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> |
| 12 | #include <linux/mm.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/slab.h> |
| 15 | #include <linux/workqueue.h> |
| 16 | #include <linux/smp.h> |
| 17 | #include <linux/llist.h> |
| 18 | #include <linux/list_sort.h> |
| 19 | #include <linux/cpu.h> |
| 20 | #include <linux/cache.h> |
| 21 | #include <linux/sched/sysctl.h> |
| 22 | #include <linux/delay.h> |
Jens Axboe | aedcd72 | 2014-09-17 08:27:03 -0600 | [diff] [blame] | 23 | #include <linux/crash_dump.h> |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 24 | |
| 25 | #include <trace/events/block.h> |
| 26 | |
| 27 | #include <linux/blk-mq.h> |
| 28 | #include "blk.h" |
| 29 | #include "blk-mq.h" |
| 30 | #include "blk-mq-tag.h" |
| 31 | |
| 32 | static DEFINE_MUTEX(all_q_mutex); |
| 33 | static LIST_HEAD(all_q_list); |
| 34 | |
| 35 | static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx); |
Jens Axboe | 201f201 | 2015-02-10 13:31:34 -0700 | [diff] [blame] | 36 | static void blk_mq_run_queues(struct request_queue *q); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 37 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 38 | /* |
| 39 | * Check if any of the ctx's have pending work in this hardware queue |
| 40 | */ |
| 41 | static bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx) |
| 42 | { |
| 43 | unsigned int i; |
| 44 | |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 45 | for (i = 0; i < hctx->ctx_map.map_size; i++) |
| 46 | if (hctx->ctx_map.map[i].word) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 47 | return true; |
| 48 | |
| 49 | return false; |
| 50 | } |
| 51 | |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 52 | static inline struct blk_align_bitmap *get_bm(struct blk_mq_hw_ctx *hctx, |
| 53 | struct blk_mq_ctx *ctx) |
| 54 | { |
| 55 | return &hctx->ctx_map.map[ctx->index_hw / hctx->ctx_map.bits_per_word]; |
| 56 | } |
| 57 | |
| 58 | #define CTX_TO_BIT(hctx, ctx) \ |
| 59 | ((ctx)->index_hw & ((hctx)->ctx_map.bits_per_word - 1)) |
| 60 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 61 | /* |
| 62 | * Mark this ctx as having pending work in this hardware queue |
| 63 | */ |
| 64 | static void blk_mq_hctx_mark_pending(struct blk_mq_hw_ctx *hctx, |
| 65 | struct blk_mq_ctx *ctx) |
| 66 | { |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 67 | struct blk_align_bitmap *bm = get_bm(hctx, ctx); |
| 68 | |
| 69 | if (!test_bit(CTX_TO_BIT(hctx, ctx), &bm->word)) |
| 70 | set_bit(CTX_TO_BIT(hctx, ctx), &bm->word); |
| 71 | } |
| 72 | |
| 73 | static void blk_mq_hctx_clear_pending(struct blk_mq_hw_ctx *hctx, |
| 74 | struct blk_mq_ctx *ctx) |
| 75 | { |
| 76 | struct blk_align_bitmap *bm = get_bm(hctx, ctx); |
| 77 | |
| 78 | clear_bit(CTX_TO_BIT(hctx, ctx), &bm->word); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 79 | } |
| 80 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 81 | static int blk_mq_queue_enter(struct request_queue *q) |
| 82 | { |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 83 | while (true) { |
| 84 | int ret; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 85 | |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 86 | if (percpu_ref_tryget_live(&q->mq_usage_counter)) |
| 87 | return 0; |
Keith Busch | 3b632cf | 2014-06-06 10:22:07 -0600 | [diff] [blame] | 88 | |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 89 | ret = wait_event_interruptible(q->mq_freeze_wq, |
| 90 | !q->mq_freeze_depth || blk_queue_dying(q)); |
| 91 | if (blk_queue_dying(q)) |
| 92 | return -ENODEV; |
| 93 | if (ret) |
| 94 | return ret; |
| 95 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | static void blk_mq_queue_exit(struct request_queue *q) |
| 99 | { |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 100 | percpu_ref_put(&q->mq_usage_counter); |
| 101 | } |
| 102 | |
| 103 | static void blk_mq_usage_counter_release(struct percpu_ref *ref) |
| 104 | { |
| 105 | struct request_queue *q = |
| 106 | container_of(ref, struct request_queue, mq_usage_counter); |
| 107 | |
| 108 | wake_up_all(&q->mq_freeze_wq); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 109 | } |
| 110 | |
Keith Busch | b4c6a02 | 2014-12-19 17:54:14 -0700 | [diff] [blame] | 111 | void blk_mq_freeze_queue_start(struct request_queue *q) |
Ming Lei | 43a5e4e | 2013-12-26 21:31:35 +0800 | [diff] [blame] | 112 | { |
Tejun Heo | cddd5d1 | 2014-08-16 08:02:24 -0400 | [diff] [blame] | 113 | bool freeze; |
| 114 | |
Tejun Heo | 72d6f02 | 2014-07-01 10:33:02 -0600 | [diff] [blame] | 115 | spin_lock_irq(q->queue_lock); |
Tejun Heo | cddd5d1 | 2014-08-16 08:02:24 -0400 | [diff] [blame] | 116 | freeze = !q->mq_freeze_depth++; |
Tejun Heo | 72d6f02 | 2014-07-01 10:33:02 -0600 | [diff] [blame] | 117 | spin_unlock_irq(q->queue_lock); |
| 118 | |
Tejun Heo | cddd5d1 | 2014-08-16 08:02:24 -0400 | [diff] [blame] | 119 | if (freeze) { |
Tejun Heo | 9eca804 | 2014-09-24 13:07:33 -0400 | [diff] [blame] | 120 | percpu_ref_kill(&q->mq_usage_counter); |
Jens Axboe | 201f201 | 2015-02-10 13:31:34 -0700 | [diff] [blame] | 121 | blk_mq_run_queues(q); |
Tejun Heo | cddd5d1 | 2014-08-16 08:02:24 -0400 | [diff] [blame] | 122 | } |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 123 | } |
Keith Busch | b4c6a02 | 2014-12-19 17:54:14 -0700 | [diff] [blame] | 124 | EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_start); |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 125 | |
| 126 | static void blk_mq_freeze_queue_wait(struct request_queue *q) |
| 127 | { |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 128 | wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->mq_usage_counter)); |
Ming Lei | 43a5e4e | 2013-12-26 21:31:35 +0800 | [diff] [blame] | 129 | } |
| 130 | |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 131 | /* |
| 132 | * Guarantee no request is in use, so we can change any data structure of |
| 133 | * the queue afterward. |
| 134 | */ |
| 135 | void blk_mq_freeze_queue(struct request_queue *q) |
| 136 | { |
| 137 | blk_mq_freeze_queue_start(q); |
| 138 | blk_mq_freeze_queue_wait(q); |
| 139 | } |
Jens Axboe | c761d96 | 2015-01-02 15:05:12 -0700 | [diff] [blame] | 140 | EXPORT_SYMBOL_GPL(blk_mq_freeze_queue); |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 141 | |
Keith Busch | b4c6a02 | 2014-12-19 17:54:14 -0700 | [diff] [blame] | 142 | void blk_mq_unfreeze_queue(struct request_queue *q) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 143 | { |
Tejun Heo | cddd5d1 | 2014-08-16 08:02:24 -0400 | [diff] [blame] | 144 | bool wake; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 145 | |
| 146 | spin_lock_irq(q->queue_lock); |
Tejun Heo | 780db20 | 2014-07-01 10:31:13 -0600 | [diff] [blame] | 147 | wake = !--q->mq_freeze_depth; |
| 148 | WARN_ON_ONCE(q->mq_freeze_depth < 0); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 149 | spin_unlock_irq(q->queue_lock); |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 150 | if (wake) { |
| 151 | percpu_ref_reinit(&q->mq_usage_counter); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 152 | wake_up_all(&q->mq_freeze_wq); |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 153 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 154 | } |
Keith Busch | b4c6a02 | 2014-12-19 17:54:14 -0700 | [diff] [blame] | 155 | EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 156 | |
Jens Axboe | aed3ea9 | 2014-12-22 14:04:42 -0700 | [diff] [blame] | 157 | void blk_mq_wake_waiters(struct request_queue *q) |
| 158 | { |
| 159 | struct blk_mq_hw_ctx *hctx; |
| 160 | unsigned int i; |
| 161 | |
| 162 | queue_for_each_hw_ctx(q, hctx, i) |
| 163 | if (blk_mq_hw_queue_mapped(hctx)) |
| 164 | blk_mq_tag_wakeup_all(hctx->tags, true); |
Keith Busch | 3fd5940 | 2015-01-08 08:53:56 -0700 | [diff] [blame] | 165 | |
| 166 | /* |
| 167 | * If we are called because the queue has now been marked as |
| 168 | * dying, we need to ensure that processes currently waiting on |
| 169 | * the queue are notified as well. |
| 170 | */ |
| 171 | wake_up_all(&q->mq_freeze_wq); |
Jens Axboe | aed3ea9 | 2014-12-22 14:04:42 -0700 | [diff] [blame] | 172 | } |
| 173 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 174 | bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx) |
| 175 | { |
| 176 | return blk_mq_has_free_tags(hctx->tags); |
| 177 | } |
| 178 | EXPORT_SYMBOL(blk_mq_can_queue); |
| 179 | |
Jens Axboe | 94eddfb | 2013-11-19 09:25:07 -0700 | [diff] [blame] | 180 | static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, |
| 181 | struct request *rq, unsigned int rw_flags) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 182 | { |
Jens Axboe | 94eddfb | 2013-11-19 09:25:07 -0700 | [diff] [blame] | 183 | if (blk_queue_io_stat(q)) |
| 184 | rw_flags |= REQ_IO_STAT; |
| 185 | |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 186 | INIT_LIST_HEAD(&rq->queuelist); |
| 187 | /* csd/requeue_work/fifo_time is initialized before use */ |
| 188 | rq->q = q; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 189 | rq->mq_ctx = ctx; |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 190 | rq->cmd_flags |= rw_flags; |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 191 | /* do not touch atomic flags, it needs atomic ops against the timer */ |
| 192 | rq->cpu = -1; |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 193 | INIT_HLIST_NODE(&rq->hash); |
| 194 | RB_CLEAR_NODE(&rq->rb_node); |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 195 | rq->rq_disk = NULL; |
| 196 | rq->part = NULL; |
Jens Axboe | 3ee3237 | 2014-06-09 09:36:53 -0600 | [diff] [blame] | 197 | rq->start_time = jiffies; |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 198 | #ifdef CONFIG_BLK_CGROUP |
| 199 | rq->rl = NULL; |
Ming Lei | 0fec08b | 2014-01-03 10:00:08 -0700 | [diff] [blame] | 200 | set_start_time_ns(rq); |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 201 | rq->io_start_time_ns = 0; |
| 202 | #endif |
| 203 | rq->nr_phys_segments = 0; |
| 204 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| 205 | rq->nr_integrity_segments = 0; |
| 206 | #endif |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 207 | rq->special = NULL; |
| 208 | /* tag was already set */ |
| 209 | rq->errors = 0; |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 210 | |
Tony Battersby | 6f4a1626 | 2014-08-22 15:53:39 -0400 | [diff] [blame] | 211 | rq->cmd = rq->__cmd; |
| 212 | |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 213 | rq->extra_len = 0; |
| 214 | rq->sense_len = 0; |
| 215 | rq->resid_len = 0; |
| 216 | rq->sense = NULL; |
| 217 | |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 218 | INIT_LIST_HEAD(&rq->timeout_list); |
Jens Axboe | f6be4fb | 2014-06-06 11:03:48 -0600 | [diff] [blame] | 219 | rq->timeout = 0; |
| 220 | |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 221 | rq->end_io = NULL; |
| 222 | rq->end_io_data = NULL; |
| 223 | rq->next_rq = NULL; |
| 224 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 225 | ctx->rq_dispatched[rw_is_sync(rw_flags)]++; |
| 226 | } |
| 227 | |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 228 | static struct request * |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 229 | __blk_mq_alloc_request(struct blk_mq_alloc_data *data, int rw) |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 230 | { |
| 231 | struct request *rq; |
| 232 | unsigned int tag; |
| 233 | |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 234 | tag = blk_mq_get_tag(data); |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 235 | if (tag != BLK_MQ_TAG_FAIL) { |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 236 | rq = data->hctx->tags->rqs[tag]; |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 237 | |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 238 | if (blk_mq_tag_busy(data->hctx)) { |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 239 | rq->cmd_flags = REQ_MQ_INFLIGHT; |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 240 | atomic_inc(&data->hctx->nr_active); |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 241 | } |
| 242 | |
| 243 | rq->tag = tag; |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 244 | blk_mq_rq_ctx_init(data->q, data->ctx, rq, rw); |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 245 | return rq; |
| 246 | } |
| 247 | |
| 248 | return NULL; |
| 249 | } |
| 250 | |
Christoph Hellwig | 4ce01dd | 2014-05-27 20:59:46 +0200 | [diff] [blame] | 251 | struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp, |
| 252 | bool reserved) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 253 | { |
Christoph Hellwig | d852564 | 2014-05-27 20:59:50 +0200 | [diff] [blame] | 254 | struct blk_mq_ctx *ctx; |
| 255 | struct blk_mq_hw_ctx *hctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 256 | struct request *rq; |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 257 | struct blk_mq_alloc_data alloc_data; |
Joe Lawrence | a492f07 | 2014-08-28 08:15:21 -0600 | [diff] [blame] | 258 | int ret; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 259 | |
Joe Lawrence | a492f07 | 2014-08-28 08:15:21 -0600 | [diff] [blame] | 260 | ret = blk_mq_queue_enter(q); |
| 261 | if (ret) |
| 262 | return ERR_PTR(ret); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 263 | |
Christoph Hellwig | d852564 | 2014-05-27 20:59:50 +0200 | [diff] [blame] | 264 | ctx = blk_mq_get_ctx(q); |
| 265 | hctx = q->mq_ops->map_queue(q, ctx->cpu); |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 266 | blk_mq_set_alloc_data(&alloc_data, q, gfp & ~__GFP_WAIT, |
| 267 | reserved, ctx, hctx); |
