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// SPDX-License-Identifier: GPL-2.0-only
/*
* tools/testing/selftests/kvm/lib/test_util.c
*
* Copyright (C) 2020, Google LLC.
*/
#include <assert.h>
#include <ctype.h>
#include <limits.h>
#include <stdlib.h>
#include <time.h>
#include <sys/stat.h>
#include "linux/kernel.h"
#include "test_util.h"
/*
* Parses "[0-9]+[kmgt]?".
*/
size_t parse_size(const char *size)
{
size_t base;
char *scale;
int shift = 0;
TEST_ASSERT(size && isdigit(size[0]), "Need at least one digit in '%s'", size);
base = strtoull(size, &scale, 0);
TEST_ASSERT(base != ULLONG_MAX, "Overflow parsing size!");
switch (tolower(*scale)) {
case 't':
shift = 40;
break;
case 'g':
shift = 30;
break;
case 'm':
shift = 20;
break;
case 'k':
shift = 10;
break;
case 'b':
case '\0':
shift = 0;
break;
default:
TEST_ASSERT(false, "Unknown size letter %c", *scale);
}
TEST_ASSERT((base << shift) >> shift == base, "Overflow scaling size!");
return base << shift;
}
int64_t timespec_to_ns(struct timespec ts)
{
return (int64_t)ts.tv_nsec + 1000000000LL * (int64_t)ts.tv_sec;
}
struct timespec timespec_add_ns(struct timespec ts, int64_t ns)
{
struct timespec res;
res.tv_nsec = ts.tv_nsec + ns;
res.tv_sec = ts.tv_sec + res.tv_nsec / 1000000000LL;
res.tv_nsec %= 1000000000LL;
return res;
}
struct timespec timespec_add(struct timespec ts1, struct timespec ts2)
{
int64_t ns1 = timespec_to_ns(ts1);
int64_t ns2 = timespec_to_ns(ts2);
return timespec_add_ns((struct timespec){0}, ns1 + ns2);
}
struct timespec timespec_sub(struct timespec ts1, struct timespec ts2)
{
int64_t ns1 = timespec_to_ns(ts1);
int64_t ns2 = timespec_to_ns(ts2);
return timespec_add_ns((struct timespec){0}, ns1 - ns2);
}
struct timespec timespec_elapsed(struct timespec start)
{
struct timespec end;
clock_gettime(CLOCK_MONOTONIC, &end);
return timespec_sub(end, start);
}
struct timespec timespec_div(struct timespec ts, int divisor)
{
int64_t ns = timespec_to_ns(ts) / divisor;
return timespec_add_ns((struct timespec){0}, ns);
}
void print_skip(const char *fmt, ...)
{
va_list ap;
assert(fmt);
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
puts(", skipping test");
}
const struct vm_mem_backing_src_alias backing_src_aliases[] = {
{"anonymous", VM_MEM_SRC_ANONYMOUS,},
{"anonymous_thp", VM_MEM_SRC_ANONYMOUS_THP,},
{"anonymous_hugetlb", VM_MEM_SRC_ANONYMOUS_HUGETLB,},
};
bool thp_configured(void)
{
int ret;
struct stat statbuf;
ret = stat("/sys/kernel/mm/transparent_hugepage", &statbuf);
TEST_ASSERT(ret == 0 || (ret == -1 && errno == ENOENT),
"Error in stating /sys/kernel/mm/transparent_hugepage");
return ret == 0;
}
size_t get_trans_hugepagesz(void)
{
size_t size;
FILE *f;
TEST_ASSERT(thp_configured(), "THP is not configured in host kernel");
f = fopen("/sys/kernel/mm/transparent_hugepage/hpage_pmd_size", "r");
TEST_ASSERT(f != NULL, "Error in opening transparent_hugepage/hpage_pmd_size");
fscanf(f, "%ld", &size);
fclose(f);
return size;
}
size_t get_def_hugetlb_pagesz(void)
{
char buf[64];
const char *tag = "Hugepagesize:";
FILE *f;
f = fopen("/proc/meminfo", "r");
TEST_ASSERT(f != NULL, "Error in opening /proc/meminfo");
while (fgets(buf, sizeof(buf), f) != NULL) {
if (strstr(buf, tag) == buf) {
fclose(f);
return strtoull(buf + strlen(tag), NULL, 10) << 10;
}
}
if (feof(f))
TEST_FAIL("HUGETLB is not configured in host kernel");
else
TEST_FAIL("Error in reading /proc/meminfo");
fclose(f);
return 0;
}
void backing_src_help(void)
{
int i;
printf("Available backing src types:\n");
for (i = 0; i < ARRAY_SIZE(backing_src_aliases); i++)
printf("\t%s\n", backing_src_aliases[i].name);
}
enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name)
{
int i;
for (i = 0; i < ARRAY_SIZE(backing_src_aliases); i++)
if (!strcmp(type_name, backing_src_aliases[i].name))
return backing_src_aliases[i].type;
backing_src_help();
TEST_FAIL("Unknown backing src type: %s", type_name);
return -1;
}
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