Commit 21fad630 authored by Miroslav Lichvar's avatar Miroslav Lichvar Committed by David S. Miller
Browse files

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: default avatarMiroslav Lichvar <mlichvar@redhat.com>
Acked-by: default avatarRichard Cochran <richardcochran@gmail.com>
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f0067ebf

drivers/ptp/ptp_vclock.c

+24 −0
Original line number Diff line number Diff line
@@ -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",