1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2000 Eric Youngdale,
6 * Copyright (C) 2002 Patrick Mansfield
8 * The general scanning/probing algorithm is as follows, exceptions are
9 * made to it depending on device specific flags, compilation options, and
10 * global variable (boot or module load time) settings.
12 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
13 * device attached, a scsi_device is allocated and setup for it.
15 * For every id of every channel on the given host:
17 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
18 * device or storage attached to LUN 0):
20 * If LUN 0 has a device attached, allocate and setup a
23 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
24 * all of the LUNs returned by the REPORT LUN; else,
25 * sequentially scan LUNs up until some maximum is reached,
26 * or a LUN is seen that cannot have a device attached to it.
29 #include <linux/module.h>
30 #include <linux/moduleparam.h>
31 #include <linux/init.h>
32 #include <linux/blkdev.h>
33 #include <linux/delay.h>
34 #include <linux/kthread.h>
35 #include <linux/spinlock.h>
36 #include <linux/async.h>
37 #include <linux/slab.h>
38 #include <asm/unaligned.h>
40 #include <scsi/scsi.h>
41 #include <scsi/scsi_cmnd.h>
42 #include <scsi/scsi_device.h>
43 #include <scsi/scsi_driver.h>
44 #include <scsi/scsi_devinfo.h>
45 #include <scsi/scsi_host.h>
46 #include <scsi/scsi_transport.h>
47 #include <scsi/scsi_dh.h>
48 #include <scsi/scsi_eh.h>
50 #include "scsi_priv.h"
51 #include "scsi_logging.h"
53 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
54 " SCSI scanning, some SCSI devices might not be configured\n"
59 #define SCSI_TIMEOUT (2*HZ)
60 #define SCSI_REPORT_LUNS_TIMEOUT (30*HZ)
63 * Prefix values for the SCSI id's (stored in sysfs name field)
65 #define SCSI_UID_SER_NUM 'S'
66 #define SCSI_UID_UNKNOWN 'Z'
69 * Return values of some of the scanning functions.
71 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
72 * includes allocation or general failures preventing IO from being sent.
74 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
77 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
80 #define SCSI_SCAN_NO_RESPONSE 0
81 #define SCSI_SCAN_TARGET_PRESENT 1
82 #define SCSI_SCAN_LUN_PRESENT 2
84 static const char *scsi_null_device_strs
= "nullnullnullnull";
86 #define MAX_SCSI_LUNS 512
88 static u64 max_scsi_luns
= MAX_SCSI_LUNS
;
90 module_param_named(max_luns
, max_scsi_luns
, ullong
, S_IRUGO
|S_IWUSR
);
91 MODULE_PARM_DESC(max_luns
,
92 "last scsi LUN (should be between 1 and 2^64-1)");
94 #ifdef CONFIG_SCSI_SCAN_ASYNC
95 #define SCSI_SCAN_TYPE_DEFAULT "async"
97 #define SCSI_SCAN_TYPE_DEFAULT "sync"
100 char scsi_scan_type
[7] = SCSI_SCAN_TYPE_DEFAULT
;
102 module_param_string(scan
, scsi_scan_type
, sizeof(scsi_scan_type
),
104 MODULE_PARM_DESC(scan
, "sync, async, manual, or none. "
105 "Setting to 'manual' disables automatic scanning, but allows "
106 "for manual device scan via the 'scan' sysfs attribute.");
108 static unsigned int scsi_inq_timeout
= SCSI_TIMEOUT
/HZ
+ 18;
110 module_param_named(inq_timeout
, scsi_inq_timeout
, uint
, S_IRUGO
|S_IWUSR
);
111 MODULE_PARM_DESC(inq_timeout
,
112 "Timeout (in seconds) waiting for devices to answer INQUIRY."
113 " Default is 20. Some devices may need more; most need less.");
115 /* This lock protects only this list */
116 static DEFINE_SPINLOCK(async_scan_lock
);
117 static LIST_HEAD(scanning_hosts
);
119 struct async_scan_data
{
120 struct list_head list
;
121 struct Scsi_Host
*shost
;
122 struct completion prev_finished
;
126 * scsi_complete_async_scans - Wait for asynchronous scans to complete
128 * When this function returns, any host which started scanning before
129 * this function was called will have finished its scan. Hosts which
130 * started scanning after this function was called may or may not have
133 int scsi_complete_async_scans(void)
135 struct async_scan_data
*data
;
138 if (list_empty(&scanning_hosts
))
140 /* If we can't get memory immediately, that's OK. Just
141 * sleep a little. Even if we never get memory, the async
142 * scans will finish eventually.
144 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
150 init_completion(&data
->prev_finished
);
152 spin_lock(&async_scan_lock
);
153 /* Check that there's still somebody else on the list */
154 if (list_empty(&scanning_hosts
))
156 list_add_tail(&data
->list
, &scanning_hosts
);
157 spin_unlock(&async_scan_lock
);
159 printk(KERN_INFO
"scsi: waiting for bus probes to complete ...\n");
160 wait_for_completion(&data
->prev_finished
);
162 spin_lock(&async_scan_lock
);
163 list_del(&data
->list
);
164 if (!list_empty(&scanning_hosts
)) {
165 struct async_scan_data
*next
= list_entry(scanning_hosts
.next
,
166 struct async_scan_data
, list
);
167 complete(&next
->prev_finished
);
170 spin_unlock(&async_scan_lock
);
177 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
178 * @sdev: scsi device to send command to
179 * @result: area to store the result of the MODE SENSE
182 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
183 * Called for BLIST_KEY devices.
185 static void scsi_unlock_floptical(struct scsi_device
*sdev
,
186 unsigned char *result
)
188 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
190 sdev_printk(KERN_NOTICE
, sdev
, "unlocking floptical drive\n");
191 scsi_cmd
[0] = MODE_SENSE
;
195 scsi_cmd
[4] = 0x2a; /* size */
197 scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
, result
, 0x2a, NULL
,
198 SCSI_TIMEOUT
, 3, NULL
);
202 * scsi_alloc_sdev - allocate and setup a scsi_Device
203 * @starget: which target to allocate a &scsi_device for
205 * @hostdata: usually NULL and set by ->slave_alloc instead
208 * Allocate, initialize for io, and return a pointer to a scsi_Device.
209 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
210 * adds scsi_Device to the appropriate list.
213 * scsi_Device pointer, or NULL on failure.
