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>
36 #include <scsi/scsi.h>
37 #include <scsi/scsi_cmnd.h>
38 #include <scsi/scsi_device.h>
39 #include <scsi/scsi_driver.h>
40 #include <scsi/scsi_devinfo.h>
41 #include <scsi/scsi_host.h>
42 #include <scsi/scsi_transport.h>
43 #include <scsi/scsi_eh.h>
45 #include "scsi_priv.h"
46 #include "scsi_logging.h"
48 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
49 " SCSI scanning, some SCSI devices might not be configured\n"
54 #define SCSI_TIMEOUT (2*HZ)
57 * Prefix values for the SCSI id's (stored in sysfs name field)
59 #define SCSI_UID_SER_NUM 'S'
60 #define SCSI_UID_UNKNOWN 'Z'
63 * Return values of some of the scanning functions.
65 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
66 * includes allocation or general failures preventing IO from being sent.
68 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
71 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
74 #define SCSI_SCAN_NO_RESPONSE 0
75 #define SCSI_SCAN_TARGET_PRESENT 1
76 #define SCSI_SCAN_LUN_PRESENT 2
78 static const char *scsi_null_device_strs
= "nullnullnullnull";
80 #define MAX_SCSI_LUNS 512
82 #ifdef CONFIG_SCSI_MULTI_LUN
83 static unsigned int max_scsi_luns
= MAX_SCSI_LUNS
;
85 static unsigned int max_scsi_luns
= 1;
88 module_param_named(max_luns
, max_scsi_luns
, uint
, S_IRUGO
|S_IWUSR
);
89 MODULE_PARM_DESC(max_luns
,
90 "last scsi LUN (should be between 1 and 2^32-1)");
92 #ifdef CONFIG_SCSI_SCAN_ASYNC
93 #define SCSI_SCAN_TYPE_DEFAULT "async"
95 #define SCSI_SCAN_TYPE_DEFAULT "sync"
98 static char scsi_scan_type
[6] = SCSI_SCAN_TYPE_DEFAULT
;
100 module_param_string(scan
, scsi_scan_type
, sizeof(scsi_scan_type
), S_IRUGO
);
101 MODULE_PARM_DESC(scan
, "sync, async or none");
104 * max_scsi_report_luns: the maximum number of LUNS that will be
105 * returned from the REPORT LUNS command. 8 times this value must
106 * be allocated. In theory this could be up to an 8 byte value, but
107 * in practice, the maximum number of LUNs suppored by any device
110 static unsigned int max_scsi_report_luns
= 511;
112 module_param_named(max_report_luns
, max_scsi_report_luns
, uint
, S_IRUGO
|S_IWUSR
);
113 MODULE_PARM_DESC(max_report_luns
,
114 "REPORT LUNS maximum number of LUNS received (should be"
115 " between 1 and 16384)");
117 static unsigned int scsi_inq_timeout
= SCSI_TIMEOUT
/HZ
+3;
119 module_param_named(inq_timeout
, scsi_inq_timeout
, uint
, S_IRUGO
|S_IWUSR
);
120 MODULE_PARM_DESC(inq_timeout
,
121 "Timeout (in seconds) waiting for devices to answer INQUIRY."
122 " Default is 5. Some non-compliant devices need more.");
124 /* This lock protects only this list */
125 static DEFINE_SPINLOCK(async_scan_lock
);
126 static LIST_HEAD(scanning_hosts
);
128 struct async_scan_data
{
129 struct list_head list
;
130 struct Scsi_Host
*shost
;
131 struct completion prev_finished
;
135 * scsi_complete_async_scans - Wait for asynchronous scans to complete
137 * When this function returns, any host which started scanning before
138 * this function was called will have finished its scan. Hosts which
139 * started scanning after this function was called may or may not have
142 int scsi_complete_async_scans(void)
144 struct async_scan_data
*data
;
147 if (list_empty(&scanning_hosts
))
149 /* If we can't get memory immediately, that's OK. Just
150 * sleep a little. Even if we never get memory, the async
151 * scans will finish eventually.
153 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
159 init_completion(&data
->prev_finished
);
161 spin_lock(&async_scan_lock
);
162 /* Check that there's still somebody else on the list */
163 if (list_empty(&scanning_hosts
))
165 list_add_tail(&data
->list
, &scanning_hosts
);
166 spin_unlock(&async_scan_lock
);
168 printk(KERN_INFO
"scsi: waiting for bus probes to complete ...\n");
169 wait_for_completion(&data
->prev_finished
);
171 spin_lock(&async_scan_lock
);
172 list_del(&data
->list
);
173 if (!list_empty(&scanning_hosts
)) {
174 struct async_scan_data
*next
= list_entry(scanning_hosts
.next
,
175 struct async_scan_data
, list
);
176 complete(&next
->prev_finished
);
179 spin_unlock(&async_scan_lock
);
185 /* Only exported for the benefit of scsi_wait_scan */
186 EXPORT_SYMBOL_GPL(scsi_complete_async_scans
);
190 * For async scanning we need to wait for all the scans to complete before
191 * trying to mount the root fs. Otherwise non-modular drivers may not be ready
194 late_initcall(scsi_complete_async_scans
);
198 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
199 * @sdev: scsi device to send command to
200 * @result: area to store the result of the MODE SENSE
203 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
204 * Called for BLIST_KEY devices.
206 static void scsi_unlock_floptical(struct scsi_device
*sdev
,
207 unsigned char *result
)
209 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
211 printk(KERN_NOTICE
"scsi: unlocking floptical drive\n");
212 scsi_cmd
[0] = MODE_SENSE
;
216 scsi_cmd
[4] = 0x2a; /* size */
218 scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
, result
, 0x2a, NULL
,
223 * scsi_alloc_sdev - allocate and setup a scsi_Device
224 * @starget: which target to allocate a &scsi_device for
226 * @hostdata: usually NULL and set by ->slave_alloc instead
229 * Allocate, initialize for io, and return a pointer to a scsi_Device.
230 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
231 * adds scsi_Device to the appropriate list.
234 * scsi_Device pointer, or NULL on failure.
