From: Suzuki K Poulose <suzuki.poulose@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: coresight@lists.linaro.org, mathieu.poirier@linaro.org, anshuman.khandual@arm.com, mike.leach@linaro.org, leo.yan@linaro.org, linux-kernel@vger.kernel.org, jonathan.zhouwen@huawei.com, catalin.marinas@arm.com, Suzuki K Poulose <suzuki.poulose@arm.com> Subject: [PATCH v7 25/28] coresight: etm4x: Add support for sysreg only devices Date: Sun, 10 Jan 2021 22:48:47 +0000 [thread overview] Message-ID: <20210110224850.1880240-26-suzuki.poulose@arm.com> (raw) In-Reply-To: <20210110224850.1880240-1-suzuki.poulose@arm.com> Add support for devices with system instruction access only. They don't have a memory mapped interface and thus are not AMBA devices. System register access is not permitted to TRCPDCR and thus skip access to them. Cc: Mike Leach <mike.leach@linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- Changes since v5: - Rebased to accommodate check_arch_features(). Added comments to explain why we don't pass PID for system register based devices. Changes since v4 - Add "remove" callback for platform_driver. - Dropped Reviewed-by tag from Mathieu due to the above Changes since v3 - Improve comment over "TRCPDCR" usage with sysreg - Rename etm_xx => etm4_xx - Update the compatible to "arm,coresight-etm4x-sysreg" --- .../coresight/coresight-etm4x-core.c | 68 +++++++++++++++++-- 1 file changed, 63 insertions(+), 5 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 63a5e11b5f3f..3d3165dd09d4 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -27,6 +27,7 @@ #include <linux/seq_file.h> #include <linux/uaccess.h> #include <linux/perf_event.h> +#include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/property.h> @@ -1736,9 +1737,6 @@ static int etm4_probe(struct device *dev, void __iomem *base, u32 etm_pid) return -ENOMEM; } - if (fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up")) - drvdata->skip_power_up = true; - drvdata->base = base; spin_lock_init(&drvdata->spinlock); @@ -1762,6 +1760,11 @@ static int etm4_probe(struct device *dev, void __iomem *base, u32 etm_pid) if (!drvdata->arch) return -EINVAL; + /* TRCPDCR is not accessible with system instructions. */ + if (!desc.access.io_mem || + fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up")) + drvdata->skip_power_up = true; + etm4_init_trace_id(drvdata); etm4_set_default(&drvdata->config); @@ -1820,6 +1823,25 @@ static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id) return ret; } +static int etm4_probe_platform_dev(struct platform_device *pdev) +{ + int ret; + + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + /* + * System register based devices could match the + * HW by reading appropriate registers on the HW + * and thus we could skip the PID. + */ + ret = etm4_probe(&pdev->dev, NULL, 0); + + pm_runtime_put(&pdev->dev); + return ret; +} + static struct amba_cs_uci_id uci_id_etm4[] = { { /* ETMv4 UCI data */ @@ -1869,6 +1891,17 @@ static int __exit etm4_remove_amba(struct amba_device *adev) return 0; } +static int __exit etm4_remove_platform_dev(struct platform_device *pdev) +{ + int ret = 0; + struct etmv4_drvdata *drvdata = dev_get_drvdata(&pdev->dev); + + if (drvdata) + ret = etm4_remove_dev(drvdata); + pm_runtime_disable(&pdev->dev); + return ret; +} + static const struct amba_id etm4_ids[] = { CS_AMBA_ID(0x000bb95d), /* Cortex-A53 */ CS_AMBA_ID(0x000bb95e), /* Cortex-A57 */ @@ -1901,6 +1934,21 @@ static struct amba_driver etm4x_amba_driver = { .id_table = etm4_ids, }; +static const struct of_device_id etm4_sysreg_match[] = { + { .compatible = "arm,coresight-etm4x-sysreg" }, + {} +}; + +static struct platform_driver etm4_platform_driver = { + .probe = etm4_probe_platform_dev, + .remove = etm4_remove_platform_dev, + .driver = { + .name = "coresight-etm4x", + .of_match_table = etm4_sysreg_match, + .suppress_bind_attrs = true, + }, +}; + static int __init etm4x_init(void) { int ret; @@ -1913,16 +1961,26 @@ static int __init etm4x_init(void) ret = amba_driver_register(&etm4x_amba_driver); if (ret) { - pr_err("Error registering etm4x driver\n"); - etm4_pm_clear(); + pr_err("Error registering etm4x AMBA driver\n"); + goto clear_pm; } + ret = platform_driver_register(&etm4_platform_driver); + if (!ret) + return 0; + + pr_err("Error registering etm4x platform driver\n"); + amba_driver_unregister(&etm4x_amba_driver); + +clear_pm: + etm4_pm_clear(); return ret; } static void __exit etm4x_exit(void) { amba_driver_unregister(&etm4x_amba_driver); + platform_driver_unregister(&etm4_platform_driver); etm4_pm_clear(); } -- 2.24.1
