set_bit(ctx->index_hw, hctx->ctx_map);
}
-static struct request *blk_mq_alloc_rq(struct blk_mq_hw_ctx *hctx, gfp_t gfp,
- bool reserved)
+static struct request *__blk_mq_alloc_request(struct blk_mq_hw_ctx *hctx,
+ gfp_t gfp, bool reserved)
{
struct request *rq;
unsigned int tag;
ctx->rq_dispatched[rw_is_sync(rw_flags)]++;
}
-static struct request *__blk_mq_alloc_request(struct blk_mq_hw_ctx *hctx,
- gfp_t gfp, bool reserved)
-{
- return blk_mq_alloc_rq(hctx, gfp, reserved);
-}
-
static struct request *blk_mq_alloc_request_pinned(struct request_queue *q,
int rw, gfp_t gfp,
bool reserved)
__blk_mq_free_request(hctx, ctx, rq);
}
-static void blk_mq_bio_endio(struct request *rq, struct bio *bio, int error)
+bool blk_mq_end_io_partial(struct request *rq, int error, unsigned int nr_bytes)
{
- if (error)
- clear_bit(BIO_UPTODATE, &bio->bi_flags);
- else if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
- error = -EIO;
-
- if (unlikely(rq->cmd_flags & REQ_QUIET))
- set_bit(BIO_QUIET, &bio->bi_flags);
-
- /* don't actually finish bio if it's part of flush sequence */
- if (!(rq->cmd_flags & REQ_FLUSH_SEQ))
- bio_endio(bio, error);
-}
-
-void blk_mq_end_io(struct request *rq, int error)
-{
- struct bio *bio = rq->bio;
- unsigned int bytes = 0;
-
- trace_block_rq_complete(rq->q, rq);
-
- while (bio) {
- struct bio *next = bio->bi_next;
-
- bio->bi_next = NULL;
- bytes += bio->bi_iter.bi_size;
- blk_mq_bio_endio(rq, bio, error);
- bio = next;
- }
-
- blk_account_io_completion(rq, bytes);
+ if (blk_update_request(rq, error, blk_rq_bytes(rq)))
+ return true;
blk_account_io_done(rq);
rq->end_io(rq, error);
else
blk_mq_free_request(rq);
+ return false;
}
-EXPORT_SYMBOL(blk_mq_end_io);
+EXPORT_SYMBOL(blk_mq_end_io_partial);
static void __blk_mq_complete_request_remote(void *data)
{
rq->csd.func = __blk_mq_complete_request_remote;
rq->csd.info = rq;
rq->csd.flags = 0;
- __smp_call_function_single(ctx->cpu, &rq->csd, 0);
+ smp_call_function_single_async(ctx->cpu, &rq->csd);
} else {
rq->q->softirq_done_fn(rq);
}
LIST_HEAD(rq_list);
int bit, queued;
- if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->flags)))
+ if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->state)))
return;
hctx->run++;
void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async)
{
- if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->flags)))
+ if (unlikely(test_bit(BLK_MQ_S_STOPPED, &hctx->state)))
return;
if (!async)
queue_for_each_hw_ctx(q, hctx, i) {
if ((!blk_mq_hctx_has_pending(hctx) &&
list_empty_careful(&hctx->dispatch)) ||
- test_bit(BLK_MQ_S_STOPPED, &hctx->flags))
+ test_bit(BLK_MQ_S_STOPPED, &hctx->state))
continue;
blk_mq_run_hw_queue(hctx, async);
blk_mq_add_timer(rq);
}
-void blk_mq_insert_request(struct request_queue *q, struct request *rq,
- bool at_head, bool run_queue)
+void blk_mq_insert_request(struct request *rq, bool at_head, bool run_queue,
+ bool async)
{
+ struct request_queue *q = rq->q;
struct blk_mq_hw_ctx *hctx;
- struct blk_mq_ctx *ctx, *current_ctx;
+ struct blk_mq_ctx *ctx = rq->mq_ctx, *current_ctx;
+
+ current_ctx = blk_mq_get_ctx(q);
+ if (!cpu_online(ctx->cpu))
+ rq->mq_ctx = ctx = current_ctx;
- ctx = rq->mq_ctx;
hctx = q->mq_ops->map_queue(q, ctx->cpu);
- if (rq->cmd_flags & (REQ_FLUSH | REQ_FUA)) {
+ if (rq->cmd_flags & (REQ_FLUSH | REQ_FUA) &&
+ !(rq->cmd_flags & (REQ_FLUSH_SEQ))) {
blk_insert_flush(rq);
} else {
- current_ctx = blk_mq_get_ctx(q);
-
- if (!cpu_online(ctx->cpu)) {
- ctx = current_ctx;
- hctx = q->mq_ops->map_queue(q, ctx->cpu);
- rq->mq_ctx = ctx;
- }
spin_lock(&ctx->lock);
__blk_mq_insert_request(hctx, rq, at_head);
spin_unlock(&ctx->lock);
-
- blk_mq_put_ctx(current_ctx);
}
- if (run_queue)
- __blk_mq_run_hw_queue(hctx);
-}
-EXPORT_SYMBOL(blk_mq_insert_request);
-
-/*
- * This is a special version of blk_mq_insert_request to bypass FLUSH request
- * check. Should only be used internally.
