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 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 * @sreq: used to send the command
115 * @result: area to store the result of the MODE SENSE
118 * Send a vendor specific MODE SENSE (not a MODE SELECT) command using
119 * @sreq to unlock a device, storing the (unused) results into result.
120 * Called for BLIST_KEY devices.
122 static void scsi_unlock_floptical(struct scsi_request
*sreq
,
123 unsigned char *result
)
125 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
127 printk(KERN_NOTICE
"scsi: unlocking floptical drive\n");
128 scsi_cmd
[0] = MODE_SENSE
;
132 scsi_cmd
[4] = 0x2a; /* size */
134 sreq
->sr_cmd_len
= 0;
135 sreq
->sr_data_direction
= DMA_FROM_DEVICE
;
136 scsi_wait_req(sreq
, scsi_cmd
, result
, 0x2a /* size */, SCSI_TIMEOUT
, 3);
140 * print_inquiry - printk the inquiry information
141 * @inq_result: printk this SCSI INQUIRY
144 * printk the vendor, model, and other information found in the
145 * INQUIRY data in @inq_result.
148 * Remove this, and replace with a hotplug event that logs any
149 * relevant information.
151 static void print_inquiry(unsigned char *inq_result
)
155 printk(KERN_NOTICE
" Vendor: ");
156 for (i
= 8; i
< 16; i
++)
157 if (inq_result
[i
] >= 0x20 && i
< inq_result
[4] + 5)
158 printk("%c", inq_result
[i
]);
163 for (i
= 16; i
< 32; i
++)
164 if (inq_result
[i
] >= 0x20 && i
< inq_result
[4] + 5)
165 printk("%c", inq_result
[i
]);
170 for (i
= 32; i
< 36; i
++)
171 if (inq_result
[i
] >= 0x20 && i
< inq_result
[4] + 5)
172 printk("%c", inq_result
[i
]);
178 i
= inq_result
[0] & 0x1f;
180 printk(KERN_NOTICE
" Type: %s ",
182 MAX_SCSI_DEVICE_CODE
? scsi_device_types
[i
] :
184 printk(" ANSI SCSI revision: %02x",
185 inq_result
[2] & 0x07);
186 if ((inq_result
[2] & 0x07) == 1 && (inq_result
[3] & 0x0f) == 1)
193 * scsi_alloc_sdev - allocate and setup a scsi_Device
196 * Allocate, initialize for io, and return a pointer to a scsi_Device.
197 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
198 * adds scsi_Device to the appropriate list.
201 * scsi_Device pointer, or NULL on failure.
203 static struct scsi_device
*scsi_alloc_sdev(struct scsi_target
*starget
,
204 unsigned int lun
, void *hostdata
)
206 struct scsi_device
*sdev
;
207 int display_failure_msg
= 1, ret
;
208 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
210 sdev
= kmalloc(sizeof(*sdev
) + shost
->transportt
->device_size
,
215 memset(sdev
, 0, sizeof(*sdev
));
216 sdev
->vendor
= scsi_null_device_strs
;
217 sdev
->model
= scsi_null_device_strs
;
218 sdev
->rev
= scsi_null_device_strs
;
220 sdev
->id
= starget
->id
;
222 sdev
->channel
= starget
->channel
;
223 sdev
->sdev_state
= SDEV_CREATED
;
224 INIT_LIST_HEAD(&sdev
->siblings
);
225 INIT_LIST_HEAD(&sdev
->same_target_siblings
);
226 INIT_LIST_HEAD(&sdev
->cmd_list
);
227 INIT_LIST_HEAD(&sdev
->starved_entry
);
228 spin_lock_init(&sdev
->list_lock
);
230 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
231 sdev
->sdev_target
= starget
;
233 /* usually NULL and set by ->slave_alloc instead */
234 sdev
->hostdata
= hostdata
;
236 /* if the device needs this changing, it may do so in the
237 * slave_configure function */
238 sdev
->max_device_blocked
= SCSI_DEFAULT_DEVICE_BLOCKED
;
241 * Some low level driver could use device->type
246 * Assume that the device will have handshaking problems,
247 * and then fix this field later if it turns out it
252 sdev
->request_queue
= scsi_alloc_queue(sdev
);
253 if (!sdev
->request_queue
) {
254 /* release fn is set up in scsi_sysfs_device_initialise, so
255 * have to free and put manually here */
256 put_device(&starget
->dev
);
260 sdev
->request_queue
->queuedata
= sdev
;
261 scsi_adjust_queue_depth(sdev
, 0, sdev
->host
->cmd_per_lun
);
263 scsi_sysfs_device_initialize(sdev
);
265 if (shost
->hostt
->slave_alloc
) {
266 ret
= shost
->hostt
->slave_alloc(sdev
);
269 * if LLDD reports slave not present, don't clutter
270 * console with alloc failure messages
275 display_failure_msg
= 0;
276 goto out_device_destroy
;
283 transport_destroy_device(&sdev
->sdev_gendev
);
284 scsi_free_queue(sdev
->request_queue
);
285 put_device(&sdev
->sdev_gendev
);
287 if (display_failure_msg
)
288 printk(ALLOC_FAILURE_MSG
, __FUNCTION__
);
292 static void scsi_target_dev_release(struct device
*dev
)
294 struct device
*parent
= dev
->parent
;
295 struct scsi_target
*starget
= to_scsi_target(dev
);
296 struct Scsi_Host
*shost
= dev_to_shost(parent
);
298 if (shost
->hostt
->target_destroy
)
299 shost
->hostt
->target_destroy(starget
);
304 int scsi_is_target_device(const struct device
*dev
)
306 return dev
->release
== scsi_target_dev_release
;
308 EXPORT_SYMBOL(scsi_is_target_device
);
310 static struct scsi_target
*__scsi_find_target(struct device
*parent
,
311 int channel
, uint id
)
313 struct scsi_target
*starget
, *found_starget
= NULL
;
314 struct Scsi_Host
*shost
= dev_to_shost(parent
);
316 * Search for an existing target for this sdev.
