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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/pseudo_fs.h>
35#include <linux/slab.h>
36#include <linux/srcu.h>
37
38#include <drm/drm_accel.h>
39#include <drm/drm_cache.h>
40#include <drm/drm_client.h>
41#include <drm/drm_color_mgmt.h>
42#include <drm/drm_drv.h>
43#include <drm/drm_file.h>
44#include <drm/drm_managed.h>
45#include <drm/drm_mode_object.h>
46#include <drm/drm_print.h>
47#include <drm/drm_privacy_screen_machine.h>
48
49#include "drm_crtc_internal.h"
50#include "drm_internal.h"
51
52MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl");
53MODULE_DESCRIPTION("DRM shared core routines");
54MODULE_LICENSE("GPL and additional rights");
55
56static DEFINE_SPINLOCK(drm_minor_lock);
57static struct idr drm_minors_idr;
58
59/*
60 * If the drm core fails to init for whatever reason,
61 * we should prevent any drivers from registering with it.
62 * It's best to check this at drm_dev_init(), as some drivers
63 * prefer to embed struct drm_device into their own device
64 * structure and call drm_dev_init() themselves.
65 */
66static bool drm_core_init_complete;
67
68static struct dentry *drm_debugfs_root;
69
70DEFINE_STATIC_SRCU(drm_unplug_srcu);
71
72/*
73 * DRM Minors
74 * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
75 * of them is represented by a drm_minor object. Depending on the capabilities
76 * of the device-driver, different interfaces are registered.
77 *
78 * Minors can be accessed via dev->$minor_name. This pointer is either
79 * NULL or a valid drm_minor pointer and stays valid as long as the device is
80 * valid. This means, DRM minors have the same life-time as the underlying
81 * device. However, this doesn't mean that the minor is active. Minors are
82 * registered and unregistered dynamically according to device-state.
83 */
84
85static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
86 enum drm_minor_type type)
87{
88 switch (type) {
89 case DRM_MINOR_PRIMARY:
90 return &dev->primary;
91 case DRM_MINOR_RENDER:
92 return &dev->render;
93 case DRM_MINOR_ACCEL:
94 return &dev->accel;
95 default:
96 BUG();
97 }
98}
99
100static void drm_minor_alloc_release(struct drm_device *dev, void *data)
101{
102 struct drm_minor *minor = data;
103 unsigned long flags;
104
105 WARN_ON(dev != minor->dev);
106
107 put_device(minor->kdev);
108
109 if (minor->type == DRM_MINOR_ACCEL) {
110 accel_minor_remove(minor->index);
111 } else {
112 spin_lock_irqsave(&drm_minor_lock, flags);
113 idr_remove(&drm_minors_idr, minor->index);
114 spin_unlock_irqrestore(&drm_minor_lock, flags);
115 }
116}
117
118static int drm_minor_alloc(struct drm_device *dev, enum drm_minor_type type)
119{
120 struct drm_minor *minor;
121 unsigned long flags;
122 int r;
123
124 minor = drmm_kzalloc(dev, sizeof(*minor), GFP_KERNEL);
125 if (!minor)
126 return -ENOMEM;
127
128 minor->type = type;
129 minor->dev = dev;
130
131 idr_preload(GFP_KERNEL);
132 if (type == DRM_MINOR_ACCEL) {
133 r = accel_minor_alloc();
134 } else {
135 spin_lock_irqsave(&drm_minor_lock, flags);
136 r = idr_alloc(&drm_minors_idr,
137 NULL,
138 64 * type,
139 64 * (type + 1),
140 GFP_NOWAIT);
141 spin_unlock_irqrestore(&drm_minor_lock, flags);
142 }
143 idr_preload_end();
144
145 if (r < 0)
146 return r;
147
148 minor->index = r;
149
150 r = drmm_add_action_or_reset(dev, drm_minor_alloc_release, minor);
151 if (r)
152 return r;
153
154 minor->kdev = drm_sysfs_minor_alloc(minor);
155 if (IS_ERR(minor->kdev))
156 return PTR_ERR(minor->kdev);
157
158 *drm_minor_get_slot(dev, type) = minor;
159 return 0;
160}
161
162static int drm_minor_register(struct drm_device *dev, enum drm_minor_type type)
163{
164 struct drm_minor *minor;
165 unsigned long flags;
166 int ret;
167
168 DRM_DEBUG("\n");
169
170 minor = *drm_minor_get_slot(dev, type);
171 if (!minor)
172 return 0;
173
174 if (minor->type != DRM_MINOR_ACCEL) {
175 ret = drm_debugfs_register(minor, minor->index,
176 drm_debugfs_root);
177 if (ret) {
