Jens Axboe | 75bb462 | 2014-05-28 10:15:41 -0600 | [diff] [blame] | 1 | /* |
| 2 | * Block multiqueue core code |
| 3 | * |
| 4 | * Copyright (C) 2013-2014 Jens Axboe |
| 5 | * Copyright (C) 2013-2014 Christoph Hellwig |
| 6 | */ |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 7 | #include <linux/kernel.h> |
| 8 | #include <linux/module.h> |
| 9 | #include <linux/backing-dev.h> |
| 10 | #include <linux/bio.h> |
| 11 | #include <linux/blkdev.h> |
Catalin Marinas | f75782e | 2015-09-14 18:16:02 +0100 | [diff] [blame] | 12 | #include <linux/kmemleak.h> |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 13 | #include <linux/mm.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/workqueue.h> |
| 17 | #include <linux/smp.h> |
| 18 | #include <linux/llist.h> |
| 19 | #include <linux/list_sort.h> |
| 20 | #include <linux/cpu.h> |
| 21 | #include <linux/cache.h> |
| 22 | #include <linux/sched/sysctl.h> |
| 23 | #include <linux/delay.h> |
Jens Axboe | aedcd72 | 2014-09-17 08:27:03 -0600 | [diff] [blame] | 24 | #include <linux/crash_dump.h> |
Jens Axboe | 88c7b2b | 2016-08-25 08:07:30 -0600 | [diff] [blame] | 25 | #include <linux/prefetch.h> |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 26 | |
| 27 | #include <trace/events/block.h> |
| 28 | |
| 29 | #include <linux/blk-mq.h> |
| 30 | #include "blk.h" |
| 31 | #include "blk-mq.h" |
| 32 | #include "blk-mq-tag.h" |
Jens Axboe | cf43e6b | 2016-11-07 21:32:37 -0700 | [diff] [blame] | 33 | #include "blk-stat.h" |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 34 | #include "blk-wbt.h" |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 35 | |
| 36 | static DEFINE_MUTEX(all_q_mutex); |
| 37 | static LIST_HEAD(all_q_list); |
| 38 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 39 | /* |
| 40 | * Check if any of the ctx's have pending work in this hardware queue |
| 41 | */ |
| 42 | static bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx) |
| 43 | { |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 44 | return sbitmap_any_bit_set(&hctx->ctx_map); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 45 | } |
| 46 | |
| 47 | /* |
| 48 | * Mark this ctx as having pending work in this hardware queue |
| 49 | */ |
| 50 | static void blk_mq_hctx_mark_pending(struct blk_mq_hw_ctx *hctx, |
| 51 | struct blk_mq_ctx *ctx) |
| 52 | { |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 53 | if (!sbitmap_test_bit(&hctx->ctx_map, ctx->index_hw)) |
| 54 | sbitmap_set_bit(&hctx->ctx_map, ctx->index_hw); |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | static void blk_mq_hctx_clear_pending(struct blk_mq_hw_ctx *hctx, |
| 58 | struct blk_mq_ctx *ctx) |
| 59 | { |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 60 | sbitmap_clear_bit(&hctx->ctx_map, ctx->index_hw); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 61 | } |
| 62 | |
Keith Busch | b4c6a02 | 2014-12-19 17:54:14 -0700 | [diff] [blame] | 63 | void blk_mq_freeze_queue_start(struct request_queue *q) |
Ming Lei | 43a5e4e | 2013-12-26 21:31:35 +0800 | [diff] [blame] | 64 | { |
Christoph Hellwig | 4ecd4fe | 2015-05-07 09:38:13 +0200 | [diff] [blame] | 65 | int freeze_depth; |
Tejun Heo | cddd5d1 | 2014-08-16 08:02:24 -0400 | [diff] [blame] | 66 | |
Christoph Hellwig | 4ecd4fe | 2015-05-07 09:38:13 +0200 | [diff] [blame] | 67 | freeze_depth = atomic_inc_return(&q->mq_freeze_depth); |
| 68 | if (freeze_depth == 1) { |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 69 | percpu_ref_kill(&q->q_usage_counter); |
Mike Snitzer | b94ec29 | 2015-03-11 23:56:38 -0400 | [diff] [blame] | 70 | blk_mq_run_hw_queues(q, false); |
Tejun Heo | cddd5d1 | 2014-08-16 08:02:24 -0400 | [diff] [blame] | 71 | } |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 72 | } |
Keith Busch | b4c6a02 | 2014-12-19 17:54:14 -0700 | [diff] [blame] | 73 | EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start); |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 74 | |
| 75 | static void blk_mq_freeze_queue_wait(struct request_queue *q) |
| 76 | { |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 77 | wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter)); |
Ming Lei | 43a5e4e | 2013-12-26 21:31:35 +0800 | [diff] [blame] | 78 | } |
| 79 | |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 80 | /* |
| 81 | * Guarantee no request is in use, so we can change any data structure of |
| 82 | * the queue afterward. |
| 83 | */ |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 84 | void blk_freeze_queue(struct request_queue *q) |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 85 | { |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 86 | /* |
| 87 | * In the !blk_mq case we are only calling this to kill the |
| 88 | * q_usage_counter, otherwise this increases the freeze depth |
| 89 | * and waits for it to return to zero. For this reason there is |
| 90 | * no blk_unfreeze_queue(), and blk_freeze_queue() is not |
| 91 | * exported to drivers as the only user for unfreeze is blk_mq. |
| 92 | */ |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 93 | blk_mq_freeze_queue_start(q); |
| 94 | blk_mq_freeze_queue_wait(q); |
| 95 | } |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 96 | |
| 97 | void blk_mq_freeze_queue(struct request_queue *q) |
| 98 | { |
| 99 | /* |
| 100 | * ...just an alias to keep freeze and unfreeze actions balanced |
| 101 | * in the blk_mq_* namespace |
| 102 | */ |
| 103 | blk_freeze_queue(q); |
| 104 | } |
Jens Axboe | c761d96 | 2015-01-02 15:05:12 -0700 | [diff] [blame] | 105 | EXPORT_SYMBOL_GPL(blk_mq_freeze_queue); |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 106 | |
Keith Busch | b4c6a02 | 2014-12-19 17:54:14 -0700 | [diff] [blame] | 107 | void blk_mq_unfreeze_queue(struct request_queue *q) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 108 | { |
Christoph Hellwig | 4ecd4fe | 2015-05-07 09:38:13 +0200 | [diff] [blame] | 109 | int freeze_depth; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 110 | |
Christoph Hellwig | 4ecd4fe | 2015-05-07 09:38:13 +0200 | [diff] [blame] | 111 | freeze_depth = atomic_dec_return(&q->mq_freeze_depth); |
| 112 | WARN_ON_ONCE(freeze_depth < 0); |
| 113 | if (!freeze_depth) { |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 114 | percpu_ref_reinit(&q->q_usage_counter); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 115 | wake_up_all(&q->mq_freeze_wq); |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 116 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 117 | } |
Keith Busch | b4c6a02 | 2014-12-19 17:54:14 -0700 | [diff] [blame] | 118 | EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 119 | |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 120 | /** |
| 121 | * blk_mq_quiesce_queue() - wait until all ongoing queue_rq calls have finished |
| 122 | * @q: request queue. |
| 123 | * |
| 124 | * Note: this function does not prevent that the struct request end_io() |
| 125 | * callback function is invoked. Additionally, it is not prevented that |
| 126 | * new queue_rq() calls occur unless the queue has been stopped first. |
| 127 | */ |
| 128 | void blk_mq_quiesce_queue(struct request_queue *q) |
| 129 | { |
| 130 | struct blk_mq_hw_ctx *hctx; |
| 131 | unsigned int i; |
| 132 | bool rcu = false; |
| 133 | |
| 134 | blk_mq_stop_hw_queues(q); |
| 135 | |
| 136 | queue_for_each_hw_ctx(q, hctx, i) { |
| 137 | if (hctx->flags & BLK_MQ_F_BLOCKING) |
| 138 | synchronize_srcu(&hctx->queue_rq_srcu); |
| 139 | else |
| 140 | rcu = true; |
| 141 | } |
| 142 | if (rcu) |
| 143 | synchronize_rcu(); |
| 144 | } |
| 145 | EXPORT_SYMBOL_GPL(blk_mq_quiesce_queue); |
| 146 | |
Jens Axboe | aed3ea9 | 2014-12-22 14:04:42 -0700 | [diff] [blame] | 147 | void blk_mq_wake_waiters(struct request_queue *q) |
| 148 | { |
| 149 | struct blk_mq_hw_ctx *hctx; |
| 150 | unsigned int i; |
| 151 | |
| 152 | queue_for_each_hw_ctx(q, hctx, i) |
| 153 | if (blk_mq_hw_queue_mapped(hctx)) |
| 154 | blk_mq_tag_wakeup_all(hctx->tags, true); |
Keith Busch | 3fd5940 | 2015-01-08 08:53:56 -0700 | [diff] [blame] | 155 | |
| 156 | /* |
| 157 | * If we are called because the queue has now been marked as |
| 158 | * dying, we need to ensure that processes currently waiting on |
| 159 | * the queue are notified as well. |
| 160 | */ |
| 161 | wake_up_all(&q->mq_freeze_wq); |
Jens Axboe | aed3ea9 | 2014-12-22 14:04:42 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 164 | bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx) |
| 165 | { |
| 166 | return blk_mq_has_free_tags(hctx->tags); |
| 167 | } |
| 168 | EXPORT_SYMBOL(blk_mq_can_queue); |
| 169 | |
Jens Axboe | 94eddfb | 2013-11-19 09:25:07 -0700 | [diff] [blame] | 170 | static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 171 | struct request *rq, unsigned int op) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 172 | { |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 173 | INIT_LIST_HEAD(&rq->queuelist); |
| 174 | /* csd/requeue_work/fifo_time is initialized before use */ |
| 175 | rq->q = q; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 176 | rq->mq_ctx = ctx; |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 177 | rq->cmd_flags = op; |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame] | 178 | if (blk_queue_io_stat(q)) |
| 179 | rq->rq_flags |= RQF_IO_STAT; |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 180 | /* do not touch atomic flags, it needs atomic ops against the timer */ |
| 181 | rq->cpu = -1; |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 182 | INIT_HLIST_NODE(&rq->hash); |
| 183 | RB_CLEAR_NODE(&rq->rb_node); |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 184 | rq->rq_disk = NULL; |
| 185 | rq->part = NULL; |
Jens Axboe | 3ee3237 | 2014-06-09 09:36:53 -0600 | [diff] [blame] | 186 | rq->start_time = jiffies; |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 187 | #ifdef CONFIG_BLK_CGROUP |
| 188 | rq->rl = NULL; |
Ming Lei | 0fec08b | 2014-01-03 10:00:08 -0700 | [diff] [blame] | 189 | set_start_time_ns(rq); |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 190 | rq->io_start_time_ns = 0; |
| 191 | #endif |
| 192 | rq->nr_phys_segments = 0; |
| 193 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 194 | rq->nr_integrity_segments = 0; |
| 195 | #endif |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 196 | rq->special = NULL; |
| 197 | /* tag was already set */ |
| 198 | rq->errors = 0; |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 199 | |
Tony Battersby | 6f4a1626 | 2014-08-22 15:53:39 -0400 | [diff] [blame] | 200 | rq->cmd = rq->__cmd; |
| 201 | |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 202 | rq->extra_len = 0; |
| 203 | rq->sense_len = 0; |
| 204 | rq->resid_len = 0; |
| 205 | rq->sense = NULL; |
| 206 | |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 207 | INIT_LIST_HEAD(&rq->timeout_list); |
Jens Axboe | f6be4fb | 2014-06-06 11:03:48 -0600 | [diff] [blame] | 208 | rq->timeout = 0; |
| 209 | |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 210 | rq->end_io = NULL; |
| 211 | rq->end_io_data = NULL; |
| 212 | rq->next_rq = NULL; |
| 213 | |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 214 | ctx->rq_dispatched[op_is_sync(op)]++; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 215 | } |
| 216 | |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 217 | static struct request * |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 218 | __blk_mq_alloc_request(struct blk_mq_alloc_data *data, unsigned int op) |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 219 | { |
| 220 | struct request *rq; |
| 221 | unsigned int tag; |
| 222 | |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 223 | tag = blk_mq_get_tag(data); |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 224 | if (tag != BLK_MQ_TAG_FAIL) { |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 225 | rq = data->hctx->tags->rqs[tag]; |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 226 | |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 227 | if (blk_mq_tag_busy(data->hctx)) { |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame] | 228 | rq->rq_flags = RQF_MQ_INFLIGHT; |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 229 | atomic_inc(&data->hctx->nr_active); |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | rq->tag = tag; |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 233 | blk_mq_rq_ctx_init(data->q, data->ctx, rq, op); |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 234 | return rq; |
| 235 | } |
| 236 | |
| 237 | return NULL; |
| 238 | } |
| 239 | |
Christoph Hellwig | 6f3b0e8 | 2015-11-26 09:13:05 +0100 | [diff] [blame] | 240 | struct request *blk_mq_alloc_request(struct request_queue *q, int rw, |
| 241 | unsigned int flags) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 242 | { |
Christoph Hellwig | d852564 | 2014-05-27 20:59:50 +0200 | [diff] [blame] | 243 | struct blk_mq_ctx *ctx; |
| 244 | struct blk_mq_hw_ctx *hctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 245 | struct request *rq; |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 246 | struct blk_mq_alloc_data alloc_data; |
Joe Lawrence | a492f07 | 2014-08-28 08:15:21 -0600 | [diff] [blame] | 247 | int ret; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 248 | |
Christoph Hellwig | 6f3b0e8 | 2015-11-26 09:13:05 +0100 | [diff] [blame] | 249 | ret = blk_queue_enter(q, flags & BLK_MQ_REQ_NOWAIT); |
Joe Lawrence | a492f07 | 2014-08-28 08:15:21 -0600 | [diff] [blame] | 250 | if (ret) |
| 251 | return ERR_PTR(ret); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 252 | |
Christoph Hellwig | d852564 | 2014-05-27 20:59:50 +0200 | [diff] [blame] | 253 | ctx = blk_mq_get_ctx(q); |
Christoph Hellwig | 7d7e0f9 | 2016-09-14 16:18:54 +0200 | [diff] [blame] | 254 | hctx = blk_mq_map_queue(q, ctx->cpu); |
Christoph Hellwig | 6f3b0e8 | 2015-11-26 09:13:05 +0100 | [diff] [blame] | 255 | blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx); |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 256 | rq = __blk_mq_alloc_request(&alloc_data, rw); |
Christoph Hellwig | d852564 | 2014-05-27 20:59:50 +0200 | [diff] [blame] | 257 | blk_mq_put_ctx(ctx); |
Jens Axboe | 841bac2 | 2016-09-21 10:08:43 -0600 | [diff] [blame] | 258 | |
Keith Busch | c76541a | 2014-12-19 17:54:13 -0700 | [diff] [blame] | 259 | if (!rq) { |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 260 | blk_queue_exit(q); |
Joe Lawrence | a492f07 | 2014-08-28 08:15:21 -0600 | [diff] [blame] | 261 | return ERR_PTR(-EWOULDBLOCK); |
Keith Busch | c76541a | 2014-12-19 17:54:13 -0700 | [diff] [blame] | 262 | } |
Christoph Hellwig | 0c4de0f | 2016-07-19 11:31:50 +0200 | [diff] [blame] | 263 | |
| 264 | rq->__data_len = 0; |
| 265 | rq->__sector = (sector_t) -1; |
| 266 | rq->bio = rq->biotail = NULL; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 267 | return rq; |
| 268 | } |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 269 | EXPORT_SYMBOL(blk_mq_alloc_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 270 | |
Ming Lin | 1f5bd33 | 2016-06-13 16:45:21 +0200 | [diff] [blame] | 271 | struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int rw, |
| 272 | unsigned int flags, unsigned int hctx_idx) |
| 273 | { |
| 274 | struct blk_mq_hw_ctx *hctx; |
| 275 | struct blk_mq_ctx *ctx; |
| 276 | struct request *rq; |
| 277 | struct blk_mq_alloc_data alloc_data; |
| 278 | int ret; |
| 279 | |
| 280 | /* |
| 281 | * If the tag allocator sleeps we could get an allocation for a |
| 282 | * different hardware context. No need to complicate the low level |
| 283 | * allocator for this for the rare use case of a command tied to |
| 284 | * a specific queue. |
| 285 | */ |
| 286 | if (WARN_ON_ONCE(!(flags & BLK_MQ_REQ_NOWAIT))) |
| 287 | return ERR_PTR(-EINVAL); |
| 288 | |
| 289 | if (hctx_idx >= q->nr_hw_queues) |
| 290 | return ERR_PTR(-EIO); |
| 291 | |
| 292 | ret = blk_queue_enter(q, true); |
| 293 | if (ret) |
| 294 | return ERR_PTR(ret); |
| 295 | |
Christoph Hellwig | c8712c6 | 2016-09-23 10:25:48 -0600 | [diff] [blame] | 296 | /* |
| 297 | * Check if the hardware context is actually mapped to anything. |
| 298 | * If not tell the caller that it should skip this queue. |
| 299 | */ |
Ming Lin | 1f5bd33 | 2016-06-13 16:45:21 +0200 | [diff] [blame] | 300 | hctx = q->queue_hw_ctx[hctx_idx]; |
Christoph Hellwig | c8712c6 | 2016-09-23 10:25:48 -0600 | [diff] [blame] | 301 | if (!blk_mq_hw_queue_mapped(hctx)) { |
| 302 | ret = -EXDEV; |
| 303 | goto out_queue_exit; |
| 304 | } |
Ming Lin | 1f5bd33 | 2016-06-13 16:45:21 +0200 | [diff] [blame] | 305 | ctx = __blk_mq_get_ctx(q, cpumask_first(hctx->cpumask)); |
| 306 | |
| 307 | blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx); |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 308 | rq = __blk_mq_alloc_request(&alloc_data, rw); |
Ming Lin | 1f5bd33 | 2016-06-13 16:45:21 +0200 | [diff] [blame] | 309 | if (!rq) { |
