6c4f95161d
No functional change intended, but noticed that we could add const here while adding linuxkpi support for virtio. Reviewed By: bryanv, imp Differential Revision: https://reviews.freebsd.org/D32370
776 lines
20 KiB
C
776 lines
20 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2011, 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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/* Driver for the legacy VirtIO PCI interface. */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/lock.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/endian.h>
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#include <dev/virtio/virtio.h>
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#include <dev/virtio/virtqueue.h>
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#include <dev/virtio/pci/virtio_pci.h>
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#include <dev/virtio/pci/virtio_pci_legacy_var.h>
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#include "virtio_bus_if.h"
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#include "virtio_pci_if.h"
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#include "virtio_if.h"
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struct vtpci_legacy_softc {
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device_t vtpci_dev;
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struct vtpci_common vtpci_common;
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int vtpci_res_type;
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struct resource *vtpci_res;
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struct resource *vtpci_msix_table_res;
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struct resource *vtpci_msix_pba_res;
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};
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static int vtpci_legacy_probe(device_t);
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static int vtpci_legacy_attach(device_t);
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static int vtpci_legacy_detach(device_t);
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static int vtpci_legacy_suspend(device_t);
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static int vtpci_legacy_resume(device_t);
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static int vtpci_legacy_shutdown(device_t);
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static void vtpci_legacy_driver_added(device_t, driver_t *);
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static void vtpci_legacy_child_detached(device_t, device_t);
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static int vtpci_legacy_read_ivar(device_t, device_t, int, uintptr_t *);
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static int vtpci_legacy_write_ivar(device_t, device_t, int, uintptr_t);
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static uint8_t vtpci_legacy_read_isr(device_t);
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static uint16_t vtpci_legacy_get_vq_size(device_t, int);
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static bus_size_t vtpci_legacy_get_vq_notify_off(device_t, int);
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static void vtpci_legacy_set_vq(device_t, struct virtqueue *);
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static void vtpci_legacy_disable_vq(device_t, int);
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static int vtpci_legacy_register_cfg_msix(device_t,
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struct vtpci_interrupt *);
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static int vtpci_legacy_register_vq_msix(device_t, int idx,
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struct vtpci_interrupt *);
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static uint64_t vtpci_legacy_negotiate_features(device_t, uint64_t);
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static int vtpci_legacy_with_feature(device_t, uint64_t);
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static int vtpci_legacy_alloc_virtqueues(device_t, int, int,
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struct vq_alloc_info *);
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static int vtpci_legacy_setup_interrupts(device_t, enum intr_type);
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static void vtpci_legacy_stop(device_t);
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static int vtpci_legacy_reinit(device_t, uint64_t);
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static void vtpci_legacy_reinit_complete(device_t);
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static void vtpci_legacy_notify_vq(device_t, uint16_t, bus_size_t);
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static void vtpci_legacy_read_dev_config(device_t, bus_size_t, void *, int);
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static void vtpci_legacy_write_dev_config(device_t, bus_size_t, const void *, int);
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static bool vtpci_legacy_setup_msix(struct vtpci_legacy_softc *sc);
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static void vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc);
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static int vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *);
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static void vtpci_legacy_free_resources(struct vtpci_legacy_softc *);
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static void vtpci_legacy_probe_and_attach_child(struct vtpci_legacy_softc *);
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static uint8_t vtpci_legacy_get_status(struct vtpci_legacy_softc *);
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static void vtpci_legacy_set_status(struct vtpci_legacy_softc *, uint8_t);
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static void vtpci_legacy_select_virtqueue(struct vtpci_legacy_softc *, int);
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static void vtpci_legacy_reset(struct vtpci_legacy_softc *);
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#define VIRTIO_PCI_LEGACY_CONFIG(_sc) \
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VIRTIO_PCI_CONFIG_OFF(vtpci_is_msix_enabled(&(_sc)->vtpci_common))
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#define vtpci_legacy_read_config_1(sc, o) \
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bus_read_1((sc)->vtpci_res, (o))
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#define vtpci_legacy_write_config_1(sc, o, v) \
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bus_write_1((sc)->vtpci_res, (o), (v))
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/*
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* VirtIO specifies that PCI Configuration area is guest endian. However,
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* since PCI devices are inherently little-endian, on big-endian systems
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* the bus layer transparently converts it to BE. For virtio-legacy, this
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* conversion is undesired, so an extra byte swap is required to fix it.
