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Date: Mon, 06 Jul 2026 20:26:28 +0200
Message-Id: <DJRP7FAGEEWU.26PMTHSN6MWMU@kernel.org>
Subject: Re: [PATCH 4/4] drm: nova: Add a GETPARAM parameter to read usable
 VRAM size
Cc: <nova-gpu@lists.linux.dev>, "Alice Ryhl" <aliceryhl@google.com>, "David
 Airlie" <airlied@gmail.com>, "Alexandre Courbot" <acourbot@nvidia.com>,
 "Benno Lossin" <lossin@kernel.org>, "Gary Guo" <gary@garyguo.net>, "Eliot
 Courtney" <ecourtney@nvidia.com>, "John Hubbard" <jhubbard@nvidia.com>,
 <linux-kernel@vger.kernel.org>, <dri-devel@lists.freedesktop.org>,
 <rust-for-linux@vger.kernel.org>
To: "Alistair Popple" <apopple@nvidia.com>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20260706053413.154135-1-apopple@nvidia.com>
 <20260706053413.154135-5-apopple@nvidia.com>
In-Reply-To: <20260706053413.154135-5-apopple@nvidia.com>

On Mon Jul 6, 2026 at 7:34 AM CEST, Alistair Popple wrote:
> +    /// Returns the total usable VRAM size in bytes, i.e. the summed len=
gths of all usable FB
> +    /// regions.
> +    pub(crate) fn vram_size(&self) -> u64 {
> +        self.usable_fb_regions
> +            .iter()
> +            .fold(0, |size, region| size.saturating_add(region.end - reg=
ion.start))
> +    }
>  }

Please make sure to run the rustfmt make target.