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, 302 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/resistive-adc-touch.c b/drivers/input/touchscreen/resistive-adc-touch.c
new file mode 100644
index 000000000..68f7e2e28
--- /dev/null
+++ b/drivers/input/touchscreen/resistive-adc-touch.c
@@ -0,0 +1,302 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ADC generic resistive touchscreen (GRTS)
+ * This is a generic input driver that connects to an ADC
+ * given the channels in device tree, and reports events to the input
+ * subsystem.
+ *
+ * Copyright (C) 2017,2018 Microchip Technology,
+ * Author: Eugen Hristev <eugen.hristev@microchip.com>
+ *
+ */
+#include <linux/input.h>
+#include <linux/input/touchscreen.h>
+#include <linux/iio/consumer.h>
+#include <linux/iio/iio.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#define DRIVER_NAME					"resistive-adc-touch"
+#define GRTS_DEFAULT_PRESSURE_MIN			50000
+#define GRTS_DEFAULT_PRESSURE_MAX			65535
+#define GRTS_MAX_POS_MASK				GENMASK(11, 0)
+#define GRTS_MAX_CHANNELS				4
+
+enum grts_ch_type {
+	GRTS_CH_X,
+	GRTS_CH_Y,
+	GRTS_CH_PRESSURE,
+	GRTS_CH_Z1,
+	GRTS_CH_Z2,
+	GRTS_CH_MAX = GRTS_CH_Z2 + 1
+};
+
+/**
+ * struct grts_state - generic resistive touch screen information struct
+ * @x_plate_ohms:	resistance of the X plate
+ * @pressure_min:	number representing the minimum for the pressure
+ * @pressure:		are we getting pressure info or not
+ * @iio_chans:		list of channels acquired
+ * @iio_cb:		iio_callback buffer for the data
+ * @input:		the input device structure that we register
+ * @prop:		touchscreen properties struct
+ * @ch_map:		map of channels that are defined for the touchscreen
+ */
+struct grts_state {
+	u32				x_plate_ohms;
+	u32				pressure_min;
+	bool				pressure;
+	struct iio_channel		*iio_chans;
+	struct iio_cb_buffer		*iio_cb;
+	struct input_dev		*input;
+	struct touchscreen_properties	prop;
+	u8				ch_map[GRTS_CH_MAX];
+};
+
+static int grts_cb(const void *data, void *private)
+{
+	const u16 *touch_info = data;
+	struct grts_state *st = private;
+	unsigned int x, y, press = 0;
+
+	x = touch_info[st->ch_map[GRTS_CH_X]];
+	y = touch_info[st->ch_map[GRTS_CH_Y]];
+
+	if (st->ch_map[GRTS_CH_PRESSURE] < GRTS_MAX_CHANNELS) {
+		press = touch_info[st->ch_map[GRTS_CH_PRESSURE]];
+	} else if (st->ch_map[GRTS_CH_Z1] < GRTS_MAX_CHANNELS) {
+		unsigned int z1 = touch_info[st->ch_map[GRTS_CH_Z1]];
+		unsigned int z2 = touch_info[st->ch_map[GRTS_CH_Z2]];
+		unsigned int Rt;
+
+		if (likely(x && z1)) {
+			Rt = z2;
+			Rt -= z1;
+			Rt *= st->x_plate_ohms;
+			Rt = DIV_ROUND_CLOSEST(Rt, 16);
+			Rt *= x;
+			Rt /= z1;
+			Rt = DIV_ROUND_CLOSEST(Rt, 256);
+			/*
+			 * On increased pressure the resistance (Rt) is
+			 * decreasing so, convert values to make it looks as
+			 * real pressure.
+			 */
+			if (Rt < GRTS_DEFAULT_PRESSURE_MAX)
+				press = GRTS_DEFAULT_PRESSURE_MAX - Rt;
+		}
+	}
+
+	if ((!x && !y) || (st->pressure && (press < st->pressure_min))) {
+		/* report end of touch */
+		input_report_key(st->input, BTN_TOUCH, 0);
+		input_sync(st->input);
+		return 0;
+	}
+
+	/* report proper touch to subsystem*/
+	touchscreen_report_pos(st->input, &st->prop, x, y, false);
+	if (st->pressure)
+		input_report_abs(st->input, ABS_PRESSURE, press);
+	input_report_key(st->input, BTN_TOUCH, 1);
+	input_sync(st->input);
+
+	return 0;
+}
+
+static int grts_open(struct input_dev *dev)
+{
+	int error;
+	struct grts_state *st = input_get_drvdata(dev);
+
+	error = iio_channel_start_all_cb(st->iio_cb);
+	if (error) {
+		dev_err(dev->dev.parent, "failed to start callback buffer.\n");
+		return error;
+	}
+	return 0;
+}
+
+static void grts_close(struct input_dev *dev)
+{
+	struct grts_state *st = input_get_drvdata(dev);
+
+	iio_channel_stop_all_cb(st->iio_cb);
+}
+
+static void grts_disable(void *data)
+{
+	iio_channel_release_all_cb(data);
+}
+
+static int grts_map_channel(struct grts_state *st, struct device *dev,
+			    enum grts_ch_type type, const char *name,
+			    bool optional)
+{
+	int idx;
+
