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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))
Dan Williamse96eb232012-07-09 19:33:45 -0700150 return 0;
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600151 /* 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);
Dan Williamse96eb232012-07-09 19:33:45 -0700182
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600183 kfree(data);
184 return 0;
185}
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187/**
188 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500189 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 * @result: area to store the result of the MODE SENSE
191 *
192 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500193 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 * Called for BLIST_KEY devices.
195 **/
James Bottomley39216032005-06-15 18:48:29 -0500196static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 unsigned char *result)
198{
199 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
200
201 printk(KERN_NOTICE "scsi: unlocking floptical drive\n");
202 scsi_cmd[0] = MODE_SENSE;
203 scsi_cmd[1] = 0;
204 scsi_cmd[2] = 0x2e;
205 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500206 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500208 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900209 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210}
211
212/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500214 * @starget: which target to allocate a &scsi_device for
215 * @lun: which lun
216 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 *
218 * Description:
219 * Allocate, initialize for io, and return a pointer to a scsi_Device.
220 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
221 * adds scsi_Device to the appropriate list.
222 *
223 * Return value:
224 * scsi_Device pointer, or NULL on failure.
225 **/
226static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
227 unsigned int lun, void *hostdata)
228{
229 struct scsi_device *sdev;
230 int display_failure_msg = 1, ret;
231 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400232 extern void scsi_evt_thread(struct work_struct *work);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200233 extern void scsi_requeue_run_queue(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Jes Sorensen24669f752006-01-16 10:31:18 -0500235 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 GFP_ATOMIC);
237 if (!sdev)
238 goto out;
239
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 sdev->vendor = scsi_null_device_strs;
241 sdev->model = scsi_null_device_strs;
242 sdev->rev = scsi_null_device_strs;
243 sdev->host = shost;
Vasu Dev4a840672009-10-22 15:46:33 -0700244 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 sdev->id = starget->id;
246 sdev->lun = lun;
247 sdev->channel = starget->channel;
248 sdev->sdev_state = SDEV_CREATED;
249 INIT_LIST_HEAD(&sdev->siblings);
250 INIT_LIST_HEAD(&sdev->same_target_siblings);
251 INIT_LIST_HEAD(&sdev->cmd_list);
252 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400253 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400255 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200256 INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 sdev->sdev_gendev.parent = get_device(&starget->dev);
259 sdev->sdev_target = starget;
260
261 /* usually NULL and set by ->slave_alloc instead */
262 sdev->hostdata = hostdata;
263
264 /* if the device needs this changing, it may do so in the
265 * slave_configure function */
266 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
267
268 /*
269 * Some low level driver could use device->type
270 */
271 sdev->type = -1;
272
273 /*
274 * Assume that the device will have handshaking problems,
275 * and then fix this field later if it turns out it
276 * doesn't
277 */
278 sdev->borken = 1;
279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 sdev->request_queue = scsi_alloc_queue(sdev);
281 if (!sdev->request_queue) {
282 /* release fn is set up in scsi_sysfs_device_initialise, so
283 * have to free and put manually here */
284 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500285 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 goto out;
287 }
Tejun Heo09ac46c2011-12-14 00:33:38 +0100288 WARN_ON_ONCE(!blk_get_queue(sdev->request_queue));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 sdev->request_queue->queuedata = sdev;
290 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
291
292 scsi_sysfs_device_initialize(sdev);
293
294 if (shost->hostt->slave_alloc) {
295 ret = shost->hostt->slave_alloc(sdev);
296 if (ret) {
297 /*
298 * if LLDD reports slave not present, don't clutter
299 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 */
301 if (ret == -ENXIO)
302 display_failure_msg = 0;
303 goto out_device_destroy;
304 }
305 }
306
307 return sdev;
308
309out_device_destroy:
James Bottomley4e6c82b2011-11-07 08:51:24 -0600310 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311out:
312 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700313 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 return NULL;
315}
316
James Bottomley643eb2d2008-03-22 22:42:27 -0500317static void scsi_target_destroy(struct scsi_target *starget)
318{
319 struct device *dev = &starget->dev;
320 struct Scsi_Host *shost = dev_to_shost(dev->parent);
321 unsigned long flags;
322
323 transport_destroy_device(dev);
324 spin_lock_irqsave(shost->host_lock, flags);
325 if (shost->hostt->target_destroy)
326 shost->hostt->target_destroy(starget);
327 list_del_init(&starget->siblings);
328 spin_unlock_irqrestore(shost->host_lock, flags);
329 put_device(dev);
330}
331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332static void scsi_target_dev_release(struct device *dev)
333{
334 struct device *parent = dev->parent;
335 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 kfree(starget);
338 put_device(parent);
339}
340
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700341static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100342 .name = "scsi_target",
343 .release = scsi_target_dev_release,
344};
345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346int scsi_is_target_device(const struct device *dev)
347{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100348 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
350EXPORT_SYMBOL(scsi_is_target_device);
351
352static struct scsi_target *__scsi_find_target(struct device *parent,
353 int channel, uint id)
354{
355 struct scsi_target *starget, *found_starget = NULL;
356 struct Scsi_Host *shost = dev_to_shost(parent);
357 /*
358 * Search for an existing target for this sdev.
359 */
360 list_for_each_entry(starget, &shost->__targets, siblings) {
361 if (starget->id == id &&
362 starget->channel == channel) {
363 found_starget = starget;
364 break;
365 }
366 }
367 if (found_starget)
368 get_device(&found_starget->dev);
369
370 return found_starget;
371}
372
James Bottomley884d25c2006-09-05 16:26:41 -0500373/**
374 * scsi_alloc_target - allocate a new or find an existing target
375 * @parent: parent of the target (need not be a scsi host)
376 * @channel: target channel number (zero if no channels)
377 * @id: target id number
378 *
379 * Return an existing target if one exists, provided it hasn't already
380 * gone into STARGET_DEL state, otherwise allocate a new target.
