Merge branch 'vendor/OPENSSL'
[dragonfly.git] / sys / dev / drm / ttm / ttm_bo_manager.c
1 /**************************************************************************
2  *
3  * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
4  * All Rights Reserved.
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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
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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,
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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  * $FreeBSD: head/sys/dev/drm2/ttm/ttm_bo_manager.c 247835 2013-03-05 09:49:34Z kib $
31  */
32
33 #include <drm/ttm/ttm_module.h>
34 #include <drm/ttm/ttm_bo_driver.h>
35 #include <drm/ttm/ttm_placement.h>
36 #include <drm/drm_mm.h>
37 #include <linux/export.h>
38
39 /**
40  * Currently we use a spinlock for the lock, but a mutex *may* be
41  * more appropriate to reduce scheduling latency if the range manager
42  * ends up with very fragmented allocation patterns.
43  */
44
45 struct ttm_range_manager {
46         struct drm_mm mm;
47         struct lock lock;
48 };
49
50 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
51                                struct ttm_buffer_object *bo,
52                                const struct ttm_place *place,
53                                struct ttm_mem_reg *mem)
54 {
55         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
56         struct drm_mm *mm = &rman->mm;
57         struct drm_mm_node *node = NULL;
58         enum drm_mm_allocator_flags aflags = DRM_MM_CREATE_DEFAULT;
59         unsigned long lpfn;
60         int ret;
61
62         lpfn = place->lpfn;
63         if (!lpfn)
64                 lpfn = man->size;
65
66         node = kzalloc(sizeof(*node), GFP_KERNEL);
67         if (!node)
68                 return -ENOMEM;
69
70         if (place->flags & TTM_PL_FLAG_TOPDOWN)
71                 aflags = DRM_MM_CREATE_TOP;
72
73         lockmgr(&rman->lock, LK_EXCLUSIVE);
74         ret = drm_mm_insert_node_in_range_generic(mm, node, mem->num_pages,
75                                           mem->page_alignment, 0,
76                                           place->fpfn, lpfn,
77                                           DRM_MM_SEARCH_BEST,
78                                           aflags);
79         lockmgr(&rman->lock, LK_RELEASE);
80
81         if (unlikely(ret)) {
82                 kfree(node);
83         } else {
84                 mem->mm_node = node;
85                 mem->start = node->start;
86         }
87
88         return 0;
89 }
90
91 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
92                                 struct ttm_mem_reg *mem)
93 {
94         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
95
96         if (mem->mm_node) {
97                 lockmgr(&rman->lock, LK_EXCLUSIVE);
98                 drm_mm_remove_node(mem->mm_node);
99                 lockmgr(&rman->lock, LK_RELEASE);
100
101                 kfree(mem->mm_node);
102                 mem->mm_node = NULL;
103         }
104 }
105
106 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
107                            unsigned long p_size)
108 {
109         struct ttm_range_manager *rman;
110
111         rman = kmalloc(sizeof(*rman), M_DRM, M_ZERO | M_WAITOK);
112         if (!rman)
113                 return -ENOMEM;
114
115         drm_mm_init(&rman->mm, 0, p_size);
116
117         lockinit(&rman->lock, "ttmrman", 0, LK_CANRECURSE);
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         lockmgr(&rman->lock, LK_EXCLUSIVE);
128         if (drm_mm_clean(mm)) {
129                 drm_mm_takedown(mm);
130                 lockmgr(&rman->lock, LK_RELEASE);
131                 kfree(rman);
132                 man->priv = NULL;
133                 return 0;
134         }
135         lockmgr(&rman->lock, LK_RELEASE);
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         lockmgr(&rman->lock, LK_EXCLUSIVE);
145         drm_mm_debug_table(&rman->mm, prefix);
146         lockmgr(&rman->lock, LK_RELEASE);
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);