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Message-ID: <ZOzgja8mfNefRqP7@p14s>
Date: Mon, 28 Aug 2023 11:59:41 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Tinghan Shen <tinghan.shen@...iatek.com>
Cc: Bjorn Andersson <andersson@...nel.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>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
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 v16 08/14] remoteproc: mediatek: Probe SCP cluster on
multi-core SCP
Hi Tinghan,
On Fri, Jul 28, 2023 at 10:39:53AM +0800, Tinghan Shen wrote:
> The difference of single-core SCP and multi-core SCP device tree is
> the presence of child device nodes described SCP cores. The SCP
> driver populates the platform device and checks the child nodes
> to identify whether it's a single-core SCP or a multi-core SCP.
>
> Add the remoteproc instances of multi-core SCP to the SCP cluster list.
> When the SCP driver is removed, it cleanup resources by walking
> through the cluster list.
>
> Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> ---
> drivers/remoteproc/mtk_scp.c | 118 +++++++++++++++++++++++++++++++++--
> 1 file changed, 113 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index d67dcabdab9e..d9242c3eb0d7 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -855,7 +855,8 @@ static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
> }
>
> static struct mtk_scp *scp_rproc_init(struct platform_device *pdev,
> - struct mtk_scp_of_cluster *scp_cluster)
> + struct mtk_scp_of_cluster *scp_cluster,
> + const struct mtk_scp_of_data *of_data)
> {
> struct device *dev = &pdev->dev;
> struct device_node *np = dev->of_node;
> @@ -878,7 +879,7 @@ static struct mtk_scp *scp_rproc_init(struct platform_device *pdev,
> scp = rproc->priv;
> scp->rproc = rproc;
> scp->dev = dev;
> - scp->data = of_device_get_match_data(dev);
> + scp->data = of_data;
> scp->cluster = scp_cluster;
> platform_set_drvdata(pdev, scp);
>
> @@ -951,15 +952,15 @@ static void scp_free(struct mtk_scp *scp)
> mutex_destroy(&scp->send_lock);
> }
>
> -static int scp_cluster_init(struct platform_device *pdev,
> - struct mtk_scp_of_cluster *scp_cluster)
> +static int scp_add_single_core(struct platform_device *pdev,
> + struct mtk_scp_of_cluster *scp_cluster)
> {
> struct device *dev = &pdev->dev;
> struct list_head *scp_list = &scp_cluster->mtk_scp_list;
> struct mtk_scp *scp;
> int ret;
>
> - scp = scp_rproc_init(pdev, scp_cluster);
> + scp = scp_rproc_init(pdev, scp_cluster, of_device_get_match_data(dev));
> if (IS_ERR(scp))
> return PTR_ERR(scp);
>
> @@ -975,6 +976,102 @@ static int scp_cluster_init(struct platform_device *pdev,
> return 0;
> }
>
> +static int scp_add_multi_core(struct platform_device *pdev,
> + struct mtk_scp_of_cluster *scp_cluster)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev_of_node(dev);
> + struct platform_device *cpdev;
> + struct device_node *child;
> + struct list_head *scp_list = &scp_cluster->mtk_scp_list;
> + const struct mtk_scp_of_data **cluster_of_data;
> + struct mtk_scp *scp, *temp;
> + int core_id = 0;
> + int ret;
> +
> + cluster_of_data = (const struct mtk_scp_of_data **)of_device_get_match_data(dev);
> +
> + for_each_available_child_of_node(np, child) {
> + if (!cluster_of_data[core_id]) {
> + ret = -EINVAL;
> + dev_err(dev, "Not support core %d\n", core_id);
> + of_node_put(child);
> + goto init_fail;
> + }
> +
> + cpdev = of_find_device_by_node(child);
> + if (!cpdev) {
> + ret = -ENODEV;
> + dev_err(dev, "Not found platform device for core %d\n", core_id);
> + of_node_put(child);
> + goto init_fail;
> + }
> +
> + scp = scp_rproc_init(cpdev, scp_cluster, cluster_of_data[core_id]);
> + put_device(&cpdev->dev);
> + if (IS_ERR(scp)) {
> + ret = PTR_ERR(scp);
> + dev_err(dev, "Failed to initialize core %d rproc\n", core_id);
> + of_node_put(child);
> + goto init_fail;
> + }
> +
> + ret = rproc_add(scp->rproc);
> + if (ret) {
> + dev_err(dev, "Failed to add rproc of core %d\n", core_id);
> + of_node_put(child);
> + scp_free(scp);
> + goto init_fail;
> + }
> +
> + list_add_tail(&scp->elem, scp_list);
> + core_id++;
> + }
> +
> + platform_set_drvdata(pdev, scp);
> +
Here we are setting the platform device for @pdev to the last @scp that was
created, which is needed because (1) scp_rproc_init() is calling
platform_set_drvdata() on the child platform devices and (2) we need a handle to
the cluster list in scp_remove().
Please add a comment with the above just before calling platform_set_drvdata().
Otherwise it will be very difficult for people not familiar with the driver to
understand what is going on.
Otherwise I think we are done.
Thanks,
Mathieu
> + return 0;
> +
> +init_fail:
> + list_for_each_entry_safe_reverse(scp, temp, scp_list, elem) {
> + list_del(&scp->elem);
> + rproc_del(scp->rproc);
> + scp_free(scp);
> + }
> +
> + return ret;
> +}
> +
> +static int scp_is_single_core(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct device_node *np = dev_of_node(dev);
> + struct device_node *child;
> +
> + child = of_get_next_available_child(np, NULL);
> + if (!child)
> + return dev_err_probe(dev, -ENODEV, "No child node\n");
> +
> + of_node_put(child);
> + return of_node_name_eq(child, "cros-ec-rpmsg");
> +}
> +
> +static int scp_cluster_init(struct platform_device *pdev, struct mtk_scp_of_cluster *scp_cluster)
> +{
> + int ret;
> +
> + ret = scp_is_single_core(pdev);
> + if (ret < 0)
> + return ret;
> +
> + if (ret)
> + ret = scp_add_single_core(pdev, scp_cluster);
> + else
> + ret = scp_add_multi_core(pdev, scp_cluster);
> +
> + return ret;
> +}
> +
> static int scp_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -1007,6 +1104,10 @@ static int scp_probe(struct platform_device *pdev)
>
> INIT_LIST_HEAD(&scp_cluster->mtk_scp_list);
>
> + ret = devm_of_platform_populate(dev);
> + if (ret)
> + return dev_err_probe(dev, ret, "Failed to populate platform devices\n");
> +
> ret = scp_cluster_init(pdev, scp_cluster);
> if (ret)
> return ret;
> @@ -1101,12 +1202,19 @@ static const struct mtk_scp_of_data mt8195_of_data_c1 = {
> .host_to_scp_int_bit = MT8195_CORE1_HOST_IPC_INT_BIT,
> };
>
> +static const struct mtk_scp_of_data *mt8195_of_data_cores[] = {
> + &mt8195_of_data,
> + &mt8195_of_data_c1,
> + NULL
> +};
> +
> static const struct of_device_id mtk_scp_of_match[] = {
> { .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data },
> { .compatible = "mediatek,mt8186-scp", .data = &mt8186_of_data },
> { .compatible = "mediatek,mt8188-scp", .data = &mt8188_of_data },
> { .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data },
> { .compatible = "mediatek,mt8195-scp", .data = &mt8195_of_data },
> + { .compatible = "mediatek,mt8195-scp-dual", .data = &mt8195_of_data_cores },
> {},
> };
> MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
> --
> 2.18.0
>
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