From patchwork Fri Mar 24 06:16:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hao Zhang X-Patchwork-Id: 666616 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 EEAC2C6FD1C for ; Fri, 24 Mar 2023 06:17:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231308AbjCXGRA (ORCPT ); Fri, 24 Mar 2023 02:17:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46246 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231699AbjCXGQz (ORCPT ); Fri, 24 Mar 2023 02:16:55 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DCBF19F16; Thu, 23 Mar 2023 23:16:52 -0700 (PDT) Received: from pps.filterd (m0279866.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 32O3V5sP031552; Fri, 24 Mar 2023 06:16:37 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=XmY9HOSG6epo6mFJPOCNZOEe25sE7IFp6wh19+RhQ0Y=; b=Cpsce67872scjFjYr17ZOlZ2PXKWvFwCGjF5NOlFgdET3Id02nXAB7i1EUrApPKtPq0A oN2nD8Dm7uFOlshgsyddM8Vc82Wpi7OYUnHfwg2+8B/+zYT80W/rS1sd/LRotFjrEGKV LP01bUEOLxKftWk/6+jFlIN/zrjzRBXSma9Swd4zIJ/jBzQO4rt8fZMGRRtMGSSu0hdC 1h+p+bbU65YhbOt2g4Zi/JWdD7WtGFO0dPrpl8YkjM3NMekC2HocDe9cAneoHZjJZm5Z ezUG9kRu0/kIvuSqXEEHx2/djEezMtnoxC2e0eSGfFgwtMm+ofMM1cC1G1V56+8VynyE mw== Received: from nasanppmta02.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3pgyee8uk7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 24 Mar 2023 06:16:37 +0000 Received: from nasanex01a.na.qualcomm.com (nasanex01a.na.qualcomm.com [10.52.223.231]) by NASANPPMTA02.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 32O6Ga7Y014263 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 24 Mar 2023 06:16:36 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 23:16:31 -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 1/3] Coresight: Add coresight dummy driver Date: Fri, 24 Mar 2023 14:16:06 +0800 Message-ID: <20230324061608.33609-2-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-GUID: YuIr9MOiJgHsYjhzYgX6WGCpfP6V6nJ2 X-Proofpoint-ORIG-GUID: YuIr9MOiJgHsYjhzYgX6WGCpfP6V6nJ2 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 adultscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 mlxlogscore=999 malwarescore=0 phishscore=0 priorityscore=1501 mlxscore=0 bulkscore=0 impostorscore=0 spamscore=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 Some Coresight 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. Signed-off-by: Hao Zhang --- drivers/hwtracing/coresight/Kconfig | 11 ++ drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-dummy.c | 176 ++++++++++++++++++ 3 files changed, 188 insertions(+) create mode 100644 drivers/hwtracing/coresight/coresight-dummy.c diff --git a/drivers/hwtracing/coresight/Kconfig b/drivers/hwtracing/coresight/Kconfig index 2b5bbfffbc4f..06f0a7594169 100644 --- a/drivers/hwtracing/coresight/Kconfig +++ b/drivers/hwtracing/coresight/Kconfig @@ -236,4 +236,15 @@ config CORESIGHT_TPDA To compile this driver as a module, choose M here: the module will be called coresight-tpda. + +config CORESIGHT_DUMMY + tristate "Dummy driver support" + help + Enables support for dummy driver. Dummy driver can be used for + CoreSight sources/sinks that are owned and configured by some + other subsystem and use Linux drivers to configure rest of trace + path. + + To compile this driver as a module, choose M here: the module will be + called coresight-dummy. endif diff --git a/drivers/hwtracing/coresight/Makefile b/drivers/hwtracing/coresight/Makefile index 33bcc3f7b8ae..995d3b2c76df 100644 --- a/drivers/hwtracing/coresight/Makefile +++ b/drivers/hwtracing/coresight/Makefile @@ -30,3 +30,4 @@ obj-$(CONFIG_CORESIGHT_TPDA) += coresight-tpda.o coresight-cti-y := coresight-cti-core.o coresight-cti-platform.o \ coresight-cti-sysfs.o obj-$(CONFIG_ULTRASOC_SMB) += ultrasoc-smb.o +obj-$(CONFIG_CORESIGHT_DUMMY) += coresight-dummy.o diff --git a/drivers/hwtracing/coresight/coresight-dummy.c b/drivers/hwtracing/coresight/coresight-dummy.c new file mode 100644 index 000000000000..2d4eb3e546eb --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-dummy.