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 enum scsi_vpd_parameters { 104 SCSI_VPD_HEADER_SIZE = 4, 105 }; 106 107 struct scsi_device { 108 struct Scsi_Host *host; 109 struct request_queue *request_queue; 110 111 /* the next two are protected by the host->host_lock */ 112 struct list_head siblings; /* list of all devices on this host */ 113 struct list_head same_target_siblings; /* just the devices sharing same target id */ 114 115 struct sbitmap budget_map; 116 atomic_t device_blocked; /* Device returned QUEUE_FULL. */ 117 118 atomic_t restarts; 119 spinlock_t list_lock; 120 struct list_head starved_entry; 121 unsigned short queue_depth; /* How deep of a queue we want */ 122 unsigned short max_queue_depth; /* max queue depth */ 123 unsigned short last_queue_full_depth; /* These two are used by */ 124 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 125 unsigned long last_queue_full_time; /* last queue full time */ 126 unsigned long queue_ramp_up_period; /* ramp up period in jiffies */ 127 #define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ) 128 129 unsigned long last_queue_ramp_up; /* last queue ramp up time */ 130 131 unsigned int id, channel; 132 u64 lun; 133 unsigned int manufacturer; /* Manufacturer of device, for using 134 * vendor-specific cmd's */ 135 unsigned sector_size; /* size in bytes */ 136 137 void *hostdata; /* available to low-level driver */ 138 unsigned char type; 139 char scsi_level; 140 char inq_periph_qual; /* PQ from INQUIRY data */ 141 struct mutex inquiry_mutex; 142 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 143 unsigned char * inquiry; /* INQUIRY response data */ 144 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 145 const char * model; /* ... after scan; point to static string */ 146 const char * rev; /* ... "nullnullnullnull" before scan */ 147 148 struct scsi_vpd __rcu *vpd_pg0; 149 struct scsi_vpd __rcu *vpd_pg83; 150 struct scsi_vpd __rcu *vpd_pg80; 151 struct scsi_vpd __rcu *vpd_pg89; 152 struct scsi_vpd __rcu *vpd_pgb0; 153 struct scsi_vpd __rcu *vpd_pgb1; 154 struct scsi_vpd __rcu *vpd_pgb2; 155 156 struct scsi_target *sdev_target; 157 158 blist_flags_t sdev_bflags; /* black/white flags as also found in 159 * scsi_devinfo.[hc]. For now used only to 160 * pass settings from slave_alloc to scsi 161 * core. */ 162 unsigned int eh_timeout; /* Error handling timeout */ 163 unsigned removable:1; 164 unsigned changed:1; /* Data invalid due to media change */ 165 unsigned busy:1; /* Used to prevent races */ 166 unsigned lockable:1; /* Able to prevent media removal */ 167 unsigned locked:1; /* Media removal disabled */ 168 unsigned borken:1; /* Tell the Seagate driver to be 169 * painfully slow on this device */ 170 unsigned disconnect:1; /* can disconnect */ 171 unsigned soft_reset:1; /* Uses soft reset option */ 172 unsigned sdtr:1; /* Device supports SDTR messages */ 173 unsigned wdtr:1; /* Device supports WDTR messages */ 174 unsigned ppr:1; /* Device supports PPR messages */ 175 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 176 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 177 unsigned was_reset:1; /* There was a bus reset on the bus for 178 * this device */ 179 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 180 * because we did a bus reset. */ 181 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 182 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 183 unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */ 184 unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */ 185 unsigned no_write_same:1; /* no WRITE SAME command */ 186 unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */ 187 unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */ 188 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 189 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 190 unsigned skip_vpd_pages:1; /* do not read VPD pages */ 191 unsigned try_vpd_pages:1; /* attempt to read VPD pages */ 192 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 193 unsigned no_start_on_add:1; /* do not issue start on add */ 194 