drm/amdgpu: Add support for reporting VRAM usage

Add functions to report the vram_usage from the amdgpu_device

Signed-off-by: Kent Russell <[e-mail]>
Signed-off-by: Felix Kuehling <[e-mail]>
Reviewed-by: Oded Gabbay <[e-mail]>
Signed-off-by: Oded Gabbay <[e-mail]>

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

···
 	cu_info->max_scratch_slots_per_cu = acu_info.max_scratch_slots_per_cu;
 	cu_info->lds_size = acu_info.lds_size;
 }
+
+uint64_t amdgpu_amdkfd_get_vram_usage(struct kgd_dev *kgd)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)kgd;
+
+	return amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]);
+}

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

···
 
 uint32_t get_max_engine_clock_in_mhz(struct kgd_dev *kgd);
 void get_cu_info(struct kgd_dev *kgd, struct kfd_cu_info *cu_info);
+uint64_t amdgpu_amdkfd_get_vram_usage(struct kgd_dev *kgd);
 
 #define read_user_wptr(mmptr, wptr, dst)				\
 	({								\

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v7.c

···
 	.get_fw_version = get_fw_version,
 	.set_scratch_backing_va = set_scratch_backing_va,
 	.get_tile_config = get_tile_config,
-	.get_cu_info = get_cu_info
+	.get_cu_info = get_cu_info,
+	.get_vram_usage = amdgpu_amdkfd_get_vram_usage
 };
 
 struct kfd2kgd_calls *amdgpu_amdkfd_gfx_7_get_functions(void)

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gfx_v8.c

···
 	.get_fw_version = get_fw_version,
 	.set_scratch_backing_va = set_scratch_backing_va,
 	.get_tile_config = get_tile_config,
-	.get_cu_info = get_cu_info
+	.get_cu_info = get_cu_info,
+	.get_vram_usage = amdgpu_amdkfd_get_vram_usage
 };
 
 struct kfd2kgd_calls *amdgpu_amdkfd_gfx_8_0_get_functions(void)

drivers/gpu/drm/amd/include/kgd_kfd_interface.h

···
  *
  * @get_cu_info: Retrieves activated cu info
  *
+ * @get_vram_usage: Returns current VRAM usage
+ *
  * This structure contains function pointers to services that the kgd driver
  * provides to amdkfd driver.
  *
···
 
 	void (*get_cu_info)(struct kgd_dev *kgd,
 			struct kfd_cu_info *cu_info);
+	uint64_t (*get_vram_usage)(struct kgd_dev *kgd);
 };
 
 /**