2 * libata-scsi.c - helper library for ATA
4 * Maintained by: Jeff Garzik <jgarzik@pobox.com>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
30 * Hardware documentation available from
31 * - http://www.t10.org/
32 * - http://www.t13.org/
36 #include <linux/kernel.h>
37 #include <linux/blkdev.h>
38 #include <linux/spinlock.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_host.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_eh.h>
43 #include <scsi/scsi_device.h>
44 #include <scsi/scsi_tcq.h>
45 #include <scsi/scsi_transport.h>
46 #include <linux/libata.h>
47 #include <linux/hdreg.h>
48 #include <linux/uaccess.h>
52 #define SECTOR_SIZE 512
54 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
56 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
57 const struct scsi_device *scsidev);
58 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
59 const struct scsi_device *scsidev);
60 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
61 unsigned int id, unsigned int lun);
64 #define RW_RECOVERY_MPAGE 0x1
65 #define RW_RECOVERY_MPAGE_LEN 12
66 #define CACHE_MPAGE 0x8
67 #define CACHE_MPAGE_LEN 20
68 #define CONTROL_MPAGE 0xa
69 #define CONTROL_MPAGE_LEN 12
70 #define ALL_MPAGES 0x3f
71 #define ALL_SUB_MPAGES 0xff
74 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
76 RW_RECOVERY_MPAGE_LEN - 2,
78 0, /* read retry count */
80 0, /* write retry count */
84 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
87 0, /* contains WCE, needs to be 0 for logic */
88 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, /* contains DRA, needs to be 0 for logic */
93 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
95 CONTROL_MPAGE_LEN - 2,
96 2, /* DSENSE=0, GLTSD=1 */
97 0, /* [QAM+QERR may be 1, see 05-359r1] */
98 0, 0, 0, 0, 0xff, 0xff,
99 0, 30 /* extended self test time, see 05-359r1 */
103 * libata transport template. libata doesn't do real transport stuff.
104 * It just needs the eh_timed_out hook.
106 static struct scsi_transport_template ata_scsi_transport_template = {
107 .eh_strategy_handler = ata_scsi_error,
108 .eh_timed_out = ata_scsi_timed_out,
109 .user_scan = ata_scsi_user_scan,
113 static const struct {
116 } link_pm_policy[] = {
117 { NOT_AVAILABLE, "max_performance" },
118 { MIN_POWER, "min_power" },
119 { MAX_PERFORMANCE, "max_performance" },
120 { MEDIUM_POWER, "medium_power" },
123 static const char *ata_scsi_lpm_get(enum link_pm policy)
127 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++)
128 if (link_pm_policy[i].value == policy)
129 return link_pm_policy[i].name;
134 static ssize_t ata_scsi_lpm_put(struct class_device *class_dev,
135 const char *buf, size_t count)
137 struct Scsi_Host *shost = class_to_shost(class_dev);
138 struct ata_port *ap = ata_shost_to_port(shost);
139 enum link_pm policy = 0;
143 * we are skipping array location 0 on purpose - this
144 * is because a value of NOT_AVAILABLE is displayed
145 * to the user as max_performance, but when the user
146 * writes "max_performance", they actually want the
147 * value to match MAX_PERFORMANCE.
149 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) {
150 const int len = strlen(link_pm_policy[i].name);
151 if (strncmp(link_pm_policy[i].name, buf, len) == 0 &&
153 policy = link_pm_policy[i].value;
160 ata_lpm_schedule(ap, policy);
165 ata_scsi_lpm_show(struct class_device *class_dev, char *buf)
167 struct Scsi_Host *shost = class_to_shost(class_dev);
168 struct ata_port *ap = ata_shost_to_port(shost);
170 ata_scsi_lpm_get(ap->pm_policy);
175 return snprintf(buf, 23, "%s\n", policy);
177 CLASS_DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
178 ata_scsi_lpm_show, ata_scsi_lpm_put);
179 EXPORT_SYMBOL_GPL(class_device_attr_link_power_management_policy);
181 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
182 void (*done)(struct scsi_cmnd *))
184 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
185 /* "Invalid field in cbd" */
190 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
191 * @sdev: SCSI device for which BIOS geometry is to be determined
192 * @bdev: block device associated with @sdev
193 * @capacity: capacity of SCSI device
194 * @geom: location to which geometry will be output
196 * Generic bios head/sector/cylinder calculator
197 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
198 * mapping. Some situations may arise where the disk is not
199 * bootable if this is not used.
202 * Defined by the SCSI layer. We don't really care.
207 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
208 sector_t capacity, int geom[])
212 sector_div(capacity, 255*63);
219 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
220 * @sdev: SCSI device to get identify data for
221 * @arg: User buffer area for identify data
224 * Defined by the SCSI layer. We don't really care.
227 * Zero on success, negative errno on error.
229 static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
231 struct ata_port *ap = ata_shost_to_port(sdev->host);
232 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
233 u16 __user *dst = arg;
239 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
242 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
243 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
246 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
247 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
250 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
251 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
258 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
259 * @scsidev: Device to which we are issuing command
260 * @arg: User provided data for issuing command
263 * Defined by the SCSI layer. We don't really care.
266 * Zero on success, negative errno on error.
268 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
271 u8 scsi_cmd[MAX_COMMAND_SIZE];
272 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
274 enum dma_data_direction data_dir;
280 if (copy_from_user(args, arg, sizeof(args)))
283 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
287 memset(scsi_cmd, 0, sizeof(scsi_cmd));
290 argsize = SECTOR_SIZE * args[3];
291 argbuf = kmalloc(argsize, GFP_KERNEL);
292 if (argbuf == NULL) {
297 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
298 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
299 block count in sector count field */
300 data_dir = DMA_FROM_DEVICE;
302 scsi_cmd[1] = (3 << 1); /* Non-data */
303 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
307 scsi_cmd[0] = ATA_16;
309 scsi_cmd[4] = args[2];
310 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
311 scsi_cmd[6] = args[3];
312 scsi_cmd[8] = args[1];
316 scsi_cmd[6] = args[1];
318 scsi_cmd[14] = args[0];
320 /* Good values for timeout and retries? Values below
321 from scsi_ioctl_send_command() for default case... */
322 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
323 sensebuf, (10*HZ), 5, 0);
325 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
326 u8 *desc = sensebuf + 8;
327 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
329 /* If we set cc then ATA pass-through will cause a
330 * check condition even if no error. Filter that. */
331 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
332 struct scsi_sense_hdr sshdr;
333 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
335 if (sshdr.sense_key == 0 &&
336 sshdr.asc == 0 && sshdr.ascq == 0)
337 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
340 /* Send userspace a few ATA registers (same as drivers/ide) */
341 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
342 desc[0] == 0x09) { /* code is "ATA Descriptor" */
343 args[0] = desc[13]; /* status */
344 args[1] = desc[3]; /* error */
345 args[2] = desc[5]; /* sector count (0:7) */
346 if (copy_to_user(arg, args, sizeof(args)))
358 && copy_to_user(arg + sizeof(args), argbuf, argsize))
367 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
368 * @scsidev: Device to which we are issuing command
369 * @arg: User provided data for issuing command
372 * Defined by the SCSI layer. We don't really care.
375 * Zero on success, negative errno on error.
377 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
380 u8 scsi_cmd[MAX_COMMAND_SIZE];
381 u8 args[7], *sensebuf = NULL;
387 if (copy_from_user(args, arg, sizeof(args)))
390 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
394 memset(scsi_cmd, 0, sizeof(scsi_cmd));
395 scsi_cmd[0] = ATA_16;
396 scsi_cmd[1] = (3 << 1); /* Non-data */
397 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
398 scsi_cmd[4] = args[1];
399 scsi_cmd[6] = args[2];
400 scsi_cmd[8] = args[3];
401 scsi_cmd[10] = args[4];
402 scsi_cmd[12] = args[5];
403 scsi_cmd[13] = args[6] & 0x4f;
404 scsi_cmd[14] = args[0];
406 /* Good values for timeout and retries? Values below
407 from scsi_ioctl_send_command() for default case... */
408 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
409 sensebuf, (10*HZ), 5, 0);
411 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
412 u8 *desc = sensebuf + 8;
413 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
415 /* If we set cc then ATA pass-through will cause a
416 * check condition even if no error. Filter that. */
417 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
418 struct scsi_sense_hdr sshdr;
419 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
421 if (sshdr.sense_key == 0 &&
422 sshdr.asc == 0 && sshdr.ascq == 0)
423 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
426 /* Send userspace ATA registers */
427 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
428 desc[0] == 0x09) {/* code is "ATA Descriptor" */
429 args[0] = desc[13]; /* status */
430 args[1] = desc[3]; /* error */
431 args[2] = desc[5]; /* sector count (0:7) */
432 args[3] = desc[7]; /* lbal */
433 args[4] = desc[9]; /* lbam */
434 args[5] = desc[11]; /* lbah */
435 args[6] = desc[12]; /* select */
436 if (copy_to_user(arg, args, sizeof(args)))
451 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
453 int val = -EINVAL, rc = -EINVAL;
456 case ATA_IOC_GET_IO32:
458 if (copy_to_user(arg, &val, 1))
462 case ATA_IOC_SET_IO32:
463 val = (unsigned long) arg;
468 case HDIO_GET_IDENTITY:
469 return ata_get_identity(scsidev, arg);
472 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
474 return ata_cmd_ioctl(scsidev, arg);
476 case HDIO_DRIVE_TASK:
477 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
479 return ata_task_ioctl(scsidev, arg);
490 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
491 * @dev: ATA device to which the new command is attached
492 * @cmd: SCSI command that originated this ATA command
493 * @done: SCSI command completion function
495 * Obtain a reference to an unused ata_queued_cmd structure,
496 * which is the basic libata structure representing a single
497 * ATA command sent to the hardware.
499 * If a command was available, fill in the SCSI-specific
500 * portions of the structure with information on the
504 * spin_lock_irqsave(host lock)
507 * Command allocated, or %NULL if none available.
509 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
510 struct scsi_cmnd *cmd,
511 void (*done)(struct scsi_cmnd *))
513 struct ata_queued_cmd *qc;
515 qc = ata_qc_new_init(dev);
520 qc->sg = scsi_sglist(cmd);
521 qc->n_elem = scsi_sg_count(cmd);
523 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
530 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
532 struct scsi_cmnd *scmd = qc->scsicmd;
534 qc->extrabytes = scmd->request->extra_len;
535 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
539 * ata_dump_status - user friendly display of error info
540 * @id: id of the port in question
541 * @tf: ptr to filled out taskfile
543 * Decode and dump the ATA error/status registers for the user so
544 * that they have some idea what really happened at the non
545 * make-believe layer.