+	idx = device_property_match_string(dev, "io-channel-names", name);
+	if (idx < 0) {
+		if (!optional)
+			return idx;
+		idx = GRTS_MAX_CHANNELS;
+	} else if (idx >= GRTS_MAX_CHANNELS) {
+		return -EOVERFLOW;
+	}
+
+	st->ch_map[type] = idx;
+	return 0;
+}
+
+static int grts_get_properties(struct grts_state *st, struct device *dev)
+{
+	int error;
+
+	error = grts_map_channel(st, dev, GRTS_CH_X, "x", false);
+	if (error)
+		return error;
+
+	error = grts_map_channel(st, dev, GRTS_CH_Y, "y", false);
+	if (error)
+		return error;
+
+	/* pressure is optional */
+	error = grts_map_channel(st, dev, GRTS_CH_PRESSURE, "pressure", true);
+	if (error)
+		return error;
+
+	if (st->ch_map[GRTS_CH_PRESSURE] < GRTS_MAX_CHANNELS) {
+		st->pressure = true;
+		return 0;
+	}
+
+	/* if no pressure is defined, try optional z1 + z2 */
+	error = grts_map_channel(st, dev, GRTS_CH_Z1, "z1", true);
+	if (error)
+		return error;
+
+	if (st->ch_map[GRTS_CH_Z1] >= GRTS_MAX_CHANNELS)
+		return 0;
+
+	/* if z1 is provided z2 is not optional */
+	error = grts_map_channel(st, dev, GRTS_CH_Z2, "z2", true);
+	if (error)
+		return error;
+
+	error = device_property_read_u32(dev,
+					 "touchscreen-x-plate-ohms",
+					 &st->x_plate_ohms);
+	if (error) {
+		dev_err(dev, "can't get touchscreen-x-plate-ohms property\n");
+		return error;
+	}
+
+	st->pressure = true;
+	return 0;
+}
+
+static int grts_probe(struct platform_device *pdev)
+{
+	struct grts_state *st;
+	struct input_dev *input;
+	struct device *dev = &pdev->dev;
+	int error;
+
+	st = devm_kzalloc(dev, sizeof(struct grts_state), GFP_KERNEL);
+	if (!st)
+		return -ENOMEM;
+
+	/* get the channels from IIO device */
+	st->iio_chans = devm_iio_channel_get_all(dev);
+	if (IS_ERR(st->iio_chans))
+		return dev_err_probe(dev, PTR_ERR(st->iio_chans), "can't get iio channels\n");
+
+	if (!device_property_present(dev, "io-channel-names"))
+		return -ENODEV;
+
+	error = grts_get_properties(st, dev);
+	if (error) {
+		dev_err(dev, "Failed to parse properties\n");
+		return error;
+	}
+
+	if (st->pressure) {
+		error = device_property_read_u32(dev,
+						 "touchscreen-min-pressure",
+						 &st->pressure_min);
+		if (error) {
+			dev_dbg(dev, "can't get touchscreen-min-pressure property.\n");
+			st->pressure_min = GRTS_DEFAULT_PRESSURE_MIN;
+		}
+	}
+
+	input = devm_input_allocate_device(dev);
+	if (!input) {
+		dev_err(dev, "failed to allocate input device.\n");
+		return -ENOMEM;
+	}
+
+	input->name = DRIVER_NAME;
+	input->id.bustype = BUS_HOST;
+	input->open = grts_open;
+	input->close = grts_close;
+
+	input_set_abs_params(input, ABS_X, 0, GRTS_MAX_POS_MASK - 1, 0, 0);
+	input_set_abs_params(input, ABS_Y, 0, GRTS_MAX_POS_MASK - 1, 0, 0);
+	if (st->pressure)
+		input_set_abs_params(input, ABS_PRESSURE, st->pressure_min,
+				     GRTS_DEFAULT_PRESSURE_MAX, 0, 0);
+
+	input_set_capability(input, EV_KEY, BTN_TOUCH);
+
+	/* parse optional device tree properties */
+	touchscreen_parse_properties(input, false, &st->prop);
+
+	st->input = input;
+	input_set_drvdata(input, st);
+
+	error = input_register_device(input);
+	if (error) {
+		dev_err(dev, "failed to register input device.");
+		return error;
+	}
+
+	st->iio_cb = iio_channel_get_all_cb(dev, grts_cb, st);
+	if (IS_ERR(st->iio_cb)) {
+		dev_err(dev, "failed to allocate callback buffer.\n");
+		return PTR_ERR(st->iio_cb);
+	}
+
+	error = devm_add_action_or_reset(dev, grts_disable, st->iio_cb);
+	if (error) {
+		dev_err(dev, "failed to add disable action.\n");
+		return error;
+	}
+
+	return 0;
+}
+
+static const struct of_device_id grts_of_match[] = {
+	{
+		.compatible = "resistive-adc-touch",
+	}, {
+		/* sentinel */
+	},
+};
+
+MODULE_DEVICE_TABLE(of, grts_of_match);
+
+static struct platform_driver grts_driver = {
+	.probe = grts_probe,
+	.driver = {
+		.name = DRIVER_NAME,
+		.of_match_table = grts_of_match,
+	},
+};
+
+module_platform_driver(grts_driver);
+
+MODULE_AUTHOR("Eugen Hristev <eugen.hristev@microchip.com>");
+MODULE_DESCRIPTION("Generic ADC Resistive Touch Driver");
+MODULE_LICENSE("GPL v2");