mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
skd: Convert to blk-mq
Introduce a tag set and a blk_mq_ops structure. Set .cmd_size such that struct request and struct skd_request_context are allocated through a single allocation. Remove the skd_request_context.req pointer. Make queue starting asynchronous such that this can occur safely from interrupt context. Use locking to protect skdev->skmsg and *skdev->skmsg against concurrent access from concurrent .queue_rq() calls. Introduce the functions skd_init_request() and skd_exit_request() to set up / clean up the per-request S/G-list. Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.de> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
e7278a8b31
commit
ca33dd9296
1 changed files with 92 additions and 139 deletions
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@ -230,6 +230,7 @@ struct skd_device {
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spinlock_t lock;
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struct gendisk *disk;
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struct blk_mq_tag_set tag_set;
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struct request_queue *queue;
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struct skd_fitmsg_context *skmsg;
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struct device *class_dev;
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@ -287,6 +288,7 @@ struct skd_device {
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u32 timo_slot;
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struct work_struct start_queue;
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struct work_struct completion_worker;
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};
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@ -371,7 +373,6 @@ static void skd_send_fitmsg(struct skd_device *skdev,
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struct skd_fitmsg_context *skmsg);
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static void skd_send_special_fitmsg(struct skd_device *skdev,
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struct skd_special_context *skspcl);
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static void skd_request_fn(struct request_queue *rq);
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static void skd_end_request(struct skd_device *skdev, struct request *req,
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blk_status_t status);
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static bool skd_preop_sg_list(struct skd_device *skdev,
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@ -398,20 +399,6 @@ static void skd_log_skreq(struct skd_device *skdev,
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* READ/WRITE REQUESTS
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*****************************************************************************
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*/
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static void skd_fail_all_pending(struct skd_device *skdev)
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{
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struct request_queue *q = skdev->queue;
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struct request *req;
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for (;; ) {
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req = blk_peek_request(q);
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if (req == NULL)
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break;
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WARN_ON_ONCE(blk_queue_start_tag(q, req));
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__blk_end_request_all(req, BLK_STS_IOERR);
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}
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}
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static void
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skd_prep_rw_cdb(struct skd_scsi_request *scsi_req,
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int data_dir, unsigned lba,
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@ -490,7 +477,7 @@ static bool skd_fail_all(struct request_queue *q)
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}
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}
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static void skd_process_request(struct request *req)
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static void skd_process_request(struct request *req, bool last)
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{
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struct request_queue *const q = req->q;
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struct skd_device *skdev = q->queuedata;
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@ -499,6 +486,7 @@ static void skd_process_request(struct request *req)
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const u32 tag = blk_mq_unique_tag(req);
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struct skd_request_context *const skreq = blk_mq_rq_to_pdu(req);
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struct skd_scsi_request *scsi_req;
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unsigned long flags;
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unsigned long io_flags;
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u32 lba;
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u32 count;
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@ -545,6 +533,7 @@ static void skd_process_request(struct request *req)
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return;
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}
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spin_lock_irqsave(&skdev->lock, flags);
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/* Either a FIT msg is in progress or we have to start one. */
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skmsg = skdev->skmsg;
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if (!skmsg) {
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@ -602,83 +591,30 @@ static void skd_process_request(struct request *req)
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/*
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* If the FIT msg buffer is full send it.
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*/
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if (fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
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if (last || fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
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skd_send_fitmsg(skdev, skmsg);
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skdev->skmsg = NULL;
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}
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spin_unlock_irqrestore(&skdev->lock, flags);
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}
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static void skd_request_fn(struct request_queue *q)
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static blk_status_t skd_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
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const struct blk_mq_queue_data *mqd)
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{
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struct request *req = mqd->rq;
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struct request_queue *q = req->q;
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struct skd_device *skdev = q->queuedata;
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struct request *req;
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if (skdev->state != SKD_DRVR_STATE_ONLINE) {
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if (skd_fail_all(q))
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skd_fail_all_pending(skdev);
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return;
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if (skdev->state == SKD_DRVR_STATE_ONLINE) {
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blk_mq_start_request(req);
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skd_process_request(req, mqd->last);
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return BLK_STS_OK;
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} else {
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return skd_fail_all(q) ? BLK_STS_IOERR : BLK_STS_RESOURCE;
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}
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if (blk_queue_stopped(skdev->queue)) {
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if (atomic_read(&skdev->in_flight) >=
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skdev->queue_low_water_mark)
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/* There is still some kind of shortage */
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return;
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queue_flag_clear(QUEUE_FLAG_STOPPED, skdev->queue);
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}
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/*
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* Stop conditions:
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* - There are no more native requests
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* - There are already the maximum number of requests in progress
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* - There are no more skd_request_context entries
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* - There are no more FIT msg buffers
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*/
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for (;; ) {
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req = blk_peek_request(q);
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/* Are there any native requests to start? */
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if (req == NULL)
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break;
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/* At this point we know there is a request */
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/* Are too many requets already in progress? */
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if (atomic_read(&skdev->in_flight) >=
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skdev->cur_max_queue_depth) {
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dev_dbg(&skdev->pdev->dev, "qdepth %d, limit %d\n",
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atomic_read(&skdev->in_flight),
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skdev->cur_max_queue_depth);
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break;
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}
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/*
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* OK to now dequeue request from q.
