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, 220 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-max8907.c b/drivers/rtc/rtc-max8907.c
new file mode 100644
index 000000000..af97140dd
--- /dev/null
+++ b/drivers/rtc/rtc-max8907.c
@@ -0,0 +1,220 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * RTC driver for Maxim MAX8907
+ *
+ * Copyright (c) 2011-2012, NVIDIA Corporation.
+ *
+ * Based on drivers/rtc/rtc-max8925.c,
+ * Copyright (C) 2009-2010 Marvell International Ltd.
+ */
+
+#include <linux/bcd.h>
+#include <linux/mfd/max8907.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+
+enum {
+	RTC_SEC = 0,
+	RTC_MIN,
+	RTC_HOUR,
+	RTC_WEEKDAY,
+	RTC_DATE,
+	RTC_MONTH,
+	RTC_YEAR1,
+	RTC_YEAR2,
+};
+
+#define TIME_NUM			8
+#define ALARM_1SEC			(1 << 7)
+#define HOUR_12				(1 << 7)
+#define HOUR_AM_PM			(1 << 5)
+#define ALARM0_IRQ			(1 << 3)
+#define ALARM1_IRQ			(1 << 2)
+#define ALARM0_STATUS			(1 << 2)
+#define ALARM1_STATUS			(1 << 1)
+
+struct max8907_rtc {
+	struct max8907		*max8907;
+	struct regmap		*regmap;
+	struct rtc_device	*rtc_dev;
+	int			irq;
+};
+
+static irqreturn_t max8907_irq_handler(int irq, void *data)
+{
+	struct max8907_rtc *rtc = data;
+
+	regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);
+
+	rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
+
+	return IRQ_HANDLED;
+}
+
+static void regs_to_tm(u8 *regs, struct rtc_time *tm)
+{
+	tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 +
+		bcd2bin(regs[RTC_YEAR1]) - 1900;
+	tm->tm_mon = bcd2bin(regs[RTC_MONTH] & 0x1f) - 1;
+	tm->tm_mday = bcd2bin(regs[RTC_DATE] & 0x3f);
+	tm->tm_wday = (regs[RTC_WEEKDAY] & 0x07);
+	if (regs[RTC_HOUR] & HOUR_12) {
+		tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x01f);
+		if (tm->tm_hour == 12)
+			tm->tm_hour = 0;
+		if (regs[RTC_HOUR] & HOUR_AM_PM)
+			tm->tm_hour += 12;
+	} else {
+		tm->tm_hour = bcd2bin(regs[RTC_HOUR] & 0x03f);
+	}
+	tm->tm_min = bcd2bin(regs[RTC_MIN] & 0x7f);
+	tm->tm_sec = bcd2bin(regs[RTC_SEC] & 0x7f);
+}
+
+static void tm_to_regs(struct rtc_time *tm, u8 *regs)
+{
+	u8 high, low;
+
+	high = (tm->tm_year + 1900) / 100;
+	low = tm->tm_year % 100;
+	regs[RTC_YEAR2] = bin2bcd(high);
+	regs[RTC_YEAR1] = bin2bcd(low);
+	regs[RTC_MONTH] = bin2bcd(tm->tm_mon + 1);
+	regs[RTC_DATE] = bin2bcd(tm->tm_mday);
+	regs[RTC_WEEKDAY] = tm->tm_wday;
+	regs[RTC_HOUR] = bin2bcd(tm->tm_hour);
+	regs[RTC_MIN] = bin2bcd(tm->tm_min);
+	regs[RTC_SEC] = bin2bcd(tm->tm_sec);
+}
+
+static int max8907_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct max8907_rtc *rtc = dev_get_drvdata(dev);
+	u8 regs[TIME_NUM];
+	int ret;
+
+	ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
+			       TIME_NUM);
+	if (ret < 0)
+		return ret;
+
+	regs_to_tm(regs, tm);
+
+	return 0;
+}
+
+static int max8907_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct max8907_rtc *rtc = dev_get_drvdata(dev);
+	u8 regs[TIME_NUM];
+
+	tm_to_regs(tm, regs);
+
+	return regmap_bulk_write(rtc->regmap, MAX8907_REG_RTC_SEC, regs,
+				 TIME_NUM);
+}
+
+static int max8907_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct max8907_rtc *rtc = dev_get_drvdata(dev);
+	u8 regs[TIME_NUM];
+	unsigned int val;
+	int ret;
+
+	ret = regmap_bulk_read(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
+			       TIME_NUM);
+	if (ret < 0)
+		return ret;
+
+	regs_to_tm(regs, &alrm->time);
+
+	ret = regmap_read(rtc->regmap, MAX8907_REG_ALARM0_CNTL, &val);
+	if (ret < 0)
+		return ret;
+
+	alrm->enabled = !!(val & 0x7f);
+
+	return 0;
+}
+
+static int max8907_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct max8907_rtc *rtc = dev_get_drvdata(dev);
+	u8 regs[TIME_NUM];
+	int ret;
+
+	tm_to_regs(&alrm->time, regs);
+
+	/* Disable alarm while we update the target time */
+	ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = regmap_bulk_write(rtc->regmap, MAX8907_REG_ALARM0_SEC, regs,
+				TIME_NUM);
+	if (ret < 0)
+		return ret;
+
+	if (alrm->enabled)
+		ret = regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0x77);
+
+	return ret;
+}
+
+static const struct rtc_class_ops max8907_rtc_ops = {
+	.read_time	= max8907_rtc_read_time,
+	.set_time	= max8907_rtc_set_time,
+	.read_alarm	= max8907_rtc_read_alarm,
+	.set_alarm	= max8907_rtc_set_alarm,
+};
+
+static int max8907_rtc_probe(struct platform_device *pdev)
+{
+	struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent);
+	struct max8907_rtc *rtc;
+	int ret;
+
+	rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
+	if (!rtc)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, rtc);
+
+	rtc->max8907 = max8907;
+	rtc->regmap = max8907->regmap_rtc;
+
+	rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, "max8907-rtc",
+					&max8907_rtc_ops, THIS_MODULE);
+	if (IS_ERR(rtc->rtc_dev)) {
+		ret = PTR_ERR(rtc->rtc_dev);
+		dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
+		return ret;
+	}
+
+	rtc->irq = regmap_irq_get_virq(max8907->irqc_rtc,
+				       MAX8907_IRQ_RTC_ALARM0);
+	if (rtc->irq < 0)
+		return rtc->irq;
+
+	ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
+				max8907_irq_handler,
+				IRQF_ONESHOT, "max8907-alarm0", rtc);
+	if (ret < 0)
+		dev_err(&pdev->dev, "Failed to request IRQ%d: %d\n",
+			rtc->irq, ret);
+
+	return ret;
+}
+
+static struct platform_driver max8907_rtc_driver = {
+	.driver = {
+		.name = "max8907-rtc",
+	},
+	.probe = max8907_rtc_probe,
+};
+module_platform_driver(max8907_rtc_driver);
+
+MODULE_DESCRIPTION("Maxim MAX8907 RTC driver");
+MODULE_LICENSE("GPL v2");