Branch data Line data Source code
1 : : // SPDX-License-Identifier: GPL-2.0
2 : : /*
3 : : * scsi_scan.c
4 : : *
5 : : * Copyright (C) 2000 Eric Youngdale,
6 : : * Copyright (C) 2002 Patrick Mansfield
7 : : *
8 : : * The general scanning/probing algorithm is as follows, exceptions are
9 : : * made to it depending on device specific flags, compilation options, and
10 : : * global variable (boot or module load time) settings.
11 : : *
12 : : * A specific LUN is scanned via an INQUIRY command; if the LUN has a
13 : : * device attached, a scsi_device is allocated and setup for it.
14 : : *
15 : : * For every id of every channel on the given host:
16 : : *
17 : : * Scan LUN 0; if the target responds to LUN 0 (even if there is no
18 : : * device or storage attached to LUN 0):
19 : : *
20 : : * If LUN 0 has a device attached, allocate and setup a
21 : : * scsi_device for it.
22 : : *
23 : : * If target is SCSI-3 or up, issue a REPORT LUN, and scan
24 : : * all of the LUNs returned by the REPORT LUN; else,
25 : : * sequentially scan LUNs up until some maximum is reached,
26 : : * or a LUN is seen that cannot have a device attached to it.
27 : : */
28 : :
29 : : #include <linux/module.h>
30 : : #include <linux/moduleparam.h>
31 : : #include <linux/init.h>
32 : : #include <linux/blkdev.h>
33 : : #include <linux/delay.h>
34 : : #include <linux/kthread.h>
35 : : #include <linux/spinlock.h>
36 : : #include <linux/async.h>
37 : : #include <linux/slab.h>
38 : : #include <asm/unaligned.h>
39 : :
40 : : #include <scsi/scsi.h>
41 : : #include <scsi/scsi_cmnd.h>
42 : : #include <scsi/scsi_device.h>
43 : : #include <scsi/scsi_driver.h>
44 : : #include <scsi/scsi_devinfo.h>
45 : : #include <scsi/scsi_host.h>
46 : : #include <scsi/scsi_transport.h>
47 : : #include <scsi/scsi_dh.h>
48 : : #include <scsi/scsi_eh.h>
49 : :
50 : : #include "scsi_priv.h"
51 : : #include "scsi_logging.h"
52 : :
53 : : #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
54 : : " SCSI scanning, some SCSI devices might not be configured\n"
55 : :
56 : : /*
57 : : * Default timeout
58 : : */
59 : : #define SCSI_TIMEOUT (2*HZ)
60 : : #define SCSI_REPORT_LUNS_TIMEOUT (30*HZ)
61 : :
62 : : /*
63 : : * Prefix values for the SCSI id's (stored in sysfs name field)
64 : : */
65 : : #define SCSI_UID_SER_NUM 'S'
66 : : #define SCSI_UID_UNKNOWN 'Z'
67 : :
68 : : /*
69 : : * Return values of some of the scanning functions.
70 : : *
71 : : * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
72 : : * includes allocation or general failures preventing IO from being sent.
73 : : *
74 : : * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
75 : : * on the given LUN.
76 : : *
77 : : * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
78 : : * given LUN.
79 : : */
80 : : #define SCSI_SCAN_NO_RESPONSE 0
81 : : #define SCSI_SCAN_TARGET_PRESENT 1
82 : : #define SCSI_SCAN_LUN_PRESENT 2
83 : :
84 : : static const char *scsi_null_device_strs = "nullnullnullnull";
85 : :
86 : : #define MAX_SCSI_LUNS 512
87 : :
88 : : static u64 max_scsi_luns = MAX_SCSI_LUNS;
89 : :
90 : : module_param_named(max_luns, max_scsi_luns, ullong, S_IRUGO|S_IWUSR);
91 : : MODULE_PARM_DESC(max_luns,
92 : : "last scsi LUN (should be between 1 and 2^64-1)");
93 : :
94 : : #ifdef CONFIG_SCSI_SCAN_ASYNC
95 : : #define SCSI_SCAN_TYPE_DEFAULT "async"
96 : : #else
97 : : #define SCSI_SCAN_TYPE_DEFAULT "sync"
98 : : #endif
99 : :
100 : : char scsi_scan_type[7] = SCSI_SCAN_TYPE_DEFAULT;
101 : :
102 : : module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type),
103 : : S_IRUGO|S_IWUSR);
104 : : MODULE_PARM_DESC(scan, "sync, async, manual, or none. "
105 : : "Setting to 'manual' disables automatic scanning, but allows "
106 : : "for manual device scan via the 'scan' sysfs attribute.");
107 : :
108 : : static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
109 : :
110 : : module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
111 : : MODULE_PARM_DESC(inq_timeout,
112 : : "Timeout (in seconds) waiting for devices to answer INQUIRY."
113 : : " Default is 20. Some devices may need more; most need less.");
114 : :
115 : : /* This lock protects only this list */
116 : : static DEFINE_SPINLOCK(async_scan_lock);
117 : : static LIST_HEAD(scanning_hosts);
118 : :
119 : : struct async_scan_data {
120 : : struct list_head list;
121 : : struct Scsi_Host *shost;
122 : : struct completion prev_finished;
123 : : };
124 : :
125 : : /**
126 : : * scsi_complete_async_scans - Wait for asynchronous scans to complete
127 : : *
128 : : * When this function returns, any host which started scanning before
129 : : * this function was called will have finished its scan. Hosts which
130 : : * started scanning after this function was called may or may not have
131 : : * finished.
132 : : */
133 : 0 : int scsi_complete_async_scans(void)
134 : : {
135 : : struct async_scan_data *data;
136 : :
137 : : do {
138 [ # # ]: 0 : if (list_empty(&scanning_hosts))
139 : : return 0;
140 : : /* If we can't get memory immediately, that's OK. Just
141 : : * sleep a little. Even if we never get memory, the async
142 : : * scans will finish eventually.
143 : : */
144 : : data = kmalloc(sizeof(*data), GFP_KERNEL);
145 [ # # ]: 0 : if (!data)
146 : 0 : msleep(1);
147 [ # # ]: 0 : } while (!data);
148 : :
149 : 0 : data->shost = NULL;
150 : : init_completion(&data->prev_finished);
151 : :
152 : : spin_lock(&async_scan_lock);
153 : : /* Check that there's still somebody else on the list */
154 [ # # ]: 0 : if (list_empty(&scanning_hosts))
155 : : goto done;
156 : 0 : list_add_tail(&data->list, &scanning_hosts);
157 : : spin_unlock(&async_scan_lock);
158 : :
159 : 0 : printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
160 : 0 : wait_for_completion(&data->prev_finished);
161 : :
162 : : spin_lock(&async_scan_lock);
163 : : list_del(&data->list);
164 [ # # ]: 0 : if (!list_empty(&scanning_hosts)) {
165 : 0 : struct async_scan_data *next = list_entry(scanning_hosts.next,
166 : : struct async_scan_data, list);
167 : 0 : complete(&next->prev_finished);
168 : : }
169 : : done:
170 : : spin_unlock(&async_scan_lock);
171 : :
172 : 0 : kfree(data);
173 : 0 : return 0;
174 : : }
175 : :
176 : : /**
177 : : * scsi_unlock_floptical - unlock device via a special MODE SENSE command
178 : : * @sdev: scsi device to send command to
179 : : * @result: area to store the result of the MODE SENSE
180 : : *
181 : : * Description:
182 : : * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
183 : : * Called for BLIST_KEY devices.
184 : : **/
185 : 0 : static void scsi_unlock_floptical(struct scsi_device *sdev,
186 : : unsigned char *result)
187 : : {
188 : : unsigned char scsi_cmd[MAX_COMMAND_SIZE];
189 : :
190 : 0 : sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n");
191 : 0 : scsi_cmd[0] = MODE_SENSE;
192 : 0 : scsi_cmd[1] = 0;
193 : 0 : scsi_cmd[2] = 0x2e;
194 : 0 : scsi_cmd[3] = 0;
195 : 0 : scsi_cmd[4] = 0x2a; /* size */
196 : 0 : scsi_cmd[5] = 0;
197 : : scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
198 : : SCSI_TIMEOUT, 3, NULL);
199 : 0 : }
200 : :
201 : : /**
202 : : * scsi_alloc_sdev - allocate and setup a scsi_Device
203 : : * @starget: which target to allocate a &scsi_device for
204 : : * @lun: which lun
205 : : * @hostdata: usually NULL and set by ->slave_alloc instead
206 : : *
207 : : * Description:
208 : : * Allocate, initialize for io, and return a pointer to a scsi_Device.
209 : : * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
210 : : * adds scsi_Device to the appropriate list.
211 : : *
212 : : * Return value:
213 : : * scsi_Device pointer, or NULL on failure.
214 : : **/
215 : 0 : static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
216 : : u64 lun, void *hostdata)
217 : : {
218 : : struct scsi_device *sdev;
219 : : int display_failure_msg = 1, ret;
220 : 0 : struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
221 : :
222 : 0 : sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
223 : : GFP_KERNEL);
224 [ # # ]: 0 : if (!sdev)
225 : : goto out;
226 : :
227 : 0 : sdev->vendor = scsi_null_device_strs;
228 : 0 : sdev->model = scsi_null_device_strs;
229 : 0 : sdev->rev = scsi_null_device_strs;
230 : 0 : sdev->host = shost;
231 : 0 : sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
232 : 0 : sdev->id = starget->id;
233 : 0 : sdev->lun = lun;
234 : 0 : sdev->channel = starget->channel;
235 : 0 : mutex_init(&sdev->state_mutex);
236 : 0 : sdev->sdev_state = SDEV_CREATED;
237 : 0 : INIT_LIST_HEAD(&sdev->siblings);
238 : 0 : INIT_LIST_HEAD(&sdev->same_target_siblings);
239 : 0 : INIT_LIST_HEAD(&sdev->cmd_list);
240 : 0 : INIT_LIST_HEAD(&sdev->starved_entry);
241 : 0 : INIT_LIST_HEAD(&sdev->event_list);
242 : 0 : spin_lock_init(&sdev->list_lock);
243 : 0 : mutex_init(&sdev->inquiry_mutex);
244 : 0 : INIT_WORK(&sdev->event_work, scsi_evt_thread);
245 : 0 : INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
246 : :
247 : 0 : sdev->sdev_gendev.parent = get_device(&starget->dev);
248 : 0 : sdev->sdev_target = starget;
249 : :
250 : : /* usually NULL and set by ->slave_alloc instead */
251 : 0 : sdev->hostdata = hostdata;
252 : :
253 : : /* if the device needs this changing, it may do so in the
254 : : * slave_configure function */
255 : 0 : sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
256 : :
257 : : /*
258 : : * Some low level driver could use device->type
259 : : */
260 : 0 : sdev->type = -1;
261 : :
262 : : /*
263 : : * Assume that the device will have handshaking problems,
264 : : * and then fix this field later if it turns out it
265 : : * doesn't
266 : : */
267 : 0 : sdev->borken = 1;
268 : :
269 : 0 : sdev->request_queue = scsi_mq_alloc_queue(sdev);
270 [ # # ]: 0 : if (!sdev->request_queue) {
271 : : /* release fn is set up in scsi_sysfs_device_initialise, so
272 : : * have to free and put manually here */
273 : 0 : put_device(&starget->dev);
274 : 0 : kfree(sdev);
275 : 0 : goto out;
276 : : }
277 [ # # # # ]: 0 : WARN_ON_ONCE(!blk_get_queue(sdev->request_queue));
278 : 0 : sdev->request_queue->queuedata = sdev;
279 : :
280 [ # # ]: 0 : scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun ?
