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TOMOYO Linux Cross Reference
Linux/include/drm/ttm/ttm_memory.h

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  1 /**************************************************************************
  2  *
  3  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
  4  * All Rights Reserved.
  5  *
  6  * Permission is hereby granted, free of charge, to any person obtaining a
  7  * copy of this software and associated documentation files (the
  8  * "Software"), to deal in the Software without restriction, including
  9  * without limitation the rights to use, copy, modify, merge, publish,
 10  * distribute, sub license, and/or sell copies of the Software, and to
 11  * permit persons to whom the Software is furnished to do so, subject to
 12  * the following conditions:
 13  *
 14  * The above copyright notice and this permission notice (including the
 15  * next paragraph) shall be included in all copies or substantial portions
 16  * of the Software.
 17  *
 18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
 25  *
 26  **************************************************************************/
 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  * @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         spinlock_t lock;
 83         struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
 84         unsigned int num_zones;
 85         struct ttm_mem_zone *zone_kernel;
 86 #ifdef CONFIG_HIGHMEM
 87         struct ttm_mem_zone *zone_highmem;
 88 #else
 89         struct ttm_mem_zone *zone_dma32;
 90 #endif
 91 };
 92 
 93 /**
 94  * ttm_mem_init_shrink - initialize a struct ttm_mem_shrink object
 95  *
 96  * @shrink: The object to initialize.
 97  * @func: The callback function.
 98  */
 99 
100 static inline void ttm_mem_init_shrink(struct ttm_mem_shrink *shrink,
101                                        int (*func) (struct ttm_mem_shrink *))
102 {
103         shrink->do_shrink = func;
104 }
105 
106 /**
107  * ttm_mem_register_shrink - register a struct ttm_mem_shrink object.
108  *
109  * @glob: The struct ttm_mem_global object to register with.
110  * @shrink: An initialized struct ttm_mem_shrink object to register.
111  *
112  * Returns:
113  * -EBUSY: There's already a callback registered. (May change).
114  */
115 
116 static inline int ttm_mem_register_shrink(struct ttm_mem_global *glob,
117                                           struct ttm_mem_shrink *shrink)
118 {
119         spin_lock(&glob->lock);
120         if (glob->shrink != NULL) {
121                 spin_unlock(&glob->lock);
122                 return -EBUSY;
123         }
124         glob->shrink = shrink;
125         spin_unlock(&glob->lock);
126         return 0;
127 }
128 
129 /**
130  * ttm_mem_unregister_shrink - unregister a struct ttm_mem_shrink object.
131  *
132  * @glob: The struct ttm_mem_global object to unregister from.
133  * @shrink: A previously registert struct ttm_mem_shrink object.
134  *
135  */
136 
137 static inline void ttm_mem_unregister_shrink(struct ttm_mem_global *glob,
138                                              struct ttm_mem_shrink *shrink)
139 {
140         spin_lock(&glob->lock);
141         BUG_ON(glob->shrink != shrink);
142         glob->shrink = NULL;
143         spin_unlock(&glob->lock);
144 }
145 
146 extern int ttm_mem_global_init(struct ttm_mem_global *glob);
147 extern void ttm_mem_global_release(struct ttm_mem_global *glob);
148 extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
149                                 bool no_wait, bool interruptible);
150 extern void ttm_mem_global_free(struct ttm_mem_global *glob,
151                                 uint64_t amount);
152 extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
153                                      struct page *page, uint64_t size);
154 extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
155                                      struct page *page, uint64_t size);
156 extern size_t ttm_round_pot(size_t size);
157 extern uint64_t ttm_get_kernel_zone_memory_size(struct ttm_mem_global *glob);
158 #endif
159 

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