548 * inherited from caller
550 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
552 u8 stat = tf->command, err = tf->feature;
554 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
555 if (stat & ATA_BUSY) {
556 printk("Busy }\n"); /* Data is not valid in this case */
558 if (stat & 0x40) printk("DriveReady ");
559 if (stat & 0x20) printk("DeviceFault ");
560 if (stat & 0x10) printk("SeekComplete ");
561 if (stat & 0x08) printk("DataRequest ");
562 if (stat & 0x04) printk("CorrectedError ");
563 if (stat & 0x02) printk("Index ");
564 if (stat & 0x01) printk("Error ");
568 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
569 if (err & 0x04) printk("DriveStatusError ");
571 if (err & 0x04) printk("BadCRC ");
572 else printk("Sector ");
574 if (err & 0x40) printk("UncorrectableError ");
575 if (err & 0x10) printk("SectorIdNotFound ");
576 if (err & 0x02) printk("TrackZeroNotFound ");
577 if (err & 0x01) printk("AddrMarkNotFound ");
584 * ata_to_sense_error - convert ATA error to SCSI error
585 * @id: ATA device number
586 * @drv_stat: value contained in ATA status register
587 * @drv_err: value contained in ATA error register
588 * @sk: the sense key we'll fill out
589 * @asc: the additional sense code we'll fill out
590 * @ascq: the additional sense code qualifier we'll fill out
591 * @verbose: be verbose
593 * Converts an ATA error into a SCSI error. Fill out pointers to
594 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
595 * format sense blocks.
598 * spin_lock_irqsave(host lock)
600 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
601 u8 *asc, u8 *ascq, int verbose)
605 /* Based on the 3ware driver translation table */
606 static const unsigned char sense_table[][4] = {
608 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
610 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
612 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
613 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
614 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
615 /* MC|ID|ABRT|TRK0|MARK */
616 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
618 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
619 /* Bad address mark */
620 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
622 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
624 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
625 /* Media change request */
626 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
628 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
630 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
632 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
633 /* BBD - block marked bad */
634 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
635 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
637 static const unsigned char stat_table[][4] = {
638 /* Must be first because BUSY means no other bits valid */
639 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
640 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
641 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
642 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
643 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
647 * Is this an error we can process/parse
649 if (drv_stat & ATA_BUSY) {
650 drv_err = 0; /* Ignore the err bits, they're invalid */
654 /* Look for drv_err */
655 for (i = 0; sense_table[i][0] != 0xFF; i++) {
656 /* Look for best matches first */
657 if ((sense_table[i][0] & drv_err) ==
659 *sk = sense_table[i][1];
660 *asc = sense_table[i][2];
661 *ascq = sense_table[i][3];
665 /* No immediate match */
667 printk(KERN_WARNING "ata%u: no sense translation for "
668 "error 0x%02x\n", id, drv_err);
671 /* Fall back to interpreting status bits */
672 for (i = 0; stat_table[i][0] != 0xFF; i++) {
673 if (stat_table[i][0] & drv_stat) {
674 *sk = stat_table[i][1];
675 *asc = stat_table[i][2];
676 *ascq = stat_table[i][3];
680 /* No error? Undecoded? */
682 printk(KERN_WARNING "ata%u: no sense translation for "
683 "status: 0x%02x\n", id, drv_stat);
685 /* We need a sensible error return here, which is tricky, and one
686 that won't cause people to do things like return a disk wrongly */
687 *sk = ABORTED_COMMAND;
693 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
694 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
695 id, drv_stat, drv_err, *sk, *asc, *ascq);
700 * ata_gen_passthru_sense - Generate check condition sense block.
701 * @qc: Command that completed.
703 * This function is specific to the ATA descriptor format sense
704 * block specified for the ATA pass through commands. Regardless
705 * of whether the command errored or not, return a sense
706 * block. Copy all controller registers into the sense
707 * block. Clear sense key, ASC & ASCQ if there is no error.
712 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
714 struct scsi_cmnd *cmd = qc->scsicmd;
715 struct ata_taskfile *tf = &qc->result_tf;
716 unsigned char *sb = cmd->sense_buffer;
717 unsigned char *desc = sb + 8;
718 int verbose = qc->ap->ops->error_handler == NULL;
720 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
722 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
725 * Use ata_to_sense_error() to map status register bits
726 * onto sense key, asc & ascq.
729 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
730 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
731 &sb[1], &sb[2], &sb[3], verbose);
736 * Sense data is current and format is descriptor.
742 /* set length of additional sense data */
747 * Copy registers into sense buffer.
750 desc[3] = tf->feature; /* == error reg */
755 desc[12] = tf->device;
756 desc[13] = tf->command; /* == status reg */
759 * Fill in Extend bit, and the high order bytes
762 if (tf->flags & ATA_TFLAG_LBA48) {
764 desc[4] = tf->hob_nsect;
765 desc[6] = tf->hob_lbal;
766 desc[8] = tf->hob_lbam;
767 desc[10] = tf->hob_lbah;
772 * ata_gen_ata_sense - generate a SCSI fixed sense block
773 * @qc: Command that we are erroring out
775 * Generate sense block for a failed ATA command @qc. Descriptor
776 * format is used to accomodate LBA48 block address.
781 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
783 struct ata_device *dev = qc->dev;
784 struct scsi_cmnd *cmd = qc->scsicmd;
785 struct ata_taskfile *tf = &qc->result_tf;
786 unsigned char *sb = cmd->sense_buffer;
787 unsigned char *desc = sb + 8;
788 int verbose = qc->ap->ops->error_handler == NULL;
791 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
793 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
795 /* sense data is current and format is descriptor */
798 /* Use ata_to_sense_error() to map status register bits
799 * onto sense key, asc & ascq.
802 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
803 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
804 &sb[1], &sb[2], &sb[3], verbose);
808 block = ata_tf_read_block(&qc->result_tf, dev);
810 /* information sense data descriptor */
815 desc[2] |= 0x80; /* valid */
816 desc[6] = block >> 40;
817 desc[7] = block >> 32;
818 desc[8] = block >> 24;
819 desc[9] = block >> 16;
820 desc[10] = block >> 8;
824 static void ata_scsi_sdev_config(struct scsi_device *sdev)
826 sdev->use_10_for_rw = 1;
827 sdev->use_10_for_ms = 1;
829 /* Schedule policy is determined by ->qc_defer() callback and
830 * it needs to see every deferred qc. Set dev_blocked to 1 to
831 * prevent SCSI midlayer from automatically deferring
834 sdev->max_device_blocked = 1;
838 * atapi_drain_needed - Check whether data transfer may overflow
839 * @rq: request to be checked
841 * ATAPI commands which transfer variable length data to host
842 * might overflow due to application error or hardare bug. This
843 * function checks whether overflow should be drained and ignored
850 * 1 if ; otherwise, 0.
852 static int atapi_drain_needed(struct request *rq)
854 if (likely(!blk_pc_request(rq)))
857 if (!rq->data_len || (rq->cmd_flags & REQ_RW))
860 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
863 static int ata_scsi_dev_config(struct scsi_device *sdev,
864 struct ata_device *dev)
866 /* configure max sectors */
867 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
869 if (dev->class == ATA_DEV_ATAPI) {
870 struct request_queue *q = sdev->request_queue;
873 /* set the min alignment and padding */
874 blk_queue_update_dma_alignment(sdev->request_queue,
876 blk_queue_dma_pad(sdev->request_queue, ATA_DMA_PAD_SZ - 1);
878 /* configure draining */
879 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
881 ata_dev_printk(dev, KERN_ERR,
882 "drain buffer allocation failed\n");
886 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
888 /* ATA devices must be sector aligned */
889 blk_queue_update_dma_alignment(sdev->request_queue,
891 sdev->manage_start_stop = 1;
894 if (dev->flags & ATA_DFLAG_AN)
895 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
897 if (dev->flags & ATA_DFLAG_NCQ) {
900 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
901 depth = min(ATA_MAX_QUEUE - 1, depth);
902 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
909 * ata_scsi_slave_config - Set SCSI device attributes
910 * @sdev: SCSI device to examine
912 * This is called before we actually start reading
913 * and writing to the device, to configure certain
914 * SCSI mid-layer behaviors.
917 * Defined by SCSI layer. We don't really care.
920 int ata_scsi_slave_config(struct scsi_device *sdev)
922 struct ata_port *ap = ata_shost_to_port(sdev->host);
923 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
926 ata_scsi_sdev_config(sdev);
929 rc = ata_scsi_dev_config(sdev, dev);
935 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
936 * @sdev: SCSI device to be destroyed
938 * @sdev is about to be destroyed for hot/warm unplugging. If
939 * this unplugging was initiated by libata as indicated by NULL
940 * dev->sdev, this function doesn't have to do anything.
941 * Otherwise, SCSI layer initiated warm-unplug is in progress.
942 * Clear dev->sdev, schedule the device for ATA detach and invoke
946 * Defined by SCSI layer. We don't really care.
948 void ata_scsi_slave_destroy(struct scsi_device *sdev)
950 struct ata_port *ap = ata_shost_to_port(sdev->host);
951 struct request_queue *q = sdev->request_queue;
953 struct ata_device *dev;
955 if (!ap->ops->error_handler)
958 spin_lock_irqsave(ap->lock, flags);
959 dev = __ata_scsi_find_dev(ap, sdev);
960 if (dev && dev->sdev) {
961 /* SCSI device already in CANCEL state, no need to offline it */
963 dev->flags |= ATA_DFLAG_DETACH;
964 ata_port_schedule_eh(ap);
966 spin_unlock_irqrestore(ap->lock, flags);
968 kfree(q->dma_drain_buffer);
969 q->dma_drain_buffer = NULL;
970 q->dma_drain_size = 0;
974 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
975 * @sdev: SCSI device to configure queue depth for
976 * @queue_depth: new queue depth
978 * This is libata standard hostt->change_queue_depth callback.
979 * SCSI will call into this callback when user tries to set queue
983 * SCSI layer (we don't care)
986 * Newly configured queue depth.
