Quelle  va_high_addr_switch.sh   Sprache: Shell

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (C) 2022 Adam Sindelar (Meta) <adam@wowsignal.io>
#
# This is a test for mmap behavior with 5-level paging. This script wraps the
# real test to check that the kernel is configured to support at least 5
# pagetable levels.

# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4

skip()
{
 echo "$1"
 exit $ksft_skip
}

check_supported_x86_64()
{
 local config="/proc/config.gz"
 [[ -f "${config}" ]] || config="/boot/config-$(uname -r)"
 [[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot"

 # gzip -dcfq automatically handles both compressed and plaintext input.
 # See man 1 gzip under '-f'.
 local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2)

 local cpu_supports_pl5=$(awk '/^flags/ {if (/la57/) {print 0;}
  else {print 1}; exit}' /proc/cpuinfo 2>/dev/null)

 if [[ "${pg_table_levels}" -lt 5 ]]; then
  skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
 elif [[ "${cpu_supports_pl5}" -ne 0 ]]; then
  skip "$0: CPU does not have the necessary la57 flag to support page table level 5"
 fi
}

check_supported_ppc64()
{
 local config="/proc/config.gz"
 [[ -f "${config}" ]] || config="/boot/config-$(uname -r)"
 [[ -f "${config}" ]] || skip "Cannot find kernel config in /proc or /boot"

 local pg_table_levels=$(gzip -dcfq "${config}" | grep PGTABLE_LEVELS | cut -d'=' -f 2)
 if [[ "${pg_table_levels}" -lt 5 ]]; then
  skip "$0: PGTABLE_LEVELS=${pg_table_levels}, must be >= 5 to run this test"
 fi

 local mmu_support=$(grep -m1 "mmu" /proc/cpuinfo | awk '{print $3}')
 if [[ "$mmu_support" != "radix" ]]; then
  skip "$0: System does not use Radix MMU, required for 5-level paging"
 fi

 local hugepages_total=$(awk '/HugePages_Total/ {print $2}' /proc/meminfo)
 if [[ "${hugepages_total}" -eq 0 ]]; then
  skip "$0: HugePages are not enabled, required for some tests"
 fi
}

check_test_requirements()
{
 # The test supports x86_64 and powerpc64. We currently have no useful
 # eligibility check for powerpc64, and the test itself will reject other
 # architectures.
 case `uname -m` in
  "x86_64")
   check_supported_x86_64
  ;;
  "ppc64le"|"ppc64")
   check_supported_ppc64
  ;;
  *)
   return 0
  ;;
 esac
}

check_test_requirements
./va_high_addr_switch --run-hugetlb