1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef BLK_MQ_H |
3 | #define BLK_MQ_H |
4 | |
5 | #include <linux/blkdev.h> |
6 | #include <linux/sbitmap.h> |
7 | #include <linux/lockdep.h> |
8 | #include <linux/scatterlist.h> |
9 | #include <linux/prefetch.h> |
10 | #include <linux/srcu.h> |
11 | |
12 | struct blk_mq_tags; |
13 | struct blk_flush_queue; |
14 | |
15 | #define BLKDEV_MIN_RQ 4 |
16 | #define BLKDEV_DEFAULT_RQ 128 |
17 | |
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); |
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 | /* request for flush sequence */ |
32 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) |
33 | /* merge of different types, fail separately */ |
34 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) |
35 | /* don't call prep for this one */ |
36 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) |
37 | /* use hctx->sched_tags */ |
38 | #define RQF_SCHED_TAGS ((__force req_flags_t)(1 << 8)) |
39 | /* use an I/O scheduler for this request */ |
40 | #define RQF_USE_SCHED ((__force req_flags_t)(1 << 9)) |
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 | /* account into disk and partition IO statistics */ |
46 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) |
47 | /* runtime pm request */ |
48 | #define RQF_PM ((__force req_flags_t)(1 << 15)) |
49 | /* on IO scheduler merge hash */ |
50 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) |
51 | /* track IO completion time */ |
52 | #define RQF_STATS ((__force req_flags_t)(1 << 17)) |
53 | /* Look at ->special_vec for the actual data payload instead of the |
54 | bio chain. */ |
55 | #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) |
56 | /* The per-zone write lock is held for this request */ |
57 | #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) |
58 | /* ->timeout has been called, don't expire again */ |
59 | #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) |
60 | #define RQF_RESV ((__force req_flags_t)(1 << 23)) |
61 | |
62 | /* flags that prevent us from merging requests: */ |
63 | #define RQF_NOMERGE_FLAGS \ |
64 | (RQF_STARTED | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) |
65 | |
66 | enum mq_rq_state { |
67 | MQ_RQ_IDLE = 0, |
68 | MQ_RQ_IN_FLIGHT = 1, |
69 | MQ_RQ_COMPLETE = 2, |
70 | }; |
71 | |
72 | /* |
73 | * Try to put the fields that are referenced together in the same cacheline. |
74 | * |
75 | * If you modify this structure, make sure to update blk_rq_init() and |
76 | * especially blk_mq_rq_ctx_init() to take care of the added fields. |
77 | */ |
78 | struct request { |
79 | struct request_queue *q; |
80 | struct blk_mq_ctx *mq_ctx; |
81 | struct blk_mq_hw_ctx *mq_hctx; |
82 | |
83 | blk_opf_t cmd_flags; /* op and common flags */ |
84 | req_flags_t rq_flags; |
85 | |
86 | int tag; |
87 | int internal_tag; |
88 | |
89 | unsigned int timeout; |
90 | |
91 | /* the following two fields are internal, NEVER access directly */ |
92 | unsigned int __data_len; /* total data len */ |
93 | sector_t __sector; /* sector cursor */ |
94 | |
95 | struct bio *bio; |
96 | struct bio *biotail; |
97 | |
98 | union { |
99 | struct list_head queuelist; |
100 | struct request *rq_next; |
101 | }; |
102 | |
103 | struct block_device *part; |
104 | #ifdef CONFIG_BLK_RQ_ALLOC_TIME |
105 | /* Time that the first bio started allocating this request. */ |
106 | u64 alloc_time_ns; |
107 | #endif |
108 | /* Time that this request was allocated for this IO. */ |
109 | u64 start_time_ns; |
110 | /* Time that I/O was submitted to the device. */ |
111 | u64 io_start_time_ns; |
112 | |
113 | #ifdef CONFIG_BLK_WBT |
114 | unsigned short wbt_flags; |
115 | #endif |
116 | /* |
117 | * rq sectors used for blk stats. It has the same value |
118 | * with blk_rq_sectors(rq), except that it never be zeroed |
119 | * by completion. |
120 | */ |
121 | unsigned short stats_sectors; |
122 | |
123 | /* |
124 | * Number of scatter-gather DMA addr+len pairs after |
125 | * physical address coalescing is performed. |
126 | */ |
127 | unsigned short nr_phys_segments; |
128 | |
129 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
130 | unsigned short nr_integrity_segments; |
131 | #endif |
132 | |
133 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
134 | struct bio_crypt_ctx *crypt_ctx; |
135 | struct blk_crypto_keyslot *crypt_keyslot; |
136 | #endif |
137 | |
138 | unsigned short ioprio; |
139 | |
140 | enum mq_rq_state state; |
141 | atomic_t ref; |
142 | |
143 | unsigned long deadline; |
144 | |
145 | /* |
146 | * The hash is used inside the scheduler, and killed once the |
147 | * request reaches the dispatch list. The ipi_list is only used |
148 | * to queue the request for softirq completion, which is long |
149 | * after the request has been unhashed (and even removed from |
150 | * the dispatch list). |
151 | */ |
152 | union { |
153 | struct hlist_node hash; /* merge hash */ |
154 | struct llist_node ipi_list; |
155 | }; |
156 | |
157 | /* |
158 | * The rb_node is only used inside the io scheduler, requests |
159 | * are pruned when moved to the dispatch queue. special_vec must |
160 | * only be used if RQF_SPECIAL_PAYLOAD is set, and those cannot be |
161 | * insert into an IO scheduler. |
162 | */ |
163 | union { |
164 | struct rb_node rb_node; /* sort/lookup */ |
165 | struct bio_vec special_vec; |
166 | }; |
