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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>
Rob Evers2a904e52014-12-16 11:01:19 -050037#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <scsi/scsi.h>
Christoph Hellwigbeb40482006-06-10 18:01:03 +020040#include <scsi/scsi_cmnd.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <scsi/scsi_device.h>
42#include <scsi/scsi_driver.h>
43#include <scsi/scsi_devinfo.h>
44#include <scsi/scsi_host.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <scsi/scsi_transport.h>
46#include <scsi/scsi_eh.h>
47
48#include "scsi_priv.h"
49#include "scsi_logging.h"
50
51#define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \
52 " SCSI scanning, some SCSI devices might not be configured\n"
53
54/*
55 * Default timeout
56 */
57#define SCSI_TIMEOUT (2*HZ)
58
59/*
Robert P. J. Day405ae7d2007-02-17 19:13:42 +010060 * Prefix values for the SCSI id's (stored in sysfs name field)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 */
62#define SCSI_UID_SER_NUM 'S'
63#define SCSI_UID_UNKNOWN 'Z'
64
65/*
66 * Return values of some of the scanning functions.
67 *
68 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this
69 * includes allocation or general failures preventing IO from being sent.
70 *
71 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available
72 * on the given LUN.
73 *
74 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a
75 * given LUN.
76 */
77#define SCSI_SCAN_NO_RESPONSE 0
78#define SCSI_SCAN_TARGET_PRESENT 1
79#define SCSI_SCAN_LUN_PRESENT 2
80
Arjan van de Ven0ad78202005-11-28 16:22:25 +010081static const char *scsi_null_device_strs = "nullnullnullnull";
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
83#define MAX_SCSI_LUNS 512
84
Hannes Reinecke1abf6352014-06-25 15:27:38 +020085static u64 max_scsi_luns = MAX_SCSI_LUNS;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Hannes Reinecke1abf6352014-06-25 15:27:38 +020087module_param_named(max_luns, max_scsi_luns, ullong, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088MODULE_PARM_DESC(max_luns,
Hannes Reinecke1abf6352014-06-25 15:27:38 +020089 "last scsi LUN (should be between 1 and 2^64-1)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Matthew Wilcox21db1882006-11-22 13:24:52 -070091#ifdef CONFIG_SCSI_SCAN_ASYNC
92#define SCSI_SCAN_TYPE_DEFAULT "async"
93#else
94#define SCSI_SCAN_TYPE_DEFAULT "sync"
95#endif
96
Dan Williams3c31b522014-04-10 15:30:35 -070097char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
Matthew Wilcox3e082a92006-09-28 15:19:20 -060098
99module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
100MODULE_PARM_DESC(scan, "sync, async or none");
101
Alan Stern14faf122009-03-12 11:08:51 -0400102static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ + 18;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Masatake YAMATO10f4b892007-09-19 22:59:16 +0900104module_param_named(inq_timeout, scsi_inq_timeout, uint, S_IRUGO|S_IWUSR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105MODULE_PARM_DESC(inq_timeout,
106 "Timeout (in seconds) waiting for devices to answer INQUIRY."
Alan Stern14faf122009-03-12 11:08:51 -0400107 " Default is 20. Some devices may need more; most need less.");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Matthew Wilcox6b7f1232007-06-26 15:18:51 -0600109/* This lock protects only this list */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600110static DEFINE_SPINLOCK(async_scan_lock);
111static LIST_HEAD(scanning_hosts);
112
113struct async_scan_data {
114 struct list_head list;
115 struct Scsi_Host *shost;
116 struct completion prev_finished;
117};
118
119/**
120 * scsi_complete_async_scans - Wait for asynchronous scans to complete
121 *
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700122 * When this function returns, any host which started scanning before
123 * this function was called will have finished its scan. Hosts which
124 * started scanning after this function was called may or may not have
125 * finished.
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600126 */
127int scsi_complete_async_scans(void)
128{
129 struct async_scan_data *data;
130
131 do {
132 if (list_empty(&scanning_hosts))
Dan Williamse96eb232012-07-09 19:33:45 -0700133 return 0;
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600134 /* If we can't get memory immediately, that's OK. Just
135 * sleep a little. Even if we never get memory, the async
136 * scans will finish eventually.
137 */
138 data = kmalloc(sizeof(*data), GFP_KERNEL);
139 if (!data)
140 msleep(1);
141 } while (!data);
142
143 data->shost = NULL;
144 init_completion(&data->prev_finished);
145
146 spin_lock(&async_scan_lock);
147 /* Check that there's still somebody else on the list */
148 if (list_empty(&scanning_hosts))
149 goto done;
150 list_add_tail(&data->list, &scanning_hosts);
151 spin_unlock(&async_scan_lock);
152
153 printk(KERN_INFO "scsi: waiting for bus probes to complete ...\n");
154 wait_for_completion(&data->prev_finished);
155
156 spin_lock(&async_scan_lock);
157 list_del(&data->list);
Matthew Wilcox8bcc2412006-12-07 19:29:27 -0700158 if (!list_empty(&scanning_hosts)) {
159 struct async_scan_data *next = list_entry(scanning_hosts.next,
160 struct async_scan_data, list);
161 complete(&next->prev_finished);
162 }
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600163 done:
164 spin_unlock(&async_scan_lock);
Dan Williamse96eb232012-07-09 19:33:45 -0700165
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600166 kfree(data);
167 return 0;
168}
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170/**
171 * scsi_unlock_floptical - unlock device via a special MODE SENSE command
James Bottomley39216032005-06-15 18:48:29 -0500172 * @sdev: scsi device to send command to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 * @result: area to store the result of the MODE SENSE
174 *
175 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500176 * Send a vendor specific MODE SENSE (not a MODE SELECT) command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 * Called for BLIST_KEY devices.
178 **/
James Bottomley39216032005-06-15 18:48:29 -0500179static void scsi_unlock_floptical(struct scsi_device *sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 unsigned char *result)
181{
182 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
183
Hannes Reinecke91921e02014-06-25 16:39:59 +0200184 sdev_printk(KERN_NOTICE, sdev, "unlocking floptical drive\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 scsi_cmd[0] = MODE_SENSE;
186 scsi_cmd[1] = 0;
187 scsi_cmd[2] = 0x2e;
188 scsi_cmd[3] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500189 scsi_cmd[4] = 0x2a; /* size */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 scsi_cmd[5] = 0;
James Bottomley39216032005-06-15 18:48:29 -0500191 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900192 SCSI_TIMEOUT, 3, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
195/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 * scsi_alloc_sdev - allocate and setup a scsi_Device
Rob Landleyeb448202007-11-03 13:30:39 -0500197 * @starget: which target to allocate a &scsi_device for
198 * @lun: which lun
199 * @hostdata: usually NULL and set by ->slave_alloc instead
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 *
201 * Description:
202 * Allocate, initialize for io, and return a pointer to a scsi_Device.
203 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and
204 * adds scsi_Device to the appropriate list.
205 *
206 * Return value:
207 * scsi_Device pointer, or NULL on failure.
208 **/
209static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +0200210 u64 lun, void *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211{
212 struct scsi_device *sdev;
213 int display_failure_msg = 1, ret;
214 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
Jeff Garzika341cd02007-10-29 17:15:22 -0400215 extern void scsi_evt_thread(struct work_struct *work);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200216 extern void scsi_requeue_run_queue(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Jes Sorensen24669f752006-01-16 10:31:18 -0500218 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 GFP_ATOMIC);
220 if (!sdev)
221 goto out;
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 sdev->vendor = scsi_null_device_strs;
224 sdev->model = scsi_null_device_strs;
225 sdev->rev = scsi_null_device_strs;
226 sdev->host = shost;
Vasu Dev4a840672009-10-22 15:46:33 -0700227 sdev->queue_ramp_up_period = SCSI_DEFAULT_RAMP_UP_PERIOD;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 sdev->id = starget->id;
229 sdev->lun = lun;
230 sdev->channel = starget->channel;
231 sdev->sdev_state = SDEV_CREATED;
232 INIT_LIST_HEAD(&sdev->siblings);
233 INIT_LIST_HEAD(&sdev->same_target_siblings);
234 INIT_LIST_HEAD(&sdev->cmd_list);
235 INIT_LIST_HEAD(&sdev->starved_entry);
Jeff Garzika341cd02007-10-29 17:15:22 -0400236 INIT_LIST_HEAD(&sdev->event_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 spin_lock_init(&sdev->list_lock);
Jeff Garzika341cd02007-10-29 17:15:22 -0400238 INIT_WORK(&sdev->event_work, scsi_evt_thread);
Jens Axboe9937a5e2011-05-17 11:04:44 +0200239 INIT_WORK(&sdev->requeue_work, scsi_requeue_run_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 sdev->sdev_gendev.parent = get_device(&starget->dev);
242 sdev->sdev_target = starget;
243
244 /* usually NULL and set by ->slave_alloc instead */
245 sdev->hostdata = hostdata;
246
247 /* if the device needs this changing, it may do so in the
248 * slave_configure function */
249 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED;
250
251 /*
252 * Some low level driver could use device->type
253 */
254 sdev->type = -1;
255
256 /*
257 * Assume that the device will have handshaking problems,
258 * and then fix this field later if it turns out it
259 * doesn't
260 */
261 sdev->borken = 1;
262
Christoph Hellwigd2852032014-01-17 12:06:53 +0100263 if (shost_use_blk_mq(shost))
264 sdev->request_queue = scsi_mq_alloc_queue(sdev);
265 else
266 sdev->request_queue = scsi_alloc_queue(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 if (!sdev->request_queue) {
268 /* release fn is set up in scsi_sysfs_device_initialise, so
269 * have to free and put manually here */
270 put_device(&starget->dev);
Dave Jones93f560892006-03-09 10:21:27 -0500271 kfree(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 goto out;
273 }
Tejun Heo09ac46c2011-12-14 00:33:38 +0100274 WARN_ON_ONCE(!blk_get_queue(sdev->request_queue));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 sdev->request_queue->queuedata = sdev;
Christoph Hellwig2ecb2042014-11-03 14:09:02 +0100276
277 if (!shost_use_blk_mq(sdev->host) &&
278 (shost->bqt || shost->hostt->use_blk_tags)) {
279 blk_queue_init_tags(sdev->request_queue,
Shaohua Liee1b6f72015-01-15 17:32:25 -0800280 sdev->host->cmd_per_lun, shost->bqt,
281 shost->hostt->tag_alloc_policy);
Christoph Hellwig2ecb2042014-11-03 14:09:02 +0100282 }
James Bottomleyef10b162015-04-26 11:52:46 -0700283 scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun ?
