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synced 2024-08-25 02:09:42 +00:00
skd: Convert several per-device scalar variables into atomics
Convert the per-device scalar variables that are protected by the queue lock into atomics such that it becomes safe to access these variables without holding the queue lock. 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>
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parent
f18c17c889
commit
6fbb2de5c9
1 changed files with 37 additions and 31 deletions
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@ -243,7 +243,7 @@ struct skd_device {
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enum skd_drvr_state state;
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u32 drive_state;
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u32 in_flight;
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atomic_t in_flight;
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u32 cur_max_queue_depth;
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u32 queue_low_water_mark;
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u32 dev_max_queue_depth;
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@ -251,8 +251,8 @@ struct skd_device {
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u32 num_fitmsg_context;
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u32 num_req_context;
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u32 timeout_slot[SKD_N_TIMEOUT_SLOT];
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u32 timeout_stamp;
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atomic_t timeout_slot[SKD_N_TIMEOUT_SLOT];
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atomic_t timeout_stamp;
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struct skd_fitmsg_context *skmsg_table;
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struct skd_request_context *skreq_table;
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@ -517,7 +517,8 @@ static void skd_request_fn(struct request_queue *q)
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}
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if (blk_queue_stopped(skdev->queue)) {
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if (skdev->in_flight >= skdev->queue_low_water_mark)
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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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@ -559,9 +560,11 @@ static void skd_request_fn(struct request_queue *q)
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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 (skdev->in_flight >= skdev->cur_max_queue_depth) {
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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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skdev->in_flight, skdev->cur_max_queue_depth);
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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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@ -647,12 +650,12 @@ static void skd_request_fn(struct request_queue *q)
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* Update the active request counts.
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* Capture the timeout timestamp.
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*/
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skreq->timeout_stamp = skdev->timeout_stamp;
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skreq->timeout_stamp = atomic_read(&skdev->timeout_stamp);
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timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
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skdev->timeout_slot[timo_slot]++;
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skdev->in_flight++;
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atomic_inc(&skdev->timeout_slot[timo_slot]);
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atomic_inc(&skdev->in_flight);
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dev_dbg(&skdev->pdev->dev, "req=0x%x busy=%d\n", skreq->id,
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skdev->in_flight);
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atomic_read(&skdev->in_flight));
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/*
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* If the FIT msg buffer is full send it.
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@ -805,22 +808,24 @@ static void skd_timer_tick(ulong arg)
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skd_timer_tick_not_online(skdev);
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goto timer_func_out;
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}
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skdev->timeout_stamp++;
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timo_slot = skdev->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
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timo_slot = atomic_inc_return(&skdev->timeout_stamp) &
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SKD_TIMEOUT_SLOT_MASK;
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/*
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* All requests that happened during the previous use of
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* this slot should be done by now. The previous use was
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* over 7 seconds ago.
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*/
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if (skdev->timeout_slot[timo_slot] == 0)
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if (atomic_read(&skdev->timeout_slot[timo_slot]) == 0)
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goto timer_func_out;
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/* Something is overdue */
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dev_dbg(&skdev->pdev->dev, "found %d timeouts, draining busy=%d\n",
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skdev->timeout_slot[timo_slot], skdev->in_flight);
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atomic_read(&skdev->timeout_slot[timo_slot]),
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atomic_read(&skdev->in_flight));
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dev_err(&skdev->pdev->dev, "Overdue IOs (%d), busy %d\n",
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skdev->timeout_slot[timo_slot], skdev->in_flight);
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atomic_read(&skdev->timeout_slot[timo_slot]),
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atomic_read(&skdev->in_flight));
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skdev->timer_countdown = SKD_DRAINING_TIMO;
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skdev->state = SKD_DRVR_STATE_DRAINING_TIMEOUT;
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@ -900,10 +905,10 @@ static void skd_timer_tick_not_online(struct skd_device *skdev)
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dev_dbg(&skdev->pdev->dev,
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"draining busy [%d] tick[%d] qdb[%d] tmls[%d]\n",
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skdev->timo_slot, skdev->timer_countdown,
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skdev->in_flight,
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skdev->timeout_slot[skdev->timo_slot]);
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atomic_read(&skdev->in_flight),
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atomic_read(&skdev->timeout_slot[skdev->timo_slot]));
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/* if the slot has cleared we can let the I/O continue */
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if (skdev->timeout_slot[skdev->timo_slot] == 0) {
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if (atomic_read(&skdev->timeout_slot[skdev->timo_slot]) == 0) {
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dev_dbg(&skdev->pdev->dev,
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"Slot drained, starting queue.\n");
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skdev->state = SKD_DRVR_STATE_ONLINE;
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@ -1310,7 +1315,7 @@ static void skd_send_fitmsg(struct skd_device *skdev,
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u64 qcmd;
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dev_dbg(&skdev->pdev->dev, "dma address 0x%llx, busy=%d\n",
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skmsg->mb_dma_address, skdev->in_flight);
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skmsg->mb_dma_address, atomic_read(&skdev->in_flight));
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dev_dbg(&skdev->pdev->dev, "msg_buf %p\n", skmsg->msg_buf);
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qcmd = skmsg->mb_dma_address;
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@ -1550,12 +1555,12 @@ static void skd_release_skreq(struct skd_device *skdev,
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* Decrease the number of active requests.
