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