# INTEL_IOMMU Functional tests
#
# Copyright (c) 2021 Red Hat, Inc.
#
# Author:
#  Eric Auger <eric.auger@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2 or
# later.  See the COPYING file in the top-level directory.
import os

from avocado import skipUnless
from avocado_qemu import LinuxTest

@skipUnless(os.getenv('QEMU_TEST_FLAKY_TESTS'), 'Test is unstable on GitLab')

class IntelIOMMU(LinuxTest):
    """
    :avocado: tags=arch:x86_64
    :avocado: tags=distro:fedora
    :avocado: tags=distro_version:31
    :avocado: tags=machine:q35
    :avocado: tags=accel:kvm
    :avocado: tags=intel_iommu
    :avocado: tags=flaky
    """

    IOMMU_ADDON = ',iommu_platform=on,disable-modern=off,disable-legacy=on'
    kernel_path = None
    initrd_path = None
    kernel_params = None

    def set_up_boot(self):
        path = self.download_boot()
        self.vm.add_args('-device', 'virtio-blk-pci,bus=pcie.0,scsi=off,' +
                         'drive=drv0,id=virtio-disk0,bootindex=1,'
                         'werror=stop,rerror=stop' + self.IOMMU_ADDON)
        self.vm.add_args('-device', 'virtio-gpu-pci' + self.IOMMU_ADDON)
        self.vm.add_args('-drive',
                         'file=%s,if=none,cache=writethrough,id=drv0' % path)

    def setUp(self):
        super(IntelIOMMU, self).setUp(None, 'virtio-net-pci' + self.IOMMU_ADDON)

    def add_common_args(self):
        self.vm.add_args('-device', 'virtio-rng-pci,rng=rng0')
        self.vm.add_args('-object',
                         'rng-random,id=rng0,filename=/dev/urandom')

    def common_vm_setup(self, custom_kernel=None):
        self.require_accelerator("kvm")
        self.add_common_args()
        self.vm.add_args("-accel", "kvm")

        if custom_kernel is None:
            return

        kernel_url = self.distro.pxeboot_url + 'vmlinuz'
        kernel_hash = '5b6f6876e1b5bda314f93893271da0d5777b1f3c'
        initrd_url = self.distro.pxeboot_url + 'initrd.img'
        initrd_hash = 'dd0340a1b39bd28f88532babd4581c67649ec5b1'
        self.kernel_path = self.fetch_asset(kernel_url, asset_hash=kernel_hash)
        self.initrd_path = self.fetch_asset(initrd_url, asset_hash=initrd_hash)

    def run_and_check(self):
        if self.kernel_path:
            self.vm.add_args('-kernel', self.kernel_path,
                             '-append', self.kernel_params,
                             '-initrd', self.initrd_path)
        self.launch_and_wait()
        self.ssh_command('cat /proc/cmdline')
        self.ssh_command('dmesg | grep -e DMAR -e IOMMU')
        self.ssh_command('find /sys/kernel/iommu_groups/ -type l')
        self.ssh_command('dnf -y install numactl-devel')

    def test_intel_iommu(self):
        """
        :avocado: tags=intel_iommu_intremap
        """

        self.common_vm_setup(True)
        self.vm.add_args('-device', 'intel-iommu,intremap=on')
        self.vm.add_args('-machine', 'kernel_irqchip=split')

        self.kernel_params = (self.distro.default_kernel_params +
                              ' quiet intel_iommu=on')
        self.run_and_check()

    def test_intel_iommu_strict(self):
        """
        :avocado: tags=intel_iommu_strict
        """

        self.common_vm_setup(True)
        self.vm.add_args('-device', 'intel-iommu,intremap=on')
        self.vm.add_args('-machine', 'kernel_irqchip=split')
        self.kernel_params = (self.distro.default_kernel_params +
                              ' quiet intel_iommu=on,strict')
        self.run_and_check()

    def test_intel_iommu_strict_cm(self):
        """
        :avocado: tags=intel_iommu_strict_cm
        """

        self.common_vm_setup(True)
        self.vm.add_args('-device', 'intel-iommu,intremap=on,caching-mode=on')
        self.vm.add_args('-machine', 'kernel_irqchip=split')
        self.kernel_params = (self.distro.default_kernel_params +
                              ' quiet intel_iommu=on,strict')
        self.run_and_check()

    def test_intel_iommu_pt(self):
        """
        :avocado: tags=intel_iommu_pt
        """

        self.common_vm_setup(True)
        self.vm.add_args('-device', 'intel-iommu,intremap=on')
        self.vm.add_args('-machine', 'kernel_irqchip=split')
        self.kernel_params = (self.distro.default_kernel_params +
                              ' quiet intel_iommu=on iommu=pt')
        self.run_and_check()