linux-kernel - Re: [PATCH 1/2] ARM: dts: stm32: Setup 4M bytes reserved memory for mmap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAL9mu0KWq-ANkLBRv_49kGzWf_kDPjMvMeA7S4E6f5MpVtjKaw@mail.gmail.com>
Date:   Tue, 9 Jun 2020 23:58:32 +0800
From:   dillon min <dillon.minfei@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux@...linux.org.uk, Vladimir Murzin <vladimir.murzin@....com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        allison@...utok.net, info@...ux.net, tglx@...utronix.de, hch@....de
Cc:     "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-stm32@...md-mailman.stormreply.com,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] ARM: dts: stm32: Setup 4M bytes reserved memory for mmap

Hi Christoph Hellwig,

This is the patchset. for your reference.

thanks,

On Mon, Jun 8, 2020 at 4:30 PM <dillon.minfei@...il.com> wrote:
>
> From: dillon min <dillon.minfei@...il.com>
>
> To mmap a framebuffer or v4l2 buffer from kernel to userspace on
> no-mmu platform, we need rely on 'arm_nommu_dma_ops' from
> arch/arm/mm/dma-mapping-nommu.c , so setup 4M bytes memory
> reserved for this purpose.
>
> Signed-off-by: dillon min <dillon.minfei@...il.com>
> ---
>  arch/arm/boot/dts/stm32f469-disco.dts | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>
> diff --git a/arch/arm/boot/dts/stm32f469-disco.dts b/arch/arm/boot/dts/stm32f469-disco.dts
> index 9397db0c43de..082b24ee81f7 100644
> --- a/arch/arm/boot/dts/stm32f469-disco.dts
> +++ b/arch/arm/boot/dts/stm32f469-disco.dts
> @@ -65,6 +65,20 @@
>                 reg = <0x00000000 0x1000000>;
>         };
>
> +       reserved-memory {
> +               #address-cells = <1>;
> +               #size-cells = <1>;
> +               ranges;
> +
> +               linux,dma {
> +                       compatible = "shared-dma-pool";
> +                       size = <0x400000>;
> +                       no-map;
> +                       linux,dma-default;
> +               };
> +
> +       };
> +
>         aliases {
>                 serial0 = &usart3;
>         };
> --
> 2.7.4
>