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include + +#include "coresight-priv.h" +#include "coresight-trace-id.h" + +struct dummy_drvdata { + struct device *dev; + struct coresight_device *csdev; + int traceid; +}; + +DEFINE_CORESIGHT_DEVLIST(dummy_devs, "dummy"); + +static int dummy_source_enable(struct coresight_device *csdev, + struct perf_event *event, u32 mode) +{ + struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + dev_info(drvdata->dev, "Dummy source enabled\n"); + + return 0; +} + +static void dummy_source_disable(struct coresight_device *csdev, + struct perf_event *event) +{ + struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + dev_info(drvdata->dev, "Dummy source disabled\n"); +} + +static int dummy_sink_enable(struct coresight_device *csdev, u32 mode, + void *data) +{ + struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + dev_info(drvdata->dev, "Dummy sink enabled\n"); + + return 0; +} + +static int dummy_sink_disable(struct coresight_device *csdev) +{ + struct dummy_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + dev_info(drvdata->dev, "Dummy sink disabled\n"); + + return 0; +} + +static const struct coresight_ops_source dummy_source_ops = { + .enable = dummy_source_enable, + .disable = dummy_source_disable, +}; + +static const struct coresight_ops_sink dummy_sink_ops = { + .enable = dummy_sink_enable, + .disable = dummy_sink_disable, +}; + +static const struct coresight_ops dummy_cs_ops = { + .source_ops = &dummy_source_ops, + .sink_ops = &dummy_sink_ops, +}; + +static int dummy_probe(struct platform_device *pdev) +{ + int ret, trace_id; + struct device *dev = &pdev->dev; + struct coresight_platform_data *pdata; + struct dummy_drvdata *drvdata; + struct coresight_desc desc = { 0 }; + + desc.name = coresight_alloc_device_name(&dummy_devs, dev); + if (!desc.name) + return -ENOMEM; + + pdata = coresight_get_platform_data(dev); + if (IS_ERR(pdata)) + 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); + + if (of_property_read_bool(pdev->dev.of_node, "qcom,dummy-source")) { + desc.type = CORESIGHT_DEV_TYPE_SOURCE; + desc.subtype.source_subtype = + CORESIGHT_DEV_SUBTYPE_SOURCE_OTHERS; + } else if (of_property_read_bool(pdev->dev.of_node, + "qcom,dummy-sink")) { + desc.type = CORESIGHT_DEV_TYPE_SINK; + desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER; + } else { + dev_info(dev, "Device type not set\n"); + return -EINVAL; + } + + desc.ops = &dummy_cs_ops; + desc.pdata = pdev->dev.platform_data; + desc.dev = &pdev->dev; + drvdata->csdev = coresight_register(&desc); + if (IS_ERR(drvdata->csdev)) + return PTR_ERR(drvdata->csdev); + + trace_id = coresight_trace_id_get_system_id(); + if (trace_id < 0) { + ret = trace_id; + goto cs_unregister; + } + drvdata->traceid = (u8)trace_id; + + pm_runtime_enable(dev); + dev_info(dev, "Dummy device initialized\n"); + + return 0; + +cs_unregister: + coresight_unregister(drvdata->csdev); + + return ret; +} + +static int dummy_remove(struct platform_device *pdev) +{ + struct dummy_drvdata *drvdata = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + + coresight_trace_id_put_system_id(drvdata->traceid); + pm_runtime_disable(dev); + coresight_unregister(drvdata->csdev); + return 0; +} + +static const struct of_device_id dummy_match[] = { + {.compatible = "qcom,coresight-dummy"}, + {}, +}; + +static struct platform_driver dummy_driver = { + .probe = dummy_probe, + .remove = dummy_remove, + .driver = { + .name = "coresight-dummy", + .of_match_table = dummy_match, + }, +}; + +static int __init dummy_init(void) +{ + return platform_driver_register(&dummy_driver); +} +module_init(dummy_init); + +static void __exit dummy_exit(void) +{ + platform_driver_unregister(&dummy_driver); +} +module_exit(dummy_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("CoreSight dummy source driver");