include/drm/ttm/ttm_memory.h

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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
  65 struct ttm_mem_zone;
  66 extern struct ttm_mem_global {
  67         struct kobject kobj;
  68         struct ttm_bo_global *bo_glob;
  69         struct workqueue_struct *swap_queue;
  70         struct work_struct work;
  71         spinlock_t lock;
  72         uint64_t lower_mem_limit;
  73         struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
  74         unsigned int num_zones;
  75         struct ttm_mem_zone *zone_kernel;
  76 #ifdef CONFIG_HIGHMEM
  77         struct ttm_mem_zone *zone_highmem;
  78 #else
  79         struct ttm_mem_zone *zone_dma32;
  80 #endif
  81 } ttm_mem_glob;
  82
  83 extern int ttm_mem_global_init(struct ttm_mem_global *glob);
  84 extern void ttm_mem_global_release(struct ttm_mem_global *glob);
  85 extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
  86                                 struct ttm_operation_ctx *ctx);
  87 extern void ttm_mem_global_free(struct ttm_mem_global *glob,
  88                                 uint64_t amount);
  89 extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
  90                                      struct page *page, uint64_t size,
  91                                      struct ttm_operation_ctx *ctx);
  92 extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
  93                                      struct page *page, uint64_t size);
  94 extern size_t ttm_round_pot(size_t size);
  95 extern uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob);
  96 extern bool ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
  97                         uint64_t num_pages, struct ttm_operation_ctx *ctx);
  98 #endif