test/py/test_irq_trigger.py

#
# Copyright (c) 2021 Nutanix Inc. All rights reserved.
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# Authors: John Levon <john.levon@nutanix.com>
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from libvfio_user import *
import ctypes as c
import errno

ctx = None
sock = None


def test_irq_trigger_setup():
    global ctx, sock

    ctx = vfu_create_ctx(flags=LIBVFIO_USER_FLAG_ATTACH_NB)
    assert ctx is not None

    ret = vfu_pci_init(ctx)
    assert ret == 0

    ret = vfu_setup_device_nr_irqs(ctx, VFU_DEV_MSIX_IRQ, 2048)
    assert ret == 0

    ret = vfu_realize_ctx(ctx)
    assert ret == 0

    sock = connect_client(ctx)


def test_irq_trigger_bad_subindex():
    ret = vfu_irq_trigger(ctx, 2048)
    assert ret == -1
    assert c.get_errno() == errno.EINVAL

    ret = vfu_irq_trigger(ctx, 2049)
    assert ret == -1
    assert c.get_errno() == errno.EINVAL


def test_irq_trigger_no_interrupt():
    ret = vfu_irq_trigger(ctx, 0)
    assert ret == -1
    assert c.get_errno() == errno.ENOENT


def test_irq_trigger():
    # struct vfio_irq_set
    payload = struct.pack("IIIII", 20, VFIO_IRQ_SET_ACTION_TRIGGER |
                          VFIO_IRQ_SET_DATA_EVENTFD, VFU_DEV_MSIX_IRQ, 8, 1)

    fd = eventfd(initval=4)

    msg(ctx, sock, VFIO_USER_DEVICE_SET_IRQS, payload, fds=[fd])

    vfu_irq_trigger(ctx, 8)

    assert struct.unpack("Q", os.read(fd, 8))[0] == 5


def test_irq_trigger_cleanup():
    vfu_destroy_ctx(ctx)

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