2 * libata-scsi.c - helper library for ATA
4 * Maintained by: Tejun Heo <tj@kernel.org>
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/slab.h>
37 #include <linux/kernel.h>
38 #include <linux/blkdev.h>
39 #include <linux/spinlock.h>
40 #include <linux/export.h>
41 #include <scsi/scsi.h>
42 #include <scsi/scsi_host.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_eh.h>
45 #include <scsi/scsi_device.h>
46 #include <scsi/scsi_tcq.h>
47 #include <scsi/scsi_transport.h>
48 #include <linux/libata.h>
49 #include <linux/hdreg.h>
50 #include <linux/uaccess.h>
51 #include <linux/suspend.h>
52 #include <linux/pm_qos.h>
53 #include <asm/unaligned.h>
56 #include "libata-transport.h"
58 #define ATA_SCSI_RBUF_SIZE 4096
60 static DEFINE_SPINLOCK(ata_scsi_rbuf_lock
);
61 static u8 ata_scsi_rbuf
[ATA_SCSI_RBUF_SIZE
];
63 typedef unsigned int (*ata_xlat_func_t
)(struct ata_queued_cmd
*qc
);
65 static struct ata_device
*__ata_scsi_find_dev(struct ata_port
*ap
,
66 const struct scsi_device
*scsidev
);
67 static struct ata_device
*ata_scsi_find_dev(struct ata_port
*ap
,
68 const struct scsi_device
*scsidev
);
70 #define RW_RECOVERY_MPAGE 0x1
71 #define RW_RECOVERY_MPAGE_LEN 12
72 #define CACHE_MPAGE 0x8
73 #define CACHE_MPAGE_LEN 20
74 #define CONTROL_MPAGE 0xa
75 #define CONTROL_MPAGE_LEN 12
76 #define ALL_MPAGES 0x3f
77 #define ALL_SUB_MPAGES 0xff
80 static const u8 def_rw_recovery_mpage
[RW_RECOVERY_MPAGE_LEN
] = {
82 RW_RECOVERY_MPAGE_LEN
- 2,
84 0, /* read retry count */
86 0, /* write retry count */
90 static const u8 def_cache_mpage
[CACHE_MPAGE_LEN
] = {
93 0, /* contains WCE, needs to be 0 for logic */
94 0, 0, 0, 0, 0, 0, 0, 0, 0,
95 0, /* contains DRA, needs to be 0 for logic */
99 static const u8 def_control_mpage
[CONTROL_MPAGE_LEN
] = {
101 CONTROL_MPAGE_LEN
- 2,
102 2, /* DSENSE=0, GLTSD=1 */
103 0, /* [QAM+QERR may be 1, see 05-359r1] */
104 0, 0, 0, 0, 0xff, 0xff,
105 0, 30 /* extended self test time, see 05-359r1 */
108 static const char *ata_lpm_policy_names
[] = {
109 [ATA_LPM_UNKNOWN
] = "max_performance",
110 [ATA_LPM_MAX_POWER
] = "max_performance",
111 [ATA_LPM_MED_POWER
] = "medium_power",
112 [ATA_LPM_MIN_POWER
] = "min_power",
115 static ssize_t
ata_scsi_lpm_store(struct device
*device
,
116 struct device_attribute
*attr
,
117 const char *buf
, size_t count
)
119 struct Scsi_Host
*shost
= class_to_shost(device
);
120 struct ata_port
*ap
= ata_shost_to_port(shost
);
121 struct ata_link
*link
;
122 struct ata_device
*dev
;
123 enum ata_lpm_policy policy
;
126 /* UNKNOWN is internal state, iterate from MAX_POWER */
127 for (policy
= ATA_LPM_MAX_POWER
;
128 policy
< ARRAY_SIZE(ata_lpm_policy_names
); policy
++) {
129 const char *name
= ata_lpm_policy_names
[policy
];
131 if (strncmp(name
, buf
, strlen(name
)) == 0)
134 if (policy
== ARRAY_SIZE(ata_lpm_policy_names
))
137 spin_lock_irqsave(ap
->lock
, flags
);
139 ata_for_each_link(link
, ap
, EDGE
) {
140 ata_for_each_dev(dev
, &ap
->link
, ENABLED
) {
141 if (dev
->horkage
& ATA_HORKAGE_NOLPM
) {
148 ap
->target_lpm_policy
= policy
;
149 ata_port_schedule_eh(ap
);
151 spin_unlock_irqrestore(ap
->lock
, flags
);
155 static ssize_t
ata_scsi_lpm_show(struct device
*dev
,
156 struct device_attribute
*attr
, char *buf
)
158 struct Scsi_Host
*shost
= class_to_shost(dev
);
159 struct ata_port
*ap
= ata_shost_to_port(shost
);
161 if (ap
->target_lpm_policy
>= ARRAY_SIZE(ata_lpm_policy_names
))
164 return snprintf(buf
, PAGE_SIZE
, "%s\n",
165 ata_lpm_policy_names
[ap
->target_lpm_policy
]);
167 DEVICE_ATTR(link_power_management_policy
, S_IRUGO
| S_IWUSR
,
168 ata_scsi_lpm_show
, ata_scsi_lpm_store
);
169 EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy
);
171 static ssize_t
ata_scsi_park_show(struct device
*device
,
172 struct device_attribute
*attr
, char *buf
)
174 struct scsi_device
*sdev
= to_scsi_device(device
);
176 struct ata_link
*link
;
177 struct ata_device
*dev
;
178 unsigned long flags
, now
;
179 unsigned int uninitialized_var(msecs
);
182 ap
= ata_shost_to_port(sdev
->host
);
184 spin_lock_irqsave(ap
->lock
, flags
);
185 dev
= ata_scsi_find_dev(ap
, sdev
);
190 if (dev
->flags
& ATA_DFLAG_NO_UNLOAD
) {
197 if (ap
->pflags
& ATA_PFLAG_EH_IN_PROGRESS
&&
198 link
->eh_context
.unloaded_mask
& (1 << dev
->devno
) &&
199 time_after(dev
->unpark_deadline
, now
))
200 msecs
= jiffies_to_msecs(dev
->unpark_deadline
- now
);
205 spin_unlock_irq(ap
->lock
);
207 return rc
? rc
: snprintf(buf
, 20, "%u\n", msecs
);
210 static ssize_t
ata_scsi_park_store(struct device
*device
,
211 struct device_attribute
*attr
,
212 const char *buf
, size_t len
)
214 struct scsi_device
*sdev
= to_scsi_device(device
);
216 struct ata_device
*dev
;
221 rc
= strict_strtol(buf
, 10, &input
);
222 if (rc
|| input
< -2)
224 if (input
> ATA_TMOUT_MAX_PARK
) {
226 input
= ATA_TMOUT_MAX_PARK
;
229 ap
= ata_shost_to_port(sdev
->host
);
231 spin_lock_irqsave(ap
->lock
, flags
);
232 dev
= ata_scsi_find_dev(ap
, sdev
);
233 if (unlikely(!dev
)) {
237 if (dev
->class != ATA_DEV_ATA
) {
243 if (dev
->flags
& ATA_DFLAG_NO_UNLOAD
) {
248 dev
->unpark_deadline
= ata_deadline(jiffies
, input
);
249 dev
->link
->eh_info
.dev_action
[dev
->devno
] |= ATA_EH_PARK
;
250 ata_port_schedule_eh(ap
);
251 complete(&ap
->park_req_pending
);
255 dev
->flags
&= ~ATA_DFLAG_NO_UNLOAD
;
258 dev
->flags
|= ATA_DFLAG_NO_UNLOAD
;
263 spin_unlock_irqrestore(ap
->lock
, flags
);
265 return rc
? rc
: len
;
267 DEVICE_ATTR(unload_heads
, S_IRUGO
| S_IWUSR
,
268 ata_scsi_park_show
, ata_scsi_park_store
);
269 EXPORT_SYMBOL_GPL(dev_attr_unload_heads
);
271 static void ata_scsi_set_sense(struct scsi_cmnd
*cmd
, u8 sk
, u8 asc
, u8 ascq
)
273 cmd
->result
= (DRIVER_SENSE
<< 24) | SAM_STAT_CHECK_CONDITION
;
275 scsi_build_sense_buffer(0, cmd
->sense_buffer
, sk
, asc
, ascq
);
279 ata_scsi_em_message_store(struct device
*dev
, struct device_attribute
*attr
,
280 const char *buf
, size_t count
)
282 struct Scsi_Host
*shost
= class_to_shost(dev
);
283 struct ata_port
*ap
= ata_shost_to_port(shost
);
284 if (ap
->ops
->em_store
&& (ap
->flags
& ATA_FLAG_EM
))
285 return ap
->ops
->em_store(ap
, buf
, count
);
290 ata_scsi_em_message_show(struct device
*dev
, struct device_attribute
*attr
,
293 struct Scsi_Host
*shost
= class_to_shost(dev
);
294 struct ata_port
*ap
= ata_shost_to_port(shost
);
296 if (ap
->ops
->em_show
&& (ap
->flags
& ATA_FLAG_EM
))
297 return ap
->ops
->em_show(ap
, buf
);
300 DEVICE_ATTR(em_message
, S_IRUGO
| S_IWUSR
,
301 ata_scsi_em_message_show
, ata_scsi_em_message_store
);
302 EXPORT_SYMBOL_GPL(dev_attr_em_message
);
305 ata_scsi_em_message_type_show(struct device
*dev
, struct device_attribute
*attr
,
308 struct Scsi_Host
*shost
= class_to_shost(dev
);
309 struct ata_port
*ap
= ata_shost_to_port(shost
);
311 return snprintf(buf
, 23, "%d\n", ap
->em_message_type
);
313 DEVICE_ATTR(em_message_type
, S_IRUGO
,
314 ata_scsi_em_message_type_show
, NULL
);
315 EXPORT_SYMBOL_GPL(dev_attr_em_message_type
);
318 ata_scsi_activity_show(struct device
*dev
, struct device_attribute
*attr
,
321 struct scsi_device
*sdev
= to_scsi_device(dev
);
322 struct ata_port
*ap
= ata_shost_to_port(sdev
->host
);
323 struct ata_device
*atadev
= ata_scsi_find_dev(ap
, sdev
);
325 if (atadev
&& ap
->ops
->sw_activity_show
&&
326 (ap
->flags
& ATA_FLAG_SW_ACTIVITY
))
327 return ap
->ops
->sw_activity_show(atadev
, buf
);
332 ata_scsi_activity_store(struct device
*dev
, struct device_attribute
*attr
,
333 const char *buf
, size_t count
)
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
);
338 enum sw_activity val
;
341 if (atadev
&& ap
->ops
->sw_activity_store
&&
342 (ap
->flags
& ATA_FLAG_SW_ACTIVITY
)) {
343 val
= simple_strtoul(buf
, NULL
, 0);
345 case OFF
: case BLINK_ON
: case BLINK_OFF
:
346 rc
= ap
->ops
->sw_activity_store(atadev
, val
);
355 DEVICE_ATTR(sw_activity
, S_IWUSR
| S_IRUGO
, ata_scsi_activity_show
,
356 ata_scsi_activity_store
);
357 EXPORT_SYMBOL_GPL(dev_attr_sw_activity
);
359 struct device_attribute
*ata_common_sdev_attrs
[] = {
360 &dev_attr_unload_heads
,
363 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs
);
365 static void ata_scsi_invalid_field(struct scsi_cmnd
*cmd
)
367 ata_scsi_set_sense(cmd
, ILLEGAL_REQUEST
, 0x24, 0x0);
368 /* "Invalid field in cbd" */
373 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
374 * @sdev: SCSI device for which BIOS geometry is to be determined
375 * @bdev: block device associated with @sdev
376 * @capacity: capacity of SCSI device
377 * @geom: location to which geometry will be output
379 * Generic bios head/sector/cylinder calculator
380 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
381 * mapping. Some situations may arise where the disk is not
382 * bootable if this is not used.
385 * Defined by the SCSI layer. We don't really care.
390 int ata_std_bios_param(struct scsi_device
*sdev
, struct block_device
*bdev
,
391 sector_t capacity
, int geom
[])
395 sector_div(capacity
, 255*63);
402 * ata_scsi_unlock_native_capacity - unlock native capacity
403 * @sdev: SCSI device to adjust device capacity for
405 * This function is called if a partition on @sdev extends beyond
406 * the end of the device. It requests EH to unlock HPA.
409 * Defined by the SCSI layer. Might sleep.
411 void ata_scsi_unlock_native_capacity(struct scsi_device
*sdev
)
413 struct ata_port
*ap
= ata_shost_to_port(sdev
->host
);
414 struct ata_device
*dev
;
417 spin_lock_irqsave(ap
->lock
, flags
);
419 dev
= ata_scsi_find_dev(ap
, sdev
);
420 if (dev
&& dev
->n_sectors
< dev
->n_native_sectors
) {
421 dev
->flags
|= ATA_DFLAG_UNLOCK_HPA
;
422 dev
->link
->eh_info
.action
|= ATA_EH_RESET
;
423 ata_port_schedule_eh(ap
);
426 spin_unlock_irqrestore(ap
->lock
, flags
);
427 ata_port_wait_eh(ap
);
431 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
433 * @sdev: SCSI device to get identify data for
434 * @arg: User buffer area for identify data
437 * Defined by the SCSI layer. We don't really care.
440 * Zero on success, negative errno on error.
442 static int ata_get_identity(struct ata_port
*ap
, struct scsi_device
*sdev
,
445 struct ata_device
*dev
= ata_scsi_find_dev(ap
, sdev
);
446 u16 __user
*dst
= arg
;
452 if (copy_to_user(dst
, dev
->id
, ATA_ID_WORDS
* sizeof(u16
)))
455 ata_id_string(dev
->id
, buf
, ATA_ID_PROD
, ATA_ID_PROD_LEN
);
456 if (copy_to_user(dst
+ ATA_ID_PROD
, buf
, ATA_ID_PROD_LEN
))
459 ata_id_string(dev
->id
, buf
, ATA_ID_FW_REV
, ATA_ID_FW_REV_LEN
);
460 if (copy_to_user(dst
+ ATA_ID_FW_REV
, buf
, ATA_ID_FW_REV_LEN
))
463 ata_id_string(dev
->id
, buf
, ATA_ID_SERNO
, ATA_ID_SERNO_LEN
);
464 if (copy_to_user(dst
+ ATA_ID_SERNO
, buf
, ATA_ID_SERNO_LEN
))
471 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
472 * @scsidev: Device to which we are issuing command
473 * @arg: User provided data for issuing command
476 * Defined by the SCSI layer. We don't really care.
479 * Zero on success, negative errno on error.
