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#!/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
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