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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 "drmP.h"
52#include "drm_core.h"
53
54
55static int drm_version(struct drm_device *dev, void *data,
56 struct drm_file *file_priv);
57
58#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
59 [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0}
60
61/** Ioctl table */
62static struct drm_ioctl_desc drm_ioctls[] = {
63 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, 0),
64 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
65 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
66 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
67 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, 0),
68 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
69 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
70 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, 0),
71 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
72
73 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
74 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
75 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
76 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
77
78 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
79 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_rmmap_ioctl, DRM_AUTH),
80
81 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
82 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_getsareactx, DRM_AUTH),
83
84 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
85 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
86
87 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_addctx, DRM_AUTH|DRM_ROOT_ONLY),
88 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
89 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_modctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
90 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_getctx, DRM_AUTH),
91 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
92 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
93 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_resctx, DRM_AUTH),
94
95 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
96 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
97
98 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
99 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_unlock, DRM_AUTH),
100
101 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
102
103 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
104 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
105 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_infobufs, DRM_AUTH),
106 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_mapbufs, DRM_AUTH),
107 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_freebufs, DRM_AUTH),
108 /* The DRM_IOCTL_DMA ioctl should be defined by the driver. */
109 DRM_IOCTL_DEF(DRM_IOCTL_DMA, NULL, 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_ioctl, 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, 0),
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),
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_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
138 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
139 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
140 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
141 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_MASTER|DRM_UNLOCKED),
142 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
143 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
144 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
145 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_mode_attachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
146 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_mode_detachmode_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
147 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_MASTER | DRM_CONTROL_ALLOW|DRM_UNLOCKED),
148 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
149 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
150 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
151 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
152 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
153 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
154 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
155 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
156 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
157 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED)
158};
159
160#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
161
162/**
163 * Take down the DRM device.
164 *
165 * \param dev DRM device structure.
166 *
167 * Frees every resource in \p dev.
168 *
169 * \sa drm_device
170 */
171int drm_lastclose(struct drm_device * dev)
172{
173 struct drm_vma_entry *vma, *vma_temp;
174 int i;
175
176 DRM_DEBUG("\n");
177
178 if (dev->driver->lastclose)
179 dev->driver->lastclose(dev);
180 DRM_DEBUG("driver lastclose completed\n");
181
182 if (dev->irq_enabled && !drm_core_check_feature(dev, DRIVER_MODESET))
183 drm_irq_uninstall(dev);
184
185 mutex_lock(&dev->struct_mutex);
186
187 /* Clear AGP information */
188 if (drm_core_has_AGP(dev) && dev->agp &&
189 !drm_core_check_feature(dev, DRIVER_MODESET)) {
190 struct drm_agp_mem *entry, *tempe;
191
192 /* Remove AGP resources, but leave dev->agp
193 intact until drv_cleanup is called. */
194 list_for_each_entry_safe(entry, tempe, &dev->agp->memory, head) {
