cregit-Linux how code gets into the kernel

Release 4.13 block/blk-mq.c

Directory: block
/*
 * Block multiqueue core code
 *
 * Copyright (C) 2013-2014 Jens Axboe
 * Copyright (C) 2013-2014 Christoph Hellwig
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/backing-dev.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/kmemleak.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/smp.h>
#include <linux/llist.h>
#include <linux/list_sort.h>
#include <linux/cpu.h>
#include <linux/cache.h>
#include <linux/sched/sysctl.h>
#include <linux/sched/topology.h>
#include <linux/sched/signal.h>
#include <linux/delay.h>
#include <linux/crash_dump.h>
#include <linux/prefetch.h>

#include <trace/events/block.h>

#include <linux/blk-mq.h>
#include "blk.h"
#include "blk-mq.h"
#include "blk-mq-debugfs.h"
#include "blk-mq-tag.h"
#include "blk-stat.h"
#include "blk-wbt.h"
#include "blk-mq-sched.h"

static void blk_mq_poll_stats_start(struct request_queue *q);
static void blk_mq_poll_stats_fn(struct blk_stat_callback *cb);


static int blk_mq_poll_stats_bkt(const struct request *rq) { int ddir, bytes, bucket; ddir = rq_data_dir(rq); bytes = blk_rq_bytes(rq); bucket = ddir + 2*(ilog2(bytes) - 9); if (bucket < 0) return -1; else if (bucket >= BLK_MQ_POLL_STATS_BKTS) return ddir + BLK_MQ_POLL_STATS_BKTS - 2; return bucket; }

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Jens Axboe11.33%150.00%
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/* * Check if any of the ctx's have pending work in this hardware queue */
bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx) { return sbitmap_any_bit_set(&hctx->ctx_map) || !list_empty_careful(&hctx->dispatch) || blk_mq_sched_has_work(hctx); }

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Omar Sandoval39.09%125.00%
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/* * Mark this ctx as having pending work in this hardware queue */
static void blk_mq_hctx_mark_pending(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx) { if (!sbitmap_test_bit(&hctx->ctx_map, ctx->index_hw)) sbitmap_set_bit(&hctx->ctx_map, ctx->index_hw); }

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Jens Axboe3376.74%266.67%
Omar Sandoval1023.26%133.33%
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static void blk_mq_hctx_clear_pending(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx) { sbitmap_clear_bit(&hctx->ctx_map, ctx->index_hw); }

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void blk_freeze_queue_start(struct request_queue *q) { int freeze_depth; freeze_depth = atomic_inc_return(&q->mq_freeze_depth); if (freeze_depth == 1) { percpu_ref_kill(&q->q_usage_counter); blk_mq_run_hw_queues(q, false); } }

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Jens Axboe1736.96%110.00%
Tejun Heo1532.61%550.00%
Christoph Hellwig919.57%110.00%
Mike Snitzer36.52%110.00%
Lei Ming12.17%110.00%
Dan J Williams12.17%110.00%
Total46100.00%10100.00%

EXPORT_SYMBOL_GPL(blk_freeze_queue_start);
void blk_mq_freeze_queue_wait(struct request_queue *q) { wait_event(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter)); }

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Dan J Williams14.00%120.00%
Total25100.00%5100.00%

EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait);
int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, unsigned long timeout) { return wait_event_timeout(q->mq_freeze_wq, percpu_ref_is_zero(&q->q_usage_counter), timeout); }

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EXPORT_SYMBOL_GPL(blk_mq_freeze_queue_wait_timeout); /* * Guarantee no request is in use, so we can change any data structure of * the queue afterward. */
void blk_freeze_queue(struct request_queue *q) { /* * In the !blk_mq case we are only calling this to kill the * q_usage_counter, otherwise this increases the freeze depth * and waits for it to return to zero. For this reason there is * no blk_unfreeze_queue(), and blk_freeze_queue() is not * exported to drivers as the only user for unfreeze is blk_mq. */ blk_freeze_queue_start(q); blk_mq_freeze_queue_wait(q); }

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Dan J Williams29.52%133.33%
Lei Ming14.76%133.33%
Total21100.00%3100.00%


void blk_mq_freeze_queue(struct request_queue *q) { /* * ...just an alias to keep freeze and unfreeze actions balanced * in the blk_mq_* namespace */ blk_freeze_queue(q); }

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EXPORT_SYMBOL_GPL(blk_mq_freeze_queue);
void blk_mq_unfreeze_queue(struct request_queue *q) { int freeze_depth; freeze_depth = atomic_dec_return(&q->mq_freeze_depth); WARN_ON_ONCE(freeze_depth < 0); if (!freeze_depth) { percpu_ref_reinit(&q->q_usage_counter); wake_up_all(&q->mq_freeze_wq); } }

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Jens Axboe3158.49%120.00%
Tejun Heo1120.75%240.00%
Christoph Hellwig1018.87%120.00%
Dan J Williams11.89%120.00%
Total53100.00%5100.00%

EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue); /* * FIXME: replace the scsi_internal_device_*block_nowait() calls in the * mpt3sas driver such that this function can be removed. */
void blk_mq_quiesce_queue_nowait(struct request_queue *q) { unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); queue_flag_set(QUEUE_FLAG_QUIESCED, q); spin_unlock_irqrestore(q->queue_lock, flags); }

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EXPORT_SYMBOL_GPL(blk_mq_quiesce_queue_nowait); /** * blk_mq_quiesce_queue() - wait until all ongoing dispatches have finished * @q: request queue. * * Note: this function does not prevent that the struct request end_io() * callback function is invoked. Once this function is returned, we make * sure no dispatch can happen until the queue is unquiesced via * blk_mq_unquiesce_queue(). */
void blk_mq_quiesce_queue(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; unsigned int i; bool rcu = false; blk_mq_quiesce_queue_nowait(q); queue_for_each_hw_ctx(q, hctx, i) { if (hctx->flags & BLK_MQ_F_BLOCKING) synchronize_srcu(hctx->queue_rq_srcu); else rcu = true; } if (rcu) synchronize_rcu(); }

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Bart Van Assche6192.42%133.33%
Ming Lei57.58%266.67%
Total66100.00%3100.00%

EXPORT_SYMBOL_GPL(blk_mq_quiesce_queue); /* * blk_mq_unquiesce_queue() - counterpart of blk_mq_quiesce_queue() * @q: request queue. * * This function recovers queue into the state before quiescing * which is done by blk_mq_quiesce_queue. */
void blk_mq_unquiesce_queue(struct request_queue *q) { unsigned long flags; spin_lock_irqsave(q->queue_lock, flags); queue_flag_clear(QUEUE_FLAG_QUIESCED, q); spin_unlock_irqrestore(q->queue_lock, flags); /* dispatch requests which are inserted during quiescing */ blk_mq_run_hw_queues(q, true); }

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Ming Lei3778.72%375.00%
Bart Van Assche1021.28%125.00%
Total47100.00%4100.00%

EXPORT_SYMBOL_GPL(blk_mq_unquiesce_queue);
void blk_mq_wake_waiters(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; unsigned int i; queue_for_each_hw_ctx(q, hctx, i) if (blk_mq_hw_queue_mapped(hctx)) blk_mq_tag_wakeup_all(hctx->tags, true); /* * If we are called because the queue has now been marked as * dying, we need to ensure that processes currently waiting on * the queue are notified as well. */ wake_up_all(&q->mq_freeze_wq); }

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Jens Axboe4382.69%150.00%
Keith Busch917.31%150.00%
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bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx) { return blk_mq_has_free_tags(hctx->tags); }

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EXPORT_SYMBOL(blk_mq_can_queue);
static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data, unsigned int tag, unsigned int op) { struct blk_mq_tags *tags = blk_mq_tags_from_data(data); struct request *rq = tags->static_rqs[tag]; rq->rq_flags = 0; if (data->flags & BLK_MQ_REQ_INTERNAL) { rq->tag = -1; rq->internal_tag = tag; } else { if (blk_mq_tag_busy(data->hctx)) { rq->rq_flags = RQF_MQ_INFLIGHT; atomic_inc(&data->hctx->nr_active); } rq->tag = tag; rq->internal_tag = -1; data->hctx->tags->rqs[rq->tag] = rq; } INIT_LIST_HEAD(&rq->queuelist); /* csd/requeue_work/fifo_time is initialized before use */ rq->q = data->q; rq->mq_ctx = data->ctx; rq->cmd_flags = op; if (blk_queue_io_stat(data->q)) rq->rq_flags |= RQF_IO_STAT; /* do not touch atomic flags, it needs atomic ops against the timer */ rq->cpu = -1; INIT_HLIST_NODE(&rq->hash); RB_CLEAR_NODE(&rq->rb_node); rq->rq_disk = NULL; rq->part = NULL; rq->start_time = jiffies; #ifdef CONFIG_BLK_CGROUP rq->rl = NULL; set_start_time_ns(rq); rq->io_start_time_ns = 0; #endif rq->nr_phys_segments = 0; #if defined(CONFIG_BLK_DEV_INTEGRITY) rq->nr_integrity_segments = 0; #endif rq->special = NULL; /* tag was already set */ rq->extra_len = 0; INIT_LIST_HEAD(&rq->timeout_list); rq->timeout = 0; rq->end_io = NULL; rq->end_io_data = NULL; rq->next_rq = NULL; data->ctx->rq_dispatched[op_is_sync(op)]++; return rq; }

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Christoph Hellwig26783.18%646.15%
Jens Axboe4112.77%430.77%
Bart Van Assche61.87%17.69%
Lei Ming51.56%17.69%
Michael Christie20.62%17.69%
Total321100.00%13100.00%


static struct request *blk_mq_get_request(struct request_queue *q, struct bio *bio, unsigned int op, struct blk_mq_alloc_data *data) { struct elevator_queue *e = q->elevator; struct request *rq; unsigned int tag; struct blk_mq_ctx *local_ctx = NULL; blk_queue_enter_live(q); data->q = q; if (likely(!data->ctx)) data->ctx = local_ctx = blk_mq_get_ctx(q); if (likely(!data->hctx)) data->hctx = blk_mq_map_queue(q, data->ctx->cpu); if (op & REQ_NOWAIT) data->flags |= BLK_MQ_REQ_NOWAIT; if (e) { data->flags |= BLK_MQ_REQ_INTERNAL; /* * Flush requests are special and go directly to the * dispatch list. */ if (!op_is_flush(op) && e->type->ops.mq.limit_depth) e->type->ops.mq.limit_depth(op, data); } tag = blk_mq_get_tag(data); if (tag == BLK_MQ_TAG_FAIL) { if (local_ctx) { blk_mq_put_ctx(local_ctx); data->ctx = NULL; } blk_queue_exit(q); return NULL; } rq = blk_mq_rq_ctx_init(data, tag, op); if (!op_is_flush(op)) { rq->elv.icq = NULL; if (e && e->type->ops.mq.prepare_request) { if (e->type->icq_cache && rq_ioc(bio)) blk_mq_sched_assign_ioc(rq, bio); e->type->ops.mq.prepare_request(rq, bio); rq->rq_flags |= RQF_ELVPRIV; } } data->hctx->queued++; return rq; }

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Christoph Hellwig26587.46%571.43%
Ming Lei268.58%114.29%
Goldwyn Rodrigues123.96%114.29%
Total303100.00%7100.00%


struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op, unsigned int flags) { struct blk_mq_alloc_data alloc_data = { .flags = flags }; struct request *rq; int ret; ret = blk_queue_enter(q, flags & BLK_MQ_REQ_NOWAIT); if (ret) return ERR_PTR(ret); rq = blk_mq_get_request(q, NULL, op, &alloc_data); blk_queue_exit(q); if (!rq) return ERR_PTR(-EWOULDBLOCK); blk_mq_put_ctx(alloc_data.ctx); rq->__data_len = 0; rq->__sector = (sector_t) -1; rq->bio = rq->biotail = NULL; return rq; }

