[PATCH 08/21] riscv: dma-mapping: only invalidate after DMA, not flush
Lad, Prabhakar
prabhakar.csengg at gmail.com
Thu Mar 30 05:59:06 PDT 2023
On Mon, Mar 27, 2023 at 1:16 PM Arnd Bergmann <arnd at kernel.org> wrote:
>
> From: Arnd Bergmann <arnd at arndb.de>
>
> No other architecture intentionally writes back dirty cache lines into
> a buffer that a device has just finished writing into. If the cache is
> clean, this has no effect at all, but if a cacheline in the buffer has
> actually been written by the CPU, there is a drive bug that is likely
> made worse by overwriting that buffer.
>
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
> ---
> arch/riscv/mm/dma-noncoherent.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj at bp.renesas.com>
Cheers,
Prabhakar
> diff --git a/arch/riscv/mm/dma-noncoherent.c b/arch/riscv/mm/dma-noncoherent.c
> index d919efab6eba..640f4c496d26 100644
> --- a/arch/riscv/mm/dma-noncoherent.c
> +++ b/arch/riscv/mm/dma-noncoherent.c
> @@ -42,7 +42,7 @@ void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
> break;
> case DMA_FROM_DEVICE:
> case DMA_BIDIRECTIONAL:
> - ALT_CMO_OP(flush, vaddr, size, riscv_cbom_block_size);
> + ALT_CMO_OP(inval, vaddr, size, riscv_cbom_block_size);
> break;
> default:
> break;
> --
> 2.39.2
>
>
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