On 04.07.25 12:12, Samuel Zhang wrote:
> 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: Samuel Zhang <guoqing.zh...@amd.com>
> ---
> drivers/gpu/drm/ttm/ttm_device.c | 29 +++++++++++++++++++++++++++++
> include/drm/ttm/ttm_device.h | 1 +
> 2 files changed, 30 insertions(+)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_device.c
> b/drivers/gpu/drm/ttm/ttm_device.c
> index 02e797fd1891..19ab35ffeead 100644
> --- a/drivers/gpu/drm/ttm/ttm_device.c
> +++ b/drivers/gpu/drm/ttm/ttm_device.c
> @@ -123,6 +123,35 @@ static int ttm_global_init(void)
> return ret;
> }
>
> +/**
> + * move GTT BOs to shmem for hibernation.
> + *
> + * returns 0 on success, negative on failure.
> + */
> +int ttm_device_prepare_hibernation(void)
This needs the device as argument.
> +{
> + struct ttm_operation_ctx ctx = {
> + .interruptible = false,
> + .no_wait_gpu = false,
> + .force_alloc = true
> + };
> + struct ttm_global *glob = &ttm_glob;
> + struct ttm_device *bdev;
> + int ret = 0;
> +
> + mutex_lock(&ttm_global_mutex);
> + list_for_each_entry(bdev, &glob->device_list, device_list) {
> + do {
> + ret = ttm_device_swapout(bdev, &ctx, GFP_KERNEL);
> + } while (ret > 0);
> + if (ret < 0)
> + break;
> + }
In other words call ttm_device_swapout() in a loop for a specific device and
not for all devices.
Regards,
Christian.
> + mutex_unlock(&ttm_global_mutex);
> + 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.
> diff --git a/include/drm/ttm/ttm_device.h b/include/drm/ttm/ttm_device.h
> index 39b8636b1845..b45498b398dd 100644
> --- a/include/drm/ttm/ttm_device.h
> +++ b/include/drm/ttm/ttm_device.h
> @@ -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(void);
>
> static inline struct ttm_resource_manager *
> ttm_manager_type(struct ttm_device *bdev, int mem_type)