195 if (entry->bound)
196 drm_unbind_agp(entry->memory);
197 drm_free_agp(entry->memory, entry->pages);
198 kfree(entry);
199 }
200 INIT_LIST_HEAD(&dev->agp->memory);
201
202 if (dev->agp->acquired)
203 drm_agp_release(dev);
204
205 dev->agp->acquired = 0;
206 dev->agp->enabled = 0;
207 }
208 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
209 !drm_core_check_feature(dev, DRIVER_MODESET)) {
210 drm_sg_cleanup(dev->sg);
211 dev->sg = NULL;
212 }
213
214 /* Clear vma list (only built for debugging) */
215 list_for_each_entry_safe(vma, vma_temp, &dev->vmalist, head) {
216 list_del(&vma->head);
217 kfree(vma);
218 }
219
220 if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && dev->queuelist) {
221 for (i = 0; i < dev->queue_count; i++) {
222 kfree(dev->queuelist[i]);
223 dev->queuelist[i] = NULL;
224 }
225 kfree(dev->queuelist);
226 dev->queuelist = NULL;
227 }
228 dev->queue_count = 0;
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
241/** File operations structure */
242static const struct file_operations drm_stub_fops = {
243 .owner = THIS_MODULE,
244 .open = drm_stub_open,
245 .llseek = noop_llseek,
246};
247
248static 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;
282err_p3:
283 drm_sysfs_destroy();
284err_p2:
285 unregister_chrdev(DRM_MAJOR, "drm");
286
287 idr_destroy(&drm_minors_idr);
288err_p1:
289 return ret;
290}
291
292static 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
304module_init(drm_core_init);
305module_exit(drm_core_exit);
306
307/**
308 * Copy and IOCTL return string to user space
309 */
310static 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 */
341static 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 */
374long 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 atomic_inc(&dev->ioctl_count);
389 atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
390 ++file_priv->ioctl_count;
391
392 DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
393 task_pid_nr(current), cmd, nr,
394 (long)old_encode_dev(file_priv->minor->device),
395 file_priv->authenticated);
396
397 if ((nr >= DRM_CORE_IOCTL_COUNT) &&
398 ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
399 goto err_i1;
400 if ((nr >= DRM_COMMAND_BASE) && (nr < DRM_COMMAND_END) &&
401 (nr < DRM_COMMAND_BASE + dev->driver->num_ioctls)) {
402 u32 drv_size;
403 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
404 drv_size = _IOC_SIZE(ioctl->cmd_drv);
405 usize = asize = _IOC_SIZE(cmd);
406 if (drv_size > asize)
407 asize = drv_size;
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 /* Do not trust userspace, use our own definition */
417 func = ioctl->func;
418 /* is there a local override? */
419 if ((nr == DRM_IOCTL_NR(DRM_IOCTL_DMA)) && dev->driver->dma_ioctl)
420 func = dev->driver->dma_ioctl;
421
422 if (!func) {
423 DRM_DEBUG("no function\n");
424 retcode = -EINVAL;
425 } else if (((ioctl->flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)) ||
426 ((ioctl->flags & DRM_AUTH) && !file_priv->authenticated) ||
427 ((ioctl->flags & DRM_MASTER) && !file_priv->is_master) ||
428 (!(ioctl->flags & DRM_CONTROL_ALLOW) && (file_priv->minor->type == DRM_MINOR_CONTROL))) {
429 retcode = -EACCES;
430 } else {
431 if (cmd & (IOC_IN | IOC_OUT)) {
432 if (asize <= sizeof(stack_kdata)) {
433 kdata = stack_kdata;
434 } else {
435 kdata = kmalloc(asize, GFP_KERNEL);
436 if (!kdata) {
437 retcode = -ENOMEM;
438 goto err_i1;
439 }
440 }
441 }
442
443 if (cmd & IOC_IN) {
444 if (copy_from_user(kdata, (void __user *)arg,
445 usize) != 0) {
446 retcode = -EFAULT;
447 goto err_i1;
448 }
449 } else
450 memset(kdata, 0, usize);
451
452 if (ioctl->flags & DRM_UNLOCKED)
453 retcode = func(dev, kdata, file_priv);
454 else {
455 mutex_lock(&drm_global_mutex);
456 retcode = func(dev, kdata, file_priv);
457 mutex_unlock(&drm_global_mutex);
458 }
459
460 if (cmd & IOC_OUT) {
461 if (copy_to_user((void __user *)arg, kdata,
462 usize) != 0)
463 retcode = -EFAULT;
464 }
465 }
466
467 err_i1:
468 if (kdata != stack_kdata)
469 kfree(kdata);
470 atomic_dec(&dev->ioctl_count);
471 if (retcode)
472 DRM_DEBUG("ret = %x\n", retcode);
473 return retcode;
474}
475
476EXPORT_SYMBOL(drm_ioctl);
477
478struct drm_local_map *drm_getsarea(struct drm_device *dev)
479{
480 struct drm_map_list *entry;
481
482 list_for_each_entry(entry, &dev->maplist, head) {
483 if (entry->map && entry->map->type == _DRM_SHM &&
484 (entry->map->flags & _DRM_CONTAINS_LOCK)) {
485 return entry->map;
486 }
487 }
488 return NULL;
489}
490EXPORT_SYMBOL(drm_getsarea);
1/*
2 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
3 *
4 * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California.
5 * All Rights Reserved.
6 *
7 * Author Rickard E. (Rik) Faith <faith@valinux.com>
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice (including the next
17 * paragraph) shall be included in all copies or substantial portions of the
18 * Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
24 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 * DEALINGS IN THE SOFTWARE.
27 */
28
29#include <linux/debugfs.h>
30#include <linux/fs.h>
31#include <linux/module.h>
32#include <linux/moduleparam.h>
33#include <linux/mount.h>
34#include <linux/slab.h>
35
36#include <drm/drm_drv.h>
37#include <drm/drmP.h>
38
39#include "drm_crtc_internal.h"
40#include "drm_legacy.h"
41#include "drm_internal.h"
42#include "drm_crtc_internal.h"
43
44/*
45 * drm_debug: Enable debug output.
46 * Bitmask of DRM_UT_x. See include/drm/drmP.h for details.