481 int ata_cmd_ioctl(struct scsi_device
*scsidev
, void __user
*arg
)
484 u8 scsi_cmd
[MAX_COMMAND_SIZE
];
485 u8 args
[4], *argbuf
= NULL
, *sensebuf
= NULL
;
487 enum dma_data_direction data_dir
;
493 if (copy_from_user(args
, arg
, sizeof(args
)))
496 sensebuf
= kzalloc(SCSI_SENSE_BUFFERSIZE
, GFP_NOIO
);
500 memset(scsi_cmd
, 0, sizeof(scsi_cmd
));
503 argsize
= ATA_SECT_SIZE
* args
[3];
504 argbuf
= kmalloc(argsize
, GFP_KERNEL
);
505 if (argbuf
== NULL
) {
510 scsi_cmd
[1] = (4 << 1); /* PIO Data-in */
511 scsi_cmd
[2] = 0x0e; /* no off.line or cc, read from dev,
512 block count in sector count field */
513 data_dir
= DMA_FROM_DEVICE
;
515 scsi_cmd
[1] = (3 << 1); /* Non-data */
516 scsi_cmd
[2] = 0x20; /* cc but no off.line or data xfer */
520 scsi_cmd
[0] = ATA_16
;
522 scsi_cmd
[4] = args
[2];
523 if (args
[0] == ATA_CMD_SMART
) { /* hack -- ide driver does this too */
524 scsi_cmd
[6] = args
[3];
525 scsi_cmd
[8] = args
[1];
529 scsi_cmd
[6] = args
[1];
531 scsi_cmd
[14] = args
[0];
533 /* Good values for timeout and retries? Values below
534 from scsi_ioctl_send_command() for default case... */
535 cmd_result
= scsi_execute(scsidev
, scsi_cmd
, data_dir
, argbuf
, argsize
,
536 sensebuf
, (10*HZ
), 5, 0, NULL
);
538 if (driver_byte(cmd_result
) == DRIVER_SENSE
) {/* sense data available */
539 u8
*desc
= sensebuf
+ 8;
540 cmd_result
&= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
542 /* If we set cc then ATA pass-through will cause a
543 * check condition even if no error. Filter that. */
544 if (cmd_result
& SAM_STAT_CHECK_CONDITION
) {
545 struct scsi_sense_hdr sshdr
;
546 scsi_normalize_sense(sensebuf
, SCSI_SENSE_BUFFERSIZE
,
548 if (sshdr
.sense_key
== RECOVERED_ERROR
&&
549 sshdr
.asc
== 0 && sshdr
.ascq
== 0x1d)
550 cmd_result
&= ~SAM_STAT_CHECK_CONDITION
;
553 /* Send userspace a few ATA registers (same as drivers/ide) */
554 if (sensebuf
[0] == 0x72 && /* format is "descriptor" */
555 desc
[0] == 0x09) { /* code is "ATA Descriptor" */
556 args
[0] = desc
[13]; /* status */
557 args
[1] = desc
[3]; /* error */
558 args
[2] = desc
[5]; /* sector count (0:7) */
559 if (copy_to_user(arg
, args
, sizeof(args
)))
571 && copy_to_user(arg
+ sizeof(args
), argbuf
, argsize
))
580 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
581 * @scsidev: Device to which we are issuing command
582 * @arg: User provided data for issuing command
585 * Defined by the SCSI layer. We don't really care.
588 * Zero on success, negative errno on error.
590 int ata_task_ioctl(struct scsi_device
*scsidev
, void __user
*arg
)
593 u8 scsi_cmd
[MAX_COMMAND_SIZE
];
594 u8 args
[7], *sensebuf
= NULL
;
600 if (copy_from_user(args
, arg
, sizeof(args
)))
603 sensebuf
= kzalloc(SCSI_SENSE_BUFFERSIZE
, GFP_NOIO
);
607 memset(scsi_cmd
, 0, sizeof(scsi_cmd
));
608 scsi_cmd
[0] = ATA_16
;
609 scsi_cmd
[1] = (3 << 1); /* Non-data */
610 scsi_cmd
[2] = 0x20; /* cc but no off.line or data xfer */
611 scsi_cmd
[4] = args
[1];
612 scsi_cmd
[6] = args
[2];
613 scsi_cmd
[8] = args
[3];
614 scsi_cmd
[10] = args
[4];
615 scsi_cmd
[12] = args
[5];
616 scsi_cmd
[13] = args
[6] & 0x4f;
617 scsi_cmd
[14] = args
[0];
619 /* Good values for timeout and retries? Values below
620 from scsi_ioctl_send_command() for default case... */
621 cmd_result
= scsi_execute(scsidev
, scsi_cmd
, DMA_NONE
, NULL
, 0,
622 sensebuf
, (10*HZ
), 5, 0, NULL
);
624 if (driver_byte(cmd_result
) == DRIVER_SENSE
) {/* sense data available */
625 u8
*desc
= sensebuf
+ 8;
626 cmd_result
&= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
628 /* If we set cc then ATA pass-through will cause a
629 * check condition even if no error. Filter that. */
630 if (cmd_result
& SAM_STAT_CHECK_CONDITION
) {
631 struct scsi_sense_hdr sshdr
;
632 scsi_normalize_sense(sensebuf
, SCSI_SENSE_BUFFERSIZE
,
634 if (sshdr
.sense_key
== RECOVERED_ERROR
&&
635 sshdr
.asc
== 0 && sshdr
.ascq
== 0x1d)
636 cmd_result
&= ~SAM_STAT_CHECK_CONDITION
;
639 /* Send userspace ATA registers */
640 if (sensebuf
[0] == 0x72 && /* format is "descriptor" */
641 desc
[0] == 0x09) {/* code is "ATA Descriptor" */
642 args
[0] = desc
[13]; /* status */
643 args
[1] = desc
[3]; /* error */
644 args
[2] = desc
[5]; /* sector count (0:7) */
645 args
[3] = desc
[7]; /* lbal */
646 args
[4] = desc
[9]; /* lbam */
647 args
[5] = desc
[11]; /* lbah */
648 args
[6] = desc
[12]; /* select */
649 if (copy_to_user(arg
, args
, sizeof(args
)))
664 static int ata_ioc32(struct ata_port
*ap
)
666 if (ap
->flags
& ATA_FLAG_PIO_DMA
)
668 if (ap
->pflags
& ATA_PFLAG_PIO32
)
673 int ata_sas_scsi_ioctl(struct ata_port
*ap
, struct scsi_device
*scsidev
,
674 int cmd
, void __user
*arg
)
676 int val
= -EINVAL
, rc
= -EINVAL
;
680 case ATA_IOC_GET_IO32
:
681 spin_lock_irqsave(ap
->lock
, flags
);
683 spin_unlock_irqrestore(ap
->lock
, flags
);
684 if (copy_to_user(arg
, &val
, 1))
688 case ATA_IOC_SET_IO32
:
689 val
= (unsigned long) arg
;
691 spin_lock_irqsave(ap
->lock
, flags
);
692 if (ap
->pflags
& ATA_PFLAG_PIO32CHANGE
) {
694 ap
->pflags
|= ATA_PFLAG_PIO32
;
696 ap
->pflags
&= ~ATA_PFLAG_PIO32
;
698 if (val
!= ata_ioc32(ap
))
701 spin_unlock_irqrestore(ap
->lock
, flags
);
704 case HDIO_GET_IDENTITY
:
705 return ata_get_identity(ap
, scsidev
, arg
);
708 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
710 return ata_cmd_ioctl(scsidev
, arg
);
712 case HDIO_DRIVE_TASK
:
713 if (!capable(CAP_SYS_ADMIN
) || !capable(CAP_SYS_RAWIO
))
715 return ata_task_ioctl(scsidev
, arg
);
724 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl
);
726 int ata_scsi_ioctl(struct scsi_device
*scsidev
, int cmd
, void __user
*arg
)
728 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev
->host
),
731 EXPORT_SYMBOL_GPL(ata_scsi_ioctl
);
734 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
735 * @dev: ATA device to which the new command is attached
736 * @cmd: SCSI command that originated this ATA command
738 * Obtain a reference to an unused ata_queued_cmd structure,
739 * which is the basic libata structure representing a single
740 * ATA command sent to the hardware.
742 * If a command was available, fill in the SCSI-specific
743 * portions of the structure with information on the
747 * spin_lock_irqsave(host lock)
750 * Command allocated, or %NULL if none available.
752 static struct ata_queued_cmd
*ata_scsi_qc_new(struct ata_device
*dev
,
753 struct scsi_cmnd
*cmd
)
755 struct ata_queued_cmd
*qc
;
757 qc
= ata_qc_new_init(dev
);
760 qc
->scsidone
= cmd
->scsi_done
;
762 qc
->sg
= scsi_sglist(cmd
);
763 qc
->n_elem
= scsi_sg_count(cmd
);
765 cmd
->result
= (DID_OK
<< 16) | (QUEUE_FULL
<< 1);
772 static void ata_qc_set_pc_nbytes(struct ata_queued_cmd
*qc
)
774 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
776 qc
->extrabytes
= scmd
->request
->extra_len
;
777 qc
->nbytes
= scsi_bufflen(scmd
) + qc
->extrabytes
;
781 * ata_dump_status - user friendly display of error info
782 * @id: id of the port in question
783 * @tf: ptr to filled out taskfile
785 * Decode and dump the ATA error/status registers for the user so
786 * that they have some idea what really happened at the non
787 * make-believe layer.
790 * inherited from caller
792 static void ata_dump_status(unsigned id
, struct ata_taskfile
*tf
)
794 u8 stat
= tf
->command
, err
= tf
->feature
;
796 printk(KERN_WARNING
"ata%u: status=0x%02x { ", id
, stat
);
797 if (stat
& ATA_BUSY
) {
798 printk("Busy }\n"); /* Data is not valid in this case */
800 if (stat
& 0x40) printk("DriveReady ");
801 if (stat
& 0x20) printk("DeviceFault ");
802 if (stat
& 0x10) printk("SeekComplete ");
803 if (stat
& 0x08) printk("DataRequest ");
804 if (stat
& 0x04) printk("CorrectedError ");
805 if (stat
& 0x02) printk("Index ");
806 if (stat
& 0x01) printk("Error ");
810 printk(KERN_WARNING
"ata%u: error=0x%02x { ", id
, err
);
811 if (err
& 0x04) printk("DriveStatusError ");
813 if (err
& 0x04) printk("BadCRC ");
814 else printk("Sector ");
816 if (err
& 0x40) printk("UncorrectableError ");
817 if (err
& 0x10) printk("SectorIdNotFound ");
818 if (err
& 0x02) printk("TrackZeroNotFound ");
819 if (err
& 0x01) printk("AddrMarkNotFound ");
826 * ata_to_sense_error - convert ATA error to SCSI error
827 * @id: ATA device number
828 * @drv_stat: value contained in ATA status register
829 * @drv_err: value contained in ATA error register
830 * @sk: the sense key we'll fill out
831 * @asc: the additional sense code we'll fill out
832 * @ascq: the additional sense code qualifier we'll fill out
833 * @verbose: be verbose
835 * Converts an ATA error into a SCSI error. Fill out pointers to
836 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
837 * format sense blocks.
840 * spin_lock_irqsave(host lock)
842 static void ata_to_sense_error(unsigned id
, u8 drv_stat
, u8 drv_err
, u8
*sk
,
843 u8
*asc
, u8
*ascq
, int verbose
)
847 /* Based on the 3ware driver translation table */
848 static const unsigned char sense_table
[][4] = {
850 {0xd1, ABORTED_COMMAND
, 0x00, 0x00}, // Device busy Aborted command
852 {0xd0, ABORTED_COMMAND
, 0x00, 0x00}, // Device busy Aborted command
854 {0x61, HARDWARE_ERROR
, 0x00, 0x00}, // Device fault Hardware error
855 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
856 {0x84, ABORTED_COMMAND
, 0x47, 0x00}, // Data CRC error SCSI parity error
857 /* MC|ID|ABRT|TRK0|MARK */
858 {0x37, NOT_READY
, 0x04, 0x00}, // Unit offline Not ready
860 {0x09, NOT_READY
, 0x04, 0x00}, // Unrecovered disk error Not ready
861 /* Bad address mark */
862 {0x01, MEDIUM_ERROR
, 0x13, 0x00}, // Address mark not found Address mark not found for data field
864 {0x02, HARDWARE_ERROR
, 0x00, 0x00}, // Track 0 not found Hardware error
866 {0x04, ABORTED_COMMAND
, 0x00, 0x00}, // Aborted command Aborted command
867 /* Media change request */
868 {0x08, NOT_READY
, 0x04, 0x00}, // Media change request FIXME: faking offline
870 {0x10, ABORTED_COMMAND
, 0x14, 0x00}, // ID not found Recorded entity not found
872 {0x08, NOT_READY
, 0x04, 0x00}, // Media change FIXME: faking offline
874 {0x40, MEDIUM_ERROR
, 0x11, 0x04}, // Uncorrectable ECC error Unrecovered read error
875 /* BBD - block marked bad */
876 {0x80, MEDIUM_ERROR
, 0x11, 0x04}, // Block marked bad Medium error, unrecovered read error
877 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
879 static const unsigned char stat_table
[][4] = {
880 /* Must be first because BUSY means no other bits valid */
881 {0x80, ABORTED_COMMAND
, 0x47, 0x00}, // Busy, fake parity for now
882 {0x20, HARDWARE_ERROR
, 0x00, 0x00}, // Device fault
883 {0x08, ABORTED_COMMAND
, 0x47, 0x00}, // Timed out in xfer, fake parity for now
884 {0x04, RECOVERED_ERROR
, 0x11, 0x00}, // Recovered ECC error Medium error, recovered
885 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
889 * Is this an error we can process/parse
891 if (drv_stat
& ATA_BUSY
) {
892 drv_err
= 0; /* Ignore the err bits, they're invalid */
896 /* Look for drv_err */
897 for (i
= 0; sense_table
[i
][0] != 0xFF; i
++) {
898 /* Look for best matches first */
899 if ((sense_table
[i
][0] & drv_err
) ==
901 *sk
= sense_table
[i
][1];
902 *asc
= sense_table
[i
][2];
903 *ascq
= sense_table
[i
][3];
907 /* No immediate match */
909 printk(KERN_WARNING
"ata%u: no sense translation for "
910 "error 0x%02x\n", id
, drv_err
);
913 /* Fall back to interpreting status bits */
914 for (i
= 0; stat_table
[i
][0] != 0xFF; i
++) {
915 if (stat_table
[i
][0] & drv_stat
) {
916 *sk
= stat_table
[i
][1];
917 *asc
= stat_table
[i
][2];
918 *ascq
= stat_table
[i
][3];
922 /* No error? Undecoded? */
924 printk(KERN_WARNING
"ata%u: no sense translation for "
925 "status: 0x%02x\n", id
, drv_stat
);
927 /* We need a sensible error return here, which is tricky, and one
928 that won't cause people to do things like return a disk wrongly */
929 *sk
= ABORTED_COMMAND
;
935 printk(KERN_ERR
"ata%u: translated ATA stat/err 0x%02x/%02x "
936 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
937 id
, drv_stat
, drv_err
, *sk
, *asc
, *ascq
);
942 * ata_gen_passthru_sense - Generate check condition sense block.
943 * @qc: Command that completed.
945 * This function is specific to the ATA descriptor format sense
946 * block specified for the ATA pass through commands. Regardless
947 * of whether the command errored or not, return a sense
948 * block. Copy all controller registers into the sense
949 * block. If there was no error, we get the request from an ATA
950 * passthrough command, so we use the following sense data:
951 * sk = RECOVERED ERROR
952 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
958 static void ata_gen_passthru_sense(struct ata_queued_cmd
*qc
)
960 struct scsi_cmnd
*cmd
= qc
->scsicmd
;
961 struct ata_taskfile
*tf
= &qc
->result_tf
;
962 unsigned char *sb
= cmd
->sense_buffer
;
963 unsigned char *desc
= sb
+ 8;
964 int verbose
= qc
->ap
->ops
->error_handler
== NULL
;
966 memset(sb
, 0, SCSI_SENSE_BUFFERSIZE
);
968 cmd
->result
= (DRIVER_SENSE
<< 24) | SAM_STAT_CHECK_CONDITION
;
971 * Use ata_to_sense_error() to map status register bits
972 * onto sense key, asc & ascq.
