Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 179 insertions, 0 deletions

diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
new file mode 100644
index 0000000000..0d425f2658
--- /dev/null
+++ b/tools/testing/selftests/resctrl/fill_buf.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * fill_buf benchmark
+ *
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * Authors:
+ *    Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
+ *    Fenghua Yu <fenghua.yu@intel.com>
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <inttypes.h>
+#include <string.h>
+
+#include "resctrl.h"
+
+#define CL_SIZE			(64)
+#define PAGE_SIZE		(4 * 1024)
+#define MB			(1024 * 1024)
+
+static void sb(void)
+{
+#if defined(__i386) || defined(__x86_64)
+	asm volatile("sfence\n\t"
+		     : : : "memory");
+#endif
+}
+
+static void cl_flush(void *p)
+{
+#if defined(__i386) || defined(__x86_64)
+	asm volatile("clflush (%0)\n\t"
+		     : : "r"(p) : "memory");
+#endif
+}
+
+static void mem_flush(unsigned char *buf, size_t buf_size)
+{
+	unsigned char *cp = buf;
+	size_t i = 0;
+
+	buf_size = buf_size / CL_SIZE; /* mem size in cache lines */
+
+	for (i = 0; i < buf_size; i++)
+		cl_flush(&cp[i * CL_SIZE]);
+
+	sb();
+}
+
+static void *malloc_and_init_memory(size_t buf_size)
+{
+	void *p = NULL;
+	uint64_t *p64;
+	size_t s64;
+	int ret;
+
+	ret = posix_memalign(&p, PAGE_SIZE, buf_size);
+	if (ret < 0)
+		return NULL;
+
+	p64 = (uint64_t *)p;
+	s64 = buf_size / sizeof(uint64_t);
+
+	while (s64 > 0) {
+		*p64 = (uint64_t)rand();
+		p64 += (CL_SIZE / sizeof(uint64_t));
+		s64 -= (CL_SIZE / sizeof(uint64_t));
+	}
+
+	return p;
+}
+
+static int fill_one_span_read(unsigned char *buf, size_t buf_size)
+{
+	unsigned char *end_ptr = buf + buf_size;
+	unsigned char sum, *p;
+
+	sum = 0;
+	p = buf;
+	while (p < end_ptr) {
+		sum += *p;
+		p += (CL_SIZE / 2);
+	}
+
+	return sum;
+}
+
+static void fill_one_span_write(unsigned char *buf, size_t buf_size)
+{
+	unsigned char *end_ptr = buf + buf_size;
+	unsigned char *p;
+
+	p = buf;
+	while (p < end_ptr) {
+		*p = '1';
+		p += (CL_SIZE / 2);
+	}
+}
+
+static int fill_cache_read(unsigned char *buf, size_t buf_size, bool once)
+{
+	int ret = 0;
+	FILE *fp;
+
+	while (1) {
+		ret = fill_one_span_read(buf, buf_size);
+		if (once)
+			break;
+	}
+
+	/* Consume read result so that reading memory is not optimized out. */
+	fp = fopen("/dev/null", "w");
+	if (!fp) {
+		perror("Unable to write to /dev/null");
+		return -1;
+	}
+	fprintf(fp, "Sum: %d ", ret);
+	fclose(fp);
+
+	return 0;
+}
+
+static int fill_cache_write(unsigned char *buf, size_t buf_size, bool once)
+{
+	while (1) {
+		fill_one_span_write(buf, buf_size);
+		if (once)
+			break;
+	}
+
+	return 0;
+}
+
+static int fill_cache(size_t buf_size, int memflush, int op, bool once)
+{
+	unsigned char *buf;
+	int ret;
+
+	buf = malloc_and_init_memory(buf_size);
+	if (!buf)
+		return -1;
+
+	/* Flush the memory before using to avoid "cache hot pages" effect */
+	if (memflush)
+		mem_flush(buf, buf_size);
+
+	if (op == 0)
+		ret = fill_cache_read(buf, buf_size, once);
+	else
+		ret = fill_cache_write(buf, buf_size, once);
+
+	free(buf);
+
+	if (ret) {
+		printf("\n Error in fill cache read/write...\n");
+		return -1;
+	}
+
+
+	return 0;
+}
+
+int run_fill_buf(size_t span, int memflush, int op, bool once)
+{
+	size_t cache_size = span;
+	int ret;
+
+	ret = fill_cache(cache_size, memflush, op, once);
+	if (ret) {
+		printf("\n Error in fill cache\n");
+		return -1;
+	}
+
+	return 0;
+}