blob: 012f73a96880e8b67546caeab4211c0a8c65f523 [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
Alan Stern14faf122009-03-12 11:08:51 -0400118static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
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."
Alan Stern14faf122009-03-12 11:08:51 -0400123 " Default is 20. Some devices may need more; most need less.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
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);
183 return 0;
184}
185
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600186/* Only exported for the benefit of scsi_wait_scan */
187EXPORT_SYMBOL_GPL(scsi_complete_async_scans);
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600188
Hugh Dickinsf2f027c2007-05-23 14:41:42 -0700189#ifndef MODULE
190/*
191 * For async scanning we need to wait for all the scans to complete before
192 * trying to mount the root fs. Otherwise non-modular drivers may not be ready
193 * yet.
194 */
195late_initcall(scsi_complete_async_scans);
196#endif
197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198/**
199 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500200 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 * @result: area to store the result of the MODE SENSE
202 *
203 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500204 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 * Called for BLIST_KEY devices.
206 **/
James Bottomley39216032005-06-15 18:48:29 -0500207static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 unsigned char *result)
209{
210 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
211
212 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
213 scsi_cmd[0] = MODE_SENSE;
214 scsi_cmd[1] = 0;
215 scsi_cmd[2] = 0x2e;
216 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500217 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500219 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900220 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
223/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500225 * @starget: which target to allocate a &scsi_device for
226 * @lun: which lun
227 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 *
229 * Description:
230 * Allocate, initialize for io, and return a pointer to a scsi_Device.
231 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
232 * adds scsi_Device to the appropriate list.
233 *
234 * Return value:
235 * scsi_Device pointer, or NULL on failure.
236 **/
237static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
238 unsigned int lun, void *hostdata)
239{
240 struct scsi_device *sdev;
241 int display_failure_msg = 1, ret;
242 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400243 extern void scsi_evt_thread(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Jes Sorensen24669f752006-01-16 10:31:18 -0500245 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 GFP_ATOMIC);
247 if (!sdev)
248 goto out;
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 sdev->vendor = scsi_null_device_strs;
251 sdev->model = scsi_null_device_strs;
252 sdev->rev = scsi_null_device_strs;
253 sdev->host = shost;
Vasu Dev4a840672009-10-22 15:46:33 -0700254 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 sdev->id = starget->id;
256 sdev->lun = lun;
257 sdev->channel = starget->channel;
258 sdev->sdev_state = SDEV_CREATED;
259 INIT_LIST_HEAD(&sdev->siblings);
260 INIT_LIST_HEAD(&sdev->same_target_siblings);
261 INIT_LIST_HEAD(&sdev->cmd_list);
262 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400263 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400265 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267 sdev->sdev_gendev.parent = get_device(&starget->dev);
268 sdev->sdev_target = starget;
269
270 /* usually NULL and set by ->slave_alloc instead */
271 sdev->hostdata = hostdata;
272
273 /* if the device needs this changing, it may do so in the
274 * slave_configure function */
275 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
276
277 /*
278 * Some low level driver could use device->type
279 */
280 sdev->type = -1;
281
282 /*
283 * Assume that the device will have handshaking problems,
284 * and then fix this field later if it turns out it
285 * doesn't
286 */
287 sdev->borken = 1;
288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 sdev->request_queue = scsi_alloc_queue(sdev);
290 if (!sdev->request_queue) {
291 /* release fn is set up in scsi_sysfs_device_initialise, so
292 * have to free and put manually here */
293 put_device(&starget->dev);
Dave Jones93f56082006-03-09 10:21:27 -0500294 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 goto out;
296 }
297
298 sdev->request_queue->queuedata = sdev;
299 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
300
301 scsi_sysfs_device_initialize(sdev);
302
303 if (shost->hostt->slave_alloc) {
304 ret = shost->hostt->slave_alloc(sdev);
305 if (ret) {
306 /*
307 * if LLDD reports slave not present, don't clutter
308 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 */
310 if (ret == -ENXIO)
311 display_failure_msg = 0;
312 goto out_device_destroy;
313 }
314 }
315
316 return sdev;
317
318out_device_destroy:
James Smartc2f9e492009-01-27 11:41:36 -0500319 scsi_device_set_state(sdev, SDEV_DEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 transport_destroy_device(&sdev->sdev_gendev);
James Bottomley37e6ba02009-10-02 13:30:08 -0500321 put_device(&sdev->sdev_dev);
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;
Edward Gogginc53a2842009-04-09 10:02:22 -0700430 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
James Bottomleyffedb452006-02-23 14:27:18 -0600431 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 spin_lock_irqsave(shost->host_lock, flags);
433
434 found_target = __scsi_find_target(parent, channel, id);
435 if (found_target)
436 goto found;
437
438 list_add_tail(&starget->siblings, &shost->__targets);
439 spin_unlock_irqrestore(shost->host_lock, flags);
440 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500441 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500442 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600443 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500444
445 if(error) {
446 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
447 /* don't want scsi_target_reap to do the final
448 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500449 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500450 return NULL;
451 }
452 }
James Bottomley884d25c2006-09-05 16:26:41 -0500453 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500454
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 return starget;
456
457 found:
458 found_target->reap_ref++;
459 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600460 if (found_target->state != STARGET_DEL) {
James Bottomley884d25c2006-09-05 16:26:41 -0500461 put_device(parent);
James Bottomleyffedb452006-02-23 14:27:18 -0600462 kfree(starget);
463 return found_target;
464 }
465 /* Unfortunately, we found a dying target; need to
466 * wait until it's dead before we can get a new one */
467 put_device(&found_target->dev);
468 flush_scheduled_work();
469 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470}
471
David Howells65f27f32006-11-22 14:55:48 +0000472static void scsi_target_reap_usercontext(struct work_struct *work)
James Bottomley65110b22006-02-14 10:48:46 -0600473{
David Howells65f27f32006-11-22 14:55:48 +0000474 struct scsi_target *starget =
475 container_of(work, struct scsi_target, ew.work);
James Bottomley863a9302005-12-15 20:01:43 -0800476
James Bottomleyffedb452006-02-23 14:27:18 -0600477 transport_remove_device(&starget->dev);
478 device_del(&starget->dev);
James Bottomley643eb2d2008-03-22 22:42:27 -0500479 scsi_target_destroy(starget);
James Bottomley863a9302005-12-15 20:01:43 -0800480}
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482/**
483 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 * @starget: target to be checked
485 *
486 * This is used after removing a LUN or doing a last put of the target
487 * it checks atomically that nothing is using the target and removes
488 * it if so.