281 : : sdev->host->cmd_per_lun : 1);
282 : :
283 : 0 : scsi_sysfs_device_initialize(sdev);
284 : :
285 [ # # ]: 0 : if (shost->hostt->slave_alloc) {
286 : 0 : ret = shost->hostt->slave_alloc(sdev);
287 [ # # ]: 0 : if (ret) {
288 : : /*
289 : : * if LLDD reports slave not present, don't clutter
290 : : * console with alloc failure messages
291 : : */
292 [ # # ]: 0 : if (ret == -ENXIO)
293 : : display_failure_msg = 0;
294 : : goto out_device_destroy;
295 : : }
296 : : }
297 : :
298 : 0 : return sdev;
299 : :
300 : : out_device_destroy:
301 : 0 : __scsi_remove_device(sdev);
302 : : out:
303 [ # # ]: 0 : if (display_failure_msg)
304 : 0 : printk(ALLOC_FAILURE_MSG, __func__);
305 : : return NULL;
306 : : }
307 : :
308 : 0 : static void scsi_target_destroy(struct scsi_target *starget)
309 : : {
310 : 0 : struct device *dev = &starget->dev;
311 : 0 : struct Scsi_Host *shost = dev_to_shost(dev->parent);
312 : : unsigned long flags;
313 : :
314 [ # # ]: 0 : BUG_ON(starget->state == STARGET_DEL);
315 : 0 : starget->state = STARGET_DEL;
316 : 0 : transport_destroy_device(dev);
317 : 0 : spin_lock_irqsave(shost->host_lock, flags);
318 [ # # ]: 0 : if (shost->hostt->target_destroy)
319 : 0 : shost->hostt->target_destroy(starget);
320 : 0 : list_del_init(&starget->siblings);
321 : 0 : spin_unlock_irqrestore(shost->host_lock, flags);
322 : 0 : put_device(dev);
323 : 0 : }
324 : :
325 : 0 : static void scsi_target_dev_release(struct device *dev)
326 : : {
327 : 0 : struct device *parent = dev->parent;
328 : 0 : struct scsi_target *starget = to_scsi_target(dev);
329 : :
330 : 0 : kfree(starget);
331 : 0 : put_device(parent);
332 : 0 : }
333 : :
334 : : static struct device_type scsi_target_type = {
335 : : .name = "scsi_target",
336 : : .release = scsi_target_dev_release,
337 : : };
338 : :
339 : 0 : int scsi_is_target_device(const struct device *dev)
340 : : {
341 : 0 : return dev->type == &scsi_target_type;
342 : : }
343 : : EXPORT_SYMBOL(scsi_is_target_device);
344 : :
345 : 0 : static struct scsi_target *__scsi_find_target(struct device *parent,
346 : : int channel, uint id)
347 : : {
348 : : struct scsi_target *starget, *found_starget = NULL;
349 : 0 : struct Scsi_Host *shost = dev_to_shost(parent);
350 : : /*
351 : : * Search for an existing target for this sdev.
352 : : */
353 [ # # ]: 0 : list_for_each_entry(starget, &shost->__targets, siblings) {
354 [ # # # # ]: 0 : if (starget->id == id &&
355 : 0 : starget->channel == channel) {
356 : 0 : found_starget = starget;
357 : 0 : break;
358 : : }
359 : : }
360 [ # # ]: 0 : if (found_starget)
361 : 0 : get_device(&found_starget->dev);
362 : :
363 : 0 : return found_starget;
364 : : }
365 : :
366 : : /**
367 : : * scsi_target_reap_ref_release - remove target from visibility
368 : : * @kref: the reap_ref in the target being released
369 : : *
370 : : * Called on last put of reap_ref, which is the indication that no device
371 : : * under this target is visible anymore, so render the target invisible in
372 : : * sysfs. Note: we have to be in user context here because the target reaps
373 : : * should be done in places where the scsi device visibility is being removed.
374 : : */
375 : 0 : static void scsi_target_reap_ref_release(struct kref *kref)
376 : : {
377 : : struct scsi_target *starget
378 : 0 : = container_of(kref, struct scsi_target, reap_ref);
379 : :
380 : : /*
381 : : * if we get here and the target is still in a CREATED state that
382 : : * means it was allocated but never made visible (because a scan
383 : : * turned up no LUNs), so don't call device_del() on it.
384 : : */
385 [ # # ]: 0 : if ((starget->state != STARGET_CREATED) &&
386 : : (starget->state != STARGET_CREATED_REMOVE)) {
387 : 0 : transport_remove_device(&starget->dev);
388 : 0 : device_del(&starget->dev);
389 : : }
390 : 0 : scsi_target_destroy(starget);
391 : 0 : }
392 : :
393 : : static void scsi_target_reap_ref_put(struct scsi_target *starget)
394 : : {
395 : 0 : kref_put(&starget->reap_ref, scsi_target_reap_ref_release);
396 : : }
397 : :
398 : : /**
399 : : * scsi_alloc_target - allocate a new or find an existing target
400 : : * @parent: parent of the target (need not be a scsi host)
401 : : * @channel: target channel number (zero if no channels)
402 : : * @id: target id number
403 : : *
404 : : * Return an existing target if one exists, provided it hasn't already
405 : : * gone into STARGET_DEL state, otherwise allocate a new target.
406 : : *
407 : : * The target is returned with an incremented reference, so the caller
408 : : * is responsible for both reaping and doing a last put
409 : : */
410 : 0 : static struct scsi_target *scsi_alloc_target(struct device *parent,
411 : : int channel, uint id)
412 : : {
413 : 0 : struct Scsi_Host *shost = dev_to_shost(parent);
414 : : struct device *dev = NULL;
415 : : unsigned long flags;
416 : : const int size = sizeof(struct scsi_target)
417 : 0 : + shost->transportt->target_size;
418 : : struct scsi_target *starget;
419 : : struct scsi_target *found_target;
420 : : int error, ref_got;
421 : :
422 : 0 : starget = kzalloc(size, GFP_KERNEL);
423 [ # # ]: 0 : if (!starget) {
424 : 0 : printk(KERN_ERR "%s: allocation failure\n", __func__);
425 : 0 : return NULL;
426 : : }
427 : 0 : dev = &starget->dev;
428 : 0 : device_initialize(dev);
429 : : kref_init(&starget->reap_ref);
430 : 0 : dev->parent = get_device(parent);
431 : 0 : dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
432 : 0 : dev->bus = &scsi_bus_type;
433 : 0 : dev->type = &scsi_target_type;
434 : 0 : starget->id = id;
435 : 0 : starget->channel = channel;
436 : 0 : starget->can_queue = 0;
437 : 0 : INIT_LIST_HEAD(&starget->siblings);
438 : 0 : INIT_LIST_HEAD(&starget->devices);
439 : 0 : starget->state = STARGET_CREATED;
440 : 0 : starget->scsi_level = SCSI_2;
441 : 0 : starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
442 : : retry:
443 : 0 : spin_lock_irqsave(shost->host_lock, flags);
444 : :
445 : 0 : found_target = __scsi_find_target(parent, channel, id);
446 [ # # ]: 0 : if (found_target)
447 : : goto found;
448 : :
449 : 0 : list_add_tail(&starget->siblings, &shost->__targets);
450 : 0 : spin_unlock_irqrestore(shost->host_lock, flags);
451 : : /* allocate and add */
452 : 0 : transport_setup_device(dev);
453 [ # # ]: 0 : if (shost->hostt->target_alloc) {
454 : 0 : error = shost->hostt->target_alloc(starget);
455 : :
456 [ # # ]: 0 : if(error) {
457 : 0 : dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
458 : : /* don't want scsi_target_reap to do the final
459 : : * put because it will be under the host lock */
460 : 0 : scsi_target_destroy(starget);
461 : 0 : return NULL;
462 : : }
463 : : }
464 : 0 : get_device(dev);
465 : :
466 : 0 : return starget;
467 : :
468 : : found:
469 : : /*
470 : : * release routine already fired if kref is zero, so if we can still
471 : : * take the reference, the target must be alive. If we can't, it must
472 : : * be dying and we need to wait for a new target
473 : : */
474 : : ref_got = kref_get_unless_zero(&found_target->reap_ref);
475 : :
476 : 0 : spin_unlock_irqrestore(shost->host_lock, flags);
477 [ # # ]: 0 : if (ref_got) {
478 : 0 : put_device(dev);
479 : 0 : return found_target;
480 : : }
481 : : /*
482 : : * Unfortunately, we found a dying target; need to wait until it's
483 : : * dead before we can get a new one. There is an anomaly here. We
484 : : * *should* call scsi_target_reap() to balance the kref_get() of the
485 : : * reap_ref above. However, since the target being released, it's
486 : : * already invisible and the reap_ref is irrelevant. If we call
487 : : * scsi_target_reap() we might spuriously do another device_del() on
488 : : * an already invisible target.
489 : : */
490 : 0 : put_device(&found_target->dev);
491 : : /*
492 : : * length of time is irrelevant here, we just want to yield the CPU
493 : : * for a tick to avoid busy waiting for the target to die.