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*/
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#define vtpci_legacy_read_config_2(sc, o) \
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le16toh(bus_read_2((sc)->vtpci_res, (o)))
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#define vtpci_legacy_read_config_4(sc, o) \
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le32toh(bus_read_4((sc)->vtpci_res, (o)))
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#define vtpci_legacy_write_config_2(sc, o, v) \
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bus_write_2((sc)->vtpci_res, (o), (htole16(v)))
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#define vtpci_legacy_write_config_4(sc, o, v) \
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bus_write_4((sc)->vtpci_res, (o), (htole32(v)))
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/* PCI Header LE. On BE systems the bus layer takes care of byte swapping. */
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#define vtpci_legacy_read_header_2(sc, o) \
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bus_read_2((sc)->vtpci_res, (o))
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#define vtpci_legacy_read_header_4(sc, o) \
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bus_read_4((sc)->vtpci_res, (o))
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#define vtpci_legacy_write_header_2(sc, o, v) \
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bus_write_2((sc)->vtpci_res, (o), (v))
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#define vtpci_legacy_write_header_4(sc, o, v) \
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bus_write_4((sc)->vtpci_res, (o), (v))
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static device_method_t vtpci_legacy_methods[] = {
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/* Device interface. */
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DEVMETHOD(device_probe, vtpci_legacy_probe),
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DEVMETHOD(device_attach, vtpci_legacy_attach),
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DEVMETHOD(device_detach, vtpci_legacy_detach),
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DEVMETHOD(device_suspend, vtpci_legacy_suspend),
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DEVMETHOD(device_resume, vtpci_legacy_resume),
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DEVMETHOD(device_shutdown, vtpci_legacy_shutdown),
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/* Bus interface. */
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DEVMETHOD(bus_driver_added, vtpci_legacy_driver_added),
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DEVMETHOD(bus_child_detached, vtpci_legacy_child_detached),
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DEVMETHOD(bus_child_pnpinfo, virtio_child_pnpinfo),
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DEVMETHOD(bus_read_ivar, vtpci_legacy_read_ivar),
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DEVMETHOD(bus_write_ivar, vtpci_legacy_write_ivar),
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/* VirtIO PCI interface. */
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DEVMETHOD(virtio_pci_read_isr, vtpci_legacy_read_isr),
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DEVMETHOD(virtio_pci_get_vq_size, vtpci_legacy_get_vq_size),
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DEVMETHOD(virtio_pci_get_vq_notify_off, vtpci_legacy_get_vq_notify_off),
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DEVMETHOD(virtio_pci_set_vq, vtpci_legacy_set_vq),
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DEVMETHOD(virtio_pci_disable_vq, vtpci_legacy_disable_vq),
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DEVMETHOD(virtio_pci_register_cfg_msix, vtpci_legacy_register_cfg_msix),
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DEVMETHOD(virtio_pci_register_vq_msix, vtpci_legacy_register_vq_msix),
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/* VirtIO bus interface. */
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DEVMETHOD(virtio_bus_negotiate_features, vtpci_legacy_negotiate_features),
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DEVMETHOD(virtio_bus_with_feature, vtpci_legacy_with_feature),
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DEVMETHOD(virtio_bus_alloc_virtqueues, vtpci_legacy_alloc_virtqueues),
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DEVMETHOD(virtio_bus_setup_intr, vtpci_legacy_setup_interrupts),
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DEVMETHOD(virtio_bus_stop, vtpci_legacy_stop),
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DEVMETHOD(virtio_bus_reinit, vtpci_legacy_reinit),
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DEVMETHOD(virtio_bus_reinit_complete, vtpci_legacy_reinit_complete),
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DEVMETHOD(virtio_bus_notify_vq, vtpci_legacy_notify_vq),
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DEVMETHOD(virtio_bus_read_device_config, vtpci_legacy_read_dev_config),
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DEVMETHOD(virtio_bus_write_device_config, vtpci_legacy_write_dev_config),
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DEVMETHOD_END
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};
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static driver_t vtpci_legacy_driver = {
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.name = "virtio_pci",
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.methods = vtpci_legacy_methods,
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.size = sizeof(struct vtpci_legacy_softc)
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};
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devclass_t vtpci_legacy_devclass;
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DRIVER_MODULE(virtio_pci_legacy, pci, vtpci_legacy_driver,
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vtpci_legacy_devclass, 0, 0);
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static int
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vtpci_legacy_probe(device_t dev)
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{
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char desc[64];
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const char *name;
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if (pci_get_vendor(dev) != VIRTIO_PCI_VENDORID)
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return (ENXIO);
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if (pci_get_device(dev) < VIRTIO_PCI_DEVICEID_MIN ||
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pci_get_device(dev) > VIRTIO_PCI_DEVICEID_LEGACY_MAX)
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return (ENXIO);
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if (pci_get_revid(dev) != VIRTIO_PCI_ABI_VERSION)
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return (ENXIO);
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name = virtio_device_name(pci_get_subdevice(dev));
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if (name == NULL)
