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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> |
0ffddfbb | 9 | #include <linux/seq_file.h> |
d285203c | 10 | #include <linux/blk-mq.h> |
4660c8ed | 11 | #include <scsi/scsi.h> |
1da177e4 | 12 | |
b58d9154 | 13 | struct request_queue; |
1da177e4 | 14 | struct block_device; |
7dfdc9a5 | 15 | struct completion; |
1da177e4 LT |
16 | struct module; |
17 | struct scsi_cmnd; | |
18 | struct scsi_device; | |
89d9a567 | 19 | struct scsi_host_cmd_pool; |
a283bd37 | 20 | struct scsi_target; |
1da177e4 LT |
21 | struct Scsi_Host; |
22 | struct scsi_host_cmd_pool; | |
23 | struct scsi_transport_template; | |
86e33a29 | 24 | struct blk_queue_tags; |
1da177e4 LT |
25 | |
26 | ||
27 | /* | |
28 | * The various choices mean: | |
29 | * NONE: Self evident. Host adapter is not capable of scatter-gather. | |
30 | * ALL: Means that the host adapter module can do scatter-gather, | |
31 | * and that there is no limit to the size of the table to which | |
4660c8ed JB |
32 | * we scatter/gather data. The value we set here is the maximum |
33 | * single element sglist. To use chained sglists, the adapter | |
34 | * has to set a value beyond ALL (and correctly use the chain | |
35 | * handling API. | |
1da177e4 LT |
36 | * Anything else: Indicates the maximum number of chains that can be |
37 | * used in one scatter-gather request. | |
38 | */ | |
39 | #define SG_NONE 0 | |
4660c8ed | 40 | #define SG_ALL SCSI_MAX_SG_SEGMENTS |
1da177e4 | 41 | |
5dc2b89e FT |
42 | #define MODE_UNKNOWN 0x00 |
43 | #define MODE_INITIATOR 0x01 | |
44 | #define MODE_TARGET 0x02 | |
1da177e4 LT |
45 | |
46 | #define DISABLE_CLUSTERING 0 | |
47 | #define ENABLE_CLUSTERING 1 | |
48 | ||
e881a172 MC |
49 | enum { |
50 | SCSI_QDEPTH_DEFAULT, /* default requested change, e.g. from sysfs */ | |
e881a172 MC |
51 | }; |
52 | ||
1da177e4 LT |
53 | struct scsi_host_template { |
54 | struct module *module; | |
55 | const char *name; | |
56 | ||
57 | /* | |
58 | * Used to initialize old-style drivers. For new-style drivers | |
59 | * just perform all work in your module initialization function. | |
60 | * | |
61 | * Status: OBSOLETE | |
62 | */ | |
63 | int (* detect)(struct scsi_host_template *); | |
64 | ||
65 | /* | |
66 | * Used as unload callback for hosts with old-style drivers. | |
67 | * | |
68 | * Status: OBSOLETE | |
69 | */ | |
70 | int (* release)(struct Scsi_Host *); | |
71 | ||
72 | /* | |
73 | * The info function will return whatever useful information the | |
74 | * developer sees fit. If not provided, then the name field will | |
75 | * be used instead. | |
76 | * | |
77 | * Status: OPTIONAL | |
78 | */ | |
79 | const char *(* info)(struct Scsi_Host *); | |
80 | ||
81 | /* | |
82 | * Ioctl interface | |
83 | * | |
84 | * Status: OPTIONAL | |
85 | */ | |
86 | int (* ioctl)(struct scsi_device *dev, int cmd, void __user *arg); | |
87 | ||
88 | ||
89 | #ifdef CONFIG_COMPAT | |
90 | /* | |
91 | * Compat handler. Handle 32bit ABI. | |
92 | * When unknown ioctl is passed return -ENOIOCTLCMD. | |
93 | * | |
94 | * Status: OPTIONAL | |
95 | */ | |
96 | int (* compat_ioctl)(struct scsi_device *dev, int cmd, void __user *arg); | |
97 | #endif | |
98 | ||
99 | /* | |
100 | * The queuecommand function is used to queue up a scsi | |
101 | * command block to the LLDD. When the driver finished | |
102 | * processing the command the done callback is invoked. | |
103 | * | |
104 | * If queuecommand returns 0, then the HBA has accepted the | |
105 | * command. The done() function must be called on the command | |
106 | * when the driver has finished with it. (you may call done on the | |
107 | * command before queuecommand returns, but in this case you | |
108 | * *must* return 0 from queuecommand). | |
109 | * | |
110 | * Queuecommand may also reject the command, in which case it may | |
111 | * not touch the command and must not call done() for it. | |
112 | * | |
113 | * There are two possible rejection returns: | |
114 | * | |
115 | * SCSI_MLQUEUE_DEVICE_BUSY: Block this device temporarily, but | |
116 | * allow commands to other devices serviced by this host. | |
117 | * | |
118 | * SCSI_MLQUEUE_HOST_BUSY: Block all devices served by this | |
119 | * host temporarily. | |
120 | * | |
121 | * For compatibility, any other non-zero return is treated the | |
122 | * same as SCSI_MLQUEUE_HOST_BUSY. | |
123 | * | |
124 | * NOTE: "temporarily" means either until the next command for# | |
125 | * this device/host completes, or a period of time determined by | |
126 | * I/O pressure in the system if there are no other outstanding | |
127 | * commands. | |
128 | * | |
129 | * STATUS: REQUIRED | |
130 | */ | |
f281233d | 131 | int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *); |
1da177e4 LT |
132 | |
133 | /* | |
134 | * This is an error handling strategy routine. You don't need to | |
