1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/* $OpenBSD: ttm_memory.h,v 1.3 2015/02/10 10:50:49 jsg Exp $ */
/**************************************************************************
*
* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#ifndef TTM_MEMORY_H
#define TTM_MEMORY_H
#include <sys/task.h>
/**
* struct ttm_mem_shrink - callback to shrink TTM memory usage.
*
* @do_shrink: The callback function.
*
* Arguments to the do_shrink functions are intended to be passed using
* inheritance. That is, the argument class derives from struct ttm_mem_shrink,
* and can be accessed using container_of().
*/
struct ttm_mem_shrink {
int (*do_shrink) (struct ttm_mem_shrink *);
};
/**
* struct ttm_mem_global - Global memory accounting structure.
*
* @shrink: A single callback to shrink TTM memory usage. Extend this
* to a linked list to be able to handle multiple callbacks when needed.
* @swap_queue: A workqueue to handle shrinking in low memory situations. We
* need a separate workqueue since it will spend a lot of time waiting
* for the GPU, and this will otherwise block other workqueue tasks(?)
* At this point we use only a single-threaded workqueue.
* @work: The workqueue callback for the shrink queue.
* @lock: Lock to protect the @shrink - and the memory accounting members,
* that is, essentially the whole structure with some exceptions.
* @zones: Array of pointers to accounting zones.
* @num_zones: Number of populated entries in the @zones array.
* @zone_kernel: Pointer to the kernel zone.
* @zone_highmem: Pointer to the highmem zone if there is one.
* @zone_dma32: Pointer to the dma32 zone if there is one.
*
* Note that this structure is not per device. It should be global for all
* graphics devices.
*/
#define TTM_MEM_MAX_ZONES 2
struct ttm_mem_zone;
struct ttm_mem_global {
u_int kobj_ref;
struct ttm_mem_shrink *shrink;
struct taskq *swap_queue;
struct task task;
bool task_queued;
struct mutex lock;
struct ttm_mem_zone *zones[TTM_MEM_MAX_ZONES];
unsigned int num_zones;
struct ttm_mem_zone *zone_kernel;
#ifdef CONFIG_HIGHMEM
struct ttm_mem_zone *zone_highmem;
#else
struct ttm_mem_zone *zone_dma32;
#endif
};
/**
* ttm_mem_init_shrink - initialize a struct ttm_mem_shrink object
*
* @shrink: The object to initialize.
* @func: The callback function.
*/
static inline void ttm_mem_init_shrink(struct ttm_mem_shrink *shrink,
int (*func) (struct ttm_mem_shrink *))
{
shrink->do_shrink = func;
}
/**
* ttm_mem_register_shrink - register a struct ttm_mem_shrink object.
*
* @glob: The struct ttm_mem_global object to register with.
* @shrink: An initialized struct ttm_mem_shrink object to register.
*
* Returns:
* -EBUSY: There's already a callback registered. (May change).
*/
static inline int ttm_mem_register_shrink(struct ttm_mem_global *glob,
struct ttm_mem_shrink *shrink)
{
spin_lock(&glob->lock);
if (glob->shrink != NULL) {
spin_unlock(&glob->lock);
return -EBUSY;
}
glob->shrink = shrink;
spin_unlock(&glob->lock);
return 0;
}
/**
* ttm_mem_unregister_shrink - unregister a struct ttm_mem_shrink object.
*
* @glob: The struct ttm_mem_global object to unregister from.
* @shrink: A previously registert struct ttm_mem_shrink object.
*
*/
static inline void ttm_mem_unregister_shrink(struct ttm_mem_global *glob,
struct ttm_mem_shrink *shrink)
{
spin_lock(&glob->lock);
BUG_ON(glob->shrink != shrink);
glob->shrink = NULL;
spin_unlock(&glob->lock);
}
extern int ttm_mem_global_init(struct ttm_mem_global *glob);
extern void ttm_mem_global_release(struct ttm_mem_global *glob);
extern int ttm_mem_global_alloc(struct ttm_mem_global *glob, uint64_t memory,
bool no_wait, bool interruptible);
extern void ttm_mem_global_free(struct ttm_mem_global *glob,
uint64_t amount);
extern int ttm_mem_global_alloc_page(struct ttm_mem_global *glob,
struct vm_page *page,
bool no_wait, bool interruptible);
extern void ttm_mem_global_free_page(struct ttm_mem_global *glob,
struct vm_page *page);
extern size_t ttm_round_pot(size_t size);
#endif
|