975 tf
->command
& (ATA_BUSY
| ATA_DF
| ATA_ERR
| ATA_DRQ
)) {
976 ata_to_sense_error(qc
->ap
->print_id
, tf
->command
, tf
->feature
,
977 &sb
[1], &sb
[2], &sb
[3], verbose
);
980 sb
[1] = RECOVERED_ERROR
;
986 * Sense data is current and format is descriptor.
992 /* set length of additional sense data */
997 * Copy registers into sense buffer.
1000 desc
[3] = tf
->feature
; /* == error reg */
1001 desc
[5] = tf
->nsect
;
1004 desc
[11] = tf
->lbah
;
1005 desc
[12] = tf
->device
;
1006 desc
[13] = tf
->command
; /* == status reg */
1009 * Fill in Extend bit, and the high order bytes
1012 if (tf
->flags
& ATA_TFLAG_LBA48
) {
1014 desc
[4] = tf
->hob_nsect
;
1015 desc
[6] = tf
->hob_lbal
;
1016 desc
[8] = tf
->hob_lbam
;
1017 desc
[10] = tf
->hob_lbah
;
1022 * ata_gen_ata_sense - generate a SCSI fixed sense block
1023 * @qc: Command that we are erroring out
1025 * Generate sense block for a failed ATA command @qc. Descriptor
1026 * format is used to accommodate LBA48 block address.
1031 static void ata_gen_ata_sense(struct ata_queued_cmd
*qc
)
1033 struct ata_device
*dev
= qc
->dev
;
1034 struct scsi_cmnd
*cmd
= qc
->scsicmd
;
1035 struct ata_taskfile
*tf
= &qc
->result_tf
;
1036 unsigned char *sb
= cmd
->sense_buffer
;
1037 unsigned char *desc
= sb
+ 8;
1038 int verbose
= qc
->ap
->ops
->error_handler
== NULL
;
1041 memset(sb
, 0, SCSI_SENSE_BUFFERSIZE
);
1043 cmd
->result
= (DRIVER_SENSE
<< 24) | SAM_STAT_CHECK_CONDITION
;
1045 /* sense data is current and format is descriptor */
1048 /* Use ata_to_sense_error() to map status register bits
1049 * onto sense key, asc & ascq.
1052 tf
->command
& (ATA_BUSY
| ATA_DF
| ATA_ERR
| ATA_DRQ
)) {
1053 ata_to_sense_error(qc
->ap
->print_id
, tf
->command
, tf
->feature
,
1054 &sb
[1], &sb
[2], &sb
[3], verbose
);
1058 block
= ata_tf_read_block(&qc
->result_tf
, dev
);
1060 /* information sense data descriptor */
1065 desc
[2] |= 0x80; /* valid */
1066 desc
[6] = block
>> 40;
1067 desc
[7] = block
>> 32;
1068 desc
[8] = block
>> 24;
1069 desc
[9] = block
>> 16;
1070 desc
[10] = block
>> 8;
1074 static void ata_scsi_sdev_config(struct scsi_device
*sdev
)
1076 sdev
->use_10_for_rw
= 1;
1077 sdev
->use_10_for_ms
= 1;
1078 sdev
->no_report_opcodes
= 1;
1079 sdev
->no_write_same
= 1;
1081 /* Schedule policy is determined by ->qc_defer() callback and
1082 * it needs to see every deferred qc. Set dev_blocked to 1 to
1083 * prevent SCSI midlayer from automatically deferring
1086 sdev
->max_device_blocked
= 1;
1090 * atapi_drain_needed - Check whether data transfer may overflow
1091 * @rq: request to be checked
1093 * ATAPI commands which transfer variable length data to host
1094 * might overflow due to application error or hardare bug. This
1095 * function checks whether overflow should be drained and ignored
1102 * 1 if ; otherwise, 0.
1104 static int atapi_drain_needed(struct request
*rq
)
1106 if (likely(rq
->cmd_type
!= REQ_TYPE_BLOCK_PC
))
1109 if (!blk_rq_bytes(rq
) || (rq
->cmd_flags
& REQ_WRITE
))
1112 return atapi_cmd_type(rq
->cmd
[0]) == ATAPI_MISC
;
1115 static int ata_scsi_dev_config(struct scsi_device
*sdev
,
1116 struct ata_device
*dev
)
1118 struct request_queue
*q
= sdev
->request_queue
;
1120 if (!ata_id_has_unload(dev
->id
))
1121 dev
->flags
|= ATA_DFLAG_NO_UNLOAD
;
1123 /* configure max sectors */
1124 blk_queue_max_hw_sectors(q
, dev
->max_sectors
);
1126 if (dev
->class == ATA_DEV_ATAPI
) {
1129 sdev
->sector_size
= ATA_SECT_SIZE
;
1131 /* set DMA padding */
1132 blk_queue_update_dma_pad(q
, ATA_DMA_PAD_SZ
- 1);
1134 /* configure draining */
1135 buf
= kmalloc(ATAPI_MAX_DRAIN
, q
->bounce_gfp
| GFP_KERNEL
);
1137 ata_dev_err(dev
, "drain buffer allocation failed\n");
1141 blk_queue_dma_drain(q
, atapi_drain_needed
, buf
, ATAPI_MAX_DRAIN
);
1143 sdev
->sector_size
= ata_id_logical_sector_size(dev
->id
);
1144 sdev
->manage_start_stop
= 1;
1148 * ata_pio_sectors() expects buffer for each sector to not cross
1149 * page boundary. Enforce it by requiring buffers to be sector
1150 * aligned, which works iff sector_size is not larger than
1151 * PAGE_SIZE. ATAPI devices also need the alignment as
1152 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1154 if (sdev
->sector_size
> PAGE_SIZE
)
1156 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1159 blk_queue_update_dma_alignment(q
, sdev
->sector_size
- 1);
1161 if (dev
->flags
& ATA_DFLAG_AN
)
1162 set_bit(SDEV_EVT_MEDIA_CHANGE
, sdev
->supported_events
);
1164 if (dev
->flags
& ATA_DFLAG_NCQ
) {
1167 depth
= min(sdev
->host
->can_queue
, ata_id_queue_depth(dev
->id
));
1168 depth
= min(ATA_MAX_QUEUE
- 1, depth
);
1169 scsi_adjust_queue_depth(sdev
, MSG_SIMPLE_TAG
, depth
);
1172 blk_queue_flush_queueable(q
, false);
1179 * ata_scsi_slave_config - Set SCSI device attributes
1180 * @sdev: SCSI device to examine
1182 * This is called before we actually start reading
1183 * and writing to the device, to configure certain
1184 * SCSI mid-layer behaviors.
1187 * Defined by SCSI layer. We don't really care.
1190 int ata_scsi_slave_config(struct scsi_device
*sdev
)
1192 struct ata_port
*ap
= ata_shost_to_port(sdev
->host
);
1193 struct ata_device
*dev
= __ata_scsi_find_dev(ap
, sdev
);
1196 ata_scsi_sdev_config(sdev
);
1199 rc
= ata_scsi_dev_config(sdev
, dev
);
1205 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1206 * @sdev: SCSI device to be destroyed
1208 * @sdev is about to be destroyed for hot/warm unplugging. If
1209 * this unplugging was initiated by libata as indicated by NULL
1210 * dev->sdev, this function doesn't have to do anything.
1211 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1212 * Clear dev->sdev, schedule the device for ATA detach and invoke
1216 * Defined by SCSI layer. We don't really care.
1218 void ata_scsi_slave_destroy(struct scsi_device
*sdev
)
1220 struct ata_port
*ap
= ata_shost_to_port(sdev
->host
);
1221 struct request_queue
*q
= sdev
->request_queue
;
1222 unsigned long flags
;
1223 struct ata_device
*dev
;
1225 if (!ap
->ops
->error_handler
)
1228 spin_lock_irqsave(ap
->lock
, flags
);
1229 dev
= __ata_scsi_find_dev(ap
, sdev
);
1230 if (dev
&& dev
->sdev
) {
1231 /* SCSI device already in CANCEL state, no need to offline it */
1233 dev
->flags
|= ATA_DFLAG_DETACH
;
1234 ata_port_schedule_eh(ap
);
1236 spin_unlock_irqrestore(ap
->lock
, flags
);
1238 kfree(q
->dma_drain_buffer
);
1239 q
->dma_drain_buffer
= NULL
;
1240 q
->dma_drain_size
= 0;
1244 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1245 * @ap: ATA port to which the device change the queue depth
1246 * @sdev: SCSI device to configure queue depth for
1247 * @queue_depth: new queue depth
1248 * @reason: calling context
1250 * libsas and libata have different approaches for associating a sdev to
1254 int __ata_change_queue_depth(struct ata_port
*ap
, struct scsi_device
*sdev
,
1255 int queue_depth
, int reason
)
1257 struct ata_device
*dev
;
1258 unsigned long flags
;
1260 if (reason
!= SCSI_QDEPTH_DEFAULT
)
1263 if (queue_depth
< 1 || queue_depth
== sdev
->queue_depth
)
1264 return sdev
->queue_depth
;
1266 dev
= ata_scsi_find_dev(ap
, sdev
);
1267 if (!dev
|| !ata_dev_enabled(dev
))
1268 return sdev
->queue_depth
;
1271 spin_lock_irqsave(ap
->lock
, flags
);
1272 dev
->flags
&= ~ATA_DFLAG_NCQ_OFF
;
1273 if (queue_depth
== 1 || !ata_ncq_enabled(dev
)) {
1274 dev
->flags
|= ATA_DFLAG_NCQ_OFF
;
1277 spin_unlock_irqrestore(ap
->lock
, flags
);
1279 /* limit and apply queue depth */
1280 queue_depth
= min(queue_depth
, sdev
->host
->can_queue
);
1281 queue_depth
= min(queue_depth
, ata_id_queue_depth(dev
->id
));
1282 queue_depth
= min(queue_depth
, ATA_MAX_QUEUE
- 1);
1284 if (sdev
->queue_depth
== queue_depth
)
1287 scsi_adjust_queue_depth(sdev
, MSG_SIMPLE_TAG
, queue_depth
);
1292 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1293 * @sdev: SCSI device to configure queue depth for
1294 * @queue_depth: new queue depth
1295 * @reason: calling context
1297 * This is libata standard hostt->change_queue_depth callback.
1298 * SCSI will call into this callback when user tries to set queue
1302 * SCSI layer (we don't care)
1305 * Newly configured queue depth.
1307 int ata_scsi_change_queue_depth(struct scsi_device
*sdev
, int queue_depth
,
1310 struct ata_port
*ap
= ata_shost_to_port(sdev
->host
);
1312 return __ata_change_queue_depth(ap
, sdev
, queue_depth
, reason
);
1316 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1317 * @qc: Storage for translated ATA taskfile
1319 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1320 * (to start). Perhaps these commands should be preceded by
1321 * CHECK POWER MODE to see what power mode the device is already in.
1322 * [See SAT revision 5 at www.t10.org]
1325 * spin_lock_irqsave(host lock)
1328 * Zero on success, non-zero on error.
1330 static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd
*qc
)
1332 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1333 struct ata_taskfile
*tf
= &qc
->tf
;
1334 const u8
*cdb
= scmd
->cmnd
;
1336 if (scmd
->cmd_len
< 5)
1339 tf
->flags
|= ATA_TFLAG_DEVICE
| ATA_TFLAG_ISADDR
;
1340 tf
->protocol
= ATA_PROT_NODATA
;
1342 ; /* ignore IMMED bit, violates sat-r05 */
1345 goto invalid_fld
; /* LOEJ bit set not supported */
1346 if (((cdb
[4] >> 4) & 0xf) != 0)
1347 goto invalid_fld
; /* power conditions not supported */
1350 tf
->nsect
= 1; /* 1 sector, lba=0 */
1352 if (qc
->dev
->flags
& ATA_DFLAG_LBA
) {
1353 tf
->flags
|= ATA_TFLAG_LBA
;
1358 tf
->device
|= ATA_LBA
;
1361 tf
->lbal
= 0x1; /* sect */
1362 tf
->lbam
= 0x0; /* cyl low */
1363 tf
->lbah
= 0x0; /* cyl high */
1366 tf
->command
= ATA_CMD_VERIFY
; /* READ VERIFY */
1368 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1369 * or S5) causing some drives to spin up and down again.
1371 if ((qc
->ap
->flags
& ATA_FLAG_NO_POWEROFF_SPINDOWN
) &&
1372 system_state
== SYSTEM_POWER_OFF
)
1375 if ((qc
->ap
->flags
& ATA_FLAG_NO_HIBERNATE_SPINDOWN
) &&
1376 system_entering_hibernation())
1379 /* Issue ATA STANDBY IMMEDIATE command */
1380 tf
->command
= ATA_CMD_STANDBYNOW1
;
1384 * Standby and Idle condition timers could be implemented but that
1385 * would require libata to implement the Power condition mode page
1386 * and allow the user to change it. Changing mode pages requires
1387 * MODE SELECT to be implemented.
1393 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x24, 0x0);
1394 /* "Invalid field in cbd" */
1397 scmd
->result
= SAM_STAT_GOOD
;
1403 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1404 * @qc: Storage for translated ATA taskfile
1406 * Sets up an ATA taskfile to issue FLUSH CACHE or
1410 * spin_lock_irqsave(host lock)
1413 * Zero on success, non-zero on error.
1415 static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd
*qc
)
1417 struct ata_taskfile
*tf
= &qc
->tf
;
1419 tf
->flags
|= ATA_TFLAG_DEVICE
;
1420 tf
->protocol
= ATA_PROT_NODATA
;
1422 if (qc
->dev
->flags
& ATA_DFLAG_FLUSH_EXT
)
1423 tf
->command
= ATA_CMD_FLUSH_EXT
;
1425 tf
->command
= ATA_CMD_FLUSH
;
1427 /* flush is critical for IO integrity, consider it an IO command */
1428 qc
->flags
|= ATA_QCFLAG_IO
;
1434 * scsi_6_lba_len - Get LBA and transfer length
1435 * @cdb: SCSI command to translate
1437 * Calculate LBA and transfer length for 6-byte commands.
1441 * @plen: the transfer length
1443 static void scsi_6_lba_len(const u8
*cdb
, u64
*plba
, u32
*plen
)
1448 VPRINTK("six-byte command\n");
1450 lba
|= ((u64
)(cdb
[1] & 0x1f)) << 16;
1451 lba
|= ((u64
)cdb
[2]) << 8;
1452 lba
|= ((u64
)cdb
[3]);
1461 * scsi_10_lba_len - Get LBA and transfer length
1462 * @cdb: SCSI command to translate
1464 * Calculate LBA and transfer length for 10-byte commands.
1468 * @plen: the transfer length
1470 static void scsi_10_lba_len(const u8
*cdb
, u64
*plba
, u32
*plen
)
1475 VPRINTK("ten-byte command\n");
1477 lba
|= ((u64
)cdb
[2]) << 24;
1478 lba
|= ((u64
)cdb
[3]) << 16;
1479 lba
|= ((u64
)cdb
[4]) << 8;
1480 lba
|= ((u64
)cdb
[5]);
1482 len
|= ((u32
)cdb
[7]) << 8;
1483 len
|= ((u32
)cdb
[8]);
1490 * scsi_16_lba_len - Get LBA and transfer length
1491 * @cdb: SCSI command to translate
1493 * Calculate LBA and transfer length for 16-byte commands.
