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_debugfs.h>
  32 #include <drm/drm_edid.h>
  33 #include <drm/drm_atomic.h>
  34 #include <drm/drmP.h>
  35
  36 #include "drm_internal.h"
  37 #include "drm_crtc_internal.h"
  38
  39 #if defined(CONFIG_DEBUG_FS)
  40
  41 /***************************************************
  42  * Initialization, etc.
  43  **************************************************/
  44
  45 static const struct drm_info_list drm_debugfs_list[] = {
  46         {"name", drm_name_info, 0},
  47         {"clients", drm_clients_info, 0},
  48         {"gem_names", drm_gem_name_info, DRIVER_GEM},
  49 };
  50 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
  51
  52
  53 static int drm_debugfs_open(struct inode *inode, struct file *file)
  54 {
  55         struct drm_info_node *node = inode->i_private;
  56
  57         return single_open(file, node->info_ent->show, node);
  58 }
  59
  60
  61 static const struct file_operations drm_debugfs_fops = {
  62         .owner = THIS_MODULE,
  63         .open = drm_debugfs_open,
  64         .read = seq_read,
  65         .llseek = seq_lseek,
  66         .release = single_release,
  67 };
  68
  69
  70 /**
  71  * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
  72  *                      minor
  73  * @files: The array of files to create
  74  * @count: The number of files given
  75  * @root: DRI debugfs dir entry.
  76  * @minor: device minor number
  77  *
  78  * Create a given set of debugfs files represented by an array of
  79  * &struct drm_info_list in the given root directory. These files will be removed
  80  * automatically on drm_debugfs_cleanup().
  81  */
  82 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
  83                              struct dentry *root, struct drm_minor *minor)
  84 {
  85         struct drm_device *dev = minor->dev;
  86         struct dentry *ent;
  87         struct drm_info_node *tmp;
  88         int i, ret;
  89
  90         for (i = 0; i < count; i++) {
  91                 u32 features = files[i].driver_features;
  92
  93                 if (features != 0 &&
  94                     (dev->driver->driver_features & features) != features)
  95                         continue;
  96
  97                 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
  98                 if (tmp == NULL) {
  99                         ret = -1;
 100                         goto fail;
 101                 }
 102                 ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
 103                                           root, tmp, &drm_debugfs_fops);
 104                 if (!ent) {
 105                         DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/%s\n",
 106                                   root, files[i].name);
 107                         kfree(tmp);
 108                         ret = -1;
 109                         goto fail;
 110                 }
 111
 112                 tmp->minor = minor;
 113                 tmp->dent = ent;
 114                 tmp->info_ent = &files[i];
 115
 116                 mutex_lock(&minor->debugfs_lock);
 117                 list_add(&tmp->list, &minor->debugfs_list);
 118                 mutex_unlock(&minor->debugfs_lock);
 119         }
 120         return 0;
 121
 122 fail:
 123         drm_debugfs_remove_files(files, count, minor);
 124         return ret;
 125 }
 126 EXPORT_SYMBOL(drm_debugfs_create_files);
 127
 128 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
 129                      struct dentry *root)
 130 {
 131         struct drm_device *dev = minor->dev;
 132         char name[64];
 133         int ret;
 134
 135         INIT_LIST_HEAD(&minor->debugfs_list);
 136         mutex_init(&minor->debugfs_lock);
 137         sprintf(name, "%d", minor_id);
 138         minor->debugfs_root = debugfs_create_dir(name, root);
 139         if (!minor->debugfs_root) {
 140                 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
 141                 return -1;
 142         }
 143
 144         ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
 145                                        minor->debugfs_root, minor);
 146         if (ret) {
 147                 debugfs_remove(minor->debugfs_root);
 148                 minor->debugfs_root = NULL;
 149                 DRM_ERROR("Failed to create core drm debugfs files\n");
 150                 return ret;
