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/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
  42 #include "drm_crtc_internal.h"
  43 #include "drm_internal.h"
  44
  45 #if defined(CONFIG_DEBUG_FS)
  46
  47 /***************************************************
  48  * Initialization, etc.
  49  **************************************************/
  50
  51 static int drm_name_info(struct seq_file *m, void *data)
  52 {
  53         struct drm_info_node *node = (struct drm_info_node *) m->private;
  54         struct drm_minor *minor = node->minor;
  55         struct drm_device *dev = minor->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_info_node *node = (struct drm_info_node *) m->private;
  76         struct drm_device *dev = node->minor->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                    "pid",
  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
  95                 rcu_read_lock(); /* locks pid_task()->comm */
  96                 task = pid_task(priv->pid, PIDTYPE_PID);
  97                 uid = task ? __task_cred(task)->euid : GLOBAL_ROOT_UID;
  98                 seq_printf(m, "%20s %5d %3d   %c    %c %5d %10u\n",
  99                            task ? task->comm : "<unknown>",
 100                            pid_vnr(priv->pid),
 101                            priv->minor->index,
 102                            drm_is_current_master(priv) ? 'y' : 'n',
 103                            priv->authenticated ? 'y' : 'n',
 104                            from_kuid_munged(seq_user_ns(m), uid),
 105                            priv->magic);
 106                 rcu_read_unlock();
 107         }
 108         mutex_unlock(&dev->filelist_mutex);
 109         return 0;
 110 }
 111
 112 static int drm_gem_one_name_info(int id, void *ptr, void *data)
 113 {
 114         struct drm_gem_object *obj = ptr;
 115         struct seq_file *m = data;
 116
 117         seq_printf(m, "%6d %8zd %7d %8d\n",
 118                    obj->name, obj->size,
 119                    obj->handle_count,
 120                    kref_read(&obj->refcount));
 121         return 0;
 122 }
 123
 124 static int drm_gem_name_info(struct seq_file *m, void *data)
 125 {
 126         struct drm_info_node *node = (struct drm_info_node *) m->private;
 127         struct drm_device *dev = node->minor->dev;
 128
 129         seq_printf(m, "  name     size handles refcount\n");
 130
 131         mutex_lock(&dev->object_name_lock);
 132         idr_for_each(&dev->object_name_idr, drm_gem_one_name_info, m);
 133         mutex_unlock(&dev->object_name_lock);
 134
 135         return 0;
 136 }
 137
 138 static const struct drm_info_list drm_debugfs_list[] = {
 139         {"name", drm_name_info, 0},
 140         {"clients", drm_clients_info, 0},
 141         {"gem_names", drm_gem_name_info, DRIVER_GEM},
 142 };
 143 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
 144
 145
 146 static int drm_debugfs_open(struct inode *inode, struct file *file)
 147 {
 148         struct drm_info_node *node = inode->i_private;
 149
 150         return single_open(file, node->info_ent->show, node);
 151 }
 152
 153
 154 static const struct file_operations drm_debugfs_fops = {
 155         .owner = THIS_MODULE,
 156         .open = drm_debugfs_open,
 157         .read = seq_read,
 158         .llseek = seq_lseek,
 159         .release = single_release,
 160 };
 161
 162
 163 /**
 164  * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
 165  *                      minor
 166  * @files: The array of files to create
 167  * @count: The number of files given
 168  * @root: DRI debugfs dir entry.
 169  * @minor: device minor number
 170  *
 171  * Create a given set of debugfs files represented by an array of
 172  * &struct drm_info_list in the given root directory. These files will be removed
 173  * automatically on drm_debugfs_cleanup().
