Commit | Line | Data |
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1da177e4 LT |
1 | /* |
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 | |
f64a181d | 12 | * device attached, a scsi_device is allocated and setup for it. |
1da177e4 LT |
13 | * |
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 | |
f64a181d | 20 | * scsi_device for it. |
1da177e4 LT |
21 | * |
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 | ||
1da177e4 LT |
28 | #include <linux/module.h> |
29 | #include <linux/moduleparam.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/blkdev.h> | |
3e082a91 MW |
32 | #include <linux/delay.h> |
33 | #include <linux/kthread.h> | |
34 | #include <linux/spinlock.h> | |
1da177e4 LT |
35 | |
36 | #include <scsi/scsi.h> | |
beb40487 | 37 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
38 | #include <scsi/scsi_device.h> |
39 | #include <scsi/scsi_driver.h> | |
40 | #include <scsi/scsi_devinfo.h> | |
41 | #include <scsi/scsi_host.h> | |
1da177e4 LT |
42 | #include <scsi/scsi_transport.h> |
43 | #include <scsi/scsi_eh.h> | |
44 | ||
45 | #include "scsi_priv.h" | |
46 | #include "scsi_logging.h" | |
47 | ||
48 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ | |
49 | " SCSI scanning, some SCSI devices might not be configured\n" | |
50 | ||
51 | /* | |
52 | * Default timeout | |
53 | */ | |
54 | #define SCSI_TIMEOUT (2*HZ) | |
55 | ||
56 | /* | |
405ae7d3 | 57 | * Prefix values for the SCSI id's (stored in sysfs name field) |
1da177e4 LT |
58 | */ |
59 | #define SCSI_UID_SER_NUM 'S' | |
60 | #define SCSI_UID_UNKNOWN 'Z' | |
61 | ||
62 | /* | |
63 | * Return values of some of the scanning functions. | |
64 | * | |
65 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this | |
66 | * includes allocation or general failures preventing IO from being sent. | |
67 | * | |
68 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available | |
69 | * on the given LUN. | |
70 | * | |
71 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a | |
72 | * given LUN. | |
73 | */ | |
74 | #define SCSI_SCAN_NO_RESPONSE 0 | |
75 | #define SCSI_SCAN_TARGET_PRESENT 1 | |
76 | #define SCSI_SCAN_LUN_PRESENT 2 | |
77 | ||
0ad78200 | 78 | static const char *scsi_null_device_strs = "nullnullnullnull"; |
1da177e4 LT |
79 | |
80 | #define MAX_SCSI_LUNS 512 | |
81 | ||
82 | #ifdef CONFIG_SCSI_MULTI_LUN | |
83 | static unsigned int max_scsi_luns = MAX_SCSI_LUNS; | |
84 | #else | |
85 | static unsigned int max_scsi_luns = 1; | |
86 | #endif | |
87 | ||
10f4b89a | 88 | module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
89 | MODULE_PARM_DESC(max_luns, |
90 | "last scsi LUN (should be between 1 and 2^32-1)"); | |
91 | ||
21db1882 MW |
92 | #ifdef CONFIG_SCSI_SCAN_ASYNC |
93 | #define SCSI_SCAN_TYPE_DEFAULT "async" | |
94 | #else | |
95 | #define SCSI_SCAN_TYPE_DEFAULT "sync" | |
96 | #endif | |
97 | ||
98 | static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT; | |
3e082a91 MW |
99 | |
100 | module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO); | |
101 | MODULE_PARM_DESC(scan, "sync, async or none"); | |
102 | ||
1da177e4 LT |
103 | /* |
104 | * max_scsi_report_luns: the maximum number of LUNS that will be | |
105 | * returned from the REPORT LUNS command. 8 times this value must | |
106 | * be allocated. In theory this could be up to an 8 byte value, but | |
107 | * in practice, the maximum number of LUNs suppored by any device | |
108 | * is about 16k. | |
109 | */ | |
110 | static unsigned int max_scsi_report_luns = 511; | |
111 | ||
10f4b89a | 112 | module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
113 | MODULE_PARM_DESC(max_report_luns, |
114 | "REPORT LUNS maximum number of LUNS received (should be" | |
115 | " between 1 and 16384)"); | |
116 | ||
117 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3; | |
118 | ||
10f4b89a | 119 | module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR); |
1da177e4 LT |
120 | MODULE_PARM_DESC(inq_timeout, |
121 | "Timeout (in seconds) waiting for devices to answer INQUIRY." | |
122 | " Default is 5. Some non-compliant devices need more."); | |
123 | ||
6b7f123f | 124 | /* This lock protects only this list */ |
3e082a91 MW |
125 | static DEFINE_SPINLOCK(async_scan_lock); |
126 | static LIST_HEAD(scanning_hosts); | |
127 | ||
128 | struct async_scan_data { | |
129 | struct list_head list; | |
130 | struct Scsi_Host *shost; | |
131 | struct completion prev_finished; | |
132 | }; | |
133 | ||
134 | /** | |
135 | * scsi_complete_async_scans - Wait for asynchronous scans to complete | |
136 | * | |
8bcc2412 MW |
137 | * When this function returns, any host which started scanning before |
138 | * this function was called will have finished its scan. Hosts which | |
139 | * started scanning after this function was called may or may not have | |
140 | * finished. | |
3e082a91 MW |
141 | */ |
142 | int scsi_complete_async_scans(void) | |
143 | { | |
144 | struct async_scan_data *data; | |
145 | ||
146 | do { | |
147 | if (list_empty(&scanning_hosts)) | |
148 | return 0; | |
149 | /* If we can't get memory immediately, that's OK. Just | |
150 | * sleep a little. Even if we never get memory, the async | |
151 | * scans will finish eventually. | |
152 | */ | |
153 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
154 | if (!data) | |
155 | msleep(1); | |
156 | } while (!data); | |
157 | ||
158 | data->shost = NULL; | |
159 | init_completion(&data->prev_finished); | |
160 | ||
161 | spin_lock(&async_scan_lock); | |
162 | /* Check that there's still somebody else on the list */ | |
163 | if (list_empty(&scanning_hosts)) | |
164 | goto done; | |
165 | list_add_tail(&data->list, &scanning_hosts); | |
166 | spin_unlock(&async_scan_lock); | |
167 | ||
168 | printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n"); | |
169 | wait_for_completion(&data->prev_finished); | |
170 | ||
171 | spin_lock(&async_scan_lock); | |
172 | list_del(&data->list); | |
8bcc2412 MW |
173 | if (!list_empty(&scanning_hosts)) { |
174 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
175 | struct async_scan_data, list); | |
176 | complete(&next->prev_finished); | |
177 | } | |
3e082a91 MW |
178 | done: |
179 | spin_unlock(&async_scan_lock); | |
180 | ||
181 | kfree(data); | |
182 | return 0; | |
183 | } | |
184 | ||
3e082a91 MW |
185 | /* Only exported for the benefit of scsi_wait_scan */ |
186 | EXPORT_SYMBOL_GPL(scsi_complete_async_scans); | |
3e082a91 | 187 | |
f2f027c6 HD |
188 | #ifndef MODULE |
189 | /* | |
190 | * For async scanning we need to wait for all the scans to complete before | |
191 | * trying to mount the root fs. Otherwise non-modular drivers may not be ready | |
192 | * yet. | |
193 | */ | |
194 | late_initcall(scsi_complete_async_scans); | |
195 | #endif | |
196 | ||
1da177e4 LT |
197 | /** |
198 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command | |
39216033 | 199 | * @sdev: scsi device to send command to |
1da177e4 LT |
200 | * @result: area to store the result of the MODE SENSE |
201 | * | |
202 | * Description: | |
39216033 | 203 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
1da177e4 LT |
204 | * Called for BLIST_KEY devices. |
205 | **/ | |
39216033 | 206 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
1da177e4 LT |
207 | unsigned char *result) |
208 | { | |
209 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
210 | ||
211 | printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); | |
212 | scsi_cmd[0] = MODE_SENSE; | |
213 | scsi_cmd[1] = 0; | |
214 | scsi_cmd[2] = 0x2e; | |
215 | scsi_cmd[3] = 0; | |
39216033 | 216 | scsi_cmd[4] = 0x2a; /* size */ |
1da177e4 | 217 | scsi_cmd[5] = 0; |
39216033 JB |
218 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
219 | SCSI_TIMEOUT, 3); | |
1da177e4 LT |
220 | } |
221 | ||
1da177e4 LT |
222 | /** |
223 | * scsi_alloc_sdev - allocate and setup a scsi_Device | |
eb44820c RL |
224 | * @starget: which target to allocate a &scsi_device for |
225 | * @lun: which lun | |
226 | * @hostdata: usually NULL and set by ->slave_alloc instead | |
1da177e4 LT |
227 | * |
228 | * Description: | |
229 | * Allocate, initialize for io, and return a pointer to a scsi_Device. | |
230 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and | |
231 | * adds scsi_Device to the appropriate list. | |
232 | * | |
233 | * Return value: | |
234 | * scsi_Device pointer, or NULL on failure. | |
235 | **/ | |
236 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, | |
237 | unsigned int lun, void *hostdata) | |
238 | { | |
239 | struct scsi_device *sdev; | |
240 | int display_failure_msg = 1, ret; | |
241 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
a341cd0f | 242 | extern void scsi_evt_thread(struct work_struct *work); |
1da177e4 | 243 | |
24669f75 | 244 | sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, |
1da177e4 LT |
245 | GFP_ATOMIC); |
246 | if (!sdev) | |
247 | goto out; | |
248 | ||
1da177e4 LT |
249 | sdev->vendor = scsi_null_device_strs; |
250 | sdev->model = scsi_null_device_strs; | |
251 | sdev->rev = scsi_null_device_strs; | |
252 | sdev->host = shost; | |
253 | sdev->id = starget->id; | |
254 | sdev->lun = lun; | |
255 | sdev->channel = starget->channel; | |
256 | sdev->sdev_state = SDEV_CREATED; | |
257 | INIT_LIST_HEAD(&sdev->siblings); | |
258 | INIT_LIST_HEAD(&sdev->same_target_siblings); | |
