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