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1da177e4 LT |
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> | |
0b950672 | 8 | #include <linux/mutex.h> |
4660c8ed | 9 | #include <scsi/scsi.h> |
1da177e4 | 10 | |
b58d9154 | 11 | struct request_queue; |
1da177e4 | 12 | struct block_device; |
7dfdc9a5 | 13 | struct completion; |
1da177e4 LT |
14 | struct module; |
15 | struct scsi_cmnd; | |
16 | struct scsi_device; | |
a283bd37 | 17 | struct scsi_target; |
1da177e4 LT |
18 | struct Scsi_Host; |
19 | struct scsi_host_cmd_pool; | |
20 | struct scsi_transport_template; | |
86e33a29 | 21 | struct blk_queue_tags; |
1da177e4 LT |
22 | |
23 | ||
24 | /* | |
25 | * The various choices mean: | |
26 | * NONE: Self evident. Host adapter is not capable of scatter-gather. | |
27 | * ALL: Means that the host adapter module can do scatter-gather, | |
28 | * and that there is no limit to the size of the table to which | |
4660c8ed JB |
29 | * we scatter/gather data. The value we set here is the maximum |
30 | * single element sglist. To use chained sglists, the adapter | |
31 | * has to set a value beyond ALL (and correctly use the chain | |
32 | * handling API. | |
1da177e4 LT |
33 | * Anything else: Indicates the maximum number of chains that can be |
34 | * used in one scatter-gather request. | |
35 | */ | |
36 | #define SG_NONE 0 | |
4660c8ed | 37 | #define SG_ALL SCSI_MAX_SG_SEGMENTS |
1da177e4 | 38 | |
5dc2b89e FT |
39 | #define MODE_UNKNOWN 0x00 |
40 | #define MODE_INITIATOR 0x01 | |
41 | #define MODE_TARGET 0x02 | |
1da177e4 LT |
42 | |
43 | #define DISABLE_CLUSTERING 0 | |
44 | #define ENABLE_CLUSTERING 1 | |
45 | ||
e881a172 MC |
46 | enum { |
47 | SCSI_QDEPTH_DEFAULT, /* default requested change, e.g. from sysfs */ | |
48 | SCSI_QDEPTH_QFULL, /* scsi-ml requested due to queue full */ | |
49 | SCSI_QDEPTH_RAMP_UP, /* scsi-ml requested due to threshhold event */ | |
50 | }; | |
51 | ||
1da177e4 LT |
52 | struct scsi_host_template { |
53 | struct module *module; | |
54 | const char *name; | |
55 | ||
56 | /* | |
57 | * Used to initialize old-style drivers. For new-style drivers | |
58 | * just perform all work in your module initialization function. | |
59 | * | |
60 | * Status: OBSOLETE | |
61 | */ | |
62 | int (* detect)(struct scsi_host_template *); | |
63 | ||
64 | /* | |
65 | * Used as unload callback for hosts with old-style drivers. | |
66 | * | |
67 | * Status: OBSOLETE | |
68 | */ | |
69 | int (* release)(struct Scsi_Host *); | |
70 | ||
71 | /* | |
72 | * The info function will return whatever useful information the | |
73 | * developer sees fit. If not provided, then the name field will | |
74 | * be used instead. | |
75 | * | |
76 | * Status: OPTIONAL | |
77 | */ | |
78 | const char *(* info)(struct Scsi_Host *); | |
79 | ||
80 | /* | |
81 | * Ioctl interface | |
82 | * | |
83 | * Status: OPTIONAL | |
84 | */ | |
85 | int (* ioctl)(struct scsi_device *dev, int cmd, void __user *arg); | |
86 | ||
87 | ||
88 | #ifdef CONFIG_COMPAT | |
89 | /* | |
90 | * Compat handler. Handle 32bit ABI. | |
91 | * When unknown ioctl is passed return -ENOIOCTLCMD. | |
92 | * | |
93 | * Status: OPTIONAL | |
94 | */ | |
95 | int (* compat_ioctl)(struct scsi_device *dev, int cmd, void __user *arg); | |
96 | #endif | |
97 | ||
98 | /* | |
99 | * The queuecommand function is used to queue up a scsi | |
100 | * command block to the LLDD. When the driver finished | |
101 | * processing the command the done callback is invoked. | |
102 | * | |
103 | * If queuecommand returns 0, then the HBA has accepted the | |
104 | * command. The done() function must be called on the command | |
105 | * when the driver has finished with it. (you may call done on the | |
106 | * command before queuecommand returns, but in this case you | |
107 | * *must* return 0 from queuecommand). | |
108 | * | |
109 | * Queuecommand may also reject the command, in which case it may | |
110 | * not touch the command and must not call done() for it. | |
111 | * | |
112 | * There are two possible rejection returns: | |
113 | * | |
114 | * SCSI_MLQUEUE_DEVICE_BUSY: Block this device temporarily, but | |
115 | * allow commands to other devices serviced by this host. | |
116 | * | |
117 | * SCSI_MLQUEUE_HOST_BUSY: Block all devices served by this | |
118 | * host temporarily. | |
119 | * | |
120 | * For compatibility, any other non-zero return is treated the | |
121 | * same as SCSI_MLQUEUE_HOST_BUSY. | |
122 | * | |
123 | * NOTE: "temporarily" means either until the next command for# | |
124 | * this device/host completes, or a period of time determined by | |
