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 static 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_enable_async_suspend - Enable async suspend and resume
128 void scsi_enable_async_suspend(struct device *dev)
131 * If a user has disabled async probing a likely reason is due to a
132 * storage enclosure that does not inject staggered spin-ups. For
133 * safety, make resume synchronous as well in that case.
135 if (strncmp(scsi_scan_type, "async", 5) != 0)
137 /* Enable asynchronous suspend and resume. */
138 device_enable_async_suspend(dev);
142 * scsi_complete_async_scans - Wait for asynchronous scans to complete
144 * When this function returns, any host which started scanning before
145 * this function was called will have finished its scan. Hosts which
146 * started scanning after this function was called may or may not have
149 int scsi_complete_async_scans(void)
151 struct async_scan_data *data;
154 if (list_empty(&scanning_hosts))
156 /* If we can't get memory immediately, that's OK. Just
157 * sleep a little. Even if we never get memory, the async
158 * scans will finish eventually.
160 data = kmalloc(sizeof(*data), GFP_KERNEL);
166 init_completion(&data->prev_finished);
168 spin_lock(&async_scan_lock);
169 /* Check that there's still somebody else on the list */
170 if (list_empty(&scanning_hosts))
172 list_add_tail(&data->list, &scanning_hosts);
173 spin_unlock(&async_scan_lock);
175 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
176 wait_for_completion(&data->prev_finished);
178 spin_lock(&async_scan_lock);
179 list_del(&data->list);
180 if (!list_empty(&scanning_hosts)) {
181 struct async_scan_data *next = list_entry(scanning_hosts.next,
182 struct async_scan_data, list);
183 complete(&next->prev_finished);
186 spin_unlock(&async_scan_lock);
193 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
194 * @sdev: scsi device to send command to
195 * @result: area to store the result of the MODE SENSE
198 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
199 * Called for BLIST_KEY devices.
201 static void scsi_unlock_floptical(struct scsi_device *sdev,
202 unsigned char *result)
204 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
206 sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n");
207 scsi_cmd[0] = MODE_SENSE;
211 scsi_cmd[4] = 0x2a; /* size */
213 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
214 SCSI_TIMEOUT, 3, NULL);
217 static int scsi_realloc_sdev_budget_map(struct scsi_device *sdev,
220 int new_shift = sbitmap_calculate_shift(depth);
221 bool need_alloc = !sdev->budget_map.map;
222 bool need_free = false;
224 struct sbitmap sb_backup;
227 * realloc if new shift is calculated, which is caused by setting
228 * up one new default queue depth after calling ->slave_configure
230 if (!need_alloc && new_shift != sdev->budget_map.shift)
231 need_alloc = need_free = true;
237 * Request queue has to be frozen for reallocating budget map,
238 * and here disk isn't added yet, so freezing is pretty fast
241 blk_mq_freeze_queue(sdev->request_queue);
242 sb_backup = sdev->budget_map;
244 ret = sbitmap_init_node(&sdev->budget_map,
245 scsi_device_max_queue_depth(sdev),
246 new_shift, GFP_KERNEL,
247 sdev->request_queue->node, false, true);
250 sdev->budget_map = sb_backup;
252 sbitmap_free(&sb_backup);
254 blk_mq_unfreeze_queue(sdev->request_queue);
260 * scsi_alloc_sdev - allocate and setup a scsi_Device
261 * @starget: which target to allocate a &scsi_device for
263 * @hostdata: usually NULL and set by ->slave_alloc instead
266 * Allocate, initialize for io, and return a pointer to a scsi_Device.
267 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
268 * adds scsi_Device to the appropriate list.
271 * scsi_Device pointer, or NULL on failure.
273 static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
274 u64 lun, void *hostdata)
277 struct scsi_device *sdev;
278 struct request_queue *q;
279 int display_failure_msg = 1, ret;
280 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
282 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
287 sdev->vendor = scsi_null_device_strs;
288 sdev->model = scsi_null_device_strs;
289 sdev->rev = scsi_null_device_strs;
291 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
292 sdev->id = starget->id;
294 sdev->channel = starget->channel;
295 mutex_init(&sdev->state_mutex);
296 sdev->sdev_state = SDEV_CREATED;
297 INIT_LIST_HEAD(&sdev->siblings);
298 INIT_LIST_HEAD(&sdev->same_target_siblings);
299 INIT_LIST_HEAD(&sdev->starved_entry);
300 INIT_LIST_HEAD(&sdev->event_list);
301 spin_lock_init(&sdev->list_lock);
302 mutex_init(&sdev->inquiry_mutex);
303 INIT_WORK(&sdev->event_work, scsi_evt_thread);
304 INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
306 sdev->sdev_gendev.parent = get_device(&starget->dev);
307 sdev->sdev_target = starget;
309 /* usually NULL and set by ->slave_alloc instead */
310 sdev->hostdata = hostdata;
312 /* if the device needs this changing, it may do so in the
313 * slave_configure function */
314 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
317 * Some low level driver could use device->type
322 * Assume that the device will have handshaking problems,
323 * and then fix this field later if it turns out it
328 sdev->sg_reserved_size = INT_MAX;
330 q = blk_mq_init_queue(&sdev->host->tag_set);
332 /* release fn is set up in scsi_sysfs_device_initialise, so
333 * have to free and put manually here */
334 put_device(&starget->dev);
338 sdev->request_queue = q;
340 __scsi_init_queue(sdev->host, q);
341 WARN_ON_ONCE(!blk_get_queue(q));
343 depth = sdev->host->cmd_per_lun ?: 1;
346 * Use .can_queue as budget map's depth because we have to
347 * support adjusting queue depth from sysfs. Meantime use
348 * default device queue depth to figure out sbitmap shift
349 * since we use this queue depth most of times.