Christoph Hellwig | d852564 | 2014-05-27 20:59:50 +0200 | [diff] [blame] | 268 | |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 269 | rq = __blk_mq_alloc_request(&alloc_data, rw); |
Christoph Hellwig | d852564 | 2014-05-27 20:59:50 +0200 | [diff] [blame] | 270 | if (!rq && (gfp & __GFP_WAIT)) { |
| 271 | __blk_mq_run_hw_queue(hctx); |
| 272 | blk_mq_put_ctx(ctx); |
| 273 | |
| 274 | ctx = blk_mq_get_ctx(q); |
| 275 | hctx = q->mq_ops->map_queue(q, ctx->cpu); |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 276 | blk_mq_set_alloc_data(&alloc_data, q, gfp, reserved, ctx, |
| 277 | hctx); |
| 278 | rq = __blk_mq_alloc_request(&alloc_data, rw); |
| 279 | ctx = alloc_data.ctx; |
Christoph Hellwig | d852564 | 2014-05-27 20:59:50 +0200 | [diff] [blame] | 280 | } |
| 281 | blk_mq_put_ctx(ctx); |
Keith Busch | c76541a | 2014-12-19 17:54:13 -0700 | [diff] [blame] | 282 | if (!rq) { |
| 283 | blk_mq_queue_exit(q); |
Joe Lawrence | a492f07 | 2014-08-28 08:15:21 -0600 | [diff] [blame] | 284 | return ERR_PTR(-EWOULDBLOCK); |
Keith Busch | c76541a | 2014-12-19 17:54:13 -0700 | [diff] [blame] | 285 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 286 | return rq; |
| 287 | } |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 288 | EXPORT_SYMBOL(blk_mq_alloc_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 289 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 290 | static void __blk_mq_free_request(struct blk_mq_hw_ctx *hctx, |
| 291 | struct blk_mq_ctx *ctx, struct request *rq) |
| 292 | { |
| 293 | const int tag = rq->tag; |
| 294 | struct request_queue *q = rq->q; |
| 295 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 296 | if (rq->cmd_flags & REQ_MQ_INFLIGHT) |
| 297 | atomic_dec(&hctx->nr_active); |
David Hildenbrand | 683d0e1 | 2014-09-18 11:04:31 +0200 | [diff] [blame] | 298 | rq->cmd_flags = 0; |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 299 | |
Christoph Hellwig | af76e55 | 2014-05-06 12:12:45 +0200 | [diff] [blame] | 300 | clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags); |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 301 | blk_mq_put_tag(hctx, tag, &ctx->last_tag); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 302 | blk_mq_queue_exit(q); |
| 303 | } |
| 304 | |
Jens Axboe | 7c7f2f2 | 2014-11-17 10:41:57 -0700 | [diff] [blame] | 305 | 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] | 306 | { |
| 307 | struct blk_mq_ctx *ctx = rq->mq_ctx; |
Jens Axboe | 7c7f2f2 | 2014-11-17 10:41:57 -0700 | [diff] [blame] | 308 | |
| 309 | ctx->rq_completed[rq_is_sync(rq)]++; |
| 310 | __blk_mq_free_request(hctx, ctx, rq); |
| 311 | |
| 312 | } |
| 313 | EXPORT_SYMBOL_GPL(blk_mq_free_hctx_request); |
| 314 | |
| 315 | void blk_mq_free_request(struct request *rq) |
| 316 | { |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 317 | struct blk_mq_hw_ctx *hctx; |
| 318 | struct request_queue *q = rq->q; |
| 319 | |
Jens Axboe | 7c7f2f2 | 2014-11-17 10:41:57 -0700 | [diff] [blame] | 320 | hctx = q->mq_ops->map_queue(q, rq->mq_ctx->cpu); |
| 321 | blk_mq_free_hctx_request(hctx, rq); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 322 | } |
Jens Axboe | 1a3b595 | 2014-11-17 10:40:48 -0700 | [diff] [blame] | 323 | EXPORT_SYMBOL_GPL(blk_mq_free_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 324 | |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 325 | inline void __blk_mq_end_request(struct request *rq, int error) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 326 | { |
Ming Lei | 0d11e6a | 2013-12-05 10:50:39 -0700 | [diff] [blame] | 327 | blk_account_io_done(rq); |
| 328 | |
Christoph Hellwig | 91b6363 | 2014-04-16 09:44:53 +0200 | [diff] [blame] | 329 | if (rq->end_io) { |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 330 | rq->end_io(rq, error); |
Christoph Hellwig | 91b6363 | 2014-04-16 09:44:53 +0200 | [diff] [blame] | 331 | } else { |
| 332 | if (unlikely(blk_bidi_rq(rq))) |
| 333 | blk_mq_free_request(rq->next_rq); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 334 | blk_mq_free_request(rq); |
Christoph Hellwig | 91b6363 | 2014-04-16 09:44:53 +0200 | [diff] [blame] | 335 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 336 | } |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 337 | EXPORT_SYMBOL(__blk_mq_end_request); |
Christoph Hellwig | 63151a4 | 2014-04-16 09:44:52 +0200 | [diff] [blame] | 338 | |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 339 | void blk_mq_end_request(struct request *rq, int error) |
Christoph Hellwig | 63151a4 | 2014-04-16 09:44:52 +0200 | [diff] [blame] | 340 | { |
| 341 | if (blk_update_request(rq, error, blk_rq_bytes(rq))) |
| 342 | BUG(); |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 343 | __blk_mq_end_request(rq, error); |
Christoph Hellwig | 63151a4 | 2014-04-16 09:44:52 +0200 | [diff] [blame] | 344 | } |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 345 | EXPORT_SYMBOL(blk_mq_end_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 346 | |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 347 | static void __blk_mq_complete_request_remote(void *data) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 348 | { |
Christoph Hellwig | 3d6efbf | 2014-01-08 09:33:37 -0800 | [diff] [blame] | 349 | struct request *rq = data; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 350 | |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 351 | rq->q->softirq_done_fn(rq); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 352 | } |
| 353 | |
Jens Axboe | ed85186 | 2014-05-30 21:20:50 -0600 | [diff] [blame] | 354 | static void blk_mq_ipi_complete_request(struct request *rq) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 355 | { |
| 356 | struct blk_mq_ctx *ctx = rq->mq_ctx; |
Christoph Hellwig | 3853520 | 2014-04-25 02:32:53 -0700 | [diff] [blame] | 357 | bool shared = false; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 358 | int cpu; |
| 359 | |
Christoph Hellwig | 3853520 | 2014-04-25 02:32:53 -0700 | [diff] [blame] | 360 | if (!test_bit(QUEUE_FLAG_SAME_COMP, &rq->q->queue_flags)) { |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 361 | rq->q->softirq_done_fn(rq); |
| 362 | return; |
| 363 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 364 | |
| 365 | cpu = get_cpu(); |
Christoph Hellwig | 3853520 | 2014-04-25 02:32:53 -0700 | [diff] [blame] | 366 | if (!test_bit(QUEUE_FLAG_SAME_FORCE, &rq->q->queue_flags)) |
| 367 | shared = cpus_share_cache(cpu, ctx->cpu); |
| 368 | |
| 369 | if (cpu != ctx->cpu && !shared && cpu_online(ctx->cpu)) { |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 370 | rq->csd.func = __blk_mq_complete_request_remote; |
Christoph Hellwig | 3d6efbf | 2014-01-08 09:33:37 -0800 | [diff] [blame] | 371 | rq->csd.info = rq; |
| 372 | rq->csd.flags = 0; |
Frederic Weisbecker | c46fff2 | 2014-02-24 16:40:02 +0100 | [diff] [blame] | 373 | smp_call_function_single_async(ctx->cpu, &rq->csd); |
Christoph Hellwig | 3d6efbf | 2014-01-08 09:33:37 -0800 | [diff] [blame] | 374 | } else { |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 375 | rq->q->softirq_done_fn(rq); |
Christoph Hellwig | 3d6efbf | 2014-01-08 09:33:37 -0800 | [diff] [blame] | 376 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 377 | put_cpu(); |
| 378 | } |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 379 | |
Jens Axboe | ed85186 | 2014-05-30 21:20:50 -0600 | [diff] [blame] | 380 | void __blk_mq_complete_request(struct request *rq) |
| 381 | { |
| 382 | struct request_queue *q = rq->q; |
| 383 | |
| 384 | if (!q->softirq_done_fn) |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 385 | blk_mq_end_request(rq, rq->errors); |
Jens Axboe | ed85186 | 2014-05-30 21:20:50 -0600 | [diff] [blame] | 386 | else |
| 387 | blk_mq_ipi_complete_request(rq); |
| 388 | } |
| 389 | |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 390 | /** |
| 391 | * blk_mq_complete_request - end I/O on a request |
| 392 | * @rq: the request being processed |
| 393 | * |
| 394 | * Description: |
| 395 | * Ends all I/O on a request. It does not handle partial completions. |
| 396 | * The actual completion happens out-of-order, through a IPI handler. |
| 397 | **/ |
| 398 | void blk_mq_complete_request(struct request *rq) |
| 399 | { |
Jens Axboe | 95f0968 | 2014-05-27 17:46:48 -0600 | [diff] [blame] | 400 | struct request_queue *q = rq->q; |
| 401 | |
| 402 | if (unlikely(blk_should_fake_timeout(q))) |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 403 | return; |
Jens Axboe | ed85186 | 2014-05-30 21:20:50 -0600 | [diff] [blame] | 404 | if (!blk_mark_rq_complete(rq)) |
| 405 | __blk_mq_complete_request(rq); |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 406 | } |
| 407 | EXPORT_SYMBOL(blk_mq_complete_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 408 | |
Keith Busch | 973c019 | 2015-01-07 18:55:43 -0700 | [diff] [blame] | 409 | int blk_mq_request_started(struct request *rq) |
| 410 | { |
| 411 | return test_bit(REQ_ATOM_STARTED, &rq->atomic_flags); |
| 412 | } |
| 413 | EXPORT_SYMBOL_GPL(blk_mq_request_started); |
| 414 | |
Christoph Hellwig | e249007 | 2014-09-13 16:40:09 -0700 | [diff] [blame] | 415 | void blk_mq_start_request(struct request *rq) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 416 | { |
| 417 | struct request_queue *q = rq->q; |
| 418 | |
| 419 | trace_block_rq_issue(q, rq); |
| 420 | |
Christoph Hellwig | 742ee69 | 2014-04-14 10:30:06 +0200 | [diff] [blame] | 421 | rq->resid_len = blk_rq_bytes(rq); |
Christoph Hellwig | 91b6363 | 2014-04-16 09:44:53 +0200 | [diff] [blame] | 422 | if (unlikely(blk_bidi_rq(rq))) |
| 423 | rq->next_rq->resid_len = blk_rq_bytes(rq->next_rq); |
Christoph Hellwig | 742ee69 | 2014-04-14 10:30:06 +0200 | [diff] [blame] | 424 | |
Ming Lei | 2b8393b | 2014-06-10 00:16:41 +0800 | [diff] [blame] | 425 | blk_add_timer(rq); |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 426 | |
| 427 | /* |
Jens Axboe | 538b753 | 2014-09-16 10:37:37 -0600 | [diff] [blame] | 428 | * Ensure that ->deadline is visible before set the started |
| 429 | * flag and clear the completed flag. |
| 430 | */ |
| 431 | smp_mb__before_atomic(); |
| 432 | |
| 433 | /* |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 434 | * Mark us as started and clear complete. Complete might have been |
| 435 | * set if requeue raced with timeout, which then marked it as |
| 436 | * complete. So be sure to clear complete again when we start |
| 437 | * the request, otherwise we'll ignore the completion event. |
| 438 | */ |
Jens Axboe | 4b57052 | 2014-05-29 11:00:11 -0600 | [diff] [blame] | 439 | if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) |
| 440 | set_bit(REQ_ATOM_STARTED, &rq->atomic_flags); |
| 441 | if (test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) |
| 442 | clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); |
Christoph Hellwig | 49f5baa | 2014-02-11 08:27:14 -0800 | [diff] [blame] | 443 | |
| 444 | if (q->dma_drain_size && blk_rq_bytes(rq)) { |
| 445 | /* |
| 446 | * Make sure space for the drain appears. We know we can do |
| 447 | * this because max_hw_segments has been adjusted to be one |
| 448 | * fewer than the device can handle. |
| 449 | */ |
| 450 | rq->nr_phys_segments++; |
| 451 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 452 | } |
Christoph Hellwig | e249007 | 2014-09-13 16:40:09 -0700 | [diff] [blame] | 453 | EXPORT_SYMBOL(blk_mq_start_request); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 454 | |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 455 | static void __blk_mq_requeue_request(struct request *rq) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 456 | { |
| 457 | struct request_queue *q = rq->q; |
| 458 | |
| 459 | trace_block_rq_requeue(q, rq); |
Christoph Hellwig | 49f5baa | 2014-02-11 08:27:14 -0800 | [diff] [blame] | 460 | |
Christoph Hellwig | e249007 | 2014-09-13 16:40:09 -0700 | [diff] [blame] | 461 | if (test_and_clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) { |
| 462 | if (q->dma_drain_size && blk_rq_bytes(rq)) |
| 463 | rq->nr_phys_segments--; |
| 464 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 465 | } |
| 466 | |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 467 | void blk_mq_requeue_request(struct request *rq) |
| 468 | { |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 469 | __blk_mq_requeue_request(rq); |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 470 | |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 471 | BUG_ON(blk_queued_rq(rq)); |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 472 | blk_mq_add_to_requeue_list(rq, true); |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 473 | } |
| 474 | EXPORT_SYMBOL(blk_mq_requeue_request); |
| 475 | |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 476 | static void blk_mq_requeue_work(struct work_struct *work) |
| 477 | { |
| 478 | struct request_queue *q = |
| 479 | container_of(work, struct request_queue, requeue_work); |
| 480 | LIST_HEAD(rq_list); |
| 481 | struct request *rq, *next; |
| 482 | unsigned long flags; |
| 483 | |
| 484 | spin_lock_irqsave(&q->requeue_lock, flags); |
| 485 | list_splice_init(&q->requeue_list, &rq_list); |
| 486 | spin_unlock_irqrestore(&q->requeue_lock, flags); |
| 487 | |
| 488 | list_for_each_entry_safe(rq, next, &rq_list, queuelist) { |
| 489 | if (!(rq->cmd_flags & REQ_SOFTBARRIER)) |
| 490 | continue; |
| 491 | |
| 492 | rq->cmd_flags &= ~REQ_SOFTBARRIER; |
| 493 | list_del_init(&rq->queuelist); |
| 494 | blk_mq_insert_request(rq, true, false, false); |
| 495 | } |
| 496 | |
| 497 | while (!list_empty(&rq_list)) { |
