Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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 |
| 12 | * device attached, a Scsi_Device is allocated and setup for it. |
| 13 | * |
| 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 |
| 20 | * Scsi_Device for it. |
| 21 | * |
| 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 | |
| 28 | #include <linux/config.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/moduleparam.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/blkdev.h> |
| 33 | #include <asm/semaphore.h> |
| 34 | |
| 35 | #include <scsi/scsi.h> |
| 36 | #include <scsi/scsi_device.h> |
| 37 | #include <scsi/scsi_driver.h> |
| 38 | #include <scsi/scsi_devinfo.h> |
| 39 | #include <scsi/scsi_host.h> |
| 40 | #include <scsi/scsi_request.h> |
| 41 | #include <scsi/scsi_transport.h> |
| 42 | #include <scsi/scsi_eh.h> |
| 43 | |
| 44 | #include "scsi_priv.h" |
| 45 | #include "scsi_logging.h" |
| 46 | |
| 47 | #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ |
| 48 | " SCSI scanning, some SCSI devices might not be configured\n" |
| 49 | |
| 50 | /* |
| 51 | * Default timeout |
| 52 | */ |
| 53 | #define SCSI_TIMEOUT (2*HZ) |
| 54 | |
| 55 | /* |
| 56 | * Prefix values for the SCSI id's (stored in driverfs name field) |
| 57 | */ |
| 58 | #define SCSI_UID_SER_NUM 'S' |
| 59 | #define SCSI_UID_UNKNOWN 'Z' |
| 60 | |
| 61 | /* |
| 62 | * Return values of some of the scanning functions. |
| 63 | * |
| 64 | * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this |
| 65 | * includes allocation or general failures preventing IO from being sent. |
| 66 | * |
| 67 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available |
| 68 | * on the given LUN. |
| 69 | * |
| 70 | * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a |
| 71 | * given LUN. |
| 72 | */ |
| 73 | #define SCSI_SCAN_NO_RESPONSE 0 |
| 74 | #define SCSI_SCAN_TARGET_PRESENT 1 |
| 75 | #define SCSI_SCAN_LUN_PRESENT 2 |
| 76 | |
| 77 | static char *scsi_null_device_strs = "nullnullnullnull"; |
| 78 | |
| 79 | #define MAX_SCSI_LUNS 512 |
| 80 | |
| 81 | #ifdef CONFIG_SCSI_MULTI_LUN |
| 82 | static unsigned int max_scsi_luns = MAX_SCSI_LUNS; |
| 83 | #else |
| 84 | static unsigned int max_scsi_luns = 1; |
| 85 | #endif |
| 86 | |
| 87 | module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR); |
| 88 | MODULE_PARM_DESC(max_luns, |
| 89 | "last scsi LUN (should be between 1 and 2^32-1)"); |
| 90 | |
| 91 | /* |
| 92 | * max_scsi_report_luns: the maximum number of LUNS that will be |
| 93 | * returned from the REPORT LUNS command. 8 times this value must |
| 94 | * be allocated. In theory this could be up to an 8 byte value, but |
| 95 | * in practice, the maximum number of LUNs suppored by any device |
| 96 | * is about 16k. |
| 97 | */ |
| 98 | static unsigned int max_scsi_report_luns = 511; |
| 99 | |
| 100 | module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR); |
| 101 | MODULE_PARM_DESC(max_report_luns, |
| 102 | "REPORT LUNS maximum number of LUNS received (should be" |
| 103 | " between 1 and 16384)"); |
| 104 | |
| 105 | static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3; |
| 106 | |
| 107 | module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR); |
| 108 | MODULE_PARM_DESC(inq_timeout, |
| 109 | "Timeout (in seconds) waiting for devices to answer INQUIRY." |
| 110 | " Default is 5. Some non-compliant devices need more."); |
| 111 | |
| 112 | /** |
| 113 | * scsi_unlock_floptical - unlock device via a special MODE SENSE command |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 114 | * @sdev: scsi device to send command to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | * @result: area to store the result of the MODE SENSE |
| 116 | * |
| 117 | * Description: |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 118 | * Send a vendor specific MODE SENSE (not a MODE SELECT) command. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | * Called for BLIST_KEY devices. |
| 120 | **/ |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 121 | static void scsi_unlock_floptical(struct scsi_device *sdev, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | unsigned char *result) |
| 123 | { |
| 124 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
| 125 | |
| 126 | printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); |
| 127 | scsi_cmd[0] = MODE_SENSE; |
| 128 | scsi_cmd[1] = 0; |
| 129 | scsi_cmd[2] = 0x2e; |
| 130 | scsi_cmd[3] = 0; |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 131 | scsi_cmd[4] = 0x2a; /* size */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | scsi_cmd[5] = 0; |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 133 | scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, |
| 134 | SCSI_TIMEOUT, 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | } |
| 136 | |
| 137 | /** |
| 138 | * print_inquiry - printk the inquiry information |
| 139 | * @inq_result: printk this SCSI INQUIRY |
| 140 | * |
| 141 | * Description: |
| 142 | * printk the vendor, model, and other information found in the |
| 143 | * INQUIRY data in @inq_result. |
| 144 | * |
| 145 | * Notes: |
| 146 | * Remove this, and replace with a hotplug event that logs any |
| 147 | * relevant information. |
| 148 | **/ |
| 149 | static void print_inquiry(unsigned char *inq_result) |
| 150 | { |
| 151 | int i; |
| 152 | |
| 153 | printk(KERN_NOTICE " Vendor: "); |
| 154 | for (i = 8; i < 16; i++) |
| 155 | if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) |
| 156 | printk("%c", inq_result[i]); |
| 157 | else |
| 158 | printk(" "); |
| 159 | |
| 160 | printk(" Model: "); |
| 161 | for (i = 16; i < 32; i++) |
| 162 | if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) |
| 163 | printk("%c", inq_result[i]); |
| 164 | else |
| 165 | printk(" "); |
| 166 | |
| 167 | printk(" Rev: "); |
| 168 | for (i = 32; i < 36; i++) |
| 169 | if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) |
| 170 | printk("%c", inq_result[i]); |
| 171 | else |
| 172 | printk(" "); |
| 173 | |
| 174 | printk("\n"); |
| 175 | |
| 176 | i = inq_result[0] & 0x1f; |
| 177 | |
| 178 | printk(KERN_NOTICE " Type: %s ", |
| 179 | i < |
| 180 | MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] : |
| 181 | "Unknown "); |
| 182 | printk(" ANSI SCSI revision: %02x", |
| 183 | inq_result[2] & 0x07); |
| 184 | if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1) |
| 185 | printk(" CCS\n"); |
| 186 | else |
| 187 | printk("\n"); |
| 188 | } |
| 189 | |
| 190 | /** |
| 191 | * scsi_alloc_sdev - allocate and setup a scsi_Device |
| 192 | * |
| 193 | * Description: |
| 194 | * Allocate, initialize for io, and return a pointer to a scsi_Device. |
| 195 | * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and |
| 196 | * adds scsi_Device to the appropriate list. |
| 197 | * |
| 198 | * Return value: |
| 199 | * scsi_Device pointer, or NULL on failure. |
| 200 | **/ |
| 201 | static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, |
| 202 | unsigned int lun, void *hostdata) |
| 203 | { |
| 204 | struct scsi_device *sdev; |
| 205 | int display_failure_msg = 1, ret; |
| 206 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 207 | |
| 208 | sdev = kmalloc(sizeof(*sdev) + shost->transportt->device_size, |
| 209 | GFP_ATOMIC); |
| 210 | if (!sdev) |
| 211 | goto out; |
| 212 | |
| 213 | memset(sdev, 0, sizeof(*sdev)); |
| 214 | sdev->vendor = scsi_null_device_strs; |
| 215 | sdev->model = scsi_null_device_strs; |
| 216 | sdev->rev = scsi_null_device_strs; |
| 217 | sdev->host = shost; |
| 218 | sdev->id = starget->id; |
| 219 | sdev->lun = lun; |
| 220 | sdev->channel = starget->channel; |
| 221 | sdev->sdev_state = SDEV_CREATED; |
| 222 | INIT_LIST_HEAD(&sdev->siblings); |
