4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
7 * The general scanning/probing algorithm is as follows, exceptions are
8 * made to it depending on device specific flags, compilation options, and
9 * global variable (boot or module load time) settings.
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
12 * device attached, a scsi_device is allocated and setup for it.
14 * For every id of every channel on the given host:
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
19 * If LUN 0 has a device attached, allocate and setup a
22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
23 * all of the LUNs returned by the REPORT LUN; else,
24 * sequentially scan LUNs up until some maximum is reached,
25 * or a LUN is seen that cannot have a device attached to it.
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/init.h>
31 #include <linux/blkdev.h>
32 #include <linux/delay.h>
33 #include <linux/kthread.h>
34 #include <linux/spinlock.h>
35 #include <linux/async.h>
36 #include <linux/slab.h>
37 #include <asm/unaligned.h>
39 #include <scsi/scsi.h>
40 #include <scsi/scsi_cmnd.h>
41 #include <scsi/scsi_device.h>
42 #include <scsi/scsi_driver.h>
43 #include <scsi/scsi_devinfo.h>
44 #include <scsi/scsi_host.h>
45 #include <scsi/scsi_transport.h>
46 #include <scsi/scsi_eh.h>
48 #include "scsi_priv.h"
49 #include "scsi_logging.h"
51 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
52 " SCSI scanning, some SCSI devices might not be configured\n"
57 #define SCSI_TIMEOUT (2*HZ)
60 * Prefix values for the SCSI id's (stored in sysfs name field)
62 #define SCSI_UID_SER_NUM 'S'
63 #define SCSI_UID_UNKNOWN 'Z'
66 * Return values of some of the scanning functions.
68 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
69 * includes allocation or general failures preventing IO from being sent.
71 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
74 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
77 #define SCSI_SCAN_NO_RESPONSE 0
78 #define SCSI_SCAN_TARGET_PRESENT 1
79 #define SCSI_SCAN_LUN_PRESENT 2
81 static const char *scsi_null_device_strs
= "nullnullnullnull";
83 #define MAX_SCSI_LUNS 512
85 static u64 max_scsi_luns
= MAX_SCSI_LUNS
;
87 module_param_named(max_luns
, max_scsi_luns
, ullong
, S_IRUGO
|S_IWUSR
);
88 MODULE_PARM_DESC(max_luns
,
89 "last scsi LUN (should be between 1 and 2^64-1)");
91 #ifdef CONFIG_SCSI_SCAN_ASYNC
92 #define SCSI_SCAN_TYPE_DEFAULT "async"
94 #define SCSI_SCAN_TYPE_DEFAULT "sync"
97 char scsi_scan_type
[6] = SCSI_SCAN_TYPE_DEFAULT
;
99 module_param_string(scan
, scsi_scan_type
, sizeof(scsi_scan_type
), S_IRUGO
);
100 MODULE_PARM_DESC(scan
, "sync, async or none");
102 static unsigned int scsi_inq_timeout
= SCSI_TIMEOUT
/HZ
+ 18;
104 module_param_named(inq_timeout
, scsi_inq_timeout
, uint
, S_IRUGO
|S_IWUSR
);
105 MODULE_PARM_DESC(inq_timeout
,
106 "Timeout (in seconds) waiting for devices to answer INQUIRY."
107 " Default is 20. Some devices may need more; most need less.");
109 /* This lock protects only this list */
110 static DEFINE_SPINLOCK(async_scan_lock
);
111 static LIST_HEAD(scanning_hosts
);
113 struct async_scan_data
{
114 struct list_head list
;
115 struct Scsi_Host
*shost
;
116 struct completion prev_finished
;
120 * scsi_complete_async_scans - Wait for asynchronous scans to complete
122 * When this function returns, any host which started scanning before
123 * this function was called will have finished its scan. Hosts which
124 * started scanning after this function was called may or may not have
127 int scsi_complete_async_scans(void)
129 struct async_scan_data
*data
;
132 if (list_empty(&scanning_hosts
))
134 /* If we can't get memory immediately, that's OK. Just
135 * sleep a little. Even if we never get memory, the async
136 * scans will finish eventually.
138 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
144 init_completion(&data
->prev_finished
);
146 spin_lock(&async_scan_lock
);
147 /* Check that there's still somebody else on the list */
148 if (list_empty(&scanning_hosts
))
150 list_add_tail(&data
->list
, &scanning_hosts
);
151 spin_unlock(&async_scan_lock
);
153 printk(KERN_INFO
"scsi: waiting for bus probes to complete ...\n");
154 wait_for_completion(&data
->prev_finished
);
156 spin_lock(&async_scan_lock
);
157 list_del(&data
->list
);
158 if (!list_empty(&scanning_hosts
)) {
159 struct async_scan_data
*next
= list_entry(scanning_hosts
.next
,
160 struct async_scan_data
, list
);
161 complete(&next
->prev_finished
);
164 spin_unlock(&async_scan_lock
);
171 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
172 * @sdev: scsi device to send command to
173 * @result: area to store the result of the MODE SENSE
176 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
177 * Called for BLIST_KEY devices.
179 static void scsi_unlock_floptical(struct scsi_device
*sdev
,
180 unsigned char *result
)
182 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
184 sdev_printk(KERN_NOTICE
, sdev
, "unlocking floptical drive\n");
185 scsi_cmd
[0] = MODE_SENSE
;
189 scsi_cmd
[4] = 0x2a; /* size */
191 scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
, result
, 0x2a, NULL
,
192 SCSI_TIMEOUT
, 3, NULL
);
196 * scsi_alloc_sdev - allocate and setup a scsi_Device
197 * @starget: which target to allocate a &scsi_device for
199 * @hostdata: usually NULL and set by ->slave_alloc instead
202 * Allocate, initialize for io, and return a pointer to a scsi_Device.
203 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
204 * adds scsi_Device to the appropriate list.
207 * scsi_Device pointer, or NULL on failure.
