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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2020 ARM Limited
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ucontext.h>
#include <sys/mman.h>
#include "kselftest.h"
#include "mte_common_util.h"
#include "mte_def.h"
#define TEST_UNIT 10
#define PATH_KSM "/sys/kernel/mm/ksm/"
#define MAX_LOOP 4
static size_t page_sz;
static unsigned long ksm_sysfs[5];
static unsigned long read_sysfs(char *str)
{
FILE *f;
unsigned long val = 0;
f = fopen(str, "r");
if (!f) {
ksft_print_msg("ERR: missing %s\n", str);
return 0;
}
fscanf(f, "%lu", &val);
fclose(f);
return val;
}
static void write_sysfs(char *str, unsigned long val)
{
FILE *f;
f = fopen(str, "w");
if (!f) {
ksft_print_msg("ERR: missing %s\n", str);
return;
}
fprintf(f, "%lu", val);
fclose(f);
}
static void mte_ksm_setup(void)
{
ksm_sysfs[0] = read_sysfs(PATH_KSM "merge_across_nodes");
write_sysfs(PATH_KSM "merge_across_nodes", 1);
ksm_sysfs[1] = read_sysfs(PATH_KSM "sleep_millisecs");
write_sysfs(PATH_KSM "sleep_millisecs", 0);
ksm_sysfs[2] = read_sysfs(PATH_KSM "run");
write_sysfs(PATH_KSM "run", 1);
ksm_sysfs[3] = read_sysfs(PATH_KSM "max_page_sharing");
write_sysfs(PATH_KSM "max_page_sharing", ksm_sysfs[3] + TEST_UNIT);
ksm_sysfs[4] = read_sysfs(PATH_KSM "pages_to_scan");
write_sysfs(PATH_KSM "pages_to_scan", ksm_sysfs[4] + TEST_UNIT);
}
static void mte_ksm_restore(void)
{
write_sysfs(PATH_KSM "merge_across_nodes", ksm_sysfs[0]);
write_sysfs(PATH_KSM "sleep_millisecs", ksm_sysfs[1]);
write_sysfs(PATH_KSM "run", ksm_sysfs[2]);
write_sysfs(PATH_KSM "max_page_sharing", ksm_sysfs[3]);
write_sysfs(PATH_KSM "pages_to_scan", ksm_sysfs[4]);
}
static void mte_ksm_scan(void)
{
int cur_count = read_sysfs(PATH_KSM "full_scans");
int scan_count = cur_count + 1;
int max_loop_count = MAX_LOOP;
while ((cur_count < scan_count) && max_loop_count) {
sleep(1);
cur_count = read_sysfs(PATH_KSM "full_scans");
max_loop_count--;
}
#ifdef DEBUG
ksft_print_msg("INFO: pages_shared=%lu pages_sharing=%lu\n",
read_sysfs(PATH_KSM "pages_shared"),
read_sysfs(PATH_KSM "pages_sharing"));
#endif
}
static int check_madvise_options(int mem_type, int mode, int mapping)
{
char *ptr;
int err, ret;
err = KSFT_FAIL;
if (access(PATH_KSM, F_OK) == -1) {
ksft_print_msg("ERR: Kernel KSM config not enabled\n");
return err;
}
mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
ptr = mte_allocate_memory(TEST_UNIT * page_sz, mem_type, mapping, true);
if (check_allocated_memory(ptr, TEST_UNIT * page_sz, mem_type, false) != KSFT_PASS)
return KSFT_FAIL;
/* Insert same data in all the pages */
memset(ptr, 'A', TEST_UNIT * page_sz);
ret = madvise(ptr, TEST_UNIT * page_sz, MADV_MERGEABLE);
if (ret) {
ksft_print_msg("ERR: madvise failed to set MADV_UNMERGEABLE\n");
goto madvise_err;
}
mte_ksm_scan();
/* Tagged pages should not merge */
if ((read_sysfs(PATH_KSM "pages_shared") < 1) ||
(read_sysfs(PATH_KSM "pages_sharing") < (TEST_UNIT - 1)))
err = KSFT_PASS;
madvise_err:
mte_free_memory(ptr, TEST_UNIT * page_sz, mem_type, true);
return err;
}
int main(int argc, char *argv[])
{
int err;
err = mte_default_setup();
if (err)
return err;
page_sz = getpagesize();
if (!page_sz) {
ksft_print_msg("ERR: Unable to get page size\n");
return KSFT_FAIL;
}
/* Register signal handlers */
mte_register_signal(SIGBUS, mte_default_handler);
mte_register_signal(SIGSEGV, mte_default_handler);
/* Enable KSM */
mte_ksm_setup();
evaluate_test(check_madvise_options(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE),
"Check KSM mte page merge for private mapping, sync mode and mmap memory\n");
evaluate_test(check_madvise_options(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE),
"Check KSM mte page merge for private mapping, async mode and mmap memory\n");
evaluate_test(check_madvise_options(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED),
"Check KSM mte page merge for shared mapping, sync mode and mmap memory\n");
evaluate_test(check_madvise_options(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED),
"Check KSM mte page merge for shared mapping, async mode and mmap memory\n");
mte_ksm_restore();
mte_restore_setup();
ksft_print_cnts();
return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;
}
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