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
);
246 sdev
= kzalloc(sizeof(*sdev
) + shost
->transportt
->device_size
,
251 sdev
->vendor
= scsi_null_device_strs
;
252 sdev
->model
= scsi_null_device_strs
;
253 sdev
->rev
= scsi_null_device_strs
;
255 sdev
->queue_ramp_up_period
= SCSI_DEFAULT_RAMP_UP_PERIOD
;
256 sdev
->id
= starget
->id
;
258 sdev
->channel
= starget
->channel
;
259 sdev
->sdev_state
= SDEV_CREATED
;
260 INIT_LIST_HEAD(&sdev
->siblings
);
261 INIT_LIST_HEAD(&sdev
->same_target_siblings
);
262 INIT_LIST_HEAD(&sdev
->cmd_list
);
263 INIT_LIST_HEAD(&sdev
->starved_entry
);
264 INIT_LIST_HEAD(&sdev
->event_list
);
265 spin_lock_init(&sdev
->list_lock
);
266 INIT_WORK(&sdev
->event_work
, scsi_evt_thread
);
268 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
269 sdev
->sdev_target
= starget
;
271 /* usually NULL and set by ->slave_alloc instead */
272 sdev
->hostdata
= hostdata
;
274 /* if the device needs this changing, it may do so in the
275 * slave_configure function */
276 sdev
->max_device_blocked
= SCSI_DEFAULT_DEVICE_BLOCKED
;
279 * Some low level driver could use device->type
284 * Assume that the device will have handshaking problems,
285 * and then fix this field later if it turns out it
290 sdev
->request_queue
= scsi_alloc_queue(sdev
);
291 if (!sdev
->request_queue
) {
292 /* release fn is set up in scsi_sysfs_device_initialise, so
293 * have to free and put manually here */
294 put_device(&starget
->dev
);
299 sdev
->request_queue
->queuedata
= sdev
;
300 scsi_adjust_queue_depth(sdev
, 0, sdev
->host
->cmd_per_lun
);
302 scsi_sysfs_device_initialize(sdev
);
304 if (shost
->hostt
->slave_alloc
) {
305 ret
= shost
->hostt
->slave_alloc(sdev
);
308 * if LLDD reports slave not present, don't clutter
309 * console with alloc failure messages
312 display_failure_msg
= 0;
313 goto out_device_destroy
;
320 scsi_device_set_state(sdev
, SDEV_DEL
);
321 transport_destroy_device(&sdev
->sdev_gendev
);
322 put_device(&sdev
->sdev_dev
);
323 put_device(&sdev
->sdev_gendev
);
325 if (display_failure_msg
)
326 printk(ALLOC_FAILURE_MSG
, __func__
);
330 static void scsi_target_destroy(struct scsi_target
*starget
)
332 struct device
*dev
= &starget
->dev
;
333 struct Scsi_Host
*shost
= dev_to_shost(dev
->parent
);
336 transport_destroy_device(dev
);
337 spin_lock_irqsave(shost
->host_lock
, flags
);
338 if (shost
->hostt
->target_destroy
)
339 shost
->hostt
->target_destroy(starget
);
340 list_del_init(&starget
->siblings
);
341 spin_unlock_irqrestore(shost
->host_lock
, flags
);
345 static void scsi_target_dev_release(struct device
*dev
)
347 struct device
*parent
= dev
->parent
;
348 struct scsi_target
*starget
= to_scsi_target(dev
);
354 static struct device_type scsi_target_type
= {
355 .name
= "scsi_target",
356 .release
= scsi_target_dev_release
,
359 int scsi_is_target_device(const struct device
*dev
)
361 return dev
->type
== &scsi_target_type
;
363 EXPORT_SYMBOL(scsi_is_target_device
);
365 static struct scsi_target
*__scsi_find_target(struct device
*parent
,
366 int channel
, uint id
)
368 struct scsi_target
*starget
, *found_starget
= NULL
;
369 struct Scsi_Host
*shost
= dev_to_shost(parent
);
371 * Search for an existing target for this sdev.
373 list_for_each_entry(starget
, &shost
->__targets
, siblings
) {
374 if (starget
->id
== id
&&
375 starget
->channel
== channel
) {
376 found_starget
= starget
;
381 get_device(&found_starget
->dev
);
383 return found_starget
;
387 * scsi_alloc_target - allocate a new or find an existing target
388 * @parent: parent of the target (need not be a scsi host)
389 * @channel: target channel number (zero if no channels)
390 * @id: target id number
392 * Return an existing target if one exists, provided it hasn't already
393 * gone into STARGET_DEL state, otherwise allocate a new target.
