ttm_memory.h

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/**************************************************************************
 *
 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
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 * copy of this software and associated documentation files (the
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 * 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.
 *
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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>

struct ttm_mem_shrink {
    int (*do_shrink) (struct ttm_mem_shrink *);
};

#define TTM_MEM_MAX_ZONES 2
struct ttm_mem_zone;
struct ttm_mem_global {
    struct kobject kobj;
    struct ttm_mem_shrink *shrink;
    struct workqueue_struct *swap_queue;
    struct work_struct work;
    wait_queue_head_t queue;
    spinlock_t lock;
    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
};

static inline void ttm_mem_init_shrink(struct ttm_mem_shrink *shrink,
                       int (*func) (struct ttm_mem_shrink *))
{
    shrink->do_shrink = func;
}

static inline int ttm_mem_register_shrink(struct ttm_mem_global *glob,
                      struct ttm_mem_shrink *shrink)
{
    spin_lock(&glob->lock);
    if (glob->shrink != NULL) {
        spin_unlock(&glob->lock);
        return -EBUSY;
    }
    glob->shrink = shrink;
    spin_unlock(&glob->lock);
    return 0;
}

static inline void ttm_mem_unregister_shrink(struct ttm_mem_global *glob,
                         struct ttm_mem_shrink *shrink)
{
    spin_lock(&glob->lock);
    BUG_ON(glob->shrink != shrink);
    glob->shrink = NULL;
    spin_unlock(&glob->lock);
}

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,
                bool no_wait, bool interruptible);
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,
                     bool no_wait, bool interruptible);
extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
                     struct page *page);
extern size_t ttm_round_pot(size_t size);
#endif