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
);
188 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
189 * @sdev: scsi device to send command to
190 * @result: area to store the result of the MODE SENSE
193 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
194 * Called for BLIST_KEY devices.
196 static void scsi_unlock_floptical(struct scsi_device
*sdev
,
197 unsigned char *result
)
199 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
201 printk(KERN_NOTICE
"scsi: unlocking floptical drive\n");
202 scsi_cmd
[0] = MODE_SENSE
;
206 scsi_cmd
[4] = 0x2a; /* size */
208 scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
, result
, 0x2a, NULL
,
209 SCSI_TIMEOUT
, 3, NULL
);
213 * scsi_alloc_sdev - allocate and setup a scsi_Device
214 * @starget: which target to allocate a &scsi_device for
216 * @hostdata: usually NULL and set by ->slave_alloc instead
219 * Allocate, initialize for io, and return a pointer to a scsi_Device.
220 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
221 * adds scsi_Device to the appropriate list.
224 * scsi_Device pointer, or NULL on failure.
226 static struct scsi_device
*scsi_alloc_sdev(struct scsi_target
*starget
,
227 unsigned int lun
, void *hostdata
)
229 struct scsi_device
*sdev
;
230 int display_failure_msg
= 1, ret
;
231 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
232 extern void scsi_evt_thread(struct work_struct
*work
);
233 extern void scsi_requeue_run_queue(struct work_struct
*work
);
235 sdev
= kzalloc(sizeof(*sdev
) + shost
->transportt
->device_size
,
240 sdev
->vendor
= scsi_null_device_strs
;
241 sdev
->model
= scsi_null_device_strs
;
242 sdev
->rev
= scsi_null_device_strs
;
244 sdev
->queue_ramp_up_period
= SCSI_DEFAULT_RAMP_UP_PERIOD
;
245 sdev
->id
= starget
->id
;
247 sdev
->channel
= starget
->channel
;
248 sdev
->sdev_state
= SDEV_CREATED
;
249 INIT_LIST_HEAD(&sdev
->siblings
);
250 INIT_LIST_HEAD(&sdev
->same_target_siblings
);
251 INIT_LIST_HEAD(&sdev
->cmd_list
);
252 INIT_LIST_HEAD(&sdev
->starved_entry
);
253 INIT_LIST_HEAD(&sdev
->event_list
);
254 spin_lock_init(&sdev
->list_lock
);
255 INIT_WORK(&sdev
->event_work
, scsi_evt_thread
);
256 INIT_WORK(&sdev
->requeue_work
, scsi_requeue_run_queue
);
258 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
259 sdev
->sdev_target
= starget
;
261 /* usually NULL and set by ->slave_alloc instead */
262 sdev
->hostdata
= hostdata
;
264 /* if the device needs this changing, it may do so in the
265 * slave_configure function */
266 sdev
->max_device_blocked
= SCSI_DEFAULT_DEVICE_BLOCKED
;
269 * Some low level driver could use device->type
274 * Assume that the device will have handshaking problems,
275 * and then fix this field later if it turns out it
280 sdev
->request_queue
= scsi_alloc_queue(sdev
);
281 if (!sdev
->request_queue
) {
282 /* release fn is set up in scsi_sysfs_device_initialise, so
283 * have to free and put manually here */
284 put_device(&starget
->dev
);
288 WARN_ON_ONCE(!blk_get_queue(sdev
->request_queue
));
289 sdev
->request_queue
->queuedata
= sdev
;
290 scsi_adjust_queue_depth(sdev
, 0, sdev
->host
->cmd_per_lun
);
292 scsi_sysfs_device_initialize(sdev
);
294 if (shost
->hostt
->slave_alloc
) {
295 ret
= shost
->hostt
->slave_alloc(sdev
);
298 * if LLDD reports slave not present, don't clutter
299 * console with alloc failure messages
302 display_failure_msg
= 0;
303 goto out_device_destroy
;
310 __scsi_remove_device(sdev
);
312 if (display_failure_msg
)
313 printk(ALLOC_FAILURE_MSG
, __func__
);
317 static void scsi_target_destroy(struct scsi_target
*starget
)
319 struct device
*dev
= &starget
->dev
;
320 struct Scsi_Host
*shost
= dev_to_shost(dev
->parent
);
323 starget
->state
= STARGET_DEL
;
324 transport_destroy_device(dev
);
325 spin_lock_irqsave(shost
->host_lock
, flags
);
326 if (shost
->hostt
->target_destroy
)
327 shost
->hostt
->target_destroy(starget
);
328 list_del_init(&starget
->siblings
);
329 spin_unlock_irqrestore(shost
->host_lock
, flags
);
333 static void scsi_target_dev_release(struct device
*dev
)
335 struct device
*parent
= dev
->parent
;
336 struct scsi_target
*starget
= to_scsi_target(dev
);
342 static struct device_type scsi_target_type
= {
343 .name
= "scsi_target",
344 .release
= scsi_target_dev_release
,
347 int scsi_is_target_device(const struct device
*dev
)
349 return dev
->type
== &scsi_target_type
;
351 EXPORT_SYMBOL(scsi_is_target_device
);
353 static struct scsi_target
*__scsi_find_target(struct device
*parent
,
354 int channel
, uint id
)
356 struct scsi_target
*starget
, *found_starget
= NULL
;
357 struct Scsi_Host
*shost
= dev_to_shost(parent
);
359 * Search for an existing target for this sdev.
361 list_for_each_entry(starget
, &shost
->__targets
, siblings
) {
362 if (starget
->id
== id
&&
363 starget
->channel
== channel
) {
364 found_starget
= starget
;
369 get_device(&found_starget
->dev
);
371 return found_starget
;
375 * scsi_target_reap_ref_release - remove target from visibility
376 * @kref: the reap_ref in the target being released
378 * Called on last put of reap_ref, which is the indication that no device
379 * under this target is visible anymore, so render the target invisible in
380 * sysfs. Note: we have to be in user context here because the target reaps
381 * should be done in places where the scsi device visibility is being removed.
383 static void scsi_target_reap_ref_release(struct kref
*kref
)
385 struct scsi_target
*starget
386 = container_of(kref
, struct scsi_target
, reap_ref
);
389 * if we get here and the target is still in the CREATED state that
390 * means it was allocated but never made visible (because a scan
391 * turned up no LUNs), so don't call device_del() on it.
393 if (starget
->state
!= STARGET_CREATED
) {
394 transport_remove_device(&starget
->dev
);
395 device_del(&starget
->dev
);
397 scsi_target_destroy(starget
);
400 static void scsi_target_reap_ref_put(struct scsi_target
*starget
)
402 kref_put(&starget
->reap_ref
, scsi_target_reap_ref_release
);
406 * scsi_alloc_target - allocate a new or find an existing target
407 * @parent: parent of the target (need not be a scsi host)
408 * @channel: target channel number (zero if no channels)
409 * @id: target id number
411 * Return an existing target if one exists, provided it hasn't already
412 * gone into STARGET_DEL state, otherwise allocate a new target.
