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
53 #define ATA_SCSI_RBUF_SIZE 4096
55 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
56 static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
58 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
60 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
61 const struct scsi_device *scsidev);
62 static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
63 const struct scsi_device *scsidev);
64 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
65 unsigned int id, unsigned int lun);
68 #define RW_RECOVERY_MPAGE 0x1
69 #define RW_RECOVERY_MPAGE_LEN 12
70 #define CACHE_MPAGE 0x8
71 #define CACHE_MPAGE_LEN 20
72 #define CONTROL_MPAGE 0xa
73 #define CONTROL_MPAGE_LEN 12
74 #define ALL_MPAGES 0x3f
75 #define ALL_SUB_MPAGES 0xff
78 static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
80 RW_RECOVERY_MPAGE_LEN - 2,
82 0, /* read retry count */
84 0, /* write retry count */
88 static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
91 0, /* contains WCE, needs to be 0 for logic */
92 0, 0, 0, 0, 0, 0, 0, 0, 0,
93 0, /* contains DRA, needs to be 0 for logic */
97 static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
99 CONTROL_MPAGE_LEN - 2,
100 2, /* DSENSE=0, GLTSD=1 */
101 0, /* [QAM+QERR may be 1, see 05-359r1] */
102 0, 0, 0, 0, 0xff, 0xff,
103 0, 30 /* extended self test time, see 05-359r1 */
107 * libata transport template. libata doesn't do real transport stuff.
108 * It just needs the eh_timed_out hook.
110 static struct scsi_transport_template ata_scsi_transport_template = {
111 .eh_strategy_handler = ata_scsi_error,
112 .eh_timed_out = ata_scsi_timed_out,
113 .user_scan = ata_scsi_user_scan,
117 static const struct {
120 } link_pm_policy[] = {
121 { NOT_AVAILABLE, "max_performance" },
122 { MIN_POWER, "min_power" },
123 { MAX_PERFORMANCE, "max_performance" },
124 { MEDIUM_POWER, "medium_power" },
127 static const char *ata_scsi_lpm_get(enum link_pm policy)
131 for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++)
132 if (link_pm_policy[i].value == policy)
133 return link_pm_policy[i].name;
138 static ssize_t ata_scsi_lpm_put(struct device *dev,
139 struct device_attribute *attr,
140 const char *buf, size_t count)
142 struct Scsi_Host *shost = class_to_shost(dev);
143 struct ata_port *ap = ata_shost_to_port(shost);
144 enum link_pm policy = 0;
148 * we are skipping array location 0 on purpose - this
149 * is because a value of NOT_AVAILABLE is displayed
150 * to the user as max_performance, but when the user
151 * writes "max_performance", they actually want the
152 * value to match MAX_PERFORMANCE.
154 for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) {
155 const int len = strlen(link_pm_policy[i].name);
156 if (strncmp(link_pm_policy[i].name, buf, len) == 0 &&
158 policy = link_pm_policy[i].value;
165 ata_lpm_schedule(ap, policy);
170 ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf)
172 struct Scsi_Host *shost = class_to_shost(dev);
173 struct ata_port *ap = ata_shost_to_port(shost);
175 ata_scsi_lpm_get(ap->pm_policy);
180 return snprintf(buf, 23, "%s\n", policy);
182 DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
183 ata_scsi_lpm_show, ata_scsi_lpm_put);
184 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
186 static ssize_t ata_scsi_park_show(struct device *device,
187 struct device_attribute *attr, char *buf)
189 struct scsi_device *sdev = to_scsi_device(device);
191 struct ata_link *link;
192 struct ata_device *dev;
194 unsigned int uninitialized_var(msecs);
197 ap = ata_shost_to_port(sdev->host);
199 spin_lock_irqsave(ap->lock, flags);
200 dev = ata_scsi_find_dev(ap, sdev);
205 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
211 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
212 link->eh_context.unloaded_mask & (1 << dev->devno) &&
213 time_after(dev->unpark_deadline, jiffies))
214 msecs = jiffies_to_msecs(dev->unpark_deadline - jiffies);
219 spin_unlock_irq(ap->lock);
221 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
224 static ssize_t ata_scsi_park_store(struct device *device,
225 struct device_attribute *attr,
226 const char *buf, size_t len)
228 struct scsi_device *sdev = to_scsi_device(device);
230 struct ata_device *dev;
235 rc = strict_strtol(buf, 10, &input);
236 if (rc || input < -2)
238 if (input > ATA_TMOUT_MAX_PARK) {
240 input = ATA_TMOUT_MAX_PARK;
243 ap = ata_shost_to_port(sdev->host);
245 spin_lock_irqsave(ap->lock, flags);
246 dev = ata_scsi_find_dev(ap, sdev);
247 if (unlikely(!dev)) {
251 if (dev->class != ATA_DEV_ATA) {
257 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
262 dev->unpark_deadline = ata_deadline(jiffies, input);
263 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
264 ata_port_schedule_eh(ap);
265 complete(&ap->park_req_pending);
269 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
272 dev->flags |= ATA_DFLAG_NO_UNLOAD;
277 spin_unlock_irqrestore(ap->lock, flags);
279 return rc ? rc : len;
281 DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
282 ata_scsi_park_show, ata_scsi_park_store);
283 EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
285 static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
287 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
289 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
293 ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
294 const char *buf, size_t count)
296 struct Scsi_Host *shost = class_to_shost(dev);
297 struct ata_port *ap = ata_shost_to_port(shost);
298 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
299 return ap->ops->em_store(ap, buf, count);
304 ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
307 struct Scsi_Host *shost = class_to_shost(dev);
308 struct ata_port *ap = ata_shost_to_port(shost);
310 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
311 return ap->ops->em_show(ap, buf);
314 DEVICE_ATTR(em_message, S_IRUGO | S_IWUGO,
315 ata_scsi_em_message_show, ata_scsi_em_message_store);
316 EXPORT_SYMBOL_GPL(dev_attr_em_message);
319 ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
322 struct Scsi_Host *shost = class_to_shost(dev);
323 struct ata_port *ap = ata_shost_to_port(shost);
325 return snprintf(buf, 23, "%d\n", ap->em_message_type);
327 DEVICE_ATTR(em_message_type, S_IRUGO,
328 ata_scsi_em_message_type_show, NULL);
329 EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
332 ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
335 struct scsi_device *sdev = to_scsi_device(dev);
336 struct ata_port *ap = ata_shost_to_port(sdev->host);
337 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
339 if (ap->ops->sw_activity_show && (ap->flags & ATA_FLAG_SW_ACTIVITY))
340 return ap->ops->sw_activity_show(atadev, buf);
345 ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
346 const char *buf, size_t count)
348 struct scsi_device *sdev = to_scsi_device(dev);
349 struct ata_port *ap = ata_shost_to_port(sdev->host);
350 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
351 enum sw_activity val;
354 if (ap->ops->sw_activity_store && (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
355 val = simple_strtoul(buf, NULL, 0);
357 case OFF: case BLINK_ON: case BLINK_OFF:
358 rc = ap->ops->sw_activity_store(atadev, val);
367 DEVICE_ATTR(sw_activity, S_IWUGO | S_IRUGO, ata_scsi_activity_show,
368 ata_scsi_activity_store);
369 EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
371 struct device_attribute *ata_common_sdev_attrs[] = {
372 &dev_attr_unload_heads,
375 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
377 static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
378 void (*done)(struct scsi_cmnd *))
380 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
381 /* "Invalid field in cbd" */
386 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
387 * @sdev: SCSI device for which BIOS geometry is to be determined
388 * @bdev: block device associated with @sdev
389 * @capacity: capacity of SCSI device
390 * @geom: location to which geometry will be output
392 * Generic bios head/sector/cylinder calculator
393 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
394 * mapping. Some situations may arise where the disk is not
395 * bootable if this is not used.
398 * Defined by the SCSI layer. We don't really care.
403 int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
404 sector_t capacity, int geom[])
408 sector_div(capacity, 255*63);
415 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
416 * @sdev: SCSI device to get identify data for
417 * @arg: User buffer area for identify data
420 * Defined by the SCSI layer. We don't really care.
423 * Zero on success, negative errno on error.
425 static int ata_get_identity(struct scsi_device *sdev, void __user *arg)
427 struct ata_port *ap = ata_shost_to_port(sdev->host);
428 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
429 u16 __user *dst = arg;
435 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
438 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
439 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
442 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
443 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
446 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
447 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
454 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
455 * @scsidev: Device to which we are issuing command
456 * @arg: User provided data for issuing command
459 * Defined by the SCSI layer. We don't really care.
462 * Zero on success, negative errno on error.
464 int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
467 u8 scsi_cmd[MAX_COMMAND_SIZE];
468 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
470 enum dma_data_direction data_dir;
476 if (copy_from_user(args, arg, sizeof(args)))
479 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
483 memset(scsi_cmd, 0, sizeof(scsi_cmd));
486 argsize = SECTOR_SIZE * args[3];
487 argbuf = kmalloc(argsize, GFP_KERNEL);
488 if (argbuf == NULL) {
493 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
494 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
495 block count in sector count field */
496 data_dir = DMA_FROM_DEVICE;
498 scsi_cmd[1] = (3 << 1); /* Non-data */
499 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
503 scsi_cmd[0] = ATA_16;
505 scsi_cmd[4] = args[2];
506 if (args[0] == WIN_SMART) { /* hack -- ide driver does this too... */
507 scsi_cmd[6] = args[3];
508 scsi_cmd[8] = args[1];
512 scsi_cmd[6] = args[1];
514 scsi_cmd[14] = args[0];
516 /* Good values for timeout and retries? Values below
517 from scsi_ioctl_send_command() for default case... */
518 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
519 sensebuf, (10*HZ), 5, 0);
521 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
522 u8 *desc = sensebuf + 8;
523 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
525 /* If we set cc then ATA pass-through will cause a
526 * check condition even if no error. Filter that. */
527 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
528 struct scsi_sense_hdr sshdr;
529 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
531 if (sshdr.sense_key == 0 &&
532 sshdr.asc == 0 && sshdr.ascq == 0)
533 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
536 /* Send userspace a few ATA registers (same as drivers/ide) */
537 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
538 desc[0] == 0x09) { /* code is "ATA Descriptor" */
539 args[0] = desc[13]; /* status */
540 args[1] = desc[3]; /* error */
541 args[2] = desc[5]; /* sector count (0:7) */
542 if (copy_to_user(arg, args, sizeof(args)))
554 && copy_to_user(arg + sizeof(args), argbuf, argsize))
563 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
564 * @scsidev: Device to which we are issuing command
565 * @arg: User provided data for issuing command
568 * Defined by the SCSI layer. We don't really care.
