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drm: add support for secondary vertical blank interrupt to i915
[linux-2.6-block.git] / drivers / char / drm / drm_drv.c
CommitLineData
1da177e4 1/**
b5e89ed5 2 * \file drm_drv.c
1da177e4
LT		 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 DRIVER_IOCTL_COUNT DRM_ARRAY_SIZE( mga_ioctls )
19 *
20 * #define drm_x mga_##x
21 * \endcode
22 */
23
24/*
25 * Created: Thu Nov 23 03:10:50 2000 by gareth@valinux.com
26 *
27 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
28 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
29 * All Rights Reserved.
30 *
31 * Permission is hereby granted, free of charge, to any person obtaining a
32 * copy of this software and associated documentation files (the "Software"),
33 * to deal in the Software without restriction, including without limitation
34 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
35 * and/or sell copies of the Software, and to permit persons to whom the
36 * Software is furnished to do so, subject to the following conditions:
37 *
38 * The above copyright notice and this permission notice (including the next
39 * paragraph) shall be included in all copies or substantial portions of the
40 * Software.
41 *
42 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
43 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
44 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
45 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
46 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
47 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
48 * OTHER DEALINGS IN THE SOFTWARE.
49 */
50
51#include "drmP.h"
52#include "drm_core.h"
53
c94f7029
DA		 54static int drm_version(struct inode *inode, struct file *filp,
55 unsigned int cmd, unsigned long arg);
56
1da177e4 57/** Ioctl table */
b5e89ed5 58static drm_ioctl_desc_t drm_ioctls[] = {
a7a2cc31
DA		 59 [DRM_IOCTL_NR(DRM_IOCTL_VERSION)] = {drm_version, 0},
60 [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)] = {drm_getunique, 0},
61 [DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)] = {drm_getmagic, 0},
62 [DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)] = {drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY},
63 [DRM_IOCTL_NR(DRM_IOCTL_GET_MAP)] = {drm_getmap, 0},
64 [DRM_IOCTL_NR(DRM_IOCTL_GET_CLIENT)] = {drm_getclient, 0},
65 [DRM_IOCTL_NR(DRM_IOCTL_GET_STATS)] = {drm_getstats, 0},
66 [DRM_IOCTL_NR(DRM_IOCTL_SET_VERSION)] = {drm_setversion, DRM_MASTER|DRM_ROOT_ONLY},
67 [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = {drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
68 [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)] = {drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
69 [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)] = {drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
70 [DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)] = {drm_authmagic, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
71
72 [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)] = {drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
73 [DRM_IOCTL_NR(DRM_IOCTL_RM_MAP)] = {drm_rmmap_ioctl, DRM_AUTH},
74
75 [DRM_IOCTL_NR(DRM_IOCTL_SET_SAREA_CTX)] = {drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
76 [DRM_IOCTL_NR(DRM_IOCTL_GET_SAREA_CTX)] = {drm_getsareactx, DRM_AUTH},
77
11bab7d2
DA		 78 [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)] = {drm_addctx, DRM_AUTH|DRM_ROOT_ONLY},
79 [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)] = {drm_rmctx, DRM_AUTH|DRM_ROOT_ONLY},
a7a2cc31
DA		 80 [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)] = {drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
81 [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)] = {drm_getctx, DRM_AUTH},
82 [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = {drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
