diff options
| author | Miroslav Lichvar <mlichvar@redhat.com> | 2022-02-02 10:33:58 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-02-03 14:00:58 +0000 |
| commit | 21fad63084c22128169eca1b9d1136eabb8cd290 (patch) | |
| tree | f610694aeb1785f0d0c306c99e0c10372531e950 /drivers/ptp | |
| parent | f0067ebfc42b0f5bb5472fca9fcd4d4fa87a08c0 (diff) | |
| download | linux-21fad63084c22128169eca1b9d1136eabb8cd290.tar.bz2 | |
ptp: add getcrosststamp() to virtual clocks.
If the physical clock supports cross timestamping (it has the
getcrosststamp() function), provide a wrapper in the virtual clock to
enable cross timestamping.
This adds support for the PTP_SYS_OFFSET_PRECISE ioctl.
Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ptp')
| -rw-r--r-- | drivers/ptp/ptp_vclock.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c index 2f0b46386176..cb179a3ea508 100644 --- a/drivers/ptp/ptp_vclock.c +++ b/drivers/ptp/ptp_vclock.c @@ -95,6 +95,28 @@ static int ptp_vclock_settime(struct ptp_clock_info *ptp, return 0; } +static int ptp_vclock_getcrosststamp(struct ptp_clock_info *ptp, + struct system_device_crosststamp *xtstamp) +{ + struct ptp_vclock *vclock = info_to_vclock(ptp); + struct ptp_clock *pptp = vclock->pclock; + unsigned long flags; + int err; + u64 ns; + + err = pptp->info->getcrosststamp(pptp->info, xtstamp); + if (err) + return err; + + spin_lock_irqsave(&vclock->lock, flags); + ns = timecounter_cyc2time(&vclock->tc, ktime_to_ns(xtstamp->device)); + spin_unlock_irqrestore(&vclock->lock, flags); + + xtstamp->device = ns_to_ktime(ns); + + return 0; +} + static long ptp_vclock_refresh(struct ptp_clock_info *ptp) { struct ptp_vclock *vclock = info_to_vclock(ptp); @@ -150,6 +172,8 @@ struct ptp_vclock *ptp_vclock_register(struct ptp_clock *pclock) vclock->info.gettimex64 = ptp_vclock_gettimex; else vclock->info.gettime64 = ptp_vclock_gettime; + if (pclock->info->getcrosststamp) + vclock->info.getcrosststamp = ptp_vclock_getcrosststamp; vclock->cc = ptp_vclock_cc; snprintf(vclock->info.name, PTP_CLOCK_NAME_LEN, "ptp%d_virt", |