209 static struct scsi_device
*scsi_alloc_sdev(struct scsi_target
*starget
,
210 u64 lun
, void *hostdata
)
212 struct scsi_device
*sdev
;
213 int display_failure_msg
= 1, ret
;
214 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
215 extern void scsi_evt_thread(struct work_struct
*work
);
216 extern void scsi_requeue_run_queue(struct work_struct
*work
);
218 sdev
= kzalloc(sizeof(*sdev
) + shost
->transportt
->device_size
,
223 sdev
->vendor
= scsi_null_device_strs
;
224 sdev
->model
= scsi_null_device_strs
;
225 sdev
->rev
= scsi_null_device_strs
;
227 sdev
->queue_ramp_up_period
= SCSI_DEFAULT_RAMP_UP_PERIOD
;
228 sdev
->id
= starget
->id
;
230 sdev
->channel
= starget
->channel
;
231 sdev
->sdev_state
= SDEV_CREATED
;
232 INIT_LIST_HEAD(&sdev
->siblings
);
233 INIT_LIST_HEAD(&sdev
->same_target_siblings
);
234 INIT_LIST_HEAD(&sdev
->cmd_list
);
235 INIT_LIST_HEAD(&sdev
->starved_entry
);
236 INIT_LIST_HEAD(&sdev
->event_list
);
237 spin_lock_init(&sdev
->list_lock
);
238 INIT_WORK(&sdev
->event_work
, scsi_evt_thread
);
239 INIT_WORK(&sdev
->requeue_work
, scsi_requeue_run_queue
);
241 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
242 sdev
->sdev_target
= starget
;
244 /* usually NULL and set by ->slave_alloc instead */
245 sdev
->hostdata
= hostdata
;
247 /* if the device needs this changing, it may do so in the
248 * slave_configure function */
249 sdev
->max_device_blocked
= SCSI_DEFAULT_DEVICE_BLOCKED
;
252 * Some low level driver could use device->type
257 * Assume that the device will have handshaking problems,
258 * and then fix this field later if it turns out it
263 if (shost_use_blk_mq(shost
))
264 sdev
->request_queue
= scsi_mq_alloc_queue(sdev
);
266 sdev
->request_queue
= scsi_alloc_queue(sdev
);
267 if (!sdev
->request_queue
) {
268 /* release fn is set up in scsi_sysfs_device_initialise, so
269 * have to free and put manually here */
270 put_device(&starget
->dev
);
274 WARN_ON_ONCE(!blk_get_queue(sdev
->request_queue
));
275 sdev
->request_queue
->queuedata
= sdev
;
277 if (!shost_use_blk_mq(sdev
->host
) &&
278 (shost
->bqt
|| shost
->hostt
->use_blk_tags
)) {
279 blk_queue_init_tags(sdev
->request_queue
,
280 sdev
->host
->cmd_per_lun
, shost
->bqt
);
282 scsi_change_queue_depth(sdev
, sdev
->host
->cmd_per_lun
);
284 scsi_sysfs_device_initialize(sdev
);
286 if (shost
->hostt
->slave_alloc
) {
287 ret
= shost
->hostt
->slave_alloc(sdev
);
290 * if LLDD reports slave not present, don't clutter
291 * console with alloc failure messages
294 display_failure_msg
= 0;
295 goto out_device_destroy
;
302 __scsi_remove_device(sdev
);
304 if (display_failure_msg
)
305 printk(ALLOC_FAILURE_MSG
, __func__
);
309 static void scsi_target_destroy(struct scsi_target
*starget
)
311 struct device
*dev
= &starget
->dev
;
312 struct Scsi_Host
*shost
= dev_to_shost(dev
->parent
);
315 starget
->state
= STARGET_DEL
;
316 transport_destroy_device(dev
);
317 spin_lock_irqsave(shost
->host_lock
, flags
);
318 if (shost
->hostt
->target_destroy
)
319 shost
->hostt
->target_destroy(starget
);
320 list_del_init(&starget
->siblings
);
321 spin_unlock_irqrestore(shost
->host_lock
, flags
);
325 static void scsi_target_dev_release(struct device
*dev
)
327 struct device
*parent
= dev
->parent
;
328 struct scsi_target
*starget
= to_scsi_target(dev
);
334 static struct device_type scsi_target_type
= {
335 .name
= "scsi_target",
336 .release
= scsi_target_dev_release
,
339 int scsi_is_target_device(const struct device
*dev
)
341 return dev
->type
== &scsi_target_type
;
343 EXPORT_SYMBOL(scsi_is_target_device
);
345 static struct scsi_target
*__scsi_find_target(struct device
*parent
,
346 int channel
, uint id
)
348 struct scsi_target
*starget
, *found_starget
= NULL
;
349 struct Scsi_Host
*shost
= dev_to_shost(parent
);
351 * Search for an existing target for this sdev.
353 list_for_each_entry(starget
, &shost
->__targets
, siblings
) {
354 if (starget
->id
== id
&&
355 starget
->channel
== channel
) {
356 found_starget
= starget
;
361 get_device(&found_starget
->dev
);
363 return found_starget
;
367 * scsi_target_reap_ref_release - remove target from visibility
368 * @kref: the reap_ref in the target being released
370 * Called on last put of reap_ref, which is the indication that no device
371 * under this target is visible anymore, so render the target invisible in
372 * sysfs. Note: we have to be in user context here because the target reaps
373 * should be done in places where the scsi device visibility is being removed.
375 static void scsi_target_reap_ref_release(struct kref
*kref
)
377 struct scsi_target
*starget
378 = container_of(kref
, struct scsi_target
, reap_ref
);
381 * if we get here and the target is still in the CREATED state that
382 * means it was allocated but never made visible (because a scan
383 * turned up no LUNs), so don't call device_del() on it.
385 if (starget
->state
!= STARGET_CREATED
) {
386 transport_remove_device(&starget
->dev
);
387 device_del(&starget
->dev
);
389 scsi_target_destroy(starget
);
392 static void scsi_target_reap_ref_put(struct scsi_target
*starget
)
394 kref_put(&starget
->reap_ref
, scsi_target_reap_ref_release
);
398 * scsi_alloc_target - allocate a new or find an existing target
399 * @parent: parent of the target (need not be a scsi host)
400 * @channel: target channel number (zero if no channels)
401 * @id: target id number
403 * Return an existing target if one exists, provided it hasn't already
404 * gone into STARGET_DEL state, otherwise allocate a new target.
406 * The target is returned with an incremented reference, so the caller
407 * is responsible for both reaping and doing a last put
409 static struct scsi_target
*scsi_alloc_target(struct device
*parent
,
410 int channel
, uint id
)
412 struct Scsi_Host
*shost
= dev_to_shost(parent
);
413 struct device
*dev
= NULL
;
415 const int size
= sizeof(struct scsi_target
)
416 + shost
->transportt
->target_size
;
417 struct scsi_target
*starget
;
418 struct scsi_target
*found_target
;
421 starget
= kzalloc(size
, GFP_KERNEL
);
423 printk(KERN_ERR
"%s: allocation failure\n", __func__
);
427 device_initialize(dev
);
428 kref_init(&starget
->reap_ref
);
429 dev
->parent
= get_device(parent
);
430 dev_set_name(dev
, "target%d:%d:%d", shost
->host_no
, channel
, id
);
431 dev
->bus
= &scsi_bus_type
;
432 dev
->type
= &scsi_target_type
;
434 starget
->channel
= channel
;
435 starget
->can_queue
= 0;
436 INIT_LIST_HEAD(&starget
->siblings
);
437 INIT_LIST_HEAD(&starget
->devices
);
438 starget
->state
= STARGET_CREATED
;
439 starget
->scsi_level
= SCSI_2
;
440 starget
->max_target_blocked
= SCSI_DEFAULT_TARGET_BLOCKED
;
442 spin_lock_irqsave(shost
->host_lock
, flags
);
444 found_target
= __scsi_find_target(parent
, channel
, id
);
448 list_add_tail(&starget
->siblings
, &shost
->__targets
);
449 spin_unlock_irqrestore(shost
->host_lock
, flags
);
450 /* allocate and add */
451 transport_setup_device(dev
);
452 if (shost
->hostt
->target_alloc
) {
453 error
= shost
->hostt
->target_alloc(starget
);
456 dev_printk(KERN_ERR
, dev
, "target allocation failed, error %d\n", error
);
457 /* don't want scsi_target_reap to do the final
458 * put because it will be under the host lock */
459 scsi_target_destroy(starget
);
469 * release routine already fired if kref is zero, so if we can still
470 * take the reference, the target must be alive. If we can't, it must
471 * be dying and we need to wait for a new target
473 ref_got
= kref_get_unless_zero(&found_target
->reap_ref
);
475 spin_unlock_irqrestore(shost
->host_lock
, flags
);
481 * Unfortunately, we found a dying target; need to wait until it's
482 * dead before we can get a new one. There is an anomaly here. We
483 * *should* call scsi_target_reap() to balance the kref_get() of the
484 * reap_ref above. However, since the target being released, it's
485 * already invisible and the reap_ref is irrelevant. If we call
486 * scsi_target_reap() we might spuriously do another device_del() on
487 * an already invisible target.
