linux-kernel - Re: [PATCH 05/11] firmware: arm_scmi: Add receive buffer support for notifications

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Message-ID: <CA+-6iNzgXj5iF5k73s6x0Ot4Wcx7UrkQpStUOyNFmBfyTJMKDw@mail.gmail.com>
Date:   Thu, 18 Jul 2019 17:24:48 -0400
From:   Jim Quinlan <james.quinlan@...adcom.com>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Peng Fan <peng.fan@....com>,
        Bo Zhang <bozhang.zhang@...adcom.com>,
        Volodymyr Babchuk <volodymyr_babchuk@...m.com>
Subject: Re: [PATCH 05/11] firmware: arm_scmi: Add receive buffer support for notifications

Hi Sudeep,

Would it make sense to save commits that support notifications for
when you actually support them (correct me if I wrong, but this
commit-set does not implement notifications.

Jim

On Mon, Jul 8, 2019 at 11:47 AM Sudeep Holla <sudeep.holla@....com> wrote:
>
> With all the plumbing in place, let's just add the separate dedicated
> receive buffers to handle notifications that can arrive asynchronously
> from the platform firmware to OS.
>
> Also add check to see if the platform supports any receive channels
> before allocating the receive buffers.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> ---
>  drivers/firmware/arm_scmi/driver.c | 24 ++++++++++++++++++------
>  1 file changed, 18 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c
> index 1a7ffd3f8534..eb5a2f271806 100644
> --- a/drivers/firmware/arm_scmi/driver.c
> +++ b/drivers/firmware/arm_scmi/driver.c
> @@ -112,6 +112,7 @@ struct scmi_chan_info {
>   * @version: SCMI revision information containing protocol version,
>   *     implementation version and (sub-)vendor identification.
>   * @tx_minfo: Universal Transmit Message management info
> + * @rx_minfo: Universal Receive Message management info
>   * @tx_idr: IDR object to map protocol id to Tx channel info pointer
>   * @rx_idr: IDR object to map protocol id to Rx channel info pointer
>   * @protocols_imp: List of protocols implemented, currently maximum of
> @@ -125,6 +126,7 @@ struct scmi_info {
>         struct scmi_revision_info version;
>         struct scmi_handle handle;
>         struct scmi_xfers_info tx_minfo;
> +       struct scmi_xfers_info rx_minfo;
>         struct idr tx_idr;
>         struct idr rx_idr;
>         u8 *protocols_imp;
> @@ -615,13 +617,13 @@ int scmi_handle_put(const struct scmi_handle *handle)
>         return 0;
>  }
>
> -static int scmi_xfer_info_init(struct scmi_info *sinfo)
> +static int __scmi_xfer_info_init(struct scmi_info *sinfo, bool tx)
>  {
>         int i;
>         struct scmi_xfer *xfer;
>         struct device *dev = sinfo->dev;
>         const struct scmi_desc *desc = sinfo->desc;
> -       struct scmi_xfers_info *info = &sinfo->tx_minfo;
> +       struct scmi_xfers_info *info = tx ? &sinfo->tx_minfo : &sinfo->rx_minfo;
>
>         /* Pre-allocated messages, no more than what hdr.seq can support */
>         if (WARN_ON(desc->max_msg >= MSG_TOKEN_MAX)) {
> @@ -656,6 +658,16 @@ static int scmi_xfer_info_init(struct scmi_info *sinfo)
>         return 0;
>  }
>
> +static int scmi_xfer_info_init(struct scmi_info *sinfo)
> +{
> +       int ret = __scmi_xfer_info_init(sinfo, true);
> +
> +       if (!ret && idr_find(&sinfo->rx_idr, SCMI_PROTOCOL_BASE))
> +               ret = __scmi_xfer_info_init(sinfo, false);
> +
> +       return ret;
> +}
> +
>  static int scmi_mailbox_check(struct device_node *np, int idx)
>  {
>         return of_parse_phandle_with_args(np, "mboxes", "#mbox-cells",
> @@ -792,10 +804,6 @@ static int scmi_probe(struct platform_device *pdev)
>         info->desc = desc;
>         INIT_LIST_HEAD(&info->node);
>
> -       ret = scmi_xfer_info_init(info);
> -       if (ret)
> -               return ret;
> -
>         platform_set_drvdata(pdev, info);
>         idr_init(&info->tx_idr);
>         idr_init(&info->rx_idr);
> @@ -808,6 +816,10 @@ static int scmi_probe(struct platform_device *pdev)
>         if (ret)
>                 return ret;
>
> +       ret = scmi_xfer_info_init(info);
> +       if (ret)
> +               return ret;
> +
>         ret = scmi_base_protocol_init(handle);
>         if (ret) {
>                 dev_err(dev, "unable to communicate with SCMI(%d)\n", ret);
> --
> 2.17.1
>