988 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
990 struct ata_port *ap = ata_shost_to_port(sdev->host);
991 struct ata_device *dev;
994 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
995 return sdev->queue_depth;
997 dev = ata_scsi_find_dev(ap, sdev);
998 if (!dev || !ata_dev_enabled(dev))
999 return sdev->queue_depth;
1002 spin_lock_irqsave(ap->lock, flags);
1003 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1004 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1005 dev->flags |= ATA_DFLAG_NCQ_OFF;
1008 spin_unlock_irqrestore(ap->lock, flags);
1010 /* limit and apply queue depth */
1011 queue_depth = min(queue_depth, sdev->host->can_queue);
1012 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1013 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1015 if (sdev->queue_depth == queue_depth)
1018 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1022 /* XXX: for spindown warning */
1023 static void ata_delayed_done_timerfn(unsigned long arg)
1025 struct scsi_cmnd *scmd = (void *)arg;
1027 scmd->scsi_done(scmd);
1030 /* XXX: for spindown warning */
1031 static void ata_delayed_done(struct scsi_cmnd *scmd)
1033 static struct timer_list timer;
1035 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd);
1036 mod_timer(&timer, jiffies + 5 * HZ);
1040 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1041 * @qc: Storage for translated ATA taskfile
1043 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1044 * (to start). Perhaps these commands should be preceded by
1045 * CHECK POWER MODE to see what power mode the device is already in.
1046 * [See SAT revision 5 at www.t10.org]
1049 * spin_lock_irqsave(host lock)
1052 * Zero on success, non-zero on error.
1054 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1056 struct scsi_cmnd *scmd = qc->scsicmd;
1057 struct ata_taskfile *tf = &qc->tf;
1058 const u8 *cdb = scmd->cmnd;
1060 if (scmd->cmd_len < 5)
1063 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1064 tf->protocol = ATA_PROT_NODATA;
1066 ; /* ignore IMMED bit, violates sat-r05 */
1069 goto invalid_fld; /* LOEJ bit set not supported */
1070 if (((cdb[4] >> 4) & 0xf) != 0)
1071 goto invalid_fld; /* power conditions not supported */
1073 if (qc->dev->horkage & ATA_HORKAGE_SKIP_PM) {
1074 /* the device lacks PM support, finish without doing anything */
1075 scmd->result = SAM_STAT_GOOD;
1080 tf->nsect = 1; /* 1 sector, lba=0 */
1082 if (qc->dev->flags & ATA_DFLAG_LBA) {
1083 tf->flags |= ATA_TFLAG_LBA;
1088 tf->device |= ATA_LBA;
1091 tf->lbal = 0x1; /* sect */
1092 tf->lbam = 0x0; /* cyl low */
1093 tf->lbah = 0x0; /* cyl high */
1096 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1098 /* XXX: This is for backward compatibility, will be
1099 * removed. Read Documentation/feature-removal-schedule.txt
1102 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) &&
1103 (system_state == SYSTEM_HALT ||
1104 system_state == SYSTEM_POWER_OFF)) {
1105 static unsigned long warned;
1107 if (!test_and_set_bit(0, &warned)) {
1108 ata_dev_printk(qc->dev, KERN_WARNING,
1109 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. "
1110 "UPDATE SHUTDOWN UTILITY\n");
1111 ata_dev_printk(qc->dev, KERN_WARNING,
1112 "For more info, visit "
1113 "http://linux-ata.org/shutdown.html\n");
1115 /* ->scsi_done is not used, use it for
1116 * delayed completion.
1118 scmd->scsi_done = qc->scsidone;
1119 qc->scsidone = ata_delayed_done;
1121 scmd->result = SAM_STAT_GOOD;
1125 /* Issue ATA STANDBY IMMEDIATE command */
1126 tf->command = ATA_CMD_STANDBYNOW1;
1130 * Standby and Idle condition timers could be implemented but that
1131 * would require libata to implement the Power condition mode page
1132 * and allow the user to change it. Changing mode pages requires
1133 * MODE SELECT to be implemented.
1139 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1140 /* "Invalid field in cbd" */
1146 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1147 * @qc: Storage for translated ATA taskfile
1149 * Sets up an ATA taskfile to issue FLUSH CACHE or
1153 * spin_lock_irqsave(host lock)
1156 * Zero on success, non-zero on error.
1158 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1160 struct ata_taskfile *tf = &qc->tf;
1162 tf->flags |= ATA_TFLAG_DEVICE;
1163 tf->protocol = ATA_PROT_NODATA;
1165 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1166 tf->command = ATA_CMD_FLUSH_EXT;
1168 tf->command = ATA_CMD_FLUSH;
1170 /* flush is critical for IO integrity, consider it an IO command */
1171 qc->flags |= ATA_QCFLAG_IO;
1177 * scsi_6_lba_len - Get LBA and transfer length
1178 * @cdb: SCSI command to translate
1180 * Calculate LBA and transfer length for 6-byte commands.
1184 * @plen: the transfer length
1186 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1191 VPRINTK("six-byte command\n");
1193 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1194 lba |= ((u64)cdb[2]) << 8;
1195 lba |= ((u64)cdb[3]);
1204 * scsi_10_lba_len - Get LBA and transfer length
1205 * @cdb: SCSI command to translate
1207 * Calculate LBA and transfer length for 10-byte commands.
1211 * @plen: the transfer length
1213 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1218 VPRINTK("ten-byte command\n");
1220 lba |= ((u64)cdb[2]) << 24;
1221 lba |= ((u64)cdb[3]) << 16;
1222 lba |= ((u64)cdb[4]) << 8;
1223 lba |= ((u64)cdb[5]);
1225 len |= ((u32)cdb[7]) << 8;
1226 len |= ((u32)cdb[8]);
1233 * scsi_16_lba_len - Get LBA and transfer length
1234 * @cdb: SCSI command to translate
1236 * Calculate LBA and transfer length for 16-byte commands.
1240 * @plen: the transfer length
1242 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1247 VPRINTK("sixteen-byte command\n");
1249 lba |= ((u64)cdb[2]) << 56;
1250 lba |= ((u64)cdb[3]) << 48;
1251 lba |= ((u64)cdb[4]) << 40;
1252 lba |= ((u64)cdb[5]) << 32;
1253 lba |= ((u64)cdb[6]) << 24;
1254 lba |= ((u64)cdb[7]) << 16;
1255 lba |= ((u64)cdb[8]) << 8;
1256 lba |= ((u64)cdb[9]);
1258 len |= ((u32)cdb[10]) << 24;
1259 len |= ((u32)cdb[11]) << 16;
1260 len |= ((u32)cdb[12]) << 8;
1261 len |= ((u32)cdb[13]);
1268 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1269 * @qc: Storage for translated ATA taskfile
1271 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1274 * spin_lock_irqsave(host lock)
1277 * Zero on success, non-zero on error.
1279 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1281 struct scsi_cmnd *scmd = qc->scsicmd;
1282 struct ata_taskfile *tf = &qc->tf;
1283 struct ata_device *dev = qc->dev;
1284 u64 dev_sectors = qc->dev->n_sectors;
1285 const u8 *cdb = scmd->cmnd;
1289 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1290 tf->protocol = ATA_PROT_NODATA;
1292 if (cdb[0] == VERIFY) {
1293 if (scmd->cmd_len < 10)
1295 scsi_10_lba_len(cdb, &block, &n_block);
1296 } else if (cdb[0] == VERIFY_16) {
1297 if (scmd->cmd_len < 16)
1299 scsi_16_lba_len(cdb, &block, &n_block);
1305 if (block >= dev_sectors)
1307 if ((block + n_block) > dev_sectors)
1310 if (dev->flags & ATA_DFLAG_LBA) {
1311 tf->flags |= ATA_TFLAG_LBA;
1313 if (lba_28_ok(block, n_block)) {
1315 tf->command = ATA_CMD_VERIFY;
1316 tf->device |= (block >> 24) & 0xf;
1317 } else if (lba_48_ok(block, n_block)) {
1318 if (!(dev->flags & ATA_DFLAG_LBA48))
1322 tf->flags |= ATA_TFLAG_LBA48;
1323 tf->command = ATA_CMD_VERIFY_EXT;
1325 tf->hob_nsect = (n_block >> 8) & 0xff;
1327 tf->hob_lbah = (block >> 40) & 0xff;
1328 tf->hob_lbam = (block >> 32) & 0xff;
1329 tf->hob_lbal = (block >> 24) & 0xff;
1331 /* request too large even for LBA48 */
1334 tf->nsect = n_block & 0xff;
1336 tf->lbah = (block >> 16) & 0xff;
1337 tf->lbam = (block >> 8) & 0xff;
1338 tf->lbal = block & 0xff;
1340 tf->device |= ATA_LBA;
1343 u32 sect, head, cyl, track;
1345 if (!lba_28_ok(block, n_block))
1348 /* Convert LBA to CHS */
1349 track = (u32)block / dev->sectors;
1350 cyl = track / dev->heads;
1351 head = track % dev->heads;
1352 sect = (u32)block % dev->sectors + 1;
1354 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1355 (u32)block, track, cyl, head, sect);
1357 /* Check whether the converted CHS can fit.
1361 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1364 tf->command = ATA_CMD_VERIFY;
1365 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1368 tf->lbah = cyl >> 8;
1375 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1376 /* "Invalid field in cbd" */
1380 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1381 /* "Logical Block Address out of range" */
1385 scmd->result = SAM_STAT_GOOD;
1390 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1391 * @qc: Storage for translated ATA taskfile
1393 * Converts any of six SCSI read/write commands into the
1394 * ATA counterpart, including starting sector (LBA),
1395 * sector count, and taking into account the device's LBA48
1398 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1399 * %WRITE_16 are currently supported.
1402 * spin_lock_irqsave(host lock)
1405 * Zero on success, non-zero on error.
1407 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1409 struct scsi_cmnd *scmd = qc->scsicmd;
1410 const u8 *cdb = scmd->cmnd;
1411 unsigned int tf_flags = 0;
1416 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1417 tf_flags |= ATA_TFLAG_WRITE;
1419 /* Calculate the SCSI LBA, transfer length and FUA. */
1423 if (unlikely(scmd->cmd_len < 10))
1425 scsi_10_lba_len(cdb, &block, &n_block);
1426 if (unlikely(cdb[1] & (1 << 3)))
1427 tf_flags |= ATA_TFLAG_FUA;
1431 if (unlikely(scmd->cmd_len < 6))
1433 scsi_6_lba_len(cdb, &block, &n_block);
1435 /* for 6-byte r/w commands, transfer length 0
1436 * means 256 blocks of data, not 0 block.
1443 if (unlikely(scmd->cmd_len < 16))
1445 scsi_16_lba_len(cdb, &block, &n_block);
1446 if (unlikely(cdb[1] & (1 << 3)))
1447 tf_flags |= ATA_TFLAG_FUA;
1450 DPRINTK("no-byte command\n");
1454 /* Check and compose ATA command */
1456 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1457 * length 0 means transfer 0 block of data.
