Pull button into test branch
[linux-2.6] / drivers / char / 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(DRM_IOCTL_ARGS)
44 {
45         DRM_DEVICE;
46         unsigned long irqflags;
47         int i, j;
48         u32 *bitfield = dev->drw_bitfield;
49         unsigned int bitfield_length = dev->drw_bitfield_length;
50         drm_drawable_info_t **info = dev->drw_info;
51         unsigned int info_length = dev->drw_info_length;
52         drm_draw_t draw;
53
54         for (i = 0, j = 0; i < bitfield_length; i++) {
55                 if (bitfield[i] == ~0)
56                         continue;
57
58                 for (; j < 8 * sizeof(*bitfield); j++)
59                         if (!(bitfield[i] & (1 << j)))
60                                 goto done;
61         }
62 done:
63
64         if (i == bitfield_length) {
65                 bitfield_length++;
66
67                 bitfield = drm_alloc(bitfield_length * sizeof(*bitfield),
68                                      DRM_MEM_BUFS);
69
70                 if (!bitfield) {
71                         DRM_ERROR("Failed to allocate new drawable bitfield\n");
72                         return DRM_ERR(ENOMEM);
73                 }
74
75                 if (8 * sizeof(*bitfield) * bitfield_length > info_length) {
76                         info_length += 8 * sizeof(*bitfield);
77
78                         info = drm_alloc(info_length * sizeof(*info),
79                                          DRM_MEM_BUFS);
80
81                         if (!info) {
82                                 DRM_ERROR("Failed to allocate new drawable info"
83                                           " array\n");
84
85                                 drm_free(bitfield,
86                                          bitfield_length * sizeof(*bitfield),
87                                          DRM_MEM_BUFS);
88                                 return DRM_ERR(ENOMEM);
89                         }
90                 }
91
92                 bitfield[i] = 0;
93         }
94
95         draw.handle = i * 8 * sizeof(*bitfield) + j + 1;
96         DRM_DEBUG("%d\n", draw.handle);
97
98         spin_lock_irqsave(&dev->drw_lock, irqflags);
99
100         bitfield[i] |= 1 << j;
101         info[draw.handle - 1] = NULL;
102
103         if (bitfield != dev->drw_bitfield) {
104                 memcpy(bitfield, dev->drw_bitfield, dev->drw_bitfield_length *
105                        sizeof(*bitfield));
106                 drm_free(dev->drw_bitfield, sizeof(*bitfield) *
107                          dev->drw_bitfield_length, DRM_MEM_BUFS);
108                 dev->drw_bitfield = bitfield;
109                 dev->drw_bitfield_length = bitfield_length;
110         }
111
112         if (info != dev->drw_info) {
113                 memcpy(info, dev->drw_info, dev->drw_info_length *
114                        sizeof(*info));
115                 drm_free(dev->drw_info, sizeof(*info) * dev->drw_info_length,
116                          DRM_MEM_BUFS);
117                 dev->drw_info = info;
118                 dev->drw_info_length = info_length;
119         }
120
121         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
122
123         DRM_COPY_TO_USER_IOCTL((drm_draw_t __user *)data, draw, sizeof(draw));
124
125         return 0;
126 }
127
128 /**
129  * Free drawable ID and memory to store information about it.
130  */
131 int drm_rmdraw(DRM_IOCTL_ARGS)
132 {
133         DRM_DEVICE;
134         drm_draw_t draw;
135         int id, idx;
136         unsigned int shift;
137         unsigned long irqflags;
138         u32 *bitfield = dev->drw_bitfield;
139         unsigned int bitfield_length = dev->drw_bitfield_length;
140         drm_drawable_info_t **info = dev->drw_info;
141         unsigned int info_length = dev->drw_info_length;
142
143         DRM_COPY_FROM_USER_IOCTL(draw, (drm_draw_t __user *) data,
144                                  sizeof(draw));
145
146         id = draw.handle - 1;
147         idx = id / (8 * sizeof(*bitfield));
148         shift = id % (8 * sizeof(*bitfield));
149
150         if (idx < 0 || idx >= bitfield_length ||
151             !(bitfield[idx] & (1 << shift))) {
152                 DRM_DEBUG("No such drawable %d\n", draw.handle);
153                 return 0;
154         }
155
156         spin_lock_irqsave(&dev->drw_lock, irqflags);
157
158         bitfield[idx] &= ~(1 << shift);
159
160         spin_unlock_irqrestore(&dev->drw_lock, irqflags);
161
162         if (info[id]) {
163                 drm_free(info[id]->rects, info[id]->num_rects *
164                          sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
165                 drm_free(info[id], sizeof(**info), DRM_MEM_BUFS);
166         }
167
168         /* Can we shrink the arrays? */
169         if (idx == bitfield_length - 1) {
170                 while (idx >= 0 && !bitfield[idx])
171                         --idx;
172
173                 bitfield_length = idx + 1;
174
175                 if (idx != id / (8 * sizeof(*bitfield)))
176                         bitfield = drm_alloc(bitfield_length *
177                                              sizeof(*bitfield), DRM_MEM_BUFS);
178
179                 if (!bitfield && bitfield_length) {
180                         bitfield = dev->drw_bitfield;
181                         bitfield_length = dev->drw_bitfield_length;
182                 }
183         }
184
185         if (bitfield != dev->drw_bitfield) {
186                 info_length = 8 * sizeof(*bitfield) * bitfield_length;
187
