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26 #include <linux/debugfs.h>
27 #include <linux/export.h>
28 #include <linux/seq_file.h>
29 #include <linux/slab.h>
30 #include <linux/uaccess.h>
32 #include <drm/drm_atomic.h>
33 #include <drm/drm_auth.h>
34 #include <drm/drm_bridge.h>
35 #include <drm/drm_client.h>
36 #include <drm/drm_debugfs.h>
37 #include <drm/drm_device.h>
38 #include <drm/drm_drv.h>
39 #include <drm/drm_edid.h>
40 #include <drm/drm_file.h>
41 #include <drm/drm_gem.h>
42 #include <drm/drm_managed.h>
43 #include <drm/drm_gpuva_mgr.h>
45 #include "drm_crtc_internal.h"
46 #include "drm_internal.h"
48 #if defined(CONFIG_DEBUG_FS)
50 /***************************************************
51 * Initialization, etc.
52 **************************************************/
54 static int drm_name_info(struct seq_file *m, void *data)
56 struct drm_debugfs_entry *entry = m->private;
57 struct drm_device *dev = entry->dev;
58 struct drm_master *master;
60 mutex_lock(&dev->master_mutex);
62 seq_printf(m, "%s", dev->driver->name);
64 seq_printf(m, " dev=%s", dev_name(dev->dev));
65 if (master && master->unique)
66 seq_printf(m, " master=%s", master->unique);
68 seq_printf(m, " unique=%s", dev->unique);
70 mutex_unlock(&dev->master_mutex);
75 static int drm_clients_info(struct seq_file *m, void *data)
77 struct drm_debugfs_entry *entry = m->private;
78 struct drm_device *dev = entry->dev;
79 struct drm_file *priv;
83 "%20s %5s %3s master a %5s %10s\n",
90 /* dev->filelist is sorted youngest first, but we want to present
91 * oldest first (i.e. kernel, servers, clients), so walk backwardss.
93 mutex_lock(&dev->filelist_mutex);
94 list_for_each_entry_reverse(priv, &dev->filelist, lhead) {
95 struct task_struct *task;
96 bool is_current_master = drm_is_current_master(priv);
98 rcu_read_lock(); /* locks pid_task()->comm */
99 task = pid_task(priv->pid, PIDTYPE_TGID);
100 uid = task ? __task_cred(task)->euid : GLOBAL_ROOT_UID;
101 seq_printf(m, "%20s %5d %3d %c %c %5d %10u\n",
102 task ? task->comm : "<unknown>",
105 is_current_master ? 'y' : 'n',
106 priv->authenticated ? 'y' : 'n',
107 from_kuid_munged(seq_user_ns(m), uid),
111 mutex_unlock(&dev->filelist_mutex);
115 static int drm_gem_one_name_info(int id, void *ptr, void *data)
117 struct drm_gem_object *obj = ptr;
118 struct seq_file *m = data;
120 seq_printf(m, "%6d %8zd %7d %8d\n",
121 obj->name, obj->size,
123 kref_read(&obj->refcount));
127 static int drm_gem_name_info(struct seq_file *m, void *data)
129 struct drm_debugfs_entry *entry = m->private;
130 struct drm_device *dev = entry->dev;
132 seq_printf(m, " name size handles refcount\n");
134 mutex_lock(&dev->object_name_lock);
135 idr_for_each(&dev->object_name_idr, drm_gem_one_name_info, m);
136 mutex_unlock(&dev->object_name_lock);
141 static const struct drm_debugfs_info drm_debugfs_list[] = {
142 {"name", drm_name_info, 0},
143 {"clients", drm_clients_info, 0},
144 {"gem_names", drm_gem_name_info, DRIVER_GEM},
146 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
149 static int drm_debugfs_open(struct inode *inode, struct file *file)
151 struct drm_info_node *node = inode->i_private;
153 return single_open(file, node->info_ent->show, node);
156 static int drm_debugfs_entry_open(struct inode *inode, struct file *file)
158 struct drm_debugfs_entry *entry = inode->i_private;
159 struct drm_debugfs_info *node = &entry->file;
161 return single_open(file, node->show, entry);
164 static const struct file_operations drm_debugfs_entry_fops = {
165 .owner = THIS_MODULE,
166 .open = drm_debugfs_entry_open,
169 .release = single_release,
172 static const struct file_operations drm_debugfs_fops = {
173 .owner = THIS_MODULE,
174 .open = drm_debugfs_open,
177 .release = single_release,
181 * drm_debugfs_gpuva_info - dump the given DRM GPU VA space
182 * @m: pointer to the &seq_file to write
183 * @mgr: the &drm_gpuva_manager representing the GPU VA space
185 * Dumps the GPU VA mappings of a given DRM GPU VA manager.
