On 2023-03-20 10:08, Graham Sider wrote:
Add log to display whether RAM is direct vs DMA mapped.
Signed-off-by: Graham Sider <Graham.Sider@xxxxxxx>
Acked-by: Felix Kuehling <Felix.Kuehling@xxxxxxx>
---
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[] = {
