blob: 3d0a1e6e9c489cb79647c54e28865e79cc733d4c [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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090036#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020039#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <scsi/scsi_device.h>
41#include <scsi/scsi_driver.h>
42#include <scsi/scsi_devinfo.h>
43#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <scsi/scsi_transport.h>
45#include <scsi/scsi_eh.h>
46
47#include "scsi_priv.h"
48#include "scsi_logging.h"
49
50#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
51 " SCSI scanning, some SCSI devices might not be configured\n"
52
53/*
54 * Default timeout
55 */
56#define SCSI_TIMEOUT (2*HZ)
57
58/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010059 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 */
61#define SCSI_UID_SER_NUM 'S'
62#define SCSI_UID_UNKNOWN 'Z'
63
64/*
65 * Return values of some of the scanning functions.
66 *
67 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
68 * includes allocation or general failures preventing IO from being sent.
69 *
70 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
71 * on the given LUN.
72 *
73 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
74 * given LUN.
75 */
76#define SCSI_SCAN_NO_RESPONSE 0
77#define SCSI_SCAN_TARGET_PRESENT 1
78#define SCSI_SCAN_LUN_PRESENT 2
79
Arjan van de Ven0ad78202005-11-28 16:22:25 +010080static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82#define MAX_SCSI_LUNS 512
83
84#ifdef CONFIG_SCSI_MULTI_LUN
85static unsigned int max_scsi_luns = MAX_SCSI_LUNS;
86#else
87static unsigned int max_scsi_luns = 1;
88#endif
89
Masatake YAMATO10f4b892007-09-19 22:59:16 +090090module_param_named(max_luns, max_scsi_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091MODULE_PARM_DESC(max_luns,
92 "last scsi LUN (should be between 1 and 2^32-1)");
93
Matthew Wilcox21db1882006-11-22 13:24:52 -070094#ifdef CONFIG_SCSI_SCAN_ASYNC
95#define SCSI_SCAN_TYPE_DEFAULT "async"
96#else
97#define SCSI_SCAN_TYPE_DEFAULT "sync"
98#endif
99
100static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600101
102module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
103MODULE_PARM_DESC(scan, "sync, async or none");
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105/*
106 * max_scsi_report_luns: the maximum number of LUNS that will be
107 * returned from the REPORT LUNS command. 8 times this value must
108 * be allocated. In theory this could be up to an 8 byte value, but
109 * in practice, the maximum number of LUNs suppored by any device
110 * is about 16k.
111 */
112static unsigned int max_scsi_report_luns = 511;
113
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900114module_param_named(max_report_luns, max_scsi_report_luns, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115MODULE_PARM_DESC(max_report_luns,
116 "REPORT LUNS maximum number of LUNS received (should be"
117 " between 1 and 16384)");
118
Alan Stern14faf122009-03-12 11:08:51 -0400119static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900121module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122MODULE_PARM_DESC(inq_timeout,
123 "Timeout (in seconds) waiting for devices to answer INQUIRY."
Alan Stern14faf122009-03-12 11:08:51 -0400124 " Default is 20. Some devices may need more; most need less.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600126/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600127static DEFINE_SPINLOCK(async_scan_lock);
128static LIST_HEAD(scanning_hosts);
129
130struct async_scan_data {
131 struct list_head list;
132 struct Scsi_Host *shost;
133 struct completion prev_finished;
134};
135
136/**
137 * scsi_complete_async_scans - Wait for asynchronous scans to complete
138 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700139 * When this function returns, any host which started scanning before
140 * this function was called will have finished its scan. Hosts which
141 * started scanning after this function was called may or may not have
142 * finished.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600143 */
144int scsi_complete_async_scans(void)
145{
146 struct async_scan_data *data;
147
148 do {
149 if (list_empty(&scanning_hosts))
150 return 0;
151 /* If we can't get memory immediately, that's OK. Just
152 * sleep a little. Even if we never get memory, the async
153 * scans will finish eventually.
154 */
155 data = kmalloc(sizeof(*data), GFP_KERNEL);
156 if (!data)
157 msleep(1);
158 } while (!data);
159
160 data->shost = NULL;
161 init_completion(&data->prev_finished);
162
163 spin_lock(&async_scan_lock);
164 /* Check that there's still somebody else on the list */
165 if (list_empty(&scanning_hosts))
166 goto done;
167 list_add_tail(&data->list, &scanning_hosts);
168 spin_unlock(&async_scan_lock);
169
170 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
171 wait_for_completion(&data->prev_finished);
172
173 spin_lock(&async_scan_lock);
174 list_del(&data->list);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700175 if (!list_empty(&scanning_hosts)) {
176 struct async_scan_data *next = list_entry(scanning_hosts.next,
177 struct async_scan_data, list);
178 complete(&next->prev_finished);
179 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600180 done:
181 spin_unlock(&async_scan_lock);
182
183 kfree(data);
184 return 0;
185}
186
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600187/* Only exported for the benefit of scsi_wait_scan */
188EXPORT_SYMBOL_GPL(scsi_complete_async_scans);
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600189
Hugh Dickinsf2f027c2007-05-23 14:41:42 -0700190#ifndef MODULE
191/*
192 * For async scanning we need to wait for all the scans to complete before
193 * trying to mount the root fs. Otherwise non-modular drivers may not be ready
194 * yet.
195 */
196late_initcall(scsi_complete_async_scans);
197#endif
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199/**
200 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500201 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 * @result: area to store the result of the MODE SENSE
203 *
204 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500205 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 * Called for BLIST_KEY devices.
207 **/
James Bottomley39216032005-06-15 18:48:29 -0500208static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 unsigned char *result)
210{
211 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
212
213 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
214 scsi_cmd[0] = MODE_SENSE;
215 scsi_cmd[1] = 0;
216 scsi_cmd[2] = 0x2e;
217 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500218 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500220 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900221 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222}
223
224/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500226 * @starget: which target to allocate a &scsi_device for
227 * @lun: which lun
228 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 *
230 * Description:
231 * Allocate, initialize for io, and return a pointer to a scsi_Device.
232 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
233 * adds scsi_Device to the appropriate list.
234 *
235 * Return value:
236 * scsi_Device pointer, or NULL on failure.
