Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _SCSI_SCSI_HOST_H |
| 2 | #define _SCSI_SCSI_HOST_H |
| 3 | |
| 4 | #include <linux/device.h> |
| 5 | #include <linux/list.h> |
| 6 | #include <linux/types.h> |
| 7 | #include <linux/workqueue.h> |
| 8 | |
| 9 | struct block_device; |
| 10 | struct module; |
| 11 | struct scsi_cmnd; |
| 12 | struct scsi_device; |
James Bottomley | a283bd3 | 2005-05-24 12:06:38 -0500 | [diff] [blame] | 13 | struct scsi_target; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | struct Scsi_Host; |
| 15 | struct scsi_host_cmd_pool; |
| 16 | struct scsi_transport_template; |
| 17 | |
| 18 | |
| 19 | /* |
| 20 | * The various choices mean: |
| 21 | * NONE: Self evident. Host adapter is not capable of scatter-gather. |
| 22 | * ALL: Means that the host adapter module can do scatter-gather, |
| 23 | * and that there is no limit to the size of the table to which |
| 24 | * we scatter/gather data. |
| 25 | * Anything else: Indicates the maximum number of chains that can be |
| 26 | * used in one scatter-gather request. |
| 27 | */ |
| 28 | #define SG_NONE 0 |
| 29 | #define SG_ALL 0xff |
| 30 | |
| 31 | |
| 32 | #define DISABLE_CLUSTERING 0 |
| 33 | #define ENABLE_CLUSTERING 1 |
| 34 | |
| 35 | enum scsi_eh_timer_return { |
| 36 | EH_NOT_HANDLED, |
| 37 | EH_HANDLED, |
| 38 | EH_RESET_TIMER, |
| 39 | }; |
| 40 | |
| 41 | |
| 42 | struct scsi_host_template { |
| 43 | struct module *module; |
| 44 | const char *name; |
| 45 | |
| 46 | /* |
| 47 | * Used to initialize old-style drivers. For new-style drivers |
| 48 | * just perform all work in your module initialization function. |
| 49 | * |
| 50 | * Status: OBSOLETE |
| 51 | */ |
| 52 | int (* detect)(struct scsi_host_template *); |
| 53 | |
| 54 | /* |
| 55 | * Used as unload callback for hosts with old-style drivers. |
| 56 | * |
| 57 | * Status: OBSOLETE |
| 58 | */ |
| 59 | int (* release)(struct Scsi_Host *); |
| 60 | |
| 61 | /* |
| 62 | * The info function will return whatever useful information the |
| 63 | * developer sees fit. If not provided, then the name field will |
| 64 | * be used instead. |
| 65 | * |
| 66 | * Status: OPTIONAL |
| 67 | */ |
| 68 | const char *(* info)(struct Scsi_Host *); |
| 69 | |
| 70 | /* |
| 71 | * Ioctl interface |
| 72 | * |
| 73 | * Status: OPTIONAL |
| 74 | */ |
| 75 | int (* ioctl)(struct scsi_device *dev, int cmd, void __user *arg); |
| 76 | |
| 77 | |
| 78 | #ifdef CONFIG_COMPAT |
| 79 | /* |
| 80 | * Compat handler. Handle 32bit ABI. |
| 81 | * When unknown ioctl is passed return -ENOIOCTLCMD. |
| 82 | * |
| 83 | * Status: OPTIONAL |
| 84 | */ |
| 85 | int (* compat_ioctl)(struct scsi_device *dev, int cmd, void __user *arg); |
| 86 | #endif |
| 87 | |
| 88 | /* |
| 89 | * The queuecommand function is used to queue up a scsi |
| 90 | * command block to the LLDD. When the driver finished |
| 91 | * processing the command the done callback is invoked. |
| 92 | * |
| 93 | * If queuecommand returns 0, then the HBA has accepted the |
| 94 | * command. The done() function must be called on the command |
| 95 | * when the driver has finished with it. (you may call done on the |
| 96 | * command before queuecommand returns, but in this case you |
| 97 | * *must* return 0 from queuecommand). |
| 98 | * |
| 99 | * Queuecommand may also reject the command, in which case it may |
| 100 | * not touch the command and must not call done() for it. |
| 101 | * |
| 102 | * There are two possible rejection returns: |
| 103 | * |
| 104 | * SCSI_MLQUEUE_DEVICE_BUSY: Block this device temporarily, but |
| 105 | * allow commands to other devices serviced by this host. |
| 106 | * |
| 107 | * SCSI_MLQUEUE_HOST_BUSY: Block all devices served by this |
| 108 | * host temporarily. |
| 109 | * |
| 110 | * For compatibility, any other non-zero return is treated the |
| 111 | * same as SCSI_MLQUEUE_HOST_BUSY. |
