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 # 1 means the test failed
11 exitcode=1
12
13 # Kselftest framework requirement - SKIP code is 4.
14 ksft_skip=4
15
16 fail()
17 {
18 echo "$1"
19 exit $exitcode
20 }
21
22 check_supported_x86_64()
23 {
24 local config="/proc/config.gz"
25 [[ -f "${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 ]]; then
36 echo "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
37 exit $ksft_skip
38 elif [[ "${cpu_supports_pl5}" -ne 0 ]]; then
39 echo "$0: CPU does not have the necessary la57 flag to support page table level 5"
40 exit $ksft_skip
41 fi
42 }
43
44 check_test_requirements()
45 {
46 # The test supports x86_64 and powerpc64. We currently have no useful
47 # eligibility check for powerpc64, and the test itself will reject other
48 # architectures.
49 case `uname -m` in
50 "x86_64")
51 check_supported_x86_64
52 ;;
53 *)
54 return 0
55 ;;
56 esac
57 }
58
59 check_test_requirements
60 ./va_high_addr_switch --run-hugetlb
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