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 <asm/semaphore.h>
34 #include <scsi/scsi.h>
35 #include <scsi/scsi_cmnd.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_transport.h>
41 #include <scsi/scsi_eh.h>
43 #include "scsi_priv.h"
44 #include "scsi_logging.h"
46 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
47 " SCSI scanning, some SCSI devices might not be configured\n"
52 #define SCSI_TIMEOUT (2*HZ)
55 * Prefix values for the SCSI id's (stored in driverfs name field)
57 #define SCSI_UID_SER_NUM 'S'
58 #define SCSI_UID_UNKNOWN 'Z'
61 * Return values of some of the scanning functions.
63 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
64 * includes allocation or general failures preventing IO from being sent.
66 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
69 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
72 #define SCSI_SCAN_NO_RESPONSE 0
73 #define SCSI_SCAN_TARGET_PRESENT 1
74 #define SCSI_SCAN_LUN_PRESENT 2
76 static const char *scsi_null_device_strs
= "nullnullnullnull";
78 #define MAX_SCSI_LUNS 512
80 #ifdef CONFIG_SCSI_MULTI_LUN
81 static unsigned int max_scsi_luns
= MAX_SCSI_LUNS
;
83 static unsigned int max_scsi_luns
= 1;
86 module_param_named(max_luns
, max_scsi_luns
, int, S_IRUGO
|S_IWUSR
);
87 MODULE_PARM_DESC(max_luns
,
88 "last scsi LUN (should be between 1 and 2^32-1)");
91 * max_scsi_report_luns: the maximum number of LUNS that will be
92 * returned from the REPORT LUNS command. 8 times this value must
93 * be allocated. In theory this could be up to an 8 byte value, but
94 * in practice, the maximum number of LUNs suppored by any device
97 static unsigned int max_scsi_report_luns
= 511;
99 module_param_named(max_report_luns
, max_scsi_report_luns
, int, S_IRUGO
|S_IWUSR
);
100 MODULE_PARM_DESC(max_report_luns
,
101 "REPORT LUNS maximum number of LUNS received (should be"
102 " between 1 and 16384)");
104 static unsigned int scsi_inq_timeout
= SCSI_TIMEOUT
/HZ
+3;
106 module_param_named(inq_timeout
, scsi_inq_timeout
, int, S_IRUGO
|S_IWUSR
);
107 MODULE_PARM_DESC(inq_timeout
,
108 "Timeout (in seconds) waiting for devices to answer INQUIRY."
109 " Default is 5. Some non-compliant devices need more.");
112 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
113 * @sdev: scsi device to send command to
114 * @result: area to store the result of the MODE SENSE
117 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
118 * Called for BLIST_KEY devices.
120 static void scsi_unlock_floptical(struct scsi_device
*sdev
,
121 unsigned char *result
)
123 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
125 printk(KERN_NOTICE
"scsi: unlocking floptical drive\n");
126 scsi_cmd
[0] = MODE_SENSE
;
130 scsi_cmd
[4] = 0x2a; /* size */
132 scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
, result
, 0x2a, NULL
,
137 * scsi_alloc_sdev - allocate and setup a scsi_Device
140 * Allocate, initialize for io, and return a pointer to a scsi_Device.
141 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
142 * adds scsi_Device to the appropriate list.
145 * scsi_Device pointer, or NULL on failure.
147 static struct scsi_device
*scsi_alloc_sdev(struct scsi_target
*starget
,
148 unsigned int lun
, void *hostdata
)
150 struct scsi_device
*sdev
;
151 int display_failure_msg
= 1, ret
;
152 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
154 sdev
= kzalloc(sizeof(*sdev
) + shost
->transportt
->device_size
,
159 sdev
->vendor
= scsi_null_device_strs
;
160 sdev
->model
= scsi_null_device_strs
;
161 sdev
->rev
= scsi_null_device_strs
;
163 sdev
->id
= starget
->id
;
165 sdev
->channel
= starget
->channel
;
166 sdev
->sdev_state
= SDEV_CREATED
;
167 INIT_LIST_HEAD(&sdev
->siblings
);
168 INIT_LIST_HEAD(&sdev
->same_target_siblings
);
169 INIT_LIST_HEAD(&sdev
->cmd_list
);
170 INIT_LIST_HEAD(&sdev
->starved_entry
);
171 spin_lock_init(&sdev
->list_lock
);
173 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
174 sdev
->sdev_target
= starget
;
176 /* usually NULL and set by ->slave_alloc instead */
177 sdev
->hostdata
= hostdata
;
179 /* if the device needs this changing, it may do so in the
180 * slave_configure function */
181 sdev
->max_device_blocked
= SCSI_DEFAULT_DEVICE_BLOCKED
;
184 * Some low level driver could use device->type
189 * Assume that the device will have handshaking problems,
190 * and then fix this field later if it turns out it
195 sdev
->request_queue
= scsi_alloc_queue(sdev
);
196 if (!sdev
->request_queue
) {
197 /* release fn is set up in scsi_sysfs_device_initialise, so
198 * have to free and put manually here */
199 put_device(&starget
->dev
);
204 sdev
->request_queue
->queuedata
= sdev
;
205 scsi_adjust_queue_depth(sdev
, 0, sdev
->host
->cmd_per_lun
);
207 scsi_sysfs_device_initialize(sdev
);
209 if (shost
->hostt
->slave_alloc
) {
210 ret
= shost
->hostt
->slave_alloc(sdev
);
213 * if LLDD reports slave not present, don't clutter
214 * console with alloc failure messages
217 display_failure_msg
= 0;
218 goto out_device_destroy
;
225 transport_destroy_device(&sdev
->sdev_gendev
);
226 put_device(&sdev
->sdev_gendev
);
228 if (display_failure_msg
)
229 printk(ALLOC_FAILURE_MSG
, __FUNCTION__
);
233 static void scsi_target_dev_release(struct device
*dev
)
235 struct device
*parent
= dev
->parent
;
236 struct scsi_target
*starget
= to_scsi_target(dev
);
242 int scsi_is_target_device(const struct device
*dev
)
244 return dev
->release
== scsi_target_dev_release
;
246 EXPORT_SYMBOL(scsi_is_target_device
);
248 static struct scsi_target
*__scsi_find_target(struct device
*parent
,
249 int channel
, uint id
)
251 struct scsi_target
*starget
, *found_starget
= NULL
;
252 struct Scsi_Host
*shost
= dev_to_shost(parent
);
254 * Search for an existing target for this sdev.
