Root/drivers/gpu/drm/drm_proc.c

1/**
2 * \file drm_proc.c
3 * /proc support for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 *
8 * \par Acknowledgements:
9 * Matthew J Sottek <matthew.j.sottek@intel.com> sent in a patch to fix
10 * the problem with the proc files not outputting all their information.
11 */
12
13/*
14 * Created: Mon Jan 11 09:48:47 1999 by faith@valinux.com
15 *
16 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
17 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
18 * All Rights Reserved.
19 *
20 * Permission is hereby granted, free of charge, to any person obtaining a
21 * copy of this software and associated documentation files (the "Software"),
22 * to deal in the Software without restriction, including without limitation
23 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
24 * and/or sell copies of the Software, and to permit persons to whom the
25 * Software is furnished to do so, subject to the following conditions:
26 *
27 * The above copyright notice and this permission notice (including the next
28 * paragraph) shall be included in all copies or substantial portions of the
29 * Software.
30 *
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
32 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
33 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
34 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
35 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
36 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
37 * OTHER DEALINGS IN THE SOFTWARE.
38 */
39
40#include <linux/seq_file.h>
41#include <linux/slab.h>
42#include <linux/export.h>
43#include "drmP.h"
44
45/***************************************************
46 * Initialization, etc.
47 **************************************************/
48
49/**
50 * Proc file list.
51 */
52static struct drm_info_list drm_proc_list[] = {
53    {"name", drm_name_info, 0},
54    {"vm", drm_vm_info, 0},
55    {"clients", drm_clients_info, 0},
56    {"bufs", drm_bufs_info, 0},
57    {"gem_names", drm_gem_name_info, DRIVER_GEM},
58#if DRM_DEBUG_CODE
59    {"vma", drm_vma_info, 0},
60#endif
61};
62#define DRM_PROC_ENTRIES ARRAY_SIZE(drm_proc_list)
63
64static int drm_proc_open(struct inode *inode, struct file *file)
65{
66    struct drm_info_node* node = PDE(inode)->data;
67
68    return single_open(file, node->info_ent->show, node);
69}
70
71static const struct file_operations drm_proc_fops = {
72    .owner = THIS_MODULE,
73    .open = drm_proc_open,
74    .read = seq_read,
75    .llseek = seq_lseek,
76    .release = single_release,
77};
78
79
80/**
81 * Initialize a given set of proc files for a device
82 *
83 * \param files The array of files to create
84 * \param count The number of files given
85 * \param root DRI proc dir entry.
86 * \param minor device minor number
87 * \return Zero on success, non-zero on failure
88 *
89 * Create a given set of proc files represented by an array of
90 * gdm_proc_lists in the given root directory.
91 */
92static int drm_proc_create_files(struct drm_info_list *files, int count,
93              struct proc_dir_entry *root, struct drm_minor *minor)
94{
95    struct drm_device *dev = minor->dev;
96    struct proc_dir_entry *ent;
97    struct drm_info_node *tmp;
98    int i, ret;
99
100    for (i = 0; i < count; i++) {
101        u32 features = files[i].driver_features;
102
103        if (features != 0 &&
104            (dev->driver->driver_features & features) != features)
105            continue;
106
107        tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);
108        if (tmp == NULL) {
109            ret = -1;
110            goto fail;
111        }
112        tmp->minor = minor;
113        tmp->info_ent = &files[i];
114        list_add(&tmp->list, &minor->proc_nodes.list);
115
116        ent = proc_create_data(files[i].name, S_IRUGO, root,
117                       &drm_proc_fops, tmp);
118        if (!ent) {
119            DRM_ERROR("Cannot create /proc/dri/%s/%s\n",
120                  root->name, files[i].name);
121            list_del(&tmp->list);
122            kfree(tmp);
123            ret = -1;
124            goto fail;
125        }
126
127    }
128    return 0;
129
130fail:
131    for (i = 0; i < count; i++)
132        remove_proc_entry(drm_proc_list[i].name, minor->proc_root);
133    return ret;
134}
135
136/**
137 * Initialize the DRI proc filesystem for a device
138 *
139 * \param dev DRM device
140 * \param minor device minor number
141 * \param root DRI proc dir entry.
142 * \param dev_root resulting DRI device proc dir entry.
143 * \return root entry pointer on success, or NULL on failure.
144 *
145 * Create the DRI proc root entry "/proc/dri", the device proc root entry
146 * "/proc/dri/%minor%/", and each entry in proc_list as
147 * "/proc/dri/%minor%/%name%".
148 */
149int drm_proc_init(struct drm_minor *minor, int minor_id,
150          struct proc_dir_entry *root)
151{
152    char name[64];
153    int ret;
154
155    INIT_LIST_HEAD(&minor->proc_nodes.list);
156    sprintf(name, "%d", minor_id);
157    minor->proc_root = proc_mkdir(name, root);
158    if (!minor->proc_root) {
159        DRM_ERROR("Cannot create /proc/dri/%s\n", name);
160        return -1;
161    }
162
163    ret = drm_proc_create_files(drm_proc_list, DRM_PROC_ENTRIES,
164                    minor->proc_root, minor);
165    if (ret) {
166        remove_proc_entry(name, root);
167        minor->proc_root = NULL;
168        DRM_ERROR("Failed to create core drm proc files\n");
169        return ret;
170    }
171
172    return 0;
173}
174
175static int drm_proc_remove_files(struct drm_info_list *files, int count,
176              struct drm_minor *minor)
177{
178    struct list_head *pos, *q;
179    struct drm_info_node *tmp;
180    int i;
181
182    for (i = 0; i < count; i++) {
183        list_for_each_safe(pos, q, &minor->proc_nodes.list) {
184            tmp = list_entry(pos, struct drm_info_node, list);
185            if (tmp->info_ent == &files[i]) {
186                remove_proc_entry(files[i].name,
187                          minor->proc_root);
188                list_del(pos);
189                kfree(tmp);
190            }
191        }
192    }
193    return 0;
194}
195
196/**
197 * Cleanup the proc filesystem resources.
198 *
199 * \param minor device minor number.
200 * \param root DRI proc dir entry.
201 * \param dev_root DRI device proc dir entry.
202 * \return always zero.
203 *
204 * Remove all proc entries created by proc_init().
205 */
206int drm_proc_cleanup(struct drm_minor *minor, struct proc_dir_entry *root)
207{
208    char name[64];
209
210    if (!root || !minor->proc_root)
211        return 0;
212
213    drm_proc_remove_files(drm_proc_list, DRM_PROC_ENTRIES, minor);
214
215    sprintf(name, "%d", minor->index);
216    remove_proc_entry(name, root);
217
218    return 0;
219}
220
221

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