571 * Zero on success, negative errno on error.
573 int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
576 u8 scsi_cmd[MAX_COMMAND_SIZE];
577 u8 args[7], *sensebuf = NULL;
583 if (copy_from_user(args, arg, sizeof(args)))
586 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
590 memset(scsi_cmd, 0, sizeof(scsi_cmd));
591 scsi_cmd[0] = ATA_16;
592 scsi_cmd[1] = (3 << 1); /* Non-data */
593 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
594 scsi_cmd[4] = args[1];
595 scsi_cmd[6] = args[2];
596 scsi_cmd[8] = args[3];
597 scsi_cmd[10] = args[4];
598 scsi_cmd[12] = args[5];
599 scsi_cmd[13] = args[6] & 0x4f;
600 scsi_cmd[14] = args[0];
602 /* Good values for timeout and retries? Values below
603 from scsi_ioctl_send_command() for default case... */
604 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
605 sensebuf, (10*HZ), 5, 0);
607 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
608 u8 *desc = sensebuf + 8;
609 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
611 /* If we set cc then ATA pass-through will cause a
612 * check condition even if no error. Filter that. */
613 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
614 struct scsi_sense_hdr sshdr;
615 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
617 if (sshdr.sense_key == 0 &&
618 sshdr.asc == 0 && sshdr.ascq == 0)
619 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
622 /* Send userspace ATA registers */
623 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
624 desc[0] == 0x09) {/* code is "ATA Descriptor" */
625 args[0] = desc[13]; /* status */
626 args[1] = desc[3]; /* error */
627 args[2] = desc[5]; /* sector count (0:7) */
628 args[3] = desc[7]; /* lbal */
629 args[4] = desc[9]; /* lbam */
630 args[5] = desc[11]; /* lbah */
631 args[6] = desc[12]; /* select */
632 if (copy_to_user(arg, args, sizeof(args)))
647 int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
649 int val = -EINVAL, rc = -EINVAL;
652 case ATA_IOC_GET_IO32:
654 if (copy_to_user(arg, &val, 1))
658 case ATA_IOC_SET_IO32:
659 val = (unsigned long) arg;
664 case HDIO_GET_IDENTITY:
665 return ata_get_identity(scsidev, arg);
668 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
670 return ata_cmd_ioctl(scsidev, arg);
672 case HDIO_DRIVE_TASK:
673 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
675 return ata_task_ioctl(scsidev, arg);
686 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
687 * @dev: ATA device to which the new command is attached
688 * @cmd: SCSI command that originated this ATA command
689 * @done: SCSI command completion function
691 * Obtain a reference to an unused ata_queued_cmd structure,
692 * which is the basic libata structure representing a single
693 * ATA command sent to the hardware.
695 * If a command was available, fill in the SCSI-specific
696 * portions of the structure with information on the
700 * spin_lock_irqsave(host lock)
703 * Command allocated, or %NULL if none available.
705 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
706 struct scsi_cmnd *cmd,
707 void (*done)(struct scsi_cmnd *))
709 struct ata_queued_cmd *qc;
711 qc = ata_qc_new_init(dev);
716 qc->sg = scsi_sglist(cmd);
717 qc->n_elem = scsi_sg_count(cmd);
719 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
726 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
728 struct scsi_cmnd *scmd = qc->scsicmd;
730 qc->extrabytes = scmd->request->extra_len;
731 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
735 * ata_dump_status - user friendly display of error info
736 * @id: id of the port in question
737 * @tf: ptr to filled out taskfile
739 * Decode and dump the ATA error/status registers for the user so
740 * that they have some idea what really happened at the non
741 * make-believe layer.
744 * inherited from caller
746 static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
748 u8 stat = tf->command, err = tf->feature;
750 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
751 if (stat & ATA_BUSY) {
752 printk("Busy }\n"); /* Data is not valid in this case */
754 if (stat & 0x40) printk("DriveReady ");
755 if (stat & 0x20) printk("DeviceFault ");
756 if (stat & 0x10) printk("SeekComplete ");
757 if (stat & 0x08) printk("DataRequest ");
758 if (stat & 0x04) printk("CorrectedError ");
759 if (stat & 0x02) printk("Index ");
760 if (stat & 0x01) printk("Error ");
764 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
765 if (err & 0x04) printk("DriveStatusError ");
767 if (err & 0x04) printk("BadCRC ");
768 else printk("Sector ");
770 if (err & 0x40) printk("UncorrectableError ");
771 if (err & 0x10) printk("SectorIdNotFound ");
772 if (err & 0x02) printk("TrackZeroNotFound ");
773 if (err & 0x01) printk("AddrMarkNotFound ");
780 * ata_to_sense_error - convert ATA error to SCSI error
781 * @id: ATA device number
782 * @drv_stat: value contained in ATA status register
783 * @drv_err: value contained in ATA error register
784 * @sk: the sense key we'll fill out
785 * @asc: the additional sense code we'll fill out
786 * @ascq: the additional sense code qualifier we'll fill out
787 * @verbose: be verbose
789 * Converts an ATA error into a SCSI error. Fill out pointers to
790 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
791 * format sense blocks.
794 * spin_lock_irqsave(host lock)
796 static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
797 u8 *asc, u8 *ascq, int verbose)
801 /* Based on the 3ware driver translation table */
802 static const unsigned char sense_table[][4] = {
804 {0xd1, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
806 {0xd0, ABORTED_COMMAND, 0x00, 0x00}, // Device busy Aborted command
808 {0x61, HARDWARE_ERROR, 0x00, 0x00}, // Device fault Hardware error
809 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
810 {0x84, ABORTED_COMMAND, 0x47, 0x00}, // Data CRC error SCSI parity error
811 /* MC|ID|ABRT|TRK0|MARK */
812 {0x37, NOT_READY, 0x04, 0x00}, // Unit offline Not ready
814 {0x09, NOT_READY, 0x04, 0x00}, // Unrecovered disk error Not ready
815 /* Bad address mark */
816 {0x01, MEDIUM_ERROR, 0x13, 0x00}, // Address mark not found Address mark not found for data field
818 {0x02, HARDWARE_ERROR, 0x00, 0x00}, // Track 0 not found Hardware error
820 {0x04, ABORTED_COMMAND, 0x00, 0x00}, // Aborted command Aborted command
821 /* Media change request */
822 {0x08, NOT_READY, 0x04, 0x00}, // Media change request FIXME: faking offline
824 {0x10, ABORTED_COMMAND, 0x14, 0x00}, // ID not found Recorded entity not found
826 {0x08, NOT_READY, 0x04, 0x00}, // Media change FIXME: faking offline
828 {0x40, MEDIUM_ERROR, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
829 /* BBD - block marked bad */
830 {0x80, MEDIUM_ERROR, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
831 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
833 static const unsigned char stat_table[][4] = {
834 /* Must be first because BUSY means no other bits valid */
835 {0x80, ABORTED_COMMAND, 0x47, 0x00}, // Busy, fake parity for now
836 {0x20, HARDWARE_ERROR, 0x00, 0x00}, // Device fault
837 {0x08, ABORTED_COMMAND, 0x47, 0x00}, // Timed out in xfer, fake parity for now
838 {0x04, RECOVERED_ERROR, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
839 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
843 * Is this an error we can process/parse
845 if (drv_stat & ATA_BUSY) {
846 drv_err = 0; /* Ignore the err bits, they're invalid */
850 /* Look for drv_err */
851 for (i = 0; sense_table[i][0] != 0xFF; i++) {
852 /* Look for best matches first */
853 if ((sense_table[i][0] & drv_err) ==
855 *sk = sense_table[i][1];
856 *asc = sense_table[i][2];
857 *ascq = sense_table[i][3];
861 /* No immediate match */
863 printk(KERN_WARNING "ata%u: no sense translation for "
864 "error 0x%02x\n", id, drv_err);
867 /* Fall back to interpreting status bits */
868 for (i = 0; stat_table[i][0] != 0xFF; i++) {
869 if (stat_table[i][0] & drv_stat) {
870 *sk = stat_table[i][1];
871 *asc = stat_table[i][2];
872 *ascq = stat_table[i][3];
876 /* No error? Undecoded? */
878 printk(KERN_WARNING "ata%u: no sense translation for "
879 "status: 0x%02x\n", id, drv_stat);
881 /* We need a sensible error return here, which is tricky, and one
882 that won't cause people to do things like return a disk wrongly */
883 *sk = ABORTED_COMMAND;
889 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
890 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
891 id, drv_stat, drv_err, *sk, *asc, *ascq);
896 * ata_gen_passthru_sense - Generate check condition sense block.
897 * @qc: Command that completed.
899 * This function is specific to the ATA descriptor format sense
900 * block specified for the ATA pass through commands. Regardless
901 * of whether the command errored or not, return a sense
902 * block. Copy all controller registers into the sense
903 * block. Clear sense key, ASC & ASCQ if there is no error.
908 static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
910 struct scsi_cmnd *cmd = qc->scsicmd;
911 struct ata_taskfile *tf = &qc->result_tf;
912 unsigned char *sb = cmd->sense_buffer;
913 unsigned char *desc = sb + 8;
914 int verbose = qc->ap->ops->error_handler == NULL;
916 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
918 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
921 * Use ata_to_sense_error() to map status register bits
922 * onto sense key, asc & ascq.
925 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
926 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
927 &sb[1], &sb[2], &sb[3], verbose);
932 * Sense data is current and format is descriptor.
938 /* set length of additional sense data */
943 * Copy registers into sense buffer.
946 desc[3] = tf->feature; /* == error reg */
951 desc[12] = tf->device;
952 desc[13] = tf->command; /* == status reg */
955 * Fill in Extend bit, and the high order bytes
958 if (tf->flags & ATA_TFLAG_LBA48) {
960 desc[4] = tf->hob_nsect;
961 desc[6] = tf->hob_lbal;
962 desc[8] = tf->hob_lbam;
963 desc[10] = tf->hob_lbah;
968 * ata_gen_ata_sense - generate a SCSI fixed sense block
969 * @qc: Command that we are erroring out
971 * Generate sense block for a failed ATA command @qc. Descriptor
972 * format is used to accomodate LBA48 block address.