395 * The target is returned with an incremented reference, so the caller
396 * is responsible for both reaping and doing a last put
398 static struct scsi_target
*scsi_alloc_target(struct device
*parent
,
399 int channel
, uint id
)
401 struct Scsi_Host
*shost
= dev_to_shost(parent
);
402 struct device
*dev
= NULL
;
404 const int size
= sizeof(struct scsi_target
)
405 + shost
->transportt
->target_size
;
406 struct scsi_target
*starget
;
407 struct scsi_target
*found_target
;
410 starget
= kzalloc(size
, GFP_KERNEL
);
412 printk(KERN_ERR
"%s: allocation failure\n", __func__
);
416 device_initialize(dev
);
417 starget
->reap_ref
= 1;
418 dev
->parent
= get_device(parent
);
419 dev_set_name(dev
, "target%d:%d:%d", shost
->host_no
, channel
, id
);
420 #ifndef CONFIG_SYSFS_DEPRECATED
421 dev
->bus
= &scsi_bus_type
;
423 dev
->type
= &scsi_target_type
;
425 starget
->channel
= channel
;
426 starget
->can_queue
= 0;
427 INIT_LIST_HEAD(&starget
->siblings
);
428 INIT_LIST_HEAD(&starget
->devices
);
429 starget
->state
= STARGET_CREATED
;
430 starget
->scsi_level
= SCSI_2
;
431 starget
->max_target_blocked
= SCSI_DEFAULT_TARGET_BLOCKED
;
433 spin_lock_irqsave(shost
->host_lock
, flags
);
435 found_target
= __scsi_find_target(parent
, channel
, id
);
439 list_add_tail(&starget
->siblings
, &shost
->__targets
);
440 spin_unlock_irqrestore(shost
->host_lock
, flags
);
441 /* allocate and add */
442 transport_setup_device(dev
);
443 if (shost
->hostt
->target_alloc
) {
444 error
= shost
->hostt
->target_alloc(starget
);
447 dev_printk(KERN_ERR
, dev
, "target allocation failed, error %d\n", error
);
448 /* don't want scsi_target_reap to do the final
449 * put because it will be under the host lock */
450 scsi_target_destroy(starget
);
459 found_target
->reap_ref
++;
460 spin_unlock_irqrestore(shost
->host_lock
, flags
);
461 if (found_target
->state
!= STARGET_DEL
) {
466 /* Unfortunately, we found a dying target; need to
467 * wait until it's dead before we can get a new one */
468 put_device(&found_target
->dev
);
469 flush_scheduled_work();
473 static void scsi_target_reap_usercontext(struct work_struct
*work
)
475 struct scsi_target
*starget
=
476 container_of(work
, struct scsi_target
, ew
.work
);
478 transport_remove_device(&starget
->dev
);
479 device_del(&starget
->dev
);
480 scsi_target_destroy(starget
);
484 * scsi_target_reap - check to see if target is in use and destroy if not
485 * @starget: target to be checked
487 * This is used after removing a LUN or doing a last put of the target
488 * it checks atomically that nothing is using the target and removes
491 void scsi_target_reap(struct scsi_target
*starget
)
493 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
495 enum scsi_target_state state
;
498 spin_lock_irqsave(shost
->host_lock
, flags
);
499 state
= starget
->state
;
500 empty
= --starget
->reap_ref
== 0 &&
501 list_empty(&starget
->devices
) ? 1 : 0;
502 spin_unlock_irqrestore(shost
->host_lock
, flags
);
507 BUG_ON(state
== STARGET_DEL
);
508 starget
->state
= STARGET_DEL
;
509 if (state
== STARGET_CREATED
)
510 scsi_target_destroy(starget
);
512 execute_in_process_context(scsi_target_reap_usercontext
,
517 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
518 * @s: INQUIRY result string to sanitize
519 * @len: length of the string
522 * The SCSI spec says that INQUIRY vendor, product, and revision
523 * strings must consist entirely of graphic ASCII characters,
524 * padded on the right with spaces. Since not all devices obey
525 * this rule, we will replace non-graphic or non-ASCII characters
526 * with spaces. Exception: a NUL character is interpreted as a
527 * string terminator, so all the following characters are set to
530 static void sanitize_inquiry_string(unsigned char *s
, int len
)
534 for (; len
> 0; (--len
, ++s
)) {
537 if (terminated
|| *s
< 0x20 || *s
> 0x7e)
543 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
544 * @sdev: scsi_device to probe
545 * @inq_result: area to store the INQUIRY result
546 * @result_len: len of inq_result
547 * @bflags: store any bflags found here
550 * Probe the lun associated with @req using a standard SCSI INQUIRY;
552 * If the INQUIRY is successful, zero is returned and the
553 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
554 * are copied to the scsi_device any flags value is stored in *@bflags.
556 static int scsi_probe_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
557 int result_len
, int *bflags
)
559 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
560 int first_inquiry_len
, try_inquiry_len
, next_inquiry_len
;
561 int response_len
= 0;
562 int pass
, count
, result
;
563 struct scsi_sense_hdr sshdr
;
567 /* Perform up to 3 passes. The first pass uses a conservative
568 * transfer length of 36 unless sdev->inquiry_len specifies a
569 * different value. */
570 first_inquiry_len
= sdev
->inquiry_len
? sdev
->inquiry_len
: 36;
571 try_inquiry_len
= first_inquiry_len
;
575 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
576 "scsi scan: INQUIRY pass %d length %d\n",
577 pass
, try_inquiry_len
));
579 /* Each pass gets up to three chances to ignore Unit Attention */
580 for (count
= 0; count
< 3; ++count
) {
583 memset(scsi_cmd
, 0, 6);
584 scsi_cmd
[0] = INQUIRY
;
585 scsi_cmd
[4] = (unsigned char) try_inquiry_len
;
587 memset(inq_result
, 0, try_inquiry_len
);
589 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
590 inq_result
, try_inquiry_len
, &sshdr
,
591 HZ
/ 2 + HZ
* scsi_inq_timeout
, 3,
594 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: INQUIRY %s "
596 result
? "failed" : "successful", result
));
600 * not-ready to ready transition [asc/ascq=0x28/0x0]
601 * or power-on, reset [asc/ascq=0x29/0x0], continue.
602 * INQUIRY should not yield UNIT_ATTENTION
603 * but many buggy devices do so anyway.
605 if ((driver_byte(result
) & DRIVER_SENSE
) &&
606 scsi_sense_valid(&sshdr
)) {
607 if ((sshdr
.sense_key
== UNIT_ATTENTION
) &&
608 ((sshdr
.asc
== 0x28) ||
609 (sshdr
.asc
== 0x29)) &&
615 * if nothing was transferred, we try
616 * again. It's a workaround for some USB
619 if (resid
== try_inquiry_len
)
626 sanitize_inquiry_string(&inq_result
[8], 8);
627 sanitize_inquiry_string(&inq_result
[16], 16);
628 sanitize_inquiry_string(&inq_result
[32], 4);
630 response_len
= inq_result
[4] + 5;
631 if (response_len
> 255)
632 response_len
= first_inquiry_len
; /* sanity */
635 * Get any flags for this device.
637 * XXX add a bflags to scsi_device, and replace the
638 * corresponding bit fields in scsi_device, so bflags
639 * need not be passed as an argument.
641 *bflags
= scsi_get_device_flags(sdev
, &inq_result
[8],
644 /* When the first pass succeeds we gain information about
645 * what larger transfer lengths might work. */
647 if (BLIST_INQUIRY_36
& *bflags
)
648 next_inquiry_len
= 36;
649 else if (BLIST_INQUIRY_58
& *bflags
)
650 next_inquiry_len
= 58;
651 else if (sdev
->inquiry_len
)
652 next_inquiry_len
= sdev
->inquiry_len
;
654 next_inquiry_len
= response_len
;
656 /* If more data is available perform the second pass */
657 if (next_inquiry_len
> try_inquiry_len
) {
658 try_inquiry_len
= next_inquiry_len
;
664 } else if (pass
== 2) {
665 printk(KERN_INFO
"scsi scan: %d byte inquiry failed. "
666 "Consider BLIST_INQUIRY_36 for this device\n",
669 /* If this pass failed, the third pass goes back and transfers
670 * the same amount as we successfully got in the first pass. */
671 try_inquiry_len
= first_inquiry_len
;
676 /* If the last transfer attempt got an error, assume the
677 * peripheral doesn't exist or is dead. */
681 /* Don't report any more data than the device says is valid */
682 sdev
->inquiry_len
= min(try_inquiry_len
, response_len
);
685 * XXX Abort if the response length is less than 36? If less than
686 * 32, the lookup of the device flags (above) could be invalid,
687 * and it would be possible to take an incorrect action - we do
688 * not want to hang because of a short INQUIRY. On the flip side,
689 * if the device is spun down or becoming ready (and so it gives a
690 * short INQUIRY), an abort here prevents any further use of the
691 * device, including spin up.
