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SubjectRe: [PATCH v7 5/5] drm/panfrost: Implement generic DRM object RSS reporting function
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Il 27/09/23 23:29, Adrián Larumbe ha scritto:
> BO's RSS is updated every time new pages are allocated on demand and mapped
> for the object at GPU page fault's IRQ handler, but only for heap buffers.
> The reason this is unnecessary for non-heap buffers is that they are mapped
> onto the GPU's VA space and backed by physical memory in their entirety at
> BO creation time.
>
> This calculation is unnecessary for imported PRIME objects, since heap
> buffers cannot be exported by our driver, and the actual BO RSS size is the
> one reported in its attached dmabuf structure.
>
> Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
> Reviewed-by: Steven Price <steven.price@arm.com>
> ---
> drivers/gpu/drm/panfrost/panfrost_gem.c | 15 +++++++++++++++
> drivers/gpu/drm/panfrost/panfrost_gem.h | 5 +++++
> drivers/gpu/drm/panfrost/panfrost_mmu.c | 1 +
> 3 files changed, 21 insertions(+)
>
> diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c
> index 7d8f83d20539..4365434b48db 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_gem.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_gem.c
> @@ -208,6 +208,20 @@ static enum drm_gem_object_status panfrost_gem_status(struct drm_gem_object *obj
> return res;
> }
>
> +static size_t panfrost_gem_rss(struct drm_gem_object *obj)
> +{
> + struct panfrost_gem_object *bo = to_panfrost_bo(obj);
> +
> + if (bo->is_heap) {
> + return bo->heap_rss_size;
> + } else if (bo->base.pages) {
> + WARN_ON(bo->heap_rss_size);
> + return bo->base.base.size;
> + } else {
> + return 0;
> + }

I would do, instead...

......
if (bo->is_heap) {
return bo->heap_rss_size;
} else if (bo->base.pages) {
WARN_ON(bo->heap_rss_size);
return bo->base.base.size;
}

return 0;
}

Apart from that,
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

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