259 | INIT_LIST_HEAD(&sdev->cmd_list); | |
260 | INIT_LIST_HEAD(&sdev->starved_entry); | |
a341cd0f | 261 | INIT_LIST_HEAD(&sdev->event_list); |
1da177e4 | 262 | spin_lock_init(&sdev->list_lock); |
a341cd0f | 263 | INIT_WORK(&sdev->event_work, scsi_evt_thread); |
1da177e4 LT |
264 | |
265 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
266 | sdev->sdev_target = starget; | |
267 | ||
268 | /* usually NULL and set by ->slave_alloc instead */ | |
269 | sdev->hostdata = hostdata; | |
270 | ||
271 | /* if the device needs this changing, it may do so in the | |
272 | * slave_configure function */ | |
273 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; | |
274 | ||
275 | /* | |
276 | * Some low level driver could use device->type | |
277 | */ | |
278 | sdev->type = -1; | |
279 | ||
280 | /* | |
281 | * Assume that the device will have handshaking problems, | |
282 | * and then fix this field later if it turns out it | |
283 | * doesn't | |
284 | */ | |
285 | sdev->borken = 1; | |
286 | ||
1da177e4 LT |
287 | sdev->request_queue = scsi_alloc_queue(sdev); |
288 | if (!sdev->request_queue) { | |
289 | /* release fn is set up in scsi_sysfs_device_initialise, so | |
290 | * have to free and put manually here */ | |
291 | put_device(&starget->dev); | |
93f56089 | 292 | kfree(sdev); |
1da177e4 LT |
293 | goto out; |
294 | } | |
295 | ||
296 | sdev->request_queue->queuedata = sdev; | |
297 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); | |
298 | ||
299 | scsi_sysfs_device_initialize(sdev); | |
300 | ||
301 | if (shost->hostt->slave_alloc) { | |
302 | ret = shost->hostt->slave_alloc(sdev); | |
303 | if (ret) { | |
304 | /* | |
305 | * if LLDD reports slave not present, don't clutter | |
306 | * console with alloc failure messages | |
1da177e4 LT |
307 | */ |
308 | if (ret == -ENXIO) | |
309 | display_failure_msg = 0; | |
310 | goto out_device_destroy; | |
311 | } | |
312 | } | |
313 | ||
314 | return sdev; | |
315 | ||
316 | out_device_destroy: | |
317 | transport_destroy_device(&sdev->sdev_gendev); | |
1da177e4 LT |
318 | put_device(&sdev->sdev_gendev); |
319 | out: | |
320 | if (display_failure_msg) | |
cadbd4a5 | 321 | printk(ALLOC_FAILURE_MSG, __func__); |
1da177e4 LT |
322 | return NULL; |
323 | } | |
324 | ||
643eb2d9 JB |
325 | static void scsi_target_destroy(struct scsi_target *starget) |
326 | { | |
327 | struct device *dev = &starget->dev; | |
328 | struct Scsi_Host *shost = dev_to_shost(dev->parent); | |
329 | unsigned long flags; | |
330 | ||
331 | transport_destroy_device(dev); | |
332 | spin_lock_irqsave(shost->host_lock, flags); | |
333 | if (shost->hostt->target_destroy) | |
334 | shost->hostt->target_destroy(starget); | |
335 | list_del_init(&starget->siblings); | |
336 | spin_unlock_irqrestore(shost->host_lock, flags); | |
337 | put_device(dev); | |
338 | } | |
339 | ||
1da177e4 LT |
340 | static void scsi_target_dev_release(struct device *dev) |
341 | { | |
342 | struct device *parent = dev->parent; | |
343 | struct scsi_target *starget = to_scsi_target(dev); | |
a283bd37 | 344 | |
1da177e4 LT |
345 | kfree(starget); |
346 | put_device(parent); | |
347 | } | |
348 | ||
453cd0f3 | 349 | static struct device_type scsi_target_type = { |
b0ed4336 HR |
350 | .name = "scsi_target", |
351 | .release = scsi_target_dev_release, | |
352 | }; | |
353 | ||
1da177e4 LT |
354 | int scsi_is_target_device(const struct device *dev) |
355 | { | |
b0ed4336 | 356 | return dev->type == &scsi_target_type; |
1da177e4 LT |
357 | } |
358 | EXPORT_SYMBOL(scsi_is_target_device); | |
359 | ||
360 | static struct scsi_target *__scsi_find_target(struct device *parent, | |
361 | int channel, uint id) | |
362 | { | |
363 | struct scsi_target *starget, *found_starget = NULL; | |
364 | struct Scsi_Host *shost = dev_to_shost(parent); | |
365 | /* | |
366 | * Search for an existing target for this sdev. | |
367 | */ | |
368 | list_for_each_entry(starget, &shost->__targets, siblings) { | |
369 | if (starget->id == id && | |
370 | starget->channel == channel) { | |
371 | found_starget = starget; | |
372 | break; | |
373 | } | |
374 | } | |
375 | if (found_starget) | |
376 | get_device(&found_starget->dev); | |
377 | ||
378 | return found_starget; | |
379 | } | |
380 | ||
884d25cc JB |
381 | /** |
382 | * scsi_alloc_target - allocate a new or find an existing target | |
383 | * @parent: parent of the target (need not be a scsi host) | |
384 | * @channel: target channel number (zero if no channels) | |
385 | * @id: target id number | |
386 | * | |
387 | * Return an existing target if one exists, provided it hasn't already | |
388 | * gone into STARGET_DEL state, otherwise allocate a new target. | |
389 | * | |
390 | * The target is returned with an incremented reference, so the caller | |
391 | * is responsible for both reaping and doing a last put | |
392 | */ | |
1da177e4 LT |
393 | static struct scsi_target *scsi_alloc_target(struct device *parent, |
394 | int channel, uint id) | |
395 | { | |
396 | struct Scsi_Host *shost = dev_to_shost(parent); | |
397 | struct device *dev = NULL; | |
398 | unsigned long flags; | |
399 | const int size = sizeof(struct scsi_target) | |
400 | + shost->transportt->target_size; | |
5c44cd2a | 401 | struct scsi_target *starget; |
1da177e4 | 402 | struct scsi_target *found_target; |
32f95792 | 403 | int error; |
1da177e4 | 404 | |
24669f75 | 405 | starget = kzalloc(size, GFP_KERNEL); |
1da177e4 | 406 | if (!starget) { |
cadbd4a5 | 407 | printk(KERN_ERR "%s: allocation failure\n", __func__); |
1da177e4 LT |
408 | return NULL; |
409 | } | |
1da177e4 LT |
410 | dev = &starget->dev; |
411 | device_initialize(dev); | |
412 | starget->reap_ref = 1; | |
413 | dev->parent = get_device(parent); | |
1da177e4 LT |
414 | sprintf(dev->bus_id, "target%d:%d:%d", |
415 | shost->host_no, channel, id); | |
b0ed4336 HR |
416 | #ifndef CONFIG_SYSFS_DEPRECATED |
417 | dev->bus = &scsi_bus_type; | |
418 | #endif | |
419 | dev->type = &scsi_target_type; | |
1da177e4 LT |
420 | starget->id = id; |
421 | starget->channel = channel; | |
f0c0a376 | 422 | starget->can_queue = 0; |
1da177e4 LT |
423 | INIT_LIST_HEAD(&starget->siblings); |
424 | INIT_LIST_HEAD(&starget->devices); | |
643eb2d9 | 425 | starget->state = STARGET_CREATED; |
7c9d6f16 | 426 | starget->scsi_level = SCSI_2; |
ffedb452 | 427 | retry: |
1da177e4 LT |
428 | spin_lock_irqsave(shost->host_lock, flags); |
429 | ||
430 | found_target = __scsi_find_target(parent, channel, id); | |
431 | if (found_target) | |
432 | goto found; | |
433 | ||
434 | list_add_tail(&starget->siblings, &shost->__targets); | |
435 | spin_unlock_irqrestore(shost->host_lock, flags); | |
436 | /* allocate and add */ | |
a283bd37 | 437 | transport_setup_device(dev); |
a283bd37 | 438 | if (shost->hostt->target_alloc) { |
32f95792 | 439 | error = shost->hostt->target_alloc(starget); |
a283bd37 JB |
440 | |
441 | if(error) { | |
442 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); | |
443 | /* don't want scsi_target_reap to do the final | |
444 | * put because it will be under the host lock */ | |
643eb2d9 | 445 | scsi_target_destroy(starget); |
a283bd37 JB |
446 | return NULL; |
447 | } | |
448 | } | |
884d25cc | 449 | get_device(dev); |
a283bd37 | 450 | |
1da177e4 LT |
451 | return starget; |
452 | ||
453 | found: | |
454 | found_target->reap_ref++; | |
455 | spin_unlock_irqrestore(shost->host_lock, flags); | |
ffedb452 | 456 | if (found_target->state != STARGET_DEL) { |
884d25cc | 457 | put_device(parent); |
ffedb452 JB |
458 | kfree(starget); |
459 | return found_target; | |
460 | } | |
461 | /* Unfortunately, we found a dying target; need to | |
462 | * wait until it's dead before we can get a new one */ | |
463 | put_device(&found_target->dev); | |
464 | flush_scheduled_work(); | |
465 | goto retry; | |
1da177e4 LT |
466 | } |
467 | ||
65f27f38 | 468 | static void scsi_target_reap_usercontext(struct work_struct *work) |
65110b21 | 469 | { |
65f27f38 DH |
470 | struct scsi_target *starget = |
471 | container_of(work, struct scsi_target, ew.work); | |
863a930a | 472 | |
ffedb452 JB |
473 | transport_remove_device(&starget->dev); |
474 | device_del(&starget->dev); | |
643eb2d9 | 475 | scsi_target_destroy(starget); |
863a930a JB |
476 | } |
477 | ||
1da177e4 LT |
478 | /** |
479 | * scsi_target_reap - check to see if target is in use and destroy if not | |
1da177e4 LT |
480 | * @starget: target to be checked |
481 | * | |
482 | * This is used after removing a LUN or doing a last put of the target | |
483 | * it checks atomically that nothing is using the target and removes | |
484 | * it if so. | |
485 | */ | |
486 | void scsi_target_reap(struct scsi_target *starget) | |
487 | { | |
ffedb452 JB |
488 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
489 | unsigned long flags; | |
643eb2d9 JB |
490 | enum scsi_target_state state; |
491 | int empty; | |
ffedb452 JB |
492 | |
493 | spin_lock_irqsave(shost->host_lock, flags); | |
643eb2d9 JB |
494 | state = starget->state; |
495 | empty = --starget->reap_ref == 0 && | |
496 | list_empty(&starget->devices) ? 1 : 0; | |
497 | spin_unlock_irqrestore(shost->host_lock, flags); | |
ffedb452 | 498 | |
643eb2d9 | 499 | if (!empty) |
ffedb452 JB |
500 | return; |
501 | ||
643eb2d9 JB |
502 | BUG_ON(state == STARGET_DEL); |
503 | starget->state = STARGET_DEL; | |
504 | if (state == STARGET_CREATED) | |
505 | scsi_target_destroy(starget); | |
