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ANDROID: arm64: mm: perform clean & invalidation in __dma_map_area

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commit c50f11c619 ("arm64: mm: Don't invalidate FROM_DEVICE buffers at
start of DMA transfer") break assumptions of some device drivers about
invalidation that happens as part of __dma_map_area(DMA_FROM_DEVICE). An
example include drivers using dmabuf API dma_buf_begin_cpu_access() and
dma_buf_end_cpu_access() to achieve buffer invalidation. Fix this breakage
by replacing clean with clean and invalidation in __dma_map_area() for
DMA inbound case.

Bug: 260978220
Change-Id: Id1a2750c2036de693cd52e8f7316f1d820b5a262
Fixes: c50f11c619 ("arm64: mm: Don't invalidate FROM_DEVICE buffers at start of DMA transfer")
Signed-off-by: Charan Teja Kalla <quic_charante@quicinc.com>
Signed-off-by: Shiraz Hashim <quic_shashim@quicinc.com>
Signed-off-by: Prakash Gupta <quic_guptap@quicinc.com>
Signed-off-by: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
(cherry picked from commit 8022d8faf64fbf1efba1f134fedc0eba758cdfd0)
This commit is contained in:
Charan Teja Kalla
2022-11-30 16:32:58 +05:30
committed by Gaurav Kohli
parent d0cdb904f9
commit 149320568d
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/mm/cache.S
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@@ -230,6 +230,8 @@ SYM_FUNC_END_PI(__dma_flush_area)
* - dir - DMA direction
*/
SYM_FUNC_START_PI(__dma_map_area)
cmp w2, #DMA_FROM_DEVICE
b.eq __dma_flush_area
add x1, x0, x1
b __dma_clean_area
SYM_FUNC_END_PI(__dma_map_area)