167 | |
168 | /* |
169 | * Three pointers are available for the IO schedulers, if they need |
170 | * more they have to dynamically allocate it. |
171 | */ |
172 | struct { |
173 | struct io_cq *icq; |
174 | void *priv[2]; |
175 | } elv; |
176 | |
177 | struct { |
178 | unsigned int seq; |
179 | rq_end_io_fn *saved_end_io; |
180 | } flush; |
181 | |
182 | u64 fifo_time; |
183 | |
184 | /* |
185 | * completion callback. |
186 | */ |
187 | rq_end_io_fn *end_io; |
188 | void *end_io_data; |
189 | }; |
190 | |
191 | static inline enum req_op req_op(const struct request *req) |
192 | { |
193 | return req->cmd_flags & REQ_OP_MASK; |
194 | } |
195 | |
196 | static inline bool blk_rq_is_passthrough(struct request *rq) |
197 | { |
198 | return blk_op_is_passthrough(op: rq->cmd_flags); |
199 | } |
200 | |
201 | static inline unsigned short req_get_ioprio(struct request *req) |
202 | { |
203 | return req->ioprio; |
204 | } |
205 | |
206 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
207 | |
208 | #define rq_dma_dir(rq) \ |
209 | (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) |
210 | |
211 | #define rq_list_add(listptr, rq) do { \ |
212 | (rq)->rq_next = *(listptr); \ |
213 | *(listptr) = rq; \ |
214 | } while (0) |
215 | |
216 | #define rq_list_add_tail(lastpptr, rq) do { \ |
217 | (rq)->rq_next = NULL; \ |
218 | **(lastpptr) = rq; \ |
219 | *(lastpptr) = &rq->rq_next; \ |
220 | } while (0) |
221 | |
222 | #define rq_list_pop(listptr) \ |
223 | ({ \ |
224 | struct request *__req = NULL; \ |
225 | if ((listptr) && *(listptr)) { \ |
226 | __req = *(listptr); \ |
227 | *(listptr) = __req->rq_next; \ |
228 | } \ |
229 | __req; \ |
230 | }) |
231 | |
232 | #define rq_list_peek(listptr) \ |
233 | ({ \ |
234 | struct request *__req = NULL; \ |
235 | if ((listptr) && *(listptr)) \ |
236 | __req = *(listptr); \ |
237 | __req; \ |
238 | }) |
239 | |
240 | #define rq_list_for_each(listptr, pos) \ |
241 | for (pos = rq_list_peek((listptr)); pos; pos = rq_list_next(pos)) |
242 | |
243 | #define rq_list_for_each_safe(listptr, pos, nxt) \ |
244 | for (pos = rq_list_peek((listptr)), nxt = rq_list_next(pos); \ |
245 | pos; pos = nxt, nxt = pos ? rq_list_next(pos) : NULL) |
246 | |
247 | #define rq_list_next(rq) (rq)->rq_next |
248 | #define rq_list_empty(list) ((list) == (struct request *) NULL) |
249 | |
250 | /** |
251 | * rq_list_move() - move a struct request from one list to another |
252 | * @src: The source list @rq is currently in |
253 | * @dst: The destination list that @rq will be appended to |
254 | * @rq: The request to move |
255 | * @prev: The request preceding @rq in @src (NULL if @rq is the head) |
256 | */ |
257 | static inline void rq_list_move(struct request **src, struct request **dst, |
258 | struct request *rq, struct request *prev) |
259 | { |
260 | if (prev) |
261 | prev->rq_next = rq->rq_next; |
262 | else |
263 | *src = rq->rq_next; |
264 | rq_list_add(dst, rq); |
265 | } |
266 | |
267 | /** |
268 | * enum blk_eh_timer_return - How the timeout handler should proceed |
269 | * @BLK_EH_DONE: The block driver completed the command or will complete it at |
270 | * a later time. |
271 | * @BLK_EH_RESET_TIMER: Reset the request timer and continue waiting for the |
272 | * request to complete. |
273 | */ |
274 | enum blk_eh_timer_return { |
275 | BLK_EH_DONE, |
276 | BLK_EH_RESET_TIMER, |
277 | }; |
278 | |
279 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
280 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ |
281 | |
282 | /** |
283 | * struct blk_mq_hw_ctx - State for a hardware queue facing the hardware |
284 | * block device |
285 | */ |
286 | struct blk_mq_hw_ctx { |
287 | struct { |
288 | /** @lock: Protects the dispatch list. */ |
289 | spinlock_t lock; |
290 | /** |
291 | * @dispatch: Used for requests that are ready to be |
292 | * dispatched to the hardware but for some reason (e.g. lack of |
293 | * resources) could not be sent to the hardware. As soon as the |
294 | * driver can send new requests, requests at this list will |
295 | * be sent first for a fairer dispatch. |
296 | */ |
297 | struct list_head dispatch; |
298 | /** |
299 | * @state: BLK_MQ_S_* flags. Defines the state of the hw |
300 | * queue (active, scheduled to restart, stopped). |
301 | */ |
302 | unsigned long state; |
303 | } ____cacheline_aligned_in_smp; |
304 | |
305 | /** |
306 | * @run_work: Used for scheduling a hardware queue run at a later time. |
307 | */ |
308 | struct delayed_work run_work; |
309 | /** @cpumask: Map of available CPUs where this hctx can run. */ |
310 | cpumask_var_t cpumask; |
311 | /** |
312 | * @next_cpu: Used by blk_mq_hctx_next_cpu() for round-robin CPU |
313 | * selection from @cpumask. |
314 | */ |
315 | int next_cpu; |
316 | /** |
317 | * @next_cpu_batch: Counter of how many works left in the batch before |
318 | * changing to the next CPU. |
319 | */ |
320 | int next_cpu_batch; |
321 | |
322 | /** @flags: BLK_MQ_F_* flags. Defines the behaviour of the queue. */ |
323 | unsigned long flags; |
324 | |
325 | /** |
326 | * @sched_data: Pointer owned by the IO scheduler attached to a request |
327 | * queue. It's up to the IO scheduler how to use this pointer. |
328 | */ |
329 | void *sched_data; |
330 | /** |
331 | * @queue: Pointer to the request queue that owns this hardware context. |
332 | */ |
333 | struct request_queue *queue; |
