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
  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         {"vm", drm_vm_info, 0},
  48         {"clients", drm_clients_info, 0},
  49         {"bufs", drm_bufs_info, 0},
  50         {"gem_names", drm_gem_name_info, DRIVER_GEM},
  51 #if DRM_DEBUG_CODE
  52         {"vma", drm_vma_info, 0},
  53 #endif
  54 };
  55 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
  56
  57
  58 static int drm_debugfs_open(struct inode *inode, struct file *file)
  59 {
  60         struct drm_info_node *node = inode->i_private;
  61
  62         return single_open(file, node->info_ent->show, node);
  63 }
  64
  65
  66 static const struct file_operations drm_debugfs_fops = {
  67         .owner = THIS_MODULE,
  68         .open = drm_debugfs_open,
  69         .read = seq_read,
  70         .llseek = seq_lseek,
  71         .release = single_release,
  72 };
  73
  74
  75 /**
  76  * Initialize a given set of debugfs files for a device
  77  *
  78  * \param files The array of files to create
  79  * \param count The number of files given
  80  * \param root DRI debugfs dir entry.
  81  * \param minor device minor number
  82  * \return Zero on success, non-zero on failure
  83  *
  84  * Create a given set of debugfs files represented by an array of
  85  * gdm_debugfs_lists in the given root directory.
  86  */
  87 int drm_debugfs_create_files(const struct drm_info_list *files, int count,
  88                              struct dentry *root, struct drm_minor *minor)
  89 {
  90         struct drm_device *dev = minor->dev;
  91         struct dentry *ent;
  92         struct drm_info_node *tmp;
  93         int i, ret;
  94
  95         for (i = 0; i < count; i++) {
  96                 u32 features = files[i].driver_features;
  97
  98                 if (features != 0 &&
  99                     (dev->driver->driver_features & features) != features)
 100                         continue;
 101
 102                 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
 103                 if (tmp == NULL) {
 104                         ret = -1;
 105                         goto fail;
 106                 }
 107                 ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
 108                                           root, tmp, &drm_debugfs_fops);
 109                 if (!ent) {
 110                         DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n",
 111                                   root->d_name.name, files[i].name);
 112                         kfree(tmp);
 113                         ret = -1;
 114                         goto fail;
 115                 }
 116
 117                 tmp->minor = minor;
 118                 tmp->dent = ent;
 119                 tmp->info_ent = &files[i];
 120
 121                 mutex_lock(&minor->debugfs_lock);
 122                 list_add(&tmp->list, &minor->debugfs_list);
 123                 mutex_unlock(&minor->debugfs_lock);
 124         }
 125         return 0;
 126
 127 fail:
 128         drm_debugfs_remove_files(files, count, minor);
 129         return ret;
 130 }
 131 EXPORT_SYMBOL(drm_debugfs_create_files);
 132
 133 /**
 134  * Initialize the DRI debugfs filesystem for a device
 135  *
 136  * \param dev DRM device
 137  * \param minor device minor number
 138  * \param root DRI debugfs dir entry.
 139  *
 140  * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry
 141  * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as
 142  * "/sys/kernel/debug/dri/%minor%/%name%".
 143  */
 144 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
 145                      struct dentry *root)
 146 {
 147         struct drm_device *dev = minor->dev;
 148         char name[64];
 149         int ret;
 150
 151         INIT_LIST_HEAD(&minor->debugfs_list);
 152         mutex_init(&minor->debugfs_lock);
 153         sprintf(name, "%d", minor_id);
 154         minor->debugfs_root = debugfs_create_dir(name, root);
 155         if (!minor->debugfs_root) {
 156                 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
 157                 return -1;
 158         }
 159
 160         ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
 161                                        minor->debugfs_root, minor);
 162         if (ret) {
 163                 debugfs_remove(minor->debugfs_root);
 164                 minor->debugfs_root = NULL;
 165                 DRM_ERROR("Failed to create core drm debugfs files\n");
 166                 return ret;
 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 /**
 182  * Remove a list of debugfs files
 183  *
 184  * \param files The list of files
 185  * \param count The number of files
 186  * \param minor The minor of which we should remove the files
 187  * \return always zero.
 188  *
 189  * Remove all debugfs entries created by debugfs_init().
 190  */
 191 int drm_debugfs_remove_files(const struct drm_info_list *files, int count,
 192                              struct drm_minor *minor)
 193 {
 194         struct list_head *pos, *q;
 195         struct drm_info_node *tmp;
 196         int i;
 197
 198         mutex_lock(&minor->debugfs_lock);
 199         for (i = 0; i < count; i++) {
 200                 list_for_each_safe(pos, q, &minor->debugfs_list) {
 201                         tmp = list_entry(pos, struct drm_info_node, list);
 202                         if (tmp->info_ent == &files[i]) {
 203                                 debugfs_remove(tmp->dent);
 204                                 list_del(pos);
 205                                 kfree(tmp);
 206                         }
 207                 }
 208         }
 209         mutex_unlock(&minor->debugfs_lock);
 210         return 0;
 211 }
 212 EXPORT_SYMBOL(drm_debugfs_remove_files);
 213
 214 /**
 215  * Cleanup the debugfs filesystem resources.
 216  *
 217  * \param minor device minor number.
 218  * \return always zero.
 219  *
 220  * Remove all debugfs entries created by debugfs_init().
 221  */
 222 int drm_debugfs_cleanup(struct drm_minor *minor)
 223 {
 224         struct drm_device *dev = minor->dev;
 225
 226         if (!minor->debugfs_root)
 227                 return 0;
 228
 229         if (dev->driver->debugfs_cleanup)
 230                 dev->driver->debugfs_cleanup(minor);
 231
 232         drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
 233
 234         debugfs_remove(minor->debugfs_root);
 235         minor->debugfs_root = NULL;
 236
 237         return 0;
 238 }
 239
 240 #endif /* CONFIG_DEBUG_FS */
 241