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RE: [PATCH 00/11] Add support for Blob resources feature
From: |
Kasireddy, Vivek |
Subject: |
RE: [PATCH 00/11] Add support for Blob resources feature |
Date: |
Tue, 13 Apr 2021 06:10:19 +0000 |
Hi Gerd,
While looking at the Qemu UI code, I noticed that there is a Blit operation
performed to copy the Guest FB (texture) into a Host buffer before it is
presented
to the Host compositor. I was wondering if there are any elegant ways to
eliminate this Blit to further the goal of absolute zero-copy. One idea that I
am
familiar with involves the usage of this extension:
https://www.khronos.org/registry/EGL/extensions/WL/EGL_WL_create_wayland_buffer_from_image.txt
However, I do realize that this is very Wayland specific but we are also going
to need
to add explicit sync support which is currently only available in upstream
Weston.
I did try adding explicit sync support to GTK but the maintainers are not
particularly
thrilled about it:
https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/3410
Any other ideas as to how to eliminate that Blit cleanly?
Thanks,
Vivek
> -----Original Message-----
> From: Kasireddy, Vivek <vivek.kasireddy@intel.com>
> Sent: Tuesday, March 30, 2021 8:10 PM
> To: qemu-devel@nongnu.org
> Cc: Kasireddy, Vivek <vivek.kasireddy@intel.com>; Gerd Hoffmann
> <kraxel@redhat.com>; Marc-André Lureau <marcandre.lureau@redhat.com>; Kim,
> Dongwon <dongwon.kim@intel.com>; Zhang, Tina <tina.zhang@intel.com>
> Subject: [PATCH 00/11] Add support for Blob resources feature
>
> Enabling this feature would eliminate data copies from the resource object in
> the Guest to
> the shadow resource in Qemu. This patch series however adds support only for
> Blobs of
> type VIRTIO_GPU_BLOB_MEM_GUEST with property
> VIRTIO_GPU_BLOB_FLAG_USE_SHAREABLE.
>
> Most of the patches in this series are a rebased, refactored and bugfixed
> versions of Gerd
> Hoffmann's patches located here:
> https://gitlab.freedesktop.org/virgl/qemu/-/commits/virtio-gpu-next
>
> TODO:
> - Enable the combination virgl + blob resources
> - Add support for VIRTGPU_BLOB_MEM_HOST3D blobs
>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Marc-André Lureau <marcandre.lureau@redhat.com>
> Cc: Dongwon Kim <dongwon.kim@intel.com>
> Cc: Tina Zhang <tina.zhang@intel.com>
>
> Vivek Kasireddy (11):
> ui: Get the fd associated with udmabuf driver
> ui/pixman: Add qemu_pixman_to_drm_format()
> virtio-gpu: Add udmabuf helpers
> virtio-gpu: Add virtio_gpu_find_check_resource
> virtio-gpu: Refactor virtio_gpu_set_scanout
> virtio-gpu: Refactor virtio_gpu_create_mapping_iov
> virtio-gpu: Add initial definitions for blob resources
> virtio-gpu: Add virtio_gpu_resource_create_blob
> virtio-gpu: Add helpers to create and destroy dmabuf objects
> virtio-gpu: Add virtio_gpu_set_scanout_blob
> virtio-gpu: Update cursor data using blob
>
> hw/display/meson.build | 2 +-
> hw/display/trace-events | 2 +
> hw/display/virtio-gpu-3d.c | 3 +-
> hw/display/virtio-gpu-base.c | 3 +
> hw/display/virtio-gpu-udmabuf.c | 276 +++++++++++++
> hw/display/virtio-gpu.c | 423 +++++++++++++++-----
> include/hw/virtio/virtio-gpu-bswap.h | 16 +
> include/hw/virtio/virtio-gpu.h | 41 +-
> include/standard-headers/linux/udmabuf.h | 32 ++
> include/standard-headers/linux/virtio_gpu.h | 1 +
> include/ui/console.h | 3 +
> include/ui/qemu-pixman.h | 1 +
> scripts/update-linux-headers.sh | 3 +
> ui/meson.build | 1 +
> ui/qemu-pixman.c | 35 +-
> ui/udmabuf.c | 40 ++
> 16 files changed, 772 insertions(+), 110 deletions(-) create mode 100644
> hw/display/virtio-gpu-udmabuf.c create mode 100644 include/standard-
> headers/linux/udmabuf.h
> create mode 100644 ui/udmabuf.c
>
> --
> 2.26.2
- RE: [PATCH 00/11] Add support for Blob resources feature,
Kasireddy, Vivek <=