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path: root/drivers/block/ublk_drv.c
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Diffstat (limited to 'drivers/block/ublk_drv.c')
-rw-r--r--drivers/block/ublk_drv.c82
1 files changed, 38 insertions, 44 deletions
diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
index f96cb01e9604..e9de9d846b73 100644
--- a/drivers/block/ublk_drv.c
+++ b/drivers/block/ublk_drv.c
@@ -57,10 +57,8 @@
#define UBLK_PARAM_TYPE_ALL (UBLK_PARAM_TYPE_BASIC | UBLK_PARAM_TYPE_DISCARD)
struct ublk_rq_data {
- union {
- struct callback_head work;
- struct llist_node node;
- };
+ struct llist_node node;
+ struct callback_head work;
};
struct ublk_uring_cmd_pdu {
@@ -766,15 +764,31 @@ static inline void __ublk_rq_task_work(struct request *req)
ubq_complete_io_cmd(io, UBLK_IO_RES_OK);
}
+static inline void ublk_forward_io_cmds(struct ublk_queue *ubq)
+{
+ struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
+ struct ublk_rq_data *data, *tmp;
+
+ io_cmds = llist_reverse_order(io_cmds);
+ llist_for_each_entry_safe(data, tmp, io_cmds, node)
+ __ublk_rq_task_work(blk_mq_rq_from_pdu(data));
+}
+
+static inline void ublk_abort_io_cmds(struct ublk_queue *ubq)
+{
+ struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
+ struct ublk_rq_data *data, *tmp;
+
+ llist_for_each_entry_safe(data, tmp, io_cmds, node)
+ __ublk_abort_rq(ubq, blk_mq_rq_from_pdu(data));
+}
+
static void ublk_rq_task_work_cb(struct io_uring_cmd *cmd)
{
struct ublk_uring_cmd_pdu *pdu = ublk_get_uring_cmd_pdu(cmd);
struct ublk_queue *ubq = pdu->ubq;
- struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
- struct ublk_rq_data *data;
- llist_for_each_entry(data, io_cmds, node)
- __ublk_rq_task_work(blk_mq_rq_from_pdu(data));
+ ublk_forward_io_cmds(ubq);
}
static void ublk_rq_task_work_fn(struct callback_head *work)
@@ -782,14 +796,20 @@ static void ublk_rq_task_work_fn(struct callback_head *work)
struct ublk_rq_data *data = container_of(work,
struct ublk_rq_data, work);
struct request *req = blk_mq_rq_from_pdu(data);
+ struct ublk_queue *ubq = req->mq_hctx->driver_data;
- __ublk_rq_task_work(req);
+ ublk_forward_io_cmds(ubq);
}
-static void ublk_submit_cmd(struct ublk_queue *ubq, const struct request *rq)
+static void ublk_queue_cmd(struct ublk_queue *ubq, struct request *rq)
{
- struct ublk_io *io = &ubq->ios[rq->tag];
+ struct ublk_rq_data *data = blk_mq_rq_to_pdu(rq);
+ struct ublk_io *io;
+ if (!llist_add(&data->node, &ubq->io_cmds))
+ return;
+
+ io = &ubq->ios[rq->tag];
/*
* If the check pass, we know that this is a re-issued request aborted
* previously in monitor_work because the ubq_daemon(cmd's task) is
@@ -803,11 +823,11 @@ static void ublk_submit_cmd(struct ublk_queue *ubq, const struct request *rq)
* guarantees that here is a re-issued request aborted previously.
*/
if (unlikely(io->flags & UBLK_IO_FLAG_ABORTED)) {
- struct llist_node *io_cmds = llist_del_all(&ubq->io_cmds);
- struct ublk_rq_data *data;
-
- llist_for_each_entry(data, io_cmds, node)
- __ublk_abort_rq(ubq, blk_mq_rq_from_pdu(data));
+ ublk_abort_io_cmds(ubq);
+ } else if (ublk_can_use_task_work(ubq)) {
+ if (task_work_add(ubq->ubq_daemon, &data->work,
+ TWA_SIGNAL_NO_IPI))
+ ublk_abort_io_cmds(ubq);
} else {
struct io_uring_cmd *cmd = io->cmd;
struct ublk_uring_cmd_pdu *pdu = ublk_get_uring_cmd_pdu(cmd);
@@ -817,23 +837,6 @@ static void ublk_submit_cmd(struct ublk_queue *ubq, const struct request *rq)
}
}
-static void ublk_queue_cmd(struct ublk_queue *ubq, struct request *rq,
- bool last)
-{
- struct ublk_rq_data *data = blk_mq_rq_to_pdu(rq);
-
- if (ublk_can_use_task_work(ubq)) {
- enum task_work_notify_mode notify_mode = last ?
- TWA_SIGNAL_NO_IPI : TWA_NONE;
-
- if (task_work_add(ubq->ubq_daemon, &data->work, notify_mode))
- __ublk_abort_rq(ubq, rq);
- } else {
- if (llist_add(&data->node, &ubq->io_cmds))
- ublk_submit_cmd(ubq, rq);
- }
-}
-
static blk_status_t ublk_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
{
@@ -865,19 +868,11 @@ static blk_status_t ublk_queue_rq(struct blk_mq_hw_ctx *hctx,
return BLK_STS_OK;
}
- ublk_queue_cmd(ubq, rq, bd->last);
+ ublk_queue_cmd(ubq, rq);
return BLK_STS_OK;
}
-static void ublk_commit_rqs(struct blk_mq_hw_ctx *hctx)
-{
- struct ublk_queue *ubq = hctx->driver_data;
-
- if (ublk_can_use_task_work(ubq))
- __set_notify_signal(ubq->ubq_daemon);
-}
-
static int ublk_init_hctx(struct blk_mq_hw_ctx *hctx, void *driver_data,
unsigned int hctx_idx)
{
@@ -899,7 +894,6 @@ static int ublk_init_rq(struct blk_mq_tag_set *set, struct request *req,
static const struct blk_mq_ops ublk_mq_ops = {
.queue_rq = ublk_queue_rq,
- .commit_rqs = ublk_commit_rqs,
.init_hctx = ublk_init_hctx,
.init_request = ublk_init_rq,
};
@@ -1197,7 +1191,7 @@ static void ublk_handle_need_get_data(struct ublk_device *ub, int q_id,
struct ublk_queue *ubq = ublk_get_queue(ub, q_id);
struct request *req = blk_mq_tag_to_rq(ub->tag_set.tags[q_id], tag);
- ublk_queue_cmd(ubq, req, true);
+ ublk_queue_cmd(ubq, req);
}
static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)