318 list_for_each_entry(starget
, &shost
->__targets
, siblings
) {
319 if (starget
->id
== id
&&
320 starget
->channel
== channel
) {
321 found_starget
= starget
;
326 get_device(&found_starget
->dev
);
328 return found_starget
;
331 static struct scsi_target
*scsi_alloc_target(struct device
*parent
,
332 int channel
, uint id
)
334 struct Scsi_Host
*shost
= dev_to_shost(parent
);
335 struct device
*dev
= NULL
;
337 const int size
= sizeof(struct scsi_target
)
338 + shost
->transportt
->target_size
;
339 struct scsi_target
*starget
;
340 struct scsi_target
*found_target
;
343 * Obtain the real parent from the transport. The transport
344 * is allowed to fail (no error) if there is nothing at that
347 if (shost
->transportt
->target_parent
) {
348 spin_lock_irqsave(shost
->host_lock
, flags
);
349 parent
= shost
->transportt
->target_parent(shost
, channel
, id
);
350 spin_unlock_irqrestore(shost
->host_lock
, flags
);
355 starget
= kmalloc(size
, GFP_KERNEL
);
357 printk(KERN_ERR
"%s: allocation failure\n", __FUNCTION__
);
360 memset(starget
, 0, size
);
362 device_initialize(dev
);
363 starget
->reap_ref
= 1;
364 dev
->parent
= get_device(parent
);
365 dev
->release
= scsi_target_dev_release
;
366 sprintf(dev
->bus_id
, "target%d:%d:%d",
367 shost
->host_no
, channel
, id
);
369 starget
->channel
= channel
;
370 INIT_LIST_HEAD(&starget
->siblings
);
371 INIT_LIST_HEAD(&starget
->devices
);
372 spin_lock_irqsave(shost
->host_lock
, flags
);
374 found_target
= __scsi_find_target(parent
, channel
, id
);
378 list_add_tail(&starget
->siblings
, &shost
->__targets
);
379 spin_unlock_irqrestore(shost
->host_lock
, flags
);
380 /* allocate and add */
381 transport_setup_device(dev
);
383 transport_add_device(dev
);
384 if (shost
->hostt
->target_alloc
) {
385 int error
= shost
->hostt
->target_alloc(starget
);
388 dev_printk(KERN_ERR
, dev
, "target allocation failed, error %d\n", error
);
389 /* don't want scsi_target_reap to do the final
390 * put because it will be under the host lock */
392 scsi_target_reap(starget
);
401 found_target
->reap_ref
++;
402 spin_unlock_irqrestore(shost
->host_lock
, flags
);
409 * scsi_target_reap - check to see if target is in use and destroy if not
411 * @starget: target to be checked
413 * This is used after removing a LUN or doing a last put of the target
414 * it checks atomically that nothing is using the target and removes
417 void scsi_target_reap(struct scsi_target
*starget
)
419 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
421 spin_lock_irqsave(shost
->host_lock
, flags
);
423 if (--starget
->reap_ref
== 0 && list_empty(&starget
->devices
)) {
424 list_del_init(&starget
->siblings
);
425 spin_unlock_irqrestore(shost
->host_lock
, flags
);
426 device_del(&starget
->dev
);
427 transport_unregister_device(&starget
->dev
);
428 put_device(&starget
->dev
);
431 spin_unlock_irqrestore(shost
->host_lock
, flags
);
435 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
436 * @sreq: used to send the INQUIRY
437 * @inq_result: area to store the INQUIRY result
438 * @bflags: store any bflags found here
441 * Probe the lun associated with @sreq using a standard SCSI INQUIRY;
443 * If the INQUIRY is successful, sreq->sr_result is zero and: the
444 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
445 * are copied to the Scsi_Device at @sreq->sr_device (sdev);
446 * any flags value is stored in *@bflags.
448 static void scsi_probe_lun(struct scsi_request
*sreq
, char *inq_result
,
451 struct scsi_device
*sdev
= sreq
->sr_device
; /* a bit ugly */
452 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
453 int first_inquiry_len
, try_inquiry_len
, next_inquiry_len
;
454 int response_len
= 0;
456 struct scsi_sense_hdr sshdr
;
460 /* Perform up to 3 passes. The first pass uses a conservative
461 * transfer length of 36 unless sdev->inquiry_len specifies a
462 * different value. */
463 first_inquiry_len
= sdev
->inquiry_len
? sdev
->inquiry_len
: 36;
464 try_inquiry_len
= first_inquiry_len
;
468 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: INQUIRY pass %d "
469 "to host %d channel %d id %d lun %d, length %d\n",
470 pass
, sdev
->host
->host_no
, sdev
->channel
,
471 sdev
->id
, sdev
->lun
, try_inquiry_len
));
473 /* Each pass gets up to three chances to ignore Unit Attention */
474 for (count
= 0; count
< 3; ++count
) {
475 memset(scsi_cmd
, 0, 6);
476 scsi_cmd
[0] = INQUIRY
;
477 scsi_cmd
[4] = (unsigned char) try_inquiry_len
;
478 sreq
->sr_cmd_len
= 0;
479 sreq
->sr_data_direction
= DMA_FROM_DEVICE
;
481 memset(inq_result
, 0, try_inquiry_len
);
482 scsi_wait_req(sreq
, (void *) scsi_cmd
, (void *) inq_result
,
484 HZ
/2 + HZ
*scsi_inq_timeout
, 3);
486 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: INQUIRY %s "
488 sreq
->sr_result
? "failed" : "successful",
491 if (sreq
->sr_result
) {
493 * not-ready to ready transition [asc/ascq=0x28/0x0]
494 * or power-on, reset [asc/ascq=0x29/0x0], continue.