506 | else | |
507 | execute_in_process_context(scsi_target_reap_usercontext, | |
508 | &starget->ew); | |
1da177e4 LT |
509 | } |
510 | ||
e5b3cd42 AS |
511 | /** |
512 | * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string | |
513 | * @s: INQUIRY result string to sanitize | |
514 | * @len: length of the string | |
515 | * | |
516 | * Description: | |
517 | * The SCSI spec says that INQUIRY vendor, product, and revision | |
518 | * strings must consist entirely of graphic ASCII characters, | |
519 | * padded on the right with spaces. Since not all devices obey | |
520 | * this rule, we will replace non-graphic or non-ASCII characters | |
521 | * with spaces. Exception: a NUL character is interpreted as a | |
522 | * string terminator, so all the following characters are set to | |
523 | * spaces. | |
524 | **/ | |
525 | static void sanitize_inquiry_string(unsigned char *s, int len) | |
526 | { | |
527 | int terminated = 0; | |
528 | ||
529 | for (; len > 0; (--len, ++s)) { | |
530 | if (*s == 0) | |
531 | terminated = 1; | |
532 | if (terminated || *s < 0x20 || *s > 0x7e) | |
533 | *s = ' '; | |
534 | } | |
535 | } | |
536 | ||
1da177e4 LT |
537 | /** |
538 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY | |
39216033 | 539 | * @sdev: scsi_device to probe |
1da177e4 | 540 | * @inq_result: area to store the INQUIRY result |
39216033 | 541 | * @result_len: len of inq_result |
1da177e4 LT |
542 | * @bflags: store any bflags found here |
543 | * | |
544 | * Description: | |
39216033 | 545 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
1da177e4 | 546 | * |
39216033 | 547 | * If the INQUIRY is successful, zero is returned and the |
1da177e4 | 548 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
f64a181d | 549 | * are copied to the scsi_device any flags value is stored in *@bflags. |
1da177e4 | 550 | **/ |
e5b3cd42 | 551 | static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, |
39216033 | 552 | int result_len, int *bflags) |
1da177e4 | 553 | { |
1da177e4 LT |
554 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
555 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; | |
556 | int response_len = 0; | |
39216033 | 557 | int pass, count, result; |
1da177e4 LT |
558 | struct scsi_sense_hdr sshdr; |
559 | ||
560 | *bflags = 0; | |
561 | ||
562 | /* Perform up to 3 passes. The first pass uses a conservative | |
563 | * transfer length of 36 unless sdev->inquiry_len specifies a | |
564 | * different value. */ | |
565 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; | |
566 | try_inquiry_len = first_inquiry_len; | |
567 | pass = 1; | |
568 | ||
569 | next_pass: | |
9ccfc756 JB |
570 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
571 | "scsi scan: INQUIRY pass %d length %d\n", | |
572 | pass, try_inquiry_len)); | |
1da177e4 LT |
573 | |
574 | /* Each pass gets up to three chances to ignore Unit Attention */ | |
575 | for (count = 0; count < 3; ++count) { | |
576 | memset(scsi_cmd, 0, 6); | |
577 | scsi_cmd[0] = INQUIRY; | |
578 | scsi_cmd[4] = (unsigned char) try_inquiry_len; | |
1da177e4 LT |
579 | |
580 | memset(inq_result, 0, try_inquiry_len); | |
39216033 JB |
581 | |
582 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, | |
ea73a9f2 | 583 | inq_result, try_inquiry_len, &sshdr, |
39216033 | 584 | HZ / 2 + HZ * scsi_inq_timeout, 3); |
1da177e4 LT |
585 | |
586 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " | |
587 | "with code 0x%x\n", | |
39216033 | 588 | result ? "failed" : "successful", result)); |
1da177e4 | 589 | |
39216033 | 590 | if (result) { |
1da177e4 LT |
591 | /* |
592 | * not-ready to ready transition [asc/ascq=0x28/0x0] | |
593 | * or power-on, reset [asc/ascq=0x29/0x0], continue. | |
594 | * INQUIRY should not yield UNIT_ATTENTION | |
595 | * but many buggy devices do so anyway. | |
596 | */ | |
39216033 | 597 | if ((driver_byte(result) & DRIVER_SENSE) && |
ea73a9f2 | 598 | scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
599 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
600 | ((sshdr.asc == 0x28) || | |
601 | (sshdr.asc == 0x29)) && | |
602 | (sshdr.ascq == 0)) | |
603 | continue; | |
604 | } | |
605 | } | |
606 | break; | |
607 | } | |
608 | ||
39216033 | 609 | if (result == 0) { |
e5b3cd42 AS |
610 | sanitize_inquiry_string(&inq_result[8], 8); |
611 | sanitize_inquiry_string(&inq_result[16], 16); | |
612 | sanitize_inquiry_string(&inq_result[32], 4); | |
613 | ||
614 | response_len = inq_result[4] + 5; | |
1da177e4 LT |
615 | if (response_len > 255) |
616 | response_len = first_inquiry_len; /* sanity */ | |
617 | ||
618 | /* | |
619 | * Get any flags for this device. | |
620 | * | |
f64a181d CH |
621 | * XXX add a bflags to scsi_device, and replace the |
622 | * corresponding bit fields in scsi_device, so bflags | |
1da177e4 LT |
623 | * need not be passed as an argument. |
624 | */ | |
625 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], | |
626 | &inq_result[16]); | |
627 | ||
628 | /* When the first pass succeeds we gain information about | |
629 | * what larger transfer lengths might work. */ | |
630 | if (pass == 1) { | |
631 | if (BLIST_INQUIRY_36 & *bflags) | |
632 | next_inquiry_len = 36; | |
633 | else if (BLIST_INQUIRY_58 & *bflags) | |
634 | next_inquiry_len = 58; | |
635 | else if (sdev->inquiry_len) | |
636 | next_inquiry_len = sdev->inquiry_len; | |
637 | else | |
638 | next_inquiry_len = response_len; | |
639 | ||
640 | /* If more data is available perform the second pass */ | |
641 | if (next_inquiry_len > try_inquiry_len) { | |
642 | try_inquiry_len = next_inquiry_len; | |
643 | pass = 2; | |
644 | goto next_pass; | |
645 | } | |
646 | } | |
647 | ||
648 | } else if (pass == 2) { | |
649 | printk(KERN_INFO "scsi scan: %d byte inquiry failed. " | |
650 | "Consider BLIST_INQUIRY_36 for this device\n", | |
651 | try_inquiry_len); | |
652 | ||
653 | /* If this pass failed, the third pass goes back and transfers | |
654 | * the same amount as we successfully got in the first pass. */ | |
655 | try_inquiry_len = first_inquiry_len; | |
656 | pass = 3; | |
657 | goto next_pass; | |
658 | } | |
659 | ||
660 | /* If the last transfer attempt got an error, assume the | |
661 | * peripheral doesn't exist or is dead. */ | |
39216033 JB |
662 | if (result) |
663 | return -EIO; | |
1da177e4 LT |
664 | |
665 | /* Don't report any more data than the device says is valid */ | |
666 | sdev->inquiry_len = min(try_inquiry_len, response_len); | |
667 | ||
668 | /* | |
669 | * XXX Abort if the response length is less than 36? If less than | |
670 | * 32, the lookup of the device flags (above) could be invalid, | |
671 | * and it would be possible to take an incorrect action - we do | |
672 | * not want to hang because of a short INQUIRY. On the flip side, | |
673 | * if the device is spun down or becoming ready (and so it gives a | |
674 | * short INQUIRY), an abort here prevents any further use of the | |
675 | * device, including spin up. | |
676 | * | |
e423ee31 AS |
677 | * On the whole, the best approach seems to be to assume the first |
678 | * 36 bytes are valid no matter what the device says. That's | |
679 | * better than copying < 36 bytes to the inquiry-result buffer | |
680 | * and displaying garbage for the Vendor, Product, or Revision | |
681 | * strings. | |
682 | */ | |
683 | if (sdev->inquiry_len < 36) { | |
684 | printk(KERN_INFO "scsi scan: INQUIRY result too short (%d)," | |
685 | " using 36\n", sdev->inquiry_len); | |
686 | sdev->inquiry_len = 36; | |
687 | } | |
688 | ||
689 | /* | |
1da177e4 LT |
690 | * Related to the above issue: |
691 | * | |
692 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, | |
693 | * and if not ready, sent a START_STOP to start (maybe spin up) and | |
694 | * then send the INQUIRY again, since the INQUIRY can change after | |
695 | * a device is initialized. | |
696 | * | |
697 | * Ideally, start a device if explicitly asked to do so. This | |
698 | * assumes that a device is spun up on power on, spun down on | |
699 | * request, and then spun up on request. | |
700 | */ | |
701 | ||
702 | /* | |
703 | * The scanning code needs to know the scsi_level, even if no | |
704 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so | |
705 | * non-zero LUNs can be scanned. | |
706 | */ | |
707 | sdev->scsi_level = inq_result[2] & 0x07; | |
708 | if (sdev->scsi_level >= 2 || | |
709 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) | |
710 | sdev->scsi_level++; | |
6f3a2024 | 711 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
1da177e4 | 712 | |
39216033 | 713 | return 0; |
1da177e4 LT |
714 | } |
715 | ||
716 | /** | |
f64a181d | 717 | * scsi_add_lun - allocate and fully initialze a scsi_device |
6d877688 | 718 | * @sdev: holds information to be stored in the new scsi_device |
1da177e4 LT |
719 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
720 | * @bflags: black/white list flag | |
6d877688 | 721 | * @async: 1 if this device is being scanned asynchronously |
1da177e4 LT |
722 | * |
723 | * Description: | |
6d877688 MW |
724 | * Initialize the scsi_device @sdev. Optionally set fields based |
725 | * on values in *@bflags. | |
1da177e4 LT |
726 | * |
727 | * Return: | |
f64a181d CH |
728 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
729 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized | |
