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, 272 insertions, 0 deletions

diff --git a/tools/virtio/virtio-trace/trace-agent.c b/tools/virtio/virtio-trace/trace-agent.c
new file mode 100644
index 000000000..7e2d9bbf0
--- /dev/null
+++ b/tools/virtio/virtio-trace/trace-agent.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Guest agent for virtio-trace
+ *
+ * Copyright (C) 2012 Hitachi, Ltd.
+ * Created by Yoshihiro Yunomae <yoshihiro.yunomae.ez@hitachi.com>
+ *            Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
+ */
+
+#define _GNU_SOURCE
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "trace-agent.h"
+
+#define PAGE_SIZE		(sysconf(_SC_PAGE_SIZE))
+#define PIPE_DEF_BUFS		16
+#define PIPE_MIN_SIZE		(PAGE_SIZE*PIPE_DEF_BUFS)
+#define PIPE_MAX_SIZE		(1024*1024)
+#define TRACEFS 		"/sys/kernel/tracing"
+#define DEBUGFS 		"/sys/kernel/debug/tracing"
+#define READ_PATH_FMT		"%s/per_cpu/cpu%d/trace_pipe_raw"
+#define WRITE_PATH_FMT		"/dev/virtio-ports/trace-path-cpu%d"
+#define CTL_PATH		"/dev/virtio-ports/agent-ctl-path"
+
+pthread_mutex_t mutex_notify = PTHREAD_MUTEX_INITIALIZER;
+pthread_cond_t cond_wakeup = PTHREAD_COND_INITIALIZER;
+
+static int get_total_cpus(void)
+{
+	int nr_cpus = (int)sysconf(_SC_NPROCESSORS_CONF);
+
+	if (nr_cpus <= 0) {
+		pr_err("Could not read cpus\n");
+		goto error;
+	} else if (nr_cpus > MAX_CPUS) {
+		pr_err("Exceed max cpus(%d)\n", (int)MAX_CPUS);
+		goto error;
+	}
+
+	return nr_cpus;
+
+error:
+	exit(EXIT_FAILURE);
+}
+
+static void *agent_info_new(void)
+{
+	struct agent_info *s;
+	int i;
+
+	s = zalloc(sizeof(struct agent_info));
+	if (s == NULL) {
+		pr_err("agent_info zalloc error\n");
+		exit(EXIT_FAILURE);
+	}
+
+	s->pipe_size = PIPE_INIT;
+	s->use_stdout = false;
+	s->cpus = get_total_cpus();
+	s->ctl_fd = -1;
+
+	/* read/write threads init */
+	for (i = 0; i < s->cpus; i++)
+		s->rw_ti[i] = rw_thread_info_new();
+
+	return s;
+}
+
+static unsigned long parse_size(const char *arg)
+{
+	unsigned long value, round;
+	char *ptr;
+
+	value = strtoul(arg, &ptr, 10);
+	switch (*ptr) {
+	case 'K': case 'k':
+		value <<= 10;
+		break;
+	case 'M': case 'm':
+		value <<= 20;
+		break;
+	default:
+		break;
+	}
+
+	if (value > PIPE_MAX_SIZE) {
+		pr_err("Pipe size must be less than 1MB\n");
+		goto error;
+	} else if (value < PIPE_MIN_SIZE) {
+		pr_err("Pipe size must be over 64KB\n");
+		goto error;
+	}
+
+	/* Align buffer size with page unit */
+	round = value & (PAGE_SIZE - 1);
+	value = value - round;
+
+	return value;
+error:
+	return 0;
+}
+
+static void usage(char const *prg)
+{
+	pr_err("usage: %s [-h] [-o] [-s <size of pipe>]\n", prg);
+}
+
+static const char *make_path(int cpu_num, bool this_is_write_path)
+{
+	int ret;
+	char *buf;
+
+	buf = zalloc(PATH_MAX);
+	if (buf == NULL) {
+		pr_err("Could not allocate buffer\n");
+		goto error;
+	}
+
+	if (this_is_write_path)
+		/* write(output) path */
+		ret = snprintf(buf, PATH_MAX, WRITE_PATH_FMT, cpu_num);