236 static struct scsi_device
*scsi_alloc_sdev(struct scsi_target
*starget
,
237 unsigned int lun
, void *hostdata
)
239 struct scsi_device
*sdev
;
240 int display_failure_msg
= 1, ret
;
241 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
242 extern void scsi_evt_thread(struct work_struct
*work
);
244 sdev
= kzalloc(sizeof(*sdev
) + shost
->transportt
->device_size
,
249 sdev
->vendor
= scsi_null_device_strs
;
250 sdev
->model
= scsi_null_device_strs
;
251 sdev
->rev
= scsi_null_device_strs
;
253 sdev
->id
= starget
->id
;
255 sdev
->channel
= starget
->channel
;
256 sdev
->sdev_state
= SDEV_CREATED
;
257 INIT_LIST_HEAD(&sdev
->siblings
);
258 INIT_LIST_HEAD(&sdev
->same_target_siblings
);
259 INIT_LIST_HEAD(&sdev
->cmd_list
);
260 INIT_LIST_HEAD(&sdev
->starved_entry
);
261 INIT_LIST_HEAD(&sdev
->event_list
);
262 spin_lock_init(&sdev
->list_lock
);
263 INIT_WORK(&sdev
->event_work
, scsi_evt_thread
);
265 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
266 sdev
->sdev_target
= starget
;
268 /* usually NULL and set by ->slave_alloc instead */
269 sdev
->hostdata
= hostdata
;
271 /* if the device needs this changing, it may do so in the
272 * slave_configure function */
273 sdev
->max_device_blocked
= SCSI_DEFAULT_DEVICE_BLOCKED
;
276 * Some low level driver could use device->type
281 * Assume that the device will have handshaking problems,
282 * and then fix this field later if it turns out it
287 sdev
->request_queue
= scsi_alloc_queue(sdev
);
288 if (!sdev
->request_queue
) {
289 /* release fn is set up in scsi_sysfs_device_initialise, so
290 * have to free and put manually here */
291 put_device(&starget
->dev
);
296 sdev
->request_queue
->queuedata
= sdev
;
297 scsi_adjust_queue_depth(sdev
, 0, sdev
->host
->cmd_per_lun
);
299 scsi_sysfs_device_initialize(sdev
);
301 if (shost
->hostt
->slave_alloc
) {
302 ret
= shost
->hostt
->slave_alloc(sdev
);
305 * if LLDD reports slave not present, don't clutter
306 * console with alloc failure messages
309 display_failure_msg
= 0;
310 goto out_device_destroy
;
317 transport_destroy_device(&sdev
->sdev_gendev
);
318 put_device(&sdev
->sdev_gendev
);
320 if (display_failure_msg
)
321 printk(ALLOC_FAILURE_MSG
, __func__
);
325 static void scsi_target_destroy(struct scsi_target
*starget
)
327 struct device
*dev
= &starget
->dev
;
328 struct Scsi_Host
*shost
= dev_to_shost(dev
->parent
);
331 transport_destroy_device(dev
);
332 spin_lock_irqsave(shost
->host_lock
, flags
);
333 if (shost
->hostt
->target_destroy
)
334 shost
->hostt
->target_destroy(starget
);
335 list_del_init(&starget
->siblings
);
336 spin_unlock_irqrestore(shost
->host_lock
, flags
);
340 static void scsi_target_dev_release(struct device
*dev
)
342 struct device
*parent
= dev
->parent
;
343 struct scsi_target
*starget
= to_scsi_target(dev
);
349 static struct device_type scsi_target_type
= {
350 .name
= "scsi_target",
351 .release
= scsi_target_dev_release
,
354 int scsi_is_target_device(const struct device
*dev
)
356 return dev
->type
== &scsi_target_type
;
358 EXPORT_SYMBOL(scsi_is_target_device
);
360 static struct scsi_target
*__scsi_find_target(struct device
*parent
,
361 int channel
, uint id
)
363 struct scsi_target
*starget
, *found_starget
= NULL
;
364 struct Scsi_Host
*shost
= dev_to_shost(parent
);
366 * Search for an existing target for this sdev.
368 list_for_each_entry(starget
, &shost
->__targets
, siblings
) {
369 if (starget
->id
== id
&&
370 starget
->channel
== channel
) {
371 found_starget
= starget
;
376 get_device(&found_starget
->dev
);
378 return found_starget
;
382 * scsi_alloc_target - allocate a new or find an existing target
383 * @parent: parent of the target (need not be a scsi host)
384 * @channel: target channel number (zero if no channels)
385 * @id: target id number
387 * Return an existing target if one exists, provided it hasn't already
388 * gone into STARGET_DEL state, otherwise allocate a new target.
390 * The target is returned with an incremented reference, so the caller
391 * is responsible for both reaping and doing a last put
393 static struct scsi_target
*scsi_alloc_target(struct device
*parent
,
394 int channel
, uint id
)
396 struct Scsi_Host
*shost
= dev_to_shost(parent
);
397 struct device
*dev
= NULL
;
399 const int size
= sizeof(struct scsi_target
)
400 + shost
->transportt
->target_size
;
401 struct scsi_target
*starget
;
402 struct scsi_target
*found_target
;
405 starget
= kzalloc(size
, GFP_KERNEL
);
407 printk(KERN_ERR
"%s: allocation failure\n", __func__
);
411 device_initialize(dev
);
412 starget
->reap_ref
= 1;
413 dev
->parent
= get_device(parent
);
414 sprintf(dev
->bus_id
, "target%d:%d:%d",
415 shost
->host_no
, channel
, id
);
416 #ifndef CONFIG_SYSFS_DEPRECATED
417 dev
->bus
= &scsi_bus_type
;
419 dev
->type
= &scsi_target_type
;
421 starget
->channel
= channel
;
422 starget
->can_queue
= 0;
423 INIT_LIST_HEAD(&starget
->siblings
);
424 INIT_LIST_HEAD(&starget
->devices
);
425 starget
->state
= STARGET_CREATED
;
426 starget
->scsi_level
= SCSI_2
;
428 spin_lock_irqsave(shost
->host_lock
, flags
);
430 found_target
= __scsi_find_target(parent
, channel
, id
);
434 list_add_tail(&starget
->siblings
, &shost
->__targets
);
435 spin_unlock_irqrestore(shost
->host_lock
, flags
);
436 /* allocate and add */
437 transport_setup_device(dev
);
438 if (shost
->hostt
->target_alloc
) {
439 error
= shost
->hostt
->target_alloc(starget
);
442 dev_printk(KERN_ERR
, dev
, "target allocation failed, error %d\n", error
);
443 /* don't want scsi_target_reap to do the final
444 * put because it will be under the host lock */
445 scsi_target_destroy(starget
);
454 found_target
->reap_ref
++;
455 spin_unlock_irqrestore(shost
->host_lock
, flags
);
456 if (found_target
->state
!= STARGET_DEL
) {
461 /* Unfortunately, we found a dying target; need to
462 * wait until it's dead before we can get a new one */
463 put_device(&found_target
->dev
);
464 flush_scheduled_work();
468 static void scsi_target_reap_usercontext(struct work_struct
*work
)
470 struct scsi_target
*starget
=
471 container_of(work
, struct scsi_target
, ew
.work
);
473 transport_remove_device(&starget
->dev
);
474 device_del(&starget
->dev
);
475 scsi_target_destroy(starget
);
479 * scsi_target_reap - check to see if target is in use and destroy if not
480 * @starget: target to be checked
482 * This is used after removing a LUN or doing a last put of the target
483 * it checks atomically that nothing is using the target and removes
486 void scsi_target_reap(struct scsi_target
*starget
)
488 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
490 enum scsi_target_state state
;
493 spin_lock_irqsave(shost
->host_lock
, flags
);
494 state
= starget
->state
;
495 empty
= --starget
->reap_ref
== 0 &&
496 list_empty(&starget
->devices
) ? 1 : 0;
497 spin_unlock_irqrestore(shost
->host_lock
, flags
);
502 BUG_ON(state
== STARGET_DEL
);
503 starget
->state
= STARGET_DEL
;
504 if (state
== STARGET_CREATED
)
505 scsi_target_destroy(starget
);
507 execute_in_process_context(scsi_target_reap_usercontext
,
512 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
513 * @s: INQUIRY result string to sanitize
514 * @len: length of the string
517 * The SCSI spec says that INQUIRY vendor, product, and revision
518 * strings must consist entirely of graphic ASCII characters,
519 * padded on the right with spaces. Since not all devices obey
520 * this rule, we will replace non-graphic or non-ASCII characters
521 * with spaces. Exception: a NUL character is interpreted as a
522 * string terminator, so all the following characters are set to
525 static void sanitize_inquiry_string(unsigned char *s
, int len
)
529 for (; len
> 0; (--len
, ++s
)) {
532 if (terminated
|| *s
< 0x20 || *s
> 0x7e)
538 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
539 * @sdev: scsi_device to probe
540 * @inq_result: area to store the INQUIRY result
541 * @result_len: len of inq_result
542 * @bflags: store any bflags found here
545 * Probe the lun associated with @req using a standard SCSI INQUIRY;
547 * If the INQUIRY is successful, zero is returned and the
548 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
549 * are copied to the scsi_device any flags value is stored in *@bflags.
