100 lines
4.1 KiB
C
100 lines
4.1 KiB
C
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#ifndef _LINUX_VIRTIO_CONFIG_H
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#define _LINUX_VIRTIO_CONFIG_H
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/* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
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* anyone can use the definitions to implement compatible drivers/servers.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of IBM nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE. */
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/* Virtio devices use a standardized configuration space to define their
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* features and pass configuration information, but each implementation can
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* store and access that space differently. */
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#include "standard-headers/linux/types.h"
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/* Status byte for guest to report progress, and synchronize features. */
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/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
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#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
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/* We have found a driver for the device. */
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#define VIRTIO_CONFIG_S_DRIVER 2
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/* Driver has used its parts of the config, and is happy */
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#define VIRTIO_CONFIG_S_DRIVER_OK 4
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/* Driver has finished configuring features */
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#define VIRTIO_CONFIG_S_FEATURES_OK 8
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/* Device entered invalid state, driver must reset it */
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#define VIRTIO_CONFIG_S_NEEDS_RESET 0x40
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/* We've given up on this device. */
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#define VIRTIO_CONFIG_S_FAILED 0x80
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/*
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* Virtio feature bits VIRTIO_TRANSPORT_F_START through
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* VIRTIO_TRANSPORT_F_END are reserved for the transport
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* being used (e.g. virtio_ring, virtio_pci etc.), the
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* rest are per-device feature bits.
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*/
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#define VIRTIO_TRANSPORT_F_START 28
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#define VIRTIO_TRANSPORT_F_END 38
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#ifndef VIRTIO_CONFIG_NO_LEGACY
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/* Do we get callbacks when the ring is completely used, even if we've
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* suppressed them? */
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#define VIRTIO_F_NOTIFY_ON_EMPTY 24
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/* Can the device handle any descriptor layout? */
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#define VIRTIO_F_ANY_LAYOUT 27
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#endif /* VIRTIO_CONFIG_NO_LEGACY */
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/* v1.0 compliant. */
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#define VIRTIO_F_VERSION_1 32
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/*
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* If clear - device has the platform DMA (e.g. IOMMU) bypass quirk feature.
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* If set - use platform DMA tools to access the memory.
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*
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* Note the reverse polarity (compared to most other features),
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* this is for compatibility with legacy systems.
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*/
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#define VIRTIO_F_ACCESS_PLATFORM 33
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/* Legacy name for VIRTIO_F_ACCESS_PLATFORM (for compatibility with old userspace) */
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#define VIRTIO_F_IOMMU_PLATFORM VIRTIO_F_ACCESS_PLATFORM
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/* This feature indicates support for the packed virtqueue layout. */
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#define VIRTIO_F_RING_PACKED 34
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/*
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* Inorder feature indicates that all buffers are used by the device
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* in the same order in which they have been made available.
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*/
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#define VIRTIO_F_IN_ORDER 35
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/*
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* This feature indicates that memory accesses by the driver and the
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* device are ordered in a way described by the platform.
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*/
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#define VIRTIO_F_ORDER_PLATFORM 36
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/*
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* Does the device support Single Root I/O Virtualization?
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*/
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#define VIRTIO_F_SR_IOV 37
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#endif /* _LINUX_VIRTIO_CONFIG_H */
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