#include <linux/prefetch.h>
#include <linux/blk-crypto.h>
#include <linux/part_stat.h>
+#include <linux/sched/isolation.h>
#include <trace/events/block.h>
{
struct request_queue *q = rq->q;
+ blk_zone_finish_request(rq);
+
if (rq->rq_flags & RQF_USE_SCHED) {
q->elevator->type->ops.finish_request(rq);
/*
}
EXPORT_SYMBOL(blk_dump_rq_flags);
-static void req_bio_endio(struct request *rq, struct bio *bio,
- unsigned int nbytes, blk_status_t error)
-{
- if (unlikely(error)) {
- bio->bi_status = error;
- } else if (req_op(rq) == REQ_OP_ZONE_APPEND) {
- /*
- * Partial zone append completions cannot be supported as the
- * BIO fragments may end up not being written sequentially.
- */
- if (bio->bi_iter.bi_size != nbytes)
- bio->bi_status = BLK_STS_IOERR;
- else
- bio->bi_iter.bi_sector = rq->__sector;
- }
-
- bio_advance(bio, nbytes);
-
- if (unlikely(rq->rq_flags & RQF_QUIET))
- bio_set_flag(bio, BIO_QUIET);
- /* don't actually finish bio if it's part of flush sequence */
- if (bio->bi_iter.bi_size == 0 && !(rq->rq_flags & RQF_FLUSH_SEQ))
- bio_endio(bio);
-}
-
static void blk_account_io_completion(struct request *req, unsigned int bytes)
{
if (req->part && blk_do_io_stat(req)) {
/* Completion has already been traced */
bio_clear_flag(bio, BIO_TRACE_COMPLETION);
- if (req_op(req) == REQ_OP_ZONE_APPEND)
- bio->bi_iter.bi_sector = req->__sector;
+ blk_zone_update_request_bio(req, bio);
if (!is_flush)
bio_endio(bio);
bool blk_update_request(struct request *req, blk_status_t error,
unsigned int nr_bytes)
{
+ bool is_flush = req->rq_flags & RQF_FLUSH_SEQ;
+ bool quiet = req->rq_flags & RQF_QUIET;
int total_bytes;
trace_block_rq_complete(req, error, nr_bytes);
if (blk_crypto_rq_has_keyslot(req) && nr_bytes >= blk_rq_bytes(req))
__blk_crypto_rq_put_keyslot(req);
- if (unlikely(error && !blk_rq_is_passthrough(req) &&
- !(req->rq_flags & RQF_QUIET)) &&
- !test_bit(GD_DEAD, &req->q->disk->state)) {
+ if (unlikely(error && !blk_rq_is_passthrough(req) && !quiet) &&
+ !test_bit(GD_DEAD, &req->q->disk->state)) {
blk_print_req_error(req, error);
trace_block_rq_error(req, error, nr_bytes);
}
struct bio *bio = req->bio;
unsigned bio_bytes = min(bio->bi_iter.bi_size, nr_bytes);
- if (bio_bytes == bio->bi_iter.bi_size)
+ if (unlikely(error))
+ bio->bi_status = error;
+
+ if (bio_bytes == bio->bi_iter.bi_size) {
req->bio = bio->bi_next;
+ } else if (bio_is_zone_append(bio) && error == BLK_STS_OK) {
+ /*
+ * Partial zone append completions cannot be supported
+ * as the BIO fragments may end up not being written
+ * sequentially.
