Revision 1fd684346d41f6be2487c161f60d03a7feb68911 authored by Rafael J. Wysocki on 19 January 2009, 19:57:36 UTC, committed by Jeff Garzik on 27 January 2009, 07:15:51 UTC
Some notebooks from HP have the problem that their BIOSes attempt to spin down hard drives before entering ACPI system states S4 and S5. This leads to a yo-yo effect during system power-off shutdown and the last phase of hibernation when the disk is first spun down by the kernel and then almost immediately turned on and off by the BIOS. This, in turn, may result in shortening the disk's life times. To prevent this from happening we can blacklist the affected systems using DMI information. Blacklist HP nx6310 that uses the AHCI driver. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
1 parent 2a6e58d
timeconst.pl
#!/usr/bin/perl
# -----------------------------------------------------------------------
#
# Copyright 2007-2008 rPath, Inc. - All Rights Reserved
#
# This file is part of the Linux kernel, and is made available under
# the terms of the GNU General Public License version 2 or (at your
# option) any later version; incorporated herein by reference.
#
# -----------------------------------------------------------------------
#
#
# Usage: timeconst.pl HZ > timeconst.h
#
# Precomputed values for systems without Math::BigInt
# Generated by:
# timeconst.pl --can 24 32 48 64 100 122 128 200 250 256 300 512 1000 1024 1200
%canned_values = (
24 => [
'0xa6aaaaab','0x2aaaaaa',26,
125,3,
'0xc49ba5e4','0x1fbe76c8b4',37,
3,125,
'0xa2c2aaab','0xaaaa',16,
125000,3,
'0xc9539b89','0x7fffbce4217d',47,
3,125000,
], 32 => [
'0xfa000000','0x6000000',27,
125,4,
'0x83126e98','0xfdf3b645a',36,
4,125,
'0xf4240000','0x0',17,
31250,1,
'0x8637bd06','0x3fff79c842fa',46,
1,31250,
], 48 => [
'0xa6aaaaab','0x6aaaaaa',27,
125,6,
'0xc49ba5e4','0xfdf3b645a',36,
6,125,
'0xa2c2aaab','0x15555',17,
62500,3,
'0xc9539b89','0x3fffbce4217d',46,
3,62500,
], 64 => [
'0xfa000000','0xe000000',28,
125,8,
'0x83126e98','0x7ef9db22d',35,
8,125,
'0xf4240000','0x0',18,
15625,1,
'0x8637bd06','0x1fff79c842fa',45,
1,15625,
], 100 => [
'0xa0000000','0x0',28,
10,1,
'0xcccccccd','0x733333333',35,
1,10,
'0x9c400000','0x0',18,
10000,1,
'0xd1b71759','0x1fff2e48e8a7',45,
1,10000,
], 122 => [
'0x8325c53f','0xfbcda3a',28,
500,61,
'0xf9db22d1','0x7fbe76c8b',35,
61,500,
'0x8012e2a0','0x3ef36',18,
500000,61,
'0xffda4053','0x1ffffbce4217',45,
61,500000,
], 128 => [
'0xfa000000','0x1e000000',29,
125,16,
'0x83126e98','0x3f7ced916',34,
16,125,
'0xf4240000','0x40000',19,
15625,2,
'0x8637bd06','0xfffbce4217d',44,
2,15625,
], 200 => [
'0xa0000000','0x0',29,
5,1,
'0xcccccccd','0x333333333',34,
1,5,
'0x9c400000','0x0',19,
5000,1,
'0xd1b71759','0xfff2e48e8a7',44,
1,5000,
], 250 => [
'0x80000000','0x0',29,
4,1,
'0x80000000','0x180000000',33,
1,4,
'0xfa000000','0x0',20,
4000,1,
'0x83126e98','0x7ff7ced9168',43,
1,4000,
], 256 => [
'0xfa000000','0x3e000000',30,
125,32,
'0x83126e98','0x1fbe76c8b',33,
32,125,
'0xf4240000','0xc0000',20,
15625,4,
'0x8637bd06','0x7ffde7210be',43,
4,15625,
], 300 => [
'0xd5555556','0x2aaaaaaa',30,
10,3,
'0x9999999a','0x1cccccccc',33,
3,10,
'0xd0555556','0xaaaaa',20,
10000,3,
'0x9d495183','0x7ffcb923a29',43,
3,10000,
], 512 => [
'0xfa000000','0x7e000000',31,
125,64,
'0x83126e98','0xfdf3b645',32,
64,125,
'0xf4240000','0x1c0000',21,
15625,8,
'0x8637bd06','0x3ffef39085f',42,
8,15625,
], 1000 => [
'0x80000000','0x0',31,
1,1,
'0x80000000','0x0',31,
1,1,
'0xfa000000','0x0',22,
1000,1,
'0x83126e98','0x1ff7ced9168',41,
1,1000,
], 1024 => [
'0xfa000000','0xfe000000',32,
125,128,
'0x83126e98','0x7ef9db22',31,
128,125,
'0xf4240000','0x3c0000',22,
15625,16,
'0x8637bd06','0x1fff79c842f',41,
16,15625,
], 1200 => [
'0xd5555556','0xd5555555',32,
5,6,
'0x9999999a','0x66666666',31,
6,5,
'0xd0555556','0x2aaaaa',22,
2500,3,
'0x9d495183','0x1ffcb923a29',41,
3,2500,
]
);
$has_bigint = eval 'use Math::BigInt qw(bgcd); 1;';
sub bint($)
{
my($x) = @_;
return Math::BigInt->new($x);