| 498 | rq = list_entry(rq_list.next, struct request, queuelist); |
| 499 | list_del_init(&rq->queuelist); |
| 500 | blk_mq_insert_request(rq, false, false, false); |
| 501 | } |
| 502 | |
Jens Axboe | 8b95741 | 2014-09-19 13:10:29 -0600 | [diff] [blame] | 503 | /* |
| 504 | * Use the start variant of queue running here, so that running |
| 505 | * the requeue work will kick stopped queues. |
| 506 | */ |
| 507 | blk_mq_start_hw_queues(q); |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 508 | } |
| 509 | |
| 510 | void blk_mq_add_to_requeue_list(struct request *rq, bool at_head) |
| 511 | { |
| 512 | struct request_queue *q = rq->q; |
| 513 | unsigned long flags; |
| 514 | |
| 515 | /* |
| 516 | * We abuse this flag that is otherwise used by the I/O scheduler to |
| 517 | * request head insertation from the workqueue. |
| 518 | */ |
| 519 | BUG_ON(rq->cmd_flags & REQ_SOFTBARRIER); |
| 520 | |
| 521 | spin_lock_irqsave(&q->requeue_lock, flags); |
| 522 | if (at_head) { |
| 523 | rq->cmd_flags |= REQ_SOFTBARRIER; |
| 524 | list_add(&rq->queuelist, &q->requeue_list); |
| 525 | } else { |
| 526 | list_add_tail(&rq->queuelist, &q->requeue_list); |
| 527 | } |
| 528 | spin_unlock_irqrestore(&q->requeue_lock, flags); |
| 529 | } |
| 530 | EXPORT_SYMBOL(blk_mq_add_to_requeue_list); |
| 531 | |
Keith Busch | c68ed59 | 2015-01-07 18:55:44 -0700 | [diff] [blame] | 532 | void blk_mq_cancel_requeue_work(struct request_queue *q) |
| 533 | { |
| 534 | cancel_work_sync(&q->requeue_work); |
| 535 | } |
| 536 | EXPORT_SYMBOL_GPL(blk_mq_cancel_requeue_work); |
| 537 | |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 538 | void blk_mq_kick_requeue_list(struct request_queue *q) |
| 539 | { |
| 540 | kblockd_schedule_work(&q->requeue_work); |
| 541 | } |
| 542 | EXPORT_SYMBOL(blk_mq_kick_requeue_list); |
| 543 | |
Jens Axboe | 1885b24 | 2015-01-07 18:55:45 -0700 | [diff] [blame] | 544 | void blk_mq_abort_requeue_list(struct request_queue *q) |
| 545 | { |
| 546 | unsigned long flags; |
| 547 | LIST_HEAD(rq_list); |
| 548 | |
| 549 | spin_lock_irqsave(&q->requeue_lock, flags); |
| 550 | list_splice_init(&q->requeue_list, &rq_list); |
| 551 | spin_unlock_irqrestore(&q->requeue_lock, flags); |
| 552 | |
| 553 | while (!list_empty(&rq_list)) { |
| 554 | struct request *rq; |
| 555 | |
| 556 | rq = list_first_entry(&rq_list, struct request, queuelist); |
| 557 | list_del_init(&rq->queuelist); |
| 558 | rq->errors = -EIO; |
| 559 | blk_mq_end_request(rq, rq->errors); |
| 560 | } |
| 561 | } |
| 562 | EXPORT_SYMBOL(blk_mq_abort_requeue_list); |
| 563 | |
Ming Lei | 7c94e1c | 2014-09-25 23:23:43 +0800 | [diff] [blame] | 564 | static inline bool is_flush_request(struct request *rq, |
| 565 | struct blk_flush_queue *fq, unsigned int tag) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 566 | { |
Jens Axboe | 0e62f51 | 2014-06-04 10:23:49 -0600 | [diff] [blame] | 567 | return ((rq->cmd_flags & REQ_FLUSH_SEQ) && |
Ming Lei | 7c94e1c | 2014-09-25 23:23:43 +0800 | [diff] [blame] | 568 | fq->flush_rq->tag == tag); |
Jens Axboe | 0e62f51 | 2014-06-04 10:23:49 -0600 | [diff] [blame] | 569 | } |
Shaohua Li | 2230237 | 2014-05-30 08:06:42 -0600 | [diff] [blame] | 570 | |
Jens Axboe | 0e62f51 | 2014-06-04 10:23:49 -0600 | [diff] [blame] | 571 | struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag) |
| 572 | { |
| 573 | struct request *rq = tags->rqs[tag]; |
Ming Lei | e97c293 | 2014-09-25 23:23:46 +0800 | [diff] [blame] | 574 | /* mq_ctx of flush rq is always cloned from the corresponding req */ |
| 575 | struct blk_flush_queue *fq = blk_get_flush_queue(rq->q, rq->mq_ctx); |
Shaohua Li | 2230237 | 2014-05-30 08:06:42 -0600 | [diff] [blame] | 576 | |
Ming Lei | 7c94e1c | 2014-09-25 23:23:43 +0800 | [diff] [blame] | 577 | if (!is_flush_request(rq, fq, tag)) |
Jens Axboe | 0e62f51 | 2014-06-04 10:23:49 -0600 | [diff] [blame] | 578 | return rq; |
| 579 | |
Ming Lei | 7c94e1c | 2014-09-25 23:23:43 +0800 | [diff] [blame] | 580 | return fq->flush_rq; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 581 | } |
| 582 | EXPORT_SYMBOL(blk_mq_tag_to_rq); |
| 583 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 584 | struct blk_mq_timeout_data { |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 585 | unsigned long next; |
| 586 | unsigned int next_set; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 587 | }; |
| 588 | |
Christoph Hellwig | 9041583 | 2014-09-22 10:21:48 -0600 | [diff] [blame] | 589 | void blk_mq_rq_timed_out(struct request *req, bool reserved) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 590 | { |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 591 | struct blk_mq_ops *ops = req->q->mq_ops; |
| 592 | enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER; |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 593 | |
| 594 | /* |
| 595 | * We know that complete is set at this point. If STARTED isn't set |
| 596 | * anymore, then the request isn't active and the "timeout" should |
| 597 | * just be ignored. This can happen due to the bitflag ordering. |
| 598 | * Timeout first checks if STARTED is set, and if it is, assumes |
| 599 | * the request is active. But if we race with completion, then |
| 600 | * we both flags will get cleared. So check here again, and ignore |
| 601 | * a timeout event with a request that isn't active. |
| 602 | */ |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 603 | if (!test_bit(REQ_ATOM_STARTED, &req->atomic_flags)) |
| 604 | return; |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 605 | |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 606 | if (ops->timeout) |
Christoph Hellwig | 0152fb6 | 2014-09-13 16:40:13 -0700 | [diff] [blame] | 607 | ret = ops->timeout(req, reserved); |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 608 | |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 609 | switch (ret) { |
| 610 | case BLK_EH_HANDLED: |
| 611 | __blk_mq_complete_request(req); |
| 612 | break; |
| 613 | case BLK_EH_RESET_TIMER: |
| 614 | blk_add_timer(req); |
| 615 | blk_clear_rq_complete(req); |
| 616 | break; |
| 617 | case BLK_EH_NOT_HANDLED: |
| 618 | break; |
| 619 | default: |
| 620 | printk(KERN_ERR "block: bad eh return: %d\n", ret); |
| 621 | break; |
| 622 | } |
Jens Axboe | 87ee7b1 | 2014-04-24 08:51:47 -0600 | [diff] [blame] | 623 | } |
Keith Busch | 5b3f25f | 2015-01-07 18:55:46 -0700 | [diff] [blame] | 624 | |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 625 | static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx, |
| 626 | struct request *rq, void *priv, bool reserved) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 627 | { |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 628 | struct blk_mq_timeout_data *data = priv; |
| 629 | |
Keith Busch | eb130db | 2015-01-08 08:59:53 -0700 | [diff] [blame] | 630 | if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) { |
| 631 | /* |
| 632 | * If a request wasn't started before the queue was |
| 633 | * marked dying, kill it here or it'll go unnoticed. |
| 634 | */ |
| 635 | if (unlikely(blk_queue_dying(rq->q))) { |
| 636 | rq->errors = -EIO; |
| 637 | blk_mq_complete_request(rq); |
| 638 | } |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 639 | return; |
Keith Busch | eb130db | 2015-01-08 08:59:53 -0700 | [diff] [blame] | 640 | } |
Keith Busch | 5b3f25f | 2015-01-07 18:55:46 -0700 | [diff] [blame] | 641 | if (rq->cmd_flags & REQ_NO_TIMEOUT) |
| 642 | return; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 643 | |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 644 | if (time_after_eq(jiffies, rq->deadline)) { |
| 645 | if (!blk_mark_rq_complete(rq)) |
Christoph Hellwig | 0152fb6 | 2014-09-13 16:40:13 -0700 | [diff] [blame] | 646 | blk_mq_rq_timed_out(rq, reserved); |
Christoph Hellwig | 46f92d4 | 2014-09-13 16:40:12 -0700 | [diff] [blame] | 647 | } else if (!data->next_set || time_after(data->next, rq->deadline)) { |
| 648 | data->next = rq->deadline; |
| 649 | data->next_set = 1; |
| 650 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 651 | } |
| 652 | |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 653 | static void blk_mq_rq_timer(unsigned long priv) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 654 | { |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 655 | struct request_queue *q = (struct request_queue *)priv; |
| 656 | struct blk_mq_timeout_data data = { |
| 657 | .next = 0, |
| 658 | .next_set = 0, |
| 659 | }; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 660 | struct blk_mq_hw_ctx *hctx; |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 661 | int i; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 662 | |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 663 | queue_for_each_hw_ctx(q, hctx, i) { |
| 664 | /* |
| 665 | * If not software queues are currently mapped to this |
| 666 | * hardware queue, there's nothing to check |
| 667 | */ |
Ming Lei | 19c66e5 | 2014-12-03 19:38:04 +0800 | [diff] [blame] | 668 | if (!blk_mq_hw_queue_mapped(hctx)) |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 669 | continue; |
| 670 | |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 671 | blk_mq_tag_busy_iter(hctx, blk_mq_check_expired, &data); |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 672 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 673 | |
Christoph Hellwig | 81481eb | 2014-09-13 16:40:11 -0700 | [diff] [blame] | 674 | if (data.next_set) { |
| 675 | data.next = blk_rq_timeout(round_jiffies_up(data.next)); |
| 676 | mod_timer(&q->timeout, data.next); |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 677 | } else { |
| 678 | queue_for_each_hw_ctx(q, hctx, i) |
| 679 | blk_mq_tag_idle(hctx); |
| 680 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 681 | } |
| 682 | |
| 683 | /* |
| 684 | * Reverse check our software queue for entries that we could potentially |
| 685 | * merge with. Currently includes a hand-wavy stop count of 8, to not spend |
| 686 | * too much time checking for merges. |
| 687 | */ |
| 688 | static bool blk_mq_attempt_merge(struct request_queue *q, |
| 689 | struct blk_mq_ctx *ctx, struct bio *bio) |
| 690 | { |
| 691 | struct request *rq; |
| 692 | int checked = 8; |
| 693 | |
| 694 | list_for_each_entry_reverse(rq, &ctx->rq_list, queuelist) { |
| 695 | int el_ret; |
| 696 | |
| 697 | if (!checked--) |
| 698 | break; |
| 699 | |
| 700 | if (!blk_rq_merge_ok(rq, bio)) |
| 701 | continue; |
| 702 | |
| 703 | el_ret = blk_try_merge(rq, bio); |
| 704 | if (el_ret == ELEVATOR_BACK_MERGE) { |
| 705 | if (bio_attempt_back_merge(q, rq, bio)) { |
| 706 | ctx->rq_merged++; |
| 707 | return true; |
| 708 | } |
| 709 | break; |
| 710 | } else if (el_ret == ELEVATOR_FRONT_MERGE) { |
| 711 | if (bio_attempt_front_merge(q, rq, bio)) { |
| 712 | ctx->rq_merged++; |
| 713 | return true; |
| 714 | } |
| 715 | break; |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | return false; |
| 720 | } |
| 721 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 722 | /* |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 723 | * Process software queues that have been marked busy, splicing them |
| 724 | * to the for-dispatch |
| 725 | */ |
| 726 | static void flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list) |
| 727 | { |
| 728 | struct blk_mq_ctx *ctx; |
| 729 | int i; |
| 730 | |
| 731 | for (i = 0; i < hctx->ctx_map.map_size; i++) { |
| 732 | struct blk_align_bitmap *bm = &hctx->ctx_map.map[i]; |
| 733 | unsigned int off, bit; |
| 734 | |
| 735 | if (!bm->word) |
| 736 | continue; |
| 737 | |
| 738 | bit = 0; |
| 739 | off = i * hctx->ctx_map.bits_per_word; |
| 740 | do { |
| 741 | bit = find_next_bit(&bm->word, bm->depth, bit); |
| 742 | if (bit >= bm->depth) |
| 743 | break; |
| 744 | |
| 745 | ctx = hctx->ctxs[bit + off]; |
| 746 | clear_bit(bit, &bm->word); |
| 747 | spin_lock(&ctx->lock); |
| 748 | list_splice_tail_init(&ctx->rq_list, list); |
| 749 | spin_unlock(&ctx->lock); |
| 750 | |
| 751 | bit++; |
| 752 | } while (1); |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | /* |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 757 | * Run this hardware queue, pulling any software queues mapped to it in. |
| 758 | * Note that this function currently has various problems around ordering |
| 759 | * of IO. In particular, we'd like FIFO behaviour on handling existing |
| 760 | * items on the hctx->dispatch list. Ignore that for now. |
| 761 | */ |
| 762 | static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx) |
| 763 | { |
| 764 | struct request_queue *q = hctx->queue; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 765 | struct request *rq; |
| 766 | LIST_HEAD(rq_list); |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 767 | LIST_HEAD(driver_list); |
| 768 | struct list_head *dptr; |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 769 | int queued; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 770 | |
Jens Axboe | fd1270d | 2014-04-16 09:23:48 -0600 | [diff] [blame] | 771 | WARN_ON(!cpumask_test_cpu(raw_smp_processor_id(), hctx->cpumask)); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 772 | |
Jens Axboe | 5d12f90 | 2014-03-19 15:25:02 -0600 | [diff] [blame] | 773 | if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->state))) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 774 | return; |
| 775 | |
| 776 | hctx->run++; |
| 777 | |
| 778 | /* |
| 779 | * Touch any software queue that has pending entries. |
| 780 | */ |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 781 | flush_busy_ctxs(hctx, &rq_list); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 782 | |
