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 12orig_nr_hugepages=0 13 14skip() 15{ 16 echo "$1" 17 exit $ksft_skip 18} 19 20check_supported_x86_64() 21{ 22 local config="/proc/config.gz" 23 [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" 24 [[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot" 25 26 # gzip -dcfq automatically handles both compressed and plaintext input. 27 # See man 1 gzip under '-f'. 28 local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) 29 30 local cpu_supports_pl5=$(awk '/^flags/ {if (/la57/) {print 0;} 31 else {print 1}; exit}' /proc/cpuinfo 2>/dev/null) 32 33 if [[ "${pg_table_levels}" -lt 5 ]]; then 34 skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" 35 elif [[ "${cpu_supports_pl5}" -ne 0 ]]; then 36 skip "$0: CPU does not have the necessary la57 flag to support page table level 5" 37 fi 38} 39 40check_supported_ppc64() 41{ 42 local config="/proc/config.gz" 43 [[ -f "${config}" ]] || config="/boot/config-$(uname -r)" 44 [[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot" 45 46 local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2) 47 if [[ "${pg_table_levels}" -lt 5 ]]; then 48 skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test" 49 fi 50 51 local mmu_support=$(grep -m1 "mmu" /proc/cpuinfo | awk '{print $3}') 52 if [[ "$mmu_support" != "radix" ]]; then 53 skip "$0: System does not use Radix MMU, required for 5-level paging" 54 fi 55 56 local hugepages_total=$(awk '/HugePages_Total/ {print $2}' /proc/meminfo) 57 if [[ "${hugepages_total}" -eq 0 ]]; then 58 skip "$0: HugePages are not enabled, required for some tests" 59 fi 60} 61 62check_test_requirements() 63{ 64 # The test supports x86_64 and powerpc64. We currently have no useful 65 # eligibility check for powerpc64, and the test itself will reject other 66 # architectures. 67 case `uname -m` in 68 "x86_64") 69 check_supported_x86_64 70 ;; 71 "ppc64le"|"ppc64") 72 check_supported_ppc64 73 ;; 74 *) 75 return 0 76 ;; 77 esac 78} 79 80save_nr_hugepages() 81{ 82 orig_nr_hugepages=$(cat /proc/sys/vm/nr_hugepages) 83} 84 85restore_nr_hugepages() 86{ 87 echo "$orig_nr_hugepages" > /proc/sys/vm/nr_hugepages 88} 89 90setup_nr_hugepages() 91{ 92 local needpgs=$1 93 while read -r name size unit; do 94 if [ "$name" = "HugePages_Free:" ]; then 95 freepgs="$size" 96 break 97 fi 98 done < /proc/meminfo 99 if [ "$freepgs" -ge "$needpgs" ]; then 100 return 101 fi 102 local hpgs=$((orig_nr_hugepages + needpgs)) 103 echo $hpgs > /proc/sys/vm/nr_hugepages 104 105 local nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages) 106 if [ "$nr_hugepgs" != "$hpgs" ]; then 107 restore_nr_hugepages 108 skip "$0: no enough hugepages for testing" 109 fi 110} 111 112check_test_requirements 113save_nr_hugepages 114# 4 keep_mapped pages, and one for tmp usage 115setup_nr_hugepages 5 116./va_high_addr_switch --run-hugetlb 117restore_nr_hugepages 118