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virtio/virtio-rng: make virtio-rng work for remoteproc transport layer

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For remoteproc transport layer, the virtio drivers can not use the malloced
memory from the default system heap to communicate with the virtio devices,
the buffers placed in virtqueue should be in the share memory region
(mallcoed virtio_alloc_buf()).

Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>
This commit is contained in:
Bowen Wang 2024-03-27 21:00:41 +08:00 committed by Xiang Xiao
parent 106040df6c
commit 7eda1700c2
1 changed files with 8 additions and 1 deletions
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9
drivers/virtio/virtio-rng.c
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@ -148,8 +148,13 @@ static ssize_t virtio_rng_read(FAR struct file *filep, FAR char *buffer,
* cookie. (virtqueue_get_buffer() will return cookie).
*/
vb.buf = buffer;
vb.len = buflen;
vb.buf = virtio_zalloc_buf(priv->vdev, buflen, 16);
if (vb.buf == NULL)
{
return -ENOMEM;
}
ret = virtqueue_add_buffer(vq, &vb, 0, 1, &cookie);
if (ret < 0)
{
@ -163,6 +168,8 @@ static ssize_t virtio_rng_read(FAR struct file *filep, FAR char *buffer,
/* Wait fot completion */
nxsem_wait_uninterruptible(&cookie.sem);
memcpy(buffer, vb.buf, cookie.len);
virtio_free_buf(priv->vdev, vb.buf);
return cookie.len;
}