blob: 84b4879cff114f8a6e709deed6e18c67966d9140 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * scsi_scan.c
3 *
4 * Copyright (C) 2000 Eric Youngdale,
5 * Copyright (C) 2002 Patrick Mansfield
6 *
7 * The general scanning/probing algorithm is as follows, exceptions are
8 * made to it depending on device specific flags, compilation options, and
9 * global variable (boot or module load time) settings.
10 *
11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a
Christoph Hellwigf64a1812005-10-31 18:32:08 +010012 * device attached, a scsi_device is allocated and setup for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
14 * For every id of every channel on the given host:
15 *
16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no
17 * device or storage attached to LUN 0):
18 *
19 * If LUN 0 has a device attached, allocate and setup a
Christoph Hellwigf64a1812005-10-31 18:32:08 +010020 * scsi_device for it.
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 *
22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan
23 * all of the LUNs returned by the REPORT LUN; else,
24 * sequentially scan LUNs up until some maximum is reached,
25 * or a LUN is seen that cannot have a device attached to it.
26 */
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/init.h>
31#include <linux/blkdev.h>
Matthew Wilcox3e082a92006-09-28 15:19:20 -060032#include <linux/delay.h>
33#include <linux/kthread.h>
34#include <linux/spinlock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020037#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <scsi/scsi_device.h>
39#include <scsi/scsi_driver.h>
40#include <scsi/scsi_devinfo.h>
41#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#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/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010057 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 */
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
Arjan van de Ven0ad78202005-11-28 16:22:25 +010078static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80#define MAX_SCSI_LUNS 512
81
82#ifdef CONFIG_SCSI_MULTI_LUN
83static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
84#else
85static unsigned int max_scsi_luns = 1;
86#endif
87
Masatake YAMATO10f4b892007-09-19 22:59:16 +090088module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089MODULE_PARM_DESC(max_luns,
90 "last scsi LUN (should be between 1 and 2^32-1)");
91
Matthew Wilcox21db1882006-11-22 13:24:52 -070092#ifdef CONFIG_SCSI_SCAN_ASYNC
93#define SCSI_SCAN_TYPE_DEFAULT "async"
94#else
95#define SCSI_SCAN_TYPE_DEFAULT "sync"
96#endif
97
98static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -060099
100module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
101MODULE_PARM_DESC(scan, "sync, async or none");
102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103/*
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 */
110static unsigned int max_scsi_report_luns = 511;
111
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900112module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113MODULE_PARM_DESC(max_report_luns,
114 "REPORT LUNS maximum number of LUNS received (should be"
115 " between 1 and 16384)");
116
117static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
118
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900119module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120MODULE_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
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600124/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600125static DEFINE_SPINLOCK(async_scan_lock);
126static LIST_HEAD(scanning_hosts);
127
128struct 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 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700137 * 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.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600141 */
142int 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);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700173 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 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600178 done:
179 spin_unlock(&async_scan_lock);
180
181 kfree(data);
182 return 0;
183}
184
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600185/* Only exported for the benefit of scsi_wait_scan */
186EXPORT_SYMBOL_GPL(scsi_complete_async_scans);
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600187
Hugh Dickinsf2f027c2007-05-23 14:41:42 -0700188#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 */
194late_initcall(scsi_complete_async_scans);
195#endif
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197/**
198 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500199 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 * @result: area to store the result of the MODE SENSE
201 *
202 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500203 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 * Called for BLIST_KEY devices.
205 **/
James Bottomley39216032005-06-15 18:48:29 -0500206static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 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;
James Bottomley39216032005-06-15 18:48:29 -0500216 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500218 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
219 SCSI_TIMEOUT, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220}
221
222/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500224 * @starget: which target to allocate a &scsi_device for
225 * @lun: which lun
226 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 *
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 **/
236static 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);
Jeff Garzika341cd02007-10-29 17:15:22 -0400242 extern void scsi_evt_thread(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
Jes Sorensen24669f752006-01-16 10:31:18 -0500244 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 GFP_ATOMIC);
246 if (!sdev)
247 goto out;
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 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);
Jeff Garzika341cd02007-10-29 17:15:22 -0400261 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400263 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 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);
Dave Jones93f56082006-03-09 10:21:27 -0500292 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 */
308 if (ret == -ENXIO)
309 display_failure_msg = 0;
310 goto out_device_destroy;
311 }
312 }
313
314 return sdev;
315
316out_device_destroy:
317 transport_destroy_device(&sdev->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 put_device(&sdev->sdev_gendev);
319out:
320 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700321 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 return NULL;
323}
324
James Bottomley643eb2d2008-03-22 22:42:27 -0500325static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340static void scsi_target_dev_release(struct device *dev)
341{
342 struct device *parent = dev->parent;
343 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 kfree(starget);
346 put_device(parent);
347}
348
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700349static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100350 .name = "scsi_target",
351 .release = scsi_target_dev_release,
352};
353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354int scsi_is_target_device(const struct device *dev)
355{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100356 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358EXPORT_SYMBOL(scsi_is_target_device);
359
360static 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
James Bottomley884d25c2006-09-05 16:26:41 -0500381/**
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393static 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;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400401 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600403 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
Jes Sorensen24669f752006-01-16 10:31:18 -0500405 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700407 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 return NULL;
409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 dev = &starget->dev;
411 device_initialize(dev);
412 starget->reap_ref = 1;
413 dev->parent = get_device(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 sprintf(dev->bus_id, "target%d:%d:%d",
415 shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100416#ifndef CONFIG_SYSFS_DEPRECATED
417 dev->bus = &scsi_bus_type;
418#endif
419 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 starget->id = id;
421 starget->channel = channel;
422 INIT_LIST_HEAD(&starget->siblings);
423 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500424 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500425 starget->scsi_level = SCSI_2;
James Bottomleyffedb452006-02-23 14:27:18 -0600426 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 spin_lock_irqsave(shost->host_lock, flags);
428
429 found_target = __scsi_find_target(parent, channel, id);
430 if (found_target)
431 goto found;
432
433 list_add_tail(&starget->siblings, &shost->__targets);
434 spin_unlock_irqrestore(shost->host_lock, flags);
435 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500436 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500437 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600438 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500439
440 if(error) {
441 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
442 /* don't want scsi_target_reap to do the final
443 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500444 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500445 return NULL;
446 }
447 }
James Bottomley884d25c2006-09-05 16:26:41 -0500448 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500449
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 return starget;
451
452 found:
453 found_target->reap_ref++;
454 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600455 if (found_target->state != STARGET_DEL) {
James Bottomley884d25c2006-09-05 16:26:41 -0500456 put_device(parent);
James Bottomleyffedb452006-02-23 14:27:18 -0600457 kfree(starget);
458 return found_target;
459 }
460 /* Unfortunately, we found a dying target; need to
461 * wait until it's dead before we can get a new one */
462 put_device(&found_target->dev);
463 flush_scheduled_work();
464 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465}
466
David Howells65f27f32006-11-22 14:55:48 +0000467static void scsi_target_reap_usercontext(struct work_struct *work)
James Bottomley65110b22006-02-14 10:48:46 -0600468{
David Howells65f27f32006-11-22 14:55:48 +0000469 struct scsi_target *starget =
470 container_of(work, struct scsi_target, ew.work);
James Bottomley863a9302005-12-15 20:01:43 -0800471
James Bottomleyffedb452006-02-23 14:27:18 -0600472 transport_remove_device(&starget->dev);
473 device_del(&starget->dev);
James Bottomley643eb2d2008-03-22 22:42:27 -0500474 scsi_target_destroy(starget);
James Bottomley863a9302005-12-15 20:01:43 -0800475}
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477/**
478 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 * @starget: target to be checked
480 *
481 * This is used after removing a LUN or doing a last put of the target
482 * it checks atomically that nothing is using the target and removes
483 * it if so.