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Christoph Hellwig4636.22%533.33%
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Joe Lawrence2015.75%16.67%
Ming Lei75.51%16.67%
Keith Busch64.72%213.33%
Lei Ming53.94%16.67%
Bart Van Assche32.36%16.67%
Dan J Williams10.79%16.67%
Total127100.00%15100.00%

EXPORT_SYMBOL(blk_mq_alloc_request);
struct request *blk_mq_alloc_request_hctx(struct request_queue *q, unsigned int op, unsigned int flags, unsigned int hctx_idx) { struct blk_mq_alloc_data alloc_data = { .flags = flags }; struct request *rq; unsigned int cpu; int ret; /* * If the tag allocator sleeps we could get an allocation for a * different hardware context. No need to complicate the low level * allocator for this for the rare use case of a command tied to * a specific queue. */ if (WARN_ON_ONCE(!(flags & BLK_MQ_REQ_NOWAIT))) return ERR_PTR(-EINVAL); if (hctx_idx >= q->nr_hw_queues) return ERR_PTR(-EIO); ret = blk_queue_enter(q, true); if (ret) return ERR_PTR(ret); /* * Check if the hardware context is actually mapped to anything. * If not tell the caller that it should skip this queue. */ alloc_data.hctx = q->queue_hw_ctx[hctx_idx]; if (!blk_mq_hw_queue_mapped(alloc_data.hctx)) { blk_queue_exit(q); return ERR_PTR(-EXDEV); } cpu = cpumask_first(alloc_data.hctx->cpumask); alloc_data.ctx = __blk_mq_get_ctx(q, cpu); rq = blk_mq_get_request(q, NULL, op, &alloc_data); blk_queue_exit(q); if (!rq) return ERR_PTR(-EWOULDBLOCK); return rq; }

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Ming Lin12062.18%116.67%
Omar Sandoval5126.42%116.67%
Christoph Hellwig147.25%233.33%
Keith Busch52.59%116.67%
Bart Van Assche31.55%116.67%
Total193100.00%6100.00%

EXPORT_SYMBOL_GPL(blk_mq_alloc_request_hctx);
void blk_mq_free_request(struct request *rq) { struct request_queue *q = rq->q; struct elevator_queue *e = q->elevator; struct blk_mq_ctx *ctx = rq->mq_ctx; struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu); const int sched_tag = rq->internal_tag; if (rq->rq_flags & RQF_ELVPRIV) { if (e && e->type->ops.mq.finish_request) e->type->ops.mq.finish_request(rq); if (rq->elv.icq) { put_io_context(rq->elv.icq->ioc); rq->elv.icq = NULL; } } ctx->rq_completed[rq_is_sync(rq)]++; if (rq->rq_flags & RQF_MQ_INFLIGHT) atomic_dec(&hctx->nr_active); wbt_done(q->rq_wb, &rq->issue_stat); clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags); clear_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags); if (rq->tag != -1) blk_mq_put_tag(hctx, hctx->tags, ctx, rq->tag); if (sched_tag != -1) blk_mq_put_tag(hctx, hctx->sched_tags, ctx, sched_tag); blk_mq_sched_restart(hctx); blk_queue_exit(q); }

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Christoph Hellwig12753.36%320.00%
Jens Axboe9941.60%853.33%
Omar Sandoval104.20%213.33%
Bart Van Assche10.42%16.67%
Dan J Williams10.42%16.67%
Total238100.00%15100.00%

EXPORT_SYMBOL_GPL(blk_mq_free_request);
inline void __blk_mq_end_request(struct request *rq, blk_status_t error) { blk_account_io_done(rq); if (rq->end_io) { wbt_done(rq->q->rq_wb, &rq->issue_stat); rq->end_io(rq, error); } else { if (unlikely(blk_bidi_rq(rq))) blk_mq_free_request(rq->next_rq); blk_mq_free_request(rq); } }

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Jens Axboe4560.00%228.57%
Christoph Hellwig2533.33%457.14%
Lei Ming56.67%114.29%
Total75100.00%7100.00%

EXPORT_SYMBOL(__blk_mq_end_request);
void blk_mq_end_request(struct request *rq, blk_status_t error) { if (blk_update_request(rq, error, blk_rq_bytes(rq))) BUG(); __blk_mq_end_request(rq, error); }

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EXPORT_SYMBOL(blk_mq_end_request);
static void __blk_mq_complete_request_remote(void *data) { struct request *rq = data; rq->q->softirq_done_fn(rq); }

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static void __blk_mq_complete_request(struct request *rq) { struct blk_mq_ctx *ctx = rq->mq_ctx; bool shared = false; int cpu; if (rq->internal_tag != -1) blk_mq_sched_completed_request(rq); if (rq->rq_flags & RQF_STATS) { blk_mq_poll_stats_start(rq->q); blk_stat_add(rq); } if (!test_bit(QUEUE_FLAG_SAME_COMP, &rq->q->queue_flags)) { rq->q->softirq_done_fn(rq); return; } cpu = get_cpu(); if (!test_bit(QUEUE_FLAG_SAME_FORCE, &rq->q->queue_flags)) shared = cpus_share_cache(cpu, ctx->cpu); if (cpu != ctx->cpu && !shared && cpu_online(ctx->cpu)) { rq->csd.func = __blk_mq_complete_request_remote; rq->csd.info = rq; rq->csd.flags = 0; smp_call_function_single_async(ctx->cpu, &rq->csd); } else { rq->q->softirq_done_fn(rq); } put_cpu(); }

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Christoph Hellwig13268.39%457.14%
Jens Axboe6031.09%228.57%
Frédéric Weisbecker10.52%114.29%
Total193100.00%7100.00%

/** * blk_mq_complete_request - end I/O on a request * @rq: the request being processed * * Description: * Ends all I/O on a request. It does not handle partial completions. * The actual completion happens out-of-order, through a IPI handler. **/
void blk_mq_complete_request(struct request *rq) { struct request_queue *q = rq->q; if (unlikely(blk_should_fake_timeout(q))) return; if (!blk_mark_rq_complete(rq)) __blk_mq_complete_request(rq); }

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Christoph Hellwig3479.07%150.00%
Jens Axboe920.93%150.00%
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EXPORT_SYMBOL(blk_mq_complete_request);
int blk_mq_request_started(struct request *rq) { return test_bit(REQ_ATOM_STARTED, &rq->atomic_flags); }

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Keith Busch21100.00%1100.00%
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EXPORT_SYMBOL_GPL(blk_mq_request_started);
void blk_mq_start_request(struct request *rq) { struct request_queue *q = rq->q; blk_mq_sched_started_request(rq); trace_block_rq_issue(q, rq); if (test_bit(QUEUE_FLAG_STATS, &q->queue_flags)) { blk_stat_set_issue(&rq->issue_stat, blk_rq_sectors(rq)); rq->rq_flags |= RQF_STATS; wbt_issue(q->rq_wb, &rq->issue_stat); } blk_add_timer(rq); /* * Ensure that ->deadline is visible before set the started * flag and clear the completed flag. */ smp_mb__before_atomic(); /* * Mark us as started and clear complete. Complete might have been * set if requeue raced with timeout, which then marked it as * complete. So be sure to clear complete again when we start * the request, otherwise we'll ignore the completion event. */ if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) set_bit(REQ_ATOM_STARTED, &rq->atomic_flags); if (test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); if (q->dma_drain_size && blk_rq_bytes(rq)) { /* * Make sure space for the drain appears. We know we can do * this because max_hw_segments has been adjusted to be one * fewer than the device can handle. */ rq->nr_phys_segments++; } }

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Jens Axboe12281.33%872.73%
Christoph Hellwig1912.67%19.09%
Shaohua Li64.00%19.09%
Lei Ming32.00%19.09%
Total150100.00%11100.00%

EXPORT_SYMBOL(blk_mq_start_request); /* * When we reach here because queue is busy, REQ_ATOM_COMPLETE * flag isn't set yet, so there may be race with timeout handler, * but given rq->deadline is just set in .queue_rq() under * this situation, the race won't be possible in reality because * rq->timeout should be set as big enough to cover the window * between blk_mq_start_request() called from .queue_rq() and * clearing REQ_ATOM_STARTED here. */
static void __blk_mq_requeue_request(struct request *rq) { struct request_queue *q = rq->q; trace_block_rq_requeue(q, rq); wbt_requeue(q->rq_wb, &rq->issue_stat); blk_mq_sched_requeue_request(rq); if (test_and_clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) { if (q->dma_drain_size && blk_rq_bytes(rq)) rq->nr_phys_segments--; } }

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Jens Axboe5168.92%350.00%
Christoph Hellwig2331.08%350.00%
Total74100.00%6100.00%


void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list) { __blk_mq_requeue_request(rq); BUG_ON(blk_queued_rq(rq)); blk_mq_add_to_requeue_list(rq, true, kick_requeue_list); }

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Christoph Hellwig3085.71%266.67%
Bart Van Assche514.29%133.33%
Total35100.00%3100.00%

EXPORT_SYMBOL(blk_mq_requeue_request);
static void blk_mq_requeue_work(struct work_struct *work) { struct request_queue *q = container_of(work, struct request_queue, requeue_work.work); LIST_HEAD(rq_list); struct request *rq, *next; unsigned long flags; spin_lock_irqsave(&q->requeue_lock, flags); list_splice_init(&q->requeue_list, &rq_list); spin_unlock_irqrestore(&q->requeue_lock, flags); list_for_each_entry_safe(rq, next, &rq_list, queuelist) { if (!(rq->rq_flags & RQF_SOFTBARRIER)) continue; rq->rq_flags &= ~RQF_SOFTBARRIER; list_del_init(&rq->queuelist); blk_mq_sched_insert_request(rq, true, false, false, true); } while (!list_empty(&rq_list)) { rq = list_entry(rq_list.next, struct request, queuelist); list_del_init(&rq->queuelist); blk_mq_sched_insert_request(rq, false, false, false, true); } blk_mq_run_hw_queues(q, false); }

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Christoph Hellwig17093.92%342.86%
Jens Axboe63.31%228.57%
Bart Van Assche31.66%114.29%
Mike Snitzer21.10%114.29%
Total181100.00%7100.00%


void blk_mq_add_to_requeue_list(struct request *rq, bool at_head, bool kick_requeue_list) { struct request_queue *q = rq->q; unsigned long flags; /* * We abuse this flag that is otherwise used by the I/O scheduler to * request head insertation from the workqueue. */ BUG_ON(rq->rq_flags & RQF_SOFTBARRIER); spin_lock_irqsave(&q->requeue_lock, flags); if (at_head) { rq->rq_flags |= RQF_SOFTBARRIER; list_add(&rq->queuelist, &q->requeue_list); } else { list_add_tail(&rq->queuelist, &q->requeue_list); } spin_unlock_irqrestore(&q->requeue_lock, flags); if (kick_requeue_list) blk_mq_kick_requeue_list(q); }

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Christoph Hellwig9788.99%375.00%
Bart Van Assche1211.01%125.00%
Total109100.00%4100.00%

EXPORT_SYMBOL(blk_mq_add_to_requeue_list);
void blk_mq_kick_requeue_list(struct request_queue *q) { kblockd_schedule_delayed_work(&q->requeue_work, 0); }

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Christoph Hellwig1785.00%150.00%
Mike Snitzer315.00%150.00%
Total20100.00%2100.00%

EXPORT_SYMBOL(blk_mq_kick_requeue_list);
void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs) { kblockd_mod_delayed_work_on(WORK_CPU_UNBOUND, &q->requeue_work, msecs_to_jiffies(msecs)); }

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Jens Axboe1448.28%133.33%
Mike Snitzer1241.38%133.33%
Bart Van Assche310.34%133.33%
Total29100.00%3100.00%

EXPORT_SYMBOL(blk_mq_delay_kick_requeue_list);
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag) { if (tag < tags->nr_tags) { prefetch(tags->rqs[tag]); return tags->rqs[tag]; } return NULL; }

