xe_res_cursor.h | Explore in Territory

/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
/*
 * Copyright 2020 Advanced Micro Devices, Inc.
 *
 * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 _XE_RES_CURSOR_H_
#define _XE_RES_CURSOR_H_

#include <linux/scatterlist.h>

#include <drm/drm_mm.h>
#include <drm/ttm/ttm_placement.h>
#include <drm/ttm/ttm_range_manager.h>
#include <drm/ttm/ttm_resource.h>
#include <drm/ttm/ttm_tt.h>

#include "xe_bo.h"
#include "xe_device.h"
#include "xe_macros.h"
#include "xe_ttm_vram_mgr.h"

/* state back for walking over vram_mgr, stolen_mgr, and gtt_mgr allocations */
struct xe_res_cursor { … };

static struct drm_buddy *xe_res_get_buddy(struct ttm_resource *res)
{ … }

/**
 * xe_res_first - initialize a xe_res_cursor
 *
 * @res: TTM resource object to walk
 * @start: Start of the range
 * @size: Size of the range
 * @cur: cursor object to initialize
 *
 * Start walking over the range of allocations between @start and @size.
 */
static inline void xe_res_first(struct ttm_resource *res,
				u64 start, u64 size,
				struct xe_res_cursor *cur)
{ … }

static inline void __xe_res_sg_next(struct xe_res_cursor *cur)
{ … }

/**
 * xe_res_first_sg - initialize a xe_res_cursor with a scatter gather table
 *
 * @sg: scatter gather table to walk
 * @start: Start of the range
 * @size: Size of the range
 * @cur: cursor object to initialize
 *
 * Start walking over the range of allocations between @start and @size.
 */
static inline void xe_res_first_sg(const struct sg_table *sg,
				   u64 start, u64 size,
				   struct xe_res_cursor *cur)
{ … }

/**
 * xe_res_next - advance the cursor
 *
 * @cur: the cursor to advance
 * @size: number of bytes to move forward
 *
 * Move the cursor @size bytes forwrad, walking to the next node if necessary.
 */
static inline void xe_res_next(struct xe_res_cursor *cur, u64 size)
{ … }

/**
 * xe_res_dma - return dma address of cursor at current position
 *
 * @cur: the cursor to return the dma address from
 */
static inline u64 xe_res_dma(const struct xe_res_cursor *cur)
{ … }
#endif
linux/drivers/gpu/drm/xe/xe_res_cursor.h
