1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _SCSI_SCSI_DEVICE_H 3 #define _SCSI_SCSI_DEVICE_H 4 5 #include <linux/list.h> 6 #include <linux/spinlock.h> 7 #include <linux/workqueue.h> 8 #include <linux/blk-mq.h> 9 #include <scsi/scsi.h> 10 #include <linux/atomic.h> 11 #include <linux/sbitmap.h> 12 13 struct bsg_device; 14 struct device; 15 struct request_queue; 16 struct scsi_cmnd; 17 struct scsi_lun; 18 struct scsi_sense_hdr; 19 20 typedef __u64 __bitwise blist_flags_t; 21 22 #define SCSI_SENSE_BUFFERSIZE 96 23 24 struct scsi_mode_data { 25 __u32 length; 26 __u16 block_descriptor_length; 27 __u8 medium_type; 28 __u8 device_specific; 29 __u8 header_length; 30 __u8 longlba:1; 31 }; 32 33 /* 34 * sdev state: If you alter this, you also need to alter scsi_sysfs.c 35 * (for the ascii descriptions) and the state model enforcer: 36 * scsi_lib:scsi_device_set_state(). 37 */ 38 enum scsi_device_state { 39 SDEV_CREATED = 1, /* device created but not added to sysfs 40 * Only internal commands allowed (for inq) */ 41 SDEV_RUNNING, /* device properly configured 42 * All commands allowed */ 43 SDEV_CANCEL, /* beginning to delete device 44 * Only error handler commands allowed */ 45 SDEV_DEL, /* device deleted 46 * no commands allowed */ 47 SDEV_QUIESCE, /* Device quiescent. No block commands 48 * will be accepted, only specials (which 49 * originate in the mid-layer) */ 50 SDEV_OFFLINE, /* Device offlined (by error handling or 51 * user request */ 52 SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */ 53 SDEV_BLOCK, /* Device blocked by scsi lld. No 54 * scsi commands from user or midlayer 55 * should be issued to the scsi 56 * lld. */ 57 SDEV_CREATED_BLOCK, /* same as above but for created devices */ 58 }; 59 60 enum scsi_scan_mode { 61 SCSI_SCAN_INITIAL = 0, 62 SCSI_SCAN_RESCAN, 63 SCSI_SCAN_MANUAL, 64 }; 65 66 enum scsi_device_event { 67 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ 68 SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */ 69 SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */ 70 SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */ 71 SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */ 72 SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */ 73 SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */ 74 SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */ 75 76 SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE, 77 SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED, 78 79 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1 80 }; 81 82 struct scsi_event { 83 enum scsi_device_event evt_type; 84 struct list_head node; 85 86 /* put union of data structures, for non-simple event types, 87 * here 88 */ 89 }; 90 91 /** 92 * struct scsi_vpd - SCSI Vital Product Data 93 * @rcu: For kfree_rcu(). 94 * @len: Length in bytes of @data. 95 * @data: VPD data as defined in various T10 SCSI standard documents. 96 */ 97 struct scsi_vpd { 98 struct rcu_head rcu; 99 int len; 100 unsigned char data[]; 101 }; 102 103 struct scsi_device { 104 struct Scsi_Host *host; 105 struct request_queue *request_queue; 106 107 /* the next two are protected by the host->host_lock */ 108 struct list_head siblings; /* list of all devices on this host */ 109 struct list_head same_target_siblings; /* just the devices sharing same target id */ 110 111 struct sbitmap budget_map; 112 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 113 114 atomic_t restarts; 115 spinlock_t list_lock; 116 struct list_head starved_entry; 117 unsigned short queue_depth; /* How deep of a queue we want */ 118 unsigned short max_queue_depth; /* max queue depth */ 119 unsigned short last_queue_full_depth; /* These two are used by */ 120 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 121 unsigned long last_queue_full_time; /* last queue full time */ 122 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 123 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 124 125 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 126 127 unsigned int id, channel; 128 u64 lun; 129 unsigned int manufacturer; /* Manufacturer of device, for using 130 * vendor-specific cmd's */ 131 unsigned sector_size; /* size in bytes */ 132 133 void *hostdata; /* available to low-level driver */ 134 unsigned char type; 135 char scsi_level; 136 char