Christoph Hellwig | c8712c6 | 2016-09-23 10:25:48 -0600 | [diff] [blame] | 310 | ret = -EWOULDBLOCK; |
| 311 | goto out_queue_exit; |
Ming Lin | 1f5bd33 | 2016-06-13 16:45:21 +0200 | [diff] [blame] | 312 | } |
| 313 | |
| 314 | return rq; |
Christoph Hellwig | c8712c6 | 2016-09-23 10:25:48 -0600 | [diff] [blame] | 315 | |
| 316 | out_queue_exit: |
| 317 | blk_queue_exit(q); |
| 318 | return ERR_PTR(ret); |
Ming Lin | 1f5bd33 | 2016-06-13 16:45:21 +0200 | [diff] [blame] | 319 | } |
| 320 | EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx); |
| 321 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 322 | static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, |
| 323 | struct blk_mq_ctx *ctx, struct request *rq) |
| 324 | { |
| 325 | const int tag = rq->tag; |
| 326 | struct request_queue *q = rq->q; |
| 327 | |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame] | 328 | if (rq->rq_flags & RQF_MQ_INFLIGHT) |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 329 | atomic_dec(&hctx->nr_active); |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 330 | |
| 331 | wbt_done(q->rq_wb, &rq->issue_stat); |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame] | 332 | rq->rq_flags = 0; |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 333 | |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 334 | clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags); |
Omar Sandoval | 40aabb6 | 2016-09-17 01:28:23 -0700 | [diff] [blame] | 335 | blk_mq_put_tag(hctx, ctx, tag); |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 336 | blk_queue_exit(q); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 337 | } |
| 338 | |
Jens Axboe | 7c7f2f2 | 2014-11-17 10:41:57 -0700 | [diff] [blame] | 339 | void blk_mq_free_hctx_request(struct blk_mq_hw_ctx *hctx, struct request *rq) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 340 | { |
| 341 | struct blk_mq_ctx *ctx = rq->mq_ctx; |
Jens Axboe | 7c7f2f2 | 2014-11-17 10:41:57 -0700 | [diff] [blame] | 342 | |
| 343 | ctx->rq_completed[rq_is_sync(rq)]++; |
| 344 | __blk_mq_free_request(hctx, ctx, rq); |
| 345 | |
| 346 | } |
| 347 | EXPORT_SYMBOL_GPL(blk_mq_free_hctx_request); |
| 348 | |
| 349 | void blk_mq_free_request(struct request *rq) |
| 350 | { |
Christoph Hellwig | 7d7e0f9 | 2016-09-14 16:18:54 +0200 | [diff] [blame] | 351 | blk_mq_free_hctx_request(blk_mq_map_queue(rq->q, rq->mq_ctx->cpu), rq); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 352 | } |
Jens Axboe | 1a3b595 | 2014-11-17 10:40:48 -0700 | [diff] [blame] | 353 | EXPORT_SYMBOL_GPL(blk_mq_free_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 354 | |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 355 | inline void __blk_mq_end_request(struct request *rq, int error) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 356 | { |
Ming Lei | 0d11e6a | 2013-12-05 10:50:39 -0700 | [diff] [blame] | 357 | blk_account_io_done(rq); |
| 358 | |
Christoph Hellwig | 91b6363 | 2014-04-16 09:44:53 +0200 | [diff] [blame] | 359 | if (rq->end_io) { |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 360 | wbt_done(rq->q->rq_wb, &rq->issue_stat); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 361 | rq->end_io(rq, error); |
Christoph Hellwig | 91b6363 | 2014-04-16 09:44:53 +0200 | [diff] [blame] | 362 | } else { |
| 363 | if (unlikely(blk_bidi_rq(rq))) |
| 364 | blk_mq_free_request(rq->next_rq); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 365 | blk_mq_free_request(rq); |
Christoph Hellwig | 91b6363 | 2014-04-16 09:44:53 +0200 | [diff] [blame] | 366 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 367 | } |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 368 | EXPORT_SYMBOL(__blk_mq_end_request); |
Christoph Hellwig | 63151a4 | 2014-04-16 09:44:52 +0200 | [diff] [blame] | 369 | |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 370 | void blk_mq_end_request(struct request *rq, int error) |
Christoph Hellwig | 63151a4 | 2014-04-16 09:44:52 +0200 | [diff] [blame] | 371 | { |
| 372 | if (blk_update_request(rq, error, blk_rq_bytes(rq))) |
| 373 | BUG(); |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 374 | __blk_mq_end_request(rq, error); |
Christoph Hellwig | 63151a4 | 2014-04-16 09:44:52 +0200 | [diff] [blame] | 375 | } |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 376 | EXPORT_SYMBOL(blk_mq_end_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 377 | |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 378 | static void __blk_mq_complete_request_remote(void *data) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 379 | { |
Christoph Hellwig | 3d6efbf | 2014-01-08 09:33:37 -0800 | [diff] [blame] | 380 | struct request *rq = data; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 381 | |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 382 | rq->q->softirq_done_fn(rq); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 383 | } |
| 384 | |
Jens Axboe | ed85186 | 2014-05-30 21:20:50 -0600 | [diff] [blame] | 385 | static void blk_mq_ipi_complete_request(struct request *rq) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 386 | { |
| 387 | struct blk_mq_ctx *ctx = rq->mq_ctx; |
Christoph Hellwig | 3853520 | 2014-04-25 02:32:53 -0700 | [diff] [blame] | 388 | bool shared = false; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 389 | int cpu; |
| 390 | |
Christoph Hellwig | 3853520 | 2014-04-25 02:32:53 -0700 | [diff] [blame] | 391 | if (!test_bit(QUEUE_FLAG_SAME_COMP, &rq->q->queue_flags)) { |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 392 | rq->q->softirq_done_fn(rq); |
| 393 | return; |
| 394 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 395 | |
| 396 | cpu = get_cpu(); |
Christoph Hellwig | 3853520 | 2014-04-25 02:32:53 -0700 | [diff] [blame] | 397 | if (!test_bit(QUEUE_FLAG_SAME_FORCE, &rq->q->queue_flags)) |
| 398 | shared = cpus_share_cache(cpu, ctx->cpu); |
| 399 | |
| 400 | if (cpu != ctx->cpu && !shared && cpu_online(ctx->cpu)) { |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 401 | rq->csd.func = __blk_mq_complete_request_remote; |
Christoph Hellwig | 3d6efbf | 2014-01-08 09:33:37 -0800 | [diff] [blame] | 402 | rq->csd.info = rq; |
| 403 | rq->csd.flags = 0; |
Frederic Weisbecker | c46fff2 | 2014-02-24 16:40:02 +0100 | [diff] [blame] | 404 | smp_call_function_single_async(ctx->cpu, &rq->csd); |
Christoph Hellwig | 3d6efbf | 2014-01-08 09:33:37 -0800 | [diff] [blame] | 405 | } else { |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 406 | rq->q->softirq_done_fn(rq); |
Christoph Hellwig | 3d6efbf | 2014-01-08 09:33:37 -0800 | [diff] [blame] | 407 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 408 | put_cpu(); |
| 409 | } |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 410 | |
Jens Axboe | cf43e6b | 2016-11-07 21:32:37 -0700 | [diff] [blame] | 411 | static void blk_mq_stat_add(struct request *rq) |
| 412 | { |
| 413 | if (rq->rq_flags & RQF_STATS) { |
| 414 | /* |
| 415 | * We could rq->mq_ctx here, but there's less of a risk |
| 416 | * of races if we have the completion event add the stats |
| 417 | * to the local software queue. |
| 418 | */ |
| 419 | struct blk_mq_ctx *ctx; |
| 420 | |
| 421 | ctx = __blk_mq_get_ctx(rq->q, raw_smp_processor_id()); |
| 422 | blk_stat_add(&ctx->stat[rq_data_dir(rq)], rq); |
| 423 | } |
| 424 | } |
| 425 | |
Jens Axboe | 1fa8cc5 | 2015-11-05 14:32:55 -0700 | [diff] [blame] | 426 | static void __blk_mq_complete_request(struct request *rq) |
Jens Axboe | ed85186 | 2014-05-30 21:20:50 -0600 | [diff] [blame] | 427 | { |
| 428 | struct request_queue *q = rq->q; |
| 429 | |
Jens Axboe | cf43e6b | 2016-11-07 21:32:37 -0700 | [diff] [blame] | 430 | blk_mq_stat_add(rq); |
| 431 | |
Jens Axboe | ed85186 | 2014-05-30 21:20:50 -0600 | [diff] [blame] | 432 | if (!q->softirq_done_fn) |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 433 | blk_mq_end_request(rq, rq->errors); |
Jens Axboe | ed85186 | 2014-05-30 21:20:50 -0600 | [diff] [blame] | 434 | else |
| 435 | blk_mq_ipi_complete_request(rq); |
| 436 | } |
| 437 | |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 438 | /** |
| 439 | * blk_mq_complete_request - end I/O on a request |
| 440 | * @rq: the request being processed |
| 441 | * |
| 442 | * Description: |
| 443 | * Ends all I/O on a request. It does not handle partial completions. |
| 444 | * The actual completion happens out-of-order, through a IPI handler. |
| 445 | **/ |
Christoph Hellwig | f4829a9 | 2015-09-27 21:01:50 +0200 | [diff] [blame] | 446 | void blk_mq_complete_request(struct request *rq, int error) |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 447 | { |
Jens Axboe | 95f0968 | 2014-05-27 17:46:48 -0600 | [diff] [blame] | 448 | struct request_queue *q = rq->q; |
| 449 | |
| 450 | if (unlikely(blk_should_fake_timeout(q))) |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 451 | return; |
Christoph Hellwig | f4829a9 | 2015-09-27 21:01:50 +0200 | [diff] [blame] | 452 | if (!blk_mark_rq_complete(rq)) { |
| 453 | rq->errors = error; |
Jens Axboe | ed85186 | 2014-05-30 21:20:50 -0600 | [diff] [blame] | 454 | __blk_mq_complete_request(rq); |
Christoph Hellwig | f4829a9 | 2015-09-27 21:01:50 +0200 | [diff] [blame] | 455 | } |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 456 | } |
| 457 | EXPORT_SYMBOL(blk_mq_complete_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 458 | |
Keith Busch | 973c019 | 2015-01-07 18:55:43 -0700 | [diff] [blame] | 459 | int blk_mq_request_started(struct request *rq) |
| 460 | { |
| 461 | return test_bit(REQ_ATOM_STARTED, &rq->atomic_flags); |
| 462 | } |
| 463 | EXPORT_SYMBOL_GPL(blk_mq_request_started); |
| 464 | |
Christoph Hellwig | e249007 | 2014-09-13 16:40:09 -0700 | [diff] [blame] | 465 | void blk_mq_start_request(struct request *rq) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 466 | { |
| 467 | struct request_queue *q = rq->q; |
| 468 | |
| 469 | trace_block_rq_issue(q, rq); |
| 470 | |
Christoph Hellwig | 742ee69 | 2014-04-14 10:30:06 +0200 | [diff] [blame] | 471 | rq->resid_len = blk_rq_bytes(rq); |
Christoph Hellwig | 91b6363 | 2014-04-16 09:44:53 +0200 | [diff] [blame] | 472 | if (unlikely(blk_bidi_rq(rq))) |
| 473 | rq->next_rq->resid_len = blk_rq_bytes(rq->next_rq); |
Christoph Hellwig | 742ee69 | 2014-04-14 10:30:06 +0200 | [diff] [blame] | 474 | |
Jens Axboe | cf43e6b | 2016-11-07 21:32:37 -0700 | [diff] [blame] | 475 | if (test_bit(QUEUE_FLAG_STATS, &q->queue_flags)) { |
| 476 | blk_stat_set_issue_time(&rq->issue_stat); |
| 477 | rq->rq_flags |= RQF_STATS; |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 478 | wbt_issue(q->rq_wb, &rq->issue_stat); |
Jens Axboe | cf43e6b | 2016-11-07 21:32:37 -0700 | [diff] [blame] | 479 | } |
| 480 | |
Ming Lei | 2b8393b | 2014-06-10 00:16:41 +0800 | [diff] [blame] | 481 | blk_add_timer(rq); |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 482 | |
| 483 | /* |
Jens Axboe | 538b753 | 2014-09-16 10:37:37 -0600 | [diff] [blame] | 484 | * Ensure that ->deadline is visible before set the started |
| 485 | * flag and clear the completed flag. |
| 486 | */ |
| 487 | smp_mb__before_atomic(); |
| 488 | |
| 489 | /* |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 490 | * Mark us as started and clear complete. Complete might have been |
| 491 | * set if requeue raced with timeout, which then marked it as |
| 492 | * complete. So be sure to clear complete again when we start |
| 493 | * the request, otherwise we'll ignore the completion event. |
| 494 | */ |
Jens Axboe | 4b57052 | 2014-05-29 11:00:11 -0600 | [diff] [blame] | 495 | if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) |
| 496 | set_bit(REQ_ATOM_STARTED, &rq->atomic_flags); |
| 497 | if (test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) |
| 498 | clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); |
Christoph Hellwig | 49f5baa | 2014-02-11 08:27:14 -0800 | [diff] [blame] | 499 | |
| 500 | if (q->dma_drain_size && blk_rq_bytes(rq)) { |
| 501 | /* |
| 502 | * Make sure space for the drain appears. We know we can do |
| 503 | * this because max_hw_segments has been adjusted to be one |
| 504 | * fewer than the device can handle. |
| 505 | */ |
| 506 | rq->nr_phys_segments++; |
| 507 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 508 | } |
Christoph Hellwig | e249007 | 2014-09-13 16:40:09 -0700 | [diff] [blame] | 509 | EXPORT_SYMBOL(blk_mq_start_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 510 | |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 511 | static void __blk_mq_requeue_request(struct request *rq) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 512 | { |
| 513 | struct request_queue *q = rq->q; |
| 514 | |
| 515 | trace_block_rq_requeue(q, rq); |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 516 | wbt_requeue(q->rq_wb, &rq->issue_stat); |
Christoph Hellwig | 49f5baa | 2014-02-11 08:27:14 -0800 | [diff] [blame] | 517 | |
Christoph Hellwig | e249007 | 2014-09-13 16:40:09 -0700 | [diff] [blame] | 518 | if (test_and_clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) { |
| 519 | if (q->dma_drain_size && blk_rq_bytes(rq)) |
| 520 | rq->nr_phys_segments--; |
| 521 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 522 | } |
| 523 | |
Bart Van Assche | 2b053ac | 2016-10-28 17:21:41 -0700 | [diff] [blame] | 524 | void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list) |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 525 | { |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 526 | __blk_mq_requeue_request(rq); |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 527 | |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 528 | BUG_ON(blk_queued_rq(rq)); |
Bart Van Assche | 2b053ac | 2016-10-28 17:21:41 -0700 | [diff] [blame] | 529 | blk_mq_add_to_requeue_list(rq, true, kick_requeue_list); |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 530 | } |
| 531 | EXPORT_SYMBOL(blk_mq_requeue_request); |
| 532 | |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 533 | static void blk_mq_requeue_work(struct work_struct *work) |
| 534 | { |
| 535 | struct request_queue *q = |
Mike Snitzer | 2849450 | 2016-09-14 13:28:30 -0400 | [diff] [blame] | 536 | container_of(work, struct request_queue, requeue_work.work); |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 537 | LIST_HEAD(rq_list); |
| 538 | struct request *rq, *next; |
| 539 | unsigned long flags; |
| 540 | |
| 541 | spin_lock_irqsave(&q->requeue_lock, flags); |
| 542 | list_splice_init(&q->requeue_list, &rq_list); |
| 543 | spin_unlock_irqrestore(&q->requeue_lock, flags); |
| 544 | |
| 545 | list_for_each_entry_safe(rq, next, &rq_list, queuelist) { |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame] | 546 | if (!(rq->rq_flags & RQF_SOFTBARRIER)) |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 547 | continue; |
| 548 | |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame] | 549 | rq->rq_flags &= ~RQF_SOFTBARRIER; |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 550 | list_del_init(&rq->queuelist); |
| 551 | blk_mq_insert_request(rq, true, false, false); |
| 552 | } |
| 553 | |
| 554 | while (!list_empty(&rq_list)) { |
| 555 | rq = list_entry(rq_list.next, struct request, queuelist); |
| 556 | list_del_init(&rq->queuelist); |
| 557 | blk_mq_insert_request(rq, false, false, false); |
| 558 | } |
| 559 | |
Bart Van Assche | 52d7f1b | 2016-10-28 17:20:32 -0700 | [diff] [blame] | 560 | blk_mq_run_hw_queues(q, false); |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 561 | } |
| 562 | |
Bart Van Assche | 2b053ac | 2016-10-28 17:21:41 -0700 | [diff] [blame] | 563 | void blk_mq_add_to_requeue_list(struct request *rq, bool at_head, |
| 564 | bool kick_requeue_list) |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 565 | { |
| 566 | struct request_queue *q = rq->q; |
| 567 | unsigned long flags; |
| 568 | |
| 569 | /* |
| 570 | * We abuse this flag that is otherwise used by the I/O scheduler to |
| 571 | * request head insertation from the workqueue. |
| 572 | */ |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame] | 573 | BUG_ON(rq->rq_flags & RQF_SOFTBARRIER); |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 574 | |
| 575 | spin_lock_irqsave(&q->requeue_lock, flags); |
| 576 | if (at_head) { |
Christoph Hellwig | e806402 | 2016-10-20 15:12:13 +0200 | [diff] [blame] | 577 | rq->rq_flags |= RQF_SOFTBARRIER; |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 578 | list_add(&rq->queuelist, &q->requeue_list); |
| 579 | } else { |
| 580 | list_add_tail(&rq->queuelist, &q->requeue_list); |
| 581 | } |
| 582 | spin_unlock_irqrestore(&q->requeue_lock, flags); |
Bart Van Assche | 2b053ac | 2016-10-28 17:21:41 -0700 | [diff] [blame] | 583 | |
| 584 | if (kick_requeue_list) |
| 585 | blk_mq_kick_requeue_list(q); |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 586 | } |
| 587 | EXPORT_SYMBOL(blk_mq_add_to_requeue_list); |
| 588 | |
| 589 | void blk_mq_kick_requeue_list(struct request_queue *q) |
| 590 | { |
