3 * debugfs support for DRM
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33 #include <linux/debugfs.h>
34 #include <linux/seq_file.h>
35 #include <linux/slab.h>
36 #include <linux/export.h>
38 #include <drm/drm_edid.h>
39 #include <drm/drm_atomic.h>
40 #include "drm_internal.h"
41 #include "drm_crtc_internal.h"
43 #if defined(CONFIG_DEBUG_FS)
45 /***************************************************
46 * Initialization, etc.
47 **************************************************/
49 static const struct drm_info_list drm_debugfs_list[] = {
50 {"name", drm_name_info, 0},
51 {"clients", drm_clients_info, 0},
52 {"gem_names", drm_gem_name_info, DRIVER_GEM},
54 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
57 static int drm_debugfs_open(struct inode *inode, struct file *file)
59 struct drm_info_node *node = inode->i_private;
61 return single_open(file, node->info_ent->show, node);
65 static const struct file_operations drm_debugfs_fops = {
67 .open = drm_debugfs_open,
70 .release = single_release,
75 * Initialize a given set of debugfs files for a device
77 * \param files The array of files to create
78 * \param count The number of files given
79 * \param root DRI debugfs dir entry.
80 * \param minor device minor number
81 * \return Zero on success, non-zero on failure
83 * Create a given set of debugfs files represented by an array of
84 * &drm_info_list in the given root directory. These files will be removed
85 * automatically on drm_debugfs_cleanup().
87 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
88 struct dentry *root, struct drm_minor *minor)
90 struct drm_device *dev = minor->dev;
92 struct drm_info_node *tmp;
95 for (i = 0; i < count; i++) {
96 u32 features = files[i].driver_features;
99 (dev->driver->driver_features & features) != features)
102 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
107 ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
108 root, tmp, &drm_debugfs_fops);
110 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/%s\n",
111 root, files[i].name);
119 tmp->info_ent = &files[i];
121 mutex_lock(&minor->debugfs_lock);
122 list_add(&tmp->list, &minor->debugfs_list);
123 mutex_unlock(&minor->debugfs_lock);
128 drm_debugfs_remove_files(files, count, minor);
131 EXPORT_SYMBOL(drm_debugfs_create_files);
134 * Initialize the DRI debugfs filesystem for a device
136 * \param dev DRM device
137 * \param minor device minor number
138 * \param root DRI debugfs dir entry.
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%".
144 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
147 struct drm_device *dev = minor->dev;
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);
160 ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
161 minor->debugfs_root, minor);
163 debugfs_remove(minor->debugfs_root);
164 minor->debugfs_root = NULL;
165 DRM_ERROR("Failed to create core drm debugfs files\n");
169 if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
170 ret = drm_atomic_debugfs_init(minor);
172 DRM_ERROR("Failed to create atomic debugfs files\n");
177 if (dev->driver->debugfs_init) {
178 ret = dev->driver->debugfs_init(minor);
180 DRM_ERROR("DRM: Driver failed to initialize "
181 "/sys/kernel/debug/dri.\n");
190 * Remove a list of debugfs files
192 * \param files The list of files
193 * \param count The number of files
194 * \param minor The minor of which we should remove the files
195 * \return always zero.
197 * Remove all debugfs entries created by debugfs_init().
199 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
200 struct drm_minor *minor)
202 struct list_head *pos, *q;
203 struct drm_info_node *tmp;
206 mutex_lock(&minor->debugfs_lock);
207 for (i = 0; i < count; i++) {
208 list_for_each_safe(pos, q, &minor->debugfs_list) {
209 tmp = list_entry(pos, struct drm_info_node, list);
210 if (tmp->info_ent == &files[i]) {
211 debugfs_remove(tmp->dent);
217 mutex_unlock(&minor->debugfs_lock);
220 EXPORT_SYMBOL(drm_debugfs_remove_files);
222 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
224 struct drm_info_node *node, *tmp;
226 mutex_lock(&minor->debugfs_lock);
227 list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
228 debugfs_remove(node->dent);
229 list_del(&node->list);
232 mutex_unlock(&minor->debugfs_lock);
236 * Cleanup the debugfs filesystem resources.
238 * \param minor device minor number.
239 * \return always zero.
241 * Remove all debugfs entries created by debugfs_init().