484 */
485void scsi_target_reap(struct scsi_target *starget)
486{
James Bottomleyffedb452006-02-23 14:27:18 -0600487 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
488 unsigned long flags;
James Bottomley643eb2d2008-03-22 22:42:27 -0500489 enum scsi_target_state state;
490 int empty;
James Bottomleyffedb452006-02-23 14:27:18 -0600491
492 spin_lock_irqsave(shost->host_lock, flags);
James Bottomley643eb2d2008-03-22 22:42:27 -0500493 state = starget->state;
494 empty = --starget->reap_ref == 0 &&
495 list_empty(&starget->devices) ? 1 : 0;
James Bottomleyffedb452006-02-23 14:27:18 -0600496 spin_unlock_irqrestore(shost->host_lock, flags);
497
James Bottomley643eb2d2008-03-22 22:42:27 -0500498 if (!empty)
499 return;
500
501 BUG_ON(state == STARGET_DEL);
502 starget->state = STARGET_DEL;
503 if (state == STARGET_CREATED)
504 scsi_target_destroy(starget);
505 else
506 execute_in_process_context(scsi_target_reap_usercontext,
507 &starget->ew);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508}
509
510/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400511 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
512 * @s: INQUIRY result string to sanitize
513 * @len: length of the string
514 *
515 * Description:
516 * The SCSI spec says that INQUIRY vendor, product, and revision
517 * strings must consist entirely of graphic ASCII characters,
518 * padded on the right with spaces. Since not all devices obey
519 * this rule, we will replace non-graphic or non-ASCII characters
520 * with spaces. Exception: a NUL character is interpreted as a
521 * string terminator, so all the following characters are set to
522 * spaces.
523 **/
524static void sanitize_inquiry_string(unsigned char *s, int len)
525{
526 int terminated = 0;
527
528 for (; len > 0; (--len, ++s)) {
529 if (*s == 0)
530 terminated = 1;
531 if (terminated || *s < 0x20 || *s > 0x7e)
532 *s = ' ';
533 }
534}
535
536/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500538 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500540 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 * @bflags: store any bflags found here
542 *
543 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500544 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 *
James Bottomley39216032005-06-15 18:48:29 -0500546 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100548 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400550static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500551 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
554 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
555 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500556 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 struct scsi_sense_hdr sshdr;
558
559 *bflags = 0;
560
561 /* Perform up to 3 passes. The first pass uses a conservative
562 * transfer length of 36 unless sdev->inquiry_len specifies a
563 * different value. */
564 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
565 try_inquiry_len = first_inquiry_len;
566 pass = 1;
567
568 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500569 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
570 "scsi scan: INQUIRY pass %d length %d\n",
571 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
573 /* Each pass gets up to three chances to ignore Unit Attention */
574 for (count = 0; count < 3; ++count) {
575 memset(scsi_cmd, 0, 6);
576 scsi_cmd[0] = INQUIRY;
577 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500580
581 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500582 inq_result, try_inquiry_len, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -0500583 HZ / 2 + HZ * scsi_inq_timeout, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
586 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500587 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
James Bottomley39216032005-06-15 18:48:29 -0500589 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 /*
591 * not-ready to ready transition [asc/ascq=0x28/0x0]
592 * or power-on, reset [asc/ascq=0x29/0x0], continue.
593 * INQUIRY should not yield UNIT_ATTENTION
594 * but many buggy devices do so anyway.
595 */
James Bottomley39216032005-06-15 18:48:29 -0500596 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500597 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 if ((sshdr.sense_key == UNIT_ATTENTION) &&
599 ((sshdr.asc == 0x28) ||
600 (sshdr.asc == 0x29)) &&
601 (sshdr.ascq == 0))
602 continue;
603 }
604 }
605 break;
606 }
607
James Bottomley39216032005-06-15 18:48:29 -0500608 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400609 sanitize_inquiry_string(&inq_result[8], 8);
610 sanitize_inquiry_string(&inq_result[16], 16);
611 sanitize_inquiry_string(&inq_result[32], 4);
612
613 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 if (response_len > 255)
615 response_len = first_inquiry_len; /* sanity */
616
617 /*
618 * Get any flags for this device.
619 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100620 * XXX add a bflags to scsi_device, and replace the
621 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 * need not be passed as an argument.
