4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
7 * The general scanning/probing algorithm is as follows, exceptions are
8 * made to it depending on device specific flags, compilation options, and
9 * global variable (boot or module load time) settings.
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
12 * device attached, a scsi_device is allocated and setup for it.
14 * For every id of every channel on the given host:
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
19 * If LUN 0 has a device attached, allocate and setup a
22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
23 * all of the LUNs returned by the REPORT LUN; else,
24 * sequentially scan LUNs up until some maximum is reached,
25 * or a LUN is seen that cannot have a device attached to it.
28 #include <linux/module.h>
29 #include <linux/moduleparam.h>
30 #include <linux/init.h>
31 #include <linux/blkdev.h>
32 #include <linux/delay.h>
33 #include <linux/kthread.h>
34 #include <linux/spinlock.h>
35 #include <linux/async.h>
36 #include <linux/slab.h>
38 #include <scsi/scsi.h>
39 #include <scsi/scsi_cmnd.h>
40 #include <scsi/scsi_device.h>
41 #include <scsi/scsi_driver.h>
42 #include <scsi/scsi_devinfo.h>
43 #include <scsi/scsi_host.h>
44 #include <scsi/scsi_transport.h>
45 #include <scsi/scsi_eh.h>
47 #include "scsi_priv.h"
48 #include "scsi_logging.h"
50 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
51 " SCSI scanning, some SCSI devices might not be configured\n"
56 #define SCSI_TIMEOUT (2*HZ)
59 * Prefix values for the SCSI id's (stored in sysfs name field)
61 #define SCSI_UID_SER_NUM 'S'
62 #define SCSI_UID_UNKNOWN 'Z'
65 * Return values of some of the scanning functions.
67 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
68 * includes allocation or general failures preventing IO from being sent.
70 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
73 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
76 #define SCSI_SCAN_NO_RESPONSE 0
77 #define SCSI_SCAN_TARGET_PRESENT 1
78 #define SCSI_SCAN_LUN_PRESENT 2
80 static const char *scsi_null_device_strs = "nullnullnullnull";
82 #define MAX_SCSI_LUNS 512
84 #ifdef CONFIG_SCSI_MULTI_LUN
85 static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
87 static unsigned int max_scsi_luns = 1;
90 module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR);
91 MODULE_PARM_DESC(max_luns,
92 "last scsi LUN (should be between 1 and 2^32-1)");
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[6] = SCSI_SCAN_TYPE_DEFAULT;
102 module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
103 MODULE_PARM_DESC(scan, "sync, async or none");
106 * max_scsi_report_luns: the maximum number of LUNS that will be
107 * returned from the REPORT LUNS command. 8 times this value must
108 * be allocated. In theory this could be up to an 8 byte value, but
109 * in practice, the maximum number of LUNs suppored by any device
112 static unsigned int max_scsi_report_luns = 511;
114 module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
115 MODULE_PARM_DESC(max_report_luns,
116 "REPORT LUNS maximum number of LUNS received (should be"
117 " between 1 and 16384)");
119 static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
121 module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
122 MODULE_PARM_DESC(inq_timeout,
123 "Timeout (in seconds) waiting for devices to answer INQUIRY."
124 " Default is 20. Some devices may need more; most need less.");
126 /* This lock protects only this list */
127 static DEFINE_SPINLOCK(async_scan_lock);
128 static LIST_HEAD(scanning_hosts);
130 struct async_scan_data {
131 struct list_head list;
132 struct Scsi_Host *shost;
133 struct completion prev_finished;
137 * scsi_complete_async_scans - Wait for asynchronous scans to complete
139 * When this function returns, any host which started scanning before
140 * this function was called will have finished its scan. Hosts which
141 * started scanning after this function was called may or may not have
144 int scsi_complete_async_scans(void)
146 struct async_scan_data *data;
149 if (list_empty(&scanning_hosts))
151 /* If we can't get memory immediately, that's OK. Just
152 * sleep a little. Even if we never get memory, the async
153 * scans will finish eventually.
155 data = kmalloc(sizeof(*data), GFP_KERNEL);
161 init_completion(&data->prev_finished);
163 spin_lock(&async_scan_lock);
164 /* Check that there's still somebody else on the list */
165 if (list_empty(&scanning_hosts))
167 list_add_tail(&data->list, &scanning_hosts);
168 spin_unlock(&async_scan_lock);
170 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
171 wait_for_completion(&data->prev_finished);
173 spin_lock(&async_scan_lock);
174 list_del(&data->list);
175 if (!list_empty(&scanning_hosts)) {
176 struct async_scan_data *next = list_entry(scanning_hosts.next,
177 struct async_scan_data, list);
178 complete(&next->prev_finished);
181 spin_unlock(&async_scan_lock);
187 /* Only exported for the benefit of scsi_wait_scan */
188 EXPORT_SYMBOL_GPL(scsi_complete_async_scans);
192 * For async scanning we need to wait for all the scans to complete before
193 * trying to mount the root fs. Otherwise non-modular drivers may not be ready
196 late_initcall(scsi_complete_async_scans);
200 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
201 * @sdev: scsi device to send command to
202 * @result: area to store the result of the MODE SENSE
205 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
206 * Called for BLIST_KEY devices.
208 static void scsi_unlock_floptical(struct scsi_device *sdev,
209 unsigned char *result)
211 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
213 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
214 scsi_cmd[0] = MODE_SENSE;
218 scsi_cmd[4] = 0x2a; /* size */
220 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
221 SCSI_TIMEOUT, 3, NULL);
225 * scsi_alloc_sdev - allocate and setup a scsi_Device
226 * @starget: which target to allocate a &scsi_device for
228 * @hostdata: usually NULL and set by ->slave_alloc instead
231 * Allocate, initialize for io, and return a pointer to a scsi_Device.
232 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
233 * adds scsi_Device to the appropriate list.
236 * scsi_Device pointer, or NULL on failure.
