include/drm/ttm/ttm_memory.h

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