623 */
624 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
625 &inq_result[16]);
626
627 /* When the first pass succeeds we gain information about
628 * what larger transfer lengths might work. */
629 if (pass == 1) {
630 if (BLIST_INQUIRY_36 & *bflags)
631 next_inquiry_len = 36;
632 else if (BLIST_INQUIRY_58 & *bflags)
633 next_inquiry_len = 58;
634 else if (sdev->inquiry_len)
635 next_inquiry_len = sdev->inquiry_len;
636 else
637 next_inquiry_len = response_len;
638
639 /* If more data is available perform the second pass */
640 if (next_inquiry_len > try_inquiry_len) {
641 try_inquiry_len = next_inquiry_len;
642 pass = 2;
643 goto next_pass;
644 }
645 }
646
647 } else if (pass == 2) {
648 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
649 "Consider BLIST_INQUIRY_36 for this device\n",
650 try_inquiry_len);
651
652 /* If this pass failed, the third pass goes back and transfers
653 * the same amount as we successfully got in the first pass. */
654 try_inquiry_len = first_inquiry_len;
655 pass = 3;
656 goto next_pass;
657 }
658
659 /* If the last transfer attempt got an error, assume the
660 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500661 if (result)
662 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
664 /* Don't report any more data than the device says is valid */
665 sdev->inquiry_len = min(try_inquiry_len, response_len);
666
667 /*
668 * XXX Abort if the response length is less than 36? If less than
669 * 32, the lookup of the device flags (above) could be invalid,
670 * and it would be possible to take an incorrect action - we do
671 * not want to hang because of a short INQUIRY. On the flip side,
672 * if the device is spun down or becoming ready (and so it gives a
673 * short INQUIRY), an abort here prevents any further use of the
674 * device, including spin up.
675 *
Alan Sterne423ee32007-02-16 01:46:38 -0800676 * On the whole, the best approach seems to be to assume the first
677 * 36 bytes are valid no matter what the device says. That's
678 * better than copying < 36 bytes to the inquiry-result buffer
679 * and displaying garbage for the Vendor, Product, or Revision
680 * strings.
681 */
682 if (sdev->inquiry_len < 36) {
683 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
684 " using 36\n", sdev->inquiry_len);
685 sdev->inquiry_len = 36;
686 }
687
688 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 * Related to the above issue:
690 *
691 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
692 * and if not ready, sent a START_STOP to start (maybe spin up) and
693 * then send the INQUIRY again, since the INQUIRY can change after
694 * a device is initialized.
695 *
696 * Ideally, start a device if explicitly asked to do so. This
697 * assumes that a device is spun up on power on, spun down on
698 * request, and then spun up on request.
699 */
700
701 /*
702 * The scanning code needs to know the scsi_level, even if no
703 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
704 * non-zero LUNs can be scanned.
705 */
706 sdev->scsi_level = inq_result[2] & 0x07;
707 if (sdev->scsi_level >= 2 ||
708 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
709 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500710 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
James Bottomley39216032005-06-15 18:48:29 -0500712 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713}
714
715/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100716 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600717 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 * @inq_result: holds the result of a previous INQUIRY to the LUN
719 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600720 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 *
722 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600723 * Initialize the scsi_device @sdev. Optionally set fields based
724 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 *
726 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100727 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
728 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400730static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600731 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732{
733 /*
734 * XXX do not save the inquiry, since it can change underneath us,
735 * save just vendor/model/rev.
736 *
737 * Rather than save it and have an ioctl that retrieves the saved
738 * value, have an ioctl that executes the same INQUIRY code used
739 * in scsi_probe_lun, let user level programs doing INQUIRY
740 * scanning run at their own risk, or supply a user level program
741 * that can correctly scan.
742 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
Alan Stern09123d22006-11-10 12:27:57 -0800744 /*
745 * Copy at least 36 bytes of INQUIRY data, so that we don't
746 * dereference unallocated memory when accessing the Vendor,
747 * Product, and Revision strings. Badly behaved devices may set
748 * the INQUIRY Additional Length byte to a small value, indicating
749 * these strings are invalid, but often they contain plausible data
750 * nonetheless. It doesn't matter if the device sent < 36 bytes
751 * total, since scsi_probe_lun() initializes inq_result with 0s.
752 */
753 sdev->inquiry = kmemdup(inq_result,
754 max_t(size_t, sdev->inquiry_len, 36),
755 GFP_ATOMIC);
756 if (sdev->inquiry == NULL)
757 return SCSI_SCAN_NO_RESPONSE;
758
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 sdev->vendor = (char *) (sdev->inquiry + 8);
760 sdev->model = (char *) (sdev->inquiry + 16);
761 sdev->rev = (char *) (sdev->inquiry + 32);
762
763 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600764 sdev->type = TYPE_ROM;
765 sdev->removable = 1;
766 } else {
767 sdev->type = (inq_result[0] & 0x1f);
768 sdev->removable = (inq_result[1] & 0x80) >> 7;
769 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
Matthew Wilcox6d877682007-07-11 12:54:55 -0600771 switch (sdev->type) {
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600772 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 case TYPE_TAPE:
774 case TYPE_DISK:
775 case TYPE_PRINTER:
776 case TYPE_MOD:
777 case TYPE_PROCESSOR:
778 case TYPE_SCANNER:
779 case TYPE_MEDIUM_CHANGER:
780 case TYPE_ENCLOSURE:
781 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600782 case TYPE_RAID:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 sdev->writeable = 1;
784 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 case TYPE_ROM:
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600786 case TYPE_WORM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 sdev->writeable = 0;
788 break;
789 default:
790 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
791 }
792
Matthew Wilcox6d877682007-07-11 12:54:55 -0600793 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
794 /* RBC and MMC devices can return SCSI-3 compliance and yet
795 * still not support REPORT LUNS, so make them act as
796 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
797 * specifically set */
798 if ((*bflags & BLIST_REPORTLUN2) == 0)
799 *bflags |= BLIST_NOREPORTLUN;
800 }
801
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 /*
803 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
804 * spec says: The device server is capable of supporting the
805 * specified peripheral device type on this logical unit. However,
806 * the physical device is not currently connected to this logical
807 * unit.
808 *
809 * The above is vague, as it implies that we could treat 001 and
810 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100811 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 *
813 * Don't set the device offline here; rather let the upper
814 * level drivers eval the PQ to decide whether they should
815 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
816 */
817
818 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 sdev->lockable = sdev->removable;
820 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
821
Matthew Wilcox6d877682007-07-11 12:54:55 -0600822 if (sdev->scsi_level >= SCSI_3 ||
823 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 sdev->ppr = 1;
825 if (inq_result[7] & 0x60)
826 sdev->wdtr = 1;
827 if (inq_result[7] & 0x10)
828 sdev->sdtr = 1;
829
James Bottomley19ac0db2006-08-06 18:15:22 -0500830 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600831 "ANSI: %d%s\n", scsi_device_type(sdev->type),
832 sdev->vendor, sdev->model, sdev->rev,
833 sdev->inq_periph_qual, inq_result[2] & 0x07,
834 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
835
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
837 !(*bflags & BLIST_NOTQ))
838 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600839
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 /*
841 * Some devices (Texel CD ROM drives) have handshaking problems
842 * when used with the Seagate controllers. borken is initialized
843 * to 1, and then set it to 0 here.
