dmaengine Archive on lore.kernel.org
 help / color / Atom feed
* [RESEND] dmaengine: dmatest: Add support for completion polling
@ 2019-07-31  7:14 Peter Ujfalusi
  0 siblings, 0 replies; only message in thread
From: Peter Ujfalusi @ 2019-07-31  7:14 UTC (permalink / raw)
  To: vkoul; +Cc: dan.j.williams, dmaengine, andriy.shevchenko

With the polled parameter the DMA drivers can be tested if they can work
correctly when no completion is requested (no DMA_PREP_INTERRUPT and no
callback is provided).

If polled mode is selected then use dma_sync_wait() to execute the test
iteration instead of relying on the completion callback.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
Vinod,

no changes since v1, but rebased it on linux-next to make sure it applies
cleanly.

v1: https://patchwork.kernel.org/patch/10966499/

Regards,
Peter

 drivers/dma/dmatest.c | 35 ++++++++++++++++++++++++++++-------
 1 file changed, 28 insertions(+), 7 deletions(-)

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 3d22ae8dca72..a2cadfa2e6d7 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -72,6 +72,10 @@ static bool norandom;
 module_param(norandom, bool, 0644);
 MODULE_PARM_DESC(norandom, "Disable random offset setup (default: random)");
 
+static bool polled;
+module_param(polled, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(polled, "Use polling for completion instead of interrupts");
+
 static bool verbose;
 module_param(verbose, bool, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)");
@@ -110,6 +114,7 @@ struct dmatest_params {
 	bool		norandom;
 	int		alignment;
 	unsigned int	transfer_size;
+	bool		polled;
 };
 
 /**
@@ -651,7 +656,10 @@ static int dmatest_func(void *data)
 	/*
 	 * src and dst buffers are freed by ourselves below
 	 */
-	flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
+	if (params->polled)
+		flags = DMA_CTRL_ACK;
+	else
+		flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 
 	ktime = ktime_get();
 	while (!kthread_should_stop()
@@ -780,8 +788,10 @@ static int dmatest_func(void *data)
 		}
 
 		done->done = false;
-		tx->callback = dmatest_callback;
-		tx->callback_param = done;
+		if (!params->polled) {
+			tx->callback = dmatest_callback;
+			tx->callback_param = done;
+		}
 		cookie = tx->tx_submit(tx);
 
 		if (dma_submit_error(cookie)) {
@@ -790,12 +800,22 @@ static int dmatest_func(void *data)
 			msleep(100);
 			goto error_unmap_continue;
 		}
-		dma_async_issue_pending(chan);
 
-		wait_event_freezable_timeout(thread->done_wait, done->done,
-					     msecs_to_jiffies(params->timeout));
+		if (params->polled) {
+			status = dma_sync_wait(chan, cookie);
+			dmaengine_terminate_sync(chan);
+			if (status == DMA_COMPLETE)
+				done->done = true;
+		} else {
+			dma_async_issue_pending(chan);
+
+			wait_event_freezable_timeout(thread->done_wait,
+					done->done,
+					msecs_to_jiffies(params->timeout));
 
-		status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
+			status = dma_async_is_tx_complete(chan, cookie, NULL,
+							  NULL);
+		}
 
 		if (!done->done) {
 			result("test timed out", total_tests, src->off, dst->off,
@@ -1065,6 +1085,7 @@ static void add_threaded_test(struct dmatest_info *info)
 	params->norandom = norandom;
 	params->alignment = alignment;
 	params->transfer_size = transfer_size;
+	params->polled = polled;
 
 	request_channels(info, DMA_MEMCPY);
 	request_channels(info, DMA_MEMSET);
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki


^ permalink raw reply	[flat|nested] only message in thread

only message in thread, back to index

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-07-31  7:14 [RESEND] dmaengine: dmatest: Add support for completion polling Peter Ujfalusi

dmaengine Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/dmaengine/0 dmaengine/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dmaengine dmaengine/ https://lore.kernel.org/dmaengine \
		dmaengine@vger.kernel.org dmaengine@archiver.kernel.org
	public-inbox-index dmaengine


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.dmaengine


AGPL code for this site: git clone https://public-inbox.org/ public-inbox