135 | * define one of these if you don't want to - there is a default | |
136 | * routine that is present that should work in most cases. For those | |
137 | * driver authors that have the inclination and ability to write their | |
138 | * own strategy routine, this is where it is specified. Note - the | |
139 | * strategy routine is *ALWAYS* run in the context of the kernel eh | |
140 | * thread. Thus you are guaranteed to *NOT* be in an interrupt | |
141 | * handler when you execute this, and you are also guaranteed to | |
142 | * *NOT* have any other commands being queued while you are in the | |
143 | * strategy routine. When you return from this function, operations | |
144 | * return to normal. | |
145 | * | |
146 | * See scsi_error.c scsi_unjam_host for additional comments about | |
147 | * what this function should and should not be attempting to do. | |
148 | * | |
149 | * Status: REQUIRED (at least one of them) | |
150 | */ | |
1da177e4 LT |
151 | int (* eh_abort_handler)(struct scsi_cmnd *); |
152 | int (* eh_device_reset_handler)(struct scsi_cmnd *); | |
30bd7df8 | 153 | int (* eh_target_reset_handler)(struct scsi_cmnd *); |
1da177e4 LT |
154 | int (* eh_bus_reset_handler)(struct scsi_cmnd *); |
155 | int (* eh_host_reset_handler)(struct scsi_cmnd *); | |
156 | ||
1da177e4 LT |
157 | /* |
158 | * Before the mid layer attempts to scan for a new device where none | |
159 | * currently exists, it will call this entry in your driver. Should | |
160 | * your driver need to allocate any structs or perform any other init | |
161 | * items in order to send commands to a currently unused target/lun | |
162 | * combo, then this is where you can perform those allocations. This | |
163 | * is specifically so that drivers won't have to perform any kind of | |
164 | * "is this a new device" checks in their queuecommand routine, | |
165 | * thereby making the hot path a bit quicker. | |
166 | * | |
167 | * Return values: 0 on success, non-0 on failure | |
168 | * | |
169 | * Deallocation: If we didn't find any devices at this ID, you will | |
170 | * get an immediate call to slave_destroy(). If we find something | |
171 | * here then you will get a call to slave_configure(), then the | |
172 | * device will be used for however long it is kept around, then when | |
173 | * the device is removed from the system (or * possibly at reboot | |
174 | * time), you will then get a call to slave_destroy(). This is | |
175 | * assuming you implement slave_configure and slave_destroy. | |
176 | * However, if you allocate memory and hang it off the device struct, | |
177 | * then you must implement the slave_destroy() routine at a minimum | |
178 | * in order to avoid leaking memory | |
179 | * each time a device is tore down. | |
180 | * | |
181 | * Status: OPTIONAL | |
182 | */ | |
183 | int (* slave_alloc)(struct scsi_device *); | |
184 | ||
185 | /* | |
186 | * Once the device has responded to an INQUIRY and we know the | |
187 | * device is online, we call into the low level driver with the | |
188 | * struct scsi_device *. If the low level device driver implements | |
189 | * this function, it *must* perform the task of setting the queue | |
190 | * depth on the device. All other tasks are optional and depend | |
191 | * on what the driver supports and various implementation details. | |
192 | * | |
193 | * Things currently recommended to be handled at this time include: | |
194 | * | |
195 | * 1. Setting the device queue depth. Proper setting of this is | |
196 | * described in the comments for scsi_adjust_queue_depth. | |
197 | * 2. Determining if the device supports the various synchronous | |
198 | * negotiation protocols. The device struct will already have | |
199 | * responded to INQUIRY and the results of the standard items | |
200 | * will have been shoved into the various device flag bits, eg. | |
201 | * device->sdtr will be true if the device supports SDTR messages. | |
202 | * 3. Allocating command structs that the device will need. | |
203 | * 4. Setting the default timeout on this device (if needed). | |
204 | * 5. Anything else the low level driver might want to do on a device | |
205 | * specific setup basis... | |
206 | * 6. Return 0 on success, non-0 on error. The device will be marked | |
207 | * as offline on error so that no access will occur. If you return | |
208 | * non-0, your slave_destroy routine will never get called for this | |
209 | * device, so don't leave any loose memory hanging around, clean | |
210 | * up after yourself before returning non-0 | |
211 | * | |
212 | * Status: OPTIONAL | |
213 | */ | |
214 | int (* slave_configure)(struct scsi_device *); | |
215 | ||
216 | /* | |
217 | * Immediately prior to deallocating the device and after all activity | |
218 | * has ceased the mid layer calls this point so that the low level | |
