[PATCH] drm/amdgpu: sriov restrict max_pfn below AMDGPU_GMC_HOLE

[Christian König]

Am 24.01.19 um 04:38 schrieb wentalou:
> sriov need to restrict max_pfn below AMDGPU_GMC_HOLE.
> access the hole results in a range fault interrupt IIRC.
>
> Change-Id: I0add197a24a54388a128a545056e9a9f0330abfb
> Signed-off-by: Wentao Lou <Wentao.Lou at amd.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c | 3 +--
>   drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c   | 6 +++++-
>   2 files changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
> index dd3bd01..7e22be7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_csa.c
> @@ -26,8 +26,7 @@
>   
>   uint64_t amdgpu_csa_vaddr(struct amdgpu_device *adev)
>   {
> -	uint64_t addr = min(adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT,
> -				AMDGPU_GMC_HOLE_START);
> +	uint64_t addr = adev->vm_manager.max_pfn << AMDGPU_GPU_PAGE_SHIFT;
>   
>   	addr -= AMDGPU_VA_RESERVED_SIZE;
>   	addr = amdgpu_gmc_sign_extend(addr);
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> index 9c082f9..600259b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
> @@ -965,7 +965,11 @@ static int gmc_v9_0_sw_init(void *handle)
>   		 * vm size is 256TB (48bit), maximum size of Vega10,
>   		 * block size 512 (9bit)
>   		 */
> -		amdgpu_vm_adjust_size(adev, 256 * 1024, 9, 3, 48);
> +		/* sriov restrict max_pfn below AMDGPU_GMC_HOLE */
> +		if (amdgpu_sriov_vf(adev))
> +			amdgpu_vm_adjust_size(adev, 256 * 1024, 9, 3, 47);
> +		else
> +			amdgpu_vm_adjust_size(adev, 256 * 1024, 9, 3, 48);
>   		break;
>   	default:
>   		break;