215 static struct scsi_device
*scsi_alloc_sdev(struct scsi_target
*starget
,
216 u64 lun
, void *hostdata
)
218 struct scsi_device
*sdev
;
219 int display_failure_msg
= 1, ret
;
220 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
222 sdev
= kzalloc(sizeof(*sdev
) + shost
->transportt
->device_size
,
227 sdev
->vendor
= scsi_null_device_strs
;
228 sdev
->model
= scsi_null_device_strs
;
229 sdev
->rev
= scsi_null_device_strs
;
231 sdev
->queue_ramp_up_period
= SCSI_DEFAULT_RAMP_UP_PERIOD
;
232 sdev
->id
= starget
->id
;
234 sdev
->channel
= starget
->channel
;
235 mutex_init(&sdev
->state_mutex
);
236 sdev
->sdev_state
= SDEV_CREATED
;
237 INIT_LIST_HEAD(&sdev
->siblings
);
238 INIT_LIST_HEAD(&sdev
->same_target_siblings
);
239 INIT_LIST_HEAD(&sdev
->starved_entry
);
240 INIT_LIST_HEAD(&sdev
->event_list
);
241 spin_lock_init(&sdev
->list_lock
);
242 mutex_init(&sdev
->inquiry_mutex
);
243 INIT_WORK(&sdev
->event_work
, scsi_evt_thread
);
244 INIT_WORK(&sdev
->requeue_work
, scsi_requeue_run_queue
);
246 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
247 sdev
->sdev_target
= starget
;
249 /* usually NULL and set by ->slave_alloc instead */
250 sdev
->hostdata
= hostdata
;
252 /* if the device needs this changing, it may do so in the
253 * slave_configure function */
254 sdev
->max_device_blocked
= SCSI_DEFAULT_DEVICE_BLOCKED
;
257 * Some low level driver could use device->type
262 * Assume that the device will have handshaking problems,
263 * and then fix this field later if it turns out it
268 sdev
->request_queue
= scsi_mq_alloc_queue(sdev
);
269 if (!sdev
->request_queue
) {
270 /* release fn is set up in scsi_sysfs_device_initialise, so
271 * have to free and put manually here */
272 put_device(&starget
->dev
);
276 WARN_ON_ONCE(!blk_get_queue(sdev
->request_queue
));
277 sdev
->request_queue
->queuedata
= sdev
;
279 scsi_change_queue_depth(sdev
, sdev
->host
->cmd_per_lun
?
280 sdev
->host
->cmd_per_lun
: 1);
282 scsi_sysfs_device_initialize(sdev
);
284 if (shost
->hostt
->slave_alloc
) {
285 ret
= shost
->hostt
->slave_alloc(sdev
);
288 * if LLDD reports slave not present, don't clutter
289 * console with alloc failure messages
292 display_failure_msg
= 0;
293 goto out_device_destroy
;
300 __scsi_remove_device(sdev
);
302 if (display_failure_msg
)
303 printk(ALLOC_FAILURE_MSG
, __func__
);
307 static void scsi_target_destroy(struct scsi_target
*starget
)
309 struct device
*dev
= &starget
->dev
;
310 struct Scsi_Host
*shost
= dev_to_shost(dev
->parent
);
313 BUG_ON(starget
->state
== STARGET_DEL
);
314 starget
->state
= STARGET_DEL
;
315 transport_destroy_device(dev
);
316 spin_lock_irqsave(shost
->host_lock
, flags
);
317 if (shost
->hostt
->target_destroy
)
318 shost
->hostt
->target_destroy(starget
);
319 list_del_init(&starget
->siblings
);
320 spin_unlock_irqrestore(shost
->host_lock
, flags
);
324 static void scsi_target_dev_release(struct device
*dev
)
326 struct device
*parent
= dev
->parent
;
327 struct scsi_target
*starget
= to_scsi_target(dev
);
333 static struct device_type scsi_target_type
= {
334 .name
= "scsi_target",
335 .release
= scsi_target_dev_release
,
338 int scsi_is_target_device(const struct device
*dev
)
340 return dev
->type
== &scsi_target_type
;
342 EXPORT_SYMBOL(scsi_is_target_device
);
344 static struct scsi_target
*__scsi_find_target(struct device
*parent
,
345 int channel
, uint id
)
347 struct scsi_target
*starget
, *found_starget
= NULL
;
348 struct Scsi_Host
*shost
= dev_to_shost(parent
);
350 * Search for an existing target for this sdev.
352 list_for_each_entry(starget
, &shost
->__targets
, siblings
) {
353 if (starget
->id
== id
&&
354 starget
->channel
== channel
) {
355 found_starget
= starget
;
360 get_device(&found_starget
->dev
);
362 return found_starget
;
366 * scsi_target_reap_ref_release - remove target from visibility
367 * @kref: the reap_ref in the target being released
369 * Called on last put of reap_ref, which is the indication that no device
370 * under this target is visible anymore, so render the target invisible in
371 * sysfs. Note: we have to be in user context here because the target reaps
372 * should be done in places where the scsi device visibility is being removed.
374 static void scsi_target_reap_ref_release(struct kref
*kref
)
376 struct scsi_target
*starget
377 = container_of(kref
, struct scsi_target
, reap_ref
);
380 * if we get here and the target is still in a CREATED state that
381 * means it was allocated but never made visible (because a scan
382 * turned up no LUNs), so don't call device_del() on it.
384 if ((starget
->state
!= STARGET_CREATED
) &&
385 (starget
->state
!= STARGET_CREATED_REMOVE
)) {
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 * scsi_sanitize_inquiry_string - remove non-graphical chars from an
519 * INQUIRY result string
520 * @s: INQUIRY result string to sanitize
521 * @len: length of the string
524 * The SCSI spec says that INQUIRY vendor, product, and revision
525 * strings must consist entirely of graphic ASCII characters,
526 * padded on the right with spaces. Since not all devices obey
527 * this rule, we will replace non-graphic or non-ASCII characters
528 * with spaces. Exception: a NUL character is interpreted as a
529 * string terminator, so all the following characters are set to
532 void scsi_sanitize_inquiry_string(unsigned char *s
, int len
)
536 for (; len
> 0; (--len
, ++s
)) {
539 if (terminated
|| *s
< 0x20 || *s
> 0x7e)
543 EXPORT_SYMBOL(scsi_sanitize_inquiry_string
);
546 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
547 * @sdev: scsi_device to probe
548 * @inq_result: area to store the INQUIRY result
549 * @result_len: len of inq_result
550 * @bflags: store any bflags found here
553 * Probe the lun associated with @req using a standard SCSI INQUIRY;
555 * If the INQUIRY is successful, zero is returned and the
556 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
557 * are copied to the scsi_device any flags value is stored in *@bflags.
