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/**************************************************************************
*
* 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
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*
* The above copyright notice and this permission notice (including the
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* of the Software.
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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 ttm_bo_global *bo_glob;
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
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