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/config.h>
29 #include <linux/module.h>
30 #include <linux/moduleparam.h>
31 #include <linux/init.h>
32 #include <linux/blkdev.h>
33 #include <asm/semaphore.h>
35 #include <scsi/scsi.h>
36 #include <scsi/scsi_device.h>
37 #include <scsi/scsi_driver.h>
38 #include <scsi/scsi_devinfo.h>
39 #include <scsi/scsi_host.h>
40 #include <scsi/scsi_request.h>
41 #include <scsi/scsi_transport.h>
42 #include <scsi/scsi_eh.h>
44 #include "scsi_priv.h"
45 #include "scsi_logging.h"
47 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
48 " SCSI scanning, some SCSI devices might not be configured\n"
53 #define SCSI_TIMEOUT (2*HZ)
56 * Prefix values for the SCSI id's (stored in driverfs name field)
58 #define SCSI_UID_SER_NUM 'S'
59 #define SCSI_UID_UNKNOWN 'Z'
62 * Return values of some of the scanning functions.
64 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
65 * includes allocation or general failures preventing IO from being sent.
67 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
70 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
73 #define SCSI_SCAN_NO_RESPONSE 0
74 #define SCSI_SCAN_TARGET_PRESENT 1
75 #define SCSI_SCAN_LUN_PRESENT 2
77 static const char *scsi_null_device_strs
= "nullnullnullnull";
79 #define MAX_SCSI_LUNS 512
81 #ifdef CONFIG_SCSI_MULTI_LUN
82 static unsigned int max_scsi_luns
= MAX_SCSI_LUNS
;
84 static unsigned int max_scsi_luns
= 1;
87 module_param_named(max_luns
, max_scsi_luns
, int, S_IRUGO
|S_IWUSR
);
88 MODULE_PARM_DESC(max_luns
,
89 "last scsi LUN (should be between 1 and 2^32-1)");
92 * max_scsi_report_luns: the maximum number of LUNS that will be
93 * returned from the REPORT LUNS command. 8 times this value must
94 * be allocated. In theory this could be up to an 8 byte value, but
95 * in practice, the maximum number of LUNs suppored by any device
98 static unsigned int max_scsi_report_luns
= 511;
100 module_param_named(max_report_luns
, max_scsi_report_luns
, int, S_IRUGO
|S_IWUSR
);
101 MODULE_PARM_DESC(max_report_luns
,
102 "REPORT LUNS maximum number of LUNS received (should be"
103 " between 1 and 16384)");
105 static unsigned int scsi_inq_timeout
= SCSI_TIMEOUT
/HZ
+3;
107 module_param_named(inq_timeout
, scsi_inq_timeout
, int, S_IRUGO
|S_IWUSR
);
108 MODULE_PARM_DESC(inq_timeout
,
109 "Timeout (in seconds) waiting for devices to answer INQUIRY."
110 " Default is 5. Some non-compliant devices need more.");
113 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
114 * @sdev: scsi device to send command to
115 * @result: area to store the result of the MODE SENSE
118 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
119 * Called for BLIST_KEY devices.
121 static void scsi_unlock_floptical(struct scsi_device
*sdev
,
122 unsigned char *result
)
124 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
126 printk(KERN_NOTICE
"scsi: unlocking floptical drive\n");
127 scsi_cmd
[0] = MODE_SENSE
;
131 scsi_cmd
[4] = 0x2a; /* size */
133 scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
, result
, 0x2a, NULL
,
138 * print_inquiry - printk the inquiry information
139 * @inq_result: printk this SCSI INQUIRY
142 * printk the vendor, model, and other information found in the
143 * INQUIRY data in @inq_result.
146 * Remove this, and replace with a hotplug event that logs any
147 * relevant information.
149 static void print_inquiry(unsigned char *inq_result
)
153 printk(KERN_NOTICE
" Vendor: ");
154 for (i
= 8; i
< 16; i
++)
155 if (inq_result
[i
] >= 0x20 && i
< inq_result
[4] + 5)
156 printk("%c", inq_result
[i
]);
161 for (i
= 16; i
< 32; i
++)
162 if (inq_result
[i
] >= 0x20 && i
< inq_result
[4] + 5)
163 printk("%c", inq_result
[i
]);
168 for (i
= 32; i
< 36; i
++)
169 if (inq_result
[i
] >= 0x20 && i
< inq_result
[4] + 5)
170 printk("%c", inq_result
[i
]);
176 i
= inq_result
[0] & 0x1f;
178 printk(KERN_NOTICE
" Type: %s ",
180 MAX_SCSI_DEVICE_CODE
? scsi_device_types
[i
] :
182 printk(" ANSI SCSI revision: %02x",
183 inq_result
[2] & 0x07);
184 if ((inq_result
[2] & 0x07) == 1 && (inq_result
[3] & 0x0f) == 1)
191 * scsi_alloc_sdev - allocate and setup a scsi_Device
194 * Allocate, initialize for io, and return a pointer to a scsi_Device.
195 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
196 * adds scsi_Device to the appropriate list.
199 * scsi_Device pointer, or NULL on failure.
