[PATCH 2/2] drm/amdgpu: set vm size as 256TB for Vega10

[Christian König]

Am 29.03.2017 um 10:08 schrieb Junwei Zhang:
> Signed-off-by: Junwei Zhang <Jerry.Zhang at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 1ad1113..4af4ea0 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -1080,6 +1080,11 @@ static void amdgpu_get_block_size(struct amdgpu_device *adev)
>   
>   static void amdgpu_check_vm_size(struct amdgpu_device *adev)
>   {
> +	if (adev->asic_type >= CHIP_VEGA10) {
> +		amdgpu_vm_size = 1U << 18; /* 256TB */
> +		return;
> +	}
> +

NAK, that would break in a mixed environment with APU+Vega10.

Instead just go into gmc_v9_0_sw_init() and set max_pfn = 1ULL << 36 and 
add a comment there why we hardcode this value for Vega10 and later.

Christian.

>   	if (!amdgpu_check_pot_argument(amdgpu_vm_size)) {
>   		dev_warn(adev->dev, "VM size (%d) must be a power of 2\n",
>   			 amdgpu_vm_size);