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Message-Id: <20240701070232.2519179-3-joy.zou@nxp.com>
Date: Mon, 1 Jul 2024 15:02:32 +0800
From: Joy Zou <joy.zou@....com>
To: Frank.Li@....com,
vkoul@...nel.org
Cc: imx@...ts.linux.dev,
dmaengine@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] dmaengine: fsl-edma: add edma src ID check at request channel
Check src ID to detect misuse of same src ID for multiple DMA channels.
Signed-off-by: Joy Zou <joy.zou@....com>
Reviewed-by: Frank Li <Frank.Li@....com>
---
drivers/dma/fsl-edma-main.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c
index d4f29ece69f5..f9f1eda79254 100644
--- a/drivers/dma/fsl-edma-main.c
+++ b/drivers/dma/fsl-edma-main.c
@@ -100,6 +100,22 @@ static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
return fsl_edma_err_handler(irq, dev_id);
}
+static bool fsl_edma_srcid_in_use(struct fsl_edma_engine *fsl_edma, u32 srcid)
+{
+ struct fsl_edma_chan *fsl_chan;
+ int i;
+
+ for (i = 0; i < fsl_edma->n_chans; i++) {
+ fsl_chan = &fsl_edma->chans[i];
+
+ if (fsl_chan->srcid && srcid == fsl_chan->srcid) {
+ dev_err(&fsl_chan->pdev->dev, "The srcid is in use, can't use!");
+ return true;
+ }
+ }
+ return false;
+}
+
static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
@@ -117,6 +133,10 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) {
if (chan->client_count)
continue;
+
+ if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[1]))
+ return NULL;
+
if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) {
chan = dma_get_slave_channel(chan);
if (chan) {
@@ -161,6 +181,8 @@ static struct dma_chan *fsl_edma3_xlate(struct of_phandle_args *dma_spec,
continue;
fsl_chan = to_fsl_edma_chan(chan);
+ if (fsl_edma_srcid_in_use(fsl_edma, dma_spec->args[0]))
+ return NULL;
i = fsl_chan - fsl_edma->chans;
fsl_chan->priority = dma_spec->args[1];
--
2.37.1
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