693 * On the whole, the best approach seems to be to assume the first
694 * 36 bytes are valid no matter what the device says. That's
695 * better than copying < 36 bytes to the inquiry-result buffer
696 * and displaying garbage for the Vendor, Product, or Revision
699 if (sdev
->inquiry_len
< 36) {
700 printk(KERN_INFO
"scsi scan: INQUIRY result too short (%d),"
701 " using 36\n", sdev
->inquiry_len
);
702 sdev
->inquiry_len
= 36;
706 * Related to the above issue:
708 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
709 * and if not ready, sent a START_STOP to start (maybe spin up) and
710 * then send the INQUIRY again, since the INQUIRY can change after
711 * a device is initialized.
713 * Ideally, start a device if explicitly asked to do so. This
714 * assumes that a device is spun up on power on, spun down on
715 * request, and then spun up on request.
719 * The scanning code needs to know the scsi_level, even if no
720 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
721 * non-zero LUNs can be scanned.
723 sdev
->scsi_level
= inq_result
[2] & 0x07;
724 if (sdev
->scsi_level
>= 2 ||
725 (sdev
->scsi_level
== 1 && (inq_result
[3] & 0x0f) == 1))
727 sdev
->sdev_target
->scsi_level
= sdev
->scsi_level
;
733 * scsi_add_lun - allocate and fully initialze a scsi_device
734 * @sdev: holds information to be stored in the new scsi_device
735 * @inq_result: holds the result of a previous INQUIRY to the LUN
736 * @bflags: black/white list flag
737 * @async: 1 if this device is being scanned asynchronously
740 * Initialize the scsi_device @sdev. Optionally set fields based
741 * on values in *@bflags.
744 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
745 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
747 static int scsi_add_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
748 int *bflags
, int async
)
753 * XXX do not save the inquiry, since it can change underneath us,
754 * save just vendor/model/rev.
756 * Rather than save it and have an ioctl that retrieves the saved
757 * value, have an ioctl that executes the same INQUIRY code used
758 * in scsi_probe_lun, let user level programs doing INQUIRY
759 * scanning run at their own risk, or supply a user level program
760 * that can correctly scan.
764 * Copy at least 36 bytes of INQUIRY data, so that we don't
765 * dereference unallocated memory when accessing the Vendor,
766 * Product, and Revision strings. Badly behaved devices may set
767 * the INQUIRY Additional Length byte to a small value, indicating
768 * these strings are invalid, but often they contain plausible data
769 * nonetheless. It doesn't matter if the device sent < 36 bytes
770 * total, since scsi_probe_lun() initializes inq_result with 0s.
772 sdev
->inquiry
= kmemdup(inq_result
,
773 max_t(size_t, sdev
->inquiry_len
, 36),
775 if (sdev
->inquiry
== NULL
)
776 return SCSI_SCAN_NO_RESPONSE
;
778 sdev
->vendor
= (char *) (sdev
->inquiry
+ 8);
779 sdev
->model
= (char *) (sdev
->inquiry
+ 16);
780 sdev
->rev
= (char *) (sdev
->inquiry
+ 32);
782 if (*bflags
& BLIST_ISROM
) {
783 sdev
->type
= TYPE_ROM
;
786 sdev
->type
= (inq_result
[0] & 0x1f);
787 sdev
->removable
= (inq_result
[1] & 0x80) >> 7;
790 switch (sdev
->type
) {
798 case TYPE_MEDIUM_CHANGER
:
810 printk(KERN_INFO
"scsi: unknown device type %d\n", sdev
->type
);
813 if (sdev
->type
== TYPE_RBC
|| sdev
->type
== TYPE_ROM
) {
814 /* RBC and MMC devices can return SCSI-3 compliance and yet
815 * still not support REPORT LUNS, so make them act as
816 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
817 * specifically set */
818 if ((*bflags
& BLIST_REPORTLUN2
) == 0)
819 *bflags
|= BLIST_NOREPORTLUN
;
823 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
824 * spec says: The device server is capable of supporting the
825 * specified peripheral device type on this logical unit. However,
826 * the physical device is not currently connected to this logical
829 * The above is vague, as it implies that we could treat 001 and
830 * 011 the same. Stay compatible with previous code, and create a
831 * scsi_device for a PQ of 1
833 * Don't set the device offline here; rather let the upper
834 * level drivers eval the PQ to decide whether they should
835 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
838 sdev
->inq_periph_qual
= (inq_result
[0] >> 5) & 7;
839 sdev
->lockable
= sdev
->removable
;
840 sdev
->soft_reset
= (inq_result
[7] & 1) && ((inq_result
[3] & 7) == 2);
842 if (sdev
->scsi_level
>= SCSI_3
||
843 (sdev
->inquiry_len
> 56 && inq_result
[56] & 0x04))
845 if (inq_result
[7] & 0x60)
847 if (inq_result
[7] & 0x10)
850 sdev_printk(KERN_NOTICE
, sdev
, "%s %.8s %.16s %.4s PQ: %d "
851 "ANSI: %d%s\n", scsi_device_type(sdev
->type
),
852 sdev
->vendor
, sdev
->model
, sdev
->rev
,
853 sdev
->inq_periph_qual
, inq_result
[2] & 0x07,
854 (inq_result
[3] & 0x0f) == 1 ? " CCS" : "");
856 if ((sdev
->scsi_level
>= SCSI_2
) && (inq_result
[7] & 2) &&
857 !(*bflags
& BLIST_NOTQ
))
858 sdev
->tagged_supported
= 1;
861 * Some devices (Texel CD ROM drives) have handshaking problems
862 * when used with the Seagate controllers. borken is initialized
863 * to 1, and then set it to 0 here.
