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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * scsi_scan.c
3 *
4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
6 *
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.
10 *
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
Christoph Hellwigf64a1812005-10-31 18:32:08 +010012 * device attached, a scsi_device is allocated and setup for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
14 * For every id of every channel on the given host:
15 *
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
18 *
19 * If LUN 0 has a device attached, allocate and setup a
Christoph Hellwigf64a1812005-10-31 18:32:08 +010020 * scsi_device for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 *
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.
26 */
27
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>
34
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>
43
44#include "scsi_priv.h"
45#include "scsi_logging.h"
46
47#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
48 " SCSI scanning, some SCSI devices might not be configured\n"
49
50/*
51 * Default timeout
52 */
53#define SCSI_TIMEOUT (2*HZ)
54
55/*
56 * Prefix values for the SCSI id's (stored in driverfs name field)
57 */
58#define SCSI_UID_SER_NUM 'S'
59#define SCSI_UID_UNKNOWN 'Z'
60
61/*
62 * Return values of some of the scanning functions.
63 *
64 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
65 * includes allocation or general failures preventing IO from being sent.
66 *
67 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
68 * on the given LUN.
69 *
70 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
71 * given LUN.
72 */
73#define SCSI_SCAN_NO_RESPONSE 0
74#define SCSI_SCAN_TARGET_PRESENT 1
75#define SCSI_SCAN_LUN_PRESENT 2
76
Arjan van de Ven0ad78202005-11-28 16:22:25 +010077static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79#define MAX_SCSI_LUNS 512
80
81#ifdef CONFIG_SCSI_MULTI_LUN
82static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
83#else
84static unsigned int max_scsi_luns = 1;
85#endif
86
87module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR);
88MODULE_PARM_DESC(max_luns,
89 "last scsi LUN (should be between 1 and 2^32-1)");
90
91/*
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
96 * is about 16k.
97 */
98static unsigned int max_scsi_report_luns = 511;
99
100module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR);
101MODULE_PARM_DESC(max_report_luns,
102 "REPORT LUNS maximum number of LUNS received (should be"
103 " between 1 and 16384)");
104
105static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
106
107module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR);
108MODULE_PARM_DESC(inq_timeout,
109 "Timeout (in seconds) waiting for devices to answer INQUIRY."
110 " Default is 5. Some non-compliant devices need more.");
111
112/**
113 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500114 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 * @result: area to store the result of the MODE SENSE
116 *
117 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500118 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 * Called for BLIST_KEY devices.
120 **/
James Bottomley39216032005-06-15 18:48:29 -0500121static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 unsigned char *result)
123{
124 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
125
126 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
127 scsi_cmd[0] = MODE_SENSE;
128 scsi_cmd[1] = 0;
129 scsi_cmd[2] = 0x2e;
130 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500131 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500133 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
134 SCSI_TIMEOUT, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135}
136
137/**
138 * print_inquiry - printk the inquiry information
139 * @inq_result: printk this SCSI INQUIRY
140 *
141 * Description:
142 * printk the vendor, model, and other information found in the
143 * INQUIRY data in @inq_result.
144 *
145 * Notes:
146 * Remove this, and replace with a hotplug event that logs any
147 * relevant information.
148 **/
149static void print_inquiry(unsigned char *inq_result)
150{
151 int i;
152
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]);
157 else
158 printk(" ");
159
160 printk(" Model: ");
161 for (i = 16; i < 32; i++)
162 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
163 printk("%c", inq_result[i]);
164 else
165 printk(" ");
166
167 printk(" Rev: ");
168 for (i = 32; i < 36; i++)
169 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5)
170 printk("%c", inq_result[i]);
171 else
172 printk(" ");
173
174 printk("\n");
175
176 i = inq_result[0] & 0x1f;
177
178 printk(KERN_NOTICE " Type: %s ",
179 i <
180 MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] :
181 "Unknown ");
182 printk(" ANSI SCSI revision: %02x",
183 inq_result[2] & 0x07);
184 if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1)
185 printk(" CCS\n");
186 else
187 printk("\n");
188}
189
190/**
191 * scsi_alloc_sdev - allocate and setup a scsi_Device
192 *
193 * Description:
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.
197 *
198 * Return value:
199 * scsi_Device pointer, or NULL on failure.
