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dmaengine: add dmaengine_get_provider_device() API

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Add dmaengine_get_provider_device() API and kernel doc for
dmaengine_get_dma_device() to describe the difference.

dmaengine_get_dma_device() is used for DMA mapping because some DMA
engines provide per-channel iommu mapping.

dmaengine_get_provider_device() is used to find a DMA engine channel
by a filter function.

In most cases they return the same value, but they have different
semantic meanings.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20261002202341.253152-1-Frank.Li@oss.nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Frank Li 2026-10-02 16:23:40 -04:00 committed by Vinod Koul
parent bff69558d6
commit 61527d7e69
2 changed files with 24 additions and 3 deletions
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6
include/linux/dma/imx-dma.h
View File

@ -59,8 +59,10 @@ struct imx_dma_data {
static inline int imx_dma_is_general_purpose(struct dma_chan *chan)
{
return !strcmp(chan->device->dev->driver->name, "imx-sdma") ||
!strcmp(chan->device->dev->driver->name, "imx-dma");
struct device *dev = dmaengine_get_provider_device(chan);
return !strcmp(dev->driver->name, "imx-sdma") ||
!strcmp(dev->driver->name, "imx-dma");
}
/**

21
include/linux/dmaengine.h
View File

@ -2122,12 +2122,31 @@ static inline struct device *dmaengine_chan_dev(struct dma_chan *chan)
return &chan->chan_dev->device;
}
/*
* dmaengine_get_provider_device() - Get DMA engine provider device. Typical
* use is to find a DMA channel by filter.
* @chan: DMA channel
*
* Return: Pointer to the DMA engine provider device.
*/
static inline struct device *dmaengine_get_provider_device(struct dma_chan *chan)
{
return chan->device->dev;
}
/*
* dmaengine_get_dma_device() - Get DMA device used for DMA mapping. Some
* DMA engines provide per-channel iommu mapping.
* @chan: DMA channel
*
* Return: Pointer to the device used for DMA mapping.
*/
static inline struct device *dmaengine_get_dma_device(struct dma_chan *chan)
{
if (chan->chan_dev->chan_dma_dev)
return dmaengine_chan_dev(chan);
return chan->device->dev;
return dmaengine_get_provider_device(chan);
}
#endif /* DMAENGINE_H */