1#!/bin/bash
2#
3# Shell functions for the rest of the scripts.
4#
5# This program is free software; you can redistribute it and/or modify
6# it under the terms of the GNU General Public License as published by
7# the Free Software Foundation; either version 2 of the License, or
8# (at your option) any later version.
9#
10# This program is distributed in the hope that it will be useful,
11# but WITHOUT ANY WARRANTY; without even the implied warranty of
12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13# GNU General Public License for more details.
14#
15# You should have received a copy of the GNU General Public License
16# along with this program; if not, you can access it online at
17# http://www.gnu.org/licenses/gpl-2.0.html.
18#
19# Copyright (C) IBM Corporation, 2013
20#
21# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
22
23# bootparam_hotplug_cpu bootparam-string
24#
25# Returns 1 if the specified boot-parameter string tells rcutorture to
26# test CPU-hotplug operations.
27bootparam_hotplug_cpu () {
28	echo "$1" | grep -q "rcutorture\.onoff_"
29}
30
31# checkarg --argname argtype $# arg mustmatch cannotmatch
32#
33# Checks the specified argument "arg" against the mustmatch and cannotmatch
34# patterns.
35checkarg () {
36	if test $3 -le 1
37	then
38		echo $1 needs argument $2 matching \"$5\"
39		usage
40	fi
41	if echo "$4" | grep -q -e "$5"
42	then
43		:
44	else
45		echo $1 $2 \"$4\" must match \"$5\"
46		usage
47	fi
48	if echo "$4" | grep -q -e "$6"
49	then
50		echo $1 $2 \"$4\" must not match \"$6\"
51		usage
52	fi
53}
54
55# configfrag_boot_params bootparam-string config-fragment-file
56#
57# Adds boot parameters from the .boot file, if any.
58configfrag_boot_params () {
59	if test -r "$2.boot"
60	then
61		echo $1 `grep -v '^#' "$2.boot" | tr '\012' ' '`
62	else
63		echo $1
64	fi
65}
66
67# configfrag_boot_cpus bootparam-string config-fragment-file config-cpus
68#
69# Decreases number of CPUs based on any maxcpus= boot parameters specified.
70configfrag_boot_cpus () {
71	local bootargs="`configfrag_boot_params "$1" "$2"`"
72	local maxcpus
73	if echo "${bootargs}" | grep -q 'maxcpus=[0-9]'
74	then
75		maxcpus="`echo "${bootargs}" | sed -e 's/^.*maxcpus=\([0-9]*\).*$/\1/'`"
76		if test "$3" -gt "$maxcpus"
77		then
78			echo $maxcpus
79		else
80			echo $3
81		fi
82	else
83		echo $3
84	fi
85}
86
87# configfrag_hotplug_cpu config-fragment-file
88#
89# Returns 1 if the config fragment specifies hotplug CPU.
90configfrag_hotplug_cpu () {
91	if test ! -r "$1"
92	then
93		echo Unreadable config fragment "$1" 1>&2
94		exit -1
95	fi
96	grep -q '^CONFIG_HOTPLUG_CPU=y$' "$1"
97}
98
99# identify_boot_image qemu-cmd
100#
101# Returns the relative path to the kernel build image.  This will be
102# arch/<arch>/boot/bzImage unless overridden with the TORTURE_BOOT_IMAGE
103# environment variable.
104identify_boot_image () {
105	if test -n "$TORTURE_BOOT_IMAGE"
106	then
107		echo $TORTURE_BOOT_IMAGE
108	else
109		case "$1" in
110		qemu-system-x86_64|qemu-system-i386)
111			echo arch/x86/boot/bzImage
112			;;
113		qemu-system-ppc64)
114			echo arch/powerpc/boot/bzImage
115			;;
116		*)
117			echo ""
118			;;
119		esac
120	fi
121}
122
123# identify_qemu builddir
124#
125# Returns our best guess as to which qemu command is appropriate for
126# the kernel at hand.  Override with the TORTURE_QEMU_CMD environment variable.
