1 | /************************************************************************** |
2 | * |
3 | * Copyright (c) 2007-2010 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 <drm/ttm/ttm_module.h> |
32 | #include <drm/ttm/ttm_bo_driver.h> |
33 | #include <drm/ttm/ttm_placement.h> |
34 | #include <drm/drm_mm.h> |
35 | #include <linux/slab.h> |
36 | #include <linux/spinlock.h> |
37 | #include <linux/module.h> |
38 | #include <linux/export.h> |
39 | |
40 | /** |
41 | * Currently we use a spinlock for the lock, but a mutex *may* be |
42 | * more appropriate to reduce scheduling latency if the range manager |
43 | * ends up with very fragmented allocation patterns. |
44 | */ |
45 | |
46 | struct ttm_range_manager { |
47 | struct drm_mm mm; |
48 | spinlock_t lock; |
49 | }; |
50 | |
51 | static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man, |
52 | struct ttm_buffer_object *bo, |
53 | struct ttm_placement *placement, |
54 | struct ttm_mem_reg *mem) |
55 | { |
56 | struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; |
57 | struct drm_mm *mm = &rman->mm; |
58 | struct drm_mm_node *node = NULL; |
59 | enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT; |
60 | unsigned long lpfn; |
61 | int ret; |
62 | |
63 | lpfn = placement->lpfn; |
64 | if (!lpfn) |
65 | lpfn = man->size; |
66 | |
67 | node = kzalloc(sizeof(*node), GFP_KERNEL); |
68 | if (!node) |
69 | return -ENOMEM; |
70 | |
71 | if (bo->mem.placement & TTM_PL_FLAG_TOPDOWN) |
72 | aflags = DRM_MM_CREATE_TOP; |
73 | |
74 | spin_lock(&rman->lock); |
75 | ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages, |
76 | mem->page_alignment, 0, |
77 | placement->fpfn, lpfn, |
78 | DRM_MM_SEARCH_BEST, |
79 | aflags); |
80 | spin_unlock(&rman->lock); |
81 | |
82 | if (unlikely(ret)) { |
83 | kfree(node); |
84 | } else { |
85 | mem->mm_node = node; |
86 | mem->start = node->start; |
87 | } |
88 | |
89 | return 0; |
90 | } |
91 | |
92 | static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man, |
93 | struct ttm_mem_reg *mem) |
94 | { |
95 | struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; |
96 | |
97 | if (mem->mm_node) { |
98 | spin_lock(&rman->lock); |
99 | drm_mm_remove_node(mem->mm_node); |
100 | spin_unlock(&rman->lock); |
101 | |
102 | kfree(mem->mm_node); |
103 | mem->mm_node = NULL; |
104 | } |
105 | } |
106 | |
107 | static int ttm_bo_man_init(struct ttm_mem_type_manager *man, |
108 | unsigned long p_size) |
109 | { |
110 | struct ttm_range_manager *rman; |
111 | |
112 | rman = kzalloc(sizeof(*rman), GFP_KERNEL); |
113 | if (!rman) |
114 | return -ENOMEM; |
115 | |
116 | drm_mm_init(&rman->mm, 0, p_size); |
117 | spin_lock_init(&rman->lock); |
118 | man->priv = rman; |
119 | return 0; |
120 | } |
121 | |
122 | static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man) |
123 | { |
124 | struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; |
125 | struct drm_mm *mm = &rman->mm; |
126 | |
127 | spin_lock(&rman->lock); |
128 | if (drm_mm_clean(mm)) { |
129 | drm_mm_takedown(mm); |
130 | spin_unlock(&rman->lock); |
131 | kfree(rman); |
132 | man->priv = NULL; |
133 | return 0; |
134 | } |
135 | spin_unlock(&rman->lock); |
136 | return -EBUSY; |
137 | } |
138 | |
139 | static void ttm_bo_man_debug(struct ttm_mem_type_manager *man, |
140 | const char *prefix) |
141 | { |
142 | struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv; |
143 | |
144 | spin_lock(&rman->lock); |
145 | drm_mm_debug_table(&rman->mm, prefix); |
146 | spin_unlock(&rman->lock); |
147 | } |
148 | |
149 | const struct ttm_mem_type_manager_func ttm_bo_manager_func = { |
150 | ttm_bo_man_init, |
151 | ttm_bo_man_takedown, |
152 | ttm_bo_man_get_node, |
153 | ttm_bo_man_put_node, |
154 | ttm_bo_man_debug |
155 | }; |
156 | EXPORT_SYMBOL(ttm_bo_manager_func); |
157 | |