linux-kernel - Re: [PATCH drm-next v3 04/15] drm: manager to keep track of GPUs VA mappings

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Date:   Fri, 28 Apr 2023 12:18:13 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Danilo Krummrich <dakr@...hat.com>
Cc:     airlied@...il.com, daniel@...ll.ch, tzimmermann@...e.de,
        mripard@...nel.org, corbet@....net, christian.koenig@....com,
        bskeggs@...hat.com, Liam.Howlett@...cle.com,
        matthew.brost@...el.com, alexdeucher@...il.com, ogabbay@...nel.org,
        bagasdotme@...il.com, willy@...radead.org, jason@...kstrand.net,
        dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH drm-next v3 04/15] drm: manager to keep track of GPUs VA
 mappings

On Tue,  4 Apr 2023 03:27:30 +0200
Danilo Krummrich <dakr@...hat.com> wrote:

> +struct drm_gpuva_manager {
> +	/**
> +	 * @name: the name of the DRM GPU VA space
> +	 */
> +	const char *name;
> +
> +	/**
> +	 * @mm_start: start of the VA space
> +	 */
> +	u64 mm_start;
> +
> +	/**
> +	 * @mm_range: length of the VA space
> +	 */
> +	u64 mm_range;
> +
> +	/**
> +	 * @mtree: the &maple_tree to track GPU VA mappings
> +	 */
> +	struct maple_tree mtree;
> +
> +	/**
> +	 * @kernel_alloc_node:
> +	 *
> +	 * &drm_gpuva representing the address space cutout reserved for
> +	 * the kernel
> +	 */
> +	struct drm_gpuva kernel_alloc_node;
> +
> +	/**
> +	 * @ops: &drm_gpuva_fn_ops providing the split/merge steps to drivers
> +	 */
> +	struct drm_gpuva_fn_ops *ops;

Any reason for not making that a const object (same goes for all the
functions being passed a drm_gpuva_fn_ops)?

> +};