237 **/
238static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
239 unsigned int lun, void *hostdata)
240{
241 struct scsi_device *sdev;
242 int display_failure_msg = 1, ret;
243 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400244 extern void scsi_evt_thread(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Jes Sorensen24669f752006-01-16 10:31:18 -0500246 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 GFP_ATOMIC);
248 if (!sdev)
249 goto out;
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 sdev->vendor = scsi_null_device_strs;
252 sdev->model = scsi_null_device_strs;
253 sdev->rev = scsi_null_device_strs;
254 sdev->host = shost;
Vasu Dev4a840672009-10-22 15:46:33 -0700255 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 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);
James Bottomley37e6ba02009-10-02 13:30:08 -0500322 put_device(&sdev->sdev_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 put_device(&sdev->sdev_gendev);
324out:
325 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700326 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 return NULL;
328}
329
James Bottomley643eb2d2008-03-22 22:42:27 -0500330static void scsi_target_destroy(struct scsi_target *starget)
331{
332 struct device *dev = &starget->dev;
333 struct Scsi_Host *shost = dev_to_shost(dev->parent);
334 unsigned long flags;
335
336 transport_destroy_device(dev);
337 spin_lock_irqsave(shost->host_lock, flags);
338 if (shost->hostt->target_destroy)
339 shost->hostt->target_destroy(starget);
340 list_del_init(&starget->siblings);
341 spin_unlock_irqrestore(shost->host_lock, flags);
342 put_device(dev);
343}
344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345static void scsi_target_dev_release(struct device *dev)
346{
347 struct device *parent = dev->parent;
348 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500349
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 kfree(starget);
351 put_device(parent);
352}
353
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700354static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100355 .name = "scsi_target",
356 .release = scsi_target_dev_release,
357};
358
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359int scsi_is_target_device(const struct device *dev)
360{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100361 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362}
363EXPORT_SYMBOL(scsi_is_target_device);
364
365static struct scsi_target *__scsi_find_target(struct device *parent,
366 int channel, uint id)
367{
368 struct scsi_target *starget, *found_starget = NULL;
369 struct Scsi_Host *shost = dev_to_shost(parent);
370 /*
371 * Search for an existing target for this sdev.
372 */
373 list_for_each_entry(starget, &shost->__targets, siblings) {
374 if (starget->id == id &&
375 starget->channel == channel) {
376 found_starget = starget;
377 break;
378 }
379 }
380 if (found_starget)
381 get_device(&found_starget->dev);
382
383 return found_starget;
384}
385
James Bottomley884d25c2006-09-05 16:26:41 -0500386/**
387 * scsi_alloc_target - allocate a new or find an existing target
388 * @parent: parent of the target (need not be a scsi host)
389 * @channel: target channel number (zero if no channels)
390 * @id: target id number
391 *
392 * Return an existing target if one exists, provided it hasn't already
393 * gone into STARGET_DEL state, otherwise allocate a new target.
394 *
395 * The target is returned with an incremented reference, so the caller
396 * is responsible for both reaping and doing a last put
397 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398static struct scsi_target *scsi_alloc_target(struct device *parent,
399 int channel, uint id)
400{
401 struct Scsi_Host *shost = dev_to_shost(parent);
402 struct device *dev = NULL;
403 unsigned long flags;
404 const int size = sizeof(struct scsi_target)
405 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400406 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600408 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Jes Sorensen24669f752006-01-16 10:31:18 -0500410 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700412 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 return NULL;
414 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 dev = &starget->dev;
416 device_initialize(dev);
417 starget->reap_ref = 1;
418 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100419 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100420#ifndef CONFIG_SYSFS_DEPRECATED
421 dev->bus = &scsi_bus_type;
422#endif
423 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 starget->id = id;
425 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500426 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 INIT_LIST_HEAD(&starget->siblings);
428 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500429 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500430 starget->scsi_level = SCSI_2;
Edward Gogginc53a2842009-04-09 10:02:22 -0700431 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
James Bottomleyffedb452006-02-23 14:27:18 -0600432 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 spin_lock_irqsave(shost->host_lock, flags);
434
435 found_target = __scsi_find_target(parent, channel, id);
436 if (found_target)
437 goto found;
438
439 list_add_tail(&starget->siblings, &shost->__targets);
440 spin_unlock_irqrestore(shost->host_lock, flags);
441 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500442 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500443 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600444 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500445
446 if(error) {
447 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
448 /* don't want scsi_target_reap to do the final
449 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500450 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500451 return NULL;
452 }
453 }
James Bottomley884d25c2006-09-05 16:26:41 -0500454 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return starget;
457
458 found:
459 found_target->reap_ref++;
460 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600461 if (found_target->state != STARGET_DEL) {
Alan Stern12fb8c12010-03-18 15:41:22 -0400462 put_device(dev);
James Bottomleyffedb452006-02-23 14:27:18 -0600463 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;
Alan Sternf9e88942010-03-18 15:39:30 -0400495 int empty = 0;
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;
Alan Sternf9e88942010-03-18 15:39:30 -0400499 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
500 empty = 1;
501 starget->state = STARGET_DEL;
502 }
James Bottomleyffedb452006-02-23 14:27:18 -0600503 spin_unlock_irqrestore(shost->host_lock, flags);
504
James Bottomley643eb2d2008-03-22 22:42:27 -0500505 if (!empty)
506 return;
507
508 BUG_ON(state == STARGET_DEL);
James Bottomley643eb2d2008-03-22 22:42:27 -0500509 if (state == STARGET_CREATED)
510 scsi_target_destroy(starget);
511 else
512 execute_in_process_context(scsi_target_reap_usercontext,
513 &starget->ew);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514}
515
516/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400517 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
518 * @s: INQUIRY result string to sanitize
519 * @len: length of the string
520 *
521 * Description:
522 * The SCSI spec says that INQUIRY vendor, product, and revision
523 * strings must consist entirely of graphic ASCII characters,
524 * padded on the right with spaces. Since not all devices obey
525 * this rule, we will replace non-graphic or non-ASCII characters
526 * with spaces. Exception: a NUL character is interpreted as a
527 * string terminator, so all the following characters are set to
528 * spaces.
529 **/
530static void sanitize_inquiry_string(unsigned char *s, int len)
531{
532 int terminated = 0;
533
534 for (; len > 0; (--len, ++s)) {
535 if (*s == 0)
536 terminated = 1;
537 if (terminated || *s < 0x20 || *s > 0x7e)
538 *s = ' ';
539 }
540}
541
542/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500544 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500546 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 * @bflags: store any bflags found here
548 *
549 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500550 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 *
James Bottomley39216032005-06-15 18:48:29 -0500552 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100554 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400556static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500557 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
560 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
561 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500562 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 struct scsi_sense_hdr sshdr;
564
565 *bflags = 0;
566
567 /* Perform up to 3 passes. The first pass uses a conservative
568 * transfer length of 36 unless sdev->inquiry_len specifies a
569 * different value. */
570 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
571 try_inquiry_len = first_inquiry_len;
572 pass = 1;
573
574 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500575 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
576 "scsi scan: INQUIRY pass %d length %d\n",
577 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 /* Each pass gets up to three chances to ignore Unit Attention */
580 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900581 int resid;
582
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 memset(scsi_cmd, 0, 6);
584 scsi_cmd[0] = INQUIRY;
585 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
587 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500588
589 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500590 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900591 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900592 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
594 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
595 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500596 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
James Bottomley39216032005-06-15 18:48:29 -0500598 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 /*
600 * not-ready to ready transition [asc/ascq=0x28/0x0]
601 * or power-on, reset [asc/ascq=0x29/0x0], continue.
