drivers/gpu/drm/drm_debugfs.c

   1 /*
   2  * Created: Sun Dec 21 13:08:50 2008 by bgamari@gmail.com
   3  *
   4  * Copyright 2008 Ben Gamari <bgamari@gmail.com>
   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/seq_file.h>
  28 #include <linux/slab.h>
  29 #include <linux/export.h>
  30
  31 #include <drm/drm_client.h>
  32 #include <drm/drm_debugfs.h>
  33 #include <drm/drm_edid.h>
  34 #include <drm/drm_atomic.h>
  35 #include <drm/drm_auth.h>
  36 #include <drm/drm_gem.h>
  37 #include <drm/drmP.h>
  38
  39 #include "drm_internal.h"
  40 #include "drm_crtc_internal.h"
  41
  42 #if defined(CONFIG_DEBUG_FS)
  43
  44 /***************************************************
  45  * Initialization, etc.
  46  **************************************************/
  47
  48 static int drm_name_info(struct seq_file *m, void *data)
  49 {
  50         struct drm_info_node *node = (struct drm_info_node *) m->private;
  51         struct drm_minor *minor = node->minor;
  52         struct drm_device *dev = minor->dev;
  53         struct drm_master *master;
  54
  55         mutex_lock(&dev->master_mutex);
  56         master = dev->master;
  57         seq_printf(m, "%s", dev->driver->name);
  58         if (dev->dev)
  59                 seq_printf(m, " dev=%s", dev_name(dev->dev));
  60         if (master && master->unique)
  61                 seq_printf(m, " master=%s", master->unique);
  62         if (dev->unique)
  63                 seq_printf(m, " unique=%s", dev->unique);
  64         seq_printf(m, "\n");
  65         mutex_unlock(&dev->master_mutex);
  66
  67         return 0;
  68 }
  69
  70 static int drm_clients_info(struct seq_file *m, void *data)
  71 {
  72         struct drm_info_node *node = (struct drm_info_node *) m->private;
  73         struct drm_device *dev = node->minor->dev;
  74         struct drm_file *priv;
  75         kuid_t uid;
  76
  77         seq_printf(m,
  78                    "%20s %5s %3s master a %5s %10s\n",
  79                    "command",
  80                    "pid",
  81                    "dev",
  82                    "uid",
  83                    "magic");
  84
  85         /* dev->filelist is sorted youngest first, but we want to present
  86          * oldest first (i.e. kernel, servers, clients), so walk backwardss.
  87          */
  88         mutex_lock(&dev->filelist_mutex);
  89         list_for_each_entry_reverse(priv, &dev->filelist, lhead) {
  90                 struct task_struct *task;
  91
  92                 rcu_read_lock(); /* locks pid_task()->comm */
  93                 task = pid_task(priv->pid, PIDTYPE_PID);
  94                 uid = task ? __task_cred(task)->euid : GLOBAL_ROOT_UID;
  95                 seq_printf(m, "%20s %5d %3d   %c    %c %5d %10u\n",
  96                            task ? task->comm : "<unknown>",
  97                            pid_vnr(priv->pid),
  98                            priv->minor->index,
  99                            drm_is_current_master(priv) ? 'y' : 'n',
 100                            priv->authenticated ? 'y' : 'n',
 101                            from_kuid_munged(seq_user_ns(m), uid),
 102                            priv->magic);
 103                 rcu_read_unlock();
 104         }
 105         mutex_unlock(&dev->filelist_mutex);
 106         return 0;
 107 }
 108
 109 static int drm_gem_one_name_info(int id, void *ptr, void *data)
 110 {
 111         struct drm_gem_object *obj = ptr;
 112         struct seq_file *m = data;
 113
 114         seq_printf(m, "%6d %8zd %7d %8d\n",
 115                    obj->name, obj->size,
 116                    obj->handle_count,
 117                    kref_read(&obj->refcount));
 118         return 0;
 119 }
 120
 121 static int drm_gem_name_info(struct seq_file *m, void *data)
 122 {
 123         struct drm_info_node *node = (struct drm_info_node *) m->private;
 124         struct drm_device *dev = node->minor->dev;
 125
 126         seq_printf(m, "  name     size handles refcount\n");
 127
 128         mutex_lock(&dev->object_name_lock);
 129         idr_for_each(&dev->object_name_idr, drm_gem_one_name_info, m);
 130         mutex_unlock(&dev->object_name_lock);
 131
 132         return 0;
 133 }
 134
 135 static const struct drm_info_list drm_debugfs_list[] = {
 136         {"name", drm_name_info, 0},
