Commit 40b6a946 authored by Samuel Zhang's avatar Samuel Zhang Committed by Mario Limonciello
Browse files

drm/ttm: add new api ttm_device_prepare_hibernation() 



This new api is used for hibernation to move GTT BOs to shmem after
VRAM eviction. shmem will be flushed to swap disk later to reduce
the system memory usage for hibernation.

Signed-off-by: default avatarSamuel Zhang <guoqing.zhang@amd.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20250710062313.3226149-2-guoqing.zhang@amd.com


Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
parent bead8800

drivers/gpu/drm/ttm/ttm_device.c

+22 −0
Original line number Diff line number Diff line
@@ -125,6 +125,28 @@ static int ttm_global_init(void) 
	return ret;

}



/**

 * ttm_device_prepare_hibernation - move GTT BOs to shmem for hibernation.

 *

 * @bdev: A pointer to a struct ttm_device to prepare hibernation for.

 *

 * Return: 0 on success, negative number on failure.

 */

int ttm_device_prepare_hibernation(struct ttm_device *bdev)

{

	struct ttm_operation_ctx ctx = {

		.interruptible = false,

		.no_wait_gpu = false,

	};

	int ret;



	do {

		ret = ttm_device_swapout(bdev, &ctx, GFP_KERNEL);

	} while (ret > 0);

	return ret;

}

EXPORT_SYMBOL(ttm_device_prepare_hibernation);



/*

 * A buffer object shrink method that tries to swap out the first

 * buffer object on the global::swap_lru list.

include/drm/ttm/ttm_device.h

+1 −0
Original line number Diff line number Diff line
@@ -272,6 +272,7 @@ struct ttm_device { 
int ttm_global_swapout(struct ttm_operation_ctx *ctx, gfp_t gfp_flags);

int ttm_device_swapout(struct ttm_device *bdev, struct ttm_operation_ctx *ctx,

		       gfp_t gfp_flags);

int ttm_device_prepare_hibernation(struct ttm_device *bdev);



static inline struct ttm_resource_manager *

ttm_manager_type(struct ttm_device *bdev, int mem_type)