Re: [Qemu-devel] [PATCH V2 5/7] virtio-pci: refactor virtio-pci device.

[Anthony Liguori <aliguori@us.ibm.com>]

fred.konrad@greensocs.com writes:

> From: KONRAD Frederic <fred.konrad@greensocs.com>
>
> Create the virtio-pci device. This transport device will create a
> virtio-pci-bus, so one VirtIODevice can be connected.
>
> Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com>

virtio-pci should be abstract...

> ---
>  hw/virtio-pci.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/virtio-pci.h |  18 ++++++++
>  2 files changed, 145 insertions(+)
>
> diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
> index 090dc41..8598aee 100644
> --- a/hw/virtio-pci.c
> +++ b/hw/virtio-pci.c
> @@ -1163,6 +1163,130 @@ static TypeInfo virtio_scsi_info = {
>      .class_init    = virtio_scsi_class_init,
>  };
>  
> +/*
> + * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
> + */
> +
> +/* This is called by virtio-bus just after the device is plugged. */
> +static void virtio_pci_device_plugged(DeviceState *d)
> +{
> +    VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
> +    VirtioBusState *bus = proxy->bus;
> +    uint8_t *config;
> +    uint32_t size;
> +    uint16_t device_id = 0;
> +    uint16_t class_id = 0;
> +
> +    switch (virtio_device_get_id(proxy->bus)) {
> +    default:
> +        error_report("unknown device id\n");
> +        break;
> +    }

And this chunk should die.  Let's avoid having two ways of specifying
virtio-pci devices.