602 * INQUIRY should not yield UNIT_ATTENTION
603 * but many buggy devices do so anyway.
604 */
James Bottomley39216032005-06-15 18:48:29 -0500605 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500606 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 if ((sshdr.sense_key == UNIT_ATTENTION) &&
608 ((sshdr.asc == 0x28) ||
609 (sshdr.asc == 0x29)) &&
610 (sshdr.ascq == 0))
611 continue;
612 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900613 } else {
614 /*
615 * if nothing was transferred, we try
616 * again. It's a workaround for some USB
617 * devices.
618 */
619 if (resid == try_inquiry_len)
620 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 }
622 break;
623 }
624
James Bottomley39216032005-06-15 18:48:29 -0500625 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400626 sanitize_inquiry_string(&inq_result[8], 8);
627 sanitize_inquiry_string(&inq_result[16], 16);
628 sanitize_inquiry_string(&inq_result[32], 4);
629
630 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 if (response_len > 255)
632 response_len = first_inquiry_len; /* sanity */
633
634 /*
635 * Get any flags for this device.
636 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100637 * XXX add a bflags to scsi_device, and replace the
638 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 * need not be passed as an argument.
640 */
641 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
642 &inq_result[16]);
643
644 /* When the first pass succeeds we gain information about
645 * what larger transfer lengths might work. */
646 if (pass == 1) {
647 if (BLIST_INQUIRY_36 & *bflags)
648 next_inquiry_len = 36;
649 else if (BLIST_INQUIRY_58 & *bflags)
650 next_inquiry_len = 58;
651 else if (sdev->inquiry_len)
652 next_inquiry_len = sdev->inquiry_len;
653 else
654 next_inquiry_len = response_len;
655
656 /* If more data is available perform the second pass */
657 if (next_inquiry_len > try_inquiry_len) {
658 try_inquiry_len = next_inquiry_len;
659 pass = 2;
660 goto next_pass;
661 }
662 }
663
664 } else if (pass == 2) {
665 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
666 "Consider BLIST_INQUIRY_36 for this device\n",
667 try_inquiry_len);
668
669 /* If this pass failed, the third pass goes back and transfers
670 * the same amount as we successfully got in the first pass. */
671 try_inquiry_len = first_inquiry_len;
672 pass = 3;
673 goto next_pass;
674 }
675
676 /* If the last transfer attempt got an error, assume the
677 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500678 if (result)
679 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680
681 /* Don't report any more data than the device says is valid */
682 sdev->inquiry_len = min(try_inquiry_len, response_len);
683
684 /*
685 * XXX Abort if the response length is less than 36? If less than
686 * 32, the lookup of the device flags (above) could be invalid,
687 * and it would be possible to take an incorrect action - we do
688 * not want to hang because of a short INQUIRY. On the flip side,
689 * if the device is spun down or becoming ready (and so it gives a
690 * short INQUIRY), an abort here prevents any further use of the
691 * device, including spin up.
692 *
Alan Sterne423ee32007-02-16 01:46:38 -0800693 * On the whole, the best approach seems to be to assume the first
694 * 36 bytes are valid no matter what the device says. That's
695 * better than copying < 36 bytes to the inquiry-result buffer
696 * and displaying garbage for the Vendor, Product, or Revision
697 * strings.
698 */
699 if (sdev->inquiry_len < 36) {
700 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
701 " using 36\n", sdev->inquiry_len);
702 sdev->inquiry_len = 36;
703 }
704
705 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 * Related to the above issue:
707 *
708 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
709 * and if not ready, sent a START_STOP to start (maybe spin up) and
710 * then send the INQUIRY again, since the INQUIRY can change after
711 * a device is initialized.
712 *
713 * Ideally, start a device if explicitly asked to do so. This
714 * assumes that a device is spun up on power on, spun down on
715 * request, and then spun up on request.
716 */
717
718 /*
719 * The scanning code needs to know the scsi_level, even if no
720 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
721 * non-zero LUNs can be scanned.
722 */
723 sdev->scsi_level = inq_result[2] & 0x07;
724 if (sdev->scsi_level >= 2 ||
725 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
726 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500727 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
James Bottomley39216032005-06-15 18:48:29 -0500729 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730}
731
732/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100733 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600734 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 * @inq_result: holds the result of a previous INQUIRY to the LUN
736 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600737 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 *
739 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600740 * Initialize the scsi_device @sdev. Optionally set fields based
741 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 *
743 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100744 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
745 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400747static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600748 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749{
James Bottomley6f4267e2008-08-22 16:53:31 -0500750 int ret;
751
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 /*
753 * XXX do not save the inquiry, since it can change underneath us,
754 * save just vendor/model/rev.
755 *
756 * Rather than save it and have an ioctl that retrieves the saved
757 * value, have an ioctl that executes the same INQUIRY code used
758 * in scsi_probe_lun, let user level programs doing INQUIRY
759 * scanning run at their own risk, or supply a user level program
760 * that can correctly scan.
761 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762
Alan Stern09123d22006-11-10 12:27:57 -0800763 /*
764 * Copy at least 36 bytes of INQUIRY data, so that we don't
765 * dereference unallocated memory when accessing the Vendor,
766 * Product, and Revision strings. Badly behaved devices may set
767 * the INQUIRY Additional Length byte to a small value, indicating
768 * these strings are invalid, but often they contain plausible data
769 * nonetheless. It doesn't matter if the device sent < 36 bytes
770 * total, since scsi_probe_lun() initializes inq_result with 0s.
771 */
772 sdev->inquiry = kmemdup(inq_result,
773 max_t(size_t, sdev->inquiry_len, 36),
774 GFP_ATOMIC);
775 if (sdev->inquiry == NULL)
776 return SCSI_SCAN_NO_RESPONSE;
777
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 sdev->vendor = (char *) (sdev->inquiry + 8);
779 sdev->model = (char *) (sdev->inquiry + 16);
780 sdev->rev = (char *) (sdev->inquiry + 32);
781
782 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600783 sdev->type = TYPE_ROM;
784 sdev->removable = 1;
785 } else {
786 sdev->type = (inq_result[0] & 0x1f);
787 sdev->removable = (inq_result[1] & 0x80) >> 7;
788 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
Matthew Wilcox6d877682007-07-11 12:54:55 -0600790 switch (sdev->type) {
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600791 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 case TYPE_TAPE:
793 case TYPE_DISK:
794 case TYPE_PRINTER:
795 case TYPE_MOD:
796 case TYPE_PROCESSOR:
797 case TYPE_SCANNER:
798 case TYPE_MEDIUM_CHANGER:
799 case TYPE_ENCLOSURE:
800 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600801 case TYPE_RAID:
Boaz Harrosh82443a52009-01-25 16:51:33 +0200802 case TYPE_OSD:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 sdev->writeable = 1;
804 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 case TYPE_ROM:
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600806 case TYPE_WORM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 sdev->writeable = 0;
808 break;
809 default:
810 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
811 }
812
Matthew Wilcox6d877682007-07-11 12:54:55 -0600813 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
814 /* RBC and MMC devices can return SCSI-3 compliance and yet
815 * still not support REPORT LUNS, so make them act as
816 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
817 * specifically set */
818 if ((*bflags & BLIST_REPORTLUN2) == 0)
819 *bflags |= BLIST_NOREPORTLUN;
820 }
821
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 /*
823 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
824 * spec says: The device server is capable of supporting the
825 * specified peripheral device type on this logical unit. However,
826 * the physical device is not currently connected to this logical
827 * unit.