1458 * However, for ATA R/W commands, sector count 0 means
1459 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1461 * WARNING: one or two older ATA drives treat 0 as 0...
1465 qc->flags |= ATA_QCFLAG_IO;
1466 qc->nbytes = n_block * ATA_SECT_SIZE;
1468 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1470 if (likely(rc == 0))
1475 /* treat all other errors as -EINVAL, fall through */
1477 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1478 /* "Invalid field in cbd" */
1482 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1483 /* "Logical Block Address out of range" */
1487 scmd->result = SAM_STAT_GOOD;
1491 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1493 struct ata_port *ap = qc->ap;
1494 struct scsi_cmnd *cmd = qc->scsicmd;
1495 u8 *cdb = cmd->cmnd;
1496 int need_sense = (qc->err_mask != 0);
1498 /* For ATA pass thru (SAT) commands, generate a sense block if
1499 * user mandated it or if there's an error. Note that if we
1500 * generate because the user forced us to, a check condition
1501 * is generated and the ATA register values are returned
1502 * whether the command completed successfully or not. If there
1503 * was no error, SK, ASC and ASCQ will all be zero.
1505 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1506 ((cdb[2] & 0x20) || need_sense)) {
1507 ata_gen_passthru_sense(qc);
1510 cmd->result = SAM_STAT_GOOD;
1512 /* TODO: decide which descriptor format to use
1513 * for 48b LBA devices and call that here
1514 * instead of the fixed desc, which is only
1515 * good for smaller LBA (and maybe CHS?)
1518 ata_gen_ata_sense(qc);
1522 /* XXX: track spindown state for spindown skipping and warning */
1523 if (unlikely(qc->tf.command == ATA_CMD_STANDBY ||
1524 qc->tf.command == ATA_CMD_STANDBYNOW1))
1525 qc->dev->flags |= ATA_DFLAG_SPUNDOWN;
1526 else if (likely(system_state != SYSTEM_HALT &&
1527 system_state != SYSTEM_POWER_OFF))
1528 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN;
1530 if (need_sense && !ap->ops->error_handler)
1531 ata_dump_status(ap->print_id, &qc->result_tf);
1539 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1540 * @dev: ATA device to which the command is addressed
1541 * @cmd: SCSI command to execute
1542 * @done: SCSI command completion function
1543 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1545 * Our ->queuecommand() function has decided that the SCSI
1546 * command issued can be directly translated into an ATA
1547 * command, rather than handled internally.
1549 * This function sets up an ata_queued_cmd structure for the
1550 * SCSI command, and sends that ata_queued_cmd to the hardware.
1552 * The xlat_func argument (actor) returns 0 if ready to execute
1553 * ATA command, else 1 to finish translation. If 1 is returned
1554 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1555 * to be set reflecting an error condition or clean (early)
1559 * spin_lock_irqsave(host lock)
1562 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1563 * needs to be deferred.
1565 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1566 void (*done)(struct scsi_cmnd *),
1567 ata_xlat_func_t xlat_func)
1569 struct ata_port *ap = dev->link->ap;
1570 struct ata_queued_cmd *qc;
1575 qc = ata_scsi_qc_new(dev, cmd, done);
1579 /* data is present; dma-map it */
1580 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1581 cmd->sc_data_direction == DMA_TO_DEVICE) {
1582 if (unlikely(scsi_bufflen(cmd) < 1)) {
1583 ata_dev_printk(dev, KERN_WARNING,
1584 "WARNING: zero len r/w req\n");
1588 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1590 qc->dma_dir = cmd->sc_data_direction;
1593 qc->complete_fn = ata_scsi_qc_complete;
1598 if (ap->ops->qc_defer) {
1599 if ((rc = ap->ops->qc_defer(qc)))
1603 /* select device, send command to hardware */
1612 DPRINTK("EXIT - early finish (good or error)\n");
1617 cmd->result = (DID_ERROR << 16);
1620 DPRINTK("EXIT - internal\n");
1625 DPRINTK("EXIT - defer\n");
1626 if (rc == ATA_DEFER_LINK)
1627 return SCSI_MLQUEUE_DEVICE_BUSY;
1629 return SCSI_MLQUEUE_HOST_BUSY;
1633 * ata_scsi_rbuf_get - Map response buffer.
1634 * @cmd: SCSI command containing buffer to be mapped.
1635 * @buf_out: Pointer to mapped area.
1637 * Maps buffer contained within SCSI command @cmd.
1640 * spin_lock_irqsave(host lock)
1643 * Length of response buffer.
1646 static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
1649 unsigned int buflen;
1651 struct scatterlist *sg = scsi_sglist(cmd);
1654 buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
1655 buflen = sg->length;
1666 * ata_scsi_rbuf_put - Unmap response buffer.
1667 * @cmd: SCSI command containing buffer to be unmapped.
1668 * @buf: buffer to unmap
1670 * Unmaps response buffer contained within @cmd.
1673 * spin_lock_irqsave(host lock)
1676 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
1678 struct scatterlist *sg = scsi_sglist(cmd);
1680 kunmap_atomic(buf - sg->offset, KM_IRQ0);
1684 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1685 * @args: device IDENTIFY data / SCSI command of interest.
1686 * @actor: Callback hook for desired SCSI command simulator
1688 * Takes care of the hard work of simulating a SCSI command...
1689 * Mapping the response buffer, calling the command's handler,
1690 * and handling the handler's return value. This return value
1691 * indicates whether the handler wishes the SCSI command to be
1692 * completed successfully (0), or not (in which case cmd->result
1693 * and sense buffer are assumed to be set).
1696 * spin_lock_irqsave(host lock)
1699 void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1700 unsigned int (*actor) (struct ata_scsi_args *args,
1701 u8 *rbuf, unsigned int buflen))
1704 unsigned int buflen, rc;
1705 struct scsi_cmnd *cmd = args->cmd;
1706 unsigned long flags;
1708 local_irq_save(flags);
1710 buflen = ata_scsi_rbuf_get(cmd, &rbuf);
1711 memset(rbuf, 0, buflen);
1712 rc = actor(args, rbuf, buflen);
1713 ata_scsi_rbuf_put(cmd, rbuf);
1715 local_irq_restore(flags);
1718 cmd->result = SAM_STAT_GOOD;
1723 * ATA_SCSI_RBUF_SET - helper to set values in SCSI response buffer
1724 * @idx: byte index into SCSI response buffer
1725 * @val: value to set
1727 * To be used by SCSI command simulator functions. This macros
1728 * expects two local variables, u8 *rbuf and unsigned int buflen,
1734 #define ATA_SCSI_RBUF_SET(idx, val) do { \
1735 if ((idx) < buflen) rbuf[(idx)] = (u8)(val); \
1739 * ata_scsiop_inq_std - Simulate INQUIRY command
1740 * @args: device IDENTIFY data / SCSI command of interest.
1741 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1742 * @buflen: Response buffer length.
1744 * Returns standard device identification data associated
1745 * with non-VPD INQUIRY command output.
1748 * spin_lock_irqsave(host lock)
1751 unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
1752 unsigned int buflen)
1757 0x5, /* claim SPC-3 version compatibility */
1762 /* set scsi removeable (RMB) bit per ata bit */
1763 if (ata_id_removeable(args->id))
1768 memcpy(rbuf, hdr, sizeof(hdr));
1771 memcpy(&rbuf[8], "ATA ", 8);
1772 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1773 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1774 if (rbuf[32] == 0 || rbuf[32] == ' ')
1775 memcpy(&rbuf[32], "n/a ", 4);
1779 const u8 versions[] = {
1780 0x60, /* SAM-3 (no version claimed) */
1783 0x20, /* SBC-2 (no version claimed) */
1786 0x60 /* SPC-3 (no version claimed) */
1789 memcpy(rbuf + 59, versions, sizeof(versions));
1796 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1797 * @args: device IDENTIFY data / SCSI command of interest.
1798 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1799 * @buflen: Response buffer length.
1801 * Returns list of inquiry VPD pages available.
1804 * spin_lock_irqsave(host lock)
1807 unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf,
1808 unsigned int buflen)
1810 const u8 pages[] = {
1811 0x00, /* page 0x00, this page */
1812 0x80, /* page 0x80, unit serial no page */
1813 0x83 /* page 0x83, device ident page */
1815 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1818 memcpy(rbuf + 4, pages, sizeof(pages));
1824 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1825 * @args: device IDENTIFY data / SCSI command of interest.
1826 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1827 * @buflen: Response buffer length.
1829 * Returns ATA device serial number.
1832 * spin_lock_irqsave(host lock)
1835 unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf,
1836 unsigned int buflen)
1840 0x80, /* this page code */
1842 ATA_ID_SERNO_LEN, /* page len */
1844 memcpy(rbuf, hdr, sizeof(hdr));
1846 if (buflen > (ATA_ID_SERNO_LEN + 4 - 1))
1847 ata_id_string(args->id, (unsigned char *) &rbuf[4],
1848 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1854 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1855 * @args: device IDENTIFY data / SCSI command of interest.
1856 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1857 * @buflen: Response buffer length.
1859 * Yields two logical unit device identification designators:
1860 * - vendor specific ASCII containing the ATA serial number
1861 * - SAT defined "t10 vendor id based" containing ASCII vendor
1862 * name ("ATA "), model and serial numbers.
1865 * spin_lock_irqsave(host lock)
1868 unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf,
1869 unsigned int buflen)
1872 const int sat_model_serial_desc_len = 68;
1874 rbuf[1] = 0x83; /* this page code */
1877 if (buflen > (ATA_ID_SERNO_LEN + num + 3)) {
1878 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
1880 rbuf[num + 3] = ATA_ID_SERNO_LEN;
1882 ata_id_string(args->id, (unsigned char *) rbuf + num,
1883 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1884 num += ATA_ID_SERNO_LEN;
1886 if (buflen > (sat_model_serial_desc_len + num + 3)) {
1887 /* SAT defined lu model and serial numbers descriptor */
1888 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
1891 rbuf[num + 3] = sat_model_serial_desc_len;
1893 memcpy(rbuf + num, "ATA ", 8);
1895 ata_id_string(args->id, (unsigned char *) rbuf + num,
1896 ATA_ID_PROD, ATA_ID_PROD_LEN);
1897 num += ATA_ID_PROD_LEN;
1898 ata_id_string(args->id, (unsigned char *) rbuf + num,
1899 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1900 num += ATA_ID_SERNO_LEN;
1902 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
1907 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
1908 * @args: device IDENTIFY data / SCSI command of interest.