489 put_device(&found_target
->dev
);
491 * length of time is irrelevant here, we just want to yield the CPU
492 * for a tick to avoid busy waiting for the target to die.
499 * scsi_target_reap - check to see if target is in use and destroy if not
500 * @starget: target to be checked
502 * This is used after removing a LUN or doing a last put of the target
503 * it checks atomically that nothing is using the target and removes
506 void scsi_target_reap(struct scsi_target
*starget
)
509 * serious problem if this triggers: STARGET_DEL is only set in the if
510 * the reap_ref drops to zero, so we're trying to do another final put
511 * on an already released kref
513 BUG_ON(starget
->state
== STARGET_DEL
);
514 scsi_target_reap_ref_put(starget
);
518 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
519 * @s: INQUIRY result string to sanitize
520 * @len: length of the string
523 * The SCSI spec says that INQUIRY vendor, product, and revision
524 * strings must consist entirely of graphic ASCII characters,
525 * padded on the right with spaces. Since not all devices obey
526 * this rule, we will replace non-graphic or non-ASCII characters
527 * with spaces. Exception: a NUL character is interpreted as a
528 * string terminator, so all the following characters are set to
531 static void sanitize_inquiry_string(unsigned char *s
, int len
)
535 for (; len
> 0; (--len
, ++s
)) {
538 if (terminated
|| *s
< 0x20 || *s
> 0x7e)
544 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
545 * @sdev: scsi_device to probe
546 * @inq_result: area to store the INQUIRY result
547 * @result_len: len of inq_result
548 * @bflags: store any bflags found here
551 * Probe the lun associated with @req using a standard SCSI INQUIRY;
553 * If the INQUIRY is successful, zero is returned and the
554 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
555 * are copied to the scsi_device any flags value is stored in *@bflags.
557 static int scsi_probe_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
558 int result_len
, int *bflags
)
560 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
561 int first_inquiry_len
, try_inquiry_len
, next_inquiry_len
;
562 int response_len
= 0;
563 int pass
, count
, result
;
564 struct scsi_sense_hdr sshdr
;
568 /* Perform up to 3 passes. The first pass uses a conservative
569 * transfer length of 36 unless sdev->inquiry_len specifies a
570 * different value. */
571 first_inquiry_len
= sdev
->inquiry_len
? sdev
->inquiry_len
: 36;
572 try_inquiry_len
= first_inquiry_len
;
576 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
577 "scsi scan: INQUIRY pass %d length %d\n",
578 pass
, try_inquiry_len
));
580 /* Each pass gets up to three chances to ignore Unit Attention */
581 for (count
= 0; count
< 3; ++count
) {
584 memset(scsi_cmd
, 0, 6);
585 scsi_cmd
[0] = INQUIRY
;
586 scsi_cmd
[4] = (unsigned char) try_inquiry_len
;
588 memset(inq_result
, 0, try_inquiry_len
);
590 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
591 inq_result
, try_inquiry_len
, &sshdr
,
592 HZ
/ 2 + HZ
* scsi_inq_timeout
, 3,
595 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
596 "scsi scan: INQUIRY %s with code 0x%x\n",
597 result
? "failed" : "successful", result
));
601 * not-ready to ready transition [asc/ascq=0x28/0x0]
602 * or power-on, reset [asc/ascq=0x29/0x0], continue.
603 * INQUIRY should not yield UNIT_ATTENTION
604 * but many buggy devices do so anyway.
606 if ((driver_byte(result
) & DRIVER_SENSE
) &&
607 scsi_sense_valid(&sshdr
)) {
608 if ((sshdr
.sense_key
== UNIT_ATTENTION
) &&
609 ((sshdr
.asc
== 0x28) ||
610 (sshdr
.asc
== 0x29)) &&
616 * if nothing was transferred, we try
617 * again. It's a workaround for some USB
620 if (resid
== try_inquiry_len
)
627 sanitize_inquiry_string(&inq_result
[8], 8);
628 sanitize_inquiry_string(&inq_result
[16], 16);
629 sanitize_inquiry_string(&inq_result
[32], 4);
631 response_len
= inq_result
[4] + 5;
632 if (response_len
> 255)
633 response_len
= first_inquiry_len
; /* sanity */
636 * Get any flags for this device.
638 * XXX add a bflags to scsi_device, and replace the
639 * corresponding bit fields in scsi_device, so bflags
640 * need not be passed as an argument.
642 *bflags
= scsi_get_device_flags(sdev
, &inq_result
[8],
645 /* When the first pass succeeds we gain information about
646 * what larger transfer lengths might work. */
648 if (BLIST_INQUIRY_36
& *bflags
)
649 next_inquiry_len
= 36;
650 else if (BLIST_INQUIRY_58
& *bflags
)
651 next_inquiry_len
= 58;
652 else if (sdev
->inquiry_len
)
653 next_inquiry_len
= sdev
->inquiry_len
;
655 next_inquiry_len
= response_len
;
657 /* If more data is available perform the second pass */
658 if (next_inquiry_len
> try_inquiry_len
) {
659 try_inquiry_len
= next_inquiry_len
;
665 } else if (pass
== 2) {
666 sdev_printk(KERN_INFO
, sdev
,
667 "scsi scan: %d byte inquiry failed. "
668 "Consider BLIST_INQUIRY_36 for this device\n",
671 /* If this pass failed, the third pass goes back and transfers
672 * the same amount as we successfully got in the first pass. */
673 try_inquiry_len
= first_inquiry_len
;
678 /* If the last transfer attempt got an error, assume the
679 * peripheral doesn't exist or is dead. */
683 /* Don't report any more data than the device says is valid */
684 sdev
->inquiry_len
= min(try_inquiry_len
, response_len
);
687 * XXX Abort if the response length is less than 36? If less than
688 * 32, the lookup of the device flags (above) could be invalid,
689 * and it would be possible to take an incorrect action - we do
690 * not want to hang because of a short INQUIRY. On the flip side,
691 * if the device is spun down or becoming ready (and so it gives a
692 * short INQUIRY), an abort here prevents any further use of the
693 * device, including spin up.
695 * On the whole, the best approach seems to be to assume the first
696 * 36 bytes are valid no matter what the device says. That's
697 * better than copying < 36 bytes to the inquiry-result buffer
698 * and displaying garbage for the Vendor, Product, or Revision
701 if (sdev
->inquiry_len
< 36) {
702 sdev_printk(KERN_INFO
, sdev
,
703 "scsi scan: INQUIRY result too short (%d),"
704 " using 36\n", sdev
->inquiry_len
);
705 sdev
->inquiry_len
= 36;
709 * Related to the above issue:
711 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
712 * and if not ready, sent a START_STOP to start (maybe spin up) and
713 * then send the INQUIRY again, since the INQUIRY can change after
714 * a device is initialized.
716 * Ideally, start a device if explicitly asked to do so. This
717 * assumes that a device is spun up on power on, spun down on
718 * request, and then spun up on request.
722 * The scanning code needs to know the scsi_level, even if no
723 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
724 * non-zero LUNs can be scanned.
726 sdev
->scsi_level
= inq_result
[2] & 0x07;
727 if (sdev
->scsi_level
>= 2 ||
728 (sdev
->scsi_level
== 1 && (inq_result
[3] & 0x0f) == 1))
730 sdev
->sdev_target
->scsi_level
= sdev
->scsi_level
;
733 * If SCSI-2 or lower, and if the transport requires it,
734 * store the LUN value in CDB[1].