828 *
829 * The above is vague, as it implies that we could treat 001 and
830 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100831 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 *
833 * Don't set the device offline here; rather let the upper
834 * level drivers eval the PQ to decide whether they should
835 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
836 */
837
838 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 sdev->lockable = sdev->removable;
840 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
841
Matthew Wilcox6d877682007-07-11 12:54:55 -0600842 if (sdev->scsi_level >= SCSI_3 ||
843 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 sdev->ppr = 1;
845 if (inq_result[7] & 0x60)
846 sdev->wdtr = 1;
847 if (inq_result[7] & 0x10)
848 sdev->sdtr = 1;
849
James Bottomley19ac0db2006-08-06 18:15:22 -0500850 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600851 "ANSI: %d%s\n", scsi_device_type(sdev->type),
852 sdev->vendor, sdev->model, sdev->rev,
853 sdev->inq_periph_qual, inq_result[2] & 0x07,
854 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
855
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
857 !(*bflags & BLIST_NOTQ))
858 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 /*
861 * Some devices (Texel CD ROM drives) have handshaking problems
862 * when used with the Seagate controllers. borken is initialized
863 * to 1, and then set it to 0 here.
864 */
865 if ((*bflags & BLIST_BORKEN) == 0)
866 sdev->borken = 0;
867
Matthew Wilcox6d877682007-07-11 12:54:55 -0600868 if (*bflags & BLIST_NO_ULD_ATTACH)
869 sdev->no_uld_attach = 1;
870
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 /*
872 * Apparently some really broken devices (contrary to the SCSI
873 * standards) need to be selected without asserting ATN
874 */
875 if (*bflags & BLIST_SELECT_NO_ATN)
876 sdev->select_no_atn = 1;
877
878 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600879 * Maximum 512 sector transfer length
880 * broken RA4x00 Compaq Disk Array
881 */
882 if (*bflags & BLIST_MAX_512)
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500883 blk_queue_max_hw_sectors(sdev->request_queue, 512);
James Bottomley4d7db042006-03-31 20:07:45 -0600884
885 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 * Some devices may not want to have a start command automatically
887 * issued when a device is added.
888 */
889 if (*bflags & BLIST_NOSTARTONADD)
890 sdev->no_start_on_add = 1;
891
892 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500893 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 sdev->use_10_for_rw = 1;
896
897 if (*bflags & BLIST_MS_SKIP_PAGE_08)
898 sdev->skip_ms_page_8 = 1;
899
900 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
901 sdev->skip_ms_page_3f = 1;
902
903 if (*bflags & BLIST_USE_10_BYTE_MS)
904 sdev->use_10_for_ms = 1;
905
906 /* set the device running here so that slave configure
907 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500908 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
909 if (ret) {
910 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
911
912 if (ret) {
913 sdev_printk(KERN_ERR, sdev,
914 "in wrong state %s to complete scan\n",
915 scsi_device_state_name(sdev->sdev_state));
916 return SCSI_SCAN_NO_RESPONSE;
917 }
918 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
920 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
921 sdev->use_192_bytes_for_3f = 1;
922
923 if (*bflags & BLIST_NOT_LOCKABLE)
924 sdev->lockable = 0;
925
926 if (*bflags & BLIST_RETRY_HWERROR)
927 sdev->retry_hwerror = 1;
928
929 transport_configure_device(&sdev->sdev_gendev);
930
Christoph Hellwig93805092006-02-17 12:11:29 +0100931 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500932 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100933 if (ret) {
934 /*
935 * if LLDD reports slave not present, don't clutter
936 * console with alloc failure messages
937 */
938 if (ret != -ENXIO) {
939 sdev_printk(KERN_ERR, sdev,
940 "failed to configure device\n");
941 }
942 return SCSI_SCAN_NO_RESPONSE;
943 }
944 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
Vasu Dev4a840672009-10-22 15:46:33 -0700946 sdev->max_queue_depth = sdev->queue_depth;
947
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948 /*
949 * Ok, the device is now all set up, we can
950 * register it and tell the rest of the kernel
951 * about it.
952 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600953 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700954 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
956 return SCSI_SCAN_LUN_PRESENT;
957}
958
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700959#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200960/**
Rob Landleyeb448202007-11-03 13:30:39 -0500961 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200962 * @buf: Output buffer with at least end-first+1 bytes of space
963 * @inq: Inquiry buffer (input)
964 * @first: Offset of string into inq
965 * @end: Index after last character in inq
966 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700967static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200968 unsigned first, unsigned end)
969{
970 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700971
972 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
973 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200974 buf[idx] = inq[idx+first];
975 term = idx+1;
976 } else {
977 buf[idx] = ' ';
978 }
979 }
980 buf[term] = 0;
981 return buf;
982}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700983#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500984
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985/**
986 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
987 * @starget: pointer to target device structure
988 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -0500990 * @sdevp: probe the LUN corresponding to this scsi_device
991 * @rescan: if nonzero skip some code only needed on first scan
992 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 *
994 * Description:
995 * Call scsi_probe_lun, if a LUN with an attached device is found,
996 * allocate and set it up by calling scsi_add_lun.
997 *
998 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100999 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1001 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001002 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 **/
1004static int scsi_probe_and_add_lun(struct scsi_target *starget,
1005 uint lun, int *bflagsp,
1006 struct scsi_device **sdevp, int rescan,
1007 void *hostdata)
1008{
1009 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001011 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1013
1014 /*
1015 * The rescan flag is used as an optimization, the first scan of a
1016 * host adapter calls into here with rescan == 0.
1017 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001018 sdev = scsi_device_lookup_by_target(starget, lun);
1019 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001020 if (rescan || !scsi_device_created(sdev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1022 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001023 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 if (sdevp)
1025 *sdevp = sdev;
1026 else
1027 scsi_device_put(sdev);
1028
1029 if (bflagsp)
1030 *bflagsp = scsi_get_device_flags(sdev,
1031 sdev->vendor,
1032 sdev->model);
1033 return SCSI_SCAN_LUN_PRESENT;
1034 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001035 scsi_device_put(sdev);
1036 } else
1037 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 if (!sdev)
1039 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001040
1041 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001042 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001044 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
James Bottomley39216032005-06-15 18:48:29 -05001046 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 goto out_free_result;
1048
Kurt Garloff4186ab12006-04-03 15:16:48 +02001049 if (bflagsp)
1050 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 /*
1052 * result contains valid SCSI INQUIRY data.
