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SysFSTools.pm: add mediated devices subs

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adds helpers for listing/creating/removing mediated devices

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
This commit is contained in:
Dominik Csapak 2018-11-20 17:13:37 +01:00 committed by Thomas Lamprecht
parent d6a2cdcb76
commit 44a4db5b60
1 changed files with 89 additions and 0 deletions
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src/PVE/SysFSTools.pm
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@ -33,6 +33,39 @@ sub lspci {
return $devices;
}
sub get_mdev_types {
my ($id) = @_;
my $fullid = $id;
if ($id !~ m/^[0-9a-fA-f]{4}:/) {
$fullid = "0000:$id";
}
my $types = [];
my $mdev_path = "$pcisysfs/devices/$fullid/mdev_supported_types";
if (!-d $mdev_path) {
return $types;
}
dir_glob_foreach($mdev_path, '[^\.].*', sub {
my ($type) = @_;
my $type_path = "$mdev_path/$type";
my $available = int(file_read_firstline("$type_path/available_instances"));
my $description = PVE::Tools::file_get_contents("$type_path/description");
push @$types, {
type => $type,
description => $description,
available => $available,
};
});
return $types;
}
sub check_iommu_support{
# we have IOMMU support if /sys/class/iommu/ is populated
return PVE::Tools::dir_glob_regex('/sys/class/iommu/', "[^\.].*");
@ -153,6 +186,62 @@ sub pci_dev_group_bind_to_vfio {
return 1;
}
sub pci_create_mdev_device {
my ($pciid, $uuid, $type) = @_;
my $basedir = "$pcisysfs/devices/0000:$pciid";
my $mdev_dir = "$basedir/mdev_supported_types";
die "pci device '$pciid' does not support mediated devices \n"
if !-d $mdev_dir;
die "pci device '$pciid' has no type '$type'\n"
if !-d "$mdev_dir/$type";
if (-d "$basedir/$uuid") {
# it already exists, checking type
my $typelink = readlink("$basedir/$uuid/mdev_type");
my ($existingtype) = $typelink =~ m|/([^/]+)$|;
die "mdev instance '$uuid' already exits, but type is not '$type'\n"
if $type ne $existingtype;
# instance exists, so use it but warn the user
warn "mdev instance '$uuid' already existed, using it.\n";
return undef;
}
my $instances = file_read_firstline("$mdev_dir/$type/available_instances");
my ($avail) = $instances =~ m/^(\d+)$/;
die "pci device '$pciid' has no available instances of '$type'\n"
if $avail < 1;
die "could not create 'type' for pci devices '$pciid'\n"
if !file_write("$mdev_dir/$type/create", $uuid);
return undef;
}
sub pci_cleanup_mdev_device {
my ($pciid, $uuid) = @_;
my $basedir = "$pcisysfs/devices/0000:$pciid/$uuid";
if (! -e $basedir) {
return 1; # no cleanup necessary if it does not exist
}
return file_write("$basedir/remove", "1");
}
# encode the hostpci index and vmid into the uuid
sub generate_mdev_uuid {
my ($vmid, $index) = @_;
my $string = sprintf("%08d-0000-0000-0000-%012d", $index, $vmid);
return $string;
}
# idea is from usbutils package (/usr/bin/usb-devices) script
sub __scan_usb_device {
my ($res, $devpath, $parent, $level) = @_;