| 223 | INIT_LIST_HEAD(&sdev->same_target_siblings); |
| 224 | INIT_LIST_HEAD(&sdev->cmd_list); |
| 225 | INIT_LIST_HEAD(&sdev->starved_entry); |
| 226 | spin_lock_init(&sdev->list_lock); |
| 227 | |
| 228 | sdev->sdev_gendev.parent = get_device(&starget->dev); |
| 229 | sdev->sdev_target = starget; |
| 230 | |
| 231 | /* usually NULL and set by ->slave_alloc instead */ |
| 232 | sdev->hostdata = hostdata; |
| 233 | |
| 234 | /* if the device needs this changing, it may do so in the |
| 235 | * slave_configure function */ |
| 236 | sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; |
| 237 | |
| 238 | /* |
| 239 | * Some low level driver could use device->type |
| 240 | */ |
| 241 | sdev->type = -1; |
| 242 | |
| 243 | /* |
| 244 | * Assume that the device will have handshaking problems, |
| 245 | * and then fix this field later if it turns out it |
| 246 | * doesn't |
| 247 | */ |
| 248 | sdev->borken = 1; |
| 249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | sdev->request_queue = scsi_alloc_queue(sdev); |
| 251 | if (!sdev->request_queue) { |
| 252 | /* release fn is set up in scsi_sysfs_device_initialise, so |
| 253 | * have to free and put manually here */ |
| 254 | put_device(&starget->dev); |
| 255 | goto out; |
| 256 | } |
| 257 | |
| 258 | sdev->request_queue->queuedata = sdev; |
| 259 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); |
| 260 | |
| 261 | scsi_sysfs_device_initialize(sdev); |
| 262 | |
| 263 | if (shost->hostt->slave_alloc) { |
| 264 | ret = shost->hostt->slave_alloc(sdev); |
| 265 | if (ret) { |
| 266 | /* |
| 267 | * if LLDD reports slave not present, don't clutter |
| 268 | * console with alloc failure messages |
| 269 | |
| 270 | |
| 271 | */ |
| 272 | if (ret == -ENXIO) |
| 273 | display_failure_msg = 0; |
| 274 | goto out_device_destroy; |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | return sdev; |
| 279 | |
| 280 | out_device_destroy: |
| 281 | transport_destroy_device(&sdev->sdev_gendev); |
| 282 | scsi_free_queue(sdev->request_queue); |
| 283 | put_device(&sdev->sdev_gendev); |
| 284 | out: |
| 285 | if (display_failure_msg) |
| 286 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); |
| 287 | return NULL; |
| 288 | } |
| 289 | |
| 290 | static void scsi_target_dev_release(struct device *dev) |
| 291 | { |
| 292 | struct device *parent = dev->parent; |
| 293 | struct scsi_target *starget = to_scsi_target(dev); |
James Bottomley | a283bd3 | 2005-05-24 12:06:38 -0500 | [diff] [blame] | 294 | struct Scsi_Host *shost = dev_to_shost(parent); |
| 295 | |
| 296 | if (shost->hostt->target_destroy) |
| 297 | shost->hostt->target_destroy(starget); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | kfree(starget); |
| 299 | put_device(parent); |
| 300 | } |
| 301 | |
| 302 | int scsi_is_target_device(const struct device *dev) |
| 303 | { |
| 304 | return dev->release == scsi_target_dev_release; |
| 305 | } |
| 306 | EXPORT_SYMBOL(scsi_is_target_device); |
| 307 | |
| 308 | static struct scsi_target *__scsi_find_target(struct device *parent, |
| 309 | int channel, uint id) |
| 310 | { |
| 311 | struct scsi_target *starget, *found_starget = NULL; |
| 312 | struct Scsi_Host *shost = dev_to_shost(parent); |
| 313 | /* |
| 314 | * Search for an existing target for this sdev. |
| 315 | */ |
| 316 | list_for_each_entry(starget, &shost->__targets, siblings) { |
| 317 | if (starget->id == id && |
| 318 | starget->channel == channel) { |
| 319 | found_starget = starget; |
| 320 | break; |
| 321 | } |
| 322 | } |
| 323 | if (found_starget) |
| 324 | get_device(&found_starget->dev); |
| 325 | |
| 326 | return found_starget; |
| 327 | } |
| 328 | |
| 329 | static struct scsi_target *scsi_alloc_target(struct device *parent, |
| 330 | int channel, uint id) |
| 331 | { |
| 332 | struct Scsi_Host *shost = dev_to_shost(parent); |
| 333 | struct device *dev = NULL; |
| 334 | unsigned long flags; |
| 335 | const int size = sizeof(struct scsi_target) |
| 336 | + shost->transportt->target_size; |
James.Smart@Emulex.Com | 5c44cd2 | 2005-06-10 22:24:30 -0400 | [diff] [blame] | 337 | struct scsi_target *starget; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | struct scsi_target *found_target; |
| 339 | |
James.Smart@Emulex.Com | 5c44cd2 | 2005-06-10 22:24:30 -0400 | [diff] [blame] | 340 | /* |
| 341 | * Obtain the real parent from the transport. The transport |
| 342 | * is allowed to fail (no error) if there is nothing at that |
| 343 | * target id. |
| 344 | */ |
| 345 | if (shost->transportt->target_parent) { |
| 346 | spin_lock_irqsave(shost->host_lock, flags); |
| 347 | parent = shost->transportt->target_parent(shost, channel, id); |
| 348 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 349 | if (!parent) |
| 350 | return NULL; |
| 351 | } |
| 352 | |
| 353 | starget = kmalloc(size, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | if (!starget) { |
| 355 | printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__); |
| 356 | return NULL; |
| 357 | } |
| 358 | memset(starget, 0, size); |
| 359 | dev = &starget->dev; |
| 360 | device_initialize(dev); |
| 361 | starget->reap_ref = 1; |
| 362 | dev->parent = get_device(parent); |
| 363 | dev->release = scsi_target_dev_release; |
| 364 | sprintf(dev->bus_id, "target%d:%d:%d", |
| 365 | shost->host_no, channel, id); |
| 366 | starget->id = id; |
| 367 | starget->channel = channel; |
| 368 | INIT_LIST_HEAD(&starget->siblings); |
| 369 | INIT_LIST_HEAD(&starget->devices); |
| 370 | spin_lock_irqsave(shost->host_lock, flags); |
| 371 | |
| 372 | found_target = __scsi_find_target(parent, channel, id); |
| 373 | if (found_target) |
| 374 | goto found; |
| 375 | |
| 376 | list_add_tail(&starget->siblings, &shost->__targets); |
| 377 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 378 | /* allocate and add */ |
James Bottomley | a283bd3 | 2005-05-24 12:06:38 -0500 | [diff] [blame] | 379 | transport_setup_device(dev); |
| 380 | device_add(dev); |
| 381 | transport_add_device(dev); |
| 382 | if (shost->hostt->target_alloc) { |
| 383 | int error = shost->hostt->target_alloc(starget); |
| 384 | |
| 385 | if(error) { |
| 386 | dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); |
| 387 | /* don't want scsi_target_reap to do the final |
| 388 | * put because it will be under the host lock */ |
| 389 | get_device(dev); |
| 390 | scsi_target_reap(starget); |
| 391 | put_device(dev); |
| 392 | return NULL; |
| 393 | } |
| 394 | } |
| 395 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | return starget; |
| 397 | |
| 398 | found: |
| 399 | found_target->reap_ref++; |
| 400 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 401 | put_device(parent); |
| 402 | kfree(starget); |
| 403 | return found_target; |
| 404 | } |
| 405 | |
| 406 | /** |
| 407 | * scsi_target_reap - check to see if target is in use and destroy if not |
| 408 | * |
| 409 | * @starget: target to be checked |
| 410 | * |
| 411 | * This is used after removing a LUN or doing a last put of the target |
| 412 | * it checks atomically that nothing is using the target and removes |
| 413 | * it if so. |
| 414 | */ |
| 415 | void scsi_target_reap(struct scsi_target *starget) |
| 416 | { |
| 417 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 418 | unsigned long flags; |
| 419 | spin_lock_irqsave(shost->host_lock, flags); |
| 420 | |
| 421 | if (--starget->reap_ref == 0 && list_empty(&starget->devices)) { |
| 422 | list_del_init(&starget->siblings); |
| 423 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 424 | device_del(&starget->dev); |
| 425 | transport_unregister_device(&starget->dev); |
| 426 | put_device(&starget->dev); |
| 427 | return; |
| 428 | } |
| 429 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 430 | } |
| 431 | |
| 432 | /** |
