linux-kernel - Re: [PATCH v5 04/28] fpga: mgr: add compat

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Date:   Mon, 7 May 2018 16:09:06 -0500
From:   Alan Tull <atull@...nel.org>
To:     Wu Hao <hao.wu@...el.com>
Cc:     Moritz Fischer <mdf@...nel.org>, linux-fpga@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-api@...r.kernel.org, "Kang, Luwei" <luwei.kang@...el.com>,
        "Zhang, Yi Z" <yi.z.zhang@...el.com>
Subject: Re: [PATCH v5 04/28] fpga: mgr: add compat_id support

On Tue, May 1, 2018 at 9:50 PM, Wu Hao <hao.wu@...el.com> wrote:

Hi Hao,

Looks good!

> This patch introduces compat_id support to fpga manager, it adds
> a fpga_compat_id pointer to fpga manager data structure to allow
> fpga manager drivers to save the compatibility id. This compat_id
> could be used for compatibility checking before doing partial
> reconfiguration to associated fpga regions.
>
> Signed-off-by: Wu Hao <hao.wu@...el.com>
Acked-by: Alan Tull <atull@...nel.org>

> ---
>  include/linux/fpga/fpga-mgr.h | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
> index 802eac8..f163f22 100644
> --- a/include/linux/fpga/fpga-mgr.h
> +++ b/include/linux/fpga/fpga-mgr.h
> @@ -147,11 +147,23 @@ struct fpga_manager_ops {
>  #define FPGA_MGR_STATUS_FIFO_OVERFLOW_ERR      BIT(4)
>
>  /**
> + * struct fpga_compat_id - id for compatibility check
> + *
> + * @id_h: high 64bit of the compat_id
> + * @id_l: low 64bit of the compat_id
> + */
> +struct fpga_compat_id {
> +       u64 id_h;
> +       u64 id_l;
> +};
> +
> +/**
>   * struct fpga_manager - fpga manager structure
>   * @name: name of low level fpga manager
>   * @dev: fpga manager device
>   * @ref_mutex: only allows one reference to fpga manager
>   * @state: state of fpga manager
> + * @compat_id: FPGA manager id for compatibility check.
>   * @mops: pointer to struct of fpga manager ops
>   * @priv: low level driver private date
>   */
> @@ -160,6 +172,7 @@ struct fpga_manager {
>         struct device dev;
>         struct mutex ref_mutex;
>         enum fpga_mgr_states state;
> +       struct fpga_compat_id *compat_id;
>         const struct fpga_manager_ops *mops;
>         void *priv;
>  };
> --
> 1.8.3.1
>