736 sdev
->lun_in_cdb
= 0;
737 if (sdev
->scsi_level
<= SCSI_2
&&
738 sdev
->scsi_level
!= SCSI_UNKNOWN
&&
739 !sdev
->host
->no_scsi2_lun_in_cdb
)
740 sdev
->lun_in_cdb
= 1;
746 * scsi_add_lun - allocate and fully initialze a scsi_device
747 * @sdev: holds information to be stored in the new scsi_device
748 * @inq_result: holds the result of a previous INQUIRY to the LUN
749 * @bflags: black/white list flag
750 * @async: 1 if this device is being scanned asynchronously
753 * Initialize the scsi_device @sdev. Optionally set fields based
754 * on values in *@bflags.
757 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
758 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
760 static int scsi_add_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
761 int *bflags
, int async
)
766 * XXX do not save the inquiry, since it can change underneath us,
767 * save just vendor/model/rev.
769 * Rather than save it and have an ioctl that retrieves the saved
770 * value, have an ioctl that executes the same INQUIRY code used
771 * in scsi_probe_lun, let user level programs doing INQUIRY
772 * scanning run at their own risk, or supply a user level program
773 * that can correctly scan.
777 * Copy at least 36 bytes of INQUIRY data, so that we don't
778 * dereference unallocated memory when accessing the Vendor,
779 * Product, and Revision strings. Badly behaved devices may set
780 * the INQUIRY Additional Length byte to a small value, indicating
781 * these strings are invalid, but often they contain plausible data
782 * nonetheless. It doesn't matter if the device sent < 36 bytes
783 * total, since scsi_probe_lun() initializes inq_result with 0s.
785 sdev
->inquiry
= kmemdup(inq_result
,
786 max_t(size_t, sdev
->inquiry_len
, 36),
788 if (sdev
->inquiry
== NULL
)
789 return SCSI_SCAN_NO_RESPONSE
;
791 sdev
->vendor
= (char *) (sdev
->inquiry
+ 8);
792 sdev
->model
= (char *) (sdev
->inquiry
+ 16);
793 sdev
->rev
= (char *) (sdev
->inquiry
+ 32);
795 if (strncmp(sdev
->vendor
, "ATA ", 8) == 0) {
797 * sata emulation layer device. This is a hack to work around
798 * the SATL power management specifications which state that
799 * when the SATL detects the device has gone into standby
800 * mode, it shall respond with NOT READY.
802 sdev
->allow_restart
= 1;
805 if (*bflags
& BLIST_ISROM
) {
806 sdev
->type
= TYPE_ROM
;
809 sdev
->type
= (inq_result
[0] & 0x1f);
810 sdev
->removable
= (inq_result
[1] & 0x80) >> 7;
813 * some devices may respond with wrong type for
814 * well-known logical units. Force well-known type
815 * to enumerate them correctly.
817 if (scsi_is_wlun(sdev
->lun
) && sdev
->type
!= TYPE_WLUN
) {
818 sdev_printk(KERN_WARNING
, sdev
,
819 "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n",
820 __func__
, sdev
->type
, (unsigned int)sdev
->lun
);
821 sdev
->type
= TYPE_WLUN
;
826 if (sdev
->type
== TYPE_RBC
|| sdev
->type
== TYPE_ROM
) {
827 /* RBC and MMC devices can return SCSI-3 compliance and yet
828 * still not support REPORT LUNS, so make them act as
829 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
830 * specifically set */
831 if ((*bflags
& BLIST_REPORTLUN2
) == 0)
832 *bflags
|= BLIST_NOREPORTLUN
;
836 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
837 * spec says: The device server is capable of supporting the
838 * specified peripheral device type on this logical unit. However,
839 * the physical device is not currently connected to this logical
842 * The above is vague, as it implies that we could treat 001 and
843 * 011 the same. Stay compatible with previous code, and create a
844 * scsi_device for a PQ of 1
846 * Don't set the device offline here; rather let the upper
847 * level drivers eval the PQ to decide whether they should
848 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
851 sdev
->inq_periph_qual
= (inq_result
[0] >> 5) & 7;
852 sdev
->lockable
= sdev
->removable
;
853 sdev
->soft_reset
= (inq_result
[7] & 1) && ((inq_result
[3] & 7) == 2);
855 if (sdev
->scsi_level
>= SCSI_3
||
856 (sdev
->inquiry_len
> 56 && inq_result
[56] & 0x04))
858 if (inq_result
[7] & 0x60)
860 if (inq_result
[7] & 0x10)
863 sdev_printk(KERN_NOTICE
, sdev
, "%s %.8s %.16s %.4s PQ: %d "
864 "ANSI: %d%s\n", scsi_device_type(sdev
->type
),
865 sdev
->vendor
, sdev
->model
, sdev
->rev
,
866 sdev
->inq_periph_qual
, inq_result
[2] & 0x07,
867 (inq_result
[3] & 0x0f) == 1 ? " CCS" : "");
869 if ((sdev
->scsi_level
>= SCSI_2
) && (inq_result
[7] & 2) &&
870 !(*bflags
& BLIST_NOTQ
)) {
871 sdev
->tagged_supported
= 1;
872 sdev
->simple_tags
= 1;
876 * Some devices (Texel CD ROM drives) have handshaking problems
877 * when used with the Seagate controllers. borken is initialized
878 * to 1, and then set it to 0 here.
880 if ((*bflags
& BLIST_BORKEN
) == 0)
883 if (*bflags
& BLIST_NO_ULD_ATTACH
)
884 sdev
->no_uld_attach
= 1;
887 * Apparently some really broken devices (contrary to the SCSI
888 * standards) need to be selected without asserting ATN
890 if (*bflags
& BLIST_SELECT_NO_ATN
)
891 sdev
->select_no_atn
= 1;
894 * Maximum 512 sector transfer length
895 * broken RA4x00 Compaq Disk Array
897 if (*bflags
& BLIST_MAX_512
)
898 blk_queue_max_hw_sectors(sdev
->request_queue
, 512);
901 * Some devices may not want to have a start command automatically
902 * issued when a device is added.
