include/drm/ttm/ttm_memory.h

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   3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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  15  * next paragraph) shall be included in all copies or substantial portions
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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/wait.h>
  34 #include <linux/errno.h>
  35 #include <linux/kobject.h>
  36 #include <linux/mm.h>
  37
  38 /**
  39  * struct ttm_mem_shrink - callback to shrink TTM memory usage.
  40  *
  41  * @do_shrink: The callback function.
  42  *
  43  * Arguments to the do_shrink functions are intended to be passed using
  44  * inheritance. That is, the argument class derives from struct ttm_mem_shrink,
  45  * and can be accessed using container_of().
  46  */
  47
  48 struct ttm_mem_shrink {
  49         int (*do_shrink) (struct ttm_mem_shrink *);
  50 };
  51
  52 /**
  53  * struct ttm_mem_global - Global memory accounting structure.
  54  *
  55  * @shrink: A single callback to shrink TTM memory usage. Extend this
  56  * to a linked list to be able to handle multiple callbacks when needed.
  57  * @swap_queue: A workqueue to handle shrinking in low memory situations. We
  58  * need a separate workqueue since it will spend a lot of time waiting
  59  * for the GPU, and this will otherwise block other workqueue tasks(?)
  60  * At this point we use only a single-threaded workqueue.
  61  * @work: The workqueue callback for the shrink queue.
  62  * @queue: Wait queue for processes suspended waiting for memory.
  63  * @lock: Lock to protect the @shrink - and the memory accounting members,
  64  * that is, essentially the whole structure with some exceptions.
  65  * @zones: Array of pointers to accounting zones.
  66  * @num_zones: Number of populated entries in the @zones array.
  67  * @zone_kernel: Pointer to the kernel zone.
  68  * @zone_highmem: Pointer to the highmem zone if there is one.
  69  * @zone_dma32: Pointer to the dma32 zone if there is one.
  70  *
  71  * Note that this structure is not per device. It should be global for all
  72  * graphics devices.
  73  */
  74
  75 #define TTM_MEM_MAX_ZONES 2
  76 struct ttm_mem_zone;
  77 struct ttm_mem_global {
  78         struct kobject kobj;
  79         struct ttm_mem_shrink *shrink;
  80         struct workqueue_struct *swap_queue;
  81         struct work_struct work;
  82         wait_queue_head_t queue;
  83         spinlock_t lock;
  84         struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
  85         unsigned int num_zones;
  86         struct ttm_mem_zone *zone_kernel;
  87 #ifdef CONFIG_HIGHMEM
  88         struct ttm_mem_zone *zone_highmem;
  89 #else
  90         struct ttm_mem_zone *zone_dma32;
  91 #endif
  92 };
  93
  94 /**
  95  * ttm_mem_init_shrink - initialize a struct ttm_mem_shrink object
  96  *
  97  * @shrink: The object to initialize.
  98  * @func: The callback function.
  99  */
 100
 101 static inline void ttm_mem_init_shrink(struct ttm_mem_shrink *shrink,
 102                                        int (*func) (struct ttm_mem_shrink *))
 103 {
 104         shrink->do_shrink = func;
 105 }
 106
 107 /**
 108  * ttm_mem_register_shrink - register a struct ttm_mem_shrink object.
 109  *
 110  * @glob: The struct ttm_mem_global object to register with.
 111  * @shrink: An initialized struct ttm_mem_shrink object to register.
 112  *
 113  * Returns:
 114  * -EBUSY: There's already a callback registered. (May change).
 115  */
 116
 117 static inline int ttm_mem_register_shrink(struct ttm_mem_global *glob,
 118                                           struct ttm_mem_shrink *shrink)
 119 {
 120         spin_lock(&glob->lock);
 121         if (glob->shrink != NULL) {
 122                 spin_unlock(&glob->lock);
 123                 return -EBUSY;
 124         }
 125         glob->shrink = shrink;
 126         spin_unlock(&glob->lock);
 127         return 0;
 128 }
 129
 130 /**
 131  * ttm_mem_unregister_shrink - unregister a struct ttm_mem_shrink object.
 132  *
 133  * @glob: The struct ttm_mem_global object to unregister from.
 134  * @shrink: A previously registert struct ttm_mem_shrink object.
 135  *
 136  */
 137
 138 static inline void ttm_mem_unregister_shrink(struct ttm_mem_global *glob,
 139                                              struct ttm_mem_shrink *shrink)
 140 {
 141         spin_lock(&glob->lock);
 142         BUG_ON(glob->shrink != shrink);
 143         glob->shrink = NULL;
 144         spin_unlock(&glob->lock);
 145 }
 146
 147 extern int ttm_mem_global_init(struct ttm_mem_global *glob);
 148 extern void ttm_mem_global_release(struct ttm_mem_global *glob);
 149 extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
 150                                 bool no_wait, bool interruptible);
 151 extern void ttm_mem_global_free(struct ttm_mem_global *glob,
 152                                 uint64_t amount);
 153 extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
 154                                      struct page *page,
 155                                      bool no_wait, bool interruptible);
 156 extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
 157                                      struct page *page);
 158 extern size_t ttm_round_pot(size_t size);
 159 #endif