xref: /linux/drivers/gpu/drm/drm_debugfs.c (revision 6c8c1406) 
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_client.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 
42 #include "drm_crtc_internal.h"
43 #include "drm_internal.h"
44 
45 #if defined(CONFIG_DEBUG_FS)
46 
47 /***************************************************
48  * Initialization, etc.
49  **************************************************/
50 
51 static int drm_name_info(struct seq_file *m, void *data)
52 {
53 	struct drm_info_node *node = (struct drm_info_node *) m->private;
54 	struct drm_minor *minor = node->minor;
55 	struct drm_device *dev = minor->dev;
56 	struct drm_master *master;
57 
58 	mutex_lock(&dev->master_mutex);
59 	master = dev->master;
60 	seq_printf(m, "%s", dev->driver->name);
61 	if (dev->dev)
62 		seq_printf(m, " dev=%s", dev_name(dev->dev));
63 	if (master && master->unique)
64 		seq_printf(m, " master=%s", master->unique);
65 	if (dev->unique)
66 		seq_printf(m, " unique=%s", dev->unique);
67 	seq_printf(m, "\n");
68 	mutex_unlock(&dev->master_mutex);
69 
70 	return 0;
71 }
72 
73 static int drm_clients_info(struct seq_file *m, void *data)
74 {
75 	struct drm_info_node *node = (struct drm_info_node *) m->private;
76 	struct drm_device *dev = node->minor->dev;
77 	struct drm_file *priv;
78 	kuid_t uid;
79 
80 	seq_printf(m,
81 		   "%20s %5s %3s master a %5s %10s\n",
82 		   "command",
83 		   "pid",
84 		   "dev",
85 		   "uid",
86 		   "magic");
87 
88 	/* dev->filelist is sorted youngest first, but we want to present
89 	 * oldest first (i.e. kernel, servers, clients), so walk backwardss.
90 	 */
91 	mutex_lock(&dev->filelist_mutex);
92 	list_for_each_entry_reverse(priv, &dev->filelist, lhead) {
93 		struct task_struct *task;
94 		bool is_current_master = drm_is_current_master(priv);
95 
96 		rcu_read_lock(); /* locks pid_task()->comm */
97 		task = pid_task(priv->pid, PIDTYPE_PID);
98 		uid = task ? __task_cred(task)->euid : GLOBAL_ROOT_UID;
99 		seq_printf(m, "%20s %5d %3d   %c    %c %5d %10u\n",
100 			   task ? task->comm : "<unknown>",
101 			   pid_vnr(priv->pid),
102 			   priv->minor->index,
103 			   is_current_master ? 'y' : 'n',
104 			   priv->authenticated ? 'y' : 'n',
105 			   from_kuid_munged(seq_user_ns(m), uid),
106 			   priv->magic);
107 		rcu_read_unlock();
108 	}
109 	mutex_unlock(&dev->filelist_mutex);
110 	return 0;
111 }
112 
113 static int drm_gem_one_name_info(int id, void *ptr, void *data)
114 {
115 	struct drm_gem_object *obj = ptr;
116 	struct seq_file *m = data;
117 
118 	seq_printf(m, "%6d %8zd %7d %8d\n",
119 		   obj->name, obj->size,
120 		   obj->handle_count,
121 		   kref_read(&obj->refcount));
122 	return 0;
123 }
124 
125 static int drm_gem_name_info(struct seq_file *m, void *data)
126 {
127 	struct drm_info_node *node = (struct drm_info_node *) m->private;
128 	struct drm_device *dev = node->minor->dev;
129 
130 	seq_printf(m, "  name     size handles refcount\n");
131 
132 	mutex_lock(&dev->object_name_lock);
133 	idr_for_each(&dev->object_name_idr, drm_gem_one_name_info, m);
134 	mutex_unlock(&dev->object_name_lock);
135 
136 	return 0;
137 }
138 
139 static const struct drm_info_list drm_debugfs_list[] = {
140 	{"name", drm_name_info, 0},
141 	{"clients", drm_clients_info, 0},
142 	{"gem_names", drm_gem_name_info, DRIVER_GEM},
143 };
144 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
145 
146 
147 static int drm_debugfs_open(struct inode *inode, struct file *file)
148 {
149 	struct drm_info_node *node = inode->i_private;
150 
151 	return single_open(file, node->info_ent->show, node);
152 }
153 
154 
155 static const struct file_operations drm_debugfs_fops = {
156 	.owner = THIS_MODULE,
157 	.open = drm_debugfs_open,
158 	.read = seq_read,
159 	.llseek = seq_lseek,
160 	.release = single_release,
161 };
162 
163 
164 /**
165  * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
166  * 			minor
167  * @files: The array of files to create
168  * @count: The number of files given
169  * @root: DRI debugfs dir entry.
170  * @minor: device minor number
171  *
172  * Create a given set of debugfs files represented by an array of
173  * &struct drm_info_list in the given root directory. These files will be removed
174  * automatically on drm_debugfs_cleanup().
