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 driverfs 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
, int, 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
, int, 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
, int, 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 static DEFINE_SPINLOCK(async_scan_lock
);
125 static LIST_HEAD(scanning_hosts
);
127 struct async_scan_data
{
128 struct list_head list
;
129 struct Scsi_Host
*shost
;
130 struct completion prev_finished
;
134 * scsi_complete_async_scans - Wait for asynchronous scans to complete
136 * Asynchronous scans add themselves to the scanning_hosts list. Once
137 * that list is empty, we know that the scans are complete. Rather than
138 * waking up periodically to check the state of the list, we pretend to be
139 * a scanning task by adding ourselves at the end of the list and going to
140 * sleep. When the task before us wakes us up, we take ourselves off the
143 int scsi_complete_async_scans(void)
145 struct async_scan_data
*data
;
148 if (list_empty(&scanning_hosts
))
150 /* If we can't get memory immediately, that's OK. Just
151 * sleep a little. Even if we never get memory, the async
152 * scans will finish eventually.
154 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
160 init_completion(&data
->prev_finished
);
162 spin_lock(&async_scan_lock
);
163 /* Check that there's still somebody else on the list */
164 if (list_empty(&scanning_hosts
))
166 list_add_tail(&data
->list
, &scanning_hosts
);
167 spin_unlock(&async_scan_lock
);
169 printk(KERN_INFO
"scsi: waiting for bus probes to complete ...\n");
170 wait_for_completion(&data
->prev_finished
);
172 spin_lock(&async_scan_lock
);
173 list_del(&data
->list
);
175 spin_unlock(&async_scan_lock
);
182 /* Only exported for the benefit of scsi_wait_scan */
183 EXPORT_SYMBOL_GPL(scsi_complete_async_scans
);
187 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
188 * @sdev: scsi device to send command to
189 * @result: area to store the result of the MODE SENSE
192 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
193 * Called for BLIST_KEY devices.
195 static void scsi_unlock_floptical(struct scsi_device
*sdev
,
196 unsigned char *result
)
198 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
200 printk(KERN_NOTICE
"scsi: unlocking floptical drive\n");
201 scsi_cmd
[0] = MODE_SENSE
;
205 scsi_cmd
[4] = 0x2a; /* size */
207 scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
, result
, 0x2a, NULL
,
212 * scsi_alloc_sdev - allocate and setup a scsi_Device
215 * Allocate, initialize for io, and return a pointer to a scsi_Device.
216 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
217 * adds scsi_Device to the appropriate list.
220 * scsi_Device pointer, or NULL on failure.
222 static struct scsi_device
*scsi_alloc_sdev(struct scsi_target
*starget
,
223 unsigned int lun
, void *hostdata
)
225 struct scsi_device
*sdev
;
226 int display_failure_msg
= 1, ret
;
227 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
229 sdev
= kzalloc(sizeof(*sdev
) + shost
->transportt
->device_size
,
234 sdev
->vendor
= scsi_null_device_strs
;
235 sdev
->model
= scsi_null_device_strs
;
236 sdev
->rev
= scsi_null_device_strs
;
238 sdev
->id
= starget
->id
;
240 sdev
->channel
= starget
->channel
;
241 sdev
->sdev_state
= SDEV_CREATED
;
242 INIT_LIST_HEAD(&sdev
->siblings
);
243 INIT_LIST_HEAD(&sdev
->same_target_siblings
);
244 INIT_LIST_HEAD(&sdev
->cmd_list
);
245 INIT_LIST_HEAD(&sdev
->starved_entry
);
246 spin_lock_init(&sdev
->list_lock
);
248 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
249 sdev
->sdev_target
= starget
;
251 /* usually NULL and set by ->slave_alloc instead */
252 sdev
->hostdata
= hostdata
;
254 /* if the device needs this changing, it may do so in the
255 * slave_configure function */
256 sdev
->max_device_blocked
= SCSI_DEFAULT_DEVICE_BLOCKED
;
259 * Some low level driver could use device->type
264 * Assume that the device will have handshaking problems,
265 * and then fix this field later if it turns out it
270 sdev
->request_queue
= scsi_alloc_queue(sdev
);
271 if (!sdev
->request_queue
) {
272 /* release fn is set up in scsi_sysfs_device_initialise, so
273 * have to free and put manually here */
274 put_device(&starget
->dev
);
279 sdev
->request_queue
->queuedata
= sdev
;
280 scsi_adjust_queue_depth(sdev
, 0, sdev
->host
->cmd_per_lun
);
282 scsi_sysfs_device_initialize(sdev
);
284 if (shost
->hostt
->slave_alloc
) {
285 ret
= shost
->hostt
->slave_alloc(sdev
);
288 * if LLDD reports slave not present, don't clutter
289 * console with alloc failure messages
292 display_failure_msg
= 0;
293 goto out_device_destroy
;
300 transport_destroy_device(&sdev
->sdev_gendev
);
301 put_device(&sdev
->sdev_gendev
);
303 if (display_failure_msg
)
304 printk(ALLOC_FAILURE_MSG
, __FUNCTION__
);
308 static void scsi_target_dev_release(struct device
*dev
)
310 struct device
*parent
= dev
->parent
;
311 struct scsi_target
*starget
= to_scsi_target(dev
);
317 int scsi_is_target_device(const struct device
*dev
)
319 return dev
->release
== scsi_target_dev_release
;
321 EXPORT_SYMBOL(scsi_is_target_device
);
323 static struct scsi_target
*__scsi_find_target(struct device
*parent
,
324 int channel
, uint id
)
326 struct scsi_target
*starget
, *found_starget
= NULL
;
327 struct Scsi_Host
*shost
= dev_to_shost(parent
);
329 * Search for an existing target for this sdev.
331 list_for_each_entry(starget
, &shost
->__targets
, siblings
) {
332 if (starget
->id
== id
&&
333 starget
->channel
== channel
) {
334 found_starget
= starget
;
339 get_device(&found_starget
->dev
);
341 return found_starget
;
345 * scsi_alloc_target - allocate a new or find an existing target
346 * @parent: parent of the target (need not be a scsi host)
347 * @channel: target channel number (zero if no channels)
348 * @id: target id number
350 * Return an existing target if one exists, provided it hasn't already
351 * gone into STARGET_DEL state, otherwise allocate a new target.