495 * INQUIRY should not yield UNIT_ATTENTION
496 * but many buggy devices do so anyway.
498 if ((driver_byte(sreq
->sr_result
) & DRIVER_SENSE
) &&
499 scsi_request_normalize_sense(sreq
, &sshdr
)) {
500 if ((sshdr
.sense_key
== UNIT_ATTENTION
) &&
501 ((sshdr
.asc
== 0x28) ||
502 (sshdr
.asc
== 0x29)) &&
510 if (sreq
->sr_result
== 0) {
511 response_len
= (unsigned char) inq_result
[4] + 5;
512 if (response_len
> 255)
513 response_len
= first_inquiry_len
; /* sanity */
516 * Get any flags for this device.
518 * XXX add a bflags to Scsi_Device, and replace the
519 * corresponding bit fields in Scsi_Device, so bflags
520 * need not be passed as an argument.
522 *bflags
= scsi_get_device_flags(sdev
, &inq_result
[8],
525 /* When the first pass succeeds we gain information about
526 * what larger transfer lengths might work. */
528 if (BLIST_INQUIRY_36
& *bflags
)
529 next_inquiry_len
= 36;
530 else if (BLIST_INQUIRY_58
& *bflags
)
531 next_inquiry_len
= 58;
532 else if (sdev
->inquiry_len
)
533 next_inquiry_len
= sdev
->inquiry_len
;
535 next_inquiry_len
= response_len
;
537 /* If more data is available perform the second pass */
538 if (next_inquiry_len
> try_inquiry_len
) {
539 try_inquiry_len
= next_inquiry_len
;
545 } else if (pass
== 2) {
546 printk(KERN_INFO
"scsi scan: %d byte inquiry failed. "
547 "Consider BLIST_INQUIRY_36 for this device\n",
550 /* If this pass failed, the third pass goes back and transfers
551 * the same amount as we successfully got in the first pass. */
552 try_inquiry_len
= first_inquiry_len
;
557 /* If the last transfer attempt got an error, assume the
558 * peripheral doesn't exist or is dead. */
562 /* Don't report any more data than the device says is valid */
563 sdev
->inquiry_len
= min(try_inquiry_len
, response_len
);
566 * XXX Abort if the response length is less than 36? If less than
567 * 32, the lookup of the device flags (above) could be invalid,
568 * and it would be possible to take an incorrect action - we do
569 * not want to hang because of a short INQUIRY. On the flip side,
570 * if the device is spun down or becoming ready (and so it gives a
571 * short INQUIRY), an abort here prevents any further use of the
572 * device, including spin up.
574 * Related to the above issue:
576 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
577 * and if not ready, sent a START_STOP to start (maybe spin up) and
578 * then send the INQUIRY again, since the INQUIRY can change after
579 * a device is initialized.
581 * Ideally, start a device if explicitly asked to do so. This
582 * assumes that a device is spun up on power on, spun down on
583 * request, and then spun up on request.
587 * The scanning code needs to know the scsi_level, even if no
588 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
589 * non-zero LUNs can be scanned.
591 sdev
->scsi_level
= inq_result
[2] & 0x07;
592 if (sdev
->scsi_level
>= 2 ||
593 (sdev
->scsi_level
== 1 && (inq_result
[3] & 0x0f) == 1))
600 * scsi_add_lun - allocate and fully initialze a Scsi_Device
601 * @sdevscan: holds information to be stored in the new Scsi_Device
602 * @sdevnew: store the address of the newly allocated Scsi_Device
603 * @inq_result: holds the result of a previous INQUIRY to the LUN
604 * @bflags: black/white list flag
607 * Allocate and initialize a Scsi_Device matching sdevscan. Optionally
608 * set fields based on values in *@bflags. If @sdevnew is not
609 * NULL, store the address of the new Scsi_Device in *@sdevnew (needed
610 * when scanning a particular LUN).
613 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device
614 * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized
616 static int scsi_add_lun(struct scsi_device
*sdev
, char *inq_result
, int *bflags
)
619 * XXX do not save the inquiry, since it can change underneath us,
620 * save just vendor/model/rev.
622 * Rather than save it and have an ioctl that retrieves the saved
623 * value, have an ioctl that executes the same INQUIRY code used
624 * in scsi_probe_lun, let user level programs doing INQUIRY
625 * scanning run at their own risk, or supply a user level program
626 * that can correctly scan.
628 sdev
->inquiry
= kmalloc(sdev
->inquiry_len
, GFP_ATOMIC
);
629 if (sdev
->inquiry
== NULL
) {
630 return SCSI_SCAN_NO_RESPONSE
;
633 memcpy(sdev
->inquiry
, inq_result
, sdev
->inquiry_len
);
634 sdev
->vendor
= (char *) (sdev
->inquiry
+ 8);
635 sdev
->model
= (char *) (sdev
->inquiry
+ 16);
636 sdev
->rev
= (char *) (sdev
->inquiry
+ 32);
638 if (*bflags
& BLIST_ISROM
) {
640 * It would be better to modify sdev->type, and set
641 * sdev->removable, but then the print_inquiry() output
642 * would not show TYPE_ROM; if print_inquiry() is removed
643 * the issue goes away.