904 if (*bflags
& BLIST_NOSTARTONADD
)
905 sdev
->no_start_on_add
= 1;
907 if (*bflags
& BLIST_SINGLELUN
)
908 scsi_target(sdev
)->single_lun
= 1;
910 sdev
->use_10_for_rw
= 1;
912 if (*bflags
& BLIST_MS_SKIP_PAGE_08
)
913 sdev
->skip_ms_page_8
= 1;
915 if (*bflags
& BLIST_MS_SKIP_PAGE_3F
)
916 sdev
->skip_ms_page_3f
= 1;
918 if (*bflags
& BLIST_USE_10_BYTE_MS
)
919 sdev
->use_10_for_ms
= 1;
921 /* some devices don't like REPORT SUPPORTED OPERATION CODES
922 * and will simply timeout causing sd_mod init to take a very
924 if (*bflags
& BLIST_NO_RSOC
)
925 sdev
->no_report_opcodes
= 1;
927 /* set the device running here so that slave configure
929 ret
= scsi_device_set_state(sdev
, SDEV_RUNNING
);
931 ret
= scsi_device_set_state(sdev
, SDEV_BLOCK
);
934 sdev_printk(KERN_ERR
, sdev
,
935 "in wrong state %s to complete scan\n",
936 scsi_device_state_name(sdev
->sdev_state
));
937 return SCSI_SCAN_NO_RESPONSE
;
941 if (*bflags
& BLIST_MS_192_BYTES_FOR_3F
)
942 sdev
->use_192_bytes_for_3f
= 1;
944 if (*bflags
& BLIST_NOT_LOCKABLE
)
947 if (*bflags
& BLIST_RETRY_HWERROR
)
948 sdev
->retry_hwerror
= 1;
950 if (*bflags
& BLIST_NO_DIF
)
953 sdev
->eh_timeout
= SCSI_DEFAULT_EH_TIMEOUT
;
955 if (*bflags
& BLIST_TRY_VPD_PAGES
)
956 sdev
->try_vpd_pages
= 1;
957 else if (*bflags
& BLIST_SKIP_VPD_PAGES
)
958 sdev
->skip_vpd_pages
= 1;
960 transport_configure_device(&sdev
->sdev_gendev
);
962 if (sdev
->host
->hostt
->slave_configure
) {
963 ret
= sdev
->host
->hostt
->slave_configure(sdev
);
966 * if LLDD reports slave not present, don't clutter
967 * console with alloc failure messages
970 sdev_printk(KERN_ERR
, sdev
,
971 "failed to configure device\n");
973 return SCSI_SCAN_NO_RESPONSE
;
977 if (sdev
->scsi_level
>= SCSI_3
)
978 scsi_attach_vpd(sdev
);
980 sdev
->max_queue_depth
= sdev
->queue_depth
;
983 * Ok, the device is now all set up, we can
984 * register it and tell the rest of the kernel
987 if (!async
&& scsi_sysfs_add_sdev(sdev
) != 0)
988 return SCSI_SCAN_NO_RESPONSE
;
990 return SCSI_SCAN_LUN_PRESENT
;
993 #ifdef CONFIG_SCSI_LOGGING
995 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
996 * @buf: Output buffer with at least end-first+1 bytes of space
997 * @inq: Inquiry buffer (input)
998 * @first: Offset of string into inq
999 * @end: Index after last character in inq
1001 static unsigned char *scsi_inq_str(unsigned char *buf
, unsigned char *inq
,
1002 unsigned first
, unsigned end
)
1004 unsigned term
= 0, idx
;
1006 for (idx
= 0; idx
+ first
< end
&& idx
+ first
< inq
[4] + 5; idx
++) {
1007 if (inq
[idx
+first
] > ' ') {
1008 buf
[idx
] = inq
[idx
+first
];
1020 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1021 * @starget: pointer to target device structure
1022 * @lun: LUN of target device
1023 * @bflagsp: store bflags here if not NULL
1024 * @sdevp: probe the LUN corresponding to this scsi_device
1025 * @rescan: if nonzero skip some code only needed on first scan
1026 * @hostdata: passed to scsi_alloc_sdev()
1029 * Call scsi_probe_lun, if a LUN with an attached device is found,
1030 * allocate and set it up by calling scsi_add_lun.
1033 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
1034 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1035 * attached at the LUN
1036 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
1038 static int scsi_probe_and_add_lun(struct scsi_target
*starget
,
1039 u64 lun
, int *bflagsp
,
1040 struct scsi_device
**sdevp
, int rescan
,
1043 struct scsi_device
*sdev
;
1044 unsigned char *result
;
1045 int bflags
, res
= SCSI_SCAN_NO_RESPONSE
, result_len
= 256;
1046 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1049 * The rescan flag is used as an optimization, the first scan of a
1050 * host adapter calls into here with rescan == 0.
1052 sdev
= scsi_device_lookup_by_target(starget
, lun
);
1054 if (rescan
|| !scsi_device_created(sdev
)) {
1055 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
1056 "scsi scan: device exists on %s\n",
1057 dev_name(&sdev
->sdev_gendev
)));
1061 scsi_device_put(sdev
);
1064 *bflagsp
= scsi_get_device_flags(sdev
,
1067 return SCSI_SCAN_LUN_PRESENT
;
1069 scsi_device_put(sdev
);
1071 sdev
= scsi_alloc_sdev(starget
, lun
, hostdata
);
1075 result
= kmalloc(result_len
, GFP_ATOMIC
|
1076 ((shost
->unchecked_isa_dma
) ? __GFP_DMA
: 0));
1080 if (scsi_probe_lun(sdev
, result
, result_len
, &bflags
))
1081 goto out_free_result
;
1086 * result contains valid SCSI INQUIRY data.
1088 if (((result
[0] >> 5) == 3) && !(bflags
& BLIST_ATTACH_PQ3
)) {
1090 * For a Peripheral qualifier 3 (011b), the SCSI
1091 * spec says: The device server is not capable of
1092 * supporting a physical device on this logical
1095 * For disks, this implies that there is no
1096 * logical disk configured at sdev->lun, but there
1097 * is a target id responding.
1099 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO
, sdev
, "scsi scan:"
1100 " peripheral qualifier of 3, device not"
1103 SCSI_LOG_SCAN_BUS(1, {
1104 unsigned char vend
[9];
1105 unsigned char mod
[17];
1107 sdev_printk(KERN_INFO
, sdev
,
1108 "scsi scan: consider passing scsi_mod."
1109 "dev_flags=%s:%s:0x240 or 0x1000240\n",
1110 scsi_inq_str(vend
, result
, 8, 16),
1111 scsi_inq_str(mod
, result
, 16, 32));
1116 res
= SCSI_SCAN_TARGET_PRESENT
;
1117 goto out_free_result
;
1121 * Some targets may set slight variations of PQ and PDT to signal
1122 * that no LUN is present, so don't add sdev in these cases.
1123 * Two specific examples are:
1124 * 1) NetApp targets: return PQ=1, PDT=0x1f
1125 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1126 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1129 * 1) SCSI SPC-3, pp. 145-146
1130 * PQ=1: "A peripheral device having the specified peripheral
1131 * device type is not connected to this logical unit. However, the
1132 * device server is capable of supporting the specified peripheral
1133 * device type on this logical unit."
1134 * PDT=0x1f: "Unknown or no device type"
1135 * 2) USB UFI 1.0, p. 20
1136 * PDT=00h Direct-access device (floppy)
1137 * PDT=1Fh none (no FDD connected to the requested logical unit)
1139 if (((result
[0] >> 5) == 1 || starget
->pdt_1f_for_no_lun
) &&
1140 (result
[0] & 0x1f) == 0x1f &&
1141 !scsi_is_wlun(lun
)) {
1142 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
1143 "scsi scan: peripheral device type"
1144 " of 31, no device added\n"));
1145 res
= SCSI_SCAN_TARGET_PRESENT
;
1146 goto out_free_result
;
1149 res
= scsi_add_lun(sdev
, result
, &bflags
, shost
->async_scan
);
1150 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1151 if (bflags
& BLIST_KEY
) {
1153 scsi_unlock_floptical(sdev
, result
);
1160 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1162 if (scsi_device_get(sdev
) == 0) {
1165 __scsi_remove_device(sdev
);
1166 res
= SCSI_SCAN_NO_RESPONSE
;
1170 __scsi_remove_device(sdev
);
1176 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1177 * @starget: pointer to target structure to scan
1178 * @bflags: black/white list flag for LUN 0
1179 * @scsi_level: Which version of the standard does this device adhere to
1180 * @rescan: passed to scsi_probe_add_lun()
1183 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1184 * scanned) to some maximum lun until a LUN is found with no device
1185 * attached. Use the bflags to figure out any oddities.
1187 * Modifies sdevscan->lun.
1189 static void scsi_sequential_lun_scan(struct scsi_target
*starget
,
1190 int bflags
, int scsi_level
, int rescan
)
1193 u64 sparse_lun
, lun
;
1194 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1196 SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO
, starget
,
1197 "scsi scan: Sequential scan\n"));
1199 max_dev_lun
= min(max_scsi_luns
, shost
->max_lun
);
1201 * If this device is known to support sparse multiple units,
1202 * override the other settings, and scan all of them. Normally,
1203 * SCSI-3 devices should be scanned via the REPORT LUNS.