256 list_for_each_entry(starget
, &shost
->__targets
, siblings
) {
257 if (starget
->id
== id
&&
258 starget
->channel
== channel
) {
259 found_starget
= starget
;
264 get_device(&found_starget
->dev
);
266 return found_starget
;
270 * scsi_alloc_target - allocate a new or find an existing target
271 * @parent: parent of the target (need not be a scsi host)
272 * @channel: target channel number (zero if no channels)
273 * @id: target id number
275 * Return an existing target if one exists, provided it hasn't already
276 * gone into STARGET_DEL state, otherwise allocate a new target.
278 * The target is returned with an incremented reference, so the caller
279 * is responsible for both reaping and doing a last put
281 static struct scsi_target
*scsi_alloc_target(struct device
*parent
,
282 int channel
, uint id
)
284 struct Scsi_Host
*shost
= dev_to_shost(parent
);
285 struct device
*dev
= NULL
;
287 const int size
= sizeof(struct scsi_target
)
288 + shost
->transportt
->target_size
;
289 struct scsi_target
*starget
;
290 struct scsi_target
*found_target
;
293 starget
= kzalloc(size
, GFP_KERNEL
);
295 printk(KERN_ERR
"%s: allocation failure\n", __FUNCTION__
);
299 device_initialize(dev
);
300 starget
->reap_ref
= 1;
301 dev
->parent
= get_device(parent
);
302 dev
->release
= scsi_target_dev_release
;
303 sprintf(dev
->bus_id
, "target%d:%d:%d",
304 shost
->host_no
, channel
, id
);
306 starget
->channel
= channel
;
307 INIT_LIST_HEAD(&starget
->siblings
);
308 INIT_LIST_HEAD(&starget
->devices
);
309 starget
->state
= STARGET_RUNNING
;
311 spin_lock_irqsave(shost
->host_lock
, flags
);
313 found_target
= __scsi_find_target(parent
, channel
, id
);
317 list_add_tail(&starget
->siblings
, &shost
->__targets
);
318 spin_unlock_irqrestore(shost
->host_lock
, flags
);
319 /* allocate and add */
320 transport_setup_device(dev
);
321 error
= device_add(dev
);
323 dev_err(dev
, "target device_add failed, error %d\n", error
);
324 spin_lock_irqsave(shost
->host_lock
, flags
);
325 list_del_init(&starget
->siblings
);
326 spin_unlock_irqrestore(shost
->host_lock
, flags
);
327 transport_destroy_device(dev
);
332 transport_add_device(dev
);
333 if (shost
->hostt
->target_alloc
) {
334 error
= shost
->hostt
->target_alloc(starget
);
337 dev_printk(KERN_ERR
, dev
, "target allocation failed, error %d\n", error
);
338 /* don't want scsi_target_reap to do the final
339 * put because it will be under the host lock */
341 scsi_target_reap(starget
);
351 found_target
->reap_ref
++;
352 spin_unlock_irqrestore(shost
->host_lock
, flags
);
353 if (found_target
->state
!= STARGET_DEL
) {
358 /* Unfortunately, we found a dying target; need to
359 * wait until it's dead before we can get a new one */
360 put_device(&found_target
->dev
);
361 flush_scheduled_work();
365 static void scsi_target_reap_usercontext(void *data
)
367 struct scsi_target
*starget
= data
;
368 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
371 transport_remove_device(&starget
->dev
);
372 device_del(&starget
->dev
);
373 transport_destroy_device(&starget
->dev
);
374 spin_lock_irqsave(shost
->host_lock
, flags
);
375 if (shost
->hostt
->target_destroy
)
376 shost
->hostt
->target_destroy(starget
);
377 list_del_init(&starget
->siblings
);
378 spin_unlock_irqrestore(shost
->host_lock
, flags
);
379 put_device(&starget
->dev
);
383 * scsi_target_reap - check to see if target is in use and destroy if not
385 * @starget: target to be checked
387 * This is used after removing a LUN or doing a last put of the target
388 * it checks atomically that nothing is using the target and removes
391 void scsi_target_reap(struct scsi_target
*starget
)
393 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
396 spin_lock_irqsave(shost
->host_lock
, flags
);
398 if (--starget
->reap_ref
== 0 && list_empty(&starget
->devices
)) {
399 BUG_ON(starget
->state
== STARGET_DEL
);
400 starget
->state
= STARGET_DEL
;
401 spin_unlock_irqrestore(shost
->host_lock
, flags
);
402 execute_in_process_context(scsi_target_reap_usercontext
,
403 starget
, &starget
->ew
);
407 spin_unlock_irqrestore(shost
->host_lock
, flags
);
413 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
414 * @s: INQUIRY result string to sanitize
415 * @len: length of the string
418 * The SCSI spec says that INQUIRY vendor, product, and revision
419 * strings must consist entirely of graphic ASCII characters,
420 * padded on the right with spaces. Since not all devices obey
421 * this rule, we will replace non-graphic or non-ASCII characters
422 * with spaces. Exception: a NUL character is interpreted as a
423 * string terminator, so all the following characters are set to
426 static void sanitize_inquiry_string(unsigned char *s
, int len
)
430 for (; len
> 0; (--len
, ++s
)) {
433 if (terminated
|| *s
< 0x20 || *s
> 0x7e)
439 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
440 * @sdev: scsi_device to probe
441 * @inq_result: area to store the INQUIRY result
442 * @result_len: len of inq_result
443 * @bflags: store any bflags found here
446 * Probe the lun associated with @req using a standard SCSI INQUIRY;
448 * If the INQUIRY is successful, zero is returned and the
449 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
450 * are copied to the scsi_device any flags value is stored in *@bflags.