125 | * I/O pressure in the system if there are no other outstanding | |
126 | * commands. | |
127 | * | |
128 | * STATUS: REQUIRED | |
129 | */ | |
130 | int (* queuecommand)(struct scsi_cmnd *, | |
131 | void (*done)(struct scsi_cmnd *)); | |
132 | ||
b58d9154 FT |
133 | /* |
134 | * The transfer functions are used to queue a scsi command to | |
135 | * the LLD. When the driver is finished processing the command | |
136 | * the done callback is invoked. | |
137 | * | |
bc7e380a | 138 | * This is called to inform the LLD to transfer |
30b0c37b | 139 | * scsi_bufflen(cmd) bytes. scsi_sg_count(cmd) speciefies the |
bc7e380a | 140 | * number of scatterlist entried in the command and |
30b0c37b | 141 | * scsi_sglist(cmd) returns the scatterlist. |
bc7e380a | 142 | * |
b58d9154 FT |
143 | * return values: see queuecommand |
144 | * | |
145 | * If the LLD accepts the cmd, it should set the result to an | |
146 | * appropriate value when completed before calling the done function. | |
147 | * | |
148 | * STATUS: REQUIRED FOR TARGET DRIVERS | |
149 | */ | |
150 | /* TODO: rename */ | |
151 | int (* transfer_response)(struct scsi_cmnd *, | |
152 | void (*done)(struct scsi_cmnd *)); | |
b58d9154 | 153 | |
1da177e4 LT |
154 | /* |
155 | * This is an error handling strategy routine. You don't need to | |
156 | * define one of these if you don't want to - there is a default | |
157 | * routine that is present that should work in most cases. For those | |
158 | * driver authors that have the inclination and ability to write their | |
159 | * own strategy routine, this is where it is specified. Note - the | |
160 | * strategy routine is *ALWAYS* run in the context of the kernel eh | |
161 | * thread. Thus you are guaranteed to *NOT* be in an interrupt | |
162 | * handler when you execute this, and you are also guaranteed to | |
163 | * *NOT* have any other commands being queued while you are in the | |
164 | * strategy routine. When you return from this function, operations | |
165 | * return to normal. | |
166 | * | |
167 | * See scsi_error.c scsi_unjam_host for additional comments about | |
168 | * what this function should and should not be attempting to do. | |
169 | * | |
170 | * Status: REQUIRED (at least one of them) | |
171 | */ | |
1da177e4 LT |
172 | int (* eh_abort_handler)(struct scsi_cmnd *); |
173 | int (* eh_device_reset_handler)(struct scsi_cmnd *); | |
30bd7df8 | 174 | int (* eh_target_reset_handler)(struct scsi_cmnd *); |
1da177e4 LT |
175 | int (* eh_bus_reset_handler)(struct scsi_cmnd *); |
176 | int (* eh_host_reset_handler)(struct scsi_cmnd *); | |
177 | ||
1da177e4 LT |
178 | /* |
179 | * Before the mid layer attempts to scan for a new device where none | |
180 | * currently exists, it will call this entry in your driver. Should | |
181 | * your driver need to allocate any structs or perform any other init | |
182 | * items in order to send commands to a currently unused target/lun | |
183 | * combo, then this is where you can perform those allocations. This | |
184 | * is specifically so that drivers won't have to perform any kind of | |
185 | * "is this a new device" checks in their queuecommand routine, | |
186 | * thereby making the hot path a bit quicker. | |
187 | * | |
188 | * Return values: 0 on success, non-0 on failure | |
189 | * | |
190 | * Deallocation: If we didn't find any devices at this ID, you will | |
191 | * get an immediate call to slave_destroy(). If we find something | |
192 | * here then you will get a call to slave_configure(), then the | |
193 | * device will be used for however long it is kept around, then when | |
194 | * the device is removed from the system (or * possibly at reboot | |
195 | * time), you will then get a call to slave_destroy(). This is | |
196 | * assuming you implement slave_configure and slave_destroy. | |
197 | * However, if you allocate memory and hang it off the device struct, | |
198 | * then you must implement the slave_destroy() routine at a minimum | |
199 | * in order to avoid leaking memory | |
200 | * each time a device is tore down. | |
201 | * | |
202 | * Status: OPTIONAL | |
203 | */ | |
204 | int (* slave_alloc)(struct scsi_device *); | |
205 | ||
206 | /* | |
207 | * Once the device has responded to an INQUIRY and we know the | |
208 | * device is online, we call into the low level driver with the | |
209 | * struct scsi_device *. If the low level device driver implements | |
210 | * this function, it *must* perform the task of setting the queue | |
211 | * depth on the device. All other tasks are optional and depend | |