47 */
48unsigned int drm_debug = 0;
49EXPORT_SYMBOL(drm_debug);
50
51MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl");
52MODULE_DESCRIPTION("DRM shared core routines");
53MODULE_LICENSE("GPL and additional rights");
54MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n"
55"\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n"
56"\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n"
57"\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n"
58"\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n"
59"\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n"
60"\t\tBit 5 (0x20) will enable VBL messages (vblank code)");
61module_param_named(debug, drm_debug, int, 0600);
62
63static DEFINE_SPINLOCK(drm_minor_lock);
64static struct idr drm_minors_idr;
65
66static struct dentry *drm_debugfs_root;
67
68#define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV"
69
70void drm_dev_printk(const struct device *dev, const char *level,
71 unsigned int category, const char *function_name,
72 const char *prefix, const char *format, ...)
73{
74 struct va_format vaf;
75 va_list args;
76
77 if (category != DRM_UT_NONE && !(drm_debug & category))
78 return;
79
80 va_start(args, format);
81 vaf.fmt = format;
82 vaf.va = &args;
83
84 if (dev)
85 dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix,
86 &vaf);
87 else
88 printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf);
89
90 va_end(args);
91}
92EXPORT_SYMBOL(drm_dev_printk);
93
94void drm_printk(const char *level, unsigned int category,
95 const char *format, ...)
96{
97 struct va_format vaf;
98 va_list args;
99
100 if (category != DRM_UT_NONE && !(drm_debug & category))
101 return;
102
103 va_start(args, format);
104 vaf.fmt = format;
105 vaf.va = &args;
106
107 printk("%s" "[" DRM_NAME ":%ps]%s %pV",
108 level, __builtin_return_address(0),
109 strcmp(level, KERN_ERR) == 0 ? " *ERROR*" : "", &vaf);
110
111 va_end(args);
112}
113EXPORT_SYMBOL(drm_printk);
114
115/*
116 * DRM Minors
117 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
118 * of them is represented by a drm_minor object. Depending on the capabilities
119 * of the device-driver, different interfaces are registered.
120 *
121 * Minors can be accessed via dev->$minor_name. This pointer is either
122 * NULL or a valid drm_minor pointer and stays valid as long as the device is
123 * valid. This means, DRM minors have the same life-time as the underlying
124 * device. However, this doesn't mean that the minor is active. Minors are
125 * registered and unregistered dynamically according to device-state.
126 */
127
128static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
129 unsigned int type)
130{
131 switch (type) {
132 case DRM_MINOR_PRIMARY:
133 return &dev->primary;
134 case DRM_MINOR_RENDER:
135 return &dev->render;
136 case DRM_MINOR_CONTROL:
137 return &dev->control;
138 default:
139 return NULL;
140 }
141}
142
143static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
144{
145 struct drm_minor *minor;
146 unsigned long flags;
147 int r;
148
149 minor = kzalloc(sizeof(*minor), GFP_KERNEL);
150 if (!minor)
151 return -ENOMEM;
152
153 minor->type = type;
154 minor->dev = dev;
155
156 idr_preload(GFP_KERNEL);
157 spin_lock_irqsave(&drm_minor_lock, flags);
158 r = idr_alloc(&drm_minors_idr,
159 NULL,
160 64 * type,
161 64 * (type + 1),
162 GFP_NOWAIT);
163 spin_unlock_irqrestore(&drm_minor_lock, flags);
164 idr_preload_end();
165
166 if (r < 0)
167 goto err_free;
168
169 minor->index = r;
170
171 minor->kdev = drm_sysfs_minor_alloc(minor);
172 if (IS_ERR(minor->kdev)) {
173 r = PTR_ERR(minor->kdev);
174 goto err_index;
175 }
176
177 *drm_minor_get_slot(dev, type) = minor;
178 return 0;
179
180err_index:
181 spin_lock_irqsave(&drm_minor_lock, flags);
182 idr_remove(&drm_minors_idr, minor->index);
183 spin_unlock_irqrestore(&drm_minor_lock, flags);
184err_free:
185 kfree(minor);
186 return r;
187}
188
189static void drm_minor_free(struct drm_device *dev, unsigned int type)
190{
191 struct drm_minor **slot, *minor;
192 unsigned long flags;
193
194 slot = drm_minor_get_slot(dev, type);
195 minor = *slot;
196 if (!minor)
197 return;
198
199 put_device(minor->kdev);
200
201 spin_lock_irqsave(&drm_minor_lock, flags);
202 idr_remove(&drm_minors_idr, minor->index);
203 spin_unlock_irqrestore(&drm_minor_lock, flags);
204
205 kfree(minor);
206 *slot = NULL;
207}
208
209static int drm_minor_register(struct drm_device *dev, unsigned int type)
210{
