From patchwork Fri Mar 24 06:16:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Zhang X-Patchwork-Id: 666988 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 2B7F3C76196 for ; Fri, 24 Mar 2023 06:17:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231699AbjCXGR3 (ORCPT ); Fri, 24 Mar 2023 02:17:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46710 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229817AbjCXGRX (ORCPT ); Fri, 24 Mar 2023 02:17:23 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 49D6028E76; Thu, 23 Mar 2023 23:17:15 -0700 (PDT) Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 32O5FbJ2030390; Fri, 24 Mar 2023 06:16:50 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=qcppdkim1; bh=XNhxMsKw6ZAe+EYt13fPXlDqqycgBNXXfO0jTrz0x0w=; b=LymwUMow5Jwgr4HR/5eHH+OVNwHFWYtxutNjh4/KbsM4Ny7gVjeScmWgEO57LS47Ec7w 5YApU1Y/pfNfXkB6xuPKu+qwmXQ1rpJHLMbSZiouiuLibsP0RlONIu389m+fVQC8fi44 2mkzSDMLs6X6om6+iMDSgRQl3qdH8f/Rl5rcO6GhCUgQdhinvRFFke/ls1m5SVtxCKQL t2Cbph8CoPiCySPCrklnOOIgbGb0Pc67HZ1XA89UhXW6TRjlZ3SqypwA5M78P5aDhHd3 40gCCKHSj8ExWuGFmmn2rvLs8QspOa4KzjJsHqoK/PHMpRAMYZLI+++zj6Gg1+rQ296/ ig== Received: from nasanppmta04.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3pgydugvyf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 24 Mar 2023 06:16:50 +0000 Received: from nasanex01a.na.qualcomm.com (nasanex01a.na.qualcomm.com [10.52.223.231]) by NASANPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 32O6Gn6B005035 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 24 Mar 2023 06:16:49 GMT Received: from hazha-gv.qualcomm.com (10.80.80.8) by nasanex01a.na.qualcomm.com (10.52.223.231) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.41; Thu, 23 Mar 2023 23:16:43 -0700 From: Hao Zhang To: Mathieu Poirier , Suzuki K Poulose , Alexander Shishkin , Konrad Dybcio , Mike Leach , Rob Herring , Krzysztof Kozlowski , Andy Gross , Paul Walmsley , Palmer Dabbelt , Albert Ou , Jonathan Corbet CC: Hao Zhang , Leo Yan , "Greg Kroah-Hartman" , , , , , Tingwei Zhang , Jinlong Mao , Yuanfang Zhang , Tao Zhang , Trilok Soni , , Bjorn Andersson , Subject: [PATCH v2 3/3] Documentation: trace: Add documentation for Coresight Dummy Trace Date: Fri, 24 Mar 2023 14:16:08 +0800 Message-ID: <20230324061608.33609-4-quic_hazha@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230324061608.33609-1-quic_hazha@quicinc.com> References: <20230324061608.33609-1-quic_hazha@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01a.na.qualcomm.com (10.52.223.231) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: LNGL-8bt0fqzFf7EHFVs3GItCkxhHfeV X-Proofpoint-GUID: LNGL-8bt0fqzFf7EHFVs3GItCkxhHfeV X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-03-24_02,2023-03-23_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 spamscore=0 malwarescore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2303240049 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add documentation for Coresight Dummy Trace under trace/coresight. Signed-off-by: Hao Zhang --- .../trace/coresight/coresight-dummy.rst | 58 +++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 Documentation/trace/coresight/coresight-dummy.rst diff --git a/Documentation/trace/coresight/coresight-dummy.rst b/Documentation/trace/coresight/coresight-dummy.rst new file mode 100644 index 000000000000..819cabab8623 --- /dev/null +++ b/Documentation/trace/coresight/coresight-dummy.rst @@ -0,0 +1,58 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================= +Coresight Dummy Trace Module +============================= + + :Author: Hao Zhang + :Date: March 2023 + +Introduction +--------------------------- + +Coresight Dummy Trace Module is for the specific devices that HLOS don't +have permission to access or configure. Such as Coresight sink EUD, some +TPDMs etc. So there need driver to register dummy devices as Coresight +devices. Provide Coresight API for dummy device operations, such as +enabling and disabling dummy devices. Build the Coresight path for dummy +sink or dummy source for debugging. + +Sysfs files and directories +--------------------------- + +Root: ``/sys/bus/coresight/devices/dummy`` + +---- + +:File: ``enable_source`` (RW) +:Notes: + - > 0 : enable the datasets of dummy source. + + - = 0 : disable the datasets of dummy source. + +:Syntax: + ``echo 1 > enable_source`` + +---- + +:File: ``enable_sink`` (RW) +:Notes: + - > 0 : enable the datasets of dummy sink. + + - = 0 : disable the datasets of dummy sink. + +:Syntax: + ``echo 1 > enable_sink`` + +---- + +Config details +--------------------------- + +There are two types of nodes, dummy sink and dummy source. The nodes +should be observed at the coresight path +"/sys/bus/coresight/devices". +e.g. +/sys/bus/coresight/devices # ls -l | grep dummy +dummy0 -> ../../../devices/platform/soc@0/soc@0:dummy_source/dummy0 +dummy1 -> ../../../devices/platform/soc@0/soc@0:dummy_sink/dummy1