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/drmP.h>
  36
  37 #include "drm_internal.h"
  38 #include "drm_crtc_internal.h"
  39
  40 #if defined(CONFIG_DEBUG_FS)
  41
  42 /***************************************************
  43  * Initialization, etc.
  44  **************************************************/
  45
  46 static const struct drm_info_list drm_debugfs_list[] = {
  47         {"name", drm_name_info, 0},
  48         {"clients", drm_clients_info, 0},
  49         {"gem_names", drm_gem_name_info, DRIVER_GEM},
  50 };
  51 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
  52
  53
  54 static int drm_debugfs_open(struct inode *inode, struct file *file)
  55 {
  56         struct drm_info_node *node = inode->i_private;
  57
  58         return single_open(file, node->info_ent->show, node);
  59 }
  60
  61
  62 static const struct file_operations drm_debugfs_fops = {
  63         .owner = THIS_MODULE,
  64         .open = drm_debugfs_open,
  65         .read = seq_read,
  66         .llseek = seq_lseek,
  67         .release = single_release,
  68 };
  69
  70
  71 /**
  72  * drm_debugfs_create_files - Initialize a given set of debugfs files for DRM
  73  *                      minor
  74  * @files: The array of files to create
  75  * @count: The number of files given
  76  * @root: DRI debugfs dir entry.
  77  * @minor: device minor number
  78  *
  79  * Create a given set of debugfs files represented by an array of
  80  * &struct drm_info_list in the given root directory. These files will be removed
  81  * automatically on drm_debugfs_cleanup().
  82  */
  83 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
  84                              struct dentry *root, struct drm_minor *minor)
  85 {
  86         struct drm_device *dev = minor->dev;
  87         struct dentry *ent;
  88         struct drm_info_node *tmp;
  89         int i, ret;
  90
  91         for (i = 0; i < count; i++) {
  92                 u32 features = files[i].driver_features;
  93
  94                 if (features != 0 &&
  95                     (dev->driver->driver_features & features) != features)
  96                         continue;
  97
  98                 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
  99                 if (tmp == NULL) {
 100                         ret = -1;
 101                         goto fail;
 102                 }
 103                 ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
 104                                           root, tmp, &drm_debugfs_fops);
 105                 if (!ent) {
 106                         DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/%s\n",
 107                                   root, files[i].name);
 108                         kfree(tmp);
 109                         ret = -1;
 110                         goto fail;
 111                 }
 112
 113                 tmp->minor = minor;
 114                 tmp->dent = ent;
 115                 tmp->info_ent = &files[i];
 116
 117                 mutex_lock(&minor->debugfs_lock);
 118                 list_add(&tmp->list, &minor->debugfs_list);
 119                 mutex_unlock(&minor->debugfs_lock);
 120         }
 121         return 0;
 122
 123 fail:
 124         drm_debugfs_remove_files(files, count, minor);
 125         return ret;
 126 }
 127 EXPORT_SYMBOL(drm_debugfs_create_files);
 128
 129 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
 130                      struct dentry *root)
 131 {
 132         struct drm_device *dev = minor->dev;
 133         char name[64];
 134         int ret;
 135
 136         INIT_LIST_HEAD(&minor->debugfs_list);
 137         mutex_init(&minor->debugfs_lock);
 138         sprintf(name, "%d", minor_id);
 139         minor->debugfs_root = debugfs_create_dir(name, root);
 140         if (!minor->debugfs_root) {
 141                 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
 142                 return -1;
 143         }
 144
 145         ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
 146                                        minor->debugfs_root, minor);
 147         if (ret) {
 148                 debugfs_remove(minor->debugfs_root);
 149                 minor->debugfs_root = NULL;
 150                 DRM_ERROR("Failed to create core drm debugfs files\n");
 151                 return ret;
 152         }
 153
 154         if (drm_drv_uses_atomic_modeset(dev)) {
 155                 ret = drm_atomic_debugfs_init(minor);