551 static int scsi_probe_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
552 int result_len
, int *bflags
)
554 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
555 int first_inquiry_len
, try_inquiry_len
, next_inquiry_len
;
556 int response_len
= 0;
557 int pass
, count
, result
;
558 struct scsi_sense_hdr sshdr
;
562 /* Perform up to 3 passes. The first pass uses a conservative
563 * transfer length of 36 unless sdev->inquiry_len specifies a
564 * different value. */
565 first_inquiry_len
= sdev
->inquiry_len
? sdev
->inquiry_len
: 36;
566 try_inquiry_len
= first_inquiry_len
;
570 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
571 "scsi scan: INQUIRY pass %d length %d\n",
572 pass
, try_inquiry_len
));
574 /* Each pass gets up to three chances to ignore Unit Attention */
575 for (count
= 0; count
< 3; ++count
) {
576 memset(scsi_cmd
, 0, 6);
577 scsi_cmd
[0] = INQUIRY
;
578 scsi_cmd
[4] = (unsigned char) try_inquiry_len
;
580 memset(inq_result
, 0, try_inquiry_len
);
582 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
583 inq_result
, try_inquiry_len
, &sshdr
,
584 HZ
/ 2 + HZ
* scsi_inq_timeout
, 3);
586 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: INQUIRY %s "
588 result
? "failed" : "successful", result
));
592 * not-ready to ready transition [asc/ascq=0x28/0x0]
593 * or power-on, reset [asc/ascq=0x29/0x0], continue.
594 * INQUIRY should not yield UNIT_ATTENTION
595 * but many buggy devices do so anyway.
597 if ((driver_byte(result
) & DRIVER_SENSE
) &&
598 scsi_sense_valid(&sshdr
)) {
599 if ((sshdr
.sense_key
== UNIT_ATTENTION
) &&
600 ((sshdr
.asc
== 0x28) ||
601 (sshdr
.asc
== 0x29)) &&
610 sanitize_inquiry_string(&inq_result
[8], 8);
611 sanitize_inquiry_string(&inq_result
[16], 16);
612 sanitize_inquiry_string(&inq_result
[32], 4);
614 response_len
= inq_result
[4] + 5;
615 if (response_len
> 255)
616 response_len
= first_inquiry_len
; /* sanity */
619 * Get any flags for this device.
621 * XXX add a bflags to scsi_device, and replace the
622 * corresponding bit fields in scsi_device, so bflags
623 * need not be passed as an argument.
625 *bflags
= scsi_get_device_flags(sdev
, &inq_result
[8],
628 /* When the first pass succeeds we gain information about
629 * what larger transfer lengths might work. */
631 if (BLIST_INQUIRY_36
& *bflags
)
632 next_inquiry_len
= 36;
633 else if (BLIST_INQUIRY_58
& *bflags
)
634 next_inquiry_len
= 58;
635 else if (sdev
->inquiry_len
)
636 next_inquiry_len
= sdev
->inquiry_len
;
638 next_inquiry_len
= response_len
;
640 /* If more data is available perform the second pass */
641 if (next_inquiry_len
> try_inquiry_len
) {
642 try_inquiry_len
= next_inquiry_len
;
648 } else if (pass
== 2) {
649 printk(KERN_INFO
"scsi scan: %d byte inquiry failed. "
650 "Consider BLIST_INQUIRY_36 for this device\n",
653 /* If this pass failed, the third pass goes back and transfers
654 * the same amount as we successfully got in the first pass. */
655 try_inquiry_len
= first_inquiry_len
;
660 /* If the last transfer attempt got an error, assume the
661 * peripheral doesn't exist or is dead. */
665 /* Don't report any more data than the device says is valid */
666 sdev
->inquiry_len
= min(try_inquiry_len
, response_len
);
669 * XXX Abort if the response length is less than 36? If less than
670 * 32, the lookup of the device flags (above) could be invalid,
671 * and it would be possible to take an incorrect action - we do
672 * not want to hang because of a short INQUIRY. On the flip side,
673 * if the device is spun down or becoming ready (and so it gives a
674 * short INQUIRY), an abort here prevents any further use of the
675 * device, including spin up.
677 * On the whole, the best approach seems to be to assume the first
678 * 36 bytes are valid no matter what the device says. That's
679 * better than copying < 36 bytes to the inquiry-result buffer
680 * and displaying garbage for the Vendor, Product, or Revision
683 if (sdev
->inquiry_len
< 36) {
684 printk(KERN_INFO
"scsi scan: INQUIRY result too short (%d),"
685 " using 36\n", sdev
->inquiry_len
);
686 sdev
->inquiry_len
= 36;
690 * Related to the above issue:
692 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
693 * and if not ready, sent a START_STOP to start (maybe spin up) and
694 * then send the INQUIRY again, since the INQUIRY can change after
695 * a device is initialized.
697 * Ideally, start a device if explicitly asked to do so. This
698 * assumes that a device is spun up on power on, spun down on
699 * request, and then spun up on request.
703 * The scanning code needs to know the scsi_level, even if no
704 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
705 * non-zero LUNs can be scanned.
707 sdev
->scsi_level
= inq_result
[2] & 0x07;
708 if (sdev
->scsi_level
>= 2 ||
709 (sdev
->scsi_level
== 1 && (inq_result
[3] & 0x0f) == 1))
711 sdev
->sdev_target
->scsi_level
= sdev
->scsi_level
;
717 * scsi_add_lun - allocate and fully initialze a scsi_device
718 * @sdev: holds information to be stored in the new scsi_device
719 * @inq_result: holds the result of a previous INQUIRY to the LUN
720 * @bflags: black/white list flag
721 * @async: 1 if this device is being scanned asynchronously
724 * Initialize the scsi_device @sdev. Optionally set fields based
725 * on values in *@bflags.
728 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
729 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
731 static int scsi_add_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
732 int *bflags
, int async
)
737 * XXX do not save the inquiry, since it can change underneath us,
738 * save just vendor/model/rev.
740 * Rather than save it and have an ioctl that retrieves the saved
741 * value, have an ioctl that executes the same INQUIRY code used
742 * in scsi_probe_lun, let user level programs doing INQUIRY
743 * scanning run at their own risk, or supply a user level program
744 * that can correctly scan.