452 static int scsi_probe_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
453 int result_len
, int *bflags
)
455 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
456 int first_inquiry_len
, try_inquiry_len
, next_inquiry_len
;
457 int response_len
= 0;
458 int pass
, count
, result
;
459 struct scsi_sense_hdr sshdr
;
463 /* Perform up to 3 passes. The first pass uses a conservative
464 * transfer length of 36 unless sdev->inquiry_len specifies a
465 * different value. */
466 first_inquiry_len
= sdev
->inquiry_len
? sdev
->inquiry_len
: 36;
467 try_inquiry_len
= first_inquiry_len
;
471 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO
, sdev
,
472 "scsi scan: INQUIRY pass %d length %d\n",
473 pass
, try_inquiry_len
));
475 /* Each pass gets up to three chances to ignore Unit Attention */
476 for (count
= 0; count
< 3; ++count
) {
477 memset(scsi_cmd
, 0, 6);
478 scsi_cmd
[0] = INQUIRY
;
479 scsi_cmd
[4] = (unsigned char) try_inquiry_len
;
481 memset(inq_result
, 0, try_inquiry_len
);
483 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
484 inq_result
, try_inquiry_len
, &sshdr
,
485 HZ
/ 2 + HZ
* scsi_inq_timeout
, 3);
487 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: INQUIRY %s "
489 result
? "failed" : "successful", 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(result
) & DRIVER_SENSE
) &&
499 scsi_sense_valid(&sshdr
)) {
500 if ((sshdr
.sense_key
== UNIT_ATTENTION
) &&
501 ((sshdr
.asc
== 0x28) ||
502 (sshdr
.asc
== 0x29)) &&
511 sanitize_inquiry_string(&inq_result
[8], 8);
512 sanitize_inquiry_string(&inq_result
[16], 16);
513 sanitize_inquiry_string(&inq_result
[32], 4);
515 response_len
= inq_result
[4] + 5;
516 if (response_len
> 255)
517 response_len
= first_inquiry_len
; /* sanity */
520 * Get any flags for this device.
522 * XXX add a bflags to scsi_device, and replace the
523 * corresponding bit fields in scsi_device, so bflags
524 * need not be passed as an argument.
526 *bflags
= scsi_get_device_flags(sdev
, &inq_result
[8],
529 /* When the first pass succeeds we gain information about
530 * what larger transfer lengths might work. */
532 if (BLIST_INQUIRY_36
& *bflags
)
533 next_inquiry_len
= 36;
534 else if (BLIST_INQUIRY_58
& *bflags
)
535 next_inquiry_len
= 58;
536 else if (sdev
->inquiry_len
)
537 next_inquiry_len
= sdev
->inquiry_len
;
539 next_inquiry_len
= response_len
;
541 /* If more data is available perform the second pass */
542 if (next_inquiry_len
> try_inquiry_len
) {
543 try_inquiry_len
= next_inquiry_len
;
549 } else if (pass
== 2) {
550 printk(KERN_INFO
"scsi scan: %d byte inquiry failed. "
551 "Consider BLIST_INQUIRY_36 for this device\n",
554 /* If this pass failed, the third pass goes back and transfers
555 * the same amount as we successfully got in the first pass. */
556 try_inquiry_len
= first_inquiry_len
;
561 /* If the last transfer attempt got an error, assume the
562 * peripheral doesn't exist or is dead. */
566 /* Don't report any more data than the device says is valid */
567 sdev
->inquiry_len
= min(try_inquiry_len
, response_len
);
570 * XXX Abort if the response length is less than 36? If less than
571 * 32, the lookup of the device flags (above) could be invalid,
572 * and it would be possible to take an incorrect action - we do
573 * not want to hang because of a short INQUIRY. On the flip side,
574 * if the device is spun down or becoming ready (and so it gives a
575 * short INQUIRY), an abort here prevents any further use of the
576 * device, including spin up.
578 * Related to the above issue:
580 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
581 * and if not ready, sent a START_STOP to start (maybe spin up) and
582 * then send the INQUIRY again, since the INQUIRY can change after
583 * a device is initialized.
585 * Ideally, start a device if explicitly asked to do so. This
586 * assumes that a device is spun up on power on, spun down on
587 * request, and then spun up on request.
591 * The scanning code needs to know the scsi_level, even if no
592 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
593 * non-zero LUNs can be scanned.
595 sdev
->scsi_level
= inq_result
[2] & 0x07;
596 if (sdev
->scsi_level
>= 2 ||
597 (sdev
->scsi_level
== 1 && (inq_result
[3] & 0x0f) == 1))
599 sdev
->sdev_target
->scsi_level
= sdev
->scsi_level
;
605 * scsi_add_lun - allocate and fully initialze a scsi_device
606 * @sdevscan: holds information to be stored in the new scsi_device
607 * @sdevnew: store the address of the newly allocated scsi_device
608 * @inq_result: holds the result of a previous INQUIRY to the LUN
609 * @bflags: black/white list flag
612 * Allocate and initialize a scsi_device matching sdevscan. Optionally
613 * set fields based on values in *@bflags. If @sdevnew is not
614 * NULL, store the address of the new scsi_device in *@sdevnew (needed
615 * when scanning a particular LUN).
618 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
619 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
621 static int scsi_add_lun(struct scsi_device
*sdev
, unsigned char *inq_result
,
625 * XXX do not save the inquiry, since it can change underneath us,
626 * save just vendor/model/rev.
628 * Rather than save it and have an ioctl that retrieves the saved
629 * value, have an ioctl that executes the same INQUIRY code used
630 * in scsi_probe_lun, let user level programs doing INQUIRY
631 * scanning run at their own risk, or supply a user level program
632 * that can correctly scan.
634 sdev
->inquiry
= kmalloc(sdev
->inquiry_len
, GFP_ATOMIC
);
635 if (sdev
->inquiry
== NULL
) {
636 return SCSI_SCAN_NO_RESPONSE
;
639 memcpy(sdev
->inquiry
, inq_result
, sdev
->inquiry_len
);
640 sdev
->vendor
= (char *) (sdev
->inquiry
+ 8);
641 sdev
->model
= (char *) (sdev
->inquiry
+ 16);
642 sdev
->rev
= (char *) (sdev
->inquiry
+ 32);
644 if (*bflags
& BLIST_ISROM
) {
646 * It would be better to modify sdev->type, and set
647 * sdev->removable; this can now be done since
648 * print_inquiry has gone away.
