1/*
2 * Created: Sun Dec 21 13:08:50 2008 by bgamari@gmail.com
3 *
4 * Copyright 2008 Ben Gamari <bgamari@gmail.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26#include <linux/debugfs.h>
27#include <linux/export.h>
28#include <linux/seq_file.h>
29#include <linux/slab.h>
30#include <linux/uaccess.h>
31
32#include <drm/drm_atomic.h>
33#include <drm/drm_auth.h>
34#include <drm/drm_bridge.h>
35#include <drm/drm_debugfs.h>
36#include <drm/drm_device.h>
37#include <drm/drm_drv.h>
38#include <drm/drm_edid.h>
39#include <drm/drm_file.h>
40#include <drm/drm_gem.h>
41#include <drm/drm_managed.h>
42#include <drm/drm_gpuvm.h>
43
44#include "drm_crtc_internal.h"
45#include "drm_internal.h"
46
47static struct dentry *accel_debugfs_root;
48static struct dentry *drm_debugfs_root;
49
50/***************************************************
51 * Initialization, etc.
52 **************************************************/
53
54static int drm_name_info(struct seq_file *m, void *data)
55{
56 struct drm_debugfs_entry *entry = m->private;
57 struct drm_device *dev = entry->dev;
58 struct drm_master *master;
59
60 mutex_lock(&dev->master_mutex);
61 master = dev->master;
62 seq_printf(m, fmt: "%s", dev->driver->name);
63 if (dev->dev)
64 seq_printf(m, fmt: " dev=%s", dev_name(dev: dev->dev));
65 if (master && master->unique)
66 seq_printf(m, fmt: " master=%s", master->unique);
67 if (dev->unique)
68 seq_printf(m, fmt: " unique=%s", dev->unique);
69 seq_printf(m, fmt: "\n");
70 mutex_unlock(lock: &dev->master_mutex);
71
72 return 0;
73}
74
75static int drm_clients_info(struct seq_file *m, void *data)
76{
77 struct drm_debugfs_entry *entry = m->private;
78 struct drm_device *dev = entry->dev;
79 struct drm_file *priv;
80 kuid_t uid;
81
82 seq_printf(m,
83 fmt: "%20s %5s %3s master a %5s %10s %*s %20s\n",
84 "command",
85 "tgid",
86 "dev",
87 "uid",
88 "magic",
89 DRM_CLIENT_NAME_MAX_LEN,
90 "name",
91 "id");
92
93 /* dev->filelist is sorted youngest first, but we want to present
94 * oldest first (i.e. kernel, servers, clients), so walk backwardss.
95 */
96 mutex_lock(&dev->filelist_mutex);
97 list_for_each_entry_reverse(priv, &dev->filelist, lhead) {
98 bool is_current_master = drm_is_current_master(fpriv: priv);
99 struct task_struct *task;
100 struct pid *pid;
101
102 mutex_lock(&priv->client_name_lock);
103 rcu_read_lock(); /* Locks priv->pid and pid_task()->comm! */
104 pid = rcu_dereference(priv->pid);
105 task = pid_task(pid, PIDTYPE_TGID);
106 uid = task ? __task_cred(task)->euid : GLOBAL_ROOT_UID;
107 seq_printf(m, "%20s %5d %3d %c %c %5d %10u %*s %20llu\n",
108 task ? task->comm : "<unknown>",
109 pid_vnr(pid),
110 priv->minor->index,
111 is_current_master ? 'y' : 'n',
112 priv->authenticated ? 'y' : 'n',
113 from_kuid_munged(seq_user_ns(m), uid),
114 priv->magic,
115 DRM_CLIENT_NAME_MAX_LEN,
116 priv->client_name ? priv->client_name : "<unset>",
117 priv->client_id);
118 rcu_read_unlock();
119 mutex_unlock(&priv->client_name_lock);
120 }
121 mutex_unlock(&dev->filelist_mutex);
122 return 0;
123}
124
125static int drm_gem_one_name_info(int id, void *ptr, void *data)
126{
127 struct drm_gem_object *obj = ptr;
128 struct seq_file *m = data;
129
130 seq_printf(m, fmt: "%6d %8zd %7d %8d\n",
131 obj->name, obj->size,
132 obj->handle_count,
133 kref_read(kref: &obj->refcount));
134 return 0;
135}
136
137static int drm_gem_name_info(struct seq_file *m, void *data)