211 struct drm_minor *minor;
212 unsigned long flags;
213 int ret;
214
215 DRM_DEBUG("\n");
216
217 minor = *drm_minor_get_slot(dev, type);
218 if (!minor)
219 return 0;
220
221 ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
222 if (ret) {
223 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
224 return ret;
225 }
226
227 ret = device_add(minor->kdev);
228 if (ret)
229 goto err_debugfs;
230
231 /* replace NULL with @minor so lookups will succeed from now on */
232 spin_lock_irqsave(&drm_minor_lock, flags);
233 idr_replace(&drm_minors_idr, minor, minor->index);
234 spin_unlock_irqrestore(&drm_minor_lock, flags);
235
236 DRM_DEBUG("new minor registered %d\n", minor->index);
237 return 0;
238
239err_debugfs:
240 drm_debugfs_cleanup(minor);
241 return ret;
242}
243
244static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
245{
246 struct drm_minor *minor;
247 unsigned long flags;
248
249 minor = *drm_minor_get_slot(dev, type);
250 if (!minor || !device_is_registered(minor->kdev))
251 return;
252
253 /* replace @minor with NULL so lookups will fail from now on */
254 spin_lock_irqsave(&drm_minor_lock, flags);
255 idr_replace(&drm_minors_idr, NULL, minor->index);
256 spin_unlock_irqrestore(&drm_minor_lock, flags);
257
258 device_del(minor->kdev);
259 dev_set_drvdata(minor->kdev, NULL); /* safety belt */
260 drm_debugfs_cleanup(minor);
261}
262
263/*
264 * Looks up the given minor-ID and returns the respective DRM-minor object. The
265 * refence-count of the underlying device is increased so you must release this
266 * object with drm_minor_release().
267 *
268 * As long as you hold this minor, it is guaranteed that the object and the
269 * minor->dev pointer will stay valid! However, the device may get unplugged and
270 * unregistered while you hold the minor.
271 */
272struct drm_minor *drm_minor_acquire(unsigned int minor_id)
273{
274 struct drm_minor *minor;
275 unsigned long flags;
276
277 spin_lock_irqsave(&drm_minor_lock, flags);
278 minor = idr_find(&drm_minors_idr, minor_id);
279 if (minor)
280 drm_dev_ref(minor->dev);
281 spin_unlock_irqrestore(&drm_minor_lock, flags);
282
283 if (!minor) {
284 return ERR_PTR(-ENODEV);
285 } else if (drm_device_is_unplugged(minor->dev)) {
286 drm_dev_unref(minor->dev);
287 return ERR_PTR(-ENODEV);
288 }
289
290 return minor;
291}
292
293void drm_minor_release(struct drm_minor *minor)
294{
295 drm_dev_unref(minor->dev);
296}
297
298/**
299 * DOC: driver instance overview
300 *
301 * A device instance for a drm driver is represented by struct &drm_device. This
302 * is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
303 * callbacks implemented by the driver. The driver then needs to initialize all
304 * the various subsystems for the drm device like memory management, vblank
305 * handling, modesetting support and intial output configuration plus obviously
306 * initialize all the corresponding hardware bits. An important part of this is
307 * also calling drm_dev_set_unique() to set the userspace-visible unique name of
308 * this device instance. Finally when everything is up and running and ready for
309 * userspace the device instance can be published using drm_dev_register().
310 *
311 * There is also deprecated support for initalizing device instances using
312 * bus-specific helpers and the ->load() callback. But due to
313 * backwards-compatibility needs the device instance have to be published too
314 * early, which requires unpretty global locking to make safe and is therefore
315 * only support for existing drivers not yet converted to the new scheme.
316 *
317 * When cleaning up a device instance everything needs to be done in reverse:
318 * First unpublish the device instance with drm_dev_unregister(). Then clean up
319 * any other resources allocated at device initialization and drop the driver's
320 * reference to &drm_device using drm_dev_unref().
321 *
322 * Note that the lifetime rules for &drm_device instance has still a lot of
323 * historical baggage. Hence use the reference counting provided by
324 * drm_dev_ref() and drm_dev_unref() only carefully.
325 *
326 * Also note that embedding of &drm_device is currently not (yet) supported (but
327 * it would be easy to add). Drivers can store driver-private data in the
328 * dev_priv field of &drm_device.
329 */
330
331/**
332 * drm_put_dev - Unregister and release a DRM device
333 * @dev: DRM device
334 *
335 * Called at module unload time or when a PCI device is unplugged.
