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Merge remote-tracking branch 'moduleh/module.h-split'
[linux-2.6/next.git] / drivers / gpu / drm / drm_drv.c
blob93a112d45c1ad11b74e7b9fece1e84d236c01b5d
1 /**
2 * \file drm_drv.c
3 * Generic driver template
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 *
8 * To use this template, you must at least define the following (samples
9 * given for the MGA driver):
10 *
11 * \code
12 * #define DRIVER_AUTHOR "VA Linux Systems, Inc."
13 *
14 * #define DRIVER_NAME "mga"
15 * #define DRIVER_DESC "Matrox G200/G400"
16 * #define DRIVER_DATE "20001127"
17 *
18 * #define drm_x mga_##x
19 * \endcode
20 */
21
22 /*
23 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
24 *
25 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
26 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
27 * All Rights Reserved.
28 *
29 * Permission is hereby granted, free of charge, to any person obtaining a
30 * copy of this software and associated documentation files (the "Software"),
31 * to deal in the Software without restriction, including without limitation
32 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
33 * and/or sell copies of the Software, and to permit persons to whom the
34 * Software is furnished to do so, subject to the following conditions:
35 *
36 * The above copyright notice and this permission notice (including the next
37 * paragraph) shall be included in all copies or substantial portions of the
38 * Software.
39 *
40 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
41 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
42 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
43 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
44 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
45 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
46 * OTHER DEALINGS IN THE SOFTWARE.
47 */
48
49 #include <linux/debugfs.h>
50 #include <linux/slab.h>
51 #include "drmP.h"
52 #include "drm_core.h"
53
54
55 static int drm_version(struct drm_device *dev, void *data,
56 struct drm_file *file_priv);
57
58 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
59 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0}
60
61 /** Ioctl table */
62 static struct drm_ioctl_desc drm_ioctls[] = {
63 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
64 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
65 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
66 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
67 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
68 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
69 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
70 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, 0),
71 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
72
73 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
74 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
75 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
76 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
77
78 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
79 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
80
81 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
82 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
83
84 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
85 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
86
87 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
88 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
89 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
90 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
91 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
92 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
93 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
94
95 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
96 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
97
98 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
99 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
100
101 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
102
103 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
104 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
105 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
106 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
107 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
108 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
109 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
110
111 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
112
113 #if __OS_HAS_AGP
114 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
115 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
116 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
117 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
118 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
119 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
120 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
121 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
122 #endif
123
124 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
125 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
126
127 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, 0),
128
129 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
130
131 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
132
133 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED),
134 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
135 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
136
137 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
139 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
140 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
141 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER|DRM_UNLOCKED),