238 static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
239 unsigned int lun, void *hostdata)
241 struct scsi_device *sdev;
242 int display_failure_msg = 1, ret;
243 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
244 extern void scsi_evt_thread(struct work_struct *work);
245 extern void scsi_requeue_run_queue(struct work_struct *work);
247 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
252 sdev->vendor = scsi_null_device_strs;
253 sdev->model = scsi_null_device_strs;
254 sdev->rev = scsi_null_device_strs;
256 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
257 sdev->id = starget->id;
259 sdev->channel = starget->channel;
260 sdev->sdev_state = SDEV_CREATED;
261 INIT_LIST_HEAD(&sdev->siblings);
262 INIT_LIST_HEAD(&sdev->same_target_siblings);
263 INIT_LIST_HEAD(&sdev->cmd_list);
264 INIT_LIST_HEAD(&sdev->starved_entry);
265 INIT_LIST_HEAD(&sdev->event_list);
266 spin_lock_init(&sdev->list_lock);
267 INIT_WORK(&sdev->event_work, scsi_evt_thread);
268 INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
270 sdev->sdev_gendev.parent = get_device(&starget->dev);
271 sdev->sdev_target = starget;
273 /* usually NULL and set by ->slave_alloc instead */
274 sdev->hostdata = hostdata;
276 /* if the device needs this changing, it may do so in the
277 * slave_configure function */
278 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
281 * Some low level driver could use device->type
286 * Assume that the device will have handshaking problems,
287 * and then fix this field later if it turns out it
292 sdev->request_queue = scsi_alloc_queue(sdev);
293 if (!sdev->request_queue) {
294 /* release fn is set up in scsi_sysfs_device_initialise, so
295 * have to free and put manually here */
296 put_device(&starget->dev);
300 blk_get_queue(sdev->request_queue);
301 sdev->request_queue->queuedata = sdev;
302 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
304 scsi_sysfs_device_initialize(sdev);
306 if (shost->hostt->slave_alloc) {
307 ret = shost->hostt->slave_alloc(sdev);
310 * if LLDD reports slave not present, don't clutter
311 * console with alloc failure messages
314 display_failure_msg = 0;
315 goto out_device_destroy;
322 __scsi_remove_device(sdev);
324 if (display_failure_msg)
325 printk(ALLOC_FAILURE_MSG, __func__);
329 static void scsi_target_destroy(struct scsi_target *starget)
331 struct device *dev = &starget->dev;
332 struct Scsi_Host *shost = dev_to_shost(dev->parent);
335 transport_destroy_device(dev);
336 spin_lock_irqsave(shost->host_lock, flags);
337 if (shost->hostt->target_destroy)
338 shost->hostt->target_destroy(starget);
339 list_del_init(&starget->siblings);
340 spin_unlock_irqrestore(shost->host_lock, flags);
344 static void scsi_target_dev_release(struct device *dev)
346 struct device *parent = dev->parent;
347 struct scsi_target *starget = to_scsi_target(dev);
353 static struct device_type scsi_target_type = {
354 .name = "scsi_target",
355 .release = scsi_target_dev_release,
358 int scsi_is_target_device(const struct device *dev)
360 return dev->type == &scsi_target_type;
362 EXPORT_SYMBOL(scsi_is_target_device);
364 static struct scsi_target *__scsi_find_target(struct device *parent,
365 int channel, uint id)
367 struct scsi_target *starget, *found_starget = NULL;
368 struct Scsi_Host *shost = dev_to_shost(parent);
370 * Search for an existing target for this sdev.
372 list_for_each_entry(starget, &shost->__targets, siblings) {
373 if (starget->id == id &&
374 starget->channel == channel) {
375 found_starget = starget;
380 get_device(&found_starget->dev);
382 return found_starget;
386 * scsi_alloc_target - allocate a new or find an existing target
387 * @parent: parent of the target (need not be a scsi host)
388 * @channel: target channel number (zero if no channels)
389 * @id: target id number
391 * Return an existing target if one exists, provided it hasn't already
392 * gone into STARGET_DEL state, otherwise allocate a new target.
394 * The target is returned with an incremented reference, so the caller
395 * is responsible for both reaping and doing a last put
397 static struct scsi_target *scsi_alloc_target(struct device *parent,
398 int channel, uint id)
400 struct Scsi_Host *shost = dev_to_shost(parent);
401 struct device *dev = NULL;
403 const int size = sizeof(struct scsi_target)
404 + shost->transportt->target_size;
405 struct scsi_target *starget;
406 struct scsi_target *found_target;
409 starget = kzalloc(size, GFP_KERNEL);
411 printk(KERN_ERR "%s: allocation failure\n", __func__);
415 device_initialize(dev);
416 starget->reap_ref = 1;
417 dev->parent = get_device(parent);
418 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
419 dev->bus = &scsi_bus_type;
420 dev->type = &scsi_target_type;
422 starget->channel = channel;
423 starget->can_queue = 0;
424 INIT_LIST_HEAD(&starget->siblings);
425 INIT_LIST_HEAD(&starget->devices);
426 starget->state = STARGET_CREATED;
427 starget->scsi_level = SCSI_2;
428 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
430 spin_lock_irqsave(shost->host_lock, flags);
432 found_target = __scsi_find_target(parent, channel, id);
436 list_add_tail(&starget->siblings, &shost->__targets);
437 spin_unlock_irqrestore(shost->host_lock, flags);
438 /* allocate and add */
439 transport_setup_device(dev);
440 if (shost->hostt->target_alloc) {
441 error = shost->hostt->target_alloc(starget);
444 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
445 /* don't want scsi_target_reap to do the final
446 * put because it will be under the host lock */
447 scsi_target_destroy(starget);
456 found_target->reap_ref++;
457 spin_unlock_irqrestore(shost->host_lock, flags);
458 if (found_target->state != STARGET_DEL) {
462 /* Unfortunately, we found a dying target; need to
463 * wait until it's dead before we can get a new one */
464 put_device(&found_target->dev);
465 flush_scheduled_work();
469 static void scsi_target_reap_usercontext(struct work_struct *work)
471 struct scsi_target *starget =
472 container_of(work, struct scsi_target, ew.work);
474 transport_remove_device(&starget->dev);
475 device_del(&starget->dev);
476 scsi_target_destroy(starget);
480 * scsi_target_reap - check to see if target is in use and destroy if not
481 * @starget: target to be checked
483 * This is used after removing a LUN or doing a last put of the target
484 * it checks atomically that nothing is using the target and removes
487 void scsi_target_reap(struct scsi_target *starget)
489 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
491 enum scsi_target_state state;
494 spin_lock_irqsave(shost->host_lock, flags);
495 state = starget->state;
496 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
498 starget->state = STARGET_DEL;
500 spin_unlock_irqrestore(shost->host_lock, flags);
505 BUG_ON(state == STARGET_DEL);
506 if (state == STARGET_CREATED)
507 scsi_target_destroy(starget);
509 execute_in_process_context(scsi_target_reap_usercontext,
514 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
515 * @s: INQUIRY result string to sanitize
516 * @len: length of the string
519 * The SCSI spec says that INQUIRY vendor, product, and revision
520 * strings must consist entirely of graphic ASCII characters,
521 * padded on the right with spaces. Since not all devices obey
522 * this rule, we will replace non-graphic or non-ASCII characters
523 * with spaces. Exception: a NUL character is interpreted as a
524 * string terminator, so all the following characters are set to
527 static void sanitize_inquiry_string(unsigned char *s, int len)
531 for (; len > 0; (--len, ++s)) {
534 if (terminated || *s < 0x20 || *s > 0x7e)
540 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
541 * @sdev: scsi_device to probe
542 * @inq_result: area to store the INQUIRY result
543 * @result_len: len of inq_result
544 * @bflags: store any bflags found here
547 * Probe the lun associated with @req using a standard SCSI INQUIRY;
549 * If the INQUIRY is successful, zero is returned and the
550 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
551 * are copied to the scsi_device any flags value is stored in *@bflags.