489 */
490void scsi_target_reap(struct scsi_target *starget)
491{
James Bottomleyffedb452006-02-23 14:27:18 -0600492 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
493 unsigned long flags;
James Bottomley643eb2d2008-03-22 22:42:27 -0500494 enum scsi_target_state state;
495 int empty;
James Bottomleyffedb452006-02-23 14:27:18 -0600496
497 spin_lock_irqsave(shost->host_lock, flags);
James Bottomley643eb2d2008-03-22 22:42:27 -0500498 state = starget->state;
499 empty = --starget->reap_ref == 0 &&
500 list_empty(&starget->devices) ? 1 : 0;
James Bottomleyffedb452006-02-23 14:27:18 -0600501 spin_unlock_irqrestore(shost->host_lock, flags);
502
James Bottomley643eb2d2008-03-22 22:42:27 -0500503 if (!empty)
504 return;
505
506 BUG_ON(state == STARGET_DEL);
507 starget->state = STARGET_DEL;
508 if (state == STARGET_CREATED)
509 scsi_target_destroy(starget);
510 else
511 execute_in_process_context(scsi_target_reap_usercontext,
512 &starget->ew);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513}
514
515/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400516 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
517 * @s: INQUIRY result string to sanitize
518 * @len: length of the string
519 *
520 * Description:
521 * The SCSI spec says that INQUIRY vendor, product, and revision
522 * strings must consist entirely of graphic ASCII characters,
523 * padded on the right with spaces. Since not all devices obey
524 * this rule, we will replace non-graphic or non-ASCII characters
525 * with spaces. Exception: a NUL character is interpreted as a
526 * string terminator, so all the following characters are set to
527 * spaces.
528 **/
529static void sanitize_inquiry_string(unsigned char *s, int len)
530{
531 int terminated = 0;
532
533 for (; len > 0; (--len, ++s)) {
534 if (*s == 0)
535 terminated = 1;
536 if (terminated || *s < 0x20 || *s > 0x7e)
537 *s = ' ';
538 }
539}
540
541/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500543 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500545 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 * @bflags: store any bflags found here
547 *
548 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500549 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 *
James Bottomley39216032005-06-15 18:48:29 -0500551 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100553 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400555static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500556 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
559 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
560 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500561 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 struct scsi_sense_hdr sshdr;
563
564 *bflags = 0;
565
566 /* Perform up to 3 passes. The first pass uses a conservative
567 * transfer length of 36 unless sdev->inquiry_len specifies a
568 * different value. */
569 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
570 try_inquiry_len = first_inquiry_len;
571 pass = 1;
572
573 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500574 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
575 "scsi scan: INQUIRY pass %d length %d\n",
576 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577
578 /* Each pass gets up to three chances to ignore Unit Attention */
579 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900580 int resid;
581
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 memset(scsi_cmd, 0, 6);
583 scsi_cmd[0] = INQUIRY;
584 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
586 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500587
588 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500589 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900590 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900591 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
593 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
594 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500595 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
James Bottomley39216032005-06-15 18:48:29 -0500597 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 /*
599 * not-ready to ready transition [asc/ascq=0x28/0x0]
600 * or power-on, reset [asc/ascq=0x29/0x0], continue.
601 * INQUIRY should not yield UNIT_ATTENTION
602 * but many buggy devices do so anyway.
603 */
James Bottomley39216032005-06-15 18:48:29 -0500604 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500605 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 if ((sshdr.sense_key == UNIT_ATTENTION) &&
607 ((sshdr.asc == 0x28) ||
608 (sshdr.asc == 0x29)) &&
609 (sshdr.ascq == 0))
610 continue;
611 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900612 } else {
613 /*
614 * if nothing was transferred, we try
615 * again. It's a workaround for some USB
616 * devices.
617 */
618 if (resid == try_inquiry_len)
619 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 }
621 break;
622 }
623
James Bottomley39216032005-06-15 18:48:29 -0500624 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400625 sanitize_inquiry_string(&inq_result[8], 8);
626 sanitize_inquiry_string(&inq_result[16], 16);
627 sanitize_inquiry_string(&inq_result[32], 4);
628
629 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 if (response_len > 255)
631 response_len = first_inquiry_len; /* sanity */
632
633 /*
634 * Get any flags for this device.
635 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100636 * XXX add a bflags to scsi_device, and replace the
637 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 * need not be passed as an argument.
639 */
640 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
641 &inq_result[16]);
642
643 /* When the first pass succeeds we gain information about
644 * what larger transfer lengths might work. */
645 if (pass == 1) {
646 if (BLIST_INQUIRY_36 & *bflags)
647 next_inquiry_len = 36;
648 else if (BLIST_INQUIRY_58 & *bflags)
649 next_inquiry_len = 58;
650 else if (sdev->inquiry_len)
651 next_inquiry_len = sdev->inquiry_len;
652 else
653 next_inquiry_len = response_len;
654
655 /* If more data is available perform the second pass */
656 if (next_inquiry_len > try_inquiry_len) {
657 try_inquiry_len = next_inquiry_len;
658 pass = 2;
659 goto next_pass;
660 }
661 }
662
663 } else if (pass == 2) {
664 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
665 "Consider BLIST_INQUIRY_36 for this device\n",
666 try_inquiry_len);
667
668 /* If this pass failed, the third pass goes back and transfers
669 * the same amount as we successfully got in the first pass. */
670 try_inquiry_len = first_inquiry_len;
671 pass = 3;
672 goto next_pass;
673 }
674
675 /* If the last transfer attempt got an error, assume the
676 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500677 if (result)
678 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
680 /* Don't report any more data than the device says is valid */
681 sdev->inquiry_len = min(try_inquiry_len, response_len);
682
683 /*
684 * XXX Abort if the response length is less than 36? If less than
685 * 32, the lookup of the device flags (above) could be invalid,
686 * and it would be possible to take an incorrect action - we do
687 * not want to hang because of a short INQUIRY. On the flip side,
688 * if the device is spun down or becoming ready (and so it gives a
689 * short INQUIRY), an abort here prevents any further use of the
690 * device, including spin up.
