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 (dev->driver->debugfs_init) {
 162                 ret = dev->driver->debugfs_init(minor);
 163                 if (ret) {
 164                         DRM_ERROR("DRM: Driver failed to initialize "
 165                                   "/sys/kernel/debug/dri.\n");
 166                         return ret;
 167                 }
 168         }
 169         return 0;
 170 }
 171
 172
 173 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
 174                              struct drm_minor *minor)
 175 {
 176         struct list_head *pos, *q;
 177         struct drm_info_node *tmp;
 178         int i;
 179
 180         mutex_lock(&minor->debugfs_lock);
 181         for (i = 0; i < count; i++) {
 182                 list_for_each_safe(pos, q, &minor->debugfs_list) {
 183                         tmp = list_entry(pos, struct drm_info_node, list);
 184                         if (tmp->info_ent == &files[i]) {
 185                                 debugfs_remove(tmp->dent);
 186                                 list_del(pos);
 187                                 kfree(tmp);
 188                         }
 189                 }
 190         }
 191         mutex_unlock(&minor->debugfs_lock);
 192         return 0;
 193 }
 194 EXPORT_SYMBOL(drm_debugfs_remove_files);
 195
 196 static void drm_debugfs_remove_all_files(struct drm_minor *minor)
 197 {
 198         struct drm_info_node *node, *tmp;
 199
 200         mutex_lock(&minor->debugfs_lock);
 201         list_for_each_entry_safe(node, tmp, &minor->debugfs_list, list) {
 202                 debugfs_remove(node->dent);
 203                 list_del(&node->list);
 204                 kfree(node);
 205         }
 206         mutex_unlock(&minor->debugfs_lock);
 207 }
 208
 209 int drm_debugfs_cleanup(struct drm_minor *minor)
 210 {
 211         if (!minor->debugfs_root)
 212                 return 0;
 213
 214         drm_debugfs_remove_all_files(minor);
 215
 216         debugfs_remove_recursive(minor->debugfs_root);
 217         minor->debugfs_root = NULL;
 218
 219         return 0;
 220 }
 221
 222 static int connector_show(struct seq_file *m, void *data)
 223 {
 224         struct drm_connector *connector = m->private;
 225
 226         seq_printf(m, "%s\n", drm_get_connector_force_name(connector->force));
 227
 228         return 0;
 229 }
 230
 231 static int connector_open(struct inode *inode, struct file *file)
 232 {
 233         struct drm_connector *dev = inode->i_private;
 234
 235         return single_open(file, connector_show, dev);
 236 }
 237
 238 static ssize_t connector_write(struct file *file, const char __user *ubuf,
 239                                size_t len, loff_t *offp)
 240 {
 241         struct seq_file *m = file->private_data;
 242         struct drm_connector *connector = m->private;
 243         char buf[12];
 244
 245         if (len > sizeof(buf) - 1)
 246                 return -EINVAL;
 247
 248         if (copy_from_user(buf, ubuf, len))
 249                 return -EFAULT;
 250
 251         buf[len] = '\0';
 252
 253         if (!strcmp(buf, "on"))
 254                 connector->force = DRM_FORCE_ON;
 255         else if (!strcmp(buf, "digital"))
 256                 connector->force = DRM_FORCE_ON_DIGITAL;
 257         else if (!strcmp(buf, "off"))
 258                 connector->force = DRM_FORCE_OFF;
 259         else if (!strcmp(buf, "unspecified"))
 260                 connector->force = DRM_FORCE_UNSPECIFIED;
 261         else
 262                 return -EINVAL;
 263
 264         return len;
 265 }
 266
 267 static int edid_show(struct seq_file *m, void *data)
 268 {
 269         struct drm_connector *connector = m->private;
 270         struct drm_property_blob *edid = connector->edid_blob_ptr;
 271
 272         if (connector->override_edid && edid)
 273                 seq_write(m, edid->data, edid->length);
 274
 275         return 0;
 276 }
 277
 278 static int edid_open(struct inode *inode, struct file *file)
 279 {
 280         struct drm_connector *dev = inode->i_private;
 281
