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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 | #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(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 | char name[64]; | |
94 | int i, ret; | |
95 | ||
96 | for (i = 0; i < count; i++) { | |
97 | u32 features = files[i].driver_features; | |
98 | ||
99 | if (features != 0 && | |
100 | (dev->driver->driver_features & features) != features) | |
101 | continue; | |
102 | ||
103 | tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL); | |
104 | if (tmp == NULL) { | |
105 | ret = -1; | |
106 | goto fail; | |
107 | } | |
108 | ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO, | |
109 | root, tmp, &drm_debugfs_fops); | |
110 | if (!ent) { | |
111 | DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n", | |
112 | name, files[i].name); | |
113 | kfree(tmp); | |
114 | ret = -1; | |
115 | goto fail; | |
116 | } | |
117 | ||
118 | tmp->minor = minor; | |
119 | tmp->dent = ent; | |
120 | tmp->info_ent = &files[i]; | |
121 | list_add(&(tmp->list), &(minor->debugfs_nodes.list)); | |
122 | } | |
123 | return 0; | |
124 | ||
125 | fail: | |
126 | drm_debugfs_remove_files(files, count, minor); | |
127 | return ret; | |
128 | } | |
129 | EXPORT_SYMBOL(drm_debugfs_create_files); | |
130 | ||
131 | /** | |
132 | * Initialize the DRI debugfs filesystem for a device | |
133 | * | |
134 | * \param dev DRM device | |
135 | * \param minor device minor number | |
136 | * \param root DRI debugfs dir entry. | |
137 | * | |
138 | * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry | |
139 | * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as | |
140 | * "/sys/kernel/debug/dri/%minor%/%name%". | |
141 | */ | |
142 | int drm_debugfs_init(struct drm_minor *minor, int minor_id, | |
143 | struct dentry *root) | |
144 | { | |
145 | struct drm_device *dev = minor->dev; | |
146 | char name[64]; | |
147 | int ret; | |
148 | ||
149 | INIT_LIST_HEAD(&minor->debugfs_nodes.list); | |
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(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 | for (i = 0; i < count; i++) { | |
196 | list_for_each_safe(pos, q, &minor->debugfs_nodes.list) { | |
197 | tmp = list_entry(pos, struct drm_info_node, list); | |
198 | if (tmp->info_ent == &files[i]) { | |
199 | debugfs_remove(tmp->dent); | |
200 | list_del(pos); | |
201 | kfree(tmp); | |
202 | } | |
203 | } | |
204 | } | |
205 | return 0; | |
206 | } | |
207 | EXPORT_SYMBOL(drm_debugfs_remove_files); | |
208 | ||
209 | /** | |
210 | * Cleanup the debugfs filesystem resources. | |
211 | * | |
212 | * \param minor device minor number. | |
213 | * \return always zero. | |
214 | * | |
215 | * Remove all debugfs entries created by debugfs_init(). | |
216 | */ | |
217 | int drm_debugfs_cleanup(struct drm_minor *minor) | |
218 | { | |
219 | struct drm_device *dev = minor->dev; | |
220 | ||
221 | if (!minor->debugfs_root) | |
222 | return 0; | |
223 | ||
224 | if (dev->driver->debugfs_cleanup) | |
225 | dev->driver->debugfs_cleanup(minor); | |
226 | ||
227 | drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor); | |
228 | ||
229 | debugfs_remove(minor->debugfs_root); | |
230 | minor->debugfs_root = NULL; | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | #endif /* CONFIG_DEBUG_FS */ | |
236 |