LXR linux/include/drm/ttm/ttm

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   3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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  27
  28#ifndef TTM_MEMORY_H
  29#define TTM_MEMORY_H
  30
  31#include <linux/workqueue.h>
  32#include <linux/spinlock.h>
  33#include <linux/bug.h>
  34#include <linux/wait.h>
  35#include <linux/errno.h>
  36#include <linux/kobject.h>
  37#include <linux/mm.h>
  38#include "ttm_bo_api.h"
  39
  40/**
  41 * struct ttm_mem_global - Global memory accounting structure.
  42 *
  43 * @shrink: A single callback to shrink TTM memory usage. Extend this
  44 * to a linked list to be able to handle multiple callbacks when needed.
  45 * @swap_queue: A workqueue to handle shrinking in low memory situations. We
  46 * need a separate workqueue since it will spend a lot of time waiting
  47 * for the GPU, and this will otherwise block other workqueue tasks(?)
  48 * At this point we use only a single-threaded workqueue.
  49 * @work: The workqueue callback for the shrink queue.
  50 * @lock: Lock to protect the @shrink - and the memory accounting members,
  51 * that is, essentially the whole structure with some exceptions.
  52 * @lower_mem_limit: include lower limit of swap space and lower limit of
  53 * system memory.
  54 * @zones: Array of pointers to accounting zones.
  55 * @num_zones: Number of populated entries in the @zones array.
  56 * @zone_kernel: Pointer to the kernel zone.
  57 * @zone_highmem: Pointer to the highmem zone if there is one.
  58 * @zone_dma32: Pointer to the dma32 zone if there is one.
  59 *
  60 * Note that this structure is not per device. It should be global for all
  61 * graphics devices.
  62 */
  63
  64#define TTM_MEM_MAX_ZONES 2
  65struct ttm_mem_zone;
  66extern struct ttm_mem_global {
  67        struct kobject kobj;
  68        struct workqueue_struct *swap_queue;
  69        struct work_struct work;
  70        spinlock_t lock;
  71        uint64_t lower_mem_limit;
  72        struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
  73        unsigned int num_zones;
  74        struct ttm_mem_zone *zone_kernel;
  75#ifdef CONFIG_HIGHMEM
  76        struct ttm_mem_zone *zone_highmem;
  77#else
  78        struct ttm_mem_zone *zone_dma32;
  79#endif
  80} ttm_mem_glob;
  81
  82extern int ttm_mem_global_init(struct ttm_mem_global *glob);
  83extern void ttm_mem_global_release(struct ttm_mem_global *glob);
  84extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
  85                                struct ttm_operation_ctx *ctx);
  86extern void ttm_mem_global_free(struct ttm_mem_global *glob,
  87                                uint64_t amount);
  88extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
  89                                     struct page *page, uint64_t size,
  90                                     struct ttm_operation_ctx *ctx);
  91extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
  92                                     struct page *page, uint64_t size);
  93extern size_t ttm_round_pot(size_t size);
  94extern uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob);
  95extern bool ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
  96                        uint64_t num_pages, struct ttm_operation_ctx *ctx);
  97#endif
  98