414 * The target is returned with an incremented reference, so the caller
415 * is responsible for both reaping and doing a last put
417 static struct scsi_target
*scsi_alloc_target(struct device
*parent
,
418 int channel
, uint id
)
420 struct Scsi_Host
*shost
= dev_to_shost(parent
);
421 struct device
*dev
= NULL
;
423 const int size
= sizeof(struct scsi_target
)
424 + shost
->transportt
->target_size
;
425 struct scsi_target
*starget
;
426 struct scsi_target
*found_target
;
429 starget
= kzalloc(size
, GFP_KERNEL
);
431 printk(KERN_ERR
"%s: allocation failure\n", __func__
);
435 device_initialize(dev
);
436 kref_init(&starget
->reap_ref
);
437 dev
->parent
= get_device(parent
);
438 dev_set_name(dev
, "target%d:%d:%d", shost
->host_no
, channel
, id
);
439 dev
->bus
= &scsi_bus_type
;
440 dev
->type
= &scsi_target_type
;
442 starget
->channel
= channel
;
443 starget
->can_queue
= 0;
444 INIT_LIST_HEAD(&starget
->siblings
);
445 INIT_LIST_HEAD(&starget
->devices
);
446 starget
->state
= STARGET_CREATED
;
447 starget
->scsi_level
= SCSI_2
;
448 starget
->max_target_blocked
= SCSI_DEFAULT_TARGET_BLOCKED
;
450 spin_lock_irqsave(shost
->host_lock
, flags
);
452 found_target
= __scsi_find_target(parent
, channel
, id
);
456 list_add_tail(&starget
->siblings
, &shost
->__targets
);
457 spin_unlock_irqrestore(shost
->host_lock
, flags
);
458 /* allocate and add */
459 transport_setup_device(dev
);
460 if (shost
->hostt
->target_alloc
) {
461 error
= shost
->hostt
->target_alloc(starget
);
464 dev_printk(KERN_ERR
, dev
, "target allocation failed, error %d\n", error
);
465 /* don't want scsi_target_reap to do the final
466 * put because it will be under the host lock */
467 scsi_target_destroy(starget
);
477 * release routine already fired if kref is zero, so if we can still
478 * take the reference, the target must be alive. If we can't, it must
479 * be dying and we need to wait for a new target
481 ref_got
= kref_get_unless_zero(&found_target
->reap_ref
);
483 spin_unlock_irqrestore(shost
->host_lock
, flags
);
489 * Unfortunately, we found a dying target; need to wait until it's
490 * dead before we can get a new one. There is an anomaly here. We
491 * *should* call scsi_target_reap() to balance the kref_get() of the
492 * reap_ref above. However, since the target being released, it's
493 * already invisible and the reap_ref is irrelevant. If we call
494 * scsi_target_reap() we might spuriously do another device_del() on
495 * an already invisible target.
497 put_device(&found_target
->dev
);
499 * length of time is irrelevant here, we just want to yield the CPU
500 * for a tick to avoid busy waiting for the target to die.
507 * scsi_target_reap - check to see if target is in use and destroy if not
508 * @starget: target to be checked
510 * This is used after removing a LUN or doing a last put of the target
511 * it checks atomically that nothing is using the target and removes
514 void scsi_target_reap(struct scsi_target
*starget
)
517 * serious problem if this triggers: STARGET_DEL is only set in the if
518 * the reap_ref drops to zero, so we're trying to do another final put
519 * on an already released kref
521 BUG_ON(starget
->state
== STARGET_DEL
);
522 scsi_target_reap_ref_put(starget
);
526 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
527 * @s: INQUIRY result string to sanitize
528 * @len: length of the string
531 * The SCSI spec says that INQUIRY vendor, product, and revision
532 * strings must consist entirely of graphic ASCII characters,
533 * padded on the right with spaces. Since not all devices obey
534 * this rule, we will replace non-graphic or non-ASCII characters
535 * with spaces. Exception: a NUL character is interpreted as a
536 * string terminator, so all the following characters are set to
539 static void sanitize_inquiry_string(unsigned char *s
, int len
)
543 for (; len
> 0; (--len
, ++s
)) {
546 if (terminated
|| *s
< 0x20 || *s
> 0x7e)
552 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
553 * @sdev: scsi_device to probe
554 * @inq_result: area to store the INQUIRY result
555 * @result_len: len of inq_result
556 * @bflags: store any bflags found here
559 * Probe the lun associated with @req using a standard SCSI INQUIRY;
561 * If the INQUIRY is successful, zero is returned and the
562 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
563 * are copied to the scsi_device any flags value is stored in *@bflags.
565 static int scsi_probe_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
566 int result_len
, int *bflags
)
568 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
569 int first_inquiry_len
, try_inquiry_len
, next_inquiry_len
;
570 int response_len
= 0;
571 int pass
, count
, result
;
572 struct scsi_sense_hdr sshdr
;
576 /* Perform up to 3 passes. The first pass uses a conservative
577 * transfer length of 36 unless sdev->inquiry_len specifies a
578 * different value. */
579 first_inquiry_len
= sdev
->inquiry_len
? sdev
->inquiry_len
: 36;
580 try_inquiry_len
= first_inquiry_len
;
584 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
585 "scsi scan: INQUIRY pass %d length %d\n",
586 pass
, try_inquiry_len
));
588 /* Each pass gets up to three chances to ignore Unit Attention */
589 for (count
= 0; count
< 3; ++count
) {
592 memset(scsi_cmd
, 0, 6);
593 scsi_cmd
[0] = INQUIRY
;
594 scsi_cmd
[4] = (unsigned char) try_inquiry_len
;
596 memset(inq_result
, 0, try_inquiry_len
);
598 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
599 inq_result
, try_inquiry_len
, &sshdr
,
600 HZ
/ 2 + HZ
* scsi_inq_timeout
, 3,
603 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: INQUIRY %s "
605 result
? "failed" : "successful", result
));
609 * not-ready to ready transition [asc/ascq=0x28/0x0]
610 * or power-on, reset [asc/ascq=0x29/0x0], continue.
611 * INQUIRY should not yield UNIT_ATTENTION
612 * but many buggy devices do so anyway.
614 if ((driver_byte(result
) & DRIVER_SENSE
) &&
615 scsi_sense_valid(&sshdr
)) {
616 if ((sshdr
.sense_key
== UNIT_ATTENTION
) &&
617 ((sshdr
.asc
== 0x28) ||
618 (sshdr
.asc
== 0x29)) &&
624 * if nothing was transferred, we try
625 * again. It's a workaround for some USB
628 if (resid
== try_inquiry_len
)
635 sanitize_inquiry_string(&inq_result
[8], 8);
636 sanitize_inquiry_string(&inq_result
[16], 16);
637 sanitize_inquiry_string(&inq_result
[32], 4);
639 response_len
= inq_result
[4] + 5;
640 if (response_len
> 255)
641 response_len
= first_inquiry_len
; /* sanity */
644 * Get any flags for this device.