336 *
337 * Cleans up all DRM device, calling drm_lastclose().
338 *
339 * Note: Use of this function is deprecated. It will eventually go away
340 * completely. Please use drm_dev_unregister() and drm_dev_unref() explicitly
341 * instead to make sure that the device isn't userspace accessible any more
342 * while teardown is in progress, ensuring that userspace can't access an
343 * inconsistent state.
344 */
345void drm_put_dev(struct drm_device *dev)
346{
347 DRM_DEBUG("\n");
348
349 if (!dev) {
350 DRM_ERROR("cleanup called no dev\n");
351 return;
352 }
353
354 drm_dev_unregister(dev);
355 drm_dev_unref(dev);
356}
357EXPORT_SYMBOL(drm_put_dev);
358
359void drm_unplug_dev(struct drm_device *dev)
360{
361 /* for a USB device */
362 drm_dev_unregister(dev);
363
364 mutex_lock(&drm_global_mutex);
365
366 drm_device_set_unplugged(dev);
367
368 if (dev->open_count == 0) {
369 drm_put_dev(dev);
370 }
371 mutex_unlock(&drm_global_mutex);
372}
373EXPORT_SYMBOL(drm_unplug_dev);
374
375/*
376 * DRM internal mount
377 * We want to be able to allocate our own "struct address_space" to control
378 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
379 * stand-alone address_space objects, so we need an underlying inode. As there
380 * is no way to allocate an independent inode easily, we need a fake internal
381 * VFS mount-point.
382 *
383 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
384 * frees it again. You are allowed to use iget() and iput() to get references to
385 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
386 * drm_fs_inode_free() call (which does not have to be the last iput()).
387 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
388 * between multiple inode-users. You could, technically, call
389 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
390 * iput(), but this way you'd end up with a new vfsmount for each inode.
391 */
392
393static int drm_fs_cnt;
394static struct vfsmount *drm_fs_mnt;
395
396static const struct dentry_operations drm_fs_dops = {
397 .d_dname = simple_dname,
398};
399
400static const struct super_operations drm_fs_sops = {
401 .statfs = simple_statfs,
402};
403
404static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
405 const char *dev_name, void *data)
406{
407 return mount_pseudo(fs_type,
408 "drm:",
409 &drm_fs_sops,
410 &drm_fs_dops,
411 0x010203ff);
412}
413
414static struct file_system_type drm_fs_type = {
415 .name = "drm",
416 .owner = THIS_MODULE,
417 .mount = drm_fs_mount,
418 .kill_sb = kill_anon_super,
419};
420
421static struct inode *drm_fs_inode_new(void)
422{
423 struct inode *inode;
424 int r;
425
426 r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
427 if (r < 0) {
428 DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
429 return ERR_PTR(r);
430 }
431
432 inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
433 if (IS_ERR(inode))
434 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
435
436 return inode;
437}
438
439static void drm_fs_inode_free(struct inode *inode)
440{
441 if (inode) {
442 iput(inode);
443 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
444 }
445}
446
447/**
448 * drm_dev_init - Initialise new DRM device
449 * @dev: DRM device
450 * @driver: DRM driver
451 * @parent: Parent device object
452 *
453 * Initialize a new DRM device. No device registration is done.
454 * Call drm_dev_register() to advertice the device to user space and register it
455 * with other core subsystems. This should be done last in the device
456 * initialization sequence to make sure userspace can't access an inconsistent
457 * state.
458 *
459 * The initial ref-count of the object is 1. Use drm_dev_ref() and
460 * drm_dev_unref() to take and drop further ref-counts.
461 *
462 * Note that for purely virtual devices @parent can be NULL.
463 *
464 * Drivers that do not want to allocate their own device struct
465 * embedding struct &drm_device can call drm_dev_alloc() instead.
466 *
467 * RETURNS:
468 * 0 on success, or error code on failure.