334 | /** @fq: Queue of requests that need to perform a flush operation. */ |
335 | struct blk_flush_queue *fq; |
336 | |
337 | /** |
338 | * @driver_data: Pointer to data owned by the block driver that created |
339 | * this hctx |
340 | */ |
341 | void *driver_data; |
342 | |
343 | /** |
344 | * @ctx_map: Bitmap for each software queue. If bit is on, there is a |
345 | * pending request in that software queue. |
346 | */ |
347 | struct sbitmap ctx_map; |
348 | |
349 | /** |
350 | * @dispatch_from: Software queue to be used when no scheduler was |
351 | * selected. |
352 | */ |
353 | struct blk_mq_ctx *dispatch_from; |
354 | /** |
355 | * @dispatch_busy: Number used by blk_mq_update_dispatch_busy() to |
356 | * decide if the hw_queue is busy using Exponential Weighted Moving |
357 | * Average algorithm. |
358 | */ |
359 | unsigned int dispatch_busy; |
360 | |
361 | /** @type: HCTX_TYPE_* flags. Type of hardware queue. */ |
362 | unsigned short type; |
363 | /** @nr_ctx: Number of software queues. */ |
364 | unsigned short nr_ctx; |
365 | /** @ctxs: Array of software queues. */ |
366 | struct blk_mq_ctx **ctxs; |
367 | |
368 | /** @dispatch_wait_lock: Lock for dispatch_wait queue. */ |
369 | spinlock_t dispatch_wait_lock; |
370 | /** |
371 | * @dispatch_wait: Waitqueue to put requests when there is no tag |
372 | * available at the moment, to wait for another try in the future. |
373 | */ |
374 | wait_queue_entry_t dispatch_wait; |
375 | |
376 | /** |
377 | * @wait_index: Index of next available dispatch_wait queue to insert |
378 | * requests. |
379 | */ |
380 | atomic_t wait_index; |
381 | |
382 | /** |
383 | * @tags: Tags owned by the block driver. A tag at this set is only |
384 | * assigned when a request is dispatched from a hardware queue. |
385 | */ |
386 | struct blk_mq_tags *tags; |
387 | /** |
388 | * @sched_tags: Tags owned by I/O scheduler. If there is an I/O |
389 | * scheduler associated with a request queue, a tag is assigned when |
390 | * that request is allocated. Else, this member is not used. |
391 | */ |
392 | struct blk_mq_tags *sched_tags; |
393 | |
394 | /** @run: Number of dispatched requests. */ |
395 | unsigned long run; |
396 | |
397 | /** @numa_node: NUMA node the storage adapter has been connected to. */ |
398 | unsigned int numa_node; |
399 | /** @queue_num: Index of this hardware queue. */ |
400 | unsigned int queue_num; |
401 | |
402 | /** |
403 | * @nr_active: Number of active requests. Only used when a tag set is |
404 | * shared across request queues. |
405 | */ |
406 | atomic_t nr_active; |
407 | |
408 | /** @cpuhp_online: List to store request if CPU is going to die */ |
409 | struct hlist_node cpuhp_online; |
410 | /** @cpuhp_dead: List to store request if some CPU die. */ |
411 | struct hlist_node cpuhp_dead; |
412 | /** @kobj: Kernel object for sysfs. */ |
413 | struct kobject kobj; |
414 | |
415 | #ifdef CONFIG_BLK_DEBUG_FS |
416 | /** |
417 | * @debugfs_dir: debugfs directory for this hardware queue. Named |
418 | * as cpu<cpu_number>. |
419 | */ |
420 | struct dentry *debugfs_dir; |
421 | /** @sched_debugfs_dir: debugfs directory for the scheduler. */ |
422 | struct dentry *sched_debugfs_dir; |
423 | #endif |
424 | |
425 | /** |
426 | * @hctx_list: if this hctx is not in use, this is an entry in |
427 | * q->unused_hctx_list. |
428 | */ |
429 | struct list_head hctx_list; |
430 | }; |
431 | |
432 | /** |
433 | * struct blk_mq_queue_map - Map software queues to hardware queues |
434 | * @mq_map: CPU ID to hardware queue index map. This is an array |
435 | * with nr_cpu_ids elements. Each element has a value in the range |
436 | * [@queue_offset, @queue_offset + @nr_queues). |
437 | * @nr_queues: Number of hardware queues to map CPU IDs onto. |
438 | * @queue_offset: First hardware queue to map onto. Used by the PCIe NVMe |
439 | * driver to map each hardware queue type (enum hctx_type) onto a distinct |
440 | * set of hardware queues. |
441 | */ |
442 | struct blk_mq_queue_map { |
443 | unsigned int *mq_map; |
444 | unsigned int nr_queues; |
445 | unsigned int queue_offset; |
446 | }; |
447 | |
448 | /** |
449 | * enum hctx_type - Type of hardware queue |
450 | * @HCTX_TYPE_DEFAULT: All I/O not otherwise accounted for. |
451 | * @HCTX_TYPE_READ: Just for READ I/O. |
452 | * @HCTX_TYPE_POLL: Polled I/O of any kind. |
453 | * @HCTX_MAX_TYPES: Number of types of hctx. |
454 | */ |
455 | enum hctx_type { |
456 | HCTX_TYPE_DEFAULT, |
457 | HCTX_TYPE_READ, |
458 | HCTX_TYPE_POLL, |
459 | |
460 | HCTX_MAX_TYPES, |
461 | }; |
462 | |
463 | /** |
464 | * struct blk_mq_tag_set - tag set that can be shared between request queues |
465 | * @ops: Pointers to functions that implement block driver behavior. |
466 | * @map: One or more ctx -> hctx mappings. One map exists for each |
467 | * hardware queue type (enum hctx_type) that the driver wishes |
468 | * to support. There are no restrictions on maps being of the |
469 | * same size, and it's perfectly legal to share maps between |
470 | * types. |
471 | * @nr_maps: Number of elements in the @map array. A number in the range |
472 | * [1, HCTX_MAX_TYPES]. |
473 | * @nr_hw_queues: Number of hardware queues supported by the block driver that |
474 | * owns this data structure. |
475 | * @queue_depth: Number of tags per hardware queue, reserved tags included. |