1053 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001054 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 /*
1056 * For a Peripheral qualifier 3 (011b), the SCSI
1057 * spec says: The device server is not capable of
1058 * supporting a physical device on this logical
1059 * unit.
1060 *
1061 * For disks, this implies that there is no
1062 * logical disk configured at sdev->lun, but there
1063 * is a target id responding.
1064 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001065 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1066 " peripheral qualifier of 3, device not"
1067 " added\n"))
1068 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001069 SCSI_LOG_SCAN_BUS(1, {
1070 unsigned char vend[9];
1071 unsigned char mod[17];
1072
1073 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001074 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001075 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001076 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001077 scsi_inq_str(mod, result, 16, 32));
1078 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001079
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001080 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001081
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 res = SCSI_SCAN_TARGET_PRESENT;
1083 goto out_free_result;
1084 }
1085
Alan Stern1bfc5d92006-02-09 15:26:18 -05001086 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001087 * Some targets may set slight variations of PQ and PDT to signal
1088 * that no LUN is present, so don't add sdev in these cases.
1089 * Two specific examples are:
1090 * 1) NetApp targets: return PQ=1, PDT=0x1f
1091 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1092 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1093 *
1094 * References:
1095 * 1) SCSI SPC-3, pp. 145-146
1096 * PQ=1: "A peripheral device having the specified peripheral
1097 * device type is not connected to this logical unit. However, the
1098 * device server is capable of supporting the specified peripheral
1099 * device type on this logical unit."
1100 * PDT=0x1f: "Unknown or no device type"
1101 * 2) USB UFI 1.0, p. 20
1102 * PDT=00h Direct-access device (floppy)
1103 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001104 */
dave wysochanski84961f22006-08-09 14:56:32 -04001105 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001106 (result[0] & 0x1f) == 0x1f &&
1107 !scsi_is_wlun(lun)) {
Alan Stern1bfc5d92006-02-09 15:26:18 -05001108 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1109 "scsi scan: peripheral device type"
1110 " of 31, no device added\n"));
1111 res = SCSI_SCAN_TARGET_PRESENT;
1112 goto out_free_result;
1113 }
1114
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001115 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 if (res == SCSI_SCAN_LUN_PRESENT) {
1117 if (bflags & BLIST_KEY) {
1118 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001119 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 }
1122
1123 out_free_result:
1124 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 out_free_sdev:
1126 if (res == SCSI_SCAN_LUN_PRESENT) {
1127 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001128 if (scsi_device_get(sdev) == 0) {
1129 *sdevp = sdev;
1130 } else {
1131 __scsi_remove_device(sdev);
1132 res = SCSI_SCAN_NO_RESPONSE;
1133 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001135 } else
James Bottomley860dc732009-11-19 17:48:29 -05001136 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 out:
1138 return res;
1139}
1140
1141/**
1142 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1143 * @starget: pointer to target structure to scan
1144 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001145 * @scsi_level: Which version of the standard does this device adhere to
1146 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 *
1148 * Description:
1149 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1150 * scanned) to some maximum lun until a LUN is found with no device
1151 * attached. Use the bflags to figure out any oddities.
1152 *
1153 * Modifies sdevscan->lun.
1154 **/
1155static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001156 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157{
1158 unsigned int sparse_lun, lun, max_dev_lun;
1159 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1160
1161 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
Kay Sievers71610f52008-12-03 22:41:36 +01001162 "%s\n", dev_name(&starget->dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163
1164 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1165 /*
1166 * If this device is known to support sparse multiple units,
1167 * override the other settings, and scan all of them. Normally,
1168 * SCSI-3 devices should be scanned via the REPORT LUNS.
1169 */
1170 if (bflags & BLIST_SPARSELUN) {
1171 max_dev_lun = shost->max_lun;
1172 sparse_lun = 1;
1173 } else
1174 sparse_lun = 0;
1175
1176 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 * If less than SCSI_1_CSS, and no special lun scaning, stop
1178 * scanning; this matches 2.4 behaviour, but could just be a bug
1179 * (to continue scanning a SCSI_1_CSS device).
1180 *
1181 * This test is broken. We might not have any device on lun0 for
1182 * a sparselun device, and if that's the case then how would we
1183 * know the real scsi_level, eh? It might make sense to just not
1184 * scan any SCSI_1 device for non-0 luns, but that check would best
1185 * go into scsi_alloc_sdev() and just have it return null when asked
1186 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1187 *
1188 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1189 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1190 == 0))
1191 return;
1192 */
1193 /*
1194 * If this device is known to support multiple units, override
1195 * the other settings, and scan all of them.
1196 */
1197 if (bflags & BLIST_FORCELUN)
1198 max_dev_lun = shost->max_lun;
1199 /*
1200 * REGAL CDC-4X: avoid hang after LUN 4
1201 */
1202 if (bflags & BLIST_MAX5LUN)
1203 max_dev_lun = min(5U, max_dev_lun);
1204 /*
1205 * Do not scan SCSI-2 or lower device past LUN 7, unless
1206 * BLIST_LARGELUN.
1207 */
1208 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1209 max_dev_lun = min(8U, max_dev_lun);
1210
1211 /*
1212 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1213 * until we reach the max, or no LUN is found and we are not
1214 * sparse_lun.
1215 */
1216 for (lun = 1; lun < max_dev_lun; ++lun)
1217 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1218 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1219 !sparse_lun)
1220 return;
1221}
1222
1223/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001224 * scsilun_to_int - convert a scsi_lun to an int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 * @scsilun: struct scsi_lun to be converted.
1226 *
1227 * Description:
1228 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1229 * integer, and return the result. The caller must check for
1230 * truncation before using this function.
1231 *
1232 * Notes:
1233 * The struct scsi_lun is assumed to be four levels, with each level
1234 * effectively containing a SCSI byte-ordered (big endian) short; the
1235 * addressing bits of each level are ignored (the highest two bits).
1236 * For a description of the LUN format, post SCSI-3 see the SCSI
1237 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1238 *
1239 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1240 * the integer: 0x0b030a04
1241 **/
Christof Schmitt462b7852007-06-19 10:25:30 +02001242int scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243{
1244 int i;
1245 unsigned int lun;
1246
1247 lun = 0;
1248 for (i = 0; i < sizeof(lun); i += 2)
1249 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1250 scsilun->scsi_lun[i + 1]) << (i * 8));
1251 return lun;
1252}
Christof Schmitt462b7852007-06-19 10:25:30 +02001253EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254
1255/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001256 * int_to_scsilun - reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001257 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001258 * @scsilun: struct scsi_lun to be set.
