leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

nvmet: update AEN list and array at one place

Browse Source 
All async events are enqueued via nvmet_add_async_event() which
updates the ctrl->async_event_cmds[] array and additionally an struct
nvmet_async_event is added to the ctrl->async_events list.

Under normal operations the nvmet_async_event_work() updates again
the ctrl->async_event_cmds and removes the corresponding struct
nvmet_async_event from the list again. Though nvmet_sq_destroy() could
be called which calls nvmet_async_events_free() which only updates the
ctrl->async_event_cmds[] array.

Add new functions nvmet_async_events_process() and
nvmet_async_events_free() to process async events, update an array and
the list.

When we destroy submission queue after clearing the aen present on
the ctrl->async list we also loop over ctrl->async_event_cmds[] for
any requests posted by the host for which we don't have the AEN in
the ctrl->async_events list by calling nvmet_async_event_process()
and nvmet_async_events_free().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Daniel Wagner <dwagner@suse.de>
[chaitanya.kulkarni@wdc.com
 * Loop over and clear out outstanding requests
 * Update changelog
]
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Daniel Wagner 2020-01-30 10:29:34 -08:00 committed by Keith Busch
parent 1a3f540d63
commit 0f5be6a4ff
1 changed files with 36 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
drivers/nvme/target/core.c
View File

@ -129,27 +129,8 @@ static u32 nvmet_async_event_result(struct nvmet_async_event *aen)
return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16);
}
static void nvmet_async_events_free(struct nvmet_ctrl *ctrl)
static void nvmet_async_events_process(struct nvmet_ctrl *ctrl, u16 status)
{
struct nvmet_req *req;
while (1) {
mutex_lock(&ctrl->lock);
if (!ctrl->nr_async_event_cmds) {
mutex_unlock(&ctrl->lock);
return;
}
req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
mutex_unlock(&ctrl->lock);
nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR);
}
}
static void nvmet_async_event_work(struct work_struct *work)
{
struct nvmet_ctrl *ctrl =
container_of(work, struct nvmet_ctrl, async_event_work);
struct nvmet_async_event *aen;
struct nvmet_req *req;
@ -159,20 +140,43 @@ static void nvmet_async_event_work(struct work_struct *work)
struct nvmet_async_event, entry);
if (!aen || !ctrl->nr_async_event_cmds) {
mutex_unlock(&ctrl->lock);
return;
break;
}
req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
nvmet_set_result(req, nvmet_async_event_result(aen));
if (status == 0)
nvmet_set_result(req, nvmet_async_event_result(aen));
list_del(&aen->entry);
kfree(aen);
mutex_unlock(&ctrl->lock);
nvmet_req_complete(req, 0);
nvmet_req_complete(req, status);
}
}
static void nvmet_async_events_free(struct nvmet_ctrl *ctrl)
{
struct nvmet_req *req;
mutex_lock(&ctrl->lock);
while (ctrl->nr_async_event_cmds) {
req = ctrl->async_event_cmds[--ctrl->nr_async_event_cmds];
mutex_unlock(&ctrl->lock);
nvmet_req_complete(req, NVME_SC_INTERNAL | NVME_SC_DNR);
mutex_lock(&ctrl->lock);
}
mutex_unlock(&ctrl->lock);
}
static void nvmet_async_event_work(struct work_struct *work)
{
struct nvmet_ctrl *ctrl =
container_of(work, struct nvmet_ctrl, async_event_work);
nvmet_async_events_process(ctrl, 0);
}
void nvmet_add_async_event(struct nvmet_ctrl *ctrl, u8 event_type,
u8 event_info, u8 log_page)
{
@ -753,19 +757,24 @@ static void nvmet_confirm_sq(struct percpu_ref *ref)
void nvmet_sq_destroy(struct nvmet_sq *sq)
{
u16 status = NVME_SC_INTERNAL | NVME_SC_DNR;
struct nvmet_ctrl *ctrl = sq->ctrl;
/*
* If this is the admin queue, complete all AERs so that our
* queue doesn't have outstanding requests on it.
*/
if (sq->ctrl && sq->ctrl->sqs && sq->ctrl->sqs[0] == sq)
nvmet_async_events_free(sq->ctrl);
if (ctrl && ctrl->sqs && ctrl->sqs[0] == sq) {
nvmet_async_events_process(ctrl, status);
nvmet_async_events_free(ctrl);
}
percpu_ref_kill_and_confirm(&sq->ref, nvmet_confirm_sq);
wait_for_completion(&sq->confirm_done);
wait_for_completion(&sq->free_done);
percpu_ref_exit(&sq->ref);
if (sq->ctrl) {
nvmet_ctrl_put(sq->ctrl);
if (ctrl) {
nvmet_ctrl_put(ctrl);
sq->ctrl = NULL; /* allows reusing the queue later */
}
}