drivers/gpu/drm/drm_debugfs.c

   1 /**
   2  * \file drm_debugfs.c
   3  * debugfs support for DRM
   4  *
   5  * \author Ben Gamari <bgamari@gmail.com>
   6  */
   7
   8 /*
   9  * Created: Sun Dec 21 13:08:50 2008 by bgamari@gmail.com
  10  *
  11  * Copyright 2008 Ben Gamari <bgamari@gmail.com>
  12  *
  13  * Permission is hereby granted, free of charge, to any person obtaining a
  14  * copy of this software and associated documentation files (the "Software"),
  15  * to deal in the Software without restriction, including without limitation
  16  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  17  * and/or sell copies of the Software, and to permit persons to whom the
  18  * Software is furnished to do so, subject to the following conditions:
  19  *
  20  * The above copyright notice and this permission notice (including the next
  21  * paragraph) shall be included in all copies or substantial portions of the
  22  * Software.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  27  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  28  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  29  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  30  * OTHER DEALINGS IN THE SOFTWARE.
  31  */
  32
  33 #include <linux/debugfs.h>
  34 #include <linux/seq_file.h>
  35 #include <linux/slab.h>
  36 #include <linux/export.h>
  37 #include <drm/drmP.h>
  38 #include <drm/drm_edid.h>
  39 #include "drm_internal.h"
  40
  41 #if defined(CONFIG_DEBUG_FS)
  42
  43 /***************************************************
  44  * Initialization, etc.
  45  **************************************************/
  46
  47 static const struct drm_info_list drm_debugfs_list[] = {
  48         {"name", drm_name_info, 0},
  49         {"clients", drm_clients_info, 0},
  50         {"gem_names", drm_gem_name_info, DRIVER_GEM},
  51 };
  52 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
  53
  54
  55 static int drm_debugfs_open(struct inode *inode, struct file *file)
  56 {
  57         struct drm_info_node *node = inode->i_private;
  58
  59         return single_open(file, node->info_ent->show, node);
  60 }
  61
  62
  63 static const struct file_operations drm_debugfs_fops = {
  64         .owner = THIS_MODULE,
  65         .open = drm_debugfs_open,
  66         .read = seq_read,
  67         .llseek = seq_lseek,
  68         .release = single_release,
  69 };
  70
  71
  72 /**
  73  * Initialize a given set of debugfs files for a device
  74  *
  75  * \param files The array of files to create
  76  * \param count The number of files given
  77  * \param root DRI debugfs dir entry.
  78  * \param minor device minor number
  79  * \return Zero on success, non-zero on failure
  80  *
  81  * Create a given set of debugfs files represented by an array of
  82  * gdm_debugfs_lists in the given root directory.
  83  */
  84 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
  85                              struct dentry *root, struct drm_minor *minor)
  86 {
  87         struct drm_device *dev = minor->dev;
  88         struct dentry *ent;
  89         struct drm_info_node *tmp;
  90         int i, ret;
  91
  92         for (i = 0; i < count; i++) {
  93                 u32 features = files[i].driver_features;
  94
  95                 if (features != 0 &&
  96                     (dev->driver->driver_features & features) != features)
  97                         continue;
  98
  99                 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
 100                 if (tmp == NULL) {
 101                         ret = -1;
 102                         goto fail;
 103                 }
 104                 ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
 105                                           root, tmp, &drm_debugfs_fops);
 106                 if (!ent) {
 107                         DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n",
 108                                   root->d_name.name, files[i].name);
 109                         kfree(tmp);
 110                         ret = -1;
 111                         goto fail;
 112                 }
 113
 114                 tmp->minor = minor;
 115                 tmp->dent = ent;
 116                 tmp->info_ent = &files[i];
 117
 118                 mutex_lock(&minor->debugfs_lock);
 119                 list_add(&tmp->list, &minor->debugfs_list);
 120                 mutex_unlock(&minor->debugfs_lock);
 121         }
 122         return 0;
 123
 124 fail:
 125         drm_debugfs_remove_files(files, count, minor);
 126         return ret;
 127 }
 128 EXPORT_SYMBOL(drm_debugfs_create_files);
 129
 130 /**
 131  * Initialize the DRI debugfs filesystem for a device
 132  *
 133  * \param dev DRM device
 134  * \param minor device minor number
 135  * \param root DRI debugfs dir entry.