243 int drm_debugfs_cleanup(struct drm_minor *minor)
245 struct drm_device *dev = minor->dev;
247 if (!minor->debugfs_root)
250 if (dev->driver->debugfs_cleanup)
251 dev->driver->debugfs_cleanup(minor);
253 drm_debugfs_remove_all_files(minor);
255 debugfs_remove_recursive(minor->debugfs_root);
256 minor->debugfs_root = NULL;
261 static int connector_show(struct seq_file *m, void *data)
263 struct drm_connector *connector = m->private;
266 switch (connector->force) {
271 case DRM_FORCE_ON_DIGITAL:
272 status = "digital\n";
279 case DRM_FORCE_UNSPECIFIED:
280 status = "unspecified\n";
292 static int connector_open(struct inode *inode, struct file *file)
294 struct drm_connector *dev = inode->i_private;
296 return single_open(file, connector_show, dev);
299 static ssize_t connector_write(struct file *file, const char __user *ubuf,
300 size_t len, loff_t *offp)
302 struct seq_file *m = file->private_data;
303 struct drm_connector *connector = m->private;
306 if (len > sizeof(buf) - 1)
309 if (copy_from_user(buf, ubuf, len))
314 if (!strcmp(buf, "on"))
315 connector->force = DRM_FORCE_ON;
316 else if (!strcmp(buf, "digital"))
317 connector->force = DRM_FORCE_ON_DIGITAL;
318 else if (!strcmp(buf, "off"))
319 connector->force = DRM_FORCE_OFF;
320 else if (!strcmp(buf, "unspecified"))
321 connector->force = DRM_FORCE_UNSPECIFIED;
328 static int edid_show(struct seq_file *m, void *data)
330 struct drm_connector *connector = m->private;
331 struct drm_property_blob *edid = connector->edid_blob_ptr;
333 if (connector->override_edid && edid)
334 seq_write(m, edid->data, edid->length);
339 static int edid_open(struct inode *inode, struct file *file)
341 struct drm_connector *dev = inode->i_private;
343 return single_open(file, edid_show, dev);
346 static ssize_t edid_write(struct file *file, const char __user *ubuf,
347 size_t len, loff_t *offp)
349 struct seq_file *m = file->private_data;
350 struct drm_connector *connector = m->private;
355 buf = memdup_user(ubuf, len);
359 edid = (struct edid *) buf;
361 if (len == 5 && !strncmp(buf, "reset", 5)) {
362 connector->override_edid = false;
363 ret = drm_mode_connector_update_edid_property(connector, NULL);
364 } else if (len < EDID_LENGTH ||
365 EDID_LENGTH * (1 + edid->extensions) > len)
368 connector->override_edid = false;
369 ret = drm_mode_connector_update_edid_property(connector, edid);
371 connector->override_edid = true;
376 return (ret) ? ret : len;
379 static const struct file_operations drm_edid_fops = {
380 .owner = THIS_MODULE,
384 .release = single_release,
389 static const struct file_operations drm_connector_fops = {
390 .owner = THIS_MODULE,
391 .open = connector_open,
394 .release = single_release,
395 .write = connector_write
398 int drm_debugfs_connector_add(struct drm_connector *connector)
400 struct drm_minor *minor = connector->dev->primary;
401 struct dentry *root, *ent;
403 if (!minor->debugfs_root)
406 root = debugfs_create_dir(connector->name, minor->debugfs_root);
410 connector->debugfs_entry = root;
413 ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
414 &drm_connector_fops);
419 ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
420 connector, &drm_edid_fops);
427 debugfs_remove_recursive(connector->debugfs_entry);
428 connector->debugfs_entry = NULL;
432 void drm_debugfs_connector_remove(struct drm_connector *connector)
434 if (!connector->debugfs_entry)
437 debugfs_remove_recursive(connector->debugfs_entry);
439 connector->debugfs_entry = NULL;
442 int drm_debugfs_crtc_add(struct drm_crtc *crtc)
444 struct drm_minor *minor = crtc->dev->primary;
448 name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
452 root = debugfs_create_dir(name, minor->debugfs_root);
457 crtc->debugfs_entry = root;
459 if (drm_debugfs_crtc_crc_add(crtc))
465 drm_debugfs_crtc_remove(crtc);
469 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
471 debugfs_remove_recursive(crtc->debugfs_entry);
472 crtc->debugfs_entry = NULL;
475 #endif /* CONFIG_DEBUG_FS */