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x86: hpet: Fix copy-and-paste mistake in earlier change
[linux/fpc-iii.git] / drivers / gpu / drm / drm_drv.c
blob8a9d0792e4ec3cd4af688faf6751fa6d6617a35e
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 <linux/export.h>
52 #include "drmP.h"
53 #include "drm_core.h"
54
55
56 static int drm_version(struct drm_device *dev, void *data,
57 struct drm_file *file_priv);
58
59 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
60 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0}
61
62 /** Ioctl table */
63 static struct drm_ioctl_desc drm_ioctls[] = {
64 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED),
65 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
66 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
67 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
68 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
69 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
70 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
71 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED),
72 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
73
74 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
75 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
76 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
77 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
78
79 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
80 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
81
82 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
83 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
84
85 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
86 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
87
88 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
89 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
90 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
91 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
92 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
93 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
94 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
95
96 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
97 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
98
99 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
100 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
101
102 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
103
104 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
105 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
106 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
107 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
108 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
109 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
110 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, DRM_AUTH),
111
112 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
113
114 #if __OS_HAS_AGP
115 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
116 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
117 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
118 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
119 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
120 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
121 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
122 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
123 #endif
124
125 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_sg_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
126 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
127
128 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
129
130 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
131
132 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
133
134 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED),
135 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
136 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
137
138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
139
140 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED),
141 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED),
142
143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
151 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
152 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
153 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
154 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
155 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED),
156 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
157 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
158 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
159 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
160 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
161 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
162 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
163 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
164 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
165 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
166 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
167 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
168 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
169 };
170
171 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
172
173 /**
174 * Take down the DRM device.