83 [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)] = {drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
84 [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)] = {drm_resctx, DRM_AUTH},
85
86 [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)] = {drm_adddraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
87 [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)] = {drm_rmdraw, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
88
89 [DRM_IOCTL_NR(DRM_IOCTL_LOCK)] = {drm_lock, DRM_AUTH},
90 [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)] = {drm_unlock, DRM_AUTH},
91
92 [DRM_IOCTL_NR(DRM_IOCTL_FINISH)] = {drm_noop, DRM_AUTH},
93
94 [DRM_IOCTL_NR(DRM_IOCTL_ADD_BUFS)] = {drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
95 [DRM_IOCTL_NR(DRM_IOCTL_MARK_BUFS)] = {drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
96 [DRM_IOCTL_NR(DRM_IOCTL_INFO_BUFS)] = {drm_infobufs, DRM_AUTH},
97 [DRM_IOCTL_NR(DRM_IOCTL_MAP_BUFS)] = {drm_mapbufs, DRM_AUTH},
98 [DRM_IOCTL_NR(DRM_IOCTL_FREE_BUFS)] = {drm_freebufs, DRM_AUTH},
1da177e4 99 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
a7a2cc31 100 [DRM_IOCTL_NR(DRM_IOCTL_DMA)] = {NULL, DRM_AUTH},
1da177e4 101
a7a2cc31 102 [DRM_IOCTL_NR(DRM_IOCTL_CONTROL)] = {drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
1da177e4
LT		 103
104#if __OS_HAS_AGP
a7a2cc31
DA		 105 [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = {drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
106 [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = {drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
107 [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)] = {drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
108 [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)] = {drm_agp_info_ioctl, DRM_AUTH},
109 [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)] = {drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
110 [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)] = {drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
111 [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)] = {drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
112 [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)] = {drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
1da177e4
LT		 113#endif
114
a7a2cc31
DA		 115 [DRM_IOCTL_NR(DRM_IOCTL_SG_ALLOC)] = {drm_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
116 [DRM_IOCTL_NR(DRM_IOCTL_SG_FREE)] = {drm_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY},
1da177e4 117
a7a2cc31 118 [DRM_IOCTL_NR(DRM_IOCTL_WAIT_VBLANK)] = {drm_wait_vblank, 0},
1da177e4
LT		 119};
120
3d77461e 121#define DRIVER_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
1da177e4
LT		 122
123/**
124 * Take down the DRM device.
125 *
126 * \param dev DRM device structure.
127 *
128 * Frees every resource in \p dev.
129 *
aff138ab 130 * \sa drm_device
1da177e4 131 */
22eae947 132int drm_lastclose(drm_device_t * dev)
1da177e4
LT		 133{
134 drm_magic_entry_t *pt, *next;
1da177e4 135 drm_map_list_t *r_list;
1da177e4
LT		 136 drm_vma_entry_t *vma, *vma_next;
137 int i;
138
b5e89ed5 139 DRM_DEBUG("\n");
1da177e4 140
22eae947
DA		 141 if (dev->driver->lastclose)
142 dev->driver->lastclose(dev);
143 DRM_DEBUG("driver lastclose completed\n");
1da177e4
LT		 144
145 if (dev->unique) {
146 drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
147 dev->unique = NULL;
148 dev->unique_len = 0;
149 }
150
b5e89ed5
DA		 151 if (dev->irq_enabled)
152 drm_irq_uninstall(dev);
1da177e4 153
30e2fb18 154 mutex_lock(&dev->struct_mutex);
b5e89ed5 155 del_timer(&dev->timer);
1da177e4 156
b5e89ed5 157 /* Clear pid list */
0a0c721d
TH		 158 if (dev->magicfree.next) {
159 list_for_each_entry_safe(pt, next, &dev->magicfree, head) {
160 list_del(&pt->head);
161 drm_ht_remove_item(&dev->magiclist, &pt->hash_item);
162 drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
163 }
1f4eccfd 164 drm_ht_remove(&dev->magiclist);
