mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 12:11:40 +00:00
6ea3bf466a
Demonstrate use of DECLARE_DYNDBG_CLASSMAP macro, and expose them as
sysfs-nodes for testing.
For each of the 4 class-map-types:
- declare a class-map of that type,
- declare the enum corresponding to those class-names
- share _base across 0..30 range
- add a __pr_debug_cls() call for each class-name
- declare 2 sysnodes for each class-map
for 'p' flag, and future 'T' flag
These declarations create the following sysfs parameter interface:
:#> pwd
/sys/module/test_dynamic_debug/parameters
:#> ls
T_disjoint_bits T_disjoint_names T_level_names T_level_num do_prints
p_disjoint_bits p_disjoint_names p_level_names p_level_num
NOTES:
The local wrapper macro is an api candidate, but there are already too
many parameters. OTOH, maybe related enum should be in there too,
since it has _base inter-dependencies.
The T_* params control the (future) T flag on the same class'd
pr_debug callsites as their p* counterparts. Using them will fail,
until the dyndbg-trace patches are added in.
:#> echo 1 > T_disjoint
[ 28.792489] dyndbg: disjoint: 0x1 > test_dynamic_debug.T_D2
[ 28.793848] dyndbg: query 0: "class D2_CORE +T" mod:*
[ 28.795086] dyndbg: split into words: "class" "D2_CORE" "+T"
[ 28.796467] dyndbg: op='+'
[ 28.797148] dyndbg: unknown flag 'T'
[ 28.798021] dyndbg: flags parse failed
[ 28.798947] dyndbg: processed 1 queries, with 0 matches, 1 errs
[ 28.800378] dyndbg: bit_0: -22 matches on class: D2_CORE -> 0x1
[ 28.801959] dyndbg: test_dynamic_debug.T_D2: updated 0x0 -> 0x1
[ 28.803974] dyndbg: total matches: -22
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20220904214134.408619-22-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
166 lines
3.7 KiB
C
166 lines
3.7 KiB
C
// 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 1st 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_LICENSE("GPL");
|