iio: buffer-dma: support getting the DMA channel

commit f9c198c3ccaf90a1a265fb2ffa8d4b093c3b0784 upstream.

Implement the .get_dma_dev() callback for DMA buffers by returning the
device that owns the DMA channel. This allows the core DMABUF
infrastructure to properly map DMA buffers using the correct device,
avoiding the need for bounce buffers on systems where memory is mapped
above the 32-bit range.

The function returns the DMA queue's device, which is the actual device
responsible for DMA operations in buffer-dma implementations.

Cc: stable@vger.kernel.org
Reviewed-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/buffer/industrialio-buffer-dma.c b/drivers/iio/buffer/industrialio-buffer-dma.c
index dbde1443d6ede552fdf1fe0915686735c971f898..1f547de4bcc22696140f4cf79362dc62c4db08e7 100644 (file)
--- a/drivers/iio/buffer/industrialio-buffer-dma.c
+++ b/drivers/iio/buffer/industrialio-buffer-dma.c
@@ -786,6 +786,12 @@ out_end_signalling:
 }
 EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_enqueue_dmabuf, IIO_DMA_BUFFER);
 
+struct device *iio_dma_buffer_get_dma_dev(struct iio_buffer *buffer)
+{
+       return iio_buffer_to_queue(buffer)->dev;
+}
+EXPORT_SYMBOL_NS_GPL(iio_dma_buffer_get_dma_dev, IIO_DMA_BUFFER);
+
 void iio_dma_buffer_lock_queue(struct iio_buffer *buffer)
 {
        struct iio_dma_buffer_queue *queue = iio_buffer_to_queue(buffer);

diff --git a/include/linux/iio/buffer-dma.h b/include/linux/iio/buffer-dma.h
index 5eb66a3990021afb1821297e540656a65916daa7..4f33e6a39797d3ecfddc69c11d6d3985b9212920 100644 (file)
--- a/include/linux/iio/buffer-dma.h
+++ b/include/linux/iio/buffer-dma.h
@@ -174,5 +174,6 @@ int iio_dma_buffer_enqueue_dmabuf(struct iio_buffer *buffer,
                                  size_t size, bool cyclic);
 void iio_dma_buffer_lock_queue(struct iio_buffer *buffer);
 void iio_dma_buffer_unlock_queue(struct iio_buffer *buffer);
+struct device *iio_dma_buffer_get_dma_dev(struct iio_buffer *buffer);
 
 #endif