CoreSight

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2640 discussions

[PATCH v6 00/19] CoreSight: Refactor power management for CoreSight path

by Leo Yan

This series focuses on CoreSight path power management. The changes can be divided into four parts for review: Patches 01~06: Refactor the CPU idle flow with moving common code into the CoreSight core layer. Patches 07~14: Add link control during CPU idle. Patches 15~16: Support the sink (TRBE) control during CPU idle. Patches 17~19: Move the CPU hotplug flow into the coresight core layer and simplify the code. This series is rebased on the coresight-next branch and has been verified on Juno-r2 and FVP RevC. --- Changes in v6: - Rebase on the latest coresight-next branch. - Always save and restore TRBE context during idle (Will). - Use get_cpu() / put_cpu() when set the per CPU source pointer. - Link to v5: https://lore.kernel.org/r/20251119-arm_coresight_path_power_management_impr… Changes in v5: - Set the per-CPU source pointer on target CPU (Suzuki). - Reused existed enable/disable buffer functions in TRBE callbacks (James). - Refactored refcount for source devices in SysFS mode. - Released path in cpu-hotplug off flow to avoid memory leak. - Updated ETMv3 driver when move common code into core layer. - Rebased on the latest coresight-next branch. - Link to v4: https://lore.kernel.org/r/20251104-arm_coresight_path_power_management_impr… Changes in v4: - Changed to store path pointer in coresight_device, this is easier for fetching path pointer based on source device (Mike). - Dropped changes in CTI driver. - Only disabled path for CPU hot-plugged off but not enable path for hot-plugged in. - Removed James' test tags for modified patches. - Link to v3: https://lore.kernel.org/r/20250915-arm_coresight_power_management_fix-v3-0-… Signed-off-by: Leo Yan <leo.yan(a)arm.com> --- Leo Yan (18): coresight: sysfs: Validate CPU online status for per-CPU sources coresight: Set per-CPU source pointer coresight: Register CPU PM notifier in core layer coresight: etm4x: Hook CPU PM callbacks coresight: Add callback to determine if PM is needed coresight: etm4x: Remove redundant condition checks in save and restore coresight: syscfg: Use spinlock to protect active variables coresight: Introduce coresight_enable_source() helper coresight: Save active path for system tracers coresight: etm4x: Set active path on target CPU coresight: etm3x: Set active path on target CPU coresight: sysfs: Use source's path pointer for path control coresight: Add 'in_idle' argument to path coresight: Control path during CPU idle coresight: Add PM callbacks for sink device coresight: sysfs: Increment refcount only for system tracers coresight: Take hotplug lock in enable_source_store() for Sysfs mode coresight: Move CPU hotplug callbacks to core layer Yabin Cui (1): coresight: trbe: Save and restore state across CPU low power state drivers/hwtracing/coresight/coresight-catu.c | 1 + drivers/hwtracing/coresight/coresight-core.c | 273 ++++++++++++++++++++- drivers/hwtracing/coresight/coresight-ctcu-core.c | 1 + drivers/hwtracing/coresight/coresight-cti-core.c | 1 + drivers/hwtracing/coresight/coresight-dummy.c | 1 + drivers/hwtracing/coresight/coresight-etb10.c | 1 + drivers/hwtracing/coresight/coresight-etm-perf.c | 2 +- drivers/hwtracing/coresight/coresight-etm3x-core.c | 65 ++--- drivers/hwtracing/coresight/coresight-etm4x-core.c | 153 +++--------- drivers/hwtracing/coresight/coresight-funnel.c | 1 + drivers/hwtracing/coresight/coresight-priv.h | 3 + drivers/hwtracing/coresight/coresight-replicator.c | 1 + drivers/hwtracing/coresight/coresight-stm.c | 1 + drivers/hwtracing/coresight/coresight-syscfg.c | 22 +- drivers/hwtracing/coresight/coresight-syscfg.h | 2 + drivers/hwtracing/coresight/coresight-sysfs.c | 126 +++------- drivers/hwtracing/coresight/coresight-tmc-core.c | 1 + drivers/hwtracing/coresight/coresight-tnoc.c | 2 + drivers/hwtracing/coresight/coresight-tpda.c | 1 + drivers/hwtracing/coresight/coresight-tpdm.c | 1 + drivers/hwtracing/coresight/coresight-tpiu.c | 1 + drivers/hwtracing/coresight/coresight-trbe.c | 60 ++++- drivers/hwtracing/coresight/ultrasoc-smb.c | 1 + include/linux/coresight.h | 11 + 24 files changed, 458 insertions(+), 274 deletions(-) --- base-commit: 9c5ef7a30d9044f8706bd02bfdc4eff7266f3e25 change-id: 20251104-arm_coresight_path_power_management_improvement-dab4966f8280 Best regards, -- Leo Yan <leo.yan(a)arm.com>