351 if (scsi_realloc_sdev_budget_map(sdev, depth)) {
352 put_device(&starget->dev);
357 scsi_change_queue_depth(sdev, depth);
359 scsi_sysfs_device_initialize(sdev);
361 if (shost->hostt->slave_alloc) {
362 ret = shost->hostt->slave_alloc(sdev);
365 * if LLDD reports slave not present, don't clutter
366 * console with alloc failure messages
369 display_failure_msg = 0;
370 goto out_device_destroy;
377 __scsi_remove_device(sdev);
379 if (display_failure_msg)
380 printk(ALLOC_FAILURE_MSG, __func__);
384 static void scsi_target_destroy(struct scsi_target *starget)
386 struct device *dev = &starget->dev;
387 struct Scsi_Host *shost = dev_to_shost(dev->parent);
390 BUG_ON(starget->state == STARGET_DEL);
391 starget->state = STARGET_DEL;
392 transport_destroy_device(dev);
393 spin_lock_irqsave(shost->host_lock, flags);
394 if (shost->hostt->target_destroy)
395 shost->hostt->target_destroy(starget);
396 list_del_init(&starget->siblings);
397 spin_unlock_irqrestore(shost->host_lock, flags);
401 static void scsi_target_dev_release(struct device *dev)
403 struct device *parent = dev->parent;
404 struct scsi_target *starget = to_scsi_target(dev);
410 static struct device_type scsi_target_type = {
411 .name = "scsi_target",
412 .release = scsi_target_dev_release,
415 int scsi_is_target_device(const struct device *dev)
417 return dev->type == &scsi_target_type;
419 EXPORT_SYMBOL(scsi_is_target_device);
421 static struct scsi_target *__scsi_find_target(struct device *parent,
422 int channel, uint id)
424 struct scsi_target *starget, *found_starget = NULL;
425 struct Scsi_Host *shost = dev_to_shost(parent);
427 * Search for an existing target for this sdev.
429 list_for_each_entry(starget, &shost->__targets, siblings) {
430 if (starget->id == id &&
431 starget->channel == channel) {
432 found_starget = starget;
437 get_device(&found_starget->dev);
439 return found_starget;
443 * scsi_target_reap_ref_release - remove target from visibility
444 * @kref: the reap_ref in the target being released
446 * Called on last put of reap_ref, which is the indication that no device
447 * under this target is visible anymore, so render the target invisible in
448 * sysfs. Note: we have to be in user context here because the target reaps
449 * should be done in places where the scsi device visibility is being removed.
451 static void scsi_target_reap_ref_release(struct kref *kref)
453 struct scsi_target *starget
454 = container_of(kref, struct scsi_target, reap_ref);
457 * if we get here and the target is still in a CREATED state that
458 * means it was allocated but never made visible (because a scan
459 * turned up no LUNs), so don't call device_del() on it.
461 if ((starget->state != STARGET_CREATED) &&
462 (starget->state != STARGET_CREATED_REMOVE)) {
463 transport_remove_device(&starget->dev);
464 device_del(&starget->dev);
466 scsi_target_destroy(starget);
469 static void scsi_target_reap_ref_put(struct scsi_target *starget)
471 kref_put(&starget->reap_ref, scsi_target_reap_ref_release);
475 * scsi_alloc_target - allocate a new or find an existing target
476 * @parent: parent of the target (need not be a scsi host)
477 * @channel: target channel number (zero if no channels)
478 * @id: target id number
480 * Return an existing target if one exists, provided it hasn't already
481 * gone into STARGET_DEL state, otherwise allocate a new target.
483 * The target is returned with an incremented reference, so the caller
484 * is responsible for both reaping and doing a last put
486 static struct scsi_target *scsi_alloc_target(struct device *parent,
487 int channel, uint id)
489 struct Scsi_Host *shost = dev_to_shost(parent);
490 struct device *dev = NULL;
492 const int size = sizeof(struct scsi_target)
493 + shost->transportt->target_size;
494 struct scsi_target *starget;
495 struct scsi_target *found_target;
498 starget = kzalloc(size, GFP_KERNEL);
500 printk(KERN_ERR "%s: allocation failure\n", __func__);
504 device_initialize(dev);
505 kref_init(&starget->reap_ref);
506 dev->parent = get_device(parent);
507 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
508 dev->bus = &scsi_bus_type;
509 dev->type = &scsi_target_type;
510 scsi_enable_async_suspend(dev);
512 starget->channel = channel;
513 starget->can_queue = 0;
514 INIT_LIST_HEAD(&starget->siblings);
515 INIT_LIST_HEAD(&starget->devices);
516 starget->state = STARGET_CREATED;
517 starget->scsi_level = SCSI_2;
518 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
520 spin_lock_irqsave(shost->host_lock, flags);
522 found_target = __scsi_find_target(parent, channel, id);
526 list_add_tail(&starget->siblings, &shost->__targets);
527 spin_unlock_irqrestore(shost->host_lock, flags);
528 /* allocate and add */
529 transport_setup_device(dev);
530 if (shost->hostt->target_alloc) {
531 error = shost->hostt->target_alloc(starget);
535 dev_err(dev, "target allocation failed, error %d\n", error);
536 /* don't want scsi_target_reap to do the final
537 * put because it will be under the host lock */
538 scsi_target_destroy(starget);
548 * release routine already fired if kref is zero, so if we can still
549 * take the reference, the target must be alive. If we can't, it must
550 * be dying and we need to wait for a new target
552 ref_got = kref_get_unless_zero(&found_target->reap_ref);
554 spin_unlock_irqrestore(shost->host_lock, flags);
560 * Unfortunately, we found a dying target; need to wait until it's
561 * dead before we can get a new one. There is an anomaly here. We
562 * *should* call scsi_target_reap() to balance the kref_get() of the
563 * reap_ref above. However, since the target being released, it's
564 * already invisible and the reap_ref is irrelevant. If we call
565 * scsi_target_reap() we might spuriously do another device_del() on
566 * an already invisible target.
568 put_device(&found_target->dev);
570 * length of time is irrelevant here, we just want to yield the CPU
571 * for a tick to avoid busy waiting for the target to die.
