From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: Leo Yan <leo.yan@arm.com>, Mike Leach <mike.leach@arm.com>,
James Clark <james.clark@linaro.org>,
Yeoreum Yun <yeoreum.yun@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will@kernel.org>, Yabin Cui <yabinc@google.com>,
Keita Morisaki <keyz@google.com>,
Yuanfang Zhang <quic_yuanfang@quicinc.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v6 01/19] coresight: sysfs: Validate CPU online status for per-CPU sources
Date: Fri, 13 Mar 2026 11:03:02 +0000 [thread overview]
Message-ID: <13fbfe69-2d7f-49fa-a191-98aea3fb1f21@arm.com> (raw)
In-Reply-To: <20260305-arm_coresight_path_power_management_improvement-v6-1-eff765d211a9@arm.com>
On 05/03/2026 10:17, Leo Yan wrote:
> The current SysFS flow first enables the links and sink, then rolls back
> to disable them if the source fails to enable. This failure can occur if
> the associated CPU is offline, which causes the SMP call to fail.
>
> Populate CPU ID into the coresight_device structure, for components that
> are not CPU bound, set this field to -1.
>
> Validate whether the associated CPU is online for a per-CPU tracer. If
> the CPU is offline, return -ENODEV and bail out.
>
> Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
> Reviewed-by: Mike Leach <mike.leach@linaro.org>
> Tested-by: James Clark <james.clark@linaro.org>
> Signed-off-by: Leo Yan <leo.yan@arm.com>
While this works, how about we make it an explicit buy in from the
driver for CPU bound ?
e.g., add a flag in the coresight_desc.flags = CORESIGHT_DESC_CPU_BOUND
and then desc.cpu describes the associated CPU. Otherwise, defaults to
-1. That way you could restrict the changes to only those that need the
CPU (ETMx and CTIs ?) Also makes any new driver safe.
Cheers
Suzuki
> ---
> drivers/hwtracing/coresight/coresight-catu.c | 1 +
> drivers/hwtracing/coresight/coresight-core.c | 1 +
> 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-etm3x-core.c | 1 +
> drivers/hwtracing/coresight/coresight-etm4x-core.c | 1 +
> drivers/hwtracing/coresight/coresight-funnel.c | 1 +
> drivers/hwtracing/coresight/coresight-replicator.c | 1 +
> drivers/hwtracing/coresight/coresight-stm.c | 1 +
> drivers/hwtracing/coresight/coresight-sysfs.c | 3 +++
> 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 | 1 +
> drivers/hwtracing/coresight/ultrasoc-smb.c | 1 +
> include/linux/coresight.h | 4 ++++
> 20 files changed, 26 insertions(+)
>
> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
> index ce71dcddfca2558eddd625de58a709b151f2e07e..8f22f12e260787335cb71b06ba7c8aeccf603fc8 100644
> --- a/drivers/hwtracing/coresight/coresight-catu.c
> +++ b/drivers/hwtracing/coresight/coresight-catu.c
> @@ -573,6 +573,7 @@ static int __catu_probe(struct device *dev, struct resource *res)
> catu_desc.type = CORESIGHT_DEV_TYPE_HELPER;
> catu_desc.subtype.helper_subtype = CORESIGHT_DEV_SUBTYPE_HELPER_CATU;
> catu_desc.ops = &catu_ops;
> + catu_desc.cpu = -1;
>
> coresight_clear_self_claim_tag(&catu_desc.access);
> drvdata->csdev = coresight_register(&catu_desc);
> diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
> index 46f247f73cf64a97b9353b84ba5b76b991676f5f..f191a0fe802ac6ae1342872e01fff463775c8a20 100644
> --- a/drivers/hwtracing/coresight/coresight-core.c
> +++ b/drivers/hwtracing/coresight/coresight-core.c
> @@ -1341,6 +1341,7 @@ struct coresight_device *coresight_register(struct coresight_desc *desc)
> csdev->ops = desc->ops;
> csdev->access = desc->access;
> csdev->orphan = true;