865 if ((*bflags
& BLIST_BORKEN
) == 0)
868 if (*bflags
& BLIST_NO_ULD_ATTACH
)
869 sdev
->no_uld_attach
= 1;
872 * Apparently some really broken devices (contrary to the SCSI
873 * standards) need to be selected without asserting ATN
875 if (*bflags
& BLIST_SELECT_NO_ATN
)
876 sdev
->select_no_atn
= 1;
879 * Maximum 512 sector transfer length
880 * broken RA4x00 Compaq Disk Array
882 if (*bflags
& BLIST_MAX_512
)
883 blk_queue_max_hw_sectors(sdev
->request_queue
, 512);
886 * Some devices may not want to have a start command automatically
887 * issued when a device is added.
889 if (*bflags
& BLIST_NOSTARTONADD
)
890 sdev
->no_start_on_add
= 1;
892 if (*bflags
& BLIST_SINGLELUN
)
893 scsi_target(sdev
)->single_lun
= 1;
895 sdev
->use_10_for_rw
= 1;
897 if (*bflags
& BLIST_MS_SKIP_PAGE_08
)
898 sdev
->skip_ms_page_8
= 1;
900 if (*bflags
& BLIST_MS_SKIP_PAGE_3F
)
901 sdev
->skip_ms_page_3f
= 1;
903 if (*bflags
& BLIST_USE_10_BYTE_MS
)
904 sdev
->use_10_for_ms
= 1;
906 /* set the device running here so that slave configure
908 ret
= scsi_device_set_state(sdev
, SDEV_RUNNING
);
910 ret
= scsi_device_set_state(sdev
, SDEV_BLOCK
);
913 sdev_printk(KERN_ERR
, sdev
,
914 "in wrong state %s to complete scan\n",
915 scsi_device_state_name(sdev
->sdev_state
));
916 return SCSI_SCAN_NO_RESPONSE
;
920 if (*bflags
& BLIST_MS_192_BYTES_FOR_3F
)
921 sdev
->use_192_bytes_for_3f
= 1;
923 if (*bflags
& BLIST_NOT_LOCKABLE
)
926 if (*bflags
& BLIST_RETRY_HWERROR
)
927 sdev
->retry_hwerror
= 1;
929 transport_configure_device(&sdev
->sdev_gendev
);
931 if (sdev
->host
->hostt
->slave_configure
) {
932 ret
= sdev
->host
->hostt
->slave_configure(sdev
);
935 * if LLDD reports slave not present, don't clutter
936 * console with alloc failure messages
939 sdev_printk(KERN_ERR
, sdev
,
940 "failed to configure device\n");
942 return SCSI_SCAN_NO_RESPONSE
;
946 sdev
->max_queue_depth
= sdev
->queue_depth
;
949 * Ok, the device is now all set up, we can
950 * register it and tell the rest of the kernel
953 if (!async
&& scsi_sysfs_add_sdev(sdev
) != 0)
954 return SCSI_SCAN_NO_RESPONSE
;
956 return SCSI_SCAN_LUN_PRESENT
;
959 #ifdef CONFIG_SCSI_LOGGING
961 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
962 * @buf: Output buffer with at least end-first+1 bytes of space
963 * @inq: Inquiry buffer (input)
964 * @first: Offset of string into inq
965 * @end: Index after last character in inq
967 static unsigned char *scsi_inq_str(unsigned char *buf
, unsigned char *inq
,
968 unsigned first
, unsigned end
)
970 unsigned term
= 0, idx
;
972 for (idx
= 0; idx
+ first
< end
&& idx
+ first
< inq
[4] + 5; idx
++) {
973 if (inq
[idx
+first
] > ' ') {
974 buf
[idx
] = inq
[idx
+first
];
986 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
987 * @starget: pointer to target device structure
988 * @lun: LUN of target device
989 * @bflagsp: store bflags here if not NULL
990 * @sdevp: probe the LUN corresponding to this scsi_device
991 * @rescan: if nonzero skip some code only needed on first scan
992 * @hostdata: passed to scsi_alloc_sdev()
995 * Call scsi_probe_lun, if a LUN with an attached device is found,
996 * allocate and set it up by calling scsi_add_lun.
999 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
1000 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1001 * attached at the LUN
1002 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
1004 static int scsi_probe_and_add_lun(struct scsi_target
*starget
,
1005 uint lun
, int *bflagsp
,
1006 struct scsi_device
**sdevp
, int rescan
,
1009 struct scsi_device
*sdev
;
1010 unsigned char *result
;
1011 int bflags
, res
= SCSI_SCAN_NO_RESPONSE
, result_len
= 256;
1012 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1015 * The rescan flag is used as an optimization, the first scan of a
1016 * host adapter calls into here with rescan == 0.
1018 sdev
= scsi_device_lookup_by_target(starget
, lun
);
1020 if (rescan
|| !scsi_device_created(sdev
)) {
1021 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1022 "scsi scan: device exists on %s\n",
1023 dev_name(&sdev
->sdev_gendev
)));
1027 scsi_device_put(sdev
);
1030 *bflagsp
= scsi_get_device_flags(sdev
,
1033 return SCSI_SCAN_LUN_PRESENT
;
1035 scsi_device_put(sdev
);
1037 sdev
= scsi_alloc_sdev(starget
, lun
, hostdata
);
1041 result
= kmalloc(result_len
, GFP_ATOMIC
|
1042 ((shost
->unchecked_isa_dma
) ? __GFP_DMA
: 0));
1046 if (scsi_probe_lun(sdev
, result
, result_len
, &bflags
))
1047 goto out_free_result
;
1052 * result contains valid SCSI INQUIRY data.
1054 if (((result
[0] >> 5) == 3) && !(bflags
& BLIST_ATTACH_PQ3
)) {
1056 * For a Peripheral qualifier 3 (011b), the SCSI
1057 * spec says: The device server is not capable of
1058 * supporting a physical device on this logical
1061 * For disks, this implies that there is no
1062 * logical disk configured at sdev->lun, but there
1063 * is a target id responding.
1065 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO
, sdev
, "scsi scan:"
1066 " peripheral qualifier of 3, device not"
1069 SCSI_LOG_SCAN_BUS(1, {
1070 unsigned char vend
[9];
1071 unsigned char mod
[17];
1073 sdev_printk(KERN_INFO
, sdev
,
1074 "scsi scan: consider passing scsi_mod."