 156                 if (ret) {
 157                         DRM_ERROR("Failed to create atomic debugfs files\n");
 158                         return ret;
 159                 }
 160         }
 161
 162         if (drm_core_check_feature(dev, DRIVER_MODESET)) {
 163                 ret = drm_framebuffer_debugfs_init(minor);
 164                 if (ret) {
 165                         DRM_ERROR("Failed to create framebuffer debugfs file\n");
 166                         return ret;
 167                 }
 168
 169                 ret = drm_client_debugfs_init(minor);
 170                 if (ret) {
 171                         DRM_ERROR("Failed to create client debugfs file\n");
 172                         return ret;
 173                 }
 174         }
 175
 176         if (dev->driver->debugfs_init) {
 177                 ret = dev->driver->debugfs_init(minor);
 178                 if (ret) {
 179                         DRM_ERROR("DRM: Driver failed to initialize "
 180                                   "/sys/kernel/debug/dri.\n");
 181                         return ret;
 182                 }
 183         }
 184         return 0;
 185 }
 186
 187
 188 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
 189                              struct drm_minor *minor)
 190 {
 191         struct list_head *pos, *q;
 192         struct drm_info_node *tmp;
 193         int i;
 194
 195         mutex_lock(&minor->debugfs_lock);
 196         for (i = 0; i < count; i++) {
 197                 list_for_each_safe(pos, q, &minor->debugfs_list) {
 198                         tmp = list_entry(pos, struct drm_info_node, list);
 199                         if (tmp->info_ent == &files[i]) {
 200                                 debugfs_remove(tmp->dent);
 201                                 list_del(pos);
 202                                 kfree(tmp);
 203                         }
 204                 }
 205         }
 206         mutex_unlock(&minor->debugfs_lock);
 207         return 0;
 208 }
 209 EXPORT_SYMBOL(drm_debugfs_remove_files);
 210
 211 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
 212 {
 213         struct drm_info_node *node, *tmp;
 214
 215         mutex_lock(&minor->debugfs_lock);
 216         list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
 217                 debugfs_remove(node->dent);
 218                 list_del(&node->list);
 219                 kfree(node);
 220         }
 221         mutex_unlock(&minor->debugfs_lock);
 222 }
 223
 224 int drm_debugfs_cleanup(struct drm_minor *minor)
 225 {
 226         if (!minor->debugfs_root)
 227                 return 0;
 228
 229         drm_debugfs_remove_all_files(minor);
 230
 231         debugfs_remove_recursive(minor->debugfs_root);
 232         minor->debugfs_root = NULL;
 233
 234         return 0;
 235 }
 236
 237 static int connector_show(struct seq_file *m, void *data)
 238 {
 239         struct drm_connector *connector = m->private;
 240
 241         seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
 242
 243         return 0;
 244 }
 245
 246 static int connector_open(struct inode *inode, struct file *file)
 247 {
 248         struct drm_connector *dev = inode->i_private;
 249
 250         return single_open(file, connector_show, dev);
 251 }
 252
 253 static ssize_t connector_write(struct file *file, const char __user *ubuf,
 254                                size_t len, loff_t *offp)
 255 {
 256         struct seq_file *m = file->private_data;
 257         struct drm_connector *connector = m->private;
 258         char buf[12];
 259
 260         if (len > sizeof(buf) - 1)
 261                 return -EINVAL;
 262
 263         if (copy_from_user(buf, ubuf, len))
 264                 return -EFAULT;
 265
 266         buf[len] = '\0';
 267
 268         if (!strcmp(buf, "on"))
 269                 connector->force = DRM_FORCE_ON;
 270         else if (!strcmp(buf, "digital"))
 271                 connector->force = DRM_FORCE_ON_DIGITAL;
 272         else if (!strcmp(buf, "off"))
 273                 connector->force = DRM_FORCE_OFF;
 274         else if (!strcmp(buf, "unspecified"))
 275                 connector->force = DRM_FORCE_UNSPECIFIED;
 276         else
 277                 return -EINVAL;
 278
 279         return len;
 280 }
 281
 282 static int edid_show(struct seq_file *m, void *data)
 283 {
 284         struct drm_connector *connector = m->private;