559 static int scsi_probe_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
560 int result_len
, blist_flags_t
*bflags
)
562 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
563 int first_inquiry_len
, try_inquiry_len
, next_inquiry_len
;
564 int response_len
= 0;
565 int pass
, count
, result
;
566 struct scsi_sense_hdr sshdr
;
570 /* Perform up to 3 passes. The first pass uses a conservative
571 * transfer length of 36 unless sdev->inquiry_len specifies a
572 * different value. */
573 first_inquiry_len
= sdev
->inquiry_len
? sdev
->inquiry_len
: 36;
574 try_inquiry_len
= first_inquiry_len
;
578 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
579 "scsi scan: INQUIRY pass %d length %d\n",
580 pass
, try_inquiry_len
));
582 /* Each pass gets up to three chances to ignore Unit Attention */
583 for (count
= 0; count
< 3; ++count
) {
586 memset(scsi_cmd
, 0, 6);
587 scsi_cmd
[0] = INQUIRY
;
588 scsi_cmd
[4] = (unsigned char) try_inquiry_len
;
590 memset(inq_result
, 0, try_inquiry_len
);
592 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
593 inq_result
, try_inquiry_len
, &sshdr
,
594 HZ
/ 2 + HZ
* scsi_inq_timeout
, 3,
597 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
598 "scsi scan: INQUIRY %s with code 0x%x\n",
599 result
? "failed" : "successful", result
));
603 * not-ready to ready transition [asc/ascq=0x28/0x0]
604 * or power-on, reset [asc/ascq=0x29/0x0], continue.
605 * INQUIRY should not yield UNIT_ATTENTION
606 * but many buggy devices do so anyway.
608 if (driver_byte(result
) == DRIVER_SENSE
&&
609 scsi_sense_valid(&sshdr
)) {
610 if ((sshdr
.sense_key
== UNIT_ATTENTION
) &&
611 ((sshdr
.asc
== 0x28) ||
612 (sshdr
.asc
== 0x29)) &&
618 * if nothing was transferred, we try
619 * again. It's a workaround for some USB
622 if (resid
== try_inquiry_len
)
629 scsi_sanitize_inquiry_string(&inq_result
[8], 8);
630 scsi_sanitize_inquiry_string(&inq_result
[16], 16);
631 scsi_sanitize_inquiry_string(&inq_result
[32], 4);
633 response_len
= inq_result
[4] + 5;
634 if (response_len
> 255)
635 response_len
= first_inquiry_len
; /* sanity */
638 * Get any flags for this device.
640 * XXX add a bflags to scsi_device, and replace the
641 * corresponding bit fields in scsi_device, so bflags
642 * need not be passed as an argument.
644 *bflags
= scsi_get_device_flags(sdev
, &inq_result
[8],
647 /* When the first pass succeeds we gain information about
648 * what larger transfer lengths might work. */
650 if (BLIST_INQUIRY_36
& *bflags
)
651 next_inquiry_len
= 36;
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 if (!sdev
->host
->short_inquiry
) {
703 shost_printk(KERN_INFO
, sdev
->host
,
704 "scsi scan: INQUIRY result too short (%d),"
705 " using 36\n", sdev
->inquiry_len
);
706 sdev
->host
->short_inquiry
= 1;
708 sdev
->inquiry_len
= 36;
712 * Related to the above issue:
714 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
715 * and if not ready, sent a START_STOP to start (maybe spin up) and
716 * then send the INQUIRY again, since the INQUIRY can change after
717 * a device is initialized.
719 * Ideally, start a device if explicitly asked to do so. This
720 * assumes that a device is spun up on power on, spun down on
721 * request, and then spun up on request.
725 * The scanning code needs to know the scsi_level, even if no
726 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
727 * non-zero LUNs can be scanned.
729 sdev
->scsi_level
= inq_result
[2] & 0x07;
730 if (sdev
->scsi_level
>= 2 ||
731 (sdev
->scsi_level
== 1 && (inq_result
[3] & 0x0f) == 1))
733 sdev
->sdev_target
->scsi_level
= sdev
->scsi_level
;
736 * If SCSI-2 or lower, and if the transport requires it,
737 * store the LUN value in CDB[1].
739 sdev
->lun_in_cdb
= 0;
740 if (sdev
->scsi_level
<= SCSI_2
&&
741 sdev
->scsi_level
!= SCSI_UNKNOWN
&&
742 !sdev
->host
->no_scsi2_lun_in_cdb
)
743 sdev
->lun_in_cdb
= 1;
749 * scsi_add_lun - allocate and fully initialze a scsi_device
750 * @sdev: holds information to be stored in the new scsi_device
751 * @inq_result: holds the result of a previous INQUIRY to the LUN
752 * @bflags: black/white list flag
753 * @async: 1 if this device is being scanned asynchronously
756 * Initialize the scsi_device @sdev. Optionally set fields based
757 * on values in *@bflags.
760 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
761 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
763 static int scsi_add_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
764 blist_flags_t
*bflags
, int async
)
769 * XXX do not save the inquiry, since it can change underneath us,
770 * save just vendor/model/rev.
772 * Rather than save it and have an ioctl that retrieves the saved
773 * value, have an ioctl that executes the same INQUIRY code used
774 * in scsi_probe_lun, let user level programs doing INQUIRY
775 * scanning run at their own risk, or supply a user level program
776 * that can correctly scan.
780 * Copy at least 36 bytes of INQUIRY data, so that we don't
781 * dereference unallocated memory when accessing the Vendor,
782 * Product, and Revision strings. Badly behaved devices may set
783 * the INQUIRY Additional Length byte to a small value, indicating
784 * these strings are invalid, but often they contain plausible data
785 * nonetheless. It doesn't matter if the device sent < 36 bytes
786 * total, since scsi_probe_lun() initializes inq_result with 0s.
788 sdev
->inquiry
= kmemdup(inq_result
,
789 max_t(size_t, sdev
->inquiry_len
, 36),
791 if (sdev
->inquiry
== NULL
)
792 return SCSI_SCAN_NO_RESPONSE
;
794 sdev
->vendor
= (char *) (sdev
->inquiry
+ 8);
795 sdev
->model
= (char *) (sdev
->inquiry
+ 16);
796 sdev
->rev
= (char *) (sdev
->inquiry
+ 32);
798 if (strncmp(sdev
->vendor
, "ATA ", 8) == 0) {
800 * sata emulation layer device. This is a hack to work around
801 * the SATL power management specifications which state that
802 * when the SATL detects the device has gone into standby
803 * mode, it shall respond with NOT READY.
805 sdev
->allow_restart
= 1;
808 if (*bflags
& BLIST_ISROM
) {
809 sdev
->type
= TYPE_ROM
;
812 sdev
->type
= (inq_result
[0] & 0x1f);
813 sdev
->removable
= (inq_result
[1] & 0x80) >> 7;
816 * some devices may respond with wrong type for
817 * well-known logical units. Force well-known type
818 * to enumerate them correctly.