645 inq_result
[0] = TYPE_ROM
;
646 inq_result
[1] |= 0x80; /* removable */
647 } else if (*bflags
& BLIST_NO_ULD_ATTACH
)
648 sdev
->no_uld_attach
= 1;
650 switch (sdev
->type
= (inq_result
[0] & 0x1f)) {
657 case TYPE_MEDIUM_CHANGER
:
668 printk(KERN_INFO
"scsi: unknown device type %d\n", sdev
->type
);
671 print_inquiry(inq_result
);
674 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
675 * spec says: The device server is capable of supporting the
676 * specified peripheral device type on this logical unit. However,
677 * the physical device is not currently connected to this logical
680 * The above is vague, as it implies that we could treat 001 and
681 * 011 the same. Stay compatible with previous code, and create a
682 * Scsi_Device for a PQ of 1
684 * Don't set the device offline here; rather let the upper
685 * level drivers eval the PQ to decide whether they should
686 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
689 sdev
->inq_periph_qual
= (inq_result
[0] >> 5) & 7;
690 sdev
->removable
= (0x80 & inq_result
[1]) >> 7;
691 sdev
->lockable
= sdev
->removable
;
692 sdev
->soft_reset
= (inq_result
[7] & 1) && ((inq_result
[3] & 7) == 2);
694 if (sdev
->scsi_level
>= SCSI_3
|| (sdev
->inquiry_len
> 56 &&
695 inq_result
[56] & 0x04))
697 if (inq_result
[7] & 0x60)
699 if (inq_result
[7] & 0x10)
702 sprintf(sdev
->devfs_name
, "scsi/host%d/bus%d/target%d/lun%d",
703 sdev
->host
->host_no
, sdev
->channel
,
704 sdev
->id
, sdev
->lun
);
707 * End driverfs/devfs code.
710 if ((sdev
->scsi_level
>= SCSI_2
) && (inq_result
[7] & 2) &&
711 !(*bflags
& BLIST_NOTQ
))
712 sdev
->tagged_supported
= 1;
714 * Some devices (Texel CD ROM drives) have handshaking problems
715 * when used with the Seagate controllers. borken is initialized
716 * to 1, and then set it to 0 here.
718 if ((*bflags
& BLIST_BORKEN
) == 0)
722 * Apparently some really broken devices (contrary to the SCSI
723 * standards) need to be selected without asserting ATN
725 if (*bflags
& BLIST_SELECT_NO_ATN
)
726 sdev
->select_no_atn
= 1;
729 * Some devices may not want to have a start command automatically
730 * issued when a device is added.
732 if (*bflags
& BLIST_NOSTARTONADD
)
733 sdev
->no_start_on_add
= 1;
735 if (*bflags
& BLIST_SINGLELUN
)
736 sdev
->single_lun
= 1;
739 sdev
->use_10_for_rw
= 1;
741 if (*bflags
& BLIST_MS_SKIP_PAGE_08
)
742 sdev
->skip_ms_page_8
= 1;
744 if (*bflags
& BLIST_MS_SKIP_PAGE_3F
)
745 sdev
->skip_ms_page_3f
= 1;
747 if (*bflags
& BLIST_USE_10_BYTE_MS
)
748 sdev
->use_10_for_ms
= 1;
750 /* set the device running here so that slave configure
752 scsi_device_set_state(sdev
, SDEV_RUNNING
);
754 if (*bflags
& BLIST_MS_192_BYTES_FOR_3F
)
755 sdev
->use_192_bytes_for_3f
= 1;
757 if (*bflags
& BLIST_NOT_LOCKABLE
)
760 if (*bflags
& BLIST_RETRY_HWERROR
)
761 sdev
->retry_hwerror
= 1;
763 transport_configure_device(&sdev
->sdev_gendev
);
765 if (sdev
->host
->hostt
->slave_configure
)
766 sdev
->host
->hostt
->slave_configure(sdev
);
769 * Ok, the device is now all set up, we can
770 * register it and tell the rest of the kernel
773 if (scsi_sysfs_add_sdev(sdev
) != 0)
774 return SCSI_SCAN_NO_RESPONSE
;
776 return SCSI_SCAN_LUN_PRESENT
;
780 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
781 * @starget: pointer to target device structure
782 * @lun: LUN of target device
783 * @sdevscan: probe the LUN corresponding to this Scsi_Device
784 * @sdevnew: store the value of any new Scsi_Device allocated
785 * @bflagsp: store bflags here if not NULL
788 * Call scsi_probe_lun, if a LUN with an attached device is found,
789 * allocate and set it up by calling scsi_add_lun.
792 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device
793 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
794 * attached at the LUN
795 * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized
797 static int scsi_probe_and_add_lun(struct scsi_target
*starget
,
798 uint lun
, int *bflagsp
,
799 struct scsi_device
**sdevp
, int rescan
,
802 struct scsi_device
*sdev
;
803 struct scsi_request
*sreq
;
804 unsigned char *result
;
805 int bflags
, res
= SCSI_SCAN_NO_RESPONSE
;
806 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
809 * The rescan flag is used as an optimization, the first scan of a
810 * host adapter calls into here with rescan == 0.
813 sdev
= scsi_device_lookup_by_target(starget
, lun
);
815 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
816 "scsi scan: device exists on %s\n",
817 sdev
->sdev_gendev
.bus_id
));
821 scsi_device_put(sdev
);
824 *bflagsp
= scsi_get_device_flags(sdev
,
827 return SCSI_SCAN_LUN_PRESENT
;
831 sdev
= scsi_alloc_sdev(starget
, lun
, hostdata
);
834 sreq
= scsi_allocate_request(sdev
, GFP_ATOMIC
);
837 result
= kmalloc(256, GFP_ATOMIC
|
838 ((shost
->unchecked_isa_dma
) ? __GFP_DMA
: 0));
842 scsi_probe_lun(sreq
, result
, &bflags
);
844 goto out_free_result
;
847 * result contains valid SCSI INQUIRY data.
