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virtio_pci.h
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/* * 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/types.h> #ifndef VIRTIO_PCI_NO_LEGACY /* 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 /* 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 /* 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 /* VIRTIO_PCI_NO_LEGACY */ /* The bit of the ISR which indicates a device configuration change. */ #define VIRTIO_PCI_ISR_CONFIG 0x2 /* Vector value used to disable MSI for queue */ #define VIRTIO_MSI_NO_VECTOR 0xffff #ifndef VIRTIO_PCI_NO_MODERN /* IDs for different capabilities. Must all exist. */ /* Common configuration */ #define VIRTIO_PCI_CAP_COMMON_CFG 1 /* Notifications */ #define VIRTIO_PCI_CAP_NOTIFY_CFG 2 /* ISR access */ #define VIRTIO_PCI_CAP_ISR_CFG 3 /* Device specific configuration */ #define VIRTIO_PCI_CAP_DEVICE_CFG 4 /* PCI configuration access */ #define VIRTIO_PCI_CAP_PCI_CFG 5 /* This is the PCI capability header: */ struct virtio_pci_cap { __u8 cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */ __u8 cap_next; /* Generic PCI field: next ptr. */ __u8 cap_len; /* Generic PCI field: capability length */ __u8 cfg_type; /* Identifies the structure. */ __u8 bar; /* Where to find it. */ __u8 padding[3]; /* Pad to full dword. */ __le32 offset; /* Offset within bar. */ __le32 length; /* Length of the structure, in bytes. */ }; struct virtio_pci_notify_cap { struct virtio_pci_cap cap; __le32 notify_off_multiplier; /* Multiplier for queue_notify_off. */ }; /* Fields in VIRTIO_PCI_CAP_COMMON_CFG: */ struct virtio_pci_common_cfg { /* About the whole device. */ __le32 device_feature_select; /* read-write */ __le32 device_feature; /* read-only */ __le32 guest_feature_select; /* read-write */ __le32 guest_feature; /* read-write */ __le16 msix_config; /* read-write */ __le16 num_queues; /* read-only */ __u8 device_status; /* read-write */ __u8 config_generation; /* read-only */ /* About a specific virtqueue. */ __le16 queue_select; /* read-write */ __le16 queue_size; /* read-write, power of 2. */ __le16 queue_msix_vector; /* read-write */ __le16 queue_enable; /* read-write */ __le16 queue_notify_off; /* read-only */ __le32 queue_desc_lo; /* read-write */ __le32 queue_desc_hi; /* read-write */ __le32 queue_avail_lo; /* read-write */ __le32 queue_avail_hi; /* read-write */ __le32 queue_used_lo; /* read-write */ __le32 queue_used_hi; /* read-write */ }; /* Macro versions of offsets for the Old Timers! */ #define VIRTIO_PCI_CAP_VNDR 0 #define VIRTIO_PCI_CAP_NEXT 1 #define VIRTIO_PCI_CAP_LEN 2 #define VIRTIO_PCI_CAP_CFG_TYPE 3 #define VIRTIO_PCI_CAP_BAR 4 #define VIRTIO_PCI_CAP_OFFSET 8 #define VIRTIO_PCI_CAP_LENGTH 12 #define VIRTIO_PCI_NOTIFY_CAP_MULT 16 #define VIRTIO_PCI_COMMON_DFSELECT 0 #define VIRTIO_PCI_COMMON_DF 4 #define VIRTIO_PCI_COMMON_GFSELECT 8 #define VIRTIO_PCI_COMMON_GF 12 #define VIRTIO_PCI_COMMON_MSIX 16 #define VIRTIO_PCI_COMMON_NUMQ 18 #define VIRTIO_PCI_COMMON_STATUS 20 #define VIRTIO_PCI_COMMON_CFGGENERATION 21 #define VIRTIO_PCI_COMMON_Q_SELECT 22 #define VIRTIO_PCI_COMMON_Q_SIZE 24 #define VIRTIO_PCI_COMMON_Q_MSIX 26 #define VIRTIO_PCI_COMMON_Q_ENABLE 28 #define VIRTIO_PCI_COMMON_Q_NOFF 30 #define VIRTIO_PCI_COMMON_Q_DESCLO 32 #define VIRTIO_PCI_COMMON_Q_DESCHI 36 #define VIRTIO_PCI_COMMON_Q_AVAILLO 40 #define VIRTIO_PCI_COMMON_Q_AVAILHI 44 #define VIRTIO_PCI_COMMON_Q_USEDLO 48 #define VIRTIO_PCI_COMMON_Q_USEDHI 52 #endif /* VIRTIO_PCI_NO_MODERN */ #endif