Re: [Qemu-devel] [PATCH v8 7/9] vfio/display: core & wireup

[Kirti Wankhede]

Reviewed By: Kirti Wankhede <address@hidden>

Thanks,
Kirti

On 3/6/2018 5:04 PM, Gerd Hoffmann wrote:
> Infrastructure for display support.  Must be enabled
> using 'display' property.
> 
> Signed-off-by: Gerd Hoffmann <address@hidden>
> ---
>  hw/vfio/pci.h         |  4 ++++
>  hw/vfio/display.c     | 56 
> +++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/vfio/pci.c         | 10 +++++++++
>  hw/vfio/Makefile.objs |  2 +-
>  4 files changed, 71 insertions(+), 1 deletion(-)
>  create mode 100644 hw/vfio/display.c
> 
> diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
> index f4aa13e021..a846cf6237 100644
> --- a/hw/vfio/pci.h
> +++ b/hw/vfio/pci.h
> @@ -133,6 +133,7 @@ typedef struct VFIOPCIDevice {
>  #define VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT 2
>  #define VFIO_FEATURE_ENABLE_IGD_OPREGION \
>                                  (1 << VFIO_FEATURE_ENABLE_IGD_OPREGION_BIT)
> +    OnOffAuto display;
>      int32_t bootindex;
>      uint32_t igd_gms;
>      OffAutoPCIBAR msix_relo;
> @@ -174,4 +175,7 @@ int vfio_pci_igd_opregion_init(VFIOPCIDevice *vdev,
>                                 struct vfio_region_info *info,
>                                 Error **errp);
>  
> +int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp);
> +void vfio_display_finalize(VFIOPCIDevice *vdev);
> +
>  #endif /* HW_VFIO_VFIO_PCI_H */
> diff --git a/hw/vfio/display.c b/hw/vfio/display.c
> new file mode 100644
> index 0000000000..3e997f8a44
> --- /dev/null
> +++ b/hw/vfio/display.c
> @@ -0,0 +1,56 @@
> +/*
> + * display support for mdev based vgpu devices
> + *
> + * Copyright Red Hat, Inc. 2017
> + *
> + * Authors:
> + *    Gerd Hoffmann
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2.  See
> + * the COPYING file in the top-level directory.
> + */
> +
> +#include "qemu/osdep.h"
> +#include <linux/vfio.h>
> +#include <sys/ioctl.h>
> +
> +#include "sysemu/sysemu.h"
> +#include "ui/console.h"
> +#include "qapi/error.h"
> +#include "pci.h"
> +
> +int vfio_display_probe(VFIOPCIDevice *vdev, Error **errp)
> +{
> +    struct vfio_device_gfx_plane_info probe;
> +    int ret;
> +
> +    memset(&probe, 0, sizeof(probe));
> +    probe.argsz = sizeof(probe);
> +    probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_DMABUF;
> +    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
> +    if (ret == 0) {
> +        error_setg(errp, "vfio-display: dmabuf support not implemented yet");
> +        return -1;
> +    }
> +
> +    memset(&probe, 0, sizeof(probe));
> +    probe.argsz = sizeof(probe);
> +    probe.flags = VFIO_GFX_PLANE_TYPE_PROBE | VFIO_GFX_PLANE_TYPE_REGION;
> +    ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_QUERY_GFX_PLANE, &probe);
> +    if (ret == 0) {
> +        error_setg(errp, "vfio-display: region support not implemented yet");
> +        return -1;
> +    }
> +
> +    if (vdev->display == ON_OFF_AUTO_AUTO) {
> +        /* not an error in automatic mode */
> +        return 0;
> +    }
> +
> +    error_setg(errp, "vfio: device doesn't support any (known) display 
> method");
> +    return -1;
> +}
> +
> +void vfio_display_finalize(VFIOPCIDevice *vdev)
> +{
> +}
> diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
> index 033cc8dea1..20f93bef74 100644
> --- a/hw/vfio/pci.c
> +++ b/hw/vfio/pci.c
> @@ -3015,6 +3015,13 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
>          }
>      }
>  
> +    if (vdev->display != ON_OFF_AUTO_OFF) {
> +        ret = vfio_display_probe(vdev, errp);
> +        if (ret) {
> +            goto out_teardown;
> +        }
> +    }
> +
>      vfio_register_err_notifier(vdev);
>      vfio_register_req_notifier(vdev);
>      vfio_setup_resetfn_quirk(vdev);
> @@ -3035,6 +3042,7 @@ static void vfio_instance_finalize(Object *obj)
>      VFIOPCIDevice *vdev = DO_UPCAST(VFIOPCIDevice, pdev, pci_dev);
>      VFIOGroup *group = vdev->vbasedev.group;
>  
> +    vfio_display_finalize(vdev);
>      vfio_bars_finalize(vdev);
>      g_free(vdev->emulated_config_bits);
>      g_free(vdev->rom);
> @@ -3123,6 +3131,8 @@ static void vfio_instance_init(Object *obj)
>  static Property vfio_pci_dev_properties[] = {
>      DEFINE_PROP_PCI_HOST_DEVADDR("host", VFIOPCIDevice, host),
>      DEFINE_PROP_STRING("sysfsdev", VFIOPCIDevice, vbasedev.sysfsdev),
> +    DEFINE_PROP_ON_OFF_AUTO("display", VFIOPCIDevice,
> +                            display, ON_OFF_AUTO_AUTO),
>      DEFINE_PROP_UINT32("x-intx-mmap-timeout-ms", VFIOPCIDevice,
>                         intx.mmap_timeout, 1100),
>      DEFINE_PROP_BIT("x-vga", VFIOPCIDevice, features,
> diff --git a/hw/vfio/Makefile.objs b/hw/vfio/Makefile.objs
> index c3ab9097f1..a2e7a0a7cf 100644
> --- a/hw/vfio/Makefile.objs
> +++ b/hw/vfio/Makefile.objs
> @@ -1,6 +1,6 @@
>  ifeq ($(CONFIG_LINUX), y)
>  obj-$(CONFIG_SOFTMMU) += common.o
> -obj-$(CONFIG_PCI) += pci.o pci-quirks.o
> +obj-$(CONFIG_PCI) += pci.o pci-quirks.o display.o
>  obj-$(CONFIG_VFIO_CCW) += ccw.o
>  obj-$(CONFIG_SOFTMMU) += platform.o
>  obj-$(CONFIG_VFIO_XGMAC) += calxeda-xgmac.o
>