284 sdev->host->cmd_per_lun : 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 scsi_sysfs_device_initialize(sdev);
287
288 if (shost->hostt->slave_alloc) {
289 ret = shost->hostt->slave_alloc(sdev);
290 if (ret) {
291 /*
292 * if LLDD reports slave not present, don't clutter
293 * console with alloc failure messages
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 */
295 if (ret == -ENXIO)
296 display_failure_msg = 0;
297 goto out_device_destroy;
298 }
299 }
300
301 return sdev;
302
303out_device_destroy:
James Bottomley4e6c82b2011-11-07 08:51:24 -0600304 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305out:
306 if (display_failure_msg)
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700307 printk(ALLOC_FAILURE_MSG, __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 return NULL;
309}
310
James Bottomley643eb2d2008-03-22 22:42:27 -0500311static void scsi_target_destroy(struct scsi_target *starget)
312{
313 struct device *dev = &starget->dev;
314 struct Scsi_Host *shost = dev_to_shost(dev->parent);
315 unsigned long flags;
316
James Bottomleyf2495e22014-01-21 07:01:41 -0800317 starget->state = STARGET_DEL;
James Bottomley643eb2d2008-03-22 22:42:27 -0500318 transport_destroy_device(dev);
319 spin_lock_irqsave(shost->host_lock, flags);
320 if (shost->hostt->target_destroy)
321 shost->hostt->target_destroy(starget);
322 list_del_init(&starget->siblings);
323 spin_unlock_irqrestore(shost->host_lock, flags);
324 put_device(dev);
325}
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327static void scsi_target_dev_release(struct device *dev)
328{
329 struct device *parent = dev->parent;
330 struct scsi_target *starget = to_scsi_target(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500331
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 kfree(starget);
333 put_device(parent);
334}
335
Adrian Bunk453cd0f2008-07-03 23:47:33 -0700336static struct device_type scsi_target_type = {
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100337 .name = "scsi_target",
338 .release = scsi_target_dev_release,
339};
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341int scsi_is_target_device(const struct device *dev)
342{
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100343 return dev->type == &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
345EXPORT_SYMBOL(scsi_is_target_device);
346
347static struct scsi_target *__scsi_find_target(struct device *parent,
348 int channel, uint id)
349{
350 struct scsi_target *starget, *found_starget = NULL;
351 struct Scsi_Host *shost = dev_to_shost(parent);
352 /*
353 * Search for an existing target for this sdev.
354 */
355 list_for_each_entry(starget, &shost->__targets, siblings) {
356 if (starget->id == id &&
357 starget->channel == channel) {
358 found_starget = starget;
359 break;
360 }
361 }
362 if (found_starget)
363 get_device(&found_starget->dev);
364
365 return found_starget;
366}
367
James Bottomley884d25c2006-09-05 16:26:41 -0500368/**
James Bottomleye63ed0d2014-01-21 07:00:50 -0800369 * scsi_target_reap_ref_release - remove target from visibility
370 * @kref: the reap_ref in the target being released
371 *
372 * Called on last put of reap_ref, which is the indication that no device
373 * under this target is visible anymore, so render the target invisible in
374 * sysfs. Note: we have to be in user context here because the target reaps
375 * should be done in places where the scsi device visibility is being removed.
376 */
377static void scsi_target_reap_ref_release(struct kref *kref)
378{
379 struct scsi_target *starget
380 = container_of(kref, struct scsi_target, reap_ref);
381
James Bottomleyf2495e22014-01-21 07:01:41 -0800382 /*
383 * if we get here and the target is still in the CREATED state that
384 * means it was allocated but never made visible (because a scan
385 * turned up no LUNs), so don't call device_del() on it.
386 */
387 if (starget->state != STARGET_CREATED) {
388 transport_remove_device(&starget->dev);
389 device_del(&starget->dev);
390 }
James Bottomleye63ed0d2014-01-21 07:00:50 -0800391 scsi_target_destroy(starget);
392}
393
394static void scsi_target_reap_ref_put(struct scsi_target *starget)
395{
396 kref_put(&starget->reap_ref, scsi_target_reap_ref_release);
397}
398
399/**
James Bottomley884d25c2006-09-05 16:26:41 -0500400 * scsi_alloc_target - allocate a new or find an existing target
401 * @parent: parent of the target (need not be a scsi host)
402 * @channel: target channel number (zero if no channels)
403 * @id: target id number
404 *
405 * Return an existing target if one exists, provided it hasn't already
406 * gone into STARGET_DEL state, otherwise allocate a new target.
407 *
408 * The target is returned with an incremented reference, so the caller
409 * is responsible for both reaping and doing a last put
410 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411static struct scsi_target *scsi_alloc_target(struct device *parent,
412 int channel, uint id)
413{
414 struct Scsi_Host *shost = dev_to_shost(parent);
415 struct device *dev = NULL;
416 unsigned long flags;
417 const int size = sizeof(struct scsi_target)
418 + shost->transportt->target_size;
James.Smart@Emulex.Com5c44cd22005-06-10 22:24:30 -0400419 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 struct scsi_target *found_target;
James Bottomleye63ed0d2014-01-21 07:00:50 -0800421 int error, ref_got;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
Jes Sorensen24669f752006-01-16 10:31:18 -0500423 starget = kzalloc(size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 if (!starget) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -0700425 printk(KERN_ERR "%s: allocation failure\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 return NULL;
427 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 dev = &starget->dev;
429 device_initialize(dev);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800430 kref_init(&starget->reap_ref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 dev->parent = get_device(parent);
Kay Sievers71610f52008-12-03 22:41:36 +0100432 dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100433 dev->bus = &scsi_bus_type;
Hannes Reineckeb0ed4332008-03-18 14:32:28 +0100434 dev->type = &scsi_target_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 starget->id = id;
436 starget->channel = channel;
Mike Christief0c0a372008-08-17 15:24:38 -0500437 starget->can_queue = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 INIT_LIST_HEAD(&starget->siblings);
439 INIT_LIST_HEAD(&starget->devices);
James Bottomley643eb2d2008-03-22 22:42:27 -0500440 starget->state = STARGET_CREATED;
Alan Stern7c9d6f12007-01-08 11:12:32 -0500441 starget->scsi_level = SCSI_2;
Edward Gogginc53a2842009-04-09 10:02:22 -0700442 starget->max_target_blocked = SCSI_DEFAULT_TARGET_BLOCKED;
James Bottomleyffedb452006-02-23 14:27:18 -0600443 retry:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 spin_lock_irqsave(shost->host_lock, flags);
445
446 found_target = __scsi_find_target(parent, channel, id);
447 if (found_target)
448 goto found;
449
450 list_add_tail(&starget->siblings, &shost->__targets);
451 spin_unlock_irqrestore(shost->host_lock, flags);
452 /* allocate and add */
James Bottomleya283bd32005-05-24 12:06:38 -0500453 transport_setup_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500454 if (shost->hostt->target_alloc) {
Brian King32f95792006-02-22 14:28:24 -0600455 error = shost->hostt->target_alloc(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500456
457 if(error) {
458 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
459 /* don't want scsi_target_reap to do the final
460 * put because it will be under the host lock */
James Bottomley643eb2d2008-03-22 22:42:27 -0500461 scsi_target_destroy(starget);
James Bottomleya283bd32005-05-24 12:06:38 -0500462 return NULL;
463 }
464 }
James Bottomley884d25c2006-09-05 16:26:41 -0500465 get_device(dev);
James Bottomleya283bd32005-05-24 12:06:38 -0500466
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 return starget;
468
469 found:
James Bottomleye63ed0d2014-01-21 07:00:50 -0800470 /*
471 * release routine already fired if kref is zero, so if we can still
472 * take the reference, the target must be alive. If we can't, it must
473 * be dying and we need to wait for a new target
474 */
475 ref_got = kref_get_unless_zero(&found_target->reap_ref);
476
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 spin_unlock_irqrestore(shost->host_lock, flags);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800478 if (ref_got) {
Alan Stern12fb8c12010-03-18 15:41:22 -0400479 put_device(dev);
James Bottomleyffedb452006-02-23 14:27:18 -0600480 return found_target;
481 }
James Bottomleye63ed0d2014-01-21 07:00:50 -0800482 /*
483 * Unfortunately, we found a dying target; need to wait until it's
484 * dead before we can get a new one. There is an anomaly here. We
485 * *should* call scsi_target_reap() to balance the kref_get() of the
486 * reap_ref above. However, since the target being released, it's
487 * already invisible and the reap_ref is irrelevant. If we call
488 * scsi_target_reap() we might spuriously do another device_del() on
489 * an already invisible target.
490 */
James Bottomleyffedb452006-02-23 14:27:18 -0600491 put_device(&found_target->dev);
James Bottomleye63ed0d2014-01-21 07:00:50 -0800492 /*
493 * length of time is irrelevant here, we just want to yield the CPU
494 * for a tick to avoid busy waiting for the target to die.
495 */
496 msleep(1);
James Bottomleyffedb452006-02-23 14:27:18 -0600497 goto retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498}
499
500/**
501 * scsi_target_reap - check to see if target is in use and destroy if not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 * @starget: target to be checked
503 *
504 * This is used after removing a LUN or doing a last put of the target
505 * it checks atomically that nothing is using the target and removes
506 * it if so.