494 : : */
495 : 0 : msleep(1);
496 : 0 : goto retry;
497 : : }
498 : :
499 : : /**
500 : : * scsi_target_reap - check to see if target is in use and destroy if not
501 : : * @starget: target to be checked
502 : : *
503 : : * This is used after removing a LUN or doing a last put of the target
504 : : * it checks atomically that nothing is using the target and removes
505 : : * it if so.
506 : : */
507 : 0 : void scsi_target_reap(struct scsi_target *starget)
508 : : {
509 : : /*
510 : : * serious problem if this triggers: STARGET_DEL is only set in the if
511 : : * the reap_ref drops to zero, so we're trying to do another final put
512 : : * on an already released kref
513 : : */
514 [ # # ]: 0 : BUG_ON(starget->state == STARGET_DEL);
515 : : scsi_target_reap_ref_put(starget);
516 : 0 : }
517 : :
518 : : /**
519 : : * scsi_sanitize_inquiry_string - remove non-graphical chars from an
520 : : * INQUIRY result string
521 : : * @s: INQUIRY result string to sanitize
522 : : * @len: length of the string
523 : : *
524 : : * Description:
525 : : * The SCSI spec says that INQUIRY vendor, product, and revision
526 : : * strings must consist entirely of graphic ASCII characters,
527 : : * padded on the right with spaces. Since not all devices obey
528 : : * this rule, we will replace non-graphic or non-ASCII characters
529 : : * with spaces. Exception: a NUL character is interpreted as a
530 : : * string terminator, so all the following characters are set to
531 : : * spaces.
532 : : **/
533 : 0 : void scsi_sanitize_inquiry_string(unsigned char *s, int len)
534 : : {
535 : : int terminated = 0;
536 : :
537 [ # # # # : 0 : for (; len > 0; (--len, ++s)) {
# # # # ]
538 [ # # # # : 0 : if (*s == 0)
# # # # ]
539 : : terminated = 1;
540 [ # # # # : 0 : if (terminated || *s < 0x20 || *s > 0x7e)
# # # # #
# # # # #
# # # # #
# # # #
# ]
541 : 0 : *s = ' ';
542 : : }
543 : 0 : }
544 : : EXPORT_SYMBOL(scsi_sanitize_inquiry_string);
545 : :
546 : : /**
547 : : * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
548 : : * @sdev: scsi_device to probe
549 : : * @inq_result: area to store the INQUIRY result
550 : : * @result_len: len of inq_result
551 : : * @bflags: store any bflags found here
552 : : *
553 : : * Description:
554 : : * Probe the lun associated with @req using a standard SCSI INQUIRY;
555 : : *
556 : : * If the INQUIRY is successful, zero is returned and the
557 : : * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
558 : : * are copied to the scsi_device any flags value is stored in *@bflags.
559 : : **/
560 : 0 : static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
561 : : int result_len, blist_flags_t *bflags)
562 : : {
563 : : unsigned char scsi_cmd[MAX_COMMAND_SIZE];
564 : : int first_inquiry_len, try_inquiry_len, next_inquiry_len;
565 : : int response_len = 0;
566 : : int pass, count, result;
567 : : struct scsi_sense_hdr sshdr;
568 : :
569 : 0 : *bflags = 0;
570 : :
571 : : /* Perform up to 3 passes. The first pass uses a conservative
572 : : * transfer length of 36 unless sdev->inquiry_len specifies a
573 : : * different value. */
574 [ # # ]: 0 : first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
575 : : try_inquiry_len = first_inquiry_len;
576 : : pass = 1;
577 : :
578 : : next_pass:
579 : : SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
580 : : "scsi scan: INQUIRY pass %d length %d\n",
581 : : pass, try_inquiry_len));
582 : :
583 : : /* Each pass gets up to three chances to ignore Unit Attention */
584 [ # # ]: 0 : for (count = 0; count < 3; ++count) {
585 : : int resid;
586 : :
587 : 0 : memset(scsi_cmd, 0, 6);
588 : 0 : scsi_cmd[0] = INQUIRY;
589 : 0 : scsi_cmd[4] = (unsigned char) try_inquiry_len;
590 : :
591 : 0 : memset(inq_result, 0, try_inquiry_len);
592 : :
593 : 0 : result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
594 : : inq_result, try_inquiry_len, &sshdr,
595 : 0 : HZ / 2 + HZ * scsi_inq_timeout, 3,
596 : : &resid);
597 : :
598 : : SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
599 : : "scsi scan: INQUIRY %s with code 0x%x\n",
600 : : result ? "failed" : "successful", result));
601 : :
602 [ # # ]: 0 : if (result) {
603 : : /*
604 : : * not-ready to ready transition [asc/ascq=0x28/0x0]
605 : : * or power-on, reset [asc/ascq=0x29/0x0], continue.
606 : : * INQUIRY should not yield UNIT_ATTENTION
607 : : * but many buggy devices do so anyway.
608 : : */
609 [ # # # # ]: 0 : if (driver_byte(result) == DRIVER_SENSE &&
610 : : scsi_sense_valid(&sshdr)) {
611 [ # # # # ]: 0 : if ((sshdr.sense_key == UNIT_ATTENTION) &&
612 : 0 : ((sshdr.asc == 0x28) ||
613 [ # # ]: 0 : (sshdr.asc == 0x29)) &&
614 : 0 : (sshdr.ascq == 0))
615 : 0 : continue;
616 : : }
617 : : } else {
618 : : /*
619 : : * if nothing was transferred, we try
620 : : * again. It's a workaround for some USB
621 : : * devices.
622 : : */
623 [ # # ]: 0 : if (resid == try_inquiry_len)
624 : 0 : continue;
625 : : }
626 : 0 : break;
627 : : }
628 : :
629 [ # # ]: 0 : if (result == 0) {
630 : 0 : scsi_sanitize_inquiry_string(&inq_result[8], 8);
631 : 0 : scsi_sanitize_inquiry_string(&inq_result[16], 16);
632 : 0 : scsi_sanitize_inquiry_string(&inq_result[32], 4);
633 : :
634 : 0 : response_len = inq_result[4] + 5;
635 [ # # ]: 0 : if (response_len > 255)
636 : : response_len = first_inquiry_len; /* sanity */
637 : :
638 : : /*
639 : : * Get any flags for this device.
640 : : *
641 : : * XXX add a bflags to scsi_device, and replace the
642 : : * corresponding bit fields in scsi_device, so bflags
643 : : * need not be passed as an argument.
644 : : */
645 : 0 : *bflags = scsi_get_device_flags(sdev, &inq_result[8],
646 : : &inq_result[16]);
647 : :
648 : : /* When the first pass succeeds we gain information about
649 : : * what larger transfer lengths might work. */
650 [ # # ]: 0 : if (pass == 1) {
651 [ # # ]: 0 : if (BLIST_INQUIRY_36 & *bflags)
652 : : next_inquiry_len = 36;
653 [ # # ]: 0 : else if (sdev->inquiry_len)
654 : 0 : next_inquiry_len = sdev->inquiry_len;
655 : : else
656 : : next_inquiry_len = response_len;
657 : :
658 : : /* If more data is available perform the second pass */
659 [ # # ]: 0 : if (next_inquiry_len > try_inquiry_len) {
660 : : try_inquiry_len = next_inquiry_len;
661 : : pass = 2;
662 : : goto next_pass;
663 : : }
664 : : }
665 : :
666 [ # # ]: 0 : } else if (pass == 2) {
667 : 0 : sdev_printk(KERN_INFO, sdev,
668 : : "scsi scan: %d byte inquiry failed. "
669 : : "Consider BLIST_INQUIRY_36 for this device\n",
670 : : try_inquiry_len);
671 : :
672 : : /* If this pass failed, the third pass goes back and transfers
673 : : * the same amount as we successfully got in the first pass. */
674 : : try_inquiry_len = first_inquiry_len;
675 : : pass = 3;
676 : 0 : goto next_pass;
677 : : }
678 : :
679 : : /* If the last transfer attempt got an error, assume the
680 : : * peripheral doesn't exist or is dead. */
681 [ # # ]: 0 : if (result)
682 : : return -EIO;
683 : :
684 : : /* Don't report any more data than the device says is valid */
685 : 0 : sdev->inquiry_len = min(try_inquiry_len, response_len);
686 : :
687 : : /*
688 : : * XXX Abort if the response length is less than 36? If less than
689 : : * 32, the lookup of the device flags (above) could be invalid,
690 : : * and it would be possible to take an incorrect action - we do
691 : : * not want to hang because of a short INQUIRY. On the flip side,
692 : : * if the device is spun down or becoming ready (and so it gives a
693 : : * short INQUIRY), an abort here prevents any further use of the
694 : : * device, including spin up.
695 : : *
696 : : * On the whole, the best approach seems to be to assume the first
697 : : * 36 bytes are valid no matter what the device says. That's
698 : : * better than copying < 36 bytes to the inquiry-result buffer
699 : : * and displaying garbage for the Vendor, Product, or Revision
700 : : * strings.
701 : : */
702 [ # # ]: 0 : if (sdev->inquiry_len < 36) {
703 [ # # ]: 0 : if (!sdev->host->short_inquiry) {
704 : 0 : shost_printk(KERN_INFO, sdev->host,
705 : : "scsi scan: INQUIRY result too short (%d),"
706 : : " using 36\n", sdev->inquiry_len);
707 : 0 : sdev->host->short_inquiry = 1;
708 : : }
709 : 0 : sdev->inquiry_len = 36;
710 : : }
711 : :
712 : : /*
713 : : * Related to the above issue:
714 : : *
715 : : * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
716 : : * and if not ready, sent a START_STOP to start (maybe spin up) and
717 : : * then send the INQUIRY again, since the INQUIRY can change after
718 : : * a device is initialized.
719 : : *
720 : : * Ideally, start a device if explicitly asked to do so. This
721 : : * assumes that a device is spun up on power on, spun down on
722 : : * request, and then spun up on request.
723 : : */
724 : :
725 : : /*
726 : : * The scanning code needs to know the scsi_level, even if no
727 : : * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
728 : : * non-zero LUNs can be scanned.
729 : : */
730 : 0 : sdev->scsi_level = inq_result[2] & 0x07;
731 [ # # # # ]: 0 : if (sdev->scsi_level >= 2 ||
732 [ # # ]: 0 : (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
733 : 0 : sdev->scsi_level++;
734 : 0 : sdev->sdev_target->scsi_level = sdev->scsi_level;
735 : :
736 : : /*
737 : : * If SCSI-2 or lower, and if the transport requires it,
738 : : * store the LUN value in CDB[1].
