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Message-ID: <7c7acbf5-a6d5-4fe6-92ca-c5b3be2e85af@arm.com>
Date: Mon, 4 Dec 2023 12:18:33 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
linux-arm-kernel@...ts.infradead.org
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
Sudeep Holla <sudeep.holla@....com>,
Mike Leach <mike.leach@...aro.org>,
James Clark <james.clark@....com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
coresight@...ts.linaro.org,
linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH V2 3/7] coresight: catu: Move ACPI support from AMBA
driver to platform driver
On 12/1/23 19:11, Suzuki K Poulose wrote:
> 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.
Makes sense.
>
>>
>> Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
>> Cc: Sudeep Holla <sudeep.holla@....com>
>> Cc: Suzuki K Poulose <suzuki.poulose@....com>
>> Cc: Mike Leach <mike.leach@...aro.org>
>> Cc: James Clark <james.clark@....com>
>> Cc: linux-acpi@...r.kernel.org
>> Cc: linux-arm-kernel@...ts.infradead.org
>> Cc: linux-kernel@...r.kernel.org
>> Cc: coresight@...ts.linaro.org
>> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
>> ---
>> 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 <suzuki.poulose@....com>
>> */
>> +#include <linux/platform_device.h>
>> +#include <linux/acpi.h>
>> #include <linux/amba/bus.h>
>> #include <linux/device.h>
>> #include <linux/dma-mapping.h>
>> @@ -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.
Actually, the first check here should be for valid drvdata instead,
ensuring that subsequent de-referencing for drvdata->pclk does not
crash. Will do this replacement for all affected patches.
>
>> + 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 ?
Sure, will split the helpers addition along with their header changes
into a separate patch at the beginning of this series, and then use
them for funnel and replicator devices in subsequent patches.
>
>
>> +
>> MODULE_LICENSE("GPL v2");
>> MODULE_AUTHOR("Pratik Patel <pratikp@...eaurora.org>");
>> MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@...aro.org>");
>> 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 <linux/io.h>
>> #include <linux/perf_event.h>
>> #include <linux/sched.h>
>> +#include <linux/amba/bus.h>
>> +#include <linux/platform_device.h>
>> /* 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
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