| 112 | * |
| 113 | * NOTE: "temporarily" means either until the next command for# |
| 114 | * this device/host completes, or a period of time determined by |
| 115 | * I/O pressure in the system if there are no other outstanding |
| 116 | * commands. |
| 117 | * |
| 118 | * STATUS: REQUIRED |
| 119 | */ |
| 120 | int (* queuecommand)(struct scsi_cmnd *, |
| 121 | void (*done)(struct scsi_cmnd *)); |
| 122 | |
| 123 | /* |
| 124 | * This is an error handling strategy routine. You don't need to |
| 125 | * define one of these if you don't want to - there is a default |
| 126 | * routine that is present that should work in most cases. For those |
| 127 | * driver authors that have the inclination and ability to write their |
| 128 | * own strategy routine, this is where it is specified. Note - the |
| 129 | * strategy routine is *ALWAYS* run in the context of the kernel eh |
| 130 | * thread. Thus you are guaranteed to *NOT* be in an interrupt |
| 131 | * handler when you execute this, and you are also guaranteed to |
| 132 | * *NOT* have any other commands being queued while you are in the |
| 133 | * strategy routine. When you return from this function, operations |
| 134 | * return to normal. |
| 135 | * |
| 136 | * See scsi_error.c scsi_unjam_host for additional comments about |
| 137 | * what this function should and should not be attempting to do. |
| 138 | * |
| 139 | * Status: REQUIRED (at least one of them) |
| 140 | */ |
| 141 | int (* eh_strategy_handler)(struct Scsi_Host *); |
| 142 | int (* eh_abort_handler)(struct scsi_cmnd *); |
| 143 | int (* eh_device_reset_handler)(struct scsi_cmnd *); |
| 144 | int (* eh_bus_reset_handler)(struct scsi_cmnd *); |
| 145 | int (* eh_host_reset_handler)(struct scsi_cmnd *); |
| 146 | |
| 147 | /* |
| 148 | * This is an optional routine to notify the host that the scsi |
| 149 | * timer just fired. The returns tell the timer routine what to |
| 150 | * do about this: |
| 151 | * |
| 152 | * EH_HANDLED: I fixed the error, please complete the command |
| 153 | * EH_RESET_TIMER: I need more time, reset the timer and |
| 154 | * begin counting again |
| 155 | * EH_NOT_HANDLED Begin normal error recovery |
| 156 | * |
| 157 | * Status: OPTIONAL |
| 158 | */ |
| 159 | enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *); |
| 160 | |
| 161 | /* |
| 162 | * Before the mid layer attempts to scan for a new device where none |
| 163 | * currently exists, it will call this entry in your driver. Should |
| 164 | * your driver need to allocate any structs or perform any other init |
| 165 | * items in order to send commands to a currently unused target/lun |
| 166 | * combo, then this is where you can perform those allocations. This |
| 167 | * is specifically so that drivers won't have to perform any kind of |
| 168 | * "is this a new device" checks in their queuecommand routine, |
| 169 | * thereby making the hot path a bit quicker. |
| 170 | * |
| 171 | * Return values: 0 on success, non-0 on failure |
| 172 | * |
| 173 | * Deallocation: If we didn't find any devices at this ID, you will |
| 174 | * get an immediate call to slave_destroy(). If we find something |
| 175 | * here then you will get a call to slave_configure(), then the |
| 176 | * device will be used for however long it is kept around, then when |
| 177 | * the device is removed from the system (or * possibly at reboot |
| 178 | * time), you will then get a call to slave_destroy(). This is |
| 179 | * assuming you implement slave_configure and slave_destroy. |
| 180 | * However, if you allocate memory and hang it off the device struct, |
| 181 | * then you must implement the slave_destroy() routine at a minimum |
| 182 | * in order to avoid leaking memory |
| 183 | * each time a device is tore down. |
| 184 | * |
| 185 | * Status: OPTIONAL |
| 186 | */ |
| 187 | int (* slave_alloc)(struct scsi_device *); |