739 : : */
740 : 0 : sdev->lun_in_cdb = 0;
741 [ # # ]: 0 : if (sdev->scsi_level <= SCSI_2 &&
742 [ # # ]: 0 : sdev->scsi_level != SCSI_UNKNOWN &&
743 : 0 : !sdev->host->no_scsi2_lun_in_cdb)
744 : 0 : sdev->lun_in_cdb = 1;
745 : :
746 : : return 0;
747 : : }
748 : :
749 : : /**
750 : : * scsi_add_lun - allocate and fully initialze a scsi_device
751 : : * @sdev: holds information to be stored in the new scsi_device
752 : : * @inq_result: holds the result of a previous INQUIRY to the LUN
753 : : * @bflags: black/white list flag
754 : : * @async: 1 if this device is being scanned asynchronously
755 : : *
756 : : * Description:
757 : : * Initialize the scsi_device @sdev. Optionally set fields based
758 : : * on values in *@bflags.
759 : : *
760 : : * Return:
761 : : * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
762 : : * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
763 : : **/
764 : 0 : static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
765 : : blist_flags_t *bflags, int async)
766 : : {
767 : : int ret;
768 : :
769 : : /*
770 : : * XXX do not save the inquiry, since it can change underneath us,
771 : : * save just vendor/model/rev.
772 : : *
773 : : * Rather than save it and have an ioctl that retrieves the saved
774 : : * value, have an ioctl that executes the same INQUIRY code used
775 : : * in scsi_probe_lun, let user level programs doing INQUIRY
776 : : * scanning run at their own risk, or supply a user level program
777 : : * that can correctly scan.
778 : : */
779 : :
780 : : /*
781 : : * Copy at least 36 bytes of INQUIRY data, so that we don't
782 : : * dereference unallocated memory when accessing the Vendor,
783 : : * Product, and Revision strings. Badly behaved devices may set
784 : : * the INQUIRY Additional Length byte to a small value, indicating
785 : : * these strings are invalid, but often they contain plausible data
786 : : * nonetheless. It doesn't matter if the device sent < 36 bytes
787 : : * total, since scsi_probe_lun() initializes inq_result with 0s.
788 : : */
789 : 0 : sdev->inquiry = kmemdup(inq_result,
790 : 0 : max_t(size_t, sdev->inquiry_len, 36),
791 : : GFP_KERNEL);
792 [ # # ]: 0 : if (sdev->inquiry == NULL)
793 : : return SCSI_SCAN_NO_RESPONSE;
794 : :
795 : 0 : sdev->vendor = (char *) (sdev->inquiry + 8);
796 : 0 : sdev->model = (char *) (sdev->inquiry + 16);
797 : 0 : sdev->rev = (char *) (sdev->inquiry + 32);
798 : :
799 [ # # ]: 0 : if (strncmp(sdev->vendor, "ATA ", 8) == 0) {
800 : : /*
801 : : * sata emulation layer device. This is a hack to work around
802 : : * the SATL power management specifications which state that
803 : : * when the SATL detects the device has gone into standby
804 : : * mode, it shall respond with NOT READY.
805 : : */
806 : 0 : sdev->allow_restart = 1;
807 : : }
808 : :
809 [ # # ]: 0 : if (*bflags & BLIST_ISROM) {
810 : 0 : sdev->type = TYPE_ROM;
811 : 0 : sdev->removable = 1;
812 : : } else {
813 : 0 : sdev->type = (inq_result[0] & 0x1f);
814 : 0 : sdev->removable = (inq_result[1] & 0x80) >> 7;
815 : :
816 : : /*
817 : : * some devices may respond with wrong type for
818 : : * well-known logical units. Force well-known type
819 : : * to enumerate them correctly.
820 : : */
821 [ # # # # ]: 0 : if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
822 : 0 : sdev_printk(KERN_WARNING, sdev,
823 : : "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n",
824 : : __func__, sdev->type, (unsigned int)sdev->lun);
825 : 0 : sdev->type = TYPE_WLUN;
826 : : }
827 : :
828 : : }
829 : :
830 [ # # ]: 0 : if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
831 : : /* RBC and MMC devices can return SCSI-3 compliance and yet
832 : : * still not support REPORT LUNS, so make them act as
833 : : * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
834 : : * specifically set */
835 [ # # ]: 0 : if ((*bflags & BLIST_REPORTLUN2) == 0)
836 : 0 : *bflags |= BLIST_NOREPORTLUN;
837 : : }
838 : :
839 : : /*
840 : : * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
841 : : * spec says: The device server is capable of supporting the
842 : : * specified peripheral device type on this logical unit. However,
843 : : * the physical device is not currently connected to this logical
844 : : * unit.
845 : : *
846 : : * The above is vague, as it implies that we could treat 001 and
847 : : * 011 the same. Stay compatible with previous code, and create a
848 : : * scsi_device for a PQ of 1
849 : : *
850 : : * Don't set the device offline here; rather let the upper
851 : : * level drivers eval the PQ to decide whether they should
852 : : * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
853 : : */
854 : :
855 : 0 : sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
856 : 0 : sdev->lockable = sdev->removable;
857 [ # # # # ]: 0 : sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
858 : :
859 [ # # # # ]: 0 : if (sdev->scsi_level >= SCSI_3 ||
860 [ # # ]: 0 : (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
861 : 0 : sdev->ppr = 1;
862 [ # # ]: 0 : if (inq_result[7] & 0x60)
863 : 0 : sdev->wdtr = 1;
864 [ # # ]: 0 : if (inq_result[7] & 0x10)
865 : 0 : sdev->sdtr = 1;
866 : :
867 [ # # ]: 0 : sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
868 : : "ANSI: %d%s\n", scsi_device_type(sdev->type),
869 : : sdev->vendor, sdev->model, sdev->rev,
870 : : sdev->inq_periph_qual, inq_result[2] & 0x07,
871 : : (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
872 : :
873 [ # # # # : 0 : if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
# # ]
874 : 0 : !(*bflags & BLIST_NOTQ)) {
875 : 0 : sdev->tagged_supported = 1;
876 : 0 : sdev->simple_tags = 1;
877 : : }
878 : :
879 : : /*
880 : : * Some devices (Texel CD ROM drives) have handshaking problems
881 : : * when used with the Seagate controllers. borken is initialized
882 : : * to 1, and then set it to 0 here.
883 : : */
884 [ # # ]: 0 : if ((*bflags & BLIST_BORKEN) == 0)
885 : 0 : sdev->borken = 0;
886 : :
887 [ # # ]: 0 : if (*bflags & BLIST_NO_ULD_ATTACH)
888 : 0 : sdev->no_uld_attach = 1;
889 : :
890 : : /*
891 : : * Apparently some really broken devices (contrary to the SCSI
892 : : * standards) need to be selected without asserting ATN
893 : : */
894 [ # # ]: 0 : if (*bflags & BLIST_SELECT_NO_ATN)
895 : 0 : sdev->select_no_atn = 1;
896 : :
897 : : /*
898 : : * Maximum 512 sector transfer length
899 : : * broken RA4x00 Compaq Disk Array
900 : : */
901 [ # # ]: 0 : if (*bflags & BLIST_MAX_512)
902 : 0 : blk_queue_max_hw_sectors(sdev->request_queue, 512);
903 : : /*
904 : : * Max 1024 sector transfer length for targets that report incorrect
905 : : * max/optimal lengths and relied on the old block layer safe default
906 : : */
907 [ # # ]: 0 : else if (*bflags & BLIST_MAX_1024)
908 : 0 : blk_queue_max_hw_sectors(sdev->request_queue, 1024);
909 : :
910 : : /*
911 : : * Some devices may not want to have a start command automatically
912 : : * issued when a device is added.
913 : : */
914 [ # # ]: 0 : if (*bflags & BLIST_NOSTARTONADD)
915 : 0 : sdev->no_start_on_add = 1;
916 : :
917 [ # # ]: 0 : if (*bflags & BLIST_SINGLELUN)
918 : 0 : scsi_target(sdev)->single_lun = 1;
919 : :
920 : 0 : sdev->use_10_for_rw = 1;
921 : :
922 : : /* some devices don't like REPORT SUPPORTED OPERATION CODES
923 : : * and will simply timeout causing sd_mod init to take a very
924 : : * very long time */
925 [ # # ]: 0 : if (*bflags & BLIST_NO_RSOC)
926 : 0 : sdev->no_report_opcodes = 1;
927 : :
928 : : /* set the device running here so that slave configure
929 : : * may do I/O */
930 : 0 : mutex_lock(&sdev->state_mutex);
931 : 0 : ret = scsi_device_set_state(sdev, SDEV_RUNNING);
932 [ # # ]: 0 : if (ret)
933 : 0 : ret = scsi_device_set_state(sdev, SDEV_BLOCK);
934 : 0 : mutex_unlock(&sdev->state_mutex);
935 : :
936 [ # # ]: 0 : if (ret) {
937 : 0 : sdev_printk(KERN_ERR, sdev,
938 : : "in wrong state %s to complete scan\n",
939 : : scsi_device_state_name(sdev->sdev_state));
940 : 0 : return SCSI_SCAN_NO_RESPONSE;
941 : : }
942 : :
943 [ # # ]: 0 : if (*bflags & BLIST_NOT_LOCKABLE)
944 : 0 : sdev->lockable = 0;
945 : :
946 [ # # ]: 0 : if (*bflags & BLIST_RETRY_HWERROR)
947 : 0 : sdev->retry_hwerror = 1;
948 : :
949 [ # # ]: 0 : if (*bflags & BLIST_NO_DIF)
950 : 0 : sdev->no_dif = 1;
951 : :
952 [ # # ]: 0 : if (*bflags & BLIST_UNMAP_LIMIT_WS)
953 : 0 : sdev->unmap_limit_for_ws = 1;
954 : :
955 : 0 : sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT;
956 : :
957 [ # # ]: 0 : if (*bflags & BLIST_TRY_VPD_PAGES)
958 : 0 : sdev->try_vpd_pages = 1;
959 [ # # ]: 0 : else if (*bflags & BLIST_SKIP_VPD_PAGES)
960 : 0 : sdev->skip_vpd_pages = 1;
961 : :
962 : 0 : transport_configure_device(&sdev->sdev_gendev);
963 : :
964 [ # # ]: 0 : if (sdev->host->hostt->slave_configure) {
965 : 0 : ret = sdev->host->hostt->slave_configure(sdev);
966 [ # # ]: 0 : if (ret) {
967 : : /*
968 : : * if LLDD reports slave not present, don't clutter
969 : : * console with alloc failure messages
970 : : */
971 [ # # ]: 0 : if (ret != -ENXIO) {
972 : 0 : sdev_printk(KERN_ERR, sdev,
973 : : "failed to configure device\n");
974 : : }
975 : : return SCSI_SCAN_NO_RESPONSE;
976 : : }
977 : : }
978 : :
979 [ # # ]: 0 : if (sdev->scsi_level >= SCSI_3)
980 : 0 : scsi_attach_vpd(sdev);
981 : :
982 : 0 : sdev->max_queue_depth = sdev->queue_depth;
983 : 0 : sdev->sdev_bflags = *bflags;
984 : :
985 : : /*
986 : : * Ok, the device is now all set up, we can
987 : : * register it and tell the rest of the kernel
988 : : * about it.