353 * The target is returned with an incremented reference, so the caller
354 * is responsible for both reaping and doing a last put
356 static struct scsi_target
*scsi_alloc_target(struct device
*parent
,
357 int channel
, uint id
)
359 struct Scsi_Host
*shost
= dev_to_shost(parent
);
360 struct device
*dev
= NULL
;
362 const int size
= sizeof(struct scsi_target
)
363 + shost
->transportt
->target_size
;
364 struct scsi_target
*starget
;
365 struct scsi_target
*found_target
;
368 starget
= kzalloc(size
, GFP_KERNEL
);
370 printk(KERN_ERR
"%s: allocation failure\n", __FUNCTION__
);
374 device_initialize(dev
);
375 starget
->reap_ref
= 1;
376 dev
->parent
= get_device(parent
);
377 dev
->release
= scsi_target_dev_release
;
378 sprintf(dev
->bus_id
, "target%d:%d:%d",
379 shost
->host_no
, channel
, id
);
381 starget
->channel
= channel
;
382 INIT_LIST_HEAD(&starget
->siblings
);
383 INIT_LIST_HEAD(&starget
->devices
);
384 starget
->state
= STARGET_RUNNING
;
386 spin_lock_irqsave(shost
->host_lock
, flags
);
388 found_target
= __scsi_find_target(parent
, channel
, id
);
392 list_add_tail(&starget
->siblings
, &shost
->__targets
);
393 spin_unlock_irqrestore(shost
->host_lock
, flags
);
394 /* allocate and add */
395 transport_setup_device(dev
);
396 error
= device_add(dev
);
398 dev_err(dev
, "target device_add failed, error %d\n", error
);
399 spin_lock_irqsave(shost
->host_lock
, flags
);
400 list_del_init(&starget
->siblings
);
401 spin_unlock_irqrestore(shost
->host_lock
, flags
);
402 transport_destroy_device(dev
);
407 transport_add_device(dev
);
408 if (shost
->hostt
->target_alloc
) {
409 error
= shost
->hostt
->target_alloc(starget
);
412 dev_printk(KERN_ERR
, dev
, "target allocation failed, error %d\n", error
);
413 /* don't want scsi_target_reap to do the final
414 * put because it will be under the host lock */
416 scsi_target_reap(starget
);
426 found_target
->reap_ref
++;
427 spin_unlock_irqrestore(shost
->host_lock
, flags
);
428 if (found_target
->state
!= STARGET_DEL
) {
433 /* Unfortunately, we found a dying target; need to
434 * wait until it's dead before we can get a new one */
435 put_device(&found_target
->dev
);
436 flush_scheduled_work();
440 static void scsi_target_reap_usercontext(void *data
)
442 struct scsi_target
*starget
= data
;
443 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
446 transport_remove_device(&starget
->dev
);
447 device_del(&starget
->dev
);
448 transport_destroy_device(&starget
->dev
);
449 spin_lock_irqsave(shost
->host_lock
, flags
);
450 if (shost
->hostt
->target_destroy
)
451 shost
->hostt
->target_destroy(starget
);
452 list_del_init(&starget
->siblings
);
453 spin_unlock_irqrestore(shost
->host_lock
, flags
);
454 put_device(&starget
->dev
);
458 * scsi_target_reap - check to see if target is in use and destroy if not
460 * @starget: target to be checked
462 * This is used after removing a LUN or doing a last put of the target
463 * it checks atomically that nothing is using the target and removes
466 void scsi_target_reap(struct scsi_target
*starget
)
468 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
471 spin_lock_irqsave(shost
->host_lock
, flags
);
473 if (--starget
->reap_ref
== 0 && list_empty(&starget
->devices
)) {
474 BUG_ON(starget
->state
== STARGET_DEL
);
475 starget
->state
= STARGET_DEL
;
476 spin_unlock_irqrestore(shost
->host_lock
, flags
);
477 execute_in_process_context(scsi_target_reap_usercontext
,
478 starget
, &starget
->ew
);
482 spin_unlock_irqrestore(shost
->host_lock
, flags
);
488 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
489 * @s: INQUIRY result string to sanitize
490 * @len: length of the string
493 * The SCSI spec says that INQUIRY vendor, product, and revision
494 * strings must consist entirely of graphic ASCII characters,
495 * padded on the right with spaces. Since not all devices obey
496 * this rule, we will replace non-graphic or non-ASCII characters
497 * with spaces. Exception: a NUL character is interpreted as a
498 * string terminator, so all the following characters are set to
501 static void sanitize_inquiry_string(unsigned char *s
, int len
)
505 for (; len
> 0; (--len
, ++s
)) {
508 if (terminated
|| *s
< 0x20 || *s
> 0x7e)
514 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
515 * @sdev: scsi_device to probe
516 * @inq_result: area to store the INQUIRY result
517 * @result_len: len of inq_result
518 * @bflags: store any bflags found here
521 * Probe the lun associated with @req using a standard SCSI INQUIRY;
523 * If the INQUIRY is successful, zero is returned and the
524 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
525 * are copied to the scsi_device any flags value is stored in *@bflags.
527 static int scsi_probe_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
528 int result_len
, int *bflags
)
530 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
531 int first_inquiry_len
, try_inquiry_len
, next_inquiry_len
;
532 int response_len
= 0;
533 int pass
, count
, result
;
534 struct scsi_sense_hdr sshdr
;
538 /* Perform up to 3 passes. The first pass uses a conservative
539 * transfer length of 36 unless sdev->inquiry_len specifies a
540 * different value. */
541 first_inquiry_len
= sdev
->inquiry_len
? sdev
->inquiry_len
: 36;
542 try_inquiry_len
= first_inquiry_len
;
546 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
547 "scsi scan: INQUIRY pass %d length %d\n",
548 pass
, try_inquiry_len
));
550 /* Each pass gets up to three chances to ignore Unit Attention */
551 for (count
= 0; count
< 3; ++count
) {
552 memset(scsi_cmd
, 0, 6);
553 scsi_cmd
[0] = INQUIRY
;
554 scsi_cmd
[4] = (unsigned char) try_inquiry_len
;
556 memset(inq_result
, 0, try_inquiry_len
);
558 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
559 inq_result
, try_inquiry_len
, &sshdr
,
560 HZ
/ 2 + HZ
* scsi_inq_timeout
, 3);
562 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: INQUIRY %s "
564 result
? "failed" : "successful", result
));
568 * not-ready to ready transition [asc/ascq=0x28/0x0]
569 * or power-on, reset [asc/ascq=0x29/0x0], continue.
570 * INQUIRY should not yield UNIT_ATTENTION
571 * but many buggy devices do so anyway.
