include/standard-headers/linux/virtio_config.h - qemu - Git at Google

 #ifndef _LINUX_VIRTIO_CONFIG_H
 #define _LINUX_VIRTIO_CONFIG_H
 /* This header, excluding the #ifdef __KERNEL__ part, 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. */

 /* Virtio devices use a standardized configuration space to define their
  * features and pass configuration information, but each implementation can
  * store and access that space differently. */
 #include "standard-headers/linux/types.h"

 /* Status byte for guest to report progress, and synchronize features. */
 /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
 #define VIRTIO_CONFIG_S_ACKNOWLEDGE	1
 /* We have found a driver for the device. */
 #define VIRTIO_CONFIG_S_DRIVER		2
 /* Driver has used its parts of the config, and is happy */
 #define VIRTIO_CONFIG_S_DRIVER_OK	4
 /* Driver has finished configuring features */
 #define VIRTIO_CONFIG_S_FEATURES_OK	8
 /* Device entered invalid state, driver must reset it */
 #define VIRTIO_CONFIG_S_NEEDS_RESET	0x40
 /* We've given up on this device. */
 #define VIRTIO_CONFIG_S_FAILED		0x80

 /*
  * Virtio feature bits VIRTIO_TRANSPORT_F_START through
  * VIRTIO_TRANSPORT_F_END are reserved for the transport
  * being used (e.g. virtio_ring, virtio_pci etc.), the
  * rest are per-device feature bits.
  */
 #define VIRTIO_TRANSPORT_F_START	28
 #define VIRTIO_TRANSPORT_F_END		41

 #ifndef VIRTIO_CONFIG_NO_LEGACY
 /* Do we get callbacks when the ring is completely used, even if we've
  * suppressed them? */
 #define VIRTIO_F_NOTIFY_ON_EMPTY	24

 /* Can the device handle any descriptor layout? */
 #define VIRTIO_F_ANY_LAYOUT		27
 #endif /* VIRTIO_CONFIG_NO_LEGACY */

 /* v1.0 compliant. */
 #define VIRTIO_F_VERSION_1		32

 /*
  * If clear - device has the platform DMA (e.g. IOMMU) bypass quirk feature.
  * If set - use platform DMA tools to access the memory.
  *
  * Note the reverse polarity (compared to most other features),
  * this is for compatibility with legacy systems.
  */
 #define VIRTIO_F_ACCESS_PLATFORM	33
 /* Legacy name for VIRTIO_F_ACCESS_PLATFORM (for compatibility with old userspace) */
 #define VIRTIO_F_IOMMU_PLATFORM		VIRTIO_F_ACCESS_PLATFORM

 /* This feature indicates support for the packed virtqueue layout. */
 #define VIRTIO_F_RING_PACKED		34

 /*
  * Inorder feature indicates that all buffers are used by the device
  * in the same order in which they have been made available.
  */
 #define VIRTIO_F_IN_ORDER		35

 /*
  * This feature indicates that memory accesses by the driver and the
  * device are ordered in a way described by the platform.
  */
 #define VIRTIO_F_ORDER_PLATFORM		36

 /*
  * Does the device support Single Root I/O Virtualization?
  */
 #define VIRTIO_F_SR_IOV			37

 /*
  * This feature indicates that the driver passes extra data (besides
  * identifying the virtqueue) in its device notifications.
  */
 #define VIRTIO_F_NOTIFICATION_DATA	38

 /*
  * This feature indicates that the driver can reset a queue individually.
  */
 #define VIRTIO_F_RING_RESET		40
 #endif /* _LINUX_VIRTIO_CONFIG_H */
	#ifndef _LINUX_VIRTIO_CONFIG_H
	#define _LINUX_VIRTIO_CONFIG_H
	/* This header, excluding the #ifdef __KERNEL__ part, 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. */

	/* Virtio devices use a standardized configuration space to define their
	* features and pass configuration information, but each implementation can
	* store and access that space differently. */
	#include "standard-headers/linux/types.h"

	/* Status byte for guest to report progress, and synchronize features. */
	/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
	#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
	/* We have found a driver for the device. */
	#define VIRTIO_CONFIG_S_DRIVER 2
	/* Driver has used its parts of the config, and is happy */
	#define VIRTIO_CONFIG_S_DRIVER_OK 4
	/* Driver has finished configuring features */
	#define VIRTIO_CONFIG_S_FEATURES_OK 8
	/* Device entered invalid state, driver must reset it */
	#define VIRTIO_CONFIG_S_NEEDS_RESET 0x40
	/* We've given up on this device. */
	#define VIRTIO_CONFIG_S_FAILED 0x80

	/*
	* Virtio feature bits VIRTIO_TRANSPORT_F_START through
	* VIRTIO_TRANSPORT_F_END are reserved for the transport
	* being used (e.g. virtio_ring, virtio_pci etc.), the
	* rest are per-device feature bits.
	*/
	#define VIRTIO_TRANSPORT_F_START 28
	#define VIRTIO_TRANSPORT_F_END 41

	#ifndef VIRTIO_CONFIG_NO_LEGACY
	/* Do we get callbacks when the ring is completely used, even if we've
	* suppressed them? */
	#define VIRTIO_F_NOTIFY_ON_EMPTY 24

	/* Can the device handle any descriptor layout? */
	#define VIRTIO_F_ANY_LAYOUT 27
	#endif /* VIRTIO_CONFIG_NO_LEGACY */

	/* v1.0 compliant. */
	#define VIRTIO_F_VERSION_1 32

	/*
	* If clear - device has the platform DMA (e.g. IOMMU) bypass quirk feature.
	* If set - use platform DMA tools to access the memory.
	*
	* Note the reverse polarity (compared to most other features),
	* this is for compatibility with legacy systems.
	*/
	#define VIRTIO_F_ACCESS_PLATFORM 33
	/* Legacy name for VIRTIO_F_ACCESS_PLATFORM (for compatibility with old userspace) */
	#define VIRTIO_F_IOMMU_PLATFORM VIRTIO_F_ACCESS_PLATFORM

	/* This feature indicates support for the packed virtqueue layout. */
	#define VIRTIO_F_RING_PACKED 34

	/*
	* Inorder feature indicates that all buffers are used by the device
	* in the same order in which they have been made available.
	*/
	#define VIRTIO_F_IN_ORDER 35

	/*
	* This feature indicates that memory accesses by the driver and the
	* device are ordered in a way described by the platform.
	*/
	#define VIRTIO_F_ORDER_PLATFORM 36

	/*
	* Does the device support Single Root I/O Virtualization?
	*/
	#define VIRTIO_F_SR_IOV 37

	/*
	* This feature indicates that the driver passes extra data (besides
	* identifying the virtqueue) in its device notifications.
	*/
	#define VIRTIO_F_NOTIFICATION_DATA 38

	/*
	* This feature indicates that the driver can reset a queue individually.
	*/
	#define VIRTIO_F_RING_RESET 40
	#endif /* _LINUX_VIRTIO_CONFIG_H */