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authorJason Wang <jasowang@redhat.com>2021-01-04 09:54:53 +0300
committerMichael S. Tsirkin <mst@redhat.com>2021-02-23 15:52:57 +0300
commit3fbda9c1a67522bba5c40e4710c1fa6ab6712d73 (patch)
tree75de9ddf68d972e7d5f86394d413dd8b7911f2c9 /drivers/virtio
parented2a73dbab138b1af8501d48b4f57fa9be68f43c (diff)
downloadlinux-3fbda9c1a67522bba5c40e4710c1fa6ab6712d73.tar.xz
virtio-pci-modern: introduce vp_modern_set_queue_vector()
This patch introduces a helper to set virtqueue MSI vector. Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20210104065503.199631-10-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/virtio_pci_modern.c35
1 files changed, 23 insertions, 12 deletions
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index a128e5814045..05cd409c0731 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -191,6 +191,25 @@ static void vp_modern_set_features(struct virtio_pci_modern_device *mdev,
vp_iowrite32(features >> 32, &cfg->guest_feature);
}
+/*
+ * vp_modern_queue_vector - set the MSIX vector for a specific virtqueue
+ * @mdev: the modern virtio-pci device
+ * @index: queue index
+ * @vector: the config vector
+ *
+ * Returns the config vector read from the device
+ */
+static u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
+ u16 index, u16 vector)
+{
+ struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
+
+ vp_iowrite16(index, &cfg->queue_select);
+ vp_iowrite16(vector, &cfg->queue_msix_vector);
+ /* Flush the write out to device */
+ return vp_ioread16(&cfg->queue_msix_vector);
+}
+
/* virtio config->finalize_features() implementation */
static int vp_finalize_features(struct virtio_device *vdev)
{
@@ -474,8 +493,7 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
}
if (msix_vec != VIRTIO_MSI_NO_VECTOR) {
- vp_iowrite16(msix_vec, &cfg->queue_msix_vector);
- msix_vec = vp_ioread16(&cfg->queue_msix_vector);
+ msix_vec = vp_modern_queue_vector(mdev, index, msix_vec);
if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto err_assign_vector;
@@ -522,17 +540,10 @@ static void del_vq(struct virtio_pci_vq_info *info)
struct virtqueue *vq = info->vq;
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
- struct virtio_pci_common_cfg __iomem *cfg = mdev->common;
-
- vp_iowrite16(vq->index, &cfg->queue_select);
-
- if (vp_dev->msix_enabled) {
- vp_iowrite16(VIRTIO_MSI_NO_VECTOR,
- &cfg->queue_msix_vector);
- /* Flush the write out to device */
- vp_ioread16(&cfg->queue_msix_vector);
- }
+ if (vp_dev->msix_enabled)
+ vp_modern_queue_vector(mdev, vq->index,
+ VIRTIO_MSI_NO_VECTOR);
if (!mdev->notify_base)
pci_iounmap(mdev->pci_dev, (void __force __iomem *)vq->priv);