989 : : */
990 [ # # # # ]: 0 : if (!async && scsi_sysfs_add_sdev(sdev) != 0)
991 : : return SCSI_SCAN_NO_RESPONSE;
992 : :
993 : : return SCSI_SCAN_LUN_PRESENT;
994 : : }
995 : :
996 : : #ifdef CONFIG_SCSI_LOGGING
997 : : /**
998 : : * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
999 : : * @buf: Output buffer with at least end-first+1 bytes of space
1000 : : * @inq: Inquiry buffer (input)
1001 : : * @first: Offset of string into inq
1002 : : * @end: Index after last character in inq
1003 : : */
1004 : : static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
1005 : : unsigned first, unsigned end)
1006 : : {
1007 : : unsigned term = 0, idx;
1008 : :
1009 : : for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
1010 : : if (inq[idx+first] > ' ') {
1011 : : buf[idx] = inq[idx+first];
1012 : : term = idx+1;
1013 : : } else {
1014 : : buf[idx] = ' ';
1015 : : }
1016 : : }
1017 : : buf[term] = 0;
1018 : : return buf;
1019 : : }
1020 : : #endif
1021 : :
1022 : : /**
1023 : : * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1024 : : * @starget: pointer to target device structure
1025 : : * @lun: LUN of target device
1026 : : * @bflagsp: store bflags here if not NULL
1027 : : * @sdevp: probe the LUN corresponding to this scsi_device
1028 : : * @rescan: if not equal to SCSI_SCAN_INITIAL skip some code only
1029 : : * needed on first scan
1030 : : * @hostdata: passed to scsi_alloc_sdev()
1031 : : *
1032 : : * Description:
1033 : : * Call scsi_probe_lun, if a LUN with an attached device is found,
1034 : : * allocate and set it up by calling scsi_add_lun.
1035 : : *
1036 : : * Return:
1037 : : *
1038 : : * - SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
1039 : : * - SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1040 : : * attached at the LUN
1041 : : * - SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
1042 : : **/
1043 : 0 : static int scsi_probe_and_add_lun(struct scsi_target *starget,
1044 : : u64 lun, blist_flags_t *bflagsp,
1045 : : struct scsi_device **sdevp,
1046 : : enum scsi_scan_mode rescan,
1047 : : void *hostdata)
1048 : : {
1049 : : struct scsi_device *sdev;
1050 : : unsigned char *result;
1051 : : blist_flags_t bflags;
1052 : : int res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
1053 : 0 : struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1054 : :
1055 : : /*
1056 : : * The rescan flag is used as an optimization, the first scan of a
1057 : : * host adapter calls into here with rescan == 0.
1058 : : */
1059 : 0 : sdev = scsi_device_lookup_by_target(starget, lun);
1060 [ # # ]: 0 : if (sdev) {
1061 [ # # # # ]: 0 : if (rescan != SCSI_SCAN_INITIAL || !scsi_device_created(sdev)) {
1062 : : SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
1063 : : "scsi scan: device exists on %s\n",
1064 : : dev_name(&sdev->sdev_gendev)));
1065 [ # # ]: 0 : if (sdevp)
1066 : 0 : *sdevp = sdev;
1067 : : else
1068 : 0 : scsi_device_put(sdev);
1069 : :
1070 [ # # ]: 0 : if (bflagsp)
1071 : 0 : *bflagsp = scsi_get_device_flags(sdev,
1072 : 0 : sdev->vendor,
1073 : 0 : sdev->model);
1074 : : return SCSI_SCAN_LUN_PRESENT;
1075 : : }
1076 : 0 : scsi_device_put(sdev);
1077 : : } else
1078 : 0 : sdev = scsi_alloc_sdev(starget, lun, hostdata);
1079 [ # # ]: 0 : if (!sdev)
1080 : : goto out;
1081 : :
1082 [ # # ]: 0 : result = kmalloc(result_len, GFP_KERNEL |
1083 : 0 : ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
1084 [ # # ]: 0 : if (!result)
1085 : : goto out_free_sdev;
1086 : :
1087 [ # # ]: 0 : if (scsi_probe_lun(sdev, result, result_len, &bflags))
1088 : : goto out_free_result;
1089 : :
1090 [ # # ]: 0 : if (bflagsp)
1091 : 0 : *bflagsp = bflags;
1092 : : /*
1093 : : * result contains valid SCSI INQUIRY data.
1094 : : */
1095 [ # # ]: 0 : if ((result[0] >> 5) == 3) {
1096 : : /*
1097 : : * For a Peripheral qualifier 3 (011b), the SCSI
1098 : : * spec says: The device server is not capable of
1099 : : * supporting a physical device on this logical
1100 : : * unit.
1101 : : *
1102 : : * For disks, this implies that there is no
1103 : : * logical disk configured at sdev->lun, but there
1104 : : * is a target id responding.
1105 : : */
1106 : : SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1107 : : " peripheral qualifier of 3, device not"
1108 : : " added\n"))
1109 : : if (lun == 0) {
1110 : : SCSI_LOG_SCAN_BUS(1, {
1111 : : unsigned char vend[9];
1112 : : unsigned char mod[17];
1113 : :
1114 : : sdev_printk(KERN_INFO, sdev,
1115 : : "scsi scan: consider passing scsi_mod."
1116 : : "dev_flags=%s:%s:0x240 or 0x1000240\n",
1117 : : scsi_inq_str(vend, result, 8, 16),
1118 : : scsi_inq_str(mod, result, 16, 32));
1119 : : });
1120 : :
1121 : : }
1122 : :
1123 : : res = SCSI_SCAN_TARGET_PRESENT;
1124 : : goto out_free_result;
1125 : : }
1126 : :
1127 : : /*
1128 : : * Some targets may set slight variations of PQ and PDT to signal
1129 : : * that no LUN is present, so don't add sdev in these cases.
1130 : : * Two specific examples are:
1131 : : * 1) NetApp targets: return PQ=1, PDT=0x1f
1132 : : * 2) IBM/2145 targets: return PQ=1, PDT=0
1133 : : * 3) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1134 : : * in the UFI 1.0 spec (we cannot rely on reserved bits).
1135 : : *
1136 : : * References:
1137 : : * 1) SCSI SPC-3, pp. 145-146
1138 : : * PQ=1: "A peripheral device having the specified peripheral
1139 : : * device type is not connected to this logical unit. However, the
1140 : : * device server is capable of supporting the specified peripheral
1141 : : * device type on this logical unit."
1142 : : * PDT=0x1f: "Unknown or no device type"
1143 : : * 2) USB UFI 1.0, p. 20
1144 : : * PDT=00h Direct-access device (floppy)
1145 : : * PDT=1Fh none (no FDD connected to the requested logical unit)
1146 : : */
1147 [ # # # # ]: 0 : if (((result[0] >> 5) == 1 ||
1148 [ # # # # ]: 0 : (starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f)) &&
1149 : : !scsi_is_wlun(lun)) {
1150 : : SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
1151 : : "scsi scan: peripheral device type"
1152 : : " of 31, no device added\n"));
1153 : : res = SCSI_SCAN_TARGET_PRESENT;
1154 : : goto out_free_result;
1155 : : }
1156 : :
1157 : 0 : res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
1158 [ # # ]: 0 : if (res == SCSI_SCAN_LUN_PRESENT) {
1159 [ # # ]: 0 : if (bflags & BLIST_KEY) {
1160 : 0 : sdev->lockable = 0;
1161 : 0 : scsi_unlock_floptical(sdev, result);
1162 : : }
1163 : : }
1164 : :
1165 : : out_free_result:
1166 : 0 : kfree(result);
1167 : : out_free_sdev:
1168 [ # # ]: 0 : if (res == SCSI_SCAN_LUN_PRESENT) {
1169 [ # # ]: 0 : if (sdevp) {
1170 [ # # ]: 0 : if (scsi_device_get(sdev) == 0) {
1171 : 0 : *sdevp = sdev;
1172 : : } else {
1173 : 0 : __scsi_remove_device(sdev);
1174 : : res = SCSI_SCAN_NO_RESPONSE;
1175 : : }
1176 : : }
1177 : : } else
1178 : 0 : __scsi_remove_device(sdev);
1179 : : out:
1180 : 0 : return res;
1181 : : }
1182 : :
1183 : : /**
1184 : : * scsi_sequential_lun_scan - sequentially scan a SCSI target
1185 : : * @starget: pointer to target structure to scan
1186 : : * @bflags: black/white list flag for LUN 0
1187 : : * @scsi_level: Which version of the standard does this device adhere to
1188 : : * @rescan: passed to scsi_probe_add_lun()
1189 : : *
1190 : : * Description:
1191 : : * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1192 : : * scanned) to some maximum lun until a LUN is found with no device
1193 : : * attached. Use the bflags to figure out any oddities.
1194 : : *
1195 : : * Modifies sdevscan->lun.