844 */
845 if ((*bflags & BLIST_BORKEN) == 0)
846 sdev->borken = 0;
847
Matthew Wilcox6d877682007-07-11 12:54:55 -0600848 if (*bflags & BLIST_NO_ULD_ATTACH)
849 sdev->no_uld_attach = 1;
850
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 /*
852 * Apparently some really broken devices (contrary to the SCSI
853 * standards) need to be selected without asserting ATN
854 */
855 if (*bflags & BLIST_SELECT_NO_ATN)
856 sdev->select_no_atn = 1;
857
858 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600859 * Maximum 512 sector transfer length
860 * broken RA4x00 Compaq Disk Array
861 */
862 if (*bflags & BLIST_MAX_512)
863 blk_queue_max_sectors(sdev->request_queue, 512);
864
865 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 * Some devices may not want to have a start command automatically
867 * issued when a device is added.
868 */
869 if (*bflags & BLIST_NOSTARTONADD)
870 sdev->no_start_on_add = 1;
871
872 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500873 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 sdev->use_10_for_rw = 1;
876
877 if (*bflags & BLIST_MS_SKIP_PAGE_08)
878 sdev->skip_ms_page_8 = 1;
879
880 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
881 sdev->skip_ms_page_3f = 1;
882
883 if (*bflags & BLIST_USE_10_BYTE_MS)
884 sdev->use_10_for_ms = 1;
885
886 /* set the device running here so that slave configure
887 * may do I/O */
888 scsi_device_set_state(sdev, SDEV_RUNNING);
889
890 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
891 sdev->use_192_bytes_for_3f = 1;
892
893 if (*bflags & BLIST_NOT_LOCKABLE)
894 sdev->lockable = 0;
895
896 if (*bflags & BLIST_RETRY_HWERROR)
897 sdev->retry_hwerror = 1;
898
899 transport_configure_device(&sdev->sdev_gendev);
900
Christoph Hellwig93805092006-02-17 12:11:29 +0100901 if (sdev->host->hostt->slave_configure) {
902 int ret = sdev->host->hostt->slave_configure(sdev);
903 if (ret) {
904 /*
905 * if LLDD reports slave not present, don't clutter
906 * console with alloc failure messages
907 */
908 if (ret != -ENXIO) {
909 sdev_printk(KERN_ERR, sdev,
910 "failed to configure device\n");
911 }
912 return SCSI_SCAN_NO_RESPONSE;
913 }
914 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915
916 /*
917 * Ok, the device is now all set up, we can
918 * register it and tell the rest of the kernel
919 * about it.
920 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600921 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700922 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
924 return SCSI_SCAN_LUN_PRESENT;
925}
926
James Bottomley6f3a2022005-09-22 20:33:28 -0500927static inline void scsi_destroy_sdev(struct scsi_device *sdev)
928{
Brian King309bd272006-06-27 11:10:43 -0500929 scsi_device_set_state(sdev, SDEV_DEL);
James Bottomley6f3a2022005-09-22 20:33:28 -0500930 if (sdev->host->hostt->slave_destroy)
931 sdev->host->hostt->slave_destroy(sdev);
932 transport_destroy_device(&sdev->sdev_gendev);
933 put_device(&sdev->sdev_gendev);
934}
935
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700936#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200937/**
Rob Landleyeb448202007-11-03 13:30:39 -0500938 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200939 * @buf: Output buffer with at least end-first+1 bytes of space
940 * @inq: Inquiry buffer (input)
941 * @first: Offset of string into inq
942 * @end: Index after last character in inq
943 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700944static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200945 unsigned first, unsigned end)
946{
947 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700948
949 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
950 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200951 buf[idx] = inq[idx+first];
952 term = idx+1;
953 } else {
954 buf[idx] = ' ';
955 }
956 }
957 buf[term] = 0;
958 return buf;
959}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700960#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500961
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962/**
963 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
964 * @starget: pointer to target device structure
965 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -0500967 * @sdevp: probe the LUN corresponding to this scsi_device
968 * @rescan: if nonzero skip some code only needed on first scan
969 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 *
971 * Description:
972 * Call scsi_probe_lun, if a LUN with an attached device is found,
973 * allocate and set it up by calling scsi_add_lun.
974 *
975 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100976 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
978 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100979 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 **/
981static int scsi_probe_and_add_lun(struct scsi_target *starget,
982 uint lun, int *bflagsp,
983 struct scsi_device **sdevp, int rescan,
984 void *hostdata)
985{
986 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -0500988 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
990
991 /*
992 * The rescan flag is used as an optimization, the first scan of a
993 * host adapter calls into here with rescan == 0.
994 */
James Bottomley6f3a2022005-09-22 20:33:28 -0500995 sdev = scsi_device_lookup_by_target(starget, lun);
996 if (sdev) {
997 if (rescan || sdev->sdev_state != SDEV_CREATED) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
999 "scsi scan: device exists on %s\n",
1000 sdev->sdev_gendev.bus_id));
1001 if (sdevp)
1002 *sdevp = sdev;
1003 else
1004 scsi_device_put(sdev);
1005
1006 if (bflagsp)
1007 *bflagsp = scsi_get_device_flags(sdev,
1008 sdev->vendor,
1009 sdev->model);
1010 return SCSI_SCAN_LUN_PRESENT;
1011 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001012 scsi_device_put(sdev);
1013 } else
1014 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 if (!sdev)
1016 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001017
1018 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001019 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001021 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
James Bottomley39216032005-06-15 18:48:29 -05001023 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 goto out_free_result;
1025
Kurt Garloff4186ab12006-04-03 15:16:48 +02001026 if (bflagsp)
1027 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 /*
1029 * result contains valid SCSI INQUIRY data.
1030 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001031 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 /*
1033 * For a Peripheral qualifier 3 (011b), the SCSI
1034 * spec says: The device server is not capable of
1035 * supporting a physical device on this logical
1036 * unit.
