From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: Anshuman Khandual <anshuman.khandual@arm.com>,
linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org
Cc: linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org,
mike.leach@linaro.org
Subject: Re: [RFC 10/11] coresgith: etm-perf: Connect TRBE sink with ETE source
Date: Thu, 12 Nov 2020 09:31:17 +0000 [thread overview]
Message-ID: <d409acab-f811-45f7-b00f-cd2f281d6112@arm.com> (raw)
In-Reply-To: <1605012309-24812-11-git-send-email-anshuman.khandual@arm.com>
Hi Anshuman,
On 11/10/20 12:45 PM, Anshuman Khandual wrote:
> Unlike traditional sink devices, individual TRBE instances are not detected
> via DT or ACPI nodes. Instead TRBE instances are detected during CPU online
> process. Hence a path connecting ETE and TRBE on a given CPU would not have
> been established until then. This adds two coresight helpers that will help
> modify outward connections from a source device to establish and terminate
> path to a given sink device. But this method might not be optimal and would
> be reworked later.
>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Instead of this, could we come up something like a percpu_sink concept ? That
way, the TRBE driver could register the percpu_sink for the corresponding CPU
and we don't have to worry about the order in which the ETE will be probed
on a hotplugged CPU. (i.e, if the TRBE is probed before the ETE, the following
approach would fail to register the sink).
And the default sink can be initialized when the ETE instance first starts
looking for it.
Suzuki
next prev parent reply other threads:[~2020-11-12 9:31 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-10 12:44 [RFC 00/11] arm64: coresight: Enable ETE and TRBE Anshuman Khandual
2020-11-10 12:44 ` [RFC 01/11] arm64: Add TRBE definitions Anshuman Khandual
2020-11-10 12:45 ` [RFC 02/11] coresight: etm-perf: Allow an event to use different sinks Anshuman Khandual
2020-11-12 9:21 ` Suzuki K Poulose
2020-11-12 10:37 ` Linu Cherian
2020-11-12 11:09 ` Suzuki K Poulose
2020-11-10 12:45 ` [RFC 03/11] coresight: Do not scan for graph if none is present Anshuman Khandual
2020-11-10 12:45 ` [RFC 04/11] coresight: etm4x: Add support for PE OS lock Anshuman Khandual
2020-11-10 12:45 ` [RFC 05/11] coresight: ete: Add support for sysreg support Anshuman Khandual
2020-11-10 12:45 ` [RFC 06/11] coresight: ete: Detect ETE as one of the supported ETMs Anshuman Khandual
2020-11-14 5:36 ` Tingwei Zhang
2020-11-23 9:56 ` Suzuki K Poulose
2020-11-10 12:45 ` [RFC 07/11] coresight: sink: Add TRBE driver Anshuman Khandual
2020-11-12 10:13 ` Suzuki K Poulose
2020-11-25 5:25 ` Anshuman Khandual
2020-11-14 5:38 ` Tingwei Zhang
2020-11-23 3:51 ` Anshuman Khandual
2020-11-10 12:45 ` [RFC 08/11] coresight: etm-perf: Truncate the perf record if handle has no space Anshuman Khandual
2020-11-10 12:45 ` [RFC 09/11] coresight: etm-perf: Disable the path before capturing the trace data Anshuman Khandual
2020-11-12 9:27 ` Suzuki K Poulose
2020-11-23 6:08 ` Anshuman Khandual
2020-11-23 10:01 ` Suzuki K Poulose
2020-11-27 10:32 ` Suzuki K Poulose
2020-12-11 20:31 ` Mathieu Poirier
2020-12-14 10:00 ` Suzuki K Poulose
2020-11-10 12:45 ` [RFC 10/11] coresgith: etm-perf: Connect TRBE sink with ETE source Anshuman Khandual
2020-11-12 9:31 ` Suzuki K Poulose [this message]
2020-11-23 5:37 ` Anshuman Khandual
2020-12-11 21:31 ` Mathieu Poirier
2020-11-10 12:45 ` [RFC 11/11] dts: bindings: Document device tree binding for Arm TRBE Anshuman Khandual
2020-11-10 18:25 ` [RFC 00/11] arm64: coresight: Enable ETE and TRBE Mathieu Poirier
2020-11-14 5:17 ` Tingwei Zhang
2020-11-16 15:00 ` Mike Leach
2020-11-23 3:40 ` Anshuman Khandual
2020-11-23 12:30 ` Mike Leach
2020-11-23 2:43 ` Anshuman Khandual
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