507 */
508void scsi_target_reap(struct scsi_target *starget)
509{
James Bottomleyf2495e22014-01-21 07:01:41 -0800510 /*
511 * serious problem if this triggers: STARGET_DEL is only set in the if
512 * the reap_ref drops to zero, so we're trying to do another final put
513 * on an already released kref
514 */
James Bottomleye63ed0d2014-01-21 07:00:50 -0800515 BUG_ON(starget->state == STARGET_DEL);
James Bottomleyf2495e22014-01-21 07:01:41 -0800516 scsi_target_reap_ref_put(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517}
518
519/**
Alan Sterne5b3cd42006-08-21 15:53:25 -0400520 * sanitize_inquiry_string - remove non-graphical chars from an INQUIRY result string
521 * @s: INQUIRY result string to sanitize
522 * @len: length of the string
523 *
524 * Description:
525 * The SCSI spec says that INQUIRY vendor, product, and revision
526 * strings must consist entirely of graphic ASCII characters,
527 * padded on the right with spaces. Since not all devices obey
528 * this rule, we will replace non-graphic or non-ASCII characters
529 * with spaces. Exception: a NUL character is interpreted as a
530 * string terminator, so all the following characters are set to
531 * spaces.
532 **/
533static void sanitize_inquiry_string(unsigned char *s, int len)
534{
535 int terminated = 0;
536
537 for (; len > 0; (--len, ++s)) {
538 if (*s == 0)
539 terminated = 1;
540 if (terminated || *s < 0x20 || *s > 0x7e)
541 *s = ' ';
542 }
543}
544
545/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY
James Bottomley39216032005-06-15 18:48:29 -0500547 * @sdev: scsi_device to probe
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 * @inq_result: area to store the INQUIRY result
James Bottomley39216032005-06-15 18:48:29 -0500549 * @result_len: len of inq_result
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 * @bflags: store any bflags found here
551 *
552 * Description:
James Bottomley39216032005-06-15 18:48:29 -0500553 * Probe the lun associated with @req using a standard SCSI INQUIRY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 *
James Bottomley39216032005-06-15 18:48:29 -0500555 * If the INQUIRY is successful, zero is returned and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100557 * are copied to the scsi_device any flags value is stored in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400559static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
James Bottomley39216032005-06-15 18:48:29 -0500560 int result_len, int *bflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
563 int first_inquiry_len, try_inquiry_len, next_inquiry_len;
564 int response_len = 0;
James Bottomley39216032005-06-15 18:48:29 -0500565 int pass, count, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 struct scsi_sense_hdr sshdr;
567
568 *bflags = 0;
569
570 /* Perform up to 3 passes. The first pass uses a conservative
571 * transfer length of 36 unless sdev->inquiry_len specifies a
572 * different value. */
573 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36;
574 try_inquiry_len = first_inquiry_len;
575 pass = 1;
576
577 next_pass:
James Bottomley9ccfc752005-10-02 11:45:08 -0500578 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
579 "scsi scan: INQUIRY pass %d length %d\n",
580 pass, try_inquiry_len));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
582 /* Each pass gets up to three chances to ignore Unit Attention */
583 for (count = 0; count < 3; ++count) {
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900584 int resid;
585
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 memset(scsi_cmd, 0, 6);
587 scsi_cmd[0] = INQUIRY;
588 scsi_cmd[4] = (unsigned char) try_inquiry_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
590 memset(inq_result, 0, try_inquiry_len);
James Bottomley39216032005-06-15 18:48:29 -0500591
592 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -0500593 inq_result, try_inquiry_len, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +0900594 HZ / 2 + HZ * scsi_inq_timeout, 3,
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900595 &resid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Hannes Reinecke91921e02014-06-25 16:39:59 +0200597 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
598 "scsi scan: INQUIRY %s with code 0x%x\n",
James Bottomley39216032005-06-15 18:48:29 -0500599 result ? "failed" : "successful", result));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
James Bottomley39216032005-06-15 18:48:29 -0500601 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 /*
603 * not-ready to ready transition [asc/ascq=0x28/0x0]
604 * or power-on, reset [asc/ascq=0x29/0x0], continue.
605 * INQUIRY should not yield UNIT_ATTENTION
606 * but many buggy devices do so anyway.
607 */
James Bottomley39216032005-06-15 18:48:29 -0500608 if ((driver_byte(result) & DRIVER_SENSE) &&
James Bottomleyea73a9f2005-08-28 11:33:52 -0500609 scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 if ((sshdr.sense_key == UNIT_ATTENTION) &&
611 ((sshdr.asc == 0x28) ||
612 (sshdr.asc == 0x29)) &&
613 (sshdr.ascq == 0))
614 continue;
615 }
FUJITA Tomonori5cd3bbf2008-12-05 11:21:46 +0900616 } else {
617 /*
618 * if nothing was transferred, we try
619 * again. It's a workaround for some USB
620 * devices.
621 */
622 if (resid == try_inquiry_len)
623 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 }
625 break;
626 }
627
James Bottomley39216032005-06-15 18:48:29 -0500628 if (result == 0) {
Alan Sterne5b3cd42006-08-21 15:53:25 -0400629 sanitize_inquiry_string(&inq_result[8], 8);
630 sanitize_inquiry_string(&inq_result[16], 16);
631 sanitize_inquiry_string(&inq_result[32], 4);
632
633 response_len = inq_result[4] + 5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 if (response_len > 255)
635 response_len = first_inquiry_len; /* sanity */
636
637 /*
638 * Get any flags for this device.
639 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100640 * XXX add a bflags to scsi_device, and replace the
641 * corresponding bit fields in scsi_device, so bflags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 * need not be passed as an argument.
643 */
644 *bflags = scsi_get_device_flags(sdev, &inq_result[8],
645 &inq_result[16]);
646
647 /* When the first pass succeeds we gain information about
648 * what larger transfer lengths might work. */
649 if (pass == 1) {
650 if (BLIST_INQUIRY_36 & *bflags)
651 next_inquiry_len = 36;
652 else if (BLIST_INQUIRY_58 & *bflags)
653 next_inquiry_len = 58;
654 else if (sdev->inquiry_len)
655 next_inquiry_len = sdev->inquiry_len;
656 else
657 next_inquiry_len = response_len;
658
659 /* If more data is available perform the second pass */
660 if (next_inquiry_len > try_inquiry_len) {
661 try_inquiry_len = next_inquiry_len;
662 pass = 2;
663 goto next_pass;
664 }
665 }
666
667 } else if (pass == 2) {
Hannes Reinecke91921e02014-06-25 16:39:59 +0200668 sdev_printk(KERN_INFO, sdev,
669 "scsi scan: %d byte inquiry failed. "
670 "Consider BLIST_INQUIRY_36 for this device\n",
671 try_inquiry_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
673 /* If this pass failed, the third pass goes back and transfers
674 * the same amount as we successfully got in the first pass. */
675 try_inquiry_len = first_inquiry_len;
676 pass = 3;
677 goto next_pass;
678 }
679
680 /* If the last transfer attempt got an error, assume the
681 * peripheral doesn't exist or is dead. */
James Bottomley39216032005-06-15 18:48:29 -0500682 if (result)
683 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684
685 /* Don't report any more data than the device says is valid */
686 sdev->inquiry_len = min(try_inquiry_len, response_len);
687
688 /*
689 * XXX Abort if the response length is less than 36? If less than
690 * 32, the lookup of the device flags (above) could be invalid,
691 * and it would be possible to take an incorrect action - we do
692 * not want to hang because of a short INQUIRY. On the flip side,
693 * if the device is spun down or becoming ready (and so it gives a
694 * short INQUIRY), an abort here prevents any further use of the
695 * device, including spin up.
696 *
Alan Sterne423ee32007-02-16 01:46:38 -0800697 * On the whole, the best approach seems to be to assume the first
698 * 36 bytes are valid no matter what the device says. That's
699 * better than copying < 36 bytes to the inquiry-result buffer
700 * and displaying garbage for the Vendor, Product, or Revision
701 * strings.
702 */
703 if (sdev->inquiry_len < 36) {
Hannes Reinecke91921e02014-06-25 16:39:59 +0200704 sdev_printk(KERN_INFO, sdev,
705 "scsi scan: INQUIRY result too short (%d),"
706 " using 36\n", sdev->inquiry_len);
Alan Sterne423ee32007-02-16 01:46:38 -0800707 sdev->inquiry_len = 36;
708 }
709
710 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 * Related to the above issue:
712 *
713 * XXX Devices (disk or all?) should be sent a TEST UNIT READY,
714 * and if not ready, sent a START_STOP to start (maybe spin up) and
715 * then send the INQUIRY again, since the INQUIRY can change after
716 * a device is initialized.
717 *
718 * Ideally, start a device if explicitly asked to do so. This
719 * assumes that a device is spun up on power on, spun down on
720 * request, and then spun up on request.
721 */
722
723 /*
724 * The scanning code needs to know the scsi_level, even if no
725 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so
726 * non-zero LUNs can be scanned.
727 */
728 sdev->scsi_level = inq_result[2] & 0x07;
729 if (sdev->scsi_level >= 2 ||
730 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1))
731 sdev->scsi_level++;
James Bottomley6f3a2022005-09-22 20:33:28 -0500732 sdev->sdev_target->scsi_level = sdev->scsi_level;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Alan Stern50c4e962014-09-02 11:35:50 -0400734 /*
735 * If SCSI-2 or lower, and if the transport requires it,
736 * store the LUN value in CDB[1].
737 */
738 sdev->lun_in_cdb = 0;
739 if (sdev->scsi_level <= SCSI_2 &&
740 sdev->scsi_level != SCSI_UNKNOWN &&
741 !sdev->host->no_scsi2_lun_in_cdb)
742 sdev->lun_in_cdb = 1;
743
James Bottomley39216032005-06-15 18:48:29 -0500744 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745}
746
747/**
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100748 * scsi_add_lun - allocate and fully initialze a scsi_device
Matthew Wilcox6d877682007-07-11 12:54:55 -0600749 * @sdev: holds information to be stored in the new scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 * @inq_result: holds the result of a previous INQUIRY to the LUN
751 * @bflags: black/white list flag
Matthew Wilcox6d877682007-07-11 12:54:55 -0600752 * @async: 1 if this device is being scanned asynchronously
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 *
754 * Description:
Matthew Wilcox6d877682007-07-11 12:54:55 -0600755 * Initialize the scsi_device @sdev. Optionally set fields based
756 * on values in *@bflags.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 *
758 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100759 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
760 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 **/
Alan Sterne5b3cd42006-08-21 15:53:25 -0400762static int scsi_add_lun(struct scsi_device *sdev, unsigned char *inq_result,
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600763 int *bflags, int async)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764{
James Bottomley6f4267e2008-08-22 16:53:31 -0500765 int ret;
766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 /*
768 * XXX do not save the inquiry, since it can change underneath us,
769 * save just vendor/model/rev.