553 static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
554 int result_len, int *bflags)
556 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
557 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
558 int response_len = 0;
559 int pass, count, result;
560 struct scsi_sense_hdr sshdr;
564 /* Perform up to 3 passes. The first pass uses a conservative
565 * transfer length of 36 unless sdev->inquiry_len specifies a
566 * different value. */
567 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
568 try_inquiry_len = first_inquiry_len;
572 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
573 "scsi scan: INQUIRY pass %d length %d\n",
574 pass, try_inquiry_len));
576 /* Each pass gets up to three chances to ignore Unit Attention */
577 for (count = 0; count < 3; ++count) {
580 memset(scsi_cmd, 0, 6);
581 scsi_cmd[0] = INQUIRY;
582 scsi_cmd[4] = (unsigned char) try_inquiry_len;
584 memset(inq_result, 0, try_inquiry_len);
586 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
587 inq_result, try_inquiry_len, &sshdr,
588 HZ / 2 + HZ * scsi_inq_timeout, 3,
591 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
593 result ? "failed" : "successful", result));
597 * not-ready to ready transition [asc/ascq=0x28/0x0]
598 * or power-on, reset [asc/ascq=0x29/0x0], continue.
599 * INQUIRY should not yield UNIT_ATTENTION
600 * but many buggy devices do so anyway.
602 if ((driver_byte(result) & DRIVER_SENSE) &&
603 scsi_sense_valid(&sshdr)) {
604 if ((sshdr.sense_key == UNIT_ATTENTION) &&
605 ((sshdr.asc == 0x28) ||
606 (sshdr.asc == 0x29)) &&
612 * if nothing was transferred, we try
613 * again. It's a workaround for some USB
616 if (resid == try_inquiry_len)
623 sanitize_inquiry_string(&inq_result[8], 8);
624 sanitize_inquiry_string(&inq_result[16], 16);
625 sanitize_inquiry_string(&inq_result[32], 4);
627 response_len = inq_result[4] + 5;
628 if (response_len > 255)
629 response_len = first_inquiry_len; /* sanity */
632 * Get any flags for this device.
634 * XXX add a bflags to scsi_device, and replace the
635 * corresponding bit fields in scsi_device, so bflags
636 * need not be passed as an argument.
638 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
641 /* When the first pass succeeds we gain information about
642 * what larger transfer lengths might work. */
644 if (BLIST_INQUIRY_36 & *bflags)
645 next_inquiry_len = 36;
646 else if (BLIST_INQUIRY_58 & *bflags)
647 next_inquiry_len = 58;
648 else if (sdev->inquiry_len)
649 next_inquiry_len = sdev->inquiry_len;
651 next_inquiry_len = response_len;
653 /* If more data is available perform the second pass */
654 if (next_inquiry_len > try_inquiry_len) {
655 try_inquiry_len = next_inquiry_len;
661 } else if (pass == 2) {
662 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
663 "Consider BLIST_INQUIRY_36 for this device\n",
666 /* If this pass failed, the third pass goes back and transfers
667 * the same amount as we successfully got in the first pass. */
668 try_inquiry_len = first_inquiry_len;
673 /* If the last transfer attempt got an error, assume the
674 * peripheral doesn't exist or is dead. */
678 /* Don't report any more data than the device says is valid */
679 sdev->inquiry_len = min(try_inquiry_len, response_len);
682 * XXX Abort if the response length is less than 36? If less than
683 * 32, the lookup of the device flags (above) could be invalid,
684 * and it would be possible to take an incorrect action - we do
685 * not want to hang because of a short INQUIRY. On the flip side,
686 * if the device is spun down or becoming ready (and so it gives a
687 * short INQUIRY), an abort here prevents any further use of the
688 * device, including spin up.
690 * On the whole, the best approach seems to be to assume the first
691 * 36 bytes are valid no matter what the device says. That's
692 * better than copying < 36 bytes to the inquiry-result buffer
693 * and displaying garbage for the Vendor, Product, or Revision
696 if (sdev->inquiry_len < 36) {
697 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
698 " using 36\n", sdev->inquiry_len);
699 sdev->inquiry_len = 36;
703 * Related to the above issue:
705 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
706 * and if not ready, sent a START_STOP to start (maybe spin up) and
707 * then send the INQUIRY again, since the INQUIRY can change after
708 * a device is initialized.
710 * Ideally, start a device if explicitly asked to do so. This
711 * assumes that a device is spun up on power on, spun down on
712 * request, and then spun up on request.
716 * The scanning code needs to know the scsi_level, even if no
717 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
718 * non-zero LUNs can be scanned.
