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dm: test: virtio: Test the virtio ring

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The virtio ring is the basis of virtio communication. Test its basic
functionality and its resilience against corruption from the device.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Andrew Scull 2022-05-16 10:41:33 +00:00 • committed by Tom Rini
parent fbef3f53d4
commit b1fe820b63
1 changed files with 72 additions and 0 deletions
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72
test/dm/virtio.c
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@ -130,3 +130,75 @@ static int dm_test_virtio_remove(struct unit_test_state *uts)
return 0;
}
DM_TEST(dm_test_virtio_remove, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
/* Test all of the virtio ring */
static int dm_test_virtio_ring(struct unit_test_state *uts)
{
struct udevice *bus, *dev;
struct virtio_dev_priv *uc_priv;
struct virtqueue *vq;
struct virtio_sg sg[2];
struct virtio_sg *sgs[2];
unsigned int len;
u8 buffer[2][32];
/* check probe success */
ut_assertok(uclass_first_device(UCLASS_VIRTIO, &bus));
ut_assertnonnull(bus);
/* check the child virtio-blk device is bound */
ut_assertok(device_find_first_child(bus, &dev));
ut_assertnonnull(dev);
/*
* fake the virtio device probe by filling in uc_priv->vdev
* which is used by virtio_find_vqs/virtio_del_vqs.
*/
uc_priv = dev_get_uclass_priv(bus);
ut_assertnonnull(uc_priv);
uc_priv->vdev = dev;
/* prepare the scatter-gather buffer */
sg[0].addr = buffer[0];
sg[0].length = sizeof(buffer[0]);
sg[1].addr = buffer[1];
sg[1].length = sizeof(buffer[1]);
sgs[0] = &sg[0];
sgs[1] = &sg[1];
/* read a buffer and report written size from device */
ut_assertok(virtio_find_vqs(dev, 1, &vq));
ut_assertok(virtqueue_add(vq, sgs, 0, 1));
vq->vring.used->idx = 1;
vq->vring.used->ring[0].id = 0;
vq->vring.used->ring[0].len = 0x53355885;
ut_asserteq_ptr(buffer, virtqueue_get_buf(vq, &len));
ut_asserteq(0x53355885, len);
ut_assertok(virtio_del_vqs(dev));
/* rejects used descriptors that aren't a chain head */
ut_assertok(virtio_find_vqs(dev, 1, &vq));
ut_assertok(virtqueue_add(vq, sgs, 0, 2));
vq->vring.used->idx = 1;
vq->vring.used->ring[0].id = 1;
vq->vring.used->ring[0].len = 0x53355885;
ut_assertnull(virtqueue_get_buf(vq, &len));
ut_assertok(virtio_del_vqs(dev));
/* device changes to descriptor are ignored */
ut_assertok(virtio_find_vqs(dev, 1, &vq));
ut_assertok(virtqueue_add(vq, sgs, 0, 1));
vq->vring.desc[0].addr = cpu_to_virtio64(dev, 0xbadbad11);
vq->vring.desc[0].len = cpu_to_virtio32(dev, 0x11badbad);
vq->vring.desc[0].flags = cpu_to_virtio16(dev, VRING_DESC_F_NEXT);
vq->vring.desc[0].next = cpu_to_virtio16(dev, U16_MAX);
vq->vring.used->idx = 1;
vq->vring.used->ring[0].id = 0;
vq->vring.used->ring[0].len = 6;
ut_asserteq_ptr(buffer, virtqueue_get_buf(vq, &len));
ut_asserteq(6, len);
ut_assertok(virtio_del_vqs(dev));
return 0;
}
DM_TEST(dm_test_virtio_ring, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);