+ */
+ bio->bi_status = BLK_STS_IOERR;
+ }
/* Completion has already been traced */
bio_clear_flag(bio, BIO_TRACE_COMPLETION);
- req_bio_endio(req, bio, bio_bytes, error);
+ if (unlikely(quiet))
+ bio_set_flag(bio, BIO_QUIET);
+
+ bio_advance(bio, bio_bytes);
+
+ /* Don't actually finish bio if it's part of flush sequence */
+ if (!bio->bi_iter.bi_size) {
+ blk_zone_update_request_bio(req, bio);
+ if (!is_flush)
+ bio_endio(bio);
+ }
total_bytes += bio_bytes;
nr_bytes -= bio_bytes;
update_io_ticks(req->part, jiffies, true);
part_stat_inc(req->part, ios[sgrp]);
part_stat_add(req->part, nsecs[sgrp], now - req->start_time_ns);
+ part_stat_local_dec(req->part,
+ in_flight[op_is_write(req_op(req))]);
part_stat_unlock();
}
}
part_stat_lock();
update_io_ticks(req->part, jiffies, false);
+ part_stat_local_inc(req->part,
+ in_flight[op_is_write(req_op(req))]);
part_stat_unlock();
}
}
blk_account_io_start(rq);
- /*
- * As plugging can be enabled for passthrough requests on a zoned
- * device, directly accessing the plug instead of using blk_mq_plug()
- * should not have any consequences.
- */
if (current->plug && !at_head) {
blk_add_rq_to_plug(current->plug, rq);
return;
__blk_mq_requeue_request(rq);
}
-static void blk_mq_handle_zone_resource(struct request *rq,
- struct list_head *zone_list)
-{
- /*
- * If we end up here it is because we cannot dispatch a request to a
- * specific zone due to LLD level zone-write locking or other zone
- * related resource not being available. In this case, set the request
- * aside in zone_list for retrying it later.
- */
- list_add(&rq->queuelist, zone_list);
- __blk_mq_requeue_request(rq);
-}
-
enum prep_dispatch {
PREP_DISPATCH_OK,
PREP_DISPATCH_NO_TAG,
struct request *rq;
int queued;
blk_status_t ret = BLK_STS_OK;
- LIST_HEAD(zone_list);
bool needs_resource = false;
if (list_empty(list))
case BLK_STS_DEV_RESOURCE:
blk_mq_handle_dev_resource(rq, list);
goto out;
- case BLK_STS_ZONE_RESOURCE:
- /*
- * Move the request to zone_list and keep going through
- * the dispatch list to find more requests the drive can
- * accept.
- */
- blk_mq_handle_zone_resource(rq, &zone_list);
- needs_resource = true;
- break;
default:
blk_mq_end_request(rq, ret);
}
} while (!list_empty(list));
out:
- if (!list_empty(&zone_list))
- list_splice_tail_init(&zone_list, list);
-
/* If we didn't flush the entire list, we could have told the driver
* there was more coming, but that turned out to be a lie.
*/
return cpu;
}
+/*
+ * ->next_cpu is always calculated from hctx->cpumask, so simply use
+ * it for speeding up the check
+ */
+static bool blk_mq_hctx_empty_cpumask(struct blk_mq_hw_ctx *hctx)
+{
+ return hctx->next_cpu >= nr_cpu_ids;
+}
+
/*
* It'd be great if the workqueue API had a way to pass
* in a mask and had some smarts for more clever placement.
bool tried = false;
int next_cpu = hctx->next_cpu;
- if (hctx->queue->nr_hw_queues == 1)
+ /* Switch to unbound if no allowable CPUs in this hctx */
+ if (hctx->queue->nr_hw_queues == 1 || blk_mq_hctx_empty_cpumask(hctx))
return WORK_CPU_UNBOUND;
if (--hctx->next_cpu_batch <= 0) {
void blk_mq_submit_bio(struct bio *bio)
{
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
- struct blk_plug *plug = blk_mq_plug(bio);
+ struct blk_plug *plug = current->plug;
const int is_sync = op_is_sync(bio->bi_opf);
struct blk_mq_hw_ctx *hctx;
unsigned int nr_segs = 1;
struct request *rq;
blk_status_t ret;
+ /*
+ * If the plug has a cached request for this queue, try to use it.
