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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)\n"
61"\t\tBit 7 (0x80) will enable LEASE messages (leasing code)");
62module_param_named(debug, drm_debug, int, 0600);
63
64static DEFINE_SPINLOCK(drm_minor_lock);
65static struct idr drm_minors_idr;
66
67/*
68 * If the drm core fails to init for whatever reason,
69 * we should prevent any drivers from registering with it.
70 * It's best to check this at drm_dev_init(), as some drivers
71 * prefer to embed struct drm_device into their own device
72 * structure and call drm_dev_init() themselves.
73 */
74static bool drm_core_init_complete = false;
75
76static struct dentry *drm_debugfs_root;
77
78/*
79 * DRM Minors
80 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
81 * of them is represented by a drm_minor object. Depending on the capabilities
82 * of the device-driver, different interfaces are registered.
83 *
84 * Minors can be accessed via dev->$minor_name. This pointer is either
85 * NULL or a valid drm_minor pointer and stays valid as long as the device is
86 * valid. This means, DRM minors have the same life-time as the underlying
87 * device. However, this doesn't mean that the minor is active. Minors are
88 * registered and unregistered dynamically according to device-state.
89 */
90
91static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
92 unsigned int type)
93{
94 switch (type) {
95 case DRM_MINOR_PRIMARY:
96 return &dev->primary;
97 case DRM_MINOR_RENDER:
98 return &dev->render;
99 case DRM_MINOR_CONTROL:
100 return &dev->control;
101 default:
102 BUG();
103 }
104}
105
106static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
107{
108 struct drm_minor *minor;
109 unsigned long flags;
110 int r;
111
112 minor = kzalloc(sizeof(*minor), GFP_KERNEL);
113 if (!minor)
114 return -ENOMEM;
115
116 minor->type = type;
117 minor->dev = dev;
118
119 idr_preload(GFP_KERNEL);
120 spin_lock_irqsave(&drm_minor_lock, flags);
121 r = idr_alloc(&drm_minors_idr,
122 NULL,
123 64 * type,
124 64 * (type + 1),
125 GFP_NOWAIT);
126 spin_unlock_irqrestore(&drm_minor_lock, flags);
127 idr_preload_end();
128
129 if (r < 0)
130 goto err_free;
131
132 minor->index = r;
133
134 minor->kdev = drm_sysfs_minor_alloc(minor);
135 if (IS_ERR(minor->kdev)) {
136 r = PTR_ERR(minor->kdev);
137 goto err_index;
138 }
139
140 *drm_minor_get_slot(dev, type) = minor;
141 return 0;
142
143err_index:
144 spin_lock_irqsave(&drm_minor_lock, flags);
145 idr_remove(&drm_minors_idr, minor->index);
146 spin_unlock_irqrestore(&drm_minor_lock, flags);
147err_free:
148 kfree(minor);
149 return r;
150}
151
152static void drm_minor_free(struct drm_device *dev, unsigned int type)
153{
154 struct drm_minor **slot, *minor;
155 unsigned long flags;
156
157 slot = drm_minor_get_slot(dev, type);
158 minor = *slot;
159 if (!minor)
160 return;
161
162 put_device(minor->kdev);
163
164 spin_lock_irqsave(&drm_minor_lock, flags);
165 idr_remove(&drm_minors_idr, minor->index);
166 spin_unlock_irqrestore(&drm_minor_lock, flags);
167
168 kfree(minor);
169 *slot = NULL;
170}
171
172static int drm_minor_register(struct drm_device *dev, unsigned int type)
173{
174 struct drm_minor *minor;
175 unsigned long flags;
176 int ret;
177
178 DRM_DEBUG("\n");
179
180 minor = *drm_minor_get_slot(dev, type);
181 if (!minor)
182 return 0;
183
184 ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
185 if (ret) {
186 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
187 goto err_debugfs;
188 }
189
190 ret = device_add(minor->kdev);
191 if (ret)
192 goto err_debugfs;
193
194 /* replace NULL with @minor so lookups will succeed from now on */
195 spin_lock_irqsave(&drm_minor_lock, flags);
196 idr_replace(&drm_minors_idr, minor, minor->index);
197 spin_unlock_irqrestore(&drm_minor_lock, flags);
198
199 DRM_DEBUG("new minor registered %d\n", minor->index);
200 return 0;
201
202err_debugfs:
203 drm_debugfs_cleanup(minor);
204 return ret;
205}
206
207static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
208{
209 struct drm_minor *minor;
210 unsigned long flags;
211
212 minor = *drm_minor_get_slot(dev, type);
213 if (!minor || !device_is_registered(minor->kdev))
214 return;
215
216 /* replace @minor with NULL so lookups will fail from now on */
217 spin_lock_irqsave(&drm_minor_lock, flags);
218 idr_replace(&drm_minors_idr, NULL, minor->index);
219 spin_unlock_irqrestore(&drm_minor_lock, flags);
220
221 device_del(minor->kdev);
222 dev_set_drvdata(minor->kdev, NULL); /* safety belt */
223 drm_debugfs_cleanup(minor);
224}
225
226/*
227 * Looks up the given minor-ID and returns the respective DRM-minor object. The
228 * refence-count of the underlying device is increased so you must release this
229 * object with drm_minor_release().