| 783 | /* |
| 784 | * If we have previous entries on our dispatch list, grab them |
| 785 | * and stuff them at the front for more fair dispatch. |
| 786 | */ |
| 787 | if (!list_empty_careful(&hctx->dispatch)) { |
| 788 | spin_lock(&hctx->lock); |
| 789 | if (!list_empty(&hctx->dispatch)) |
| 790 | list_splice_init(&hctx->dispatch, &rq_list); |
| 791 | spin_unlock(&hctx->lock); |
| 792 | } |
| 793 | |
| 794 | /* |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 795 | * Start off with dptr being NULL, so we start the first request |
| 796 | * immediately, even if we have more pending. |
| 797 | */ |
| 798 | dptr = NULL; |
| 799 | |
| 800 | /* |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 801 | * Now process all the entries, sending them to the driver. |
| 802 | */ |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 803 | queued = 0; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 804 | while (!list_empty(&rq_list)) { |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 805 | struct blk_mq_queue_data bd; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 806 | int ret; |
| 807 | |
| 808 | rq = list_first_entry(&rq_list, struct request, queuelist); |
| 809 | list_del_init(&rq->queuelist); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 810 | |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 811 | bd.rq = rq; |
| 812 | bd.list = dptr; |
| 813 | bd.last = list_empty(&rq_list); |
| 814 | |
| 815 | ret = q->mq_ops->queue_rq(hctx, &bd); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 816 | switch (ret) { |
| 817 | case BLK_MQ_RQ_QUEUE_OK: |
| 818 | queued++; |
| 819 | continue; |
| 820 | case BLK_MQ_RQ_QUEUE_BUSY: |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 821 | list_add(&rq->queuelist, &rq_list); |
Christoph Hellwig | ed0791b | 2014-04-16 09:44:57 +0200 | [diff] [blame] | 822 | __blk_mq_requeue_request(rq); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 823 | break; |
| 824 | default: |
| 825 | pr_err("blk-mq: bad return on queue: %d\n", ret); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 826 | case BLK_MQ_RQ_QUEUE_ERROR: |
Christoph Hellwig | 1e93b8c | 2014-02-11 08:27:13 -0800 | [diff] [blame] | 827 | rq->errors = -EIO; |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 828 | blk_mq_end_request(rq, rq->errors); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 829 | break; |
| 830 | } |
| 831 | |
| 832 | if (ret == BLK_MQ_RQ_QUEUE_BUSY) |
| 833 | break; |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 834 | |
| 835 | /* |
| 836 | * We've done the first request. If we have more than 1 |
| 837 | * left in the list, set dptr to defer issue. |
| 838 | */ |
| 839 | if (!dptr && rq_list.next != rq_list.prev) |
| 840 | dptr = &driver_list; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 841 | } |
| 842 | |
| 843 | if (!queued) |
| 844 | hctx->dispatched[0]++; |
| 845 | else if (queued < (1 << (BLK_MQ_MAX_DISPATCH_ORDER - 1))) |
| 846 | hctx->dispatched[ilog2(queued) + 1]++; |
| 847 | |
| 848 | /* |
| 849 | * Any items that need requeuing? Stuff them into hctx->dispatch, |
| 850 | * that is where we will continue on next queue run. |
| 851 | */ |
| 852 | if (!list_empty(&rq_list)) { |
| 853 | spin_lock(&hctx->lock); |
| 854 | list_splice(&rq_list, &hctx->dispatch); |
| 855 | spin_unlock(&hctx->lock); |
| 856 | } |
| 857 | } |
| 858 | |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 859 | /* |
| 860 | * It'd be great if the workqueue API had a way to pass |
| 861 | * in a mask and had some smarts for more clever placement. |
| 862 | * For now we just round-robin here, switching for every |
| 863 | * BLK_MQ_CPU_WORK_BATCH queued items. |
| 864 | */ |
| 865 | static int blk_mq_hctx_next_cpu(struct blk_mq_hw_ctx *hctx) |
| 866 | { |
Christoph Hellwig | b657d7e | 2014-11-24 09:27:23 +0100 | [diff] [blame] | 867 | if (hctx->queue->nr_hw_queues == 1) |
| 868 | return WORK_CPU_UNBOUND; |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 869 | |
| 870 | if (--hctx->next_cpu_batch <= 0) { |
Christoph Hellwig | b657d7e | 2014-11-24 09:27:23 +0100 | [diff] [blame] | 871 | int cpu = hctx->next_cpu, next_cpu; |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 872 | |
| 873 | next_cpu = cpumask_next(hctx->next_cpu, hctx->cpumask); |
| 874 | if (next_cpu >= nr_cpu_ids) |
| 875 | next_cpu = cpumask_first(hctx->cpumask); |
| 876 | |
| 877 | hctx->next_cpu = next_cpu; |
| 878 | hctx->next_cpu_batch = BLK_MQ_CPU_WORK_BATCH; |
Christoph Hellwig | b657d7e | 2014-11-24 09:27:23 +0100 | [diff] [blame] | 879 | |
| 880 | return cpu; |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 881 | } |
| 882 | |
Christoph Hellwig | b657d7e | 2014-11-24 09:27:23 +0100 | [diff] [blame] | 883 | return hctx->next_cpu; |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 884 | } |
| 885 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 886 | void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) |
| 887 | { |
Ming Lei | 19c66e5 | 2014-12-03 19:38:04 +0800 | [diff] [blame] | 888 | if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->state) || |
| 889 | !blk_mq_hw_queue_mapped(hctx))) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 890 | return; |
| 891 | |
Paolo Bonzini | 398205b | 2014-11-07 23:03:59 +0100 | [diff] [blame] | 892 | if (!async) { |
Paolo Bonzini | 2a90d4a | 2014-11-07 23:04:00 +0100 | [diff] [blame] | 893 | int cpu = get_cpu(); |
| 894 | if (cpumask_test_cpu(cpu, hctx->cpumask)) { |
Paolo Bonzini | 398205b | 2014-11-07 23:03:59 +0100 | [diff] [blame] | 895 | __blk_mq_run_hw_queue(hctx); |
Paolo Bonzini | 2a90d4a | 2014-11-07 23:04:00 +0100 | [diff] [blame] | 896 | put_cpu(); |
Paolo Bonzini | 398205b | 2014-11-07 23:03:59 +0100 | [diff] [blame] | 897 | return; |
| 898 | } |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 899 | |
Paolo Bonzini | 2a90d4a | 2014-11-07 23:04:00 +0100 | [diff] [blame] | 900 | put_cpu(); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 901 | } |
Paolo Bonzini | 398205b | 2014-11-07 23:03:59 +0100 | [diff] [blame] | 902 | |
Christoph Hellwig | b657d7e | 2014-11-24 09:27:23 +0100 | [diff] [blame] | 903 | kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx), |
| 904 | &hctx->run_work, 0); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 905 | } |
| 906 | |
Jens Axboe | 201f201 | 2015-02-10 13:31:34 -0700 | [diff] [blame] | 907 | static void blk_mq_run_queues(struct request_queue *q) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 908 | { |
| 909 | struct blk_mq_hw_ctx *hctx; |
| 910 | int i; |
| 911 | |
| 912 | queue_for_each_hw_ctx(q, hctx, i) { |
| 913 | if ((!blk_mq_hctx_has_pending(hctx) && |
| 914 | list_empty_careful(&hctx->dispatch)) || |
Jens Axboe | 5d12f90 | 2014-03-19 15:25:02 -0600 | [diff] [blame] | 915 | test_bit(BLK_MQ_S_STOPPED, &hctx->state)) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 916 | continue; |
| 917 | |
Jens Axboe | 201f201 | 2015-02-10 13:31:34 -0700 | [diff] [blame] | 918 | blk_mq_run_hw_queue(hctx, false); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 919 | } |
| 920 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 921 | |
| 922 | void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx) |
| 923 | { |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 924 | cancel_delayed_work(&hctx->run_work); |
| 925 | cancel_delayed_work(&hctx->delay_work); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 926 | set_bit(BLK_MQ_S_STOPPED, &hctx->state); |
| 927 | } |
| 928 | EXPORT_SYMBOL(blk_mq_stop_hw_queue); |
| 929 | |
Christoph Hellwig | 280d45f | 2013-10-25 14:45:58 +0100 | [diff] [blame] | 930 | void blk_mq_stop_hw_queues(struct request_queue *q) |
| 931 | { |
| 932 | struct blk_mq_hw_ctx *hctx; |
| 933 | int i; |
| 934 | |
| 935 | queue_for_each_hw_ctx(q, hctx, i) |
| 936 | blk_mq_stop_hw_queue(hctx); |
| 937 | } |
| 938 | EXPORT_SYMBOL(blk_mq_stop_hw_queues); |
| 939 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 940 | void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx) |
| 941 | { |
| 942 | clear_bit(BLK_MQ_S_STOPPED, &hctx->state); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 943 | |
Jens Axboe | 0ffbce8 | 2014-06-25 08:22:34 -0600 | [diff] [blame] | 944 | blk_mq_run_hw_queue(hctx, false); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 945 | } |
| 946 | EXPORT_SYMBOL(blk_mq_start_hw_queue); |
| 947 | |
Christoph Hellwig | 2f26855 | 2014-04-16 09:44:56 +0200 | [diff] [blame] | 948 | void blk_mq_start_hw_queues(struct request_queue *q) |
| 949 | { |
| 950 | struct blk_mq_hw_ctx *hctx; |
| 951 | int i; |
| 952 | |
| 953 | queue_for_each_hw_ctx(q, hctx, i) |
| 954 | blk_mq_start_hw_queue(hctx); |
| 955 | } |
| 956 | EXPORT_SYMBOL(blk_mq_start_hw_queues); |
| 957 | |
Christoph Hellwig | 1b4a325 | 2014-04-16 09:44:54 +0200 | [diff] [blame] | 958 | 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] | 959 | { |
| 960 | struct blk_mq_hw_ctx *hctx; |
| 961 | int i; |
| 962 | |
| 963 | queue_for_each_hw_ctx(q, hctx, i) { |
| 964 | if (!test_bit(BLK_MQ_S_STOPPED, &hctx->state)) |
| 965 | continue; |
| 966 | |
| 967 | clear_bit(BLK_MQ_S_STOPPED, &hctx->state); |
Christoph Hellwig | 1b4a325 | 2014-04-16 09:44:54 +0200 | [diff] [blame] | 968 | blk_mq_run_hw_queue(hctx, async); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 969 | } |
| 970 | } |
| 971 | EXPORT_SYMBOL(blk_mq_start_stopped_hw_queues); |
| 972 | |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 973 | static void blk_mq_run_work_fn(struct work_struct *work) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 974 | { |
| 975 | struct blk_mq_hw_ctx *hctx; |
| 976 | |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 977 | hctx = container_of(work, struct blk_mq_hw_ctx, run_work.work); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 978 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 979 | __blk_mq_run_hw_queue(hctx); |
| 980 | } |
| 981 | |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 982 | static void blk_mq_delay_work_fn(struct work_struct *work) |
| 983 | { |
| 984 | struct blk_mq_hw_ctx *hctx; |
| 985 | |
| 986 | hctx = container_of(work, struct blk_mq_hw_ctx, delay_work.work); |
| 987 | |
| 988 | if (test_and_clear_bit(BLK_MQ_S_STOPPED, &hctx->state)) |
| 989 | __blk_mq_run_hw_queue(hctx); |
| 990 | } |
| 991 | |
| 992 | void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs) |
| 993 | { |
Ming Lei | 19c66e5 | 2014-12-03 19:38:04 +0800 | [diff] [blame] | 994 | if (unlikely(!blk_mq_hw_queue_mapped(hctx))) |
| 995 | return; |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 996 | |
Christoph Hellwig | b657d7e | 2014-11-24 09:27:23 +0100 | [diff] [blame] | 997 | kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx), |
| 998 | &hctx->delay_work, msecs_to_jiffies(msecs)); |
Christoph Hellwig | 70f4db6 | 2014-04-16 10:48:08 -0600 | [diff] [blame] | 999 | } |
| 1000 | EXPORT_SYMBOL(blk_mq_delay_queue); |
| 1001 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1002 | static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, |
Christoph Hellwig | 72a0a36 | 2014-02-07 10:22:36 -0800 | [diff] [blame] | 1003 | struct request *rq, bool at_head) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1004 | { |
| 1005 | struct blk_mq_ctx *ctx = rq->mq_ctx; |
| 1006 | |
Jens Axboe | 01b983c | 2013-11-19 18:59:10 -0700 | [diff] [blame] | 1007 | trace_block_rq_insert(hctx->queue, rq); |
| 1008 | |
Christoph Hellwig | 72a0a36 | 2014-02-07 10:22:36 -0800 | [diff] [blame] | 1009 | if (at_head) |
| 1010 | list_add(&rq->queuelist, &ctx->rq_list); |
| 1011 | else |
| 1012 | list_add_tail(&rq->queuelist, &ctx->rq_list); |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 1013 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1014 | blk_mq_hctx_mark_pending(hctx, ctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1015 | } |
| 1016 | |
Christoph Hellwig | eeabc85 | 2014-03-21 08:57:37 -0600 | [diff] [blame] | 1017 | void blk_mq_insert_request(struct request *rq, bool at_head, bool run_queue, |
| 1018 | bool async) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1019 | { |
| 1020 | struct request_queue *q = rq->q; |
| 1021 | struct blk_mq_hw_ctx *hctx; |
Christoph Hellwig | eeabc85 | 2014-03-21 08:57:37 -0600 | [diff] [blame] | 1022 | struct blk_mq_ctx *ctx = rq->mq_ctx, *current_ctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1023 | |
| 1024 | current_ctx = blk_mq_get_ctx(q); |
Christoph Hellwig | eeabc85 | 2014-03-21 08:57:37 -0600 | [diff] [blame] | 1025 | if (!cpu_online(ctx->cpu)) |
| 1026 | rq->mq_ctx = ctx = current_ctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1027 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1028 | hctx = q->mq_ops->map_queue(q, ctx->cpu); |
| 1029 | |
Christoph Hellwig | a57a178 | 2014-09-16 14:44:07 -0700 | [diff] [blame] | 1030 | spin_lock(&ctx->lock); |
| 1031 | __blk_mq_insert_request(hctx, rq, at_head); |
| 1032 | spin_unlock(&ctx->lock); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1033 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1034 | if (run_queue) |
| 1035 | blk_mq_run_hw_queue(hctx, async); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1036 | |
| 1037 | blk_mq_put_ctx(current_ctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1038 | } |
| 1039 | |
| 1040 | static void blk_mq_insert_requests(struct request_queue *q, |
| 1041 | struct blk_mq_ctx *ctx, |
| 1042 | struct list_head *list, |
| 1043 | int depth, |
| 1044 | bool from_schedule) |
| 1045 | |
| 1046 | { |
| 1047 | struct blk_mq_hw_ctx *hctx; |
| 1048 | struct blk_mq_ctx *current_ctx; |
| 1049 | |