212 | * on what the driver supports and various implementation details. | |
213 | * | |
214 | * Things currently recommended to be handled at this time include: | |
215 | * | |
216 | * 1. Setting the device queue depth. Proper setting of this is | |
217 | * described in the comments for scsi_adjust_queue_depth. | |
218 | * 2. Determining if the device supports the various synchronous | |
219 | * negotiation protocols. The device struct will already have | |
220 | * responded to INQUIRY and the results of the standard items | |
221 | * will have been shoved into the various device flag bits, eg. | |
222 | * device->sdtr will be true if the device supports SDTR messages. | |
223 | * 3. Allocating command structs that the device will need. | |
224 | * 4. Setting the default timeout on this device (if needed). | |
225 | * 5. Anything else the low level driver might want to do on a device | |
226 | * specific setup basis... | |
227 | * 6. Return 0 on success, non-0 on error. The device will be marked | |
228 | * as offline on error so that no access will occur. If you return | |
229 | * non-0, your slave_destroy routine will never get called for this | |
230 | * device, so don't leave any loose memory hanging around, clean | |
231 | * up after yourself before returning non-0 | |
232 | * | |
233 | * Status: OPTIONAL | |
234 | */ | |
235 | int (* slave_configure)(struct scsi_device *); | |
236 | ||
237 | /* | |
238 | * Immediately prior to deallocating the device and after all activity | |
239 | * has ceased the mid layer calls this point so that the low level | |
240 | * driver may completely detach itself from the scsi device and vice | |
241 | * versa. The low level driver is responsible for freeing any memory | |
242 | * it allocated in the slave_alloc or slave_configure calls. | |
243 | * | |
244 | * Status: OPTIONAL | |
245 | */ | |
246 | void (* slave_destroy)(struct scsi_device *); | |
247 | ||
a283bd37 JB |
248 | /* |
249 | * Before the mid layer attempts to scan for a new device attached | |
250 | * to a target where no target currently exists, it will call this | |
251 | * entry in your driver. Should your driver need to allocate any | |
252 | * structs or perform any other init items in order to send commands | |
253 | * to a currently unused target, then this is where you can perform | |
254 | * those allocations. | |
255 | * | |
256 | * Return values: 0 on success, non-0 on failure | |
257 | * | |
258 | * Status: OPTIONAL | |
259 | */ | |
260 | int (* target_alloc)(struct scsi_target *); | |
261 | ||
262 | /* | |
263 | * Immediately prior to deallocating the target structure, and | |
264 | * after all activity to attached scsi devices has ceased, the | |
265 | * midlayer calls this point so that the driver may deallocate | |
266 | * and terminate any references to the target. | |
267 | * | |
268 | * Status: OPTIONAL | |
269 | */ | |
270 | void (* target_destroy)(struct scsi_target *); | |
271 | ||
1aa8fab2 MW |
272 | /* |
273 | * If a host has the ability to discover targets on its own instead | |
274 | * of scanning the entire bus, it can fill in this function and | |
275 | * call scsi_scan_host(). This function will be called periodically | |
276 | * until it returns 1 with the scsi_host and the elapsed time of | |
277 | * the scan in jiffies. | |
278 | * | |
279 | * Status: OPTIONAL | |
280 | */ | |
281 | int (* scan_finished)(struct Scsi_Host *, unsigned long); | |
282 | ||
283 | /* | |
284 | * If the host wants to be called before the scan starts, but | |
285 | * after the midlayer has set up ready for the scan, it can fill | |
286 | * in this function. | |
d850bd34 PM |
287 | * |
288 | * Status: OPTIONAL | |
1aa8fab2 MW |
289 | */ |
290 | void (* scan_start)(struct Scsi_Host *); | |
291 | ||
1da177e4 | 292 | /* |
d850bd34 PM |
293 | * Fill in this function to allow the queue depth of this host |
294 | * to be changeable (on a per device basis). Returns either | |
1da177e4 LT |
295 | * the current queue depth setting (may be different from what |
296 | * was passed in) or an error. An error should only be | |
297 | * returned if the requested depth is legal but the driver was | |
298 | * unable to set it. If the requested depth is illegal, the | |
299 | * driver should set and return the closest legal queue depth. | |
300 | * | |
d850bd34 | 301 | * Status: OPTIONAL |
1da177e4 | 302 | */ |
e881a172 | 303 | int (* change_queue_depth)(struct scsi_device *, int, int); |
1da177e4 LT |
304 | |
305 | /* | |
d850bd34 | 306 | * Fill in this function to allow the changing of tag types |