 136  *
 137  * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry
 138  * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as
 139  * "/sys/kernel/debug/dri/%minor%/%name%".
 140  */
 141 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
 142                      struct dentry *root)
 143 {
 144         struct drm_device *dev = minor->dev;
 145         char name[64];
 146         int ret;
 147
 148         INIT_LIST_HEAD(&minor->debugfs_list);
 149         mutex_init(&minor->debugfs_lock);
 150         sprintf(name, "%d", minor_id);
 151         minor->debugfs_root = debugfs_create_dir(name, root);
 152         if (!minor->debugfs_root) {
 153                 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
 154                 return -1;
 155         }
 156
 157         ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
 158                                        minor->debugfs_root, minor);
 159         if (ret) {
 160                 debugfs_remove(minor->debugfs_root);
 161                 minor->debugfs_root = NULL;
 162                 DRM_ERROR("Failed to create core drm debugfs files\n");
 163                 return ret;
 164         }
 165
 166         if (dev->driver->debugfs_init) {
 167                 ret = dev->driver->debugfs_init(minor);
 168                 if (ret) {
 169                         DRM_ERROR("DRM: Driver failed to initialize "
 170                                   "/sys/kernel/debug/dri.\n");
 171                         return ret;
 172                 }
 173         }
 174         return 0;
 175 }
 176
 177
 178 /**
 179  * Remove a list of debugfs files
 180  *
 181  * \param files The list of files
 182  * \param count The number of files
 183  * \param minor The minor of which we should remove the files
 184  * \return always zero.
 185  *
 186  * Remove all debugfs entries created by debugfs_init().
 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 /**
 212  * Cleanup the debugfs filesystem resources.
 213  *
 214  * \param minor device minor number.
 215  * \return always zero.
 216  *
 217  * Remove all debugfs entries created by debugfs_init().
 218  */
 219 int drm_debugfs_cleanup(struct drm_minor *minor)
 220 {
 221         struct drm_device *dev = minor->dev;
 222
 223         if (!minor->debugfs_root)
 224                 return 0;
 225
 226         if (dev->driver->debugfs_cleanup)
 227                 dev->driver->debugfs_cleanup(minor);
 228
 229         drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
 230
 231         debugfs_remove(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         const char *status;
 241
 242         switch (connector->force) {
 243         case DRM_FORCE_ON:
 244                 status = "on\n";
 245                 break;
 246
 247         case DRM_FORCE_ON_DIGITAL:
 248                 status = "digital\n";
 249                 break;
 250
 251         case DRM_FORCE_OFF:
 252                 status = "off\n";
 253                 break;
 254
 255         case DRM_FORCE_UNSPECIFIED:
 256                 status = "unspecified\n";
 257                 break;
 258
 259         default:
 260                 return 0;
 261         }
 262
 263         seq_puts(m, status);
 264
 265         return 0;
 266 }
 267
 268 static int connector_open(struct inode *inode, struct file *file)
 269 {
 270         struct drm_connector *dev = inode->i_private;
 271
 272         return single_open(file, connector_show, dev);
 273 }
 274
 275 static ssize_t connector_write(struct file *file, const char __user *ubuf,
 276                                size_t len, loff_t *offp)
 277 {
 278         struct seq_file *m = file->private_data;
 279         struct drm_connector *connector = m->private;
 280         char buf[12];
 281
 282         if (len > sizeof(buf) - 1)
 283                 return -EINVAL;
 284
 285         if (copy_from_user(buf, ubuf, len))
 286                 return -EFAULT;
 287
 288         buf[len] = '\0';
 289
 290         if (!strcmp(buf, "on"))
 291                 connector->force = DRM_FORCE_ON;
 292         else if (!strcmp(buf, "digital"))