| 188 | |
| 189 | /* |
| 190 | * Once the device has responded to an INQUIRY and we know the |
| 191 | * device is online, we call into the low level driver with the |
| 192 | * struct scsi_device *. If the low level device driver implements |
| 193 | * this function, it *must* perform the task of setting the queue |
| 194 | * depth on the device. All other tasks are optional and depend |
| 195 | * on what the driver supports and various implementation details. |
| 196 | * |
| 197 | * Things currently recommended to be handled at this time include: |
| 198 | * |
| 199 | * 1. Setting the device queue depth. Proper setting of this is |
| 200 | * described in the comments for scsi_adjust_queue_depth. |
| 201 | * 2. Determining if the device supports the various synchronous |
| 202 | * negotiation protocols. The device struct will already have |
| 203 | * responded to INQUIRY and the results of the standard items |
| 204 | * will have been shoved into the various device flag bits, eg. |
| 205 | * device->sdtr will be true if the device supports SDTR messages. |
| 206 | * 3. Allocating command structs that the device will need. |
| 207 | * 4. Setting the default timeout on this device (if needed). |
| 208 | * 5. Anything else the low level driver might want to do on a device |
| 209 | * specific setup basis... |
| 210 | * 6. Return 0 on success, non-0 on error. The device will be marked |
| 211 | * as offline on error so that no access will occur. If you return |
| 212 | * non-0, your slave_destroy routine will never get called for this |
| 213 | * device, so don't leave any loose memory hanging around, clean |
| 214 | * up after yourself before returning non-0 |
| 215 | * |
| 216 | * Status: OPTIONAL |
| 217 | */ |
| 218 | int (* slave_configure)(struct scsi_device *); |
| 219 | |
| 220 | /* |
| 221 | * Immediately prior to deallocating the device and after all activity |
| 222 | * has ceased the mid layer calls this point so that the low level |
| 223 | * driver may completely detach itself from the scsi device and vice |
| 224 | * versa. The low level driver is responsible for freeing any memory |
| 225 | * it allocated in the slave_alloc or slave_configure calls. |
| 226 | * |
| 227 | * Status: OPTIONAL |
| 228 | */ |
| 229 | void (* slave_destroy)(struct scsi_device *); |
| 230 | |
| 231 | /* |
James Bottomley | a283bd3 | 2005-05-24 12:06:38 -0500 | [diff] [blame] | 232 | * Before the mid layer attempts to scan for a new device attached |
| 233 | * to a target where no target currently exists, it will call this |
| 234 | * entry in your driver. Should your driver need to allocate any |
| 235 | * structs or perform any other init items in order to send commands |
| 236 | * to a currently unused target, then this is where you can perform |
| 237 | * those allocations. |
| 238 | * |
| 239 | * Return values: 0 on success, non-0 on failure |
| 240 | * |
| 241 | * Status: OPTIONAL |
| 242 | */ |
| 243 | int (* target_alloc)(struct scsi_target *); |
| 244 | |
| 245 | /* |
| 246 | * Immediately prior to deallocating the target structure, and |
| 247 | * after all activity to attached scsi devices has ceased, the |
| 248 | * midlayer calls this point so that the driver may deallocate |
| 249 | * and terminate any references to the target. |
| 250 | * |
| 251 | * Status: OPTIONAL |
| 252 | */ |
| 253 | void (* target_destroy)(struct scsi_target *); |
| 254 | |
| 255 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | * fill in this function to allow the queue depth of this host |
| 257 | * to be changeable (on a per device basis). returns either |
| 258 | * the current queue depth setting (may be different from what |
| 259 | * was passed in) or an error. An error should only be |
| 260 | * returned if the requested depth is legal but the driver was |
| 261 | * unable to set it. If the requested depth is illegal, the |
