--- /dev/null
+#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 <linux/blk-mq.h>
+#include "blk-mq.h"
+#include "blk-mq-tag.h"
+
+static void blk_mq_sysfs_release(struct kobject *kobj)
+{
+}
+
+struct blk_mq_ctx_sysfs_entry {
+ struct attribute attr;
+ ssize_t (*show)(struct blk_mq_ctx *, char *);
+ ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t);
+};
+
+struct blk_mq_hw_ctx_sysfs_entry {
+ struct attribute attr;
+ ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
+ ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t);
+};
+
+static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
+ char *page)
+{
+ struct blk_mq_ctx_sysfs_entry *entry;
+ struct blk_mq_ctx *ctx;
+ struct request_queue *q;
+ ssize_t res;
+
+ entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
+ ctx = container_of(kobj, struct blk_mq_ctx, kobj);
+ q = ctx->queue;
+
+ if (!entry->show)
+ return -EIO;
+
+ res = -ENOENT;
+ mutex_lock(&q->sysfs_lock);
+ if (!blk_queue_dying(q))
+ res = entry->show(ctx, page);
+ mutex_unlock(&q->sysfs_lock);
+ return res;
+}
+
+static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
+ const char *page, size_t length)
+{
+ struct blk_mq_ctx_sysfs_entry *entry;
+ struct blk_mq_ctx *ctx;
+ struct request_queue *q;
+ ssize_t res;
+
+ entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
+ ctx = container_of(kobj, struct blk_mq_ctx, kobj);
+ q = ctx->queue;
+
+ if (!entry->store)
+ return -EIO;
+
+ res = -ENOENT;
+ mutex_lock(&q->sysfs_lock);
+ if (!blk_queue_dying(q))
+ res = entry->store(ctx, page, length);
+ mutex_unlock(&q->sysfs_lock);
+ return res;
+}
+
+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;
+
+ res = -ENOENT;
+ mutex_lock(&q->sysfs_lock);
+ if (!blk_queue_dying(q))
+ res = entry->show(hctx, page);
+ mutex_unlock(&q->sysfs_lock);
+ return res;
+}
+
+static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
+ struct attribute *attr, const char *page,
+ size_t length)
+{
+ 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->store)
+ return -EIO;
+
+ res = -ENOENT;
+ mutex_lock(&q->sysfs_lock);
+ if (!blk_queue_dying(q))
+ res = entry->store(hctx, page, length);
+ mutex_unlock(&q->sysfs_lock);
+ return res;
+}
+
+static ssize_t blk_mq_sysfs_dispatched_show(struct blk_mq_ctx *ctx, char *page)
+{
+ return sprintf(page, "%lu %lu\n", ctx->rq_dispatched[1],
+ ctx->rq_dispatched[0]);
+}
+
+static ssize_t blk_mq_sysfs_merged_show(struct blk_mq_ctx *ctx, char *page)
+{
+ return sprintf(page, "%lu\n", ctx->rq_merged);
+}
+
+static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx *ctx, char *page)
+{
+ return sprintf(page, "%lu %lu\n", ctx->rq_completed[1],
+ ctx->rq_completed[0]);
+}
+
+static ssize_t sysfs_list_show(char *page, struct list_head *list, char *msg)
+{
+ char *start_page = page;
+ struct request *rq;
+
+ page += sprintf(page, "%s:\n", msg);
+
+ list_for_each_entry(rq, list, queuelist)
+ page += sprintf(page, "\t%p\n", rq);
+
+ return page - start_page;
+}
+
+static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page)
+{
+ ssize_t ret;
+
+ spin_lock(&ctx->lock);
+ ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending");
+ spin_unlock(&ctx->lock);
+
+ return ret;
+}
+
+static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
+ char *page)
+{
+ return sprintf(page, "%lu\n", hctx->queued);
+}
+
