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[FreeBSD/releng/10.2.git] / sys / dev / drm2 / ttm / ttm_bo_manager.c
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 <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <dev/drm2/drmP.h>
35 #include <dev/drm2/ttm/ttm_module.h>
36 #include <dev/drm2/ttm/ttm_bo_driver.h>
37 #include <dev/drm2/ttm/ttm_placement.h>
38 #include <dev/drm2/drm_mm.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         struct mtx lock;
49 };
50
51 MALLOC_DEFINE(M_TTM_RMAN, "ttm_rman", "TTM Range Manager");
52
53 static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
54                                struct ttm_buffer_object *bo,
55                                struct ttm_placement *placement,
56                                struct ttm_mem_reg *mem)
57 {
58         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
59         struct drm_mm *mm = &rman->mm;
60         struct drm_mm_node *node = NULL;
61         unsigned long lpfn;
62         int ret;
63
64         lpfn = placement->lpfn;
65         if (!lpfn)
66                 lpfn = man->size;
67         do {
68                 ret = drm_mm_pre_get(mm);
69                 if (unlikely(ret))
70                         return ret;
71
72                 mtx_lock(&rman->lock);
73                 node = drm_mm_search_free_in_range(mm,
74                                         mem->num_pages, mem->page_alignment,
75                                         placement->fpfn, lpfn, 1);
76                 if (unlikely(node == NULL)) {
77                         mtx_unlock(&rman->lock);
78                         return 0;
79                 }
80                 node = drm_mm_get_block_atomic_range(node, mem->num_pages,
81                                                      mem->page_alignment,
82                                                      placement->fpfn,
83                                                      lpfn);
84                 mtx_unlock(&rman->lock);
85         } while (node == NULL);
86
87         mem->mm_node = node;
88         mem->start = node->start;
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                 mtx_lock(&rman->lock);
99                 drm_mm_put_block(mem->mm_node);
100                 mtx_unlock(&rman->lock);
101                 mem->mm_node = NULL;
102         }
103 }
104
105 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
106                            unsigned long p_size)
107 {
108         struct ttm_range_manager *rman;
109         int ret;
110
111         rman = malloc(sizeof(*rman), M_TTM_RMAN, M_ZERO | M_WAITOK);
112         ret = drm_mm_init(&rman->mm, 0, p_size);
113         if (ret) {
114                 free(rman, M_TTM_RMAN);
115                 return ret;
116         }
117
118         mtx_init(&rman->lock, "ttmrman", NULL, MTX_DEF);
119         man->priv = rman;
120         return 0;
121 }
122
123 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
124 {
125         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
126         struct drm_mm *mm = &rman->mm;
127
128         mtx_lock(&rman->lock);
129         if (drm_mm_clean(mm)) {
130                 drm_mm_takedown(mm);
131                 mtx_unlock(&rman->lock);
132                 mtx_destroy(&rman->lock);
133                 free(rman, M_TTM_RMAN);
134                 man->priv = NULL;
135                 return 0;
136         }
137         mtx_unlock(&rman->lock);
138         return -EBUSY;
139 }
140
141 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
142                              const char *prefix)
143 {
144         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
145
146         mtx_lock(&rman->lock);
147         drm_mm_debug_table(&rman->mm, prefix);
148         mtx_unlock(&rman->lock);
149 }
150
151 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
152         ttm_bo_man_init,
153         ttm_bo_man_takedown,
154         ttm_bo_man_get_node,
155         ttm_bo_man_put_node,
156         ttm_bo_man_debug
157 };