175 *
176 * \param dev DRM device structure.
177 *
178 * Frees every resource in \p dev.
179 *
180 * \sa drm_device
181 */
182 int drm_lastclose(struct drm_device * dev)
183 {
184 struct drm_vma_entry *vma, *vma_temp;
185 int i;
186
187 DRM_DEBUG("\n");
188
189 if (dev->driver->lastclose)
190 dev->driver->lastclose(dev);
191 DRM_DEBUG("driver lastclose completed\n");
192
193 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
194 drm_irq_uninstall(dev);
195
196 mutex_lock(&dev->struct_mutex);
197
198 /* Clear AGP information */
199 if (drm_core_has_AGP(dev) && dev->agp &&
200 !drm_core_check_feature(dev, DRIVER_MODESET)) {
201 struct drm_agp_mem *entry, *tempe;
202
203 /* Remove AGP resources, but leave dev->agp
204 intact until drv_cleanup is called. */
205 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
206 if (entry->bound)
207 drm_unbind_agp(entry->memory);
208 drm_free_agp(entry->memory, entry->pages);
209 kfree(entry);
210 }
211 INIT_LIST_HEAD(&dev->agp->memory);
212
213 if (dev->agp->acquired)
214 drm_agp_release(dev);
215
216 dev->agp->acquired = 0;
217 dev->agp->enabled = 0;
218 }
219 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
220 !drm_core_check_feature(dev, DRIVER_MODESET)) {
221 drm_sg_cleanup(dev->sg);
222 dev->sg = NULL;
223 }
224
225 /* Clear vma list (only built for debugging) */
226 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
227 list_del(&vma->head);
228 kfree(vma);
229 }
230
231 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
232 for (i = 0; i < dev->queue_count; i++) {
233 kfree(dev->queuelist[i]);
234 dev->queuelist[i] = NULL;
235 }
236 kfree(dev->queuelist);
237 dev->queuelist = NULL;
238 }
239 dev->queue_count = 0;
240
241 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA) &&
242 !drm_core_check_feature(dev, DRIVER_MODESET))
243 drm_dma_takedown(dev);
244
245 dev->dev_mapping = NULL;
246 mutex_unlock(&dev->struct_mutex);
247
248 DRM_DEBUG("lastclose completed\n");
249 return 0;
250 }
251
252 /** File operations structure */
253 static const struct file_operations drm_stub_fops = {
254 .owner = THIS_MODULE,
255 .open = drm_stub_open,
256 .llseek = noop_llseek,
257 };
258
259 static int __init drm_core_init(void)
260 {
261 int ret = -ENOMEM;
262
263 drm_global_init();
264 idr_init(&drm_minors_idr);
265
266 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
267 goto err_p1;
268
269 drm_class = drm_sysfs_create(THIS_MODULE, "drm");
270 if (IS_ERR(drm_class)) {
271 printk(KERN_ERR "DRM: Error creating drm class.\n");
272 ret = PTR_ERR(drm_class);
273 goto err_p2;
274 }
275
276 drm_proc_root = proc_mkdir("dri", NULL);
277 if (!drm_proc_root) {
278 DRM_ERROR("Cannot create /proc/dri\n");
279 ret = -1;
280 goto err_p3;
281 }
282
283 drm_debugfs_root = debugfs_create_dir("dri", NULL);
284 if (!drm_debugfs_root) {
285 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
286 ret = -1;
287 goto err_p3;
288 }
289
290 DRM_INFO("Initialized %s %d.%d.%d %s\n",
291 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
292 return 0;
293 err_p3:
294 drm_sysfs_destroy();
295 err_p2:
296 unregister_chrdev(DRM_MAJOR, "drm");
297
298 idr_destroy(&drm_minors_idr);
299 err_p1:
300 return ret;
301 }
302
303 static void __exit drm_core_exit(void)
304 {
305 remove_proc_entry("dri", NULL);
306 debugfs_remove(drm_debugfs_root);
307 drm_sysfs_destroy();
308
309 unregister_chrdev(DRM_MAJOR, "drm");
310
311 idr_remove_all(&drm_minors_idr);
312 idr_destroy(&drm_minors_idr);
313 }
314
315 module_init(drm_core_init);
316 module_exit(drm_core_exit);
317
318 /**
319 * Copy and IOCTL return string to user space
320 */
321 static int drm_copy_field(char *buf, size_t *buf_len, const char *value)
322 {
323 int len;
324
325 /* don't overflow userbuf */
326 len = strlen(value);
327 if (len > *buf_len)
328 len = *buf_len;
329
330 /* let userspace know exact length of driver value (which could be
331 * larger than the userspace-supplied buffer) */
332 *buf_len = strlen(value);
333
334 /* finally, try filling in the userbuf */
335 if (len && buf)
336 if (copy_to_user(buf, value, len))
337 return -EFAULT;
338 return 0;
339 }
340
341 /**
342 * Get version information
343 *
344 * \param inode device inode.
345 * \param filp file pointer.
346 * \param cmd command.
347 * \param arg user argument, pointing to a drm_version structure.
348 * \return zero on success or negative number on failure.
349 *
350 * Fills in the version information in \p arg.
351 */
352 static int drm_version(struct drm_device *dev, void *data,
353 struct drm_file *file_priv)
354 {
355 struct drm_version *version = data;
356 int err;
357
358 version->version_major = dev->driver->major;
359 version->version_minor = dev->driver->minor;
360 version->version_patchlevel = dev->driver->patchlevel;
361 err = drm_copy_field(version->name, &version->name_len,
362 dev->driver->name);
363 if (!err)
364 err = drm_copy_field(version->date, &version->date_len,
365 dev->driver->date);
366 if (!err)
367 err = drm_copy_field(version->desc, &version->desc_len,
368 dev->driver->desc);
369
370 return err;
371 }
372
373 /**
374 * Called whenever a process performs an ioctl on /dev/drm.
375 *
376 * \param inode device inode.
377 * \param file_priv DRM file private.
378 * \param cmd command.
379 * \param arg user argument.
380 * \return zero on success or negative number on failure.