849 if ((result
[0] >> 5) == 3) {
851 * For a Peripheral qualifier 3 (011b), the SCSI
852 * spec says: The device server is not capable of
853 * supporting a physical device on this logical
856 * For disks, this implies that there is no
857 * logical disk configured at sdev->lun, but there
858 * is a target id responding.
860 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
861 "scsi scan: peripheral qualifier of 3,"
862 " no device added\n"));
863 res
= SCSI_SCAN_TARGET_PRESENT
;
864 goto out_free_result
;
867 res
= scsi_add_lun(sdev
, result
, &bflags
);
868 if (res
== SCSI_SCAN_LUN_PRESENT
) {
869 if (bflags
& BLIST_KEY
) {
871 scsi_unlock_floptical(sreq
, result
);
880 scsi_release_request(sreq
);
882 if (res
== SCSI_SCAN_LUN_PRESENT
) {
884 scsi_device_get(sdev
);
888 if (sdev
->host
->hostt
->slave_destroy
)
889 sdev
->host
->hostt
->slave_destroy(sdev
);
890 transport_destroy_device(&sdev
->sdev_gendev
);
891 put_device(&sdev
->sdev_gendev
);
898 * scsi_sequential_lun_scan - sequentially scan a SCSI target
899 * @starget: pointer to target structure to scan
900 * @bflags: black/white list flag for LUN 0
901 * @lun0_res: result of scanning LUN 0
904 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
905 * scanned) to some maximum lun until a LUN is found with no device
906 * attached. Use the bflags to figure out any oddities.
908 * Modifies sdevscan->lun.
910 static void scsi_sequential_lun_scan(struct scsi_target
*starget
,
911 int bflags
, int lun0_res
, int scsi_level
,
914 unsigned int sparse_lun
, lun
, max_dev_lun
;
915 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
917 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: Sequential scan of"
918 "%s\n", starget
->dev
.bus_id
));
920 max_dev_lun
= min(max_scsi_luns
, shost
->max_lun
);
922 * If this device is known to support sparse multiple units,
923 * override the other settings, and scan all of them. Normally,
924 * SCSI-3 devices should be scanned via the REPORT LUNS.
926 if (bflags
& BLIST_SPARSELUN
) {
927 max_dev_lun
= shost
->max_lun
;
933 * If not sparse lun and no device attached at LUN 0 do not scan
936 if (!sparse_lun
&& (lun0_res
!= SCSI_SCAN_LUN_PRESENT
))
940 * If less than SCSI_1_CSS, and no special lun scaning, stop
941 * scanning; this matches 2.4 behaviour, but could just be a bug
942 * (to continue scanning a SCSI_1_CSS device).
944 * This test is broken. We might not have any device on lun0 for
945 * a sparselun device, and if that's the case then how would we
946 * know the real scsi_level, eh? It might make sense to just not
947 * scan any SCSI_1 device for non-0 luns, but that check would best
948 * go into scsi_alloc_sdev() and just have it return null when asked
949 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
951 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
952 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
957 * If this device is known to support multiple units, override
958 * the other settings, and scan all of them.
960 if (bflags
& BLIST_FORCELUN
)
961 max_dev_lun
= shost
->max_lun
;
963 * REGAL CDC-4X: avoid hang after LUN 4
965 if (bflags
& BLIST_MAX5LUN
)
966 max_dev_lun
= min(5U, max_dev_lun
);
968 * Do not scan SCSI-2 or lower device past LUN 7, unless
971 if (scsi_level
< SCSI_3
&& !(bflags
& BLIST_LARGELUN
))
972 max_dev_lun
= min(8U, max_dev_lun
);
975 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
976 * until we reach the max, or no LUN is found and we are not
979 for (lun
= 1; lun
< max_dev_lun
; ++lun
)
980 if ((scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
,
981 NULL
) != SCSI_SCAN_LUN_PRESENT
) &&
987 * scsilun_to_int: convert a scsi_lun to an int
988 * @scsilun: struct scsi_lun to be converted.
991 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
992 * integer, and return the result. The caller must check for
993 * truncation before using this function.
996 * The struct scsi_lun is assumed to be four levels, with each level
997 * effectively containing a SCSI byte-ordered (big endian) short; the
998 * addressing bits of each level are ignored (the highest two bits).
999 * For a description of the LUN format, post SCSI-3 see the SCSI
1000 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1002 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1003 * the integer: 0x0b030a04
1005 static int scsilun_to_int(struct scsi_lun
*scsilun
)
1011 for (i
= 0; i
< sizeof(lun
); i
+= 2)
1012 lun
= lun
| (((scsilun
->scsi_lun
[i
] << 8) |
1013 scsilun
->scsi_lun
[i
+ 1]) << (i
* 8));
1018 * int_to_scsilun: reverts an int into a scsi_lun
1019 * @int: integer to be reverted
1020 * @scsilun: struct scsi_lun to be set.
1023 * Reverts the functionality of the scsilun_to_int, which packed
1024 * an 8-byte lun value into an int. This routine unpacks the int
1025 * back into the lun value.
1026 * Note: the scsilun_to_int() routine does not truly handle all
1027 * 8bytes of the lun value. This functions restores only as much
1028 * as was set by the routine.
