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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
committed by Moyano, Gabriel
parent c3fc52ec06
commit 2cf37001fc
1 changed files with 18 additions and 5 deletions
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21
cpukit/score/src/kern_tc.c
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@@ -273,6 +273,7 @@ SYSCTL_PROC(_kern_timecounter, OID_AUTO, alloweddeviation,
volatile int rtc_generation = 1; volatile int rtc_generation = 1;
static int tc_chosen; /* Non-zero if a specific tc was chosen via sysctl. */ static int tc_chosen; /* Non-zero if a specific tc was chosen via sysctl. */
static char tc_from_tunable[16];
#endif /* __rtems__ */ #endif /* __rtems__ */
static void tc_windup(struct bintime *new_boottimebin); static void tc_windup(struct bintime *new_boottimebin);
@@ -1383,17 +1384,26 @@ tc_init(struct timecounter *tc)
return; return;
if (tc->tc_quality < 0) if (tc->tc_quality < 0)
return; return;
#endif /* __rtems__ */ 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) if (tc->tc_quality < timecounter->tc_quality)
return; return;
if (tc->tc_quality == timecounter->tc_quality && if (tc->tc_quality == timecounter->tc_quality &&
tc->tc_frequency < timecounter->tc_frequency) tc->tc_frequency < timecounter->tc_frequency)
return; return;
#ifndef __rtems__ }
(void)tc->tc_get_timecount(tc); (void)tc->tc_get_timecount(tc);
#endif /* __rtems__ */
timecounter = tc; timecounter = tc;
#ifdef __rtems__ #else /* __rtems__ */
if (tc->tc_quality < timecounter->tc_quality)
return;
if (tc->tc_quality == timecounter->tc_quality &&
tc->tc_frequency < timecounter->tc_frequency)
return;
timecounter = tc;
tc_windup(NULL); tc_windup(NULL);
#endif /* __rtems__ */ #endif /* __rtems__ */
} }
@@ -2224,6 +2234,9 @@ inittimehands(void *dummy)
for (i = 1, thp = &ths[0]; i < timehands_count; thp = &ths[i++]) for (i = 1, thp = &ths[0]; i < timehands_count; thp = &ths[i++])
thp->th_next = &ths[i]; thp->th_next = &ths[i];
thp->th_next = &ths[0]; 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); SYSINIT(timehands, SI_SUB_TUNABLES, SI_ORDER_ANY, inittimehands, NULL);