381 *
382 * The target is returned with an incremented reference, so the caller
383 * is responsible for both reaping and doing a last put
384 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385static struct scsi_target *scsi_alloc_target(struct device *parent,
386 int channel, uint id)
387{
388 struct Scsi_Host *shost = dev_to_shost(parent);
389 struct device *dev = NULL;
390 unsigned long flags;
391 const int size = sizeof(struct scsi_target)
392 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400393 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 struct scsi_target *found_target;
Brian King32f95792006-02-22 14:28:24 -0600395 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Jes Sorensen24669f752006-01-16 10:31:18 -0500397 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700399 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 return NULL;
401 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 dev = &starget->dev;
403 device_initialize(dev);
404 starget->reap_ref = 1;
405 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100406 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100407 dev->bus = &scsi_bus_type;
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100408 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 starget->id = id;
410 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500411 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 INIT_LIST_HEAD(&starget->siblings);
413 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500414 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500415 starget->scsi_level = SCSI_2;
Edward Gogginc53a2842009-04-09 10:02:22 -0700416 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
James Bottomleyffedb452006-02-23 14:27:18 -0600417 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 spin_lock_irqsave(shost->host_lock, flags);
419
420 found_target = __scsi_find_target(parent, channel, id);
421 if (found_target)
422 goto found;
423
424 list_add_tail(&starget->siblings, &shost->__targets);
425 spin_unlock_irqrestore(shost->host_lock, flags);
426 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500427 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500428 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600429 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500430
431 if(error) {
432 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
433 /* don't want scsi_target_reap to do the final
434 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500435 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500436 return NULL;
437 }
438 }
James Bottomley884d25c2006-09-05 16:26:41 -0500439 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 return starget;
442
443 found:
444 found_target->reap_ref++;
445 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleyffedb452006-02-23 14:27:18 -0600446 if (found_target->state != STARGET_DEL) {
Alan Stern12fb8c12010-03-18 15:41:22 -0400447 put_device(dev);
James Bottomleyffedb452006-02-23 14:27:18 -0600448 return found_target;
449 }
450 /* Unfortunately, we found a dying target; need to
451 * wait until it's dead before we can get a new one */
452 put_device(&found_target->dev);
453 flush_scheduled_work();
454 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455}
456
David Howells65f27f32006-11-22 14:55:48 +0000457static void scsi_target_reap_usercontext(struct work_struct *work)
James Bottomley65110b22006-02-14 10:48:46 -0600458{
David Howells65f27f32006-11-22 14:55:48 +0000459 struct scsi_target *starget =
460 container_of(work, struct scsi_target, ew.work);
James Bottomley863a9302005-12-15 20:01:43 -0800461
James Bottomleyffedb452006-02-23 14:27:18 -0600462 transport_remove_device(&starget->dev);
463 device_del(&starget->dev);
James Bottomley643eb2d2008-03-22 22:42:27 -0500464 scsi_target_destroy(starget);
James Bottomley863a9302005-12-15 20:01:43 -0800465}
466
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467/**
468 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 * @starget: target to be checked
470 *
471 * This is used after removing a LUN or doing a last put of the target
472 * it checks atomically that nothing is using the target and removes
473 * it if so.
474 */
475void scsi_target_reap(struct scsi_target *starget)
476{
James Bottomleyffedb452006-02-23 14:27:18 -0600477 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
478 unsigned long flags;
James Bottomley643eb2d2008-03-22 22:42:27 -0500479 enum scsi_target_state state;
Alan Sternf9e88942010-03-18 15:39:30 -0400480 int empty = 0;
James Bottomleyffedb452006-02-23 14:27:18 -0600481
482 spin_lock_irqsave(shost->host_lock, flags);
James Bottomley643eb2d2008-03-22 22:42:27 -0500483 state = starget->state;
Alan Sternf9e88942010-03-18 15:39:30 -0400484 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) {
485 empty = 1;
486 starget->state = STARGET_DEL;
487 }
James Bottomleyffedb452006-02-23 14:27:18 -0600488 spin_unlock_irqrestore(shost->host_lock, flags);
489
James Bottomley643eb2d2008-03-22 22:42:27 -0500490 if (!empty)
491 return;
492
493 BUG_ON(state == STARGET_DEL);
James Bottomley643eb2d2008-03-22 22:42:27 -0500494 if (state == STARGET_CREATED)
495 scsi_target_destroy(starget);
496 else
497 execute_in_process_context(scsi_target_reap_usercontext,
498 &starget->ew);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499}
500
501/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400502 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
503 * @s: INQUIRY result string to sanitize
504 * @len: length of the string
505 *
506 * Description:
507 * The SCSI spec says that INQUIRY vendor, product, and revision
508 * strings must consist entirely of graphic ASCII characters,
509 * padded on the right with spaces. Since not all devices obey
510 * this rule, we will replace non-graphic or non-ASCII characters
511 * with spaces. Exception: a NUL character is interpreted as a
512 * string terminator, so all the following characters are set to
513 * spaces.
514 **/
515static void sanitize_inquiry_string(unsigned char *s, int len)
516{
517 int terminated = 0;
518
519 for (; len > 0; (--len, ++s)) {
520 if (*s == 0)
521 terminated = 1;
522 if (terminated || *s < 0x20 || *s > 0x7e)
523 *s = ' ';
524 }
525}
526
527/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500529 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500531 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 * @bflags: store any bflags found here
533 *
534 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500535 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 *
James Bottomley39216032005-06-15 18:48:29 -0500537 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100539 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400541static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500542 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
545 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
546 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500547 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 struct scsi_sense_hdr sshdr;
549
550 *bflags = 0;
551
552 /* Perform up to 3 passes. The first pass uses a conservative
553 * transfer length of 36 unless sdev->inquiry_len specifies a
554 * different value. */
555 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
556 try_inquiry_len = first_inquiry_len;
557 pass = 1;
558
559 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500560 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
561 "scsi scan: INQUIRY pass %d length %d\n",
562 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
564 /* Each pass gets up to three chances to ignore Unit Attention */
565 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900566 int resid;
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 memset(scsi_cmd, 0, 6);
569 scsi_cmd[0] = INQUIRY;
570 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
572 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500573
574 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500575 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900576 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900577 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
580 "with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500581 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
James Bottomley39216032005-06-15 18:48:29 -0500583 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 /*
585 * not-ready to ready transition [asc/ascq=0x28/0x0]
586 * or power-on, reset [asc/ascq=0x29/0x0], continue.
587 * INQUIRY should not yield UNIT_ATTENTION
588 * but many buggy devices do so anyway.
589 */
James Bottomley39216032005-06-15 18:48:29 -0500590 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500591 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 if ((sshdr.sense_key == UNIT_ATTENTION) &&
593 ((sshdr.asc == 0x28) ||
594 (sshdr.asc == 0x29)) &&
595 (sshdr.ascq == 0))
596 continue;
597 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900598 } else {
599 /*
600 * if nothing was transferred, we try
601 * again. It's a workaround for some USB
602 * devices.
603 */
604 if (resid == try_inquiry_len)
605 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 }
607 break;
608 }
609
James Bottomley39216032005-06-15 18:48:29 -0500610 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400611 sanitize_inquiry_string(&inq_result[8], 8);
612 sanitize_inquiry_string(&inq_result[16], 16);
613 sanitize_inquiry_string(&inq_result[32], 4);
614
615 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 if (response_len > 255)
617 response_len = first_inquiry_len; /* sanity */
618
619 /*
620 * Get any flags for this device.
621 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100622 * XXX add a bflags to scsi_device, and replace the
623 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 * need not be passed as an argument.