977 static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
979 struct ata_device *dev = qc->dev;
980 struct scsi_cmnd *cmd = qc->scsicmd;
981 struct ata_taskfile *tf = &qc->result_tf;
982 unsigned char *sb = cmd->sense_buffer;
983 unsigned char *desc = sb + 8;
984 int verbose = qc->ap->ops->error_handler == NULL;
987 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
989 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
991 /* sense data is current and format is descriptor */
994 /* Use ata_to_sense_error() to map status register bits
995 * onto sense key, asc & ascq.
998 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
999 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1000 &sb[1], &sb[2], &sb[3], verbose);
1004 block = ata_tf_read_block(&qc->result_tf, dev);
1006 /* information sense data descriptor */
1011 desc[2] |= 0x80; /* valid */
1012 desc[6] = block >> 40;
1013 desc[7] = block >> 32;
1014 desc[8] = block >> 24;
1015 desc[9] = block >> 16;
1016 desc[10] = block >> 8;
1020 static void ata_scsi_sdev_config(struct scsi_device *sdev)
1022 sdev->use_10_for_rw = 1;
1023 sdev->use_10_for_ms = 1;
1025 /* Schedule policy is determined by ->qc_defer() callback and
1026 * it needs to see every deferred qc. Set dev_blocked to 1 to
1027 * prevent SCSI midlayer from automatically deferring
1030 sdev->max_device_blocked = 1;
1034 * atapi_drain_needed - Check whether data transfer may overflow
1035 * @rq: request to be checked
1037 * ATAPI commands which transfer variable length data to host
1038 * might overflow due to application error or hardare bug. This
1039 * function checks whether overflow should be drained and ignored
1046 * 1 if ; otherwise, 0.
1048 static int atapi_drain_needed(struct request *rq)
1050 if (likely(!blk_pc_request(rq)))
1053 if (!rq->data_len || (rq->cmd_flags & REQ_RW))
1056 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1059 static int ata_scsi_dev_config(struct scsi_device *sdev,
1060 struct ata_device *dev)
1062 if (!ata_id_has_unload(dev->id))
1063 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1065 /* configure max sectors */
1066 blk_queue_max_sectors(sdev->request_queue, dev->max_sectors);
1068 if (dev->class == ATA_DEV_ATAPI) {
1069 struct request_queue *q = sdev->request_queue;
1072 /* set the min alignment and padding */
1073 blk_queue_update_dma_alignment(sdev->request_queue,
1074 ATA_DMA_PAD_SZ - 1);
1075 blk_queue_update_dma_pad(sdev->request_queue,
1076 ATA_DMA_PAD_SZ - 1);
1078 /* configure draining */
1079 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1081 ata_dev_printk(dev, KERN_ERR,
1082 "drain buffer allocation failed\n");
1086 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1088 /* ATA devices must be sector aligned */
1089 blk_queue_update_dma_alignment(sdev->request_queue,
1091 sdev->manage_start_stop = 1;
1094 if (dev->flags & ATA_DFLAG_AN)
1095 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1097 if (dev->flags & ATA_DFLAG_NCQ) {
1100 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1101 depth = min(ATA_MAX_QUEUE - 1, depth);
1102 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
1109 * ata_scsi_slave_config - Set SCSI device attributes
1110 * @sdev: SCSI device to examine
1112 * This is called before we actually start reading
1113 * and writing to the device, to configure certain
1114 * SCSI mid-layer behaviors.
1117 * Defined by SCSI layer. We don't really care.
1120 int ata_scsi_slave_config(struct scsi_device *sdev)
1122 struct ata_port *ap = ata_shost_to_port(sdev->host);
1123 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1126 ata_scsi_sdev_config(sdev);
1129 rc = ata_scsi_dev_config(sdev, dev);
1135 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1136 * @sdev: SCSI device to be destroyed
1138 * @sdev is about to be destroyed for hot/warm unplugging. If
1139 * this unplugging was initiated by libata as indicated by NULL
1140 * dev->sdev, this function doesn't have to do anything.
1141 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1142 * Clear dev->sdev, schedule the device for ATA detach and invoke
1146 * Defined by SCSI layer. We don't really care.
1148 void ata_scsi_slave_destroy(struct scsi_device *sdev)
1150 struct ata_port *ap = ata_shost_to_port(sdev->host);
1151 struct request_queue *q = sdev->request_queue;
1152 unsigned long flags;
1153 struct ata_device *dev;
1155 if (!ap->ops->error_handler)
1158 spin_lock_irqsave(ap->lock, flags);
1159 dev = __ata_scsi_find_dev(ap, sdev);
1160 if (dev && dev->sdev) {
1161 /* SCSI device already in CANCEL state, no need to offline it */
1163 dev->flags |= ATA_DFLAG_DETACH;
1164 ata_port_schedule_eh(ap);
1166 spin_unlock_irqrestore(ap->lock, flags);
1168 kfree(q->dma_drain_buffer);
1169 q->dma_drain_buffer = NULL;
1170 q->dma_drain_size = 0;
1174 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1175 * @sdev: SCSI device to configure queue depth for
1176 * @queue_depth: new queue depth
1178 * This is libata standard hostt->change_queue_depth callback.
1179 * SCSI will call into this callback when user tries to set queue
1183 * SCSI layer (we don't care)
1186 * Newly configured queue depth.
1188 int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
1190 struct ata_port *ap = ata_shost_to_port(sdev->host);
1191 struct ata_device *dev;
1192 unsigned long flags;
1194 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1195 return sdev->queue_depth;
1197 dev = ata_scsi_find_dev(ap, sdev);
1198 if (!dev || !ata_dev_enabled(dev))
1199 return sdev->queue_depth;
1202 spin_lock_irqsave(ap->lock, flags);
1203 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1204 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1205 dev->flags |= ATA_DFLAG_NCQ_OFF;
1208 spin_unlock_irqrestore(ap->lock, flags);
1210 /* limit and apply queue depth */
1211 queue_depth = min(queue_depth, sdev->host->can_queue);
1212 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1213 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1215 if (sdev->queue_depth == queue_depth)
1218 scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, queue_depth);
1222 /* XXX: for spindown warning */
1223 static void ata_delayed_done_timerfn(unsigned long arg)
1225 struct scsi_cmnd *scmd = (void *)arg;
1227 scmd->scsi_done(scmd);
1230 /* XXX: for spindown warning */
1231 static void ata_delayed_done(struct scsi_cmnd *scmd)
1233 static struct timer_list timer;
1235 setup_timer(&timer, ata_delayed_done_timerfn, (unsigned long)scmd);
1236 mod_timer(&timer, jiffies + 5 * HZ);
1240 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1241 * @qc: Storage for translated ATA taskfile
1243 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1244 * (to start). Perhaps these commands should be preceded by
1245 * CHECK POWER MODE to see what power mode the device is already in.
1246 * [See SAT revision 5 at www.t10.org]
1249 * spin_lock_irqsave(host lock)
1252 * Zero on success, non-zero on error.
1254 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1256 struct scsi_cmnd *scmd = qc->scsicmd;
1257 struct ata_taskfile *tf = &qc->tf;
1258 const u8 *cdb = scmd->cmnd;
1260 if (scmd->cmd_len < 5)
1263 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1264 tf->protocol = ATA_PROT_NODATA;
1266 ; /* ignore IMMED bit, violates sat-r05 */
1269 goto invalid_fld; /* LOEJ bit set not supported */
1270 if (((cdb[4] >> 4) & 0xf) != 0)
1271 goto invalid_fld; /* power conditions not supported */
1274 tf->nsect = 1; /* 1 sector, lba=0 */
1276 if (qc->dev->flags & ATA_DFLAG_LBA) {
1277 tf->flags |= ATA_TFLAG_LBA;
1282 tf->device |= ATA_LBA;
1285 tf->lbal = 0x1; /* sect */
1286 tf->lbam = 0x0; /* cyl low */
1287 tf->lbah = 0x0; /* cyl high */
1290 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1292 /* XXX: This is for backward compatibility, will be
1293 * removed. Read Documentation/feature-removal-schedule.txt
1296 if ((qc->dev->flags & ATA_DFLAG_SPUNDOWN) &&
1297 (system_state == SYSTEM_HALT ||
1298 system_state == SYSTEM_POWER_OFF)) {
1299 static unsigned long warned;
1301 if (!test_and_set_bit(0, &warned)) {
1302 ata_dev_printk(qc->dev, KERN_WARNING,
1303 "DISK MIGHT NOT BE SPUN DOWN PROPERLY. "
1304 "UPDATE SHUTDOWN UTILITY\n");
1305 ata_dev_printk(qc->dev, KERN_WARNING,
1306 "For more info, visit "
1307 "http://linux-ata.org/shutdown.html\n");
1309 /* ->scsi_done is not used, use it for
1310 * delayed completion.
1312 scmd->scsi_done = qc->scsidone;
1313 qc->scsidone = ata_delayed_done;
1315 scmd->result = SAM_STAT_GOOD;
1319 /* Issue ATA STANDBY IMMEDIATE command */
1320 tf->command = ATA_CMD_STANDBYNOW1;
1324 * Standby and Idle condition timers could be implemented but that
1325 * would require libata to implement the Power condition mode page
1326 * and allow the user to change it. Changing mode pages requires
1327 * MODE SELECT to be implemented.
1333 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1334 /* "Invalid field in cbd" */
1340 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1341 * @qc: Storage for translated ATA taskfile
1343 * Sets up an ATA taskfile to issue FLUSH CACHE or
1347 * spin_lock_irqsave(host lock)
1350 * Zero on success, non-zero on error.
1352 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1354 struct ata_taskfile *tf = &qc->tf;
1356 tf->flags |= ATA_TFLAG_DEVICE;
1357 tf->protocol = ATA_PROT_NODATA;
1359 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1360 tf->command = ATA_CMD_FLUSH_EXT;
1362 tf->command = ATA_CMD_FLUSH;
1364 /* flush is critical for IO integrity, consider it an IO command */
1365 qc->flags |= ATA_QCFLAG_IO;
1371 * scsi_6_lba_len - Get LBA and transfer length
1372 * @cdb: SCSI command to translate
1374 * Calculate LBA and transfer length for 6-byte commands.
1378 * @plen: the transfer length
1380 static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1385 VPRINTK("six-byte command\n");
1387 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1388 lba |= ((u64)cdb[2]) << 8;
1389 lba |= ((u64)cdb[3]);
1398 * scsi_10_lba_len - Get LBA and transfer length
1399 * @cdb: SCSI command to translate
1401 * Calculate LBA and transfer length for 10-byte commands.