219 | * driver may completely detach itself from the scsi device and vice | |
220 | * versa. The low level driver is responsible for freeing any memory | |
221 | * it allocated in the slave_alloc or slave_configure calls. | |
222 | * | |
223 | * Status: OPTIONAL | |
224 | */ | |
225 | void (* slave_destroy)(struct scsi_device *); | |
226 | ||
a283bd37 JB |
227 | /* |
228 | * Before the mid layer attempts to scan for a new device attached | |
229 | * to a target where no target currently exists, it will call this | |
230 | * entry in your driver. Should your driver need to allocate any | |
231 | * structs or perform any other init items in order to send commands | |
232 | * to a currently unused target, then this is where you can perform | |
233 | * those allocations. | |
234 | * | |
235 | * Return values: 0 on success, non-0 on failure | |
236 | * | |
237 | * Status: OPTIONAL | |
238 | */ | |
239 | int (* target_alloc)(struct scsi_target *); | |
240 | ||
241 | /* | |
242 | * Immediately prior to deallocating the target structure, and | |
243 | * after all activity to attached scsi devices has ceased, the | |
244 | * midlayer calls this point so that the driver may deallocate | |
245 | * and terminate any references to the target. | |
246 | * | |
247 | * Status: OPTIONAL | |
248 | */ | |
249 | void (* target_destroy)(struct scsi_target *); | |
250 | ||
1aa8fab2 MW |
251 | /* |
252 | * If a host has the ability to discover targets on its own instead | |
253 | * of scanning the entire bus, it can fill in this function and | |
254 | * call scsi_scan_host(). This function will be called periodically | |
255 | * until it returns 1 with the scsi_host and the elapsed time of | |
256 | * the scan in jiffies. | |
257 | * | |
258 | * Status: OPTIONAL | |
259 | */ | |
260 | int (* scan_finished)(struct Scsi_Host *, unsigned long); | |
261 | ||
262 | /* | |
263 | * If the host wants to be called before the scan starts, but | |
264 | * after the midlayer has set up ready for the scan, it can fill | |
265 | * in this function. | |
d850bd34 PM |
266 | * |
267 | * Status: OPTIONAL | |
1aa8fab2 MW |
268 | */ |
269 | void (* scan_start)(struct Scsi_Host *); | |
270 | ||
1da177e4 | 271 | /* |
d850bd34 PM |
272 | * Fill in this function to allow the queue depth of this host |
273 | * to be changeable (on a per device basis). Returns either | |
1da177e4 LT |
274 | * the current queue depth setting (may be different from what |
275 | * was passed in) or an error. An error should only be | |
276 | * returned if the requested depth is legal but the driver was | |
277 | * unable to set it. If the requested depth is illegal, the | |
278 | * driver should set and return the closest legal queue depth. | |
279 | * | |
d850bd34 | 280 | * Status: OPTIONAL |
1da177e4 | 281 | */ |
e881a172 | 282 | int (* change_queue_depth)(struct scsi_device *, int, int); |
1da177e4 LT |
283 | |
284 | /* | |
d850bd34 | 285 | * Fill in this function to allow the changing of tag types |
1da177e4 LT |
286 | * (this also allows the enabling/disabling of tag command |
287 | * queueing). An error should only be returned if something | |
288 | * went wrong in the driver while trying to set the tag type. | |
289 | * If the driver doesn't support the requested tag type, then | |
290 | * it should set the closest type it does support without | |
291 | * returning an error. Returns the actual tag type set. | |
d850bd34 PM |
292 | * |
293 | * Status: OPTIONAL | |
1da177e4 LT |
294 | */ |
295 | int (* change_queue_type)(struct scsi_device *, int); | |
296 | ||
297 | /* | |
d850bd34 | 298 | * This function determines the BIOS parameters for a given |
1da177e4 LT |
299 | * harddisk. These tend to be numbers that are made up by |
300 | * the host adapter. Parameters: | |
301 | * size, device, list (heads, sectors, cylinders) | |
302 | * | |
d850bd34 PM |
303 | * Status: OPTIONAL |
304 | */ | |
1da177e4 LT |
305 | int (* bios_param)(struct scsi_device *, struct block_device *, |
306 | sector_t, int []); | |
307 | ||
72ec24bd TH |
308 | /* |
309 | * This function is called when one or more partitions on the | |
310 | * device reach beyond the end of the device. | |
311 | * | |
312 | * Status: OPTIONAL | |
313 | */ | |
314 | void (*unlock_native_capacity)(struct scsi_device *); | |
315 | ||
1da177e4 LT |
316 | /* |
317 | * Can be used to export driver statistics and other infos to the | |
318 | * world outside the kernel ie. userspace and it also provides an | |
319 | * interface to feed the driver with information. | |
320 | * | |
321 | * Status: OBSOLETE | |
322 | */ | |
0ffddfbb AV |
323 | int (*show_info)(struct seq_file *, struct Scsi_Host *); |
324 | int (*write_info)(struct Scsi_Host *, char *, int); | |
1da177e4 | 325 | |
6c5f8ce1 JB |
326 | /* |
327 | * This is an optional routine that allows the transport to become | |