646 * XXX add a bflags to scsi_device, and replace the
647 * corresponding bit fields in scsi_device, so bflags
648 * need not be passed as an argument.
650 *bflags
= scsi_get_device_flags(sdev
, &inq_result
[8],
653 /* When the first pass succeeds we gain information about
654 * what larger transfer lengths might work. */
656 if (BLIST_INQUIRY_36
& *bflags
)
657 next_inquiry_len
= 36;
658 else if (BLIST_INQUIRY_58
& *bflags
)
659 next_inquiry_len
= 58;
660 else if (sdev
->inquiry_len
)
661 next_inquiry_len
= sdev
->inquiry_len
;
663 next_inquiry_len
= response_len
;
665 /* If more data is available perform the second pass */
666 if (next_inquiry_len
> try_inquiry_len
) {
667 try_inquiry_len
= next_inquiry_len
;
673 } else if (pass
== 2) {
674 printk(KERN_INFO
"scsi scan: %d byte inquiry failed. "
675 "Consider BLIST_INQUIRY_36 for this device\n",
678 /* If this pass failed, the third pass goes back and transfers
679 * the same amount as we successfully got in the first pass. */
680 try_inquiry_len
= first_inquiry_len
;
685 /* If the last transfer attempt got an error, assume the
686 * peripheral doesn't exist or is dead. */
690 /* Don't report any more data than the device says is valid */
691 sdev
->inquiry_len
= min(try_inquiry_len
, response_len
);
694 * XXX Abort if the response length is less than 36? If less than
695 * 32, the lookup of the device flags (above) could be invalid,
696 * and it would be possible to take an incorrect action - we do
697 * not want to hang because of a short INQUIRY. On the flip side,
698 * if the device is spun down or becoming ready (and so it gives a
699 * short INQUIRY), an abort here prevents any further use of the
700 * device, including spin up.
702 * On the whole, the best approach seems to be to assume the first
703 * 36 bytes are valid no matter what the device says. That's
704 * better than copying < 36 bytes to the inquiry-result buffer
705 * and displaying garbage for the Vendor, Product, or Revision
708 if (sdev
->inquiry_len
< 36) {
709 printk(KERN_INFO
"scsi scan: INQUIRY result too short (%d),"
710 " using 36\n", sdev
->inquiry_len
);
711 sdev
->inquiry_len
= 36;
715 * Related to the above issue:
717 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
718 * and if not ready, sent a START_STOP to start (maybe spin up) and
719 * then send the INQUIRY again, since the INQUIRY can change after
720 * a device is initialized.
722 * Ideally, start a device if explicitly asked to do so. This
723 * assumes that a device is spun up on power on, spun down on
724 * request, and then spun up on request.
728 * The scanning code needs to know the scsi_level, even if no
729 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
730 * non-zero LUNs can be scanned.
732 sdev
->scsi_level
= inq_result
[2] & 0x07;
733 if (sdev
->scsi_level
>= 2 ||
734 (sdev
->scsi_level
== 1 && (inq_result
[3] & 0x0f) == 1))
736 sdev
->sdev_target
->scsi_level
= sdev
->scsi_level
;
742 * scsi_add_lun - allocate and fully initialze a scsi_device
743 * @sdev: holds information to be stored in the new scsi_device
744 * @inq_result: holds the result of a previous INQUIRY to the LUN
745 * @bflags: black/white list flag
746 * @async: 1 if this device is being scanned asynchronously
749 * Initialize the scsi_device @sdev. Optionally set fields based
750 * on values in *@bflags.
753 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
754 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
756 static int scsi_add_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
757 int *bflags
, int async
)
762 * XXX do not save the inquiry, since it can change underneath us,
763 * save just vendor/model/rev.
765 * Rather than save it and have an ioctl that retrieves the saved
766 * value, have an ioctl that executes the same INQUIRY code used
767 * in scsi_probe_lun, let user level programs doing INQUIRY
768 * scanning run at their own risk, or supply a user level program
769 * that can correctly scan.
773 * Copy at least 36 bytes of INQUIRY data, so that we don't
774 * dereference unallocated memory when accessing the Vendor,
775 * Product, and Revision strings. Badly behaved devices may set
776 * the INQUIRY Additional Length byte to a small value, indicating
777 * these strings are invalid, but often they contain plausible data
778 * nonetheless. It doesn't matter if the device sent < 36 bytes
779 * total, since scsi_probe_lun() initializes inq_result with 0s.
781 sdev
->inquiry
= kmemdup(inq_result
,
782 max_t(size_t, sdev
->inquiry_len
, 36),
784 if (sdev
->inquiry
== NULL
)
785 return SCSI_SCAN_NO_RESPONSE
;
787 sdev
->vendor
= (char *) (sdev
->inquiry
+ 8);
788 sdev
->model
= (char *) (sdev
->inquiry
+ 16);
789 sdev
->rev
= (char *) (sdev
->inquiry
+ 32);
791 if (strncmp(sdev
->vendor
, "ATA ", 8) == 0) {
793 * sata emulation layer device. This is a hack to work around
794 * the SATL power management specifications which state that
795 * when the SATL detects the device has gone into standby
796 * mode, it shall respond with NOT READY.
798 sdev
->allow_restart
= 1;
801 if (*bflags
& BLIST_ISROM
) {
802 sdev
->type
= TYPE_ROM
;
805 sdev
->type
= (inq_result
[0] & 0x1f);
806 sdev
->removable
= (inq_result
[1] & 0x80) >> 7;
809 switch (sdev
->type
) {
817 case TYPE_MEDIUM_CHANGER
:
829 printk(KERN_INFO
"scsi: unknown device type %d\n", sdev
->type
);
832 if (sdev
->type
== TYPE_RBC
|| sdev
->type
== TYPE_ROM
) {
833 /* RBC and MMC devices can return SCSI-3 compliance and yet
834 * still not support REPORT LUNS, so make them act as
835 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
836 * specifically set */
837 if ((*bflags
& BLIST_REPORTLUN2
) == 0)
838 *bflags
|= BLIST_NOREPORTLUN
;
842 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
843 * spec says: The device server is capable of supporting the
844 * specified peripheral device type on this logical unit. However,
845 * the physical device is not currently connected to this logical
848 * The above is vague, as it implies that we could treat 001 and
849 * 011 the same. Stay compatible with previous code, and create a
850 * scsi_device for a PQ of 1
852 * Don't set the device offline here; rather let the upper
853 * level drivers eval the PQ to decide whether they should
854 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
857 sdev
->inq_periph_qual
= (inq_result
[0] >> 5) & 7;
858 sdev
->lockable
= sdev
->removable
;
859 sdev
->soft_reset
= (inq_result
[7] & 1) && ((inq_result
[3] & 7) == 2);
861 if (sdev
->scsi_level
>= SCSI_3
||
862 (sdev
->inquiry_len
> 56 && inq_result
[56] & 0x04))
864 if (inq_result
[7] & 0x60)
866 if (inq_result
[7] & 0x10)
869 sdev_printk(KERN_NOTICE
, sdev
, "%s %.8s %.16s %.4s PQ: %d "
870 "ANSI: %d%s\n", scsi_device_type(sdev
->type
),
871 sdev
->vendor
, sdev
->model
, sdev
->rev
,
872 sdev
->inq_periph_qual
, inq_result
[2] & 0x07,
873 (inq_result
[3] & 0x0f) == 1 ? " CCS" : "");
875 if ((sdev
->scsi_level
>= SCSI_2
) && (inq_result
[7] & 2) &&
876 !(*bflags
& BLIST_NOTQ
))
877 sdev
->tagged_supported
= 1;
880 * Some devices (Texel CD ROM drives) have handshaking problems
881 * when used with the Seagate controllers. borken is initialized
882 * to 1, and then set it to 0 here.