+	else {
+		/* read(input) path */
+		ret = snprintf(buf, PATH_MAX, READ_PATH_FMT, TRACEFS, cpu_num);
+		if (ret > 0 && access(buf, F_OK) != 0)
+			ret = snprintf(buf, PATH_MAX, READ_PATH_FMT, DEBUGFS, cpu_num);
+	}
+
+	if (ret <= 0) {
+		pr_err("Failed to generate %s path(CPU#%d):%d\n",
+			this_is_write_path ? "read" : "write", cpu_num, ret);
+		goto error;
+	}
+
+	return buf;
+
+error:
+	free(buf);
+	return NULL;
+}
+
+static const char *make_input_path(int cpu_num)
+{
+	return make_path(cpu_num, false);
+}
+
+static const char *make_output_path(int cpu_num)
+{
+	return make_path(cpu_num, true);
+}
+
+static void *agent_info_init(struct agent_info *s)
+{
+	int cpu;
+	const char *in_path = NULL;
+	const char *out_path = NULL;
+
+	/* init read/write threads */
+	for (cpu = 0; cpu < s->cpus; cpu++) {
+		/* set read(input) path per read/write thread */
+		in_path = make_input_path(cpu);
+		if (in_path == NULL)
+			goto error;
+
+		/* set write(output) path per read/write thread*/
+		if (!s->use_stdout) {
+			out_path = make_output_path(cpu);
+			if (out_path == NULL)
+				goto error;
+		} else
+			/* stdout mode */
+			pr_debug("stdout mode\n");
+
+		rw_thread_init(cpu, in_path, out_path, s->use_stdout,
+						s->pipe_size, s->rw_ti[cpu]);
+	}
+
+	/* init controller of read/write threads */
+	s->ctl_fd = rw_ctl_init((const char *)CTL_PATH);
+
+	return NULL;
+
+error:
+	exit(EXIT_FAILURE);
+}
+
+static void *parse_args(int argc, char *argv[], struct agent_info *s)
+{
+	int cmd;
+	unsigned long size;
+
+	while ((cmd = getopt(argc, argv, "hos:")) != -1) {
+		switch (cmd) {
+		/* stdout mode */
+		case 'o':
+			s->use_stdout = true;
+			break;
+		/* size of pipe */
+		case 's':
+			size = parse_size(optarg);
+			if (size == 0)
+				goto error;
+			s->pipe_size = size;
+			break;
+		case 'h':
+		default:
+			usage(argv[0]);
+			goto error;
+		}
+	}
+
+	agent_info_init(s);
+
+	return NULL;
+
+error:
+	exit(EXIT_FAILURE);
+}
+
+static void agent_main_loop(struct agent_info *s)
+{
+	int cpu;
+	pthread_t rw_thread_per_cpu[MAX_CPUS];
+
+	/* Start all read/write threads */
+	for (cpu = 0; cpu < s->cpus; cpu++)
+		rw_thread_per_cpu[cpu] = rw_thread_run(s->rw_ti[cpu]);
+
+	rw_ctl_loop(s->ctl_fd);
+
+	/* Finish all read/write threads */
+	for (cpu = 0; cpu < s->cpus; cpu++) {
+		int ret;
+
+		ret = pthread_join(rw_thread_per_cpu[cpu], NULL);
+		if (ret != 0) {
+			pr_err("pthread_join() error:%d (cpu %d)\n", ret, cpu);
+			exit(EXIT_FAILURE);
+		}
+	}
+}
+
+static void agent_info_free(struct agent_info *s)
+{
+	int i;
+
+	close(s->ctl_fd);
+	for (i = 0; i < s->cpus; i++) {
+		close(s->rw_ti[i]->in_fd);
+		close(s->rw_ti[i]->out_fd);
+		close(s->rw_ti[i]->read_pipe);
+		close(s->rw_ti[i]->write_pipe);
+		free(s->rw_ti[i]);
+	}
+	free(s);
+}
+
+int main(int argc, char *argv[])
+{
+	struct agent_info *s = NULL;
+
+	s = agent_info_new();
+	parse_args(argc, argv, s);
+
+	agent_main_loop(s);
+
+	agent_info_free(s);
+
+	return 0;
+}