[PATCH] drm/amdgpu: fix ring space allocation for IB scheduling

[Christian König]

Am 15.09.2016 um 20:08 schrieb Alex Deucher:
> GFX IB frame is much bigger than other ring, so set the
> limit larger.
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

Could we rather add some fields to the ring structure to indicate how 
many base + per IB dw we need to allocate?

Probably better than having engine specific code here.

Christian.

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> index 2aa741c..e11e4cf 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
> @@ -152,7 +152,11 @@ int amdgpu_ib_schedule(struct amdgpu_ring *ring, unsigned num_ibs,
>   		return -EINVAL;
>   	}
>   
> -	r = amdgpu_ring_alloc(ring, 256 * num_ibs);
> +	/* GFX DMA frame is much bigger than other rings */
> +	if (ring->type == AMDGPU_RING_TYPE_GFX)
> +		r = amdgpu_ring_alloc(ring, 512 + num_ibs * 16);
> +	else
> +		r = amdgpu_ring_alloc(ring, 256 + num_ibs * 16);
>   	if (r) {
>   		dev_err(adev->dev, "scheduling IB failed (%d).\n", r);
>   		return r;