884 if ((*bflags
& BLIST_BORKEN
) == 0)
887 if (*bflags
& BLIST_NO_ULD_ATTACH
)
888 sdev
->no_uld_attach
= 1;
891 * Apparently some really broken devices (contrary to the SCSI
892 * standards) need to be selected without asserting ATN
894 if (*bflags
& BLIST_SELECT_NO_ATN
)
895 sdev
->select_no_atn
= 1;
898 * Maximum 512 sector transfer length
899 * broken RA4x00 Compaq Disk Array
901 if (*bflags
& BLIST_MAX_512
)
902 blk_queue_max_hw_sectors(sdev
->request_queue
, 512);
905 * Some devices may not want to have a start command automatically
906 * issued when a device is added.
908 if (*bflags
& BLIST_NOSTARTONADD
)
909 sdev
->no_start_on_add
= 1;
911 if (*bflags
& BLIST_SINGLELUN
)
912 scsi_target(sdev
)->single_lun
= 1;
914 sdev
->use_10_for_rw
= 1;
916 if (*bflags
& BLIST_MS_SKIP_PAGE_08
)
917 sdev
->skip_ms_page_8
= 1;
919 if (*bflags
& BLIST_MS_SKIP_PAGE_3F
)
920 sdev
->skip_ms_page_3f
= 1;
922 if (*bflags
& BLIST_USE_10_BYTE_MS
)
923 sdev
->use_10_for_ms
= 1;
925 /* set the device running here so that slave configure
927 ret
= scsi_device_set_state(sdev
, SDEV_RUNNING
);
929 ret
= scsi_device_set_state(sdev
, SDEV_BLOCK
);
932 sdev_printk(KERN_ERR
, sdev
,
933 "in wrong state %s to complete scan\n",
934 scsi_device_state_name(sdev
->sdev_state
));
935 return SCSI_SCAN_NO_RESPONSE
;
939 if (*bflags
& BLIST_MS_192_BYTES_FOR_3F
)
940 sdev
->use_192_bytes_for_3f
= 1;
942 if (*bflags
& BLIST_NOT_LOCKABLE
)
945 if (*bflags
& BLIST_RETRY_HWERROR
)
946 sdev
->retry_hwerror
= 1;
948 if (*bflags
& BLIST_NO_DIF
)
951 transport_configure_device(&sdev
->sdev_gendev
);
953 if (sdev
->host
->hostt
->slave_configure
) {
954 ret
= sdev
->host
->hostt
->slave_configure(sdev
);
957 * if LLDD reports slave not present, don't clutter
958 * console with alloc failure messages
961 sdev_printk(KERN_ERR
, sdev
,
962 "failed to configure device\n");
964 return SCSI_SCAN_NO_RESPONSE
;
968 sdev
->max_queue_depth
= sdev
->queue_depth
;
971 * Ok, the device is now all set up, we can
972 * register it and tell the rest of the kernel
975 if (!async
&& scsi_sysfs_add_sdev(sdev
) != 0)
976 return SCSI_SCAN_NO_RESPONSE
;
978 return SCSI_SCAN_LUN_PRESENT
;
981 #ifdef CONFIG_SCSI_LOGGING
983 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
984 * @buf: Output buffer with at least end-first+1 bytes of space
985 * @inq: Inquiry buffer (input)
986 * @first: Offset of string into inq
987 * @end: Index after last character in inq
989 static unsigned char *scsi_inq_str(unsigned char *buf
, unsigned char *inq
,
990 unsigned first
, unsigned end
)
992 unsigned term
= 0, idx
;
994 for (idx
= 0; idx
+ first
< end
&& idx
+ first
< inq
[4] + 5; idx
++) {
995 if (inq
[idx
+first
] > ' ') {
996 buf
[idx
] = inq
[idx
+first
];
1008 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1009 * @starget: pointer to target device structure
1010 * @lun: LUN of target device
1011 * @bflagsp: store bflags here if not NULL
1012 * @sdevp: probe the LUN corresponding to this scsi_device
1013 * @rescan: if nonzero skip some code only needed on first scan
1014 * @hostdata: passed to scsi_alloc_sdev()
1017 * Call scsi_probe_lun, if a LUN with an attached device is found,
1018 * allocate and set it up by calling scsi_add_lun.
1021 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
1022 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1023 * attached at the LUN
1024 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
1026 static int scsi_probe_and_add_lun(struct scsi_target
*starget
,
1027 uint lun
, int *bflagsp
,
1028 struct scsi_device
**sdevp
, int rescan
,
1031 struct scsi_device
*sdev
;
1032 unsigned char *result
;
1033 int bflags
, res
= SCSI_SCAN_NO_RESPONSE
, result_len
= 256;
1034 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1037 * The rescan flag is used as an optimization, the first scan of a
1038 * host adapter calls into here with rescan == 0.
1040 sdev
= scsi_device_lookup_by_target(starget
, lun
);
1042 if (rescan
|| !scsi_device_created(sdev
)) {
1043 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1044 "scsi scan: device exists on %s\n",
1045 dev_name(&sdev
->sdev_gendev
)));
1049 scsi_device_put(sdev
);
1052 *bflagsp
= scsi_get_device_flags(sdev
,
1055 return SCSI_SCAN_LUN_PRESENT
;
1057 scsi_device_put(sdev
);
1059 sdev
= scsi_alloc_sdev(starget
, lun
, hostdata
);
1063 result
= kmalloc(result_len
, GFP_ATOMIC
|
1064 ((shost
->unchecked_isa_dma
) ? __GFP_DMA
: 0));
1068 if (scsi_probe_lun(sdev
, result
, result_len
, &bflags
))
1069 goto out_free_result
;
1074 * result contains valid SCSI INQUIRY data.