1da177e4 | 730 | **/ |
e5b3cd42 | 731 | static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result, |
3e082a91 | 732 | int *bflags, int async) |
1da177e4 | 733 | { |
6f4267e3 JB |
734 | int ret; |
735 | ||
1da177e4 LT |
736 | /* |
737 | * XXX do not save the inquiry, since it can change underneath us, | |
738 | * save just vendor/model/rev. | |
739 | * | |
740 | * Rather than save it and have an ioctl that retrieves the saved | |
741 | * value, have an ioctl that executes the same INQUIRY code used | |
742 | * in scsi_probe_lun, let user level programs doing INQUIRY | |
743 | * scanning run at their own risk, or supply a user level program | |
744 | * that can correctly scan. | |
745 | */ | |
09123d23 AS |
746 | |
747 | /* | |
748 | * Copy at least 36 bytes of INQUIRY data, so that we don't | |
749 | * dereference unallocated memory when accessing the Vendor, | |
750 | * Product, and Revision strings. Badly behaved devices may set | |
751 | * the INQUIRY Additional Length byte to a small value, indicating | |
752 | * these strings are invalid, but often they contain plausible data | |
753 | * nonetheless. It doesn't matter if the device sent < 36 bytes | |
754 | * total, since scsi_probe_lun() initializes inq_result with 0s. | |
755 | */ | |
756 | sdev->inquiry = kmemdup(inq_result, | |
757 | max_t(size_t, sdev->inquiry_len, 36), | |
758 | GFP_ATOMIC); | |
759 | if (sdev->inquiry == NULL) | |
1da177e4 | 760 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 | 761 | |
1da177e4 LT |
762 | sdev->vendor = (char *) (sdev->inquiry + 8); |
763 | sdev->model = (char *) (sdev->inquiry + 16); | |
764 | sdev->rev = (char *) (sdev->inquiry + 32); | |
765 | ||
766 | if (*bflags & BLIST_ISROM) { | |
6d877688 MW |
767 | sdev->type = TYPE_ROM; |
768 | sdev->removable = 1; | |
769 | } else { | |
770 | sdev->type = (inq_result[0] & 0x1f); | |
771 | sdev->removable = (inq_result[1] & 0x80) >> 7; | |
772 | } | |
1da177e4 | 773 | |
6d877688 | 774 | switch (sdev->type) { |
ddaf6fc8 | 775 | case TYPE_RBC: |
1da177e4 LT |
776 | case TYPE_TAPE: |
777 | case TYPE_DISK: | |
778 | case TYPE_PRINTER: | |
779 | case TYPE_MOD: | |
780 | case TYPE_PROCESSOR: | |
781 | case TYPE_SCANNER: | |
782 | case TYPE_MEDIUM_CHANGER: | |
783 | case TYPE_ENCLOSURE: | |
784 | case TYPE_COMM: | |
4d7db04a | 785 | case TYPE_RAID: |
1da177e4 LT |
786 | sdev->writeable = 1; |
787 | break; | |
1da177e4 | 788 | case TYPE_ROM: |
ddaf6fc8 | 789 | case TYPE_WORM: |
1da177e4 LT |
790 | sdev->writeable = 0; |
791 | break; | |
792 | default: | |
793 | printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); | |
794 | } | |
795 | ||
6d877688 MW |
796 | if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) { |
797 | /* RBC and MMC devices can return SCSI-3 compliance and yet | |
798 | * still not support REPORT LUNS, so make them act as | |
799 | * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is | |
800 | * specifically set */ | |
801 | if ((*bflags & BLIST_REPORTLUN2) == 0) | |
802 | *bflags |= BLIST_NOREPORTLUN; | |
803 | } | |
804 | ||
1da177e4 LT |
805 | /* |
806 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI | |
807 | * spec says: The device server is capable of supporting the | |
808 | * specified peripheral device type on this logical unit. However, | |
809 | * the physical device is not currently connected to this logical | |
810 | * unit. | |
811 | * | |
812 | * The above is vague, as it implies that we could treat 001 and | |
813 | * 011 the same. Stay compatible with previous code, and create a | |
f64a181d | 814 | * scsi_device for a PQ of 1 |
1da177e4 LT |
815 | * |
816 | * Don't set the device offline here; rather let the upper | |
817 | * level drivers eval the PQ to decide whether they should | |
818 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. | |
819 | */ | |
820 | ||
821 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; | |
1da177e4 LT |
822 | sdev->lockable = sdev->removable; |
823 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); | |
824 | ||
6d877688 MW |
825 | if (sdev->scsi_level >= SCSI_3 || |
826 | (sdev->inquiry_len > 56 && inq_result[56] & 0x04)) | |
1da177e4 LT |
827 | sdev->ppr = 1; |
828 | if (inq_result[7] & 0x60) | |
829 | sdev->wdtr = 1; | |
830 | if (inq_result[7] & 0x10) | |
831 | sdev->sdtr = 1; | |
832 | ||
19ac0db3 | 833 | sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d " |
4ff36718 MW |
834 | "ANSI: %d%s\n", scsi_device_type(sdev->type), |
835 | sdev->vendor, sdev->model, sdev->rev, | |
836 | sdev->inq_periph_qual, inq_result[2] & 0x07, | |
837 | (inq_result[3] & 0x0f) == 1 ? " CCS" : ""); | |
838 | ||
1da177e4 LT |
839 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
840 | !(*bflags & BLIST_NOTQ)) | |
841 | sdev->tagged_supported = 1; | |
6d877688 | 842 | |
1da177e4 LT |
843 | /* |
844 | * Some devices (Texel CD ROM drives) have handshaking problems | |
845 | * when used with the Seagate controllers. borken is initialized | |
846 | * to 1, and then set it to 0 here. | |
847 | */ | |
848 | if ((*bflags & BLIST_BORKEN) == 0) | |
849 | sdev->borken = 0; | |
850 | ||
6d877688 MW |
851 | if (*bflags & BLIST_NO_ULD_ATTACH) |
852 | sdev->no_uld_attach = 1; | |
853 | ||
1da177e4 LT |
854 | /* |
855 | * Apparently some really broken devices (contrary to the SCSI | |
856 | * standards) need to be selected without asserting ATN | |
857 | */ | |
858 | if (*bflags & BLIST_SELECT_NO_ATN) | |
859 | sdev->select_no_atn = 1; | |
860 | ||
4d7db04a JB |
861 | /* |
862 | * Maximum 512 sector transfer length | |
863 | * broken RA4x00 Compaq Disk Array | |
864 | */ | |
865 | if (*bflags & BLIST_MAX_512) | |
866 | blk_queue_max_sectors(sdev->request_queue, 512); | |
867 | ||
1da177e4 LT |
868 | /* |
869 | * Some devices may not want to have a start command automatically | |
870 | * issued when a device is added. | |
871 | */ | |
872 | if (*bflags & BLIST_NOSTARTONADD) | |
873 | sdev->no_start_on_add = 1; | |
874 | ||
875 | if (*bflags & BLIST_SINGLELUN) | |
25d7c363 | 876 | scsi_target(sdev)->single_lun = 1; |
1da177e4 | 877 | |
1da177e4 LT |
878 | sdev->use_10_for_rw = 1; |
879 | ||
880 | if (*bflags & BLIST_MS_SKIP_PAGE_08) | |
881 | sdev->skip_ms_page_8 = 1; | |
882 | ||
883 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) | |
884 | sdev->skip_ms_page_3f = 1; | |
885 | ||
886 | if (*bflags & BLIST_USE_10_BYTE_MS) | |
887 | sdev->use_10_for_ms = 1; | |
888 | ||
889 | /* set the device running here so that slave configure | |
890 | * may do I/O */ | |
6f4267e3 JB |
891 | ret = scsi_device_set_state(sdev, SDEV_RUNNING); |
892 | if (ret) { | |
893 | ret = scsi_device_set_state(sdev, SDEV_BLOCK); | |
894 | ||
895 | if (ret) { | |
896 | sdev_printk(KERN_ERR, sdev, | |
897 | "in wrong state %s to complete scan\n", | |
898 | scsi_device_state_name(sdev->sdev_state)); | |
899 | return SCSI_SCAN_NO_RESPONSE; | |
900 | } | |
901 | } | |
1da177e4 LT |
902 | |
903 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) | |
904 | sdev->use_192_bytes_for_3f = 1; | |
905 | ||
906 | if (*bflags & BLIST_NOT_LOCKABLE) | |
907 | sdev->lockable = 0; | |
908 | ||
909 | if (*bflags & BLIST_RETRY_HWERROR) | |
910 | sdev->retry_hwerror = 1; | |
911 | ||
912 | transport_configure_device(&sdev->sdev_gendev); | |
913 | ||
93805091 | 914 | if (sdev->host->hostt->slave_configure) { |
6f4267e3 | 915 | ret = sdev->host->hostt->slave_configure(sdev); |
93805091 CH |
916 | if (ret) { |
917 | /* | |
918 | * if LLDD reports slave not present, don't clutter | |
919 | * console with alloc failure messages | |
920 | */ | |
921 | if (ret != -ENXIO) { | |
922 | sdev_printk(KERN_ERR, sdev, | |
923 | "failed to configure device\n"); | |
924 | } | |
925 | return SCSI_SCAN_NO_RESPONSE; | |
926 | } | |
927 | } | |
1da177e4 LT |
928 | |
929 | /* | |
930 | * Ok, the device is now all set up, we can | |
931 | * register it and tell the rest of the kernel | |
932 | * about it. | |
933 | */ | |
3e082a91 | 934 | if (!async && scsi_sysfs_add_sdev(sdev) != 0) |
b24b1033 | 935 | return SCSI_SCAN_NO_RESPONSE; |
1da177e4 LT |
936 | |
937 | return SCSI_SCAN_LUN_PRESENT; | |
938 | } | |
939 | ||
6f3a2024 JB |
940 | static inline void scsi_destroy_sdev(struct scsi_device *sdev) |
941 | { | |
309bd271 | 942 | scsi_device_set_state(sdev, SDEV_DEL); |
6f3a2024 JB |
943 | if (sdev->host->hostt->slave_destroy) |
944 | sdev->host->hostt->slave_destroy(sdev); | |
945 | transport_destroy_device(&sdev->sdev_gendev); | |
946 | put_device(&sdev->sdev_gendev); | |
947 | } | |
948 | ||
c5f2e640 | 949 | #ifdef CONFIG_SCSI_LOGGING |
6c7154c9 | 950 | /** |
eb44820c | 951 | * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace |
6c7154c9 KG |
952 | * @buf: Output buffer with at least end-first+1 bytes of space |
953 | * @inq: Inquiry buffer (input) | |
954 | * @first: Offset of string into inq | |
955 | * @end: Index after last character in inq | |
956 | */ | |
c5f2e640 | 957 | static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq, |
6c7154c9 KG |
958 | unsigned first, unsigned end) |
959 | { | |
960 | unsigned term = 0, idx; | |
c5f2e640 | 961 | |
962 | for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) { | |
963 | if (inq[idx+first] > ' ') { | |
6c7154c9 KG |
964 | buf[idx] = inq[idx+first]; |
965 | term = idx+1; | |
966 | } else { | |
967 | buf[idx] = ' '; | |
968 | } | |
969 | } | |
970 | buf[term] = 0; | |