| 262 | * driver should set and return the closest legal queue depth. |
| 263 | * |
| 264 | */ |
| 265 | int (* change_queue_depth)(struct scsi_device *, int); |
| 266 | |
| 267 | /* |
| 268 | * fill in this function to allow the changing of tag types |
| 269 | * (this also allows the enabling/disabling of tag command |
| 270 | * queueing). An error should only be returned if something |
| 271 | * went wrong in the driver while trying to set the tag type. |
| 272 | * If the driver doesn't support the requested tag type, then |
| 273 | * it should set the closest type it does support without |
| 274 | * returning an error. Returns the actual tag type set. |
| 275 | */ |
| 276 | int (* change_queue_type)(struct scsi_device *, int); |
| 277 | |
| 278 | /* |
| 279 | * This function determines the bios parameters for a given |
| 280 | * harddisk. These tend to be numbers that are made up by |
| 281 | * the host adapter. Parameters: |
| 282 | * size, device, list (heads, sectors, cylinders) |
| 283 | * |
| 284 | * Status: OPTIONAL */ |
| 285 | int (* bios_param)(struct scsi_device *, struct block_device *, |
| 286 | sector_t, int []); |
| 287 | |
| 288 | /* |
| 289 | * Can be used to export driver statistics and other infos to the |
| 290 | * world outside the kernel ie. userspace and it also provides an |
| 291 | * interface to feed the driver with information. |
| 292 | * |
| 293 | * Status: OBSOLETE |
| 294 | */ |
| 295 | int (*proc_info)(struct Scsi_Host *, char *, char **, off_t, int, int); |
| 296 | |
| 297 | /* |
| 298 | * Name of proc directory |
| 299 | */ |
| 300 | char *proc_name; |
| 301 | |
| 302 | /* |
| 303 | * Used to store the procfs directory if a driver implements the |
| 304 | * proc_info method. |
| 305 | */ |
| 306 | struct proc_dir_entry *proc_dir; |
| 307 | |
| 308 | /* |
| 309 | * This determines if we will use a non-interrupt driven |
| 310 | * or an interrupt driven scheme, It is set to the maximum number |
| 311 | * of simultaneous commands a given host adapter will accept. |
| 312 | */ |
| 313 | int can_queue; |
| 314 | |
| 315 | /* |
| 316 | * In many instances, especially where disconnect / reconnect are |
| 317 | * supported, our host also has an ID on the SCSI bus. If this is |
| 318 | * the case, then it must be reserved. Please set this_id to -1 if |
| 319 | * your setup is in single initiator mode, and the host lacks an |
| 320 | * ID. |
| 321 | */ |
| 322 | int this_id; |
| 323 | |
| 324 | /* |
| 325 | * This determines the degree to which the host adapter is capable |
| 326 | * of scatter-gather. |
| 327 | */ |
| 328 | unsigned short sg_tablesize; |
| 329 | |
| 330 | /* |
| 331 | * If the host adapter has limitations beside segment count |
| 332 | */ |
| 333 | unsigned short max_sectors; |
| 334 | |
| 335 | /* |
| 336 | * dma scatter gather segment boundary limit. a segment crossing this |
| 337 | * boundary will be split in two. |
| 338 | */ |
| 339 | unsigned long dma_boundary; |
| 340 | |
| 341 | /* |
| 342 | * This specifies "machine infinity" for host templates which don't |
| 343 | * limit the transfer size. Note this limit represents an absolute |
| 344 | * maximum, and may be over the transfer limits allowed for |
| 345 | * individual devices (e.g. 256 for SCSI-1) |
| 346 | */ |
| 347 | #define SCSI_DEFAULT_MAX_SECTORS 1024 |
| 348 | |
| 349 | /* |
| 350 | * True if this host adapter can make good use of linked commands. |
| 351 | * This will allow more than one command to be queued to a given |
| 352 | * unit on a given host. Set this to the maximum number of command |
| 353 | * blocks to be provided for each device. Set this to 1 for one |
| 354 | * command block per lun, 2 for two, etc. Do not set this to 0. |
| 355 | * You should make sure that the host adapter will do the right thing |
| 356 | * before you try setting this above 1. |
