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ptp: add getcrosststamp() to virtual clocks.

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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>
This commit is contained in:
Miroslav Lichvar 2022-02-02 10:33:58 +01:00 committed by David S. Miller
parent f0067ebfc4
commit 21fad63084
1 changed files with 24 additions and 0 deletions
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24
drivers/ptp/ptp_vclock.c
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@ -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",