1497 * @plen: the transfer length
1499 static void scsi_16_lba_len(const u8
*cdb
, u64
*plba
, u32
*plen
)
1504 VPRINTK("sixteen-byte command\n");
1506 lba
|= ((u64
)cdb
[2]) << 56;
1507 lba
|= ((u64
)cdb
[3]) << 48;
1508 lba
|= ((u64
)cdb
[4]) << 40;
1509 lba
|= ((u64
)cdb
[5]) << 32;
1510 lba
|= ((u64
)cdb
[6]) << 24;
1511 lba
|= ((u64
)cdb
[7]) << 16;
1512 lba
|= ((u64
)cdb
[8]) << 8;
1513 lba
|= ((u64
)cdb
[9]);
1515 len
|= ((u32
)cdb
[10]) << 24;
1516 len
|= ((u32
)cdb
[11]) << 16;
1517 len
|= ((u32
)cdb
[12]) << 8;
1518 len
|= ((u32
)cdb
[13]);
1525 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1526 * @qc: Storage for translated ATA taskfile
1528 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1531 * spin_lock_irqsave(host lock)
1534 * Zero on success, non-zero on error.
1536 static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd
*qc
)
1538 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1539 struct ata_taskfile
*tf
= &qc
->tf
;
1540 struct ata_device
*dev
= qc
->dev
;
1541 u64 dev_sectors
= qc
->dev
->n_sectors
;
1542 const u8
*cdb
= scmd
->cmnd
;
1546 tf
->flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
1547 tf
->protocol
= ATA_PROT_NODATA
;
1549 if (cdb
[0] == VERIFY
) {
1550 if (scmd
->cmd_len
< 10)
1552 scsi_10_lba_len(cdb
, &block
, &n_block
);
1553 } else if (cdb
[0] == VERIFY_16
) {
1554 if (scmd
->cmd_len
< 16)
1556 scsi_16_lba_len(cdb
, &block
, &n_block
);
1562 if (block
>= dev_sectors
)
1564 if ((block
+ n_block
) > dev_sectors
)
1567 if (dev
->flags
& ATA_DFLAG_LBA
) {
1568 tf
->flags
|= ATA_TFLAG_LBA
;
1570 if (lba_28_ok(block
, n_block
)) {
1572 tf
->command
= ATA_CMD_VERIFY
;
1573 tf
->device
|= (block
>> 24) & 0xf;
1574 } else if (lba_48_ok(block
, n_block
)) {
1575 if (!(dev
->flags
& ATA_DFLAG_LBA48
))
1579 tf
->flags
|= ATA_TFLAG_LBA48
;
1580 tf
->command
= ATA_CMD_VERIFY_EXT
;
1582 tf
->hob_nsect
= (n_block
>> 8) & 0xff;
1584 tf
->hob_lbah
= (block
>> 40) & 0xff;
1585 tf
->hob_lbam
= (block
>> 32) & 0xff;
1586 tf
->hob_lbal
= (block
>> 24) & 0xff;
1588 /* request too large even for LBA48 */
1591 tf
->nsect
= n_block
& 0xff;
1593 tf
->lbah
= (block
>> 16) & 0xff;
1594 tf
->lbam
= (block
>> 8) & 0xff;
1595 tf
->lbal
= block
& 0xff;
1597 tf
->device
|= ATA_LBA
;
1600 u32 sect
, head
, cyl
, track
;
1602 if (!lba_28_ok(block
, n_block
))
1605 /* Convert LBA to CHS */
1606 track
= (u32
)block
/ dev
->sectors
;
1607 cyl
= track
/ dev
->heads
;
1608 head
= track
% dev
->heads
;
1609 sect
= (u32
)block
% dev
->sectors
+ 1;
1611 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1612 (u32
)block
, track
, cyl
, head
, sect
);
1614 /* Check whether the converted CHS can fit.
1618 if ((cyl
>> 16) || (head
>> 4) || (sect
>> 8) || (!sect
))
1621 tf
->command
= ATA_CMD_VERIFY
;
1622 tf
->nsect
= n_block
& 0xff; /* Sector count 0 means 256 sectors */
1625 tf
->lbah
= cyl
>> 8;
1632 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x24, 0x0);
1633 /* "Invalid field in cbd" */
1637 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x21, 0x0);
1638 /* "Logical Block Address out of range" */
1642 scmd
->result
= SAM_STAT_GOOD
;
1647 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1648 * @qc: Storage for translated ATA taskfile
1650 * Converts any of six SCSI read/write commands into the
1651 * ATA counterpart, including starting sector (LBA),
1652 * sector count, and taking into account the device's LBA48
1655 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1656 * %WRITE_16 are currently supported.
1659 * spin_lock_irqsave(host lock)
1662 * Zero on success, non-zero on error.
1664 static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd
*qc
)
1666 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
1667 const u8
*cdb
= scmd
->cmnd
;
1668 unsigned int tf_flags
= 0;
1673 if (cdb
[0] == WRITE_10
|| cdb
[0] == WRITE_6
|| cdb
[0] == WRITE_16
)
1674 tf_flags
|= ATA_TFLAG_WRITE
;
1676 /* Calculate the SCSI LBA, transfer length and FUA. */
1680 if (unlikely(scmd
->cmd_len
< 10))
1682 scsi_10_lba_len(cdb
, &block
, &n_block
);
1683 if (cdb
[1] & (1 << 3))
1684 tf_flags
|= ATA_TFLAG_FUA
;
1688 if (unlikely(scmd
->cmd_len
< 6))
1690 scsi_6_lba_len(cdb
, &block
, &n_block
);
1692 /* for 6-byte r/w commands, transfer length 0
1693 * means 256 blocks of data, not 0 block.
1700 if (unlikely(scmd
->cmd_len
< 16))
1702 scsi_16_lba_len(cdb
, &block
, &n_block
);
1703 if (cdb
[1] & (1 << 3))
1704 tf_flags
|= ATA_TFLAG_FUA
;
1707 DPRINTK("no-byte command\n");
1711 /* Check and compose ATA command */
1713 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1714 * length 0 means transfer 0 block of data.
1715 * However, for ATA R/W commands, sector count 0 means
1716 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1718 * WARNING: one or two older ATA drives treat 0 as 0...
1722 qc
->flags
|= ATA_QCFLAG_IO
;
1723 qc
->nbytes
= n_block
* scmd
->device
->sector_size
;
1725 rc
= ata_build_rw_tf(&qc
->tf
, qc
->dev
, block
, n_block
, tf_flags
,
1727 if (likely(rc
== 0))
1732 /* treat all other errors as -EINVAL, fall through */
1734 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x24, 0x0);
1735 /* "Invalid field in cbd" */
1739 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x21, 0x0);
1740 /* "Logical Block Address out of range" */
1744 scmd
->result
= SAM_STAT_GOOD
;
1748 static void ata_scsi_qc_complete(struct ata_queued_cmd
*qc
)
1750 struct ata_port
*ap
= qc
->ap
;
1751 struct scsi_cmnd
*cmd
= qc
->scsicmd
;
1752 u8
*cdb
= cmd
->cmnd
;
1753 int need_sense
= (qc
->err_mask
!= 0);
1755 /* For ATA pass thru (SAT) commands, generate a sense block if
1756 * user mandated it or if there's an error. Note that if we
1757 * generate because the user forced us to [CK_COND =1], a check
1758 * condition is generated and the ATA register values are returned
1759 * whether the command completed successfully or not. If there
1760 * was no error, we use the following sense data:
1761 * sk = RECOVERED ERROR
1762 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1764 if (((cdb
[0] == ATA_16
) || (cdb
[0] == ATA_12
)) &&
1765 ((cdb
[2] & 0x20) || need_sense
)) {
1766 ata_gen_passthru_sense(qc
);
1769 cmd
->result
= SAM_STAT_GOOD
;
1771 /* TODO: decide which descriptor format to use
1772 * for 48b LBA devices and call that here
1773 * instead of the fixed desc, which is only
1774 * good for smaller LBA (and maybe CHS?)
1777 ata_gen_ata_sense(qc
);
1781 if (need_sense
&& !ap
->ops
->error_handler
)
1782 ata_dump_status(ap
->print_id
, &qc
->result_tf
);
1790 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1791 * @dev: ATA device to which the command is addressed
1792 * @cmd: SCSI command to execute
1793 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1795 * Our ->queuecommand() function has decided that the SCSI
1796 * command issued can be directly translated into an ATA
1797 * command, rather than handled internally.
1799 * This function sets up an ata_queued_cmd structure for the
1800 * SCSI command, and sends that ata_queued_cmd to the hardware.
1802 * The xlat_func argument (actor) returns 0 if ready to execute
1803 * ATA command, else 1 to finish translation. If 1 is returned
1804 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1805 * to be set reflecting an error condition or clean (early)
1809 * spin_lock_irqsave(host lock)
1812 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1813 * needs to be deferred.
1815 static int ata_scsi_translate(struct ata_device
*dev
, struct scsi_cmnd
*cmd
,
1816 ata_xlat_func_t xlat_func
)
1818 struct ata_port
*ap
= dev
->link
->ap
;
1819 struct ata_queued_cmd
*qc
;
1824 qc
= ata_scsi_qc_new(dev
, cmd
);
1828 /* data is present; dma-map it */
1829 if (cmd
->sc_data_direction
== DMA_FROM_DEVICE
||
1830 cmd
->sc_data_direction
== DMA_TO_DEVICE
) {
1831 if (unlikely(scsi_bufflen(cmd
) < 1)) {
1832 ata_dev_warn(dev
, "WARNING: zero len r/w req\n");
1836 ata_sg_init(qc
, scsi_sglist(cmd
), scsi_sg_count(cmd
));
1838 qc
->dma_dir
= cmd
->sc_data_direction
;
1841 qc
->complete_fn
= ata_scsi_qc_complete
;
1846 if (ap
->ops
->qc_defer
) {
1847 if ((rc
= ap
->ops
->qc_defer(qc
)))
1851 /* select device, send command to hardware */
1859 cmd
->scsi_done(cmd
);
1860 DPRINTK("EXIT - early finish (good or error)\n");
1865 cmd
->result
= (DID_ERROR
<< 16);
1866 cmd
->scsi_done(cmd
);
1868 DPRINTK("EXIT - internal\n");
1873 DPRINTK("EXIT - defer\n");
1874 if (rc
== ATA_DEFER_LINK
)
1875 return SCSI_MLQUEUE_DEVICE_BUSY
;
1877 return SCSI_MLQUEUE_HOST_BUSY
;
1881 * ata_scsi_rbuf_get - Map response buffer.
1882 * @cmd: SCSI command containing buffer to be mapped.
1883 * @flags: unsigned long variable to store irq enable status
1884 * @copy_in: copy in from user buffer
1886 * Prepare buffer for simulated SCSI commands.
1889 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1892 * Pointer to response buffer.
1894 static void *ata_scsi_rbuf_get(struct scsi_cmnd
*cmd
, bool copy_in
,
1895 unsigned long *flags
)
1897 spin_lock_irqsave(&ata_scsi_rbuf_lock
, *flags
);
1899 memset(ata_scsi_rbuf
, 0, ATA_SCSI_RBUF_SIZE
);
1901 sg_copy_to_buffer(scsi_sglist(cmd
), scsi_sg_count(cmd
),
1902 ata_scsi_rbuf
, ATA_SCSI_RBUF_SIZE
);
1903 return ata_scsi_rbuf
;
1907 * ata_scsi_rbuf_put - Unmap response buffer.
1908 * @cmd: SCSI command containing buffer to be unmapped.
1909 * @copy_out: copy out result
1910 * @flags: @flags passed to ata_scsi_rbuf_get()
1912 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1913 * @copy_back is true.
1916 * Unlocks ata_scsi_rbuf_lock.
1918 static inline void ata_scsi_rbuf_put(struct scsi_cmnd
*cmd
, bool copy_out
,
1919 unsigned long *flags
)
1922 sg_copy_from_buffer(scsi_sglist(cmd
), scsi_sg_count(cmd
),
1923 ata_scsi_rbuf
, ATA_SCSI_RBUF_SIZE
);
1924 spin_unlock_irqrestore(&ata_scsi_rbuf_lock
, *flags
);
1928 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1929 * @args: device IDENTIFY data / SCSI command of interest.
1930 * @actor: Callback hook for desired SCSI command simulator
1932 * Takes care of the hard work of simulating a SCSI command...
1933 * Mapping the response buffer, calling the command's handler,
1934 * and handling the handler's return value. This return value
1935 * indicates whether the handler wishes the SCSI command to be
1936 * completed successfully (0), or not (in which case cmd->result
1937 * and sense buffer are assumed to be set).
1940 * spin_lock_irqsave(host lock)
1942 static void ata_scsi_rbuf_fill(struct ata_scsi_args
*args
,
1943 unsigned int (*actor
)(struct ata_scsi_args
*args
, u8
*rbuf
))
1947 struct scsi_cmnd
*cmd
= args
->cmd
;
1948 unsigned long flags
;
1950 rbuf
= ata_scsi_rbuf_get(cmd
, false, &flags
);
1951 rc
= actor(args
, rbuf
);
1952 ata_scsi_rbuf_put(cmd
, rc
== 0, &flags
);
1955 cmd
->result
= SAM_STAT_GOOD
;
1960 * ata_scsiop_inq_std - Simulate INQUIRY command
1961 * @args: device IDENTIFY data / SCSI command of interest.
1962 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1964 * Returns standard device identification data associated
1965 * with non-VPD INQUIRY command output.
1968 * spin_lock_irqsave(host lock)
1970 static unsigned int ata_scsiop_inq_std(struct ata_scsi_args
*args
, u8
*rbuf
)
1972 const u8 versions
[] = {
1973 0x60, /* SAM-3 (no version claimed) */
1976 0x20, /* SBC-2 (no version claimed) */
1979 0x60 /* SPC-3 (no version claimed) */
1984 0x5, /* claim SPC-3 version compatibility */
1991 /* set scsi removeable (RMB) bit per ata bit */
1992 if (ata_id_removeable(args
->id
))
1995 memcpy(rbuf
, hdr
, sizeof(hdr
));
1996 memcpy(&rbuf
[8], "ATA ", 8);
1997 ata_id_string(args
->id
, &rbuf
[16], ATA_ID_PROD
, 16);
1998 ata_id_string(args
->id
, &rbuf
[32], ATA_ID_FW_REV
, 4);
2000 if (rbuf
[32] == 0 || rbuf
[32] == ' ')
2001 memcpy(&rbuf
[32], "n/a ", 4);
2003 memcpy(rbuf
+ 59, versions
, sizeof(versions
));
2009 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
2010 * @args: device IDENTIFY data / SCSI command of interest.
2011 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2013 * Returns list of inquiry VPD pages available.
2016 * spin_lock_irqsave(host lock)
2018 static unsigned int ata_scsiop_inq_00(struct ata_scsi_args
*args
, u8
*rbuf
)
2020 const u8 pages
[] = {
2021 0x00, /* page 0x00, this page */
2022 0x80, /* page 0x80, unit serial no page */
2023 0x83, /* page 0x83, device ident page */
2024 0x89, /* page 0x89, ata info page */
2025 0xb0, /* page 0xb0, block limits page */
2026 0xb1, /* page 0xb1, block device characteristics page */
2027 0xb2, /* page 0xb2, thin provisioning page */
2030 rbuf
[3] = sizeof(pages
); /* number of supported VPD pages */
2031 memcpy(rbuf
+ 4, pages
, sizeof(pages
));
2036 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2037 * @args: device IDENTIFY data / SCSI command of interest.
2038 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2040 * Returns ATA device serial number.
