xref: /openbmc/linux/drivers/gpu/drm/drm_debugfs.c (revision 711aab1d) 
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/seq_file.h>
28 #include <linux/slab.h>
29 #include <linux/export.h>
30 
31 #include <drm/drm_debugfs.h>
32 #include <drm/drm_edid.h>
33 #include <drm/drm_atomic.h>
34 #include <drm/drmP.h>
35 
36 #include "drm_internal.h"
37 #include "drm_crtc_internal.h"
38 
39 #if defined(CONFIG_DEBUG_FS)
40 
41 /***************************************************
42  * Initialization, etc.
43  **************************************************/
44 
45 static const struct drm_info_list drm_debugfs_list[] = {
46 	{"name", drm_name_info, 0},
47 	{"clients", drm_clients_info, 0},
48 	{"gem_names", drm_gem_name_info, DRIVER_GEM},
49 };
50 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
51 
52 
53 static int drm_debugfs_open(struct inode *inode, struct file *file)
54 {
55 	struct drm_info_node *node = inode->i_private;
56 
57 	return single_open(file, node->info_ent->show, node);
58 }
59 
60 
61 static const struct file_operations drm_debugfs_fops = {
62 	.owner = THIS_MODULE,
63 	.open = drm_debugfs_open,
64 	.read = seq_read,
65 	.llseek = seq_lseek,
66 	.release = single_release,
67 };
68 
69 
70 /**
71  * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
72  * 			minor
73  * @files: The array of files to create
74  * @count: The number of files given
75  * @root: DRI debugfs dir entry.
76  * @minor: device minor number
77  *
78  * Create a given set of debugfs files represented by an array of
79  * &struct drm_info_list in the given root directory. These files will be removed
80  * automatically on drm_debugfs_cleanup().
81  */
82 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
83 			     struct dentry *root, struct drm_minor *minor)
84 {
85 	struct drm_device *dev = minor->dev;
86 	struct dentry *ent;
87 	struct drm_info_node *tmp;
88 	int i, ret;
89 
90 	for (i = 0; i < count; i++) {
91 		u32 features = files[i].driver_features;
92 
93 		if (features != 0 &&
94 		    (dev->driver->driver_features & features) != features)
95 			continue;
96 
97 		tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
98 		if (tmp == NULL) {
99 			ret = -1;
100 			goto fail;
101 		}
102 		ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
103 					  root, tmp, &drm_debugfs_fops);
104 		if (!ent) {
105 			DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/%s\n",
106 				  root, files[i].name);
107 			kfree(tmp);
108 			ret = -1;
109 			goto fail;
110 		}
111 
112 		tmp->minor = minor;
113 		tmp->dent = ent;
114 		tmp->info_ent = &files[i];
115 
116 		mutex_lock(&minor->debugfs_lock);
117 		list_add(&tmp->list, &minor->debugfs_list);
118 		mutex_unlock(&minor->debugfs_lock);
119 	}
120 	return 0;
121 
122 fail:
123 	drm_debugfs_remove_files(files, count, minor);
124 	return ret;
125 }
126 EXPORT_SYMBOL(drm_debugfs_create_files);
127 
128 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
129 		     struct dentry *root)
130 {
131 	struct drm_device *dev = minor->dev;
132 	char name[64];
133 	int ret;
134 
135 	INIT_LIST_HEAD(&minor->debugfs_list);
136 	mutex_init(&minor->debugfs_lock);
137 	sprintf(name, "%d", minor_id);
138 	minor->debugfs_root = debugfs_create_dir(name, root);
139 	if (!minor->debugfs_root) {
140 		DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
141 		return -1;
142 	}
143 
144 	ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