1076 if (((result
[0] >> 5) == 3) && !(bflags
& BLIST_ATTACH_PQ3
)) {
1078 * For a Peripheral qualifier 3 (011b), the SCSI
1079 * spec says: The device server is not capable of
1080 * supporting a physical device on this logical
1083 * For disks, this implies that there is no
1084 * logical disk configured at sdev->lun, but there
1085 * is a target id responding.
1087 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO
, sdev
, "scsi scan:"
1088 " peripheral qualifier of 3, device not"
1091 SCSI_LOG_SCAN_BUS(1, {
1092 unsigned char vend
[9];
1093 unsigned char mod
[17];
1095 sdev_printk(KERN_INFO
, sdev
,
1096 "scsi scan: consider passing scsi_mod."
1097 "dev_flags=%s:%s:0x240 or 0x1000240\n",
1098 scsi_inq_str(vend
, result
, 8, 16),
1099 scsi_inq_str(mod
, result
, 16, 32));
1104 res
= SCSI_SCAN_TARGET_PRESENT
;
1105 goto out_free_result
;
1109 * Some targets may set slight variations of PQ and PDT to signal
1110 * that no LUN is present, so don't add sdev in these cases.
1111 * Two specific examples are:
1112 * 1) NetApp targets: return PQ=1, PDT=0x1f
1113 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1114 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1117 * 1) SCSI SPC-3, pp. 145-146
1118 * PQ=1: "A peripheral device having the specified peripheral
1119 * device type is not connected to this logical unit. However, the
1120 * device server is capable of supporting the specified peripheral
1121 * device type on this logical unit."
1122 * PDT=0x1f: "Unknown or no device type"
1123 * 2) USB UFI 1.0, p. 20
1124 * PDT=00h Direct-access device (floppy)
1125 * PDT=1Fh none (no FDD connected to the requested logical unit)
1127 if (((result
[0] >> 5) == 1 || starget
->pdt_1f_for_no_lun
) &&
1128 (result
[0] & 0x1f) == 0x1f &&
1129 !scsi_is_wlun(lun
)) {
1130 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1131 "scsi scan: peripheral device type"
1132 " of 31, no device added\n"));
1133 res
= SCSI_SCAN_TARGET_PRESENT
;
1134 goto out_free_result
;
1137 res
= scsi_add_lun(sdev
, result
, &bflags
, shost
->async_scan
);
1138 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1139 if (bflags
& BLIST_KEY
) {
1141 scsi_unlock_floptical(sdev
, result
);
1148 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1150 if (scsi_device_get(sdev
) == 0) {
1153 __scsi_remove_device(sdev
);
1154 res
= SCSI_SCAN_NO_RESPONSE
;
1158 __scsi_remove_device(sdev
);
1164 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1165 * @starget: pointer to target structure to scan
1166 * @bflags: black/white list flag for LUN 0
1167 * @scsi_level: Which version of the standard does this device adhere to
1168 * @rescan: passed to scsi_probe_add_lun()
1171 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1172 * scanned) to some maximum lun until a LUN is found with no device
1173 * attached. Use the bflags to figure out any oddities.
1175 * Modifies sdevscan->lun.
1177 static void scsi_sequential_lun_scan(struct scsi_target
*starget
,
1178 int bflags
, int scsi_level
, int rescan
)
1180 unsigned int sparse_lun
, lun
, max_dev_lun
;
1181 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1183 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: Sequential scan of"
1184 "%s\n", dev_name(&starget
->dev
)));
1186 max_dev_lun
= min(max_scsi_luns
, shost
->max_lun
);
1188 * If this device is known to support sparse multiple units,
1189 * override the other settings, and scan all of them. Normally,
1190 * SCSI-3 devices should be scanned via the REPORT LUNS.
1192 if (bflags
& BLIST_SPARSELUN
) {
1193 max_dev_lun
= shost
->max_lun
;
1199 * If less than SCSI_1_CSS, and no special lun scaning, stop
1200 * scanning; this matches 2.4 behaviour, but could just be a bug
1201 * (to continue scanning a SCSI_1_CSS device).
1203 * This test is broken. We might not have any device on lun0 for
1204 * a sparselun device, and if that's the case then how would we
1205 * know the real scsi_level, eh? It might make sense to just not
1206 * scan any SCSI_1 device for non-0 luns, but that check would best
1207 * go into scsi_alloc_sdev() and just have it return null when asked
1208 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1210 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1211 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1216 * If this device is known to support multiple units, override
1217 * the other settings, and scan all of them.
1219 if (bflags
& BLIST_FORCELUN
)
1220 max_dev_lun
= shost
->max_lun
;
1222 * REGAL CDC-4X: avoid hang after LUN 4
1224 if (bflags
& BLIST_MAX5LUN
)
1225 max_dev_lun
= min(5U, max_dev_lun
);
1227 * Do not scan SCSI-2 or lower device past LUN 7, unless
1230 if (scsi_level
< SCSI_3
&& !(bflags
& BLIST_LARGELUN
))
1231 max_dev_lun
= min(8U, max_dev_lun
);
1234 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1235 * until we reach the max, or no LUN is found and we are not
1238 for (lun
= 1; lun
< max_dev_lun
; ++lun
)
1239 if ((scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
,
1240 NULL
) != SCSI_SCAN_LUN_PRESENT
) &&
1246 * scsilun_to_int - convert a scsi_lun to an int
1247 * @scsilun: struct scsi_lun to be converted.
1250 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1251 * integer, and return the result. The caller must check for
1252 * truncation before using this function.
1255 * The struct scsi_lun is assumed to be four levels, with each level
1256 * effectively containing a SCSI byte-ordered (big endian) short; the
1257 * addressing bits of each level are ignored (the highest two bits).
1258 * For a description of the LUN format, post SCSI-3 see the SCSI
1259 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1261 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1262 * the integer: 0x0b030a04
1264 int scsilun_to_int(struct scsi_lun
*scsilun
)
1270 for (i
= 0; i
< sizeof(lun
); i
+= 2)
1271 lun
= lun
| (((scsilun
->scsi_lun
[i
] << 8) |
1272 scsilun
->scsi_lun
[i
+ 1]) << (i
* 8));
1275 EXPORT_SYMBOL(scsilun_to_int
);
1278 * int_to_scsilun - reverts an int into a scsi_lun
1279 * @lun: integer to be reverted
1280 * @scsilun: struct scsi_lun to be set.
1283 * Reverts the functionality of the scsilun_to_int, which packed
1284 * an 8-byte lun value into an int. This routine unpacks the int
1285 * back into the lun value.
1286 * Note: the scsilun_to_int() routine does not truly handle all
1287 * 8bytes of the lun value. This functions restores only as much
1288 * as was set by the routine.