| 357 | */ |
| 358 | short cmd_per_lun; |
| 359 | |
| 360 | /* |
| 361 | * present contains counter indicating how many boards of this |
| 362 | * type were found when we did the scan. |
| 363 | */ |
| 364 | unsigned char present; |
| 365 | |
| 366 | /* |
| 367 | * true if this host adapter uses unchecked DMA onto an ISA bus. |
| 368 | */ |
| 369 | unsigned unchecked_isa_dma:1; |
| 370 | |
| 371 | /* |
| 372 | * true if this host adapter can make good use of clustering. |
| 373 | * I originally thought that if the tablesize was large that it |
| 374 | * was a waste of CPU cycles to prepare a cluster list, but |
| 375 | * it works out that the Buslogic is faster if you use a smaller |
| 376 | * number of segments (i.e. use clustering). I guess it is |
| 377 | * inefficient. |
| 378 | */ |
| 379 | unsigned use_clustering:1; |
| 380 | |
| 381 | /* |
| 382 | * True for emulated SCSI host adapters (e.g. ATAPI) |
| 383 | */ |
| 384 | unsigned emulated:1; |
| 385 | |
| 386 | /* |
| 387 | * True if the low-level driver performs its own reset-settle delays. |
| 388 | */ |
| 389 | unsigned skip_settle_delay:1; |
| 390 | |
| 391 | /* |
| 392 | * ordered write support |
| 393 | */ |
| 394 | unsigned ordered_flush:1; |
| 395 | unsigned ordered_tag:1; |
| 396 | |
| 397 | /* |
| 398 | * Countdown for host blocking with no commands outstanding |
| 399 | */ |
| 400 | unsigned int max_host_blocked; |
| 401 | |
| 402 | /* |
| 403 | * Default value for the blocking. If the queue is empty, |
| 404 | * host_blocked counts down in the request_fn until it restarts |
| 405 | * host operations as zero is reached. |
| 406 | * |
| 407 | * FIXME: This should probably be a value in the template |
| 408 | */ |
| 409 | #define SCSI_DEFAULT_HOST_BLOCKED 7 |
| 410 | |
| 411 | /* |
| 412 | * Pointer to the sysfs class properties for this host, NULL terminated. |
| 413 | */ |
| 414 | struct class_device_attribute **shost_attrs; |
| 415 | |
| 416 | /* |
| 417 | * Pointer to the SCSI device properties for this host, NULL terminated. |
| 418 | */ |
| 419 | struct device_attribute **sdev_attrs; |
| 420 | |
| 421 | /* |
| 422 | * List of hosts per template. |
| 423 | * |
| 424 | * This is only for use by scsi_module.c for legacy templates. |
| 425 | * For these access to it is synchronized implicitly by |
| 426 | * module_init/module_exit. |
| 427 | */ |
| 428 | struct list_head legacy_hosts; |
| 429 | }; |
| 430 | |
| 431 | /* |
| 432 | * shost states |
| 433 | */ |
| 434 | enum { |
| 435 | SHOST_ADD, |
| 436 | SHOST_DEL, |
| 437 | SHOST_CANCEL, |
| 438 | SHOST_RECOVERY, |
| 439 | }; |
| 440 | |
| 441 | struct Scsi_Host { |
| 442 | /* |
| 443 | * __devices is protected by the host_lock, but you should |
| 444 | * usually use scsi_device_lookup / shost_for_each_device |
| 445 | * to access it and don't care about locking yourself. |
| 446 | * In the rare case of beeing in irq context you can use |
| 447 | * their __ prefixed variants with the lock held. NEVER |
| 448 | * access this list directly from a driver. |
| 449 | */ |
| 450 | struct list_head __devices; |
| 451 | struct list_head __targets; |
| 452 | |
| 453 | struct scsi_host_cmd_pool *cmd_pool; |
| 454 | spinlock_t free_list_lock; |
| 455 | struct list_head free_list; /* backup store of cmd structs */ |
| 456 | struct list_head starved_list; |
| 457 | |
| 458 | spinlock_t default_lock; |
| 459 | spinlock_t *host_lock; |
| 460 | |
| 461 | struct semaphore scan_mutex;/* serialize scanning activity */ |
| 462 | |
| 463 | struct list_head eh_cmd_q; |
| 464 | struct task_struct * ehandler; /* Error recovery thread. */ |
| 465 | struct semaphore * eh_wait; /* The error recovery thread waits |
| 466 | on this. */ |
| 467 | struct completion * eh_notify; /* wait for eh to begin or end */ |
| 468 | struct semaphore * eh_action; /* Wait for specific actions on the |
| 469 | host. */ |
