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/* SPDX-License-Identifier: GPL-2.0-or-later */
/* Copyright (C) 2026 Richard Qin */
/*
* Boot Self-Test: klog
*
* Tests:
* 1. read vs read_consume semantics
* 2. subsystem mask filtering
* 3. ratelimit bookkeeping
* 4. flush advances console tail when console filtering is active
* 5. seq counter increments on writes
*/
#include <lume/selftest.h>
#include <lume/klog.h>
#include <string.h>
static void drain_klog()
{
static char buf[512];
while (true) {
int n = klog_read_consume(buf, sizeof(buf));
if (n <= 0) {
break;
}
}
}
static bool test_read_peek_and_consume()
{
drain_klog();
klog_ex(KLOG_INFO, KLOG_SUBSYS_TEST, "klog_test_a");
klog_ex(KLOG_INFO, KLOG_SUBSYS_TEST, "klog_test_b");
KlogStats s0;
klog_stats(&s0);
char buf[1024];
int n = klog_read(buf, sizeof(buf) - 1);
if (n <= 0) {
return false;
}
buf[n] = '\0';
if (!strstr(buf, "klog_test_a") || !strstr(buf, "klog_test_b")) {
return false;
}
KlogStats s1;
klog_stats(&s1);
if (s1.tail != s0.tail) {
return false;
}
int n2 = klog_read_consume(buf, sizeof(buf) - 1);
if (n2 <= 0) {
return false;
}
buf[n2] = '\0';
if (!strstr(buf, "klog_test_a") || !strstr(buf, "klog_test_b")) {
return false;
}
KlogStats s2;
klog_stats(&s2);
return s2.tail != s0.tail;
}
static bool test_subsys_mask()
{
drain_klog();
const uint64 all_mask = (1ULL << KLOG_SUBSYS_MAX) - 1;
klog_set_subsys_mask(1ULL << KLOG_SUBSYS_TEST);
klog_ex(KLOG_INFO, KLOG_SUBSYS_TEST, "klog_subsys_ok");
klog_ex(KLOG_INFO, KLOG_SUBSYS_GENERIC, "klog_subsys_drop");
char buf[1024];
int n = klog_read_consume(buf, sizeof(buf) - 1);
klog_set_subsys_mask(all_mask);
if (n <= 0) {
return false;
}
buf[n] = '\0';
return strstr(buf, "klog_subsys_ok") && !strstr(buf, "klog_subsys_drop");
}
static bool test_ratelimit()
{
KlogRateLimit rl = {};
rl.interval = 100;
rl.burst = 2;
bool a = klog_ratelimit(&rl, 10);
bool b = klog_ratelimit(&rl, 20);
bool c = klog_ratelimit(&rl, 30);
if (!a || !b || c) {
return false;
}
if (rl.printed != 2 || rl.suppressed != 1) {
return false;
}
bool d = klog_ratelimit(&rl, 200);
if (!d) {
return false;
}
return rl.printed == 1 && rl.suppressed == 0;
}
static bool test_flush_advances_console_tail()
{
drain_klog();
klog_set_level(KLOG_ERR);
klog_ex(KLOG_INFO, KLOG_SUBSYS_TEST, "klog_flush_msg");
KlogStats s1;
klog_stats(&s1);
if (s1.console_tail == s1.head) {
klog_set_level(static_cast<KlogLevel>(KLOG_DEFAULT_LEVEL));
return false;
}
klog_flush();
KlogStats s2;
klog_stats(&s2);
klog_set_level(static_cast<KlogLevel>(KLOG_DEFAULT_LEVEL));
return s2.console_tail == s2.head;
}
static bool test_seq_increments()
{
drain_klog();
KlogStats s0;
klog_stats(&s0);
klog_ex(KLOG_INFO, KLOG_SUBSYS_TEST, "klog_seq_1");
klog_ex(KLOG_INFO, KLOG_SUBSYS_TEST, "klog_seq_2");
KlogStats s1;
klog_stats(&s1);
return s1.seq >= s0.seq + 2;
}
void selftest_klog()
{
st_begin("klog: read vs read_consume");
ST_ASSERT(test_read_peek_and_consume());
st_pass();
st_begin("klog: subsys mask filters");
ST_ASSERT(test_subsys_mask());
st_pass();
st_begin("klog: ratelimit bookkeeping");
ST_ASSERT(test_ratelimit());
st_pass();
st_begin("klog: flush advances console tail");
ST_ASSERT(test_flush_advances_console_tail());
st_pass();
st_begin("klog: seq increments on write");
ST_ASSERT(test_seq_increments());
st_pass();
}
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