985ed053e3
VirtIO buses (PCI, MMIO) can provide a generation field so a driver can ensure either a 64-bit or array read was stable. MFC after: 2 weeks
148 lines
4.9 KiB
C
148 lines
4.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2014, Bryan Venteicher <bryanv@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _VIRTIO_H_
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#define _VIRTIO_H_
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#include <dev/virtio/virtio_ids.h>
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#include <dev/virtio/virtio_config.h>
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struct vq_alloc_info;
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/*
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* Each virtqueue indirect descriptor list must be physically contiguous.
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* To allow us to malloc(9) each list individually, limit the number
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* supported to what will fit in one page. With 4KB pages, this is a limit
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* of 256 descriptors. If there is ever a need for more, we can switch to
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* contigmalloc(9) for the larger allocations, similar to what
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* bus_dmamem_alloc(9) does.
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*
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* Note the sizeof(struct vring_desc) is 16 bytes.
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*/
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#define VIRTIO_MAX_INDIRECT ((int) (PAGE_SIZE / 16))
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/*
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* VirtIO instance variables indices.
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*/
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#define VIRTIO_IVAR_DEVTYPE 1
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#define VIRTIO_IVAR_FEATURE_DESC 2
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#define VIRTIO_IVAR_VENDOR 3
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#define VIRTIO_IVAR_DEVICE 4
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#define VIRTIO_IVAR_SUBVENDOR 5
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#define VIRTIO_IVAR_SUBDEVICE 6
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struct virtio_feature_desc {
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uint64_t vfd_val;
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const char *vfd_str;
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};
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const char *virtio_device_name(uint16_t devid);
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void virtio_describe(device_t dev, const char *msg,
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uint64_t features, struct virtio_feature_desc *feature_desc);
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/*
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* VirtIO Bus Methods.
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*/
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void virtio_read_ivar(device_t dev, int ivar, uintptr_t *val);
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void virtio_write_ivar(device_t dev, int ivar, uintptr_t val);
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uint64_t virtio_negotiate_features(device_t dev, uint64_t child_features);
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int virtio_alloc_virtqueues(device_t dev, int flags, int nvqs,
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struct vq_alloc_info *info);
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int virtio_setup_intr(device_t dev, enum intr_type type);
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int virtio_with_feature(device_t dev, uint64_t feature);
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void virtio_stop(device_t dev);
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int virtio_config_generation(device_t dev);
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int virtio_reinit(device_t dev, uint64_t features);
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void virtio_reinit_complete(device_t dev);
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/*
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* Read/write a variable amount from the device specific (ie, network)
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* configuration region. This region is encoded in the same endian as
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* the guest.
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*/
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void virtio_read_device_config(device_t dev, bus_size_t offset,
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void *dst, int length);
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void virtio_write_device_config(device_t dev, bus_size_t offset,
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void *src, int length);
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/* Inlined device specific read/write functions for common lengths. */
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#define VIRTIO_RDWR_DEVICE_CONFIG(size, type) \
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static inline type \
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__CONCAT(virtio_read_dev_config_,size)(device_t dev, \
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bus_size_t offset) \
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{ \
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type val; \
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virtio_read_device_config(dev, offset, &val, sizeof(type)); \
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return (val); \
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} \
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\
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static inline void \
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__CONCAT(virtio_write_dev_config_,size)(device_t dev, \
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bus_size_t offset, type val) \
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{ \
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virtio_write_device_config(dev, offset, &val, sizeof(type)); \
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}
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VIRTIO_RDWR_DEVICE_CONFIG(1, uint8_t);
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VIRTIO_RDWR_DEVICE_CONFIG(2, uint16_t);
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VIRTIO_RDWR_DEVICE_CONFIG(4, uint32_t);
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#undef VIRTIO_RDWR_DEVICE_CONFIG
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#define VIRTIO_READ_IVAR(name, ivar) \
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static inline int \
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__CONCAT(virtio_get_,name)(device_t dev) \
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{ \
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uintptr_t val; \
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virtio_read_ivar(dev, ivar, &val); \
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return ((int) val); \
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}
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VIRTIO_READ_IVAR(device_type, VIRTIO_IVAR_DEVTYPE);
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VIRTIO_READ_IVAR(vendor, VIRTIO_IVAR_VENDOR);
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VIRTIO_READ_IVAR(device, VIRTIO_IVAR_DEVICE);
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VIRTIO_READ_IVAR(subvendor, VIRTIO_IVAR_SUBVENDOR);
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VIRTIO_READ_IVAR(subdevice, VIRTIO_IVAR_SUBDEVICE);
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#undef VIRTIO_READ_IVAR
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#define VIRTIO_WRITE_IVAR(name, ivar) \
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static inline void \
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__CONCAT(virtio_set_,name)(device_t dev, void *val) \
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{ \
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virtio_write_ivar(dev, ivar, (uintptr_t) val); \
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}
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VIRTIO_WRITE_IVAR(feature_desc, VIRTIO_IVAR_FEATURE_DESC);
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#undef VIRTIO_WRITE_IVAR
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#endif /* _VIRTIO_H_ */
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