> + csdev->cpu = desc->cpu;
>
> csdev->dev.type = &coresight_dev_type[desc->type];
> csdev->dev.groups = desc->groups;
> diff --git a/drivers/hwtracing/coresight/coresight-ctcu-core.c b/drivers/hwtracing/coresight/coresight-ctcu-core.c
> index 9043cad42f01e6d1facb07a1f85623250535ed9c..58113cc1add3fd37afec1b5bc11eb26c0f95b339 100644
> --- a/drivers/hwtracing/coresight/coresight-ctcu-core.c
> +++ b/drivers/hwtracing/coresight/coresight-ctcu-core.c
> @@ -226,6 +226,7 @@ static int ctcu_probe(struct platform_device *pdev)
> desc.dev = dev;
> desc.ops = &ctcu_ops;
> desc.access = CSDEV_ACCESS_IOMEM(base);
> + desc.cpu = -1;
> raw_spin_lock_init(&drvdata->spin_lock);
>
> drvdata->csdev = coresight_register(&desc);
> diff --git a/drivers/hwtracing/coresight/coresight-cti-core.c b/drivers/hwtracing/coresight/coresight-cti-core.c
> index 2f4c9362709a90b12a1aeb5016905b7d4474b912..5f4ff84f20912a3f8405448d028c742a7c860d26 100644
> --- a/drivers/hwtracing/coresight/coresight-cti-core.c
> +++ b/drivers/hwtracing/coresight/coresight-cti-core.c
> @@ -725,6 +725,7 @@ static int cti_probe(struct amba_device *adev, const struct amba_id *id)
> cti_desc.ops = &cti_ops;
> cti_desc.groups = drvdata->ctidev.con_groups;
> cti_desc.dev = dev;
> + cti_desc.cpu = drvdata->ctidev.cpu;
>
> coresight_clear_self_claim_tag(&cti_desc.access);
> drvdata->csdev = coresight_register(&cti_desc);
> diff --git a/drivers/hwtracing/coresight/coresight-dummy.c b/drivers/hwtracing/coresight/coresight-dummy.c
> index c176a2f57300fd8cd5d153be5ccb6faaef96023d..788fb28c74a901382a28326ba230455125a471ee 100644
> --- a/drivers/hwtracing/coresight/coresight-dummy.c
> +++ b/drivers/hwtracing/coresight/coresight-dummy.c
> @@ -176,6 +176,7 @@ static int dummy_probe(struct platform_device *pdev)
>
> desc.pdata = pdev->dev.platform_data;
> desc.dev = &pdev->dev;
> + desc.cpu = -1;
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev)) {
> ret = PTR_ERR(drvdata->csdev);
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index b952a1d47f12f44c15cc845914691305713028c4..b8df9e3c93df167dabd39d90b6f9491def0f6b90 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -768,6 +768,7 @@ static int etb_probe(struct amba_device *adev, const struct amba_id *id)
> desc.pdata = pdata;
> desc.dev = dev;
> desc.groups = coresight_etb_groups;
> + desc.cpu = -1;
>
> coresight_clear_self_claim_tag(&desc.access);
> drvdata->csdev = coresight_register(&desc);
> diff --git a/drivers/hwtracing/coresight/coresight-etm3x-core.c b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> index a547a6d2e0bde84748f753e5529d316c4f5e82e2..2e9e824309bdab5c2983ed1a3e61b27c9d822278 100644
> --- a/drivers/hwtracing/coresight/coresight-etm3x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm3x-core.c
> @@ -891,6 +891,7 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id)
> desc.pdata = pdata;
> desc.dev = dev;
> desc.groups = coresight_etm_groups;
> + desc.cpu = drvdata->cpu;
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev))
> return PTR_ERR(drvdata->csdev);
> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> index d565a73f0042e3e0b21fcf9cb94009cc25834d3d..add4cc9c1eca42b58d8f9d7bb3dc8d2ea1241ee2 100644
> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
> @@ -2260,6 +2260,7 @@ static int etm4_add_coresight_dev(struct etm4_init_arg *init_arg)
> desc.pdata = pdata;
> desc.dev = dev;
> desc.groups = coresight_etmv4_groups;
> + desc.cpu = drvdata->cpu;
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev))
