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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
320ae51f JA |
2 | #ifndef BLK_MQ_H |
3 | #define BLK_MQ_H | |
4 | ||
5 | #include <linux/blkdev.h> | |
88459642 | 6 | #include <linux/sbitmap.h> |
fb01a293 | 7 | #include <linux/lockdep.h> |
24b83deb | 8 | #include <linux/scatterlist.h> |
e028f167 | 9 | #include <linux/prefetch.h> |
80bd4a7a | 10 | #include <linux/srcu.h> |
320ae51f JA |
11 | |
12 | struct blk_mq_tags; | |
f70ced09 | 13 | struct blk_flush_queue; |
320ae51f | 14 | |
24b83deb | 15 | #define BLKDEV_MIN_RQ 4 |
d2a27964 | 16 | #define BLKDEV_DEFAULT_RQ 128 |
24b83deb | 17 | |
de671d61 JA |
18 | enum rq_end_io_ret { |
19 | RQ_END_IO_NONE, | |
20 | RQ_END_IO_FREE, | |
21 | }; | |
22 | ||
23 | typedef enum rq_end_io_ret (rq_end_io_fn)(struct request *, blk_status_t); | |
24b83deb CH |
24 | |
25 | /* | |
26 | * request flags */ | |
27 | typedef __u32 __bitwise req_flags_t; | |
28 | ||
29 | /* drive already may have started this one */ | |
30 | #define RQF_STARTED ((__force req_flags_t)(1 << 1)) | |
31 | /* may not be passed by ioscheduler */ | |
32 | #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) | |
33 | /* request for flush sequence */ | |
34 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) | |
35 | /* merge of different types, fail separately */ | |
36 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) | |
37 | /* track inflight for MQ */ | |
38 | #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) | |
39 | /* don't call prep for this one */ | |
40 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) | |
41 | /* vaguely specified driver internal error. Ignored by the block layer */ | |
42 | #define RQF_FAILED ((__force req_flags_t)(1 << 10)) | |
43 | /* don't warn about errors */ | |
44 | #define RQF_QUIET ((__force req_flags_t)(1 << 11)) | |
45 | /* elevator private data attached */ | |
46 | #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) | |
47 | /* account into disk and partition IO statistics */ | |
48 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) | |
49 | /* runtime pm request */ | |
50 | #define RQF_PM ((__force req_flags_t)(1 << 15)) | |
51 | /* on IO scheduler merge hash */ | |
52 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) | |
53 | /* track IO completion time */ | |
54 | #define RQF_STATS ((__force req_flags_t)(1 << 17)) | |
55 | /* Look at ->special_vec for the actual data payload instead of the | |
56 | bio chain. */ | |
57 | #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) | |
58 | /* The per-zone write lock is held for this request */ | |
59 | #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) | |
60 | /* already slept for hybrid poll */ | |
61 | #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) | |
62 | /* ->timeout has been called, don't expire again */ | |
63 | #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) | |
2ff0682d JA |
64 | /* queue has elevator attached */ |
65 | #define RQF_ELV ((__force req_flags_t)(1 << 22)) | |
99e48cd6 | 66 | #define RQF_RESV ((__force req_flags_t)(1 << 23)) |
24b83deb CH |
67 | |
68 | /* flags that prevent us from merging requests: */ | |
69 | #define RQF_NOMERGE_FLAGS \ | |
70 | (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) | |
71 | ||
72 | enum mq_rq_state { | |
73 | MQ_RQ_IDLE = 0, | |
74 | MQ_RQ_IN_FLIGHT = 1, | |
75 | MQ_RQ_COMPLETE = 2, | |
76 | }; | |
77 | ||
78 | /* | |
79 | * Try to put the fields that are referenced together in the same cacheline. | |
80 | * | |
81 | * If you modify this structure, make sure to update blk_rq_init() and | |
82 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
83 | */ | |
84 | struct request { | |
85 | struct request_queue *q; | |
86 | struct blk_mq_ctx *mq_ctx; | |
87 | struct blk_mq_hw_ctx *mq_hctx; | |
88 | ||
16458cf3 | 89 | blk_opf_t cmd_flags; /* op and common flags */ |
24b83deb CH |
90 | req_flags_t rq_flags; |
91 | ||
92 | int tag; | |
93 | int internal_tag; | |
94 | ||
b6087629 JA |
95 | unsigned int timeout; |
96 | ||
24b83deb CH |
97 | /* the following two fields are internal, NEVER access directly */ |
98 | unsigned int __data_len; /* total data len */ | |
99 | sector_t __sector; /* sector cursor */ | |
100 | ||
101 | struct bio *bio; | |
102 | struct bio *biotail; | |
103 | ||
47c122e3 JA |
104 | union { |
105 | struct list_head queuelist; | |
106 | struct request *rq_next; | |
107 | }; | |
24b83deb | 108 | |
24b83deb CH |
109 | struct block_device *part; |
110 | #ifdef CONFIG_BLK_RQ_ALLOC_TIME | |
111 | /* Time that the first bio started allocating this request. */ | |
112 | u64 alloc_time_ns; | |
113 | #endif | |
114 | /* Time that this request was allocated for this IO. */ | |
115 | u64 start_time_ns; | |
116 | /* Time that I/O was submitted to the device. */ | |
117 | u64 io_start_time_ns; | |
118 | ||
119 | #ifdef CONFIG_BLK_WBT | |
120 | unsigned short wbt_flags; | |
121 | #endif | |
122 | /* | |
123 | * rq sectors used for blk stats. It has the same value | |
124 | * with blk_rq_sectors(rq), except that it never be zeroed | |
125 | * by completion. | |
126 | */ | |
127 | unsigned short stats_sectors; | |
128 | ||
129 | /* | |
130 | * Number of scatter-gather DMA addr+len pairs after | |
131 | * physical address coalescing is performed. | |
132 | */ | |
133 | unsigned short nr_phys_segments; | |
134 | ||
135 | #ifdef CONFIG_BLK_DEV_INTEGRITY | |
136 | unsigned short nr_integrity_segments; | |
137 | #endif | |
138 | ||
139 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION | |
140 | struct bio_crypt_ctx *crypt_ctx; | |
cb77cb5a | 141 | struct blk_crypto_keyslot *crypt_keyslot; |
24b83deb CH |
142 | #endif |
143 | ||
24b83deb CH |
144 | unsigned short ioprio; |
145 | ||
146 | enum mq_rq_state state; | |
0a467d0f | 147 | atomic_t ref; |
24b83deb | 148 | |
24b83deb CH |
149 | unsigned long deadline; |
150 | ||
b6087629 JA |
151 | /* |
152 | * The hash is used inside the scheduler, and killed once the | |
153 | * request reaches the dispatch list. The ipi_list is only used | |
154 | * to queue the request for softirq completion, which is long | |
155 | * after the request has been unhashed (and even removed from | |
156 | * the dispatch list). | |
157 | */ | |
158 | union { | |
