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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 #include <drm/ttm/ttm_bo_api.h>
40 
41 /**
42  * struct ttm_mem_global - Global memory accounting structure.
43  *
44  * @shrink: A single callback to shrink TTM memory usage. Extend this
45  * to a linked list to be able to handle multiple callbacks when needed.
46  * @swap_queue: A workqueue to handle shrinking in low memory situations. We
47  * need a separate workqueue since it will spend a lot of time waiting
48  * for the GPU, and this will otherwise block other workqueue tasks(?)
49  * At this point we use only a single-threaded workqueue.
50  * @work: The workqueue callback for the shrink queue.
51  * @lock: Lock to protect the @shrink - and the memory accounting members,
52  * that is, essentially the whole structure with some exceptions.
53  * @lower_mem_limit: include lower limit of swap space and lower limit of
54  * system memory.
55  * @zones: Array of pointers to accounting zones.
56  * @num_zones: Number of populated entries in the @zones array.
57  * @zone_kernel: Pointer to the kernel zone.
58  * @zone_highmem: Pointer to the highmem zone if there is one.
59  * @zone_dma32: Pointer to the dma32 zone if there is one.
60  *
61  * Note that this structure is not per device. It should be global for all
62  * graphics devices.
63  */
64 
65 #define TTM_MEM_MAX_ZONES 2
66 struct ttm_mem_zone;
67 extern struct ttm_mem_global {
68 	struct kobject kobj;
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 int ttm_mem_global_init(struct ttm_mem_global *glob, struct device *dev);
84 void ttm_mem_global_release(struct ttm_mem_global *glob);
85 int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
86 			 struct ttm_operation_ctx *ctx);
87 void ttm_mem_global_free(struct ttm_mem_global *glob, uint64_t amount);
88 int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
89 			      struct page *page, uint64_t size,
90 			      struct ttm_operation_ctx *ctx);
91 void ttm_mem_global_free_page(struct ttm_mem_global *glob,
92 			      struct page *page, uint64_t size);
93 size_t ttm_round_pot(size_t size);
94 bool ttm_check_under_lowerlimit(struct ttm_mem_global *glob, uint64_t num_pages,
95 				struct ttm_operation_ctx *ctx);
96 #endif
97