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dmaengine: bcm-sba-raid: Improve sba_issue_pending() run duration

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The pending sba_request list can become very long in real-life usage
(e.g. setting up RAID array) which can cause sba_issue_pending() to
run for long duration.

This patch adds common sba_process_deferred_requests() to process
few completed and pending requests so that it finishes in short
duration. We use this common sba_process_deferred_requests() in
both sba_issue_pending() and sba_receive_message().

Signed-off-by: Anup Patel <anup.patel@broadcom.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Anup Patel 2017-08-22 15:26:58 +05:30 committed by Vinod Koul
parent 5346aafcef
commit f83385142c
1 changed files with 126 additions and 110 deletions
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236
drivers/dma/bcm-sba-raid.c
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@ -277,38 +277,28 @@ static void _sba_free_request(struct sba_device *sba,
sba->reqs_fence = false; sba->reqs_fence = false;
} }
static void sba_received_request(struct sba_request *req) /* Note: Must be called with sba->reqs_lock held */
static void _sba_complete_request(struct sba_device *sba,
struct sba_request *req)
{ {
unsigned long flags; lockdep_assert_held(&sba->reqs_lock);
struct sba_device *sba = req->sba;
spin_lock_irqsave(&sba->reqs_lock, flags);
req->flags &= ~SBA_REQUEST_STATE_MASK;
req->flags |= SBA_REQUEST_STATE_RECEIVED;
list_move_tail(&req->node, &sba->reqs_received_list);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}
static void sba_complete_chained_requests(struct sba_request *req)
{
unsigned long flags;
struct sba_request *nreq;
struct sba_device *sba = req->sba;
spin_lock_irqsave(&sba->reqs_lock, flags);
req->flags &= ~SBA_REQUEST_STATE_MASK; req->flags &= ~SBA_REQUEST_STATE_MASK;
req->flags |= SBA_REQUEST_STATE_COMPLETED; req->flags |= SBA_REQUEST_STATE_COMPLETED;
list_move_tail(&req->node, &sba->reqs_completed_list); list_move_tail(&req->node, &sba->reqs_completed_list);
list_for_each_entry(nreq, &req->next, next) {
nreq->flags &= ~SBA_REQUEST_STATE_MASK;
nreq->flags |= SBA_REQUEST_STATE_COMPLETED;
list_move_tail(&nreq->node, &sba->reqs_completed_list);
}
if (list_empty(&sba->reqs_active_list)) if (list_empty(&sba->reqs_active_list))
sba->reqs_fence = false; sba->reqs_fence = false;
}
spin_unlock_irqrestore(&sba->reqs_lock, flags); /* Note: Must be called with sba->reqs_lock held */
static void _sba_received_request(struct sba_device *sba,
struct sba_request *req)
{
lockdep_assert_held(&sba->reqs_lock);
req->flags &= ~SBA_REQUEST_STATE_MASK;
req->flags |= SBA_REQUEST_STATE_RECEIVED;
list_move_tail(&req->node, &sba->reqs_received_list);
if (list_empty(&sba->reqs_active_list))
sba->reqs_fence = false;
} }
static void sba_free_chained_requests(struct sba_request *req) static void sba_free_chained_requests(struct sba_request *req)
@ -386,26 +376,6 @@ static void sba_cleanup_pending_requests(struct sba_device *sba)
spin_unlock_irqrestore(&sba->reqs_lock, flags); spin_unlock_irqrestore(&sba->reqs_lock, flags);
} }
/* ====== DMAENGINE callbacks ===== */
static void sba_free_chan_resources(struct dma_chan *dchan)
{
/*
* Channel resources are pre-alloced so we just free-up
* whatever we can so that we can re-use pre-alloced
* channel resources next time.
*/
sba_cleanup_nonpending_requests(to_sba_device(dchan));
}
static int sba_device_terminate_all(struct dma_chan *dchan)
{
/* Cleanup all pending requests */
sba_cleanup_pending_requests(to_sba_device(dchan));
return 0;
}
static int sba_send_mbox_request(struct sba_device *sba, static int sba_send_mbox_request(struct sba_device *sba,
struct sba_request *req) struct sba_request *req)
{ {
@ -431,17 +401,27 @@ static int sba_send_mbox_request(struct sba_device *sba,
return 0; return 0;
} }
static void sba_issue_pending(struct dma_chan *dchan) static void sba_process_deferred_requests(struct sba_device *sba)
{ {
int ret; int ret;
u32 count;
unsigned long flags; unsigned long flags;
struct sba_request *req, *req1; struct sba_request *req;
struct sba_device *sba = to_sba_device(dchan); struct dma_async_tx_descriptor *tx;
spin_lock_irqsave(&sba->reqs_lock, flags); spin_lock_irqsave(&sba->reqs_lock, flags);
/* Process all pending request */ /* Count pending requests */
list_for_each_entry_safe(req, req1, &sba->reqs_pending_list, node) { count = 0;
list_for_each_entry(req, &sba->reqs_pending_list, node)
count++;
/* Process pending requests */
while (!list_empty(&sba->reqs_pending_list) && count) {
/* Get the first pending request */
req = list_first_entry(&sba->reqs_pending_list,
struct sba_request, node);
/* Try to make request active */ /* Try to make request active */
if (!_sba_active_request(sba, req)) if (!_sba_active_request(sba, req))
break; break;