748 * Copy at least 36 bytes of INQUIRY data, so that we don't
749 * dereference unallocated memory when accessing the Vendor,
750 * Product, and Revision strings. Badly behaved devices may set
751 * the INQUIRY Additional Length byte to a small value, indicating
752 * these strings are invalid, but often they contain plausible data
753 * nonetheless. It doesn't matter if the device sent < 36 bytes
754 * total, since scsi_probe_lun() initializes inq_result with 0s.
756 sdev
->inquiry
= kmemdup(inq_result
,
757 max_t(size_t, sdev
->inquiry_len
, 36),
759 if (sdev
->inquiry
== NULL
)
760 return SCSI_SCAN_NO_RESPONSE
;
762 sdev
->vendor
= (char *) (sdev
->inquiry
+ 8);
763 sdev
->model
= (char *) (sdev
->inquiry
+ 16);
764 sdev
->rev
= (char *) (sdev
->inquiry
+ 32);
766 if (*bflags
& BLIST_ISROM
) {
767 sdev
->type
= TYPE_ROM
;
770 sdev
->type
= (inq_result
[0] & 0x1f);
771 sdev
->removable
= (inq_result
[1] & 0x80) >> 7;
774 switch (sdev
->type
) {
782 case TYPE_MEDIUM_CHANGER
:
793 printk(KERN_INFO
"scsi: unknown device type %d\n", sdev
->type
);
796 if (sdev
->type
== TYPE_RBC
|| sdev
->type
== TYPE_ROM
) {
797 /* RBC and MMC devices can return SCSI-3 compliance and yet
798 * still not support REPORT LUNS, so make them act as
799 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
800 * specifically set */
801 if ((*bflags
& BLIST_REPORTLUN2
) == 0)
802 *bflags
|= BLIST_NOREPORTLUN
;
806 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
807 * spec says: The device server is capable of supporting the
808 * specified peripheral device type on this logical unit. However,
809 * the physical device is not currently connected to this logical
812 * The above is vague, as it implies that we could treat 001 and
813 * 011 the same. Stay compatible with previous code, and create a
814 * scsi_device for a PQ of 1
816 * Don't set the device offline here; rather let the upper
817 * level drivers eval the PQ to decide whether they should
818 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
821 sdev
->inq_periph_qual
= (inq_result
[0] >> 5) & 7;
822 sdev
->lockable
= sdev
->removable
;
823 sdev
->soft_reset
= (inq_result
[7] & 1) && ((inq_result
[3] & 7) == 2);
825 if (sdev
->scsi_level
>= SCSI_3
||
826 (sdev
->inquiry_len
> 56 && inq_result
[56] & 0x04))
828 if (inq_result
[7] & 0x60)
830 if (inq_result
[7] & 0x10)
833 sdev_printk(KERN_NOTICE
, sdev
, "%s %.8s %.16s %.4s PQ: %d "
834 "ANSI: %d%s\n", scsi_device_type(sdev
->type
),
835 sdev
->vendor
, sdev
->model
, sdev
->rev
,
836 sdev
->inq_periph_qual
, inq_result
[2] & 0x07,
837 (inq_result
[3] & 0x0f) == 1 ? " CCS" : "");
839 if ((sdev
->scsi_level
>= SCSI_2
) && (inq_result
[7] & 2) &&
840 !(*bflags
& BLIST_NOTQ
))
841 sdev
->tagged_supported
= 1;
844 * Some devices (Texel CD ROM drives) have handshaking problems
845 * when used with the Seagate controllers. borken is initialized
846 * to 1, and then set it to 0 here.
848 if ((*bflags
& BLIST_BORKEN
) == 0)
851 if (*bflags
& BLIST_NO_ULD_ATTACH
)
852 sdev
->no_uld_attach
= 1;
855 * Apparently some really broken devices (contrary to the SCSI
856 * standards) need to be selected without asserting ATN
858 if (*bflags
& BLIST_SELECT_NO_ATN
)
859 sdev
->select_no_atn
= 1;
862 * Maximum 512 sector transfer length
863 * broken RA4x00 Compaq Disk Array
865 if (*bflags
& BLIST_MAX_512
)
866 blk_queue_max_sectors(sdev
->request_queue
, 512);
869 * Some devices may not want to have a start command automatically
870 * issued when a device is added.
872 if (*bflags
& BLIST_NOSTARTONADD
)
873 sdev
->no_start_on_add
= 1;
875 if (*bflags
& BLIST_SINGLELUN
)
876 scsi_target(sdev
)->single_lun
= 1;
878 sdev
->use_10_for_rw
= 1;
880 if (*bflags
& BLIST_MS_SKIP_PAGE_08
)
881 sdev
->skip_ms_page_8
= 1;
883 if (*bflags
& BLIST_MS_SKIP_PAGE_3F
)
884 sdev
->skip_ms_page_3f
= 1;
886 if (*bflags
& BLIST_USE_10_BYTE_MS
)
887 sdev
->use_10_for_ms
= 1;
889 /* set the device running here so that slave configure
891 ret
= scsi_device_set_state(sdev
, SDEV_RUNNING
);
893 ret
= scsi_device_set_state(sdev
, SDEV_BLOCK
);
896 sdev_printk(KERN_ERR
, sdev
,
897 "in wrong state %s to complete scan\n",
898 scsi_device_state_name(sdev
->sdev_state
));
899 return SCSI_SCAN_NO_RESPONSE
;
903 if (*bflags
& BLIST_MS_192_BYTES_FOR_3F
)
904 sdev
->use_192_bytes_for_3f
= 1;
906 if (*bflags
& BLIST_NOT_LOCKABLE
)
909 if (*bflags
& BLIST_RETRY_HWERROR
)
910 sdev
->retry_hwerror
= 1;
912 transport_configure_device(&sdev
->sdev_gendev
);
914 if (sdev
->host
->hostt
->slave_configure
) {
915 ret
= sdev
->host
->hostt
->slave_configure(sdev
);
918 * if LLDD reports slave not present, don't clutter
919 * console with alloc failure messages
922 sdev_printk(KERN_ERR
, sdev
,
923 "failed to configure device\n");
925 return SCSI_SCAN_NO_RESPONSE
;
930 * Ok, the device is now all set up, we can
931 * register it and tell the rest of the kernel
934 if (!async
&& scsi_sysfs_add_sdev(sdev
) != 0)
935 return SCSI_SCAN_NO_RESPONSE
;
937 return SCSI_SCAN_LUN_PRESENT
;
940 static inline void scsi_destroy_sdev(struct scsi_device
*sdev
)
942 scsi_device_set_state(sdev
, SDEV_DEL
);
943 if (sdev
->host
->hostt
->slave_destroy
)
944 sdev
->host
->hostt
->slave_destroy(sdev
);
945 transport_destroy_device(&sdev
->sdev_gendev
);
946 put_device(&sdev
->sdev_gendev
);
949 #ifdef CONFIG_SCSI_LOGGING
951 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
952 * @buf: Output buffer with at least end-first+1 bytes of space
953 * @inq: Inquiry buffer (input)
954 * @first: Offset of string into inq
955 * @end: Index after last character in inq
957 static unsigned char *scsi_inq_str(unsigned char *buf
, unsigned char *inq
,
958 unsigned first
, unsigned end
)
960 unsigned term
= 0, idx
;
962 for (idx
= 0; idx
+ first
< end
&& idx
+ first
< inq
[4] + 5; idx
++) {
963 if (inq
[idx
+first
] > ' ') {
964 buf
[idx
] = inq
[idx
+first
];
976 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
977 * @starget: pointer to target device structure
978 * @lun: LUN of target device
979 * @bflagsp: store bflags here if not NULL
980 * @sdevp: probe the LUN corresponding to this scsi_device
981 * @rescan: if nonzero skip some code only needed on first scan
982 * @hostdata: passed to scsi_alloc_sdev()
985 * Call scsi_probe_lun, if a LUN with an attached device is found,
986 * allocate and set it up by calling scsi_add_lun.