691 *
Alan Sterne423ee32007-02-16 01:46:38 -0800692 * On the whole, the best approach seems to be to assume the first
693 * 36 bytes are valid no matter what the device says. That's
694 * better than copying < 36 bytes to the inquiry-result buffer
695 * and displaying garbage for the Vendor, Product, or Revision
696 * strings.
697 */
698 if (sdev->inquiry_len < 36) {
699 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
700 " using 36\n", sdev->inquiry_len);
701 sdev->inquiry_len = 36;
702 }
703
704 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 * Related to the above issue:
706 *
707 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
708 * and if not ready, sent a START_STOP to start (maybe spin up) and
709 * then send the INQUIRY again, since the INQUIRY can change after
710 * a device is initialized.
711 *
712 * Ideally, start a device if explicitly asked to do so. This
713 * assumes that a device is spun up on power on, spun down on
714 * request, and then spun up on request.
715 */
716
717 /*
718 * The scanning code needs to know the scsi_level, even if no
719 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
720 * non-zero LUNs can be scanned.
721 */
722 sdev->scsi_level = inq_result[2] & 0x07;
723 if (sdev->scsi_level >= 2 ||
724 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
725 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500726 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
James Bottomley39216032005-06-15 18:48:29 -0500728 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729}
730
731/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100732 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600733 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 * @inq_result: holds the result of a previous INQUIRY to the LUN
735 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600736 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 *
738 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600739 * Initialize the scsi_device @sdev. Optionally set fields based
740 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 *
742 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100743 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
744 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400746static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600747 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748{
James Bottomley6f4267e2008-08-22 16:53:31 -0500749 int ret;
750
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 /*
752 * XXX do not save the inquiry, since it can change underneath us,
753 * save just vendor/model/rev.
754 *
755 * Rather than save it and have an ioctl that retrieves the saved
756 * value, have an ioctl that executes the same INQUIRY code used
757 * in scsi_probe_lun, let user level programs doing INQUIRY
758 * scanning run at their own risk, or supply a user level program
759 * that can correctly scan.
760 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
Alan Stern09123d22006-11-10 12:27:57 -0800762 /*
763 * Copy at least 36 bytes of INQUIRY data, so that we don't
764 * dereference unallocated memory when accessing the Vendor,
765 * Product, and Revision strings. Badly behaved devices may set
766 * the INQUIRY Additional Length byte to a small value, indicating
767 * these strings are invalid, but often they contain plausible data
768 * nonetheless. It doesn't matter if the device sent < 36 bytes
769 * total, since scsi_probe_lun() initializes inq_result with 0s.
770 */
771 sdev->inquiry = kmemdup(inq_result,
772 max_t(size_t, sdev->inquiry_len, 36),
773 GFP_ATOMIC);
774 if (sdev->inquiry == NULL)
775 return SCSI_SCAN_NO_RESPONSE;
776
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 sdev->vendor = (char *) (sdev->inquiry + 8);
778 sdev->model = (char *) (sdev->inquiry + 16);
779 sdev->rev = (char *) (sdev->inquiry + 32);
780
781 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600782 sdev->type = TYPE_ROM;
783 sdev->removable = 1;
784 } else {
785 sdev->type = (inq_result[0] & 0x1f);
786 sdev->removable = (inq_result[1] & 0x80) >> 7;
787 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Matthew Wilcox6d877682007-07-11 12:54:55 -0600789 switch (sdev->type) {
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600790 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 case TYPE_TAPE:
792 case TYPE_DISK:
793 case TYPE_PRINTER:
794 case TYPE_MOD:
795 case TYPE_PROCESSOR:
796 case TYPE_SCANNER:
797 case TYPE_MEDIUM_CHANGER:
798 case TYPE_ENCLOSURE:
799 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600800 case TYPE_RAID:
Boaz Harrosh82443a52009-01-25 16:51:33 +0200801 case TYPE_OSD:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 sdev->writeable = 1;
803 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 case TYPE_ROM:
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600805 case TYPE_WORM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 sdev->writeable = 0;
807 break;
808 default:
809 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
810 }
811
Matthew Wilcox6d877682007-07-11 12:54:55 -0600812 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
813 /* RBC and MMC devices can return SCSI-3 compliance and yet
814 * still not support REPORT LUNS, so make them act as
815 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
816 * specifically set */
817 if ((*bflags & BLIST_REPORTLUN2) == 0)
818 *bflags |= BLIST_NOREPORTLUN;
819 }
820
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 /*
822 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
823 * spec says: The device server is capable of supporting the
824 * specified peripheral device type on this logical unit. However,
825 * the physical device is not currently connected to this logical
826 * unit.
827 *
828 * The above is vague, as it implies that we could treat 001 and
829 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100830 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 *
832 * Don't set the device offline here; rather let the upper
833 * level drivers eval the PQ to decide whether they should
834 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
835 */
836
837 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 sdev->lockable = sdev->removable;
839 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
840
Matthew Wilcox6d877682007-07-11 12:54:55 -0600841 if (sdev->scsi_level >= SCSI_3 ||
842 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 sdev->ppr = 1;
844 if (inq_result[7] & 0x60)
845 sdev->wdtr = 1;
846 if (inq_result[7] & 0x10)
847 sdev->sdtr = 1;
848
James Bottomley19ac0db2006-08-06 18:15:22 -0500849 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600850 "ANSI: %d%s\n", scsi_device_type(sdev->type),
851 sdev->vendor, sdev->model, sdev->rev,
852 sdev->inq_periph_qual, inq_result[2] & 0x07,
853 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
856 !(*bflags & BLIST_NOTQ))
857 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600858
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 /*
860 * Some devices (Texel CD ROM drives) have handshaking problems
861 * when used with the Seagate controllers. borken is initialized
862 * to 1, and then set it to 0 here.
