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Tue, 25 Jul 2023 12:59:47 -0700 (PDT) Date: Tue, 25 Jul 2023 13:59:44 -0600 From: Mathieu Poirier To: Tinghan Shen Cc: Bjorn Andersson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, Project_Global_Chrome_Upstream_Group@mediatek.com Subject: Re: [PATCH v15 07/13] remoteproc: mediatek: Probe SCP cluster on multi-core SCP Message-ID: References: <20230721024132.6548-1-tinghan.shen@mediatek.com> <20230721024132.6548-8-tinghan.shen@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230721024132.6548-8-tinghan.shen@mediatek.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230725_125951_669216_AA854363 X-CRM114-Status: GOOD ( 29.27 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Fri, Jul 21, 2023 at 10:41:26AM +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 > Reviewed-by: AngeloGioacchino Del Regno > --- > 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..34095a461e15 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, list_first_entry(scp_list, struct mtk_scp, elem)); (sigh) Why is list_first_entry() used here rather than just @scp? What is the purpose of using the list API? > + > + 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 >