178 DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
179 goto err_debugfs;
180 }
181 }
182
183 ret = device_add(minor->kdev);
184 if (ret)
185 goto err_debugfs;
186
187 /* replace NULL with @minor so lookups will succeed from now on */
188 if (minor->type == DRM_MINOR_ACCEL) {
189 accel_minor_replace(minor, minor->index);
190 } else {
191 spin_lock_irqsave(&drm_minor_lock, flags);
192 idr_replace(&drm_minors_idr, minor, minor->index);
193 spin_unlock_irqrestore(&drm_minor_lock, flags);
194 }
195
196 DRM_DEBUG("new minor registered %d\n", minor->index);
197 return 0;
198
199err_debugfs:
200 drm_debugfs_unregister(minor);
201 return ret;
202}
203
204static void drm_minor_unregister(struct drm_device *dev, enum drm_minor_type type)
205{
206 struct drm_minor *minor;
207 unsigned long flags;
208
209 minor = *drm_minor_get_slot(dev, type);
210 if (!minor || !device_is_registered(minor->kdev))
211 return;
212
213 /* replace @minor with NULL so lookups will fail from now on */
214 if (minor->type == DRM_MINOR_ACCEL) {
215 accel_minor_replace(NULL, minor->index);
216 } else {
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
222 device_del(minor->kdev);
223 dev_set_drvdata(minor->kdev, NULL); /* safety belt */
224 drm_debugfs_unregister(minor);
225}
226
227/*
228 * Looks up the given minor-ID and returns the respective DRM-minor object. The
229 * refence-count of the underlying device is increased so you must release this
230 * object with drm_minor_release().
231 *
232 * As long as you hold this minor, it is guaranteed that the object and the
233 * minor->dev pointer will stay valid! However, the device may get unplugged and
234 * unregistered while you hold the minor.
235 */
236struct drm_minor *drm_minor_acquire(unsigned int minor_id)
237{
238 struct drm_minor *minor;
239 unsigned long flags;
240
241 spin_lock_irqsave(&drm_minor_lock, flags);
242 minor = idr_find(&drm_minors_idr, minor_id);
243 if (minor)
244 drm_dev_get(minor->dev);
245 spin_unlock_irqrestore(&drm_minor_lock, flags);
246
247 if (!minor) {
248 return ERR_PTR(-ENODEV);
249 } else if (drm_dev_is_unplugged(minor->dev)) {
250 drm_dev_put(minor->dev);
251 return ERR_PTR(-ENODEV);
252 }
253
254 return minor;
255}
256
257void drm_minor_release(struct drm_minor *minor)
258{
259 drm_dev_put(minor->dev);
260}
261
262/**
263 * DOC: driver instance overview
264 *
265 * A device instance for a drm driver is represented by &struct drm_device. This
266 * is allocated and initialized with devm_drm_dev_alloc(), usually from
267 * bus-specific ->probe() callbacks implemented by the driver. The driver then
268 * needs to initialize all the various subsystems for the drm device like memory
269 * management, vblank handling, modesetting support and initial output
270 * configuration plus obviously initialize all the corresponding hardware bits.
271 * Finally when everything is up and running and ready for userspace the device
272 * instance can be published using drm_dev_register().
273 *
274 * There is also deprecated support for initializing 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 any allocation or resource which is visible to userspace must be
286 * released only when the final drm_dev_put() is called, and not when the
287 * driver is unbound from the underlying physical struct &device. Best to use
288 * &drm_device managed resources with drmm_add_action(), drmm_kmalloc() and
289 * related functions.
290 *
291 * devres managed resources like devm_kmalloc() can only be used for resources
292 * directly related to the underlying hardware device, and only used in code
293 * paths fully protected by drm_dev_enter() and drm_dev_exit().
294 *
295 * Display driver example
296 * ~~~~~~~~~~~~~~~~~~~~~~
297 *
298 * The following example shows a typical structure of a DRM display driver.
299 * The example focus on the probe() function and the other functions that is
300 * almost always present and serves as a demonstration of devm_drm_dev_alloc().
