Commit 8a232c09 authored Jun 05, 2014 by Taniya Das

arm: dma-removed: Add option to skip buffer zeroing



The DMA framework currently zeros all buffers because it (righfully so)
assumes that drivers will soon need to pass the memory to a device.
Some devices/use case may not require zeroed memory and there can
be an increase in performance if we skip the zeroing. Use the
DMA_ATTR_SKIP_ZEROING attr to allow skipping of DMA zeroing.

Change-Id: Ie7a8ae547834c29a6a4f327095e099c53526f3f7
Signed-off-by: Taniya Das <tdas@codeaurora.org>

parent 8363bc8c

drivers/base/dma-removed.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -47,6 +47,7 @@ void removed_alloc(struct device dev, size_t size, dma_addr_t *handle,
		if (WARN_ON(!addr)) {
		dma_release_from_contiguous(dev, pfn, order);
		} else {
		if (!dma_get_attr(DMA_ATTR_SKIP_ZEROING, attrs))
		memset(addr, 0, size);
		if (no_kernel_mapping) {
		iounmap(addr);