blob: a14d245a66b842c3bdfa619a04904fefd8e90db5 [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>
Arjan van de Ven4ace92f2009-01-04 05:32:28 -080035#include <linux/async.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020038#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <scsi/scsi_device.h>
40#include <scsi/scsi_driver.h>
41#include <scsi/scsi_devinfo.h>
42#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <scsi/scsi_transport.h>
44#include <scsi/scsi_eh.h>
45
46#include "scsi_priv.h"
47#include "scsi_logging.h"
48
49#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
50 " SCSI scanning, some SCSI devices might not be configured\n"
51
52/*
53 * Default timeout
54 */
55#define SCSI_TIMEOUT (2*HZ)
56
57/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010058 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 */
60#define SCSI_UID_SER_NUM 'S'
61#define SCSI_UID_UNKNOWN 'Z'
62
63/*
64 * Return values of some of the scanning functions.
65 *
66 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
67 * includes allocation or general failures preventing IO from being sent.
68 *
69 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
70 * on the given LUN.
71 *
72 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
73 * given LUN.
74 */
75#define SCSI_SCAN_NO_RESPONSE 0
76#define SCSI_SCAN_TARGET_PRESENT 1
77#define SCSI_SCAN_LUN_PRESENT 2
78
Arjan van de Ven0ad78202005-11-28 16:22:25 +010079static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
81#define MAX_SCSI_LUNS 512
82
83#ifdef CONFIG_SCSI_MULTI_LUN
84static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
85#else
86static unsigned int max_scsi_luns = 1;
87#endif
88
Masatake YAMATO10f4b892007-09-19 22:59:16 +090089module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090MODULE_PARM_DESC(max_luns,
91 "last scsi LUN (should be between 1 and 2^32-1)");
92
Matthew Wilcox21db1882006-11-22 13:24:52 -070093#ifdef CONFIG_SCSI_SCAN_ASYNC
94#define SCSI_SCAN_TYPE_DEFAULT "async"
95#else
96#define SCSI_SCAN_TYPE_DEFAULT "sync"
97#endif
98
99static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600100
101module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
102MODULE_PARM_DESC(scan, "sync, async or none");
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104/*
105 * max_scsi_report_luns: the maximum number of LUNS that will be
106 * returned from the REPORT LUNS command. 8 times this value must
107 * be allocated. In theory this could be up to an 8 byte value, but
108 * in practice, the maximum number of LUNs suppored by any device
109 * is about 16k.
110 */
111static unsigned int max_scsi_report_luns = 511;
112
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900113module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114MODULE_PARM_DESC(max_report_luns,
115 "REPORT LUNS maximum number of LUNS received (should be"
116 " between 1 and 16384)");
117
118static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
119
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900120module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121MODULE_PARM_DESC(inq_timeout,
122 "Timeout (in seconds) waiting for devices to answer INQUIRY."
123 " Default is 5. Some non-compliant devices need more.");
124
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600125/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600126static DEFINE_SPINLOCK(async_scan_lock);
127static LIST_HEAD(scanning_hosts);
128
129struct async_scan_data {
130 struct list_head list;
131 struct Scsi_Host *shost;
132 struct completion prev_finished;
133};
134
135/**
136 * scsi_complete_async_scans - Wait for asynchronous scans to complete
137 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700138 * When this function returns, any host which started scanning before
139 * this function was called will have finished its scan. Hosts which
140 * started scanning after this function was called may or may not have
141 * finished.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600142 */
143int scsi_complete_async_scans(void)
144{
145 struct async_scan_data *data;
146
147 do {
148 if (list_empty(&scanning_hosts))
149 return 0;
150 /* If we can't get memory immediately, that's OK. Just
151 * sleep a little. Even if we never get memory, the async
152 * scans will finish eventually.
153 */
154 data = kmalloc(sizeof(*data), GFP_KERNEL);
155 if (!data)
156 msleep(1);
157 } while (!data);
158
159 data->shost = NULL;
160 init_completion(&data->prev_finished);
161
162 spin_lock(&async_scan_lock);
163 /* Check that there's still somebody else on the list */
164 if (list_empty(&scanning_hosts))
165 goto done;
166 list_add_tail(&data->list, &scanning_hosts);
167 spin_unlock(&async_scan_lock);
168
169 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
170 wait_for_completion(&data->prev_finished);
171
172 spin_lock(&async_scan_lock);
173 list_del(&data->list);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700174 if (!list_empty(&scanning_hosts)) {
175 struct async_scan_data *next = list_entry(scanning_hosts.next,
176 struct async_scan_data, list);
177 complete(&next->prev_finished);
178 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600179 done:
180 spin_unlock(&async_scan_lock);
181
182 kfree(data);
Arjan van de Ven4ace92f2009-01-04 05:32:28 -0800183 /* Synchronize async operations globally */
184 async_synchronize_full();
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600185 return 0;
186}
187
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600188/* Only exported for the benefit of scsi_wait_scan */
189EXPORT_SYMBOL_GPL(scsi_complete_async_scans);
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600190
Hugh Dickinsf2f027c2007-05-23 14:41:42 -0700191#ifndef MODULE
192/*
193 * For async scanning we need to wait for all the scans to complete before
194 * trying to mount the root fs. Otherwise non-modular drivers may not be ready
195 * yet.
196 */
197late_initcall(scsi_complete_async_scans);
198#endif
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200/**
201 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500202 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 * @result: area to store the result of the MODE SENSE
204 *
205 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500206 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 * Called for BLIST_KEY devices.
208 **/
James Bottomley39216032005-06-15 18:48:29 -0500209static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 unsigned char *result)
211{
212 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
213
214 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
215 scsi_cmd[0] = MODE_SENSE;
216 scsi_cmd[1] = 0;
217 scsi_cmd[2] = 0x2e;
218 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500219 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500221 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900222 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
225/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500227 * @starget: which target to allocate a &scsi_device for
228 * @lun: which lun
229 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 *
231 * Description:
232 * Allocate, initialize for io, and return a pointer to a scsi_Device.
233 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
234 * adds scsi_Device to the appropriate list.
235 *
236 * Return value:
237 * scsi_Device pointer, or NULL on failure.
