[PATCH] drm/amd/amdgpu: Modify sdma instance number

[PATCH] drm/amd/amdgpu: Modify sdma instance number

[Gang Ba]

To upgrade performance in small bar mode, set sdma buffer function
ring and pte function ring to use different instance.

Change-Id: Ida6377914eb68a188f745e63409f344f0ce1a8c4
Signed-off-by: Gang Ba <gaba@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
index 071d6c9..5aca9bb4a 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
@@ -2500,7 +2500,7 @@ static void sdma_v4_0_set_buffer_funcs(struct amdgpu_device *adev)
 {
 	adev->mman.buffer_funcs = &sdma_v4_0_buffer_funcs;
 	if (adev->sdma.has_page_queue && adev->sdma.num_instances > 1)
-		adev->mman.buffer_funcs_ring = &adev->sdma.instance[1].page;
+		adev->mman.buffer_funcs_ring = &adev->sdma.instance[0].page;
 	else
 		adev->mman.buffer_funcs_ring = &adev->sdma.instance[0].ring;
 }
-- 
2.7.4

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Re: [PATCH] drm/amd/amdgpu: Modify sdma instance number

[Christian König]

Am 21.08.19 um 16:32 schrieb Gang Ba:
> To upgrade performance in small bar mode, set sdma buffer function
> ring and pte function ring to use different instance.

NAK, we intentionally reserved the first paging queue here.

I wanted to revert that as well, but in this case you would need to 
revert the whole patch and not just this change.

Just look for the patch adding that line and completely revert it instead.

Regards,
Christian.

>
> Change-Id: Ida6377914eb68a188f745e63409f344f0ce1a8c4
> Signed-off-by: Gang Ba <gaba@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> index 071d6c9..5aca9bb4a 100644
> --- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
> @@ -2500,7 +2500,7 @@ static void sdma_v4_0_set_buffer_funcs(struct amdgpu_device *adev)
>   {
>   	adev->mman.buffer_funcs = &sdma_v4_0_buffer_funcs;
>   	if (adev->sdma.has_page_queue && adev->sdma.num_instances > 1)
> -		adev->mman.buffer_funcs_ring = &adev->sdma.instance[1].page;
> +		adev->mman.buffer_funcs_ring = &adev->sdma.instance[0].page;
>   	else
>   		adev->mman.buffer_funcs_ring = &adev->sdma.instance[0].ring;
>   }

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