133 lines
4.2 KiB
C
133 lines
4.2 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2017, 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_PCI_H
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#define _VIRTIO_PCI_H
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struct vtpci_interrupt {
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struct resource *vti_irq;
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int vti_rid;
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void *vti_handler;
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};
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struct vtpci_virtqueue {
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struct virtqueue *vtv_vq;
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int vtv_no_intr;
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int vtv_notify_offset;
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};
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struct vtpci_common {
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device_t vtpci_dev;
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uint64_t vtpci_host_features;
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uint64_t vtpci_features;
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struct vtpci_virtqueue *vtpci_vqs;
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int vtpci_nvqs;
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uint32_t vtpci_flags;
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#define VTPCI_FLAG_NO_MSI 0x0001
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#define VTPCI_FLAG_NO_MSIX 0x0002
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#define VTPCI_FLAG_MODERN 0x0004
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#define VTPCI_FLAG_INTX 0x1000
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#define VTPCI_FLAG_MSI 0x2000
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#define VTPCI_FLAG_MSIX 0x4000
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#define VTPCI_FLAG_SHARED_MSIX 0x8000
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#define VTPCI_FLAG_ITYPE_MASK 0xF000
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/* The VirtIO PCI "bus" will only ever have one child. */
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device_t vtpci_child_dev;
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struct virtio_feature_desc *vtpci_child_feat_desc;
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/*
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* Ideally, each virtqueue that the driver provides a callback for will
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* receive its own MSIX vector. If there are not sufficient vectors
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* available, then attempt to have all the VQs share one vector. For
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* MSIX, the configuration changed notifications must be on their own
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* vector.
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*
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* If MSIX is not available, attempt to have the whole device share
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* one MSI vector, and then, finally, one intx interrupt.
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*/
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struct vtpci_interrupt vtpci_device_interrupt;
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struct vtpci_interrupt *vtpci_msix_vq_interrupts;
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int vtpci_nmsix_resources;
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};
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extern int vtpci_disable_msix;
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static inline device_t
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vtpci_child_device(struct vtpci_common *cn)
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{
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return (cn->vtpci_child_dev);
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}
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static inline bool
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vtpci_is_msix_available(struct vtpci_common *cn)
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{
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return ((cn->vtpci_flags & VTPCI_FLAG_NO_MSIX) == 0);
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}
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static inline bool
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vtpci_is_msix_enabled(struct vtpci_common *cn)
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{
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return ((cn->vtpci_flags & VTPCI_FLAG_MSIX) != 0);
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}
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static inline bool
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vtpci_is_modern(struct vtpci_common *cn)
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{
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return ((cn->vtpci_flags & VTPCI_FLAG_MODERN) != 0);
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}
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static inline int
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vtpci_virtqueue_count(struct vtpci_common *cn)
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{
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return (cn->vtpci_nvqs);
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}
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void vtpci_init(struct vtpci_common *cn, device_t dev, bool modern);
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int vtpci_add_child(struct vtpci_common *cn);
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int vtpci_delete_child(struct vtpci_common *cn);
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void vtpci_child_detached(struct vtpci_common *cn);
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int vtpci_reinit(struct vtpci_common *cn);
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uint64_t vtpci_negotiate_features(struct vtpci_common *cn,
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uint64_t child_features, uint64_t host_features);
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int vtpci_with_feature(struct vtpci_common *cn, uint64_t feature);
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int vtpci_read_ivar(struct vtpci_common *cn, int index, uintptr_t *result);
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int vtpci_write_ivar(struct vtpci_common *cn, int index, uintptr_t value);
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int vtpci_alloc_virtqueues(struct vtpci_common *cn, int flags, int nvqs,
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struct vq_alloc_info *vq_info);
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int vtpci_setup_interrupts(struct vtpci_common *cn, enum intr_type type);
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void vtpci_release_child_resources(struct vtpci_common *cn);
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#endif /* _VIRTIO_PCI_H */
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