238 **/
239static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
240 unsigned int lun, void *hostdata)
241{
242 struct scsi_device *sdev;
243 int display_failure_msg = 1, ret;
244 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400245 extern void scsi_evt_thread(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Jes Sorensen24669f752006-01-16 10:31:18 -0500247 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 GFP_ATOMIC);
249 if (!sdev)
250 goto out;
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 sdev->vendor = scsi_null_device_strs;
253 sdev->model = scsi_null_device_strs;
254 sdev->rev = scsi_null_device_strs;
255 sdev->host = shost;
256 sdev->id = starget->id;
257 sdev->lun = lun;
258 sdev->channel = starget->channel;
259 sdev->sdev_state = SDEV_CREATED;
260 INIT_LIST_HEAD(&sdev->siblings);
261 INIT_LIST_HEAD(&sdev->same_target_siblings);
262 INIT_LIST_HEAD(&sdev->cmd_list);
263 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400264 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400266 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268 sdev->sdev_gendev.parent = get_device(&starget->dev);
269 sdev->sdev_target = starget;
270
271 /* usually NULL and set by ->slave_alloc instead */
272 sdev->hostdata = hostdata;
273
274 /* if the device needs this changing, it may do so in the
275 * slave_configure function */
276 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
277
278 /*
279 * Some low level driver could use device->type
280 */
281 sdev->type = -1;
282
283 /*
284 * Assume that the device will have handshaking problems,
285 * and then fix this field later if it turns out it
286 * doesn't
287 */
288 sdev->borken = 1;
289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 sdev->request_queue = scsi_alloc_queue(sdev);
291 if (!sdev->request_queue) {
292 /* release fn is set up in scsi_sysfs_device_initialise, so
293 * have to free and put manually here */
294 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500295 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 goto out;
297 }
298
299 sdev->request_queue->queuedata = sdev;
300 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
301
302 scsi_sysfs_device_initialize(sdev);
303
304 if (shost->hostt->slave_alloc) {
305 ret = shost->hostt->slave_alloc(sdev);
306 if (ret) {
307 /*
308 * if LLDD reports slave not present, don't clutter
309 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 */
311 if (ret == -ENXIO)
312 display_failure_msg = 0;
313 goto out_device_destroy;
314 }
315 }
316
317 return sdev;
318
319out_device_destroy:
James Smartc2f9e492009-01-27 11:41:36 -0500320 scsi_device_set_state(sdev, SDEV_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 transport_destroy_device(&sdev->sdev_gendev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 put_device(&sdev->sdev_gendev);
323out:
324 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700325 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 return NULL;
327}
328
James Bottomley643eb2d2008-03-22 22:42:27 -0500329static void scsi_target_destroy(struct scsi_target *starget)
330{
331 struct device *dev = &starget->dev;
332 struct Scsi_Host *shost = dev_to_shost(dev->parent);
333 unsigned long flags;
334
335 transport_destroy_device(dev);
336 spin_lock_irqsave(shost->host_lock, flags);
337 if (shost->hostt->target_destroy)
338 shost->hostt->target_destroy(starget);
339 list_del_init(&starget->siblings);
340 spin_unlock_irqrestore(shost->host_lock, flags);
341 put_device(dev);
342}
343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344static void scsi_target_dev_release(struct device *dev)
345{
346 struct device *parent = dev->parent;
347 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 kfree(starget);
350 put_device(parent);
351}
352
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700353static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100354 .name = "scsi_target",
355 .release = scsi_target_dev_release,
356};
357
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358int scsi_is_target_device(const struct device *dev)
359{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100360 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361}
362EXPORT_SYMBOL(scsi_is_target_device);
363
364static struct scsi_target *__scsi_find_target(struct device *parent,
365 int channel, uint id)
366{
367 struct scsi_target *starget, *found_starget = NULL;
368 struct Scsi_Host *shost = dev_to_shost(parent);
369 /*
370 * Search for an existing target for this sdev.
371 */
372 list_for_each_entry(starget, &shost->__targets, siblings) {
373 if (starget->id == id &&
374 starget->channel == channel) {
375 found_starget = starget;
376 break;
377 }
378 }
379 if (found_starget)
380 get_device(&found_starget->dev);
381
382 return found_starget;
383}
384
James Bottomley884d25c2006-09-05 16:26:41 -0500385/**
386 * scsi_alloc_target - allocate a new or find an existing target
387 * @parent: parent of the target (need not be a scsi host)
388 * @channel: target channel number (zero if no channels)
389 * @id: target id number
390 *
391 * Return an existing target if one exists, provided it hasn't already
392 * gone into STARGET_DEL state, otherwise allocate a new target.
393 *
394 * The target is returned with an incremented reference, so the caller
395 * is responsible for both reaping and doing a last put
396 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397static struct scsi_target *scsi_alloc_target(struct device *parent,
398 int channel, uint id)
399{
400 struct Scsi_Host *shost = dev_to_shost(parent);
401 struct device *dev = NULL;
402 unsigned long flags;
403 const int size = sizeof(struct scsi_target)
404 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400405 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600407 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Jes Sorensen24669f752006-01-16 10:31:18 -0500409 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700411 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 return NULL;
413 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 dev = &starget->dev;
415 device_initialize(dev);
416 starget->reap_ref = 1;
417 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100418 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100419#ifndef CONFIG_SYSFS_DEPRECATED
420 dev->bus = &scsi_bus_type;
421#endif
422 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 starget->id = id;
424 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500425 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 INIT_LIST_HEAD(&starget->siblings);
427 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500428 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500429 starget->scsi_level = SCSI_2;
James Bottomleyffedb452006-02-23 14:27:18 -0600430 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 spin_lock_irqsave(shost->host_lock, flags);
432
433 found_target = __scsi_find_target(parent, channel, id);
434 if (found_target)
435 goto found;
436
437 list_add_tail(&starget->siblings, &shost->__targets);
438 spin_unlock_irqrestore(shost->host_lock, flags);
439 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500440 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500441 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600442 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500443
444 if(error) {
445 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
446 /* don't want scsi_target_reap to do the final
447 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500448 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500449 return NULL;
450 }
451 }
James Bottomley884d25c2006-09-05 16:26:41 -0500452 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 return starget;
455
456 found:
457 found_target->reap_ref++;
458 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600459 if (found_target->state != STARGET_DEL) {
James Bottomley884d25c2006-09-05 16:26:41 -0500460 put_device(parent);
James Bottomleyffedb452006-02-23 14:27:18 -0600461 kfree(starget);
462 return found_target;
463 }
464 /* Unfortunately, we found a dying target; need to
465 * wait until it's dead before we can get a new one */
466 put_device(&found_target->dev);
467 flush_scheduled_work();
468 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469}
470
David Howells65f27f32006-11-22 14:55:48 +0000471static void scsi_target_reap_usercontext(struct work_struct *work)
James Bottomley65110b22006-02-14 10:48:46 -0600472{
David Howells65f27f32006-11-22 14:55:48 +0000473 struct scsi_target *starget =
474 container_of(work, struct scsi_target, ew.work);
James Bottomley863a9302005-12-15 20:01:43 -0800475
James Bottomleyffedb452006-02-23 14:27:18 -0600476 transport_remove_device(&starget->dev);
477 device_del(&starget->dev);
James Bottomley643eb2d2008-03-22 22:42:27 -0500478 scsi_target_destroy(starget);
James Bottomley863a9302005-12-15 20:01:43 -0800479}
480
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481/**
482 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 * @starget: target to be checked
484 *
485 * This is used after removing a LUN or doing a last put of the target
486 * it checks atomically that nothing is using the target and removes
487 * it if so.
