linux-kernel - Re: [PATCH v2 3/3] drm/panthor: Enable fdinfo for memory stats

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Message-ID: <ZilCqPlJiTLfNQcG@e110455-lin.cambridge.arm.com>
Date: Wed, 24 Apr 2024 18:34:32 +0100
From: Liviu Dudau <liviu.dudau@....com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	kernel@...labora.com, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] drm/panthor: Enable fdinfo for memory stats

Hello,

On Tue, Apr 23, 2024 at 10:32:36PM +0100, Adrián Larumbe wrote:
> When vm-binding an already-created BO, the entirety of its virtual size is
> then backed by system memory, so its RSS is always the same as its virtual
> size.

How is that relevant to this patch? Or to put it differently: how are your
words describing your code change here?

> 
> Also, we consider a PRIME imported BO to be resident if its matching
> dma_buf has an open attachment, which means its backing storage had already
> been allocated.

Reviewed-by: Liviu Dudau <liviu.dudau@....com>

Best regards,
Liviu

> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
> ---
>  drivers/gpu/drm/panthor/panthor_gem.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
> index d6483266d0c2..386c0dfeeb5f 100644
> --- a/drivers/gpu/drm/panthor/panthor_gem.c
> +++ b/drivers/gpu/drm/panthor/panthor_gem.c
> @@ -143,6 +143,17 @@ panthor_gem_prime_export(struct drm_gem_object *obj, int flags)
>  	return drm_gem_prime_export(obj, flags);
>  }
>  
> +static enum drm_gem_object_status panthor_gem_status(struct drm_gem_object *obj)
> +{
> +	struct panthor_gem_object *bo = to_panthor_bo(obj);
> +	enum drm_gem_object_status res = 0;
> +
> +	if (bo->base.base.import_attach || bo->base.pages)
> +		res |= DRM_GEM_OBJECT_RESIDENT;
> +
> +	return res;
> +}
> +
>  static const struct drm_gem_object_funcs panthor_gem_funcs = {
>  	.free = panthor_gem_free_object,
>  	.print_info = drm_gem_shmem_object_print_info,
> @@ -152,6 +163,7 @@ static const struct drm_gem_object_funcs panthor_gem_funcs = {
>  	.vmap = drm_gem_shmem_object_vmap,
>  	.vunmap = drm_gem_shmem_object_vunmap,
>  	.mmap = panthor_gem_mmap,
> +	.status = panthor_gem_status,
>  	.export = panthor_gem_prime_export,
>  	.vm_ops = &drm_gem_shmem_vm_ops,
>  };
> -- 
> 2.44.0
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
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