201 static struct scsi_device
*scsi_alloc_sdev(struct scsi_target
*starget
,
202 unsigned int lun
, void *hostdata
)
204 struct scsi_device
*sdev
;
205 int display_failure_msg
= 1, ret
;
206 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
208 sdev
= kzalloc(sizeof(*sdev
) + shost
->transportt
->device_size
,
213 sdev
->vendor
= scsi_null_device_strs
;
214 sdev
->model
= scsi_null_device_strs
;
215 sdev
->rev
= scsi_null_device_strs
;
217 sdev
->id
= starget
->id
;
219 sdev
->channel
= starget
->channel
;
220 sdev
->sdev_state
= SDEV_CREATED
;
221 INIT_LIST_HEAD(&sdev
->siblings
);
222 INIT_LIST_HEAD(&sdev
->same_target_siblings
);
223 INIT_LIST_HEAD(&sdev
->cmd_list
);
224 INIT_LIST_HEAD(&sdev
->starved_entry
);
225 spin_lock_init(&sdev
->list_lock
);
227 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
228 sdev
->sdev_target
= starget
;
230 /* usually NULL and set by ->slave_alloc instead */
231 sdev
->hostdata
= hostdata
;
233 /* if the device needs this changing, it may do so in the
234 * slave_configure function */
235 sdev
->max_device_blocked
= SCSI_DEFAULT_DEVICE_BLOCKED
;
238 * Some low level driver could use device->type
243 * Assume that the device will have handshaking problems,
244 * and then fix this field later if it turns out it
249 sdev
->request_queue
= scsi_alloc_queue(sdev
);
250 if (!sdev
->request_queue
) {
251 /* release fn is set up in scsi_sysfs_device_initialise, so
252 * have to free and put manually here */
253 put_device(&starget
->dev
);
257 sdev
->request_queue
->queuedata
= sdev
;
258 scsi_adjust_queue_depth(sdev
, 0, sdev
->host
->cmd_per_lun
);
260 scsi_sysfs_device_initialize(sdev
);
262 if (shost
->hostt
->slave_alloc
) {
263 ret
= shost
->hostt
->slave_alloc(sdev
);
266 * if LLDD reports slave not present, don't clutter
267 * console with alloc failure messages
270 display_failure_msg
= 0;
271 goto out_device_destroy
;
278 transport_destroy_device(&sdev
->sdev_gendev
);
279 put_device(&sdev
->sdev_gendev
);
281 if (display_failure_msg
)
282 printk(ALLOC_FAILURE_MSG
, __FUNCTION__
);
286 static void scsi_target_dev_release(struct device
*dev
)
288 struct device
*parent
= dev
->parent
;
289 struct scsi_target
*starget
= to_scsi_target(dev
);
290 struct Scsi_Host
*shost
= dev_to_shost(parent
);
292 if (shost
->hostt
->target_destroy
)
293 shost
->hostt
->target_destroy(starget
);
298 int scsi_is_target_device(const struct device
*dev
)
300 return dev
->release
== scsi_target_dev_release
;
302 EXPORT_SYMBOL(scsi_is_target_device
);
304 static struct scsi_target
*__scsi_find_target(struct device
*parent
,
305 int channel
, uint id
)
307 struct scsi_target
*starget
, *found_starget
= NULL
;
308 struct Scsi_Host
*shost
= dev_to_shost(parent
);
310 * Search for an existing target for this sdev.
312 list_for_each_entry(starget
, &shost
->__targets
, siblings
) {
313 if (starget
->id
== id
&&
314 starget
->channel
== channel
) {
315 found_starget
= starget
;
320 get_device(&found_starget
->dev
);
322 return found_starget
;
325 static struct scsi_target
*scsi_alloc_target(struct device
*parent
,
326 int channel
, uint id
)
328 struct Scsi_Host
*shost
= dev_to_shost(parent
);
329 struct device
*dev
= NULL
;
331 const int size
= sizeof(struct scsi_target
)
332 + shost
->transportt
->target_size
;
333 struct scsi_target
*starget
;
334 struct scsi_target
*found_target
;
337 starget
= kzalloc(size
, GFP_KERNEL
);
339 printk(KERN_ERR
"%s: allocation failure\n", __FUNCTION__
);
343 device_initialize(dev
);
344 starget
->reap_ref
= 1;
345 dev
->parent
= get_device(parent
);
346 dev
->release
= scsi_target_dev_release
;
347 sprintf(dev
->bus_id
, "target%d:%d:%d",
348 shost
->host_no
, channel
, id
);
350 starget
->channel
= channel
;
351 INIT_LIST_HEAD(&starget
->siblings
);
352 INIT_LIST_HEAD(&starget
->devices
);
353 starget
->state
= STARGET_RUNNING
;
355 spin_lock_irqsave(shost
->host_lock
, flags
);
357 found_target
= __scsi_find_target(parent
, channel
, id
);
361 list_add_tail(&starget
->siblings
, &shost
->__targets
);
362 spin_unlock_irqrestore(shost
->host_lock
, flags
);
363 /* allocate and add */
364 transport_setup_device(dev
);
365 error
= device_add(dev
);
367 dev_err(dev
, "target device_add failed, error %d\n", error
);
368 spin_lock_irqsave(shost
->host_lock
, flags
);
369 list_del_init(&starget
->siblings
);
370 spin_unlock_irqrestore(shost
->host_lock
, flags
);
371 transport_destroy_device(dev
);
376 transport_add_device(dev
);
377 if (shost
->hostt
->target_alloc
) {
378 error
= shost
->hostt
->target_alloc(starget
);
381 dev_printk(KERN_ERR
, dev
, "target allocation failed, error %d\n", error
);
382 /* don't want scsi_target_reap to do the final
383 * put because it will be under the host lock */
385 scsi_target_reap(starget
);
394 found_target
->reap_ref
++;
395 spin_unlock_irqrestore(shost
->host_lock
, flags
);
397 if (found_target
->state
!= STARGET_DEL
) {
401 /* Unfortunately, we found a dying target; need to
402 * wait until it's dead before we can get a new one */
403 put_device(&found_target
->dev
);
404 flush_scheduled_work();
408 static void scsi_target_reap_usercontext(void *data
)
410 struct scsi_target
*starget
= data
;
411 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
414 transport_remove_device(&starget
->dev
);
415 device_del(&starget
->dev
);
416 transport_destroy_device(&starget
->dev
);
417 spin_lock_irqsave(shost
->host_lock
, flags
);
418 list_del_init(&starget
->siblings
);
419 spin_unlock_irqrestore(shost
->host_lock
, flags
);
420 put_device(&starget
->dev
);
424 * scsi_target_reap - check to see if target is in use and destroy if not
426 * @starget: target to be checked
428 * This is used after removing a LUN or doing a last put of the target
429 * it checks atomically that nothing is using the target and removes
432 void scsi_target_reap(struct scsi_target
*starget
)
434 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
437 spin_lock_irqsave(shost
->host_lock
, flags
);
439 if (--starget
->reap_ref
== 0 && list_empty(&starget
->devices
)) {
440 BUG_ON(starget
->state
== STARGET_DEL
);
441 starget
->state
= STARGET_DEL
;
442 spin_unlock_irqrestore(shost
->host_lock
, flags
);
443 execute_in_process_context(scsi_target_reap_usercontext
,
444 starget
, &starget
->ew
);
448 spin_unlock_irqrestore(shost
->host_lock
, flags
);
454 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
455 * @sdev: scsi_device to probe
456 * @inq_result: area to store the INQUIRY result
457 * @result_len: len of inq_result
458 * @bflags: store any bflags found here
461 * Probe the lun associated with @req using a standard SCSI INQUIRY;
463 * If the INQUIRY is successful, zero is returned and the
464 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
465 * are copied to the scsi_device any flags value is stored in *@bflags.