1291 * Given an integer : 0x0b030a04, this function returns a
1292 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1295 void int_to_scsilun(unsigned int lun
, struct scsi_lun
*scsilun
)
1299 memset(scsilun
->scsi_lun
, 0, sizeof(scsilun
->scsi_lun
));
1301 for (i
= 0; i
< sizeof(lun
); i
+= 2) {
1302 scsilun
->scsi_lun
[i
] = (lun
>> 8) & 0xFF;
1303 scsilun
->scsi_lun
[i
+1] = lun
& 0xFF;
1307 EXPORT_SYMBOL(int_to_scsilun
);
1310 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1311 * @starget: which target
1312 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1313 * @rescan: nonzero if we can skip code only needed on first scan
1316 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1317 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
1319 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1320 * LUNs even if it's older than SCSI-3.
1321 * If BLIST_NOREPORTLUN is set, return 1 always.
1322 * If BLIST_NOLUN is set, return 0 always.
1323 * If starget->no_report_luns is set, return 1 always.
1326 * 0: scan completed (or no memory, so further scanning is futile)
1327 * 1: could not scan with REPORT LUN
1329 static int scsi_report_lun_scan(struct scsi_target
*starget
, int bflags
,
1333 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
1334 unsigned int length
;
1336 unsigned int num_luns
;
1337 unsigned int retries
;
1339 struct scsi_lun
*lunp
, *lun_data
;
1341 struct scsi_sense_hdr sshdr
;
1342 struct scsi_device
*sdev
;
1343 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
1347 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1348 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1349 * support more than 8 LUNs.
1350 * Don't attempt if the target doesn't support REPORT LUNS.
1352 if (bflags
& BLIST_NOREPORTLUN
)
1354 if (starget
->scsi_level
< SCSI_2
&&
1355 starget
->scsi_level
!= SCSI_UNKNOWN
)
1357 if (starget
->scsi_level
< SCSI_3
&&
1358 (!(bflags
& BLIST_REPORTLUN2
) || shost
->max_lun
<= 8))
1360 if (bflags
& BLIST_NOLUN
)
1362 if (starget
->no_report_luns
)
1365 if (!(sdev
= scsi_device_lookup_by_target(starget
, 0))) {
1366 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1369 if (scsi_device_get(sdev
)) {
1370 __scsi_remove_device(sdev
);
1375 sprintf(devname
, "host %d channel %d id %d",
1376 shost
->host_no
, sdev
->channel
, sdev
->id
);
1379 * Allocate enough to hold the header (the same size as one scsi_lun)
1380 * plus the max number of luns we are requesting.
1382 * Reallocating and trying again (with the exact amount we need)
1383 * would be nice, but then we need to somehow limit the size
1384 * allocated based on the available memory and the limits of
1385 * kmalloc - we don't want a kmalloc() failure of a huge value to
1386 * prevent us from finding any LUNs on this target.
1388 length
= (max_scsi_report_luns
+ 1) * sizeof(struct scsi_lun
);
1389 lun_data
= kmalloc(length
, GFP_ATOMIC
|
1390 (sdev
->host
->unchecked_isa_dma
? __GFP_DMA
: 0));
1392 printk(ALLOC_FAILURE_MSG
, __func__
);
1396 scsi_cmd
[0] = REPORT_LUNS
;
1399 * bytes 1 - 5: reserved, set to zero.
1401 memset(&scsi_cmd
[1], 0, 5);
1404 * bytes 6 - 9: length of the command.
1406 scsi_cmd
[6] = (unsigned char) (length
>> 24) & 0xff;
1407 scsi_cmd
[7] = (unsigned char) (length
>> 16) & 0xff;
1408 scsi_cmd
[8] = (unsigned char) (length
>> 8) & 0xff;
1409 scsi_cmd
[9] = (unsigned char) length
& 0xff;
1411 scsi_cmd
[10] = 0; /* reserved */
1412 scsi_cmd
[11] = 0; /* control */
1415 * We can get a UNIT ATTENTION, for example a power on/reset, so
1416 * retry a few times (like sd.c does for TEST UNIT READY).
1417 * Experience shows some combinations of adapter/devices get at
1418 * least two power on/resets.
1420 * Illegal requests (for devices that do not support REPORT LUNS)
1421 * should come through as a check condition, and will not generate
1424 for (retries
= 0; retries
< 3; retries
++) {
1425 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: Sending"
1426 " REPORT LUNS to %s (try %d)\n", devname
,
1429 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
1430 lun_data
, length
, &sshdr
,
1431 SCSI_TIMEOUT
+ 4 * HZ
, 3, NULL
);
1433 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: REPORT LUNS"
1434 " %s (try %d) result 0x%x\n", result
1435 ? "failed" : "successful", retries
, result
));
1438 else if (scsi_sense_valid(&sshdr
)) {
1439 if (sshdr
.sense_key
!= UNIT_ATTENTION
)
1446 * The device probably does not support a REPORT LUN command
1453 * Get the length from the first four bytes of lun_data.
1455 data
= (u8
*) lun_data
->scsi_lun
;
1456 length
= ((data
[0] << 24) | (data
[1] << 16) |
1457 (data
[2] << 8) | (data
[3] << 0));
1459 num_luns
= (length
/ sizeof(struct scsi_lun
));
1460 if (num_luns
> max_scsi_report_luns
) {
1461 printk(KERN_WARNING
"scsi: On %s only %d (max_scsi_report_luns)"
1462 " of %d luns reported, try increasing"
1463 " max_scsi_report_luns.\n", devname
,
1464 max_scsi_report_luns
, num_luns
);
1465 num_luns
= max_scsi_report_luns
;
1468 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1469 "scsi scan: REPORT LUN scan\n"));
1472 * Scan the luns in lun_data. The entry at offset 0 is really
1473 * the header, so start at 1 and go up to and including num_luns.
1475 for (lunp
= &lun_data
[1]; lunp
<= &lun_data
[num_luns
]; lunp
++) {
1476 lun
= scsilun_to_int(lunp
);
1479 * Check if the unused part of lunp is non-zero, and so
1480 * does not fit in lun.
1482 if (memcmp(&lunp
->scsi_lun
[sizeof(lun
)], "\0\0\0\0", 4)) {
1486 * Output an error displaying the LUN in byte order,
1487 * this differs from what linux would print for the
1488 * integer LUN value.
1490 printk(KERN_WARNING
"scsi: %s lun 0x", devname
);
1491 data
= (char *)lunp
->scsi_lun
;
1492 for (i
= 0; i
< sizeof(struct scsi_lun
); i
++)
1493 printk("%02x", data
[i
]);
1494 printk(" has a LUN larger than currently supported.\n");
1495 } else if (lun
> sdev
->host
->max_lun
) {
1496 printk(KERN_WARNING
"scsi: %s lun%d has a LUN larger"
1497 " than allowed by the host adapter\n",
1502 res
= scsi_probe_and_add_lun(starget
,
1503 lun
, NULL
, NULL
, rescan
, NULL
);
1504 if (res
== SCSI_SCAN_NO_RESPONSE
) {
1506 * Got some results, but now none, abort.
