drivers/gpu/drm/drm_debugfs.c

   1 /*
   2  * Created: Sun Dec 21 13:08:50 2008 by [email protected]
   3  *
   4  * Copyright 2008 Ben Gamari <[email protected]>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  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>
  31
  32 #include <drm/drm_atomic.h>
  33 #include <drm/drm_auth.h>
  34 #include <drm/drm_client.h>
  35 #include <drm/drm_debugfs.h>
  36 #include <drm/drm_device.h>
  37 #include <drm/drm_drv.h>
  38 #include <drm/drm_edid.h>
  39 #include <drm/drm_file.h>
  40 #include <drm/drm_gem.h>
  41 #include <drm/drm_managed.h>
  42
  43 #include "drm_crtc_internal.h"
  44 #include "drm_internal.h"
  45
  46 #if defined(CONFIG_DEBUG_FS)
  47
  48 /***************************************************
  49  * Initialization, etc.
  50  **************************************************/
  51
  52 static int drm_name_info(struct seq_file *m, void *data)
  53 {
  54         struct drm_debugfs_entry *entry = m->private;
  55         struct drm_device *dev = entry->dev;
  56         struct drm_master *master;
  57
  58         mutex_lock(&dev->master_mutex);
  59         master = dev->master;
  60         seq_printf(m, "%s", dev->driver->name);
  61         if (dev->dev)
  62                 seq_printf(m, " dev=%s", dev_name(dev->dev));
  63         if (master && master->unique)
  64                 seq_printf(m, " master=%s", master->unique);
  65         if (dev->unique)
  66                 seq_printf(m, " unique=%s", dev->unique);
  67         seq_printf(m, "\n");
  68         mutex_unlock(&dev->master_mutex);
  69
  70         return 0;
  71 }
  72
  73 static int drm_clients_info(struct seq_file *m, void *data)
  74 {
  75         struct drm_debugfs_entry *entry = m->private;
  76         struct drm_device *dev = entry->dev;
  77         struct drm_file *priv;
  78         kuid_t uid;
  79
  80         seq_printf(m,
  81                    "%20s %5s %3s master a %5s %10s\n",
  82                    "command",
  83                    "tgid",
  84                    "dev",
  85                    "uid",
  86                    "magic");
  87
  88         /* dev->filelist is sorted youngest first, but we want to present
  89          * oldest first (i.e. kernel, servers, clients), so walk backwardss.
  90          */
  91         mutex_lock(&dev->filelist_mutex);
  92         list_for_each_entry_reverse(priv, &dev->filelist, lhead) {
  93                 struct task_struct *task;
  94                 bool is_current_master = drm_is_current_master(priv);
  95
  96                 rcu_read_lock(); /* locks pid_task()->comm */
  97                 task = pid_task(priv->pid, PIDTYPE_TGID);
  98                 uid = task ? __task_cred(task)->euid : GLOBAL_ROOT_UID;
  99                 seq_printf(m, "%20s %5d %3d   %c    %c %5d %10u\n",
 100                            task ? task->comm : "<unknown>",
 101                            pid_vnr(priv->pid),
 102                            priv->minor->index,
 103                            is_current_master ? 'y' : 'n',
 104                            priv->authenticated ? 'y' : 'n',
 105                            from_kuid_munged(seq_user_ns(m), uid),
 106                            priv->magic);
 107                 rcu_read_unlock();
 108         }
 109         mutex_unlock(&dev->filelist_mutex);
 110         return 0;
 111 }
 112
 113 static int drm_gem_one_name_info(int id, void *ptr, void *data)
 114 {
 115         struct drm_gem_object *obj = ptr;
 116         struct seq_file *m = data;
 117
 118         seq_printf(m, "%6d %8zd %7d %8d\n",
 119                    obj->name, obj->size,
 120                    obj->handle_count,
 121                    kref_read(&obj->refcount));
 122         return 0;
 123 }
 124
 125 static int drm_gem_name_info(struct seq_file *m, void *data)
 126 {
 127         struct drm_debugfs_entry *entry = m->private;
 128         struct drm_device *dev = entry->dev;
 129
 130         seq_printf(m, "  name     size handles refcount\n");
 131
 132         mutex_lock(&dev->object_name_lock);
 133         idr_for_each(&dev->object_name_idr, drm_gem_one_name_info, m);
 134         mutex_unlock(&dev->object_name_lock);
 135
 136         return 0;
 137 }
 138
 139 static const struct drm_debugfs_info drm_debugfs_list[] = {
 140         {"name", drm_name_info, 0},
 141         {"clients", drm_clients_info, 0},
 142         {"gem_names", drm_gem_name_info, DRIVER_GEM},
 143 };
 144 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
 145
 146
 147 static int drm_debugfs_open(struct inode *inode, struct file *file)
 148 {
 149         struct drm_info_node *node = inode->i_private;
 150
 151         return single_open(file, node->info_ent->show, node);
 152 }
 153
 154 static int drm_debugfs_entry_open(struct inode *inode, struct file *file)
 155 {
 156         struct drm_debugfs_entry *entry = inode->i_private;
 157         struct drm_debugfs_info *node = &entry->file;
 158
 159         return single_open(file, node->show, entry);
 160 }
 161
 162 static const struct file_operations drm_debugfs_entry_fops = {
 163         .owner = THIS_MODULE,
 164         .open = drm_debugfs_entry_open,
 165         .read = seq_read,
 166         .llseek = seq_lseek,
 167         .release = single_release,
 168 };
 169
 170 static const struct file_operations drm_debugfs_fops = {
 171         .owner = THIS_MODULE,
 172         .open = drm_debugfs_open,
 173         .read = seq_read,
 174         .llseek = seq_lseek,
 175         .release = single_release,
 176 };
 177
 178
 179 /**
 180  * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
 181  *                      minor
 182  * @files: The array of files to create
 183  * @count: The number of files given
 184  * @root: DRI debugfs dir entry.