Mike Snitzer | 2849450 | 2016-09-14 13:28:30 -0400 | [diff] [blame] | 591 | kblockd_schedule_delayed_work(&q->requeue_work, 0); |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 592 | } |
| 593 | EXPORT_SYMBOL(blk_mq_kick_requeue_list); |
| 594 | |
Mike Snitzer | 2849450 | 2016-09-14 13:28:30 -0400 | [diff] [blame] | 595 | void blk_mq_delay_kick_requeue_list(struct request_queue *q, |
| 596 | unsigned long msecs) |
| 597 | { |
| 598 | kblockd_schedule_delayed_work(&q->requeue_work, |
| 599 | msecs_to_jiffies(msecs)); |
| 600 | } |
| 601 | EXPORT_SYMBOL(blk_mq_delay_kick_requeue_list); |
| 602 | |
Jens Axboe | 1885b24 | 2015-01-07 18:55:45 -0700 | [diff] [blame] | 603 | void blk_mq_abort_requeue_list(struct request_queue *q) |
| 604 | { |
| 605 | unsigned long flags; |
| 606 | LIST_HEAD(rq_list); |
| 607 | |
| 608 | spin_lock_irqsave(&q->requeue_lock, flags); |
| 609 | list_splice_init(&q->requeue_list, &rq_list); |
| 610 | spin_unlock_irqrestore(&q->requeue_lock, flags); |
| 611 | |
| 612 | while (!list_empty(&rq_list)) { |
| 613 | struct request *rq; |
| 614 | |
| 615 | rq = list_first_entry(&rq_list, struct request, queuelist); |
| 616 | list_del_init(&rq->queuelist); |
| 617 | rq->errors = -EIO; |
| 618 | blk_mq_end_request(rq, rq->errors); |
| 619 | } |
| 620 | } |
| 621 | EXPORT_SYMBOL(blk_mq_abort_requeue_list); |
| 622 | |
Jens Axboe | 0e62f51 | 2014-06-04 10:23:49 -0600 | [diff] [blame] | 623 | struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag) |
| 624 | { |
Jens Axboe | 88c7b2b | 2016-08-25 08:07:30 -0600 | [diff] [blame] | 625 | if (tag < tags->nr_tags) { |
| 626 | prefetch(tags->rqs[tag]); |
Hannes Reinecke | 4ee86ba | 2016-03-15 12:03:28 -0700 | [diff] [blame] | 627 | return tags->rqs[tag]; |
Jens Axboe | 88c7b2b | 2016-08-25 08:07:30 -0600 | [diff] [blame] | 628 | } |
Hannes Reinecke | 4ee86ba | 2016-03-15 12:03:28 -0700 | [diff] [blame] | 629 | |
| 630 | return NULL; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 631 | } |
| 632 | EXPORT_SYMBOL(blk_mq_tag_to_rq); |
| 633 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 634 | struct blk_mq_timeout_data { |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 635 | unsigned long next; |
| 636 | unsigned int next_set; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 637 | }; |
| 638 | |
Christoph Hellwig | 9041583 | 2014-09-22 10:21:48 -0600 | [diff] [blame] | 639 | void blk_mq_rq_timed_out(struct request *req, bool reserved) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 640 | { |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 641 | struct blk_mq_ops *ops = req->q->mq_ops; |
| 642 | enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER; |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 643 | |
| 644 | /* |
| 645 | * We know that complete is set at this point. If STARTED isn't set |
| 646 | * anymore, then the request isn't active and the "timeout" should |
| 647 | * just be ignored. This can happen due to the bitflag ordering. |
| 648 | * Timeout first checks if STARTED is set, and if it is, assumes |
| 649 | * the request is active. But if we race with completion, then |
| 650 | * we both flags will get cleared. So check here again, and ignore |
| 651 | * a timeout event with a request that isn't active. |
| 652 | */ |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 653 | if (!test_bit(REQ_ATOM_STARTED, &req->atomic_flags)) |
| 654 | return; |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 655 | |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 656 | if (ops->timeout) |
Christoph Hellwig | 0152fb6 | 2014-09-13 16:40:13 -0700 | [diff] [blame] | 657 | ret = ops->timeout(req, reserved); |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 658 | |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 659 | switch (ret) { |
| 660 | case BLK_EH_HANDLED: |
| 661 | __blk_mq_complete_request(req); |
| 662 | break; |
| 663 | case BLK_EH_RESET_TIMER: |
| 664 | blk_add_timer(req); |
| 665 | blk_clear_rq_complete(req); |
| 666 | break; |
| 667 | case BLK_EH_NOT_HANDLED: |
| 668 | break; |
| 669 | default: |
| 670 | printk(KERN_ERR "block: bad eh return: %d\n", ret); |
| 671 | break; |
| 672 | } |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 673 | } |
Keith Busch | 5b3f25f | 2015-01-07 18:55:46 -0700 | [diff] [blame] | 674 | |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 675 | static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx, |
| 676 | struct request *rq, void *priv, bool reserved) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 677 | { |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 678 | struct blk_mq_timeout_data *data = priv; |
| 679 | |
Keith Busch | eb130db | 2015-01-08 08:59:53 -0700 | [diff] [blame] | 680 | if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) { |
| 681 | /* |
| 682 | * If a request wasn't started before the queue was |
| 683 | * marked dying, kill it here or it'll go unnoticed. |
| 684 | */ |
Keith Busch | a59e0f5 | 2016-02-11 13:05:38 -0700 | [diff] [blame] | 685 | if (unlikely(blk_queue_dying(rq->q))) { |
| 686 | rq->errors = -EIO; |
| 687 | blk_mq_end_request(rq, rq->errors); |
| 688 | } |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 689 | return; |
Keith Busch | eb130db | 2015-01-08 08:59:53 -0700 | [diff] [blame] | 690 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 691 | |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 692 | if (time_after_eq(jiffies, rq->deadline)) { |
| 693 | if (!blk_mark_rq_complete(rq)) |
Christoph Hellwig | 0152fb6 | 2014-09-13 16:40:13 -0700 | [diff] [blame] | 694 | blk_mq_rq_timed_out(rq, reserved); |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 695 | } else if (!data->next_set || time_after(data->next, rq->deadline)) { |
| 696 | data->next = rq->deadline; |
| 697 | data->next_set = 1; |
| 698 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 699 | } |
| 700 | |
Christoph Hellwig | 287922eb | 2015-10-30 20:57:30 +0800 | [diff] [blame] | 701 | static void blk_mq_timeout_work(struct work_struct *work) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 702 | { |
Christoph Hellwig | 287922eb | 2015-10-30 20:57:30 +0800 | [diff] [blame] | 703 | struct request_queue *q = |
| 704 | container_of(work, struct request_queue, timeout_work); |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 705 | struct blk_mq_timeout_data data = { |
| 706 | .next = 0, |
| 707 | .next_set = 0, |
| 708 | }; |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 709 | int i; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 710 | |
Gabriel Krisman Bertazi | 71f79fb | 2016-08-01 08:23:39 -0600 | [diff] [blame] | 711 | /* A deadlock might occur if a request is stuck requiring a |
| 712 | * timeout at the same time a queue freeze is waiting |
| 713 | * completion, since the timeout code would not be able to |
| 714 | * acquire the queue reference here. |
| 715 | * |
| 716 | * That's why we don't use blk_queue_enter here; instead, we use |
| 717 | * percpu_ref_tryget directly, because we need to be able to |
| 718 | * obtain a reference even in the short window between the queue |
| 719 | * starting to freeze, by dropping the first reference in |
| 720 | * blk_mq_freeze_queue_start, and the moment the last request is |
| 721 | * consumed, marked by the instant q_usage_counter reaches |
| 722 | * zero. |
| 723 | */ |
| 724 | if (!percpu_ref_tryget(&q->q_usage_counter)) |
Christoph Hellwig | 287922eb | 2015-10-30 20:57:30 +0800 | [diff] [blame] | 725 | return; |
| 726 | |
Christoph Hellwig | 0bf6cd5 | 2015-09-27 21:01:51 +0200 | [diff] [blame] | 727 | blk_mq_queue_tag_busy_iter(q, blk_mq_check_expired, &data); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 728 | |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 729 | if (data.next_set) { |
| 730 | data.next = blk_rq_timeout(round_jiffies_up(data.next)); |
| 731 | mod_timer(&q->timeout, data.next); |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 732 | } else { |
Christoph Hellwig | 0bf6cd5 | 2015-09-27 21:01:51 +0200 | [diff] [blame] | 733 | struct blk_mq_hw_ctx *hctx; |
| 734 | |
Ming Lei | f054b56 | 2015-04-21 10:00:19 +0800 | [diff] [blame] | 735 | queue_for_each_hw_ctx(q, hctx, i) { |
| 736 | /* the hctx may be unmapped, so check it here */ |
| 737 | if (blk_mq_hw_queue_mapped(hctx)) |
| 738 | blk_mq_tag_idle(hctx); |
| 739 | } |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 740 | } |
Christoph Hellwig | 287922eb | 2015-10-30 20:57:30 +0800 | [diff] [blame] | 741 | blk_queue_exit(q); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 742 | } |
| 743 | |
| 744 | /* |
| 745 | * Reverse check our software queue for entries that we could potentially |
| 746 | * merge with. Currently includes a hand-wavy stop count of 8, to not spend |
| 747 | * too much time checking for merges. |
| 748 | */ |
| 749 | static bool blk_mq_attempt_merge(struct request_queue *q, |
| 750 | struct blk_mq_ctx *ctx, struct bio *bio) |
| 751 | { |
| 752 | struct request *rq; |
| 753 | int checked = 8; |
| 754 | |
| 755 | list_for_each_entry_reverse(rq, &ctx->rq_list, queuelist) { |
| 756 | int el_ret; |
| 757 | |
| 758 | if (!checked--) |
| 759 | break; |
| 760 | |
| 761 | if (!blk_rq_merge_ok(rq, bio)) |
| 762 | continue; |
| 763 | |
| 764 | el_ret = blk_try_merge(rq, bio); |
| 765 | if (el_ret == ELEVATOR_BACK_MERGE) { |
| 766 | if (bio_attempt_back_merge(q, rq, bio)) { |
| 767 | ctx->rq_merged++; |
| 768 | return true; |
| 769 | } |
| 770 | break; |
| 771 | } else if (el_ret == ELEVATOR_FRONT_MERGE) { |
| 772 | if (bio_attempt_front_merge(q, rq, bio)) { |
| 773 | ctx->rq_merged++; |
| 774 | return true; |
| 775 | } |
| 776 | break; |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | return false; |
| 781 | } |
| 782 | |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 783 | struct flush_busy_ctx_data { |
| 784 | struct blk_mq_hw_ctx *hctx; |
| 785 | struct list_head *list; |
| 786 | }; |
| 787 | |
| 788 | static bool flush_busy_ctx(struct sbitmap *sb, unsigned int bitnr, void *data) |
| 789 | { |
| 790 | struct flush_busy_ctx_data *flush_data = data; |
| 791 | struct blk_mq_hw_ctx *hctx = flush_data->hctx; |
| 792 | struct blk_mq_ctx *ctx = hctx->ctxs[bitnr]; |
| 793 | |
| 794 | sbitmap_clear_bit(sb, bitnr); |
| 795 | spin_lock(&ctx->lock); |
| 796 | list_splice_tail_init(&ctx->rq_list, flush_data->list); |
| 797 | spin_unlock(&ctx->lock); |
| 798 | return true; |
| 799 | } |
| 800 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 801 | /* |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 802 | * Process software queues that have been marked busy, splicing them |
| 803 | * to the for-dispatch |
| 804 | */ |
| 805 | static void flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list) |
| 806 | { |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 807 | struct flush_busy_ctx_data data = { |
| 808 | .hctx = hctx, |
| 809 | .list = list, |
| 810 | }; |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 811 | |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 812 | sbitmap_for_each_set(&hctx->ctx_map, flush_busy_ctx, &data); |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 813 | } |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 814 | |
Jens Axboe | 703fd1c | 2016-09-16 13:59:14 -0600 | [diff] [blame] | 815 | static inline unsigned int queued_to_index(unsigned int queued) |
| 816 | { |
| 817 | if (!queued) |
| 818 | return 0; |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 819 | |
Jens Axboe | 703fd1c | 2016-09-16 13:59:14 -0600 | [diff] [blame] | 820 | return min(BLK_MQ_MAX_DISPATCH_ORDER - 1, ilog2(queued) + 1); |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 821 | } |
| 822 | |
| 823 | /* |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 824 | * Run this hardware queue, pulling any software queues mapped to it in. |
| 825 | * Note that this function currently has various problems around ordering |
| 826 | * of IO. In particular, we'd like FIFO behaviour on handling existing |
| 827 | * items on the hctx->dispatch list. Ignore that for now. |
| 828 | */ |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 829 | static void blk_mq_process_rq_list(struct blk_mq_hw_ctx *hctx) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 830 | { |
| 831 | struct request_queue *q = hctx->queue; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 832 | struct request *rq; |
| 833 | LIST_HEAD(rq_list); |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 834 | LIST_HEAD(driver_list); |
| 835 | struct list_head *dptr; |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 836 | int queued; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 837 | |
Bart Van Assche | 5d1b25c | 2016-10-28 17:19:15 -0700 | [diff] [blame] | 838 | if (unlikely(blk_mq_hctx_stopped(hctx))) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 839 | return; |
| 840 | |
| 841 | hctx->run++; |
| 842 | |
| 843 | /* |
| 844 | * Touch any software queue that has pending entries. |
| 845 | */ |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 846 | flush_busy_ctxs(hctx, &rq_list); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 847 | |
| 848 | /* |
| 849 | * If we have previous entries on our dispatch list, grab them |
| 850 | * and stuff them at the front for more fair dispatch. |
| 851 | */ |
| 852 | if (!list_empty_careful(&hctx->dispatch)) { |
| 853 | spin_lock(&hctx->lock); |
| 854 | if (!list_empty(&hctx->dispatch)) |
| 855 | list_splice_init(&hctx->dispatch, &rq_list); |
| 856 | spin_unlock(&hctx->lock); |
| 857 | } |
| 858 | |
| 859 | /* |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 860 | * Start off with dptr being NULL, so we start the first request |
| 861 | * immediately, even if we have more pending. |
| 862 | */ |
| 863 | dptr = NULL; |
| 864 | |
| 865 | /* |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 866 | * Now process all the entries, sending them to the driver. |
| 867 | */ |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 868 | queued = 0; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 869 | while (!list_empty(&rq_list)) { |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 870 | struct blk_mq_queue_data bd; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 871 | int ret; |
| 872 | |
| 873 | rq = list_first_entry(&rq_list, struct request, queuelist); |
| 874 | list_del_init(&rq->queuelist); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 875 | |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 876 | bd.rq = rq; |
| 877 | bd.list = dptr; |
| 878 | bd.last = list_empty(&rq_list); |
| 879 | |
| 880 | ret = q->mq_ops->queue_rq(hctx, &bd); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 881 | switch (ret) { |
| 882 | case BLK_MQ_RQ_QUEUE_OK: |
| 883 | queued++; |
Omar Sandoval | 52b9c33 | 2016-06-08 18:22:20 -0700 | [diff] [blame] | 884 | break; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 885 | case BLK_MQ_RQ_QUEUE_BUSY: |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 886 | list_add(&rq->queuelist, &rq_list); |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 887 | __blk_mq_requeue_request(rq); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 888 | break; |
| 889 | default: |
| 890 | pr_err("blk-mq: bad return on queue: %d\n", ret); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 891 | case BLK_MQ_RQ_QUEUE_ERROR: |
Christoph Hellwig | 1e93b8c | 2014-02-11 08:27:13 -0800 | [diff] [blame] | 892 | rq->errors = -EIO; |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 893 | blk_mq_end_request(rq, rq->errors); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 894 | break; |
| 895 | } |
| 896 | |
| 897 | if (ret == BLK_MQ_RQ_QUEUE_BUSY) |
| 898 | break; |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 899 | |
| 900 | /* |
| 901 | * We've done the first request. If we have more than 1 |
| 902 | * left in the list, set dptr to defer issue. |
| 903 | */ |
| 904 | if (!dptr && rq_list.next != rq_list.prev) |
| 905 | dptr = &driver_list; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 906 | } |
| 907 | |
Jens Axboe | 703fd1c | 2016-09-16 13:59:14 -0600 | [diff] [blame] | 908 | hctx->dispatched[queued_to_index(queued)]++; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 909 | |
| 910 | /* |
| 911 | * Any items that need requeuing? Stuff them into hctx->dispatch, |
| 912 | * that is where we will continue on next queue run. |
| 913 | */ |
| 914 | if (!list_empty(&rq_list)) { |
| 915 | spin_lock(&hctx->lock); |
| 916 | list_splice(&rq_list, &hctx->dispatch); |
| 917 | spin_unlock(&hctx->lock); |
Shaohua Li | 9ba52e5 | 2015-05-04 14:32:48 -0600 | [diff] [blame] | 918 | /* |
| 919 | * the queue is expected stopped with BLK_MQ_RQ_QUEUE_BUSY, but |
| 920 | * it's possible the queue is stopped and restarted again |
| 921 | * before this. Queue restart will dispatch requests. And since |
| 922 | * requests in rq_list aren't added into hctx->dispatch yet, |
| 923 | * the requests in rq_list might get lost. |
| 924 | * |