+static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page)
+{
+ return sprintf(page, "%lu\n", hctx->run);
+}
+
+static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx,
+ char *page)
+{
+ char *start_page = page;
+ int i;
+
+ page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
+
+ for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) {
+ unsigned long d = 1U << (i - 1);
+
+ page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]);
+ }
+
+ return page - start_page;
+}
+
+static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx,
+ char *page)
+{
+ ssize_t ret;
+
+ spin_lock(&hctx->lock);
+ ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending");
+ spin_unlock(&hctx->lock);
+
+ return ret;
+}
+
+static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page)
+{
+ return blk_mq_tag_sysfs_show(hctx->tags, page);
+}
+
+static ssize_t blk_mq_hw_sysfs_active_show(struct blk_mq_hw_ctx *hctx, char *page)
+{
+ return sprintf(page, "%u\n", atomic_read(&hctx->nr_active));
+}
+
+static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
+{
+ unsigned int i, first = 1;
+ ssize_t ret = 0;
+
+ blk_mq_disable_hotplug();
+
+ for_each_cpu(i, hctx->cpumask) {
+ if (first)
+ ret += sprintf(ret + page, "%u", i);
+ else
+ ret += sprintf(ret + page, ", %u", i);
+
+ first = 0;
+ }
+
+ blk_mq_enable_hotplug();
+
+ ret += sprintf(ret + page, "\n");
+ return ret;
+}
+
+static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = {
+ .attr = {.name = "dispatched", .mode = S_IRUGO },
+ .show = blk_mq_sysfs_dispatched_show,
+};
+static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = {
+ .attr = {.name = "merged", .mode = S_IRUGO },
+ .show = blk_mq_sysfs_merged_show,
+};
+static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = {
+ .attr = {.name = "completed", .mode = S_IRUGO },
+ .show = blk_mq_sysfs_completed_show,
+};
+static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = {
+ .attr = {.name = "rq_list", .mode = S_IRUGO },
+ .show = blk_mq_sysfs_rq_list_show,
+};
+
+static struct attribute *default_ctx_attrs[] = {
+ &blk_mq_sysfs_dispatched.attr,
+ &blk_mq_sysfs_merged.attr,
+ &blk_mq_sysfs_completed.attr,
+ &blk_mq_sysfs_rq_list.attr,
+ NULL,
+};
+
+static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = {
+ .attr = {.name = "queued", .mode = S_IRUGO },
+ .show = blk_mq_hw_sysfs_queued_show,
+};
+static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = {
+ .attr = {.name = "run", .mode = S_IRUGO },
+ .show = blk_mq_hw_sysfs_run_show,
+};
+static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = {
+ .attr = {.name = "dispatched", .mode = S_IRUGO },
+ .show = blk_mq_hw_sysfs_dispatched_show,
+};
+static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_active = {
+ .attr = {.name = "active", .mode = S_IRUGO },
+ .show = blk_mq_hw_sysfs_active_show,
+};
+static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = {
+ .attr = {.name = "pending", .mode = S_IRUGO },
+ .show = blk_mq_hw_sysfs_rq_list_show,
+};
+static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = {
+ .attr = {.name = "tags", .mode = S_IRUGO },
+ .show = blk_mq_hw_sysfs_tags_show,
+};
+static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
+ .attr = {.name = "cpu_list", .mode = S_IRUGO },
+ .show = blk_mq_hw_sysfs_cpus_show,
+};
+
+static struct attribute *default_hw_ctx_attrs[] = {
