1 #ifndef _SCSI_SCSI_DEVICE_H 2 #define _SCSI_SCSI_DEVICE_H 3 4 #include <linux/device.h> 5 #include <linux/list.h> 6 #include <linux/spinlock.h> 7 #include <linux/workqueue.h> 8 #include <linux/blkdev.h> 9 #include <asm/atomic.h> 10 11 struct request_queue; 12 struct scsi_cmnd; 13 struct scsi_lun; 14 struct scsi_sense_hdr; 15 16 struct scsi_mode_data { 17 __u32 length; 18 __u16 block_descriptor_length; 19 __u8 medium_type; 20 __u8 device_specific; 21 __u8 header_length; 22 __u8 longlba:1; 23 }; 24 25 /* 26 * sdev state: If you alter this, you also need to alter scsi_sysfs.c 27 * (for the ascii descriptions) and the state model enforcer: 28 * scsi_lib:scsi_device_set_state(). 29 */ 30 enum scsi_device_state { 31 SDEV_CREATED = 1, /* device created but not added to sysfs 32 * Only internal commands allowed (for inq) */ 33 SDEV_RUNNING, /* device properly configured 34 * All commands allowed */ 35 SDEV_CANCEL, /* beginning to delete device 36 * Only error handler commands allowed */ 37 SDEV_DEL, /* device deleted 38 * no commands allowed */ 39 SDEV_QUIESCE, /* Device quiescent. No block commands 40 * will be accepted, only specials (which 41 * originate in the mid-layer) */ 42 SDEV_OFFLINE, /* Device offlined (by error handling or 43 * user request */ 44 SDEV_BLOCK, /* Device blocked by scsi lld. No scsi 45 * commands from user or midlayer should be issued 46 * to the scsi lld. */ 47 }; 48 49 enum scsi_device_event { 50 SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ 51 52 SDEV_EVT_LAST = SDEV_EVT_MEDIA_CHANGE, 53 SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1 54 }; 55 56 struct scsi_event { 57 enum scsi_device_event evt_type; 58 struct list_head node; 59 60 /* put union of data structures, for non-simple event types, 61 * here 62 */ 63 }; 64 65 struct scsi_device { 66 struct Scsi_Host *host; 67 struct request_queue *request_queue; 68 69 /* the next two are protected by the host->host_lock */ 70 struct list_head siblings; /* list of all devices on this host */ 71 struct list_head same_target_siblings; /* just the devices sharing same target id */ 72 73 /* this is now protected by the request_queue->queue_lock */ 74 unsigned int device_busy; /* commands actually active on 75 * low-level. protected by queue_lock. */ 76 spinlock_t list_lock; 77 struct list_head cmd_list; /* queue of in use SCSI Command structures */ 78 struct list_head starved_entry; 79 struct scsi_cmnd *current_cmnd; /* currently active command */ 80 unsigned short queue_depth; /* How deep of a queue we want */ 81 unsigned short last_queue_full_depth; /* These two are used by */ 82 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 83 unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same 84 jiffie count on our counter, they 85 could all be from the same event. */ 86 87 unsigned int id, lun, channel; 88 89 unsigned int manufacturer; /* Manufacturer of device, for using 90 * vendor-specific cmd's */ 91 unsigned sector_size; /* size in bytes */ 92 93 void *hostdata; /* available to low-level driver */ 94 char type; 95 char scsi_level; 96 char inq_periph_qual; /* PQ from INQUIRY data */ 97 unsigned char inquiry_len; /* valid bytes in 'inquiry' */ 98 unsigned char * inquiry; /* INQUIRY response data */ 99 const char * vendor; /* [back_compat] point into 'inquiry' ... */ 100 const char * model; /* ... after scan; point to static string */ 101 const char * rev; /* ... "nullnullnullnull" before scan */ 102 unsigned char current_tag; /* current tag */ 103 struct scsi_target *sdev_target; /* used only for single_lun */ 104 105 unsigned int sdev_bflags; /* black/white flags as also found in 106 * scsi_devinfo.[hc]. For now used only to 107 * pass settings from slave_alloc to scsi 108 * core. */ 109 unsigned writeable:1; 110 unsigned removable:1; 111 unsigned changed:1; /* Data invalid due to media change */ 112 unsigned busy:1; /* Used to prevent races */ 113 unsigned lockable:1; /* Able to prevent media removal */ 114 unsigned locked:1; /* Media removal disabled */ 115 unsigned borken:1; /* Tell the Seagate driver to be 116 * painfully slow on this device */ 117 unsigned disconnect:1; /* can disconnect */ 118 unsigned soft_reset:1; /* Uses soft reset option */ 119 unsigned sdtr:1; /* Device supports SDTR messages */ 120 unsigned wdtr:1; /* Device supports WDTR messages */ 121 unsigned ppr:1; /* Device supports PPR messages */ 122 unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */ 123 unsigned simple_tags:1; /* simple queue tag messages are enabled */ 124 unsigned ordered_tags:1;/* ordered queue tag messages are enabled */ 125 unsigned single_lun:1; /* Indicates we should only allow I/O to 126 * one of the luns for the device at a 127 * time. */ 128 unsigned was_reset:1; /* There was a bus reset on the bus for 129 * this device */ 130 unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN 131 * because we did a bus reset. */ 132 unsigned use_10_for_rw:1; /* first try 10-byte read / write */ 133 unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */ 134 unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */ 135 unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */ 136 unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */ 137 unsigned no_start_on_add:1; /* do not issue start on add */ 138 unsigned allow_restart:1; /* issue START_UNIT in error handler */ 139 unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */ 140 unsigned no_uld_attach:1; /* disable connecting to upper level drivers */ 141 unsigned select_no_atn:1; 142 unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */ 143 unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */ 144 unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */ 145 146 DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ 147 struct list_head event_list; /* asserted events */ 148 struct work_struct event_work; 149 150 unsigned int device_blocked; /* Device returned QUEUE_FULL. */ 151 152 unsigned int max_device_blocked; /* what device_blocked counts down from */ 153 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 154 155 atomic_t iorequest_cnt; 156 atomic_t iodone_cnt; 157 atomic_t ioerr_cnt; 158 159 int timeout; 160 161 struct device sdev_gendev; 162 struct class_device sdev_classdev; 163 164 struct execute_work ew; /* used to get process context on put */ 165 166 enum scsi_device_state sdev_state; 167 unsigned long sdev_data[0]; 168 } __attribute__((aligned(sizeof(unsigned long)))); 169 #define to_scsi_device(d) \ 170 container_of(d, struct scsi_device, sdev_gendev) 171 #define class_to_sdev(d) \ 172 container_of(d, struct scsi_device, sdev_classdev) 173 #define transport_class_to_sdev(class_dev) \ 174 to_scsi_device(class_dev->dev) 175 176 #define sdev_printk(prefix, sdev, fmt, a...) \ 177 dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a) 178 179 #define scmd_printk(prefix, scmd, fmt, a...) \ 180 (scmd)->request->rq_disk ? \ 181 sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \ 182 (scmd)->request->rq_disk->disk_name, ##a) : \ 183 sdev_printk(prefix, (scmd)->device, fmt, ##a) 184 185 enum scsi_target_state { 186 STARGET_RUNNING = 1, 187 STARGET_DEL, 188 }; 189 190 /* 191 * scsi_target: representation of a scsi target, for now, this is only 192 * used for single_lun devices. If no one has active IO to the target, 193 * starget_sdev_user is NULL, else it points to the active sdev. 194 */ 195 struct scsi_target { 196 struct scsi_device *starget_sdev_user; 197 struct list_head siblings; 198 struct list_head devices; 199 struct device dev; 200 unsigned int reap_ref; /* protected by the host lock */ 201 unsigned int channel; 202 unsigned int id; /* target id ... replace 203 * scsi_device.id eventually */ 204 unsigned int create:1; /* signal that it needs to be added */ 205 unsigned int pdt_1f_for_no_lun; /* PDT = 0x1f */ 206 /* means no lun present */ 207 208 char scsi_level; 209 struct execute_work ew; 210 enum scsi_target_state state; 211 void *hostdata; /* available to low-level driver */ 212 unsigned long starget_data[0]; /* for the transport */ 213 /* starget_data must be the last element!!!! */ 214 } __attribute__((aligned(sizeof(unsigned long)))); 215 216 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 217 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 218 { 219 return to_scsi_target(sdev->sdev_gendev.parent); 220 } 221 #define transport_class_to_starget(class_dev) \ 222 to_scsi_target(class_dev->dev) 223 224 #define starget_printk(prefix, starget, fmt, a...) \ 225 dev_printk(prefix, &(starget)->dev, fmt, ##a) 226 227 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 228 uint, uint, uint, void *hostdata); 229 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 230 uint target, uint lun); 231 extern void scsi_remove_device(struct scsi_device *); 232 233 extern int scsi_device_get(struct scsi_device *); 234 extern void scsi_device_put(struct scsi_device *); 235 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 236 uint, uint, uint); 237 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 238 uint, uint, uint); 239 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 240 uint); 241 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 242 uint); 243 extern void starget_for_each_device(struct scsi_target *, void *, 244 void (*fn)(struct scsi_device *, void *)); 245 246 /* only exposed to implement shost_for_each_device */ 247 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 248 struct scsi_device *); 249 250 /** 251 * shost_for_each_device - iterate over all devices of a host 252 * @sdev: the &struct scsi_device to use as a cursor 253 * @shost: the &struct scsi_host to iterate over 254 * 255 * Iterator that returns each device attached to @shost. This loop 256 * takes a reference on each device and releases it at the end. If 257 * you break out of the loop, you must call scsi_device_put(sdev). 