#!/bin/bash
#
# Shell functions for the rest of the scripts.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, you can access it online at
# http://www.gnu.org/licenses/gpl-2.0.html.
#
# Copyright (C) IBM Corporation, 2013
#
# Authors: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

# bootparam_hotplug_cpu bootparam-string
#
# Returns 1 if the specified boot-parameter string tells rcutorture to
# test CPU-hotplug operations.
bootparam_hotplug_cpu () {
	echo "$1" | grep -q "rcutorture\.onoff_"
}

# checkarg --argname argtype $# arg mustmatch cannotmatch
#
# Checks the specified argument "arg" against the mustmatch and cannotmatch
# patterns.
checkarg () {
	if test $3 -le 1
	then
		echo $1 needs argument $2 matching \"$5\"
		usage
	fi
	if echo "$4" | grep -q -e "$5"
	then
		:
	else
		echo $1 $2 \"$4\" must match \"$5\"
		usage
	fi
	if echo "$4" | grep -q -e "$6"
	then
		echo $1 $2 \"$4\" must not match \"$6\"
		usage
	fi
}

# configfrag_boot_params bootparam-string config-fragment-file
#
# Adds boot parameters from the .boot file, if any.
configfrag_boot_params () {
	if test -r "$2.boot"
	then
		echo $1 `grep -v '^#' "$2.boot" | tr '\012' ' '`
	else
		echo $1
	fi
}

# configfrag_boot_cpus bootparam-string config-fragment-file config-cpus
#
# Decreases number of CPUs based on any maxcpus= boot parameters specified.
configfrag_boot_cpus () {
	local bootargs="`configfrag_boot_params "$1" "$2"`"
	local maxcpus
	if echo "${bootargs}" | grep -q 'maxcpus=[0-9]'
	then
		maxcpus="`echo "${bootargs}" | sed -e 's/^.*maxcpus=\([0-9]*\).*$/\1/'`"
		if test "$3" -gt "$maxcpus"
		then
			echo $maxcpus
		else
			echo $3
		fi
	else
		echo $3
	fi
}

# configfrag_hotplug_cpu config-fragment-file
#
# Returns 1 if the config fragment specifies hotplug CPU.
configfrag_hotplug_cpu () {
	if test ! -r "$1"
	then
		echo Unreadable config fragment "$1" 1>&2
		exit -1
	fi
	grep -q '^CONFIG_HOTPLUG_CPU=y$' "$1"
}

# identify_boot_image qemu-cmd
#
# Returns the relative path to the kernel build image.  This will be
# arch/<arch>/boot/bzImage or vmlinux if bzImage is not a target for the
# architecture, unless overridden with the TORTURE_BOOT_IMAGE environment
# variable.
identify_boot_image () {
	if test -n "$TORTURE_BOOT_IMAGE"
	then
		echo $TORTURE_BOOT_IMAGE
	else
		case "$1" in
		qemu-system-x86_64|qemu-system-i386)
			echo arch/x86/boot/bzImage
			;;
		*)
			echo vmlinux
			;;
		esac
	fi
}

# identify_qemu builddir
#
# Returns our best guess as to which qemu command is appropriate for
# the kernel at hand.  Override with the TORTURE_QEMU_CMD environment variable.
identify_qemu () {
	local u="`file "$1"`"
	if test -n "$TORTURE_QEMU_CMD"
	then
		echo $TORTURE_QEMU_CMD
	elif echo $u | grep -q x86-64
	then
		echo qemu-system-x86_64
	elif echo $u | grep -q "Intel 80386"
	then
		echo qemu-system-i386
	elif uname -a | grep -q ppc64
	then
		echo qemu-system-ppc64
	else
		echo Cannot figure out what qemu command to use! 1>&2
		echo file $1 output: $u
		# Usually this will be one of /usr/bin/qemu-system-*
		# Use TORTURE_QEMU_CMD environment variable or appropriate
		# argument to top-level script.
		exit 1
	fi
}

# identify_qemu_append qemu-cmd
#
# Output arguments for the qemu "-append" string based on CPU type
# and the TORTURE_QEMU_INTERACTIVE environment variable.
identify_qemu_append () {
	case "$1" in
	qemu-system-x86_64|qemu-system-i386)
		echo noapic selinux=0 initcall_debug debug
		;;
	esac
	if test -n "$TORTURE_QEMU_INTERACTIVE"
	then
		echo root=/dev/sda
	else
		echo console=ttyS0
	fi
}

