89e1f7d4c6
Add PCI device support for VFIO. PCI devices expose regions for accessing config space, I/O port space, and MMIO areas of the device. PCI config access is virtualized in the kernel, allowing us to ensure the integrity of the system, by preventing various accesses while reducing duplicate support across various userspace drivers. I/O port supports read/write access while MMIO also supports mmap of sufficiently sized regions. Support for INTx, MSI, and MSI-X interrupts are provided using eventfds to userspace. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*
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* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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* Author: Alex Williamson <alex.williamson@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Derived from original vfio:
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* Copyright 2010 Cisco Systems, Inc. All rights reserved.
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* Author: Tom Lyon, pugs@cisco.com
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*/
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#include <linux/mutex.h>
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#include <linux/pci.h>
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#ifndef VFIO_PCI_PRIVATE_H
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#define VFIO_PCI_PRIVATE_H
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#define VFIO_PCI_OFFSET_SHIFT 40
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#define VFIO_PCI_OFFSET_TO_INDEX(off) (off >> VFIO_PCI_OFFSET_SHIFT)
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#define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
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#define VFIO_PCI_OFFSET_MASK (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
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struct vfio_pci_irq_ctx {
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struct eventfd_ctx *trigger;
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struct virqfd *unmask;
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struct virqfd *mask;
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char *name;
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bool masked;
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};
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struct vfio_pci_device {
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struct pci_dev *pdev;
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void __iomem *barmap[PCI_STD_RESOURCE_END + 1];
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u8 *pci_config_map;
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u8 *vconfig;
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struct perm_bits *msi_perm;
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spinlock_t irqlock;
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struct mutex igate;
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struct msix_entry *msix;
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struct vfio_pci_irq_ctx *ctx;
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int num_ctx;
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int irq_type;
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u8 msi_qmax;
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u8 msix_bar;
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u16 msix_size;
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u32 msix_offset;
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u32 rbar[7];
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bool pci_2_3;
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bool virq_disabled;
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bool reset_works;
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bool extended_caps;
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bool bardirty;
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struct pci_saved_state *pci_saved_state;
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atomic_t refcnt;
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};
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#define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
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#define is_msi(vdev) (vdev->irq_type == VFIO_PCI_MSI_IRQ_INDEX)
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#define is_msix(vdev) (vdev->irq_type == VFIO_PCI_MSIX_IRQ_INDEX)
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#define is_irq_none(vdev) (!(is_intx(vdev) || is_msi(vdev) || is_msix(vdev)))
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#define irq_is(vdev, type) (vdev->irq_type == type)
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extern void vfio_pci_intx_mask(struct vfio_pci_device *vdev);
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extern void vfio_pci_intx_unmask(struct vfio_pci_device *vdev);
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extern int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev,
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uint32_t flags, unsigned index,
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unsigned start, unsigned count, void *data);
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extern ssize_t vfio_pci_config_readwrite(struct vfio_pci_device *vdev,
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char __user *buf, size_t count,
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loff_t *ppos, bool iswrite);
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extern ssize_t vfio_pci_mem_readwrite(struct vfio_pci_device *vdev,
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char __user *buf, size_t count,
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loff_t *ppos, bool iswrite);
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extern ssize_t vfio_pci_io_readwrite(struct vfio_pci_device *vdev,
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char __user *buf, size_t count,
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loff_t *ppos, bool iswrite);
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extern int vfio_pci_init_perm_bits(void);
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extern void vfio_pci_uninit_perm_bits(void);
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extern int vfio_pci_virqfd_init(void);
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extern void vfio_pci_virqfd_exit(void);
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extern int vfio_config_init(struct vfio_pci_device *vdev);
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extern void vfio_config_free(struct vfio_pci_device *vdev);
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#endif /* VFIO_PCI_PRIVATE_H */
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