476 | * @reserved_tags: Number of tags to set aside for BLK_MQ_REQ_RESERVED tag |
477 | * allocations. |
478 | * @cmd_size: Number of additional bytes to allocate per request. The block |
479 | * driver owns these additional bytes. |
480 | * @numa_node: NUMA node the storage adapter has been connected to. |
481 | * @timeout: Request processing timeout in jiffies. |
482 | * @flags: Zero or more BLK_MQ_F_* flags. |
483 | * @driver_data: Pointer to data owned by the block driver that created this |
484 | * tag set. |
485 | * @tags: Tag sets. One tag set per hardware queue. Has @nr_hw_queues |
486 | * elements. |
487 | * @shared_tags: |
488 | * Shared set of tags. Has @nr_hw_queues elements. If set, |
489 | * shared by all @tags. |
490 | * @tag_list_lock: Serializes tag_list accesses. |
491 | * @tag_list: List of the request queues that use this tag set. See also |
492 | * request_queue.tag_set_list. |
493 | * @srcu: Use as lock when type of the request queue is blocking |
494 | * (BLK_MQ_F_BLOCKING). |
495 | */ |
496 | struct blk_mq_tag_set { |
497 | const struct blk_mq_ops *ops; |
498 | struct blk_mq_queue_map map[HCTX_MAX_TYPES]; |
499 | unsigned int nr_maps; |
500 | unsigned int nr_hw_queues; |
501 | unsigned int queue_depth; |
502 | unsigned int reserved_tags; |
503 | unsigned int cmd_size; |
504 | int numa_node; |
505 | unsigned int timeout; |
506 | unsigned int flags; |
507 | void *driver_data; |
508 | |
509 | struct blk_mq_tags **tags; |
510 | |
511 | struct blk_mq_tags *shared_tags; |
512 | |
513 | struct mutex tag_list_lock; |
514 | struct list_head tag_list; |
515 | struct srcu_struct *srcu; |
516 | }; |
517 | |
518 | /** |
519 | * struct blk_mq_queue_data - Data about a request inserted in a queue |
520 | * |
521 | * @rq: Request pointer. |
522 | * @last: If it is the last request in the queue. |
523 | */ |
524 | struct blk_mq_queue_data { |
525 | struct request *rq; |
526 | bool last; |
527 | }; |
528 | |
529 | typedef bool (busy_tag_iter_fn)(struct request *, void *); |
530 | |
531 | /** |
532 | * struct blk_mq_ops - Callback functions that implements block driver |
533 | * behaviour. |
534 | */ |
535 | struct blk_mq_ops { |
536 | /** |
537 | * @queue_rq: Queue a new request from block IO. |
538 | */ |
539 | blk_status_t (*queue_rq)(struct blk_mq_hw_ctx *, |
540 | const struct blk_mq_queue_data *); |
541 | |
542 | /** |
543 | * @commit_rqs: If a driver uses bd->last to judge when to submit |
544 | * requests to hardware, it must define this function. In case of errors |
545 | * that make us stop issuing further requests, this hook serves the |
546 | * purpose of kicking the hardware (which the last request otherwise |
547 | * would have done). |
548 | */ |
549 | void (*commit_rqs)(struct blk_mq_hw_ctx *); |
550 | |
551 | /** |
552 | * @queue_rqs: Queue a list of new requests. Driver is guaranteed |
553 | * that each request belongs to the same queue. If the driver doesn't |
554 | * empty the @rqlist completely, then the rest will be queued |
555 | * individually by the block layer upon return. |
556 | */ |
557 | void (*queue_rqs)(struct request **rqlist); |
558 | |
559 | /** |
560 | * @get_budget: Reserve budget before queue request, once .queue_rq is |
561 | * run, it is driver's responsibility to release the |
562 | * reserved budget. Also we have to handle failure case |
563 | * of .get_budget for avoiding I/O deadlock. |
564 | */ |
565 | int (*get_budget)(struct request_queue *); |
566 | |
567 | /** |
568 | * @put_budget: Release the reserved budget. |
569 | */ |
570 | void (*put_budget)(struct request_queue *, int); |
571 | |
572 | /** |
573 | * @set_rq_budget_token: store rq's budget token |
574 | */ |
575 | void (*set_rq_budget_token)(struct request *, int); |
576 | /** |
577 | * @get_rq_budget_token: retrieve rq's budget token |
578 | */ |
579 | int (*get_rq_budget_token)(struct request *); |
580 | |
581 | /** |
582 | * @timeout: Called on request timeout. |
583 | */ |
584 | enum blk_eh_timer_return (*timeout)(struct request *); |
585 | |
586 | /** |
587 | * @poll: Called to poll for completion of a specific tag. |
588 | */ |
589 | int (*poll)(struct blk_mq_hw_ctx *, struct io_comp_batch *); |
590 | |
591 | /** |
592 | * @complete: Mark the request as complete. |
593 | */ |
594 | void (*complete)(struct request *); |
595 | |
596 | /** |
597 | * @init_hctx: Called when the block layer side of a hardware queue has |
598 | * been set up, allowing the driver to allocate/init matching |
599 | * structures. |
600 | */ |
601 | int (*init_hctx)(struct blk_mq_hw_ctx *, void *, unsigned int); |
602 | /** |
603 | * @exit_hctx: Ditto for exit/teardown. |
604 | */ |
605 | void (*exit_hctx)(struct blk_mq_hw_ctx *, unsigned int); |
606 | |
607 | /** |
608 | * @init_request: Called for every command allocated by the block layer |
609 | * to allow the driver to set up driver specific data. |
610 | * |
611 | * Tag greater than or equal to queue_depth is for setting up |
612 | * flush request. |
613 | */ |
614 | int (*init_request)(struct blk_mq_tag_set *set, struct request *, |
615 | unsigned int, unsigned int); |
616 | /** |
617 | * @exit_request: Ditto for exit/teardown. |
618 | */ |
619 | void (*exit_request)(struct blk_mq_tag_set *set, struct request *, |
620 | unsigned int); |
621 | |
622 | /** |
623 | * @cleanup_rq: Called before freeing one request which isn't completed |