1196 : : **/
1197 : 0 : static void scsi_sequential_lun_scan(struct scsi_target *starget,
1198 : : blist_flags_t bflags, int scsi_level,
1199 : : enum scsi_scan_mode rescan)
1200 : : {
1201 : : uint max_dev_lun;
1202 : : u64 sparse_lun, lun;
1203 : 0 : struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1204 : :
1205 : : SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget,
1206 : : "scsi scan: Sequential scan\n"));
1207 : :
1208 : 0 : max_dev_lun = min(max_scsi_luns, shost->max_lun);
1209 : : /*
1210 : : * If this device is known to support sparse multiple units,
1211 : : * override the other settings, and scan all of them. Normally,
1212 : : * SCSI-3 devices should be scanned via the REPORT LUNS.
1213 : : */
1214 [ # # ]: 0 : if (bflags & BLIST_SPARSELUN) {
1215 : 0 : max_dev_lun = shost->max_lun;
1216 : : sparse_lun = 1;
1217 : : } else
1218 : : sparse_lun = 0;
1219 : :
1220 : : /*
1221 : : * If less than SCSI_1_CCS, and no special lun scanning, stop
1222 : : * scanning; this matches 2.4 behaviour, but could just be a bug
1223 : : * (to continue scanning a SCSI_1_CCS device).
1224 : : *
1225 : : * This test is broken. We might not have any device on lun0 for
1226 : : * a sparselun device, and if that's the case then how would we
1227 : : * know the real scsi_level, eh? It might make sense to just not
1228 : : * scan any SCSI_1 device for non-0 luns, but that check would best
1229 : : * go into scsi_alloc_sdev() and just have it return null when asked
1230 : : * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1231 : : *
1232 : : if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1233 : : ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1234 : : == 0))
1235 : : return;
1236 : : */
1237 : : /*
1238 : : * If this device is known to support multiple units, override
1239 : : * the other settings, and scan all of them.
1240 : : */
1241 [ # # ]: 0 : if (bflags & BLIST_FORCELUN)
1242 : 0 : max_dev_lun = shost->max_lun;
1243 : : /*
1244 : : * REGAL CDC-4X: avoid hang after LUN 4
1245 : : */
1246 [ # # ]: 0 : if (bflags & BLIST_MAX5LUN)
1247 : 0 : max_dev_lun = min(5U, max_dev_lun);
1248 : : /*
1249 : : * Do not scan SCSI-2 or lower device past LUN 7, unless
1250 : : * BLIST_LARGELUN.
1251 : : */
1252 [ # # # # ]: 0 : if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1253 : 0 : max_dev_lun = min(8U, max_dev_lun);
1254 : : else
1255 : 0 : max_dev_lun = min(256U, max_dev_lun);
1256 : :
1257 : : /*
1258 : : * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1259 : : * until we reach the max, or no LUN is found and we are not
1260 : : * sparse_lun.
1261 : : */
1262 [ # # ]: 0 : for (lun = 1; lun < max_dev_lun; ++lun)
1263 [ # # ]: 0 : if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1264 [ # # ]: 0 : NULL) != SCSI_SCAN_LUN_PRESENT) &&
1265 : : !sparse_lun)
1266 : 0 : return;
1267 : : }
1268 : :
1269 : : /**
1270 : : * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
1271 : : * @starget: which target
1272 : : * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1273 : : * @rescan: nonzero if we can skip code only needed on first scan
1274 : : *
1275 : : * Description:
1276 : : * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1277 : : * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
1278 : : *
1279 : : * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1280 : : * LUNs even if it's older than SCSI-3.
1281 : : * If BLIST_NOREPORTLUN is set, return 1 always.
1282 : : * If BLIST_NOLUN is set, return 0 always.
1283 : : * If starget->no_report_luns is set, return 1 always.
1284 : : *
1285 : : * Return:
1286 : : * 0: scan completed (or no memory, so further scanning is futile)
1287 : : * 1: could not scan with REPORT LUN
1288 : : **/
1289 : 0 : static int scsi_report_lun_scan(struct scsi_target *starget, blist_flags_t bflags,
1290 : : enum scsi_scan_mode rescan)
1291 : : {
1292 : : unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1293 : : unsigned int length;
1294 : : u64 lun;
1295 : : unsigned int num_luns;
1296 : : unsigned int retries;
1297 : : int result;
1298 : : struct scsi_lun *lunp, *lun_data;
1299 : : struct scsi_sense_hdr sshdr;
1300 : : struct scsi_device *sdev;
1301 : 0 : struct Scsi_Host *shost = dev_to_shost(&starget->dev);
1302 : : int ret = 0;
1303 : :
1304 : : /*
1305 : : * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1306 : : * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1307 : : * support more than 8 LUNs.
1308 : : * Don't attempt if the target doesn't support REPORT LUNS.
1309 : : */
1310 [ # # ]: 0 : if (bflags & BLIST_NOREPORTLUN)
1311 : : return 1;
1312 [ # # ]: 0 : if (starget->scsi_level < SCSI_2 &&
1313 : : starget->scsi_level != SCSI_UNKNOWN)
1314 : : return 1;
1315 [ # # # # ]: 0 : if (starget->scsi_level < SCSI_3 &&
1316 [ # # ]: 0 : (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
1317 : : return 1;
1318 [ # # ]: 0 : if (bflags & BLIST_NOLUN)
1319 : : return 0;
1320 [ # # ]: 0 : if (starget->no_report_luns)
1321 : : return 1;
1322 : :
1323 [ # # ]: 0 : if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1324 : 0 : sdev = scsi_alloc_sdev(starget, 0, NULL);
1325 [ # # ]: 0 : if (!sdev)
1326 : : return 0;
1327 [ # # ]: 0 : if (scsi_device_get(sdev)) {
1328 : 0 : __scsi_remove_device(sdev);
1329 : 0 : return 0;
1330 : : }
1331 : : }
1332 : :
1333 : : /*
1334 : : * Allocate enough to hold the header (the same size as one scsi_lun)
1335 : : * plus the number of luns we are requesting. 511 was the default
1336 : : * value of the now removed max_report_luns parameter.
1337 : : */
1338 : : length = (511 + 1) * sizeof(struct scsi_lun);
1339 : : retry:
1340 [ # # ]: 0 : lun_data = kmalloc(length, GFP_KERNEL |
1341 : 0 : (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
1342 [ # # ]: 0 : if (!lun_data) {
1343 : 0 : printk(ALLOC_FAILURE_MSG, __func__);
1344 : 0 : goto out;
1345 : : }
1346 : :
1347 : 0 : scsi_cmd[0] = REPORT_LUNS;
1348 : :
1349 : : /*
1350 : : * bytes 1 - 5: reserved, set to zero.
1351 : : */
1352 : 0 : memset(&scsi_cmd[1], 0, 5);
1353 : :
1354 : : /*
1355 : : * bytes 6 - 9: length of the command.
1356 : : */
1357 : : put_unaligned_be32(length, &scsi_cmd[6]);
1358 : :
1359 : 0 : scsi_cmd[10] = 0; /* reserved */
1360 : 0 : scsi_cmd[11] = 0; /* control */
1361 : :
1362 : : /*
1363 : : * We can get a UNIT ATTENTION, for example a power on/reset, so
1364 : : * retry a few times (like sd.c does for TEST UNIT READY).
1365 : : * Experience shows some combinations of adapter/devices get at
1366 : : * least two power on/resets.
1367 : : *
1368 : : * Illegal requests (for devices that do not support REPORT LUNS)
1369 : : * should come through as a check condition, and will not generate
1370 : : * a retry.
1371 : : */
1372 [ # # ]: 0 : for (retries = 0; retries < 3; retries++) {
1373 : : SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1374 : : "scsi scan: Sending REPORT LUNS to (try %d)\n",
1375 : : retries));
1376 : :
1377 : : result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
1378 : : lun_data, length, &sshdr,
1379 : : SCSI_REPORT_LUNS_TIMEOUT, 3, NULL);
1380 : :
1381 : : SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1382 : : "scsi scan: REPORT LUNS"
1383 : : " %s (try %d) result 0x%x\n",
1384 : : result ? "failed" : "successful",
1385 : : retries, result));
1386 [ # # ]: 0 : if (result == 0)
1387 : : break;
1388 [ # # ]: 0 : else if (scsi_sense_valid(&sshdr)) {
1389 [ # # ]: 0 : if (sshdr.sense_key != UNIT_ATTENTION)
1390 : : break;
1391 : : }
1392 : : }
1393 : :
1394 [ # # ]: 0 : if (result) {
1395 : : /*
1396 : : * The device probably does not support a REPORT LUN command
1397 : : */
1398 : : ret = 1;
1399 : : goto out_err;
1400 : : }
1401 : :
1402 : : /*
1403 : : * Get the length from the first four bytes of lun_data.
1404 : : */
1405 [ # # ]: 0 : if (get_unaligned_be32(lun_data->scsi_lun) +
1406 : : sizeof(struct scsi_lun) > length) {
1407 : : length = get_unaligned_be32(lun_data->scsi_lun) +
1408 : : sizeof(struct scsi_lun);
1409 : 0 : kfree(lun_data);
1410 : 0 : goto retry;
1411 : : }
1412 : : length = get_unaligned_be32(lun_data->scsi_lun);
1413 : :
1414 : 0 : num_luns = (length / sizeof(struct scsi_lun));
1415 : :
1416 : : SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1417 : : "scsi scan: REPORT LUN scan\n"));
1418 : :
1419 : : /*
1420 : : * Scan the luns in lun_data. The entry at offset 0 is really
1421 : : * the header, so start at 1 and go up to and including num_luns.
1422 : : */
1423 [ # # ]: 0 : for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1424 : 0 : lun = scsilun_to_int(lunp);
1425 : :
1426 [ # # ]: 0 : if (lun > sdev->host->max_lun) {
1427 : 0 : sdev_printk(KERN_WARNING, sdev,
1428 : : "lun%llu has a LUN larger than"
1429 : : " allowed by the host adapter\n", lun);
1430 : : } else {
1431 : : int res;
1432 : :
1433 : 0 : res = scsi_probe_and_add_lun(starget,
1434 : : lun, NULL, NULL, rescan, NULL);
1435 [ # # ]: 0 : if (res == SCSI_SCAN_NO_RESPONSE) {
1436 : : /*
1437 : : * Got some results, but now none, abort.