| 925 | * blk_mq_run_hw_queue() already checks the STOPPED bit |
| 926 | **/ |
| 927 | blk_mq_run_hw_queue(hctx, true); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 928 | } |
| 929 | } |
| 930 | |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 931 | static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx) |
| 932 | { |
| 933 | int srcu_idx; |
| 934 | |
| 935 | WARN_ON(!cpumask_test_cpu(raw_smp_processor_id(), hctx->cpumask) && |
| 936 | cpu_online(hctx->next_cpu)); |
| 937 | |
| 938 | if (!(hctx->flags & BLK_MQ_F_BLOCKING)) { |
| 939 | rcu_read_lock(); |
| 940 | blk_mq_process_rq_list(hctx); |
| 941 | rcu_read_unlock(); |
| 942 | } else { |
| 943 | srcu_idx = srcu_read_lock(&hctx->queue_rq_srcu); |
| 944 | blk_mq_process_rq_list(hctx); |
| 945 | srcu_read_unlock(&hctx->queue_rq_srcu, srcu_idx); |
| 946 | } |
| 947 | } |
| 948 | |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 949 | /* |
| 950 | * It'd be great if the workqueue API had a way to pass |
| 951 | * in a mask and had some smarts for more clever placement. |
| 952 | * For now we just round-robin here, switching for every |
| 953 | * BLK_MQ_CPU_WORK_BATCH queued items. |
| 954 | */ |
| 955 | static int blk_mq_hctx_next_cpu(struct blk_mq_hw_ctx *hctx) |
| 956 | { |
Christoph Hellwig | b657d7e | 2014-11-24 09:27:23 +0100 | [diff] [blame] | 957 | if (hctx->queue->nr_hw_queues == 1) |
| 958 | return WORK_CPU_UNBOUND; |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 959 | |
| 960 | if (--hctx->next_cpu_batch <= 0) { |
Gabriel Krisman Bertazi | c02ebfd | 2016-09-28 00:24:24 -0300 | [diff] [blame] | 961 | int next_cpu; |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 962 | |
| 963 | next_cpu = cpumask_next(hctx->next_cpu, hctx->cpumask); |
| 964 | if (next_cpu >= nr_cpu_ids) |
| 965 | next_cpu = cpumask_first(hctx->cpumask); |
| 966 | |
| 967 | hctx->next_cpu = next_cpu; |
| 968 | hctx->next_cpu_batch = BLK_MQ_CPU_WORK_BATCH; |
| 969 | } |
| 970 | |
Christoph Hellwig | b657d7e | 2014-11-24 09:27:23 +0100 | [diff] [blame] | 971 | return hctx->next_cpu; |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 972 | } |
| 973 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 974 | void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) |
| 975 | { |
Bart Van Assche | 5d1b25c | 2016-10-28 17:19:15 -0700 | [diff] [blame] | 976 | if (unlikely(blk_mq_hctx_stopped(hctx) || |
| 977 | !blk_mq_hw_queue_mapped(hctx))) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 978 | return; |
| 979 | |
Jens Axboe | 1b792f2 | 2016-09-21 10:12:13 -0600 | [diff] [blame] | 980 | if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) { |
Paolo Bonzini | 2a90d4a | 2014-11-07 23:04:00 +0100 | [diff] [blame] | 981 | int cpu = get_cpu(); |
| 982 | if (cpumask_test_cpu(cpu, hctx->cpumask)) { |
Paolo Bonzini | 398205b | 2014-11-07 23:03:59 +0100 | [diff] [blame] | 983 | __blk_mq_run_hw_queue(hctx); |
Paolo Bonzini | 2a90d4a | 2014-11-07 23:04:00 +0100 | [diff] [blame] | 984 | put_cpu(); |
Paolo Bonzini | 398205b | 2014-11-07 23:03:59 +0100 | [diff] [blame] | 985 | return; |
| 986 | } |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 987 | |
Paolo Bonzini | 2a90d4a | 2014-11-07 23:04:00 +0100 | [diff] [blame] | 988 | put_cpu(); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 989 | } |
Paolo Bonzini | 398205b | 2014-11-07 23:03:59 +0100 | [diff] [blame] | 990 | |
Jens Axboe | 27489a3 | 2016-08-24 15:54:25 -0600 | [diff] [blame] | 991 | kblockd_schedule_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 992 | } |
| 993 | |
Mike Snitzer | b94ec29 | 2015-03-11 23:56:38 -0400 | [diff] [blame] | 994 | void blk_mq_run_hw_queues(struct request_queue *q, bool async) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 995 | { |
| 996 | struct blk_mq_hw_ctx *hctx; |
| 997 | int i; |
| 998 | |
| 999 | queue_for_each_hw_ctx(q, hctx, i) { |
| 1000 | if ((!blk_mq_hctx_has_pending(hctx) && |
| 1001 | list_empty_careful(&hctx->dispatch)) || |
Bart Van Assche | 5d1b25c | 2016-10-28 17:19:15 -0700 | [diff] [blame] | 1002 | blk_mq_hctx_stopped(hctx)) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1003 | continue; |
| 1004 | |
Mike Snitzer | b94ec29 | 2015-03-11 23:56:38 -0400 | [diff] [blame] | 1005 | blk_mq_run_hw_queue(hctx, async); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1006 | } |
| 1007 | } |
Mike Snitzer | b94ec29 | 2015-03-11 23:56:38 -0400 | [diff] [blame] | 1008 | EXPORT_SYMBOL(blk_mq_run_hw_queues); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1009 | |
Bart Van Assche | fd00144 | 2016-10-28 17:19:37 -0700 | [diff] [blame] | 1010 | /** |
| 1011 | * blk_mq_queue_stopped() - check whether one or more hctxs have been stopped |
| 1012 | * @q: request queue. |
| 1013 | * |
| 1014 | * The caller is responsible for serializing this function against |
| 1015 | * blk_mq_{start,stop}_hw_queue(). |
| 1016 | */ |
| 1017 | bool blk_mq_queue_stopped(struct request_queue *q) |
| 1018 | { |
| 1019 | struct blk_mq_hw_ctx *hctx; |
| 1020 | int i; |
| 1021 | |
| 1022 | queue_for_each_hw_ctx(q, hctx, i) |
| 1023 | if (blk_mq_hctx_stopped(hctx)) |
| 1024 | return true; |
| 1025 | |
| 1026 | return false; |
| 1027 | } |
| 1028 | EXPORT_SYMBOL(blk_mq_queue_stopped); |
| 1029 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1030 | void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx) |
| 1031 | { |
Jens Axboe | 27489a3 | 2016-08-24 15:54:25 -0600 | [diff] [blame] | 1032 | cancel_work(&hctx->run_work); |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 1033 | cancel_delayed_work(&hctx->delay_work); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1034 | set_bit(BLK_MQ_S_STOPPED, &hctx->state); |
| 1035 | } |
| 1036 | EXPORT_SYMBOL(blk_mq_stop_hw_queue); |
| 1037 | |
Christoph Hellwig | 280d45f | 2013-10-25 14:45:58 +0100 | [diff] [blame] | 1038 | void blk_mq_stop_hw_queues(struct request_queue *q) |
| 1039 | { |
| 1040 | struct blk_mq_hw_ctx *hctx; |
| 1041 | int i; |
| 1042 | |
| 1043 | queue_for_each_hw_ctx(q, hctx, i) |
| 1044 | blk_mq_stop_hw_queue(hctx); |
| 1045 | } |
| 1046 | EXPORT_SYMBOL(blk_mq_stop_hw_queues); |
| 1047 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1048 | void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx) |
| 1049 | { |
| 1050 | clear_bit(BLK_MQ_S_STOPPED, &hctx->state); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1051 | |
Jens Axboe | 0ffbce8 | 2014-06-25 08:22:34 -0600 | [diff] [blame] | 1052 | blk_mq_run_hw_queue(hctx, false); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1053 | } |
| 1054 | EXPORT_SYMBOL(blk_mq_start_hw_queue); |
| 1055 | |
Christoph Hellwig | 2f26855 | 2014-04-16 09:44:56 +0200 | [diff] [blame] | 1056 | void blk_mq_start_hw_queues(struct request_queue *q) |
| 1057 | { |
| 1058 | struct blk_mq_hw_ctx *hctx; |
| 1059 | int i; |
| 1060 | |
| 1061 | queue_for_each_hw_ctx(q, hctx, i) |
| 1062 | blk_mq_start_hw_queue(hctx); |
| 1063 | } |
| 1064 | EXPORT_SYMBOL(blk_mq_start_hw_queues); |
| 1065 | |
Christoph Hellwig | 1b4a325 | 2014-04-16 09:44:54 +0200 | [diff] [blame] | 1066 | void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1067 | { |
| 1068 | struct blk_mq_hw_ctx *hctx; |
| 1069 | int i; |
| 1070 | |
| 1071 | queue_for_each_hw_ctx(q, hctx, i) { |
Bart Van Assche | 5d1b25c | 2016-10-28 17:19:15 -0700 | [diff] [blame] | 1072 | if (!blk_mq_hctx_stopped(hctx)) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1073 | continue; |
| 1074 | |
| 1075 | clear_bit(BLK_MQ_S_STOPPED, &hctx->state); |
Christoph Hellwig | 1b4a325 | 2014-04-16 09:44:54 +0200 | [diff] [blame] | 1076 | blk_mq_run_hw_queue(hctx, async); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1077 | } |
| 1078 | } |
| 1079 | EXPORT_SYMBOL(blk_mq_start_stopped_hw_queues); |
| 1080 | |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 1081 | static void blk_mq_run_work_fn(struct work_struct *work) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1082 | { |
| 1083 | struct blk_mq_hw_ctx *hctx; |
| 1084 | |
Jens Axboe | 27489a3 | 2016-08-24 15:54:25 -0600 | [diff] [blame] | 1085 | hctx = container_of(work, struct blk_mq_hw_ctx, run_work); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1086 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1087 | __blk_mq_run_hw_queue(hctx); |
| 1088 | } |
| 1089 | |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 1090 | static void blk_mq_delay_work_fn(struct work_struct *work) |
| 1091 | { |
| 1092 | struct blk_mq_hw_ctx *hctx; |
| 1093 | |
| 1094 | hctx = container_of(work, struct blk_mq_hw_ctx, delay_work.work); |
| 1095 | |
| 1096 | if (test_and_clear_bit(BLK_MQ_S_STOPPED, &hctx->state)) |
| 1097 | __blk_mq_run_hw_queue(hctx); |
| 1098 | } |
| 1099 | |
| 1100 | void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs) |
| 1101 | { |
Ming Lei | 19c66e5 | 2014-12-03 19:38:04 +0800 | [diff] [blame] | 1102 | if (unlikely(!blk_mq_hw_queue_mapped(hctx))) |
| 1103 | return; |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 1104 | |
Christoph Hellwig | b657d7e | 2014-11-24 09:27:23 +0100 | [diff] [blame] | 1105 | kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx), |
| 1106 | &hctx->delay_work, msecs_to_jiffies(msecs)); |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 1107 | } |
| 1108 | EXPORT_SYMBOL(blk_mq_delay_queue); |
| 1109 | |
Ming Lei | cfd0c55 | 2015-10-20 23:13:57 +0800 | [diff] [blame] | 1110 | static inline void __blk_mq_insert_req_list(struct blk_mq_hw_ctx *hctx, |
Ming Lei | cfd0c55 | 2015-10-20 23:13:57 +0800 | [diff] [blame] | 1111 | struct request *rq, |
| 1112 | bool at_head) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1113 | { |
Jens Axboe | e57690f | 2016-08-24 15:34:35 -0600 | [diff] [blame] | 1114 | struct blk_mq_ctx *ctx = rq->mq_ctx; |
| 1115 | |
Jens Axboe | 01b983c | 2013-11-19 18:59:10 -0700 | [diff] [blame] | 1116 | trace_block_rq_insert(hctx->queue, rq); |
| 1117 | |
Christoph Hellwig | 72a0a36 | 2014-02-07 10:22:36 -0800 | [diff] [blame] | 1118 | if (at_head) |
| 1119 | list_add(&rq->queuelist, &ctx->rq_list); |
| 1120 | else |
| 1121 | list_add_tail(&rq->queuelist, &ctx->rq_list); |
Ming Lei | cfd0c55 | 2015-10-20 23:13:57 +0800 | [diff] [blame] | 1122 | } |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 1123 | |
Ming Lei | cfd0c55 | 2015-10-20 23:13:57 +0800 | [diff] [blame] | 1124 | static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, |
| 1125 | struct request *rq, bool at_head) |
| 1126 | { |
| 1127 | struct blk_mq_ctx *ctx = rq->mq_ctx; |
| 1128 | |
Jens Axboe | e57690f | 2016-08-24 15:34:35 -0600 | [diff] [blame] | 1129 | __blk_mq_insert_req_list(hctx, rq, at_head); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1130 | blk_mq_hctx_mark_pending(hctx, ctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1131 | } |
| 1132 | |
Christoph Hellwig | eeabc85 | 2014-03-21 08:57:37 -0600 | [diff] [blame] | 1133 | void blk_mq_insert_request(struct request *rq, bool at_head, bool run_queue, |
Jens Axboe | e57690f | 2016-08-24 15:34:35 -0600 | [diff] [blame] | 1134 | bool async) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1135 | { |
Jens Axboe | e57690f | 2016-08-24 15:34:35 -0600 | [diff] [blame] | 1136 | struct blk_mq_ctx *ctx = rq->mq_ctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1137 | struct request_queue *q = rq->q; |
Christoph Hellwig | 7d7e0f9 | 2016-09-14 16:18:54 +0200 | [diff] [blame] | 1138 | struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1139 | |
Christoph Hellwig | a57a178 | 2014-09-16 14:44:07 -0700 | [diff] [blame] | 1140 | spin_lock(&ctx->lock); |
| 1141 | __blk_mq_insert_request(hctx, rq, at_head); |
| 1142 | spin_unlock(&ctx->lock); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1143 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1144 | if (run_queue) |
| 1145 | blk_mq_run_hw_queue(hctx, async); |
| 1146 | } |
| 1147 | |
| 1148 | static void blk_mq_insert_requests(struct request_queue *q, |
| 1149 | struct blk_mq_ctx *ctx, |
| 1150 | struct list_head *list, |
| 1151 | int depth, |
| 1152 | bool from_schedule) |
| 1153 | |
| 1154 | { |
Christoph Hellwig | 7d7e0f9 | 2016-09-14 16:18:54 +0200 | [diff] [blame] | 1155 | struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1156 | |
| 1157 | trace_block_unplug(q, depth, !from_schedule); |
| 1158 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1159 | /* |
| 1160 | * preemption doesn't flush plug list, so it's possible ctx->cpu is |
| 1161 | * offline now |
| 1162 | */ |
| 1163 | spin_lock(&ctx->lock); |
| 1164 | while (!list_empty(list)) { |
| 1165 | struct request *rq; |
| 1166 | |
| 1167 | rq = list_first_entry(list, struct request, queuelist); |
Jens Axboe | e57690f | 2016-08-24 15:34:35 -0600 | [diff] [blame] | 1168 | BUG_ON(rq->mq_ctx != ctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1169 | list_del_init(&rq->queuelist); |
Jens Axboe | e57690f | 2016-08-24 15:34:35 -0600 | [diff] [blame] | 1170 | __blk_mq_insert_req_list(hctx, rq, false); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1171 | } |
Ming Lei | cfd0c55 | 2015-10-20 23:13:57 +0800 | [diff] [blame] | 1172 | blk_mq_hctx_mark_pending(hctx, ctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1173 | spin_unlock(&ctx->lock); |
| 1174 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1175 | blk_mq_run_hw_queue(hctx, from_schedule); |
| 1176 | } |
| 1177 | |
| 1178 | static int plug_ctx_cmp(void *priv, struct list_head *a, struct list_head *b) |
| 1179 | { |
| 1180 | struct request *rqa = container_of(a, struct request, queuelist); |
| 1181 | struct request *rqb = container_of(b, struct request, queuelist); |
| 1182 | |
| 1183 | return !(rqa->mq_ctx < rqb->mq_ctx || |
| 1184 | (rqa->mq_ctx == rqb->mq_ctx && |
| 1185 | blk_rq_pos(rqa) < blk_rq_pos(rqb))); |
| 1186 | } |
| 1187 | |
| 1188 | void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule) |
| 1189 | { |
| 1190 | struct blk_mq_ctx *this_ctx; |
| 1191 | struct request_queue *this_q; |
| 1192 | struct request *rq; |
| 1193 | LIST_HEAD(list); |
| 1194 | LIST_HEAD(ctx_list); |
| 1195 | unsigned int depth; |
| 1196 | |
| 1197 | list_splice_init(&plug->mq_list, &list); |
| 1198 | |
| 1199 | list_sort(NULL, &list, plug_ctx_cmp); |
| 1200 | |
| 1201 | this_q = NULL; |
| 1202 | this_ctx = NULL; |
| 1203 | depth = 0; |
| 1204 | |
| 1205 | while (!list_empty(&list)) { |
| 1206 | rq = list_entry_rq(list.next); |
| 1207 | list_del_init(&rq->queuelist); |
| 1208 | BUG_ON(!rq->q); |
| 1209 | if (rq->mq_ctx != this_ctx) { |
| 1210 | if (this_ctx) { |
| 1211 | blk_mq_insert_requests(this_q, this_ctx, |
| 1212 | &ctx_list, depth, |
| 1213 | from_schedule); |
| 1214 | } |
| 1215 | |
| 1216 | this_ctx = rq->mq_ctx; |
| 1217 | this_q = rq->q; |
| 1218 | depth = 0; |
| 1219 | } |
| 1220 | |
| 1221 | depth++; |
| 1222 | list_add_tail(&rq->queuelist, &ctx_list); |
| 1223 | } |
| 1224 | |
| 1225 | /* |
| 1226 | * If 'this_ctx' is set, we know we have entries to complete |
| 1227 | * on 'ctx_list'. Do those. |
| 1228 | */ |
| 1229 | if (this_ctx) { |
| 1230 | blk_mq_insert_requests(this_q, this_ctx, &ctx_list, depth, |
| 1231 | from_schedule); |
| 1232 | } |
| 1233 | } |
| 1234 | |
| 1235 | static void blk_mq_bio_to_request(struct request *rq, struct bio *bio) |
| 1236 | { |
| 1237 | init_request_from_bio(rq, bio); |
Jens Axboe | 4b57052 | 2014-05-29 11:00:11 -0600 | [diff] [blame] | 1238 | |
Michael Callahan | a21f2a3 | 2016-05-03 11:12:49 -0400 | [diff] [blame] | 1239 | blk_account_io_start(rq, 1); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1240 | } |
| 1241 | |
Jens Axboe | 274a584 | 2014-08-15 12:44:08 -0600 | [diff] [blame] | 1242 | static inline bool hctx_allow_merges(struct blk_mq_hw_ctx *hctx) |
| 1243 | { |
| 1244 | return (hctx->flags & BLK_MQ_F_SHOULD_MERGE) && |
| 1245 | !blk_queue_nomerges(hctx->queue); |
| 1246 | } |
| 1247 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1248 | static inline bool blk_mq_merge_queue_io(struct blk_mq_hw_ctx *hctx, |
| 1249 | struct blk_mq_ctx *ctx, |
| 1250 | struct request *rq, struct bio *bio) |
| 1251 | { |
Ming Lei | e18378a | 2015-10-20 23:13:54 +0800 | [diff] [blame] | 1252 | if (!hctx_allow_merges(hctx) || !bio_mergeable(bio)) { |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1253 | blk_mq_bio_to_request(rq, bio); |
| 1254 | spin_lock(&ctx->lock); |
| 1255 | insert_rq: |
| 1256 | __blk_mq_insert_request(hctx, rq, false); |
| 1257 | spin_unlock(&ctx->lock); |
| 1258 | return false; |
| 1259 | } else { |
Jens Axboe | 274a584 | 2014-08-15 12:44:08 -0600 | [diff] [blame] | 1260 | struct request_queue *q = hctx->queue; |
| 1261 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1262 | spin_lock(&ctx->lock); |
| 1263 | if (!blk_mq_attempt_merge(q, ctx, bio)) { |
| 1264 | blk_mq_bio_to_request(rq, bio); |
| 1265 | goto insert_rq; |
| 1266 | } |
| 1267 | |
| 1268 | spin_unlock(&ctx->lock); |
| 1269 | __blk_mq_free_request(hctx, ctx, rq); |
| 1270 | return true; |
| 1271 | } |
| 1272 | } |