573 if ((driver_byte(result
) & DRIVER_SENSE
) &&
574 scsi_sense_valid(&sshdr
)) {
575 if ((sshdr
.sense_key
== UNIT_ATTENTION
) &&
576 ((sshdr
.asc
== 0x28) ||
577 (sshdr
.asc
== 0x29)) &&
586 sanitize_inquiry_string(&inq_result
[8], 8);
587 sanitize_inquiry_string(&inq_result
[16], 16);
588 sanitize_inquiry_string(&inq_result
[32], 4);
590 response_len
= inq_result
[4] + 5;
591 if (response_len
> 255)
592 response_len
= first_inquiry_len
; /* sanity */
595 * Get any flags for this device.
597 * XXX add a bflags to scsi_device, and replace the
598 * corresponding bit fields in scsi_device, so bflags
599 * need not be passed as an argument.
601 *bflags
= scsi_get_device_flags(sdev
, &inq_result
[8],
604 /* When the first pass succeeds we gain information about
605 * what larger transfer lengths might work. */
607 if (BLIST_INQUIRY_36
& *bflags
)
608 next_inquiry_len
= 36;
609 else if (BLIST_INQUIRY_58
& *bflags
)
610 next_inquiry_len
= 58;
611 else if (sdev
->inquiry_len
)
612 next_inquiry_len
= sdev
->inquiry_len
;
614 next_inquiry_len
= response_len
;
616 /* If more data is available perform the second pass */
617 if (next_inquiry_len
> try_inquiry_len
) {
618 try_inquiry_len
= next_inquiry_len
;
624 } else if (pass
== 2) {
625 printk(KERN_INFO
"scsi scan: %d byte inquiry failed. "
626 "Consider BLIST_INQUIRY_36 for this device\n",
629 /* If this pass failed, the third pass goes back and transfers
630 * the same amount as we successfully got in the first pass. */
631 try_inquiry_len
= first_inquiry_len
;
636 /* If the last transfer attempt got an error, assume the
637 * peripheral doesn't exist or is dead. */
641 /* Don't report any more data than the device says is valid */
642 sdev
->inquiry_len
= min(try_inquiry_len
, response_len
);
645 * XXX Abort if the response length is less than 36? If less than
646 * 32, the lookup of the device flags (above) could be invalid,
647 * and it would be possible to take an incorrect action - we do
648 * not want to hang because of a short INQUIRY. On the flip side,
649 * if the device is spun down or becoming ready (and so it gives a
650 * short INQUIRY), an abort here prevents any further use of the
651 * device, including spin up.
653 * Related to the above issue:
655 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
656 * and if not ready, sent a START_STOP to start (maybe spin up) and
657 * then send the INQUIRY again, since the INQUIRY can change after
658 * a device is initialized.
660 * Ideally, start a device if explicitly asked to do so. This
661 * assumes that a device is spun up on power on, spun down on
662 * request, and then spun up on request.
666 * The scanning code needs to know the scsi_level, even if no
667 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
668 * non-zero LUNs can be scanned.
670 sdev
->scsi_level
= inq_result
[2] & 0x07;
671 if (sdev
->scsi_level
>= 2 ||
672 (sdev
->scsi_level
== 1 && (inq_result
[3] & 0x0f) == 1))
674 sdev
->sdev_target
->scsi_level
= sdev
->scsi_level
;
680 * scsi_add_lun - allocate and fully initialze a scsi_device
681 * @sdevscan: holds information to be stored in the new scsi_device
682 * @sdevnew: store the address of the newly allocated scsi_device
683 * @inq_result: holds the result of a previous INQUIRY to the LUN
684 * @bflags: black/white list flag
687 * Allocate and initialize a scsi_device matching sdevscan. Optionally
688 * set fields based on values in *@bflags. If @sdevnew is not
689 * NULL, store the address of the new scsi_device in *@sdevnew (needed
690 * when scanning a particular LUN).
693 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
694 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
696 static int scsi_add_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
697 int *bflags
, int async
)
700 * XXX do not save the inquiry, since it can change underneath us,
701 * save just vendor/model/rev.
703 * Rather than save it and have an ioctl that retrieves the saved
704 * value, have an ioctl that executes the same INQUIRY code used
705 * in scsi_probe_lun, let user level programs doing INQUIRY
706 * scanning run at their own risk, or supply a user level program
707 * that can correctly scan.
711 * Copy at least 36 bytes of INQUIRY data, so that we don't
712 * dereference unallocated memory when accessing the Vendor,
713 * Product, and Revision strings. Badly behaved devices may set
714 * the INQUIRY Additional Length byte to a small value, indicating
715 * these strings are invalid, but often they contain plausible data
716 * nonetheless. It doesn't matter if the device sent < 36 bytes
717 * total, since scsi_probe_lun() initializes inq_result with 0s.
719 sdev
->inquiry
= kmemdup(inq_result
,
720 max_t(size_t, sdev
->inquiry_len
, 36),
722 if (sdev
->inquiry
== NULL
)
723 return SCSI_SCAN_NO_RESPONSE
;
725 sdev
->vendor
= (char *) (sdev
->inquiry
+ 8);
726 sdev
->model
= (char *) (sdev
->inquiry
+ 16);
727 sdev
->rev
= (char *) (sdev
->inquiry
+ 32);
729 if (*bflags
& BLIST_ISROM
) {
731 * It would be better to modify sdev->type, and set
732 * sdev->removable; this can now be done since
733 * print_inquiry has gone away.
