CoreSight June 2025

coresight@lists.linaro.org

7 participants
13 discussions

[PATCH] coresight: trbe: Add ISB after TRBLIMITR write

by James Clark

DEN0154 states that hardware will be allowed to ignore writes to TRB* registers while the trace buffer is enabled. Add an ISB to ensure that it's disabled before clearing the other registers. This is purely defensive because it's expected that arm_trbe_disable() would be called before teardown which has the required ISB. Fixes: a2b579c41fe9 ("coresight: trbe: Remove redundant disable call") Signed-off-by: James Clark <james.clark(a)linaro.org> --- drivers/hwtracing/coresight/coresight-trbe.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c index 8267dd1a2130..10f3fb401edf 100644 --- a/drivers/hwtracing/coresight/coresight-trbe.c +++ b/drivers/hwtracing/coresight/coresight-trbe.c @@ -257,6 +257,7 @@ static void trbe_drain_and_disable_local(struct trbe_cpudata *cpudata) static void trbe_reset_local(struct trbe_cpudata *cpudata) { write_sysreg_s(0, SYS_TRBLIMITR_EL1); + isb(); trbe_drain_buffer(); write_sysreg_s(0, SYS_TRBPTR_EL1); write_sysreg_s(0, SYS_TRBBASER_EL1); --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250609-james-cs-trblimitr-isb-523f20d874d6 Best regards, -- James Clark <james.clark(a)linaro.org>

1 week, 5 days

[PATCH v8 0/2] coresight: Add Coresight Trace Network On Chip driver

by Yuanfang Zhang

The Trace Network On Chip (TNOC) is an integration hierarchy which is a hardware component that integrates the functionalities of TPDA and funnels. It collects trace from subsystems and transfers it to coresight sink. In addition to the generic TNOC mentioned above, there is also a special type of TNOC called Interconnect TNOC. Unlike the generic TNOC, the Interconnect TNOC doesn't need ATID. Its primary function is to connect the source of subsystems to the Aggregator TNOC. Its driver is different from this patch and will describe it and upstream its driver separately. Signed-off-by: Yuanfang Zhang <quic_yuanfang(a)quicinc.com> --- Changes in v8: - Add sysfs node to expose atid. - Link to v7: https://lore.kernel.org/r/20250523-trace-noc-v7-0-d65edbab2997@quicinc.com Changes in v7: - Move the content in header file into coresight-tnoc.c. - Use scoped_guard() to replace spin_lock(). - Invoke coresight_trace_id_put_system_id() for registration failure. - Link to v6: https://lore.kernel.org/r/20250522-trace-noc-v6-0-f5a9bcae90ee@quicinc.com Changes in v6: - Add a newline after return statements. - Use 'x &= foo' to replace 'x = x & foo'. - Use 'x |= foo' to replace 'x = x | foo'. - Link to v5: https://lore.kernel.org/r/20250512-trace-noc-v5-0-f2ef070baee5@quicinc.com Changes in v5: - update cover-letter to describe the Interconnect TNOC. - Link to v4: https://lore.kernel.org/r/20250415-trace-noc-v4-0-979938fedfd8@quicinc.com Changes in v4: - Fix dt_binding warning. - update mask of trace_noc amba_id. - Modify driver comments. - rename TRACE_NOC_SYN_VAL to TRACE_NOC_SYNC_INTERVAL. - Link to v3: https://lore.kernel.org/r/20250411-trace-noc-v3-0-1f19ddf7699b@quicinc.com Changes in v3: - Remove unnecessary sysfs nodes. - update commit messages. - Use 'writel' instead of 'write_relaxed' when writing to the register for the last time. - Add trace_id ops. - Link to v2: https://lore.kernel.org/r/20250226-trace-noc-driver-v2-0-8afc6584afc5@quici… Changes in v2: - Modified the format of DT binging file. - Fix compile warnings. - Link to v1: https://lore.kernel.org/r/46643089-b88d-49dc-be05-7bf0bb21f847@quicinc.com --- Yuanfang Zhang (2): dt-bindings: arm: Add device Trace Network On Chip definition coresight: add coresight Trace Network On Chip driver .../bindings/arm/qcom,coresight-tnoc.yaml | 111 ++++++++++ drivers/hwtracing/coresight/Kconfig | 13 ++ drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-tnoc.c | 242 +++++++++++++++++++++ 4 files changed, 367 insertions(+) --- base-commit: a2cc6ff5ec8f91bc463fd3b0c26b61166a07eb11 change-id: 20250403-trace-noc-f8286b30408e Best regards, -- Yuanfang Zhang <quic_yuanfang(a)quicinc.com>

1 week, 6 days

[PATCH v6 0/2] coresight: Add Coresight Trace Network On Chip driver

by Yuanfang Zhang

The Trace Network On Chip (TNOC) is an integration hierarchy which is a hardware component that integrates the functionalities of TPDA and funnels. It collects trace from subsystems and transfers it to coresight sink. In addition to the generic TNOC mentioned above, there is also a special type of TNOC called Interconnect TNOC. Unlike the generic TNOC, the Interconnect TNOC doesn't need ATID. Its primary function is to connect the source of subsystems to the Aggregator TNOC. Its driver is different from this patch and will describe it and upstream its driver separately. Signed-off-by: Yuanfang Zhang <quic_yuanfang(a)quicinc.com> --- Changes in v6: - Add a newline after return statements. - Use 'x &= foo' to replace 'x = x & foo'. - Use 'x |= foo' to replace 'x = x | foo'. - Link to v5: https://lore.kernel.org/r/20250512-trace-noc-v5-0-f2ef070baee5@quicinc.com Changes in v5: - update cover-letter to describe the Interconnect TNOC. - Link to v4: https://lore.kernel.org/r/20250415-trace-noc-v4-0-979938fedfd8@quicinc.com Changes in v4: - Fix dt_binding warning. - update mask of trace_noc amba_id. - Modify driver comments. - rename TRACE_NOC_SYN_VAL to TRACE_NOC_SYNC_INTERVAL. - Link to v3: https://lore.kernel.org/r/20250411-trace-noc-v3-0-1f19ddf7699b@quicinc.com Changes in v3: - Remove unnecessary sysfs nodes. - update commit messages. - Use 'writel' instead of 'write_relaxed' when writing to the register for the last time. - Add trace_id ops. - Link to v2: https://lore.kernel.org/r/20250226-trace-noc-driver-v2-0-8afc6584afc5@quici… Changes in v2: - Modified the format of DT binging file. - Fix compile warnings. - Link to v1: https://lore.kernel.org/r/46643089-b88d-49dc-be05-7bf0bb21f847@quicinc.com --- Yuanfang Zhang (2): dt-bindings: arm: Add device Trace Network On Chip definition coresight: add coresight Trace Network On Chip driver .../bindings/arm/qcom,coresight-tnoc.yaml | 111 ++++++++++++ drivers/hwtracing/coresight/Kconfig | 13 ++ drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-tnoc.c | 192 +++++++++++++++++++++ drivers/hwtracing/coresight/coresight-tnoc.h | 34 ++++ 5 files changed, 351 insertions(+) --- base-commit: a2cc6ff5ec8f91bc463fd3b0c26b61166a07eb11 change-id: 20250403-trace-noc-f8286b30408e Best regards, -- Yuanfang Zhang <quic_yuanfang(a)quicinc.com>

2 weeks, 2 days

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CoreSight June 2025