1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 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 the 7# real test to check that the kernel is configured to support at least 5 8# pagetable levels. 9 10# Kselftest framework requirement - SKIP code is 4. 11ksft_skip=4 12 13skip() 14{ 15 echo "$1" 16 exit $ksft_skip 17} 18 19check_supported_x86_64() 20{ 21 local config="/proc/config.gz" 22 [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" 23 [[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot" 24 25 # gzip -dcfq automatically handles both compressed and plaintext input. 26 # See man 1 gzip under '-f'. 27 local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) 28 29 local cpu_supports_pl5=$(awk '/^flags/ {if (/la57/) {print 0;} 30 else {print 1}; exit}' /proc/cpuinfo 2>/dev/null) 31 32 if [[ "${pg_table_levels}" -lt 5 ]]; then 33 skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" 34 elif [[ "${cpu_supports_pl5}" -ne 0 ]]; then 35 skip "$0: CPU does not have the necessary la57 flag to support page table level 5" 36 fi 37} 38 39check_supported_ppc64() 40{ 41 local config="/proc/config.gz" 42 [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" 43 [[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot" 44 45 local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) 46 if [[ "${pg_table_levels}" -lt 5 ]]; then 47 skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" 48 fi 49 50 local mmu_support=$(grep -m1 "mmu" /proc/cpuinfo | awk '{print $3}') 51 if [[ "$mmu_support" != "radix" ]]; then 52 skip "$0: System does not use Radix MMU, required for 5-level paging" 53 fi 54 55 local hugepages_total=$(awk '/HugePages_Total/ {print $2}' /proc/meminfo) 56 if [[ "${hugepages_total}" -eq 0 ]]; then 57 skip "$0: HugePages are not enabled, required for some tests" 58 fi 59} 60 61check_test_requirements() 62{ 63 # The test supports x86_64 and powerpc64. We currently have no useful 64 # eligibility check for powerpc64, and the test itself will reject other 65 # architectures. 66 case `uname -m` in 67 "x86_64") 68 check_supported_x86_64 69 ;; 70 "ppc64le"|"ppc64") 71 check_supported_ppc64 72 ;; 73 *) 74 return 0 75 ;; 76 esac 77} 78 79check_test_requirements 80./va_high_addr_switch --run-hugetlb 81