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Release 4.7 include/uapi/linux/virtio_pci.h

Directory: include/uapi/linux
/*
 * 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_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 /* 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 */
};

/* Fields in VIRTIO_PCI_CAP_PCI_CFG: */

struct virtio_pci_cfg_cap {
	
struct virtio_pci_cap cap;
	
__u8 pci_cfg_data[4]; /* Data for BAR access. */
};

/* 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

Overall Contributors
PersonTokensPropCommitsCommitProp
rusty russellrusty russell27667.98%642.86%


michael s. tsirkinmichael s. tsirkin7117.49%642.86%


anthony liguorianthony liguori5914.53%214.29%


Total406100.00%14100.00%

  
Directory: include/uapi/linux



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