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)
return rq;
}
-struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
- gfp_t gfp, bool reserved)
+struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp)
{
struct request *rq;
if (blk_mq_queue_enter(q))
return NULL;
- rq = blk_mq_alloc_request_pinned(q, rw, gfp, reserved);
+ rq = blk_mq_alloc_request_pinned(q, rw, gfp, false);
if (rq)
blk_mq_put_ctx(rq->mq_ctx);
return rq;
/*
* Re-init and set pdu, if we have it
*/
-static void blk_mq_rq_init(struct blk_mq_hw_ctx *hctx, struct request *rq)
+void blk_mq_rq_init(struct blk_mq_hw_ctx *hctx, struct request *rq)
{
blk_rq_init(hctx->queue, rq);
__blk_mq_free_request(hctx, ctx, rq);
}
-static void blk_mq_bio_endio(struct request *rq, struct bio *bio, int error)
-{
- 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_complete_request(struct request *rq, int error)
+bool blk_mq_end_io_partial(struct request *rq, int error, unsigned int nr_bytes)
{
- 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_partial);
-void __blk_mq_end_io(struct request *rq, int error)
-{
- if (!blk_mark_rq_complete(rq))
- blk_mq_complete_request(rq, error);
-}
-
-static void blk_mq_end_io_remote(void *data)
+static void __blk_mq_complete_request_remote(void *data)
{
struct request *rq = data;
- __blk_mq_end_io(rq, rq->errors);
+ rq->q->softirq_done_fn(rq);
}
-/*
- * End IO on this request on a multiqueue enabled driver. We'll either do
- * it directly inline, or punt to a local IPI handler on the matching
- * remote CPU.
- */
-void blk_mq_end_io(struct request *rq, int error)
+void __blk_mq_complete_request(struct request *rq)
{
struct blk_mq_ctx *ctx = rq->mq_ctx;
int cpu;
- if (!ctx->ipi_redirect)
- return __blk_mq_end_io(rq, error);
+ if (!ctx->ipi_redirect) {
+ rq->q->softirq_done_fn(rq);
+ return;
+ }
cpu = get_cpu();
if (cpu != ctx->cpu && cpu_online(ctx->cpu)) {
- rq->errors = error;
- rq->csd.func = blk_mq_end_io_remote;
+ 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);
} else {
- __blk_mq_end_io(rq, error);
+ rq->q->softirq_done_fn(rq);
}
put_cpu();
}
-EXPORT_SYMBOL(blk_mq_end_io);
-static void blk_mq_start_request(struct request *rq)
+/**
+ * blk_mq_complete_request - end I/O on a request
+ * @rq: the request being processed
+ *
+ * Description:
+ * Ends all I/O on a request. It does not handle partial completions.
+ * The actual completion happens out-of-order, through a IPI handler.
+ **/
+void blk_mq_complete_request(struct request *rq)
+{
+ if (unlikely(blk_should_fake_timeout(rq->q)))
+ return;
+ if (!blk_mark_rq_complete(rq))
+ __blk_mq_complete_request(rq);
+}
+EXPORT_SYMBOL(blk_mq_complete_request);
+
+static void blk_mq_start_request(struct request *rq, bool last)
{
struct request_queue *q = rq->q;
*/
rq->deadline = jiffies + q->rq_timeout;
set_bit(REQ_ATOM_STARTED, &rq->atomic_flags);
+
+ if (q->dma_drain_size && blk_rq_bytes(rq)) {
+ /*
+ * Make sure space for the drain appears. We know we can do
+ * this because max_hw_segments has been adjusted to be one
+ * fewer than the device can handle.
+ */
+ rq->nr_phys_segments++;
+ }
+
+ /*
+ * Flag the last request in the series so that drivers know when IO
+ * should be kicked off, if they don't do it on a per-request basis.
+ *
+ * Note: the flag isn't the only condition drivers should do kick off.
+ * If drive is busy, the last request might not have the bit set.
+ */
+ if (last)
+ rq->cmd_flags |= REQ_END;
}
static void blk_mq_requeue_request(struct request *rq)
trace_block_rq_requeue(q, rq);
clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags);
+
+ rq->cmd_flags &= ~REQ_END;
+
+ if (q->dma_drain_size && blk_rq_bytes(rq))
+ rq->nr_phys_segments--;
}
struct blk_mq_timeout_data {
rq = list_first_entry(&rq_list, struct request, queuelist);
list_del_init(&rq->queuelist);
- blk_mq_start_request(rq);
- /*
- * Last request in the series. Flag it as such, this
- * enables drivers to know when IO should be kicked off,
- * if they don't do it on a per-request basis.
