Re: [PATCH v9 14/42] drm/msm: Convert vm locking

[Danilo Krummrich]

On 6/29/25 10:12 PM, Rob Clark wrote:
> +	/*
> +	 * We mostly want to use DRM_GPUVM_RESV_PROTECTED, except that
> +	 * makes drm_gpuvm_bo_evict() a no-op for extobjs (ie. we loose
> +	 * tracking that an extobj is evicted) :facepalm:
> +	 */

Yeah, it's a consequence of this locking scheme and I really hate it. However,
you don't entirely loose tracking:

The next time you call drm_gpuvm_prepare_objects() it will be added to the list
[1] and hence picked up by subsequent validation through drm_gpuvm_validate().

[1] https://elixir.bootlin.com/linux/v6.16/source/drivers/gpu/drm/drm_gpuvm.c#L1154