drm/vmwgfx: Treat out-of-range initial width and height as host errors
[linux-2.6.git] / drivers / gpu / drm / vmwgfx / vmwgfx_gmrid_manager.c
1 /**************************************************************************
2  *
3  * Copyright (c) 2007-2010 VMware, Inc., Palo Alto, CA., USA
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15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
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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
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26  **************************************************************************/
27 /*
28  * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29  */
30
31 #include "vmwgfx_drv.h"
32 #include "ttm/ttm_module.h"
33 #include "ttm/ttm_bo_driver.h"
34 #include "ttm/ttm_placement.h"
35 #include <linux/idr.h>
36 #include <linux/spinlock.h>
37 #include <linux/kernel.h>
38
39 struct vmwgfx_gmrid_man {
40         spinlock_t lock;
41         struct ida gmr_ida;
42         uint32_t max_gmr_ids;
43         uint32_t max_gmr_pages;
44         uint32_t used_gmr_pages;
45 };
46
47 static int vmw_gmrid_man_get_node(struct ttm_mem_type_manager *man,
48                                   struct ttm_buffer_object *bo,
49                                   struct ttm_placement *placement,
50                                   struct ttm_mem_reg *mem)
51 {
52         struct vmwgfx_gmrid_man *gman =
53                 (struct vmwgfx_gmrid_man *)man->priv;
54         int ret = 0;
55         int id;
56
57         mem->mm_node = NULL;
58
59         spin_lock(&gman->lock);
60
61         if (gman->max_gmr_pages > 0) {
62                 gman->used_gmr_pages += bo->num_pages;
63                 if (unlikely(gman->used_gmr_pages > gman->max_gmr_pages))
64                         goto out_err_locked;
65         }
66
67         do {
68                 spin_unlock(&gman->lock);
69                 if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0)) {
70                         ret = -ENOMEM;
71                         goto out_err;
72                 }
73                 spin_lock(&gman->lock);
74
75                 ret = ida_get_new(&gman->gmr_ida, &id);
76                 if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
77                         ida_remove(&gman->gmr_ida, id);
78                         ret = 0;
79                         goto out_err_locked;
80                 }
81         } while (ret == -EAGAIN);
82
83         if (likely(ret == 0)) {
84                 mem->mm_node = gman;
85                 mem->start = id;
86                 mem->num_pages = bo->num_pages;
87         } else
88                 goto out_err_locked;
89
90         spin_unlock(&gman->lock);
91         return 0;
92
93 out_err:
94         spin_lock(&gman->lock);
95 out_err_locked:
96         gman->used_gmr_pages -= bo->num_pages;
97         spin_unlock(&gman->lock);
98         return ret;
99 }
100
101 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
102                                    struct ttm_mem_reg *mem)
103 {
104         struct vmwgfx_gmrid_man *gman =
105                 (struct vmwgfx_gmrid_man *)man->priv;
106
107         if (mem->mm_node) {
108                 spin_lock(&gman->lock);
109                 ida_remove(&gman->gmr_ida, mem->start);
110                 gman->used_gmr_pages -= mem->num_pages;
111                 spin_unlock(&gman->lock);
112                 mem->mm_node = NULL;
113         }
114 }
115
116 static int vmw_gmrid_man_init(struct ttm_mem_type_manager *man,
117                               unsigned long p_size)
118 {
119         struct vmw_private *dev_priv =
120                 container_of(man->bdev, struct vmw_private, bdev);
121         struct vmwgfx_gmrid_man *gman =
122                 kzalloc(sizeof(*gman), GFP_KERNEL);
123
124         if (unlikely(gman == NULL))
125                 return -ENOMEM;
126
127         spin_lock_init(&gman->lock);
128         gman->max_gmr_pages = dev_priv->max_gmr_pages;
129         gman->used_gmr_pages = 0;
130         ida_init(&gman->gmr_ida);
131         gman->max_gmr_ids = p_size;
132         man->priv = (void *) gman;
133         return 0;
134 }
135
136 static int vmw_gmrid_man_takedown(struct ttm_mem_type_manager *man)
137 {
138         struct vmwgfx_gmrid_man *gman =
139                 (struct vmwgfx_gmrid_man *)man->priv;
140
141         if (gman) {
142                 ida_destroy(&gman->gmr_ida);
143                 kfree(gman);
144         }
145         return 0;
146 }
147
148 static void vmw_gmrid_man_debug(struct ttm_mem_type_manager *man,
149                                 const char *prefix)
150 {
151         printk(KERN_INFO "%s: No debug info available for the GMR "
152                "id manager.\n", prefix);
153 }
154
155 const struct ttm_mem_type_manager_func vmw_gmrid_manager_func = {
156         vmw_gmrid_man_init,
157         vmw_gmrid_man_takedown,
158         vmw_gmrid_man_get_node,
159         vmw_gmrid_man_put_node,
160         vmw_gmrid_man_debug
161 };