301 *
302 * .. code-block:: c
303 *
304 * struct driver_device {
305 * struct drm_device drm;
306 * void *userspace_facing;
307 * struct clk *pclk;
308 * };
309 *
310 * static const struct drm_driver driver_drm_driver = {
311 * [...]
312 * };
313 *
314 * static int driver_probe(struct platform_device *pdev)
315 * {
316 * struct driver_device *priv;
317 * struct drm_device *drm;
318 * int ret;
319 *
320 * priv = devm_drm_dev_alloc(&pdev->dev, &driver_drm_driver,
321 * struct driver_device, drm);
322 * if (IS_ERR(priv))
323 * return PTR_ERR(priv);
324 * drm = &priv->drm;
325 *
326 * ret = drmm_mode_config_init(drm);
327 * if (ret)
328 * return ret;
329 *
330 * priv->userspace_facing = drmm_kzalloc(..., GFP_KERNEL);
331 * if (!priv->userspace_facing)
332 * return -ENOMEM;
333 *
334 * priv->pclk = devm_clk_get(dev, "PCLK");
335 * if (IS_ERR(priv->pclk))
336 * return PTR_ERR(priv->pclk);
337 *
338 * // Further setup, display pipeline etc
339 *
340 * platform_set_drvdata(pdev, drm);
341 *
342 * drm_mode_config_reset(drm);
343 *
344 * ret = drm_dev_register(drm);
345 * if (ret)
346 * return ret;
347 *
348 * drm_fbdev_generic_setup(drm, 32);
349 *
350 * return 0;
351 * }
352 *
353 * // This function is called before the devm_ resources are released
354 * static int driver_remove(struct platform_device *pdev)
355 * {
356 * struct drm_device *drm = platform_get_drvdata(pdev);
357 *
358 * drm_dev_unregister(drm);
359 * drm_atomic_helper_shutdown(drm)
360 *
361 * return 0;
362 * }
363 *
364 * // This function is called on kernel restart and shutdown
365 * static void driver_shutdown(struct platform_device *pdev)
366 * {
367 * drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
368 * }
369 *
370 * static int __maybe_unused driver_pm_suspend(struct device *dev)
371 * {
372 * return drm_mode_config_helper_suspend(dev_get_drvdata(dev));
373 * }
374 *
375 * static int __maybe_unused driver_pm_resume(struct device *dev)
376 * {
377 * drm_mode_config_helper_resume(dev_get_drvdata(dev));
378 *
379 * return 0;
380 * }
381 *
382 * static const struct dev_pm_ops driver_pm_ops = {
383 * SET_SYSTEM_SLEEP_PM_OPS(driver_pm_suspend, driver_pm_resume)
384 * };
385 *
386 * static struct platform_driver driver_driver = {
387 * .driver = {
388 * [...]
389 * .pm = &driver_pm_ops,
390 * },
391 * .probe = driver_probe,
392 * .remove = driver_remove,
393 * .shutdown = driver_shutdown,
394 * };
395 * module_platform_driver(driver_driver);
396 *
397 * Drivers that want to support device unplugging (USB, DT overlay unload) should
398 * use drm_dev_unplug() instead of drm_dev_unregister(). The driver must protect
399 * regions that is accessing device resources to prevent use after they're
400 * released. This is done using drm_dev_enter() and drm_dev_exit(). There is one
401 * shortcoming however, drm_dev_unplug() marks the drm_device as unplugged before
402 * drm_atomic_helper_shutdown() is called. This means that if the disable code
403 * paths are protected, they will not run on regular driver module unload,
404 * possibly leaving the hardware enabled.
405 */
406
407/**
408 * drm_put_dev - Unregister and release a DRM device
409 * @dev: DRM device
410 *
411 * Called at module unload time or when a PCI device is unplugged.
412 *
413 * Cleans up all DRM device, calling drm_lastclose().
414 *
415 * Note: Use of this function is deprecated. It will eventually go away
416 * completely. Please use drm_dev_unregister() and drm_dev_put() explicitly
417 * instead to make sure that the device isn't userspace accessible any more
418 * while teardown is in progress, ensuring that userspace can't access an
419 * inconsistent state.