820 if (scsi_is_wlun(sdev
->lun
) && sdev
->type
!= TYPE_WLUN
) {
821 sdev_printk(KERN_WARNING
, sdev
,
822 "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n",
823 __func__
, sdev
->type
, (unsigned int)sdev
->lun
);
824 sdev
->type
= TYPE_WLUN
;
829 if (sdev
->type
== TYPE_RBC
|| sdev
->type
== TYPE_ROM
) {
830 /* RBC and MMC devices can return SCSI-3 compliance and yet
831 * still not support REPORT LUNS, so make them act as
832 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
833 * specifically set */
834 if ((*bflags
& BLIST_REPORTLUN2
) == 0)
835 *bflags
|= BLIST_NOREPORTLUN
;
839 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
840 * spec says: The device server is capable of supporting the
841 * specified peripheral device type on this logical unit. However,
842 * the physical device is not currently connected to this logical
845 * The above is vague, as it implies that we could treat 001 and
846 * 011 the same. Stay compatible with previous code, and create a
847 * scsi_device for a PQ of 1
849 * Don't set the device offline here; rather let the upper
850 * level drivers eval the PQ to decide whether they should
851 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
854 sdev
->inq_periph_qual
= (inq_result
[0] >> 5) & 7;
855 sdev
->lockable
= sdev
->removable
;
856 sdev
->soft_reset
= (inq_result
[7] & 1) && ((inq_result
[3] & 7) == 2);
858 if (sdev
->scsi_level
>= SCSI_3
||
859 (sdev
->inquiry_len
> 56 && inq_result
[56] & 0x04))
861 if (inq_result
[7] & 0x60)
863 if (inq_result
[7] & 0x10)
866 sdev_printk(KERN_NOTICE
, sdev
, "%s %.8s %.16s %.4s PQ: %d "
867 "ANSI: %d%s\n", scsi_device_type(sdev
->type
),
868 sdev
->vendor
, sdev
->model
, sdev
->rev
,
869 sdev
->inq_periph_qual
, inq_result
[2] & 0x07,
870 (inq_result
[3] & 0x0f) == 1 ? " CCS" : "");
872 if ((sdev
->scsi_level
>= SCSI_2
) && (inq_result
[7] & 2) &&
873 !(*bflags
& BLIST_NOTQ
)) {
874 sdev
->tagged_supported
= 1;
875 sdev
->simple_tags
= 1;
879 * Some devices (Texel CD ROM drives) have handshaking problems
880 * when used with the Seagate controllers. borken is initialized
881 * to 1, and then set it to 0 here.
883 if ((*bflags
& BLIST_BORKEN
) == 0)
886 if (*bflags
& BLIST_NO_ULD_ATTACH
)
887 sdev
->no_uld_attach
= 1;
890 * Apparently some really broken devices (contrary to the SCSI
891 * standards) need to be selected without asserting ATN
893 if (*bflags
& BLIST_SELECT_NO_ATN
)
894 sdev
->select_no_atn
= 1;
897 * Maximum 512 sector transfer length
898 * broken RA4x00 Compaq Disk Array
900 if (*bflags
& BLIST_MAX_512
)
901 blk_queue_max_hw_sectors(sdev
->request_queue
, 512);
903 * Max 1024 sector transfer length for targets that report incorrect
904 * max/optimal lengths and relied on the old block layer safe default
906 else if (*bflags
& BLIST_MAX_1024
)
907 blk_queue_max_hw_sectors(sdev
->request_queue
, 1024);
910 * Some devices may not want to have a start command automatically
911 * issued when a device is added.
913 if (*bflags
& BLIST_NOSTARTONADD
)
914 sdev
->no_start_on_add
= 1;
916 if (*bflags
& BLIST_SINGLELUN
)
917 scsi_target(sdev
)->single_lun
= 1;
919 sdev
->use_10_for_rw
= 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 mutex_lock(&sdev
->state_mutex
);
930 ret
= scsi_device_set_state(sdev
, SDEV_RUNNING
);
932 ret
= scsi_device_set_state(sdev
, SDEV_BLOCK
);
933 mutex_unlock(&sdev
->state_mutex
);
936 sdev_printk(KERN_ERR
, sdev
,
937 "in wrong state %s to complete scan\n",
938 scsi_device_state_name(sdev
->sdev_state
));
939 return SCSI_SCAN_NO_RESPONSE
;
942 if (*bflags
& BLIST_NOT_LOCKABLE
)
945 if (*bflags
& BLIST_RETRY_HWERROR
)
946 sdev
->retry_hwerror
= 1;
948 if (*bflags
& BLIST_NO_DIF
)
951 if (*bflags
& BLIST_UNMAP_LIMIT_WS
)
952 sdev
->unmap_limit_for_ws
= 1;
954 sdev
->eh_timeout
= SCSI_DEFAULT_EH_TIMEOUT
;
956 if (*bflags
& BLIST_TRY_VPD_PAGES
)
957 sdev
->try_vpd_pages
= 1;
958 else if (*bflags
& BLIST_SKIP_VPD_PAGES
)
959 sdev
->skip_vpd_pages
= 1;
961 transport_configure_device(&sdev
->sdev_gendev
);
963 if (sdev
->host
->hostt
->slave_configure
) {
964 ret
= sdev
->host
->hostt
->slave_configure(sdev
);
967 * if LLDD reports slave not present, don't clutter
968 * console with alloc failure messages
971 sdev_printk(KERN_ERR
, sdev
,
972 "failed to configure device\n");
974 return SCSI_SCAN_NO_RESPONSE
;
978 if (sdev
->scsi_level
>= SCSI_3
)
979 scsi_attach_vpd(sdev
);
981 sdev
->max_queue_depth
= sdev
->queue_depth
;
982 sdev
->sdev_bflags
= *bflags
;
985 * Ok, the device is now all set up, we can
986 * register it and tell the rest of the kernel
989 if (!async
&& scsi_sysfs_add_sdev(sdev
) != 0)
990 return SCSI_SCAN_NO_RESPONSE
;
992 return SCSI_SCAN_LUN_PRESENT
;
995 #ifdef CONFIG_SCSI_LOGGING
997 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
998 * @buf: Output buffer with at least end-first+1 bytes of space
999 * @inq: Inquiry buffer (input)
1000 * @first: Offset of string into inq
1001 * @end: Index after last character in inq
1003 static unsigned char *scsi_inq_str(unsigned char *buf
, unsigned char *inq
,
1004 unsigned first
, unsigned end
)
1006 unsigned term
= 0, idx
;
1008 for (idx
= 0; idx
+ first
< end
&& idx
+ first
< inq
[4] + 5; idx
++) {
1009 if (inq
[idx
+first
] > ' ') {
1010 buf
[idx
] = inq
[idx
+first
];
1022 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1023 * @starget: pointer to target device structure
1024 * @lun: LUN of target device
1025 * @bflagsp: store bflags here if not NULL
1026 * @sdevp: probe the LUN corresponding to this scsi_device
1027 * @rescan: if not equal to SCSI_SCAN_INITIAL skip some code only
1028 * needed on first scan
1029 * @hostdata: passed to scsi_alloc_sdev()
1032 * Call scsi_probe_lun, if a LUN with an attached device is found,
1033 * allocate and set it up by calling scsi_add_lun.
