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