467 static int scsi_probe_lun(struct scsi_device
*sdev
, char *inq_result
,
468 int result_len
, int *bflags
)
470 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
471 int first_inquiry_len
, try_inquiry_len
, next_inquiry_len
;
472 int response_len
= 0;
473 int pass
, count
, result
;
474 struct scsi_sense_hdr sshdr
;
478 /* Perform up to 3 passes. The first pass uses a conservative
479 * transfer length of 36 unless sdev->inquiry_len specifies a
480 * different value. */
481 first_inquiry_len
= sdev
->inquiry_len
? sdev
->inquiry_len
: 36;
482 try_inquiry_len
= first_inquiry_len
;
486 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
487 "scsi scan: INQUIRY pass %d length %d\n",
488 pass
, try_inquiry_len
));
490 /* Each pass gets up to three chances to ignore Unit Attention */
491 for (count
= 0; count
< 3; ++count
) {
492 memset(scsi_cmd
, 0, 6);
493 scsi_cmd
[0] = INQUIRY
;
494 scsi_cmd
[4] = (unsigned char) try_inquiry_len
;
496 memset(inq_result
, 0, try_inquiry_len
);
498 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
499 inq_result
, try_inquiry_len
, &sshdr
,
500 HZ
/ 2 + HZ
* scsi_inq_timeout
, 3);
502 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: INQUIRY %s "
504 result
? "failed" : "successful", result
));
508 * not-ready to ready transition [asc/ascq=0x28/0x0]
509 * or power-on, reset [asc/ascq=0x29/0x0], continue.
510 * INQUIRY should not yield UNIT_ATTENTION
511 * but many buggy devices do so anyway.
513 if ((driver_byte(result
) & DRIVER_SENSE
) &&
514 scsi_sense_valid(&sshdr
)) {
515 if ((sshdr
.sense_key
== UNIT_ATTENTION
) &&
516 ((sshdr
.asc
== 0x28) ||
517 (sshdr
.asc
== 0x29)) &&
526 response_len
= (unsigned char) inq_result
[4] + 5;
527 if (response_len
> 255)
528 response_len
= first_inquiry_len
; /* sanity */
531 * Get any flags for this device.
533 * XXX add a bflags to scsi_device, and replace the
534 * corresponding bit fields in scsi_device, so bflags
535 * need not be passed as an argument.
537 *bflags
= scsi_get_device_flags(sdev
, &inq_result
[8],
540 /* When the first pass succeeds we gain information about
541 * what larger transfer lengths might work. */
543 if (BLIST_INQUIRY_36
& *bflags
)
544 next_inquiry_len
= 36;
545 else if (BLIST_INQUIRY_58
& *bflags
)
546 next_inquiry_len
= 58;
547 else if (sdev
->inquiry_len
)
548 next_inquiry_len
= sdev
->inquiry_len
;
550 next_inquiry_len
= response_len
;
552 /* If more data is available perform the second pass */
553 if (next_inquiry_len
> try_inquiry_len
) {
554 try_inquiry_len
= next_inquiry_len
;
560 } else if (pass
== 2) {
561 printk(KERN_INFO
"scsi scan: %d byte inquiry failed. "
562 "Consider BLIST_INQUIRY_36 for this device\n",
565 /* If this pass failed, the third pass goes back and transfers
566 * the same amount as we successfully got in the first pass. */
567 try_inquiry_len
= first_inquiry_len
;
572 /* If the last transfer attempt got an error, assume the
573 * peripheral doesn't exist or is dead. */
577 /* Don't report any more data than the device says is valid */
578 sdev
->inquiry_len
= min(try_inquiry_len
, response_len
);
581 * XXX Abort if the response length is less than 36? If less than
582 * 32, the lookup of the device flags (above) could be invalid,
583 * and it would be possible to take an incorrect action - we do
584 * not want to hang because of a short INQUIRY. On the flip side,
585 * if the device is spun down or becoming ready (and so it gives a
586 * short INQUIRY), an abort here prevents any further use of the
587 * device, including spin up.
589 * Related to the above issue:
591 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
592 * and if not ready, sent a START_STOP to start (maybe spin up) and
593 * then send the INQUIRY again, since the INQUIRY can change after
594 * a device is initialized.
596 * Ideally, start a device if explicitly asked to do so. This
597 * assumes that a device is spun up on power on, spun down on
598 * request, and then spun up on request.
602 * The scanning code needs to know the scsi_level, even if no
603 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
604 * non-zero LUNs can be scanned.