 185  * @minor: device minor number
 186  *
 187  * Create a given set of debugfs files represented by an array of
 188  * &struct drm_info_list in the given root directory. These files will be removed
 189  * automatically on drm_debugfs_cleanup().
 190  */
 191 void drm_debugfs_create_files(const struct drm_info_list *files, int count,
 192                               struct dentry *root, struct drm_minor *minor)
 193 {
 194         struct drm_device *dev = minor->dev;
 195         struct drm_info_node *tmp;
 196         int i;
 197
 198         for (i = 0; i < count; i++) {
 199                 u32 features = files[i].driver_features;
 200
 201                 if (features && !drm_core_check_all_features(dev, features))
 202                         continue;
 203
 204                 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
 205                 if (tmp == NULL)
 206                         continue;
 207
 208                 tmp->minor = minor;
 209                 tmp->dent = debugfs_create_file(files[i].name,
 210                                                 0444, root, tmp,
 211                                                 &drm_debugfs_fops);
 212                 tmp->info_ent = &files[i];
 213
 214                 mutex_lock(&minor->debugfs_lock);
 215                 list_add(&tmp->list, &minor->debugfs_list);
 216                 mutex_unlock(&minor->debugfs_lock);
 217         }
 218 }
 219 EXPORT_SYMBOL(drm_debugfs_create_files);
 220
 221 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
 222                      struct dentry *root)
 223 {
 224         struct drm_device *dev = minor->dev;
 225         struct drm_debugfs_entry *entry, *tmp;
 226         char name[64];
 227
 228         INIT_LIST_HEAD(&minor->debugfs_list);
 229         mutex_init(&minor->debugfs_lock);
 230         sprintf(name, "%d", minor_id);
 231         minor->debugfs_root = debugfs_create_dir(name, root);
 232
 233         drm_debugfs_add_files(minor->dev, drm_debugfs_list, DRM_DEBUGFS_ENTRIES);
 234
 235         if (drm_drv_uses_atomic_modeset(dev)) {
 236                 drm_atomic_debugfs_init(minor);
 237         }
 238
 239         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 240                 drm_framebuffer_debugfs_init(minor);
 241
 242                 drm_client_debugfs_init(minor);
 243         }
 244
 245         if (dev->driver->debugfs_init)
 246                 dev->driver->debugfs_init(minor);
 247
 248         list_for_each_entry_safe(entry, tmp, &dev->debugfs_list, list) {
 249                 debugfs_create_file(entry->file.name, 0444,
 250                                     minor->debugfs_root, entry, &drm_debugfs_entry_fops);
 251                 list_del(&entry->list);
 252         }
 253
 254         return 0;
 255 }
 256
 257 void drm_debugfs_late_register(struct drm_device *dev)
 258 {
 259         struct drm_minor *minor = dev->primary;
 260         struct drm_debugfs_entry *entry, *tmp;
 261
 262         if (!minor)
 263                 return;
 264
 265         list_for_each_entry_safe(entry, tmp, &dev->debugfs_list, list) {
 266                 debugfs_create_file(entry->file.name, 0444,
 267                                     minor->debugfs_root, entry, &drm_debugfs_entry_fops);
 268                 list_del(&entry->list);
 269         }
 270 }
 271
 272 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
 273                              struct drm_minor *minor)
 274 {
 275         struct list_head *pos, *q;
 276         struct drm_info_node *tmp;
 277         int i;
 278
 279         mutex_lock(&minor->debugfs_lock);
 280         for (i = 0; i < count; i++) {
 281                 list_for_each_safe(pos, q, &minor->debugfs_list) {
 282                         tmp = list_entry(pos, struct drm_info_node, list);
 283                         if (tmp->info_ent == &files[i]) {
 284                                 debugfs_remove(tmp->dent);
 285                                 list_del(pos);
 286                                 kfree(tmp);
 287                         }
 288                 }
 289         }
 290         mutex_unlock(&minor->debugfs_lock);
 291         return 0;
 292 }
 293 EXPORT_SYMBOL(drm_debugfs_remove_files);
 294
 295 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
 296 {
 297         struct drm_info_node *node, *tmp;
 298
 299         mutex_lock(&minor->debugfs_lock);
 300         list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
 301                 debugfs_remove(node->dent);
 302                 list_del(&node->list);
 303                 kfree(node);
 304         }
 305         mutex_unlock(&minor->debugfs_lock);
 306 }
 307
