src/PVE/SysFSTools.pm

   1 package PVE::SysFSTools;
   2
   3 use strict;
   4 use warnings;
   5
   6 use IO::File;
   7
   8 use PVE::Tools qw(file_read_firstline dir_glob_foreach);
   9
  10 my $pcisysfs = "/sys/bus/pci";
  11 my $pciregex = "([a-f0-9]{4}):([a-f0-9]{2}):([a-f0-9]{2})\.([a-f0-9])";
  12
  13 sub lspci {
  14     my ($filter) = @_;
  15
  16     my $devices = {};
  17
  18     dir_glob_foreach("$pcisysfs/devices", $pciregex, sub {
  19             my (undef, undef, $bus, $slot, $function) = @_;
  20             my $id = "$bus:$slot";
  21             return if defined($filter) && $id ne $filter;
  22             my $res = { id => $id, function => $function};
  23             push @{$devices->{$id}}, $res;
  24     });
  25
  26     # Entries should be sorted by functions.
  27     foreach my $id (keys %$devices) {
  28         my $dev = $devices->{$id};
  29         $devices->{$id} = [ sort { $a->{function} <=> $b->{function} } @$dev ];
  30     }
  31
  32     return $devices;
  33 }
  34
  35 sub check_iommu_support{
  36     # iommu support if there is anything in /sys/class/iommu besides . or ..
  37     return PVE::Tools::dir_glob_regex('/sys/class/iommu/', "[^\.].*");
  38 }
  39
  40 sub file_write {
  41     my ($filename, $buf) = @_;
  42
  43     my $fh = IO::File->new($filename, "w");
  44     return undef if !$fh;
  45
  46     my $res = print $fh $buf;
  47
  48     $fh->close();
  49
  50     return $res;
  51 }
  52
  53 sub pci_device_info {
  54     my ($name) = @_;
  55
  56     my $res;
  57
  58     return undef if $name !~ m/^${pciregex}$/;
  59     my ($domain, $bus, $slot, $func) = ($1, $2, $3, $4);
  60
  61     my $irq = file_read_firstline("$pcisysfs/devices/$name/irq");
  62     return undef if !defined($irq) || $irq !~ m/^\d+$/;
  63
  64     my $vendor = file_read_firstline("$pcisysfs/devices/$name/vendor");
  65     return undef if !defined($vendor) || $vendor !~ s/^0x//;
  66
  67     my $product = file_read_firstline("$pcisysfs/devices/$name/device");
  68     return undef if !defined($product) || $product !~ s/^0x//;
  69
  70     $res = {
  71         name => $name,
  72         vendor => $vendor,
  73         product => $product,
  74         domain => $domain,
  75         bus => $bus,
  76         slot => $slot,
  77         func => $func,
  78         irq => $irq,
  79         has_fl_reset => -f "$pcisysfs/devices/$name/reset" || 0,
  80     };
  81
  82     return $res;
  83 }
  84
  85 sub pci_dev_reset {
  86     my ($dev) = @_;
  87
  88     my $name = $dev->{name};
  89
  90     my $fn = "$pcisysfs/devices/$name/reset";
  91
  92     return file_write($fn, "1");
  93 }
  94
  95 sub pci_dev_bind_to_vfio {
  96     my ($dev) = @_;
  97
  98     my $name = $dev->{name};
  99
 100     my $vfio_basedir = "$pcisysfs/drivers/vfio-pci";
 101
 102     if (!-d $vfio_basedir) {
 103         system("/sbin/modprobe vfio-pci >/dev/null 2>/dev/null");
 104     }
 105     die "Cannot find vfio-pci module!\n" if !-d $vfio_basedir;
 106
 107     my $testdir = "$vfio_basedir/$name";
 108     return 1 if -d $testdir;
 109
 110     my $data = "$dev->{vendor} $dev->{product}";
 111     return undef if !file_write("$vfio_basedir/new_id", $data);
 112
 113     my $fn = "$pcisysfs/devices/$name/driver/unbind";
 114     if (!file_write($fn, $name)) {
 115         return undef if -f $fn;
 116     }
 117
 118     $fn = "$vfio_basedir/bind";
 119     if (! -d $testdir) {
 120         return undef if !file_write($fn, $name);
 121     }
 122
 123     return -d $testdir;
 124 }
 125
 126 sub pci_dev_group_bind_to_vfio {
 127     my ($pciid) = @_;
 128
 129     my $vfio_basedir = "$pcisysfs/drivers/vfio-pci";
 130
 131     if (!-d $vfio_basedir) {
 132         system("/sbin/modprobe vfio-pci >/dev/null 2>/dev/null");
 133     }
 134     die "Cannot find vfio-pci module!\n" if !-d $vfio_basedir;
 135
 136     # get IOMMU group devices
 137     opendir(my $D, "$pcisysfs/devices/0000:$pciid/iommu_group/devices/") || die "Cannot open iommu_group: $!\n";
 138       my @devs = grep /^0000:/, readdir($D);
 139     closedir($D);
 140
 141     foreach my $pciid (@devs) {
 142         $pciid =~ m/^([:\.\da-f]+)$/ or die "PCI ID $pciid not valid!\n";
 143
 144         # pci bridges, switches or root ports are not supported
 145         # they have a pci_bus subdirectory so skip them
 146         next if (-e "$pcisysfs/devices/$pciid/pci_bus");
 147
 148         my $info = pci_device_info($1);
 149         pci_dev_bind_to_vfio($info) || die "Cannot bind $pciid to vfio\n";
 150     }
 151
 152     return 1;
 153 }
 154
 155 1;