linux/drivers/gpu/drm/i915/gem/i915_gem_ttm_pm.c

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2021 Intel Corporation
 */

#include <drm/ttm/ttm_placement.h>
#include <drm/ttm/ttm_tt.h>

#include "i915_drv.h"
#include "intel_memory_region.h"
#include "intel_region_ttm.h"

#include "gem/i915_gem_region.h"
#include "gem/i915_gem_ttm.h"
#include "gem/i915_gem_ttm_move.h"
#include "gem/i915_gem_ttm_pm.h"

/**
 * i915_ttm_backup_free - Free any backup attached to this object
 * @obj: The object whose backup is to be freed.
 */
void i915_ttm_backup_free(struct drm_i915_gem_object *obj)
{ … }

/**
 * struct i915_gem_ttm_pm_apply - Apply-to-region subclass for restore
 * @base: The i915_gem_apply_to_region we derive from.
 * @allow_gpu: Whether using the gpu blitter is allowed.
 * @backup_pinned: On backup, backup also pinned objects.
 */
struct i915_gem_ttm_pm_apply { … };

static int i915_ttm_backup(struct i915_gem_apply_to_region *apply,
			   struct drm_i915_gem_object *obj)
{ … }

static int i915_ttm_recover(struct i915_gem_apply_to_region *apply,
			    struct drm_i915_gem_object *obj)
{ … }

/**
 * i915_ttm_recover_region - Free the backup of all objects of a region
 * @mr: The memory region
 *
 * Checks all objects of a region if there is backup attached and if so
 * frees that backup. Typically this is called to recover after a partially
 * performed backup.
 */
void i915_ttm_recover_region(struct intel_memory_region *mr)
{ … }

/**
 * i915_ttm_backup_region - Back up all objects of a region to smem.
 * @mr: The memory region
 * @flags: TTM backup flags
 *
 * Loops over all objects of a region and either evicts them if they are
 * evictable or backs them up using a backup object if they are pinned.
 *
 * Return: Zero on success. Negative error code on error.
 */
int i915_ttm_backup_region(struct intel_memory_region *mr, u32 flags)
{ … }

static int i915_ttm_restore(struct i915_gem_apply_to_region *apply,
			    struct drm_i915_gem_object *obj)
{ … }

/**
 * i915_ttm_restore_region - Restore backed-up objects of a region from smem.
 * @mr: The memory region
 * @flags: TTM backup flags
 *
 * Loops over all objects of a region and if they are backed-up, restores
 * them from smem.
 *
 * Return: Zero on success. Negative error code on error.
 */
int i915_ttm_restore_region(struct intel_memory_region *mr, u32 flags)
{ … }