1da177e4 LT |
307 | * (this also allows the enabling/disabling of tag command |
308 | * queueing). An error should only be returned if something | |
309 | * went wrong in the driver while trying to set the tag type. | |
310 | * If the driver doesn't support the requested tag type, then | |
311 | * it should set the closest type it does support without | |
312 | * returning an error. Returns the actual tag type set. | |
d850bd34 PM |
313 | * |
314 | * Status: OPTIONAL | |
1da177e4 LT |
315 | */ |
316 | int (* change_queue_type)(struct scsi_device *, int); | |
317 | ||
318 | /* | |
d850bd34 | 319 | * This function determines the BIOS parameters for a given |
1da177e4 LT |
320 | * harddisk. These tend to be numbers that are made up by |
321 | * the host adapter. Parameters: | |
322 | * size, device, list (heads, sectors, cylinders) | |
323 | * | |
d850bd34 PM |
324 | * Status: OPTIONAL |
325 | */ | |
1da177e4 LT |
326 | int (* bios_param)(struct scsi_device *, struct block_device *, |
327 | sector_t, int []); | |
328 | ||
72ec24bd TH |
329 | /* |
330 | * This function is called when one or more partitions on the | |
331 | * device reach beyond the end of the device. | |
332 | * | |
333 | * Status: OPTIONAL | |
334 | */ | |
335 | void (*unlock_native_capacity)(struct scsi_device *); | |
336 | ||
1da177e4 LT |
337 | /* |
338 | * Can be used to export driver statistics and other infos to the | |
339 | * world outside the kernel ie. userspace and it also provides an | |
340 | * interface to feed the driver with information. | |
341 | * | |
342 | * Status: OBSOLETE | |
343 | */ | |
344 | int (*proc_info)(struct Scsi_Host *, char *, char **, off_t, int, int); | |
345 | ||
6c5f8ce1 JB |
346 | /* |
347 | * This is an optional routine that allows the transport to become | |
348 | * involved when a scsi io timer fires. The return value tells the | |
349 | * timer routine how to finish the io timeout handling: | |
350 | * EH_HANDLED: I fixed the error, please complete the command | |
351 | * EH_RESET_TIMER: I need more time, reset the timer and | |
352 | * begin counting again | |
353 | * EH_NOT_HANDLED Begin normal error recovery | |
354 | * | |
355 | * Status: OPTIONAL | |
356 | */ | |
242f9dcb | 357 | enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); |
6c5f8ce1 | 358 | |
1da177e4 LT |
359 | /* |
360 | * Name of proc directory | |
361 | */ | |
b02b6bc4 | 362 | const char *proc_name; |
1da177e4 LT |
363 | |
364 | /* | |
365 | * Used to store the procfs directory if a driver implements the | |
366 | * proc_info method. | |
367 | */ | |
368 | struct proc_dir_entry *proc_dir; | |
369 | ||
370 | /* | |
371 | * This determines if we will use a non-interrupt driven | |
d850bd34 | 372 | * or an interrupt driven scheme. It is set to the maximum number |
1da177e4 LT |
373 | * of simultaneous commands a given host adapter will accept. |
374 | */ | |
375 | int can_queue; | |
376 | ||
377 | /* | |
378 | * In many instances, especially where disconnect / reconnect are | |
379 | * supported, our host also has an ID on the SCSI bus. If this is | |
380 | * the case, then it must be reserved. Please set this_id to -1 if | |
381 | * your setup is in single initiator mode, and the host lacks an | |
382 | * ID. | |
383 | */ | |
384 | int this_id; | |
385 | ||
386 | /* | |
387 | * This determines the degree to which the host adapter is capable | |
388 | * of scatter-gather. | |
389 | */ | |
390 | unsigned short sg_tablesize; | |
13f05c8d | 391 | unsigned short sg_prot_tablesize; |
1da177e4 LT |
392 | |
393 | /* | |
d850bd34 | 394 | * Set this if the host adapter has limitations beside segment count. |
1da177e4 LT |
395 | */ |
396 | unsigned short max_sectors; | |
397 | ||
398 | /* | |
d850bd34 | 399 | * DMA scatter gather segment boundary limit. A segment crossing this |
1da177e4 LT |
400 | * boundary will be split in two. |
401 | */ | |
402 | unsigned long dma_boundary; | |
403 | ||
404 | /* | |
405 | * This specifies "machine infinity" for host templates which don't | |
406 | * limit the transfer size. Note this limit represents an absolute | |
407 | * maximum, and may be over the transfer limits allowed for | |
d850bd34 | 408 | * individual devices (e.g. 256 for SCSI-1). |
1da177e4 LT |
409 | */ |
410 | #define SCSI_DEFAULT_MAX_SECTORS 1024 | |
411 | ||
412 | /* | |
413 | * True if this host adapter can make good use of linked commands. | |
414 | * This will allow more than one command to be queued to a given | |
415 | * unit on a given host. Set this to the maximum number of command | |