420 */
421void drm_put_dev(struct drm_device *dev)
422{
423 DRM_DEBUG("\n");
424
425 if (!dev) {
426 DRM_ERROR("cleanup called no dev\n");
427 return;
428 }
429
430 drm_dev_unregister(dev);
431 drm_dev_put(dev);
432}
433EXPORT_SYMBOL(drm_put_dev);
434
435/**
436 * drm_dev_enter - Enter device critical section
437 * @dev: DRM device
438 * @idx: Pointer to index that will be passed to the matching drm_dev_exit()
439 *
440 * This function marks and protects the beginning of a section that should not
441 * be entered after the device has been unplugged. The section end is marked
442 * with drm_dev_exit(). Calls to this function can be nested.
443 *
444 * Returns:
445 * True if it is OK to enter the section, false otherwise.
446 */
447bool drm_dev_enter(struct drm_device *dev, int *idx)
448{
449 *idx = srcu_read_lock(&drm_unplug_srcu);
450
451 if (dev->unplugged) {
452 srcu_read_unlock(&drm_unplug_srcu, *idx);
453 return false;
454 }
455
456 return true;
457}
458EXPORT_SYMBOL(drm_dev_enter);
459
460/**
461 * drm_dev_exit - Exit device critical section
462 * @idx: index returned from drm_dev_enter()
463 *
464 * This function marks the end of a section that should not be entered after
465 * the device has been unplugged.
466 */
467void drm_dev_exit(int idx)
468{
469 srcu_read_unlock(&drm_unplug_srcu, idx);
470}
471EXPORT_SYMBOL(drm_dev_exit);
472
473/**
474 * drm_dev_unplug - unplug a DRM device
475 * @dev: DRM device
476 *
477 * This unplugs a hotpluggable DRM device, which makes it inaccessible to
478 * userspace operations. Entry-points can use drm_dev_enter() and
479 * drm_dev_exit() to protect device resources in a race free manner. This
480 * essentially unregisters the device like drm_dev_unregister(), but can be
481 * called while there are still open users of @dev.
482 */
483void drm_dev_unplug(struct drm_device *dev)
484{
485 /*
486 * After synchronizing any critical read section is guaranteed to see
487 * the new value of ->unplugged, and any critical section which might
488 * still have seen the old value of ->unplugged is guaranteed to have
489 * finished.
490 */
491 dev->unplugged = true;
492 synchronize_srcu(&drm_unplug_srcu);
493
494 drm_dev_unregister(dev);
495
496 /* Clear all CPU mappings pointing to this device */
497 unmap_mapping_range(dev->anon_inode->i_mapping, 0, 0, 1);
498}
499EXPORT_SYMBOL(drm_dev_unplug);
500
501/*
502 * DRM internal mount
503 * We want to be able to allocate our own "struct address_space" to control
504 * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow
505 * stand-alone address_space objects, so we need an underlying inode. As there
506 * is no way to allocate an independent inode easily, we need a fake internal
507 * VFS mount-point.
508 *
509 * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free()
510 * frees it again. You are allowed to use iget() and iput() to get references to
511 * the inode. But each drm_fs_inode_new() call must be paired with exactly one
512 * drm_fs_inode_free() call (which does not have to be the last iput()).
513 * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it
514 * between multiple inode-users. You could, technically, call
515 * iget() + drm_fs_inode_free() directly after alloc and sometime later do an
516 * iput(), but this way you'd end up with a new vfsmount for each inode.
517 */
518
519static int drm_fs_cnt;
520static struct vfsmount *drm_fs_mnt;
521
522static int drm_fs_init_fs_context(struct fs_context *fc)
523{
524 return init_pseudo(fc, 0x010203ff) ? 0 : -ENOMEM;
525}
526
527static struct file_system_type drm_fs_type = {
528 .name = "drm",
529 .owner = THIS_MODULE,
530 .init_fs_context = drm_fs_init_fs_context,
531 .kill_sb = kill_anon_super,
532};
533
534static struct inode *drm_fs_inode_new(void)
535{
536 struct inode *inode;
537 int r;
538
539 r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt);
540 if (r < 0) {
541 DRM_ERROR("Cannot mount pseudo fs: %d\n", r);
542 return ERR_PTR(r);
543 }
544
545 inode = alloc_anon_inode(drm_fs_mnt->mnt_sb);
546 if (IS_ERR(inode))
547 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
548
549 return inode;
550}
551
552static void drm_fs_inode_free(struct inode *inode)
553{
554 if (inode) {
555 iput(inode);
556 simple_release_fs(&drm_fs_mnt, &drm_fs_cnt);
557 }
558}
559
560/**
561 * DOC: component helper usage recommendations
562 *
563 * DRM drivers that drive hardware where a logical device consists of a pile of
564 * independent hardware blocks are recommended to use the :ref:`component helper
565 * library<component>`. For consistency and better options for code reuse the
566 * following guidelines apply:
567 *
568 * - The entire device initialization procedure should be run from the
569 * &component_master_ops.master_bind callback, starting with
570 * devm_drm_dev_alloc(), then binding all components with
571 * component_bind_all() and finishing with drm_dev_register().