- *
- * Note: the flag isn't the only condition drivers
- * should do kick off. If drive is busy, the last
- * request might not have the bit set.
- */
- if (list_empty(&rq_list))
- rq->cmd_flags |= REQ_END;
+ blk_mq_start_request(rq, list_empty(&rq_list));
ret = q->mq_ops->queue_rq(hctx, rq);
switch (ret) {
break;
default:
pr_err("blk-mq: bad return on queue: %d\n", ret);
- rq->errors = -EIO;
case BLK_MQ_RQ_QUEUE_ERROR:
+ rq->errors = -EIO;
blk_mq_end_io(rq, rq->errors);
break;
}
}
static void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx,
- struct request *rq)
+ struct request *rq, bool at_head)
{
struct blk_mq_ctx *ctx = rq->mq_ctx;
trace_block_rq_insert(hctx->queue, rq);
- list_add_tail(&rq->queuelist, &ctx->rq_list);
+ if (at_head)
+ list_add(&rq->queuelist, &ctx->rq_list);
+ else
+ list_add_tail(&rq->queuelist, &ctx->rq_list);
blk_mq_hctx_mark_pending(hctx, ctx);
/*
blk_mq_add_timer(rq);
}
-void blk_mq_insert_request(struct request_queue *q, struct request *rq,
- 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);
+ __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);
- spin_unlock(&ctx->lock);
-
blk_mq_put_ctx(current_ctx);
if (run_queue)
rq = list_first_entry(list, struct request, queuelist);
list_del_init(&rq->queuelist);
rq->mq_ctx = ctx;
- __blk_mq_insert_request(hctx, rq);
+ __blk_mq_insert_request(hctx, rq, false);
}
spin_unlock(&ctx->lock);
blk_queue_bounce(q, &bio);
+ if (bio_integrity_enabled(bio) && bio_integrity_prep(bio)) {
+ bio_endio(bio, -EIO);
+ return;
+ }
+
if (use_plug && blk_attempt_plug_merge(q, bio, &request_count))
return;
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))
__blk_mq_free_request(hctx, ctx, rq);
else {
blk_mq_bio_to_request(rq, bio);
- __blk_mq_insert_request(hctx, rq);
+ __blk_mq_insert_request(hctx, rq, false);
}
spin_unlock(&ctx->lock);
reg->queue_depth = BLK_MQ_MAX_DEPTH;
}
- /*
- * Set aside a tag for flush requests. It will only be used while
- * another flush request is in progress but outside the driver.
- *
- * TODO: only allocate if flushes are supported
- */
- reg->queue_depth++;
- reg->reserved_tags++;
-
if (reg->queue_depth < (reg->reserved_tags + BLK_MQ_TAG_MIN))
return ERR_PTR(-EINVAL);
q->mq_ops = reg->ops;
q->queue_flags |= QUEUE_FLAG_MQ_DEFAULT;
+ q->sg_reserved_size = INT_MAX;
+
blk_queue_make_request(q, blk_mq_make_request);
blk_queue_rq_timed_out(q, reg->ops->timeout);
if (reg->timeout)
blk_queue_rq_timeout(q, reg->timeout);
+ if (reg->ops->complete)
+ blk_queue_softirq_done(q, reg->ops->complete);
+
blk_mq_init_flush(q);
blk_mq_init_cpu_queues(q, reg->nr_hw_queues);
- if (blk_mq_init_hw_queues(q, reg, driver_data))
+ q->flush_rq = kzalloc(round_up(sizeof(struct request) + reg->cmd_size,
+ cache_line_size()), GFP_KERNEL);
+ if (!q->flush_rq)
goto err_hw;
+ if (blk_mq_init_hw_queues(q, reg, driver_data))
+ goto err_flush_rq;
+
blk_mq_map_swqueue(q);
mutex_lock(&all_q_mutex);
mutex_unlock(&all_q_mutex);
return q;
+
+err_flush_rq:
+ kfree(q->flush_rq);
err_hw:
kfree(q->mq_map);
err_map:
projects / ~andy / linux / blobdiff