328 | * involved when a scsi io timer fires. The return value tells the | |
329 | * timer routine how to finish the io timeout handling: | |
330 | * EH_HANDLED: I fixed the error, please complete the command | |
331 | * EH_RESET_TIMER: I need more time, reset the timer and | |
332 | * begin counting again | |
333 | * EH_NOT_HANDLED Begin normal error recovery | |
334 | * | |
335 | * Status: OPTIONAL | |
336 | */ | |
242f9dcb | 337 | enum blk_eh_timer_return (*eh_timed_out)(struct scsi_cmnd *); |
6c5f8ce1 | 338 | |
29443691 VC |
339 | /* This is an optional routine that allows transport to initiate |
340 | * LLD adapter or firmware reset using sysfs attribute. | |
341 | * | |
342 | * Return values: 0 on success, -ve value on failure. | |
343 | * | |
344 | * Status: OPTIONAL | |
345 | */ | |
346 | ||
347 | int (*host_reset)(struct Scsi_Host *shost, int reset_type); | |
348 | #define SCSI_ADAPTER_RESET 1 | |
349 | #define SCSI_FIRMWARE_RESET 2 | |
350 | ||
351 | ||
1da177e4 LT |
352 | /* |
353 | * Name of proc directory | |
354 | */ | |
b02b6bc4 | 355 | const char *proc_name; |
1da177e4 LT |
356 | |
357 | /* | |
358 | * Used to store the procfs directory if a driver implements the | |
70ef457d | 359 | * show_info method. |
1da177e4 LT |
360 | */ |
361 | struct proc_dir_entry *proc_dir; | |
362 | ||
363 | /* | |
364 | * This determines if we will use a non-interrupt driven | |
d850bd34 | 365 | * or an interrupt driven scheme. It is set to the maximum number |
1da177e4 LT |
366 | * of simultaneous commands a given host adapter will accept. |
367 | */ | |
368 | int can_queue; | |
369 | ||
370 | /* | |
371 | * In many instances, especially where disconnect / reconnect are | |
372 | * supported, our host also has an ID on the SCSI bus. If this is | |
373 | * the case, then it must be reserved. Please set this_id to -1 if | |
374 | * your setup is in single initiator mode, and the host lacks an | |
375 | * ID. | |
376 | */ | |
377 | int this_id; | |
378 | ||
379 | /* | |
380 | * This determines the degree to which the host adapter is capable | |
381 | * of scatter-gather. | |
382 | */ | |
383 | unsigned short sg_tablesize; | |
13f05c8d | 384 | unsigned short sg_prot_tablesize; |
1da177e4 LT |
385 | |
386 | /* | |
d850bd34 | 387 | * Set this if the host adapter has limitations beside segment count. |
1da177e4 | 388 | */ |
8ed5a4d2 | 389 | unsigned int max_sectors; |
1da177e4 LT |
390 | |
391 | /* | |
d850bd34 | 392 | * DMA scatter gather segment boundary limit. A segment crossing this |
1da177e4 LT |
393 | * boundary will be split in two. |
394 | */ | |
395 | unsigned long dma_boundary; | |
396 | ||
397 | /* | |
398 | * This specifies "machine infinity" for host templates which don't | |
399 | * limit the transfer size. Note this limit represents an absolute | |
400 | * maximum, and may be over the transfer limits allowed for | |
d850bd34 | 401 | * individual devices (e.g. 256 for SCSI-1). |
1da177e4 LT |
402 | */ |
403 | #define SCSI_DEFAULT_MAX_SECTORS 1024 | |
404 | ||
405 | /* | |
406 | * True if this host adapter can make good use of linked commands. | |
407 | * This will allow more than one command to be queued to a given | |
408 | * unit on a given host. Set this to the maximum number of command | |
409 | * blocks to be provided for each device. Set this to 1 for one | |
410 | * command block per lun, 2 for two, etc. Do not set this to 0. | |
411 | * You should make sure that the host adapter will do the right thing | |
412 | * before you try setting this above 1. | |
413 | */ | |
414 | short cmd_per_lun; | |
415 | ||
416 | /* | |
417 | * present contains counter indicating how many boards of this | |
418 | * type were found when we did the scan. | |
419 | */ | |
420 | unsigned char present; | |
421 | ||
2ecb204d CH |
422 | /* |
423 | * Let the block layer assigns tags to all commands. | |
424 | */ | |
425 | unsigned use_blk_tags:1; | |
426 | ||
c40ecc12 CH |
427 | /* |
428 | * Track QUEUE_FULL events and reduce queue depth on demand. | |
429 | */ | |
430 | unsigned track_queue_depth:1; | |
431 | ||
5dc2b89e FT |
432 | /* |
433 | * This specifies the mode that a LLD supports. | |
434 | */ | |
435 | unsigned supported_mode:2; | |
436 | ||
1da177e4 | 437 | /* |
d850bd34 | 438 | * True if this host adapter uses unchecked DMA onto an ISA bus. |
1da177e4 LT |
439 | */ |
440 | unsigned unchecked_isa_dma:1; | |
441 | ||
442 | /* | |
d850bd34 | 443 | * True if this host adapter can make good use of clustering. |
1da177e4 LT |
444 | * I originally thought that if the tablesize was large that it |
445 | * was a waste of CPU cycles to prepare a cluster list, but | |
446 | * it works out that the Buslogic is faster if you use a smaller | |
447 | * number of segments (i.e. use clustering). I guess it is | |
448 | * inefficient. | |
449 | */ | |
450 | unsigned use_clustering:1; | |
451 | ||