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 195 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 196 unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */ 197 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 198 unsigned select_no_atn:1; 199 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 200 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 201 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 202 unsigned last_sector_bug:1; /* do not use multisector accesses on 203 SD_LAST_BUGGY_SECTORS */ 204 unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ 205 unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ 206 unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */ 207 unsigned security_supported:1; /* Supports Security Protocols */ 208 unsigned is_visible:1; /* is the device visible in sysfs */ 209 unsigned wce_default_on:1; /* Cache is ON by default */ 210 unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ 211 unsigned broken_fua:1; /* Don't set FUA bit */ 212 unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ 213 unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ 214 unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device 215 * creation time */ 216 unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */ 217 unsigned silence_suspend:1; /* Do not print runtime PM related messages */ 218 219 unsigned int queue_stopped; /* request queue is quiesced */ 220 bool offline_already; /* Device offline message logged */ 221 222 atomic_t disk_events_disable_depth; /* disable depth for disk events */ 223 224 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 225 DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */ 226 struct list_head event_list; /* asserted events */ 227 struct work_struct event_work; 228 229 unsigned int max_device_blocked; /* what device_blocked counts down from */ 230 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 231 232 atomic_t iorequest_cnt; 233 atomic_t iodone_cnt; 234 atomic_t ioerr_cnt; 235 atomic_t iotmo_cnt; 236 237 struct device sdev_gendev, 238 sdev_dev; 239 240 struct work_struct requeue_work; 241 242 struct scsi_device_handler *handler; 243 void *handler_data; 244 245 size_t dma_drain_len; 246 void *dma_drain_buf; 247 248 unsigned int sg_timeout; 249 unsigned int sg_reserved_size; 250 251 struct bsg_device *bsg_dev; 252 unsigned char access_state; 253 struct mutex state_mutex; 254 enum scsi_device_state sdev_state; 255 struct task_struct *quiesced_by; 256 unsigned long sdev_data[]; 257 } __attribute__((aligned(sizeof(unsigned long)))); 258 259 #define to_scsi_device(d) \ 260 container_of(d, struct scsi_device, sdev_gendev) 261 #define class_to_sdev(d) \ 262 container_of(d, struct scsi_device, sdev_dev) 263 #define transport_class_to_sdev(class_dev) \ 264 to_scsi_device(class_dev->parent) 265 266 #define sdev_dbg(sdev, fmt, a...) \ 267 dev_dbg(&(sdev)->sdev_gendev, fmt, ##a) 268 269 /* 270 * like scmd_printk, but the device name is passed in 271 * as a string pointer 272 */ 273 __printf(4, 5) void 274 sdev_prefix_printk(const char *, const struct scsi_device *, const char *, 275 const char *, ...); 276 277 #define sdev_printk(l, sdev, fmt, a...) \ 278 sdev_prefix_printk(l, sdev, NULL, fmt, ##a) 279 280 __printf(3, 4) void 281 scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...); 282 283 #define scmd_dbg(scmd, fmt, a...) \ 284 do { \ 285 struct request *__rq = scsi_cmd_to_rq((scmd)); \ 286 \ 287 if (__rq->q->disk) \ 288 sdev_dbg((scmd)->device, "[%s] " fmt, \ 289 __rq->q->disk->disk_name, ##a); \ 290 else \ 291 sdev_dbg((scmd)->device, fmt, ##a); \ 292 } while (0) 293 294 enum scsi_target_state { 295 STARGET_CREATED = 1, 296 STARGET_RUNNING, 297 STARGET_REMOVE, 298 STARGET_CREATED_REMOVE, 299 STARGET_DEL, 300 }; 301 302 /* 303 * scsi_target: representation of a scsi target, for now, this is only 304 * used for single_lun devices. If no one has active IO to the target, 305 * starget_sdev_user is NULL, else it points to the active sdev. 306 */ 307 struct scsi_target { 308 struct scsi_device *starget_sdev_user; 