2043 * spin_lock_irqsave(host lock)
2045 static unsigned int ata_scsiop_inq_80(struct ata_scsi_args
*args
, u8
*rbuf
)
2049 0x80, /* this page code */
2051 ATA_ID_SERNO_LEN
, /* page len */
2054 memcpy(rbuf
, hdr
, sizeof(hdr
));
2055 ata_id_string(args
->id
, (unsigned char *) &rbuf
[4],
2056 ATA_ID_SERNO
, ATA_ID_SERNO_LEN
);
2061 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2062 * @args: device IDENTIFY data / SCSI command of interest.
2063 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2065 * Yields two logical unit device identification designators:
2066 * - vendor specific ASCII containing the ATA serial number
2067 * - SAT defined "t10 vendor id based" containing ASCII vendor
2068 * name ("ATA "), model and serial numbers.
2071 * spin_lock_irqsave(host lock)
2073 static unsigned int ata_scsiop_inq_83(struct ata_scsi_args
*args
, u8
*rbuf
)
2075 const int sat_model_serial_desc_len
= 68;
2078 rbuf
[1] = 0x83; /* this page code */
2081 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2083 rbuf
[num
+ 3] = ATA_ID_SERNO_LEN
;
2085 ata_id_string(args
->id
, (unsigned char *) rbuf
+ num
,
2086 ATA_ID_SERNO
, ATA_ID_SERNO_LEN
);
2087 num
+= ATA_ID_SERNO_LEN
;
2089 /* SAT defined lu model and serial numbers descriptor */
2090 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2093 rbuf
[num
+ 3] = sat_model_serial_desc_len
;
2095 memcpy(rbuf
+ num
, "ATA ", 8);
2097 ata_id_string(args
->id
, (unsigned char *) rbuf
+ num
, ATA_ID_PROD
,
2099 num
+= ATA_ID_PROD_LEN
;
2100 ata_id_string(args
->id
, (unsigned char *) rbuf
+ num
, ATA_ID_SERNO
,
2102 num
+= ATA_ID_SERNO_LEN
;
2104 if (ata_id_has_wwn(args
->id
)) {
2105 /* SAT defined lu world wide name */
2106 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2109 rbuf
[num
+ 3] = ATA_ID_WWN_LEN
;
2111 ata_id_string(args
->id
, (unsigned char *) rbuf
+ num
,
2112 ATA_ID_WWN
, ATA_ID_WWN_LEN
);
2113 num
+= ATA_ID_WWN_LEN
;
2115 rbuf
[3] = num
- 4; /* page len (assume less than 256 bytes) */
2120 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2121 * @args: device IDENTIFY data / SCSI command of interest.
2122 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2124 * Yields SAT-specified ATA VPD page.
2127 * spin_lock_irqsave(host lock)
2129 static unsigned int ata_scsiop_inq_89(struct ata_scsi_args
*args
, u8
*rbuf
)
2131 struct ata_taskfile tf
;
2133 memset(&tf
, 0, sizeof(tf
));
2135 rbuf
[1] = 0x89; /* our page code */
2136 rbuf
[2] = (0x238 >> 8); /* page size fixed at 238h */
2137 rbuf
[3] = (0x238 & 0xff);
2139 memcpy(&rbuf
[8], "linux ", 8);
2140 memcpy(&rbuf
[16], "libata ", 16);
2141 memcpy(&rbuf
[32], DRV_VERSION
, 4);
2143 /* we don't store the ATA device signature, so we fake it */
2145 tf
.command
= ATA_DRDY
; /* really, this is Status reg */
2149 ata_tf_to_fis(&tf
, 0, 1, &rbuf
[36]); /* TODO: PMP? */
2150 rbuf
[36] = 0x34; /* force D2H Reg FIS (34h) */
2152 rbuf
[56] = ATA_CMD_ID_ATA
;
2154 memcpy(&rbuf
[60], &args
->id
[0], 512);
2158 static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args
*args
, u8
*rbuf
)
2163 rbuf
[3] = 0x3c; /* required VPD size with unmap support */
2166 * Optimal transfer length granularity.
2168 * This is always one physical block, but for disks with a smaller
2169 * logical than physical sector size we need to figure out what the
2172 min_io_sectors
= 1 << ata_id_log2_per_physical_sector(args
->id
);
2173 put_unaligned_be16(min_io_sectors
, &rbuf
[6]);
2176 * Optimal unmap granularity.
2178 * The ATA spec doesn't even know about a granularity or alignment
2179 * for the TRIM command. We can leave away most of the unmap related
2180 * VPD page entries, but we have specifify a granularity to signal
2181 * that we support some form of unmap - in thise case via WRITE SAME
2182 * with the unmap bit set.
2184 if (ata_id_has_trim(args
->id
)) {
2185 put_unaligned_be64(65535 * 512 / 8, &rbuf
[36]);
2186 put_unaligned_be32(1, &rbuf
[28]);
2192 static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args
*args
, u8
*rbuf
)
2194 int form_factor
= ata_id_form_factor(args
->id
);
2195 int media_rotation_rate
= ata_id_rotation_rate(args
->id
);
2199 rbuf
[4] = media_rotation_rate
>> 8;
2200 rbuf
[5] = media_rotation_rate
;
2201 rbuf
[7] = form_factor
;
2206 static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args
*args
, u8
*rbuf
)
2208 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2211 rbuf
[5] = 1 << 6; /* TPWS */
2217 * ata_scsiop_noop - Command handler that simply returns success.
2218 * @args: device IDENTIFY data / SCSI command of interest.
2219 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2221 * No operation. Simply returns success to caller, to indicate
2222 * that the caller should successfully complete this SCSI command.
2225 * spin_lock_irqsave(host lock)
2227 static unsigned int ata_scsiop_noop(struct ata_scsi_args
*args
, u8
*rbuf
)
2234 * modecpy - Prepare response for MODE SENSE
2235 * @dest: output buffer
2236 * @src: data being copied
2237 * @n: length of mode page
2238 * @changeable: whether changeable parameters are requested
2240 * Generate a generic MODE SENSE page for either current or changeable
2246 static void modecpy(u8
*dest
, const u8
*src
, int n
, bool changeable
)
2249 memcpy(dest
, src
, 2);
2250 memset(dest
+ 2, 0, n
- 2);
2252 memcpy(dest
, src
, n
);
2257 * ata_msense_caching - Simulate MODE SENSE caching info page
2258 * @id: device IDENTIFY data
2259 * @buf: output buffer
2260 * @changeable: whether changeable parameters are requested
2262 * Generate a caching info page, which conditionally indicates
2263 * write caching to the SCSI layer, depending on device
2269 static unsigned int ata_msense_caching(u16
*id
, u8
*buf
, bool changeable
)
2271 modecpy(buf
, def_cache_mpage
, sizeof(def_cache_mpage
), changeable
);
2272 if (changeable
|| ata_id_wcache_enabled(id
))
2273 buf
[2] |= (1 << 2); /* write cache enable */
2274 if (!changeable
&& !ata_id_rahead_enabled(id
))
2275 buf
[12] |= (1 << 5); /* disable read ahead */
2276 return sizeof(def_cache_mpage
);
2280 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2281 * @buf: output buffer
2282 * @changeable: whether changeable parameters are requested
2284 * Generate a generic MODE SENSE control mode page.
2289 static unsigned int ata_msense_ctl_mode(u8
*buf
, bool changeable
)
2291 modecpy(buf
, def_control_mpage
, sizeof(def_control_mpage
), changeable
);
2292 return sizeof(def_control_mpage
);
2296 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2297 * @buf: output buffer
2298 * @changeable: whether changeable parameters are requested
2300 * Generate a generic MODE SENSE r/w error recovery page.
2305 static unsigned int ata_msense_rw_recovery(u8
*buf
, bool changeable
)
2307 modecpy(buf
, def_rw_recovery_mpage
, sizeof(def_rw_recovery_mpage
),
2309 return sizeof(def_rw_recovery_mpage
);
2313 * We can turn this into a real blacklist if it's needed, for now just
2314 * blacklist any Maxtor BANC1G10 revision firmware
2316 static int ata_dev_supports_fua(u16
*id
)
2318 unsigned char model
[ATA_ID_PROD_LEN
+ 1], fw
[ATA_ID_FW_REV_LEN
+ 1];
2322 if (!ata_id_has_fua(id
))
2325 ata_id_c_string(id
, model
, ATA_ID_PROD
, sizeof(model
));
2326 ata_id_c_string(id
, fw
, ATA_ID_FW_REV
, sizeof(fw
));
2328 if (strcmp(model
, "Maxtor"))
2330 if (strcmp(fw
, "BANC1G10"))
2333 return 0; /* blacklisted */
2337 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2338 * @args: device IDENTIFY data / SCSI command of interest.
2339 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2341 * Simulate MODE SENSE commands. Assume this is invoked for direct
2342 * access devices (e.g. disks) only. There should be no block
2343 * descriptor for other device types.
2346 * spin_lock_irqsave(host lock)
2348 static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args
*args
, u8
*rbuf
)
2350 struct ata_device
*dev
= args
->dev
;
2351 u8
*scsicmd
= args
->cmd
->cmnd
, *p
= rbuf
;
2352 const u8 sat_blk_desc
[] = {
2353 0, 0, 0, 0, /* number of blocks: sat unspecified */
2355 0, 0x2, 0x0 /* block length: 512 bytes */
2358 unsigned int ebd
, page_control
, six_byte
;
2363 six_byte
= (scsicmd
[0] == MODE_SENSE
);
2364 ebd
= !(scsicmd
[1] & 0x8); /* dbd bit inverted == edb */
2366 * LLBA bit in msense(10) ignored (compliant)
2369 page_control
= scsicmd
[2] >> 6;
2370 switch (page_control
) {
2371 case 0: /* current */
2372 case 1: /* changeable */
2373 case 2: /* defaults */
2374 break; /* supported */
2376 goto saving_not_supp
;
2382 p
+= 4 + (ebd
? 8 : 0);
2384 p
+= 8 + (ebd
? 8 : 0);
2386 pg
= scsicmd
[2] & 0x3f;
2389 * No mode subpages supported (yet) but asking for _all_
2390 * subpages may be valid
2392 if (spg
&& (spg
!= ALL_SUB_MPAGES
))
2396 case RW_RECOVERY_MPAGE
:
2397 p
+= ata_msense_rw_recovery(p
, page_control
== 1);
2401 p
+= ata_msense_caching(args
->id
, p
, page_control
== 1);
2405 p
+= ata_msense_ctl_mode(p
, page_control
== 1);
2409 p
+= ata_msense_rw_recovery(p
, page_control
== 1);
2410 p
+= ata_msense_caching(args
->id
, p
, page_control
== 1);
2411 p
+= ata_msense_ctl_mode(p
, page_control
== 1);
2414 default: /* invalid page code */
2419 if (ata_dev_supports_fua(args
->id
) && (dev
->flags
& ATA_DFLAG_LBA48
) &&
2420 (!(dev
->flags
& ATA_DFLAG_PIO
) || dev
->multi_count
))
2424 rbuf
[0] = p
- rbuf
- 1;
2427 rbuf
[3] = sizeof(sat_blk_desc
);
2428 memcpy(rbuf
+ 4, sat_blk_desc
, sizeof(sat_blk_desc
));
2431 unsigned int output_len
= p
- rbuf
- 2;
2433 rbuf
[0] = output_len
>> 8;
2434 rbuf
[1] = output_len
;
2437 rbuf
[7] = sizeof(sat_blk_desc
);
2438 memcpy(rbuf
+ 8, sat_blk_desc
, sizeof(sat_blk_desc
));
2444 ata_scsi_set_sense(args
->cmd
, ILLEGAL_REQUEST
, 0x24, 0x0);
2445 /* "Invalid field in cbd" */
2449 ata_scsi_set_sense(args
->cmd
, ILLEGAL_REQUEST
, 0x39, 0x0);
2450 /* "Saving parameters not supported" */
2455 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2456 * @args: device IDENTIFY data / SCSI command of interest.
2457 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2459 * Simulate READ CAPACITY commands.
2464 static unsigned int ata_scsiop_read_cap(struct ata_scsi_args
*args
, u8
*rbuf
)
2466 struct ata_device
*dev
= args
->dev
;
2467 u64 last_lba
= dev
->n_sectors
- 1; /* LBA of the last block */
2468 u32 sector_size
; /* physical sector size in bytes */
2472 sector_size
= ata_id_logical_sector_size(dev
->id
);
2473 log2_per_phys
= ata_id_log2_per_physical_sector(dev
->id
);
2474 lowest_aligned
= ata_id_logical_sector_offset(dev
->id
, log2_per_phys
);
2478 if (args
->cmd
->cmnd
[0] == READ_CAPACITY
) {
2479 if (last_lba
>= 0xffffffffULL
)
2480 last_lba
= 0xffffffff;
2482 /* sector count, 32-bit */
2483 rbuf
[0] = last_lba
>> (8 * 3);
2484 rbuf
[1] = last_lba
>> (8 * 2);
2485 rbuf
[2] = last_lba
>> (8 * 1);
2489 rbuf
[4] = sector_size
>> (8 * 3);
2490 rbuf
[5] = sector_size
>> (8 * 2);
2491 rbuf
[6] = sector_size
>> (8 * 1);
2492 rbuf
[7] = sector_size
;
2494 /* sector count, 64-bit */
2495 rbuf
[0] = last_lba
>> (8 * 7);
2496 rbuf
[1] = last_lba
>> (8 * 6);
2497 rbuf
[2] = last_lba
>> (8 * 5);
2498 rbuf
[3] = last_lba
>> (8 * 4);
2499 rbuf
[4] = last_lba
>> (8 * 3);
2500 rbuf
[5] = last_lba
>> (8 * 2);
2501 rbuf
[6] = last_lba
>> (8 * 1);
2505 rbuf
[ 8] = sector_size
>> (8 * 3);
2506 rbuf
[ 9] = sector_size
>> (8 * 2);
2507 rbuf
[10] = sector_size
>> (8 * 1);
2508 rbuf
[11] = sector_size
;
2511 rbuf
[13] = log2_per_phys
;
2512 rbuf
[14] = (lowest_aligned
>> 8) & 0x3f;
2513 rbuf
[15] = lowest_aligned
;
2515 if (ata_id_has_trim(args
->id
)) {
2516 rbuf
[14] |= 0x80; /* TPE */
2518 if (ata_id_has_zero_after_trim(args
->id
))
2519 rbuf
[14] |= 0x40; /* TPRZ */
2527 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2528 * @args: device IDENTIFY data / SCSI command of interest.
2529 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2531 * Simulate REPORT LUNS command.