 174  */
 175 void drm_debugfs_create_files(const struct drm_info_list *files, int count,
 176                               struct dentry *root, struct drm_minor *minor)
 177 {
 178         struct drm_device *dev = minor->dev;
 179         struct drm_info_node *tmp;
 180         int i;
 181
 182         for (i = 0; i < count; i++) {
 183                 u32 features = files[i].driver_features;
 184
 185                 if (features && !drm_core_check_all_features(dev, features))
 186                         continue;
 187
 188                 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
 189                 if (tmp == NULL)
 190                         continue;
 191
 192                 tmp->minor = minor;
 193                 tmp->dent = debugfs_create_file(files[i].name,
 194                                                 S_IFREG | S_IRUGO, root, tmp,
 195                                                 &drm_debugfs_fops);
 196                 tmp->info_ent = &files[i];
 197
 198                 mutex_lock(&minor->debugfs_lock);
 199                 list_add(&tmp->list, &minor->debugfs_list);
 200                 mutex_unlock(&minor->debugfs_lock);
 201         }
 202 }
 203 EXPORT_SYMBOL(drm_debugfs_create_files);
 204
 205 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
 206                      struct dentry *root)
 207 {
 208         struct drm_device *dev = minor->dev;
 209         char name[64];
 210
 211         INIT_LIST_HEAD(&minor->debugfs_list);
 212         mutex_init(&minor->debugfs_lock);
 213         sprintf(name, "%d", minor_id);
 214         minor->debugfs_root = debugfs_create_dir(name, root);
 215
 216         drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
 217                                  minor->debugfs_root, minor);
 218
 219         if (drm_drv_uses_atomic_modeset(dev)) {
 220                 drm_atomic_debugfs_init(minor);
 221         }
 222
 223         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 224                 drm_framebuffer_debugfs_init(minor);
 225
 226                 drm_client_debugfs_init(minor);
 227         }
 228
 229         if (dev->driver->debugfs_init)
 230                 dev->driver->debugfs_init(minor);
 231
 232         return 0;
 233 }
 234
 235
 236 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
 237                              struct drm_minor *minor)
 238 {
 239         struct list_head *pos, *q;
 240         struct drm_info_node *tmp;
 241         int i;
 242
 243         mutex_lock(&minor->debugfs_lock);
 244         for (i = 0; i < count; i++) {
 245                 list_for_each_safe(pos, q, &minor->debugfs_list) {
 246                         tmp = list_entry(pos, struct drm_info_node, list);
 247                         if (tmp->info_ent == &files[i]) {
 248                                 debugfs_remove(tmp->dent);
 249                                 list_del(pos);
 250                                 kfree(tmp);
 251                         }
 252                 }
 253         }
 254         mutex_unlock(&minor->debugfs_lock);
 255         return 0;
 256 }
 257 EXPORT_SYMBOL(drm_debugfs_remove_files);
 258
 259 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
 260 {
 261         struct drm_info_node *node, *tmp;
 262
 263         mutex_lock(&minor->debugfs_lock);
 264         list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
 265                 debugfs_remove(node->dent);
 266                 list_del(&node->list);
 267                 kfree(node);
 268         }
 269         mutex_unlock(&minor->debugfs_lock);
 270 }
 271
 272 void drm_debugfs_cleanup(struct drm_minor *minor)
 273 {
 274         if (!minor->debugfs_root)
 275                 return;
 276
 277         drm_debugfs_remove_all_files(minor);
 278
 279         debugfs_remove_recursive(minor->debugfs_root);
 280         minor->debugfs_root = NULL;
 281 }
 282
 283 static int connector_show(struct seq_file *m, void *data)
 284 {
 285         struct drm_connector *connector = m->private;
 286
 287         seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
 288
 289         return 0;
 290 }
 291
 292 static int connector_open(struct inode *inode, struct file *file)
 293 {
 294         struct drm_connector *dev = inode->i_private;
 295
 296         return single_open(file, connector_show, dev);
 297 }
 298
 299 static ssize_t connector_write(struct file *file, const char __user *ubuf,
 300                                size_t len, loff_t *offp)
 301 {
 302         struct seq_file *m = file->private_data;
 303         struct drm_connector *connector = m->private;
 304         char buf[12];
 305
 306         if (len > sizeof(buf) - 1)
 307                 return -EINVAL;
 308
 309         if (copy_from_user(buf, ubuf, len))
 310                 return -EFAULT;
 311
 312         buf[len] = '\0';
 313
 314         if (sysfs_streq(buf, "on"))
 315                 connector->force = DRM_FORCE_ON;
 316         else if (sysfs_streq(buf, "digital"))
 317                 connector->force = DRM_FORCE_ON_DIGITAL;
 318         else if (sysfs_streq(buf, "off"))