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name = "Unknown";
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snprintf(desc, sizeof(desc), "VirtIO PCI (legacy) %s adapter", name);
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device_set_desc_copy(dev, desc);
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/* Prefer transitional modern VirtIO PCI. */
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return (BUS_PROBE_LOW_PRIORITY);
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}
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static int
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vtpci_legacy_attach(device_t dev)
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{
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struct vtpci_legacy_softc *sc;
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int error;
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sc = device_get_softc(dev);
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sc->vtpci_dev = dev;
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vtpci_init(&sc->vtpci_common, dev, false);
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error = vtpci_legacy_alloc_resources(sc);
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if (error) {
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device_printf(dev, "cannot map I/O space nor memory space\n");
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return (error);
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}
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if (vtpci_is_msix_available(&sc->vtpci_common) &&
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!vtpci_legacy_setup_msix(sc)) {
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device_printf(dev, "cannot setup MSI-x resources\n");
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error = ENXIO;
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goto fail;
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}
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vtpci_legacy_reset(sc);
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/* Tell the host we've noticed this device. */
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vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK);
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error = vtpci_add_child(&sc->vtpci_common);
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if (error)
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goto fail;
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vtpci_legacy_probe_and_attach_child(sc);
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return (0);
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fail:
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vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_FAILED);
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vtpci_legacy_detach(dev);
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return (error);
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}
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static int
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vtpci_legacy_detach(device_t dev)
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{
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struct vtpci_legacy_softc *sc;
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int error;
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sc = device_get_softc(dev);
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error = vtpci_delete_child(&sc->vtpci_common);
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if (error)
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return (error);
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vtpci_legacy_reset(sc);
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vtpci_legacy_teardown_msix(sc);
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vtpci_legacy_free_resources(sc);
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return (0);
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}
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static int
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vtpci_legacy_suspend(device_t dev)
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{
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return (bus_generic_suspend(dev));
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}
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static int
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vtpci_legacy_resume(device_t dev)
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{
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return (bus_generic_resume(dev));
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}
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static int
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vtpci_legacy_shutdown(device_t dev)
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{
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(void) bus_generic_shutdown(dev);
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/* Forcibly stop the host device. */
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vtpci_legacy_stop(dev);
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return (0);
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}
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static void
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vtpci_legacy_driver_added(device_t dev, driver_t *driver)
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{
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vtpci_legacy_probe_and_attach_child(device_get_softc(dev));
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}
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static void
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vtpci_legacy_child_detached(device_t dev, device_t child)
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{
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struct vtpci_legacy_softc *sc;
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sc = device_get_softc(dev);
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vtpci_legacy_reset(sc);
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vtpci_child_detached(&sc->vtpci_common);
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/* After the reset, retell the host we've noticed this device. */
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vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK);
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}
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static int
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vtpci_legacy_read_ivar(device_t dev, device_t child, int index,
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uintptr_t *result)
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{
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struct vtpci_legacy_softc *sc;
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struct vtpci_common *cn;
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sc = device_get_softc(dev);
