drivers/gpu/drm/i915/i915_gem_fence_reg.h

/*
 * Copyright © 2016 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 */

#ifndef __I915_FENCE_REG_H__
#define __I915_FENCE_REG_H__

#include <linux/list.h>
#include <linux/types.h>

struct drm_i915_gem_object;
struct i915_ggtt;
struct i915_vma;
struct intel_gt;
struct sg_table;

#define I965_FENCE_PAGE 4096UL

struct i915_fence_reg {
	struct list_head link;
	struct i915_ggtt *ggtt;
	struct i915_vma *vma;
	atomic_t pin_count;
	int id;
	/**
	 * Whether the tiling parameters for the currently
	 * associated fence register have changed. Note that
	 * for the purposes of tracking tiling changes we also
	 * treat the unfenced register, the register slot that
	 * the object occupies whilst it executes a fenced
	 * command (such as BLT on gen2/3), as a "fence".
	 */
	bool dirty;
};

/* i915_gem_fence_reg.c */
struct i915_fence_reg *i915_reserve_fence(struct i915_ggtt *ggtt);
void i915_unreserve_fence(struct i915_fence_reg *fence);

void i915_gem_restore_fences(struct i915_ggtt *ggtt);

void i915_gem_object_do_bit_17_swizzle(struct drm_i915_gem_object *obj,
				       struct sg_table *pages);
void i915_gem_object_save_bit_17_swizzle(struct drm_i915_gem_object *obj,
					 struct sg_table *pages);

void i915_ggtt_init_fences(struct i915_ggtt *ggtt);

void intel_gt_init_swizzling(struct intel_gt *gt);

#endif