inq_periph_qual; /* PQ from INQUIRY data */ 137 struct mutex inquiry_mutex; 138 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 139 unsigned char * inquiry; /* INQUIRY response data */ 140 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 141 const char * model; /* ... after scan; point to static string */ 142 const char * rev; /* ... "nullnullnullnull" before scan */ 143 144 #define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */ 145 struct scsi_vpd __rcu *vpd_pg0; 146 struct scsi_vpd __rcu *vpd_pg83; 147 struct scsi_vpd __rcu *vpd_pg80; 148 struct scsi_vpd __rcu *vpd_pg89; 149 struct scsi_vpd __rcu *vpd_pgb0; 150 struct scsi_vpd __rcu *vpd_pgb1; 151 struct scsi_vpd __rcu *vpd_pgb2; 152 struct scsi_vpd __rcu *vpd_pgb7; 153 154 struct scsi_target *sdev_target; 155 156 blist_flags_t sdev_bflags; /* black/white flags as also found in 157 * scsi_devinfo.[hc]. For now used only to 158 * pass settings from slave_alloc to scsi 159 * core. */ 160 unsigned int eh_timeout; /* Error handling timeout */ 161 162 /* 163 * If true, let the high-level device driver (sd) manage the device 164 * power state for system suspend/resume (suspend to RAM and 165 * hibernation) operations. 166 */ 167 unsigned manage_system_start_stop:1; 168 169 /* 170 * If true, let the high-level device driver (sd) manage the device 171 * power state for runtime device suspand and resume operations. 172 */ 173 unsigned manage_runtime_start_stop:1; 174 175 /* 176 * If true, let the high-level device driver (sd) manage the device 177 * power state for system shutdown (power off) operations. 178 */ 179 unsigned manage_shutdown:1; 180 181 /* 182 * If set and if the device is runtime suspended, ask the high-level 183 * device driver (sd) to force a runtime resume of the device. 184 */ 185 unsigned force_runtime_start_on_system_start:1; 186 187 unsigned removable:1; 188 unsigned changed:1; /* Data invalid due to media change */ 189 unsigned busy:1; /* Used to prevent races */ 190 unsigned lockable:1; /* Able to prevent media removal */ 191 unsigned locked:1; /* Media removal disabled */ 192 unsigned borken:1; /* Tell the Seagate driver to be 193 * painfully slow on this device */ 194 unsigned disconnect:1; /* can disconnect */ 195 unsigned soft_reset:1; /* Uses soft reset option */ 196 unsigned sdtr:1; /* Device supports SDTR messages */ 197 unsigned wdtr:1; /* Device supports WDTR messages */ 198 unsigned ppr:1; /* Device supports PPR messages */ 199 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 200 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 201 unsigned was_reset:1; /* There was a bus reset on the bus for 202 * this device */ 203 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 204 * because we did a bus reset. */ 205 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 206 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 207 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ 208 unsigned read_before_ms:1; /* perform a READ before MODE SENSE */ 209 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 210 unsigned no_write_same:1; /* no WRITE SAME command */ 211 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 212 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */ 213 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 214 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 215 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 216 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 217 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 218 unsigned no_start_on_add:1; /* do not issue start on add */ 219 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 220 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 221 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 222 unsigned select_no_atn:1; 223 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 224 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 225 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 226 unsigned last_sector_bug:1; /* do not use multisector accesses on 227 SD_LAST_BUGGY_SECTORS */ 228 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 229 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 230 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 231 unsigned security_supported:1; /* Supports Security Protocols */ 232 unsigned is_visible:1; /* is the device visible in sysfs */ 233 unsigned wce_default_on:1; /* Cache is ON by default */ 234 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 235 unsigned broken_fua:1; /* Don't set FUA bit */ 236 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 237 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 238 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 239 * creation time */ 240 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */ 241 unsigned silence_suspend:1; /* Do not print runtime PM related messages */ 242 unsigned no_vpd_size:1; /* No VPD size reported in header */ 243 244 unsigned cdl_supported:1; /* Command duration limits supported */ 245 unsigned cdl_enable:1; /* Enable/disable Command duration limits */ 246 247 unsigned int queue_stopped; /* request queue is quiesced */ 248 bool offline_already; /* Device offline message logged */ 249 250 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 251 252 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 253 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 254 struct list_head event_list; /* asserted events */ 255 struct work_struct event_work; 256 257 unsigned int max_device_blocked; /* what device_blocked counts down from */ 258 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 259 260 atomic_t iorequest_cnt; 261 atomic_t iodone_cnt; 262 atomic_t ioerr_cnt; 263 atomic_t iotmo_cnt; 264 265 struct device sdev_gendev, 266 sdev_dev; 267 268 struct work_struct requeue_work; 269 270 struct scsi_device_handler *handler; 271 void *handler_data; 272 273 size_t dma_drain_len; 274 void *dma_drain_buf; 275 276 unsigned int sg_timeout; 277 unsigned int sg_reserved_size; 278 279 struct bsg_device *bsg_dev; 280 unsigned char access_state; 281 struct mutex state_mutex; 282 enum scsi_device_state sdev_state; 283 struct task_struct *quiesced_by; 284 unsigned long sdev_data[]; 285 } __attribute__((aligned(sizeof(unsigned long)))); 286 287 #define to_scsi_device(d) \ 288 container_of(d, struct scsi_device, sdev_gendev) 289 #define class_to_sdev(d) \ 290 container_of(d, struct scsi_device, sdev_dev) 291 #define transport_class_to_sdev(class_dev) \ 292 to_scsi_device(class_dev->parent) 293 294 #define sdev_dbg(sdev, fmt, a...) \ 295 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 296 297 /* 298 * like scmd_printk, but the device name is passed in 299 * as a string pointer 300 */ 301 __printf(4, 5) void 302 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 303 const char *, ...); 304 305 #define sdev_printk(l, sdev, fmt, a...) \ 306 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 307 308 __printf(3, 4) void 309 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 310 311 #define scmd_dbg(scmd, fmt, a...) \ 312 do { \ 313 struct request *__rq = scsi_cmd_to_rq((scmd)); \ 314 \ 315 if (__rq->q->disk) \ 316 sdev_dbg((scmd)->device, "[%s] " fmt, \ 317 __rq->q->disk->disk_name, ##a); \ 318 else \ 319 sdev_dbg((scmd)->device, fmt, ##a); \ 320 } while (0) 321 322 enum scsi_target_state { 323 STARGET_CREATED = 1, 324 STARGET_RUNNING, 325 STARGET_REMOVE, 326 STARGET_CREATED_REMOVE, 327 STARGET_DEL, 328 }; 329 330 /* 331 * scsi_target: representation of a scsi target, for now, this is only 332 * used for single_lun devices. If no one has active IO to the target, 333 * starget_sdev_user is NULL, else it points to the active sdev. 334 */ 335 struct scsi_target { 336 struct scsi_device *starget_sdev_user; 337 struct list_head siblings; 338 struct list_head devices; 339 struct device dev; 340 struct kref reap_ref; /* last put renders target invisible */ 341 unsigned int channel; 342 unsigned int id; /* target id ... replace 343 * scsi_device.id eventually */ 344 unsigned int create:1; /* signal that it needs to be added */ 345 unsigned int single_lun:1; /* Indicates we should only 346 * allow I/O to one of the luns 347 * for the device at a time. */ 348 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 349 * means no lun present. */ 350 unsigned int no_report_luns:1; /* Don't use 351 * REPORT LUNS for scanning. */ 352 unsigned int expecting_lun_change:1; /* A device has reported 353 * a 3F/0E UA, other devices on 354 * the same target will also. */ 355 /* commands actually active on LLD. */ 356 atomic_t target_busy; 357 atomic_t target_blocked; 358 359 /* 360 * LLDs should set this in the slave_alloc host template callout. 