578 * scsi_target_reap - check to see if target is in use and destroy if not
579 * @starget: target to be checked
581 * This is used after removing a LUN or doing a last put of the target
582 * it checks atomically that nothing is using the target and removes
585 void scsi_target_reap(struct scsi_target *starget)
588 * serious problem if this triggers: STARGET_DEL is only set in the if
589 * the reap_ref drops to zero, so we're trying to do another final put
590 * on an already released kref
592 BUG_ON(starget->state == STARGET_DEL);
593 scsi_target_reap_ref_put(starget);
597 * scsi_sanitize_inquiry_string - remove non-graphical chars from an
598 * INQUIRY result string
599 * @s: INQUIRY result string to sanitize
600 * @len: length of the string
603 * The SCSI spec says that INQUIRY vendor, product, and revision
604 * strings must consist entirely of graphic ASCII characters,
605 * padded on the right with spaces. Since not all devices obey
606 * this rule, we will replace non-graphic or non-ASCII characters
607 * with spaces. Exception: a NUL character is interpreted as a
608 * string terminator, so all the following characters are set to
611 void scsi_sanitize_inquiry_string(unsigned char *s, int len)
615 for (; len > 0; (--len, ++s)) {
618 if (terminated || *s < 0x20 || *s > 0x7e)
622 EXPORT_SYMBOL(scsi_sanitize_inquiry_string);
625 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
626 * @sdev: scsi_device to probe
627 * @inq_result: area to store the INQUIRY result
628 * @result_len: len of inq_result
629 * @bflags: store any bflags found here
632 * Probe the lun associated with @req using a standard SCSI INQUIRY;
634 * If the INQUIRY is successful, zero is returned and the
635 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
636 * are copied to the scsi_device any flags value is stored in *@bflags.
638 static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
639 int result_len, blist_flags_t *bflags)
641 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
642 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
643 int response_len = 0;
644 int pass, count, result;
645 struct scsi_sense_hdr sshdr;
649 /* Perform up to 3 passes. The first pass uses a conservative
650 * transfer length of 36 unless sdev->inquiry_len specifies a
651 * different value. */
652 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
653 try_inquiry_len = first_inquiry_len;
657 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
658 "scsi scan: INQUIRY pass %d length %d\n",
659 pass, try_inquiry_len));
661 /* Each pass gets up to three chances to ignore Unit Attention */
662 for (count = 0; count < 3; ++count) {
665 memset(scsi_cmd, 0, 6);
666 scsi_cmd[0] = INQUIRY;
667 scsi_cmd[4] = (unsigned char) try_inquiry_len;
669 memset(inq_result, 0, try_inquiry_len);
671 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
672 inq_result, try_inquiry_len, &sshdr,
673 HZ / 2 + HZ * scsi_inq_timeout, 3,
676 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
677 "scsi scan: INQUIRY %s with code 0x%x\n",
678 result ? "failed" : "successful", result));
682 * not-ready to ready transition [asc/ascq=0x28/0x0]
683 * or power-on, reset [asc/ascq=0x29/0x0], continue.
684 * INQUIRY should not yield UNIT_ATTENTION
685 * but many buggy devices do so anyway.
687 if (scsi_status_is_check_condition(result) &&
688 scsi_sense_valid(&sshdr)) {
689 if ((sshdr.sense_key == UNIT_ATTENTION) &&
690 ((sshdr.asc == 0x28) ||
691 (sshdr.asc == 0x29)) &&
695 } else if (result == 0) {
697 * if nothing was transferred, we try
698 * again. It's a workaround for some USB
701 if (resid == try_inquiry_len)
708 scsi_sanitize_inquiry_string(&inq_result[8], 8);
709 scsi_sanitize_inquiry_string(&inq_result[16], 16);
710 scsi_sanitize_inquiry_string(&inq_result[32], 4);
712 response_len = inq_result[4] + 5;
713 if (response_len > 255)
714 response_len = first_inquiry_len; /* sanity */
717 * Get any flags for this device.
719 * XXX add a bflags to scsi_device, and replace the
720 * corresponding bit fields in scsi_device, so bflags
721 * need not be passed as an argument.
723 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
726 /* When the first pass succeeds we gain information about
727 * what larger transfer lengths might work. */
729 if (BLIST_INQUIRY_36 & *bflags)
730 next_inquiry_len = 36;
731 else if (sdev->inquiry_len)
732 next_inquiry_len = sdev->inquiry_len;
734 next_inquiry_len = response_len;
736 /* If more data is available perform the second pass */
737 if (next_inquiry_len > try_inquiry_len) {
738 try_inquiry_len = next_inquiry_len;
744 } else if (pass == 2) {
745 sdev_printk(KERN_INFO, sdev,
746 "scsi scan: %d byte inquiry failed. "
747 "Consider BLIST_INQUIRY_36 for this device\n",
750 /* If this pass failed, the third pass goes back and transfers
751 * the same amount as we successfully got in the first pass. */
752 try_inquiry_len = first_inquiry_len;
757 /* If the last transfer attempt got an error, assume the
758 * peripheral doesn't exist or is dead. */
762 /* Don't report any more data than the device says is valid */
763 sdev->inquiry_len = min(try_inquiry_len, response_len);
766 * XXX Abort if the response length is less than 36? If less than
767 * 32, the lookup of the device flags (above) could be invalid,
768 * and it would be possible to take an incorrect action - we do
769 * not want to hang because of a short INQUIRY. On the flip side,
770 * if the device is spun down or becoming ready (and so it gives a
771 * short INQUIRY), an abort here prevents any further use of the
772 * device, including spin up.
774 * On the whole, the best approach seems to be to assume the first
775 * 36 bytes are valid no matter what the device says. That's
776 * better than copying < 36 bytes to the inquiry-result buffer
777 * and displaying garbage for the Vendor, Product, or Revision
780 if (sdev->inquiry_len < 36) {
781 if (!sdev->host->short_inquiry) {
782 shost_printk(KERN_INFO, sdev->host,
783 "scsi scan: INQUIRY result too short (%d),"
784 " using 36\n", sdev->inquiry_len);
785 sdev->host->short_inquiry = 1;
787 sdev->inquiry_len = 36;
791 * Related to the above issue:
793 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
794 * and if not ready, sent a START_STOP to start (maybe spin up) and
795 * then send the INQUIRY again, since the INQUIRY can change after
796 * a device is initialized.
798 * Ideally, start a device if explicitly asked to do so. This
799 * assumes that a device is spun up on power on, spun down on
800 * request, and then spun up on request.
804 * The scanning code needs to know the scsi_level, even if no
805 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
806 * non-zero LUNs can be scanned.
808 sdev->scsi_level = inq_result[2] & 0x07;
809 if (sdev->scsi_level >= 2 ||
810 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
812 sdev->sdev_target->scsi_level = sdev->scsi_level;
815 * If SCSI-2 or lower, and if the transport requires it,
816 * store the LUN value in CDB[1].
