@@ -206,6 +206,12 @@ Currently, the types available are:
- The device is able to perform parity check using RAID6 P+Q
algorithm against a memory buffer.
+- DMA_MEMSET
+
+ - The device is able to fill memory with the provided pattern
+
+ - The pattern is treated as a single byte signed value.
+
- DMA_INTERRUPT
- The device is able to trigger a dummy transfer that will
@@ -1031,6 +1031,14 @@ static inline struct dma_async_tx_descriptor *dmaengine_prep_interleaved_dma(
return chan->device->device_prep_interleaved_dma(chan, xt, flags);
}
+/**
+ * dmaengine_prep_dma_memset() - Prepare a DMA memset descriptor.
+ * @chan: The channel to be used for this descriptor
+ * @dest: Address of buffer to be set
+ * @value: Treated as a single byte value that fills the destination buffer
+ * @len: The total size of dest
+ * @flags: DMA engine flags
+ */
static inline struct dma_async_tx_descriptor *dmaengine_prep_dma_memset(
struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
unsigned long flags)
Document this function to make clear the expected behavior of the 'value' parameter. It was intended to match the behavior of POSIX memset as laid out here: https://lore.kernel.org/dmaengine/YejrA5ZWZ3lTRO%2F1@matsya/ Signed-off-by: Ben Walker <benjamin.walker@intel.com> --- Documentation/driver-api/dmaengine/provider.rst | 6 ++++++ include/linux/dmaengine.h | 8 ++++++++ 2 files changed, 14 insertions(+)