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e0d686bf4b
Currently we will try to traverse all virtqueues to find a subset that using a specific vector. This is sub optimal when we will support hundreds or even thousands of virtqueues. So this patch introduces a method which could be used by transport to get all virtqueues that using a same vector. This is done through QLISTs and the number of QLISTs was queried through a transport specific method. When guest setting vectors, the virtqueue will be linked and helpers for traverse the list was also introduced. The first user will be virtio pci which will use this to speed up MSI-X masking and unmasking handling. Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
108 lines
3.9 KiB
C
108 lines
3.9 KiB
C
/*
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* VirtioBus
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*
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* Copyright (C) 2012 : GreenSocs Ltd
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* http://www.greensocs.com/ , email: info@greensocs.com
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*
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* Developed by :
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* Frederic Konrad <fred.konrad@greensocs.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef VIRTIO_BUS_H
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#define VIRTIO_BUS_H
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#include "hw/qdev.h"
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#include "sysemu/sysemu.h"
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#include "hw/virtio/virtio.h"
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#define TYPE_VIRTIO_BUS "virtio-bus"
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#define VIRTIO_BUS_GET_CLASS(obj) \
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OBJECT_GET_CLASS(VirtioBusClass, obj, TYPE_VIRTIO_BUS)
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#define VIRTIO_BUS_CLASS(klass) \
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OBJECT_CLASS_CHECK(VirtioBusClass, klass, TYPE_VIRTIO_BUS)
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#define VIRTIO_BUS(obj) OBJECT_CHECK(VirtioBusState, (obj), TYPE_VIRTIO_BUS)
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typedef struct VirtioBusState VirtioBusState;
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typedef struct VirtioBusClass {
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/* This is what a VirtioBus must implement */
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BusClass parent;
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void (*notify)(DeviceState *d, uint16_t vector);
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void (*save_config)(DeviceState *d, QEMUFile *f);
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void (*save_queue)(DeviceState *d, int n, QEMUFile *f);
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int (*load_config)(DeviceState *d, QEMUFile *f);
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int (*load_queue)(DeviceState *d, int n, QEMUFile *f);
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int (*load_done)(DeviceState *d, QEMUFile *f);
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unsigned (*get_features)(DeviceState *d);
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bool (*query_guest_notifiers)(DeviceState *d);
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int (*set_guest_notifiers)(DeviceState *d, int nvqs, bool assign);
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int (*set_host_notifier)(DeviceState *d, int n, bool assigned);
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void (*vmstate_change)(DeviceState *d, bool running);
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/*
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* transport independent init function.
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* This is called by virtio-bus just after the device is plugged.
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*/
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void (*device_plugged)(DeviceState *d);
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/*
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* transport independent exit function.
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* This is called by virtio-bus just before the device is unplugged.
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*/
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void (*device_unplugged)(DeviceState *d);
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int (*query_nvectors)(DeviceState *d);
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/*
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* Does the transport have variable vring alignment?
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* (ie can it ever call virtio_queue_set_align()?)
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* Note that changing this will break migration for this transport.
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*/
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bool has_variable_vring_alignment;
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} VirtioBusClass;
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struct VirtioBusState {
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BusState parent_obj;
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};
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int virtio_bus_device_plugged(VirtIODevice *vdev);
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void virtio_bus_reset(VirtioBusState *bus);
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void virtio_bus_device_unplugged(VirtIODevice *bus);
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/* Get the device id of the plugged device. */
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uint16_t virtio_bus_get_vdev_id(VirtioBusState *bus);
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/* Get the config_len field of the plugged device. */
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size_t virtio_bus_get_vdev_config_len(VirtioBusState *bus);
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/* Get the features of the plugged device. */
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uint32_t virtio_bus_get_vdev_features(VirtioBusState *bus,
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uint32_t requested_features);
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/* Get bad features of the plugged device. */
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uint32_t virtio_bus_get_vdev_bad_features(VirtioBusState *bus);
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/* Get config of the plugged device. */
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void virtio_bus_get_vdev_config(VirtioBusState *bus, uint8_t *config);
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/* Set config of the plugged device. */
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void virtio_bus_set_vdev_config(VirtioBusState *bus, uint8_t *config);
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static inline VirtIODevice *virtio_bus_get_device(VirtioBusState *bus)
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{
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BusState *qbus = &bus->parent_obj;
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BusChild *kid = QTAILQ_FIRST(&qbus->children);
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DeviceState *qdev = kid ? kid->child : NULL;
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/* This is used on the data path, the cast is guaranteed
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* to succeed by the qdev machinery.
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*/
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return (VirtIODevice *)qdev;
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}
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#endif /* VIRTIO_BUS_H */
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