61 lines · bash
1#!/bin/bash2# SPDX-License-Identifier: GPL-2.03#4# Copyright (C) 2022 Adam Sindelar (Meta) <adam@wowsignal.io>5#6# This is a test for mmap behavior with 5-level paging. This script wraps the7# real test to check that the kernel is configured to support at least 58# pagetable levels.9 10# 1 means the test failed11exitcode=112 13# Kselftest framework requirement - SKIP code is 4.14ksft_skip=415 16fail()17{18 echo "$1"19 exit $exitcode20}21 22check_supported_x86_64()23{24 local config="/proc/config.gz"25 [[ -f "${config}" ]] || config="/boot/config-$(uname -r)"26 [[ -f "${config}" ]] || fail "Cannot find kernel config in /proc or /boot"27 28 # gzip -dcfq automatically handles both compressed and plaintext input.29 # See man 1 gzip under '-f'.30 local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2)31 32 local cpu_supports_pl5=$(awk '/^flags/ {if (/la57/) {print 0;}33 else {print 1}; exit}' /proc/cpuinfo 2>/dev/null)34 35 if [[ "${pg_table_levels}" -lt 5 ]]; then36 echo "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"37 exit $ksft_skip38 elif [[ "${cpu_supports_pl5}" -ne 0 ]]; then39 echo "$0: CPU does not have the necessary la57 flag to support page table level 5"40 exit $ksft_skip41 fi42}43 44check_test_requirements()45{46 # The test supports x86_64 and powerpc64. We currently have no useful47 # eligibility check for powerpc64, and the test itself will reject other48 # architectures.49 case `uname -m` in50 "x86_64")51 check_supported_x86_6452 ;;53 *)54 return 055 ;;56 esac57}58 59check_test_requirements60./va_high_addr_switch --run-hugetlb61