| 470 | unsigned int eh_active:1; /* Indicates the eh thread is awake and active if |
| 471 | this is true. */ |
| 472 | unsigned int eh_kill:1; /* set when killing the eh thread */ |
| 473 | wait_queue_head_t host_wait; |
| 474 | struct scsi_host_template *hostt; |
| 475 | struct scsi_transport_template *transportt; |
| 06f81ea | 2005-04-17 14:57:29 -0500 | [diff] [blame] | 476 | |
| 477 | /* |
| 478 | * The following two fields are protected with host_lock; |
| 479 | * however, eh routines can safely access during eh processing |
| 480 | * without acquiring the lock. |
| 481 | */ |
| 482 | unsigned int host_busy; /* commands actually active on low-level */ |
| 483 | unsigned int host_failed; /* commands that failed. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
| 485 | unsigned short host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */ |
| 486 | int resetting; /* if set, it means that last_reset is a valid value */ |
| 487 | unsigned long last_reset; |
| 488 | |
| 489 | /* |
| 490 | * These three parameters can be used to allow for wide scsi, |
| 491 | * and for host adapters that support multiple busses |
| 492 | * The first two should be set to 1 more than the actual max id |
| 493 | * or lun (i.e. 8 for normal systems). |
| 494 | */ |
| 495 | unsigned int max_id; |
| 496 | unsigned int max_lun; |
| 497 | unsigned int max_channel; |
| 498 | |
| 499 | /* |
| 500 | * This is a unique identifier that must be assigned so that we |
| 501 | * have some way of identifying each detected host adapter properly |
| 502 | * and uniquely. For hosts that do not support more than one card |
| 503 | * in the system at one time, this does not need to be set. It is |
| 504 | * initialized to 0 in scsi_register. |
| 505 | */ |
| 506 | unsigned int unique_id; |
| 507 | |
| 508 | /* |
| 509 | * The maximum length of SCSI commands that this host can accept. |
| 510 | * Probably 12 for most host adapters, but could be 16 for others. |
| 511 | * For drivers that don't set this field, a value of 12 is |
| 512 | * assumed. I am leaving this as a number rather than a bit |
| 513 | * because you never know what subsequent SCSI standards might do |
| 514 | * (i.e. could there be a 20 byte or a 24-byte command a few years |
| 515 | * down the road?). |
| 516 | */ |
| 517 | unsigned char max_cmd_len; |
| 518 | |
| 519 | int this_id; |
| 520 | int can_queue; |
| 521 | short cmd_per_lun; |
| 522 | short unsigned int sg_tablesize; |
| 523 | short unsigned int max_sectors; |
| 524 | unsigned long dma_boundary; |
| 525 | /* |
| 526 | * Used to assign serial numbers to the cmds. |
| 527 | * Protected by the host lock. |
| 528 | */ |
| 529 | unsigned long cmd_serial_number, cmd_pid; |
| 530 | |
| 531 | unsigned unchecked_isa_dma:1; |
| 532 | unsigned use_clustering:1; |
| 533 | unsigned use_blk_tcq:1; |
| 534 | |
| 535 | /* |
| 536 | * Host has requested that no further requests come through for the |
| 537 | * time being. |
| 538 | */ |
| 539 | unsigned host_self_blocked:1; |
| 540 | |
| 541 | /* |
| 542 | * Host uses correct SCSI ordering not PC ordering. The bit is |
| 543 | * set for the minority of drivers whose authors actually read |
| 544 | * the spec ;) |
| 545 | */ |
| 546 | unsigned reverse_ordering:1; |
| 547 | |
| 548 | /* |
| 549 | * ordered write support |
| 550 | */ |
| 551 | unsigned ordered_flush:1; |
| 552 | unsigned ordered_tag:1; |
| 553 | |
| 554 | /* |
| 555 | * Optional work queue to be utilized by the transport |
| 556 | */ |
| 557 | char work_q_name[KOBJ_NAME_LEN]; |
| 558 | struct workqueue_struct *work_q; |
| 559 | |
| 560 | /* |
| 561 | * Host has rejected a command because it was busy. |
| 562 | */ |
| 563 | unsigned int host_blocked; |
| 564 | |
| 565 | /* |
| 566 | * Value host_blocked counts down from |
| 567 | */ |
| 568 | unsigned int max_host_blocked; |
| 569 | |
