include/drm/ttm/ttm_memory.h

/**************************************************************************
 *
 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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
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 **************************************************************************/

#ifndef TTM_MEMORY_H
#define TTM_MEMORY_H

#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/bug.h>
#include <linux/wait.h>
#include <linux/errno.h>
#include <linux/kobject.h>
#include <linux/mm.h>
#include "ttm_bo_api.h"

/**
 * struct ttm_mem_global - Global memory accounting structure.
 *
 * @shrink: A single callback to shrink TTM memory usage. Extend this
 * to a linked list to be able to handle multiple callbacks when needed.
 * @swap_queue: A workqueue to handle shrinking in low memory situations. We
 * need a separate workqueue since it will spend a lot of time waiting
 * for the GPU, and this will otherwise block other workqueue tasks(?)
 * At this point we use only a single-threaded workqueue.
 * @work: The workqueue callback for the shrink queue.
 * @lock: Lock to protect the @shrink - and the memory accounting members,
 * that is, essentially the whole structure with some exceptions.
 * @lower_mem_limit: include lower limit of swap space and lower limit of
 * system memory.
 * @zones: Array of pointers to accounting zones.
 * @num_zones: Number of populated entries in the @zones array.
 * @zone_kernel: Pointer to the kernel zone.
 * @zone_highmem: Pointer to the highmem zone if there is one.
 * @zone_dma32: Pointer to the dma32 zone if there is one.
 *
 * Note that this structure is not per device. It should be global for all
 * graphics devices.
 */

#define TTM_MEM_MAX_ZONES 2
struct ttm_mem_zone;
extern struct ttm_mem_global {
	struct kobject kobj;
	struct workqueue_struct *swap_queue;
	struct work_struct work;
	spinlock_t lock;
	uint64_t lower_mem_limit;
	struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
	unsigned int num_zones;
	struct ttm_mem_zone *zone_kernel;
#ifdef CONFIG_HIGHMEM
	struct ttm_mem_zone *zone_highmem;
#else
	struct ttm_mem_zone *zone_dma32;
#endif
} ttm_mem_glob;

extern int ttm_mem_global_init(struct ttm_mem_global *glob);
extern void ttm_mem_global_release(struct ttm_mem_global *glob);
extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
				struct ttm_operation_ctx *ctx);
extern void ttm_mem_global_free(struct ttm_mem_global *glob,
				uint64_t amount);
extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
				     struct page *page, uint64_t size,
				     struct ttm_operation_ctx *ctx);
extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
				     struct page *page, uint64_t size);
extern size_t ttm_round_pot(size_t size);
extern uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob);
extern bool ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
			uint64_t num_pages, struct ttm_operation_ctx *ctx);
#endif