138{
139 struct drm_debugfs_entry *entry = m->private;
140 struct drm_device *dev = entry->dev;
141
142 seq_printf(m, fmt: " name size handles refcount\n");
143
144 mutex_lock(&dev->object_name_lock);
145 idr_for_each(&dev->object_name_idr, fn: drm_gem_one_name_info, data: m);
146 mutex_unlock(lock: &dev->object_name_lock);
147
148 return 0;
149}
150
151static const struct drm_debugfs_info drm_debugfs_list[] = {
152 {"name", drm_name_info, 0},
153 {"clients", drm_clients_info, 0},
154 {"gem_names", drm_gem_name_info, DRIVER_GEM},
155};
156#define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
157
158
159static int drm_debugfs_open(struct inode *inode, struct file *file)
160{
161 struct drm_info_node *node = inode->i_private;
162
163 if (!device_is_registered(dev: node->minor->kdev))
164 return -ENODEV;
165
166 return single_open(file, node->info_ent->show, node);
167}
168
169static int drm_debugfs_entry_open(struct inode *inode, struct file *file)
170{
171 struct drm_debugfs_entry *entry = inode->i_private;
172 struct drm_debugfs_info *node = &entry->file;
173 struct drm_minor *minor = entry->dev->primary ?: entry->dev->accel;
174
175 if (!device_is_registered(dev: minor->kdev))
176 return -ENODEV;
177
178 return single_open(file, node->show, entry);
179}
180
181static const struct file_operations drm_debugfs_entry_fops = {
182 .owner = THIS_MODULE,
183 .open = drm_debugfs_entry_open,
184 .read = seq_read,
185 .llseek = seq_lseek,
186 .release = single_release,
187};
188
189static const struct file_operations drm_debugfs_fops = {
190 .owner = THIS_MODULE,
191 .open = drm_debugfs_open,
192 .read = seq_read,
193 .llseek = seq_lseek,
194 .release = single_release,
195};
196
197/**
198 * drm_debugfs_gpuva_info - dump the given DRM GPU VA space
199 * @m: pointer to the &seq_file to write
200 * @gpuvm: the &drm_gpuvm representing the GPU VA space
201 *
202 * Dumps the GPU VA mappings of a given DRM GPU VA manager.
203 *
204 * For each DRM GPU VA space drivers should call this function from their
205 * &drm_info_list's show callback.
206 *
207 * Returns: 0 on success, -ENODEV if the &gpuvm is not initialized
208 */
209int drm_debugfs_gpuva_info(struct seq_file *m,
210 struct drm_gpuvm *gpuvm)
211{
212 struct drm_gpuva *va, *kva = &gpuvm->kernel_alloc_node;
213
214 if (!gpuvm->name)
215 return -ENODEV;
216
217 seq_printf(m, fmt: "DRM GPU VA space (%s) [0x%016llx;0x%016llx]\n",
218 gpuvm->name, gpuvm->mm_start, gpuvm->mm_start + gpuvm->mm_range);
219 seq_printf(m, fmt: "Kernel reserved node [0x%016llx;0x%016llx]\n",
220 kva->va.addr, kva->va.addr + kva->va.range);
221 seq_puts(m, s: "\n");
222 seq_puts(m, s: " VAs | start | range | end | object | object offset\n");
223 seq_puts(m, s: "-------------------------------------------------------------------------------------------------------------\n");
224 drm_gpuvm_for_each_va(va, gpuvm) {
225 if (unlikely(va == kva))
226 continue;
227
228 seq_printf(m, fmt: " | 0x%016llx | 0x%016llx | 0x%016llx | 0x%016llx | 0x%016llx\n",
229 va->va.addr, va->va.range, va->va.addr + va->va.range,
230 (u64)(uintptr_t)va->gem.obj, va->gem.offset);
231 }
232
233 return 0;
234}
235EXPORT_SYMBOL(drm_debugfs_gpuva_info);
236
237/**
238 * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
239 * minor
240 * @files: The array of files to create
241 * @count: The number of files given
242 * @root: DRI debugfs dir entry.