488 */
489void scsi_target_reap(struct scsi_target *starget)
490{
James Bottomleyffedb452006-02-23 14:27:18 -0600491 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
492 unsigned long flags;
James Bottomley643eb2d2008-03-22 22:42:27 -0500493 enum scsi_target_state state;
494 int empty;
James Bottomleyffedb452006-02-23 14:27:18 -0600495
496 spin_lock_irqsave(shost->host_lock, flags);
James Bottomley643eb2d2008-03-22 22:42:27 -0500497 state = starget->state;
498 empty = --starget->reap_ref == 0 &&
499 list_empty(&starget->devices) ? 1 : 0;
James Bottomleyffedb452006-02-23 14:27:18 -0600500 spin_unlock_irqrestore(shost->host_lock, flags);
501
James Bottomley643eb2d2008-03-22 22:42:27 -0500502 if (!empty)
503 return;
504
505 BUG_ON(state == STARGET_DEL);
506 starget->state = STARGET_DEL;
507 if (state == STARGET_CREATED)
508 scsi_target_destroy(starget);
509 else
510 execute_in_process_context(scsi_target_reap_usercontext,
511 &starget->ew);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512}
513
514/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400515 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
516 * @s: INQUIRY result string to sanitize
517 * @len: length of the string
518 *
519 * Description:
520 * The SCSI spec says that INQUIRY vendor, product, and revision
521 * strings must consist entirely of graphic ASCII characters,
522 * padded on the right with spaces. Since not all devices obey
523 * this rule, we will replace non-graphic or non-ASCII characters
524 * with spaces. Exception: a NUL character is interpreted as a
525 * string terminator, so all the following characters are set to
526 * spaces.
527 **/
528static void sanitize_inquiry_string(unsigned char *s, int len)
529{
530 int terminated = 0;
531
532 for (; len > 0; (--len, ++s)) {
533 if (*s == 0)
534 terminated = 1;
535 if (terminated || *s < 0x20 || *s > 0x7e)
536 *s = ' ';
537 }
538}
539
540/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500542 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500544 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 * @bflags: store any bflags found here
546 *
547 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500548 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 *
James Bottomley39216032005-06-15 18:48:29 -0500550 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100552 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400554static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500555 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
558 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
559 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500560 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 struct scsi_sense_hdr sshdr;
562
563 *bflags = 0;
564
565 /* Perform up to 3 passes. The first pass uses a conservative
566 * transfer length of 36 unless sdev->inquiry_len specifies a
567 * different value. */
568 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
569 try_inquiry_len = first_inquiry_len;
570 pass = 1;
571
572 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500573 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
574 "scsi scan: INQUIRY pass %d length %d\n",
575 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
577 /* Each pass gets up to three chances to ignore Unit Attention */
578 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900579 int resid;
580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 memset(scsi_cmd, 0, 6);
582 scsi_cmd[0] = INQUIRY;
583 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500586
587 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500588 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900589 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900590 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
592 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
593 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500594 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
James Bottomley39216032005-06-15 18:48:29 -0500596 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 /*
598 * not-ready to ready transition [asc/ascq=0x28/0x0]
599 * or power-on, reset [asc/ascq=0x29/0x0], continue.
600 * INQUIRY should not yield UNIT_ATTENTION
601 * but many buggy devices do so anyway.
602 */
James Bottomley39216032005-06-15 18:48:29 -0500603 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500604 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if ((sshdr.sense_key == UNIT_ATTENTION) &&
606 ((sshdr.asc == 0x28) ||
607 (sshdr.asc == 0x29)) &&
608 (sshdr.ascq == 0))
609 continue;
610 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900611 } else {
612 /*
613 * if nothing was transferred, we try
614 * again. It's a workaround for some USB
615 * devices.
616 */
617 if (resid == try_inquiry_len)
618 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 }
620 break;
621 }
622
James Bottomley39216032005-06-15 18:48:29 -0500623 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400624 sanitize_inquiry_string(&inq_result[8], 8);
625 sanitize_inquiry_string(&inq_result[16], 16);
626 sanitize_inquiry_string(&inq_result[32], 4);
627
628 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 if (response_len > 255)
630 response_len = first_inquiry_len; /* sanity */
631
632 /*
633 * Get any flags for this device.
634 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100635 * XXX add a bflags to scsi_device, and replace the
636 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 * need not be passed as an argument.
638 */
639 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
640 &inq_result[16]);
641
642 /* When the first pass succeeds we gain information about
643 * what larger transfer lengths might work. */
644 if (pass == 1) {
645 if (BLIST_INQUIRY_36 & *bflags)
646 next_inquiry_len = 36;
647 else if (BLIST_INQUIRY_58 & *bflags)
648 next_inquiry_len = 58;
649 else if (sdev->inquiry_len)
650 next_inquiry_len = sdev->inquiry_len;
651 else
652 next_inquiry_len = response_len;
653
654 /* If more data is available perform the second pass */
655 if (next_inquiry_len > try_inquiry_len) {
656 try_inquiry_len = next_inquiry_len;
657 pass = 2;
658 goto next_pass;
659 }
660 }
661
662 } else if (pass == 2) {
663 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
664 "Consider BLIST_INQUIRY_36 for this device\n",
665 try_inquiry_len);
666
667 /* If this pass failed, the third pass goes back and transfers
668 * the same amount as we successfully got in the first pass. */
669 try_inquiry_len = first_inquiry_len;
670 pass = 3;
671 goto next_pass;
672 }
673
674 /* If the last transfer attempt got an error, assume the
675 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500676 if (result)
677 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
679 /* Don't report any more data than the device says is valid */
680 sdev->inquiry_len = min(try_inquiry_len, response_len);
681
682 /*
683 * XXX Abort if the response length is less than 36? If less than
684 * 32, the lookup of the device flags (above) could be invalid,
685 * and it would be possible to take an incorrect action - we do
686 * not want to hang because of a short INQUIRY. On the flip side,
687 * if the device is spun down or becoming ready (and so it gives a
688 * short INQUIRY), an abort here prevents any further use of the
689 * device, including spin up.
690 *
Alan Sterne423ee32007-02-16 01:46:38 -0800691 * On the whole, the best approach seems to be to assume the first
692 * 36 bytes are valid no matter what the device says. That's
693 * better than copying < 36 bytes to the inquiry-result buffer
694 * and displaying garbage for the Vendor, Product, or Revision
695 * strings.
696 */
697 if (sdev->inquiry_len < 36) {
698 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
699 " using 36\n", sdev->inquiry_len);
700 sdev->inquiry_len = 36;
701 }
702
703 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 * Related to the above issue:
705 *
706 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
707 * and if not ready, sent a START_STOP to start (maybe spin up) and
708 * then send the INQUIRY again, since the INQUIRY can change after
709 * a device is initialized.
710 *
711 * Ideally, start a device if explicitly asked to do so. This
712 * assumes that a device is spun up on power on, spun down on
713 * request, and then spun up on request.
714 */
715
716 /*
717 * The scanning code needs to know the scsi_level, even if no
718 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
719 * non-zero LUNs can be scanned.
720 */
721 sdev->scsi_level = inq_result[2] & 0x07;
722 if (sdev->scsi_level >= 2 ||
723 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
724 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500725 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726
James Bottomley39216032005-06-15 18:48:29 -0500727 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728}
729
730/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100731 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600732 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 * @inq_result: holds the result of a previous INQUIRY to the LUN
734 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600735 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 *
737 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600738 * Initialize the scsi_device @sdev. Optionally set fields based
739 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 *
741 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100742 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
743 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400745static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600746 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747{
James Bottomley6f4267e2008-08-22 16:53:31 -0500748 int ret;
749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 /*
751 * XXX do not save the inquiry, since it can change underneath us,
752 * save just vendor/model/rev.