625 */
626 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
627 &inq_result[16]);
628
629 /* When the first pass succeeds we gain information about
630 * what larger transfer lengths might work. */
631 if (pass == 1) {
632 if (BLIST_INQUIRY_36 & *bflags)
633 next_inquiry_len = 36;
634 else if (BLIST_INQUIRY_58 & *bflags)
635 next_inquiry_len = 58;
636 else if (sdev->inquiry_len)
637 next_inquiry_len = sdev->inquiry_len;
638 else
639 next_inquiry_len = response_len;
640
641 /* If more data is available perform the second pass */
642 if (next_inquiry_len > try_inquiry_len) {
643 try_inquiry_len = next_inquiry_len;
644 pass = 2;
645 goto next_pass;
646 }
647 }
648
649 } else if (pass == 2) {
650 printk(KERN_INFO "scsi scan: %d byte inquiry failed. "
651 "Consider BLIST_INQUIRY_36 for this device\n",
652 try_inquiry_len);
653
654 /* If this pass failed, the third pass goes back and transfers
655 * the same amount as we successfully got in the first pass. */
656 try_inquiry_len = first_inquiry_len;
657 pass = 3;
658 goto next_pass;
659 }
660
661 /* If the last transfer attempt got an error, assume the
662 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500663 if (result)
664 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
666 /* Don't report any more data than the device says is valid */
667 sdev->inquiry_len = min(try_inquiry_len, response_len);
668
669 /*
670 * XXX Abort if the response length is less than 36? If less than
671 * 32, the lookup of the device flags (above) could be invalid,
672 * and it would be possible to take an incorrect action - we do
673 * not want to hang because of a short INQUIRY. On the flip side,
674 * if the device is spun down or becoming ready (and so it gives a
675 * short INQUIRY), an abort here prevents any further use of the
676 * device, including spin up.
677 *
Alan Sterne423ee32007-02-16 01:46:38 -0800678 * On the whole, the best approach seems to be to assume the first
679 * 36 bytes are valid no matter what the device says. That's
680 * better than copying < 36 bytes to the inquiry-result buffer
681 * and displaying garbage for the Vendor, Product, or Revision
682 * strings.
683 */
684 if (sdev->inquiry_len < 36) {
685 printk(KERN_INFO "scsi scan: INQUIRY result too short (%d),"
686 " using 36\n", sdev->inquiry_len);
687 sdev->inquiry_len = 36;
688 }
689
690 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 * Related to the above issue:
692 *
693 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
694 * and if not ready, sent a START_STOP to start (maybe spin up) and
695 * then send the INQUIRY again, since the INQUIRY can change after
696 * a device is initialized.
697 *
698 * Ideally, start a device if explicitly asked to do so. This
699 * assumes that a device is spun up on power on, spun down on
700 * request, and then spun up on request.
701 */
702
703 /*
704 * The scanning code needs to know the scsi_level, even if no
705 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
706 * non-zero LUNs can be scanned.
707 */
708 sdev->scsi_level = inq_result[2] & 0x07;
709 if (sdev->scsi_level >= 2 ||
710 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
711 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500712 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
James Bottomley39216032005-06-15 18:48:29 -0500714 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715}
716
717/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100718 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600719 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 * @inq_result: holds the result of a previous INQUIRY to the LUN
721 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600722 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 *
724 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600725 * Initialize the scsi_device @sdev. Optionally set fields based
726 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 *
728 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100729 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
730 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400732static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600733 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734{
James Bottomley6f4267e2008-08-22 16:53:31 -0500735 int ret;
736
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 /*
738 * XXX do not save the inquiry, since it can change underneath us,
739 * save just vendor/model/rev.
740 *
741 * Rather than save it and have an ioctl that retrieves the saved
742 * value, have an ioctl that executes the same INQUIRY code used
743 * in scsi_probe_lun, let user level programs doing INQUIRY
744 * scanning run at their own risk, or supply a user level program
745 * that can correctly scan.
746 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747
Alan Stern09123d22006-11-10 12:27:57 -0800748 /*
749 * Copy at least 36 bytes of INQUIRY data, so that we don't
750 * dereference unallocated memory when accessing the Vendor,
751 * Product, and Revision strings. Badly behaved devices may set
752 * the INQUIRY Additional Length byte to a small value, indicating
753 * these strings are invalid, but often they contain plausible data
754 * nonetheless. It doesn't matter if the device sent < 36 bytes
755 * total, since scsi_probe_lun() initializes inq_result with 0s.
756 */
757 sdev->inquiry = kmemdup(inq_result,
758 max_t(size_t, sdev->inquiry_len, 36),
759 GFP_ATOMIC);
760 if (sdev->inquiry == NULL)
761 return SCSI_SCAN_NO_RESPONSE;
762
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 sdev->vendor = (char *) (sdev->inquiry + 8);
764 sdev->model = (char *) (sdev->inquiry + 16);
765 sdev->rev = (char *) (sdev->inquiry + 32);
766
James Bottomley14216562012-07-25 23:55:55 +0400767 if (strncmp(sdev->vendor, "ATA ", 8) == 0) {
768 /*
769 * sata emulation layer device. This is a hack to work around
770 * the SATL power management specifications which state that
771 * when the SATL detects the device has gone into standby
772 * mode, it shall respond with NOT READY.
773 */
774 sdev->allow_restart = 1;
775 }
776
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600778 sdev->type = TYPE_ROM;
779 sdev->removable = 1;
780 } else {
781 sdev->type = (inq_result[0] & 0x1f);
782 sdev->removable = (inq_result[1] & 0x80) >> 7;
783 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
Matthew Wilcox6d877682007-07-11 12:54:55 -0600785 switch (sdev->type) {
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600786 case TYPE_RBC:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 case TYPE_TAPE:
788 case TYPE_DISK:
789 case TYPE_PRINTER:
790 case TYPE_MOD:
791 case TYPE_PROCESSOR:
792 case TYPE_SCANNER:
793 case TYPE_MEDIUM_CHANGER:
794 case TYPE_ENCLOSURE:
795 case TYPE_COMM:
James Bottomley4d7db042006-03-31 20:07:45 -0600796 case TYPE_RAID:
Boaz Harrosh82443a52009-01-25 16:51:33 +0200797 case TYPE_OSD:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 sdev->writeable = 1;
799 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 case TYPE_ROM:
James Bottomleyddaf6fc2006-12-13 10:10:40 -0600801 case TYPE_WORM:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 sdev->writeable = 0;
803 break;
804 default:
805 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type);
806 }
807
Matthew Wilcox6d877682007-07-11 12:54:55 -0600808 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
809 /* RBC and MMC devices can return SCSI-3 compliance and yet
810 * still not support REPORT LUNS, so make them act as
811 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
812 * specifically set */
813 if ((*bflags & BLIST_REPORTLUN2) == 0)
814 *bflags |= BLIST_NOREPORTLUN;
815 }
816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 /*
818 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
819 * spec says: The device server is capable of supporting the
820 * specified peripheral device type on this logical unit. However,
821 * the physical device is not currently connected to this logical
822 * unit.