572 *
573 * - The opaque pointer passed to all components through component_bind_all()
574 * should point at &struct drm_device of the device instance, not some driver
575 * specific private structure.
576 *
577 * - The component helper fills the niche where further standardization of
578 * interfaces is not practical. When there already is, or will be, a
579 * standardized interface like &drm_bridge or &drm_panel, providing its own
580 * functions to find such components at driver load time, like
581 * drm_of_find_panel_or_bridge(), then the component helper should not be
582 * used.
583 */
584
585static void drm_dev_init_release(struct drm_device *dev, void *res)
586{
587 drm_fs_inode_free(dev->anon_inode);
588
589 put_device(dev->dev);
590 /* Prevent use-after-free in drm_managed_release when debugging is
591 * enabled. Slightly awkward, but can't really be helped. */
592 dev->dev = NULL;
593 mutex_destroy(&dev->master_mutex);
594 mutex_destroy(&dev->clientlist_mutex);
595 mutex_destroy(&dev->filelist_mutex);
596 mutex_destroy(&dev->struct_mutex);
597}
598
599static int drm_dev_init(struct drm_device *dev,
600 const struct drm_driver *driver,
601 struct device *parent)
602{
603 struct inode *inode;
604 int ret;
605
606 if (!drm_core_init_complete) {
607 DRM_ERROR("DRM core is not initialized\n");
608 return -ENODEV;
609 }
610
611 if (WARN_ON(!parent))
612 return -EINVAL;
613
614 kref_init(&dev->ref);
615 dev->dev = get_device(parent);
616 dev->driver = driver;
617
618 INIT_LIST_HEAD(&dev->managed.resources);
619 spin_lock_init(&dev->managed.lock);
620
621 /* no per-device feature limits by default */
622 dev->driver_features = ~0u;
623
624 if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL) &&
625 (drm_core_check_feature(dev, DRIVER_RENDER) ||
626 drm_core_check_feature(dev, DRIVER_MODESET))) {
627 DRM_ERROR("DRM driver can't be both a compute acceleration and graphics driver\n");
628 return -EINVAL;
629 }
630
631 INIT_LIST_HEAD(&dev->filelist);
632 INIT_LIST_HEAD(&dev->filelist_internal);
633 INIT_LIST_HEAD(&dev->clientlist);
634 INIT_LIST_HEAD(&dev->vblank_event_list);
635
636 spin_lock_init(&dev->event_lock);
637 mutex_init(&dev->struct_mutex);
638 mutex_init(&dev->filelist_mutex);
639 mutex_init(&dev->clientlist_mutex);
640 mutex_init(&dev->master_mutex);
641
642 ret = drmm_add_action_or_reset(dev, drm_dev_init_release, NULL);
643 if (ret)
644 return ret;
645
646 inode = drm_fs_inode_new();
647 if (IS_ERR(inode)) {
648 ret = PTR_ERR(inode);
649 DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret);
650 goto err;
651 }
652
653 dev->anon_inode = inode;
654
655 if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL)) {
656 ret = drm_minor_alloc(dev, DRM_MINOR_ACCEL);
657 if (ret)
658 goto err;
659 } else {
660 if (drm_core_check_feature(dev, DRIVER_RENDER)) {
661 ret = drm_minor_alloc(dev, DRM_MINOR_RENDER);
662 if (ret)
663 goto err;
664 }
665
666 ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY);
667 if (ret)
668 goto err;
669 }
670
671 if (drm_core_check_feature(dev, DRIVER_GEM)) {
672 ret = drm_gem_init(dev);
673 if (ret) {
674 DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n");
675 goto err;
676 }
677 }
678
679 dev->unique = drmm_kstrdup(dev, dev_name(parent), GFP_KERNEL);
680 if (!dev->unique) {
681 ret = -ENOMEM;
682 goto err;
683 }
684
685 if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL))
686 accel_debugfs_init(dev);
687 else
688 drm_debugfs_dev_init(dev, drm_debugfs_root);
689
690 return 0;
691
692err:
693 drm_managed_release(dev);
694
695 return ret;
696}
697
698static void devm_drm_dev_init_release(void *data)
699{
700 drm_dev_put(data);
701}
702
703static int devm_drm_dev_init(struct device *parent,