187 * For each DRM GPU VA space drivers should call this function from their
188 * &drm_info_list's show callback.
190 * Returns: 0 on success, -ENODEV if the &mgr is not initialized
192 int drm_debugfs_gpuva_info(struct seq_file *m,
193 struct drm_gpuva_manager *mgr)
195 struct drm_gpuva *va, *kva = &mgr->kernel_alloc_node;
200 seq_printf(m, "DRM GPU VA space (%s) [0x%016llx;0x%016llx]\n",
201 mgr->name, mgr->mm_start, mgr->mm_start + mgr->mm_range);
202 seq_printf(m, "Kernel reserved node [0x%016llx;0x%016llx]\n",
203 kva->va.addr, kva->va.addr + kva->va.range);
205 seq_puts(m, " VAs | start | range | end | object | object offset\n");
206 seq_puts(m, "-------------------------------------------------------------------------------------------------------------\n");
207 drm_gpuva_for_each_va(va, mgr) {
208 if (unlikely(va == kva))
211 seq_printf(m, " | 0x%016llx | 0x%016llx | 0x%016llx | 0x%016llx | 0x%016llx\n",
212 va->va.addr, va->va.range, va->va.addr + va->va.range,
213 (u64)(uintptr_t)va->gem.obj, va->gem.offset);
218 EXPORT_SYMBOL(drm_debugfs_gpuva_info);
221 * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
223 * @files: The array of files to create
224 * @count: The number of files given
225 * @root: DRI debugfs dir entry.
226 * @minor: device minor number
228 * Create a given set of debugfs files represented by an array of
229 * &struct drm_info_list in the given root directory. These files will be removed
230 * automatically on drm_debugfs_cleanup().
232 void drm_debugfs_create_files(const struct drm_info_list *files, int count,
233 struct dentry *root, struct drm_minor *minor)
235 struct drm_device *dev = minor->dev;
236 struct drm_info_node *tmp;
239 for (i = 0; i < count; i++) {
240 u32 features = files[i].driver_features;
242 if (features && !drm_core_check_all_features(dev, features))
245 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
250 tmp->dent = debugfs_create_file(files[i].name,
253 tmp->info_ent = &files[i];
255 mutex_lock(&minor->debugfs_lock);
256 list_add(&tmp->list, &minor->debugfs_list);
257 mutex_unlock(&minor->debugfs_lock);
260 EXPORT_SYMBOL(drm_debugfs_create_files);
262 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
265 struct drm_device *dev = minor->dev;
266 struct drm_debugfs_entry *entry, *tmp;
269 INIT_LIST_HEAD(&minor->debugfs_list);
270 mutex_init(&minor->debugfs_lock);
271 sprintf(name, "%d", minor_id);
272 minor->debugfs_root = debugfs_create_dir(name, root);
274 drm_debugfs_add_files(minor->dev, drm_debugfs_list, DRM_DEBUGFS_ENTRIES);
276 if (drm_drv_uses_atomic_modeset(dev)) {
277 drm_atomic_debugfs_init(minor);
278 drm_bridge_debugfs_init(minor);
281 if (drm_core_check_feature(dev, DRIVER_MODESET)) {
282 drm_framebuffer_debugfs_init(minor);
