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authorMiroslav Lichvar <mlichvar@redhat.com>2022-02-02 10:33:58 +0100
committerDavid S. Miller <davem@davemloft.net>2022-02-03 14:00:58 +0000
commit21fad63084c22128169eca1b9d1136eabb8cd290 (patch)
treef610694aeb1785f0d0c306c99e0c10372531e950 /drivers/ptp
parentf0067ebfc42b0f5bb5472fca9fcd4d4fa87a08c0 (diff)
downloadlinux-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.c24
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",