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* Also decrements the count in the timeout slot.
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*/
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SKD_ASSERT(skdev->in_flight > 0);
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skdev->in_flight -= 1;
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SKD_ASSERT(atomic_read(&skdev->in_flight) > 0);
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atomic_dec(&skdev->in_flight);
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timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
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SKD_ASSERT(skdev->timeout_slot[timo_slot] > 0);
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skdev->timeout_slot[timo_slot] -= 1;
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SKD_ASSERT(atomic_read(&skdev->timeout_slot[timo_slot]) > 0);
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atomic_dec(&skdev->timeout_slot[timo_slot]);
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/*
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* Reset backpointer
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@ -1615,8 +1620,8 @@ static int skd_isr_completion_posted(struct skd_device *skdev,
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dev_dbg(&skdev->pdev->dev,
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"cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d busy=%d rbytes=0x%x proto=%d\n",
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skdev->skcomp_cycle, skdev->skcomp_ix, cmp_cycle,
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cmp_cntxt, cmp_status, skdev->in_flight, cmp_bytes,
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skdev->proto_ver);
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cmp_cntxt, cmp_status, atomic_read(&skdev->in_flight),
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cmp_bytes, skdev->proto_ver);
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if (cmp_cycle != skdev->skcomp_cycle) {
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dev_dbg(&skdev->pdev->dev, "end of completions\n");
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@ -1707,8 +1712,8 @@ static int skd_isr_completion_posted(struct skd_device *skdev,
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}
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}
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if ((skdev->state == SKD_DRVR_STATE_PAUSING)
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&& (skdev->in_flight) == 0) {
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if (skdev->state == SKD_DRVR_STATE_PAUSING &&
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atomic_read(&skdev->in_flight) == 0) {
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skdev->state = SKD_DRVR_STATE_PAUSED;
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wake_up_interruptible(&skdev->waitq);
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}
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@ -2053,9 +2058,9 @@ static void skd_recover_requests(struct skd_device *skdev)
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}
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for (i = 0; i < SKD_N_TIMEOUT_SLOT; i++)
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skdev->timeout_slot[i] = 0;
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atomic_set(&skdev->timeout_slot[i], 0);
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skdev->in_flight = 0;
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atomic_set(&skdev->in_flight, 0);
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}
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static void skd_isr_msg_from_dev(struct skd_device *skdev)
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@ -3714,10 +3719,11 @@ static void skd_log_skdev(struct skd_device *skdev, const char *event)
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skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
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skd_skdev_state_to_str(skdev->state), skdev->state);
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dev_dbg(&skdev->pdev->dev, " busy=%d limit=%d dev=%d lowat=%d\n",
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skdev->in_flight, skdev->cur_max_queue_depth,
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atomic_read(&skdev->in_flight), skdev->cur_max_queue_depth,
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skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
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dev_dbg(&skdev->pdev->dev, " timestamp=0x%x cycle=%d cycle_ix=%d\n",
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skdev->timeout_stamp, skdev->skcomp_cycle, skdev->skcomp_ix);
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atomic_read(&skdev->timeout_stamp), skdev->skcomp_cycle,
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skdev->skcomp_ix);
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}
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static void skd_log_skreq(struct skd_device *skdev,
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