 285         struct drm_property_blob *edid = connector->edid_blob_ptr;
 286
 287         if (connector->override_edid && edid)
 288                 seq_write(m, edid->data, edid->length);
 289
 290         return 0;
 291 }
 292
 293 static int edid_open(struct inode *inode, struct file *file)
 294 {
 295         struct drm_connector *dev = inode->i_private;
 296
 297         return single_open(file, edid_show, dev);
 298 }
 299
 300 static ssize_t edid_write(struct file *file, const char __user *ubuf,
 301                           size_t len, loff_t *offp)
 302 {
 303         struct seq_file *m = file->private_data;
 304         struct drm_connector *connector = m->private;
 305         char *buf;
 306         struct edid *edid;
 307         int ret;
 308
 309         buf = memdup_user(ubuf, len);
 310         if (IS_ERR(buf))
 311                 return PTR_ERR(buf);
 312
 313         edid = (struct edid *) buf;
 314
 315         if (len == 5 && !strncmp(buf, "reset", 5)) {
 316                 connector->override_edid = false;
 317                 ret = drm_connector_update_edid_property(connector, NULL);
 318         } else if (len < EDID_LENGTH ||
 319                    EDID_LENGTH * (1 + edid->extensions) > len)
 320                 ret = -EINVAL;
 321         else {
 322                 connector->override_edid = false;
 323                 ret = drm_connector_update_edid_property(connector, edid);
 324                 if (!ret)
 325                         connector->override_edid = true;
 326         }
 327
 328         kfree(buf);
 329
 330         return (ret) ? ret : len;
 331 }
 332
 333 static const struct file_operations drm_edid_fops = {
 334         .owner = THIS_MODULE,
 335         .open = edid_open,
 336         .read = seq_read,
 337         .llseek = seq_lseek,
 338         .release = single_release,
 339         .write = edid_write
 340 };
 341
 342
 343 static const struct file_operations drm_connector_fops = {
 344         .owner = THIS_MODULE,
 345         .open = connector_open,
 346         .read = seq_read,
 347         .llseek = seq_lseek,
 348         .release = single_release,
 349         .write = connector_write
 350 };
 351
 352 int drm_debugfs_connector_add(struct drm_connector *connector)
 353 {
 354         struct drm_minor *minor = connector->dev->primary;
 355         struct dentry *root, *ent;
 356
 357         if (!minor->debugfs_root)
 358                 return -1;
 359
 360         root = debugfs_create_dir(connector->name, minor->debugfs_root);
 361         if (!root)
 362                 return -ENOMEM;
 363
 364         connector->debugfs_entry = root;
 365
 366         /* force */
 367         ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
 368                                   &drm_connector_fops);
 369         if (!ent)
 370                 goto error;
 371
 372         /* edid */
 373         ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
 374                                   connector, &drm_edid_fops);
 375         if (!ent)
 376                 goto error;
 377
 378         return 0;
 379
 380 error:
 381         debugfs_remove_recursive(connector->debugfs_entry);
 382         connector->debugfs_entry = NULL;
 383         return -ENOMEM;
 384 }
 385
 386 void drm_debugfs_connector_remove(struct drm_connector *connector)
 387 {
 388         if (!connector->debugfs_entry)
 389                 return;
 390
 391         debugfs_remove_recursive(connector->debugfs_entry);
 392
 393         connector->debugfs_entry = NULL;
 394 }
 395
 396 int drm_debugfs_crtc_add(struct drm_crtc *crtc)
 397 {
 398         struct drm_minor *minor = crtc->dev->primary;
 399         struct dentry *root;
 400         char *name;
 401
 402         name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
 403         if (!name)
 404                 return -ENOMEM;
 405
 406         root = debugfs_create_dir(name, minor->debugfs_root);
 407         kfree(name);
 408         if (!root)
 409                 return -ENOMEM;
 410
 411         crtc->debugfs_entry = root;
 412
 413         if (drm_debugfs_crtc_crc_add(crtc))
 414                 goto error;
 415
 416         return 0;
 417
 418 error:
 419         drm_debugfs_crtc_remove(crtc);
 420         return -ENOMEM;
 421 }
 422
 423 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
 424 {
 425         debugfs_remove_recursive(crtc->debugfs_entry);
 426         crtc->debugfs_entry = NULL;
 427 }
 428
 429 #endif /* CONFIG_DEBUG_FS */