| 433 | * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 434 | * @sdev: scsi_device to probe |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | * @inq_result: area to store the INQUIRY result |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 436 | * @result_len: len of inq_result |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | * @bflags: store any bflags found here |
| 438 | * |
| 439 | * Description: |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 440 | * Probe the lun associated with @req using a standard SCSI INQUIRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | * |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 442 | * If the INQUIRY is successful, zero is returned and the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 444 | * are copied to the Scsi_Device any flags value is stored in *@bflags. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | **/ |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 446 | static int scsi_probe_lun(struct scsi_device *sdev, char *inq_result, |
| 447 | int result_len, int *bflags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
| 450 | int first_inquiry_len, try_inquiry_len, next_inquiry_len; |
| 451 | int response_len = 0; |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 452 | int pass, count, result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | struct scsi_sense_hdr sshdr; |
| 454 | |
| 455 | *bflags = 0; |
| 456 | |
| 457 | /* Perform up to 3 passes. The first pass uses a conservative |
| 458 | * transfer length of 36 unless sdev->inquiry_len specifies a |
| 459 | * different value. */ |
| 460 | first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; |
| 461 | try_inquiry_len = first_inquiry_len; |
| 462 | pass = 1; |
| 463 | |
| 464 | next_pass: |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 465 | SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, |
| 466 | "scsi scan: INQUIRY pass %d length %d\n", |
| 467 | pass, try_inquiry_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
| 469 | /* Each pass gets up to three chances to ignore Unit Attention */ |
| 470 | for (count = 0; count < 3; ++count) { |
| 471 | memset(scsi_cmd, 0, 6); |
| 472 | scsi_cmd[0] = INQUIRY; |
| 473 | scsi_cmd[4] = (unsigned char) try_inquiry_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
| 475 | memset(inq_result, 0, try_inquiry_len); |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 476 | |
| 477 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 478 | inq_result, try_inquiry_len, &sshdr, |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 479 | HZ / 2 + HZ * scsi_inq_timeout, 3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | |
| 481 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " |
| 482 | "with code 0x%x\n", |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 483 | result ? "failed" : "successful", result)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 485 | if (result) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | /* |
| 487 | * not-ready to ready transition [asc/ascq=0x28/0x0] |
| 488 | * or power-on, reset [asc/ascq=0x29/0x0], continue. |
| 489 | * INQUIRY should not yield UNIT_ATTENTION |
| 490 | * but many buggy devices do so anyway. |
| 491 | */ |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 492 | if ((driver_byte(result) & DRIVER_SENSE) && |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 493 | scsi_sense_valid(&sshdr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | if ((sshdr.sense_key == UNIT_ATTENTION) && |
| 495 | ((sshdr.asc == 0x28) || |
| 496 | (sshdr.asc == 0x29)) && |
| 497 | (sshdr.ascq == 0)) |
| 498 | continue; |
| 499 | } |
| 500 | } |
| 501 | break; |
| 502 | } |
| 503 | |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 504 | if (result == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | response_len = (unsigned char) inq_result[4] + 5; |
| 506 | if (response_len > 255) |
| 507 | response_len = first_inquiry_len; /* sanity */ |
| 508 | |
| 509 | /* |
| 510 | * Get any flags for this device. |
| 511 | * |
| 512 | * XXX add a bflags to Scsi_Device, and replace the |
| 513 | * corresponding bit fields in Scsi_Device, so bflags |
| 514 | * need not be passed as an argument. |
| 515 | */ |
| 516 | *bflags = scsi_get_device_flags(sdev, &inq_result[8], |
| 517 | &inq_result[16]); |
| 518 | |
| 519 | /* When the first pass succeeds we gain information about |
| 520 | * what larger transfer lengths might work. */ |
| 521 | if (pass == 1) { |
| 522 | if (BLIST_INQUIRY_36 & *bflags) |
| 523 | next_inquiry_len = 36; |
| 524 | else if (BLIST_INQUIRY_58 & *bflags) |
| 525 | next_inquiry_len = 58; |
| 526 | else if (sdev->inquiry_len) |
| 527 | next_inquiry_len = sdev->inquiry_len; |
| 528 | else |
| 529 | next_inquiry_len = response_len; |
| 530 | |
| 531 | /* If more data is available perform the second pass */ |
| 532 | if (next_inquiry_len > try_inquiry_len) { |
| 533 | try_inquiry_len = next_inquiry_len; |
| 534 | pass = 2; |
| 535 | goto next_pass; |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | } else if (pass == 2) { |
| 540 | printk(KERN_INFO "scsi scan: %d byte inquiry failed. " |
| 541 | "Consider BLIST_INQUIRY_36 for this device\n", |
| 542 | try_inquiry_len); |
| 543 | |
| 544 | /* If this pass failed, the third pass goes back and transfers |
| 545 | * the same amount as we successfully got in the first pass. */ |
| 546 | try_inquiry_len = first_inquiry_len; |
| 547 | pass = 3; |
| 548 | goto next_pass; |
| 549 | } |
| 550 | |
| 551 | /* If the last transfer attempt got an error, assume the |
| 552 | * peripheral doesn't exist or is dead. */ |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 553 | if (result) |
| 554 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
| 556 | /* Don't report any more data than the device says is valid */ |
| 557 | sdev->inquiry_len = min(try_inquiry_len, response_len); |
| 558 | |
| 559 | /* |
| 560 | * XXX Abort if the response length is less than 36? If less than |
| 561 | * 32, the lookup of the device flags (above) could be invalid, |
| 562 | * and it would be possible to take an incorrect action - we do |
| 563 | * not want to hang because of a short INQUIRY. On the flip side, |
| 564 | * if the device is spun down or becoming ready (and so it gives a |
| 565 | * short INQUIRY), an abort here prevents any further use of the |
| 566 | * device, including spin up. |
| 567 | * |
| 568 | * Related to the above issue: |
| 569 | * |
| 570 | * XXX Devices (disk or all?) should be sent a TEST UNIT READY, |
| 571 | * and if not ready, sent a START_STOP to start (maybe spin up) and |
| 572 | * then send the INQUIRY again, since the INQUIRY can change after |
| 573 | * a device is initialized. |
| 574 | * |
| 575 | * Ideally, start a device if explicitly asked to do so. This |
| 576 | * assumes that a device is spun up on power on, spun down on |
| 577 | * request, and then spun up on request. |
| 578 | */ |
| 579 | |
| 580 | /* |
| 581 | * The scanning code needs to know the scsi_level, even if no |
| 582 | * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so |
| 583 | * non-zero LUNs can be scanned. |
| 584 | */ |
| 585 | sdev->scsi_level = inq_result[2] & 0x07; |
| 586 | if (sdev->scsi_level >= 2 || |
| 587 | (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) |
| 588 | sdev->scsi_level++; |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 589 | sdev->sdev_target->scsi_level = sdev->scsi_level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 591 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | /** |
| 595 | * scsi_add_lun - allocate and fully initialze a Scsi_Device |
| 596 | * @sdevscan: holds information to be stored in the new Scsi_Device |