142 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED),
148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
151 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
152 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
153 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
154 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
155 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
156 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
157 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED)
158 };
159
160 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
161
162 /**
163 * Take down the DRM device.
164 *
165 * \param dev DRM device structure.
166 *
167 * Frees every resource in \p dev.
168 *
169 * \sa drm_device
170 */
171 int drm_lastclose(struct drm_device * dev)
172 {
173 struct drm_vma_entry *vma, *vma_temp;
174 int i;
175
176 DRM_DEBUG("\n");
177
178 if (dev->driver->lastclose)
179 dev->driver->lastclose(dev);
180 DRM_DEBUG("driver lastclose completed\n");
181
182 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
183 drm_irq_uninstall(dev);
184
185 mutex_lock(&dev->struct_mutex);
186
187 /* Clear AGP information */
188 if (drm_core_has_AGP(dev) && dev->agp &&
189 !drm_core_check_feature(dev, DRIVER_MODESET)) {
190 struct drm_agp_mem *entry, *tempe;
191
192 /* Remove AGP resources, but leave dev->agp
193 intact until drv_cleanup is called. */
194 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
195 if (entry->bound)
196 drm_unbind_agp(entry->memory);
197 drm_free_agp(entry->memory, entry->pages);
198 kfree(entry);
199 }
200 INIT_LIST_HEAD(&dev->agp->memory);
201
202 if (dev->agp->acquired)
203 drm_agp_release(dev);
204
205 dev->agp->acquired = 0;
206 dev->agp->enabled = 0;
207 }
208 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
209 !drm_core_check_feature(dev, DRIVER_MODESET)) {
210 drm_sg_cleanup(dev->sg);
211 dev->sg = NULL;
212 }
213
214 /* Clear vma list (only built for debugging) */
215 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
216 list_del(&vma->head);
217 kfree(vma);
218 }
219
220 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
221 for (i = 0; i < dev->queue_count; i++) {
222 kfree(dev->queuelist[i]);
223 dev->queuelist[i] = NULL;
224 }
225 kfree(dev->queuelist);
226 dev->queuelist = NULL;
227 }
228 dev->queue_count = 0;
229
230 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
231 !drm_core_check_feature(dev, DRIVER_MODESET))
232 drm_dma_takedown(dev);
233
234 dev->dev_mapping = NULL;
235 mutex_unlock(&dev->struct_mutex);
236
237 DRM_DEBUG("lastclose completed\n");
238 return 0;
239 }
240
241 /** File operations structure */
242 static const struct file_operations drm_stub_fops = {
243 .owner = THIS_MODULE,
244 .open = drm_stub_open,
245 .llseek = noop_llseek,
246 };
247
248 static int __init drm_core_init(void)
249 {
250 int ret = -ENOMEM;
251
252 drm_global_init();
253 idr_init(&drm_minors_idr);
254
255 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
256 goto err_p1;
257
258 drm_class = drm_sysfs_create(THIS_MODULE, "drm");
259 if (IS_ERR(drm_class)) {
260 printk(KERN_ERR "DRM: Error creating drm class.\n");
261 ret = PTR_ERR(drm_class);
262 goto err_p2;
263 }
264
265 drm_proc_root = proc_mkdir("dri", NULL);
266 if (!drm_proc_root) {
267 DRM_ERROR("Cannot create /proc/dri\n");
268 ret = -1;
269 goto err_p3;
270 }
271
272 drm_debugfs_root = debugfs_create_dir("dri", NULL);
273 if (!drm_debugfs_root) {
274 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
275 ret = -1;
276 goto err_p3;
277 }
278
279 DRM_INFO("Initialized %s %d.%d.%d %s\n",
280 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
281 return 0;
282 err_p3:
283 drm_sysfs_destroy();
284 err_p2:
285 unregister_chrdev(DRM_MAJOR, "drm");
286
287 idr_destroy(&drm_minors_idr);
288 err_p1:
289 return ret;
290 }
291
292 static void __exit drm_core_exit(void)
293 {
294 remove_proc_entry("dri", NULL);
295 debugfs_remove(drm_debugfs_root);
296 drm_sysfs_destroy();
297
298 unregister_chrdev(DRM_MAJOR, "drm");
299
300 idr_remove_all(&drm_minors_idr);
301 idr_destroy(&drm_minors_idr);
302 }
303
304 module_init(drm_core_init);
305 module_exit(drm_core_exit);
306
307 /**
308 * Copy and IOCTL return string to user space
309 */
310 static int drm_copy_field(char *buf, size_t *buf_len, const char *value)
311 {
312 int len;
313
314 /* don't overflow userbuf */
315 len = strlen(value);
316 if (len > *buf_len)
317 len = *buf_len;
318
319 /* let userspace know exact length of driver value (which could be
320 * larger than the userspace-supplied buffer) */
321 *buf_len = strlen(value);
322
323 /* finally, try filling in the userbuf */
324 if (len && buf)
325 if (copy_to_user(buf, value, len))
326 return -EFAULT;
327 return 0;
328 }
329
330 /**
331 * Get version information
332 *
333 * \param inode device inode.
334 * \param filp file pointer.
335 * \param cmd command.
336 * \param arg user argument, pointing to a drm_version structure.
337 * \return zero on success or negative number on failure.
338 *
339 * Fills in the version information in \p arg.
340 */
341 static int drm_version(struct drm_device *dev, void *data,
342 struct drm_file *file_priv)
343 {
344 struct drm_version *version = data;
345 int err;
346
347 version->version_major = dev->driver->major;
348 version->version_minor = dev->driver->minor;
349 version->version_patchlevel = dev->driver->patchlevel;
350 err = drm_copy_field(version->name, &version->name_len,
351 dev->driver->name);
352 if (!err)
353 err = drm_copy_field(version->date, &version->date_len,
354 dev->driver->date);
355 if (!err)
356 err = drm_copy_field(version->desc, &version->desc_len,
357 dev->driver->desc);
358
359 return err;
360 }
361
362 /**
363 * Called whenever a process performs an ioctl on /dev/drm.