971 | return buf; | |
972 | } | |
c5f2e640 | 973 | #endif |
6f3a2024 | 974 | |
1da177e4 LT |
975 | /** |
976 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it | |
977 | * @starget: pointer to target device structure | |
978 | * @lun: LUN of target device | |
1da177e4 | 979 | * @bflagsp: store bflags here if not NULL |
eb44820c RL |
980 | * @sdevp: probe the LUN corresponding to this scsi_device |
981 | * @rescan: if nonzero skip some code only needed on first scan | |
982 | * @hostdata: passed to scsi_alloc_sdev() | |
1da177e4 LT |
983 | * |
984 | * Description: | |
985 | * Call scsi_probe_lun, if a LUN with an attached device is found, | |
986 | * allocate and set it up by calling scsi_add_lun. | |
987 | * | |
988 | * Return: | |
f64a181d | 989 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device |
1da177e4 LT |
990 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
991 | * attached at the LUN | |
f64a181d | 992 | * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized |
1da177e4 LT |
993 | **/ |
994 | static int scsi_probe_and_add_lun(struct scsi_target *starget, | |
995 | uint lun, int *bflagsp, | |
996 | struct scsi_device **sdevp, int rescan, | |
997 | void *hostdata) | |
998 | { | |
999 | struct scsi_device *sdev; | |
1da177e4 | 1000 | unsigned char *result; |
39216033 | 1001 | int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
1da177e4 LT |
1002 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
1003 | ||
1004 | /* | |
1005 | * The rescan flag is used as an optimization, the first scan of a | |
1006 | * host adapter calls into here with rescan == 0. | |
1007 | */ | |
6f3a2024 JB |
1008 | sdev = scsi_device_lookup_by_target(starget, lun); |
1009 | if (sdev) { | |
0f1d87a2 | 1010 | if (rescan || !scsi_device_created(sdev)) { |
1da177e4 LT |
1011 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
1012 | "scsi scan: device exists on %s\n", | |
1013 | sdev->sdev_gendev.bus_id)); | |
1014 | if (sdevp) | |
1015 | *sdevp = sdev; | |
1016 | else | |
1017 | scsi_device_put(sdev); | |
1018 | ||
1019 | if (bflagsp) | |
1020 | *bflagsp = scsi_get_device_flags(sdev, | |
1021 | sdev->vendor, | |
1022 | sdev->model); | |
1023 | return SCSI_SCAN_LUN_PRESENT; | |
1024 | } | |
6f3a2024 JB |
1025 | scsi_device_put(sdev); |
1026 | } else | |
1027 | sdev = scsi_alloc_sdev(starget, lun, hostdata); | |
1da177e4 LT |
1028 | if (!sdev) |
1029 | goto out; | |
39216033 JB |
1030 | |
1031 | result = kmalloc(result_len, GFP_ATOMIC | | |
bc86120a | 1032 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
1da177e4 | 1033 | if (!result) |
39216033 | 1034 | goto out_free_sdev; |
1da177e4 | 1035 | |
39216033 | 1036 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
1da177e4 LT |
1037 | goto out_free_result; |
1038 | ||
4186ab19 KG |
1039 | if (bflagsp) |
1040 | *bflagsp = bflags; | |
1da177e4 LT |
1041 | /* |
1042 | * result contains valid SCSI INQUIRY data. | |
1043 | */ | |
13f7e5ac | 1044 | if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) { |
1da177e4 LT |
1045 | /* |
1046 | * For a Peripheral qualifier 3 (011b), the SCSI | |
1047 | * spec says: The device server is not capable of | |
1048 | * supporting a physical device on this logical | |
1049 | * unit. | |
1050 | * | |
1051 | * For disks, this implies that there is no | |
1052 | * logical disk configured at sdev->lun, but there | |
1053 | * is a target id responding. | |
1054 | */ | |
6c7154c9 KG |
1055 | SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:" |
1056 | " peripheral qualifier of 3, device not" | |
1057 | " added\n")) | |
1058 | if (lun == 0) { | |
c5f2e640 | 1059 | SCSI_LOG_SCAN_BUS(1, { |
1060 | unsigned char vend[9]; | |
1061 | unsigned char mod[17]; | |
1062 | ||
1063 | sdev_printk(KERN_INFO, sdev, | |
6c7154c9 | 1064 | "scsi scan: consider passing scsi_mod." |
3424a65d | 1065 | "dev_flags=%s:%s:0x240 or 0x1000240\n", |
6c7154c9 | 1066 | scsi_inq_str(vend, result, 8, 16), |
c5f2e640 | 1067 | scsi_inq_str(mod, result, 16, 32)); |
1068 | }); | |
643eb2d9 | 1069 | |
6c7154c9 | 1070 | } |
643eb2d9 | 1071 | |
1da177e4 LT |
1072 | res = SCSI_SCAN_TARGET_PRESENT; |
1073 | goto out_free_result; | |
1074 | } | |
1075 | ||
1bfc5d9d | 1076 | /* |
84961f28 | 1077 | * Some targets may set slight variations of PQ and PDT to signal |
1078 | * that no LUN is present, so don't add sdev in these cases. | |
1079 | * Two specific examples are: | |
1080 | * 1) NetApp targets: return PQ=1, PDT=0x1f | |
1081 | * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved" | |
1082 | * in the UFI 1.0 spec (we cannot rely on reserved bits). | |
1083 | * | |
1084 | * References: | |
1085 | * 1) SCSI SPC-3, pp. 145-146 | |
1086 | * PQ=1: "A peripheral device having the specified peripheral | |
1087 | * device type is not connected to this logical unit. However, the | |
1088 | * device server is capable of supporting the specified peripheral | |
1089 | * device type on this logical unit." | |
1090 | * PDT=0x1f: "Unknown or no device type" | |
1091 | * 2) USB UFI 1.0, p. 20 | |
1092 | * PDT=00h Direct-access device (floppy) | |
1093 | * PDT=1Fh none (no FDD connected to the requested logical unit) | |
1bfc5d9d | 1094 | */ |
84961f28 | 1095 | if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) && |
01b291bd JB |
1096 | (result[0] & 0x1f) == 0x1f && |
1097 | !scsi_is_wlun(lun)) { | |
1bfc5d9d AS |
1098 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
1099 | "scsi scan: peripheral device type" | |
1100 | " of 31, no device added\n")); | |
1101 | res = SCSI_SCAN_TARGET_PRESENT; | |
1102 | goto out_free_result; | |
1103 | } | |
1104 | ||
3e082a91 | 1105 | res = scsi_add_lun(sdev, result, &bflags, shost->async_scan); |
1da177e4 LT |
1106 | if (res == SCSI_SCAN_LUN_PRESENT) { |
1107 | if (bflags & BLIST_KEY) { | |
1108 | sdev->lockable = 0; | |
39216033 | 1109 | scsi_unlock_floptical(sdev, result); |
1da177e4 | 1110 | } |
1da177e4 LT |
1111 | } |
1112 | ||
1113 | out_free_result: | |
1114 | kfree(result); | |
1da177e4 LT |
1115 | out_free_sdev: |
1116 | if (res == SCSI_SCAN_LUN_PRESENT) { | |
1117 | if (sdevp) { | |
b70d37bf AS |
1118 | if (scsi_device_get(sdev) == 0) { |
1119 | *sdevp = sdev; | |
1120 | } else { | |
1121 | __scsi_remove_device(sdev); | |
1122 | res = SCSI_SCAN_NO_RESPONSE; | |
1123 | } | |
1da177e4 | 1124 | } |
6f3a2024 JB |
1125 | } else |
1126 | scsi_destroy_sdev(sdev); | |
1da177e4 LT |
1127 | out: |
1128 | return res; | |
1129 | } | |
1130 | ||
1131 | /** | |
1132 | * scsi_sequential_lun_scan - sequentially scan a SCSI target | |
1133 | * @starget: pointer to target structure to scan | |
1134 | * @bflags: black/white list flag for LUN 0 | |
eb44820c RL |
1135 | * @scsi_level: Which version of the standard does this device adhere to |
1136 | * @rescan: passed to scsi_probe_add_lun() | |
1da177e4 LT |
1137 | * |
1138 | * Description: | |
1139 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been | |
1140 | * scanned) to some maximum lun until a LUN is found with no device | |
1141 | * attached. Use the bflags to figure out any oddities. | |
1142 | * | |
1143 | * Modifies sdevscan->lun. | |
1144 | **/ | |
1145 | static void scsi_sequential_lun_scan(struct scsi_target *starget, | |
4186ab19 | 1146 | int bflags, int scsi_level, int rescan) |
1da177e4 LT |
1147 | { |
1148 | unsigned int sparse_lun, lun, max_dev_lun; | |
1149 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1150 | ||
1151 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" | |
1152 | "%s\n", starget->dev.bus_id)); | |
1153 | ||
1154 | max_dev_lun = min(max_scsi_luns, shost->max_lun); | |
1155 | /* | |
1156 | * If this device is known to support sparse multiple units, | |
1157 | * override the other settings, and scan all of them. Normally, | |
1158 | * SCSI-3 devices should be scanned via the REPORT LUNS. | |
1159 | */ | |
1160 | if (bflags & BLIST_SPARSELUN) { | |
1161 | max_dev_lun = shost->max_lun; | |
1162 | sparse_lun = 1; | |
1163 | } else | |
1164 | sparse_lun = 0; | |
1165 | ||
1da177e4 LT |
1166 | /* |
1167 | * If less than SCSI_1_CSS, and no special lun scaning, stop | |
1168 | * scanning; this matches 2.4 behaviour, but could just be a bug | |
1169 | * (to continue scanning a SCSI_1_CSS device). | |
1170 | * | |
1171 | * This test is broken. We might not have any device on lun0 for | |
1172 | * a sparselun device, and if that's the case then how would we | |
1173 | * know the real scsi_level, eh? It might make sense to just not | |
1174 | * scan any SCSI_1 device for non-0 luns, but that check would best | |
1175 | * go into scsi_alloc_sdev() and just have it return null when asked | |
1176 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. | |
1177 | * | |
1178 | if ((sdevscan->scsi_level < SCSI_1_CCS) && | |
1179 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) | |
1180 | == 0)) | |
1181 | return; | |
1182 | */ | |
1183 | /* | |
1184 | * If this device is known to support multiple units, override | |
1185 | * the other settings, and scan all of them. | |
1186 | */ | |
1187 | if (bflags & BLIST_FORCELUN) | |
1188 | max_dev_lun = shost->max_lun; | |
1189 | /* | |
1190 | * REGAL CDC-4X: avoid hang after LUN 4 | |
1191 | */ | |
1192 | if (bflags & BLIST_MAX5LUN) | |
1193 | max_dev_lun = min(5U, max_dev_lun); | |
1194 | /* | |
1195 | * Do not scan SCSI-2 or lower device past LUN 7, unless | |