230 *
231 * As long as you hold this minor, it is guaranteed that the object and the
232 * minor->dev pointer will stay valid! However, the device may get unplugged and
233 * unregistered while you hold the minor.
234 */
235struct drm_minor *drm_minor_acquire(unsigned int minor_id)
236{
237 struct drm_minor *minor;
238 unsigned long flags;
239
240 spin_lock_irqsave(&drm_minor_lock, flags);
241 minor = idr_find(&drm_minors_idr, minor_id);
242 if (minor)
243 drm_dev_get(minor->dev);
244 spin_unlock_irqrestore(&drm_minor_lock, flags);
245
246 if (!minor) {
247 return ERR_PTR(-ENODEV);
248 } else if (drm_dev_is_unplugged(minor->dev)) {
249 drm_dev_put(minor->dev);
250 return ERR_PTR(-ENODEV);
251 }
252
253 return minor;
254}
255
256void drm_minor_release(struct drm_minor *minor)
257{
258 drm_dev_put(minor->dev);
259}
260
261/**
262 * DOC: driver instance overview
263 *
264 * A device instance for a drm driver is represented by &struct drm_device. This
265 * is allocated with drm_dev_alloc(), usually from bus-specific ->probe()
266 * callbacks implemented by the driver. The driver then needs to initialize all
267 * the various subsystems for the drm device like memory management, vblank
268 * handling, modesetting support and intial output configuration plus obviously
269 * initialize all the corresponding hardware bits. An important part of this is
270 * also calling drm_dev_set_unique() to set the userspace-visible unique name of
271 * this device instance. Finally when everything is up and running and ready for
272 * userspace the device instance can be published using drm_dev_register().
273 *
274 * There is also deprecated support for initalizing device instances using
275 * bus-specific helpers and the &drm_driver.load callback. But due to
276 * backwards-compatibility needs the device instance have to be published too
277 * early, which requires unpretty global locking to make safe and is therefore
278 * only support for existing drivers not yet converted to the new scheme.
279 *
280 * When cleaning up a device instance everything needs to be done in reverse:
281 * First unpublish the device instance with drm_dev_unregister(). Then clean up
282 * any other resources allocated at device initialization and drop the driver's
283 * reference to &drm_device using drm_dev_put().
284 *
285 * Note that the lifetime rules for &drm_device instance has still a lot of
286 * historical baggage. Hence use the reference counting provided by
287 * drm_dev_get() and drm_dev_put() only carefully.
288 *
289 * It is recommended that drivers embed &struct drm_device into their own device
290 * structure, which is supported through drm_dev_init().
291 */
292
293/**
294 * drm_put_dev - Unregister and release a DRM device
295 * @dev: DRM device
296 *
297 * Called at module unload time or when a PCI device is unplugged.
298 *
299 * Cleans up all DRM device, calling drm_lastclose().
300 *
301 * Note: Use of this function is deprecated. It will eventually go away
302 * completely. Please use drm_dev_unregister() and drm_dev_put() explicitly
303 * instead to make sure that the device isn't userspace accessible any more
304 * while teardown is in progress, ensuring that userspace can't access an
305 * inconsistent state.