1909 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1910 * @buflen: Response buffer length.
1912 * Yields SAT-specified ATA VPD page.
1915 * spin_lock_irqsave(host lock)
1918 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf,
1919 unsigned int buflen)
1922 struct ata_taskfile tf;
1928 memset(&pbuf, 0, sizeof(pbuf));
1929 memset(&tf, 0, sizeof(tf));
1931 pbuf[1] = 0x89; /* our page code */
1932 pbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
1933 pbuf[3] = (0x238 & 0xff);
1935 memcpy(&pbuf[8], "linux ", 8);
1936 memcpy(&pbuf[16], "libata ", 16);
1937 memcpy(&pbuf[32], DRV_VERSION, 4);
1938 ata_id_string(args->id, &pbuf[32], ATA_ID_FW_REV, 4);
1940 /* we don't store the ATA device signature, so we fake it */
1942 tf.command = ATA_DRDY; /* really, this is Status reg */
1946 ata_tf_to_fis(&tf, 0, 1, &pbuf[36]); /* TODO: PMP? */
1947 pbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
1949 pbuf[56] = ATA_CMD_ID_ATA;
1951 i = min(buflen, 60U);
1952 memcpy(rbuf, &pbuf[0], i);
1958 memcpy(&rbuf[60], &args->id[0], min(buflen, 512U));
1963 * ata_scsiop_noop - Command handler that simply returns success.
1964 * @args: device IDENTIFY data / SCSI command of interest.
1965 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1966 * @buflen: Response buffer length.
1968 * No operation. Simply returns success to caller, to indicate
1969 * that the caller should successfully complete this SCSI command.
1972 * spin_lock_irqsave(host lock)
1975 unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf,
1976 unsigned int buflen)
1983 * ata_msense_push - Push data onto MODE SENSE data output buffer
1984 * @ptr_io: (input/output) Location to store more output data
1985 * @last: End of output data buffer
1986 * @buf: Pointer to BLOB being added to output buffer
1987 * @buflen: Length of BLOB
1989 * Store MODE SENSE data on an output buffer.
1995 static void ata_msense_push(u8 **ptr_io, const u8 *last,
1996 const u8 *buf, unsigned int buflen)
2000 if ((ptr + buflen - 1) > last)
2003 memcpy(ptr, buf, buflen);
2011 * ata_msense_caching - Simulate MODE SENSE caching info page
2012 * @id: device IDENTIFY data
2013 * @ptr_io: (input/output) Location to store more output data
2014 * @last: End of output data buffer
2016 * Generate a caching info page, which conditionally indicates
2017 * write caching to the SCSI layer, depending on device
2024 static unsigned int ata_msense_caching(u16 *id, u8 **ptr_io,
2027 u8 page[CACHE_MPAGE_LEN];
2029 memcpy(page, def_cache_mpage, sizeof(page));
2030 if (ata_id_wcache_enabled(id))
2031 page[2] |= (1 << 2); /* write cache enable */
2032 if (!ata_id_rahead_enabled(id))
2033 page[12] |= (1 << 5); /* disable read ahead */
2035 ata_msense_push(ptr_io, last, page, sizeof(page));
2036 return sizeof(page);
2040 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2041 * @dev: Device associated with this MODE SENSE command
2042 * @ptr_io: (input/output) Location to store more output data
2043 * @last: End of output data buffer
2045 * Generate a generic MODE SENSE control mode page.
2051 static unsigned int ata_msense_ctl_mode(u8 **ptr_io, const u8 *last)
2053 ata_msense_push(ptr_io, last, def_control_mpage,
2054 sizeof(def_control_mpage));
2055 return sizeof(def_control_mpage);
2059 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2060 * @dev: Device associated with this MODE SENSE command
2061 * @ptr_io: (input/output) Location to store more output data
2062 * @last: End of output data buffer
2064 * Generate a generic MODE SENSE r/w error recovery page.
2070 static unsigned int ata_msense_rw_recovery(u8 **ptr_io, const u8 *last)
2073 ata_msense_push(ptr_io, last, def_rw_recovery_mpage,
2074 sizeof(def_rw_recovery_mpage));
2075 return sizeof(def_rw_recovery_mpage);
2079 * We can turn this into a real blacklist if it's needed, for now just
2080 * blacklist any Maxtor BANC1G10 revision firmware
2082 static int ata_dev_supports_fua(u16 *id)
2084 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2088 if (!ata_id_has_fua(id))
2091 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2092 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2094 if (strcmp(model, "Maxtor"))
2096 if (strcmp(fw, "BANC1G10"))
2099 return 0; /* blacklisted */
2103 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2104 * @args: device IDENTIFY data / SCSI command of interest.
2105 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2106 * @buflen: Response buffer length.
2108 * Simulate MODE SENSE commands. Assume this is invoked for direct
2109 * access devices (e.g. disks) only. There should be no block
2110 * descriptor for other device types.
2113 * spin_lock_irqsave(host lock)
2116 unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf,
2117 unsigned int buflen)
2119 struct ata_device *dev = args->dev;
2120 u8 *scsicmd = args->cmd->cmnd, *p, *last;
2121 const u8 sat_blk_desc[] = {
2122 0, 0, 0, 0, /* number of blocks: sat unspecified */
2124 0, 0x2, 0x0 /* block length: 512 bytes */
2127 unsigned int ebd, page_control, six_byte, output_len, alloc_len, minlen;
2132 six_byte = (scsicmd[0] == MODE_SENSE);
2133 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2135 * LLBA bit in msense(10) ignored (compliant)
2138 page_control = scsicmd[2] >> 6;
2139 switch (page_control) {
2140 case 0: /* current */
2141 break; /* supported */
2143 goto saving_not_supp;
2144 case 1: /* changeable */
2145 case 2: /* defaults */
2151 output_len = 4 + (ebd ? 8 : 0);
2152 alloc_len = scsicmd[4];
2154 output_len = 8 + (ebd ? 8 : 0);
2155 alloc_len = (scsicmd[7] << 8) + scsicmd[8];
2157 minlen = (alloc_len < buflen) ? alloc_len : buflen;
2159 p = rbuf + output_len;
2160 last = rbuf + minlen - 1;
2162 pg = scsicmd[2] & 0x3f;
2165 * No mode subpages supported (yet) but asking for _all_
2166 * subpages may be valid
2168 if (spg && (spg != ALL_SUB_MPAGES))
2172 case RW_RECOVERY_MPAGE:
2173 output_len += ata_msense_rw_recovery(&p, last);
2177 output_len += ata_msense_caching(args->id, &p, last);
2180 case CONTROL_MPAGE: {
2181 output_len += ata_msense_ctl_mode(&p, last);
2186 output_len += ata_msense_rw_recovery(&p, last);
2187 output_len += ata_msense_caching(args->id, &p, last);
2188 output_len += ata_msense_ctl_mode(&p, last);
2191 default: /* invalid page code */
2199 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2200 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2205 rbuf[0] = output_len;
2210 rbuf[3] = sizeof(sat_blk_desc);
2212 memcpy(rbuf + 4, sat_blk_desc,
2213 sizeof(sat_blk_desc));
2217 rbuf[0] = output_len >> 8;
2219 rbuf[1] = output_len;
2224 rbuf[7] = sizeof(sat_blk_desc);
2226 memcpy(rbuf + 8, sat_blk_desc,
2227 sizeof(sat_blk_desc));
2233 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2234 /* "Invalid field in cbd" */
2238 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2239 /* "Saving parameters not supported" */
2244 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2245 * @args: device IDENTIFY data / SCSI command of interest.
2246 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2247 * @buflen: Response buffer length.
2249 * Simulate READ CAPACITY commands.
2254 unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf,
2255 unsigned int buflen)
2257 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
2261 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2262 if (last_lba >= 0xffffffffULL)
2263 last_lba = 0xffffffff;
2265 /* sector count, 32-bit */
2266 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 3));
2267 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 2));
2268 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 1));
2269 ATA_SCSI_RBUF_SET(3, last_lba);
2272 ATA_SCSI_RBUF_SET(6, ATA_SECT_SIZE >> 8);
2273 ATA_SCSI_RBUF_SET(7, ATA_SECT_SIZE & 0xff);
2275 /* sector count, 64-bit */
2276 ATA_SCSI_RBUF_SET(0, last_lba >> (8 * 7));
2277 ATA_SCSI_RBUF_SET(1, last_lba >> (8 * 6));
2278 ATA_SCSI_RBUF_SET(2, last_lba >> (8 * 5));
2279 ATA_SCSI_RBUF_SET(3, last_lba >> (8 * 4));
2280 ATA_SCSI_RBUF_SET(4, last_lba >> (8 * 3));
2281 ATA_SCSI_RBUF_SET(5, last_lba >> (8 * 2));
2282 ATA_SCSI_RBUF_SET(6, last_lba >> (8 * 1));
2283 ATA_SCSI_RBUF_SET(7, last_lba);
2286 ATA_SCSI_RBUF_SET(10, ATA_SECT_SIZE >> 8);
2287 ATA_SCSI_RBUF_SET(11, ATA_SECT_SIZE & 0xff);
2294 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2295 * @args: device IDENTIFY data / SCSI command of interest.
2296 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2297 * @buflen: Response buffer length.
2299 * Simulate REPORT LUNS command.
2302 * spin_lock_irqsave(host lock)
2305 unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf,
2306 unsigned int buflen)
2309 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2315 * ata_scsi_set_sense - Set SCSI sense data and status
2316 * @cmd: SCSI request to be handled
2317 * @sk: SCSI-defined sense key
2318 * @asc: SCSI-defined additional sense code
2319 * @ascq: SCSI-defined additional sense code qualifier
2321 * Helper function that builds a valid fixed format, current
2322 * response code and the given sense key (sk), additional sense
2323 * code (asc) and additional sense code qualifier (ascq) with
2324 * a SCSI command status of %SAM_STAT_CHECK_CONDITION and
2325 * DRIVER_SENSE set in the upper bits of scsi_cmnd::result .
2331 void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
2333 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
2335 cmd->sense_buffer[0] = 0x70; /* fixed format, current */
2336 cmd->sense_buffer[2] = sk;
2337 cmd->sense_buffer[7] = 18 - 8; /* additional sense length */
2338 cmd->sense_buffer[12] = asc;
2339 cmd->sense_buffer[13] = ascq;
2343 * ata_scsi_badcmd - End a SCSI request with an error
2344 * @cmd: SCSI request to be handled
2345 * @done: SCSI command completion function
2346 * @asc: SCSI-defined additional sense code
2347 * @ascq: SCSI-defined additional sense code qualifier
2349 * Helper function that completes a SCSI command with
2350 * %SAM_STAT_CHECK_CONDITION, with a sense key %ILLEGAL_REQUEST
2351 * and the specified additional sense codes.