650 inq_result
[0] = TYPE_ROM
;
651 inq_result
[1] |= 0x80; /* removable */
652 } else if (*bflags
& BLIST_NO_ULD_ATTACH
)
653 sdev
->no_uld_attach
= 1;
655 switch (sdev
->type
= (inq_result
[0] & 0x1f)) {
662 case TYPE_MEDIUM_CHANGER
:
674 printk(KERN_INFO
"scsi: unknown device type %d\n", sdev
->type
);
678 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
679 * spec says: The device server is capable of supporting the
680 * specified peripheral device type on this logical unit. However,
681 * the physical device is not currently connected to this logical
684 * The above is vague, as it implies that we could treat 001 and
685 * 011 the same. Stay compatible with previous code, and create a
686 * scsi_device for a PQ of 1
688 * Don't set the device offline here; rather let the upper
689 * level drivers eval the PQ to decide whether they should
690 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
693 sdev
->inq_periph_qual
= (inq_result
[0] >> 5) & 7;
694 sdev
->removable
= (0x80 & inq_result
[1]) >> 7;
695 sdev
->lockable
= sdev
->removable
;
696 sdev
->soft_reset
= (inq_result
[7] & 1) && ((inq_result
[3] & 7) == 2);
698 if (sdev
->scsi_level
>= SCSI_3
|| (sdev
->inquiry_len
> 56 &&
699 inq_result
[56] & 0x04))
701 if (inq_result
[7] & 0x60)
703 if (inq_result
[7] & 0x10)
706 sdev_printk(KERN_NOTICE
, sdev
, "%s %.8s %.16s %.4s PQ: %d "
707 "ANSI: %d%s\n", scsi_device_type(sdev
->type
),
708 sdev
->vendor
, sdev
->model
, sdev
->rev
,
709 sdev
->inq_periph_qual
, inq_result
[2] & 0x07,
710 (inq_result
[3] & 0x0f) == 1 ? " CCS" : "");
716 if ((sdev
->scsi_level
>= SCSI_2
) && (inq_result
[7] & 2) &&
717 !(*bflags
& BLIST_NOTQ
))
718 sdev
->tagged_supported
= 1;
720 * Some devices (Texel CD ROM drives) have handshaking problems
721 * when used with the Seagate controllers. borken is initialized
722 * to 1, and then set it to 0 here.
724 if ((*bflags
& BLIST_BORKEN
) == 0)
728 * Apparently some really broken devices (contrary to the SCSI
729 * standards) need to be selected without asserting ATN
731 if (*bflags
& BLIST_SELECT_NO_ATN
)
732 sdev
->select_no_atn
= 1;
735 * Maximum 512 sector transfer length
736 * broken RA4x00 Compaq Disk Array
738 if (*bflags
& BLIST_MAX_512
)
739 blk_queue_max_sectors(sdev
->request_queue
, 512);
742 * Some devices may not want to have a start command automatically
743 * issued when a device is added.
745 if (*bflags
& BLIST_NOSTARTONADD
)
746 sdev
->no_start_on_add
= 1;
748 if (*bflags
& BLIST_SINGLELUN
)
749 sdev
->single_lun
= 1;
752 sdev
->use_10_for_rw
= 1;
754 if (*bflags
& BLIST_MS_SKIP_PAGE_08
)
755 sdev
->skip_ms_page_8
= 1;
757 if (*bflags
& BLIST_MS_SKIP_PAGE_3F
)
758 sdev
->skip_ms_page_3f
= 1;
760 if (*bflags
& BLIST_USE_10_BYTE_MS
)
761 sdev
->use_10_for_ms
= 1;
763 /* set the device running here so that slave configure
765 scsi_device_set_state(sdev
, SDEV_RUNNING
);
767 if (*bflags
& BLIST_MS_192_BYTES_FOR_3F
)
768 sdev
->use_192_bytes_for_3f
= 1;
770 if (*bflags
& BLIST_NOT_LOCKABLE
)
773 if (*bflags
& BLIST_RETRY_HWERROR
)
774 sdev
->retry_hwerror
= 1;
776 transport_configure_device(&sdev
->sdev_gendev
);
778 if (sdev
->host
->hostt
->slave_configure
) {
779 int ret
= sdev
->host
->hostt
->slave_configure(sdev
);
782 * if LLDD reports slave not present, don't clutter
783 * console with alloc failure messages
786 sdev_printk(KERN_ERR
, sdev
,
787 "failed to configure device\n");
789 return SCSI_SCAN_NO_RESPONSE
;
794 * Ok, the device is now all set up, we can
795 * register it and tell the rest of the kernel
798 if (scsi_sysfs_add_sdev(sdev
) != 0)
799 return SCSI_SCAN_NO_RESPONSE
;
801 return SCSI_SCAN_LUN_PRESENT
;
804 static inline void scsi_destroy_sdev(struct scsi_device
*sdev
)
806 scsi_device_set_state(sdev
, SDEV_DEL
);
807 if (sdev
->host
->hostt
->slave_destroy
)
808 sdev
->host
->hostt
->slave_destroy(sdev
);
809 transport_destroy_device(&sdev
->sdev_gendev
);
810 put_device(&sdev
->sdev_gendev
);
813 #ifdef CONFIG_SCSI_LOGGING
815 * scsi_inq_str - print INQUIRY data from min to max index,
816 * strip trailing whitespace
817 * @buf: Output buffer with at least end-first+1 bytes of space
818 * @inq: Inquiry buffer (input)
819 * @first: Offset of string into inq
820 * @end: Index after last character in inq
822 static unsigned char *scsi_inq_str(unsigned char *buf
, unsigned char *inq
,
823 unsigned first
, unsigned end
)
825 unsigned term
= 0, idx
;
827 for (idx
= 0; idx
+ first
< end
&& idx
+ first
< inq
[4] + 5; idx
++) {
828 if (inq
[idx
+first
] > ' ') {
829 buf
[idx
] = inq
[idx
+first
];
841 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
842 * @starget: pointer to target device structure
843 * @lun: LUN of target device
844 * @sdevscan: probe the LUN corresponding to this scsi_device
845 * @sdevnew: store the value of any new scsi_device allocated
846 * @bflagsp: store bflags here if not NULL
849 * Call scsi_probe_lun, if a LUN with an attached device is found,
850 * allocate and set it up by calling scsi_add_lun.