306 */
307void drm_put_dev(struct drm_device *dev)
308{
309 DRM_DEBUG("\n");
310
311 if (!dev) {
312 DRM_ERROR("cleanup called no dev\n");
313 return;
314 }
315
316 drm_dev_unregister(dev);
317 drm_dev_put(dev);
318}
319EXPORT_SYMBOL(drm_put_dev);
320
321static void drm_device_set_unplugged(struct drm_device *dev)
322{
323 smp_wmb();
324 atomic_set(&dev->unplugged, 1);
325}
326
327/**
328 * drm_dev_unplug - unplug a DRM device
329 * @dev: DRM device
330 *
331 * This unplugs a hotpluggable DRM device, which makes it inaccessible to
332 * userspace operations. Entry-points can use drm_dev_is_unplugged(). This
333 * essentially unregisters the device like drm_dev_unregister(), but can be
334 * called while there are still open users of @dev.
335 */
336void drm_dev_unplug(struct drm_device *dev)
337{
338 drm_dev_unregister(dev);
339
340 mutex_lock(&drm_global_mutex);
341 drm_device_set_unplugged(dev);
342 if (dev->open_count == 0)
343 drm_dev_put(dev);
344 mutex_unlock(&drm_global_mutex);
345}
346EXPORT_SYMBOL(drm_dev_unplug);
347
348/*
349 * DRM internal mount
350 * We want to be able to allocate our own "struct address_space" to control
351 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
352 * stand-alone address_space objects, so we need an underlying inode. As there
353 * is no way to allocate an independent inode easily, we need a fake internal
354 * VFS mount-point.
355 *
356 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
357 * frees it again. You are allowed to use iget() and iput() to get references to
358 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
359 * drm_fs_inode_free() call (which does not have to be the last iput()).
360 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
361 * between multiple inode-users. You could, technically, call
362 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
363 * iput(), but this way you'd end up with a new vfsmount for each inode.
364 */
365
366static int drm_fs_cnt;
367static struct vfsmount *drm_fs_mnt;
368
369static const struct dentry_operations drm_fs_dops = {
370 .d_dname = simple_dname,
371};
372
373static const struct super_operations drm_fs_sops = {
374 .statfs = simple_statfs,
375};
376
377static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags,
378 const char *dev_name, void *data)
379{
380 return mount_pseudo(fs_type,
381 "drm:",
382 &drm_fs_sops,
383 &drm_fs_dops,
384 0x010203ff);
385}
386
387static struct file_system_type drm_fs_type = {
388 .name = "drm",
389 .owner = THIS_MODULE,
390 .mount = drm_fs_mount,
391 .kill_sb = kill_anon_super,
392};
393
394static struct inode *drm_fs_inode_new(void)
395{
396 struct inode *inode;
397 int r;
398
399 r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
400 if (r < 0) {
401 DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
402 return ERR_PTR(r);
403 }
404
405 inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
406 if (IS_ERR(inode))
407 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
408
409 return inode;
410}
411
412static void drm_fs_inode_free(struct inode *inode)
413{
414 if (inode) {
415 iput(inode);
416 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
417 }
418}
419
420/**
421 * drm_dev_init - Initialise new DRM device
422 * @dev: DRM device
423 * @driver: DRM driver
424 * @parent: Parent device object
425 *
426 * Initialize a new DRM device. No device registration is done.
427 * Call drm_dev_register() to advertice the device to user space and register it
428 * with other core subsystems. This should be done last in the device
429 * initialization sequence to make sure userspace can't access an inconsistent
430 * state.
431 *
432 * The initial ref-count of the object is 1. Use drm_dev_get() and
433 * drm_dev_put() to take and drop further ref-counts.
434 *
435 * Note that for purely virtual devices @parent can be NULL.
436 *
437 * Drivers that do not want to allocate their own device struct
438 * embedding &struct drm_device can call drm_dev_alloc() instead. For drivers
439 * that do embed &struct drm_device it must be placed first in the overall
440 * structure, and the overall structure must be allocated using kmalloc(): The
441 * drm core's release function unconditionally calls kfree() on the @dev pointer
442 * when the final reference is released. To override this behaviour, and so
443 * allow embedding of the drm_device inside the driver's device struct at an
444 * arbitrary offset, you must supply a &drm_driver.release callback and control
445 * the finalization explicitly.