2534 * spin_lock_irqsave(host lock)
2536 static unsigned int ata_scsiop_report_luns(struct ata_scsi_args
*args
, u8
*rbuf
)
2539 rbuf
[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2544 static void atapi_sense_complete(struct ata_queued_cmd
*qc
)
2546 if (qc
->err_mask
&& ((qc
->err_mask
& AC_ERR_DEV
) == 0)) {
2547 /* FIXME: not quite right; we don't want the
2548 * translation of taskfile registers into
2549 * a sense descriptors, since that's only
2550 * correct for ATA, not ATAPI
2552 ata_gen_passthru_sense(qc
);
2555 qc
->scsidone(qc
->scsicmd
);
2559 /* is it pointless to prefer PIO for "safety reasons"? */
2560 static inline int ata_pio_use_silly(struct ata_port
*ap
)
2562 return (ap
->flags
& ATA_FLAG_PIO_DMA
);
2565 static void atapi_request_sense(struct ata_queued_cmd
*qc
)
2567 struct ata_port
*ap
= qc
->ap
;
2568 struct scsi_cmnd
*cmd
= qc
->scsicmd
;
2570 DPRINTK("ATAPI request sense\n");
2572 /* FIXME: is this needed? */
2573 memset(cmd
->sense_buffer
, 0, SCSI_SENSE_BUFFERSIZE
);
2575 #ifdef CONFIG_ATA_SFF
2576 if (ap
->ops
->sff_tf_read
)
2577 ap
->ops
->sff_tf_read(ap
, &qc
->tf
);
2580 /* fill these in, for the case where they are -not- overwritten */
2581 cmd
->sense_buffer
[0] = 0x70;
2582 cmd
->sense_buffer
[2] = qc
->tf
.feature
>> 4;
2586 /* setup sg table and init transfer direction */
2587 sg_init_one(&qc
->sgent
, cmd
->sense_buffer
, SCSI_SENSE_BUFFERSIZE
);
2588 ata_sg_init(qc
, &qc
->sgent
, 1);
2589 qc
->dma_dir
= DMA_FROM_DEVICE
;
2591 memset(&qc
->cdb
, 0, qc
->dev
->cdb_len
);
2592 qc
->cdb
[0] = REQUEST_SENSE
;
2593 qc
->cdb
[4] = SCSI_SENSE_BUFFERSIZE
;
2595 qc
->tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2596 qc
->tf
.command
= ATA_CMD_PACKET
;
2598 if (ata_pio_use_silly(ap
)) {
2599 qc
->tf
.protocol
= ATAPI_PROT_DMA
;
2600 qc
->tf
.feature
|= ATAPI_PKT_DMA
;
2602 qc
->tf
.protocol
= ATAPI_PROT_PIO
;
2603 qc
->tf
.lbam
= SCSI_SENSE_BUFFERSIZE
;
2606 qc
->nbytes
= SCSI_SENSE_BUFFERSIZE
;
2608 qc
->complete_fn
= atapi_sense_complete
;
2615 static void atapi_qc_complete(struct ata_queued_cmd
*qc
)
2617 struct scsi_cmnd
*cmd
= qc
->scsicmd
;
2618 unsigned int err_mask
= qc
->err_mask
;
2620 VPRINTK("ENTER, err_mask 0x%X\n", err_mask
);
2622 /* handle completion from new EH */
2623 if (unlikely(qc
->ap
->ops
->error_handler
&&
2624 (err_mask
|| qc
->flags
& ATA_QCFLAG_SENSE_VALID
))) {
2626 if (!(qc
->flags
& ATA_QCFLAG_SENSE_VALID
)) {
2627 /* FIXME: not quite right; we don't want the
2628 * translation of taskfile registers into a
2629 * sense descriptors, since that's only
2630 * correct for ATA, not ATAPI
2632 ata_gen_passthru_sense(qc
);
2635 /* SCSI EH automatically locks door if sdev->locked is
2636 * set. Sometimes door lock request continues to
2637 * fail, for example, when no media is present. This
2638 * creates a loop - SCSI EH issues door lock which
2639 * fails and gets invoked again to acquire sense data
2640 * for the failed command.
2642 * If door lock fails, always clear sdev->locked to
2643 * avoid this infinite loop.
2645 * This may happen before SCSI scan is complete. Make
2646 * sure qc->dev->sdev isn't NULL before dereferencing.
2648 if (qc
->cdb
[0] == ALLOW_MEDIUM_REMOVAL
&& qc
->dev
->sdev
)
2649 qc
->dev
->sdev
->locked
= 0;
2651 qc
->scsicmd
->result
= SAM_STAT_CHECK_CONDITION
;
2657 /* successful completion or old EH failure path */
2658 if (unlikely(err_mask
& AC_ERR_DEV
)) {
2659 cmd
->result
= SAM_STAT_CHECK_CONDITION
;
2660 atapi_request_sense(qc
);
2662 } else if (unlikely(err_mask
)) {
2663 /* FIXME: not quite right; we don't want the
2664 * translation of taskfile registers into
2665 * a sense descriptors, since that's only
2666 * correct for ATA, not ATAPI
2668 ata_gen_passthru_sense(qc
);
2670 u8
*scsicmd
= cmd
->cmnd
;
2672 if ((scsicmd
[0] == INQUIRY
) && ((scsicmd
[1] & 0x03) == 0)) {
2673 unsigned long flags
;
2676 buf
= ata_scsi_rbuf_get(cmd
, true, &flags
);
2678 /* ATAPI devices typically report zero for their SCSI version,
2679 * and sometimes deviate from the spec WRT response data
2680 * format. If SCSI version is reported as zero like normal,
2681 * then we make the following fixups: 1) Fake MMC-5 version,
2682 * to indicate to the Linux scsi midlayer this is a modern
2683 * device. 2) Ensure response data format / ATAPI information
2684 * are always correct.
2691 ata_scsi_rbuf_put(cmd
, true, &flags
);
2694 cmd
->result
= SAM_STAT_GOOD
;
2701 * atapi_xlat - Initialize PACKET taskfile
2702 * @qc: command structure to be initialized
2705 * spin_lock_irqsave(host lock)
2708 * Zero on success, non-zero on failure.
2710 static unsigned int atapi_xlat(struct ata_queued_cmd
*qc
)
2712 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
2713 struct ata_device
*dev
= qc
->dev
;
2714 int nodata
= (scmd
->sc_data_direction
== DMA_NONE
);
2715 int using_pio
= !nodata
&& (dev
->flags
& ATA_DFLAG_PIO
);
2716 unsigned int nbytes
;
2718 memset(qc
->cdb
, 0, dev
->cdb_len
);
2719 memcpy(qc
->cdb
, scmd
->cmnd
, scmd
->cmd_len
);
2721 qc
->complete_fn
= atapi_qc_complete
;
2723 qc
->tf
.flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
2724 if (scmd
->sc_data_direction
== DMA_TO_DEVICE
) {
2725 qc
->tf
.flags
|= ATA_TFLAG_WRITE
;
2726 DPRINTK("direction: write\n");
2729 qc
->tf
.command
= ATA_CMD_PACKET
;
2730 ata_qc_set_pc_nbytes(qc
);
2732 /* check whether ATAPI DMA is safe */
2733 if (!nodata
&& !using_pio
&& atapi_check_dma(qc
))
2736 /* Some controller variants snoop this value for Packet
2737 * transfers to do state machine and FIFO management. Thus we
2738 * want to set it properly, and for DMA where it is
2739 * effectively meaningless.
2741 nbytes
= min(ata_qc_raw_nbytes(qc
), (unsigned int)63 * 1024);
2743 /* Most ATAPI devices which honor transfer chunk size don't
2744 * behave according to the spec when odd chunk size which
2745 * matches the transfer length is specified. If the number of
2746 * bytes to transfer is 2n+1. According to the spec, what
2747 * should happen is to indicate that 2n+1 is going to be
2748 * transferred and transfer 2n+2 bytes where the last byte is
2751 * In practice, this doesn't happen. ATAPI devices first
2752 * indicate and transfer 2n bytes and then indicate and
2753 * transfer 2 bytes where the last byte is padding.
2755 * This inconsistency confuses several controllers which
2756 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2757 * These controllers use actual number of transferred bytes to
2758 * update DMA poitner and transfer of 4n+2 bytes make those
2759 * controller push DMA pointer by 4n+4 bytes because SATA data
2760 * FISes are aligned to 4 bytes. This causes data corruption
2761 * and buffer overrun.
2763 * Always setting nbytes to even number solves this problem
2764 * because then ATAPI devices don't have to split data at 2n
2770 qc
->tf
.lbam
= (nbytes
& 0xFF);
2771 qc
->tf
.lbah
= (nbytes
>> 8);
2774 qc
->tf
.protocol
= ATAPI_PROT_NODATA
;
2776 qc
->tf
.protocol
= ATAPI_PROT_PIO
;
2779 qc
->tf
.protocol
= ATAPI_PROT_DMA
;
2780 qc
->tf
.feature
|= ATAPI_PKT_DMA
;
2782 if ((dev
->flags
& ATA_DFLAG_DMADIR
) &&
2783 (scmd
->sc_data_direction
!= DMA_TO_DEVICE
))
2784 /* some SATA bridges need us to indicate data xfer direction */
2785 qc
->tf
.feature
|= ATAPI_DMADIR
;
2789 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2790 as ATAPI tape drives don't get this right otherwise */
2794 static struct ata_device
*ata_find_dev(struct ata_port
*ap
, int devno
)
2796 if (!sata_pmp_attached(ap
)) {
2797 if (likely(devno
< ata_link_max_devices(&ap
->link
)))
2798 return &ap
->link
.device
[devno
];
2800 if (likely(devno
< ap
->nr_pmp_links
))
2801 return &ap
->pmp_link
[devno
].device
[0];
2807 static struct ata_device
*__ata_scsi_find_dev(struct ata_port
*ap
,
2808 const struct scsi_device
*scsidev
)
2812 /* skip commands not addressed to targets we simulate */
2813 if (!sata_pmp_attached(ap
)) {
2814 if (unlikely(scsidev
->channel
|| scsidev
->lun
))
2816 devno
= scsidev
->id
;
2818 if (unlikely(scsidev
->id
|| scsidev
->lun
))
2820 devno
= scsidev
->channel
;
2823 return ata_find_dev(ap
, devno
);
2827 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2828 * @ap: ATA port to which the device is attached
2829 * @scsidev: SCSI device from which we derive the ATA device
2831 * Given various information provided in struct scsi_cmnd,
2832 * map that onto an ATA bus, and using that mapping
2833 * determine which ata_device is associated with the
2834 * SCSI command to be sent.
2837 * spin_lock_irqsave(host lock)
2840 * Associated ATA device, or %NULL if not found.
2842 static struct ata_device
*
2843 ata_scsi_find_dev(struct ata_port
*ap
, const struct scsi_device
*scsidev
)
2845 struct ata_device
*dev
= __ata_scsi_find_dev(ap
, scsidev
);
2847 if (unlikely(!dev
|| !ata_dev_enabled(dev
)))
2854 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2855 * @byte1: Byte 1 from pass-thru CDB.
2858 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2861 ata_scsi_map_proto(u8 byte1
)
2863 switch((byte1
& 0x1e) >> 1) {
2864 case 3: /* Non-data */
2865 return ATA_PROT_NODATA
;
2868 case 10: /* UDMA Data-in */
2869 case 11: /* UDMA Data-Out */
2870 return ATA_PROT_DMA
;
2872 case 4: /* PIO Data-in */
2873 case 5: /* PIO Data-out */
2874 return ATA_PROT_PIO
;
2876 case 0: /* Hard Reset */
2878 case 8: /* Device Diagnostic */
2879 case 9: /* Device Reset */
2880 case 7: /* DMA Queued */
2881 case 12: /* FPDMA */
2882 case 15: /* Return Response Info */
2883 default: /* Reserved */
2887 return ATA_PROT_UNKNOWN
;
2891 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2892 * @qc: command structure to be initialized
2894 * Handles either 12 or 16-byte versions of the CDB.
2897 * Zero on success, non-zero on failure.
2899 static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd
*qc
)
2901 struct ata_taskfile
*tf
= &(qc
->tf
);
2902 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
2903 struct ata_device
*dev
= qc
->dev
;
2904 const u8
*cdb
= scmd
->cmnd
;
2906 if ((tf
->protocol
= ata_scsi_map_proto(cdb
[1])) == ATA_PROT_UNKNOWN
)
2910 * 12 and 16 byte CDBs use different offsets to
2911 * provide the various register values.
2913 if (cdb
[0] == ATA_16
) {
2915 * 16-byte CDB - may contain extended commands.
2917 * If that is the case, copy the upper byte register values.
2919 if (cdb
[1] & 0x01) {
2920 tf
->hob_feature
= cdb
[3];
2921 tf
->hob_nsect
= cdb
[5];
2922 tf
->hob_lbal
= cdb
[7];
2923 tf
->hob_lbam
= cdb
[9];
2924 tf
->hob_lbah
= cdb
[11];
2925 tf
->flags
|= ATA_TFLAG_LBA48
;
2927 tf
->flags
&= ~ATA_TFLAG_LBA48
;
2930 * Always copy low byte, device and command registers.
2932 tf
->feature
= cdb
[4];
2937 tf
->device
= cdb
[13];
2938 tf
->command
= cdb
[14];
2941 * 12-byte CDB - incapable of extended commands.
2943 tf
->flags
&= ~ATA_TFLAG_LBA48
;
2945 tf
->feature
= cdb
[3];
2950 tf
->device
= cdb
[8];
2951 tf
->command
= cdb
[9];
2954 /* enforce correct master/slave bit */
2955 tf
->device
= dev
->devno
?
2956 tf
->device
| ATA_DEV1
: tf
->device
& ~ATA_DEV1
;
2958 switch (tf
->command
) {
2959 /* READ/WRITE LONG use a non-standard sect_size */
2960 case ATA_CMD_READ_LONG
:
2961 case ATA_CMD_READ_LONG_ONCE
:
2962 case ATA_CMD_WRITE_LONG
:
2963 case ATA_CMD_WRITE_LONG_ONCE
:
2964 if (tf
->protocol
!= ATA_PROT_PIO
|| tf
->nsect
!= 1)
2966 qc
->sect_size
= scsi_bufflen(scmd
);
2969 /* commands using reported Logical Block size (e.g. 512 or 4K) */
2970 case ATA_CMD_CFA_WRITE_NE
:
2971 case ATA_CMD_CFA_TRANS_SECT
:
2972 case ATA_CMD_CFA_WRITE_MULT_NE
:
2973 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2975 case ATA_CMD_READ_EXT
:
2976 case ATA_CMD_READ_QUEUED
:
2977 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2978 case ATA_CMD_FPDMA_READ
:
2979 case ATA_CMD_READ_MULTI
:
2980 case ATA_CMD_READ_MULTI_EXT
:
2981 case ATA_CMD_PIO_READ
:
2982 case ATA_CMD_PIO_READ_EXT
:
2983 case ATA_CMD_READ_STREAM_DMA_EXT
:
2984 case ATA_CMD_READ_STREAM_EXT
:
2985 case ATA_CMD_VERIFY
:
2986 case ATA_CMD_VERIFY_EXT
:
2988 case ATA_CMD_WRITE_EXT
:
2989 case ATA_CMD_WRITE_FUA_EXT
:
2990 case ATA_CMD_WRITE_QUEUED
:
2991 case ATA_CMD_WRITE_QUEUED_FUA_EXT
:
2992 case ATA_CMD_FPDMA_WRITE
:
2993 case ATA_CMD_WRITE_MULTI
:
2994 case ATA_CMD_WRITE_MULTI_EXT
:
2995 case ATA_CMD_WRITE_MULTI_FUA_EXT
:
2996 case ATA_CMD_PIO_WRITE
:
2997 case ATA_CMD_PIO_WRITE_EXT
:
2998 case ATA_CMD_WRITE_STREAM_DMA_EXT
:
2999 case ATA_CMD_WRITE_STREAM_EXT
:
3000 qc
->sect_size
= scmd
->device
->sector_size
;
3003 /* Everything else uses 512 byte "sectors" */
3005 qc
->sect_size
= ATA_SECT_SIZE
;
3009 * Set flags so that all registers will be written, pass on
3010 * write indication (used for PIO/DMA setup), result TF is
3011 * copied back and we don't whine too much about its failure.
3013 tf
->flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
;
3014 if (scmd
->sc_data_direction
== DMA_TO_DEVICE
)
3015 tf
->flags
|= ATA_TFLAG_WRITE
;
3017 qc
->flags
|= ATA_QCFLAG_RESULT_TF
| ATA_QCFLAG_QUIET
;
3020 * Set transfer length.
