virtio_pci.h
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/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com>
*
* From Linux kernel include/uapi/linux/virtio_pci.h
*/
#ifndef _LINUX_VIRTIO_PCI_H
#define _LINUX_VIRTIO_PCI_H
#ifndef VIRTIO_PCI_NO_LEGACY
/* A 32-bit r/o bitmask of the features supported by the host */
#define VIRTIO_PCI_HOST_FEATURES 0
/* A 32-bit r/w bitmask of features activated by the guest */
#define VIRTIO_PCI_GUEST_FEATURES 4
/* A 32-bit r/w PFN for the currently selected queue */
#define VIRTIO_PCI_QUEUE_PFN 8
/* A 16-bit r/o queue size for the currently selected queue */
#define VIRTIO_PCI_QUEUE_NUM 12
/* A 16-bit r/w queue selector */
#define VIRTIO_PCI_QUEUE_SEL 14
/* A 16-bit r/w queue notifier */
#define VIRTIO_PCI_QUEUE_NOTIFY 16
/* An 8-bit device status register */
#define VIRTIO_PCI_STATUS 18
/*
* An 8-bit r/o interrupt status register. Reading the value will return the
* current contents of the ISR and will also clear it. This is effectively
* a read-and-acknowledge.
*/
#define VIRTIO_PCI_ISR 19
/* MSI-X registers: only enabled if MSI-X is enabled */
/* A 16-bit vector for configuration changes */
#define VIRTIO_MSI_CONFIG_VECTOR 20
/* A 16-bit vector for selected queue notifications */
#define VIRTIO_MSI_QUEUE_VECTOR 22
/*
* The remaining space is defined by each driver as the per-driver
* configuration space
*/
#define VIRTIO_PCI_CONFIG_OFF(msix) ((msix) ? 24 : 20)
/* Virtio ABI version, this must match exactly */
#define VIRTIO_PCI_ABI_VERSION 0
/*
* How many bits to shift physical queue address written to QUEUE_PFN.
* 12 is historical, and due to x86 page size.
*/
#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
/*
* The alignment to use between consumer and producer parts of vring.
* x86 pagesize again.
*/
#define VIRTIO_PCI_VRING_ALIGN 4096
#endif /* VIRTIO_PCI_NO_LEGACY */
/* The bit of the ISR which indicates a device configuration change */
#define VIRTIO_PCI_ISR_CONFIG 0x2
/* Vector value used to disable MSI for queue */
#define VIRTIO_MSI_NO_VECTOR 0xffff
#ifndef VIRTIO_PCI_NO_MODERN
/* IDs for different capabilities. Must all exist. */
/* Common configuration */
#define VIRTIO_PCI_CAP_COMMON_CFG 1
/* Notifications */
#define VIRTIO_PCI_CAP_NOTIFY_CFG 2
/* ISR access */
#define VIRTIO_PCI_CAP_ISR_CFG 3
/* Device specific configuration */
#define VIRTIO_PCI_CAP_DEVICE_CFG 4
/* PCI configuration access */
#define VIRTIO_PCI_CAP_PCI_CFG 5
/* This is the PCI capability header: */
struct virtio_pci_cap {
__u8 cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
__u8 cap_next; /* Generic PCI field: next ptr */
__u8 cap_len; /* Generic PCI field: capability length */
__u8 cfg_type; /* Identifies the structure */
__u8 bar; /* Where to find it */
__u8 padding[3]; /* Pad to full dword */
__le32 offset; /* Offset within bar */
__le32 length; /* Length of the structure, in bytes */
};
struct virtio_pci_notify_cap {
struct virtio_pci_cap cap;
__le32 notify_off_multiplier; /* Multiplier for queue_notify_off */
};
/* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */
struct virtio_pci_common_cfg {
/* About the whole device */
__le32 device_feature_select; /* read-write */
__le32 device_feature; /* read-only */
__le32 guest_feature_select; /* read-write */
__le32 guest_feature; /* read-write */
__le16 msix_config; /* read-write */
__le16 num_queues; /* read-only */
__u8 device_status; /* read-write */
__u8 config_generation; /* read-only */
/* About a specific virtqueue */
__le16 queue_select; /* read-write */
__le16 queue_size; /* read-write, power of 2 */
__le16 queue_msix_vector; /* read-write */
__le16 queue_enable; /* read-write */
__le16 queue_notify_off; /* read-only */
__le32 queue_desc_lo; /* read-write */
__le32 queue_desc_hi; /* read-write */
__le32 queue_avail_lo; /* read-write */
__le32 queue_avail_hi; /* read-write */
__le32 queue_used_lo; /* read-write */
__le32 queue_used_hi; /* read-write */
};
/* Fields in VIRTIO_PCI_CAP_PCI_CFG: */
struct virtio_pci_cfg_cap {
struct virtio_pci_cap cap;
__u8 pci_cfg_data[4]; /* Data for BAR access */
};
/* Macro versions of offsets for the Old Timers! */
#define VIRTIO_PCI_CAP_VNDR 0
#define VIRTIO_PCI_CAP_NEXT 1
#define VIRTIO_PCI_CAP_LEN 2
#define VIRTIO_PCI_CAP_CFG_TYPE 3
#define VIRTIO_PCI_CAP_BAR 4
#define VIRTIO_PCI_CAP_OFFSET 8
#define VIRTIO_PCI_CAP_LENGTH 12
#define VIRTIO_PCI_NOTIFY_CAP_MULT 16
#define VIRTIO_PCI_COMMON_DFSELECT 0
#define VIRTIO_PCI_COMMON_DF 4
#define VIRTIO_PCI_COMMON_GFSELECT 8
#define VIRTIO_PCI_COMMON_GF 12
#define VIRTIO_PCI_COMMON_MSIX 16
#define VIRTIO_PCI_COMMON_NUMQ 18
#define VIRTIO_PCI_COMMON_STATUS 20
#define VIRTIO_PCI_COMMON_CFGGENERATION 21
#define VIRTIO_PCI_COMMON_Q_SELECT 22
#define VIRTIO_PCI_COMMON_Q_SIZE 24
#define VIRTIO_PCI_COMMON_Q_MSIX 26
#define VIRTIO_PCI_COMMON_Q_ENABLE 28
#define VIRTIO_PCI_COMMON_Q_NOFF 30
#define VIRTIO_PCI_COMMON_Q_DESCLO 32
#define VIRTIO_PCI_COMMON_Q_DESCHI 36
#define VIRTIO_PCI_COMMON_Q_AVAILLO 40
#define VIRTIO_PCI_COMMON_Q_AVAILHI 44
#define VIRTIO_PCI_COMMON_Q_USEDLO 48
#define VIRTIO_PCI_COMMON_Q_USEDHI 52
#endif /* VIRTIO_PCI_NO_MODERN */
#endif /* _LINUX_VIRTIO_PCI_H */