# identify_qemu_args qemu-cmd serial-file
#
# Output arguments for qemu arguments based on the TORTURE_QEMU_MAC
# and TORTURE_QEMU_INTERACTIVE environment variables.
identify_qemu_args () {
	case "$1" in
	qemu-system-x86_64|qemu-system-i386)
		;;
	qemu-system-ppc64)
		echo -enable-kvm -M pseries -nodefaults
		echo -device spapr-vscsi
		if test -n "$TORTURE_QEMU_INTERACTIVE" -a -n "$TORTURE_QEMU_MAC"
		then
			echo -device spapr-vlan,netdev=net0,mac=$TORTURE_QEMU_MAC
			echo -netdev bridge,br=br0,id=net0
		elif test -n "$TORTURE_QEMU_INTERACTIVE"
		then
			echo -net nic -net user
		fi
		;;
	esac
	if test -n "$TORTURE_QEMU_INTERACTIVE"
	then
		echo -monitor stdio -serial pty -S
	else
		echo -serial file:$2
	fi
}

# identify_qemu_vcpus
#
# Returns the number of virtual CPUs available to the aggregate of the
# guest OSes.
identify_qemu_vcpus () {
	lscpu | grep '^CPU(s):' | sed -e 's/CPU(s)://'
}

# print_bug
#
# Prints "BUG: " in red followed by remaining arguments
print_bug () {
	printf '\033[031mBUG: \033[m'
	echo $*
}

# print_warning
#
# Prints "WARNING: " in yellow followed by remaining arguments
print_warning () {
	printf '\033[033mWARNING: \033[m'
	echo $*
}

# specify_qemu_cpus qemu-cmd qemu-args #cpus
#
# Appends a string containing "-smp XXX" to qemu-args, unless the incoming
# qemu-args already contains "-smp".
specify_qemu_cpus () {
	local nt;

	if echo $2 | grep -q -e -smp
	then
		echo $2
	else
		case "$1" in
		qemu-system-x86_64|qemu-system-i386)
			echo $2 -smp $3
			;;
		qemu-system-ppc64)
			nt="`lscpu | grep '^NUMA node0' | sed -e 's/^[^,]*,\([0-9]*\),.*$/\1/'`"
			echo $2 -smp cores=`expr \( $3 + $nt - 1 \) / $nt`,threads=$nt
			;;
		esac
	fi
}
h><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>54a05a4883b73f80e4e1d8c4b15750aa01c39932</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/host/ehci-tegra.c?h=nds-private-remove&amp;id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>drivers/usb/host/ehci-tegra.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/host/ehci-tegra.c?h=nds-private-remove&amp;id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>883af14e67e8b8702b5560aa64c888c0cd0bd66c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/host/ehci-tegra.c?h=nds-private-remove&amp;id=bf29bddf0417a4783da3b24e8c9e017ac649326f&amp;id2=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/efi: Always map the first physical page into the EFI pagetables</div><div class='commit-msg'>Commit:

  129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode")

stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode.

It turns out though that there are 64-bit EFI implementations in the wild
(this particular problem has been reported on a Lenovo Yoga 710-11IKB),
which still make use of the first physical page for their own private use,
even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory
map.

In case there is no mapping for this particular frame in the EFI pagetables,
as soon as firmware tries to make use of it, a triple fault occurs and the
system reboots (in case of the Yoga 710-11IKB this is very early during bootup).

Fix that by always mapping the first page of physical memory into the EFI
pagetables. We're free to hand this page to the BIOS, as trim_bios_range()
will reserve the first page and isolate it away from memory allocators anyway.

Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the
regression on affected hardware, as this commit:

   ab72a27da ("x86/efi: Consolidate region mapping logic")

later made the first physical frame not to be mapped anyway.

Reported-by: Hanka Pavlikova &lt;hanka@ucw.cz&gt;
Signed-off-by: Jiri Kosina &lt;jkosina@suse.cz&gt;
Signed-off-by: Matt Fleming &lt;matt@codeblueprint.co.uk&gt;
Cc: Ard Biesheuvel &lt;ard.biesheuvel@linaro.org&gt;
Cc: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: Borislav Petkov &lt;bp@suse.de&gt;
Cc: Laura Abbott &lt;labbott@redhat.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Cc: Vojtech Pavlik &lt;vojtech@ucw.cz&gt;
Cc: Waiman Long &lt;waiman.long@hpe.com&gt;
Cc: linux-efi@vger.kernel.org
Cc: stable@kernel.org # v4.8+
Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode")
Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk
[ Tidied up the changelog and the comment. ]
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=bf29bddf0417a4783da3b24e8c9e017ac649326f'>Diffstat</a> (limited to 'drivers/usb/host/ehci-tegra.c')</div><table summary='diffstat' class='diffstat'>