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