1438 : : */
1439 : 0 : sdev_printk(KERN_ERR, sdev,
1440 : : "Unexpected response"
1441 : : " from lun %llu while scanning, scan"
1442 : : " aborted\n", (unsigned long long)lun);
1443 : 0 : break;
1444 : : }
1445 : : }
1446 : : }
1447 : :
1448 : : out_err:
1449 : 0 : kfree(lun_data);
1450 : : out:
1451 [ # # ]: 0 : if (scsi_device_created(sdev))
1452 : : /*
1453 : : * the sdev we used didn't appear in the report luns scan
1454 : : */
1455 : 0 : __scsi_remove_device(sdev);
1456 : 0 : scsi_device_put(sdev);
1457 : 0 : return ret;
1458 : : }
1459 : :
1460 : 0 : struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1461 : : uint id, u64 lun, void *hostdata)
1462 : : {
1463 : 0 : struct scsi_device *sdev = ERR_PTR(-ENODEV);
1464 : 0 : struct device *parent = &shost->shost_gendev;
1465 : : struct scsi_target *starget;
1466 : :
1467 [ # # ]: 0 : if (strncmp(scsi_scan_type, "none", 4) == 0)
1468 : : return ERR_PTR(-ENODEV);
1469 : :
1470 : 0 : starget = scsi_alloc_target(parent, channel, id);
1471 [ # # ]: 0 : if (!starget)
1472 : : return ERR_PTR(-ENOMEM);
1473 : 0 : scsi_autopm_get_target(starget);
1474 : :
1475 : 0 : mutex_lock(&shost->scan_mutex);
1476 [ # # ]: 0 : if (!shost->async_scan)
1477 : 0 : scsi_complete_async_scans();
1478 : :
1479 [ # # # # ]: 0 : if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1480 : 0 : scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
1481 : 0 : scsi_autopm_put_host(shost);
1482 : : }
1483 : 0 : mutex_unlock(&shost->scan_mutex);
1484 : 0 : scsi_autopm_put_target(starget);
1485 : : /*
1486 : : * paired with scsi_alloc_target(). Target will be destroyed unless
1487 : : * scsi_probe_and_add_lun made an underlying device visible
1488 : : */
1489 : 0 : scsi_target_reap(starget);
1490 : 0 : put_device(&starget->dev);
1491 : :
1492 : 0 : return sdev;
1493 : : }
1494 : : EXPORT_SYMBOL(__scsi_add_device);
1495 : :
1496 : 0 : int scsi_add_device(struct Scsi_Host *host, uint channel,
1497 : : uint target, u64 lun)
1498 : : {
1499 : 0 : struct scsi_device *sdev =
1500 : : __scsi_add_device(host, channel, target, lun, NULL);
1501 [ # # ]: 0 : if (IS_ERR(sdev))
1502 : 0 : return PTR_ERR(sdev);
1503 : :
1504 : 0 : scsi_device_put(sdev);
1505 : 0 : return 0;
1506 : : }
1507 : : EXPORT_SYMBOL(scsi_add_device);
1508 : :
1509 : 0 : void scsi_rescan_device(struct device *dev)
1510 : : {
1511 : 0 : struct scsi_device *sdev = to_scsi_device(dev);
1512 : :
1513 : : device_lock(dev);
1514 : :
1515 : 0 : scsi_attach_vpd(sdev);
1516 : :
1517 [ # # # # ]: 0 : if (sdev->handler && sdev->handler->rescan)
1518 : 0 : sdev->handler->rescan(sdev);
1519 : :
1520 [ # # # # ]: 0 : if (dev->driver && try_module_get(dev->driver->owner)) {
1521 : 0 : struct scsi_driver *drv = to_scsi_driver(dev->driver);
1522 : :
1523 [ # # ]: 0 : if (drv->rescan)
1524 : 0 : drv->rescan(dev);
1525 : 0 : module_put(dev->driver->owner);
1526 : : }
1527 : : device_unlock(dev);
1528 : 0 : }
1529 : : EXPORT_SYMBOL(scsi_rescan_device);
1530 : :
1531 : 0 : static void __scsi_scan_target(struct device *parent, unsigned int channel,
1532 : : unsigned int id, u64 lun, enum scsi_scan_mode rescan)
1533 : : {
1534 : 0 : struct Scsi_Host *shost = dev_to_shost(parent);
1535 : 0 : blist_flags_t bflags = 0;
1536 : : int res;
1537 : : struct scsi_target *starget;
1538 : :
1539 [ # # ]: 0 : if (shost->this_id == id)
1540 : : /*
1541 : : * Don't scan the host adapter
1542 : : */
1543 : 0 : return;
1544 : :
1545 : 0 : starget = scsi_alloc_target(parent, channel, id);
1546 [ # # ]: 0 : if (!starget)
1547 : : return;
1548 : 0 : scsi_autopm_get_target(starget);
1549 : :
1550 [ # # ]: 0 : if (lun != SCAN_WILD_CARD) {
1551 : : /*
1552 : : * Scan for a specific host/chan/id/lun.
1553 : : */
1554 : 0 : scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1555 : 0 : goto out_reap;
1556 : : }
1557 : :
1558 : : /*
1559 : : * Scan LUN 0, if there is some response, scan further. Ideally, we
1560 : : * would not configure LUN 0 until all LUNs are scanned.
1561 : : */
1562 : 0 : res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1563 [ # # ]: 0 : if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1564 [ # # ]: 0 : if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
1565 : : /*
1566 : : * The REPORT LUN did not scan the target,
1567 : : * do a sequential scan.
1568 : : */
1569 : 0 : scsi_sequential_lun_scan(starget, bflags,
1570 : 0 : starget->scsi_level, rescan);
1571 : : }
1572 : :
1573 : : out_reap:
1574 : 0 : scsi_autopm_put_target(starget);
1575 : : /*
1576 : : * paired with scsi_alloc_target(): determine if the target has
1577 : : * any children at all and if not, nuke it
1578 : : */
1579 : 0 : scsi_target_reap(starget);
1580 : :
1581 : 0 : put_device(&starget->dev);
1582 : : }
1583 : :
1584 : : /**
1585 : : * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
1586 : : * @parent: host to scan
1587 : : * @channel: channel to scan
1588 : : * @id: target id to scan
1589 : : * @lun: Specific LUN to scan or SCAN_WILD_CARD
1590 : : * @rescan: passed to LUN scanning routines; SCSI_SCAN_INITIAL for
1591 : : * no rescan, SCSI_SCAN_RESCAN to rescan existing LUNs,
1592 : : * and SCSI_SCAN_MANUAL to force scanning even if
1593 : : * 'scan=manual' is set.
1594 : : *
1595 : : * Description:
1596 : : * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1597 : : * and possibly all LUNs on the target id.
1598 : : *
1599 : : * First try a REPORT LUN scan, if that does not scan the target, do a
1600 : : * sequential scan of LUNs on the target id.
1601 : : **/
1602 : 0 : void scsi_scan_target(struct device *parent, unsigned int channel,
1603 : : unsigned int id, u64 lun, enum scsi_scan_mode rescan)
1604 : : {
1605 : 0 : struct Scsi_Host *shost = dev_to_shost(parent);
1606 : :
1607 [ # # ]: 0 : if (strncmp(scsi_scan_type, "none", 4) == 0)
1608 : : return;
1609 : :
1610 [ # # # # ]: 0 : if (rescan != SCSI_SCAN_MANUAL &&
1611 : 0 : strncmp(scsi_scan_type, "manual", 6) == 0)
1612 : : return;
1613 : :
1614 : 0 : mutex_lock(&shost->scan_mutex);
1615 [ # # ]: 0 : if (!shost->async_scan)
1616 : 0 : scsi_complete_async_scans();
1617 : :
1618 [ # # # # ]: 0 : if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1619 : 0 : __scsi_scan_target(parent, channel, id, lun, rescan);
1620 : 0 : scsi_autopm_put_host(shost);
1621 : : }
1622 : 0 : mutex_unlock(&shost->scan_mutex);
1623 : : }
1624 : : EXPORT_SYMBOL(scsi_scan_target);
1625 : :
1626 : 0 : static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1627 : : unsigned int id, u64 lun,
1628 : : enum scsi_scan_mode rescan)
1629 : : {
1630 : : uint order_id;
1631 : :
1632 [ # # ]: 0 : if (id == SCAN_WILD_CARD)
1633 [ # # ]: 0 : for (id = 0; id < shost->max_id; ++id) {
1634 : : /*
1635 : : * XXX adapter drivers when possible (FCP, iSCSI)
1636 : : * could modify max_id to match the current max,
1637 : : * not the absolute max.
1638 : : *
1639 : : * XXX add a shost id iterator, so for example,
1640 : : * the FC ID can be the same as a target id
1641 : : * without a huge overhead of sparse id's.
1642 : : */
1643 [ # # ]: 0 : if (shost->reverse_ordering)
1644 : : /*
1645 : : * Scan from high to low id.
1646 : : */
1647 : 0 : order_id = shost->max_id - id - 1;
1648 : : else
1649 : : order_id = id;
1650 : 0 : __scsi_scan_target(&shost->shost_gendev, channel,
1651 : : order_id, lun, rescan);
1652 : : }
1653 : : else
1654 : 0 : __scsi_scan_target(&shost->shost_gendev, channel,
1655 : : id, lun, rescan);
1656 : 0 : }
1657 : :
1658 : 0 : int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1659 : : unsigned int id, u64 lun,
1660 : : enum scsi_scan_mode rescan)
1661 : : {
1662 : : SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1663 : : "%s: <%u:%u:%llu>\n",
1664 : : __func__, channel, id, lun));
1665 : :
1666 [ # # # # : 0 : if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
# # ]
1667 [ # # # # ]: 0 : ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
1668 [ # # ]: 0 : ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun)))
1669 : : return -EINVAL;
1670 : :
1671 : 0 : mutex_lock(&shost->scan_mutex);
1672 [ # # ]: 0 : if (!shost->async_scan)
1673 : 0 : scsi_complete_async_scans();
1674 : :
1675 [ # # # # ]: 0 : if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
1676 [ # # ]: 0 : if (channel == SCAN_WILD_CARD)
1677 [ # # ]: 0 : for (channel = 0; channel <= shost->max_channel;
1678 : 0 : channel++)
1679 : 0 : scsi_scan_channel(shost, channel, id, lun,
1680 : : rescan);
1681 : : else
1682 : 0 : scsi_scan_channel(shost, channel, id, lun, rescan);
1683 : 0 : scsi_autopm_put_host(shost);
1684 : : }
1685 : 0 : mutex_unlock(&shost->scan_mutex);
1686 : :
1687 : 0 : return 0;
1688 : : }
1689 : :
1690 : 0 : static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1691 : : {
1692 : : struct scsi_device *sdev;
1693 [ # # ]: 0 : shost_for_each_device(sdev, shost) {
1694 : : /* target removed before the device could be added */
1695 [ # # ]: 0 : if (sdev->sdev_state == SDEV_DEL)
1696 : 0 : continue;
1697 : : /* If device is already visible, skip adding it to sysfs */
1698 [ # # ]: 0 : if (sdev->is_visible)
1699 : 0 : continue;
1700 [ # # # # ]: 0 : if (!scsi_host_scan_allowed(shost) ||
1701 : 0 : scsi_sysfs_add_sdev(sdev) != 0)
1702 : 0 : __scsi_remove_device(sdev);
1703 : : }
1704 : 0 : }
1705 : :
1706 : : /**
1707 : : * scsi_prep_async_scan - prepare for an async scan
1708 : : * @shost: the host which will be scanned
1709 : : * Returns: a cookie to be passed to scsi_finish_async_scan()
1710 : : *
1711 : : * Tells the midlayer this host is going to do an asynchronous scan.
