From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: catalin.marinas@arm.com, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, leo.yan@linaro.org,
jonathan.zhouwen@huawei.com, mike.leach@linaro.org
Subject: Re: [PATCH v5 21/25] coresight: etm4x: Refactor probing routine
Date: Tue, 5 Jan 2021 14:44:10 -0700 [thread overview]
Message-ID: <20210105214410.GA2789330@xps15> (raw)
In-Reply-To: <20201214173731.302520-22-suzuki.poulose@arm.com>
Hi Suzuki,
On Mon, Dec 14, 2020 at 05:37:27PM +0000, Suzuki K Poulose wrote:
> CoreSight ETM with system register access may not have a
> memory mapped i/o access. Refactor the ETM specific probing
> into a common routine to allow reusing the code for such ETMs.
>
> Cc: Mike Leach <mike.leach@linaro.org>
> Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
> ---
> Changes since v4:
> - Refactor the "remove" callback for AMBA driver, for reuse by
> platform_driver to follow
> - Removed Reviewed-by from Mathieu, due to the above
> ---
> .../coresight/coresight-etm4x-core.c | 60 ++++++++++++-------
> 1 file changed, 38 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index 25eb42c95527..89bb5a424a2b 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -1610,14 +1610,11 @@ static void etm4_pm_clear(void)
> }
> }
>
> -static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> +static int etm4_probe(struct device *dev, void __iomem *base)
Please rebase this set to the latest coresight-next (new location on
git.kernel.org). There is about half a dozen patches that don't apply anymore,
including this one where remove @id results in a compilation error due to Liu's
changes.
Thanks,
Mathieu
> {
> int ret;
> - void __iomem *base;
> - struct device *dev = &adev->dev;
> struct coresight_platform_data *pdata = NULL;
> struct etmv4_drvdata *drvdata;
> - struct resource *res = &adev->res;
> struct coresight_desc desc = { 0 };
> struct etm4_init_arg init_arg = { 0 };
>
> @@ -1641,11 +1638,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> if (fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up"))
> drvdata->skip_power_up = true;
>
> - /* Validity for the resource is already checked by the AMBA core */
> - base = devm_ioremap_resource(dev, res);
> - if (IS_ERR(base))
> - return PTR_ERR(base);
> -
> drvdata->base = base;
>
> spin_lock_init(&drvdata->spinlock);
> @@ -1675,7 +1667,7 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> if (IS_ERR(pdata))
> return PTR_ERR(pdata);
>
> - adev->dev.platform_data = pdata;
> + dev->platform_data = pdata;
>
> desc.type = CORESIGHT_DEV_TYPE_SOURCE;
> desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_PROC;
> @@ -1695,7 +1687,6 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
>
> etmdrvdata[drvdata->cpu] = drvdata;
>
> - pm_runtime_put(&adev->dev);
> dev_info(&drvdata->csdev->dev, "CPU%d: ETM v%d.%d initialized\n",
> drvdata->cpu, ETM_ARCH_MAJOR_VERSION(drvdata->arch),
> ETM_ARCH_MINOR_VERSION(drvdata->arch));
> @@ -1708,6 +1699,25 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
> return 0;
> }
>
> +static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id)
> +{
> + void __iomem *base;
> + struct device *dev = &adev->dev;
> + struct resource *res = &adev->res;
> + int ret;
> +
> + /* Validity for the resource is already checked by the AMBA core */
> + base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + ret = etm4_probe(dev, base);
> + if (!ret)
> + pm_runtime_put(&adev->dev);
> +
> + return ret;
> +}
> +
> static struct amba_cs_uci_id uci_id_etm4[] = {
> {
> /* ETMv4 UCI data */
> @@ -1724,15 +1734,12 @@ static void clear_etmdrvdata(void *info)
> etmdrvdata[cpu] = NULL;
> }
>
> -static int etm4_remove(struct amba_device *adev)
> +static int __exit etm4_remove_dev(struct etmv4_drvdata *drvdata)
> {
> - struct etmv4_drvdata *drvdata = dev_get_drvdata(&adev->dev);
> -
> etm_perf_symlink(drvdata->csdev, false);
> -
> /*
> - * Taking hotplug lock here to avoid racing between etm4_remove and
> - * CPU hotplug call backs.
> + * Taking hotplug lock here to avoid racing between etm4_remove_dev()
> + * and CPU hotplug call backs.