863 */
864 if ((*bflags & BLIST_BORKEN) == 0)
865 sdev->borken = 0;
866
Matthew Wilcox6d877682007-07-11 12:54:55 -0600867 if (*bflags & BLIST_NO_ULD_ATTACH)
868 sdev->no_uld_attach = 1;
869
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 /*
871 * Apparently some really broken devices (contrary to the SCSI
872 * standards) need to be selected without asserting ATN
873 */
874 if (*bflags & BLIST_SELECT_NO_ATN)
875 sdev->select_no_atn = 1;
876
877 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600878 * Maximum 512 sector transfer length
879 * broken RA4x00 Compaq Disk Array
880 */
881 if (*bflags & BLIST_MAX_512)
882 blk_queue_max_sectors(sdev->request_queue, 512);
883
884 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 * Some devices may not want to have a start command automatically
886 * issued when a device is added.
887 */
888 if (*bflags & BLIST_NOSTARTONADD)
889 sdev->no_start_on_add = 1;
890
891 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500892 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 sdev->use_10_for_rw = 1;
895
896 if (*bflags & BLIST_MS_SKIP_PAGE_08)
897 sdev->skip_ms_page_8 = 1;
898
899 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
900 sdev->skip_ms_page_3f = 1;
901
902 if (*bflags & BLIST_USE_10_BYTE_MS)
903 sdev->use_10_for_ms = 1;
904
905 /* set the device running here so that slave configure
906 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500907 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
908 if (ret) {
909 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
910
911 if (ret) {
912 sdev_printk(KERN_ERR, sdev,
913 "in wrong state %s to complete scan\n",
914 scsi_device_state_name(sdev->sdev_state));
915 return SCSI_SCAN_NO_RESPONSE;
916 }
917 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918
919 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
920 sdev->use_192_bytes_for_3f = 1;
921
922 if (*bflags & BLIST_NOT_LOCKABLE)
923 sdev->lockable = 0;
924
925 if (*bflags & BLIST_RETRY_HWERROR)
926 sdev->retry_hwerror = 1;
927
928 transport_configure_device(&sdev->sdev_gendev);
929
Christoph Hellwig93805092006-02-17 12:11:29 +0100930 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500931 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100932 if (ret) {
933 /*
934 * if LLDD reports slave not present, don't clutter
935 * console with alloc failure messages
936 */
937 if (ret != -ENXIO) {
938 sdev_printk(KERN_ERR, sdev,
939 "failed to configure device\n");
940 }
941 return SCSI_SCAN_NO_RESPONSE;
942 }
943 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944
Vasu Dev4a840672009-10-22 15:46:33 -0700945 sdev->max_queue_depth = sdev->queue_depth;
946
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 /*
948 * Ok, the device is now all set up, we can
949 * register it and tell the rest of the kernel
950 * about it.
951 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600952 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700953 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
955 return SCSI_SCAN_LUN_PRESENT;
956}
957
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700958#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200959/**
Rob Landleyeb448202007-11-03 13:30:39 -0500960 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200961 * @buf: Output buffer with at least end-first+1 bytes of space
962 * @inq: Inquiry buffer (input)
963 * @first: Offset of string into inq
964 * @end: Index after last character in inq
965 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700966static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200967 unsigned first, unsigned end)
968{
969 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700970
971 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
972 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200973 buf[idx] = inq[idx+first];
974 term = idx+1;
975 } else {
976 buf[idx] = ' ';
977 }
978 }
979 buf[term] = 0;
980 return buf;
981}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700982#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984/**
985 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
986 * @starget: pointer to target device structure
987 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -0500989 * @sdevp: probe the LUN corresponding to this scsi_device
990 * @rescan: if nonzero skip some code only needed on first scan
991 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 *
993 * Description:
994 * Call scsi_probe_lun, if a LUN with an attached device is found,
995 * allocate and set it up by calling scsi_add_lun.
996 *
997 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100998 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1000 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001001 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 **/
1003static int scsi_probe_and_add_lun(struct scsi_target *starget,
1004 uint lun, int *bflagsp,
1005 struct scsi_device **sdevp, int rescan,
1006 void *hostdata)
1007{
1008 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001010 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1012
1013 /*
1014 * The rescan flag is used as an optimization, the first scan of a
1015 * host adapter calls into here with rescan == 0.
1016 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001017 sdev = scsi_device_lookup_by_target(starget, lun);
1018 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001019 if (rescan || !scsi_device_created(sdev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1021 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001022 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 if (sdevp)
1024 *sdevp = sdev;
1025 else
1026 scsi_device_put(sdev);
1027
1028 if (bflagsp)
1029 *bflagsp = scsi_get_device_flags(sdev,
1030 sdev->vendor,
1031 sdev->model);
1032 return SCSI_SCAN_LUN_PRESENT;
1033 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001034 scsi_device_put(sdev);
1035 } else
1036 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 if (!sdev)
1038 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001039
1040 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001041 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001043 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
James Bottomley39216032005-06-15 18:48:29 -05001045 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 goto out_free_result;
1047
Kurt Garloff4186ab12006-04-03 15:16:48 +02001048 if (bflagsp)
1049 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 /*
1051 * result contains valid SCSI INQUIRY data.
1052 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001053 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 /*
1055 * For a Peripheral qualifier 3 (011b), the SCSI
1056 * spec says: The device server is not capable of
1057 * supporting a physical device on this logical
1058 * unit.
1059 *
1060 * For disks, this implies that there is no
1061 * logical disk configured at sdev->lun, but there
1062 * is a target id responding.
1063 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001064 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1065 " peripheral qualifier of 3, device not"
1066 " added\n"))
1067 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001068 SCSI_LOG_SCAN_BUS(1, {
1069 unsigned char vend[9];
1070 unsigned char mod[17];
1071
1072 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001073 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001074 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001075 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001076 scsi_inq_str(mod, result, 16, 32));
1077 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001078
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001079 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001080
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 res = SCSI_SCAN_TARGET_PRESENT;
1082 goto out_free_result;
1083 }
1084
Alan Stern1bfc5d92006-02-09 15:26:18 -05001085 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001086 * Some targets may set slight variations of PQ and PDT to signal
1087 * that no LUN is present, so don't add sdev in these cases.
1088 * Two specific examples are:
1089 * 1) NetApp targets: return PQ=1, PDT=0x1f
1090 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1091 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1092 *
1093 * References:
1094 * 1) SCSI SPC-3, pp. 145-146
1095 * PQ=1: "A peripheral device having the specified peripheral
1096 * device type is not connected to this logical unit. However, the
1097 * device server is capable of supporting the specified peripheral
1098 * device type on this logical unit."
