scftorture: Count single_rpc offline failures in statistics outputgrafted

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 174 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-ds1216.c b/drivers/rtc/rtc-ds1216.c
new file mode 100644
index 000000000..7eeb3f359
--- /dev/null
+++ b/drivers/rtc/rtc-ds1216.c
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Dallas DS1216 RTC driver
+ *
+ * Copyright (c) 2007 Thomas Bogendoerfer
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <linux/bcd.h>
+#include <linux/slab.h>
+
+struct ds1216_regs {
+	u8 tsec;
+	u8 sec;
+	u8 min;
+	u8 hour;
+	u8 wday;
+	u8 mday;
+	u8 month;
+	u8 year;
+};
+
+#define DS1216_HOUR_1224	(1 << 7)
+#define DS1216_HOUR_AMPM	(1 << 5)
+
+struct ds1216_priv {
+	struct rtc_device *rtc;
+	void __iomem *ioaddr;
+};
+
+static const u8 magic[] = {
+	0xc5, 0x3a, 0xa3, 0x5c, 0xc5, 0x3a, 0xa3, 0x5c
+};
+
+/*
+ * Read the 64 bit we'd like to have - It a series
+ * of 64 bits showing up in the LSB of the base register.
+ *
+ */
+static void ds1216_read(u8 __iomem *ioaddr, u8 *buf)
+{
+	unsigned char c;
+	int i, j;
+
+	for (i = 0; i < 8; i++) {
+		c = 0;
+		for (j = 0; j < 8; j++)
+			c |= (readb(ioaddr) & 0x1) << j;
+		buf[i] = c;
+	}
+}
+
+static void ds1216_write(u8 __iomem *ioaddr, const u8 *buf)
+{
+	unsigned char c;
+	int i, j;
+
+	for (i = 0; i < 8; i++) {
+		c = buf[i];
+		for (j = 0; j < 8; j++) {
+			writeb(c, ioaddr);
+			c = c >> 1;
+		}
+	}
+}
+
+static void ds1216_switch_ds_to_clock(u8 __iomem *ioaddr)
+{
+	/* Reset magic pointer */
+	readb(ioaddr);
+	/* Write 64 bit magic to DS1216 */
+	ds1216_write(ioaddr, magic);
+}
+
+static int ds1216_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct ds1216_priv *priv = dev_get_drvdata(dev);
+	struct ds1216_regs regs;
+
+	ds1216_switch_ds_to_clock(priv->ioaddr);
+	ds1216_read(priv->ioaddr, (u8 *)&regs);
+
+	tm->tm_sec = bcd2bin(regs.sec);
+	tm->tm_min = bcd2bin(regs.min);
+	if (regs.hour & DS1216_HOUR_1224) {
+		/* AM/PM mode */
+		tm->tm_hour = bcd2bin(regs.hour & 0x1f);
+		if (regs.hour & DS1216_HOUR_AMPM)
+			tm->tm_hour += 12;
+	} else
+		tm->tm_hour = bcd2bin(regs.hour & 0x3f);
+	tm->tm_wday = (regs.wday & 7) - 1;
+	tm->tm_mday = bcd2bin(regs.mday & 0x3f);
+	tm->tm_mon = bcd2bin(regs.month & 0x1f);
+	tm->tm_year = bcd2bin(regs.year);
+	if (tm->tm_year < 70)
+		tm->tm_year += 100;
+
+	return 0;
+}
+
+static int ds1216_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct ds1216_priv *priv = dev_get_drvdata(dev);
+	struct ds1216_regs regs;
+
+	ds1216_switch_ds_to_clock(priv->ioaddr);
+	ds1216_read(priv->ioaddr, (u8 *)&regs);
+
+	regs.tsec = 0; /* clear 0.1 and 0.01 seconds */
+	regs.sec = bin2bcd(tm->tm_sec);
+	regs.min = bin2bcd(tm->tm_min);
+	regs.hour &= DS1216_HOUR_1224;
+	if (regs.hour && tm->tm_hour > 12) {
+		regs.hour |= DS1216_HOUR_AMPM;
+		tm->tm_hour -= 12;
+	}
+	regs.hour |= bin2bcd(tm->tm_hour);
+	regs.wday &= ~7;
+	regs.wday |= tm->tm_wday;
+	regs.mday = bin2bcd(tm->tm_mday);
+	regs.month = bin2bcd(tm->tm_mon);
+	regs.year = bin2bcd(tm->tm_year % 100);
+
+	ds1216_switch_ds_to_clock(priv->ioaddr);
+	ds1216_write(priv->ioaddr, (u8 *)&regs);
+	return 0;
+}
+
+static const struct rtc_class_ops ds1216_rtc_ops = {
+	.read_time	= ds1216_rtc_read_time,
+	.set_time	= ds1216_rtc_set_time,
+};
+
+static int __init ds1216_rtc_probe(struct platform_device *pdev)
+{
+	struct ds1216_priv *priv;
+	u8 dummy[8];
+
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
+	priv->ioaddr = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->ioaddr))
+		return PTR_ERR(priv->ioaddr);
+
+	priv->rtc = devm_rtc_device_register(&pdev->dev, "ds1216",
+					&ds1216_rtc_ops, THIS_MODULE);
+	if (IS_ERR(priv->rtc))
+		return PTR_ERR(priv->rtc);
+
+	/* dummy read to get clock into a known state */
+	ds1216_read(priv->ioaddr, dummy);
+	return 0;
+}
+
+static struct platform_driver ds1216_rtc_platform_driver = {
+	.driver		= {
+		.name	= "rtc-ds1216",
+	},
+};
+
+module_platform_driver_probe(ds1216_rtc_platform_driver, ds1216_rtc_probe);
+
+MODULE_AUTHOR("Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
+MODULE_DESCRIPTION("DS1216 RTC driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rtc-ds1216");