188                 info = drm_alloc(info_length * sizeof(*info), DRM_MEM_BUFS);
189
190                 if (!info && info_length) {
191                         info = dev->drw_info;
192                         info_length = dev->drw_info_length;
193                 }
194
195                 spin_lock_irqsave(&dev->drw_lock, irqflags);
196
197                 memcpy(bitfield, dev->drw_bitfield, bitfield_length *
198                        sizeof(*bitfield));
199                 drm_free(dev->drw_bitfield, sizeof(*bitfield) *
200                          dev->drw_bitfield_length, DRM_MEM_BUFS);
201                 dev->drw_bitfield = bitfield;
202                 dev->drw_bitfield_length = bitfield_length;
203
204                 if (info != dev->drw_info) {
205                         memcpy(info, dev->drw_info, info_length *
206                                sizeof(*info));
207                         drm_free(dev->drw_info, sizeof(*info) *
208                                  dev->drw_info_length, DRM_MEM_BUFS);
209                         dev->drw_info = info;
210                         dev->drw_info_length = info_length;
211                 }
212
213                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
214         }
215
216         DRM_DEBUG("%d\n", draw.handle);
217         return 0;
218 }
219
220 int drm_update_drawable_info(DRM_IOCTL_ARGS) {
221         DRM_DEVICE;
222         drm_update_draw_t update;
223         unsigned int id, idx, shift;
224         u32 *bitfield = dev->drw_bitfield;
225         unsigned long irqflags, bitfield_length = dev->drw_bitfield_length;
226         drm_drawable_info_t *info;
227         drm_clip_rect_t *rects;
228         int err;
229
230         DRM_COPY_FROM_USER_IOCTL(update, (drm_update_draw_t __user *) data,
231                                  sizeof(update));
232
233         id = update.handle - 1;
234         idx = id / (8 * sizeof(*bitfield));
235         shift = id % (8 * sizeof(*bitfield));
236
237         if (idx < 0 || idx >= bitfield_length ||
238             !(bitfield[idx] & (1 << shift))) {
239                 DRM_ERROR("No such drawable %d\n", update.handle);
240                 return DRM_ERR(EINVAL);
241         }
242
243         info = dev->drw_info[id];
244
245         if (!info) {
246                 info = drm_calloc(1, sizeof(drm_drawable_info_t), DRM_MEM_BUFS);
247
248                 if (!info) {
249                         DRM_ERROR("Failed to allocate drawable info memory\n");
250                         return DRM_ERR(ENOMEM);
251                 }
252         }
253
254         switch (update.type) {
255         case DRM_DRAWABLE_CLIPRECTS:
256                 if (update.num != info->num_rects) {
257                         rects = drm_alloc(update.num * sizeof(drm_clip_rect_t),
258                                          DRM_MEM_BUFS);
259                 } else
260                         rects = info->rects;
261
262                 if (update.num && !rects) {
263                         DRM_ERROR("Failed to allocate cliprect memory\n");
264                         err = DRM_ERR(ENOMEM);
265                         goto error;
266                 }
267
268                 if (update.num && DRM_COPY_FROM_USER(rects,
269                                                      (drm_clip_rect_t __user *)
270                                                      (unsigned long)update.data,
271                                                      update.num *
272                                                      sizeof(*rects))) {
273                         DRM_ERROR("Failed to copy cliprects from userspace\n");
274                         err = DRM_ERR(EFAULT);
275                         goto error;
276                 }
277
278                 spin_lock_irqsave(&dev->drw_lock, irqflags);
279
280                 if (rects != info->rects) {
281                         drm_free(info->rects, info->num_rects *
282                                  sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
283                 }
284
285                 info->rects = rects;
286                 info->num_rects = update.num;
287                 dev->drw_info[id] = info;
288
289                 spin_unlock_irqrestore(&dev->drw_lock, irqflags);
290
291                 DRM_DEBUG("Updated %d cliprects for drawable %d\n",
292                           info->num_rects, id);
293                 break;
294         default:
295                 DRM_ERROR("Invalid update type %d\n", update.type);
296                 return DRM_ERR(EINVAL);
297         }
298
299         return 0;
300
301 error:
302         if (!dev->drw_info[id])
303                 drm_free(info, sizeof(*info), DRM_MEM_BUFS);
304         else if (rects != dev->drw_info[id]->rects)
305                 drm_free(rects, update.num *
306                          sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
307
308         return err;
309 }
310
311 /**
312  * Caller must hold the drawable spinlock!
313  */
314 drm_drawable_info_t *drm_get_drawable_info(drm_device_t *dev, drm_drawable_t id) {
315         u32 *bitfield = dev->drw_bitfield;
316         unsigned int idx, shift;
317
318         id--;
319         idx = id / (8 * sizeof(*bitfield));
320         shift = id % (8 * sizeof(*bitfield));
321
322         if (idx < 0 || idx >= dev->drw_bitfield_length ||
323             !(bitfield[idx] & (1 << shift))) {
324                 DRM_DEBUG("No such drawable %d\n", id);
325                 return NULL;
326         }
327
328         return dev->drw_info[id];
329 }
330 EXPORT_SYMBOL(drm_get_drawable_info);