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Jens Axboe2757.45%240.00%
Hannes Reinecke1123.40%120.00%
Christoph Hellwig817.02%120.00%
Ming Lei12.13%120.00%
Total47100.00%5100.00%

EXPORT_SYMBOL(blk_mq_tag_to_rq); struct blk_mq_timeout_data { unsigned long next; unsigned int next_set; };
void blk_mq_rq_timed_out(struct request *req, bool reserved) { const struct blk_mq_ops *ops = req->q->mq_ops; enum blk_eh_timer_return ret = BLK_EH_RESET_TIMER; /* * We know that complete is set at this point. If STARTED isn't set * anymore, then the request isn't active and the "timeout" should * just be ignored. This can happen due to the bitflag ordering. * Timeout first checks if STARTED is set, and if it is, assumes * the request is active. But if we race with completion, then * both flags will get cleared. So check here again, and ignore * a timeout event with a request that isn't active. */ if (!test_bit(REQ_ATOM_STARTED, &req->atomic_flags)) return; if (ops->timeout) ret = ops->timeout(req, reserved); switch (ret) { case BLK_EH_HANDLED: __blk_mq_complete_request(req); break; case BLK_EH_RESET_TIMER: blk_add_timer(req); blk_clear_rq_complete(req); break; case BLK_EH_NOT_HANDLED: break; default: printk(KERN_ERR "block: bad eh return: %d\n", ret); break; } }

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Christoph Hellwig6864.15%450.00%
Jens Axboe3835.85%450.00%
Total106100.00%8100.00%


static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx, struct request *rq, void *priv, bool reserved) { struct blk_mq_timeout_data *data = priv; if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) return; /* * The rq being checked may have been freed and reallocated * out already here, we avoid this race by checking rq->deadline * and REQ_ATOM_COMPLETE flag together: * * - if rq->deadline is observed as new value because of * reusing, the rq won't be timed out because of timing. * - if rq->deadline is observed as previous value, * REQ_ATOM_COMPLETE flag won't be cleared in reuse path * because we put a barrier between setting rq->deadline * and clearing the flag in blk_mq_start_request(), so * this rq won't be timed out too. */ if (time_after_eq(jiffies, rq->deadline)) { if (!blk_mark_rq_complete(rq)) blk_mq_rq_timed_out(rq, reserved); } else if (!data->next_set || time_after(data->next, rq->deadline)) { data->next = rq->deadline; data->next_set = 1; } }

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Christoph Hellwig6560.19%350.00%
Jens Axboe4238.89%233.33%
Lei Ming10.93%116.67%
Total108100.00%6100.00%


static void blk_mq_timeout_work(struct work_struct *work) { struct request_queue *q = container_of(work, struct request_queue, timeout_work); struct blk_mq_timeout_data data = { .next = 0, .next_set = 0, }; int i; /* A deadlock might occur if a request is stuck requiring a * timeout at the same time a queue freeze is waiting * completion, since the timeout code would not be able to * acquire the queue reference here. * * That's why we don't use blk_queue_enter here; instead, we use * percpu_ref_tryget directly, because we need to be able to * obtain a reference even in the short window between the queue * starting to freeze, by dropping the first reference in * blk_freeze_queue_start, and the moment the last request is * consumed, marked by the instant q_usage_counter reaches * zero. */ if (!percpu_ref_tryget(&q->q_usage_counter)) return; blk_mq_queue_tag_busy_iter(q, blk_mq_check_expired, &data); if (data.next_set) { data.next = blk_rq_timeout(round_jiffies_up(data.next)); mod_timer(&q->timeout, data.next); } else { struct blk_mq_hw_ctx *hctx; queue_for_each_hw_ctx(q, hctx, i) { /* the hctx may be unmapped, so check it here */ if (blk_mq_hw_queue_mapped(hctx)) blk_mq_tag_idle(hctx); } } blk_queue_exit(q); }

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Jens Axboe6647.83%225.00%
Christoph Hellwig5640.58%337.50%
Ming Lei107.25%112.50%
Gabriel Krisman Bertazi53.62%112.50%
Lei Ming10.72%112.50%
Total138100.00%8100.00%

struct flush_busy_ctx_data { struct blk_mq_hw_ctx *hctx; struct list_head *list; };
static bool flush_busy_ctx(struct sbitmap *sb, unsigned int bitnr, void *data) { struct flush_busy_ctx_data *flush_data = data; struct blk_mq_hw_ctx *hctx = flush_data->hctx; struct blk_mq_ctx *ctx = hctx->ctxs[bitnr]; sbitmap_clear_bit(sb, bitnr); spin_lock(&ctx->lock); list_splice_tail_init(&ctx->rq_list, flush_data->list); spin_unlock(&ctx->lock); return true; }

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Jens Axboe4755.29%150.00%
Omar Sandoval3844.71%150.00%
Total85100.00%2100.00%

/* * Process software queues that have been marked busy, splicing them * to the for-dispatch */
void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list) { struct flush_busy_ctx_data data = { .hctx = hctx, .list = list, }; sbitmap_for_each_set(&hctx->ctx_map, flush_busy_ctx, &data); }

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Omar Sandoval4193.18%133.33%
Jens Axboe36.82%266.67%
Total44100.00%3100.00%

EXPORT_SYMBOL_GPL(blk_mq_flush_busy_ctxs);
static inline unsigned int queued_to_index(unsigned int queued) { if (!queued) return 0; return min(BLK_MQ_MAX_DISPATCH_ORDER - 1, ilog2(queued) + 1); }

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Jens Axboe35100.00%2100.00%
Total35100.00%2100.00%


bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx, bool wait) { struct blk_mq_alloc_data data = { .q = rq->q, .hctx = blk_mq_map_queue(rq->q, rq->mq_ctx->cpu), .flags = wait ? 0 : BLK_MQ_REQ_NOWAIT, }; might_sleep_if(wait); if (rq->tag != -1) goto done; if (blk_mq_tag_is_reserved(data.hctx->sched_tags, rq->internal_tag)) data.flags |= BLK_MQ_REQ_RESERVED; rq->tag = blk_mq_get_tag(&data); if (rq->tag >= 0) { if (blk_mq_tag_busy(data.hctx)) { rq->rq_flags |= RQF_MQ_INFLIGHT; atomic_inc(&data.hctx->nr_active); } data.hctx->tags->rqs[rq->tag] = rq; } done: if (hctx) *hctx = data.hctx; return rq->tag != -1; }

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Jens Axboe13676.40%675.00%
Omar Sandoval2111.80%112.50%
Sagi Grimberg2111.80%112.50%
Total178100.00%8100.00%


static void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx, struct request *rq) { blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag); rq->tag = -1; if (rq->rq_flags & RQF_MQ_INFLIGHT) { rq->rq_flags &= ~RQF_MQ_INFLIGHT; atomic_dec(&hctx->nr_active); } }

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Jens Axboe65100.00%2100.00%
Total65100.00%2100.00%


static void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx, struct request *rq) { if (rq->tag == -1 || rq->internal_tag == -1) return; __blk_mq_put_driver_tag(hctx, rq); }

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Jens Axboe40100.00%1100.00%
Total40100.00%1100.00%


static void blk_mq_put_driver_tag(struct request *rq) { struct blk_mq_hw_ctx *hctx; if (rq->tag == -1 || rq->internal_tag == -1) return; hctx = blk_mq_map_queue(rq->q, rq->mq_ctx->cpu); __blk_mq_put_driver_tag(hctx, rq); }

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Jens Axboe55100.00%1100.00%
Total55100.00%1100.00%

/* * If we fail getting a driver tag because all the driver tags are already * assigned and on the dispatch list, BUT the first entry does not have a * tag, then we could deadlock. For that case, move entries with assigned * driver tags to the front, leaving the set of tagged requests in the * same order, and the untagged set in the same order. */
static bool reorder_tags_to_front(struct list_head *list) { struct request *rq, *tmp, *first = NULL; list_for_each_entry_safe_reverse(rq, tmp, list, queuelist) { if (rq == first) break; if (rq->tag != -1) { list_move(&rq->queuelist, list); if (!first) first = rq; } } return first != NULL; }

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Jens Axboe78100.00%1100.00%
Total78100.00%1100.00%


static int blk_mq_dispatch_wake(wait_queue_entry_t *wait, unsigned mode, int flags, void *key) { struct blk_mq_hw_ctx *hctx; hctx = container_of(wait, struct blk_mq_hw_ctx, dispatch_wait); list_del(&wait->entry); clear_bit_unlock(BLK_MQ_S_TAG_WAITING, &hctx->state); blk_mq_run_hw_queue(hctx, true); return 1; }

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Omar Sandoval6396.92%133.33%
Ingo Molnar23.08%266.67%
Total65100.00%3100.00%


static bool blk_mq_dispatch_wait_add(struct blk_mq_hw_ctx *hctx) { struct sbq_wait_state *ws; /* * The TAG_WAITING bit serves as a lock protecting hctx->dispatch_wait. * The thread which wins the race to grab this bit adds the hardware * queue to the wait queue. */ if (test_bit(BLK_MQ_S_TAG_WAITING, &hctx->state) || test_and_set_bit_lock(BLK_MQ_S_TAG_WAITING, &hctx->state)) return false; init_waitqueue_func_entry(&hctx->dispatch_wait, blk_mq_dispatch_wake); ws = bt_wait_ptr(&hctx->tags->bitmap_tags, hctx); /* * As soon as this returns, it's no longer safe to fiddle with * hctx->dispatch_wait, since a completion can wake up the wait queue * and unlock the bit. */ add_wait_queue(&ws->wait, &hctx->dispatch_wait); return true; }

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Omar Sandoval83100.00%1100.00%
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bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list) { struct blk_mq_hw_ctx *hctx; struct request *rq; int errors, queued; if (list_empty(list)) return false; /* * Now process all the entries, sending them to the driver. */ errors = queued = 0; do { struct blk_mq_queue_data bd; blk_status_t ret; rq = list_first_entry(list, struct request, queuelist); if (!blk_mq_get_driver_tag(rq, &hctx, false)) { if (!queued && reorder_tags_to_front(list)) continue; /* * The initial allocation attempt failed, so we need to * rerun the hardware queue when a tag is freed. */ if (!blk_mq_dispatch_wait_add(hctx)) break; /* * It's possible that a tag was freed in the window * between the allocation failure and adding the * hardware queue to the wait queue. */ if (!blk_mq_get_driver_tag(rq, &hctx, false)) break; } list_del_init(&rq->queuelist); bd.rq = rq; /* * Flag last if we have no more requests, or if we have more * but can't assign a driver tag to it. */ if (list_empty(list)) bd.last = true; else { struct request *nxt; nxt = list_first_entry(list, struct request, queuelist); bd.last = !blk_mq_get_driver_tag(nxt, NULL, false); } ret = q->mq_ops->queue_rq(hctx, &bd); if (ret == BLK_STS_RESOURCE) { blk_mq_put_driver_tag_hctx(hctx, rq); list_add(&rq->queuelist, list); __blk_mq_requeue_request(rq); break; } if (unlikely(ret != BLK_STS_OK)) { errors++; blk_mq_end_request(rq, BLK_STS_IOERR); continue; } queued++; } while (!list_empty(list)); hctx->dispatched[queued_to_index(queued)]++; /* * Any items that need requeuing? Stuff them into hctx->dispatch, * that is where we will continue on next queue run. */ if (!list_empty(list)) { /* * If an I/O scheduler has been configured and we got a driver * tag for the next request already, free it again. */ rq = list_first_entry(list, struct request, queuelist); blk_mq_put_driver_tag(rq); spin_lock(&hctx->lock); list_splice_init(list, &hctx->dispatch); spin_unlock(&hctx->lock); /* * If SCHED_RESTART was set by the caller of this function and * it is no longer set that means that it was cleared by another * thread and hence that a queue rerun is needed. * * If TAG_WAITING is set that means that an I/O scheduler has * been configured and another thread is waiting for a driver * tag. To guarantee fairness, do not rerun this hardware queue * but let the other thread grab the driver tag. * * If no I/O scheduler has been configured it is possible that * the hardware queue got stopped and restarted before requests * were pushed back onto the dispatch list. Rerun the queue to * avoid starvation. Notes: * - blk_mq_run_hw_queue() checks whether or not a queue has * been stopped before rerunning a queue. * - Some but not all block drivers stop a queue before * returning BLK_STS_RESOURCE. Two exceptions are scsi-mq * and dm-rq. */ if (!blk_mq_sched_needs_restart(hctx) && !test_bit(BLK_MQ_S_TAG_WAITING, &hctx->state)) blk_mq_run_hw_queue(hctx, true); } return (queued + errors) != 0; }

