When allocating memory to perform non-coherent DMA, use the cache writeback granularity rather than the data cache linesize for alignment. This prevents the explicit cache management from corrupting unrelated adjacent data if the cache writeback granularity exceeds the cache linesize.
Reported-by: Mark Rutland <[email protected]> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <[email protected]> --- ArmPkg/Library/ArmDmaLib/ArmDmaLib.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c index 12b194046ae7..7e352e665a30 100755 --- a/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c +++ b/ArmPkg/Library/ArmDmaLib/ArmDmaLib.c @@ -277,7 +277,7 @@ ArmDmaLibConstructor ( Status = gBS->LocateProtocol (&gEfiCpuArchProtocolGuid, NULL, (VOID **)&gCpu); ASSERT_EFI_ERROR(Status); - gCacheAlignment = ArmDataCacheLineLength (); + gCacheAlignment = ArmCacheWritebackGranularity (); return Status; } -- 1.9.1 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