 282         return single_open(file, edid_show, dev);
 283 }
 284
 285 static ssize_t edid_write(struct file *file, const char __user *ubuf,
 286                           size_t len, loff_t *offp)
 287 {
 288         struct seq_file *m = file->private_data;
 289         struct drm_connector *connector = m->private;
 290         char *buf;
 291         struct edid *edid;
 292         int ret;
 293
 294         buf = memdup_user(ubuf, len);
 295         if (IS_ERR(buf))
 296                 return PTR_ERR(buf);
 297
 298         edid = (struct edid *) buf;
 299
 300         if (len == 5 && !strncmp(buf, "reset", 5)) {
 301                 connector->override_edid = false;
 302                 ret = drm_mode_connector_update_edid_property(connector, NULL);
 303         } else if (len < EDID_LENGTH ||
 304                    EDID_LENGTH * (1 + edid->extensions) > len)
 305                 ret = -EINVAL;
 306         else {
 307                 connector->override_edid = false;
 308                 ret = drm_mode_connector_update_edid_property(connector, edid);
 309                 if (!ret)
 310                         connector->override_edid = true;
 311         }
 312
 313         kfree(buf);
 314
 315         return (ret) ? ret : len;
 316 }
 317
 318 static const struct file_operations drm_edid_fops = {
 319         .owner = THIS_MODULE,
 320         .open = edid_open,
 321         .read = seq_read,
 322         .llseek = seq_lseek,
 323         .release = single_release,
 324         .write = edid_write
 325 };
 326
 327
 328 static const struct file_operations drm_connector_fops = {
 329         .owner = THIS_MODULE,
 330         .open = connector_open,
 331         .read = seq_read,
 332         .llseek = seq_lseek,
 333         .release = single_release,
 334         .write = connector_write
 335 };
 336
 337 int drm_debugfs_connector_add(struct drm_connector *connector)
 338 {
 339         struct drm_minor *minor = connector->dev->primary;
 340         struct dentry *root, *ent;
 341
 342         if (!minor->debugfs_root)
 343                 return -1;
 344
 345         root = debugfs_create_dir(connector->name, minor->debugfs_root);
 346         if (!root)
 347                 return -ENOMEM;
 348
 349         connector->debugfs_entry = root;
 350
 351         /* force */
 352         ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
 353                                   &drm_connector_fops);
 354         if (!ent)
 355                 goto error;
 356
 357         /* edid */
 358         ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
 359                                   connector, &drm_edid_fops);
 360         if (!ent)
 361                 goto error;
 362
 363         return 0;
 364
 365 error:
 366         debugfs_remove_recursive(connector->debugfs_entry);
 367         connector->debugfs_entry = NULL;
 368         return -ENOMEM;
 369 }
 370
 371 void drm_debugfs_connector_remove(struct drm_connector *connector)
 372 {
 373         if (!connector->debugfs_entry)
 374                 return;
 375
 376         debugfs_remove_recursive(connector->debugfs_entry);
 377
 378         connector->debugfs_entry = NULL;
 379 }
 380
 381 int drm_debugfs_crtc_add(struct drm_crtc *crtc)
 382 {
 383         struct drm_minor *minor = crtc->dev->primary;
 384         struct dentry *root;
 385         char *name;
 386
 387         name = kasprintf(GFP_KERNEL, "crtc-%d", crtc->index);
 388         if (!name)
 389                 return -ENOMEM;
 390
 391         root = debugfs_create_dir(name, minor->debugfs_root);
 392         kfree(name);
 393         if (!root)
 394                 return -ENOMEM;
 395
 396         crtc->debugfs_entry = root;
 397
 398         if (drm_debugfs_crtc_crc_add(crtc))
 399                 goto error;
 400
 401         return 0;
 402
 403 error:
 404         drm_debugfs_crtc_remove(crtc);
 405         return -ENOMEM;
 406 }
 407
 408 void drm_debugfs_crtc_remove(struct drm_crtc *crtc)
 409 {
 410         debugfs_remove_recursive(crtc->debugfs_entry);
 411         crtc->debugfs_entry = NULL;
 412 }
 413
 414 #endif /* CONFIG_DEBUG_FS */