uspace/lib/virtio/virtio-pci.h

   1 /*
   2  * Copyright (c) 2018 Jakub Jermar
   3  * All rights reserved.
   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  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - 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  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @file VIRTIO PCI definitions
  30  */
  31
  32 #ifndef _VIRTIO_PCI_H_
  33 #define _VIRTIO_PCI_H_
  34
  35 #include <ddf/driver.h>
  36 #include <pci_dev_iface.h>
  37 #include <ddi.h>
  38
  39 #define VIRTIO_PCI_CAP_CAP_LEN(c)       ((c) + 2)
  40 #define VIRTIO_PCI_CAP_CFG_TYPE(c)      ((c) + 3)
  41 #define VIRTIO_PCI_CAP_BAR(c)           ((c) + 4)
  42 #define VIRTIO_PCI_CAP_OFFSET(c)        ((c) + 8)
  43 #define VIRTIO_PCI_CAP_LENGTH(c)        ((c) + 12)
  44 #define VIRTIO_PCI_CAP_END(c)           ((c) + 16)
  45
  46 #define VIRTIO_PCI_CAP_COMMON_CFG       1
  47 #define VIRTIO_PCI_CAP_NOTIFY_CFG       2
  48 #define VIRTIO_PCI_CAP_ISR_CFG          3
  49 #define VIRTIO_PCI_CAP_DEVICE_CFG       4
  50 #define VIRTIO_PCI_CAP_PCI_CFG          5
  51
  52 #define VIRTIO_DEV_STATUS_RESET                 0
  53 #define VIRTIO_DEV_STATUS_ACKNOWLEDGE           1
  54 #define VIRTIO_DEV_STATUS_DRIVER                2
  55 #define VIRTIO_DEV_STATUS_DRIVER_OK             4
  56 #define VIRTIO_DEV_STATUS_FEATURES_OK           8
  57 #define VIRTIO_DEV_STATUS_DEVICE_NEEDS_RESET    64
  58 #define VIRTIO_DEV_STATUS_FAILED                128
  59
  60 /** Common configuration structure layout according to VIRTIO version 1.0 */
  61 typedef struct virtio_pci_common_cfg {
  62         ioport32_t device_feature_select;
  63         const ioport32_t device_feature;
  64         ioport32_t driver_feature_select;
  65         ioport32_t driver_feature;
  66         ioport16_t msix_config;
  67         const ioport16_t num_queues;
  68         ioport8_t device_status;
  69         const ioport8_t config_generation;
  70         ioport16_t queue_select;
  71         ioport16_t queue_size;
  72         ioport16_t queue_msix_vector;
  73         ioport16_t queue_enable;
  74         const ioport16_t queue_notif_off;
  75         ioport64_t queue_desc;
  76         ioport64_t queue_avail;
  77         ioport64_t queue_used;
  78 } virtio_pci_common_cfg_t;
  79
  80 /** The buffer continues in the next descriptor */
  81 #define VIRTQ_DESC_F_NEXT       1
  82 /** Device write-only buffer */
  83 #define VIRTQ_DESC_F_WRITE      2
  84 /** Buffer contains a list of buffer descriptors */
  85 #define VIRTQ_DESC_F_INDIRECT   4
  86
  87 /** Virtqueue Descriptor structure as per VIRTIO version 1.0 */
  88 typedef struct virtq_desc {
  89         ioport64_t addr;        /**< Buffer physical address */
  90         ioport32_t len;         /**< Buffer length */
  91         ioport16_t flags;       /**< Buffer flags */
  92         ioport16_t next;        /**< Continuation descriptor */
  93 } virtq_desc_t;
  94
  95 #define VIRTQ_AVAIL_F_NO_INTERRUPT      1
  96
  97 /** Virtqueue Available Ring as per VIRTIO version 1.0 */
  98 typedef struct virtq_avail {
  99         ioport16_t flags;
 100         ioport16_t idx;
 101         ioport16_t ring[];
 102         /*
 103          * We do not define the optional used_event member here in order to be
 104          * able to define ring as a variable-length array.
 105          */
 106 } virtq_avail_t;
 107
 108 typedef struct virtq_used_elem {
 109         ioport32_t id;
 110         ioport32_t len;
 111 } virtq_used_elem_t;
 112
 113 #define VIRTQ_USED_F_NO_NOTIFY  1
 114
 115 /** Virtqueue Used Ring as per VIRTIO version 1.0 */
 116 typedef struct virtq_used {
 117         ioport16_t flags;
 118         ioport16_t idx;
 119         virtq_used_elem_t ring[];
 120         /*
 121          * We do not define the optional avail_event member here in order to be
 122          * able to define ring as a variable-length array.
 123          */
 124 } virtq_used_t;
 125
 126 typedef struct {
 127         void *virt;
 128         uintptr_t phys;
 129         size_t size;
 130
 131         /**
 132          * Size of the queue which determines the number of descriptors and
 133          * DMA buffers.
 134          */
 135         size_t queue_size;
 136
 137         /** Virtual address of queue size virtq descriptors */
 138         virtq_desc_t *desc;
 139         /** Virtual address of the available ring */
 140         virtq_avail_t *avail;
 141         /** Virtual address of the used ring */
 142         virtq_used_t *used;
 143
 144         /**
 145          * Queue-size-sized array of virtual addresses of the atcual DMA
 146          * buffers.
 147          */
 148         void **buffers;
 149 } virtq_t;
 150
 151 /** VIRTIO-device specific data associated with the NIC framework nic_t */
 152 typedef struct {
 153         struct {
 154                 bool mapped;
 155                 void *mapped_base;
 156                 size_t mapped_size;
 157         } bar[PCI_BAR_COUNT];
 158
 159         /** Commong configuration structure */
 160         virtio_pci_common_cfg_t *common_cfg;
 161
 162         /** Notification base address */
 163         ioport16_t *notify_base;
 164         /** Notification offset multiplier */
 165         uint32_t notify_off_multiplier;
 166
 167         /** INT#x interrupt ISR register */
 168         ioport8_t *isr;
 169
 170         /** Device-specific configuration */
 171         void *device_cfg;
 172
 173         /** Virtqueues */
 174         virtq_t *queues;
 175 } virtio_dev_t;
 176
 177 extern errno_t virtio_virtq_setup(virtio_dev_t *, uint16_t, uint16_t, size_t,
 178     uint16_t);
 179 extern void virtio_virtq_teardown(virtio_dev_t *, uint16_t);
 180
 181 extern errno_t virtio_pci_dev_initialize(ddf_dev_t *, virtio_dev_t *);
 182 extern errno_t virtio_pci_dev_cleanup(virtio_dev_t *);
 183
 184 #endif
 185
 186 /** @}
 187  */