770 *
771 * Rather than save it and have an ioctl that retrieves the saved
772 * value, have an ioctl that executes the same INQUIRY code used
773 * in scsi_probe_lun, let user level programs doing INQUIRY
774 * scanning run at their own risk, or supply a user level program
775 * that can correctly scan.
776 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Alan Stern09123d22006-11-10 12:27:57 -0800778 /*
779 * Copy at least 36 bytes of INQUIRY data, so that we don't
780 * dereference unallocated memory when accessing the Vendor,
781 * Product, and Revision strings. Badly behaved devices may set
782 * the INQUIRY Additional Length byte to a small value, indicating
783 * these strings are invalid, but often they contain plausible data
784 * nonetheless. It doesn't matter if the device sent < 36 bytes
785 * total, since scsi_probe_lun() initializes inq_result with 0s.
786 */
787 sdev->inquiry = kmemdup(inq_result,
788 max_t(size_t, sdev->inquiry_len, 36),
789 GFP_ATOMIC);
790 if (sdev->inquiry == NULL)
791 return SCSI_SCAN_NO_RESPONSE;
792
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 sdev->vendor = (char *) (sdev->inquiry + 8);
794 sdev->model = (char *) (sdev->inquiry + 16);
795 sdev->rev = (char *) (sdev->inquiry + 32);
796
James Bottomley14216562012-07-25 23:55:55 +0400797 if (strncmp(sdev->vendor, "ATA ", 8) == 0) {
798 /*
799 * sata emulation layer device. This is a hack to work around
800 * the SATL power management specifications which state that
801 * when the SATL detects the device has gone into standby
802 * mode, it shall respond with NOT READY.
803 */
804 sdev->allow_restart = 1;
805 }
806
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 if (*bflags & BLIST_ISROM) {
Matthew Wilcox6d877682007-07-11 12:54:55 -0600808 sdev->type = TYPE_ROM;
809 sdev->removable = 1;
810 } else {
811 sdev->type = (inq_result[0] & 0x1f);
812 sdev->removable = (inq_result[1] & 0x80) >> 7;
Subhash Jadavani45341ca2014-09-25 15:32:19 +0300813
814 /*
815 * some devices may respond with wrong type for
816 * well-known logical units. Force well-known type
817 * to enumerate them correctly.
818 */
819 if (scsi_is_wlun(sdev->lun) && sdev->type != TYPE_WLUN) {
820 sdev_printk(KERN_WARNING, sdev,
821 "%s: correcting incorrect peripheral device type 0x%x for W-LUN 0x%16xhN\n",
822 __func__, sdev->type, (unsigned int)sdev->lun);
823 sdev->type = TYPE_WLUN;
824 }
825
Matthew Wilcox6d877682007-07-11 12:54:55 -0600826 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
Matthew Wilcox6d877682007-07-11 12:54:55 -0600828 if (sdev->type == TYPE_RBC || sdev->type == TYPE_ROM) {
829 /* RBC and MMC devices can return SCSI-3 compliance and yet
830 * still not support REPORT LUNS, so make them act as
831 * BLIST_NOREPORTLUN unless BLIST_REPORTLUN2 is
832 * specifically set */
833 if ((*bflags & BLIST_REPORTLUN2) == 0)
834 *bflags |= BLIST_NOREPORTLUN;
835 }
836
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 /*
838 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI
839 * spec says: The device server is capable of supporting the
840 * specified peripheral device type on this logical unit. However,
841 * the physical device is not currently connected to this logical
842 * unit.
843 *
844 * The above is vague, as it implies that we could treat 001 and
845 * 011 the same. Stay compatible with previous code, and create a
Christoph Hellwigf64a1812005-10-31 18:32:08 +0100846 * scsi_device for a PQ of 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 *
848 * Don't set the device offline here; rather let the upper
849 * level drivers eval the PQ to decide whether they should
850 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check.
851 */
852
853 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 sdev->lockable = sdev->removable;
855 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2);
856
Matthew Wilcox6d877682007-07-11 12:54:55 -0600857 if (sdev->scsi_level >= SCSI_3 ||
858 (sdev->inquiry_len > 56 && inq_result[56] & 0x04))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 sdev->ppr = 1;
860 if (inq_result[7] & 0x60)
861 sdev->wdtr = 1;
862 if (inq_result[7] & 0x10)
863 sdev->sdtr = 1;
864
James Bottomley19ac0db2006-08-06 18:15:22 -0500865 sdev_printk(KERN_NOTICE, sdev, "%s %.8s %.16s %.4s PQ: %d "
Matthew Wilcox4ff36712006-07-04 12:15:20 -0600866 "ANSI: %d%s\n", scsi_device_type(sdev->type),
867 sdev->vendor, sdev->model, sdev->rev,
868 sdev->inq_periph_qual, inq_result[2] & 0x07,
869 (inq_result[3] & 0x0f) == 1 ? " CCS" : "");
870
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) &&
Christoph Hellwigc8b09f62014-11-03 20:15:14 +0100872 !(*bflags & BLIST_NOTQ)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 sdev->tagged_supported = 1;
Christoph Hellwigc8b09f62014-11-03 20:15:14 +0100874 sdev->simple_tags = 1;
875 }
Matthew Wilcox6d877682007-07-11 12:54:55 -0600876
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 /*
878 * Some devices (Texel CD ROM drives) have handshaking problems
879 * when used with the Seagate controllers. borken is initialized
880 * to 1, and then set it to 0 here.
881 */
882 if ((*bflags & BLIST_BORKEN) == 0)
883 sdev->borken = 0;
884
Matthew Wilcox6d877682007-07-11 12:54:55 -0600885 if (*bflags & BLIST_NO_ULD_ATTACH)
886 sdev->no_uld_attach = 1;
887
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 /*
889 * Apparently some really broken devices (contrary to the SCSI
890 * standards) need to be selected without asserting ATN
891 */
892 if (*bflags & BLIST_SELECT_NO_ATN)
893 sdev->select_no_atn = 1;
894
895 /*
James Bottomley4d7db042006-03-31 20:07:45 -0600896 * Maximum 512 sector transfer length
897 * broken RA4x00 Compaq Disk Array
898 */
899 if (*bflags & BLIST_MAX_512)
Martin K. Petersen086fa5f2010-02-26 00:20:38 -0500900 blk_queue_max_hw_sectors(sdev->request_queue, 512);
Mike Christie35e9a9f2015-04-20 22:42:24 -0500901 /*
902 * Max 1024 sector transfer length for targets that report incorrect
903 * max/optimal lengths and relied on the old block layer safe default
904 */
905 else if (*bflags & BLIST_MAX_1024)
906 blk_queue_max_hw_sectors(sdev->request_queue, 1024);
James Bottomley4d7db042006-03-31 20:07:45 -0600907
908 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 * Some devices may not want to have a start command automatically
910 * issued when a device is added.
911 */
912 if (*bflags & BLIST_NOSTARTONADD)
913 sdev->no_start_on_add = 1;
914
915 if (*bflags & BLIST_SINGLELUN)
Tony Battersby25d7c362007-11-12 10:00:44 -0500916 scsi_target(sdev)->single_lun = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 sdev->use_10_for_rw = 1;
919
920 if (*bflags & BLIST_MS_SKIP_PAGE_08)
921 sdev->skip_ms_page_8 = 1;
922
923 if (*bflags & BLIST_MS_SKIP_PAGE_3F)
924 sdev->skip_ms_page_3f = 1;
925
926 if (*bflags & BLIST_USE_10_BYTE_MS)
927 sdev->use_10_for_ms = 1;
928
Janusz Dziemidowicz02134362014-07-24 15:48:46 +0200929 /* some devices don't like REPORT SUPPORTED OPERATION CODES
930 * and will simply timeout causing sd_mod init to take a very
931 * very long time */
932 if (*bflags & BLIST_NO_RSOC)
933 sdev->no_report_opcodes = 1;
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 /* set the device running here so that slave configure
936 * may do I/O */
James Bottomley6f4267e2008-08-22 16:53:31 -0500937 ret = scsi_device_set_state(sdev, SDEV_RUNNING);
938 if (ret) {
939 ret = scsi_device_set_state(sdev, SDEV_BLOCK);
940
941 if (ret) {
942 sdev_printk(KERN_ERR, sdev,
943 "in wrong state %s to complete scan\n",
944 scsi_device_state_name(sdev->sdev_state));
945 return SCSI_SCAN_NO_RESPONSE;
946 }
947 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
949 if (*bflags & BLIST_MS_192_BYTES_FOR_3F)
950 sdev->use_192_bytes_for_3f = 1;
951
952 if (*bflags & BLIST_NOT_LOCKABLE)
953 sdev->lockable = 0;
954
955 if (*bflags & BLIST_RETRY_HWERROR)
956 sdev->retry_hwerror = 1;
957
Martin K. Petersend974e422012-08-28 14:29:35 -0400958 if (*bflags & BLIST_NO_DIF)
959 sdev->no_dif = 1;
960
Martin K. Petersen0816c922013-05-10 10:36:04 -0400961 sdev->eh_timeout = SCSI_DEFAULT_EH_TIMEOUT;
962
Martin K. Petersenc1d40a52014-07-15 12:49:17 -0400963 if (*bflags & BLIST_TRY_VPD_PAGES)
964 sdev->try_vpd_pages = 1;
965 else if (*bflags & BLIST_SKIP_VPD_PAGES)
Martin K. Petersen56f2a802013-04-24 21:19:47 -0400966 sdev->skip_vpd_pages = 1;
967
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 transport_configure_device(&sdev->sdev_gendev);
969
Christoph Hellwig93805092006-02-17 12:11:29 +0100970 if (sdev->host->hostt->slave_configure) {
James Bottomley6f4267e2008-08-22 16:53:31 -0500971 ret = sdev->host->hostt->slave_configure(sdev);
Christoph Hellwig93805092006-02-17 12:11:29 +0100972 if (ret) {
973 /*
974 * if LLDD reports slave not present, don't clutter
975 * console with alloc failure messages
976 */
977 if (ret != -ENXIO) {
978 sdev_printk(KERN_ERR, sdev,
979 "failed to configure device\n");
980 }
981 return SCSI_SCAN_NO_RESPONSE;
982 }
983 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
Hannes Reineckeb3ae8782014-03-15 09:51:49 +0100985 if (sdev->scsi_level >= SCSI_3)
986 scsi_attach_vpd(sdev);
987
Vasu Dev4a840672009-10-22 15:46:33 -0700988 sdev->max_queue_depth = sdev->queue_depth;
989
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 /*
991 * Ok, the device is now all set up, we can
992 * register it and tell the rest of the kernel
993 * about it.