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Jens Axboe29781.82%1257.14%
Omar Sandoval4211.57%314.29%
Christoph Hellwig236.34%523.81%
Bart Van Assche10.28%14.76%
Total363100.00%21100.00%


static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx) { int srcu_idx; WARN_ON(!cpumask_test_cpu(raw_smp_processor_id(), hctx->cpumask) && cpu_online(hctx->next_cpu)); if (!(hctx->flags & BLK_MQ_F_BLOCKING)) { rcu_read_lock(); blk_mq_sched_dispatch_requests(hctx); rcu_read_unlock(); } else { might_sleep(); srcu_idx = srcu_read_lock(hctx->queue_rq_srcu); blk_mq_sched_dispatch_requests(hctx); srcu_read_unlock(hctx->queue_rq_srcu, srcu_idx); } }

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Bart Van Assche8394.32%133.33%
Jens Axboe55.68%266.67%
Total88100.00%3100.00%

/* * It'd be great if the workqueue API had a way to pass * in a mask and had some smarts for more clever placement. * For now we just round-robin here, switching for every * BLK_MQ_CPU_WORK_BATCH queued items. */
static int blk_mq_hctx_next_cpu(struct blk_mq_hw_ctx *hctx) { if (hctx->queue->nr_hw_queues == 1) return WORK_CPU_UNBOUND; if (--hctx->next_cpu_batch <= 0) { int next_cpu; next_cpu = cpumask_next(hctx->next_cpu, hctx->cpumask); if (next_cpu >= nr_cpu_ids) next_cpu = cpumask_first(hctx->cpumask); hctx->next_cpu = next_cpu; hctx->next_cpu_batch = BLK_MQ_CPU_WORK_BATCH; } return hctx->next_cpu; }

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Jens Axboe6679.52%150.00%
Christoph Hellwig1720.48%150.00%
Total83100.00%2100.00%


static void __blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async, unsigned long msecs) { if (WARN_ON_ONCE(!blk_mq_hw_queue_mapped(hctx))) return; if (unlikely(blk_mq_hctx_stopped(hctx))) return; if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) { int cpu = get_cpu(); if (cpumask_test_cpu(cpu, hctx->cpumask)) { __blk_mq_run_hw_queue(hctx); put_cpu(); return; } put_cpu(); } kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work, msecs_to_jiffies(msecs)); }

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Jens Axboe4845.28%444.44%
Bart Van Assche3533.02%222.22%
Paolo Bonzini2018.87%222.22%
Ming Lei32.83%111.11%
Total106100.00%9100.00%


void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs) { __blk_mq_delay_run_hw_queue(hctx, true, msecs); }

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Bart Van Assche23100.00%1100.00%
Total23100.00%1100.00%

EXPORT_SYMBOL(blk_mq_delay_run_hw_queue);
void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) { __blk_mq_delay_run_hw_queue(hctx, async, 0); }

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Bart Van Assche2195.45%150.00%
Jens Axboe14.55%150.00%
Total22100.00%2100.00%

EXPORT_SYMBOL(blk_mq_run_hw_queue);
void blk_mq_run_hw_queues(struct request_queue *q, bool async) { struct blk_mq_hw_ctx *hctx; int i; queue_for_each_hw_ctx(q, hctx, i) { if (!blk_mq_hctx_has_pending(hctx) || blk_mq_hctx_stopped(hctx)) continue; blk_mq_run_hw_queue(hctx, async); } }

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Jens Axboe4688.46%133.33%
Mike Snitzer59.62%133.33%
Bart Van Assche11.92%133.33%
Total52100.00%3100.00%

EXPORT_SYMBOL(blk_mq_run_hw_queues); /** * blk_mq_queue_stopped() - check whether one or more hctxs have been stopped * @q: request queue. * * The caller is responsible for serializing this function against * blk_mq_{start,stop}_hw_queue(). */
bool blk_mq_queue_stopped(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; queue_for_each_hw_ctx(q, hctx, i) if (blk_mq_hctx_stopped(hctx)) return true; return false; }

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Bart Van Assche39100.00%1100.00%
Total39100.00%1100.00%

EXPORT_SYMBOL(blk_mq_queue_stopped); /* * This function is often used for pausing .queue_rq() by driver when * there isn't enough resource or some conditions aren't satisfied, and * BLK_MQ_RQ_QUEUE_BUSY is usually returned. * * We do not guarantee that dispatch can be drained or blocked * after blk_mq_stop_hw_queue() returns. Please use * blk_mq_quiesce_queue() for that requirement. */
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx) { cancel_delayed_work(&hctx->run_work); set_bit(BLK_MQ_S_STOPPED, &hctx->state); }

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Jens Axboe2796.43%266.67%
Ming Lei13.57%133.33%
Total28100.00%3100.00%

EXPORT_SYMBOL(blk_mq_stop_hw_queue); /* * This function is often used for pausing .queue_rq() by driver when * there isn't enough resource or some conditions aren't satisfied, and * BLK_MQ_RQ_QUEUE_BUSY is usually returned. * * We do not guarantee that dispatch can be drained or blocked * after blk_mq_stop_hw_queues() returns. Please use * blk_mq_quiesce_queue() for that requirement. */
void blk_mq_stop_hw_queues(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; queue_for_each_hw_ctx(q, hctx, i) blk_mq_stop_hw_queue(hctx); }

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Christoph Hellwig2993.55%150.00%
Ming Lei26.45%150.00%
Total31100.00%2100.00%

EXPORT_SYMBOL(blk_mq_stop_hw_queues);
void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx) { clear_bit(BLK_MQ_S_STOPPED, &hctx->state); blk_mq_run_hw_queue(hctx, false); }

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Jens Axboe27100.00%2100.00%
Total27100.00%2100.00%

EXPORT_SYMBOL(blk_mq_start_hw_queue);
void blk_mq_start_hw_queues(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; int i; queue_for_each_hw_ctx(q, hctx, i) blk_mq_start_hw_queue(hctx); }

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Christoph Hellwig31100.00%1100.00%
Total31100.00%1100.00%

EXPORT_SYMBOL(blk_mq_start_hw_queues);
void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) { if (!blk_mq_hctx_stopped(hctx)) return; clear_bit(BLK_MQ_S_STOPPED, &hctx->state); blk_mq_run_hw_queue(hctx, async); }

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Jens Axboe3487.18%250.00%
Christoph Hellwig410.26%125.00%
Bart Van Assche12.56%125.00%
Total39100.00%4100.00%

EXPORT_SYMBOL_GPL(blk_mq_start_stopped_hw_queue);
void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async) { struct blk_mq_hw_ctx *hctx; int i; queue_for_each_hw_ctx(q, hctx, i) blk_mq_start_stopped_hw_queue(hctx, async); }

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Jens Axboe36100.00%2100.00%
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EXPORT_SYMBOL(blk_mq_start_stopped_hw_queues);
static void blk_mq_run_work_fn(struct work_struct *work) { struct blk_mq_hw_ctx *hctx; hctx = container_of(work, struct blk_mq_hw_ctx, run_work.work); /* * If we are stopped, don't run the queue. The exception is if * BLK_MQ_S_START_ON_RUN is set. For that case, we auto-clear * the STOPPED bit and run it. */ if (test_bit(BLK_MQ_S_STOPPED, &hctx->state)) { if (!test_bit(BLK_MQ_S_START_ON_RUN, &hctx->state)) return; clear_bit(BLK_MQ_S_START_ON_RUN, &hctx->state); clear_bit(BLK_MQ_S_STOPPED, &hctx->state); } __blk_mq_run_hw_queue(hctx); }

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Jens Axboe3946.43%250.00%
Christoph Hellwig3845.24%125.00%
Bart Van Assche78.33%125.00%
Total84100.00%4100.00%


void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs) { if (WARN_ON_ONCE(!blk_mq_hw_queue_mapped(hctx))) return; /* * Stop the hw queue, then modify currently delayed work. * This should prevent us from running the queue prematurely. * Mark the queue as auto-clearing STOPPED when it runs. */ blk_mq_stop_hw_queue(hctx); set_bit(BLK_MQ_S_START_ON_RUN, &hctx->state); kblockd_mod_delayed_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work, msecs_to_jiffies(msecs)); }

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Christoph Hellwig3456.67%228.57%
Jens Axboe1931.67%342.86%
Ming Lei610.00%114.29%
Bart Van Assche11.67%114.29%
Total60100.00%7100.00%

EXPORT_SYMBOL(blk_mq_delay_queue);
static inline void __blk_mq_insert_req_list(struct blk_mq_hw_ctx *hctx, struct request *rq, bool at_head) { struct blk_mq_ctx *ctx = rq->mq_ctx; lockdep_assert_held(&ctx->lock); trace_block_rq_insert(hctx->queue, rq); if (at_head) list_add(&rq->queuelist, &ctx->rq_list); else list_add_tail(&rq->queuelist, &ctx->rq_list); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe4558.44%350.00%
Christoph Hellwig2127.27%116.67%
Bart Van Assche810.39%116.67%
Ming Lei33.90%116.67%
Total77100.00%6100.00%


void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, bool at_head) { struct blk_mq_ctx *ctx = rq->mq_ctx; lockdep_assert_held(&ctx->lock); __blk_mq_insert_req_list(hctx, rq, at_head); blk_mq_hctx_mark_pending(hctx, ctx); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe2752.94%342.86%
Ming Lei1427.45%114.29%
Bart Van Assche815.69%114.29%
Christoph Hellwig23.92%228.57%
Total51100.00%7100.00%


void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, struct list_head *list) { /* * preemption doesn't flush plug list, so it's possible ctx->cpu is * offline now */ spin_lock(&ctx->lock); while (!list_empty(list)) { struct request *rq; rq = list_first_entry(list, struct request, queuelist); BUG_ON(rq->mq_ctx != ctx); list_del_init(&rq->queuelist); __blk_mq_insert_req_list(hctx, rq, false); } blk_mq_hctx_mark_pending(hctx, ctx); spin_unlock(&ctx->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe8789.69%360.00%
Ming Lei88.25%120.00%
Christoph Hellwig22.06%120.00%
Total97100.00%5100.00%


static int plug_ctx_cmp(void *priv, struct list_head *a, struct list_head *b) { struct request *rqa = container_of(a, struct request, queuelist); struct request *rqb = container_of(b, struct request, queuelist); return !(rqa->mq_ctx < rqb->mq_ctx || (rqa->mq_ctx == rqb->mq_ctx && blk_rq_pos(rqa) < blk_rq_pos(rqb))); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe82100.00%1100.00%
Total82100.00%1100.00%


void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule) { struct blk_mq_ctx *this_ctx; struct request_queue *this_q; struct request *rq; LIST_HEAD(list); LIST_HEAD(ctx_list); unsigned int depth; list_splice_init(&plug->mq_list, &list); list_sort(NULL, &list, plug_ctx_cmp); this_q = NULL; this_ctx = NULL; depth = 0; while (!list_empty(&list)) { rq = list_entry_rq(list.next); list_del_init(&rq->queuelist); BUG_ON(!rq->q); if (rq->mq_ctx != this_ctx) { if (this_ctx) { trace_block_unplug(this_q, depth, from_schedule); blk_mq_sched_insert_requests(this_q, this_ctx, &ctx_list, from_schedule); } this_ctx = rq->mq_ctx; this_q = rq->q; depth = 0; } depth++; list_add_tail(&rq->queuelist, &ctx_list); } /* * If 'this_ctx' is set, we know we have entries to complete * on 'ctx_list'. Do those. */ if (this_ctx) { trace_block_unplug(this_q, depth, from_schedule); blk_mq_sched_insert_requests(this_q, this_ctx, &ctx_list, from_schedule); } }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe206100.00%2100.00%
Total206100.00%2100.00%