 137         {"clients", drm_clients_info, 0},
 138         {"gem_names", drm_gem_name_info, DRIVER_GEM},
 139 };
 140 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
 141
 142
 143 static int drm_debugfs_open(struct inode *inode, struct file *file)
 144 {
 145         struct drm_info_node *node = inode->i_private;
 146
 147         return single_open(file, node->info_ent->show, node);
 148 }
 149
 150
 151 static const struct file_operations drm_debugfs_fops = {
 152         .owner = THIS_MODULE,
 153         .open = drm_debugfs_open,
 154         .read = seq_read,
 155         .llseek = seq_lseek,
 156         .release = single_release,
 157 };
 158
 159
 160 /**
 161  * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
 162  *                      minor
 163  * @files: The array of files to create
 164  * @count: The number of files given
 165  * @root: DRI debugfs dir entry.
 166  * @minor: device minor number
 167  *
 168  * Create a given set of debugfs files represented by an array of
 169  * &struct drm_info_list in the given root directory. These files will be removed
 170  * automatically on drm_debugfs_cleanup().
 171  */
 172 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
 173                              struct dentry *root, struct drm_minor *minor)
 174 {
 175         struct drm_device *dev = minor->dev;
 176         struct dentry *ent;
 177         struct drm_info_node *tmp;
 178         int i, ret;
 179
 180         for (i = 0; i < count; i++) {
 181                 u32 features = files[i].driver_features;
 182
 183                 if (features != 0 &&
 184                     (dev->driver->driver_features & features) != features)
 185                         continue;
 186
 187                 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
 188                 if (tmp == NULL) {
 189                         ret = -1;
 190                         goto fail;
 191                 }
 192                 ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
 193                                           root, tmp, &drm_debugfs_fops);
 194                 if (!ent) {
 195                         DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/%s\n",
 196                                   root, files[i].name);
 197                         kfree(tmp);
 198                         ret = -1;
 199                         goto fail;
 200                 }
 201
 202                 tmp->minor = minor;
 203                 tmp->dent = ent;
 204                 tmp->info_ent = &files[i];
 205
 206                 mutex_lock(&minor->debugfs_lock);
 207                 list_add(&tmp->list, &minor->debugfs_list);
 208                 mutex_unlock(&minor->debugfs_lock);
 209         }
 210         return 0;
 211
 212 fail:
 213         drm_debugfs_remove_files(files, count, minor);
 214         return ret;
 215 }
 216 EXPORT_SYMBOL(drm_debugfs_create_files);
 217
 218 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
 219                      struct dentry *root)
 220 {
 221         struct drm_device *dev = minor->dev;
 222         char name[64];
 223         int ret;
 224
 225         INIT_LIST_HEAD(&minor->debugfs_list);
 226         mutex_init(&minor->debugfs_lock);
 227         sprintf(name, "%d", minor_id);
 228         minor->debugfs_root = debugfs_create_dir(name, root);
 229         if (!minor->debugfs_root) {
 230                 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
 231                 return -1;
 232         }
 233
 234         ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
 235                                        minor->debugfs_root, minor);
 236         if (ret) {
 237                 debugfs_remove(minor->debugfs_root);
 238                 minor->debugfs_root = NULL;
 239                 DRM_ERROR("Failed to create core drm debugfs files\n");
 240                 return ret;
 241         }
 242
 243         if (drm_drv_uses_atomic_modeset(dev)) {
 244                 ret = drm_atomic_debugfs_init(minor);
 245                 if (ret) {
 246                         DRM_ERROR("Failed to create atomic debugfs files\n");
 247                         return ret;
 248                 }
 249         }
 250
 251         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 252                 ret = drm_framebuffer_debugfs_init(minor);