258 */ 259 #define shost_for_each_device(sdev, shost) \ 260 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 261 (sdev); \ 262 (sdev) = __scsi_iterate_devices((shost), (sdev))) 263 264 /** 265 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 266 * @sdev: the &struct scsi_device to use as a cursor 267 * @shost: the &struct scsi_host to iterate over 268 * 269 * Iterator that returns each device attached to @shost. It does _not_ 270 * take a reference on the scsi_device, so the whole loop must be 271 * protected by shost->host_lock. 272 * 273 * Note: The only reason to use this is because you need to access the 274 * device list in interrupt context. Otherwise you really want to use 275 * shost_for_each_device instead. 276 */ 277 #define __shost_for_each_device(sdev, shost) \ 278 list_for_each_entry((sdev), &((shost)->__devices), siblings) 279 280 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int); 281 extern int scsi_track_queue_full(struct scsi_device *, int); 282 283 extern int scsi_set_medium_removal(struct scsi_device *, char); 284 285 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 286 unsigned char *buffer, int len, int timeout, 287 int retries, struct scsi_mode_data *data, 288 struct scsi_sense_hdr *); 289 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 290 int modepage, unsigned char *buffer, int len, 291 int timeout, int retries, 292 struct scsi_mode_data *data, 293 struct scsi_sense_hdr *); 294 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 295 int retries); 296 extern int scsi_device_set_state(struct scsi_device *sdev, 297 enum scsi_device_state state); 298 extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type, 299 gfp_t gfpflags); 300 extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt); 301 extern void sdev_evt_send_simple(struct scsi_device *sdev, 302 enum scsi_device_event evt_type, gfp_t gfpflags); 303 extern int scsi_device_quiesce(struct scsi_device *sdev); 304 extern void scsi_device_resume(struct scsi_device *sdev); 305 extern void scsi_target_quiesce(struct scsi_target *); 306 extern void scsi_target_resume(struct scsi_target *); 307 extern void scsi_scan_target(struct device *parent, unsigned int channel, 308 unsigned int id, unsigned int lun, int rescan); 309 extern void scsi_target_reap(struct scsi_target *); 310 extern void scsi_target_block(struct device *); 311 extern void scsi_target_unblock(struct device *); 312 extern void scsi_remove_target(struct device *); 313 extern void int_to_scsilun(unsigned int, struct scsi_lun *); 314 extern int scsilun_to_int(struct scsi_lun *); 315 extern const char *scsi_device_state_name(enum scsi_device_state); 316 extern int scsi_is_sdev_device(const struct device *); 317 extern int scsi_is_target_device(const struct device *); 318 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 319 int data_direction, void *buffer, unsigned bufflen, 320 unsigned char *sense, int timeout, int retries, 321 int flag); 322 extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd, 323 int data_direction, void *buffer, unsigned bufflen, 324 struct scsi_sense_hdr *, int timeout, int retries); 325 extern int scsi_execute_async(struct scsi_device *sdev, 326 const unsigned char *cmd, int cmd_len, int data_direction, 327 void *buffer, unsigned bufflen, int use_sg, 328 int timeout, int retries, void *privdata, 329 void (*done)(void *, char *, int, int), 330 gfp_t gfp); 331 332 static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev) 333 { 334 return device_reprobe(&sdev->sdev_gendev); 335 } 336 337 static inline unsigned int sdev_channel(struct scsi_device *sdev) 338 { 339 return sdev->channel; 340 } 341 342 static inline unsigned int sdev_id(struct scsi_device *sdev) 343 { 344 return sdev->id; 345 } 346 347 #define scmd_id(scmd) sdev_id((scmd)->device) 348 #define scmd_channel(scmd) sdev_channel((scmd)->device) 349 350 static inline int scsi_device_online(struct scsi_device *sdev) 351 { 352 return sdev->sdev_state != SDEV_OFFLINE; 353 } 354 355 /* accessor functions for the SCSI parameters */ 356 static inline int scsi_device_sync(struct scsi_device *sdev) 357 { 358 return sdev->sdtr; 359 } 360 static inline int scsi_device_wide(struct scsi_device *sdev) 361 { 362 return sdev->wdtr; 363 } 364 static inline int scsi_device_dt(struct scsi_device *sdev) 365 { 366 return sdev->ppr; 367 } 368 static inline int scsi_device_dt_only(struct scsi_device *sdev) 369 { 370 if (sdev->inquiry_len < 57) 371 return 0; 372 return (sdev->inquiry[56] & 0x0c) == 0x04; 373 } 374 static inline int scsi_device_ius(struct scsi_device *sdev) 375 { 376 if (sdev->inquiry_len < 57) 377 return 0; 378 return sdev->inquiry[56] & 0x01; 379 } 380 static inline int scsi_device_qas(struct scsi_device *sdev) 381 { 382 if (sdev->inquiry_len < 57) 383 return 0; 384 return sdev->inquiry[56] & 0x02; 385 } 386 387 #define MODULE_ALIAS_SCSI_DEVICE(type) \ 388 MODULE_ALIAS("scsi:t-" __stringify(type) "*") 389 #define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x" 390 391 #endif /* _SCSI_SCSI_DEVICE_H */ 392