720 sdev->scsi_level = inq_result[2] & 0x07;
721 if (sdev->scsi_level >= 2 ||
722 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
724 sdev->sdev_target->scsi_level = sdev->scsi_level;
730 * scsi_add_lun - allocate and fully initialze a scsi_device
731 * @sdev: holds information to be stored in the new scsi_device
732 * @inq_result: holds the result of a previous INQUIRY to the LUN
733 * @bflags: black/white list flag
734 * @async: 1 if this device is being scanned asynchronously
737 * Initialize the scsi_device @sdev. Optionally set fields based
738 * on values in *@bflags.
741 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
742 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
744 static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
745 int *bflags, int async)
750 * XXX do not save the inquiry, since it can change underneath us,
751 * save just vendor/model/rev.
753 * Rather than save it and have an ioctl that retrieves the saved
754 * value, have an ioctl that executes the same INQUIRY code used
755 * in scsi_probe_lun, let user level programs doing INQUIRY
756 * scanning run at their own risk, or supply a user level program
757 * that can correctly scan.
761 * Copy at least 36 bytes of INQUIRY data, so that we don't
762 * dereference unallocated memory when accessing the Vendor,
763 * Product, and Revision strings. Badly behaved devices may set
764 * the INQUIRY Additional Length byte to a small value, indicating
765 * these strings are invalid, but often they contain plausible data
766 * nonetheless. It doesn't matter if the device sent < 36 bytes
767 * total, since scsi_probe_lun() initializes inq_result with 0s.
769 sdev->inquiry = kmemdup(inq_result,
770 max_t(size_t, sdev->inquiry_len, 36),
772 if (sdev->inquiry == NULL)
773 return SCSI_SCAN_NO_RESPONSE;
775 sdev->vendor = (char *) (sdev->inquiry + 8);
776 sdev->model = (char *) (sdev->inquiry + 16);
777 sdev->rev = (char *) (sdev->inquiry + 32);
779 if (strncmp(sdev->vendor, "ATA ", 8) == 0) {
781 * sata emulation layer device. This is a hack to work around
782 * the SATL power management specifications which state that
783 * when the SATL detects the device has gone into standby
784 * mode, it shall respond with NOT READY.
786 sdev->allow_restart = 1;
789 if (*bflags & BLIST_ISROM) {
790 sdev->type = TYPE_ROM;
793 sdev->type = (inq_result[0] & 0x1f);
794 sdev->removable = (inq_result[1] & 0x80) >> 7;
797 switch (sdev->type) {
805 case TYPE_MEDIUM_CHANGER:
817 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
820 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
821 /* RBC and MMC devices can return SCSI-3 compliance and yet
822 * still not support REPORT LUNS, so make them act as
823 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
824 * specifically set */
825 if ((*bflags & BLIST_REPORTLUN2) == 0)
826 *bflags |= BLIST_NOREPORTLUN;
830 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
831 * spec says: The device server is capable of supporting the
832 * specified peripheral device type on this logical unit. However,
833 * the physical device is not currently connected to this logical
836 * The above is vague, as it implies that we could treat 001 and
837 * 011 the same. Stay compatible with previous code, and create a
838 * scsi_device for a PQ of 1
840 * Don't set the device offline here; rather let the upper
841 * level drivers eval the PQ to decide whether they should
842 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
845 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
846 sdev->lockable = sdev->removable;
847 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
849 if (sdev->scsi_level >= SCSI_3 ||
850 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
852 if (inq_result[7] & 0x60)
854 if (inq_result[7] & 0x10)
857 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
858 "ANSI: %d%s\n", scsi_device_type(sdev->type),
859 sdev->vendor, sdev->model, sdev->rev,
860 sdev->inq_periph_qual, inq_result[2] & 0x07,
861 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
863 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
864 !(*bflags & BLIST_NOTQ))
865 sdev->tagged_supported = 1;
868 * Some devices (Texel CD ROM drives) have handshaking problems
869 * when used with the Seagate controllers. borken is initialized
870 * to 1, and then set it to 0 here.
872 if ((*bflags & BLIST_BORKEN) == 0)
875 if (*bflags & BLIST_NO_ULD_ATTACH)
876 sdev->no_uld_attach = 1;
879 * Apparently some really broken devices (contrary to the SCSI
880 * standards) need to be selected without asserting ATN
882 if (*bflags & BLIST_SELECT_NO_ATN)
883 sdev->select_no_atn = 1;
886 * Maximum 512 sector transfer length
887 * broken RA4x00 Compaq Disk Array
889 if (*bflags & BLIST_MAX_512)
890 blk_queue_max_hw_sectors(sdev->request_queue, 512);
893 * Some devices may not want to have a start command automatically
894 * issued when a device is added.
896 if (*bflags & BLIST_NOSTARTONADD)
897 sdev->no_start_on_add = 1;
899 if (*bflags & BLIST_SINGLELUN)
900 scsi_target(sdev)->single_lun = 1;
902 sdev->use_10_for_rw = 1;
904 if (*bflags & BLIST_MS_SKIP_PAGE_08)
905 sdev->skip_ms_page_8 = 1;
907 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
908 sdev->skip_ms_page_3f = 1;
910 if (*bflags & BLIST_USE_10_BYTE_MS)
911 sdev->use_10_for_ms = 1;
913 /* set the device running here so that slave configure
915 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
917 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
920 sdev_printk(KERN_ERR, sdev,
921 "in wrong state %s to complete scan\n",
922 scsi_device_state_name(sdev->sdev_state));
923 return SCSI_SCAN_NO_RESPONSE;
927 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
928 sdev->use_192_bytes_for_3f = 1;
930 if (*bflags & BLIST_NOT_LOCKABLE)
933 if (*bflags & BLIST_RETRY_HWERROR)
934 sdev->retry_hwerror = 1;
936 transport_configure_device(&sdev->sdev_gendev);
938 if (sdev->host->hostt->slave_configure) {
939 ret = sdev->host->hostt->slave_configure(sdev);
942 * if LLDD reports slave not present, don't clutter
943 * console with alloc failure messages
946 sdev_printk(KERN_ERR, sdev,
947 "failed to configure device\n");
949 return SCSI_SCAN_NO_RESPONSE;
953 sdev->max_queue_depth = sdev->queue_depth;
956 * Ok, the device is now all set up, we can
957 * register it and tell the rest of the kernel
960 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
961 return SCSI_SCAN_NO_RESPONSE;
963 return SCSI_SCAN_LUN_PRESENT;
966 #ifdef CONFIG_SCSI_LOGGING
968 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
969 * @buf: Output buffer with at least end-first+1 bytes of space
970 * @inq: Inquiry buffer (input)
971 * @first: Offset of string into inq
972 * @end: Index after last character in inq
974 static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
975 unsigned first, unsigned end)
977 unsigned term = 0, idx;
979 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
980 if (inq[idx+first] > ' ') {
981 buf[idx] = inq[idx+first];
993 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
994 * @starget: pointer to target device structure
995 * @lun: LUN of target device
996 * @bflagsp: store bflags here if not NULL
997 * @sdevp: probe the LUN corresponding to this scsi_device
998 * @rescan: if nonzero skip some code only needed on first scan
999 * @hostdata: passed to scsi_alloc_sdev()
1002 * Call scsi_probe_lun, if a LUN with an attached device is found,
1003 * allocate and set it up by calling scsi_add_lun.
