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Make timehands count selectable at boottime.

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Tested by:	O'Connor, Daniel <darius@dons.net.au>
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D21563

This patch was modified by Sebastian Huber
<sebastian.huber@embedded-brains.de> to adjust it for RTEMS.  See
comment in the patch.
This commit is contained in:
Konstantin Belousov
2019-09-09 11:29:58 +00:00
committed by Moyano, Gabriel
parent a9ce44bf8f
commit 402dafa495
1 changed files with 45 additions and 5 deletions
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50
cpukit/score/src/kern_tc.c
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@@ -167,6 +167,35 @@ struct timehands {
struct timehands *th_next;
};
#ifndef __rtems__
static struct timehands ths[16] = {
[0] = {
.th_counter = &dummy_timecounter,
.th_scale = (uint64_t)-1 / 1000000,
.th_offset = { .sec = 1 },
.th_generation = 1,
},
};
static struct timehands *volatile timehands = &ths[0];
struct timecounter *timecounter = &dummy_timecounter;
static struct timecounter *timecounters = &dummy_timecounter;
int tc_min_ticktock_freq = 1;
#else /* __rtems__ */
/*
* In FreeBSD, the timehands count is a tuning option from two to 16. The
* tuning option was added since it is inexpensive and some FreeBSD users asked
* for it to play around. The default value is two. One system which did not
* work with two timehands was a system with one processor and a specific PPS
* device.
*
* For RTEMS, in uniprocessor configurations, just use one timehand since the
* update is done with interrupt disabled.
*
* In SMP configurations, use a fixed set of two timehands until someone
* reports an issue.
*/
#if defined(RTEMS_SMP)
static struct timehands th0;
static struct timehands th1 = {
@@ -193,10 +222,6 @@ static struct timehands th0 = {
static struct timehands *volatile timehands = &th0;
struct timecounter *timecounter = &dummy_timecounter;
#ifndef __rtems__
static struct timecounter *timecounters = &dummy_timecounter;
int tc_min_ticktock_freq = 1;
#endif /* __rtems__ */
#ifndef __rtems__
@@ -219,6 +244,10 @@ static int timestepwarnings;
SYSCTL_INT(_kern_timecounter, OID_AUTO, stepwarnings, CTLFLAG_RW,
&timestepwarnings, 0, "Log time steps");
static int timehands_count = 2;
SYSCTL_INT(_kern_timecounter, OID_AUTO, timehands_count, CTLFLAG_RDTUN,
&timehands_count, 0, "Count of timehands in rotation");
struct bintime bt_timethreshold;
struct bintime bt_tickthreshold;
sbintime_t sbt_timethreshold;
@@ -2216,8 +2245,9 @@ done:
static void
inittimecounter(void *dummy)
{
struct timehands *thp;
u_int p;
int tick_rate;
int i, tick_rate;
/*
* Set the initial timeout to
@@ -2243,6 +2273,16 @@ inittimecounter(void *dummy)
#ifdef FFCLOCK
ffclock_init();
#endif
/* Set up the requested number of timehands. */
if (timehands_count < 1)
timehands_count = 1;
if (timehands_count > nitems(ths))
timehands_count = nitems(ths);
for (i = 1, thp = &ths[0]; i < timehands_count; thp = &ths[i++])
thp->th_next = &ths[i];
thp->th_next = &ths[0];
/* warm up new timecounter (again) and get rolling. */
(void)timecounter->tc_get_timecount(timecounter);
(void)timecounter->tc_get_timecount(timecounter);