2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2014, Bryan Venteicher <bryanv@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
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.
34 #include <dev/virtio/virtio_endian.h>
35 #include <dev/virtio/virtio_ids.h>
36 #include <dev/virtio/virtio_config.h>
44 * Each virtqueue indirect descriptor list must be physically contiguous.
45 * To allow us to malloc(9) each list individually, limit the number
46 * supported to what will fit in one page. With 4KB pages, this is a limit
47 * of 256 descriptors. If there is ever a need for more, we can switch to
48 * contigmalloc(9) for the larger allocations, similar to what
49 * bus_dmamem_alloc(9) does.
51 * Note the sizeof(struct vring_desc) is 16 bytes.
53 #define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
56 * VirtIO instance variables indices.
58 #define VIRTIO_IVAR_DEVTYPE 1
59 #define VIRTIO_IVAR_FEATURE_DESC 2
60 #define VIRTIO_IVAR_VENDOR 3
61 #define VIRTIO_IVAR_DEVICE 4
62 #define VIRTIO_IVAR_SUBVENDOR 5
63 #define VIRTIO_IVAR_SUBDEVICE 6
64 #define VIRTIO_IVAR_MODERN 7
66 struct virtio_feature_desc {
71 #define VIRTIO_DRIVER_MODULE(name, driver, devclass, evh, arg) \
72 DRIVER_MODULE(name, virtio_mmio, driver, devclass, evh, arg); \
73 DRIVER_MODULE(name, virtio_pci, driver, devclass, evh, arg)
75 struct virtio_pnp_match {
77 const char *description;
79 #define VIRTIO_SIMPLE_PNPINFO(driver, devtype, desc) \
80 static const struct virtio_pnp_match driver ## _match = { \
81 .device_type = devtype, \
82 .description = desc, \
84 MODULE_PNP_INFO("U32:device_type;D:#", virtio_mmio, driver, \
85 &driver ## _match, 1); \
86 MODULE_PNP_INFO("U32:device_type;D:#", virtio_pci, driver, \
88 #define VIRTIO_SIMPLE_PROBE(dev, driver) \
89 (virtio_simple_probe(dev, &driver ## _match))
91 const char *virtio_device_name(uint16_t devid);
92 void virtio_describe(device_t dev, const char *msg,
93 uint64_t features, struct virtio_feature_desc *desc);
94 int virtio_describe_sbuf(struct sbuf *sb, uint64_t features,
95 struct virtio_feature_desc *desc);
96 uint64_t virtio_filter_transport_features(uint64_t features);
97 int virtio_bus_is_modern(device_t dev);
98 void virtio_read_device_config_array(device_t dev, bus_size_t offset,
99 void *dst, int size, int count);
102 * VirtIO Bus Methods.
104 void virtio_read_ivar(device_t dev, int ivar, uintptr_t *val);
105 void virtio_write_ivar(device_t dev, int ivar, uintptr_t val);
106 uint64_t virtio_negotiate_features(device_t dev, uint64_t child_features);
107 int virtio_finalize_features(device_t dev);
108 int virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
109 struct vq_alloc_info *info);
110 int virtio_setup_intr(device_t dev, enum intr_type type);
111 int virtio_with_feature(device_t dev, uint64_t feature);
112 void virtio_stop(device_t dev);
113 int virtio_config_generation(device_t dev);
114 int virtio_reinit(device_t dev, uint64_t features);
115 void virtio_reinit_complete(device_t dev);
116 int virtio_child_pnpinfo(device_t busdev, device_t child, struct sbuf *sb);
119 * Read/write a variable amount from the device specific (ie, network)
120 * configuration region. This region is encoded in the same endian as
123 void virtio_read_device_config(device_t dev, bus_size_t offset,
124 void *dst, int length);
125 void virtio_write_device_config(device_t dev, bus_size_t offset,
126 const void *src, int length);
128 /* Inlined device specific read/write functions for common lengths. */
129 #define VIRTIO_RDWR_DEVICE_CONFIG(size, type) \
131 __CONCAT(virtio_read_dev_config_,size)(device_t dev, \
135 virtio_read_device_config(dev, offset, &val, sizeof(type)); \
140 __CONCAT(virtio_write_dev_config_,size)(device_t dev, \
141 bus_size_t offset, type val) \
143 virtio_write_device_config(dev, offset, &val, sizeof(type)); \
146 VIRTIO_RDWR_DEVICE_CONFIG(1, uint8_t);
147 VIRTIO_RDWR_DEVICE_CONFIG(2, uint16_t);
148 VIRTIO_RDWR_DEVICE_CONFIG(4, uint32_t);
150 #undef VIRTIO_RDWR_DEVICE_CONFIG
152 #define VIRTIO_READ_IVAR(name, ivar) \
154 __CONCAT(virtio_get_,name)(device_t dev) \
157 virtio_read_ivar(dev, ivar, &val); \
158 return ((int) val); \
161 VIRTIO_READ_IVAR(device_type, VIRTIO_IVAR_DEVTYPE);
162 VIRTIO_READ_IVAR(vendor, VIRTIO_IVAR_VENDOR);
163 VIRTIO_READ_IVAR(device, VIRTIO_IVAR_DEVICE);
164 VIRTIO_READ_IVAR(subvendor, VIRTIO_IVAR_SUBVENDOR);
165 VIRTIO_READ_IVAR(subdevice, VIRTIO_IVAR_SUBDEVICE);
166 VIRTIO_READ_IVAR(modern, VIRTIO_IVAR_MODERN);
168 #undef VIRTIO_READ_IVAR
170 #define VIRTIO_WRITE_IVAR(name, ivar) \
172 __CONCAT(virtio_set_,name)(device_t dev, void *val) \
174 virtio_write_ivar(dev, ivar, (uintptr_t) val); \
177 VIRTIO_WRITE_IVAR(feature_desc, VIRTIO_IVAR_FEATURE_DESC);
179 #undef VIRTIO_WRITE_IVAR
182 virtio_simple_probe(device_t dev, const struct virtio_pnp_match *match)
185 if (virtio_get_device_type(dev) != match->device_type)
187 device_set_desc(dev, match->description);
188 return (BUS_PROBE_DEFAULT);
193 #endif /* _VIRTIO_H_ */