989 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
990 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
991 * attached at the LUN
992 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
994 static int scsi_probe_and_add_lun(struct scsi_target
*starget
,
995 uint lun
, int *bflagsp
,
996 struct scsi_device
**sdevp
, int rescan
,
999 struct scsi_device
*sdev
;
1000 unsigned char *result
;
1001 int bflags
, res
= SCSI_SCAN_NO_RESPONSE
, result_len
= 256;
1002 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1005 * The rescan flag is used as an optimization, the first scan of a
1006 * host adapter calls into here with rescan == 0.
1008 sdev
= scsi_device_lookup_by_target(starget
, lun
);
1010 if (rescan
|| !scsi_device_created(sdev
)) {
1011 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1012 "scsi scan: device exists on %s\n",
1013 sdev
->sdev_gendev
.bus_id
));
1017 scsi_device_put(sdev
);
1020 *bflagsp
= scsi_get_device_flags(sdev
,
1023 return SCSI_SCAN_LUN_PRESENT
;
1025 scsi_device_put(sdev
);
1027 sdev
= scsi_alloc_sdev(starget
, lun
, hostdata
);
1031 result
= kmalloc(result_len
, GFP_ATOMIC
|
1032 ((shost
->unchecked_isa_dma
) ? __GFP_DMA
: 0));
1036 if (scsi_probe_lun(sdev
, result
, result_len
, &bflags
))
1037 goto out_free_result
;
1042 * result contains valid SCSI INQUIRY data.
1044 if (((result
[0] >> 5) == 3) && !(bflags
& BLIST_ATTACH_PQ3
)) {
1046 * For a Peripheral qualifier 3 (011b), the SCSI
1047 * spec says: The device server is not capable of
1048 * supporting a physical device on this logical
1051 * For disks, this implies that there is no
1052 * logical disk configured at sdev->lun, but there
1053 * is a target id responding.
1055 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO
, sdev
, "scsi scan:"
1056 " peripheral qualifier of 3, device not"
1059 SCSI_LOG_SCAN_BUS(1, {
1060 unsigned char vend
[9];
1061 unsigned char mod
[17];
1063 sdev_printk(KERN_INFO
, sdev
,
1064 "scsi scan: consider passing scsi_mod."
1065 "dev_flags=%s:%s:0x240 or 0x1000240\n",
1066 scsi_inq_str(vend
, result
, 8, 16),
1067 scsi_inq_str(mod
, result
, 16, 32));
1072 res
= SCSI_SCAN_TARGET_PRESENT
;
1073 goto out_free_result
;
1077 * Some targets may set slight variations of PQ and PDT to signal
1078 * that no LUN is present, so don't add sdev in these cases.
1079 * Two specific examples are:
1080 * 1) NetApp targets: return PQ=1, PDT=0x1f
1081 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1082 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1085 * 1) SCSI SPC-3, pp. 145-146
1086 * PQ=1: "A peripheral device having the specified peripheral
1087 * device type is not connected to this logical unit. However, the
1088 * device server is capable of supporting the specified peripheral
1089 * device type on this logical unit."
1090 * PDT=0x1f: "Unknown or no device type"
1091 * 2) USB UFI 1.0, p. 20
1092 * PDT=00h Direct-access device (floppy)
1093 * PDT=1Fh none (no FDD connected to the requested logical unit)
1095 if (((result
[0] >> 5) == 1 || starget
->pdt_1f_for_no_lun
) &&
1096 (result
[0] & 0x1f) == 0x1f &&
1097 !scsi_is_wlun(lun
)) {
1098 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1099 "scsi scan: peripheral device type"
1100 " of 31, no device added\n"));
1101 res
= SCSI_SCAN_TARGET_PRESENT
;
1102 goto out_free_result
;
1105 res
= scsi_add_lun(sdev
, result
, &bflags
, shost
->async_scan
);
1106 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1107 if (bflags
& BLIST_KEY
) {
1109 scsi_unlock_floptical(sdev
, result
);
1116 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1118 if (scsi_device_get(sdev
) == 0) {
1121 __scsi_remove_device(sdev
);
1122 res
= SCSI_SCAN_NO_RESPONSE
;
1126 scsi_destroy_sdev(sdev
);
1132 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1133 * @starget: pointer to target structure to scan
1134 * @bflags: black/white list flag for LUN 0
1135 * @scsi_level: Which version of the standard does this device adhere to
1136 * @rescan: passed to scsi_probe_add_lun()
1139 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1140 * scanned) to some maximum lun until a LUN is found with no device
1141 * attached. Use the bflags to figure out any oddities.
1143 * Modifies sdevscan->lun.
1145 static void scsi_sequential_lun_scan(struct scsi_target
*starget
,
1146 int bflags
, int scsi_level
, int rescan
)
1148 unsigned int sparse_lun
, lun
, max_dev_lun
;
1149 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1151 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: Sequential scan of"
1152 "%s\n", starget
->dev
.bus_id
));
1154 max_dev_lun
= min(max_scsi_luns
, shost
->max_lun
);
1156 * If this device is known to support sparse multiple units,
1157 * override the other settings, and scan all of them. Normally,
1158 * SCSI-3 devices should be scanned via the REPORT LUNS.
1160 if (bflags
& BLIST_SPARSELUN
) {
1161 max_dev_lun
= shost
->max_lun
;
1167 * If less than SCSI_1_CSS, and no special lun scaning, stop
1168 * scanning; this matches 2.4 behaviour, but could just be a bug
1169 * (to continue scanning a SCSI_1_CSS device).
1171 * This test is broken. We might not have any device on lun0 for
1172 * a sparselun device, and if that's the case then how would we
1173 * know the real scsi_level, eh? It might make sense to just not
1174 * scan any SCSI_1 device for non-0 luns, but that check would best
1175 * go into scsi_alloc_sdev() and just have it return null when asked
1176 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1178 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1179 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1184 * If this device is known to support multiple units, override
1185 * the other settings, and scan all of them.