> return PTR_ERR(drvdata->csdev);
> diff --git a/drivers/hwtracing/coresight/coresight-funnel.c b/drivers/hwtracing/coresight/coresight-funnel.c
> index 3f56ceccd8c9f6deaaf783a06a0d19fb06eff7c4..c281c36a84015a73023ba9db2eae29ce13c6e880 100644
> --- a/drivers/hwtracing/coresight/coresight-funnel.c
> +++ b/drivers/hwtracing/coresight/coresight-funnel.c
> @@ -261,6 +261,7 @@ static int funnel_probe(struct device *dev, struct resource *res)
> desc.ops = &funnel_cs_ops;
> desc.pdata = pdata;
> desc.dev = dev;
> + desc.cpu = -1;
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev))
> return PTR_ERR(drvdata->csdev);
> diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
> index 07fc04f53b88fdec7ae18d3000046fe74c0cec9d..e947e8f0e8c4bfc4d85da385663ea3805a9b1df1 100644
> --- a/drivers/hwtracing/coresight/coresight-replicator.c
> +++ b/drivers/hwtracing/coresight/coresight-replicator.c
> @@ -271,6 +271,7 @@ static int replicator_probe(struct device *dev, struct resource *res)
> desc.ops = &replicator_cs_ops;
> desc.pdata = dev->platform_data;
> desc.dev = dev;
> + desc.cpu = -1;
>
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev))
> diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
> index aca6cec7885a551ad5960986b1cdf08baa6b5a94..d60fdec640c760c4648ece8d28636936a1b9fb9b 100644
> --- a/drivers/hwtracing/coresight/coresight-stm.c
> +++ b/drivers/hwtracing/coresight/coresight-stm.c
> @@ -899,6 +899,7 @@ static int __stm_probe(struct device *dev, struct resource *res)
> desc.pdata = pdata;
> desc.dev = dev;
> desc.groups = coresight_stm_groups;
> + desc.cpu = -1;
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev)) {
> ret = PTR_ERR(drvdata->csdev);
> diff --git a/drivers/hwtracing/coresight/coresight-sysfs.c b/drivers/hwtracing/coresight/coresight-sysfs.c
> index d2a6ed8bcc74d64dccc735463f14790b4e80d101..7c7d3a3cb9f18a9dfa78eb5c19dda43fa6656271 100644
> --- a/drivers/hwtracing/coresight/coresight-sysfs.c
> +++ b/drivers/hwtracing/coresight/coresight-sysfs.c
> @@ -162,6 +162,9 @@ static int coresight_validate_source_sysfs(struct coresight_device *csdev,
> return -EINVAL;
> }
>
> + if (coresight_is_percpu_source(csdev) && !cpu_online(csdev->cpu))
> + return -ENODEV;
> +
> return 0;
> }
>
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c
> index c89fe996af23194c7e59432ce39ce20bb65937cf..5af06ae8b44d0e53a479822f25ab58e692a9696b 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-core.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-core.c
> @@ -863,6 +863,7 @@ static int __tmc_probe(struct device *dev, struct resource *res)
> }
> dev->platform_data = pdata;
> desc.pdata = pdata;
> + desc.cpu = -1;
>
> coresight_clear_self_claim_tag(&desc.access);
> drvdata->csdev = coresight_register(&desc);
> diff --git a/drivers/hwtracing/coresight/coresight-tnoc.c b/drivers/hwtracing/coresight/coresight-tnoc.c
> index 96a25877b8240f20921efa979a361eb473c05600..c8530c625c0b04699e82b602e556718717a239f7 100644
> --- a/drivers/hwtracing/coresight/coresight-tnoc.c
> +++ b/drivers/hwtracing/coresight/coresight-tnoc.c
> @@ -226,6 +226,8 @@ static int _tnoc_probe(struct device *dev, struct resource *res)
> desc.dev = dev;
> desc.access = CSDEV_ACCESS_IOMEM(drvdata->base);
> desc.groups = coresight_tnoc_groups;
> + desc.cpu = -1;
> +
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev)) {
> if (drvdata->atid > 0)
> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
