linux-kernel - Re: [PATCH v13 05/11] remoteproc: mediatek: Introduce cluster on single-core SCP

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Message-ID: <d8053fc1-cace-b14b-57c6-387c0d664837@collabora.com>
Date:   Wed, 7 Jun 2023 09:43:06 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Tinghan Shen <tinghan.shen@...iatek.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v13 05/11] remoteproc: mediatek: Introduce cluster on
 single-core SCP

Il 07/06/23 09:22, Tinghan Shen ha scritto:
> This is the preliminary step for probing multi-core SCP.
> The initialization procedure for remoteproc is similar for both
> single-core and multi-core architectures and is reusing to avoid
> redundant code.
> 
> Rewrite the probing flow of single-core SCP to adapt with the 'cluster'
> concept needed by probing the multi-core SCP. The main differences
> are,
> - the SCP core object(s) is maintained at the cluster list instead of at
>    the platofmr device driver data property.

s/platofmr/platform/g

> - save the cluster information at the platofmr device driver data property.
> - In order to keep the compatibility of exported SCP APIs which getting
>    the SCP core object by SCP node phandle, move the SCP core object
>    pointers to the platform device platform data property.
> 
> The registers of config and l1tcm are shared for multi-core
> SCP. Reuse the mapped addresses for all cores.
> 
> Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> ---
>   drivers/remoteproc/mtk_common.h |   2 +
>   drivers/remoteproc/mtk_scp.c    | 151 +++++++++++++++++++++++---------
>   2 files changed, 112 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> index c0905aec3b4b..56395e8664cb 100644
> --- a/drivers/remoteproc/mtk_common.h
> +++ b/drivers/remoteproc/mtk_common.h
> @@ -128,6 +128,8 @@ struct mtk_scp {
>   	size_t dram_size;
>   
>   	struct rproc_subdev *rpmsg_subdev;
> +
> +	struct list_head elem;
>   };
>   
>   /**
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index d66822dad943..c8fc6b46f82b 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -23,6 +23,14 @@
>   #define MAX_CODE_SIZE 0x500000
>   #define SECTION_NAME_IPI_BUFFER ".ipi_buffer"
>   
> +struct mtk_scp_of_cluster {
> +	void __iomem *reg_base;
> +	void __iomem *l1tcm_base;
> +	size_t l1tcm_size;
> +	phys_addr_t l1tcm_phys;
> +	struct list_head mtk_scp_list;
> +};
> +
>   /**
>    * scp_get() - get a reference to SCP.
>    *
> @@ -51,7 +59,7 @@ struct mtk_scp *scp_get(struct platform_device *pdev)
>   		return NULL;
>   	}
>   
> -	return platform_get_drvdata(scp_pdev);
> +	return *(struct mtk_scp **)dev_get_platdata(&scp_pdev->dev);
>   }
>   EXPORT_SYMBOL_GPL(scp_get);
>   
> @@ -810,14 +818,14 @@ static void scp_unmap_memory_region(struct mtk_scp *scp)
>   static int scp_register_ipi(struct platform_device *pdev, u32 id,
>   			    ipi_handler_t handler, void *priv)
>   {
> -	struct mtk_scp *scp = platform_get_drvdata(pdev);
> +	struct mtk_scp *scp = *(struct mtk_scp **)dev_get_platdata(&pdev->dev);
>   
>   	return scp_ipi_register(scp, id, handler, priv);
>   }
>   
>   static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
>   {
> -	struct mtk_scp *scp = platform_get_drvdata(pdev);
> +	struct mtk_scp *scp = *(struct mtk_scp **)dev_get_platdata(&pdev->dev);
>   
>   	scp_ipi_unregister(scp, id);
>   }
> @@ -825,7 +833,7 @@ static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
>   static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
>   			unsigned int len, unsigned int wait)
>   {
> -	struct mtk_scp *scp = platform_get_drvdata(pdev);
> +	struct mtk_scp *scp = *(struct mtk_scp **)dev_get_platdata(&pdev->dev);
>   
>   	return scp_ipi_send(scp, id, buf, len, wait);
>   }
> @@ -855,7 +863,8 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
>   	}
>   }
>   
> -static int scp_probe(struct platform_device *pdev)
> +static struct mtk_scp *scp_rproc_init(struct platform_device *pdev,
> +				      struct mtk_scp_of_cluster *scp_cluster)
>   {
>   	struct device *dev = &pdev->dev;
>   	struct device_node *np = dev->of_node;
> @@ -867,52 +876,42 @@ static int scp_probe(struct platform_device *pdev)
>   
>   	ret = rproc_of_parse_firmware(dev, 0, &fw_name);
>   	if (ret < 0 && ret != -EINVAL)
> -		return ret;
> +		return ERR_PTR(ret);
>   
>   	rproc = devm_rproc_alloc(dev, np->name, &scp_ops, fw_name, sizeof(*scp));
> -	if (!rproc)
> -		return dev_err_probe(dev, -ENOMEM, "unable to allocate remoteproc\n");
> +	if (!rproc) {
> +		dev_err(dev, "unable to allocate remoteproc\n");
> +		return ERR_PTR(-ENOMEM);

Why are you converting those dev_err_probe to dev_err->return?!

Regards,
Angelo