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 <asm/atomic.h> 8 9 struct request_queue; 10 struct scsi_cmnd; 11 struct scsi_lun; 12 struct scsi_sense_hdr; 13 14 struct scsi_mode_data { 15 __u32 length; 16 __u16 block_descriptor_length; 17 __u8 medium_type; 18 __u8 device_specific; 19 __u8 header_length; 20 __u8 longlba:1; 21 }; 22 23 /* 24 * sdev state: If you alter this, you also need to alter scsi_sysfs.c 25 * (for the ascii descriptions) and the state model enforcer: 26 * scsi_lib:scsi_device_set_state(). 27 */ 28 enum scsi_device_state { 29 SDEV_CREATED = 1, /* device created but not added to sysfs 30 * Only internal commands allowed (for inq) */ 31 SDEV_RUNNING, /* device properly configured 32 * All commands allowed */ 33 SDEV_CANCEL, /* beginning to delete device 34 * Only error handler commands allowed */ 35 SDEV_DEL, /* device deleted 36 * no commands allowed */ 37 SDEV_QUIESCE, /* Device quiescent. No block commands 38 * will be accepted, only specials (which 39 * originate in the mid-layer) */ 40 SDEV_OFFLINE, /* Device offlined (by error handling or 41 * user request */ 42 SDEV_BLOCK, /* Device blocked by scsi lld. No scsi 43 * commands from user or midlayer should be issued 44 * to the scsi lld. */ 45 }; 46 47 struct scsi_device { 48 struct Scsi_Host *host; 49 struct request_queue *request_queue; 50 51 /* the next two are protected by the host->host_lock */ 52 struct list_head siblings; /* list of all devices on this host */ 53 struct list_head same_target_siblings; /* just the devices sharing same target id */ 54 55 /* this is now protected by the request_queue->queue_lock */ 56 unsigned int device_busy; /* commands actually active on 57 * low-level. protected by queue_lock. */ 58 spinlock_t list_lock; 59 struct list_head cmd_list; /* queue of in use SCSI Command structures */ 60 struct list_head starved_entry; 61 struct scsi_cmnd *current_cmnd; /* currently active command */ 62 unsigned short queue_depth; /* How deep of a queue we want */ 63 unsigned short last_queue_full_depth; /* These two are used by */ 64 unsigned short last_queue_full_count; /* scsi_track_queue_full() */ 65 unsigned long last_queue_full_time;/* don't let QUEUE_FULLs on the same 66 jiffie count on our counter, they 67 could all be from the same event. */ 68 69 unsigned int id, lun, channel; 70 71 unsigned int manufacturer; /* Manufacturer of device, for using 72 * vendor-specific cmd's */ 73 unsigned sector_size; /* size in bytes */ 74 75 void *hostdata; /* available to low-level driver */ 76 char devfs_name[256]; /* devfs junk */ 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 char * vendor; /* [back_compat] point into 'inquiry' ... */ 83 char * model; /* ... after scan; point to static string */ 84 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 enum scsi_device_state sdev_state; 142 unsigned long sdev_data[0]; 143 } __attribute__((aligned(sizeof(unsigned long)))); 144 #define to_scsi_device(d) \ 145 container_of(d, struct scsi_device, sdev_gendev) 146 #define class_to_sdev(d) \ 147 container_of(d, struct scsi_device, sdev_classdev) 148 #define transport_class_to_sdev(class_dev) \ 149 to_scsi_device(class_dev->dev) 150 151 /* 152 * scsi_target: representation of a scsi target, for now, this is only 153 * used for single_lun devices. If no one has active IO to the target, 154 * starget_sdev_user is NULL, else it points to the active sdev. 155 */ 156 struct scsi_target { 157 struct scsi_device *starget_sdev_user; 158 struct list_head siblings; 159 struct list_head devices; 160 struct device dev; 161 unsigned int reap_ref; /* protected by the host lock */ 162 unsigned int channel; 163 unsigned int id; /* target id ... replace 164 * scsi_device.id eventually */ 165 unsigned long create:1; /* signal that it needs to be added */ 166 char scsi_level; 167 void *hostdata; /* available to low-level driver */ 168 unsigned long starget_data[0]; /* for the transport */ 169 /* starget_data must be the last element!!!! */ 170 } __attribute__((aligned(sizeof(unsigned long)))); 171 172 #define to_scsi_target(d) container_of(d, struct scsi_target, dev) 173 static inline struct scsi_target *scsi_target(struct scsi_device *sdev) 174 { 175 return to_scsi_target(sdev->sdev_gendev.parent); 176 } 177 #define transport_class_to_starget(class_dev) \ 178 to_scsi_target(class_dev->dev) 179 180 extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, 181 uint, uint, uint, void *hostdata); 182 extern int scsi_add_device(struct Scsi_Host *host, uint channel, 183 uint target, uint lun); 184 extern void scsi_remove_device(struct scsi_device *); 185 extern int scsi_device_cancel(struct scsi_device *, int); 186 187 extern