xref: /openbmc/linux/drivers/gpu/drm/drm_debugfs.c (revision 72d25643) 
1 /**
2  * \file drm_debugfs.c
3  * debugfs support for DRM
4  *
5  * \author Ben Gamari <bgamari@gmail.com>
6  */
7 
8 /*
9  * Created: Sun Dec 21 13:08:50 2008 by bgamari@gmail.com
10  *
11  * Copyright 2008 Ben Gamari <bgamari@gmail.com>
12  *
13  * Permission is hereby granted, free of charge, to any person obtaining a
14  * copy of this software and associated documentation files (the "Software"),
15  * to deal in the Software without restriction, including without limitation
16  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
17  * and/or sell copies of the Software, and to permit persons to whom the
18  * Software is furnished to do so, subject to the following conditions:
19  *
20  * The above copyright notice and this permission notice (including the next
21  * paragraph) shall be included in all copies or substantial portions of the
22  * Software.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
27  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
28  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
29  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
30  * OTHER DEALINGS IN THE SOFTWARE.
31  */
32 
33 #include <linux/debugfs.h>
34 #include <linux/seq_file.h>
35 #include <linux/slab.h>
36 #include <linux/export.h>
37 #include <drm/drmP.h>
38 #include <drm/drm_edid.h>
39 #include "drm_internal.h"
40 
41 #if defined(CONFIG_DEBUG_FS)
42 
43 /***************************************************
44  * Initialization, etc.
45  **************************************************/
46 
47 static const struct drm_info_list drm_debugfs_list[] = {
48 	{"name", drm_name_info, 0},
49 	{"clients", drm_clients_info, 0},
50 	{"gem_names", drm_gem_name_info, DRIVER_GEM},
51 };
52 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
53 
54 
55 static int drm_debugfs_open(struct inode *inode, struct file *file)
56 {
57 	struct drm_info_node *node = inode->i_private;
58 
59 	return single_open(file, node->info_ent->show, node);
60 }
61 
62 
63 static const struct file_operations drm_debugfs_fops = {
64 	.owner = THIS_MODULE,
65 	.open = drm_debugfs_open,
66 	.read = seq_read,
67 	.llseek = seq_lseek,
68 	.release = single_release,
69 };
70 
71 
72 /**
73  * Initialize a given set of debugfs files for a device
74  *
75  * \param files The array of files to create
76  * \param count The number of files given
77  * \param root DRI debugfs dir entry.
78  * \param minor device minor number
79  * \return Zero on success, non-zero on failure
80  *
81  * Create a given set of debugfs files represented by an array of
82  * gdm_debugfs_lists in the given root directory.
83  */
84 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
85 			     struct dentry *root, struct drm_minor *minor)
86 {
87 	struct drm_device *dev = minor->dev;
88 	struct dentry *ent;
89 	struct drm_info_node *tmp;
90 	int i, ret;
91 
92 	for (i = 0; i < count; i++) {
93 		u32 features = files[i].driver_features;
94 
95 		if (features != 0 &&
96 		    (dev->driver->driver_features & features) != features)
97 			continue;
98 
99 		tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
100 		if (tmp == NULL) {
101 			ret = -1;
102 			goto fail;
103 		}
104 		ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
105 					  root, tmp, &drm_debugfs_fops);
106 		if (!ent) {
107 			DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n",
108 				  root->d_name.name, files[i].name);
109 			kfree(tmp);
110 			ret = -1;
111 			goto fail;
112 		}
113 
114 		tmp->minor = minor;
115 		tmp->dent = ent;
116 		tmp->info_ent = &files[i];
117 
118 		mutex_lock(&minor->debugfs_lock);
119 		list_add(&tmp->list, &minor->debugfs_list);
120 		mutex_unlock(&minor->debugfs_lock);
121 	}
122 	return 0;
123 
124 fail:
125 	drm_debugfs_remove_files(files, count, minor);
126 	return ret;
127 }
128 EXPORT_SYMBOL(drm_debugfs_create_files);
129 
130 /**
131  * Initialize the DRI debugfs filesystem for a device
132  *
133  * \param dev DRM device
134  * \param minor device minor number
135  * \param root DRI debugfs dir entry.
