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From: Mike Christie <michael.christie@oracle.com>
To: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org,
	mst@redhat.com, jasowang@redhat.com, pbonzini@redhat.com,
	stefanha@redhat.com, virtualization@lists.linux-foundation.org
Subject: [PATCH 1/5] vhost: add helper to check if a vq has been setup
Date: Tue, 10 Nov 2020 05:33:19 +0000
Message-ID: <1604986403-4931-2-git-send-email-michael.christie@oracle.com> (raw)
In-Reply-To: <1604986403-4931-1-git-send-email-michael.christie@oracle.com>

This adds a helper check if a vq has been setup. The next patches
will use this when we move the vhost scsi cmd preallocation from per
session to per vq. In the per vq case, we only want to allocate cmds
for vqs that have actually been setup and not for all the possible
vqs.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/vhost/vhost.c | 6 ++++++
 drivers/vhost/vhost.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 5c835a2..a262e12 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -304,6 +304,12 @@ static void vhost_vring_call_reset(struct vhost_vring_call *call_ctx)
 	memset(&call_ctx->producer, 0x0, sizeof(struct irq_bypass_producer));
 }
 
+bool vhost_vq_is_setup(struct vhost_virtqueue *vq)
+{
+	return vq->avail && vq->desc && vq->used && vhost_vq_access_ok(vq);
+}
+EXPORT_SYMBOL_GPL(vhost_vq_is_setup);
+
 static void vhost_vq_reset(struct vhost_dev *dev,
 			   struct vhost_virtqueue *vq)
 {
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index e016cd3..b063324 100644
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -190,6 +190,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *,
 		      struct vhost_log *log, unsigned int *log_num);
 void vhost_discard_vq_desc(struct vhost_virtqueue *, int n);
 
+bool vhost_vq_is_setup(struct vhost_virtqueue *vq);
 int vhost_vq_init_access(struct vhost_virtqueue *);
 int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len);
 int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads,
-- 
1.8.3.1

  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-10  5:33 [PATCH 0/5 V5] vhost-scsi: IO error fixups Mike Christie
2020-11-10  5:33 ` Mike Christie [this message]
2020-11-10  7:20   ` [PATCH 1/5] vhost: add helper to check if a vq has been setup Jason Wang
2020-11-10  5:33 ` [PATCH 2/5] vhost scsi: alloc cmds per vq instead of session Mike Christie
2020-11-12 17:11   ` Maurizio Lombardi
2020-11-10  5:33 ` [PATCH 3/5] vhost scsi: fix cmd completion race Mike Christie
2020-11-10  5:33 ` [PATCH 4/5] vhost scsi: add lun parser helper Mike Christie
2020-11-10  5:33 ` [PATCH 5/5] vhost scsi: Add support for LUN resets Mike Christie
2020-11-12 17:00 ` [PATCH 0/5 V5] vhost-scsi: IO error fixups Stefan Hajnoczi

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