3022 * TODO: find out if we need to do more here to
3023 * cover scatter/gather case.
3025 ata_qc_set_pc_nbytes(qc
);
3027 /* We may not issue DMA commands if no DMA mode is set */
3028 if (tf
->protocol
== ATA_PROT_DMA
&& dev
->dma_mode
== 0)
3031 /* sanity check for pio multi commands */
3032 if ((cdb
[1] & 0xe0) && !is_multi_taskfile(tf
))
3035 if (is_multi_taskfile(tf
)) {
3036 unsigned int multi_count
= 1 << (cdb
[1] >> 5);
3038 /* compare the passed through multi_count
3039 * with the cached multi_count of libata
3041 if (multi_count
!= dev
->multi_count
)
3042 ata_dev_warn(dev
, "invalid multi_count %u ignored\n",
3047 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3048 * SET_FEATURES - XFER MODE must be preceded/succeeded
3049 * by an update to hardware-specific registers for each
3050 * controller (i.e. the reason for ->set_piomode(),
3051 * ->set_dmamode(), and ->post_set_mode() hooks).
3053 if (tf
->command
== ATA_CMD_SET_FEATURES
&&
3054 tf
->feature
== SETFEATURES_XFER
)
3058 * Filter TPM commands by default. These provide an
3059 * essentially uncontrolled encrypted "back door" between
3060 * applications and the disk. Set libata.allow_tpm=1 if you
3061 * have a real reason for wanting to use them. This ensures
3062 * that installed software cannot easily mess stuff up without
3063 * user intent. DVR type users will probably ship with this enabled
3064 * for movie content management.
3066 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3067 * for this and should do in future but that it is not sufficient as
3068 * DCS is an optional feature set. Thus we also do the software filter
3069 * so that we comply with the TC consortium stated goal that the user
3070 * can turn off TC features of their system.
3072 if (tf
->command
>= 0x5C && tf
->command
<= 0x5F && !libata_allow_tpm
)
3078 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x24, 0x00);
3079 /* "Invalid field in cdb" */
3083 static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd
*qc
)
3085 struct ata_taskfile
*tf
= &qc
->tf
;
3086 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
3087 struct ata_device
*dev
= qc
->dev
;
3088 const u8
*cdb
= scmd
->cmnd
;
3094 /* we may not issue DMA commands if no DMA mode is set */
3095 if (unlikely(!dev
->dma_mode
))
3098 if (unlikely(scmd
->cmd_len
< 16))
3100 scsi_16_lba_len(cdb
, &block
, &n_block
);
3102 /* for now we only support WRITE SAME with the unmap bit set */
3103 if (unlikely(!(cdb
[1] & 0x8)))
3107 * WRITE SAME always has a sector sized buffer as payload, this
3108 * should never be a multiple entry S/G list.
3110 if (!scsi_sg_count(scmd
))
3113 buf
= page_address(sg_page(scsi_sglist(scmd
)));
3114 size
= ata_set_lba_range_entries(buf
, 512, block
, n_block
);
3116 tf
->protocol
= ATA_PROT_DMA
;
3117 tf
->hob_feature
= 0;
3118 tf
->feature
= ATA_DSM_TRIM
;
3119 tf
->hob_nsect
= (size
/ 512) >> 8;
3120 tf
->nsect
= size
/ 512;
3121 tf
->command
= ATA_CMD_DSM
;
3122 tf
->flags
|= ATA_TFLAG_ISADDR
| ATA_TFLAG_DEVICE
| ATA_TFLAG_LBA48
|
3125 ata_qc_set_pc_nbytes(qc
);
3130 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x24, 0x00);
3131 /* "Invalid field in cdb" */
3136 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3137 * @qc: Storage for translated ATA taskfile
3138 * @buf: input buffer
3139 * @len: number of valid bytes in the input buffer
3141 * Prepare a taskfile to modify caching information for the device.
3146 static int ata_mselect_caching(struct ata_queued_cmd
*qc
,
3147 const u8
*buf
, int len
)
3149 struct ata_taskfile
*tf
= &qc
->tf
;
3150 struct ata_device
*dev
= qc
->dev
;
3151 char mpage
[CACHE_MPAGE_LEN
];
3155 * The first two bytes of def_cache_mpage are a header, so offsets
3156 * in mpage are off by 2 compared to buf. Same for len.
3159 if (len
!= CACHE_MPAGE_LEN
- 2)
3162 wce
= buf
[0] & (1 << 2);
3165 * Check that read-only bits are not modified.
3167 ata_msense_caching(dev
->id
, mpage
, false);
3168 mpage
[2] &= ~(1 << 2);
3170 if (memcmp(mpage
+ 2, buf
, CACHE_MPAGE_LEN
- 2) != 0)
3173 tf
->flags
|= ATA_TFLAG_DEVICE
| ATA_TFLAG_ISADDR
;
3174 tf
->protocol
= ATA_PROT_NODATA
;
3176 tf
->command
= ATA_CMD_SET_FEATURES
;
3177 tf
->feature
= wce
? SETFEATURES_WC_ON
: SETFEATURES_WC_OFF
;
3182 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3183 * @qc: Storage for translated ATA taskfile
3185 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3186 * Assume this is invoked for direct access devices (e.g. disks) only.
3187 * There should be no block descriptor for other device types.
3190 * spin_lock_irqsave(host lock)
3192 static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd
*qc
)
3194 struct scsi_cmnd
*scmd
= qc
->scsicmd
;
3195 const u8
*cdb
= scmd
->cmnd
;
3198 unsigned six_byte
, pg_len
, hdr_len
, bd_len
;
3203 six_byte
= (cdb
[0] == MODE_SELECT
);
3205 if (scmd
->cmd_len
< 5)
3211 if (scmd
->cmd_len
< 9)
3214 len
= (cdb
[7] << 8) + cdb
[8];
3218 /* We only support PF=1, SP=0. */
3219 if ((cdb
[1] & 0x11) != 0x10)
3222 /* Test early for possible overrun. */
3223 if (!scsi_sg_count(scmd
) || scsi_sglist(scmd
)->length
< len
)
3224 goto invalid_param_len
;
3226 p
= page_address(sg_page(scsi_sglist(scmd
)));
3228 /* Move past header and block descriptors. */
3230 goto invalid_param_len
;
3235 bd_len
= (p
[6] << 8) + p
[7];
3240 goto invalid_param_len
;
3241 if (bd_len
!= 0 && bd_len
!= 8)
3249 /* Parse both possible formats for the mode page headers. */
3253 goto invalid_param_len
;
3256 pg_len
= (p
[2] << 8) | p
[3];
3261 goto invalid_param_len
;
3270 * No mode subpages supported (yet) but asking for _all_
3271 * subpages may be valid
3273 if (spg
&& (spg
!= ALL_SUB_MPAGES
))
3276 goto invalid_param_len
;
3280 if (ata_mselect_caching(qc
, p
, pg_len
) < 0)
3284 default: /* invalid page code */
3289 * Only one page has changeable data, so we only support setting one
3298 /* "Invalid field in CDB" */
3299 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x24, 0x0);
3303 /* "Invalid field in parameter list" */
3304 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x26, 0x0);
3308 /* "Parameter list length error" */
3309 ata_scsi_set_sense(scmd
, ILLEGAL_REQUEST
, 0x1a, 0x0);
3313 scmd
->result
= SAM_STAT_GOOD
;
3318 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3320 * @cmd: SCSI command opcode to consider
3322 * Look up the SCSI command given, and determine whether the
3323 * SCSI command is to be translated or simulated.
3326 * Pointer to translation function if possible, %NULL if not.
3329 static inline ata_xlat_func_t
ata_get_xlat_func(struct ata_device
*dev
, u8 cmd
)
3339 return ata_scsi_rw_xlat
;
3342 return ata_scsi_write_same_xlat
;
3344 case SYNCHRONIZE_CACHE
:
3345 if (ata_try_flush_cache(dev
))
3346 return ata_scsi_flush_xlat
;
3351 return ata_scsi_verify_xlat
;
3355 return ata_scsi_pass_thru
;
3358 case MODE_SELECT_10
:
3359 return ata_scsi_mode_select_xlat
;
3363 return ata_scsi_start_stop_xlat
;
3370 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3371 * @ap: ATA port to which the command was being sent
3372 * @cmd: SCSI command to dump
3374 * Prints the contents of a SCSI command via printk().
3377 static inline void ata_scsi_dump_cdb(struct ata_port
*ap
,
3378 struct scsi_cmnd
*cmd
)
3381 struct scsi_device
*scsidev
= cmd
->device
;
3382 u8
*scsicmd
= cmd
->cmnd
;
3384 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3386 scsidev
->channel
, scsidev
->id
, scsidev
->lun
,
3387 scsicmd
[0], scsicmd
[1], scsicmd
[2], scsicmd
[3],
3388 scsicmd
[4], scsicmd
[5], scsicmd
[6], scsicmd
[7],
3393 static inline int __ata_scsi_queuecmd(struct scsi_cmnd
*scmd
,
3394 struct ata_device
*dev
)
3396 u8 scsi_op
= scmd
->cmnd
[0];
3397 ata_xlat_func_t xlat_func
;
3400 if (dev
->class == ATA_DEV_ATA
) {
3401 if (unlikely(!scmd
->cmd_len
|| scmd
->cmd_len
> dev
->cdb_len
))
3404 xlat_func
= ata_get_xlat_func(dev
, scsi_op
);
3406 if (unlikely(!scmd
->cmd_len
))
3410 if (likely((scsi_op
!= ATA_16
) || !atapi_passthru16
)) {
3411 /* relay SCSI command to ATAPI device */
3412 int len
= COMMAND_SIZE(scsi_op
);
3413 if (unlikely(len
> scmd
->cmd_len
|| len
> dev
->cdb_len
))
3416 xlat_func
= atapi_xlat
;
3418 /* ATA_16 passthru, treat as an ATA command */
3419 if (unlikely(scmd
->cmd_len
> 16))
3422 xlat_func
= ata_get_xlat_func(dev
, scsi_op
);
3427 rc
= ata_scsi_translate(dev
, scmd
, xlat_func
);
3429 ata_scsi_simulate(dev
, scmd
);
3434 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3435 scmd
->cmd_len
, scsi_op
, dev
->cdb_len
);
3436 scmd
->result
= DID_ERROR
<< 16;
3437 scmd
->scsi_done(scmd
);
3442 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3443 * @shost: SCSI host of command to be sent
3444 * @cmd: SCSI command to be sent
3446 * In some cases, this function translates SCSI commands into
3447 * ATA taskfiles, and queues the taskfiles to be sent to
3448 * hardware. In other cases, this function simulates a
3449 * SCSI device by evaluating and responding to certain
3450 * SCSI commands. This creates the overall effect of
3451 * ATA and ATAPI devices appearing as SCSI devices.
3457 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3460 int ata_scsi_queuecmd(struct Scsi_Host
*shost
, struct scsi_cmnd
*cmd
)
3462 struct ata_port
*ap
;
3463 struct ata_device
*dev
;
3464 struct scsi_device
*scsidev
= cmd
->device
;
3466 unsigned long irq_flags
;
3468 ap
= ata_shost_to_port(shost
);
3470 spin_lock_irqsave(ap
->lock
, irq_flags
);
3472 ata_scsi_dump_cdb(ap
, cmd
);
3474 dev
= ata_scsi_find_dev(ap
, scsidev
);
3476 rc
= __ata_scsi_queuecmd(cmd
, dev
);
3478 cmd
->result
= (DID_BAD_TARGET
<< 16);
3479 cmd
->scsi_done(cmd
);
3482 spin_unlock_irqrestore(ap
->lock
, irq_flags
);
3488 * ata_scsi_simulate - simulate SCSI command on ATA device
3489 * @dev: the target device
3490 * @cmd: SCSI command being sent to device.
3492 * Interprets and directly executes a select list of SCSI commands
3493 * that can be handled internally.
3496 * spin_lock_irqsave(host lock)
3499 void ata_scsi_simulate(struct ata_device
*dev
, struct scsi_cmnd
*cmd
)
3501 struct ata_scsi_args args
;
3502 const u8
*scsicmd
= cmd
->cmnd
;
3508 args
.done
= cmd
->scsi_done
;
3510 switch(scsicmd
[0]) {
3511 /* TODO: worth improving? */
3513 ata_scsi_invalid_field(cmd
);
3517 if (scsicmd
[1] & 2) /* is CmdDt set? */
3518 ata_scsi_invalid_field(cmd
);
3519 else if ((scsicmd
[1] & 1) == 0) /* is EVPD clear? */
3520 ata_scsi_rbuf_fill(&args
, ata_scsiop_inq_std
);
3521 else switch (scsicmd
[2]) {
3523 ata_scsi_rbuf_fill(&args
, ata_scsiop_inq_00
);
3526 ata_scsi_rbuf_fill(&args
, ata_scsiop_inq_80
);
3529 ata_scsi_rbuf_fill(&args
, ata_scsiop_inq_83
);
3532 ata_scsi_rbuf_fill(&args
, ata_scsiop_inq_89
);
3535 ata_scsi_rbuf_fill(&args
, ata_scsiop_inq_b0
);
3538 ata_scsi_rbuf_fill(&args
, ata_scsiop_inq_b1
);
3541 ata_scsi_rbuf_fill(&args
, ata_scsiop_inq_b2
);
3544 ata_scsi_invalid_field(cmd
);
3551 ata_scsi_rbuf_fill(&args
, ata_scsiop_mode_sense
);
3555 ata_scsi_rbuf_fill(&args
, ata_scsiop_read_cap
);
3558 case SERVICE_ACTION_IN
:
3559 if ((scsicmd
[1] & 0x1f) == SAI_READ_CAPACITY_16
)
3560 ata_scsi_rbuf_fill(&args
, ata_scsiop_read_cap
);
3562 ata_scsi_invalid_field(cmd
);
3566 ata_scsi_rbuf_fill(&args
, ata_scsiop_report_luns
);
3570 ata_scsi_set_sense(cmd
, 0, 0, 0);
3571 cmd
->result
= (DRIVER_SENSE
<< 24);
3572 cmd
->scsi_done(cmd
);
3575 /* if we reach this, then writeback caching is disabled,
3576 * turning this into a no-op.
3578 case SYNCHRONIZE_CACHE
:
3581 /* no-op's, complete with success */
3585 case TEST_UNIT_READY
:
3586 ata_scsi_rbuf_fill(&args
, ata_scsiop_noop
);
3589 case SEND_DIAGNOSTIC
:
3590 tmp8
= scsicmd
[1] & ~(1 << 3);
3591 if ((tmp8
== 0x4) && (!scsicmd
[3]) && (!scsicmd
[4]))
3592 ata_scsi_rbuf_fill(&args
, ata_scsiop_noop
);
3594 ata_scsi_invalid_field(cmd
);
3597 /* all other commands */
3599 ata_scsi_set_sense(cmd
, ILLEGAL_REQUEST
, 0x20, 0x0);
3600 /* "Invalid command operation code" */
3601 cmd
->scsi_done(cmd
);
3606 int ata_scsi_add_hosts(struct ata_host
*host
, struct scsi_host_template
*sht
)
3610 for (i
= 0; i
< host
->n_ports
; i
++) {
3611 struct ata_port
*ap
= host
->ports
[i
];
3612 struct Scsi_Host
*shost
;
3615 shost
= scsi_host_alloc(sht
, sizeof(struct ata_port
*));
3619 shost
->eh_noresume
= 1;
3620 *(struct ata_port
**)&shost
->hostdata
[0] = ap
;
3621 ap
->scsi_host
= shost
;
3623 shost
->transportt
= ata_scsi_transport_template
;
3624 shost
->unique_id
= ap
->print_id
;
3627 shost
->max_channel
= 1;
3628 shost
->max_cmd_len
= 16;
3629 shost
->no_write_same
= 1;
3631 /* Schedule policy is determined by ->qc_defer()
3632 * callback and it needs to see every deferred qc.