7 hours, 7 minutes

[PATCH v2 0/8] coresight: cti: Miscellaneous fixes and CPU PM cleanup

by Leo Yan

The CPU power management issue in the CTI driver was first observed in series [1]; this series resolves that issue. It fixes bugs and removes CPU PM operations from the CoreSight CTI driver, the goal is to use the CoreSight core layer as the central place for CPU power management. Removing CPU PM from CTI driver can avoid conflicts with the core layer. This series can be divided into: Patches 01 ~ 02: Fix spinlock with irqsave and register read with CS lock. Patches 03 ~ 08: Access ASICCTL condintioanlly, remove CPU PM code, and refactor register access in sysfs knob. This series is based on coresight-next branch and has been validated on Juno r2 platforms, pass normal sysfs and perf test, as well as CPU PM stress testing. [1] https://lore.kernel.org/all/20250915-arm_coresight_power_management_fix-v3-… Signed-off-by: Leo Yan <leo.yan(a)arm.com> --- Changes in v2: - Rebased on coresight-next branch (v7.1). - Kept read/write cache value in sysfs knob (Mike). - Link to v1: https://lore.kernel.org/r/20260209-arm_coresight_cti_refactor_v1-v1-0-db71a… --- Leo Yan (8): coresight: cti: Make spinlock usage consistent coresight: cti: Fix register reads coresight: cti: Access ASICCTL only when implemented coresight: cti: Remove CPU power management code coresight: cti: Rename cti_active() to cti_is_active() coresight: cti: Remove hw_powered flag coresight: cti: Remove hw_enabled flag coresight: cti: Properly handle negative offsets in cti_reg32_{show|store}() drivers/hwtracing/coresight/coresight-cti-core.c | 278 ++++------------------ drivers/hwtracing/coresight/coresight-cti-sysfs.c | 171 ++++++------- drivers/hwtracing/coresight/coresight-cti.h | 13 +- 3 files changed, 137 insertions(+), 325 deletions(-) --- base-commit: eef33a7cce239783d0422526a4d786289a936f1b change-id: 20251223-arm_coresight_cti_refactor_v1-76e1bda8b716 Best regards, -- Leo Yan <leo.yan(a)arm.com>

1 day, 23 hours

Re: [PATCH] drivers/hwtracing/coresight: remove unneeded variable in tmc_crashdata_release()

by Suzuki K Poulose

On Sat, 28 Feb 2026 18:23:44 -0400, Elsanti wrote: > The variable 'ret' is initialized to 0, never modified, and returned > directly. Remove it and return 0 explicitly. > > Applied, thanks! [1/1] drivers/hwtracing/coresight: remove unneeded variable in tmc_crashdata_release() https://git.kernel.org/coresight/c/061c39a17136 Best regards, -- Suzuki K Poulose <suzuki.poulose(a)arm.com>

3 days, 8 hours

Re: [PATCH] drivers/hwtracing/coresight: remove unneeded variable in tmc_crashdata_release()

by Leo Yan

On Sat, Feb 28, 2026 at 06:23:44PM -0400, Elsanti wrote: > The variable 'ret' is initialized to 0, never modified, and returned > directly. Remove it and return 0 explicitly. > > Signed-off-by: Elsanti <santiagojoseleal27(a)gmail.com> Reviewed-by: Leo Yan <leo.yan(a)arm.com> > --- > drivers/hwtracing/coresight/coresight-tmc-core.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c > index 36599c431be6..e29012c451c5 100644 > --- a/drivers/hwtracing/coresight/coresight-tmc-core.c > +++ b/drivers/hwtracing/coresight/coresight-tmc-core.c > @@ -401,7 +401,6 @@ static ssize_t tmc_crashdata_read(struct file *file, char __user *data, > > static int tmc_crashdata_release(struct inode *inode, struct file *file) > { > - int ret = 0; > unsigned long flags; > struct tmc_resrv_buf *rbuf; > struct tmc_drvdata *drvdata = container_of(file->private_data, > @@ -414,7 +413,7 @@ static int tmc_crashdata_release(struct inode *inode, struct file *file) > raw_spin_unlock_irqrestore(&drvdata->spinlock, flags); > > dev_dbg(&drvdata->csdev->dev, "%s: released\n", __func__); > - return ret; > + return 0; > } > > static const struct file_operations tmc_crashdata_fops = { > -- > 2.53.0 > >

