3 * debugfs support for DRM
5 * \author Ben Gamari <bgamari@gmail.com>
9 * Created: Sun Dec 21 13:08:50 2008 by bgamari@gmail.com
11 * Copyright 2008 Ben Gamari <bgamari@gmail.com>
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:
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
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.
33 #include <linux/debugfs.h>
34 #include <linux/seq_file.h>
35 #include <linux/slab.h>
36 #include <linux/export.h>
39 #if defined(CONFIG_DEBUG_FS)
41 /***************************************************
42 * Initialization, etc.
43 **************************************************/
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
},
52 {"vma", drm_vma_info
, 0},
55 #define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)
58 static int drm_debugfs_open(struct inode
*inode
, struct file
*file
)
60 struct drm_info_node
*node
= inode
->i_private
;
62 return single_open(file
, node
->info_ent
->show
, node
);
66 static const struct file_operations drm_debugfs_fops
= {
68 .open
= drm_debugfs_open
,
71 .release
= single_release
,
76 * Initialize a given set of debugfs files for a device
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
84 * Create a given set of debugfs files represented by an array of
85 * gdm_debugfs_lists in the given root directory.
87 int drm_debugfs_create_files(struct drm_info_list
*files
, int count
,
88 struct dentry
*root
, struct drm_minor
*minor
)
90 struct drm_device
*dev
= minor
->dev
;
92 struct drm_info_node
*tmp
;
95 for (i
= 0; i
< count
; i
++) {
96 u32 features
= files
[i
].driver_features
;
99 (dev
->driver
->driver_features
& features
) != features
)
102 tmp
= kmalloc(sizeof(struct drm_info_node
), GFP_KERNEL
);
107 ent
= debugfs_create_file(files
[i
].name
, S_IFREG
| S_IRUGO
,
108 root
, tmp
, &drm_debugfs_fops
);
110 DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n",
111 root
->d_name
.name
, files
[i
].name
);
119 tmp
->info_ent
= &files
[i
];
121 mutex_lock(&minor
->debugfs_lock
);
122 list_add(&tmp
->list
, &minor
->debugfs_list
);
123 mutex_unlock(&minor
->debugfs_lock
);
128 drm_debugfs_remove_files(files
, count
, minor
);
131 EXPORT_SYMBOL(drm_debugfs_create_files
);
134 * Initialize the DRI debugfs filesystem for a device
136 * \param dev DRM device
137 * \param minor device minor number
138 * \param root DRI debugfs dir entry.
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%".
144 int drm_debugfs_init(struct drm_minor
*minor
, int minor_id
,
147 struct drm_device
*dev
= minor
->dev
;
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
);
160 ret
= drm_debugfs_create_files(drm_debugfs_list
, DRM_DEBUGFS_ENTRIES
,
161 minor
->debugfs_root
, minor
);
163 debugfs_remove(minor
->debugfs_root
);
164 minor
->debugfs_root
= NULL
;
165 DRM_ERROR("Failed to create core drm debugfs files\n");
169 if (dev
->driver
->debugfs_init
) {
170 ret
= dev
->driver
->debugfs_init(minor
);
172 DRM_ERROR("DRM: Driver failed to initialize "
173 "/sys/kernel/debug/dri.\n");
182 * Remove a list of debugfs files
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.
189 * Remove all debugfs entries created by debugfs_init().
191 int drm_debugfs_remove_files(struct drm_info_list
*files
, int count
,
192 struct drm_minor
*minor
)
194 struct list_head
*pos
, *q
;
195 struct drm_info_node
*tmp
;
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
);
209 mutex_unlock(&minor
->debugfs_lock
);
212 EXPORT_SYMBOL(drm_debugfs_remove_files
);
215 * Cleanup the debugfs filesystem resources.
217 * \param minor device minor number.
218 * \return always zero.
220 * Remove all debugfs entries created by debugfs_init().
222 int drm_debugfs_cleanup(struct drm_minor
*minor
)
224 struct drm_device
*dev
= minor
->dev
;
226 if (!minor
->debugfs_root
)
229 if (dev
->driver
->debugfs_cleanup
)
230 dev
->driver
->debugfs_cleanup(minor
);
232 drm_debugfs_remove_files(drm_debugfs_list
, DRM_DEBUGFS_ENTRIES
, minor
);
234 debugfs_remove(minor
->debugfs_root
);
235 minor
->debugfs_root
= NULL
;
240 #endif /* CONFIG_DEBUG_FS */