416 | * blocks to be provided for each device. Set this to 1 for one | |
417 | * command block per lun, 2 for two, etc. Do not set this to 0. | |
418 | * You should make sure that the host adapter will do the right thing | |
419 | * before you try setting this above 1. | |
420 | */ | |
421 | short cmd_per_lun; | |
422 | ||
423 | /* | |
424 | * present contains counter indicating how many boards of this | |
425 | * type were found when we did the scan. | |
426 | */ | |
427 | unsigned char present; | |
428 | ||
5dc2b89e FT |
429 | /* |
430 | * This specifies the mode that a LLD supports. | |
431 | */ | |
432 | unsigned supported_mode:2; | |
433 | ||
1da177e4 | 434 | /* |
d850bd34 | 435 | * True if this host adapter uses unchecked DMA onto an ISA bus. |
1da177e4 LT |
436 | */ |
437 | unsigned unchecked_isa_dma:1; | |
438 | ||
439 | /* | |
d850bd34 | 440 | * True if this host adapter can make good use of clustering. |
1da177e4 LT |
441 | * I originally thought that if the tablesize was large that it |
442 | * was a waste of CPU cycles to prepare a cluster list, but | |
443 | * it works out that the Buslogic is faster if you use a smaller | |
444 | * number of segments (i.e. use clustering). I guess it is | |
445 | * inefficient. | |
446 | */ | |
447 | unsigned use_clustering:1; | |
448 | ||
449 | /* | |
d850bd34 | 450 | * True for emulated SCSI host adapters (e.g. ATAPI). |
1da177e4 LT |
451 | */ |
452 | unsigned emulated:1; | |
453 | ||
454 | /* | |
455 | * True if the low-level driver performs its own reset-settle delays. | |
456 | */ | |
457 | unsigned skip_settle_delay:1; | |
458 | ||
459 | /* | |
d850bd34 | 460 | * True if we are using ordered write support. |
1da177e4 | 461 | */ |
1da177e4 LT |
462 | unsigned ordered_tag:1; |
463 | ||
464 | /* | |
d850bd34 | 465 | * Countdown for host blocking with no commands outstanding. |
1da177e4 LT |
466 | */ |
467 | unsigned int max_host_blocked; | |
468 | ||
469 | /* | |
470 | * Default value for the blocking. If the queue is empty, | |
471 | * host_blocked counts down in the request_fn until it restarts | |
472 | * host operations as zero is reached. | |
473 | * | |
474 | * FIXME: This should probably be a value in the template | |
475 | */ | |
476 | #define SCSI_DEFAULT_HOST_BLOCKED 7 | |
477 | ||
478 | /* | |
479 | * Pointer to the sysfs class properties for this host, NULL terminated. | |
480 | */ | |
ee959b00 | 481 | struct device_attribute **shost_attrs; |
1da177e4 LT |
482 | |
483 | /* | |
484 | * Pointer to the SCSI device properties for this host, NULL terminated. | |
485 | */ | |
486 | struct device_attribute **sdev_attrs; | |
487 | ||
488 | /* | |
489 | * List of hosts per template. | |
490 | * | |
491 | * This is only for use by scsi_module.c for legacy templates. | |
492 | * For these access to it is synchronized implicitly by | |
493 | * module_init/module_exit. | |
494 | */ | |
495 | struct list_head legacy_hosts; | |
9e4f5e29 JS |
496 | |
497 | /* | |
498 | * Vendor Identifier associated with the host | |
499 | * | |
500 | * Note: When specifying vendor_id, be sure to read the | |
501 | * Vendor Type and ID formatting requirements specified in | |
502 | * scsi_netlink.h | |
503 | */ | |
504 | u64 vendor_id; | |
1da177e4 LT |
505 | }; |
506 | ||
507 | /* | |
d3301874 MA |
508 | * shost state: If you alter this, you also need to alter scsi_sysfs.c |
509 | * (for the ascii descriptions) and the state model enforcer: | |
510 | * scsi_host_set_state() | |
1da177e4 | 511 | */ |
d3301874 MA |
512 | enum scsi_host_state { |
513 | SHOST_CREATED = 1, | |
514 | SHOST_RUNNING, | |
1da177e4 | 515 | SHOST_CANCEL, |
d3301874 | 516 | SHOST_DEL, |
1da177e4 | 517 | SHOST_RECOVERY, |
939647ee JB |
518 | SHOST_CANCEL_RECOVERY, |
519 | SHOST_DEL_RECOVERY, | |
1da177e4 LT |
520 | }; |
521 | ||
522 | struct Scsi_Host { | |
523 | /* | |
524 | * __devices is protected by the host_lock, but you should | |
525 | * usually use scsi_device_lookup / shost_for_each_device | |
526 | * to access it and don't care about locking yourself. | |
527 | * In the rare case of beeing in irq context you can use | |
528 | * their __ prefixed variants with the lock held. NEVER | |
529 | * access this list directly from a driver. | |
530 | */ | |
531 | struct list_head __devices; | |
532 | struct list_head __targets; | |
533 | ||
534 | struct scsi_host_cmd_pool *cmd_pool; | |
535 | spinlock_t free_list_lock; | |
536 | struct list_head free_list; /* backup store of cmd structs */ | |
537 | struct list_head starved_list; | |
538 | ||
539 | spinlock_t default_lock; | |
540 | spinlock_t *host_lock; | |