1205 if (bflags
& BLIST_SPARSELUN
) {
1206 max_dev_lun
= shost
->max_lun
;
1212 * If less than SCSI_1_CCS, and no special lun scanning, stop
1213 * scanning; this matches 2.4 behaviour, but could just be a bug
1214 * (to continue scanning a SCSI_1_CCS device).
1216 * This test is broken. We might not have any device on lun0 for
1217 * a sparselun device, and if that's the case then how would we
1218 * know the real scsi_level, eh? It might make sense to just not
1219 * scan any SCSI_1 device for non-0 luns, but that check would best
1220 * go into scsi_alloc_sdev() and just have it return null when asked
1221 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1223 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1224 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1229 * If this device is known to support multiple units, override
1230 * the other settings, and scan all of them.
1232 if (bflags
& BLIST_FORCELUN
)
1233 max_dev_lun
= shost
->max_lun
;
1235 * REGAL CDC-4X: avoid hang after LUN 4
1237 if (bflags
& BLIST_MAX5LUN
)
1238 max_dev_lun
= min(5U, max_dev_lun
);
1240 * Do not scan SCSI-2 or lower device past LUN 7, unless
1243 if (scsi_level
< SCSI_3
&& !(bflags
& BLIST_LARGELUN
))
1244 max_dev_lun
= min(8U, max_dev_lun
);
1247 * Stop scanning at 255 unless BLIST_SCSI3LUN
1249 if (!(bflags
& BLIST_SCSI3LUN
))
1250 max_dev_lun
= min(256U, max_dev_lun
);
1253 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1254 * until we reach the max, or no LUN is found and we are not
1257 for (lun
= 1; lun
< max_dev_lun
; ++lun
)
1258 if ((scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
,
1259 NULL
) != SCSI_SCAN_LUN_PRESENT
) &&
1265 * scsilun_to_int - convert a scsi_lun to an int
1266 * @scsilun: struct scsi_lun to be converted.
1269 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1270 * integer, and return the result. The caller must check for
1271 * truncation before using this function.
1274 * For a description of the LUN format, post SCSI-3 see the SCSI
1275 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1277 * Given a struct scsi_lun of: d2 04 0b 03 00 00 00 00, this function
1278 * returns the integer: 0x0b03d204
1280 * This encoding will return a standard integer LUN for LUNs smaller
1281 * than 256, which typically use a single level LUN structure with
1282 * addressing method 0.
1284 u64
scsilun_to_int(struct scsi_lun
*scsilun
)
1290 for (i
= 0; i
< sizeof(lun
); i
+= 2)
1291 lun
= lun
| (((u64
)scsilun
->scsi_lun
[i
] << ((i
+ 1) * 8)) |
1292 ((u64
)scsilun
->scsi_lun
[i
+ 1] << (i
* 8)));
1295 EXPORT_SYMBOL(scsilun_to_int
);
1298 * int_to_scsilun - reverts an int into a scsi_lun
1299 * @lun: integer to be reverted
1300 * @scsilun: struct scsi_lun to be set.
1303 * Reverts the functionality of the scsilun_to_int, which packed
1304 * an 8-byte lun value into an int. This routine unpacks the int
1305 * back into the lun value.
1308 * Given an integer : 0x0b03d204, this function returns a
1309 * struct scsi_lun of: d2 04 0b 03 00 00 00 00
1312 void int_to_scsilun(u64 lun
, struct scsi_lun
*scsilun
)
1316 memset(scsilun
->scsi_lun
, 0, sizeof(scsilun
->scsi_lun
));
1318 for (i
= 0; i
< sizeof(lun
); i
+= 2) {
1319 scsilun
->scsi_lun
[i
] = (lun
>> 8) & 0xFF;
1320 scsilun
->scsi_lun
[i
+1] = lun
& 0xFF;
1324 EXPORT_SYMBOL(int_to_scsilun
);
1327 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1328 * @starget: which target
1329 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1330 * @rescan: nonzero if we can skip code only needed on first scan
1333 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1334 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
1336 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1337 * LUNs even if it's older than SCSI-3.
1338 * If BLIST_NOREPORTLUN is set, return 1 always.
1339 * If BLIST_NOLUN is set, return 0 always.
1340 * If starget->no_report_luns is set, return 1 always.
1343 * 0: scan completed (or no memory, so further scanning is futile)
1344 * 1: could not scan with REPORT LUN
1346 static int scsi_report_lun_scan(struct scsi_target
*starget
, int bflags
,
1350 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
1351 unsigned int length
;
1353 unsigned int num_luns
;
1354 unsigned int retries
;
1356 struct scsi_lun
*lunp
, *lun_data
;
1357 struct scsi_sense_hdr sshdr
;
1358 struct scsi_device
*sdev
;
1359 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
1363 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1364 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1365 * support more than 8 LUNs.
1366 * Don't attempt if the target doesn't support REPORT LUNS.
1368 if (bflags
& BLIST_NOREPORTLUN
)
1370 if (starget
->scsi_level
< SCSI_2
&&
1371 starget
->scsi_level
!= SCSI_UNKNOWN
)
1373 if (starget
->scsi_level
< SCSI_3
&&
1374 (!(bflags
& BLIST_REPORTLUN2
) || shost
->max_lun
<= 8))
1376 if (bflags
& BLIST_NOLUN
)
1378 if (starget
->no_report_luns
)
1381 if (!(sdev
= scsi_device_lookup_by_target(starget
, 0))) {
1382 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1385 if (scsi_device_get(sdev
)) {
1386 __scsi_remove_device(sdev
);
1391 sprintf(devname
, "host %d channel %d id %d",
1392 shost
->host_no
, sdev
->channel
, sdev
->id
);
1395 * Allocate enough to hold the header (the same size as one scsi_lun)
1396 * plus the number of luns we are requesting. 511 was the default
1397 * value of the now removed max_report_luns parameter.
1399 length
= (511 + 1) * sizeof(struct scsi_lun
);
1401 lun_data
= kmalloc(length
, GFP_KERNEL
|
1402 (sdev
->host
->unchecked_isa_dma
? __GFP_DMA
: 0));
1404 printk(ALLOC_FAILURE_MSG
, __func__
);
1408 scsi_cmd
[0] = REPORT_LUNS
;
1411 * bytes 1 - 5: reserved, set to zero.
1413 memset(&scsi_cmd
[1], 0, 5);
1416 * bytes 6 - 9: length of the command.
1418 put_unaligned_be32(length
, &scsi_cmd
[6]);
1420 scsi_cmd
[10] = 0; /* reserved */
1421 scsi_cmd
[11] = 0; /* control */
1424 * We can get a UNIT ATTENTION, for example a power on/reset, so
1425 * retry a few times (like sd.c does for TEST UNIT READY).
1426 * Experience shows some combinations of adapter/devices get at
1427 * least two power on/resets.
1429 * Illegal requests (for devices that do not support REPORT LUNS)
1430 * should come through as a check condition, and will not generate
1433 for (retries
= 0; retries
< 3; retries
++) {
1434 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1435 "scsi scan: Sending REPORT LUNS to (try %d)\n",
1438 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
1439 lun_data
, length
, &sshdr
,
1440 SCSI_TIMEOUT
+ 4 * HZ
, 3, NULL
);
1442 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1443 "scsi scan: REPORT LUNS"
1444 " %s (try %d) result 0x%x\n",
1445 result
? "failed" : "successful",
1449 else if (scsi_sense_valid(&sshdr
)) {
1450 if (sshdr
.sense_key
!= UNIT_ATTENTION
)
1457 * The device probably does not support a REPORT LUN command
1464 * Get the length from the first four bytes of lun_data.