309 struct list_head siblings; 310 struct list_head devices; 311 struct device dev; 312 struct kref reap_ref; /* last put renders target invisible */ 313 unsigned int channel; 314 unsigned int id; /* target id ... replace 315 * scsi_device.id eventually */ 316 unsigned int create:1; /* signal that it needs to be added */ 317 unsigned int single_lun:1; /* Indicates we should only 318 * allow I/O to one of the luns 319 * for the device at a time. */ 320 unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f 321 * means no lun present. */ 322 unsigned int no_report_luns:1; /* Don't use 323 * REPORT LUNS for scanning. */ 324 unsigned int expecting_lun_change:1; /* A device has reported 325 * a 3F/0E UA, other devices on 326 * the same target will also. */ 327 /* commands actually active on LLD. */ 328 atomic_t target_busy; 329 atomic_t target_blocked; 330 331 /* 332 * LLDs should set this in the slave_alloc host template callout. 333 * If set to zero then there is not limit. 334 */ 335 unsigned int can_queue; 336 unsigned int max_target_blocked; 337 #define SCSI_DEFAULT_TARGET_BLOCKED 3 338 339 char scsi_level; 340 enum scsi_target_state state; 341 void *hostdata; /* available to low-level driver */ 342 unsigned long starget_data[]; /* for the transport */ 343 /* starget_data must be the last element!!!! */ 344 } __attribute__((aligned(sizeof(unsigned long)))); 345 346 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) scsi_target(struct scsi_device * sdev)347 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 348 { 349 return to_scsi_target(sdev->sdev_gendev.parent); 350 } 351 #define transport_class_to_starget(class_dev) \ 352 to_scsi_target(class_dev->parent) 353 354 #define starget_printk(prefix, starget, fmt, a...) \ 355 dev_printk(prefix, &(starget)->dev, fmt, ##a) 356 357 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 358 uint, uint, u64, void *hostdata); 359 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 360 uint target, u64 lun); 361 extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh); 362 extern void scsi_remove_device(struct scsi_device *); 363 extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh); 364 void scsi_attach_vpd(struct scsi_device *sdev); 365 366 extern struct scsi_device *scsi_device_from_queue(struct request_queue *q); 367 extern int __must_check scsi_device_get(struct scsi_device *); 368 extern void scsi_device_put(struct scsi_device *); 369 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 370 uint, uint, u64); 371 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 372 uint, uint, u64); 373 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 374 u64); 375 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 376 u64); 377 extern void starget_for_each_device(struct scsi_target *, void *, 378 void (*fn)(struct scsi_device *, void *)); 379 extern void __starget_for_each_device(struct scsi_target *, void *, 380 void (*fn)(struct scsi_device *, 381 void *)); 382 383 /* only exposed to implement shost_for_each_device */ 384 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 385 struct scsi_device *); 386 387 /** 388 * shost_for_each_device - iterate over all devices of a host 389 * @sdev: the &struct scsi_device to use as a cursor 390 * @shost: the &struct scsi_host to iterate over 391 * 392 * Iterator that returns each device attached to @shost. This loop 393 * takes a reference on each device and releases it at the end. If 394 * you break out of the loop, you must call scsi_device_put(sdev). 395 */ 396 #define shost_for_each_device(sdev, shost) \ 397 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 398 (sdev); \ 399 (sdev) = __scsi_iterate_devices((shost), (sdev))) 400 401 /** 402 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 403 * @sdev: the &struct scsi_device to use as a cursor 404 * @shost: the &struct scsi_host to iterate over 405 * 406 * Iterator that returns each device attached to @shost. It does _not_ 407 * take a reference on the scsi_device, so the whole loop must be 408 * protected by shost->host_lock. 409 * 410 * Note: The only reason to use this is because you need to access the 411 * device list in interrupt context. Otherwise you really want to use 412 * shost_for_each_device instead. 