361 * If set to zero then there is not limit. 362 */ 363 unsigned int can_queue; 364 unsigned int max_target_blocked; 365 #define SCSI_DEFAULT_TARGET_BLOCKED 3 366 367 char scsi_level; 368 enum scsi_target_state state; 369 void *hostdata; /* available to low-level driver */ 370 unsigned long starget_data[]; /* for the transport */ 371 /* starget_data must be the last element!!!! */ 372 } __attribute__((aligned(sizeof(unsigned long)))); 373 374 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) scsi_target(struct scsi_device * sdev)375 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 376 { 377 return to_scsi_target(sdev->sdev_gendev.parent); 378 } 379 #define transport_class_to_starget(class_dev) \ 380 to_scsi_target(class_dev->parent) 381 382 #define starget_printk(prefix, starget, fmt, a...) \ 383 dev_printk(prefix, &(starget)->dev, fmt, ##a) 384 385 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 386 uint, uint, u64, void *hostdata); 387 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 388 uint target, u64 lun); 389 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 390 extern void scsi_remove_device(struct scsi_device *); 391 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 392 void scsi_attach_vpd(struct scsi_device *sdev); 393 void scsi_cdl_check(struct scsi_device *sdev); 394 int scsi_cdl_enable(struct scsi_device *sdev, bool enable); 395 396 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 397 extern int __must_check scsi_device_get(struct scsi_device *); 398 extern void scsi_device_put(struct scsi_device *); 399 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 400 uint, uint, u64); 401 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 402 uint, uint, u64); 403 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 404 u64); 405 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 406 u64); 407 extern void starget_for_each_device(struct scsi_target *, void *, 408 void (*fn)(struct scsi_device *, void *)); 409 extern void __starget_for_each_device(struct scsi_target *, void *, 410 void (*fn)(struct scsi_device *, 411 void *)); 412 413 /* only exposed to implement shost_for_each_device */ 414 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 415 struct scsi_device *); 416 417 /** 418 * shost_for_each_device - iterate over all devices of a host 419 * @sdev: the &struct scsi_device to use as a cursor 420 * @shost: the &struct scsi_host to iterate over 421 * 422 * Iterator that returns each device attached to @shost. This loop 423 * takes a reference on each device and releases it at the end. If 424 * you break out of the loop, you must call scsi_device_put(sdev). 425 */ 426 #define shost_for_each_device(sdev, shost) \ 427 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 428 (sdev); \ 429 (sdev) = __scsi_iterate_devices((shost), (sdev))) 430 431 /** 432 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 433 * @sdev: the &struct scsi_device to use as a cursor 434 * @shost: the &struct scsi_host to iterate over 435 * 436 * Iterator that returns each device attached to @shost. It does _not_ 437 * take a reference on the scsi_device, so the whole loop must be 438 * protected by shost->host_lock. 439 * 440 * Note: The only reason to use this is because you need to access the 441 * device list in interrupt context. Otherwise you really want to use 442 * shost_for_each_device instead. 443 */ 444 #define __shost_for_each_device(sdev, shost) \ 445 list_for_each_entry((sdev), &((shost)->__devices), siblings) 446 447 extern int scsi_change_queue_depth(struct scsi_device *, int); 448 extern int scsi_track_queue_full(struct scsi_device *, int); 449 450 extern int scsi_set_medium_removal(struct scsi_device *, char); 451 452 int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 453 int subpage, unsigned char *buffer, int len, int timeout, 454 int retries, struct scsi_mode_data *data, 455 struct scsi_sense_hdr *); 456 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 457 unsigned char *buffer, int len, int timeout, 458 int retries, struct scsi_mode_data *data, 459 struct scsi_sense_hdr *); 460 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 461 int retries, struct scsi_sense_hdr *sshdr); 462 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 463 int buf_len); 464 int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 465 unsigned int len, unsigned char opcode, 466 unsigned short sa); 467 extern int scsi_device_set_state(struct scsi_device *sdev, 468 enum scsi_device_state state); 469 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 470 gfp_t gfpflags); 471 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 472 extern void sdev_evt_send_simple(struct scsi_device *sdev, 473 enum scsi_device_event evt_type, gfp_t gfpflags); 474 extern int scsi_device_quiesce(struct scsi_device *sdev); 475 extern void scsi_device_resume(struct scsi_device *sdev); 476 extern void scsi_target_quiesce(struct scsi_target *); 477 extern void scsi_target_resume(struct scsi_target *); 478 extern void scsi_scan_target(struct device *parent, unsigned int channel, 479 unsigned int id, u64 lun, 480 enum scsi_scan_mode rescan); 481 extern void scsi_target_reap(struct scsi_target *); 482 void scsi_block_targets(struct Scsi_Host *shost, struct device *dev); 483 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 484 extern void scsi_remove_target(struct device *); 485 extern const char *scsi_device_state_name(enum scsi_device_state); 486 extern int scsi_is_sdev_device(const struct device *); 487 extern int scsi_is_target_device(const struct device *); 488 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 489 490 /* 491 * scsi_execute_cmd users can set scsi_failure.result to have 492 * scsi_check_passthrough fail/retry a command. scsi_failure.result can be a 493 * specific host byte or message code, or SCMD_FAILURE_RESULT_ANY can be used 494 * to match any host or message code. 495 */ 496 #define SCMD_FAILURE_RESULT_ANY 0x7fffffff 497 /* 498 * Set scsi_failure.result to SCMD_FAILURE_STAT_ANY to fail/retry any failure 499 * scsi_status_is_good returns false for. 500 */ 501 #define SCMD_FAILURE_STAT_ANY 0xff 502 /* 503 * The following can be set to the scsi_failure sense, asc and ascq fields to 504 * match on any sense, ASC, or ASCQ value. 505 */ 506 #define SCMD_FAILURE_SENSE_ANY 0xff 507 #define SCMD_FAILURE_ASC_ANY 0xff 508 #define SCMD_FAILURE_ASCQ_ANY 0xff 509 /* Always retry a matching failure. */ 510 #define SCMD_FAILURE_NO_LIMIT -1 511 512 struct scsi_failure { 513 int result; 514 u8 sense; 515 u8 asc; 516 u8 ascq; 517 /* 518 * Number of times scsi_execute_cmd will retry the failure. It does 519 * not count for the total_allowed. 520 */ 521 s8 allowed; 522 /* Number of times the failure has been retried. */ 523 s8 retries; 524 }; 525 526 struct scsi_failures { 527 /* 528 * If a scsi_failure does not have a retry limit setup this limit will 529 * be used. 530 */ 531 int total_allowed; 532 int total_retries; 533 struct scsi_failure *failure_definitions; 534 }; 535 536 /* Optional arguments to scsi_execute_cmd */ 537 struct scsi_exec_args { 538 unsigned char *sense; /* sense buffer */ 539 unsigned int sense_len; /* sense buffer len */ 540 struct scsi_sense_hdr *sshdr; /* decoded sense header */ 541 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */ 542 int scmd_flags; /* SCMD flags */ 543 int *resid; /* residual length */ 544 struct scsi_failures *failures; /* failures to retry */ 545 }; 546 547 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd, 548 blk_opf_t opf, void *buffer, unsigned int bufflen, 549 int timeout, int retries, 550 const struct scsi_exec_args *args); 551 void scsi_failures_reset_retries(struct scsi_failures *failures); 552 553 extern void sdev_disable_disk_events(struct scsi_device *sdev); 554 extern void sdev_enable_disk_events(struct scsi_device *sdev); 555 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 556 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 557 558 #ifdef CONFIG_PM 559 extern int scsi_autopm_get_device(struct scsi_device *); 560 extern void scsi_autopm_put_device(struct scsi_device *); 561 #else scsi_autopm_get_device(struct scsi_device * d)562 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } scsi_autopm_put_device(struct scsi_device * d)563 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 564 #endif /* CONFIG_PM */ 565 scsi_device_reprobe(struct scsi_device * sdev)566 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 567 { 568 return