflen;
1753 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
1754 * @ap: ATA port to which the device is attached
1755 * @scsidev: SCSI device from which we derive the ATA device
1757 * Given various information provided in struct scsi_cmnd,
1758 * map that onto an ATA bus, and using that mapping
1759 * determine which ata_device is associated with the
1760 * SCSI command to be sent.
1763 * spin_lock_irqsave(host_set lock)
1766 * Associated ATA device, or %NULL if not found.
1769 static struct ata_device *
1770 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
1772 struct ata_device *dev;
1774 /* skip commands not addressed to targets we simulate */
1775 if (likely(scsidev->id < ATA_MAX_DEVICES))
1776 dev = &ap->device[scsidev->id];
1780 if (unlikely((scsidev->channel != 0) ||
1781 (scsidev->lun != 0)))
1784 if (unlikely(!ata_dev_present(dev)))
1787 if (!atapi_enabled) {
1788 if (unlikely(dev->class == ATA_DEV_ATAPI))
1796 * ata_get_xlat_func - check if SCSI to ATA translation is possible
1798 * @cmd: SCSI command opcode to consider
1800 * Look up the SCSI command given, and determine whether the
1801 * SCSI command is to be translated or simulated.
1804 * Pointer to translation function if possible, %NULL if not.
1807 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
1817 return ata_scsi_rw_xlat;
1819 case SYNCHRONIZE_CACHE:
1820 if (ata_try_flush_cache(dev))
1821 return ata_scsi_flush_xlat;
1826 return ata_scsi_verify_xlat;
1828 return ata_scsi_start_stop_xlat;
1835 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
1836 * @ap: ATA port to which the command was being sent
1837 * @cmd: SCSI command to dump
1839 * Prints the contents of a SCSI command via printk().
1842 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
1843 struct scsi_cmnd *cmd)
1846 struct scsi_device *scsidev = cmd->device;
1847 u8 *scsicmd = cmd->cmnd;
1849 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
1851 scsidev->channel, scsidev->id, scsidev->lun,
1852 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
1853 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
1859 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
1860 * @cmd: SCSI command to be sent
1861 * @done: Completion function, called when command is complete
1863 * In some cases, this function translates SCSI commands into
1864 * ATA taskfiles, and queues the taskfiles to be sent to
1865 * hardware. In other cases, this function simulates a
1866 * SCSI device by evaluating and responding to certain
1867 * SCSI commands. This creates the overall effect of
1868 * ATA and ATAPI devices appearing as SCSI devices.
1871 * Releases scsi-layer-held lock, and obtains host_set lock.
1877 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
1879 struct ata_port *ap;
1880 struct ata_device *dev;
1881 struct scsi_device *scsidev = cmd->device;
1883 ap = (struct ata_port *) &scsidev->host->hostdata[0];
1885 ata_scsi_dump_cdb(ap, cmd);
1887 dev = ata_scsi_find_dev(ap, scsidev);
1888 if (unlikely(!dev)) {
1889 cmd->result = (DID_BAD_TARGET << 16);
1894 if (dev->class == ATA_DEV_ATA) {
1895 ata_xlat_func_t xlat_func = ata_get_xlat_func(dev,
1899 ata_scsi_translate(ap, dev, cmd, done, xlat_func);
1901 ata_scsi_simulate(dev->id, cmd, done);
1903 ata_scsi_translate(ap, dev, cmd, done, atapi_xlat);
1910 * ata_scsi_simulate - simulate SCSI command on ATA device
1911 * @id: current IDENTIFY data for target device.
1912 * @cmd: SCSI command being sent to device.
1913 * @done: SCSI command completion function.
1915 * Interprets and directly executes a select list of SCSI commands
1916 * that can be handled internally.
1919 * spin_lock_irqsave(host_set lock)
1922 void ata_scsi_simulate(u16 *id,
1923 struct scsi_cmnd *cmd,
1924 void (*done)(struct scsi_cmnd *))
1926 struct ata_scsi_args args;
1927 const u8 *scsicmd = cmd->cmnd;
1933 switch(scsicmd[0]) {
1934 /* no-op's, complete with success */
1935 case SYNCHRONIZE_CACHE:
1939 case TEST_UNIT_READY:
1940 case FORMAT_UNIT: /* FIXME: correct? */
1941 case SEND_DIAGNOSTIC: /* FIXME: correct? */
1942 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
1946 if (scsicmd[1] & 2) /* is CmdDt set? */
1947 ata_scsi_invalid_field(cmd, done);
1948 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
1949 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
1950 else if (scsicmd[2] == 0x00)
1951 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
1952 else if (scsicmd[2] == 0x80)
1953 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
1954 else if (scsicmd[2] == 0x83)
1955 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
1957 ata_scsi_invalid_field(cmd, done);
1962 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
1965 case MODE_SELECT: /* unconditionally return */
1966 case MODE_SELECT_10: /* bad-field-in-cdb */
1967 ata_scsi_invalid_field(cmd, done);
1971 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
1974 case SERVICE_ACTION_IN:
1975 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
1976 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
1978 ata_scsi_invalid_field(cmd, done);
1982 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
1985 /* mandantory commands we haven't implemented yet */
1988 /* all other commands */
1990 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
1991 /* "Invalid command operation code" */
1997 void ata_scsi_scan_host(struct ata_port *ap)
1999 struct ata_device *dev;
2002 if (ap->flags & ATA_FLAG_PORT_DISABLED)
2005 for (i = 0; i < ATA_MAX_DEVICES; i++) {
2006 dev = &ap->device[i];
2008 if (ata_dev_present(dev))
2009 scsi_scan_target(&ap->host->shost_gendev, 0, i, 0, 0);