200 **/
201static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
202 unsigned int lun, void *hostdata)
203{
204 struct scsi_device *sdev;
205 int display_failure_msg = 1, ret;
206 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
207
Jes Sorensen24669f752006-01-16 10:31:18 -0500208 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 GFP_ATOMIC);
210 if (!sdev)
211 goto out;
212
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 sdev->vendor = scsi_null_device_strs;
214 sdev->model = scsi_null_device_strs;
215 sdev->rev = scsi_null_device_strs;
216 sdev->host = shost;
217 sdev->id = starget->id;
218 sdev->lun = lun;
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);
226
227 sdev->sdev_gendev.parent = get_device(&starget->dev);
228 sdev->sdev_target = starget;
229
230 /* usually NULL and set by ->slave_alloc instead */
231 sdev->hostdata = hostdata;
232
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;
236
237 /*
238 * Some low level driver could use device->type
239 */
240 sdev->type = -1;
241
242 /*
243 * Assume that the device will have handshaking problems,
244 * and then fix this field later if it turns out it
245 * doesn't
246 */
247 sdev->borken = 1;
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 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);
Dave Jones93f560892006-03-09 10:21:27 -0500254 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 goto out;
256 }
257
258 sdev->request_queue->queuedata = sdev;
259 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
260
261 scsi_sysfs_device_initialize(sdev);
262
263 if (shost->hostt->slave_alloc) {
264 ret = shost->hostt->slave_alloc(sdev);
265 if (ret) {
266 /*
267 * if LLDD reports slave not present, don't clutter
268 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 */
270 if (ret == -ENXIO)
271 display_failure_msg = 0;
272 goto out_device_destroy;
273 }
274 }
275
276 return sdev;
277
278out_device_destroy:
279 transport_destroy_device(&sdev->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 put_device(&sdev->sdev_gendev);
281out:
282 if (display_failure_msg)
283 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
284 return NULL;
285}
286
287static void scsi_target_dev_release(struct device *dev)
288{
289 struct device *parent = dev->parent;
290 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 kfree(starget);
293 put_device(parent);
294}
295
296int scsi_is_target_device(const struct device *dev)
297{
298 return dev->release == scsi_target_dev_release;
299}
300EXPORT_SYMBOL(scsi_is_target_device);
301
302static struct scsi_target *__scsi_find_target(struct device *parent,
303 int channel, uint id)
304{
305 struct scsi_target *starget, *found_starget = NULL;
306 struct Scsi_Host *shost = dev_to_shost(parent);
307 /*
308 * Search for an existing target for this sdev.
309 */
310 list_for_each_entry(starget, &shost->__targets, siblings) {
311 if (starget->id == id &&
312 starget->channel == channel) {
313 found_starget = starget;
314 break;
315 }
316 }
317 if (found_starget)
318 get_device(&found_starget->dev);
319
320 return found_starget;
321}
322
323static struct scsi_target *scsi_alloc_target(struct device *parent,
324 int channel, uint id)
325{
326 struct Scsi_Host *shost = dev_to_shost(parent);
327 struct device *dev = NULL;
328 unsigned long flags;
329 const int size = sizeof(struct scsi_target)
330 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400331 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600333 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Jes Sorensen24669f752006-01-16 10:31:18 -0500335 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 if (!starget) {
337 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
338 return NULL;
339 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 dev = &starget->dev;
341 device_initialize(dev);
342 starget->reap_ref = 1;
343 dev->parent = get_device(parent);
344 dev->release = scsi_target_dev_release;
345 sprintf(dev->bus_id, "target%d:%d:%d",
346 shost->host_no, channel, id);
347 starget->id = id;
348 starget->channel = channel;
349 INIT_LIST_HEAD(&starget->siblings);
350 INIT_LIST_HEAD(&starget->devices);
James Bottomleyffedb452006-02-23 14:27:18 -0600351 starget->state = STARGET_RUNNING;
352 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 spin_lock_irqsave(shost->host_lock, flags);
354
355 found_target = __scsi_find_target(parent, channel, id);
356 if (found_target)
357 goto found;
358
359 list_add_tail(&starget->siblings, &shost->__targets);
360 spin_unlock_irqrestore(shost->host_lock, flags);
361 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500362 transport_setup_device(dev);
Brian King32f95792006-02-22 14:28:24 -0600363 error = device_add(dev);
364 if (error) {
365 dev_err(dev, "target device_add failed, error %d\n", error);
366 spin_lock_irqsave(shost->host_lock, flags);
367 list_del_init(&starget->siblings);
368 spin_unlock_irqrestore(shost->host_lock, flags);
369 transport_destroy_device(dev);
370 put_device(parent);
371 kfree(starget);
372 return NULL;
373 }
James Bottomleya283bd32005-05-24 12:06:38 -0500374 transport_add_device(dev);
375 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600376 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500377
378 if(error) {
379 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
380 /* don't want scsi_target_reap to do the final
381 * put because it will be under the host lock */
382 get_device(dev);
383 scsi_target_reap(starget);
384 put_device(dev);
385 return NULL;
386 }
387 }
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return starget;
390
391 found:
392 found_target->reap_ref++;
393 spin_unlock_irqrestore(shost->host_lock, flags);
394 put_device(parent);
James Bottomleyffedb452006-02-23 14:27:18 -0600395 if (found_target->state != STARGET_DEL) {
396 kfree(starget);
397 return found_target;
398 }
399 /* Unfortunately, we found a dying target; need to
400 * wait until it's dead before we can get a new one */
401 put_device(&found_target->dev);
402 flush_scheduled_work();
403 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404}
405
James Bottomley65110b22006-02-14 10:48:46 -0600406static void scsi_target_reap_usercontext(void *data)
407{
408 struct scsi_target *starget = data;
James Bottomley863a9302005-12-15 20:01:43 -0800409 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
410 unsigned long flags;
411
James Bottomleyffedb452006-02-23 14:27:18 -0600412 transport_remove_device(&starget->dev);
413 device_del(&starget->dev);
414 transport_destroy_device(&starget->dev);
James Bottomley863a9302005-12-15 20:01:43 -0800415 spin_lock_irqsave(shost->host_lock, flags);
Mike Andersona50a5e32006-03-14 11:18:46 -0800416 if (shost->hostt->target_destroy)
417 shost->hostt->target_destroy(starget);
James Bottomleyffedb452006-02-23 14:27:18 -0600418 list_del_init(&starget->siblings);
James Bottomley863a9302005-12-15 20:01:43 -0800419 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600420 put_device(&starget->dev);
James Bottomley863a9302005-12-15 20:01:43 -0800421}
422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423/**
424 * scsi_target_reap - check to see if target is in use and destroy if not
425 *
426 * @starget: target to be checked
427 *
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
430 * it if so.
