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

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