| 597 | * @sdevnew: store the address of the newly allocated Scsi_Device |
| 598 | * @inq_result: holds the result of a previous INQUIRY to the LUN |
| 599 | * @bflags: black/white list flag |
| 600 | * |
| 601 | * Description: |
| 602 | * Allocate and initialize a Scsi_Device matching sdevscan. Optionally |
| 603 | * set fields based on values in *@bflags. If @sdevnew is not |
| 604 | * NULL, store the address of the new Scsi_Device in *@sdevnew (needed |
| 605 | * when scanning a particular LUN). |
| 606 | * |
| 607 | * Return: |
| 608 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device |
| 609 | * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized |
| 610 | **/ |
| 611 | static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags) |
| 612 | { |
| 613 | /* |
| 614 | * XXX do not save the inquiry, since it can change underneath us, |
| 615 | * save just vendor/model/rev. |
| 616 | * |
| 617 | * Rather than save it and have an ioctl that retrieves the saved |
| 618 | * value, have an ioctl that executes the same INQUIRY code used |
| 619 | * in scsi_probe_lun, let user level programs doing INQUIRY |
| 620 | * scanning run at their own risk, or supply a user level program |
| 621 | * that can correctly scan. |
| 622 | */ |
| 623 | sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC); |
| 624 | if (sdev->inquiry == NULL) { |
| 625 | return SCSI_SCAN_NO_RESPONSE; |
| 626 | } |
| 627 | |
| 628 | memcpy(sdev->inquiry, inq_result, sdev->inquiry_len); |
| 629 | sdev->vendor = (char *) (sdev->inquiry + 8); |
| 630 | sdev->model = (char *) (sdev->inquiry + 16); |
| 631 | sdev->rev = (char *) (sdev->inquiry + 32); |
| 632 | |
| 633 | if (*bflags & BLIST_ISROM) { |
| 634 | /* |
| 635 | * It would be better to modify sdev->type, and set |
| 636 | * sdev->removable, but then the print_inquiry() output |
| 637 | * would not show TYPE_ROM; if print_inquiry() is removed |
| 638 | * the issue goes away. |
| 639 | */ |
| 640 | inq_result[0] = TYPE_ROM; |
| 641 | inq_result[1] |= 0x80; /* removable */ |
| 642 | } else if (*bflags & BLIST_NO_ULD_ATTACH) |
| 643 | sdev->no_uld_attach = 1; |
| 644 | |
| 645 | switch (sdev->type = (inq_result[0] & 0x1f)) { |
| 646 | case TYPE_TAPE: |
| 647 | case TYPE_DISK: |
| 648 | case TYPE_PRINTER: |
| 649 | case TYPE_MOD: |
| 650 | case TYPE_PROCESSOR: |
| 651 | case TYPE_SCANNER: |
| 652 | case TYPE_MEDIUM_CHANGER: |
| 653 | case TYPE_ENCLOSURE: |
| 654 | case TYPE_COMM: |
Al Viro | 631e8a1 | 2005-05-16 01:59:55 +0100 | [diff] [blame] | 655 | case TYPE_RBC: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | sdev->writeable = 1; |
| 657 | break; |
| 658 | case TYPE_WORM: |
| 659 | case TYPE_ROM: |
| 660 | sdev->writeable = 0; |
| 661 | break; |
| 662 | default: |
| 663 | printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); |
| 664 | } |
| 665 | |
| 666 | print_inquiry(inq_result); |
| 667 | |
| 668 | /* |
| 669 | * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI |
| 670 | * spec says: The device server is capable of supporting the |
| 671 | * specified peripheral device type on this logical unit. However, |
| 672 | * the physical device is not currently connected to this logical |
| 673 | * unit. |
| 674 | * |
| 675 | * The above is vague, as it implies that we could treat 001 and |
| 676 | * 011 the same. Stay compatible with previous code, and create a |
| 677 | * Scsi_Device for a PQ of 1 |
| 678 | * |
| 679 | * Don't set the device offline here; rather let the upper |
| 680 | * level drivers eval the PQ to decide whether they should |
| 681 | * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. |
| 682 | */ |
| 683 | |
| 684 | sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; |
| 685 | sdev->removable = (0x80 & inq_result[1]) >> 7; |
| 686 | sdev->lockable = sdev->removable; |
| 687 | sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); |
| 688 | |
| 689 | if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 && |
| 690 | inq_result[56] & 0x04)) |
| 691 | sdev->ppr = 1; |
| 692 | if (inq_result[7] & 0x60) |
| 693 | sdev->wdtr = 1; |
| 694 | if (inq_result[7] & 0x10) |
| 695 | sdev->sdtr = 1; |
| 696 | |
| 697 | sprintf(sdev->devfs_name, "scsi/host%d/bus%d/target%d/lun%d", |
| 698 | sdev->host->host_no, sdev->channel, |
| 699 | sdev->id, sdev->lun); |
| 700 | |
| 701 | /* |
| 702 | * End driverfs/devfs code. |
| 703 | */ |
| 704 | |
| 705 | if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && |
| 706 | !(*bflags & BLIST_NOTQ)) |
| 707 | sdev->tagged_supported = 1; |
| 708 | /* |
| 709 | * Some devices (Texel CD ROM drives) have handshaking problems |
| 710 | * when used with the Seagate controllers. borken is initialized |
| 711 | * to 1, and then set it to 0 here. |
| 712 | */ |
| 713 | if ((*bflags & BLIST_BORKEN) == 0) |
| 714 | sdev->borken = 0; |
| 715 | |
| 716 | /* |
| 717 | * Apparently some really broken devices (contrary to the SCSI |
| 718 | * standards) need to be selected without asserting ATN |
| 719 | */ |
| 720 | if (*bflags & BLIST_SELECT_NO_ATN) |
| 721 | sdev->select_no_atn = 1; |
| 722 | |
| 723 | /* |
| 724 | * Some devices may not want to have a start command automatically |
| 725 | * issued when a device is added. |
| 726 | */ |
| 727 | if (*bflags & BLIST_NOSTARTONADD) |
| 728 | sdev->no_start_on_add = 1; |
| 729 | |
| 730 | if (*bflags & BLIST_SINGLELUN) |
| 731 | sdev->single_lun = 1; |
| 732 | |
| 733 | |
| 734 | sdev->use_10_for_rw = 1; |
| 735 | |
| 736 | if (*bflags & BLIST_MS_SKIP_PAGE_08) |
| 737 | sdev->skip_ms_page_8 = 1; |
| 738 | |
| 739 | if (*bflags & BLIST_MS_SKIP_PAGE_3F) |
| 740 | sdev->skip_ms_page_3f = 1; |
| 741 | |
| 742 | if (*bflags & BLIST_USE_10_BYTE_MS) |
| 743 | sdev->use_10_for_ms = 1; |
| 744 | |
| 745 | /* set the device running here so that slave configure |
| 746 | * may do I/O */ |
| 747 | scsi_device_set_state(sdev, SDEV_RUNNING); |
| 748 | |
| 749 | if (*bflags & BLIST_MS_192_BYTES_FOR_3F) |
| 750 | sdev->use_192_bytes_for_3f = 1; |
| 751 | |
| 752 | if (*bflags & BLIST_NOT_LOCKABLE) |
| 753 | sdev->lockable = 0; |
| 754 | |
| 755 | if (*bflags & BLIST_RETRY_HWERROR) |
| 756 | sdev->retry_hwerror = 1; |
| 757 | |
| 758 | transport_configure_device(&sdev->sdev_gendev); |
| 759 | |
| 760 | if (sdev->host->hostt->slave_configure) |
| 761 | sdev->host->hostt->slave_configure(sdev); |
| 762 | |
| 763 | /* |
| 764 | * Ok, the device is now all set up, we can |
| 765 | * register it and tell the rest of the kernel |
| 766 | * about it. |
| 767 | */ |
Alan Stern | b24b103 | 2005-07-27 11:43:46 -0700 | [diff] [blame] | 768 | if (scsi_sysfs_add_sdev(sdev) != 0) |
| 769 | return SCSI_SCAN_NO_RESPONSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
| 771 | return SCSI_SCAN_LUN_PRESENT; |
| 772 | } |
| 773 | |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 774 | static inline void scsi_destroy_sdev(struct scsi_device *sdev) |
| 775 | { |
| 776 | if (sdev->host->hostt->slave_destroy) |
| 777 | sdev->host->hostt->slave_destroy(sdev); |
| 778 | transport_destroy_device(&sdev->sdev_gendev); |
| 779 | put_device(&sdev->sdev_gendev); |
| 780 | } |
| 781 | |
| 782 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | /** |
| 784 | * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it |
| 785 | * @starget: pointer to target device structure |
| 786 | * @lun: LUN of target device |
| 787 | * @sdevscan: probe the LUN corresponding to this Scsi_Device |
| 788 | * @sdevnew: store the value of any new Scsi_Device allocated |
| 789 | * @bflagsp: store bflags here if not NULL |
| 790 | * |
| 791 | * Description: |
| 792 | * Call scsi_probe_lun, if a LUN with an attached device is found, |
| 793 | * allocate and set it up by calling scsi_add_lun. |
| 794 | * |
| 795 | * Return: |
| 796 | * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a Scsi_Device |