823 *
824 * The above is vague, as it implies that we could treat 001 and
825 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100826 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 *
828 * Don't set the device offline here; rather let the upper
829 * level drivers eval the PQ to decide whether they should
830 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
831 */
832
833 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834 sdev->lockable = sdev->removable;
835 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
836
Matthew Wilcox6d877682007-07-11 12:54:55 -0600837 if (sdev->scsi_level >= SCSI_3 ||
838 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 sdev->ppr = 1;
840 if (inq_result[7] & 0x60)
841 sdev->wdtr = 1;
842 if (inq_result[7] & 0x10)
843 sdev->sdtr = 1;
844
James Bottomley19ac0db2006-08-06 18:15:22 -0500845 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600846 "ANSI: %d%s\n", scsi_device_type(sdev->type),
847 sdev->vendor, sdev->model, sdev->rev,
848 sdev->inq_periph_qual, inq_result[2] & 0x07,
849 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
850
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
852 !(*bflags & BLIST_NOTQ))
853 sdev->tagged_supported = 1;
Matthew Wilcox6d877682007-07-11 12:54:55 -0600854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 /*
856 * Some devices (Texel CD ROM drives) have handshaking problems
857 * when used with the Seagate controllers. borken is initialized
858 * to 1, and then set it to 0 here.
859 */
860 if ((*bflags & BLIST_BORKEN) == 0)
861 sdev->borken = 0;
862
Matthew Wilcox6d877682007-07-11 12:54:55 -0600863 if (*bflags & BLIST_NO_ULD_ATTACH)
864 sdev->no_uld_attach = 1;
865
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 /*
867 * Apparently some really broken devices (contrary to the SCSI
868 * standards) need to be selected without asserting ATN
869 */
870 if (*bflags & BLIST_SELECT_NO_ATN)
871 sdev->select_no_atn = 1;
872
873 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600874 * Maximum 512 sector transfer length
875 * broken RA4x00 Compaq Disk Array
876 */
877 if (*bflags & BLIST_MAX_512)
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500878 blk_queue_max_hw_sectors(sdev->request_queue, 512);
James Bottomley4d7db042006-03-31 20:07:45 -0600879
880 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 * Some devices may not want to have a start command automatically
882 * issued when a device is added.
883 */
884 if (*bflags & BLIST_NOSTARTONADD)
885 sdev->no_start_on_add = 1;
886
887 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500888 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 sdev->use_10_for_rw = 1;
891
892 if (*bflags & BLIST_MS_SKIP_PAGE_08)
893 sdev->skip_ms_page_8 = 1;
894
895 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
896 sdev->skip_ms_page_3f = 1;
897
898 if (*bflags & BLIST_USE_10_BYTE_MS)
899 sdev->use_10_for_ms = 1;
900
901 /* set the device running here so that slave configure
902 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500903 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
904 if (ret) {
905 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
906
907 if (ret) {
908 sdev_printk(KERN_ERR, sdev,
909 "in wrong state %s to complete scan\n",
910 scsi_device_state_name(sdev->sdev_state));
911 return SCSI_SCAN_NO_RESPONSE;
912 }
913 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914
915 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
916 sdev->use_192_bytes_for_3f = 1;
917
918 if (*bflags & BLIST_NOT_LOCKABLE)
919 sdev->lockable = 0;
920
921 if (*bflags & BLIST_RETRY_HWERROR)
922 sdev->retry_hwerror = 1;
923
924 transport_configure_device(&sdev->sdev_gendev);
925
Christoph Hellwig93805092006-02-17 12:11:29 +0100926 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500927 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100928 if (ret) {
929 /*
930 * if LLDD reports slave not present, don't clutter
931 * console with alloc failure messages
932 */
933 if (ret != -ENXIO) {
934 sdev_printk(KERN_ERR, sdev,
935 "failed to configure device\n");
936 }
937 return SCSI_SCAN_NO_RESPONSE;
938 }
939 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
Vasu Dev4a840672009-10-22 15:46:33 -0700941 sdev->max_queue_depth = sdev->queue_depth;
942
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 /*
944 * Ok, the device is now all set up, we can
945 * register it and tell the rest of the kernel
946 * about it.
947 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600948 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700949 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951 return SCSI_SCAN_LUN_PRESENT;
952}
953
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700954#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200955/**
Rob Landleyeb448202007-11-03 13:30:39 -0500956 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200957 * @buf: Output buffer with at least end-first+1 bytes of space
958 * @inq: Inquiry buffer (input)
959 * @first: Offset of string into inq
960 * @end: Index after last character in inq
961 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700962static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200963 unsigned first, unsigned end)
964{
965 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700966
967 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
968 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +0200969 buf[idx] = inq[idx+first];
970 term = idx+1;
971 } else {
972 buf[idx] = ' ';
973 }
974 }
975 buf[term] = 0;
976 return buf;
977}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -0700978#endif
James Bottomley6f3a2022005-09-22 20:33:28 -0500979
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980/**
981 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
982 * @starget: pointer to target device structure
983 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -0500985 * @sdevp: probe the LUN corresponding to this scsi_device
986 * @rescan: if nonzero skip some code only needed on first scan
987 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 *
989 * Description:
990 * Call scsi_probe_lun, if a LUN with an attached device is found,
991 * allocate and set it up by calling scsi_add_lun.
992 *
993 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100994 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
996 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100997 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 **/
999static int scsi_probe_and_add_lun(struct scsi_target *starget,
1000 uint lun, int *bflagsp,
1001 struct scsi_device **sdevp, int rescan,
1002 void *hostdata)
1003{
1004 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001006 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1008
1009 /*
1010 * The rescan flag is used as an optimization, the first scan of a
1011 * host adapter calls into here with rescan == 0.
1012 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001013 sdev = scsi_device_lookup_by_target(starget, lun);
1014 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001015 if (rescan || !scsi_device_created(sdev)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1017 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001018 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 if (sdevp)
1020 *sdevp = sdev;
1021 else
1022 scsi_device_put(sdev);
1023
1024 if (bflagsp)
1025 *bflagsp = scsi_get_device_flags(sdev,
1026 sdev->vendor,
1027 sdev->model);
1028 return SCSI_SCAN_LUN_PRESENT;
1029 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001030 scsi_device_put(sdev);
1031 } else
1032 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 if (!sdev)
1034 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001035
1036 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001037 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001039 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
James Bottomley39216032005-06-15 18:48:29 -05001041 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 goto out_free_result;
1043
Kurt Garloff4186ab12006-04-03 15:16:48 +02001044 if (bflagsp)
1045 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 /*
1047 * result contains valid SCSI INQUIRY data.
1048 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001049 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 /*
1051 * For a Peripheral qualifier 3 (011b), the SCSI
1052 * spec says: The device server is not capable of
1053 * supporting a physical device on this logical
1054 * unit.
1055 *
1056 * For disks, this implies that there is no
1057 * logical disk configured at sdev->lun, but there
1058 * is a target id responding.
