Loading...
1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2019 Intel Corporation
4 */
5
6#include <linux/kernel.h>
7#include <linux/debugfs.h>
8
9#include "i915_debugfs_params.h"
10#include "gt/intel_gt.h"
11#include "gt/uc/intel_guc.h"
12#include "i915_drv.h"
13#include "i915_params.h"
14
15#define MATCH_DEBUGFS_NODE_NAME(_file, _name) \
16 (strcmp((_file)->f_path.dentry->d_name.name, (_name)) == 0)
17
18#define GET_I915(i915, name, ptr) \
19 do { \
20 struct i915_params *params; \
21 params = container_of(((void *)(ptr)), typeof(*params), name); \
22 (i915) = container_of(params, typeof(*(i915)), params); \
23 } while (0)
24
25/* int param */
26static int i915_param_int_show(struct seq_file *m, void *data)
27{
28 int *value = m->private;
29
30 seq_printf(m, "%d\n", *value);
31
32 return 0;
33}
34
35static int i915_param_int_open(struct inode *inode, struct file *file)
36{
37 return single_open(file, i915_param_int_show, inode->i_private);
38}
39
40static int notify_guc(struct drm_i915_private *i915)
41{
42 struct intel_gt *gt;
43 int i, ret = 0;
44
45 for_each_gt(gt, i915, i) {
46 if (intel_uc_uses_guc_submission(>->uc))
47 ret = intel_guc_global_policies_update(>->uc.guc);
48 }
49
50 return ret;
51}
52
53static ssize_t i915_param_int_write(struct file *file,
54 const char __user *ubuf, size_t len,
55 loff_t *offp)
56{
57 struct seq_file *m = file->private_data;
58 int *value = m->private;
59 int ret;
60
61 ret = kstrtoint_from_user(ubuf, len, 0, value);
62 if (ret) {
63 /* support boolean values too */
64 bool b;
65
66 ret = kstrtobool_from_user(ubuf, len, &b);
67 if (!ret)
68 *value = b;
69 }
70
71 return ret ?: len;
72}
73
74static const struct file_operations i915_param_int_fops = {
75 .owner = THIS_MODULE,
76 .open = i915_param_int_open,
77 .read = seq_read,
78 .write = i915_param_int_write,
79 .llseek = default_llseek,
80 .release = single_release,
81};
82
83static const struct file_operations i915_param_int_fops_ro = {
84 .owner = THIS_MODULE,
85 .open = i915_param_int_open,
86 .read = seq_read,
87 .llseek = default_llseek,
88 .release = single_release,
89};
90
91/* unsigned int param */
92static int i915_param_uint_show(struct seq_file *m, void *data)
93{
94 unsigned int *value = m->private;
95
96 seq_printf(m, "%u\n", *value);
97
98 return 0;
99}
100
101static int i915_param_uint_open(struct inode *inode, struct file *file)
102{
103 return single_open(file, i915_param_uint_show, inode->i_private);
104}
105
106static ssize_t i915_param_uint_write(struct file *file,
107 const char __user *ubuf, size_t len,
108 loff_t *offp)
109{
110 struct drm_i915_private *i915;
111 struct seq_file *m = file->private_data;
112 unsigned int *value = m->private;
113 unsigned int old = *value;
114 int ret;
115
116 ret = kstrtouint_from_user(ubuf, len, 0, value);
117 if (ret) {
118 /* support boolean values too */
119 bool b;
120
121 ret = kstrtobool_from_user(ubuf, len, &b);
122 if (!ret)
123 *value = b;
124 }
125
126 if (!ret && MATCH_DEBUGFS_NODE_NAME(file, "reset")) {
127 GET_I915(i915, reset, value);
128
129 ret = notify_guc(i915);
130 if (ret)
131 *value = old;
132 }
133
134 return ret ?: len;
135}
136
137static const struct file_operations i915_param_uint_fops = {
138 .owner = THIS_MODULE,
139 .open = i915_param_uint_open,
140 .read = seq_read,
141 .write = i915_param_uint_write,
142 .llseek = default_llseek,
143 .release = single_release,
144};
145
146static const struct file_operations i915_param_uint_fops_ro = {
147 .owner = THIS_MODULE,
148 .open = i915_param_uint_open,
149 .read = seq_read,
150 .llseek = default_llseek,
151 .release = single_release,
152};
153
154/* char * param */
155static int i915_param_charp_show(struct seq_file *m, void *data)
156{
157 const char **s = m->private;
158
159 seq_printf(m, "%s\n", *s);
160
161 return 0;
162}
163
164static int i915_param_charp_open(struct inode *inode, struct file *file)