1006 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
1007 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1008 * attached at the LUN
1009 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
1011 static int scsi_probe_and_add_lun(struct scsi_target *starget,
1012 uint lun, int *bflagsp,
1013 struct scsi_device **sdevp, int rescan,
1016 struct scsi_device *sdev;
1017 unsigned char *result;
1018 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
1019 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1022 * The rescan flag is used as an optimization, the first scan of a
1023 * host adapter calls into here with rescan == 0.
1025 sdev = scsi_device_lookup_by_target(starget, lun);
1027 if (rescan || !scsi_device_created(sdev)) {
1028 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1029 "scsi scan: device exists on %s\n",
1030 dev_name(&sdev->sdev_gendev)));
1034 scsi_device_put(sdev);
1037 *bflagsp = scsi_get_device_flags(sdev,
1040 return SCSI_SCAN_LUN_PRESENT;
1042 scsi_device_put(sdev);
1044 sdev = scsi_alloc_sdev(starget, lun, hostdata);
1048 result = kmalloc(result_len, GFP_ATOMIC |
1049 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
1053 if (scsi_probe_lun(sdev, result, result_len, &bflags))
1054 goto out_free_result;
1059 * result contains valid SCSI INQUIRY data.
1061 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
1063 * For a Peripheral qualifier 3 (011b), the SCSI
1064 * spec says: The device server is not capable of
1065 * supporting a physical device on this logical
1068 * For disks, this implies that there is no
1069 * logical disk configured at sdev->lun, but there
1070 * is a target id responding.
1072 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1073 " peripheral qualifier of 3, device not"
1076 SCSI_LOG_SCAN_BUS(1, {
1077 unsigned char vend[9];
1078 unsigned char mod[17];
1080 sdev_printk(KERN_INFO, sdev,
1081 "scsi scan: consider passing scsi_mod."
1082 "dev_flags=%s:%s:0x240 or 0x1000240\n",
1083 scsi_inq_str(vend, result, 8, 16),
1084 scsi_inq_str(mod, result, 16, 32));
1089 res = SCSI_SCAN_TARGET_PRESENT;
1090 goto out_free_result;
1094 * Some targets may set slight variations of PQ and PDT to signal
1095 * that no LUN is present, so don't add sdev in these cases.
1096 * Two specific examples are:
1097 * 1) NetApp targets: return PQ=1, PDT=0x1f
1098 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1099 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1102 * 1) SCSI SPC-3, pp. 145-146
1103 * PQ=1: "A peripheral device having the specified peripheral
1104 * device type is not connected to this logical unit. However, the
1105 * device server is capable of supporting the specified peripheral
1106 * device type on this logical unit."
1107 * PDT=0x1f: "Unknown or no device type"
1108 * 2) USB UFI 1.0, p. 20
1109 * PDT=00h Direct-access device (floppy)
1110 * PDT=1Fh none (no FDD connected to the requested logical unit)
1112 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
1113 (result[0] & 0x1f) == 0x1f &&
1114 !scsi_is_wlun(lun)) {
1115 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1116 "scsi scan: peripheral device type"
1117 " of 31, no device added\n"));
1118 res = SCSI_SCAN_TARGET_PRESENT;
1119 goto out_free_result;
1122 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
1123 if (res == SCSI_SCAN_LUN_PRESENT) {
1124 if (bflags & BLIST_KEY) {
1126 scsi_unlock_floptical(sdev, result);
1133 if (res == SCSI_SCAN_LUN_PRESENT) {
1135 if (scsi_device_get(sdev) == 0) {
1138 __scsi_remove_device(sdev);
1139 res = SCSI_SCAN_NO_RESPONSE;
1143 __scsi_remove_device(sdev);
1149 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1150 * @starget: pointer to target structure to scan
1151 * @bflags: black/white list flag for LUN 0
1152 * @scsi_level: Which version of the standard does this device adhere to
1153 * @rescan: passed to scsi_probe_add_lun()
1156 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1157 * scanned) to some maximum lun until a LUN is found with no device
1158 * attached. Use the bflags to figure out any oddities.
1160 * Modifies sdevscan->lun.
1162 static void scsi_sequential_lun_scan(struct scsi_target *starget,
1163 int bflags, int scsi_level, int rescan)
1165 unsigned int sparse_lun, lun, max_dev_lun;
1166 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1168 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
1169 "%s\n", dev_name(&starget->dev)));
1171 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1173 * If this device is known to support sparse multiple units,
1174 * override the other settings, and scan all of them. Normally,
1175 * SCSI-3 devices should be scanned via the REPORT LUNS.
1177 if (bflags & BLIST_SPARSELUN) {
1178 max_dev_lun = shost->max_lun;
1184 * If less than SCSI_1_CSS, and no special lun scaning, stop
1185 * scanning; this matches 2.4 behaviour, but could just be a bug
1186 * (to continue scanning a SCSI_1_CSS device).
1188 * This test is broken. We might not have any device on lun0 for
1189 * a sparselun device, and if that's the case then how would we
1190 * know the real scsi_level, eh? It might make sense to just not
1191 * scan any SCSI_1 device for non-0 luns, but that check would best
1192 * go into scsi_alloc_sdev() and just have it return null when asked
1193 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1195 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1196 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1201 * If this device is known to support multiple units, override
1202 * the other settings, and scan all of them.