 308 void drm_debugfs_cleanup(struct drm_minor *minor)
 309 {
 310         if (!minor->debugfs_root)
 311                 return;
 312
 313         drm_debugfs_remove_all_files(minor);
 314
 315         debugfs_remove_recursive(minor->debugfs_root);
 316         minor->debugfs_root = NULL;
 317 }
 318
 319 /**
 320  * drm_debugfs_add_file - Add a given file to the DRM device debugfs file list
 321  * @dev: drm device for the ioctl
 322  * @name: debugfs file name
 323  * @show: show callback
 324  * @data: driver-private data, should not be device-specific
 325  *
 326  * Add a given file entry to the DRM device debugfs file list to be created on
 327  * drm_debugfs_init.
 328  */
 329 void drm_debugfs_add_file(struct drm_device *dev, const char *name,
 330                           int (*show)(struct seq_file*, void*), void *data)
 331 {
 332         struct drm_debugfs_entry *entry = drmm_kzalloc(dev, sizeof(*entry), GFP_KERNEL);
 333
 334         if (!entry)
 335                 return;
 336
 337         entry->file.name = name;
 338         entry->file.show = show;
 339         entry->file.data = data;
 340         entry->dev = dev;
 341
 342         mutex_lock(&dev->debugfs_mutex);
 343         list_add(&entry->list, &dev->debugfs_list);
 344         mutex_unlock(&dev->debugfs_mutex);
 345 }
 346 EXPORT_SYMBOL(drm_debugfs_add_file);
 347
 348 /**
 349  * drm_debugfs_add_files - Add an array of files to the DRM device debugfs file list
 350  * @dev: drm device for the ioctl
 351  * @files: The array of files to create
 352  * @count: The number of files given
 353  *
 354  * Add a given set of debugfs files represented by an array of
 355  * &struct drm_debugfs_info in the DRM device debugfs file list.
 356  */
 357 void drm_debugfs_add_files(struct drm_device *dev, const struct drm_debugfs_info *files, int count)
 358 {
 359         int i;
 360
 361         for (i = 0; i < count; i++)
 362                 drm_debugfs_add_file(dev, files[i].name, files[i].show, files[i].data);
 363 }
 364 EXPORT_SYMBOL(drm_debugfs_add_files);
 365
 366 static int connector_show(struct seq_file *m, void *data)
 367 {
 368         struct drm_connector *connector = m->private;
 369
 370         seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
 371
 372         return 0;
 373 }
 374
 375 static int connector_open(struct inode *inode, struct file *file)
 376 {
 377         struct drm_connector *dev = inode->i_private;
 378
 379         return single_open(file, connector_show, dev);
 380 }
 381
 382 static ssize_t connector_write(struct file *file, const char __user *ubuf,
 383                                size_t len, loff_t *offp)
 384 {
 385         struct seq_file *m = file->private_data;
 386         struct drm_connector *connector = m->private;
 387         char buf[12];
 388
 389         if (len > sizeof(buf) - 1)
 390                 return -EINVAL;
 391
 392         if (copy_from_user(buf, ubuf, len))
 393                 return -EFAULT;
 394
 395         buf[len] = '\0';
 396
 397         if (sysfs_streq(buf, "on"))
 398                 connector->force = DRM_FORCE_ON;
 399         else if (sysfs_streq(buf, "digital"))
 400                 connector->force = DRM_FORCE_ON_DIGITAL;
 401         else if (sysfs_streq(buf, "off"))
 402                 connector->force = DRM_FORCE_OFF;
 403         else if (sysfs_streq(buf, "unspecified"))
 404                 connector->force = DRM_FORCE_UNSPECIFIED;
 405         else
 406                 return -EINVAL;
 407
 408         return len;
 409 }
 410
 411 static int edid_show(struct seq_file *m, void *data)
 412 {
 413         return drm_edid_override_show(m->private, m);
 414 }
 415
 416 static int edid_open(struct inode *inode, struct file *file)
 417 {
 418         struct drm_connector *dev = inode->i_private;
 419
 420         return single_open(file, edid_show, dev);
 421 }
 422
 423 static ssize_t edid_write(struct file *file, const char __user *ubuf,
 424                           size_t len, loff_t *offp)
 425 {
 426         struct seq_file *m = file->private_data;
 427         struct drm_connector *connector = m->private;
 428         char *buf;
 429         int ret;
 430
 431         buf = memdup_user(ubuf, len);
 432         if (IS_ERR(buf))
 433                 return PTR_ERR(buf);
 434
 435         if (len == 5 && !strncmp(buf, "reset", 5))
 436                 ret = drm_edid_override_reset(connector);
 437         else
 438                 ret = drm_edid_override_set(connector, buf, len);
 439
 440         kfree(buf);
 441
 442         return ret ? ret : len;
 443 }
 444
 445 /*
 446  * Returns the min and max vrr vfreq through the connector's debugfs file.
