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

source code of linux/drivers/gpu/drm/i915/i915_debugfs_params.c