735 inq_result
[0] = TYPE_ROM
;
736 inq_result
[1] |= 0x80; /* removable */
737 } else if (*bflags
& BLIST_NO_ULD_ATTACH
)
738 sdev
->no_uld_attach
= 1;
740 switch (sdev
->type
= (inq_result
[0] & 0x1f)) {
747 case TYPE_MEDIUM_CHANGER
:
759 printk(KERN_INFO
"scsi: unknown device type %d\n", sdev
->type
);
763 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
764 * spec says: The device server is capable of supporting the
765 * specified peripheral device type on this logical unit. However,
766 * the physical device is not currently connected to this logical
769 * The above is vague, as it implies that we could treat 001 and
770 * 011 the same. Stay compatible with previous code, and create a
771 * scsi_device for a PQ of 1
773 * Don't set the device offline here; rather let the upper
774 * level drivers eval the PQ to decide whether they should
775 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
778 sdev
->inq_periph_qual
= (inq_result
[0] >> 5) & 7;
779 sdev
->removable
= (0x80 & inq_result
[1]) >> 7;
780 sdev
->lockable
= sdev
->removable
;
781 sdev
->soft_reset
= (inq_result
[7] & 1) && ((inq_result
[3] & 7) == 2);
783 if (sdev
->scsi_level
>= SCSI_3
|| (sdev
->inquiry_len
> 56 &&
784 inq_result
[56] & 0x04))
786 if (inq_result
[7] & 0x60)
788 if (inq_result
[7] & 0x10)
791 sdev_printk(KERN_NOTICE
, sdev
, "%s %.8s %.16s %.4s PQ: %d "
792 "ANSI: %d%s\n", scsi_device_type(sdev
->type
),
793 sdev
->vendor
, sdev
->model
, sdev
->rev
,
794 sdev
->inq_periph_qual
, inq_result
[2] & 0x07,
795 (inq_result
[3] & 0x0f) == 1 ? " CCS" : "");
801 if ((sdev
->scsi_level
>= SCSI_2
) && (inq_result
[7] & 2) &&
802 !(*bflags
& BLIST_NOTQ
))
803 sdev
->tagged_supported
= 1;
805 * Some devices (Texel CD ROM drives) have handshaking problems
806 * when used with the Seagate controllers. borken is initialized
807 * to 1, and then set it to 0 here.
809 if ((*bflags
& BLIST_BORKEN
) == 0)
813 * Apparently some really broken devices (contrary to the SCSI
814 * standards) need to be selected without asserting ATN
816 if (*bflags
& BLIST_SELECT_NO_ATN
)
817 sdev
->select_no_atn
= 1;
820 * Maximum 512 sector transfer length
821 * broken RA4x00 Compaq Disk Array
823 if (*bflags
& BLIST_MAX_512
)
824 blk_queue_max_sectors(sdev
->request_queue
, 512);
827 * Some devices may not want to have a start command automatically
828 * issued when a device is added.
830 if (*bflags
& BLIST_NOSTARTONADD
)
831 sdev
->no_start_on_add
= 1;
833 if (*bflags
& BLIST_SINGLELUN
)
834 sdev
->single_lun
= 1;
837 sdev
->use_10_for_rw
= 1;
839 if (*bflags
& BLIST_MS_SKIP_PAGE_08
)
840 sdev
->skip_ms_page_8
= 1;
842 if (*bflags
& BLIST_MS_SKIP_PAGE_3F
)
843 sdev
->skip_ms_page_3f
= 1;
845 if (*bflags
& BLIST_USE_10_BYTE_MS
)
846 sdev
->use_10_for_ms
= 1;
848 /* set the device running here so that slave configure
850 scsi_device_set_state(sdev
, SDEV_RUNNING
);
852 if (*bflags
& BLIST_MS_192_BYTES_FOR_3F
)
853 sdev
->use_192_bytes_for_3f
= 1;
855 if (*bflags
& BLIST_NOT_LOCKABLE
)
858 if (*bflags
& BLIST_RETRY_HWERROR
)
859 sdev
->retry_hwerror
= 1;
861 transport_configure_device(&sdev
->sdev_gendev
);
863 if (sdev
->host
->hostt
->slave_configure
) {
864 int ret
= sdev
->host
->hostt
->slave_configure(sdev
);
867 * if LLDD reports slave not present, don't clutter
868 * console with alloc failure messages
871 sdev_printk(KERN_ERR
, sdev
,
872 "failed to configure device\n");
874 return SCSI_SCAN_NO_RESPONSE
;
879 * Ok, the device is now all set up, we can
880 * register it and tell the rest of the kernel
883 if (!async
&& scsi_sysfs_add_sdev(sdev
) != 0)
884 return SCSI_SCAN_NO_RESPONSE
;
886 return SCSI_SCAN_LUN_PRESENT
;
889 static inline void scsi_destroy_sdev(struct scsi_device
*sdev
)
891 scsi_device_set_state(sdev
, SDEV_DEL
);
892 if (sdev
->host
->hostt
->slave_destroy
)
893 sdev
->host
->hostt
->slave_destroy(sdev
);
894 transport_destroy_device(&sdev
->sdev_gendev
);
895 put_device(&sdev
->sdev_gendev
);
898 #ifdef CONFIG_SCSI_LOGGING
900 * scsi_inq_str - print INQUIRY data from min to max index,
901 * strip trailing whitespace
902 * @buf: Output buffer with at least end-first+1 bytes of space
903 * @inq: Inquiry buffer (input)
904 * @first: Offset of string into inq
905 * @end: Index after last character in inq
907 static unsigned char *scsi_inq_str(unsigned char *buf
, unsigned char *inq
,
908 unsigned first
, unsigned end
)
910 unsigned term
= 0, idx
;
912 for (idx
= 0; idx
+ first
< end
&& idx
+ first
< inq
[4] + 5; idx
++) {
913 if (inq
[idx
+first
] > ' ') {
914 buf
[idx
] = inq
[idx
+first
];
926 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
927 * @starget: pointer to target device structure
928 * @lun: LUN of target device
929 * @sdevscan: probe the LUN corresponding to this scsi_device
930 * @sdevnew: store the value of any new scsi_device allocated
931 * @bflagsp: store bflags here if not NULL
934 * Call scsi_probe_lun, if a LUN with an attached device is found,
935 * allocate and set it up by calling scsi_add_lun.
938 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
939 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
940 * attached at the LUN
941 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
943 static int scsi_probe_and_add_lun(struct scsi_target
*starget
,
944 uint lun
, int *bflagsp
,
945 struct scsi_device
**sdevp
, int rescan
,
948 struct scsi_device
*sdev
;
949 unsigned char *result
;
950 int bflags
, res
= SCSI_SCAN_NO_RESPONSE
, result_len
= 256;
951 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
954 * The rescan flag is used as an optimization, the first scan of a
955 * host adapter calls into here with rescan == 0.
957 sdev
= scsi_device_lookup_by_target(starget
, lun
);
959 if (rescan
|| sdev
->sdev_state
!= SDEV_CREATED
) {
960 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
961 "scsi scan: device exists on %s\n",
962 sdev
->sdev_gendev
.bus_id
));
966 scsi_device_put(sdev
);
969 *bflagsp
= scsi_get_device_flags(sdev
,
972 return SCSI_SCAN_LUN_PRESENT
;
974 scsi_device_put(sdev
);
976 sdev
= scsi_alloc_sdev(starget
, lun
, hostdata
);
980 result
= kmalloc(result_len
, GFP_ATOMIC
|
981 ((shost
->unchecked_isa_dma
) ? __GFP_DMA
: 0));
985 if (scsi_probe_lun(sdev
, result
, result_len
, &bflags
))
986 goto out_free_result
;
991 * result contains valid SCSI INQUIRY data.