1037 * - SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
1038 * - SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1039 * attached at the LUN
1040 * - SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
1042 static int scsi_probe_and_add_lun(struct scsi_target
*starget
,
1043 u64 lun
, blist_flags_t
*bflagsp
,
1044 struct scsi_device
**sdevp
,
1045 enum scsi_scan_mode rescan
,
1048 struct scsi_device
*sdev
;
1049 unsigned char *result
;
1050 blist_flags_t bflags
;
1051 int res
= SCSI_SCAN_NO_RESPONSE
, result_len
= 256;
1052 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1055 * The rescan flag is used as an optimization, the first scan of a
1056 * host adapter calls into here with rescan == 0.
1058 sdev
= scsi_device_lookup_by_target(starget
, lun
);
1060 if (rescan
!= SCSI_SCAN_INITIAL
|| !scsi_device_created(sdev
)) {
1061 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
1062 "scsi scan: device exists on %s\n",
1063 dev_name(&sdev
->sdev_gendev
)));
1067 scsi_device_put(sdev
);
1070 *bflagsp
= scsi_get_device_flags(sdev
,
1073 return SCSI_SCAN_LUN_PRESENT
;
1075 scsi_device_put(sdev
);
1077 sdev
= scsi_alloc_sdev(starget
, lun
, hostdata
);
1081 result
= kmalloc(result_len
, GFP_KERNEL
|
1082 ((shost
->unchecked_isa_dma
) ? __GFP_DMA
: 0));
1086 if (scsi_probe_lun(sdev
, result
, result_len
, &bflags
))
1087 goto out_free_result
;
1092 * result contains valid SCSI INQUIRY data.
1094 if ((result
[0] >> 5) == 3) {
1096 * For a Peripheral qualifier 3 (011b), the SCSI
1097 * spec says: The device server is not capable of
1098 * supporting a physical device on this logical
1101 * For disks, this implies that there is no
1102 * logical disk configured at sdev->lun, but there
1103 * is a target id responding.
1105 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO
, sdev
, "scsi scan:"
1106 " peripheral qualifier of 3, device not"
1109 SCSI_LOG_SCAN_BUS(1, {
1110 unsigned char vend
[9];
1111 unsigned char mod
[17];
1113 sdev_printk(KERN_INFO
, sdev
,
1114 "scsi scan: consider passing scsi_mod."
1115 "dev_flags=%s:%s:0x240 or 0x1000240\n",
1116 scsi_inq_str(vend
, result
, 8, 16),
1117 scsi_inq_str(mod
, result
, 16, 32));
1122 res
= SCSI_SCAN_TARGET_PRESENT
;
1123 goto out_free_result
;
1127 * Some targets may set slight variations of PQ and PDT to signal
1128 * that no LUN is present, so don't add sdev in these cases.
1129 * Two specific examples are:
1130 * 1) NetApp targets: return PQ=1, PDT=0x1f
1131 * 2) IBM/2145 targets: return PQ=1, PDT=0
1132 * 3) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1133 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1136 * 1) SCSI SPC-3, pp. 145-146
1137 * PQ=1: "A peripheral device having the specified peripheral
1138 * device type is not connected to this logical unit. However, the
1139 * device server is capable of supporting the specified peripheral
1140 * device type on this logical unit."
1141 * PDT=0x1f: "Unknown or no device type"
1142 * 2) USB UFI 1.0, p. 20
1143 * PDT=00h Direct-access device (floppy)
1144 * PDT=1Fh none (no FDD connected to the requested logical unit)
1146 if (((result
[0] >> 5) == 1 ||
1147 (starget
->pdt_1f_for_no_lun
&& (result
[0] & 0x1f) == 0x1f)) &&
1148 !scsi_is_wlun(lun
)) {
1149 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
1150 "scsi scan: peripheral device type"
1151 " of 31, no device added\n"));
1152 res
= SCSI_SCAN_TARGET_PRESENT
;
1153 goto out_free_result
;
1156 res
= scsi_add_lun(sdev
, result
, &bflags
, shost
->async_scan
);
1157 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1158 if (bflags
& BLIST_KEY
) {
1160 scsi_unlock_floptical(sdev
, result
);
1167 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1169 if (scsi_device_get(sdev
) == 0) {
1172 __scsi_remove_device(sdev
);
1173 res
= SCSI_SCAN_NO_RESPONSE
;
1177 __scsi_remove_device(sdev
);
1183 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1184 * @starget: pointer to target structure to scan
1185 * @bflags: black/white list flag for LUN 0
1186 * @scsi_level: Which version of the standard does this device adhere to
1187 * @rescan: passed to scsi_probe_add_lun()
1190 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1191 * scanned) to some maximum lun until a LUN is found with no device
1192 * attached. Use the bflags to figure out any oddities.
1194 * Modifies sdevscan->lun.
1196 static void scsi_sequential_lun_scan(struct scsi_target
*starget
,
1197 blist_flags_t bflags
, int scsi_level
,
1198 enum scsi_scan_mode rescan
)
1201 u64 sparse_lun
, lun
;
1202 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1204 SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO
, starget
,
1205 "scsi scan: Sequential scan\n"));
1207 max_dev_lun
= min(max_scsi_luns
, shost
->max_lun
);
1209 * If this device is known to support sparse multiple units,
1210 * override the other settings, and scan all of them. Normally,
1211 * SCSI-3 devices should be scanned via the REPORT LUNS.
1213 if (bflags
& BLIST_SPARSELUN
) {
1214 max_dev_lun
= shost
->max_lun
;
1220 * If less than SCSI_1_CCS, and no special lun scanning, stop
1221 * scanning; this matches 2.4 behaviour, but could just be a bug
1222 * (to continue scanning a SCSI_1_CCS device).
1224 * This test is broken. We might not have any device on lun0 for
1225 * a sparselun device, and if that's the case then how would we
1226 * know the real scsi_level, eh? It might make sense to just not
1227 * scan any SCSI_1 device for non-0 luns, but that check would best
1228 * go into scsi_alloc_sdev() and just have it return null when asked
1229 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1231 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1232 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1237 * If this device is known to support multiple units, override
1238 * the other settings, and scan all of them.