3633 * Set host_blocked to 1 to prevent SCSI midlayer from
3634 * automatically deferring requests.
3636 shost
->max_host_blocked
= 1;
3638 rc
= scsi_add_host_with_dma(ap
->scsi_host
,
3639 &ap
->tdev
, ap
->host
->dev
);
3647 scsi_host_put(host
->ports
[i
]->scsi_host
);
3650 struct Scsi_Host
*shost
= host
->ports
[i
]->scsi_host
;
3652 scsi_remove_host(shost
);
3653 scsi_host_put(shost
);
3658 void ata_scsi_scan_host(struct ata_port
*ap
, int sync
)
3661 struct ata_device
*last_failed_dev
= NULL
;
3662 struct ata_link
*link
;
3663 struct ata_device
*dev
;
3666 ata_for_each_link(link
, ap
, EDGE
) {
3667 ata_for_each_dev(dev
, link
, ENABLED
) {
3668 struct scsi_device
*sdev
;
3669 int channel
= 0, id
= 0;
3674 if (ata_is_host_link(link
))
3677 channel
= link
->pmp
;
3679 sdev
= __scsi_add_device(ap
->scsi_host
, channel
, id
, 0,
3681 if (!IS_ERR(sdev
)) {
3683 scsi_device_put(sdev
);
3684 if (zpodd_dev_enabled(dev
))
3685 dev_pm_qos_expose_flags(
3686 &sdev
->sdev_gendev
, 0);
3693 /* If we scanned while EH was in progress or allocation
3694 * failure occurred, scan would have failed silently. Check
3695 * whether all devices are attached.
3697 ata_for_each_link(link
, ap
, EDGE
) {
3698 ata_for_each_dev(dev
, link
, ENABLED
) {
3707 /* we're missing some SCSI devices */
3709 /* If caller requested synchrnous scan && we've made
3710 * any progress, sleep briefly and repeat.
3712 if (dev
!= last_failed_dev
) {
3714 last_failed_dev
= dev
;
3718 /* We might be failing to detect boot device, give it
3719 * a few more chances.
3727 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
3730 queue_delayed_work(system_long_wq
, &ap
->hotplug_task
,
3731 round_jiffies_relative(HZ
));
3735 * ata_scsi_offline_dev - offline attached SCSI device
3736 * @dev: ATA device to offline attached SCSI device for
3738 * This function is called from ata_eh_hotplug() and responsible
3739 * for taking the SCSI device attached to @dev offline. This
3740 * function is called with host lock which protects dev->sdev
3744 * spin_lock_irqsave(host lock)
3747 * 1 if attached SCSI device exists, 0 otherwise.
3749 int ata_scsi_offline_dev(struct ata_device
*dev
)
3752 scsi_device_set_state(dev
->sdev
, SDEV_OFFLINE
);
3759 * ata_scsi_remove_dev - remove attached SCSI device
3760 * @dev: ATA device to remove attached SCSI device for
3762 * This function is called from ata_eh_scsi_hotplug() and
3763 * responsible for removing the SCSI device attached to @dev.
3766 * Kernel thread context (may sleep).
3768 static void ata_scsi_remove_dev(struct ata_device
*dev
)
3770 struct ata_port
*ap
= dev
->link
->ap
;
3771 struct scsi_device
*sdev
;
3772 unsigned long flags
;
3774 /* Alas, we need to grab scan_mutex to ensure SCSI device
3775 * state doesn't change underneath us and thus
3776 * scsi_device_get() always succeeds. The mutex locking can
3777 * be removed if there is __scsi_device_get() interface which
3778 * increments reference counts regardless of device state.
3780 mutex_lock(&ap
->scsi_host
->scan_mutex
);
3781 spin_lock_irqsave(ap
->lock
, flags
);
3783 if (zpodd_dev_enabled(dev
))
3786 /* clearing dev->sdev is protected by host lock */
3791 /* If user initiated unplug races with us, sdev can go
3792 * away underneath us after the host lock and
3793 * scan_mutex are released. Hold onto it.
3795 if (scsi_device_get(sdev
) == 0) {
3796 /* The following ensures the attached sdev is
3797 * offline on return from ata_scsi_offline_dev()
3798 * regardless it wins or loses the race
3799 * against this function.
3801 scsi_device_set_state(sdev
, SDEV_OFFLINE
);
3808 spin_unlock_irqrestore(ap
->lock
, flags
);
3809 mutex_unlock(&ap
->scsi_host
->scan_mutex
);
3812 ata_dev_info(dev
, "detaching (SCSI %s)\n",
3813 dev_name(&sdev
->sdev_gendev
));
3815 scsi_remove_device(sdev
);
3816 scsi_device_put(sdev
);
3820 static void ata_scsi_handle_link_detach(struct ata_link
*link
)
3822 struct ata_port
*ap
= link
->ap
;
3823 struct ata_device
*dev
;
3825 ata_for_each_dev(dev
, link
, ALL
) {
3826 unsigned long flags
;
3828 if (!(dev
->flags
& ATA_DFLAG_DETACHED
))
3831 spin_lock_irqsave(ap
->lock
, flags
);
3832 dev
->flags
&= ~ATA_DFLAG_DETACHED
;
3833 spin_unlock_irqrestore(ap
->lock
, flags
);
3835 ata_scsi_remove_dev(dev
);
3840 * ata_scsi_media_change_notify - send media change event
3841 * @dev: Pointer to the disk device with media change event
3843 * Tell the block layer to send a media change notification
3847 * spin_lock_irqsave(host lock)
3849 void ata_scsi_media_change_notify(struct ata_device
*dev
)
3852 sdev_evt_send_simple(dev
->sdev
, SDEV_EVT_MEDIA_CHANGE
,
3857 * ata_scsi_hotplug - SCSI part of hotplug
3858 * @work: Pointer to ATA port to perform SCSI hotplug on
3860 * Perform SCSI part of hotplug. It's executed from a separate
3861 * workqueue after EH completes. This is necessary because SCSI
3862 * hot plugging requires working EH and hot unplugging is
3863 * synchronized with hot plugging with a mutex.
3866 * Kernel thread context (may sleep).
3868 void ata_scsi_hotplug(struct work_struct
*work
)
3870 struct ata_port
*ap
=
3871 container_of(work
, struct ata_port
, hotplug_task
.work
);
3874 if (ap
->pflags
& ATA_PFLAG_UNLOADING
) {
3875 DPRINTK("ENTER/EXIT - unloading\n");
3882 * The block layer suspend/resume path is fundamentally broken due
3883 * to freezable kthreads and workqueue and may deadlock if a block
3884 * device gets removed while resume is in progress. I don't know
3885 * what the solution is short of removing freezable kthreads and
3886 * workqueues altogether.
3888 * The following is an ugly hack to avoid kicking off device
3889 * removal while freezer is active. This is a joke but does avoid
3890 * this particular deadlock scenario.
3892 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
3893 * http://marc.info/?l=linux-kernel&m=138695698516487
3895 #ifdef CONFIG_FREEZER
3901 mutex_lock(&ap
->scsi_scan_mutex
);
3903 /* Unplug detached devices. We cannot use link iterator here
3904 * because PMP links have to be scanned even if PMP is
3905 * currently not attached. Iterate manually.
3907 ata_scsi_handle_link_detach(&ap
->link
);
3909 for (i
= 0; i
< SATA_PMP_MAX_PORTS
; i
++)
3910 ata_scsi_handle_link_detach(&ap
->pmp_link
[i
]);
3912 /* scan for new ones */
3913 ata_scsi_scan_host(ap
, 0);
3915 mutex_unlock(&ap
->scsi_scan_mutex
);
3920 * ata_scsi_user_scan - indication for user-initiated bus scan
3921 * @shost: SCSI host to scan
3922 * @channel: Channel to scan
3926 * This function is called when user explicitly requests bus
3927 * scan. Set probe pending flag and invoke EH.
3930 * SCSI layer (we don't care)
3935 int ata_scsi_user_scan(struct Scsi_Host
*shost
, unsigned int channel
,
3936 unsigned int id
, unsigned int lun
)
3938 struct ata_port
*ap
= ata_shost_to_port(shost
);
3939 unsigned long flags
;
3942 if (!ap
->ops
->error_handler
)
3945 if (lun
!= SCAN_WILD_CARD
&& lun
)
3948 if (!sata_pmp_attached(ap
)) {
3949 if (channel
!= SCAN_WILD_CARD
&& channel
)
3953 if (id
!= SCAN_WILD_CARD
&& id
)
3958 spin_lock_irqsave(ap
->lock
, flags
);
3960 if (devno
== SCAN_WILD_CARD
) {
3961 struct ata_link
*link
;
3963 ata_for_each_link(link
, ap
, EDGE
) {
3964 struct ata_eh_info
*ehi
= &link
->eh_info
;
3965 ehi
->probe_mask
|= ATA_ALL_DEVICES
;
3966 ehi
->action
|= ATA_EH_RESET
;
3969 struct ata_device
*dev
= ata_find_dev(ap
, devno
);
3972 struct ata_eh_info
*ehi
= &dev
->link
->eh_info
;
3973 ehi
->probe_mask
|= 1 << dev
->devno
;
3974 ehi
->action
|= ATA_EH_RESET
;
3980 ata_port_schedule_eh(ap
);
3981 spin_unlock_irqrestore(ap
->lock
, flags
);
3982 ata_port_wait_eh(ap
);
3984 spin_unlock_irqrestore(ap
->lock
, flags
);
3990 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
3991 * @work: Pointer to ATA port to perform scsi_rescan_device()
3993 * After ATA pass thru (SAT) commands are executed successfully,
3994 * libata need to propagate the changes to SCSI layer.
3997 * Kernel thread context (may sleep).
3999 void ata_scsi_dev_rescan(struct work_struct
*work
)
4001 struct ata_port
*ap
=
4002 container_of(work
, struct ata_port
, scsi_rescan_task
);
4003 struct ata_link
*link
;
4004 struct ata_device
*dev
;
4005 unsigned long flags
;
4007 mutex_lock(&ap
->scsi_scan_mutex
);
4008 spin_lock_irqsave(ap
->lock
, flags
);
4010 ata_for_each_link(link
, ap
, EDGE
) {
4011 ata_for_each_dev(dev
, link
, ENABLED
) {
4012 struct scsi_device
*sdev
= dev
->sdev
;
4016 if (scsi_device_get(sdev
))
4019 spin_unlock_irqrestore(ap
->lock
, flags
);
4020 scsi_rescan_device(&(sdev
->sdev_gendev
));
4021 scsi_device_put(sdev
);
4022 spin_lock_irqsave(ap
->lock
, flags
);
4026 spin_unlock_irqrestore(ap
->lock
, flags
);
4027 mutex_unlock(&ap
->scsi_scan_mutex
);
4031 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4032 * @host: ATA host container for all SAS ports
4033 * @port_info: Information from low-level host driver
4034 * @shost: SCSI host that the scsi device is attached to
4037 * PCI/etc. bus probe sem.
4040 * ata_port pointer on success / NULL on failure.
4043 struct ata_port
*ata_sas_port_alloc(struct ata_host
*host
,
4044 struct ata_port_info
*port_info
,
4045 struct Scsi_Host
*shost
)
4047 struct ata_port
*ap
;
4049 ap
= ata_port_alloc(host
);
4054 ap
->lock
= &host
->lock
;
4055 ap
->pio_mask
= port_info
->pio_mask
;
4056 ap
->mwdma_mask
= port_info
->mwdma_mask
;
4057 ap
->udma_mask
= port_info
->udma_mask
;
4058 ap
->flags
|= port_info
->flags
;
4059 ap
->ops
= port_info
->port_ops
;
4060 ap
->cbl
= ATA_CBL_SATA
;
4064 EXPORT_SYMBOL_GPL(ata_sas_port_alloc
);
4067 * ata_sas_port_start - Set port up for dma.
4068 * @ap: Port to initialize
4070 * Called just after data structures for each port are
4073 * May be used as the port_start() entry in ata_port_operations.
4076 * Inherited from caller.
4078 int ata_sas_port_start(struct ata_port
*ap
)
4081 * the port is marked as frozen at allocation time, but if we don't
4082 * have new eh, we won't thaw it
4084 if (!ap
->ops
->error_handler
)
4085 ap
->pflags
&= ~ATA_PFLAG_FROZEN
;
4088 EXPORT_SYMBOL_GPL(ata_sas_port_start
);
4091 * ata_port_stop - Undo ata_sas_port_start()
4092 * @ap: Port to shut down
4094 * May be used as the port_stop() entry in ata_port_operations.
4097 * Inherited from caller.
4100 void ata_sas_port_stop(struct ata_port
*ap
)
4103 EXPORT_SYMBOL_GPL(ata_sas_port_stop
);
4106 * ata_sas_async_probe - simply schedule probing and return
4107 * @ap: Port to probe
4109 * For batch scheduling of probe for sas attached ata devices, assumes
4110 * the port has already been through ata_sas_port_init()
4112 void ata_sas_async_probe(struct ata_port
*ap
)
4114 __ata_port_probe(ap
);
4116 EXPORT_SYMBOL_GPL(ata_sas_async_probe
);
4118 int ata_sas_sync_probe(struct ata_port
*ap
)
4120 return ata_port_probe(ap
);
4122 EXPORT_SYMBOL_GPL(ata_sas_sync_probe
);
4126 * ata_sas_port_init - Initialize a SATA device
4127 * @ap: SATA port to initialize
4130 * PCI/etc. bus probe sem.
4133 * Zero on success, non-zero on error.
4136 int ata_sas_port_init(struct ata_port
*ap
)
4138 int rc
= ap
->ops
->port_start(ap
);
4142 ap
->print_id
= atomic_inc_return(&ata_print_id
);
4145 EXPORT_SYMBOL_GPL(ata_sas_port_init
);
4148 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4149 * @ap: SATA port to destroy
4153 void ata_sas_port_destroy(struct ata_port
*ap
)
4155 if (ap
->ops
->port_stop
)
4156 ap
->ops
->port_stop(ap
);
4159 EXPORT_SYMBOL_GPL(ata_sas_port_destroy
);
4162 * ata_sas_slave_configure - Default slave_config routine for libata devices
4163 * @sdev: SCSI device to configure
4164 * @ap: ATA port to which SCSI device is attached
4170 int ata_sas_slave_configure(struct scsi_device
*sdev
, struct ata_port
*ap
)
4172 ata_scsi_sdev_config(sdev
);
4173 ata_scsi_dev_config(sdev
, ap
->link
.device
);
4176 EXPORT_SYMBOL_GPL(ata_sas_slave_configure
);
4179 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4180 * @cmd: SCSI command to be sent
4181 * @ap: ATA port to which the command is being sent
4184 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4188 int ata_sas_queuecmd(struct scsi_cmnd
*cmd
, struct ata_port
*ap
)
4192 ata_scsi_dump_cdb(ap
, cmd
);
4194 if (likely(ata_dev_enabled(ap
->link
.device
)))
4195 rc
= __ata_scsi_queuecmd(cmd
, ap
->link
.device
);
4197 cmd
->result
= (DID_BAD_TARGET
<< 16);
4198 cmd
->scsi_done(cmd
);
4202 EXPORT_SYMBOL_GPL(ata_sas_queuecmd
);