431 */
432void scsi_target_reap(struct scsi_target *starget)
433{
James Bottomleyffedb452006-02-23 14:27:18 -0600434 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
435 unsigned long flags;
436
437 spin_lock_irqsave(shost->host_lock, flags);
438
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);
445 return;
446
447 }
448 spin_unlock_irqrestore(shost->host_lock, flags);
449
450 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451}
452
453/**
454 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500455 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500457 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 * @bflags: store any bflags found here
459 *
460 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500461 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 *
James Bottomley39216032005-06-15 18:48:29 -0500463 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100465 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 **/
James Bottomley39216032005-06-15 18:48:29 -0500467static int scsi_probe_lun(struct scsi_device *sdev, char *inq_result,
468 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
471 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
472 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500473 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 struct scsi_sense_hdr sshdr;
475
476 *bflags = 0;
477
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;
483 pass = 1;
484
485 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500486 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
487 "scsi scan: INQUIRY pass %d length %d\n",
488 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
496 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500497
498 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500499 inq_result, try_inquiry_len, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -0500500 HZ / 2 + HZ * scsi_inq_timeout, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
502 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
503 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500504 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
James Bottomley39216032005-06-15 18:48:29 -0500506 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 /*
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.
512 */
James Bottomley39216032005-06-15 18:48:29 -0500513 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500514 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 if ((sshdr.sense_key == UNIT_ATTENTION) &&
516 ((sshdr.asc == 0x28) ||
517 (sshdr.asc == 0x29)) &&
518 (sshdr.ascq == 0))
519 continue;
520 }
521 }
522 break;
523 }
524
James Bottomley39216032005-06-15 18:48:29 -0500525 if (result == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 response_len = (unsigned char) inq_result[4] + 5;
527 if (response_len > 255)
528 response_len = first_inquiry_len; /* sanity */
529
530 /*
531 * Get any flags for this device.
532 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100533 * XXX add a bflags to scsi_device, and replace the
534 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 * need not be passed as an argument.
536 */
537 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
538 &inq_result[16]);
539
540 /* When the first pass succeeds we gain information about
541 * what larger transfer lengths might work. */
542 if (pass == 1) {
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;
549 else
550 next_inquiry_len = response_len;
551
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;
555 pass = 2;
556 goto next_pass;
557 }
558 }
559
560 } else if (pass == 2) {
561 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
562 "Consider BLIST_INQUIRY_36 for this device\n",
563 try_inquiry_len);
564
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;
568 pass = 3;
569 goto next_pass;
570 }
571
572 /* If the last transfer attempt got an error, assume the
573 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500574 if (result)
575 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
577 /* Don't report any more data than the device says is valid */
578 sdev->inquiry_len = min(try_inquiry_len, response_len);
579
580 /*
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.
588 *
589 * Related to the above issue:
590 *
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.
595 *
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.
599 */
600
601 /*
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.
605 */
606 sdev->scsi_level = inq_result[2] & 0x07;
607 if (sdev->scsi_level >= 2 ||
608 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
609 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500610 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
James Bottomley39216032005-06-15 18:48:29 -0500612 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613}
614
615/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100616 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 * @inq_result: holds the result of a previous INQUIRY to the LUN
620 * @bflags: black/white list flag
621 *
622 * Description:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100623 * Allocate and initialize a scsi_device matching sdevscan. Optionally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 * set fields based on values in *@bflags. If @sdevnew is not
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100625 * NULL, store the address of the new scsi_device in *@sdevnew (needed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 * when scanning a particular LUN).
627 *
628 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100629 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 **/
632static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
633{
634 /*
635 * XXX do not save the inquiry, since it can change underneath us,
636 * save just vendor/model/rev.
637 *
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.
643 */
644 sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC);
645 if (sdev->inquiry == NULL) {
646 return SCSI_SCAN_NO_RESPONSE;
647 }
648
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);
653
654 if (*bflags & BLIST_ISROM) {
655 /*
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.
660 */
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;
665
666 switch (sdev->type = (inq_result[0] & 0x1f)) {
667 case TYPE_TAPE:
668 case TYPE_DISK:
669 case TYPE_PRINTER:
670 case TYPE_MOD:
671 case TYPE_PROCESSOR:
672 case TYPE_SCANNER:
673 case TYPE_MEDIUM_CHANGER:
674 case TYPE_ENCLOSURE:
675 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600676 case TYPE_RAID:
Al Viro 631e8a12005-05-16 01:59:55 +0100677 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 sdev->writeable = 1;
679 break;
680 case TYPE_WORM:
681 case TYPE_ROM:
682 sdev->writeable = 0;
683 break;
684 default:
685 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
686 }
687
688 print_inquiry(inq_result);
689
690 /*
691 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
692 * spec says: The device server is capable of supporting the
693 * specified peripheral device type on this logical unit. However,
694 * the physical device is not currently connected to this logical
695 * unit.
696 *
697 * The above is vague, as it implies that we could treat 001 and
698 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100699 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 *
701 * Don't set the device offline here; rather let the upper
702 * level drivers eval the PQ to decide whether they should
703 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
704 */
705
706 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
707 sdev->removable = (0x80 & inq_result[1]) >> 7;
708 sdev->lockable = sdev->removable;
709 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
710
711 if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 &&
712 inq_result[56] & 0x04))
713 sdev->ppr = 1;
714 if (inq_result[7] & 0x60)
715 sdev->wdtr = 1;
716 if (inq_result[7] & 0x10)
717 sdev->sdtr = 1;
718
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 /*
Greg KH5e3c34c2006-01-18 16:17:46 -0800720 * End sysfs code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 */
722
723 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
724 !(*bflags & BLIST_NOTQ))
725 sdev->tagged_supported = 1;
726 /*
727 * Some devices (Texel CD ROM drives) have handshaking problems
728 * when used with the Seagate controllers. borken is initialized
729 * to 1, and then set it to 0 here.