1059 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001060 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1061 " peripheral qualifier of 3, device not"
1062 " added\n"))
1063 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001064 SCSI_LOG_SCAN_BUS(1, {
1065 unsigned char vend[9];
1066 unsigned char mod[17];
1067
1068 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001069 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001070 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001071 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001072 scsi_inq_str(mod, result, 16, 32));
1073 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001074
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001075 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001076
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 res = SCSI_SCAN_TARGET_PRESENT;
1078 goto out_free_result;
1079 }
1080
Alan Stern1bfc5d92006-02-09 15:26:18 -05001081 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001082 * Some targets may set slight variations of PQ and PDT to signal
1083 * that no LUN is present, so don't add sdev in these cases.
1084 * Two specific examples are:
1085 * 1) NetApp targets: return PQ=1, PDT=0x1f
1086 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1087 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1088 *
1089 * References:
1090 * 1) SCSI SPC-3, pp. 145-146
1091 * PQ=1: "A peripheral device having the specified peripheral
1092 * device type is not connected to this logical unit. However, the
1093 * device server is capable of supporting the specified peripheral
1094 * device type on this logical unit."
1095 * PDT=0x1f: "Unknown or no device type"
1096 * 2) USB UFI 1.0, p. 20
1097 * PDT=00h Direct-access device (floppy)
1098 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001099 */
dave wysochanski84961f22006-08-09 14:56:32 -04001100 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001101 (result[0] & 0x1f) == 0x1f &&
1102 !scsi_is_wlun(lun)) {
Alan Stern1bfc5d92006-02-09 15:26:18 -05001103 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO
1104 "scsi scan: peripheral device type"
1105 " of 31, no device added\n"));
1106 res = SCSI_SCAN_TARGET_PRESENT;
1107 goto out_free_result;
1108 }
1109
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001110 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 if (res == SCSI_SCAN_LUN_PRESENT) {
1112 if (bflags & BLIST_KEY) {
1113 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001114 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 }
1117
1118 out_free_result:
1119 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 out_free_sdev:
1121 if (res == SCSI_SCAN_LUN_PRESENT) {
1122 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001123 if (scsi_device_get(sdev) == 0) {
1124 *sdevp = sdev;
1125 } else {
1126 __scsi_remove_device(sdev);
1127 res = SCSI_SCAN_NO_RESPONSE;
1128 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001130 } else
James Bottomley860dc732009-11-19 17:48:29 -05001131 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 out:
1133 return res;
1134}
1135
1136/**
1137 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1138 * @starget: pointer to target structure to scan
1139 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001140 * @scsi_level: Which version of the standard does this device adhere to
1141 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 *
1143 * Description:
1144 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1145 * scanned) to some maximum lun until a LUN is found with no device
1146 * attached. Use the bflags to figure out any oddities.
1147 *
1148 * Modifies sdevscan->lun.
1149 **/
1150static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001151 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152{
1153 unsigned int sparse_lun, lun, max_dev_lun;
1154 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1155
1156 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of"
Kay Sievers71610f52008-12-03 22:41:36 +01001157 "%s\n", dev_name(&starget->dev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158
1159 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1160 /*
1161 * If this device is known to support sparse multiple units,
1162 * override the other settings, and scan all of them. Normally,
1163 * SCSI-3 devices should be scanned via the REPORT LUNS.
1164 */
1165 if (bflags & BLIST_SPARSELUN) {
1166 max_dev_lun = shost->max_lun;
1167 sparse_lun = 1;
1168 } else
1169 sparse_lun = 0;
1170
1171 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 * If less than SCSI_1_CSS, and no special lun scaning, stop
1173 * scanning; this matches 2.4 behaviour, but could just be a bug
1174 * (to continue scanning a SCSI_1_CSS device).
1175 *
1176 * This test is broken. We might not have any device on lun0 for
1177 * a sparselun device, and if that's the case then how would we
1178 * know the real scsi_level, eh? It might make sense to just not
1179 * scan any SCSI_1 device for non-0 luns, but that check would best
1180 * go into scsi_alloc_sdev() and just have it return null when asked
1181 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1182 *
1183 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1184 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1185 == 0))
1186 return;
1187 */
1188 /*
1189 * If this device is known to support multiple units, override
1190 * the other settings, and scan all of them.
1191 */
1192 if (bflags & BLIST_FORCELUN)
1193 max_dev_lun = shost->max_lun;
1194 /*
1195 * REGAL CDC-4X: avoid hang after LUN 4
1196 */
1197 if (bflags & BLIST_MAX5LUN)
1198 max_dev_lun = min(5U, max_dev_lun);
1199 /*
1200 * Do not scan SCSI-2 or lower device past LUN 7, unless
1201 * BLIST_LARGELUN.
1202 */
1203 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1204 max_dev_lun = min(8U, max_dev_lun);
1205
1206 /*
1207 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1208 * until we reach the max, or no LUN is found and we are not
1209 * sparse_lun.
1210 */
1211 for (lun = 1; lun < max_dev_lun; ++lun)
1212 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1213 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1214 !sparse_lun)
1215 return;
1216}
1217
1218/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001219 * scsilun_to_int - convert a scsi_lun to an int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 * @scsilun: struct scsi_lun to be converted.
1221 *
1222 * Description:
1223 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered
1224 * integer, and return the result. The caller must check for
1225 * truncation before using this function.
1226 *
1227 * Notes:
1228 * The struct scsi_lun is assumed to be four levels, with each level
1229 * effectively containing a SCSI byte-ordered (big endian) short; the
1230 * addressing bits of each level are ignored (the highest two bits).
1231 * For a description of the LUN format, post SCSI-3 see the SCSI
1232 * Architecture Model, for SCSI-3 see the SCSI Controller Commands.
1233 *
1234 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns
1235 * the integer: 0x0b030a04
1236 **/
Christof Schmitt462b7852007-06-19 10:25:30 +02001237int scsilun_to_int(struct scsi_lun *scsilun)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238{
1239 int i;
1240 unsigned int lun;
1241
1242 lun = 0;
1243 for (i = 0; i < sizeof(lun); i += 2)
1244 lun = lun | (((scsilun->scsi_lun[i] << 8) |
1245 scsilun->scsi_lun[i + 1]) << (i * 8));
1246 return lun;
1247}
Christof Schmitt462b7852007-06-19 10:25:30 +02001248EXPORT_SYMBOL(scsilun_to_int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
1250/**
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001251 * int_to_scsilun - reverts an int into a scsi_lun
Rob Landleyeb448202007-11-03 13:30:39 -05001252 * @lun: integer to be reverted
James.Smart@Emulex.Com2f4701d2005-07-13 22:05:03 -04001253 * @scsilun: struct scsi_lun to be set.
1254 *
1255 * Description:
1256 * Reverts the functionality of the scsilun_to_int, which packed
1257 * an 8-byte lun value into an int. This routine unpacks the int
1258 * back into the lun value.
1259 * Note: the scsilun_to_int() routine does not truly handle all
1260 * 8bytes of the lun value. This functions restores only as much
1261 * as was set by the routine.
