drm/radeon: Partial update to Linux 3.12
[dragonfly.git] / sys / dev / drm / ttm / ttm_bo_manager.c
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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                                struct ttm_placement *placement,
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         unsigned long lpfn;
59         int ret;
60
61         lpfn = placement->lpfn;
62         if (!lpfn)
63                 lpfn = man->size;
64
65         node = kzalloc(sizeof(*node), GFP_KERNEL);
66         if (!node)
67                 return -ENOMEM;
68
69         lockmgr(&rman->lock, LK_EXCLUSIVE);
70         ret = drm_mm_insert_node_in_range(mm, node, mem->num_pages,
71                                           mem->page_alignment,
72                                           placement->fpfn, lpfn,
73                                           DRM_MM_SEARCH_BEST);
74         lockmgr(&rman->lock, LK_RELEASE);
75
76         if (unlikely(ret)) {
77                 kfree(node);
78         } else {
79                 mem->mm_node = node;
80                 mem->start = node->start;
81         }
82
83         return 0;
84 }
85
86 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
87                                 struct ttm_mem_reg *mem)
88 {
89         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
90
91         if (mem->mm_node) {
92                 lockmgr(&rman->lock, LK_EXCLUSIVE);
93                 drm_mm_remove_node(mem->mm_node);
94                 lockmgr(&rman->lock, LK_RELEASE);
95
96                 kfree(mem->mm_node);
97                 mem->mm_node = NULL;
98         }
99 }
100
101 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
102                            unsigned long p_size)
103 {
104         struct ttm_range_manager *rman;
105
106         rman = kmalloc(sizeof(*rman), M_DRM, M_ZERO | M_WAITOK);
107         if (!rman)
108                 return -ENOMEM;
109
110         drm_mm_init(&rman->mm, 0, p_size);
111
112         lockinit(&rman->lock, "ttmrman", 0, LK_CANRECURSE);
113         man->priv = rman;
114         return 0;
115 }
116
117 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
118 {
119         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
120         struct drm_mm *mm = &rman->mm;
121
122         lockmgr(&rman->lock, LK_EXCLUSIVE);
123         if (drm_mm_clean(mm)) {
124                 drm_mm_takedown(mm);
125                 lockmgr(&rman->lock, LK_RELEASE);
126                 kfree(rman);
127                 man->priv = NULL;
128                 return 0;
129         }
130         lockmgr(&rman->lock, LK_RELEASE);
131         return -EBUSY;
132 }
133
134 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
135                              const char *prefix)
136 {
137         struct ttm_range_manager *rman = (struct ttm_range_manager *) man->priv;
138
139         lockmgr(&rman->lock, LK_EXCLUSIVE);
140         drm_mm_debug_table(&rman->mm, prefix);
141         lockmgr(&rman->lock, LK_RELEASE);
142 }
143
144 const struct ttm_mem_type_manager_func ttm_bo_manager_func = {
145         ttm_bo_man_init,
146         ttm_bo_man_takedown,
147         ttm_bo_man_get_node,
148         ttm_bo_man_put_node,
149         ttm_bo_man_debug
150 };
151 EXPORT_SYMBOL(ttm_bo_manager_func);