1da177e4
LT		 165 }
166
b5e89ed5 167 /* Clear AGP information */
1da177e4
LT		 168 if (drm_core_has_AGP(dev) && dev->agp) {
169 drm_agp_mem_t *entry;
170 drm_agp_mem_t *nexte;
171
b5e89ed5
DA		 172 /* Remove AGP resources, but leave dev->agp
173 intact until drv_cleanup is called. */
174 for (entry = dev->agp->memory; entry; entry = nexte) {
1da177e4 175 nexte = entry->next;
b5e89ed5
DA		 176 if (entry->bound)
177 drm_unbind_agp(entry->memory);
178 drm_free_agp(entry->memory, entry->pages);
179 drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
1da177e4
LT		 180 }
181 dev->agp->memory = NULL;
182
7ab98401 183 if (dev->agp->acquired)
b5e89ed5 184 drm_agp_release(dev);
1da177e4
LT		 185
186 dev->agp->acquired = 0;
b5e89ed5 187 dev->agp->enabled = 0;
1da177e4 188 }
836cf046
DA		 189 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg) {
190 drm_sg_cleanup(dev->sg);
191 dev->sg = NULL;
192 }
1da177e4 193
b5e89ed5
DA		 194 /* Clear vma list (only built for debugging) */
195 if (dev->vmalist) {
196 for (vma = dev->vmalist; vma; vma = vma_next) {
1da177e4 197 vma_next = vma->next;
b5e89ed5 198 drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
1da177e4
LT		 199 }
200 dev->vmalist = NULL;
201 }
202
b5e89ed5 203 if (dev->maplist) {
836cf046
DA		 204 while (!list_empty(&dev->maplist->head)) {
205 struct list_head *list = dev->maplist->head.next;
206 r_list = list_entry(list, drm_map_list_t, head);
207 drm_rmmap_locked(dev, r_list->map);
208 }
b5e89ed5
DA		 209 }
210
211 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
212 for (i = 0; i < dev->queue_count; i++) {
213 if (dev->queuelist[i]) {
214 drm_free(dev->queuelist[i],
215 sizeof(*dev->queuelist[0]),
216 DRM_MEM_QUEUES);
1da177e4
LT		 217 dev->queuelist[i] = NULL;
218 }
219 }
b5e89ed5
DA		 220 drm_free(dev->queuelist,
221 dev->queue_slots * sizeof(*dev->queuelist),
222 DRM_MEM_QUEUES);
1da177e4
LT		 223 dev->queuelist = NULL;
224 }
225 dev->queue_count = 0;
226
227 if (drm_core_check_feature(dev, DRIVER_HAVE_DMA))
b5e89ed5 228 drm_dma_takedown(dev);
1da177e4 229
b5e89ed5
DA		 230 if (dev->lock.hw_lock) {
231 dev->sigdata.lock = dev->lock.hw_lock = NULL; /* SHM removed */
1da177e4 232 dev->lock.filp = NULL;
b5e89ed5 233 wake_up_interruptible(&dev->lock.lock_queue);
1da177e4 234 }
30e2fb18 235 mutex_unlock(&dev->struct_mutex);
1da177e4 236
22eae947 237 DRM_DEBUG("lastclose completed\n");
1da177e4
LT		 238 return 0;
239}
240
1da177e4
LT		 241/**
242 * Module initialization. Called via init_module at module load time, or via
243 * linux/init/main.c (this is not currently supported).
244 *
245 * \return zero on success or a negative number on failure.
246 *
247 * Initializes an array of drm_device structures, and attempts to
248 * initialize all available devices, using consecutive minors, registering the
249 * stubs and initializing the AGP device.
b5e89ed5 250 *
1da177e4
LT		 251 * Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
252 * after the initialization for driver customization.
253 */
b5e89ed5 254int drm_init(struct drm_driver *driver)
1da177e4
LT		 255{
256 struct pci_dev *pdev = NULL;
257 struct pci_device_id *pid;
258 int i;
259
b5e89ed5 260 DRM_DEBUG("\n");
1da177e4
LT		 261
262 drm_mem_init();
263
b5e89ed5 264 for (i = 0; driver->pci_driver.id_table[i].vendor != 0; i++) {
1da177e4 265 pid = (struct pci_device_id *)&driver->pci_driver.id_table[i];
b5e89ed5
DA		 266
267 pdev = NULL;
268 /* pass back in pdev to account for multiple identical cards */
269 while ((pdev =
270 pci_get_subsys(pid->vendor, pid->device, pid->subvendor,
271 pid->subdevice, pdev)) != NULL) {
1da177e4
LT		 272 /* stealth mode requires a manual probe */
273 pci_dev_get(pdev);
274 drm_get_dev(pdev, pid, driver);
275 }
276 }
277 return 0;
278}
b5e89ed5 279
1da177e4
LT		 280EXPORT_SYMBOL(drm_init);
281
282/**
283 * Called via cleanup_module() at module unload time.
284 *
22eae947 285 * Cleans up all DRM device, calling drm_lastclose().
