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sys_linux: add support for PTP_SYS_OFFSET_PRECISE

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This is for hardware that can precisely cross timestamp the PHC with the
system clock.
This commit is contained in:
Miroslav Lichvar
2017-01-19 16:05:49 +01:00
parent 9df4d36157
commit 31b6a14444
4 changed files with 41 additions and 5 deletions
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40
sys_linux.c
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@@ -517,6 +517,9 @@ SYS_Linux_EnableSystemCallFilter(int level)
FIONREAD, TCGETS,
#if defined(FEAT_PHC) || defined(HAVE_LINUX_TIMESTAMPING)
PTP_SYS_OFFSET,
#ifdef PTP_SYS_OFFSET_PRECISE
PTP_SYS_OFFSET_PRECISE,
#endif
#endif
#ifdef FEAT_PPS
PPS_FETCH,
@@ -729,6 +732,35 @@ get_phc_sample(int phc_fd, double precision, struct timespec *phc_ts,
return 1;
}
/* ================================================== */
static int
get_precise_phc_sample(int phc_fd, double precision, struct timespec *phc_ts,
struct timespec *sys_ts, double *err)
{
#ifdef PTP_SYS_OFFSET_PRECISE
struct ptp_sys_offset_precise sys_off;
/* Silence valgrind */
memset(&sys_off, 0, sizeof (sys_off));
if (ioctl(phc_fd, PTP_SYS_OFFSET_PRECISE, &sys_off)) {
DEBUG_LOG(LOGF_SysLinux, "ioctl(%s) failed : %s", "PTP_SYS_OFFSET_PRECISE",
strerror(errno));
return 0;
}
phc_ts->tv_sec = sys_off.device.sec;
phc_ts->tv_nsec = sys_off.device.nsec;
sys_ts->tv_sec = sys_off.sys_realtime.sec;
sys_ts->tv_nsec = sys_off.sys_realtime.nsec;
*err = MAX(LCL_GetSysPrecisionAsQuantum(), precision);
return 1;
#else
return 0;
#endif
}
/* ================================================== */
@@ -766,10 +798,14 @@ SYS_Linux_OpenPHC(const char *path, int phc_index)
/* ================================================== */
int
SYS_Linux_GetPHCSample(int fd, double precision, int *reading_mode,
SYS_Linux_GetPHCSample(int fd, int nocrossts, double precision, int *reading_mode,
struct timespec *phc_ts, struct timespec *sys_ts, double *err)
{
if ((*reading_mode == 1 || !*reading_mode) &&
if ((*reading_mode == 2 || !*reading_mode) && !nocrossts &&
get_precise_phc_sample(fd, precision, phc_ts, sys_ts, err)) {
*reading_mode = 2;
return 1;
} else if ((*reading_mode == 1 || !*reading_mode) &&
get_phc_sample(fd, precision, phc_ts, sys_ts, err)) {
*reading_mode = 1;
return 1;