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Date: Mon, 31 Mar 2014 16:46:15 +0200
From: Christoph Hellwig <hch@....de>
To: Jens Axboe <axboe@...com>
Cc: Matias Bjorling <m@...rling.me>, linux-kernel@...r.kernel.org,
linux-scsi@...r.kernel.org
Subject: [PATCH 4/4] blk-mq: support shared tag maps
---
block/blk-mq-tag.c | 2 ++
block/blk-mq.c | 83 +++++++++++++++++++++++++++++++++++++++++++-----
block/blk-mq.h | 2 ++
include/linux/blk-mq.h | 12 +++++++
4 files changed, 91 insertions(+), 8 deletions(-)
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 108f82b..a7b1888 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -121,6 +121,8 @@ struct blk_mq_tags *blk_mq_init_tags(unsigned int total_tags,
if (!tags)
return NULL;
+ kref_init(&tags->ref_count);
+
nr_tags = total_tags - reserved_tags;
nr_cache = nr_tags / num_possible_cpus();
diff --git a/block/blk-mq.c b/block/blk-mq.c
index f1b5d52..3d63d71 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1051,8 +1051,10 @@ void blk_mq_free_commands(struct request_queue *q,
}
EXPORT_SYMBOL(blk_mq_free_commands);
-static void blk_mq_free_rq_map(struct blk_mq_tags *tags)
+static void blk_mq_free_rq_map(struct kref *kref)
{
+ struct blk_mq_tags *tags =
+ container_of(kref, struct blk_mq_tags, ref_count);
struct page *page;
while (!list_empty(&tags->page_list)) {
@@ -1066,6 +1068,17 @@ static void blk_mq_free_rq_map(struct blk_mq_tags *tags)
blk_mq_free_tags(tags);
}
+static void blk_mq_put_rq_map(struct blk_mq_tags *tags)
+{
+ kref_put(&tags->ref_count, blk_mq_free_rq_map);
+}
+
+static struct blk_mq_tags *blk_mq_get_rq_map(struct blk_mq_tags *tags)
+{
+ kref_get(&tags->ref_count);
+ return tags;
+}
+
static size_t order_to_size(unsigned int order)
{
size_t ret = PAGE_SIZE;
@@ -1144,7 +1157,7 @@ static struct blk_mq_tags *blk_mq_init_rq_map(unsigned int total_tags,
fail:
pr_warn("%s: failed to allocate requests\n", __func__);
- blk_mq_free_rq_map(tags);
+ blk_mq_put_rq_map(tags);
return NULL;
}
@@ -1178,10 +1191,14 @@ static int blk_mq_init_hw_queues(struct request_queue *q,
blk_mq_hctx_notify, hctx);
blk_mq_register_cpu_notifier(&hctx->cpu_notifier);
- hctx->tags = blk_mq_init_rq_map(hctx->queue_depth,
- reg->reserved_tags, reg->cmd_size, node);
- if (!hctx->tags)
- break;
+ if (reg->shared_tags) {
+ hctx->tags = blk_mq_get_rq_map(reg->shared_tags->tags[i]);
+ } else {
+ hctx->tags = blk_mq_init_rq_map(hctx->queue_depth,
+ reg->reserved_tags, reg->cmd_size, node);
+ if (!hctx->tags)
+ break;
+ }
/*
* Allocate space for all possible cpus to avoid allocation in
@@ -1221,7 +1238,7 @@ static int blk_mq_init_hw_queues(struct request_queue *q,
blk_mq_unregister_cpu_notifier(&hctx->cpu_notifier);
if (hctx->tags)
- blk_mq_free_rq_map(hctx->tags);
+ blk_mq_put_rq_map(hctx->tags);
kfree(hctx->ctxs);
}
@@ -1399,7 +1416,7 @@ void blk_mq_free_queue(struct request_queue *q)
kfree(hctx->ctx_map);
kfree(hctx->ctxs);
if (hctx->tags)
- blk_mq_free_rq_map(hctx->tags);
+ blk_mq_put_rq_map(hctx->tags);
blk_mq_unregister_cpu_notifier(&hctx->cpu_notifier);
if (q->mq_ops->exit_hctx)
q->mq_ops->exit_hctx(hctx, i);
