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Commit ea7a8a53 authored by Vinayak Menon's avatar Vinayak Menon
Browse files

drivers: dma-removed: use relaxed memory attributes 



For mapping, dma-removed uses ioremap which on ARM translates
to Device nGnRE. But since the users of dma-removed maps RAM
and does not have restrictions on gathering, reordering, and
speculation while mapped, use ioremap_wc instead. This is
observed to perform better. This patch fixes the variable
address space markings too.

Change-Id: Ic73f38ceb446f19a86cb3f64cbf029a61de6d350
Signed-off-by: default avatarVinayak Menon <vinmenon@codeaurora.org>
parent 67c0cad6

drivers/base/dma-removed.c

+5 −5
Original line number Diff line number Diff line
@@ -223,7 +223,7 @@ void *removed_alloc(struct device *dev, size_t size, dma_addr_t *handle, 
	bool skip_zeroing = attrs & DMA_ATTR_SKIP_ZEROING;

	int pageno;

	unsigned long order;

	void *addr = NULL;

	void __iomem *addr = NULL;

	struct removed_region *dma_mem = dev->removed_mem;

	int nbits;

	unsigned int align;
@@ -261,7 +261,7 @@ void *removed_alloc(struct device *dev, size_t size, dma_addr_t *handle, 
			goto out;

		}



		addr = ioremap(base, size);

		addr = ioremap_wc(base, size);

		if (WARN_ON(!addr)) {

			bitmap_clear(dma_mem->bitmap, pageno, nbits);

		} else {
@@ -355,10 +355,10 @@ void removed_sync_sg_for_device(struct device *dev, 
{

}



void *removed_remap(struct device *dev, void *cpu_addr, dma_addr_t handle,

			size_t size, unsigned long attrs)

static void __iomem *removed_remap(struct device *dev, void *cpu_addr,

			dma_addr_t handle, size_t size, unsigned long attrs)

{

	return ioremap(handle, size);

	return ioremap_wc(handle, size);

}



void removed_unremap(struct device *dev, void *remapped_address, size_t size)