994 */
Matthew Wilcox3e082a92006-09-28 15:19:20 -0600995 if (!async && scsi_sysfs_add_sdev(sdev) != 0)
Alan Sternb24b1032005-07-27 11:43:46 -0700996 return SCSI_SCAN_NO_RESPONSE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997
998 return SCSI_SCAN_LUN_PRESENT;
999}
1000
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001001#ifdef CONFIG_SCSI_LOGGING
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001002/**
Rob Landleyeb448202007-11-03 13:30:39 -05001003 * scsi_inq_str - print INQUIRY data from min to max index, strip trailing whitespace
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001004 * @buf: Output buffer with at least end-first+1 bytes of space
1005 * @inq: Inquiry buffer (input)
1006 * @first: Offset of string into inq
1007 * @end: Index after last character in inq
1008 */
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001009static unsigned char *scsi_inq_str(unsigned char *buf, unsigned char *inq,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001010 unsigned first, unsigned end)
1011{
1012 unsigned term = 0, idx;
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001013
1014 for (idx = 0; idx + first < end && idx + first < inq[4] + 5; idx++) {
1015 if (inq[idx+first] > ' ') {
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001016 buf[idx] = inq[idx+first];
1017 term = idx+1;
1018 } else {
1019 buf[idx] = ' ';
1020 }
1021 }
1022 buf[term] = 0;
1023 return buf;
1024}
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001025#endif
James Bottomley6f3a2022005-09-22 20:33:28 -05001026
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027/**
1028 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it
1029 * @starget: pointer to target device structure
1030 * @lun: LUN of target device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 * @bflagsp: store bflags here if not NULL
Rob Landleyeb448202007-11-03 13:30:39 -05001032 * @sdevp: probe the LUN corresponding to this scsi_device
1033 * @rescan: if nonzero skip some code only needed on first scan
1034 * @hostdata: passed to scsi_alloc_sdev()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 *
1036 * Description:
1037 * Call scsi_probe_lun, if a LUN with an attached device is found,
1038 * allocate and set it up by calling scsi_add_lun.
1039 *
1040 * Return:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001041 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is
1043 * attached at the LUN
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001044 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 **/
1046static int scsi_probe_and_add_lun(struct scsi_target *starget,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001047 u64 lun, int *bflagsp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 struct scsi_device **sdevp, int rescan,
1049 void *hostdata)
1050{
1051 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 unsigned char *result;
James Bottomley39216032005-06-15 18:48:29 -05001053 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1055
1056 /*
1057 * The rescan flag is used as an optimization, the first scan of a
1058 * host adapter calls into here with rescan == 0.
1059 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001060 sdev = scsi_device_lookup_by_target(starget, lun);
1061 if (sdev) {
James Bottomley0f1d87a2008-08-22 16:43:59 -05001062 if (rescan || !scsi_device_created(sdev)) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001063 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 "scsi scan: device exists on %s\n",
Kay Sievers71610f52008-12-03 22:41:36 +01001065 dev_name(&sdev->sdev_gendev)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 if (sdevp)
1067 *sdevp = sdev;
1068 else
1069 scsi_device_put(sdev);
1070
1071 if (bflagsp)
1072 *bflagsp = scsi_get_device_flags(sdev,
1073 sdev->vendor,
1074 sdev->model);
1075 return SCSI_SCAN_LUN_PRESENT;
1076 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001077 scsi_device_put(sdev);
1078 } else
1079 sdev = scsi_alloc_sdev(starget, lun, hostdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 if (!sdev)
1081 goto out;
James Bottomley39216032005-06-15 18:48:29 -05001082
1083 result = kmalloc(result_len, GFP_ATOMIC |
Al Virobc861202005-04-24 12:28:34 -07001084 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 if (!result)
James Bottomley39216032005-06-15 18:48:29 -05001086 goto out_free_sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087
James Bottomley39216032005-06-15 18:48:29 -05001088 if (scsi_probe_lun(sdev, result, result_len, &bflags))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 goto out_free_result;
1090
Kurt Garloff4186ab12006-04-03 15:16:48 +02001091 if (bflagsp)
1092 *bflagsp = bflags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 /*
1094 * result contains valid SCSI INQUIRY data.
1095 */
Kurt Garloff13f7e5a2006-04-03 15:20:08 +02001096 if (((result[0] >> 5) == 3) && !(bflags & BLIST_ATTACH_PQ3)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 /*
1098 * For a Peripheral qualifier 3 (011b), the SCSI
1099 * spec says: The device server is not capable of
1100 * supporting a physical device on this logical
1101 * unit.
1102 *
1103 * For disks, this implies that there is no
1104 * logical disk configured at sdev->lun, but there
1105 * is a target id responding.
1106 */
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001107 SCSI_LOG_SCAN_BUS(2, sdev_printk(KERN_INFO, sdev, "scsi scan:"
1108 " peripheral qualifier of 3, device not"
1109 " added\n"))
1110 if (lun == 0) {
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001111 SCSI_LOG_SCAN_BUS(1, {
1112 unsigned char vend[9];
1113 unsigned char mod[17];
1114
1115 sdev_printk(KERN_INFO, sdev,
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001116 "scsi scan: consider passing scsi_mod."
Kurt Garloff3424a652007-01-09 02:28:54 +01001117 "dev_flags=%s:%s:0x240 or 0x1000240\n",
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001118 scsi_inq_str(vend, result, 8, 16),
akpm@osdl.orgc5f2e642006-04-15 00:30:24 -07001119 scsi_inq_str(mod, result, 16, 32));
1120 });
James Bottomley643eb2d2008-03-22 22:42:27 -05001121
Kurt Garloff6c7154c2006-04-03 15:18:35 +02001122 }
James Bottomley643eb2d2008-03-22 22:42:27 -05001123
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 res = SCSI_SCAN_TARGET_PRESENT;
1125 goto out_free_result;
1126 }
1127
Alan Stern1bfc5d92006-02-09 15:26:18 -05001128 /*
dave wysochanski84961f22006-08-09 14:56:32 -04001129 * Some targets may set slight variations of PQ and PDT to signal
1130 * that no LUN is present, so don't add sdev in these cases.
1131 * Two specific examples are:
1132 * 1) NetApp targets: return PQ=1, PDT=0x1f
1133 * 2) USB UFI: returns PDT=0x1f, with the PQ bits being "reserved"
1134 * in the UFI 1.0 spec (we cannot rely on reserved bits).
1135 *
1136 * References:
1137 * 1) SCSI SPC-3, pp. 145-146
1138 * PQ=1: "A peripheral device having the specified peripheral
1139 * device type is not connected to this logical unit. However, the
1140 * device server is capable of supporting the specified peripheral
1141 * device type on this logical unit."
1142 * PDT=0x1f: "Unknown or no device type"
1143 * 2) USB UFI 1.0, p. 20
1144 * PDT=00h Direct-access device (floppy)
1145 * PDT=1Fh none (no FDD connected to the requested logical unit)
Alan Stern1bfc5d92006-02-09 15:26:18 -05001146 */
dave wysochanski84961f22006-08-09 14:56:32 -04001147 if (((result[0] >> 5) == 1 || starget->pdt_1f_for_no_lun) &&
James Bottomley01b291b2008-08-21 15:14:14 -05001148 (result[0] & 0x1f) == 0x1f &&
1149 !scsi_is_wlun(lun)) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001150 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev,
Alan Stern1bfc5d92006-02-09 15:26:18 -05001151 "scsi scan: peripheral device type"
1152 " of 31, no device added\n"));
1153 res = SCSI_SCAN_TARGET_PRESENT;
1154 goto out_free_result;
1155 }
1156
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001157 res = scsi_add_lun(sdev, result, &bflags, shost->async_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 if (res == SCSI_SCAN_LUN_PRESENT) {
1159 if (bflags & BLIST_KEY) {
1160 sdev->lockable = 0;
James Bottomley39216032005-06-15 18:48:29 -05001161 scsi_unlock_floptical(sdev, result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 }
1164
1165 out_free_result:
1166 kfree(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 out_free_sdev:
1168 if (res == SCSI_SCAN_LUN_PRESENT) {
1169 if (sdevp) {
Alan Sternb70d37b2005-07-26 10:30:40 -04001170 if (scsi_device_get(sdev) == 0) {
1171 *sdevp = sdev;
1172 } else {
1173 __scsi_remove_device(sdev);
1174 res = SCSI_SCAN_NO_RESPONSE;
1175 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001177 } else
James Bottomley860dc732009-11-19 17:48:29 -05001178 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 out:
1180 return res;
1181}
1182
1183/**
1184 * scsi_sequential_lun_scan - sequentially scan a SCSI target
1185 * @starget: pointer to target structure to scan
1186 * @bflags: black/white list flag for LUN 0
Rob Landleyeb448202007-11-03 13:30:39 -05001187 * @scsi_level: Which version of the standard does this device adhere to
1188 * @rescan: passed to scsi_probe_add_lun()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 *
1190 * Description:
1191 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been
1192 * scanned) to some maximum lun until a LUN is found with no device
1193 * attached. Use the bflags to figure out any oddities.
1194 *
1195 * Modifies sdevscan->lun.
1196 **/
1197static void scsi_sequential_lun_scan(struct scsi_target *starget,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001198 int bflags, int scsi_level, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199{
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001200 uint max_dev_lun;
1201 u64 sparse_lun, lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1203
Hannes Reinecke91921e02014-06-25 16:39:59 +02001204 SCSI_LOG_SCAN_BUS(3, starget_printk(KERN_INFO, starget,
1205 "scsi scan: Sequential scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206
1207 max_dev_lun = min(max_scsi_luns, shost->max_lun);
1208 /*
1209 * If this device is known to support sparse multiple units,
1210 * override the other settings, and scan all of them. Normally,
1211 * SCSI-3 devices should be scanned via the REPORT LUNS.
