Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 "$0: HugePages are not enabled, required for some tests"
59 fi
60}
61
62check_test_requirements()
63{
64 # The test supports x86_64, powerpc64 and arm64. There's check for arm64
65 # in va_high_addr_switch.c. The test itself will reject other architectures.
66
67 case `uname -m` in
68 "x86_64")
69 check_supported_x86_64
70 ;;
71 "ppc64le"|"ppc64")
72 check_supported_ppc64
73 ;;
74 *)
75 return 0
76 ;;
77 esac
78}
79
80save_nr_hugepages()
81{
82 orig_nr_hugepages=$(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 "$0: no enough hugepages for testing"
109 fi
110}
111
112check_test_requirements
113save_nr_hugepages
114# The HugeTLB tests require 6 pages
115setup_nr_hugepages 6
116./va_high_addr_switch --run-hugetlb
117retcode=$?
118restore_nr_hugepages
119exit $retcode