diff options
| author | Kefeng Wang <[email protected]> | 2022-05-23 19:31:25 +0800 |
|---|---|---|
| committer | Will Deacon <[email protected]> | 2022-06-23 18:34:58 +0100 |
| commit | ed59dfd9509d172e4920994ed9cbebf93b0050cc (patch) | |
| tree | 836859cb481958c930fc01482806bce7126ba36c /include | |
| parent | a111daf0c53ae91e71fd2bfe7497862d14132e3e (diff) | |
asm-generic: Add memory barrier dma_mb()
The memory barrier dma_mb() is introduced by commit a76a37777f2c
("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 <[email protected]> # for asm-generic
Signed-off-by: Kefeng Wang <[email protected]>
Reviewed-by: Marco Elver <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/barrier.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h index fd7e8fbaeef1..961f4d88f9ef 100644 --- a/include/asm-generic/barrier.h +++ b/include/asm-generic/barrier.h @@ -38,6 +38,10 @@ #define wmb() do { kcsan_wmb(); __wmb(); } while (0) #endif +#ifdef __dma_mb +#define dma_mb() do { kcsan_mb(); __dma_mb(); } while (0) +#endif + #ifdef __dma_rmb #define dma_rmb() do { kcsan_rmb(); __dma_rmb(); } while (0) #endif @@ -65,6 +69,10 @@ #define wmb() mb() #endif +#ifndef dma_mb +#define dma_mb() mb() +#endif + #ifndef dma_rmb #define dma_rmb() rmb() #endif |