243 * @minor: device minor number
244 *
245 * Create a given set of debugfs files represented by an array of
246 * &struct drm_info_list in the given root directory. These files will be removed
247 * automatically on drm_debugfs_dev_fini().
248 */
249void drm_debugfs_create_files(const struct drm_info_list *files, int count,
250 struct dentry *root, struct drm_minor *minor)
251{
252 struct drm_device *dev = minor->dev;
253 struct drm_info_node *tmp;
254 int i;
255
256 for (i = 0; i < count; i++) {
257 u32 features = files[i].driver_features;
258
259 if (features && !drm_core_check_all_features(dev, features))
260 continue;
261
262 tmp = drmm_kzalloc(dev, size: sizeof(*tmp), GFP_KERNEL);
263 if (tmp == NULL)
264 continue;
265
266 tmp->minor = minor;
267 tmp->dent = debugfs_create_file(files[i].name,
268 0444, root, tmp,
269 &drm_debugfs_fops);
270 tmp->info_ent = &files[i];
271 }
272}
273EXPORT_SYMBOL(drm_debugfs_create_files);
274
275int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
276 struct dentry *root, struct drm_minor *minor)
277{
278 int i;
279
280 for (i = 0; i < count; i++) {
281 struct dentry *dent = debugfs_lookup(name: files[i].name, parent: root);
282
283 if (!dent)
284 continue;
285
286 drmm_kfree(dev: minor->dev, data: d_inode(dentry: dent)->i_private);
287 debugfs_remove(dentry: dent);
288 }
289 return 0;
290}
291EXPORT_SYMBOL(drm_debugfs_remove_files);
292
293void drm_debugfs_bridge_params(void)
294{
295 drm_bridge_debugfs_params(root: drm_debugfs_root);
296}
297
298void drm_debugfs_init_root(void)
299{
300 drm_debugfs_root = debugfs_create_dir(name: "dri", NULL);
301#if IS_ENABLED(CONFIG_DRM_ACCEL)
302 accel_debugfs_root = debugfs_create_dir(name: "accel", NULL);
303#endif
304}
305
306void drm_debugfs_remove_root(void)
307{
308#if IS_ENABLED(CONFIG_DRM_ACCEL)
309 debugfs_remove(dentry: accel_debugfs_root);
310#endif
311 debugfs_remove(dentry: drm_debugfs_root);
312}
313
314static int drm_debugfs_proc_info_show(struct seq_file *m, void *unused)
315{
316 struct pid *pid;
317 struct task_struct *task;
318 struct drm_file *file = m->private;
319
320 if (!file)
321 return -EINVAL;
322
323 rcu_read_lock();
324 pid = rcu_dereference(file->pid);
325 task = pid_task(pid, PIDTYPE_TGID);
326
327 seq_printf(m, fmt: "pid: %d\n", task ? task->pid : 0);
328 seq_printf(m, fmt: "comm: %s\n", task ? task->comm : "Unset");
329 rcu_read_unlock();
330 return 0;
331}
332
333static int drm_debufs_proc_info_open(struct inode *inode, struct file *file)
334{
335 return single_open(file, drm_debugfs_proc_info_show, inode->i_private);
336}
337
338static const struct file_operations drm_debugfs_proc_info_fops = {
339 .owner = THIS_MODULE,
340 .open = drm_debufs_proc_info_open,
341 .read = seq_read,
342 .llseek = seq_lseek,
343 .release = single_release,
344};
345
346/**
347 * drm_debugfs_clients_add - Add a per client debugfs directory
348 * @file: drm_file for a client
349 *
350 * Create the debugfs directory for each client. This will be used to populate
351 * driver specific data for each client.
352 *
353 * Also add the process information debugfs file for each client to tag
354 * which client belongs to which process.
355 */
356void drm_debugfs_clients_add(struct drm_file *file)
357{
358 char *client;
359
360 client = kasprintf(GFP_KERNEL, fmt: "client-%llu", file->client_id);
361 if (!client)
362 return;
363
364 /* Create a debugfs directory for the client in root on drm debugfs */
365 file->debugfs_client = debugfs_create_dir(name: client, parent: drm_debugfs_root);
366 kfree(objp: client);
367
368 debugfs_create_file("proc_info", 0444, file->debugfs_client, file,
369 &drm_debugfs_proc_info_fops);
370
371 client = kasprintf(GFP_KERNEL, fmt: "../%s", file->minor->dev->unique);
372 if (!client)
373 return;
374
375 /* Create a link from client_id to the drm device this client id belongs to */
376 debugfs_create_symlink(name: "device", parent: file->debugfs_client, dest: client);
377 kfree(objp: client);
378}
379
380/**
381 * drm_debugfs_clients_remove - removes all debugfs directories and files
382 * @file: drm_file for a client
383 *
384 * Removes the debugfs directories recursively from the client directory.