159 | struct hlist_node hash; /* merge hash */ | |
160 | struct llist_node ipi_list; | |
161 | }; | |
162 | ||
163 | /* | |
164 | * The rb_node is only used inside the io scheduler, requests | |
165 | * are pruned when moved to the dispatch queue. So let the | |
166 | * completion_data share space with the rb_node. | |
167 | */ | |
168 | union { | |
169 | struct rb_node rb_node; /* sort/lookup */ | |
170 | struct bio_vec special_vec; | |
171 | void *completion_data; | |
b6087629 JA |
172 | }; |
173 | ||
174 | ||
175 | /* | |
176 | * Three pointers are available for the IO schedulers, if they need | |
177 | * more they have to dynamically allocate it. Flush requests are | |
178 | * never put on the IO scheduler. So let the flush fields share | |
179 | * space with the elevator data. | |
180 | */ | |
181 | union { | |
182 | struct { | |
183 | struct io_cq *icq; | |
184 | void *priv[2]; | |
185 | } elv; | |
186 | ||
187 | struct { | |
188 | unsigned int seq; | |
189 | struct list_head list; | |
190 | rq_end_io_fn *saved_end_io; | |
191 | } flush; | |
192 | }; | |
193 | ||
24b83deb CH |
194 | union { |
195 | struct __call_single_data csd; | |
196 | u64 fifo_time; | |
197 | }; | |
198 | ||
199 | /* | |
200 | * completion callback. | |
201 | */ | |
202 | rq_end_io_fn *end_io; | |
203 | void *end_io_data; | |
204 | }; | |
205 | ||
2d9b02be BVA |
206 | static inline enum req_op req_op(const struct request *req) |
207 | { | |
208 | return req->cmd_flags & REQ_OP_MASK; | |
209 | } | |
24b83deb CH |
210 | |
211 | static inline bool blk_rq_is_passthrough(struct request *rq) | |
212 | { | |
213 | return blk_op_is_passthrough(req_op(rq)); | |
214 | } | |
215 | ||
216 | static inline unsigned short req_get_ioprio(struct request *req) | |
217 | { | |
218 | return req->ioprio; | |
219 | } | |
220 | ||
221 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) | |
222 | ||
223 | #define rq_dma_dir(rq) \ | |
224 | (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) | |
225 | ||
edce22e1 KB |
226 | #define rq_list_add(listptr, rq) do { \ |
227 | (rq)->rq_next = *(listptr); \ | |
228 | *(listptr) = rq; \ | |
229 | } while (0) | |
230 | ||
34e0a279 JK |
231 | #define rq_list_add_tail(lastpptr, rq) do { \ |
232 | (rq)->rq_next = NULL; \ | |
233 | **(lastpptr) = rq; \ | |
234 | *(lastpptr) = &rq->rq_next; \ | |
235 | } while (0) | |
236 | ||
edce22e1 KB |
237 | #define rq_list_pop(listptr) \ |
238 | ({ \ | |
239 | struct request *__req = NULL; \ | |
240 | if ((listptr) && *(listptr)) { \ | |
241 | __req = *(listptr); \ | |
242 | *(listptr) = __req->rq_next; \ | |
243 | } \ | |
244 | __req; \ | |
245 | }) | |
246 | ||
247 | #define rq_list_peek(listptr) \ | |
248 | ({ \ | |
249 | struct request *__req = NULL; \ | |
250 | if ((listptr) && *(listptr)) \ | |
251 | __req = *(listptr); \ | |
252 | __req; \ | |
253 | }) | |
254 | ||
255 | #define rq_list_for_each(listptr, pos) \ | |
256 | for (pos = rq_list_peek((listptr)); pos; pos = rq_list_next(pos)) | |
257 | ||
3764fd05 KB |
258 | #define rq_list_for_each_safe(listptr, pos, nxt) \ |
259 | for (pos = rq_list_peek((listptr)), nxt = rq_list_next(pos); \ | |
260 | pos; pos = nxt, nxt = pos ? rq_list_next(pos) : NULL) | |
261 | ||
edce22e1 KB |
262 | #define rq_list_next(rq) (rq)->rq_next |
263 | #define rq_list_empty(list) ((list) == (struct request *) NULL) | |
264 | ||
d2528be7 KB |
265 | /** |
266 | * rq_list_move() - move a struct request from one list to another | |
267 | * @src: The source list @rq is currently in | |
268 | * @dst: The destination list that @rq will be appended to | |
269 | * @rq: The request to move | |
270 | * @prev: The request preceding @rq in @src (NULL if @rq is the head) | |
271 | */ | |
292c33c9 | 272 | static inline void rq_list_move(struct request **src, struct request **dst, |
d2528be7 KB |
273 | struct request *rq, struct request *prev) |
274 | { | |
275 | if (prev) | |
276 | prev->rq_next = rq->rq_next; | |
277 | else | |
278 | *src = rq->rq_next; | |
279 | rq_list_add(dst, rq); | |
280 | } | |
281 | ||
b2bed51a BVA |
282 | /** |
283 | * enum blk_eh_timer_return - How the timeout handler should proceed | |
284 | * @BLK_EH_DONE: The block driver completed the command or will complete it at | |
285 | * a later time. | |
286 | * @BLK_EH_RESET_TIMER: Reset the request timer and continue waiting for the | |
287 | * request to complete. | |
288 | */ | |
24b83deb | 289 | enum blk_eh_timer_return { |
b2bed51a BVA |
290 | BLK_EH_DONE, |
291 | BLK_EH_RESET_TIMER, | |
24b83deb CH |
292 | }; |
293 | ||
294 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ | |
295 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
296 | ||
fe644072 | 297 | /** |
d386732b AA |
298 | * struct blk_mq_hw_ctx - State for a hardware queue facing the hardware |
299 | * block device | |
fe644072 | 300 | */ |
320ae51f JA |
301 | struct blk_mq_hw_ctx { |
302 | struct { | |
d386732b | 303 | /** @lock: Protects the dispatch list. */ |
320ae51f | 304 | spinlock_t lock; |
d386732b AA |
305 | /** |
306 | * @dispatch: Used for requests that are ready to be | |
307 | * dispatched to the hardware but for some reason (e.g. lack of | |
308 | * resources) could not be sent to the hardware. As soon as the | |
309 | * driver can send new requests, requests at this list will | |
310 | * be sent first for a fairer dispatch. | |
311 | */ | |
320ae51f | 312 | struct list_head dispatch; |
d386732b AA |
313 | /** |
314 | * @state: BLK_MQ_S_* flags. Defines the state of the hw | |
315 | * queue (active, scheduled to restart, stopped). | |
316 | */ | |
317 | unsigned long state; | |
320ae51f JA |
318 | } ____cacheline_aligned_in_smp; |
319 | ||
d386732b AA |
320 | /** |
321 | * @run_work: Used for scheduling a hardware queue run at a later time. | |
322 | */ | |
9f993737 | 323 | struct delayed_work run_work; |
d386732b | 324 | /** @cpumask: Map of available CPUs where this hctx can run. */ |
e4043dcf | 325 | cpumask_var_t cpumask; |
d386732b AA |
326 | /** |
327 | * @next_cpu: Used by blk_mq_hctx_next_cpu() for round-robin CPU | |
328 | * selection from @cpumask. | |
329 | */ | |
506e931f | 330 | int next_cpu; |
d386732b AA |
331 | /** |
332 | * @next_cpu_batch: Counter of how many works left in the batch before | |