static void blk_mq_bio_to_request(struct request *rq, struct bio *bio) { blk_init_request_from_bio(rq, bio); blk_account_io_start(rq, true); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe2996.67%266.67%
Bart Van Assche13.33%133.33%
Total30100.00%3100.00%


static inline bool hctx_allow_merges(struct blk_mq_hw_ctx *hctx) { return (hctx->flags & BLK_MQ_F_SHOULD_MERGE) && !blk_queue_nomerges(hctx->queue); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe29100.00%1100.00%
Total29100.00%1100.00%


static inline void blk_mq_queue_io(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, struct request *rq) { spin_lock(&ctx->lock); __blk_mq_insert_request(hctx, rq, false); spin_unlock(&ctx->lock); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe2655.32%266.67%
Ming Lei2144.68%133.33%
Total47100.00%3100.00%


static blk_qc_t request_to_qc_t(struct blk_mq_hw_ctx *hctx, struct request *rq) { if (rq->tag != -1) return blk_tag_to_qc_t(rq->tag, hctx->queue_num, false); return blk_tag_to_qc_t(rq->internal_tag, hctx->queue_num, true); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe53100.00%2100.00%
Total53100.00%2100.00%


static void __blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx, struct request *rq, blk_qc_t *cookie, bool may_sleep) { struct request_queue *q = rq->q; struct blk_mq_queue_data bd = { .rq = rq, .last = true, }; blk_qc_t new_cookie; blk_status_t ret; bool run_queue = true; /* RCU or SRCU read lock is needed before checking quiesced flag */ if (blk_mq_hctx_stopped(hctx) || blk_queue_quiesced(q)) { run_queue = false; goto insert; } if (q->elevator) goto insert; if (!blk_mq_get_driver_tag(rq, NULL, false)) goto insert; new_cookie = request_to_qc_t(hctx, rq); /* * For OK queue, we are done. For error, kill it. Any other * error (busy), just add it to our list as we previously * would have done */ ret = q->mq_ops->queue_rq(hctx, &bd); switch (ret) { case BLK_STS_OK: *cookie = new_cookie; return; case BLK_STS_RESOURCE: __blk_mq_requeue_request(rq); goto insert; default: *cookie = BLK_QC_T_NONE; blk_mq_end_request(rq, ret); return; } insert: blk_mq_sched_insert_request(rq, false, run_queue, false, may_sleep); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe6133.15%646.15%
Shaohua Li4826.09%17.69%
Ming Lei3418.48%215.38%
Bart Van Assche2111.41%17.69%
Christoph Hellwig189.78%215.38%
Omar Sandoval21.09%17.69%
Total184100.00%13100.00%


static void blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx, struct request *rq, blk_qc_t *cookie) { if (!(hctx->flags & BLK_MQ_F_BLOCKING)) { rcu_read_lock(); __blk_mq_try_issue_directly(hctx, rq, cookie, false); rcu_read_unlock(); } else { unsigned int srcu_idx; might_sleep(); srcu_idx = srcu_read_lock(hctx->queue_rq_srcu); __blk_mq_try_issue_directly(hctx, rq, cookie, true); srcu_read_unlock(hctx->queue_rq_srcu, srcu_idx); } }

Contributors

PersonTokensPropCommitsCommitProp
Bart Van Assche4651.69%220.00%
Christoph Hellwig2224.72%110.00%
Jens Axboe1617.98%550.00%
Ming Lei44.49%110.00%
Shaohua Li11.12%110.00%
Total89100.00%10100.00%


static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio) { const int is_sync = op_is_sync(bio->bi_opf); const int is_flush_fua = op_is_flush(bio->bi_opf); struct blk_mq_alloc_data data = { .flags = 0 }; struct request *rq; unsigned int request_count = 0; struct blk_plug *plug; struct request *same_queue_rq = NULL; blk_qc_t cookie; unsigned int wb_acct; blk_queue_bounce(q, &bio); blk_queue_split(q, &bio); if (!bio_integrity_prep(bio)) return BLK_QC_T_NONE; if (!is_flush_fua && !blk_queue_nomerges(q) && blk_attempt_plug_merge(q, bio, &request_count, &same_queue_rq)) return BLK_QC_T_NONE; if (blk_mq_sched_bio_merge(q, bio)) return BLK_QC_T_NONE; wb_acct = wbt_wait(q->rq_wb, bio, NULL); trace_block_getrq(q, bio, bio->bi_opf); rq = blk_mq_get_request(q, bio, bio->bi_opf, &data); if (unlikely(!rq)) { __wbt_done(q->rq_wb, wb_acct); if (bio->bi_opf & REQ_NOWAIT) bio_wouldblock_error(bio); return BLK_QC_T_NONE; } wbt_track(&rq->issue_stat, wb_acct); cookie = request_to_qc_t(data.hctx, rq); plug = current->plug; if (unlikely(is_flush_fua)) { blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); if (q->elevator) { blk_mq_sched_insert_request(rq, false, true, true, true); } else { blk_insert_flush(rq); blk_mq_run_hw_queue(data.hctx, true); } } else if (plug && q->nr_hw_queues == 1) { struct request *last = NULL; blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); /* * @request_count may become stale because of schedule * out, so check the list again. */ if (list_empty(&plug->mq_list)) request_count = 0; else if (blk_queue_nomerges(q)) request_count = blk_plug_queued_count(q); if (!request_count) trace_block_plug(q); else last = list_entry_rq(plug->mq_list.prev); if (request_count >= BLK_MAX_REQUEST_COUNT || (last && blk_rq_bytes(last) >= BLK_PLUG_FLUSH_SIZE)) { blk_flush_plug_list(plug, false); trace_block_plug(q); } list_add_tail(&rq->queuelist, &plug->mq_list); } else if (plug && !blk_queue_nomerges(q)) { blk_mq_bio_to_request(rq, bio); /* * We do limited plugging. If the bio can be merged, do that. * Otherwise the existing request in the plug list will be * issued. So the plug list will have one request at most * The plug list might get flushed before this. If that happens, * the plug list is empty, and same_queue_rq is invalid. */ if (list_empty(&plug->mq_list)) same_queue_rq = NULL; if (same_queue_rq) list_del_init(&same_queue_rq->queuelist); list_add_tail(&rq->queuelist, &plug->mq_list); blk_mq_put_ctx(data.ctx); if (same_queue_rq) { data.hctx = blk_mq_map_queue(q, same_queue_rq->mq_ctx->cpu); blk_mq_try_issue_directly(data.hctx, same_queue_rq, &cookie); } } else if (q->nr_hw_queues > 1 && is_sync) { blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); blk_mq_try_issue_directly(data.hctx, rq, &cookie); } else if (q->elevator) { blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); blk_mq_sched_insert_request(rq, false, true, true, true); } else { blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); blk_mq_queue_io(data.hctx, data.ctx, rq); blk_mq_run_hw_queue(data.hctx, true); } return cookie; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe34853.13%1643.24%
Christoph Hellwig18127.63%718.92%
Ming Lei497.48%410.81%
Shaohua Li375.65%38.11%
Goldwyn Rodrigues131.98%12.70%
Wendy Xiong81.22%12.70%
Nicholas Bellinger71.07%12.70%
Robert Elliott50.76%12.70%
Jeff Moyer40.61%12.70%
Michael Christie20.31%12.70%
Dmitriy Monakhov10.15%12.70%
Total655100.00%37100.00%


void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, unsigned int hctx_idx) { struct page *page; if (tags->rqs && set->ops->exit_request) { int i; for (i = 0; i < tags->nr_tags; i++) { struct request *rq = tags->static_rqs[i]; if (!rq) continue; set->ops->exit_request(set, rq, hctx_idx); tags->static_rqs[i] = NULL; } } while (!list_empty(&tags->page_list)) { page = list_first_entry(&tags->page_list, struct page, lru); list_del_init(&page->lru); /* * Remove kmemleak object previously allocated in * blk_mq_init_rq_map(). */ kmemleak_free(page_address(page)); __free_pages(page, page->private); } }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe10569.08%555.56%
Christoph Hellwig3623.68%222.22%
Catalin Marinas95.92%111.11%
Dave Hansen21.32%111.11%
Total152100.00%9100.00%


void blk_mq_free_rq_map(struct blk_mq_tags *tags) { kfree(tags->rqs); tags->rqs = NULL; kfree(tags->static_rqs); tags->static_rqs = NULL; blk_mq_free_tags(tags); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe4097.56%375.00%
Christoph Hellwig12.44%125.00%
Total41100.00%4100.00%


struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set, unsigned int hctx_idx, unsigned int nr_tags, unsigned int reserved_tags) { struct blk_mq_tags *tags; int node; node = blk_mq_hw_queue_to_node(set->mq_map, hctx_idx); if (node == NUMA_NO_NODE) node = set->numa_node; tags = blk_mq_init_tags(nr_tags, reserved_tags, node, BLK_MQ_FLAG_TO_ALLOC_POLICY(set->flags)); if (!tags) return NULL; tags->rqs = kzalloc_node(nr_tags * sizeof(struct request *), GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY, node); if (!tags->rqs) { blk_mq_free_tags(tags); return NULL; } tags->static_rqs = kzalloc_node(nr_tags * sizeof(struct request *), GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY, node); if (!tags->static_rqs) { kfree(tags->rqs); blk_mq_free_tags(tags); return NULL; } return tags; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe9655.49%444.44%
Christoph Hellwig4023.12%222.22%
Shaohua Li3620.81%222.22%
Gabriel Krisman Bertazi10.58%111.11%
Total173100.00%9100.00%


static size_t order_to_size(unsigned int order) { return (size_t)PAGE_SIZE << order; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe18100.00%1100.00%
Total18100.00%1100.00%


int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, unsigned int hctx_idx, unsigned int depth) { unsigned int i, j, entries_per_page, max_order = 4; size_t rq_size, left; int node; node = blk_mq_hw_queue_to_node(set->mq_map, hctx_idx); if (node == NUMA_NO_NODE) node = set->numa_node; INIT_LIST_HEAD(&tags->page_list); /* * rq_size is the size of the request plus driver payload, rounded * to the cacheline size */ rq_size = round_up(sizeof(struct request) + set->cmd_size, cache_line_size()); left = rq_size * depth; for (i = 0; i < depth; ) { int this_order = max_order; struct page *page; int to_do; void *p; while (this_order && left < order_to_size(this_order - 1)) this_order--; do { page = alloc_pages_node(node, GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO, this_order); if (page) break; if (!this_order--) break; if (order_to_size(this_order) < rq_size) break; } while (1); if (!page) goto fail; page->private = this_order; list_add_tail(&page->lru, &tags->page_list); p = page_address(page); /* * Allow kmemleak to scan these pages as they contain pointers * to additional allocations like via ops->init_request(). */ kmemleak_alloc(p, order_to_size(this_order), 1, GFP_NOIO); entries_per_page = order_to_size(this_order) / rq_size; to_do = min(entries_per_page, depth - i); left -= to_do * rq_size; for (j = 0; j < to_do; j++) { struct request *rq = p; tags->static_rqs[i] = rq; if (set->ops->init_request) { if (set->ops->init_request(set, rq, hctx_idx, node)) { tags->static_rqs[i] = NULL; goto fail; } } p += rq_size; i++; } } return 0; fail: blk_mq_free_rqs(set, tags, hctx_idx); return -ENOMEM; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe27375.00%433.33%
Christoph Hellwig4211.54%216.67%
Shaohua Li287.69%18.33%
Catalin Marinas143.85%18.33%
Gabriel Krisman Bertazi20.55%18.33%
Linus Torvalds20.55%18.33%
Bartlomiej Zolnierkiewicz20.55%18.33%
Dave Hansen10.27%18.33%
Total364100.00%12100.00%

