xref: /openbmc/linux/drivers/gpu/drm/drm_debugfs.c (revision 93d90ad7) 
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 	{"vm", drm_vm_info, 0},
50 	{"clients", drm_clients_info, 0},
51 	{"bufs", drm_bufs_info, 0},
52 	{"gem_names", drm_gem_name_info, DRIVER_GEM},
53 	{"vma", drm_vma_info, 0},
54 };
55 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
56 
57 
58 static int drm_debugfs_open(struct inode *inode, struct file *file)
59 {
60 	struct drm_info_node *node = inode->i_private;
61 
62 	return single_open(file, node->info_ent->show, node);
63 }
64 
65 
66 static const struct file_operations drm_debugfs_fops = {
67 	.owner = THIS_MODULE,
68 	.open = drm_debugfs_open,
69 	.read = seq_read,
70 	.llseek = seq_lseek,
71 	.release = single_release,
72 };
73 
74 
75 /**
76  * Initialize a given set of debugfs files for a device
77  *
78  * \param files The array of files to create
79  * \param count The number of files given
80  * \param root DRI debugfs dir entry.
81  * \param minor device minor number
82  * \return Zero on success, non-zero on failure
83  *
84  * Create a given set of debugfs files represented by an array of
85  * gdm_debugfs_lists in the given root directory.
86  */
87 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
88 			     struct dentry *root, struct drm_minor *minor)
89 {
90 	struct drm_device *dev = minor->dev;
91 	struct dentry *ent;
92 	struct drm_info_node *tmp;
93 	int i, ret;
94 
95 	for (i = 0; i < count; i++) {
96 		u32 features = files[i].driver_features;
97 
98 		if (features != 0 &&
99 		    (dev->driver->driver_features & features) != features)
100 			continue;
101 
102 		tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
103 		if (tmp == NULL) {
104 			ret = -1;
105 			goto fail;
106 		}
107 		ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
108 					  root, tmp, &drm_debugfs_fops);
109 		if (!ent) {
110 			DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n",
111 				  root->d_name.name, files[i].name);
112 			kfree(tmp);
113 			ret = -1;
114 			goto fail;
115 		}
116 
117 		tmp->minor = minor;
118 		tmp->dent = ent;
119 		tmp->info_ent = &files[i];
120 
121 		mutex_lock(&minor->debugfs_lock);
122 		list_add(&tmp->list, &minor->debugfs_list);
123 		mutex_unlock(&minor->debugfs_lock);
124 	}
125 	return 0;
126 
127 fail:
128 	drm_debugfs_remove_files(files, count, minor);
129 	return ret;
130 }
131 EXPORT_SYMBOL(drm_debugfs_create_files);
132 
133 /**
134  * Initialize the DRI debugfs filesystem for a device
135  *
136  * \param dev DRM device
137  * \param minor device minor number
138  * \param root DRI debugfs dir entry.
139  *
140  * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry
141  * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as
142  * "/sys/kernel/debug/dri/%minor%/%name%".
143  */
144 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
145 		     struct dentry *root)
146 {
147 	struct drm_device *dev = minor->dev;
148 	char name[64];
149 	int ret;
150 
151 	INIT_LIST_HEAD(&minor->debugfs_list);
152 	mutex_init(&minor->debugfs_lock);
153 	sprintf(name, "%d", minor_id);
154 	minor->debugfs_root = debugfs_create_dir(name, root);
155 	if (!minor->debugfs_root) {
156 		DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
157 		return -1;
158 	}
159 
160 	ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
161 				       minor->debugfs_root, minor);
162 	if (ret) {
163 		debugfs_remove(minor->debugfs_root);
164 		minor->debugfs_root = NULL;
165 		DRM_ERROR("Failed to create core drm debugfs files\n");
166 		return ret;
167 	}
168 
169 	if (dev->driver->debugfs_init) {
170 		ret = dev->driver->debugfs_init(minor);
171 		if (ret) {
172 			DRM_ERROR("DRM: Driver failed to initialize "
173 				  "/sys/kernel/debug/dri.\n");
174 			return ret;
175 		}
176 	}
177 	return 0;
178 }
179 
180 
181 /**
182  * Remove a list of debugfs files
183  *
184  * \param files The list of files
185  * \param count The number of files
186  * \param minor The minor of which we should remove the files
187  * \return always zero.
188  *
189  * Remove all debugfs entries created by debugfs_init().
190  */
191 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
192 			     struct drm_minor *minor)
193 {
194 	struct list_head *pos, *q;
195 	struct drm_info_node *tmp;
196 	int i;
197 
198 	mutex_lock(&minor->debugfs_lock);
199 	for (i = 0; i < count; i++) {
200 		list_for_each_safe(pos, q, &minor->debugfs_list) {
201 			tmp = list_entry(pos, struct drm_info_node, list);
202 			if (tmp->info_ent == &files[i]) {
203 				debugfs_remove(tmp->dent);
204 				list_del(pos);
205 				kfree(tmp);
206 			}
207 		}
208 	}
209 	mutex_unlock(&minor->debugfs_lock);
210 	return 0;
211 }
212 EXPORT_SYMBOL(drm_debugfs_remove_files);
213 
214 /**
215  * Cleanup the debugfs filesystem resources.
216  *
217  * \param minor device minor number.
218  * \return always zero.
219  *
220  * Remove all debugfs entries created by debugfs_init().