413 */ 414 #define __shost_for_each_device(sdev, shost) \ 415 list_for_each_entry((sdev), &((shost)->__devices), siblings) 416 417 extern int scsi_change_queue_depth(struct scsi_device *, int); 418 extern int scsi_track_queue_full(struct scsi_device *, int); 419 420 extern int scsi_set_medium_removal(struct scsi_device *, char); 421 422 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 423 unsigned char *buffer, int len, int timeout, 424 int retries, struct scsi_mode_data *data, 425 struct scsi_sense_hdr *); 426 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 427 unsigned char *buffer, int len, int timeout, 428 int retries, struct scsi_mode_data *data, 429 struct scsi_sense_hdr *); 430 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 431 int retries, struct scsi_sense_hdr *sshdr); 432 extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf, 433 int buf_len); 434 extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 435 unsigned int len, unsigned char opcode); 436 extern int scsi_device_set_state(struct scsi_device *sdev, 437 enum scsi_device_state state); 438 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 439 gfp_t gfpflags); 440 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 441 extern void sdev_evt_send_simple(struct scsi_device *sdev, 442 enum scsi_device_event evt_type, gfp_t gfpflags); 443 extern int scsi_device_quiesce(struct scsi_device *sdev); 444 extern void scsi_device_resume(struct scsi_device *sdev); 445 extern void scsi_target_quiesce(struct scsi_target *); 446 extern void scsi_target_resume(struct scsi_target *); 447 extern void scsi_scan_target(struct device *parent, unsigned int channel, 448 unsigned int id, u64 lun, 449 enum scsi_scan_mode rescan); 450 extern void scsi_target_reap(struct scsi_target *); 451 extern void scsi_target_block(struct device *); 452 extern void scsi_target_unblock(struct device *, enum scsi_device_state); 453 extern void scsi_remove_target(struct device *); 454 extern const char *scsi_device_state_name(enum scsi_device_state); 455 extern int scsi_is_sdev_device(const struct device *); 456 extern int scsi_is_target_device(const struct device *); 457 extern void scsi_sanitize_inquiry_string(unsigned char *s, int len); 458 459 /* Optional arguments to scsi_execute_cmd */ 460 struct scsi_exec_args { 461 unsigned char *sense; /* sense buffer */ 462 unsigned int sense_len; /* sense buffer len */ 463 struct scsi_sense_hdr *sshdr; /* decoded sense header */ 464 blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */ 465 int scmd_flags; /* SCMD flags */ 466 int *resid; /* residual length */ 467 }; 468 469 int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd, 470 blk_opf_t opf, void *buffer, unsigned int bufflen, 471 int timeout, int retries, 472 const struct scsi_exec_args *args); 473 474 extern void sdev_disable_disk_events(struct scsi_device *sdev); 475 extern void sdev_enable_disk_events(struct scsi_device *sdev); 476 extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t); 477 extern int scsi_vpd_tpg_id(struct scsi_device *, int *); 478 479 #ifdef CONFIG_PM 480 extern int scsi_autopm_get_device(struct scsi_device *); 481 extern void scsi_autopm_put_device(struct scsi_device *); 482 #else scsi_autopm_get_device(struct scsi_device * d)483 static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; } scsi_autopm_put_device(struct scsi_device * d)484 static inline void scsi_autopm_put_device(struct scsi_device *d) {} 485 #endif /* CONFIG_PM */ 486 scsi_device_reprobe(struct scsi_device * sdev)487 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 488 { 489 return device_reprobe(&sdev->sdev_gendev); 490 } 491 sdev_channel(struct scsi_device * sdev)492 static inline unsigned int sdev_channel(struct scsi_device *sdev) 493 { 494 return sdev->channel; 495 } 496 sdev_id(struct scsi_device * sdev)497 static inline unsigned int sdev_id(struct scsi_device *sdev) 498 { 499 