284 drm_client_debugfs_init(minor);
287 if (dev->driver->debugfs_init)
288 dev->driver->debugfs_init(minor);
290 list_for_each_entry_safe(entry, tmp, &dev->debugfs_list, list) {
291 debugfs_create_file(entry->file.name, 0444,
292 minor->debugfs_root, entry, &drm_debugfs_entry_fops);
293 list_del(&entry->list);
299 void drm_debugfs_late_register(struct drm_device *dev)
301 struct drm_minor *minor = dev->primary;
302 struct drm_debugfs_entry *entry, *tmp;
307 list_for_each_entry_safe(entry, tmp, &dev->debugfs_list, list) {
308 debugfs_create_file(entry->file.name, 0444,
309 minor->debugfs_root, entry, &drm_debugfs_entry_fops);
310 list_del(&entry->list);
314 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
315 struct drm_minor *minor)
317 struct list_head *pos, *q;
318 struct drm_info_node *tmp;
321 mutex_lock(&minor->debugfs_lock);
322 for (i = 0; i < count; i++) {
323 list_for_each_safe(pos, q, &minor->debugfs_list) {
324 tmp = list_entry(pos, struct drm_info_node, list);
325 if (tmp->info_ent == &files[i]) {
326 debugfs_remove(tmp->dent);
332 mutex_unlock(&minor->debugfs_lock);
335 EXPORT_SYMBOL(drm_debugfs_remove_files);
337 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
339 struct drm_info_node *node, *tmp;
341 mutex_lock(&minor->debugfs_lock);
342 list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
343 debugfs_remove(node->dent);
344 list_del(&node->list);
347 mutex_unlock(&minor->debugfs_lock);
350 void drm_debugfs_cleanup(struct drm_minor *minor)
352 if (!minor->debugfs_root)
355 drm_debugfs_remove_all_files(minor);
357 debugfs_remove_recursive(minor->debugfs_root);
358 minor->debugfs_root = NULL;
362 * drm_debugfs_add_file - Add a given file to the DRM device debugfs file list
363 * @dev: drm device for the ioctl
364 * @name: debugfs file name
365 * @show: show callback
366 * @data: driver-private data, should not be device-specific
368 * Add a given file entry to the DRM device debugfs file list to be created on
371 void drm_debugfs_add_file(struct drm_device *dev, const char *name,
372 int (*show)(struct seq_file*, void*), void *data)
374 struct drm_debugfs_entry *entry = drmm_kzalloc(dev, sizeof(*entry), GFP_KERNEL);
379 entry->file.name = name;
380 entry->file.show = show;
381 entry->file.data = data;
384 mutex_lock(&dev->debugfs_mutex);
385 list_add(&entry->list, &dev->debugfs_list);
386 mutex_unlock(&dev->debugfs_mutex);
388 EXPORT_SYMBOL(drm_debugfs_add_file);
391 * drm_debugfs_add_files - Add an array of files to the DRM device debugfs file list
392 * @dev: drm device for the ioctl
393 * @files: The array of files to create
394 * @count: The number of files given
396 * Add a given set of debugfs files represented by an array of
397 * &struct drm_debugfs_info in the DRM device debugfs file list.