3 days, 8 hours

Re: [PATCH v3 0/3] Enable CTCU and ETR devices for multiple QCOM platforms

by Suzuki K Poulose

Hello, On 04/02/2026 02:22, Jie Gan wrote: > The DT‑binding patch adds platform‑specific compatibles for the > CTCU device, and the following Qualcomm platforms are included: > Kaanapali > Pakala(sm8750) > Hamoa(x1e80100) > Glymur Given this is predominantly DTS changes, and there is very low chances of a conflict with the binding yaml change, I would recommend this to go via soc or the qcom platform tree. For the series: Acked-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> > > Since the base Coresight DT patches for the Kaanapali and Glymur > platforms have not yet been applied, I created DT patches only > for the Pakala and Hamoa platforms. I will submit the Kaanapali > and Glymur patches once their corresponding base Coresight DT patches > are merged. > > The Hamoa‑related patches were posted in a separate email, and I > have included them in the current patch series. > > Link to the previous Hamoa patch series: > https://lore.kernel.org/all/20251106-enable-etr-and-ctcu-for-hamoa-v2-0-cdb… > > Signed-off-by: Jie Gan <jie.gan(a)oss.qualcomm.com> > --- > Changes in v3: > - change back to the numeric compatible from hamoa to x1e80100. > - Link to v2: https://lore.kernel.org/r/20260203-enable-ctcu-and-etr-v2-0-aacc7bd7eccb@os… > > Changes in v2: > - change back to the numeric compatible from pakala to sm8750. > - Link to v1: https://lore.kernel.org/r/20260203-enable-ctcu-and-etr-v1-0-a5371a2ec2b8@os… > > --- > Jie Gan (3): > dt-binding: document QCOM platforms for CTCU device > arm64: dts: qcom: hamoa: enable ETR and CTCU devices > arm64: dts: qcom: sm8750: enable ETR and CTCU devices > > .../bindings/arm/qcom,coresight-ctcu.yaml | 4 + > arch/arm64/boot/dts/qcom/hamoa.dtsi | 160 ++++++++++++++++++- > arch/arm64/boot/dts/qcom/sm8750.dtsi | 177 +++++++++++++++++++++ > 3 files changed, 340 insertions(+), 1 deletion(-) > --- > base-commit: 193579fe01389bc21aff0051d13f24e8ea95b47d > change-id: 20260203-enable-ctcu-and-etr-31f9e9d1088d > > Best regards,

6 days, 7 hours

[PATCH v2] MAINTAINERS: Change e-mail address for reviewer

by Mike Leach

From: Mike Leach <mike.leach(a)linaro.org> My e-mail address for linux work is changing to mike.leach(a)arm.com from 1st Jan 2026. Update MAINTAINERS file accordingly Updated .mailmap file accordingly. Signed-off-by: Mike Leach <mike.leach(a)linaro.org> Signed-off-by: Mike Leach <mike.leach(a)arm.com> --- Changes since v1: Add sign off in new email & change .mailmap (Suzuki) --- .mailmap | 1 + MAINTAINERS | 4 ++-- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/.mailmap b/.mailmap index c124a1306d26..064c00568d20 100644 --- a/.mailmap +++ b/.mailmap @@ -566,6 +566,7 @@ Michel Lespinasse <michel(a)lespinasse.org> <walken(a)google.com> Michel Lespinasse <michel(a)lespinasse.org> <walken(a)zoy.org> Mickaël Salaün <mic(a)digikod.net> <mic(a)linux.microsoft.com> Miguel Ojeda <ojeda(a)kernel.org> <miguel.ojeda.sandonis(a)gmail.com> +Mike Leach <mike.leach(a)arm.com> <mike.leach(a)linaro.org> Mike Rapoport <rppt(a)kernel.org> <mike(a)compulab.co.il> Mike Rapoport <rppt(a)kernel.org> <mike.rapoport(a)gmail.com> Mike Rapoport <rppt(a)kernel.org> <rppt(a)linux.ibm.com> diff --git a/MAINTAINERS b/MAINTAINERS index 4d879f6a7b51..257d2fcb9651 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2719,7 +2719,7 @@ N: digicolor ARM/CORESIGHT FRAMEWORK AND DRIVERS M: Suzuki K Poulose <suzuki.poulose(a)arm.com> -R: Mike Leach <mike.leach(a)linaro.org> +R: Mike Leach <mike.leach(a)arm.com> R: James Clark <james.clark(a)linaro.org> L: coresight(a)lists.linaro.org (moderated for non-subscribers) L: linux-arm-kernel(a)lists.infradead.org (moderated for non-subscribers) @@ -20725,7 +20725,7 @@ PERFORMANCE EVENTS TOOLING ARM64 R: John Garry <john.g.garry(a)oracle.com> R: Will Deacon <will(a)kernel.org> R: James Clark <james.clark(a)linaro.org> -R: Mike Leach <mike.leach(a)linaro.org> +R: Mike Leach <mike.leach(a)arm.com> R: Leo Yan <leo.yan(a)linux.dev> L: linux-arm-kernel(a)lists.infradead.org (moderated for non-subscribers) S: Supported -- 2.43.0