145 				       minor->debugfs_root, minor);
146 	if (ret) {
147 		debugfs_remove(minor->debugfs_root);
148 		minor->debugfs_root = NULL;
149 		DRM_ERROR("Failed to create core drm debugfs files\n");
150 		return ret;
151 	}
152 
153 	if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
154 		ret = drm_atomic_debugfs_init(minor);
155 		if (ret) {
156 			DRM_ERROR("Failed to create atomic debugfs files\n");
157 			return ret;
158 		}
159 	}
160 
161 	if (dev->driver->debugfs_init) {
162 		ret = dev->driver->debugfs_init(minor);
163 		if (ret) {
164 			DRM_ERROR("DRM: Driver failed to initialize "
165 				  "/sys/kernel/debug/dri.\n");
166 			return ret;
167 		}
168 	}
169 	return 0;
170 }
171 
172 
173 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
174 			     struct drm_minor *minor)
175 {
176 	struct list_head *pos, *q;
177 	struct drm_info_node *tmp;
178 	int i;
179 
180 	mutex_lock(&minor->debugfs_lock);
181 	for (i = 0; i < count; i++) {
182 		list_for_each_safe(pos, q, &minor->debugfs_list) {
183 			tmp = list_entry(pos, struct drm_info_node, list);
184 			if (tmp->info_ent == &files[i]) {
185 				debugfs_remove(tmp->dent);
186 				list_del(pos);
187 				kfree(tmp);
188 			}
189 		}
190 	}
191 	mutex_unlock(&minor->debugfs_lock);
192 	return 0;
193 }
194 EXPORT_SYMBOL(drm_debugfs_remove_files);
195 
196 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
197 {
198 	struct drm_info_node *node, *tmp;
199 
200 	mutex_lock(&minor->debugfs_lock);
201 	list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
202 		debugfs_remove(node->dent);
203 		list_del(&node->list);
204 		kfree(node);
205 	}
206 	mutex_unlock(&minor->debugfs_lock);
207 }
208 
209 int drm_debugfs_cleanup(struct drm_minor *minor)
210 {
211 	if (!minor->debugfs_root)
212 		return 0;
213 
214 	drm_debugfs_remove_all_files(minor);
215 
216 	debugfs_remove_recursive(minor->debugfs_root);
217 	minor->debugfs_root = NULL;
218 
219 	return 0;
220 }
221 
222 static int connector_show(struct seq_file *m, void *data)
223 {
224 	struct drm_connector *connector = m->private;
225 
226 	seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
227 
228 	return 0;
229 }
230 
231 static int connector_open(struct inode *inode, struct file *file)
232 {
233 	struct drm_connector *dev = inode->i_private;
234 
235 	return single_open(file, connector_show, dev);
236 }
237 
238 static ssize_t connector_write(struct file *file, const char __user *ubuf,
239 			       size_t len, loff_t *offp)
240 {
241 	struct seq_file *m = file->private_data;
242 	struct drm_connector *connector = m->private;
243 	char buf[12];
244 
245 	if (len > sizeof(buf) - 1)
246 		return -EINVAL;
247 
248 	if (copy_from_user(buf, ubuf, len))
249 		return -EFAULT;
250 
251 	buf[len] = '\0';
252 
253 	if (!strcmp(buf, "on"))
254 		connector->force = DRM_FORCE_ON;
255 	else if (!strcmp(buf, "digital"))
256 		connector->force = DRM_FORCE_ON_DIGITAL;
257 	else if (!strcmp(buf, "off"))
258 		connector->force = DRM_FORCE_OFF;
259 	else if (!strcmp(buf, "unspecified"))
260 		connector->force = DRM_FORCE_UNSPECIFIED;
261 	else
262 		return -EINVAL;
263 
264 	return len;
265 }
266 
267 static int edid_show(struct seq_file *m, void *data)
268 {
269 	struct drm_connector *connector = m->private;
270 	struct drm_property_blob *edid = connector->edid_blob_ptr;
271 
272 	if (connector->override_edid && edid)
273 		seq_write(m, edid->data, edid->length);
274 
275 	return 0;
276 }
