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Mon, 12 Aug 2024 04:29:05 GMT Received: from jiegan-gv.qualcomm.com (10.80.80.8) by nalasex01c.na.qualcomm.com (10.47.97.35) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Sun, 11 Aug 2024 21:29:01 -0700 From: Jie Gan To: Suzuki K Poulose , Alexander Shishkin , Mike Leach CC: Jinlong Mao , , , , Tingwei Zhang , Yuanfang Zhang , Tao Zhang , Trilok Soni , Song Chai , Subject: [PATCH v1 RESEND] Coresight: Set correct cs_mode for dummy source to fix disable issue Date: Mon, 12 Aug 2024 12:28:44 +0800 Message-ID: <20240812042844.2890115-1-quic_jiegan@quicinc.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01c.na.qualcomm.com (10.47.97.35) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: uIxFwSbxAE1rUL_PdyCLOA8U3Lkluy0P X-Proofpoint-GUID: uIxFwSbxAE1rUL_PdyCLOA8U3Lkluy0P 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=2024-08-11_25,2024-08-07_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 impostorscore=0 adultscore=0 phishscore=0 suspectscore=0 mlxscore=0 mlxlogscore=999 malwarescore=0 bulkscore=0 priorityscore=1501 clxscore=1015 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2408120032 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240811_212913_241358_EADF6C0D X-CRM114-Status: GOOD ( 13.70 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The coresight_disable_source_sysfs function should verify the mode of the coresight device before disabling the source. However, the mode for the dummy source device is always set to CS_MODE_DISABLED, resulting in the check consistently failing. As a result, dummy source cannot be properly disabled. Configure CS_MODE_SYSFS/CS_MODE_PERF during the enablement. Configure CS_MODE_DISABLED during the disablement. Fixes: 9d3ba0b6c056 ("Coresight: Add coresight dummy driver") Signed-off-by: Jie Gan --- drivers/hwtracing/coresight/coresight-dummy.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-dummy.c b/drivers/hwtracing/coresight/coresight-dummy.c index ac70c0b491be..dab389a5507c 100644 --- a/drivers/hwtracing/coresight/coresight-dummy.c +++ b/drivers/hwtracing/coresight/coresight-dummy.c @@ -23,6 +23,9 @@ DEFINE_CORESIGHT_DEVLIST(sink_devs, "dummy_sink"); static int dummy_source_enable(struct coresight_device *csdev, struct perf_event *event, enum cs_mode mode) { + if (!coresight_take_mode(csdev, mode)) + return -EBUSY; + dev_dbg(csdev->dev.parent, "Dummy source enabled\n"); return 0; @@ -31,6 +34,7 @@ static int dummy_source_enable(struct coresight_device *csdev, static void dummy_source_disable(struct coresight_device *csdev, struct perf_event *event) { + coresight_set_mode(csdev, CS_MODE_DISABLED); dev_dbg(csdev->dev.parent, "Dummy source disabled\n"); }