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memremap: add MEMREMAP_WC flag

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Add a flag to memremap() for writecombine mappings.  Mappings satisfied
by this flag will not be cached, however writes may be delayed or
combined into more efficient bursts.  This is most suitable for buffers
written sequentially by the CPU for use by other DMA devices.

Signed-off-by: Brian Starkey <brian.starkey@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Brian Starkey 2016-03-22 14:28:00 -07:00 • committed by Linus Torvalds
parent cf61e2a148
commit c907e0eb43
2 changed files with 12 additions and 2 deletions
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1
include/linux/io.h
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@ -135,6 +135,7 @@ enum {
/* See memremap() kernel-doc for usage description... */
MEMREMAP_WB = 1 << 0,
MEMREMAP_WT = 1 << 1,
MEMREMAP_WC = 1 << 2,
};
void *memremap(resource_size_t offset, size_t size, unsigned long flags);