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https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 00:34:20 +08:00
76d697d107
The kobject memory shouldn't have been freed before the kobject is released because driver core can access it freely before its release. This patch frees hctx in its release callback. For ctx, they share one single per-cpu variable which is associated with the request queue, so free ctx in q->mq_kobj's release handler. Signed-off-by: Sasha Levin <sasha.levin@oracle.com> (fix ctx kobjects) Signed-off-by: Ming Lei <ming.lei@canonical.com> Signed-off-by: Jens Axboe <axboe@fb.com>
483 lines
11 KiB
C
483 lines
11 KiB
C
#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/backing-dev.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/smp.h>
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#include <linux/blk-mq.h>
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#include "blk-mq.h"
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#include "blk-mq-tag.h"
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static void blk_mq_sysfs_release(struct kobject *kobj)
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{
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struct request_queue *q;
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q = container_of(kobj, struct request_queue, mq_kobj);
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free_percpu(q->queue_ctx);
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}
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static void blk_mq_ctx_release(struct kobject *kobj)
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{
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struct blk_mq_ctx *ctx;
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ctx = container_of(kobj, struct blk_mq_ctx, kobj);
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kobject_put(&ctx->queue->mq_kobj);
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}
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static void blk_mq_hctx_release(struct kobject *kobj)
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{
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struct blk_mq_hw_ctx *hctx;
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hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
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kfree(hctx);
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}
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struct blk_mq_ctx_sysfs_entry {
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struct attribute attr;
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ssize_t (*show)(struct blk_mq_ctx *, char *);
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ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t);
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};
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struct blk_mq_hw_ctx_sysfs_entry {
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struct attribute attr;
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ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
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ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t);
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};
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static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
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char *page)
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{
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struct blk_mq_ctx_sysfs_entry *entry;
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struct blk_mq_ctx *ctx;
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struct request_queue *q;
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ssize_t res;
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entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
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ctx = container_of(kobj, struct blk_mq_ctx, kobj);
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q = ctx->queue;
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if (!entry->show)
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return -EIO;
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res = -ENOENT;
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mutex_lock(&q->sysfs_lock);
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if (!blk_queue_dying(q))
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res = entry->show(ctx, page);
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mutex_unlock(&q->sysfs_lock);
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return res;
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}
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static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
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const char *page, size_t length)
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{
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struct blk_mq_ctx_sysfs_entry *entry;
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struct blk_mq_ctx *ctx;
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struct request_queue *q;
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ssize_t res;
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entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
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ctx = container_of(kobj, struct blk_mq_ctx, kobj);
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q = ctx->queue;
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if (!entry->store)
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return -EIO;
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res = -ENOENT;
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mutex_lock(&q->sysfs_lock);
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if (!blk_queue_dying(q))
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res = entry->store(ctx, page, length);
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mutex_unlock(&q->sysfs_lock);
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return res;
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}
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static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
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struct attribute *attr, char *page)
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{
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struct blk_mq_hw_ctx_sysfs_entry *entry;
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struct blk_mq_hw_ctx *hctx;
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struct request_queue *q;
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ssize_t res;
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entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
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hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
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q = hctx->queue;
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if (!entry->show)
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return -EIO;
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res = -ENOENT;
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mutex_lock(&q->sysfs_lock);
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if (!blk_queue_dying(q))
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res = entry->show(hctx, page);
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mutex_unlock(&q->sysfs_lock);
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return res;
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}
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static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
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struct attribute *attr, const char *page,
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size_t length)
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{
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struct blk_mq_hw_ctx_sysfs_entry *entry;
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struct blk_mq_hw_ctx *hctx;
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struct request_queue *q;
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ssize_t res;
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entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
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hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
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q = hctx->queue;
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if (!entry->store)
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return -EIO;
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res = -ENOENT;
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mutex_lock(&q->sysfs_lock);
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if (!blk_queue_dying(q))
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res = entry->store(hctx, page, length);
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mutex_unlock(&q->sysfs_lock);
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return res;
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}
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static ssize_t blk_mq_sysfs_dispatched_show(struct blk_mq_ctx *ctx, char *page)
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{
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return sprintf(page, "%lu %lu\n", ctx->rq_dispatched[1],
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ctx->rq_dispatched[0]);
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}
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static ssize_t blk_mq_sysfs_merged_show(struct blk_mq_ctx *ctx, char *page)
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{
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return sprintf(page, "%lu\n", ctx->rq_merged);
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}