device_reprobe(&sdev->sdev_gendev); 569 } 570 sdev_channel(struct scsi_device * sdev)571 static inline unsigned int sdev_channel(struct scsi_device *sdev) 572 { 573 return sdev->channel; 574 } 575 sdev_id(struct scsi_device * sdev)576 static inline unsigned int sdev_id(struct scsi_device *sdev) 577 { 578 return sdev->id; 579 } 580 581 #define scmd_id(scmd) sdev_id((scmd)->device) 582 #define scmd_channel(scmd) sdev_channel((scmd)->device) 583 584 /* 585 * checks for positions of the SCSI state machine 586 */ scsi_device_online(struct scsi_device * sdev)587 static inline int scsi_device_online(struct scsi_device *sdev) 588 { 589 return (sdev->sdev_state != SDEV_OFFLINE && 590 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 591 sdev->sdev_state != SDEV_DEL); 592 } scsi_device_blocked(struct scsi_device * sdev)593 static inline int scsi_device_blocked(struct scsi_device *sdev) 594 { 595 return sdev->sdev_state == SDEV_BLOCK || 596 sdev->sdev_state == SDEV_CREATED_BLOCK; 597 } scsi_device_created(struct scsi_device * sdev)598 static inline int scsi_device_created(struct scsi_device *sdev) 599 { 600 return sdev->sdev_state == SDEV_CREATED || 601 sdev->sdev_state == SDEV_CREATED_BLOCK; 602 } 603 604 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 605 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 606 enum scsi_device_state new_state); 607 608 /* accessor functions for the SCSI parameters */ scsi_device_sync(struct scsi_device * sdev)609 static inline int scsi_device_sync(struct scsi_device *sdev) 610 { 611 return sdev->sdtr; 612 } scsi_device_wide(struct scsi_device * sdev)613 static inline int scsi_device_wide(struct scsi_device *sdev) 614 { 615 return sdev->wdtr; 616 } scsi_device_dt(struct scsi_device * sdev)617 static inline int scsi_device_dt(struct scsi_device *sdev) 618 { 619 return sdev->ppr; 620 } scsi_device_dt_only(struct scsi_device * sdev)621 static inline int scsi_device_dt_only(struct scsi_device *sdev) 622 { 623 if (sdev->inquiry_len < 57) 624 return 0; 625 return (sdev->inquiry[56] & 0x0c) == 0x04; 626 } scsi_device_ius(struct scsi_device * sdev)627 static inline int scsi_device_ius(struct scsi_device *sdev) 628 { 629 if (sdev->inquiry_len < 57) 630 return 0; 631 return sdev->inquiry[56] & 0x01; 632 } scsi_device_qas(struct scsi_device * sdev)633 static inline int scsi_device_qas(struct scsi_device *sdev) 634 { 635 if (sdev->inquiry_len < 57) 636 return 0; 637 return sdev->inquiry[56] & 0x02; 638 } scsi_device_enclosure(struct scsi_device * sdev)639 static inline int scsi_device_enclosure(struct scsi_device *sdev) 640 { 641 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 642 } 643 scsi_device_protection(struct scsi_device * sdev)644 static inline int scsi_device_protection(struct scsi_device *sdev) 645 { 646 if (sdev->no_dif) 647 return 0; 648 649 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 650 } 651 scsi_device_tpgs(struct scsi_device * sdev)652 static inline int scsi_device_tpgs(struct scsi_device *sdev) 653 { 654 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 655 } 656 657 /** 658 * scsi_device_supports_vpd - test if a device supports VPD pages 659 * @sdev: the &struct scsi_device to test 660 * 661 * If the 'try_vpd_pages' flag is set it takes precedence. 662 * Otherwise we will assume VPD pages are supported if the 663 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 664 */ scsi_device_supports_vpd(struct scsi_device * sdev)665 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 666 { 667 /* Attempt VPD inquiry if the device blacklist explicitly calls 668 * for it. 669 */ 670 if (sdev->try_vpd_pages) 671 return 1; 672 /* 673 * Although VPD inquiries can go to SCSI-2 type devices, 674 * some USB ones crash on receiving them, and the pages 675 * we currently ask for are mandatory for SPC-2 and beyond 676 */ 677 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 678 return 1; 679 return 0; 680 } 681 scsi_device_busy(struct scsi_device * sdev)682 static inline int scsi_device_busy(struct scsi_device *sdev) 683 { 684 return sbitmap_weight(&sdev->budget_map); 685 } 686 687 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 688 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 689 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 690 691 #endif /* _SCSI_SCSI_DEVICE_H */ 692