1031 * Given an integer : 0x0b030a04, this function returns a
1032 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1035 void int_to_scsilun(unsigned int lun
, struct scsi_lun
*scsilun
)
1039 memset(scsilun
->scsi_lun
, 0, sizeof(scsilun
->scsi_lun
));
1041 for (i
= 0; i
< sizeof(lun
); i
+= 2) {
1042 scsilun
->scsi_lun
[i
] = (lun
>> 8) & 0xFF;
1043 scsilun
->scsi_lun
[i
+1] = lun
& 0xFF;
1047 EXPORT_SYMBOL(int_to_scsilun
);
1050 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1051 * @sdevscan: scan the host, channel, and id of this Scsi_Device
1054 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1055 * command, and scan the resulting list of LUNs by calling
1056 * scsi_probe_and_add_lun.
1058 * Modifies sdevscan->lun.
1061 * 0: scan completed (or no memory, so further scanning is futile)
1062 * 1: no report lun scan, or not configured
1064 static int scsi_report_lun_scan(struct scsi_device
*sdev
, int bflags
,
1068 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
1069 unsigned int length
;
1071 unsigned int num_luns
;
1072 unsigned int retries
;
1073 struct scsi_lun
*lunp
, *lun_data
;
1074 struct scsi_request
*sreq
;
1076 struct scsi_sense_hdr sshdr
;
1077 struct scsi_target
*starget
= scsi_target(sdev
);
1080 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1081 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1082 * support more than 8 LUNs.
1084 if ((bflags
& BLIST_NOREPORTLUN
) ||
1085 sdev
->scsi_level
< SCSI_2
||
1086 (sdev
->scsi_level
< SCSI_3
&&
1087 (!(bflags
& BLIST_REPORTLUN2
) || sdev
->host
->max_lun
<= 8)) )
1089 if (bflags
& BLIST_NOLUN
)
1092 sreq
= scsi_allocate_request(sdev
, GFP_ATOMIC
);
1096 sprintf(devname
, "host %d channel %d id %d",
1097 sdev
->host
->host_no
, sdev
->channel
, sdev
->id
);
1100 * Allocate enough to hold the header (the same size as one scsi_lun)
1101 * plus the max number of luns we are requesting.
1103 * Reallocating and trying again (with the exact amount we need)
1104 * would be nice, but then we need to somehow limit the size
1105 * allocated based on the available memory and the limits of
1106 * kmalloc - we don't want a kmalloc() failure of a huge value to
1107 * prevent us from finding any LUNs on this target.
1109 length
= (max_scsi_report_luns
+ 1) * sizeof(struct scsi_lun
);
1110 lun_data
= kmalloc(length
, GFP_ATOMIC
|
1111 (sdev
->host
->unchecked_isa_dma
? __GFP_DMA
: 0));
1113 goto out_release_request
;
1115 scsi_cmd
[0] = REPORT_LUNS
;
1118 * bytes 1 - 5: reserved, set to zero.
1120 memset(&scsi_cmd
[1], 0, 5);
1123 * bytes 6 - 9: length of the command.
1125 scsi_cmd
[6] = (unsigned char) (length
>> 24) & 0xff;
1126 scsi_cmd
[7] = (unsigned char) (length
>> 16) & 0xff;
1127 scsi_cmd
[8] = (unsigned char) (length
>> 8) & 0xff;
1128 scsi_cmd
[9] = (unsigned char) length
& 0xff;
1130 scsi_cmd
[10] = 0; /* reserved */
1131 scsi_cmd
[11] = 0; /* control */
1132 sreq
->sr_cmd_len
= 0;
1133 sreq
->sr_data_direction
= DMA_FROM_DEVICE
;
1136 * We can get a UNIT ATTENTION, for example a power on/reset, so
1137 * retry a few times (like sd.c does for TEST UNIT READY).
1138 * Experience shows some combinations of adapter/devices get at
1139 * least two power on/resets.
1141 * Illegal requests (for devices that do not support REPORT LUNS)
1142 * should come through as a check condition, and will not generate
1145 for (retries
= 0; retries
< 3; retries
++) {
1146 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: Sending"
1147 " REPORT LUNS to %s (try %d)\n", devname
,
1149 scsi_wait_req(sreq
, scsi_cmd
, lun_data
, length
,
1150 SCSI_TIMEOUT
+ 4*HZ
, 3);
1151 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: REPORT LUNS"
1152 " %s (try %d) result 0x%x\n", sreq
->sr_result
1153 ? "failed" : "successful", retries
,
1155 if (sreq
->sr_result
== 0)
1157 else if (scsi_request_normalize_sense(sreq
, &sshdr
)) {
1158 if (sshdr
.sense_key
!= UNIT_ATTENTION
)
1163 if (sreq
->sr_result
) {
1165 * The device probably does not support a REPORT LUN command
1168 scsi_release_request(sreq
);
1171 scsi_release_request(sreq
);
1174 * Get the length from the first four bytes of lun_data.
1176 data
= (u8
*) lun_data
->scsi_lun
;
1177 length
= ((data
[0] << 24) | (data
[1] << 16) |
1178 (data
[2] << 8) | (data
[3] << 0));
1180 num_luns
= (length
/ sizeof(struct scsi_lun
));
1181 if (num_luns
> max_scsi_report_luns
) {
1182 printk(KERN_WARNING
"scsi: On %s only %d (max_scsi_report_luns)"
1183 " of %d luns reported, try increasing"
1184 " max_scsi_report_luns.\n", devname
,
1185 max_scsi_report_luns
, num_luns
);
1186 num_luns
= max_scsi_report_luns
;
1189 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: REPORT LUN scan of"
1190 " host %d channel %d id %d\n", sdev
->host
->host_no
,
1191 sdev
->channel
, sdev
->id
));
1194 * Scan the luns in lun_data. The entry at offset 0 is really
1195 * the header, so start at 1 and go up to and including num_luns.