1212 */
1213 if (bflags & BLIST_SPARSELUN) {
1214 max_dev_lun = shost->max_lun;
1215 sparse_lun = 1;
1216 } else
1217 sparse_lun = 0;
1218
1219 /*
Mark Knibbsfb0d82f2014-10-09 12:39:40 +01001220 * If less than SCSI_1_CCS, and no special lun scanning, stop
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 * scanning; this matches 2.4 behaviour, but could just be a bug
Mark Knibbsfb0d82f2014-10-09 12:39:40 +01001222 * (to continue scanning a SCSI_1_CCS device).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 *
1224 * This test is broken. We might not have any device on lun0 for
1225 * a sparselun device, and if that's the case then how would we
1226 * know the real scsi_level, eh? It might make sense to just not
1227 * scan any SCSI_1 device for non-0 luns, but that check would best
1228 * go into scsi_alloc_sdev() and just have it return null when asked
1229 * to alloc an sdev for lun > 0 on an already found SCSI_1 device.
1230 *
1231 if ((sdevscan->scsi_level < SCSI_1_CCS) &&
1232 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN))
1233 == 0))
1234 return;
1235 */
1236 /*
1237 * If this device is known to support multiple units, override
1238 * the other settings, and scan all of them.
1239 */
1240 if (bflags & BLIST_FORCELUN)
1241 max_dev_lun = shost->max_lun;
1242 /*
1243 * REGAL CDC-4X: avoid hang after LUN 4
1244 */
1245 if (bflags & BLIST_MAX5LUN)
1246 max_dev_lun = min(5U, max_dev_lun);
1247 /*
1248 * Do not scan SCSI-2 or lower device past LUN 7, unless
1249 * BLIST_LARGELUN.
1250 */
1251 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN))
1252 max_dev_lun = min(8U, max_dev_lun);
1253
1254 /*
Hannes Reinecke22ffeb42014-06-03 10:58:53 +02001255 * Stop scanning at 255 unless BLIST_SCSI3LUN
1256 */
1257 if (!(bflags & BLIST_SCSI3LUN))
1258 max_dev_lun = min(256U, max_dev_lun);
1259
1260 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 * We have already scanned LUN 0, so start at LUN 1. Keep scanning
1262 * until we reach the max, or no LUN is found and we are not
1263 * sparse_lun.
1264 */
1265 for (lun = 1; lun < max_dev_lun; ++lun)
1266 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan,
1267 NULL) != SCSI_SCAN_LUN_PRESENT) &&
1268 !sparse_lun)
1269 return;
1270}
1271
1272/**
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results
Rob Landleyeb448202007-11-03 13:30:39 -05001274 * @starget: which target
1275 * @bflags: Zero or a mix of BLIST_NOLUN, BLIST_REPORTLUN2, or BLIST_NOREPORTLUN
1276 * @rescan: nonzero if we can skip code only needed on first scan
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 *
1278 * Description:
Rob Landleyeb448202007-11-03 13:30:39 -05001279 * Fast scanning for modern (SCSI-3) devices by sending a REPORT LUN command.
1280 * Scan the resulting list of LUNs by calling scsi_probe_and_add_lun.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 *
Rob Landleyeb448202007-11-03 13:30:39 -05001282 * If BLINK_REPORTLUN2 is set, scan a target that supports more than 8
1283 * LUNs even if it's older than SCSI-3.
1284 * If BLIST_NOREPORTLUN is set, return 1 always.
1285 * If BLIST_NOLUN is set, return 0 always.
Alan Stern09b6b512012-01-10 13:43:30 -05001286 * If starget->no_report_luns is set, return 1 always.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 *
1288 * Return:
1289 * 0: scan completed (or no memory, so further scanning is futile)
Rob Landleyeb448202007-11-03 13:30:39 -05001290 * 1: could not scan with REPORT LUN
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291 **/
James Bottomley6f3a2022005-09-22 20:33:28 -05001292static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293 int rescan)
1294{
1295 char devname[64];
1296 unsigned char scsi_cmd[MAX_COMMAND_SIZE];
1297 unsigned int length;
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001298 u64 lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299 unsigned int num_luns;
1300 unsigned int retries;
James Bottomley39216032005-06-15 18:48:29 -05001301 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 struct scsi_lun *lunp, *lun_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 struct scsi_sense_hdr sshdr;
James Bottomley6f3a2022005-09-22 20:33:28 -05001304 struct scsi_device *sdev;
1305 struct Scsi_Host *shost = dev_to_shost(&starget->dev);
Alan Stern2ef89192005-11-08 15:51:55 -05001306 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
1308 /*
1309 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set.
1310 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
1311 * support more than 8 LUNs.
Alan Stern09b6b512012-01-10 13:43:30 -05001312 * Don't attempt if the target doesn't support REPORT LUNS.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 */
James Bottomley4d7db042006-03-31 20:07:45 -06001314 if (bflags & BLIST_NOREPORTLUN)
1315 return 1;
1316 if (starget->scsi_level < SCSI_2 &&
1317 starget->scsi_level != SCSI_UNKNOWN)
1318 return 1;
1319 if (starget->scsi_level < SCSI_3 &&
1320 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 return 1;
1322 if (bflags & BLIST_NOLUN)
1323 return 0;
Alan Stern09b6b512012-01-10 13:43:30 -05001324 if (starget->no_report_luns)
1325 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326
James Bottomley6f3a2022005-09-22 20:33:28 -05001327 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) {
1328 sdev = scsi_alloc_sdev(starget, 0, NULL);
1329 if (!sdev)
1330 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001331 if (scsi_device_get(sdev)) {
1332 __scsi_remove_device(sdev);
James Bottomley6f3a2022005-09-22 20:33:28 -05001333 return 0;
Alan Stern75f8ee82010-02-12 12:13:31 -05001334 }
James Bottomley6f3a2022005-09-22 20:33:28 -05001335 }
1336
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 sprintf(devname, "host %d channel %d id %d",
James Bottomley6f3a2022005-09-22 20:33:28 -05001338 shost->host_no, sdev->channel, sdev->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
1340 /*
1341 * Allocate enough to hold the header (the same size as one scsi_lun)
Rob Eversacd6d732014-12-16 11:01:20 -05001342 * plus the number of luns we are requesting. 511 was the default
1343 * value of the now removed max_report_luns parameter.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 */
Rob Eversacd6d732014-12-16 11:01:20 -05001345 length = (511 + 1) * sizeof(struct scsi_lun);
1346retry:
Rob Everseb9eea02014-12-16 11:01:18 -05001347 lun_data = kmalloc(length, GFP_KERNEL |
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0));
James Bottomley6f3a2022005-09-22 20:33:28 -05001349 if (!lun_data) {
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001350 printk(ALLOC_FAILURE_MSG, __func__);
James Bottomley39216032005-06-15 18:48:29 -05001351 goto out;
James Bottomley6f3a2022005-09-22 20:33:28 -05001352 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
1354 scsi_cmd[0] = REPORT_LUNS;
1355
1356 /*
1357 * bytes 1 - 5: reserved, set to zero.
1358 */
1359 memset(&scsi_cmd[1], 0, 5);
1360
1361 /*
1362 * bytes 6 - 9: length of the command.
1363 */
Rob Evers2a904e52014-12-16 11:01:19 -05001364 put_unaligned_be32(length, &scsi_cmd[6]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365
1366 scsi_cmd[10] = 0; /* reserved */
1367 scsi_cmd[11] = 0; /* control */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368
1369 /*
1370 * We can get a UNIT ATTENTION, for example a power on/reset, so
1371 * retry a few times (like sd.c does for TEST UNIT READY).
1372 * Experience shows some combinations of adapter/devices get at
1373 * least two power on/resets.
1374 *
1375 * Illegal requests (for devices that do not support REPORT LUNS)
1376 * should come through as a check condition, and will not generate
1377 * a retry.
1378 */
1379 for (retries = 0; retries < 3; retries++) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001380 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1381 "scsi scan: Sending REPORT LUNS to (try %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 retries));
James Bottomley39216032005-06-15 18:48:29 -05001383
James Bottomley39216032005-06-15 18:48:29 -05001384 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
James Bottomleyea73a9f2005-08-28 11:33:52 -05001385 lun_data, length, &sshdr,
FUJITA Tomonorif4f4e472008-12-04 14:24:39 +09001386 SCSI_TIMEOUT + 4 * HZ, 3, NULL);
James Bottomley39216032005-06-15 18:48:29 -05001387
Hannes Reinecke91921e02014-06-25 16:39:59 +02001388 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1389 "scsi scan: REPORT LUNS"
1390 " %s (try %d) result 0x%x\n",
1391 result ? "failed" : "successful",
1392 retries, result));
James Bottomley39216032005-06-15 18:48:29 -05001393 if (result == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 break;
James Bottomleyea73a9f2005-08-28 11:33:52 -05001395 else if (scsi_sense_valid(&sshdr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 if (sshdr.sense_key != UNIT_ATTENTION)
1397 break;
1398 }
1399 }
1400
James Bottomley39216032005-06-15 18:48:29 -05001401 if (result) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 /*
1403 * The device probably does not support a REPORT LUN command
1404 */
Alan Stern2ef89192005-11-08 15:51:55 -05001405 ret = 1;
1406 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408
1409 /*
1410 * Get the length from the first four bytes of lun_data.
1411 */
Rob Eversacd6d732014-12-16 11:01:20 -05001412 if (get_unaligned_be32(lun_data->scsi_lun) +
1413 sizeof(struct scsi_lun) > length) {
1414 length = get_unaligned_be32(lun_data->scsi_lun) +
1415 sizeof(struct scsi_lun);
1416 kfree(lun_data);
1417 goto retry;
1418 }
Rob Evers2a904e52014-12-16 11:01:19 -05001419 length = get_unaligned_be32(lun_data->scsi_lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420
1421 num_luns = (length / sizeof(struct scsi_lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001423 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev,
1424 "scsi scan: REPORT LUN scan\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425
1426 /*
1427 * Scan the luns in lun_data. The entry at offset 0 is really
1428 * the header, so start at 1 and go up to and including num_luns.