818 sdev->lun_in_cdb = 0;
819 if (sdev->scsi_level <= SCSI_2 &&
820 sdev->scsi_level != SCSI_UNKNOWN &&
821 !sdev->host->no_scsi2_lun_in_cdb)
822 sdev->lun_in_cdb = 1;
828 * scsi_add_lun - allocate and fully initialze a scsi_device
829 * @sdev: holds information to be stored in the new scsi_device
830 * @inq_result: holds the result of a previous INQUIRY to the LUN
831 * @bflags: black/white list flag
832 * @async: 1 if this device is being scanned asynchronously
835 * Initialize the scsi_device @sdev. Optionally set fields based
836 * on values in *@bflags.
839 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
840 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
842 static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
843 blist_flags_t *bflags, int async)
848 * XXX do not save the inquiry, since it can change underneath us,
849 * save just vendor/model/rev.
851 * Rather than save it and have an ioctl that retrieves the saved
852 * value, have an ioctl that executes the same INQUIRY code used
853 * in scsi_probe_lun, let user level programs doing INQUIRY
854 * scanning run at their own risk, or supply a user level program
855 * that can correctly scan.
859 * Copy at least 36 bytes of INQUIRY data, so that we don't
860 * dereference unallocated memory when accessing the Vendor,
861 * Product, and Revision strings. Badly behaved devices may set
862 * the INQUIRY Additional Length byte to a small value, indicating
863 * these strings are invalid, but often they contain plausible data
864 * nonetheless. It doesn't matter if the device sent < 36 bytes
865 * total, since scsi_probe_lun() initializes inq_result with 0s.
867 sdev->inquiry = kmemdup(inq_result,
868 max_t(size_t, sdev->inquiry_len, 36),
870 if (sdev->inquiry == NULL)
871 return SCSI_SCAN_NO_RESPONSE;
873 sdev->vendor = (char *) (sdev->inquiry + 8);
874 sdev->model = (char *) (sdev->inquiry + 16);
875 sdev->rev = (char *) (sdev->inquiry + 32);
877 if (strncmp(sdev->vendor, "ATA ", 8) == 0) {
879 * sata emulation layer device. This is a hack to work around
880 * the SATL power management specifications which state that
881 * when the SATL detects the device has gone into standby
882 * mode, it shall respond with NOT READY.
884 sdev->allow_restart = 1;
887 if (*bflags & BLIST_ISROM) {
888 sdev->type = TYPE_ROM;
891 sdev->type = (inq_result[0] & 0x1f);
892 sdev->removable = (inq_result[1] & 0x80) >> 7;
895 * some devices may respond with wrong type for
896 * well-known logical units. Force well-known type
897 * to enumerate them correctly.
899 if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
900 sdev_printk(KERN_WARNING, sdev,
901 "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n",
902 __func__, sdev->type, (unsigned int)sdev->lun);
903 sdev->type = TYPE_WLUN;
908 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
909 /* RBC and MMC devices can return SCSI-3 compliance and yet
910 * still not support REPORT LUNS, so make them act as
911 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
912 * specifically set */
913 if ((*bflags & BLIST_REPORTLUN2) == 0)
914 *bflags |= BLIST_NOREPORTLUN;
918 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
919 * spec says: The device server is capable of supporting the
920 * specified peripheral device type on this logical unit. However,
921 * the physical device is not currently connected to this logical
924 * The above is vague, as it implies that we could treat 001 and
925 * 011 the same. Stay compatible with previous code, and create a
926 * scsi_device for a PQ of 1
928 * Don't set the device offline here; rather let the upper
929 * level drivers eval the PQ to decide whether they should
930 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
933 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
934 sdev->lockable = sdev->removable;
935 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
937 if (sdev->scsi_level >= SCSI_3 ||
938 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
940 if (inq_result[7] & 0x60)
942 if (inq_result[7] & 0x10)
945 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
946 "ANSI: %d%s\n", scsi_device_type(sdev->type),
947 sdev->vendor, sdev->model, sdev->rev,
948 sdev->inq_periph_qual, inq_result[2] & 0x07,
949 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
951 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
952 !(*bflags & BLIST_NOTQ)) {
953 sdev->tagged_supported = 1;
954 sdev->simple_tags = 1;
958 * Some devices (Texel CD ROM drives) have handshaking problems
959 * when used with the Seagate controllers. borken is initialized
960 * to 1, and then set it to 0 here.
962 if ((*bflags & BLIST_BORKEN) == 0)
965 if (*bflags & BLIST_NO_ULD_ATTACH)
966 sdev->no_uld_attach = 1;
969 * Apparently some really broken devices (contrary to the SCSI
970 * standards) need to be selected without asserting ATN
972 if (*bflags & BLIST_SELECT_NO_ATN)
973 sdev->select_no_atn = 1;
976 * Maximum 512 sector transfer length
977 * broken RA4x00 Compaq Disk Array
979 if (*bflags & BLIST_MAX_512)
980 blk_queue_max_hw_sectors(sdev->request_queue, 512);
982 * Max 1024 sector transfer length for targets that report incorrect
983 * max/optimal lengths and relied on the old block layer safe default
985 else if (*bflags & BLIST_MAX_1024)
986 blk_queue_max_hw_sectors(sdev->request_queue, 1024);
989 * Some devices may not want to have a start command automatically
990 * issued when a device is added.