WARNING: multiple messages have this Message-ID (diff)
From: Suzuki K Poulose <suzuki.poulose@arm.com> To: linux-arm-kernel@lists.infradead.org Cc: mathieu.poirier@linaro.org, anshuman.khandual@arm.com, catalin.marinas@arm.com, coresight@lists.linaro.org, Suzuki K Poulose <suzuki.poulose@arm.com>, linux-kernel@vger.kernel.org, leo.yan@linaro.org, jonathan.zhouwen@huawei.com, mike.leach@linaro.org Subject: [PATCH v7 25/28] coresight: etm4x: Add support for sysreg only devices Date: Sun, 10 Jan 2021 22:48:47 +0000 [thread overview] Message-ID: <20210110224850.1880240-26-suzuki.poulose@arm.com> (raw) In-Reply-To: <20210110224850.1880240-1-suzuki.poulose@arm.com> Add support for devices with system instruction access only. They don't have a memory mapped interface and thus are not AMBA devices. System register access is not permitted to TRCPDCR and thus skip access to them. Cc: Mike Leach <mike.leach@linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- Changes since v5: - Rebased to accommodate check_arch_features(). Added comments to explain why we don't pass PID for system register based devices. Changes since v4 - Add "remove" callback for platform_driver. - Dropped Reviewed-by tag from Mathieu due to the above Changes since v3 - Improve comment over "TRCPDCR" usage with sysreg - Rename etm_xx => etm4_xx - Update the compatible to "arm,coresight-etm4x-sysreg" --- .../coresight/coresight-etm4x-core.c | 68 +++++++++++++++++-- 1 file changed, 63 insertions(+), 5 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 63a5e11b5f3f..3d3165dd09d4 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -27,6 +27,7 @@ #include <linux/seq_file.h> #include <linux/uaccess.h> #include <linux/perf_event.h> +#include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/property.h> @@ -1736,9 +1737,6 @@ static int etm4_probe(struct device *dev, void __iomem *base, u32 etm_pid) return -ENOMEM; } - if (fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up")) - drvdata->skip_power_up = true; - drvdata->base = base; spin_lock_init(&drvdata->spinlock); @@ -1762,6 +1760,11 @@ static int etm4_probe(struct device *dev, void __iomem *base, u32 etm_pid) if (!drvdata->arch) return -EINVAL; + /* TRCPDCR is not accessible with system instructions. */ + if (!desc.access.io_mem || + fwnode_property_present(dev_fwnode(dev), "qcom,skip-power-up")) + drvdata->skip_power_up = true; + etm4_init_trace_id(drvdata); etm4_set_default(&drvdata->config); @@ -1820,6 +1823,25 @@ static int etm4_probe_amba(struct amba_device *adev, const struct amba_id *id) return ret; } +static int etm4_probe_platform_dev(struct platform_device *pdev) +{ + int ret; + + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + /* + * System register based devices could match the + * HW by reading appropriate registers on the HW + * and thus we could skip the PID. + */ + ret = etm4_probe(&pdev->dev, NULL, 0); + + pm_runtime_put(&pdev->dev); + return ret; +} + static struct amba_cs_uci_id uci_id_etm4[] = { { /* ETMv4 UCI data */ @@ -1869,6 +1891,17 @@ static int __exit etm4_remove_amba(struct amba_device *adev) return 0; } +static int __exit etm4_remove_platform_dev(struct platform_device *pdev) +{ + int ret = 0; + struct etmv4_drvdata *drvdata = dev_get_drvdata(&pdev->dev); + + if (drvdata) + ret = etm4_remove_dev(drvdata); + pm_runtime_disable(&pdev->dev); + return ret; +} + static const struct amba_id etm4_ids[] = { CS_AMBA_ID(0x000bb95d), /* Cortex-A53 */ CS_AMBA_ID(0x000bb95e), /* Cortex-A57 */ @@ -1901,6 +1934,21 @@ static struct amba_driver etm4x_amba_driver = { .id_table = etm4_ids, }; +static const struct of_device_id etm4_sysreg_match[] = { + { .compatible = "arm,coresight-etm4x-sysreg" }, + {} +}; + +static struct platform_driver etm4_platform_driver = { + .probe = etm4_probe_platform_dev, + .remove = etm4_remove_platform_dev, + .driver = { + .name = "coresight-etm4x", + .of_match_table = etm4_sysreg_match, + .suppress_bind_attrs = true, + }, +}; + static int __init etm4x_init(void) { int ret; @@ -1913,16 +1961,26 @@ static int __init etm4x_init(void) ret = amba_driver_register(&etm4x_amba_driver); if (ret) { - pr_err("Error registering etm4x driver\n"); - etm4_pm_clear(); + pr_err("Error registering etm4x AMBA driver\n"); + goto clear_pm; } + ret = platform_driver_register(&etm4_platform_driver); + if (!ret) + return 0; + + pr_err("Error registering etm4x platform driver\n"); + amba_driver_unregister(&etm4x_amba_driver); + +clear_pm: + etm4_pm_clear(); return ret; } static void __exit etm4x_exit(void) { amba_driver_unregister(&etm4x_amba_driver); + platform_driver_unregister(&etm4_platform_driver); etm4_pm_clear(); } -- 2.24.