drm: Apply "Memory fragmentation from lost alignment blocks"
[linux-2.6] / drivers / gpu / drm / drm_drawable.c
1 /**
2  * \file drm_drawable.c
3  * IOCTLs for drawables
4  *
5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
6  * \author Gareth Hughes <gareth@valinux.com>
7  * \author Michel Dänzer <michel@tungstengraphics.com>
8  */
9
10 /*
11  * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
12  *
13  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
14  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
15  * Copyright 2006 Tungsten Graphics, Inc., Bismarck, North Dakota.
16  * All Rights Reserved.
17  *
18  * Permission is hereby granted, free of charge, to any person obtaining a
19  * copy of this software and associated documentation files (the "Software"),
20  * to deal in the Software without restriction, including without limitation
21  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
22  * and/or sell copies of the Software, and to permit persons to whom the
23  * Software is furnished to do so, subject to the following conditions:
24  *
25  * The above copyright notice and this permission notice (including the next
26  * paragraph) shall be included in all copies or substantial portions of the
27  * Software.
28  *
29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
30  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
31  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
32  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
33  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
34  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
35  * OTHER DEALINGS IN THE SOFTWARE.
36  */
37
38 #include "drmP.h"
39
40 /**
41  * Allocate drawable ID and memory to store information about it.
42  */
43 int drm_adddraw(struct drm_device *dev, void *data, struct drm_file *file_priv)
44 {
45         unsigned long irqflags;
46         struct drm_draw *draw = data;
47         int new_id = 0;
48         int ret;
49
50 again:
51         if (idr_pre_get(&dev->drw_idr, GFP_KERNEL) == 0) {
52                 DRM_ERROR("Out of memory expanding drawable idr\n");
53                 return -ENOMEM;
54         }
55
56         spin_lock_irqsave(&dev->drw_lock, irqflags);
57         ret = idr_get_new_above(&dev->drw_idr, NULL, 1, &new_id);
58         if (ret == -EAGAIN) {
59                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
60                 goto again;
61         }
62
63         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
64
65         draw->handle = new_id;
66
67         DRM_DEBUG("%d\n", draw->handle);
68
69         return 0;
70 }
71
72 /**
73  * Free drawable ID and memory to store information about it.
74  */
75 int drm_rmdraw(struct drm_device *dev, void *data, struct drm_file *file_priv)
76 {
77         struct drm_draw *draw = data;
78         unsigned long irqflags;
79         struct drm_drawable_info *info;
80
81         spin_lock_irqsave(&dev->drw_lock, irqflags);
82
83         info = drm_get_drawable_info(dev, draw->handle);
84         if (info == NULL) {
85                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
86                 return -EINVAL;
87         }
88         kfree(info->rects);
89         kfree(info);
90
91         idr_remove(&dev->drw_idr, draw->handle);
92
93         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
94         DRM_DEBUG("%d\n", draw->handle);
95         return 0;
96 }
97
98 int drm_update_drawable_info(struct drm_device *dev, void *data, struct drm_file *file_priv)
99 {
100         struct drm_update_draw *update = data;
101         unsigned long irqflags;
102         struct drm_clip_rect *rects;
103         struct drm_drawable_info *info;
104         int err;
105
106         info = idr_find(&dev->drw_idr, update->handle);
107         if (!info) {
108                 info = kzalloc(sizeof(*info), GFP_KERNEL);
109                 if (!info)
110                         return -ENOMEM;
111                 if (IS_ERR(idr_replace(&dev->drw_idr, info, update->handle))) {
112                         DRM_ERROR("No such drawable %d\n", update->handle);
113                         kfree(info);
114                         return -EINVAL;
115                 }
116         }
117
118         switch (update->type) {
119         case DRM_DRAWABLE_CLIPRECTS:
120                 if (update->num == 0)
121                         rects = NULL;
122                 else if (update->num != info->num_rects) {
123                         rects = kmalloc(update->num *
124                                         sizeof(struct drm_clip_rect),
125                                         GFP_KERNEL);
126                 } else
127                         rects = info->rects;
128
129                 if (update->num && !rects) {
130                         DRM_ERROR("Failed to allocate cliprect memory\n");
131                         err = -ENOMEM;
132                         goto error;
133                 }
134
135                 if (update->num && DRM_COPY_FROM_USER(rects,
136                                                      (struct drm_clip_rect __user *)
137                                                      (unsigned long)update->data,
138                                                      update->num *
139                                                      sizeof(*rects))) {
140                         DRM_ERROR("Failed to copy cliprects from userspace\n");
141                         err = -EFAULT;
142                         goto error;
143                 }
144
145                 spin_lock_irqsave(&dev->drw_lock, irqflags);
146
147                 if (rects != info->rects) {
148                         kfree(info->rects);
149                 }
150
151                 info->rects = rects;
152                 info->num_rects = update->num;
153
154                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
155
156                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
157                           info->num_rects, update->handle);
158                 break;
159         default:
160                 DRM_ERROR("Invalid update type %d\n", update->type);
161                 return -EINVAL;
162         }
163
164         return 0;
165
166 error:
167         if (rects != info->rects)
168                 kfree(rects);
169
170         return err;
171 }
172
173 /**
174  * Caller must hold the drawable spinlock!
175  */
176 struct drm_drawable_info *drm_get_drawable_info(struct drm_device *dev, drm_drawable_t id)
177 {
178         return idr_find(&dev->drw_idr, id);
179 }
180 EXPORT_SYMBOL(drm_get_drawable_info);
181
182 static int drm_drawable_free(int idr, void *p, void *data)
183 {
184         struct drm_drawable_info *info = p;
185
186         if (info) {
187                 kfree(info->rects);
188                 kfree(info);
189         }
190
191         return 0;
192 }
193
194 void drm_drawable_free_all(struct drm_device *dev)
195 {
196         idr_for_each(&dev->drw_idr, drm_drawable_free, NULL);
197         idr_remove_all(&dev->drw_idr);
198 }