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cn = &sc->vtpci_common;
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if (vtpci_child_device(cn) != child)
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return (ENOENT);
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switch (index) {
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case VIRTIO_IVAR_DEVTYPE:
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*result = pci_get_subdevice(dev);
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break;
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default:
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return (vtpci_read_ivar(cn, index, result));
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}
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return (0);
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}
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static int
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vtpci_legacy_write_ivar(device_t dev, device_t child, int index, uintptr_t value)
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{
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struct vtpci_legacy_softc *sc;
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struct vtpci_common *cn;
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sc = device_get_softc(dev);
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cn = &sc->vtpci_common;
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if (vtpci_child_device(cn) != child)
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return (ENOENT);
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switch (index) {
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default:
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return (vtpci_write_ivar(cn, index, value));
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}
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return (0);
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}
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static uint64_t
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vtpci_legacy_negotiate_features(device_t dev, uint64_t child_features)
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{
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struct vtpci_legacy_softc *sc;
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uint64_t host_features, features;
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sc = device_get_softc(dev);
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host_features = vtpci_legacy_read_header_4(sc, VIRTIO_PCI_HOST_FEATURES);
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features = vtpci_negotiate_features(&sc->vtpci_common,
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child_features, host_features);
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vtpci_legacy_write_header_4(sc, VIRTIO_PCI_GUEST_FEATURES, features);
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return (features);
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}
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static int
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vtpci_legacy_with_feature(device_t dev, uint64_t feature)
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{
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struct vtpci_legacy_softc *sc;
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sc = device_get_softc(dev);
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return (vtpci_with_feature(&sc->vtpci_common, feature));
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}
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static int
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vtpci_legacy_alloc_virtqueues(device_t dev, int flags, int nvqs,
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struct vq_alloc_info *vq_info)
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{
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struct vtpci_legacy_softc *sc;
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struct vtpci_common *cn;
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sc = device_get_softc(dev);
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cn = &sc->vtpci_common;
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return (vtpci_alloc_virtqueues(cn, flags, nvqs, vq_info));
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}
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static int
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vtpci_legacy_setup_interrupts(device_t dev, enum intr_type type)
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{
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struct vtpci_legacy_softc *sc;
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sc = device_get_softc(dev);
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return (vtpci_setup_interrupts(&sc->vtpci_common, type));
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}
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static void
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vtpci_legacy_stop(device_t dev)
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{
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vtpci_legacy_reset(device_get_softc(dev));
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}
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static int
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vtpci_legacy_reinit(device_t dev, uint64_t features)
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{
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struct vtpci_legacy_softc *sc;
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struct vtpci_common *cn;
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int error;
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sc = device_get_softc(dev);
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cn = &sc->vtpci_common;
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/*
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* Redrive the device initialization. This is a bit of an abuse of
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* the specification, but VirtualBox, QEMU/KVM, and BHyVe seem to
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* play nice.
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*
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* We do not allow the host device to change from what was originally
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* negotiated beyond what the guest driver changed. MSIX state should
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* not change, number of virtqueues and their size remain the same, etc.
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* This will need to be rethought when we want to support migration.
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*/
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|
|
if (vtpci_legacy_get_status(sc) != VIRTIO_CONFIG_STATUS_RESET)
|
|
vtpci_legacy_stop(dev);
|
|
|
|
/*
|
|
* Quickly drive the status through ACK and DRIVER. The device does
|
|
* not become usable again until DRIVER_OK in reinit complete.