1099 * PDT=0x1f: "Unknown or no device type"
1100 * 2) USB UFI 1.0, p. 20
1101 * PDT=00h Direct-access device (floppy)
1102 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001103 */
dave wysochanski84961f22006-08-09 14:56:32 -04001104 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001105 (result[0] & 0x1f) == 0x1f &&
1106 !scsi_is_wlun(lun)) {
Alan Stern1bfc5d92006-02-09 15:26:18 -05001107 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1108 "scsi scan: peripheral device type"
1109 " of 31, no device added\n"));
1110 res = SCSI_SCAN_TARGET_PRESENT;
1111 goto out_free_result;
1112 }
1113
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001114 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 if (res == SCSI_SCAN_LUN_PRESENT) {
1116 if (bflags & BLIST_KEY) {
1117 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001118 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 }
1121
1122 out_free_result:
1123 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 out_free_sdev:
1125 if (res == SCSI_SCAN_LUN_PRESENT) {
1126 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001127 if (scsi_device_get(sdev) == 0) {
1128 *sdevp = sdev;
1129 } else {
1130 __scsi_remove_device(sdev);
1131 res = SCSI_SCAN_NO_RESPONSE;
1132 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001134 } else
James Bottomley860dc732009-11-19 17:48:29 -05001135 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 out:
1137 return res;
1138}
1139
1140/**
1141 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1142 * @starget: pointer to target structure to scan
1143 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001144 * @scsi_level: Which version of the standard does this device adhere to
1145 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 *
1147 * Description:
1148 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1149 * scanned) to some maximum lun until a LUN is found with no device
1150 * attached. Use the bflags to figure out any oddities.
1151 *
1152 * Modifies sdevscan->lun.
1153 **/
1154static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001155 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156{
1157 unsigned int sparse_lun, lun, max_dev_lun;
1158 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1159
1160 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
Kay Sievers71610f52008-12-03 22:41:36 +01001161 "%s\n", dev_name(&starget->dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
1163 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1164 /*
1165 * If this device is known to support sparse multiple units,
1166 * override the other settings, and scan all of them. Normally,
1167 * SCSI-3 devices should be scanned via the REPORT LUNS.
1168 */
1169 if (bflags & BLIST_SPARSELUN) {
1170 max_dev_lun = shost->max_lun;
1171 sparse_lun = 1;
1172 } else
1173 sparse_lun = 0;
1174
1175 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 * If less than SCSI_1_CSS, and no special lun scaning, stop
1177 * scanning; this matches 2.4 behaviour, but could just be a bug
1178 * (to continue scanning a SCSI_1_CSS device).
1179 *
1180 * This test is broken. We might not have any device on lun0 for
1181 * a sparselun device, and if that's the case then how would we
1182 * know the real scsi_level, eh? It might make sense to just not
1183 * scan any SCSI_1 device for non-0 luns, but that check would best
1184 * go into scsi_alloc_sdev() and just have it return null when asked
1185 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1186 *
1187 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1188 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1189 == 0))
1190 return;
1191 */
1192 /*
1193 * If this device is known to support multiple units, override
1194 * the other settings, and scan all of them.
1195 */
1196 if (bflags & BLIST_FORCELUN)
1197 max_dev_lun = shost->max_lun;
1198 /*
1199 * REGAL CDC-4X: avoid hang after LUN 4
1200 */
1201 if (bflags & BLIST_MAX5LUN)
1202 max_dev_lun = min(5U, max_dev_lun);
1203 /*
1204 * Do not scan SCSI-2 or lower device past LUN 7, unless
1205 * BLIST_LARGELUN.
1206 */
1207 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1208 max_dev_lun = min(8U, max_dev_lun);
1209
1210 /*
1211 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1212 * until we reach the max, or no LUN is found and we are not
1213 * sparse_lun.
1214 */
1215 for (lun = 1; lun < max_dev_lun; ++lun)
1216 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1217 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1218 !sparse_lun)
1219 return;
1220}
1221
1222/**
1223 * scsilun_to_int: convert a scsi_lun to an int
1224 * @scsilun: struct scsi_lun to be converted.
1225 *
1226 * Description:
1227 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1228 * integer, and return the result. The caller must check for
1229 * truncation before using this function.
1230 *
1231 * Notes:
1232 * The struct scsi_lun is assumed to be four levels, with each level
1233 * effectively containing a SCSI byte-ordered (big endian) short; the
1234 * addressing bits of each level are ignored (the highest two bits).
1235 * For a description of the LUN format, post SCSI-3 see the SCSI
1236 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1237 *
1238 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1239 * the integer: 0x0b030a04
1240 **/
Christof Schmitt462b7852007-06-19 10:25:30 +02001241int scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242{
1243 int i;
1244 unsigned int lun;
1245
1246 lun = 0;
1247 for (i = 0; i < sizeof(lun); i += 2)
1248 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1249 scsilun->scsi_lun[i + 1]) << (i * 8));
1250 return lun;
1251}
Christof Schmitt462b7852007-06-19 10:25:30 +02001252EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253
1254/**
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001255 * int_to_scsilun: reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001256 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001257 * @scsilun: struct scsi_lun to be set.
1258 *
1259 * Description:
1260 * Reverts the functionality of the scsilun_to_int, which packed
1261 * an 8-byte lun value into an int. This routine unpacks the int
1262 * back into the lun value.
1263 * Note: the scsilun_to_int() routine does not truly handle all
1264 * 8bytes of the lun value. This functions restores only as much
1265 * as was set by the routine.
1266 *
1267 * Notes:
1268 * Given an integer : 0x0b030a04, this function returns a
1269 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1270 *
1271 **/
1272void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1273{
1274 int i;
1275
1276 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1277
1278 for (i = 0; i < sizeof(lun); i += 2) {
1279 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1280 scsilun->scsi_lun[i+1] = lun & 0xFF;
1281 lun = lun >> 16;
1282 }
1283}
1284EXPORT_SYMBOL(int_to_scsilun);
1285
1286/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001288 * @starget: which target
1289 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1290 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 *
1292 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001293 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1294 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 *
Rob Landleyeb448202007-11-03 13:30:39 -05001296 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1297 * LUNs even if it's older than SCSI-3.
