linux-kernel - [PATCH 1/3] vdpa_sim_blk: use dev

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Date:   Tue, 21 Jun 2022 18:08:57 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     Jason Wang <jasowang@...hat.com>,
        Eugenio Pérez <eperezma@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        linux-kernel@...r.kernel.org,
        Stefano Garzarella <sgarzare@...hat.com>
Subject: [PATCH 1/3] vdpa_sim_blk: use dev_dbg() to print errors

Use dev_dbg() instead of dev_err()/dev_warn() to avoid flooding the
host with prints, when the guest driver is misbehaving.
In this way, prints can be dynamically enabled when the vDPA block
simulator is used to validate a driver.

Suggested-by: Jason Wang <jasowang@...hat.com>
Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
index 42d401d43911..a83a5c76f620 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
@@ -76,13 +76,13 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 		return false;
 
 	if (vq->out_iov.used < 1 || vq->in_iov.used < 1) {
-		dev_err(&vdpasim->vdpa.dev, "missing headers - out_iov: %u in_iov %u\n",
+		dev_dbg(&vdpasim->vdpa.dev, "missing headers - out_iov: %u in_iov %u\n",
 			vq->out_iov.used, vq->in_iov.used);
 		return false;
 	}
 
 	if (vq->in_iov.iov[vq->in_iov.used - 1].iov_len < 1) {
-		dev_err(&vdpasim->vdpa.dev, "request in header too short\n");
+		dev_dbg(&vdpasim->vdpa.dev, "request in header too short\n");
 		return false;
 	}
 
@@ -96,7 +96,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 	bytes = vringh_iov_pull_iotlb(&vq->vring, &vq->out_iov, &hdr,
 				      sizeof(hdr));
 	if (bytes != sizeof(hdr)) {
-		dev_err(&vdpasim->vdpa.dev, "request out header too short\n");
+		dev_dbg(&vdpasim->vdpa.dev, "request out header too short\n");
 		return false;
 	}
 
@@ -110,7 +110,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 	switch (type) {
 	case VIRTIO_BLK_T_IN:
 		if (!vdpasim_blk_check_range(sector, to_push)) {
-			dev_err(&vdpasim->vdpa.dev,
+			dev_dbg(&vdpasim->vdpa.dev,
 				"reading over the capacity - offset: 0x%llx len: 0x%zx\n",
 				offset, to_push);
 			status = VIRTIO_BLK_S_IOERR;
@@ -121,7 +121,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 					      vdpasim->buffer + offset,
 					      to_push);
 		if (bytes < 0) {
-			dev_err(&vdpasim->vdpa.dev,
+			dev_dbg(&vdpasim->vdpa.dev,
 				"vringh_iov_push_iotlb() error: %zd offset: 0x%llx len: 0x%zx\n",
 				bytes, offset, to_push);
 			status = VIRTIO_BLK_S_IOERR;
@@ -133,7 +133,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 
 	case VIRTIO_BLK_T_OUT:
 		if (!vdpasim_blk_check_range(sector, to_pull)) {
-			dev_err(&vdpasim->vdpa.dev,
+			dev_dbg(&vdpasim->vdpa.dev,
 				"writing over the capacity - offset: 0x%llx len: 0x%zx\n",
 				offset, to_pull);
 			status = VIRTIO_BLK_S_IOERR;
@@ -144,7 +144,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 					      vdpasim->buffer + offset,
 					      to_pull);
 		if (bytes < 0) {
-			dev_err(&vdpasim->vdpa.dev,
+			dev_dbg(&vdpasim->vdpa.dev,
 				"vringh_iov_pull_iotlb() error: %zd offset: 0x%llx len: 0x%zx\n",
 				bytes, offset, to_pull);
 			status = VIRTIO_BLK_S_IOERR;
@@ -157,7 +157,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 					      vdpasim_blk_id,
 					      VIRTIO_BLK_ID_BYTES);
 		if (bytes < 0) {
-			dev_err(&vdpasim->vdpa.dev,
+			dev_dbg(&vdpasim->vdpa.dev,
 				"vringh_iov_push_iotlb() error: %zd\n", bytes);
 			status = VIRTIO_BLK_S_IOERR;
 			break;
@@ -167,8 +167,8 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 		break;
 
 	default:
-		dev_warn(&vdpasim->vdpa.dev,
-			 "Unsupported request type %d\n", type);
+		dev_dbg(&vdpasim->vdpa.dev,
+			"Unsupported request type %d\n", type);
 		status = VIRTIO_BLK_S_IOERR;
 		break;
 	}
-- 
2.36.1