333 | * changing to the next CPU. | |
334 | */ | |
506e931f | 335 | int next_cpu_batch; |
320ae51f | 336 | |
d386732b AA |
337 | /** @flags: BLK_MQ_F_* flags. Defines the behaviour of the queue. */ |
338 | unsigned long flags; | |
320ae51f | 339 | |
d386732b AA |
340 | /** |
341 | * @sched_data: Pointer owned by the IO scheduler attached to a request | |
342 | * queue. It's up to the IO scheduler how to use this pointer. | |
343 | */ | |
bd166ef1 | 344 | void *sched_data; |
d386732b AA |
345 | /** |
346 | * @queue: Pointer to the request queue that owns this hardware context. | |
347 | */ | |
320ae51f | 348 | struct request_queue *queue; |
d386732b | 349 | /** @fq: Queue of requests that need to perform a flush operation. */ |
f70ced09 | 350 | struct blk_flush_queue *fq; |
320ae51f | 351 | |
d386732b AA |
352 | /** |
353 | * @driver_data: Pointer to data owned by the block driver that created | |
354 | * this hctx | |
355 | */ | |
320ae51f JA |
356 | void *driver_data; |
357 | ||
d386732b AA |
358 | /** |
359 | * @ctx_map: Bitmap for each software queue. If bit is on, there is a | |
360 | * pending request in that software queue. | |
361 | */ | |
88459642 | 362 | struct sbitmap ctx_map; |
1429d7c9 | 363 | |
d386732b AA |
364 | /** |
365 | * @dispatch_from: Software queue to be used when no scheduler was | |
366 | * selected. | |
367 | */ | |
b347689f | 368 | struct blk_mq_ctx *dispatch_from; |
d386732b AA |
369 | /** |
370 | * @dispatch_busy: Number used by blk_mq_update_dispatch_busy() to | |
371 | * decide if the hw_queue is busy using Exponential Weighted Moving | |
372 | * Average algorithm. | |
373 | */ | |
6e768717 | 374 | unsigned int dispatch_busy; |
b347689f | 375 | |
d386732b | 376 | /** @type: HCTX_TYPE_* flags. Type of hardware queue. */ |
f31967f0 | 377 | unsigned short type; |
d386732b | 378 | /** @nr_ctx: Number of software queues. */ |
f31967f0 | 379 | unsigned short nr_ctx; |
d386732b | 380 | /** @ctxs: Array of software queues. */ |
6e768717 | 381 | struct blk_mq_ctx **ctxs; |
4bb659b1 | 382 | |
d386732b | 383 | /** @dispatch_wait_lock: Lock for dispatch_wait queue. */ |
5815839b | 384 | spinlock_t dispatch_wait_lock; |
d386732b AA |
385 | /** |
386 | * @dispatch_wait: Waitqueue to put requests when there is no tag | |
387 | * available at the moment, to wait for another try in the future. | |
388 | */ | |
eb619fdb | 389 | wait_queue_entry_t dispatch_wait; |
d386732b AA |
390 | |
391 | /** | |
392 | * @wait_index: Index of next available dispatch_wait queue to insert | |
393 | * requests. | |
394 | */ | |
8537b120 | 395 | atomic_t wait_index; |
320ae51f | 396 | |
d386732b AA |
397 | /** |
398 | * @tags: Tags owned by the block driver. A tag at this set is only | |
399 | * assigned when a request is dispatched from a hardware queue. | |
400 | */ | |
320ae51f | 401 | struct blk_mq_tags *tags; |
d386732b AA |
402 | /** |
403 | * @sched_tags: Tags owned by I/O scheduler. If there is an I/O | |
404 | * scheduler associated with a request queue, a tag is assigned when | |
405 | * that request is allocated. Else, this member is not used. | |
406 | */ | |
bd166ef1 | 407 | struct blk_mq_tags *sched_tags; |
320ae51f | 408 | |
d386732b | 409 | /** @queued: Number of queued requests. */ |
320ae51f | 410 | unsigned long queued; |
d386732b | 411 | /** @run: Number of dispatched requests. */ |
320ae51f | 412 | unsigned long run; |
320ae51f | 413 | |
d386732b | 414 | /** @numa_node: NUMA node the storage adapter has been connected to. */ |
320ae51f | 415 | unsigned int numa_node; |
d386732b | 416 | /** @queue_num: Index of this hardware queue. */ |
17ded320 | 417 | unsigned int queue_num; |
320ae51f | 418 | |
d386732b AA |
419 | /** |
420 | * @nr_active: Number of active requests. Only used when a tag set is | |
421 | * shared across request queues. | |
422 | */ | |
0d2602ca JA |
423 | atomic_t nr_active; |
424 | ||
bf0beec0 ML |
425 | /** @cpuhp_online: List to store request if CPU is going to die */ |
426 | struct hlist_node cpuhp_online; | |
d386732b | 427 | /** @cpuhp_dead: List to store request if some CPU die. */ |
9467f859 | 428 | struct hlist_node cpuhp_dead; |
d386732b | 429 | /** @kobj: Kernel object for sysfs. */ |
320ae51f | 430 | struct kobject kobj; |
05229bee | 431 | |
9c1051aa | 432 | #ifdef CONFIG_BLK_DEBUG_FS |
d386732b AA |
433 | /** |
434 | * @debugfs_dir: debugfs directory for this hardware queue. Named | |
435 | * as cpu<cpu_number>. | |
436 | */ | |
9c1051aa | 437 | struct dentry *debugfs_dir; |
d386732b | 438 | /** @sched_debugfs_dir: debugfs directory for the scheduler. */ |
d332ce09 | 439 | struct dentry *sched_debugfs_dir; |
9c1051aa | 440 | #endif |
07319678 | 441 | |
2dd209f0 BVA |
442 | /** |
443 | * @hctx_list: if this hctx is not in use, this is an entry in | |
444 | * q->unused_hctx_list. | |
445 | */ | |
2f8f1336 | 446 | struct list_head hctx_list; |
320ae51f JA |
447 | }; |
448 | ||
7a18312c | 449 | /** |
d386732b | 450 | * struct blk_mq_queue_map - Map software queues to hardware queues |
7a18312c BVA |
451 | * @mq_map: CPU ID to hardware queue index map. This is an array |
452 | * with nr_cpu_ids elements. Each element has a value in the range | |
453 | * [@queue_offset, @queue_offset + @nr_queues). | |
454 | * @nr_queues: Number of hardware queues to map CPU IDs onto. | |
455 | * @queue_offset: First hardware queue to map onto. Used by the PCIe NVMe | |
456 | * driver to map each hardware queue type (enum hctx_type) onto a distinct | |
457 | * set of hardware queues. | |
458 | */ | |
ed76e329 JA |
459 | struct blk_mq_queue_map { |
460 | unsigned int *mq_map; | |
461 | unsigned int nr_queues; | |
843477d4 | 462 | unsigned int queue_offset; |
ed76e329 JA |
463 | }; |
464 | ||
d386732b AA |
465 | /** |
466 | * enum hctx_type - Type of hardware queue | |
467 | * @HCTX_TYPE_DEFAULT: All I/O not otherwise accounted for. | |
468 | * @HCTX_TYPE_READ: Just for READ I/O. | |
469 | * @HCTX_TYPE_POLL: Polled I/O of any kind. | |
470 | * @HCTX_MAX_TYPES: Number of types of hctx. | |
471 | */ | |
e20ba6e1 | 472 | enum hctx_type { |
d386732b AA |
473 | HCTX_TYPE_DEFAULT, |
474 | HCTX_TYPE_READ, | |
475 | HCTX_TYPE_POLL, | |
e20ba6e1 CH |
476 | |
477 | HCTX_MAX_TYPES, | |
ed76e329 JA |
478 | }; |
479 | ||
7a18312c BVA |
480 | /** |