Regards,

Anthony Liguori

> +    pci_config_set_device_id(proxy->pci_dev.config, device_id);
> +    pci_config_set_class(proxy->pci_dev.config, class_id);
> +
> +    proxy->vdev = proxy->bus->vdev;
> +
> +    config = proxy->pci_dev.config;
> +    if (proxy->class_code) {
> +        pci_config_set_class(config, proxy->class_code);
> +    }
> +    pci_set_word(config + PCI_SUBSYSTEM_VENDOR_ID,
> +                 pci_get_word(config + PCI_VENDOR_ID));
> +    pci_set_word(config + PCI_SUBSYSTEM_ID, virtio_device_get_id(proxy->bus));
> +    config[PCI_INTERRUPT_PIN] = 1;
> +
> +    if (proxy->nvectors &&
> +        msix_init_exclusive_bar(&proxy->pci_dev, proxy->nvectors, 1)) {
> +        proxy->nvectors = 0;
> +    }
> +
> +    proxy->pci_dev.config_write = virtio_write_config;
> +
> +    size = VIRTIO_PCI_REGION_SIZE(&proxy->pci_dev)
> +         + virtio_device_get_config_len(bus);
> +    if (size & (size - 1)) {
> +        size = 1 << qemu_fls(size);
> +    }
> +
> +    memory_region_init_io(&proxy->bar, &virtio_pci_config_ops, proxy,
> +                          "virtio-pci", size);
> +    pci_register_bar(&proxy->pci_dev, 0, PCI_BASE_ADDRESS_SPACE_IO,
> +                     &proxy->bar);
> +
> +    if (!kvm_has_many_ioeventfds()) {
> +        proxy->flags &= ~VIRTIO_PCI_FLAG_USE_IOEVENTFD;
> +    }
> +
> +    proxy->host_features |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
> +    proxy->host_features |= 0x1 << VIRTIO_F_BAD_FEATURE;
> +    proxy->host_features = virtio_device_get_features(bus,
> +                                                      proxy->host_features);
> +}
> +
> +/* This is called by virtio-bus just before the device is unplugged. */
> +static void virtio_pci_device_unplug(DeviceState *d)
> +{
> +    VirtIOPCIProxy *dev = VIRTIO_PCI(d);
> +    virtio_pci_stop_ioeventfd(dev);
> +}
> +
> +static int virtio_pci_init(PCIDevice *pci_dev)
> +{
> +    VirtIOPCIProxy *dev = VIRTIO_PCI(pci_dev);
> +    VirtioPCIClass *k = VIRTIO_PCI_GET_CLASS(pci_dev);
> +    dev->bus = virtio_pci_bus_new(dev);
> +    if (k->init != NULL) {
> +        return k->init(dev);
> +    }
> +    return 0;
> +}
> +
> +static void virtio_pci_exit(PCIDevice *pci_dev)
> +{
> +    VirtIOPCIProxy *proxy = VIRTIO_PCI(pci_dev);
> +    VirtioBusState *bus = VIRTIO_BUS(proxy->bus);
> +    BusState *qbus = BUS(proxy->bus);
> +    virtio_bus_destroy_device(bus);
> +    qbus_free(qbus);
> +    virtio_exit_pci(pci_dev);
> +}
> +
> +/*
> + * This will be renamed virtio_pci_reset at the end of the series.
> + * virtio_pci_reset is still in use at this moment.
> + */
> +static void virtio_pci_rst(DeviceState *qdev)
> +{
> +    VirtIOPCIProxy *proxy = VIRTIO_PCI(qdev);
> +    VirtioBusState *bus = VIRTIO_BUS(proxy->bus);
> +    virtio_pci_stop_ioeventfd(proxy);
> +    virtio_bus_reset(bus);
> +    msix_unuse_all_vectors(&proxy->pci_dev);
> +    proxy->flags &= ~VIRTIO_PCI_FLAG_BUS_MASTER_BUG;
> +}
> +
> +static void virtio_pci_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
> +
> +    k->init = virtio_pci_init;
> +    k->exit = virtio_pci_exit;
> +    k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
> +    k->revision = VIRTIO_PCI_ABI_VERSION;
> +    k->class_id = PCI_CLASS_OTHERS;
> +    dc->reset = virtio_pci_rst;
> +}
> +
> +static const TypeInfo virtio_pci_info = {
> +    .name          = TYPE_VIRTIO_PCI,
> +    .parent        = TYPE_PCI_DEVICE,
> +    .instance_size = sizeof(VirtIOPCIProxy),
> +    .class_init    = virtio_pci_class_init,
> +    .class_size    = sizeof(VirtioPCIClass),
> +};
> +
>  /* virtio-pci-bus */
>  
>  VirtioBusState *virtio_pci_bus_new(VirtIOPCIProxy *dev)
> @@ -1189,6 +1313,8 @@ static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
>      k->set_host_notifier = virtio_pci_set_host_notifier;
>      k->set_guest_notifiers = virtio_pci_set_guest_notifiers;
>      k->vmstate_change = virtio_pci_vmstate_change;
> +    k->device_plugged = virtio_pci_device_plugged;
> +    k->device_unplug = virtio_pci_device_unplug;
>  }
>  
>  static const TypeInfo virtio_pci_bus_info = {
> @@ -1207,6 +1333,7 @@ static void virtio_pci_register_types(void)
>      type_register_static(&virtio_scsi_info);
>      type_register_static(&virtio_rng_info);
>      type_register_static(&virtio_pci_bus_info);
> +    type_register_static(&virtio_pci_info);
>  }
>  
>  type_init(virtio_pci_register_types)
> diff --git a/hw/virtio-pci.h b/hw/virtio-pci.h
> index ed0097f..f05f63c 100644
> --- a/hw/virtio-pci.h
> +++ b/hw/virtio-pci.h
> @@ -50,6 +50,22 @@ typedef struct {
>      unsigned int users;
>  } VirtIOIRQFD;
>  
> +/*
> + * virtio-pci: This is the PCIDevice which has a virtio-pci-bus.
> + */
> +#define TYPE_VIRTIO_PCI "virtio-pci"
> +#define VIRTIO_PCI_GET_CLASS(obj) \
> +        OBJECT_GET_CLASS(VirtioPCIClass, obj, TYPE_VIRTIO_PCI)
> +#define VIRTIO_PCI_CLASS(klass) \
> +        OBJECT_CLASS_CHECK(VirtioPCIClass, klass, TYPE_VIRTIO_PCI)
> +#define VIRTIO_PCI(obj) \
> +        OBJECT_CHECK(VirtIOPCIProxy, (obj), TYPE_VIRTIO_PCI)
> +
> +typedef struct VirtioPCIClass {
> +    PCIDeviceClass parent_class;
> +    int (*init)(VirtIOPCIProxy *vpci_dev);
> +} VirtioPCIClass;
> +
>  struct VirtIOPCIProxy {
>      PCIDevice pci_dev;
>      VirtIODevice *vdev;
> @@ -70,6 +86,8 @@ struct VirtIOPCIProxy {
>      bool ioeventfd_disabled;
>      bool ioeventfd_started;
>      VirtIOIRQFD *vector_irqfd;
> +    /* That's the virtio-bus on which VirtioDevice will be connected. */
> +    VirtioBusState *bus;
>  };
>  
>  void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev);
> -- 
> 1.7.11.7