1298 * If BLIST_NOREPORTLUN is set, return 1 always.
1299 * If BLIST_NOLUN is set, return 0 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300 *
1301 * Return:
1302 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001303 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001305static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 int rescan)
1307{
1308 char devname[64];
1309 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1310 unsigned int length;
1311 unsigned int lun;
1312 unsigned int num_luns;
1313 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001314 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 u8 *data;
1317 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001318 struct scsi_device *sdev;
1319 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001320 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
1322 /*
1323 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1324 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1325 * support more than 8 LUNs.
1326 */
James Bottomley4d7db042006-03-31 20:07:45 -06001327 if (bflags & BLIST_NOREPORTLUN)
1328 return 1;
1329 if (starget->scsi_level < SCSI_2 &&
1330 starget->scsi_level != SCSI_UNKNOWN)
1331 return 1;
1332 if (starget->scsi_level < SCSI_3 &&
1333 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 return 1;
1335 if (bflags & BLIST_NOLUN)
1336 return 0;
1337
James Bottomley6f3a2022005-09-22 20:33:28 -05001338 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1339 sdev = scsi_alloc_sdev(starget, 0, NULL);
1340 if (!sdev)
1341 return 0;
1342 if (scsi_device_get(sdev))
1343 return 0;
1344 }
1345
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001347 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348
1349 /*
1350 * Allocate enough to hold the header (the same size as one scsi_lun)
1351 * plus the max number of luns we are requesting.
1352 *
1353 * Reallocating and trying again (with the exact amount we need)
1354 * would be nice, but then we need to somehow limit the size
1355 * allocated based on the available memory and the limits of
1356 * kmalloc - we don't want a kmalloc() failure of a huge value to
1357 * prevent us from finding any LUNs on this target.
1358 */
1359 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1360 lun_data = kmalloc(length, GFP_ATOMIC |
1361 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001362 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001363 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001364 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001365 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
1367 scsi_cmd[0] = REPORT_LUNS;
1368
1369 /*
1370 * bytes 1 - 5: reserved, set to zero.
1371 */
1372 memset(&scsi_cmd[1], 0, 5);
1373
1374 /*
1375 * bytes 6 - 9: length of the command.
1376 */
1377 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1378 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1379 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1380 scsi_cmd[9] = (unsigned char) length & 0xff;
1381
1382 scsi_cmd[10] = 0; /* reserved */
1383 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
1385 /*
1386 * We can get a UNIT ATTENTION, for example a power on/reset, so
1387 * retry a few times (like sd.c does for TEST UNIT READY).
1388 * Experience shows some combinations of adapter/devices get at
1389 * least two power on/resets.
1390 *
1391 * Illegal requests (for devices that do not support REPORT LUNS)
1392 * should come through as a check condition, and will not generate
1393 * a retry.
1394 */
1395 for (retries = 0; retries < 3; retries++) {
1396 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1397 " REPORT LUNS to %s (try %d)\n", devname,
1398 retries));
James Bottomley39216032005-06-15 18:48:29 -05001399
James Bottomley39216032005-06-15 18:48:29 -05001400 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001401 lun_data, length, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001402 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001403
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001405 " %s (try %d) result 0x%x\n", result
1406 ? "failed" : "successful", retries, result));
1407 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001409 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 if (sshdr.sense_key != UNIT_ATTENTION)
1411 break;
1412 }
1413 }
1414
James Bottomley39216032005-06-15 18:48:29 -05001415 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 /*
1417 * The device probably does not support a REPORT LUN command
1418 */
Alan Stern2ef89192005-11-08 15:51:55 -05001419 ret = 1;
1420 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
1423 /*
1424 * Get the length from the first four bytes of lun_data.
1425 */
1426 data = (u8 *) lun_data->scsi_lun;
1427 length = ((data[0] << 24) | (data[1] << 16) |
1428 (data[2] << 8) | (data[3] << 0));
1429
1430 num_luns = (length / sizeof(struct scsi_lun));
1431 if (num_luns > max_scsi_report_luns) {
1432 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1433 " of %d luns reported, try increasing"
1434 " max_scsi_report_luns.\n", devname,
1435 max_scsi_report_luns, num_luns);
1436 num_luns = max_scsi_report_luns;
1437 }
1438
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001439 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1440 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441
1442 /*
1443 * Scan the luns in lun_data. The entry at offset 0 is really
1444 * the header, so start at 1 and go up to and including num_luns.
1445 */
1446 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1447 lun = scsilun_to_int(lunp);
1448
1449 /*
1450 * Check if the unused part of lunp is non-zero, and so
1451 * does not fit in lun.
1452 */
1453 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1454 int i;
1455
1456 /*
1457 * Output an error displaying the LUN in byte order,
1458 * this differs from what linux would print for the
1459 * integer LUN value.
1460 */
1461 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1462 data = (char *)lunp->scsi_lun;
1463 for (i = 0; i < sizeof(struct scsi_lun); i++)
1464 printk("%02x", data[i]);
1465 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 } else if (lun > sdev->host->max_lun) {
1467 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1468 " than allowed by the host adapter\n",
1469 devname, lun);
1470 } else {
1471 int res;
1472
1473 res = scsi_probe_and_add_lun(starget,
1474 lun, NULL, NULL, rescan, NULL);
1475 if (res == SCSI_SCAN_NO_RESPONSE) {
1476 /*
1477 * Got some results, but now none, abort.
