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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Linus Torvalds](/assets/img/avatar_default.png)
-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAlzR0AAQHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgpo0MD/47D1kBK9rGzkAwIz1Jkh1Qy/ITVaDJzmHJ UP5uncQsgKFLKMR1LbRcrWtmk2MwFDNULGbteHFeCYE1ypCrTgpWSp5+SJluKd1Q hma9krLSAXO9QiSaZ4jafshXFIZxz6IjakOW8c9LrT80Ze47yh7AxiLwDafcp/Jj x6NW790qB7ENDtfarDkZk14NCS8HGLRHO5B21LB+hT0Kfbh0XZaLzJdj7Mck1wPA VT8hL9mPuA++AjF7Ra4kUjwSakgmajTa3nS2fpkwTYdztQfas7x5Jiv7FWxrrelb qbabkNkWKepcHAPEiZR7o53TyfCucGeSK/jG+dsJ9KhNp26kl1ci3frl5T6PfVMP SPPDjsKIHs+dqFrU9y5rSGhLJqewTs96hHthnLGxyF67+5sRb5+YIy+dcqgiyc/b TUVyjCD6r0cO2q4v9VhwnhOyeBUA9Rwbu8nl7JV5Q45uG7qI4BC39l1jfubMNDPO GLNGUUzb6ER7z6lYINjRSF2Jhejsx8SR9P7jhpb1Q7k/VvDDxO1T4FpwvqWFz9+s Gn+s6//+cA6LL+42eZkQjvwF2CUNE7TaVT8zdb+s5HP1RQkZToqUnsQCGeRTrFni RqWXfW9o9+awYRp431417oMdX/LvLGq9+ZtifRk9DqDcowXevTaf0W2RpplWSuiX RcCuPeLAVg== =Ot0g -----END PGP SIGNATURE----- Merge tag 'for-5.2/block-20190507' of git://git.kernel.dk/linux-block Pull block updates from Jens Axboe: "Nothing major in this series, just fixes and improvements all over the map. This contains: - Series of fixes for sed-opal (David, Jonas) - Fixes and performance tweaks for BFQ (via Paolo) - Set of fixes for bcache (via Coly) - Set of fixes for md (via Song) - Enabling multi-page for passthrough requests (Ming) - Queue release fix series (Ming) - Device notification improvements (Martin) - Propagate underlying device rotational status in loop (Holger) - Removal of mtip32xx trim support, which has been disabled for years (Christoph) - Improvement and cleanup of nvme command handling (Christoph) - Add block SPDX tags (Christoph) - Cleanup/hardening of bio/bvec iteration (Christoph) - A few NVMe pull requests (Christoph) - Removal of CONFIG_LBDAF (Christoph) - Various little fixes here and there" * tag 'for-5.2/block-20190507' of git://git.kernel.dk/linux-block: (164 commits) block: fix mismerge in bvec_advance block: don't drain in-progress dispatch in blk_cleanup_queue() blk-mq: move cancel of hctx->run_work into blk_mq_hw_sysfs_release blk-mq: always free hctx after request queue is freed blk-mq: split blk_mq_alloc_and_init_hctx into two parts blk-mq: free hw queue's resource in hctx's release handler blk-mq: move cancel of requeue_work into blk_mq_release blk-mq: grab .q_usage_counter when queuing request from plug code path block: fix function name in comment nvmet: protect discovery change log event list iteration nvme: mark nvme_core_init and nvme_core_exit static nvme: move command size checks to the core nvme-fabrics: check more command sizes nvme-pci: check more command sizes nvme-pci: remove an unneeded variable initialization nvme-pci: unquiesce admin queue on shutdown nvme-pci: shutdown on timeout during deletion nvme-pci: fix psdt field for single segment sgls nvme-multipath: don't print ANA group state by default nvme-multipath: split bios with the ns_head bio_set before submitting ...