/* * 'cpu' is going away. splice any existing rq_list entries from this * software queue to the hw queue dispatch list, and ensure that it * gets run. */
static int blk_mq_hctx_notify_dead(unsigned int cpu, struct hlist_node *node) { struct blk_mq_hw_ctx *hctx; struct blk_mq_ctx *ctx; LIST_HEAD(tmp); hctx = hlist_entry_safe(node, struct blk_mq_hw_ctx, cpuhp_dead); ctx = __blk_mq_get_ctx(hctx->queue, cpu); spin_lock(&ctx->lock); if (!list_empty(&ctx->rq_list)) { list_splice_init(&ctx->rq_list, &tmp); blk_mq_hctx_clear_pending(hctx, ctx); } spin_unlock(&ctx->lock); if (list_empty(&tmp)) return 0; spin_lock(&hctx->lock); list_splice_tail_init(&tmp, &hctx->dispatch); spin_unlock(&hctx->lock); blk_mq_run_hw_queue(hctx, true); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe12282.43%375.00%
Thomas Gleixner2617.57%125.00%
Total148100.00%4100.00%


static void blk_mq_remove_cpuhp(struct blk_mq_hw_ctx *hctx) { cpuhp_state_remove_instance_nocalls(CPUHP_BLK_MQ_DEAD, &hctx->cpuhp_dead); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner1152.38%150.00%
Jens Axboe1047.62%150.00%
Total21100.00%2100.00%

/* hctx->ctxs will be freed in queue's release handler */
static void blk_mq_exit_hctx(struct request_queue *q, struct blk_mq_tag_set *set, struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) { blk_mq_debugfs_unregister_hctx(hctx); blk_mq_tag_idle(hctx); if (set->ops->exit_request) set->ops->exit_request(set, hctx->fq->flush_rq, hctx_idx); blk_mq_sched_exit_hctx(q, hctx, hctx_idx); if (set->ops->exit_hctx) set->ops->exit_hctx(hctx, hctx_idx); if (hctx->flags & BLK_MQ_F_BLOCKING) cleanup_srcu_struct(hctx->queue_rq_srcu); blk_mq_remove_cpuhp(hctx); blk_free_flush_queue(hctx->fq); sbitmap_free(&hctx->ctx_map); }

Contributors

PersonTokensPropCommitsCommitProp
Lei Ming5947.97%111.11%
Ming Lei2621.14%222.22%
Bart Van Assche1512.20%111.11%
Omar Sandoval1512.20%333.33%
Jens Axboe75.69%111.11%
Thomas Gleixner10.81%111.11%
Total123100.00%9100.00%


static void blk_mq_exit_hw_queues(struct request_queue *q, struct blk_mq_tag_set *set, int nr_queue) { struct blk_mq_hw_ctx *hctx; unsigned int i; queue_for_each_hw_ctx(q, hctx, i) { if (i == nr_queue) break; blk_mq_exit_hctx(q, set, hctx, i); } }

Contributors

PersonTokensPropCommitsCommitProp
Lei Ming3867.86%150.00%
Ming Lei1832.14%150.00%
Total56100.00%2100.00%


static int blk_mq_init_hctx(struct request_queue *q, struct blk_mq_tag_set *set, struct blk_mq_hw_ctx *hctx, unsigned hctx_idx) { int node; node = hctx->numa_node; if (node == NUMA_NO_NODE) node = hctx->numa_node = set->numa_node; INIT_DELAYED_WORK(&hctx->run_work, blk_mq_run_work_fn); spin_lock_init(&hctx->lock); INIT_LIST_HEAD(&hctx->dispatch); hctx->queue = q; hctx->flags = set->flags & ~BLK_MQ_F_TAG_SHARED; cpuhp_state_add_instance_nocalls(CPUHP_BLK_MQ_DEAD, &hctx->cpuhp_dead); hctx->tags = set->tags[hctx_idx]; /* * Allocate space for all possible cpus to avoid allocation at * runtime */ hctx->ctxs = kmalloc_node(nr_cpu_ids * sizeof(void *), GFP_KERNEL, node); if (!hctx->ctxs) goto unregister_cpu_notifier; if (sbitmap_init_node(&hctx->ctx_map, nr_cpu_ids, ilog2(8), GFP_KERNEL, node)) goto free_ctxs; hctx->nr_ctx = 0; if (set->ops->init_hctx && set->ops->init_hctx(hctx, set->driver_data, hctx_idx)) goto free_bitmap; if (blk_mq_sched_init_hctx(q, hctx, hctx_idx)) goto exit_hctx; hctx->fq = blk_alloc_flush_queue(q, hctx->numa_node, set->cmd_size); if (!hctx->fq) goto sched_exit_hctx; if (set->ops->init_request && set->ops->init_request(set, hctx->fq->flush_rq, hctx_idx, node)) goto free_fq; if (hctx->flags & BLK_MQ_F_BLOCKING) init_srcu_struct(hctx->queue_rq_srcu); blk_mq_debugfs_register_hctx(q, hctx); return 0; free_fq: kfree(hctx->fq); sched_exit_hctx: blk_mq_sched_exit_hctx(q, hctx, hctx_idx); exit_hctx: if (set->ops->exit_hctx) set->ops->exit_hctx(hctx, hctx_idx); free_bitmap: sbitmap_free(&hctx->ctx_map); free_ctxs: kfree(hctx->ctxs); unregister_cpu_notifier: blk_mq_remove_cpuhp(hctx); return -1; }

Contributors

PersonTokensPropCommitsCommitProp
Ming Lei15542.35%215.38%
Jens Axboe12534.15%323.08%
Omar Sandoval4412.02%323.08%
Christoph Hellwig205.46%215.38%
Bart Van Assche154.10%17.69%
Thomas Gleixner41.09%17.69%
Jeff Moyer30.82%17.69%
Total366100.00%13100.00%


static void blk_mq_init_cpu_queues(struct request_queue *q, unsigned int nr_hw_queues) { unsigned int i; for_each_possible_cpu(i) { struct blk_mq_ctx *__ctx = per_cpu_ptr(q->queue_ctx, i); struct blk_mq_hw_ctx *hctx; __ctx->cpu = i; spin_lock_init(&__ctx->lock); INIT_LIST_HEAD(&__ctx->rq_list); __ctx->queue = q; /* If the cpu isn't present, the cpu is mapped to first hctx */ if (!cpu_present(i)) continue; hctx = blk_mq_map_queue(q, i); /* * Set local node, IFF we have more than one hw queue. If * not, we remain on the home node of the device */ if (nr_hw_queues > 1 && hctx->numa_node == NUMA_NO_NODE) hctx->numa_node = local_memory_node(cpu_to_node(i)); } }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe11094.83%240.00%
Raghavendra K T32.59%120.00%
Christoph Hellwig32.59%240.00%
Total116100.00%5100.00%


static bool __blk_mq_alloc_rq_map(struct blk_mq_tag_set *set, int hctx_idx) { int ret = 0; set->tags[hctx_idx] = blk_mq_alloc_rq_map(set, hctx_idx, set->queue_depth, set->reserved_tags); if (!set->tags[hctx_idx]) return false; ret = blk_mq_alloc_rqs(set, set->tags[hctx_idx], hctx_idx, set->queue_depth); if (!ret) return true; blk_mq_free_rq_map(set->tags[hctx_idx]); set->tags[hctx_idx] = NULL; return false; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe104100.00%1100.00%
Total104100.00%1100.00%


static void blk_mq_free_map_and_requests(struct blk_mq_tag_set *set, unsigned int hctx_idx) { if (set->tags[hctx_idx]) { blk_mq_free_rqs(set, set->tags[hctx_idx], hctx_idx); blk_mq_free_rq_map(set->tags[hctx_idx]); set->tags[hctx_idx] = NULL; } }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe59100.00%2100.00%
Total59100.00%2100.00%


static void blk_mq_map_swqueue(struct request_queue *q) { unsigned int i, hctx_idx; struct blk_mq_hw_ctx *hctx; struct blk_mq_ctx *ctx; struct blk_mq_tag_set *set = q->tag_set; /* * Avoid others reading imcomplete hctx->cpumask through sysfs */ mutex_lock(&q->sysfs_lock); queue_for_each_hw_ctx(q, hctx, i) { cpumask_clear(hctx->cpumask); hctx->nr_ctx = 0; } /* * Map software to hardware queues. * * If the cpu isn't present, the cpu is mapped to first hctx. */ for_each_present_cpu(i) { hctx_idx = q->mq_map[i]; /* unmapped hw queue can be remapped after CPU topo changed */ if (!set->tags[hctx_idx] && !__blk_mq_alloc_rq_map(set, hctx_idx)) { /* * If tags initialization fail for some hctx, * that hctx won't be brought online. In this * case, remap the current ctx to hctx[0] which * is guaranteed to always have tags allocated */ q->mq_map[i] = 0; } ctx = per_cpu_ptr(q->queue_ctx, i); hctx = blk_mq_map_queue(q, i); cpumask_set_cpu(i, hctx->cpumask); ctx->index_hw = hctx->nr_ctx; hctx->ctxs[hctx->nr_ctx++] = ctx; } mutex_unlock(&q->sysfs_lock); queue_for_each_hw_ctx(q, hctx, i) { /* * If no software queues are mapped to this hardware queue, * disable it and free the request entries. */ if (!hctx->nr_ctx) { /* Never unmap queue 0. We need it as a * fallback in case of a new remap fails * allocation */ if (i && set->tags[i]) blk_mq_free_map_and_requests(set, i); hctx->tags = NULL; continue; } hctx->tags = set->tags[i]; WARN_ON(!hctx->tags); /* * Set the map size to the number of mapped software queues. * This is more accurate and more efficient than looping * over all possibly mapped software queues. */ sbitmap_resize(&hctx->ctx_map, hctx->nr_ctx); /* * Initialize batch roundrobin counts */ hctx->next_cpu = cpumask_first(hctx->cpumask); hctx->next_cpu_batch = BLK_MQ_CPU_WORK_BATCH; } }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe15959.33%746.67%
Gabriel Krisman Bertazi4014.93%16.67%
Ming Lei2810.45%16.67%
Akinobu Mita176.34%16.67%
Thomas Gleixner114.10%16.67%
Omar Sandoval51.87%16.67%
Chong Yuan51.87%16.67%
Christoph Hellwig31.12%213.33%
Total268100.00%15100.00%