 151         }
 152
 153         if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
 154                 ret = drm_atomic_debugfs_init(minor);
 155                 if (ret) {
 156                         DRM_ERROR("Failed to create atomic debugfs files\n");
 157                         return ret;
 158                 }
 159         }
 160
 161         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 162                 ret = drm_framebuffer_debugfs_init(minor);
 163                 if (ret) {
 164                         DRM_ERROR("Failed to create framebuffer debugfs file\n");
 165                         return ret;
 166                 }
 167         }
 168
 169         if (dev->driver->debugfs_init) {
 170                 ret = dev->driver->debugfs_init(minor);
 171                 if (ret) {
 172                         DRM_ERROR("DRM: Driver failed to initialize "
 173                                   "/sys/kernel/debug/dri.\n");
 174                         return ret;
 175                 }
 176         }
 177         return 0;
 178 }
 179
 180
 181 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
 182                              struct drm_minor *minor)
 183 {
 184         struct list_head *pos, *q;
 185         struct drm_info_node *tmp;
 186         int i;
 187
 188         mutex_lock(&minor->debugfs_lock);
 189         for (i = 0; i < count; i++) {
 190                 list_for_each_safe(pos, q, &minor->debugfs_list) {
 191                         tmp = list_entry(pos, struct drm_info_node, list);
 192                         if (tmp->info_ent == &files[i]) {
 193                                 debugfs_remove(tmp->dent);
 194                                 list_del(pos);
 195                                 kfree(tmp);
 196                         }
 197                 }
 198         }
 199         mutex_unlock(&minor->debugfs_lock);
 200         return 0;
 201 }
 202 EXPORT_SYMBOL(drm_debugfs_remove_files);
 203
 204 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
 205 {
 206         struct drm_info_node *node, *tmp;
 207
 208         mutex_lock(&minor->debugfs_lock);
 209         list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
 210                 debugfs_remove(node->dent);
 211                 list_del(&node->list);
 212                 kfree(node);
 213         }
 214         mutex_unlock(&minor->debugfs_lock);
 215 }
 216
 217 int drm_debugfs_cleanup(struct drm_minor *minor)
 218 {
 219         if (!minor->debugfs_root)
 220                 return 0;
 221
 222         drm_debugfs_remove_all_files(minor);
 223
 224         debugfs_remove_recursive(minor->debugfs_root);
 225         minor->debugfs_root = NULL;
 226
 227         return 0;
 228 }
 229
 230 static int connector_show(struct seq_file *m, void *data)
 231 {
 232         struct drm_connector *connector = m->private;
 233
 234         seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
 235
 236         return 0;
 237 }
 238
 239 static int connector_open(struct inode *inode, struct file *file)
 240 {
 241         struct drm_connector *dev = inode->i_private;
 242
 243         return single_open(file, connector_show, dev);
 244 }
 245
 246 static ssize_t connector_write(struct file *file, const char __user *ubuf,
 247                                size_t len, loff_t *offp)
 248 {
 249         struct seq_file *m = file->private_data;
 250         struct drm_connector *connector = m->private;
 251         char buf[12];
 252
 253         if (len > sizeof(buf) - 1)
 254                 return -EINVAL;
 255
 256         if (copy_from_user(buf, ubuf, len))
 257                 return -EFAULT;
 258
 259         buf[len] = '\0';
 260
 261         if (!strcmp(buf, "on"))
 262                 connector->force = DRM_FORCE_ON;
 263         else if (!strcmp(buf, "digital"))
 264                 connector->force = DRM_FORCE_ON_DIGITAL;
 265         else if (!strcmp(buf, "off"))
 266                 connector->force = DRM_FORCE_OFF;
 267         else if (!strcmp(buf, "unspecified"))
 268                 connector->force = DRM_FORCE_UNSPECIFIED;
 269         else
 270                 return -EINVAL;
 271
 272         return len;
 273 }
 274
 275 static int edid_show(struct seq_file *m, void *data)
 276 {
 277         struct drm_connector *connector = m->private;
 278         struct drm_property_blob *edid = connector->edid_blob_ptr;
 279