1240 if (bflags
& BLIST_FORCELUN
)
1241 max_dev_lun
= shost
->max_lun
;
1243 * REGAL CDC-4X: avoid hang after LUN 4
1245 if (bflags
& BLIST_MAX5LUN
)
1246 max_dev_lun
= min(5U, max_dev_lun
);
1248 * Do not scan SCSI-2 or lower device past LUN 7, unless
1251 if (scsi_level
< SCSI_3
&& !(bflags
& BLIST_LARGELUN
))
1252 max_dev_lun
= min(8U, max_dev_lun
);
1254 max_dev_lun
= min(256U, max_dev_lun
);
1257 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1258 * until we reach the max, or no LUN is found and we are not
1261 for (lun
= 1; lun
< max_dev_lun
; ++lun
)
1262 if ((scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
,
1263 NULL
) != SCSI_SCAN_LUN_PRESENT
) &&
1269 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1270 * @starget: which target
1271 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1272 * @rescan: nonzero if we can skip code only needed on first scan
1275 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1276 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
1278 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1279 * LUNs even if it's older than SCSI-3.
1280 * If BLIST_NOREPORTLUN is set, return 1 always.
1281 * If BLIST_NOLUN is set, return 0 always.
1282 * If starget->no_report_luns is set, return 1 always.
1285 * 0: scan completed (or no memory, so further scanning is futile)
1286 * 1: could not scan with REPORT LUN
1288 static int scsi_report_lun_scan(struct scsi_target
*starget
, blist_flags_t bflags
,
1289 enum scsi_scan_mode rescan
)
1291 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
1292 unsigned int length
;
1294 unsigned int num_luns
;
1295 unsigned int retries
;
1297 struct scsi_lun
*lunp
, *lun_data
;
1298 struct scsi_sense_hdr sshdr
;
1299 struct scsi_device
*sdev
;
1300 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
1304 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1305 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1306 * support more than 8 LUNs.
1307 * Don't attempt if the target doesn't support REPORT LUNS.
1309 if (bflags
& BLIST_NOREPORTLUN
)
1311 if (starget
->scsi_level
< SCSI_2
&&
1312 starget
->scsi_level
!= SCSI_UNKNOWN
)
1314 if (starget
->scsi_level
< SCSI_3
&&
1315 (!(bflags
& BLIST_REPORTLUN2
) || shost
->max_lun
<= 8))
1317 if (bflags
& BLIST_NOLUN
)
1319 if (starget
->no_report_luns
)
1322 if (!(sdev
= scsi_device_lookup_by_target(starget
, 0))) {
1323 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1326 if (scsi_device_get(sdev
)) {
1327 __scsi_remove_device(sdev
);
1333 * Allocate enough to hold the header (the same size as one scsi_lun)
1334 * plus the number of luns we are requesting. 511 was the default
1335 * value of the now removed max_report_luns parameter.
1337 length
= (511 + 1) * sizeof(struct scsi_lun
);
1339 lun_data
= kmalloc(length
, GFP_KERNEL
|
1340 (sdev
->host
->unchecked_isa_dma
? __GFP_DMA
: 0));
1342 printk(ALLOC_FAILURE_MSG
, __func__
);
1346 scsi_cmd
[0] = REPORT_LUNS
;
1349 * bytes 1 - 5: reserved, set to zero.
1351 memset(&scsi_cmd
[1], 0, 5);
1354 * bytes 6 - 9: length of the command.
1356 put_unaligned_be32(length
, &scsi_cmd
[6]);
1358 scsi_cmd
[10] = 0; /* reserved */
1359 scsi_cmd
[11] = 0; /* control */
1362 * We can get a UNIT ATTENTION, for example a power on/reset, so
1363 * retry a few times (like sd.c does for TEST UNIT READY).
1364 * Experience shows some combinations of adapter/devices get at
1365 * least two power on/resets.
1367 * Illegal requests (for devices that do not support REPORT LUNS)
1368 * should come through as a check condition, and will not generate
1371 for (retries
= 0; retries
< 3; retries
++) {
1372 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1373 "scsi scan: Sending REPORT LUNS to (try %d)\n",
1376 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
1377 lun_data
, length
, &sshdr
,
1378 SCSI_REPORT_LUNS_TIMEOUT
, 3, NULL
);
1380 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1381 "scsi scan: REPORT LUNS"
1382 " %s (try %d) result 0x%x\n",
1383 result
? "failed" : "successful",
1387 else if (scsi_sense_valid(&sshdr
)) {
1388 if (sshdr
.sense_key
!= UNIT_ATTENTION
)
1395 * The device probably does not support a REPORT LUN command
1402 * Get the length from the first four bytes of lun_data.
1404 if (get_unaligned_be32(lun_data
->scsi_lun
) +
1405 sizeof(struct scsi_lun
) > length
) {
1406 length
= get_unaligned_be32(lun_data
->scsi_lun
) +
1407 sizeof(struct scsi_lun
);
1411 length
= get_unaligned_be32(lun_data
->scsi_lun
);
1413 num_luns
= (length
/ sizeof(struct scsi_lun
));
1415 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1416 "scsi scan: REPORT LUN scan\n"));
1419 * Scan the luns in lun_data. The entry at offset 0 is really
1420 * the header, so start at 1 and go up to and including num_luns.
1422 for (lunp
= &lun_data
[1]; lunp
<= &lun_data
[num_luns
]; lunp
++) {
1423 lun
= scsilun_to_int(lunp
);
1425 if (lun
> sdev
->host
->max_lun
) {
1426 sdev_printk(KERN_WARNING
, sdev
,
1427 "lun%llu has a LUN larger than"
1428 " allowed by the host adapter\n", lun
);
1432 res
= scsi_probe_and_add_lun(starget
,
1433 lun
, NULL
, NULL
, rescan
, NULL
);
1434 if (res
== SCSI_SCAN_NO_RESPONSE
) {
1436 * Got some results, but now none, abort.