| 797 | * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is |
| 798 | * attached at the LUN |
| 799 | * SCSI_SCAN_LUN_PRESENT: a new Scsi_Device was allocated and initialized |
| 800 | **/ |
| 801 | static int scsi_probe_and_add_lun(struct scsi_target *starget, |
| 802 | uint lun, int *bflagsp, |
| 803 | struct scsi_device **sdevp, int rescan, |
| 804 | void *hostdata) |
| 805 | { |
| 806 | struct scsi_device *sdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | unsigned char *result; |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 808 | int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 810 | |
| 811 | /* |
| 812 | * The rescan flag is used as an optimization, the first scan of a |
| 813 | * host adapter calls into here with rescan == 0. |
| 814 | */ |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 815 | sdev = scsi_device_lookup_by_target(starget, lun); |
| 816 | if (sdev) { |
| 817 | if (rescan || sdev->sdev_state != SDEV_CREATED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
| 819 | "scsi scan: device exists on %s\n", |
| 820 | sdev->sdev_gendev.bus_id)); |
| 821 | if (sdevp) |
| 822 | *sdevp = sdev; |
| 823 | else |
| 824 | scsi_device_put(sdev); |
| 825 | |
| 826 | if (bflagsp) |
| 827 | *bflagsp = scsi_get_device_flags(sdev, |
| 828 | sdev->vendor, |
| 829 | sdev->model); |
| 830 | return SCSI_SCAN_LUN_PRESENT; |
| 831 | } |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 832 | scsi_device_put(sdev); |
| 833 | } else |
| 834 | sdev = scsi_alloc_sdev(starget, lun, hostdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | if (!sdev) |
| 836 | goto out; |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 837 | |
| 838 | result = kmalloc(result_len, GFP_ATOMIC | |
Al Viro | bc86120 | 2005-04-24 12:28:34 -0700 | [diff] [blame] | 839 | ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | if (!result) |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 841 | goto out_free_sdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 843 | if (scsi_probe_lun(sdev, result, result_len, &bflags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | goto out_free_result; |
| 845 | |
| 846 | /* |
| 847 | * result contains valid SCSI INQUIRY data. |
| 848 | */ |
| 849 | if ((result[0] >> 5) == 3) { |
| 850 | /* |
| 851 | * For a Peripheral qualifier 3 (011b), the SCSI |
| 852 | * spec says: The device server is not capable of |
| 853 | * supporting a physical device on this logical |
| 854 | * unit. |
| 855 | * |
| 856 | * For disks, this implies that there is no |
| 857 | * logical disk configured at sdev->lun, but there |
| 858 | * is a target id responding. |
| 859 | */ |
| 860 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO |
| 861 | "scsi scan: peripheral qualifier of 3," |
| 862 | " no device added\n")); |
| 863 | res = SCSI_SCAN_TARGET_PRESENT; |
| 864 | goto out_free_result; |
| 865 | } |
| 866 | |
| 867 | res = scsi_add_lun(sdev, result, &bflags); |
| 868 | if (res == SCSI_SCAN_LUN_PRESENT) { |
| 869 | if (bflags & BLIST_KEY) { |
| 870 | sdev->lockable = 0; |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 871 | scsi_unlock_floptical(sdev, result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | } |
| 873 | if (bflagsp) |
| 874 | *bflagsp = bflags; |
| 875 | } |
| 876 | |
| 877 | out_free_result: |
| 878 | kfree(result); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | out_free_sdev: |
| 880 | if (res == SCSI_SCAN_LUN_PRESENT) { |
| 881 | if (sdevp) { |
Alan Stern | b70d37b | 2005-07-26 10:30:40 -0400 | [diff] [blame] | 882 | if (scsi_device_get(sdev) == 0) { |
| 883 | *sdevp = sdev; |
| 884 | } else { |
| 885 | __scsi_remove_device(sdev); |
| 886 | res = SCSI_SCAN_NO_RESPONSE; |
| 887 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | } |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 889 | } else |
| 890 | scsi_destroy_sdev(sdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | out: |
| 892 | return res; |
| 893 | } |
| 894 | |
| 895 | /** |
| 896 | * scsi_sequential_lun_scan - sequentially scan a SCSI target |
| 897 | * @starget: pointer to target structure to scan |
| 898 | * @bflags: black/white list flag for LUN 0 |
| 899 | * @lun0_res: result of scanning LUN 0 |
| 900 | * |
| 901 | * Description: |
| 902 | * Generally, scan from LUN 1 (LUN 0 is assumed to already have been |
| 903 | * scanned) to some maximum lun until a LUN is found with no device |
| 904 | * attached. Use the bflags to figure out any oddities. |
| 905 | * |
| 906 | * Modifies sdevscan->lun. |
| 907 | **/ |
| 908 | static void scsi_sequential_lun_scan(struct scsi_target *starget, |
| 909 | int bflags, int lun0_res, int scsi_level, |
| 910 | int rescan) |
| 911 | { |
| 912 | unsigned int sparse_lun, lun, max_dev_lun; |
| 913 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 914 | |
| 915 | SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" |
| 916 | "%s\n", starget->dev.bus_id)); |
| 917 | |
| 918 | max_dev_lun = min(max_scsi_luns, shost->max_lun); |
| 919 | /* |
| 920 | * If this device is known to support sparse multiple units, |
| 921 | * override the other settings, and scan all of them. Normally, |
| 922 | * SCSI-3 devices should be scanned via the REPORT LUNS. |
| 923 | */ |
| 924 | if (bflags & BLIST_SPARSELUN) { |
| 925 | max_dev_lun = shost->max_lun; |
| 926 | sparse_lun = 1; |
| 927 | } else |
| 928 | sparse_lun = 0; |
| 929 | |
| 930 | /* |
| 931 | * If not sparse lun and no device attached at LUN 0 do not scan |
| 932 | * any further. |
| 933 | */ |
| 934 | if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT)) |
| 935 | return; |
| 936 | |
| 937 | /* |
| 938 | * If less than SCSI_1_CSS, and no special lun scaning, stop |
| 939 | * scanning; this matches 2.4 behaviour, but could just be a bug |
| 940 | * (to continue scanning a SCSI_1_CSS device). |
| 941 | * |
| 942 | * This test is broken. We might not have any device on lun0 for |
| 943 | * a sparselun device, and if that's the case then how would we |
| 944 | * know the real scsi_level, eh? It might make sense to just not |
| 945 | * scan any SCSI_1 device for non-0 luns, but that check would best |
| 946 | * go into scsi_alloc_sdev() and just have it return null when asked |
| 947 | * to alloc an sdev for lun > 0 on an already found SCSI_1 device. |
| 948 | * |
| 949 | if ((sdevscan->scsi_level < SCSI_1_CCS) && |
| 950 | ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) |
| 951 | == 0)) |
| 952 | return; |
| 953 | */ |
| 954 | /* |
| 955 | * If this device is known to support multiple units, override |
| 956 | * the other settings, and scan all of them. |
| 957 | */ |
| 958 | if (bflags & BLIST_FORCELUN) |
| 959 | max_dev_lun = shost->max_lun; |
| 960 | /* |
| 961 | * REGAL CDC-4X: avoid hang after LUN 4 |
| 962 | */ |
| 963 | if (bflags & BLIST_MAX5LUN) |
| 964 | max_dev_lun = min(5U, max_dev_lun); |
| 965 | /* |
| 966 | * Do not scan SCSI-2 or lower device past LUN 7, unless |
| 967 | * BLIST_LARGELUN. |
| 968 | */ |
| 969 | if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) |
| 970 | max_dev_lun = min(8U, max_dev_lun); |
| 971 | |
| 972 | /* |
| 973 | * We have already scanned LUN 0, so start at LUN 1. Keep scanning |
| 974 | * until we reach the max, or no LUN is found and we are not |
| 975 | * sparse_lun. |
| 976 | */ |
| 977 | for (lun = 1; lun < max_dev_lun; ++lun) |
| 978 | if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, |
| 979 | NULL) != SCSI_SCAN_LUN_PRESENT) && |
| 980 | !sparse_lun) |
| 981 | return; |
| 982 | } |
| 983 | |
| 984 | /** |
| 985 | * scsilun_to_int: convert a scsi_lun to an int |
| 986 | * @scsilun: struct scsi_lun to be converted. |
| 987 | * |
| 988 | * Description: |
| 989 | * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered |
| 990 | * integer, and return the result. The caller must check for |
| 991 | * truncation before using this function. |
| 992 | * |
| 993 | * Notes: |
| 994 | * The struct scsi_lun is assumed to be four levels, with each level |
| 995 | * effectively containing a SCSI byte-ordered (big endian) short; the |
| 996 | * addressing bits of each level are ignored (the highest two bits). |
| 997 | * For a description of the LUN format, post SCSI-3 see the SCSI |
| 998 | * Architecture Model, for SCSI-3 see the SCSI Controller Commands. |
| 999 | * |
| 1000 | * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns |
| 1001 | * the integer: 0x0b030a04 |
| 1002 | **/ |
| 1003 | static int scsilun_to_int(struct scsi_lun *scsilun) |
| 1004 | { |
| 1005 | int i; |
| 1006 | unsigned int lun; |
| 1007 | |
| 1008 | lun = 0; |
| 1009 | for (i = 0; i < sizeof(lun); i += 2) |
| 1010 | lun = lun | (((scsilun->scsi_lun[i] << 8) | |
| 1011 | scsilun->scsi_lun[i + 1]) << (i * 8)); |
| 1012 | return lun; |
| 1013 | } |
| 1014 | |
| 1015 | /** |
James.Smart@Emulex.Com | 2f4701d | 2005-07-13 22:05:03 -0400 | [diff] [blame] | 1016 | * int_to_scsilun: reverts an int into a scsi_lun |
| 1017 | * @int: integer to be reverted |
| 1018 | * @scsilun: struct scsi_lun to be set. |
| 1019 | * |
| 1020 | * Description: |
| 1021 | * Reverts the functionality of the scsilun_to_int, which packed |
| 1022 | * an 8-byte lun value into an int. This routine unpacks the int |
| 1023 | * back into the lun value. |
| 1024 | * Note: the scsilun_to_int() routine does not truly handle all |
| 1025 | * 8bytes of the lun value. This functions restores only as much |
| 1026 | * as was set by the routine. |
| 1027 | * |
| 1028 | * Notes: |
| 1029 | * Given an integer : 0x0b030a04, this function returns a |
| 1030 | * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 |
| 1031 | * |
| 1032 | **/ |
| 1033 | void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) |
| 1034 | { |
| 1035 | int i; |
| 1036 | |
| 1037 | memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); |
| 1038 | |
| 1039 | for (i = 0; i < sizeof(lun); i += 2) { |
| 1040 | scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; |
| 1041 | scsilun->scsi_lun[i+1] = lun & 0xFF; |
| 1042 | lun = lun >> 16; |
| 1043 | } |
| 1044 | } |
| 1045 | EXPORT_SYMBOL(int_to_scsilun); |
| 1046 | |
| 1047 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | * scsi_report_lun_scan - Scan using SCSI REPORT LUN results |
| 1049 | * @sdevscan: scan the host, channel, and id of this Scsi_Device |
| 1050 | * |
| 1051 | * Description: |
| 1052 | * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN |
| 1053 | * command, and scan the resulting list of LUNs by calling |
| 1054 | * scsi_probe_and_add_lun. |
| 1055 | * |
| 1056 | * Modifies sdevscan->lun. |
| 1057 | * |
| 1058 | * Return: |
| 1059 | * 0: scan completed (or no memory, so further scanning is futile) |
| 1060 | * 1: no report lun scan, or not configured |
| 1061 | **/ |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1062 | static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1063 | int rescan) |
| 1064 | { |
| 1065 | char devname[64]; |
| 1066 | unsigned char scsi_cmd[MAX_COMMAND_SIZE]; |
| 1067 | unsigned int length; |
| 1068 | unsigned int lun; |
| 1069 | unsigned int num_luns; |
| 1070 | unsigned int retries; |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 1071 | int result; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | struct scsi_lun *lunp, *lun_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | u8 *data; |
| 1074 | struct scsi_sense_hdr sshdr; |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1075 | struct scsi_device *sdev; |
| 1076 | struct Scsi_Host *shost = dev_to_shost(&starget->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | |
| 1078 | /* |
| 1079 | * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. |
| 1080 | * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does |
| 1081 | * support more than 8 LUNs. |
| 1082 | */ |
| 1083 | if ((bflags & BLIST_NOREPORTLUN) || |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1084 | starget->scsi_level < SCSI_2 || |
| 1085 | (starget->scsi_level < SCSI_3 && |
| 1086 | (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | return 1; |
| 1088 | if (bflags & BLIST_NOLUN) |
| 1089 | return 0; |
| 1090 | |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1091 | if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { |
| 1092 | sdev = scsi_alloc_sdev(starget, 0, NULL); |
| 1093 | if (!sdev) |
| 1094 | return 0; |
| 1095 | if (scsi_device_get(sdev)) |
| 1096 | return 0; |
| 1097 | } |
| 1098 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | sprintf(devname, "host %d channel %d id %d", |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1100 | shost->host_no, sdev->channel, sdev->id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | |
| 1102 | /* |
| 1103 | * Allocate enough to hold the header (the same size as one scsi_lun) |
| 1104 | * plus the max number of luns we are requesting. |
| 1105 | * |
| 1106 | * Reallocating and trying again (with the exact amount we need) |
| 1107 | * would be nice, but then we need to somehow limit the size |
| 1108 | * allocated based on the available memory and the limits of |
| 1109 | * kmalloc - we don't want a kmalloc() failure of a huge value to |
| 1110 | * prevent us from finding any LUNs on this target. |
| 1111 | */ |
| 1112 | length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); |
| 1113 | lun_data = kmalloc(length, GFP_ATOMIC | |
| 1114 | (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1115 | if (!lun_data) { |
| 1116 | printk(ALLOC_FAILURE_MSG, __FUNCTION__); |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 1117 | goto out; |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1118 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | |
| 1120 | scsi_cmd[0] = REPORT_LUNS; |
| 1121 | |
| 1122 | /* |
| 1123 | * bytes 1 - 5: reserved, set to zero. |
| 1124 | */ |
| 1125 | memset(&scsi_cmd[1], 0, 5); |
| 1126 | |
| 1127 | /* |
| 1128 | * bytes 6 - 9: length of the command. |
| 1129 | */ |
| 1130 | scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; |
| 1131 | scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; |
| 1132 | scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; |
| 1133 | scsi_cmd[9] = (unsigned char) length & 0xff; |
| 1134 | |
| 1135 | scsi_cmd[10] = 0; /* reserved */ |
| 1136 | scsi_cmd[11] = 0; /* control */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | |
| 1138 | /* |
| 1139 | * We can get a UNIT ATTENTION, for example a power on/reset, so |
| 1140 | * retry a few times (like sd.c does for TEST UNIT READY). |
| 1141 | * Experience shows some combinations of adapter/devices get at |
| 1142 | * least two power on/resets. |
| 1143 | * |
| 1144 | * Illegal requests (for devices that do not support REPORT LUNS) |
| 1145 | * should come through as a check condition, and will not generate |
| 1146 | * a retry. |
| 1147 | */ |
| 1148 | for (retries = 0; retries < 3; retries++) { |
| 1149 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" |
| 1150 | " REPORT LUNS to %s (try %d)\n", devname, |
| 1151 | retries)); |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 1152 | |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 1153 | result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1154 | lun_data, length, &sshdr, |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 1155 | SCSI_TIMEOUT + 4 * HZ, 3); |
| 1156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 1158 | " %s (try %d) result 0x%x\n", result |
| 1159 | ? "failed" : "successful", retries, result)); |
| 1160 | if (result == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | break; |
