This series enables detection of ACPI based TRBE devices via a stand alone purpose built representative platform device. But as a pre-requisite this changes coresight_platform_data structure assignment for the TRBE device.
Anshuman Khandual (2): coresight: trbe: Add a representative coresight_platform_data for TRBE coresight: trbe: Enable ACPI based TRBE devices
drivers/hwtracing/coresight/coresight-trbe.c | 23 ++++++++++++++++++-- drivers/hwtracing/coresight/coresight-trbe.h | 2 ++ 2 files changed, 23 insertions(+), 2 deletions(-)
From: Anshuman Khandual anshuman.khandual@arm.com
mainline inclusion from mainline-v6.8-rc1 commit 4277f035d227e829133df284be7e35b7236a5b0f category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8BOB3 CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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TRBE coresight devices do not need regular connections information, as the paths get built between all percpu source and their respective percpu sink devices. Please refer 'commit 2cd87a7b293d ("coresight: core: Add support for dedicated percpu sinks")' which added support for percpu sink devices.
coresight_register() expect device connections via the platform_data. TRBE devices do not have any graph connections and thus is empty. With upcoming ACPI support for TRBE, we do not get a real acpi_device and thus coresight_get_platform_dat() will end up in failures. Hence this allocates a zeroed coresight_platform_data structure and assigns that back into the device.
Cc: Suzuki K Poulose suzuki.poulose@arm.com Cc: Mike Leach mike.leach@linaro.org Cc: Leo Yan leo.yan@linaro.org Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual anshuman.khandual@arm.com Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com Link: https://lore.kernel.org/r/20230829135405.1159449-2-anshuman.khandual@arm.com Signed-off-by: Junhao He hejunhao3@huawei.com --- drivers/hwtracing/coresight/coresight-trbe.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c index e20c1c6acc73..97b9e72965e6 100644 --- a/drivers/hwtracing/coresight/coresight-trbe.c +++ b/drivers/hwtracing/coresight/coresight-trbe.c @@ -1253,8 +1253,18 @@ static void arm_trbe_register_coresight_cpu(struct trbe_drvdata *drvdata, int cp desc.name = devm_kasprintf(dev, GFP_KERNEL, "trbe%d", cpu); if (!desc.name) goto cpu_clear; - - desc.pdata = coresight_get_platform_data(dev); + /* + * TRBE coresight devices do not need regular connections + * information, as the paths get built between all percpu + * source and their respective percpu sink devices. Though + * coresight_register() expect device connections via the + * platform_data, which TRBE devices do not have. As they + * are not real ACPI devices, coresight_get_platform_data() + * ends up failing. Instead let's allocate a dummy zeroed + * coresight_platform_data structure and assign that back + * into the device for that purpose. + */ + desc.pdata = devm_kzalloc(dev, sizeof(*desc.pdata), GFP_KERNEL); if (IS_ERR(desc.pdata)) goto cpu_clear;
From: Anshuman Khandual anshuman.khandual@arm.com
mainline inclusion from mainline-v6.8-rc1 commit 17f8b216e02654a0b37127736ce78b32ccaa867b category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8BOB3 CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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This detects and enables ACPI based TRBE devices via the dummy platform device created earlier for this purpose.
Cc: Suzuki K Poulose suzuki.poulose@arm.com Cc: Mike Leach mike.leach@linaro.org Cc: Leo Yan leo.yan@linaro.org Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: coresight@lists.linaro.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Anshuman Khandual anshuman.khandual@arm.com Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com Link: https://lore.kernel.org/r/20230829135405.1159449-3-anshuman.khandual@arm.com Signed-off-by: Junhao He hejunhao3@huawei.com --- drivers/hwtracing/coresight/coresight-trbe.c | 9 +++++++++ drivers/hwtracing/coresight/coresight-trbe.h | 2 ++ 2 files changed, 11 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c index 97b9e72965e6..a3954be7b1f3 100644 --- a/drivers/hwtracing/coresight/coresight-trbe.c +++ b/drivers/hwtracing/coresight/coresight-trbe.c @@ -1546,7 +1546,16 @@ static const struct of_device_id arm_trbe_of_match[] = { }; MODULE_DEVICE_TABLE(of, arm_trbe_of_match);
+#ifdef CONFIG_ACPI +static const struct platform_device_id arm_trbe_acpi_match[] = { + { ARMV8_TRBE_PDEV_NAME, 0 }, + { } +}; +MODULE_DEVICE_TABLE(platform, arm_trbe_acpi_match); +#endif + static struct platform_driver arm_trbe_driver = { + .id_table = ACPI_PTR(arm_trbe_acpi_match), .driver = { .name = DRVNAME, .of_match_table = of_match_ptr(arm_trbe_of_match), diff --git a/drivers/hwtracing/coresight/coresight-trbe.h b/drivers/hwtracing/coresight/coresight-trbe.h index e915e749be55..45202c48acce 100644 --- a/drivers/hwtracing/coresight/coresight-trbe.h +++ b/drivers/hwtracing/coresight/coresight-trbe.h @@ -7,11 +7,13 @@ * * Author: Anshuman Khandual anshuman.khandual@arm.com */ +#include <linux/acpi.h> #include <linux/coresight.h> #include <linux/device.h> #include <linux/irq.h> #include <linux/kernel.h> #include <linux/of.h> +#include <linux/perf/arm_pmu.h> #include <linux/platform_device.h> #include <linux/smp.h>
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