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 */
i915_param_int_show(struct seq_file * m,void * data)25 static int i915_param_int_show(struct seq_file *m, void *data)
26 {
27 int *value = m->private;
28
29 seq_printf(m, "%d\n", *value);
30
31 return 0;
32 }
33
i915_param_int_open(struct inode * inode,struct file * file)34 static 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
notify_guc(struct drm_i915_private * i915)39 static 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))
46 ret = intel_guc_global_policies_update(>->uc.guc);
47 }
48
49 return ret;
50 }
51
i915_param_int_write(struct file * file,const char __user * ubuf,size_t len,loff_t * offp)52 static 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(ubuf, len, 0, value);
61 if (ret) {
62 /* support boolean values too */
63 bool b;
64
65 ret = kstrtobool_from_user(ubuf, len, &b);
66 if (!ret)
67 *value = b;
68 }
69
70 return ret ?: len;
71 }
72
73 static 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
82 static 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 */
i915_param_uint_show(struct seq_file * m,void * data)91 static int i915_param_uint_show(struct seq_file *m, void *data)
92 {
93 unsigned int *value = m->private;
94
95 seq_printf(m, "%u\n", *value);
96
97 return 0;
98 }
99
i915_param_uint_open(struct inode * inode,struct file * file)100 static 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
i915_param_uint_write(struct file * file,const char __user * ubuf,size_t len,loff_t * offp)105 static 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(ubuf, len, 0, value);
116 if (ret) {
117 /* support boolean values too */
118 bool b;
119
120 ret = kstrtobool_from_user(ubuf, len, &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
136 static 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
145 static 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 */
i915_param_charp_show(struct seq_file * m,void * data)154 static int i915_param_charp_show(struct seq_file *m, void *data)
155 {
156 const char **s = m->private;
157
158 seq_printf(m, "%s\n", *s);
159
160 return 0;
161 }
162
i915_param_charp_open(struct inode * inode,struct file * file)163 static 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
i915_param_charp_write(struct file * file,const char __user * ubuf,size_t len,loff_t * offp)168 static 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(new)) {
179 len = PTR_ERR(new);
180 goto out;
181 }
182
183 *s = new;
184
185 kfree(old);
186 out:
187 return len;
188 }
189
190 static 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
199 static 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
209 static struct dentry *
i915_debugfs_create_int(const char * name,umode_t mode,struct dentry * parent,int * value)210 i915_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, value,
214 RO(mode) ? &i915_param_int_fops_ro :
215 &i915_param_int_fops);
216 }
217
218 static struct dentry *
i915_debugfs_create_uint(const char * name,umode_t mode,struct dentry * parent,unsigned int * value)219 i915_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, value,
223 RO(mode) ? &i915_param_uint_fops_ro :
224 &i915_param_uint_fops);
225 }
226
227 static struct dentry *
i915_debugfs_create_charp(const char * name,umode_t mode,struct dentry * parent,char ** value)228 i915_debugfs_create_charp(const char *name, umode_t mode,
229 struct dentry *parent, char **value)
230 {
231 return debugfs_create_file(name, mode, parent, 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 */
i915_debugfs_params(struct drm_i915_private * i915)248 struct 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("i915_params", minor->debugfs_root);
255 if (IS_ERR(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, ¶ms->x);
265 I915_PARAMS_FOR_EACH(REGISTER);
266 #undef REGISTER
267
268 return dir;
269 }
270