381 *
382 * Looks up the ioctl function in the ::ioctls table, checking for root
383 * previleges if so required, and dispatches to the respective function.
384 */
385 long drm_ioctl(struct file *filp,
386 unsigned int cmd, unsigned long arg)
387 {
388 struct drm_file *file_priv = filp->private_data;
389 struct drm_device *dev;
390 struct drm_ioctl_desc *ioctl;
391 drm_ioctl_t *func;
392 unsigned int nr = DRM_IOCTL_NR(cmd);
393 int retcode = -EINVAL;
394 char stack_kdata[128];
395 char *kdata = NULL;
396 unsigned int usize, asize;
397
398 dev = file_priv->minor->dev;
399
400 if (drm_device_is_unplugged(dev))
401 return -ENODEV;
402
403 atomic_inc(&dev->ioctl_count);
404 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
405 ++file_priv->ioctl_count;
406
407 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
408 task_pid_nr(current), cmd, nr,
409 (long)old_encode_dev(file_priv->minor->device),
410 file_priv->authenticated);
411
412 if ((nr >= DRM_CORE_IOCTL_COUNT) &&
413 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
414 goto err_i1;
415 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
416 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
417 u32 drv_size;
418 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
419 drv_size = _IOC_SIZE(ioctl->cmd_drv);
420 usize = asize = _IOC_SIZE(cmd);
421 if (drv_size > asize)
422 asize = drv_size;
423 }
424 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
425 ioctl = &drm_ioctls[nr];
426 cmd = ioctl->cmd;
427 usize = asize = _IOC_SIZE(cmd);
428 } else
429 goto err_i1;
430
431 /* Do not trust userspace, use our own definition */
432 func = ioctl->func;
433 /* is there a local override? */
434 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
435 func = dev->driver->dma_ioctl;
436
437 if (!func) {
438 DRM_DEBUG("no function\n");
439 retcode = -EINVAL;
440 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
441 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
442 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
443 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
444 retcode = -EACCES;
445 } else {
446 if (cmd & (IOC_IN | IOC_OUT)) {
447 if (asize <= sizeof(stack_kdata)) {
448 kdata = stack_kdata;
449 } else {
450 kdata = kmalloc(asize, GFP_KERNEL);
451 if (!kdata) {
452 retcode = -ENOMEM;
453 goto err_i1;
454 }
455 }
456 if (asize > usize)
457 memset(kdata + usize, 0, asize - usize);
458 }
459
460 if (cmd & IOC_IN) {
461 if (copy_from_user(kdata, (void __user *)arg,
462 usize) != 0) {
463 retcode = -EFAULT;
464 goto err_i1;
465 }
466 } else
467 memset(kdata, 0, usize);
468
469 if (ioctl->flags & DRM_UNLOCKED)
470 retcode = func(dev, kdata, file_priv);
471 else {
472 mutex_lock(&drm_global_mutex);
473 retcode = func(dev, kdata, file_priv);
474 mutex_unlock(&drm_global_mutex);
475 }
476
477 if (cmd & IOC_OUT) {
478 if (copy_to_user((void __user *)arg, kdata,
479 usize) != 0)
480 retcode = -EFAULT;
481 }
482 }
483
484 err_i1:
485 if (kdata != stack_kdata)
486 kfree(kdata);
487 atomic_dec(&dev->ioctl_count);
488 if (retcode)
489 DRM_DEBUG("ret = %x\n", retcode);
490 return retcode;
491 }
492
493 EXPORT_SYMBOL(drm_ioctl);
494
495 struct drm_local_map *drm_getsarea(struct drm_device *dev)
496 {
497 struct drm_map_list *entry;
498
499 list_for_each_entry(entry, &dev->maplist, head) {
500 if (entry->map && entry->map->type == _DRM_SHM &&
501 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
502 return entry->map;
503 }
504 }
505 return NULL;
506 }
507 EXPORT_SYMBOL(drm_getsarea);
Linux with added FPC-III support