1204 if (bflags & BLIST_FORCELUN)
1205 max_dev_lun = shost->max_lun;
1207 * REGAL CDC-4X: avoid hang after LUN 4
1209 if (bflags & BLIST_MAX5LUN)
1210 max_dev_lun = min(5U, max_dev_lun);
1212 * Do not scan SCSI-2 or lower device past LUN 7, unless
1215 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1216 max_dev_lun = min(8U, max_dev_lun);
1219 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1220 * until we reach the max, or no LUN is found and we are not
1223 for (lun = 1; lun < max_dev_lun; ++lun)
1224 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1225 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1231 * scsilun_to_int - convert a scsi_lun to an int
1232 * @scsilun: struct scsi_lun to be converted.
1235 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1236 * integer, and return the result. The caller must check for
1237 * truncation before using this function.
1240 * The struct scsi_lun is assumed to be four levels, with each level
1241 * effectively containing a SCSI byte-ordered (big endian) short; the
1242 * addressing bits of each level are ignored (the highest two bits).
1243 * For a description of the LUN format, post SCSI-3 see the SCSI
1244 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1246 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1247 * the integer: 0x0b030a04
1249 int scsilun_to_int(struct scsi_lun *scsilun)
1255 for (i = 0; i < sizeof(lun); i += 2)
1256 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1257 scsilun->scsi_lun[i + 1]) << (i * 8));
1260 EXPORT_SYMBOL(scsilun_to_int);
1263 * int_to_scsilun - reverts an int into a scsi_lun
1264 * @lun: integer to be reverted
1265 * @scsilun: struct scsi_lun to be set.
1268 * Reverts the functionality of the scsilun_to_int, which packed
1269 * an 8-byte lun value into an int. This routine unpacks the int
1270 * back into the lun value.
1271 * Note: the scsilun_to_int() routine does not truly handle all
1272 * 8bytes of the lun value. This functions restores only as much
1273 * as was set by the routine.
1276 * Given an integer : 0x0b030a04, this function returns a
1277 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1280 void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1284 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1286 for (i = 0; i < sizeof(lun); i += 2) {
1287 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1288 scsilun->scsi_lun[i+1] = lun & 0xFF;
1292 EXPORT_SYMBOL(int_to_scsilun);
1295 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1296 * @starget: which target
1297 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1298 * @rescan: nonzero if we can skip code only needed on first scan
1301 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1302 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
1304 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1305 * LUNs even if it's older than SCSI-3.
1306 * If BLIST_NOREPORTLUN is set, return 1 always.
1307 * If BLIST_NOLUN is set, return 0 always.
1310 * 0: scan completed (or no memory, so further scanning is futile)
1311 * 1: could not scan with REPORT LUN
1313 static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
1317 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1318 unsigned int length;
1320 unsigned int num_luns;
1321 unsigned int retries;
1323 struct scsi_lun *lunp, *lun_data;
1325 struct scsi_sense_hdr sshdr;
1326 struct scsi_device *sdev;
1327 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
1331 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1332 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1333 * support more than 8 LUNs.
1335 if (bflags & BLIST_NOREPORTLUN)
1337 if (starget->scsi_level < SCSI_2 &&
1338 starget->scsi_level != SCSI_UNKNOWN)
1340 if (starget->scsi_level < SCSI_3 &&
1341 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
1343 if (bflags & BLIST_NOLUN)
1346 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1347 sdev = scsi_alloc_sdev(starget, 0, NULL);
1350 if (scsi_device_get(sdev)) {
1351 __scsi_remove_device(sdev);
1356 sprintf(devname, "host %d channel %d id %d",
1357 shost->host_no, sdev->channel, sdev->id);
1360 * Allocate enough to hold the header (the same size as one scsi_lun)
1361 * plus the max number of luns we are requesting.
1363 * Reallocating and trying again (with the exact amount we need)
1364 * would be nice, but then we need to somehow limit the size
1365 * allocated based on the available memory and the limits of
1366 * kmalloc - we don't want a kmalloc() failure of a huge value to
1367 * prevent us from finding any LUNs on this target.
1369 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1370 lun_data = kmalloc(length, GFP_ATOMIC |
1371 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
1373 printk(ALLOC_FAILURE_MSG, __func__);
1377 scsi_cmd[0] = REPORT_LUNS;
1380 * bytes 1 - 5: reserved, set to zero.
1382 memset(&scsi_cmd[1], 0, 5);
1385 * bytes 6 - 9: length of the command.
1387 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1388 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1389 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1390 scsi_cmd[9] = (unsigned char) length & 0xff;
1392 scsi_cmd[10] = 0; /* reserved */
1393 scsi_cmd[11] = 0; /* control */
1396 * We can get a UNIT ATTENTION, for example a power on/reset, so
1397 * retry a few times (like sd.c does for TEST UNIT READY).
1398 * Experience shows some combinations of adapter/devices get at
1399 * least two power on/resets.
1401 * Illegal requests (for devices that do not support REPORT LUNS)
1402 * should come through as a check condition, and will not generate
1405 for (retries = 0; retries < 3; retries++) {
1406 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1407 " REPORT LUNS to %s (try %d)\n", devname,
1410 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
1411 lun_data, length, &sshdr,
1412 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
1414 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
1415 " %s (try %d) result 0x%x\n", result
1416 ? "failed" : "successful", retries, result));
1419 else if (scsi_sense_valid(&sshdr)) {
1420 if (sshdr.sense_key != UNIT_ATTENTION)
1427 * The device probably does not support a REPORT LUN command
1434 * Get the length from the first four bytes of lun_data.
1436 data = (u8 *) lun_data->scsi_lun;
1437 length = ((data[0] << 24) | (data[1] << 16) |
1438 (data[2] << 8) | (data[3] << 0));
1440 num_luns = (length / sizeof(struct scsi_lun));
1441 if (num_luns > max_scsi_report_luns) {
1442 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1443 " of %d luns reported, try increasing"
1444 " max_scsi_report_luns.\n", devname,
1445 max_scsi_report_luns, num_luns);
1446 num_luns = max_scsi_report_luns;
1449 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1450 "scsi scan: REPORT LUN scan\n"));
1453 * Scan the luns in lun_data. The entry at offset 0 is really
1454 * the header, so start at 1 and go up to and including num_luns.