| 1273 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1274 | static struct request *blk_mq_map_request(struct request_queue *q, |
| 1275 | struct bio *bio, |
Jens Axboe | 2552e3f | 2016-10-27 19:03:55 -0600 | [diff] [blame] | 1276 | struct blk_mq_alloc_data *data) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1277 | { |
| 1278 | struct blk_mq_hw_ctx *hctx; |
| 1279 | struct blk_mq_ctx *ctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1280 | struct request *rq; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1281 | |
Dan Williams | 3ef28e8 | 2015-10-21 13:20:12 -0400 | [diff] [blame] | 1282 | blk_queue_enter_live(q); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1283 | ctx = blk_mq_get_ctx(q); |
Christoph Hellwig | 7d7e0f9 | 2016-09-14 16:18:54 +0200 | [diff] [blame] | 1284 | hctx = blk_mq_map_queue(q, ctx->cpu); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1285 | |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 1286 | trace_block_getrq(q, bio, bio->bi_opf); |
Jens Axboe | 2552e3f | 2016-10-27 19:03:55 -0600 | [diff] [blame] | 1287 | blk_mq_set_alloc_data(data, q, 0, ctx, hctx); |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 1288 | rq = __blk_mq_alloc_request(data, bio->bi_opf); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1289 | |
Jens Axboe | 7dd2fb6 | 2016-10-27 09:49:19 -0600 | [diff] [blame] | 1290 | data->hctx->queued++; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1291 | return rq; |
| 1292 | } |
| 1293 | |
Jens Axboe | 066a4a7 | 2016-11-11 12:24:46 -0700 | [diff] [blame] | 1294 | static void blk_mq_try_issue_directly(struct request *rq, blk_qc_t *cookie) |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1295 | { |
| 1296 | int ret; |
| 1297 | struct request_queue *q = rq->q; |
Jens Axboe | 066a4a7 | 2016-11-11 12:24:46 -0700 | [diff] [blame] | 1298 | struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, rq->mq_ctx->cpu); |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1299 | struct blk_mq_queue_data bd = { |
| 1300 | .rq = rq, |
| 1301 | .list = NULL, |
| 1302 | .last = 1 |
| 1303 | }; |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1304 | blk_qc_t new_cookie = blk_tag_to_qc_t(rq->tag, hctx->queue_num); |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1305 | |
Bart Van Assche | 2253efc | 2016-10-28 17:20:02 -0700 | [diff] [blame] | 1306 | if (blk_mq_hctx_stopped(hctx)) |
| 1307 | goto insert; |
| 1308 | |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1309 | /* |
| 1310 | * For OK queue, we are done. For error, kill it. Any other |
| 1311 | * error (busy), just add it to our list as we previously |
| 1312 | * would have done |
| 1313 | */ |
| 1314 | ret = q->mq_ops->queue_rq(hctx, &bd); |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1315 | if (ret == BLK_MQ_RQ_QUEUE_OK) { |
| 1316 | *cookie = new_cookie; |
Bart Van Assche | 2253efc | 2016-10-28 17:20:02 -0700 | [diff] [blame] | 1317 | return; |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1318 | } |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1319 | |
| 1320 | __blk_mq_requeue_request(rq); |
| 1321 | |
| 1322 | if (ret == BLK_MQ_RQ_QUEUE_ERROR) { |
| 1323 | *cookie = BLK_QC_T_NONE; |
| 1324 | rq->errors = -EIO; |
| 1325 | blk_mq_end_request(rq, rq->errors); |
Bart Van Assche | 2253efc | 2016-10-28 17:20:02 -0700 | [diff] [blame] | 1326 | return; |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1327 | } |
| 1328 | |
Bart Van Assche | 2253efc | 2016-10-28 17:20:02 -0700 | [diff] [blame] | 1329 | insert: |
| 1330 | blk_mq_insert_request(rq, false, true, true); |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1331 | } |
| 1332 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1333 | /* |
| 1334 | * Multiple hardware queue variant. This will not use per-process plugs, |
| 1335 | * but will attempt to bypass the hctx queueing if we can go straight to |
| 1336 | * hardware for SYNC IO. |
| 1337 | */ |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1338 | static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio) |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1339 | { |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 1340 | const int is_sync = op_is_sync(bio->bi_opf); |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 1341 | const int is_flush_fua = bio->bi_opf & (REQ_PREFLUSH | REQ_FUA); |
Jens Axboe | 2552e3f | 2016-10-27 19:03:55 -0600 | [diff] [blame] | 1342 | struct blk_mq_alloc_data data; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1343 | struct request *rq; |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 1344 | unsigned int request_count = 0, srcu_idx; |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1345 | struct blk_plug *plug; |
Shaohua Li | 5b3f341 | 2015-05-08 10:51:33 -0700 | [diff] [blame] | 1346 | struct request *same_queue_rq = NULL; |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1347 | blk_qc_t cookie; |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 1348 | unsigned int wb_acct; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1349 | |
| 1350 | blk_queue_bounce(q, &bio); |
| 1351 | |
| 1352 | if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) { |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1353 | bio_io_error(bio); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1354 | return BLK_QC_T_NONE; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1355 | } |
| 1356 | |
Kent Overstreet | 54efd50 | 2015-04-23 22:37:18 -0700 | [diff] [blame] | 1357 | blk_queue_split(q, &bio, q->bio_split); |
| 1358 | |
Omar Sandoval | 87c279e | 2016-06-01 22:18:48 -0700 | [diff] [blame] | 1359 | if (!is_flush_fua && !blk_queue_nomerges(q) && |
| 1360 | blk_attempt_plug_merge(q, bio, &request_count, &same_queue_rq)) |
| 1361 | return BLK_QC_T_NONE; |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1362 | |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 1363 | wb_acct = wbt_wait(q->rq_wb, bio, NULL); |
| 1364 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1365 | rq = blk_mq_map_request(q, bio, &data); |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 1366 | if (unlikely(!rq)) { |
| 1367 | __wbt_done(q->rq_wb, wb_acct); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1368 | return BLK_QC_T_NONE; |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 1369 | } |
| 1370 | |
| 1371 | wbt_track(&rq->issue_stat, wb_acct); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1372 | |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1373 | cookie = blk_tag_to_qc_t(rq->tag, data.hctx->queue_num); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1374 | |
| 1375 | if (unlikely(is_flush_fua)) { |
| 1376 | blk_mq_bio_to_request(rq, bio); |
| 1377 | blk_insert_flush(rq); |
| 1378 | goto run_queue; |
| 1379 | } |
| 1380 | |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1381 | plug = current->plug; |
Jens Axboe | e167dfb | 2014-10-29 11:18:26 -0600 | [diff] [blame] | 1382 | /* |
| 1383 | * If the driver supports defer issued based on 'last', then |
| 1384 | * queue it up like normal since we can potentially save some |
| 1385 | * CPU this way. |
| 1386 | */ |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1387 | if (((plug && !blk_queue_nomerges(q)) || is_sync) && |
| 1388 | !(data.hctx->flags & BLK_MQ_F_DEFER_ISSUE)) { |
| 1389 | struct request *old_rq = NULL; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1390 | |
| 1391 | blk_mq_bio_to_request(rq, bio); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1392 | |
| 1393 | /* |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 1394 | * We do limited plugging. If the bio can be merged, do that. |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1395 | * Otherwise the existing request in the plug list will be |
| 1396 | * issued. So the plug list will have one request at most |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1397 | */ |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1398 | if (plug) { |
Shaohua Li | 5b3f341 | 2015-05-08 10:51:33 -0700 | [diff] [blame] | 1399 | /* |
| 1400 | * The plug list might get flushed before this. If that |
Jens Axboe | b094f89 | 2015-11-20 20:29:45 -0700 | [diff] [blame] | 1401 | * happens, same_queue_rq is invalid and plug list is |
| 1402 | * empty |
| 1403 | */ |
Shaohua Li | 5b3f341 | 2015-05-08 10:51:33 -0700 | [diff] [blame] | 1404 | if (same_queue_rq && !list_empty(&plug->mq_list)) { |
| 1405 | old_rq = same_queue_rq; |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1406 | list_del_init(&old_rq->queuelist); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1407 | } |
Shaohua Li | f984df1 | 2015-05-08 10:51:32 -0700 | [diff] [blame] | 1408 | list_add_tail(&rq->queuelist, &plug->mq_list); |
| 1409 | } else /* is_sync */ |
| 1410 | old_rq = rq; |
| 1411 | blk_mq_put_ctx(data.ctx); |
| 1412 | if (!old_rq) |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1413 | goto done; |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 1414 | |
| 1415 | if (!(data.hctx->flags & BLK_MQ_F_BLOCKING)) { |
| 1416 | rcu_read_lock(); |
Jens Axboe | 066a4a7 | 2016-11-11 12:24:46 -0700 | [diff] [blame] | 1417 | blk_mq_try_issue_directly(old_rq, &cookie); |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 1418 | rcu_read_unlock(); |
| 1419 | } else { |
| 1420 | srcu_idx = srcu_read_lock(&data.hctx->queue_rq_srcu); |
Jens Axboe | 066a4a7 | 2016-11-11 12:24:46 -0700 | [diff] [blame] | 1421 | blk_mq_try_issue_directly(old_rq, &cookie); |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 1422 | srcu_read_unlock(&data.hctx->queue_rq_srcu, srcu_idx); |
| 1423 | } |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1424 | goto done; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1425 | } |
| 1426 | |
| 1427 | if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) { |
| 1428 | /* |
| 1429 | * For a SYNC request, send it to the hardware immediately. For |
| 1430 | * an ASYNC request, just ensure that we run it later on. The |
| 1431 | * latter allows for merging opportunities and more efficient |
| 1432 | * dispatching. |
| 1433 | */ |
| 1434 | run_queue: |
| 1435 | blk_mq_run_hw_queue(data.hctx, !is_sync || is_flush_fua); |
| 1436 | } |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1437 | blk_mq_put_ctx(data.ctx); |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1438 | done: |
| 1439 | return cookie; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1440 | } |
| 1441 | |
| 1442 | /* |
| 1443 | * Single hardware queue variant. This will attempt to use any per-process |
| 1444 | * plug for merging and IO deferral. |
| 1445 | */ |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1446 | static blk_qc_t blk_sq_make_request(struct request_queue *q, struct bio *bio) |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1447 | { |
Christoph Hellwig | ef295ec | 2016-10-28 08:48:16 -0600 | [diff] [blame] | 1448 | const int is_sync = op_is_sync(bio->bi_opf); |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 1449 | const int is_flush_fua = bio->bi_opf & (REQ_PREFLUSH | REQ_FUA); |
Jeff Moyer | e6c4438 | 2015-05-08 10:51:30 -0700 | [diff] [blame] | 1450 | struct blk_plug *plug; |
| 1451 | unsigned int request_count = 0; |
Jens Axboe | 2552e3f | 2016-10-27 19:03:55 -0600 | [diff] [blame] | 1452 | struct blk_mq_alloc_data data; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1453 | struct request *rq; |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1454 | blk_qc_t cookie; |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 1455 | unsigned int wb_acct; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1456 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1457 | blk_queue_bounce(q, &bio); |
| 1458 | |
| 1459 | if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) { |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 1460 | bio_io_error(bio); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1461 | return BLK_QC_T_NONE; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1462 | } |
| 1463 | |
Kent Overstreet | 54efd50 | 2015-04-23 22:37:18 -0700 | [diff] [blame] | 1464 | blk_queue_split(q, &bio, q->bio_split); |
| 1465 | |
Omar Sandoval | 87c279e | 2016-06-01 22:18:48 -0700 | [diff] [blame] | 1466 | if (!is_flush_fua && !blk_queue_nomerges(q)) { |
| 1467 | if (blk_attempt_plug_merge(q, bio, &request_count, NULL)) |
| 1468 | return BLK_QC_T_NONE; |
| 1469 | } else |
| 1470 | request_count = blk_plug_queued_count(q); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1471 | |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 1472 | wb_acct = wbt_wait(q->rq_wb, bio, NULL); |
| 1473 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1474 | rq = blk_mq_map_request(q, bio, &data); |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 1475 | if (unlikely(!rq)) { |
| 1476 | __wbt_done(q->rq_wb, wb_acct); |
Jens Axboe | dece163 | 2015-11-05 10:41:16 -0700 | [diff] [blame] | 1477 | return BLK_QC_T_NONE; |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 1478 | } |
| 1479 | |
| 1480 | wbt_track(&rq->issue_stat, wb_acct); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1481 | |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1482 | cookie = blk_tag_to_qc_t(rq->tag, data.hctx->queue_num); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1483 | |
| 1484 | if (unlikely(is_flush_fua)) { |
| 1485 | blk_mq_bio_to_request(rq, bio); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1486 | blk_insert_flush(rq); |
| 1487 | goto run_queue; |
| 1488 | } |
| 1489 | |
| 1490 | /* |
| 1491 | * A task plug currently exists. Since this is completely lockless, |
| 1492 | * utilize that to temporarily store requests until the task is |
| 1493 | * either done or scheduled away. |
| 1494 | */ |
Jeff Moyer | e6c4438 | 2015-05-08 10:51:30 -0700 | [diff] [blame] | 1495 | plug = current->plug; |
| 1496 | if (plug) { |
Shaohua Li | 600271d | 2016-11-03 17:03:54 -0700 | [diff] [blame] | 1497 | struct request *last = NULL; |
| 1498 | |
Jeff Moyer | e6c4438 | 2015-05-08 10:51:30 -0700 | [diff] [blame] | 1499 | blk_mq_bio_to_request(rq, bio); |
Ming Lei | 676d060 | 2015-10-20 23:13:56 +0800 | [diff] [blame] | 1500 | if (!request_count) |
Jeff Moyer | e6c4438 | 2015-05-08 10:51:30 -0700 | [diff] [blame] | 1501 | trace_block_plug(q); |
Shaohua Li | 600271d | 2016-11-03 17:03:54 -0700 | [diff] [blame] | 1502 | else |
| 1503 | last = list_entry_rq(plug->mq_list.prev); |
Jens Axboe | b094f89 | 2015-11-20 20:29:45 -0700 | [diff] [blame] | 1504 | |
| 1505 | blk_mq_put_ctx(data.ctx); |
| 1506 | |
Shaohua Li | 600271d | 2016-11-03 17:03:54 -0700 | [diff] [blame] | 1507 | if (request_count >= BLK_MAX_REQUEST_COUNT || (last && |
| 1508 | blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE)) { |
Jeff Moyer | e6c4438 | 2015-05-08 10:51:30 -0700 | [diff] [blame] | 1509 | blk_flush_plug_list(plug, false); |
| 1510 | trace_block_plug(q); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1511 | } |
Jens Axboe | b094f89 | 2015-11-20 20:29:45 -0700 | [diff] [blame] | 1512 | |
Jeff Moyer | e6c4438 | 2015-05-08 10:51:30 -0700 | [diff] [blame] | 1513 | list_add_tail(&rq->queuelist, &plug->mq_list); |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1514 | return cookie; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1515 | } |
| 1516 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1517 | if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) { |
| 1518 | /* |
| 1519 | * For a SYNC request, send it to the hardware immediately. For |
| 1520 | * an ASYNC request, just ensure that we run it later on. The |
| 1521 | * latter allows for merging opportunities and more efficient |
| 1522 | * dispatching. |
| 1523 | */ |
| 1524 | run_queue: |
| 1525 | blk_mq_run_hw_queue(data.hctx, !is_sync || is_flush_fua); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1526 | } |
| 1527 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1528 | blk_mq_put_ctx(data.ctx); |
Jens Axboe | 7b37163 | 2015-11-05 10:41:40 -0700 | [diff] [blame] | 1529 | return cookie; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1530 | } |
| 1531 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1532 | static void blk_mq_free_rq_map(struct blk_mq_tag_set *set, |
| 1533 | struct blk_mq_tags *tags, unsigned int hctx_idx) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1534 | { |
| 1535 | struct page *page; |
| 1536 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1537 | if (tags->rqs && set->ops->exit_request) { |
Christoph Hellwig | e9b267d | 2014-04-15 13:59:10 -0600 | [diff] [blame] | 1538 | int i; |
| 1539 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1540 | for (i = 0; i < tags->nr_tags; i++) { |
| 1541 | if (!tags->rqs[i]) |
Christoph Hellwig | e9b267d | 2014-04-15 13:59:10 -0600 | [diff] [blame] | 1542 | continue; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1543 | set->ops->exit_request(set->driver_data, tags->rqs[i], |
| 1544 | hctx_idx, i); |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1545 | tags->rqs[i] = NULL; |
