[v1,0/7] Add virtio gpu userptr support

Message

Honglei Huang Feb. 28, 2025, 5:36 a.m. UTC

From: Honglei Huang <[e-mail]>

Hello,

This series add virtio gpu userptr support and add libhsakmt capset.
The userptr feature is used for let host access guest user space memory,
this feature is used for GPU compute use case, to enable ROCm/OpenCL native
context. It should be pointed out that we are not to implement SVM here, 
this is just a buffer based userptr implementation.
The libhsakmt capset is used for ROCm context, libhsakmt is like the role 
of libdrm in Mesa.

Patches 1-2 add libhsakmt capset and userptr blob resource flag.
Patches 3-5 implement basic userptr feature, in some popular bench marks,
it has an efficiency of about 70% compared to bare metal in OpenCL API.
Patche 6 adds interval tree.
Patche 7 adds MMU notifier, let UMD do not need to manage userptr and
increase efficiency by 20% to 30%. With this patch, OpenCL in ROCm can
achieve 95%+ efficiency compared to bare metal in some popular bench marks.

Honglei Huang (7):
  virtio-gpu api: add blob userptr resource
  drm/virtgpu api: add blob userptr resource
  drm/virtio: implement userptr: probe for the feature
  drm/virtio: implement userptr: add userptr obj
  drm/virtio: advertise base userptr feature to userspace
  drm/virtio: implement userptr: add interval tree
  drm/virtio: implement userptr: add mmu notifier

 drivers/gpu/drm/virtio/Makefile          |   3 +-
 drivers/gpu/drm/virtio/virtgpu_debugfs.c |   1 +
 drivers/gpu/drm/virtio/virtgpu_drv.c     |   1 +
 drivers/gpu/drm/virtio/virtgpu_drv.h     |  91 +++
 drivers/gpu/drm/virtio/virtgpu_ioctl.c   |  22 +-
 drivers/gpu/drm/virtio/virtgpu_kms.c     |  10 +-
 drivers/gpu/drm/virtio/virtgpu_object.c  |   5 +
 drivers/gpu/drm/virtio/virtgpu_userptr.c | 766 +++++++++++++++++++++++
 include/uapi/drm/virtgpu_drm.h           |   5 +-
 include/uapi/linux/virtio_gpu.h          |   7 +
 10 files changed, 905 insertions(+), 6 deletions(-)
 create mode 100644 drivers/gpu/drm/virtio/virtgpu_userptr.c