From nobody Wed Apr 8 06:23:51 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0C1FC32772 for ; Tue, 23 Aug 2022 18:03:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233399AbiHWSDA (ORCPT ); Tue, 23 Aug 2022 14:03:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55108 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231183AbiHWSBE (ORCPT ); Tue, 23 Aug 2022 14:01:04 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 12250DCFE8; Tue, 23 Aug 2022 09:07:13 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 876A21424; Tue, 23 Aug 2022 09:07:16 -0700 (PDT) Received: from e121896.arm.com (unknown [10.57.14.228]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id B00BE3F718; Tue, 23 Aug 2022 09:07:10 -0700 (PDT) From: James Clark To: suzuki.poulose@arm.com, coresight@lists.linaro.org, mathieu.poirier@linaro.org Cc: mike.leach@linaro.org, leo.yan@linaro.org, linux-kernel@vger.kernel.org, german.gomez@arm.com, James Clark , Jonathan Corbet , Catalin Marinas , Will Deacon , Alexander Shishkin , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org Subject: [PATCH v3 2/2] coresight: etm4x: docs: Add documentation for 'ts_source' sysfs interface Date: Tue, 23 Aug 2022 17:06:50 +0100 Message-Id: <20220823160650.455823-3-james.clark@arm.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20220823160650.455823-1-james.clark@arm.com> References: <20220823160650.455823-1-james.clark@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: German Gomez Sync sysfs documentation pages to include the new ts_source (timestamp source) interface. Signed-off-by: German Gomez Signed-off-by: James Clark --- .../ABI/testing/sysfs-bus-coresight-devices-etm4x | 8 ++++++++ .../trace/coresight/coresight-etm4x-reference.rst | 14 ++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x b/= Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x index 8e53a32f8150..08b1964f27d3 100644 --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x @@ -516,3 +516,11 @@ Contact: Mathieu Poirier Description: (Read) Returns the number of special conditional P1 right-han= d keys that the trace unit can use (0x194). The value is taken directly from the HW. + +What: /sys/bus/coresight/devices/etm/ts_source +Date: October 2022 +KernelVersion: 6.1 +Contact: Mathieu Poirier or Suzuki K Poulose = +Description: (Read) When FEAT_TRF is implemented, value of TRFCR_ELx.TS us= ed for + trace session. Otherwise -1 indicates an unknown time source. Check + trcidr0.tssize to see if a global timestamp is available. diff --git a/Documentation/trace/coresight/coresight-etm4x-reference.rst b/= Documentation/trace/coresight/coresight-etm4x-reference.rst index fb7578fd9372..70e34b8c81c1 100644 --- a/Documentation/trace/coresight/coresight-etm4x-reference.rst +++ b/Documentation/trace/coresight/coresight-etm4x-reference.rst @@ -71,6 +71,20 @@ =20 ---- =20 +:File: ``ts_source`` (ro) +:Trace Registers: None. +:Notes: + When FEAT_TRF is implemented, value of TRFCR_ELx.TS used for trace ses= sion. Otherwise -1 + indicates an unknown time source. Check trcidr0.tssize to see if a glo= bal timestamp is + available. + +:Example: + ``$> cat ts_source`` + + ``$> 1`` + +---- + :File: ``addr_idx`` (rw) :Trace Registers: None. :Notes: --=20 2.28.0