1438 sdev_printk(KERN_ERR
, sdev
,
1439 "Unexpected response"
1440 " from lun %llu while scanning, scan"
1441 " aborted\n", (unsigned long long)lun
);
1450 if (scsi_device_created(sdev
))
1452 * the sdev we used didn't appear in the report luns scan
1454 __scsi_remove_device(sdev
);
1455 scsi_device_put(sdev
);
1459 struct scsi_device
*__scsi_add_device(struct Scsi_Host
*shost
, uint channel
,
1460 uint id
, u64 lun
, void *hostdata
)
1462 struct scsi_device
*sdev
= ERR_PTR(-ENODEV
);
1463 struct device
*parent
= &shost
->shost_gendev
;
1464 struct scsi_target
*starget
;
1466 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1467 return ERR_PTR(-ENODEV
);
1469 starget
= scsi_alloc_target(parent
, channel
, id
);
1471 return ERR_PTR(-ENOMEM
);
1472 scsi_autopm_get_target(starget
);
1474 mutex_lock(&shost
->scan_mutex
);
1475 if (!shost
->async_scan
)
1476 scsi_complete_async_scans();
1478 if (scsi_host_scan_allowed(shost
) && scsi_autopm_get_host(shost
) == 0) {
1479 scsi_probe_and_add_lun(starget
, lun
, NULL
, &sdev
, 1, hostdata
);
1480 scsi_autopm_put_host(shost
);
1482 mutex_unlock(&shost
->scan_mutex
);
1483 scsi_autopm_put_target(starget
);
1485 * paired with scsi_alloc_target(). Target will be destroyed unless
1486 * scsi_probe_and_add_lun made an underlying device visible
1488 scsi_target_reap(starget
);
1489 put_device(&starget
->dev
);
1493 EXPORT_SYMBOL(__scsi_add_device
);
1495 int scsi_add_device(struct Scsi_Host
*host
, uint channel
,
1496 uint target
, u64 lun
)
1498 struct scsi_device
*sdev
=
1499 __scsi_add_device(host
, channel
, target
, lun
, NULL
);
1501 return PTR_ERR(sdev
);
1503 scsi_device_put(sdev
);
1506 EXPORT_SYMBOL(scsi_add_device
);
1508 void scsi_rescan_device(struct device
*dev
)
1510 struct scsi_device
*sdev
= to_scsi_device(dev
);
1514 scsi_attach_vpd(sdev
);
1516 if (sdev
->handler
&& sdev
->handler
->rescan
)
1517 sdev
->handler
->rescan(sdev
);
1519 if (dev
->driver
&& try_module_get(dev
->driver
->owner
)) {
1520 struct scsi_driver
*drv
= to_scsi_driver(dev
->driver
);
1524 module_put(dev
->driver
->owner
);
1528 EXPORT_SYMBOL(scsi_rescan_device
);
1530 static void __scsi_scan_target(struct device
*parent
, unsigned int channel
,
1531 unsigned int id
, u64 lun
, enum scsi_scan_mode rescan
)
1533 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1534 blist_flags_t bflags
= 0;
1536 struct scsi_target
*starget
;
1538 if (shost
->this_id
== id
)
1540 * Don't scan the host adapter
1544 starget
= scsi_alloc_target(parent
, channel
, id
);
1547 scsi_autopm_get_target(starget
);
1549 if (lun
!= SCAN_WILD_CARD
) {
1551 * Scan for a specific host/chan/id/lun.
1553 scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
, NULL
);
1558 * Scan LUN 0, if there is some response, scan further. Ideally, we
1559 * would not configure LUN 0 until all LUNs are scanned.
1561 res
= scsi_probe_and_add_lun(starget
, 0, &bflags
, NULL
, rescan
, NULL
);
1562 if (res
== SCSI_SCAN_LUN_PRESENT
|| res
== SCSI_SCAN_TARGET_PRESENT
) {
1563 if (scsi_report_lun_scan(starget
, bflags
, rescan
) != 0)
1565 * The REPORT LUN did not scan the target,
1566 * do a sequential scan.
1568 scsi_sequential_lun_scan(starget
, bflags
,
1569 starget
->scsi_level
, rescan
);
1573 scsi_autopm_put_target(starget
);
1575 * paired with scsi_alloc_target(): determine if the target has
1576 * any children at all and if not, nuke it
1578 scsi_target_reap(starget
);
1580 put_device(&starget
->dev
);
1584 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1585 * @parent: host to scan
1586 * @channel: channel to scan
1587 * @id: target id to scan
1588 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1589 * @rescan: passed to LUN scanning routines; SCSI_SCAN_INITIAL for
1590 * no rescan, SCSI_SCAN_RESCAN to rescan existing LUNs,
1591 * and SCSI_SCAN_MANUAL to force scanning even if
1592 * 'scan=manual' is set.
1595 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1596 * and possibly all LUNs on the target id.
1598 * First try a REPORT LUN scan, if that does not scan the target, do a
1599 * sequential scan of LUNs on the target id.
1601 void scsi_scan_target(struct device
*parent
, unsigned int channel
,
1602 unsigned int id
, u64 lun
, enum scsi_scan_mode rescan
)
1604 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1606 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1609 if (rescan
!= SCSI_SCAN_MANUAL
&&
1610 strncmp(scsi_scan_type
, "manual", 6) == 0)
1613 mutex_lock(&shost
->scan_mutex
);
1614 if (!shost
->async_scan
)
1615 scsi_complete_async_scans();
1617 if (scsi_host_scan_allowed(shost
) && scsi_autopm_get_host(shost
) == 0) {
1618 __scsi_scan_target(parent
, channel
, id
, lun
, rescan
);
1619 scsi_autopm_put_host(shost
);
1621 mutex_unlock(&shost
->scan_mutex
);
1623 EXPORT_SYMBOL(scsi_scan_target
);
1625 static void scsi_scan_channel(struct Scsi_Host
*shost
, unsigned int channel
,
1626 unsigned int id
, u64 lun
,
1627 enum scsi_scan_mode rescan
)
1631 if (id
== SCAN_WILD_CARD
)
1632 for (id
= 0; id
< shost
->max_id
; ++id
) {
1634 * XXX adapter drivers when possible (FCP, iSCSI)
1635 * could modify max_id to match the current max,
1636 * not the absolute max.
1638 * XXX add a shost id iterator, so for example,
1639 * the FC ID can be the same as a target id
1640 * without a huge overhead of sparse id's.
1642 if (shost
->reverse_ordering
)
1644 * Scan from high to low id.
1646 order_id
= shost
->max_id
- id
- 1;
1649 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1650 order_id
, lun
, rescan
);
1653 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1657 int scsi_scan_host_selected(struct Scsi_Host
*shost
, unsigned int channel
,
1658 unsigned int id
, u64 lun
,
1659 enum scsi_scan_mode rescan
)
1661 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO
, shost
,
1662 "%s: <%u:%u:%llu>\n",
1663 __func__
, channel
, id
, lun
));
1665 if (((channel
!= SCAN_WILD_CARD
) && (channel
> shost
->max_channel
)) ||
1666 ((id
!= SCAN_WILD_CARD
) && (id
>= shost
->max_id
)) ||
1667 ((lun
!= SCAN_WILD_CARD
) && (lun
>= shost
->max_lun
)))
1670 mutex_lock(&shost
->scan_mutex
);
1671 if (!shost
->async_scan
)
1672 scsi_complete_async_scans();
1674 if (scsi_host_scan_allowed(shost
) && scsi_autopm_get_host(shost
) == 0) {
1675 if (channel
== SCAN_WILD_CARD
)
1676 for (channel
= 0; channel
<= shost
->max_channel
;
1678 scsi_scan_channel(shost
, channel
, id
, lun
,
1681 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1682 scsi_autopm_put_host(shost
);
1684 mutex_unlock(&shost
->scan_mutex
);
1689 static void scsi_sysfs_add_devices(struct Scsi_Host
*shost
)
1691 struct scsi_device
*sdev
;
1692 shost_for_each_device(sdev
, shost
) {
1693 /* target removed before the device could be added */
1694 if (sdev
->sdev_state
== SDEV_DEL
)
1696 /* If device is already visible, skip adding it to sysfs */
1697 if (sdev
->is_visible
)
1699 if (!scsi_host_scan_allowed(shost
) ||
1700 scsi_sysfs_add_sdev(sdev
) != 0)
1701 __scsi_remove_device(sdev
);
1706 * scsi_prep_async_scan - prepare for an async scan
1707 * @shost: the host which will be scanned
1708 * Returns: a cookie to be passed to scsi_finish_async_scan()
1710 * Tells the midlayer this host is going to do an asynchronous scan.