993 if (((result
[0] >> 5) == 3) && !(bflags
& BLIST_ATTACH_PQ3
)) {
995 * For a Peripheral qualifier 3 (011b), the SCSI
996 * spec says: The device server is not capable of
997 * supporting a physical device on this logical
1000 * For disks, this implies that there is no
1001 * logical disk configured at sdev->lun, but there
1002 * is a target id responding.
1004 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO
, sdev
, "scsi scan:"
1005 " peripheral qualifier of 3, device not"
1008 SCSI_LOG_SCAN_BUS(1, {
1009 unsigned char vend
[9];
1010 unsigned char mod
[17];
1012 sdev_printk(KERN_INFO
, sdev
,
1013 "scsi scan: consider passing scsi_mod."
1014 "dev_flags=%s:%s:0x240 or 0x800240\n",
1015 scsi_inq_str(vend
, result
, 8, 16),
1016 scsi_inq_str(mod
, result
, 16, 32));
1020 res
= SCSI_SCAN_TARGET_PRESENT
;
1021 goto out_free_result
;
1025 * Some targets may set slight variations of PQ and PDT to signal
1026 * that no LUN is present, so don't add sdev in these cases.
1027 * Two specific examples are:
1028 * 1) NetApp targets: return PQ=1, PDT=0x1f
1029 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1030 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1033 * 1) SCSI SPC-3, pp. 145-146
1034 * PQ=1: "A peripheral device having the specified peripheral
1035 * device type is not connected to this logical unit. However, the
1036 * device server is capable of supporting the specified peripheral
1037 * device type on this logical unit."
1038 * PDT=0x1f: "Unknown or no device type"
1039 * 2) USB UFI 1.0, p. 20
1040 * PDT=00h Direct-access device (floppy)
1041 * PDT=1Fh none (no FDD connected to the requested logical unit)
1043 if (((result
[0] >> 5) == 1 || starget
->pdt_1f_for_no_lun
) &&
1044 (result
[0] & 0x1f) == 0x1f) {
1045 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1046 "scsi scan: peripheral device type"
1047 " of 31, no device added\n"));
1048 res
= SCSI_SCAN_TARGET_PRESENT
;
1049 goto out_free_result
;
1052 res
= scsi_add_lun(sdev
, result
, &bflags
, shost
->async_scan
);
1053 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1054 if (bflags
& BLIST_KEY
) {
1056 scsi_unlock_floptical(sdev
, result
);
1063 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1065 if (scsi_device_get(sdev
) == 0) {
1068 __scsi_remove_device(sdev
);
1069 res
= SCSI_SCAN_NO_RESPONSE
;
1073 scsi_destroy_sdev(sdev
);
1079 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1080 * @starget: pointer to target structure to scan
1081 * @bflags: black/white list flag for LUN 0
1084 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1085 * scanned) to some maximum lun until a LUN is found with no device
1086 * attached. Use the bflags to figure out any oddities.
1088 * Modifies sdevscan->lun.
1090 static void scsi_sequential_lun_scan(struct scsi_target
*starget
,
1091 int bflags
, int scsi_level
, int rescan
)
1093 unsigned int sparse_lun
, lun
, max_dev_lun
;
1094 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1096 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: Sequential scan of"
1097 "%s\n", starget
->dev
.bus_id
));
1099 max_dev_lun
= min(max_scsi_luns
, shost
->max_lun
);
1101 * If this device is known to support sparse multiple units,
1102 * override the other settings, and scan all of them. Normally,
1103 * SCSI-3 devices should be scanned via the REPORT LUNS.
1105 if (bflags
& BLIST_SPARSELUN
) {
1106 max_dev_lun
= shost
->max_lun
;
1112 * If less than SCSI_1_CSS, and no special lun scaning, stop
1113 * scanning; this matches 2.4 behaviour, but could just be a bug
1114 * (to continue scanning a SCSI_1_CSS device).
1116 * This test is broken. We might not have any device on lun0 for
1117 * a sparselun device, and if that's the case then how would we
1118 * know the real scsi_level, eh? It might make sense to just not
1119 * scan any SCSI_1 device for non-0 luns, but that check would best
1120 * go into scsi_alloc_sdev() and just have it return null when asked
1121 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1123 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1124 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1129 * If this device is known to support multiple units, override
1130 * the other settings, and scan all of them.
1132 if (bflags
& BLIST_FORCELUN
)
1133 max_dev_lun
= shost
->max_lun
;
1135 * REGAL CDC-4X: avoid hang after LUN 4
1137 if (bflags
& BLIST_MAX5LUN
)
1138 max_dev_lun
= min(5U, max_dev_lun
);
1140 * Do not scan SCSI-2 or lower device past LUN 7, unless
1143 if (scsi_level
< SCSI_3
&& !(bflags
& BLIST_LARGELUN
))
1144 max_dev_lun
= min(8U, max_dev_lun
);
1147 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1148 * until we reach the max, or no LUN is found and we are not
1151 for (lun
= 1; lun
< max_dev_lun
; ++lun
)
1152 if ((scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
,
1153 NULL
) != SCSI_SCAN_LUN_PRESENT
) &&
1159 * scsilun_to_int: convert a scsi_lun to an int
1160 * @scsilun: struct scsi_lun to be converted.
1163 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1164 * integer, and return the result. The caller must check for
1165 * truncation before using this function.
1168 * The struct scsi_lun is assumed to be four levels, with each level
1169 * effectively containing a SCSI byte-ordered (big endian) short; the
1170 * addressing bits of each level are ignored (the highest two bits).
1171 * For a description of the LUN format, post SCSI-3 see the SCSI
1172 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1174 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1175 * the integer: 0x0b030a04
1177 static int scsilun_to_int(struct scsi_lun
*scsilun
)
1183 for (i
= 0; i
< sizeof(lun
); i
+= 2)
1184 lun
= lun
| (((scsilun
->scsi_lun
[i
] << 8) |
1185 scsilun
->scsi_lun
[i
+ 1]) << (i
* 8));
1190 * int_to_scsilun: reverts an int into a scsi_lun
1191 * @int: integer to be reverted
1192 * @scsilun: struct scsi_lun to be set.