1 week

Re: [PATCH v6 01/12] dt-bindings: document access-controllers property for coresight peripherals

by Suzuki K Poulose

On 26/02/2026 10:54, Gatien CHEVALLIER wrote: > > > On 2/26/26 11:46, Suzuki K Poulose wrote: >> Hi >> >> On 26/02/2026 10:30, Gatien Chevallier wrote: >>> Document the access-controllers for coresight peripherals in case some >>> access checks need to be performed to use them. >>> >>> Signed-off-by: Gatien Chevallier <gatien.chevallier(a)foss.st.com> >>> Reviewed-by: Rob Herring (Arm) <robh(a)kernel.org> >>> --- >>> Documentation/devicetree/bindings/arm/arm,coresight- >>> cti.yaml | 3 +++ >>> .../devicetree/bindings/arm/arm,coresight-dynamic- >>> funnel.yaml | 3 +++ >>> Documentation/devicetree/bindings/arm/arm,coresight- >>> etm.yaml | 3 +++ >>> Documentation/devicetree/bindings/arm/arm,coresight- >>> stm.yaml | 3 +++ >>> Documentation/devicetree/bindings/arm/arm,coresight- >>> tmc.yaml | 3 +++ >>> Documentation/devicetree/bindings/arm/arm,coresight- >>> tpiu.yaml | 3 +++ >> >> Are you sure, you are not missing "replicator" in the list ? >> >> Otherwise, looks good to me. >> >> Acked-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> >> > > The replicator is not present on the Linux side on stm32mp1x platforms > (Only present for the Cortex M4 co-processor on stm32mp15x platforms). > On stm32mp2x platforms, it will be necessary so it will be added in the > related P-R because we'll need the same debug access check mechanism. Fair enough. It looked a bit odd to me with TMC and TPIU both in the list without a Replicator. Acked-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> > >> >> >>> 6 files changed, 18 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight- >>> cti.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml >>> index 2a91670ccb8c..949444aba1f8 100644 >>> --- a/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml >>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml >>> @@ -128,6 +128,9 @@ properties: >>> "#address-cells": >>> const: 1 >>> + access-controllers: >>> + maxItems: 1 >>> + >>> patternProperties: >>> '^trig-conns@([0-9]+)$': >>> type: object >>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight- >>> dynamic-funnel.yaml b/Documentation/devicetree/bindings/arm/ >>> arm,coresight-dynamic-funnel.yaml >>> index b74db15e5f8a..b0693cd46d27 100644 >>> --- a/Documentation/devicetree/bindings/arm/arm,coresight-dynamic- >>> funnel.yaml >>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-dynamic- >>> funnel.yaml >>> @@ -78,6 +78,9 @@ properties: >>> description: Output connection to CoreSight Trace bus >>> $ref: /schemas/graph.yaml#/properties/port >>> + access-controllers: >>> + maxItems: 1 >>> + >>> required: >>> - compatible >>> - reg >>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight- >>> etm.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml >>> index 71f2e1ed27e5..10ebbbeadf93 100644 >>> --- a/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml >>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml >>> @@ -118,6 +118,9 @@ properties: >>> description: Output connection from the ETM to CoreSight >>> Trace bus. >>> $ref: /schemas/graph.yaml#/properties/port >>> + access-controllers: >>> + maxItems: 1 >>> + >>> required: >>> - compatible >>> - clocks >>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight- >>> stm.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml >>> index 378380c3f5aa..f243e76f597f 100644 >>> --- a/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml >>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml >>> @@ -73,6 +73,9 @@ properties: >>> description: Output connection to the CoreSight Trace bus. >>> $ref: /schemas/graph.yaml#/properties/port >>> + access-controllers: >>> + maxItems: 1 >>> + >>> required: >>> - compatible >>> - reg >>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight- >>> tmc.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml >>> index 96dd5b5f771a..9dc096698c65 100644 >>> --- a/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml >>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml >>> @@ -128,6 +128,9 @@ properties: >>> - const: tracedata >>> - const: metadata >>> + access-controllers: >>> + maxItems: 1 >>> + >>> required: >>> - compatible >>> - reg >>> diff --git a/Documentation/devicetree/bindings/arm/arm,coresight- >>> tpiu.yaml b/Documentation/devicetree/bindings/arm/arm,coresight- >>> tpiu.yaml >>> index a207f6899e67..29bbc3961fdf 100644 >>> --- a/Documentation/devicetree/bindings/arm/arm,coresight-tpiu.yaml >>> +++ b/Documentation/devicetree/bindings/arm/arm,coresight-tpiu.yaml >>> @@ -70,6 +70,9 @@ properties: >>> description: Input connection from the CoreSight Trace bus. >>> $ref: /schemas/graph.yaml#/properties/port >>> + access-controllers: >>> + maxItems: 1 >>> + >>> required: >>> - compatible >>> - reg >>> >> >