1508 sdev_printk(KERN_ERR
, sdev
,
1509 "Unexpected response"
1510 " from lun %d while scanning, scan"
1520 if (scsi_device_created(sdev
))
1522 * the sdev we used didn't appear in the report luns scan
1524 __scsi_remove_device(sdev
);
1525 scsi_device_put(sdev
);
1529 struct scsi_device
*__scsi_add_device(struct Scsi_Host
*shost
, uint channel
,
1530 uint id
, uint lun
, void *hostdata
)
1532 struct scsi_device
*sdev
= ERR_PTR(-ENODEV
);
1533 struct device
*parent
= &shost
->shost_gendev
;
1534 struct scsi_target
*starget
;
1536 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1537 return ERR_PTR(-ENODEV
);
1539 starget
= scsi_alloc_target(parent
, channel
, id
);
1541 return ERR_PTR(-ENOMEM
);
1542 scsi_autopm_get_target(starget
);
1544 mutex_lock(&shost
->scan_mutex
);
1545 if (!shost
->async_scan
)
1546 scsi_complete_async_scans();
1548 if (scsi_host_scan_allowed(shost
) && scsi_autopm_get_host(shost
) == 0) {
1549 scsi_probe_and_add_lun(starget
, lun
, NULL
, &sdev
, 1, hostdata
);
1550 scsi_autopm_put_host(shost
);
1552 mutex_unlock(&shost
->scan_mutex
);
1553 scsi_autopm_put_target(starget
);
1555 * paired with scsi_alloc_target(). Target will be destroyed unless
1556 * scsi_probe_and_add_lun made an underlying device visible
1558 scsi_target_reap(starget
);
1559 put_device(&starget
->dev
);
1563 EXPORT_SYMBOL(__scsi_add_device
);
1565 int scsi_add_device(struct Scsi_Host
*host
, uint channel
,
1566 uint target
, uint lun
)
1568 struct scsi_device
*sdev
=
1569 __scsi_add_device(host
, channel
, target
, lun
, NULL
);
1571 return PTR_ERR(sdev
);
1573 scsi_device_put(sdev
);
1576 EXPORT_SYMBOL(scsi_add_device
);
1578 void scsi_rescan_device(struct device
*dev
)
1580 struct scsi_driver
*drv
;
1585 drv
= to_scsi_driver(dev
->driver
);
1586 if (try_module_get(drv
->owner
)) {
1589 module_put(drv
->owner
);
1592 EXPORT_SYMBOL(scsi_rescan_device
);
1594 static void __scsi_scan_target(struct device
*parent
, unsigned int channel
,
1595 unsigned int id
, unsigned int lun
, int rescan
)
1597 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1600 struct scsi_target
*starget
;
1602 if (shost
->this_id
== id
)
1604 * Don't scan the host adapter
1608 starget
= scsi_alloc_target(parent
, channel
, id
);
1611 scsi_autopm_get_target(starget
);
1613 if (lun
!= SCAN_WILD_CARD
) {
1615 * Scan for a specific host/chan/id/lun.
1617 scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
, NULL
);
1622 * Scan LUN 0, if there is some response, scan further. Ideally, we
1623 * would not configure LUN 0 until all LUNs are scanned.
1625 res
= scsi_probe_and_add_lun(starget
, 0, &bflags
, NULL
, rescan
, NULL
);
1626 if (res
== SCSI_SCAN_LUN_PRESENT
|| res
== SCSI_SCAN_TARGET_PRESENT
) {
1627 if (scsi_report_lun_scan(starget
, bflags
, rescan
) != 0)
1629 * The REPORT LUN did not scan the target,
1630 * do a sequential scan.
1632 scsi_sequential_lun_scan(starget
, bflags
,
1633 starget
->scsi_level
, rescan
);
1637 scsi_autopm_put_target(starget
);
1639 * paired with scsi_alloc_target(): determine if the target has
1640 * any children at all and if not, nuke it
1642 scsi_target_reap(starget
);
1644 put_device(&starget
->dev
);
1648 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1649 * @parent: host to scan
1650 * @channel: channel to scan
1651 * @id: target id to scan
1652 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1653 * @rescan: passed to LUN scanning routines
1656 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1657 * and possibly all LUNs on the target id.
1659 * First try a REPORT LUN scan, if that does not scan the target, do a
1660 * sequential scan of LUNs on the target id.
1662 void scsi_scan_target(struct device
*parent
, unsigned int channel
,
1663 unsigned int id
, unsigned int lun
, int rescan
)
1665 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1667 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1670 mutex_lock(&shost
->scan_mutex
);
1671 if (!shost
->async_scan
)
1672 scsi_complete_async_scans();
1674 if (scsi_host_scan_allowed(shost
) && scsi_autopm_get_host(shost
) == 0) {
1675 __scsi_scan_target(parent
, channel
, id
, lun
, rescan
);
1676 scsi_autopm_put_host(shost
);
1678 mutex_unlock(&shost
->scan_mutex
);
1680 EXPORT_SYMBOL(scsi_scan_target
);
1682 static void scsi_scan_channel(struct Scsi_Host
*shost
, unsigned int channel
,
1683 unsigned int id
, unsigned int lun
, int rescan
)
1687 if (id
== SCAN_WILD_CARD
)
1688 for (id
= 0; id
< shost
->max_id
; ++id
) {
1690 * XXX adapter drivers when possible (FCP, iSCSI)
1691 * could modify max_id to match the current max,
1692 * not the absolute max.
1694 * XXX add a shost id iterator, so for example,
1695 * the FC ID can be the same as a target id
1696 * without a huge overhead of sparse id's.
1698 if (shost
->reverse_ordering
)
1700 * Scan from high to low id.