624 | * yet, and usually for freeing the driver private data. |
625 | */ |
626 | void (*cleanup_rq)(struct request *); |
627 | |
628 | /** |
629 | * @busy: If set, returns whether or not this queue currently is busy. |
630 | */ |
631 | bool (*busy)(struct request_queue *); |
632 | |
633 | /** |
634 | * @map_queues: This allows drivers specify their own queue mapping by |
635 | * overriding the setup-time function that builds the mq_map. |
636 | */ |
637 | void (*map_queues)(struct blk_mq_tag_set *set); |
638 | |
639 | #ifdef CONFIG_BLK_DEBUG_FS |
640 | /** |
641 | * @show_rq: Used by the debugfs implementation to show driver-specific |
642 | * information about a request. |
643 | */ |
644 | void (*show_rq)(struct seq_file *m, struct request *rq); |
645 | #endif |
646 | }; |
647 | |
648 | enum { |
649 | BLK_MQ_F_SHOULD_MERGE = 1 << 0, |
650 | BLK_MQ_F_TAG_QUEUE_SHARED = 1 << 1, |
651 | /* |
652 | * Set when this device requires underlying blk-mq device for |
653 | * completing IO: |
654 | */ |
655 | BLK_MQ_F_STACKING = 1 << 2, |
656 | BLK_MQ_F_TAG_HCTX_SHARED = 1 << 3, |
657 | BLK_MQ_F_BLOCKING = 1 << 5, |
658 | /* Do not allow an I/O scheduler to be configured. */ |
659 | BLK_MQ_F_NO_SCHED = 1 << 6, |
660 | /* |
661 | * Select 'none' during queue registration in case of a single hwq |
662 | * or shared hwqs instead of 'mq-deadline'. |
663 | */ |
664 | BLK_MQ_F_NO_SCHED_BY_DEFAULT = 1 << 7, |
665 | BLK_MQ_F_ALLOC_POLICY_START_BIT = 8, |
666 | BLK_MQ_F_ALLOC_POLICY_BITS = 1, |
667 | |
668 | BLK_MQ_S_STOPPED = 0, |
669 | BLK_MQ_S_TAG_ACTIVE = 1, |
670 | BLK_MQ_S_SCHED_RESTART = 2, |
671 | |
672 | /* hw queue is inactive after all its CPUs become offline */ |
673 | BLK_MQ_S_INACTIVE = 3, |
674 | |
675 | BLK_MQ_MAX_DEPTH = 10240, |
676 | |
677 | BLK_MQ_CPU_WORK_BATCH = 8, |
678 | }; |
679 | #define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \ |
680 | ((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \ |
681 | ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) |
682 | #define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \ |
683 | ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \ |
684 | << BLK_MQ_F_ALLOC_POLICY_START_BIT) |
685 | |
686 | #define BLK_MQ_NO_HCTX_IDX (-1U) |
687 | |
688 | struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set, void *queuedata, |
689 | struct lock_class_key *lkclass); |
690 | #define blk_mq_alloc_disk(set, queuedata) \ |
691 | ({ \ |
692 | static struct lock_class_key __key; \ |
693 | \ |
694 | __blk_mq_alloc_disk(set, queuedata, &__key); \ |
695 | }) |
696 | struct gendisk *blk_mq_alloc_disk_for_queue(struct request_queue *q, |
697 | struct lock_class_key *lkclass); |
698 | struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *); |
699 | int blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, |
700 | struct request_queue *q); |
701 | void blk_mq_destroy_queue(struct request_queue *); |
702 | |
703 | int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set); |
704 | int blk_mq_alloc_sq_tag_set(struct blk_mq_tag_set *set, |
705 | const struct blk_mq_ops *ops, unsigned int queue_depth, |
706 | unsigned int set_flags); |
707 | void blk_mq_free_tag_set(struct blk_mq_tag_set *set); |
708 | |
709 | void blk_mq_free_request(struct request *rq); |
710 | int blk_rq_poll(struct request *rq, struct io_comp_batch *iob, |
711 | unsigned int poll_flags); |
712 | |
713 | bool blk_mq_queue_inflight(struct request_queue *q); |
714 | |
715 | enum { |
716 | /* return when out of requests */ |
717 | BLK_MQ_REQ_NOWAIT = (__force blk_mq_req_flags_t)(1 << 0), |
718 | /* allocate from reserved pool */ |
719 | BLK_MQ_REQ_RESERVED = (__force blk_mq_req_flags_t)(1 << 1), |
720 | /* set RQF_PM */ |
721 | BLK_MQ_REQ_PM = (__force blk_mq_req_flags_t)(1 << 2), |
722 | }; |
723 | |
724 | struct request *blk_mq_alloc_request(struct request_queue *q, blk_opf_t opf, |
725 | blk_mq_req_flags_t flags); |
726 | struct request *blk_mq_alloc_request_hctx(struct request_queue *q, |
727 | blk_opf_t opf, blk_mq_req_flags_t flags, |
728 | unsigned int hctx_idx); |
729 | |
730 | /* |
731 | * Tag address space map. |
732 | */ |
733 | struct blk_mq_tags { |
734 | unsigned int nr_tags; |
735 | unsigned int nr_reserved_tags; |
736 | unsigned int active_queues; |
737 | |
738 | struct sbitmap_queue bitmap_tags; |
739 | struct sbitmap_queue breserved_tags; |
740 | |
741 | struct request **rqs; |
742 | struct request **static_rqs; |
743 | struct list_head page_list; |
744 | |
745 | /* |
746 | * used to clear request reference in rqs[] before freeing one |
747 | * request pool |
748 | */ |
749 | spinlock_t lock; |
750 | }; |
751 | |
752 | static inline struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, |
753 | unsigned int tag) |
754 | { |
755 | if (tag < tags->nr_tags) { |
756 | prefetch(tags->rqs[tag]); |
757 | return tags->rqs[tag]; |
758 | } |
759 | |
760 | return NULL; |
761 | } |
762 | |
763 | enum { |
764 | BLK_MQ_UNIQUE_TAG_BITS = 16, |
765 | BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1, |
766 | }; |
767 | |
768 | u32 blk_mq_unique_tag(struct request *rq); |
769 | |
770 | static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag) |
771 | { |
772 | return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS; |
773 | } |
774 | |
775 | static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag) |