992 if (*bflags & BLIST_NOSTARTONADD)
993 sdev->no_start_on_add = 1;
995 if (*bflags & BLIST_SINGLELUN)
996 scsi_target(sdev)->single_lun = 1;
998 sdev->use_10_for_rw = 1;
1000 /* some devices don't like REPORT SUPPORTED OPERATION CODES
1001 * and will simply timeout causing sd_mod init to take a very
1003 if (*bflags & BLIST_NO_RSOC)
1004 sdev->no_report_opcodes = 1;
1006 /* set the device running here so that slave configure
1008 mutex_lock(&sdev->state_mutex);
1009 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
1011 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
1012 mutex_unlock(&sdev->state_mutex);
1015 sdev_printk(KERN_ERR, sdev,
1016 "in wrong state %s to complete scan\n",
1017 scsi_device_state_name(sdev->sdev_state));
1018 return SCSI_SCAN_NO_RESPONSE;
1021 if (*bflags & BLIST_NOT_LOCKABLE)
1024 if (*bflags & BLIST_RETRY_HWERROR)
1025 sdev->retry_hwerror = 1;
1027 if (*bflags & BLIST_NO_DIF)
1030 if (*bflags & BLIST_UNMAP_LIMIT_WS)
1031 sdev->unmap_limit_for_ws = 1;
1033 if (*bflags & BLIST_IGN_MEDIA_CHANGE)
1034 sdev->ignore_media_change = 1;
1036 sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT;
1038 if (*bflags & BLIST_TRY_VPD_PAGES)
1039 sdev->try_vpd_pages = 1;
1040 else if (*bflags & BLIST_SKIP_VPD_PAGES)
1041 sdev->skip_vpd_pages = 1;
1043 transport_configure_device(&sdev->sdev_gendev);
1045 if (sdev->host->hostt->slave_configure) {
1046 ret = sdev->host->hostt->slave_configure(sdev);
1049 * if LLDD reports slave not present, don't clutter
1050 * console with alloc failure messages
1052 if (ret != -ENXIO) {
1053 sdev_printk(KERN_ERR, sdev,
1054 "failed to configure device\n");
1056 return SCSI_SCAN_NO_RESPONSE;
1060 * The queue_depth is often changed in ->slave_configure.
1061 * Set up budget map again since memory consumption of
1062 * the map depends on actual queue depth.
1064 scsi_realloc_sdev_budget_map(sdev, sdev->queue_depth);
1067 if (sdev->scsi_level >= SCSI_3)
1068 scsi_attach_vpd(sdev);
1070 sdev->max_queue_depth = sdev->queue_depth;
1071 WARN_ON_ONCE(sdev->max_queue_depth > sdev->budget_map.depth);
1072 sdev->sdev_bflags = *bflags;
1075 * Ok, the device is now all set up, we can
1076 * register it and tell the rest of the kernel
1079 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
1080 return SCSI_SCAN_NO_RESPONSE;
1082 return SCSI_SCAN_LUN_PRESENT;
1085 #ifdef CONFIG_SCSI_LOGGING
1087 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
1088 * @buf: Output buffer with at least end-first+1 bytes of space
1089 * @inq: Inquiry buffer (input)
1090 * @first: Offset of string into inq
1091 * @end: Index after last character in inq
1093 static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
1094 unsigned first, unsigned end)
1096 unsigned term = 0, idx;
1098 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
1099 if (inq[idx+first] > ' ') {
1100 buf[idx] = inq[idx+first];
1112 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1113 * @starget: pointer to target device structure
1114 * @lun: LUN of target device
1115 * @bflagsp: store bflags here if not NULL
1116 * @sdevp: probe the LUN corresponding to this scsi_device
1117 * @rescan: if not equal to SCSI_SCAN_INITIAL skip some code only
1118 * needed on first scan
1119 * @hostdata: passed to scsi_alloc_sdev()
1122 * Call scsi_probe_lun, if a LUN with an attached device is found,
1123 * allocate and set it up by calling scsi_add_lun.
1127 * - SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
1128 * - SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1129 * attached at the LUN
1130 * - SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
1132 static int scsi_probe_and_add_lun(struct scsi_target *starget,
1133 u64 lun, blist_flags_t *bflagsp,
1134 struct scsi_device **sdevp,
1135 enum scsi_scan_mode rescan,
1138 struct scsi_device *sdev;
1139 unsigned char *result;
1140 blist_flags_t bflags;
1141 int res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
1142 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1145 * The rescan flag is used as an optimization, the first scan of a
1146 * host adapter calls into here with rescan == 0.
1148 sdev = scsi_device_lookup_by_target(starget, lun);
1150 if (rescan != SCSI_SCAN_INITIAL || !scsi_device_created(sdev)) {
1151 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
1152 "scsi scan: device exists on %s\n",
1153 dev_name(&sdev->sdev_gendev)));
1157 scsi_device_put(sdev);
1160 *bflagsp = scsi_get_device_flags(sdev,
1163 return SCSI_SCAN_LUN_PRESENT;
1165 scsi_device_put(sdev);
1167 sdev = scsi_alloc_sdev(starget, lun, hostdata);
1171 result = kmalloc(result_len, GFP_KERNEL);
1175 if (scsi_probe_lun(sdev, result, result_len, &bflags))
1176 goto out_free_result;
1181 * result contains valid SCSI INQUIRY data.
1183 if ((result[0] >> 5) == 3) {
1185 * For a Peripheral qualifier 3 (011b), the SCSI
1186 * spec says: The device server is not capable of
1187 * supporting a physical device on this logical
1190 * For disks, this implies that there is no
1191 * logical disk configured at sdev->lun, but there
1192 * is a target id responding.
1194 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1195 " peripheral qualifier of 3, device not"
1198 SCSI_LOG_SCAN_BUS(1, {
1199 unsigned char vend[9];
1200 unsigned char mod[17];
1202 sdev_printk(KERN_INFO, sdev,
1203 "scsi scan: consider passing scsi_mod."
1204 "dev_flags=%s:%s:0x240 or 0x1000240\n",
1205 scsi_inq_str(vend, result, 8, 16),
1206 scsi_inq_str(mod, result, 16, 32));
1211 res = SCSI_SCAN_TARGET_PRESENT;
1212 goto out_free_result;
1216 * Some targets may set slight variations of PQ and PDT to signal
1217 * that no LUN is present, so don't add sdev in these cases.
1218 * Two specific examples are:
1219 * 1) NetApp targets: return PQ=1, PDT=0x1f
1220 * 2) IBM/2145 targets: return PQ=1, PDT=0
1221 * 3) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1222 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1225 * 1) SCSI SPC-3, pp. 145-146
1226 * PQ=1: "A peripheral device having the specified peripheral
1227 * device type is not connected to this logical unit. However, the
1228 * device server is capable of supporting the specified peripheral
1229 * device type on this logical unit."
