118 lines
3.0 KiB
Bash
Executable File
118 lines
3.0 KiB
Bash
Executable File
#!/bin/bash
|
|
# SPDX-License-Identifier: GPL-2.0
|
|
#
|
|
# Copyright (C) 2022 Adam Sindelar (Meta) <adam@wowsignal.io>
|
|
#
|
|
# This is a test for mmap behavior with 5-level paging. This script wraps the
|
|
# real test to check that the kernel is configured to support at least 5
|
|
# pagetable levels.
|
|
|
|
# Kselftest framework requirement - SKIP code is 4.
|
|
ksft_skip=4
|
|
orig_nr_hugepages=0
|
|
|
|
skip()
|
|
{
|
|
echo "$1"
|
|
exit $ksft_skip
|
|
}
|
|
|
|
check_supported_x86_64()
|
|
{
|
|
local config="/proc/config.gz"
|
|
[[ -f "${config}" ]] || config="/boot/config-$(uname -r)"
|
|
[[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot"
|
|
|
|
# gzip -dcfq automatically handles both compressed and plaintext input.
|
|
# See man 1 gzip under '-f'.
|
|
local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2)
|
|
|
|
local cpu_supports_pl5=$(awk '/^flags/ {if (/la57/) {print 0;}
|
|
else {print 1}; exit}' /proc/cpuinfo 2>/dev/null)
|
|
|
|
if [[ "${pg_table_levels}" -lt 5 ]]; then
|
|
skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
|
|
elif [[ "${cpu_supports_pl5}" -ne 0 ]]; then
|
|
skip "$0: CPU does not have the necessary la57 flag to support page table level 5"
|
|
fi
|
|
}
|
|
|
|
check_supported_ppc64()
|
|
{
|
|
local config="/proc/config.gz"
|
|
[[ -f "${config}" ]] || config="/boot/config-$(uname -r)"
|
|
[[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot"
|
|
|
|
local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2)
|
|
if [[ "${pg_table_levels}" -lt 5 ]]; then
|
|
skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
|
|
fi
|
|
|
|
local mmu_support=$(grep -m1 "mmu" /proc/cpuinfo | awk '{print $3}')
|
|
if [[ "$mmu_support" != "radix" ]]; then
|
|
skip "$0: System does not use Radix MMU, required for 5-level paging"
|
|
fi
|
|
|
|
local hugepages_total=$(awk '/HugePages_Total/ {print $2}' /proc/meminfo)
|
|
if [[ "${hugepages_total}" -eq 0 ]]; then
|
|
skip "$0: HugePages are not enabled, required for some tests"
|
|
fi
|
|
}
|
|
|
|
check_test_requirements()
|
|
{
|
|
# The test supports x86_64 and powerpc64. We currently have no useful
|
|
# eligibility check for powerpc64, and the test itself will reject other
|
|
# architectures.
|
|
case `uname -m` in
|
|
"x86_64")
|
|
check_supported_x86_64
|
|
;;
|
|
"ppc64le"|"ppc64")
|
|
check_supported_ppc64
|
|
;;
|
|
*)
|
|
return 0
|
|
;;
|
|
esac
|
|
}
|
|
|
|
save_nr_hugepages()
|
|
{
|
|
orig_nr_hugepages=$(cat /proc/sys/vm/nr_hugepages)
|
|
}
|
|
|
|
restore_nr_hugepages()
|
|
{
|
|
echo "$orig_nr_hugepages" > /proc/sys/vm/nr_hugepages
|
|
}
|
|
|
|
setup_nr_hugepages()
|
|
{
|
|
local needpgs=$1
|
|
while read -r name size unit; do
|
|
if [ "$name" = "HugePages_Free:" ]; then
|
|
freepgs="$size"
|
|
break
|
|
fi
|
|
done < /proc/meminfo
|
|
if [ "$freepgs" -ge "$needpgs" ]; then
|
|
return
|
|
fi
|
|
local hpgs=$((orig_nr_hugepages + needpgs))
|
|
echo $hpgs > /proc/sys/vm/nr_hugepages
|
|
|
|
local nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages)
|
|
if [ "$nr_hugepgs" != "$hpgs" ]; then
|
|
restore_nr_hugepages
|
|
skip "$0: no enough hugepages for testing"
|
|
fi
|
|
}
|
|
|
|
check_test_requirements
|
|
save_nr_hugepages
|
|
# 4 keep_mapped pages, and one for tmp usage
|
|
setup_nr_hugepages 5
|
|
./va_high_addr_switch --run-hugetlb
|
|
restore_nr_hugepages
|