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3343660d AL |
1 | /* |
2 | * Virtio PCI driver | |
3 | * | |
4 | * This module allows virtio devices to be used over a virtual PCI device. | |
5 | * This can be used with QEMU based VMMs like KVM or Xen. | |
6 | * | |
7 | * Copyright IBM Corp. 2007 | |
8 | * | |
9 | * Authors: | |
10 | * Anthony Liguori <aliguori@us.ibm.com> | |
11 | * | |
674bfc23 RR |
12 | * This header is BSD licensed so anyone can use the definitions to implement |
13 | * compatible drivers/servers. | |
3343660d AL |
14 | */ |
15 | ||
16 | #ifndef _LINUX_VIRTIO_PCI_H | |
17 | #define _LINUX_VIRTIO_PCI_H | |
18 | ||
19 | #include <linux/virtio_config.h> | |
20 | ||
21 | /* A 32-bit r/o bitmask of the features supported by the host */ | |
22 | #define VIRTIO_PCI_HOST_FEATURES 0 | |
23 | ||
24 | /* A 32-bit r/w bitmask of features activated by the guest */ | |
25 | #define VIRTIO_PCI_GUEST_FEATURES 4 | |
26 | ||
27 | /* A 32-bit r/w PFN for the currently selected queue */ | |
28 | #define VIRTIO_PCI_QUEUE_PFN 8 | |
29 | ||
30 | /* A 16-bit r/o queue size for the currently selected queue */ | |
31 | #define VIRTIO_PCI_QUEUE_NUM 12 | |
32 | ||
33 | /* A 16-bit r/w queue selector */ | |
34 | #define VIRTIO_PCI_QUEUE_SEL 14 | |
35 | ||
36 | /* A 16-bit r/w queue notifier */ | |
37 | #define VIRTIO_PCI_QUEUE_NOTIFY 16 | |
38 | ||
39 | /* An 8-bit device status register. */ | |
40 | #define VIRTIO_PCI_STATUS 18 | |
41 | ||
42 | /* An 8-bit r/o interrupt status register. Reading the value will return the | |
43 | * current contents of the ISR and will also clear it. This is effectively | |
44 | * a read-and-acknowledge. */ | |
45 | #define VIRTIO_PCI_ISR 19 | |
46 | ||
47 | /* The bit of the ISR which indicates a device configuration change. */ | |
48 | #define VIRTIO_PCI_ISR_CONFIG 0x2 | |
49 | ||
82af8ce8 MT |
50 | /* MSI-X registers: only enabled if MSI-X is enabled. */ |
51 | /* A 16-bit vector for configuration changes. */ | |
52 | #define VIRTIO_MSI_CONFIG_VECTOR 20 | |
53 | /* A 16-bit vector for selected queue notifications. */ | |
54 | #define VIRTIO_MSI_QUEUE_VECTOR 22 | |
55 | /* Vector value used to disable MSI for queue */ | |
56 | #define VIRTIO_MSI_NO_VECTOR 0xffff | |
57 | ||
3343660d AL |
58 | /* The remaining space is defined by each driver as the per-driver |
59 | * configuration space */ | |
82af8ce8 | 60 | #define VIRTIO_PCI_CONFIG(dev) ((dev)->msix_enabled ? 24 : 20) |
3343660d | 61 | |
55a7c066 AL |
62 | /* Virtio ABI version, this must match exactly */ |
63 | #define VIRTIO_PCI_ABI_VERSION 0 | |
480daab4 RR |
64 | |
65 | /* How many bits to shift physical queue address written to QUEUE_PFN. | |
66 | * 12 is historical, and due to x86 page size. */ | |
67 | #define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12 | |
498af147 RR |
68 | |
69 | /* The alignment to use between consumer and producer parts of vring. | |
70 | * x86 pagesize again. */ | |
71 | #define VIRTIO_PCI_VRING_ALIGN 4096 | |
3343660d | 72 | #endif |