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drm_debugfs.c
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1 
8 /*
9  * Created: Sun Dec 21 13:08:50 2008 by [email protected]
10  *
11  * Copyright 2008 Ben Gamari <[email protected]>
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 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 
87 int drm_debugfs_create_files(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 
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 
191 int drm_debugfs_remove_files(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 
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