1 /**************************************************************************
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
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>
40 * struct ttm_mem_shrink - callback to shrink TTM memory usage.
42 * @do_shrink: The callback function.
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().
49 struct ttm_mem_shrink
{
50 int (*do_shrink
) (struct ttm_mem_shrink
*);
54 * struct ttm_mem_global - Global memory accounting structure.
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.
72 * Note that this structure is not per device. It should be global for all
76 #define TTM_MEM_MAX_ZONES 2
78 struct ttm_mem_global
{
80 struct ttm_mem_shrink
*shrink
;
81 struct workqueue_struct
*swap_queue
;
82 struct work_struct work
;
83 wait_queue_head_t queue
;
85 struct ttm_mem_zone
*zones
[TTM_MEM_MAX_ZONES
];
86 unsigned int num_zones
;
87 struct ttm_mem_zone
*zone_kernel
;
89 struct ttm_mem_zone
*zone_highmem
;
91 struct ttm_mem_zone
*zone_dma32
;
96 * ttm_mem_init_shrink - initialize a struct ttm_mem_shrink object
98 * @shrink: The object to initialize.
99 * @func: The callback function.
102 static inline void ttm_mem_init_shrink(struct ttm_mem_shrink
*shrink
,
103 int (*func
) (struct ttm_mem_shrink
*))
105 shrink
->do_shrink
= func
;
109 * ttm_mem_register_shrink - register a struct ttm_mem_shrink object.
111 * @glob: The struct ttm_mem_global object to register with.
112 * @shrink: An initialized struct ttm_mem_shrink object to register.
115 * -EBUSY: There's already a callback registered. (May change).
118 static inline int ttm_mem_register_shrink(struct ttm_mem_global
*glob
,
119 struct ttm_mem_shrink
*shrink
)
121 spin_lock(&glob
->lock
);
122 if (glob
->shrink
!= NULL
) {
123 spin_unlock(&glob
->lock
);
126 glob
->shrink
= shrink
;
127 spin_unlock(&glob
->lock
);
132 * ttm_mem_unregister_shrink - unregister a struct ttm_mem_shrink object.
134 * @glob: The struct ttm_mem_global object to unregister from.
135 * @shrink: A previously registert struct ttm_mem_shrink object.
139 static inline void ttm_mem_unregister_shrink(struct ttm_mem_global
*glob
,
140 struct ttm_mem_shrink
*shrink
)
142 spin_lock(&glob
->lock
);
143 BUG_ON(glob
->shrink
!= shrink
);
145 spin_unlock(&glob
->lock
);
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
,
154 extern int ttm_mem_global_alloc_page(struct ttm_mem_global
*glob
,
156 bool no_wait
, bool interruptible
);
157 extern void ttm_mem_global_free_page(struct ttm_mem_global
*glob
,
159 extern size_t ttm_round_pot(size_t size
);
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