385 *
386 * There is also a possibility that debugfs files are open while the drm_file
387 * is released.
388 */
389void drm_debugfs_clients_remove(struct drm_file *file)
390{
391 debugfs_remove_recursive(dentry: file->debugfs_client);
392 file->debugfs_client = NULL;
393}
394
395/**
396 * drm_debugfs_dev_init - create debugfs directory for the device
397 * @dev: the device which we want to create the directory for
398 *
399 * Creates the debugfs directory for the device under the given root directory.
400 */
401void drm_debugfs_dev_init(struct drm_device *dev)
402{
403 if (drm_core_check_feature(dev, feature: DRIVER_COMPUTE_ACCEL))
404 dev->debugfs_root = debugfs_create_dir(name: dev->unique, parent: accel_debugfs_root);
405 else
406 dev->debugfs_root = debugfs_create_dir(name: dev->unique, parent: drm_debugfs_root);
407}
408
409/**
410 * drm_debugfs_dev_fini - cleanup debugfs directory
411 * @dev: the device to cleanup the debugfs stuff
412 *
413 * Remove the debugfs directory, might be called multiple times.
414 */
415void drm_debugfs_dev_fini(struct drm_device *dev)
416{
417 debugfs_remove_recursive(dentry: dev->debugfs_root);
418 dev->debugfs_root = NULL;
419}
420
421void drm_debugfs_dev_register(struct drm_device *dev)
422{
423 drm_debugfs_add_files(dev, files: drm_debugfs_list, DRM_DEBUGFS_ENTRIES);
424
425 if (drm_core_check_feature(dev, feature: DRIVER_MODESET)) {
426 drm_framebuffer_debugfs_init(dev);
427 drm_client_debugfs_init(dev);
428 }
429 if (drm_drv_uses_atomic_modeset(dev))
430 drm_atomic_debugfs_init(dev);
431}
432
433int drm_debugfs_register(struct drm_minor *minor, int minor_id)
434{
435 struct drm_device *dev = minor->dev;
436 char name[64];
437
438 sprintf(buf: name, fmt: "%d", minor_id);
439 minor->debugfs_symlink = debugfs_create_symlink(name, parent: drm_debugfs_root,
440 dest: dev->unique);
441
442 /* TODO: Only for compatibility with drivers */
443 minor->debugfs_root = dev->debugfs_root;
444
445 if (dev->driver->debugfs_init && dev->render != minor)
446 dev->driver->debugfs_init(minor);
447
448 return 0;
449}
450
451void drm_debugfs_unregister(struct drm_minor *minor)
452{
453 debugfs_remove(dentry: minor->debugfs_symlink);
454 minor->debugfs_symlink = NULL;
455}
456
457/**
458 * drm_debugfs_add_file - Add a given file to the DRM device debugfs file list
459 * @dev: drm device for the ioctl
460 * @name: debugfs file name
461 * @show: show callback
462 * @data: driver-private data, should not be device-specific
463 *
464 * Add a given file entry to the DRM device debugfs file list to be created on
465 * drm_debugfs_init.
466 */
467void drm_debugfs_add_file(struct drm_device *dev, const char *name,
468 int (*show)(struct seq_file*, void*), void *data)
469{
470 struct drm_debugfs_entry *entry = drmm_kzalloc(dev, size: sizeof(*entry), GFP_KERNEL);
471
472 if (!entry)
473 return;
474
475 entry->file.name = name;
476 entry->file.show = show;
477 entry->file.data = data;
478 entry->dev = dev;
479
480 debugfs_create_file(name, 0444, dev->debugfs_root, entry,
481 &drm_debugfs_entry_fops);
482}
483EXPORT_SYMBOL(drm_debugfs_add_file);
484
485/**
486 * drm_debugfs_add_files - Add an array of files to the DRM device debugfs file list
487 * @dev: drm device for the ioctl
488 * @files: The array of files to create
489 * @count: The number of files given
490 *
491 * Add a given set of debugfs files represented by an array of
492 * &struct drm_debugfs_info in the DRM device debugfs file list.