@@ -1459,6 +1476,56 @@ static int blk_mq_queue_reinit_notify(struct notifier_block *nb,
return NOTIFY_OK;
}
+struct blk_mq_shared_tags *blk_mq_alloc_shared_tags(struct blk_mq_reg *reg,
+ int (*init)(void *, struct request *), void *data)
+{
+ struct blk_mq_shared_tags *shared_tags;
+ int i, j;
+
+ shared_tags = kmalloc_node(sizeof(*shared_tags) +
+ reg->nr_hw_queues * sizeof(struct blk_mq_tags),
+ GFP_KERNEL, reg->numa_node);
+ if (!shared_tags)
+ goto out;
+
+ shared_tags->nr_hw_queues = reg->nr_hw_queues;
+ shared_tags->queue_depth = reg->queue_depth;
+ for (i = 0; i < reg->nr_hw_queues; i++) {
+ shared_tags->tags[i] = blk_mq_init_rq_map(reg->queue_depth,
+ reg->reserved_tags, reg->cmd_size, reg->numa_node);
+ if (!shared_tags->tags[i])
+ goto out_unwind;
+
+ for (j = 0; j < reg->queue_depth; j++) {
+ struct request *rq = shared_tags->tags[i]->rqs[j];
+ int ret;
+
+ ret = init(data, rq);
+ BUG_ON(ret);
+ }
+ }
+
+ return shared_tags;
+
+out_unwind:
+ while (--i >= 0)
+ blk_mq_put_rq_map(shared_tags->tags[i]);
+out:
+ return NULL;
+}
+
+void blk_mq_free_shared_tags(struct blk_mq_shared_tags *shared_tags,
+ void (*exit)(void *, struct request *), void *data)
+{
+ int i, j;
+
+ for (i = 0; i < shared_tags->nr_hw_queues; i++) {
+ for (j = 0; j < shared_tags->queue_depth; j++)
+ exit(data, shared_tags->tags[i]->rqs[j]);
+ blk_mq_put_rq_map(shared_tags->tags[i]);
+ }
+}
+
void blk_mq_disable_hotplug(void)
{
mutex_lock(&all_q_mutex);
diff --git a/block/blk-mq.h b/block/blk-mq.h
index eca3a47..d7c753b 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -17,6 +17,8 @@ struct blk_mq_tags {
struct request **rqs;
struct list_head page_list;
+
+ struct kref ref_count;
};
struct blk_mq_ctx {
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 69aa3ad..a564167 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -47,6 +47,12 @@ struct blk_mq_hw_ctx {
struct kobject kobj;
};
+struct blk_mq_shared_tags {
+ unsigned int nr_hw_queues;
+ unsigned int queue_depth;
+ struct blk_mq_tags *tags[];
+};
+
struct blk_mq_reg {
struct blk_mq_ops *ops;
unsigned int nr_hw_queues;
@@ -56,6 +62,7 @@ struct blk_mq_reg {
int numa_node;
unsigned int timeout;
unsigned int flags; /* BLK_MQ_F_* */
+ struct blk_mq_shared_tags *shared_tags;
};
typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *);
@@ -118,6 +125,11 @@ void blk_mq_unregister_disk(struct gendisk *);
int blk_mq_init_commands(struct request_queue *, int (*init)(void *data, struct blk_mq_hw_ctx *, struct request *, unsigned int), void *data);
void blk_mq_free_commands(struct request_queue *, void (*free)(void *data, struct blk_mq_hw_ctx *, struct request *, unsigned int), void *data);
+struct blk_mq_shared_tags *blk_mq_alloc_shared_tags(struct blk_mq_reg *reg,
+ int (*init)(void *, struct request *), void *data);
+void blk_mq_free_shared_tags(struct blk_mq_shared_tags *shared_tags,
+ void (*exit)(void *, struct request *), void *data);
+
void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
void blk_mq_insert_request(struct request *, bool, bool, bool);
--
1.7.10.4
--
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