virtio: Add some debugging
When QEMU does not respond for some reason, it is helpful to have
debugging info to show. Add some.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/virtio/virtio_blk.c b/drivers/virtio/virtio_blk.c
index 30cfc56..9581058 100644
--- a/drivers/virtio/virtio_blk.c
+++ b/drivers/virtio/virtio_blk.c
@@ -4,6 +4,8 @@
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*/
+#define LOG_CATEGORY UCLASS_VIRTIO
+
#include <common.h>
#include <blk.h>
#include <dm.h>
@@ -42,6 +44,8 @@
sgs[num_out + num_in++] = &data_sg;
sgs[num_out + num_in++] = &status_sg;
+ log_debug("dev=%s, active=%d, priv=%p, priv->vq=%p\n", dev->name,
+ device_active(dev), priv, priv->vq);
ret = virtqueue_add(priv->vq, sgs, num_out, num_in);
if (ret)
@@ -49,8 +53,10 @@
virtqueue_kick(priv->vq);
+ log_debug("wait...");
while (!virtqueue_get_buf(priv->vq, NULL))
;
+ log_debug("done\n");
return status == VIRTIO_BLK_S_OK ? blkcnt : -EIO;
}
@@ -58,6 +64,7 @@
static ulong virtio_blk_read(struct udevice *dev, lbaint_t start,
lbaint_t blkcnt, void *buffer)
{
+ log_debug("read %s\n", dev->name);
return virtio_blk_do_req(dev, start, blkcnt, buffer,
VIRTIO_BLK_T_IN);
}