1711 * It reserves the host's position in the scanning list and ensures
1712 * that other asynchronous scans started after this one won't affect the
1713 * ordering of the discovered devices.
1715 static struct async_scan_data
*scsi_prep_async_scan(struct Scsi_Host
*shost
)
1717 struct async_scan_data
*data
= NULL
;
1718 unsigned long flags
;
1720 if (strncmp(scsi_scan_type
, "sync", 4) == 0)
1723 mutex_lock(&shost
->scan_mutex
);
1724 if (shost
->async_scan
) {
1725 shost_printk(KERN_DEBUG
, shost
, "%s called twice\n", __func__
);
1729 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
1732 data
->shost
= scsi_host_get(shost
);
1735 init_completion(&data
->prev_finished
);
1737 spin_lock_irqsave(shost
->host_lock
, flags
);
1738 shost
->async_scan
= 1;
1739 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1740 mutex_unlock(&shost
->scan_mutex
);
1742 spin_lock(&async_scan_lock
);
1743 if (list_empty(&scanning_hosts
))
1744 complete(&data
->prev_finished
);
1745 list_add_tail(&data
->list
, &scanning_hosts
);
1746 spin_unlock(&async_scan_lock
);
1751 mutex_unlock(&shost
->scan_mutex
);
1757 * scsi_finish_async_scan - asynchronous scan has finished
1758 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1760 * All the devices currently attached to this host have been found.
1761 * This function announces all the devices it has found to the rest
1764 static void scsi_finish_async_scan(struct async_scan_data
*data
)
1766 struct Scsi_Host
*shost
;
1767 unsigned long flags
;
1772 shost
= data
->shost
;
1774 mutex_lock(&shost
->scan_mutex
);
1776 if (!shost
->async_scan
) {
1777 shost_printk(KERN_INFO
, shost
, "%s called twice\n", __func__
);
1779 mutex_unlock(&shost
->scan_mutex
);
1783 wait_for_completion(&data
->prev_finished
);
1785 scsi_sysfs_add_devices(shost
);
1787 spin_lock_irqsave(shost
->host_lock
, flags
);
1788 shost
->async_scan
= 0;
1789 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1791 mutex_unlock(&shost
->scan_mutex
);
1793 spin_lock(&async_scan_lock
);
1794 list_del(&data
->list
);
1795 if (!list_empty(&scanning_hosts
)) {
1796 struct async_scan_data
*next
= list_entry(scanning_hosts
.next
,
1797 struct async_scan_data
, list
);
1798 complete(&next
->prev_finished
);
1800 spin_unlock(&async_scan_lock
);
1802 scsi_autopm_put_host(shost
);
1803 scsi_host_put(shost
);
1807 static void do_scsi_scan_host(struct Scsi_Host
*shost
)
1809 if (shost
->hostt
->scan_finished
) {
1810 unsigned long start
= jiffies
;
1811 if (shost
->hostt
->scan_start
)
1812 shost
->hostt
->scan_start(shost
);
1814 while (!shost
->hostt
->scan_finished(shost
, jiffies
- start
))
1817 scsi_scan_host_selected(shost
, SCAN_WILD_CARD
, SCAN_WILD_CARD
,
1822 static void do_scan_async(void *_data
, async_cookie_t c
)
1824 struct async_scan_data
*data
= _data
;
1825 struct Scsi_Host
*shost
= data
->shost
;
1827 do_scsi_scan_host(shost
);
1828 scsi_finish_async_scan(data
);
1832 * scsi_scan_host - scan the given adapter
1833 * @shost: adapter to scan
1835 void scsi_scan_host(struct Scsi_Host
*shost
)
1837 struct async_scan_data
*data
;
1839 if (strncmp(scsi_scan_type
, "none", 4) == 0 ||
1840 strncmp(scsi_scan_type
, "manual", 6) == 0)
1842 if (scsi_autopm_get_host(shost
) < 0)
1845 data
= scsi_prep_async_scan(shost
);
1847 do_scsi_scan_host(shost
);
1848 scsi_autopm_put_host(shost
);
1852 /* register with the async subsystem so wait_for_device_probe()
1853 * will flush this work
1855 async_schedule(do_scan_async
, data
);
1857 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
1859 EXPORT_SYMBOL(scsi_scan_host
);
1861 void scsi_forget_host(struct Scsi_Host
*shost
)
1863 struct scsi_device
*sdev
;
1864 unsigned long flags
;
1867 spin_lock_irqsave(shost
->host_lock
, flags
);
1868 list_for_each_entry(sdev
, &shost
->__devices
, siblings
) {
1869 if (sdev
->sdev_state
== SDEV_DEL
)
1871 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1872 __scsi_remove_device(sdev
);
1875 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1879 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1880 * @shost: Host that needs a scsi_device
1882 * Lock status: None assumed.
1884 * Returns: The scsi_device or NULL
1887 * Attach a single scsi_device to the Scsi_Host - this should
1888 * be made to look like a "pseudo-device" that points to the
1891 * Note - this device is not accessible from any high-level
1892 * drivers (including generics), which is probably not
1893 * optimal. We can add hooks later to attach.
1895 struct scsi_device
*scsi_get_host_dev(struct Scsi_Host
*shost
)
1897 struct scsi_device
*sdev
= NULL
;
1898 struct scsi_target
*starget
;
1900 mutex_lock(&shost
->scan_mutex
);
1901 if (!scsi_host_scan_allowed(shost
))
1903 starget
= scsi_alloc_target(&shost
->shost_gendev
, 0, shost
->this_id
);
1907 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1911 scsi_target_reap(starget
);
1912 put_device(&starget
->dev
);
1914 mutex_unlock(&shost
->scan_mutex
);
1917 EXPORT_SYMBOL(scsi_get_host_dev
);
1920 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1921 * @sdev: Host device to be freed
1923 * Lock status: None assumed.
1927 void scsi_free_host_dev(struct scsi_device
*sdev
)
1929 BUG_ON(sdev
->id
!= sdev
->host
->this_id
);
1931 __scsi_remove_device(sdev
);
1933 EXPORT_SYMBOL(scsi_free_host_dev
);