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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / gpu / drm / drm_drv.c
blobfe58d0833a11c74f7b33b7ac5c169492f4a066fc
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 <drm/drmP.h>
53 #include <drm/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, .name = #ioctl}
61
62 /** Ioctl table */
63 static const struct drm_ioctl_desc drm_ioctls[] = {
64 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_UNLOCKED|DRM_RENDER_ALLOW),
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|DRM_RENDER_ALLOW),
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_noop, 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 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_dma_ioctl, 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, 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, DRM_UNLOCKED),
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|DRM_RENDER_ALLOW),
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_CONTROL_ALLOW|DRM_UNLOCKED),
138
139 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
140 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
141
142 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
151 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
152 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
153 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
154 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
155 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
156 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
157 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
158 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
159 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
160 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
161 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
162 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
163 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
164 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
165 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
166 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
167 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
168 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
169 };
170
171 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
172
173 /**
174 * drm_legacy_dev_reinit
175 *
176 * Reinitializes a legacy/ums drm device in it's lastclose function.
177 */
178 static void drm_legacy_dev_reinit(struct drm_device *dev)
179 {
180 int i;
181
182 if (drm_core_check_feature(dev, DRIVER_MODESET))
183 return;
184
185 atomic_set(&dev->ioctl_count, 0);
186 atomic_set(&dev->vma_count, 0);
187
188 for (i = 0; i < ARRAY_SIZE(dev->counts); i++)
189 atomic_set(&dev->counts[i], 0);
190
191 dev->sigdata.lock = NULL;
192
193 dev->context_flag = 0;
194 dev->last_context = 0;
195 dev->if_version = 0;
196 }
197
198 /**
199 * Take down the DRM device.
200 *
201 * \param dev DRM device structure.
202 *
203 * Frees every resource in \p dev.
204 *
205 * \sa drm_device
206 */
207 int drm_lastclose(struct drm_device * dev)
208 {
209 struct drm_vma_entry *vma, *vma_temp;
210
211 DRM_DEBUG("\n");
212
213 if (dev->driver->lastclose)
214 dev->driver->lastclose(dev);
215 DRM_DEBUG("driver lastclose completed\n");
216
217 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
218 drm_irq_uninstall(dev);
219
220 mutex_lock(&dev->struct_mutex);
221
222 drm_agp_clear(dev);
223
224 drm_legacy_sg_cleanup(dev);
225
226 /* Clear vma list (only built for debugging) */
227 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
228 list_del(&vma->head);
229 kfree(vma);
230 }
231
232 drm_legacy_dma_takedown(dev);
233
234 dev->dev_mapping = NULL;
235 mutex_unlock(&dev->struct_mutex);
236
237 drm_legacy_dev_reinit(dev);
238
239 DRM_DEBUG("lastclose completed\n");
240 return 0;
241 }
242
243 /** File operations structure */
244 static const struct file_operations drm_stub_fops = {
245 .owner = THIS_MODULE,
246 .open = drm_stub_open,
247 .llseek = noop_llseek,
248 };
249
250 static int __init drm_core_init(void)
251 {
252 int ret = -ENOMEM;
253
254 drm_global_init();
255 drm_connector_ida_init();
256 idr_init(&drm_minors_idr);
257
258 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
259 goto err_p1;
260
261 drm_class = drm_sysfs_create(THIS_MODULE, "drm");
262 if (IS_ERR(drm_class)) {
263 printk(KERN_ERR "DRM: Error creating drm class.\n");
264 ret = PTR_ERR(drm_class);
265 goto err_p2;
266 }
267
268 drm_debugfs_root = debugfs_create_dir("dri", NULL);
269 if (!drm_debugfs_root) {
270 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
271 ret = -1;
272 goto err_p3;
273 }
274
275 DRM_INFO("Initialized %s %d.%d.%d %s\n",
276 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
277 return 0;
278 err_p3:
279 drm_sysfs_destroy();
280 err_p2:
281 unregister_chrdev(DRM_MAJOR, "drm");
282
283 idr_destroy(&drm_minors_idr);
284 err_p1:
285 return ret;
286 }
287
288 static void __exit drm_core_exit(void)
289 {
290 debugfs_remove(drm_debugfs_root);
291 drm_sysfs_destroy();
292
293 unregister_chrdev(DRM_MAJOR, "drm");
294
295 drm_connector_ida_destroy();
296 idr_destroy(&drm_minors_idr);
297 }
298
299 module_init(drm_core_init);
300 module_exit(drm_core_exit);
301
302 /**
303 * Copy and IOCTL return string to user space
304 */
305 static int drm_copy_field(char *buf, size_t *buf_len, const char *value)
306 {
307 int len;
308
309 /* don't overflow userbuf */
310 len = strlen(value);
311 if (len > *buf_len)
312 len = *buf_len;
313
314 /* let userspace know exact length of driver value (which could be
315 * larger than the userspace-supplied buffer) */
316 *buf_len = strlen(value);
317
318 /* finally, try filling in the userbuf */
319 if (len && buf)
320 if (copy_to_user(buf, value, len))
321 return -EFAULT;
322 return 0;
323 }
324
325 /**
326 * Get version information
327 *
328 * \param inode device inode.
329 * \param filp file pointer.
330 * \param cmd command.
