linux-kernel - [PATCH V3 08/19] virtio-pci-modern: introduce vp_modern

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Date:   Mon,  4 Jan 2021 14:54:52 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     shahafs@...lanox.com, lulu@...hat.com, sgarzare@...hat.com,
        rdunlap@...radead.org, Jason Wang <jasowang@...hat.com>
Subject: [PATCH V3 08/19] virtio-pci-modern: introduce vp_modern_generation()

This patch introduces vp_modern_generation() to get device generation.

Signed-off-by: Jason Wang <jasowang@...hat.com>
---
 drivers/virtio/virtio_pci_modern.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index cb14fc334a9c..a128e5814045 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -289,15 +289,26 @@ static void vp_set(struct virtio_device *vdev, unsigned offset,
 	}
 }
 
-static u32 vp_generation(struct virtio_device *vdev)
+/*
+ * vp_modern_generation - get the device genreation
+ * @mdev: the modern virtio-pci device
+ *
+ * Returns the genreation read from device
+ */
+static u32 vp_modern_generation(struct virtio_pci_modern_device *mdev)
 {
-	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
-	struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
 	struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
 
 	return vp_ioread8(&cfg->config_generation);
 }
 
+static u32 vp_generation(struct virtio_device *vdev)
+{
+	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+
+	return vp_modern_generation(&vp_dev->mdev);
+}
+
 /*
  * vp_modern_get_status - get the device status
  * @mdev: the modern virtio-pci device
-- 
2.25.1