1187 if (bflags
& BLIST_FORCELUN
)
1188 max_dev_lun
= shost
->max_lun
;
1190 * REGAL CDC-4X: avoid hang after LUN 4
1192 if (bflags
& BLIST_MAX5LUN
)
1193 max_dev_lun
= min(5U, max_dev_lun
);
1195 * Do not scan SCSI-2 or lower device past LUN 7, unless
1198 if (scsi_level
< SCSI_3
&& !(bflags
& BLIST_LARGELUN
))
1199 max_dev_lun
= min(8U, max_dev_lun
);
1202 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1203 * until we reach the max, or no LUN is found and we are not
1206 for (lun
= 1; lun
< max_dev_lun
; ++lun
)
1207 if ((scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
,
1208 NULL
) != SCSI_SCAN_LUN_PRESENT
) &&
1214 * scsilun_to_int: convert a scsi_lun to an int
1215 * @scsilun: struct scsi_lun to be converted.
1218 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1219 * integer, and return the result. The caller must check for
1220 * truncation before using this function.
1223 * The struct scsi_lun is assumed to be four levels, with each level
1224 * effectively containing a SCSI byte-ordered (big endian) short; the
1225 * addressing bits of each level are ignored (the highest two bits).
1226 * For a description of the LUN format, post SCSI-3 see the SCSI
1227 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1229 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1230 * the integer: 0x0b030a04
1232 int scsilun_to_int(struct scsi_lun
*scsilun
)
1238 for (i
= 0; i
< sizeof(lun
); i
+= 2)
1239 lun
= lun
| (((scsilun
->scsi_lun
[i
] << 8) |
1240 scsilun
->scsi_lun
[i
+ 1]) << (i
* 8));
1243 EXPORT_SYMBOL(scsilun_to_int
);
1246 * int_to_scsilun: reverts an int into a scsi_lun
1247 * @lun: integer to be reverted
1248 * @scsilun: struct scsi_lun to be set.
1251 * Reverts the functionality of the scsilun_to_int, which packed
1252 * an 8-byte lun value into an int. This routine unpacks the int
1253 * back into the lun value.
1254 * Note: the scsilun_to_int() routine does not truly handle all
1255 * 8bytes of the lun value. This functions restores only as much
1256 * as was set by the routine.
1259 * Given an integer : 0x0b030a04, this function returns a
1260 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1263 void int_to_scsilun(unsigned int lun
, struct scsi_lun
*scsilun
)
1267 memset(scsilun
->scsi_lun
, 0, sizeof(scsilun
->scsi_lun
));
1269 for (i
= 0; i
< sizeof(lun
); i
+= 2) {
1270 scsilun
->scsi_lun
[i
] = (lun
>> 8) & 0xFF;
1271 scsilun
->scsi_lun
[i
+1] = lun
& 0xFF;
1275 EXPORT_SYMBOL(int_to_scsilun
);
1278 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1279 * @starget: which target
1280 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1281 * @rescan: nonzero if we can skip code only needed on first scan
1284 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1285 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
1287 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1288 * LUNs even if it's older than SCSI-3.
1289 * If BLIST_NOREPORTLUN is set, return 1 always.
1290 * If BLIST_NOLUN is set, return 0 always.
1293 * 0: scan completed (or no memory, so further scanning is futile)
1294 * 1: could not scan with REPORT LUN
1296 static int scsi_report_lun_scan(struct scsi_target
*starget
, int bflags
,
1300 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
1301 unsigned int length
;
1303 unsigned int num_luns
;
1304 unsigned int retries
;
1306 struct scsi_lun
*lunp
, *lun_data
;
1308 struct scsi_sense_hdr sshdr
;
1309 struct scsi_device
*sdev
;
1310 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
1314 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1315 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1316 * support more than 8 LUNs.
1318 if (bflags
& BLIST_NOREPORTLUN
)
1320 if (starget
->scsi_level
< SCSI_2
&&
1321 starget
->scsi_level
!= SCSI_UNKNOWN
)
1323 if (starget
->scsi_level
< SCSI_3
&&
1324 (!(bflags
& BLIST_REPORTLUN2
) || shost
->max_lun
<= 8))
1326 if (bflags
& BLIST_NOLUN
)
1329 if (!(sdev
= scsi_device_lookup_by_target(starget
, 0))) {
1330 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1333 if (scsi_device_get(sdev
))
1337 sprintf(devname
, "host %d channel %d id %d",
1338 shost
->host_no
, sdev
->channel
, sdev
->id
);
1341 * Allocate enough to hold the header (the same size as one scsi_lun)
1342 * plus the max number of luns we are requesting.
1344 * Reallocating and trying again (with the exact amount we need)
1345 * would be nice, but then we need to somehow limit the size
1346 * allocated based on the available memory and the limits of
1347 * kmalloc - we don't want a kmalloc() failure of a huge value to
1348 * prevent us from finding any LUNs on this target.
1350 length
= (max_scsi_report_luns
+ 1) * sizeof(struct scsi_lun
);
1351 lun_data
= kmalloc(length
, GFP_ATOMIC
|
1352 (sdev
->host
->unchecked_isa_dma
? __GFP_DMA
: 0));
1354 printk(ALLOC_FAILURE_MSG
, __func__
);
1358 scsi_cmd
[0] = REPORT_LUNS
;
1361 * bytes 1 - 5: reserved, set to zero.
1363 memset(&scsi_cmd
[1], 0, 5);
1366 * bytes 6 - 9: length of the command.
1368 scsi_cmd
[6] = (unsigned char) (length
>> 24) & 0xff;
1369 scsi_cmd
[7] = (unsigned char) (length
>> 16) & 0xff;
1370 scsi_cmd
[8] = (unsigned char) (length
>> 8) & 0xff;
1371 scsi_cmd
[9] = (unsigned char) length
& 0xff;
1373 scsi_cmd
[10] = 0; /* reserved */
1374 scsi_cmd
[11] = 0; /* control */
1377 * We can get a UNIT ATTENTION, for example a power on/reset, so
1378 * retry a few times (like sd.c does for TEST UNIT READY).
1379 * Experience shows some combinations of adapter/devices get at
1380 * least two power on/resets.
1382 * Illegal requests (for devices that do not support REPORT LUNS)
1383 * should come through as a check condition, and will not generate
1386 for (retries
= 0; retries
< 3; retries
++) {
1387 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: Sending"
1388 " REPORT LUNS to %s (try %d)\n", devname
,
1391 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
1392 lun_data
, length
, &sshdr
,
1393 SCSI_TIMEOUT
+ 4 * HZ
, 3);
1395 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: REPORT LUNS"
1396 " %s (try %d) result 0x%x\n", result
1397 ? "failed" : "successful", retries
, result
));
1400 else if (scsi_sense_valid(&sshdr
)) {
1401 if (sshdr
.sense_key
!= UNIT_ATTENTION
)
1408 * The device probably does not support a REPORT LUN command
1415 * Get the length from the first four bytes of lun_data.
1417 data
= (u8
*) lun_data
->scsi_lun
;
1418 length
= ((data
[0] << 24) | (data
[1] << 16) |
1419 (data
[2] << 8) | (data
[3] << 0));
1421 num_luns
= (length
/ sizeof(struct scsi_lun
));
1422 if (num_luns
> max_scsi_report_luns
) {
1423 printk(KERN_WARNING
"scsi: On %s only %d (max_scsi_report_luns)"
1424 " of %d luns reported, try increasing"
1425 " max_scsi_report_luns.\n", devname
,
1426 max_scsi_report_luns
, num_luns
);
1427 num_luns
= max_scsi_report_luns
;
1430 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1431 "scsi scan: REPORT LUN scan\n"));
1434 * Scan the luns in lun_data. The entry at offset 0 is really
1435 * the header, so start at 1 and go up to and including num_luns.