- */
-void blk_mq_run_request(struct request *rq, bool run_queue, bool async)
-{
- struct request_queue *q = rq->q;
- struct blk_mq_hw_ctx *hctx;
- struct blk_mq_ctx *ctx, *current_ctx;
-
- current_ctx = blk_mq_get_ctx(q);
-
- ctx = rq->mq_ctx;
- if (!cpu_online(ctx->cpu)) {
- ctx = current_ctx;
- rq->mq_ctx = ctx;
- }
- hctx = q->mq_ops->map_queue(q, ctx->cpu);
-
- /* ctx->cpu might be offline */
- spin_lock(&ctx->lock);
- __blk_mq_insert_request(hctx, rq, false);
- spin_unlock(&ctx->lock);
-
blk_mq_put_ctx(current_ctx);
if (run_queue)
ctx = blk_mq_get_ctx(q);
hctx = q->mq_ops->map_queue(q, ctx->cpu);
+ if (is_sync)
+ rw |= REQ_SYNC;
trace_block_getrq(q, bio, rw);
rq = __blk_mq_alloc_request(hctx, GFP_ATOMIC, false);
if (likely(rq))
unsigned int cpu)
{
struct blk_mq_hw_ctx *hctx = data;
+ struct request_queue *q = hctx->queue;
struct blk_mq_ctx *ctx;
LIST_HEAD(tmp);
/*
* Move ctx entries to new CPU, if this one is going away.
*/
- ctx = __blk_mq_get_ctx(hctx->queue, cpu);
+ ctx = __blk_mq_get_ctx(q, cpu);
spin_lock(&ctx->lock);
if (!list_empty(&ctx->rq_list)) {
if (list_empty(&tmp))
return;
- ctx = blk_mq_get_ctx(hctx->queue);
+ ctx = blk_mq_get_ctx(q);
spin_lock(&ctx->lock);
while (!list_empty(&tmp)) {
list_move_tail(&rq->queuelist, &ctx->rq_list);
}
+ hctx = q->mq_ops->map_queue(q, ctx->cpu);
blk_mq_hctx_mark_pending(hctx, ctx);
spin_unlock(&ctx->lock);
blk_mq_put_ctx(ctx);
+
+ blk_mq_run_hw_queue(hctx, true);
+}
+
+static int blk_mq_init_hw_commands(struct blk_mq_hw_ctx *hctx,
+ int (*init)(void *, struct blk_mq_hw_ctx *,
+ struct request *, unsigned int),
+ void *data)
+{
+ unsigned int i;
+ int ret = 0;
+
+ for (i = 0; i < hctx->queue_depth; i++) {
+ struct request *rq = hctx->rqs[i];
+
+ ret = init(data, hctx, rq, i);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+int blk_mq_init_commands(struct request_queue *q,
+ int (*init)(void *, struct blk_mq_hw_ctx *,
+ struct request *, unsigned int),
+ void *data)
+{
+ struct blk_mq_hw_ctx *hctx;
+ unsigned int i;
+ int ret = 0;
+
+ queue_for_each_hw_ctx(q, hctx, i) {
+ ret = blk_mq_init_hw_commands(hctx, init, data);
+ if (ret)
+ break;
+ }
+
+ return ret;
}
+EXPORT_SYMBOL(blk_mq_init_commands);
-static void blk_mq_init_hw_commands(struct blk_mq_hw_ctx *hctx,
- void (*init)(void *, struct blk_mq_hw_ctx *,
+static void blk_mq_free_hw_commands(struct blk_mq_hw_ctx *hctx,
+ void (*free)(void *, struct blk_mq_hw_ctx *,
struct request *, unsigned int),
void *data)
{
for (i = 0; i < hctx->queue_depth; i++) {
struct request *rq = hctx->rqs[i];
- init(data, hctx, rq, i);
+ free(data, hctx, rq, i);
}
}
-void blk_mq_init_commands(struct request_queue *q,
- void (*init)(void *, struct blk_mq_hw_ctx *,
+void blk_mq_free_commands(struct request_queue *q,
+ void (*free)(void *, struct blk_mq_hw_ctx *,
struct request *, unsigned int),
void *data)
{
unsigned int i;
queue_for_each_hw_ctx(q, hctx, i)
- blk_mq_init_hw_commands(hctx, init, data);
+ blk_mq_free_hw_commands(hctx, free, data);
}
-EXPORT_SYMBOL(blk_mq_init_commands);
+EXPORT_SYMBOL(blk_mq_free_commands);
static void blk_mq_free_rq_map(struct blk_mq_hw_ctx *hctx)
{
return NOTIFY_OK;
}
+void blk_mq_disable_hotplug(void)
+{
+ mutex_lock(&all_q_mutex);
+}
+
+void blk_mq_enable_hotplug(void)
+{
+ mutex_unlock(&all_q_mutex);
+}
+
static int __init blk_mq_init(void)
{
blk_mq_cpu_init();
projects / firefly-linux-kernel-4.4.55.git / blobdiff