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Groups > linux.kernel > #1597101
| From | Vladimir Murzin <vladimir.murzin@arm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v3 6/7] ARM: NOMMU: Set ARM_DMA_MEM_BUFFERABLE for M-class cpus |
| Date | 2017-03-10 12:00 +0100 |
| Message-ID | <tjqra-2Qu-73@gated-at.bofh.it> (permalink) |
| References | <tjp23-1S9-65@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Now, we have dedicated non-cacheable region for consistent DMA operations. However, that region can still be marked as bufferable by MPU, so it'd be safer to have barriers by default. Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Tested-by: Andras Szemzo <sza@esh.hu> Tested-by: Alexandre TORGUE <alexandre.torgue@st.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com> --- arch/arm/mm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index d731f28..7dd46ae 100644 --- a/arch/arm/mm/Kconfig +++ b/arch/arm/mm/Kconfig @@ -1050,7 +1050,7 @@ config ARM_L1_CACHE_SHIFT config ARM_DMA_MEM_BUFFERABLE bool "Use non-cacheable memory for DMA" if (CPU_V6 || CPU_V6K) && !CPU_V7 - default y if CPU_V6 || CPU_V6K || CPU_V7 + default y if CPU_V6 || CPU_V6K || CPU_V7 || CPU_V7M help Historically, the kernel has used strongly ordered mappings to provide DMA coherent memory. With the advent of ARMv7, mapping -- 2.0.0
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[PATCH v3 0/7] ARM: Fix dma_alloc_coherent() and friends for NOMMU Vladimir Murzin <vladimir.murzin@arm.com> - 2017-03-10 10:30 +0100 [PATCH v3 7/7] ARM: dma-mapping: Remove traces of NOMMU code Vladimir Murzin <vladimir.murzin@arm.com> - 2017-03-10 12:00 +0100 [PATCH v3 1/7] dma: Take into account dma_pfn_offset Vladimir Murzin <vladimir.murzin@arm.com> - 2017-03-10 12:00 +0100 [PATCH v3 2/7] dma: Add simple dma_noop_mmap Vladimir Murzin <vladimir.murzin@arm.com> - 2017-03-10 12:00 +0100 [PATCH v3 6/7] ARM: NOMMU: Set ARM_DMA_MEM_BUFFERABLE for M-class cpus Vladimir Murzin <vladimir.murzin@arm.com> - 2017-03-10 12:00 +0100
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