kernel
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linux-6.8.1/include/linux
130
linux-6.8.1/include/linux/virtio_pci_modern.h
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130
linux-6.8.1/include/linux/virtio_pci_modern.h
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/* 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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