452 | /* | |
d850bd34 | 453 | * True for emulated SCSI host adapters (e.g. ATAPI). |
1da177e4 LT |
454 | */ |
455 | unsigned emulated:1; | |
456 | ||
457 | /* | |
458 | * True if the low-level driver performs its own reset-settle delays. | |
459 | */ | |
460 | unsigned skip_settle_delay:1; | |
461 | ||
54b2b50c MP |
462 | /* True if the controller does not support WRITE SAME */ |
463 | unsigned no_write_same:1; | |
464 | ||
e494f6a7 HR |
465 | /* |
466 | * True if asynchronous aborts are not supported | |
467 | */ | |
468 | unsigned no_async_abort:1; | |
469 | ||
1da177e4 | 470 | /* |
d850bd34 | 471 | * Countdown for host blocking with no commands outstanding. |
1da177e4 LT |
472 | */ |
473 | unsigned int max_host_blocked; | |
474 | ||
475 | /* | |
476 | * Default value for the blocking. If the queue is empty, | |
477 | * host_blocked counts down in the request_fn until it restarts | |
478 | * host operations as zero is reached. | |
479 | * | |
480 | * FIXME: This should probably be a value in the template | |
481 | */ | |
482 | #define SCSI_DEFAULT_HOST_BLOCKED 7 | |
483 | ||
484 | /* | |
485 | * Pointer to the sysfs class properties for this host, NULL terminated. | |
486 | */ | |
ee959b00 | 487 | struct device_attribute **shost_attrs; |
1da177e4 LT |
488 | |
489 | /* | |
490 | * Pointer to the SCSI device properties for this host, NULL terminated. | |
491 | */ | |
492 | struct device_attribute **sdev_attrs; | |
493 | ||
494 | /* | |
495 | * List of hosts per template. | |
496 | * | |
497 | * This is only for use by scsi_module.c for legacy templates. | |
498 | * For these access to it is synchronized implicitly by | |
499 | * module_init/module_exit. | |
500 | */ | |
501 | struct list_head legacy_hosts; | |
9e4f5e29 JS |
502 | |
503 | /* | |
504 | * Vendor Identifier associated with the host | |
505 | * | |
506 | * Note: When specifying vendor_id, be sure to read the | |
507 | * Vendor Type and ID formatting requirements specified in | |
508 | * scsi_netlink.h | |
509 | */ | |
510 | u64 vendor_id; | |
89d9a567 CH |
511 | |
512 | /* | |
513 | * Additional per-command data allocated for the driver. | |
514 | */ | |
515 | unsigned int cmd_size; | |
516 | struct scsi_host_cmd_pool *cmd_pool; | |
d285203c CH |
517 | |
518 | /* temporary flag to disable blk-mq I/O path */ | |
519 | bool disable_blk_mq; | |
1da177e4 LT |
520 | }; |
521 | ||
f281233d JG |
522 | /* |
523 | * Temporary #define for host lock push down. Can be removed when all | |
524 | * drivers have been updated to take advantage of unlocked | |
525 | * queuecommand. | |
526 | * | |
527 | */ | |
528 | #define DEF_SCSI_QCMD(func_name) \ | |
529 | int func_name(struct Scsi_Host *shost, struct scsi_cmnd *cmd) \ | |
530 | { \ | |
531 | unsigned long irq_flags; \ | |
532 | int rc; \ | |
533 | spin_lock_irqsave(shost->host_lock, irq_flags); \ | |
534 | scsi_cmd_get_serial(shost, cmd); \ | |
535 | rc = func_name##_lck (cmd, cmd->scsi_done); \ | |
536 | spin_unlock_irqrestore(shost->host_lock, irq_flags); \ | |
537 | return rc; \ | |
538 | } | |
539 | ||
540 | ||
1da177e4 | 541 | /* |
d3301874 MA |
542 | * shost state: If you alter this, you also need to alter scsi_sysfs.c |
543 | * (for the ascii descriptions) and the state model enforcer: | |
544 | * scsi_host_set_state() | |
1da177e4 | 545 | */ |
d3301874 MA |
546 | enum scsi_host_state { |
547 | SHOST_CREATED = 1, | |
548 | SHOST_RUNNING, | |
1da177e4 | 549 | SHOST_CANCEL, |
d3301874 | 550 | SHOST_DEL, |
1da177e4 | 551 | SHOST_RECOVERY, |
939647ee JB |
552 | SHOST_CANCEL_RECOVERY, |
553 | SHOST_DEL_RECOVERY, | |
1da177e4 LT |
554 | }; |
555 | ||
556 | struct Scsi_Host { | |
557 | /* | |
558 | * __devices is protected by the host_lock, but you should | |
559 | * usually use scsi_device_lookup / shost_for_each_device | |
560 | * to access it and don't care about locking yourself. | |
561 | * In the rare case of beeing in irq context you can use | |
562 | * their __ prefixed variants with the lock held. NEVER | |
563 | * access this list directly from a driver. | |
564 | */ | |
565 | struct list_head __devices; | |
566 | struct list_head __targets; | |
567 | ||
568 | struct scsi_host_cmd_pool *cmd_pool; | |
569 | spinlock_t free_list_lock; | |
570 | struct list_head free_list; /* backup store of cmd structs */ | |
571 | struct list_head starved_list; | |
572 | ||
573 | spinlock_t default_lock; | |
574 | spinlock_t *host_lock; | |
575 | ||
0b950672 | 576 | struct mutex scan_mutex;/* serialize scanning activity */ |
1da177e4 LT |
577 | |
578 | struct list_head eh_cmd_q; | |
579 | struct task_struct * ehandler; /* Error recovery thread. */ | |
7dfdc9a5 CH |
580 | struct completion * eh_action; /* Wait for specific actions on the |
581 | host. */ | |
1da177e4 LT |
582 | wait_queue_head_t host_wait; |
583 | struct scsi_host_template *hostt; | |