1259 *
1260 * Description:
1261 * Reverts the functionality of the scsilun_to_int, which packed
1262 * an 8-byte lun value into an int. This routine unpacks the int
1263 * back into the lun value.
1264 * Note: the scsilun_to_int() routine does not truly handle all
1265 * 8bytes of the lun value. This functions restores only as much
1266 * as was set by the routine.
1267 *
1268 * Notes:
1269 * Given an integer : 0x0b030a04, this function returns a
1270 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1271 *
1272 **/
1273void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1274{
1275 int i;
1276
1277 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1278
1279 for (i = 0; i < sizeof(lun); i += 2) {
1280 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1281 scsilun->scsi_lun[i+1] = lun & 0xFF;
1282 lun = lun >> 16;
1283 }
1284}
1285EXPORT_SYMBOL(int_to_scsilun);
1286
1287/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001289 * @starget: which target
1290 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1291 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 *
1293 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001294 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1295 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 *
Rob Landleyeb448202007-11-03 13:30:39 -05001297 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1298 * LUNs even if it's older than SCSI-3.
1299 * If BLIST_NOREPORTLUN is set, return 1 always.
1300 * If BLIST_NOLUN is set, return 0 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 *
1302 * Return:
1303 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001304 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001306static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 int rescan)
1308{
1309 char devname[64];
1310 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1311 unsigned int length;
1312 unsigned int lun;
1313 unsigned int num_luns;
1314 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001315 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 u8 *data;
1318 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001319 struct scsi_device *sdev;
1320 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001321 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322
1323 /*
1324 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1325 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1326 * support more than 8 LUNs.
1327 */
James Bottomley4d7db042006-03-31 20:07:45 -06001328 if (bflags & BLIST_NOREPORTLUN)
1329 return 1;
1330 if (starget->scsi_level < SCSI_2 &&
1331 starget->scsi_level != SCSI_UNKNOWN)
1332 return 1;
1333 if (starget->scsi_level < SCSI_3 &&
1334 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 return 1;
1336 if (bflags & BLIST_NOLUN)
1337 return 0;
1338
James Bottomley6f3a2022005-09-22 20:33:28 -05001339 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1340 sdev = scsi_alloc_sdev(starget, 0, NULL);
1341 if (!sdev)
1342 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001343 if (scsi_device_get(sdev)) {
1344 __scsi_remove_device(sdev);
James Bottomley6f3a2022005-09-22 20:33:28 -05001345 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001346 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001347 }
1348
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001350 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351
1352 /*
1353 * Allocate enough to hold the header (the same size as one scsi_lun)
1354 * plus the max number of luns we are requesting.
1355 *
1356 * Reallocating and trying again (with the exact amount we need)
1357 * would be nice, but then we need to somehow limit the size
1358 * allocated based on the available memory and the limits of
1359 * kmalloc - we don't want a kmalloc() failure of a huge value to
1360 * prevent us from finding any LUNs on this target.
1361 */
1362 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1363 lun_data = kmalloc(length, GFP_ATOMIC |
1364 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001365 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001366 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001367 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001368 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369
1370 scsi_cmd[0] = REPORT_LUNS;
1371
1372 /*
1373 * bytes 1 - 5: reserved, set to zero.
1374 */
1375 memset(&scsi_cmd[1], 0, 5);
1376
1377 /*
1378 * bytes 6 - 9: length of the command.
1379 */
1380 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1381 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1382 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1383 scsi_cmd[9] = (unsigned char) length & 0xff;
1384
1385 scsi_cmd[10] = 0; /* reserved */
1386 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387
1388 /*
1389 * We can get a UNIT ATTENTION, for example a power on/reset, so
1390 * retry a few times (like sd.c does for TEST UNIT READY).
1391 * Experience shows some combinations of adapter/devices get at
1392 * least two power on/resets.
1393 *
1394 * Illegal requests (for devices that do not support REPORT LUNS)
1395 * should come through as a check condition, and will not generate
1396 * a retry.
1397 */
1398 for (retries = 0; retries < 3; retries++) {
1399 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1400 " REPORT LUNS to %s (try %d)\n", devname,
1401 retries));
James Bottomley39216032005-06-15 18:48:29 -05001402
James Bottomley39216032005-06-15 18:48:29 -05001403 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001404 lun_data, length, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001405 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001406
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001408 " %s (try %d) result 0x%x\n", result
1409 ? "failed" : "successful", retries, result));
1410 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001412 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 if (sshdr.sense_key != UNIT_ATTENTION)
1414 break;
1415 }
1416 }
1417
James Bottomley39216032005-06-15 18:48:29 -05001418 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 /*
1420 * The device probably does not support a REPORT LUN command
1421 */
Alan Stern2ef89192005-11-08 15:51:55 -05001422 ret = 1;
1423 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425
1426 /*
1427 * Get the length from the first four bytes of lun_data.
1428 */
1429 data = (u8 *) lun_data->scsi_lun;
1430 length = ((data[0] << 24) | (data[1] << 16) |
1431 (data[2] << 8) | (data[3] << 0));
1432
1433 num_luns = (length / sizeof(struct scsi_lun));
1434 if (num_luns > max_scsi_report_luns) {
1435 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1436 " of %d luns reported, try increasing"
1437 " max_scsi_report_luns.\n", devname,
1438 max_scsi_report_luns, num_luns);
1439 num_luns = max_scsi_report_luns;
1440 }
1441
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001442 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1443 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444
1445 /*
1446 * Scan the luns in lun_data. The entry at offset 0 is really
1447 * the header, so start at 1 and go up to and including num_luns.
1448 */
1449 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1450 lun = scsilun_to_int(lunp);
1451
1452 /*
1453 * Check if the unused part of lunp is non-zero, and so
1454 * does not fit in lun.
1455 */
1456 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1457 int i;
1458
1459 /*
1460 * Output an error displaying the LUN in byte order,
1461 * this differs from what linux would print for the
1462 * integer LUN value.
1463 */
1464 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1465 data = (char *)lunp->scsi_lun;
1466 for (i = 0; i < sizeof(struct scsi_lun); i++)
1467 printk("%02x", data[i]);
1468 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 } else if (lun > sdev->host->max_lun) {
1470 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1471 " than allowed by the host adapter\n",
1472 devname, lun);
1473 } else {
1474 int res;
1475
1476 res = scsi_probe_and_add_lun(starget,
1477 lun, NULL, NULL, rescan, NULL);
1478 if (res == SCSI_SCAN_NO_RESPONSE) {
1479 /*
1480 * Got some results, but now none, abort.
