Quelle blk-mq-sysfs.c Sprache: C

// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/backing-dev.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include <linux/smp.h>

#include "blk.h"
#include "blk-mq.h"

static void blk_mq_sysfs_release(struct kobject *kobj)
{
struct blk_mq_ctxs *ctxs = container_of(kobj, struct blk_mq_ctxs, kobj);

free_percpu(ctxs->queue_ctx);
kfree(ctxs);
}

static void blk_mq_ctx_sysfs_release(struct kobject *kobj)
{
struct blk_mq_ctx *ctx = container_of(kobj, struct blk_mq_ctx, kobj);

/* ctx->ctxs won't be released until all ctx are freed */
kobject_put(&ctx->ctxs->kobj);
}

static void blk_mq_hw_sysfs_release(struct kobject *kobj)
{
struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
        kobj);

blk_free_flush_queue(hctx->fq);
sbitmap_free(&hctx->ctx_map);
free_cpumask_var(hctx->cpumask);
kfree(hctx->ctxs);
kfree(hctx);
}

struct blk_mq_hw_ctx_sysfs_entry {
struct attribute attr;
ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
};

static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
        struct attribute *attr, char *page)
{
struct blk_mq_hw_ctx_sysfs_entry *entry;
struct blk_mq_hw_ctx *hctx;
struct request_queue *q;
ssize_t res;

entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
q = hctx->queue;

if (!entry->show)
  return -EIO;

mutex_lock(&q->elevator_lock);
res = entry->show(hctx, page);
mutex_unlock(&q->elevator_lock);
return res;
}

static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
         char *page)
{
return sprintf(page, "%u\n", hctx->tags->nr_tags);
}

static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
           char *page)
{
return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
}

static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
{
const size_t size = PAGE_SIZE - 1;
unsigned int i, first = 1;
int ret = 0, pos = 0;

for_each_cpu(i, hctx->cpumask) {
  if (first)
   ret = snprintf(pos + page, size - pos, "%u", i);
  else
   ret = snprintf(pos + page, size - pos, ", %u", i);

  if (ret >= size - pos)
   break;

  first = 0;
  pos += ret;
}

ret = snprintf(pos + page, size + 1 - pos, "\n");
return pos + ret;
}

static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
.attr = {.name = "nr_tags", .mode = 0444 },
.show = blk_mq_hw_sysfs_nr_tags_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
.attr = {.name = "nr_reserved_tags", .mode = 0444 },
.show = blk_mq_hw_sysfs_nr_reserved_tags_show,
};
static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
.attr = {.name = "cpu_list", .mode = 0444 },
.show = blk_mq_hw_sysfs_cpus_show,
};

static struct attribute *default_hw_ctx_attrs[] = {
&blk_mq_hw_sysfs_nr_tags.attr,
&blk_mq_hw_sysfs_nr_reserved_tags.attr,
&blk_mq_hw_sysfs_cpus.attr,
NULL,
};
ATTRIBUTE_GROUPS(default_hw_ctx);

static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
.show = blk_mq_hw_sysfs_show,
};

static const struct kobj_type blk_mq_ktype = {
.release = blk_mq_sysfs_release,
};

static const struct kobj_type blk_mq_ctx_ktype = {
.release = blk_mq_ctx_sysfs_release,
};

static const struct kobj_type blk_mq_hw_ktype = {
.sysfs_ops = &blk_mq_hw_sysfs_ops,
.default_groups = default_hw_ctx_groups,
.release = blk_mq_hw_sysfs_release,
};

static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
{
struct blk_mq_ctx *ctx;
int i;

if (!hctx->nr_ctx)
  return;

hctx_for_each_ctx(hctx, ctx, i)
  if (ctx->kobj.state_in_sysfs)
   kobject_del(&ctx->kobj);

if (hctx->kobj.state_in_sysfs)
  kobject_del(&hctx->kobj);
}

static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
{
struct request_queue *q = hctx->queue;
struct blk_mq_ctx *ctx;
int i, j, ret;

if (!hctx->nr_ctx)
  return 0;

ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num);
if (ret)
  return ret;

hctx_for_each_ctx(hctx, ctx, i) {
  ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
  if (ret)
   goto out;
}

return 0;
out:
hctx_for_each_ctx(hctx, ctx, j) {
  if (j < i)
   kobject_del(&ctx->kobj);
}
kobject_del(&hctx->kobj);
return ret;
}

void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
{
kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
}

void blk_mq_sysfs_deinit(struct request_queue *q)
{
struct blk_mq_ctx *ctx;
int cpu;

for_each_possible_cpu(cpu) {
  ctx = per_cpu_ptr(q->queue_ctx, cpu);
  kobject_put(&ctx->kobj);
}
kobject_put(q->mq_kobj);
}

void blk_mq_sysfs_init(struct request_queue *q)
{
struct blk_mq_ctx *ctx;
int cpu;

kobject_init(q->mq_kobj, &blk_mq_ktype);

for_each_possible_cpu(cpu) {
  ctx = per_cpu_ptr(q->queue_ctx, cpu);

  kobject_get(q->mq_kobj);
  kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
}
}

int blk_mq_sysfs_register(struct gendisk *disk)
{
struct request_queue *q = disk->queue;
struct blk_mq_hw_ctx *hctx;
unsigned long i, j;
int ret;

ret = kobject_add(q->mq_kobj, &disk_to_dev(disk)->kobj, "mq");
if (ret < 0)
  return ret;

kobject_uevent(q->mq_kobj, KOBJ_ADD);

mutex_lock(&q->tag_set->tag_list_lock);
queue_for_each_hw_ctx(q, hctx, i) {
  ret = blk_mq_register_hctx(hctx);
  if (ret)
   goto out_unreg;
}
mutex_unlock(&q->tag_set->tag_list_lock);
return 0;

out_unreg:
queue_for_each_hw_ctx(q, hctx, j) {
  if (j < i)
   blk_mq_unregister_hctx(hctx);
}
mutex_unlock(&q->tag_set->tag_list_lock);

kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
kobject_del(q->mq_kobj);
return ret;
}

void blk_mq_sysfs_unregister(struct gendisk *disk)
{
struct request_queue *q = disk->queue;
struct blk_mq_hw_ctx *hctx;
unsigned long i;

mutex_lock(&q->tag_set->tag_list_lock);
queue_for_each_hw_ctx(q, hctx, i)
  blk_mq_unregister_hctx(hctx);
mutex_unlock(&q->tag_set->tag_list_lock);

kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
kobject_del(q->mq_kobj);
}

void blk_mq_sysfs_unregister_hctxs(struct request_queue *q)
{
struct blk_mq_hw_ctx *hctx;
unsigned long i;

if (!blk_queue_registered(q))
  return;

queue_for_each_hw_ctx(q, hctx, i)
  blk_mq_unregister_hctx(hctx);
}

int blk_mq_sysfs_register_hctxs(struct request_queue *q)
{
struct blk_mq_hw_ctx *hctx;
unsigned long i;
int ret = 0;

if (!blk_queue_registered(q))
  goto out;

queue_for_each_hw_ctx(q, hctx, i) {
  ret = blk_mq_register_hctx(hctx);
  if (ret)
   break;
}

out:
return ret;
}

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