Christoph Hellwig | e9b267d | 2014-04-15 13:59:10 -0600 | [diff] [blame] | 1546 | } |
| 1547 | } |
| 1548 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1549 | while (!list_empty(&tags->page_list)) { |
| 1550 | page = list_first_entry(&tags->page_list, struct page, lru); |
Dave Hansen | 6753471 | 2014-01-08 20:17:46 -0700 | [diff] [blame] | 1551 | list_del_init(&page->lru); |
Catalin Marinas | f75782e | 2015-09-14 18:16:02 +0100 | [diff] [blame] | 1552 | /* |
| 1553 | * Remove kmemleak object previously allocated in |
| 1554 | * blk_mq_init_rq_map(). |
| 1555 | */ |
| 1556 | kmemleak_free(page_address(page)); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1557 | __free_pages(page, page->private); |
| 1558 | } |
| 1559 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1560 | kfree(tags->rqs); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1561 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1562 | blk_mq_free_tags(tags); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1563 | } |
| 1564 | |
| 1565 | static size_t order_to_size(unsigned int order) |
| 1566 | { |
Ming Lei | 4ca0850 | 2014-04-19 18:00:18 +0800 | [diff] [blame] | 1567 | return (size_t)PAGE_SIZE << order; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1568 | } |
| 1569 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1570 | static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set, |
| 1571 | unsigned int hctx_idx) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1572 | { |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1573 | struct blk_mq_tags *tags; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1574 | unsigned int i, j, entries_per_page, max_order = 4; |
| 1575 | size_t rq_size, left; |
| 1576 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1577 | tags = blk_mq_init_tags(set->queue_depth, set->reserved_tags, |
Shaohua Li | 24391c0 | 2015-01-23 14:18:00 -0700 | [diff] [blame] | 1578 | set->numa_node, |
| 1579 | BLK_MQ_FLAG_TO_ALLOC_POLICY(set->flags)); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1580 | if (!tags) |
| 1581 | return NULL; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1582 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1583 | INIT_LIST_HEAD(&tags->page_list); |
| 1584 | |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1585 | tags->rqs = kzalloc_node(set->queue_depth * sizeof(struct request *), |
| 1586 | GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY, |
| 1587 | set->numa_node); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1588 | if (!tags->rqs) { |
| 1589 | blk_mq_free_tags(tags); |
| 1590 | return NULL; |
| 1591 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1592 | |
| 1593 | /* |
| 1594 | * rq_size is the size of the request plus driver payload, rounded |
| 1595 | * to the cacheline size |
| 1596 | */ |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1597 | rq_size = round_up(sizeof(struct request) + set->cmd_size, |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1598 | cache_line_size()); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1599 | left = rq_size * set->queue_depth; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1600 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1601 | for (i = 0; i < set->queue_depth; ) { |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1602 | int this_order = max_order; |
| 1603 | struct page *page; |
| 1604 | int to_do; |
| 1605 | void *p; |
| 1606 | |
Bartlomiej Zolnierkiewicz | b3a834b | 2016-05-16 09:54:47 -0600 | [diff] [blame] | 1607 | while (this_order && left < order_to_size(this_order - 1)) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1608 | this_order--; |
| 1609 | |
| 1610 | do { |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1611 | page = alloc_pages_node(set->numa_node, |
Linus Torvalds | ac21117 | 2015-04-09 14:12:22 -0700 | [diff] [blame] | 1612 | GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO, |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1613 | this_order); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1614 | if (page) |
| 1615 | break; |
| 1616 | if (!this_order--) |
| 1617 | break; |
| 1618 | if (order_to_size(this_order) < rq_size) |
| 1619 | break; |
| 1620 | } while (1); |
| 1621 | |
| 1622 | if (!page) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1623 | goto fail; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1624 | |
| 1625 | page->private = this_order; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1626 | list_add_tail(&page->lru, &tags->page_list); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1627 | |
| 1628 | p = page_address(page); |
Catalin Marinas | f75782e | 2015-09-14 18:16:02 +0100 | [diff] [blame] | 1629 | /* |
| 1630 | * Allow kmemleak to scan these pages as they contain pointers |
| 1631 | * to additional allocations like via ops->init_request(). |
| 1632 | */ |
| 1633 | kmemleak_alloc(p, order_to_size(this_order), 1, GFP_KERNEL); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1634 | entries_per_page = order_to_size(this_order) / rq_size; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1635 | to_do = min(entries_per_page, set->queue_depth - i); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1636 | left -= to_do * rq_size; |
| 1637 | for (j = 0; j < to_do; j++) { |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1638 | tags->rqs[i] = p; |
| 1639 | if (set->ops->init_request) { |
| 1640 | if (set->ops->init_request(set->driver_data, |
| 1641 | tags->rqs[i], hctx_idx, i, |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1642 | set->numa_node)) { |
| 1643 | tags->rqs[i] = NULL; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1644 | goto fail; |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1645 | } |
Christoph Hellwig | e9b267d | 2014-04-15 13:59:10 -0600 | [diff] [blame] | 1646 | } |
| 1647 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1648 | p += rq_size; |
| 1649 | i++; |
| 1650 | } |
| 1651 | } |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1652 | return tags; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1653 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1654 | fail: |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1655 | blk_mq_free_rq_map(set, tags, hctx_idx); |
| 1656 | return NULL; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1657 | } |
| 1658 | |
Jens Axboe | e57690f | 2016-08-24 15:34:35 -0600 | [diff] [blame] | 1659 | /* |
| 1660 | * 'cpu' is going away. splice any existing rq_list entries from this |
| 1661 | * software queue to the hw queue dispatch list, and ensure that it |
| 1662 | * gets run. |
| 1663 | */ |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1664 | static int blk_mq_hctx_notify_dead(unsigned int cpu, struct hlist_node *node) |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1665 | { |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1666 | struct blk_mq_hw_ctx *hctx; |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1667 | struct blk_mq_ctx *ctx; |
| 1668 | LIST_HEAD(tmp); |
| 1669 | |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1670 | hctx = hlist_entry_safe(node, struct blk_mq_hw_ctx, cpuhp_dead); |
Jens Axboe | e57690f | 2016-08-24 15:34:35 -0600 | [diff] [blame] | 1671 | ctx = __blk_mq_get_ctx(hctx->queue, cpu); |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1672 | |
| 1673 | spin_lock(&ctx->lock); |
| 1674 | if (!list_empty(&ctx->rq_list)) { |
| 1675 | list_splice_init(&ctx->rq_list, &tmp); |
| 1676 | blk_mq_hctx_clear_pending(hctx, ctx); |
| 1677 | } |
| 1678 | spin_unlock(&ctx->lock); |
| 1679 | |
| 1680 | if (list_empty(&tmp)) |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1681 | return 0; |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1682 | |
Jens Axboe | e57690f | 2016-08-24 15:34:35 -0600 | [diff] [blame] | 1683 | spin_lock(&hctx->lock); |
| 1684 | list_splice_tail_init(&tmp, &hctx->dispatch); |
| 1685 | spin_unlock(&hctx->lock); |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1686 | |
| 1687 | blk_mq_run_hw_queue(hctx, true); |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1688 | return 0; |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1689 | } |
| 1690 | |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1691 | static void blk_mq_remove_cpuhp(struct blk_mq_hw_ctx *hctx) |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1692 | { |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1693 | cpuhp_state_remove_instance_nocalls(CPUHP_BLK_MQ_DEAD, |
| 1694 | &hctx->cpuhp_dead); |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1695 | } |
| 1696 | |
Ming Lei | c3b4afc | 2015-06-04 22:25:04 +0800 | [diff] [blame] | 1697 | /* hctx->ctxs will be freed in queue's release handler */ |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1698 | static void blk_mq_exit_hctx(struct request_queue *q, |
| 1699 | struct blk_mq_tag_set *set, |
| 1700 | struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) |
| 1701 | { |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1702 | unsigned flush_start_tag = set->queue_depth; |
| 1703 | |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1704 | blk_mq_tag_idle(hctx); |
| 1705 | |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1706 | if (set->ops->exit_request) |
| 1707 | set->ops->exit_request(set->driver_data, |
| 1708 | hctx->fq->flush_rq, hctx_idx, |
| 1709 | flush_start_tag + hctx_idx); |
| 1710 | |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1711 | if (set->ops->exit_hctx) |
| 1712 | set->ops->exit_hctx(hctx, hctx_idx); |
| 1713 | |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 1714 | if (hctx->flags & BLK_MQ_F_BLOCKING) |
| 1715 | cleanup_srcu_struct(&hctx->queue_rq_srcu); |
| 1716 | |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1717 | blk_mq_remove_cpuhp(hctx); |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1718 | blk_free_flush_queue(hctx->fq); |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 1719 | sbitmap_free(&hctx->ctx_map); |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1720 | } |
| 1721 | |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1722 | static void blk_mq_exit_hw_queues(struct request_queue *q, |
| 1723 | struct blk_mq_tag_set *set, int nr_queue) |
| 1724 | { |
| 1725 | struct blk_mq_hw_ctx *hctx; |
| 1726 | unsigned int i; |
| 1727 | |
| 1728 | queue_for_each_hw_ctx(q, hctx, i) { |
| 1729 | if (i == nr_queue) |
| 1730 | break; |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1731 | blk_mq_exit_hctx(q, set, hctx, i); |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1732 | } |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1733 | } |
| 1734 | |
| 1735 | static void blk_mq_free_hw_queues(struct request_queue *q, |
| 1736 | struct blk_mq_tag_set *set) |
| 1737 | { |
| 1738 | struct blk_mq_hw_ctx *hctx; |
| 1739 | unsigned int i; |
| 1740 | |
Ming Lei | e09aae7 | 2015-01-29 20:17:27 +0800 | [diff] [blame] | 1741 | queue_for_each_hw_ctx(q, hctx, i) |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1742 | free_cpumask_var(hctx->cpumask); |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1743 | } |
| 1744 | |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1745 | static int blk_mq_init_hctx(struct request_queue *q, |
| 1746 | struct blk_mq_tag_set *set, |
| 1747 | struct blk_mq_hw_ctx *hctx, unsigned hctx_idx) |
| 1748 | { |
| 1749 | int node; |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1750 | unsigned flush_start_tag = set->queue_depth; |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1751 | |
| 1752 | node = hctx->numa_node; |
| 1753 | if (node == NUMA_NO_NODE) |
| 1754 | node = hctx->numa_node = set->numa_node; |
| 1755 | |
Jens Axboe | 27489a3 | 2016-08-24 15:54:25 -0600 | [diff] [blame] | 1756 | INIT_WORK(&hctx->run_work, blk_mq_run_work_fn); |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1757 | INIT_DELAYED_WORK(&hctx->delay_work, blk_mq_delay_work_fn); |
| 1758 | spin_lock_init(&hctx->lock); |
| 1759 | INIT_LIST_HEAD(&hctx->dispatch); |
| 1760 | hctx->queue = q; |
| 1761 | hctx->queue_num = hctx_idx; |
Jeff Moyer | 2404e60 | 2015-11-03 10:40:06 -0500 | [diff] [blame] | 1762 | hctx->flags = set->flags & ~BLK_MQ_F_TAG_SHARED; |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1763 | |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1764 | cpuhp_state_add_instance_nocalls(CPUHP_BLK_MQ_DEAD, &hctx->cpuhp_dead); |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1765 | |
| 1766 | hctx->tags = set->tags[hctx_idx]; |
| 1767 | |
| 1768 | /* |
| 1769 | * Allocate space for all possible cpus to avoid allocation at |
| 1770 | * runtime |
| 1771 | */ |
| 1772 | hctx->ctxs = kmalloc_node(nr_cpu_ids * sizeof(void *), |
| 1773 | GFP_KERNEL, node); |
| 1774 | if (!hctx->ctxs) |
| 1775 | goto unregister_cpu_notifier; |
| 1776 | |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 1777 | if (sbitmap_init_node(&hctx->ctx_map, nr_cpu_ids, ilog2(8), GFP_KERNEL, |
| 1778 | node)) |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1779 | goto free_ctxs; |
| 1780 | |
| 1781 | hctx->nr_ctx = 0; |
| 1782 | |
| 1783 | if (set->ops->init_hctx && |
| 1784 | set->ops->init_hctx(hctx, set->driver_data, hctx_idx)) |
| 1785 | goto free_bitmap; |
| 1786 | |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1787 | hctx->fq = blk_alloc_flush_queue(q, hctx->numa_node, set->cmd_size); |
| 1788 | if (!hctx->fq) |
| 1789 | goto exit_hctx; |
| 1790 | |
| 1791 | if (set->ops->init_request && |
| 1792 | set->ops->init_request(set->driver_data, |
| 1793 | hctx->fq->flush_rq, hctx_idx, |
| 1794 | flush_start_tag + hctx_idx, node)) |
| 1795 | goto free_fq; |
| 1796 | |
Bart Van Assche | 6a83e74 | 2016-11-02 10:09:51 -0600 | [diff] [blame] | 1797 | if (hctx->flags & BLK_MQ_F_BLOCKING) |
| 1798 | init_srcu_struct(&hctx->queue_rq_srcu); |
| 1799 | |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1800 | return 0; |
| 1801 | |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1802 | free_fq: |
| 1803 | kfree(hctx->fq); |
| 1804 | exit_hctx: |
| 1805 | if (set->ops->exit_hctx) |
| 1806 | set->ops->exit_hctx(hctx, hctx_idx); |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1807 | free_bitmap: |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 1808 | sbitmap_free(&hctx->ctx_map); |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1809 | free_ctxs: |
| 1810 | kfree(hctx->ctxs); |
| 1811 | unregister_cpu_notifier: |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 1812 | blk_mq_remove_cpuhp(hctx); |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1813 | return -1; |
| 1814 | } |
| 1815 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1816 | static void blk_mq_init_cpu_queues(struct request_queue *q, |
| 1817 | unsigned int nr_hw_queues) |
| 1818 | { |
| 1819 | unsigned int i; |
| 1820 | |
| 1821 | for_each_possible_cpu(i) { |
| 1822 | struct blk_mq_ctx *__ctx = per_cpu_ptr(q->queue_ctx, i); |
| 1823 | struct blk_mq_hw_ctx *hctx; |
| 1824 | |
| 1825 | memset(__ctx, 0, sizeof(*__ctx)); |
| 1826 | __ctx->cpu = i; |
| 1827 | spin_lock_init(&__ctx->lock); |
| 1828 | INIT_LIST_HEAD(&__ctx->rq_list); |
| 1829 | __ctx->queue = q; |
Jens Axboe | cf43e6b | 2016-11-07 21:32:37 -0700 | [diff] [blame] | 1830 | blk_stat_init(&__ctx->stat[BLK_STAT_READ]); |
| 1831 | blk_stat_init(&__ctx->stat[BLK_STAT_WRITE]); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1832 | |
| 1833 | /* If the cpu isn't online, the cpu is mapped to first hctx */ |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1834 | if (!cpu_online(i)) |
| 1835 | continue; |
| 1836 | |
Christoph Hellwig | 7d7e0f9 | 2016-09-14 16:18:54 +0200 | [diff] [blame] | 1837 | hctx = blk_mq_map_queue(q, i); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1838 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1839 | /* |
| 1840 | * Set local node, IFF we have more than one hw queue. If |
| 1841 | * not, we remain on the home node of the device |
| 1842 | */ |
| 1843 | if (nr_hw_queues > 1 && hctx->numa_node == NUMA_NO_NODE) |
Raghavendra K T | bffed45 | 2015-12-02 16:59:05 +0530 | [diff] [blame] | 1844 | hctx->numa_node = local_memory_node(cpu_to_node(i)); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1845 | } |
| 1846 | } |
| 1847 | |
Akinobu Mita | 5778322 | 2015-09-27 02:09:23 +0900 | [diff] [blame] | 1848 | static void blk_mq_map_swqueue(struct request_queue *q, |
| 1849 | const struct cpumask *online_mask) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1850 | { |
| 1851 | unsigned int i; |
| 1852 | struct blk_mq_hw_ctx *hctx; |
| 1853 | struct blk_mq_ctx *ctx; |
Ming Lei | 2a34c08 | 2015-04-21 10:00:20 +0800 | [diff] [blame] | 1854 | struct blk_mq_tag_set *set = q->tag_set; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1855 | |
Akinobu Mita | 60de074 | 2015-09-27 02:09:25 +0900 | [diff] [blame] | 1856 | /* |
| 1857 | * Avoid others reading imcomplete hctx->cpumask through sysfs |
| 1858 | */ |