481 | * struct blk_mq_tag_set - tag set that can be shared between request queues | |
d88cbbb3 | 482 | * @ops: Pointers to functions that implement block driver behavior. |
7a18312c BVA |
483 | * @map: One or more ctx -> hctx mappings. One map exists for each |
484 | * hardware queue type (enum hctx_type) that the driver wishes | |
485 | * to support. There are no restrictions on maps being of the | |
486 | * same size, and it's perfectly legal to share maps between | |
487 | * types. | |
488 | * @nr_maps: Number of elements in the @map array. A number in the range | |
489 | * [1, HCTX_MAX_TYPES]. | |
7a18312c BVA |
490 | * @nr_hw_queues: Number of hardware queues supported by the block driver that |
491 | * owns this data structure. | |
492 | * @queue_depth: Number of tags per hardware queue, reserved tags included. | |
493 | * @reserved_tags: Number of tags to set aside for BLK_MQ_REQ_RESERVED tag | |
494 | * allocations. | |
495 | * @cmd_size: Number of additional bytes to allocate per request. The block | |
496 | * driver owns these additional bytes. | |
497 | * @numa_node: NUMA node the storage adapter has been connected to. | |
498 | * @timeout: Request processing timeout in jiffies. | |
499 | * @flags: Zero or more BLK_MQ_F_* flags. | |
500 | * @driver_data: Pointer to data owned by the block driver that created this | |
501 | * tag set. | |
502 | * @tags: Tag sets. One tag set per hardware queue. Has @nr_hw_queues | |
503 | * elements. | |
079a2e3e JG |
504 | * @shared_tags: |
505 | * Shared set of tags. Has @nr_hw_queues elements. If set, | |
506 | * shared by all @tags. | |
7a18312c BVA |
507 | * @tag_list_lock: Serializes tag_list accesses. |
508 | * @tag_list: List of the request queues that use this tag set. See also | |
509 | * request_queue.tag_set_list. | |
80bd4a7a CH |
510 | * @srcu: Use as lock when type of the request queue is blocking |
511 | * (BLK_MQ_F_BLOCKING). | |
7a18312c | 512 | */ |
24d2f903 | 513 | struct blk_mq_tag_set { |
d88cbbb3 | 514 | const struct blk_mq_ops *ops; |
ed76e329 | 515 | struct blk_mq_queue_map map[HCTX_MAX_TYPES]; |
7a18312c | 516 | unsigned int nr_maps; |
7a18312c BVA |
517 | unsigned int nr_hw_queues; |
518 | unsigned int queue_depth; | |
320ae51f | 519 | unsigned int reserved_tags; |
7a18312c | 520 | unsigned int cmd_size; |
320ae51f JA |
521 | int numa_node; |
522 | unsigned int timeout; | |
7a18312c | 523 | unsigned int flags; |
24d2f903 CH |
524 | void *driver_data; |
525 | ||
526 | struct blk_mq_tags **tags; | |
0d2602ca | 527 | |
079a2e3e | 528 | struct blk_mq_tags *shared_tags; |
e155b0c2 | 529 | |
0d2602ca JA |
530 | struct mutex tag_list_lock; |
531 | struct list_head tag_list; | |
80bd4a7a | 532 | struct srcu_struct *srcu; |
320ae51f JA |
533 | }; |
534 | ||
d386732b AA |
535 | /** |
536 | * struct blk_mq_queue_data - Data about a request inserted in a queue | |
537 | * | |
538 | * @rq: Request pointer. | |
539 | * @last: If it is the last request in the queue. | |
540 | */ | |
74c45052 JA |
541 | struct blk_mq_queue_data { |
542 | struct request *rq; | |
74c45052 JA |
543 | bool last; |
544 | }; | |
545 | ||
2dd6532e | 546 | typedef bool (busy_tag_iter_fn)(struct request *, void *); |
05229bee | 547 | |
d386732b AA |
548 | /** |
549 | * struct blk_mq_ops - Callback functions that implements block driver | |
550 | * behaviour. | |
551 | */ | |
320ae51f | 552 | struct blk_mq_ops { |
d386732b AA |
553 | /** |
554 | * @queue_rq: Queue a new request from block IO. | |
320ae51f | 555 | */ |
0516c2f6 DW |
556 | blk_status_t (*queue_rq)(struct blk_mq_hw_ctx *, |
557 | const struct blk_mq_queue_data *); | |
320ae51f | 558 | |
d386732b AA |
559 | /** |
560 | * @commit_rqs: If a driver uses bd->last to judge when to submit | |
561 | * requests to hardware, it must define this function. In case of errors | |
562 | * that make us stop issuing further requests, this hook serves the | |
d666ba98 JA |
563 | * purpose of kicking the hardware (which the last request otherwise |
564 | * would have done). | |
565 | */ | |
0516c2f6 | 566 | void (*commit_rqs)(struct blk_mq_hw_ctx *); |
d666ba98 | 567 | |
3c67d44d JA |
568 | /** |
569 | * @queue_rqs: Queue a list of new requests. Driver is guaranteed | |
570 | * that each request belongs to the same queue. If the driver doesn't | |
571 | * empty the @rqlist completely, then the rest will be queued | |
572 | * individually by the block layer upon return. | |
573 | */ | |
574 | void (*queue_rqs)(struct request **rqlist); | |
575 | ||
d386732b AA |
576 | /** |
577 | * @get_budget: Reserve budget before queue request, once .queue_rq is | |
de148297 ML |
578 | * run, it is driver's responsibility to release the |
579 | * reserved budget. Also we have to handle failure case | |
580 | * of .get_budget for avoiding I/O deadlock. | |
581 | */ | |
2a5a24aa | 582 | int (*get_budget)(struct request_queue *); |
0516c2f6 | 583 | |
d386732b AA |
584 | /** |
585 | * @put_budget: Release the reserved budget. | |
586 | */ | |
2a5a24aa | 587 | void (*put_budget)(struct request_queue *, int); |
de148297 | 588 | |
85367040 ML |
589 | /** |
590 | * @set_rq_budget_token: store rq's budget token | |
d022d18c ML |
591 | */ |
592 | void (*set_rq_budget_token)(struct request *, int); | |
85367040 ML |
593 | /** |
594 | * @get_rq_budget_token: retrieve rq's budget token | |
d022d18c ML |
595 | */ |
596 | int (*get_rq_budget_token)(struct request *); | |
597 | ||
d386732b AA |
598 | /** |
599 | * @timeout: Called on request timeout. | |
320ae51f | 600 | */ |
9bdb4833 | 601 | enum blk_eh_timer_return (*timeout)(struct request *); |
320ae51f | 602 | |
d386732b AA |
603 | /** |
604 | * @poll: Called to poll for completion of a specific tag. | |
05229bee | 605 | */ |
5a72e899 | 606 | int (*poll)(struct blk_mq_hw_ctx *, struct io_comp_batch *); |
05229bee | 607 | |
d386732b AA |
608 | /** |
609 | * @complete: Mark the request as complete. | |
610 | */ | |
0516c2f6 | 611 | void (*complete)(struct request *); |
30a91cb4 | 612 | |
d386732b AA |
613 | /** |
614 | * @init_hctx: Called when the block layer side of a hardware queue has | |
615 | * been set up, allowing the driver to allocate/init matching | |
616 | * structures. | |
320ae51f | 617 | */ |
0516c2f6 | 618 | int (*init_hctx)(struct blk_mq_hw_ctx *, void *, unsigned int); |
