linux-kernel - [PATCH] dmaengine: zynqmp_dma: Add device

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Date:   Thu, 15 Sep 2022 14:35:16 +0530
From:   Swati Agarwal <swati.agarwal@....com>
To:     <vkoul@...nel.org>, <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <harini.katakam@....com>, <radhey.shyam.pandey@....com>,
        <michal.simek@....com>, <appana.durga.kedareswara.rao@....com>,
        <swati.agarwal@....com>
Subject: [PATCH] dmaengine: zynqmp_dma: Add device_synchronize support

dmaengine_synchronize implementation is required to synchronize proper
termination of current transfers so that any memory resources are not freed
while still in use.

Implement this callback in the driver so that framework can use the same
(in dmaengine_terminate_sync/ dmaengine_synchronize).

Signed-off-by: Swati Agarwal <swati.agarwal@....com>
---
 drivers/dma/xilinx/zynqmp_dma.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c
index a156e5f40fc5..0525caf1f998 100644
--- a/drivers/dma/xilinx/zynqmp_dma.c
+++ b/drivers/dma/xilinx/zynqmp_dma.c
@@ -795,6 +795,17 @@ static int zynqmp_dma_device_terminate_all(struct dma_chan *dchan)
 	return 0;
 }
 
+/**
+ * zynqmp_dma_synchronize - Synchronizes the termination of a transfers to the current context.
+ * @dchan: DMA channel pointer
+ */
+static void zynqmp_dma_synchronize(struct dma_chan *dchan)
+{
+	struct zynqmp_dma_chan *chan = to_chan(dchan);
+
+	tasklet_kill(&chan->tasklet);
+}
+
 /**
  * zynqmp_dma_prep_memcpy - prepare descriptors for memcpy transaction
  * @dchan: DMA channel
@@ -1057,6 +1068,7 @@ static int zynqmp_dma_probe(struct platform_device *pdev)
 	p = &zdev->common;
 	p->device_prep_dma_memcpy = zynqmp_dma_prep_memcpy;
 	p->device_terminate_all = zynqmp_dma_device_terminate_all;
+	p->device_synchronize = zynqmp_dma_synchronize;
 	p->device_issue_pending = zynqmp_dma_issue_pending;
 	p->device_alloc_chan_resources = zynqmp_dma_alloc_chan_resources;
 	p->device_free_chan_resources = zynqmp_dma_free_chan_resources;
-- 
2.17.1