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>

2 files changed, 131 insertions, 0 deletions

diff --git a/samples/tsm-mr/Makefile b/samples/tsm-mr/Makefile
new file mode 100644
index 000000000..587c3947b
--- /dev/null
+++ b/samples/tsm-mr/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_SAMPLE_TSM_MR) += tsm_mr_sample.o
diff --git a/samples/tsm-mr/tsm_mr_sample.c b/samples/tsm-mr/tsm_mr_sample.c
new file mode 100644
index 000000000..c79dbc1e0
--- /dev/null
+++ b/samples/tsm-mr/tsm_mr_sample.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright(c) 2024-2005 Intel Corporation. All rights reserved. */
+
+#define pr_fmt(x) KBUILD_MODNAME ": " x
+
+#include <linux/module.h>
+#include <linux/tsm-mr.h>
+#include <linux/miscdevice.h>
+#include <crypto/sha2.h>
+
+static struct {
+	u8 static_mr[SHA384_DIGEST_SIZE];
+	u8 config_mr[SHA512_DIGEST_SIZE];
+	u8 rtmr0[SHA256_DIGEST_SIZE];
+	u8 rtmr1[SHA384_DIGEST_SIZE];
+	u8 report_digest[SHA512_DIGEST_SIZE];
+} sample_report = {
+	.static_mr = "static_mr",
+	.config_mr = "config_mr",
+	.rtmr0 = "rtmr0",
+	.rtmr1 = "rtmr1",
+};
+
+static int sample_report_refresh(const struct tsm_measurements *tm)
+{
+	sha512((const u8 *)&sample_report,
+	       offsetof(typeof(sample_report), report_digest),
+	       sample_report.report_digest);
+	return 0;
+}
+
+static int sample_report_extend_mr(const struct tsm_measurements *tm,
+				   const struct tsm_measurement_register *mr,
+				   const u8 *data)
+{
+	union {
+		struct sha256_ctx sha256;
+		struct sha384_ctx sha384;
+		struct sha512_ctx sha512;
+	} ctx;
+
+	switch (mr->mr_hash) {
+	case HASH_ALGO_SHA256:
+		sha256_init(&ctx.sha256);
+		sha256_update(&ctx.sha256, mr->mr_value, mr->mr_size);
+		sha256_update(&ctx.sha256, data, mr->mr_size);
+		sha256_final(&ctx.sha256, mr->mr_value);
+		return 0;
+	case HASH_ALGO_SHA384:
+		sha384_init(&ctx.sha384);
+		sha384_update(&ctx.sha384, mr->mr_value, mr->mr_size);
+		sha384_update(&ctx.sha384, data, mr->mr_size);
+		sha384_final(&ctx.sha384, mr->mr_value);
+		return 0;
+	case HASH_ALGO_SHA512:
+		sha512_init(&ctx.sha512);
+		sha512_update(&ctx.sha512, mr->mr_value, mr->mr_size);
+		sha512_update(&ctx.sha512, data, mr->mr_size);
+		sha512_final(&ctx.sha512, mr->mr_value);
+		return 0;
+	default:
+		pr_err("Unsupported hash algorithm: %d\n", mr->mr_hash);
+		return -EOPNOTSUPP;
+	}
+}
+
+#define MR_(mr, hash) .mr_value = &sample_report.mr, TSM_MR_(mr, hash)
+static const struct tsm_measurement_register sample_mrs[] = {
+	/* static MR, read-only */
+	{ MR_(static_mr, SHA384) },
+	/* config MR, read-only */
+	{ MR_(config_mr, SHA512) | TSM_MR_F_NOHASH },
+	/* RTMR, direct extension prohibited */
+	{ MR_(rtmr0, SHA256) | TSM_MR_F_LIVE },
+	/* RTMR, direct extension allowed */
+	{ MR_(rtmr1, SHA384) | TSM_MR_F_RTMR },
+	/* RTMR, crypto agile, alaised to rtmr0 and rtmr1, respectively */
+	{ .mr_value = &sample_report.rtmr0,
+	  TSM_MR_(rtmr_crypto_agile, SHA256) | TSM_MR_F_RTMR },
+	{ .mr_value = &sample_report.rtmr1,
+	  TSM_MR_(rtmr_crypto_agile, SHA384) | TSM_MR_F_RTMR },
+	/* sha512 digest of the whole structure */
+	{ MR_(report_digest, SHA512) | TSM_MR_F_LIVE },
+};
+#undef MR_
+
+static struct tsm_measurements sample_tm = {
+	.mrs = sample_mrs,
+	.nr_mrs = ARRAY_SIZE(sample_mrs),
+	.refresh = sample_report_refresh,
+	.write = sample_report_extend_mr,
+};
+
+static const struct attribute_group *sample_groups[] = {
+	NULL,
+	NULL,
+};
+
+static struct miscdevice sample_misc_dev = {
+	.name = KBUILD_MODNAME,
+	.minor = MISC_DYNAMIC_MINOR,
+	.groups = sample_groups,
+};
+
+static int __init tsm_mr_sample_init(void)
+{
+	int rc;
+
+	sample_groups[0] = tsm_mr_create_attribute_group(&sample_tm);
+	if (IS_ERR(sample_groups[0]))
+		return PTR_ERR(sample_groups[0]);
+
+	rc = misc_register(&sample_misc_dev);
+	if (rc)
+		tsm_mr_free_attribute_group(sample_groups[0]);
+	return rc;
+}
+
+static void __exit tsm_mr_sample_exit(void)
+{
+	misc_deregister(&sample_misc_dev);
+	tsm_mr_free_attribute_group(sample_groups[0]);
+}
+
+module_init(tsm_mr_sample_init);
+module_exit(tsm_mr_sample_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Sample module using tsm-mr to expose emulated MRs");