 253                 if (ret) {
 254                         DRM_ERROR("Failed to create framebuffer debugfs file\n");
 255                         return ret;
 256                 }
 257
 258                 ret = drm_client_debugfs_init(minor);
 259                 if (ret) {
 260                         DRM_ERROR("Failed to create client debugfs file\n");
 261                         return ret;
 262                 }
 263         }
 264
 265         if (dev->driver->debugfs_init) {
 266                 ret = dev->driver->debugfs_init(minor);
 267                 if (ret) {
 268                         DRM_ERROR("DRM: Driver failed to initialize "
 269                                   "/sys/kernel/debug/dri.\n");
 270                         return ret;
 271                 }
 272         }
 273         return 0;
 274 }
 275
 276
 277 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
 278                              struct drm_minor *minor)
 279 {
 280         struct list_head *pos, *q;
 281         struct drm_info_node *tmp;
 282         int i;
 283
 284         mutex_lock(&minor->debugfs_lock);
 285         for (i = 0; i < count; i++) {
 286                 list_for_each_safe(pos, q, &minor->debugfs_list) {
 287                         tmp = list_entry(pos, struct drm_info_node, list);
 288                         if (tmp->info_ent == &files[i]) {
 289                                 debugfs_remove(tmp->dent);
 290                                 list_del(pos);
 291                                 kfree(tmp);
 292                         }
 293                 }
 294         }
 295         mutex_unlock(&minor->debugfs_lock);
 296         return 0;
 297 }
 298 EXPORT_SYMBOL(drm_debugfs_remove_files);
 299
 300 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
 301 {
 302         struct drm_info_node *node, *tmp;
 303
 304         mutex_lock(&minor->debugfs_lock);
 305         list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
 306                 debugfs_remove(node->dent);
 307                 list_del(&node->list);
 308                 kfree(node);
 309         }
 310         mutex_unlock(&minor->debugfs_lock);
 311 }
 312
 313 int drm_debugfs_cleanup(struct drm_minor *minor)
 314 {
 315         if (!minor->debugfs_root)
 316                 return 0;
 317
 318         drm_debugfs_remove_all_files(minor);
 319
 320         debugfs_remove_recursive(minor->debugfs_root);
 321         minor->debugfs_root = NULL;
 322
 323         return 0;
 324 }
 325
 326 static int connector_show(struct seq_file *m, void *data)
 327 {
 328         struct drm_connector *connector = m->private;
 329
 330         seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
 331
 332         return 0;
 333 }
 334
 335 static int connector_open(struct inode *inode, struct file *file)
 336 {
 337         struct drm_connector *dev = inode->i_private;
 338
 339         return single_open(file, connector_show, dev);
 340 }
 341
 342 static ssize_t connector_write(struct file *file, const char __user *ubuf,
 343                                size_t len, loff_t *offp)
 344 {
 345         struct seq_file *m = file->private_data;
 346         struct drm_connector *connector = m->private;
 347         char buf[12];
 348
 349         if (len > sizeof(buf) - 1)
 350                 return -EINVAL;
 351
 352         if (copy_from_user(buf, ubuf, len))
 353                 return -EFAULT;
 354
 355         buf[len] = '\0';
 356
 357         if (!strcmp(buf, "on"))
 358                 connector->force = DRM_FORCE_ON;
 359         else if (!strcmp(buf, "digital"))
 360                 connector->force = DRM_FORCE_ON_DIGITAL;
 361         else if (!strcmp(buf, "off"))
 362                 connector->force = DRM_FORCE_OFF;
 363         else if (!strcmp(buf, "unspecified"))
 364                 connector->force = DRM_FORCE_UNSPECIFIED;
 365         else
 366                 return -EINVAL;
 367
 368         return len;
 369 }
 370
 371 static int edid_show(struct seq_file *m, void *data)
 372 {
 373         struct drm_connector *connector = m->private;
 374         struct drm_property_blob *edid = connector->edid_blob_ptr;
 375
 376         if (connector->override_edid && edid)
 377                 seq_write(m, edid->data, edid->length);