 293                 connector->force = DRM_FORCE_ON_DIGITAL;
 294         else if (!strcmp(buf, "off"))
 295                 connector->force = DRM_FORCE_OFF;
 296         else if (!strcmp(buf, "unspecified"))
 297                 connector->force = DRM_FORCE_UNSPECIFIED;
 298         else
 299                 return -EINVAL;
 300
 301         return len;
 302 }
 303
 304 static int edid_show(struct seq_file *m, void *data)
 305 {
 306         struct drm_connector *connector = m->private;
 307         struct drm_property_blob *edid = connector->edid_blob_ptr;
 308
 309         if (connector->override_edid && edid)
 310                 seq_write(m, edid->data, edid->length);
 311
 312         return 0;
 313 }
 314
 315 static int edid_open(struct inode *inode, struct file *file)
 316 {
 317         struct drm_connector *dev = inode->i_private;
 318
 319         return single_open(file, edid_show, dev);
 320 }
 321
 322 static ssize_t edid_write(struct file *file, const char __user *ubuf,
 323                           size_t len, loff_t *offp)
 324 {
 325         struct seq_file *m = file->private_data;
 326         struct drm_connector *connector = m->private;
 327         char *buf;
 328         struct edid *edid;
 329         int ret;
 330
 331         buf = memdup_user(ubuf, len);
 332         if (IS_ERR(buf))
 333                 return PTR_ERR(buf);
 334
 335         edid = (struct edid *) buf;
 336
 337         if (len == 5 && !strncmp(buf, "reset", 5)) {
 338                 connector->override_edid = false;
 339                 ret = drm_mode_connector_update_edid_property(connector, NULL);
 340         } else if (len < EDID_LENGTH ||
 341                    EDID_LENGTH * (1 + edid->extensions) > len)
 342                 ret = -EINVAL;
 343         else {
 344                 connector->override_edid = false;
 345                 ret = drm_mode_connector_update_edid_property(connector, edid);
 346                 if (!ret)
 347                         connector->override_edid = true;
 348         }
 349
 350         kfree(buf);
 351
 352         return (ret) ? ret : len;
 353 }
 354
 355 static const struct file_operations drm_edid_fops = {
 356         .owner = THIS_MODULE,
 357         .open = edid_open,
 358         .read = seq_read,
 359         .llseek = seq_lseek,
 360         .release = single_release,
 361         .write = edid_write
 362 };
 363
 364
 365 static const struct file_operations drm_connector_fops = {
 366         .owner = THIS_MODULE,
 367         .open = connector_open,
 368         .read = seq_read,
 369         .llseek = seq_lseek,
 370         .release = single_release,
 371         .write = connector_write
 372 };
 373
 374 int drm_debugfs_connector_add(struct drm_connector *connector)
 375 {
 376         struct drm_minor *minor = connector->dev->primary;
 377         struct dentry *root, *ent;
 378
 379         if (!minor->debugfs_root)
 380                 return -1;
 381
 382         root = debugfs_create_dir(connector->name, minor->debugfs_root);
 383         if (!root)
 384                 return -ENOMEM;
 385
 386         connector->debugfs_entry = root;
 387
 388         /* force */
 389         ent = debugfs_create_file("force", S_IRUGO | S_IWUSR, root, connector,
 390                                   &drm_connector_fops);
 391         if (!ent)
 392                 goto error;
 393
 394         /* edid */
 395         ent = debugfs_create_file("edid_override", S_IRUGO | S_IWUSR, root,
 396                                   connector, &drm_edid_fops);
 397         if (!ent)
 398                 goto error;
 399
 400         return 0;
 401
 402 error:
 403         debugfs_remove_recursive(connector->debugfs_entry);
 404         connector->debugfs_entry = NULL;
 405         return -ENOMEM;
 406 }
 407
 408 void drm_debugfs_connector_remove(struct drm_connector *connector)
 409 {
 410         if (!connector->debugfs_entry)
 411                 return;
 412
 413         debugfs_remove_recursive(connector->debugfs_entry);
 414
 415         connector->debugfs_entry = NULL;
 416 }
 417
 418 #endif /* CONFIG_DEBUG_FS */
 419