| 1050 | trace_block_unplug(q, depth, !from_schedule); |
| 1051 | |
| 1052 | current_ctx = blk_mq_get_ctx(q); |
| 1053 | |
| 1054 | if (!cpu_online(ctx->cpu)) |
| 1055 | ctx = current_ctx; |
| 1056 | hctx = q->mq_ops->map_queue(q, ctx->cpu); |
| 1057 | |
| 1058 | /* |
| 1059 | * preemption doesn't flush plug list, so it's possible ctx->cpu is |
| 1060 | * offline now |
| 1061 | */ |
| 1062 | spin_lock(&ctx->lock); |
| 1063 | while (!list_empty(list)) { |
| 1064 | struct request *rq; |
| 1065 | |
| 1066 | rq = list_first_entry(list, struct request, queuelist); |
| 1067 | list_del_init(&rq->queuelist); |
| 1068 | rq->mq_ctx = ctx; |
Christoph Hellwig | 72a0a36 | 2014-02-07 10:22:36 -0800 | [diff] [blame] | 1069 | __blk_mq_insert_request(hctx, rq, false); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1070 | } |
| 1071 | spin_unlock(&ctx->lock); |
| 1072 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1073 | blk_mq_run_hw_queue(hctx, from_schedule); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1074 | blk_mq_put_ctx(current_ctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1075 | } |
| 1076 | |
| 1077 | static int plug_ctx_cmp(void *priv, struct list_head *a, struct list_head *b) |
| 1078 | { |
| 1079 | struct request *rqa = container_of(a, struct request, queuelist); |
| 1080 | struct request *rqb = container_of(b, struct request, queuelist); |
| 1081 | |
| 1082 | return !(rqa->mq_ctx < rqb->mq_ctx || |
| 1083 | (rqa->mq_ctx == rqb->mq_ctx && |
| 1084 | blk_rq_pos(rqa) < blk_rq_pos(rqb))); |
| 1085 | } |
| 1086 | |
| 1087 | void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule) |
| 1088 | { |
| 1089 | struct blk_mq_ctx *this_ctx; |
| 1090 | struct request_queue *this_q; |
| 1091 | struct request *rq; |
| 1092 | LIST_HEAD(list); |
| 1093 | LIST_HEAD(ctx_list); |
| 1094 | unsigned int depth; |
| 1095 | |
| 1096 | list_splice_init(&plug->mq_list, &list); |
| 1097 | |
| 1098 | list_sort(NULL, &list, plug_ctx_cmp); |
| 1099 | |
| 1100 | this_q = NULL; |
| 1101 | this_ctx = NULL; |
| 1102 | depth = 0; |
| 1103 | |
| 1104 | while (!list_empty(&list)) { |
| 1105 | rq = list_entry_rq(list.next); |
| 1106 | list_del_init(&rq->queuelist); |
| 1107 | BUG_ON(!rq->q); |
| 1108 | if (rq->mq_ctx != this_ctx) { |
| 1109 | if (this_ctx) { |
| 1110 | blk_mq_insert_requests(this_q, this_ctx, |
| 1111 | &ctx_list, depth, |
| 1112 | from_schedule); |
| 1113 | } |
| 1114 | |
| 1115 | this_ctx = rq->mq_ctx; |
| 1116 | this_q = rq->q; |
| 1117 | depth = 0; |
| 1118 | } |
| 1119 | |
| 1120 | depth++; |
| 1121 | list_add_tail(&rq->queuelist, &ctx_list); |
| 1122 | } |
| 1123 | |
| 1124 | /* |
| 1125 | * If 'this_ctx' is set, we know we have entries to complete |
| 1126 | * on 'ctx_list'. Do those. |
| 1127 | */ |
| 1128 | if (this_ctx) { |
| 1129 | blk_mq_insert_requests(this_q, this_ctx, &ctx_list, depth, |
| 1130 | from_schedule); |
| 1131 | } |
| 1132 | } |
| 1133 | |
| 1134 | static void blk_mq_bio_to_request(struct request *rq, struct bio *bio) |
| 1135 | { |
| 1136 | init_request_from_bio(rq, bio); |
Jens Axboe | 4b57052 | 2014-05-29 11:00:11 -0600 | [diff] [blame] | 1137 | |
Jens Axboe | 3ee3237 | 2014-06-09 09:36:53 -0600 | [diff] [blame] | 1138 | if (blk_do_io_stat(rq)) |
Jens Axboe | 4b57052 | 2014-05-29 11:00:11 -0600 | [diff] [blame] | 1139 | blk_account_io_start(rq, 1); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1140 | } |
| 1141 | |
Jens Axboe | 274a584 | 2014-08-15 12:44:08 -0600 | [diff] [blame] | 1142 | static inline bool hctx_allow_merges(struct blk_mq_hw_ctx *hctx) |
| 1143 | { |
| 1144 | return (hctx->flags & BLK_MQ_F_SHOULD_MERGE) && |
| 1145 | !blk_queue_nomerges(hctx->queue); |
| 1146 | } |
| 1147 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1148 | static inline bool blk_mq_merge_queue_io(struct blk_mq_hw_ctx *hctx, |
| 1149 | struct blk_mq_ctx *ctx, |
| 1150 | struct request *rq, struct bio *bio) |
| 1151 | { |
Jens Axboe | 274a584 | 2014-08-15 12:44:08 -0600 | [diff] [blame] | 1152 | if (!hctx_allow_merges(hctx)) { |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1153 | blk_mq_bio_to_request(rq, bio); |
| 1154 | spin_lock(&ctx->lock); |
| 1155 | insert_rq: |
| 1156 | __blk_mq_insert_request(hctx, rq, false); |
| 1157 | spin_unlock(&ctx->lock); |
| 1158 | return false; |
| 1159 | } else { |
Jens Axboe | 274a584 | 2014-08-15 12:44:08 -0600 | [diff] [blame] | 1160 | struct request_queue *q = hctx->queue; |
| 1161 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1162 | spin_lock(&ctx->lock); |
| 1163 | if (!blk_mq_attempt_merge(q, ctx, bio)) { |
| 1164 | blk_mq_bio_to_request(rq, bio); |
| 1165 | goto insert_rq; |
| 1166 | } |
| 1167 | |
| 1168 | spin_unlock(&ctx->lock); |
| 1169 | __blk_mq_free_request(hctx, ctx, rq); |
| 1170 | return true; |
| 1171 | } |
| 1172 | } |
| 1173 | |
| 1174 | struct blk_map_ctx { |
| 1175 | struct blk_mq_hw_ctx *hctx; |
| 1176 | struct blk_mq_ctx *ctx; |
| 1177 | }; |
| 1178 | |
| 1179 | static struct request *blk_mq_map_request(struct request_queue *q, |
| 1180 | struct bio *bio, |
| 1181 | struct blk_map_ctx *data) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1182 | { |
| 1183 | struct blk_mq_hw_ctx *hctx; |
| 1184 | struct blk_mq_ctx *ctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1185 | struct request *rq; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1186 | int rw = bio_data_dir(bio); |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 1187 | struct blk_mq_alloc_data alloc_data; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1188 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1189 | if (unlikely(blk_mq_queue_enter(q))) { |
Nicholas Bellinger | 14ec77f | 2014-02-07 13:45:39 -0700 | [diff] [blame] | 1190 | bio_endio(bio, -EIO); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1191 | return NULL; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1192 | } |
| 1193 | |
| 1194 | ctx = blk_mq_get_ctx(q); |
| 1195 | hctx = q->mq_ops->map_queue(q, ctx->cpu); |
| 1196 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1197 | if (rw_is_sync(bio->bi_rw)) |
Shaohua Li | 27fbf4e | 2014-02-19 20:20:21 +0800 | [diff] [blame] | 1198 | rw |= REQ_SYNC; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1199 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1200 | trace_block_getrq(q, bio, rw); |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 1201 | blk_mq_set_alloc_data(&alloc_data, q, GFP_ATOMIC, false, ctx, |
| 1202 | hctx); |
| 1203 | rq = __blk_mq_alloc_request(&alloc_data, rw); |
Christoph Hellwig | 5dee857 | 2014-05-27 20:59:47 +0200 | [diff] [blame] | 1204 | if (unlikely(!rq)) { |
Christoph Hellwig | 793597a | 2014-05-27 20:59:49 +0200 | [diff] [blame] | 1205 | __blk_mq_run_hw_queue(hctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1206 | blk_mq_put_ctx(ctx); |
| 1207 | trace_block_sleeprq(q, bio, rw); |
Christoph Hellwig | 793597a | 2014-05-27 20:59:49 +0200 | [diff] [blame] | 1208 | |
| 1209 | ctx = blk_mq_get_ctx(q); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1210 | hctx = q->mq_ops->map_queue(q, ctx->cpu); |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 1211 | blk_mq_set_alloc_data(&alloc_data, q, |
| 1212 | __GFP_WAIT|GFP_ATOMIC, false, ctx, hctx); |
| 1213 | rq = __blk_mq_alloc_request(&alloc_data, rw); |
| 1214 | ctx = alloc_data.ctx; |
| 1215 | hctx = alloc_data.hctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1216 | } |
| 1217 | |
| 1218 | hctx->queued++; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1219 | data->hctx = hctx; |
| 1220 | data->ctx = ctx; |
| 1221 | return rq; |
| 1222 | } |
| 1223 | |
| 1224 | /* |
| 1225 | * Multiple hardware queue variant. This will not use per-process plugs, |
| 1226 | * but will attempt to bypass the hctx queueing if we can go straight to |
| 1227 | * hardware for SYNC IO. |
| 1228 | */ |
| 1229 | static void blk_mq_make_request(struct request_queue *q, struct bio *bio) |
| 1230 | { |
| 1231 | const int is_sync = rw_is_sync(bio->bi_rw); |
| 1232 | const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA); |
| 1233 | struct blk_map_ctx data; |
| 1234 | struct request *rq; |
| 1235 | |
| 1236 | blk_queue_bounce(q, &bio); |
| 1237 | |
| 1238 | if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) { |
| 1239 | bio_endio(bio, -EIO); |
| 1240 | return; |
| 1241 | } |
| 1242 | |
| 1243 | rq = blk_mq_map_request(q, bio, &data); |
| 1244 | if (unlikely(!rq)) |
| 1245 | return; |
| 1246 | |
| 1247 | if (unlikely(is_flush_fua)) { |
| 1248 | blk_mq_bio_to_request(rq, bio); |
| 1249 | blk_insert_flush(rq); |
| 1250 | goto run_queue; |
| 1251 | } |
| 1252 | |
Jens Axboe | e167dfb | 2014-10-29 11:18:26 -0600 | [diff] [blame] | 1253 | /* |
| 1254 | * If the driver supports defer issued based on 'last', then |
| 1255 | * queue it up like normal since we can potentially save some |
| 1256 | * CPU this way. |
| 1257 | */ |
| 1258 | if (is_sync && !(data.hctx->flags & BLK_MQ_F_DEFER_ISSUE)) { |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 1259 | struct blk_mq_queue_data bd = { |
| 1260 | .rq = rq, |
| 1261 | .list = NULL, |
| 1262 | .last = 1 |
| 1263 | }; |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1264 | int ret; |
| 1265 | |
| 1266 | blk_mq_bio_to_request(rq, bio); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1267 | |
| 1268 | /* |
| 1269 | * For OK queue, we are done. For error, kill it. Any other |
| 1270 | * error (busy), just add it to our list as we previously |
| 1271 | * would have done |
| 1272 | */ |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 1273 | ret = q->mq_ops->queue_rq(data.hctx, &bd); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1274 | if (ret == BLK_MQ_RQ_QUEUE_OK) |
| 1275 | goto done; |
| 1276 | else { |
| 1277 | __blk_mq_requeue_request(rq); |
| 1278 | |
| 1279 | if (ret == BLK_MQ_RQ_QUEUE_ERROR) { |
| 1280 | rq->errors = -EIO; |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 1281 | blk_mq_end_request(rq, rq->errors); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1282 | goto done; |
| 1283 | } |
| 1284 | } |
| 1285 | } |
| 1286 | |
| 1287 | if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) { |
| 1288 | /* |
| 1289 | * For a SYNC request, send it to the hardware immediately. For |
| 1290 | * an ASYNC request, just ensure that we run it later on. The |
| 1291 | * latter allows for merging opportunities and more efficient |
| 1292 | * dispatching. |
| 1293 | */ |
| 1294 | run_queue: |
| 1295 | blk_mq_run_hw_queue(data.hctx, !is_sync || is_flush_fua); |
| 1296 | } |
| 1297 | done: |
| 1298 | blk_mq_put_ctx(data.ctx); |
| 1299 | } |
| 1300 | |
| 1301 | /* |
| 1302 | * Single hardware queue variant. This will attempt to use any per-process |
| 1303 | * plug for merging and IO deferral. |
| 1304 | */ |
| 1305 | static void blk_sq_make_request(struct request_queue *q, struct bio *bio) |
| 1306 | { |
| 1307 | const int is_sync = rw_is_sync(bio->bi_rw); |
| 1308 | const int is_flush_fua = bio->bi_rw & (REQ_FLUSH | REQ_FUA); |
| 1309 | unsigned int use_plug, request_count = 0; |
| 1310 | struct blk_map_ctx data; |
| 1311 | struct request *rq; |
| 1312 | |
| 1313 | /* |
| 1314 | * If we have multiple hardware queues, just go directly to |
| 1315 | * one of those for sync IO. |
| 1316 | */ |
| 1317 | use_plug = !is_flush_fua && !is_sync; |
| 1318 | |
| 1319 | blk_queue_bounce(q, &bio); |
| 1320 | |
| 1321 | if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) { |
| 1322 | bio_endio(bio, -EIO); |
| 1323 | return; |
| 1324 | } |
| 1325 | |
| 1326 | if (use_plug && !blk_queue_nomerges(q) && |
| 1327 | blk_attempt_plug_merge(q, bio, &request_count)) |
| 1328 | return; |
| 1329 | |
| 1330 | rq = blk_mq_map_request(q, bio, &data); |
Jens Axboe | ff87bce | 2014-06-03 11:59:49 -0600 | [diff] [blame] | 1331 | if (unlikely(!rq)) |
| 1332 | return; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1333 | |
| 1334 | if (unlikely(is_flush_fua)) { |
| 1335 | blk_mq_bio_to_request(rq, bio); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1336 | blk_insert_flush(rq); |
| 1337 | goto run_queue; |
| 1338 | } |
| 1339 | |
| 1340 | /* |
| 1341 | * A task plug currently exists. Since this is completely lockless, |
| 1342 | * utilize that to temporarily store requests until the task is |
| 1343 | * either done or scheduled away. |
| 1344 | */ |
| 1345 | if (use_plug) { |
| 1346 | struct blk_plug *plug = current->plug; |
| 1347 | |
| 1348 | if (plug) { |
| 1349 | blk_mq_bio_to_request(rq, bio); |
Shaohua Li | 92f399c | 2013-10-29 12:01:03 -0600 | [diff] [blame] | 1350 | if (list_empty(&plug->mq_list)) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1351 | trace_block_plug(q); |
| 1352 | else if (request_count >= BLK_MAX_REQUEST_COUNT) { |
| 1353 | blk_flush_plug_list(plug, false); |
| 1354 | trace_block_plug(q); |
| 1355 | } |
| 1356 | list_add_tail(&rq->queuelist, &plug->mq_list); |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1357 | blk_mq_put_ctx(data.ctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1358 | return; |
| 1359 | } |
| 1360 | } |
| 1361 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1362 | if (!blk_mq_merge_queue_io(data.hctx, data.ctx, rq, bio)) { |
| 1363 | /* |
| 1364 | * For a SYNC request, send it to the hardware immediately. For |
| 1365 | * an ASYNC request, just ensure that we run it later on. The |
| 1366 | * latter allows for merging opportunities and more efficient |
| 1367 | * dispatching. |
| 1368 | */ |
| 1369 | run_queue: |
| 1370 | blk_mq_run_hw_queue(data.hctx, !is_sync || is_flush_fua); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1371 | } |