1481 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001482 sdev_printk(KERN_ERR, sdev,
1483 "Unexpected response"
1484 " from lun %d while scanning, scan"
1485 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486 break;
1487 }
1488 }
1489 }
1490
Alan Stern2ef89192005-11-08 15:51:55 -05001491 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001494 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001495 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001496 /*
1497 * the sdev we used didn't appear in the report luns scan
1498 */
James Bottomley860dc732009-11-19 17:48:29 -05001499 __scsi_remove_device(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001500 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501}
1502
1503struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1504 uint id, uint lun, void *hostdata)
1505{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001506 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001508 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001510 if (strncmp(scsi_scan_type, "none", 4) == 0)
1511 return ERR_PTR(-ENODEV);
1512
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001513 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 if (!starget)
1515 return ERR_PTR(-ENOMEM);
Alan Sternbc4f2402010-06-17 10:41:42 -04001516 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517
Arjan van de Ven0b950672006-01-11 13:16:10 +01001518 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001519 if (!shost->async_scan)
1520 scsi_complete_async_scans();
1521
Alan Sternbc4f2402010-06-17 10:41:42 -04001522 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001523 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Alan Sternbc4f2402010-06-17 10:41:42 -04001524 scsi_autopm_put_host(shost);
1525 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001526 mutex_unlock(&shost->scan_mutex);
Alan Sternbc4f2402010-06-17 10:41:42 -04001527 scsi_autopm_put_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 scsi_target_reap(starget);
1529 put_device(&starget->dev);
1530
1531 return sdev;
1532}
1533EXPORT_SYMBOL(__scsi_add_device);
1534
James Bottomley146f7262005-09-10 12:44:09 -05001535int scsi_add_device(struct Scsi_Host *host, uint channel,
1536 uint target, uint lun)
1537{
1538 struct scsi_device *sdev =
1539 __scsi_add_device(host, channel, target, lun, NULL);
1540 if (IS_ERR(sdev))
1541 return PTR_ERR(sdev);
1542
1543 scsi_device_put(sdev);
1544 return 0;
1545}
1546EXPORT_SYMBOL(scsi_add_device);
1547
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548void scsi_rescan_device(struct device *dev)
1549{
1550 struct scsi_driver *drv;
1551
1552 if (!dev->driver)
1553 return;
1554
1555 drv = to_scsi_driver(dev->driver);
1556 if (try_module_get(drv->owner)) {
1557 if (drv->rescan)
1558 drv->rescan(dev);
1559 module_put(drv->owner);
1560 }
1561}
1562EXPORT_SYMBOL(scsi_rescan_device);
1563
Alan Sterne517d312005-07-26 10:18:45 -04001564static void __scsi_scan_target(struct device *parent, unsigned int channel,
1565 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566{
1567 struct Scsi_Host *shost = dev_to_shost(parent);
1568 int bflags = 0;
1569 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 struct scsi_target *starget;
1571
1572 if (shost->this_id == id)
1573 /*
1574 * Don't scan the host adapter
1575 */
1576 return;
1577
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 if (!starget)
1580 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001581 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 if (lun != SCAN_WILD_CARD) {
1584 /*
1585 * Scan for a specific host/chan/id/lun.
1586 */
1587 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1588 goto out_reap;
1589 }
1590
1591 /*
1592 * Scan LUN 0, if there is some response, scan further. Ideally, we
1593 * would not configure LUN 0 until all LUNs are scanned.
1594 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001595 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1596 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1597 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 /*
1599 * The REPORT LUN did not scan the target,
1600 * do a sequential scan.
1601 */
1602 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001603 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605
1606 out_reap:
Alan Sternbc4f2402010-06-17 10:41:42 -04001607 scsi_autopm_put_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 /* now determine if the target has any children at all
1609 * and if not, nuke it */
1610 scsi_target_reap(starget);
1611
1612 put_device(&starget->dev);
1613}
Alan Sterne517d312005-07-26 10:18:45 -04001614
1615/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001616 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001617 * @parent: host to scan
1618 * @channel: channel to scan
1619 * @id: target id to scan
1620 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1621 * @rescan: passed to LUN scanning routines
1622 *
1623 * Description:
1624 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1625 * and possibly all LUNs on the target id.
1626 *
1627 * First try a REPORT LUN scan, if that does not scan the target, do a
1628 * sequential scan of LUNs on the target id.
1629 **/
1630void scsi_scan_target(struct device *parent, unsigned int channel,
1631 unsigned int id, unsigned int lun, int rescan)
1632{
1633 struct Scsi_Host *shost = dev_to_shost(parent);
1634
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001635 if (strncmp(scsi_scan_type, "none", 4) == 0)
1636 return;
1637
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001638 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001639 if (!shost->async_scan)
1640 scsi_complete_async_scans();
1641
Alan Sternbc4f2402010-06-17 10:41:42 -04001642 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Alan Sterne517d312005-07-26 10:18:45 -04001643 __scsi_scan_target(parent, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001644 scsi_autopm_put_host(shost);
1645 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001646 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001647}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648EXPORT_SYMBOL(scsi_scan_target);
1649
1650static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1651 unsigned int id, unsigned int lun, int rescan)
1652{
1653 uint order_id;
1654
1655 if (id == SCAN_WILD_CARD)
1656 for (id = 0; id < shost->max_id; ++id) {
1657 /*
1658 * XXX adapter drivers when possible (FCP, iSCSI)
1659 * could modify max_id to match the current max,
1660 * not the absolute max.
1661 *
1662 * XXX add a shost id iterator, so for example,
1663 * the FC ID can be the same as a target id
1664 * without a huge overhead of sparse id's.
1665 */
1666 if (shost->reverse_ordering)
1667 /*
1668 * Scan from high to low id.
1669 */
1670 order_id = shost->max_id - id - 1;
1671 else
1672 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001673 __scsi_scan_target(&shost->shost_gendev, channel,
1674 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 }
1676 else
Alan Sterne517d312005-07-26 10:18:45 -04001677 __scsi_scan_target(&shost->shost_gendev, channel,
1678 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679}
1680
1681int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1682 unsigned int id, unsigned int lun, int rescan)
1683{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001684 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1685 "%s: <%u:%u:%u>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001686 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687
1688 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001689 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1691 return -EINVAL;
1692
Arjan van de Ven0b950672006-01-11 13:16:10 +01001693 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001694 if (!shost->async_scan)
1695 scsi_complete_async_scans();
1696
Alan Sternbc4f2402010-06-17 10:41:42 -04001697 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Mike Anderson82f29462005-06-16 11:14:33 -07001698 if (channel == SCAN_WILD_CARD)
1699 for (channel = 0; channel <= shost->max_channel;
1700 channel++)
1701 scsi_scan_channel(shost, channel, id, lun,
1702 rescan);
1703 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 scsi_scan_channel(shost, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001705 scsi_autopm_put_host(shost);
Mike Anderson82f29462005-06-16 11:14:33 -07001706 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001707 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001708
1709 return 0;
1710}
1711
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001712static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1713{
1714 struct scsi_device *sdev;
1715 shost_for_each_device(sdev, shost) {
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001716 if (!scsi_host_scan_allowed(shost) ||
1717 scsi_sysfs_add_sdev(sdev) != 0)
James Bottomley860dc732009-11-19 17:48:29 -05001718 __scsi_remove_device(sdev);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001719 }
1720}
1721
1722/**
1723 * scsi_prep_async_scan - prepare for an async scan
1724 * @shost: the host which will be scanned
1725 * Returns: a cookie to be passed to scsi_finish_async_scan()
1726 *
1727 * Tells the midlayer this host is going to do an asynchronous scan.