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*
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* At this point we are comitted to either start or reject
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* the native request. Note that skd_request_context is
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* available but is still at the head of the free list.
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*/
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WARN_ON_ONCE(blk_queue_start_tag(q, req));
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skd_process_request(req);
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}
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/* If the FIT msg buffer is not empty send what we got. */
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if (skdev->skmsg) {
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struct fit_msg_hdr *fmh = &skdev->skmsg->msg_buf->fmh;
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WARN_ON_ONCE(!fmh->num_protocol_cmds_coalesced);
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skd_send_fitmsg(skdev, skdev->skmsg);
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skdev->skmsg = NULL;
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}
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/*
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* If req is non-NULL it means there is something to do but
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* we are out of a resource.
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*/
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if (req)
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blk_stop_queue(skdev->queue);
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return BLK_STS_OK;
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}
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static void skd_end_request(struct skd_device *skdev, struct request *req,
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@ -696,7 +632,7 @@ static void skd_end_request(struct skd_device *skdev, struct request *req,
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dev_dbg(&skdev->pdev->dev, "id=0x%x error=%d\n", req->tag,
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error);
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__blk_end_request_all(req, error);
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blk_mq_end_request(req, error);
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}
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static bool skd_preop_sg_list(struct skd_device *skdev,
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@ -781,6 +717,19 @@ static void skd_postop_sg_list(struct skd_device *skdev,
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static void skd_timer_tick_not_online(struct skd_device *skdev);
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static void skd_start_queue(struct work_struct *work)
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{
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struct skd_device *skdev = container_of(work, typeof(*skdev),
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start_queue);
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/*
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* Although it is safe to call blk_start_queue() from interrupt
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* context, blk_mq_start_hw_queues() must not be called from
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* interrupt context.
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*/
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blk_mq_start_hw_queues(skdev->queue);
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}
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static void skd_timer_tick(ulong arg)
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{
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struct skd_device *skdev = (struct skd_device *)arg;
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@ -886,7 +835,7 @@ static void skd_timer_tick_not_online(struct skd_device *skdev)
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/*start the queue so we can respond with error to requests */
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/* wakeup anyone waiting for startup complete */
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blk_start_queue(skdev->queue);
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schedule_work(&skdev->start_queue);
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skdev->gendisk_on = -1;
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wake_up_interruptible(&skdev->waitq);
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break;
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@ -961,7 +910,7 @@ static void skd_timer_tick_not_online(struct skd_device *skdev)
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/*start the queue so we can respond with error to requests */
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/* wakeup anyone waiting for startup complete */
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blk_start_queue(skdev->queue);
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schedule_work(&skdev->start_queue);
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skdev->gendisk_on = -1;
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wake_up_interruptible(&skdev->waitq);
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break;
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@ -1543,7 +1492,6 @@ static void skd_resolve_req_exception(struct skd_device *skdev,
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}
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}
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/* assume spinlock is already held */
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static void skd_release_skreq(struct skd_device *skdev,
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struct skd_request_context *skreq)
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{
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@ -1574,6 +1522,7 @@ static int skd_isr_completion_posted(struct skd_device *skdev,
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struct fit_comp_error_info *skerr;
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u16 req_id;
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u32 tag;
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u16 hwq = 0;
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struct request *rq;
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struct skd_request_context *skreq;
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u16 cmp_cntxt;
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/*
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* This is not a completion for a r/w request.
