sys/dev/virtual/virtio/virtio/virtio.h

   1 /*-
   2  * This header is BSD licensed so anyone can use the definitions to implement
   3  * compatible drivers/servers.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of IBM nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sys/dev/virtio/virtio.h,v 1.2 2011/12/06 06:28:32 grehan Exp $
  29  */
  30
  31 #ifndef _VIRTIO_H_
  32 #define _VIRTIO_H_
  33
  34 #include <sys/types.h>
  35 #include <sys/serialize.h>
  36
  37 struct vq_alloc_info;
  38
  39 /* VirtIO device IDs. */
  40 #define VIRTIO_ID_NETWORK       0x01
  41 #define VIRTIO_ID_BLOCK         0x02
  42 #define VIRTIO_ID_CONSOLE       0x03
  43 #define VIRTIO_ID_ENTROPY       0x04
  44 #define VIRTIO_ID_BALLOON       0x05
  45 #define VIRTIO_ID_IOMEMORY      0x06
  46 #define VIRTIO_ID_9P            0x09
  47
  48 /* Status byte for guest to report progress. */
  49 #define VIRTIO_CONFIG_STATUS_RESET      0x00
  50 #define VIRTIO_CONFIG_STATUS_ACK        0x01
  51 #define VIRTIO_CONFIG_STATUS_DRIVER     0x02
  52 #define VIRTIO_CONFIG_STATUS_DRIVER_OK  0x04
  53 #define VIRTIO_CONFIG_STATUS_FAILED     0x80
  54
  55 /*
  56  * Generate interrupt when the virtqueue ring is
  57  * completely used, even if we've suppressed them.
  58  */
  59 #define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24)
  60
  61 /*
  62  * The guest should never negotiate this feature; it
  63  * is used to detect faulty drivers.
  64  */
  65 #define VIRTIO_F_BAD_FEATURE (1 << 30)
  66
  67 /*
  68  * Some VirtIO feature bits (currently bits 28 through 31) are
  69  * reserved for the transport being used (eg. virtio_ring), the
  70  * rest are per-device feature bits.
  71  */
  72 #define VIRTIO_TRANSPORT_F_START        28
  73 #define VIRTIO_TRANSPORT_F_END          32
  74
  75 /*
  76  * Maximum number of virtqueues per device.
  77  */
  78 #define VIRTIO_MAX_VIRTQUEUES 8
  79
  80 /*
  81  * VirtIO instance variables indices.
  82  */
  83 #define VIRTIO_IVAR_DEVTYPE             1
  84 #define VIRTIO_IVAR_FEATURE_DESC        2
  85
  86 struct virtio_feature_desc {
  87         uint64_t         vfd_val;
  88         const char      *vfd_str;
  89 };
  90
  91 const char *virtio_device_name(uint16_t devid);
  92 int      virtio_get_device_type(device_t dev);
  93 void     virtio_set_feature_desc(device_t dev,
  94              struct virtio_feature_desc *feature_desc);
  95 void     virtio_describe(device_t dev, const char *msg,
  96              uint64_t features, struct virtio_feature_desc *feature_desc);
  97
  98 /*
  99  * VirtIO Bus Methods.
 100  */
 101 uint64_t virtio_negotiate_features(device_t dev, uint64_t child_features);
 102 int      virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
 103              struct vq_alloc_info *info);
 104 int      virtio_setup_intr(device_t dev, lwkt_serialize_t);
 105 int      virtio_with_feature(device_t dev, uint64_t feature);
 106 void     virtio_stop(device_t dev);
 107 int      virtio_reinit(device_t dev, uint64_t features);
 108 void     virtio_reinit_complete(device_t dev);
 109
 110 /*
 111  * Read/write a variable amount from the device specific (ie, network)
 112  * configuration region. This region is encoded in the same endian as
 113  * the guest.
 114  */
 115 void     virtio_read_device_config(device_t dev, bus_size_t offset,
 116              void *dst, int length);
 117 void     virtio_write_device_config(device_t dev, bus_size_t offset,
 118              void *src, int length);
 119
 120 /* Inlined device specific read/write functions for common lengths. */
 121 #define VIRTIO_RDWR_DEVICE_CONFIG(size, type)                           \
 122 static inline type                                                      \
 123 __CONCAT(virtio_read_dev_config_,size)(device_t dev,                    \
 124     bus_size_t offset)                                                  \
 125 {                                                                       \
 126         type val;                                                       \
 127         virtio_read_device_config(dev, offset, &val, sizeof(type));     \
 128         return (val);                                                   \
 129 }                                                                       \
 130                                                                         \
 131 static inline void                                                      \
 132 __CONCAT(virtio_write_dev_config_,size)(device_t dev,                   \
 133     bus_size_t offset, type val)                                        \
 134 {                                                                       \
 135         virtio_write_device_config(dev, offset, &val, sizeof(type));    \
 136 }
 137
 138 VIRTIO_RDWR_DEVICE_CONFIG(1, uint8_t);
 139 VIRTIO_RDWR_DEVICE_CONFIG(2, uint16_t);
 140 VIRTIO_RDWR_DEVICE_CONFIG(4, uint32_t);
 141
 142 #endif /* _VIRTIO_H_ */