1195 * Reverts the functionality of the scsilun_to_int, which packed
1196 * an 8-byte lun value into an int. This routine unpacks the int
1197 * back into the lun value.
1198 * Note: the scsilun_to_int() routine does not truly handle all
1199 * 8bytes of the lun value. This functions restores only as much
1200 * as was set by the routine.
1203 * Given an integer : 0x0b030a04, this function returns a
1204 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1207 void int_to_scsilun(unsigned int lun
, struct scsi_lun
*scsilun
)
1211 memset(scsilun
->scsi_lun
, 0, sizeof(scsilun
->scsi_lun
));
1213 for (i
= 0; i
< sizeof(lun
); i
+= 2) {
1214 scsilun
->scsi_lun
[i
] = (lun
>> 8) & 0xFF;
1215 scsilun
->scsi_lun
[i
+1] = lun
& 0xFF;
1219 EXPORT_SYMBOL(int_to_scsilun
);
1222 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1223 * @sdevscan: scan the host, channel, and id of this scsi_device
1226 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1227 * command, and scan the resulting list of LUNs by calling
1228 * scsi_probe_and_add_lun.
1230 * Modifies sdevscan->lun.
1233 * 0: scan completed (or no memory, so further scanning is futile)
1234 * 1: no report lun scan, or not configured
1236 static int scsi_report_lun_scan(struct scsi_target
*starget
, int bflags
,
1240 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
1241 unsigned int length
;
1243 unsigned int num_luns
;
1244 unsigned int retries
;
1246 struct scsi_lun
*lunp
, *lun_data
;
1248 struct scsi_sense_hdr sshdr
;
1249 struct scsi_device
*sdev
;
1250 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
1254 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1255 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1256 * support more than 8 LUNs.
1258 if (bflags
& BLIST_NOREPORTLUN
)
1260 if (starget
->scsi_level
< SCSI_2
&&
1261 starget
->scsi_level
!= SCSI_UNKNOWN
)
1263 if (starget
->scsi_level
< SCSI_3
&&
1264 (!(bflags
& BLIST_REPORTLUN2
) || shost
->max_lun
<= 8))
1266 if (bflags
& BLIST_NOLUN
)
1269 if (!(sdev
= scsi_device_lookup_by_target(starget
, 0))) {
1270 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1273 if (scsi_device_get(sdev
))
1277 sprintf(devname
, "host %d channel %d id %d",
1278 shost
->host_no
, sdev
->channel
, sdev
->id
);
1281 * Allocate enough to hold the header (the same size as one scsi_lun)
1282 * plus the max number of luns we are requesting.
1284 * Reallocating and trying again (with the exact amount we need)
1285 * would be nice, but then we need to somehow limit the size
1286 * allocated based on the available memory and the limits of
1287 * kmalloc - we don't want a kmalloc() failure of a huge value to
1288 * prevent us from finding any LUNs on this target.
1290 length
= (max_scsi_report_luns
+ 1) * sizeof(struct scsi_lun
);
1291 lun_data
= kmalloc(length
, GFP_ATOMIC
|
1292 (sdev
->host
->unchecked_isa_dma
? __GFP_DMA
: 0));
1294 printk(ALLOC_FAILURE_MSG
, __FUNCTION__
);
1298 scsi_cmd
[0] = REPORT_LUNS
;
1301 * bytes 1 - 5: reserved, set to zero.
1303 memset(&scsi_cmd
[1], 0, 5);
1306 * bytes 6 - 9: length of the command.
1308 scsi_cmd
[6] = (unsigned char) (length
>> 24) & 0xff;
1309 scsi_cmd
[7] = (unsigned char) (length
>> 16) & 0xff;
1310 scsi_cmd
[8] = (unsigned char) (length
>> 8) & 0xff;
1311 scsi_cmd
[9] = (unsigned char) length
& 0xff;
1313 scsi_cmd
[10] = 0; /* reserved */
1314 scsi_cmd
[11] = 0; /* control */
1317 * We can get a UNIT ATTENTION, for example a power on/reset, so
1318 * retry a few times (like sd.c does for TEST UNIT READY).
1319 * Experience shows some combinations of adapter/devices get at
1320 * least two power on/resets.
1322 * Illegal requests (for devices that do not support REPORT LUNS)
1323 * should come through as a check condition, and will not generate
1326 for (retries
= 0; retries
< 3; retries
++) {
1327 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: Sending"
1328 " REPORT LUNS to %s (try %d)\n", devname
,
1331 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
1332 lun_data
, length
, &sshdr
,
1333 SCSI_TIMEOUT
+ 4 * HZ
, 3);
1335 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: REPORT LUNS"
1336 " %s (try %d) result 0x%x\n", result
1337 ? "failed" : "successful", retries
, result
));
1340 else if (scsi_sense_valid(&sshdr
)) {
1341 if (sshdr
.sense_key
!= UNIT_ATTENTION
)
1348 * The device probably does not support a REPORT LUN command
1355 * Get the length from the first four bytes of lun_data.
1357 data
= (u8
*) lun_data
->scsi_lun
;
1358 length
= ((data
[0] << 24) | (data
[1] << 16) |
1359 (data
[2] << 8) | (data
[3] << 0));
1361 num_luns
= (length
/ sizeof(struct scsi_lun
));
1362 if (num_luns
> max_scsi_report_luns
) {
1363 printk(KERN_WARNING
"scsi: On %s only %d (max_scsi_report_luns)"
1364 " of %d luns reported, try increasing"
1365 " max_scsi_report_luns.\n", devname
,
1366 max_scsi_report_luns
, num_luns
);
1367 num_luns
= max_scsi_report_luns
;
1370 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1371 "scsi scan: REPORT LUN scan\n"));
1374 * Scan the luns in lun_data. The entry at offset 0 is really
1375 * the header, so start at 1 and go up to and including num_luns.
1377 for (lunp
= &lun_data
[1]; lunp
<= &lun_data
[num_luns
]; lunp
++) {
1378 lun
= scsilun_to_int(lunp
);
1381 * Check if the unused part of lunp is non-zero, and so
1382 * does not fit in lun.
1384 if (memcmp(&lunp
->scsi_lun
[sizeof(lun
)], "\0\0\0\0", 4)) {
1388 * Output an error displaying the LUN in byte order,
1389 * this differs from what linux would print for the
1390 * integer LUN value.
