98 lines
3.8 KiB
C
98 lines
3.8 KiB
C
/*
|
|
* Virtio PCI driver
|
|
*
|
|
* This module allows virtio devices to be used over a virtual PCI device.
|
|
* This can be used with QEMU based VMMs like KVM or Xen.
|
|
*
|
|
* Copyright IBM Corp. 2007
|
|
*
|
|
* Authors:
|
|
* Anthony Liguori <aliguori@us.ibm.com>
|
|
*
|
|
* This header is BSD licensed so anyone can use the definitions to implement
|
|
* compatible drivers/servers.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of IBM nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _LINUX_VIRTIO_PCI_H
|
|
#define _LINUX_VIRTIO_PCI_H
|
|
|
|
#include <linux/virtio_config.h>
|
|
|
|
/* A 32-bit r/o bitmask of the features supported by the host */
|
|
#define VIRTIO_PCI_HOST_FEATURES 0
|
|
|
|
/* A 32-bit r/w bitmask of features activated by the guest */
|
|
#define VIRTIO_PCI_GUEST_FEATURES 4
|
|
|
|
/* A 32-bit r/w PFN for the currently selected queue */
|
|
#define VIRTIO_PCI_QUEUE_PFN 8
|
|
|
|
/* A 16-bit r/o queue size for the currently selected queue */
|
|
#define VIRTIO_PCI_QUEUE_NUM 12
|
|
|
|
/* A 16-bit r/w queue selector */
|
|
#define VIRTIO_PCI_QUEUE_SEL 14
|
|
|
|
/* A 16-bit r/w queue notifier */
|
|
#define VIRTIO_PCI_QUEUE_NOTIFY 16
|
|
|
|
/* An 8-bit device status register. */
|
|
#define VIRTIO_PCI_STATUS 18
|
|
|
|
/* An 8-bit r/o interrupt status register. Reading the value will return the
|
|
* current contents of the ISR and will also clear it. This is effectively
|
|
* a read-and-acknowledge. */
|
|
#define VIRTIO_PCI_ISR 19
|
|
|
|
/* The bit of the ISR which indicates a device configuration change. */
|
|
#define VIRTIO_PCI_ISR_CONFIG 0x2
|
|
|
|
/* MSI-X registers: only enabled if MSI-X is enabled. */
|
|
/* A 16-bit vector for configuration changes. */
|
|
#define VIRTIO_MSI_CONFIG_VECTOR 20
|
|
/* A 16-bit vector for selected queue notifications. */
|
|
#define VIRTIO_MSI_QUEUE_VECTOR 22
|
|
/* Vector value used to disable MSI for queue */
|
|
#define VIRTIO_MSI_NO_VECTOR 0xffff
|
|
|
|
/* The remaining space is defined by each driver as the per-driver
|
|
* configuration space */
|
|
#define VIRTIO_PCI_CONFIG_OFF(msix_enabled) ((msix_enabled) ? 24 : 20)
|
|
/* Deprecated: please use VIRTIO_PCI_CONFIG_OFF instead */
|
|
#define VIRTIO_PCI_CONFIG(dev) VIRTIO_PCI_CONFIG_OFF((dev)->msix_enabled)
|
|
|
|
/* Virtio ABI version, this must match exactly */
|
|
#define VIRTIO_PCI_ABI_VERSION 0
|
|
|
|
/* How many bits to shift physical queue address written to QUEUE_PFN.
|
|
* 12 is historical, and due to x86 page size. */
|
|
#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
|
|
|
|
/* The alignment to use between consumer and producer parts of vring.
|
|
* x86 pagesize again. */
|
|
#define VIRTIO_PCI_VRING_ALIGN 4096
|
|
#endif
|