753 *
754 * Rather than save it and have an ioctl that retrieves the saved
755 * value, have an ioctl that executes the same INQUIRY code used
756 * in scsi_probe_lun, let user level programs doing INQUIRY
757 * scanning run at their own risk, or supply a user level program
758 * that can correctly scan.
759 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Alan Stern09123d22006-11-10 12:27:57 -0800761 /*
762 * Copy at least 36 bytes of INQUIRY data, so that we don't
763 * dereference unallocated memory when accessing the Vendor,
764 * Product, and Revision strings. Badly behaved devices may set
765 * the INQUIRY Additional Length byte to a small value, indicating
766 * these strings are invalid, but often they contain plausible data
767 * nonetheless. It doesn't matter if the device sent < 36 bytes
768 * total, since scsi_probe_lun() initializes inq_result with 0s.
769 */
770 sdev->inquiry = kmemdup(inq_result,
771 max_t(size_t, sdev->inquiry_len, 36),
772 GFP_ATOMIC);
773 if (sdev->inquiry == NULL)
774 return SCSI_SCAN_NO_RESPONSE;
775
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 sdev->vendor = (char *) (sdev->inquiry + 8);
777 sdev->model = (char *) (sdev->inquiry + 16);
778 sdev->rev = (char *) (sdev->inquiry + 32);
779
780 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600781 sdev->type = TYPE_ROM;
782 sdev->removable = 1;
783 } else {
784 sdev->type = (inq_result[0] & 0x1f);
785 sdev->removable = (inq_result[1] & 0x80) >> 7;
786 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Matthew Wilcox6d877682007-07-11 12:54:55 -0600788 switch (sdev->type) {
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600789 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 case TYPE_TAPE:
791 case TYPE_DISK:
792 case TYPE_PRINTER:
793 case TYPE_MOD:
794 case TYPE_PROCESSOR:
795 case TYPE_SCANNER:
796 case TYPE_MEDIUM_CHANGER:
797 case TYPE_ENCLOSURE:
798 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600799 case TYPE_RAID:
Boaz Harrosh82443a52009-01-25 16:51:33 +0200800 case TYPE_OSD:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 sdev->writeable = 1;
802 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 case TYPE_ROM:
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600804 case TYPE_WORM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 sdev->writeable = 0;
806 break;
807 default:
808 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
809 }
810
Matthew Wilcox6d877682007-07-11 12:54:55 -0600811 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
812 /* RBC and MMC devices can return SCSI-3 compliance and yet
813 * still not support REPORT LUNS, so make them act as
814 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
815 * specifically set */
816 if ((*bflags & BLIST_REPORTLUN2) == 0)
817 *bflags |= BLIST_NOREPORTLUN;
818 }
819
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 /*
821 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
822 * spec says: The device server is capable of supporting the
823 * specified peripheral device type on this logical unit. However,
824 * the physical device is not currently connected to this logical
825 * unit.
826 *
827 * The above is vague, as it implies that we could treat 001 and
828 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100829 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 *
831 * Don't set the device offline here; rather let the upper
832 * level drivers eval the PQ to decide whether they should
833 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
834 */
835
836 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 sdev->lockable = sdev->removable;
838 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
839
Matthew Wilcox6d877682007-07-11 12:54:55 -0600840 if (sdev->scsi_level >= SCSI_3 ||
841 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 sdev->ppr = 1;
843 if (inq_result[7] & 0x60)
844 sdev->wdtr = 1;
845 if (inq_result[7] & 0x10)
846 sdev->sdtr = 1;
847
James Bottomley19ac0db2006-08-06 18:15:22 -0500848 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600849 "ANSI: %d%s\n", scsi_device_type(sdev->type),
850 sdev->vendor, sdev->model, sdev->rev,
851 sdev->inq_periph_qual, inq_result[2] & 0x07,
852 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
853
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
855 !(*bflags & BLIST_NOTQ))
856 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600857
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 /*
859 * Some devices (Texel CD ROM drives) have handshaking problems
860 * when used with the Seagate controllers. borken is initialized
861 * to 1, and then set it to 0 here.
862 */
863 if ((*bflags & BLIST_BORKEN) == 0)
864 sdev->borken = 0;
865
Matthew Wilcox6d877682007-07-11 12:54:55 -0600866 if (*bflags & BLIST_NO_ULD_ATTACH)
867 sdev->no_uld_attach = 1;
868
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 /*
870 * Apparently some really broken devices (contrary to the SCSI
871 * standards) need to be selected without asserting ATN
872 */
873 if (*bflags & BLIST_SELECT_NO_ATN)
874 sdev->select_no_atn = 1;
875
876 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600877 * Maximum 512 sector transfer length
878 * broken RA4x00 Compaq Disk Array
879 */
880 if (*bflags & BLIST_MAX_512)
881 blk_queue_max_sectors(sdev->request_queue, 512);
882
883 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 * Some devices may not want to have a start command automatically
885 * issued when a device is added.
886 */
887 if (*bflags & BLIST_NOSTARTONADD)
888 sdev->no_start_on_add = 1;
889
890 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500891 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 sdev->use_10_for_rw = 1;
894
895 if (*bflags & BLIST_MS_SKIP_PAGE_08)
896 sdev->skip_ms_page_8 = 1;
897
898 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
899 sdev->skip_ms_page_3f = 1;
900
901 if (*bflags & BLIST_USE_10_BYTE_MS)
902 sdev->use_10_for_ms = 1;
903
904 /* set the device running here so that slave configure
905 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500906 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
907 if (ret) {
908 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
909
910 if (ret) {
911 sdev_printk(KERN_ERR, sdev,
912 "in wrong state %s to complete scan\n",
913 scsi_device_state_name(sdev->sdev_state));
914 return SCSI_SCAN_NO_RESPONSE;
915 }
916 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
918 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
919 sdev->use_192_bytes_for_3f = 1;
920
921 if (*bflags & BLIST_NOT_LOCKABLE)
922 sdev->lockable = 0;
923
924 if (*bflags & BLIST_RETRY_HWERROR)
925 sdev->retry_hwerror = 1;
926
927 transport_configure_device(&sdev->sdev_gendev);
928
Christoph Hellwig93805092006-02-17 12:11:29 +0100929 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500930 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100931 if (ret) {
932 /*
933 * if LLDD reports slave not present, don't clutter
934 * console with alloc failure messages
935 */
936 if (ret != -ENXIO) {
937 sdev_printk(KERN_ERR, sdev,
938 "failed to configure device\n");
939 }
940 return SCSI_SCAN_NO_RESPONSE;
941 }
942 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
944 /*
945 * Ok, the device is now all set up, we can
946 * register it and tell the rest of the kernel
947 * about it.
