drm/amdgpu: add saved_bo to save vce 4.0 context when suspend

We are using PSP to resume firmware after suspend, and it is
resumed at where it got suspended, so we'd better save the
the context.
Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -34,6 +34,7 @@ struct amdgpu_vce {
 	struct amdgpu_bo	*vcpu_bo;
 	uint64_t		gpu_addr;
 	void			*cpu_addr;
+	void			*saved_bo;
 	unsigned		fw_version;
 	unsigned		fb_version;
 	atomic_t		handles[AMDGPU_MAX_VCE_HANDLES];

drivers/gpu/drm/amd/amdgpu/vce_v4_0.c

@@ -419,15 +419,19 @@ static int vce_v4_0_sw_init(void *handle)
 
 	if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP) {
 		const struct common_firmware_header *hdr;
+		unsigned size = amdgpu_bo_size(adev->vce.vcpu_bo);
+
+		adev->vce.saved_bo = kmalloc(size, GFP_KERNEL);
+		if (!adev->vce.saved_bo)
+			return -ENOMEM;
+
 		hdr = (const struct common_firmware_header *)adev->vce.fw->data;
 		adev->firmware.ucode[AMDGPU_UCODE_ID_VCE].ucode_id = AMDGPU_UCODE_ID_VCE;
 		adev->firmware.ucode[AMDGPU_UCODE_ID_VCE].fw = adev->vce.fw;
 		adev->firmware.fw_size +=
 			ALIGN(le32_to_cpu(hdr->ucode_size_bytes), PAGE_SIZE);
 		DRM_INFO("PSP loading VCE firmware\n");
-	}
-
-	if (adev->firmware.load_type != AMDGPU_FW_LOAD_PSP) {
+	} else {
 		r = amdgpu_vce_resume(adev);
 		if (r)
 			return r;
@@ -466,6 +470,11 @@ static int vce_v4_0_sw_fini(void *handle)
 	/* free MM table */
 	amdgpu_virt_free_mm_table(adev);
 
+	if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP) {
+		kfree(adev->vce.saved_bo);
+		adev->vce.saved_bo = NULL;
+	}
+
 	r = amdgpu_vce_suspend(adev);
 	if (r)
 		return r;
@@ -522,8 +531,18 @@ static int vce_v4_0_hw_fini(void *handle)
 
 static int vce_v4_0_suspend(void *handle)
 {
-	int r;
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	int r;
+
+	if (adev->vce.vcpu_bo == NULL)
+		return 0;
+
+	if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP) {
+		unsigned size = amdgpu_bo_size(adev->vce.vcpu_bo);
+		void *ptr = adev->vce.cpu_addr;
+
+		memcpy_fromio(adev->vce.saved_bo, ptr, size);
+	}
 
 	r = vce_v4_0_hw_fini(adev);
 	if (r)
@@ -534,12 +553,22 @@ static int vce_v4_0_suspend(void *handle)
 
 static int vce_v4_0_resume(void *handle)
 {
-	int r;
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	int r;
 
-	r = amdgpu_vce_resume(adev);
-	if (r)
-		return r;
+	if (adev->vce.vcpu_bo == NULL)
+		return -EINVAL;
+
+	if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP) {
+		unsigned size = amdgpu_bo_size(adev->vce.vcpu_bo);
+		void *ptr = adev->vce.cpu_addr;
+
+		memcpy_toio(ptr, adev->vce.saved_bo, size);
+	} else {
+		r = amdgpu_vce_resume(adev);
+		if (r)
+			return r;
+	}
 
 	return vce_v4_0_hw_init(adev);
 }