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 retry_hwerror:1; /* Retry HARDWARE_ERROR */ 126 127 unsigned int device_blocked; /* Device returned QUEUE_FULL. */ 128 129 unsigned int max_device_blocked; /* what device_blocked counts down from */ 130 #define SCSI_DEFAULT_DEVICE_BLOCKED 3 131 132 atomic_t iorequest_cnt; 133 atomic_t iodone_cnt; 134 atomic_t ioerr_cnt; 135 136 int timeout; 137 138 struct device sdev_gendev; 139 struct class_device sdev_classdev; 140 141 struct execute_work ew; /* used to get process context on put */ 142 143 enum scsi_device_state sdev_state; 144 unsigned long sdev_data[0]; 145 } __attribute__((aligned(sizeof(unsigned long)))); 146 #define to_scsi_device(d) \ 147 container_of(d, struct scsi_device, sdev_gendev) 148 #define class_to_sdev(d) \ 149 container_of(d, struct scsi_device, sdev_classdev) 150 #define transport_class_to_sdev(class_dev) \ 151 to_scsi_device(class_dev->dev) 152 153 #define sdev_printk(prefix, sdev, fmt, a...) \ 154 dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a) 155 156 #define scmd_printk(prefix, scmd, fmt, a...) \ 157 dev_printk(prefix, &(scmd)->device->sdev_gendev, fmt, ##a) 158 159 enum scsi_target_state { 160 STARGET_RUNNING = 1, 161 STARGET_DEL, 162 }; 163 164 /* 165 * scsi_target: representation of a scsi target, for now, this is only 166 * used for single_lun devices. If no one has active IO to the target, 167 * starget_sdev_user is NULL, else it points to the active sdev. 168 */ 169 struct scsi_target { 170 struct scsi_device *starget_sdev_user; 171 struct list_head siblings; 172 struct list_head devices; 173 struct device dev; 174 unsigned int reap_ref; /* protected by the host lock */ 175 unsigned int channel; 176 unsigned int id; /* target id ... replace 177 * scsi_device.id eventually */ 178 unsigned int create:1; /* signal that it needs to be added */ 179 unsigned int pdt_1f_for_no_lun; /* PDT = 0x1f */ 180 /* means no lun present */ 181 182 char scsi_level; 183 struct execute_work ew; 184 enum scsi_target_state state; 185 void *hostdata; /* available to low-level driver */ 186 unsigned long starget_data[0]; /* for the transport */ 187 /* starget_data must be the last element!!!! */ 188 } __attribute__((aligned(sizeof(unsigned long)))); 189 190 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 191 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 192 { 193 return to_scsi_target(sdev->sdev_gendev.parent); 194 } 195 #define transport_class_to_starget(class_dev) \ 196 to_scsi_target(class_dev->dev) 197 198 #define starget_printk(prefix, starget, fmt, a...) \ 199 dev_printk(prefix, &(starget)->dev, fmt, ##a) 200 201 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 202 uint, uint, uint, void *hostdata); 203 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 204 uint target, uint lun); 205 extern void scsi_remove_device(struct scsi_device *); 206 extern int scsi_device_cancel(struct scsi_device *, int); 207 208 extern int scsi_device_get(struct scsi_device *); 209 extern void scsi_device_put(struct scsi_device *); 210 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 211 uint, uint, uint); 212 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 213 uint, uint, uint); 214 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 215 uint); 216 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 217 uint); 218 extern void starget_for_each_device(struct scsi_target *, void *, 219 void (*fn)(struct scsi_device *, void *)); 220 221 /* only exposed to implement shost_for_each_device */ 222 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 223 struct scsi_device *); 224 225 /** 226 * shost_for_each_device - iterate over all devices of a host 227 * @sdev: iterator 228 * @host: host whiches devices we want to iterate over 229 * 230 * This traverses over each devices of @shost. The devices have 231 * a reference that must be released by scsi_host_put when breaking 232 * out of the loop. 233 */ 234 #define shost_for_each_device(sdev, shost) \ 235 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 236 (sdev); \ 237 (sdev) = __scsi_iterate_devices((shost), (sdev))) 238 239 /** 240 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 241 * @sdev: iterator 242 * @host: host whiches devices we want to iterate over 243 * 244 * This traverses over each devices of @shost. It does _not_ take a 245 * reference on the scsi_device, thus it the whole loop must be protected 246 * by shost->host_lock. 247 * 248 * Note: The only reason why drivers would want to use this is because 249 * they're need to access the device list in irq context. Otherwise you 250 * really want to use shost_for_each_device instead. 