> index 89c8f71f0aff06e87971976efb23feb0057fcce6..b96dfc697b1d881b853839dce196e3024f489fc3 100644
> --- a/drivers/hwtracing/coresight/coresight-tpda.c
> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
> @@ -593,6 +593,7 @@ static int tpda_probe(struct amba_device *adev, const struct amba_id *id)
> desc.dev = &adev->dev;
> desc.groups = tpda_attr_grps;
> desc.access = CSDEV_ACCESS_IOMEM(base);
> + desc.cpu = -1;
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev))
> return PTR_ERR(drvdata->csdev);
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index da77bdaad0a4519bd4e0653cc92e2a333e59e60d..b61cc260ec0b043a96772a47ca0dd536ef12e290 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -1423,6 +1423,7 @@ static int tpdm_probe(struct device *dev, struct resource *res)
> desc.pdata = dev->platform_data;
> desc.dev = dev;
> desc.access = CSDEV_ACCESS_IOMEM(base);
> + desc.cpu = -1;
> if (res)
> desc.groups = tpdm_attr_grps;
> drvdata->csdev = coresight_register(&desc);
> diff --git a/drivers/hwtracing/coresight/coresight-tpiu.c b/drivers/hwtracing/coresight/coresight-tpiu.c
> index b8560b140e0fa4bf8bf1e5c60fe67077b11798fd..a5254f36820b9e75047241d8690ff39b0f62b143 100644
> --- a/drivers/hwtracing/coresight/coresight-tpiu.c
> +++ b/drivers/hwtracing/coresight/coresight-tpiu.c
> @@ -169,6 +169,7 @@ static int __tpiu_probe(struct device *dev, struct resource *res)
> desc.ops = &tpiu_cs_ops;
> desc.pdata = pdata;
> desc.dev = dev;
> + desc.cpu = -1;
> drvdata->csdev = coresight_register(&desc);
>
> if (!IS_ERR(drvdata->csdev))
> diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
> index 1511f8eb95afb5b4610b8fbdacc8b174b6b08530..fc6e3551b7002634bcf6a154080a142dfe32c890 100644
> --- a/drivers/hwtracing/coresight/coresight-trbe.c
> +++ b/drivers/hwtracing/coresight/coresight-trbe.c
> @@ -1289,6 +1289,7 @@ static void arm_trbe_register_coresight_cpu(struct trbe_drvdata *drvdata, int cp
> desc.ops = &arm_trbe_cs_ops;
> desc.groups = arm_trbe_groups;
> desc.dev = dev;
> + desc.cpu = cpu;
> trbe_csdev = coresight_register(&desc);
> if (IS_ERR(trbe_csdev))
> goto cpu_clear;
> diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c b/drivers/hwtracing/coresight/ultrasoc-smb.c
> index 5776f63468fa05df255d3dd716f621c37424c048..5217a9930e2632a40ba0523438052872cea62aea 100644
> --- a/drivers/hwtracing/coresight/ultrasoc-smb.c
> +++ b/drivers/hwtracing/coresight/ultrasoc-smb.c
> @@ -482,6 +482,7 @@ static int smb_register_sink(struct platform_device *pdev,
> return -ENOMEM;
> }
> desc.access = CSDEV_ACCESS_IOMEM(drvdata->base);
> + desc.cpu = -1;
>
> drvdata->csdev = coresight_register(&desc);
> if (IS_ERR(drvdata->csdev))
> diff --git a/include/linux/coresight.h b/include/linux/coresight.h
> index 2131febebee93d609df1aea8534a10898b600be2..6810acc8533e0eb0c5d41a7fbe0bbd03eb94057d 100644
> --- a/include/linux/coresight.h
> +++ b/include/linux/coresight.h
> @@ -153,6 +153,7 @@ struct csdev_access {
> * in the component's sysfs sub-directory.
> * @name: name for the coresight device, also shown under sysfs.
> * @access: Describe access to the device
> + * @cpu: The CPU this component is affined to (-1 for not CPU bound).
> */
> struct coresight_desc {
> enum coresight_dev_type type;
> @@ -163,6 +164,7 @@ struct coresight_desc {
> const struct attribute_group **groups;
> const char *name;
> struct csdev_access access;
> + int cpu;
> };
>
> /**
> @@ -261,6 +263,7 @@ struct coresight_trace_id_map {
> * CS_MODE_SYSFS. Otherwise it must be accessed from inside the
> * spinlock.