136  *
137  * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry
138  * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as
139  * "/sys/kernel/debug/dri/%minor%/%name%".
140  */
141 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
142 		     struct dentry *root)
143 {
144 	struct drm_device *dev = minor->dev;
145 	char name[64];
146 	int ret;
147 
148 	INIT_LIST_HEAD(&minor->debugfs_list);
149 	mutex_init(&minor->debugfs_lock);
150 	sprintf(name, "%d", minor_id);
151 	minor->debugfs_root = debugfs_create_dir(name, root);
152 	if (!minor->debugfs_root) {
153 		DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
154 		return -1;
155 	}
156 
157 	ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
158 				       minor->debugfs_root, minor);
159 	if (ret) {
160 		debugfs_remove(minor->debugfs_root);
161 		minor->debugfs_root = NULL;
162 		DRM_ERROR("Failed to create core drm debugfs files\n");
163 		return ret;
164 	}
165 
166 	if (dev->driver->debugfs_init) {
167 		ret = dev->driver->debugfs_init(minor);
168 		if (ret) {
169 			DRM_ERROR("DRM: Driver failed to initialize "
170 				  "/sys/kernel/debug/dri.\n");
171 			return ret;
172 		}
173 	}
174 	return 0;
175 }
176 
177 
178 /**
179  * Remove a list of debugfs files
180  *
181  * \param files The list of files
182  * \param count The number of files
183  * \param minor The minor of which we should remove the files
184  * \return always zero.
185  *
186  * Remove all debugfs entries created by debugfs_init().
187  */
188 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
189 			     struct drm_minor *minor)
190 {
191 	struct list_head *pos, *q;
192 	struct drm_info_node *tmp;
193 	int i;
194 
195 	mutex_lock(&minor->debugfs_lock);
196 	for (i = 0; i < count; i++) {
197 		list_for_each_safe(pos, q, &minor->debugfs_list) {
198 			tmp = list_entry(pos, struct drm_info_node, list);
199 			if (tmp->info_ent == &files[i]) {
200 				debugfs_remove(tmp->dent);
201 				list_del(pos);
202 				kfree(tmp);
203 			}
204 		}
205 	}
206 	mutex_unlock(&minor->debugfs_lock);
207 	return 0;
208 }
209 EXPORT_SYMBOL(drm_debugfs_remove_files);
210 
211 /**
212  * Cleanup the debugfs filesystem resources.
213  *
214  * \param minor device minor number.
215  * \return always zero.
216  *
217  * Remove all debugfs entries created by debugfs_init().
218  */
219 int drm_debugfs_cleanup(struct drm_minor *minor)
220 {
221 	struct drm_device *dev = minor->dev;
222 
223 	if (!minor->debugfs_root)
224 		return 0;
225 
226 	if (dev->driver->debugfs_cleanup)
227 		dev->driver->debugfs_cleanup(minor);
228 
229 	drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
230 
231 	debugfs_remove(minor->debugfs_root);
232 	minor->debugfs_root = NULL;
233 
234 	return 0;
235 }
236 
237 static int connector_show(struct seq_file *m, void *data)
238 {
239 	struct drm_connector *connector = m->private;
240 	const char *status;
241 
242 	switch (connector->force) {
243 	case DRM_FORCE_ON:
244 		status = "on\n";
245 		break;
246 
247 	case DRM_FORCE_ON_DIGITAL:
248 		status = "digital\n";
249 		break;
250 
251 	case DRM_FORCE_OFF:
252 		status = "off\n";
253 		break;
254 
255 	case DRM_FORCE_UNSPECIFIED:
256 		status = "unspecified\n";
257 		break;
258 
259 	default:
260 		return 0;
261 	}
262 
263 	seq_puts(m, status);
264 
265 	return 0;
266 }
267 
268 static int connector_open(struct inode *inode, struct file *file)
269 {
270 	struct drm_connector *dev = inode->i_private;
271 
272 	return single_open(file, connector_show, dev);
273 }
274 
275 static ssize_t connector_write(struct file *file, const char __user *ubuf,
276 			       size_t len, loff_t *offp)
277 {