776 | { |
777 | return unique_tag & BLK_MQ_UNIQUE_TAG_MASK; |
778 | } |
779 | |
780 | /** |
781 | * blk_mq_rq_state() - read the current MQ_RQ_* state of a request |
782 | * @rq: target request. |
783 | */ |
784 | static inline enum mq_rq_state blk_mq_rq_state(struct request *rq) |
785 | { |
786 | return READ_ONCE(rq->state); |
787 | } |
788 | |
789 | static inline int blk_mq_request_started(struct request *rq) |
790 | { |
791 | return blk_mq_rq_state(rq) != MQ_RQ_IDLE; |
792 | } |
793 | |
794 | static inline int blk_mq_request_completed(struct request *rq) |
795 | { |
796 | return blk_mq_rq_state(rq) == MQ_RQ_COMPLETE; |
797 | } |
798 | |
799 | /* |
800 | * |
801 | * Set the state to complete when completing a request from inside ->queue_rq. |
802 | * This is used by drivers that want to ensure special complete actions that |
803 | * need access to the request are called on failure, e.g. by nvme for |
804 | * multipathing. |
805 | */ |
806 | static inline void blk_mq_set_request_complete(struct request *rq) |
807 | { |
808 | WRITE_ONCE(rq->state, MQ_RQ_COMPLETE); |
809 | } |
810 | |
811 | /* |
812 | * Complete the request directly instead of deferring it to softirq or |
813 | * completing it another CPU. Useful in preemptible instead of an interrupt. |
814 | */ |
815 | static inline void blk_mq_complete_request_direct(struct request *rq, |
816 | void (*complete)(struct request *rq)) |
817 | { |
818 | WRITE_ONCE(rq->state, MQ_RQ_COMPLETE); |
819 | complete(rq); |
820 | } |
821 | |
822 | void blk_mq_start_request(struct request *rq); |
823 | void blk_mq_end_request(struct request *rq, blk_status_t error); |
824 | void __blk_mq_end_request(struct request *rq, blk_status_t error); |
825 | void blk_mq_end_request_batch(struct io_comp_batch *ib); |
826 | |
827 | /* |
828 | * Only need start/end time stamping if we have iostat or |
829 | * blk stats enabled, or using an IO scheduler. |
830 | */ |
831 | static inline bool blk_mq_need_time_stamp(struct request *rq) |
832 | { |
833 | return (rq->rq_flags & (RQF_IO_STAT | RQF_STATS | RQF_USE_SCHED)); |
834 | } |
835 | |
836 | static inline bool blk_mq_is_reserved_rq(struct request *rq) |
837 | { |
838 | return rq->rq_flags & RQF_RESV; |
839 | } |
840 | |
841 | /* |
842 | * Batched completions only work when there is no I/O error and no special |
843 | * ->end_io handler. |
844 | */ |
845 | static inline bool blk_mq_add_to_batch(struct request *req, |
846 | struct io_comp_batch *iob, int ioerror, |
847 | void (*complete)(struct io_comp_batch *)) |
848 | { |
849 | /* |
850 | * blk_mq_end_request_batch() can't end request allocated from |
851 | * sched tags |
852 | */ |
853 | if (!iob || (req->rq_flags & RQF_SCHED_TAGS) || ioerror || |
854 | (req->end_io && !blk_rq_is_passthrough(rq: req))) |
855 | return false; |
856 | |
857 | if (!iob->complete) |
858 | iob->complete = complete; |
859 | else if (iob->complete != complete) |
860 | return false; |
861 | iob->need_ts |= blk_mq_need_time_stamp(rq: req); |
862 | rq_list_add(&iob->req_list, req); |
863 | return true; |
864 | } |
865 | |
866 | void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list); |
867 | void blk_mq_kick_requeue_list(struct request_queue *q); |
868 | void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs); |
869 | void blk_mq_complete_request(struct request *rq); |
870 | bool blk_mq_complete_request_remote(struct request *rq); |
871 | void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx); |
872 | void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx); |
873 | void blk_mq_stop_hw_queues(struct request_queue *q); |
874 | void blk_mq_start_hw_queues(struct request_queue *q); |
875 | void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); |
876 | void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async); |
877 | void blk_mq_quiesce_queue(struct request_queue *q); |
878 | void blk_mq_wait_quiesce_done(struct blk_mq_tag_set *set); |
879 | void blk_mq_quiesce_tagset(struct blk_mq_tag_set *set); |
880 | void blk_mq_unquiesce_tagset(struct blk_mq_tag_set *set); |
881 | void blk_mq_unquiesce_queue(struct request_queue *q); |
882 | void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs); |
883 | void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); |
884 | void blk_mq_run_hw_queues(struct request_queue *q, bool async); |
885 | void blk_mq_delay_run_hw_queues(struct request_queue *q, unsigned long msecs); |
886 | void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset, |
887 | busy_tag_iter_fn *fn, void *priv); |
888 | void blk_mq_tagset_wait_completed_request(struct blk_mq_tag_set *tagset); |
889 | void blk_mq_freeze_queue(struct request_queue *q); |
890 | void blk_mq_unfreeze_queue(struct request_queue *q); |
891 | void blk_freeze_queue_start(struct request_queue *q); |
892 | void blk_mq_freeze_queue_wait(struct request_queue *q); |
893 | int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, |
894 | unsigned long timeout); |
895 | |
896 | void blk_mq_map_queues(struct blk_mq_queue_map *qmap); |
897 | void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues); |
898 | |
899 | void blk_mq_quiesce_queue_nowait(struct request_queue *q); |
900 | |
901 | unsigned int blk_mq_rq_cpu(struct request *rq); |
902 | |
903 | bool __blk_should_fake_timeout(struct request_queue *q); |
