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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. | |
a1b38387 RR |
14 | * |
15 | * Redistribution and use in source and binary forms, with or without | |
16 | * modification, are permitted provided that the following conditions | |
17 | * are met: | |
18 | * 1. Redistributions of source code must retain the above copyright | |
19 | * notice, this list of conditions and the following disclaimer. | |
20 | * 2. Redistributions in binary form must reproduce the above copyright | |
21 | * notice, this list of conditions and the following disclaimer in the | |
22 | * documentation and/or other materials provided with the distribution. | |
23 | * 3. Neither the name of IBM nor the names of its contributors | |
24 | * may be used to endorse or promote products derived from this software | |
25 | * without specific prior written permission. | |
26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND | |
27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
29 | * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE | |
30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
36 | * SUCH DAMAGE. | |
3343660d AL |
37 | */ |
38 | ||
39 | #ifndef _LINUX_VIRTIO_PCI_H | |
40 | #define _LINUX_VIRTIO_PCI_H | |
41 | ||
42 | #include <linux/virtio_config.h> | |
43 | ||
44 | /* A 32-bit r/o bitmask of the features supported by the host */ | |
45 | #define VIRTIO_PCI_HOST_FEATURES 0 | |
46 | ||
47 | /* A 32-bit r/w bitmask of features activated by the guest */ | |
48 | #define VIRTIO_PCI_GUEST_FEATURES 4 | |
49 | ||
50 | /* A 32-bit r/w PFN for the currently selected queue */ | |
51 | #define VIRTIO_PCI_QUEUE_PFN 8 | |
52 | ||
53 | /* A 16-bit r/o queue size for the currently selected queue */ | |
54 | #define VIRTIO_PCI_QUEUE_NUM 12 | |
55 | ||
56 | /* A 16-bit r/w queue selector */ | |
57 | #define VIRTIO_PCI_QUEUE_SEL 14 | |
58 | ||
59 | /* A 16-bit r/w queue notifier */ | |
60 | #define VIRTIO_PCI_QUEUE_NOTIFY 16 | |
61 | ||
62 | /* An 8-bit device status register. */ | |
63 | #define VIRTIO_PCI_STATUS 18 | |
64 | ||
65 | /* An 8-bit r/o interrupt status register. Reading the value will return the | |
66 | * current contents of the ISR and will also clear it. This is effectively | |
67 | * a read-and-acknowledge. */ | |
68 | #define VIRTIO_PCI_ISR 19 | |
69 | ||
70 | /* The bit of the ISR which indicates a device configuration change. */ | |
71 | #define VIRTIO_PCI_ISR_CONFIG 0x2 | |
72 | ||
82af8ce8 MT |
73 | /* MSI-X registers: only enabled if MSI-X is enabled. */ |
74 | /* A 16-bit vector for configuration changes. */ | |
75 | #define VIRTIO_MSI_CONFIG_VECTOR 20 | |
76 | /* A 16-bit vector for selected queue notifications. */ | |
77 | #define VIRTIO_MSI_QUEUE_VECTOR 22 | |
78 | /* Vector value used to disable MSI for queue */ | |
79 | #define VIRTIO_MSI_NO_VECTOR 0xffff | |
80 | ||
3343660d AL |
81 | /* The remaining space is defined by each driver as the per-driver |
82 | * configuration space */ | |
8b21ab14 MT |
83 | #define VIRTIO_PCI_CONFIG_OFF(msix_enabled) ((msix_enabled) ? 24 : 20) |
84 | /* Deprecated: please use VIRTIO_PCI_CONFIG_OFF instead */ | |
85 | #define VIRTIO_PCI_CONFIG(dev) VIRTIO_PCI_CONFIG_OFF((dev)->msix_enabled) | |
3343660d | 86 | |
55a7c066 AL |
87 | /* Virtio ABI version, this must match exactly */ |
88 | #define VIRTIO_PCI_ABI_VERSION 0 | |
480daab4 RR |
89 | |
90 | /* How many bits to shift physical queue address written to QUEUE_PFN. | |
91 | * 12 is historical, and due to x86 page size. */ | |
92 | #define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12 | |
498af147 RR |
93 | |
94 | /* The alignment to use between consumer and producer parts of vring. | |
95 | * x86 pagesize again. */ | |
96 | #define VIRTIO_PCI_VRING_ALIGN 4096 | |
3343660d | 97 | #endif |