return sdev->id; 500 } 501 502 #define scmd_id(scmd) sdev_id((scmd)->device) 503 #define scmd_channel(scmd) sdev_channel((scmd)->device) 504 505 /* 506 * checks for positions of the SCSI state machine 507 */ scsi_device_online(struct scsi_device * sdev)508 static inline int scsi_device_online(struct scsi_device *sdev) 509 { 510 return (sdev->sdev_state != SDEV_OFFLINE && 511 sdev->sdev_state != SDEV_TRANSPORT_OFFLINE && 512 sdev->sdev_state != SDEV_DEL); 513 } scsi_device_blocked(struct scsi_device * sdev)514 static inline int scsi_device_blocked(struct scsi_device *sdev) 515 { 516 return sdev->sdev_state == SDEV_BLOCK || 517 sdev->sdev_state == SDEV_CREATED_BLOCK; 518 } scsi_device_created(struct scsi_device * sdev)519 static inline int scsi_device_created(struct scsi_device *sdev) 520 { 521 return sdev->sdev_state == SDEV_CREATED || 522 sdev->sdev_state == SDEV_CREATED_BLOCK; 523 } 524 525 int scsi_internal_device_block_nowait(struct scsi_device *sdev); 526 int scsi_internal_device_unblock_nowait(struct scsi_device *sdev, 527 enum scsi_device_state new_state); 528 529 /* accessor functions for the SCSI parameters */ scsi_device_sync(struct scsi_device * sdev)530 static inline int scsi_device_sync(struct scsi_device *sdev) 531 { 532 return sdev->sdtr; 533 } scsi_device_wide(struct scsi_device * sdev)534 static inline int scsi_device_wide(struct scsi_device *sdev) 535 { 536 return sdev->wdtr; 537 } scsi_device_dt(struct scsi_device * sdev)538 static inline int scsi_device_dt(struct scsi_device *sdev) 539 { 540 return sdev->ppr; 541 } scsi_device_dt_only(struct scsi_device * sdev)542 static inline int scsi_device_dt_only(struct scsi_device *sdev) 543 { 544 if (sdev->inquiry_len < 57) 545 return 0; 546 return (sdev->inquiry[56] & 0x0c) == 0x04; 547 } scsi_device_ius(struct scsi_device * sdev)548 static inline int scsi_device_ius(struct scsi_device *sdev) 549 { 550 if (sdev->inquiry_len < 57) 551 return 0; 552 return sdev->inquiry[56] & 0x01; 553 } scsi_device_qas(struct scsi_device * sdev)554 static inline int scsi_device_qas(struct scsi_device *sdev) 555 { 556 if (sdev->inquiry_len < 57) 557 return 0; 558 return sdev->inquiry[56] & 0x02; 559 } scsi_device_enclosure(struct scsi_device * sdev)560 static inline int scsi_device_enclosure(struct scsi_device *sdev) 561 { 562 return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1; 563 } 564 scsi_device_protection(struct scsi_device * sdev)565 static inline int scsi_device_protection(struct scsi_device *sdev) 566 { 567 if (sdev->no_dif) 568 return 0; 569 570 return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0); 571 } 572 scsi_device_tpgs(struct scsi_device * sdev)573 static inline int scsi_device_tpgs(struct scsi_device *sdev) 574 { 575 return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0; 576 } 577 578 /** 579 * scsi_device_supports_vpd - test if a device supports VPD pages 580 * @sdev: the &struct scsi_device to test 581 * 582 * If the 'try_vpd_pages' flag is set it takes precedence. 583 * Otherwise we will assume VPD pages are supported if the 584 * SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set. 585 */ scsi_device_supports_vpd(struct scsi_device * sdev)586 static inline int scsi_device_supports_vpd(struct scsi_device *sdev) 587 { 588 /* Attempt VPD inquiry if the device blacklist explicitly calls 589 * for it. 590 */ 591 if (sdev->try_vpd_pages) 592 return 1; 593 /* 594 * Although VPD inquiries can go to SCSI-2 type devices, 595 * some USB ones crash on receiving them, and the pages 596 * we currently ask for are mandatory for SPC-2 and beyond 597 */ 598 if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages) 599 return 1; 600 return 0; 601 } 602 scsi_device_busy(struct scsi_device * sdev)603 static inline int scsi_device_busy(struct scsi_device *sdev) 604 { 605 return sbitmap_weight(&sdev->budget_map); 606 } 607 608 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 609 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 610 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 611 612 #endif /* _SCSI_SCSI_DEVICE_H */ 613