Re: [PATCH v2 16/32] Introduce drm_gpuvm_sm_map_ops_flags enums for sm_map_ops

[Boris Brezillon <boris.brezillon@collabora.com>]

On Mon,  7 Apr 2025 15:47:03 +0530
Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com> wrote:

> - DRM_GPUVM_SM_MAP_NOT_MADVISE: Default sm_map operations for the input
>   range.
> 
> - DRM_GPUVM_SKIP_GEM_OBJ_VA_SPLIT_MADVISE: This flag is used by
>   drm_gpuvm_sm_map_ops_create to iterate over GPUVMA's in the
> user-provided range and split the existing non-GEM object VMA if the
> start or end of the input range lies within it. The operations can
> create up to 2 REMAPS and 2 MAPs. The purpose of this operation is to be
> used by the Xe driver to assign attributes to GPUVMA's within the
> user-defined range. Unlike drm_gpuvm_sm_map_ops_flags in default mode,
> the operation with this flag will never have UNMAPs and
> merges, and can be without any final operations.
> 
> v2
> - use drm_gpuvm_sm_map_ops_create with flags instead of defining new
>   ops_create (Danilo)
> - Add doc (Danilo)
> 
> Cc: Danilo Krummrich <dakr@redhat.com>
> Cc: Matthew Brost <matthew.brost@intel.com>
> Cc: Boris Brezillon <bbrezillon@kernel.org>
> Cc: <dri-devel@lists.freedesktop.org>
> Signed-off-by: Himal Prasad Ghimiray<himal.prasad.ghimiray@intel.com>
> 
> ---
> RFC Link:
> https://lore.kernel.org/intel-xe/20250314080226.2059819-1-himal.prasad.ghimiray@intel.com/T/#mb706bd1c55232110e42dc7d5c05de61946982472
> ---
>  drivers/gpu/drm/drm_gpuvm.c            | 93 ++++++++++++++++++++------
>  drivers/gpu/drm/nouveau/nouveau_uvmm.c |  1 +
>  drivers/gpu/drm/xe/xe_vm.c             |  1 +
>  include/drm/drm_gpuvm.h                | 25 ++++++-
>  4 files changed, 98 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c
> index f9eb56f24bef..9d09d177b9fa 100644
> --- a/drivers/gpu/drm/drm_gpuvm.c
> +++ b/drivers/gpu/drm/drm_gpuvm.c
> @@ -2102,10 +2102,13 @@ static int
>  __drm_gpuvm_sm_map(struct drm_gpuvm *gpuvm,
>  		   const struct drm_gpuvm_ops *ops, void *priv,
>  		   u64 req_addr, u64 req_range,
> +		   enum drm_gpuvm_sm_map_ops_flags flags,
>  		   struct drm_gem_object *req_obj, u64 req_offset)

Not exactly related to this series, but I've been playing with Lina's
series[1] which is hooking up flag propagation from _map() calls to
drm_gpuva, and I think we should pass all map args through a struct so
we don't have to change all call-sites anytime we add one a new optional
argument. Here's a patch [2] doing that.

[1]https://lore.kernel.org/lkml/4a431b98-cccc-495e-b72e-02362828c96b@asahilina.net/T/
[2]https://gitlab.freedesktop.org/bbrezillon/linux/-/commit/0587c15b9b81ccae1e37ad0a5d524754d8455558