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 "drmP.h"
  37
  38 #if defined(CONFIG_DEBUG_FS)
  39
  40 /***************************************************
  41  * Initialization, etc.
  42  **************************************************/
  43
  44 static struct drm_info_list drm_debugfs_list[] = {
  45         {"name", drm_name_info, 0},
  46         {"vm", drm_vm_info, 0},
  47         {"clients", drm_clients_info, 0},
  48         {"queues", drm_queues_info, 0},
  49         {"bufs", drm_bufs_info, 0},
  50         {"gem_names", drm_gem_name_info, DRIVER_GEM},
  51         {"gem_objects", drm_gem_object_info, DRIVER_GEM},
  52 #if DRM_DEBUG_CODE
  53         {"vma", drm_vma_info, 0},
  54 #endif
  55 };
  56 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
  57
  58
  59 static int drm_debugfs_open(struct inode *inode, struct file *file)
  60 {
  61         struct drm_info_node *node = inode->i_private;
  62
  63         return single_open(file, node->info_ent->show, node);
  64 }
  65
  66
  67 static const struct file_operations drm_debugfs_fops = {
  68         .owner = THIS_MODULE,
  69         .open = drm_debugfs_open,
  70         .read = seq_read,
  71         .llseek = seq_lseek,
  72         .release = single_release,
  73 };
  74
  75
  76 /**
  77  * Initialize a given set of debugfs files for a device
  78  *
  79  * \param files The array of files to create
  80  * \param count The number of files given
  81  * \param root DRI debugfs dir entry.
  82  * \param minor device minor number
  83  * \return Zero on success, non-zero on failure
  84  *
  85  * Create a given set of debugfs files represented by an array of
  86  * gdm_debugfs_lists in the given root directory.
  87  */
  88 int drm_debugfs_create_files(struct drm_info_list *files, int count,
  89                              struct dentry *root, struct drm_minor *minor)
  90 {
  91         struct drm_device *dev = minor->dev;
  92         struct dentry *ent;
  93         struct drm_info_node *tmp;
  94         char name[64];
  95         int i, ret;
  96
  97         for (i = 0; i < count; i++) {
  98                 u32 features = files[i].driver_features;
  99
 100                 if (features != 0 &&
 101                     (dev->driver->driver_features & features) != features)
 102                         continue;
 103
 104                 tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
 105                 if (tmp == NULL) {
 106                         ret = -1;
 107                         goto fail;
 108                 }
 109                 ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,
 110                                           root, tmp, &drm_debugfs_fops);
 111                 if (!ent) {
 112                         DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n",
 113                                   name, files[i].name);
 114                         kfree(tmp);
 115                         ret = -1;
 116                         goto fail;
 117                 }
 118
 119                 tmp->minor = minor;
 120                 tmp->dent = ent;
 121                 tmp->info_ent = &files[i];
 122                 list_add(&(tmp->list), &(minor->debugfs_nodes.list));
 123         }
 124         return 0;
 125
 126 fail:
 127         drm_debugfs_remove_files(files, count, minor);
 128         return ret;
 129 }
 130 EXPORT_SYMBOL(drm_debugfs_create_files);
 131
 132 /**
 133  * Initialize the DRI debugfs filesystem for a device
 134  *
 135  * \param dev DRM device
 136  * \param minor device minor number
 137  * \param root DRI debugfs dir entry.
 138  *
 139  * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry
 140  * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as
 141  * "/sys/kernel/debug/dri/%minor%/%name%".
 142  */
 143 int drm_debugfs_init(struct drm_minor *minor, int minor_id,
 144                      struct dentry *root)
 145 {
 146         struct drm_device *dev = minor->dev;
 147         char name[64];
 148         int ret;
 149
 150         INIT_LIST_HEAD(&minor->debugfs_nodes.list);
 151         sprintf(name, "%d", minor_id);
 152         minor->debugfs_root = debugfs_create_dir(name, root);
 153         if (!minor->debugfs_root) {
 154                 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);
 155                 return -1;
 156         }
 157
 158         ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,
 159                                        minor->debugfs_root, minor);
 160         if (ret) {
 161                 debugfs_remove(minor->debugfs_root);
 162                 minor->debugfs_root = NULL;
 163                 DRM_ERROR("Failed to create core drm debugfs files\n");
 164                 return ret;
 165         }
 166
 167         if (dev->driver->debugfs_init) {
 168                 ret = dev->driver->debugfs_init(minor);
 169                 if (ret) {
 170                         DRM_ERROR("DRM: Driver failed to initialize "
 171                                   "/sys/kernel/debug/dri.\n");
 172                         return ret;
 173                 }
 174         }
 175         return 0;
 176 }
 177
 178
 179 /**
 180  * Remove a list of debugfs files
 181  *
 182  * \param files The list of files
 183  * \param count The number of files
 184  * \param minor The minor of which we should remove the files
 185  * \return always zero.
 186  *
 187  * Remove all debugfs entries created by debugfs_init().
 188  */
 189 int drm_debugfs_remove_files(struct drm_info_list *files, int count,
 190                              struct drm_minor *minor)
 191 {
 192         struct list_head *pos, *q;
 193         struct drm_info_node *tmp;
 194         int i;
 195
 196         for (i = 0; i < count; i++) {
 197                 list_for_each_safe(pos, q, &minor->debugfs_nodes.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         return 0;
 207 }
 208 EXPORT_SYMBOL(drm_debugfs_remove_files);
 209
 210 /**
 211  * Cleanup the debugfs filesystem resources.
 212  *
 213  * \param minor device minor number.
 214  * \return always zero.
 215  *
 216  * Remove all debugfs entries created by debugfs_init().
 217  */
 218 int drm_debugfs_cleanup(struct drm_minor *minor)
 219 {
 220         struct drm_device *dev = minor->dev;
 221
 222         if (!minor->debugfs_root)
 223                 return 0;
 224
 225         if (dev->driver->debugfs_cleanup)
 226                 dev->driver->debugfs_cleanup(minor);
 227
 228         drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor);
 229
 230         debugfs_remove(minor->debugfs_root);
 231         minor->debugfs_root = NULL;
 232
 233         return 0;
 234 }
 235
 236 #endif /* CONFIG_DEBUG_FS */
 237