331 * \param arg user argument, pointing to a drm_version structure.
332 * \return zero on success or negative number on failure.
333 *
334 * Fills in the version information in \p arg.
335 */
336 static int drm_version(struct drm_device *dev, void *data,
337 struct drm_file *file_priv)
338 {
339 struct drm_version *version = data;
340 int err;
341
342 version->version_major = dev->driver->major;
343 version->version_minor = dev->driver->minor;
344 version->version_patchlevel = dev->driver->patchlevel;
345 err = drm_copy_field(version->name, &version->name_len,
346 dev->driver->name);
347 if (!err)
348 err = drm_copy_field(version->date, &version->date_len,
349 dev->driver->date);
350 if (!err)
351 err = drm_copy_field(version->desc, &version->desc_len,
352 dev->driver->desc);
353
354 return err;
355 }
356
357 /**
358 * Called whenever a process performs an ioctl on /dev/drm.
359 *
360 * \param inode device inode.
361 * \param file_priv DRM file private.
362 * \param cmd command.
363 * \param arg user argument.
364 * \return zero on success or negative number on failure.
365 *
366 * Looks up the ioctl function in the ::ioctls table, checking for root
367 * previleges if so required, and dispatches to the respective function.
368 */
369 long drm_ioctl(struct file *filp,
370 unsigned int cmd, unsigned long arg)
371 {
372 struct drm_file *file_priv = filp->private_data;
373 struct drm_device *dev;
374 const struct drm_ioctl_desc *ioctl = NULL;
375 drm_ioctl_t *func;
376 unsigned int nr = DRM_IOCTL_NR(cmd);
377 int retcode = -EINVAL;
378 char stack_kdata[128];
379 char *kdata = NULL;
380 unsigned int usize, asize;
381
382 dev = file_priv->minor->dev;
383
384 if (drm_device_is_unplugged(dev))
385 return -ENODEV;
386
387 atomic_inc(&dev->ioctl_count);
388 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
389 ++file_priv->ioctl_count;
390
391 if ((nr >= DRM_CORE_IOCTL_COUNT) &&
392 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
393 goto err_i1;
394 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
395 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
396 u32 drv_size;
397 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
398 drv_size = _IOC_SIZE(ioctl->cmd_drv);
399 usize = asize = _IOC_SIZE(cmd);
400 if (drv_size > asize)
401 asize = drv_size;
402 cmd = ioctl->cmd_drv;
403 }
404 else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
405 u32 drv_size;
406
407 ioctl = &drm_ioctls[nr];
408
409 drv_size = _IOC_SIZE(ioctl->cmd);
410 usize = asize = _IOC_SIZE(cmd);
411 if (drv_size > asize)
412 asize = drv_size;
413
414 cmd = ioctl->cmd;
415 } else
416 goto err_i1;
417
418 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
419 task_pid_nr(current),
420 (long)old_encode_dev(file_priv->minor->device),
421 file_priv->authenticated, ioctl->name);
422
423 /* Do not trust userspace, use our own definition */
424 func = ioctl->func;
425
426 if (!func) {
427 DRM_DEBUG("no function\n");
428 retcode = -EINVAL;
429 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
430 ((ioctl->flags & DRM_AUTH) && !drm_is_render_client(file_priv) && !file_priv->authenticated) ||
431 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
432 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL)) ||
433 (!(ioctl->flags & DRM_RENDER_ALLOW) && drm_is_render_client(file_priv))) {
434 retcode = -EACCES;
435 } else {
436 if (cmd & (IOC_IN | IOC_OUT)) {
437 if (asize <= sizeof(stack_kdata)) {
438 kdata = stack_kdata;
439 } else {
440 kdata = kmalloc(asize, GFP_KERNEL);
441 if (!kdata) {
442 retcode = -ENOMEM;
443 goto err_i1;
444 }
445 }
446 if (asize > usize)
447 memset(kdata + usize, 0, asize - usize);
448 }
449
450 if (cmd & IOC_IN) {
451 if (copy_from_user(kdata, (void __user *)arg,
452 usize) != 0) {
453 retcode = -EFAULT;
454 goto err_i1;
455 }
456 } else
457 memset(kdata, 0, usize);
458
459 if (ioctl->flags & DRM_UNLOCKED)
460 retcode = func(dev, kdata, file_priv);
461 else {
462 mutex_lock(&drm_global_mutex);
463 retcode = func(dev, kdata, file_priv);
464 mutex_unlock(&drm_global_mutex);
465 }
466
467 if (cmd & IOC_OUT) {
468 if (copy_to_user((void __user *)arg, kdata,
469 usize) != 0)
470 retcode = -EFAULT;
471 }
472 }
473
474 err_i1:
475 if (!ioctl)
476 DRM_DEBUG("invalid iotcl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
477 task_pid_nr(current),
478 (long)old_encode_dev(file_priv->minor->device),
479 file_priv->authenticated, cmd, nr);
480
481 if (kdata != stack_kdata)
482 kfree(kdata);
483 atomic_dec(&dev->ioctl_count);
484 if (retcode)
485 DRM_DEBUG("ret = %d\n", retcode);
486 return retcode;
487 }
488 EXPORT_SYMBOL(drm_ioctl);
Linux with added FPC-III support