/* * Caller needs to ensure that we're either frozen/quiesced, or that * the queue isn't live yet. */
static void queue_set_hctx_shared(struct request_queue *q, bool shared) { struct blk_mq_hw_ctx *hctx; int i; queue_for_each_hw_ctx(q, hctx, i) { if (shared) { if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state)) atomic_inc(&q->shared_hctx_restart); hctx->flags |= BLK_MQ_F_TAG_SHARED; } else { if (test_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state)) atomic_dec(&q->shared_hctx_restart); hctx->flags &= ~BLK_MQ_F_TAG_SHARED; } } }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe8792.55%266.67%
Jeff Moyer77.45%133.33%
Total94100.00%3100.00%


static void blk_mq_update_tag_set_depth(struct blk_mq_tag_set *set, bool shared) { struct request_queue *q; lockdep_assert_held(&set->tag_list_lock); list_for_each_entry(q, &set->tag_list, tag_set_list) { blk_mq_freeze_queue(q); queue_set_hctx_shared(q, shared); blk_mq_unfreeze_queue(q); } }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Moyer3972.22%133.33%
Bart Van Assche814.81%133.33%
Jens Axboe712.96%133.33%
Total54100.00%3100.00%


static void blk_mq_del_queue_tag_set(struct request_queue *q) { struct blk_mq_tag_set *set = q->tag_set; mutex_lock(&set->tag_list_lock); list_del_rcu(&q->tag_set_list); INIT_LIST_HEAD(&q->tag_set_list); if (list_is_singular(&set->tag_list)) { /* just transitioned to unshared */ set->flags &= ~BLK_MQ_F_TAG_SHARED; /* update existing queue */ blk_mq_update_tag_set_depth(set, false); } mutex_unlock(&set->tag_list_lock); synchronize_rcu(); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe4857.83%133.33%
Jeff Moyer2327.71%133.33%
Bart Van Assche1214.46%133.33%
Total83100.00%3100.00%


static void blk_mq_add_queue_tag_set(struct blk_mq_tag_set *set, struct request_queue *q) { q->tag_set = set; mutex_lock(&set->tag_list_lock); /* Check to see if we're transitioning to shared (from 1 to 2 queues). */ if (!list_empty(&set->tag_list) && !(set->flags & BLK_MQ_F_TAG_SHARED)) { set->flags |= BLK_MQ_F_TAG_SHARED; /* update existing queue */ blk_mq_update_tag_set_depth(set, true); } if (set->flags & BLK_MQ_F_TAG_SHARED) queue_set_hctx_shared(q, true); list_add_tail_rcu(&q->tag_set_list, &set->tag_list); mutex_unlock(&set->tag_list_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Jeff Moyer5250.49%133.33%
Jens Axboe5048.54%133.33%
Bart Van Assche10.97%133.33%
Total103100.00%3100.00%

/* * It is the actual release handler for mq, but we do it from * request queue's release handler for avoiding use-after-free * and headache because q->mq_kobj shouldn't have been introduced, * but we can't group ctx/kctx kobj without it. */
void blk_mq_release(struct request_queue *q) { struct blk_mq_hw_ctx *hctx; unsigned int i; /* hctx kobj stays in hctx */ queue_for_each_hw_ctx(q, hctx, i) { if (!hctx) continue; kobject_put(&hctx->kobj); } q->mq_map = NULL; kfree(q->queue_hw_ctx); /* * release .mq_kobj and sw queue's kobject now because * both share lifetime with request queue. */ blk_mq_sysfs_deinit(q); free_percpu(q->queue_ctx); }

Contributors

PersonTokensPropCommitsCommitProp
Ming Lei4057.14%120.00%
Lei Ming2028.57%360.00%
Akinobu Mita1014.29%120.00%
Total70100.00%5100.00%


struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) { struct request_queue *uninit_q, *q; uninit_q = blk_alloc_queue_node(GFP_KERNEL, set->numa_node); if (!uninit_q) return ERR_PTR(-ENOMEM); q = blk_mq_init_allocated_queue(set, uninit_q); if (IS_ERR(q)) blk_cleanup_queue(uninit_q); return q; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Snitzer5582.09%133.33%
Jens Axboe1014.93%133.33%
Christoph Hellwig22.99%133.33%
Total67100.00%3100.00%

EXPORT_SYMBOL(blk_mq_init_queue);
static int blk_mq_hw_ctx_size(struct blk_mq_tag_set *tag_set) { int hw_ctx_size = sizeof(struct blk_mq_hw_ctx); BUILD_BUG_ON(ALIGN(offsetof(struct blk_mq_hw_ctx, queue_rq_srcu), __alignof__(struct blk_mq_hw_ctx)) != sizeof(struct blk_mq_hw_ctx)); if (tag_set->flags & BLK_MQ_F_BLOCKING) hw_ctx_size += sizeof(struct srcu_struct); return hw_ctx_size; }

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PersonTokensPropCommitsCommitProp
Bart Van Assche65100.00%1100.00%
Total65100.00%1100.00%


static void blk_mq_realloc_hw_ctxs(struct blk_mq_tag_set *set, struct request_queue *q) { int i, j; struct blk_mq_hw_ctx **hctxs = q->queue_hw_ctx; blk_mq_sysfs_unregister(q); for (i = 0; i < set->nr_hw_queues; i++) { int node; if (hctxs[i]) continue; node = blk_mq_hw_queue_to_node(q->mq_map, i); hctxs[i] = kzalloc_node(blk_mq_hw_ctx_size(set), GFP_KERNEL, node); if (!hctxs[i]) break; if (!zalloc_cpumask_var_node(&hctxs[i]->cpumask, GFP_KERNEL, node)) { kfree(hctxs[i]); hctxs[i] = NULL; break; } atomic_set(&hctxs[i]->nr_active, 0); hctxs[i]->numa_node = node; hctxs[i]->queue_num = i; if (blk_mq_init_hctx(q, set, hctxs[i], i)) { free_cpumask_var(hctxs[i]->cpumask); kfree(hctxs[i]); hctxs[i] = NULL; break; } blk_mq_hctx_kobj_init(hctxs[i]); } for (j = i; j < q->nr_hw_queues; j++) { struct blk_mq_hw_ctx *hctx = hctxs[j]; if (hctx) { if (hctx->tags) blk_mq_free_map_and_requests(set, j); blk_mq_exit_hctx(q, set, hctx, j); kobject_put(&hctx->kobj); hctxs[j] = NULL; } } q->nr_hw_queues = i; blk_mq_sysfs_register(q); }

Contributors

PersonTokensPropCommitsCommitProp
Keith Busch16755.12%18.33%
Jens Axboe11537.95%650.00%
Mike Snitzer123.96%18.33%
Christoph Hellwig61.98%216.67%
Bart Van Assche20.66%18.33%
Wei Fang10.33%18.33%
Total303100.00%12100.00%


struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, struct request_queue *q) { /* mark the queue as mq asap */ q->mq_ops = set->ops; q->poll_cb = blk_stat_alloc_callback(blk_mq_poll_stats_fn, blk_mq_poll_stats_bkt, BLK_MQ_POLL_STATS_BKTS, q); if (!q->poll_cb) goto err_exit; q->queue_ctx = alloc_percpu(struct blk_mq_ctx); if (!q->queue_ctx) goto err_exit; /* init q->mq_kobj and sw queues' kobjects */ blk_mq_sysfs_init(q); q->queue_hw_ctx = kzalloc_node(nr_cpu_ids * sizeof(*(q->queue_hw_ctx)), GFP_KERNEL, set->numa_node); if (!q->queue_hw_ctx) goto err_percpu; q->mq_map = set->mq_map; blk_mq_realloc_hw_ctxs(set, q); if (!q->nr_hw_queues) goto err_hctxs; INIT_WORK(&q->timeout_work, blk_mq_timeout_work); blk_queue_rq_timeout(q, set->timeout ? set->timeout : 30 * HZ); q->nr_queues = nr_cpu_ids; q->queue_flags |= QUEUE_FLAG_MQ_DEFAULT; if (!(set->flags & BLK_MQ_F_SG_MERGE)) q->queue_flags |= 1 << QUEUE_FLAG_NO_SG_MERGE; q->sg_reserved_size = INT_MAX; INIT_DELAYED_WORK(&q->requeue_work, blk_mq_requeue_work); INIT_LIST_HEAD(&q->requeue_list); spin_lock_init(&q->requeue_lock); blk_queue_make_request(q, blk_mq_make_request); /* * Do this after blk_queue_make_request() overrides it... */ q->nr_requests = set->queue_depth; /* * Default to classic polling */ q->poll_nsec = -1; if (set->ops->complete) blk_queue_softirq_done(q, set->ops->complete); blk_mq_init_cpu_queues(q, set->nr_hw_queues); blk_mq_add_queue_tag_set(set, q); blk_mq_map_swqueue(q); if (!(set->flags & BLK_MQ_F_NO_SCHED)) { int ret; ret = blk_mq_sched_init(q); if (ret) return ERR_PTR(ret); } return q; err_hctxs: kfree(q->queue_hw_ctx); err_percpu: free_percpu(q->queue_ctx); err_exit: q->mq_ops = NULL; return ERR_PTR(-ENOMEM); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe16345.28%1038.46%
Keith Busch8222.78%13.85%
Christoph Hellwig5615.56%623.08%
Omar Sandoval215.83%13.85%
Lin Ming113.06%13.85%
Lei Ming113.06%27.69%
Wei Fang82.22%13.85%
Ming Lei30.83%13.85%
Stephen Bates20.56%13.85%
Akinobu Mita20.56%13.85%
Mike Snitzer10.28%13.85%
Total360100.00%26100.00%

EXPORT_SYMBOL(blk_mq_init_allocated_queue);
void blk_mq_free_queue(struct request_queue *q) { struct blk_mq_tag_set *set = q->tag_set; blk_mq_del_queue_tag_set(q); blk_mq_exit_hw_queues(q, set, set->nr_hw_queues); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe2468.57%266.67%
Lei Ming1131.43%133.33%
Total35100.00%3100.00%

/* Basically redo blk_mq_init_queue with queue frozen */
static void blk_mq_queue_reinit(struct request_queue *q) { WARN_ON_ONCE(!atomic_read(&q->mq_freeze_depth)); blk_mq_debugfs_unregister_hctxs(q); blk_mq_sysfs_unregister(q); /* * redo blk_mq_init_cpu_queues and blk_mq_init_hw_queues. FIXME: maybe * we should change hctx numa_node according to new topology (this * involves free and re-allocate memory, worthy doing?) */ blk_mq_map_swqueue(q); blk_mq_sysfs_register(q); blk_mq_debugfs_register_hctxs(q); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe3163.27%240.00%
Omar Sandoval1020.41%120.00%
Christoph Hellwig48.16%120.00%
Tejun Heo48.16%120.00%
Total49100.00%5100.00%


static int __blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) { int i; for (i = 0; i < set->nr_hw_queues; i++) if (!__blk_mq_alloc_rq_map(set, i)) goto out_unwind; return 0; out_unwind: while (--i >= 0) blk_mq_free_rq_map(set->tags[i]); return -ENOMEM; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe68100.00%2100.00%
Total68100.00%2100.00%

/* * Allocate the request maps associated with this tag_set. Note that this * may reduce the depth asked for, if memory is tight. set->queue_depth * will be updated to reflect the allocated depth. */
static int blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) { unsigned int depth; int err; depth = set->queue_depth; do { err = __blk_mq_alloc_rq_maps(set); if (!err) break; set->queue_depth >>= 1; if (set->queue_depth < set->reserved_tags + BLK_MQ_TAG_MIN) { err = -ENOMEM; break; } } while (set->queue_depth); if (!set->queue_depth || err) { pr_err("blk-mq: failed to allocate request map\n"); return -ENOMEM; } if (depth != set->queue_depth) pr_info("blk-mq: reduced tag depth (%u -> %u)\n", depth, set->queue_depth); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe115100.00%1100.00%
Total115100.00%1100.00%


static int blk_mq_update_queue_map(struct blk_mq_tag_set *set) { if (set->ops->map_queues) return set->ops->map_queues(set); else return blk_mq_map_queues(set); }

Contributors

PersonTokensPropCommitsCommitProp
Omar Sandoval36100.00%1100.00%
Total36100.00%1100.00%

