include/standard-headers/linux/virtio_config.h

   1 #ifndef _LINUX_VIRTIO_CONFIG_H
   2 #define _LINUX_VIRTIO_CONFIG_H
   3 /* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
   4  * anyone can use the definitions to implement compatible drivers/servers.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of IBM nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE. */
  28
  29 /* Virtio devices use a standardized configuration space to define their
  30  * features and pass configuration information, but each implementation can
  31  * store and access that space differently. */
  32 #include "standard-headers/linux/types.h"
  33
  34 /* Status byte for guest to report progress, and synchronize features. */
  35 /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
  36 #define VIRTIO_CONFIG_S_ACKNOWLEDGE     1
  37 /* We have found a driver for the device. */
  38 #define VIRTIO_CONFIG_S_DRIVER          2
  39 /* Driver has used its parts of the config, and is happy */
  40 #define VIRTIO_CONFIG_S_DRIVER_OK       4
  41 /* Driver has finished configuring features */
  42 #define VIRTIO_CONFIG_S_FEATURES_OK     8
  43 /* Device entered invalid state, driver must reset it */
  44 #define VIRTIO_CONFIG_S_NEEDS_RESET     0x40
  45 /* We've given up on this device. */
  46 #define VIRTIO_CONFIG_S_FAILED          0x80
  47
  48 /*
  49  * Virtio feature bits VIRTIO_TRANSPORT_F_START through
  50  * VIRTIO_TRANSPORT_F_END are reserved for the transport
  51  * being used (e.g. virtio_ring, virtio_pci etc.), the
  52  * rest are per-device feature bits.
  53  */
  54 #define VIRTIO_TRANSPORT_F_START        28
  55 #define VIRTIO_TRANSPORT_F_END          38
  56
  57 #ifndef VIRTIO_CONFIG_NO_LEGACY
  58 /* Do we get callbacks when the ring is completely used, even if we've
  59  * suppressed them? */
  60 #define VIRTIO_F_NOTIFY_ON_EMPTY        24
  61
  62 /* Can the device handle any descriptor layout? */
  63 #define VIRTIO_F_ANY_LAYOUT             27
  64 #endif /* VIRTIO_CONFIG_NO_LEGACY */
  65
  66 /* v1.0 compliant. */
  67 #define VIRTIO_F_VERSION_1              32
  68
  69 /*
  70  * If clear - device has the platform DMA (e.g. IOMMU) bypass quirk feature.
  71  * If set - use platform DMA tools to access the memory.
  72  *
  73  * Note the reverse polarity (compared to most other features),
  74  * this is for compatibility with legacy systems.
  75  */
  76 #define VIRTIO_F_ACCESS_PLATFORM        33
  77 /* Legacy name for VIRTIO_F_ACCESS_PLATFORM (for compatibility with old userspace) */
  78 #define VIRTIO_F_IOMMU_PLATFORM         VIRTIO_F_ACCESS_PLATFORM
  79
  80 /* This feature indicates support for the packed virtqueue layout. */
  81 #define VIRTIO_F_RING_PACKED            34
  82
  83 /*
  84  * This feature indicates that memory accesses by the driver and the
  85  * device are ordered in a way described by the platform.
  86  */
  87 #define VIRTIO_F_ORDER_PLATFORM         36
  88
  89 /*
  90  * Does the device support Single Root I/O Virtualization?
  91  */
  92 #define VIRTIO_F_SR_IOV                 37
  93 #endif /* _LINUX_VIRTIO_CONFIG_H */