127identify_qemu () {
128	local u="`file "$1"`"
129	if test -n "$TORTURE_QEMU_CMD"
130	then
131		echo $TORTURE_QEMU_CMD
132	elif echo $u | grep -q x86-64
133	then
134		echo qemu-system-x86_64
135	elif echo $u | grep -q "Intel 80386"
136	then
137		echo qemu-system-i386
138	elif uname -a | grep -q ppc64
139	then
140		echo qemu-system-ppc64
141	else
142		echo Cannot figure out what qemu command to use! 1>&2
143		echo file $1 output: $u
144		# Usually this will be one of /usr/bin/qemu-system-*
145		# Use TORTURE_QEMU_CMD environment variable or appropriate
146		# argument to top-level script.
147		exit 1
148	fi
149}
150
151# identify_qemu_append qemu-cmd
152#
153# Output arguments for the qemu "-append" string based on CPU type
154# and the TORTURE_QEMU_INTERACTIVE environment variable.
155identify_qemu_append () {
156	case "$1" in
157	qemu-system-x86_64|qemu-system-i386)
158		echo noapic selinux=0 initcall_debug debug
159		;;
160	esac
161	if test -n "$TORTURE_QEMU_INTERACTIVE"
162	then
163		echo root=/dev/sda
164	else
165		echo console=ttyS0
166	fi
167}
168
169# identify_qemu_args qemu-cmd serial-file
170#
171# Output arguments for qemu arguments based on the TORTURE_QEMU_MAC
172# and TORTURE_QEMU_INTERACTIVE environment variables.
173identify_qemu_args () {
174	case "$1" in
175	qemu-system-x86_64|qemu-system-i386)
176		;;
177	qemu-system-ppc64)
178		echo -enable-kvm -M pseries -cpu POWER7 -nodefaults
179		echo -device spapr-vscsi
180		if test -n "$TORTURE_QEMU_INTERACTIVE" -a -n "$TORTURE_QEMU_MAC"
181		then
182			echo -device spapr-vlan,netdev=net0,mac=$TORTURE_QEMU_MAC
183			echo -netdev bridge,br=br0,id=net0
184		elif test -n "$TORTURE_QEMU_INTERACTIVE"
185		then
186			echo -net nic -net user
187		fi
188		;;
189	esac
190	if test -n "$TORTURE_QEMU_INTERACTIVE"
191	then
192		echo -monitor stdio -serial pty -S
193	else
194		echo -serial file:$2
195	fi
196}
197
198# identify_qemu_vcpus
199#
200# Returns the number of virtual CPUs available to the aggregate of the
201# guest OSes.
202identify_qemu_vcpus () {
203	lscpu | grep '^CPU(s):' | sed -e 's/CPU(s)://'
204}
205
206# print_bug
207#
208# Prints "BUG: " in red followed by remaining arguments
209print_bug () {
210	printf '\033[031mBUG: \033[m'
211	echo $*
212}
213
214# print_warning
215#
216# Prints "WARNING: " in yellow followed by remaining arguments
217print_warning () {
218	printf '\033[033mWARNING: \033[m'
219	echo $*
220}
221
222# specify_qemu_cpus qemu-cmd qemu-args #cpus
223#
224# Appends a string containing "-smp XXX" to qemu-args, unless the incoming
225# qemu-args already contains "-smp".
226specify_qemu_cpus () {
227	local nt;
228
229	if echo $2 | grep -q -e -smp
230	then
231		echo $2
232	else
233		case "$1" in
234		qemu-system-x86_64|qemu-system-i386)
235			echo $2 -smp $3
236			;;
237		qemu-system-ppc64)
238			nt="`lscpu | grep '^NUMA node0' | sed -e 's/^[^,]*,\([0-9]*\),.*$/\1/'`"
239			echo $2 -smp cores=`expr \( $3 + $nt - 1 \) / $nt`,threads=$nt
240			;;
241		esac
242	fi
243}
244