|
|
*/
|
|
vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK);
|
|
vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER);
|
|
|
|
vtpci_legacy_negotiate_features(dev, features);
|
|
|
|
error = vtpci_reinit(cn);
|
|
if (error)
|
|
return (error);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_reinit_complete(device_t dev)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER_OK);
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_notify_vq(device_t dev, uint16_t queue, bus_size_t offset)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
MPASS(offset == VIRTIO_PCI_QUEUE_NOTIFY);
|
|
|
|
vtpci_legacy_write_header_2(sc, offset, queue);
|
|
}
|
|
|
|
static uint8_t
|
|
vtpci_legacy_get_status(struct vtpci_legacy_softc *sc)
|
|
{
|
|
return (vtpci_legacy_read_config_1(sc, VIRTIO_PCI_STATUS));
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_set_status(struct vtpci_legacy_softc *sc, uint8_t status)
|
|
{
|
|
if (status != VIRTIO_CONFIG_STATUS_RESET)
|
|
status |= vtpci_legacy_get_status(sc);
|
|
|
|
vtpci_legacy_write_config_1(sc, VIRTIO_PCI_STATUS, status);
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_read_dev_config(device_t dev, bus_size_t offset,
|
|
void *dst, int length)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
bus_size_t off;
|
|
uint8_t *d;
|
|
int i;
|
|
|
|
sc = device_get_softc(dev);
|
|
off = VIRTIO_PCI_LEGACY_CONFIG(sc) + offset;
|
|
|
|
d = dst;
|
|
for (i = 0; i < length; i++) {
|
|
d[i] = vtpci_legacy_read_config_1(sc, off + i);
|
|
}
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_write_dev_config(device_t dev, bus_size_t offset,
|
|
const void *src, int length)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
bus_size_t off;
|
|
const uint8_t *s;
|
|
int i;
|
|
|
|
sc = device_get_softc(dev);
|
|
off = VIRTIO_PCI_LEGACY_CONFIG(sc) + offset;
|
|
|
|
s = src;
|
|
for (i = 0; i < length; i++) {
|
|
vtpci_legacy_write_config_1(sc, off + i, s[i]);
|
|
}
|
|
}
|
|
|
|
static bool
|
|
vtpci_legacy_setup_msix(struct vtpci_legacy_softc *sc)
|
|
{
|
|
device_t dev;
|
|
int rid, table_rid;
|
|
|
|
dev = sc->vtpci_dev;
|
|
|
|
rid = table_rid = pci_msix_table_bar(dev);
|
|
if (rid != PCIR_BAR(0)) {
|
|
sc->vtpci_msix_table_res = bus_alloc_resource_any(
|
|
dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
|
|
if (sc->vtpci_msix_table_res == NULL)
|
|
return (false);
|
|
}
|
|
|
|
rid = pci_msix_pba_bar(dev);
|
|
if (rid != table_rid && rid != PCIR_BAR(0)) {
|
|
sc->vtpci_msix_pba_res = bus_alloc_resource_any(
|
|
dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
|
|
if (sc->vtpci_msix_pba_res == NULL)
|
|
return (false);
|
|
}
|
|
|
|
return (true);
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc)
|
|
{
|
|
device_t dev;
|
|
|
|
dev = sc->vtpci_dev;
|
|
|
|
if (sc->vtpci_msix_pba_res != NULL) {
|
|
bus_release_resource(dev, SYS_RES_MEMORY,
|
|
rman_get_rid(sc->vtpci_msix_pba_res),
|
|
sc->vtpci_msix_pba_res);
|
|
sc->vtpci_msix_pba_res = NULL;
|
|
}
|
|
if (sc->vtpci_msix_table_res != NULL) {
|
|
bus_release_resource(dev, SYS_RES_MEMORY,
|
|
rman_get_rid(sc->vtpci_msix_table_res),
|
|
sc->vtpci_msix_table_res);
|
|
sc->vtpci_msix_table_res = NULL;
|
|
}
|
|
}
|
|
|
|
static int
|
|
vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *sc)
|
|
{
|
|
const int res_types[] = { SYS_RES_IOPORT, SYS_RES_MEMORY };
|
|
device_t dev;
|
|
int rid, i;
|
|
|
|
dev = sc->vtpci_dev;
|
|
|
|
/*
|
|
* Most hypervisors export the common configuration structure in IO
|
|
* space, but some use memory space; try both.