704 struct drm_device *dev,
705 const struct drm_driver *driver)
706{
707 int ret;
708
709 ret = drm_dev_init(dev, driver, parent);
710 if (ret)
711 return ret;
712
713 return devm_add_action_or_reset(parent,
714 devm_drm_dev_init_release, dev);
715}
716
717void *__devm_drm_dev_alloc(struct device *parent,
718 const struct drm_driver *driver,
719 size_t size, size_t offset)
720{
721 void *container;
722 struct drm_device *drm;
723 int ret;
724
725 container = kzalloc(size, GFP_KERNEL);
726 if (!container)
727 return ERR_PTR(-ENOMEM);
728
729 drm = container + offset;
730 ret = devm_drm_dev_init(parent, drm, driver);
731 if (ret) {
732 kfree(container);
733 return ERR_PTR(ret);
734 }
735 drmm_add_final_kfree(drm, container);
736
737 return container;
738}
739EXPORT_SYMBOL(__devm_drm_dev_alloc);
740
741/**
742 * drm_dev_alloc - Allocate new DRM device
743 * @driver: DRM driver to allocate device for
744 * @parent: Parent device object
745 *
746 * This is the deprecated version of devm_drm_dev_alloc(), which does not support
747 * subclassing through embedding the struct &drm_device in a driver private
748 * structure, and which does not support automatic cleanup through devres.
749 *
750 * RETURNS:
751 * Pointer to new DRM device, or ERR_PTR on failure.
752 */
753struct drm_device *drm_dev_alloc(const struct drm_driver *driver,
754 struct device *parent)
755{
756 struct drm_device *dev;
757 int ret;
758
759 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
760 if (!dev)
761 return ERR_PTR(-ENOMEM);
762
763 ret = drm_dev_init(dev, driver, parent);
764 if (ret) {
765 kfree(dev);
766 return ERR_PTR(ret);
767 }
768
769 drmm_add_final_kfree(dev, dev);
770
771 return dev;
772}
773EXPORT_SYMBOL(drm_dev_alloc);
774
775static void drm_dev_release(struct kref *ref)
776{
777 struct drm_device *dev = container_of(ref, struct drm_device, ref);
778
779 /* Just in case register/unregister was never called */
780 drm_debugfs_dev_fini(dev);
781
782 if (dev->driver->release)
783 dev->driver->release(dev);
784
785 drm_managed_release(dev);
786
787 kfree(dev->managed.final_kfree);
788}
789
790/**
791 * drm_dev_get - Take reference of a DRM device
792 * @dev: device to take reference of or NULL
793 *
794 * This increases the ref-count of @dev by one. You *must* already own a
795 * reference when calling this. Use drm_dev_put() to drop this reference
796 * again.
797 *
798 * This function never fails. However, this function does not provide *any*
799 * guarantee whether the device is alive or running. It only provides a
800 * reference to the object and the memory associated with it.
801 */
802void drm_dev_get(struct drm_device *dev)
803{
804 if (dev)
805 kref_get(&dev->ref);
806}
807EXPORT_SYMBOL(drm_dev_get);
808
809/**
810 * drm_dev_put - Drop reference of a DRM device
811 * @dev: device to drop reference of or NULL
812 *
813 * This decreases the ref-count of @dev by one. The device is destroyed if the
814 * ref-count drops to zero.
815 */
816void drm_dev_put(struct drm_device *dev)
817{
818 if (dev)
819 kref_put(&dev->ref, drm_dev_release);
820}
821EXPORT_SYMBOL(drm_dev_put);
822
823static int create_compat_control_link(struct drm_device *dev)
824{
825 struct drm_minor *minor;
826 char *name;
827 int ret;
828
829 if (!drm_core_check_feature(dev, DRIVER_MODESET))
830 return 0;
831
832 minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
833 if (!minor)
834 return 0;
835
836 /*
837 * Some existing userspace out there uses the existing of the controlD*
838 * sysfs files to figure out whether it's a modeset driver. It only does
839 * readdir, hence a symlink is sufficient (and the least confusing
840 * option). Otherwise controlD* is entirely unused.
