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5f6224175f
Since commit ee6d3dd4ed ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.
Take advantage of this to constify the structure definitions to prevent
modification at runtime.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20230208-kobj_type-block-v1-1-0b3eafd7d983@weissschuh.net
Signed-off-by: Jens Axboe <axboe@kernel.dk>
312 lines
6.5 KiB
C
312 lines
6.5 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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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_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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};
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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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mutex_lock(&q->sysfs_lock);
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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_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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const size_t size = PAGE_SIZE - 1;
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unsigned int i, first = 1;
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int ret = 0, pos = 0;
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for_each_cpu(i, hctx->cpumask) {
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if (first)
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ret = snprintf(pos + page, size - pos, "%u", i);
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else
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ret = snprintf(pos + page, size - pos, ", %u", i);
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if (ret >= size - pos)
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break;
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first = 0;
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pos += ret;
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}
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ret = snprintf(pos + page, size + 1 - pos, "\n");
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return pos + 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_hw_sysfs_ops = {
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.show = blk_mq_hw_sysfs_show,
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};
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static const struct kobj_type blk_mq_ktype = {
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.release = blk_mq_sysfs_release,
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};
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static const struct kobj_type blk_mq_ctx_ktype = {
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.release = blk_mq_ctx_sysfs_release,
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};
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static const 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, j, 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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goto out;
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}
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return 0;
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out:
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hctx_for_each_ctx(hctx, ctx, j) {
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if (j < i)
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kobject_del(&ctx->kobj);
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}
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kobject_del(&hctx->kobj);
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return ret;
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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_sysfs_register(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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unsigned long i, j;
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int ret;
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lockdep_assert_held(&q->sysfs_dir_lock);
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ret = kobject_add(q->mq_kobj, &disk_to_dev(disk)->kobj, "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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queue_for_each_hw_ctx(q, hctx, j) {
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if (j < i)
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blk_mq_unregister_hctx(hctx);
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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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return ret;
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}
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void blk_mq_sysfs_unregister(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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unsigned long i;
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lockdep_assert_held(&q->sysfs_dir_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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q->mq_sysfs_init_done = false;
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}
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void blk_mq_sysfs_unregister_hctxs(struct request_queue *q)
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{
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struct blk_mq_hw_ctx *hctx;
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unsigned long i;
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mutex_lock(&q->sysfs_dir_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_dir_lock);
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}
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int blk_mq_sysfs_register_hctxs(struct request_queue *q)
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{
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struct blk_mq_hw_ctx *hctx;
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unsigned long i;
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int ret = 0;
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mutex_lock(&q->sysfs_dir_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_dir_lock);
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return ret;
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}
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