So far the DRM GPUVA manager offers common infrastructure to track GPU VA allocations and mappings, generically connect GPU VA mappings to their backing buffers and perform more complex mapping operations on the GPU VA space. However, there are more design patterns commonly used by drivers, which can potentially be generalized in order to make the DRM GPUVA manager represent a basic GPU-VM implementation. In this context, this patch series aims at generalizing the following elements. 1) Provide a common dma-resv for GEM objects not being used outside of this GPU-VM. 2) Provide tracking of external GEM objects (GEM objects which are shared with other GPU-VMs). 3) Provide functions to efficiently lock all GEM objects dma-resv the GPU-VM contains mappings of. 4) Provide tracking of evicted GEM objects the GPU-VM contains mappings of, such that validation of evicted GEM objects is accelerated. 5) Provide some convinience functions for common patterns. Rather than being designed as a "framework", the target is to make all features appear as a collection of optional helper functions, such that drivers are free to make use of the DRM GPUVA managers basic functionality and opt-in for other features without setting any feature flags, just by making use of the corresponding functions. The implementation introduces struct drm_gpuva_gem, which serves as abstraction combining a struct drm_gpuva_manager and struct drm_gem_object, similar to what amdgpu does with struct amdgpu_bo_vm. While this adds a bit of complexity it improves the efficiency of tracking evicted GEM objects. [1] provides an alternative implementation using a maple_tree, resulting into a fairly simpler API. [2] points to the full patch series providing the alternative implementation. [3] points to this patch series. [1] https://gitlab.freedesktop.org/nouvelles/kernel/-/commit/2a7e1b0ece2c3bba43376783b577d97ae6f6e54f [2] https://gitlab.freedesktop.org/nouvelles/kernel/-/commits/gpuva-vm-resv [3] https://gitlab.freedesktop.org/nouvelles/kernel/-/commits/gpuva-vm-resv-vm-bo Danilo Krummrich (3): drm: drm_exec: build always builtin drm/gpuva_mgr: generalize dma_resv/extobj handling and GEM validation drm/nouveau: gpuva mgr dma-resv/extobj handling, GEM validation drivers/gpu/drm/Kconfig | 6 - drivers/gpu/drm/Makefile | 3 +- drivers/gpu/drm/drm_gpuva_mgr.c | 688 +++++++++++++++++++++++- drivers/gpu/drm/nouveau/Kconfig | 1 - drivers/gpu/drm/nouveau/nouveau_bo.c | 4 +- drivers/gpu/drm/nouveau/nouveau_exec.c | 51 +- drivers/gpu/drm/nouveau/nouveau_gem.c | 4 +- drivers/gpu/drm/nouveau/nouveau_sched.h | 2 - drivers/gpu/drm/nouveau/nouveau_uvmm.c | 191 +++++-- include/drm/drm_gem.h | 48 +- include/drm/drm_gpuva_mgr.h | 302 ++++++++++- 11 files changed, 1161 insertions(+), 139 deletions(-) base-commit: 25205087df1ffe06ccea9302944ed1f77dc68c6f -- 2.41.0