b5e89ed5 286 *
aff138ab 287 * \sa drm_init
1da177e4 288 */
b5e89ed5 289static void drm_cleanup(drm_device_t * dev)
1da177e4 290{
b5e89ed5 291 DRM_DEBUG("\n");
1da177e4
LT		 292
293 if (!dev) {
294 DRM_ERROR("cleanup called no dev\n");
295 return;
296 }
297
22eae947 298 drm_lastclose(dev);
1da177e4 299
836cf046
DA		 300 if (dev->maplist) {
301 drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
302 dev->maplist = NULL;
1f4eccfd 303 drm_ht_remove(&dev->map_hash);
836cf046
DA		 304 }
305
b5e89ed5
DA		 306 drm_ctxbitmap_cleanup(dev);
307
1da177e4
LT		 308 if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
309 dev->agp && dev->agp->agp_mtrr >= 0) {
310 int retval;
b5e89ed5
DA		 311 retval = mtrr_del(dev->agp->agp_mtrr,
312 dev->agp->agp_info.aper_base,
313 dev->agp->agp_info.aper_size * 1024 * 1024);
314 DRM_DEBUG("mtrr_del=%d\n", retval);
1da177e4 315 }
b5e89ed5
DA		 316
317 if (drm_core_has_AGP(dev) && dev->agp) {
318 drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
1da177e4
LT		 319 dev->agp = NULL;
320 }
321
22eae947
DA		 322 if (dev->driver->unload)
323 dev->driver->unload(dev);
b5e89ed5 324
1da177e4 325 drm_put_head(&dev->primary);
b5e89ed5
DA		 326 if (drm_put_dev(dev))
327 DRM_ERROR("Cannot unload module\n");
1da177e4
LT		 328}
329
b5e89ed5 330void drm_exit(struct drm_driver *driver)
1da177e4
LT		 331{
332 int i;
333 drm_device_t *dev = NULL;
334 drm_head_t *head;
b5e89ed5
DA		 335
336 DRM_DEBUG("\n");
1da177e4
LT		 337
338 for (i = 0; i < drm_cards_limit; i++) {
339 head = drm_heads[i];
340 if (!head)
341 continue;
342 if (!head->dev)
343 continue;
b5e89ed5 344 if (head->dev->driver != driver)
1da177e4 345 continue;
b5e89ed5 346 dev = head->dev;
aab8df14
DA		 347 if (dev) {
348 /* release the pci driver */
349 if (dev->pdev)
350 pci_dev_put(dev->pdev);
351 drm_cleanup(dev);
352 }
1da177e4 353 }
b5e89ed5 354 DRM_INFO("Module unloaded\n");
1da177e4 355}
b5e89ed5 356
1da177e4
LT		 357EXPORT_SYMBOL(drm_exit);
358
359/** File operations structure */
360static struct file_operations drm_stub_fops = {
361 .owner = THIS_MODULE,
b5e89ed5 362 .open = drm_stub_open
1da177e4
LT		 363};
364
365static int __init drm_core_init(void)
366{
367 int ret = -ENOMEM;
b5e89ed5
DA		 368
369 drm_cards_limit =
370 (drm_cards_limit <
371 DRM_MAX_MINOR + 1 ? drm_cards_limit : DRM_MAX_MINOR + 1);
372 drm_heads =
373 drm_calloc(drm_cards_limit, sizeof(*drm_heads), DRM_MEM_STUB);
374 if (!drm_heads)
1da177e4 375 goto err_p1;
b5e89ed5 376
1da177e4
LT		 377 if (register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops))
378 goto err_p1;
b5e89ed5 379
1da177e4
LT		 380 drm_class = drm_sysfs_create(THIS_MODULE, "drm");
381 if (IS_ERR(drm_class)) {
b5e89ed5 382 printk(KERN_ERR "DRM: Error creating drm class.\n");
1da177e4
LT		 383 ret = PTR_ERR(drm_class);
384 goto err_p2;
385 }
386
66600221 387 drm_proc_root = proc_mkdir("dri", NULL);
1da177e4
LT		 388 if (!drm_proc_root) {
389 DRM_ERROR("Cannot create /proc/dri\n");
390 ret = -1;
391 goto err_p3;
392 }
b5e89ed5
DA		 393
394 DRM_INFO("Initialized %s %d.%d.%d %s\n",
395 CORE_NAME, CORE_MAJOR, CORE_MINOR, CORE_PATCHLEVEL, CORE_DATE);
1da177e4 396 return 0;
b5e89ed5 397 err_p3:
1da177e4 398 drm_sysfs_destroy(drm_class);
b5e89ed5 399 err_p2:
1da177e4
LT		 400 unregister_chrdev(DRM_MAJOR, "drm");
401 drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
b5e89ed5 402 err_p1:
1da177e4
LT		 403 return ret;
404}
405
b5e89ed5 406static void __exit drm_core_exit(void)
1da177e4
LT		 407{
408 remove_proc_entry("dri", NULL);
409 drm_sysfs_destroy(drm_class);
410
411 unregister_chrdev(DRM_MAJOR, "drm");
412
b5e89ed5 413 drm_free(drm_heads, sizeof(*drm_heads) * drm_cards_limit, DRM_MEM_STUB);
1da177e4
LT		 414}
415
b5e89ed5
DA		 416module_init(drm_core_init);
417module_exit(drm_core_exit);
1da177e4
LT		 418
419/**
420 * Get version information
421 *
422 * \param inode device inode.