730 */
731 if ((*bflags & BLIST_BORKEN) == 0)
732 sdev->borken = 0;
733
734 /*
735 * Apparently some really broken devices (contrary to the SCSI
736 * standards) need to be selected without asserting ATN
737 */
738 if (*bflags & BLIST_SELECT_NO_ATN)
739 sdev->select_no_atn = 1;
740
741 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600742 * Maximum 512 sector transfer length
743 * broken RA4x00 Compaq Disk Array
744 */
745 if (*bflags & BLIST_MAX_512)
746 blk_queue_max_sectors(sdev->request_queue, 512);
747
748 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 * Some devices may not want to have a start command automatically
750 * issued when a device is added.
751 */
752 if (*bflags & BLIST_NOSTARTONADD)
753 sdev->no_start_on_add = 1;
754
755 if (*bflags & BLIST_SINGLELUN)
756 sdev->single_lun = 1;
757
758
759 sdev->use_10_for_rw = 1;
760
761 if (*bflags & BLIST_MS_SKIP_PAGE_08)
762 sdev->skip_ms_page_8 = 1;
763
764 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
765 sdev->skip_ms_page_3f = 1;
766
767 if (*bflags & BLIST_USE_10_BYTE_MS)
768 sdev->use_10_for_ms = 1;
769
770 /* set the device running here so that slave configure
771 * may do I/O */
772 scsi_device_set_state(sdev, SDEV_RUNNING);
773
774 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
775 sdev->use_192_bytes_for_3f = 1;
776
777 if (*bflags & BLIST_NOT_LOCKABLE)
778 sdev->lockable = 0;
779
780 if (*bflags & BLIST_RETRY_HWERROR)
781 sdev->retry_hwerror = 1;
782
783 transport_configure_device(&sdev->sdev_gendev);
784
Christoph Hellwig93805092006-02-17 12:11:29 +0100785 if (sdev->host->hostt->slave_configure) {
786 int ret = sdev->host->hostt->slave_configure(sdev);
787 if (ret) {
788 /*
789 * if LLDD reports slave not present, don't clutter
790 * console with alloc failure messages
791 */
792 if (ret != -ENXIO) {
793 sdev_printk(KERN_ERR, sdev,
794 "failed to configure device\n");
795 }
796 return SCSI_SCAN_NO_RESPONSE;
797 }
798 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
800 /*
801 * Ok, the device is now all set up, we can
802 * register it and tell the rest of the kernel
803 * about it.
804 */
Alan Sternb24b1032005-07-27 11:43:46 -0700805 if (scsi_sysfs_add_sdev(sdev) != 0)
806 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
808 return SCSI_SCAN_LUN_PRESENT;
809}
810
James Bottomley6f3a2022005-09-22 20:33:28 -0500811static inline void scsi_destroy_sdev(struct scsi_device *sdev)
812{
813 if (sdev->host->hostt->slave_destroy)
814 sdev->host->hostt->slave_destroy(sdev);
815 transport_destroy_device(&sdev->sdev_gendev);
816 put_device(&sdev->sdev_gendev);
817}
818
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700819#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200820/**
821 * scsi_inq_str - print INQUIRY data from min to max index,
822 * strip trailing whitespace
823 * @buf: Output buffer with at least end-first+1 bytes of space
824 * @inq: Inquiry buffer (input)
825 * @first: Offset of string into inq
826 * @end: Index after last character in inq
827 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700828static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200829 unsigned first, unsigned end)
830{
831 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700832
833 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
834 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200835 buf[idx] = inq[idx+first];
836 term = idx+1;
837 } else {
838 buf[idx] = ' ';
839 }
840 }
841 buf[term] = 0;
842 return buf;
843}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700844#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500845
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846/**
847 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
848 * @starget: pointer to target device structure
849 * @lun: LUN of target device
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100850 * @sdevscan: probe the LUN corresponding to this scsi_device
851 * @sdevnew: store the value of any new scsi_device allocated
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 * @bflagsp: store bflags here if not NULL
853 *
854 * Description:
855 * Call scsi_probe_lun, if a LUN with an attached device is found,
856 * allocate and set it up by calling scsi_add_lun.
857 *
858 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100859 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
861 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100862 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 **/
864static int scsi_probe_and_add_lun(struct scsi_target *starget,
865 uint lun, int *bflagsp,
866 struct scsi_device **sdevp, int rescan,
867 void *hostdata)
868{
869 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -0500871 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
873
874 /*
875 * The rescan flag is used as an optimization, the first scan of a
876 * host adapter calls into here with rescan == 0.
