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Commit 7e54c564 authored by Sushmita Susheelendra's avatar Sushmita Susheelendra Committed by Lynus Vaz
Browse files

msm: kgsl: Record the cacheability attribute of ion buffers 



Query whether an ion buffer is cached using the dmabuf API
dma_buf_get_flags. Record this information in the memdesc
so that any cache operations requested on the ion buffer
can be honored.

Change-Id: Ie763047260108a8b5b2073b60d7a6e51408ae543
Signed-off-by: default avatarSushmita Susheelendra <ssusheel@codeaurora.org>
parent 34e53ec4

drivers/gpu/msm/kgsl.c

+12 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/compat.h>

#include <linux/ctype.h>

#include <linux/mm.h>

#include <linux/ion.h>

#include <asm/cacheflush.h>

#include <uapi/linux/sched/types.h>
@@ -2352,6 +2353,7 @@ static long _gpuobj_map_dma_buf(struct kgsl_device *device, 
{

	struct kgsl_gpuobj_import_dma_buf buf;

	struct dma_buf *dmabuf;

	unsigned long flags = 0;

	int ret;



	/*
@@ -2382,6 +2384,16 @@ static long _gpuobj_map_dma_buf(struct kgsl_device *device, 
	if (IS_ERR_OR_NULL(dmabuf))

		return (dmabuf == NULL) ? -EINVAL : PTR_ERR(dmabuf);



	/*

	 * ION cache ops are routed through kgsl, so record if the dmabuf is

	 * cached or not in the memdesc. Assume uncached if dma_buf_get_flags

	 * fails.

	 */

	dma_buf_get_flags(dmabuf, &flags);

	if (flags & ION_FLAG_CACHED)

		entry->memdesc.flags |=

			KGSL_CACHEMODE_WRITEBACK << KGSL_CACHEMODE_SHIFT;



	ret = kgsl_setup_dma_buf(device, pagetable, entry, dmabuf);

	if (ret)

		dma_buf_put(dmabuf);