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28a62277 BG |
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> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
2d1a8a48 | 36 | #include <linux/export.h> |
28a62277 BG |
37 | #include "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 | {"queues", drm_queues_info, 0}, | |
50 | {"bufs", drm_bufs_info, 0}, | |
51 | {"gem_names", drm_gem_name_info, DRIVER_GEM}, | |
28a62277 BG |
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; | |
28a62277 BG |
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 | ||
9a298b2a | 103 | tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL); |
d25e3a6f JS |
104 | if (tmp == NULL) { |
105 | ret = -1; | |
106 | goto fail; | |
107 | } | |
28a62277 BG |
108 | ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO, |
109 | root, tmp, &drm_debugfs_fops); | |
110 | if (!ent) { | |
156f5a78 | 111 | DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n", |
bd8315c4 | 112 | root->d_name.name, files[i].name); |
9a298b2a | 113 | kfree(tmp); |
28a62277 BG |
114 | ret = -1; |
115 | goto fail; | |
116 | } | |
117 | ||
118 | tmp->minor = minor; | |
119 | tmp->dent = ent; | |
120 | tmp->info_ent = &files[i]; | |
b3e067c0 MS |
121 | |
122 | mutex_lock(&minor->debugfs_lock); | |
123 | list_add(&tmp->list, &minor->debugfs_list); | |
124 | mutex_unlock(&minor->debugfs_lock); | |
28a62277 BG |
125 | } |
126 | return 0; | |
127 | ||
128 | fail: | |
129 | drm_debugfs_remove_files(files, count, minor); | |
130 | return ret; | |
131 | } | |
132 | EXPORT_SYMBOL(drm_debugfs_create_files); | |
133 | ||
134 | /** | |
135 | * Initialize the DRI debugfs filesystem for a device | |
136 | * | |
137 | * \param dev DRM device | |
138 | * \param minor device minor number | |
139 | * \param root DRI debugfs dir entry. | |
140 | * | |
156f5a78 GL |
141 | * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry |
142 | * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as | |
143 | * "/sys/kernel/debug/dri/%minor%/%name%". | |
28a62277 BG |
144 | */ |
145 | int drm_debugfs_init(struct drm_minor *minor, int minor_id, | |
146 | struct dentry *root) | |
147 | { | |
148 | struct drm_device *dev = minor->dev; | |
149 | char name[64]; | |
150 | int ret; | |
151 | ||
b3e067c0 MS |
152 | INIT_LIST_HEAD(&minor->debugfs_list); |
153 | mutex_init(&minor->debugfs_lock); | |
28a62277 BG |
154 | sprintf(name, "%d", minor_id); |
155 | minor->debugfs_root = debugfs_create_dir(name, root); | |
156 | if (!minor->debugfs_root) { | |
156f5a78 | 157 | DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name); |
28a62277 BG |
158 | return -1; |
159 | } | |
160 | ||
161 | ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, | |
162 | minor->debugfs_root, minor); | |
163 | if (ret) { | |
164 | debugfs_remove(minor->debugfs_root); | |
165 | minor->debugfs_root = NULL; | |
166 | DRM_ERROR("Failed to create core drm debugfs files\n"); | |
167 | return ret; | |
168 | } | |
169 | ||
170 | if (dev->driver->debugfs_init) { | |
171 | ret = dev->driver->debugfs_init(minor); | |
172 | if (ret) { | |
173 | DRM_ERROR("DRM: Driver failed to initialize " | |
156f5a78 | 174 | "/sys/kernel/debug/dri.\n"); |
28a62277 BG |
175 | return ret; |
176 | } | |
177 | } | |
178 | return 0; | |
179 | } | |
180 | ||
181 | ||
182 | /** | |
183 | * Remove a list of debugfs files | |
184 | * | |
185 | * \param files The list of files | |
186 | * \param count The number of files | |
187 | * \param minor The minor of which we should remove the files | |
188 | * \return always zero. | |
189 | * | |
190 | * Remove all debugfs entries created by debugfs_init(). | |
191 | */ | |
192 | int drm_debugfs_remove_files(struct drm_info_list *files, int count, | |
193 | struct drm_minor *minor) | |
194 | { | |
195 | struct list_head *pos, *q; | |
196 | struct drm_info_node *tmp; | |
197 | int i; | |
198 | ||
b3e067c0 | 199 | mutex_lock(&minor->debugfs_lock); |
28a62277 | 200 | for (i = 0; i < count; i++) { |
b3e067c0 | 201 | list_for_each_safe(pos, q, &minor->debugfs_list) { |
28a62277 BG |
202 | tmp = list_entry(pos, struct drm_info_node, list); |
203 | if (tmp->info_ent == &files[i]) { | |
204 | debugfs_remove(tmp->dent); | |
205 | list_del(pos); | |
9a298b2a | 206 | kfree(tmp); |
28a62277 BG |
207 | } |
208 | } | |
209 | } | |
b3e067c0 | 210 | mutex_unlock(&minor->debugfs_lock); |
28a62277 BG |
211 | return 0; |
212 | } | |
213 | EXPORT_SYMBOL(drm_debugfs_remove_files); | |
214 | ||
215 | /** | |
216 | * Cleanup the debugfs filesystem resources. | |
217 | * | |
218 | * \param minor device minor number. | |
219 | * \return always zero. | |
220 | * | |
221 | * Remove all debugfs entries created by debugfs_init(). | |
222 | */ | |
223 | int drm_debugfs_cleanup(struct drm_minor *minor) | |
224 | { | |
225 | struct drm_device *dev = minor->dev; | |
226 | ||
227 | if (!minor->debugfs_root) | |
228 | return 0; | |
229 | ||
230 | if (dev->driver->debugfs_cleanup) | |
231 | dev->driver->debugfs_cleanup(minor); | |
232 | ||
233 | drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor); | |
234 | ||
235 | debugfs_remove(minor->debugfs_root); | |
236 | minor->debugfs_root = NULL; | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | #endif /* CONFIG_DEBUG_FS */ | |
242 |