584 | struct scsi_transport_template *transportt; | |
06f81ea8 | 585 | |
86e33a29 | 586 | /* |
d850bd34 PM |
587 | * Area to keep a shared tag map (if needed, will be |
588 | * NULL if not). | |
86e33a29 | 589 | */ |
d285203c CH |
590 | union { |
591 | struct blk_queue_tag *bqt; | |
592 | struct blk_mq_tag_set tag_set; | |
593 | }; | |
86e33a29 | 594 | |
74665016 | 595 | atomic_t host_busy; /* commands actually active on low-level */ |
cd9070c9 CH |
596 | atomic_t host_blocked; |
597 | ||
74665016 CH |
598 | unsigned int host_failed; /* commands that failed. |
599 | protected by host_lock */ | |
ee7863bc | 600 | unsigned int host_eh_scheduled; /* EH scheduled without command */ |
1da177e4 | 601 | |
6d49f63b | 602 | unsigned int host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */ |
1da177e4 | 603 | |
b4562022 HR |
604 | /* next two fields are used to bound the time spent in error handling */ |
605 | int eh_deadline; | |
606 | unsigned long last_reset; | |
607 | ||
608 | ||
1da177e4 LT |
609 | /* |
610 | * These three parameters can be used to allow for wide scsi, | |
611 | * and for host adapters that support multiple busses | |
8e4a5da6 | 612 | * The last two should be set to 1 more than the actual max id |
1abf635d | 613 | * or lun (e.g. 8 for SCSI parallel systems). |
1da177e4 | 614 | */ |
1da177e4 | 615 | unsigned int max_channel; |
1abf635d HR |
616 | unsigned int max_id; |
617 | u64 max_lun; | |
1da177e4 LT |
618 | |
619 | /* | |
620 | * This is a unique identifier that must be assigned so that we | |
621 | * have some way of identifying each detected host adapter properly | |
622 | * and uniquely. For hosts that do not support more than one card | |
623 | * in the system at one time, this does not need to be set. It is | |
624 | * initialized to 0 in scsi_register. | |
625 | */ | |
626 | unsigned int unique_id; | |
627 | ||
628 | /* | |
629 | * The maximum length of SCSI commands that this host can accept. | |
630 | * Probably 12 for most host adapters, but could be 16 for others. | |
db4742dd | 631 | * or 260 if the driver supports variable length cdbs. |
1da177e4 | 632 | * For drivers that don't set this field, a value of 12 is |
db4742dd | 633 | * assumed. |
1da177e4 | 634 | */ |
db4742dd | 635 | unsigned short max_cmd_len; |
1da177e4 LT |
636 | |
637 | int this_id; | |
638 | int can_queue; | |
639 | short cmd_per_lun; | |
640 | short unsigned int sg_tablesize; | |
13f05c8d | 641 | short unsigned int sg_prot_tablesize; |
8ed5a4d2 | 642 | unsigned int max_sectors; |
1da177e4 | 643 | unsigned long dma_boundary; |
efec4b90 BVA |
644 | /* |
645 | * In scsi-mq mode, the number of hardware queues supported by the LLD. | |
646 | * | |
647 | * Note: it is assumed that each hardware queue has a queue depth of | |
648 | * can_queue. In other words, the total queue depth per host | |
649 | * is nr_hw_queues * can_queue. | |
650 | */ | |
651 | unsigned nr_hw_queues; | |
1da177e4 LT |
652 | /* |
653 | * Used to assign serial numbers to the cmds. | |
654 | * Protected by the host lock. | |
655 | */ | |
12a44162 | 656 | unsigned long cmd_serial_number; |
1da177e4 | 657 | |
5dc2b89e | 658 | unsigned active_mode:2; |
1da177e4 LT |
659 | unsigned unchecked_isa_dma:1; |
660 | unsigned use_clustering:1; | |
1da177e4 LT |
661 | |
662 | /* | |
663 | * Host has requested that no further requests come through for the | |
664 | * time being. | |
665 | */ | |
666 | unsigned host_self_blocked:1; | |
667 | ||
668 | /* | |
669 | * Host uses correct SCSI ordering not PC ordering. The bit is | |
670 | * set for the minority of drivers whose authors actually read | |
d850bd34 | 671 | * the spec ;). |
1da177e4 LT |
672 | */ |
673 | unsigned reverse_ordering:1; | |
674 | ||
d850bd34 | 675 | /* Task mgmt function in progress */ |
d7a1bb0a JS |
676 | unsigned tmf_in_progress:1; |
677 | ||
3e082a91 MW |
678 | /* Asynchronous scan in progress */ |
679 | unsigned async_scan:1; | |
680 | ||
ae0751ff LM |
681 | /* Don't resume host in EH */ |
682 | unsigned eh_noresume:1; | |
683 | ||
54b2b50c MP |
684 | /* The controller does not support WRITE SAME */ |
685 | unsigned no_write_same:1; | |
686 | ||
d285203c | 687 | unsigned use_blk_mq:1; |
64bdcbc4 | 688 | unsigned use_cmd_list:1; |
d285203c | 689 | |
1da177e4 LT |
690 | /* |
691 | * Optional work queue to be utilized by the transport | |
692 | */ | |
aab0de24 | 693 | char work_q_name[20]; |
1da177e4 LT |
694 | struct workqueue_struct *work_q; |
695 | ||
e494f6a7 HR |
696 | /* |
697 | * Task management function work queue | |
698 | */ | |
699 | struct workqueue_struct *tmf_work_q; | |
700 | ||
50c4e964 AS |
701 | /* The transport requires the LUN bits NOT to be stored in CDB[1] */ |
702 | unsigned no_scsi2_lun_in_cdb:1; | |
703 | ||
1da177e4 LT |
704 | /* |
705 | * Value host_blocked counts down from | |
706 | */ | |
707 | unsigned int max_host_blocked; | |
708 | ||
