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>
42 * Each virtqueue indirect descriptor list must be physically contiguous.
43 * To allow us to malloc(9) each list individually, limit the number
44 * supported to what will fit in one page. With 4KB pages, this is a limit
45 * of 256 descriptors. If there is ever a need for more, we can switch to
46 * contigmalloc(9) for the larger allocations, similar to what
47 * bus_dmamem_alloc(9) does.
49 * Note the sizeof(struct vring_desc) is 16 bytes.
51 #define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
54 * VirtIO instance variables indices.
56 #define VIRTIO_IVAR_DEVTYPE 1
57 #define VIRTIO_IVAR_FEATURE_DESC 2
58 #define VIRTIO_IVAR_VENDOR 3
59 #define VIRTIO_IVAR_DEVICE 4
60 #define VIRTIO_IVAR_SUBVENDOR 5
61 #define VIRTIO_IVAR_SUBDEVICE 6
62 #define VIRTIO_IVAR_MODERN 7
64 struct virtio_feature_desc {
69 #define VIRTIO_DRIVER_MODULE(name, driver, devclass, evh, arg) \
70 DRIVER_MODULE(name, virtio_mmio, driver, devclass, evh, arg); \
71 DRIVER_MODULE(name, virtio_pci, driver, devclass, evh, arg)
73 struct virtio_pnp_match {
75 const char *description;
77 #define VIRTIO_SIMPLE_PNPINFO(driver, devtype, desc) \
78 static const struct virtio_pnp_match driver ## _match = { \
79 .device_type = devtype, \
80 .description = desc, \
82 MODULE_PNP_INFO("U32:device_type;D:#", virtio_mmio, driver, \
83 &driver ## _match, 1); \
84 MODULE_PNP_INFO("U32:device_type;D:#", virtio_pci, driver, \
86 #define VIRTIO_SIMPLE_PROBE(dev, driver) \
87 (virtio_simple_probe(dev, &driver ## _match))
89 const char *virtio_device_name(uint16_t devid);
90 void virtio_describe(device_t dev, const char *msg,
91 uint64_t features, struct virtio_feature_desc *desc);
92 int virtio_describe_sbuf(struct sbuf *sb, uint64_t features,
93 struct virtio_feature_desc *desc);
94 uint64_t virtio_filter_transport_features(uint64_t features);
95 int virtio_bus_is_modern(device_t dev);
96 void virtio_read_device_config_array(device_t dev, bus_size_t offset,
97 void *dst, int size, int count);
100 * VirtIO Bus Methods.
102 void virtio_read_ivar(device_t dev, int ivar, uintptr_t *val);
103 void virtio_write_ivar(device_t dev, int ivar, uintptr_t val);
104 uint64_t virtio_negotiate_features(device_t dev, uint64_t child_features);
105 int virtio_finalize_features(device_t dev);
106 int virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
107 struct vq_alloc_info *info);
108 int virtio_setup_intr(device_t dev, enum intr_type type);
109 int virtio_with_feature(device_t dev, uint64_t feature);
110 void virtio_stop(device_t dev);
111 int virtio_config_generation(device_t dev);
112 int virtio_reinit(device_t dev, uint64_t features);
113 void virtio_reinit_complete(device_t dev);
114 int virtio_child_pnpinfo_str(device_t busdev, device_t child, char *buf,
118 * Read/write a variable amount from the device specific (ie, network)
119 * configuration region. This region is encoded in the same endian as
122 void virtio_read_device_config(device_t dev, bus_size_t offset,
123 void *dst, int length);
124 void virtio_write_device_config(device_t dev, bus_size_t offset,
125 void *src, int length);
127 /* Inlined device specific read/write functions for common lengths. */
128 #define VIRTIO_RDWR_DEVICE_CONFIG(size, type) \
130 __CONCAT(virtio_read_dev_config_,size)(device_t dev, \
134 virtio_read_device_config(dev, offset, &val, sizeof(type)); \
139 __CONCAT(virtio_write_dev_config_,size)(device_t dev, \
140 bus_size_t offset, type val) \
142 virtio_write_device_config(dev, offset, &val, sizeof(type)); \
145 VIRTIO_RDWR_DEVICE_CONFIG(1, uint8_t);
146 VIRTIO_RDWR_DEVICE_CONFIG(2, uint16_t);
147 VIRTIO_RDWR_DEVICE_CONFIG(4, uint32_t);
149 #undef VIRTIO_RDWR_DEVICE_CONFIG
151 #define VIRTIO_READ_IVAR(name, ivar) \
153 __CONCAT(virtio_get_,name)(device_t dev) \
156 virtio_read_ivar(dev, ivar, &val); \
157 return ((int) val); \
160 VIRTIO_READ_IVAR(device_type, VIRTIO_IVAR_DEVTYPE);
161 VIRTIO_READ_IVAR(vendor, VIRTIO_IVAR_VENDOR);
162 VIRTIO_READ_IVAR(device, VIRTIO_IVAR_DEVICE);
163 VIRTIO_READ_IVAR(subvendor, VIRTIO_IVAR_SUBVENDOR);
164 VIRTIO_READ_IVAR(subdevice, VIRTIO_IVAR_SUBDEVICE);
165 VIRTIO_READ_IVAR(modern, VIRTIO_IVAR_MODERN);
167 #undef VIRTIO_READ_IVAR
169 #define VIRTIO_WRITE_IVAR(name, ivar) \
171 __CONCAT(virtio_set_,name)(device_t dev, void *val) \
173 virtio_write_ivar(dev, ivar, (uintptr_t) val); \
176 VIRTIO_WRITE_IVAR(feature_desc, VIRTIO_IVAR_FEATURE_DESC);
178 #undef VIRTIO_WRITE_IVAR
181 virtio_simple_probe(device_t dev, const struct virtio_pnp_match *match)
184 if (virtio_get_device_type(dev) != match->device_type)
186 device_set_desc(dev, match->description);
187 return (BUS_PROBE_DEFAULT);
190 #endif /* _VIRTIO_H_ */