int scsi_device_get(struct scsi_device *); 188 extern void scsi_device_put(struct scsi_device *); 189 extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *, 190 uint, uint, uint); 191 extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, 192 uint, uint, uint); 193 extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, 194 uint); 195 extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, 196 uint); 197 extern void starget_for_each_device(struct scsi_target *, void *, 198 void (*fn)(struct scsi_device *, void *)); 199 200 /* only exposed to implement shost_for_each_device */ 201 extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *, 202 struct scsi_device *); 203 204 /** 205 * shost_for_each_device - iterate over all devices of a host 206 * @sdev: iterator 207 * @host: host whiches devices we want to iterate over 208 * 209 * This traverses over each devices of @shost. The devices have 210 * a reference that must be released by scsi_host_put when breaking 211 * out of the loop. 212 */ 213 #define shost_for_each_device(sdev, shost) \ 214 for ((sdev) = __scsi_iterate_devices((shost), NULL); \ 215 (sdev); \ 216 (sdev) = __scsi_iterate_devices((shost), (sdev))) 217 218 /** 219 * __shost_for_each_device - iterate over all devices of a host (UNLOCKED) 220 * @sdev: iterator 221 * @host: host whiches devices we want to iterate over 222 * 223 * This traverses over each devices of @shost. It does _not_ take a 224 * reference on the scsi_device, thus it the whole loop must be protected 225 * by shost->host_lock. 226 * 227 * Note: The only reason why drivers would want to use this is because 228 * they're need to access the device list in irq context. Otherwise you 229 * really want to use shost_for_each_device instead. 230 */ 231 #define __shost_for_each_device(sdev, shost) \ 232 list_for_each_entry((sdev), &((shost)->__devices), siblings) 233 234 extern void scsi_adjust_queue_depth(struct scsi_device *, int, int); 235 extern int scsi_track_queue_full(struct scsi_device *, int); 236 237 extern int scsi_set_medium_removal(struct scsi_device *, char); 238 239 extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, 240 unsigned char *buffer, int len, int timeout, 241 int retries, struct scsi_mode_data *data, 242 struct scsi_sense_hdr *); 243 extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout, 244 int retries); 245 extern int scsi_device_set_state(struct scsi_device *sdev, 246 enum scsi_device_state state); 247 extern int scsi_device_quiesce(struct scsi_device *sdev); 248 extern void scsi_device_resume(struct scsi_device *sdev); 249 extern void scsi_target_quiesce(struct scsi_target *); 250 extern void scsi_target_resume(struct scsi_target *); 251 extern void scsi_scan_target(struct device *parent, unsigned int channel, 252 unsigned int id, unsigned int lun, int rescan); 253 extern void scsi_target_reap(struct scsi_target *); 254 extern void scsi_target_block(struct device *); 255 extern void scsi_target_unblock(struct device *); 256 extern void scsi_remove_target(struct device *); 257 extern void int_to_scsilun(unsigned int, struct scsi_lun *); 258 extern const char *scsi_device_state_name(enum scsi_device_state); 259 extern int scsi_is_sdev_device(const struct device *); 260 extern int scsi_is_target_device(const struct device *); 261 extern int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, 262 int data_direction, void *buffer, unsigned bufflen, 263 unsigned char *sense, int timeout, int retries, 264 int flag); 265 extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd, 266 int data_direction, void *buffer, unsigned bufflen, 267 struct scsi_sense_hdr *, int timeout, int retries); 268 269 static inline int scsi_device_online(struct scsi_device *sdev) 270 { 271 return sdev->sdev_state != SDEV_OFFLINE; 272 } 273 274 /* accessor functions for the SCSI parameters */ 275 static inline int scsi_device_sync(struct scsi_device *sdev) 276 { 277 return sdev->sdtr; 278 } 279 static inline int scsi_device_wide(struct scsi_device *sdev) 280 { 281 return sdev->wdtr; 282 } 283 static inline int scsi_device_dt(struct scsi_device *sdev) 284 { 285 return sdev->ppr; 286 } 287 static inline int scsi_device_dt_only(struct scsi_device *sdev) 288 { 289 if (sdev->inquiry_len < 57) 290 return 0; 291 return (sdev->inquiry[56] & 0x0c) == 0x04; 292 } 293 static inline int scsi_device_ius(struct scsi_device *sdev) 294 { 295 if (sdev->inquiry_len < 57) 296 return 0; 297 return sdev->inquiry[56] & 0x01; 298 } 299 static inline int scsi_device_qas(struct scsi_device *sdev) 300 { 301 if (sdev->inquiry_len < 57) 302 return 0; 303 return sdev->inquiry[56] & 0x02; 304 } 305 #endif /* _SCSI_SCSI_DEVICE_H */ 306