446 *
447 * RETURNS:
448 * 0 on success, or error code on failure.
449 */
450int drm_dev_init(struct drm_device *dev,
451 struct drm_driver *driver,
452 struct device *parent)
453{
454 int ret;
455
456 if (!drm_core_init_complete) {
457 DRM_ERROR("DRM core is not initialized\n");
458 return -ENODEV;
459 }
460
461 kref_init(&dev->ref);
462 dev->dev = parent;
463 dev->driver = driver;
464
465 INIT_LIST_HEAD(&dev->filelist);
466 INIT_LIST_HEAD(&dev->ctxlist);
467 INIT_LIST_HEAD(&dev->vmalist);
468 INIT_LIST_HEAD(&dev->maplist);
469 INIT_LIST_HEAD(&dev->vblank_event_list);
470
471 spin_lock_init(&dev->buf_lock);
472 spin_lock_init(&dev->event_lock);
473 mutex_init(&dev->struct_mutex);
474 mutex_init(&dev->filelist_mutex);
475 mutex_init(&dev->ctxlist_mutex);
476 mutex_init(&dev->master_mutex);
477
478 dev->anon_inode = drm_fs_inode_new();
479 if (IS_ERR(dev->anon_inode)) {
480 ret = PTR_ERR(dev->anon_inode);
481 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
482 goto err_free;
483 }
484
485 if (drm_core_check_feature(dev, DRIVER_RENDER)) {
486 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
487 if (ret)
488 goto err_minors;
489 }
490
491 ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY);
492 if (ret)
493 goto err_minors;
494
495 ret = drm_ht_create(&dev->map_hash, 12);
496 if (ret)
497 goto err_minors;
498
499 drm_legacy_ctxbitmap_init(dev);
500
501 if (drm_core_check_feature(dev, DRIVER_GEM)) {
502 ret = drm_gem_init(dev);
503 if (ret) {
504 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
505 goto err_ctxbitmap;
506 }
507 }
508
509 /* Use the parent device name as DRM device unique identifier, but fall
510 * back to the driver name for virtual devices like vgem. */
511 ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name);
512 if (ret)
513 goto err_setunique;
514
515 return 0;
516
517err_setunique:
518 if (drm_core_check_feature(dev, DRIVER_GEM))
519 drm_gem_destroy(dev);
520err_ctxbitmap:
521 drm_legacy_ctxbitmap_cleanup(dev);
522 drm_ht_remove(&dev->map_hash);
523err_minors:
524 drm_minor_free(dev, DRM_MINOR_PRIMARY);
525 drm_minor_free(dev, DRM_MINOR_RENDER);
526 drm_minor_free(dev, DRM_MINOR_CONTROL);
527 drm_fs_inode_free(dev->anon_inode);
528err_free:
529 mutex_destroy(&dev->master_mutex);
530 mutex_destroy(&dev->ctxlist_mutex);
531 mutex_destroy(&dev->filelist_mutex);
532 mutex_destroy(&dev->struct_mutex);
533 return ret;
534}
535EXPORT_SYMBOL(drm_dev_init);
536
537/**
538 * drm_dev_fini - Finalize a dead DRM device
539 * @dev: DRM device
540 *
541 * Finalize a dead DRM device. This is the converse to drm_dev_init() and
542 * frees up all data allocated by it. All driver private data should be
543 * finalized first. Note that this function does not free the @dev, that is
544 * left to the caller.
545 *
546 * The ref-count of @dev must be zero, and drm_dev_fini() should only be called
547 * from a &drm_driver.release callback.