904 | static inline bool blk_should_fake_timeout(struct request_queue *q) |
905 | { |
906 | if (IS_ENABLED(CONFIG_FAIL_IO_TIMEOUT) && |
907 | test_bit(QUEUE_FLAG_FAIL_IO, &q->queue_flags)) |
908 | return __blk_should_fake_timeout(q); |
909 | return false; |
910 | } |
911 | |
912 | /** |
913 | * blk_mq_rq_from_pdu - cast a PDU to a request |
914 | * @pdu: the PDU (Protocol Data Unit) to be casted |
915 | * |
916 | * Return: request |
917 | * |
918 | * Driver command data is immediately after the request. So subtract request |
919 | * size to get back to the original request. |
920 | */ |
921 | static inline struct request *blk_mq_rq_from_pdu(void *pdu) |
922 | { |
923 | return pdu - sizeof(struct request); |
924 | } |
925 | |
926 | /** |
927 | * blk_mq_rq_to_pdu - cast a request to a PDU |
928 | * @rq: the request to be casted |
929 | * |
930 | * Return: pointer to the PDU |
931 | * |
932 | * Driver command data is immediately after the request. So add request to get |
933 | * the PDU. |
934 | */ |
935 | static inline void *blk_mq_rq_to_pdu(struct request *rq) |
936 | { |
937 | return rq + 1; |
938 | } |
939 | |
940 | #define queue_for_each_hw_ctx(q, hctx, i) \ |
941 | xa_for_each(&(q)->hctx_table, (i), (hctx)) |
942 | |
943 | #define hctx_for_each_ctx(hctx, ctx, i) \ |
944 | for ((i) = 0; (i) < (hctx)->nr_ctx && \ |
945 | ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++) |
946 | |
947 | static inline void blk_mq_cleanup_rq(struct request *rq) |
948 | { |
949 | if (rq->q->mq_ops->cleanup_rq) |
950 | rq->q->mq_ops->cleanup_rq(rq); |
951 | } |
952 | |
953 | static inline void blk_rq_bio_prep(struct request *rq, struct bio *bio, |
954 | unsigned int nr_segs) |
955 | { |
956 | rq->nr_phys_segments = nr_segs; |
957 | rq->__data_len = bio->bi_iter.bi_size; |
958 | rq->bio = rq->biotail = bio; |
959 | rq->ioprio = bio_prio(bio); |
960 | } |
961 | |
962 | void blk_mq_hctx_set_fq_lock_class(struct blk_mq_hw_ctx *hctx, |
963 | struct lock_class_key *key); |
964 | |
965 | static inline bool rq_is_sync(struct request *rq) |
966 | { |
967 | return op_is_sync(op: rq->cmd_flags); |
968 | } |
969 | |
970 | void blk_rq_init(struct request_queue *q, struct request *rq); |
971 | int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
972 | struct bio_set *bs, gfp_t gfp_mask, |
973 | int (*bio_ctr)(struct bio *, struct bio *, void *), void *data); |
974 | void blk_rq_unprep_clone(struct request *rq); |
975 | blk_status_t blk_insert_cloned_request(struct request *rq); |
976 | |
977 | struct rq_map_data { |
978 | struct page **pages; |
979 | unsigned long offset; |
980 | unsigned short page_order; |
981 | unsigned short nr_entries; |
982 | bool null_mapped; |
983 | bool from_user; |
984 | }; |
985 | |
986 | int blk_rq_map_user(struct request_queue *, struct request *, |
987 | struct rq_map_data *, void __user *, unsigned long, gfp_t); |
988 | int blk_rq_map_user_io(struct request *, struct rq_map_data *, |
989 | void __user *, unsigned long, gfp_t, bool, int, bool, int); |
990 | int blk_rq_map_user_iov(struct request_queue *, struct request *, |
991 | struct rq_map_data *, const struct iov_iter *, gfp_t); |
992 | int blk_rq_unmap_user(struct bio *); |
993 | int blk_rq_map_kern(struct request_queue *, struct request *, void *, |
994 | unsigned int, gfp_t); |
995 | int blk_rq_append_bio(struct request *rq, struct bio *bio); |
996 | void blk_execute_rq_nowait(struct request *rq, bool at_head); |
997 | blk_status_t blk_execute_rq(struct request *rq, bool at_head); |
998 | bool blk_rq_is_poll(struct request *rq); |
999 | |
1000 | struct req_iterator { |
1001 | struct bvec_iter iter; |
1002 | struct bio *bio; |
1003 | }; |
1004 | |
1005 | #define __rq_for_each_bio(_bio, rq) \ |
1006 | if ((rq->bio)) \ |
1007 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) |
1008 | |
1009 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
1010 | __rq_for_each_bio(_iter.bio, _rq) \ |
1011 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
1012 | |
1013 | #define rq_for_each_bvec(bvl, _rq, _iter) \ |
1014 | __rq_for_each_bio(_iter.bio, _rq) \ |
1015 | bio_for_each_bvec(bvl, _iter.bio, _iter.iter) |
1016 | |
1017 | #define rq_iter_last(bvec, _iter) \ |
1018 | (_iter.bio->bi_next == NULL && \ |
1019 | bio_iter_last(bvec, _iter.iter)) |
1020 | |
1021 | /* |
1022 | * blk_rq_pos() : the current sector |
1023 | * blk_rq_bytes() : bytes left in the entire request |
1024 | * blk_rq_cur_bytes() : bytes left in the current segment |
1025 | * blk_rq_sectors() : sectors left in the entire request |
1026 | * blk_rq_cur_sectors() : sectors left in the current segment |
1027 | * blk_rq_stats_sectors() : sectors of the entire request used for stats |
1028 | */ |
1029 | static inline sector_t blk_rq_pos(const struct request *rq) |
1030 | { |
1031 | return rq->__sector; |
1032 | } |
1033 | |
1034 | static inline unsigned int blk_rq_bytes(const struct request *rq) |
1035 | { |
1036 | return rq->__data_len; |
1037 | } |
1038 | |
1039 | static inline int blk_rq_cur_bytes(const struct request *rq) |
1040 | { |
1041 | if (!rq->bio) |
1042 | return 0; |
1043 | if (!bio_has_data(bio: rq->bio)) /* dataless requests such as discard */ |
1044 | return rq->bio->bi_iter.bi_size; |
1045 | return bio_iovec(rq->bio).bv_len; |
1046 | } |
1047 | |
1048 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
1049 | { |