1196 | * BLIST_LARGELUN. | |
1197 | */ | |
1198 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) | |
1199 | max_dev_lun = min(8U, max_dev_lun); | |
1200 | ||
1201 | /* | |
1202 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning | |
1203 | * until we reach the max, or no LUN is found and we are not | |
1204 | * sparse_lun. | |
1205 | */ | |
1206 | for (lun = 1; lun < max_dev_lun; ++lun) | |
1207 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, | |
1208 | NULL) != SCSI_SCAN_LUN_PRESENT) && | |
1209 | !sparse_lun) | |
1210 | return; | |
1211 | } | |
1212 | ||
1213 | /** | |
1214 | * scsilun_to_int: convert a scsi_lun to an int | |
1215 | * @scsilun: struct scsi_lun to be converted. | |
1216 | * | |
1217 | * Description: | |
1218 | * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered | |
1219 | * integer, and return the result. The caller must check for | |
1220 | * truncation before using this function. | |
1221 | * | |
1222 | * Notes: | |
1223 | * The struct scsi_lun is assumed to be four levels, with each level | |
1224 | * effectively containing a SCSI byte-ordered (big endian) short; the | |
1225 | * addressing bits of each level are ignored (the highest two bits). | |
1226 | * For a description of the LUN format, post SCSI-3 see the SCSI | |
1227 | * Architecture Model, for SCSI-3 see the SCSI Controller Commands. | |
1228 | * | |
1229 | * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns | |
1230 | * the integer: 0x0b030a04 | |
1231 | **/ | |
462b7859 | 1232 | int scsilun_to_int(struct scsi_lun *scsilun) |
1da177e4 LT |
1233 | { |
1234 | int i; | |
1235 | unsigned int lun; | |
1236 | ||
1237 | lun = 0; | |
1238 | for (i = 0; i < sizeof(lun); i += 2) | |
1239 | lun = lun | (((scsilun->scsi_lun[i] << 8) | | |
1240 | scsilun->scsi_lun[i + 1]) << (i * 8)); | |
1241 | return lun; | |
1242 | } | |
462b7859 | 1243 | EXPORT_SYMBOL(scsilun_to_int); |
1da177e4 | 1244 | |
2f4701d8 JSEC |
1245 | /** |
1246 | * int_to_scsilun: reverts an int into a scsi_lun | |
eb44820c | 1247 | * @lun: integer to be reverted |
2f4701d8 JSEC |
1248 | * @scsilun: struct scsi_lun to be set. |
1249 | * | |
1250 | * Description: | |
1251 | * Reverts the functionality of the scsilun_to_int, which packed | |
1252 | * an 8-byte lun value into an int. This routine unpacks the int | |
1253 | * back into the lun value. | |
1254 | * Note: the scsilun_to_int() routine does not truly handle all | |
1255 | * 8bytes of the lun value. This functions restores only as much | |
1256 | * as was set by the routine. | |
1257 | * | |
1258 | * Notes: | |
1259 | * Given an integer : 0x0b030a04, this function returns a | |
1260 | * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 | |
1261 | * | |
1262 | **/ | |
1263 | void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) | |
1264 | { | |
1265 | int i; | |
1266 | ||
1267 | memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); | |
1268 | ||
1269 | for (i = 0; i < sizeof(lun); i += 2) { | |
1270 | scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; | |
1271 | scsilun->scsi_lun[i+1] = lun & 0xFF; | |
1272 | lun = lun >> 16; | |
1273 | } | |
1274 | } | |
1275 | EXPORT_SYMBOL(int_to_scsilun); | |
1276 | ||
1da177e4 LT |
1277 | /** |
1278 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results | |
eb44820c RL |
1279 | * @starget: which target |
1280 | * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN | |
1281 | * @rescan: nonzero if we can skip code only needed on first scan | |
1da177e4 LT |
1282 | * |
1283 | * Description: | |
eb44820c RL |
1284 | * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command. |
1285 | * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun. | |
1da177e4 | 1286 | * |
eb44820c RL |
1287 | * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8 |
1288 | * LUNs even if it's older than SCSI-3. | |
1289 | * If BLIST_NOREPORTLUN is set, return 1 always. | |
1290 | * If BLIST_NOLUN is set, return 0 always. | |
1da177e4 LT |
1291 | * |
1292 | * Return: | |
1293 | * 0: scan completed (or no memory, so further scanning is futile) | |
eb44820c | 1294 | * 1: could not scan with REPORT LUN |
1da177e4 | 1295 | **/ |
6f3a2024 | 1296 | static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, |
1da177e4 LT |
1297 | int rescan) |
1298 | { | |
1299 | char devname[64]; | |
1300 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; | |
1301 | unsigned int length; | |
1302 | unsigned int lun; | |
1303 | unsigned int num_luns; | |
1304 | unsigned int retries; | |
39216033 | 1305 | int result; |
1da177e4 | 1306 | struct scsi_lun *lunp, *lun_data; |
1da177e4 LT |
1307 | u8 *data; |
1308 | struct scsi_sense_hdr sshdr; | |
6f3a2024 JB |
1309 | struct scsi_device *sdev; |
1310 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); | |
2ef89198 | 1311 | int ret = 0; |
1da177e4 LT |
1312 | |
1313 | /* | |
1314 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. | |
1315 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does | |
1316 | * support more than 8 LUNs. | |
1317 | */ | |
4d7db04a JB |
1318 | if (bflags & BLIST_NOREPORTLUN) |
1319 | return 1; | |
1320 | if (starget->scsi_level < SCSI_2 && | |
1321 | starget->scsi_level != SCSI_UNKNOWN) | |
1322 | return 1; | |
1323 | if (starget->scsi_level < SCSI_3 && | |
1324 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) | |
1da177e4 LT |
1325 | return 1; |
1326 | if (bflags & BLIST_NOLUN) | |
1327 | return 0; | |
1328 | ||
6f3a2024 JB |
1329 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
1330 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1331 | if (!sdev) | |
1332 | return 0; | |
1333 | if (scsi_device_get(sdev)) | |
1334 | return 0; | |
1335 | } | |
1336 | ||
1da177e4 | 1337 | sprintf(devname, "host %d channel %d id %d", |
6f3a2024 | 1338 | shost->host_no, sdev->channel, sdev->id); |
1da177e4 LT |
1339 | |
1340 | /* | |
1341 | * Allocate enough to hold the header (the same size as one scsi_lun) | |
1342 | * plus the max number of luns we are requesting. | |
1343 | * | |
1344 | * Reallocating and trying again (with the exact amount we need) | |
1345 | * would be nice, but then we need to somehow limit the size | |
1346 | * allocated based on the available memory and the limits of | |
1347 | * kmalloc - we don't want a kmalloc() failure of a huge value to | |
1348 | * prevent us from finding any LUNs on this target. | |
1349 | */ | |
1350 | length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); | |
1351 | lun_data = kmalloc(length, GFP_ATOMIC | | |
1352 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); | |
6f3a2024 | 1353 | if (!lun_data) { |
cadbd4a5 | 1354 | printk(ALLOC_FAILURE_MSG, __func__); |
39216033 | 1355 | goto out; |
6f3a2024 | 1356 | } |
1da177e4 LT |
1357 | |
1358 | scsi_cmd[0] = REPORT_LUNS; | |
1359 | ||
1360 | /* | |
1361 | * bytes 1 - 5: reserved, set to zero. | |
1362 | */ | |
1363 | memset(&scsi_cmd[1], 0, 5); | |
1364 | ||
1365 | /* | |
1366 | * bytes 6 - 9: length of the command. | |
1367 | */ | |
1368 | scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; | |
1369 | scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; | |
1370 | scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; | |
1371 | scsi_cmd[9] = (unsigned char) length & 0xff; | |
1372 | ||
1373 | scsi_cmd[10] = 0; /* reserved */ | |
1374 | scsi_cmd[11] = 0; /* control */ | |
1da177e4 LT |
1375 | |
1376 | /* | |
1377 | * We can get a UNIT ATTENTION, for example a power on/reset, so | |
1378 | * retry a few times (like sd.c does for TEST UNIT READY). | |
1379 | * Experience shows some combinations of adapter/devices get at | |
1380 | * least two power on/resets. | |
1381 | * | |
1382 | * Illegal requests (for devices that do not support REPORT LUNS) | |
1383 | * should come through as a check condition, and will not generate | |
1384 | * a retry. | |
1385 | */ | |
1386 | for (retries = 0; retries < 3; retries++) { | |
1387 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" | |
1388 | " REPORT LUNS to %s (try %d)\n", devname, | |
1389 | retries)); | |
39216033 | 1390 | |
39216033 | 1391 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
ea73a9f2 | 1392 | lun_data, length, &sshdr, |
39216033 JB |
1393 | SCSI_TIMEOUT + 4 * HZ, 3); |
1394 | ||
1da177e4 | 1395 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" |
39216033 JB |
1396 | " %s (try %d) result 0x%x\n", result |
1397 | ? "failed" : "successful", retries, result)); | |
1398 | if (result == 0) | |
1da177e4 | 1399 | break; |
ea73a9f2 | 1400 | else if (scsi_sense_valid(&sshdr)) { |
1da177e4 LT |
1401 | if (sshdr.sense_key != UNIT_ATTENTION) |
1402 | break; | |
1403 | } | |
1404 | } | |
1405 | ||
39216033 | 1406 | if (result) { |
1da177e4 LT |
1407 | /* |
1408 | * The device probably does not support a REPORT LUN command | |
1409 | */ | |
2ef89198 AS |
1410 | ret = 1; |
1411 | goto out_err; | |
1da177e4 | 1412 | } |
1da177e4 LT |
1413 | |
1414 | /* | |
1415 | * Get the length from the first four bytes of lun_data. | |
1416 | */ | |
1417 | data = (u8 *) lun_data->scsi_lun; | |
1418 | length = ((data[0] << 24) | (data[1] << 16) | | |
1419 | (data[2] << 8) | (data[3] << 0)); | |
1420 | ||
1421 | num_luns = (length / sizeof(struct scsi_lun)); | |
1422 | if (num_luns > max_scsi_report_luns) { | |
1423 | printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" | |
