[Mesa-dev] [PATCH] ac/radeonsi: fix CIK copy max size

[Bas Nieuwenhuizen]

Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>
On Wed, Aug 29, 2018 at 5:53 AM Dave Airlie <airlied at gmail.com> wrote:
>
> From: Dave Airlie <airlied at redhat.com>
>
> While adding transfer queues to radv, I started writing some tests,
> the first test I wrote fell over copying a buffer larger than this
> limit.
>
> Checked AMDVLK and found the correct limit.
>
> Cc: <mesa-stable at lists.freedesktop.org>
> ---
>  src/amd/common/sid.h | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/src/amd/common/sid.h b/src/amd/common/sid.h
> index 0671f7d3998..edb7d06afa6 100644
> --- a/src/amd/common/sid.h
> +++ b/src/amd/common/sid.h
> @@ -9139,7 +9139,9 @@
>  #define    CIK_SDMA_PACKET_SEMAPHORE               0x7
>  #define    CIK_SDMA_PACKET_CONSTANT_FILL           0xb
>  #define    CIK_SDMA_PACKET_SRBM_WRITE              0xe
> -#define    CIK_SDMA_COPY_MAX_SIZE                  0x3fffe0
> +/* There is apparently an undocumented HW "feature" that
> +   prevents the HW from copying past 256 bytes of (1 << 22) */
> +#define    CIK_SDMA_COPY_MAX_SIZE                  0x3fff00
>
>  enum amd_cmp_class_flags {
>         S_NAN = 1 << 0,        // Signaling NaN
> --
> 2.17.1
>
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