841 *
842 * Old controlD chardev have been allocated in the range
843 * 64-127.
844 */
845 name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64);
846 if (!name)
847 return -ENOMEM;
848
849 ret = sysfs_create_link(minor->kdev->kobj.parent,
850 &minor->kdev->kobj,
851 name);
852
853 kfree(name);
854
855 return ret;
856}
857
858static void remove_compat_control_link(struct drm_device *dev)
859{
860 struct drm_minor *minor;
861 char *name;
862
863 if (!drm_core_check_feature(dev, DRIVER_MODESET))
864 return;
865
866 minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY);
867 if (!minor)
868 return;
869
870 name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64);
871 if (!name)
872 return;
873
874 sysfs_remove_link(minor->kdev->kobj.parent, name);
875
876 kfree(name);
877}
878
879/**
880 * drm_dev_register - Register DRM device
881 * @dev: Device to register
882 * @flags: Flags passed to the driver's .load() function
883 *
884 * Register the DRM device @dev with the system, advertise device to user-space
885 * and start normal device operation. @dev must be initialized via drm_dev_init()
886 * previously.
887 *
888 * Never call this twice on any device!
889 *
890 * NOTE: To ensure backward compatibility with existing drivers method this
891 * function calls the &drm_driver.load method after registering the device
892 * nodes, creating race conditions. Usage of the &drm_driver.load methods is
893 * therefore deprecated, drivers must perform all initialization before calling
894 * drm_dev_register().
895 *
896 * RETURNS:
897 * 0 on success, negative error code on failure.
898 */
899int drm_dev_register(struct drm_device *dev, unsigned long flags)
900{
901 const struct drm_driver *driver = dev->driver;
902 int ret;
903
904 if (!driver->load)
905 drm_mode_config_validate(dev);
906
907 WARN_ON(!dev->managed.final_kfree);
908
909 if (drm_dev_needs_global_mutex(dev))
910 mutex_lock(&drm_global_mutex);
911
912 if (drm_core_check_feature(dev, DRIVER_COMPUTE_ACCEL))
913 accel_debugfs_register(dev);
914 else
915 drm_debugfs_dev_register(dev);
916
917 ret = drm_minor_register(dev, DRM_MINOR_RENDER);
918 if (ret)
919 goto err_minors;
920
921 ret = drm_minor_register(dev, DRM_MINOR_PRIMARY);
922 if (ret)
923 goto err_minors;
924
925 ret = drm_minor_register(dev, DRM_MINOR_ACCEL);
926 if (ret)
927 goto err_minors;
928
929 ret = create_compat_control_link(dev);
930 if (ret)
931 goto err_minors;
932
933 dev->registered = true;
934
935 if (driver->load) {
936 ret = driver->load(dev, flags);
937 if (ret)
938 goto err_minors;
939 }
940
941 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
942 ret = drm_modeset_register_all(dev);
943 if (ret)
944 goto err_unload;
945 }
946
947 DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
948 driver->name, driver->major, driver->minor,
949 driver->patchlevel, driver->date,
950 dev->dev ? dev_name(dev->dev) : "virtual device",
951 dev->primary ? dev->primary->index : dev->accel->index);
952
953 goto out_unlock;
954
955err_unload:
956 if (dev->driver->unload)
957 dev->driver->unload(dev);
958err_minors:
959 remove_compat_control_link(dev);
960 drm_minor_unregister(dev, DRM_MINOR_ACCEL);
961 drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
962 drm_minor_unregister(dev, DRM_MINOR_RENDER);
963out_unlock:
964 if (drm_dev_needs_global_mutex(dev))
965 mutex_unlock(&drm_global_mutex);
966 return ret;
967}
968EXPORT_SYMBOL(drm_dev_register);
969
970/**
971 * drm_dev_unregister - Unregister DRM device
972 * @dev: Device to unregister
973 *
974 * Unregister the DRM device from the system. This does the reverse of
975 * drm_dev_register() but does not deallocate the device. The caller must call
976 * drm_dev_put() to drop their final reference, unless it is managed with devres
977 * (as devices allocated with devm_drm_dev_alloc() are), in which case there is
978 * already an unwind action registered.
