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"
42 #if defined(CONFIG_DEBUG_FS)
44 /***************************************************
45 * Initialization, etc.
46 **************************************************/
48 static const struct drm_info_list drm_debugfs_list[] = {
49 {"name", drm_name_info, 0},
50 {"clients", drm_clients_info, 0},
51 {"gem_names", drm_gem_name_info, DRIVER_GEM},
53 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
56 static int drm_debugfs_open(struct inode *inode, struct file *file)
58 struct drm_info_node *node = inode->i_private;
60 return single_open(file, node->info_ent->show, node);
64 static const struct file_operations drm_debugfs_fops = {
66 .open = drm_debugfs_open,
69 .release = single_release,
74 * Initialize a given set of debugfs files for a device
76 * \param files The array of files to create
77 * \param count The number of files given
78 * \param root DRI debugfs dir entry.
79 * \param minor device minor number
80 * \return Zero on success, non-zero on failure
82 * Create a given set of debugfs files represented by an array of
83 * gdm_debugfs_lists in the given root directory.
85 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
86 struct dentry *root, struct drm_minor *minor)
88 struct drm_device *dev = minor->dev;
90 struct drm_info_node *tmp;
93 for (i = 0; i < count; i++) {
94 u32 features = files[i].driver_features;
97 (dev->driver->driver_features & features) != features)
100 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
105 ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
106 root, tmp, &drm_debugfs_fops);
108 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/%s\n",
109 root, files[i].name);
117 tmp->info_ent = &files[i];
119 mutex_lock(&minor->debugfs_lock);
120 list_add(&tmp->list, &minor->debugfs_list);
121 mutex_unlock(&minor->debugfs_lock);
126 drm_debugfs_remove_files(files, count, minor);
129 EXPORT_SYMBOL(drm_debugfs_create_files);
132 * Initialize the DRI debugfs filesystem for a device
134 * \param dev DRM device
135 * \param minor device minor number
136 * \param root DRI debugfs dir entry.
138 * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry
139 * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as
140 * "/sys/kernel/debug/dri/%minor%/%name%".
142 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
145 struct drm_device *dev = minor->dev;
149 INIT_LIST_HEAD(&minor->debugfs_list);
150 mutex_init(&minor->debugfs_lock);
151 sprintf(name, "%d", minor_id);
152 minor->debugfs_root = debugfs_create_dir(name, root);
153 if (!minor->debugfs_root) {
154 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
158 ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
159 minor->debugfs_root, minor);
161 debugfs_remove(minor->debugfs_root);
162 minor->debugfs_root = NULL;
163 DRM_ERROR("Failed to create core drm debugfs files\n");
167 if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
168 ret = drm_atomic_debugfs_init(minor);
170 DRM_ERROR("Failed to create atomic debugfs files\n");
175 if (dev->driver->debugfs_init) {
176 ret = dev->driver->debugfs_init(minor);
178 DRM_ERROR("DRM: Driver failed to initialize "
179 "/sys/kernel/debug/dri.\n");
188 * Remove a list of debugfs files
190 * \param files The list of files
191 * \param count The number of files
192 * \param minor The minor of which we should remove the files
193 * \return always zero.
195 * Remove all debugfs entries created by debugfs_init().
197 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
198 struct drm_minor *minor)
200 struct list_head *pos, *q;
201 struct drm_info_node *tmp;
204 mutex_lock(&minor->debugfs_lock);
205 for (i = 0; i < count; i++) {
206 list_for_each_safe(pos, q, &minor->debugfs_list) {
207 tmp = list_entry(pos, struct drm_info_node, list);
208 if (tmp->info_ent == &files[i]) {
209 debugfs_remove(tmp->dent);
215 mutex_unlock(&minor->debugfs_lock);
218 EXPORT_SYMBOL(drm_debugfs_remove_files);
221 * Cleanup the debugfs filesystem resources.
223 * \param minor device minor number.
224 * \return always zero.
226 * Remove all debugfs entries created by debugfs_init().