853 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
854 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
855 * attached at the LUN
856 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
858 static int scsi_probe_and_add_lun(struct scsi_target
*starget
,
859 uint lun
, int *bflagsp
,
860 struct scsi_device
**sdevp
, int rescan
,
863 struct scsi_device
*sdev
;
864 unsigned char *result
;
865 int bflags
, res
= SCSI_SCAN_NO_RESPONSE
, result_len
= 256;
866 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
869 * The rescan flag is used as an optimization, the first scan of a
870 * host adapter calls into here with rescan == 0.
872 sdev
= scsi_device_lookup_by_target(starget
, lun
);
874 if (rescan
|| sdev
->sdev_state
!= SDEV_CREATED
) {
875 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
876 "scsi scan: device exists on %s\n",
877 sdev
->sdev_gendev
.bus_id
));
881 scsi_device_put(sdev
);
884 *bflagsp
= scsi_get_device_flags(sdev
,
887 return SCSI_SCAN_LUN_PRESENT
;
889 scsi_device_put(sdev
);
891 sdev
= scsi_alloc_sdev(starget
, lun
, hostdata
);
895 result
= kmalloc(result_len
, GFP_ATOMIC
|
896 ((shost
->unchecked_isa_dma
) ? __GFP_DMA
: 0));
900 if (scsi_probe_lun(sdev
, result
, result_len
, &bflags
))
901 goto out_free_result
;
906 * result contains valid SCSI INQUIRY data.
908 if (((result
[0] >> 5) == 3) && !(bflags
& BLIST_ATTACH_PQ3
)) {
910 * For a Peripheral qualifier 3 (011b), the SCSI
911 * spec says: The device server is not capable of
912 * supporting a physical device on this logical
915 * For disks, this implies that there is no
916 * logical disk configured at sdev->lun, but there
917 * is a target id responding.
919 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO
, sdev
, "scsi scan:"
920 " peripheral qualifier of 3, device not"
923 SCSI_LOG_SCAN_BUS(1, {
924 unsigned char vend
[9];
925 unsigned char mod
[17];
927 sdev_printk(KERN_INFO
, sdev
,
928 "scsi scan: consider passing scsi_mod."
929 "dev_flags=%s:%s:0x240 or 0x800240\n",
930 scsi_inq_str(vend
, result
, 8, 16),
931 scsi_inq_str(mod
, result
, 16, 32));
935 res
= SCSI_SCAN_TARGET_PRESENT
;
936 goto out_free_result
;
940 * Some targets may set slight variations of PQ and PDT to signal
941 * that no LUN is present, so don't add sdev in these cases.
942 * Two specific examples are:
943 * 1) NetApp targets: return PQ=1, PDT=0x1f
944 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
945 * in the UFI 1.0 spec (we cannot rely on reserved bits).
948 * 1) SCSI SPC-3, pp. 145-146
949 * PQ=1: "A peripheral device having the specified peripheral
950 * device type is not connected to this logical unit. However, the
951 * device server is capable of supporting the specified peripheral
952 * device type on this logical unit."
953 * PDT=0x1f: "Unknown or no device type"
954 * 2) USB UFI 1.0, p. 20
955 * PDT=00h Direct-access device (floppy)
956 * PDT=1Fh none (no FDD connected to the requested logical unit)
958 if (((result
[0] >> 5) == 1 || starget
->pdt_1f_for_no_lun
) &&
959 (result
[0] & 0x1f) == 0x1f) {
960 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
961 "scsi scan: peripheral device type"
962 " of 31, no device added\n"));
963 res
= SCSI_SCAN_TARGET_PRESENT
;
964 goto out_free_result
;
967 res
= scsi_add_lun(sdev
, result
, &bflags
);
968 if (res
== SCSI_SCAN_LUN_PRESENT
) {
969 if (bflags
& BLIST_KEY
) {
971 scsi_unlock_floptical(sdev
, result
);
978 if (res
== SCSI_SCAN_LUN_PRESENT
) {
980 if (scsi_device_get(sdev
) == 0) {
983 __scsi_remove_device(sdev
);
984 res
= SCSI_SCAN_NO_RESPONSE
;
988 scsi_destroy_sdev(sdev
);
994 * scsi_sequential_lun_scan - sequentially scan a SCSI target
995 * @starget: pointer to target structure to scan
996 * @bflags: black/white list flag for LUN 0
999 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1000 * scanned) to some maximum lun until a LUN is found with no device
1001 * attached. Use the bflags to figure out any oddities.
1003 * Modifies sdevscan->lun.
1005 static void scsi_sequential_lun_scan(struct scsi_target
*starget
,
1006 int bflags
, int scsi_level
, int rescan
)
1008 unsigned int sparse_lun
, lun
, max_dev_lun
;
1009 struct Scsi_Host
*shost
= dev_to_shost(starget
->dev
.parent
);
1011 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
"scsi scan: Sequential scan of"
1012 "%s\n", starget
->dev
.bus_id
));
1014 max_dev_lun
= min(max_scsi_luns
, shost
->max_lun
);
1016 * If this device is known to support sparse multiple units,
1017 * override the other settings, and scan all of them. Normally,
1018 * SCSI-3 devices should be scanned via the REPORT LUNS.
1020 if (bflags
& BLIST_SPARSELUN
) {
1021 max_dev_lun
= shost
->max_lun
;
1027 * If less than SCSI_1_CSS, and no special lun scaning, stop
1028 * scanning; this matches 2.4 behaviour, but could just be a bug
1029 * (to continue scanning a SCSI_1_CSS device).
1031 * This test is broken. We might not have any device on lun0 for
1032 * a sparselun device, and if that's the case then how would we
1033 * know the real scsi_level, eh? It might make sense to just not
1034 * scan any SCSI_1 device for non-0 luns, but that check would best
1035 * go into scsi_alloc_sdev() and just have it return null when asked
1036 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1038 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1039 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1044 * If this device is known to support multiple units, override
1045 * the other settings, and scan all of them.