1466 if (get_unaligned_be32(lun_data
->scsi_lun
) +
1467 sizeof(struct scsi_lun
) > length
) {
1468 length
= get_unaligned_be32(lun_data
->scsi_lun
) +
1469 sizeof(struct scsi_lun
);
1473 length
= get_unaligned_be32(lun_data
->scsi_lun
);
1475 num_luns
= (length
/ sizeof(struct scsi_lun
));
1477 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1478 "scsi scan: REPORT LUN scan\n"));
1481 * Scan the luns in lun_data. The entry at offset 0 is really
1482 * the header, so start at 1 and go up to and including num_luns.
1484 for (lunp
= &lun_data
[1]; lunp
<= &lun_data
[num_luns
]; lunp
++) {
1485 lun
= scsilun_to_int(lunp
);
1487 if (lun
> sdev
->host
->max_lun
) {
1488 sdev_printk(KERN_WARNING
, sdev
,
1489 "lun%llu has a LUN larger than"
1490 " allowed by the host adapter\n", lun
);
1494 res
= scsi_probe_and_add_lun(starget
,
1495 lun
, NULL
, NULL
, rescan
, NULL
);
1496 if (res
== SCSI_SCAN_NO_RESPONSE
) {
1498 * Got some results, but now none, abort.
1500 sdev_printk(KERN_ERR
, sdev
,
1501 "Unexpected response"
1502 " from lun %llu while scanning, scan"
1503 " aborted\n", (unsigned long long)lun
);
1512 scsi_device_put(sdev
);
1513 if (scsi_device_created(sdev
))
1515 * the sdev we used didn't appear in the report luns scan
1517 __scsi_remove_device(sdev
);
1521 struct scsi_device
*__scsi_add_device(struct Scsi_Host
*shost
, uint channel
,
1522 uint id
, u64 lun
, void *hostdata
)
1524 struct scsi_device
*sdev
= ERR_PTR(-ENODEV
);
1525 struct device
*parent
= &shost
->shost_gendev
;
1526 struct scsi_target
*starget
;
1528 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1529 return ERR_PTR(-ENODEV
);
1531 starget
= scsi_alloc_target(parent
, channel
, id
);
1533 return ERR_PTR(-ENOMEM
);
1534 scsi_autopm_get_target(starget
);
1536 mutex_lock(&shost
->scan_mutex
);
1537 if (!shost
->async_scan
)
1538 scsi_complete_async_scans();
1540 if (scsi_host_scan_allowed(shost
) && scsi_autopm_get_host(shost
) == 0) {
1541 scsi_probe_and_add_lun(starget
, lun
, NULL
, &sdev
, 1, hostdata
);
1542 scsi_autopm_put_host(shost
);
1544 mutex_unlock(&shost
->scan_mutex
);
1545 scsi_autopm_put_target(starget
);
1547 * paired with scsi_alloc_target(). Target will be destroyed unless
1548 * scsi_probe_and_add_lun made an underlying device visible
1550 scsi_target_reap(starget
);
1551 put_device(&starget
->dev
);
1555 EXPORT_SYMBOL(__scsi_add_device
);
1557 int scsi_add_device(struct Scsi_Host
*host
, uint channel
,
1558 uint target
, u64 lun
)
1560 struct scsi_device
*sdev
=
1561 __scsi_add_device(host
, channel
, target
, lun
, NULL
);
1563 return PTR_ERR(sdev
);
1565 scsi_device_put(sdev
);
1568 EXPORT_SYMBOL(scsi_add_device
);
1570 void scsi_rescan_device(struct device
*dev
)
1575 if (try_module_get(dev
->driver
->owner
)) {
1576 struct scsi_driver
*drv
= to_scsi_driver(dev
->driver
);
1580 module_put(dev
->driver
->owner
);
1583 EXPORT_SYMBOL(scsi_rescan_device
);
1585 static void __scsi_scan_target(struct device
*parent
, unsigned int channel
,
1586 unsigned int id
, u64 lun
, int rescan
)
1588 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1591 struct scsi_target
*starget
;
1593 if (shost
->this_id
== id
)
1595 * Don't scan the host adapter
1599 starget
= scsi_alloc_target(parent
, channel
, id
);
1602 scsi_autopm_get_target(starget
);
1604 if (lun
!= SCAN_WILD_CARD
) {
1606 * Scan for a specific host/chan/id/lun.
1608 scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
, NULL
);
1613 * Scan LUN 0, if there is some response, scan further. Ideally, we
1614 * would not configure LUN 0 until all LUNs are scanned.
1616 res
= scsi_probe_and_add_lun(starget
, 0, &bflags
, NULL
, rescan
, NULL
);
1617 if (res
== SCSI_SCAN_LUN_PRESENT
|| res
== SCSI_SCAN_TARGET_PRESENT
) {
1618 if (scsi_report_lun_scan(starget
, bflags
, rescan
) != 0)
1620 * The REPORT LUN did not scan the target,
1621 * do a sequential scan.
1623 scsi_sequential_lun_scan(starget
, bflags
,
1624 starget
->scsi_level
, rescan
);
1628 scsi_autopm_put_target(starget
);
1630 * paired with scsi_alloc_target(): determine if the target has
1631 * any children at all and if not, nuke it
1633 scsi_target_reap(starget
);
1635 put_device(&starget
->dev
);
1639 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1640 * @parent: host to scan
1641 * @channel: channel to scan
1642 * @id: target id to scan
1643 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1644 * @rescan: passed to LUN scanning routines
1647 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1648 * and possibly all LUNs on the target id.
1650 * First try a REPORT LUN scan, if that does not scan the target, do a
1651 * sequential scan of LUNs on the target id.
1653 void scsi_scan_target(struct device
*parent
, unsigned int channel
,
1654 unsigned int id
, u64 lun
, int rescan
)
1656 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1658 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1661 mutex_lock(&shost
->scan_mutex
);
1662 if (!shost
->async_scan
)
1663 scsi_complete_async_scans();
1665 if (scsi_host_scan_allowed(shost
) && scsi_autopm_get_host(shost
) == 0) {
1666 __scsi_scan_target(parent
, channel
, id
, lun
, rescan
);
1667 scsi_autopm_put_host(shost
);
1669 mutex_unlock(&shost
->scan_mutex
);
1671 EXPORT_SYMBOL(scsi_scan_target
);
1673 static void scsi_scan_channel(struct Scsi_Host
*shost
, unsigned int channel
,
1674 unsigned int id
, u64 lun
, int rescan
)
1678 if (id
== SCAN_WILD_CARD
)
1679 for (id
= 0; id
< shost
->max_id
; ++id
) {
1681 * XXX adapter drivers when possible (FCP, iSCSI)
1682 * could modify max_id to match the current max,
1683 * not the absolute max.
1685 * XXX add a shost id iterator, so for example,
1686 * the FC ID can be the same as a target id
1687 * without a huge overhead of sparse id's.
1689 if (shost
->reverse_ordering
)
1691 * Scan from high to low id.
