[PATCH] drm/amdgpu: add print for iommu translation mode

[Hamza Mahfooz]

On 3/17/23 15:47, Graham Sider wrote:
> Add log to display whether RAM is direct vs DMA mapped.
> 
> Signed-off-by: Graham Sider <Graham.Sider at amd.com>

If this information is only useful for debugging purposes, please use
drm_dbg() instead of pr_info().

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 8bba5e6872a1..8797a9523244 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -3528,8 +3528,12 @@ static void amdgpu_device_check_iommu_direct_map(struct amdgpu_device *adev)
>   	struct iommu_domain *domain;
>   
>   	domain = iommu_get_domain_for_dev(adev->dev);
> -	if (!domain || domain->type == IOMMU_DOMAIN_IDENTITY)
> +	if (!domain || domain->type == IOMMU_DOMAIN_IDENTITY) {
> +		pr_info("RAM is direct mapped to GPU (not traslated by IOMMU)\n");
>   		adev->ram_is_direct_mapped = true;
> +	} else {
> +		pr_info("RAM is DMA mapped to GPU (translated by IOMMU)\n");
> +	}
>   }
>   
>   static const struct attribute *amdgpu_dev_attributes[] = {

-- 
Hamza