| 570 | /* legacy crap */ |
| 571 | unsigned long base; |
| 572 | unsigned long io_port; |
| 573 | unsigned char n_io_port; |
| 574 | unsigned char dma_channel; |
| 575 | unsigned int irq; |
| 576 | |
| 577 | |
| 578 | unsigned long shost_state; |
| 579 | |
| 580 | /* ldm bits */ |
| 581 | struct device shost_gendev; |
| 582 | struct class_device shost_classdev; |
| 583 | |
| 584 | /* |
| 585 | * List of hosts per template. |
| 586 | * |
| 587 | * This is only for use by scsi_module.c for legacy templates. |
| 588 | * For these access to it is synchronized implicitly by |
| 589 | * module_init/module_exit. |
| 590 | */ |
| 591 | struct list_head sht_legacy_list; |
| 592 | |
| 593 | /* |
| 594 | * Points to the transport data (if any) which is allocated |
| 595 | * separately |
| 596 | */ |
| 597 | void *shost_data; |
| 598 | |
| 599 | /* |
| 600 | * We should ensure that this is aligned, both for better performance |
| 601 | * and also because some compilers (m68k) don't automatically force |
| 602 | * alignment to a long boundary. |
| 603 | */ |
| 604 | unsigned long hostdata[0] /* Used for storage of host specific stuff */ |
| 605 | __attribute__ ((aligned (sizeof(unsigned long)))); |
| 606 | }; |
| 607 | |
| 608 | #define class_to_shost(d) \ |
| 609 | container_of(d, struct Scsi_Host, shost_classdev) |
| 610 | |
| 611 | int scsi_is_host_device(const struct device *); |
| 612 | |
| 613 | static inline struct Scsi_Host *dev_to_shost(struct device *dev) |
| 614 | { |
| 615 | while (!scsi_is_host_device(dev)) { |
| 616 | if (!dev->parent) |
| 617 | return NULL; |
| 618 | dev = dev->parent; |
| 619 | } |
| 620 | return container_of(dev, struct Scsi_Host, shost_gendev); |
| 621 | } |
| 622 | |
| 623 | extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *); |
| 624 | extern void scsi_flush_work(struct Scsi_Host *); |
| 625 | |
| 626 | extern struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *, int); |
| 627 | extern int __must_check scsi_add_host(struct Scsi_Host *, struct device *); |
| 628 | extern void scsi_scan_host(struct Scsi_Host *); |
| 629 | extern void scsi_scan_single_target(struct Scsi_Host *, unsigned int, |
| 630 | unsigned int); |
| 631 | extern void scsi_rescan_device(struct device *); |
| 632 | extern void scsi_remove_host(struct Scsi_Host *); |
| 633 | extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *); |
| 634 | extern void scsi_host_put(struct Scsi_Host *t); |
| 635 | extern struct Scsi_Host *scsi_host_lookup(unsigned short); |
| 636 | |
| 637 | extern u64 scsi_calculate_bounce_limit(struct Scsi_Host *); |
| 638 | |
| 639 | static inline void scsi_assign_lock(struct Scsi_Host *shost, spinlock_t *lock) |
| 640 | { |
| 641 | shost->host_lock = lock; |
| 642 | } |
| 643 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | static inline struct device *scsi_get_device(struct Scsi_Host *shost) |
| 645 | { |
| 646 | return shost->shost_gendev.parent; |
| 647 | } |
| 648 | |
| 649 | extern void scsi_unblock_requests(struct Scsi_Host *); |
| 650 | extern void scsi_block_requests(struct Scsi_Host *); |
| 651 | |
| 652 | struct class_container; |
| 653 | /* |
| 654 | * These two functions are used to allocate and free a pseudo device |
| 655 | * which will connect to the host adapter itself rather than any |
| 656 | * physical device. You must deallocate when you are done with the |
| 657 | * thing. This physical pseudo-device isn't real and won't be available |
| 658 | * from any high-level drivers. |
| 659 | */ |
| 660 | extern void scsi_free_host_dev(struct scsi_device *); |
| 661 | extern struct scsi_device *scsi_get_host_dev(struct Scsi_Host *); |
| 662 | |
| 663 | /* legacy interfaces */ |
| 664 | extern struct Scsi_Host *scsi_register(struct scsi_host_template *, int); |
| 665 | extern void scsi_unregister(struct Scsi_Host *); |
| 666 | |
| 667 | #endif /* _SCSI_SCSI_HOST_H */ |