+ */
+ rq = blk_mq_peek_cached_request(plug, q, bio->bi_opf);
+
+ /*
+ * A BIO that was released from a zone write plug has already been
+ * through the preparation in this function, already holds a reference
+ * on the queue usage counter, and is the only write BIO in-flight for
+ * the target zone. Go straight to preparing a request for it.
+ */
+ if (bio_zone_write_plugging(bio)) {
+ nr_segs = bio->__bi_nr_segments;
+ if (rq)
+ blk_queue_exit(q);
+ goto new_request;
+ }
+
bio = blk_queue_bounce(bio, q);
/*
- * If the plug has a cached request for this queue, try use it.
- *
* The cached request already holds a q_usage_counter reference and we
* don't have to acquire a new one if we use it.
*/
- rq = blk_mq_peek_cached_request(plug, q, bio->bi_opf);
if (!rq) {
if (unlikely(bio_queue_enter(bio)))
return;
if (blk_mq_attempt_bio_merge(q, bio, nr_segs))
goto queue_exit;
+ if (blk_queue_is_zoned(q) && blk_zone_plug_bio(bio, nr_segs))
+ goto queue_exit;
+
+new_request:
if (!rq) {
rq = blk_mq_get_new_requests(q, plug, bio, nr_segs);
if (unlikely(!rq))
return;
}
+ if (bio_zone_write_plugging(bio))
+ blk_zone_write_plug_init_request(rq);
+
if (op_is_flush(bio->bi_opf) && blk_insert_flush(rq))
return;
return data.has_rq;
}
-static inline bool blk_mq_last_cpu_in_hctx(unsigned int cpu,
- struct blk_mq_hw_ctx *hctx)
+static bool blk_mq_hctx_has_online_cpu(struct blk_mq_hw_ctx *hctx,
+ unsigned int this_cpu)
{
- if (cpumask_first_and(hctx->cpumask, cpu_online_mask) != cpu)
- return false;
- if (cpumask_next_and(cpu, hctx->cpumask, cpu_online_mask) < nr_cpu_ids)
- return false;
- return true;
+ enum hctx_type type = hctx->type;
+ int cpu;
+
+ /*
+ * hctx->cpumask has to rule out isolated CPUs, but userspace still
+ * might submit IOs on these isolated CPUs, so use the queue map to
+ * check if all CPUs mapped to this hctx are offline
+ */
+ for_each_online_cpu(cpu) {
+ struct blk_mq_hw_ctx *h = blk_mq_map_queue_type(hctx->queue,
+ type, cpu);
+
+ if (h != hctx)
+ continue;
+
+ /* this hctx has at least one online CPU */
+ if (this_cpu != cpu)
+ return true;
+ }
+
+ return false;
}
static int blk_mq_hctx_notify_offline(unsigned int cpu, struct hlist_node *node)
struct blk_mq_hw_ctx *hctx = hlist_entry_safe(node,
struct blk_mq_hw_ctx, cpuhp_online);
- if (!cpumask_test_cpu(cpu, hctx->cpumask) ||
- !blk_mq_last_cpu_in_hctx(cpu, hctx))
+ if (blk_mq_hctx_has_online_cpu(hctx, cpu))
return 0;
/*
}
queue_for_each_hw_ctx(q, hctx, i) {
+ int cpu;
+
/*
* If no software queues are mapped to this hardware queue,
* disable it and free the request entries.
*/
sbitmap_resize(&hctx->ctx_map, hctx->nr_ctx);
+ /*
+ * Rule out isolated CPUs from hctx->cpumask to avoid
+ * running block kworker on isolated CPUs
+ */
+ for_each_cpu(cpu, hctx->cpumask) {
+ if (cpu_is_isolated(cpu))
+ cpumask_clear_cpu(cpu, hctx->cpumask);
+ }
+
/*
* Initialize batch roundrobin counts
*/
projects / thirdparty / kernel / linux.git / blobdiff