vfio_pci_private.h

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/*
 * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
 *     Author: Alex Williamson <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Derived from original vfio:
 * Copyright 2010 Cisco Systems, Inc.  All rights reserved.
 * Author: Tom Lyon, [email protected]
 */

#include <linux/mutex.h>
#include <linux/pci.h>

#ifndef VFIO_PCI_PRIVATE_H
#define VFIO_PCI_PRIVATE_H

#define VFIO_PCI_OFFSET_SHIFT   40

#define VFIO_PCI_OFFSET_TO_INDEX(off)   (off >> VFIO_PCI_OFFSET_SHIFT)
#define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
#define VFIO_PCI_OFFSET_MASK    (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)

struct vfio_pci_irq_ctx {
    struct eventfd_ctx  *trigger;
    struct virqfd       *unmask;
    struct virqfd       *mask;
    char            *name;
    bool            masked;
};

struct vfio_pci_device {
    struct pci_dev      *pdev;
    void __iomem        *barmap[PCI_STD_RESOURCE_END + 1];
    u8          *pci_config_map;
    u8          *vconfig;
    struct perm_bits    *msi_perm;
    spinlock_t      irqlock;
    struct mutex        igate;
    struct msix_entry   *msix;
    struct vfio_pci_irq_ctx *ctx;
    int         num_ctx;
    int         irq_type;
    u8          msi_qmax;
    u8          msix_bar;
    u16         msix_size;
    u32         msix_offset;
    u32         rbar[7];
    bool            pci_2_3;
    bool            virq_disabled;
    bool            reset_works;
    bool            extended_caps;
    bool            bardirty;
    struct pci_saved_state  *pci_saved_state;
    atomic_t        refcnt;
};

#define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
#define is_msi(vdev) (vdev->irq_type == VFIO_PCI_MSI_IRQ_INDEX)
#define is_msix(vdev) (vdev->irq_type == VFIO_PCI_MSIX_IRQ_INDEX)
#define is_irq_none(vdev) (!(is_intx(vdev) || is_msi(vdev) || is_msix(vdev)))
#define irq_is(vdev, type) (vdev->irq_type == type)

extern void vfio_pci_intx_mask(struct vfio_pci_device *vdev);
extern void vfio_pci_intx_unmask(struct vfio_pci_device *vdev);

extern int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev,
                   uint32_t flags, unsigned index,
                   unsigned start, unsigned count, void *data);

extern ssize_t vfio_pci_config_readwrite(struct vfio_pci_device *vdev,
                     char __user *buf, size_t count,
                     loff_t *ppos, bool iswrite);
extern ssize_t vfio_pci_mem_readwrite(struct vfio_pci_device *vdev,
                      char __user *buf, size_t count,
                      loff_t *ppos, bool iswrite);
extern ssize_t vfio_pci_io_readwrite(struct vfio_pci_device *vdev,
                     char __user *buf, size_t count,
                     loff_t *ppos, bool iswrite);

extern int vfio_pci_init_perm_bits(void);
extern void vfio_pci_uninit_perm_bits(void);

extern int vfio_pci_virqfd_init(void);
extern void vfio_pci_virqfd_exit(void);

extern int vfio_config_init(struct vfio_pci_device *vdev);
extern void vfio_config_free(struct vfio_pci_device *vdev);
#endif /* VFIO_PCI_PRIVATE_H */