1037 *
1038 * For disks, this implies that there is no
1039 * logical disk configured at sdev->lun, but there
1040 * is a target id responding.
1041 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001042 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1043 " peripheral qualifier of 3, device not"
1044 " added\n"))
1045 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001046 SCSI_LOG_SCAN_BUS(1, {
1047 unsigned char vend[9];
1048 unsigned char mod[17];
1049
1050 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001051 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001052 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001053 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001054 scsi_inq_str(mod, result, 16, 32));
1055 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001056
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001057 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001058
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 res = SCSI_SCAN_TARGET_PRESENT;
1060 goto out_free_result;
1061 }
1062
Alan Stern1bfc5d92006-02-09 15:26:18 -05001063 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001064 * Some targets may set slight variations of PQ and PDT to signal
1065 * that no LUN is present, so don't add sdev in these cases.
1066 * Two specific examples are:
1067 * 1) NetApp targets: return PQ=1, PDT=0x1f
1068 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1069 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1070 *
1071 * References:
1072 * 1) SCSI SPC-3, pp. 145-146
1073 * PQ=1: "A peripheral device having the specified peripheral
1074 * device type is not connected to this logical unit. However, the
1075 * device server is capable of supporting the specified peripheral
1076 * device type on this logical unit."
1077 * PDT=0x1f: "Unknown or no device type"
1078 * 2) USB UFI 1.0, p. 20
1079 * PDT=00h Direct-access device (floppy)
1080 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001081 */
dave wysochanski84961f22006-08-09 14:56:32 -04001082 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
1083 (result[0] & 0x1f) == 0x1f) {
Alan Stern1bfc5d92006-02-09 15:26:18 -05001084 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1085 "scsi scan: peripheral device type"
1086 " of 31, no device added\n"));
1087 res = SCSI_SCAN_TARGET_PRESENT;
1088 goto out_free_result;
1089 }
1090
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001091 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 if (res == SCSI_SCAN_LUN_PRESENT) {
1093 if (bflags & BLIST_KEY) {
1094 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001095 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 }
1098
1099 out_free_result:
1100 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 out_free_sdev:
1102 if (res == SCSI_SCAN_LUN_PRESENT) {
1103 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001104 if (scsi_device_get(sdev) == 0) {
1105 *sdevp = sdev;
1106 } else {
1107 __scsi_remove_device(sdev);
1108 res = SCSI_SCAN_NO_RESPONSE;
1109 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001111 } else
1112 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 out:
1114 return res;
1115}
1116
1117/**
1118 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1119 * @starget: pointer to target structure to scan
1120 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001121 * @scsi_level: Which version of the standard does this device adhere to
1122 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 *
1124 * Description:
1125 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1126 * scanned) to some maximum lun until a LUN is found with no device
1127 * attached. Use the bflags to figure out any oddities.
1128 *
1129 * Modifies sdevscan->lun.
1130 **/
1131static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001132 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133{
1134 unsigned int sparse_lun, lun, max_dev_lun;
1135 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1136
1137 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
1138 "%s\n", starget->dev.bus_id));
1139
1140 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1141 /*
1142 * If this device is known to support sparse multiple units,
1143 * override the other settings, and scan all of them. Normally,
1144 * SCSI-3 devices should be scanned via the REPORT LUNS.
1145 */
1146 if (bflags & BLIST_SPARSELUN) {
1147 max_dev_lun = shost->max_lun;
1148 sparse_lun = 1;
1149 } else
1150 sparse_lun = 0;
1151
1152 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 * If less than SCSI_1_CSS, and no special lun scaning, stop
1154 * scanning; this matches 2.4 behaviour, but could just be a bug
1155 * (to continue scanning a SCSI_1_CSS device).
1156 *
1157 * This test is broken. We might not have any device on lun0 for
1158 * a sparselun device, and if that's the case then how would we
1159 * know the real scsi_level, eh? It might make sense to just not
1160 * scan any SCSI_1 device for non-0 luns, but that check would best
1161 * go into scsi_alloc_sdev() and just have it return null when asked
1162 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1163 *
1164 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1165 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1166 == 0))
1167 return;
1168 */
1169 /*
1170 * If this device is known to support multiple units, override
1171 * the other settings, and scan all of them.
1172 */
1173 if (bflags & BLIST_FORCELUN)
1174 max_dev_lun = shost->max_lun;
1175 /*
1176 * REGAL CDC-4X: avoid hang after LUN 4
1177 */
1178 if (bflags & BLIST_MAX5LUN)
1179 max_dev_lun = min(5U, max_dev_lun);
1180 /*
1181 * Do not scan SCSI-2 or lower device past LUN 7, unless
1182 * BLIST_LARGELUN.
1183 */
1184 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1185 max_dev_lun = min(8U, max_dev_lun);
1186
1187 /*
1188 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1189 * until we reach the max, or no LUN is found and we are not
1190 * sparse_lun.
1191 */
1192 for (lun = 1; lun < max_dev_lun; ++lun)
1193 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1194 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1195 !sparse_lun)
1196 return;
1197}
1198
1199/**
1200 * scsilun_to_int: convert a scsi_lun to an int
1201 * @scsilun: struct scsi_lun to be converted.
1202 *
1203 * Description:
1204 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1205 * integer, and return the result. The caller must check for
1206 * truncation before using this function.
1207 *
1208 * Notes:
1209 * The struct scsi_lun is assumed to be four levels, with each level
1210 * effectively containing a SCSI byte-ordered (big endian) short; the
1211 * addressing bits of each level are ignored (the highest two bits).
1212 * For a description of the LUN format, post SCSI-3 see the SCSI
1213 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1214 *
1215 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1216 * the integer: 0x0b030a04
1217 **/
Christof Schmitt462b7852007-06-19 10:25:30 +02001218int scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219{
1220 int i;
1221 unsigned int lun;
1222
1223 lun = 0;
1224 for (i = 0; i < sizeof(lun); i += 2)
1225 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1226 scsilun->scsi_lun[i + 1]) << (i * 8));
1227 return lun;
1228}
Christof Schmitt462b7852007-06-19 10:25:30 +02001229EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
1231/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001232 * int_to_scsilun: reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001233 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001234 * @scsilun: struct scsi_lun to be set.
1235 *
1236 * Description:
1237 * Reverts the functionality of the scsilun_to_int, which packed
1238 * an 8-byte lun value into an int. This routine unpacks the int
1239 * back into the lun value.