948 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600949 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700950 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951
952 return SCSI_SCAN_LUN_PRESENT;
953}
954
James Bottomley6f3a2022005-09-22 20:33:28 -0500955static inline void scsi_destroy_sdev(struct scsi_device *sdev)
956{
Brian King309bd272006-06-27 11:10:43 -0500957 scsi_device_set_state(sdev, SDEV_DEL);
James Bottomley6f3a2022005-09-22 20:33:28 -0500958 if (sdev->host->hostt->slave_destroy)
959 sdev->host->hostt->slave_destroy(sdev);
960 transport_destroy_device(&sdev->sdev_gendev);
961 put_device(&sdev->sdev_gendev);
962}
963
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700964#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200965/**
Rob Landleyeb448202007-11-03 13:30:39 -0500966 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200967 * @buf: Output buffer with at least end-first+1 bytes of space
968 * @inq: Inquiry buffer (input)
969 * @first: Offset of string into inq
970 * @end: Index after last character in inq
971 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700972static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200973 unsigned first, unsigned end)
974{
975 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700976
977 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
978 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200979 buf[idx] = inq[idx+first];
980 term = idx+1;
981 } else {
982 buf[idx] = ' ';
983 }
984 }
985 buf[term] = 0;
986 return buf;
987}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700988#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500989
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990/**
991 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
992 * @starget: pointer to target device structure
993 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -0500995 * @sdevp: probe the LUN corresponding to this scsi_device
996 * @rescan: if nonzero skip some code only needed on first scan
997 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 *
999 * Description:
1000 * Call scsi_probe_lun, if a LUN with an attached device is found,
1001 * allocate and set it up by calling scsi_add_lun.
1002 *
1003 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001004 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1006 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001007 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 **/
1009static int scsi_probe_and_add_lun(struct scsi_target *starget,
1010 uint lun, int *bflagsp,
1011 struct scsi_device **sdevp, int rescan,
1012 void *hostdata)
1013{
1014 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001016 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1018
1019 /*
1020 * The rescan flag is used as an optimization, the first scan of a
1021 * host adapter calls into here with rescan == 0.
1022 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001023 sdev = scsi_device_lookup_by_target(starget, lun);
1024 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001025 if (rescan || !scsi_device_created(sdev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1027 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001028 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 if (sdevp)
1030 *sdevp = sdev;
1031 else
1032 scsi_device_put(sdev);
1033
1034 if (bflagsp)
1035 *bflagsp = scsi_get_device_flags(sdev,
1036 sdev->vendor,
1037 sdev->model);
1038 return SCSI_SCAN_LUN_PRESENT;
1039 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001040 scsi_device_put(sdev);
1041 } else
1042 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 if (!sdev)
1044 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001045
1046 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001047 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001049 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050
James Bottomley39216032005-06-15 18:48:29 -05001051 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 goto out_free_result;
1053
Kurt Garloff4186ab12006-04-03 15:16:48 +02001054 if (bflagsp)
1055 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 /*
1057 * result contains valid SCSI INQUIRY data.
1058 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001059 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 /*
1061 * For a Peripheral qualifier 3 (011b), the SCSI
1062 * spec says: The device server is not capable of
1063 * supporting a physical device on this logical
1064 * unit.
1065 *
1066 * For disks, this implies that there is no
1067 * logical disk configured at sdev->lun, but there
1068 * is a target id responding.
1069 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001070 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1071 " peripheral qualifier of 3, device not"
1072 " added\n"))
1073 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001074 SCSI_LOG_SCAN_BUS(1, {
1075 unsigned char vend[9];
1076 unsigned char mod[17];
1077
1078 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001079 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001080 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001081 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001082 scsi_inq_str(mod, result, 16, 32));
1083 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001084
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001085 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 res = SCSI_SCAN_TARGET_PRESENT;
1088 goto out_free_result;
1089 }
1090
Alan Stern1bfc5d92006-02-09 15:26:18 -05001091 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001092 * Some targets may set slight variations of PQ and PDT to signal
1093 * that no LUN is present, so don't add sdev in these cases.
1094 * Two specific examples are:
1095 * 1) NetApp targets: return PQ=1, PDT=0x1f
1096 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1097 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1098 *
1099 * References:
1100 * 1) SCSI SPC-3, pp. 145-146
1101 * PQ=1: "A peripheral device having the specified peripheral
1102 * device type is not connected to this logical unit. However, the
1103 * device server is capable of supporting the specified peripheral
1104 * device type on this logical unit."
1105 * PDT=0x1f: "Unknown or no device type"
1106 * 2) USB UFI 1.0, p. 20
1107 * PDT=00h Direct-access device (floppy)
1108 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001109 */
dave wysochanski84961f22006-08-09 14:56:32 -04001110 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001111 (result[0] & 0x1f) == 0x1f &&
1112 !scsi_is_wlun(lun)) {
Alan Stern1bfc5d92006-02-09 15:26:18 -05001113 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1114 "scsi scan: peripheral device type"
1115 " of 31, no device added\n"));
1116 res = SCSI_SCAN_TARGET_PRESENT;
1117 goto out_free_result;
1118 }
1119
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001120 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 if (res == SCSI_SCAN_LUN_PRESENT) {
1122 if (bflags & BLIST_KEY) {
1123 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001124 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 }
1127
1128 out_free_result:
1129 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 out_free_sdev:
1131 if (res == SCSI_SCAN_LUN_PRESENT) {
1132 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001133 if (scsi_device_get(sdev) == 0) {
1134 *sdevp = sdev;
1135 } else {
1136 __scsi_remove_device(sdev);
1137 res = SCSI_SCAN_NO_RESPONSE;
1138 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001140 } else
1141 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 out:
1143 return res;
1144}
1145
1146/**
1147 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1148 * @starget: pointer to target structure to scan
1149 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001150 * @scsi_level: Which version of the standard does this device adhere to
1151 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 *
1153 * Description:
1154 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1155 * scanned) to some maximum lun until a LUN is found with no device
1156 * attached. Use the bflags to figure out any oddities.
1157 *
1158 * Modifies sdevscan->lun.
1159 **/
1160static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001161 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162{
1163 unsigned int sparse_lun, lun, max_dev_lun;
1164 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1165
1166 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
Kay Sievers71610f52008-12-03 22:41:36 +01001167 "%s\n", dev_name(&starget->dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
1169 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1170 /*
1171 * If this device is known to support sparse multiple units,
1172 * override the other settings, and scan all of them. Normally,
1173 * SCSI-3 devices should be scanned via the REPORT LUNS.
1174 */
1175 if (bflags & BLIST_SPARSELUN) {
1176 max_dev_lun = shost->max_lun;
1177 sparse_lun = 1;
1178 } else
1179 sparse_lun = 0;
1180
1181 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 * If less than SCSI_1_CSS, and no special lun scaning, stop
1183 * scanning; this matches 2.4 behaviour, but could just be a bug
1184 * (to continue scanning a SCSI_1_CSS device).
1185 *
1186 * This test is broken. We might not have any device on lun0 for
1187 * a sparselun device, and if that's the case then how would we
1188 * know the real scsi_level, eh? It might make sense to just not
1189 * scan any SCSI_1 device for non-0 luns, but that check would best
1190 * go into scsi_alloc_sdev() and just have it return null when asked
1191 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1192 *
1193 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1194 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1195 == 0))
1196 return;
1197 */
1198 /*
1199 * If this device is known to support multiple units, override
1200 * the other settings, and scan all of them.
