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[2620:137:e000::3:1]) by mx.google.com with ESMTPS id f2-20020a654002000000b005b21d089aabsi3348656pgp.519.2023.12.01.05.41.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 01 Dec 2023 05:41:27 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:1 as permitted sender) client-ip=2620:137:e000::3:1; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:1 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=arm.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by morse.vger.email (Postfix) with ESMTP id 8A6D4836D635; Fri, 1 Dec 2023 05:41:24 -0800 (PST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.11 at morse.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379017AbjLANlI (ORCPT + 99 others); Fri, 1 Dec 2023 08:41:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39056 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379013AbjLANlH (ORCPT ); Fri, 1 Dec 2023 08:41:07 -0500 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 61B0A10E2; Fri, 1 Dec 2023 05:41:12 -0800 (PST) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2DA291007; Fri, 1 Dec 2023 05:41:58 -0800 (PST) Received: from [10.1.197.1] (ewhatever.cambridge.arm.com [10.1.197.1]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1AEC93F73F; Fri, 1 Dec 2023 05:41:09 -0800 (PST) Message-ID: <56e9bc16-7962-46c6-858d-53aa7a6c8555@arm.com> Date: Fri, 1 Dec 2023 13:41:08 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V2 3/7] coresight: catu: Move ACPI support from AMBA driver to platform driver Content-Language: en-US To: Anshuman Khandual , linux-arm-kernel@lists.infradead.org Cc: Lorenzo Pieralisi , Sudeep Holla , Mike Leach , James Clark , Maxime Coquelin , Alexandre Torgue , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-stm32@st-md-mailman.stormreply.com References: <20231201062053.1268492-1-anshuman.khandual@arm.com> <20231201062053.1268492-4-anshuman.khandual@arm.com> From: Suzuki K Poulose In-Reply-To: <20231201062053.1268492-4-anshuman.khandual@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-0.8 required=5.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on morse.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (morse.vger.email [0.0.0.0]); Fri, 01 Dec 2023 05:41:24 -0800 (PST) Hi Anshuman, On 01/12/2023 06:20, Anshuman Khandual wrote: > Add support for the catu devices in a new platform driver, which can then > be used on ACPI based platforms. This change would now allow runtime power > management for ACPI based systems. The driver would try to enable the APB > clock if available. This doesn't talk about the new helper. As such I would prefer that to be a separate preparatory patch. See below. > > Cc: Lorenzo Pieralisi > Cc: Sudeep Holla > Cc: Suzuki K Poulose > Cc: Mike Leach > Cc: James Clark > Cc: linux-acpi@vger.kernel.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Cc: coresight@lists.linaro.org > Signed-off-by: Anshuman Khandual > --- > drivers/acpi/arm64/amba.c | 1 - > drivers/hwtracing/coresight/coresight-catu.c | 130 ++++++++++++++++--- > drivers/hwtracing/coresight/coresight-catu.h | 1 + > drivers/hwtracing/coresight/coresight-core.c | 29 +++++ > include/linux/coresight.h | 7 + > 5 files changed, 149 insertions(+), 19 deletions(-) > > diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c > index afb6afb66967..587061b0fd2f 100644 > --- a/drivers/acpi/arm64/amba.c > +++ b/drivers/acpi/arm64/amba.c > @@ -27,7 +27,6 @@ static const struct acpi_device_id amba_id_list[] = { > {"ARMHC503", 0}, /* ARM CoreSight Debug */ > {"ARMHC979", 0}, /* ARM CoreSight TPIU */ > {"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */ > - {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ > {"", 0}, > }; > > diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c > index 3949ded0d4fa..ba5ee7d158dd 100644 > --- a/drivers/hwtracing/coresight/coresight-catu.c > +++ b/drivers/hwtracing/coresight/coresight-catu.c > @@ -7,6 +7,8 @@ > * Author: Suzuki K Poulose > */ > > +#include > +#include > #include > #include > #include > @@ -502,28 +504,20 @@ static const struct coresight_ops catu_ops = { > .helper_ops = &catu_helper_ops, > }; > > -static int catu_probe(struct amba_device *adev, const struct amba_id *id) > +static int __catu_probe(struct device *dev, struct resource *res) > { > int ret = 0; > u32 dma_mask; > - struct catu_drvdata *drvdata; > + struct catu_drvdata *drvdata = dev_get_drvdata(dev); > struct coresight_desc catu_desc; > struct coresight_platform_data *pdata = NULL; > - struct device *dev = &adev->dev; > void __iomem *base; > > catu_desc.name = coresight_alloc_device_name(&catu_devs, dev); > if (!catu_desc.name) > return -ENOMEM; > > - drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); > - if (!drvdata) { > - ret = -ENOMEM; > - goto out; > - } > - > - dev_set_drvdata(dev, drvdata); > - base = devm_ioremap_resource(dev, &adev->res); > + base = devm_ioremap_resource(dev, res); > if (IS_ERR(base)) { > ret = PTR_ERR(base); > goto out; > @@ -568,18 +562,35 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id) > if (IS_ERR(drvdata->csdev)) > ret = PTR_ERR(drvdata->csdev); > else > - pm_runtime_put(&adev->dev); > + pm_runtime_put(dev); > out: > return ret; > } > > -static void catu_remove(struct amba_device *adev) > +static int catu_probe(struct amba_device *adev, const struct amba_id *id) > +{ > + struct catu_drvdata *drvdata; > + > + drvdata = devm_kzalloc(&adev->dev, sizeof(*drvdata), GFP_KERNEL); > + if (!drvdata) > + return -ENOMEM; > + > + amba_set_drvdata(adev, drvdata); > + return __catu_probe(&adev->dev, &adev->res); > +} > + > +static void __catu_remove(struct device *dev) > { > - struct catu_drvdata *drvdata = dev_get_drvdata(&adev->dev); > + struct catu_drvdata *drvdata = dev_get_drvdata(dev); > > coresight_unregister(drvdata->csdev); > } > > +static void catu_remove(struct amba_device *adev) > +{ > + __catu_remove(&adev->dev); > +} > + > static struct amba_id catu_ids[] = { > CS_AMBA_ID(0x000bb9ee), > {}, > @@ -598,13 +609,96 @@ static struct amba_driver catu_driver = { > .id_table = catu_ids, > }; > > +static int catu_platform_probe(struct platform_device *pdev) > +{ > + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + struct catu_drvdata *drvdata; > + int ret = 0; > + > + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); > + if (!drvdata) > + return -ENOMEM; > + > + drvdata->pclk = coresight_get_enable_apb_pclk(&pdev->dev); > + if (IS_ERR(drvdata->pclk)) > + return -ENODEV; > + > + if (res) { > + drvdata->base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(drvdata->base)) { > + clk_put(drvdata->pclk); > + return PTR_ERR(drvdata->base); > + } > + } > + > + pm_runtime_get_noresume(&pdev->dev); > + pm_runtime_set_active(&pdev->dev); > + pm_runtime_enable(&pdev->dev); > + > + dev_set_drvdata(&pdev->dev, drvdata); > + ret = __catu_probe(&pdev->dev, res); > + if (ret) { > + pm_runtime_put_noidle(&pdev->dev); > + pm_runtime_disable(&pdev->dev); > + } > + return ret; > +} > + > +static int catu_platform_remove(struct platform_device *pdev) > +{ > + __catu_remove(&pdev->dev); > + return 0; > +} > + > +#ifdef CONFIG_PM > +static int catu_runtime_suspend(struct device *dev) > +{ > + struct catu_drvdata *drvdata = dev_get_drvdata(dev); > + > + if (drvdata->pclk && !IS_ERR_OR_NULL(drvdata->pclk)) Only the second part is needed. IS_ERR_OR_NULL() already checks for NULL. > + clk_disable_unprepare(drvdata->pclk); > + return 0; > +} > + > +static int catu_runtime_resume(struct device *dev) > +{ > + struct catu_drvdata *drvdata = dev_get_drvdata(dev); > + > + if (drvdata->pclk && !IS_ERR_OR_NULL(drvdata->pclk)) Same here. > + clk_prepare_enable(drvdata->pclk); > + return 