175  */
176 void drm_debugfs_create_files(const struct drm_info_list *files, int count,
177 			      struct dentry *root, struct drm_minor *minor)
178 {
179 	struct drm_device *dev = minor->dev;
180 	struct drm_info_node *tmp;
181 	int i;
182 
183 	for (i = 0; i < count; i++) {
184 		u32 features = files[i].driver_features;
185 
186 		if (features && !drm_core_check_all_features(dev, features))
187 			continue;
188 
189 		tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
190 		if (tmp == NULL)
191 			continue;
192 
193 		tmp->minor = minor;
194 		tmp->dent = debugfs_create_file(files[i].name,
195 						S_IFREG | S_IRUGO, root, tmp,
196 						&drm_debugfs_fops);
197 		tmp->info_ent = &files[i];
198 
199 		mutex_lock(&minor->debugfs_lock);
200 		list_add(&tmp->list, &minor->debugfs_list);
201 		mutex_unlock(&minor->debugfs_lock);
202 	}
203 }
204 EXPORT_SYMBOL(drm_debugfs_create_files);
205 
206 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
207 		     struct dentry *root)
208 {
209 	struct drm_device *dev = minor->dev;
210 	char name[64];
211 
212 	INIT_LIST_HEAD(&minor->debugfs_list);
213 	mutex_init(&minor->debugfs_lock);
214 	sprintf(name, "%d", minor_id);
215 	minor->debugfs_root = debugfs_create_dir(name, root);
216 
217 	drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
218 				 minor->debugfs_root, minor);
219 
220 	if (drm_drv_uses_atomic_modeset(dev)) {
221 		drm_atomic_debugfs_init(minor);
222 	}
223 
224 	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
225 		drm_framebuffer_debugfs_init(minor);
226 
227 		drm_client_debugfs_init(minor);
228 	}
229 
230 	if (dev->driver->debugfs_init)
231 		dev->driver->debugfs_init(minor);
232 
233 	return 0;
234 }
235 
236 
237 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
238 			     struct drm_minor *minor)
239 {
240 	struct list_head *pos, *q;
241 	struct drm_info_node *tmp;
242 	int i;
243 
244 	mutex_lock(&minor->debugfs_lock);
245 	for (i = 0; i < count; i++) {
246 		list_for_each_safe(pos, q, &minor->debugfs_list) {
247 			tmp = list_entry(pos, struct drm_info_node, list);
248 			if (tmp->info_ent == &files[i]) {
249 				debugfs_remove(tmp->dent);
250 				list_del(pos);
251 				kfree(tmp);
252 			}
253 		}
254 	}
255 	mutex_unlock(&minor->debugfs_lock);
256 	return 0;
257 }
258 EXPORT_SYMBOL(drm_debugfs_remove_files);
259 
260 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
261 {
262 	struct drm_info_node *node, *tmp;
263 
264 	mutex_lock(&minor->debugfs_lock);
265 	list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
266 		debugfs_remove(node->dent);
267 		list_del(&node->list);
268 		kfree(node);
269 	}
270 	mutex_unlock(&minor->debugfs_lock);
271 }
272 
273 void drm_debugfs_cleanup(struct drm_minor *minor)
274 {
275 	if (!minor->debugfs_root)
276 		return;
277 
278 	drm_debugfs_remove_all_files(minor);
279 
280 	debugfs_remove_recursive(minor->debugfs_root);
281 	minor->debugfs_root = NULL;
282 }
283 
284 static int connector_show(struct seq_file *m, void *data)
285 {
286 	struct drm_connector *connector = m->private;
287 
288 	seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
289 
290 	return 0;
291 }
292 
293 static int connector_open(struct inode *inode, struct file *file)
294 {
295 	struct drm_connector *dev = inode->i_private;
296 
297 	return single_open(file, connector_show, dev);
298 }
299 
300 static ssize_t connector_write(struct file *file, const char __user *ubuf,
301 			       size_t len, loff_t *offp)
302 {
303 	struct seq_file *m = file->private_data;
304 	struct drm_connector *connector = m->private;
305 	char buf[12];
306 
307 	if (len > sizeof(buf) - 1)
308 		return -EINVAL;
309 
310 	if (copy_from_user(buf, ubuf, len))
311 		return -EFAULT;
312 
313 	buf[len] = '\0';
314 
315 	if (sysfs_streq(buf, "on"))
316 		connector->force = DRM_FORCE_ON;
317 	else if (sysfs_streq(buf, "digital"))
318 		connector->force = DRM_FORCE_ON_DIGITAL;
319 	else if (sysfs_streq(buf, "off"))
320 		connector->force = DRM_FORCE_OFF;
321 	else if (sysfs_streq(buf, "unspecified"))
322 		connector->force = DRM_FORCE_UNSPECIFIED;
323 	else
324 		return -EINVAL;
325 
326 	return len;
327 }
328 
329 static int edid_show(struct seq_file *m, void *data)
330 {
331 	struct drm_connector *connector = m->private;
332 	struct drm_property_blob *edid = connector->edid_blob_ptr;
333 
334 	if (connector->override_edid && edid)
335 		seq_write(m, edid->data, edid->length);
336 
337 	return 0;
338 }
339 
340 static int edid_open(struct inode *inode, struct file *file)
341 {
342 	struct drm_connector *dev = inode->i_private;
343 
344 	return single_open(file, edid_show, dev);
345 }
346 
347 static ssize_t edid_write(struct file *file, const char __user *ubuf,
348 			  size_t len, loff_t *offp)
349 {
350 	struct seq_file *m = file->private_data;
351 	struct drm_connector *connector = m->private;
352 	char *buf;
353 	int ret;
354 
355 	buf = memdup_user(ubuf, len);
356 	if (IS_ERR(buf))
357 		return PTR_ERR(buf);
358 
359 	if (len == 5 && !strncmp(buf, "reset", 5))
360 		ret = drm_edid_override_reset(connector);
361 	else
362 		ret = drm_edid_override_set(connector, buf, len);
363 
364 	kfree(buf);
365 
366 	return ret ? ret : len;
367 }
368 
369 /*
370  * Returns the min and max vrr vfreq through the connector's debugfs file.