1 week

Re: [PATCH v6 01/12] dt-bindings: document access-controllers property for coresight peripherals

by Suzuki K Poulose

Hi On 26/02/2026 10:30, Gatien Chevallier wrote: > Document the access-controllers for coresight peripherals in case some > access checks need to be performed to use them. > > Signed-off-by: Gatien Chevallier <gatien.chevallier(a)foss.st.com> > Reviewed-by: Rob Herring (Arm) <robh(a)kernel.org> > --- > Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml | 3 +++ > .../devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml | 3 +++ > Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml | 3 +++ > Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml | 3 +++ > Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml | 3 +++ > Documentation/devicetree/bindings/arm/arm,coresight-tpiu.yaml | 3 +++ Are you sure, you are not missing "replicator" in the list ? Otherwise, looks good to me. Acked-by: Suzuki K Poulose <suzuki.poulose(a)arm.com> > 6 files changed, 18 insertions(+) > > diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml > index 2a91670ccb8c..949444aba1f8 100644 > --- a/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml > +++ b/Documentation/devicetree/bindings/arm/arm,coresight-cti.yaml > @@ -128,6 +128,9 @@ properties: > "#address-cells": > const: 1 > > + access-controllers: > + maxItems: 1 > + > patternProperties: > '^trig-conns@([0-9]+)$': > type: object > diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml > index b74db15e5f8a..b0693cd46d27 100644 > --- a/Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml > +++ b/Documentation/devicetree/bindings/arm/arm,coresight-dynamic-funnel.yaml > @@ -78,6 +78,9 @@ properties: > description: Output connection to CoreSight Trace bus > $ref: /schemas/graph.yaml#/properties/port > > + access-controllers: > + maxItems: 1 > + > required: > - compatible > - reg > diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml > index 71f2e1ed27e5..10ebbbeadf93 100644 > --- a/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml > +++ b/Documentation/devicetree/bindings/arm/arm,coresight-etm.yaml > @@ -118,6 +118,9 @@ properties: > description: Output connection from the ETM to CoreSight Trace bus. > $ref: /schemas/graph.yaml#/properties/port > > + access-controllers: > + maxItems: 1 > + > required: > - compatible > - clocks > diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml > index 378380c3f5aa..f243e76f597f 100644 > --- a/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml > +++ b/Documentation/devicetree/bindings/arm/arm,coresight-stm.yaml > @@ -73,6 +73,9 @@ properties: > description: Output connection to the CoreSight Trace bus. > $ref: /schemas/graph.yaml#/properties/port > > + access-controllers: > + maxItems: 1 > + > required: > - compatible > - reg > diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml > index 96dd5b5f771a..9dc096698c65 100644 > --- a/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml > +++ b/Documentation/devicetree/bindings/arm/arm,coresight-tmc.yaml > @@ -128,6 +128,9 @@ properties: > - const: tracedata > - const: metadata > > + access-controllers: > + maxItems: 1 > + > required: > - compatible > - reg > diff --git a/Documentation/devicetree/bindings/arm/arm,coresight-tpiu.yaml b/Documentation/devicetree/bindings/arm/arm,coresight-tpiu.yaml > index a207f6899e67..29bbc3961fdf 100644 > --- a/Documentation/devicetree/bindings/arm/arm,coresight-tpiu.yaml > +++ b/Documentation/devicetree/bindings/arm/arm,coresight-tpiu.yaml > @@ -70,6 +70,9 @@ properties: > description: Input connection from the CoreSight Trace bus. > $ref: /schemas/graph.yaml#/properties/port > > + access-controllers: > + maxItems: 1 > + > required: > - compatible > - reg >

