| /* |
| * 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. |
| */ |
| |
| #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 |