 447  * Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range
 448  */
 449 static int vrr_range_show(struct seq_file *m, void *data)
 450 {
 451         struct drm_connector *connector = m->private;
 452
 453         if (connector->status != connector_status_connected)
 454                 return -ENODEV;
 455
 456         seq_printf(m, "Min: %u\n", connector->display_info.monitor_range.min_vfreq);
 457         seq_printf(m, "Max: %u\n", connector->display_info.monitor_range.max_vfreq);
 458
 459         return 0;
 460 }
 461 DEFINE_SHOW_ATTRIBUTE(vrr_range);
 462
 463 /*
 464  * Returns Connector's max supported bpc through debugfs file.
 465  * Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
 466  */
 467 static int output_bpc_show(struct seq_file *m, void *data)
 468 {
 469         struct drm_connector *connector = m->private;
 470
 471         if (connector->status != connector_status_connected)
 472                 return -ENODEV;
 473
 474         seq_printf(m, "Maximum: %u\n", connector->display_info.bpc);
 475
 476         return 0;
 477 }
 478 DEFINE_SHOW_ATTRIBUTE(output_bpc);
 479
 480 static const struct file_operations drm_edid_fops = {
 481         .owner = THIS_MODULE,
 482         .open = edid_open,
 483         .read = seq_read,
 484         .llseek = seq_lseek,
 485         .release = single_release,
 486         .write = edid_write
 487 };
 488
 489
 490 static const struct file_operations drm_connector_fops = {
 491         .owner = THIS_MODULE,
 492         .open = connector_open,
 493         .read = seq_read,
 494         .llseek = seq_lseek,
 495         .release = single_release,
 496         .write = connector_write
 497 };
 498
 499 void drm_debugfs_connector_add(struct drm_connector *connector)
 500 {
 501         struct drm_minor *minor = connector->dev->primary;
 502         struct dentry *root;
 503
 504         if (!minor->debugfs_root)
 505                 return;
 506
 507         root = debugfs_create_dir(connector->name, minor->debugfs_root);
 508         connector->debugfs_entry = root;
 509
 510         /* force */
 511         debugfs_create_file("force", 0644, root, connector,
 512                             &drm_connector_fops);
 513
 514         /* edid */
 515         debugfs_create_file("edid_override", 0644, root, connector,
 516                             &drm_edid_fops);
 517
 518         /* vrr range */
 519         debugfs_create_file("vrr_range", 0444, root, connector,
 520                             &vrr_range_fops);
 521
 522         /* max bpc */
 523         debugfs_create_file("output_bpc", 0444, root, connector,
 524                             &output_bpc_fops);
 525
 526         if (connector->funcs->debugfs_init)
 527                 connector->funcs->debugfs_init(connector, root);
 528 }
 529
 530 void drm_debugfs_connector_remove(struct drm_connector *connector)
 531 {
 532         if (!connector->debugfs_entry)
 533                 return;
 534
 535         debugfs_remove_recursive(connector->debugfs_entry);
 536
 537         connector->debugfs_entry = NULL;
 538 }
 539
 540 void drm_debugfs_crtc_add(struct drm_crtc *crtc)
 541 {
 542         struct drm_minor *minor = crtc->dev->primary;
 543         struct dentry *root;
 544         char *name;
 545
 546         name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
 547         if (!name)
 548                 return;
 549
 550         root = debugfs_create_dir(name, minor->debugfs_root);
 551         kfree(name);
 552
 553         crtc->debugfs_entry = root;
 554
 555         drm_debugfs_crtc_crc_add(crtc);
 556 }
 557
 558 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
 559 {
 560         debugfs_remove_recursive(crtc->debugfs_entry);
 561         crtc->debugfs_entry = NULL;
 562 }
 563
 564 #endif /* CONFIG_DEBUG_FS */