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static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx *ctx, char *page)
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{
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return sprintf(page, "%lu %lu\n", ctx->rq_completed[1],
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ctx->rq_completed[0]);
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}
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static ssize_t sysfs_list_show(char *page, struct list_head *list, char *msg)
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{
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char *start_page = page;
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struct request *rq;
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page += sprintf(page, "%s:\n", msg);
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list_for_each_entry(rq, list, queuelist)
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page += sprintf(page, "\t%p\n", rq);
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return page - start_page;
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}
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static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page)
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{
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ssize_t ret;
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spin_lock(&ctx->lock);
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ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending");
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spin_unlock(&ctx->lock);
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return ret;
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}
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static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
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char *page)
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{
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return sprintf(page, "%lu\n", hctx->queued);
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}
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static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page)
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{
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return sprintf(page, "%lu\n", hctx->run);
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}
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static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx,
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char *page)
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{
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char *start_page = page;
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int i;
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page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
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for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) {
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unsigned long d = 1U << (i - 1);
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page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]);
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}
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return page - start_page;
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}
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static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx,
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char *page)
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{
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ssize_t ret;
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spin_lock(&hctx->lock);
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ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending");
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spin_unlock(&hctx->lock);
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return ret;
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}
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static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page)
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{
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return blk_mq_tag_sysfs_show(hctx->tags, page);
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}
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static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx *hctx, char *page)
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{
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return sprintf(page, "%u\n", atomic_read(&hctx->nr_active));
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}
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static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
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{
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unsigned int i, first = 1;
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ssize_t ret = 0;
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blk_mq_disable_hotplug();
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for_each_cpu(i, hctx->cpumask) {
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if (first)
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ret += sprintf(ret + page, "%u", i);
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else
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ret += sprintf(ret + page, ", %u", i);
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first = 0;
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}
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blk_mq_enable_hotplug();
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ret += sprintf(ret + page, "\n");
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return ret;
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}
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static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
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.attr = {.name = "dispatched", .mode = S_IRUGO },
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.show = blk_mq_sysfs_dispatched_show,
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};
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static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
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.attr = {.name = "merged", .mode = S_IRUGO },
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.show = blk_mq_sysfs_merged_show,
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};
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static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
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.attr = {.name = "completed", .mode = S_IRUGO },
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.show = blk_mq_sysfs_completed_show,
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};
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static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
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.attr = {.name = "rq_list", .mode = S_IRUGO },
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.show = blk_mq_sysfs_rq_list_show,
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};
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static struct attribute *default_ctx_attrs[] = {
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&blk_mq_sysfs_dispatched.attr,
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&blk_mq_sysfs_merged.attr,
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&blk_mq_sysfs_completed.attr,
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&blk_mq_sysfs_rq_list.attr,
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NULL,
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};
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
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.attr = {.name = "queued", .mode = S_IRUGO },
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.show = blk_mq_hw_sysfs_queued_show,
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};
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
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.attr = {.name = "run", .mode = S_IRUGO },
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.show = blk_mq_hw_sysfs_run_show,
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};
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
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.attr = {.name = "dispatched", .mode = S_IRUGO },
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.show = blk_mq_hw_sysfs_dispatched_show,
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};
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = {
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.attr = {.name = "active", .mode = S_IRUGO },
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.show = blk_mq_hw_sysfs_active_show,
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};
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
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.attr = {.name = "pending", .mode = S_IRUGO },
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.show = blk_mq_hw_sysfs_rq_list_show,
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};
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
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.attr = {.name = "tags", .mode = S_IRUGO },
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.show = blk_mq_hw_sysfs_tags_show,
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};
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
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.attr = {.name = "cpu_list", .mode = S_IRUGO },
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.show = blk_mq_hw_sysfs_cpus_show,
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};