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*/
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WARN_ON_ONCE(blk_map_queue_find_tag(skdev->queue->
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queue_tags, tag));
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WARN_ON_ONCE(blk_mq_tag_to_rq(skdev->tag_set.tags[hwq],
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tag));
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skd_complete_other(skdev, skcmp, skerr);
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continue;
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}
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rq = blk_map_queue_find_tag(skdev->queue->queue_tags, tag);
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rq = blk_mq_tag_to_rq(skdev->tag_set.tags[hwq], tag);
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if (WARN(!rq, "No request for tag %#x -> %#x\n", cmp_cntxt,
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tag))
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continue;
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@ -1789,7 +1738,7 @@ static void skd_completion_worker(struct work_struct *work)
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* process everything in compq
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*/
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skd_isr_completion_posted(skdev, 0, &flush_enqueued);
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blk_run_queue_async(skdev->queue);
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schedule_work(&skdev->start_queue);
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spin_unlock_irqrestore(&skdev->lock, flags);
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}
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@ -1865,12 +1814,12 @@ skd_isr(int irq, void *ptr)
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}
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if (unlikely(flush_enqueued))
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blk_run_queue_async(skdev->queue);
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schedule_work(&skdev->start_queue);
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if (deferred)
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schedule_work(&skdev->completion_worker);
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else if (!flush_enqueued)
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blk_run_queue_async(skdev->queue);
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schedule_work(&skdev->start_queue);
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spin_unlock(&skdev->lock);
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@ -1953,7 +1902,7 @@ static void skd_isr_fwstate(struct skd_device *skdev)
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*/
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skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
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skdev->timer_countdown = SKD_TIMER_SECONDS(3);
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blk_start_queue(skdev->queue);
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schedule_work(&skdev->start_queue);
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break;
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case FIT_SR_DRIVE_BUSY_ERASE:
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skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
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@ -1987,7 +1936,7 @@ static void skd_isr_fwstate(struct skd_device *skdev)
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case FIT_SR_DRIVE_FAULT:
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skd_drive_fault(skdev);
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skd_recover_requests(skdev);
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blk_start_queue(skdev->queue);
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schedule_work(&skdev->start_queue);
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break;
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/* PCIe bus returned all Fs? */
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@ -1996,7 +1945,7 @@ static void skd_isr_fwstate(struct skd_device *skdev)
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sense);
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skd_drive_disappeared(skdev);
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skd_recover_requests(skdev);
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blk_start_queue(skdev->queue);
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schedule_work(&skdev->start_queue);
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break;
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default:
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/*
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@ -2009,18 +1958,16 @@ static void skd_isr_fwstate(struct skd_device *skdev)
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skd_skdev_state_to_str(skdev->state), skdev->state);
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}
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static void skd_recover_request(struct skd_device *skdev,
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struct skd_request_context *skreq)
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static void skd_recover_request(struct request *req, void *data, bool reserved)
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{
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struct request *req = blk_mq_rq_from_pdu(skreq);
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struct skd_device *const skdev = data;
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struct skd_request_context *skreq = blk_mq_rq_to_pdu(req);