548 */
549void drm_dev_fini(struct drm_device *dev)
550{
551 drm_vblank_cleanup(dev);
552
553 if (drm_core_check_feature(dev, DRIVER_GEM))
554 drm_gem_destroy(dev);
555
556 drm_legacy_ctxbitmap_cleanup(dev);
557 drm_ht_remove(&dev->map_hash);
558 drm_fs_inode_free(dev->anon_inode);
559
560 drm_minor_free(dev, DRM_MINOR_PRIMARY);
561 drm_minor_free(dev, DRM_MINOR_RENDER);
562 drm_minor_free(dev, DRM_MINOR_CONTROL);
563
564 mutex_destroy(&dev->master_mutex);
565 mutex_destroy(&dev->ctxlist_mutex);
566 mutex_destroy(&dev->filelist_mutex);
567 mutex_destroy(&dev->struct_mutex);
568 kfree(dev->unique);
569}
570EXPORT_SYMBOL(drm_dev_fini);
571
572/**
573 * drm_dev_alloc - Allocate new DRM device
574 * @driver: DRM driver to allocate device for
575 * @parent: Parent device object
576 *
577 * Allocate and initialize a new DRM device. No device registration is done.
578 * Call drm_dev_register() to advertice the device to user space and register it
579 * with other core subsystems. This should be done last in the device
580 * initialization sequence to make sure userspace can't access an inconsistent
581 * state.
582 *
583 * The initial ref-count of the object is 1. Use drm_dev_get() and
584 * drm_dev_put() to take and drop further ref-counts.
585 *
586 * Note that for purely virtual devices @parent can be NULL.
587 *
588 * Drivers that wish to subclass or embed &struct drm_device into their
589 * own struct should look at using drm_dev_init() instead.
590 *
591 * RETURNS:
592 * Pointer to new DRM device, or ERR_PTR on failure.
593 */
594struct drm_device *drm_dev_alloc(struct drm_driver *driver,
595 struct device *parent)
596{
597 struct drm_device *dev;
598 int ret;
599
600 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
601 if (!dev)
602 return ERR_PTR(-ENOMEM);
603
604 ret = drm_dev_init(dev, driver, parent);
605 if (ret) {
606 kfree(dev);
607 return ERR_PTR(ret);
608 }
609
610 return dev;
611}
612EXPORT_SYMBOL(drm_dev_alloc);
613
614static void drm_dev_release(struct kref *ref)
615{
616 struct drm_device *dev = container_of(ref, struct drm_device, ref);
617
618 if (dev->driver->release) {
619 dev->driver->release(dev);
620 } else {
621 drm_dev_fini(dev);
622 kfree(dev);
623 }
624}
625
626/**
627 * drm_dev_get - Take reference of a DRM device
628 * @dev: device to take reference of or NULL
629 *
630 * This increases the ref-count of @dev by one. You *must* already own a
631 * reference when calling this. Use drm_dev_put() to drop this reference
632 * again.
633 *
634 * This function never fails. However, this function does not provide *any*
635 * guarantee whether the device is alive or running. It only provides a
636 * reference to the object and the memory associated with it.
637 */
638void drm_dev_get(struct drm_device *dev)
639{
640 if (dev)
641 kref_get(&dev->ref);
642}
643EXPORT_SYMBOL(drm_dev_get);
644
645/**
646 * drm_dev_put - Drop reference of a DRM device
647 * @dev: device to drop reference of or NULL
648 *
649 * This decreases the ref-count of @dev by one. The device is destroyed if the
650 * ref-count drops to zero.
651 */
652void drm_dev_put(struct drm_device *dev)
653{
654 if (dev)
655 kref_put(&dev->ref, drm_dev_release);
656}
657EXPORT_SYMBOL(drm_dev_put);
658
659/**
660 * drm_dev_unref - Drop reference of a DRM device
661 * @dev: device to drop reference of or NULL
662 *
663 * This is a compatibility alias for drm_dev_put() and should not be used by new
664 * code.
665 */
666void drm_dev_unref(struct drm_device *dev)
667{
668 drm_dev_put(dev);
669}
670EXPORT_SYMBOL(drm_dev_unref);
671
672static int create_compat_control_link(struct drm_device *dev)
673{
674 struct drm_minor *minor;
675 char *name;
676 int ret;
677
678 if (!drm_core_check_feature(dev, DRIVER_MODESET))
679 return 0;
680
681 minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
682 if (!minor)
683 return 0;
684
685 /*
686 * Some existing userspace out there uses the existing of the controlD*
687 * sysfs files to figure out whether it's a modeset driver. It only does
688 * readdir, hence a symlink is sufficient (and the least confusing
689 * option). Otherwise controlD* is entirely unused.
