drm/i915: export error state ref handling
[deliverable/linux.git] / drivers / gpu / drm / drm_drv.c
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),
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_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_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_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
154 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
155 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 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_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_CONTROL_ALLOW|DRM_UNLOCKED),
160 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
161 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, 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_CONTROL_ALLOW|DRM_UNLOCKED),
165 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
166 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
167 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 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 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
170 };
171
172 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
173
174 /**
175 * Take down the DRM device.
176 *
177 * \param dev DRM device structure.
178 *
179 * Frees every resource in \p dev.
180 *
181 * \sa drm_device
182 */
183 int drm_lastclose(struct drm_device * dev)
184 {
185 struct drm_vma_entry *vma, *vma_temp;
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_HAVE_DMA) &&
232 !drm_core_check_feature(dev, DRIVER_MODESET))
233 drm_dma_takedown(dev);
234
235 dev->dev_mapping = NULL;
236 mutex_unlock(&dev->struct_mutex);
237
238 DRM_DEBUG("lastclose completed\n");
239 return 0;
240 }
241
242 /** File operations structure */
243 static const struct file_operations drm_stub_fops = {
244 .owner = THIS_MODULE,
245 .open = drm_stub_open,
246 .llseek = noop_llseek,
247 };
248
249 static int __init drm_core_init(void)
250 {
251 int ret = -ENOMEM;
252
253 drm_global_init();
254 idr_init(&drm_minors_idr);
255
256 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
257 goto err_p1;
258
259 drm_class = drm_sysfs_create(THIS_MODULE, "drm");
260 if (IS_ERR(drm_class)) {
261 printk(KERN_ERR "DRM: Error creating drm class.\n");
262 ret = PTR_ERR(drm_class);
263 goto err_p2;
264 }
265
266 drm_proc_root = proc_mkdir("dri", NULL);
267 if (!drm_proc_root) {
268 DRM_ERROR("Cannot create /proc/dri\n");
269 ret = -1;
270 goto err_p3;
271 }
272
273 drm_debugfs_root = debugfs_create_dir("dri", NULL);
274 if (!drm_debugfs_root) {
275 DRM_ERROR("Cannot create /sys/kernel/debug/dri\n");
276 ret = -1;
277 goto err_p3;
278 }
279
280 DRM_INFO("Initialized %s %d.%d.%d %s\n",
281 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
282 return 0;
283 err_p3:
284 drm_sysfs_destroy();
285 err_p2:
286 unregister_chrdev(DRM_MAJOR, "drm");
287
288 idr_destroy(&drm_minors_idr);
289 err_p1:
290 return ret;
291 }
292
293 static void __exit drm_core_exit(void)
294 {
295 remove_proc_entry("dri", NULL);
296 debugfs_remove(drm_debugfs_root);
297 drm_sysfs_destroy();
298
299 unregister_chrdev(DRM_MAJOR, "drm");
300
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 const struct drm_ioctl_desc *ioctl = NULL;
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
389 if (drm_device_is_unplugged(dev))
390 return -ENODEV;
391
392 atomic_inc(&dev->ioctl_count);
393 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
394 ++file_priv->ioctl_count;
395
396 if ((nr >= DRM_CORE_IOCTL_COUNT) &&
397 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
398 goto err_i1;
399 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
400 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
401 u32 drv_size;
402 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
403 drv_size = _IOC_SIZE(ioctl->cmd_drv);
404 usize = asize = _IOC_SIZE(cmd);
405 if (drv_size > asize)
406 asize = drv_size;
407 cmd = ioctl->cmd_drv;
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 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
417 task_pid_nr(current),
418 (long)old_encode_dev(file_priv->minor->device),
419 file_priv->authenticated, ioctl->name);
420
421 /* Do not trust userspace, use our own definition */
422 func = ioctl->func;
423 /* is there a local override? */
424 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
425 func = dev->driver->dma_ioctl;
426
427 if (!func) {
428 DRM_DEBUG("no function\n");
429 retcode = -EINVAL;
430 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
431 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
432 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
433 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
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
489 EXPORT_SYMBOL(drm_ioctl);
490
491 struct drm_local_map *drm_getsarea(struct drm_device *dev)
492 {
493 struct drm_map_list *entry;
494
495 list_for_each_entry(entry, &dev->maplist, head) {
496 if (entry->map && entry->map->type == _DRM_SHM &&
497 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
498 return entry->map;
499 }
500 }
501 return NULL;
502 }
503 EXPORT_SYMBOL(drm_getsarea);
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