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1 | /************************************************************************** |
2 | * | |
3 | * Copyright (c) 2007-2009 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 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> | |
29 | */ | |
30 | ||
31 | #include "ttm/ttm_module.h" | |
32 | #include "ttm/ttm_bo_driver.h" | |
33 | #include "ttm/ttm_placement.h" | |
34 | #include <linux/jiffies.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/sched.h> | |
37 | #include <linux/mm.h> | |
38 | #include <linux/file.h> | |
39 | #include <linux/module.h> | |
40 | ||
41 | static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man, | |
42 | struct ttm_buffer_object *bo, | |
43 | struct ttm_placement *placement, | |
44 | struct ttm_mem_reg *mem) | |
45 | { | |
46 | struct ttm_bo_global *glob = man->bdev->glob; | |
47 | struct drm_mm *mm = man->priv; | |
48 | struct drm_mm_node *node = NULL; | |
49 | unsigned long lpfn; | |
50 | int ret; | |
51 | ||
52 | lpfn = placement->lpfn; | |
53 | if (!lpfn) | |
54 | lpfn = man->size; | |
55 | do { | |
56 | ret = drm_mm_pre_get(mm); | |
57 | if (unlikely(ret)) | |
58 | return ret; | |
59 | ||
60 | spin_lock(&glob->lru_lock); | |
61 | node = drm_mm_search_free_in_range(mm, | |
62 | mem->num_pages, mem->page_alignment, | |
63 | placement->fpfn, lpfn, 1); | |
64 | if (unlikely(node == NULL)) { | |
65 | spin_unlock(&glob->lru_lock); | |
66 | return 0; | |
67 | } | |
68 | node = drm_mm_get_block_atomic_range(node, mem->num_pages, | |
69 | mem->page_alignment, | |
70 | placement->fpfn, | |
71 | lpfn); | |
72 | spin_unlock(&glob->lru_lock); | |
73 | } while (node == NULL); | |
74 | ||
75 | mem->mm_node = node; | |
76 | mem->start = node->start; | |
77 | return 0; | |
78 | } | |
79 | ||
80 | static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man, | |
81 | struct ttm_mem_reg *mem) | |
82 | { | |
83 | struct ttm_bo_global *glob = man->bdev->glob; | |
84 | ||
85 | if (mem->mm_node) { | |
86 | spin_lock(&glob->lru_lock); | |
87 | drm_mm_put_block(mem->mm_node); | |
88 | spin_unlock(&glob->lru_lock); | |
89 | mem->mm_node = NULL; | |
90 | } | |
91 | } | |
92 | ||
93 | static int ttm_bo_man_init(struct ttm_mem_type_manager *man, | |
94 | unsigned long p_size) | |
95 | { | |
96 | struct drm_mm *mm; | |
97 | int ret; | |
98 | ||
99 | mm = kzalloc(sizeof(*mm), GFP_KERNEL); | |
100 | if (!mm) | |
101 | return -ENOMEM; | |
102 | ||
103 | ret = drm_mm_init(mm, 0, p_size); | |
104 | if (ret) { | |
105 | kfree(mm); | |
106 | return ret; | |
107 | } | |
108 | ||
109 | man->priv = mm; | |
110 | return 0; | |
111 | } | |
112 | ||
113 | static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man) | |
114 | { | |
115 | struct ttm_bo_global *glob = man->bdev->glob; | |
116 | struct drm_mm *mm = man->priv; | |
117 | int ret = 0; | |
118 | ||
119 | spin_lock(&glob->lru_lock); | |
120 | if (drm_mm_clean(mm)) { | |
121 | drm_mm_takedown(mm); | |
122 | kfree(mm); | |
123 | man->priv = NULL; | |
124 | } else | |
125 | ret = -EBUSY; | |
126 | spin_unlock(&glob->lru_lock); | |
127 | return ret; | |
128 | } | |
129 | ||
130 | static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, | |
131 | const char *prefix) | |
132 | { | |
133 | struct ttm_bo_global *glob = man->bdev->glob; | |
134 | struct drm_mm *mm = man->priv; | |
135 | ||
136 | spin_lock(&glob->lru_lock); | |
137 | drm_mm_debug_table(mm, prefix); | |
138 | spin_unlock(&glob->lru_lock); | |
139 | } | |
140 | ||
141 | const struct ttm_mem_type_manager_func ttm_bo_manager_func = { | |
142 | ttm_bo_man_init, | |
143 | ttm_bo_man_takedown, | |
144 | ttm_bo_man_get_node, | |
145 | ttm_bo_man_put_node, | |
146 | ttm_bo_man_debug | |
147 | }; | |
148 | EXPORT_SYMBOL(ttm_bo_manager_func); |