James Bottomley | ea73a9f | 2005-08-28 11:33:52 -0500 | [diff] [blame] | 1162 | else if (scsi_sense_valid(&sshdr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | if (sshdr.sense_key != UNIT_ATTENTION) |
| 1164 | break; |
| 1165 | } |
| 1166 | } |
| 1167 | |
James Bottomley | 3921603 | 2005-06-15 18:48:29 -0500 | [diff] [blame] | 1168 | if (result) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | /* |
| 1170 | * The device probably does not support a REPORT LUN command |
| 1171 | */ |
| 1172 | kfree(lun_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | return 1; |
| 1174 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | |
| 1176 | /* |
| 1177 | * Get the length from the first four bytes of lun_data. |
| 1178 | */ |
| 1179 | data = (u8 *) lun_data->scsi_lun; |
| 1180 | length = ((data[0] << 24) | (data[1] << 16) | |
| 1181 | (data[2] << 8) | (data[3] << 0)); |
| 1182 | |
| 1183 | num_luns = (length / sizeof(struct scsi_lun)); |
| 1184 | if (num_luns > max_scsi_report_luns) { |
| 1185 | printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" |
| 1186 | " of %d luns reported, try increasing" |
| 1187 | " max_scsi_report_luns.\n", devname, |
| 1188 | max_scsi_report_luns, num_luns); |
| 1189 | num_luns = max_scsi_report_luns; |
| 1190 | } |
| 1191 | |
| 1192 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUN scan of" |
| 1193 | " host %d channel %d id %d\n", sdev->host->host_no, |
| 1194 | sdev->channel, sdev->id)); |
| 1195 | |
| 1196 | /* |
| 1197 | * Scan the luns in lun_data. The entry at offset 0 is really |
| 1198 | * the header, so start at 1 and go up to and including num_luns. |
| 1199 | */ |
| 1200 | for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { |
| 1201 | lun = scsilun_to_int(lunp); |
| 1202 | |
| 1203 | /* |
| 1204 | * Check if the unused part of lunp is non-zero, and so |
| 1205 | * does not fit in lun. |
| 1206 | */ |
| 1207 | if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { |
| 1208 | int i; |
| 1209 | |
| 1210 | /* |
| 1211 | * Output an error displaying the LUN in byte order, |
| 1212 | * this differs from what linux would print for the |
| 1213 | * integer LUN value. |
| 1214 | */ |
| 1215 | printk(KERN_WARNING "scsi: %s lun 0x", devname); |
| 1216 | data = (char *)lunp->scsi_lun; |
| 1217 | for (i = 0; i < sizeof(struct scsi_lun); i++) |
| 1218 | printk("%02x", data[i]); |
| 1219 | printk(" has a LUN larger than currently supported.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | } else if (lun > sdev->host->max_lun) { |
| 1221 | printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" |
| 1222 | " than allowed by the host adapter\n", |
| 1223 | devname, lun); |
| 1224 | } else { |
| 1225 | int res; |
| 1226 | |
| 1227 | res = scsi_probe_and_add_lun(starget, |
| 1228 | lun, NULL, NULL, rescan, NULL); |
| 1229 | if (res == SCSI_SCAN_NO_RESPONSE) { |
| 1230 | /* |
| 1231 | * Got some results, but now none, abort. |
| 1232 | */ |
| 1233 | printk(KERN_ERR "scsi: Unexpected response" |
| 1234 | " from %s lun %d while scanning, scan" |
| 1235 | " aborted\n", devname, lun); |
| 1236 | break; |
| 1237 | } |
| 1238 | } |
| 1239 | } |
| 1240 | |
| 1241 | kfree(lun_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | out: |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1243 | scsi_device_put(sdev); |
| 1244 | if (sdev->sdev_state == SDEV_CREATED) |
| 1245 | /* |
| 1246 | * the sdev we used didn't appear in the report luns scan |
| 1247 | */ |
| 1248 | scsi_destroy_sdev(sdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | return 0; |
| 1250 | } |
| 1251 | |
| 1252 | struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, |
| 1253 | uint id, uint lun, void *hostdata) |
| 1254 | { |
| 1255 | struct scsi_device *sdev; |
| 1256 | struct device *parent = &shost->shost_gendev; |
| 1257 | int res; |
| 1258 | struct scsi_target *starget = scsi_alloc_target(parent, channel, id); |
| 1259 | |
| 1260 | if (!starget) |
| 1261 | return ERR_PTR(-ENOMEM); |
| 1262 | |
Nathan Lynch | c92715b | 2005-06-02 17:15:09 -0500 | [diff] [blame] | 1263 | get_device(&starget->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | down(&shost->scan_mutex); |
Mike Anderson | 82f2946 | 2005-06-16 11:14:33 -0700 | [diff] [blame] | 1265 | if (scsi_host_scan_allowed(shost)) { |
| 1266 | res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, |
| 1267 | hostdata); |
| 1268 | if (res != SCSI_SCAN_LUN_PRESENT) |
| 1269 | sdev = ERR_PTR(-ENODEV); |
| 1270 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | up(&shost->scan_mutex); |
| 1272 | scsi_target_reap(starget); |
| 1273 | put_device(&starget->dev); |
| 1274 | |
| 1275 | return sdev; |
| 1276 | } |
| 1277 | EXPORT_SYMBOL(__scsi_add_device); |
| 1278 | |
James Bottomley | 146f726 | 2005-09-10 12:44:09 -0500 | [diff] [blame] | 1279 | int scsi_add_device(struct Scsi_Host *host, uint channel, |
| 1280 | uint target, uint lun) |
| 1281 | { |
| 1282 | struct scsi_device *sdev = |
| 1283 | __scsi_add_device(host, channel, target, lun, NULL); |
| 1284 | if (IS_ERR(sdev)) |
| 1285 | return PTR_ERR(sdev); |
| 1286 | |
| 1287 | scsi_device_put(sdev); |
| 1288 | return 0; |
| 1289 | } |
| 1290 | EXPORT_SYMBOL(scsi_add_device); |
| 1291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | void scsi_rescan_device(struct device *dev) |
| 1293 | { |
| 1294 | struct scsi_driver *drv; |
| 1295 | |
| 1296 | if (!dev->driver) |
| 1297 | return; |
| 1298 | |
| 1299 | drv = to_scsi_driver(dev->driver); |
| 1300 | if (try_module_get(drv->owner)) { |
| 1301 | if (drv->rescan) |
| 1302 | drv->rescan(dev); |
| 1303 | module_put(drv->owner); |
| 1304 | } |
| 1305 | } |
| 1306 | EXPORT_SYMBOL(scsi_rescan_device); |
| 1307 | |
Alan Stern | e517d31 | 2005-07-26 10:18:45 -0400 | [diff] [blame] | 1308 | static void __scsi_scan_target(struct device *parent, unsigned int channel, |
| 1309 | unsigned int id, unsigned int lun, int rescan) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | { |
| 1311 | struct Scsi_Host *shost = dev_to_shost(parent); |
| 1312 | int bflags = 0; |
| 1313 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | struct scsi_target *starget; |
| 1315 | |
| 1316 | if (shost->this_id == id) |
| 1317 | /* |
| 1318 | * Don't scan the host adapter |
| 1319 | */ |
| 1320 | return; |
| 1321 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1322 | starget = scsi_alloc_target(parent, channel, id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | if (!starget) |
| 1324 | return; |
| 1325 | |
| 1326 | get_device(&starget->dev); |
| 1327 | if (lun != SCAN_WILD_CARD) { |
| 1328 | /* |
| 1329 | * Scan for a specific host/chan/id/lun. |
| 1330 | */ |
| 1331 | scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); |
| 1332 | goto out_reap; |
| 1333 | } |
| 1334 | |
| 1335 | /* |
| 1336 | * Scan LUN 0, if there is some response, scan further. Ideally, we |
| 1337 | * would not configure LUN 0 until all LUNs are scanned. |
| 1338 | */ |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1339 | res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); |
| 1340 | if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { |
| 1341 | if (scsi_report_lun_scan(starget, bflags, rescan) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | /* |
| 1343 | * The REPORT LUN did not scan the target, |
| 1344 | * do a sequential scan. |
| 1345 | */ |
| 1346 | scsi_sequential_lun_scan(starget, bflags, |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1347 | res, starget->scsi_level, rescan); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | |
| 1350 | out_reap: |
| 1351 | /* now determine if the target has any children at all |
| 1352 | * and if not, nuke it */ |
| 1353 | scsi_target_reap(starget); |
| 1354 | |
| 1355 | put_device(&starget->dev); |