1405 * @plen: the transfer length
1407 static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1412 VPRINTK("ten-byte command\n");
1414 lba |= ((u64)cdb[2]) << 24;
1415 lba |= ((u64)cdb[3]) << 16;
1416 lba |= ((u64)cdb[4]) << 8;
1417 lba |= ((u64)cdb[5]);
1419 len |= ((u32)cdb[7]) << 8;
1420 len |= ((u32)cdb[8]);
1427 * scsi_16_lba_len - Get LBA and transfer length
1428 * @cdb: SCSI command to translate
1430 * Calculate LBA and transfer length for 16-byte commands.
1434 * @plen: the transfer length
1436 static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1441 VPRINTK("sixteen-byte command\n");
1443 lba |= ((u64)cdb[2]) << 56;
1444 lba |= ((u64)cdb[3]) << 48;
1445 lba |= ((u64)cdb[4]) << 40;
1446 lba |= ((u64)cdb[5]) << 32;
1447 lba |= ((u64)cdb[6]) << 24;
1448 lba |= ((u64)cdb[7]) << 16;
1449 lba |= ((u64)cdb[8]) << 8;
1450 lba |= ((u64)cdb[9]);
1452 len |= ((u32)cdb[10]) << 24;
1453 len |= ((u32)cdb[11]) << 16;
1454 len |= ((u32)cdb[12]) << 8;
1455 len |= ((u32)cdb[13]);
1462 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1463 * @qc: Storage for translated ATA taskfile
1465 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1468 * spin_lock_irqsave(host lock)
1471 * Zero on success, non-zero on error.
1473 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1475 struct scsi_cmnd *scmd = qc->scsicmd;
1476 struct ata_taskfile *tf = &qc->tf;
1477 struct ata_device *dev = qc->dev;
1478 u64 dev_sectors = qc->dev->n_sectors;
1479 const u8 *cdb = scmd->cmnd;
1483 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1484 tf->protocol = ATA_PROT_NODATA;
1486 if (cdb[0] == VERIFY) {
1487 if (scmd->cmd_len < 10)
1489 scsi_10_lba_len(cdb, &block, &n_block);
1490 } else if (cdb[0] == VERIFY_16) {
1491 if (scmd->cmd_len < 16)
1493 scsi_16_lba_len(cdb, &block, &n_block);
1499 if (block >= dev_sectors)
1501 if ((block + n_block) > dev_sectors)
1504 if (dev->flags & ATA_DFLAG_LBA) {
1505 tf->flags |= ATA_TFLAG_LBA;
1507 if (lba_28_ok(block, n_block)) {
1509 tf->command = ATA_CMD_VERIFY;
1510 tf->device |= (block >> 24) & 0xf;
1511 } else if (lba_48_ok(block, n_block)) {
1512 if (!(dev->flags & ATA_DFLAG_LBA48))
1516 tf->flags |= ATA_TFLAG_LBA48;
1517 tf->command = ATA_CMD_VERIFY_EXT;
1519 tf->hob_nsect = (n_block >> 8) & 0xff;
1521 tf->hob_lbah = (block >> 40) & 0xff;
1522 tf->hob_lbam = (block >> 32) & 0xff;
1523 tf->hob_lbal = (block >> 24) & 0xff;
1525 /* request too large even for LBA48 */
1528 tf->nsect = n_block & 0xff;
1530 tf->lbah = (block >> 16) & 0xff;
1531 tf->lbam = (block >> 8) & 0xff;
1532 tf->lbal = block & 0xff;
1534 tf->device |= ATA_LBA;
1537 u32 sect, head, cyl, track;
1539 if (!lba_28_ok(block, n_block))
1542 /* Convert LBA to CHS */
1543 track = (u32)block / dev->sectors;
1544 cyl = track / dev->heads;
1545 head = track % dev->heads;
1546 sect = (u32)block % dev->sectors + 1;
1548 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1549 (u32)block, track, cyl, head, sect);
1551 /* Check whether the converted CHS can fit.
1555 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1558 tf->command = ATA_CMD_VERIFY;
1559 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1562 tf->lbah = cyl >> 8;
1569 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1570 /* "Invalid field in cbd" */
1574 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1575 /* "Logical Block Address out of range" */
1579 scmd->result = SAM_STAT_GOOD;
1584 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1585 * @qc: Storage for translated ATA taskfile
1587 * Converts any of six SCSI read/write commands into the
1588 * ATA counterpart, including starting sector (LBA),
1589 * sector count, and taking into account the device's LBA48
1592 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1593 * %WRITE_16 are currently supported.
1596 * spin_lock_irqsave(host lock)
1599 * Zero on success, non-zero on error.
1601 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1603 struct scsi_cmnd *scmd = qc->scsicmd;
1604 const u8 *cdb = scmd->cmnd;
1605 unsigned int tf_flags = 0;
1610 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1611 tf_flags |= ATA_TFLAG_WRITE;
1613 /* Calculate the SCSI LBA, transfer length and FUA. */
1617 if (unlikely(scmd->cmd_len < 10))
1619 scsi_10_lba_len(cdb, &block, &n_block);
1620 if (unlikely(cdb[1] & (1 << 3)))
1621 tf_flags |= ATA_TFLAG_FUA;
1625 if (unlikely(scmd->cmd_len < 6))
1627 scsi_6_lba_len(cdb, &block, &n_block);
1629 /* for 6-byte r/w commands, transfer length 0
1630 * means 256 blocks of data, not 0 block.
1637 if (unlikely(scmd->cmd_len < 16))
1639 scsi_16_lba_len(cdb, &block, &n_block);
1640 if (unlikely(cdb[1] & (1 << 3)))
1641 tf_flags |= ATA_TFLAG_FUA;
1644 DPRINTK("no-byte command\n");
1648 /* Check and compose ATA command */
1650 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1651 * length 0 means transfer 0 block of data.
1652 * However, for ATA R/W commands, sector count 0 means
1653 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1655 * WARNING: one or two older ATA drives treat 0 as 0...
1659 qc->flags |= ATA_QCFLAG_IO;
1660 qc->nbytes = n_block * ATA_SECT_SIZE;
1662 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1664 if (likely(rc == 0))
1669 /* treat all other errors as -EINVAL, fall through */
1671 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1672 /* "Invalid field in cbd" */
1676 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1677 /* "Logical Block Address out of range" */
1681 scmd->result = SAM_STAT_GOOD;
1685 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1687 struct ata_port *ap = qc->ap;
1688 struct scsi_cmnd *cmd = qc->scsicmd;
1689 u8 *cdb = cmd->cmnd;
1690 int need_sense = (qc->err_mask != 0);
1692 /* For ATA pass thru (SAT) commands, generate a sense block if
1693 * user mandated it or if there's an error. Note that if we
1694 * generate because the user forced us to, a check condition
1695 * is generated and the ATA register values are returned
1696 * whether the command completed successfully or not. If there
1697 * was no error, SK, ASC and ASCQ will all be zero.
1699 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1700 ((cdb[2] & 0x20) || need_sense)) {
1701 ata_gen_passthru_sense(qc);
1704 cmd->result = SAM_STAT_GOOD;
1706 /* TODO: decide which descriptor format to use
1707 * for 48b LBA devices and call that here
1708 * instead of the fixed desc, which is only
1709 * good for smaller LBA (and maybe CHS?)
1712 ata_gen_ata_sense(qc);
1716 /* XXX: track spindown state for spindown skipping and warning */
1717 if (unlikely(qc->tf.command == ATA_CMD_STANDBY ||
1718 qc->tf.command == ATA_CMD_STANDBYNOW1))
1719 qc->dev->flags |= ATA_DFLAG_SPUNDOWN;
1720 else if (likely(system_state != SYSTEM_HALT &&
1721 system_state != SYSTEM_POWER_OFF))
1722 qc->dev->flags &= ~ATA_DFLAG_SPUNDOWN;
1724 if (need_sense && !ap->ops->error_handler)
1725 ata_dump_status(ap->print_id, &qc->result_tf);
1733 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1734 * @dev: ATA device to which the command is addressed
1735 * @cmd: SCSI command to execute
1736 * @done: SCSI command completion function
1737 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1739 * Our ->queuecommand() function has decided that the SCSI
1740 * command issued can be directly translated into an ATA
1741 * command, rather than handled internally.
1743 * This function sets up an ata_queued_cmd structure for the
1744 * SCSI command, and sends that ata_queued_cmd to the hardware.
1746 * The xlat_func argument (actor) returns 0 if ready to execute
1747 * ATA command, else 1 to finish translation. If 1 is returned
1748 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1749 * to be set reflecting an error condition or clean (early)
1753 * spin_lock_irqsave(host lock)
1756 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1757 * needs to be deferred.
1759 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1760 void (*done)(struct scsi_cmnd *),
1761 ata_xlat_func_t xlat_func)
1763 struct ata_port *ap = dev->link->ap;
1764 struct ata_queued_cmd *qc;
1769 qc = ata_scsi_qc_new(dev, cmd, done);
1773 /* data is present; dma-map it */
1774 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1775 cmd->sc_data_direction == DMA_TO_DEVICE) {
1776 if (unlikely(scsi_bufflen(cmd) < 1)) {
1777 ata_dev_printk(dev, KERN_WARNING,
1778 "WARNING: zero len r/w req\n");
1782 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1784 qc->dma_dir = cmd->sc_data_direction;
1787 qc->complete_fn = ata_scsi_qc_complete;
1792 if (ap->ops->qc_defer) {
1793 if ((rc = ap->ops->qc_defer(qc)))
1797 /* select device, send command to hardware */
1806 DPRINTK("EXIT - early finish (good or error)\n");
1811 cmd->result = (DID_ERROR << 16);
1814 DPRINTK("EXIT - internal\n");
1819 DPRINTK("EXIT - defer\n");
1820 if (rc == ATA_DEFER_LINK)
1821 return SCSI_MLQUEUE_DEVICE_BUSY;
1823 return SCSI_MLQUEUE_HOST_BUSY;
1827 * ata_scsi_rbuf_get - Map response buffer.
1828 * @cmd: SCSI command containing buffer to be mapped.
1829 * @flags: unsigned long variable to store irq enable status
1830 * @copy_in: copy in from user buffer
1832 * Prepare buffer for simulated SCSI commands.
1835 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1838 * Pointer to response buffer.
1840 static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1841 unsigned long *flags)
1843 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1845 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1847 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1848 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1849 return ata_scsi_rbuf;
1853 * ata_scsi_rbuf_put - Unmap response buffer.
1854 * @cmd: SCSI command containing buffer to be unmapped.