| 1859 | mutex_lock(&q->sysfs_lock); |
| 1860 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1861 | queue_for_each_hw_ctx(q, hctx, i) { |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1862 | cpumask_clear(hctx->cpumask); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1863 | hctx->nr_ctx = 0; |
| 1864 | } |
| 1865 | |
| 1866 | /* |
| 1867 | * Map software to hardware queues |
| 1868 | */ |
Thomas Gleixner | 897bb0c | 2016-03-19 11:30:33 +0100 | [diff] [blame] | 1869 | for_each_possible_cpu(i) { |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1870 | /* If the cpu isn't online, the cpu is mapped to first hctx */ |
Akinobu Mita | 5778322 | 2015-09-27 02:09:23 +0900 | [diff] [blame] | 1871 | if (!cpumask_test_cpu(i, online_mask)) |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1872 | continue; |
| 1873 | |
Thomas Gleixner | 897bb0c | 2016-03-19 11:30:33 +0100 | [diff] [blame] | 1874 | ctx = per_cpu_ptr(q->queue_ctx, i); |
Christoph Hellwig | 7d7e0f9 | 2016-09-14 16:18:54 +0200 | [diff] [blame] | 1875 | hctx = blk_mq_map_queue(q, i); |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 1876 | |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1877 | cpumask_set_cpu(i, hctx->cpumask); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1878 | ctx->index_hw = hctx->nr_ctx; |
| 1879 | hctx->ctxs[hctx->nr_ctx++] = ctx; |
| 1880 | } |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 1881 | |
Akinobu Mita | 60de074 | 2015-09-27 02:09:25 +0900 | [diff] [blame] | 1882 | mutex_unlock(&q->sysfs_lock); |
| 1883 | |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 1884 | queue_for_each_hw_ctx(q, hctx, i) { |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1885 | /* |
Jens Axboe | a68aafa | 2014-08-15 13:19:15 -0600 | [diff] [blame] | 1886 | * If no software queues are mapped to this hardware queue, |
| 1887 | * disable it and free the request entries. |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1888 | */ |
| 1889 | if (!hctx->nr_ctx) { |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1890 | if (set->tags[i]) { |
| 1891 | blk_mq_free_rq_map(set, set->tags[i], i); |
| 1892 | set->tags[i] = NULL; |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1893 | } |
Ming Lei | 2a34c08 | 2015-04-21 10:00:20 +0800 | [diff] [blame] | 1894 | hctx->tags = NULL; |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1895 | continue; |
| 1896 | } |
| 1897 | |
Ming Lei | 2a34c08 | 2015-04-21 10:00:20 +0800 | [diff] [blame] | 1898 | /* unmapped hw queue can be remapped after CPU topo changed */ |
| 1899 | if (!set->tags[i]) |
| 1900 | set->tags[i] = blk_mq_init_rq_map(set, i); |
| 1901 | hctx->tags = set->tags[i]; |
| 1902 | WARN_ON(!hctx->tags); |
| 1903 | |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1904 | /* |
Chong Yuan | 889fa31 | 2015-04-15 11:39:29 -0600 | [diff] [blame] | 1905 | * Set the map size to the number of mapped software queues. |
| 1906 | * This is more accurate and more efficient than looping |
| 1907 | * over all possibly mapped software queues. |
| 1908 | */ |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 1909 | sbitmap_resize(&hctx->ctx_map, hctx->nr_ctx); |
Chong Yuan | 889fa31 | 2015-04-15 11:39:29 -0600 | [diff] [blame] | 1910 | |
| 1911 | /* |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1912 | * Initialize batch roundrobin counts |
| 1913 | */ |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 1914 | hctx->next_cpu = cpumask_first(hctx->cpumask); |
| 1915 | hctx->next_cpu_batch = BLK_MQ_CPU_WORK_BATCH; |
| 1916 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1917 | } |
| 1918 | |
Jeff Moyer | 2404e60 | 2015-11-03 10:40:06 -0500 | [diff] [blame] | 1919 | static void queue_set_hctx_shared(struct request_queue *q, bool shared) |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1920 | { |
| 1921 | struct blk_mq_hw_ctx *hctx; |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1922 | int i; |
| 1923 | |
Jeff Moyer | 2404e60 | 2015-11-03 10:40:06 -0500 | [diff] [blame] | 1924 | queue_for_each_hw_ctx(q, hctx, i) { |
| 1925 | if (shared) |
| 1926 | hctx->flags |= BLK_MQ_F_TAG_SHARED; |
| 1927 | else |
| 1928 | hctx->flags &= ~BLK_MQ_F_TAG_SHARED; |
| 1929 | } |
| 1930 | } |
| 1931 | |
| 1932 | static void blk_mq_update_tag_set_depth(struct blk_mq_tag_set *set, bool shared) |
| 1933 | { |
| 1934 | struct request_queue *q; |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1935 | |
| 1936 | list_for_each_entry(q, &set->tag_list, tag_set_list) { |
| 1937 | blk_mq_freeze_queue(q); |
Jeff Moyer | 2404e60 | 2015-11-03 10:40:06 -0500 | [diff] [blame] | 1938 | queue_set_hctx_shared(q, shared); |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1939 | blk_mq_unfreeze_queue(q); |
| 1940 | } |
| 1941 | } |
| 1942 | |
| 1943 | static void blk_mq_del_queue_tag_set(struct request_queue *q) |
| 1944 | { |
| 1945 | struct blk_mq_tag_set *set = q->tag_set; |
| 1946 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1947 | mutex_lock(&set->tag_list_lock); |
| 1948 | list_del_init(&q->tag_set_list); |
Jeff Moyer | 2404e60 | 2015-11-03 10:40:06 -0500 | [diff] [blame] | 1949 | if (list_is_singular(&set->tag_list)) { |
| 1950 | /* just transitioned to unshared */ |
| 1951 | set->flags &= ~BLK_MQ_F_TAG_SHARED; |
| 1952 | /* update existing queue */ |
| 1953 | blk_mq_update_tag_set_depth(set, false); |
| 1954 | } |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1955 | mutex_unlock(&set->tag_list_lock); |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1956 | } |
| 1957 | |
| 1958 | static void blk_mq_add_queue_tag_set(struct blk_mq_tag_set *set, |
| 1959 | struct request_queue *q) |
| 1960 | { |
| 1961 | q->tag_set = set; |
| 1962 | |
| 1963 | mutex_lock(&set->tag_list_lock); |
Jeff Moyer | 2404e60 | 2015-11-03 10:40:06 -0500 | [diff] [blame] | 1964 | |
| 1965 | /* Check to see if we're transitioning to shared (from 1 to 2 queues). */ |
| 1966 | if (!list_empty(&set->tag_list) && !(set->flags & BLK_MQ_F_TAG_SHARED)) { |
| 1967 | set->flags |= BLK_MQ_F_TAG_SHARED; |
| 1968 | /* update existing queue */ |
| 1969 | blk_mq_update_tag_set_depth(set, true); |
| 1970 | } |
| 1971 | if (set->flags & BLK_MQ_F_TAG_SHARED) |
| 1972 | queue_set_hctx_shared(q, true); |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1973 | list_add_tail(&q->tag_set_list, &set->tag_list); |
Jeff Moyer | 2404e60 | 2015-11-03 10:40:06 -0500 | [diff] [blame] | 1974 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1975 | mutex_unlock(&set->tag_list_lock); |
| 1976 | } |
| 1977 | |
Ming Lei | e09aae7 | 2015-01-29 20:17:27 +0800 | [diff] [blame] | 1978 | /* |
| 1979 | * It is the actual release handler for mq, but we do it from |
| 1980 | * request queue's release handler for avoiding use-after-free |
| 1981 | * and headache because q->mq_kobj shouldn't have been introduced, |
| 1982 | * but we can't group ctx/kctx kobj without it. |
| 1983 | */ |
| 1984 | void blk_mq_release(struct request_queue *q) |
| 1985 | { |
| 1986 | struct blk_mq_hw_ctx *hctx; |
| 1987 | unsigned int i; |
| 1988 | |
| 1989 | /* hctx kobj stays in hctx */ |
Ming Lei | c3b4afc | 2015-06-04 22:25:04 +0800 | [diff] [blame] | 1990 | queue_for_each_hw_ctx(q, hctx, i) { |
| 1991 | if (!hctx) |
| 1992 | continue; |
| 1993 | kfree(hctx->ctxs); |
Ming Lei | e09aae7 | 2015-01-29 20:17:27 +0800 | [diff] [blame] | 1994 | kfree(hctx); |
Ming Lei | c3b4afc | 2015-06-04 22:25:04 +0800 | [diff] [blame] | 1995 | } |
Ming Lei | e09aae7 | 2015-01-29 20:17:27 +0800 | [diff] [blame] | 1996 | |
Akinobu Mita | a723bab | 2015-09-27 02:09:21 +0900 | [diff] [blame] | 1997 | q->mq_map = NULL; |
| 1998 | |
Ming Lei | e09aae7 | 2015-01-29 20:17:27 +0800 | [diff] [blame] | 1999 | kfree(q->queue_hw_ctx); |
| 2000 | |
| 2001 | /* ctx kobj stays in queue_ctx */ |
| 2002 | free_percpu(q->queue_ctx); |
| 2003 | } |
| 2004 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2005 | struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2006 | { |
Mike Snitzer | b62c21b | 2015-03-12 23:56:02 -0400 | [diff] [blame] | 2007 | struct request_queue *uninit_q, *q; |
| 2008 | |
| 2009 | uninit_q = blk_alloc_queue_node(GFP_KERNEL, set->numa_node); |
| 2010 | if (!uninit_q) |
| 2011 | return ERR_PTR(-ENOMEM); |
| 2012 | |
| 2013 | q = blk_mq_init_allocated_queue(set, uninit_q); |
| 2014 | if (IS_ERR(q)) |
| 2015 | blk_cleanup_queue(uninit_q); |
| 2016 | |
| 2017 | return q; |
| 2018 | } |
| 2019 | EXPORT_SYMBOL(blk_mq_init_queue); |
| 2020 | |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2021 | static void blk_mq_realloc_hw_ctxs(struct blk_mq_tag_set *set, |
| 2022 | struct request_queue *q) |
Mike Snitzer | b62c21b | 2015-03-12 23:56:02 -0400 | [diff] [blame] | 2023 | { |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2024 | int i, j; |
| 2025 | struct blk_mq_hw_ctx **hctxs = q->queue_hw_ctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2026 | |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2027 | blk_mq_sysfs_unregister(q); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2028 | for (i = 0; i < set->nr_hw_queues; i++) { |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2029 | int node; |
Jens Axboe | f14bbe7 | 2014-05-27 12:06:53 -0600 | [diff] [blame] | 2030 | |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2031 | if (hctxs[i]) |
| 2032 | continue; |
| 2033 | |
| 2034 | node = blk_mq_hw_queue_to_node(q->mq_map, i); |
Christoph Hellwig | cdef54d | 2014-05-28 18:11:06 +0200 | [diff] [blame] | 2035 | hctxs[i] = kzalloc_node(sizeof(struct blk_mq_hw_ctx), |
| 2036 | GFP_KERNEL, node); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2037 | if (!hctxs[i]) |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2038 | break; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2039 | |
Jens Axboe | a86073e | 2014-10-13 15:41:54 -0600 | [diff] [blame] | 2040 | if (!zalloc_cpumask_var_node(&hctxs[i]->cpumask, GFP_KERNEL, |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2041 | node)) { |
| 2042 | kfree(hctxs[i]); |
| 2043 | hctxs[i] = NULL; |
| 2044 | break; |
| 2045 | } |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 2046 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 2047 | atomic_set(&hctxs[i]->nr_active, 0); |
Jens Axboe | f14bbe7 | 2014-05-27 12:06:53 -0600 | [diff] [blame] | 2048 | hctxs[i]->numa_node = node; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2049 | hctxs[i]->queue_num = i; |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2050 | |
| 2051 | if (blk_mq_init_hctx(q, set, hctxs[i], i)) { |
| 2052 | free_cpumask_var(hctxs[i]->cpumask); |
| 2053 | kfree(hctxs[i]); |
| 2054 | hctxs[i] = NULL; |
| 2055 | break; |
| 2056 | } |
| 2057 | blk_mq_hctx_kobj_init(hctxs[i]); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2058 | } |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2059 | for (j = i; j < q->nr_hw_queues; j++) { |
| 2060 | struct blk_mq_hw_ctx *hctx = hctxs[j]; |
| 2061 | |
| 2062 | if (hctx) { |
| 2063 | if (hctx->tags) { |
| 2064 | blk_mq_free_rq_map(set, hctx->tags, j); |
| 2065 | set->tags[j] = NULL; |
| 2066 | } |
| 2067 | blk_mq_exit_hctx(q, set, hctx, j); |
| 2068 | free_cpumask_var(hctx->cpumask); |
| 2069 | kobject_put(&hctx->kobj); |
| 2070 | kfree(hctx->ctxs); |
| 2071 | kfree(hctx); |
| 2072 | hctxs[j] = NULL; |
| 2073 | |
| 2074 | } |
| 2075 | } |
| 2076 | q->nr_hw_queues = i; |
| 2077 | blk_mq_sysfs_register(q); |
| 2078 | } |
| 2079 | |
| 2080 | struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, |
| 2081 | struct request_queue *q) |
| 2082 | { |
Ming Lei | 6684167 | 2016-02-12 15:27:00 +0800 | [diff] [blame] | 2083 | /* mark the queue as mq asap */ |
| 2084 | q->mq_ops = set->ops; |
| 2085 | |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2086 | q->queue_ctx = alloc_percpu(struct blk_mq_ctx); |
| 2087 | if (!q->queue_ctx) |
Ming Lin | c7de572 | 2016-05-25 23:23:27 -0700 | [diff] [blame] | 2088 | goto err_exit; |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2089 | |
| 2090 | q->queue_hw_ctx = kzalloc_node(nr_cpu_ids * sizeof(*(q->queue_hw_ctx)), |
| 2091 | GFP_KERNEL, set->numa_node); |
| 2092 | if (!q->queue_hw_ctx) |
| 2093 | goto err_percpu; |
| 2094 | |
Christoph Hellwig | bdd17e7 | 2016-09-14 16:18:53 +0200 | [diff] [blame] | 2095 | q->mq_map = set->mq_map; |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2096 | |
| 2097 | blk_mq_realloc_hw_ctxs(set, q); |
| 2098 | if (!q->nr_hw_queues) |
| 2099 | goto err_hctxs; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2100 | |
Christoph Hellwig | 287922eb | 2015-10-30 20:57:30 +0800 | [diff] [blame] | 2101 | INIT_WORK(&q->timeout_work, blk_mq_timeout_work); |
Ming Lei | e56f698 | 2015-07-16 19:53:22 +0800 | [diff] [blame] | 2102 | blk_queue_rq_timeout(q, set->timeout ? set->timeout : 30 * HZ); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2103 | |
| 2104 | q->nr_queues = nr_cpu_ids; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2105 | |
Jens Axboe | 94eddfb | 2013-11-19 09:25:07 -0700 | [diff] [blame] | 2106 | q->queue_flags |= QUEUE_FLAG_MQ_DEFAULT; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2107 | |
Jens Axboe | 05f1dd5 | 2014-05-29 09:53:32 -0600 | [diff] [blame] | 2108 | if (!(set->flags & BLK_MQ_F_SG_MERGE)) |
| 2109 | q->queue_flags |= 1 << QUEUE_FLAG_NO_SG_MERGE; |
| 2110 | |
Christoph Hellwig | 1be036e | 2014-02-07 10:22:39 -0800 | [diff] [blame] | 2111 | q->sg_reserved_size = INT_MAX; |
| 2112 | |
Mike Snitzer | 2849450 | 2016-09-14 13:28:30 -0400 | [diff] [blame] | 2113 | INIT_DELAYED_WORK(&q->requeue_work, blk_mq_requeue_work); |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 2114 | INIT_LIST_HEAD(&q->requeue_list); |
| 2115 | spin_lock_init(&q->requeue_lock); |
| 2116 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 2117 | if (q->nr_hw_queues > 1) |
| 2118 | blk_queue_make_request(q, blk_mq_make_request); |
| 2119 | else |
| 2120 | blk_queue_make_request(q, blk_sq_make_request); |
| 2121 | |
Jens Axboe | eba7176 | 2014-05-20 15:17:27 -0600 | [diff] [blame] | 2122 | /* |
| 2123 | * Do this after blk_queue_make_request() overrides it... |
| 2124 | */ |
| 2125 | q->nr_requests = set->queue_depth; |
| 2126 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2127 | if (set->ops->complete) |
| 2128 | blk_queue_softirq_done(q, set->ops->complete); |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 2129 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2130 | blk_mq_init_cpu_queues(q, set->nr_hw_queues); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2131 | |
Akinobu Mita | 5778322 | 2015-09-27 02:09:23 +0900 | [diff] [blame] | 2132 | get_online_cpus(); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2133 | mutex_lock(&all_q_mutex); |
Akinobu Mita | 4593fdb | 2015-09-27 02:09:20 +0900 | [diff] [blame] | 2134 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2135 | list_add_tail(&q->all_q_node, &all_q_list); |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 2136 | blk_mq_add_queue_tag_set(set, q); |
Akinobu Mita | 5778322 | 2015-09-27 02:09:23 +0900 | [diff] [blame] | 2137 | blk_mq_map_swqueue(q, cpu_online_mask); |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 2138 | |
Akinobu Mita | 4593fdb | 2015-09-27 02:09:20 +0900 | [diff] [blame] | 2139 | mutex_unlock(&all_q_mutex); |
Akinobu Mita | 5778322 | 2015-09-27 02:09:23 +0900 | [diff] [blame] | 2140 | put_online_cpus(); |
Akinobu Mita | 4593fdb | 2015-09-27 02:09:20 +0900 | [diff] [blame] | 2141 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2142 | return q; |
Christoph Hellwig | 1874198 | 2014-02-10 09:29:00 -0700 | [diff] [blame] | 2143 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2144 | err_hctxs: |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2145 | kfree(q->queue_hw_ctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2146 | err_percpu: |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2147 | free_percpu(q->queue_ctx); |
Ming Lin | c7de572 | 2016-05-25 23:23:27 -0700 | [diff] [blame] | 2148 | err_exit: |
| 2149 | q->mq_ops = NULL; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2150 | return ERR_PTR(-ENOMEM); |
| 2151 | } |
Mike Snitzer | b62c21b | 2015-03-12 23:56:02 -0400 | [diff] [blame] | 2152 | EXPORT_SYMBOL(blk_mq_init_allocated_queue); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2153 | |
| 2154 | void blk_mq_free_queue(struct request_queue *q) |
| 2155 | { |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 2156 | struct blk_mq_tag_set *set = q->tag_set; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2157 | |
Akinobu Mita | 0e62636 | 2015-09-27 02:09:22 +0900 | [diff] [blame] | 2158 | mutex_lock(&all_q_mutex); |
| 2159 | list_del_init(&q->all_q_node); |
| 2160 | mutex_unlock(&all_q_mutex); |
| 2161 | |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 2162 | wbt_exit(q); |
| 2163 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 2164 | blk_mq_del_queue_tag_set(q); |
| 2165 | |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 2166 | blk_mq_exit_hw_queues(q, set, set->nr_hw_queues); |
