drm/amdgpu: stop trying to suspend UVD sessions v2

Saving the current UVD state on suspend and restoring it on resume
just doesn't work reliable. Just close cleanup all sessions on suspend.

Ported from radeon commit "12e49feadff6d7b7ebbe852b36943a71524d8d34".

v2: rebased

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com> (v1)

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -1666,7 +1666,6 @@ struct amdgpu_uvd {
 	struct amdgpu_bo	*vcpu_bo;
 	void			*cpu_addr;
 	uint64_t		gpu_addr;
-	void			*saved_bo;
 	atomic_t		handles[AMDGPU_MAX_UVD_HANDLES];
 	struct drm_file		*filp[AMDGPU_MAX_UVD_HANDLES];
 	struct delayed_work	idle_work;

drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c

@@ -221,31 +221,32 @@ int amdgpu_uvd_sw_fini(struct amdgpu_device *adev)
 
 int amdgpu_uvd_suspend(struct amdgpu_device *adev)
 {
-	unsigned size;
-	void *ptr;
-	const struct common_firmware_header *hdr;
-	int i;
+	struct amdgpu_ring *ring = &adev->uvd.ring;
+	int i, r;
 
 	if (adev->uvd.vcpu_bo == NULL)
 		return 0;
 
-	for (i = 0; i < AMDGPU_MAX_UVD_HANDLES; ++i)
-		if (atomic_read(&adev->uvd.handles[i]))
-			break;
-
-	if (i == AMDGPU_MAX_UVD_HANDLES)
-		return 0;
+	for (i = 0; i < AMDGPU_MAX_UVD_HANDLES; ++i) {
+		uint32_t handle = atomic_read(&adev->uvd.handles[i]);
+		if (handle != 0) {
+			struct fence *fence;
 
-	hdr = (const struct common_firmware_header *)adev->uvd.fw->data;
+			amdgpu_uvd_note_usage(adev);
 
-	size = amdgpu_bo_size(adev->uvd.vcpu_bo);
-	size -= le32_to_cpu(hdr->ucode_size_bytes);
+			r = amdgpu_uvd_get_destroy_msg(ring, handle, &fence);
+			if (r) {
+				DRM_ERROR("Error destroying UVD (%d)!\n", r);
+				continue;
+			}
 
-	ptr = adev->uvd.cpu_addr;
-	ptr += le32_to_cpu(hdr->ucode_size_bytes);
+			fence_wait(fence, false);
+			fence_put(fence);
 
-	adev->uvd.saved_bo = kmalloc(size, GFP_KERNEL);
-	memcpy(adev->uvd.saved_bo, ptr, size);
+			adev->uvd.filp[i] = NULL;
+			atomic_set(&adev->uvd.handles[i], 0);
+		}
+	}
 
 	return 0;
 }
@@ -270,12 +271,7 @@ int amdgpu_uvd_resume(struct amdgpu_device *adev)
 	ptr = adev->uvd.cpu_addr;
 	ptr += le32_to_cpu(hdr->ucode_size_bytes);
 
-	if (adev->uvd.saved_bo != NULL) {
-		memcpy(ptr, adev->uvd.saved_bo, size);
-		kfree(adev->uvd.saved_bo);
-		adev->uvd.saved_bo = NULL;
-	} else
-		memset(ptr, 0, size);
+	memset(ptr, 0, size);
 
 	return 0;
 }