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4
5
6#include <linux/kernel.h>
7
8#include "i915_debugfs_params.h"
9#include "i915_drv.h"
10#include "i915_params.h"
11
12
13static int i915_param_int_show(struct seq_file *m, void *data)
14{
15 int *value = m->private;
16
17 seq_printf(m, "%d\n", *value);
18
19 return 0;
20}
21
22static int i915_param_int_open(struct inode *inode, struct file *file)
23{
24 return single_open(file, i915_param_int_show, inode->i_private);
25}
26
27static ssize_t i915_param_int_write(struct file *file,
28 const char __user *ubuf, size_t len,
29 loff_t *offp)
30{
31 struct seq_file *m = file->private_data;
32 int *value = m->private;
33 int ret;
34
35 ret = kstrtoint_from_user(ubuf, len, 0, value);
36 if (ret) {
37
38 bool b;
39
40 ret = kstrtobool_from_user(ubuf, len, &b);
41 if (!ret)
42 *value = b;
43 }
44
45 return ret ?: len;
46}
47
48static const struct file_operations i915_param_int_fops = {
49 .owner = THIS_MODULE,
50 .open = i915_param_int_open,
51 .read = seq_read,
52 .write = i915_param_int_write,
53 .llseek = default_llseek,
54 .release = single_release,
55};
56
57static const struct file_operations i915_param_int_fops_ro = {
58 .owner = THIS_MODULE,
59 .open = i915_param_int_open,
60 .read = seq_read,
61 .llseek = default_llseek,
62 .release = single_release,
63};
64
65
66static int i915_param_uint_show(struct seq_file *m, void *data)
67{
68 unsigned int *value = m->private;
69
70 seq_printf(m, "%u\n", *value);
71
72 return 0;
73}
74
75static int i915_param_uint_open(struct inode *inode, struct file *file)
76{
77 return single_open(file, i915_param_uint_show, inode->i_private);
78}
79
80static ssize_t i915_param_uint_write(struct file *file,
81 const char __user *ubuf, size_t len,
82 loff_t *offp)
83{
84 struct seq_file *m = file->private_data;
85 unsigned int *value = m->private;
86 int ret;
87
88 ret = kstrtouint_from_user(ubuf, len, 0, value);
89 if (ret) {
90
91 bool b;
92
93 ret = kstrtobool_from_user(ubuf, len, &b);
94 if (!ret)
95 *value = b;
96 }
97
98 return ret ?: len;
99}
100
101static const struct file_operations i915_param_uint_fops = {
102 .owner = THIS_MODULE,
103 .open = i915_param_uint_open,
104 .read = seq_read,
105 .write = i915_param_uint_write,
106 .llseek = default_llseek,
107 .release = single_release,
108};
109
110static const struct file_operations i915_param_uint_fops_ro = {
111 .owner = THIS_MODULE,
112 .open = i915_param_uint_open,
113 .read = seq_read,
114 .llseek = default_llseek,
115 .release = single_release,
116};
117
118
119static int i915_param_charp_show(struct seq_file *m, void *data)
120{
121 const char **s = m->private;
122
123 seq_printf(m, "%s\n", *s);
124
125 return 0;
126}
127
128static int i915_param_charp_open(struct inode *inode, struct file *file)
129{
130 return single_open(file, i915_param_charp_show, inode->i_private);
131}
132
133static ssize_t i915_param_charp_write(struct file *file,
134 const char __user *ubuf, size_t len,
135 loff_t *offp)
136{
137 struct seq_file *m = file->private_data;
138 char **s = m->private;
139 char *new, *old;
140
141 old = *s;
142 new = strndup_user(ubuf, PAGE_SIZE);
143 if (IS_ERR(new)) {
144 len = PTR_ERR(new);
145 goto out;
146 }
147
148 *s = new;
149
150 kfree(old);
151out:
152 return len;
153}
154
155static const struct file_operations i915_param_charp_fops = {
156 .owner = THIS_MODULE,
157 .open = i915_param_charp_open,
158 .read = seq_read,
159 .write = i915_param_charp_write,
160 .llseek = default_llseek,
161 .release = single_release,
162};
163
164static const struct file_operations i915_param_charp_fops_ro = {
165 .owner = THIS_MODULE,
166 .open = i915_param_charp_open,
167 .read = seq_read,
168 .llseek = default_llseek,
169 .release = single_release,
170};
171
172#define RO(mode) (((mode) & 0222) == 0)
173
174static struct dentry *
175i915_debugfs_create_int(const char *name, umode_t mode,
176 struct dentry *parent, int *value)
177{
178 return debugfs_create_file_unsafe(name, mode, parent, value,
179 RO(mode) ? &i915_param_int_fops_ro :
180 &i915_param_int_fops);
181}
182
183static struct dentry *
184i915_debugfs_create_uint(const char *name, umode_t mode,
185 struct dentry *parent, unsigned int *value)
186{
187 return debugfs_create_file_unsafe(name, mode, parent, value,
188 RO(mode) ? &i915_param_uint_fops_ro :
189 &i915_param_uint_fops);
190}
191
192static struct dentry *
193i915_debugfs_create_charp(const char *name, umode_t mode,
194 struct dentry *parent, char **value)
195{
196 return debugfs_create_file(name, mode, parent, value,
197 RO(mode) ? &i915_param_charp_fops_ro :
198 &i915_param_charp_fops);
199}
200
201static __always_inline void
202_i915_param_create_file(struct dentry *parent, const char *name,
203 const char *type, int mode, void *value)
204{
205 if (!mode)
206 return;
207
208 if (!__builtin_strcmp(type, "bool"))
209 debugfs_create_bool(name, mode, parent, value);
210 else if (!__builtin_strcmp(type, "int"))
211 i915_debugfs_create_int(name, mode, parent, value);
212 else if (!__builtin_strcmp(type, "unsigned int"))
213 i915_debugfs_create_uint(name, mode, parent, value);
214 else if (!__builtin_strcmp(type, "unsigned long"))
215 debugfs_create_ulong(name, mode, parent, value);
216 else if (!__builtin_strcmp(type, "char *"))
217 i915_debugfs_create_charp(name, mode, parent, value);
218 else
219 WARN(1, "no debugfs fops defined for param type %s (i915.%s)\n",
220 type, name);
221}
222
223
224struct dentry *i915_debugfs_params(struct drm_i915_private *i915)
225{
226 struct drm_minor *minor = i915->drm.primary;
227 struct i915_params *params = &i915->params;
228 struct dentry *dir;
229
230 dir = debugfs_create_dir("i915_params", minor->debugfs_root);
231 if (IS_ERR(dir))
232 return dir;
233
234
235
236
237
238
239
240#define REGISTER(T, x, unused, mode, ...) _i915_param_create_file(dir, #x, #T, mode, ¶ms->x);
241 I915_PARAMS_FOR_EACH(REGISTER);
242#undef REGISTER
243
244 return dir;
245}
246