1728 * It reserves the host's position in the scanning list and ensures
1729 * that other asynchronous scans started after this one won't affect the
1730 * ordering of the discovered devices.
1731 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001732static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001733{
1734 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001735 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001736
1737 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1738 return NULL;
1739
1740 if (shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001741 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001742 shost->host_no);
1743 dump_stack();
1744 return NULL;
1745 }
1746
1747 data = kmalloc(sizeof(*data), GFP_KERNEL);
1748 if (!data)
1749 goto err;
1750 data->shost = scsi_host_get(shost);
1751 if (!data->shost)
1752 goto err;
1753 init_completion(&data->prev_finished);
1754
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001755 mutex_lock(&shost->scan_mutex);
1756 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001757 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001758 spin_unlock_irqrestore(shost->host_lock, flags);
1759 mutex_unlock(&shost->scan_mutex);
1760
1761 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001762 if (list_empty(&scanning_hosts))
1763 complete(&data->prev_finished);
1764 list_add_tail(&data->list, &scanning_hosts);
1765 spin_unlock(&async_scan_lock);
1766
1767 return data;
1768
1769 err:
1770 kfree(data);
1771 return NULL;
1772}
1773
1774/**
1775 * scsi_finish_async_scan - asynchronous scan has finished
1776 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1777 *
1778 * All the devices currently attached to this host have been found.
1779 * This function announces all the devices it has found to the rest
1780 * of the system.
1781 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001782static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001783{
1784 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001785 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001786
1787 if (!data)
1788 return;
1789
1790 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001791
1792 mutex_lock(&shost->scan_mutex);
1793
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001794 if (!shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001795 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001796 shost->host_no);
1797 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001798 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001799 return;
1800 }
1801
1802 wait_for_completion(&data->prev_finished);
1803
1804 scsi_sysfs_add_devices(shost);
1805
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001806 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001807 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001808 spin_unlock_irqrestore(shost->host_lock, flags);
1809
1810 mutex_unlock(&shost->scan_mutex);
1811
1812 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001813 list_del(&data->list);
1814 if (!list_empty(&scanning_hosts)) {
1815 struct async_scan_data *next = list_entry(scanning_hosts.next,
1816 struct async_scan_data, list);
1817 complete(&next->prev_finished);
1818 }
1819 spin_unlock(&async_scan_lock);
1820
1821 scsi_host_put(shost);
1822 kfree(data);
1823}
1824
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001825static void do_scsi_scan_host(struct Scsi_Host *shost)
1826{
1827 if (shost->hostt->scan_finished) {
1828 unsigned long start = jiffies;
1829 if (shost->hostt->scan_start)
1830 shost->hostt->scan_start(shost);
1831
1832 while (!shost->hostt->scan_finished(shost, jiffies - start))
1833 msleep(10);
1834 } else {
1835 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1836 SCAN_WILD_CARD, 0);
1837 }
1838}
1839
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001840static int do_scan_async(void *_data)
1841{
1842 struct async_scan_data *data = _data;
Alan Sternbc4f2402010-06-17 10:41:42 -04001843 struct Scsi_Host *shost = data->shost;
1844
1845 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001846 scsi_finish_async_scan(data);
Alan Sternbc4f2402010-06-17 10:41:42 -04001847 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001848 return 0;
1849}
1850
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851/**
1852 * scsi_scan_host - scan the given adapter
1853 * @shost: adapter to scan
1854 **/
1855void scsi_scan_host(struct Scsi_Host *shost)
1856{
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001857 struct task_struct *p;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001858 struct async_scan_data *data;
1859
1860 if (strncmp(scsi_scan_type, "none", 4) == 0)
1861 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001862 if (scsi_autopm_get_host(shost) < 0)
1863 return;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001864
1865 data = scsi_prep_async_scan(shost);
1866 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001867 do_scsi_scan_host(shost);
Alan Sternbc4f2402010-06-17 10:41:42 -04001868 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001869 return;
1870 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001871
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001872 p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
Hirofumi Nakagawa801678c2008-04-29 01:03:09 -07001873 if (IS_ERR(p))
Matthew Wilcoxa57b1fc2007-08-20 09:18:48 -06001874 do_scan_async(data);
Alan Sternbc4f2402010-06-17 10:41:42 -04001875 /* scsi_autopm_put_host(shost) is called in do_scan_async() */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876}
1877EXPORT_SYMBOL(scsi_scan_host);
1878
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879void scsi_forget_host(struct Scsi_Host *shost)
1880{
Alan Sterna64358d2005-07-26 10:27:10 -04001881 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882 unsigned long flags;
1883
Alan Sterna64358d2005-07-26 10:27:10 -04001884 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001886 list_for_each_entry(sdev, &shost->__devices, siblings) {
1887 if (sdev->sdev_state == SDEV_DEL)
1888 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001890 __scsi_remove_device(sdev);
1891 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 }
1893 spin_unlock_irqrestore(shost->host_lock, flags);
1894}
1895
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001896/**
1897 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1898 * @shost: Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 *
1900 * Lock status: None assumed.
1901 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001902 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903 *
1904 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001905 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906 * be made to look like a "pseudo-device" that points to the
1907 * HA itself.
1908 *
1909 * Note - this device is not accessible from any high-level
1910 * drivers (including generics), which is probably not
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001911 * optimal. We can add hooks later to attach.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 */
1913struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1914{
Alan Sterne517d312005-07-26 10:18:45 -04001915 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 struct scsi_target *starget;
1917
Arjan van de Ven0b950672006-01-11 13:16:10 +01001918 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001919 if (!scsi_host_scan_allowed(shost))
1920 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1922 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001923 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924
1925 sdev = scsi_alloc_sdev(starget, 0, NULL);
Alan Sternd5469112010-02-12 12:13:39 -05001926 if (sdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 sdev->borken = 0;
Alan Sternd5469112010-02-12 12:13:39 -05001928 else
James Bottomley884d25c2006-09-05 16:26:41 -05001929 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001931 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001932 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933 return sdev;
1934}
1935EXPORT_SYMBOL(scsi_get_host_dev);
1936
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001937/**
1938 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1939 * @sdev: Host device to be freed
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 *
1941 * Lock status: None assumed.
1942 *
1943 * Returns: Nothing
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944 */
1945void scsi_free_host_dev(struct scsi_device *sdev)
1946{
1947 BUG_ON(sdev->id != sdev->host->this_id);
1948
James Bottomley860dc732009-11-19 17:48:29 -05001949 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001950}
1951EXPORT_SYMBOL(scsi_free_host_dev);
1952