221  */
222 int drm_debugfs_cleanup(struct drm_minor *minor)
223 {
224 	struct drm_device *dev = minor->dev;
225 
226 	if (!minor->debugfs_root)
227 		return 0;
228 
229 	if (dev->driver->debugfs_cleanup)
230 		dev->driver->debugfs_cleanup(minor);
231 
232 	drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
233 
234 	debugfs_remove(minor->debugfs_root);
235 	minor->debugfs_root = NULL;
236 
237 	return 0;
238 }
239 
240 static int connector_show(struct seq_file *m, void *data)
241 {
242 	struct drm_connector *connector = m->private;
243 	const char *status;
244 
245 	switch (connector->force) {
246 	case DRM_FORCE_ON:
247 		status = "on\n";
248 		break;
249 
250 	case DRM_FORCE_ON_DIGITAL:
251 		status = "digital\n";
252 		break;
253 
254 	case DRM_FORCE_OFF:
255 		status = "off\n";
256 		break;
257 
258 	case DRM_FORCE_UNSPECIFIED:
259 		status = "unspecified\n";
260 		break;
261 
262 	default:
263 		return 0;
264 	}
265 
266 	seq_puts(m, status);
267 
268 	return 0;
269 }
270 
271 static int connector_open(struct inode *inode, struct file *file)
272 {
273 	struct drm_connector *dev = inode->i_private;
274 
275 	return single_open(file, connector_show, dev);
276 }
277 
278 static ssize_t connector_write(struct file *file, const char __user *ubuf,
279 			       size_t len, loff_t *offp)
280 {
281 	struct seq_file *m = file->private_data;
282 	struct drm_connector *connector = m->private;
283 	char buf[12];
284 
285 	if (len > sizeof(buf) - 1)
286 		return -EINVAL;
287 
288 	if (copy_from_user(buf, ubuf, len))
289 		return -EFAULT;
290 
291 	buf[len] = '\0';
292 
293 	if (!strcmp(buf, "on"))
294 		connector->force = DRM_FORCE_ON;
295 	else if (!strcmp(buf, "digital"))
296 		connector->force = DRM_FORCE_ON_DIGITAL;
297 	else if (!strcmp(buf, "off"))
298 		connector->force = DRM_FORCE_OFF;
299 	else if (!strcmp(buf, "unspecified"))
300 		connector->force = DRM_FORCE_UNSPECIFIED;
301 	else
302 		return -EINVAL;
303 
304 	return len;
305 }
306 
307 static int edid_show(struct seq_file *m, void *data)
308 {
309 	struct drm_connector *connector = m->private;
310 	struct drm_property_blob *edid = connector->edid_blob_ptr;
311 
312 	if (connector->override_edid && edid)
313 		seq_write(m, edid->data, edid->length);
314 
315 	return 0;
316 }
317 
318 static int edid_open(struct inode *inode, struct file *file)
319 {
320 	struct drm_connector *dev = inode->i_private;
321 
322 	return single_open(file, edid_show, dev);
323 }
324 
325 static ssize_t edid_write(struct file *file, const char __user *ubuf,
326 			  size_t len, loff_t *offp)
327 {
328 	struct seq_file *m = file->private_data;
329 	struct drm_connector *connector = m->private;
330 	char *buf;
331 	struct edid *edid;
332 	int ret;
333 
334 	buf = memdup_user(ubuf, len);
335 	if (IS_ERR(buf))
336 		return PTR_ERR(buf);
337 
338 	edid = (struct edid *) buf;
339 
340 	if (len == 5 && !strncmp(buf, "reset", 5)) {
341 		connector->override_edid = false;
342 		ret = drm_mode_connector_update_edid_property(connector, NULL);
343 	} else if (len < EDID_LENGTH ||
344 		   EDID_LENGTH * (1 + edid->extensions) > len)
345 		ret = -EINVAL;
346 	else {
347 		connector->override_edid = false;
348 		ret = drm_mode_connector_update_edid_property(connector, edid);
349 		if (!ret)
350 			connector->override_edid = true;
351 	}
352 
353 	kfree(buf);
354 
355 	return (ret) ? ret : len;
356 }
357 
358 static const struct file_operations drm_edid_fops = {
359 	.owner = THIS_MODULE,
360 	.open = edid_open,
361 	.read = seq_read,
362 	.llseek = seq_lseek,
363 	.release = single_release,
364 	.write = edid_write
365 };
366 
367 
368 static const struct file_operations drm_connector_fops = {
369 	.owner = THIS_MODULE,
370 	.open = connector_open,
371 	.read = seq_read,
372 	.llseek = seq_lseek,
373 	.release = single_release,
374 	.write = connector_write
375 };
376 
377 int drm_debugfs_connector_add(struct drm_connector *connector)
378 {
379 	struct drm_minor *minor = connector->dev->primary;
380 	struct dentry *root, *ent;
381 
382 	if (!minor->debugfs_root)
383 		return -1;
384 
385 	root = debugfs_create_dir(connector->name, minor->debugfs_root);
386 	if (!root)
387 		return -ENOMEM;
388 
389 	connector->debugfs_entry = root;
390 
391 	/* force */
392 	ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
393 				  &drm_connector_fops);
394 	if (!ent)
395 		goto error;
396 
397 	/* edid */
398 	ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
399 				  connector, &drm_edid_fops);
400 	if (!ent)
401 		goto error;
402 
403 	return 0;
404 
405 error:
406 	debugfs_remove_recursive(connector->debugfs_entry);
407 	connector->debugfs_entry = NULL;
408 	return -ENOMEM;
409 }
410 
411 void drm_debugfs_connector_remove(struct drm_connector *connector)
412 {
413 	if (!connector->debugfs_entry)
414 		return;
415 
416 	debugfs_remove_recursive(connector->debugfs_entry);
417 
418 	connector->debugfs_entry = NULL;
419 }
420 
421 #endif /* CONFIG_DEBUG_FS */
422 
423