From: Alex Deucher <alexander.deuc...@amd.com>

If a buffer object is secure, i.e. created with
AMDGPU_GEM_CREATE_ENCRYPTED, then the TMZ bit of
the PTEs that belong the buffer object should be
set.

v1: design and draft the skeletion of TMZ bits setting on PTEs (Alex)
v2: return failure once create secure BO on non-TMZ platform  (Ray)
v3: amdgpu_bo_encrypted() only checks the BO (Luben)
v4: move TMZ flag setting into amdgpu_vm_bo_update  (Christian)

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Reviewed-by: Huang Rui <ray.hu...@amd.com>
Signed-off-by: Huang Rui <ray.hu...@amd.com>
Signed-off-by: Luben Tuikov <luben.tui...@amd.com>
Reviewed-by: Alex Deucher <alexander.deuc...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c    | 12 +++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 11 +++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c     |  5 +++++
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 22eab74..5332104 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -222,7 +222,8 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void 
*data,
                      AMDGPU_GEM_CREATE_CPU_GTT_USWC |
                      AMDGPU_GEM_CREATE_VRAM_CLEARED |
                      AMDGPU_GEM_CREATE_VM_ALWAYS_VALID |
-                     AMDGPU_GEM_CREATE_EXPLICIT_SYNC))
+                     AMDGPU_GEM_CREATE_EXPLICIT_SYNC |
+                     AMDGPU_GEM_CREATE_ENCRYPTED))
 
                return -EINVAL;
 
@@ -230,6 +231,11 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void 
*data,
        if (args->in.domains & ~AMDGPU_GEM_DOMAIN_MASK)
                return -EINVAL;
 
+       if (!adev->tmz.enabled && (flags & AMDGPU_GEM_CREATE_ENCRYPTED)) {
+               DRM_ERROR("Cannot allocate secure buffer while tmz is 
disabled\n");
+               return -EINVAL;
+       }
+
        /* create a gem object to contain this object in */
        if (args->in.domains & (AMDGPU_GEM_DOMAIN_GDS |
            AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA)) {
@@ -251,6 +257,10 @@ int amdgpu_gem_create_ioctl(struct drm_device *dev, void 
*data,
                resv = vm->root.base.bo->tbo.resv;
        }
 
+       if (flags & AMDGPU_GEM_CREATE_ENCRYPTED) {
+               /* XXX: pad out alignment to meet TMZ requirements */
+       }
+
        r = amdgpu_gem_object_create(adev, size, args->in.alignment,
                                     (u32)(0xffffffff & args->in.domains),
                                     flags, ttm_bo_type_device, resv, &gobj);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index 5a3c177..75c7392 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -224,6 +224,17 @@ static inline bool amdgpu_bo_explicit_sync(struct 
amdgpu_bo *bo)
        return bo->flags & AMDGPU_GEM_CREATE_EXPLICIT_SYNC;
 }
 
+/**
+ * amdgpu_bo_encrypted - test if the BO is encrypted
+ * @bo: pointer to a buffer object
+ *
+ * Return true if the buffer object is encrypted, false otherwise.
+ */
+static inline bool amdgpu_bo_encrypted(struct amdgpu_bo *bo)
+{
+       return bo->flags & AMDGPU_GEM_CREATE_ENCRYPTED;
+}
+
 bool amdgpu_bo_is_amdgpu_bo(struct ttm_buffer_object *bo);
 void amdgpu_bo_placement_from_domain(struct amdgpu_bo *abo, u32 domain);
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index b285ab2..8e13b1fd3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -1688,6 +1688,11 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
 
        if (bo) {
                flags = amdgpu_ttm_tt_pte_flags(adev, bo->tbo.ttm, mem);
+
+               if (amdgpu_bo_encrypted(bo)) {
+                       flags |= AMDGPU_PTE_TMZ;
+               }
+
                bo_adev = amdgpu_ttm_adev(bo->tbo.bdev);
        } else {
                flags = 0x0;
-- 
2.7.4

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