1702 order_id
= shost
->max_id
- id
- 1;
1705 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1706 order_id
, lun
, rescan
);
1709 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1713 int scsi_scan_host_selected(struct Scsi_Host
*shost
, unsigned int channel
,
1714 unsigned int id
, unsigned int lun
, int rescan
)
1716 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO
, shost
,
1718 __func__
, channel
, id
, lun
));
1720 if (((channel
!= SCAN_WILD_CARD
) && (channel
> shost
->max_channel
)) ||
1721 ((id
!= SCAN_WILD_CARD
) && (id
>= shost
->max_id
)) ||
1722 ((lun
!= SCAN_WILD_CARD
) && (lun
> shost
->max_lun
)))
1725 mutex_lock(&shost
->scan_mutex
);
1726 if (!shost
->async_scan
)
1727 scsi_complete_async_scans();
1729 if (scsi_host_scan_allowed(shost
) && scsi_autopm_get_host(shost
) == 0) {
1730 if (channel
== SCAN_WILD_CARD
)
1731 for (channel
= 0; channel
<= shost
->max_channel
;
1733 scsi_scan_channel(shost
, channel
, id
, lun
,
1736 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1737 scsi_autopm_put_host(shost
);
1739 mutex_unlock(&shost
->scan_mutex
);
1744 static void scsi_sysfs_add_devices(struct Scsi_Host
*shost
)
1746 struct scsi_device
*sdev
;
1747 shost_for_each_device(sdev
, shost
) {
1748 /* target removed before the device could be added */
1749 if (sdev
->sdev_state
== SDEV_DEL
)
1751 if (!scsi_host_scan_allowed(shost
) ||
1752 scsi_sysfs_add_sdev(sdev
) != 0)
1753 __scsi_remove_device(sdev
);
1758 * scsi_prep_async_scan - prepare for an async scan
1759 * @shost: the host which will be scanned
1760 * Returns: a cookie to be passed to scsi_finish_async_scan()
1762 * Tells the midlayer this host is going to do an asynchronous scan.
1763 * It reserves the host's position in the scanning list and ensures
1764 * that other asynchronous scans started after this one won't affect the
1765 * ordering of the discovered devices.
1767 static struct async_scan_data
*scsi_prep_async_scan(struct Scsi_Host
*shost
)
1769 struct async_scan_data
*data
;
1770 unsigned long flags
;
1772 if (strncmp(scsi_scan_type
, "sync", 4) == 0)
1775 if (shost
->async_scan
) {
1776 printk("%s called twice for host %d", __func__
,
1782 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
1785 data
->shost
= scsi_host_get(shost
);
1788 init_completion(&data
->prev_finished
);
1790 mutex_lock(&shost
->scan_mutex
);
1791 spin_lock_irqsave(shost
->host_lock
, flags
);
1792 shost
->async_scan
= 1;
1793 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1794 mutex_unlock(&shost
->scan_mutex
);
1796 spin_lock(&async_scan_lock
);
1797 if (list_empty(&scanning_hosts
))
1798 complete(&data
->prev_finished
);
1799 list_add_tail(&data
->list
, &scanning_hosts
);
1800 spin_unlock(&async_scan_lock
);
1810 * scsi_finish_async_scan - asynchronous scan has finished
1811 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1813 * All the devices currently attached to this host have been found.
1814 * This function announces all the devices it has found to the rest
1817 static void scsi_finish_async_scan(struct async_scan_data
*data
)
1819 struct Scsi_Host
*shost
;
1820 unsigned long flags
;
1825 shost
= data
->shost
;
1827 mutex_lock(&shost
->scan_mutex
);
1829 if (!shost
->async_scan
) {
1830 printk("%s called twice for host %d", __func__
,
1833 mutex_unlock(&shost
->scan_mutex
);
1837 wait_for_completion(&data
->prev_finished
);
1839 scsi_sysfs_add_devices(shost
);
1841 spin_lock_irqsave(shost
->host_lock
, flags
);
1842 shost
->async_scan
= 0;
1843 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1845 mutex_unlock(&shost
->scan_mutex
);
1847 spin_lock(&async_scan_lock
);
1848 list_del(&data
->list
);
1849 if (!list_empty(&scanning_hosts
)) {
1850 struct async_scan_data
*next
= list_entry(scanning_hosts
.next
,
1851 struct async_scan_data
, list
);
1852 complete(&next
->prev_finished
);
1854 spin_unlock(&async_scan_lock
);
1856 scsi_autopm_put_host(shost
);
1857 scsi_host_put(shost
);
1861 static void do_scsi_scan_host(struct Scsi_Host
*shost
)
1863 if (shost
->hostt
->scan_finished
) {
1864 unsigned long start
= jiffies
;
1865 if (shost
->hostt
->scan_start
)
1866 shost
->hostt
->scan_start(shost
);
1868 while (!shost
->hostt
->scan_finished(shost
, jiffies
- start
))
1871 scsi_scan_host_selected(shost
, SCAN_WILD_CARD
, SCAN_WILD_CARD
,
1876 static void do_scan_async(void *_data
, async_cookie_t c
)
1878 struct async_scan_data
*data
= _data
;
1879 struct Scsi_Host
*shost
= data
->shost
;
1881 do_scsi_scan_host(shost
);
1882 scsi_finish_async_scan(data
);
1886 * scsi_scan_host - scan the given adapter
1887 * @shost: adapter to scan
1889 void scsi_scan_host(struct Scsi_Host
*shost
)
1891 struct async_scan_data
*data
;
1893 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1895 if (scsi_autopm_get_host(shost
) < 0)
1898 data
= scsi_prep_async_scan(shost
);
1900 do_scsi_scan_host(shost
);
1901 scsi_autopm_put_host(shost
);
1905 /* register with the async subsystem so wait_for_device_probe()
1906 * will flush this work
1908 async_schedule(do_scan_async
, data
);
1910 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
1912 EXPORT_SYMBOL(scsi_scan_host
);
1914 void scsi_forget_host(struct Scsi_Host
*shost
)
1916 struct scsi_device
*sdev
;
1917 unsigned long flags
;
1920 spin_lock_irqsave(shost
->host_lock
, flags
);
1921 list_for_each_entry(sdev
, &shost
->__devices
, siblings
) {
1922 if (sdev
->sdev_state
== SDEV_DEL
)
1924 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1925 __scsi_remove_device(sdev
);
1928 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1932 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1933 * @shost: Host that needs a scsi_device
1935 * Lock status: None assumed.
1937 * Returns: The scsi_device or NULL
1940 * Attach a single scsi_device to the Scsi_Host - this should
1941 * be made to look like a "pseudo-device" that points to the
1944 * Note - this device is not accessible from any high-level
1945 * drivers (including generics), which is probably not
1946 * optimal. We can add hooks later to attach.
1948 struct scsi_device
*scsi_get_host_dev(struct Scsi_Host
*shost
)
1950 struct scsi_device
*sdev
= NULL
;
1951 struct scsi_target
*starget
;
1953 mutex_lock(&shost
->scan_mutex
);
1954 if (!scsi_host_scan_allowed(shost
))
1956 starget
= scsi_alloc_target(&shost
->shost_gendev
, 0, shost
->this_id
);
1960 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1964 scsi_target_reap(starget
);
1965 put_device(&starget
->dev
);
1967 mutex_unlock(&shost
->scan_mutex
);
1970 EXPORT_SYMBOL(scsi_get_host_dev
);
1973 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1974 * @sdev: Host device to be freed
1976 * Lock status: None assumed.
1980 void scsi_free_host_dev(struct scsi_device
*sdev
)
1982 BUG_ON(sdev
->id
!= sdev
->host
->this_id
);
1984 __scsi_remove_device(sdev
);
1986 EXPORT_SYMBOL(scsi_free_host_dev
);