Linux/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 "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, 0),
 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, 0),
 69         DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
 70         DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
 71         DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, 0),
 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_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
139         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
140         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
141         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
142         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER|DRM_UNLOCKED),
143         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
144         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
145         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
146         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
147         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
148         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED),
149         DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
150         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
151         DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
152         DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
153         DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
154         DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
155         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
156         DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
157         DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
158         DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED)
159 };
160 
161 #define DRM_CORE_IOCTL_COUNT    ARRAY_SIZE( drm_ioctls )
162 
163 /**
164  * Take down the DRM device.
165  *
166  * \param dev DRM device structure.
167  *
168  * Frees every resource in \p dev.
169  *
170  * \sa drm_device
171  */
172 int drm_lastclose(struct drm_device * dev)
173 {
174         struct drm_vma_entry *vma, *vma_temp;
175         int i;
176 
177         DRM_DEBUG("\n");
178 
179         if (dev->driver->lastclose)
180                 dev->driver->lastclose(dev);
181         DRM_DEBUG("driver lastclose completed\n");
182 
183         if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
184                 drm_irq_uninstall(dev);
185 
186         mutex_lock(&dev->struct_mutex);
187 
188         /* Clear AGP information */
189         if (drm_core_has_AGP(dev) && dev->agp &&
190                         !drm_core_check_feature(dev, DRIVER_MODESET)) {
191                 struct drm_agp_mem *entry, *tempe;
192 
193                 /* Remove AGP resources, but leave dev->agp
194                    intact until drv_cleanup is called. */
195                 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
196                         if (entry->bound)
197                                 drm_unbind_agp(entry->memory);
198                         drm_free_agp(entry->memory, entry->pages);
199                         kfree(entry);
200                 }
201                 INIT_LIST_HEAD(&dev->agp->memory);
202 
203                 if (dev->agp->acquired)
204                         drm_agp_release(dev);
205 
206                 dev->agp->acquired = 0;
207                 dev->agp->enabled = 0;
208         }
209         if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
210             !drm_core_check_feature(dev, DRIVER_MODESET)) {
211                 drm_sg_cleanup(dev->sg);
212                 dev->sg = NULL;
213         }
214 
215         /* Clear vma list (only built for debugging) */
216         list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
217                 list_del(&vma->head);
218                 kfree(vma);
219         }
220 
221         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
222                 for (i = 0; i < dev->queue_count; i++) {
223                         kfree(dev->queuelist[i]);
224                         dev->queuelist[i] = NULL;
225                 }
226                 kfree(dev->queuelist);
227                 dev->queuelist = NULL;
228         }
229         dev->queue_count = 0;
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_remove_all(&drm_minors_idr);
302         idr_destroy(&drm_minors_idr);
303 }
304 
305 module_init(drm_core_init);
306 module_exit(drm_core_exit);
307 
308 /**
309  * Copy and IOCTL return string to user space
310  */
311 static int drm_copy_field(char *buf, size_t *buf_len, const char *value)
312 {
313         int len;
314 
315         /* don't overflow userbuf */
316         len = strlen(value);
317         if (len > *buf_len)
318                 len = *buf_len;
319 
320         /* let userspace know exact length of driver value (which could be
321          * larger than the userspace-supplied buffer) */
322         *buf_len = strlen(value);
323 
324         /* finally, try filling in the userbuf */
325         if (len && buf)
326                 if (copy_to_user(buf, value, len))
327                         return -EFAULT;
328         return 0;
329 }
330 
331 /**
332  * Get version information
333  *
334  * \param inode device inode.
335  * \param filp file pointer.
336  * \param cmd command.
337  * \param arg user argument, pointing to a drm_version structure.
338  * \return zero on success or negative number on failure.
339  *
340  * Fills in the version information in \p arg.
341  */
342 static int drm_version(struct drm_device *dev, void *data,
343                        struct drm_file *file_priv)
344 {
345         struct drm_version *version = data;
346         int err;
347 
348         version->version_major = dev->driver->major;
349         version->version_minor = dev->driver->minor;
350         version->version_patchlevel = dev->driver->patchlevel;
351         err = drm_copy_field(version->name, &version->name_len,
352                         dev->driver->name);
353         if (!err)
354                 err = drm_copy_field(version->date, &version->date_len,
355                                 dev->driver->date);
356         if (!err)
357                 err = drm_copy_field(version->desc, &version->desc_len,
358                                 dev->driver->desc);
359 
360         return err;
361 }
362 
363 /**
364  * Called whenever a process performs an ioctl on /dev/drm.
