Merge branch 'ptp-virtual-clock-improvements'

Miroslav Lichvar says:

====================
Virtual PTP clock improvements and fix

v2:
- dropped patch changing initial time of virtual clocks

The first patch fixes an oops when unloading a driver with PTP clock and
enabled virtual clocks.

The other patches add missing features to make synchronization with
virtual clocks work as well as with the physical clock.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/ptp/ptp_clock.c

@@ -317,11 +317,18 @@ no_memory:
 }
 EXPORT_SYMBOL(ptp_clock_register);
 
+static int unregister_vclock(struct device *dev, void *data)
+{
+	struct ptp_clock *ptp = dev_get_drvdata(dev);
+
+	ptp_vclock_unregister(info_to_vclock(ptp->info));
+	return 0;
+}
+
 int ptp_clock_unregister(struct ptp_clock *ptp)
 {
 	if (ptp_vclock_in_use(ptp)) {
-		pr_err("ptp: virtual clock in use\n");
-		return -EBUSY;
+		device_for_each_child(&ptp->dev, NULL, unregister_vclock);
 	}
 
 	ptp->defunct = 1;

drivers/ptp/ptp_vclock.c

@@ -57,6 +57,30 @@ static int ptp_vclock_gettime(struct ptp_clock_info *ptp,
 	return 0;
 }
 
+static int ptp_vclock_gettimex(struct ptp_clock_info *ptp,
+			       struct timespec64 *ts,
+			       struct ptp_system_timestamp *sts)
+{
+	struct ptp_vclock *vclock = info_to_vclock(ptp);
+	struct ptp_clock *pptp = vclock->pclock;
+	struct timespec64 pts;
+	unsigned long flags;
+	int err;
+	u64 ns;
+
+	err = pptp->info->gettimex64(pptp->info, &pts, sts);
+	if (err)
+		return err;
+
+	spin_lock_irqsave(&vclock->lock, flags);
+	ns = timecounter_cyc2time(&vclock->tc, timespec64_to_ns(&pts));
+	spin_unlock_irqrestore(&vclock->lock, flags);
+
+	*ts = ns_to_timespec64(ns);
+
+	return 0;
+}
+
 static int ptp_vclock_settime(struct ptp_clock_info *ptp,
 			      const struct timespec64 *ts)
 {
@@ -71,6 +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);
@@ -84,11 +130,9 @@ static long ptp_vclock_refresh(struct ptp_clock_info *ptp)
 static const struct ptp_clock_info ptp_vclock_info = {
 	.owner		= THIS_MODULE,
 	.name		= "ptp virtual clock",
-	/* The maximum ppb value that long scaled_ppm can support */
-	.max_adj	= 32767999,
+	.max_adj	= 500000000,
 	.adjfine	= ptp_vclock_adjfine,
 	.adjtime	= ptp_vclock_adjtime,
-	.gettime64	= ptp_vclock_gettime,
 	.settime64	= ptp_vclock_settime,
 	.do_aux_work	= ptp_vclock_refresh,
 };
@@ -124,6 +168,12 @@ struct ptp_vclock *ptp_vclock_register(struct ptp_clock *pclock)
 
 	vclock->pclock = pclock;
 	vclock->info = ptp_vclock_info;
+	if (pclock->info->gettimex64)
+		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",