1262 *
1263 * Notes:
1264 * Given an integer : 0x0b030a04, this function returns a
1265 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00
1266 *
1267 **/
1268void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun)
1269{
1270 int i;
1271
1272 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun));
1273
1274 for (i = 0; i < sizeof(lun); i += 2) {
1275 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF;
1276 scsilun->scsi_lun[i+1] = lun & 0xFF;
1277 lun = lun >> 16;
1278 }
1279}
1280EXPORT_SYMBOL(int_to_scsilun);
1281
1282/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001284 * @starget: which target
1285 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1286 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 *
1288 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001289 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1290 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 *
Rob Landleyeb448202007-11-03 13:30:39 -05001292 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1293 * LUNs even if it's older than SCSI-3.
1294 * If BLIST_NOREPORTLUN is set, return 1 always.
1295 * If BLIST_NOLUN is set, return 0 always.
Alan Stern09b6b512012-01-10 13:43:30 -05001296 * If starget->no_report_luns is set, return 1 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297 *
1298 * Return:
1299 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001300 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001302static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 int rescan)
1304{
1305 char devname[64];
1306 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1307 unsigned int length;
1308 unsigned int lun;
1309 unsigned int num_luns;
1310 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001311 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 u8 *data;
1314 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001315 struct scsi_device *sdev;
1316 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001317 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318
1319 /*
1320 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1321 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1322 * support more than 8 LUNs.
Alan Stern09b6b512012-01-10 13:43:30 -05001323 * Don't attempt if the target doesn't support REPORT LUNS.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 */
James Bottomley4d7db042006-03-31 20:07:45 -06001325 if (bflags & BLIST_NOREPORTLUN)
1326 return 1;
1327 if (starget->scsi_level < SCSI_2 &&
1328 starget->scsi_level != SCSI_UNKNOWN)
1329 return 1;
1330 if (starget->scsi_level < SCSI_3 &&
1331 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 return 1;
1333 if (bflags & BLIST_NOLUN)
1334 return 0;
Alan Stern09b6b512012-01-10 13:43:30 -05001335 if (starget->no_report_luns)
1336 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
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;
Alan Stern75f8ee82010-02-12 12:13:31 -05001342 if (scsi_device_get(sdev)) {
1343 __scsi_remove_device(sdev);
James Bottomley6f3a2022005-09-22 20:33:28 -05001344 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001345 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001346 }
1347
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001349 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350
1351 /*
1352 * Allocate enough to hold the header (the same size as one scsi_lun)
1353 * plus the max number of luns we are requesting.
1354 *
1355 * Reallocating and trying again (with the exact amount we need)
1356 * would be nice, but then we need to somehow limit the size
1357 * allocated based on the available memory and the limits of
1358 * kmalloc - we don't want a kmalloc() failure of a huge value to
1359 * prevent us from finding any LUNs on this target.
1360 */
1361 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun);
1362 lun_data = kmalloc(length, GFP_ATOMIC |
1363 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001364 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001365 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001366 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001367 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
1369 scsi_cmd[0] = REPORT_LUNS;
1370
1371 /*
1372 * bytes 1 - 5: reserved, set to zero.
1373 */
1374 memset(&scsi_cmd[1], 0, 5);
1375
1376 /*
1377 * bytes 6 - 9: length of the command.
1378 */
1379 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff;
1380 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff;
1381 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff;
1382 scsi_cmd[9] = (unsigned char) length & 0xff;
1383
1384 scsi_cmd[10] = 0; /* reserved */
1385 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386
1387 /*
1388 * We can get a UNIT ATTENTION, for example a power on/reset, so
1389 * retry a few times (like sd.c does for TEST UNIT READY).
1390 * Experience shows some combinations of adapter/devices get at
1391 * least two power on/resets.
1392 *
1393 * Illegal requests (for devices that do not support REPORT LUNS)
1394 * should come through as a check condition, and will not generate
1395 * a retry.
1396 */
1397 for (retries = 0; retries < 3; retries++) {
1398 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending"
1399 " REPORT LUNS to %s (try %d)\n", devname,
1400 retries));
James Bottomley39216032005-06-15 18:48:29 -05001401
James Bottomley39216032005-06-15 18:48:29 -05001402 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001403 lun_data, length, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001404 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001405
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
James Bottomley39216032005-06-15 18:48:29 -05001407 " %s (try %d) result 0x%x\n", result
1408 ? "failed" : "successful", retries, result));
1409 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001411 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 if (sshdr.sense_key != UNIT_ATTENTION)
1413 break;
1414 }
1415 }
1416
James Bottomley39216032005-06-15 18:48:29 -05001417 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 /*
1419 * The device probably does not support a REPORT LUN command
1420 */
Alan Stern2ef89192005-11-08 15:51:55 -05001421 ret = 1;
1422 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425 /*
1426 * Get the length from the first four bytes of lun_data.
1427 */
1428 data = (u8 *) lun_data->scsi_lun;
1429 length = ((data[0] << 24) | (data[1] << 16) |
1430 (data[2] << 8) | (data[3] << 0));
1431
1432 num_luns = (length / sizeof(struct scsi_lun));
1433 if (num_luns > max_scsi_report_luns) {
1434 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)"
1435 " of %d luns reported, try increasing"
1436 " max_scsi_report_luns.\n", devname,
1437 max_scsi_report_luns, num_luns);
1438 num_luns = max_scsi_report_luns;
1439 }
1440
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001441 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1442 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
1444 /*
1445 * Scan the luns in lun_data. The entry at offset 0 is really
1446 * the header, so start at 1 and go up to and including num_luns.
1447 */
1448 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1449 lun = scsilun_to_int(lunp);
1450
1451 /*
1452 * Check if the unused part of lunp is non-zero, and so
1453 * does not fit in lun.
1454 */
1455 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) {
1456 int i;
1457
1458 /*
1459 * Output an error displaying the LUN in byte order,
1460 * this differs from what linux would print for the
1461 * integer LUN value.
1462 */
1463 printk(KERN_WARNING "scsi: %s lun 0x", devname);
1464 data = (char *)lunp->scsi_lun;
1465 for (i = 0; i < sizeof(struct scsi_lun); i++)
1466 printk("%02x", data[i]);
1467 printk(" has a LUN larger than currently supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 } else if (lun > sdev->host->max_lun) {
1469 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger"
1470 " than allowed by the host adapter\n",
1471 devname, lun);
1472 } else {
1473 int res;
1474
1475 res = scsi_probe_and_add_lun(starget,
1476 lun, NULL, NULL, rescan, NULL);
1477 if (res == SCSI_SCAN_NO_RESPONSE) {
1478 /*
1479 * Got some results, but now none, abort.
