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Commit f39b948d authored by Huang Shijie's avatar Huang Shijie Committed by Vinod Koul
Browse files

dmaengine: add a new helper dmaenginem_async_device_register 



This patch adds the dmaenginem_async_device_register for DMA code.
Use the Devres to call the release for the DMA engine driver.

Signed-off-by: default avatarHuang Shijie <sjhuang@iluvatar.ai>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent ec8ca8e3

Documentation/driver-model/devres.txt

+1 −0
Original line number Diff line number Diff line
@@ -240,6 +240,7 @@ CLOCK 
  devm_of_clk_add_hw_provider()



DMA

  dmaenginem_async_device_register()

  dmam_alloc_coherent()

  dmam_alloc_attrs()

  dmam_declare_coherent_memory()

drivers/dma/dmaengine.c

+35 −0
Original line number Diff line number Diff line
@@ -1141,6 +1141,41 @@ void dma_async_device_unregister(struct dma_device *device) 
}

EXPORT_SYMBOL(dma_async_device_unregister);



static void dmam_device_release(struct device *dev, void *res)

{

	struct dma_device *device;



	device = *(struct dma_device **)res;

	dma_async_device_unregister(device);

}



/**

 * dmaenginem_async_device_register - registers DMA devices found

 * @device: &dma_device

 *

 * The operation is managed and will be undone on driver detach.

 */

int dmaenginem_async_device_register(struct dma_device *device)

{

	void *p;

	int ret;



	p = devres_alloc(dmam_device_release, sizeof(void *), GFP_KERNEL);

	if (!p)

		return -ENOMEM;



	ret = dma_async_device_register(device);

	if (!ret) {

		*(struct dma_device **)p = device;

		devres_add(device->dev, p);

	} else {

		devres_free(p);

	}



	return ret;

}

EXPORT_SYMBOL(dmaenginem_async_device_register);



struct dmaengine_unmap_pool {

	struct kmem_cache *cache;

	const char *name;

include/linux/dmaengine.h

+1 −0
Original line number Diff line number Diff line
@@ -1406,6 +1406,7 @@ static inline int dmaengine_desc_free(struct dma_async_tx_descriptor *desc) 
/* --- DMA device --- */



int dma_async_device_register(struct dma_device *device);

int dmaenginem_async_device_register(struct dma_device *device);

void dma_async_device_unregister(struct dma_device *device);

void dma_run_dependencies(struct dma_async_tx_descriptor *tx);

struct dma_chan *dma_get_slave_channel(struct dma_chan *chan);