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if (skreq->state != SKD_REQ_STATE_BUSY)
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return;
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skd_log_skreq(skdev, skreq, "recover");
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SKD_ASSERT(req != NULL);
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/* Release DMA resources for the request. */
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if (skreq->n_sg > 0)
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skd_postop_sg_list(skdev, skreq);
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@ -2034,15 +1981,7 @@ static void skd_recover_requests(struct skd_device *skdev)
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{
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int i;
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for (i = 0; i < skdev->num_req_context; i++) {
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struct request *rq = blk_map_queue_find_tag(skdev->queue->
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queue_tags, i);
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struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
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if (!rq)
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continue;
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skd_recover_request(skdev, skreq);
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}
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blk_mq_tagset_busy_iter(&skdev->tag_set, skd_recover_request, skdev);
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for (i = 0; i < SKD_N_TIMEOUT_SLOT; i++)
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atomic_set(&skdev->timeout_slot[i], 0);
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@ -2263,7 +2202,7 @@ static void skd_start_device(struct skd_device *skdev)
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skd_drive_fault(skdev);
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/*start the queue so we can respond with error to requests */
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dev_dbg(&skdev->pdev->dev, "starting queue\n");
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blk_start_queue(skdev->queue);
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schedule_work(&skdev->start_queue);
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skdev->gendisk_on = -1;
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wake_up_interruptible(&skdev->waitq);
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break;
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@ -2275,7 +2214,7 @@ static void skd_start_device(struct skd_device *skdev)
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/*start the queue so we can respond with error to requests */
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dev_dbg(&skdev->pdev->dev,
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"starting queue to error-out reqs\n");
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blk_start_queue(skdev->queue);
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schedule_work(&skdev->start_queue);
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skdev->gendisk_on = -1;
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wake_up_interruptible(&skdev->waitq);
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break;
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@ -2408,7 +2347,7 @@ static int skd_quiesce_dev(struct skd_device *skdev)
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case SKD_DRVR_STATE_BUSY:
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case SKD_DRVR_STATE_BUSY_IMMINENT:
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dev_dbg(&skdev->pdev->dev, "stopping queue\n");
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blk_stop_queue(skdev->queue);
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blk_mq_stop_hw_queues(skdev->queue);
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break;
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case SKD_DRVR_STATE_ONLINE:
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case SKD_DRVR_STATE_STOPPING:
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@ -2473,7 +2412,7 @@ static int skd_unquiesce_dev(struct skd_device *skdev)
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"**** device ONLINE...starting block queue\n");
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dev_dbg(&skdev->pdev->dev, "starting queue\n");
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dev_info(&skdev->pdev->dev, "STEC s1120 ONLINE\n");
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blk_start_queue(skdev->queue);
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schedule_work(&skdev->start_queue);
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skdev->gendisk_on = 1;
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wake_up_interruptible(&skdev->waitq);
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break;
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@ -2537,12 +2476,12 @@ static irqreturn_t skd_comp_q(int irq, void *skd_host_data)
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deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit,
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&flush_enqueued);
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if (flush_enqueued)
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blk_run_queue_async(skdev->queue);
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schedule_work(&skdev->start_queue);
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if (deferred)
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schedule_work(&skdev->completion_worker);
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else if (!flush_enqueued)
