Re: [Qemu-devel] [RfC PATCH 07/15] virtio-gpu-pci: add virtio pci support

[Max Reitz <mreitz@redhat.com>]

On 2015-02-23 at 05:23, Gerd Hoffmann wrote:
> This patch adds virtio-gpu-pci, which is the pci proxy for the virtio
> gpu device.  With this patch in place virtio-gpu is functional.  You
> need a linux guest with a virtio-gpu driver though, and output will
> appear pretty late in boot, once the kernel initialized drm and fbcon.
>
> Written by Dave Airlie and Gerd Hoffmann.
>
> Signed-off-by: Dave Airlie <airlied@redhat.com>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>   hw/display/Makefile.objs    |  1 +
>   hw/display/virtio-gpu-pci.c | 71 +++++++++++++++++++++++++++++++++++++++++++++
>   hw/virtio/virtio-pci.h      | 15 ++++++++++
>   include/hw/pci/pci.h        |  1 +
>   4 files changed, 88 insertions(+)
>   create mode 100644 hw/display/virtio-gpu-pci.c
>
> diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
> index 6990634..ab6b791 100644
> --- a/hw/display/Makefile.objs
> +++ b/hw/display/Makefile.objs
> @@ -35,3 +35,4 @@ obj-$(CONFIG_VGA) += vga.o
>   common-obj-$(CONFIG_QXL) += qxl.o qxl-logger.o qxl-render.o
>   
>   obj-$(CONFIG_VIRTIO) += virtio-gpu.o
> +obj-$(CONFIG_VIRTIO_PCI) += virtio-gpu-pci.o
> diff --git a/hw/display/virtio-gpu-pci.c b/hw/display/virtio-gpu-pci.c
> new file mode 100644
> index 0000000..77c5e06
> --- /dev/null
> +++ b/hw/display/virtio-gpu-pci.c
> @@ -0,0 +1,71 @@
> +/*
> + * Virtio video device
> + *
> + * Copyright Red Hat
> + *
> + * Authors:
> + *  Dave Airlie
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2.  See
> + * the COPYING file in the top-level directory.
> + *
> + */
> +#include "hw/pci/pci.h"
> +#include "hw/virtio/virtio.h"
> +#include "hw/virtio/virtio-bus.h"
> +#include "hw/virtio/virtio-pci.h"
> +#include "hw/virtio/virtio-gpu.h"
> +
> +static Property virtio_gpu_pci_properties[] = {
> +    DEFINE_VIRTIO_GPU_PROPERTIES(VirtIOGPUPCI, vdev.conf),
> +    DEFINE_VIRTIO_GPU_PCI_PROPERTIES(VirtIOPCIProxy),
> +    DEFINE_PROP_END_OF_LIST(),
> +};
> +
> +static int virtio_gpu_pci_init(VirtIOPCIProxy *vpci_dev)
> +{
> +    VirtIOGPUPCI *vgpu = VIRTIO_GPU_PCI(vpci_dev);
> +    DeviceState *vdev = DEVICE(&vgpu->vdev);
> +
> +    qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
> +    if (qdev_init(vdev) < 0) {
> +        return -1;
> +    }
> +    return 0;
> +}
> +
> +static void virtio_gpu_pci_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
> +    PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
> +
> +    set_bit(DEVICE_CATEGORY_DISPLAY, dc->categories);
> +    dc->props = virtio_gpu_pci_properties;
> +    k->init = virtio_gpu_pci_init;
> +    pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
> +    pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_GPU;
> +    pcidev_k->revision = VIRTIO_PCI_ABI_VERSION;
> +    pcidev_k->class_id = PCI_CLASS_DISPLAY_OTHER;
> +}
> +
> +static void virtio_gpu_initfn(Object *obj)
> +{
> +    VirtIOGPUPCI *dev = VIRTIO_GPU_PCI(obj);
> +    object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_GPU);
> +    object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
> +}
> +
> +static const TypeInfo virtio_gpu_pci_info = {
> +    .name = TYPE_VIRTIO_GPU_PCI,
> +    .parent = TYPE_VIRTIO_PCI,
> +    .instance_size = sizeof(VirtIOGPUPCI),
> +    .instance_init = virtio_gpu_initfn,
> +    .class_init = virtio_gpu_pci_class_init,
> +};
> +
> +static void virtio_gpu_pci_register_types(void)
> +{
> +    type_register_static(&virtio_gpu_pci_info);
> +}
> +type_init(virtio_gpu_pci_register_types)
> diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
> index a273c33..edb4752 100644
> --- a/hw/virtio/virtio-pci.h
> +++ b/hw/virtio/virtio-pci.h
> @@ -24,6 +24,7 @@
>   #include "hw/virtio/virtio-balloon.h"
>   #include "hw/virtio/virtio-bus.h"
>   #include "hw/virtio/virtio-9p.h"
> +#include "hw/virtio/virtio-gpu.h"
>   #ifdef CONFIG_VIRTFS
>   #include "hw/9pfs/virtio-9p.h"
>   #endif
> @@ -39,6 +40,7 @@ typedef struct VirtIOSerialPCI VirtIOSerialPCI;
>   typedef struct VirtIONetPCI VirtIONetPCI;
>   typedef struct VHostSCSIPCI VHostSCSIPCI;
>   typedef struct VirtIORngPCI VirtIORngPCI;
> +typedef struct VirtIOGPUPCI VirtIOGPUPCI;
>   
>   /* virtio-pci-bus */
>   
> @@ -227,6 +229,19 @@ struct VirtIORngPCI {
>       VirtIORNG vdev;
>   };
>   
> +/*
> + * virtio-gpu-pci: This extends VirtioPCIProxy.
> + */
> +#define TYPE_VIRTIO_GPU_PCI "virtio-gpu-pci"
> +#define VIRTIO_GPU_PCI(obj) \
> +        OBJECT_CHECK(VirtIOGPUPCI, (obj), TYPE_VIRTIO_GPU_PCI)
> +
> +struct VirtIOGPUPCI {
> +    VirtIOPCIProxy parent_obj;
> +    VirtIOGPU vdev;
> +};
> +
> +
>   /* Virtio ABI version, if we increment this, we break the guest driver. */
>   #define VIRTIO_PCI_ABI_VERSION          0
>   
> diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
> index bdee464..4a18ef5 100644
> --- a/include/hw/pci/pci.h
> +++ b/include/hw/pci/pci.h
> @@ -81,6 +81,7 @@
>   #define PCI_DEVICE_ID_VIRTIO_SCSI        0x1004
>   #define PCI_DEVICE_ID_VIRTIO_RNG         0x1005
>   #define PCI_DEVICE_ID_VIRTIO_9P          0x1009
> +#define PCI_DEVICE_ID_VIRTIO_GPU         0x1010
>   
>   #define PCI_VENDOR_ID_REDHAT             0x1b36
>   #define PCI_DEVICE_ID_REDHAT_BRIDGE      0x0001

Would you mind adding this to docs/specs/pci-ids.txt?

Max