1230 * PDT=0x1f: "Unknown or no device type"
1231 * 2) USB UFI 1.0, p. 20
1232 * PDT=00h Direct-access device (floppy)
1233 * PDT=1Fh none (no FDD connected to the requested logical unit)
1235 if (((result[0] >> 5) == 1 ||
1236 (starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f)) &&
1237 !scsi_is_wlun(lun)) {
1238 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
1239 "scsi scan: peripheral device type"
1240 " of 31, no device added\n"));
1241 res = SCSI_SCAN_TARGET_PRESENT;
1242 goto out_free_result;
1245 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
1246 if (res == SCSI_SCAN_LUN_PRESENT) {
1247 if (bflags & BLIST_KEY) {
1249 scsi_unlock_floptical(sdev, result);
1256 if (res == SCSI_SCAN_LUN_PRESENT) {
1258 if (scsi_device_get(sdev) == 0) {
1261 __scsi_remove_device(sdev);
1262 res = SCSI_SCAN_NO_RESPONSE;
1266 __scsi_remove_device(sdev);
1272 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1273 * @starget: pointer to target structure to scan
1274 * @bflags: black/white list flag for LUN 0
1275 * @scsi_level: Which version of the standard does this device adhere to
1276 * @rescan: passed to scsi_probe_add_lun()
1279 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1280 * scanned) to some maximum lun until a LUN is found with no device
1281 * attached. Use the bflags to figure out any oddities.
1283 * Modifies sdevscan->lun.
1285 static void scsi_sequential_lun_scan(struct scsi_target *starget,
1286 blist_flags_t bflags, int scsi_level,
1287 enum scsi_scan_mode rescan)
1290 u64 sparse_lun, lun;
1291 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1293 SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget,
1294 "scsi scan: Sequential scan\n"));
1296 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1298 * If this device is known to support sparse multiple units,
1299 * override the other settings, and scan all of them. Normally,
1300 * SCSI-3 devices should be scanned via the REPORT LUNS.
1302 if (bflags & BLIST_SPARSELUN) {
1303 max_dev_lun = shost->max_lun;
1309 * If less than SCSI_1_CCS, and no special lun scanning, stop
1310 * scanning; this matches 2.4 behaviour, but could just be a bug
1311 * (to continue scanning a SCSI_1_CCS device).
1313 * This test is broken. We might not have any device on lun0 for
1314 * a sparselun device, and if that's the case then how would we
1315 * know the real scsi_level, eh? It might make sense to just not
1316 * scan any SCSI_1 device for non-0 luns, but that check would best
1317 * go into scsi_alloc_sdev() and just have it return null when asked
1318 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1320 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1321 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1326 * If this device is known to support multiple units, override
1327 * the other settings, and scan all of them.
1329 if (bflags & BLIST_FORCELUN)
1330 max_dev_lun = shost->max_lun;
1332 * REGAL CDC-4X: avoid hang after LUN 4
1334 if (bflags & BLIST_MAX5LUN)
1335 max_dev_lun = min(5U, max_dev_lun);
1337 * Do not scan SCSI-2 or lower device past LUN 7, unless
1340 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1341 max_dev_lun = min(8U, max_dev_lun);
1343 max_dev_lun = min(256U, max_dev_lun);
1346 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1347 * until we reach the max, or no LUN is found and we are not
1350 for (lun = 1; lun < max_dev_lun; ++lun)
1351 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1352 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1358 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1359 * @starget: which target
1360 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1361 * @rescan: nonzero if we can skip code only needed on first scan
1364 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1365 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
1367 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1368 * LUNs even if it's older than SCSI-3.
1369 * If BLIST_NOREPORTLUN is set, return 1 always.
1370 * If BLIST_NOLUN is set, return 0 always.
1371 * If starget->no_report_luns is set, return 1 always.
1374 * 0: scan completed (or no memory, so further scanning is futile)
1375 * 1: could not scan with REPORT LUN
1377 static int scsi_report_lun_scan(struct scsi_target *starget, blist_flags_t bflags,
1378 enum scsi_scan_mode rescan)
1380 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1381 unsigned int length;
1383 unsigned int num_luns;
1384 unsigned int retries;
1386 struct scsi_lun *lunp, *lun_data;
1387 struct scsi_sense_hdr sshdr;
1388 struct scsi_device *sdev;
1389 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
1393 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1394 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1395 * support more than 8 LUNs.
1396 * Don't attempt if the target doesn't support REPORT LUNS.
1398 if (bflags & BLIST_NOREPORTLUN)
1400 if (starget->scsi_level < SCSI_2 &&
1401 starget->scsi_level != SCSI_UNKNOWN)
1403 if (starget->scsi_level < SCSI_3 &&
1404 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
1406 if (bflags & BLIST_NOLUN)
1408 if (starget->no_report_luns)
1411 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1412 sdev = scsi_alloc_sdev(starget, 0, NULL);
1415 if (scsi_device_get(sdev)) {
1416 __scsi_remove_device(sdev);
1422 * Allocate enough to hold the header (the same size as one scsi_lun)
1423 * plus the number of luns we are requesting. 511 was the default
1424 * value of the now removed max_report_luns parameter.
1426 length = (511 + 1) * sizeof(struct scsi_lun);
1428 lun_data = kmalloc(length, GFP_KERNEL);
1430 printk(ALLOC_FAILURE_MSG, __func__);
1434 scsi_cmd[0] = REPORT_LUNS;
1437 * bytes 1 - 5: reserved, set to zero.
1439 memset(&scsi_cmd[1], 0, 5);
1442 * bytes 6 - 9: length of the command.
1444 put_unaligned_be32(length, &scsi_cmd[6]);
1446 scsi_cmd[10] = 0; /* reserved */
1447 scsi_cmd[11] = 0; /* control */
1450 * We can get a UNIT ATTENTION, for example a power on/reset, so
1451 * retry a few times (like sd.c does for TEST UNIT READY).
1452 * Experience shows some combinations of adapter/devices get at
1453 * least two power on/resets.
1455 * Illegal requests (for devices that do not support REPORT LUNS)
1456 * should come through as a check condition, and will not generate
1459 for (retries = 0; retries < 3; retries++) {
1460 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1461 "scsi scan: Sending REPORT LUNS to (try %d)\n",
1464 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
1465 lun_data, length, &sshdr,
1466 SCSI_REPORT_LUNS_TIMEOUT, 3, NULL);
1468 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1469 "scsi scan: REPORT LUNS"
1470 " %s (try %d) result 0x%x\n",
1471 result ? "failed" : "successful",
1475 else if (scsi_sense_valid(&sshdr)) {
1476 if (sshdr.sense_key != UNIT_ATTENTION)
1483 * The device probably does not support a REPORT LUN command
1490 * Get the length from the first four bytes of lun_data.