1392 printk(KERN_WARNING
"scsi: %s lun 0x", devname
);
1393 data
= (char *)lunp
->scsi_lun
;
1394 for (i
= 0; i
< sizeof(struct scsi_lun
); i
++)
1395 printk("%02x", data
[i
]);
1396 printk(" has a LUN larger than currently supported.\n");
1397 } else if (lun
> sdev
->host
->max_lun
) {
1398 printk(KERN_WARNING
"scsi: %s lun%d has a LUN larger"
1399 " than allowed by the host adapter\n",
1404 res
= scsi_probe_and_add_lun(starget
,
1405 lun
, NULL
, NULL
, rescan
, NULL
);
1406 if (res
== SCSI_SCAN_NO_RESPONSE
) {
1408 * Got some results, but now none, abort.
1410 sdev_printk(KERN_ERR
, sdev
,
1411 "Unexpected response"
1412 " from lun %d while scanning, scan"
1422 scsi_device_put(sdev
);
1423 if (sdev
->sdev_state
== SDEV_CREATED
)
1425 * the sdev we used didn't appear in the report luns scan
1427 scsi_destroy_sdev(sdev
);
1431 struct scsi_device
*__scsi_add_device(struct Scsi_Host
*shost
, uint channel
,
1432 uint id
, uint lun
, void *hostdata
)
1434 struct scsi_device
*sdev
= ERR_PTR(-ENODEV
);
1435 struct device
*parent
= &shost
->shost_gendev
;
1436 struct scsi_target
*starget
;
1438 starget
= scsi_alloc_target(parent
, channel
, id
);
1440 return ERR_PTR(-ENOMEM
);
1442 mutex_lock(&shost
->scan_mutex
);
1443 if (scsi_host_scan_allowed(shost
))
1444 scsi_probe_and_add_lun(starget
, lun
, NULL
, &sdev
, 1, hostdata
);
1445 mutex_unlock(&shost
->scan_mutex
);
1446 scsi_target_reap(starget
);
1447 put_device(&starget
->dev
);
1451 EXPORT_SYMBOL(__scsi_add_device
);
1453 int scsi_add_device(struct Scsi_Host
*host
, uint channel
,
1454 uint target
, uint lun
)
1456 struct scsi_device
*sdev
=
1457 __scsi_add_device(host
, channel
, target
, lun
, NULL
);
1459 return PTR_ERR(sdev
);
1461 scsi_device_put(sdev
);
1464 EXPORT_SYMBOL(scsi_add_device
);
1466 void scsi_rescan_device(struct device
*dev
)
1468 struct scsi_driver
*drv
;
1473 drv
= to_scsi_driver(dev
->driver
);
1474 if (try_module_get(drv
->owner
)) {
1477 module_put(drv
->owner
);
1480 EXPORT_SYMBOL(scsi_rescan_device
);
1482 static void __scsi_scan_target(struct device
*parent
, unsigned int channel
,
1483 unsigned int id
, unsigned int lun
, int rescan
)
1485 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1488 struct scsi_target
*starget
;
1490 if (shost
->this_id
== id
)
1492 * Don't scan the host adapter
1496 starget
= scsi_alloc_target(parent
, channel
, id
);
1500 if (lun
!= SCAN_WILD_CARD
) {
1502 * Scan for a specific host/chan/id/lun.
1504 scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
, NULL
);
1509 * Scan LUN 0, if there is some response, scan further. Ideally, we
1510 * would not configure LUN 0 until all LUNs are scanned.
1512 res
= scsi_probe_and_add_lun(starget
, 0, &bflags
, NULL
, rescan
, NULL
);
1513 if (res
== SCSI_SCAN_LUN_PRESENT
|| res
== SCSI_SCAN_TARGET_PRESENT
) {
1514 if (scsi_report_lun_scan(starget
, bflags
, rescan
) != 0)
1516 * The REPORT LUN did not scan the target,
1517 * do a sequential scan.
1519 scsi_sequential_lun_scan(starget
, bflags
,
1520 starget
->scsi_level
, rescan
);
1524 /* now determine if the target has any children at all
1525 * and if not, nuke it */
1526 scsi_target_reap(starget
);
1528 put_device(&starget
->dev
);
1532 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1534 * @parent: host to scan
1535 * @channel: channel to scan
1536 * @id: target id to scan
1537 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1538 * @rescan: passed to LUN scanning routines
1541 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1542 * and possibly all LUNs on the target id.
1544 * First try a REPORT LUN scan, if that does not scan the target, do a
1545 * sequential scan of LUNs on the target id.
1547 void scsi_scan_target(struct device
*parent
, unsigned int channel
,
1548 unsigned int id
, unsigned int lun
, int rescan
)
1550 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1552 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1555 if (!shost
->async_scan
)
1556 scsi_complete_async_scans();
1558 mutex_lock(&shost
->scan_mutex
);
1559 if (scsi_host_scan_allowed(shost
))
1560 __scsi_scan_target(parent
, channel
, id
, lun
, rescan
);
1561 mutex_unlock(&shost
->scan_mutex
);
1563 EXPORT_SYMBOL(scsi_scan_target
);
1565 static void scsi_scan_channel(struct Scsi_Host
*shost
, unsigned int channel
,
1566 unsigned int id
, unsigned int lun
, int rescan
)
1570 if (id
== SCAN_WILD_CARD
)
1571 for (id
= 0; id
< shost
->max_id
; ++id
) {
1573 * XXX adapter drivers when possible (FCP, iSCSI)
1574 * could modify max_id to match the current max,
1575 * not the absolute max.
1577 * XXX add a shost id iterator, so for example,
1578 * the FC ID can be the same as a target id
1579 * without a huge overhead of sparse id's.
1581 if (shost
->reverse_ordering
)
1583 * Scan from high to low id.