1693 order_id
= shost
->max_id
- id
- 1;
1696 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1697 order_id
, lun
, rescan
);
1700 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1704 int scsi_scan_host_selected(struct Scsi_Host
*shost
, unsigned int channel
,
1705 unsigned int id
, u64 lun
, int rescan
)
1707 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO
, shost
,
1708 "%s: <%u:%u:%llu>\n",
1709 __func__
, channel
, id
, lun
));
1711 if (((channel
!= SCAN_WILD_CARD
) && (channel
> shost
->max_channel
)) ||
1712 ((id
!= SCAN_WILD_CARD
) && (id
>= shost
->max_id
)) ||
1713 ((lun
!= SCAN_WILD_CARD
) && (lun
>= shost
->max_lun
)))
1716 mutex_lock(&shost
->scan_mutex
);
1717 if (!shost
->async_scan
)
1718 scsi_complete_async_scans();
1720 if (scsi_host_scan_allowed(shost
) && scsi_autopm_get_host(shost
) == 0) {
1721 if (channel
== SCAN_WILD_CARD
)
1722 for (channel
= 0; channel
<= shost
->max_channel
;
1724 scsi_scan_channel(shost
, channel
, id
, lun
,
1727 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1728 scsi_autopm_put_host(shost
);
1730 mutex_unlock(&shost
->scan_mutex
);
1735 static void scsi_sysfs_add_devices(struct Scsi_Host
*shost
)
1737 struct scsi_device
*sdev
;
1738 shost_for_each_device(sdev
, shost
) {
1739 /* target removed before the device could be added */
1740 if (sdev
->sdev_state
== SDEV_DEL
)
1742 /* If device is already visible, skip adding it to sysfs */
1743 if (sdev
->is_visible
)
1745 if (!scsi_host_scan_allowed(shost
) ||
1746 scsi_sysfs_add_sdev(sdev
) != 0)
1747 __scsi_remove_device(sdev
);
1752 * scsi_prep_async_scan - prepare for an async scan
1753 * @shost: the host which will be scanned
1754 * Returns: a cookie to be passed to scsi_finish_async_scan()
1756 * Tells the midlayer this host is going to do an asynchronous scan.
1757 * It reserves the host's position in the scanning list and ensures
1758 * that other asynchronous scans started after this one won't affect the
1759 * ordering of the discovered devices.
1761 static struct async_scan_data
*scsi_prep_async_scan(struct Scsi_Host
*shost
)
1763 struct async_scan_data
*data
;
1764 unsigned long flags
;
1766 if (strncmp(scsi_scan_type
, "sync", 4) == 0)
1769 if (shost
->async_scan
) {
1770 shost_printk(KERN_INFO
, shost
, "%s called twice\n", __func__
);
1775 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
1778 data
->shost
= scsi_host_get(shost
);
1781 init_completion(&data
->prev_finished
);
1783 mutex_lock(&shost
->scan_mutex
);
1784 spin_lock_irqsave(shost
->host_lock
, flags
);
1785 shost
->async_scan
= 1;
1786 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1787 mutex_unlock(&shost
->scan_mutex
);
1789 spin_lock(&async_scan_lock
);
1790 if (list_empty(&scanning_hosts
))
1791 complete(&data
->prev_finished
);
1792 list_add_tail(&data
->list
, &scanning_hosts
);
1793 spin_unlock(&async_scan_lock
);
1803 * scsi_finish_async_scan - asynchronous scan has finished
1804 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1806 * All the devices currently attached to this host have been found.
1807 * This function announces all the devices it has found to the rest
1810 static void scsi_finish_async_scan(struct async_scan_data
*data
)
1812 struct Scsi_Host
*shost
;
1813 unsigned long flags
;
1818 shost
= data
->shost
;
1820 mutex_lock(&shost
->scan_mutex
);
1822 if (!shost
->async_scan
) {
1823 shost_printk(KERN_INFO
, shost
, "%s called twice\n", __func__
);
1825 mutex_unlock(&shost
->scan_mutex
);
1829 wait_for_completion(&data
->prev_finished
);
1831 scsi_sysfs_add_devices(shost
);
1833 spin_lock_irqsave(shost
->host_lock
, flags
);
1834 shost
->async_scan
= 0;
1835 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1837 mutex_unlock(&shost
->scan_mutex
);
1839 spin_lock(&async_scan_lock
);
1840 list_del(&data
->list
);
1841 if (!list_empty(&scanning_hosts
)) {
1842 struct async_scan_data
*next
= list_entry(scanning_hosts
.next
,
1843 struct async_scan_data
, list
);
1844 complete(&next
->prev_finished
);
1846 spin_unlock(&async_scan_lock
);
1848 scsi_autopm_put_host(shost
);
1849 scsi_host_put(shost
);
1853 static void do_scsi_scan_host(struct Scsi_Host
*shost
)
1855 if (shost
->hostt
->scan_finished
) {
1856 unsigned long start
= jiffies
;
1857 if (shost
->hostt
->scan_start
)
1858 shost
->hostt
->scan_start(shost
);
1860 while (!shost
->hostt
->scan_finished(shost
, jiffies
- start
))
1863 scsi_scan_host_selected(shost
, SCAN_WILD_CARD
, SCAN_WILD_CARD
,
1868 static void do_scan_async(void *_data
, async_cookie_t c
)
1870 struct async_scan_data
*data
= _data
;
1871 struct Scsi_Host
*shost
= data
->shost
;
1873 do_scsi_scan_host(shost
);
1874 scsi_finish_async_scan(data
);
1878 * scsi_scan_host - scan the given adapter
1879 * @shost: adapter to scan
1881 void scsi_scan_host(struct Scsi_Host
*shost
)
1883 struct async_scan_data
*data
;
1885 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1887 if (scsi_autopm_get_host(shost
) < 0)
1890 data
= scsi_prep_async_scan(shost
);
1892 do_scsi_scan_host(shost
);
1893 scsi_autopm_put_host(shost
);
1897 /* register with the async subsystem so wait_for_device_probe()
1898 * will flush this work
1900 async_schedule(do_scan_async
, data
);
1902 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
1904 EXPORT_SYMBOL(scsi_scan_host
);
1906 void scsi_forget_host(struct Scsi_Host
*shost
)
1908 struct scsi_device
*sdev
;
1909 unsigned long flags
;
1912 spin_lock_irqsave(shost
->host_lock
, flags
);
1913 list_for_each_entry(sdev
, &shost
->__devices
, siblings
) {
1914 if (sdev
->sdev_state
== SDEV_DEL
)
1916 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1917 __scsi_remove_device(sdev
);
1920 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1924 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1925 * @shost: Host that needs a scsi_device
1927 * Lock status: None assumed.
1929 * Returns: The scsi_device or NULL
1932 * Attach a single scsi_device to the Scsi_Host - this should
1933 * be made to look like a "pseudo-device" that points to the
1936 * Note - this device is not accessible from any high-level
1937 * drivers (including generics), which is probably not
1938 * optimal. We can add hooks later to attach.
1940 struct scsi_device
*scsi_get_host_dev(struct Scsi_Host
*shost
)
1942 struct scsi_device
*sdev
= NULL
;
1943 struct scsi_target
*starget
;
1945 mutex_lock(&shost
->scan_mutex
);
1946 if (!scsi_host_scan_allowed(shost
))
1948 starget
= scsi_alloc_target(&shost
->shost_gendev
, 0, shost
->this_id
);
1952 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1956 scsi_target_reap(starget
);
1957 put_device(&starget
->dev
);
1959 mutex_unlock(&shost
->scan_mutex
);
1962 EXPORT_SYMBOL(scsi_get_host_dev
);
1965 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1966 * @sdev: Host device to be freed
1968 * Lock status: None assumed.
1972 void scsi_free_host_dev(struct scsi_device
*sdev
)
1974 BUG_ON(sdev
->id
!= sdev
->host
->this_id
);
1976 __scsi_remove_device(sdev
);
1978 EXPORT_SYMBOL(scsi_free_host_dev
);