diff --git a/sys/dev/virtio/pci/virtio_pci_legacy.c b/sys/dev/virtio/pci/virtio_pci_legacy.c index 22e369097e2e..d74983099110 100644 --- a/sys/dev/virtio/pci/virtio_pci_legacy.c +++ b/sys/dev/virtio/pci/virtio_pci_legacy.c @@ -1,733 +1,779 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2011, Bryan Venteicher * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice unmodified, this list of conditions, and the following * disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* Driver for the legacy VirtIO PCI interface. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "virtio_bus_if.h" #include "virtio_pci_if.h" #include "virtio_if.h" struct vtpci_legacy_softc { device_t vtpci_dev; struct vtpci_common vtpci_common; struct resource *vtpci_res; - struct resource *vtpci_msix_res; + struct resource *vtpci_msix_table_res; + struct resource *vtpci_msix_pba_res; }; static int vtpci_legacy_probe(device_t); static int vtpci_legacy_attach(device_t); static int vtpci_legacy_detach(device_t); static int vtpci_legacy_suspend(device_t); static int vtpci_legacy_resume(device_t); static int vtpci_legacy_shutdown(device_t); static void vtpci_legacy_driver_added(device_t, driver_t *); static void vtpci_legacy_child_detached(device_t, device_t); static int vtpci_legacy_read_ivar(device_t, device_t, int, uintptr_t *); static int vtpci_legacy_write_ivar(device_t, device_t, int, uintptr_t); static uint8_t vtpci_legacy_read_isr(device_t); static uint16_t vtpci_legacy_get_vq_size(device_t, int); static bus_size_t vtpci_legacy_get_vq_notify_off(device_t, int); static void vtpci_legacy_set_vq(device_t, struct virtqueue *); static void vtpci_legacy_disable_vq(device_t, int); static int vtpci_legacy_register_cfg_msix(device_t, struct vtpci_interrupt *); static int vtpci_legacy_register_vq_msix(device_t, int idx, struct vtpci_interrupt *); static uint64_t vtpci_legacy_negotiate_features(device_t, uint64_t); static int vtpci_legacy_with_feature(device_t, uint64_t); static int vtpci_legacy_alloc_virtqueues(device_t, int, int, struct vq_alloc_info *); static int vtpci_legacy_setup_interrupts(device_t, enum intr_type); static void vtpci_legacy_stop(device_t); static int vtpci_legacy_reinit(device_t, uint64_t); static void vtpci_legacy_reinit_complete(device_t); static void vtpci_legacy_notify_vq(device_t, uint16_t, bus_size_t); static void vtpci_legacy_read_dev_config(device_t, bus_size_t, void *, int); static void vtpci_legacy_write_dev_config(device_t, bus_size_t, void *, int); +static bool vtpci_legacy_setup_msix(struct vtpci_legacy_softc *sc); +static void vtpci_legacy_teardown_msix(struct vtpci_legacy_softc *sc); static int vtpci_legacy_alloc_resources(struct vtpci_legacy_softc *); static void vtpci_legacy_free_resources(struct vtpci_legacy_softc *); static void vtpci_legacy_probe_and_attach_child(struct vtpci_legacy_softc *); static uint8_t vtpci_legacy_get_status(struct vtpci_legacy_softc *); static void vtpci_legacy_set_status(struct vtpci_legacy_softc *, uint8_t); static void vtpci_legacy_select_virtqueue(struct vtpci_legacy_softc *, int); static void vtpci_legacy_reset(struct vtpci_legacy_softc *); #define VIRTIO_PCI_LEGACY_CONFIG(_sc) \ VIRTIO_PCI_CONFIG_OFF(vtpci_is_msix_enabled(&(_sc)->vtpci_common)) #define vtpci_legacy_read_config_1(sc, o) \ bus_read_1((sc)->vtpci_res, (o)) #define