1240 * Note: the scsilun_to_int() routine does not truly handle all
1241 * 8bytes of the lun value. This functions restores only as much
1242 * as was set by the routine.
1243 *
1244 * Notes:
1245 * Given an integer : 0x0b030a04, this function returns a
1246 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1247 *
1248 **/
1249void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1250{
1251 int i;
1252
1253 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1254
1255 for (i = 0; i < sizeof(lun); i += 2) {
1256 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1257 scsilun->scsi_lun[i+1] = lun & 0xFF;
1258 lun = lun >> 16;
1259 }
1260}
1261EXPORT_SYMBOL(int_to_scsilun);
1262
1263/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001264 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001265 * @starget: which target
1266 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1267 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 *
1269 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001270 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1271 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 *
Rob Landleyeb448202007-11-03 13:30:39 -05001273 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1274 * LUNs even if it's older than SCSI-3.
1275 * If BLIST_NOREPORTLUN is set, return 1 always.
1276 * If BLIST_NOLUN is set, return 0 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 *
1278 * Return:
1279 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001280 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001282static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 int rescan)
1284{
1285 char devname[64];
1286 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1287 unsigned int length;
1288 unsigned int lun;
1289 unsigned int num_luns;
1290 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001291 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 u8 *data;
1294 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001295 struct scsi_device *sdev;
1296 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001297 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
1299 /*
1300 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1301 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1302 * support more than 8 LUNs.
1303 */
James Bottomley4d7db042006-03-31 20:07:45 -06001304 if (bflags & BLIST_NOREPORTLUN)
1305 return 1;
1306 if (starget->scsi_level < SCSI_2 &&
1307 starget->scsi_level != SCSI_UNKNOWN)
1308 return 1;
1309 if (starget->scsi_level < SCSI_3 &&
1310 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 return 1;
1312 if (bflags & BLIST_NOLUN)
1313 return 0;
1314
James Bottomley6f3a2022005-09-22 20:33:28 -05001315 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1316 sdev = scsi_alloc_sdev(starget, 0, NULL);
1317 if (!sdev)
1318 return 0;
1319 if (scsi_device_get(sdev))
1320 return 0;
1321 }
1322
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001324 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
1326 /*
1327 * Allocate enough to hold the header (the same size as one scsi_lun)
1328 * plus the max number of luns we are requesting.
1329 *
1330 * Reallocating and trying again (with the exact amount we need)
1331 * would be nice, but then we need to somehow limit the size
1332 * allocated based on the available memory and the limits of
1333 * kmalloc - we don't want a kmalloc() failure of a huge value to
1334 * prevent us from finding any LUNs on this target.
1335 */
1336 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1337 lun_data = kmalloc(length, GFP_ATOMIC |
1338 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001339 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001340 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001341 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001342 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343
1344 scsi_cmd[0] = REPORT_LUNS;
1345
1346 /*
1347 * bytes 1 - 5: reserved, set to zero.
1348 */
1349 memset(&scsi_cmd[1], 0, 5);
1350
1351 /*
1352 * bytes 6 - 9: length of the command.
1353 */
1354 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1355 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1356 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1357 scsi_cmd[9] = (unsigned char) length & 0xff;
1358
1359 scsi_cmd[10] = 0; /* reserved */
1360 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361
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 for (retries = 0; retries < 3; retries++) {
1373 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1374 " REPORT LUNS to %s (try %d)\n", devname,
1375 retries));
James Bottomley39216032005-06-15 18:48:29 -05001376
James Bottomley39216032005-06-15 18:48:29 -05001377 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001378 lun_data, length, &sshdr,
James Bottomley39216032005-06-15 18:48:29 -05001379 SCSI_TIMEOUT + 4 * HZ, 3);
1380
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001382 " %s (try %d) result 0x%x\n", result
1383 ? "failed" : "successful", retries, result));
1384 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001386 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 if (sshdr.sense_key != UNIT_ATTENTION)
1388 break;
1389 }
1390 }
1391
James Bottomley39216032005-06-15 18:48:29 -05001392 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 /*
1394 * The device probably does not support a REPORT LUN command
1395 */
Alan Stern2ef89192005-11-08 15:51:55 -05001396 ret = 1;
1397 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
1400 /*
1401 * Get the length from the first four bytes of lun_data.
1402 */
1403 data = (u8 *) lun_data->scsi_lun;
1404 length = ((data[0] << 24) | (data[1] << 16) |
1405 (data[2] << 8) | (data[3] << 0));
1406
1407 num_luns = (length / sizeof(struct scsi_lun));
1408 if (num_luns > max_scsi_report_luns) {
1409 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1410 " of %d luns reported, try increasing"
1411 " max_scsi_report_luns.\n", devname,
1412 max_scsi_report_luns, num_luns);
1413 num_luns = max_scsi_report_luns;
1414 }
1415
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001416 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1417 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
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 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1424 lun = scsilun_to_int(lunp);
1425
1426 /*
1427 * Check if the unused part of lunp is non-zero, and so
1428 * does not fit in lun.
1429 */
1430 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1431 int i;
1432
1433 /*
1434 * Output an error displaying the LUN in byte order,
1435 * this differs from what linux would print for the
1436 * integer LUN value.
1437 */
1438 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1439 data = (char *)lunp->scsi_lun;
1440 for (i = 0; i < sizeof(struct scsi_lun); i++)
1441 printk("%02x", data[i]);
1442 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 } else if (lun > sdev->host->max_lun) {
1444 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1445 " than allowed by the host adapter\n",
1446 devname, lun);
1447 } else {
1448 int res;
1449
1450 res = scsi_probe_and_add_lun(starget,
1451 lun, NULL, NULL, rescan, NULL);
1452 if (res == SCSI_SCAN_NO_RESPONSE) {
1453 /*
1454 * Got some results, but now none, abort.