1480 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001481 sdev_printk(KERN_ERR, sdev,
1482 "Unexpected response"
1483 " from lun %d while scanning, scan"
1484 " aborted\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485 break;
1486 }
1487 }
1488 }
1489
Alan Stern2ef89192005-11-08 15:51:55 -05001490 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001493 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001494 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001495 /*
1496 * the sdev we used didn't appear in the report luns scan
1497 */
James Bottomley860dc732009-11-19 17:48:29 -05001498 __scsi_remove_device(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001499 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500}
1501
1502struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
1503 uint id, uint lun, void *hostdata)
1504{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001505 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001507 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001509 if (strncmp(scsi_scan_type, "none", 4) == 0)
1510 return ERR_PTR(-ENODEV);
1511
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001512 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001513 if (!starget)
1514 return ERR_PTR(-ENOMEM);
Alan Sternbc4f2402010-06-17 10:41:42 -04001515 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
Arjan van de Ven0b950672006-01-11 13:16:10 +01001517 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001518 if (!shost->async_scan)
1519 scsi_complete_async_scans();
1520
Alan Sternbc4f2402010-06-17 10:41:42 -04001521 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001522 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Alan Sternbc4f2402010-06-17 10:41:42 -04001523 scsi_autopm_put_host(shost);
1524 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001525 mutex_unlock(&shost->scan_mutex);
Alan Sternbc4f2402010-06-17 10:41:42 -04001526 scsi_autopm_put_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 scsi_target_reap(starget);
1528 put_device(&starget->dev);
1529
1530 return sdev;
1531}
1532EXPORT_SYMBOL(__scsi_add_device);
1533
James Bottomley146f7262005-09-10 12:44:09 -05001534int scsi_add_device(struct Scsi_Host *host, uint channel,
1535 uint target, uint lun)
1536{
1537 struct scsi_device *sdev =
1538 __scsi_add_device(host, channel, target, lun, NULL);
1539 if (IS_ERR(sdev))
1540 return PTR_ERR(sdev);
1541
1542 scsi_device_put(sdev);
1543 return 0;
1544}
1545EXPORT_SYMBOL(scsi_add_device);
1546
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547void scsi_rescan_device(struct device *dev)
1548{
1549 struct scsi_driver *drv;
1550
1551 if (!dev->driver)
1552 return;
1553
1554 drv = to_scsi_driver(dev->driver);
1555 if (try_module_get(drv->owner)) {
1556 if (drv->rescan)
1557 drv->rescan(dev);
1558 module_put(drv->owner);
1559 }
1560}
1561EXPORT_SYMBOL(scsi_rescan_device);
1562
Alan Sterne517d312005-07-26 10:18:45 -04001563static void __scsi_scan_target(struct device *parent, unsigned int channel,
1564 unsigned int id, unsigned int lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565{
1566 struct Scsi_Host *shost = dev_to_shost(parent);
1567 int bflags = 0;
1568 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 struct scsi_target *starget;
1570
1571 if (shost->this_id == id)
1572 /*
1573 * Don't scan the host adapter
1574 */
1575 return;
1576
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 if (!starget)
1579 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001580 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 if (lun != SCAN_WILD_CARD) {
1583 /*
1584 * Scan for a specific host/chan/id/lun.
1585 */
1586 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1587 goto out_reap;
1588 }
1589
1590 /*
1591 * Scan LUN 0, if there is some response, scan further. Ideally, we
1592 * would not configure LUN 0 until all LUNs are scanned.
1593 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001594 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1595 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1596 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 /*
1598 * The REPORT LUN did not scan the target,
1599 * do a sequential scan.
1600 */
1601 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001602 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001604
1605 out_reap:
Alan Sternbc4f2402010-06-17 10:41:42 -04001606 scsi_autopm_put_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001607 /* now determine if the target has any children at all
1608 * and if not, nuke it */
1609 scsi_target_reap(starget);
1610
1611 put_device(&starget->dev);
1612}
Alan Sterne517d312005-07-26 10:18:45 -04001613
1614/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001615 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001616 * @parent: host to scan
1617 * @channel: channel to scan
1618 * @id: target id to scan
1619 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1620 * @rescan: passed to LUN scanning routines
1621 *
1622 * Description:
1623 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1624 * and possibly all LUNs on the target id.
1625 *
1626 * First try a REPORT LUN scan, if that does not scan the target, do a
1627 * sequential scan of LUNs on the target id.
1628 **/
1629void scsi_scan_target(struct device *parent, unsigned int channel,
1630 unsigned int id, unsigned int lun, int rescan)
1631{
1632 struct Scsi_Host *shost = dev_to_shost(parent);
1633
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001634 if (strncmp(scsi_scan_type, "none", 4) == 0)
1635 return;
1636
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001637 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001638 if (!shost->async_scan)
1639 scsi_complete_async_scans();
1640
Alan Sternbc4f2402010-06-17 10:41:42 -04001641 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Alan Sterne517d312005-07-26 10:18:45 -04001642 __scsi_scan_target(parent, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001643 scsi_autopm_put_host(shost);
1644 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001645 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001646}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647EXPORT_SYMBOL(scsi_scan_target);
1648
1649static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
1650 unsigned int id, unsigned int lun, int rescan)
1651{
1652 uint order_id;
1653
1654 if (id == SCAN_WILD_CARD)
1655 for (id = 0; id < shost->max_id; ++id) {
1656 /*
1657 * XXX adapter drivers when possible (FCP, iSCSI)
1658 * could modify max_id to match the current max,
1659 * not the absolute max.
1660 *
1661 * XXX add a shost id iterator, so for example,
1662 * the FC ID can be the same as a target id
1663 * without a huge overhead of sparse id's.
1664 */
1665 if (shost->reverse_ordering)
1666 /*
1667 * Scan from high to low id.
1668 */
1669 order_id = shost->max_id - id - 1;
1670 else
1671 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001672 __scsi_scan_target(&shost->shost_gendev, channel,
1673 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 }
1675 else
Alan Sterne517d312005-07-26 10:18:45 -04001676 __scsi_scan_target(&shost->shost_gendev, channel,
1677 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678}
1679
1680int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
1681 unsigned int id, unsigned int lun, int rescan)
1682{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001683 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
1684 "%s: <%u:%u:%u>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001685 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686
1687 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001688 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
1690 return -EINVAL;
1691
Arjan van de Ven0b950672006-01-11 13:16:10 +01001692 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001693 if (!shost->async_scan)
1694 scsi_complete_async_scans();
1695
Alan Sternbc4f2402010-06-17 10:41:42 -04001696 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Mike Anderson82f29462005-06-16 11:14:33 -07001697 if (channel == SCAN_WILD_CARD)
1698 for (channel = 0; channel <= shost->max_channel;
1699 channel++)
1700 scsi_scan_channel(shost, channel, id, lun,
1701 rescan);
1702 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 scsi_scan_channel(shost, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001704 scsi_autopm_put_host(shost);
Mike Anderson82f29462005-06-16 11:14:33 -07001705 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001706 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707
1708 return 0;
1709}
1710
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001711static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1712{
1713 struct scsi_device *sdev;
1714 shost_for_each_device(sdev, shost) {
Dan Williams3b661a92012-06-21 23:47:28 -07001715 /* target removed before the device could be added */
1716 if (sdev->sdev_state == SDEV_DEL)
1717 continue;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001718 if (!scsi_host_scan_allowed(shost) ||
1719 scsi_sysfs_add_sdev(sdev) != 0)
James Bottomley860dc732009-11-19 17:48:29 -05001720 __scsi_remove_device(sdev);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001721 }
1722}
1723
1724/**
1725 * scsi_prep_async_scan - prepare for an async scan
1726 * @shost: the host which will be scanned
1727 * Returns: a cookie to be passed to scsi_finish_async_scan()
1728 *
1729 * Tells the midlayer this host is going to do an asynchronous scan.