4469f987 MP |
709 | /* Protection Information */ |
710 | unsigned int prot_capabilities; | |
711 | unsigned char prot_guard_type; | |
712 | ||
b58d9154 FT |
713 | /* |
714 | * q used for scsi_tgt msgs, async events or any other requests that | |
715 | * need to be processed in userspace | |
716 | */ | |
717 | struct request_queue *uspace_req_q; | |
718 | ||
1da177e4 LT |
719 | /* legacy crap */ |
720 | unsigned long base; | |
721 | unsigned long io_port; | |
722 | unsigned char n_io_port; | |
723 | unsigned char dma_channel; | |
724 | unsigned int irq; | |
725 | ||
726 | ||
d3301874 | 727 | enum scsi_host_state shost_state; |
1da177e4 LT |
728 | |
729 | /* ldm bits */ | |
ee959b00 | 730 | struct device shost_gendev, shost_dev; |
1da177e4 LT |
731 | |
732 | /* | |
733 | * List of hosts per template. | |
734 | * | |
735 | * This is only for use by scsi_module.c for legacy templates. | |
736 | * For these access to it is synchronized implicitly by | |
737 | * module_init/module_exit. | |
738 | */ | |
739 | struct list_head sht_legacy_list; | |
740 | ||
741 | /* | |
742 | * Points to the transport data (if any) which is allocated | |
743 | * separately | |
744 | */ | |
745 | void *shost_data; | |
746 | ||
d139b9bd JB |
747 | /* |
748 | * Points to the physical bus device we'd use to do DMA | |
749 | * Needed just in case we have virtual hosts. | |
750 | */ | |
751 | struct device *dma_dev; | |
752 | ||
1da177e4 LT |
753 | /* |
754 | * We should ensure that this is aligned, both for better performance | |
755 | * and also because some compilers (m68k) don't automatically force | |
756 | * alignment to a long boundary. | |
757 | */ | |
758 | unsigned long hostdata[0] /* Used for storage of host specific stuff */ | |
759 | __attribute__ ((aligned (sizeof(unsigned long)))); | |
760 | }; | |
761 | ||
762 | #define class_to_shost(d) \ | |
ee959b00 | 763 | container_of(d, struct Scsi_Host, shost_dev) |
1da177e4 | 764 | |
9ccfc756 JB |
765 | #define shost_printk(prefix, shost, fmt, a...) \ |
766 | dev_printk(prefix, &(shost)->shost_gendev, fmt, ##a) | |
767 | ||
bcd92c9f CH |
768 | static inline void *shost_priv(struct Scsi_Host *shost) |
769 | { | |
770 | return (void *)shost->hostdata; | |
771 | } | |
9ccfc756 | 772 | |
1da177e4 LT |
773 | int scsi_is_host_device(const struct device *); |
774 | ||
775 | static inline struct Scsi_Host *dev_to_shost(struct device *dev) | |
776 | { | |
777 | while (!scsi_is_host_device(dev)) { | |
778 | if (!dev->parent) | |
779 | return NULL; | |
780 | dev = dev->parent; | |
781 | } | |
782 | return container_of(dev, struct Scsi_Host, shost_gendev); | |
783 | } | |
784 | ||
939647ee JB |
785 | static inline int scsi_host_in_recovery(struct Scsi_Host *shost) |
786 | { | |
787 | return shost->shost_state == SHOST_RECOVERY || | |
788 | shost->shost_state == SHOST_CANCEL_RECOVERY || | |
d7a1bb0a JS |
789 | shost->shost_state == SHOST_DEL_RECOVERY || |
790 | shost->tmf_in_progress; | |
939647ee JB |
791 | } |
792 | ||
d285203c CH |
793 | extern bool scsi_use_blk_mq; |
794 | ||
795 | static inline bool shost_use_blk_mq(struct Scsi_Host *shost) | |
796 | { | |
797 | return shost->use_blk_mq; | |
798 | } | |
799 | ||
1da177e4 LT |
800 | extern int scsi_queue_work(struct Scsi_Host *, struct work_struct *); |
801 | extern void scsi_flush_work(struct Scsi_Host *); | |
802 | ||
803 | extern struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *, int); | |
d139b9bd JB |
804 | extern int __must_check scsi_add_host_with_dma(struct Scsi_Host *, |
805 | struct device *, | |
806 | struct device *); | |
1da177e4 | 807 | extern void scsi_scan_host(struct Scsi_Host *); |
1da177e4 LT |
808 | extern void scsi_rescan_device(struct device *); |
809 | extern void scsi_remove_host(struct Scsi_Host *); | |
810 | extern struct Scsi_Host *scsi_host_get(struct Scsi_Host *); | |
811 | extern void scsi_host_put(struct Scsi_Host *t); | |
812 | extern struct Scsi_Host *scsi_host_lookup(unsigned short); | |
d3301874 | 813 | extern const char *scsi_host_state_name(enum scsi_host_state); |
f281233d | 814 | extern void scsi_cmd_get_serial(struct Scsi_Host *, struct scsi_cmnd *); |
1da177e4 | 815 | |
d139b9bd JB |
816 | static inline int __must_check scsi_add_host(struct Scsi_Host *host, |
817 | struct device *dev) | |
818 | { | |
819 | return scsi_add_host_with_dma(host, dev, dev); | |
820 | } | |
821 | ||
1da177e4 LT |
822 | static inline struct device *scsi_get_device(struct Scsi_Host *shost) |
823 | { | |
824 | return shost->shost_gendev.parent; | |
825 | } | |
826 | ||
82f29467 MA |
827 | /** |
828 | * scsi_host_scan_allowed - Is scanning of this host allowed | |
829 | * @shost: Pointer to Scsi_Host. | |
830 | **/ | |
831 | static inline int scsi_host_scan_allowed(struct Scsi_Host *shost) | |
832 | { | |
76e4e12f MC |
833 | return shost->shost_state == SHOST_RUNNING || |