2354 * spin_lock_irqsave(host lock)
2357 void ata_scsi_badcmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *), u8 asc, u8 ascq)
2360 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, asc, ascq);
2365 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2367 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2368 /* FIXME: not quite right; we don't want the
2369 * translation of taskfile registers into
2370 * a sense descriptors, since that's only
2371 * correct for ATA, not ATAPI
2373 ata_gen_passthru_sense(qc);
2376 qc->scsidone(qc->scsicmd);
2380 /* is it pointless to prefer PIO for "safety reasons"? */
2381 static inline int ata_pio_use_silly(struct ata_port *ap)
2383 return (ap->flags & ATA_FLAG_PIO_DMA);
2386 static void atapi_request_sense(struct ata_queued_cmd *qc)
2388 struct ata_port *ap = qc->ap;
2389 struct scsi_cmnd *cmd = qc->scsicmd;
2391 DPRINTK("ATAPI request sense\n");
2393 /* FIXME: is this needed? */
2394 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2396 ap->ops->tf_read(ap, &qc->tf);
2398 /* fill these in, for the case where they are -not- overwritten */
2399 cmd->sense_buffer[0] = 0x70;
2400 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2404 /* setup sg table and init transfer direction */
2405 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2406 ata_sg_init(qc, &qc->sgent, 1);
2407 qc->dma_dir = DMA_FROM_DEVICE;
2409 memset(&qc->cdb, 0, qc->dev->cdb_len);
2410 qc->cdb[0] = REQUEST_SENSE;
2411 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2413 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2414 qc->tf.command = ATA_CMD_PACKET;
2416 if (ata_pio_use_silly(ap)) {
2417 qc->tf.protocol = ATAPI_PROT_DMA;
2418 qc->tf.feature |= ATAPI_PKT_DMA;
2420 qc->tf.protocol = ATAPI_PROT_PIO;
2421 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2424 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2426 qc->complete_fn = atapi_sense_complete;
2433 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2435 struct scsi_cmnd *cmd = qc->scsicmd;
2436 unsigned int err_mask = qc->err_mask;
2438 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2440 /* handle completion from new EH */
2441 if (unlikely(qc->ap->ops->error_handler &&
2442 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2444 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2445 /* FIXME: not quite right; we don't want the
2446 * translation of taskfile registers into a
2447 * sense descriptors, since that's only
2448 * correct for ATA, not ATAPI
2450 ata_gen_passthru_sense(qc);
2453 /* SCSI EH automatically locks door if sdev->locked is
2454 * set. Sometimes door lock request continues to
2455 * fail, for example, when no media is present. This
2456 * creates a loop - SCSI EH issues door lock which
2457 * fails and gets invoked again to acquire sense data
2458 * for the failed command.
2460 * If door lock fails, always clear sdev->locked to
2461 * avoid this infinite loop.
2463 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2464 qc->dev->sdev->locked = 0;
2466 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2472 /* successful completion or old EH failure path */
2473 if (unlikely(err_mask & AC_ERR_DEV)) {
2474 cmd->result = SAM_STAT_CHECK_CONDITION;
2475 atapi_request_sense(qc);
2477 } else if (unlikely(err_mask)) {
2478 /* FIXME: not quite right; we don't want the
2479 * translation of taskfile registers into
2480 * a sense descriptors, since that's only
2481 * correct for ATA, not ATAPI
2483 ata_gen_passthru_sense(qc);
2485 u8 *scsicmd = cmd->cmnd;
2487 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2489 unsigned int buflen;
2490 unsigned long flags;
2492 local_irq_save(flags);
2494 buflen = ata_scsi_rbuf_get(cmd, &buf);
2496 /* ATAPI devices typically report zero for their SCSI version,
2497 * and sometimes deviate from the spec WRT response data
2498 * format. If SCSI version is reported as zero like normal,
2499 * then we make the following fixups: 1) Fake MMC-5 version,
2500 * to indicate to the Linux scsi midlayer this is a modern
2501 * device. 2) Ensure response data format / ATAPI information
2502 * are always correct.
2509 ata_scsi_rbuf_put(cmd, buf);
2511 local_irq_restore(flags);
2514 cmd->result = SAM_STAT_GOOD;
2521 * atapi_xlat - Initialize PACKET taskfile
2522 * @qc: command structure to be initialized
2525 * spin_lock_irqsave(host lock)
2528 * Zero on success, non-zero on failure.
2530 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2532 struct scsi_cmnd *scmd = qc->scsicmd;
2533 struct ata_device *dev = qc->dev;
2534 int using_pio = (dev->flags & ATA_DFLAG_PIO);
2535 int nodata = (scmd->sc_data_direction == DMA_NONE);
2536 unsigned int nbytes;
2538 memset(qc->cdb, 0, dev->cdb_len);
2539 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2541 qc->complete_fn = atapi_qc_complete;
2543 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2544 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2545 qc->tf.flags |= ATA_TFLAG_WRITE;
2546 DPRINTK("direction: write\n");
2549 qc->tf.command = ATA_CMD_PACKET;
2550 ata_qc_set_pc_nbytes(qc);
2552 /* check whether ATAPI DMA is safe */
2553 if (!using_pio && ata_check_atapi_dma(qc))
2556 /* Some controller variants snoop this value for Packet
2557 * transfers to do state machine and FIFO management. Thus we
2558 * want to set it properly, and for DMA where it is
2559 * effectively meaningless.
2561 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2563 /* Most ATAPI devices which honor transfer chunk size don't
2564 * behave according to the spec when odd chunk size which
2565 * matches the transfer length is specified. If the number of
2566 * bytes to transfer is 2n+1. According to the spec, what
2567 * should happen is to indicate that 2n+1 is going to be
2568 * transferred and transfer 2n+2 bytes where the last byte is
2571 * In practice, this doesn't happen. ATAPI devices first
2572 * indicate and transfer 2n bytes and then indicate and
2573 * transfer 2 bytes where the last byte is padding.
2575 * This inconsistency confuses several controllers which
2576 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2577 * These controllers use actual number of transferred bytes to
2578 * update DMA poitner and transfer of 4n+2 bytes make those
2579 * controller push DMA pointer by 4n+4 bytes because SATA data
2580 * FISes are aligned to 4 bytes. This causes data corruption
2581 * and buffer overrun.
2583 * Always setting nbytes to even number solves this problem
2584 * because then ATAPI devices don't have to split data at 2n
2590 qc->tf.lbam = (nbytes & 0xFF);
2591 qc->tf.lbah = (nbytes >> 8);
2593 if (using_pio || nodata) {
2594 /* no data, or PIO data xfer */
2596 qc->tf.protocol = ATAPI_PROT_NODATA;
2598 qc->tf.protocol = ATAPI_PROT_PIO;
2601 qc->tf.protocol = ATAPI_PROT_DMA;
2602 qc->tf.feature |= ATAPI_PKT_DMA;
2604 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2605 (scmd->sc_data_direction != DMA_TO_DEVICE))
2606 /* some SATA bridges need us to indicate data xfer direction */
2607 qc->tf.feature |= ATAPI_DMADIR;
2611 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2612 as ATAPI tape drives don't get this right otherwise */
2616 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2618 if (ap->nr_pmp_links == 0) {
2619 if (likely(devno < ata_link_max_devices(&ap->link)))
2620 return &ap->link.device[devno];
2622 if (likely(devno < ap->nr_pmp_links))
2623 return &ap->pmp_link[devno].device[0];
2629 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2630 const struct scsi_device *scsidev)
2634 /* skip commands not addressed to targets we simulate */
2635 if (ap->nr_pmp_links == 0) {
2636 if (unlikely(scsidev->channel || scsidev->lun))
2638 devno = scsidev->id;
2640 if (unlikely(scsidev->id || scsidev->lun))
2642 devno = scsidev->channel;
2645 return ata_find_dev(ap, devno);
2649 * ata_scsi_dev_enabled - determine if device is enabled
2652 * Determine if commands should be sent to the specified device.
2655 * spin_lock_irqsave(host lock)
2658 * 0 if commands are not allowed / 1 if commands are allowed
2661 static int ata_scsi_dev_enabled(struct ata_device *dev)
2663 if (unlikely(!ata_dev_enabled(dev)))
2666 if (!atapi_enabled || (dev->link->ap->flags & ATA_FLAG_NO_ATAPI)) {
2667 if (unlikely(dev->class == ATA_DEV_ATAPI)) {
2668 ata_dev_printk(dev, KERN_WARNING,
2669 "WARNING: ATAPI is %s, device ignored.\n",
2670 atapi_enabled ? "not supported with this driver" : "disabled");
2679 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2680 * @ap: ATA port to which the device is attached
2681 * @scsidev: SCSI device from which we derive the ATA device
2683 * Given various information provided in struct scsi_cmnd,
2684 * map that onto an ATA bus, and using that mapping
2685 * determine which ata_device is associated with the
2686 * SCSI command to be sent.
2689 * spin_lock_irqsave(host lock)
2692 * Associated ATA device, or %NULL if not found.
2694 static struct ata_device *
2695 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2697 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2699 if (unlikely(!dev || !ata_scsi_dev_enabled(dev)))
2706 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2707 * @byte1: Byte 1 from pass-thru CDB.
2710 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2713 ata_scsi_map_proto(u8 byte1)
2715 switch((byte1 & 0x1e) >> 1) {
2716 case 3: /* Non-data */
2717 return ATA_PROT_NODATA;
2720 case 10: /* UDMA Data-in */
2721 case 11: /* UDMA Data-Out */
2722 return ATA_PROT_DMA;
2724 case 4: /* PIO Data-in */
2725 case 5: /* PIO Data-out */
2726 return ATA_PROT_PIO;
2728 case 0: /* Hard Reset */
2730 case 8: /* Device Diagnostic */
2731 case 9: /* Device Reset */
2732 case 7: /* DMA Queued */
2733 case 12: /* FPDMA */
2734 case 15: /* Return Response Info */
2735 default: /* Reserved */
2739 return ATA_PROT_UNKNOWN;
2743 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2744 * @qc: command structure to be initialized
2746 * Handles either 12 or 16-byte versions of the CDB.
2749 * Zero on success, non-zero on failure.
