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References: <20230121074253.9774-1-lina@asahilina.net>
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From:   Eric Curtin <ecurtin@redhat.com>
Date:   Sun, 22 Jan 2023 12:07:49 +0000
Message-ID: <CAOgh=FwrkFsst9sdL54jF=aKZRo6PP+TPwcXad_GN4Fiq_b_8g@mail.gmail.com>
Subject: Re: [PATCH] soc: apple: rtkit: Add a private pointer to apple_rtkit_shmem
To:     Asahi Lina <lina@asahilina.net>
Cc:     Hector Martin <marcan@marcan.st>, Sven Peter <sven@svenpeter.dev>,
        Alyssa Rosenzweig <alyssa@rosenzweig.io>,
        asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org
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On Sat, 21 Jan 2023 at 07:53, Asahi Lina <lina@asahilina.net> wrote:
>
> This allows downstream consumers to keep track of private data for shmem
> mappings. In particular, the Rust abstraction will use this to safely
> drop data associated with a mapping when it is unmapped.
>
> Signed-off-by: Asahi Lina <lina@asahilina.net>
> ---

Signed-off-by: Eric Curtin <ecurtin@redhat.com>

>  include/linux/soc/apple/rtkit.h | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/soc/apple/rtkit.h b/include/linux/soc/apple/rtkit.h
> index 62bfa37b5adb..1a9888a1797a 100644
> --- a/include/linux/soc/apple/rtkit.h
> +++ b/include/linux/soc/apple/rtkit.h
> @@ -22,6 +22,7 @@
>   * @size:      Size of the shared memory buffer.
>   * @iova:      Device VA of shared memory buffer.
>   * @is_mapped: Shared memory buffer is managed by the co-processor.
> + * @private:   Private data pointer for the parent driver.
>   */
>
>  struct apple_rtkit_shmem {
> @@ -30,6 +31,7 @@ struct apple_rtkit_shmem {
>         size_t size;
>         dma_addr_t iova;
>         bool is_mapped;
> +       void *private;
>  };
>
>  /*
> --
> 2.35.1
>
>