| 1356 | } |
Alan Stern | e517d31 | 2005-07-26 10:18:45 -0400 | [diff] [blame] | 1357 | |
| 1358 | /** |
| 1359 | * scsi_scan_target - scan a target id, possibly including all LUNs on the |
| 1360 | * target. |
| 1361 | * @parent: host to scan |
| 1362 | * @channel: channel to scan |
| 1363 | * @id: target id to scan |
| 1364 | * @lun: Specific LUN to scan or SCAN_WILD_CARD |
| 1365 | * @rescan: passed to LUN scanning routines |
| 1366 | * |
| 1367 | * Description: |
| 1368 | * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, |
| 1369 | * and possibly all LUNs on the target id. |
| 1370 | * |
| 1371 | * First try a REPORT LUN scan, if that does not scan the target, do a |
| 1372 | * sequential scan of LUNs on the target id. |
| 1373 | **/ |
| 1374 | void scsi_scan_target(struct device *parent, unsigned int channel, |
| 1375 | unsigned int id, unsigned int lun, int rescan) |
| 1376 | { |
| 1377 | struct Scsi_Host *shost = dev_to_shost(parent); |
| 1378 | |
| 1379 | down(&shost->scan_mutex); |
| 1380 | if (scsi_host_scan_allowed(shost)) |
| 1381 | __scsi_scan_target(parent, channel, id, lun, rescan); |
| 1382 | up(&shost->scan_mutex); |
| 1383 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | EXPORT_SYMBOL(scsi_scan_target); |
| 1385 | |
| 1386 | static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, |
| 1387 | unsigned int id, unsigned int lun, int rescan) |
| 1388 | { |
| 1389 | uint order_id; |
| 1390 | |
| 1391 | if (id == SCAN_WILD_CARD) |
| 1392 | for (id = 0; id < shost->max_id; ++id) { |
| 1393 | /* |
| 1394 | * XXX adapter drivers when possible (FCP, iSCSI) |
| 1395 | * could modify max_id to match the current max, |
| 1396 | * not the absolute max. |
| 1397 | * |
| 1398 | * XXX add a shost id iterator, so for example, |
| 1399 | * the FC ID can be the same as a target id |
| 1400 | * without a huge overhead of sparse id's. |
| 1401 | */ |
| 1402 | if (shost->reverse_ordering) |
| 1403 | /* |
| 1404 | * Scan from high to low id. |
| 1405 | */ |
| 1406 | order_id = shost->max_id - id - 1; |
| 1407 | else |
| 1408 | order_id = id; |
Alan Stern | e517d31 | 2005-07-26 10:18:45 -0400 | [diff] [blame] | 1409 | __scsi_scan_target(&shost->shost_gendev, channel, |
| 1410 | order_id, lun, rescan); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | } |
| 1412 | else |
Alan Stern | e517d31 | 2005-07-26 10:18:45 -0400 | [diff] [blame] | 1413 | __scsi_scan_target(&shost->shost_gendev, channel, |
| 1414 | id, lun, rescan); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | } |
| 1416 | |
| 1417 | int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, |
| 1418 | unsigned int id, unsigned int lun, int rescan) |
| 1419 | { |
| 1420 | SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "%s: <%u:%u:%u:%u>\n", |
| 1421 | __FUNCTION__, shost->host_no, channel, id, lun)); |
| 1422 | |
| 1423 | if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || |
| 1424 | ((id != SCAN_WILD_CARD) && (id > shost->max_id)) || |
| 1425 | ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) |
| 1426 | return -EINVAL; |
| 1427 | |
| 1428 | down(&shost->scan_mutex); |
Mike Anderson | 82f2946 | 2005-06-16 11:14:33 -0700 | [diff] [blame] | 1429 | if (scsi_host_scan_allowed(shost)) { |
| 1430 | if (channel == SCAN_WILD_CARD) |
| 1431 | for (channel = 0; channel <= shost->max_channel; |
| 1432 | channel++) |
| 1433 | scsi_scan_channel(shost, channel, id, lun, |
| 1434 | rescan); |
| 1435 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | scsi_scan_channel(shost, channel, id, lun, rescan); |
Mike Anderson | 82f2946 | 2005-06-16 11:14:33 -0700 | [diff] [blame] | 1437 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | up(&shost->scan_mutex); |
| 1439 | |
| 1440 | return 0; |
| 1441 | } |
| 1442 | |
| 1443 | /** |
| 1444 | * scsi_scan_host - scan the given adapter |
| 1445 | * @shost: adapter to scan |
| 1446 | **/ |
| 1447 | void scsi_scan_host(struct Scsi_Host *shost) |
| 1448 | { |
| 1449 | scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, |
| 1450 | SCAN_WILD_CARD, 0); |
| 1451 | } |
| 1452 | EXPORT_SYMBOL(scsi_scan_host); |
| 1453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | void scsi_forget_host(struct Scsi_Host *shost) |
| 1455 | { |
Alan Stern | a64358d | 2005-07-26 10:27:10 -0400 | [diff] [blame] | 1456 | struct scsi_device *sdev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | unsigned long flags; |
| 1458 | |
Alan Stern | a64358d | 2005-07-26 10:27:10 -0400 | [diff] [blame] | 1459 | restart: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | spin_lock_irqsave(shost->host_lock, flags); |
Alan Stern | a64358d | 2005-07-26 10:27:10 -0400 | [diff] [blame] | 1461 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
| 1462 | if (sdev->sdev_state == SDEV_DEL) |
| 1463 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1464 | spin_unlock_irqrestore(shost->host_lock, flags); |
Alan Stern | a64358d | 2005-07-26 10:27:10 -0400 | [diff] [blame] | 1465 | __scsi_remove_device(sdev); |
| 1466 | goto restart; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | } |
| 1468 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 1469 | } |
| 1470 | |
| 1471 | /* |
| 1472 | * Function: scsi_get_host_dev() |
| 1473 | * |
| 1474 | * Purpose: Create a Scsi_Device that points to the host adapter itself. |
| 1475 | * |
| 1476 | * Arguments: SHpnt - Host that needs a Scsi_Device |
| 1477 | * |
| 1478 | * Lock status: None assumed. |
| 1479 | * |
| 1480 | * Returns: The Scsi_Device or NULL |
| 1481 | * |
| 1482 | * Notes: |
| 1483 | * Attach a single Scsi_Device to the Scsi_Host - this should |
| 1484 | * be made to look like a "pseudo-device" that points to the |
| 1485 | * HA itself. |
| 1486 | * |
| 1487 | * Note - this device is not accessible from any high-level |
| 1488 | * drivers (including generics), which is probably not |
| 1489 | * optimal. We can add hooks later to attach |
| 1490 | */ |
| 1491 | struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) |
| 1492 | { |
Alan Stern | e517d31 | 2005-07-26 10:18:45 -0400 | [diff] [blame] | 1493 | struct scsi_device *sdev = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | struct scsi_target *starget; |
| 1495 | |
Alan Stern | e517d31 | 2005-07-26 10:18:45 -0400 | [diff] [blame] | 1496 | down(&shost->scan_mutex); |
| 1497 | if (!scsi_host_scan_allowed(shost)) |
| 1498 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); |
| 1500 | if (!starget) |
Alan Stern | e517d31 | 2005-07-26 10:18:45 -0400 | [diff] [blame] | 1501 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | |
| 1503 | sdev = scsi_alloc_sdev(starget, 0, NULL); |
| 1504 | if (sdev) { |
| 1505 | sdev->sdev_gendev.parent = get_device(&starget->dev); |
| 1506 | sdev->borken = 0; |
| 1507 | } |
| 1508 | put_device(&starget->dev); |
Alan Stern | e517d31 | 2005-07-26 10:18:45 -0400 | [diff] [blame] | 1509 | out: |
| 1510 | up(&shost->scan_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1511 | return sdev; |
| 1512 | } |
| 1513 | EXPORT_SYMBOL(scsi_get_host_dev); |
| 1514 | |
| 1515 | /* |
| 1516 | * Function: scsi_free_host_dev() |
| 1517 | * |
| 1518 | * Purpose: Free a scsi_device that points to the host adapter itself. |
| 1519 | * |
| 1520 | * Arguments: SHpnt - Host that needs a Scsi_Device |
| 1521 | * |
| 1522 | * Lock status: None assumed. |
| 1523 | * |
| 1524 | * Returns: Nothing |
| 1525 | * |
| 1526 | * Notes: |
| 1527 | */ |
| 1528 | void scsi_free_host_dev(struct scsi_device *sdev) |
| 1529 | { |
| 1530 | BUG_ON(sdev->id != sdev->host->this_id); |
| 1531 | |
James Bottomley | 6f3a202 | 2005-09-22 20:33:28 -0500 | [diff] [blame] | 1532 | scsi_destroy_sdev(sdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | } |
| 1534 | EXPORT_SYMBOL(scsi_free_host_dev); |
| 1535 | |