469 */
470int drm_dev_init(struct drm_device *dev,
471 struct drm_driver *driver,
472 struct device *parent)
473{
474 int ret;
475
476 kref_init(&dev->ref);
477 dev->dev = parent;
478 dev->driver = driver;
479
480 INIT_LIST_HEAD(&dev->filelist);
481 INIT_LIST_HEAD(&dev->ctxlist);
482 INIT_LIST_HEAD(&dev->vmalist);
483 INIT_LIST_HEAD(&dev->maplist);
484 INIT_LIST_HEAD(&dev->vblank_event_list);
485
486 spin_lock_init(&dev->buf_lock);
487 spin_lock_init(&dev->event_lock);
488 mutex_init(&dev->struct_mutex);
489 mutex_init(&dev->filelist_mutex);
490 mutex_init(&dev->ctxlist_mutex);
491 mutex_init(&dev->master_mutex);
492
493 dev->anon_inode = drm_fs_inode_new();
494 if (IS_ERR(dev->anon_inode)) {
495 ret = PTR_ERR(dev->anon_inode);
496 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
497 goto err_free;
498 }
499
500 if (drm_core_check_feature(dev, DRIVER_RENDER)) {
501 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
502 if (ret)
503 goto err_minors;
504 }
505
506 ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY);
507 if (ret)
508 goto err_minors;
509
510 ret = drm_ht_create(&dev->map_hash, 12);
511 if (ret)
512 goto err_minors;
513
514 drm_legacy_ctxbitmap_init(dev);
515
516 if (drm_core_check_feature(dev, DRIVER_GEM)) {
517 ret = drm_gem_init(dev);
518 if (ret) {
519 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
520 goto err_ctxbitmap;
521 }
522 }
523
524 /* Use the parent device name as DRM device unique identifier, but fall
525 * back to the driver name for virtual devices like vgem. */
526 ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name);
527 if (ret)
528 goto err_setunique;
529
530 return 0;
531
532err_setunique:
533 if (drm_core_check_feature(dev, DRIVER_GEM))
534 drm_gem_destroy(dev);
535err_ctxbitmap:
536 drm_legacy_ctxbitmap_cleanup(dev);
537 drm_ht_remove(&dev->map_hash);
538err_minors:
539 drm_minor_free(dev, DRM_MINOR_PRIMARY);
540 drm_minor_free(dev, DRM_MINOR_RENDER);
541 drm_minor_free(dev, DRM_MINOR_CONTROL);
542 drm_fs_inode_free(dev->anon_inode);
543err_free:
544 mutex_destroy(&dev->master_mutex);
545 mutex_destroy(&dev->ctxlist_mutex);
546 mutex_destroy(&dev->filelist_mutex);
547 mutex_destroy(&dev->struct_mutex);
548 return ret;
549}
550EXPORT_SYMBOL(drm_dev_init);
551
552/**
553 * drm_dev_alloc - Allocate new DRM device
554 * @driver: DRM driver to allocate device for
555 * @parent: Parent device object
556 *
557 * Allocate and initialize a new DRM device. No device registration is done.
558 * Call drm_dev_register() to advertice the device to user space and register it
559 * with other core subsystems. This should be done last in the device
560 * initialization sequence to make sure userspace can't access an inconsistent
561 * state.
562 *
563 * The initial ref-count of the object is 1. Use drm_dev_ref() and
564 * drm_dev_unref() to take and drop further ref-counts.
565 *
566 * Note that for purely virtual devices @parent can be NULL.
567 *
568 * Drivers that wish to subclass or embed struct &drm_device into their
569 * own struct should look at using drm_dev_init() instead.
570 *
571 * RETURNS:
572 * Pointer to new DRM device, or ERR_PTR on failure.
573 */
574struct drm_device *drm_dev_alloc(struct drm_driver *driver,
575 struct device *parent)
576{
577 struct drm_device *dev;
578 int ret;
579
580 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
581 if (!dev)
582 return ERR_PTR(-ENOMEM);
583
584 ret = drm_dev_init(dev, driver, parent);
585 if (ret) {
586 kfree(dev);
587 return ERR_PTR(ret);
588 }
589
590 return dev;
591}
592EXPORT_SYMBOL(drm_dev_alloc);
593
594static void drm_dev_release(struct kref *ref)
595{
596 struct drm_device *dev = container_of(ref, struct drm_device, ref);
597
598 if (drm_core_check_feature(dev, DRIVER_GEM))
599 drm_gem_destroy(dev);
600
601 drm_legacy_ctxbitmap_cleanup(dev);
602 drm_ht_remove(&dev->map_hash);
603 drm_fs_inode_free(dev->anon_inode);
604
605 drm_minor_free(dev, DRM_MINOR_PRIMARY);
606 drm_minor_free(dev, DRM_MINOR_RENDER);
607 drm_minor_free(dev, DRM_MINOR_CONTROL);
608
609 mutex_destroy(&dev->master_mutex);
610 mutex_destroy(&dev->ctxlist_mutex);
611 mutex_destroy(&dev->filelist_mutex);
612 mutex_destroy(&dev->struct_mutex);
613 kfree(dev->unique);
614 kfree(dev);
615}
616
617/**
618 * drm_dev_ref - Take reference of a DRM device
619 * @dev: device to take reference of or NULL
620 *
621 * This increases the ref-count of @dev by one. You *must* already own a
622 * reference when calling this. Use drm_dev_unref() to drop this reference
623 * again.
