[PATCH v12 4/8] coresight: etr: add a new function to retrieve the CTCU device
From: Jie Gan <hidden>
Date: 2026-02-03 05:52:12
Also in:
linux-arm-msm, linux-devicetree, lkml
Subsystem:
arm/coresight framework and drivers, hardware tracing facilities, the rest · Maintainers:
Suzuki K Poulose, Alexander Shishkin, Linus Torvalds
Add tmc_etr_get_ctcu_device function to find the ptr of the coresight_device of the CTCU device if the CTCU device is connected to the TMC ETR device. Signed-off-by: Jie Gan <redacted> --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 24 ++++++++++++++++++++++++ drivers/hwtracing/coresight/coresight-tmc.h | 1 + 2 files changed, 25 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index cbbb15648fb7..2ece3985e2bc 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c@@ -867,6 +867,30 @@ tmc_etr_get_catu_device(struct tmc_drvdata *drvdata) } EXPORT_SYMBOL_GPL(tmc_etr_get_catu_device); +/* + * TMC ETR could be connected to a CTCU device, which can provide ATID filter + * and byte-cntr service. This is represented by the output port of the TMC + * (ETR) connected to the input port of the CTCU. + * + * Retruns : coresight_device ptr for the CTCU device if a CTCU is found. + * : NULL otherwise. + */ +struct coresight_device * +tmc_etr_get_ctcu_device(struct tmc_drvdata *drvdata) +{ + struct coresight_device *etr = drvdata->csdev; + union coresight_dev_subtype ctcu_subtype = { + .helper_subtype = CORESIGHT_DEV_SUBTYPE_HELPER_CTCU + }; + + if (!IS_ENABLED(CONFIG_CORESIGHT_CTCU)) + return NULL; + + return coresight_find_output_type(etr->pdata, CORESIGHT_DEV_TYPE_HELPER, + ctcu_subtype); +} +EXPORT_SYMBOL_GPL(tmc_etr_get_ctcu_device); + static const struct etr_buf_operations *etr_buf_ops[] = { [ETR_MODE_FLAT] = &etr_flat_buf_ops, [ETR_MODE_ETR_SG] = &etr_sg_buf_ops,
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index c780f6d5dede..8ea2de08ffd0 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h@@ -470,6 +470,7 @@ static inline uint32_t find_crash_tracedata_crc(struct tmc_drvdata *drvdata, } struct coresight_device *tmc_etr_get_catu_device(struct tmc_drvdata *drvdata); +struct coresight_device *tmc_etr_get_ctcu_device(struct tmc_drvdata *drvdata); void tmc_etr_set_catu_ops(const struct etr_buf_operations *catu); void tmc_etr_remove_catu_ops(void);
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2.34.1