278 	struct seq_file *m = file->private_data;
279 	struct drm_connector *connector = m->private;
280 	char buf[12];
281 
282 	if (len > sizeof(buf) - 1)
283 		return -EINVAL;
284 
285 	if (copy_from_user(buf, ubuf, len))
286 		return -EFAULT;
287 
288 	buf[len] = '\0';
289 
290 	if (!strcmp(buf, "on"))
291 		connector->force = DRM_FORCE_ON;
292 	else if (!strcmp(buf, "digital"))
293 		connector->force = DRM_FORCE_ON_DIGITAL;
294 	else if (!strcmp(buf, "off"))
295 		connector->force = DRM_FORCE_OFF;
296 	else if (!strcmp(buf, "unspecified"))
297 		connector->force = DRM_FORCE_UNSPECIFIED;
298 	else
299 		return -EINVAL;
300 
301 	return len;
302 }
303 
304 static int edid_show(struct seq_file *m, void *data)
305 {
306 	struct drm_connector *connector = m->private;
307 	struct drm_property_blob *edid = connector->edid_blob_ptr;
308 
309 	if (connector->override_edid && edid)
310 		seq_write(m, edid->data, edid->length);
311 
312 	return 0;
313 }
314 
315 static int edid_open(struct inode *inode, struct file *file)
316 {
317 	struct drm_connector *dev = inode->i_private;
318 
319 	return single_open(file, edid_show, dev);
320 }
321 
322 static ssize_t edid_write(struct file *file, const char __user *ubuf,
323 			  size_t len, loff_t *offp)
324 {
325 	struct seq_file *m = file->private_data;
326 	struct drm_connector *connector = m->private;
327 	char *buf;
328 	struct edid *edid;
329 	int ret;
330 
331 	buf = memdup_user(ubuf, len);
332 	if (IS_ERR(buf))
333 		return PTR_ERR(buf);
334 
335 	edid = (struct edid *) buf;
336 
337 	if (len == 5 && !strncmp(buf, "reset", 5)) {
338 		connector->override_edid = false;
339 		ret = drm_mode_connector_update_edid_property(connector, NULL);
340 	} else if (len < EDID_LENGTH ||
341 		   EDID_LENGTH * (1 + edid->extensions) > len)
342 		ret = -EINVAL;
343 	else {
344 		connector->override_edid = false;
345 		ret = drm_mode_connector_update_edid_property(connector, edid);
346 		if (!ret)
347 			connector->override_edid = true;
348 	}
349 
350 	kfree(buf);
351 
352 	return (ret) ? ret : len;
353 }
354 
355 static const struct file_operations drm_edid_fops = {
356 	.owner = THIS_MODULE,
357 	.open = edid_open,
358 	.read = seq_read,
359 	.llseek = seq_lseek,
360 	.release = single_release,
361 	.write = edid_write
362 };
363 
364 
365 static const struct file_operations drm_connector_fops = {
366 	.owner = THIS_MODULE,
367 	.open = connector_open,
368 	.read = seq_read,
369 	.llseek = seq_lseek,
370 	.release = single_release,
371 	.write = connector_write
372 };
373 
374 int drm_debugfs_connector_add(struct drm_connector *connector)
375 {
376 	struct drm_minor *minor = connector->dev->primary;
377 	struct dentry *root, *ent;
378 
379 	if (!minor->debugfs_root)
380 		return -1;
381 
382 	root = debugfs_create_dir(connector->name, minor->debugfs_root);
383 	if (!root)
384 		return -ENOMEM;
385 
386 	connector->debugfs_entry = root;
387 
388 	/* force */
389 	ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
390 				  &drm_connector_fops);
391 	if (!ent)
392 		goto error;
393 
394 	/* edid */
395 	ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
396 				  connector, &drm_edid_fops);
397 	if (!ent)
398 		goto error;
399 
400 	return 0;
401 
402 error:
403 	debugfs_remove_recursive(connector->debugfs_entry);
404 	connector->debugfs_entry = NULL;
405 	return -ENOMEM;
406 }
407 
408 void drm_debugfs_connector_remove(struct drm_connector *connector)
409 {
410 	if (!connector->debugfs_entry)
411 		return;
412 
413 	debugfs_remove_recursive(connector->debugfs_entry);
414 
415 	connector->debugfs_entry = NULL;
416 }
417 
418 #endif /* CONFIG_DEBUG_FS */
419 
420