[PATCH 0/3] drm/amdgpu: modernize virtual display feature

Ryan Taylor Ryan.Taylor at amd.com
Wed Jul 21 17:07:02 UTC 2021

The amdgpu vkms interface provides a virtual KMS interface for several use
cases: devices without display hardware, platforms where the actual display
hardware is not useful (e.g., servers), SR-IOV virtual functions, device
emulation/simulation, and device bring up prior to display hardware being
usable. We previously emulated a legacy KMS interface, but there was a desire
to move to the atomic KMS interface. The vkms driver did everything we
needed, but we wanted KMS support natively in the driver without buffer
sharing and the ability to support an instance of VKMS per device. We first
looked at splitting vkms into a stub driver and a helper module that other
drivers could use to implement a virtual display, but this strategy ended up
being messy due to driver specific callbacks needed for buffer management.
Ultimately, it proved easier to import the vkms code as it mostly used core
drm helpers anyway.

Ryan Taylor (3):
  drm/amdgpu: create amdgpu_vkms (v2)
  drm/amdgpu: cleanup dce_virtual
  drm/amdgpu: replace dce_virtual with amdgpu_vkms (v3)

 drivers/gpu/drm/amd/amdgpu/Makefile      |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu.h      |   1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c   |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c | 639 +++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h |  26 +
 drivers/gpu/drm/amd/amdgpu/cik.c         |  10 +-
 drivers/gpu/drm/amd/amdgpu/dce_virtual.c | 780 -----------------------
 drivers/gpu/drm/amd/amdgpu/dce_virtual.h |  30 -
 drivers/gpu/drm/amd/amdgpu/nv.c          |  20 +-
 drivers/gpu/drm/amd/amdgpu/si.c          |   8 +-
 drivers/gpu/drm/amd/amdgpu/soc15.c       |  10 +-
 drivers/gpu/drm/amd/amdgpu/vi.c          |  14 +-
 13 files changed, 700 insertions(+), 844 deletions(-)
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.h
 delete mode 100644 drivers/gpu/drm/amd/amdgpu/dce_virtual.c
 delete mode 100644 drivers/gpu/drm/amd/amdgpu/dce_virtual.h

base-commit: cfd09f1e35231aa7f69845b6195e7d935e81421d

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