On Mon, 2023-10-23 at 22:16 +0200, Danilo Krummrich wrote: > Add an abstraction layer between the drm_gpuva mappings of a > particular > drm_gem_object and this GEM object itself. The abstraction represents > a > combination of a drm_gem_object and drm_gpuvm. The drm_gem_object > holds > a list of drm_gpuvm_bo structures (the structure representing this > abstraction), while each drm_gpuvm_bo contains list of mappings of > this > GEM object. > > This has multiple advantages: > > 1) We can use the drm_gpuvm_bo structure to attach it to various > lists > of the drm_gpuvm. This is useful for tracking external and evicted > objects per VM, which is introduced in subsequent patches. > > 2) Finding mappings of a certain drm_gem_object mapped in a certain > drm_gpuvm becomes much cheaper. > > 3) Drivers can derive and extend the structure to easily represent > driver specific states of a BO for a certain GPUVM. > > The idea of this abstraction was taken from amdgpu, hence the credit > for > this idea goes to the developers of amdgpu. > > Cc: Christian König <christian.koenig@xxxxxxx> > Signed-off-by: Danilo Krummrich <dakr@xxxxxxxxxx> > --- > drivers/gpu/drm/drm_gpuvm.c | 335 +++++++++++++++++++++-- > -- > drivers/gpu/drm/nouveau/nouveau_uvmm.c | 64 +++-- > include/drm/drm_gem.h | 32 +-- > include/drm/drm_gpuvm.h | 188 +++++++++++++- > 4 files changed, 533 insertions(+), 86 deletions(-) That checkpatch.pl error still remains as well. Thanks, Thomas