1429 */
1430 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) {
1431 lun = scsilun_to_int(lunp);
1432
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001433 if (lun > sdev->host->max_lun) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001434 sdev_printk(KERN_WARNING, sdev,
1435 "lun%llu has a LUN larger than"
1436 " allowed by the host adapter\n", lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 } else {
1438 int res;
1439
1440 res = scsi_probe_and_add_lun(starget,
1441 lun, NULL, NULL, rescan, NULL);
1442 if (res == SCSI_SCAN_NO_RESPONSE) {
1443 /*
1444 * Got some results, but now none, abort.
1445 */
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001446 sdev_printk(KERN_ERR, sdev,
1447 "Unexpected response"
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001448 " from lun %llu while scanning, scan"
1449 " aborted\n", (unsigned long long)lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 break;
1451 }
1452 }
1453 }
1454
Alan Stern2ef89192005-11-08 15:51:55 -05001455 out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456 kfree(lun_data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 out:
James Bottomley6f3a2022005-09-22 20:33:28 -05001458 scsi_device_put(sdev);
James Bottomley0f1d87a2008-08-22 16:43:59 -05001459 if (scsi_device_created(sdev))
James Bottomley6f3a2022005-09-22 20:33:28 -05001460 /*
1461 * the sdev we used didn't appear in the report luns scan
1462 */
James Bottomley860dc732009-11-19 17:48:29 -05001463 __scsi_remove_device(sdev);
Alan Stern2ef89192005-11-08 15:51:55 -05001464 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465}
1466
1467struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001468 uint id, u64 lun, void *hostdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469{
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001470 struct scsi_device *sdev = ERR_PTR(-ENODEV);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 struct device *parent = &shost->shost_gendev;
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001472 struct scsi_target *starget;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473
Matthew Wilcox938e2ac2007-01-15 18:07:09 -07001474 if (strncmp(scsi_scan_type, "none", 4) == 0)
1475 return ERR_PTR(-ENODEV);
1476
Christoph Hellwige02f3f52006-01-13 19:04:00 +01001477 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478 if (!starget)
1479 return ERR_PTR(-ENOMEM);
Alan Sternbc4f2402010-06-17 10:41:42 -04001480 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481
Arjan van de Ven0b950672006-01-11 13:16:10 +01001482 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001483 if (!shost->async_scan)
1484 scsi_complete_async_scans();
1485
Alan Sternbc4f2402010-06-17 10:41:42 -04001486 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Matthew Wilcoxa97a83a2006-02-05 08:01:33 -07001487 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
Alan Sternbc4f2402010-06-17 10:41:42 -04001488 scsi_autopm_put_host(shost);
1489 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001490 mutex_unlock(&shost->scan_mutex);
Alan Sternbc4f2402010-06-17 10:41:42 -04001491 scsi_autopm_put_target(starget);
James Bottomleye63ed0d2014-01-21 07:00:50 -08001492 /*
1493 * paired with scsi_alloc_target(). Target will be destroyed unless
1494 * scsi_probe_and_add_lun made an underlying device visible
1495 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 scsi_target_reap(starget);
1497 put_device(&starget->dev);
1498
1499 return sdev;
1500}
1501EXPORT_SYMBOL(__scsi_add_device);
1502
James Bottomley146f7262005-09-10 12:44:09 -05001503int scsi_add_device(struct Scsi_Host *host, uint channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001504 uint target, u64 lun)
James Bottomley146f7262005-09-10 12:44:09 -05001505{
1506 struct scsi_device *sdev =
1507 __scsi_add_device(host, channel, target, lun, NULL);
1508 if (IS_ERR(sdev))
1509 return PTR_ERR(sdev);
1510
1511 scsi_device_put(sdev);
1512 return 0;
1513}
1514EXPORT_SYMBOL(scsi_add_device);
1515
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516void scsi_rescan_device(struct device *dev)
1517{
Christoph Hellwige27829d2015-02-02 14:01:24 +01001518 device_lock(dev);
1519 if (dev->driver && try_module_get(dev->driver->owner)) {
Christoph Hellwig3af6b352014-11-12 18:34:51 +01001520 struct scsi_driver *drv = to_scsi_driver(dev->driver);
1521
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522 if (drv->rescan)
1523 drv->rescan(dev);
Christoph Hellwig3af6b352014-11-12 18:34:51 +01001524 module_put(dev->driver->owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 }
Christoph Hellwige27829d2015-02-02 14:01:24 +01001526 device_unlock(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527}
1528EXPORT_SYMBOL(scsi_rescan_device);
1529
Alan Sterne517d312005-07-26 10:18:45 -04001530static void __scsi_scan_target(struct device *parent, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001531 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532{
1533 struct Scsi_Host *shost = dev_to_shost(parent);
1534 int bflags = 0;
1535 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 struct scsi_target *starget;
1537
1538 if (shost->this_id == id)
1539 /*
1540 * Don't scan the host adapter
1541 */
1542 return;
1543
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544 starget = scsi_alloc_target(parent, channel, id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 if (!starget)
1546 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001547 scsi_autopm_get_target(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 if (lun != SCAN_WILD_CARD) {
1550 /*
1551 * Scan for a specific host/chan/id/lun.
1552 */
1553 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL);
1554 goto out_reap;
1555 }
1556
1557 /*
1558 * Scan LUN 0, if there is some response, scan further. Ideally, we
1559 * would not configure LUN 0 until all LUNs are scanned.
1560 */
James Bottomley6f3a2022005-09-22 20:33:28 -05001561 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL);
1562 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) {
1563 if (scsi_report_lun_scan(starget, bflags, rescan) != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 /*
1565 * The REPORT LUN did not scan the target,
1566 * do a sequential scan.
1567 */
1568 scsi_sequential_lun_scan(starget, bflags,
Kurt Garloff4186ab12006-04-03 15:16:48 +02001569 starget->scsi_level, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571
1572 out_reap:
Alan Sternbc4f2402010-06-17 10:41:42 -04001573 scsi_autopm_put_target(starget);
James Bottomleye63ed0d2014-01-21 07:00:50 -08001574 /*
1575 * paired with scsi_alloc_target(): determine if the target has
1576 * any children at all and if not, nuke it
1577 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 scsi_target_reap(starget);
1579
1580 put_device(&starget->dev);
1581}
Alan Sterne517d312005-07-26 10:18:45 -04001582
1583/**
Randy Dunlape59e4a02008-02-29 22:02:50 -08001584 * scsi_scan_target - scan a target id, possibly including all LUNs on the target.
Alan Sterne517d312005-07-26 10:18:45 -04001585 * @parent: host to scan
1586 * @channel: channel to scan
1587 * @id: target id to scan
1588 * @lun: Specific LUN to scan or SCAN_WILD_CARD
1589 * @rescan: passed to LUN scanning routines
1590 *
1591 * Description:
1592 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0,
1593 * and possibly all LUNs on the target id.
1594 *
1595 * First try a REPORT LUN scan, if that does not scan the target, do a
1596 * sequential scan of LUNs on the target id.
1597 **/
1598void scsi_scan_target(struct device *parent, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001599 unsigned int id, u64 lun, int rescan)
Alan Sterne517d312005-07-26 10:18:45 -04001600{
1601 struct Scsi_Host *shost = dev_to_shost(parent);
1602
Matthew Wilcox93b45af2006-11-22 13:24:53 -07001603 if (strncmp(scsi_scan_type, "none", 4) == 0)
1604 return;
1605
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001606 mutex_lock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001607 if (!shost->async_scan)
1608 scsi_complete_async_scans();
1609
Alan Sternbc4f2402010-06-17 10:41:42 -04001610 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Alan Sterne517d312005-07-26 10:18:45 -04001611 __scsi_scan_target(parent, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001612 scsi_autopm_put_host(shost);
1613 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001614 mutex_unlock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001615}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616EXPORT_SYMBOL(scsi_scan_target);
1617
1618static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001619 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620{
1621 uint order_id;
1622
1623 if (id == SCAN_WILD_CARD)
1624 for (id = 0; id < shost->max_id; ++id) {
1625 /*
1626 * XXX adapter drivers when possible (FCP, iSCSI)
1627 * could modify max_id to match the current max,
1628 * not the absolute max.
1629 *
1630 * XXX add a shost id iterator, so for example,
1631 * the FC ID can be the same as a target id
1632 * without a huge overhead of sparse id's.
1633 */
1634 if (shost->reverse_ordering)
1635 /*
1636 * Scan from high to low id.