165{
166 return single_open(file, i915_param_charp_show, inode->i_private);
167}
168
169static ssize_t i915_param_charp_write(struct file *file,
170 const char __user *ubuf, size_t len,
171 loff_t *offp)
172{
173 struct seq_file *m = file->private_data;
174 char **s = m->private;
175 char *new, *old;
176
177 old = *s;
178 new = strndup_user(ubuf, PAGE_SIZE);
179 if (IS_ERR(new)) {
180 len = PTR_ERR(new);
181 goto out;
182 }
183
184 *s = new;
185
186 kfree(old);
187out:
188 return len;
189}
190
191static const struct file_operations i915_param_charp_fops = {
192 .owner = THIS_MODULE,
193 .open = i915_param_charp_open,
194 .read = seq_read,
195 .write = i915_param_charp_write,
196 .llseek = default_llseek,
197 .release = single_release,
198};
199
200static const struct file_operations i915_param_charp_fops_ro = {
201 .owner = THIS_MODULE,
202 .open = i915_param_charp_open,
203 .read = seq_read,
204 .llseek = default_llseek,
205 .release = single_release,
206};
207
208#define RO(mode) (((mode) & 0222) == 0)
209
210static struct dentry *
211i915_debugfs_create_int(const char *name, umode_t mode,
212 struct dentry *parent, int *value)
213{
214 return debugfs_create_file_unsafe(name, mode, parent, value,
215 RO(mode) ? &i915_param_int_fops_ro :
216 &i915_param_int_fops);
217}
218
219static struct dentry *
220i915_debugfs_create_uint(const char *name, umode_t mode,
221 struct dentry *parent, unsigned int *value)
222{
223 return debugfs_create_file_unsafe(name, mode, parent, value,
224 RO(mode) ? &i915_param_uint_fops_ro :
225 &i915_param_uint_fops);
226}
227
228static struct dentry *
229i915_debugfs_create_charp(const char *name, umode_t mode,
230 struct dentry *parent, char **value)
231{
232 return debugfs_create_file(name, mode, parent, value,
233 RO(mode) ? &i915_param_charp_fops_ro :
234 &i915_param_charp_fops);
235}
236
237#define _i915_param_create_file(parent, name, mode, valp) \
238 do { \
239 if (mode) \
240 _Generic(valp, \
241 bool *: debugfs_create_bool, \
242 int *: i915_debugfs_create_int, \
243 unsigned int *: i915_debugfs_create_uint, \
244 unsigned long *: debugfs_create_ulong, \
245 char **: i915_debugfs_create_charp)(name, mode, parent, valp); \
246 } while(0)
247
248/* add a subdirectory with files for each i915 param */
249struct dentry *i915_debugfs_params(struct drm_i915_private *i915)
250{
251 struct drm_minor *minor = i915->drm.primary;
252 struct i915_params *params = &i915->params;
253 struct dentry *dir;
254
255 dir = debugfs_create_dir("i915_params", minor->debugfs_root);
256 if (IS_ERR(dir))
257 return dir;
258
259 /*
260 * Note: We could create files for params needing special handling
261 * here. Set mode in params to 0 to skip the generic create file, or
262 * just let the generic create file fail silently with -EEXIST.
263 */
264
265#define REGISTER(T, x, unused, mode, ...) _i915_param_create_file(dir, #x, mode, ¶ms->x);
266 I915_PARAMS_FOR_EACH(REGISTER);
267#undef REGISTER
268
269 return dir;
270}
1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2019 Intel Corporation
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/* int param */
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 /* support boolean values too */
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/* unsigned int param */
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 /* support boolean values too */
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/* char * param */
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/* add a subdirectory with files for each i915 param */
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 * Note: We could create files for params needing special handling
236 * here. Set mode in params to 0 to skip the generic create file, or
237 * just let the generic create file fail silently with -EEXIST.
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}