877 */
James Bottomley6f3a2022005-09-22 20:33:28 -0500878 sdev = scsi_device_lookup_by_target(starget, lun);
879 if (sdev) {
880 if (rescan || sdev->sdev_state != SDEV_CREATED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
882 "scsi scan: device exists on %s\n",
883 sdev->sdev_gendev.bus_id));
884 if (sdevp)
885 *sdevp = sdev;
886 else
887 scsi_device_put(sdev);
888
889 if (bflagsp)
890 *bflagsp = scsi_get_device_flags(sdev,
891 sdev->vendor,
892 sdev->model);
893 return SCSI_SCAN_LUN_PRESENT;
894 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500895 scsi_device_put(sdev);
896 } else
897 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 if (!sdev)
899 goto out;
James Bottomley39216032005-06-15 18:48:29 -0500900
901 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -0700902 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 if (!result)
James Bottomley39216032005-06-15 18:48:29 -0500904 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905
James Bottomley39216032005-06-15 18:48:29 -0500906 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 goto out_free_result;
908
Kurt Garloff4186ab12006-04-03 15:16:48 +0200909 if (bflagsp)
910 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 /*
912 * result contains valid SCSI INQUIRY data.
913 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +0200914 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 /*
916 * For a Peripheral qualifier 3 (011b), the SCSI
917 * spec says: The device server is not capable of
918 * supporting a physical device on this logical
919 * unit.
920 *
921 * For disks, this implies that there is no
922 * logical disk configured at sdev->lun, but there
923 * is a target id responding.
924 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200925 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
926 " peripheral qualifier of 3, device not"
927 " added\n"))
928 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700929 SCSI_LOG_SCAN_BUS(1, {
930 unsigned char vend[9];
931 unsigned char mod[17];
932
933 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200934 "scsi scan: consider passing scsi_mod."
935 "dev_flags=%s:%s:0x240 or 0x800240\n",
936 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700937 scsi_inq_str(mod, result, 16, 32));
938 });
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200939 }
940
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 res = SCSI_SCAN_TARGET_PRESENT;
942 goto out_free_result;
943 }
944
Alan Stern1bfc5d92006-02-09 15:26:18 -0500945 /*
946 * Non-standard SCSI targets may set the PDT to 0x1f (unknown or
947 * no device type) instead of using the Peripheral Qualifier to
948 * indicate that no LUN is present. For example, USB UFI does this.
949 */
950 if (starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f) {
951 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
952 "scsi scan: peripheral device type"
953 " of 31, no device added\n"));
954 res = SCSI_SCAN_TARGET_PRESENT;
955 goto out_free_result;
956 }
957
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 res = scsi_add_lun(sdev, result, &bflags);
959 if (res == SCSI_SCAN_LUN_PRESENT) {
960 if (bflags & BLIST_KEY) {
961 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -0500962 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 }
965
966 out_free_result:
967 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 out_free_sdev:
969 if (res == SCSI_SCAN_LUN_PRESENT) {
970 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -0400971 if (scsi_device_get(sdev) == 0) {
972 *sdevp = sdev;
973 } else {
974 __scsi_remove_device(sdev);
975 res = SCSI_SCAN_NO_RESPONSE;
976 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 }
James Bottomley6f3a2022005-09-22 20:33:28 -0500978 } else
979 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 out:
981 return res;
982}
983
984/**
985 * scsi_sequential_lun_scan - sequentially scan a SCSI target
986 * @starget: pointer to target structure to scan
987 * @bflags: black/white list flag for LUN 0
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 *
989 * Description:
990 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
991 * scanned) to some maximum lun until a LUN is found with no device
992 * attached. Use the bflags to figure out any oddities.
993 *
994 * Modifies sdevscan->lun.
995 **/
996static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +0200997 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998{
999 unsigned int sparse_lun, lun, max_dev_lun;
1000 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1001
1002 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
1003 "%s\n", starget->dev.bus_id));
1004
1005 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1006 /*
1007 * If this device is known to support sparse multiple units,
1008 * override the other settings, and scan all of them. Normally,
1009 * SCSI-3 devices should be scanned via the REPORT LUNS.
1010 */
1011 if (bflags & BLIST_SPARSELUN) {
1012 max_dev_lun = shost->max_lun;
1013 sparse_lun = 1;
1014 } else
1015 sparse_lun = 0;
1016
1017 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 * If less than SCSI_1_CSS, and no special lun scaning, stop
1019 * scanning; this matches 2.4 behaviour, but could just be a bug
1020 * (to continue scanning a SCSI_1_CSS device).
1021 *
1022 * This test is broken. We might not have any device on lun0 for
1023 * a sparselun device, and if that's the case then how would we
1024 * know the real scsi_level, eh? It might make sense to just not
1025 * scan any SCSI_1 device for non-0 luns, but that check would best
1026 * go into scsi_alloc_sdev() and just have it return null when asked
1027 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1028 *
1029 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1030 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1031 == 0))
1032 return;
1033 */
1034 /*
1035 * If this device is known to support multiple units, override
1036 * the other settings, and scan all of them.
1037 */
1038 if (bflags & BLIST_FORCELUN)
1039 max_dev_lun = shost->max_lun;
1040 /*
1041 * REGAL CDC-4X: avoid hang after LUN 4
1042 */
1043 if (bflags & BLIST_MAX5LUN)
1044 max_dev_lun = min(5U, max_dev_lun);
1045 /*
1046 * Do not scan SCSI-2 or lower device past LUN 7, unless
1047 * BLIST_LARGELUN.
1048 */
1049 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1050 max_dev_lun = min(8U, max_dev_lun);
1051
1052 /*
1053 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1054 * until we reach the max, or no LUN is found and we are not
1055 * sparse_lun.
1056 */
1057 for (lun = 1; lun < max_dev_lun; ++lun)
1058 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1059 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1060 !sparse_lun)
1061 return;
1062}
1063
1064/**
1065 * scsilun_to_int: convert a scsi_lun to an int
1066 * @scsilun: struct scsi_lun to be converted.
