| /* | |
| * 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(dev) ((dev)->msix_enabled ? 24 : 20) | |
| /* 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 |