541 | ||
0b950672 | 542 | struct mutex scan_mutex;/* serialize scanning activity */ |
1da177e4 LT |
543 | |
544 | struct list_head eh_cmd_q; | |
545 | struct task_struct * ehandler; /* Error recovery thread. */ | |
7dfdc9a5 CH |
546 | struct completion * eh_action; /* Wait for specific actions on the |
547 | host. */ | |
1da177e4 LT |
548 | wait_queue_head_t host_wait; |
549 | struct scsi_host_template *hostt; | |
550 | struct scsi_transport_template *transportt; | |
06f81ea8 | 551 | |
86e33a29 | 552 | /* |
d850bd34 PM |
553 | * Area to keep a shared tag map (if needed, will be |
554 | * NULL if not). | |
86e33a29 JB |
555 | */ |
556 | struct blk_queue_tag *bqt; | |
557 | ||
06f81ea8 | 558 | /* |
559 | * The following two fields are protected with host_lock; | |
560 | * however, eh routines can safely access during eh processing | |
561 | * without acquiring the lock. | |
562 | */ | |
563 | unsigned int host_busy; /* commands actually active on low-level */ | |
564 | unsigned int host_failed; /* commands that failed. */ | |
ee7863bc | 565 | unsigned int host_eh_scheduled; /* EH scheduled without command */ |
1da177e4 | 566 | |
6d49f63b | 567 | unsigned int host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */ |
1da177e4 LT |
568 | int resetting; /* if set, it means that last_reset is a valid value */ |
569 | unsigned long last_reset; | |
570 | ||
571 | /* | |
572 | * These three parameters can be used to allow for wide scsi, | |
573 | * and for host adapters that support multiple busses | |
574 | * The first two should be set to 1 more than the actual max id | |
575 | * or lun (i.e. 8 for normal systems). | |
576 | */ | |
577 | unsigned int max_id; | |
578 | unsigned int max_lun; | |
579 | unsigned int max_channel; | |
580 | ||
581 | /* | |
582 | * This is a unique identifier that must be assigned so that we | |
583 | * have some way of identifying each detected host adapter properly | |
584 | * and uniquely. For hosts that do not support more than one card | |
585 | * in the system at one time, this does not need to be set. It is | |
586 | * initialized to 0 in scsi_register. | |
587 | */ | |
588 | unsigned int unique_id; | |
589 | ||
590 | /* | |
591 | * The maximum length of SCSI commands that this host can accept. | |
592 | * Probably 12 for most host adapters, but could be 16 for others. | |
db4742dd | 593 | * or 260 if the driver supports variable length cdbs. |
1da177e4 | 594 | * For drivers that don't set this field, a value of 12 is |
db4742dd | 595 | * assumed. |
1da177e4 | 596 | */ |
db4742dd | 597 | unsigned short max_cmd_len; |
1da177e4 LT |
598 | |
599 | int this_id; | |
600 | int can_queue; | |
601 | short cmd_per_lun; | |
602 | short unsigned int sg_tablesize; | |
13f05c8d | 603 | short unsigned int sg_prot_tablesize; |
1da177e4 LT |
604 | short unsigned int max_sectors; |
605 | unsigned long dma_boundary; | |
606 | /* | |
607 | * Used to assign serial numbers to the cmds. | |
608 | * Protected by the host lock. | |
609 | */ | |
12a44162 | 610 | unsigned long cmd_serial_number; |
1da177e4 | 611 | |
5dc2b89e | 612 | unsigned active_mode:2; |
1da177e4 LT |
613 | unsigned unchecked_isa_dma:1; |
614 | unsigned use_clustering:1; | |
615 | unsigned use_blk_tcq:1; | |
616 | ||
617 | /* | |
618 | * Host has requested that no further requests come through for the | |
619 | * time being. | |
620 | */ | |
621 | unsigned host_self_blocked:1; | |
622 | ||
623 | /* | |
624 | * Host uses correct SCSI ordering not PC ordering. The bit is | |
625 | * set for the minority of drivers whose authors actually read | |
d850bd34 | 626 | * the spec ;). |
1da177e4 LT |
627 | */ |
628 | unsigned reverse_ordering:1; | |
629 | ||
630 | /* | |
d850bd34 | 631 | * Ordered write support |
1da177e4 | 632 | */ |
1da177e4 LT |
633 | unsigned ordered_tag:1; |
634 | ||
d850bd34 | 635 | /* Task mgmt function in progress */ |
d7a1bb0a JS |
636 | unsigned tmf_in_progress:1; |
637 | ||
3e082a91 MW |
638 | /* Asynchronous scan in progress */ |
639 | unsigned async_scan:1; | |
640 | ||
1da177e4 LT |
641 | /* |
642 | * Optional work queue to be utilized by the transport | |
643 | */ | |
aab0de24 | 644 | char work_q_name[20]; |
1da177e4 LT |
645 | struct workqueue_struct *work_q; |
646 | ||
647 | /* | |
648 | * Host has rejected a command because it was busy. | |
649 | */ | |
650 | unsigned int host_blocked; | |
651 | ||
652 | /* | |
653 | * Value host_blocked counts down from | |
654 | */ | |
655 | unsigned int max_host_blocked; | |
656 | ||
4469f987 MP |
657 | /* Protection Information */ |