1201 */
1202 if (bflags & BLIST_FORCELUN)
1203 max_dev_lun = shost->max_lun;
1204 /*
1205 * REGAL CDC-4X: avoid hang after LUN 4
1206 */
1207 if (bflags & BLIST_MAX5LUN)
1208 max_dev_lun = min(5U, max_dev_lun);
1209 /*
1210 * Do not scan SCSI-2 or lower device past LUN 7, unless
1211 * BLIST_LARGELUN.
1212 */
1213 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1214 max_dev_lun = min(8U, max_dev_lun);
1215
1216 /*
1217 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1218 * until we reach the max, or no LUN is found and we are not
1219 * sparse_lun.
1220 */
1221 for (lun = 1; lun < max_dev_lun; ++lun)
1222 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1223 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1224 !sparse_lun)
1225 return;
1226}
1227
1228/**
1229 * scsilun_to_int: convert a scsi_lun to an int
1230 * @scsilun: struct scsi_lun to be converted.
1231 *
1232 * Description:
1233 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1234 * integer, and return the result. The caller must check for
1235 * truncation before using this function.
1236 *
1237 * Notes:
1238 * The struct scsi_lun is assumed to be four levels, with each level
1239 * effectively containing a SCSI byte-ordered (big endian) short; the
1240 * addressing bits of each level are ignored (the highest two bits).
1241 * For a description of the LUN format, post SCSI-3 see the SCSI
1242 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1243 *
1244 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1245 * the integer: 0x0b030a04
1246 **/
Christof Schmitt462b7852007-06-19 10:25:30 +02001247int scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248{
1249 int i;
1250 unsigned int lun;
1251
1252 lun = 0;
1253 for (i = 0; i < sizeof(lun); i += 2)
1254 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1255 scsilun->scsi_lun[i + 1]) << (i * 8));
1256 return lun;
1257}
Christof Schmitt462b7852007-06-19 10:25:30 +02001258EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259
1260/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001261 * int_to_scsilun: reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001262 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001263 * @scsilun: struct scsi_lun to be set.
1264 *
1265 * Description:
1266 * Reverts the functionality of the scsilun_to_int, which packed
1267 * an 8-byte lun value into an int. This routine unpacks the int
1268 * back into the lun value.
1269 * Note: the scsilun_to_int() routine does not truly handle all
1270 * 8bytes of the lun value. This functions restores only as much
1271 * as was set by the routine.
1272 *
1273 * Notes:
1274 * Given an integer : 0x0b030a04, this function returns a
1275 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1276 *
1277 **/
1278void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1279{
1280 int i;
1281
1282 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1283
1284 for (i = 0; i < sizeof(lun); i += 2) {
1285 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1286 scsilun->scsi_lun[i+1] = lun & 0xFF;
1287 lun = lun >> 16;
1288 }
1289}
1290EXPORT_SYMBOL(int_to_scsilun);
1291
1292/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001294 * @starget: which target
1295 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1296 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 *
1298 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001299 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1300 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 *
Rob Landleyeb448202007-11-03 13:30:39 -05001302 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1303 * LUNs even if it's older than SCSI-3.
1304 * If BLIST_NOREPORTLUN is set, return 1 always.
1305 * If BLIST_NOLUN is set, return 0 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 *
1307 * Return:
1308 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001309 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001311static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 int rescan)
1313{
1314 char devname[64];
1315 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1316 unsigned int length;
1317 unsigned int lun;
1318 unsigned int num_luns;
1319 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001320 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322 u8 *data;
1323 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001324 struct scsi_device *sdev;
1325 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001326 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327
1328 /*
1329 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1330 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1331 * support more than 8 LUNs.
1332 */
James Bottomley4d7db042006-03-31 20:07:45 -06001333 if (bflags & BLIST_NOREPORTLUN)
1334 return 1;
1335 if (starget->scsi_level < SCSI_2 &&
1336 starget->scsi_level != SCSI_UNKNOWN)
1337 return 1;
1338 if (starget->scsi_level < SCSI_3 &&
1339 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 return 1;
1341 if (bflags & BLIST_NOLUN)
1342 return 0;
1343
James Bottomley6f3a2022005-09-22 20:33:28 -05001344 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1345 sdev = scsi_alloc_sdev(starget, 0, NULL);
1346 if (!sdev)
1347 return 0;
1348 if (scsi_device_get(sdev))
1349 return 0;
1350 }
1351
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001353 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354
1355 /*
1356 * Allocate enough to hold the header (the same size as one scsi_lun)
1357 * plus the max number of luns we are requesting.
1358 *
1359 * Reallocating and trying again (with the exact amount we need)
1360 * would be nice, but then we need to somehow limit the size
1361 * allocated based on the available memory and the limits of
1362 * kmalloc - we don't want a kmalloc() failure of a huge value to
1363 * prevent us from finding any LUNs on this target.
1364 */
1365 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1366 lun_data = kmalloc(length, GFP_ATOMIC |
1367 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001368 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001369 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001370 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001371 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372
1373 scsi_cmd[0] = REPORT_LUNS;
1374
1375 /*
1376 * bytes 1 - 5: reserved, set to zero.
1377 */
1378 memset(&scsi_cmd[1], 0, 5);
1379
1380 /*
1381 * bytes 6 - 9: length of the command.
1382 */
1383 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1384 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1385 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1386 scsi_cmd[9] = (unsigned char) length & 0xff;
1387
1388 scsi_cmd[10] = 0; /* reserved */
1389 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390
1391 /*
1392 * We can get a UNIT ATTENTION, for example a power on/reset, so
1393 * retry a few times (like sd.c does for TEST UNIT READY).
1394 * Experience shows some combinations of adapter/devices get at
1395 * least two power on/resets.
1396 *
1397 * Illegal requests (for devices that do not support REPORT LUNS)
1398 * should come through as a check condition, and will not generate
1399 * a retry.
1400 */
1401 for (retries = 0; retries < 3; retries++) {
1402 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1403 " REPORT LUNS to %s (try %d)\n", devname,
1404 retries));
James Bottomley39216032005-06-15 18:48:29 -05001405
James Bottomley39216032005-06-15 18:48:29 -05001406 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001407 lun_data, length, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001408 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001409
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001411 " %s (try %d) result 0x%x\n", result
1412 ? "failed" : "successful", retries, result));
1413 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001415 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 if (sshdr.sense_key != UNIT_ATTENTION)
1417 break;
1418 }
1419 }
1420
James Bottomley39216032005-06-15 18:48:29 -05001421 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 /*
1423 * The device probably does not support a REPORT LUN command
1424 */
Alan Stern2ef89192005-11-08 15:51:55 -05001425 ret = 1;
1426 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
1429 /*
1430 * Get the length from the first four bytes of lun_data.
1431 */
1432 data = (u8 *) lun_data->scsi_lun;
1433 length = ((data[0] << 24) | (data[1] << 16) |
1434 (data[2] << 8) | (data[3] << 0));
1435
1436 num_luns = (length / sizeof(struct scsi_lun));
1437 if (num_luns > max_scsi_report_luns) {
1438 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1439 " of %d luns reported, try increasing"
1440 " max_scsi_report_luns.\n", devname,
1441 max_scsi_report_luns, num_luns);
1442 num_luns = max_scsi_report_luns;
1443 }
1444
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001445 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1446 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
1448 /*
1449 * Scan the luns in lun_data. The entry at offset 0 is really
1450 * the header, so start at 1 and go up to and including num_luns.
