// SPDX-License-Identifier: GPL-2.0-only
/*
* Kernel module for testing dynamic_debug
*
* Authors :
* Jim Cromie < jim . cromie @ gmail . com >
*/
#define pr_fmt(fmt) "test_dd: " fmt
#include <linux/module.h>
/* run tests by reading or writing sysfs node: do_prints */
static void do_prints(void ); /* device under test */
static int param_set_do_prints(const char *instr, const struct kernel_param *kp)
{
do_prints();
return 0 ;
}
static int param_get_do_prints(char *buffer, const struct kernel_param *kp)
{
do_prints();
return scnprintf(buffer, PAGE_SIZE, "did do_prints\n" );
}
static const struct kernel_param_ops param_ops_do_prints = {
.set = param_set_do_prints,
.get = param_get_do_prints,
};
module_param_cb(do_prints, ¶m_ops_do_prints, NULL, 0600 );
/*
* Using the CLASSMAP api :
* - classmaps must have corresponding enum
* - enum symbols must match / correlate with class - name strings in the map .
* - base must equal enum ' s 1 st value
* - multiple maps must set their base to share the 0 - 30 class_id space ! !
* ( build - bug - on tips welcome )
* Additionally , here :
* - tie together sysname , mapname , bitsname , flagsname
*/
#define DD_SYS_WRAP(_model, _flags) \
static unsigned long bits_## _model; \
static struct ddebug_class_param _flags## _model = { \
.bits = &bits_## _model, \
.flags = #_ flags, \
.map = &map_## _model, \
}; \
module_param_cb(_flags## _## _model, ¶m_ops_dyndbg_classes, &_flags## _model, 0600 )
/* numeric input, independent bits */
enum cat_disjoint_bits {
D2_CORE = 0 ,
D2_DRIVER,
D2_KMS,
D2_PRIME,
D2_ATOMIC,
D2_VBL,
D2_STATE,
D2_LEASE,
D2_DP,
D2_DRMRES };
DECLARE_DYNDBG_CLASSMAP(map_disjoint_bits, DD_CLASS_TYPE_DISJOINT_BITS, 0 ,
"D2_CORE" ,
"D2_DRIVER" ,
"D2_KMS" ,
"D2_PRIME" ,
"D2_ATOMIC" ,
"D2_VBL" ,
"D2_STATE" ,
"D2_LEASE" ,
"D2_DP" ,
"D2_DRMRES" );
DD_SYS_WRAP(disjoint_bits, p);
DD_SYS_WRAP(disjoint_bits, T);
/* symbolic input, independent bits */
enum cat_disjoint_names { LOW = 11 , MID, HI };
DECLARE_DYNDBG_CLASSMAP(map_disjoint_names, DD_CLASS_TYPE_DISJOINT_NAMES, 10 ,
"LOW" , "MID" , "HI" );
DD_SYS_WRAP(disjoint_names, p);
DD_SYS_WRAP(disjoint_names, T);
/* numeric verbosity, V2 > V1 related */
enum cat_level_num { V0 = 14 , V1, V2, V3, V4, V5, V6, V7 };
DECLARE_DYNDBG_CLASSMAP(map_level_num, DD_CLASS_TYPE_LEVEL_NUM, 14 ,
"V0" , "V1" , "V2" , "V3" , "V4" , "V5" , "V6" , "V7" );
DD_SYS_WRAP(level_num, p);
DD_SYS_WRAP(level_num, T);
/* symbolic verbosity */
enum cat_level_names { L0 = 22 , L1, L2, L3, L4, L5, L6, L7 };
DECLARE_DYNDBG_CLASSMAP(map_level_names, DD_CLASS_TYPE_LEVEL_NAMES, 22 ,
"L0" , "L1" , "L2" , "L3" , "L4" , "L5" , "L6" , "L7" );
DD_SYS_WRAP(level_names, p);
DD_SYS_WRAP(level_names, T);
/* stand-in for all pr_debug etc */
#define prdbg(SYM) __pr_debug_cls(SYM, #SYM " msg\n" )
static void do_cats(void )
{
pr_debug("doing categories\n" );
prdbg(LOW);
prdbg(MID);
prdbg(HI);
prdbg(D2_CORE);
prdbg(D2_DRIVER);
prdbg(D2_KMS);
prdbg(D2_PRIME);
prdbg(D2_ATOMIC);
prdbg(D2_VBL);
prdbg(D2_STATE);
prdbg(D2_LEASE);
prdbg(D2_DP);
prdbg(D2_DRMRES);
}
static void do_levels(void )
{
pr_debug("doing levels\n" );
prdbg(V1);
prdbg(V2);
prdbg(V3);
prdbg(V4);
prdbg(V5);
prdbg(V6);
prdbg(V7);
prdbg(L1);
prdbg(L2);
prdbg(L3);
prdbg(L4);
prdbg(L5);
prdbg(L6);
prdbg(L7);
}
static void do_prints(void )
{
do_cats();
do_levels();
}
static int __init test_dynamic_debug_init(void )
{
pr_debug("init start\n" );
do_prints();
pr_debug("init done\n" );
return 0 ;
}
static void __exit test_dynamic_debug_exit(void )
{
pr_debug("exited\n" );
}
module_init(test_dynamic_debug_init);
module_exit(test_dynamic_debug_exit);
MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>" );
MODULE_DESCRIPTION("Kernel module for testing dynamic_debug" );
MODULE_LICENSE("GPL" );
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