834 | shost->shost_state == SHOST_RECOVERY; | |
82f29467 MA |
835 | } |
836 | ||
1da177e4 LT |
837 | extern void scsi_unblock_requests(struct Scsi_Host *); |
838 | extern void scsi_block_requests(struct Scsi_Host *); | |
839 | ||
840 | struct class_container; | |
b58d9154 FT |
841 | |
842 | extern struct request_queue *__scsi_alloc_queue(struct Scsi_Host *shost, | |
843 | void (*) (struct request_queue *)); | |
1da177e4 LT |
844 | /* |
845 | * These two functions are used to allocate and free a pseudo device | |
846 | * which will connect to the host adapter itself rather than any | |
847 | * physical device. You must deallocate when you are done with the | |
848 | * thing. This physical pseudo-device isn't real and won't be available | |
849 | * from any high-level drivers. | |
850 | */ | |
851 | extern void scsi_free_host_dev(struct scsi_device *); | |
852 | extern struct scsi_device *scsi_get_host_dev(struct Scsi_Host *); | |
853 | ||
4469f987 MP |
854 | /* |
855 | * DIF defines the exchange of protection information between | |
856 | * initiator and SBC block device. | |
857 | * | |
858 | * DIX defines the exchange of protection information between OS and | |
859 | * initiator. | |
860 | */ | |
861 | enum scsi_host_prot_capabilities { | |
862 | SHOST_DIF_TYPE1_PROTECTION = 1 << 0, /* T10 DIF Type 1 */ | |
863 | SHOST_DIF_TYPE2_PROTECTION = 1 << 1, /* T10 DIF Type 2 */ | |
864 | SHOST_DIF_TYPE3_PROTECTION = 1 << 2, /* T10 DIF Type 3 */ | |
865 | ||
866 | SHOST_DIX_TYPE0_PROTECTION = 1 << 3, /* DIX between OS and HBA only */ | |
867 | SHOST_DIX_TYPE1_PROTECTION = 1 << 4, /* DIX with DIF Type 1 */ | |
868 | SHOST_DIX_TYPE2_PROTECTION = 1 << 5, /* DIX with DIF Type 2 */ | |
869 | SHOST_DIX_TYPE3_PROTECTION = 1 << 6, /* DIX with DIF Type 3 */ | |
870 | }; | |
871 | ||
872 | /* | |
873 | * SCSI hosts which support the Data Integrity Extensions must | |
874 | * indicate their capabilities by setting the prot_capabilities using | |
875 | * this call. | |
876 | */ | |
877 | static inline void scsi_host_set_prot(struct Scsi_Host *shost, unsigned int mask) | |
878 | { | |
879 | shost->prot_capabilities = mask; | |
880 | } | |
881 | ||
882 | static inline unsigned int scsi_host_get_prot(struct Scsi_Host *shost) | |
883 | { | |
884 | return shost->prot_capabilities; | |
885 | } | |
886 | ||
13f05c8d MP |
887 | static inline int scsi_host_prot_dma(struct Scsi_Host *shost) |
888 | { | |
889 | return shost->prot_capabilities >= SHOST_DIX_TYPE0_PROTECTION; | |
890 | } | |
891 | ||
4469f987 MP |
892 | static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type) |
893 | { | |
b2b465e9 MP |
894 | static unsigned char cap[] = { 0, |
895 | SHOST_DIF_TYPE1_PROTECTION, | |
896 | SHOST_DIF_TYPE2_PROTECTION, | |
897 | SHOST_DIF_TYPE3_PROTECTION }; | |
4469f987 | 898 | |
4d24834d | 899 | if (target_type >= ARRAY_SIZE(cap)) |
fe542396 MP |
900 | return 0; |
901 | ||
b2b465e9 | 902 | return shost->prot_capabilities & cap[target_type] ? target_type : 0; |
4469f987 MP |
903 | } |
904 | ||
905 | static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type) | |
906 | { | |
35e1a5d9 | 907 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
b2b465e9 MP |
908 | static unsigned char cap[] = { SHOST_DIX_TYPE0_PROTECTION, |
909 | SHOST_DIX_TYPE1_PROTECTION, | |
910 | SHOST_DIX_TYPE2_PROTECTION, | |
911 | SHOST_DIX_TYPE3_PROTECTION }; | |
912 | ||
4d24834d | 913 | if (target_type >= ARRAY_SIZE(cap)) |
fe542396 MP |
914 | return 0; |
915 | ||
b2b465e9 | 916 | return shost->prot_capabilities & cap[target_type]; |
35e1a5d9 | 917 | #endif |
4469f987 MP |
918 | return 0; |
919 | } | |
920 | ||
921 | /* | |
922 | * All DIX-capable initiators must support the T10-mandated CRC | |
923 | * checksum. Controllers can optionally implement the IP checksum | |
924 | * scheme which has much lower impact on system performance. Note | |
925 | * that the main rationale for the checksum is to match integrity | |
926 | * metadata with data. Detecting bit errors are a job for ECC memory | |
927 | * and buses. | |
928 | */ | |
929 | ||
930 | enum scsi_host_guard_type { | |
931 | SHOST_DIX_GUARD_CRC = 1 << 0, | |
932 | SHOST_DIX_GUARD_IP = 1 << 1, | |
933 | }; | |
934 | ||
935 | static inline void scsi_host_set_guard(struct Scsi_Host *shost, unsigned char type) | |
936 | { | |
937 | shost->prot_guard_type = type; | |
938 | } | |
939 | ||
940 | static inline unsigned char scsi_host_get_guard(struct Scsi_Host *shost) | |
941 | { | |
942 | return shost->prot_guard_type; | |
943 | } | |
944 | ||
1da177e4 LT |
945 | /* legacy interfaces */ |
946 | extern struct Scsi_Host *scsi_register(struct scsi_host_template *, int); | |
947 | extern void scsi_unregister(struct Scsi_Host *); | |
47ba39ee | 948 | extern int scsi_host_set_state(struct Scsi_Host *, enum scsi_host_state); |
1da177e4 LT |
949 | |
950 | #endif /* _SCSI_SCSI_HOST_H */ |