+ &blk_mq_hw_sysfs_queued.attr,
+ &blk_mq_hw_sysfs_run.attr,
+ &blk_mq_hw_sysfs_dispatched.attr,
+ &blk_mq_hw_sysfs_pending.attr,
+ &blk_mq_hw_sysfs_tags.attr,
+ &blk_mq_hw_sysfs_cpus.attr,
+ &blk_mq_hw_sysfs_active.attr,
+ NULL,
+};
+
+static const struct sysfs_ops blk_mq_sysfs_ops = {
+ .show = blk_mq_sysfs_show,
+ .store = blk_mq_sysfs_store,
+};
+
+static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
+ .show = blk_mq_hw_sysfs_show,
+ .store = blk_mq_hw_sysfs_store,
+};
+
+static struct kobj_type blk_mq_ktype = {
+ .sysfs_ops = &blk_mq_sysfs_ops,
+ .release = blk_mq_sysfs_release,
+};
+
+static struct kobj_type blk_mq_ctx_ktype = {
+ .sysfs_ops = &blk_mq_sysfs_ops,
+ .default_attrs = default_ctx_attrs,
+ .release = blk_mq_sysfs_release,
+};
+
+static struct kobj_type blk_mq_hw_ktype = {
+ .sysfs_ops = &blk_mq_hw_sysfs_ops,
+ .default_attrs = default_hw_ctx_attrs,
+ .release = blk_mq_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 || !(hctx->flags & BLK_MQ_F_SYSFS_UP))
+ return;
+
+ hctx_for_each_ctx(hctx, ctx, i)
+ kobject_del(&ctx->kobj);
+
+ 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, ret;
+
+ if (!hctx->nr_ctx || !(hctx->flags & BLK_MQ_F_SYSFS_UP))
+ 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)
+ break;
+ }
+
+ return ret;
+}
+
+void blk_mq_unregister_disk(struct gendisk *disk)
+{
+ struct request_queue *q = disk->queue;
+ struct blk_mq_hw_ctx *hctx;
+ struct blk_mq_ctx *ctx;
+ int i, j;
+
+ queue_for_each_hw_ctx(q, hctx, i) {
+ blk_mq_unregister_hctx(hctx);
+
+ hctx_for_each_ctx(hctx, ctx, j)
+ kobject_put(&ctx->kobj);
+
+ kobject_put(&hctx->kobj);
+ }
+
+ kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
+ kobject_del(&q->mq_kobj);
+ kobject_put(&q->mq_kobj);
+
+ kobject_put(&disk_to_dev(disk)->kobj);
+}
+
+static void blk_mq_sysfs_init(struct request_queue *q)
+{
+ struct blk_mq_hw_ctx *hctx;
+ struct blk_mq_ctx *ctx;
+ int i;
+
+ kobject_init(&q->mq_kobj, &blk_mq_ktype);
+
+ queue_for_each_hw_ctx(q, hctx, i)
+ kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
+
+ queue_for_each_ctx(q, ctx, i)
+ kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
+}
+
+/* see blk_register_queue() */
+void blk_mq_finish_init(struct request_queue *q)
+{
+ percpu_ref_switch_to_percpu(&q->mq_usage_counter);
+}
+
+int blk_mq_register_disk(struct gendisk *disk)
+{
+ struct device *dev = disk_to_dev(disk);
+ struct request_queue *q = disk->queue;
+ struct blk_mq_hw_ctx *hctx;
+ int ret, i;
+
+ blk_mq_sysfs_init(q);
+
+ ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
+ if (ret < 0)
+ return ret;
+
+ kobject_uevent(&q->mq_kobj, KOBJ_ADD);
+
+ queue_for_each_hw_ctx(q, hctx, i) {
+ hctx->flags |= BLK_MQ_F_SYSFS_UP;
+ ret = blk_mq_register_hctx(hctx);
+ if (ret)
+ break;
+ }
+
+ if (ret) {
+ blk_mq_unregister_disk(disk);
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(blk_mq_register_disk);
+
+void blk_mq_sysfs_unregister(struct request_queue *q)
+{
+ struct blk_mq_hw_ctx *hctx;
+ int i;
+
+ queue_for_each_hw_ctx(q, hctx, i)
+ blk_mq_unregister_hctx(hctx);
+}
+
+int blk_mq_sysfs_register(struct request_queue *q)
+{
+ struct blk_mq_hw_ctx *hctx;
+ int i, ret = 0;
+
+ queue_for_each_hw_ctx(q, hctx, i) {
+ ret = blk_mq_register_hctx(hctx);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
Code Review / kvmfornfv.git / blobdiff