d386732b AA |
619 | /** |
620 | * @exit_hctx: Ditto for exit/teardown. | |
621 | */ | |
0516c2f6 | 622 | void (*exit_hctx)(struct blk_mq_hw_ctx *, unsigned int); |
e9b267d9 | 623 | |
d386732b AA |
624 | /** |
625 | * @init_request: Called for every command allocated by the block layer | |
626 | * to allow the driver to set up driver specific data. | |
f70ced09 ML |
627 | * |
628 | * Tag greater than or equal to queue_depth is for setting up | |
629 | * flush request. | |
e9b267d9 | 630 | */ |
0516c2f6 DW |
631 | int (*init_request)(struct blk_mq_tag_set *set, struct request *, |
632 | unsigned int, unsigned int); | |
d386732b AA |
633 | /** |
634 | * @exit_request: Ditto for exit/teardown. | |
635 | */ | |
0516c2f6 DW |
636 | void (*exit_request)(struct blk_mq_tag_set *set, struct request *, |
637 | unsigned int); | |
d386732b | 638 | |
d386732b AA |
639 | /** |
640 | * @cleanup_rq: Called before freeing one request which isn't completed | |
641 | * yet, and usually for freeing the driver private data. | |
226b4fc7 | 642 | */ |
0516c2f6 | 643 | void (*cleanup_rq)(struct request *); |
226b4fc7 | 644 | |
d386732b AA |
645 | /** |
646 | * @busy: If set, returns whether or not this queue currently is busy. | |
9ba20527 | 647 | */ |
0516c2f6 | 648 | bool (*busy)(struct request_queue *); |
9ba20527 | 649 | |
d386732b AA |
650 | /** |
651 | * @map_queues: This allows drivers specify their own queue mapping by | |
652 | * overriding the setup-time function that builds the mq_map. | |
653 | */ | |
a4e1d0b7 | 654 | void (*map_queues)(struct blk_mq_tag_set *set); |
2836ee4b BVA |
655 | |
656 | #ifdef CONFIG_BLK_DEBUG_FS | |
d386732b AA |
657 | /** |
658 | * @show_rq: Used by the debugfs implementation to show driver-specific | |
2836ee4b BVA |
659 | * information about a request. |
660 | */ | |
661 | void (*show_rq)(struct seq_file *m, struct request *rq); | |
662 | #endif | |
320ae51f JA |
663 | }; |
664 | ||
665 | enum { | |
320ae51f | 666 | BLK_MQ_F_SHOULD_MERGE = 1 << 0, |
51db1c37 | 667 | BLK_MQ_F_TAG_QUEUE_SHARED = 1 << 1, |
bf0beec0 ML |
668 | /* |
669 | * Set when this device requires underlying blk-mq device for | |
670 | * completing IO: | |
671 | */ | |
672 | BLK_MQ_F_STACKING = 1 << 2, | |
32bc15af | 673 | BLK_MQ_F_TAG_HCTX_SHARED = 1 << 3, |
1b792f2f | 674 | BLK_MQ_F_BLOCKING = 1 << 5, |
90b71980 | 675 | /* Do not allow an I/O scheduler to be configured. */ |
d3484991 | 676 | BLK_MQ_F_NO_SCHED = 1 << 6, |
90b71980 BVA |
677 | /* |
678 | * Select 'none' during queue registration in case of a single hwq | |
679 | * or shared hwqs instead of 'mq-deadline'. | |
680 | */ | |
681 | BLK_MQ_F_NO_SCHED_BY_DEFAULT = 1 << 7, | |
24391c0d SL |
682 | BLK_MQ_F_ALLOC_POLICY_START_BIT = 8, |
683 | BLK_MQ_F_ALLOC_POLICY_BITS = 1, | |
320ae51f | 684 | |
5d12f905 | 685 | BLK_MQ_S_STOPPED = 0, |
0d2602ca | 686 | BLK_MQ_S_TAG_ACTIVE = 1, |
bd166ef1 | 687 | BLK_MQ_S_SCHED_RESTART = 2, |
320ae51f | 688 | |
bf0beec0 ML |
689 | /* hw queue is inactive after all its CPUs become offline */ |
690 | BLK_MQ_S_INACTIVE = 3, | |
691 | ||
a4391c64 | 692 | BLK_MQ_MAX_DEPTH = 10240, |
506e931f JA |
693 | |
694 | BLK_MQ_CPU_WORK_BATCH = 8, | |
320ae51f | 695 | }; |
24391c0d SL |
696 | #define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \ |
697 | ((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \ | |
698 | ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) | |
699 | #define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \ | |
700 | ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \ | |
701 | << BLK_MQ_F_ALLOC_POLICY_START_BIT) | |
320ae51f | 702 | |
e155b0c2 JG |
703 | #define BLK_MQ_NO_HCTX_IDX (-1U) |
704 | ||
4dcc4874 CH |
705 | struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set, void *queuedata, |
706 | struct lock_class_key *lkclass); | |
b461dfc4 CH |
707 | #define blk_mq_alloc_disk(set, queuedata) \ |
708 | ({ \ | |
709 | static struct lock_class_key __key; \ | |
b461dfc4 | 710 | \ |
4dcc4874 | 711 | __blk_mq_alloc_disk(set, queuedata, &__key); \ |
b461dfc4 | 712 | }) |
6f8191fd CH |
713 | struct gendisk *blk_mq_alloc_disk_for_queue(struct request_queue *q, |
714 | struct lock_class_key *lkclass); | |
24d2f903 | 715 | struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *); |
26a9750a CH |
716 | int blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, |
717 | struct request_queue *q); | |
6f8191fd | 718 | void blk_mq_destroy_queue(struct request_queue *); |
320ae51f | 719 | |
24d2f903 | 720 | int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set); |
cdb14e0f CH |
721 | int blk_mq_alloc_sq_tag_set(struct blk_mq_tag_set *set, |
722 | const struct blk_mq_ops *ops, unsigned int queue_depth, | |
723 | unsigned int set_flags); | |
24d2f903 CH |
724 | void blk_mq_free_tag_set(struct blk_mq_tag_set *set); |
725 | ||
320ae51f | 726 | void blk_mq_free_request(struct request *rq); |
6f3b0e8b | 727 | |
3c94d83c | 728 | bool blk_mq_queue_inflight(struct request_queue *q); |
ae879912 | 729 | |
6f3b0e8b | 730 | enum { |
9a95e4ef BVA |
731 | /* return when out of requests */ |
732 | BLK_MQ_REQ_NOWAIT = (__force blk_mq_req_flags_t)(1 << 0), | |
733 | /* allocate from reserved pool */ | |
734 | BLK_MQ_REQ_RESERVED = (__force blk_mq_req_flags_t)(1 << 1), | |
0854bcdc BVA |
735 | /* set RQF_PM */ |
736 | BLK_MQ_REQ_PM = (__force blk_mq_req_flags_t)(1 << 2), | |
6f3b0e8b CH |
737 | }; |
738 | ||
16458cf3 | 739 | struct request *blk_mq_alloc_request(struct request_queue *q, blk_opf_t opf, |
9a95e4ef | 740 | blk_mq_req_flags_t flags); |
cd6ce148 | 741 | struct request *blk_mq_alloc_request_hctx(struct request_queue *q, |
16458cf3 | 742 | blk_opf_t opf, blk_mq_req_flags_t flags, |
9a95e4ef | 743 | unsigned int hctx_idx); |
e028f167 JA |
744 | |
745 | /* | |
746 | * Tag address space map. | |
747 | */ | |
748 | struct blk_mq_tags { | |
749 | unsigned int nr_tags; | |
750 | unsigned int nr_reserved_tags; | |
751 | ||
752 | atomic_t active_queues; | |
753 | ||
754 | struct sbitmap_queue bitmap_tags; | |
755 | struct sbitmap_queue breserved_tags; | |
756 | ||
757 | struct request **rqs; | |
758 | struct request **static_rqs; | |
759 | struct list_head page_list; | |
760 | ||
761 | /* | |