624 *
625 * This function never fails. However, this function does not provide *any*
626 * guarantee whether the device is alive or running. It only provides a
627 * reference to the object and the memory associated with it.
628 */
629void drm_dev_ref(struct drm_device *dev)
630{
631 if (dev)
632 kref_get(&dev->ref);
633}
634EXPORT_SYMBOL(drm_dev_ref);
635
636/**
637 * drm_dev_unref - Drop reference of a DRM device
638 * @dev: device to drop reference of or NULL
639 *
640 * This decreases the ref-count of @dev by one. The device is destroyed if the
641 * ref-count drops to zero.
642 */
643void drm_dev_unref(struct drm_device *dev)
644{
645 if (dev)
646 kref_put(&dev->ref, drm_dev_release);
647}
648EXPORT_SYMBOL(drm_dev_unref);
649
650static int create_compat_control_link(struct drm_device *dev)
651{
652 struct drm_minor *minor;
653 char *name;
654 int ret;
655
656 if (!drm_core_check_feature(dev, DRIVER_MODESET))
657 return 0;
658
659 minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
660 if (!minor)
661 return 0;
662
663 /*
664 * Some existing userspace out there uses the existing of the controlD*
665 * sysfs files to figure out whether it's a modeset driver. It only does
666 * readdir, hence a symlink is sufficient (and the least confusing
667 * option). Otherwise controlD* is entirely unused.
668 *
669 * Old controlD chardev have been allocated in the range
670 * 64-127.
671 */
672 name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64);
673 if (!name)
674 return -ENOMEM;
675
676 ret = sysfs_create_link(minor->kdev->kobj.parent,
677 &minor->kdev->kobj,
678 name);
679
680 kfree(name);
681
682 return ret;
683}
684
685static void remove_compat_control_link(struct drm_device *dev)
686{
687 struct drm_minor *minor;
688 char *name;
689
690 if (!drm_core_check_feature(dev, DRIVER_MODESET))
691 return;
692
693 minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
694 if (!minor)
695 return;
696
697 name = kasprintf(GFP_KERNEL, "controlD%d", minor->index);
698 if (!name)
699 return;
700
701 sysfs_remove_link(minor->kdev->kobj.parent, name);
702
703 kfree(name);
704}
705
706/**
707 * drm_dev_register - Register DRM device
708 * @dev: Device to register
709 * @flags: Flags passed to the driver's .load() function
710 *
711 * Register the DRM device @dev with the system, advertise device to user-space
712 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
713 * previously.
714 *
715 * Never call this twice on any device!
716 *
717 * NOTE: To ensure backward compatibility with existing drivers method this
718 * function calls the ->load() method after registering the device nodes,
719 * creating race conditions. Usage of the ->load() methods is therefore
720 * deprecated, drivers must perform all initialization before calling
721 * drm_dev_register().
722 *
723 * RETURNS:
724 * 0 on success, negative error code on failure.
725 */
726int drm_dev_register(struct drm_device *dev, unsigned long flags)
727{
728 int ret;
729
730 mutex_lock(&drm_global_mutex);
731
732 ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
733 if (ret)
734 goto err_minors;
735
736 ret = drm_minor_register(dev, DRM_MINOR_RENDER);
737 if (ret)
738 goto err_minors;
739
740 ret = drm_minor_register(dev, DRM_MINOR_PRIMARY);
741 if (ret)
742 goto err_minors;
743
744 ret = create_compat_control_link(dev);
745 if (ret)
746 goto err_minors;
747
748 dev->registered = true;
749
750 if (dev->driver->load) {
751 ret = dev->driver->load(dev, flags);
752 if (ret)
753 goto err_minors;
754 }
755
756 if (drm_core_check_feature(dev, DRIVER_MODESET))
757 drm_modeset_register_all(dev);
758
759 ret = 0;
760 goto out_unlock;
761
762err_minors:
763 remove_compat_control_link(dev);
764 drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
765 drm_minor_unregister(dev, DRM_MINOR_RENDER);
766 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
767out_unlock:
768 mutex_unlock(&drm_global_mutex);
769 return ret;
770}
771EXPORT_SYMBOL(drm_dev_register);
772
773/**
774 * drm_dev_unregister - Unregister DRM device
775 * @dev: Device to unregister
776 *
777 * Unregister the DRM device from the system. This does the reverse of
778 * drm_dev_register() but does not deallocate the device. The caller must call
779 * drm_dev_unref() to drop their final reference.
780 *
781 * This should be called first in the device teardown code to make sure
782 * userspace can't access the device instance any more.