1730 * It reserves the host's position in the scanning list and ensures
1731 * that other asynchronous scans started after this one won't affect the
1732 * ordering of the discovered devices.
1733 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001734static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001735{
1736 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001737 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001738
1739 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1740 return NULL;
1741
1742 if (shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001743 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001744 shost->host_no);
1745 dump_stack();
1746 return NULL;
1747 }
1748
1749 data = kmalloc(sizeof(*data), GFP_KERNEL);
1750 if (!data)
1751 goto err;
1752 data->shost = scsi_host_get(shost);
1753 if (!data->shost)
1754 goto err;
1755 init_completion(&data->prev_finished);
1756
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001757 mutex_lock(&shost->scan_mutex);
1758 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001759 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001760 spin_unlock_irqrestore(shost->host_lock, flags);
1761 mutex_unlock(&shost->scan_mutex);
1762
1763 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001764 if (list_empty(&scanning_hosts))
1765 complete(&data->prev_finished);
1766 list_add_tail(&data->list, &scanning_hosts);
1767 spin_unlock(&async_scan_lock);
1768
1769 return data;
1770
1771 err:
1772 kfree(data);
1773 return NULL;
1774}
1775
1776/**
1777 * scsi_finish_async_scan - asynchronous scan has finished
1778 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1779 *
1780 * All the devices currently attached to this host have been found.
1781 * This function announces all the devices it has found to the rest
1782 * of the system.
1783 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001784static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001785{
1786 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001787 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001788
1789 if (!data)
1790 return;
1791
1792 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001793
1794 mutex_lock(&shost->scan_mutex);
1795
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001796 if (!shost->async_scan) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001797 printk("%s called twice for host %d", __func__,
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001798 shost->host_no);
1799 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001800 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001801 return;
1802 }
1803
1804 wait_for_completion(&data->prev_finished);
1805
1806 scsi_sysfs_add_devices(shost);
1807
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001808 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001809 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001810 spin_unlock_irqrestore(shost->host_lock, flags);
1811
1812 mutex_unlock(&shost->scan_mutex);
1813
1814 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001815 list_del(&data->list);
1816 if (!list_empty(&scanning_hosts)) {
1817 struct async_scan_data *next = list_entry(scanning_hosts.next,
1818 struct async_scan_data, list);
1819 complete(&next->prev_finished);
1820 }
1821 spin_unlock(&async_scan_lock);
1822
Huajun Li267a6ad2012-02-12 19:59:14 +08001823 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001824 scsi_host_put(shost);
1825 kfree(data);
1826}
1827
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001828static void do_scsi_scan_host(struct Scsi_Host *shost)
1829{
1830 if (shost->hostt->scan_finished) {
1831 unsigned long start = jiffies;
1832 if (shost->hostt->scan_start)
1833 shost->hostt->scan_start(shost);
1834
1835 while (!shost->hostt->scan_finished(shost, jiffies - start))
1836 msleep(10);
1837 } else {
1838 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1839 SCAN_WILD_CARD, 0);
1840 }
1841}
1842
Dan Williams6cdd5522012-07-09 19:33:35 -07001843static void do_scan_async(void *_data, async_cookie_t c)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001844{
1845 struct async_scan_data *data = _data;
Alan Sternbc4f2402010-06-17 10:41:42 -04001846 struct Scsi_Host *shost = data->shost;
1847
1848 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001849 scsi_finish_async_scan(data);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001850}
1851
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852/**
1853 * scsi_scan_host - scan the given adapter
1854 * @shost: adapter to scan
1855 **/
1856void scsi_scan_host(struct Scsi_Host *shost)
1857{
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
Dan Williams6cdd5522012-07-09 19:33:35 -07001872 /* register with the async subsystem so wait_for_device_probe()
1873 * will flush this work
1874 */
1875 async_schedule(do_scan_async, data);
1876
Huajun Li267a6ad2012-02-12 19:59:14 +08001877 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878}
1879EXPORT_SYMBOL(scsi_scan_host);
1880
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881void scsi_forget_host(struct Scsi_Host *shost)
1882{
Alan Sterna64358d2005-07-26 10:27:10 -04001883 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 unsigned long flags;
1885
Alan Sterna64358d2005-07-26 10:27:10 -04001886 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001887 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001888 list_for_each_entry(sdev, &shost->__devices, siblings) {
1889 if (sdev->sdev_state == SDEV_DEL)
1890 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001892 __scsi_remove_device(sdev);
1893 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 }
1895 spin_unlock_irqrestore(shost->host_lock, flags);
1896}
1897
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001898/**
1899 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1900 * @shost: Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 *
1902 * Lock status: None assumed.
1903 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001904 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 *
1906 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001907 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908 * be made to look like a "pseudo-device" that points to the
1909 * HA itself.
1910 *
1911 * Note - this device is not accessible from any high-level
1912 * drivers (including generics), which is probably not
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001913 * optimal. We can add hooks later to attach.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 */
1915struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1916{
Alan Sterne517d312005-07-26 10:18:45 -04001917 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001918 struct scsi_target *starget;
1919
Arjan van de Ven0b950672006-01-11 13:16:10 +01001920 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001921 if (!scsi_host_scan_allowed(shost))
1922 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1924 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001925 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001926
1927 sdev = scsi_alloc_sdev(starget, 0, NULL);
Alan Sternd5469112010-02-12 12:13:39 -05001928 if (sdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 sdev->borken = 0;
Alan Sternd5469112010-02-12 12:13:39 -05001930 else
James Bottomley884d25c2006-09-05 16:26:41 -05001931 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001933 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001934 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001935 return sdev;
1936}
1937EXPORT_SYMBOL(scsi_get_host_dev);
1938
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001939/**
1940 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1941 * @sdev: Host device to be freed
Linus Torvalds1da177e2005-04-16 15:20:36 -07001942 *
1943 * Lock status: None assumed.
1944 *
1945 * Returns: Nothing
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 */
1947void scsi_free_host_dev(struct scsi_device *sdev)
1948{
1949 BUG_ON(sdev->id != sdev->host->this_id);
1950
James Bottomley860dc732009-11-19 17:48:29 -05001951 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952}
1953EXPORT_SYMBOL(scsi_free_host_dev);
1954