1455 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001456 sdev_printk(KERN_ERR, sdev,
1457 "Unexpected response"
1458 " from lun %d while scanning, scan"
1459 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 break;
1461 }
1462 }
1463 }
1464
Alan Stern2ef89192005-11-08 15:51:55 -05001465 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001468 scsi_device_put(sdev);
1469 if (sdev->sdev_state == SDEV_CREATED)
1470 /*
1471 * the sdev we used didn't appear in the report luns scan
1472 */
1473 scsi_destroy_sdev(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001474 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475}
1476
1477struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1478 uint id, uint lun, void *hostdata)
1479{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001480 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001482 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001484 if (strncmp(scsi_scan_type, "none", 4) == 0)
1485 return ERR_PTR(-ENODEV);
1486
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001487 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 if (!starget)
1489 return ERR_PTR(-ENOMEM);
1490
Arjan van de Ven0b950672006-01-11 13:16:10 +01001491 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001492 if (!shost->async_scan)
1493 scsi_complete_async_scans();
1494
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001495 if (scsi_host_scan_allowed(shost))
1496 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001497 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 scsi_target_reap(starget);
1499 put_device(&starget->dev);
1500
1501 return sdev;
1502}
1503EXPORT_SYMBOL(__scsi_add_device);
1504
James Bottomley146f7262005-09-10 12:44:09 -05001505int scsi_add_device(struct Scsi_Host *host, uint channel,
1506 uint target, uint lun)
1507{
1508 struct scsi_device *sdev =
1509 __scsi_add_device(host, channel, target, lun, NULL);
1510 if (IS_ERR(sdev))
1511 return PTR_ERR(sdev);
1512
1513 scsi_device_put(sdev);
1514 return 0;
1515}
1516EXPORT_SYMBOL(scsi_add_device);
1517
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518void scsi_rescan_device(struct device *dev)
1519{
1520 struct scsi_driver *drv;
1521
1522 if (!dev->driver)
1523 return;
1524
1525 drv = to_scsi_driver(dev->driver);
1526 if (try_module_get(drv->owner)) {
1527 if (drv->rescan)
1528 drv->rescan(dev);
1529 module_put(drv->owner);
1530 }
1531}
1532EXPORT_SYMBOL(scsi_rescan_device);
1533
Alan Sterne517d312005-07-26 10:18:45 -04001534static void __scsi_scan_target(struct device *parent, unsigned int channel,
1535 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536{
1537 struct Scsi_Host *shost = dev_to_shost(parent);
1538 int bflags = 0;
1539 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 struct scsi_target *starget;
1541
1542 if (shost->this_id == id)
1543 /*
1544 * Don't scan the host adapter
1545 */
1546 return;
1547
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 if (!starget)
1550 return;
1551
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552 if (lun != SCAN_WILD_CARD) {
1553 /*
1554 * Scan for a specific host/chan/id/lun.
1555 */
1556 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1557 goto out_reap;
1558 }
1559
1560 /*
1561 * Scan LUN 0, if there is some response, scan further. Ideally, we
1562 * would not configure LUN 0 until all LUNs are scanned.
1563 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001564 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1565 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1566 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 /*
1568 * The REPORT LUN did not scan the target,
1569 * do a sequential scan.
1570 */
1571 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001572 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001574
1575 out_reap:
1576 /* now determine if the target has any children at all
1577 * and if not, nuke it */
1578 scsi_target_reap(starget);
1579
1580 put_device(&starget->dev);
1581}
Alan Sterne517d312005-07-26 10:18:45 -04001582
1583/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001584 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001585 * @parent: host to scan
1586 * @channel: channel to scan
1587 * @id: target id to scan
1588 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1589 * @rescan: passed to LUN scanning routines
1590 *
1591 * Description:
1592 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1593 * and possibly all LUNs on the target id.
1594 *
1595 * First try a REPORT LUN scan, if that does not scan the target, do a
1596 * sequential scan of LUNs on the target id.
1597 **/
1598void scsi_scan_target(struct device *parent, unsigned int channel,
1599 unsigned int id, unsigned int lun, int rescan)
1600{
1601 struct Scsi_Host *shost = dev_to_shost(parent);
1602
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001603 if (strncmp(scsi_scan_type, "none", 4) == 0)
1604 return;
1605
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001606 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001607 if (!shost->async_scan)
1608 scsi_complete_async_scans();
1609
Alan Sterne517d312005-07-26 10:18:45 -04001610 if (scsi_host_scan_allowed(shost))
1611 __scsi_scan_target(parent, channel, id, lun, rescan);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001612 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001613}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614EXPORT_SYMBOL(scsi_scan_target);
1615
1616static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1617 unsigned int id, unsigned int lun, int rescan)
1618{
1619 uint order_id;
1620
1621 if (id == SCAN_WILD_CARD)
1622 for (id = 0; id < shost->max_id; ++id) {
1623 /*
1624 * XXX adapter drivers when possible (FCP, iSCSI)
1625 * could modify max_id to match the current max,
1626 * not the absolute max.
1627 *
1628 * XXX add a shost id iterator, so for example,
1629 * the FC ID can be the same as a target id
1630 * without a huge overhead of sparse id's.
1631 */
1632 if (shost->reverse_ordering)
1633 /*
1634 * Scan from high to low id.
1635 */
1636 order_id = shost->max_id - id - 1;
1637 else
1638 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001639 __scsi_scan_target(&shost->shost_gendev, channel,
1640 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 }
1642 else
Alan Sterne517d312005-07-26 10:18:45 -04001643 __scsi_scan_target(&shost->shost_gendev, channel,
1644 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645}
1646
1647int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1648 unsigned int id, unsigned int lun, int rescan)
1649{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001650 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1651 "%s: <%u:%u:%u>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001652 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653
1654 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001655 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1657 return -EINVAL;
1658
Arjan van de Ven0b950672006-01-11 13:16:10 +01001659 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001660 if (!shost->async_scan)
1661 scsi_complete_async_scans();
1662
Mike Anderson82f29462005-06-16 11:14:33 -07001663 if (scsi_host_scan_allowed(shost)) {
1664 if (channel == SCAN_WILD_CARD)
1665 for (channel = 0; channel <= shost->max_channel;
1666 channel++)
1667 scsi_scan_channel(shost, channel, id, lun,
1668 rescan);
1669 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001671 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001672 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673
1674 return 0;
1675}
1676
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001677static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1678{
1679 struct scsi_device *sdev;
1680 shost_for_each_device(sdev, shost) {
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001681 if (!scsi_host_scan_allowed(shost) ||
1682 scsi_sysfs_add_sdev(sdev) != 0)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001683 scsi_destroy_sdev(sdev);
1684 }
1685}
1686
1687/**
1688 * scsi_prep_async_scan - prepare for an async scan
1689 * @shost: the host which will be scanned
1690 * Returns: a cookie to be passed to scsi_finish_async_scan()
1691 *
1692 * Tells the midlayer this host is going to do an asynchronous scan.