1855 * @copy_out: copy out result
1856 * @flags: @flags passed to ata_scsi_rbuf_get()
1858 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1859 * @copy_back is true.
1862 * Unlocks ata_scsi_rbuf_lock.
1864 static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1865 unsigned long *flags)
1868 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1869 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1870 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1874 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1875 * @args: device IDENTIFY data / SCSI command of interest.
1876 * @actor: Callback hook for desired SCSI command simulator
1878 * Takes care of the hard work of simulating a SCSI command...
1879 * Mapping the response buffer, calling the command's handler,
1880 * and handling the handler's return value. This return value
1881 * indicates whether the handler wishes the SCSI command to be
1882 * completed successfully (0), or not (in which case cmd->result
1883 * and sense buffer are assumed to be set).
1886 * spin_lock_irqsave(host lock)
1888 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1889 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1893 struct scsi_cmnd *cmd = args->cmd;
1894 unsigned long flags;
1896 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1897 rc = actor(args, rbuf);
1898 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1901 cmd->result = SAM_STAT_GOOD;
1906 * ata_scsiop_inq_std - Simulate INQUIRY command
1907 * @args: device IDENTIFY data / SCSI command of interest.
1908 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1910 * Returns standard device identification data associated
1911 * with non-VPD INQUIRY command output.
1914 * spin_lock_irqsave(host lock)
1916 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1918 const u8 versions[] = {
1919 0x60, /* SAM-3 (no version claimed) */
1922 0x20, /* SBC-2 (no version claimed) */
1925 0x60 /* SPC-3 (no version claimed) */
1930 0x5, /* claim SPC-3 version compatibility */
1937 /* set scsi removeable (RMB) bit per ata bit */
1938 if (ata_id_removeable(args->id))
1941 memcpy(rbuf, hdr, sizeof(hdr));
1942 memcpy(&rbuf[8], "ATA ", 8);
1943 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1944 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1946 if (rbuf[32] == 0 || rbuf[32] == ' ')
1947 memcpy(&rbuf[32], "n/a ", 4);
1949 memcpy(rbuf + 59, versions, sizeof(versions));
1955 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1956 * @args: device IDENTIFY data / SCSI command of interest.
1957 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1959 * Returns list of inquiry VPD pages available.
1962 * spin_lock_irqsave(host lock)
1964 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1966 const u8 pages[] = {
1967 0x00, /* page 0x00, this page */
1968 0x80, /* page 0x80, unit serial no page */
1969 0x83, /* page 0x83, device ident page */
1970 0x89, /* page 0x89, ata info page */
1971 0xb1, /* page 0xb1, block device characteristics page */
1974 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
1975 memcpy(rbuf + 4, pages, sizeof(pages));
1980 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1981 * @args: device IDENTIFY data / SCSI command of interest.
1982 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1984 * Returns ATA device serial number.
1987 * spin_lock_irqsave(host lock)
1989 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
1993 0x80, /* this page code */
1995 ATA_ID_SERNO_LEN, /* page len */
1998 memcpy(rbuf, hdr, sizeof(hdr));
1999 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2000 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2005 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2006 * @args: device IDENTIFY data / SCSI command of interest.
2007 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2009 * Yields two logical unit device identification designators:
2010 * - vendor specific ASCII containing the ATA serial number
2011 * - SAT defined "t10 vendor id based" containing ASCII vendor
2012 * name ("ATA "), model and serial numbers.
2015 * spin_lock_irqsave(host lock)
2017 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2019 const int sat_model_serial_desc_len = 68;
2022 rbuf[1] = 0x83; /* this page code */
2025 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2027 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2029 ata_id_string(args->id, (unsigned char *) rbuf + num,
2030 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2031 num += ATA_ID_SERNO_LEN;
2033 /* SAT defined lu model and serial numbers descriptor */
2034 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2037 rbuf[num + 3] = sat_model_serial_desc_len;
2039 memcpy(rbuf + num, "ATA ", 8);
2041 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2043 num += ATA_ID_PROD_LEN;
2044 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2046 num += ATA_ID_SERNO_LEN;
2048 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2053 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2054 * @args: device IDENTIFY data / SCSI command of interest.
2055 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2057 * Yields SAT-specified ATA VPD page.
2060 * spin_lock_irqsave(host lock)
2062 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2064 struct ata_taskfile tf;
2066 memset(&tf, 0, sizeof(tf));
2068 rbuf[1] = 0x89; /* our page code */
2069 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2070 rbuf[3] = (0x238 & 0xff);
2072 memcpy(&rbuf[8], "linux ", 8);
2073 memcpy(&rbuf[16], "libata ", 16);
2074 memcpy(&rbuf[32], DRV_VERSION, 4);
2075 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2077 /* we don't store the ATA device signature, so we fake it */
2079 tf.command = ATA_DRDY; /* really, this is Status reg */
2083 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2084 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2086 rbuf[56] = ATA_CMD_ID_ATA;
2088 memcpy(&rbuf[60], &args->id[0], 512);
2092 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2096 if (ata_id_major_version(args->id) > 7) {
2097 rbuf[4] = args->id[217] >> 8;
2098 rbuf[5] = args->id[217];
2099 rbuf[7] = args->id[168] & 0xf;
2106 * ata_scsiop_noop - Command handler that simply returns success.
2107 * @args: device IDENTIFY data / SCSI command of interest.
2108 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2110 * No operation. Simply returns success to caller, to indicate
2111 * that the caller should successfully complete this SCSI command.
2114 * spin_lock_irqsave(host lock)
2116 static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2123 * ata_msense_caching - Simulate MODE SENSE caching info page
2124 * @id: device IDENTIFY data
2125 * @buf: output buffer
2127 * Generate a caching info page, which conditionally indicates
2128 * write caching to the SCSI layer, depending on device
2134 static unsigned int ata_msense_caching(u16 *id, u8 *buf)
2136 memcpy(buf, def_cache_mpage, sizeof(def_cache_mpage));
2137 if (ata_id_wcache_enabled(id))
2138 buf[2] |= (1 << 2); /* write cache enable */
2139 if (!ata_id_rahead_enabled(id))
2140 buf[12] |= (1 << 5); /* disable read ahead */
2141 return sizeof(def_cache_mpage);
2145 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2146 * @buf: output buffer
2148 * Generate a generic MODE SENSE control mode page.
2153 static unsigned int ata_msense_ctl_mode(u8 *buf)
2155 memcpy(buf, def_control_mpage, sizeof(def_control_mpage));
2156 return sizeof(def_control_mpage);
2160 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2161 * @buf: output buffer
2163 * Generate a generic MODE SENSE r/w error recovery page.
2168 static unsigned int ata_msense_rw_recovery(u8 *buf)
2170 memcpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage));
2171 return sizeof(def_rw_recovery_mpage);
2175 * We can turn this into a real blacklist if it's needed, for now just
2176 * blacklist any Maxtor BANC1G10 revision firmware
2178 static int ata_dev_supports_fua(u16 *id)
2180 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2184 if (!ata_id_has_fua(id))
2187 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2188 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2190 if (strcmp(model, "Maxtor"))
2192 if (strcmp(fw, "BANC1G10"))
2195 return 0; /* blacklisted */
2199 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2200 * @args: device IDENTIFY data / SCSI command of interest.
2201 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2203 * Simulate MODE SENSE commands. Assume this is invoked for direct
2204 * access devices (e.g. disks) only. There should be no block
2205 * descriptor for other device types.
2208 * spin_lock_irqsave(host lock)
2210 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2212 struct ata_device *dev = args->dev;
2213 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2214 const u8 sat_blk_desc[] = {
2215 0, 0, 0, 0, /* number of blocks: sat unspecified */
2217 0, 0x2, 0x0 /* block length: 512 bytes */
2220 unsigned int ebd, page_control, six_byte;
2225 six_byte = (scsicmd[0] == MODE_SENSE);
2226 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2228 * LLBA bit in msense(10) ignored (compliant)
2231 page_control = scsicmd[2] >> 6;
2232 switch (page_control) {
2233 case 0: /* current */
2234 break; /* supported */
2236 goto saving_not_supp;
2237 case 1: /* changeable */
2238 case 2: /* defaults */
2244 p += 4 + (ebd ? 8 : 0);
2246 p += 8 + (ebd ? 8 : 0);
2248 pg = scsicmd[2] & 0x3f;
2251 * No mode subpages supported (yet) but asking for _all_
2252 * subpages may be valid
2254 if (spg && (spg != ALL_SUB_MPAGES))
2258 case RW_RECOVERY_MPAGE:
2259 p += ata_msense_rw_recovery(p);
2263 p += ata_msense_caching(args->id, p);
2267 p += ata_msense_ctl_mode(p);
2271 p += ata_msense_rw_recovery(p);
2272 p += ata_msense_caching(args->id, p);
2273 p += ata_msense_ctl_mode(p);
2276 default: /* invalid page code */
2281 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2282 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2286 rbuf[0] = p - rbuf - 1;
2289 rbuf[3] = sizeof(sat_blk_desc);
2290 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2293 unsigned int output_len = p - rbuf - 2;
2295 rbuf[0] = output_len >> 8;
2296 rbuf[1] = output_len;
2299 rbuf[7] = sizeof(sat_blk_desc);
2300 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2306 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2307 /* "Invalid field in cbd" */
2311 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2312 /* "Saving parameters not supported" */
2317 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2318 * @args: device IDENTIFY data / SCSI command of interest.
2319 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2321 * Simulate READ CAPACITY commands.
2326 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2328 u64 last_lba = args->dev->n_sectors - 1; /* LBA of the last block */
2332 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2333 if (last_lba >= 0xffffffffULL)
2334 last_lba = 0xffffffff;
2336 /* sector count, 32-bit */
2337 rbuf[0] = last_lba >> (8 * 3);
2338 rbuf[1] = last_lba >> (8 * 2);
2339 rbuf[2] = last_lba >> (8 * 1);
2343 rbuf[6] = ATA_SECT_SIZE >> 8;
2344 rbuf[7] = ATA_SECT_SIZE & 0xff;
2346 /* sector count, 64-bit */
2347 rbuf[0] = last_lba >> (8 * 7);
2348 rbuf[1] = last_lba >> (8 * 6);
2349 rbuf[2] = last_lba >> (8 * 5);
2350 rbuf[3] = last_lba >> (8 * 4);
2351 rbuf[4] = last_lba >> (8 * 3);
2352 rbuf[5] = last_lba >> (8 * 2);
2353 rbuf[6] = last_lba >> (8 * 1);
2357 rbuf[10] = ATA_SECT_SIZE >> 8;
2358 rbuf[11] = ATA_SECT_SIZE & 0xff;
2365 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2366 * @args: device IDENTIFY data / SCSI command of interest.