762 | * used to clear request reference in rqs[] before freeing one | |
763 | * request pool | |
764 | */ | |
765 | spinlock_t lock; | |
766 | }; | |
767 | ||
768 | static inline struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, | |
769 | unsigned int tag) | |
770 | { | |
771 | if (tag < tags->nr_tags) { | |
772 | prefetch(tags->rqs[tag]); | |
773 | return tags->rqs[tag]; | |
774 | } | |
775 | ||
776 | return NULL; | |
777 | } | |
320ae51f | 778 | |
205fb5f5 BVA |
779 | enum { |
780 | BLK_MQ_UNIQUE_TAG_BITS = 16, | |
781 | BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1, | |
782 | }; | |
783 | ||
784 | u32 blk_mq_unique_tag(struct request *rq); | |
785 | ||
786 | static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag) | |
787 | { | |
788 | return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS; | |
789 | } | |
790 | ||
791 | static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag) | |
792 | { | |
793 | return unique_tag & BLK_MQ_UNIQUE_TAG_MASK; | |
794 | } | |
795 | ||
27a46989 PB |
796 | /** |
797 | * blk_mq_rq_state() - read the current MQ_RQ_* state of a request | |
798 | * @rq: target request. | |
799 | */ | |
800 | static inline enum mq_rq_state blk_mq_rq_state(struct request *rq) | |
801 | { | |
802 | return READ_ONCE(rq->state); | |
803 | } | |
804 | ||
805 | static inline int blk_mq_request_started(struct request *rq) | |
806 | { | |
807 | return blk_mq_rq_state(rq) != MQ_RQ_IDLE; | |
808 | } | |
809 | ||
810 | static inline int blk_mq_request_completed(struct request *rq) | |
811 | { | |
812 | return blk_mq_rq_state(rq) == MQ_RQ_COMPLETE; | |
813 | } | |
320ae51f | 814 | |
83fba8c8 CL |
815 | /* |
816 | * | |
817 | * Set the state to complete when completing a request from inside ->queue_rq. | |
818 | * This is used by drivers that want to ensure special complete actions that | |
819 | * need access to the request are called on failure, e.g. by nvme for | |
820 | * multipathing. | |
821 | */ | |
822 | static inline void blk_mq_set_request_complete(struct request *rq) | |
823 | { | |
824 | WRITE_ONCE(rq->state, MQ_RQ_COMPLETE); | |
825 | } | |
826 | ||
e8dc17e2 SAS |
827 | /* |
828 | * Complete the request directly instead of deferring it to softirq or | |
829 | * completing it another CPU. Useful in preemptible instead of an interrupt. | |
830 | */ | |
831 | static inline void blk_mq_complete_request_direct(struct request *rq, | |
832 | void (*complete)(struct request *rq)) | |
833 | { | |
834 | WRITE_ONCE(rq->state, MQ_RQ_COMPLETE); | |
835 | complete(rq); | |
836 | } | |
837 | ||
e2490073 | 838 | void blk_mq_start_request(struct request *rq); |
2a842aca CH |
839 | void blk_mq_end_request(struct request *rq, blk_status_t error); |
840 | void __blk_mq_end_request(struct request *rq, blk_status_t error); | |
f794f335 JA |
841 | void blk_mq_end_request_batch(struct io_comp_batch *ib); |
842 | ||
843 | /* | |
844 | * Only need start/end time stamping if we have iostat or | |
845 | * blk stats enabled, or using an IO scheduler. | |
846 | */ | |
847 | static inline bool blk_mq_need_time_stamp(struct request *rq) | |
848 | { | |
849 | return (rq->rq_flags & (RQF_IO_STAT | RQF_STATS | RQF_ELV)); | |
850 | } | |
851 | ||
99e48cd6 JG |
852 | static inline bool blk_mq_is_reserved_rq(struct request *rq) |
853 | { | |
854 | return rq->rq_flags & RQF_RESV; | |
855 | } | |
856 | ||
f794f335 JA |
857 | /* |
858 | * Batched completions only work when there is no I/O error and no special | |
859 | * ->end_io handler. | |
860 | */ | |
861 | static inline bool blk_mq_add_to_batch(struct request *req, | |
862 | struct io_comp_batch *iob, int ioerror, | |
863 | void (*complete)(struct io_comp_batch *)) | |
864 | { | |
2d87d455 ML |
865 | if (!iob || (req->rq_flags & RQF_ELV) || ioerror || |
866 | (req->end_io && !blk_rq_is_passthrough(req))) | |
f794f335 | 867 | return false; |
ab3e1d3b | 868 | |
f794f335 JA |
869 | if (!iob->complete) |
870 | iob->complete = complete; | |
871 | else if (iob->complete != complete) | |
872 | return false; | |
873 | iob->need_ts |= blk_mq_need_time_stamp(req); | |
874 | rq_list_add(&iob->req_list, req); | |
875 | return true; | |
876 | } | |
320ae51f | 877 | |
2b053aca | 878 | void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list); |
6fca6a61 | 879 | void blk_mq_kick_requeue_list(struct request_queue *q); |
2849450a | 880 | void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs); |
15f73f5b | 881 | void blk_mq_complete_request(struct request *rq); |
40d09b53 | 882 | bool blk_mq_complete_request_remote(struct request *rq); |
320ae51f JA |
883 | void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx); |
884 | void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx); | |
280d45f6 | 885 | void blk_mq_stop_hw_queues(struct request_queue *q); |
2f268556 | 886 | void blk_mq_start_hw_queues(struct request_queue *q); |
ae911c5e | 887 | void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); |
1b4a3258 | 888 | void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async); |
97e01209 | 889 | void blk_mq_quiesce_queue(struct request_queue *q); |
483239c7 | 890 | void blk_mq_wait_quiesce_done(struct blk_mq_tag_set *set); |
414dd48e CL |
891 | void blk_mq_quiesce_tagset(struct blk_mq_tag_set *set); |
892 | void blk_mq_unquiesce_tagset(struct blk_mq_tag_set *set); | |
e4e73913 | 893 | void blk_mq_unquiesce_queue(struct request_queue *q); |
7587a5ae | 894 | void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs); |
626fb735 | 895 | void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); |
b94ec296 | 896 | void blk_mq_run_hw_queues(struct request_queue *q, bool async); |
b9151e7b | 897 | void blk_mq_delay_run_hw_queues(struct request_queue *q, unsigned long msecs); |
e0489487 SG |
898 | void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset, |
899 | busy_tag_iter_fn *fn, void *priv); | |
f9934a80 | 900 | void blk_mq_tagset_wait_completed_request(struct blk_mq_tag_set *tagset); |
c761d96b | 901 | void blk_mq_freeze_queue(struct request_queue *q); |
b4c6a028 | 902 | void blk_mq_unfreeze_queue(struct request_queue *q); |
1671d522 | 903 | void blk_freeze_queue_start(struct request_queue *q); |
6bae363e | 904 | void blk_mq_freeze_queue_wait(struct request_queue *q); |
f91328c4 KB |