 378
 379         return 0;
 380 }
 381
 382 static int edid_open(struct inode *inode, struct file *file)
 383 {
 384         struct drm_connector *dev = inode->i_private;
 385
 386         return single_open(file, edid_show, dev);
 387 }
 388
 389 static ssize_t edid_write(struct file *file, const char __user *ubuf,
 390                           size_t len, loff_t *offp)
 391 {
 392         struct seq_file *m = file->private_data;
 393         struct drm_connector *connector = m->private;
 394         char *buf;
 395         struct edid *edid;
 396         int ret;
 397
 398         buf = memdup_user(ubuf, len);
 399         if (IS_ERR(buf))
 400                 return PTR_ERR(buf);
 401
 402         edid = (struct edid *) buf;
 403
 404         if (len == 5 && !strncmp(buf, "reset", 5)) {
 405                 connector->override_edid = false;
 406                 ret = drm_connector_update_edid_property(connector, NULL);
 407         } else if (len < EDID_LENGTH ||
 408                    EDID_LENGTH * (1 + edid->extensions) > len)
 409                 ret = -EINVAL;
 410         else {
 411                 connector->override_edid = false;
 412                 ret = drm_connector_update_edid_property(connector, edid);
 413                 if (!ret)
 414                         connector->override_edid = true;
 415         }
 416
 417         kfree(buf);
 418
 419         return (ret) ? ret : len;
 420 }
 421
 422 static const struct file_operations drm_edid_fops = {
 423         .owner = THIS_MODULE,
 424         .open = edid_open,
 425         .read = seq_read,
 426         .llseek = seq_lseek,
 427         .release = single_release,
 428         .write = edid_write
 429 };
 430
 431
 432 static const struct file_operations drm_connector_fops = {
 433         .owner = THIS_MODULE,
 434         .open = connector_open,
 435         .read = seq_read,
 436         .llseek = seq_lseek,
 437         .release = single_release,
 438         .write = connector_write
 439 };
 440
 441 int drm_debugfs_connector_add(struct drm_connector *connector)
 442 {
 443         struct drm_minor *minor = connector->dev->primary;
 444         struct dentry *root, *ent;
 445
 446         if (!minor->debugfs_root)
 447                 return -1;
 448
 449         root = debugfs_create_dir(connector->name, minor->debugfs_root);
 450         if (!root)
 451                 return -ENOMEM;
 452
 453         connector->debugfs_entry = root;
 454
 455         /* force */
 456         ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
 457                                   &drm_connector_fops);
 458         if (!ent)
 459                 goto error;
 460
 461         /* edid */
 462         ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
 463                                   connector, &drm_edid_fops);
 464         if (!ent)
 465                 goto error;
 466
 467         return 0;
 468
 469 error:
 470         debugfs_remove_recursive(connector->debugfs_entry);
 471         connector->debugfs_entry = NULL;
 472         return -ENOMEM;
 473 }
 474
 475 void drm_debugfs_connector_remove(struct drm_connector *connector)
 476 {
 477         if (!connector->debugfs_entry)
 478                 return;
 479
 480         debugfs_remove_recursive(connector->debugfs_entry);
 481
 482         connector->debugfs_entry = NULL;
 483 }
 484
 485 int drm_debugfs_crtc_add(struct drm_crtc *crtc)
 486 {
 487         struct drm_minor *minor = crtc->dev->primary;
 488         struct dentry *root;
 489         char *name;
 490
 491         name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
 492         if (!name)
 493                 return -ENOMEM;
 494
 495         root = debugfs_create_dir(name, minor->debugfs_root);
 496         kfree(name);
 497         if (!root)
 498                 return -ENOMEM;
 499
 500         crtc->debugfs_entry = root;
 501
 502         if (drm_debugfs_crtc_crc_add(crtc))
 503                 goto error;
 504
 505         return 0;
 506
 507 error:
 508         drm_debugfs_crtc_remove(crtc);
 509         return -ENOMEM;
 510 }
 511
 512 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
 513 {
 514         debugfs_remove_recursive(crtc->debugfs_entry);
 515         crtc->debugfs_entry = NULL;
 516 }
 517
 518 #endif /* CONFIG_DEBUG_FS */