423 * \param filp file pointer.
424 * \param cmd command.
425 * \param arg user argument, pointing to a drm_version structure.
426 * \return zero on success or negative number on failure.
427 *
428 * Fills in the version information in \p arg.
429 */
b5e89ed5
DA		 430static int drm_version(struct inode *inode, struct file *filp,
431 unsigned int cmd, unsigned long arg)
1da177e4
LT		 432{
433 drm_file_t *priv = filp->private_data;
434 drm_device_t *dev = priv->head->dev;
435 drm_version_t __user *argp = (void __user *)arg;
436 drm_version_t version;
22eae947 437 int len;
1da177e4 438
b5e89ed5 439 if (copy_from_user(&version, argp, sizeof(version)))
1da177e4
LT		 440 return -EFAULT;
441
22eae947
DA		 442 version.version_major = dev->driver->major;
443 version.version_minor = dev->driver->minor;
444 version.version_patchlevel = dev->driver->patchlevel;
445 DRM_COPY(version.name, dev->driver->name);
446 DRM_COPY(version.date, dev->driver->date);
447 DRM_COPY(version.desc, dev->driver->desc);
b5e89ed5
DA		 448
449 if (copy_to_user(argp, &version, sizeof(version)))
1da177e4
LT		 450 return -EFAULT;
451 return 0;
452}
453
b5e89ed5 454/**
1da177e4
LT		 455 * Called whenever a process performs an ioctl on /dev/drm.
456 *
457 * \param inode device inode.
458 * \param filp file pointer.
459 * \param cmd command.
460 * \param arg user argument.
461 * \return zero on success or negative number on failure.
462 *
463 * Looks up the ioctl function in the ::ioctls table, checking for root
464 * previleges if so required, and dispatches to the respective function.
465 */
b5e89ed5
DA		 466int drm_ioctl(struct inode *inode, struct file *filp,
467 unsigned int cmd, unsigned long arg)
1da177e4
LT		 468{
469 drm_file_t *priv = filp->private_data;
470 drm_device_t *dev = priv->head->dev;
471 drm_ioctl_desc_t *ioctl;
472 drm_ioctl_t *func;
473 unsigned int nr = DRM_IOCTL_NR(cmd);
474 int retcode = -EINVAL;
475
b5e89ed5
DA		 476 atomic_inc(&dev->ioctl_count);
477 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
1da177e4
LT		 478 ++priv->ioctl_count;
479
b5e89ed5
DA		 480 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
481 current->pid, cmd, nr,
482 (long)old_encode_dev(priv->head->device),
483 priv->authenticated);
484
1da177e4
LT		 485 if (nr < DRIVER_IOCTL_COUNT)
486 ioctl = &drm_ioctls[nr];
b5e89ed5
DA		 487 else if ((nr >= DRM_COMMAND_BASE)
488 && (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls))
1da177e4
LT		 489 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
490 else
491 goto err_i1;
b5e89ed5 492
1da177e4
LT		 493 func = ioctl->func;
494 /* is there a local override? */
495 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
496 func = dev->driver->dma_ioctl;
b5e89ed5
DA		 497
498 if (!func) {
499 DRM_DEBUG("no function\n");
1da177e4 500 retcode = -EINVAL;
a7a2cc31
DA		 501 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
502 ((ioctl->flags & DRM_AUTH) && !priv->authenticated) ||
503 ((ioctl->flags & DRM_MASTER) && !priv->master)) {
1da177e4
LT		 504 retcode = -EACCES;
505 } else {
b5e89ed5 506 retcode = func(inode, filp, cmd, arg);
1da177e4 507 }
b5e89ed5
DA		 508
509 err_i1:
510 atomic_dec(&dev->ioctl_count);
511 if (retcode)
512 DRM_DEBUG("ret = %x\n", retcode);
1da177e4
LT		 513 return retcode;
514}
1da177e4 515
b5e89ed5 516EXPORT_SYMBOL(drm_ioctl);
Linux 6.x block layer and io_uring tree(s)