1075 "dev_flags=%s:%s:0x240 or 0x1000240\n",
1076 scsi_inq_str(vend
, result
, 8, 16),
1077 scsi_inq_str(mod
, result
, 16, 32));
1082 res
= SCSI_SCAN_TARGET_PRESENT
;
1083 goto out_free_result
;
1087 * Some targets may set slight variations of PQ and PDT to signal
1088 * that no LUN is present, so don't add sdev in these cases.
1089 * Two specific examples are:
1090 * 1) NetApp targets: return PQ=1, PDT=0x1f
1091 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1092 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1095 * 1) SCSI SPC-3, pp. 145-146
1096 * PQ=1: "A peripheral device having the specified peripheral
1097 * device type is not connected to this logical unit. However, the
1098 * device server is capable of supporting the specified peripheral
1099 * device type on this logical unit."
1100 * PDT=0x1f: "Unknown or no device type"
1101 * 2) USB UFI 1.0, p. 20
1102 * PDT=00h Direct-access device (floppy)
1103 * PDT=1Fh none (no FDD connected to the requested logical unit)
1105 if (((result
[0] >> 5) == 1 || starget
->pdt_1f_for_no_lun
) &&
1106 (result
[0] & 0x1f) == 0x1f &&
1107 !scsi_is_wlun(lun
)) {
1108 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1109 "scsi scan: peripheral device type"
1110 " of 31, no device added\n"));
1111 res
= SCSI_SCAN_TARGET_PRESENT
;
1112 goto out_free_result
;
1115 res
= scsi_add_lun(sdev
, result
, &bflags
, shost
->async_scan
);
1116 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1117 if (bflags
& BLIST_KEY
) {
1119 scsi_unlock_floptical(sdev
, result
);
1126 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1128 if (scsi_device_get(sdev
) == 0) {
1131 __scsi_remove_device(sdev
);
1132 res
= SCSI_SCAN_NO_RESPONSE
;
1136 __scsi_remove_device(sdev
);
1142 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1143 * @starget: pointer to target structure to scan
1144 * @bflags: black/white list flag for LUN 0
1145 * @scsi_level: Which version of the standard does this device adhere to
1146 * @rescan: passed to scsi_probe_add_lun()
1149 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1150 * scanned) to some maximum lun until a LUN is found with no device
1151 * attached. Use the bflags to figure out any oddities.
1153 * Modifies sdevscan->lun.
1155 static void scsi_sequential_lun_scan(struct scsi_target
*starget
,
1156 int bflags
, int scsi_level
, int rescan
)
1158 unsigned int sparse_lun
, lun
, max_dev_lun
;
1159 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1161 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: Sequential scan of"
1162 "%s\n", dev_name(&starget
->dev
)));
1164 max_dev_lun
= min(max_scsi_luns
, shost
->max_lun
);
1166 * If this device is known to support sparse multiple units,
1167 * override the other settings, and scan all of them. Normally,
1168 * SCSI-3 devices should be scanned via the REPORT LUNS.
1170 if (bflags
& BLIST_SPARSELUN
) {
1171 max_dev_lun
= shost
->max_lun
;
1177 * If less than SCSI_1_CSS, and no special lun scaning, stop
1178 * scanning; this matches 2.4 behaviour, but could just be a bug
1179 * (to continue scanning a SCSI_1_CSS device).
1181 * This test is broken. We might not have any device on lun0 for
1182 * a sparselun device, and if that's the case then how would we
1183 * know the real scsi_level, eh? It might make sense to just not
1184 * scan any SCSI_1 device for non-0 luns, but that check would best
1185 * go into scsi_alloc_sdev() and just have it return null when asked
1186 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1188 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1189 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1194 * If this device is known to support multiple units, override
1195 * the other settings, and scan all of them.
1197 if (bflags
& BLIST_FORCELUN
)
1198 max_dev_lun
= shost
->max_lun
;
1200 * REGAL CDC-4X: avoid hang after LUN 4
1202 if (bflags
& BLIST_MAX5LUN
)
1203 max_dev_lun
= min(5U, max_dev_lun
);
1205 * Do not scan SCSI-2 or lower device past LUN 7, unless
1208 if (scsi_level
< SCSI_3
&& !(bflags
& BLIST_LARGELUN
))
1209 max_dev_lun
= min(8U, max_dev_lun
);
1212 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1213 * until we reach the max, or no LUN is found and we are not
1216 for (lun
= 1; lun
< max_dev_lun
; ++lun
)
1217 if ((scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
,
1218 NULL
) != SCSI_SCAN_LUN_PRESENT
) &&
1224 * scsilun_to_int: convert a scsi_lun to an int
1225 * @scsilun: struct scsi_lun to be converted.
1228 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1229 * integer, and return the result. The caller must check for
1230 * truncation before using this function.
1233 * The struct scsi_lun is assumed to be four levels, with each level
1234 * effectively containing a SCSI byte-ordered (big endian) short; the
1235 * addressing bits of each level are ignored (the highest two bits).
1236 * For a description of the LUN format, post SCSI-3 see the SCSI
1237 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1239 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1240 * the integer: 0x0b030a04
1242 int scsilun_to_int(struct scsi_lun
*scsilun
)
1248 for (i
= 0; i
< sizeof(lun
); i
+= 2)
1249 lun
= lun
| (((scsilun
->scsi_lun
[i
] << 8) |
1250 scsilun
->scsi_lun
[i
+ 1]) << (i
* 8));
1253 EXPORT_SYMBOL(scsilun_to_int
);
1256 * int_to_scsilun: reverts an int into a scsi_lun
1257 * @lun: integer to be reverted
1258 * @scsilun: struct scsi_lun to be set.
1261 * Reverts the functionality of the scsilun_to_int, which packed
1262 * an 8-byte lun value into an int. This routine unpacks the int
1263 * back into the lun value.
1264 * Note: the scsilun_to_int() routine does not truly handle all
1265 * 8bytes of the lun value. This functions restores only as much
1266 * as was set by the routine.
1269 * Given an integer : 0x0b030a04, this function returns a
1270 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1273 void int_to_scsilun(unsigned int lun
, struct scsi_lun
*scsilun
)
1277 memset(scsilun
->scsi_lun
, 0, sizeof(scsilun
->scsi_lun
));
1279 for (i
= 0; i
< sizeof(lun
); i
+= 2) {
1280 scsilun
->scsi_lun
[i
] = (lun
>> 8) & 0xFF;
1281 scsilun
->scsi_lun
[i
+1] = lun
& 0xFF;
1285 EXPORT_SYMBOL(int_to_scsilun
);
1288 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1289 * @starget: which target
1290 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1291 * @rescan: nonzero if we can skip code only needed on first scan
1294 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1295 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
1297 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1298 * LUNs even if it's older than SCSI-3.