| 1372 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1373 | blk_mq_put_ctx(data.ctx); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1374 | } |
| 1375 | |
| 1376 | /* |
| 1377 | * Default mapping to a software queue, since we use one per CPU. |
| 1378 | */ |
| 1379 | struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, const int cpu) |
| 1380 | { |
| 1381 | return q->queue_hw_ctx[q->mq_map[cpu]]; |
| 1382 | } |
| 1383 | EXPORT_SYMBOL(blk_mq_map_queue); |
| 1384 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1385 | static void blk_mq_free_rq_map(struct blk_mq_tag_set *set, |
| 1386 | struct blk_mq_tags *tags, unsigned int hctx_idx) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1387 | { |
| 1388 | struct page *page; |
| 1389 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1390 | if (tags->rqs && set->ops->exit_request) { |
Christoph Hellwig | e9b267d | 2014-04-15 13:59:10 -0600 | [diff] [blame] | 1391 | int i; |
| 1392 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1393 | for (i = 0; i < tags->nr_tags; i++) { |
| 1394 | if (!tags->rqs[i]) |
Christoph Hellwig | e9b267d | 2014-04-15 13:59:10 -0600 | [diff] [blame] | 1395 | continue; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1396 | set->ops->exit_request(set->driver_data, tags->rqs[i], |
| 1397 | hctx_idx, i); |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1398 | tags->rqs[i] = NULL; |
Christoph Hellwig | e9b267d | 2014-04-15 13:59:10 -0600 | [diff] [blame] | 1399 | } |
| 1400 | } |
| 1401 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1402 | while (!list_empty(&tags->page_list)) { |
| 1403 | page = list_first_entry(&tags->page_list, struct page, lru); |
Dave Hansen | 6753471 | 2014-01-08 20:17:46 -0700 | [diff] [blame] | 1404 | list_del_init(&page->lru); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1405 | __free_pages(page, page->private); |
| 1406 | } |
| 1407 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1408 | kfree(tags->rqs); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1409 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1410 | blk_mq_free_tags(tags); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1411 | } |
| 1412 | |
| 1413 | static size_t order_to_size(unsigned int order) |
| 1414 | { |
Ming Lei | 4ca0850 | 2014-04-19 18:00:18 +0800 | [diff] [blame] | 1415 | return (size_t)PAGE_SIZE << order; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1416 | } |
| 1417 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1418 | static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set, |
| 1419 | unsigned int hctx_idx) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1420 | { |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1421 | struct blk_mq_tags *tags; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1422 | unsigned int i, j, entries_per_page, max_order = 4; |
| 1423 | size_t rq_size, left; |
| 1424 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1425 | tags = blk_mq_init_tags(set->queue_depth, set->reserved_tags, |
Shaohua Li | 24391c0 | 2015-01-23 14:18:00 -0700 | [diff] [blame] | 1426 | set->numa_node, |
| 1427 | BLK_MQ_FLAG_TO_ALLOC_POLICY(set->flags)); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1428 | if (!tags) |
| 1429 | return NULL; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1430 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1431 | INIT_LIST_HEAD(&tags->page_list); |
| 1432 | |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1433 | tags->rqs = kzalloc_node(set->queue_depth * sizeof(struct request *), |
| 1434 | GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY, |
| 1435 | set->numa_node); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1436 | if (!tags->rqs) { |
| 1437 | blk_mq_free_tags(tags); |
| 1438 | return NULL; |
| 1439 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1440 | |
| 1441 | /* |
| 1442 | * rq_size is the size of the request plus driver payload, rounded |
| 1443 | * to the cacheline size |
| 1444 | */ |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1445 | rq_size = round_up(sizeof(struct request) + set->cmd_size, |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1446 | cache_line_size()); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1447 | left = rq_size * set->queue_depth; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1448 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1449 | for (i = 0; i < set->queue_depth; ) { |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1450 | int this_order = max_order; |
| 1451 | struct page *page; |
| 1452 | int to_do; |
| 1453 | void *p; |
| 1454 | |
| 1455 | while (left < order_to_size(this_order - 1) && this_order) |
| 1456 | this_order--; |
| 1457 | |
| 1458 | do { |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1459 | page = alloc_pages_node(set->numa_node, |
Linus Torvalds | ac21117 | 2015-04-09 14:12:22 -0700 | [diff] [blame] | 1460 | GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO, |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1461 | this_order); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1462 | if (page) |
| 1463 | break; |
| 1464 | if (!this_order--) |
| 1465 | break; |
| 1466 | if (order_to_size(this_order) < rq_size) |
| 1467 | break; |
| 1468 | } while (1); |
| 1469 | |
| 1470 | if (!page) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1471 | goto fail; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1472 | |
| 1473 | page->private = this_order; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1474 | list_add_tail(&page->lru, &tags->page_list); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1475 | |
| 1476 | p = page_address(page); |
| 1477 | entries_per_page = order_to_size(this_order) / rq_size; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1478 | to_do = min(entries_per_page, set->queue_depth - i); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1479 | left -= to_do * rq_size; |
| 1480 | for (j = 0; j < to_do; j++) { |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1481 | tags->rqs[i] = p; |
| 1482 | if (set->ops->init_request) { |
| 1483 | if (set->ops->init_request(set->driver_data, |
| 1484 | tags->rqs[i], hctx_idx, i, |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1485 | set->numa_node)) { |
| 1486 | tags->rqs[i] = NULL; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1487 | goto fail; |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 1488 | } |
Christoph Hellwig | e9b267d | 2014-04-15 13:59:10 -0600 | [diff] [blame] | 1489 | } |
| 1490 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1491 | p += rq_size; |
| 1492 | i++; |
| 1493 | } |
| 1494 | } |
| 1495 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1496 | return tags; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1497 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1498 | fail: |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1499 | blk_mq_free_rq_map(set, tags, hctx_idx); |
| 1500 | return NULL; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1501 | } |
| 1502 | |
Jens Axboe | 1429d7c | 2014-05-19 09:23:55 -0600 | [diff] [blame] | 1503 | static void blk_mq_free_bitmap(struct blk_mq_ctxmap *bitmap) |
| 1504 | { |
| 1505 | kfree(bitmap->map); |
| 1506 | } |
| 1507 | |
| 1508 | static int blk_mq_alloc_bitmap(struct blk_mq_ctxmap *bitmap, int node) |
| 1509 | { |
| 1510 | unsigned int bpw = 8, total, num_maps, i; |
| 1511 | |
| 1512 | bitmap->bits_per_word = bpw; |
| 1513 | |
| 1514 | num_maps = ALIGN(nr_cpu_ids, bpw) / bpw; |
| 1515 | bitmap->map = kzalloc_node(num_maps * sizeof(struct blk_align_bitmap), |
| 1516 | GFP_KERNEL, node); |
| 1517 | if (!bitmap->map) |
| 1518 | return -ENOMEM; |
| 1519 | |
| 1520 | bitmap->map_size = num_maps; |
| 1521 | |
| 1522 | total = nr_cpu_ids; |
| 1523 | for (i = 0; i < num_maps; i++) { |
| 1524 | bitmap->map[i].depth = min(total, bitmap->bits_per_word); |
| 1525 | total -= bitmap->map[i].depth; |
| 1526 | } |
| 1527 | |
| 1528 | return 0; |
| 1529 | } |
| 1530 | |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1531 | static int blk_mq_hctx_cpu_offline(struct blk_mq_hw_ctx *hctx, int cpu) |
| 1532 | { |
| 1533 | struct request_queue *q = hctx->queue; |
| 1534 | struct blk_mq_ctx *ctx; |
| 1535 | LIST_HEAD(tmp); |
| 1536 | |
| 1537 | /* |
| 1538 | * Move ctx entries to new CPU, if this one is going away. |
| 1539 | */ |
| 1540 | ctx = __blk_mq_get_ctx(q, cpu); |
| 1541 | |
| 1542 | spin_lock(&ctx->lock); |
| 1543 | if (!list_empty(&ctx->rq_list)) { |
| 1544 | list_splice_init(&ctx->rq_list, &tmp); |
| 1545 | blk_mq_hctx_clear_pending(hctx, ctx); |
| 1546 | } |
| 1547 | spin_unlock(&ctx->lock); |
| 1548 | |
| 1549 | if (list_empty(&tmp)) |
| 1550 | return NOTIFY_OK; |
| 1551 | |
| 1552 | ctx = blk_mq_get_ctx(q); |
| 1553 | spin_lock(&ctx->lock); |
| 1554 | |
| 1555 | while (!list_empty(&tmp)) { |
| 1556 | struct request *rq; |
| 1557 | |
| 1558 | rq = list_first_entry(&tmp, struct request, queuelist); |
| 1559 | rq->mq_ctx = ctx; |
| 1560 | list_move_tail(&rq->queuelist, &ctx->rq_list); |
| 1561 | } |
| 1562 | |
| 1563 | hctx = q->mq_ops->map_queue(q, ctx->cpu); |
| 1564 | blk_mq_hctx_mark_pending(hctx, ctx); |
| 1565 | |
| 1566 | spin_unlock(&ctx->lock); |
| 1567 | |
| 1568 | blk_mq_run_hw_queue(hctx, true); |
| 1569 | blk_mq_put_ctx(ctx); |
| 1570 | return NOTIFY_OK; |
| 1571 | } |
| 1572 | |
| 1573 | static int blk_mq_hctx_cpu_online(struct blk_mq_hw_ctx *hctx, int cpu) |
| 1574 | { |
| 1575 | struct request_queue *q = hctx->queue; |
| 1576 | struct blk_mq_tag_set *set = q->tag_set; |
| 1577 | |
| 1578 | if (set->tags[hctx->queue_num]) |
| 1579 | return NOTIFY_OK; |
| 1580 | |
| 1581 | set->tags[hctx->queue_num] = blk_mq_init_rq_map(set, hctx->queue_num); |
| 1582 | if (!set->tags[hctx->queue_num]) |
| 1583 | return NOTIFY_STOP; |
| 1584 | |
| 1585 | hctx->tags = set->tags[hctx->queue_num]; |
| 1586 | return NOTIFY_OK; |
| 1587 | } |
| 1588 | |
| 1589 | static int blk_mq_hctx_notify(void *data, unsigned long action, |
| 1590 | unsigned int cpu) |
| 1591 | { |
| 1592 | struct blk_mq_hw_ctx *hctx = data; |
| 1593 | |
| 1594 | if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) |
| 1595 | return blk_mq_hctx_cpu_offline(hctx, cpu); |
| 1596 | else if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN) |
| 1597 | return blk_mq_hctx_cpu_online(hctx, cpu); |
| 1598 | |
| 1599 | return NOTIFY_OK; |
| 1600 | } |
| 1601 | |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1602 | static void blk_mq_exit_hctx(struct request_queue *q, |
| 1603 | struct blk_mq_tag_set *set, |
| 1604 | struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) |
| 1605 | { |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1606 | unsigned flush_start_tag = set->queue_depth; |
| 1607 | |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1608 | blk_mq_tag_idle(hctx); |
| 1609 | |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1610 | if (set->ops->exit_request) |
| 1611 | set->ops->exit_request(set->driver_data, |
| 1612 | hctx->fq->flush_rq, hctx_idx, |
| 1613 | flush_start_tag + hctx_idx); |
| 1614 | |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1615 | if (set->ops->exit_hctx) |
| 1616 | set->ops->exit_hctx(hctx, hctx_idx); |
| 1617 | |
| 1618 | blk_mq_unregister_cpu_notifier(&hctx->cpu_notifier); |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1619 | blk_free_flush_queue(hctx->fq); |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1620 | kfree(hctx->ctxs); |
| 1621 | blk_mq_free_bitmap(&hctx->ctx_map); |
| 1622 | } |
| 1623 | |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1624 | static void blk_mq_exit_hw_queues(struct request_queue *q, |
| 1625 | struct blk_mq_tag_set *set, int nr_queue) |
| 1626 | { |
| 1627 | struct blk_mq_hw_ctx *hctx; |
| 1628 | unsigned int i; |
| 1629 | |
| 1630 | queue_for_each_hw_ctx(q, hctx, i) { |
| 1631 | if (i == nr_queue) |
| 1632 | break; |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1633 | blk_mq_exit_hctx(q, set, hctx, i); |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1634 | } |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1635 | } |
| 1636 | |
| 1637 | static void blk_mq_free_hw_queues(struct request_queue *q, |
| 1638 | struct blk_mq_tag_set *set) |
| 1639 | { |
| 1640 | struct blk_mq_hw_ctx *hctx; |
| 1641 | unsigned int i; |
| 1642 | |
Ming Lei | e09aae7 | 2015-01-29 20:17:27 +0800 | [diff] [blame] | 1643 | queue_for_each_hw_ctx(q, hctx, i) |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1644 | free_cpumask_var(hctx->cpumask); |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1645 | } |
| 1646 | |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1647 | static int blk_mq_init_hctx(struct request_queue *q, |
| 1648 | struct blk_mq_tag_set *set, |
| 1649 | struct blk_mq_hw_ctx *hctx, unsigned hctx_idx) |
| 1650 | { |
| 1651 | int node; |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1652 | unsigned flush_start_tag = set->queue_depth; |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1653 | |
| 1654 | node = hctx->numa_node; |
| 1655 | if (node == NUMA_NO_NODE) |
| 1656 | node = hctx->numa_node = set->numa_node; |
| 1657 | |
| 1658 | INIT_DELAYED_WORK(&hctx->run_work, blk_mq_run_work_fn); |
| 1659 | INIT_DELAYED_WORK(&hctx->delay_work, blk_mq_delay_work_fn); |
| 1660 | spin_lock_init(&hctx->lock); |
| 1661 | INIT_LIST_HEAD(&hctx->dispatch); |
| 1662 | hctx->queue = q; |
| 1663 | hctx->queue_num = hctx_idx; |
| 1664 | hctx->flags = set->flags; |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1665 | |
| 1666 | blk_mq_init_cpu_notifier(&hctx->cpu_notifier, |