1 week

Re: [PATCH] coresight: ctcu: fix the spin_bug

by Suzuki K Poulose

On Thu, 19 Feb 2026 22:46:57 +0800, Jie Gan wrote: > Acquiring an uninitialized raw_spin_lock is invalid and may trigger > unexpected behavior or spin_bug. > > Applied, thanks! [1/1] coresight: ctcu: fix the spin_bug https://git.kernel.org/coresight/c/36ffbbc2b387 Best regards, -- Suzuki K Poulose <suzuki.poulose(a)arm.com>

1 week

[PATCH 0/8] coresight: cti: Miscellaneous fixes and CPU PM cleanup

by Leo Yan

The CPU power management issue in the CTI driver was first observed in series [1]; this series resolves that issue. It fixes bugs and removes CPU PM operations from the CoreSight CTI driver, the goal is to use the CoreSight core layer as the central place for CPU power management. Removing CPU PM from CTI driver can avoid conflicts with the core layer. Based on review of the Arm ARM, ASICCTL is the only CTI register that could potentially reside in the CPU power domain. However, this is considered highly unlikely for the following reasons: - Standard Arm CTIs place the ASICCTL register in the debug power domain; - ASICCTL is implemented only when CTIDEVID.EXTMUXNUM is non-zero, which is rare for CPU CTIs. As a result, it is safe to remove the CPU PM code as done in this series. In addition, avoiding support local CPU access (via SMP calls) to ASICCTL significantly reduces driver complexity. If a future hardware implements ASICCTL in the CPU power domain, we can consider adding a property to describe that characteristic. That said, from a software point of view, keeping all CTI registers in the same power domain is preferable, as it makes the driver implementation much simpler. This series can be divided into: Patches 01 ~ 02: Fix spinlock with irqsave and register read with CS lock. Patches 03 ~ 08: Access ASICCTL condintioanlly, remove CPU PM code, and refactor register access in sysfs knob. This series is based on coresight-next branch and has been validated on Juno r1 and r2 platforms, pass normal sysfs and perf test, as well as CPU PM stress testing. [1] https://lore.kernel.org/all/20250915-arm_coresight_power_management_fix-v3-… Signed-off-by: Leo Yan <leo.yan(a)arm.com> --- Leo Yan (8): coresight: cti: Make spinlock usage consistent coresight: cti: Fix register reads coresight: cti: Access ASICCTL only when implemented coresight: cti: Remove CPU power management code coresight: cti: Rename cti_active() to cti_is_active() coresight: cti: Remove hw_powered flag coresight: cti: Remove hw_enabled flag coresight: cti: Refactor cti_reg32_{show|store}() drivers/hwtracing/coresight/coresight-cti-core.c | 278 ++++------------------ drivers/hwtracing/coresight/coresight-cti-sysfs.c | 168 ++++++------- drivers/hwtracing/coresight/coresight-cti.h | 13 +- 3 files changed, 134 insertions(+), 325 deletions(-) --- base-commit: eebe8dbd8630f51cf70b1f68a440cd3d7f7a914d change-id: 20251223-arm_coresight_cti_refactor_v1-76e1bda8b716 Best regards, -- Leo Yan <leo.yan(a)arm.com>

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