2751 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2753 struct ata_taskfile *tf = &(qc->tf);
2754 struct scsi_cmnd *scmd = qc->scsicmd;
2755 struct ata_device *dev = qc->dev;
2756 const u8 *cdb = scmd->cmnd;
2758 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2762 * Filter TPM commands by default. These provide an
2763 * essentially uncontrolled encrypted "back door" between
2764 * applications and the disk. Set libata.allow_tpm=1 if you
2765 * have a real reason for wanting to use them. This ensures
2766 * that installed software cannot easily mess stuff up without
2767 * user intent. DVR type users will probably ship with this enabled
2768 * for movie content management.
2770 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
2771 * for this and should do in future but that it is not sufficient as
2772 * DCS is an optional feature set. Thus we also do the software filter
2773 * so that we comply with the TC consortium stated goal that the user
2774 * can turn off TC features of their system.
2776 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
2779 /* We may not issue DMA commands if no DMA mode is set */
2780 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2784 * 12 and 16 byte CDBs use different offsets to
2785 * provide the various register values.
2787 if (cdb[0] == ATA_16) {
2789 * 16-byte CDB - may contain extended commands.
2791 * If that is the case, copy the upper byte register values.
2793 if (cdb[1] & 0x01) {
2794 tf->hob_feature = cdb[3];
2795 tf->hob_nsect = cdb[5];
2796 tf->hob_lbal = cdb[7];
2797 tf->hob_lbam = cdb[9];
2798 tf->hob_lbah = cdb[11];
2799 tf->flags |= ATA_TFLAG_LBA48;
2801 tf->flags &= ~ATA_TFLAG_LBA48;
2804 * Always copy low byte, device and command registers.
2806 tf->feature = cdb[4];
2811 tf->device = cdb[13];
2812 tf->command = cdb[14];
2815 * 12-byte CDB - incapable of extended commands.
2817 tf->flags &= ~ATA_TFLAG_LBA48;
2819 tf->feature = cdb[3];
2824 tf->device = cdb[8];
2825 tf->command = cdb[9];
2828 /* enforce correct master/slave bit */
2829 tf->device = dev->devno ?
2830 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2832 /* sanity check for pio multi commands */
2833 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2836 if (is_multi_taskfile(tf)) {
2837 unsigned int multi_count = 1 << (cdb[1] >> 5);
2839 /* compare the passed through multi_count
2840 * with the cached multi_count of libata
2842 if (multi_count != dev->multi_count)
2843 ata_dev_printk(dev, KERN_WARNING,
2844 "invalid multi_count %u ignored\n",
2848 /* READ/WRITE LONG use a non-standard sect_size */
2849 qc->sect_size = ATA_SECT_SIZE;
2850 switch (tf->command) {
2851 case ATA_CMD_READ_LONG:
2852 case ATA_CMD_READ_LONG_ONCE:
2853 case ATA_CMD_WRITE_LONG:
2854 case ATA_CMD_WRITE_LONG_ONCE:
2855 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2857 qc->sect_size = scsi_bufflen(scmd);
2861 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2862 * SET_FEATURES - XFER MODE must be preceded/succeeded
2863 * by an update to hardware-specific registers for each
2864 * controller (i.e. the reason for ->set_piomode(),
2865 * ->set_dmamode(), and ->post_set_mode() hooks).
2867 if ((tf->command == ATA_CMD_SET_FEATURES)
2868 && (tf->feature == SETFEATURES_XFER))
2872 * Set flags so that all registers will be written,
2873 * and pass on write indication (used for PIO/DMA
2876 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2878 if (scmd->sc_data_direction == DMA_TO_DEVICE)
2879 tf->flags |= ATA_TFLAG_WRITE;
2882 * Set transfer length.
2884 * TODO: find out if we need to do more here to
2885 * cover scatter/gather case.
2887 ata_qc_set_pc_nbytes(qc);
2889 /* request result TF and be quiet about device error */
2890 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
2895 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
2896 /* "Invalid field in cdb" */
2901 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2903 * @cmd: SCSI command opcode to consider
2905 * Look up the SCSI command given, and determine whether the
2906 * SCSI command is to be translated or simulated.
2909 * Pointer to translation function if possible, %NULL if not.
2912 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2922 return ata_scsi_rw_xlat;
2924 case SYNCHRONIZE_CACHE:
2925 if (ata_try_flush_cache(dev))
2926 return ata_scsi_flush_xlat;
2931 return ata_scsi_verify_xlat;
2935 return ata_scsi_pass_thru;
2938 return ata_scsi_start_stop_xlat;
2945 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2946 * @ap: ATA port to which the command was being sent
2947 * @cmd: SCSI command to dump
2949 * Prints the contents of a SCSI command via printk().
2952 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2953 struct scsi_cmnd *cmd)
2956 struct scsi_device *scsidev = cmd->device;
2957 u8 *scsicmd = cmd->cmnd;
2959 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2961 scsidev->channel, scsidev->id, scsidev->lun,
2962 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2963 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2968 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2969 void (*done)(struct scsi_cmnd *),
2970 struct ata_device *dev)
2972 u8 scsi_op = scmd->cmnd[0];
2973 ata_xlat_func_t xlat_func;
2976 if (dev->class == ATA_DEV_ATA) {
2977 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
2980 xlat_func = ata_get_xlat_func(dev, scsi_op);
2982 if (unlikely(!scmd->cmd_len))
2986 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
2987 /* relay SCSI command to ATAPI device */
2988 int len = COMMAND_SIZE(scsi_op);
2989 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
2992 xlat_func = atapi_xlat;
2994 /* ATA_16 passthru, treat as an ATA command */
2995 if (unlikely(scmd->cmd_len > 16))
2998 xlat_func = ata_get_xlat_func(dev, scsi_op);
3003 rc = ata_scsi_translate(dev, scmd, done, xlat_func);
3005 ata_scsi_simulate(dev, scmd, done);
3010 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3011 scmd->cmd_len, scsi_op, dev->cdb_len);
3012 scmd->result = DID_ERROR << 16;
3018 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3019 * @cmd: SCSI command to be sent
3020 * @done: Completion function, called when command is complete
3022 * In some cases, this function translates SCSI commands into
3023 * ATA taskfiles, and queues the taskfiles to be sent to
3024 * hardware. In other cases, this function simulates a
3025 * SCSI device by evaluating and responding to certain
3026 * SCSI commands. This creates the overall effect of
3027 * ATA and ATAPI devices appearing as SCSI devices.
3030 * Releases scsi-layer-held lock, and obtains host lock.
3033 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3036 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
3038 struct ata_port *ap;
3039 struct ata_device *dev;
3040 struct scsi_device *scsidev = cmd->device;
3041 struct Scsi_Host *shost = scsidev->host;
3044 ap = ata_shost_to_port(shost);
3046 spin_unlock(shost->host_lock);
3047 spin_lock(ap->lock);
3049 ata_scsi_dump_cdb(ap, cmd);
3051 dev = ata_scsi_find_dev(ap, scsidev);
3053 rc = __ata_scsi_queuecmd(cmd, done, dev);
3055 cmd->result = (DID_BAD_TARGET << 16);
3059 spin_unlock(ap->lock);
3060 spin_lock(shost->host_lock);
3065 * ata_scsi_simulate - simulate SCSI command on ATA device
3066 * @dev: the target device
3067 * @cmd: SCSI command being sent to device.
3068 * @done: SCSI command completion function.
3070 * Interprets and directly executes a select list of SCSI commands
3071 * that can be handled internally.
3074 * spin_lock_irqsave(host lock)
3077 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
3078 void (*done)(struct scsi_cmnd *))
3080 struct ata_scsi_args args;
3081 const u8 *scsicmd = cmd->cmnd;
3089 switch(scsicmd[0]) {
3090 /* TODO: worth improving? */
3092 ata_scsi_invalid_field(cmd, done);
3096 if (scsicmd[1] & 2) /* is CmdDt set? */
3097 ata_scsi_invalid_field(cmd, done);
3098 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3099 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3100 else switch (scsicmd[2]) {
3102 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3105 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3108 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3111 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3114 ata_scsi_invalid_field(cmd, done);
3121 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3124 case MODE_SELECT: /* unconditionally return */
3125 case MODE_SELECT_10: /* bad-field-in-cdb */
3126 ata_scsi_invalid_field(cmd, done);
3130 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3133 case SERVICE_ACTION_IN:
3134 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3135 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3137 ata_scsi_invalid_field(cmd, done);
3141 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3145 ata_scsi_set_sense(cmd, 0, 0, 0);
3146 cmd->result = (DRIVER_SENSE << 24);
3150 /* if we reach this, then writeback caching is disabled,
3151 * turning this into a no-op.
3153 case SYNCHRONIZE_CACHE:
3156 /* no-op's, complete with success */
3160 case TEST_UNIT_READY:
3161 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3164 case SEND_DIAGNOSTIC:
3165 tmp8 = scsicmd[1] & ~(1 << 3);
3166 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3167 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3169 ata_scsi_invalid_field(cmd, done);
3172 /* all other commands */
3174 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3175 /* "Invalid command operation code" */
3181 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3185 for (i = 0; i < host->n_ports; i++) {
3186 struct ata_port *ap = host->ports[i];
3187 struct Scsi_Host *shost;
3190 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3194 *(struct ata_port **)&shost->hostdata[0] = ap;
3195 ap->scsi_host = shost;
3197 shost->transportt = &ata_scsi_transport_template;
3198 shost->unique_id = ap->print_id;
3201 shost->max_channel = 1;
3202 shost->max_cmd_len = 16;
3204 /* Schedule policy is determined by ->qc_defer()
3205 * callback and it needs to see every deferred qc.
3206 * Set host_blocked to 1 to prevent SCSI midlayer from
3207 * automatically deferring requests.
3209 shost->max_host_blocked = 1;
3211 rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3219 scsi_host_put(host->ports[i]->scsi_host);
3222 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3224 scsi_remove_host(shost);
3225 scsi_host_put(shost);
3230 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3233 struct ata_device *last_failed_dev = NULL;
3234 struct ata_link *link;
3235 struct ata_device *dev;
3237 if (ap->flags & ATA_FLAG_DISABLED)
3241 ata_port_for_each_link(link, ap) {
3242 ata_link_for_each_dev(dev, link) {
3243 struct scsi_device *sdev;
3244 int channel = 0, id = 0;
3246 if (!ata_dev_enabled(dev) || dev->sdev)
3249 if (ata_is_host_link(link))
3252 channel = link->pmp;
3254 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3256 if (!IS_ERR(sdev)) {
3258 scsi_device_put(sdev);
3263 /* If we scanned while EH was in progress or allocation
3264 * failure occurred, scan would have failed silently. Check
3265 * whether all devices are attached.