> * @orphan: true if the component has connections that haven't been linked.
> + * @cpu: The CPU this component is affined to (-1 for not CPU bound).
> * @sysfs_sink_activated: 'true' when a sink has been selected for use via sysfs
> * by writing a 1 to the 'enable_sink' file. A sink can be
> * activated but not yet enabled. Enabling for a _sink_ happens
> @@ -287,6 +290,7 @@ struct coresight_device {
> atomic_t mode;
> int refcnt;
> bool orphan;
> + int cpu;
> /* sink specific fields */
> bool sysfs_sink_activated;
> struct dev_ext_attribute *ea;
>
next prev parent reply other threads:[~2026-03-13 11:04 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-05 10:17 [PATCH v6 00/19] CoreSight: Refactor power management for CoreSight path Leo Yan
2026-03-05 10:17 ` [PATCH v6 01/19] coresight: sysfs: Validate CPU online status for per-CPU sources Leo Yan
2026-03-13 11:03 ` Suzuki K Poulose [this message]
2026-03-16 14:02 ` Leo Yan
2026-03-16 14:28 ` Suzuki K Poulose
2026-03-16 14:40 ` Leo Yan
2026-03-05 10:17 ` [PATCH v6 02/19] coresight: Set per-CPU source pointer Leo Yan
2026-03-13 11:18 ` Suzuki K Poulose
2026-03-16 14:38 ` Leo Yan
2026-03-16 17:49 ` Suzuki K Poulose
2026-03-16 19:30 ` Leo Yan
2026-03-13 11:22 ` Suzuki K Poulose
2026-03-16 17:41 ` Leo Yan
2026-03-05 10:17 ` [PATCH v6 03/19] coresight: Register CPU PM notifier in core layer Leo Yan
2026-03-05 10:17 ` [PATCH v6 04/19] coresight: etm4x: Hook CPU PM callbacks Leo Yan
2026-03-05 10:17 ` [PATCH v6 05/19] coresight: Add callback to determine if PM is needed Leo Yan
2026-03-13 11:26 ` Suzuki K Poulose
2026-03-17 11:22 ` Leo Yan
2026-03-05 10:17 ` [PATCH v6 06/19] coresight: etm4x: Remove redundant condition checks in save and restore Leo Yan
2026-03-05 10:17 ` [PATCH v6 07/19] coresight: syscfg: Use spinlock to protect active variables Leo Yan
2026-03-05 10:17 ` [PATCH v6 08/19] coresight: Introduce coresight_enable_source() helper Leo Yan
2026-03-13 11:31 ` Suzuki K Poulose
2026-03-05 10:17 ` [PATCH v6 09/19] coresight: Save active path for system tracers Leo Yan
2026-03-05 10:17 ` [PATCH v6 10/19] coresight: etm4x: Set active path on target CPU Leo Yan
2026-03-05 10:17 ` [PATCH v6 11/19] coresight: etm3x: " Leo Yan
2026-03-05 10:17 ` [PATCH v6 12/19] coresight: sysfs: Use source's path pointer for path control Leo Yan
2026-03-05 10:17 ` [PATCH v6 13/19] coresight: Add 'in_idle' argument to path Leo Yan
2026-03-13 14:37 ` Suzuki K Poulose
2026-03-05 10:17 ` [PATCH v6 14/19] coresight: Control path during CPU idle Leo Yan
2026-03-05 10:17 ` [PATCH v6 15/19] coresight: Add PM callbacks for sink device Leo Yan
2026-03-05 10:17 ` [PATCH v6 16/19] coresight: trbe: Save and restore state across CPU low power state Leo Yan
2026-03-05 10:17 ` [PATCH v6 17/19] coresight: sysfs: Increment refcount only for system tracers Leo Yan
2026-03-05 10:17 ` [PATCH v6 18/19] coresight: Take hotplug lock in enable_source_store() for Sysfs mode Leo Yan
2026-03-05 10:17 ` [PATCH v6 19/19] coresight: Move CPU hotplug callbacks to core layer Leo Yan
2026-03-06 9:53 ` [PATCH v6 00/19] CoreSight: Refactor power management for CoreSight path Yeoreum Yun
2026-03-16 16:08 ` James Clark
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