1299 * If BLIST_NOREPORTLUN is set, return 1 always.
1300 * If BLIST_NOLUN is set, return 0 always.
1303 * 0: scan completed (or no memory, so further scanning is futile)
1304 * 1: could not scan with REPORT LUN
1306 static int scsi_report_lun_scan(struct scsi_target
*starget
, int bflags
,
1310 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
1311 unsigned int length
;
1313 unsigned int num_luns
;
1314 unsigned int retries
;
1316 struct scsi_lun
*lunp
, *lun_data
;
1318 struct scsi_sense_hdr sshdr
;
1319 struct scsi_device
*sdev
;
1320 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
1324 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1325 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1326 * support more than 8 LUNs.
1328 if (bflags
& BLIST_NOREPORTLUN
)
1330 if (starget
->scsi_level
< SCSI_2
&&
1331 starget
->scsi_level
!= SCSI_UNKNOWN
)
1333 if (starget
->scsi_level
< SCSI_3
&&
1334 (!(bflags
& BLIST_REPORTLUN2
) || shost
->max_lun
<= 8))
1336 if (bflags
& BLIST_NOLUN
)
1339 if (!(sdev
= scsi_device_lookup_by_target(starget
, 0))) {
1340 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1343 if (scsi_device_get(sdev
)) {
1344 __scsi_remove_device(sdev
);
1349 sprintf(devname
, "host %d channel %d id %d",
1350 shost
->host_no
, sdev
->channel
, sdev
->id
);
1353 * Allocate enough to hold the header (the same size as one scsi_lun)
1354 * plus the max number of luns we are requesting.
1356 * Reallocating and trying again (with the exact amount we need)
1357 * would be nice, but then we need to somehow limit the size
1358 * allocated based on the available memory and the limits of
1359 * kmalloc - we don't want a kmalloc() failure of a huge value to
1360 * prevent us from finding any LUNs on this target.
1362 length
= (max_scsi_report_luns
+ 1) * sizeof(struct scsi_lun
);
1363 lun_data
= kmalloc(length
, GFP_ATOMIC
|
1364 (sdev
->host
->unchecked_isa_dma
? __GFP_DMA
: 0));
1366 printk(ALLOC_FAILURE_MSG
, __func__
);
1370 scsi_cmd
[0] = REPORT_LUNS
;
1373 * bytes 1 - 5: reserved, set to zero.
1375 memset(&scsi_cmd
[1], 0, 5);
1378 * bytes 6 - 9: length of the command.
1380 scsi_cmd
[6] = (unsigned char) (length
>> 24) & 0xff;
1381 scsi_cmd
[7] = (unsigned char) (length
>> 16) & 0xff;
1382 scsi_cmd
[8] = (unsigned char) (length
>> 8) & 0xff;
1383 scsi_cmd
[9] = (unsigned char) length
& 0xff;
1385 scsi_cmd
[10] = 0; /* reserved */
1386 scsi_cmd
[11] = 0; /* control */
1389 * We can get a UNIT ATTENTION, for example a power on/reset, so
1390 * retry a few times (like sd.c does for TEST UNIT READY).
1391 * Experience shows some combinations of adapter/devices get at
1392 * least two power on/resets.
1394 * Illegal requests (for devices that do not support REPORT LUNS)
1395 * should come through as a check condition, and will not generate
1398 for (retries
= 0; retries
< 3; retries
++) {
1399 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: Sending"
1400 " REPORT LUNS to %s (try %d)\n", devname
,
1403 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
1404 lun_data
, length
, &sshdr
,
1405 SCSI_TIMEOUT
+ 4 * HZ
, 3, NULL
);
1407 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: REPORT LUNS"
1408 " %s (try %d) result 0x%x\n", result
1409 ? "failed" : "successful", retries
, result
));
1412 else if (scsi_sense_valid(&sshdr
)) {
1413 if (sshdr
.sense_key
!= UNIT_ATTENTION
)
1420 * The device probably does not support a REPORT LUN command
1427 * Get the length from the first four bytes of lun_data.
1429 data
= (u8
*) lun_data
->scsi_lun
;
1430 length
= ((data
[0] << 24) | (data
[1] << 16) |
1431 (data
[2] << 8) | (data
[3] << 0));
1433 num_luns
= (length
/ sizeof(struct scsi_lun
));
1434 if (num_luns
> max_scsi_report_luns
) {
1435 printk(KERN_WARNING
"scsi: On %s only %d (max_scsi_report_luns)"
1436 " of %d luns reported, try increasing"
1437 " max_scsi_report_luns.\n", devname
,
1438 max_scsi_report_luns
, num_luns
);
1439 num_luns
= max_scsi_report_luns
;
1442 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1443 "scsi scan: REPORT LUN scan\n"));
1446 * Scan the luns in lun_data. The entry at offset 0 is really
1447 * the header, so start at 1 and go up to and including num_luns.
1449 for (lunp
= &lun_data
[1]; lunp
<= &lun_data
[num_luns
]; lunp
++) {
1450 lun
= scsilun_to_int(lunp
);
1453 * Check if the unused part of lunp is non-zero, and so
1454 * does not fit in lun.
1456 if (memcmp(&lunp
->scsi_lun
[sizeof(lun
)], "\0\0\0\0", 4)) {
1460 * Output an error displaying the LUN in byte order,
1461 * this differs from what linux would print for the
1462 * integer LUN value.
1464 printk(KERN_WARNING
"scsi: %s lun 0x", devname
);
1465 data
= (char *)lunp
->scsi_lun
;
1466 for (i
= 0; i
< sizeof(struct scsi_lun
); i
++)
1467 printk("%02x", data
[i
]);
1468 printk(" has a LUN larger than currently supported.\n");
1469 } else if (lun
> sdev
->host
->max_lun
) {
1470 printk(KERN_WARNING
"scsi: %s lun%d has a LUN larger"
1471 " than allowed by the host adapter\n",
1476 res
= scsi_probe_and_add_lun(starget
,
1477 lun
, NULL
, NULL
, rescan
, NULL
);
1478 if (res
== SCSI_SCAN_NO_RESPONSE
) {
1480 * Got some results, but now none, abort.