364 *
365 * \param inode device inode.
366 * \param file_priv DRM file private.
367 * \param cmd command.
368 * \param arg user argument.
369 * \return zero on success or negative number on failure.
370 *
371 * Looks up the ioctl function in the ::ioctls table, checking for root
372 * previleges if so required, and dispatches to the respective function.
373 */
374 long drm_ioctl(struct file *filp,
375 unsigned int cmd, unsigned long arg)
376 {
377 struct drm_file *file_priv = filp->private_data;
378 struct drm_device *dev;
379 struct drm_ioctl_desc *ioctl;
380 drm_ioctl_t *func;
381 unsigned int nr = DRM_IOCTL_NR(cmd);
382 int retcode = -EINVAL;
383 char stack_kdata[128];
384 char *kdata = NULL;
385 unsigned int usize, asize;
386
387 dev = file_priv->minor->dev;
388 atomic_inc(&dev->ioctl_count);
389 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
390 ++file_priv->ioctl_count;
391
392 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
393 task_pid_nr(current), cmd, nr,
394 (long)old_encode_dev(file_priv->minor->device),
395 file_priv->authenticated);
396
397 if ((nr >= DRM_CORE_IOCTL_COUNT) &&
398 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
399 goto err_i1;
400 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
401 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
402 u32 drv_size;
403 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
404 drv_size = _IOC_SIZE(ioctl->cmd_drv);
405 usize = asize = _IOC_SIZE(cmd);
406 if (drv_size > asize)
407 asize = drv_size;
408 }
409 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
410 ioctl = &drm_ioctls[nr];
411 cmd = ioctl->cmd;
412 usize = asize = _IOC_SIZE(cmd);
413 } else
414 goto err_i1;
415
416 /* Do not trust userspace, use our own definition */
417 func = ioctl->func;
418 /* is there a local override? */
419 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
420 func = dev->driver->dma_ioctl;
421
422 if (!func) {
423 DRM_DEBUG("no function\n");
424 retcode = -EINVAL;
425 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
426 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
427 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
428 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
429 retcode = -EACCES;
430 } else {
431 if (cmd & (IOC_IN | IOC_OUT)) {
432 if (asize <= sizeof(stack_kdata)) {
433 kdata = stack_kdata;
434 } else {
435 kdata = kmalloc(asize, GFP_KERNEL);
436 if (!kdata) {
437 retcode = -ENOMEM;
438 goto err_i1;
439 }
440 }
441 }
442
443 if (cmd & IOC_IN) {
444 if (copy_from_user(kdata, (void __user *)arg,
445 usize) != 0) {
446 retcode = -EFAULT;
447 goto err_i1;
448 }
449 } else
450 memset(kdata, 0, usize);
451
452 if (ioctl->flags & DRM_UNLOCKED)
453 retcode = func(dev, kdata, file_priv);
454 else {
455 mutex_lock(&drm_global_mutex);
456 retcode = func(dev, kdata, file_priv);
457 mutex_unlock(&drm_global_mutex);
458 }
459
460 if (cmd & IOC_OUT) {
461 if (copy_to_user((void __user *)arg, kdata,
462 usize) != 0)
463 retcode = -EFAULT;
464 }
465 }
466
467 err_i1:
468 if (kdata != stack_kdata)
469 kfree(kdata);
470 atomic_dec(&dev->ioctl_count);
471 if (retcode)
472 DRM_DEBUG("ret = %x\n", retcode);
473 return retcode;
474 }
475
476 EXPORT_SYMBOL(drm_ioctl);
477
478 struct drm_local_map *drm_getsarea(struct drm_device *dev)
479 {
480 struct drm_map_list *entry;
481
482 list_for_each_entry(entry, &dev->maplist, head) {
483 if (entry->map && entry->map->type == _DRM_SHM &&
484 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
485 return entry->map;
486 }
487 }
488 return NULL;
489 }
490 EXPORT_SYMBOL(drm_getsarea);
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