1047 if (bflags
& BLIST_FORCELUN
)
1048 max_dev_lun
= shost
->max_lun
;
1050 * REGAL CDC-4X: avoid hang after LUN 4
1052 if (bflags
& BLIST_MAX5LUN
)
1053 max_dev_lun
= min(5U, max_dev_lun
);
1055 * Do not scan SCSI-2 or lower device past LUN 7, unless
1058 if (scsi_level
< SCSI_3
&& !(bflags
& BLIST_LARGELUN
))
1059 max_dev_lun
= min(8U, max_dev_lun
);
1062 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1063 * until we reach the max, or no LUN is found and we are not
1066 for (lun
= 1; lun
< max_dev_lun
; ++lun
)
1067 if ((scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
,
1068 NULL
) != SCSI_SCAN_LUN_PRESENT
) &&
1074 * scsilun_to_int: convert a scsi_lun to an int
1075 * @scsilun: struct scsi_lun to be converted.
1078 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1079 * integer, and return the result. The caller must check for
1080 * truncation before using this function.
1083 * The struct scsi_lun is assumed to be four levels, with each level
1084 * effectively containing a SCSI byte-ordered (big endian) short; the
1085 * addressing bits of each level are ignored (the highest two bits).
1086 * For a description of the LUN format, post SCSI-3 see the SCSI
1087 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1089 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1090 * the integer: 0x0b030a04
1092 static int scsilun_to_int(struct scsi_lun
*scsilun
)
1098 for (i
= 0; i
< sizeof(lun
); i
+= 2)
1099 lun
= lun
| (((scsilun
->scsi_lun
[i
] << 8) |
1100 scsilun
->scsi_lun
[i
+ 1]) << (i
* 8));
1105 * int_to_scsilun: reverts an int into a scsi_lun
1106 * @int: integer to be reverted
1107 * @scsilun: struct scsi_lun to be set.
1110 * Reverts the functionality of the scsilun_to_int, which packed
1111 * an 8-byte lun value into an int. This routine unpacks the int
1112 * back into the lun value.
1113 * Note: the scsilun_to_int() routine does not truly handle all
1114 * 8bytes of the lun value. This functions restores only as much
1115 * as was set by the routine.
1118 * Given an integer : 0x0b030a04, this function returns a
1119 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1122 void int_to_scsilun(unsigned int lun
, struct scsi_lun
*scsilun
)
1126 memset(scsilun
->scsi_lun
, 0, sizeof(scsilun
->scsi_lun
));
1128 for (i
= 0; i
< sizeof(lun
); i
+= 2) {
1129 scsilun
->scsi_lun
[i
] = (lun
>> 8) & 0xFF;
1130 scsilun
->scsi_lun
[i
+1] = lun
& 0xFF;
1134 EXPORT_SYMBOL(int_to_scsilun
);
1137 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1138 * @sdevscan: scan the host, channel, and id of this scsi_device
1141 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1142 * command, and scan the resulting list of LUNs by calling
1143 * scsi_probe_and_add_lun.
1145 * Modifies sdevscan->lun.
1148 * 0: scan completed (or no memory, so further scanning is futile)
1149 * 1: no report lun scan, or not configured
1151 static int scsi_report_lun_scan(struct scsi_target
*starget
, int bflags
,
1155 unsigned char scsi_cmd
[MAX_COMMAND_SIZE
];
1156 unsigned int length
;
1158 unsigned int num_luns
;
1159 unsigned int retries
;
1161 struct scsi_lun
*lunp
, *lun_data
;
1163 struct scsi_sense_hdr sshdr
;
1164 struct scsi_device
*sdev
;
1165 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
1169 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1170 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1171 * support more than 8 LUNs.
1173 if (bflags
& BLIST_NOREPORTLUN
)
1175 if (starget
->scsi_level
< SCSI_2
&&
1176 starget
->scsi_level
!= SCSI_UNKNOWN
)
1178 if (starget
->scsi_level
< SCSI_3
&&
1179 (!(bflags
& BLIST_REPORTLUN2
) || shost
->max_lun
<= 8))
1181 if (bflags
& BLIST_NOLUN
)
1184 if (!(sdev
= scsi_device_lookup_by_target(starget
, 0))) {
1185 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1188 if (scsi_device_get(sdev
))
1192 sprintf(devname
, "host %d channel %d id %d",
1193 shost
->host_no
, sdev
->channel
, sdev
->id
);
1196 * Allocate enough to hold the header (the same size as one scsi_lun)
1197 * plus the max number of luns we are requesting.
1199 * Reallocating and trying again (with the exact amount we need)
1200 * would be nice, but then we need to somehow limit the size
1201 * allocated based on the available memory and the limits of
1202 * kmalloc - we don't want a kmalloc() failure of a huge value to
1203 * prevent us from finding any LUNs on this target.
1205 length
= (max_scsi_report_luns
+ 1) * sizeof(struct scsi_lun
);
1206 lun_data
= kmalloc(length
, GFP_ATOMIC
|
1207 (sdev
->host
->unchecked_isa_dma
? __GFP_DMA
: 0));
1209 printk(ALLOC_FAILURE_MSG
, __FUNCTION__
);
1213 scsi_cmd
[0] = REPORT_LUNS
;
1216 * bytes 1 - 5: reserved, set to zero.
1218 memset(&scsi_cmd
[1], 0, 5);
1221 * bytes 6 - 9: length of the command.
1223 scsi_cmd
[6] = (unsigned char) (length
>> 24) & 0xff;
1224 scsi_cmd
[7] = (unsigned char) (length
>> 16) & 0xff;
1225 scsi_cmd
[8] = (unsigned char) (length
>> 8) & 0xff;
1226 scsi_cmd
[9] = (unsigned char) length
& 0xff;
1228 scsi_cmd
[10] = 0; /* reserved */
1229 scsi_cmd
[11] = 0; /* control */
1232 * We can get a UNIT ATTENTION, for example a power on/reset, so
1233 * retry a few times (like sd.c does for TEST UNIT READY).
