[PATCH 08/10] drm/amdkfd: add invalid pages debug at vram migration

[Felix Kuehling]

On 2021-06-21 12:04 p.m., Alex Sierra wrote:
> This is for debug purposes only.
> It conditionally generates partial migrations to test mixed
> CPU/GPU memory domain pages in a prange easily.
>
> Signed-off-by: Alex Sierra <alex.sierra at amd.com>

Reviewed-by: Felix Kuehling <Felix.Kuehling at amd.com>


> ---
>   drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> index 8a3f21d76915..f71f8d7e2b72 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c
> @@ -404,6 +404,20 @@ svm_migrate_copy_to_vram(struct amdgpu_device *adev, struct svm_range *prange,
>   		}
>   	}
>   
> +#ifdef DEBUG_FORCE_MIXED_DOMAINS
> +	for (i = 0, j = 0; i < npages; i += 4, j++) {
> +		if (j & 1)
> +			continue;
> +		svm_migrate_put_vram_page(adev, dst[i]);
> +		migrate->dst[i] = 0;
> +		svm_migrate_put_vram_page(adev, dst[i + 1]);
> +		migrate->dst[i + 1] = 0;
> +		svm_migrate_put_vram_page(adev, dst[i + 2]);
> +		migrate->dst[i + 2] = 0;
> +		svm_migrate_put_vram_page(adev, dst[i + 3]);
> +		migrate->dst[i + 3] = 0;
> +	}
> +#endif
>   out:
>   	return r;
>   }