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-01-10 22:51 UTC|newest] Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-10 22:48 [PATCH v7 00/28] coresight: etm4x: Support for system instructions Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 01/28] coresight: etm4x: Handle access to TRCSSPCICRn Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 02/28] coresight: etm4x: Skip accessing TRCPDCR in save/restore Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-25 18:39 ` Mathieu Poirier 2021-01-25 18:39 ` Mathieu Poirier 2021-01-10 22:48 ` [PATCH v7 03/28] coresight: Introduce device access abstraction Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-25 18:42 ` Mathieu Poirier 2021-01-25 18:42 ` Mathieu Poirier 2021-01-10 22:48 ` [PATCH v7 04/28] coresight: tpiu: Prepare for using coresight " Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 05/28] coresight: Convert coresight_timeout to use " Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 06/28] coresight: Convert claim/disclaim operations to use access wrappers Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 07/28] coresight: etm4x: Always read the registers on the host CPU Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 08/28] coresight: etm4x: Convert all register accesses Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 09/28] coresight: etm4x: Make offset available for sysfs attributes Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 10/28] coresight: etm4x: Add commentary on the registers Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 11/28] coresight: etm4x: Add sysreg access helpers Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 12/28] coresight: etm4x: Hide sysfs attributes for unavailable registers Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 13/28] coresight: etm4x: Define DEVARCH register fields Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 14/28] coresight: etm4x: Check for Software Lock Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 15/28] coresight: etm4x: Cleanup secure exception level masks Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 16/28] coresight: etm4x: Clean up " Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 17/28] coresight: etm4x: Handle ETM architecture version Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 18/28] coresight: etm4x: Detect access early on the target CPU Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 19/28] coresight: etm4x: Use TRCDEVARCH for component discovery Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 20/28] coresight: etm4x: Expose trcdevarch via sysfs Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 21/28] coresight: etm4x: Add necessary synchronization for sysreg access Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 22/28] coresight: etm4x: Detect system instructions support Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 23/28] coresight: etm4x: Refactor probing routine Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 24/28] coresight: etm4x: Run arch feature detection on the CPU Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose [this message] 2021-01-10 22:48 ` [PATCH v7 25/28] coresight: etm4x: Add support for sysreg only devices Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 26/28] dts: bindings: coresight: ETM system register access only units Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 27/28] arm64: Add TRFCR_ELx definitions Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-01-10 22:48 ` [PATCH v7 28/28] coresight: Add support for v8.4 SelfHosted tracing Suzuki K Poulose 2021-01-10 22:48 ` Suzuki K Poulose 2021-02-12 10:34 ` Mike Leach 2021-02-12 10:34 ` Mike Leach 2021-02-12 15:36 ` Suzuki K Poulose 2021-02-12 15:36 ` Suzuki K Poulose 2021-02-12 17:30 ` Mike Leach 2021-02-12 17:30 ` Mike Leach 2021-02-18 14:51 ` Suzuki K Poulose 2021-02-18 14:51 ` Suzuki K Poulose 2021-01-25 18:49 ` [PATCH v7 00/28] coresight: etm4x: Support for system instructions Mathieu Poirier 2021-01-25 18:49 ` Mathieu Poirier 2021-01-25 22:05 ` Suzuki K Poulose 2021-01-25 22:05 ` Suzuki K Poulose
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