45383fb0f4
This patch introduces the support for VIRTIO_F_ORDER_PLATFORM. If this feature is negotiated, the driver must use the barriers suitable for hardware devices. Otherwise, the device and driver are assumed to be implemented in software, that is they can be assumed to run on identical CPUs in an SMP configuration. Thus a weaker form of memory barriers is sufficient to yield better performance. It is recommended that an add-in card based PCI device offers this feature for portability. The device will fail to operate further or will operate in a slower emulation mode if this feature is offered but not accepted. Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
92 lines
3.8 KiB
C
92 lines
3.8 KiB
C
#ifndef _UAPI_LINUX_VIRTIO_CONFIG_H
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#define _UAPI_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 <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 IOMMU bypass quirk feature.
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* If set - use platform tools to detect the IOMMU.
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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_IOMMU_PLATFORM 33
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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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* 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 /* _UAPI_LINUX_VIRTIO_CONFIG_H */
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