905 | int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, |
906 | unsigned long timeout); | |
320ae51f | 907 | |
a4e1d0b7 | 908 | void blk_mq_map_queues(struct blk_mq_queue_map *qmap); |
868f2f0b KB |
909 | void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues); |
910 | ||
852ec809 | 911 | void blk_mq_quiesce_queue_nowait(struct request_queue *q); |
4f084b41 | 912 | |
9cf2bab6 JA |
913 | unsigned int blk_mq_rq_cpu(struct request *rq); |
914 | ||
15f73f5b CH |
915 | bool __blk_should_fake_timeout(struct request_queue *q); |
916 | static inline bool blk_should_fake_timeout(struct request_queue *q) | |
917 | { | |
918 | if (IS_ENABLED(CONFIG_FAIL_IO_TIMEOUT) && | |
919 | test_bit(QUEUE_FLAG_FAIL_IO, &q->queue_flags)) | |
920 | return __blk_should_fake_timeout(q); | |
921 | return false; | |
922 | } | |
923 | ||
d386732b AA |
924 | /** |
925 | * blk_mq_rq_from_pdu - cast a PDU to a request | |
926 | * @pdu: the PDU (Protocol Data Unit) to be casted | |
927 | * | |
928 | * Return: request | |
929 | * | |
320ae51f | 930 | * Driver command data is immediately after the request. So subtract request |
d386732b | 931 | * size to get back to the original request. |
320ae51f JA |
932 | */ |
933 | static inline struct request *blk_mq_rq_from_pdu(void *pdu) | |
934 | { | |
935 | return pdu - sizeof(struct request); | |
936 | } | |
d386732b AA |
937 | |
938 | /** | |
939 | * blk_mq_rq_to_pdu - cast a request to a PDU | |
940 | * @rq: the request to be casted | |
941 | * | |
942 | * Return: pointer to the PDU | |
943 | * | |
944 | * Driver command data is immediately after the request. So add request to get | |
945 | * the PDU. | |
946 | */ | |
320ae51f JA |
947 | static inline void *blk_mq_rq_to_pdu(struct request *rq) |
948 | { | |
2963e3f7 | 949 | return rq + 1; |
320ae51f JA |
950 | } |
951 | ||
320ae51f | 952 | #define queue_for_each_hw_ctx(q, hctx, i) \ |
4e5cc99e | 953 | xa_for_each(&(q)->hctx_table, (i), (hctx)) |
320ae51f | 954 | |
320ae51f | 955 | #define hctx_for_each_ctx(hctx, ctx, i) \ |
0d0b7d42 JA |
956 | for ((i) = 0; (i) < (hctx)->nr_ctx && \ |
957 | ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++) | |
320ae51f | 958 | |
226b4fc7 ML |
959 | static inline void blk_mq_cleanup_rq(struct request *rq) |
960 | { | |
961 | if (rq->q->mq_ops->cleanup_rq) | |
962 | rq->q->mq_ops->cleanup_rq(rq); | |
963 | } | |
964 | ||
53ffabfd CK |
965 | static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio, |
966 | unsigned int nr_segs) | |
967 | { | |
968 | rq->nr_phys_segments = nr_segs; | |
969 | rq->__data_len = bio->bi_iter.bi_size; | |
970 | rq->bio = rq->biotail = bio; | |
971 | rq->ioprio = bio_prio(bio); | |
53ffabfd CK |
972 | } |
973 | ||
fb01a293 ML |
974 | void blk_mq_hctx_set_fq_lock_class(struct blk_mq_hw_ctx *hctx, |
975 | struct lock_class_key *key); | |
8cf7961d | 976 | |
24b83deb CH |
977 | static inline bool rq_is_sync(struct request *rq) |
978 | { | |
979 | return op_is_sync(rq->cmd_flags); | |
980 | } | |
981 | ||
982 | void blk_rq_init(struct request_queue *q, struct request *rq); | |
24b83deb CH |
983 | int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
984 | struct bio_set *bs, gfp_t gfp_mask, | |
985 | int (*bio_ctr)(struct bio *, struct bio *, void *), void *data); | |
986 | void blk_rq_unprep_clone(struct request *rq); | |
28db4711 | 987 | blk_status_t blk_insert_cloned_request(struct request *rq); |
24b83deb CH |
988 | |
989 | struct rq_map_data { | |
990 | struct page **pages; | |
24b83deb | 991 | unsigned long offset; |
f5d632d1 JA |
992 | unsigned short page_order; |
993 | unsigned short nr_entries; | |
994 | bool null_mapped; | |
995 | bool from_user; | |
24b83deb CH |
996 | }; |
997 | ||
998 | int blk_rq_map_user(struct request_queue *, struct request *, | |
999 | struct rq_map_data *, void __user *, unsigned long, gfp_t); | |
55765402 AG |
1000 | int blk_rq_map_user_io(struct request *, struct rq_map_data *, |
1001 | void __user *, unsigned long, gfp_t, bool, int, bool, int); | |
24b83deb CH |
1002 | int blk_rq_map_user_iov(struct request_queue *, struct request *, |
1003 | struct rq_map_data *, const struct iov_iter *, gfp_t); | |
1004 | int blk_rq_unmap_user(struct bio *); | |
1005 | int blk_rq_map_kern(struct request_queue *, struct request *, void *, | |
1006 | unsigned int, gfp_t); | |
1007 | int blk_rq_append_bio(struct request *rq, struct bio *bio); | |
e2e53086 | 1008 | void blk_execute_rq_nowait(struct request *rq, bool at_head); |
b84ba30b | 1009 | blk_status_t blk_execute_rq(struct request *rq, bool at_head); |
c6e99ea4 | 1010 | bool blk_rq_is_poll(struct request *rq); |
24b83deb CH |
1011 | |
1012 | struct req_iterator { | |
1013 | struct bvec_iter iter; | |
1014 | struct bio *bio; | |
1015 | }; | |
1016 | ||
1017 | #define __rq_for_each_bio(_bio, rq) \ | |
1018 | if ((rq->bio)) \ | |
1019 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
1020 | ||
1021 | #define rq_for_each_segment(bvl, _rq, _iter) \ | |
1022 | __rq_for_each_bio(_iter.bio, _rq) \ | |
1023 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) | |
1024 | ||
1025 | #define rq_for_each_bvec(bvl, _rq, _iter) \ | |
1026 | __rq_for_each_bio(_iter.bio, _rq) \ | |
1027 | bio_for_each_bvec(bvl, _iter.bio, _iter.iter) | |
1028 | ||
1029 | #define rq_iter_last(bvec, _iter) \ | |
1030 | (_iter.bio->bi_next == NULL && \ | |
1031 | bio_iter_last(bvec, _iter.iter)) | |
1032 | ||
1033 | /* | |
1034 | * blk_rq_pos() : the current sector | |
1035 | * blk_rq_bytes() : bytes left in the entire request | |
1036 | * blk_rq_cur_bytes() : bytes left in the current segment | |
24b83deb CH |
1037 | * blk_rq_sectors() : sectors left in the entire request |
1038 | * blk_rq_cur_sectors() : sectors left in the current segment | |
1039 | * blk_rq_stats_sectors() : sectors of the entire request used for stats | |
1040 | */ | |
1041 | static inline sector_t blk_rq_pos(const struct request *rq) | |
1042 | { | |
1043 | return rq->__sector; | |
1044 | } | |
1045 | ||
1046 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
1047 | { | |
1048 | return rq->__data_len; | |
1049 | } | |
1050 | ||
1051 | static inline int blk_rq_cur_bytes(const struct request *rq) | |
1052 | { | |
b6559d8f CH |
1053 | if (!rq->bio) |
1054 | return 0; | |