398 lines
8.6 KiB
C
398 lines
8.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#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.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 blk_mq_ctxs *ctxs = container_of(kobj, struct blk_mq_ctxs, kobj);
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free_percpu(ctxs->queue_ctx);
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kfree(ctxs);
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}
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static void blk_mq_ctx_sysfs_release(struct kobject *kobj)
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{
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struct blk_mq_ctx *ctx = container_of(kobj, struct blk_mq_ctx, kobj);
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/* ctx->ctxs won't be released until all ctx are freed */
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kobject_put(&ctx->ctxs->kobj);
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}
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static void blk_mq_hw_sysfs_release(struct kobject *kobj)
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{
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struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
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kobj);
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cancel_delayed_work_sync(&hctx->run_work);
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if (hctx->flags & BLK_MQ_F_BLOCKING)
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cleanup_srcu_struct(hctx->srcu);
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blk_free_flush_queue(hctx->fq);
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sbitmap_free(&hctx->ctx_map);
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free_cpumask_var(hctx->cpumask);
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kfree(hctx->ctxs);
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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_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
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char *page)
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{
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return sprintf(page, "%u\n", hctx->tags->nr_tags);
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}
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static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
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char *page)
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{
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return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
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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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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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ret += sprintf(ret + page, "\n");
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return ret;
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}
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
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.attr = {.name = "nr_tags", .mode = 0444 },
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.show = blk_mq_hw_sysfs_nr_tags_show,
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};
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static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
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.attr = {.name = "nr_reserved_tags", .mode = 0444 },
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.show = blk_mq_hw_sysfs_nr_reserved_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 = 0444 },
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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_nr_tags.attr,
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&blk_mq_hw_sysfs_nr_reserved_tags.attr,
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&blk_mq_hw_sysfs_cpus.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(default_hw_ctx);
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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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.release = blk_mq_ctx_sysfs_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_groups = default_hw_ctx_groups,
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.release = blk_mq_hw_sysfs_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)
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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)
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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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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_dev(struct device *dev, 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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lockdep_assert_held(&q->sysfs_lock);
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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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kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
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kobject_del(q->mq_kobj);
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kobject_put(&dev->kobj);
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q->mq_sysfs_init_done = false;
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}
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void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
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{
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kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
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}
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void blk_mq_sysfs_deinit(struct request_queue *q)
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{
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struct blk_mq_ctx *ctx;
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int cpu;
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for_each_possible_cpu(cpu) {
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ctx = per_cpu_ptr(q->queue_ctx, cpu);
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kobject_put(&ctx->kobj);
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}
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kobject_put(q->mq_kobj);
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}
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void blk_mq_sysfs_init(struct request_queue *q)
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{
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struct blk_mq_ctx *ctx;
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int cpu;
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kobject_init(q->mq_kobj, &blk_mq_ktype);
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for_each_possible_cpu(cpu) {
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ctx = per_cpu_ptr(q->queue_ctx, cpu);
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kobject_get(q->mq_kobj);
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kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
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}
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}
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int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
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{
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struct blk_mq_hw_ctx *hctx;
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int ret, i;
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WARN_ON_ONCE(!q->kobj.parent);
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lockdep_assert_held(&q->sysfs_lock);
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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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goto out;
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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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ret = blk_mq_register_hctx(hctx);
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if (ret)
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goto unreg;
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}
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q->mq_sysfs_init_done = true;
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out:
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return ret;
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unreg:
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while (--i >= 0)
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blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
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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(&dev->kobj);
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return ret;
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}
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int blk_mq_register_dev(struct device *dev, struct request_queue *q)
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{
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int ret;
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mutex_lock(&q->sysfs_lock);
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ret = __blk_mq_register_dev(dev, q);
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mutex_unlock(&q->sysfs_lock);
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return ret;
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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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mutex_lock(&q->sysfs_lock);
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if (!q->mq_sysfs_init_done)
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goto unlock;
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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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unlock:
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mutex_unlock(&q->sysfs_lock);
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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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mutex_lock(&q->sysfs_lock);
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if (!q->mq_sysfs_init_done)
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goto unlock;
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queue_for_each_hw_ctx(q, hctx, i) {
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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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unlock:
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mutex_unlock(&q->sysfs_lock);
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return ret;
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}
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