1456 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1457 lun = scsilun_to_int(lunp);
1460 * Check if the unused part of lunp is non-zero, and so
1461 * does not fit in lun.
1463 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1467 * Output an error displaying the LUN in byte order,
1468 * this differs from what linux would print for the
1469 * integer LUN value.
1471 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1472 data = (char *)lunp->scsi_lun;
1473 for (i = 0; i < sizeof(struct scsi_lun); i++)
1474 printk("%02x", data[i]);
1475 printk(" has a LUN larger than currently supported.\n");
1476 } else if (lun > sdev->host->max_lun) {
1477 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1478 " than allowed by the host adapter\n",
1483 res = scsi_probe_and_add_lun(starget,
1484 lun, NULL, NULL, rescan, NULL);
1485 if (res == SCSI_SCAN_NO_RESPONSE) {
1487 * Got some results, but now none, abort.
1489 sdev_printk(KERN_ERR, sdev,
1490 "Unexpected response"
1491 " from lun %d while scanning, scan"
1501 scsi_device_put(sdev);
1502 if (scsi_device_created(sdev))
1504 * the sdev we used didn't appear in the report luns scan
1506 __scsi_remove_device(sdev);
1510 struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1511 uint id, uint lun, void *hostdata)
1513 struct scsi_device *sdev = ERR_PTR(-ENODEV);
1514 struct device *parent = &shost->shost_gendev;
1515 struct scsi_target *starget;
1517 if (strncmp(scsi_scan_type, "none", 4) == 0)
1518 return ERR_PTR(-ENODEV);
1520 starget = scsi_alloc_target(parent, channel, id);
1522 return ERR_PTR(-ENOMEM);
1523 scsi_autopm_get_target(starget);
1525 mutex_lock(&shost->scan_mutex);
1526 if (!shost->async_scan)
1527 scsi_complete_async_scans();
1529 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1530 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
1531 scsi_autopm_put_host(shost);
1533 mutex_unlock(&shost->scan_mutex);
1534 scsi_autopm_put_target(starget);
1535 scsi_target_reap(starget);
1536 put_device(&starget->dev);
1540 EXPORT_SYMBOL(__scsi_add_device);
1542 int scsi_add_device(struct Scsi_Host *host, uint channel,
1543 uint target, uint lun)
1545 struct scsi_device *sdev =
1546 __scsi_add_device(host, channel, target, lun, NULL);
1548 return PTR_ERR(sdev);
1550 scsi_device_put(sdev);
1553 EXPORT_SYMBOL(scsi_add_device);
1555 void scsi_rescan_device(struct device *dev)
1557 struct scsi_driver *drv;
1562 drv = to_scsi_driver(dev->driver);
1563 if (try_module_get(drv->owner)) {
1566 module_put(drv->owner);
1569 EXPORT_SYMBOL(scsi_rescan_device);
1571 static void __scsi_scan_target(struct device *parent, unsigned int channel,
1572 unsigned int id, unsigned int lun, int rescan)
1574 struct Scsi_Host *shost = dev_to_shost(parent);
1577 struct scsi_target *starget;
1579 if (shost->this_id == id)
1581 * Don't scan the host adapter
1585 starget = scsi_alloc_target(parent, channel, id);
1588 scsi_autopm_get_target(starget);
1590 if (lun != SCAN_WILD_CARD) {
1592 * Scan for a specific host/chan/id/lun.
1594 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1599 * Scan LUN 0, if there is some response, scan further. Ideally, we
1600 * would not configure LUN 0 until all LUNs are scanned.
1602 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1603 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1604 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
1606 * The REPORT LUN did not scan the target,
1607 * do a sequential scan.
1609 scsi_sequential_lun_scan(starget, bflags,
1610 starget->scsi_level, rescan);
1614 scsi_autopm_put_target(starget);
1615 /* now determine if the target has any children at all
1616 * and if not, nuke it */
1617 scsi_target_reap(starget);
1619 put_device(&starget->dev);
1623 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1624 * @parent: host to scan
1625 * @channel: channel to scan
1626 * @id: target id to scan
1627 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1628 * @rescan: passed to LUN scanning routines
1631 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1632 * and possibly all LUNs on the target id.
1634 * First try a REPORT LUN scan, if that does not scan the target, do a
1635 * sequential scan of LUNs on the target id.
1637 void scsi_scan_target(struct device *parent, unsigned int channel,
1638 unsigned int id, unsigned int lun, int rescan)
1640 struct Scsi_Host *shost = dev_to_shost(parent);
1642 if (strncmp(scsi_scan_type, "none", 4) == 0)
1645 mutex_lock(&shost->scan_mutex);
1646 if (!shost->async_scan)
1647 scsi_complete_async_scans();
1649 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1650 __scsi_scan_target(parent, channel, id, lun, rescan);
1651 scsi_autopm_put_host(shost);
1653 mutex_unlock(&shost->scan_mutex);
1655 EXPORT_SYMBOL(scsi_scan_target);
1657 static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1658 unsigned int id, unsigned int lun, int rescan)
1662 if (id == SCAN_WILD_CARD)
1663 for (id = 0; id < shost->max_id; ++id) {
1665 * XXX adapter drivers when possible (FCP, iSCSI)
1666 * could modify max_id to match the current max,
1667 * not the absolute max.
1669 * XXX add a shost id iterator, so for example,
1670 * the FC ID can be the same as a target id
1671 * without a huge overhead of sparse id's.
1673 if (shost->reverse_ordering)
1675 * Scan from high to low id.