783 */
784void drm_dev_unregister(struct drm_device *dev)
785{
786 struct drm_map_list *r_list, *list_temp;
787
788 drm_lastclose(dev);
789
790 dev->registered = false;
791
792 if (drm_core_check_feature(dev, DRIVER_MODESET))
793 drm_modeset_unregister_all(dev);
794
795 if (dev->driver->unload)
796 dev->driver->unload(dev);
797
798 if (dev->agp)
799 drm_pci_agp_destroy(dev);
800
801 drm_vblank_cleanup(dev);
802
803 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
804 drm_legacy_rmmap(dev, r_list->map);
805
806 remove_compat_control_link(dev);
807 drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
808 drm_minor_unregister(dev, DRM_MINOR_RENDER);
809 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
810}
811EXPORT_SYMBOL(drm_dev_unregister);
812
813/**
814 * drm_dev_set_unique - Set the unique name of a DRM device
815 * @dev: device of which to set the unique name
816 * @name: unique name
817 *
818 * Sets the unique name of a DRM device using the specified string. Drivers
819 * can use this at driver probe time if the unique name of the devices they
820 * drive is static.
821 *
822 * Return: 0 on success or a negative error code on failure.
823 */
824int drm_dev_set_unique(struct drm_device *dev, const char *name)
825{
826 kfree(dev->unique);
827 dev->unique = kstrdup(name, GFP_KERNEL);
828
829 return dev->unique ? 0 : -ENOMEM;
830}
831EXPORT_SYMBOL(drm_dev_set_unique);
832
833/*
834 * DRM Core
835 * The DRM core module initializes all global DRM objects and makes them
836 * available to drivers. Once setup, drivers can probe their respective
837 * devices.
838 * Currently, core management includes:
839 * - The "DRM-Global" key/value database
840 * - Global ID management for connectors
841 * - DRM major number allocation
842 * - DRM minor management
843 * - DRM sysfs class
844 * - DRM debugfs root
845 *
846 * Furthermore, the DRM core provides dynamic char-dev lookups. For each
847 * interface registered on a DRM device, you can request minor numbers from DRM
848 * core. DRM core takes care of major-number management and char-dev
849 * registration. A stub ->open() callback forwards any open() requests to the
850 * registered minor.
851 */
852
853static int drm_stub_open(struct inode *inode, struct file *filp)
854{
855 const struct file_operations *new_fops;
856 struct drm_minor *minor;
857 int err;
858
859 DRM_DEBUG("\n");
860
861 mutex_lock(&drm_global_mutex);
862 minor = drm_minor_acquire(iminor(inode));
863 if (IS_ERR(minor)) {
864 err = PTR_ERR(minor);
865 goto out_unlock;
866 }
867
868 new_fops = fops_get(minor->dev->driver->fops);
869 if (!new_fops) {
870 err = -ENODEV;
871 goto out_release;
872 }
873
874 replace_fops(filp, new_fops);
875 if (filp->f_op->open)
876 err = filp->f_op->open(inode, filp);
877 else
878 err = 0;
879
880out_release:
881 drm_minor_release(minor);
882out_unlock:
883 mutex_unlock(&drm_global_mutex);
884 return err;
885}
886
887static const struct file_operations drm_stub_fops = {
888 .owner = THIS_MODULE,
889 .open = drm_stub_open,
890 .llseek = noop_llseek,
891};
892
893static void drm_core_exit(void)
894{
895 unregister_chrdev(DRM_MAJOR, "drm");
896 debugfs_remove(drm_debugfs_root);
897 drm_sysfs_destroy();
898 idr_destroy(&drm_minors_idr);
899 drm_connector_ida_destroy();
900 drm_global_release();
901}
902
903static int __init drm_core_init(void)
904{
905 int ret;
906
907 drm_global_init();
908 drm_connector_ida_init();
909 idr_init(&drm_minors_idr);
910
911 ret = drm_sysfs_init();
912 if (ret < 0) {
913 DRM_ERROR("Cannot create DRM class: %d\n", ret);
914 goto error;
915 }
916
917 drm_debugfs_root = debugfs_create_dir("dri", NULL);
918 if (!drm_debugfs_root) {
919 ret = -ENOMEM;
920 DRM_ERROR("Cannot create debugfs-root: %d\n", ret);
921 goto error;
922 }
923
924 ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops);
925 if (ret < 0)
926 goto error;
927
928 DRM_INFO("Initialized\n");
929 return 0;
930
931error:
932 drm_core_exit();
933 return ret;
934}
935
936module_init(drm_core_init);
937module_exit(drm_core_exit);