1451 */
1452 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1453 lun = scsilun_to_int(lunp);
1454
1455 /*
1456 * Check if the unused part of lunp is non-zero, and so
1457 * does not fit in lun.
1458 */
1459 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1460 int i;
1461
1462 /*
1463 * Output an error displaying the LUN in byte order,
1464 * this differs from what linux would print for the
1465 * integer LUN value.
1466 */
1467 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1468 data = (char *)lunp->scsi_lun;
1469 for (i = 0; i < sizeof(struct scsi_lun); i++)
1470 printk("%02x", data[i]);
1471 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 } else if (lun > sdev->host->max_lun) {
1473 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1474 " than allowed by the host adapter\n",
1475 devname, lun);
1476 } else {
1477 int res;
1478
1479 res = scsi_probe_and_add_lun(starget,
1480 lun, NULL, NULL, rescan, NULL);
1481 if (res == SCSI_SCAN_NO_RESPONSE) {
1482 /*
1483 * Got some results, but now none, abort.
1484 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001485 sdev_printk(KERN_ERR, sdev,
1486 "Unexpected response"
1487 " from lun %d while scanning, scan"
1488 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 break;
1490 }
1491 }
1492 }
1493
Alan Stern2ef89192005-11-08 15:51:55 -05001494 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001497 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001498 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001499 /*
1500 * the sdev we used didn't appear in the report luns scan
1501 */
1502 scsi_destroy_sdev(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001503 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504}
1505
1506struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1507 uint id, uint lun, void *hostdata)
1508{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001509 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001511 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001513 if (strncmp(scsi_scan_type, "none", 4) == 0)
1514 return ERR_PTR(-ENODEV);
1515
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001516 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 if (!starget)
1518 return ERR_PTR(-ENOMEM);
1519
Arjan van de Ven0b950672006-01-11 13:16:10 +01001520 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001521 if (!shost->async_scan)
1522 scsi_complete_async_scans();
1523
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001524 if (scsi_host_scan_allowed(shost))
1525 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001526 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 scsi_target_reap(starget);
1528 put_device(&starget->dev);
1529
1530 return sdev;
1531}
1532EXPORT_SYMBOL(__scsi_add_device);
1533
James Bottomley146f7262005-09-10 12:44:09 -05001534int scsi_add_device(struct Scsi_Host *host, uint channel,
1535 uint target, uint lun)
1536{
1537 struct scsi_device *sdev =
1538 __scsi_add_device(host, channel, target, lun, NULL);
1539 if (IS_ERR(sdev))
1540 return PTR_ERR(sdev);
1541
1542 scsi_device_put(sdev);
1543 return 0;
1544}
1545EXPORT_SYMBOL(scsi_add_device);
1546
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547void scsi_rescan_device(struct device *dev)
1548{
1549 struct scsi_driver *drv;
1550
1551 if (!dev->driver)
1552 return;
1553
1554 drv = to_scsi_driver(dev->driver);
1555 if (try_module_get(drv->owner)) {
1556 if (drv->rescan)
1557 drv->rescan(dev);
1558 module_put(drv->owner);
1559 }
1560}
1561EXPORT_SYMBOL(scsi_rescan_device);
1562
Alan Sterne517d312005-07-26 10:18:45 -04001563static void __scsi_scan_target(struct device *parent, unsigned int channel,
1564 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565{
1566 struct Scsi_Host *shost = dev_to_shost(parent);
1567 int bflags = 0;
1568 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 struct scsi_target *starget;
1570
1571 if (shost->this_id == id)
1572 /*
1573 * Don't scan the host adapter
1574 */
1575 return;
1576
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 if (!starget)
1579 return;
1580
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 if (lun != SCAN_WILD_CARD) {
1582 /*
1583 * Scan for a specific host/chan/id/lun.
1584 */
1585 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1586 goto out_reap;
1587 }
1588
1589 /*
1590 * Scan LUN 0, if there is some response, scan further. Ideally, we
1591 * would not configure LUN 0 until all LUNs are scanned.
1592 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001593 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1594 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1595 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 /*
1597 * The REPORT LUN did not scan the target,
1598 * do a sequential scan.
1599 */
1600 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001601 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603
1604 out_reap:
1605 /* now determine if the target has any children at all
1606 * and if not, nuke it */
1607 scsi_target_reap(starget);
1608
1609 put_device(&starget->dev);
1610}
Alan Sterne517d312005-07-26 10:18:45 -04001611
1612/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001613 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001614 * @parent: host to scan
1615 * @channel: channel to scan
1616 * @id: target id to scan
1617 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1618 * @rescan: passed to LUN scanning routines
1619 *
1620 * Description:
1621 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1622 * and possibly all LUNs on the target id.
1623 *
1624 * First try a REPORT LUN scan, if that does not scan the target, do a
1625 * sequential scan of LUNs on the target id.
1626 **/
1627void scsi_scan_target(struct device *parent, unsigned int channel,
1628 unsigned int id, unsigned int lun, int rescan)
1629{
1630 struct Scsi_Host *shost = dev_to_shost(parent);
1631
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001632 if (strncmp(scsi_scan_type, "none", 4) == 0)
1633 return;
1634
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001635 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001636 if (!shost->async_scan)
1637 scsi_complete_async_scans();
1638
Alan Sterne517d312005-07-26 10:18:45 -04001639 if (scsi_host_scan_allowed(shost))
1640 __scsi_scan_target(parent, channel, id, lun, rescan);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001641 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001642}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643EXPORT_SYMBOL(scsi_scan_target);
1644
1645static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1646 unsigned int id, unsigned int lun, int rescan)
1647{
1648 uint order_id;
1649
1650 if (id == SCAN_WILD_CARD)
1651 for (id = 0; id < shost->max_id; ++id) {
1652 /*
1653 * XXX adapter drivers when possible (FCP, iSCSI)
1654 * could modify max_id to match the current max,
1655 * not the absolute max.
1656 *
1657 * XXX add a shost id iterator, so for example,
1658 * the FC ID can be the same as a target id
1659 * without a huge overhead of sparse id's.
1660 */
1661 if (shost->reverse_ordering)
1662 /*
1663 * Scan from high to low id.