@ -456,11 +436,102 @@ static void sba_issue_pending(struct dma_chan *dchan)
_sba_pending_request(sba, req); _sba_pending_request(sba, req);
break; break;
} }
count--;
} }
/* Count completed requests */
count = 0;
list_for_each_entry(req, &sba->reqs_completed_list, node)
count++;
/* Process completed requests */
while (!list_empty(&sba->reqs_completed_list) && count) {
req = list_first_entry(&sba->reqs_completed_list,
struct sba_request, node);
list_del_init(&req->node);
tx = &req->tx;
spin_unlock_irqrestore(&sba->reqs_lock, flags);
WARN_ON(tx->cookie < 0);
if (tx->cookie > 0) {
dma_cookie_complete(tx);
dmaengine_desc_get_callback_invoke(tx, NULL);
dma_descriptor_unmap(tx);
tx->callback = NULL;
tx->callback_result = NULL;
}
dma_run_dependencies(tx);
spin_lock_irqsave(&sba->reqs_lock, flags);
/* If waiting for 'ack' then move to completed list */
if (!async_tx_test_ack(&req->tx))
_sba_complete_request(sba, req);
else
_sba_free_request(sba, req);
count--;
}
/* Re-check pending and completed work */
count = 0;
if (!list_empty(&sba->reqs_pending_list) ||
!list_empty(&sba->reqs_completed_list))
count = 1;
spin_unlock_irqrestore(&sba->reqs_lock, flags); spin_unlock_irqrestore(&sba->reqs_lock, flags);
} }
static void sba_process_received_request(struct sba_device *sba,
struct sba_request *req)
{
unsigned long flags;
spin_lock_irqsave(&sba->reqs_lock, flags);
/* Mark request as received */
_sba_received_request(sba, req);
/* Update request */
if (!atomic_dec_return(&req->first->next_pending_count))
_sba_complete_request(sba, req->first);
if (req->first != req)
_sba_free_request(sba, req);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
}
/* ====== DMAENGINE callbacks ===== */
static void sba_free_chan_resources(struct dma_chan *dchan)
{
/*
* Channel resources are pre-alloced so we just free-up
* whatever we can so that we can re-use pre-alloced
* channel resources next time.
*/
sba_cleanup_nonpending_requests(to_sba_device(dchan));
}
static int sba_device_terminate_all(struct dma_chan *dchan)
{
/* Cleanup all pending requests */
sba_cleanup_pending_requests(to_sba_device(dchan));
return 0;
}
static void sba_issue_pending(struct dma_chan *dchan)
{
struct sba_device *sba = to_sba_device(dchan);
/* Process deferred requests */
sba_process_deferred_requests(sba);
}
static dma_cookie_t sba_tx_submit(struct dma_async_tx_descriptor *tx) static dma_cookie_t sba_tx_submit(struct dma_async_tx_descriptor *tx)
{ {
unsigned long flags; unsigned long flags;
@ -1382,40 +1453,10 @@ fail:
/* ====== Mailbox callbacks ===== */ /* ====== Mailbox callbacks ===== */
static void sba_dma_tx_actions(struct sba_request *req)
{
struct dma_async_tx_descriptor *tx = &req->tx;
WARN_ON(tx->cookie < 0);
if (tx->cookie > 0) {
dma_cookie_complete(tx);
/*
* Call the callback (must not sleep or submit new
* operations to this channel)
*/
if (tx->callback)
tx->callback(tx->callback_param);
dma_descriptor_unmap(tx);
}
/* Run dependent operations */
dma_run_dependencies(tx);
/* If waiting for 'ack' then move to completed list */
if (!async_tx_test_ack(&req->tx))
sba_complete_chained_requests(req);
else
sba_free_chained_requests(req);
}
static void sba_receive_message(struct mbox_client *cl, void *msg) static void sba_receive_message(struct mbox_client *cl, void *msg)
{ {
unsigned long flags;
struct brcm_message *m = msg; struct brcm_message *m = msg;
struct sba_request *req = m->ctx, *req1; struct sba_request *req = m->ctx;
struct sba_device *sba = req->sba; struct sba_device *sba = req->sba;
/* Error count if message has error */ /* Error count if message has error */
@ -1423,36 +1464,11 @@ static void sba_receive_message(struct mbox_client *cl, void *msg)
dev_err(sba->dev, "%s got message with error %d", dev_err(sba->dev, "%s got message with error %d",
dma_chan_name(&sba->dma_chan), m->error); dma_chan_name(&sba->dma_chan), m->error);
/* Mark request as received */ /* Process received request */
sba_received_request(req); sba_process_received_request(sba, req);
/* Wait for all chained requests to be completed */ /* Process deferred requests */
if (atomic_dec_return(&req->first->next_pending_count)) sba_process_deferred_requests(sba);
goto done;
/* Point to first request */
req = req->first;
/* Update request */
if (req->flags & SBA_REQUEST_STATE_RECEIVED)
sba_dma_tx_actions(req);
else
sba_free_chained_requests(req);
spin_lock_irqsave(&sba->reqs_lock, flags);
/* Re-check all completed request waiting for 'ack' */
list_for_each_entry_safe(req, req1, &sba->reqs_completed_list, node) {
spin_unlock_irqrestore(&sba->reqs_lock, flags);
sba_dma_tx_actions(req);
spin_lock_irqsave(&sba->reqs_lock, flags);
}
spin_unlock_irqrestore(&sba->reqs_lock, flags);
done:
/* Try to submit pending request */
sba_issue_pending(&sba->dma_chan);
} }
/* ====== Platform driver routines ===== */ /* ====== Platform driver routines ===== */