606 sdev
->scsi_level
= inq_result
[2] & 0x07;
607 if (sdev
->scsi_level
>= 2 ||
608 (sdev
->scsi_level
== 1 && (inq_result
[3] & 0x0f) == 1))
610 sdev
->sdev_target
->scsi_level
= sdev
->scsi_level
;
616 * scsi_add_lun - allocate and fully initialze a scsi_device
617 * @sdevscan: holds information to be stored in the new scsi_device
618 * @sdevnew: store the address of the newly allocated scsi_device
619 * @inq_result: holds the result of a previous INQUIRY to the LUN
620 * @bflags: black/white list flag
623 * Allocate and initialize a scsi_device matching sdevscan. Optionally
624 * set fields based on values in *@bflags. If @sdevnew is not
625 * NULL, store the address of the new scsi_device in *@sdevnew (needed
626 * when scanning a particular LUN).
629 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
630 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
632 static int scsi_add_lun(struct scsi_device
*sdev
, char *inq_result
, int *bflags
)
635 * XXX do not save the inquiry, since it can change underneath us,
636 * save just vendor/model/rev.
638 * Rather than save it and have an ioctl that retrieves the saved
639 * value, have an ioctl that executes the same INQUIRY code used
640 * in scsi_probe_lun, let user level programs doing INQUIRY
641 * scanning run at their own risk, or supply a user level program
642 * that can correctly scan.
644 sdev
->inquiry
= kmalloc(sdev
->inquiry_len
, GFP_ATOMIC
);
645 if (sdev
->inquiry
== NULL
) {
646 return SCSI_SCAN_NO_RESPONSE
;
649 memcpy(sdev
->inquiry
, inq_result
, sdev
->inquiry_len
);
650 sdev
->vendor
= (char *) (sdev
->inquiry
+ 8);
651 sdev
->model
= (char *) (sdev
->inquiry
+ 16);
652 sdev
->rev
= (char *) (sdev
->inquiry
+ 32);
654 if (*bflags
& BLIST_ISROM
) {
656 * It would be better to modify sdev->type, and set
657 * sdev->removable, but then the print_inquiry() output
658 * would not show TYPE_ROM; if print_inquiry() is removed
659 * the issue goes away.
661 inq_result
[0] = TYPE_ROM
;
662 inq_result
[1] |= 0x80; /* removable */
663 } else if (*bflags
& BLIST_NO_ULD_ATTACH
)
664 sdev
->no_uld_attach
= 1;
666 switch (sdev
->type
= (inq_result
[0] & 0x1f)) {
673 case TYPE_MEDIUM_CHANGER
:
684 printk(KERN_INFO
"scsi: unknown device type %d\n", sdev
->type
);
687 print_inquiry(inq_result
);
690 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
691 * spec says: The device server is capable of supporting the
692 * specified peripheral device type on this logical unit. However,
693 * the physical device is not currently connected to this logical
696 * The above is vague, as it implies that we could treat 001 and
697 * 011 the same. Stay compatible with previous code, and create a
698 * scsi_device for a PQ of 1
700 * Don't set the device offline here; rather let the upper
701 * level drivers eval the PQ to decide whether they should
702 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
705 sdev
->inq_periph_qual
= (inq_result
[0] >> 5) & 7;
706 sdev
->removable
= (0x80 & inq_result
[1]) >> 7;
707 sdev
->lockable
= sdev
->removable
;
708 sdev
->soft_reset
= (inq_result
[7] & 1) && ((inq_result
[3] & 7) == 2);
710 if (sdev
->scsi_level
>= SCSI_3
|| (sdev
->inquiry_len
> 56 &&
711 inq_result
[56] & 0x04))
713 if (inq_result
[7] & 0x60)
715 if (inq_result
[7] & 0x10)
722 if ((sdev
->scsi_level
>= SCSI_2
) && (inq_result
[7] & 2) &&
723 !(*bflags
& BLIST_NOTQ
))
724 sdev
->tagged_supported
= 1;
726 * Some devices (Texel CD ROM drives) have handshaking problems
727 * when used with the Seagate controllers. borken is initialized
728 * to 1, and then set it to 0 here.
730 if ((*bflags
& BLIST_BORKEN
) == 0)
734 * Apparently some really broken devices (contrary to the SCSI
735 * standards) need to be selected without asserting ATN
737 if (*bflags
& BLIST_SELECT_NO_ATN
)
738 sdev
->select_no_atn
= 1;
741 * Some devices may not want to have a start command automatically
742 * issued when a device is added.
744 if (*bflags
& BLIST_NOSTARTONADD
)
745 sdev
->no_start_on_add
= 1;
747 if (*bflags
& BLIST_SINGLELUN
)
748 sdev
->single_lun
= 1;
751 sdev
->use_10_for_rw
= 1;
753 if (*bflags
& BLIST_MS_SKIP_PAGE_08
)
754 sdev
->skip_ms_page_8
= 1;
756 if (*bflags
& BLIST_MS_SKIP_PAGE_3F
)
757 sdev
->skip_ms_page_3f
= 1;
759 if (*bflags
& BLIST_USE_10_BYTE_MS
)
760 sdev
->use_10_for_ms
= 1;
762 /* set the device running here so that slave configure
764 scsi_device_set_state(sdev
, SDEV_RUNNING
);
766 if (*bflags
& BLIST_MS_192_BYTES_FOR_3F
)
767 sdev
->use_192_bytes_for_3f
= 1;
769 if (*bflags
& BLIST_NOT_LOCKABLE
)
772 if (*bflags
& BLIST_RETRY_HWERROR
)
773 sdev
->retry_hwerror
= 1;
775 transport_configure_device(&sdev
->sdev_gendev
);
777 if (sdev
->host
->hostt
->slave_configure
)
778 sdev
->host
->hostt
->slave_configure(sdev
);
781 * Ok, the device is now all set up, we can
782 * register it and tell the rest of the kernel
785 if (scsi_sysfs_add_sdev(sdev
) != 0)
786 return SCSI_SCAN_NO_RESPONSE
;
788 return SCSI_SCAN_LUN_PRESENT
;
791 static inline void scsi_destroy_sdev(struct scsi_device
*sdev
)
793 if (sdev
->host
->hostt
->slave_destroy
)
794 sdev
->host
->hostt
->slave_destroy(sdev
);
795 transport_destroy_device(&sdev
->sdev_gendev
);
796 put_device(&sdev
->sdev_gendev
);
801 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
802 * @starget: pointer to target device structure
803 * @lun: LUN of target device
804 * @sdevscan: probe the LUN corresponding to this scsi_device
805 * @sdevnew: store the value of any new scsi_device allocated
806 * @bflagsp: store bflags here if not NULL
809 * Call scsi_probe_lun, if a LUN with an attached device is found,
810 * allocate and set it up by calling scsi_add_lun.