| 1667 | blk_mq_hctx_notify, hctx); |
| 1668 | blk_mq_register_cpu_notifier(&hctx->cpu_notifier); |
| 1669 | |
| 1670 | hctx->tags = set->tags[hctx_idx]; |
| 1671 | |
| 1672 | /* |
| 1673 | * Allocate space for all possible cpus to avoid allocation at |
| 1674 | * runtime |
| 1675 | */ |
| 1676 | hctx->ctxs = kmalloc_node(nr_cpu_ids * sizeof(void *), |
| 1677 | GFP_KERNEL, node); |
| 1678 | if (!hctx->ctxs) |
| 1679 | goto unregister_cpu_notifier; |
| 1680 | |
| 1681 | if (blk_mq_alloc_bitmap(&hctx->ctx_map, node)) |
| 1682 | goto free_ctxs; |
| 1683 | |
| 1684 | hctx->nr_ctx = 0; |
| 1685 | |
| 1686 | if (set->ops->init_hctx && |
| 1687 | set->ops->init_hctx(hctx, set->driver_data, hctx_idx)) |
| 1688 | goto free_bitmap; |
| 1689 | |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1690 | hctx->fq = blk_alloc_flush_queue(q, hctx->numa_node, set->cmd_size); |
| 1691 | if (!hctx->fq) |
| 1692 | goto exit_hctx; |
| 1693 | |
| 1694 | if (set->ops->init_request && |
| 1695 | set->ops->init_request(set->driver_data, |
| 1696 | hctx->fq->flush_rq, hctx_idx, |
| 1697 | flush_start_tag + hctx_idx, node)) |
| 1698 | goto free_fq; |
| 1699 | |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1700 | return 0; |
| 1701 | |
Ming Lei | f70ced0 | 2014-09-25 23:23:47 +0800 | [diff] [blame] | 1702 | free_fq: |
| 1703 | kfree(hctx->fq); |
| 1704 | exit_hctx: |
| 1705 | if (set->ops->exit_hctx) |
| 1706 | set->ops->exit_hctx(hctx, hctx_idx); |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1707 | free_bitmap: |
| 1708 | blk_mq_free_bitmap(&hctx->ctx_map); |
| 1709 | free_ctxs: |
| 1710 | kfree(hctx->ctxs); |
| 1711 | unregister_cpu_notifier: |
| 1712 | blk_mq_unregister_cpu_notifier(&hctx->cpu_notifier); |
| 1713 | |
| 1714 | return -1; |
| 1715 | } |
| 1716 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1717 | static int blk_mq_init_hw_queues(struct request_queue *q, |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1718 | struct blk_mq_tag_set *set) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1719 | { |
| 1720 | struct blk_mq_hw_ctx *hctx; |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1721 | unsigned int i; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1722 | |
| 1723 | /* |
| 1724 | * Initialize hardware queues |
| 1725 | */ |
| 1726 | queue_for_each_hw_ctx(q, hctx, i) { |
Ming Lei | 08e98fc | 2014-09-25 23:23:38 +0800 | [diff] [blame] | 1727 | if (blk_mq_init_hctx(q, set, hctx, i)) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1728 | break; |
| 1729 | } |
| 1730 | |
| 1731 | if (i == q->nr_hw_queues) |
| 1732 | return 0; |
| 1733 | |
| 1734 | /* |
| 1735 | * Init failed |
| 1736 | */ |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 1737 | blk_mq_exit_hw_queues(q, set, i); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1738 | |
| 1739 | return 1; |
| 1740 | } |
| 1741 | |
| 1742 | static void blk_mq_init_cpu_queues(struct request_queue *q, |
| 1743 | unsigned int nr_hw_queues) |
| 1744 | { |
| 1745 | unsigned int i; |
| 1746 | |
| 1747 | for_each_possible_cpu(i) { |
| 1748 | struct blk_mq_ctx *__ctx = per_cpu_ptr(q->queue_ctx, i); |
| 1749 | struct blk_mq_hw_ctx *hctx; |
| 1750 | |
| 1751 | memset(__ctx, 0, sizeof(*__ctx)); |
| 1752 | __ctx->cpu = i; |
| 1753 | spin_lock_init(&__ctx->lock); |
| 1754 | INIT_LIST_HEAD(&__ctx->rq_list); |
| 1755 | __ctx->queue = q; |
| 1756 | |
| 1757 | /* 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] | 1758 | if (!cpu_online(i)) |
| 1759 | continue; |
| 1760 | |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1761 | hctx = q->mq_ops->map_queue(q, i); |
| 1762 | cpumask_set_cpu(i, hctx->cpumask); |
| 1763 | hctx->nr_ctx++; |
| 1764 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1765 | /* |
| 1766 | * Set local node, IFF we have more than one hw queue. If |
| 1767 | * not, we remain on the home node of the device |
| 1768 | */ |
| 1769 | if (nr_hw_queues > 1 && hctx->numa_node == NUMA_NO_NODE) |
| 1770 | hctx->numa_node = cpu_to_node(i); |
| 1771 | } |
| 1772 | } |
| 1773 | |
| 1774 | static void blk_mq_map_swqueue(struct request_queue *q) |
| 1775 | { |
| 1776 | unsigned int i; |
| 1777 | struct blk_mq_hw_ctx *hctx; |
| 1778 | struct blk_mq_ctx *ctx; |
| 1779 | |
| 1780 | queue_for_each_hw_ctx(q, hctx, i) { |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1781 | cpumask_clear(hctx->cpumask); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1782 | hctx->nr_ctx = 0; |
| 1783 | } |
| 1784 | |
| 1785 | /* |
| 1786 | * Map software to hardware queues |
| 1787 | */ |
| 1788 | queue_for_each_ctx(q, ctx, i) { |
| 1789 | /* If the cpu isn't online, the cpu is mapped to first hctx */ |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1790 | if (!cpu_online(i)) |
| 1791 | continue; |
| 1792 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1793 | hctx = q->mq_ops->map_queue(q, i); |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1794 | cpumask_set_cpu(i, hctx->cpumask); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1795 | ctx->index_hw = hctx->nr_ctx; |
| 1796 | hctx->ctxs[hctx->nr_ctx++] = ctx; |
| 1797 | } |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 1798 | |
| 1799 | queue_for_each_hw_ctx(q, hctx, i) { |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1800 | /* |
Jens Axboe | a68aafa | 2014-08-15 13:19:15 -0600 | [diff] [blame] | 1801 | * If no software queues are mapped to this hardware queue, |
| 1802 | * disable it and free the request entries. |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1803 | */ |
| 1804 | if (!hctx->nr_ctx) { |
| 1805 | struct blk_mq_tag_set *set = q->tag_set; |
| 1806 | |
| 1807 | if (set->tags[i]) { |
| 1808 | blk_mq_free_rq_map(set, set->tags[i], i); |
| 1809 | set->tags[i] = NULL; |
| 1810 | hctx->tags = NULL; |
| 1811 | } |
| 1812 | continue; |
| 1813 | } |
| 1814 | |
| 1815 | /* |
| 1816 | * Initialize batch roundrobin counts |
| 1817 | */ |
Jens Axboe | 506e931 | 2014-05-07 10:26:44 -0600 | [diff] [blame] | 1818 | hctx->next_cpu = cpumask_first(hctx->cpumask); |
| 1819 | hctx->next_cpu_batch = BLK_MQ_CPU_WORK_BATCH; |
| 1820 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1821 | } |
| 1822 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1823 | static void blk_mq_update_tag_set_depth(struct blk_mq_tag_set *set) |
| 1824 | { |
| 1825 | struct blk_mq_hw_ctx *hctx; |
| 1826 | struct request_queue *q; |
| 1827 | bool shared; |
| 1828 | int i; |
| 1829 | |
| 1830 | if (set->tag_list.next == set->tag_list.prev) |
| 1831 | shared = false; |
| 1832 | else |
| 1833 | shared = true; |
| 1834 | |
| 1835 | list_for_each_entry(q, &set->tag_list, tag_set_list) { |
| 1836 | blk_mq_freeze_queue(q); |
| 1837 | |
| 1838 | queue_for_each_hw_ctx(q, hctx, i) { |
| 1839 | if (shared) |
| 1840 | hctx->flags |= BLK_MQ_F_TAG_SHARED; |
| 1841 | else |
| 1842 | hctx->flags &= ~BLK_MQ_F_TAG_SHARED; |
| 1843 | } |
| 1844 | blk_mq_unfreeze_queue(q); |
| 1845 | } |
| 1846 | } |
| 1847 | |
| 1848 | static void blk_mq_del_queue_tag_set(struct request_queue *q) |
| 1849 | { |
| 1850 | struct blk_mq_tag_set *set = q->tag_set; |
| 1851 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1852 | mutex_lock(&set->tag_list_lock); |
| 1853 | list_del_init(&q->tag_set_list); |
| 1854 | blk_mq_update_tag_set_depth(set); |
| 1855 | mutex_unlock(&set->tag_list_lock); |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1856 | } |
| 1857 | |
| 1858 | static void blk_mq_add_queue_tag_set(struct blk_mq_tag_set *set, |
| 1859 | struct request_queue *q) |
| 1860 | { |
| 1861 | q->tag_set = set; |
| 1862 | |
| 1863 | mutex_lock(&set->tag_list_lock); |
| 1864 | list_add_tail(&q->tag_set_list, &set->tag_list); |
| 1865 | blk_mq_update_tag_set_depth(set); |
| 1866 | mutex_unlock(&set->tag_list_lock); |
| 1867 | } |
| 1868 | |
Ming Lei | e09aae7 | 2015-01-29 20:17:27 +0800 | [diff] [blame] | 1869 | /* |
| 1870 | * It is the actual release handler for mq, but we do it from |
| 1871 | * request queue's release handler for avoiding use-after-free |
| 1872 | * and headache because q->mq_kobj shouldn't have been introduced, |
| 1873 | * but we can't group ctx/kctx kobj without it. |
| 1874 | */ |
| 1875 | void blk_mq_release(struct request_queue *q) |
| 1876 | { |
| 1877 | struct blk_mq_hw_ctx *hctx; |
| 1878 | unsigned int i; |
| 1879 | |
| 1880 | /* hctx kobj stays in hctx */ |
| 1881 | queue_for_each_hw_ctx(q, hctx, i) |
| 1882 | kfree(hctx); |
| 1883 | |
| 1884 | kfree(q->queue_hw_ctx); |
| 1885 | |
| 1886 | /* ctx kobj stays in queue_ctx */ |
| 1887 | free_percpu(q->queue_ctx); |
| 1888 | } |
| 1889 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1890 | 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] | 1891 | { |
| 1892 | struct blk_mq_hw_ctx **hctxs; |
Ming Lei | e6cdb09 | 2014-06-03 11:24:06 +0800 | [diff] [blame] | 1893 | struct blk_mq_ctx __percpu *ctx; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1894 | struct request_queue *q; |
Jens Axboe | f14bbe7 | 2014-05-27 12:06:53 -0600 | [diff] [blame] | 1895 | unsigned int *map; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1896 | int i; |
| 1897 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1898 | ctx = alloc_percpu(struct blk_mq_ctx); |
| 1899 | if (!ctx) |
| 1900 | return ERR_PTR(-ENOMEM); |
| 1901 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1902 | hctxs = kmalloc_node(set->nr_hw_queues * sizeof(*hctxs), GFP_KERNEL, |
| 1903 | set->numa_node); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1904 | |
| 1905 | if (!hctxs) |
| 1906 | goto err_percpu; |
| 1907 | |
Jens Axboe | f14bbe7 | 2014-05-27 12:06:53 -0600 | [diff] [blame] | 1908 | map = blk_mq_make_queue_map(set); |
| 1909 | if (!map) |
| 1910 | goto err_map; |
| 1911 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1912 | for (i = 0; i < set->nr_hw_queues; i++) { |
Jens Axboe | f14bbe7 | 2014-05-27 12:06:53 -0600 | [diff] [blame] | 1913 | int node = blk_mq_hw_queue_to_node(map, i); |
| 1914 | |
Christoph Hellwig | cdef54d | 2014-05-28 18:11:06 +0200 | [diff] [blame] | 1915 | hctxs[i] = kzalloc_node(sizeof(struct blk_mq_hw_ctx), |
| 1916 | GFP_KERNEL, node); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1917 | if (!hctxs[i]) |
| 1918 | goto err_hctxs; |
| 1919 | |
Jens Axboe | a86073e | 2014-10-13 15:41:54 -0600 | [diff] [blame] | 1920 | if (!zalloc_cpumask_var_node(&hctxs[i]->cpumask, GFP_KERNEL, |
| 1921 | node)) |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 1922 | goto err_hctxs; |
| 1923 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1924 | atomic_set(&hctxs[i]->nr_active, 0); |
Jens Axboe | f14bbe7 | 2014-05-27 12:06:53 -0600 | [diff] [blame] | 1925 | hctxs[i]->numa_node = node; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1926 | hctxs[i]->queue_num = i; |
| 1927 | } |
| 1928 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1929 | q = blk_alloc_queue_node(GFP_KERNEL, set->numa_node); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1930 | if (!q) |
| 1931 | goto err_hctxs; |
| 1932 | |
Tejun Heo | 17497ac | 2014-09-24 13:31:50 -0400 | [diff] [blame] | 1933 | /* |
| 1934 | * Init percpu_ref in atomic mode so that it's faster to shutdown. |
| 1935 | * See blk_register_queue() for details. |
| 1936 | */ |
Tejun Heo | a34375e | 2014-09-08 09:51:30 +0900 | [diff] [blame] | 1937 | if (percpu_ref_init(&q->mq_usage_counter, blk_mq_usage_counter_release, |
Tejun Heo | 17497ac | 2014-09-24 13:31:50 -0400 | [diff] [blame] | 1938 | PERCPU_REF_INIT_ATOMIC, GFP_KERNEL)) |
Mike Snitzer | 9a30b09 | 2015-03-12 23:53:26 -0400 | [diff] [blame] | 1939 | goto err_mq_usage; |
Ming Lei | 3d2936f | 2014-05-27 23:35:14 +0800 | [diff] [blame] | 1940 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1941 | setup_timer(&q->timeout, blk_mq_rq_timer, (unsigned long) q); |
| 1942 | blk_queue_rq_timeout(q, 30000); |
| 1943 | |
| 1944 | q->nr_queues = nr_cpu_ids; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1945 | q->nr_hw_queues = set->nr_hw_queues; |
Jens Axboe | f14bbe7 | 2014-05-27 12:06:53 -0600 | [diff] [blame] | 1946 | q->mq_map = map; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1947 | |
| 1948 | q->queue_ctx = ctx; |
| 1949 | q->queue_hw_ctx = hctxs; |
| 1950 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1951 | q->mq_ops = set->ops; |
Jens Axboe | 94eddfb | 2013-11-19 09:25:07 -0700 | [diff] [blame] | 1952 | q->queue_flags |= QUEUE_FLAG_MQ_DEFAULT; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1953 | |
Jens Axboe | 05f1dd5 | 2014-05-29 09:53:32 -0600 | [diff] [blame] | 1954 | if (!(set->flags & BLK_MQ_F_SG_MERGE)) |
| 1955 | q->queue_flags |= 1 << QUEUE_FLAG_NO_SG_MERGE; |
| 1956 | |
Christoph Hellwig | 1be036e | 2014-02-07 10:22:39 -0800 | [diff] [blame] | 1957 | q->sg_reserved_size = INT_MAX; |
| 1958 | |
Christoph Hellwig | 6fca6a6 | 2014-05-28 08:08:02 -0600 | [diff] [blame] | 1959 | INIT_WORK(&q->requeue_work, blk_mq_requeue_work); |
| 1960 | INIT_LIST_HEAD(&q->requeue_list); |
| 1961 | spin_lock_init(&q->requeue_lock); |
| 1962 | |
Jens Axboe | 07068d5 | 2014-05-22 10:40:51 -0600 | [diff] [blame] | 1963 | if (q->nr_hw_queues > 1) |
| 1964 | blk_queue_make_request(q, blk_mq_make_request); |
| 1965 | else |
| 1966 | blk_queue_make_request(q, blk_sq_make_request); |
| 1967 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1968 | if (set->timeout) |
| 1969 | blk_queue_rq_timeout(q, set->timeout); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1970 | |
Jens Axboe | eba7176 | 2014-05-20 15:17:27 -0600 | [diff] [blame] | 1971 | /* |
| 1972 | * Do this after blk_queue_make_request() overrides it... |
| 1973 | */ |
| 1974 | q->nr_requests = set->queue_depth; |