228 int drm_debugfs_cleanup(struct drm_minor *minor)
230 struct drm_device *dev = minor->dev;
233 if (!minor->debugfs_root)
236 if (dev->driver->debugfs_cleanup)
237 dev->driver->debugfs_cleanup(minor);
239 if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
240 ret = drm_atomic_debugfs_cleanup(minor);
242 DRM_ERROR("DRM: Failed to remove atomic debugfs entries\n");
247 drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
249 debugfs_remove(minor->debugfs_root);
250 minor->debugfs_root = NULL;
255 static int connector_show(struct seq_file *m, void *data)
257 struct drm_connector *connector = m->private;
260 switch (connector->force) {
265 case DRM_FORCE_ON_DIGITAL:
266 status = "digital\n";
273 case DRM_FORCE_UNSPECIFIED:
274 status = "unspecified\n";
286 static int connector_open(struct inode *inode, struct file *file)
288 struct drm_connector *dev = inode->i_private;
290 return single_open(file, connector_show, dev);
293 static ssize_t connector_write(struct file *file, const char __user *ubuf,
294 size_t len, loff_t *offp)
296 struct seq_file *m = file->private_data;
297 struct drm_connector *connector = m->private;
300 if (len > sizeof(buf) - 1)
303 if (copy_from_user(buf, ubuf, len))
308 if (!strcmp(buf, "on"))
309 connector->force = DRM_FORCE_ON;
310 else if (!strcmp(buf, "digital"))
311 connector->force = DRM_FORCE_ON_DIGITAL;
312 else if (!strcmp(buf, "off"))
313 connector->force = DRM_FORCE_OFF;
314 else if (!strcmp(buf, "unspecified"))
315 connector->force = DRM_FORCE_UNSPECIFIED;
322 static int edid_show(struct seq_file *m, void *data)
324 struct drm_connector *connector = m->private;
325 struct drm_property_blob *edid = connector->edid_blob_ptr;
327 if (connector->override_edid && edid)
328 seq_write(m, edid->data, edid->length);
333 static int edid_open(struct inode *inode, struct file *file)
335 struct drm_connector *dev = inode->i_private;
337 return single_open(file, edid_show, dev);
340 static ssize_t edid_write(struct file *file, const char __user *ubuf,
341 size_t len, loff_t *offp)
343 struct seq_file *m = file->private_data;
344 struct drm_connector *connector = m->private;
349 buf = memdup_user(ubuf, len);
353 edid = (struct edid *) buf;
355 if (len == 5 && !strncmp(buf, "reset", 5)) {
356 connector->override_edid = false;
357 ret = drm_mode_connector_update_edid_property(connector, NULL);
358 } else if (len < EDID_LENGTH ||
359 EDID_LENGTH * (1 + edid->extensions) > len)
362 connector->override_edid = false;
363 ret = drm_mode_connector_update_edid_property(connector, edid);
365 connector->override_edid = true;
370 return (ret) ? ret : len;
373 static const struct file_operations drm_edid_fops = {
374 .owner = THIS_MODULE,
378 .release = single_release,
383 static const struct file_operations drm_connector_fops = {
384 .owner = THIS_MODULE,
385 .open = connector_open,
388 .release = single_release,
389 .write = connector_write
392 int drm_debugfs_connector_add(struct drm_connector *connector)
394 struct drm_minor *minor = connector->dev->primary;
395 struct dentry *root, *ent;
397 if (!minor->debugfs_root)
400 root = debugfs_create_dir(connector->name, minor->debugfs_root);
404 connector->debugfs_entry = root;
407 ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
408 &drm_connector_fops);
413 ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
414 connector, &drm_edid_fops);
421 debugfs_remove_recursive(connector->debugfs_entry);
422 connector->debugfs_entry = NULL;
426 void drm_debugfs_connector_remove(struct drm_connector *connector)
428 if (!connector->debugfs_entry)
431 debugfs_remove_recursive(connector->debugfs_entry);
433 connector->debugfs_entry = NULL;
436 int drm_debugfs_crtc_add(struct drm_crtc *crtc)
438 struct drm_minor *minor = crtc->dev->primary;
442 name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
446 root = debugfs_create_dir(name, minor->debugfs_root);
451 crtc->debugfs_entry = root;
453 if (drm_debugfs_crtc_crc_add(crtc))
459 drm_debugfs_crtc_remove(crtc);
463 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
465 debugfs_remove_recursive(crtc->debugfs_entry);
466 crtc->debugfs_entry = NULL;
469 #endif /* CONFIG_DEBUG_FS */