1712 : : * It reserves the host's position in the scanning list and ensures
1713 : : * that other asynchronous scans started after this one won't affect the
1714 : : * ordering of the discovered devices.
1715 : : */
1716 : 0 : static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
1717 : : {
1718 : : struct async_scan_data *data;
1719 : : unsigned long flags;
1720 : :
1721 [ # # ]: 0 : if (strncmp(scsi_scan_type, "sync", 4) == 0)
1722 : : return NULL;
1723 : :
1724 [ # # ]: 0 : if (shost->async_scan) {
1725 : 0 : shost_printk(KERN_DEBUG, shost, "%s called twice\n", __func__);
1726 : 0 : return NULL;
1727 : : }
1728 : :
1729 : : data = kmalloc(sizeof(*data), GFP_KERNEL);
1730 [ # # ]: 0 : if (!data)
1731 : : goto err;
1732 : 0 : data->shost = scsi_host_get(shost);
1733 [ # # ]: 0 : if (!data->shost)
1734 : : goto err;
1735 : : init_completion(&data->prev_finished);
1736 : :
1737 : 0 : mutex_lock(&shost->scan_mutex);
1738 : 0 : spin_lock_irqsave(shost->host_lock, flags);
1739 : 0 : shost->async_scan = 1;
1740 : 0 : spin_unlock_irqrestore(shost->host_lock, flags);
1741 : 0 : mutex_unlock(&shost->scan_mutex);
1742 : :
1743 : : spin_lock(&async_scan_lock);
1744 [ # # ]: 0 : if (list_empty(&scanning_hosts))
1745 : 0 : complete(&data->prev_finished);
1746 : 0 : list_add_tail(&data->list, &scanning_hosts);
1747 : : spin_unlock(&async_scan_lock);
1748 : :
1749 : 0 : return data;
1750 : :
1751 : : err:
1752 : 0 : kfree(data);
1753 : 0 : return NULL;
1754 : : }
1755 : :
1756 : : /**
1757 : : * scsi_finish_async_scan - asynchronous scan has finished
1758 : : * @data: cookie returned from earlier call to scsi_prep_async_scan()
1759 : : *
1760 : : * All the devices currently attached to this host have been found.
1761 : : * This function announces all the devices it has found to the rest
1762 : : * of the system.
1763 : : */
1764 : 0 : static void scsi_finish_async_scan(struct async_scan_data *data)
1765 : : {
1766 : : struct Scsi_Host *shost;
1767 : : unsigned long flags;
1768 : :
1769 [ # # ]: 0 : if (!data)
1770 : : return;
1771 : :
1772 : 0 : shost = data->shost;
1773 : :
1774 : 0 : mutex_lock(&shost->scan_mutex);
1775 : :
1776 [ # # ]: 0 : if (!shost->async_scan) {
1777 : 0 : shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
1778 : 0 : dump_stack();
1779 : 0 : mutex_unlock(&shost->scan_mutex);
1780 : 0 : return;
1781 : : }
1782 : :
1783 : 0 : wait_for_completion(&data->prev_finished);
1784 : :
1785 : 0 : scsi_sysfs_add_devices(shost);
1786 : :
1787 : 0 : spin_lock_irqsave(shost->host_lock, flags);
1788 : 0 : shost->async_scan = 0;
1789 : 0 : spin_unlock_irqrestore(shost->host_lock, flags);
1790 : :
1791 : 0 : mutex_unlock(&shost->scan_mutex);
1792 : :
1793 : : spin_lock(&async_scan_lock);
1794 : : list_del(&data->list);
1795 [ # # ]: 0 : if (!list_empty(&scanning_hosts)) {
1796 : 0 : struct async_scan_data *next = list_entry(scanning_hosts.next,
1797 : : struct async_scan_data, list);
1798 : 0 : complete(&next->prev_finished);
1799 : : }
1800 : : spin_unlock(&async_scan_lock);
1801 : :
1802 : 0 : scsi_autopm_put_host(shost);
1803 : 0 : scsi_host_put(shost);
1804 : 0 : kfree(data);
1805 : : }
1806 : :
1807 : 0 : static void do_scsi_scan_host(struct Scsi_Host *shost)
1808 : : {
1809 [ # # ]: 0 : if (shost->hostt->scan_finished) {
1810 : 0 : unsigned long start = jiffies;
1811 [ # # ]: 0 : if (shost->hostt->scan_start)
1812 : 0 : shost->hostt->scan_start(shost);
1813 : :
1814 [ # # ]: 0 : while (!shost->hostt->scan_finished(shost, jiffies - start))
1815 : 0 : msleep(10);
1816 : : } else {
1817 : 0 : scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1818 : : SCAN_WILD_CARD, 0);
1819 : : }
1820 : 0 : }
1821 : :
1822 : 0 : static void do_scan_async(void *_data, async_cookie_t c)
1823 : : {
1824 : : struct async_scan_data *data = _data;
1825 : 0 : struct Scsi_Host *shost = data->shost;
1826 : :
1827 : 0 : do_scsi_scan_host(shost);
1828 : 0 : scsi_finish_async_scan(data);
1829 : 0 : }
1830 : :
1831 : : /**
1832 : : * scsi_scan_host - scan the given adapter
1833 : : * @shost: adapter to scan
1834 : : **/
1835 : 0 : void scsi_scan_host(struct Scsi_Host *shost)
1836 : : {
1837 : : struct async_scan_data *data;
1838 : :
1839 [ # # # # ]: 0 : if (strncmp(scsi_scan_type, "none", 4) == 0 ||
1840 : 0 : strncmp(scsi_scan_type, "manual", 6) == 0)
1841 : : return;
1842 [ # # ]: 0 : if (scsi_autopm_get_host(shost) < 0)
1843 : : return;
1844 : :
1845 : 0 : data = scsi_prep_async_scan(shost);
1846 [ # # ]: 0 : if (!data) {
1847 : 0 : do_scsi_scan_host(shost);
1848 : 0 : scsi_autopm_put_host(shost);
1849 : 0 : return;
1850 : : }
1851 : :
1852 : : /* register with the async subsystem so wait_for_device_probe()
1853 : : * will flush this work
1854 : : */
1855 : : async_schedule(do_scan_async, data);
1856 : :
1857 : : /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
1858 : : }
1859 : : EXPORT_SYMBOL(scsi_scan_host);
1860 : :
1861 : 0 : void scsi_forget_host(struct Scsi_Host *shost)
1862 : : {
1863 : : struct scsi_device *sdev;
1864 : : unsigned long flags;
1865 : :
1866 : : restart:
1867 : 0 : spin_lock_irqsave(shost->host_lock, flags);
1868 [ # # ]: 0 : list_for_each_entry(sdev, &shost->__devices, siblings) {
1869 [ # # ]: 0 : if (sdev->sdev_state == SDEV_DEL)
1870 : 0 : continue;
1871 : 0 : spin_unlock_irqrestore(shost->host_lock, flags);
1872 : 0 : __scsi_remove_device(sdev);
1873 : 0 : goto restart;
1874 : : }
1875 : 0 : spin_unlock_irqrestore(shost->host_lock, flags);
1876 : 0 : }
1877 : :
1878 : : /**
1879 : : * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1880 : : * @shost: Host that needs a scsi_device
1881 : : *
1882 : : * Lock status: None assumed.
1883 : : *
1884 : : * Returns: The scsi_device or NULL
1885 : : *
1886 : : * Notes:
1887 : : * Attach a single scsi_device to the Scsi_Host - this should
1888 : : * be made to look like a "pseudo-device" that points to the
1889 : : * HA itself.
1890 : : *
1891 : : * Note - this device is not accessible from any high-level
1892 : : * drivers (including generics), which is probably not
1893 : : * optimal. We can add hooks later to attach.
1894 : : */
1895 : 0 : struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1896 : : {
1897 : : struct scsi_device *sdev = NULL;
1898 : : struct scsi_target *starget;
1899 : :
1900 : 0 : mutex_lock(&shost->scan_mutex);
1901 [ # # ]: 0 : if (!scsi_host_scan_allowed(shost))
1902 : : goto out;
1903 : 0 : starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1904 [ # # ]: 0 : if (!starget)
1905 : : goto out;
1906 : :
1907 : 0 : sdev = scsi_alloc_sdev(starget, 0, NULL);
1908 [ # # ]: 0 : if (sdev)
1909 : 0 : sdev->borken = 0;
1910 : : else
1911 : 0 : scsi_target_reap(starget);
1912 : 0 : put_device(&starget->dev);
1913 : : out:
1914 : 0 : mutex_unlock(&shost->scan_mutex);
1915 : 0 : return sdev;
1916 : : }
1917 : : EXPORT_SYMBOL(scsi_get_host_dev);
1918 : :
1919 : : /**
1920 : : * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1921 : : * @sdev: Host device to be freed
1922 : : *
1923 : : * Lock status: None assumed.
1924 : : *
1925 : : * Returns: Nothing
1926 : : */
1927 : 0 : void scsi_free_host_dev(struct scsi_device *sdev)
1928 : : {
1929 [ # # ]: 0 : BUG_ON(sdev->id != sdev->host->this_id);
1930 : :
1931 : 0 : __scsi_remove_device(sdev);
1932 : 0 : }
1933 : : EXPORT_SYMBOL(scsi_free_host_dev);
1934 : :
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