| 1975 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1976 | if (set->ops->complete) |
| 1977 | blk_queue_softirq_done(q, set->ops->complete); |
Christoph Hellwig | 30a91cb | 2014-02-10 03:24:38 -0800 | [diff] [blame] | 1978 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1979 | blk_mq_init_cpu_queues(q, set->nr_hw_queues); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1980 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1981 | if (blk_mq_init_hw_queues(q, set)) |
Mike Snitzer | 9a30b09 | 2015-03-12 23:53:26 -0400 | [diff] [blame] | 1982 | goto err_mq_usage; |
Christoph Hellwig | 1874198 | 2014-02-10 09:29:00 -0700 | [diff] [blame] | 1983 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1984 | mutex_lock(&all_q_mutex); |
| 1985 | list_add_tail(&q->all_q_node, &all_q_list); |
| 1986 | mutex_unlock(&all_q_mutex); |
| 1987 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 1988 | blk_mq_add_queue_tag_set(set, q); |
| 1989 | |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 1990 | blk_mq_map_swqueue(q); |
| 1991 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1992 | return q; |
Christoph Hellwig | 1874198 | 2014-02-10 09:29:00 -0700 | [diff] [blame] | 1993 | |
Mike Snitzer | 9a30b09 | 2015-03-12 23:53:26 -0400 | [diff] [blame] | 1994 | err_mq_usage: |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1995 | blk_cleanup_queue(q); |
| 1996 | err_hctxs: |
Jens Axboe | f14bbe7 | 2014-05-27 12:06:53 -0600 | [diff] [blame] | 1997 | kfree(map); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 1998 | for (i = 0; i < set->nr_hw_queues; i++) { |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1999 | if (!hctxs[i]) |
| 2000 | break; |
Jens Axboe | e4043dc | 2014-04-09 10:18:23 -0600 | [diff] [blame] | 2001 | free_cpumask_var(hctxs[i]->cpumask); |
Christoph Hellwig | cdef54d | 2014-05-28 18:11:06 +0200 | [diff] [blame] | 2002 | kfree(hctxs[i]); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2003 | } |
Jens Axboe | f14bbe7 | 2014-05-27 12:06:53 -0600 | [diff] [blame] | 2004 | err_map: |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2005 | kfree(hctxs); |
| 2006 | err_percpu: |
| 2007 | free_percpu(ctx); |
| 2008 | return ERR_PTR(-ENOMEM); |
| 2009 | } |
| 2010 | EXPORT_SYMBOL(blk_mq_init_queue); |
| 2011 | |
| 2012 | void blk_mq_free_queue(struct request_queue *q) |
| 2013 | { |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 2014 | struct blk_mq_tag_set *set = q->tag_set; |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2015 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 2016 | blk_mq_del_queue_tag_set(q); |
| 2017 | |
Ming Lei | 624dbe4 | 2014-05-27 23:35:13 +0800 | [diff] [blame] | 2018 | blk_mq_exit_hw_queues(q, set, set->nr_hw_queues); |
| 2019 | blk_mq_free_hw_queues(q, set); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2020 | |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 2021 | percpu_ref_exit(&q->mq_usage_counter); |
Ming Lei | 3d2936f | 2014-05-27 23:35:14 +0800 | [diff] [blame] | 2022 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2023 | kfree(q->mq_map); |
| 2024 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2025 | q->mq_map = NULL; |
| 2026 | |
| 2027 | mutex_lock(&all_q_mutex); |
| 2028 | list_del_init(&q->all_q_node); |
| 2029 | mutex_unlock(&all_q_mutex); |
| 2030 | } |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2031 | |
| 2032 | /* Basically redo blk_mq_init_queue with queue frozen */ |
Paul Gortmaker | f618ef7 | 2013-11-14 08:26:02 -0700 | [diff] [blame] | 2033 | static void blk_mq_queue_reinit(struct request_queue *q) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2034 | { |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 2035 | WARN_ON_ONCE(!q->mq_freeze_depth); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2036 | |
Jens Axboe | 67aec14 | 2014-05-30 08:25:36 -0600 | [diff] [blame] | 2037 | blk_mq_sysfs_unregister(q); |
| 2038 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2039 | blk_mq_update_queue_map(q->mq_map, q->nr_hw_queues); |
| 2040 | |
| 2041 | /* |
| 2042 | * redo blk_mq_init_cpu_queues and blk_mq_init_hw_queues. FIXME: maybe |
| 2043 | * we should change hctx numa_node according to new topology (this |
| 2044 | * involves free and re-allocate memory, worthy doing?) |
| 2045 | */ |
| 2046 | |
| 2047 | blk_mq_map_swqueue(q); |
| 2048 | |
Jens Axboe | 67aec14 | 2014-05-30 08:25:36 -0600 | [diff] [blame] | 2049 | blk_mq_sysfs_register(q); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2050 | } |
| 2051 | |
Paul Gortmaker | f618ef7 | 2013-11-14 08:26:02 -0700 | [diff] [blame] | 2052 | static int blk_mq_queue_reinit_notify(struct notifier_block *nb, |
| 2053 | unsigned long action, void *hcpu) |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2054 | { |
| 2055 | struct request_queue *q; |
| 2056 | |
| 2057 | /* |
Jens Axboe | 9fccfed | 2014-05-08 14:50:19 -0600 | [diff] [blame] | 2058 | * Before new mappings are established, hotadded cpu might already |
| 2059 | * start handling requests. This doesn't break anything as we map |
| 2060 | * offline CPUs to first hardware queue. We will re-init the queue |
| 2061 | * below to get optimal settings. |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2062 | */ |
| 2063 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN && |
| 2064 | action != CPU_ONLINE && action != CPU_ONLINE_FROZEN) |
| 2065 | return NOTIFY_OK; |
| 2066 | |
| 2067 | mutex_lock(&all_q_mutex); |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 2068 | |
| 2069 | /* |
| 2070 | * We need to freeze and reinit all existing queues. Freezing |
| 2071 | * involves synchronous wait for an RCU grace period and doing it |
| 2072 | * one by one may take a long time. Start freezing all queues in |
| 2073 | * one swoop and then wait for the completions so that freezing can |
| 2074 | * take place in parallel. |
| 2075 | */ |
| 2076 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 2077 | blk_mq_freeze_queue_start(q); |
| 2078 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 2079 | blk_mq_freeze_queue_wait(q); |
| 2080 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2081 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 2082 | blk_mq_queue_reinit(q); |
Tejun Heo | f3af020 | 2014-11-04 13:52:27 -0500 | [diff] [blame] | 2083 | |
| 2084 | list_for_each_entry(q, &all_q_list, all_q_node) |
| 2085 | blk_mq_unfreeze_queue(q); |
| 2086 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2087 | mutex_unlock(&all_q_mutex); |
| 2088 | return NOTIFY_OK; |
| 2089 | } |
| 2090 | |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 2091 | static int __blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) |
| 2092 | { |
| 2093 | int i; |
| 2094 | |
| 2095 | for (i = 0; i < set->nr_hw_queues; i++) { |
| 2096 | set->tags[i] = blk_mq_init_rq_map(set, i); |
| 2097 | if (!set->tags[i]) |
| 2098 | goto out_unwind; |
| 2099 | } |
| 2100 | |
| 2101 | return 0; |
| 2102 | |
| 2103 | out_unwind: |
| 2104 | while (--i >= 0) |
| 2105 | blk_mq_free_rq_map(set, set->tags[i], i); |
| 2106 | |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 2107 | return -ENOMEM; |
| 2108 | } |
| 2109 | |
| 2110 | /* |
| 2111 | * Allocate the request maps associated with this tag_set. Note that this |
| 2112 | * may reduce the depth asked for, if memory is tight. set->queue_depth |
| 2113 | * will be updated to reflect the allocated depth. |
| 2114 | */ |
| 2115 | static int blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) |
| 2116 | { |
| 2117 | unsigned int depth; |
| 2118 | int err; |
| 2119 | |
| 2120 | depth = set->queue_depth; |
| 2121 | do { |
| 2122 | err = __blk_mq_alloc_rq_maps(set); |
| 2123 | if (!err) |
| 2124 | break; |
| 2125 | |
| 2126 | set->queue_depth >>= 1; |
| 2127 | if (set->queue_depth < set->reserved_tags + BLK_MQ_TAG_MIN) { |
| 2128 | err = -ENOMEM; |
| 2129 | break; |
| 2130 | } |
| 2131 | } while (set->queue_depth); |
| 2132 | |
| 2133 | if (!set->queue_depth || err) { |
| 2134 | pr_err("blk-mq: failed to allocate request map\n"); |
| 2135 | return -ENOMEM; |
| 2136 | } |
| 2137 | |
| 2138 | if (depth != set->queue_depth) |
| 2139 | pr_info("blk-mq: reduced tag depth (%u -> %u)\n", |
| 2140 | depth, set->queue_depth); |
| 2141 | |
| 2142 | return 0; |
| 2143 | } |
| 2144 | |
Jens Axboe | a4391c6 | 2014-06-05 15:21:56 -0600 | [diff] [blame] | 2145 | /* |
| 2146 | * Alloc a tag set to be associated with one or more request queues. |
| 2147 | * May fail with EINVAL for various error conditions. May adjust the |
| 2148 | * requested depth down, if if it too large. In that case, the set |
| 2149 | * value will be stored in set->queue_depth. |
| 2150 | */ |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2151 | int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) |
| 2152 | { |
Bart Van Assche | 205fb5f | 2014-10-30 14:45:11 +0100 | [diff] [blame] | 2153 | BUILD_BUG_ON(BLK_MQ_MAX_DEPTH > 1 << BLK_MQ_UNIQUE_TAG_BITS); |
| 2154 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2155 | if (!set->nr_hw_queues) |
| 2156 | return -EINVAL; |
Jens Axboe | a4391c6 | 2014-06-05 15:21:56 -0600 | [diff] [blame] | 2157 | if (!set->queue_depth) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2158 | return -EINVAL; |
| 2159 | if (set->queue_depth < set->reserved_tags + BLK_MQ_TAG_MIN) |
| 2160 | return -EINVAL; |
| 2161 | |
Christoph Hellwig | cdef54d | 2014-05-28 18:11:06 +0200 | [diff] [blame] | 2162 | if (!set->nr_hw_queues || !set->ops->queue_rq || !set->ops->map_queue) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2163 | return -EINVAL; |
| 2164 | |
Jens Axboe | a4391c6 | 2014-06-05 15:21:56 -0600 | [diff] [blame] | 2165 | if (set->queue_depth > BLK_MQ_MAX_DEPTH) { |
| 2166 | pr_info("blk-mq: reduced tag depth to %u\n", |
| 2167 | BLK_MQ_MAX_DEPTH); |
| 2168 | set->queue_depth = BLK_MQ_MAX_DEPTH; |
| 2169 | } |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2170 | |
Shaohua Li | 6637fad | 2014-11-30 16:00:58 -0800 | [diff] [blame] | 2171 | /* |
| 2172 | * If a crashdump is active, then we are potentially in a very |
| 2173 | * memory constrained environment. Limit us to 1 queue and |
| 2174 | * 64 tags to prevent using too much memory. |
| 2175 | */ |
| 2176 | if (is_kdump_kernel()) { |
| 2177 | set->nr_hw_queues = 1; |
| 2178 | set->queue_depth = min(64U, set->queue_depth); |
| 2179 | } |
| 2180 | |
Ming Lei | 4847900 | 2014-04-19 18:00:17 +0800 | [diff] [blame] | 2181 | set->tags = kmalloc_node(set->nr_hw_queues * |
| 2182 | sizeof(struct blk_mq_tags *), |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2183 | GFP_KERNEL, set->numa_node); |
| 2184 | if (!set->tags) |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 2185 | return -ENOMEM; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2186 | |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 2187 | if (blk_mq_alloc_rq_maps(set)) |
| 2188 | goto enomem; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2189 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 2190 | mutex_init(&set->tag_list_lock); |
| 2191 | INIT_LIST_HEAD(&set->tag_list); |
| 2192 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2193 | return 0; |
Jens Axboe | a516440 | 2014-09-10 09:02:03 -0600 | [diff] [blame] | 2194 | enomem: |
Robert Elliott | 5676e7b | 2014-09-02 11:38:44 -0500 | [diff] [blame] | 2195 | kfree(set->tags); |
| 2196 | set->tags = NULL; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2197 | return -ENOMEM; |
| 2198 | } |
| 2199 | EXPORT_SYMBOL(blk_mq_alloc_tag_set); |
| 2200 | |
| 2201 | void blk_mq_free_tag_set(struct blk_mq_tag_set *set) |
| 2202 | { |
| 2203 | int i; |
| 2204 | |
Jens Axboe | 484b406 | 2014-05-21 14:01:15 -0600 | [diff] [blame] | 2205 | for (i = 0; i < set->nr_hw_queues; i++) { |
| 2206 | if (set->tags[i]) |
| 2207 | blk_mq_free_rq_map(set, set->tags[i], i); |
| 2208 | } |
| 2209 | |
Ming Lei | 981bd18 | 2014-04-24 00:07:34 +0800 | [diff] [blame] | 2210 | kfree(set->tags); |
Robert Elliott | 5676e7b | 2014-09-02 11:38:44 -0500 | [diff] [blame] | 2211 | set->tags = NULL; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 2212 | } |
| 2213 | EXPORT_SYMBOL(blk_mq_free_tag_set); |
| 2214 | |
Jens Axboe | e3a2b3f | 2014-05-20 11:49:02 -0600 | [diff] [blame] | 2215 | int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) |
| 2216 | { |
| 2217 | struct blk_mq_tag_set *set = q->tag_set; |
| 2218 | struct blk_mq_hw_ctx *hctx; |
| 2219 | int i, ret; |
| 2220 | |
| 2221 | if (!set || nr > set->queue_depth) |
| 2222 | return -EINVAL; |
| 2223 | |
| 2224 | ret = 0; |
| 2225 | queue_for_each_hw_ctx(q, hctx, i) { |
| 2226 | ret = blk_mq_tag_update_depth(hctx->tags, nr); |
| 2227 | if (ret) |
| 2228 | break; |
| 2229 | } |
| 2230 | |
| 2231 | if (!ret) |
| 2232 | q->nr_requests = nr; |
| 2233 | |
| 2234 | return ret; |
| 2235 | } |
| 2236 | |
Jens Axboe | 676141e | 2014-03-20 13:29:18 -0600 | [diff] [blame] | 2237 | void blk_mq_disable_hotplug(void) |
| 2238 | { |
| 2239 | mutex_lock(&all_q_mutex); |
| 2240 | } |
| 2241 | |
| 2242 | void blk_mq_enable_hotplug(void) |
| 2243 | { |
| 2244 | mutex_unlock(&all_q_mutex); |
| 2245 | } |
| 2246 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2247 | static int __init blk_mq_init(void) |
| 2248 | { |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2249 | blk_mq_cpu_init(); |
| 2250 | |
Tejun Heo | add703f | 2014-07-01 10:34:38 -0600 | [diff] [blame] | 2251 | hotcpu_notifier(blk_mq_queue_reinit_notify, 0); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 2252 | |
| 2253 | return 0; |
| 2254 | } |
| 2255 | subsys_initcall(blk_mq_init); |