1424 | " of %d luns reported, try increasing" | |
1425 | " max_scsi_report_luns.\n", devname, | |
1426 | max_scsi_report_luns, num_luns); | |
1427 | num_luns = max_scsi_report_luns; | |
1428 | } | |
1429 | ||
3bf743e7 JG |
1430 | SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, |
1431 | "scsi scan: REPORT LUN scan\n")); | |
1da177e4 LT |
1432 | |
1433 | /* | |
1434 | * Scan the luns in lun_data. The entry at offset 0 is really | |
1435 | * the header, so start at 1 and go up to and including num_luns. | |
1436 | */ | |
1437 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { | |
1438 | lun = scsilun_to_int(lunp); | |
1439 | ||
1440 | /* | |
1441 | * Check if the unused part of lunp is non-zero, and so | |
1442 | * does not fit in lun. | |
1443 | */ | |
1444 | if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { | |
1445 | int i; | |
1446 | ||
1447 | /* | |
1448 | * Output an error displaying the LUN in byte order, | |
1449 | * this differs from what linux would print for the | |
1450 | * integer LUN value. | |
1451 | */ | |
1452 | printk(KERN_WARNING "scsi: %s lun 0x", devname); | |
1453 | data = (char *)lunp->scsi_lun; | |
1454 | for (i = 0; i < sizeof(struct scsi_lun); i++) | |
1455 | printk("%02x", data[i]); | |
1456 | printk(" has a LUN larger than currently supported.\n"); | |
1da177e4 LT |
1457 | } else if (lun > sdev->host->max_lun) { |
1458 | printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" | |
1459 | " than allowed by the host adapter\n", | |
1460 | devname, lun); | |
1461 | } else { | |
1462 | int res; | |
1463 | ||
1464 | res = scsi_probe_and_add_lun(starget, | |
1465 | lun, NULL, NULL, rescan, NULL); | |
1466 | if (res == SCSI_SCAN_NO_RESPONSE) { | |
1467 | /* | |
1468 | * Got some results, but now none, abort. | |
1469 | */ | |
3bf743e7 JG |
1470 | sdev_printk(KERN_ERR, sdev, |
1471 | "Unexpected response" | |
1472 | " from lun %d while scanning, scan" | |
1473 | " aborted\n", lun); | |
1da177e4 LT |
1474 | break; |
1475 | } | |
1476 | } | |
1477 | } | |
1478 | ||
2ef89198 | 1479 | out_err: |
1da177e4 | 1480 | kfree(lun_data); |
1da177e4 | 1481 | out: |
6f3a2024 | 1482 | scsi_device_put(sdev); |
0f1d87a2 | 1483 | if (scsi_device_created(sdev)) |
6f3a2024 JB |
1484 | /* |
1485 | * the sdev we used didn't appear in the report luns scan | |
1486 | */ | |
1487 | scsi_destroy_sdev(sdev); | |
2ef89198 | 1488 | return ret; |
1da177e4 LT |
1489 | } |
1490 | ||
1491 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, | |
1492 | uint id, uint lun, void *hostdata) | |
1493 | { | |
a97a83a0 | 1494 | struct scsi_device *sdev = ERR_PTR(-ENODEV); |
1da177e4 | 1495 | struct device *parent = &shost->shost_gendev; |
e02f3f59 | 1496 | struct scsi_target *starget; |
1da177e4 | 1497 | |
938e2ac0 MW |
1498 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1499 | return ERR_PTR(-ENODEV); | |
1500 | ||
e02f3f59 | 1501 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1502 | if (!starget) |
1503 | return ERR_PTR(-ENOMEM); | |
1504 | ||
0b950672 | 1505 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1506 | if (!shost->async_scan) |
1507 | scsi_complete_async_scans(); | |
1508 | ||
a97a83a0 MW |
1509 | if (scsi_host_scan_allowed(shost)) |
1510 | scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); | |
0b950672 | 1511 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1512 | scsi_target_reap(starget); |
1513 | put_device(&starget->dev); | |
1514 | ||
1515 | return sdev; | |
1516 | } | |
1517 | EXPORT_SYMBOL(__scsi_add_device); | |
1518 | ||
146f7262 JB |
1519 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
1520 | uint target, uint lun) | |
1521 | { | |
1522 | struct scsi_device *sdev = | |
1523 | __scsi_add_device(host, channel, target, lun, NULL); | |
1524 | if (IS_ERR(sdev)) | |
1525 | return PTR_ERR(sdev); | |
1526 | ||
1527 | scsi_device_put(sdev); | |
1528 | return 0; | |
1529 | } | |
1530 | EXPORT_SYMBOL(scsi_add_device); | |
1531 | ||
1da177e4 LT |
1532 | void scsi_rescan_device(struct device *dev) |
1533 | { | |
1534 | struct scsi_driver *drv; | |
1535 | ||
1536 | if (!dev->driver) | |
1537 | return; | |
1538 | ||
1539 | drv = to_scsi_driver(dev->driver); | |
1540 | if (try_module_get(drv->owner)) { | |
1541 | if (drv->rescan) | |
1542 | drv->rescan(dev); | |
1543 | module_put(drv->owner); | |
1544 | } | |
1545 | } | |
1546 | EXPORT_SYMBOL(scsi_rescan_device); | |
1547 | ||
e517d313 AS |
1548 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
1549 | unsigned int id, unsigned int lun, int rescan) | |
1da177e4 LT |
1550 | { |
1551 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1552 | int bflags = 0; | |
1553 | int res; | |
1da177e4 LT |
1554 | struct scsi_target *starget; |
1555 | ||
1556 | if (shost->this_id == id) | |
1557 | /* | |
1558 | * Don't scan the host adapter | |
1559 | */ | |
1560 | return; | |
1561 | ||
1da177e4 | 1562 | starget = scsi_alloc_target(parent, channel, id); |
1da177e4 LT |
1563 | if (!starget) |
1564 | return; | |
1565 | ||
1da177e4 LT |
1566 | if (lun != SCAN_WILD_CARD) { |
1567 | /* | |
1568 | * Scan for a specific host/chan/id/lun. | |
1569 | */ | |
1570 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); | |
1571 | goto out_reap; | |
1572 | } | |
1573 | ||
1574 | /* | |
1575 | * Scan LUN 0, if there is some response, scan further. Ideally, we | |
1576 | * would not configure LUN 0 until all LUNs are scanned. | |
1577 | */ | |
6f3a2024 JB |
1578 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
1579 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { | |
1580 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) | |
1da177e4 LT |
1581 | /* |
1582 | * The REPORT LUN did not scan the target, | |
1583 | * do a sequential scan. | |
1584 | */ | |
1585 | scsi_sequential_lun_scan(starget, bflags, | |
4186ab19 | 1586 | starget->scsi_level, rescan); |
1da177e4 | 1587 | } |
1da177e4 LT |
1588 | |
1589 | out_reap: | |
1590 | /* now determine if the target has any children at all | |
1591 | * and if not, nuke it */ | |
1592 | scsi_target_reap(starget); | |
1593 | ||
1594 | put_device(&starget->dev); | |
1595 | } | |
e517d313 AS |
1596 | |
1597 | /** | |
e59e4a09 | 1598 | * scsi_scan_target - scan a target id, possibly including all LUNs on the target. |
e517d313 AS |
1599 | * @parent: host to scan |
1600 | * @channel: channel to scan | |
1601 | * @id: target id to scan | |
1602 | * @lun: Specific LUN to scan or SCAN_WILD_CARD | |
1603 | * @rescan: passed to LUN scanning routines | |
1604 | * | |
1605 | * Description: | |
1606 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, | |
1607 | * and possibly all LUNs on the target id. | |
1608 | * | |
1609 | * First try a REPORT LUN scan, if that does not scan the target, do a | |
1610 | * sequential scan of LUNs on the target id. | |
1611 | **/ | |
1612 | void scsi_scan_target(struct device *parent, unsigned int channel, | |
1613 | unsigned int id, unsigned int lun, int rescan) | |
1614 | { | |
1615 | struct Scsi_Host *shost = dev_to_shost(parent); | |
1616 | ||
93b45af5 MW |
1617 | if (strncmp(scsi_scan_type, "none", 4) == 0) |
1618 | return; | |
1619 | ||
6b7f123f | 1620 | mutex_lock(&shost->scan_mutex); |
3e082a91 MW |
1621 | if (!shost->async_scan) |
1622 | scsi_complete_async_scans(); | |
1623 | ||
e517d313 AS |
1624 | if (scsi_host_scan_allowed(shost)) |
1625 | __scsi_scan_target(parent, channel, id, lun, rescan); | |
0b950672 | 1626 | mutex_unlock(&shost->scan_mutex); |
e517d313 | 1627 | } |
1da177e4 LT |
1628 | EXPORT_SYMBOL(scsi_scan_target); |
1629 | ||
1630 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, | |
1631 | unsigned int id, unsigned int lun, int rescan) | |
1632 | { | |
1633 | uint order_id; | |
1634 | ||
1635 | if (id == SCAN_WILD_CARD) | |
1636 | for (id = 0; id < shost->max_id; ++id) { | |
1637 | /* | |
1638 | * XXX adapter drivers when possible (FCP, iSCSI) | |
1639 | * could modify max_id to match the current max, | |
1640 | * not the absolute max. | |
1641 | * | |
1642 | * XXX add a shost id iterator, so for example, | |
1643 | * the FC ID can be the same as a target id | |
1644 | * without a huge overhead of sparse id's. | |
1645 | */ | |
1646 | if (shost->reverse_ordering) | |
1647 | /* | |
1648 | * Scan from high to low id. | |
1649 | */ | |
1650 | order_id = shost->max_id - id - 1; | |
1651 | else | |
1652 | order_id = id; | |
e517d313 AS |
1653 | __scsi_scan_target(&shost->shost_gendev, channel, |
1654 | order_id, lun, rescan); | |
1da177e4 LT |
1655 | } |
1656 | else | |
e517d313 AS |
1657 | __scsi_scan_target(&shost->shost_gendev, channel, |
1658 | id, lun, rescan); | |
1da177e4 LT |
1659 | } |
1660 | ||
1661 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, | |
1662 | unsigned int id, unsigned int lun, int rescan) | |
1663 | { | |
3bf743e7 JG |
1664 | SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, |
1665 | "%s: <%u:%u:%u>\n", | |
cadbd4a5 | 1666 | __func__, channel, id, lun)); |
1da177e4 LT |
1667 | |
1668 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || | |
091686d3 | 1669 | ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) || |
1da177e4 LT |
1670 | ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) |
1671 | return -EINVAL; | |
1672 | ||
0b950672 | 1673 | mutex_lock(&shost->scan_mutex); |
6b7f123f MW |
1674 | if (!shost->async_scan) |
1675 | scsi_complete_async_scans(); | |
1676 | ||
82f29467 MA |