1585 order_id
= shost
->max_id
- id
- 1;
1588 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1589 order_id
, lun
, rescan
);
1592 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1596 int scsi_scan_host_selected(struct Scsi_Host
*shost
, unsigned int channel
,
1597 unsigned int id
, unsigned int lun
, int rescan
)
1599 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO
, shost
,
1601 __FUNCTION__
, channel
, id
, lun
));
1603 if (!shost
->async_scan
)
1604 scsi_complete_async_scans();
1606 if (((channel
!= SCAN_WILD_CARD
) && (channel
> shost
->max_channel
)) ||
1607 ((id
!= SCAN_WILD_CARD
) && (id
>= shost
->max_id
)) ||
1608 ((lun
!= SCAN_WILD_CARD
) && (lun
> shost
->max_lun
)))
1611 mutex_lock(&shost
->scan_mutex
);
1612 if (scsi_host_scan_allowed(shost
)) {
1613 if (channel
== SCAN_WILD_CARD
)
1614 for (channel
= 0; channel
<= shost
->max_channel
;
1616 scsi_scan_channel(shost
, channel
, id
, lun
,
1619 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1621 mutex_unlock(&shost
->scan_mutex
);
1626 static void scsi_sysfs_add_devices(struct Scsi_Host
*shost
)
1628 struct scsi_device
*sdev
;
1629 shost_for_each_device(sdev
, shost
) {
1630 if (scsi_sysfs_add_sdev(sdev
) != 0)
1631 scsi_destroy_sdev(sdev
);
1636 * scsi_prep_async_scan - prepare for an async scan
1637 * @shost: the host which will be scanned
1638 * Returns: a cookie to be passed to scsi_finish_async_scan()
1640 * Tells the midlayer this host is going to do an asynchronous scan.
1641 * It reserves the host's position in the scanning list and ensures
1642 * that other asynchronous scans started after this one won't affect the
1643 * ordering of the discovered devices.
1645 static struct async_scan_data
*scsi_prep_async_scan(struct Scsi_Host
*shost
)
1647 struct async_scan_data
*data
;
1649 if (strncmp(scsi_scan_type
, "sync", 4) == 0)
1652 if (shost
->async_scan
) {
1653 printk("%s called twice for host %d", __FUNCTION__
,
1659 data
= kmalloc(sizeof(*data
), GFP_KERNEL
);
1662 data
->shost
= scsi_host_get(shost
);
1665 init_completion(&data
->prev_finished
);
1667 spin_lock(&async_scan_lock
);
1668 shost
->async_scan
= 1;
1669 if (list_empty(&scanning_hosts
))
1670 complete(&data
->prev_finished
);
1671 list_add_tail(&data
->list
, &scanning_hosts
);
1672 spin_unlock(&async_scan_lock
);
1682 * scsi_finish_async_scan - asynchronous scan has finished
1683 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1685 * All the devices currently attached to this host have been found.
1686 * This function announces all the devices it has found to the rest
1689 static void scsi_finish_async_scan(struct async_scan_data
*data
)
1691 struct Scsi_Host
*shost
;
1696 shost
= data
->shost
;
1697 if (!shost
->async_scan
) {
1698 printk("%s called twice for host %d", __FUNCTION__
,
1704 wait_for_completion(&data
->prev_finished
);
1706 scsi_sysfs_add_devices(shost
);
1708 spin_lock(&async_scan_lock
);
1709 shost
->async_scan
= 0;
1710 list_del(&data
->list
);
1711 if (!list_empty(&scanning_hosts
)) {
1712 struct async_scan_data
*next
= list_entry(scanning_hosts
.next
,
1713 struct async_scan_data
, list
);
1714 complete(&next
->prev_finished
);
1716 spin_unlock(&async_scan_lock
);
1718 scsi_host_put(shost
);
1722 static void do_scsi_scan_host(struct Scsi_Host
*shost
)
1724 if (shost
->hostt
->scan_finished
) {
1725 unsigned long start
= jiffies
;
1726 if (shost
->hostt
->scan_start
)
1727 shost
->hostt
->scan_start(shost
);
1729 while (!shost
->hostt
->scan_finished(shost
, jiffies
- start
))
1732 scsi_scan_host_selected(shost
, SCAN_WILD_CARD
, SCAN_WILD_CARD
,
1737 static int do_scan_async(void *_data
)
1739 struct async_scan_data
*data
= _data
;
1740 do_scsi_scan_host(data
->shost
);
1741 scsi_finish_async_scan(data
);
1746 * scsi_scan_host - scan the given adapter
1747 * @shost: adapter to scan
1749 void scsi_scan_host(struct Scsi_Host
*shost
)
1751 struct async_scan_data
*data
;
1753 if (strncmp(scsi_scan_type
, "none", 4) == 0)
1756 data
= scsi_prep_async_scan(shost
);
1758 do_scsi_scan_host(shost
);
1762 kthread_run(do_scan_async
, data
, "scsi_scan_%d", shost
->host_no
);
1764 EXPORT_SYMBOL(scsi_scan_host
);
1766 void scsi_forget_host(struct Scsi_Host
*shost
)
1768 struct scsi_device
*sdev
;
1769 unsigned long flags
;
1772 spin_lock_irqsave(shost
->host_lock
, flags
);
1773 list_for_each_entry(sdev
, &shost
->__devices
, siblings
) {
1774 if (sdev
->sdev_state
== SDEV_DEL
)
1776 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1777 __scsi_remove_device(sdev
);
1780 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1784 * Function: scsi_get_host_dev()
1786 * Purpose: Create a scsi_device that points to the host adapter itself.
1788 * Arguments: SHpnt - Host that needs a scsi_device
1790 * Lock status: None assumed.
1792 * Returns: The scsi_device or NULL
1795 * Attach a single scsi_device to the Scsi_Host - this should
1796 * be made to look like a "pseudo-device" that points to the
1799 * Note - this device is not accessible from any high-level
1800 * drivers (including generics), which is probably not
1801 * optimal. We can add hooks later to attach
1803 struct scsi_device
*scsi_get_host_dev(struct Scsi_Host
*shost
)
1805 struct scsi_device
*sdev
= NULL
;
1806 struct scsi_target
*starget
;
1808 mutex_lock(&shost
->scan_mutex
);
1809 if (!scsi_host_scan_allowed(shost
))
1811 starget
= scsi_alloc_target(&shost
->shost_gendev
, 0, shost
->this_id
);
1815 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1817 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
1820 scsi_target_reap(starget
);
1821 put_device(&starget
->dev
);
1823 mutex_unlock(&shost
->scan_mutex
);
1826 EXPORT_SYMBOL(scsi_get_host_dev
);
1829 * Function: scsi_free_host_dev()
1831 * Purpose: Free a scsi_device that points to the host adapter itself.
1833 * Arguments: SHpnt - Host that needs a scsi_device
1835 * Lock status: None assumed.
1841 void scsi_free_host_dev(struct scsi_device
*sdev
)
1843 BUG_ON(sdev
->id
!= sdev
->host
->this_id
);
1845 scsi_destroy_sdev(sdev
);
1847 EXPORT_SYMBOL(scsi_free_host_dev
);