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Make kern.timecounter.hardware tunable

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Noted and reviewed by:	kevans
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D29122
This commit is contained in:
Konstantin Belousov 2021-03-08 01:50:12 +02:00
parent 38dfb0626f
commit 56b9bee63a
1 changed files with 16 additions and 6 deletions
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22
sys/kern/kern_tc.c
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@ -141,6 +141,7 @@ SYSCTL_PROC(_kern_timecounter, OID_AUTO, alloweddeviation,
volatile int rtc_generation = 1;
static int tc_chosen; /* Non-zero if a specific tc was chosen via sysctl. */
static char tc_from_tunable[16];
static void tc_windup(struct bintime *new_boottimebin);
static void cpu_tick_calibrate(int);
@ -1215,11 +1216,17 @@ tc_init(struct timecounter *tc)
return;
if (tc->tc_quality < 0)
return;
if (tc->tc_quality < timecounter->tc_quality)
return;
if (tc->tc_quality == timecounter->tc_quality &&
tc->tc_frequency < timecounter->tc_frequency)
return;
if (tc_from_tunable[0] != '\0' &&
strcmp(tc->tc_name, tc_from_tunable) == 0) {
tc_chosen = 1;
tc_from_tunable[0] = '\0';
} else {
if (tc->tc_quality < timecounter->tc_quality)
return;
if (tc->tc_quality == timecounter->tc_quality &&
tc->tc_frequency < timecounter->tc_frequency)
return;
}
(void)tc->tc_get_timecount(tc);
timecounter = tc;
}
@ -1500,7 +1507,7 @@ sysctl_kern_timecounter_hardware(SYSCTL_HANDLER_ARGS)
}
SYSCTL_PROC(_kern_timecounter, OID_AUTO, hardware,
CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0,
CTLTYPE_STRING | CTLFLAG_RWTUN | CTLFLAG_NOFETCH | CTLFLAG_MPSAFE, 0, 0,
sysctl_kern_timecounter_hardware, "A",
"Timecounter hardware selected");
@ -1940,6 +1947,9 @@ inittimehands(void *dummy)
for (i = 1, thp = &ths[0]; i < timehands_count; thp = &ths[i++])
thp->th_next = &ths[i];
thp->th_next = &ths[0];
TUNABLE_STR_FETCH("kern.timecounter.hardware", tc_from_tunable,
sizeof(tc_from_tunable));
}
SYSINIT(timehands, SI_SUB_TUNABLES, SI_ORDER_ANY, inittimehands, NULL);