asm-generic: Add memory barrier dma_mb()

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The memory barrier dma_mb() is introduced by commit a76a37777f
("iommu/arm-smmu-v3: Ensure queue is read after updating prod pointer"),
which is used to ensure that prior (both reads and writes) accesses
to memory by a CPU are ordered w.r.t. a subsequent MMIO write.

Reviewed-by: Arnd Bergmann <arnd@arndb.de> # for asm-generic
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Marco Elver <elver@google.com>
Link: https://lore.kernel.org/r/20220523113126.171714-2-wangkefeng.wang@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>

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Kefeng Wang 2022-05-23 19:31:25 +08:00 • committed by Will Deacon

parent a111daf0c5

commit ed59dfd950

2 changed files with 14 additions and 5 deletions

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11

Documentation/memory-barriers.txt

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8

include/asm-generic/barrier.h

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