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virtio-pci: Introduce admin virtqueue

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Introduce support for the admin virtqueue. By negotiating
VIRTIO_F_ADMIN_VQ feature, driver detects capability and creates one
administration virtqueue. Administration virtqueue implementation in
virtio pci generic layer, enables multiple types of upper layer
drivers such as vfio, net, blk to utilize it.

Signed-off-by: Feng Liu <feliu@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20231219093247.170936-3-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Feng Liu
2023-12-19 11:32:40 +02:00
committed by Alex Williamson
parent 838bebb4c9
commit fd27ef6b44
8 changed files with 157 additions and 8 deletions
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24
drivers/virtio/virtio_pci_modern_dev.c
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@@ -207,6 +207,10 @@ static inline void check_offsets(void)
offsetof(struct virtio_pci_modern_common_cfg, queue_notify_data));
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_RESET !=
offsetof(struct virtio_pci_modern_common_cfg, queue_reset));
BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_IDX !=
offsetof(struct virtio_pci_modern_common_cfg, admin_queue_index));
BUILD_BUG_ON(VIRTIO_PCI_COMMON_ADM_Q_NUM !=
offsetof(struct virtio_pci_modern_common_cfg, admin_queue_num));
}
/*
@@ -296,7 +300,7 @@ int vp_modern_probe(struct virtio_pci_modern_device *mdev)
mdev->common = vp_modern_map_capability(mdev, common,
sizeof(struct virtio_pci_common_cfg), 4, 0,
offsetofend(struct virtio_pci_modern_common_cfg,
queue_reset),
admin_queue_num),
&mdev->common_len, NULL);
if (!mdev->common)
goto err_map_common;
@@ -719,6 +723,24 @@ void __iomem *vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
}
EXPORT_SYMBOL_GPL(vp_modern_map_vq_notify);
u16 vp_modern_avq_num(struct virtio_pci_modern_device *mdev)
{
struct virtio_pci_modern_common_cfg __iomem *cfg;
cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
return vp_ioread16(&cfg->admin_queue_num);
}
EXPORT_SYMBOL_GPL(vp_modern_avq_num);
u16 vp_modern_avq_index(struct virtio_pci_modern_device *mdev)
{
struct virtio_pci_modern_common_cfg __iomem *cfg;
cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
return vp_ioread16(&cfg->admin_queue_index);
}
EXPORT_SYMBOL_GPL(vp_modern_avq_index);
MODULE_VERSION("0.1");
MODULE_DESCRIPTION("Modern Virtio PCI Device");
MODULE_AUTHOR("Jason Wang <jasowang@redhat.com>");