}
#
# Constants for division by reciprocal multiplication.
# (bits, numerator, denominator)
#
sub fmul($$$)
{
my ($b,$n,$d) = @_;
$n = bint($n);
$d = bint($d);
return scalar (($n << $b)+$d-bint(1))/$d;
}
sub fadj($$$)
{
my($b,$n,$d) = @_;
$n = bint($n);
$d = bint($d);
$d = $d/bgcd($n, $d);
return scalar (($d-bint(1)) << $b)/$d;
}
sub fmuls($$$) {
my($b,$n,$d) = @_;
my($s,$m);
my($thres) = bint(1) << ($b-1);
$n = bint($n);
$d = bint($d);
for ($s = 0; 1; $s++) {
$m = fmul($s,$n,$d);
return $s if ($m >= $thres);
}
return 0;
}
# Generate a hex value if the result fits in 64 bits;
# otherwise skip.
sub bignum_hex($) {
my($x) = @_;
my $s = $x->as_hex();
return (length($s) > 18) ? undef : $s;
}
# Provides mul, adj, and shr factors for a specific
# (bit, time, hz) combination
sub muladj($$$) {
my($b, $t, $hz) = @_;
my $s = fmuls($b, $t, $hz);
my $m = fmul($s, $t, $hz);
my $a = fadj($s, $t, $hz);
return (bignum_hex($m), bignum_hex($a), $s);
}
# Provides numerator, denominator values
sub numden($$) {
my($n, $d) = @_;
my $g = bgcd($n, $d);
return ($n/$g, $d/$g);
}
# All values for a specific (time, hz) combo
sub conversions($$) {
my ($t, $hz) = @_;
my @val = ();
# HZ_TO_xx
push(@val, muladj(32, $t, $hz));
push(@val, numden($t, $hz));
# xx_TO_HZ
push(@val, muladj(32, $hz, $t));
push(@val, numden($hz, $t));
return @val;
}
sub compute_values($) {
my($hz) = @_;
my @val = ();
my $s, $m, $a, $g;
if (!$has_bigint) {
die "$0: HZ == $hz not canned and ".
"Math::BigInt not available\n";
}
# MSEC conversions
push(@val, conversions(1000, $hz));
# USEC conversions
push(@val, conversions(1000000, $hz));
return @val;
}
sub outputval($$)
{
my($name, $val) = @_;
my $csuf;
if (defined($val)) {
if ($name !~ /SHR/) {
$val = "U64_C($val)";
}
printf "#define %-23s %s\n", $name.$csuf, $val.$csuf;
}
}
sub output($@)
{
my($hz, @val) = @_;
my $pfx, $bit, $suf, $s, $m, $a;
print "/* Automatically generated by kernel/timeconst.pl */\n";
print "/* Conversion constants for HZ == $hz */\n";
print "\n";
print "#ifndef KERNEL_TIMECONST_H\n";
print "#define KERNEL_TIMECONST_H\n";
print "\n";
print "#include <linux/param.h>\n";
print "#include <linux/types.h>\n";
print "\n";
print "#if HZ != $hz\n";
print "#error \"kernel/timeconst.h has the wrong HZ value!\"\n";
print "#endif\n";
print "\n";
foreach $pfx ('HZ_TO_MSEC','MSEC_TO_HZ',
'HZ_TO_USEC','USEC_TO_HZ') {
foreach $bit (32) {
foreach $suf ('MUL', 'ADJ', 'SHR') {
outputval("${pfx}_$suf$bit", shift(@val));
}
}
foreach $suf ('NUM', 'DEN') {
outputval("${pfx}_$suf", shift(@val));
}
}
print "\n";
print "#endif /* KERNEL_TIMECONST_H */\n";
}
# Pretty-print Perl values
sub perlvals(@) {
my $v;
my @l = ();
foreach $v (@_) {
if (!defined($v)) {
push(@l, 'undef');
} elsif ($v =~ /^0x/) {
push(@l, "\'".$v."\'");
} else {
push(@l, $v.'');
}
}
return join(',', @l);
}
($hz) = @ARGV;
# Use this to generate the %canned_values structure
if ($hz eq '--can') {
shift(@ARGV);
@hzlist = sort {$a <=> $b} (@ARGV);
print "# Precomputed values for systems without Math::BigInt\n";
print "# Generated by:\n";
print "# timeconst.pl --can ", join(' ', @hzlist), "\n";
print "\%canned_values = (\n";
my $pf = "\t";
foreach $hz (@hzlist) {
my @values = compute_values($hz);
print "$pf$hz => [\n";
while (scalar(@values)) {
my $bit;
foreach $bit (32) {
my $m = shift(@values);
my $a = shift(@values);
my $s = shift(@values);
print "\t\t", perlvals($m,$a,$s), ",\n";
}
my $n = shift(@values);
my $d = shift(@values);
print "\t\t", perlvals($n,$d), ",\n";
}
print "\t]";
$pf = ', ';
}
print "\n);\n";
} else {
$hz += 0; # Force to number
if ($hz < 1) {
die "Usage: $0 HZ\n";
}
@val = @{$canned_values{$hz}};
if (!defined(@val)) {
@val = compute_values($hz);
}
output($hz, @val);
}
exit 0;
Computing file changes ...
