linux-kernel - Re: [PATCH] soc: apple: rtkit: Add a private pointer to apple_rtkit

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Date:   Sun, 22 Jan 2023 12:07:49 +0000
From:   Eric Curtin <ecurtin@...hat.com>
To:     Asahi Lina <lina@...hilina.net>
Cc:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: apple: rtkit: Add a private pointer to apple_rtkit_shmem

On Sat, 21 Jan 2023 at 07:53, Asahi Lina <lina@...hilina.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@...hilina.net>
> ---

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