/* * Alloc a tag set to be associated with one or more request queues. * May fail with EINVAL for various error conditions. May adjust the * requested depth down, if if it too large. In that case, the set * value will be stored in set->queue_depth. */
int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) { int ret; BUILD_BUG_ON(BLK_MQ_MAX_DEPTH > 1 << BLK_MQ_UNIQUE_TAG_BITS); if (!set->nr_hw_queues) return -EINVAL; if (!set->queue_depth) return -EINVAL; if (set->queue_depth < set->reserved_tags + BLK_MQ_TAG_MIN) return -EINVAL; if (!set->ops->queue_rq) return -EINVAL; if (set->queue_depth > BLK_MQ_MAX_DEPTH) { pr_info("blk-mq: reduced tag depth to %u\n", BLK_MQ_MAX_DEPTH); set->queue_depth = BLK_MQ_MAX_DEPTH; } /* * If a crashdump is active, then we are potentially in a very * memory constrained environment. Limit us to 1 queue and * 64 tags to prevent using too much memory. */ if (is_kdump_kernel()) { set->nr_hw_queues = 1; set->queue_depth = min(64U, set->queue_depth); } /* * There is no use for more h/w queues than cpus. */ if (set->nr_hw_queues > nr_cpu_ids) set->nr_hw_queues = nr_cpu_ids; set->tags = kzalloc_node(nr_cpu_ids * sizeof(struct blk_mq_tags *), GFP_KERNEL, set->numa_node); if (!set->tags) return -ENOMEM; ret = -ENOMEM; set->mq_map = kzalloc_node(sizeof(*set->mq_map) * nr_cpu_ids, GFP_KERNEL, set->numa_node); if (!set->mq_map) goto out_free_tags; ret = blk_mq_update_queue_map(set); if (ret) goto out_free_mq_map; ret = blk_mq_alloc_rq_maps(set); if (ret) goto out_free_mq_map; mutex_init(&set->tag_list_lock); INIT_LIST_HEAD(&set->tag_list); return 0; out_free_mq_map: kfree(set->mq_map); set->mq_map = NULL; out_free_tags: kfree(set->tags); set->tags = NULL; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig18162.63%325.00%
Jens Axboe4615.92%325.00%
Shaohua Li279.34%18.33%
Keith Busch175.88%18.33%
Bart Van Assche93.11%18.33%
Robert Elliott72.42%18.33%
Omar Sandoval10.35%18.33%
Lei Ming10.35%18.33%
Total289100.00%12100.00%

EXPORT_SYMBOL(blk_mq_alloc_tag_set);
void blk_mq_free_tag_set(struct blk_mq_tag_set *set) { int i; for (i = 0; i < nr_cpu_ids; i++) blk_mq_free_map_and_requests(set, i); kfree(set->mq_map); set->mq_map = NULL; kfree(set->tags); set->tags = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig4474.58%233.33%
Lei Ming711.86%116.67%
Robert Elliott610.17%116.67%
Jens Axboe11.69%116.67%
Keith Busch11.69%116.67%
Total59100.00%6100.00%

EXPORT_SYMBOL(blk_mq_free_tag_set);
int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) { struct blk_mq_tag_set *set = q->tag_set; struct blk_mq_hw_ctx *hctx; int i, ret; if (!set) return -EINVAL; blk_mq_freeze_queue(q); ret = 0; queue_for_each_hw_ctx(q, hctx, i) { if (!hctx->tags) continue; /* * If we're using an MQ scheduler, just update the scheduler * queue depth. This is similar to what the old code would do. */ if (!hctx->sched_tags) { ret = blk_mq_tag_update_depth(hctx, &hctx->tags, min(nr, set->queue_depth), false); } else { ret = blk_mq_tag_update_depth(hctx, &hctx->sched_tags, nr, true); } if (ret) break; } if (!ret) q->nr_requests = nr; blk_mq_unfreeze_queue(q); return ret; }

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PersonTokensPropCommitsCommitProp
Jens Axboe13794.48%375.00%
Keith Busch85.52%125.00%
Total145100.00%4100.00%


static void __blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues) { struct request_queue *q; lockdep_assert_held(&set->tag_list_lock); if (nr_hw_queues > nr_cpu_ids) nr_hw_queues = nr_cpu_ids; if (nr_hw_queues < 1 || nr_hw_queues == set->nr_hw_queues) return; list_for_each_entry(q, &set->tag_list, tag_set_list) blk_mq_freeze_queue(q); set->nr_hw_queues = nr_hw_queues; blk_mq_update_queue_map(set); list_for_each_entry(q, &set->tag_list, tag_set_list) { blk_mq_realloc_hw_ctxs(set, q); blk_mq_queue_reinit(q); } list_for_each_entry(q, &set->tag_list, tag_set_list) blk_mq_unfreeze_queue(q); }

Contributors

PersonTokensPropCommitsCommitProp
Keith Busch9688.07%250.00%
Bart Van Assche87.34%125.00%
Omar Sandoval54.59%125.00%
Total109100.00%4100.00%


void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues) { mutex_lock(&set->tag_list_lock); __blk_mq_update_nr_hw_queues(set, nr_hw_queues); mutex_unlock(&set->tag_list_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Keith Busch36100.00%2100.00%
Total36100.00%2100.00%

EXPORT_SYMBOL_GPL(blk_mq_update_nr_hw_queues); /* Enable polling stats and return whether they were already enabled. */
static bool blk_poll_stats_enable(struct request_queue *q) { if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags) || test_and_set_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags)) return true; blk_stat_add_callback(q, q->poll_cb); return false; }

Contributors

PersonTokensPropCommitsCommitProp
Omar Sandoval48100.00%1100.00%
Total48100.00%1100.00%


static void blk_mq_poll_stats_start(struct request_queue *q) { /* * We don't arm the callback if polling stats are not enabled or the * callback is already active. */ if (!test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags) || blk_stat_is_active(q->poll_cb)) return; blk_stat_activate_msecs(q->poll_cb, 100); }

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PersonTokensPropCommitsCommitProp
Omar Sandoval42100.00%1100.00%
Total42100.00%1100.00%


static void blk_mq_poll_stats_fn(struct blk_stat_callback *cb) { struct request_queue *q = cb->data; int bucket; for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS; bucket++) { if (cb->stat[bucket].nr_samples) q->poll_stat[bucket] = cb->stat[bucket]; } }

Contributors

PersonTokensPropCommitsCommitProp
Omar Sandoval4368.25%150.00%
Stephen Bates2031.75%150.00%
Total63100.00%2100.00%


static unsigned long blk_mq_poll_nsecs(struct request_queue *q, struct blk_mq_hw_ctx *hctx, struct request *rq) { unsigned long ret = 0; int bucket; /* * If stats collection isn't on, don't sleep but turn it on for * future users */ if (!blk_poll_stats_enable(q)) return 0; /* * As an optimistic guess, use half of the mean service time * for this type of request. We can (and should) make this smarter. * For instance, if the completion latencies are tight, we can * get closer than just half the mean. This is especially * important on devices where the completion latencies are longer * than ~10 usec. We do use the stats for the relevant IO size * if available which does lead to better estimates. */ bucket = blk_mq_poll_stats_bkt(rq); if (bucket < 0) return ret; if (q->poll_stat[bucket].nr_samples) ret = (q->poll_stat[bucket].mean + 1) / 2; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe7076.92%133.33%
Stephen Bates1415.38%133.33%
Omar Sandoval77.69%133.33%
Total91100.00%3100.00%


static bool blk_mq_poll_hybrid_sleep(struct request_queue *q, struct blk_mq_hw_ctx *hctx, struct request *rq) { struct hrtimer_sleeper hs; enum hrtimer_mode mode; unsigned int nsecs; ktime_t kt; if (test_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags)) return false; /* * poll_nsec can be: * * -1: don't ever hybrid sleep * 0: use half of prev avg * >0: use this specific value */ if (q->poll_nsec == -1) return false; else if (q->poll_nsec > 0) nsecs = q->poll_nsec; else nsecs = blk_mq_poll_nsecs(q, hctx, rq); if (!nsecs) return false; set_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags); /* * This will be replaced with the stats tracking code, using * 'avg_completion_time / 2' as the pre-sleep target. */ kt = nsecs; mode = HRTIMER_MODE_REL; hrtimer_init_on_stack(&hs.timer, CLOCK_MONOTONIC, mode); hrtimer_set_expires(&hs.timer, kt); hrtimer_init_sleeper(&hs, current); do { if (test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) break; set_current_state(TASK_UNINTERRUPTIBLE); hrtimer_start_expires(&hs.timer, mode); if (hs.task) io_schedule(); hrtimer_cancel(&hs.timer); mode = HRTIMER_MODE_ABS; } while (hs.task && !signal_pending(current)); __set_current_state(TASK_RUNNING); destroy_hrtimer_on_stack(&hs.timer); return true; }

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PersonTokensPropCommitsCommitProp
Jens Axboe229100.00%2100.00%
Total229100.00%2100.00%


static bool __blk_mq_poll(struct blk_mq_hw_ctx *hctx, struct request *rq) { struct request_queue *q = hctx->queue; long state; /* * If we sleep, have the caller restart the poll loop to reset * the state. Like for the other success return cases, the * caller is responsible for checking if the IO completed. If * the IO isn't complete, we'll get called again and will go * straight to the busy poll loop. */ if (blk_mq_poll_hybrid_sleep(q, hctx, rq)) return true; hctx->poll_considered++; state = current->state; while (!need_resched()) { int ret; hctx->poll_invoked++; ret = q->mq_ops->poll(hctx, rq->tag); if (ret > 0) { hctx->poll_success++; set_current_state(TASK_RUNNING); return true; } if (signal_pending_state(state, current)) set_current_state(TASK_RUNNING); if (current->state == TASK_RUNNING) return true; if (ret < 0) break; cpu_relax(); } return false; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe144100.00%3100.00%
Total144100.00%3100.00%


bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie) { struct blk_mq_hw_ctx *hctx; struct blk_plug *plug; struct request *rq; if (!q->mq_ops || !q->mq_ops->poll || !blk_qc_t_valid(cookie) || !test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) return false; plug = current->plug; if (plug) blk_flush_plug_list(plug, false); hctx = q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)]; if (!blk_qc_t_is_internal(cookie)) rq = blk_mq_tag_to_rq(hctx->tags, blk_qc_t_to_tag(cookie)); else { rq = blk_mq_tag_to_rq(hctx->sched_tags, blk_qc_t_to_tag(cookie)); /* * With scheduling, if the request has completed, we'll * get a NULL return here, as we clear the sched tag when * that happens. The request still remains valid, like always, * so we should be safe with just the NULL check. */ if (!rq) return false; } return __blk_mq_poll(hctx, rq); }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe147100.00%3100.00%
Total147100.00%3100.00%

EXPORT_SYMBOL_GPL(blk_mq_poll);
static int __init blk_mq_init(void) { cpuhp_setup_state_multi(CPUHP_BLK_MQ_DEAD, "block/mq:dead", NULL, blk_mq_hctx_notify_dead); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe1356.52%150.00%
Thomas Gleixner1043.48%150.00%
Total23100.00%2100.00%

subsys_initcall(blk_mq_init);

Overall Contributors

PersonTokensPropCommitsCommitProp
Jens Axboe589849.52%9232.86%
Christoph Hellwig244620.54%5519.64%
Omar Sandoval6835.73%134.64%
Bart Van Assche5995.03%207.14%
Ming Lei5114.29%207.14%
Keith Busch5094.27%103.57%
Shaohua Li1831.54%72.50%
Lei Ming1771.49%155.36%
Jeff Moyer1281.07%20.71%
Ming Lin1251.05%10.36%
Stephen Bates1100.92%10.36%
Mike Snitzer1090.92%31.07%
Tejun Heo640.54%62.14%
Thomas Gleixner630.53%20.71%
Gabriel Krisman Bertazi480.40%31.07%
Akinobu Mita290.24%31.07%
Catalin Marinas260.22%10.36%
Goldwyn Rodrigues250.21%10.36%
Dan J Williams230.19%10.36%
Sagi Grimberg210.18%10.36%
Paolo Bonzini200.17%20.71%
Joe Lawrence200.17%10.36%
Robert Elliott180.15%20.71%
Lin Ming110.09%10.36%
Hannes Reinecke110.09%10.36%
Wei Fang90.08%10.36%
Ingo Molnar80.07%41.43%
Wendy Xiong80.07%10.36%
Nicholas Bellinger70.06%10.36%
Chong Yuan50.04%10.36%
Michael Christie40.03%20.71%
Dave Hansen30.03%10.36%
Raghavendra K T30.03%10.36%
Linus Torvalds20.02%10.36%
Bartlomiej Zolnierkiewicz20.02%10.36%
Dmitriy Monakhov10.01%10.36%
Frédéric Weisbecker10.01%10.36%
Total11910100.00%280100.00%
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