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drm_drv.c
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1 
22 /*
23  * Created: Thu Nov 23 03:10:50 2000 by [email protected]
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}
61 
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_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_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_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 };
170 
171 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
172 
182 int drm_lastclose(struct drm_device * dev)
183 {
184  struct drm_vma_entry *vma, *vma_temp;
185 
186  DRM_DEBUG("\n");
187 
188  if (dev->driver->lastclose)
189  dev->driver->lastclose(dev);
190  DRM_DEBUG("driver lastclose completed\n");
191 
192  if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
193  drm_irq_uninstall(dev);
194 
195  mutex_lock(&dev->struct_mutex);
196 
197  /* Clear AGP information */
198  if (drm_core_has_AGP(dev) && dev->agp &&
199  !drm_core_check_feature(dev, DRIVER_MODESET)) {
200  struct drm_agp_mem *entry, *tempe;
201 
202  /* Remove AGP resources, but leave dev->agp
203  intact until drv_cleanup is called. */
204  list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
205  if (entry->bound)
206  drm_unbind_agp(entry->memory);
207  drm_free_agp(entry->memory, entry->pages);
208  kfree(entry);
209  }
210  INIT_LIST_HEAD(&dev->agp->memory);
211 
212  if (dev->agp->acquired)
213  drm_agp_release(dev);
214 
215  dev->agp->acquired = 0;
216  dev->agp->enabled = 0;
217  }
218  if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
219  !drm_core_check_feature(dev, DRIVER_MODESET)) {
220  drm_sg_cleanup(dev->sg);
221  dev->sg = NULL;
222  }
223 
224  /* Clear vma list (only built for debugging) */
225  list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
226  list_del(&vma->head);
227  kfree(vma);
228  }
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 
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 
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 
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 
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 
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  DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
397  task_pid_nr(current), cmd, nr,
398  (long)old_encode_dev(file_priv->minor->device),
399  file_priv->authenticated);
400 
401  if ((nr >= DRM_CORE_IOCTL_COUNT) &&
402  ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
403  goto err_i1;
404  if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
405  (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
406  u32 drv_size;
407  ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
408  drv_size = _IOC_SIZE(ioctl->cmd_drv);
409  usize = asize = _IOC_SIZE(cmd);
410  if (drv_size > asize)
411  asize = drv_size;
412  }
413  else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
414  ioctl = &drm_ioctls[nr];
415  cmd = ioctl->cmd;
416  usize = asize = _IOC_SIZE(cmd);
417  } else
418  goto err_i1;
419 
420  /* Do not trust userspace, use our own definition */
421  func = ioctl->func;
422  /* is there a local override? */
423  if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
424  func = dev->driver->dma_ioctl;
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) && !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  retcode = -EACCES;
434  } else {
435  if (cmd & (IOC_IN | IOC_OUT)) {
436  if (asize <= sizeof(stack_kdata)) {
437  kdata = stack_kdata;
438  } else {
439  kdata = kmalloc(asize, GFP_KERNEL);
440  if (!kdata) {
441  retcode = -ENOMEM;
442  goto err_i1;
443  }
444  }
445  if (asize > usize)
446  memset(kdata + usize, 0, asize - usize);
447  }
448 
449  if (cmd & IOC_IN) {
450  if (copy_from_user(kdata, (void __user *)arg,
451  usize) != 0) {
452  retcode = -EFAULT;
453  goto err_i1;
454  }
455  } else
456  memset(kdata, 0, usize);
457 
458  if (ioctl->flags & DRM_UNLOCKED)
459  retcode = func(dev, kdata, file_priv);
460  else {
461  mutex_lock(&drm_global_mutex);
462  retcode = func(dev, kdata, file_priv);
463  mutex_unlock(&drm_global_mutex);
464  }
465 
466  if (cmd & IOC_OUT) {
467  if (copy_to_user((void __user *)arg, kdata,
468  usize) != 0)
469  retcode = -EFAULT;
470  }
471  }
472 
473  err_i1:
474  if (kdata != stack_kdata)
475  kfree(kdata);
476  atomic_dec(&dev->ioctl_count);
477  if (retcode)
478  DRM_DEBUG("ret = %d\n", retcode);
479  return retcode;
480 }
481 
482 EXPORT_SYMBOL(drm_ioctl);
483 
484 struct drm_local_map *drm_getsarea(struct drm_device *dev)
485 {
486  struct drm_map_list *entry;
487 
488  list_for_each_entry(entry, &dev->maplist, head) {
489  if (entry->map && entry->map->type == _DRM_SHM &&
490  (entry->map->flags & _DRM_CONTAINS_LOCK)) {
491  return entry->map;
492  }
493  }
494  return NULL;
495 }
496 EXPORT_SYMBOL(drm_getsarea);
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