979 *
980 * A special form of unregistering for hotpluggable devices is drm_dev_unplug(),
981 * which can be called while there are still open users of @dev.
982 *
983 * This should be called first in the device teardown code to make sure
984 * userspace can't access the device instance any more.
985 */
986void drm_dev_unregister(struct drm_device *dev)
987{
988 dev->registered = false;
989
990 drm_client_dev_unregister(dev);
991
992 if (drm_core_check_feature(dev, DRIVER_MODESET))
993 drm_modeset_unregister_all(dev);
994
995 if (dev->driver->unload)
996 dev->driver->unload(dev);
997
998 remove_compat_control_link(dev);
999 drm_minor_unregister(dev, DRM_MINOR_ACCEL);
1000 drm_minor_unregister(dev, DRM_MINOR_PRIMARY);
1001 drm_minor_unregister(dev, DRM_MINOR_RENDER);
1002 drm_debugfs_dev_fini(dev);
1003}
1004EXPORT_SYMBOL(drm_dev_unregister);
1005
1006/*
1007 * DRM Core
1008 * The DRM core module initializes all global DRM objects and makes them
1009 * available to drivers. Once setup, drivers can probe their respective
1010 * devices.
1011 * Currently, core management includes:
1012 * - The "DRM-Global" key/value database
1013 * - Global ID management for connectors
1014 * - DRM major number allocation
1015 * - DRM minor management
1016 * - DRM sysfs class
1017 * - DRM debugfs root
1018 *
1019 * Furthermore, the DRM core provides dynamic char-dev lookups. For each
1020 * interface registered on a DRM device, you can request minor numbers from DRM
1021 * core. DRM core takes care of major-number management and char-dev
1022 * registration. A stub ->open() callback forwards any open() requests to the
1023 * registered minor.
1024 */
1025
1026static int drm_stub_open(struct inode *inode, struct file *filp)
1027{
1028 const struct file_operations *new_fops;
1029 struct drm_minor *minor;
1030 int err;
1031
1032 DRM_DEBUG("\n");
1033
1034 minor = drm_minor_acquire(iminor(inode));
1035 if (IS_ERR(minor))
1036 return PTR_ERR(minor);
1037
1038 new_fops = fops_get(minor->dev->driver->fops);
1039 if (!new_fops) {
1040 err = -ENODEV;
1041 goto out;
1042 }
1043
1044 replace_fops(filp, new_fops);
1045 if (filp->f_op->open)
1046 err = filp->f_op->open(inode, filp);
1047 else
1048 err = 0;
1049
1050out:
1051 drm_minor_release(minor);
1052
1053 return err;
1054}
1055
1056static const struct file_operations drm_stub_fops = {
1057 .owner = THIS_MODULE,
1058 .open = drm_stub_open,
1059 .llseek = noop_llseek,
1060};
1061
1062static void drm_core_exit(void)
1063{
1064 drm_privacy_screen_lookup_exit();
1065 accel_core_exit();
1066 unregister_chrdev(DRM_MAJOR, "drm");
1067 debugfs_remove(drm_debugfs_root);
1068 drm_sysfs_destroy();
1069 idr_destroy(&drm_minors_idr);
1070 drm_connector_ida_destroy();
1071}
1072
1073static int __init drm_core_init(void)
1074{
1075 int ret;
1076
1077 drm_connector_ida_init();
1078 idr_init(&drm_minors_idr);
1079 drm_memcpy_init_early();
1080
1081 ret = drm_sysfs_init();
1082 if (ret < 0) {
1083 DRM_ERROR("Cannot create DRM class: %d\n", ret);
1084 goto error;
1085 }
1086
1087 drm_debugfs_root = debugfs_create_dir("dri", NULL);
1088
1089 ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops);
1090 if (ret < 0)
1091 goto error;
1092
1093 ret = accel_core_init();
1094 if (ret < 0)
1095 goto error;
1096
1097 drm_privacy_screen_lookup_init();
1098
1099 drm_core_init_complete = true;
1100
1101 DRM_DEBUG("Initialized\n");
1102 return 0;
1103
1104error:
1105 drm_core_exit();
1106 return ret;
1107}
1108
1109module_init(drm_core_init);
1110module_exit(drm_core_exit);