1067 *
1068 * Description:
1069 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1070 * integer, and return the result. The caller must check for
1071 * truncation before using this function.
1072 *
1073 * Notes:
1074 * The struct scsi_lun is assumed to be four levels, with each level
1075 * effectively containing a SCSI byte-ordered (big endian) short; the
1076 * addressing bits of each level are ignored (the highest two bits).
1077 * For a description of the LUN format, post SCSI-3 see the SCSI
1078 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1079 *
1080 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1081 * the integer: 0x0b030a04
1082 **/
1083static int scsilun_to_int(struct scsi_lun *scsilun)
1084{
1085 int i;
1086 unsigned int lun;
1087
1088 lun = 0;
1089 for (i = 0; i < sizeof(lun); i += 2)
1090 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1091 scsilun->scsi_lun[i + 1]) << (i * 8));
1092 return lun;
1093}
1094
1095/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001096 * int_to_scsilun: reverts an int into a scsi_lun
1097 * @int: integer to be reverted
1098 * @scsilun: struct scsi_lun to be set.
1099 *
1100 * Description:
1101 * Reverts the functionality of the scsilun_to_int, which packed
1102 * an 8-byte lun value into an int. This routine unpacks the int
1103 * back into the lun value.
1104 * Note: the scsilun_to_int() routine does not truly handle all
1105 * 8bytes of the lun value. This functions restores only as much
1106 * as was set by the routine.
1107 *
1108 * Notes:
1109 * Given an integer : 0x0b030a04, this function returns a
1110 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1111 *
1112 **/
1113void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1114{
1115 int i;
1116
1117 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1118
1119 for (i = 0; i < sizeof(lun); i += 2) {
1120 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1121 scsilun->scsi_lun[i+1] = lun & 0xFF;
1122 lun = lun >> 16;
1123 }
1124}
1125EXPORT_SYMBOL(int_to_scsilun);
1126
1127/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001129 * @sdevscan: scan the host, channel, and id of this scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 *
1131 * Description:
1132 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN
1133 * command, and scan the resulting list of LUNs by calling
1134 * scsi_probe_and_add_lun.
1135 *
1136 * Modifies sdevscan->lun.
1137 *
1138 * Return:
1139 * 0: scan completed (or no memory, so further scanning is futile)
1140 * 1: no report lun scan, or not configured
1141 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001142static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 int rescan)
1144{
1145 char devname[64];
1146 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1147 unsigned int length;
1148 unsigned int lun;
1149 unsigned int num_luns;
1150 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001151 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 u8 *data;
1154 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001155 struct scsi_device *sdev;
1156 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001157 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158
1159 /*
1160 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1161 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1162 * support more than 8 LUNs.
1163 */
James Bottomley4d7db042006-03-31 20:07:45 -06001164 if (bflags & BLIST_NOREPORTLUN)
1165 return 1;
1166 if (starget->scsi_level < SCSI_2 &&
1167 starget->scsi_level != SCSI_UNKNOWN)
1168 return 1;
1169 if (starget->scsi_level < SCSI_3 &&
1170 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 return 1;
1172 if (bflags & BLIST_NOLUN)
1173 return 0;
1174
James Bottomley6f3a2022005-09-22 20:33:28 -05001175 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1176 sdev = scsi_alloc_sdev(starget, 0, NULL);
1177 if (!sdev)
1178 return 0;
1179 if (scsi_device_get(sdev))
1180 return 0;
1181 }
1182
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001184 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
1186 /*
1187 * Allocate enough to hold the header (the same size as one scsi_lun)
1188 * plus the max number of luns we are requesting.
1189 *
1190 * Reallocating and trying again (with the exact amount we need)
1191 * would be nice, but then we need to somehow limit the size
1192 * allocated based on the available memory and the limits of
1193 * kmalloc - we don't want a kmalloc() failure of a huge value to
1194 * prevent us from finding any LUNs on this target.
1195 */
1196 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1197 lun_data = kmalloc(length, GFP_ATOMIC |
1198 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001199 if (!lun_data) {
1200 printk(ALLOC_FAILURE_MSG, __FUNCTION__);
James Bottomley39216032005-06-15 18:48:29 -05001201 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001202 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
1204 scsi_cmd[0] = REPORT_LUNS;
1205
1206 /*
1207 * bytes 1 - 5: reserved, set to zero.
1208 */
1209 memset(&scsi_cmd[1], 0, 5);
1210
1211 /*
1212 * bytes 6 - 9: length of the command.
1213 */
1214 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1215 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1216 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1217 scsi_cmd[9] = (unsigned char) length & 0xff;
1218
1219 scsi_cmd[10] = 0; /* reserved */
1220 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221
1222 /*
1223 * We can get a UNIT ATTENTION, for example a power on/reset, so
1224 * retry a few times (like sd.c does for TEST UNIT READY).
1225 * Experience shows some combinations of adapter/devices get at
1226 * least two power on/resets.
1227 *
1228 * Illegal requests (for devices that do not support REPORT LUNS)
1229 * should come through as a check condition, and will not generate
1230 * a retry.
