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1 /*
2  * Copyright (C) 2012 Red Hat, Inc.  All rights reserved.
3  *     Author: Alex Williamson <alex.williamson@redhat.com>
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License version 2 as
7  * published by the Free Software Foundation.
8  *
9  * Derived from original vfio:
10  * Copyright 2010 Cisco Systems, Inc.  All rights reserved.
11  * Author: Tom Lyon, pugs@cisco.com
12  */
13 
14 #include <linux/mutex.h>
15 #include <linux/pci.h>
16 #include <linux/irqbypass.h>
17 
18 #ifndef VFIO_PCI_PRIVATE_H
19 #define VFIO_PCI_PRIVATE_H
20 
21 #define VFIO_PCI_OFFSET_SHIFT   40
22 
23 #define VFIO_PCI_OFFSET_TO_INDEX(off)	(off >> VFIO_PCI_OFFSET_SHIFT)
24 #define VFIO_PCI_INDEX_TO_OFFSET(index)	((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
25 #define VFIO_PCI_OFFSET_MASK	(((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
26 
27 struct vfio_pci_irq_ctx {
28 	struct eventfd_ctx	*trigger;
29 	struct virqfd		*unmask;
30 	struct virqfd		*mask;
31 	char			*name;
32 	bool			masked;
33 	struct irq_bypass_producer	producer;
34 };
35 
36 struct vfio_pci_device {
37 	struct pci_dev		*pdev;
38 	void __iomem		*barmap[PCI_STD_RESOURCE_END + 1];
39 	u8			*pci_config_map;
40 	u8			*vconfig;
41 	struct perm_bits	*msi_perm;
42 	spinlock_t		irqlock;
43 	struct mutex		igate;
44 	struct msix_entry	*msix;
45 	struct vfio_pci_irq_ctx	*ctx;
46 	int			num_ctx;
47 	int			irq_type;
48 	u8			msi_qmax;
49 	u8			msix_bar;
50 	u16			msix_size;
51 	u32			msix_offset;
52 	u32			rbar[7];
53 	bool			pci_2_3;
54 	bool			virq_disabled;
55 	bool			reset_works;
56 	bool			extended_caps;
57 	bool			bardirty;
58 	bool			has_vga;
59 	bool			needs_reset;
60 	struct pci_saved_state	*pci_saved_state;
61 	int			refcnt;
62 	struct eventfd_ctx	*err_trigger;
63 	struct eventfd_ctx	*req_trigger;
64 };
65 
66 #define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
67 #define is_msi(vdev) (vdev->irq_type == VFIO_PCI_MSI_IRQ_INDEX)
68 #define is_msix(vdev) (vdev->irq_type == VFIO_PCI_MSIX_IRQ_INDEX)
69 #define is_irq_none(vdev) (!(is_intx(vdev) || is_msi(vdev) || is_msix(vdev)))
70 #define irq_is(vdev, type) (vdev->irq_type == type)
71 
72 extern void vfio_pci_intx_mask(struct vfio_pci_device *vdev);
73 extern void vfio_pci_intx_unmask(struct vfio_pci_device *vdev);
74 
75 extern int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev,
76 				   uint32_t flags, unsigned index,
77 				   unsigned start, unsigned count, void *data);
78 
79 extern ssize_t vfio_pci_config_rw(struct vfio_pci_device *vdev,
80 				  char __user *buf, size_t count,
81 				  loff_t *ppos, bool iswrite);
82 
83 extern ssize_t vfio_pci_bar_rw(struct vfio_pci_device *vdev, char __user *buf,
84 			       size_t count, loff_t *ppos, bool iswrite);
85 
86 extern ssize_t vfio_pci_vga_rw(struct vfio_pci_device *vdev, char __user *buf,
87 			       size_t count, loff_t *ppos, bool iswrite);
88 
89 extern int vfio_pci_init_perm_bits(void);
90 extern void vfio_pci_uninit_perm_bits(void);
91 
92 extern int vfio_config_init(struct vfio_pci_device *vdev);
93 extern void vfio_config_free(struct vfio_pci_device *vdev);
94 #endif /* VFIO_PCI_PRIVATE_H */
95