0; > +} > +#endif > + > +static const struct dev_pm_ops catu_dev_pm_ops = { > + SET_RUNTIME_PM_OPS(catu_runtime_suspend, catu_runtime_resume, NULL) > +}; > + > +#ifdef CONFIG_ACPI > +static const struct acpi_device_id catu_acpi_ids[] = { > + {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ > + {}, > +}; > + > +MODULE_DEVICE_TABLE(acpi, catu_acpi_ids); > +#endif > + > +static struct platform_driver catu_platform_driver = { > + .probe = catu_platform_probe, > + .remove = catu_platform_remove, > + .driver = { > + .name = "coresight-catu-platform", > + .acpi_match_table = ACPI_PTR(catu_acpi_ids), > + .suppress_bind_attrs = true, > + .pm = &catu_dev_pm_ops, > + }, > +}; > + > static int __init catu_init(void) > { > int ret; > > - ret = amba_driver_register(&catu_driver); > - if (ret) > - pr_info("Error registering catu driver\n"); > + ret = coresight_init_driver("catu", &catu_driver, &catu_platform_driver); > tmc_etr_set_catu_ops(&etr_catu_buf_ops); > return ret; > } > @@ -612,7 +706,7 @@ static int __init catu_init(void) > static void __exit catu_exit(void) > { > tmc_etr_remove_catu_ops(); > - amba_driver_unregister(&catu_driver); > + coresight_remove_driver(&catu_driver, &catu_platform_driver); > } > > module_init(catu_init); > diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h > index 442e034bbfba..141feac1c14b 100644 > --- a/drivers/hwtracing/coresight/coresight-catu.h > +++ b/drivers/hwtracing/coresight/coresight-catu.h > @@ -61,6 +61,7 @@ > #define CATU_IRQEN_OFF 0x0 > > struct catu_drvdata { > + struct clk *pclk; > void __iomem *base; > struct coresight_device *csdev; > int irq; > diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c > index 9fabe00a40d6..ede9b0723f95 100644 > --- a/drivers/hwtracing/coresight/coresight-core.c > +++ b/drivers/hwtracing/coresight/coresight-core.c > @@ -1833,6 +1833,35 @@ static void __exit coresight_exit(void) > module_init(coresight_init); > module_exit(coresight_exit); > ---8>--- > +int coresight_init_driver(const char *drv, struct amba_driver *amba_drv, > + struct platform_driver *pdev_drv) > +{ > + int ret; > + > + ret = amba_driver_register(amba_drv); > + if (ret) { > + pr_err("%s: error registering AMBA driver\n", drv); > + return ret; > + } > + > + ret = platform_driver_register(pdev_drv); > + if (!ret) > + return 0; > + > + pr_err("%s: error registering platform driver\n", drv); > + amba_driver_unregister(amba_drv); > + return ret; > +} > +EXPORT_SYMBOL_GPL(coresight_init_driver); > + > +void coresight_remove_driver(struct amba_driver *amba_drv, > + struct platform_driver *pdev_drv) > +{ > + amba_driver_unregister(amba_drv); > + platform_driver_unregister(pdev_drv); > +} > +EXPORT_SYMBOL_GPL(coresight_remove_driver); Please could we split this into a separate patch itself ? Also, can we not use them for the other components ? funnel, replicator ? > + > MODULE_LICENSE("GPL v2"); > MODULE_AUTHOR("Pratik Patel "); > MODULE_AUTHOR("Mathieu Poirier "); > diff --git a/include/linux/coresight.h b/include/linux/coresight.h > index a269fffaf991..be7fe3793763 100644 > --- a/include/linux/coresight.h > +++ b/include/linux/coresight.h > @@ -12,6 +12,8 @@ > #include > #include > #include > +#include > +#include > > /* Peripheral id registers (0xFD0-0xFEC) */ > #define CORESIGHT_PERIPHIDR4 0xfd0 > @@ -597,6 +599,11 @@ void coresight_relaxed_write64(struct coresight_device *csdev, > u64 val, u32 offset); > void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset); > > +int coresight_init_driver(const char *drv, struct amba_driver *amba_drv, > + struct platform_driver *pdev_drv); > + > +void coresight_remove_driver(struct amba_driver *amba_drv, > + struct platform_driver *pdev_drv); > #else > static inline struct coresight_device * > coresight_register(struct coresight_desc *desc) { return NULL; } Suzuki