2367 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2369 * Simulate REPORT LUNS command.
2372 * spin_lock_irqsave(host lock)
2374 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2377 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2382 static void atapi_sense_complete(struct ata_queued_cmd *qc)
2384 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2385 /* FIXME: not quite right; we don't want the
2386 * translation of taskfile registers into
2387 * a sense descriptors, since that's only
2388 * correct for ATA, not ATAPI
2390 ata_gen_passthru_sense(qc);
2393 qc->scsidone(qc->scsicmd);
2397 /* is it pointless to prefer PIO for "safety reasons"? */
2398 static inline int ata_pio_use_silly(struct ata_port *ap)
2400 return (ap->flags & ATA_FLAG_PIO_DMA);
2403 static void atapi_request_sense(struct ata_queued_cmd *qc)
2405 struct ata_port *ap = qc->ap;
2406 struct scsi_cmnd *cmd = qc->scsicmd;
2408 DPRINTK("ATAPI request sense\n");
2410 /* FIXME: is this needed? */
2411 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2413 #ifdef CONFIG_ATA_SFF
2414 if (ap->ops->sff_tf_read)
2415 ap->ops->sff_tf_read(ap, &qc->tf);
2418 /* fill these in, for the case where they are -not- overwritten */
2419 cmd->sense_buffer[0] = 0x70;
2420 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2424 /* setup sg table and init transfer direction */
2425 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2426 ata_sg_init(qc, &qc->sgent, 1);
2427 qc->dma_dir = DMA_FROM_DEVICE;
2429 memset(&qc->cdb, 0, qc->dev->cdb_len);
2430 qc->cdb[0] = REQUEST_SENSE;
2431 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2433 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2434 qc->tf.command = ATA_CMD_PACKET;
2436 if (ata_pio_use_silly(ap)) {
2437 qc->tf.protocol = ATAPI_PROT_DMA;
2438 qc->tf.feature |= ATAPI_PKT_DMA;
2440 qc->tf.protocol = ATAPI_PROT_PIO;
2441 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2444 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2446 qc->complete_fn = atapi_sense_complete;
2453 static void atapi_qc_complete(struct ata_queued_cmd *qc)
2455 struct scsi_cmnd *cmd = qc->scsicmd;
2456 unsigned int err_mask = qc->err_mask;
2458 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2460 /* handle completion from new EH */
2461 if (unlikely(qc->ap->ops->error_handler &&
2462 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2464 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2465 /* FIXME: not quite right; we don't want the
2466 * translation of taskfile registers into a
2467 * sense descriptors, since that's only
2468 * correct for ATA, not ATAPI
2470 ata_gen_passthru_sense(qc);
2473 /* SCSI EH automatically locks door if sdev->locked is
2474 * set. Sometimes door lock request continues to
2475 * fail, for example, when no media is present. This
2476 * creates a loop - SCSI EH issues door lock which
2477 * fails and gets invoked again to acquire sense data
2478 * for the failed command.
2480 * If door lock fails, always clear sdev->locked to
2481 * avoid this infinite loop.
2483 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL)
2484 qc->dev->sdev->locked = 0;
2486 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2492 /* successful completion or old EH failure path */
2493 if (unlikely(err_mask & AC_ERR_DEV)) {
2494 cmd->result = SAM_STAT_CHECK_CONDITION;
2495 atapi_request_sense(qc);
2497 } else if (unlikely(err_mask)) {
2498 /* FIXME: not quite right; we don't want the
2499 * translation of taskfile registers into
2500 * a sense descriptors, since that's only
2501 * correct for ATA, not ATAPI
2503 ata_gen_passthru_sense(qc);
2505 u8 *scsicmd = cmd->cmnd;
2507 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2508 unsigned long flags;
2511 buf = ata_scsi_rbuf_get(cmd, true, &flags);
2513 /* ATAPI devices typically report zero for their SCSI version,
2514 * and sometimes deviate from the spec WRT response data
2515 * format. If SCSI version is reported as zero like normal,
2516 * then we make the following fixups: 1) Fake MMC-5 version,
2517 * to indicate to the Linux scsi midlayer this is a modern
2518 * device. 2) Ensure response data format / ATAPI information
2519 * are always correct.
2526 ata_scsi_rbuf_put(cmd, true, &flags);
2529 cmd->result = SAM_STAT_GOOD;
2536 * atapi_xlat - Initialize PACKET taskfile
2537 * @qc: command structure to be initialized
2540 * spin_lock_irqsave(host lock)
2543 * Zero on success, non-zero on failure.
2545 static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2547 struct scsi_cmnd *scmd = qc->scsicmd;
2548 struct ata_device *dev = qc->dev;
2549 int nodata = (scmd->sc_data_direction == DMA_NONE);
2550 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2551 unsigned int nbytes;
2553 memset(qc->cdb, 0, dev->cdb_len);
2554 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2556 qc->complete_fn = atapi_qc_complete;
2558 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2559 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2560 qc->tf.flags |= ATA_TFLAG_WRITE;
2561 DPRINTK("direction: write\n");
2564 qc->tf.command = ATA_CMD_PACKET;
2565 ata_qc_set_pc_nbytes(qc);
2567 /* check whether ATAPI DMA is safe */
2568 if (!nodata && !using_pio && atapi_check_dma(qc))
2571 /* Some controller variants snoop this value for Packet
2572 * transfers to do state machine and FIFO management. Thus we
2573 * want to set it properly, and for DMA where it is
2574 * effectively meaningless.
2576 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2578 /* Most ATAPI devices which honor transfer chunk size don't
2579 * behave according to the spec when odd chunk size which
2580 * matches the transfer length is specified. If the number of
2581 * bytes to transfer is 2n+1. According to the spec, what
2582 * should happen is to indicate that 2n+1 is going to be
2583 * transferred and transfer 2n+2 bytes where the last byte is
2586 * In practice, this doesn't happen. ATAPI devices first
2587 * indicate and transfer 2n bytes and then indicate and
2588 * transfer 2 bytes where the last byte is padding.
2590 * This inconsistency confuses several controllers which
2591 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2592 * These controllers use actual number of transferred bytes to
2593 * update DMA poitner and transfer of 4n+2 bytes make those
2594 * controller push DMA pointer by 4n+4 bytes because SATA data
2595 * FISes are aligned to 4 bytes. This causes data corruption
2596 * and buffer overrun.
2598 * Always setting nbytes to even number solves this problem
2599 * because then ATAPI devices don't have to split data at 2n
2605 qc->tf.lbam = (nbytes & 0xFF);
2606 qc->tf.lbah = (nbytes >> 8);
2609 qc->tf.protocol = ATAPI_PROT_NODATA;
2611 qc->tf.protocol = ATAPI_PROT_PIO;
2614 qc->tf.protocol = ATAPI_PROT_DMA;
2615 qc->tf.feature |= ATAPI_PKT_DMA;
2617 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2618 (scmd->sc_data_direction != DMA_TO_DEVICE))
2619 /* some SATA bridges need us to indicate data xfer direction */
2620 qc->tf.feature |= ATAPI_DMADIR;
2624 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2625 as ATAPI tape drives don't get this right otherwise */
2629 static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2631 if (!sata_pmp_attached(ap)) {
2632 if (likely(devno < ata_link_max_devices(&ap->link)))
2633 return &ap->link.device[devno];
2635 if (likely(devno < ap->nr_pmp_links))
2636 return &ap->pmp_link[devno].device[0];
2642 static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2643 const struct scsi_device *scsidev)
2647 /* skip commands not addressed to targets we simulate */
2648 if (!sata_pmp_attached(ap)) {
2649 if (unlikely(scsidev->channel || scsidev->lun))
2651 devno = scsidev->id;
2653 if (unlikely(scsidev->id || scsidev->lun))
2655 devno = scsidev->channel;
2658 return ata_find_dev(ap, devno);
2662 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2663 * @ap: ATA port to which the device is attached
2664 * @scsidev: SCSI device from which we derive the ATA device
2666 * Given various information provided in struct scsi_cmnd,
2667 * map that onto an ATA bus, and using that mapping
2668 * determine which ata_device is associated with the
2669 * SCSI command to be sent.
2672 * spin_lock_irqsave(host lock)
2675 * Associated ATA device, or %NULL if not found.
2677 static struct ata_device *
2678 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2680 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2682 if (unlikely(!dev || !ata_dev_enabled(dev)))
2689 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2690 * @byte1: Byte 1 from pass-thru CDB.
2693 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2696 ata_scsi_map_proto(u8 byte1)
2698 switch((byte1 & 0x1e) >> 1) {
2699 case 3: /* Non-data */
2700 return ATA_PROT_NODATA;
2703 case 10: /* UDMA Data-in */
2704 case 11: /* UDMA Data-Out */
2705 return ATA_PROT_DMA;
2707 case 4: /* PIO Data-in */
2708 case 5: /* PIO Data-out */
2709 return ATA_PROT_PIO;
2711 case 0: /* Hard Reset */
2713 case 8: /* Device Diagnostic */
2714 case 9: /* Device Reset */
2715 case 7: /* DMA Queued */
2716 case 12: /* FPDMA */
2717 case 15: /* Return Response Info */
2718 default: /* Reserved */
2722 return ATA_PROT_UNKNOWN;
2726 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2727 * @qc: command structure to be initialized
2729 * Handles either 12 or 16-byte versions of the CDB.
2732 * Zero on success, non-zero on failure.
2734 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2736 struct ata_taskfile *tf = &(qc->tf);
2737 struct scsi_cmnd *scmd = qc->scsicmd;
2738 struct ata_device *dev = qc->dev;
2739 const u8 *cdb = scmd->cmnd;
2741 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2745 * Filter TPM commands by default. These provide an
2746 * essentially uncontrolled encrypted "back door" between
2747 * applications and the disk. Set libata.allow_tpm=1 if you
2748 * have a real reason for wanting to use them. This ensures
2749 * that installed software cannot easily mess stuff up without
2750 * user intent. DVR type users will probably ship with this enabled
2751 * for movie content management.
2753 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
2754 * for this and should do in future but that it is not sufficient as
2755 * DCS is an optional feature set. Thus we also do the software filter
2756 * so that we comply with the TC consortium stated goal that the user
2757 * can turn off TC features of their system.
2759 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
2762 /* We may not issue DMA commands if no DMA mode is set */
2763 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
2767 * 12 and 16 byte CDBs use different offsets to
2768 * provide the various register values.