1197 for (lunp
= &lun_data
[1]; lunp
<= &lun_data
[num_luns
]; lunp
++) {
1198 lun
= scsilun_to_int(lunp
);
1201 * Check if the unused part of lunp is non-zero, and so
1202 * does not fit in lun.
1204 if (memcmp(&lunp
->scsi_lun
[sizeof(lun
)], "\0\0\0\0", 4)) {
1208 * Output an error displaying the LUN in byte order,
1209 * this differs from what linux would print for the
1210 * integer LUN value.
1212 printk(KERN_WARNING
"scsi: %s lun 0x", devname
);
1213 data
= (char *)lunp
->scsi_lun
;
1214 for (i
= 0; i
< sizeof(struct scsi_lun
); i
++)
1215 printk("%02x", data
[i
]);
1216 printk(" has a LUN larger than currently supported.\n");
1217 } else if (lun
== 0) {
1219 * LUN 0 has already been scanned.
1221 } else if (lun
> sdev
->host
->max_lun
) {
1222 printk(KERN_WARNING
"scsi: %s lun%d has a LUN larger"
1223 " than allowed by the host adapter\n",
1228 res
= scsi_probe_and_add_lun(starget
,
1229 lun
, NULL
, NULL
, rescan
, NULL
);
1230 if (res
== SCSI_SCAN_NO_RESPONSE
) {
1232 * Got some results, but now none, abort.
1234 printk(KERN_ERR
"scsi: Unexpected response"
1235 " from %s lun %d while scanning, scan"
1236 " aborted\n", devname
, lun
);
1245 out_release_request
:
1246 scsi_release_request(sreq
);
1249 * We are out of memory, don't try scanning any further.
1251 printk(ALLOC_FAILURE_MSG
, __FUNCTION__
);
1255 struct scsi_device
*__scsi_add_device(struct Scsi_Host
*shost
, uint channel
,
1256 uint id
, uint lun
, void *hostdata
)
1258 struct scsi_device
*sdev
;
1259 struct device
*parent
= &shost
->shost_gendev
;
1261 struct scsi_target
*starget
= scsi_alloc_target(parent
, channel
, id
);
1264 return ERR_PTR(-ENOMEM
);
1266 get_device(&starget
->dev
);
1267 down(&shost
->scan_mutex
);
1268 res
= scsi_probe_and_add_lun(starget
, lun
, NULL
, &sdev
, 1, hostdata
);
1269 if (res
!= SCSI_SCAN_LUN_PRESENT
)
1270 sdev
= ERR_PTR(-ENODEV
);
1271 up(&shost
->scan_mutex
);
1272 scsi_target_reap(starget
);
1273 put_device(&starget
->dev
);
1277 EXPORT_SYMBOL(__scsi_add_device
);
1279 void scsi_rescan_device(struct device
*dev
)
1281 struct scsi_driver
*drv
;
1286 drv
= to_scsi_driver(dev
->driver
);
1287 if (try_module_get(drv
->owner
)) {
1290 module_put(drv
->owner
);
1293 EXPORT_SYMBOL(scsi_rescan_device
);
1296 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1298 * @sdevsca: Scsi_Device handle for scanning
1299 * @shost: host to scan
1300 * @channel: channel to scan
1301 * @id: target id to scan
1304 * Scan the target id on @shost, @channel, and @id. Scan at least LUN
1305 * 0, and possibly all LUNs on the target id.
1307 * Use the pre-allocated @sdevscan as a handle for the scanning. This
1308 * function sets sdevscan->host, sdevscan->id and sdevscan->lun; the
1309 * scanning functions modify sdevscan->lun.
1311 * First try a REPORT LUN scan, if that does not scan the target, do a
1312 * sequential scan of LUNs on the target id.
1314 void scsi_scan_target(struct device
*parent
, unsigned int channel
,
1315 unsigned int id
, unsigned int lun
, int rescan
)
1317 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1320 struct scsi_device
*sdev
= NULL
;
1321 struct scsi_target
*starget
;
1323 if (shost
->this_id
== id
)
1325 * Don't scan the host adapter
1330 starget
= scsi_alloc_target(parent
, channel
, id
);
1335 get_device(&starget
->dev
);
1336 if (lun
!= SCAN_WILD_CARD
) {
1338 * Scan for a specific host/chan/id/lun.
1340 scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
, NULL
);
1345 * Scan LUN 0, if there is some response, scan further. Ideally, we
1346 * would not configure LUN 0 until all LUNs are scanned.
1348 res
= scsi_probe_and_add_lun(starget
, 0, &bflags
, &sdev
, rescan
, NULL
);
1349 if (res
== SCSI_SCAN_LUN_PRESENT
) {
1350 if (scsi_report_lun_scan(sdev
, bflags
, rescan
) != 0)
1352 * The REPORT LUN did not scan the target,
1353 * do a sequential scan.
