From patchwork Mon Jul 29 07:14:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mao Jinlong X-Patchwork-Id: 13744458 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1C59D823DD; Mon, 29 Jul 2024 07:14:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722237295; cv=none; b=AZ9JVWRWtjP4hSikDj2py7FzhPSFb2zPFq5u0WpPE2C3OFMcI59dY5O3W9vkkWaVfMhgktZzds/xTErzmPUz+fOxRA9r9aihcehyM+j+qKfQ7KiE149/fipwakUolvBbBvrOZqtllAgGjMG4Ln0n2qvWSxNABXftAHwoA5sRVX4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722237295; c=relaxed/simple; bh=RdfTI2KZiM+vkRQIifXgBsd8PwGWSic2FxFTsUrP5CY=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=YBselkFCDx/cIy3CzVxQzxqHqORJjyhbQ+lYtkPLuhYj+XgzwK4Xlr/orQyuLL6shyyt5XjGmMfWLozpezXbwNkYAcue01DU1JBvMptYKPOmEamTokLoEC8BTgKWALN5Cs5XiMusE8exdQ0HIv9b+lH+opTxqxE4LyuyG0aMp+s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=IwUJuHBx; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="IwUJuHBx" Received: from pps.filterd (m0279869.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 46T0Dav7008728; Mon, 29 Jul 2024 07:14:28 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= yuE6lHQaiymgzezeg/JMUuNCBfhrSeNRdvstmcxrGy8=; b=IwUJuHBxdSi3SgR0 b6nJaHkJmB3rTFuthmr2Q/6TfmO84d0GRO/6wuDrw2sBypgr8VtdEDi2ZFgwipr+ g90KbrhtfFGnmfSuRFyxemBWCuuE0ftd4HbioLy1c/W2UsBACIet+h7ZjQkXzQOt Qkl1tLZUAiVgFV2TjdTS00YjWJ/fHM0f5XfBx67EXwrjnDNHjcbq3zztj3ZfvTcY pJROsEBiOCTBz6HWUNIrxEP5dQaFO3iAzXaN6r8Un8v3pJ3ozzHd+5DxxFBU1ZLQ cp2x721B9lRkBK/3N5oGRG/r1CbuY4ljyCZ2x86fizGcoe7E7674dCm3lpsziMw3 ROW7IQ== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 40mqw73buf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 29 Jul 2024 07:14:27 +0000 (GMT) Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA05.qualcomm.com (8.17.1.19/8.17.1.19) with ESMTPS id 46T7EQUX008085 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 29 Jul 2024 07:14:26 GMT Received: from hu-jinlmao-lv.qualcomm.com (10.49.16.6) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 29 Jul 2024 00:14:26 -0700 From: Mao Jinlong To: Suzuki K Poulose , Mike Leach , James Clark , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Mao Jinlong , "Alexander Shishkin" CC: , , , , Subject: [PATCH v4 3/3] coresight: dummy: Add static trace id support for dummy source Date: Mon, 29 Jul 2024 00:14:11 -0700 Message-ID: <20240729071414.5410-4-quic_jinlmao@quicinc.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20240729071414.5410-1-quic_jinlmao@quicinc.com> References: <20240729071414.5410-1-quic_jinlmao@quicinc.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: Oy02sxsnzyeXip9V_D0R0NmyAwzVHNN8 X-Proofpoint-GUID: Oy02sxsnzyeXip9V_D0R0NmyAwzVHNN8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-29_05,2024-07-26_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxlogscore=999 spamscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 adultscore=0 suspectscore=0 malwarescore=0 phishscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2407290048 Some dummy source has static trace id configured in HW and it cannot be changed via software programming. Configure the trace id in device tree and reserve the id when device probe. Signed-off-by: Mao Jinlong --- .../sysfs-bus-coresight-devices-dummy-source | 15 +++++ drivers/hwtracing/coresight/coresight-dummy.c | 59 +++++++++++++++++-- 2 files changed, 70 insertions(+), 4 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source b/Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source new file mode 100644 index 000000000000..db770bc972d9 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-dummy-source @@ -0,0 +1,15 @@ +What: /sys/bus/coresight/devices/dummy_source/enable_source +Date: July 2024 +KernelVersion: 6.9 +Contact: Mao Jinlong +Description: (RW) Enable/disable tracing of dummy source. A sink should be activated + before enabling the source. The path of coresight components linking + the source to the sink is configured and managed automatically by the + coresight framework. + +What: /sys/bus/coresight/devices/dummy_source/traceid +Date: July 2024 +KernelVersion: 6.9 +Contact: Mao Jinlong +Description: (R) Show the trace ID that will appear in the trace stream + coming from this trace entity. diff --git a/drivers/hwtracing/coresight/coresight-dummy.c b/drivers/hwtracing/coresight/coresight-dummy.c index ac70c0b491be..3bf5437cbfb1 100644 --- a/drivers/hwtracing/coresight/coresight-dummy.c +++ b/drivers/hwtracing/coresight/coresight-dummy.c @@ -11,10 +11,12 @@ #include #include "coresight-priv.h" +#include "coresight-trace-id.h" struct dummy_drvdata { struct device *dev; struct coresight_device *csdev; + u8 traceid; }; DEFINE_CORESIGHT_DEVLIST(source_devs, "dummy_source"); @@ -67,6 +69,32 @@ static const struct coresight_ops dummy_sink_cs_ops = { .sink_ops = &dummy_sink_ops, }; +/* User can get the trace id of dummy source from this node. */ +static ssize_t traceid_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + unsigned long val; + struct dummy_drvdata *drvdata = dev_get_drvdata(dev->parent); + + val = drvdata->traceid; + return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); +} +static DEVICE_ATTR_RO(traceid); + +static struct attribute *coresight_dummy_attrs[] = { + &dev_attr_traceid.attr, + NULL, +}; + +static const struct attribute_group coresight_dummy_group = { + .attrs = coresight_dummy_attrs, +}; + +static const struct attribute_group *coresight_dummy_groups[] = { + &coresight_dummy_group, + NULL, +}; + static int dummy_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -74,6 +102,11 @@ static int dummy_probe(struct platform_device *pdev) struct coresight_platform_data *pdata; struct dummy_drvdata *drvdata; struct coresight_desc desc = { 0 }; + int ret, trace_id; + + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; if (of_device_is_compatible(node, "arm,coresight-dummy-source")) { @@ -85,6 +118,25 @@ static int dummy_probe(struct platform_device *pdev) desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS; desc.ops = &dummy_source_cs_ops; + desc.groups = coresight_dummy_groups; + + ret = coresight_get_static_trace_id(dev, &trace_id); + if (!ret) { + /* Get the static id if id is set in device tree. */ + ret = coresight_trace_id_get_static_system_id(trace_id); + if (ret < 0) + return ret; + + } else { + /* Get next available id if id is not set in device tree. */ + trace_id = coresight_trace_id_get_system_id(); + if (trace_id < 0) { + ret = trace_id; + return ret; + } + } + drvdata->traceid = (u8)trace_id; + } else if (of_device_is_compatible(node, "arm,coresight-dummy-sink")) { desc.name = coresight_alloc_device_name(&sink_devs, dev); if (!desc.name) @@ -103,10 +155,6 @@ static int dummy_probe(struct platform_device *pdev) return PTR_ERR(pdata); pdev->dev.platform_data = pdata; - drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); - if (!drvdata) - return -ENOMEM; - drvdata->dev = &pdev->dev; platform_set_drvdata(pdev, drvdata); @@ -126,7 +174,10 @@ static void dummy_remove(struct platform_device *pdev) { struct dummy_drvdata *drvdata = platform_get_drvdata(pdev); struct device *dev = &pdev->dev; + struct device_node *node = dev->of_node; + if (of_device_is_compatible(node, "arm,coresight-dummy-source")) + coresight_trace_id_put_system_id(drvdata->traceid); pm_runtime_disable(dev); coresight_unregister(drvdata->csdev); }