 280         if (connector->override_edid && edid)
 281                 seq_write(m, edid->data, edid->length);
 282
 283         return 0;
 284 }
 285
 286 static int edid_open(struct inode *inode, struct file *file)
 287 {
 288         struct drm_connector *dev = inode->i_private;
 289
 290         return single_open(file, edid_show, dev);
 291 }
 292
 293 static ssize_t edid_write(struct file *file, const char __user *ubuf,
 294                           size_t len, loff_t *offp)
 295 {
 296         struct seq_file *m = file->private_data;
 297         struct drm_connector *connector = m->private;
 298         char *buf;
 299         struct edid *edid;
 300         int ret;
 301
 302         buf = memdup_user(ubuf, len);
 303         if (IS_ERR(buf))
 304                 return PTR_ERR(buf);
 305
 306         edid = (struct edid *) buf;
 307
 308         if (len == 5 && !strncmp(buf, "reset", 5)) {
 309                 connector->override_edid = false;
 310                 ret = drm_mode_connector_update_edid_property(connector, NULL);
 311         } else if (len < EDID_LENGTH ||
 312                    EDID_LENGTH * (1 + edid->extensions) > len)
 313                 ret = -EINVAL;
 314         else {
 315                 connector->override_edid = false;
 316                 ret = drm_mode_connector_update_edid_property(connector, edid);
 317                 if (!ret)
 318                         connector->override_edid = true;
 319         }
 320
 321         kfree(buf);
 322
 323         return (ret) ? ret : len;
 324 }
 325
 326 static const struct file_operations drm_edid_fops = {
 327         .owner = THIS_MODULE,
 328         .open = edid_open,
 329         .read = seq_read,
 330         .llseek = seq_lseek,
 331         .release = single_release,
 332         .write = edid_write
 333 };
 334
 335
 336 static const struct file_operations drm_connector_fops = {
 337         .owner = THIS_MODULE,
 338         .open = connector_open,
 339         .read = seq_read,
 340         .llseek = seq_lseek,
 341         .release = single_release,
 342         .write = connector_write
 343 };
 344
 345 int drm_debugfs_connector_add(struct drm_connector *connector)
 346 {
 347         struct drm_minor *minor = connector->dev->primary;
 348         struct dentry *root, *ent;
 349
 350         if (!minor->debugfs_root)
 351                 return -1;
 352
 353         root = debugfs_create_dir(connector->name, minor->debugfs_root);
 354         if (!root)
 355                 return -ENOMEM;
 356
 357         connector->debugfs_entry = root;
 358
 359         /* force */
 360         ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
 361                                   &drm_connector_fops);
 362         if (!ent)
 363                 goto error;
 364
 365         /* edid */
 366         ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
 367                                   connector, &drm_edid_fops);
 368         if (!ent)
 369                 goto error;
 370
 371         return 0;
 372
 373 error:
 374         debugfs_remove_recursive(connector->debugfs_entry);
 375         connector->debugfs_entry = NULL;
 376         return -ENOMEM;
 377 }
 378
 379 void drm_debugfs_connector_remove(struct drm_connector *connector)
 380 {
 381         if (!connector->debugfs_entry)
 382                 return;
 383
 384         debugfs_remove_recursive(connector->debugfs_entry);
 385
 386         connector->debugfs_entry = NULL;
 387 }
 388
 389 int drm_debugfs_crtc_add(struct drm_crtc *crtc)
 390 {
 391         struct drm_minor *minor = crtc->dev->primary;
 392         struct dentry *root;
 393         char *name;
 394
 395         name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
 396         if (!name)
 397                 return -ENOMEM;
 398
 399         root = debugfs_create_dir(name, minor->debugfs_root);
 400         kfree(name);
 401         if (!root)
 402                 return -ENOMEM;
 403
 404         crtc->debugfs_entry = root;
 405
 406         if (drm_debugfs_crtc_crc_add(crtc))
 407                 goto error;
 408
 409         return 0;
 410
 411 error:
 412         drm_debugfs_crtc_remove(crtc);
 413         return -ENOMEM;
 414 }
 415
 416 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
 417 {
 418         debugfs_remove_recursive(crtc->debugfs_entry);
 419         crtc->debugfs_entry = NULL;
 420 }
 421
 422 #endif /* CONFIG_DEBUG_FS */