365  *
366  * \param inode device inode.
367  * \param file_priv DRM file private.
368  * \param cmd command.
369  * \param arg user argument.
370  * \return zero on success or negative number on failure.
371  *
372  * Looks up the ioctl function in the ::ioctls table, checking for root
373  * previleges if so required, and dispatches to the respective function.
374  */
375 long drm_ioctl(struct file *filp,
376               unsigned int cmd, unsigned long arg)
377 {
378         struct drm_file *file_priv = filp->private_data;
379         struct drm_device *dev;
380         struct drm_ioctl_desc *ioctl;
381         drm_ioctl_t *func;
382         unsigned int nr = DRM_IOCTL_NR(cmd);
383         int retcode = -EINVAL;
384         char stack_kdata[128];
385         char *kdata = NULL;
386         unsigned int usize, asize;
387 
388         dev = file_priv->minor->dev;
389         atomic_inc(&dev->ioctl_count);
390         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
391         ++file_priv->ioctl_count;
392 
393         DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
394                   task_pid_nr(current), cmd, nr,
395                   (long)old_encode_dev(file_priv->minor->device),
396                   file_priv->authenticated);
397 
398         if ((nr >= DRM_CORE_IOCTL_COUNT) &&
399             ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
400                 goto err_i1;
401         if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
402             (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
403                 u32 drv_size;
404                 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
405                 drv_size = _IOC_SIZE(ioctl->cmd_drv);
406                 usize = asize = _IOC_SIZE(cmd);
407                 if (drv_size > asize)
408                         asize = drv_size;
409         }
410         else if ((nr >= DRM_COMMAND_END) || (nr < DRM_COMMAND_BASE)) {
411                 ioctl = &drm_ioctls[nr];
412                 cmd = ioctl->cmd;
413                 usize = asize = _IOC_SIZE(cmd);
414         } else
415                 goto err_i1;
416 
417         /* Do not trust userspace, use our own definition */
418         func = ioctl->func;
419         /* is there a local override? */
420         if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
421                 func = dev->driver->dma_ioctl;
422 
423         if (!func) {
424                 DRM_DEBUG("no function\n");
425                 retcode = -EINVAL;
426         } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
427                    ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
428                    ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
429                    (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
430                 retcode = -EACCES;
431         } else {
432                 if (cmd & (IOC_IN | IOC_OUT)) {
433                         if (asize <= sizeof(stack_kdata)) {
434                                 kdata = stack_kdata;
435                         } else {
436                                 kdata = kmalloc(asize, GFP_KERNEL);
437                                 if (!kdata) {
438                                         retcode = -ENOMEM;
439                                         goto err_i1;
440                                 }
441                         }
442                         if (asize > usize)
443                                 memset(kdata + usize, 0, asize - usize);
444                 }
445 
446                 if (cmd & IOC_IN) {
447                         if (copy_from_user(kdata, (void __user *)arg,
448                                            usize) != 0) {
449                                 retcode = -EFAULT;
450                                 goto err_i1;
451                         }
452                 } else
453                         memset(kdata, 0, usize);
454 
455                 if (ioctl->flags & DRM_UNLOCKED)
456                         retcode = func(dev, kdata, file_priv);
457                 else {
458                         mutex_lock(&drm_global_mutex);
459                         retcode = func(dev, kdata, file_priv);
460                         mutex_unlock(&drm_global_mutex);
461                 }
462 
463                 if (cmd & IOC_OUT) {
464                         if (copy_to_user((void __user *)arg, kdata,
465                                          usize) != 0)
466                                 retcode = -EFAULT;
467                 }
468         }
469 
470       err_i1:
471         if (kdata != stack_kdata)
472                 kfree(kdata);
473         atomic_dec(&dev->ioctl_count);
474         if (retcode)
475                 DRM_DEBUG("ret = %x\n", retcode);
476         return retcode;
477 }
478 
479 EXPORT_SYMBOL(drm_ioctl);
480 
481 struct drm_local_map *drm_getsarea(struct drm_device *dev)
482 {
483         struct drm_map_list *entry;
484 
485         list_for_each_entry(entry, &dev->maplist, head) {
486                 if (entry->map && entry->map->type == _DRM_SHM &&
487                     (entry->map->flags & _DRM_CONTAINS_LOCK)) {
488                         return entry->map;
489                 }
490         }
491         return NULL;
492 }
493 EXPORT_SYMBOL(drm_getsarea);
494 

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