1693 * It reserves the host's position in the scanning list and ensures
1694 * that other asynchronous scans started after this one won't affect the
1695 * ordering of the discovered devices.
1696 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001697static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001698{
1699 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001700 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001701
1702 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1703 return NULL;
1704
1705 if (shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001706 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001707 shost->host_no);
1708 dump_stack();
1709 return NULL;
1710 }
1711
1712 data = kmalloc(sizeof(*data), GFP_KERNEL);
1713 if (!data)
1714 goto err;
1715 data->shost = scsi_host_get(shost);
1716 if (!data->shost)
1717 goto err;
1718 init_completion(&data->prev_finished);
1719
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001720 mutex_lock(&shost->scan_mutex);
1721 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001722 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001723 spin_unlock_irqrestore(shost->host_lock, flags);
1724 mutex_unlock(&shost->scan_mutex);
1725
1726 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001727 if (list_empty(&scanning_hosts))
1728 complete(&data->prev_finished);
1729 list_add_tail(&data->list, &scanning_hosts);
1730 spin_unlock(&async_scan_lock);
1731
1732 return data;
1733
1734 err:
1735 kfree(data);
1736 return NULL;
1737}
1738
1739/**
1740 * scsi_finish_async_scan - asynchronous scan has finished
1741 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1742 *
1743 * All the devices currently attached to this host have been found.
1744 * This function announces all the devices it has found to the rest
1745 * of the system.
1746 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001747static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001748{
1749 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001750 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001751
1752 if (!data)
1753 return;
1754
1755 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001756
1757 mutex_lock(&shost->scan_mutex);
1758
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001759 if (!shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001760 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001761 shost->host_no);
1762 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001763 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001764 return;
1765 }
1766
1767 wait_for_completion(&data->prev_finished);
1768
1769 scsi_sysfs_add_devices(shost);
1770
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001771 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001772 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001773 spin_unlock_irqrestore(shost->host_lock, flags);
1774
1775 mutex_unlock(&shost->scan_mutex);
1776
1777 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001778 list_del(&data->list);
1779 if (!list_empty(&scanning_hosts)) {
1780 struct async_scan_data *next = list_entry(scanning_hosts.next,
1781 struct async_scan_data, list);
1782 complete(&next->prev_finished);
1783 }
1784 spin_unlock(&async_scan_lock);
1785
1786 scsi_host_put(shost);
1787 kfree(data);
1788}
1789
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001790static void do_scsi_scan_host(struct Scsi_Host *shost)
1791{
1792 if (shost->hostt->scan_finished) {
1793 unsigned long start = jiffies;
1794 if (shost->hostt->scan_start)
1795 shost->hostt->scan_start(shost);
1796
1797 while (!shost->hostt->scan_finished(shost, jiffies - start))
1798 msleep(10);
1799 } else {
1800 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1801 SCAN_WILD_CARD, 0);
1802 }
1803}
1804
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001805static int do_scan_async(void *_data)
1806{
1807 struct async_scan_data *data = _data;
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001808 do_scsi_scan_host(data->shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001809 scsi_finish_async_scan(data);
1810 return 0;
1811}
1812
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813/**
1814 * scsi_scan_host - scan the given adapter
1815 * @shost: adapter to scan
1816 **/
1817void scsi_scan_host(struct Scsi_Host *shost)
1818{
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001819 struct task_struct *p;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001820 struct async_scan_data *data;
1821
1822 if (strncmp(scsi_scan_type, "none", 4) == 0)
1823 return;
1824
1825 data = scsi_prep_async_scan(shost);
1826 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001827 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001828 return;
1829 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001830
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001831 p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001832 if (IS_ERR(p))
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001833 do_scan_async(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834}
1835EXPORT_SYMBOL(scsi_scan_host);
1836
Linus Torvalds1da177e2005-04-16 15:20:36 -07001837void scsi_forget_host(struct Scsi_Host *shost)
1838{
Alan Sterna64358d2005-07-26 10:27:10 -04001839 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 unsigned long flags;
1841
Alan Sterna64358d2005-07-26 10:27:10 -04001842 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001844 list_for_each_entry(sdev, &shost->__devices, siblings) {
1845 if (sdev->sdev_state == SDEV_DEL)
1846 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001848 __scsi_remove_device(sdev);
1849 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 }
1851 spin_unlock_irqrestore(shost->host_lock, flags);
1852}
1853
1854/*
1855 * Function: scsi_get_host_dev()
1856 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001857 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001858 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001859 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 *
1861 * Lock status: None assumed.
1862 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001863 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 *
1865 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001866 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867 * be made to look like a "pseudo-device" that points to the
1868 * HA itself.
1869 *
1870 * Note - this device is not accessible from any high-level
1871 * drivers (including generics), which is probably not
1872 * optimal. We can add hooks later to attach
1873 */
1874struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1875{
Alan Sterne517d312005-07-26 10:18:45 -04001876 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001877 struct scsi_target *starget;
1878
Arjan van de Ven0b950672006-01-11 13:16:10 +01001879 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001880 if (!scsi_host_scan_allowed(shost))
1881 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1883 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001884 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885
1886 sdev = scsi_alloc_sdev(starget, 0, NULL);
1887 if (sdev) {
1888 sdev->sdev_gendev.parent = get_device(&starget->dev);
1889 sdev->borken = 0;
James Bottomley884d25c2006-09-05 16:26:41 -05001890 } else
1891 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001893 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001894 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895 return sdev;
1896}
1897EXPORT_SYMBOL(scsi_get_host_dev);
1898
1899/*
1900 * Function: scsi_free_host_dev()
1901 *
1902 * Purpose: Free a scsi_device that points to the host adapter itself.
1903 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001904 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 *
1906 * Lock status: None assumed.
1907 *
1908 * Returns: Nothing
1909 *
1910 * Notes:
1911 */
1912void scsi_free_host_dev(struct scsi_device *sdev)
1913{
1914 BUG_ON(sdev->id != sdev->host->this_id);
1915
James Bottomley6f3a2022005-09-22 20:33:28 -05001916 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917}
1918EXPORT_SYMBOL(scsi_free_host_dev);
1919