813 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
814 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
815 * attached at the LUN
816 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
818 static int scsi_probe_and_add_lun(struct scsi_target
*starget
,
819 uint lun
, int *bflagsp
,
820 struct scsi_device
**sdevp
, int rescan
,
823 struct scsi_device
*sdev
;
824 unsigned char *result
;
825 int bflags
, res
= SCSI_SCAN_NO_RESPONSE
, result_len
= 256;
826 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
829 * The rescan flag is used as an optimization, the first scan of a
830 * host adapter calls into here with rescan == 0.
832 sdev
= scsi_device_lookup_by_target(starget
, lun
);
834 if (rescan
|| sdev
->sdev_state
!= SDEV_CREATED
) {
835 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
836 "scsi scan: device exists on %s\n",
837 sdev
->sdev_gendev
.bus_id
));
841 scsi_device_put(sdev
);
844 *bflagsp
= scsi_get_device_flags(sdev
,
847 return SCSI_SCAN_LUN_PRESENT
;
849 scsi_device_put(sdev
);
851 sdev
= scsi_alloc_sdev(starget
, lun
, hostdata
);
855 result
= kmalloc(result_len
, GFP_ATOMIC
|
856 ((shost
->unchecked_isa_dma
) ? __GFP_DMA
: 0));
860 if (scsi_probe_lun(sdev
, result
, result_len
, &bflags
))
861 goto out_free_result
;
864 * result contains valid SCSI INQUIRY data.
866 if ((result
[0] >> 5) == 3) {
868 * For a Peripheral qualifier 3 (011b), the SCSI
869 * spec says: The device server is not capable of
870 * supporting a physical device on this logical
873 * For disks, this implies that there is no
874 * logical disk configured at sdev->lun, but there
875 * is a target id responding.
877 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
878 "scsi scan: peripheral qualifier of 3,"
879 " no device added\n"));
880 res
= SCSI_SCAN_TARGET_PRESENT
;
881 goto out_free_result
;
885 * Non-standard SCSI targets may set the PDT to 0x1f (unknown or
886 * no device type) instead of using the Peripheral Qualifier to
887 * indicate that no LUN is present. For example, USB UFI does this.
889 if (starget
->pdt_1f_for_no_lun
&& (result
[0] & 0x1f) == 0x1f) {
890 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
891 "scsi scan: peripheral device type"
892 " of 31, no device added\n"));
893 res
= SCSI_SCAN_TARGET_PRESENT
;
894 goto out_free_result
;
897 res
= scsi_add_lun(sdev
, result
, &bflags
);
898 if (res
== SCSI_SCAN_LUN_PRESENT
) {
899 if (bflags
& BLIST_KEY
) {
901 scsi_unlock_floptical(sdev
, result
);
910 if (res
== SCSI_SCAN_LUN_PRESENT
) {
912 if (scsi_device_get(sdev
) == 0) {
915 __scsi_remove_device(sdev
);
916 res
= SCSI_SCAN_NO_RESPONSE
;
920 scsi_destroy_sdev(sdev
);
926 * scsi_sequential_lun_scan - sequentially scan a SCSI target
927 * @starget: pointer to target structure to scan
928 * @bflags: black/white list flag for LUN 0
929 * @lun0_res: result of scanning LUN 0
932 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
933 * scanned) to some maximum lun until a LUN is found with no device
934 * attached. Use the bflags to figure out any oddities.
936 * Modifies sdevscan->lun.
938 static void scsi_sequential_lun_scan(struct scsi_target
*starget
,
939 int bflags
, int lun0_res
, int scsi_level
,
942 unsigned int sparse_lun
, lun
, max_dev_lun
;
943 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
945 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: Sequential scan of"
946 "%s\n", starget
->dev
.bus_id
));
948 max_dev_lun
= min(max_scsi_luns
, shost
->max_lun
);
950 * If this device is known to support sparse multiple units,
951 * override the other settings, and scan all of them. Normally,
952 * SCSI-3 devices should be scanned via the REPORT LUNS.
954 if (bflags
& BLIST_SPARSELUN
) {
955 max_dev_lun
= shost
->max_lun
;
961 * If not sparse lun and no device attached at LUN 0 do not scan
964 if (!sparse_lun
&& (lun0_res
!= SCSI_SCAN_LUN_PRESENT
))
968 * If less than SCSI_1_CSS, and no special lun scaning, stop
969 * scanning; this matches 2.4 behaviour, but could just be a bug
970 * (to continue scanning a SCSI_1_CSS device).
972 * This test is broken. We might not have any device on lun0 for
973 * a sparselun device, and if that's the case then how would we
974 * know the real scsi_level, eh? It might make sense to just not
975 * scan any SCSI_1 device for non-0 luns, but that check would best
976 * go into scsi_alloc_sdev() and just have it return null when asked
977 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
979 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
980 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
985 * If this device is known to support multiple units, override
986 * the other settings, and scan all of them.