658 | unsigned int prot_capabilities; | |
659 | unsigned char prot_guard_type; | |
660 | ||
b58d9154 FT |
661 | /* |
662 | * q used for scsi_tgt msgs, async events or any other requests that | |
663 | * need to be processed in userspace | |
664 | */ | |
665 | struct request_queue *uspace_req_q; | |
666 | ||
1da177e4 LT |
667 | /* legacy crap */ |
668 | unsigned long base; | |
669 | unsigned long io_port; | |
670 | unsigned char n_io_port; | |
671 | unsigned char dma_channel; | |
672 | unsigned int irq; | |
673 | ||
674 | ||
d3301874 | 675 | enum scsi_host_state shost_state; |
1da177e4 LT |
676 | |
677 | /* ldm bits */ | |
ee959b00 | 678 | struct device shost_gendev, shost_dev; |
1da177e4 LT |
679 | |
680 | /* | |
681 | * List of hosts per template. | |
682 | * | |
683 | * This is only for use by scsi_module.c for legacy templates. | |
684 | * For these access to it is synchronized implicitly by | |
685 | * module_init/module_exit. | |
686 | */ | |
687 | struct list_head sht_legacy_list; | |
688 | ||
689 | /* | |
690 | * Points to the transport data (if any) which is allocated | |
691 | * separately | |
692 | */ | |
693 | void *shost_data; | |
694 | ||
d139b9bd JB |
695 | /* |
696 | * Points to the physical bus device we'd use to do DMA | |
697 | * Needed just in case we have virtual hosts. | |
698 | */ | |
699 | struct device *dma_dev; | |
700 | ||
1da177e4 LT |
701 | /* |
702 | * We should ensure that this is aligned, both for better performance | |
703 | * and also because some compilers (m68k) don't automatically force | |
704 | * alignment to a long boundary. | |
705 | */ | |
706 | unsigned long hostdata[0] /* Used for storage of host specific stuff */ | |
707 | __attribute__ ((aligned (sizeof(unsigned long)))); | |
708 | }; | |
709 | ||
710 | #define class_to_shost(d) \ | |
ee959b00 | 711 | container_of(d, struct Scsi_Host, shost_dev) |
1da177e4 | 712 | |
9ccfc756 JB |
713 | #define shost_printk(prefix, shost, fmt, a...) \ |
714 | dev_printk(prefix, &(shost)->shost_gendev, fmt, ##a) | |
715 | ||
bcd92c9f CH |
716 | static inline void *shost_priv(struct Scsi_Host *shost) |
717 | { | |
718 | return (void *)shost->hostdata; | |
719 | } | |
9ccfc756 | 720 | |
1da177e4 LT |
721 | int scsi_is_host_device(const struct device *); |
722 | ||
723 | static inline struct Scsi_Host *dev_to_shost(struct device *dev) | |
724 | { | |
725 | while (!scsi_is_host_device(dev)) { | |
726 | if (!dev->parent) | |
727 | return NULL; | |
728 | dev = dev->parent; | |
729 | } | |
730 | return container_of(dev, struct Scsi_Host, shost_gendev); | |
731 | } | |
732 | ||
939647ee JB |
733 | static inline int scsi_host_in_recovery(struct Scsi_Host *shost) |
734 | { | |
735 | return shost->shost_state == SHOST_RECOVERY || | |
736 | shost->shost_state == SHOST_CANCEL_RECOVERY || | |
d7a1bb0a JS |
737 | shost->shost_state == SHOST_DEL_RECOVERY || |
738 | shost->tmf_in_progress; | |
939647ee JB |
739 | } |
740 | ||
1da177e4 LT |
741 | extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *); |
742 | extern void scsi_flush_work(struct Scsi_Host *); | |
743 | ||
744 | extern struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *, int); | |
d139b9bd JB |
745 | extern int __must_check scsi_add_host_with_dma(struct Scsi_Host *, |
746 | struct device *, | |
747 | struct device *); | |
1da177e4 | 748 | extern void scsi_scan_host(struct Scsi_Host *); |
1da177e4 LT |
749 | extern void scsi_rescan_device(struct device *); |
750 | extern void scsi_remove_host(struct Scsi_Host *); | |
751 | extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *); | |
752 | extern void scsi_host_put(struct Scsi_Host *t); | |
753 | extern struct Scsi_Host *scsi_host_lookup(unsigned short); | |
d3301874 | 754 | extern const char *scsi_host_state_name(enum scsi_host_state); |
1da177e4 LT |
755 | |
756 | extern u64 scsi_calculate_bounce_limit(struct Scsi_Host *); | |
757 | ||
d139b9bd JB |
758 | static inline int __must_check scsi_add_host(struct Scsi_Host *host, |
759 | struct device *dev) | |
760 | { | |
761 | return scsi_add_host_with_dma(host, dev, dev); | |
762 | } | |
763 | ||
1da177e4 LT |
764 | static inline struct device *scsi_get_device(struct Scsi_Host *shost) |
765 | { | |
766 | return shost->shost_gendev.parent; | |
767 | } | |
768 | ||
82f29467 MA |
769 | /** |
770 | * scsi_host_scan_allowed - Is scanning of this host allowed | |
771 | * @shost: Pointer to Scsi_Host. | |
772 | **/ | |
773 | static inline int scsi_host_scan_allowed(struct Scsi_Host *shost) | |
774 | { | |
775 | return shost->shost_state == SHOST_RUNNING; | |
776 | } | |
