From nobody Thu Dec 18 20:20:08 2025 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (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 7B93D1547CA for ; Wed, 4 Dec 2024 10:13:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733307230; cv=none; b=CpNTKQBxDB0rCZArOKxj9MA7xZyA9VYhCu4pQVuGo5JENnJSgiAePjc3y3oyNGgTpMPvL1rcvQawryuUSPMZyVla+bhxRcYJhUpQKsG/Y2Z6G5pFjmRmSkmjeSjYz1E3Ke05SbO24FUqlIu7h+RbgY2FtMJblLkXOZcgfAWvMjY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733307230; c=relaxed/simple; bh=sY7ft/r9179etqUvKhWFEw3jLNaW0Xu3slTBlebIeNM=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=MHORidPoNNVBUESVCUrqduHBHuVapi0hOhVBHO6T3olqhVEBgll9PZemcCgG/81taBnm3DET9xrHiuS4VZ2I6QAfpVuJy9nytln/07TMK4Mj5ZuZwTsFKuYgmPOChWiKtuz1lniADuCG0pEwrfG3OXvDcRW6o2R0VyTscwlGJQQ= 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=Wj95f/Ny; arc=none smtp.client-ip=205.220.168.131 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="Wj95f/Ny" Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4B45ouxi027841; Wed, 4 Dec 2024 10:13:39 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to; s=qcppdkim1; bh=mRUdBUrvOR5OMLLhJd0Bls d5j07lMOMnM9Fsmzdm5jQ=; b=Wj95f/NyHX6plyu4Tt2TtA0p8IbNBipW82gtwI H5Bu/j9x2Bfm4dK+NXATqNq8zNVwd1ZjfJsr9lBabO8JcqVgn7YN9CiM+v9qtprn 6W/+1TPSAG36mBn3r7FJd6eeavSPW3+r3+9qgGt0jD8uLSFbW0Xpp1AFVOn/KDCG Lqh85pnv+OV0ogK6yhKUFCD/gk+of9nCCy6vNYhnAmzhwnZLAJjz7LI8sYWRJZyW 4gx6vGRf6gH7Ii0I/wRkPjfQu7UGQuIIgpNrT/+2twukBillvW0Jyc3kczcSiXUM RrZcVxRV/UEVtn4PWsdAMdlVWqtA2tfwQSu7ATsaDpp5DcFQ== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 439vcem0eq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 04 Dec 2024 10:13:39 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA01.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 4B4ADc1O018701 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 4 Dec 2024 10:13:38 GMT Received: from yuanfang4-gv.qualcomm.com (10.80.80.8) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Wed, 4 Dec 2024 02:13:36 -0800 From: yuanfang zhang To: , , , CC: , , Subject: [PATCH] coresight-etm4x: add isb() before reading the TRCSTATR Date: Wed, 4 Dec 2024 18:13:20 +0800 Message-ID: <20241204101320.3692167-1-quic_yuanfang@quicinc.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: F0QmzLYZNmO_MEcX7yaJ7-GrgTerG-RR X-Proofpoint-ORIG-GUID: F0QmzLYZNmO_MEcX7yaJ7-GrgTerG-RR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 mlxlogscore=999 adultscore=0 suspectscore=0 spamscore=0 impostorscore=0 phishscore=0 mlxscore=0 malwarescore=0 clxscore=1011 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412040079 Content-Type: text/plain; charset="utf-8" From: Yuanfang Zhang As recommended by section 4.3.7 ("Synchronization when using system instructions to progrom the trace unit") of ARM IHI 0064H.b, the self-hosted trace analyzer must perform a Context synchronization event between writing to the TRCPRGCTLR and reading the TRCSTATR. Signed-off-by: Yuanfang Zhang --- drivers/hwtracing/coresight/coresight-etm4x-core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/h= wtracing/coresight/coresight-etm4x-core.c index 66d44a404ad0..5da2c523c30a 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -906,6 +906,7 @@ static void etm4_disable_hw(void *info) tsb_csync(); etm4x_relaxed_write32(csa, control, TRCPRGCTLR); =20 + isb(); /* wait for TRCSTATR.PMSTABLE to go to '1' */ if (coresight_timeout(csa, TRCSTATR, TRCSTATR_PMSTABLE_BIT, 1)) dev_err(etm_dev, --=20 2.34.1