drm/amdgpu: IOCTL interface for PRT support v4

Till GFX8 we can only enable PRT support globally, but with the next hardware
generation we can do this on a per page basis.

Keep the interface consistent by adding PRT mappings and enable
support globally on current hardware when the first mapping is made.

v2: disable PRT support delayed and on all error paths
v3: PRT and other permissions are mutal exclusive,
    PRT mappings don't need a BO.
v4: update PRT mappings durign CS as well, make va_flags 64bit

Signed-off-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 61d94c745672..49f93ee019e3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -655,6 +655,14 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
                 goto out_suspend;
         }
 
+        fpriv->prt_va = amdgpu_vm_bo_add(adev, &fpriv->vm, NULL);
+        if (!fpriv->prt_va) {
+                r = -ENOMEM;
+                amdgpu_vm_fini(adev, &fpriv->vm);
+                kfree(fpriv);
+                goto out_suspend;
+        }
+
         if (amdgpu_sriov_vf(adev)) {
                 r = amdgpu_map_static_csa(adev, &fpriv->vm);
                 if (r)
@@ -699,6 +707,8 @@ void amdgpu_driver_postclose_kms(struct drm_device *dev,
         amdgpu_uvd_free_handles(adev, file_priv);
         amdgpu_vce_free_handles(adev, file_priv);
 
+        amdgpu_vm_bo_rmv(adev, fpriv->prt_va);
+
         if (amdgpu_sriov_vf(adev)) {
                 /* TODO: how to handle reserve failure */
                 BUG_ON(amdgpu_bo_reserve(adev->virt.csa_obj, false));