251 */ 252 #define __shost_for_each_device(sdev, shost) \ 253 list_for_each_entry((sdev), &((shost)->__devices), siblings) 254 255 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int); 256 extern int scsi_track_queue_full(struct scsi_device *, int); 257 258 extern int scsi_set_medium_removal(struct scsi_device *, char); 259 260 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 261 unsigned char *buffer, int len, int timeout, 262 int retries, struct scsi_mode_data *data, 263 struct scsi_sense_hdr *); 264 extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp, 265 int modepage, unsigned char *buffer, int len, 266 int timeout, int retries, 267 struct scsi_mode_data *data, 268 struct scsi_sense_hdr *); 269 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 270 int retries); 271 extern int scsi_device_set_state(struct scsi_device *sdev, 272 enum scsi_device_state state); 273 extern int scsi_device_quiesce(struct scsi_device *sdev); 274 extern void scsi_device_resume(struct scsi_device *sdev); 275 extern void scsi_target_quiesce(struct scsi_target *); 276 extern void scsi_target_resume(struct scsi_target *); 277 extern void scsi_scan_target(struct device *parent, unsigned int channel, 278 unsigned int id, unsigned int lun, int rescan); 279 extern void scsi_target_reap(struct scsi_target *); 280 extern void scsi_target_block(struct device *); 281 extern void scsi_target_unblock(struct device *); 282 extern void scsi_remove_target(struct device *); 283 extern void int_to_scsilun(unsigned int, struct scsi_lun *); 284 extern const char *scsi_device_state_name(enum scsi_device_state); 285 extern int scsi_is_sdev_device(const struct device *); 286 extern int scsi_is_target_device(const struct device *); 287 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 288 int data_direction, void *buffer, unsigned bufflen, 289 unsigned char *sense, int timeout, int retries, 290 int flag); 291 extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd, 292 int data_direction, void *buffer, unsigned bufflen, 293 struct scsi_sense_hdr *, int timeout, int retries); 294 extern int scsi_execute_async(struct scsi_device *sdev, 295 const unsigned char *cmd, int cmd_len, int data_direction, 296 void *buffer, unsigned bufflen, int use_sg, 297 int timeout, int retries, void *privdata, 298 void (*done)(void *, char *, int, int), 299 gfp_t gfp); 300 301 static inline void scsi_device_reprobe(struct scsi_device *sdev) 302 { 303 device_reprobe(&sdev->sdev_gendev); 304 } 305 306 static inline unsigned int sdev_channel(struct scsi_device *sdev) 307 { 308 return sdev->channel; 309 } 310 311 static inline unsigned int sdev_id(struct scsi_device *sdev) 312 { 313 return sdev->id; 314 } 315 316 #define scmd_id(scmd) sdev_id((scmd)->device) 317 #define scmd_channel(scmd) sdev_channel((scmd)->device) 318 319 static inline int scsi_device_online(struct scsi_device *sdev) 320 { 321 return sdev->sdev_state != SDEV_OFFLINE; 322 } 323 324 /* accessor functions for the SCSI parameters */ 325 static inline int scsi_device_sync(struct scsi_device *sdev) 326 { 327 return sdev->sdtr; 328 } 329 static inline int scsi_device_wide(struct scsi_device *sdev) 330 { 331 return sdev->wdtr; 332 } 333 static inline int scsi_device_dt(struct scsi_device *sdev) 334 { 335 return sdev->ppr; 336 } 337 static inline int scsi_device_dt_only(struct scsi_device *sdev) 338 { 339 if (sdev->inquiry_len < 57) 340 return 0; 341 return (sdev->inquiry[56] & 0x0c) == 0x04; 342 } 343 static inline int scsi_device_ius(struct scsi_device *sdev) 344 { 345 if (sdev->inquiry_len < 57) 346 return 0; 347 return sdev->inquiry[56] & 0x01; 348 } 349 static inline int scsi_device_qas(struct scsi_device *sdev) 350 { 351 if (sdev->inquiry_len < 57) 352 return 0; 353 return sdev->inquiry[56] & 0x02; 354 } 355 #endif /* _SCSI_SCSI_DEVICE_H */ 356