[PATCH v2] drm/amdgpu: add print for iommu translation mode

[Graham Sider]

Add log to display whether RAM is direct vs DMA mapped.

Signed-off-by: Graham Sider <Graham.Sider at amd.com>
---
 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 3bd6c5aef796..83774824694b 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) {
+		dev_info(adev->dev, "RAM is direct mapped to GPU (not translated by IOMMU)\n");
 		adev->ram_is_direct_mapped = true;
+	} else {
+		dev_info(adev->dev, "RAM is DMA mapped to GPU (translated by IOMMU)\n");
+	}
 }
 
 static const struct attribute *amdgpu_dev_attributes[] = {
-- 
2.25.1