1231 */
1232 for (retries = 0; retries < 3; retries++) {
1233 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1234 " REPORT LUNS to %s (try %d)\n", devname,
1235 retries));
James Bottomley39216032005-06-15 18:48:29 -05001236
James Bottomley39216032005-06-15 18:48:29 -05001237 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001238 lun_data, length, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -05001239 SCSI_TIMEOUT + 4 * HZ, 3);
1240
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001242 " %s (try %d) result 0x%x\n", result
1243 ? "failed" : "successful", retries, result));
1244 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001246 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 if (sshdr.sense_key != UNIT_ATTENTION)
1248 break;
1249 }
1250 }
1251
James Bottomley39216032005-06-15 18:48:29 -05001252 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 /*
1254 * The device probably does not support a REPORT LUN command
1255 */
Alan Stern2ef89192005-11-08 15:51:55 -05001256 ret = 1;
1257 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259
1260 /*
1261 * Get the length from the first four bytes of lun_data.
1262 */
1263 data = (u8 *) lun_data->scsi_lun;
1264 length = ((data[0] << 24) | (data[1] << 16) |
1265 (data[2] << 8) | (data[3] << 0));
1266
1267 num_luns = (length / sizeof(struct scsi_lun));
1268 if (num_luns > max_scsi_report_luns) {
1269 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1270 " of %d luns reported, try increasing"
1271 " max_scsi_report_luns.\n", devname,
1272 max_scsi_report_luns, num_luns);
1273 num_luns = max_scsi_report_luns;
1274 }
1275
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001276 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1277 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278
1279 /*
1280 * Scan the luns in lun_data. The entry at offset 0 is really
1281 * the header, so start at 1 and go up to and including num_luns.
1282 */
1283 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1284 lun = scsilun_to_int(lunp);
1285
1286 /*
1287 * Check if the unused part of lunp is non-zero, and so
1288 * does not fit in lun.
1289 */
1290 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1291 int i;
1292
1293 /*
1294 * Output an error displaying the LUN in byte order,
1295 * this differs from what linux would print for the
1296 * integer LUN value.
1297 */
1298 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1299 data = (char *)lunp->scsi_lun;
1300 for (i = 0; i < sizeof(struct scsi_lun); i++)
1301 printk("%02x", data[i]);
1302 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 } else if (lun > sdev->host->max_lun) {
1304 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1305 " than allowed by the host adapter\n",
1306 devname, lun);
1307 } else {
1308 int res;
1309
1310 res = scsi_probe_and_add_lun(starget,
1311 lun, NULL, NULL, rescan, NULL);
1312 if (res == SCSI_SCAN_NO_RESPONSE) {
1313 /*
1314 * Got some results, but now none, abort.
1315 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001316 sdev_printk(KERN_ERR, sdev,
1317 "Unexpected response"
1318 " from lun %d while scanning, scan"
1319 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 break;
1321 }
1322 }
1323 }
1324
Alan Stern2ef89192005-11-08 15:51:55 -05001325 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001328 scsi_device_put(sdev);
1329 if (sdev->sdev_state == SDEV_CREATED)
1330 /*
1331 * the sdev we used didn't appear in the report luns scan
1332 */
1333 scsi_destroy_sdev(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001334 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335}
1336
1337struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1338 uint id, uint lun, void *hostdata)
1339{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001340 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001342 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001344 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 if (!starget)
1346 return ERR_PTR(-ENOMEM);
1347
Nathan Lynchc92715b2005-06-02 17:15:09 -05001348 get_device(&starget->dev);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001349 mutex_lock(&shost->scan_mutex);
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001350 if (scsi_host_scan_allowed(shost))
1351 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001352 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 scsi_target_reap(starget);
1354 put_device(&starget->dev);
1355
1356 return sdev;
1357}
1358EXPORT_SYMBOL(__scsi_add_device);
1359
James Bottomley146f7262005-09-10 12:44:09 -05001360int scsi_add_device(struct Scsi_Host *host, uint channel,
1361 uint target, uint lun)
1362{
1363 struct scsi_device *sdev =
1364 __scsi_add_device(host, channel, target, lun, NULL);
1365 if (IS_ERR(sdev))
1366 return PTR_ERR(sdev);
1367
1368 scsi_device_put(sdev);
1369 return 0;
1370}
1371EXPORT_SYMBOL(scsi_add_device);
1372
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373void scsi_rescan_device(struct device *dev)
1374{
1375 struct scsi_driver *drv;
1376
1377 if (!dev->driver)
1378 return;
1379
1380 drv = to_scsi_driver(dev->driver);
1381 if (try_module_get(drv->owner)) {
1382 if (drv->rescan)
1383 drv->rescan(dev);
1384 module_put(drv->owner);
1385 }
1386}
1387EXPORT_SYMBOL(scsi_rescan_device);
1388
Alan Sterne517d312005-07-26 10:18:45 -04001389static void __scsi_scan_target(struct device *parent, unsigned int channel,
1390 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391{
1392 struct Scsi_Host *shost = dev_to_shost(parent);
1393 int bflags = 0;
1394 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 struct scsi_target *starget;
1396
1397 if (shost->this_id == id)
1398 /*
1399 * Don't scan the host adapter
1400 */
1401 return;
1402
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 if (!starget)
1405 return;
1406
1407 get_device(&starget->dev);
1408 if (lun != SCAN_WILD_CARD) {
1409 /*
1410 * Scan for a specific host/chan/id/lun.
1411 */
1412 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1413 goto out_reap;
1414 }
1415
1416 /*
1417 * Scan LUN 0, if there is some response, scan further. Ideally, we
1418 * would not configure LUN 0 until all LUNs are scanned.
1419 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001420 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1421 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1422 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 /*
1424 * The REPORT LUN did not scan the target,
1425 * do a sequential scan.