|
|
*/
|
|
for (i = 0; nitems(res_types); i++) {
|
|
rid = PCIR_BAR(0);
|
|
sc->vtpci_res_type = res_types[i];
|
|
sc->vtpci_res = bus_alloc_resource_any(dev, res_types[i], &rid,
|
|
RF_ACTIVE);
|
|
if (sc->vtpci_res != NULL)
|
|
break;
|
|
}
|
|
if (sc->vtpci_res == NULL)
|
|
return (ENXIO);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_free_resources(struct vtpci_legacy_softc *sc)
|
|
{
|
|
device_t dev;
|
|
|
|
dev = sc->vtpci_dev;
|
|
|
|
if (sc->vtpci_res != NULL) {
|
|
bus_release_resource(dev, sc->vtpci_res_type, PCIR_BAR(0),
|
|
sc->vtpci_res);
|
|
sc->vtpci_res = NULL;
|
|
}
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_probe_and_attach_child(struct vtpci_legacy_softc *sc)
|
|
{
|
|
device_t dev, child;
|
|
|
|
dev = sc->vtpci_dev;
|
|
child = vtpci_child_device(&sc->vtpci_common);
|
|
|
|
if (child == NULL || device_get_state(child) != DS_NOTPRESENT)
|
|
return;
|
|
|
|
if (device_probe(child) != 0)
|
|
return;
|
|
|
|
vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER);
|
|
|
|
if (device_attach(child) != 0) {
|
|
vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_FAILED);
|
|
/* Reset status for future attempt. */
|
|
vtpci_legacy_child_detached(dev, child);
|
|
} else {
|
|
vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_DRIVER_OK);
|
|
VIRTIO_ATTACH_COMPLETED(child);
|
|
}
|
|
}
|
|
|
|
static int
|
|
vtpci_legacy_register_msix(struct vtpci_legacy_softc *sc, int offset,
|
|
struct vtpci_interrupt *intr)
|
|
{
|
|
device_t dev;
|
|
uint16_t vector;
|
|
|
|
dev = sc->vtpci_dev;
|
|
|
|
if (intr != NULL) {
|
|
/* Map from guest rid to host vector. */
|
|
vector = intr->vti_rid - 1;
|
|
} else
|
|
vector = VIRTIO_MSI_NO_VECTOR;
|
|
|
|
vtpci_legacy_write_header_2(sc, offset, vector);
|
|
return (vtpci_legacy_read_header_2(sc, offset) == vector ? 0 : ENODEV);
|
|
}
|
|
|
|
static int
|
|
vtpci_legacy_register_cfg_msix(device_t dev, struct vtpci_interrupt *intr)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
int error;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
error = vtpci_legacy_register_msix(sc, VIRTIO_MSI_CONFIG_VECTOR, intr);
|
|
if (error) {
|
|
device_printf(dev,
|
|
"unable to register config MSIX interrupt\n");
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
vtpci_legacy_register_vq_msix(device_t dev, int idx,
|
|
struct vtpci_interrupt *intr)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
int error;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
vtpci_legacy_select_virtqueue(sc, idx);
|
|
error = vtpci_legacy_register_msix(sc, VIRTIO_MSI_QUEUE_VECTOR, intr);
|
|
if (error) {
|
|
device_printf(dev,
|
|
"unable to register virtqueue MSIX interrupt\n");
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_reset(struct vtpci_legacy_softc *sc)
|
|
{
|
|
/*
|
|
* Setting the status to RESET sets the host device to the
|
|
* original, uninitialized state.
|
|
*/
|
|
vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_RESET);
|
|
(void) vtpci_legacy_get_status(sc);
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_select_virtqueue(struct vtpci_legacy_softc *sc, int idx)
|
|
{
|
|
vtpci_legacy_write_header_2(sc, VIRTIO_PCI_QUEUE_SEL, idx);
|
|
}
|
|
|
|
static uint8_t
|
|
vtpci_legacy_read_isr(device_t dev)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
return (vtpci_legacy_read_config_1(sc, VIRTIO_PCI_ISR));
|
|
}
|
|
|
|
static uint16_t
|
|
vtpci_legacy_get_vq_size(device_t dev, int idx)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
vtpci_legacy_select_virtqueue(sc, idx);
|
|
return (vtpci_legacy_read_header_2(sc, VIRTIO_PCI_QUEUE_NUM));
|
|
}
|
|
|
|
static bus_size_t
|
|
vtpci_legacy_get_vq_notify_off(device_t dev, int idx)
|
|
{
|
|
return (VIRTIO_PCI_QUEUE_NOTIFY);
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_set_vq(device_t dev, struct virtqueue *vq)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
vtpci_legacy_select_virtqueue(sc, virtqueue_index(vq));
|
|
vtpci_legacy_write_header_4(sc, VIRTIO_PCI_QUEUE_PFN,
|
|
virtqueue_paddr(vq) >> VIRTIO_PCI_QUEUE_ADDR_SHIFT);
|
|
}
|
|
|
|
static void
|
|
vtpci_legacy_disable_vq(device_t dev, int idx)
|
|
{
|
|
struct vtpci_legacy_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
vtpci_legacy_select_virtqueue(sc, idx);
|
|
vtpci_legacy_write_header_4(sc, VIRTIO_PCI_QUEUE_PFN, 0);
|
|
}
|