1478 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001479 sdev_printk(KERN_ERR, sdev,
1480 "Unexpected response"
1481 " from lun %d while scanning, scan"
1482 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 break;
1484 }
1485 }
1486 }
1487
Alan Stern2ef89192005-11-08 15:51:55 -05001488 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001491 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001492 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001493 /*
1494 * the sdev we used didn't appear in the report luns scan
1495 */
James Bottomley860dc732009-11-19 17:48:29 -05001496 __scsi_remove_device(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001497 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498}
1499
1500struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1501 uint id, uint lun, void *hostdata)
1502{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001503 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001505 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001507 if (strncmp(scsi_scan_type, "none", 4) == 0)
1508 return ERR_PTR(-ENODEV);
1509
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001510 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 if (!starget)
1512 return ERR_PTR(-ENOMEM);
1513
Arjan van de Ven0b950672006-01-11 13:16:10 +01001514 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001515 if (!shost->async_scan)
1516 scsi_complete_async_scans();
1517
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001518 if (scsi_host_scan_allowed(shost))
1519 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001520 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 scsi_target_reap(starget);
1522 put_device(&starget->dev);
1523
1524 return sdev;
1525}
1526EXPORT_SYMBOL(__scsi_add_device);
1527
James Bottomley146f7262005-09-10 12:44:09 -05001528int scsi_add_device(struct Scsi_Host *host, uint channel,
1529 uint target, uint lun)
1530{
1531 struct scsi_device *sdev =
1532 __scsi_add_device(host, channel, target, lun, NULL);
1533 if (IS_ERR(sdev))
1534 return PTR_ERR(sdev);
1535
1536 scsi_device_put(sdev);
1537 return 0;
1538}
1539EXPORT_SYMBOL(scsi_add_device);
1540
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541void scsi_rescan_device(struct device *dev)
1542{
1543 struct scsi_driver *drv;
1544
1545 if (!dev->driver)
1546 return;
1547
1548 drv = to_scsi_driver(dev->driver);
1549 if (try_module_get(drv->owner)) {
1550 if (drv->rescan)
1551 drv->rescan(dev);
1552 module_put(drv->owner);
1553 }
1554}
1555EXPORT_SYMBOL(scsi_rescan_device);
1556
Alan Sterne517d312005-07-26 10:18:45 -04001557static void __scsi_scan_target(struct device *parent, unsigned int channel,
1558 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559{
1560 struct Scsi_Host *shost = dev_to_shost(parent);
1561 int bflags = 0;
1562 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 struct scsi_target *starget;
1564
1565 if (shost->this_id == id)
1566 /*
1567 * Don't scan the host adapter
1568 */
1569 return;
1570
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 if (!starget)
1573 return;
1574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 if (lun != SCAN_WILD_CARD) {
1576 /*
1577 * Scan for a specific host/chan/id/lun.
1578 */
1579 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1580 goto out_reap;
1581 }
1582
1583 /*
1584 * Scan LUN 0, if there is some response, scan further. Ideally, we
1585 * would not configure LUN 0 until all LUNs are scanned.
1586 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001587 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1588 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1589 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590 /*
1591 * The REPORT LUN did not scan the target,
1592 * do a sequential scan.
1593 */
1594 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001595 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597
1598 out_reap:
1599 /* now determine if the target has any children at all
1600 * and if not, nuke it */
1601 scsi_target_reap(starget);
1602
1603 put_device(&starget->dev);
1604}
Alan Sterne517d312005-07-26 10:18:45 -04001605
1606/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001607 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001608 * @parent: host to scan
1609 * @channel: channel to scan
1610 * @id: target id to scan
1611 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1612 * @rescan: passed to LUN scanning routines
1613 *
1614 * Description:
1615 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1616 * and possibly all LUNs on the target id.
1617 *
1618 * First try a REPORT LUN scan, if that does not scan the target, do a
1619 * sequential scan of LUNs on the target id.
1620 **/
1621void scsi_scan_target(struct device *parent, unsigned int channel,
1622 unsigned int id, unsigned int lun, int rescan)
1623{
1624 struct Scsi_Host *shost = dev_to_shost(parent);
1625
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001626 if (strncmp(scsi_scan_type, "none", 4) == 0)
1627 return;
1628
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001629 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001630 if (!shost->async_scan)
1631 scsi_complete_async_scans();
1632
Alan Sterne517d312005-07-26 10:18:45 -04001633 if (scsi_host_scan_allowed(shost))
1634 __scsi_scan_target(parent, channel, id, lun, rescan);
Arjan van de Ven0b950672006-01-11 13:16:10 +01001635 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001636}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637EXPORT_SYMBOL(scsi_scan_target);
1638
1639static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1640 unsigned int id, unsigned int lun, int rescan)
1641{
1642 uint order_id;
1643
1644 if (id == SCAN_WILD_CARD)
1645 for (id = 0; id < shost->max_id; ++id) {
1646 /*
1647 * XXX adapter drivers when possible (FCP, iSCSI)
1648 * could modify max_id to match the current max,
1649 * not the absolute max.
1650 *
1651 * XXX add a shost id iterator, so for example,
1652 * the FC ID can be the same as a target id
1653 * without a huge overhead of sparse id's.
1654 */
1655 if (shost->reverse_ordering)
1656 /*
1657 * Scan from high to low id.
1658 */
1659 order_id = shost->max_id - id - 1;
1660 else
1661 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001662 __scsi_scan_target(&shost->shost_gendev, channel,
1663 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001664 }
1665 else
Alan Sterne517d312005-07-26 10:18:45 -04001666 __scsi_scan_target(&shost->shost_gendev, channel,
1667 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668}
1669
1670int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1671 unsigned int id, unsigned int lun, int rescan)
1672{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001673 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1674 "%s: <%u:%u:%u>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001675 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676
1677 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001678 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1680 return -EINVAL;
1681
Arjan van de Ven0b950672006-01-11 13:16:10 +01001682 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001683 if (!shost->async_scan)
1684 scsi_complete_async_scans();
1685
Mike Anderson82f29462005-06-16 11:14:33 -07001686 if (scsi_host_scan_allowed(shost)) {
1687 if (channel == SCAN_WILD_CARD)
1688 for (channel = 0; channel <= shost->max_channel;
1689 channel++)
1690 scsi_scan_channel(shost, channel, id, lun,
1691 rescan);
1692 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 scsi_scan_channel(shost, channel, id, lun, rescan);
Mike Anderson82f29462005-06-16 11:14:33 -07001694 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001695 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696
1697 return 0;
1698}
1699
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001700static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1701{
1702 struct scsi_device *sdev;
1703 shost_for_each_device(sdev, shost) {
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001704 if (!scsi_host_scan_allowed(shost) ||
1705 scsi_sysfs_add_sdev(sdev) != 0)
James Bottomley860dc732009-11-19 17:48:29 -05001706 __scsi_remove_device(sdev);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001707 }
1708}
1709
1710/**
1711 * scsi_prep_async_scan - prepare for an async scan
1712 * @shost: the host which will be scanned
1713 * Returns: a cookie to be passed to scsi_finish_async_scan()
1714 *
1715 * Tells the midlayer this host is going to do an asynchronous scan.