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static struct attribute *default_hw_ctx_attrs[] = {
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&blk_mq_hw_sysfs_queued.attr,
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&blk_mq_hw_sysfs_run.attr,
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&blk_mq_hw_sysfs_dispatched.attr,
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&blk_mq_hw_sysfs_pending.attr,
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&blk_mq_hw_sysfs_tags.attr,
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&blk_mq_hw_sysfs_cpus.attr,
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&blk_mq_hw_sysfs_active.attr,
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NULL,
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};
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static const struct sysfs_ops blk_mq_sysfs_ops = {
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.show = blk_mq_sysfs_show,
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.store = blk_mq_sysfs_store,
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};
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static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
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.show = blk_mq_hw_sysfs_show,
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.store = blk_mq_hw_sysfs_store,
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};
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static struct kobj_type blk_mq_ktype = {
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.sysfs_ops = &blk_mq_sysfs_ops,
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.release = blk_mq_sysfs_release,
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};
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static struct kobj_type blk_mq_ctx_ktype = {
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.sysfs_ops = &blk_mq_sysfs_ops,
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.default_attrs = default_ctx_attrs,
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.release = blk_mq_ctx_release,
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};
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static struct kobj_type blk_mq_hw_ktype = {
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.sysfs_ops = &blk_mq_hw_sysfs_ops,
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.default_attrs = default_hw_ctx_attrs,
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.release = blk_mq_hctx_release,
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};
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static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
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{
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struct blk_mq_ctx *ctx;
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int i;
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if (!hctx->nr_ctx || !(hctx->flags & BLK_MQ_F_SYSFS_UP))
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return;
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hctx_for_each_ctx(hctx, ctx, i)
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kobject_del(&ctx->kobj);
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kobject_del(&hctx->kobj);
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}
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static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
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{
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struct request_queue *q = hctx->queue;
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struct blk_mq_ctx *ctx;
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int i, ret;
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if (!hctx->nr_ctx || !(hctx->flags & BLK_MQ_F_SYSFS_UP))
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return 0;
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ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
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if (ret)
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return ret;
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hctx_for_each_ctx(hctx, ctx, i) {
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kobject_get(&q->mq_kobj);
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ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
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if (ret)
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break;
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}
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return ret;
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}
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void blk_mq_unregister_disk(struct gendisk *disk)
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{
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struct request_queue *q = disk->queue;
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struct blk_mq_hw_ctx *hctx;
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struct blk_mq_ctx *ctx;
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int i, j;
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queue_for_each_hw_ctx(q, hctx, i) {
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blk_mq_unregister_hctx(hctx);
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hctx_for_each_ctx(hctx, ctx, j)
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kobject_put(&ctx->kobj);
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kobject_put(&hctx->kobj);
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}
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kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
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kobject_del(&q->mq_kobj);
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kobject_put(&q->mq_kobj);
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kobject_put(&disk_to_dev(disk)->kobj);
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}
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static void blk_mq_sysfs_init(struct request_queue *q)
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{
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struct blk_mq_hw_ctx *hctx;
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struct blk_mq_ctx *ctx;
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int i;
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kobject_init(&q->mq_kobj, &blk_mq_ktype);
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queue_for_each_hw_ctx(q, hctx, i)
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kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
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queue_for_each_ctx(q, ctx, i)
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kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
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}
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/* see blk_register_queue() */
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void blk_mq_finish_init(struct request_queue *q)
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{
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percpu_ref_switch_to_percpu(&q->mq_usage_counter);
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}
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int blk_mq_register_disk(struct gendisk *disk)
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{
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struct device *dev = disk_to_dev(disk);
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struct request_queue *q = disk->queue;
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struct blk_mq_hw_ctx *hctx;
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int ret, i;
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blk_mq_sysfs_init(q);
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ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
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if (ret < 0)
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return ret;
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kobject_uevent(&q->mq_kobj, KOBJ_ADD);
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queue_for_each_hw_ctx(q, hctx, i) {
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hctx->flags |= BLK_MQ_F_SYSFS_UP;
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ret = blk_mq_register_hctx(hctx);
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if (ret)
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break;
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}
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if (ret) {
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blk_mq_unregister_disk(disk);
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return ret;
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}
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return 0;
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}
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void blk_mq_sysfs_unregister(struct request_queue *q)
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{
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struct blk_mq_hw_ctx *hctx;
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int i;
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queue_for_each_hw_ctx(q, hctx, i)
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blk_mq_unregister_hctx(hctx);
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}
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int blk_mq_sysfs_register(struct request_queue *q)
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{
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struct blk_mq_hw_ctx *hctx;
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int i, ret = 0;
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queue_for_each_hw_ctx(q, hctx, i) {
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ret = blk_mq_register_hctx(hctx);
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|