1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Kernel module for testing dynamic_debug
4  *
5  * Authors:
6  *      Jim Cromie	<jim.cromie@gmail.com>
7  */
8 
9 #define pr_fmt(fmt) "test_dd: " fmt
10 
11 #include <linux/module.h>
12 
13 /* run tests by reading or writing sysfs node: do_prints */
14 
15 static void do_prints(void); /* device under test */
param_set_do_prints(const char * instr,const struct kernel_param * kp)16 static int param_set_do_prints(const char *instr, const struct kernel_param *kp)
17 {
18 	do_prints();
19 	return 0;
20 }
param_get_do_prints(char * buffer,const struct kernel_param * kp)21 static int param_get_do_prints(char *buffer, const struct kernel_param *kp)
22 {
23 	do_prints();
24 	return scnprintf(buffer, PAGE_SIZE, "did do_prints\n");
25 }
26 static const struct kernel_param_ops param_ops_do_prints = {
27 	.set = param_set_do_prints,
28 	.get = param_get_do_prints,
29 };
30 module_param_cb(do_prints, &param_ops_do_prints, NULL, 0600);
31 
32 /*
33  * Using the CLASSMAP api:
34  * - classmaps must have corresponding enum
35  * - enum symbols must match/correlate with class-name strings in the map.
36  * - base must equal enum's 1st value
37  * - multiple maps must set their base to share the 0-30 class_id space !!
38  *   (build-bug-on tips welcome)
39  * Additionally, here:
40  * - tie together sysname, mapname, bitsname, flagsname
41  */
42 #define DD_SYS_WRAP(_model, _flags)					\
43 	static unsigned long bits_##_model;				\
44 	static struct ddebug_class_param _flags##_model = {		\
45 		.bits = &bits_##_model,					\
46 		.flags = #_flags,					\
47 		.map = &map_##_model,					\
48 	};								\
49 	module_param_cb(_flags##_##_model, &param_ops_dyndbg_classes, &_flags##_model, 0600)
50 
51 /* numeric input, independent bits */
52 enum cat_disjoint_bits {
53 	D2_CORE = 0,
54 	D2_DRIVER,
55 	D2_KMS,
56 	D2_PRIME,
57 	D2_ATOMIC,
58 	D2_VBL,
59 	D2_STATE,
60 	D2_LEASE,
61 	D2_DP,
62 	D2_DRMRES };
63 DECLARE_DYNDBG_CLASSMAP(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS, 0,
64 			"D2_CORE",
65 			"D2_DRIVER",
66 			"D2_KMS",
67 			"D2_PRIME",
68 			"D2_ATOMIC",
69 			"D2_VBL",
70 			"D2_STATE",
71 			"D2_LEASE",
72 			"D2_DP",
73 			"D2_DRMRES");
74 DD_SYS_WRAP(disjoint_bits, p);
75 DD_SYS_WRAP(disjoint_bits, T);
76 
77 /* symbolic input, independent bits */
78 enum cat_disjoint_names { LOW = 11, MID, HI };
79 DECLARE_DYNDBG_CLASSMAP(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, 10,
80 			"LOW", "MID", "HI");
81 DD_SYS_WRAP(disjoint_names, p);
82 DD_SYS_WRAP(disjoint_names, T);
83 
84 /* numeric verbosity, V2 > V1 related */
85 enum cat_level_num { V0 = 14, V1, V2, V3, V4, V5, V6, V7 };
86 DECLARE_DYNDBG_CLASSMAP(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14,
87 		       "V0", "V1", "V2", "V3", "V4", "V5", "V6", "V7");
88 DD_SYS_WRAP(level_num, p);
89 DD_SYS_WRAP(level_num, T);
90 
91 /* symbolic verbosity */
92 enum cat_level_names { L0 = 22, L1, L2, L3, L4, L5, L6, L7 };
93 DECLARE_DYNDBG_CLASSMAP(map_level_names, DD_CLASS_TYPE_LEVEL_NAMES, 22,
94 			"L0", "L1", "L2", "L3", "L4", "L5", "L6", "L7");
95 DD_SYS_WRAP(level_names, p);
96 DD_SYS_WRAP(level_names, T);
97 
98 /* stand-in for all pr_debug etc */
99 #define prdbg(SYM) __pr_debug_cls(SYM, #SYM " msg\n")
100 
do_cats(void)101 static void do_cats(void)
102 {
103 	pr_debug("doing categories\n");
104 
105 	prdbg(LOW);
106 	prdbg(MID);
107 	prdbg(HI);
108 
109 	prdbg(D2_CORE);
110 	prdbg(D2_DRIVER);
111 	prdbg(D2_KMS);
112 	prdbg(D2_PRIME);
113 	prdbg(D2_ATOMIC);
114 	prdbg(D2_VBL);
115 	prdbg(D2_STATE);
116 	prdbg(D2_LEASE);
117 	prdbg(D2_DP);
118 	prdbg(D2_DRMRES);
119 }
120 
do_levels(void)121 static void do_levels(void)
122 {
123 	pr_debug("doing levels\n");
124 
125 	prdbg(V1);
126 	prdbg(V2);
127 	prdbg(V3);
128 	prdbg(V4);
129 	prdbg(V5);
130 	prdbg(V6);
131 	prdbg(V7);
132 
133 	prdbg(L1);
134 	prdbg(L2);
135 	prdbg(L3);
136 	prdbg(L4);
137 	prdbg(L5);
138 	prdbg(L6);
139 	prdbg(L7);
140 }
141 
do_prints(void)142 static void do_prints(void)
143 {
144 	do_cats();
145 	do_levels();
146 }
147 
test_dynamic_debug_init(void)148 static int __init test_dynamic_debug_init(void)
149 {
150 	pr_debug("init start\n");
151 	do_prints();
152 	pr_debug("init done\n");
153 	return 0;
154 }
155 
test_dynamic_debug_exit(void)156 static void __exit test_dynamic_debug_exit(void)
157 {
158 	pr_debug("exited\n");
159 }
160 
161 module_init(test_dynamic_debug_init);
162 module_exit(test_dynamic_debug_exit);
163 
164 MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
165 MODULE_DESCRIPTION("Kernel module for testing dynamic_debug");
166 MODULE_LICENSE("GPL");
167