1234 * Experience shows some combinations of adapter/devices get at
1235 * least two power on/resets.
1237 * Illegal requests (for devices that do not support REPORT LUNS)
1238 * should come through as a check condition, and will not generate
1241 for (retries
= 0; retries
< 3; retries
++) {
1242 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: Sending"
1243 " REPORT LUNS to %s (try %d)\n", devname
,
1246 result
= scsi_execute_req(sdev
, scsi_cmd
, DMA_FROM_DEVICE
,
1247 lun_data
, length
, &sshdr
,
1248 SCSI_TIMEOUT
+ 4 * HZ
, 3);
1250 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO
"scsi scan: REPORT LUNS"
1251 " %s (try %d) result 0x%x\n", result
1252 ? "failed" : "successful", retries
, result
));
1255 else if (scsi_sense_valid(&sshdr
)) {
1256 if (sshdr
.sense_key
!= UNIT_ATTENTION
)
1263 * The device probably does not support a REPORT LUN command
1270 * Get the length from the first four bytes of lun_data.
1272 data
= (u8
*) lun_data
->scsi_lun
;
1273 length
= ((data
[0] << 24) | (data
[1] << 16) |
1274 (data
[2] << 8) | (data
[3] << 0));
1276 num_luns
= (length
/ sizeof(struct scsi_lun
));
1277 if (num_luns
> max_scsi_report_luns
) {
1278 printk(KERN_WARNING
"scsi: On %s only %d (max_scsi_report_luns)"
1279 " of %d luns reported, try increasing"
1280 " max_scsi_report_luns.\n", devname
,
1281 max_scsi_report_luns
, num_luns
);
1282 num_luns
= max_scsi_report_luns
;
1285 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO
, sdev
,
1286 "scsi scan: REPORT LUN scan\n"));
1289 * Scan the luns in lun_data. The entry at offset 0 is really
1290 * the header, so start at 1 and go up to and including num_luns.
1292 for (lunp
= &lun_data
[1]; lunp
<= &lun_data
[num_luns
]; lunp
++) {
1293 lun
= scsilun_to_int(lunp
);
1296 * Check if the unused part of lunp is non-zero, and so
1297 * does not fit in lun.
1299 if (memcmp(&lunp
->scsi_lun
[sizeof(lun
)], "\0\0\0\0", 4)) {
1303 * Output an error displaying the LUN in byte order,
1304 * this differs from what linux would print for the
1305 * integer LUN value.
1307 printk(KERN_WARNING
"scsi: %s lun 0x", devname
);
1308 data
= (char *)lunp
->scsi_lun
;
1309 for (i
= 0; i
< sizeof(struct scsi_lun
); i
++)
1310 printk("%02x", data
[i
]);
1311 printk(" has a LUN larger than currently supported.\n");
1312 } else if (lun
> sdev
->host
->max_lun
) {
1313 printk(KERN_WARNING
"scsi: %s lun%d has a LUN larger"
1314 " than allowed by the host adapter\n",
1319 res
= scsi_probe_and_add_lun(starget
,
1320 lun
, NULL
, NULL
, rescan
, NULL
);
1321 if (res
== SCSI_SCAN_NO_RESPONSE
) {
1323 * Got some results, but now none, abort.
1325 sdev_printk(KERN_ERR
, sdev
,
1326 "Unexpected response"
1327 " from lun %d while scanning, scan"
1337 scsi_device_put(sdev
);
1338 if (sdev
->sdev_state
== SDEV_CREATED
)
1340 * the sdev we used didn't appear in the report luns scan
1342 scsi_destroy_sdev(sdev
);
1346 struct scsi_device
*__scsi_add_device(struct Scsi_Host
*shost
, uint channel
,
1347 uint id
, uint lun
, void *hostdata
)
1349 struct scsi_device
*sdev
= ERR_PTR(-ENODEV
);
1350 struct device
*parent
= &shost
->shost_gendev
;
1351 struct scsi_target
*starget
;
1353 starget
= scsi_alloc_target(parent
, channel
, id
);
1355 return ERR_PTR(-ENOMEM
);
1357 mutex_lock(&shost
->scan_mutex
);
1358 if (scsi_host_scan_allowed(shost
))
1359 scsi_probe_and_add_lun(starget
, lun
, NULL
, &sdev
, 1, hostdata
);
1360 mutex_unlock(&shost
->scan_mutex
);
1361 scsi_target_reap(starget
);
1362 put_device(&starget
->dev
);
1366 EXPORT_SYMBOL(__scsi_add_device
);
1368 int scsi_add_device(struct Scsi_Host
*host
, uint channel
,
1369 uint target
, uint lun
)
1371 struct scsi_device
*sdev
=
1372 __scsi_add_device(host
, channel
, target
, lun
, NULL
);
1374 return PTR_ERR(sdev
);
1376 scsi_device_put(sdev
);
1379 EXPORT_SYMBOL(scsi_add_device
);
1381 void scsi_rescan_device(struct device
*dev
)
1383 struct scsi_driver
*drv
;
1388 drv
= to_scsi_driver(dev
->driver
);
1389 if (try_module_get(drv
->owner
)) {
1392 module_put(drv
->owner
);
1395 EXPORT_SYMBOL(scsi_rescan_device
);
1397 static void __scsi_scan_target(struct device
*parent
, unsigned int channel
,
1398 unsigned int id
, unsigned int lun
, int rescan
)
1400 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1403 struct scsi_target
*starget
;
1405 if (shost
->this_id
== id
)
1407 * Don't scan the host adapter
1411 starget
= scsi_alloc_target(parent
, channel
, id
);
1415 if (lun
!= SCAN_WILD_CARD
) {
1417 * Scan for a specific host/chan/id/lun.
1419 scsi_probe_and_add_lun(starget
, lun
, NULL
, NULL
, rescan
, NULL
);
1424 * Scan LUN 0, if there is some response, scan further. Ideally, we
1425 * would not configure LUN 0 until all LUNs are scanned.