493 */
494void drm_debugfs_add_files(struct drm_device *dev, const struct drm_debugfs_info *files, int count)
495{
496 int i;
497
498 for (i = 0; i < count; i++)
499 drm_debugfs_add_file(dev, files[i].name, files[i].show, files[i].data);
500}
501EXPORT_SYMBOL(drm_debugfs_add_files);
502
503static int connector_show(struct seq_file *m, void *data)
504{
505 struct drm_connector *connector = m->private;
506
507 seq_printf(m, fmt: "%s\n", drm_get_connector_force_name(force: connector->force));
508
509 return 0;
510}
511
512static int connector_open(struct inode *inode, struct file *file)
513{
514 struct drm_connector *dev = inode->i_private;
515
516 return single_open(file, connector_show, dev);
517}
518
519static ssize_t connector_write(struct file *file, const char __user *ubuf,
520 size_t len, loff_t *offp)
521{
522 struct seq_file *m = file->private_data;
523 struct drm_connector *connector = m->private;
524 char buf[12];
525
526 if (len > sizeof(buf) - 1)
527 return -EINVAL;
528
529 if (copy_from_user(to: buf, from: ubuf, n: len))
530 return -EFAULT;
531
532 buf[len] = '\0';
533
534 if (sysfs_streq(s1: buf, s2: "on"))
535 connector->force = DRM_FORCE_ON;
536 else if (sysfs_streq(s1: buf, s2: "digital"))
537 connector->force = DRM_FORCE_ON_DIGITAL;
538 else if (sysfs_streq(s1: buf, s2: "off"))
539 connector->force = DRM_FORCE_OFF;
540 else if (sysfs_streq(s1: buf, s2: "unspecified"))
541 connector->force = DRM_FORCE_UNSPECIFIED;
542 else
543 return -EINVAL;
544
545 return len;
546}
547
548static int edid_show(struct seq_file *m, void *data)
549{
550 return drm_edid_override_show(connector: m->private, m);
551}
552
553static int edid_open(struct inode *inode, struct file *file)
554{
555 struct drm_connector *dev = inode->i_private;
556
557 return single_open(file, edid_show, dev);
558}
559
560static ssize_t edid_write(struct file *file, const char __user *ubuf,
561 size_t len, loff_t *offp)
562{
563 struct seq_file *m = file->private_data;
564 struct drm_connector *connector = m->private;
565 char *buf;
566 int ret;
567
568 buf = memdup_user(ubuf, len);
569 if (IS_ERR(ptr: buf))
570 return PTR_ERR(ptr: buf);
571
572 if (len == 5 && !strncmp(buf, "reset", 5))
573 ret = drm_edid_override_reset(connector);
574 else
575 ret = drm_edid_override_set(connector, edid: buf, size: len);
576
577 kfree(objp: buf);
578
579 return ret ? ret : len;
580}
581
582/*
583 * Returns the min and max vrr vfreq through the connector's debugfs file.
584 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range
585 */
586static int vrr_range_show(struct seq_file *m, void *data)
587{
588 struct drm_connector *connector = m->private;
589
590 if (connector->status != connector_status_connected)
591 return -ENODEV;
592
593 seq_printf(m, fmt: "Min: %u\n", connector->display_info.monitor_range.min_vfreq);
594 seq_printf(m, fmt: "Max: %u\n", connector->display_info.monitor_range.max_vfreq);
595
596 return 0;
597}
598DEFINE_SHOW_ATTRIBUTE(vrr_range);
599
600/*
601 * Returns Connector's max supported bpc through debugfs file.