1677 order_id = shost->max_id - id - 1;
1680 __scsi_scan_target(&shost->shost_gendev, channel,
1681 order_id, lun, rescan);
1684 __scsi_scan_target(&shost->shost_gendev, channel,
1688 int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1689 unsigned int id, unsigned int lun, int rescan)
1691 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1693 __func__, channel, id, lun));
1695 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
1696 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1697 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1700 mutex_lock(&shost->scan_mutex);
1701 if (!shost->async_scan)
1702 scsi_complete_async_scans();
1704 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1705 if (channel == SCAN_WILD_CARD)
1706 for (channel = 0; channel <= shost->max_channel;
1708 scsi_scan_channel(shost, channel, id, lun,
1711 scsi_scan_channel(shost, channel, id, lun, rescan);
1712 scsi_autopm_put_host(shost);
1714 mutex_unlock(&shost->scan_mutex);
1719 static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1721 struct scsi_device *sdev;
1722 shost_for_each_device(sdev, shost) {
1723 /* target removed before the device could be added */
1724 if (sdev->sdev_state == SDEV_DEL)
1726 if (!scsi_host_scan_allowed(shost) ||
1727 scsi_sysfs_add_sdev(sdev) != 0)
1728 __scsi_remove_device(sdev);
1733 * scsi_prep_async_scan - prepare for an async scan
1734 * @shost: the host which will be scanned
1735 * Returns: a cookie to be passed to scsi_finish_async_scan()
1737 * Tells the midlayer this host is going to do an asynchronous scan.
1738 * It reserves the host's position in the scanning list and ensures
1739 * that other asynchronous scans started after this one won't affect the
1740 * ordering of the discovered devices.
1742 static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
1744 struct async_scan_data *data;
1745 unsigned long flags;
1747 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1750 if (shost->async_scan) {
1751 printk("%s called twice for host %d", __func__,
1757 data = kmalloc(sizeof(*data), GFP_KERNEL);
1760 data->shost = scsi_host_get(shost);
1763 init_completion(&data->prev_finished);
1765 mutex_lock(&shost->scan_mutex);
1766 spin_lock_irqsave(shost->host_lock, flags);
1767 shost->async_scan = 1;
1768 spin_unlock_irqrestore(shost->host_lock, flags);
1769 mutex_unlock(&shost->scan_mutex);
1771 spin_lock(&async_scan_lock);
1772 if (list_empty(&scanning_hosts))
1773 complete(&data->prev_finished);
1774 list_add_tail(&data->list, &scanning_hosts);
1775 spin_unlock(&async_scan_lock);
1785 * scsi_finish_async_scan - asynchronous scan has finished
1786 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1788 * All the devices currently attached to this host have been found.
1789 * This function announces all the devices it has found to the rest
1792 static void scsi_finish_async_scan(struct async_scan_data *data)
1794 struct Scsi_Host *shost;
1795 unsigned long flags;
1800 shost = data->shost;
1802 mutex_lock(&shost->scan_mutex);
1804 if (!shost->async_scan) {
1805 printk("%s called twice for host %d", __func__,
1808 mutex_unlock(&shost->scan_mutex);
1812 wait_for_completion(&data->prev_finished);
1814 scsi_sysfs_add_devices(shost);
1816 spin_lock_irqsave(shost->host_lock, flags);
1817 shost->async_scan = 0;
1818 spin_unlock_irqrestore(shost->host_lock, flags);
1820 mutex_unlock(&shost->scan_mutex);
1822 spin_lock(&async_scan_lock);
1823 list_del(&data->list);
1824 if (!list_empty(&scanning_hosts)) {
1825 struct async_scan_data *next = list_entry(scanning_hosts.next,
1826 struct async_scan_data, list);
1827 complete(&next->prev_finished);
1829 spin_unlock(&async_scan_lock);
1831 scsi_autopm_put_host(shost);
1832 scsi_host_put(shost);
1836 static void do_scsi_scan_host(struct Scsi_Host *shost)
1838 if (shost->hostt->scan_finished) {
1839 unsigned long start = jiffies;
1840 if (shost->hostt->scan_start)
1841 shost->hostt->scan_start(shost);
1843 while (!shost->hostt->scan_finished(shost, jiffies - start))
1846 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1851 static int do_scan_async(void *_data)
1853 struct async_scan_data *data = _data;
1854 struct Scsi_Host *shost = data->shost;
1856 do_scsi_scan_host(shost);
1857 scsi_finish_async_scan(data);
1862 * scsi_scan_host - scan the given adapter
1863 * @shost: adapter to scan
1865 void scsi_scan_host(struct Scsi_Host *shost)
1867 struct task_struct *p;
1868 struct async_scan_data *data;
1870 if (strncmp(scsi_scan_type, "none", 4) == 0)
1872 if (scsi_autopm_get_host(shost) < 0)
1875 data = scsi_prep_async_scan(shost);
1877 do_scsi_scan_host(shost);
1878 scsi_autopm_put_host(shost);
1882 p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
1884 do_scan_async(data);
1885 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
1887 EXPORT_SYMBOL(scsi_scan_host);
1889 void scsi_forget_host(struct Scsi_Host *shost)
1891 struct scsi_device *sdev;
1892 unsigned long flags;
1895 spin_lock_irqsave(shost->host_lock, flags);
1896 list_for_each_entry(sdev, &shost->__devices, siblings) {
1897 if (sdev->sdev_state == SDEV_DEL)
1899 spin_unlock_irqrestore(shost->host_lock, flags);
1900 __scsi_remove_device(sdev);
1903 spin_unlock_irqrestore(shost->host_lock, flags);
1907 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1908 * @shost: Host that needs a scsi_device
1910 * Lock status: None assumed.
1912 * Returns: The scsi_device or NULL
1915 * Attach a single scsi_device to the Scsi_Host - this should
1916 * be made to look like a "pseudo-device" that points to the
1919 * Note - this device is not accessible from any high-level
1920 * drivers (including generics), which is probably not
1921 * optimal. We can add hooks later to attach.
1923 struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1925 struct scsi_device *sdev = NULL;
1926 struct scsi_target *starget;
1928 mutex_lock(&shost->scan_mutex);
1929 if (!scsi_host_scan_allowed(shost))
1931 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1935 sdev = scsi_alloc_sdev(starget, 0, NULL);
1939 scsi_target_reap(starget);
1940 put_device(&starget->dev);
1942 mutex_unlock(&shost->scan_mutex);
1945 EXPORT_SYMBOL(scsi_get_host_dev);
1948 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1949 * @sdev: Host device to be freed
1951 * Lock status: None assumed.
1955 void scsi_free_host_dev(struct scsi_device *sdev)
1957 BUG_ON(sdev->id != sdev->host->this_id);
1959 __scsi_remove_device(sdev);
1961 EXPORT_SYMBOL(scsi_free_host_dev);