1437 for (lunp
= &lun_data
[1]; lunp
<= &lun_data
[num_luns
]; lunp
++) {
1438 lun
= scsilun_to_int(lunp
);
1441 * Check if the unused part of lunp is non-zero, and so
1442 * does not fit in lun.
1444 if (memcmp(&lunp
->scsi_lun
[sizeof(lun
)], "\0\0\0\0", 4)) {
1448 * Output an error displaying the LUN in byte order,
1449 * this differs from what linux would print for the
1450 * integer LUN value.
1452 printk(KERN_WARNING
"scsi: %s lun 0x", devname
);
1453 data
= (char *)lunp
->scsi_lun
;
1454 for (i
= 0; i
< sizeof(struct scsi_lun
); i
++)
1455 printk("%02x", data
[i
]);
1456 printk(" has a LUN larger than currently supported.\n");
1457 } else if (lun
> sdev
->host
->max_lun
) {
1458 printk(KERN_WARNING
"scsi: %s lun%d has a LUN larger"
1459 " than allowed by the host adapter\n",
1464 res
= scsi_probe_and_add_lun(starget
,
1465 lun
, NULL
, NULL
, rescan
, NULL
);
1466 if (res
== SCSI_SCAN_NO_RESPONSE
) {
1468 * Got some results, but now none, abort.
1470 sdev_printk(KERN_ERR
, sdev
,
1471 "Unexpected response"
1472 " from lun %d while scanning, scan"
1482 scsi_device_put(sdev
);
1483 if (scsi_device_created(sdev
))
1485 * the sdev we used didn't appear in the report luns scan
1487 scsi_destroy_sdev(sdev
);
1491 struct scsi_device
*__scsi_add_device(struct Scsi_Host
*shost
, uint channel
,
1492 uint id
, uint lun
, void *hostdata
)
1494 struct scsi_device
*sdev
= ERR_PTR(-ENODEV
);
1495 struct device
*parent
= &shost
->shost_gendev
;
1496 struct scsi_target
*starget
;
1498 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1499 return ERR_PTR(-ENODEV
);
1501 starget
= scsi_alloc_target(parent
, channel
, id
);
1503 return ERR_PTR(-ENOMEM
);
1505 mutex_lock(&shost
->scan_mutex
);
1506 if (!shost
->async_scan
)
1507 scsi_complete_async_scans();
1509 if (scsi_host_scan_allowed(shost
))
1510 scsi_probe_and_add_lun(starget
, lun
, NULL
, &sdev
, 1, hostdata
);
1511 mutex_unlock(&shost
->scan_mutex
);
1512 scsi_target_reap(starget
);
1513 put_device(&starget
->dev
);
1517 EXPORT_SYMBOL(__scsi_add_device
);
1519 int scsi_add_device(struct Scsi_Host
*host
, uint channel
,
1520 uint target
, uint lun
)
1522 struct scsi_device
*sdev
=
1523 __scsi_add_device(host
, channel
, target
, lun
, NULL
);
1525 return PTR_ERR(sdev
);
1527 scsi_device_put(sdev
);
1530 EXPORT_SYMBOL(scsi_add_device
);
1532 void scsi_rescan_device(struct device
*dev
)
1534 struct scsi_driver
*drv
;
1539 drv
= to_scsi_driver(dev
->driver
);
1540 if (try_module_get(drv
->owner
)) {
1543 module_put(drv
->owner
);
1546 EXPORT_SYMBOL(scsi_rescan_device
);
1548 static void __scsi_scan_target(struct device
*parent
, unsigned int channel
,
1549 unsigned int id
, unsigned int lun
, int rescan
)
1551 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1554 struct scsi_target
*starget
;
1556 if (shost
->this_id
== id
)
1558 * Don't scan the host adapter
1562 starget
= scsi_alloc_target(parent
, channel
, id
);
1566 if (lun
!= SCAN_WILD_CARD
) {
1568 * Scan for a specific host/chan/id/lun.
1570 scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
, NULL
);
1575 * Scan LUN 0, if there is some response, scan further. Ideally, we
1576 * would not configure LUN 0 until all LUNs are scanned.
1578 res
= scsi_probe_and_add_lun(starget
, 0, &bflags
, NULL
, rescan
, NULL
);
1579 if (res
== SCSI_SCAN_LUN_PRESENT
|| res
== SCSI_SCAN_TARGET_PRESENT
) {
1580 if (scsi_report_lun_scan(starget
, bflags
, rescan
) != 0)
1582 * The REPORT LUN did not scan the target,
1583 * do a sequential scan.
1585 scsi_sequential_lun_scan(starget
, bflags
,
1586 starget
->scsi_level
, rescan
);
1590 /* now determine if the target has any children at all
1591 * and if not, nuke it */
1592 scsi_target_reap(starget
);
1594 put_device(&starget
->dev
);
1598 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1599 * @parent: host to scan
1600 * @channel: channel to scan
1601 * @id: target id to scan
1602 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1603 * @rescan: passed to LUN scanning routines
1606 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1607 * and possibly all LUNs on the target id.
1609 * First try a REPORT LUN scan, if that does not scan the target, do a
1610 * sequential scan of LUNs on the target id.
1612 void scsi_scan_target(struct device
*parent
, unsigned int channel
,
1613 unsigned int id
, unsigned int lun
, int rescan
)
1615 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1617 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1620 mutex_lock(&shost
->scan_mutex
);
1621 if (!shost
->async_scan
)
1622 scsi_complete_async_scans();
1624 if (scsi_host_scan_allowed(shost
))
1625 __scsi_scan_target(parent
, channel
, id
, lun
, rescan
);
1626 mutex_unlock(&shost
->scan_mutex
);
1628 EXPORT_SYMBOL(scsi_scan_target
);
1630 static void scsi_scan_channel(struct Scsi_Host
*shost
, unsigned int channel
,
1631 unsigned int id
, unsigned int lun
, int rescan
)
1635 if (id
== SCAN_WILD_CARD
)
1636 for (id
= 0; id
< shost
->max_id
; ++id
) {
1638 * XXX adapter drivers when possible (FCP, iSCSI)
1639 * could modify max_id to match the current max,
1640 * not the absolute max.
1642 * XXX add a shost id iterator, so for example,
1643 * the FC ID can be the same as a target id
1644 * without a huge overhead of sparse id's.
1646 if (shost
->reverse_ordering
)
1648 * Scan from high to low id.
