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fd27ef6b44
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>
131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_VIRTIO_PCI_MODERN_H
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#define _LINUX_VIRTIO_PCI_MODERN_H
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#include <linux/pci.h>
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#include <linux/virtio_pci.h>
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/**
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* struct virtio_pci_modern_device - info for modern PCI virtio
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* @pci_dev: Ptr to the PCI device struct
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* @common: Position of the common capability in the PCI config
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* @device: Device-specific data (non-legacy mode)
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* @notify_base: Base of vq notifications (non-legacy mode)
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* @notify_pa: Physical base of vq notifications
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* @isr: Where to read and clear interrupt
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* @notify_len: So we can sanity-check accesses
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* @device_len: So we can sanity-check accesses
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* @notify_map_cap: Capability for when we need to map notifications per-vq
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* @notify_offset_multiplier: Multiply queue_notify_off by this value
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* (non-legacy mode).
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* @modern_bars: Bitmask of BARs
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* @id: Device and vendor id
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* @device_id_check: Callback defined before vp_modern_probe() to be used to
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* verify the PCI device is a vendor's expected device rather
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* than the standard virtio PCI device
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* Returns the found device id or ERRNO
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* @dma_mask: Optional mask instead of the traditional DMA_BIT_MASK(64),
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* for vendor devices with DMA space address limitations
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*/
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struct virtio_pci_modern_device {
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struct pci_dev *pci_dev;
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struct virtio_pci_common_cfg __iomem *common;
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void __iomem *device;
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void __iomem *notify_base;
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resource_size_t notify_pa;
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u8 __iomem *isr;
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size_t notify_len;
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size_t device_len;
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size_t common_len;
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int notify_map_cap;
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u32 notify_offset_multiplier;
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int modern_bars;
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struct virtio_device_id id;
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int (*device_id_check)(struct pci_dev *pdev);
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u64 dma_mask;
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};
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/*
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* Type-safe wrappers for io accesses.
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* Use these to enforce at compile time the following spec requirement:
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*
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* The driver MUST access each field using the “natural” access
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* method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses
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* for 16-bit fields and 8-bit accesses for 8-bit fields.
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*/
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static inline u8 vp_ioread8(const u8 __iomem *addr)
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{
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return ioread8(addr);
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}
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static inline u16 vp_ioread16 (const __le16 __iomem *addr)
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{
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return ioread16(addr);
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}
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static inline u32 vp_ioread32(const __le32 __iomem *addr)
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{
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return ioread32(addr);
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}
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static inline void vp_iowrite8(u8 value, u8 __iomem *addr)
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{
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iowrite8(value, addr);
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}
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static inline void vp_iowrite16(u16 value, __le16 __iomem *addr)
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{
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iowrite16(value, addr);
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}
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static inline void vp_iowrite32(u32 value, __le32 __iomem *addr)
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{
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iowrite32(value, addr);
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}
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static inline void vp_iowrite64_twopart(u64 val,
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__le32 __iomem *lo,
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__le32 __iomem *hi)
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{
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vp_iowrite32((u32)val, lo);
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vp_iowrite32(val >> 32, hi);
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}
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u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev);
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u64 vp_modern_get_driver_features(struct virtio_pci_modern_device *mdev);
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void vp_modern_set_features(struct virtio_pci_modern_device *mdev,
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u64 features);
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u32 vp_modern_generation(struct virtio_pci_modern_device *mdev);
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u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev);
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void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
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u8 status);
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u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
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u16 idx, u16 vector);
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u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev,
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u16 vector);
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void vp_modern_queue_address(struct virtio_pci_modern_device *mdev,
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u16 index, u64 desc_addr, u64 driver_addr,
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u64 device_addr);
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void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev,
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u16 idx, bool enable);
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bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev,
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u16 idx);
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void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
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u16 idx, u16 size);
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u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
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u16 idx);
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u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev);
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void __iomem * vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
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u16 index, resource_size_t *pa);
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int vp_modern_probe(struct virtio_pci_modern_device *mdev);
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void vp_modern_remove(struct virtio_pci_modern_device *mdev);
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int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
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void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
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u16 vp_modern_avq_num(struct virtio_pci_modern_device *mdev);
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u16 vp_modern_avq_index(struct virtio_pci_modern_device *mdev);
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#endif
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