1716 * It reserves the host's position in the scanning list and ensures
1717 * that other asynchronous scans started after this one won't affect the
1718 * ordering of the discovered devices.
1719 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001720static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001721{
1722 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001723 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001724
1725 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1726 return NULL;
1727
1728 if (shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001729 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001730 shost->host_no);
1731 dump_stack();
1732 return NULL;
1733 }
1734
1735 data = kmalloc(sizeof(*data), GFP_KERNEL);
1736 if (!data)
1737 goto err;
1738 data->shost = scsi_host_get(shost);
1739 if (!data->shost)
1740 goto err;
1741 init_completion(&data->prev_finished);
1742
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001743 mutex_lock(&shost->scan_mutex);
1744 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001745 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001746 spin_unlock_irqrestore(shost->host_lock, flags);
1747 mutex_unlock(&shost->scan_mutex);
1748
1749 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001750 if (list_empty(&scanning_hosts))
1751 complete(&data->prev_finished);
1752 list_add_tail(&data->list, &scanning_hosts);
1753 spin_unlock(&async_scan_lock);
1754
1755 return data;
1756
1757 err:
1758 kfree(data);
1759 return NULL;
1760}
1761
1762/**
1763 * scsi_finish_async_scan - asynchronous scan has finished
1764 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1765 *
1766 * All the devices currently attached to this host have been found.
1767 * This function announces all the devices it has found to the rest
1768 * of the system.
1769 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001770static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001771{
1772 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001773 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001774
1775 if (!data)
1776 return;
1777
1778 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001779
1780 mutex_lock(&shost->scan_mutex);
1781
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001782 if (!shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001783 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001784 shost->host_no);
1785 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001786 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001787 return;
1788 }
1789
1790 wait_for_completion(&data->prev_finished);
1791
1792 scsi_sysfs_add_devices(shost);
1793
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001794 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001795 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001796 spin_unlock_irqrestore(shost->host_lock, flags);
1797
1798 mutex_unlock(&shost->scan_mutex);
1799
1800 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001801 list_del(&data->list);
1802 if (!list_empty(&scanning_hosts)) {
1803 struct async_scan_data *next = list_entry(scanning_hosts.next,
1804 struct async_scan_data, list);
1805 complete(&next->prev_finished);
1806 }
1807 spin_unlock(&async_scan_lock);
1808
1809 scsi_host_put(shost);
1810 kfree(data);
1811}
1812
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001813static void do_scsi_scan_host(struct Scsi_Host *shost)
1814{
1815 if (shost->hostt->scan_finished) {
1816 unsigned long start = jiffies;
1817 if (shost->hostt->scan_start)
1818 shost->hostt->scan_start(shost);
1819
1820 while (!shost->hostt->scan_finished(shost, jiffies - start))
1821 msleep(10);
1822 } else {
1823 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1824 SCAN_WILD_CARD, 0);
1825 }
1826}
1827
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001828static int do_scan_async(void *_data)
1829{
1830 struct async_scan_data *data = _data;
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001831 do_scsi_scan_host(data->shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001832 scsi_finish_async_scan(data);
1833 return 0;
1834}
1835
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836/**
1837 * scsi_scan_host - scan the given adapter
1838 * @shost: adapter to scan
1839 **/
1840void scsi_scan_host(struct Scsi_Host *shost)
1841{
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001842 struct task_struct *p;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001843 struct async_scan_data *data;
1844
1845 if (strncmp(scsi_scan_type, "none", 4) == 0)
1846 return;
1847
1848 data = scsi_prep_async_scan(shost);
1849 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001850 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001851 return;
1852 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001853
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001854 p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001855 if (IS_ERR(p))
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001856 do_scan_async(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857}
1858EXPORT_SYMBOL(scsi_scan_host);
1859
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860void scsi_forget_host(struct Scsi_Host *shost)
1861{
Alan Sterna64358d2005-07-26 10:27:10 -04001862 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 unsigned long flags;
1864
Alan Sterna64358d2005-07-26 10:27:10 -04001865 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001866 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001867 list_for_each_entry(sdev, &shost->__devices, siblings) {
1868 if (sdev->sdev_state == SDEV_DEL)
1869 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001871 __scsi_remove_device(sdev);
1872 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 }
1874 spin_unlock_irqrestore(shost->host_lock, flags);
1875}
1876
1877/*
1878 * Function: scsi_get_host_dev()
1879 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001880 * Purpose: Create a scsi_device that points to the host adapter itself.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001882 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883 *
1884 * Lock status: None assumed.
1885 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001886 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 *
1888 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001889 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 * be made to look like a "pseudo-device" that points to the
1891 * HA itself.
1892 *
1893 * Note - this device is not accessible from any high-level
1894 * drivers (including generics), which is probably not
1895 * optimal. We can add hooks later to attach
1896 */
1897struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1898{
Alan Sterne517d312005-07-26 10:18:45 -04001899 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001900 struct scsi_target *starget;
1901
Arjan van de Ven0b950672006-01-11 13:16:10 +01001902 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001903 if (!scsi_host_scan_allowed(shost))
1904 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1906 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001907 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908
1909 sdev = scsi_alloc_sdev(starget, 0, NULL);
1910 if (sdev) {
1911 sdev->sdev_gendev.parent = get_device(&starget->dev);
1912 sdev->borken = 0;
James Bottomley884d25c2006-09-05 16:26:41 -05001913 } else
1914 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001916 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001917 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 return sdev;
1919}
1920EXPORT_SYMBOL(scsi_get_host_dev);
1921
1922/*
1923 * Function: scsi_free_host_dev()
1924 *
1925 * Purpose: Free a scsi_device that points to the host adapter itself.
1926 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001927 * Arguments: SHpnt - Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928 *
1929 * Lock status: None assumed.
1930 *
1931 * Returns: Nothing
1932 *
1933 * Notes:
1934 */
1935void scsi_free_host_dev(struct scsi_device *sdev)
1936{
1937 BUG_ON(sdev->id != sdev->host->this_id);
1938
James Bottomley860dc732009-11-19 17:48:29 -05001939 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940}
1941EXPORT_SYMBOL(scsi_free_host_dev);
1942