1482 sdev_printk(KERN_ERR
, sdev
,
1483 "Unexpected response"
1484 " from lun %d while scanning, scan"
1494 scsi_device_put(sdev
);
1495 if (scsi_device_created(sdev
))
1497 * the sdev we used didn't appear in the report luns scan
1499 __scsi_remove_device(sdev
);
1503 struct scsi_device
*__scsi_add_device(struct Scsi_Host
*shost
, uint channel
,
1504 uint id
, uint lun
, void *hostdata
)
1506 struct scsi_device
*sdev
= ERR_PTR(-ENODEV
);
1507 struct device
*parent
= &shost
->shost_gendev
;
1508 struct scsi_target
*starget
;
1510 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1511 return ERR_PTR(-ENODEV
);
1513 starget
= scsi_alloc_target(parent
, channel
, id
);
1515 return ERR_PTR(-ENOMEM
);
1517 mutex_lock(&shost
->scan_mutex
);
1518 if (!shost
->async_scan
)
1519 scsi_complete_async_scans();
1521 if (scsi_host_scan_allowed(shost
))
1522 scsi_probe_and_add_lun(starget
, lun
, NULL
, &sdev
, 1, hostdata
);
1523 mutex_unlock(&shost
->scan_mutex
);
1524 scsi_target_reap(starget
);
1525 put_device(&starget
->dev
);
1529 EXPORT_SYMBOL(__scsi_add_device
);
1531 int scsi_add_device(struct Scsi_Host
*host
, uint channel
,
1532 uint target
, uint lun
)
1534 struct scsi_device
*sdev
=
1535 __scsi_add_device(host
, channel
, target
, lun
, NULL
);
1537 return PTR_ERR(sdev
);
1539 scsi_device_put(sdev
);
1542 EXPORT_SYMBOL(scsi_add_device
);
1544 void scsi_rescan_device(struct device
*dev
)
1546 struct scsi_driver
*drv
;
1551 drv
= to_scsi_driver(dev
->driver
);
1552 if (try_module_get(drv
->owner
)) {
1555 module_put(drv
->owner
);
1558 EXPORT_SYMBOL(scsi_rescan_device
);
1560 static void __scsi_scan_target(struct device
*parent
, unsigned int channel
,
1561 unsigned int id
, unsigned int lun
, int rescan
)
1563 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1566 struct scsi_target
*starget
;
1568 if (shost
->this_id
== id
)
1570 * Don't scan the host adapter
1574 starget
= scsi_alloc_target(parent
, channel
, id
);
1578 if (lun
!= SCAN_WILD_CARD
) {
1580 * Scan for a specific host/chan/id/lun.
1582 scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
, NULL
);
1587 * Scan LUN 0, if there is some response, scan further. Ideally, we
1588 * would not configure LUN 0 until all LUNs are scanned.
1590 res
= scsi_probe_and_add_lun(starget
, 0, &bflags
, NULL
, rescan
, NULL
);
1591 if (res
== SCSI_SCAN_LUN_PRESENT
|| res
== SCSI_SCAN_TARGET_PRESENT
) {
1592 if (scsi_report_lun_scan(starget
, bflags
, rescan
) != 0)
1594 * The REPORT LUN did not scan the target,
1595 * do a sequential scan.
1597 scsi_sequential_lun_scan(starget
, bflags
,
1598 starget
->scsi_level
, rescan
);
1602 /* now determine if the target has any children at all
1603 * and if not, nuke it */
1604 scsi_target_reap(starget
);
1606 put_device(&starget
->dev
);
1610 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1611 * @parent: host to scan
1612 * @channel: channel to scan
1613 * @id: target id to scan
1614 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1615 * @rescan: passed to LUN scanning routines
1618 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1619 * and possibly all LUNs on the target id.
1621 * First try a REPORT LUN scan, if that does not scan the target, do a
1622 * sequential scan of LUNs on the target id.
1624 void scsi_scan_target(struct device
*parent
, unsigned int channel
,
1625 unsigned int id
, unsigned int lun
, int rescan
)
1627 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1629 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1632 mutex_lock(&shost
->scan_mutex
);
1633 if (!shost
->async_scan
)
1634 scsi_complete_async_scans();
1636 if (scsi_host_scan_allowed(shost
))
1637 __scsi_scan_target(parent
, channel
, id
, lun
, rescan
);
1638 mutex_unlock(&shost
->scan_mutex
);
1640 EXPORT_SYMBOL(scsi_scan_target
);
1642 static void scsi_scan_channel(struct Scsi_Host
*shost
, unsigned int channel
,
1643 unsigned int id
, unsigned int lun
, int rescan
)
1647 if (id
== SCAN_WILD_CARD
)
1648 for (id
= 0; id
< shost
->max_id
; ++id
) {
1650 * XXX adapter drivers when possible (FCP, iSCSI)
1651 * could modify max_id to match the current max,
1652 * not the absolute max.
1654 * XXX add a shost id iterator, so for example,
1655 * the FC ID can be the same as a target id
1656 * without a huge overhead of sparse id's.
1658 if (shost
->reverse_ordering
)
1660 * Scan from high to low id.
1662 order_id
= shost
->max_id
- id
- 1;
1665 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1666 order_id
, lun
, rescan
);
1669 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1673 int scsi_scan_host_selected(struct Scsi_Host
*shost
, unsigned int channel
,
1674 unsigned int id
, unsigned int lun
, int rescan
)
1676 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO
, shost
,
1678 __func__
, channel
, id
, lun
));
1680 if (((channel
!= SCAN_WILD_CARD
) && (channel
> shost
->max_channel
)) ||
1681 ((id
!= SCAN_WILD_CARD
) && (id
>= shost
->max_id
)) ||
1682 ((lun
!= SCAN_WILD_CARD
) && (lun
> shost
->max_lun
)))
1685 mutex_lock(&shost
->scan_mutex
);
1686 if (!shost
->async_scan
)
1687 scsi_complete_async_scans();
1689 if (scsi_host_scan_allowed(shost
)) {
1690 if (channel
== SCAN_WILD_CARD
)
1691 for (channel
= 0; channel
<= shost
->max_channel
;
1693 scsi_scan_channel(shost
, channel
, id
, lun
,
1696 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1698 mutex_unlock(&shost
->scan_mutex
);
1703 static void scsi_sysfs_add_devices(struct Scsi_Host
*shost
)
1705 struct scsi_device
*sdev
;
1706 shost_for_each_device(sdev
, shost
) {
1707 if (!scsi_host_scan_allowed(shost
) ||
1708 scsi_sysfs_add_sdev(sdev
) != 0)
1709 __scsi_remove_device(sdev
);
1714 * scsi_prep_async_scan - prepare for an async scan
1715 * @shost: the host which will be scanned
1716 * Returns: a cookie to be passed to scsi_finish_async_scan()
1718 * Tells the midlayer this host is going to do an asynchronous scan.