1427 res
= scsi_probe_and_add_lun(starget
, 0, &bflags
, NULL
, rescan
, NULL
);
1428 if (res
== SCSI_SCAN_LUN_PRESENT
|| res
== SCSI_SCAN_TARGET_PRESENT
) {
1429 if (scsi_report_lun_scan(starget
, bflags
, rescan
) != 0)
1431 * The REPORT LUN did not scan the target,
1432 * do a sequential scan.
1434 scsi_sequential_lun_scan(starget
, bflags
,
1435 starget
->scsi_level
, rescan
);
1439 /* now determine if the target has any children at all
1440 * and if not, nuke it */
1441 scsi_target_reap(starget
);
1443 put_device(&starget
->dev
);
1447 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1449 * @parent: host to scan
1450 * @channel: channel to scan
1451 * @id: target id to scan
1452 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1453 * @rescan: passed to LUN scanning routines
1456 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1457 * and possibly all LUNs on the target id.
1459 * First try a REPORT LUN scan, if that does not scan the target, do a
1460 * sequential scan of LUNs on the target id.
1462 void scsi_scan_target(struct device
*parent
, unsigned int channel
,
1463 unsigned int id
, unsigned int lun
, int rescan
)
1465 struct Scsi_Host
*shost
= dev_to_shost(parent
);
1467 mutex_lock(&shost
->scan_mutex
);
1468 if (scsi_host_scan_allowed(shost
))
1469 __scsi_scan_target(parent
, channel
, id
, lun
, rescan
);
1470 mutex_unlock(&shost
->scan_mutex
);
1472 EXPORT_SYMBOL(scsi_scan_target
);
1474 static void scsi_scan_channel(struct Scsi_Host
*shost
, unsigned int channel
,
1475 unsigned int id
, unsigned int lun
, int rescan
)
1479 if (id
== SCAN_WILD_CARD
)
1480 for (id
= 0; id
< shost
->max_id
; ++id
) {
1482 * XXX adapter drivers when possible (FCP, iSCSI)
1483 * could modify max_id to match the current max,
1484 * not the absolute max.
1486 * XXX add a shost id iterator, so for example,
1487 * the FC ID can be the same as a target id
1488 * without a huge overhead of sparse id's.
1490 if (shost
->reverse_ordering
)
1492 * Scan from high to low id.
1494 order_id
= shost
->max_id
- id
- 1;
1497 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1498 order_id
, lun
, rescan
);
1501 __scsi_scan_target(&shost
->shost_gendev
, channel
,
1505 int scsi_scan_host_selected(struct Scsi_Host
*shost
, unsigned int channel
,
1506 unsigned int id
, unsigned int lun
, int rescan
)
1508 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO
, shost
,
1510 __FUNCTION__
, channel
, id
, lun
));
1512 if (((channel
!= SCAN_WILD_CARD
) && (channel
> shost
->max_channel
)) ||
1513 ((id
!= SCAN_WILD_CARD
) && (id
>= shost
->max_id
)) ||
1514 ((lun
!= SCAN_WILD_CARD
) && (lun
> shost
->max_lun
)))
1517 mutex_lock(&shost
->scan_mutex
);
1518 if (scsi_host_scan_allowed(shost
)) {
1519 if (channel
== SCAN_WILD_CARD
)
1520 for (channel
= 0; channel
<= shost
->max_channel
;
1522 scsi_scan_channel(shost
, channel
, id
, lun
,
1525 scsi_scan_channel(shost
, channel
, id
, lun
, rescan
);
1527 mutex_unlock(&shost
->scan_mutex
);
1533 * scsi_scan_host - scan the given adapter
1534 * @shost: adapter to scan
1536 void scsi_scan_host(struct Scsi_Host
*shost
)
1538 scsi_scan_host_selected(shost
, SCAN_WILD_CARD
, SCAN_WILD_CARD
,
1541 EXPORT_SYMBOL(scsi_scan_host
);
1543 void scsi_forget_host(struct Scsi_Host
*shost
)
1545 struct scsi_device
*sdev
;
1546 unsigned long flags
;
1549 spin_lock_irqsave(shost
->host_lock
, flags
);
1550 list_for_each_entry(sdev
, &shost
->__devices
, siblings
) {
1551 if (sdev
->sdev_state
== SDEV_DEL
)
1553 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1554 __scsi_remove_device(sdev
);
1557 spin_unlock_irqrestore(shost
->host_lock
, flags
);
1561 * Function: scsi_get_host_dev()
1563 * Purpose: Create a scsi_device that points to the host adapter itself.
1565 * Arguments: SHpnt - Host that needs a scsi_device
1567 * Lock status: None assumed.
1569 * Returns: The scsi_device or NULL
1572 * Attach a single scsi_device to the Scsi_Host - this should
1573 * be made to look like a "pseudo-device" that points to the
1576 * Note - this device is not accessible from any high-level
1577 * drivers (including generics), which is probably not
1578 * optimal. We can add hooks later to attach
1580 struct scsi_device
*scsi_get_host_dev(struct Scsi_Host
*shost
)
1582 struct scsi_device
*sdev
= NULL
;
1583 struct scsi_target
*starget
;
1585 mutex_lock(&shost
->scan_mutex
);
1586 if (!scsi_host_scan_allowed(shost
))
1588 starget
= scsi_alloc_target(&shost
->shost_gendev
, 0, shost
->this_id
);
1592 sdev
= scsi_alloc_sdev(starget
, 0, NULL
);
1594 sdev
->sdev_gendev
.parent
= get_device(&starget
->dev
);
1597 scsi_target_reap(starget
);
1598 put_device(&starget
->dev
);
1600 mutex_unlock(&shost
->scan_mutex
);
1603 EXPORT_SYMBOL(scsi_get_host_dev
);
1606 * Function: scsi_free_host_dev()
1608 * Purpose: Free a scsi_device that points to the host adapter itself.
1610 * Arguments: SHpnt - Host that needs a scsi_device
1612 * Lock status: None assumed.
1618 void scsi_free_host_dev(struct scsi_device
*sdev
)
1620 BUG_ON(sdev
->id
!= sdev
->host
->this_id
);
1622 scsi_destroy_sdev(sdev
);
1624 EXPORT_SYMBOL(scsi_free_host_dev
);