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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Kernel module for testing dynamic_debug4 *5 * Authors:6 * Jim Cromie <jim.cromie@gmail.com>7 */8 9#define pr_fmt(fmt) "test_dd: " fmt10 11#include <linux/module.h>12 13/* run tests by reading or writing sysfs node: do_prints */14 15static void do_prints(void); /* device under test */16static int param_set_do_prints(const char *instr, const struct kernel_param *kp)17{18 do_prints();19 return 0;20}21static 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}26static const struct kernel_param_ops param_ops_do_prints = {27 .set = param_set_do_prints,28 .get = param_get_do_prints,29};30module_param_cb(do_prints, ¶m_ops_do_prints, NULL, 0600);31 32/*33 * Using the CLASSMAP api:34 * - classmaps must have corresponding enum35 * - enum symbols must match/correlate with class-name strings in the map.36 * - base must equal enum's 1st value37 * - 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, flagsname41 */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, ¶m_ops_dyndbg_classes, &_flags##_model, 0600)50 51/* numeric input, independent bits */52enum 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 };63DECLARE_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");74DD_SYS_WRAP(disjoint_bits, p);75DD_SYS_WRAP(disjoint_bits, T);76 77/* symbolic input, independent bits */78enum cat_disjoint_names { LOW = 11, MID, HI };79DECLARE_DYNDBG_CLASSMAP(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, 10,80 "LOW", "MID", "HI");81DD_SYS_WRAP(disjoint_names, p);82DD_SYS_WRAP(disjoint_names, T);83 84/* numeric verbosity, V2 > V1 related */85enum cat_level_num { V0 = 14, V1, V2, V3, V4, V5, V6, V7 };86DECLARE_DYNDBG_CLASSMAP(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14,87 "V0", "V1", "V2", "V3", "V4", "V5", "V6", "V7");88DD_SYS_WRAP(level_num, p);89DD_SYS_WRAP(level_num, T);90 91/* symbolic verbosity */92enum cat_level_names { L0 = 22, L1, L2, L3, L4, L5, L6, L7 };93DECLARE_DYNDBG_CLASSMAP(map_level_names, DD_CLASS_TYPE_LEVEL_NAMES, 22,94 "L0", "L1", "L2", "L3", "L4", "L5", "L6", "L7");95DD_SYS_WRAP(level_names, p);96DD_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 101static 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 121static 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 142static void do_prints(void)143{144 do_cats();145 do_levels();146}147 148static 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 156static void __exit test_dynamic_debug_exit(void)157{158 pr_debug("exited\n");159}160 161module_init(test_dynamic_debug_init);162module_exit(test_dynamic_debug_exit);163 164MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");165MODULE_DESCRIPTION("Kernel module for testing dynamic_debug");166MODULE_LICENSE("GPL");167