1055 | if (!bio_has_data(rq->bio)) /* dataless requests such as discard */ | |
1056 | return rq->bio->bi_iter.bi_size; | |
1057 | return bio_iovec(rq->bio).bv_len; | |
24b83deb CH |
1058 | } |
1059 | ||
24b83deb CH |
1060 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
1061 | { | |
1062 | return blk_rq_bytes(rq) >> SECTOR_SHIFT; | |
1063 | } | |
1064 | ||
1065 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
1066 | { | |
1067 | return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; | |
1068 | } | |
1069 | ||
1070 | static inline unsigned int blk_rq_stats_sectors(const struct request *rq) | |
1071 | { | |
1072 | return rq->stats_sectors; | |
1073 | } | |
1074 | ||
1075 | /* | |
1076 | * Some commands like WRITE SAME have a payload or data transfer size which | |
1077 | * is different from the size of the request. Any driver that supports such | |
1078 | * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to | |
1079 | * calculate the data transfer size. | |
1080 | */ | |
1081 | static inline unsigned int blk_rq_payload_bytes(struct request *rq) | |
1082 | { | |
1083 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1084 | return rq->special_vec.bv_len; | |
1085 | return blk_rq_bytes(rq); | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Return the first full biovec in the request. The caller needs to check that | |
1090 | * there are any bvecs before calling this helper. | |
1091 | */ | |
1092 | static inline struct bio_vec req_bvec(struct request *rq) | |
1093 | { | |
1094 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1095 | return rq->special_vec; | |
1096 | return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); | |
1097 | } | |
1098 | ||
1099 | static inline unsigned int blk_rq_count_bios(struct request *rq) | |
1100 | { | |
1101 | unsigned int nr_bios = 0; | |
1102 | struct bio *bio; | |
1103 | ||
1104 | __rq_for_each_bio(bio, rq) | |
1105 | nr_bios++; | |
1106 | ||
1107 | return nr_bios; | |
1108 | } | |
1109 | ||
1110 | void blk_steal_bios(struct bio_list *list, struct request *rq); | |
1111 | ||
1112 | /* | |
1113 | * Request completion related functions. | |
1114 | * | |
1115 | * blk_update_request() completes given number of bytes and updates | |
1116 | * the request without completing it. | |
1117 | */ | |
1118 | bool blk_update_request(struct request *rq, blk_status_t error, | |
1119 | unsigned int nr_bytes); | |
1120 | void blk_abort_request(struct request *); | |
1121 | ||
1122 | /* | |
1123 | * Number of physical segments as sent to the device. | |
1124 | * | |
1125 | * Normally this is the number of discontiguous data segments sent by the | |
1126 | * submitter. But for data-less command like discard we might have no | |
1127 | * actual data segments submitted, but the driver might have to add it's | |
1128 | * own special payload. In that case we still return 1 here so that this | |
1129 | * special payload will be mapped. | |
1130 | */ | |
1131 | static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) | |
1132 | { | |
1133 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1134 | return 1; | |
1135 | return rq->nr_phys_segments; | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Number of discard segments (or ranges) the driver needs to fill in. | |
1140 | * Each discard bio merged into a request is counted as one segment. | |
1141 | */ | |
1142 | static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) | |
1143 | { | |
1144 | return max_t(unsigned short, rq->nr_phys_segments, 1); | |
1145 | } | |
1146 | ||
1147 | int __blk_rq_map_sg(struct request_queue *q, struct request *rq, | |
1148 | struct scatterlist *sglist, struct scatterlist **last_sg); | |
1149 | static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, | |
1150 | struct scatterlist *sglist) | |
1151 | { | |
1152 | struct scatterlist *last_sg = NULL; | |
1153 | ||
1154 | return __blk_rq_map_sg(q, rq, sglist, &last_sg); | |
1155 | } | |
1156 | void blk_dump_rq_flags(struct request *, char *); | |
1157 | ||
1158 | #ifdef CONFIG_BLK_DEV_ZONED | |
1159 | static inline unsigned int blk_rq_zone_no(struct request *rq) | |
1160 | { | |
d86e716a | 1161 | return disk_zone_no(rq->q->disk, blk_rq_pos(rq)); |
24b83deb CH |
1162 | } |
1163 | ||
1164 | static inline unsigned int blk_rq_zone_is_seq(struct request *rq) | |
1165 | { | |
d86e716a | 1166 | return disk_zone_is_seq(rq->q->disk, blk_rq_pos(rq)); |
24b83deb CH |
1167 | } |
1168 | ||
1169 | bool blk_req_needs_zone_write_lock(struct request *rq); | |
1170 | bool blk_req_zone_write_trylock(struct request *rq); | |
1171 | void __blk_req_zone_write_lock(struct request *rq); | |
1172 | void __blk_req_zone_write_unlock(struct request *rq); | |
1173 | ||
1174 | static inline void blk_req_zone_write_lock(struct request *rq) | |
1175 | { | |
1176 | if (blk_req_needs_zone_write_lock(rq)) | |
1177 | __blk_req_zone_write_lock(rq); | |
1178 | } | |
1179 | ||
1180 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
1181 | { | |
1182 | if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) | |
1183 | __blk_req_zone_write_unlock(rq); | |
1184 | } | |
1185 | ||
1186 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
1187 | { | |
d86e716a CH |
1188 | return rq->q->disk->seq_zones_wlock && |
1189 | test_bit(blk_rq_zone_no(rq), rq->q->disk->seq_zones_wlock); | |
24b83deb CH |
1190 | } |
1191 | ||
1192 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
1193 | { | |
1194 | if (!blk_req_needs_zone_write_lock(rq)) | |
1195 | return true; | |
1196 | return !blk_req_zone_is_write_locked(rq); | |
1197 | } | |
1198 | #else /* CONFIG_BLK_DEV_ZONED */ | |
1199 | static inline bool blk_req_needs_zone_write_lock(struct request *rq) | |
1200 | { | |
1201 | return false; | |
1202 | } | |
1203 | ||
1204 | static inline void blk_req_zone_write_lock(struct request *rq) | |
1205 | { | |
1206 | } | |
1207 | ||
1208 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
1209 | { | |
1210 | } | |
1211 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
1212 | { | |
1213 | return false; | |
1214 | } | |
1215 | ||
1216 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
1217 | { | |
1218 | return true; | |
1219 | } | |
1220 | #endif /* CONFIG_BLK_DEV_ZONED */ | |
1221 | ||
24b83deb | 1222 | #endif /* BLK_MQ_H */ |