| 2167 | blk_mq_free_hw_queues(q, set); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2168 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2169 | |
| 2170 | /* Basically redo blk_mq_init_queue with queue frozen */ |
Akinobu Mita | 5778322 | 2015-09-27 02:09:23 +0900 | [diff] [blame] | 2171 | static void blk_mq_queue_reinit(struct request_queue *q, |
| 2172 | const struct cpumask *online_mask) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2173 | { |
Christoph Hellwig | 4ecd4fe | 2015-05-07 09:38:13 +0200 | [diff] [blame] | 2174 | WARN_ON_ONCE(!atomic_read(&q->mq_freeze_depth)); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2175 | |
Jens Axboe | 67aec14 | 2014-05-30 08:25:36 -0600 | [diff] [blame] | 2176 | blk_mq_sysfs_unregister(q); |
| 2177 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2178 | /* |
| 2179 | * redo blk_mq_init_cpu_queues and blk_mq_init_hw_queues. FIXME: maybe |
| 2180 | * we should change hctx numa_node according to new topology (this |
| 2181 | * involves free and re-allocate memory, worthy doing?) |
| 2182 | */ |
| 2183 | |
Akinobu Mita | 5778322 | 2015-09-27 02:09:23 +0900 | [diff] [blame] | 2184 | blk_mq_map_swqueue(q, online_mask); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2185 | |
Jens Axboe | 67aec14 | 2014-05-30 08:25:36 -0600 | [diff] [blame] | 2186 | blk_mq_sysfs_register(q); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2187 | } |
| 2188 | |
Sebastian Andrzej Siewior | 65d5291 | 2016-09-22 08:05:19 -0600 | [diff] [blame] | 2189 | /* |
| 2190 | * New online cpumask which is going to be set in this hotplug event. |
| 2191 | * Declare this cpumasks as global as cpu-hotplug operation is invoked |
| 2192 | * one-by-one and dynamically allocating this could result in a failure. |
| 2193 | */ |
| 2194 | static struct cpumask cpuhp_online_new; |
| 2195 | |
| 2196 | static void blk_mq_queue_reinit_work(void) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2197 | { |
| 2198 | struct request_queue *q; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2199 | |
| 2200 | mutex_lock(&all_q_mutex); |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 2201 | /* |
| 2202 | * We need to freeze and reinit all existing queues. Freezing |
| 2203 | * involves synchronous wait for an RCU grace period and doing it |
| 2204 | * one by one may take a long time. Start freezing all queues in |
| 2205 | * one swoop and then wait for the completions so that freezing can |
| 2206 | * take place in parallel. |
| 2207 | */ |
| 2208 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 2209 | blk_mq_freeze_queue_start(q); |
Ming Lei | f054b56 | 2015-04-21 10:00:19 +0800 | [diff] [blame] | 2210 | list_for_each_entry(q, &all_q_list, all_q_node) { |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 2211 | blk_mq_freeze_queue_wait(q); |
| 2212 | |
Ming Lei | f054b56 | 2015-04-21 10:00:19 +0800 | [diff] [blame] | 2213 | /* |
| 2214 | * timeout handler can't touch hw queue during the |
| 2215 | * reinitialization |
| 2216 | */ |
| 2217 | del_timer_sync(&q->timeout); |
| 2218 | } |
| 2219 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2220 | list_for_each_entry(q, &all_q_list, all_q_node) |
Sebastian Andrzej Siewior | 65d5291 | 2016-09-22 08:05:19 -0600 | [diff] [blame] | 2221 | blk_mq_queue_reinit(q, &cpuhp_online_new); |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 2222 | |
| 2223 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 2224 | blk_mq_unfreeze_queue(q); |
| 2225 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2226 | mutex_unlock(&all_q_mutex); |
Sebastian Andrzej Siewior | 65d5291 | 2016-09-22 08:05:19 -0600 | [diff] [blame] | 2227 | } |
| 2228 | |
| 2229 | static int blk_mq_queue_reinit_dead(unsigned int cpu) |
| 2230 | { |
Sebastian Andrzej Siewior | 97a3286 | 2016-09-23 15:02:38 +0200 | [diff] [blame] | 2231 | cpumask_copy(&cpuhp_online_new, cpu_online_mask); |
Sebastian Andrzej Siewior | 65d5291 | 2016-09-22 08:05:19 -0600 | [diff] [blame] | 2232 | blk_mq_queue_reinit_work(); |
| 2233 | return 0; |
| 2234 | } |
| 2235 | |
| 2236 | /* |
| 2237 | * Before hotadded cpu starts handling requests, new mappings must be |
| 2238 | * established. Otherwise, these requests in hw queue might never be |
| 2239 | * dispatched. |
| 2240 | * |
| 2241 | * For example, there is a single hw queue (hctx) and two CPU queues (ctx0 |
| 2242 | * for CPU0, and ctx1 for CPU1). |
| 2243 | * |
| 2244 | * Now CPU1 is just onlined and a request is inserted into ctx1->rq_list |
| 2245 | * and set bit0 in pending bitmap as ctx1->index_hw is still zero. |
| 2246 | * |
| 2247 | * And then while running hw queue, flush_busy_ctxs() finds bit0 is set in |
| 2248 | * pending bitmap and tries to retrieve requests in hctx->ctxs[0]->rq_list. |
| 2249 | * But htx->ctxs[0] is a pointer to ctx0, so the request in ctx1->rq_list |
| 2250 | * is ignored. |
| 2251 | */ |
| 2252 | static int blk_mq_queue_reinit_prepare(unsigned int cpu) |
| 2253 | { |
| 2254 | cpumask_copy(&cpuhp_online_new, cpu_online_mask); |
| 2255 | cpumask_set_cpu(cpu, &cpuhp_online_new); |
| 2256 | blk_mq_queue_reinit_work(); |
| 2257 | return 0; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2258 | } |
| 2259 | |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 2260 | static int __blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) |
| 2261 | { |
| 2262 | int i; |
| 2263 | |
| 2264 | for (i = 0; i < set->nr_hw_queues; i++) { |
| 2265 | set->tags[i] = blk_mq_init_rq_map(set, i); |
| 2266 | if (!set->tags[i]) |
| 2267 | goto out_unwind; |
| 2268 | } |
| 2269 | |
| 2270 | return 0; |
| 2271 | |
| 2272 | out_unwind: |
| 2273 | while (--i >= 0) |
| 2274 | blk_mq_free_rq_map(set, set->tags[i], i); |
| 2275 | |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 2276 | return -ENOMEM; |
| 2277 | } |
| 2278 | |
| 2279 | /* |
| 2280 | * Allocate the request maps associated with this tag_set. Note that this |
| 2281 | * may reduce the depth asked for, if memory is tight. set->queue_depth |
| 2282 | * will be updated to reflect the allocated depth. |
| 2283 | */ |
| 2284 | static int blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) |
| 2285 | { |
| 2286 | unsigned int depth; |
| 2287 | int err; |
| 2288 | |
| 2289 | depth = set->queue_depth; |
| 2290 | do { |
| 2291 | err = __blk_mq_alloc_rq_maps(set); |
| 2292 | if (!err) |
| 2293 | break; |
| 2294 | |
| 2295 | set->queue_depth >>= 1; |
| 2296 | if (set->queue_depth < set->reserved_tags + BLK_MQ_TAG_MIN) { |
| 2297 | err = -ENOMEM; |
| 2298 | break; |
| 2299 | } |
| 2300 | } while (set->queue_depth); |
| 2301 | |
| 2302 | if (!set->queue_depth || err) { |
| 2303 | pr_err("blk-mq: failed to allocate request map\n"); |
| 2304 | return -ENOMEM; |
| 2305 | } |
| 2306 | |
| 2307 | if (depth != set->queue_depth) |
| 2308 | pr_info("blk-mq: reduced tag depth (%u -> %u)\n", |
| 2309 | depth, set->queue_depth); |
| 2310 | |
| 2311 | return 0; |
| 2312 | } |
| 2313 | |
Jens Axboe | a4391c6 | 2014-06-05 15:21:56 -0600 | [diff] [blame] | 2314 | /* |
| 2315 | * Alloc a tag set to be associated with one or more request queues. |
| 2316 | * May fail with EINVAL for various error conditions. May adjust the |
| 2317 | * requested depth down, if if it too large. In that case, the set |
| 2318 | * value will be stored in set->queue_depth. |
| 2319 | */ |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2320 | int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) |
| 2321 | { |
Christoph Hellwig | da695ba | 2016-09-14 16:18:55 +0200 | [diff] [blame] | 2322 | int ret; |
| 2323 | |
Bart Van Assche | 205fb5f | 2014-10-30 14:45:11 +0100 | [diff] [blame] | 2324 | BUILD_BUG_ON(BLK_MQ_MAX_DEPTH > 1 << BLK_MQ_UNIQUE_TAG_BITS); |
| 2325 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2326 | if (!set->nr_hw_queues) |
| 2327 | return -EINVAL; |
Jens Axboe | a4391c6 | 2014-06-05 15:21:56 -0600 | [diff] [blame] | 2328 | if (!set->queue_depth) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2329 | return -EINVAL; |
| 2330 | if (set->queue_depth < set->reserved_tags + BLK_MQ_TAG_MIN) |
| 2331 | return -EINVAL; |
| 2332 | |
Christoph Hellwig | 7d7e0f9 | 2016-09-14 16:18:54 +0200 | [diff] [blame] | 2333 | if (!set->ops->queue_rq) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2334 | return -EINVAL; |
| 2335 | |
Jens Axboe | a4391c6 | 2014-06-05 15:21:56 -0600 | [diff] [blame] | 2336 | if (set->queue_depth > BLK_MQ_MAX_DEPTH) { |
| 2337 | pr_info("blk-mq: reduced tag depth to %u\n", |
| 2338 | BLK_MQ_MAX_DEPTH); |
| 2339 | set->queue_depth = BLK_MQ_MAX_DEPTH; |
| 2340 | } |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2341 | |
Shaohua Li | 6637fad | 2014-11-30 16:00:58 -0800 | [diff] [blame] | 2342 | /* |
| 2343 | * If a crashdump is active, then we are potentially in a very |
| 2344 | * memory constrained environment. Limit us to 1 queue and |
| 2345 | * 64 tags to prevent using too much memory. |
| 2346 | */ |
| 2347 | if (is_kdump_kernel()) { |
| 2348 | set->nr_hw_queues = 1; |
| 2349 | set->queue_depth = min(64U, set->queue_depth); |
| 2350 | } |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2351 | /* |
| 2352 | * There is no use for more h/w queues than cpus. |
| 2353 | */ |
| 2354 | if (set->nr_hw_queues > nr_cpu_ids) |
| 2355 | set->nr_hw_queues = nr_cpu_ids; |
Shaohua Li | 6637fad | 2014-11-30 16:00:58 -0800 | [diff] [blame] | 2356 | |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2357 | set->tags = kzalloc_node(nr_cpu_ids * sizeof(struct blk_mq_tags *), |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2358 | GFP_KERNEL, set->numa_node); |
| 2359 | if (!set->tags) |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 2360 | return -ENOMEM; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2361 | |
Christoph Hellwig | da695ba | 2016-09-14 16:18:55 +0200 | [diff] [blame] | 2362 | ret = -ENOMEM; |
| 2363 | set->mq_map = kzalloc_node(sizeof(*set->mq_map) * nr_cpu_ids, |
| 2364 | GFP_KERNEL, set->numa_node); |
Christoph Hellwig | bdd17e7 | 2016-09-14 16:18:53 +0200 | [diff] [blame] | 2365 | if (!set->mq_map) |
| 2366 | goto out_free_tags; |
| 2367 | |
Christoph Hellwig | da695ba | 2016-09-14 16:18:55 +0200 | [diff] [blame] | 2368 | if (set->ops->map_queues) |
| 2369 | ret = set->ops->map_queues(set); |
| 2370 | else |
| 2371 | ret = blk_mq_map_queues(set); |
| 2372 | if (ret) |
| 2373 | goto out_free_mq_map; |
| 2374 | |
| 2375 | ret = blk_mq_alloc_rq_maps(set); |
| 2376 | if (ret) |
Christoph Hellwig | bdd17e7 | 2016-09-14 16:18:53 +0200 | [diff] [blame] | 2377 | goto out_free_mq_map; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2378 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 2379 | mutex_init(&set->tag_list_lock); |
| 2380 | INIT_LIST_HEAD(&set->tag_list); |
| 2381 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2382 | return 0; |
Christoph Hellwig | bdd17e7 | 2016-09-14 16:18:53 +0200 | [diff] [blame] | 2383 | |
| 2384 | out_free_mq_map: |
| 2385 | kfree(set->mq_map); |
| 2386 | set->mq_map = NULL; |
| 2387 | out_free_tags: |
Robert Elliott | 5676e7b | 2014-09-02 11:38:44 -0500 | [diff] [blame] | 2388 | kfree(set->tags); |
| 2389 | set->tags = NULL; |
Christoph Hellwig | da695ba | 2016-09-14 16:18:55 +0200 | [diff] [blame] | 2390 | return ret; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2391 | } |
| 2392 | EXPORT_SYMBOL(blk_mq_alloc_tag_set); |
| 2393 | |
| 2394 | void blk_mq_free_tag_set(struct blk_mq_tag_set *set) |
| 2395 | { |
| 2396 | int i; |
| 2397 | |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2398 | for (i = 0; i < nr_cpu_ids; i++) { |
Junichi Nomura | f42d79a | 2015-10-14 05:02:15 +0000 | [diff] [blame] | 2399 | if (set->tags[i]) |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 2400 | blk_mq_free_rq_map(set, set->tags[i], i); |
| 2401 | } |
| 2402 | |
Christoph Hellwig | bdd17e7 | 2016-09-14 16:18:53 +0200 | [diff] [blame] | 2403 | kfree(set->mq_map); |
| 2404 | set->mq_map = NULL; |
| 2405 | |
Ming Lei | 981bd18 | 2014-04-24 00:07:34 +0800 | [diff] [blame] | 2406 | kfree(set->tags); |
Robert Elliott | 5676e7b | 2014-09-02 11:38:44 -0500 | [diff] [blame] | 2407 | set->tags = NULL; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2408 | } |
| 2409 | EXPORT_SYMBOL(blk_mq_free_tag_set); |
| 2410 | |
Jens Axboe | e3a2b3f | 2014-05-20 11:49:02 -0600 | [diff] [blame] | 2411 | int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) |
| 2412 | { |
| 2413 | struct blk_mq_tag_set *set = q->tag_set; |
| 2414 | struct blk_mq_hw_ctx *hctx; |
| 2415 | int i, ret; |
| 2416 | |
| 2417 | if (!set || nr > set->queue_depth) |
| 2418 | return -EINVAL; |
| 2419 | |
| 2420 | ret = 0; |
| 2421 | queue_for_each_hw_ctx(q, hctx, i) { |
Keith Busch | e9137d4 | 2016-02-18 14:56:35 -0700 | [diff] [blame] | 2422 | if (!hctx->tags) |
| 2423 | continue; |
Jens Axboe | e3a2b3f | 2014-05-20 11:49:02 -0600 | [diff] [blame] | 2424 | ret = blk_mq_tag_update_depth(hctx->tags, nr); |
| 2425 | if (ret) |
| 2426 | break; |
| 2427 | } |
| 2428 | |
| 2429 | if (!ret) |
| 2430 | q->nr_requests = nr; |
| 2431 | |
| 2432 | return ret; |
| 2433 | } |
| 2434 | |
Keith Busch | 868f2f0 | 2015-12-17 17:08:14 -0700 | [diff] [blame] | 2435 | void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues) |
| 2436 | { |
| 2437 | struct request_queue *q; |
| 2438 | |
| 2439 | if (nr_hw_queues > nr_cpu_ids) |
| 2440 | nr_hw_queues = nr_cpu_ids; |
| 2441 | if (nr_hw_queues < 1 || nr_hw_queues == set->nr_hw_queues) |
| 2442 | return; |
| 2443 | |
| 2444 | list_for_each_entry(q, &set->tag_list, tag_set_list) |
| 2445 | blk_mq_freeze_queue(q); |
| 2446 | |
| 2447 | set->nr_hw_queues = nr_hw_queues; |
| 2448 | list_for_each_entry(q, &set->tag_list, tag_set_list) { |
| 2449 | blk_mq_realloc_hw_ctxs(set, q); |
| 2450 | |
| 2451 | if (q->nr_hw_queues > 1) |
| 2452 | blk_queue_make_request(q, blk_mq_make_request); |
| 2453 | else |
| 2454 | blk_queue_make_request(q, blk_sq_make_request); |
| 2455 | |
| 2456 | blk_mq_queue_reinit(q, cpu_online_mask); |
| 2457 | } |
| 2458 | |
| 2459 | list_for_each_entry(q, &set->tag_list, tag_set_list) |
| 2460 | blk_mq_unfreeze_queue(q); |
| 2461 | } |
| 2462 | EXPORT_SYMBOL_GPL(blk_mq_update_nr_hw_queues); |
| 2463 | |
Jens Axboe | bbd7bb7 | 2016-11-04 09:34:34 -0600 | [diff] [blame^] | 2464 | static bool __blk_mq_poll(struct blk_mq_hw_ctx *hctx, struct request *rq) |
| 2465 | { |
| 2466 | struct request_queue *q = hctx->queue; |
| 2467 | long state; |
| 2468 | |
| 2469 | hctx->poll_considered++; |
| 2470 | |
| 2471 | state = current->state; |
| 2472 | while (!need_resched()) { |
| 2473 | int ret; |
| 2474 | |
| 2475 | hctx->poll_invoked++; |
| 2476 | |
| 2477 | ret = q->mq_ops->poll(hctx, rq->tag); |
| 2478 | if (ret > 0) { |
| 2479 | hctx->poll_success++; |
| 2480 | set_current_state(TASK_RUNNING); |
| 2481 | return true; |
| 2482 | } |
| 2483 | |
| 2484 | if (signal_pending_state(state, current)) |
| 2485 | set_current_state(TASK_RUNNING); |
| 2486 | |
| 2487 | if (current->state == TASK_RUNNING) |
| 2488 | return true; |
| 2489 | if (ret < 0) |
| 2490 | break; |
| 2491 | cpu_relax(); |
| 2492 | } |
| 2493 | |
| 2494 | return false; |
| 2495 | } |
| 2496 | |
| 2497 | bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie) |
| 2498 | { |
| 2499 | struct blk_mq_hw_ctx *hctx; |
| 2500 | struct blk_plug *plug; |
| 2501 | struct request *rq; |
| 2502 | |
| 2503 | if (!q->mq_ops || !q->mq_ops->poll || !blk_qc_t_valid(cookie) || |
| 2504 | !test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) |
| 2505 | return false; |
| 2506 | |
| 2507 | plug = current->plug; |
| 2508 | if (plug) |
| 2509 | blk_flush_plug_list(plug, false); |
| 2510 | |
| 2511 | hctx = q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)]; |
| 2512 | rq = blk_mq_tag_to_rq(hctx->tags, blk_qc_t_to_tag(cookie)); |
| 2513 | |
| 2514 | return __blk_mq_poll(hctx, rq); |
| 2515 | } |
| 2516 | EXPORT_SYMBOL_GPL(blk_mq_poll); |
| 2517 | |
Jens Axboe | 676141e | 2014-03-20 13:29:18 -0600 | [diff] [blame] | 2518 | void blk_mq_disable_hotplug(void) |
| 2519 | { |
| 2520 | mutex_lock(&all_q_mutex); |
| 2521 | } |
| 2522 | |
| 2523 | void blk_mq_enable_hotplug(void) |
| 2524 | { |
| 2525 | mutex_unlock(&all_q_mutex); |
| 2526 | } |
| 2527 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2528 | static int __init blk_mq_init(void) |
| 2529 | { |
Thomas Gleixner | 9467f85 | 2016-09-22 08:05:17 -0600 | [diff] [blame] | 2530 | cpuhp_setup_state_multi(CPUHP_BLK_MQ_DEAD, "block/mq:dead", NULL, |
| 2531 | blk_mq_hctx_notify_dead); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2532 | |
Sebastian Andrzej Siewior | 65d5291 | 2016-09-22 08:05:19 -0600 | [diff] [blame] | 2533 | cpuhp_setup_state_nocalls(CPUHP_BLK_MQ_PREPARE, "block/mq:prepare", |
| 2534 | blk_mq_queue_reinit_prepare, |
| 2535 | blk_mq_queue_reinit_dead); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2536 | return 0; |
| 2537 | } |
| 2538 | subsys_initcall(blk_mq_init); |