602 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
603 */
604static int output_bpc_show(struct seq_file *m, void *data)
605{
606 struct drm_connector *connector = m->private;
607
608 if (connector->status != connector_status_connected)
609 return -ENODEV;
610
611 seq_printf(m, fmt: "Maximum: %u\n", connector->display_info.bpc);
612
613 return 0;
614}
615DEFINE_SHOW_ATTRIBUTE(output_bpc);
616
617static const struct file_operations drm_edid_fops = {
618 .owner = THIS_MODULE,
619 .open = edid_open,
620 .read = seq_read,
621 .llseek = seq_lseek,
622 .release = single_release,
623 .write = edid_write
624};
625
626
627static const struct file_operations drm_connector_fops = {
628 .owner = THIS_MODULE,
629 .open = connector_open,
630 .read = seq_read,
631 .llseek = seq_lseek,
632 .release = single_release,
633 .write = connector_write
634};
635
636static ssize_t
637audio_infoframe_read(struct file *filp, char __user *ubuf, size_t count, loff_t *ppos)
638{
639 struct drm_connector_hdmi_infoframe *infoframe;
640 struct drm_connector *connector;
641 union hdmi_infoframe *frame;
642 u8 buf[HDMI_INFOFRAME_SIZE(AUDIO)];
643 ssize_t len = 0;
644
645 connector = filp->private_data;
646 mutex_lock(&connector->hdmi.infoframes.lock);
647
648 infoframe = &connector->hdmi.infoframes.audio;
649 if (!infoframe->set)
650 goto out;
651
652 frame = &infoframe->data;
653 len = hdmi_infoframe_pack(frame, buffer: buf, size: sizeof(buf));
654 if (len < 0)
655 goto out;
656
657 len = simple_read_from_buffer(to: ubuf, count, ppos, from: buf, available: len);
658
659out:
660 mutex_unlock(lock: &connector->hdmi.infoframes.lock);
661 return len;
662}
663
664static const struct file_operations audio_infoframe_fops = {
665 .owner = THIS_MODULE,
666 .open = simple_open,
667 .read = audio_infoframe_read,
668};
669
670static int create_hdmi_audio_infoframe_file(struct drm_connector *connector,
671 struct dentry *parent)
672{
673 struct dentry *file;
674
675 file = debugfs_create_file("audio", 0400, parent, connector, &audio_infoframe_fops);
676 if (IS_ERR(ptr: file))
677 return PTR_ERR(ptr: file);
678
679 return 0;
680}
681
682#define DEFINE_INFOFRAME_FILE(_f) \
683static ssize_t _f##_read_infoframe(struct file *filp, \
684 char __user *ubuf, \
685 size_t count, \
686 loff_t *ppos) \
687{ \
688 struct drm_connector_hdmi_infoframe *infoframe; \
689 struct drm_connector_state *conn_state; \
690 struct drm_connector *connector; \
691 union hdmi_infoframe *frame; \
692 struct drm_device *dev; \
693 u8 buf[HDMI_INFOFRAME_SIZE(MAX)]; \
694 ssize_t len = 0; \
695 \
696 connector = filp->private_data; \
697 dev = connector->dev; \
698 \
699 drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); \
700 \
701 conn_state = connector->state; \
702 infoframe = &conn_state->hdmi.infoframes._f; \
703 if (!infoframe->set) \
704 goto out; \
705 \
706 frame = &infoframe->data; \
707 len = hdmi_infoframe_pack(frame, buf, sizeof(buf)); \
708 if (len < 0) \
709 goto out; \
710 \
711 len = simple_read_from_buffer(ubuf, count, ppos, buf, len); \
712 \
713out: \
714 drm_modeset_unlock(&dev->mode_config.connection_mutex); \
715 return len; \
716} \
717\
718static const struct file_operations _f##_infoframe_fops = { \
719 .owner = THIS_MODULE, \
720 .open = simple_open, \
721 .read = _f##_read_infoframe, \
722}; \
723\
724static int create_hdmi_## _f ## _infoframe_file(struct drm_connector *connector, \
725 struct dentry *parent) \
726{ \
727 struct dentry *file; \
728 \
729 file = debugfs_create_file(#_f, 0400, parent, connector, &_f ## _infoframe_fops); \
730 if (IS_ERR(file)) \
731 return PTR_ERR(file); \
732 \
733 return 0; \
734}
735