988 if (bflags
& BLIST_FORCELUN
)
989 max_dev_lun
= shost
->max_lun
;
991 * REGAL CDC-4X: avoid hang after LUN 4
993 if (bflags
& BLIST_MAX5LUN
)
994 max_dev_lun
= min(5U, max_dev_lun
);
996 * Do not scan SCSI-2 or lower device past LUN 7, unless
999 if (scsi_level
< SCSI_3
&& !(bflags
& BLIST_LARGELUN
))
1000 max_dev_lun
= min(8U, max_dev_lun
);
1003 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1004 * until we reach the max, or no LUN is found and we are not
1007 for (lun
= 1; lun
< max_dev_lun
; ++lun
)
1008 if ((scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
,
1009 NULL
) != SCSI_SCAN_LUN_PRESENT
) &&
1015 * scsilun_to_int: convert a scsi_lun to an int
1016 * @scsilun: struct scsi_lun to be converted.
1019 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1020 * integer, and return the result. The caller must check for
1021 * truncation before using this function.
1024 * The struct scsi_lun is assumed to be four levels, with each level
1025 * effectively containing a SCSI byte-ordered (big endian) short; the
1026 * addressing bits of each level are ignored (the highest two bits).
1027 * For a description of the LUN format, post SCSI-3 see the SCSI
1028 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1030 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1031 * the integer: 0x0b030a04
1033 static int scsilun_to_int(struct scsi_lun
*scsilun
)
1039 for (i
= 0; i
< sizeof(lun
); i
+= 2)
1040 lun
= lun
| (((scsilun
->scsi_lun
[i
] << 8) |
1041 scsilun
->scsi_lun
[i
+ 1]) << (i
* 8));
1046 * int_to_scsilun: reverts an int into a scsi_lun
1047 * @int: integer to be reverted
1048 * @scsilun: struct scsi_lun to be set.
1051 * Reverts the functionality of the scsilun_to_int, which packed
1052 * an 8-byte lun value into an int. This routine unpacks the int
1053 * back into the lun value.
1054 * Note: the scsilun_to_int() routine does not truly handle all
1055 * 8bytes of the lun value. This functions restores only as much
1056 * as was set by the routine.
1059 * Given an integer : 0x0b030a04, this function returns a
1060 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1063 void int_to_scsilun(unsigned int lun
, struct scsi_lun
*scsilun
)
1067 memset(scsilun
->scsi_lun
, 0, sizeof(scsilun
->scsi_lun
));
1069 for (i
= 0; i
< sizeof(lun
); i
+= 2) {
1070 scsilun
->scsi_lun
[i
] = (lun
>> 8) & 0xFF;
1071 scsilun
->scsi_lun
[i
+1] = lun
& 0xFF;
1075 EXPORT_SYMBOL(int_to_scsilun
);
1078 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1079 * @sdevscan: scan the host, channel, and id of this scsi_device
1082 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1083 * command, and scan the resulting list of LUNs by calling
1084 * scsi_probe_and_add_lun.
1086 * Modifies sdevscan->lun.
1089 * 0: scan completed (or no memory, so further scanning is futile)
1090 * 1: no report lun scan, or not configured
1092 static int scsi_report_lun_scan(struct scsi_target
*starget
, int bflags
,
1096 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
1097 unsigned int length
;
1099 unsigned int num_luns
;
1100 unsigned int retries
;
1102 struct scsi_lun
*lunp
, *lun_data
;
1104 struct scsi_sense_hdr sshdr
;
1105 struct scsi_device
*sdev
;
1106 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
1110 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1111 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1112 * support more than 8 LUNs.
1114 if ((bflags
& BLIST_NOREPORTLUN
) ||
1115 starget
->scsi_level
< SCSI_2
||
1116 (starget
->scsi_level
< SCSI_3
&&
1117 (!(bflags
& BLIST_REPORTLUN2
) || shost
->max_lun
<= 8)) )
1119 if (bflags
& BLIST_NOLUN
)
1122 if (!(sdev
= scsi_device_lookup_by_target(starget
, 0))) {
1123 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1126 if (scsi_device_get(sdev
))
1130 sprintf(devname
, "host %d channel %d id %d",
1131 shost
->host_no
, sdev
->channel
, sdev
->id
);
1134 * Allocate enough to hold the header (the same size as one scsi_lun)
1135 * plus the max number of luns we are requesting.
1137 * Reallocating and trying again (with the exact amount we need)
1138 * would be nice, but then we need to somehow limit the size
1139 * allocated based on the available memory and the limits of
1140 * kmalloc - we don't want a kmalloc() failure of a huge value to
1141 * prevent us from finding any LUNs on this target.
1143 length
= (max_scsi_report_luns
+ 1) * sizeof(struct scsi_lun
);
1144 lun_data
= kmalloc(length
, GFP_ATOMIC
|
1145 (sdev
->host
->unchecked_isa_dma
? __GFP_DMA
: 0));
1147 printk(ALLOC_FAILURE_MSG
, __FUNCTION__
);
1151 scsi_cmd
[0] = REPORT_LUNS
;
1154 * bytes 1 - 5: reserved, set to zero.
1156 memset(&scsi_cmd
[1], 0, 5);
1159 * bytes 6 - 9: length of the command.
1161 scsi_cmd
[6] = (unsigned char) (length
>> 24) & 0xff;
1162 scsi_cmd
[7] = (unsigned char) (length
>> 16) & 0xff;
1163 scsi_cmd
[8] = (unsigned char) (length
>> 8) & 0xff;
1164 scsi_cmd
[9] = (unsigned char) length
& 0xff;
1166 scsi_cmd
[10] = 0; /* reserved */
1167 scsi_cmd
[11] = 0; /* control */
1170 * We can get a UNIT ATTENTION, for example a power on/reset, so
1171 * retry a few times (like sd.c does for TEST UNIT READY).