1050 | return blk_rq_bytes(rq) >> SECTOR_SHIFT; |
1051 | } |
1052 | |
1053 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) |
1054 | { |
1055 | return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; |
1056 | } |
1057 | |
1058 | static inline unsigned int blk_rq_stats_sectors(const struct request *rq) |
1059 | { |
1060 | return rq->stats_sectors; |
1061 | } |
1062 | |
1063 | /* |
1064 | * Some commands like WRITE SAME have a payload or data transfer size which |
1065 | * is different from the size of the request. Any driver that supports such |
1066 | * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to |
1067 | * calculate the data transfer size. |
1068 | */ |
1069 | static inline unsigned int blk_rq_payload_bytes(struct request *rq) |
1070 | { |
1071 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) |
1072 | return rq->special_vec.bv_len; |
1073 | return blk_rq_bytes(rq); |
1074 | } |
1075 | |
1076 | /* |
1077 | * Return the first full biovec in the request. The caller needs to check that |
1078 | * there are any bvecs before calling this helper. |
1079 | */ |
1080 | static inline struct bio_vec req_bvec(struct request *rq) |
1081 | { |
1082 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) |
1083 | return rq->special_vec; |
1084 | return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); |
1085 | } |
1086 | |
1087 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
1088 | { |
1089 | unsigned int nr_bios = 0; |
1090 | struct bio *bio; |
1091 | |
1092 | __rq_for_each_bio(bio, rq) |
1093 | nr_bios++; |
1094 | |
1095 | return nr_bios; |
1096 | } |
1097 | |
1098 | void blk_steal_bios(struct bio_list *list, struct request *rq); |
1099 | |
1100 | /* |
1101 | * Request completion related functions. |
1102 | * |
1103 | * blk_update_request() completes given number of bytes and updates |
1104 | * the request without completing it. |
1105 | */ |
1106 | bool blk_update_request(struct request *rq, blk_status_t error, |
1107 | unsigned int nr_bytes); |
1108 | void blk_abort_request(struct request *); |
1109 | |
1110 | /* |
1111 | * Number of physical segments as sent to the device. |
1112 | * |
1113 | * Normally this is the number of discontiguous data segments sent by the |
1114 | * submitter. But for data-less command like discard we might have no |
1115 | * actual data segments submitted, but the driver might have to add it's |
1116 | * own special payload. In that case we still return 1 here so that this |
1117 | * special payload will be mapped. |
1118 | */ |
1119 | static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) |
1120 | { |
1121 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) |
1122 | return 1; |
1123 | return rq->nr_phys_segments; |
1124 | } |
1125 | |
1126 | /* |
1127 | * Number of discard segments (or ranges) the driver needs to fill in. |
1128 | * Each discard bio merged into a request is counted as one segment. |
1129 | */ |
1130 | static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) |
1131 | { |
1132 | return max_t(unsigned short, rq->nr_phys_segments, 1); |
1133 | } |
1134 | |
1135 | int __blk_rq_map_sg(struct request_queue *q, struct request *rq, |
1136 | struct scatterlist *sglist, struct scatterlist **last_sg); |
1137 | static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, |
1138 | struct scatterlist *sglist) |
1139 | { |
1140 | struct scatterlist *last_sg = NULL; |
1141 | |
1142 | return __blk_rq_map_sg(q, rq, sglist, last_sg: &last_sg); |
1143 | } |
1144 | void blk_dump_rq_flags(struct request *, char *); |
1145 | |
1146 | #ifdef CONFIG_BLK_DEV_ZONED |
1147 | static inline unsigned int blk_rq_zone_no(struct request *rq) |
1148 | { |
1149 | return disk_zone_no(disk: rq->q->disk, sector: blk_rq_pos(rq)); |
1150 | } |
1151 | |
1152 | static inline unsigned int blk_rq_zone_is_seq(struct request *rq) |
1153 | { |
1154 | return disk_zone_is_seq(disk: rq->q->disk, sector: blk_rq_pos(rq)); |
1155 | } |
1156 | |
1157 | /** |
1158 | * blk_rq_is_seq_zoned_write() - Check if @rq requires write serialization. |
1159 | * @rq: Request to examine. |
1160 | * |
1161 | * Note: REQ_OP_ZONE_APPEND requests do not require serialization. |
1162 | */ |
1163 | static inline bool blk_rq_is_seq_zoned_write(struct request *rq) |
1164 | { |
1165 | return op_needs_zoned_write_locking(op: req_op(req: rq)) && |
1166 | blk_rq_zone_is_seq(rq); |
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 | { |
1188 | return rq->q->disk->seq_zones_wlock && |
1189 | test_bit(blk_rq_zone_no(rq), rq->q->disk->seq_zones_wlock); |
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_rq_is_seq_zoned_write(struct request *rq) |
1200 | { |
1201 | return false; |
1202 | } |
1203 | |
1204 | static inline bool blk_req_needs_zone_write_lock(struct request *rq) |
1205 | { |
1206 | return false; |
1207 | } |
1208 | |
1209 | static inline void blk_req_zone_write_lock(struct request *rq) |
1210 | { |
1211 | } |
1212 | |
1213 | static inline void blk_req_zone_write_unlock(struct request *rq) |
1214 | { |
1215 | } |
1216 | static inline bool blk_req_zone_is_write_locked(struct request *rq) |
1217 | { |
1218 | return false; |
1219 | } |
1220 | |
1221 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) |
1222 | { |
1223 | return true; |
1224 | } |
1225 | #endif /* CONFIG_BLK_DEV_ZONED */ |
1226 | |
1227 | #endif /* BLK_MQ_H */ |
1228 | |