1492 if (get_unaligned_be32(lun_data->scsi_lun) +
1493 sizeof(struct scsi_lun) > length) {
1494 length = get_unaligned_be32(lun_data->scsi_lun) +
1495 sizeof(struct scsi_lun);
1499 length = get_unaligned_be32(lun_data->scsi_lun);
1501 num_luns = (length / sizeof(struct scsi_lun));
1503 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1504 "scsi scan: REPORT LUN scan\n"));
1507 * Scan the luns in lun_data. The entry at offset 0 is really
1508 * the header, so start at 1 and go up to and including num_luns.
1510 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1511 lun = scsilun_to_int(lunp);
1513 if (lun > sdev->host->max_lun) {
1514 sdev_printk(KERN_WARNING, sdev,
1515 "lun%llu has a LUN larger than"
1516 " allowed by the host adapter\n", lun);
1520 res = scsi_probe_and_add_lun(starget,
1521 lun, NULL, NULL, rescan, NULL);
1522 if (res == SCSI_SCAN_NO_RESPONSE) {
1524 * Got some results, but now none, abort.
1526 sdev_printk(KERN_ERR, sdev,
1527 "Unexpected response"
1528 " from lun %llu while scanning, scan"
1529 " aborted\n", (unsigned long long)lun);
1538 if (scsi_device_created(sdev))
1540 * the sdev we used didn't appear in the report luns scan
1542 __scsi_remove_device(sdev);
1543 scsi_device_put(sdev);
1547 struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1548 uint id, u64 lun, void *hostdata)
1550 struct scsi_device *sdev = ERR_PTR(-ENODEV);
1551 struct device *parent = &shost->shost_gendev;
1552 struct scsi_target *starget;
1554 if (strncmp(scsi_scan_type, "none", 4) == 0)
1555 return ERR_PTR(-ENODEV);
1557 starget = scsi_alloc_target(parent, channel, id);
1559 return ERR_PTR(-ENOMEM);
1560 scsi_autopm_get_target(starget);
1562 mutex_lock(&shost->scan_mutex);
1563 if (!shost->async_scan)
1564 scsi_complete_async_scans();
1566 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1567 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
1568 scsi_autopm_put_host(shost);
1570 mutex_unlock(&shost->scan_mutex);
1571 scsi_autopm_put_target(starget);
1573 * paired with scsi_alloc_target(). Target will be destroyed unless
1574 * scsi_probe_and_add_lun made an underlying device visible
1576 scsi_target_reap(starget);
1577 put_device(&starget->dev);
1581 EXPORT_SYMBOL(__scsi_add_device);
1583 int scsi_add_device(struct Scsi_Host *host, uint channel,
1584 uint target, u64 lun)
1586 struct scsi_device *sdev =
1587 __scsi_add_device(host, channel, target, lun, NULL);
1589 return PTR_ERR(sdev);
1591 scsi_device_put(sdev);
1594 EXPORT_SYMBOL(scsi_add_device);
1596 void scsi_rescan_device(struct device *dev)
1598 struct scsi_device *sdev = to_scsi_device(dev);
1602 scsi_attach_vpd(sdev);
1604 if (sdev->handler && sdev->handler->rescan)
1605 sdev->handler->rescan(sdev);
1607 if (dev->driver && try_module_get(dev->driver->owner)) {
1608 struct scsi_driver *drv = to_scsi_driver(dev->driver);
1612 module_put(dev->driver->owner);
1616 EXPORT_SYMBOL(scsi_rescan_device);
1618 static void __scsi_scan_target(struct device *parent, unsigned int channel,
1619 unsigned int id, u64 lun, enum scsi_scan_mode rescan)
1621 struct Scsi_Host *shost = dev_to_shost(parent);
1622 blist_flags_t bflags = 0;
1624 struct scsi_target *starget;
1626 if (shost->this_id == id)
1628 * Don't scan the host adapter
1632 starget = scsi_alloc_target(parent, channel, id);
1635 scsi_autopm_get_target(starget);
1637 if (lun != SCAN_WILD_CARD) {
1639 * Scan for a specific host/chan/id/lun.
1641 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1646 * Scan LUN 0, if there is some response, scan further. Ideally, we
1647 * would not configure LUN 0 until all LUNs are scanned.
1649 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1650 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1651 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
1653 * The REPORT LUN did not scan the target,
1654 * do a sequential scan.
1656 scsi_sequential_lun_scan(starget, bflags,
1657 starget->scsi_level, rescan);
1661 scsi_autopm_put_target(starget);
1663 * paired with scsi_alloc_target(): determine if the target has
1664 * any children at all and if not, nuke it
1666 scsi_target_reap(starget);
1668 put_device(&starget->dev);
1672 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1673 * @parent: host to scan
1674 * @channel: channel to scan
1675 * @id: target id to scan
1676 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1677 * @rescan: passed to LUN scanning routines; SCSI_SCAN_INITIAL for
1678 * no rescan, SCSI_SCAN_RESCAN to rescan existing LUNs,
1679 * and SCSI_SCAN_MANUAL to force scanning even if
1680 * 'scan=manual' is set.
1683 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1684 * and possibly all LUNs on the target id.
1686 * First try a REPORT LUN scan, if that does not scan the target, do a
1687 * sequential scan of LUNs on the target id.
1689 void scsi_scan_target(struct device *parent, unsigned int channel,
1690 unsigned int id, u64 lun, enum scsi_scan_mode rescan)
1692 struct Scsi_Host *shost = dev_to_shost(parent);
1694 if (strncmp(scsi_scan_type, "none", 4) == 0)
1697 if (rescan != SCSI_SCAN_MANUAL &&
1698 strncmp(scsi_scan_type, "manual", 6) == 0)
1701 mutex_lock(&shost->scan_mutex);
1702 if (!shost->async_scan)
1703 scsi_complete_async_scans();
1705 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1706 __scsi_scan_target(parent, channel, id, lun, rescan);
1707 scsi_autopm_put_host(shost);
1709 mutex_unlock(&shost->scan_mutex);
1711 EXPORT_SYMBOL(scsi_scan_target);
1713 static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1714 unsigned int id, u64 lun,
1715 enum scsi_scan_mode rescan)
1719 if (id == SCAN_WILD_CARD)
1720 for (id = 0; id < shost->max_id; ++id) {
1722 * XXX adapter drivers when possible (FCP, iSCSI)
1723 * could modify max_id to match the current max,
1724 * not the absolute max.