777 | ||
1da177e4 LT |
778 | extern void scsi_unblock_requests(struct Scsi_Host *); |
779 | extern void scsi_block_requests(struct Scsi_Host *); | |
780 | ||
781 | struct class_container; | |
b58d9154 FT |
782 | |
783 | extern struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, | |
784 | void (*) (struct request_queue *)); | |
1da177e4 LT |
785 | /* |
786 | * These two functions are used to allocate and free a pseudo device | |
787 | * which will connect to the host adapter itself rather than any | |
788 | * physical device. You must deallocate when you are done with the | |
789 | * thing. This physical pseudo-device isn't real and won't be available | |
790 | * from any high-level drivers. | |
791 | */ | |
792 | extern void scsi_free_host_dev(struct scsi_device *); | |
793 | extern struct scsi_device *scsi_get_host_dev(struct Scsi_Host *); | |
794 | ||
4469f987 MP |
795 | /* |
796 | * DIF defines the exchange of protection information between | |
797 | * initiator and SBC block device. | |
798 | * | |
799 | * DIX defines the exchange of protection information between OS and | |
800 | * initiator. | |
801 | */ | |
802 | enum scsi_host_prot_capabilities { | |
803 | SHOST_DIF_TYPE1_PROTECTION = 1 << 0, /* T10 DIF Type 1 */ | |
804 | SHOST_DIF_TYPE2_PROTECTION = 1 << 1, /* T10 DIF Type 2 */ | |
805 | SHOST_DIF_TYPE3_PROTECTION = 1 << 2, /* T10 DIF Type 3 */ | |
806 | ||
807 | SHOST_DIX_TYPE0_PROTECTION = 1 << 3, /* DIX between OS and HBA only */ | |
808 | SHOST_DIX_TYPE1_PROTECTION = 1 << 4, /* DIX with DIF Type 1 */ | |
809 | SHOST_DIX_TYPE2_PROTECTION = 1 << 5, /* DIX with DIF Type 2 */ | |
810 | SHOST_DIX_TYPE3_PROTECTION = 1 << 6, /* DIX with DIF Type 3 */ | |
811 | }; | |
812 | ||
813 | /* | |
814 | * SCSI hosts which support the Data Integrity Extensions must | |
815 | * indicate their capabilities by setting the prot_capabilities using | |
816 | * this call. | |
817 | */ | |
818 | static inline void scsi_host_set_prot(struct Scsi_Host *shost, unsigned int mask) | |
819 | { | |
820 | shost->prot_capabilities = mask; | |
821 | } | |
822 | ||
823 | static inline unsigned int scsi_host_get_prot(struct Scsi_Host *shost) | |
824 | { | |
825 | return shost->prot_capabilities; | |
826 | } | |
827 | ||
13f05c8d MP |
828 | static inline int scsi_host_prot_dma(struct Scsi_Host *shost) |
829 | { | |
830 | return shost->prot_capabilities >= SHOST_DIX_TYPE0_PROTECTION; | |
831 | } | |
832 | ||
4469f987 MP |
833 | static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type) |
834 | { | |
b2b465e9 MP |
835 | static unsigned char cap[] = { 0, |
836 | SHOST_DIF_TYPE1_PROTECTION, | |
837 | SHOST_DIF_TYPE2_PROTECTION, | |
838 | SHOST_DIF_TYPE3_PROTECTION }; | |
4469f987 | 839 | |
b2b465e9 | 840 | return shost->prot_capabilities & cap[target_type] ? target_type : 0; |
4469f987 MP |
841 | } |
842 | ||
843 | static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type) | |
844 | { | |
35e1a5d9 | 845 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
b2b465e9 MP |
846 | static unsigned char cap[] = { SHOST_DIX_TYPE0_PROTECTION, |
847 | SHOST_DIX_TYPE1_PROTECTION, | |
848 | SHOST_DIX_TYPE2_PROTECTION, | |
849 | SHOST_DIX_TYPE3_PROTECTION }; | |
850 | ||
851 | return shost->prot_capabilities & cap[target_type]; | |
35e1a5d9 | 852 | #endif |
4469f987 MP |
853 | return 0; |
854 | } | |
855 | ||
856 | /* | |
857 | * All DIX-capable initiators must support the T10-mandated CRC | |
858 | * checksum. Controllers can optionally implement the IP checksum | |
859 | * scheme which has much lower impact on system performance. Note | |
860 | * that the main rationale for the checksum is to match integrity | |
861 | * metadata with data. Detecting bit errors are a job for ECC memory | |
862 | * and buses. | |
863 | */ | |
864 | ||
865 | enum scsi_host_guard_type { | |
866 | SHOST_DIX_GUARD_CRC = 1 << 0, | |
867 | SHOST_DIX_GUARD_IP = 1 << 1, | |
868 | }; | |
869 | ||
870 | static inline void scsi_host_set_guard(struct Scsi_Host *shost, unsigned char type) | |
871 | { | |
872 | shost->prot_guard_type = type; | |
873 | } | |
874 | ||
875 | static inline unsigned char scsi_host_get_guard(struct Scsi_Host *shost) | |
876 | { | |
877 | return shost->prot_guard_type; | |
878 | } | |
879 | ||
1da177e4 LT |
880 | /* legacy interfaces */ |
881 | extern struct Scsi_Host *scsi_register(struct scsi_host_template *, int); | |
882 | extern void scsi_unregister(struct Scsi_Host *); | |
47ba39ee | 883 | extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state); |
1da177e4 LT |
884 | |
885 | #endif /* _SCSI_SCSI_HOST_H */ |