1426 */
1427 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001428 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
1431 out_reap:
1432 /* now determine if the target has any children at all
1433 * and if not, nuke it */
1434 scsi_target_reap(starget);
1435
1436 put_device(&starget->dev);
1437}
Alan Sterne517d312005-07-26 10:18:45 -04001438
1439/**
1440 * scsi_scan_target - scan a target id, possibly including all LUNs on the
1441 * target.
1442 * @parent: host to scan
1443 * @channel: channel to scan
1444 * @id: target id to scan
1445 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1446 * @rescan: passed to LUN scanning routines
1447 *
1448 * Description:
1449 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1450 * and possibly all LUNs on the target id.
1451 *
1452 * First try a REPORT LUN scan, if that does not scan the target, do a
1453 * sequential scan of LUNs on the target id.
1454 **/
1455void scsi_scan_target(struct device *parent, unsigned int channel,
1456 unsigned int id, unsigned int lun, int rescan)
1457{
1458 struct Scsi_Host *shost = dev_to_shost(parent);
1459
Arjan van de Ven0b950672006-01-11 13:16:10 +01001460 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001461 if (scsi_host_scan_allowed(shost))
1462 __scsi_scan_target(parent, channel, id, lun, rescan);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001463 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001464}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465EXPORT_SYMBOL(scsi_scan_target);
1466
1467static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1468 unsigned int id, unsigned int lun, int rescan)
1469{
1470 uint order_id;
1471
1472 if (id == SCAN_WILD_CARD)
1473 for (id = 0; id < shost->max_id; ++id) {
1474 /*
1475 * XXX adapter drivers when possible (FCP, iSCSI)
1476 * could modify max_id to match the current max,
1477 * not the absolute max.
1478 *
1479 * XXX add a shost id iterator, so for example,
1480 * the FC ID can be the same as a target id
1481 * without a huge overhead of sparse id's.
1482 */
1483 if (shost->reverse_ordering)
1484 /*
1485 * Scan from high to low id.
1486 */
1487 order_id = shost->max_id - id - 1;
1488 else
1489 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001490 __scsi_scan_target(&shost->shost_gendev, channel,
1491 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 }
1493 else
Alan Sterne517d312005-07-26 10:18:45 -04001494 __scsi_scan_target(&shost->shost_gendev, channel,
1495 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496}
1497
1498int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1499 unsigned int id, unsigned int lun, int rescan)
1500{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001501 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1502 "%s: <%u:%u:%u>\n",
1503 __FUNCTION__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504
1505 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001506 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1508 return -EINVAL;
1509
Arjan van de Ven0b950672006-01-11 13:16:10 +01001510 mutex_lock(&shost->scan_mutex);
Mike Anderson82f29462005-06-16 11:14:33 -07001511 if (scsi_host_scan_allowed(shost)) {
1512 if (channel == SCAN_WILD_CARD)
1513 for (channel = 0; channel <= shost->max_channel;
1514 channel++)
1515 scsi_scan_channel(shost, channel, id, lun,
1516 rescan);
1517 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001519 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001520 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
1522 return 0;
1523}
1524
1525/**
1526 * scsi_scan_host - scan the given adapter
1527 * @shost: adapter to scan
1528 **/
1529void scsi_scan_host(struct Scsi_Host *shost)
1530{
1531 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1532 SCAN_WILD_CARD, 0);
1533}
1534EXPORT_SYMBOL(scsi_scan_host);
1535
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536void scsi_forget_host(struct Scsi_Host *shost)
1537{
Alan Sterna64358d2005-07-26 10:27:10 -04001538 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539 unsigned long flags;
1540
Alan Sterna64358d2005-07-26 10:27:10 -04001541 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001543 list_for_each_entry(sdev, &shost->__devices, siblings) {
1544 if (sdev->sdev_state == SDEV_DEL)
1545 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001547 __scsi_remove_device(sdev);
1548 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 }
1550 spin_unlock_irqrestore(shost->host_lock, flags);
1551}
1552
1553/*
1554 * Function: scsi_get_host_dev()
1555 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001556 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001558 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559 *
1560 * Lock status: None assumed.
1561 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001562 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 *
1564 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001565 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 * be made to look like a "pseudo-device" that points to the
1567 * HA itself.
1568 *
1569 * Note - this device is not accessible from any high-level
1570 * drivers (including generics), which is probably not
1571 * optimal. We can add hooks later to attach
1572 */
1573struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1574{
Alan Sterne517d312005-07-26 10:18:45 -04001575 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 struct scsi_target *starget;
1577
Arjan van de Ven0b950672006-01-11 13:16:10 +01001578 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001579 if (!scsi_host_scan_allowed(shost))
1580 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1582 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001583 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584
1585 sdev = scsi_alloc_sdev(starget, 0, NULL);
1586 if (sdev) {
1587 sdev->sdev_gendev.parent = get_device(&starget->dev);
1588 sdev->borken = 0;
1589 }
1590 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001591 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001592 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 return sdev;
1594}
1595EXPORT_SYMBOL(scsi_get_host_dev);
1596
1597/*
1598 * Function: scsi_free_host_dev()
1599 *
1600 * Purpose: Free a scsi_device that points to the host adapter itself.
1601 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001602 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 *
1604 * Lock status: None assumed.
1605 *
1606 * Returns: Nothing
1607 *
1608 * Notes:
1609 */
1610void scsi_free_host_dev(struct scsi_device *sdev)
1611{
1612 BUG_ON(sdev->id != sdev->host->this_id);
1613
James Bottomley6f3a2022005-09-22 20:33:28 -05001614 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615}
1616EXPORT_SYMBOL(scsi_free_host_dev);
1617