3267 ata_port_for_each_link(link, ap) {
3268 ata_link_for_each_dev(dev, link) {
3269 if (ata_dev_enabled(dev) && !dev->sdev)
3277 /* we're missing some SCSI devices */
3279 /* If caller requested synchrnous scan && we've made
3280 * any progress, sleep briefly and repeat.
3282 if (dev != last_failed_dev) {
3284 last_failed_dev = dev;
3288 /* We might be failing to detect boot device, give it
3289 * a few more chances.
3296 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3297 "failed without making any progress,\n"
3298 " switching to async\n");
3301 queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3302 round_jiffies_relative(HZ));
3306 * ata_scsi_offline_dev - offline attached SCSI device
3307 * @dev: ATA device to offline attached SCSI device for
3309 * This function is called from ata_eh_hotplug() and responsible
3310 * for taking the SCSI device attached to @dev offline. This
3311 * function is called with host lock which protects dev->sdev
3315 * spin_lock_irqsave(host lock)
3318 * 1 if attached SCSI device exists, 0 otherwise.
3320 int ata_scsi_offline_dev(struct ata_device *dev)
3323 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3330 * ata_scsi_remove_dev - remove attached SCSI device
3331 * @dev: ATA device to remove attached SCSI device for
3333 * This function is called from ata_eh_scsi_hotplug() and
3334 * responsible for removing the SCSI device attached to @dev.
3337 * Kernel thread context (may sleep).
3339 static void ata_scsi_remove_dev(struct ata_device *dev)
3341 struct ata_port *ap = dev->link->ap;
3342 struct scsi_device *sdev;
3343 unsigned long flags;
3345 /* Alas, we need to grab scan_mutex to ensure SCSI device
3346 * state doesn't change underneath us and thus
3347 * scsi_device_get() always succeeds. The mutex locking can
3348 * be removed if there is __scsi_device_get() interface which
3349 * increments reference counts regardless of device state.
3351 mutex_lock(&ap->scsi_host->scan_mutex);
3352 spin_lock_irqsave(ap->lock, flags);
3354 /* clearing dev->sdev is protected by host lock */
3359 /* If user initiated unplug races with us, sdev can go
3360 * away underneath us after the host lock and
3361 * scan_mutex are released. Hold onto it.
3363 if (scsi_device_get(sdev) == 0) {
3364 /* The following ensures the attached sdev is
3365 * offline on return from ata_scsi_offline_dev()
3366 * regardless it wins or loses the race
3367 * against this function.
3369 scsi_device_set_state(sdev, SDEV_OFFLINE);
3376 spin_unlock_irqrestore(ap->lock, flags);
3377 mutex_unlock(&ap->scsi_host->scan_mutex);
3380 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3381 sdev->sdev_gendev.bus_id);
3383 scsi_remove_device(sdev);
3384 scsi_device_put(sdev);
3388 static void ata_scsi_handle_link_detach(struct ata_link *link)
3390 struct ata_port *ap = link->ap;
3391 struct ata_device *dev;
3393 ata_link_for_each_dev(dev, link) {
3394 unsigned long flags;
3396 if (!(dev->flags & ATA_DFLAG_DETACHED))
3399 spin_lock_irqsave(ap->lock, flags);
3400 dev->flags &= ~ATA_DFLAG_DETACHED;
3401 spin_unlock_irqrestore(ap->lock, flags);
3403 ata_scsi_remove_dev(dev);
3408 * ata_scsi_media_change_notify - send media change event
3409 * @dev: Pointer to the disk device with media change event
3411 * Tell the block layer to send a media change notification
3415 * spin_lock_irqsave(host lock)
3417 void ata_scsi_media_change_notify(struct ata_device *dev)
3420 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3425 * ata_scsi_hotplug - SCSI part of hotplug
3426 * @work: Pointer to ATA port to perform SCSI hotplug on
3428 * Perform SCSI part of hotplug. It's executed from a separate
3429 * workqueue after EH completes. This is necessary because SCSI
3430 * hot plugging requires working EH and hot unplugging is
3431 * synchronized with hot plugging with a mutex.
3434 * Kernel thread context (may sleep).
3436 void ata_scsi_hotplug(struct work_struct *work)
3438 struct ata_port *ap =
3439 container_of(work, struct ata_port, hotplug_task.work);
3442 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3443 DPRINTK("ENTER/EXIT - unloading\n");
3449 /* Unplug detached devices. We cannot use link iterator here
3450 * because PMP links have to be scanned even if PMP is
3451 * currently not attached. Iterate manually.
3453 ata_scsi_handle_link_detach(&ap->link);
3455 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3456 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3458 /* scan for new ones */
3459 ata_scsi_scan_host(ap, 0);
3465 * ata_scsi_user_scan - indication for user-initiated bus scan
3466 * @shost: SCSI host to scan
3467 * @channel: Channel to scan
3471 * This function is called when user explicitly requests bus
3472 * scan. Set probe pending flag and invoke EH.
3475 * SCSI layer (we don't care)
3480 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3481 unsigned int id, unsigned int lun)
3483 struct ata_port *ap = ata_shost_to_port(shost);
3484 unsigned long flags;
3487 if (!ap->ops->error_handler)
3490 if (lun != SCAN_WILD_CARD && lun)
3493 if (ap->nr_pmp_links == 0) {
3494 if (channel != SCAN_WILD_CARD && channel)
3498 if (id != SCAN_WILD_CARD && id)
3503 spin_lock_irqsave(ap->lock, flags);
3505 if (devno == SCAN_WILD_CARD) {
3506 struct ata_link *link;
3508 ata_port_for_each_link(link, ap) {
3509 struct ata_eh_info *ehi = &link->eh_info;
3510 ehi->probe_mask |= (1 << ata_link_max_devices(link)) - 1;
3511 ehi->action |= ATA_EH_SOFTRESET;
3514 struct ata_device *dev = ata_find_dev(ap, devno);
3517 struct ata_eh_info *ehi = &dev->link->eh_info;
3518 ehi->probe_mask |= 1 << dev->devno;
3519 ehi->action |= ATA_EH_SOFTRESET;
3520 ehi->flags |= ATA_EHI_RESUME_LINK;
3526 ata_port_schedule_eh(ap);
3527 spin_unlock_irqrestore(ap->lock, flags);
3528 ata_port_wait_eh(ap);
3530 spin_unlock_irqrestore(ap->lock, flags);
3536 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3537 * @work: Pointer to ATA port to perform scsi_rescan_device()
3539 * After ATA pass thru (SAT) commands are executed successfully,
3540 * libata need to propagate the changes to SCSI layer. This
3541 * function must be executed from ata_aux_wq such that sdev
3542 * attach/detach don't race with rescan.
3545 * Kernel thread context (may sleep).
3547 void ata_scsi_dev_rescan(struct work_struct *work)
3549 struct ata_port *ap =
3550 container_of(work, struct ata_port, scsi_rescan_task);
3551 struct ata_link *link;
3552 struct ata_device *dev;
3553 unsigned long flags;
3555 spin_lock_irqsave(ap->lock, flags);
3557 ata_port_for_each_link(link, ap) {
3558 ata_link_for_each_dev(dev, link) {
3559 struct scsi_device *sdev = dev->sdev;
3561 if (!ata_dev_enabled(dev) || !sdev)
3563 if (scsi_device_get(sdev))
3566 spin_unlock_irqrestore(ap->lock, flags);
3567 scsi_rescan_device(&(sdev->sdev_gendev));
3568 scsi_device_put(sdev);
3569 spin_lock_irqsave(ap->lock, flags);
3573 spin_unlock_irqrestore(ap->lock, flags);
3577 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3578 * @host: ATA host container for all SAS ports
3579 * @port_info: Information from low-level host driver
3580 * @shost: SCSI host that the scsi device is attached to
3583 * PCI/etc. bus probe sem.
3586 * ata_port pointer on success / NULL on failure.
3589 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3590 struct ata_port_info *port_info,
3591 struct Scsi_Host *shost)
3593 struct ata_port *ap;
3595 ap = ata_port_alloc(host);
3600 ap->lock = shost->host_lock;
3601 ap->pio_mask = port_info->pio_mask;
3602 ap->mwdma_mask = port_info->mwdma_mask;
3603 ap->udma_mask = port_info->udma_mask;
3604 ap->flags |= port_info->flags;
3605 ap->ops = port_info->port_ops;
3606 ap->cbl = ATA_CBL_SATA;
3610 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3613 * ata_sas_port_start - Set port up for dma.
3614 * @ap: Port to initialize
3616 * Called just after data structures for each port are
3619 * May be used as the port_start() entry in ata_port_operations.
3622 * Inherited from caller.
3624 int ata_sas_port_start(struct ata_port *ap)
3628 EXPORT_SYMBOL_GPL(ata_sas_port_start);
3631 * ata_port_stop - Undo ata_sas_port_start()
3632 * @ap: Port to shut down
3634 * May be used as the port_stop() entry in ata_port_operations.
3637 * Inherited from caller.
3640 void ata_sas_port_stop(struct ata_port *ap)
3643 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3646 * ata_sas_port_init - Initialize a SATA device
3647 * @ap: SATA port to initialize
3650 * PCI/etc. bus probe sem.
3653 * Zero on success, non-zero on error.
3656 int ata_sas_port_init(struct ata_port *ap)
3658 int rc = ap->ops->port_start(ap);
3661 ap->print_id = ata_print_id++;
3662 rc = ata_bus_probe(ap);
3667 EXPORT_SYMBOL_GPL(ata_sas_port_init);
3670 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3671 * @ap: SATA port to destroy
3675 void ata_sas_port_destroy(struct ata_port *ap)
3677 if (ap->ops->port_stop)
3678 ap->ops->port_stop(ap);
3681 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3684 * ata_sas_slave_configure - Default slave_config routine for libata devices
3685 * @sdev: SCSI device to configure
3686 * @ap: ATA port to which SCSI device is attached
3692 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3694 ata_scsi_sdev_config(sdev);
3695 ata_scsi_dev_config(sdev, ap->link.device);
3698 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3701 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3702 * @cmd: SCSI command to be sent
3703 * @done: Completion function, called when command is complete
3704 * @ap: ATA port to which the command is being sent
3707 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3711 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3712 struct ata_port *ap)
3716 ata_scsi_dump_cdb(ap, cmd);
3718 if (likely(ata_scsi_dev_enabled(ap->link.device)))
3719 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
3721 cmd->result = (DID_BAD_TARGET << 16);
3726 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);