*/
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/random.h>
#include <linux/blk-mq.h>
#include "blk.h"
return atomic_read(&hctx->nr_active) < depth;
}
-#define BT_ALLOC_RR(tags) (tags->alloc_policy == BLK_TAG_ALLOC_RR)
-
-static int __bt_get(struct blk_mq_hw_ctx *hctx, struct sbitmap_queue *bt,
- unsigned int *tag_cache, struct blk_mq_tags *tags)
+static int __bt_get(struct blk_mq_hw_ctx *hctx, struct sbitmap_queue *bt)
{
- unsigned int last_tag;
- int tag;
-
if (!hctx_may_queue(hctx, bt))
return -1;
-
- last_tag = *tag_cache;
- tag = sbitmap_get(&bt->sb, last_tag, BT_ALLOC_RR(tags));
-
- if (tag == -1) {
- *tag_cache = 0;
- } else if (tag == last_tag || unlikely(BT_ALLOC_RR(tags))) {
- last_tag = tag + 1;
- if (last_tag >= bt->sb.depth - 1)
- last_tag = 0;
- *tag_cache = last_tag;
- }
-
- return tag;
+ return __sbitmap_queue_get(bt);
}
-static int bt_get(struct blk_mq_alloc_data *data,
- struct sbitmap_queue *bt,
- struct blk_mq_hw_ctx *hctx,
- unsigned int *last_tag, struct blk_mq_tags *tags)
+static int bt_get(struct blk_mq_alloc_data *data, struct sbitmap_queue *bt,
+ struct blk_mq_hw_ctx *hctx, struct blk_mq_tags *tags)
{
struct sbq_wait_state *ws;
DEFINE_WAIT(wait);
int tag;
- tag = __bt_get(hctx, bt, last_tag, tags);
+ tag = __bt_get(hctx, bt);
if (tag != -1)
return tag;
do {
prepare_to_wait(&ws->wait, &wait, TASK_UNINTERRUPTIBLE);
- tag = __bt_get(hctx, bt, last_tag, tags);
+ tag = __bt_get(hctx, bt);
if (tag != -1)
break;
* Retry tag allocation after running the hardware queue,
* as running the queue may also have found completions.
*/
- tag = __bt_get(hctx, bt, last_tag, tags);
+ tag = __bt_get(hctx, bt);
if (tag != -1)
break;
io_schedule();
data->ctx = blk_mq_get_ctx(data->q);
- data->hctx = data->q->mq_ops->map_queue(data->q,
- data->ctx->cpu);
+ data->hctx = blk_mq_map_queue(data->q, data->ctx->cpu);
if (data->flags & BLK_MQ_REQ_RESERVED) {
bt = &data->hctx->tags->breserved_tags;
} else {
- last_tag = &data->ctx->last_tag;
hctx = data->hctx;
bt = &hctx->tags->bitmap_tags;
}
int tag;
tag = bt_get(data, &data->hctx->tags->bitmap_tags, data->hctx,
- &data->ctx->last_tag, data->hctx->tags);
+ data->hctx->tags);
if (tag >= 0)
return tag + data->hctx->tags->nr_reserved_tags;
static unsigned int __blk_mq_get_reserved_tag(struct blk_mq_alloc_data *data)
{
- int tag, zero = 0;
+ int tag;
if (unlikely(!data->hctx->tags->nr_reserved_tags)) {
WARN_ON_ONCE(1);
return BLK_MQ_TAG_FAIL;
}
- tag = bt_get(data, &data->hctx->tags->breserved_tags, NULL, &zero,
- data->hctx->tags);
+ tag = bt_get(data, &data->hctx->tags->breserved_tags, NULL,
+ data->hctx->tags);
if (tag < 0)
return BLK_MQ_TAG_FAIL;
return __blk_mq_get_tag(data);
}
-void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag,
- unsigned int *last_tag)
+void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
+ unsigned int tag)
{
struct blk_mq_tags *tags = hctx->tags;
const int real_tag = tag - tags->nr_reserved_tags;
BUG_ON(real_tag >= tags->nr_tags);
- sbitmap_queue_clear(&tags->bitmap_tags, real_tag);
- if (likely(tags->alloc_policy == BLK_TAG_ALLOC_FIFO))
- *last_tag = real_tag;
+ sbitmap_queue_clear(&tags->bitmap_tags, real_tag, ctx->cpu);
} else {
BUG_ON(tag >= tags->nr_reserved_tags);
- sbitmap_queue_clear(&tags->breserved_tags, tag);
+ sbitmap_queue_clear(&tags->breserved_tags, tag, ctx->cpu);
}
}
return bt->sb.depth - sbitmap_weight(&bt->sb);
}
-static int bt_alloc(struct sbitmap_queue *bt, unsigned int depth, int node)
+static int bt_alloc(struct sbitmap_queue *bt, unsigned int depth,
+ bool round_robin, int node)
{
- return sbitmap_queue_init_node(bt, depth, -1, GFP_KERNEL, node);
+ return sbitmap_queue_init_node(bt, depth, -1, round_robin, GFP_KERNEL,
+ node);
}
static struct blk_mq_tags *blk_mq_init_bitmap_tags(struct blk_mq_tags *tags,
int node, int alloc_policy)
{
unsigned int depth = tags->nr_tags - tags->nr_reserved_tags;
+ bool round_robin = alloc_policy == BLK_TAG_ALLOC_RR;
- tags->alloc_policy = alloc_policy;
-
- if (bt_alloc(&tags->bitmap_tags, depth, node))
+ if (bt_alloc(&tags->bitmap_tags, depth, round_robin, node))
goto free_tags;
- if (bt_alloc(&tags->breserved_tags, tags->nr_reserved_tags, node))
+ if (bt_alloc(&tags->breserved_tags, tags->nr_reserved_tags, round_robin,
+ node))
goto free_bitmap_tags;
return tags;
if (!tags)
return NULL;
- if (!zalloc_cpumask_var(&tags->cpumask, GFP_KERNEL)) {
- kfree(tags);
- return NULL;
- }
-
tags->nr_tags = total_tags;
tags->nr_reserved_tags = reserved_tags;
{
sbitmap_queue_free(&tags->bitmap_tags);
sbitmap_queue_free(&tags->breserved_tags);
- free_cpumask_var(tags->cpumask);
kfree(tags);
}
-void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *tag)
-{
- unsigned int depth = tags->nr_tags - tags->nr_reserved_tags;
-
- *tag = prandom_u32() % depth;
-}
-
int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int tdepth)
{
tdepth -= tags->nr_reserved_tags;
int hwq = 0;
if (q->mq_ops) {
- hctx = q->mq_ops->map_queue(q, rq->mq_ctx->cpu);
+ hctx = blk_mq_map_queue(q, rq->mq_ctx->cpu);
hwq = hctx->queue_num;
}