736DEFINE_INFOFRAME_FILE(avi);
737DEFINE_INFOFRAME_FILE(hdmi);
738DEFINE_INFOFRAME_FILE(hdr_drm);
739DEFINE_INFOFRAME_FILE(spd);
740
741static int create_hdmi_infoframe_files(struct drm_connector *connector,
742 struct dentry *parent)
743{
744 int ret;
745
746 ret = create_hdmi_audio_infoframe_file(connector, parent);
747 if (ret)
748 return ret;
749
750 ret = create_hdmi_avi_infoframe_file(connector, parent);
751 if (ret)
752 return ret;
753
754 ret = create_hdmi_hdmi_infoframe_file(connector, parent);
755 if (ret)
756 return ret;
757
758 ret = create_hdmi_hdr_drm_infoframe_file(connector, parent);
759 if (ret)
760 return ret;
761
762 ret = create_hdmi_spd_infoframe_file(connector, parent);
763 if (ret)
764 return ret;
765
766 return 0;
767}
768
769static void hdmi_debugfs_add(struct drm_connector *connector)
770{
771 struct dentry *dir;
772
773 if (!(connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
774 connector->connector_type == DRM_MODE_CONNECTOR_HDMIB))
775 return;
776
777 dir = debugfs_create_dir(name: "infoframes", parent: connector->debugfs_entry);
778 if (IS_ERR(ptr: dir))
779 return;
780
781 create_hdmi_infoframe_files(connector, parent: dir);
782}
783
784void drm_debugfs_connector_add(struct drm_connector *connector)
785{
786 struct drm_device *dev = connector->dev;
787 struct dentry *root;
788
789 if (!dev->debugfs_root)
790 return;
791
792 root = debugfs_create_dir(name: connector->name, parent: dev->debugfs_root);
793 connector->debugfs_entry = root;
794
795 /* force */
796 debugfs_create_file("force", 0644, root, connector,
797 &drm_connector_fops);
798
799 /* edid */
800 debugfs_create_file("edid_override", 0644, root, connector,
801 &drm_edid_fops);
802
803 /* vrr range */
804 debugfs_create_file("vrr_range", 0444, root, connector,
805 &vrr_range_fops);
806
807 /* max bpc */
808 debugfs_create_file("output_bpc", 0444, root, connector,
809 &output_bpc_fops);
810
811 hdmi_debugfs_add(connector);
812
813 if (connector->funcs->debugfs_init)
814 connector->funcs->debugfs_init(connector, root);
815}
816
817void drm_debugfs_connector_remove(struct drm_connector *connector)
818{
819 if (!connector->debugfs_entry)
820 return;
821
822 debugfs_remove_recursive(dentry: connector->debugfs_entry);
823
824 connector->debugfs_entry = NULL;
825}
826
827void drm_debugfs_crtc_add(struct drm_crtc *crtc)
828{
829 struct drm_device *dev = crtc->dev;
830 struct dentry *root;
831 char *name;
832
833 name = kasprintf(GFP_KERNEL, fmt: "crtc-%d", crtc->index);
834 if (!name)
835 return;
836
837 root = debugfs_create_dir(name, parent: dev->debugfs_root);
838 kfree(objp: name);
839
840 crtc->debugfs_entry = root;
841
842 drm_debugfs_crtc_crc_add(crtc);
843}
844
845void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
846{
847 debugfs_remove_recursive(dentry: crtc->debugfs_entry);
848 crtc->debugfs_entry = NULL;
849}
850
851void drm_debugfs_encoder_add(struct drm_encoder *encoder)
852{
853 struct drm_minor *minor = encoder->dev->primary;
854 struct dentry *root;
855 char *name;
856
857 name = kasprintf(GFP_KERNEL, fmt: "encoder-%d", encoder->index);
858 if (!name)
859 return;
860
861 root = debugfs_create_dir(name, parent: minor->debugfs_root);
862 kfree(objp: name);
863
864 encoder->debugfs_entry = root;
865
866 drm_bridge_debugfs_encoder_params(root, encoder);
867
868 if (encoder->funcs && encoder->funcs->debugfs_init)
869 encoder->funcs->debugfs_init(encoder, root);
870}
871
872void drm_debugfs_encoder_remove(struct drm_encoder *encoder)
873{
874 debugfs_remove_recursive(dentry: encoder->debugfs_entry);
875 encoder->debugfs_entry = NULL;
876}
877

source code of linux/drivers/gpu/drm/drm_debugfs.c