399 void drm_debugfs_add_files(struct drm_device *dev, const struct drm_debugfs_info *files, int count)
403 for (i = 0; i < count; i++)
404 drm_debugfs_add_file(dev, files[i].name, files[i].show, files[i].data);
406 EXPORT_SYMBOL(drm_debugfs_add_files);
408 static int connector_show(struct seq_file *m, void *data)
410 struct drm_connector *connector = m->private;
412 seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
417 static int connector_open(struct inode *inode, struct file *file)
419 struct drm_connector *dev = inode->i_private;
421 return single_open(file, connector_show, dev);
424 static ssize_t connector_write(struct file *file, const char __user *ubuf,
425 size_t len, loff_t *offp)
427 struct seq_file *m = file->private_data;
428 struct drm_connector *connector = m->private;
431 if (len > sizeof(buf) - 1)
434 if (copy_from_user(buf, ubuf, len))
439 if (sysfs_streq(buf, "on"))
440 connector->force = DRM_FORCE_ON;
441 else if (sysfs_streq(buf, "digital"))
442 connector->force = DRM_FORCE_ON_DIGITAL;
443 else if (sysfs_streq(buf, "off"))
444 connector->force = DRM_FORCE_OFF;
445 else if (sysfs_streq(buf, "unspecified"))
446 connector->force = DRM_FORCE_UNSPECIFIED;
453 static int edid_show(struct seq_file *m, void *data)
455 return drm_edid_override_show(m->private, m);
458 static int edid_open(struct inode *inode, struct file *file)
460 struct drm_connector *dev = inode->i_private;
462 return single_open(file, edid_show, dev);
465 static ssize_t edid_write(struct file *file, const char __user *ubuf,
466 size_t len, loff_t *offp)
468 struct seq_file *m = file->private_data;
469 struct drm_connector *connector = m->private;
473 buf = memdup_user(ubuf, len);
477 if (len == 5 && !strncmp(buf, "reset", 5))
478 ret = drm_edid_override_reset(connector);
480 ret = drm_edid_override_set(connector, buf, len);
484 return ret ? ret : len;
488 * Returns the min and max vrr vfreq through the connector's debugfs file.
489 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range
491 static int vrr_range_show(struct seq_file *m, void *data)
493 struct drm_connector *connector = m->private;
495 if (connector->status != connector_status_connected)
498 seq_printf(m, "Min: %u\n", connector->display_info.monitor_range.min_vfreq);
499 seq_printf(m, "Max: %u\n", connector->display_info.monitor_range.max_vfreq);
503 DEFINE_SHOW_ATTRIBUTE(vrr_range);
506 * Returns Connector's max supported bpc through debugfs file.
507 * Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
509 static int output_bpc_show(struct seq_file *m, void *data)
511 struct drm_connector *connector = m->private;
513 if (connector->status != connector_status_connected)
516 seq_printf(m, "Maximum: %u\n", connector->display_info.bpc);
520 DEFINE_SHOW_ATTRIBUTE(output_bpc);
522 static const struct file_operations drm_edid_fops = {
523 .owner = THIS_MODULE,
527 .release = single_release,
532 static const struct file_operations drm_connector_fops = {
533 .owner = THIS_MODULE,
534 .open = connector_open,
537 .release = single_release,
538 .write = connector_write
541 void drm_debugfs_connector_add(struct drm_connector *connector)
543 struct drm_minor *minor = connector->dev->primary;
546 if (!minor->debugfs_root)
549 root = debugfs_create_dir(connector->name, minor->debugfs_root);
550 connector->debugfs_entry = root;
553 debugfs_create_file("force", 0644, root, connector,
554 &drm_connector_fops);
557 debugfs_create_file("edid_override", 0644, root, connector,
561 debugfs_create_file("vrr_range", 0444, root, connector,
565 debugfs_create_file("output_bpc", 0444, root, connector,
568 if (connector->funcs->debugfs_init)
569 connector->funcs->debugfs_init(connector, root);
572 void drm_debugfs_connector_remove(struct drm_connector *connector)
574 if (!connector->debugfs_entry)
577 debugfs_remove_recursive(connector->debugfs_entry);
579 connector->debugfs_entry = NULL;
582 void drm_debugfs_crtc_add(struct drm_crtc *crtc)
584 struct drm_minor *minor = crtc->dev->primary;
588 name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
592 root = debugfs_create_dir(name, minor->debugfs_root);
595 crtc->debugfs_entry = root;
597 drm_debugfs_crtc_crc_add(crtc);
600 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
602 debugfs_remove_recursive(crtc->debugfs_entry);
603 crtc->debugfs_entry = NULL;
606 #endif /* CONFIG_DEBUG_FS */