1726 * XXX add a shost id iterator, so for example,
1727 * the FC ID can be the same as a target id
1728 * without a huge overhead of sparse id's.
1730 if (shost->reverse_ordering)
1732 * Scan from high to low id.
1734 order_id = shost->max_id - id - 1;
1737 __scsi_scan_target(&shost->shost_gendev, channel,
1738 order_id, lun, rescan);
1741 __scsi_scan_target(&shost->shost_gendev, channel,
1745 int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1746 unsigned int id, u64 lun,
1747 enum scsi_scan_mode rescan)
1749 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1750 "%s: <%u:%u:%llu>\n",
1751 __func__, channel, id, lun));
1753 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1754 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1755 ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun)))
1758 mutex_lock(&shost->scan_mutex);
1759 if (!shost->async_scan)
1760 scsi_complete_async_scans();
1762 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1763 if (channel == SCAN_WILD_CARD)
1764 for (channel = 0; channel <= shost->max_channel;
1766 scsi_scan_channel(shost, channel, id, lun,
1769 scsi_scan_channel(shost, channel, id, lun, rescan);
1770 scsi_autopm_put_host(shost);
1772 mutex_unlock(&shost->scan_mutex);
1777 static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1779 struct scsi_device *sdev;
1780 shost_for_each_device(sdev, shost) {
1781 /* target removed before the device could be added */
1782 if (sdev->sdev_state == SDEV_DEL)
1784 /* If device is already visible, skip adding it to sysfs */
1785 if (sdev->is_visible)
1787 if (!scsi_host_scan_allowed(shost) ||
1788 scsi_sysfs_add_sdev(sdev) != 0)
1789 __scsi_remove_device(sdev);
1794 * scsi_prep_async_scan - prepare for an async scan
1795 * @shost: the host which will be scanned
1796 * Returns: a cookie to be passed to scsi_finish_async_scan()
1798 * Tells the midlayer this host is going to do an asynchronous scan.
1799 * It reserves the host's position in the scanning list and ensures
1800 * that other asynchronous scans started after this one won't affect the
1801 * ordering of the discovered devices.
1803 static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
1805 struct async_scan_data *data = NULL;
1806 unsigned long flags;
1808 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1811 mutex_lock(&shost->scan_mutex);
1812 if (shost->async_scan) {
1813 shost_printk(KERN_DEBUG, shost, "%s called twice\n", __func__);
1817 data = kmalloc(sizeof(*data), GFP_KERNEL);
1820 data->shost = scsi_host_get(shost);
1823 init_completion(&data->prev_finished);
1825 spin_lock_irqsave(shost->host_lock, flags);
1826 shost->async_scan = 1;
1827 spin_unlock_irqrestore(shost->host_lock, flags);
1828 mutex_unlock(&shost->scan_mutex);
1830 spin_lock(&async_scan_lock);
1831 if (list_empty(&scanning_hosts))
1832 complete(&data->prev_finished);
1833 list_add_tail(&data->list, &scanning_hosts);
1834 spin_unlock(&async_scan_lock);
1839 mutex_unlock(&shost->scan_mutex);
1845 * scsi_finish_async_scan - asynchronous scan has finished
1846 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1848 * All the devices currently attached to this host have been found.
1849 * This function announces all the devices it has found to the rest
1852 static void scsi_finish_async_scan(struct async_scan_data *data)
1854 struct Scsi_Host *shost;
1855 unsigned long flags;
1860 shost = data->shost;
1862 mutex_lock(&shost->scan_mutex);
1864 if (!shost->async_scan) {
1865 shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
1867 mutex_unlock(&shost->scan_mutex);
1871 wait_for_completion(&data->prev_finished);
1873 scsi_sysfs_add_devices(shost);
1875 spin_lock_irqsave(shost->host_lock, flags);
1876 shost->async_scan = 0;
1877 spin_unlock_irqrestore(shost->host_lock, flags);
1879 mutex_unlock(&shost->scan_mutex);
1881 spin_lock(&async_scan_lock);
1882 list_del(&data->list);
1883 if (!list_empty(&scanning_hosts)) {
1884 struct async_scan_data *next = list_entry(scanning_hosts.next,
1885 struct async_scan_data, list);
1886 complete(&next->prev_finished);
1888 spin_unlock(&async_scan_lock);
1890 scsi_autopm_put_host(shost);
1891 scsi_host_put(shost);
1895 static void do_scsi_scan_host(struct Scsi_Host *shost)
1897 if (shost->hostt->scan_finished) {
1898 unsigned long start = jiffies;
1899 if (shost->hostt->scan_start)
1900 shost->hostt->scan_start(shost);
1902 while (!shost->hostt->scan_finished(shost, jiffies - start))
1905 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1910 static void do_scan_async(void *_data, async_cookie_t c)
1912 struct async_scan_data *data = _data;
1913 struct Scsi_Host *shost = data->shost;
1915 do_scsi_scan_host(shost);
1916 scsi_finish_async_scan(data);
1920 * scsi_scan_host - scan the given adapter
1921 * @shost: adapter to scan
1923 void scsi_scan_host(struct Scsi_Host *shost)
1925 struct async_scan_data *data;
1927 if (strncmp(scsi_scan_type, "none", 4) == 0 ||
1928 strncmp(scsi_scan_type, "manual", 6) == 0)
1930 if (scsi_autopm_get_host(shost) < 0)
1933 data = scsi_prep_async_scan(shost);
1935 do_scsi_scan_host(shost);
1936 scsi_autopm_put_host(shost);
1940 /* register with the async subsystem so wait_for_device_probe()
1941 * will flush this work
1943 async_schedule(do_scan_async, data);
1945 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
1947 EXPORT_SYMBOL(scsi_scan_host);
1949 void scsi_forget_host(struct Scsi_Host *shost)
1951 struct scsi_device *sdev;
1952 unsigned long flags;
1955 spin_lock_irqsave(shost->host_lock, flags);
1956 list_for_each_entry(sdev, &shost->__devices, siblings) {
1957 if (sdev->sdev_state == SDEV_DEL)
1959 spin_unlock_irqrestore(shost->host_lock, flags);
1960 __scsi_remove_device(sdev);
1963 spin_unlock_irqrestore(shost->host_lock, flags);