linux-kernel - Re: [PATCH drm-misc-next v3 4/7] drm/gpuvm: common dma-resv per struct drm

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Date:   Mon, 11 Sep 2023 14:00:35 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Danilo Krummrich <dakr@...hat.com>
Cc:     airlied@...il.com, daniel@...ll.ch, matthew.brost@...el.com,
        thomas.hellstrom@...ux.intel.com, sarah.walker@...tec.com,
        donald.robson@...tec.com, christian.koenig@....com,
        faith.ekstrand@...labora.com, dri-devel@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH drm-misc-next v3 4/7] drm/gpuvm: common dma-resv per
 struct drm_gpuvm

On Sat,  9 Sep 2023 17:31:11 +0200
Danilo Krummrich <dakr@...hat.com> wrote:

> @@ -240,9 +240,22 @@ struct drm_gpuvm {
>  	 * @ops: &drm_gpuvm_ops providing the split/merge steps to drivers
>  	 */
>  	const struct drm_gpuvm_ops *ops;
> +
> +	/**
> +	 * @d_obj: Dummy GEM object; used internally to pass the GPU VMs
> +	 * dma-resv to &drm_exec.
> +	 */
> +	struct drm_gem_object d_obj;
> +
> +	/**
> +	 * @resv: the &dma_resv for &drm_gem_objects mapped in this GPU VA
> +	 * space
> +	 */
> +	struct dma_resv *resv;

Hm, I'd be tempted to drop this field and add a drm_gpuvm_resv() helper
returning vm->d_obj.resv;

>  };