1172 * Experience shows some combinations of adapter/devices get at
1173 * least two power on/resets.
1175 * Illegal requests (for devices that do not support REPORT LUNS)
1176 * should come through as a check condition, and will not generate
1179 for (retries
= 0; retries
< 3; retries
++) {
1180 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: Sending"
1181 " REPORT LUNS to %s (try %d)\n", devname
,
1184 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
1185 lun_data
, length
, &sshdr
,
1186 SCSI_TIMEOUT
+ 4 * HZ
, 3);
1188 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: REPORT LUNS"
1189 " %s (try %d) result 0x%x\n", result
1190 ? "failed" : "successful", retries
, result
));
1193 else if (scsi_sense_valid(&sshdr
)) {
1194 if (sshdr
.sense_key
!= UNIT_ATTENTION
)
1201 * The device probably does not support a REPORT LUN command
1208 * Get the length from the first four bytes of lun_data.
1210 data
= (u8
*) lun_data
->scsi_lun
;
1211 length
= ((data
[0] << 24) | (data
[1] << 16) |
1212 (data
[2] << 8) | (data
[3] << 0));
1214 num_luns
= (length
/ sizeof(struct scsi_lun
));
1215 if (num_luns
> max_scsi_report_luns
) {
1216 printk(KERN_WARNING
"scsi: On %s only %d (max_scsi_report_luns)"
1217 " of %d luns reported, try increasing"
1218 " max_scsi_report_luns.\n", devname
,
1219 max_scsi_report_luns
, num_luns
);
1220 num_luns
= max_scsi_report_luns
;
1223 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1224 "scsi scan: REPORT LUN scan\n"));
1227 * Scan the luns in lun_data. The entry at offset 0 is really
1228 * the header, so start at 1 and go up to and including num_luns.
1230 for (lunp
= &lun_data
[1]; lunp
<= &lun_data
[num_luns
]; lunp
++) {
1231 lun
= scsilun_to_int(lunp
);
1234 * Check if the unused part of lunp is non-zero, and so
1235 * does not fit in lun.
1237 if (memcmp(&lunp
->scsi_lun
[sizeof(lun
)], "\0\0\0\0", 4)) {
1241 * Output an error displaying the LUN in byte order,
1242 * this differs from what linux would print for the
1243 * integer LUN value.
1245 printk(KERN_WARNING
"scsi: %s lun 0x", devname
);
1246 data
= (char *)lunp
->scsi_lun
;
1247 for (i
= 0; i
< sizeof(struct scsi_lun
); i
++)
1248 printk("%02x", data
[i
]);
1249 printk(" has a LUN larger than currently supported.\n");
1250 } else if (lun
> sdev
->host
->max_lun
) {
1251 printk(KERN_WARNING
"scsi: %s lun%d has a LUN larger"
1252 " than allowed by the host adapter\n",
1257 res
= scsi_probe_and_add_lun(starget
,
1258 lun
, NULL
, NULL
, rescan
, NULL
);
1259 if (res
== SCSI_SCAN_NO_RESPONSE
) {
1261 * Got some results, but now none, abort.
1263 sdev_printk(KERN_ERR
, sdev
,
1264 "Unexpected response"
1265 " from lun %d while scanning, scan"
1275 scsi_device_put(sdev
);
1276 if (sdev
->sdev_state
== SDEV_CREATED
)
1278 * the sdev we used didn't appear in the report luns scan
1280 scsi_destroy_sdev(sdev
);
1284 struct scsi_device
*__scsi_add_device(struct Scsi_Host
*shost
, uint channel
,
1285 uint id
, uint lun
, void *hostdata
)
1287 struct scsi_device
*sdev
= ERR_PTR(-ENODEV
);
1288 struct device
*parent
= &shost
->shost_gendev
;
1289 struct scsi_target
*starget
;
1291 starget
= scsi_alloc_target(parent
, channel
, id
);
1293 return ERR_PTR(-ENOMEM
);
1295 get_device(&starget
->dev
);
1296 mutex_lock(&shost
->scan_mutex
);
1297 if (scsi_host_scan_allowed(shost
))
1298 scsi_probe_and_add_lun(starget
, lun
, NULL
, &sdev
, 1, hostdata
);
1299 mutex_unlock(&shost
->scan_mutex
);
1300 scsi_target_reap(starget
);
1301 put_device(&starget
->dev
);
1305 EXPORT_SYMBOL(__scsi_add_device
);
1307 int scsi_add_device(struct Scsi_Host
*host
, uint channel
,
1308 uint target
, uint lun
)
1310 struct scsi_device
*sdev
=
1311 __scsi_add_device(host
, channel
, target
, lun
, NULL
);
1313 return PTR_ERR(sdev
);
1315 scsi_device_put(sdev
);
1318 EXPORT_SYMBOL(scsi_add_device
);
1320 void scsi_rescan_device(struct device
*dev
)
1322 struct scsi_driver
*drv
;
1327 drv
= to_scsi_driver(dev
->driver
);
1328 if (try_module_get(drv
->owner
)) {
1331 module_put(drv
->owner
);
1334 EXPORT_SYMBOL(scsi_rescan_device
);
1336 static void __scsi_scan_target(struct device
*parent
, unsigned int channel
,
1337 unsigned int id
, unsigned int lun
, int rescan
)
1339 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1342 struct scsi_target
*starget
;
1344 if (shost
->this_id
== id
)
1346 * Don't scan the host adapter
1350 starget
= scsi_alloc_target(parent
, channel
, id
);
1354 get_device(&starget
->dev
);
1355 if (lun
!= SCAN_WILD_CARD
) {
1357 * Scan for a specific host/chan/id/lun.
1359 scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
, NULL
);
1364 * Scan LUN 0, if there is some response, scan further. Ideally, we
1365 * would not configure LUN 0 until all LUNs are scanned.