> */
> cpus_read_lock();
> /*
> @@ -1751,6 +1758,15 @@ static int etm4_remove(struct amba_device *adev)
> return 0;
> }
>
> +static int __exit etm4_remove_amba(struct amba_device *adev)
> +{
> + struct etmv4_drvdata *drvdata = dev_get_drvdata(&adev->dev);
> +
> + if (drvdata)
> + return etm4_remove_dev(drvdata);
> + return 0;
> +}
> +
> static const struct amba_id etm4_ids[] = {
> CS_AMBA_ID(0x000bb95d), /* Cortex-A53 */
> CS_AMBA_ID(0x000bb95e), /* Cortex-A57 */
> @@ -1772,14 +1788,14 @@ static const struct amba_id etm4_ids[] = {
>
> MODULE_DEVICE_TABLE(amba, etm4_ids);
>
> -static struct amba_driver etm4x_driver = {
> +static struct amba_driver etm4x_amba_driver = {
> .drv = {
> .name = "coresight-etm4x",
> .owner = THIS_MODULE,
> .suppress_bind_attrs = true,
> },
> - .probe = etm4_probe,
> - .remove = etm4_remove,
> + .probe = etm4_probe_amba,
> + .remove = etm4_remove_amba,
> .id_table = etm4_ids,
> };
>
> @@ -1793,7 +1809,7 @@ static int __init etm4x_init(void)
> if (ret)
> return ret;
>
> - ret = amba_driver_register(&etm4x_driver);
> + ret = amba_driver_register(&etm4x_amba_driver);
> if (ret) {
> pr_err("Error registering etm4x driver\n");
> etm4_pm_clear();
> @@ -1804,7 +1820,7 @@ static int __init etm4x_init(void)
>
> static void __exit etm4x_exit(void)
> {
> - amba_driver_unregister(&etm4x_driver);
> + amba_driver_unregister(&etm4x_amba_driver);
> etm4_pm_clear();
> }
>
> --
> 2.24.1
>
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next prev parent reply other threads:[~2021-01-05 21:46 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-14 17:37 [PATCH v5 00/25] coresight: etm4x: Support for system instructions Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 01/25] coresight: etm4x: Handle access to TRCSSPCICRn Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 02/25] coresight: etm4x: Skip accessing TRCPDCR in save/restore Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 03/25] coresight: Introduce device access abstraction Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 04/25] coresight: tpiu: Prepare for using coresight " Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 05/25] coresight: Convert coresight_timeout to use " Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 06/25] coresight: Convert claim/disclaim operations to use access wrappers Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 07/25] coresight: etm4x: Always read the registers on the host CPU Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 08/25] coresight: etm4x: Convert all register accesses Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 09/25] coresight: etm4x: Add commentary on the registers Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 10/25] coresight: etm4x: Add sysreg access helpers Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 11/25] coresight: etm4x: Define DEVARCH register fields Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 12/25] coresight: etm4x: Check for Software Lock Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 13/25] coresight: etm4x: Cleanup secure exception level masks Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 14/25] coresight: etm4x: Clean up " Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 15/25] coresight: etm4x: Handle ETM architecture version Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 16/25] coresight: etm4x: Detect access early on the target CPU Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 17/25] coresight: etm4x: Use TRCDEVARCH for component discovery Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 18/25] coresight: etm4x: Expose trcdevarch via trcidr Suzuki K Poulose
2020-12-16 18:01 ` Mike Leach
2020-12-14 17:37 ` [PATCH v5 19/25] coresight: etm4x: Add necessary synchronization for sysreg access Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 20/25] coresight: etm4x: Detect system instructions support Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 21/25] coresight: etm4x: Refactor probing routine Suzuki K Poulose
2021-01-05 21:44 ` Mathieu Poirier [this message]
2020-12-14 17:37 ` [PATCH v5 22/25] coresight: etm4x: Add support for sysreg only devices Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 23/25] dts: bindings: coresight: ETM system register access only units Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 24/25] arm64: Add TRFCR_ELx definitions Suzuki K Poulose
2020-12-14 17:37 ` [PATCH v5 25/25] coresight: Add support for v8.4 SelfHosted tracing Suzuki K Poulose
2021-01-06 14:48 ` [PATCH v5 00/25] coresight: etm4x: Support for system instructions Mike Leach
2021-01-06 14:52 ` Suzuki K Poulose
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