371  * Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range
372  */
373 static int vrr_range_show(struct seq_file *m, void *data)
374 {
375 	struct drm_connector *connector = m->private;
376 
377 	if (connector->status != connector_status_connected)
378 		return -ENODEV;
379 
380 	seq_printf(m, "Min: %u\n", connector->display_info.monitor_range.min_vfreq);
381 	seq_printf(m, "Max: %u\n", connector->display_info.monitor_range.max_vfreq);
382 
383 	return 0;
384 }
385 DEFINE_SHOW_ATTRIBUTE(vrr_range);
386 
387 /*
388  * Returns Connector's max supported bpc through debugfs file.
389  * Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
390  */
391 static int output_bpc_show(struct seq_file *m, void *data)
392 {
393 	struct drm_connector *connector = m->private;
394 
395 	if (connector->status != connector_status_connected)
396 		return -ENODEV;
397 
398 	seq_printf(m, "Maximum: %u\n", connector->display_info.bpc);
399 
400 	return 0;
401 }
402 DEFINE_SHOW_ATTRIBUTE(output_bpc);
403 
404 static const struct file_operations drm_edid_fops = {
405 	.owner = THIS_MODULE,
406 	.open = edid_open,
407 	.read = seq_read,
408 	.llseek = seq_lseek,
409 	.release = single_release,
410 	.write = edid_write
411 };
412 
413 
414 static const struct file_operations drm_connector_fops = {
415 	.owner = THIS_MODULE,
416 	.open = connector_open,
417 	.read = seq_read,
418 	.llseek = seq_lseek,
419 	.release = single_release,
420 	.write = connector_write
421 };
422 
423 void drm_debugfs_connector_add(struct drm_connector *connector)
424 {
425 	struct drm_minor *minor = connector->dev->primary;
426 	struct dentry *root;
427 
428 	if (!minor->debugfs_root)
429 		return;
430 
431 	root = debugfs_create_dir(connector->name, minor->debugfs_root);
432 	connector->debugfs_entry = root;
433 
434 	/* force */
435 	debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
436 			    &drm_connector_fops);
437 
438 	/* edid */
439 	debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root, connector,
440 			    &drm_edid_fops);
441 
442 	/* vrr range */
443 	debugfs_create_file("vrr_range", S_IRUGO, root, connector,
444 			    &vrr_range_fops);
445 
446 	/* max bpc */
447 	debugfs_create_file("output_bpc", 0444, root, connector,
448 			    &output_bpc_fops);
449 
450 	if (connector->funcs->debugfs_init)
451 		connector->funcs->debugfs_init(connector, root);
452 }
453 
454 void drm_debugfs_connector_remove(struct drm_connector *connector)
455 {
456 	if (!connector->debugfs_entry)
457 		return;
458 
459 	debugfs_remove_recursive(connector->debugfs_entry);
460 
461 	connector->debugfs_entry = NULL;
462 }
463 
464 void drm_debugfs_crtc_add(struct drm_crtc *crtc)
465 {
466 	struct drm_minor *minor = crtc->dev->primary;
467 	struct dentry *root;
468 	char *name;
469 
470 	name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
471 	if (!name)
472 		return;
473 
474 	root = debugfs_create_dir(name, minor->debugfs_root);
475 	kfree(name);
476 
477 	crtc->debugfs_entry = root;
478 
479 	drm_debugfs_crtc_crc_add(crtc);
480 }
481 
482 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
483 {
484 	debugfs_remove_recursive(crtc->debugfs_entry);
485 	crtc->debugfs_entry = NULL;
486 }
487 
488 #endif /* CONFIG_DEBUG_FS */
489