1677 | if (scsi_host_scan_allowed(shost)) { |
1678 | if (channel == SCAN_WILD_CARD) | |
1679 | for (channel = 0; channel <= shost->max_channel; | |
1680 | channel++) | |
1681 | scsi_scan_channel(shost, channel, id, lun, | |
1682 | rescan); | |
1683 | else | |
1da177e4 | 1684 | scsi_scan_channel(shost, channel, id, lun, rescan); |
82f29467 | 1685 | } |
0b950672 | 1686 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1687 | |
1688 | return 0; | |
1689 | } | |
1690 | ||
3e082a91 MW |
1691 | static void scsi_sysfs_add_devices(struct Scsi_Host *shost) |
1692 | { | |
1693 | struct scsi_device *sdev; | |
1694 | shost_for_each_device(sdev, shost) { | |
6b7f123f MW |
1695 | if (!scsi_host_scan_allowed(shost) || |
1696 | scsi_sysfs_add_sdev(sdev) != 0) | |
3e082a91 MW |
1697 | scsi_destroy_sdev(sdev); |
1698 | } | |
1699 | } | |
1700 | ||
1701 | /** | |
1702 | * scsi_prep_async_scan - prepare for an async scan | |
1703 | * @shost: the host which will be scanned | |
1704 | * Returns: a cookie to be passed to scsi_finish_async_scan() | |
1705 | * | |
1706 | * Tells the midlayer this host is going to do an asynchronous scan. | |
1707 | * It reserves the host's position in the scanning list and ensures | |
1708 | * that other asynchronous scans started after this one won't affect the | |
1709 | * ordering of the discovered devices. | |
1710 | */ | |
1aa8fab2 | 1711 | static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost) |
3e082a91 MW |
1712 | { |
1713 | struct async_scan_data *data; | |
6b7f123f | 1714 | unsigned long flags; |
3e082a91 MW |
1715 | |
1716 | if (strncmp(scsi_scan_type, "sync", 4) == 0) | |
1717 | return NULL; | |
1718 | ||
1719 | if (shost->async_scan) { | |
cadbd4a5 | 1720 | printk("%s called twice for host %d", __func__, |
3e082a91 MW |
1721 | shost->host_no); |
1722 | dump_stack(); | |
1723 | return NULL; | |
1724 | } | |
1725 | ||
1726 | data = kmalloc(sizeof(*data), GFP_KERNEL); | |
1727 | if (!data) | |
1728 | goto err; | |
1729 | data->shost = scsi_host_get(shost); | |
1730 | if (!data->shost) | |
1731 | goto err; | |
1732 | init_completion(&data->prev_finished); | |
1733 | ||
6b7f123f MW |
1734 | mutex_lock(&shost->scan_mutex); |
1735 | spin_lock_irqsave(shost->host_lock, flags); | |
3e082a91 | 1736 | shost->async_scan = 1; |
6b7f123f MW |
1737 | spin_unlock_irqrestore(shost->host_lock, flags); |
1738 | mutex_unlock(&shost->scan_mutex); | |
1739 | ||
1740 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1741 | if (list_empty(&scanning_hosts)) |
1742 | complete(&data->prev_finished); | |
1743 | list_add_tail(&data->list, &scanning_hosts); | |
1744 | spin_unlock(&async_scan_lock); | |
1745 | ||
1746 | return data; | |
1747 | ||
1748 | err: | |
1749 | kfree(data); | |
1750 | return NULL; | |
1751 | } | |
1752 | ||
1753 | /** | |
1754 | * scsi_finish_async_scan - asynchronous scan has finished | |
1755 | * @data: cookie returned from earlier call to scsi_prep_async_scan() | |
1756 | * | |
1757 | * All the devices currently attached to this host have been found. | |
1758 | * This function announces all the devices it has found to the rest | |
1759 | * of the system. | |
1760 | */ | |
1aa8fab2 | 1761 | static void scsi_finish_async_scan(struct async_scan_data *data) |
3e082a91 MW |
1762 | { |
1763 | struct Scsi_Host *shost; | |
6b7f123f | 1764 | unsigned long flags; |
3e082a91 MW |
1765 | |
1766 | if (!data) | |
1767 | return; | |
1768 | ||
1769 | shost = data->shost; | |
6b7f123f MW |
1770 | |
1771 | mutex_lock(&shost->scan_mutex); | |
1772 | ||
3e082a91 | 1773 | if (!shost->async_scan) { |
cadbd4a5 | 1774 | printk("%s called twice for host %d", __func__, |
3e082a91 MW |
1775 | shost->host_no); |
1776 | dump_stack(); | |
773e82f6 | 1777 | mutex_unlock(&shost->scan_mutex); |
3e082a91 MW |
1778 | return; |
1779 | } | |
1780 | ||
1781 | wait_for_completion(&data->prev_finished); | |
1782 | ||
1783 | scsi_sysfs_add_devices(shost); | |
1784 | ||
6b7f123f | 1785 | spin_lock_irqsave(shost->host_lock, flags); |
3e082a91 | 1786 | shost->async_scan = 0; |
6b7f123f MW |
1787 | spin_unlock_irqrestore(shost->host_lock, flags); |
1788 | ||
1789 | mutex_unlock(&shost->scan_mutex); | |
1790 | ||
1791 | spin_lock(&async_scan_lock); | |
3e082a91 MW |
1792 | list_del(&data->list); |
1793 | if (!list_empty(&scanning_hosts)) { | |
1794 | struct async_scan_data *next = list_entry(scanning_hosts.next, | |
1795 | struct async_scan_data, list); | |
1796 | complete(&next->prev_finished); | |
1797 | } | |
1798 | spin_unlock(&async_scan_lock); | |
1799 | ||
1800 | scsi_host_put(shost); | |
1801 | kfree(data); | |
1802 | } | |
1803 | ||
1aa8fab2 | 1804 | static void do_scsi_scan_host(struct Scsi_Host *shost) |
3e082a91 | 1805 | { |
1aa8fab2 MW |
1806 | if (shost->hostt->scan_finished) { |
1807 | unsigned long start = jiffies; | |
1808 | if (shost->hostt->scan_start) | |
1809 | shost->hostt->scan_start(shost); | |
1810 | ||
1811 | while (!shost->hostt->scan_finished(shost, jiffies - start)) | |
1812 | msleep(10); | |
1813 | } else { | |
1814 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, | |
3e082a91 | 1815 | SCAN_WILD_CARD, 0); |
1aa8fab2 MW |
1816 | } |
1817 | } | |
3e082a91 | 1818 | |
1aa8fab2 MW |
1819 | static int do_scan_async(void *_data) |
1820 | { | |
1821 | struct async_scan_data *data = _data; | |
1822 | do_scsi_scan_host(data->shost); | |
3e082a91 MW |
1823 | scsi_finish_async_scan(data); |
1824 | return 0; | |
1825 | } | |
1826 | ||
1da177e4 LT |
1827 | /** |
1828 | * scsi_scan_host - scan the given adapter | |
1829 | * @shost: adapter to scan | |
1830 | **/ | |
1831 | void scsi_scan_host(struct Scsi_Host *shost) | |
1832 | { | |
a57b1fcc | 1833 | struct task_struct *p; |
3e082a91 MW |
1834 | struct async_scan_data *data; |
1835 | ||
1836 | if (strncmp(scsi_scan_type, "none", 4) == 0) | |
1837 | return; | |
1838 | ||
1839 | data = scsi_prep_async_scan(shost); | |
1840 | if (!data) { | |
1aa8fab2 | 1841 | do_scsi_scan_host(shost); |
3e082a91 MW |
1842 | return; |
1843 | } | |
1aa8fab2 | 1844 | |
a57b1fcc | 1845 | p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no); |
801678c5 | 1846 | if (IS_ERR(p)) |
a57b1fcc | 1847 | do_scan_async(data); |
1da177e4 LT |
1848 | } |
1849 | EXPORT_SYMBOL(scsi_scan_host); | |
1850 | ||
1da177e4 LT |
1851 | void scsi_forget_host(struct Scsi_Host *shost) |
1852 | { | |
a64358db | 1853 | struct scsi_device *sdev; |
1da177e4 LT |
1854 | unsigned long flags; |
1855 | ||
a64358db | 1856 | restart: |
1da177e4 | 1857 | spin_lock_irqsave(shost->host_lock, flags); |
a64358db AS |
1858 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
1859 | if (sdev->sdev_state == SDEV_DEL) | |
1860 | continue; | |
1da177e4 | 1861 | spin_unlock_irqrestore(shost->host_lock, flags); |
a64358db AS |
1862 | __scsi_remove_device(sdev); |
1863 | goto restart; | |
1da177e4 LT |
1864 | } |
1865 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1866 | } | |
1867 | ||
1868 | /* | |
1869 | * Function: scsi_get_host_dev() | |
1870 | * | |
f64a181d | 1871 | * Purpose: Create a scsi_device that points to the host adapter itself. |
1da177e4 | 1872 | * |
f64a181d | 1873 | * Arguments: SHpnt - Host that needs a scsi_device |
1da177e4 LT |
1874 | * |
1875 | * Lock status: None assumed. | |
1876 | * | |
f64a181d | 1877 | * Returns: The scsi_device or NULL |
1da177e4 LT |
1878 | * |
1879 | * Notes: | |
f64a181d | 1880 | * Attach a single scsi_device to the Scsi_Host - this should |
1da177e4 LT |
1881 | * be made to look like a "pseudo-device" that points to the |
1882 | * HA itself. | |
1883 | * | |
1884 | * Note - this device is not accessible from any high-level | |
1885 | * drivers (including generics), which is probably not | |
1886 | * optimal. We can add hooks later to attach | |
1887 | */ | |
1888 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) | |
1889 | { | |
e517d313 | 1890 | struct scsi_device *sdev = NULL; |
1da177e4 LT |
1891 | struct scsi_target *starget; |
1892 | ||
0b950672 | 1893 | mutex_lock(&shost->scan_mutex); |
e517d313 AS |
1894 | if (!scsi_host_scan_allowed(shost)) |
1895 | goto out; | |
1da177e4 LT |
1896 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
1897 | if (!starget) | |
e517d313 | 1898 | goto out; |
1da177e4 LT |
1899 | |
1900 | sdev = scsi_alloc_sdev(starget, 0, NULL); | |
1901 | if (sdev) { | |
1902 | sdev->sdev_gendev.parent = get_device(&starget->dev); | |
1903 | sdev->borken = 0; | |
884d25cc JB |
1904 | } else |
1905 | scsi_target_reap(starget); | |
1da177e4 | 1906 | put_device(&starget->dev); |
e517d313 | 1907 | out: |
0b950672 | 1908 | mutex_unlock(&shost->scan_mutex); |
1da177e4 LT |
1909 | return sdev; |
1910 | } | |
1911 | EXPORT_SYMBOL(scsi_get_host_dev); | |
1912 | ||
1913 | /* | |
1914 | * Function: scsi_free_host_dev() | |
1915 | * | |
1916 | * Purpose: Free a scsi_device that points to the host adapter itself. | |
1917 | * | |
f64a181d | 1918 | * Arguments: SHpnt - Host that needs a scsi_device |
1da177e4 LT |
1919 | * |
1920 | * Lock status: None assumed. | |
1921 | * | |
1922 | * Returns: Nothing | |
1923 | * | |
1924 | * Notes: | |
1925 | */ | |
1926 | void scsi_free_host_dev(struct scsi_device *sdev) | |
1927 | { | |
1928 | BUG_ON(sdev->id != sdev->host->this_id); | |
1929 | ||
6f3a2024 | 1930 | scsi_destroy_sdev(sdev); |
1da177e4 LT |
1931 | } |
1932 | EXPORT_SYMBOL(scsi_free_host_dev); | |
1933 |