2770 if (cdb[0] == ATA_16) {
2772 * 16-byte CDB - may contain extended commands.
2774 * If that is the case, copy the upper byte register values.
2776 if (cdb[1] & 0x01) {
2777 tf->hob_feature = cdb[3];
2778 tf->hob_nsect = cdb[5];
2779 tf->hob_lbal = cdb[7];
2780 tf->hob_lbam = cdb[9];
2781 tf->hob_lbah = cdb[11];
2782 tf->flags |= ATA_TFLAG_LBA48;
2784 tf->flags &= ~ATA_TFLAG_LBA48;
2787 * Always copy low byte, device and command registers.
2789 tf->feature = cdb[4];
2794 tf->device = cdb[13];
2795 tf->command = cdb[14];
2798 * 12-byte CDB - incapable of extended commands.
2800 tf->flags &= ~ATA_TFLAG_LBA48;
2802 tf->feature = cdb[3];
2807 tf->device = cdb[8];
2808 tf->command = cdb[9];
2811 /* enforce correct master/slave bit */
2812 tf->device = dev->devno ?
2813 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2815 /* sanity check for pio multi commands */
2816 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
2819 if (is_multi_taskfile(tf)) {
2820 unsigned int multi_count = 1 << (cdb[1] >> 5);
2822 /* compare the passed through multi_count
2823 * with the cached multi_count of libata
2825 if (multi_count != dev->multi_count)
2826 ata_dev_printk(dev, KERN_WARNING,
2827 "invalid multi_count %u ignored\n",
2831 /* READ/WRITE LONG use a non-standard sect_size */
2832 qc->sect_size = ATA_SECT_SIZE;
2833 switch (tf->command) {
2834 case ATA_CMD_READ_LONG:
2835 case ATA_CMD_READ_LONG_ONCE:
2836 case ATA_CMD_WRITE_LONG:
2837 case ATA_CMD_WRITE_LONG_ONCE:
2838 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
2840 qc->sect_size = scsi_bufflen(scmd);
2844 * Filter SET_FEATURES - XFER MODE command -- otherwise,
2845 * SET_FEATURES - XFER MODE must be preceded/succeeded
2846 * by an update to hardware-specific registers for each
2847 * controller (i.e. the reason for ->set_piomode(),
2848 * ->set_dmamode(), and ->post_set_mode() hooks).
2850 if ((tf->command == ATA_CMD_SET_FEATURES)
2851 && (tf->feature == SETFEATURES_XFER))
2855 * Set flags so that all registers will be written,
2856 * and pass on write indication (used for PIO/DMA
2859 tf->flags |= (ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE);
2861 if (scmd->sc_data_direction == DMA_TO_DEVICE)
2862 tf->flags |= ATA_TFLAG_WRITE;
2865 * Set transfer length.
2867 * TODO: find out if we need to do more here to
2868 * cover scatter/gather case.
2870 ata_qc_set_pc_nbytes(qc);
2872 /* request result TF and be quiet about device error */
2873 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
2878 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
2879 /* "Invalid field in cdb" */
2884 * ata_get_xlat_func - check if SCSI to ATA translation is possible
2886 * @cmd: SCSI command opcode to consider
2888 * Look up the SCSI command given, and determine whether the
2889 * SCSI command is to be translated or simulated.
2892 * Pointer to translation function if possible, %NULL if not.
2895 static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
2905 return ata_scsi_rw_xlat;
2907 case SYNCHRONIZE_CACHE:
2908 if (ata_try_flush_cache(dev))
2909 return ata_scsi_flush_xlat;
2914 return ata_scsi_verify_xlat;
2918 return ata_scsi_pass_thru;
2921 return ata_scsi_start_stop_xlat;
2928 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
2929 * @ap: ATA port to which the command was being sent
2930 * @cmd: SCSI command to dump
2932 * Prints the contents of a SCSI command via printk().
2935 static inline void ata_scsi_dump_cdb(struct ata_port *ap,
2936 struct scsi_cmnd *cmd)
2939 struct scsi_device *scsidev = cmd->device;
2940 u8 *scsicmd = cmd->cmnd;
2942 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
2944 scsidev->channel, scsidev->id, scsidev->lun,
2945 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
2946 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
2951 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
2952 void (*done)(struct scsi_cmnd *),
2953 struct ata_device *dev)
2955 u8 scsi_op = scmd->cmnd[0];
2956 ata_xlat_func_t xlat_func;
2959 if (dev->class == ATA_DEV_ATA) {
2960 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
2963 xlat_func = ata_get_xlat_func(dev, scsi_op);
2965 if (unlikely(!scmd->cmd_len))
2969 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
2970 /* relay SCSI command to ATAPI device */
2971 int len = COMMAND_SIZE(scsi_op);
2972 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
2975 xlat_func = atapi_xlat;
2977 /* ATA_16 passthru, treat as an ATA command */
2978 if (unlikely(scmd->cmd_len > 16))
2981 xlat_func = ata_get_xlat_func(dev, scsi_op);
2986 rc = ata_scsi_translate(dev, scmd, done, xlat_func);
2988 ata_scsi_simulate(dev, scmd, done);
2993 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
2994 scmd->cmd_len, scsi_op, dev->cdb_len);
2995 scmd->result = DID_ERROR << 16;
3001 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3002 * @cmd: SCSI command to be sent
3003 * @done: Completion function, called when command is complete
3005 * In some cases, this function translates SCSI commands into
3006 * ATA taskfiles, and queues the taskfiles to be sent to
3007 * hardware. In other cases, this function simulates a
3008 * SCSI device by evaluating and responding to certain
3009 * SCSI commands. This creates the overall effect of
3010 * ATA and ATAPI devices appearing as SCSI devices.
3013 * Releases scsi-layer-held lock, and obtains host lock.
3016 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3019 int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
3021 struct ata_port *ap;
3022 struct ata_device *dev;
3023 struct scsi_device *scsidev = cmd->device;
3024 struct Scsi_Host *shost = scsidev->host;
3027 ap = ata_shost_to_port(shost);
3029 spin_unlock(shost->host_lock);
3030 spin_lock(ap->lock);
3032 ata_scsi_dump_cdb(ap, cmd);
3034 dev = ata_scsi_find_dev(ap, scsidev);
3036 rc = __ata_scsi_queuecmd(cmd, done, dev);
3038 cmd->result = (DID_BAD_TARGET << 16);
3042 spin_unlock(ap->lock);
3043 spin_lock(shost->host_lock);
3048 * ata_scsi_simulate - simulate SCSI command on ATA device
3049 * @dev: the target device
3050 * @cmd: SCSI command being sent to device.
3051 * @done: SCSI command completion function.
3053 * Interprets and directly executes a select list of SCSI commands
3054 * that can be handled internally.
3057 * spin_lock_irqsave(host lock)
3060 void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
3061 void (*done)(struct scsi_cmnd *))
3063 struct ata_scsi_args args;
3064 const u8 *scsicmd = cmd->cmnd;
3072 switch(scsicmd[0]) {
3073 /* TODO: worth improving? */
3075 ata_scsi_invalid_field(cmd, done);
3079 if (scsicmd[1] & 2) /* is CmdDt set? */
3080 ata_scsi_invalid_field(cmd, done);
3081 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3082 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3083 else switch (scsicmd[2]) {
3085 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3088 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3091 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3094 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3097 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3100 ata_scsi_invalid_field(cmd, done);
3107 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3110 case MODE_SELECT: /* unconditionally return */
3111 case MODE_SELECT_10: /* bad-field-in-cdb */
3112 ata_scsi_invalid_field(cmd, done);
3116 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3119 case SERVICE_ACTION_IN:
3120 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3121 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3123 ata_scsi_invalid_field(cmd, done);
3127 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3131 ata_scsi_set_sense(cmd, 0, 0, 0);
3132 cmd->result = (DRIVER_SENSE << 24);
3136 /* if we reach this, then writeback caching is disabled,
3137 * turning this into a no-op.
3139 case SYNCHRONIZE_CACHE:
3142 /* no-op's, complete with success */
3146 case TEST_UNIT_READY:
3147 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3150 case SEND_DIAGNOSTIC:
3151 tmp8 = scsicmd[1] & ~(1 << 3);
3152 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3153 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3155 ata_scsi_invalid_field(cmd, done);
3158 /* all other commands */
3160 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3161 /* "Invalid command operation code" */
3167 int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3171 for (i = 0; i < host->n_ports; i++) {
3172 struct ata_port *ap = host->ports[i];
3173 struct Scsi_Host *shost;
3176 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3180 *(struct ata_port **)&shost->hostdata[0] = ap;
3181 ap->scsi_host = shost;
3183 shost->transportt = &ata_scsi_transport_template;
3184 shost->unique_id = ap->print_id;
3187 shost->max_channel = 1;
3188 shost->max_cmd_len = 16;
3190 /* Schedule policy is determined by ->qc_defer()
3191 * callback and it needs to see every deferred qc.
3192 * Set host_blocked to 1 to prevent SCSI midlayer from
3193 * automatically deferring requests.
3195 shost->max_host_blocked = 1;
3197 rc = scsi_add_host(ap->scsi_host, ap->host->dev);
3205 scsi_host_put(host->ports[i]->scsi_host);
3208 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3210 scsi_remove_host(shost);
3211 scsi_host_put(shost);
3216 void ata_scsi_scan_host(struct ata_port *ap, int sync)
3219 struct ata_device *last_failed_dev = NULL;
3220 struct ata_link *link;
3221 struct ata_device *dev;
3223 if (ap->flags & ATA_FLAG_DISABLED)
3227 ata_port_for_each_link(link, ap) {
3228 ata_link_for_each_dev(dev, link) {
3229 struct scsi_device *sdev;
3230 int channel = 0, id = 0;
3232 if (!ata_dev_enabled(dev) || dev->sdev)
3235 if (ata_is_host_link(link))
3238 channel = link->pmp;
3240 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3242 if (!IS_ERR(sdev)) {
3244 scsi_device_put(sdev);
3249 /* If we scanned while EH was in progress or allocation
3250 * failure occurred, scan would have failed silently. Check
3251 * whether all devices are attached.
3253 ata_port_for_each_link(link, ap) {
3254 ata_link_for_each_dev(dev, link) {
3255 if (ata_dev_enabled(dev) && !dev->sdev)
3263 /* we're missing some SCSI devices */
3265 /* If caller requested synchrnous scan && we've made
3266 * any progress, sleep briefly and repeat.
