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, 124 insertions, 0 deletions

diff --git a/tools/perf/util/parse-regs-options.c b/tools/perf/util/parse-regs-options.c
new file mode 100644
index 000000000..c93c2f0c8
--- /dev/null
+++ b/tools/perf/util/parse-regs-options.c
@@ -0,0 +1,124 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+#include "util/debug.h"
+#include <dwarf-regs.h>
+#include <subcmd/parse-options.h>
+#include "util/perf_regs.h"
+#include "util/parse-regs-options.h"
+
+static void list_perf_regs(FILE *fp, uint64_t mask)
+{
+	const char *last_name = NULL;
+
+	fprintf(fp, "available registers: ");
+	for (int reg = 0; reg < 64; reg++) {
+		const char *name;
+
+		if (((1ULL << reg) & mask) == 0)
+			continue;
+
+		name = perf_reg_name(reg, EM_HOST, EF_HOST);
+		if (name && (!last_name || strcmp(last_name, name)))
+			fprintf(fp, "%s%s", reg > 0 ? " " : "", name);
+		last_name = name;
+	}
+	fputc('\n', fp);
+}
+
+static uint64_t name_to_perf_reg_mask(const char *to_match, uint64_t mask)
+{
+	uint64_t reg_mask = 0;
+
+	for (int reg = 0; reg < 64; reg++) {
+		const char *name;
+
+		if (((1ULL << reg) & mask) == 0)
+			continue;
+
+		name = perf_reg_name(reg, EM_HOST, EF_HOST);
+		if (!name)
+			continue;
+
+		if (!strcasecmp(to_match, name))
+			reg_mask |= 1ULL << reg;
+	}
+	return reg_mask;
+}
+
+static int
+__parse_regs(const struct option *opt, const char *str, int unset, bool intr)
+{
+	uint64_t *mode = (uint64_t *)opt->value;
+	char *s, *os = NULL, *p;
+	int ret = -1;
+	uint64_t mask;
+
+	if (unset)
+		return 0;
+
+	/*
+	 * cannot set it twice
+	 */
+	if (*mode)
+		return -1;
+
+	mask = intr ? perf_intr_reg_mask(EM_HOST) : perf_user_reg_mask(EM_HOST);
+
+	/* str may be NULL in case no arg is passed to -I */
+	if (!str) {
+		*mode = mask;
+		return 0;
+	}
+
+	/* because str is read-only */
+	s = os = strdup(str);
+	if (!s)
+		return -1;
+
+	for (;;) {
+		uint64_t reg_mask;
+
+		p = strchr(s, ',');
+		if (p)
+			*p = '\0';
+
+		if (!strcmp(s, "?")) {
+			list_perf_regs(stderr, mask);
+			goto error;
+		}
+
+		reg_mask = name_to_perf_reg_mask(s, mask);
+		if (reg_mask == 0) {
+			ui__warning("Unknown register \"%s\", check man page or run \"perf record %s?\"\n",
+				s, intr ? "-I" : "--user-regs=");
+			goto error;
+		}
+		*mode |= reg_mask;
+
+		if (!p)
+			break;
+
+		s = p + 1;
+	}
+	ret = 0;
+
+error:
+	free(os);
+	return ret;
+}
+
+int
+parse_user_regs(const struct option *opt, const char *str, int unset)
+{
+	return __parse_regs(opt, str, unset, false);
+}
+
+int
+parse_intr_regs(const struct option *opt, const char *str, int unset)
+{
+	return __parse_regs(opt, str, unset, true);
+}