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blk_run_queue_async(skdev->queue);
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schedule_work(&skdev->start_queue);
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spin_unlock_irqrestore(&skdev->lock, flags);
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@ -2843,9 +2782,10 @@ static void skd_free_sg_list(struct skd_device *skdev,
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pci_free_consistent(skdev->pdev, nbytes, sg_list, dma_addr);
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}
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static int skd_init_rq(struct request_queue *q, struct request *rq, gfp_t gfp)
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static int skd_init_request(struct blk_mq_tag_set *set, struct request *rq,
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unsigned int hctx_idx, unsigned int numa_node)
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{
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struct skd_device *skdev = q->queuedata;
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struct skd_device *skdev = set->driver_data;
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struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
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skreq->state = SKD_REQ_STATE_IDLE;
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||||
|
@ -2857,9 +2797,10 @@ static int skd_init_rq(struct request_queue *q, struct request *rq, gfp_t gfp)
|
|||
return skreq->sksg_list ? 0 : -ENOMEM;
|
||||
}
|
||||
|
||||
static void skd_exit_rq(struct request_queue *q, struct request *rq)
|
||||
static void skd_exit_request(struct blk_mq_tag_set *set, struct request *rq,
|
||||
unsigned int hctx_idx)
|
||||
{
|
||||
struct skd_device *skdev = q->queuedata;
|
||||
struct skd_device *skdev = set->driver_data;
|
||||
struct skd_request_context *skreq = blk_mq_rq_to_pdu(rq);
|
||||
|
||||
skd_free_sg_list(skdev, skreq->sksg_list,
|
||||
|
@ -2911,6 +2852,12 @@ static int skd_cons_sksb(struct skd_device *skdev)
|
|||
return rc;
|
||||
}
|
||||
|
||||
static const struct blk_mq_ops skd_mq_ops = {
|
||||
.queue_rq = skd_mq_queue_rq,
|
||||
.init_request = skd_init_request,
|
||||
.exit_request = skd_exit_request,
|
||||
};
|
||||
|
||||
static int skd_cons_disk(struct skd_device *skdev)
|
||||
{
|
||||
int rc = 0;
|
||||
|
@ -2932,27 +2879,30 @@ static int skd_cons_disk(struct skd_device *skdev)
|
|||
disk->fops = &skd_blockdev_ops;
|
||||
disk->private_data = skdev;
|
||||
|
||||
q = blk_alloc_queue_node(GFP_KERNEL, NUMA_NO_NODE);
|
||||
q = NULL;
|
||||
memset(&skdev->tag_set, 0, sizeof(skdev->tag_set));
|
||||
skdev->tag_set.ops = &skd_mq_ops;
|
||||
skdev->tag_set.nr_hw_queues = 1;
|
||||
skdev->tag_set.queue_depth = skd_max_queue_depth;
|
||||
skdev->tag_set.cmd_size = sizeof(struct skd_request_context) +
|
||||
skdev->sgs_per_request * sizeof(struct scatterlist);
|
||||
skdev->tag_set.numa_node = NUMA_NO_NODE;
|
||||
skdev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE |
|
||||
BLK_MQ_F_SG_MERGE |
|
||||
BLK_ALLOC_POLICY_TO_MQ_FLAG(BLK_TAG_ALLOC_FIFO);
|
||||
skdev->tag_set.driver_data = skdev;
|
||||
if (blk_mq_alloc_tag_set(&skdev->tag_set) >= 0) {
|
||||
q = blk_mq_init_queue(&skdev->tag_set);
|
||||
if (!q)
|
||||
blk_mq_free_tag_set(&skdev->tag_set);
|
||||
}
|
||||
if (!q) {
|
||||
rc = -ENOMEM;
|
||||
goto err_out;
|
||||
}
|
||||
blk_queue_bounce_limit(q, BLK_BOUNCE_HIGH);
|
||||
q->queuedata = skdev;
|
||||
q->request_fn = skd_request_fn;
|
||||
q->queue_lock = &skdev->lock;
|
||||
q->nr_requests = skd_max_queue_depth / 2;
|
||||
q->cmd_size = sizeof(struct skd_request_context) +
|
||||
skdev->sgs_per_request * sizeof(struct scatterlist);
|
||||
q->init_rq_fn = skd_init_rq;
|
||||
q->exit_rq_fn = skd_exit_rq;
|
||||
rc = blk_init_allocated_queue(q);
|
||||
if (rc < 0)
|
||||
goto cleanup_q;
|
||||
rc = blk_queue_init_tags(q, skd_max_queue_depth, NULL,
|
||||
BLK_TAG_ALLOC_FIFO);
|
||||
if (rc < 0)
|
||||
goto cleanup_q;
|
||||
|
||||
skdev->queue = q;
|
||||
disk->queue = q;
|
||||
|
@ -2969,15 +2919,11 @@ static int skd_cons_disk(struct skd_device *skdev)
|
|||
|
||||
spin_lock_irqsave(&skdev->lock, flags);
|
||||
dev_dbg(&skdev->pdev->dev, "stopping queue\n");
|
||||
blk_stop_queue(skdev->queue);
|
||||
blk_mq_stop_hw_queues(skdev->queue);
|
||||
spin_unlock_irqrestore(&skdev->lock, flags);
|
||||
|
||||
err_out:
|
||||
return rc;
|
||||
|
||||
cleanup_q:
|
||||
blk_cleanup_queue(q);
|
||||
goto err_out;
|
||||
}
|
||||
|
||||
#define SKD_N_DEV_TABLE 16u
|
||||
|
@ -3012,6 +2958,7 @@ static struct skd_device *skd_construct(struct pci_dev *pdev)
|
|||
|
||||
spin_lock_init(&skdev->lock);
|
||||
|
||||
INIT_WORK(&skdev->start_queue, skd_start_queue);
|
||||
INIT_WORK(&skdev->completion_worker, skd_completion_worker);
|
||||
|
||||
dev_dbg(&skdev->pdev->dev, "skcomp\n");
|
||||
|
@ -3130,6 +3077,9 @@ static void skd_free_disk(struct skd_device *skdev)
|
|||
disk->queue = NULL;
|
||||
}
|
||||
|
||||
if (skdev->tag_set.tags)
|
||||
blk_mq_free_tag_set(&skdev->tag_set);
|
||||
|
||||
put_disk(disk);
|
||||
skdev->disk = NULL;
|
||||
}
|
||||
|
@ -3139,6 +3089,8 @@ static void skd_destruct(struct skd_device *skdev)
|
|||
if (skdev == NULL)
|
||||
return;
|
||||
|
||||
cancel_work_sync(&skdev->start_queue);
|
||||
|
||||
dev_dbg(&skdev->pdev->dev, "disk\n");
|
||||
skd_free_disk(skdev);
|
||||
|
||||
|
@ -3682,6 +3634,7 @@ static void skd_log_skreq(struct skd_device *skdev,
|
|||
skreq->fitmsg_id);
|
||||
dev_dbg(&skdev->pdev->dev, " timo=0x%x sg_dir=%d n_sg=%d\n",
|
||||
skreq->timeout_stamp, skreq->data_dir, skreq->n_sg);
|
||||
|
||||
dev_dbg(&skdev->pdev->dev,
|
||||
"req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n", req, lba, lba,
|
||||
count, count, (int)rq_data_dir(req));
|
||||
|
|
Loading…
Reference in a new issue