1355 scsi_sequential_lun_scan(starget
, bflags
,
1356 res
, sdev
->scsi_level
, rescan
);
1357 } else if (res
== SCSI_SCAN_TARGET_PRESENT
) {
1359 * There's a target here, but lun 0 is offline so we
1360 * can't use the report_lun scan. Fall back to a
1361 * sequential lun scan with a bflags of SPARSELUN and
1362 * a default scsi level of SCSI_2
1364 scsi_sequential_lun_scan(starget
, BLIST_SPARSELUN
,
1365 SCSI_SCAN_TARGET_PRESENT
, SCSI_2
, rescan
);
1368 scsi_device_put(sdev
);
1371 /* now determine if the target has any children at all
1372 * and if not, nuke it */
1373 scsi_target_reap(starget
);
1375 put_device(&starget
->dev
);
1377 EXPORT_SYMBOL(scsi_scan_target
);
1379 static void scsi_scan_channel(struct Scsi_Host
*shost
, unsigned int channel
,
1380 unsigned int id
, unsigned int lun
, int rescan
)
1384 if (id
== SCAN_WILD_CARD
)
1385 for (id
= 0; id
< shost
->max_id
; ++id
) {
1387 * XXX adapter drivers when possible (FCP, iSCSI)
1388 * could modify max_id to match the current max,
1389 * not the absolute max.
1391 * XXX add a shost id iterator, so for example,
1392 * the FC ID can be the same as a target id
1393 * without a huge overhead of sparse id's.
1395 if (shost
->reverse_ordering
)
1397 * Scan from high to low id.
1399 order_id
= shost
->max_id
- id
- 1;
1402 scsi_scan_target(&shost
->shost_gendev
, channel
, order_id
, lun
, rescan
);
1405 scsi_scan_target(&shost
->shost_gendev
, channel
, id
, lun
, rescan
);
1408 int scsi_scan_host_selected(struct Scsi_Host
*shost
, unsigned int channel
,
1409 unsigned int id
, unsigned int lun
, int rescan
)
1411 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"%s: <%u:%u:%u:%u>\n",
1412 __FUNCTION__
, shost
->host_no
, channel
, id
, lun
));
1414 if (((channel
!= SCAN_WILD_CARD
) && (channel
> shost
->max_channel
)) ||
1415 ((id
!= SCAN_WILD_CARD
) && (id
> shost
->max_id
)) ||
1416 ((lun
!= SCAN_WILD_CARD
) && (lun
> shost
->max_lun
)))
1419 down(&shost
->scan_mutex
);
1420 if (channel
== SCAN_WILD_CARD
)
1421 for (channel
= 0; channel
<= shost
->max_channel
; channel
++)
1422 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1424 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1425 up(&shost
->scan_mutex
);
1431 * scsi_scan_host - scan the given adapter
1432 * @shost: adapter to scan
1434 void scsi_scan_host(struct Scsi_Host
*shost
)
1436 scsi_scan_host_selected(shost
, SCAN_WILD_CARD
, SCAN_WILD_CARD
,
1439 EXPORT_SYMBOL(scsi_scan_host
);
1442 * scsi_scan_single_target - scan the given SCSI target
1443 * @shost: adapter to scan
1444 * @chan: channel to scan
1445 * @id: target id to scan
1447 void scsi_scan_single_target(struct Scsi_Host
*shost
,
1448 unsigned int chan
, unsigned int id
)
1450 scsi_scan_host_selected(shost
, chan
, id
, SCAN_WILD_CARD
, 1);
1452 EXPORT_SYMBOL(scsi_scan_single_target
);
1454 void scsi_forget_host(struct Scsi_Host
*shost
)
1456 struct scsi_target
*starget
, *tmp
;
1457 unsigned long flags
;
1460 * Ok, this look a bit strange. We always look for the first device
1461 * on the list as scsi_remove_device removes them from it - thus we
1462 * also have to release the lock.
1463 * We don't need to get another reference to the device before
1464 * releasing the lock as we already own the reference from
1465 * scsi_register_device that's release in scsi_remove_device. And
1466 * after that we don't look at sdev anymore.
1468 spin_lock_irqsave(shost
->host_lock
, flags
);
1469 list_for_each_entry_safe(starget
, tmp
, &shost
->__targets
, siblings
) {
1470 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1471 scsi_remove_target(&starget
->dev
);
1472 spin_lock_irqsave(shost
->host_lock
, flags
);
1474 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1478 * Function: scsi_get_host_dev()
1480 * Purpose: Create a Scsi_Device that points to the host adapter itself.
1482 * Arguments: SHpnt - Host that needs a Scsi_Device
1484 * Lock status: None assumed.
1486 * Returns: The Scsi_Device or NULL
1489 * Attach a single Scsi_Device to the Scsi_Host - this should
1490 * be made to look like a "pseudo-device" that points to the
1493 * Note - this device is not accessible from any high-level
1494 * drivers (including generics), which is probably not
1495 * optimal. We can add hooks later to attach
1497 struct scsi_device
*scsi_get_host_dev(struct Scsi_Host
*shost
)
1499 struct scsi_device
*sdev
;
1500 struct scsi_target
*starget
;
1502 starget
= scsi_alloc_target(&shost
->shost_gendev
, 0, shost
->this_id
);
1506 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1508 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
1511 put_device(&starget
->dev
);
1514 EXPORT_SYMBOL(scsi_get_host_dev
);
1517 * Function: scsi_free_host_dev()
1519 * Purpose: Free a scsi_device that points to the host adapter itself.
1521 * Arguments: SHpnt - Host that needs a Scsi_Device
1523 * Lock status: None assumed.
1529 void scsi_free_host_dev(struct scsi_device
*sdev
)
1531 BUG_ON(sdev
->id
!= sdev
->host
->this_id
);
1533 if (sdev
->host
->hostt
->slave_destroy
)
1534 sdev
->host
->hostt
->slave_destroy(sdev
);
1535 transport_destroy_device(&sdev
->sdev_gendev
);
1536 put_device(&sdev
->sdev_gendev
);
1538 EXPORT_SYMBOL(scsi_free_host_dev
);