690 *
691 * Old controlD chardev have been allocated in the range
692 * 64-127.
693 */
694 name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64);
695 if (!name)
696 return -ENOMEM;
697
698 ret = sysfs_create_link(minor->kdev->kobj.parent,
699 &minor->kdev->kobj,
700 name);
701
702 kfree(name);
703
704 return ret;
705}
706
707static void remove_compat_control_link(struct drm_device *dev)
708{
709 struct drm_minor *minor;
710 char *name;
711
712 if (!drm_core_check_feature(dev, DRIVER_MODESET))
713 return;
714
715 minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
716 if (!minor)
717 return;
718
719 name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64);
720 if (!name)
721 return;
722
723 sysfs_remove_link(minor->kdev->kobj.parent, name);
724
725 kfree(name);
726}
727
728/**
729 * drm_dev_register - Register DRM device
730 * @dev: Device to register
731 * @flags: Flags passed to the driver's .load() function
732 *
733 * Register the DRM device @dev with the system, advertise device to user-space
734 * and start normal device operation. @dev must be allocated via drm_dev_alloc()
735 * previously.
736 *
737 * Never call this twice on any device!
738 *
739 * NOTE: To ensure backward compatibility with existing drivers method this
740 * function calls the &drm_driver.load method after registering the device
741 * nodes, creating race conditions. Usage of the &drm_driver.load methods is
742 * therefore deprecated, drivers must perform all initialization before calling
743 * drm_dev_register().
744 *
745 * RETURNS:
746 * 0 on success, negative error code on failure.
747 */
748int drm_dev_register(struct drm_device *dev, unsigned long flags)
749{
750 struct drm_driver *driver = dev->driver;
751 int ret;
752
753 mutex_lock(&drm_global_mutex);
754
755 ret = drm_minor_register(dev, DRM_MINOR_CONTROL);
756 if (ret)
757 goto err_minors;
758
759 ret = drm_minor_register(dev, DRM_MINOR_RENDER);
760 if (ret)
761 goto err_minors;
762
763 ret = drm_minor_register(dev, DRM_MINOR_PRIMARY);
764 if (ret)
765 goto err_minors;
766
767 ret = create_compat_control_link(dev);
768 if (ret)
769 goto err_minors;
770
771 dev->registered = true;
772
773 if (dev->driver->load) {
774 ret = dev->driver->load(dev, flags);
775 if (ret)
776 goto err_minors;
777 }
778
779 if (drm_core_check_feature(dev, DRIVER_MODESET))
780 drm_modeset_register_all(dev);
781
782 ret = 0;
783
784 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
785 driver->name, driver->major, driver->minor,
786 driver->patchlevel, driver->date,
787 dev->dev ? dev_name(dev->dev) : "virtual device",
788 dev->primary->index);
789
790 goto out_unlock;
791
792err_minors:
793 remove_compat_control_link(dev);
794 drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
795 drm_minor_unregister(dev, DRM_MINOR_RENDER);
796 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
797out_unlock:
798 mutex_unlock(&drm_global_mutex);
799 return ret;
800}
801EXPORT_SYMBOL(drm_dev_register);
802
803/**
804 * drm_dev_unregister - Unregister DRM device
805 * @dev: Device to unregister
806 *
807 * Unregister the DRM device from the system. This does the reverse of
808 * drm_dev_register() but does not deallocate the device. The caller must call
809 * drm_dev_put() to drop their final reference.
810 *
811 * A special form of unregistering for hotpluggable devices is drm_dev_unplug(),
812 * which can be called while there are still open users of @dev.
813 *
814 * This should be called first in the device teardown code to make sure
815 * userspace can't access the device instance any more.