1637 */
1638 order_id = shost->max_id - id - 1;
1639 else
1640 order_id = id;
Alan Sterne517d312005-07-26 10:18:45 -04001641 __scsi_scan_target(&shost->shost_gendev, channel,
1642 order_id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643 }
1644 else
Alan Sterne517d312005-07-26 10:18:45 -04001645 __scsi_scan_target(&shost->shost_gendev, channel,
1646 id, lun, rescan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001647}
1648
1649int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001650 unsigned int id, u64 lun, int rescan)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651{
Jeff Garzik3bf743e2005-10-24 18:04:06 -04001652 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost,
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001653 "%s: <%u:%u:%llu>\n",
Harvey Harrisoncadbd4a2008-07-03 23:47:27 -07001654 __func__, channel, id, lun));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655
1656 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
Amit Arora091686d2006-05-19 16:14:50 -07001657 ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
Mark Knibbs605c6db2014-10-09 12:39:48 +01001658 ((lun != SCAN_WILD_CARD) && (lun >= shost->max_lun)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 return -EINVAL;
1660
Arjan van de Ven0b950672006-01-11 13:16:10 +01001661 mutex_lock(&shost->scan_mutex);
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001662 if (!shost->async_scan)
1663 scsi_complete_async_scans();
1664
Alan Sternbc4f2402010-06-17 10:41:42 -04001665 if (scsi_host_scan_allowed(shost) && scsi_autopm_get_host(shost) == 0) {
Mike Anderson82f29462005-06-16 11:14:33 -07001666 if (channel == SCAN_WILD_CARD)
1667 for (channel = 0; channel <= shost->max_channel;
1668 channel++)
1669 scsi_scan_channel(shost, channel, id, lun,
1670 rescan);
1671 else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 scsi_scan_channel(shost, channel, id, lun, rescan);
Alan Sternbc4f2402010-06-17 10:41:42 -04001673 scsi_autopm_put_host(shost);
Mike Anderson82f29462005-06-16 11:14:33 -07001674 }
Arjan van de Ven0b950672006-01-11 13:16:10 +01001675 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676
1677 return 0;
1678}
1679
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001680static void scsi_sysfs_add_devices(struct Scsi_Host *shost)
1681{
1682 struct scsi_device *sdev;
1683 shost_for_each_device(sdev, shost) {
Dan Williams3b661a92012-06-21 23:47:28 -07001684 /* target removed before the device could be added */
1685 if (sdev->sdev_state == SDEV_DEL)
1686 continue;
Subhash Jadavani693ad5b2014-09-25 15:32:20 +03001687 /* If device is already visible, skip adding it to sysfs */
1688 if (sdev->is_visible)
1689 continue;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001690 if (!scsi_host_scan_allowed(shost) ||
1691 scsi_sysfs_add_sdev(sdev) != 0)
James Bottomley860dc732009-11-19 17:48:29 -05001692 __scsi_remove_device(sdev);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001693 }
1694}
1695
1696/**
1697 * scsi_prep_async_scan - prepare for an async scan
1698 * @shost: the host which will be scanned
1699 * Returns: a cookie to be passed to scsi_finish_async_scan()
1700 *
1701 * Tells the midlayer this host is going to do an asynchronous scan.
1702 * It reserves the host's position in the scanning list and ensures
1703 * that other asynchronous scans started after this one won't affect the
1704 * ordering of the discovered devices.
1705 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001706static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001707{
1708 struct async_scan_data *data;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001709 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001710
1711 if (strncmp(scsi_scan_type, "sync", 4) == 0)
1712 return NULL;
1713
1714 if (shost->async_scan) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001715 shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001716 dump_stack();
1717 return NULL;
1718 }
1719
1720 data = kmalloc(sizeof(*data), GFP_KERNEL);
1721 if (!data)
1722 goto err;
1723 data->shost = scsi_host_get(shost);
1724 if (!data->shost)
1725 goto err;
1726 init_completion(&data->prev_finished);
1727
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001728 mutex_lock(&shost->scan_mutex);
1729 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001730 shost->async_scan = 1;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001731 spin_unlock_irqrestore(shost->host_lock, flags);
1732 mutex_unlock(&shost->scan_mutex);
1733
1734 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001735 if (list_empty(&scanning_hosts))
1736 complete(&data->prev_finished);
1737 list_add_tail(&data->list, &scanning_hosts);
1738 spin_unlock(&async_scan_lock);
1739
1740 return data;
1741
1742 err:
1743 kfree(data);
1744 return NULL;
1745}
1746
1747/**
1748 * scsi_finish_async_scan - asynchronous scan has finished
1749 * @data: cookie returned from earlier call to scsi_prep_async_scan()
1750 *
1751 * All the devices currently attached to this host have been found.
1752 * This function announces all the devices it has found to the rest
1753 * of the system.
1754 */
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001755static void scsi_finish_async_scan(struct async_scan_data *data)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001756{
1757 struct Scsi_Host *shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001758 unsigned long flags;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001759
1760 if (!data)
1761 return;
1762
1763 shost = data->shost;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001764
1765 mutex_lock(&shost->scan_mutex);
1766
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001767 if (!shost->async_scan) {
Hannes Reinecke91921e02014-06-25 16:39:59 +02001768 shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001769 dump_stack();
Julia Lawall773e82f2008-07-21 09:58:30 +02001770 mutex_unlock(&shost->scan_mutex);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001771 return;
1772 }
1773
1774 wait_for_completion(&data->prev_finished);
1775
1776 scsi_sysfs_add_devices(shost);
1777
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001778 spin_lock_irqsave(shost->host_lock, flags);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001779 shost->async_scan = 0;
Matthew Wilcox6b7f1232007-06-26 15:18:51 -06001780 spin_unlock_irqrestore(shost->host_lock, flags);
1781
1782 mutex_unlock(&shost->scan_mutex);
1783
1784 spin_lock(&async_scan_lock);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001785 list_del(&data->list);
1786 if (!list_empty(&scanning_hosts)) {
1787 struct async_scan_data *next = list_entry(scanning_hosts.next,
1788 struct async_scan_data, list);
1789 complete(&next->prev_finished);
1790 }
1791 spin_unlock(&async_scan_lock);
1792
Huajun Li267a6ad2012-02-12 19:59:14 +08001793 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001794 scsi_host_put(shost);
1795 kfree(data);
1796}
1797
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001798static void do_scsi_scan_host(struct Scsi_Host *shost)
1799{
1800 if (shost->hostt->scan_finished) {
1801 unsigned long start = jiffies;
1802 if (shost->hostt->scan_start)
1803 shost->hostt->scan_start(shost);
1804
1805 while (!shost->hostt->scan_finished(shost, jiffies - start))
1806 msleep(10);
1807 } else {
1808 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD,
1809 SCAN_WILD_CARD, 0);
1810 }
1811}
1812
Dan Williams6cdd5522012-07-09 19:33:35 -07001813static void do_scan_async(void *_data, async_cookie_t c)
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001814{
1815 struct async_scan_data *data = _data;
Alan Sternbc4f2402010-06-17 10:41:42 -04001816 struct Scsi_Host *shost = data->shost;
1817
1818 do_scsi_scan_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001819 scsi_finish_async_scan(data);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001820}
1821
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822/**
1823 * scsi_scan_host - scan the given adapter
1824 * @shost: adapter to scan
1825 **/
1826void scsi_scan_host(struct Scsi_Host *shost)
1827{
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001828 struct async_scan_data *data;
1829
1830 if (strncmp(scsi_scan_type, "none", 4) == 0)
1831 return;
Alan Sternbc4f2402010-06-17 10:41:42 -04001832 if (scsi_autopm_get_host(shost) < 0)
1833 return;
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001834
1835 data = scsi_prep_async_scan(shost);
1836 if (!data) {
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001837 do_scsi_scan_host(shost);
Alan Sternbc4f2402010-06-17 10:41:42 -04001838 scsi_autopm_put_host(shost);
Matthew Wilcox3e082a92006-09-28 15:19:20 -06001839 return;
1840 }
Matthew Wilcox1aa8fab2006-11-22 13:24:54 -07001841
Dan Williams6cdd5522012-07-09 19:33:35 -07001842 /* register with the async subsystem so wait_for_device_probe()
1843 * will flush this work
1844 */
1845 async_schedule(do_scan_async, data);
1846
Huajun Li267a6ad2012-02-12 19:59:14 +08001847 /* scsi_autopm_put_host(shost) is called in scsi_finish_async_scan() */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001848}
1849EXPORT_SYMBOL(scsi_scan_host);
1850
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851void scsi_forget_host(struct Scsi_Host *shost)
1852{
Alan Sterna64358d2005-07-26 10:27:10 -04001853 struct scsi_device *sdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 unsigned long flags;
1855
Alan Sterna64358d2005-07-26 10:27:10 -04001856 restart:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 spin_lock_irqsave(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001858 list_for_each_entry(sdev, &shost->__devices, siblings) {
1859 if (sdev->sdev_state == SDEV_DEL)
1860 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 spin_unlock_irqrestore(shost->host_lock, flags);
Alan Sterna64358d2005-07-26 10:27:10 -04001862 __scsi_remove_device(sdev);
1863 goto restart;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001864 }
1865 spin_unlock_irqrestore(shost->host_lock, flags);
1866}
1867
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001868/**
1869 * scsi_get_host_dev - Create a scsi_device that points to the host adapter itself
1870 * @shost: Host that needs a scsi_device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 *
1872 * Lock status: None assumed.
1873 *
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001874 * Returns: The scsi_device or NULL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 *
1876 * Notes:
Christoph Hellwigf64a1812005-10-31 18:32:08 +01001877 * Attach a single scsi_device to the Scsi_Host - this should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 * be made to look like a "pseudo-device" that points to the
1879 * HA itself.
1880 *
1881 * Note - this device is not accessible from any high-level
1882 * drivers (including generics), which is probably not
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001883 * optimal. We can add hooks later to attach.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884 */
1885struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost)
1886{
Alan Sterne517d312005-07-26 10:18:45 -04001887 struct scsi_device *sdev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 struct scsi_target *starget;
1889
Arjan van de Ven0b950672006-01-11 13:16:10 +01001890 mutex_lock(&shost->scan_mutex);
Alan Sterne517d312005-07-26 10:18:45 -04001891 if (!scsi_host_scan_allowed(shost))
1892 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id);
1894 if (!starget)
Alan Sterne517d312005-07-26 10:18:45 -04001895 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896
1897 sdev = scsi_alloc_sdev(starget, 0, NULL);
Alan Sternd5469112010-02-12 12:13:39 -05001898 if (sdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001899 sdev->borken = 0;
Alan Sternd5469112010-02-12 12:13:39 -05001900 else
James Bottomley884d25c2006-09-05 16:26:41 -05001901 scsi_target_reap(starget);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902 put_device(&starget->dev);
Alan Sterne517d312005-07-26 10:18:45 -04001903 out:
Arjan van de Ven0b950672006-01-11 13:16:10 +01001904 mutex_unlock(&shost->scan_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 return sdev;
1906}
1907EXPORT_SYMBOL(scsi_get_host_dev);
1908
Randy Dunlap9f6aa572010-05-23 17:02:30 -07001909/**
1910 * scsi_free_host_dev - Free a scsi_device that points to the host adapter itself
1911 * @sdev: Host device to be freed
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 *
1913 * Lock status: None assumed.
1914 *
1915 * Returns: Nothing
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 */
1917void scsi_free_host_dev(struct scsi_device *sdev)
1918{
1919 BUG_ON(sdev->id != sdev->host->this_id);
1920
James Bottomley860dc732009-11-19 17:48:29 -05001921 __scsi_remove_device(sdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001922}
1923EXPORT_SYMBOL(scsi_free_host_dev);
1924