1719 * It reserves the host's position in the scanning list and ensures
1720 * that other asynchronous scans started after this one won't affect the
1721 * ordering of the discovered devices.
1723 static struct async_scan_data
*scsi_prep_async_scan(struct Scsi_Host
*shost
)
1725 struct async_scan_data
*data
;
1726 unsigned long flags
;
1728 if (strncmp(scsi_scan_type
, "sync", 4) == 0)
1731 if (shost
->async_scan
) {
1732 printk("%s called twice for host %d", __func__
,
1738 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
1741 data
->shost
= scsi_host_get(shost
);
1744 init_completion(&data
->prev_finished
);
1746 mutex_lock(&shost
->scan_mutex
);
1747 spin_lock_irqsave(shost
->host_lock
, flags
);
1748 shost
->async_scan
= 1;
1749 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1750 mutex_unlock(&shost
->scan_mutex
);
1752 spin_lock(&async_scan_lock
);
1753 if (list_empty(&scanning_hosts
))
1754 complete(&data
->prev_finished
);
1755 list_add_tail(&data
->list
, &scanning_hosts
);
1756 spin_unlock(&async_scan_lock
);
1766 * scsi_finish_async_scan - asynchronous scan has finished
1767 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1769 * All the devices currently attached to this host have been found.
1770 * This function announces all the devices it has found to the rest
1773 static void scsi_finish_async_scan(struct async_scan_data
*data
)
1775 struct Scsi_Host
*shost
;
1776 unsigned long flags
;
1781 shost
= data
->shost
;
1783 mutex_lock(&shost
->scan_mutex
);
1785 if (!shost
->async_scan
) {
1786 printk("%s called twice for host %d", __func__
,
1789 mutex_unlock(&shost
->scan_mutex
);
1793 wait_for_completion(&data
->prev_finished
);
1795 scsi_sysfs_add_devices(shost
);
1797 spin_lock_irqsave(shost
->host_lock
, flags
);
1798 shost
->async_scan
= 0;
1799 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1801 mutex_unlock(&shost
->scan_mutex
);
1803 spin_lock(&async_scan_lock
);
1804 list_del(&data
->list
);
1805 if (!list_empty(&scanning_hosts
)) {
1806 struct async_scan_data
*next
= list_entry(scanning_hosts
.next
,
1807 struct async_scan_data
, list
);
1808 complete(&next
->prev_finished
);
1810 spin_unlock(&async_scan_lock
);
1812 scsi_host_put(shost
);
1816 static void do_scsi_scan_host(struct Scsi_Host
*shost
)
1818 if (shost
->hostt
->scan_finished
) {
1819 unsigned long start
= jiffies
;
1820 if (shost
->hostt
->scan_start
)
1821 shost
->hostt
->scan_start(shost
);
1823 while (!shost
->hostt
->scan_finished(shost
, jiffies
- start
))
1826 scsi_scan_host_selected(shost
, SCAN_WILD_CARD
, SCAN_WILD_CARD
,
1831 static int do_scan_async(void *_data
)
1833 struct async_scan_data
*data
= _data
;
1834 do_scsi_scan_host(data
->shost
);
1835 scsi_finish_async_scan(data
);
1840 * scsi_scan_host - scan the given adapter
1841 * @shost: adapter to scan
1843 void scsi_scan_host(struct Scsi_Host
*shost
)
1845 struct task_struct
*p
;
1846 struct async_scan_data
*data
;
1848 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1851 data
= scsi_prep_async_scan(shost
);
1853 do_scsi_scan_host(shost
);
1857 p
= kthread_run(do_scan_async
, data
, "scsi_scan_%d", shost
->host_no
);
1859 do_scan_async(data
);
1861 EXPORT_SYMBOL(scsi_scan_host
);
1863 void scsi_forget_host(struct Scsi_Host
*shost
)
1865 struct scsi_device
*sdev
;
1866 unsigned long flags
;
1869 spin_lock_irqsave(shost
->host_lock
, flags
);
1870 list_for_each_entry(sdev
, &shost
->__devices
, siblings
) {
1871 if (sdev
->sdev_state
== SDEV_DEL
)
1873 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1874 __scsi_remove_device(sdev
);
1877 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1881 * Function: scsi_get_host_dev()
1883 * Purpose: Create a scsi_device that points to the host adapter itself.
1885 * Arguments: SHpnt - Host that needs a scsi_device
1887 * Lock status: None assumed.
1889 * Returns: The scsi_device or NULL
1892 * Attach a single scsi_device to the Scsi_Host - this should
1893 * be made to look like a "pseudo-device" that points to the
1896 * Note - this device is not accessible from any high-level
1897 * drivers (including generics), which is probably not
1898 * optimal. We can add hooks later to attach
1900 struct scsi_device
*scsi_get_host_dev(struct Scsi_Host
*shost
)
1902 struct scsi_device
*sdev
= NULL
;
1903 struct scsi_target
*starget
;
1905 mutex_lock(&shost
->scan_mutex
);
1906 if (!scsi_host_scan_allowed(shost
))
1908 starget
= scsi_alloc_target(&shost
->shost_gendev
, 0, shost
->this_id
);
1912 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1916 scsi_target_reap(starget
);
1917 put_device(&starget
->dev
);
1919 mutex_unlock(&shost
->scan_mutex
);
1922 EXPORT_SYMBOL(scsi_get_host_dev
);
1925 * Function: scsi_free_host_dev()
1927 * Purpose: Free a scsi_device that points to the host adapter itself.
1929 * Arguments: SHpnt - Host that needs a scsi_device
1931 * Lock status: None assumed.
1937 void scsi_free_host_dev(struct scsi_device
*sdev
)
1939 BUG_ON(sdev
->id
!= sdev
->host
->this_id
);
1941 __scsi_remove_device(sdev
);
1943 EXPORT_SYMBOL(scsi_free_host_dev
);