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Message-ID: <c43fcd3a-9813-4e1f-adb3-25cc32c54438@arm.com>
Date: Tue, 5 Mar 2024 17:32:54 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Anshuman Khandual <anshuman.khandual@....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 V5 07/11] coresight: catu: Move ACPI support from AMBA
driver to platform driver
On 22/02/2024 08:21, 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. But first this renames and then refactors catu_probe()
> and catu_remove(), making sure it can be used both for platform and AMBA
> drivers. This also moves pm_runtime_put() from catu_probe() to the callers.
>
> 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
> Acked-by: Sudeep Holla <sudeep.holla@....com> # For ACPI related changes
> Reviewed-by: James Clark <james.clark@....com>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
> Changes in V5:
>
> - Updated commit message regarding catu_probe/remove() refactoring and renaming
>
> drivers/acpi/arm64/amba.c | 1 -
> drivers/hwtracing/coresight/coresight-catu.c | 142 ++++++++++++++++---
> drivers/hwtracing/coresight/coresight-catu.h | 1 +
> 3 files changed, 124 insertions(+), 20 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..a3ea46b53898 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;
> @@ -567,19 +561,39 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id)
> drvdata->csdev = coresight_register(&catu_desc);
> if (IS_ERR(drvdata->csdev))
> ret = PTR_ERR(drvdata->csdev);
> - else
> - pm_runtime_put(&adev->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 = dev_get_drvdata(&adev->dev);
> + struct catu_drvdata *drvdata;
> + int ret;
> +
> + drvdata = devm_kzalloc(&adev->dev, sizeof(*drvdata), GFP_KERNEL);
> + if (!drvdata)
> + return -ENOMEM;
> +
> + amba_set_drvdata(adev, drvdata);
> + ret = __catu_probe(&adev->dev, &adev->res);
> + if (!ret)
> + pm_runtime_put(&adev->dev);
> +
> + return ret;
> +}
> +
> +static void __catu_remove(struct device *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 +612,103 @@ 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;
---8>---
> +
> + if (res) {
> + drvdata->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(drvdata->base)) {
> + clk_put(drvdata->pclk);
> + return PTR_ERR(drvdata->base);
> + }
> + }
---<8---
The above section seems unncessary as we already try to map the base in
__catu_probe ?
> +
> + 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);
> + pm_runtime_put(&pdev->dev);
> + if (ret)
> + pm_runtime_disable(&pdev->dev);
> +
> + return ret;
> +}
> +
> +static int catu_platform_remove(struct platform_device *pdev)
> +{
> + struct catu_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
> +
> + if (drvdata)
> + __catu_remove(&pdev->dev);
I don't understand the need for if () check here (and on all the other
drivers). Even if we have a drvdata != NULL, what guarantees that
the drvdata->csdev is valid (which is used in xx_remove) ?
Suzuki
> +
> + pm_runtime_disable(&pdev->dev);
> + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
> + clk_put(drvdata->pclk);
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static int catu_runtime_suspend(struct device *dev)
> +{
> + struct catu_drvdata *drvdata = dev_get_drvdata(dev);
> +
> + if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
> + 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 && !IS_ERR_OR_NULL(drvdata->pclk))
> + 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 +716,7 @@ 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;
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