1650 order_id
= shost
->max_id
- id
- 1;
1653 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1654 order_id
, lun
, rescan
);
1657 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1661 int scsi_scan_host_selected(struct Scsi_Host
*shost
, unsigned int channel
,
1662 unsigned int id
, unsigned int lun
, int rescan
)
1664 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO
, shost
,
1666 __func__
, channel
, id
, lun
));
1668 if (((channel
!= SCAN_WILD_CARD
) && (channel
> shost
->max_channel
)) ||
1669 ((id
!= SCAN_WILD_CARD
) && (id
>= shost
->max_id
)) ||
1670 ((lun
!= SCAN_WILD_CARD
) && (lun
> shost
->max_lun
)))
1673 mutex_lock(&shost
->scan_mutex
);
1674 if (!shost
->async_scan
)
1675 scsi_complete_async_scans();
1677 if (scsi_host_scan_allowed(shost
)) {
1678 if (channel
== SCAN_WILD_CARD
)
1679 for (channel
= 0; channel
<= shost
->max_channel
;
1681 scsi_scan_channel(shost
, channel
, id
, lun
,
1684 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1686 mutex_unlock(&shost
->scan_mutex
);
1691 static void scsi_sysfs_add_devices(struct Scsi_Host
*shost
)
1693 struct scsi_device
*sdev
;
1694 shost_for_each_device(sdev
, shost
) {
1695 if (!scsi_host_scan_allowed(shost
) ||
1696 scsi_sysfs_add_sdev(sdev
) != 0)
1697 scsi_destroy_sdev(sdev
);
1702 * scsi_prep_async_scan - prepare for an async scan
1703 * @shost: the host which will be scanned
1704 * Returns: a cookie to be passed to scsi_finish_async_scan()
1706 * Tells the midlayer this host is going to do an asynchronous scan.
1707 * It reserves the host's position in the scanning list and ensures
1708 * that other asynchronous scans started after this one won't affect the
1709 * ordering of the discovered devices.
1711 static struct async_scan_data
*scsi_prep_async_scan(struct Scsi_Host
*shost
)
1713 struct async_scan_data
*data
;
1714 unsigned long flags
;
1716 if (strncmp(scsi_scan_type
, "sync", 4) == 0)
1719 if (shost
->async_scan
) {
1720 printk("%s called twice for host %d", __func__
,
1726 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
1729 data
->shost
= scsi_host_get(shost
);
1732 init_completion(&data
->prev_finished
);
1734 mutex_lock(&shost
->scan_mutex
);
1735 spin_lock_irqsave(shost
->host_lock
, flags
);
1736 shost
->async_scan
= 1;
1737 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1738 mutex_unlock(&shost
->scan_mutex
);
1740 spin_lock(&async_scan_lock
);
1741 if (list_empty(&scanning_hosts
))
1742 complete(&data
->prev_finished
);
1743 list_add_tail(&data
->list
, &scanning_hosts
);
1744 spin_unlock(&async_scan_lock
);
1754 * scsi_finish_async_scan - asynchronous scan has finished
1755 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1757 * All the devices currently attached to this host have been found.
1758 * This function announces all the devices it has found to the rest
1761 static void scsi_finish_async_scan(struct async_scan_data
*data
)
1763 struct Scsi_Host
*shost
;
1764 unsigned long flags
;
1769 shost
= data
->shost
;
1771 mutex_lock(&shost
->scan_mutex
);
1773 if (!shost
->async_scan
) {
1774 printk("%s called twice for host %d", __func__
,
1777 mutex_unlock(&shost
->scan_mutex
);
1781 wait_for_completion(&data
->prev_finished
);
1783 scsi_sysfs_add_devices(shost
);
1785 spin_lock_irqsave(shost
->host_lock
, flags
);
1786 shost
->async_scan
= 0;
1787 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1789 mutex_unlock(&shost
->scan_mutex
);
1791 spin_lock(&async_scan_lock
);
1792 list_del(&data
->list
);
1793 if (!list_empty(&scanning_hosts
)) {
1794 struct async_scan_data
*next
= list_entry(scanning_hosts
.next
,
1795 struct async_scan_data
, list
);
1796 complete(&next
->prev_finished
);
1798 spin_unlock(&async_scan_lock
);
1800 scsi_host_put(shost
);
1804 static void do_scsi_scan_host(struct Scsi_Host
*shost
)
1806 if (shost
->hostt
->scan_finished
) {
1807 unsigned long start
= jiffies
;
1808 if (shost
->hostt
->scan_start
)
1809 shost
->hostt
->scan_start(shost
);
1811 while (!shost
->hostt
->scan_finished(shost
, jiffies
- start
))
1814 scsi_scan_host_selected(shost
, SCAN_WILD_CARD
, SCAN_WILD_CARD
,
1819 static int do_scan_async(void *_data
)
1821 struct async_scan_data
*data
= _data
;
1822 do_scsi_scan_host(data
->shost
);
1823 scsi_finish_async_scan(data
);
1828 * scsi_scan_host - scan the given adapter
1829 * @shost: adapter to scan
1831 void scsi_scan_host(struct Scsi_Host
*shost
)
1833 struct task_struct
*p
;
1834 struct async_scan_data
*data
;
1836 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1839 data
= scsi_prep_async_scan(shost
);
1841 do_scsi_scan_host(shost
);
1845 p
= kthread_run(do_scan_async
, data
, "scsi_scan_%d", shost
->host_no
);
1847 do_scan_async(data
);
1849 EXPORT_SYMBOL(scsi_scan_host
);
1851 void scsi_forget_host(struct Scsi_Host
*shost
)
1853 struct scsi_device
*sdev
;
1854 unsigned long flags
;
1857 spin_lock_irqsave(shost
->host_lock
, flags
);
1858 list_for_each_entry(sdev
, &shost
->__devices
, siblings
) {
1859 if (sdev
->sdev_state
== SDEV_DEL
)
1861 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1862 __scsi_remove_device(sdev
);
1865 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1869 * Function: scsi_get_host_dev()
1871 * Purpose: Create a scsi_device that points to the host adapter itself.
1873 * Arguments: SHpnt - Host that needs a scsi_device
1875 * Lock status: None assumed.
1877 * Returns: The scsi_device or NULL
1880 * Attach a single scsi_device to the Scsi_Host - this should
1881 * be made to look like a "pseudo-device" that points to the
1884 * Note - this device is not accessible from any high-level
1885 * drivers (including generics), which is probably not
1886 * optimal. We can add hooks later to attach
1888 struct scsi_device
*scsi_get_host_dev(struct Scsi_Host
*shost
)
1890 struct scsi_device
*sdev
= NULL
;
1891 struct scsi_target
*starget
;
1893 mutex_lock(&shost
->scan_mutex
);
1894 if (!scsi_host_scan_allowed(shost
))
1896 starget
= scsi_alloc_target(&shost
->shost_gendev
, 0, shost
->this_id
);
1900 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1902 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
1905 scsi_target_reap(starget
);
1906 put_device(&starget
->dev
);
1908 mutex_unlock(&shost
->scan_mutex
);
1911 EXPORT_SYMBOL(scsi_get_host_dev
);
1914 * Function: scsi_free_host_dev()
1916 * Purpose: Free a scsi_device that points to the host adapter itself.
1918 * Arguments: SHpnt - Host that needs a scsi_device
1920 * Lock status: None assumed.
1926 void scsi_free_host_dev(struct scsi_device
*sdev
)
1928 BUG_ON(sdev
->id
!= sdev
->host
->this_id
);
1930 scsi_destroy_sdev(sdev
);
1932 EXPORT_SYMBOL(scsi_free_host_dev
);