 319                 connector->force = DRM_FORCE_OFF;
 320         else if (sysfs_streq(buf, "unspecified"))
 321                 connector->force = DRM_FORCE_UNSPECIFIED;
 322         else
 323                 return -EINVAL;
 324
 325         return len;
 326 }
 327
 328 static int edid_show(struct seq_file *m, void *data)
 329 {
 330         struct drm_connector *connector = m->private;
 331         struct drm_property_blob *edid = connector->edid_blob_ptr;
 332
 333         if (connector->override_edid && edid)
 334                 seq_write(m, edid->data, edid->length);
 335
 336         return 0;
 337 }
 338
 339 static int edid_open(struct inode *inode, struct file *file)
 340 {
 341         struct drm_connector *dev = inode->i_private;
 342
 343         return single_open(file, edid_show, dev);
 344 }
 345
 346 static ssize_t edid_write(struct file *file, const char __user *ubuf,
 347                           size_t len, loff_t *offp)
 348 {
 349         struct seq_file *m = file->private_data;
 350         struct drm_connector *connector = m->private;
 351         char *buf;
 352         struct edid *edid;
 353         int ret;
 354
 355         buf = memdup_user(ubuf, len);
 356         if (IS_ERR(buf))
 357                 return PTR_ERR(buf);
 358
 359         edid = (struct edid *) buf;
 360
 361         if (len == 5 && !strncmp(buf, "reset", 5)) {
 362                 connector->override_edid = false;
 363                 ret = drm_connector_update_edid_property(connector, NULL);
 364         } else if (len < EDID_LENGTH ||
 365                    EDID_LENGTH * (1 + edid->extensions) > len)
 366                 ret = -EINVAL;
 367         else {
 368                 connector->override_edid = false;
 369                 ret = drm_connector_update_edid_property(connector, edid);
 370                 if (!ret)
 371                         connector->override_edid = true;
 372         }
 373
 374         kfree(buf);
 375
 376         return (ret) ? ret : len;
 377 }
 378
 379 /*
 380  * Returns the min and max vrr vfreq through the connector's debugfs file.
 381  * Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range
 382  */
 383 static int vrr_range_show(struct seq_file *m, void *data)
 384 {
 385         struct drm_connector *connector = m->private;
 386
 387         if (connector->status != connector_status_connected)
 388                 return -ENODEV;
 389
 390         seq_printf(m, "Min: %u\n", (u8)connector->display_info.monitor_range.min_vfreq);
 391         seq_printf(m, "Max: %u\n", (u8)connector->display_info.monitor_range.max_vfreq);
 392
 393         return 0;
 394 }
 395 DEFINE_SHOW_ATTRIBUTE(vrr_range);
 396
 397 static const struct file_operations drm_edid_fops = {
 398         .owner = THIS_MODULE,
 399         .open = edid_open,
 400         .read = seq_read,
 401         .llseek = seq_lseek,
 402         .release = single_release,
 403         .write = edid_write
 404 };
 405
 406
 407 static const struct file_operations drm_connector_fops = {
 408         .owner = THIS_MODULE,
 409         .open = connector_open,
 410         .read = seq_read,
 411         .llseek = seq_lseek,
 412         .release = single_release,
 413         .write = connector_write
 414 };
 415
 416 void drm_debugfs_connector_add(struct drm_connector *connector)
 417 {
 418         struct drm_minor *minor = connector->dev->primary;
 419         struct dentry *root;
 420
 421         if (!minor->debugfs_root)
 422                 return;
 423
 424         root = debugfs_create_dir(connector->name, minor->debugfs_root);
 425         connector->debugfs_entry = root;
 426
 427         /* force */
 428         debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
 429                             &drm_connector_fops);
 430
 431         /* edid */
 432         debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root, connector,
 433                             &drm_edid_fops);
 434
 435         /* vrr range */
 436         debugfs_create_file("vrr_range", S_IRUGO, root, connector,
 437                             &vrr_range_fops);
 438 }
 439
 440 void drm_debugfs_connector_remove(struct drm_connector *connector)
 441 {
 442         if (!connector->debugfs_entry)
 443                 return;
 444
 445         debugfs_remove_recursive(connector->debugfs_entry);
 446
 447         connector->debugfs_entry = NULL;
 448 }
 449
 450 void drm_debugfs_crtc_add(struct drm_crtc *crtc)
 451 {
 452         struct drm_minor *minor = crtc->dev->primary;
 453         struct dentry *root;
 454         char *name;
 455
 456         name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
 457         if (!name)
 458                 return;
 459
 460         root = debugfs_create_dir(name, minor->debugfs_root);
 461         kfree(name);
 462
 463         crtc->debugfs_entry = root;
 464
 465         drm_debugfs_crtc_crc_add(crtc);
 466 }
 467
 468 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
 469 {
 470         debugfs_remove_recursive(crtc->debugfs_entry);
 471         crtc->debugfs_entry = NULL;
 472 }
 473
 474 #endif /* CONFIG_DEBUG_FS */