vtpci_legacy_write_config_1(sc, o, v) \ bus_write_1((sc)->vtpci_res, (o), (v)) /* * VirtIO specifies that PCI Configuration area is guest endian. However, * since PCI devices are inherently little-endian, on big-endian systems * the bus layer transparently converts it to BE. For virtio-legacy, this * conversion is undesired, so an extra byte swap is required to fix it. */ #define vtpci_legacy_read_config_2(sc, o) \ le16toh(bus_read_2((sc)->vtpci_res, (o))) #define vtpci_legacy_read_config_4(sc, o) \ le32toh(bus_read_4((sc)->vtpci_res, (o))) #define vtpci_legacy_write_config_2(sc, o, v) \ bus_write_2((sc)->vtpci_res, (o), (htole16(v))) #define vtpci_legacy_write_config_4(sc, o, v) \ bus_write_4((sc)->vtpci_res, (o), (htole32(v))) /* PCI Header LE. On BE systems the bus layer takes care of byte swapping. */ #define vtpci_legacy_read_header_2(sc, o) \ bus_read_2((sc)->vtpci_res, (o)) #define vtpci_legacy_read_header_4(sc, o) \ bus_read_4((sc)->vtpci_res, (o)) #define vtpci_legacy_write_header_2(sc, o, v) \ bus_write_2((sc)->vtpci_res, (o), (v)) #define vtpci_legacy_write_header_4(sc, o, v) \ bus_write_4((sc)->vtpci_res, (o), (v)) static device_method_t vtpci_legacy_methods[] = { /* Device interface. */ DEVMETHOD(device_probe, vtpci_legacy_probe), DEVMETHOD(device_attach, vtpci_legacy_attach), DEVMETHOD(device_detach, vtpci_legacy_detach), DEVMETHOD(device_suspend, vtpci_legacy_suspend), DEVMETHOD(device_resume, vtpci_legacy_resume), DEVMETHOD(device_shutdown, vtpci_legacy_shutdown), /* Bus interface. */ DEVMETHOD(bus_driver_added, vtpci_legacy_driver_added), DEVMETHOD(bus_child_detached, vtpci_legacy_child_detached), DEVMETHOD(bus_child_pnpinfo_str, virtio_child_pnpinfo_str), DEVMETHOD(bus_read_ivar, vtpci_legacy_read_ivar), DEVMETHOD(bus_write_ivar, vtpci_legacy_write_ivar), /* VirtIO PCI interface. */ DEVMETHOD(virtio_pci_read_isr, vtpci_legacy_read_isr), DEVMETHOD(virtio_pci_get_vq_size, vtpci_legacy_get_vq_size), DEVMETHOD(virtio_pci_get_vq_notify_off, vtpci_legacy_get_vq_notify_off), DEVMETHOD(virtio_pci_set_vq, vtpci_legacy_set_vq), DEVMETHOD(virtio_pci_disable_vq, vtpci_legacy_disable_vq), DEVMETHOD(virtio_pci_register_cfg_msix, vtpci_legacy_register_cfg_msix), DEVMETHOD(virtio_pci_register_vq_msix, vtpci_legacy_register_vq_msix), /* VirtIO bus interface. */ DEVMETHOD(virtio_bus_negotiate_features, vtpci_legacy_negotiate_features), DEVMETHOD(virtio_bus_with_feature, vtpci_legacy_with_feature), DEVMETHOD(virtio_bus_alloc_virtqueues, vtpci_legacy_alloc_virtqueues), DEVMETHOD(virtio_bus_setup_intr, vtpci_legacy_setup_interrupts), DEVMETHOD(virtio_bus_stop, vtpci_legacy_stop), DEVMETHOD(virtio_bus_reinit, vtpci_legacy_reinit), DEVMETHOD(virtio_bus_reinit_complete, vtpci_legacy_reinit_complete), DEVMETHOD(virtio_bus_notify_vq, vtpci_legacy_notify_vq), DEVMETHOD(virtio_bus_read_device_config, vtpci_legacy_read_dev_config), DEVMETHOD(virtio_bus_write_device_config, vtpci_legacy_write_dev_config), DEVMETHOD_END }; static driver_t vtpci_legacy_driver = { .name = "virtio_pci", .methods = vtpci_legacy_methods, .size = sizeof(struct vtpci_legacy_softc) }; devclass_t vtpci_legacy_devclass; DRIVER_MODULE(virtio_pci_legacy, pci, vtpci_legacy_driver, vtpci_legacy_devclass, 0, 0); static int vtpci_legacy_probe(device_t dev) { char desc[64]; const char *name; if (pci_get_vendor(dev) != VIRTIO_PCI_VENDORID) return (ENXIO); if (pci_get_device(dev) < VIRTIO_PCI_DEVICEID_MIN || pci_get_device(dev) > VIRTIO_PCI_DEVICEID_LEGACY_MAX) return (ENXIO); if (pci_get_revid(dev) != VIRTIO_PCI_ABI_VERSION) return (ENXIO); name = virtio_device_name(pci_get_subdevice(dev)); if (name == NULL) name = "Unknown"; snprintf(desc, sizeof(desc), "VirtIO PCI (legacy) %s adapter", name); device_set_desc_copy(dev, desc); /* Prefer transitional modern VirtIO PCI. */ return (BUS_PROBE_LOW_PRIORITY); } static int vtpci_legacy_attach(device_t dev) { struct vtpci_legacy_softc *sc; int error; sc = device_get_softc(dev); sc->vtpci_dev = dev; vtpci_init(&sc->vtpci_common, dev, false); error = vtpci_legacy_alloc_resources(sc); if (error) { device_printf(dev, "cannot map I/O space\n"); return (error); } + if (vtpci_is_msix_available(&sc->vtpci_common) && + !vtpci_legacy_setup_msix(sc)) { + device_printf(dev, "cannot setup MSI-x resources\n"); + error = ENXIO; + goto fail; + } + vtpci_legacy_reset(sc); /* Tell the host we've noticed this device. */ vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK); error = vtpci_add_child(&sc->vtpci_common); if (error) goto fail; vtpci_legacy_probe_and_attach_child(sc); return (0); fail: vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_FAILED); vtpci_legacy_detach(dev); return (error); } static int vtpci_legacy_detach(device_t dev) { struct vtpci_legacy_softc *sc; int error; sc = device_get_softc(dev); error = vtpci_delete_child(&sc->vtpci_common); if (error) return (error); vtpci_legacy_reset(sc); + vtpci_legacy_teardown_msix(sc); vtpci_legacy_free_resources(sc); return (0); } static int vtpci_legacy_suspend(device_t dev) { return (bus_generic_suspend(dev)); } static int vtpci_legacy_resume(device_t dev) { return (bus_generic_resume(dev)); } static int vtpci_legacy_shutdown(device_t dev) { (void) bus_generic_shutdown(dev); /* Forcibly stop the host device. */ vtpci_legacy_stop(dev); return (0); } static void vtpci_legacy_driver_added(device_t dev, driver_t *driver) { vtpci_legacy_probe_and_attach_child(device_get_softc(dev)); } static void vtpci_legacy_child_detached(device_t dev, device_t child) { struct vtpci_legacy_softc *sc; sc = device_get_softc(dev); vtpci_legacy_reset(sc); vtpci_child_detached(&sc->vtpci_common); /* After the reset, retell the host we've noticed this device. */ vtpci_legacy_set_status(sc, VIRTIO_CONFIG_STATUS_ACK); } static int vtpci_legacy_read_ivar(device_t dev, device_t child, int index, uintptr_t *result) { struct vtpci_legacy_softc *sc; struct vtpci_common *cn; sc = device_get_softc(dev); cn = &sc->vtpci_common; if (vtpci_child_device(cn) != child) return (ENOENT); switch (index) { case VIRTIO_IVAR_DEVTYPE: *result = pci_get_subdevice(dev); break; default: return (vtpci_read_ivar(cn, index, result)); } return (0); } static int vtpci_legacy_write_ivar(device_t dev, device_t child, int index, uintptr_t value) { struct vtpci_legacy_softc *sc; struct vtpci_common *cn; sc = device_get_softc(dev); cn = &sc->vtpci_common; if (vtpci_child_device(cn) != child) return (ENOENT); switch (index) { default: return (vtpci_write_ivar(cn, index, value)); } return (0); } static uint64_t vtpci_legacy_negotiate_features(device_t dev, uint64_t child_features) { struct vtpci_legacy_softc *sc; uint64_t host_features, features; sc = device_get_softc(dev); host_features = vtpci_legacy_read_header_4(sc, VIRTIO_PCI_HOST_FEATURES); features = vtpci_negotiate_features(&sc->vtpci_common, child_features, host_features); vtpci_legacy_write_header_4(sc, VIRTIO_PCI_GUEST_FEATURES, features); return (features); } static int vtpci_legacy_with_feature(device_t dev, uint64_t feature) { struct vtpci_legacy_softc *sc; sc = device_get_softc(dev); return (vtpci_with_feature(&sc->vtpci_common, feature)); } static int vtpci_legacy_alloc_virtqueues(device_t dev, int flags, int nvqs, struct vq_alloc_info *vq_info) { struct vtpci_legacy_softc *sc; struct vtpci_common *cn; sc = device_get_softc(dev); cn = &sc->vtpci_common; return (vtpci_alloc_virtqueues(cn, flags, nvqs, vq_info)); } static int vtpci_legacy_setup_interrupts(device_t dev, enum intr_type type) { struct vtpci_legacy_softc *sc; sc = device_get_softc(dev); return (vtpci_setup_interrupts(&sc->vtpci_common, type)); } static void vtpci_legacy_stop(device_t dev) { vtpci_legacy_reset(device_get_softc(dev)); } static int vtpci_legacy_reinit(device_t dev, uint64_t features) { struct vtpci_legacy_softc *sc; struct vtpci_common *cn; int error; sc = device_get_softc(dev); cn = &sc->vtpci_common; /* * Redrive the device initialization. This is a bit of an abuse of * the specification, but VirtualBox, QEMU/KVM, and BHyVe seem to * play nice. * * We do not allow the host device to change from what was originally * negotiated beyond what the guest driver changed. MSIX state should * not change, number of virtqueues and their size remain the same, etc. * This will need to be rethought when we want to support migration. */ 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 size; sc = device_get_softc(dev); off = VIRTIO_PCI_LEGACY_CONFIG(sc) + offset; for (d = dst; length > 0; d += size, off += size, length -= size) { if (length >= 4) { size = 4; *(uint32_t *)d = vtpci_legacy_read_config_4(sc, off); } else if (length >= 2) { size = 2; *(uint16_t *)d = vtpci_legacy_read_config_2(sc, off); } else { size = 1; *d = vtpci_legacy_read_config_1(sc, off); } } } static void vtpci_legacy_write_dev_config(device_t dev, bus_size_t offset, void *src, int length) { struct vtpci_legacy_softc *sc; bus_size_t off; uint8_t *s; int size; sc = device_get_softc(dev); off = VIRTIO_PCI_LEGACY_CONFIG(sc) + offset; for (s = src; length > 0; s += size, off += size, length -= size) { if (length >= 4) { size = 4; vtpci_legacy_write_config_4(sc, off, *(uint32_t *)s); } else if (length >= 2) { size = 2; vtpci_legacy_write_config_2(sc, off, *(uint16_t *)s); } else { size = 1; vtpci_legacy_write_config_1(sc, off, *s); } } } +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) { device_t dev; int rid; dev = sc->vtpci_dev; rid = PCIR_BAR(0); if ((sc->vtpci_res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, RF_ACTIVE)) == NULL) return (ENXIO); - if (vtpci_is_msix_available(&sc->vtpci_common)) { - rid = PCIR_BAR(1); - if ((sc->vtpci_msix_res = bus_alloc_resource_any(dev, - SYS_RES_MEMORY, &rid, RF_ACTIVE)) == 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_msix_res != NULL) { - bus_release_resource(dev, SYS_RES_MEMORY, PCIR_BAR(1), - sc->vtpci_msix_res); - sc->vtpci_msix_res = NULL; - } - if (sc->vtpci_res != NULL) { bus_release_resource(dev, SYS_RES_IOPORT, 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); }