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

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Date:   Fri, 21 Apr 2023 12:46:22 +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>,
        donald.robson@...tec.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:

> +/**
> + * drm_gpuva_prealloc_create - creates a preallocated node to store a
> + * &drm_gpuva entry.
> + *
> + * Returns: the &drm_gpuva_prealloc object on success, NULL on failure
> + */
> +struct drm_gpuva_prealloc *
> +drm_gpuva_prealloc_create(void)
> +{
> +	struct drm_gpuva_prealloc *pa;
> +
> +	pa = kzalloc(sizeof(*pa), GFP_KERNEL);
> +	if (!pa)
> +		return NULL;
> +
> +	if (mas_preallocate(&pa->mas, GFP_KERNEL)) {

mas_preallocate() needs a valid tree field to calculate the number
of nodes to pre-allocate. I guess we're missing a MA_STATE_INIT() here,
and we need to pass a gpuva_mgr object to this helper.

> +		kfree(pa);
> +		return NULL;
> +	}
> +
> +	return pa;
> +}
> +EXPORT_SYMBOL(drm_gpuva_prealloc_create);