1367 res
= scsi_probe_and_add_lun(starget
, 0, &bflags
, NULL
, rescan
, NULL
);
1368 if (res
== SCSI_SCAN_LUN_PRESENT
|| res
== SCSI_SCAN_TARGET_PRESENT
) {
1369 if (scsi_report_lun_scan(starget
, bflags
, rescan
) != 0)
1371 * The REPORT LUN did not scan the target,
1372 * do a sequential scan.
1374 scsi_sequential_lun_scan(starget
, bflags
,
1375 res
, starget
->scsi_level
, rescan
);
1379 /* now determine if the target has any children at all
1380 * and if not, nuke it */
1381 scsi_target_reap(starget
);
1383 put_device(&starget
->dev
);
1387 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1389 * @parent: host to scan
1390 * @channel: channel to scan
1391 * @id: target id to scan
1392 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1393 * @rescan: passed to LUN scanning routines
1396 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1397 * and possibly all LUNs on the target id.
1399 * First try a REPORT LUN scan, if that does not scan the target, do a
1400 * sequential scan of LUNs on the target id.
1402 void scsi_scan_target(struct device
*parent
, unsigned int channel
,
1403 unsigned int id
, unsigned int lun
, int rescan
)
1405 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1407 mutex_lock(&shost
->scan_mutex
);
1408 if (scsi_host_scan_allowed(shost
))
1409 __scsi_scan_target(parent
, channel
, id
, lun
, rescan
);
1410 mutex_unlock(&shost
->scan_mutex
);
1412 EXPORT_SYMBOL(scsi_scan_target
);
1414 static void scsi_scan_channel(struct Scsi_Host
*shost
, unsigned int channel
,
1415 unsigned int id
, unsigned int lun
, int rescan
)
1419 if (id
== SCAN_WILD_CARD
)
1420 for (id
= 0; id
< shost
->max_id
; ++id
) {
1422 * XXX adapter drivers when possible (FCP, iSCSI)
1423 * could modify max_id to match the current max,
1424 * not the absolute max.
1426 * XXX add a shost id iterator, so for example,
1427 * the FC ID can be the same as a target id
1428 * without a huge overhead of sparse id's.
1430 if (shost
->reverse_ordering
)
1432 * Scan from high to low id.
1434 order_id
= shost
->max_id
- id
- 1;
1437 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1438 order_id
, lun
, rescan
);
1441 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1445 int scsi_scan_host_selected(struct Scsi_Host
*shost
, unsigned int channel
,
1446 unsigned int id
, unsigned int lun
, int rescan
)
1448 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO
, shost
,
1450 __FUNCTION__
, channel
, id
, lun
));
1452 if (((channel
!= SCAN_WILD_CARD
) && (channel
> shost
->max_channel
)) ||
1453 ((id
!= SCAN_WILD_CARD
) && (id
> shost
->max_id
)) ||
1454 ((lun
!= SCAN_WILD_CARD
) && (lun
> shost
->max_lun
)))
1457 mutex_lock(&shost
->scan_mutex
);
1458 if (scsi_host_scan_allowed(shost
)) {
1459 if (channel
== SCAN_WILD_CARD
)
1460 for (channel
= 0; channel
<= shost
->max_channel
;
1462 scsi_scan_channel(shost
, channel
, id
, lun
,
1465 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1467 mutex_unlock(&shost
->scan_mutex
);
1473 * scsi_scan_host - scan the given adapter
1474 * @shost: adapter to scan
1476 void scsi_scan_host(struct Scsi_Host
*shost
)
1478 scsi_scan_host_selected(shost
, SCAN_WILD_CARD
, SCAN_WILD_CARD
,
1481 EXPORT_SYMBOL(scsi_scan_host
);
1483 void scsi_forget_host(struct Scsi_Host
*shost
)
1485 struct scsi_device
*sdev
;
1486 unsigned long flags
;
1489 spin_lock_irqsave(shost
->host_lock
, flags
);
1490 list_for_each_entry(sdev
, &shost
->__devices
, siblings
) {
1491 if (sdev
->sdev_state
== SDEV_DEL
)
1493 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1494 __scsi_remove_device(sdev
);
1497 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1501 * Function: scsi_get_host_dev()
1503 * Purpose: Create a scsi_device that points to the host adapter itself.
1505 * Arguments: SHpnt - Host that needs a scsi_device
1507 * Lock status: None assumed.
1509 * Returns: The scsi_device or NULL
1512 * Attach a single scsi_device to the Scsi_Host - this should
1513 * be made to look like a "pseudo-device" that points to the
1516 * Note - this device is not accessible from any high-level
1517 * drivers (including generics), which is probably not
1518 * optimal. We can add hooks later to attach
1520 struct scsi_device
*scsi_get_host_dev(struct Scsi_Host
*shost
)
1522 struct scsi_device
*sdev
= NULL
;
1523 struct scsi_target
*starget
;
1525 mutex_lock(&shost
->scan_mutex
);
1526 if (!scsi_host_scan_allowed(shost
))
1528 starget
= scsi_alloc_target(&shost
->shost_gendev
, 0, shost
->this_id
);
1532 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1534 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
1537 put_device(&starget
->dev
);
1539 mutex_unlock(&shost
->scan_mutex
);
1542 EXPORT_SYMBOL(scsi_get_host_dev
);
1545 * Function: scsi_free_host_dev()
1547 * Purpose: Free a scsi_device that points to the host adapter itself.
1549 * Arguments: SHpnt - Host that needs a scsi_device
1551 * Lock status: None assumed.
1557 void scsi_free_host_dev(struct scsi_device
*sdev
)
1559 BUG_ON(sdev
->id
!= sdev
->host
->this_id
);
1561 scsi_destroy_sdev(sdev
);
1563 EXPORT_SYMBOL(scsi_free_host_dev
);