1664 */
1665 order_id = shost->max_id - id - 1;
1666 else
1667 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001668 __scsi_scan_target(&shost->shost_gendev, channel,
1669 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 }
1671 else
Alan Sterne517d312005-07-26 10:18:45 -04001672 __scsi_scan_target(&shost->shost_gendev, channel,
1673 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674}
1675
1676int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1677 unsigned int id, unsigned int lun, int rescan)
1678{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001679 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1680 "%s: <%u:%u:%u>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001681 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682
1683 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001684 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1686 return -EINVAL;
1687
Arjan van de Ven0b950672006-01-11 13:16:10 +01001688 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001689 if (!shost->async_scan)
1690 scsi_complete_async_scans();
1691
Mike Anderson82f29462005-06-16 11:14:33 -07001692 if (scsi_host_scan_allowed(shost)) {
1693 if (channel == SCAN_WILD_CARD)
1694 for (channel = 0; channel <= shost->max_channel;
1695 channel++)
1696 scsi_scan_channel(shost, channel, id, lun,
1697 rescan);
1698 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001700 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001701 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702
1703 return 0;
1704}
1705
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001706static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1707{
1708 struct scsi_device *sdev;
1709 shost_for_each_device(sdev, shost) {
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001710 if (!scsi_host_scan_allowed(shost) ||
1711 scsi_sysfs_add_sdev(sdev) != 0)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001712 scsi_destroy_sdev(sdev);
1713 }
1714}
1715
1716/**
1717 * scsi_prep_async_scan - prepare for an async scan
1718 * @shost: the host which will be scanned
1719 * Returns: a cookie to be passed to scsi_finish_async_scan()
1720 *
1721 * Tells the midlayer this host is going to do an asynchronous scan.
1722 * It reserves the host's position in the scanning list and ensures
1723 * that other asynchronous scans started after this one won't affect the
1724 * ordering of the discovered devices.
1725 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001726static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001727{
1728 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001729 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001730
1731 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1732 return NULL;
1733
1734 if (shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001735 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001736 shost->host_no);
1737 dump_stack();
1738 return NULL;
1739 }
1740
1741 data = kmalloc(sizeof(*data), GFP_KERNEL);
1742 if (!data)
1743 goto err;
1744 data->shost = scsi_host_get(shost);
1745 if (!data->shost)
1746 goto err;
1747 init_completion(&data->prev_finished);
1748
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001749 mutex_lock(&shost->scan_mutex);
1750 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001751 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001752 spin_unlock_irqrestore(shost->host_lock, flags);
1753 mutex_unlock(&shost->scan_mutex);
1754
1755 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001756 if (list_empty(&scanning_hosts))
1757 complete(&data->prev_finished);
1758 list_add_tail(&data->list, &scanning_hosts);
1759 spin_unlock(&async_scan_lock);
1760
1761 return data;
1762
1763 err:
1764 kfree(data);
1765 return NULL;
1766}
1767
1768/**
1769 * scsi_finish_async_scan - asynchronous scan has finished
1770 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1771 *
1772 * All the devices currently attached to this host have been found.
1773 * This function announces all the devices it has found to the rest
1774 * of the system.
1775 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001776static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001777{
1778 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001779 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001780
1781 if (!data)
1782 return;
1783
1784 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001785
1786 mutex_lock(&shost->scan_mutex);
1787
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001788 if (!shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001789 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001790 shost->host_no);
1791 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001792 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001793 return;
1794 }
1795
1796 wait_for_completion(&data->prev_finished);
1797
1798 scsi_sysfs_add_devices(shost);
1799
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001800 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001801 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001802 spin_unlock_irqrestore(shost->host_lock, flags);
1803
1804 mutex_unlock(&shost->scan_mutex);
1805
1806 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001807 list_del(&data->list);
1808 if (!list_empty(&scanning_hosts)) {
1809 struct async_scan_data *next = list_entry(scanning_hosts.next,
1810 struct async_scan_data, list);
1811 complete(&next->prev_finished);
1812 }
1813 spin_unlock(&async_scan_lock);
1814
1815 scsi_host_put(shost);
1816 kfree(data);
1817}
1818
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001819static void do_scsi_scan_host(struct Scsi_Host *shost)
1820{
1821 if (shost->hostt->scan_finished) {
1822 unsigned long start = jiffies;
1823 if (shost->hostt->scan_start)
1824 shost->hostt->scan_start(shost);
1825
1826 while (!shost->hostt->scan_finished(shost, jiffies - start))
1827 msleep(10);
1828 } else {
1829 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1830 SCAN_WILD_CARD, 0);
1831 }
1832}
1833
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001834static int do_scan_async(void *_data)
1835{
1836 struct async_scan_data *data = _data;
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001837 do_scsi_scan_host(data->shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001838 scsi_finish_async_scan(data);
1839 return 0;
1840}
1841
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842/**
1843 * scsi_scan_host - scan the given adapter
1844 * @shost: adapter to scan
1845 **/
1846void scsi_scan_host(struct Scsi_Host *shost)
1847{
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001848 struct task_struct *p;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001849 struct async_scan_data *data;
1850
1851 if (strncmp(scsi_scan_type, "none", 4) == 0)
1852 return;
1853
1854 data = scsi_prep_async_scan(shost);
1855 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001856 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001857 return;
1858 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001859
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001860 p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001861 if (IS_ERR(p))
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001862 do_scan_async(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863}
1864EXPORT_SYMBOL(scsi_scan_host);
1865
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866void scsi_forget_host(struct Scsi_Host *shost)
1867{
Alan Sterna64358d2005-07-26 10:27:10 -04001868 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001869 unsigned long flags;
1870
Alan Sterna64358d2005-07-26 10:27:10 -04001871 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001873 list_for_each_entry(sdev, &shost->__devices, siblings) {
1874 if (sdev->sdev_state == SDEV_DEL)
1875 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001877 __scsi_remove_device(sdev);
1878 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 }
1880 spin_unlock_irqrestore(shost->host_lock, flags);
1881}
1882
1883/*
1884 * Function: scsi_get_host_dev()
1885 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001886 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001888 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 *
1890 * Lock status: None assumed.
1891 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001892 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 *
1894 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001895 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 * be made to look like a "pseudo-device" that points to the
1897 * HA itself.
1898 *
1899 * Note - this device is not accessible from any high-level
1900 * drivers (including generics), which is probably not
1901 * optimal. We can add hooks later to attach
1902 */
1903struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1904{
Alan Sterne517d312005-07-26 10:18:45 -04001905 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 struct scsi_target *starget;
1907
Arjan van de Ven0b950672006-01-11 13:16:10 +01001908 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001909 if (!scsi_host_scan_allowed(shost))
1910 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1912 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001913 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914
1915 sdev = scsi_alloc_sdev(starget, 0, NULL);
1916 if (sdev) {
1917 sdev->sdev_gendev.parent = get_device(&starget->dev);
1918 sdev->borken = 0;
James Bottomley884d25c2006-09-05 16:26:41 -05001919 } else
1920 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001922 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001923 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 return sdev;
1925}
1926EXPORT_SYMBOL(scsi_get_host_dev);
1927
1928/*
1929 * Function: scsi_free_host_dev()
1930 *
1931 * Purpose: Free a scsi_device that points to the host adapter itself.
1932 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001933 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934 *
1935 * Lock status: None assumed.
1936 *
1937 * Returns: Nothing
1938 *
1939 * Notes:
1940 */
1941void scsi_free_host_dev(struct scsi_device *sdev)
1942{
1943 BUG_ON(sdev->id != sdev->host->this_id);
1944
James Bottomley6f3a2022005-09-22 20:33:28 -05001945 scsi_destroy_sdev(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946}
1947EXPORT_SYMBOL(scsi_free_host_dev);
1948