816 */
817void drm_dev_unregister(struct drm_device *dev)
818{
819 struct drm_map_list *r_list, *list_temp;
820
821 if (drm_core_check_feature(dev, DRIVER_LEGACY))
822 drm_lastclose(dev);
823
824 dev->registered = false;
825
826 if (drm_core_check_feature(dev, DRIVER_MODESET))
827 drm_modeset_unregister_all(dev);
828
829 if (dev->driver->unload)
830 dev->driver->unload(dev);
831
832 if (dev->agp)
833 drm_pci_agp_destroy(dev);
834
835 list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head)
836 drm_legacy_rmmap(dev, r_list->map);
837
838 remove_compat_control_link(dev);
839 drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
840 drm_minor_unregister(dev, DRM_MINOR_RENDER);
841 drm_minor_unregister(dev, DRM_MINOR_CONTROL);
842}
843EXPORT_SYMBOL(drm_dev_unregister);
844
845/**
846 * drm_dev_set_unique - Set the unique name of a DRM device
847 * @dev: device of which to set the unique name
848 * @name: unique name
849 *
850 * Sets the unique name of a DRM device using the specified string. Drivers
851 * can use this at driver probe time if the unique name of the devices they
852 * drive is static.
853 *
854 * Return: 0 on success or a negative error code on failure.
855 */
856int drm_dev_set_unique(struct drm_device *dev, const char *name)
857{
858 kfree(dev->unique);
859 dev->unique = kstrdup(name, GFP_KERNEL);
860
861 return dev->unique ? 0 : -ENOMEM;
862}
863EXPORT_SYMBOL(drm_dev_set_unique);
864
865/*
866 * DRM Core
867 * The DRM core module initializes all global DRM objects and makes them
868 * available to drivers. Once setup, drivers can probe their respective
869 * devices.
870 * Currently, core management includes:
871 * - The "DRM-Global" key/value database
872 * - Global ID management for connectors
873 * - DRM major number allocation
874 * - DRM minor management
875 * - DRM sysfs class
876 * - DRM debugfs root
877 *
878 * Furthermore, the DRM core provides dynamic char-dev lookups. For each
879 * interface registered on a DRM device, you can request minor numbers from DRM
880 * core. DRM core takes care of major-number management and char-dev
881 * registration. A stub ->open() callback forwards any open() requests to the
882 * registered minor.
883 */
884
885static int drm_stub_open(struct inode *inode, struct file *filp)
886{
887 const struct file_operations *new_fops;
888 struct drm_minor *minor;
889 int err;
890
891 DRM_DEBUG("\n");
892
893 mutex_lock(&drm_global_mutex);
894 minor = drm_minor_acquire(iminor(inode));
895 if (IS_ERR(minor)) {
896 err = PTR_ERR(minor);
897 goto out_unlock;
898 }
899
900 new_fops = fops_get(minor->dev->driver->fops);
901 if (!new_fops) {
902 err = -ENODEV;
903 goto out_release;
904 }
905
906 replace_fops(filp, new_fops);
907 if (filp->f_op->open)
908 err = filp->f_op->open(inode, filp);
909 else
910 err = 0;
911
912out_release:
913 drm_minor_release(minor);
914out_unlock:
915 mutex_unlock(&drm_global_mutex);
916 return err;
917}
918
919static const struct file_operations drm_stub_fops = {
920 .owner = THIS_MODULE,
921 .open = drm_stub_open,
922 .llseek = noop_llseek,
923};
924
925static void drm_core_exit(void)
926{
927 unregister_chrdev(DRM_MAJOR, "drm");
928 debugfs_remove(drm_debugfs_root);
929 drm_sysfs_destroy();
930 idr_destroy(&drm_minors_idr);
931 drm_connector_ida_destroy();
932 drm_global_release();
933}
934
935static int __init drm_core_init(void)
936{
937 int ret;
938
939 drm_global_init();
940 drm_connector_ida_init();
941 idr_init(&drm_minors_idr);
942
943 ret = drm_sysfs_init();
944 if (ret < 0) {
945 DRM_ERROR("Cannot create DRM class: %d\n", ret);
946 goto error;
947 }
948
949 drm_debugfs_root = debugfs_create_dir("dri", NULL);
950 if (!drm_debugfs_root) {
951 ret = -ENOMEM;
952 DRM_ERROR("Cannot create debugfs-root: %d\n", ret);
953 goto error;
954 }
955
956 ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops);
957 if (ret < 0)
958 goto error;
959
960 drm_core_init_complete = true;
961
962 DRM_DEBUG("Initialized\n");
963 return 0;
964
965error:
966 drm_core_exit();
967 return ret;
968}
969
970module_init(drm_core_init);
971module_exit(drm_core_exit);