3268 if (dev != last_failed_dev) {
3270 last_failed_dev = dev;
3274 /* We might be failing to detect boot device, give it
3275 * a few more chances.
3282 ata_port_printk(ap, KERN_ERR, "WARNING: synchronous SCSI scan "
3283 "failed without making any progress,\n"
3284 " switching to async\n");
3287 queue_delayed_work(ata_aux_wq, &ap->hotplug_task,
3288 round_jiffies_relative(HZ));
3292 * ata_scsi_offline_dev - offline attached SCSI device
3293 * @dev: ATA device to offline attached SCSI device for
3295 * This function is called from ata_eh_hotplug() and responsible
3296 * for taking the SCSI device attached to @dev offline. This
3297 * function is called with host lock which protects dev->sdev
3301 * spin_lock_irqsave(host lock)
3304 * 1 if attached SCSI device exists, 0 otherwise.
3306 int ata_scsi_offline_dev(struct ata_device *dev)
3309 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3316 * ata_scsi_remove_dev - remove attached SCSI device
3317 * @dev: ATA device to remove attached SCSI device for
3319 * This function is called from ata_eh_scsi_hotplug() and
3320 * responsible for removing the SCSI device attached to @dev.
3323 * Kernel thread context (may sleep).
3325 static void ata_scsi_remove_dev(struct ata_device *dev)
3327 struct ata_port *ap = dev->link->ap;
3328 struct scsi_device *sdev;
3329 unsigned long flags;
3331 /* Alas, we need to grab scan_mutex to ensure SCSI device
3332 * state doesn't change underneath us and thus
3333 * scsi_device_get() always succeeds. The mutex locking can
3334 * be removed if there is __scsi_device_get() interface which
3335 * increments reference counts regardless of device state.
3337 mutex_lock(&ap->scsi_host->scan_mutex);
3338 spin_lock_irqsave(ap->lock, flags);
3340 /* clearing dev->sdev is protected by host lock */
3345 /* If user initiated unplug races with us, sdev can go
3346 * away underneath us after the host lock and
3347 * scan_mutex are released. Hold onto it.
3349 if (scsi_device_get(sdev) == 0) {
3350 /* The following ensures the attached sdev is
3351 * offline on return from ata_scsi_offline_dev()
3352 * regardless it wins or loses the race
3353 * against this function.
3355 scsi_device_set_state(sdev, SDEV_OFFLINE);
3362 spin_unlock_irqrestore(ap->lock, flags);
3363 mutex_unlock(&ap->scsi_host->scan_mutex);
3366 ata_dev_printk(dev, KERN_INFO, "detaching (SCSI %s)\n",
3367 sdev->sdev_gendev.bus_id);
3369 scsi_remove_device(sdev);
3370 scsi_device_put(sdev);
3374 static void ata_scsi_handle_link_detach(struct ata_link *link)
3376 struct ata_port *ap = link->ap;
3377 struct ata_device *dev;
3379 ata_link_for_each_dev(dev, link) {
3380 unsigned long flags;
3382 if (!(dev->flags & ATA_DFLAG_DETACHED))
3385 spin_lock_irqsave(ap->lock, flags);
3386 dev->flags &= ~ATA_DFLAG_DETACHED;
3387 spin_unlock_irqrestore(ap->lock, flags);
3389 ata_scsi_remove_dev(dev);
3394 * ata_scsi_media_change_notify - send media change event
3395 * @dev: Pointer to the disk device with media change event
3397 * Tell the block layer to send a media change notification
3401 * spin_lock_irqsave(host lock)
3403 void ata_scsi_media_change_notify(struct ata_device *dev)
3406 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3411 * ata_scsi_hotplug - SCSI part of hotplug
3412 * @work: Pointer to ATA port to perform SCSI hotplug on
3414 * Perform SCSI part of hotplug. It's executed from a separate
3415 * workqueue after EH completes. This is necessary because SCSI
3416 * hot plugging requires working EH and hot unplugging is
3417 * synchronized with hot plugging with a mutex.
3420 * Kernel thread context (may sleep).
3422 void ata_scsi_hotplug(struct work_struct *work)
3424 struct ata_port *ap =
3425 container_of(work, struct ata_port, hotplug_task.work);
3428 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3429 DPRINTK("ENTER/EXIT - unloading\n");
3435 /* Unplug detached devices. We cannot use link iterator here
3436 * because PMP links have to be scanned even if PMP is
3437 * currently not attached. Iterate manually.
3439 ata_scsi_handle_link_detach(&ap->link);
3441 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3442 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3444 /* scan for new ones */
3445 ata_scsi_scan_host(ap, 0);
3451 * ata_scsi_user_scan - indication for user-initiated bus scan
3452 * @shost: SCSI host to scan
3453 * @channel: Channel to scan
3457 * This function is called when user explicitly requests bus
3458 * scan. Set probe pending flag and invoke EH.
3461 * SCSI layer (we don't care)
3466 static int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3467 unsigned int id, unsigned int lun)
3469 struct ata_port *ap = ata_shost_to_port(shost);
3470 unsigned long flags;
3473 if (!ap->ops->error_handler)
3476 if (lun != SCAN_WILD_CARD && lun)
3479 if (!sata_pmp_attached(ap)) {
3480 if (channel != SCAN_WILD_CARD && channel)
3484 if (id != SCAN_WILD_CARD && id)
3489 spin_lock_irqsave(ap->lock, flags);
3491 if (devno == SCAN_WILD_CARD) {
3492 struct ata_link *link;
3494 ata_port_for_each_link(link, ap) {
3495 struct ata_eh_info *ehi = &link->eh_info;
3496 ehi->probe_mask |= ATA_ALL_DEVICES;
3497 ehi->action |= ATA_EH_RESET;
3500 struct ata_device *dev = ata_find_dev(ap, devno);
3503 struct ata_eh_info *ehi = &dev->link->eh_info;
3504 ehi->probe_mask |= 1 << dev->devno;
3505 ehi->action |= ATA_EH_RESET;
3511 ata_port_schedule_eh(ap);
3512 spin_unlock_irqrestore(ap->lock, flags);
3513 ata_port_wait_eh(ap);
3515 spin_unlock_irqrestore(ap->lock, flags);
3521 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3522 * @work: Pointer to ATA port to perform scsi_rescan_device()
3524 * After ATA pass thru (SAT) commands are executed successfully,
3525 * libata need to propagate the changes to SCSI layer. This
3526 * function must be executed from ata_aux_wq such that sdev
3527 * attach/detach don't race with rescan.
3530 * Kernel thread context (may sleep).
3532 void ata_scsi_dev_rescan(struct work_struct *work)
3534 struct ata_port *ap =
3535 container_of(work, struct ata_port, scsi_rescan_task);
3536 struct ata_link *link;
3537 struct ata_device *dev;
3538 unsigned long flags;
3540 spin_lock_irqsave(ap->lock, flags);
3542 ata_port_for_each_link(link, ap) {
3543 ata_link_for_each_dev(dev, link) {
3544 struct scsi_device *sdev = dev->sdev;
3546 if (!ata_dev_enabled(dev) || !sdev)
3548 if (scsi_device_get(sdev))
3551 spin_unlock_irqrestore(ap->lock, flags);
3552 scsi_rescan_device(&(sdev->sdev_gendev));
3553 scsi_device_put(sdev);
3554 spin_lock_irqsave(ap->lock, flags);
3558 spin_unlock_irqrestore(ap->lock, flags);
3562 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
3563 * @host: ATA host container for all SAS ports
3564 * @port_info: Information from low-level host driver
3565 * @shost: SCSI host that the scsi device is attached to
3568 * PCI/etc. bus probe sem.
3571 * ata_port pointer on success / NULL on failure.
3574 struct ata_port *ata_sas_port_alloc(struct ata_host *host,
3575 struct ata_port_info *port_info,
3576 struct Scsi_Host *shost)
3578 struct ata_port *ap;
3580 ap = ata_port_alloc(host);
3585 ap->lock = shost->host_lock;
3586 ap->pio_mask = port_info->pio_mask;
3587 ap->mwdma_mask = port_info->mwdma_mask;
3588 ap->udma_mask = port_info->udma_mask;
3589 ap->flags |= port_info->flags;
3590 ap->ops = port_info->port_ops;
3591 ap->cbl = ATA_CBL_SATA;
3595 EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
3598 * ata_sas_port_start - Set port up for dma.
3599 * @ap: Port to initialize
3601 * Called just after data structures for each port are
3604 * May be used as the port_start() entry in ata_port_operations.
3607 * Inherited from caller.
3609 int ata_sas_port_start(struct ata_port *ap)
3613 EXPORT_SYMBOL_GPL(ata_sas_port_start);
3616 * ata_port_stop - Undo ata_sas_port_start()
3617 * @ap: Port to shut down
3619 * May be used as the port_stop() entry in ata_port_operations.
3622 * Inherited from caller.
3625 void ata_sas_port_stop(struct ata_port *ap)
3628 EXPORT_SYMBOL_GPL(ata_sas_port_stop);
3631 * ata_sas_port_init - Initialize a SATA device
3632 * @ap: SATA port to initialize
3635 * PCI/etc. bus probe sem.
3638 * Zero on success, non-zero on error.
3641 int ata_sas_port_init(struct ata_port *ap)
3643 int rc = ap->ops->port_start(ap);
3646 ap->print_id = ata_print_id++;
3647 rc = ata_bus_probe(ap);
3652 EXPORT_SYMBOL_GPL(ata_sas_port_init);
3655 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
3656 * @ap: SATA port to destroy
3660 void ata_sas_port_destroy(struct ata_port *ap)
3662 if (ap->ops->port_stop)
3663 ap->ops->port_stop(ap);
3666 EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
3669 * ata_sas_slave_configure - Default slave_config routine for libata devices
3670 * @sdev: SCSI device to configure
3671 * @ap: ATA port to which SCSI device is attached
3677 int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
3679 ata_scsi_sdev_config(sdev);
3680 ata_scsi_dev_config(sdev, ap->link.device);
3683 EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
3686 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
3687 * @cmd: SCSI command to be sent
3688 * @done: Completion function, called when command is complete
3689 * @ap: ATA port to which the command is being sent
3692 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3696 int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
3697 struct ata_port *ap)
3701 ata_scsi_dump_cdb(ap, cmd);
3703 if (likely(ata_dev_enabled(ap->link.device)))
3704 rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
3706 cmd->result = (DID_BAD_TARGET << 16);
3711 EXPORT_SYMBOL_GPL(ata_sas_queuecmd);