277 
278 static int edid_open(struct inode *inode, struct file *file)
279 {
280 	struct drm_connector *dev = inode->i_private;
281 
282 	return single_open(file, edid_show, dev);
283 }
284 
285 static ssize_t edid_write(struct file *file, const char __user *ubuf,
286 			  size_t len, loff_t *offp)
287 {
288 	struct seq_file *m = file->private_data;
289 	struct drm_connector *connector = m->private;
290 	char *buf;
291 	struct edid *edid;
292 	int ret;
293 
294 	buf = memdup_user(ubuf, len);
295 	if (IS_ERR(buf))
296 		return PTR_ERR(buf);
297 
298 	edid = (struct edid *) buf;
299 
300 	if (len == 5 && !strncmp(buf, "reset", 5)) {
301 		connector->override_edid = false;
302 		ret = drm_mode_connector_update_edid_property(connector, NULL);
303 	} else if (len < EDID_LENGTH ||
304 		   EDID_LENGTH * (1 + edid->extensions) > len)
305 		ret = -EINVAL;
306 	else {
307 		connector->override_edid = false;
308 		ret = drm_mode_connector_update_edid_property(connector, edid);
309 		if (!ret)
310 			connector->override_edid = true;
311 	}
312 
313 	kfree(buf);
314 
315 	return (ret) ? ret : len;
316 }
317 
318 static const struct file_operations drm_edid_fops = {
319 	.owner = THIS_MODULE,
320 	.open = edid_open,
321 	.read = seq_read,
322 	.llseek = seq_lseek,
323 	.release = single_release,
324 	.write = edid_write
325 };
326 
327 
328 static const struct file_operations drm_connector_fops = {
329 	.owner = THIS_MODULE,
330 	.open = connector_open,
331 	.read = seq_read,
332 	.llseek = seq_lseek,
333 	.release = single_release,
334 	.write = connector_write
335 };
336 
337 int drm_debugfs_connector_add(struct drm_connector *connector)
338 {
339 	struct drm_minor *minor = connector->dev->primary;
340 	struct dentry *root, *ent;
341 
342 	if (!minor->debugfs_root)
343 		return -1;
344 
345 	root = debugfs_create_dir(connector->name, minor->debugfs_root);
346 	if (!root)
347 		return -ENOMEM;
348 
349 	connector->debugfs_entry = root;
350 
351 	/* force */
352 	ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
353 				  &drm_connector_fops);
354 	if (!ent)
355 		goto error;
356 
357 	/* edid */
358 	ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
359 				  connector, &drm_edid_fops);
360 	if (!ent)
361 		goto error;
362 
363 	return 0;
364 
365 error:
366 	debugfs_remove_recursive(connector->debugfs_entry);
367 	connector->debugfs_entry = NULL;
368 	return -ENOMEM;
369 }
370 
371 void drm_debugfs_connector_remove(struct drm_connector *connector)
372 {
373 	if (!connector->debugfs_entry)
374 		return;
375 
376 	debugfs_remove_recursive(connector->debugfs_entry);
377 
378 	connector->debugfs_entry = NULL;
379 }
380 
381 int drm_debugfs_crtc_add(struct drm_crtc *crtc)
382 {
383 	struct drm_minor *minor = crtc->dev->primary;
384 	struct dentry *root;
385 	char *name;
386 
387 	name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
388 	if (!name)
389 		return -ENOMEM;
390 
391 	root = debugfs_create_dir(name, minor->debugfs_root);
392 	kfree(name);
393 	if (!root)
394 		return -ENOMEM;
395 
396 	crtc->debugfs_entry = root;
397 
398 	if (drm_debugfs_crtc_crc_add(crtc))
399 		goto error;
400 
401 	return 0;
402 
403 error:
404 	drm_debugfs_crtc_remove(crtc);
405 	return -ENOMEM;
406 }
407 
408 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
409 {
410 	debugfs_remove_recursive(crtc->debugfs_entry);
411 	crtc->debugfs_entry = NULL;
412 }
413 
414 #endif /* CONFIG_DEBUG_FS */
415