From patchwork Mon Jul 8 15:53:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mukesh Ojha X-Patchwork-Id: 13726780 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 9AF7714EC62; Mon, 8 Jul 2024 15:54:03 +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=1720454045; cv=none; b=HW24p5qnxsBi2aoXPt9Fcqug2+KBZ0kYjxCMgsP1R5Mrrfg/P+oTrvV6COezu89CA8dMP8mv9KJqLAh94+ZqmFoLoxwru+bLP8Sc4TFmRof48YW08USOMrtJ5LoasPK519pPwkG6cA++DJ5kpHQfa8o0m1/CiZIld2N+mnKU9Vw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720454045; c=relaxed/simple; bh=Jv9Osj1MkLpJnopOQ2p6sePdzmKda/4nq+wQ2oK8DOM=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=rK7FU4gg0Fkn+Cq7QHTBW/rNNrz1AwkTWigXVTe5i9l3LNN/+Ihn6roB4Y8/+SMlOsKIXcrqUqHMom0H0LzW4StZEuWrlFfGGhgpgt/BO7myg0vIsB4PmUGPUrluRyDnMbIiL/xQucRb7jVpTeWUqBoLPY3gJcEQsUmIjudx8n0= 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=Zr4xsfIn; 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="Zr4xsfIn" Received: from pps.filterd (m0279862.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 468Bi7s4031378; Mon, 8 Jul 2024 15:53:59 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=Ry4a33oM2h+smvuuo7xpH1 VE6ViBwP9kkXd/cgX2QYI=; b=Zr4xsfIngMqSR3qf5curMx6x88rsFEMvSWLbok m8PzMws9NoUELMigsbSnfkAQgPp/6ba/QPp51hq66sHCJ50CLHeiwkp8vk+BxM9+ l1fvOFniZtcenqi3QVM4xTDyrPHkNThFuUj4kbDZUEJq4LZezUDa53ePoU89CWED yGiybw1bFAsxqIuhHWwcJ6PWiqlB95QnNdo3bArTRm2Gwz6j0+UpD3M9WQcZXGJF 4IibW1FXtIwvx28c8dSXfAFhQ2+dDbVyMVxtk4MTsTT9LaXe9EJOeS0aZdUoGbkx hTIKKVFyjug+1Mk6SlL9NBMvmKsQpzYvxKkyThHeWB26xnwQ== Received: from nasanppmta02.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 406xpdkxd8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 08 Jul 2024 15:53:59 +0000 (GMT) Received: from nasanex01c.na.qualcomm.com (nasanex01c.na.qualcomm.com [10.45.79.139]) by NASANPPMTA02.qualcomm.com (8.17.1.19/8.17.1.19) with ESMTPS id 468FrwYV024988 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 8 Jul 2024 15:53:58 GMT Received: from hu-mojha-hyd.qualcomm.com (10.80.80.8) by nasanex01c.na.qualcomm.com (10.45.79.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 8 Jul 2024 08:53:56 -0700 From: Mukesh Ojha To: , , CC: , , Mukesh Ojha Subject: [PATCH v2] firmware: qcom: scm: Disable SDI and write no dump to dump mode Date: Mon, 8 Jul 2024 21:23:32 +0530 Message-ID: <20240708155332.4056479-1-quic_mojha@quicinc.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01c.na.qualcomm.com (10.45.79.139) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: j52KZ0MhL9fhPUEACbJQel7hqdiBPTBn X-Proofpoint-ORIG-GUID: j52KZ0MhL9fhPUEACbJQel7hqdiBPTBn 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=2024-07-08_09,2024-07-05_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 adultscore=0 suspectscore=0 mlxscore=0 mlxlogscore=999 spamscore=0 clxscore=1011 lowpriorityscore=0 priorityscore=1501 malwarescore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2406140001 definitions=main-2407080118 SDI is enabled for most of the Qualcomm SoCs and as per commit ff4aa3bc9825 ("firmware: qcom_scm: disable SDI if required") it was recommended to disable SDI by mentioning it in device tree to avoid hang during watchdog or during reboot. However, for some cases if download mode tcsr register already configured from boot firmware to collect dumps and if SDI is disabled via means of mentioning it in device tree we could still end up with dump collection. Disabling SDI alone is not completely enough to disable dump mode and we also need to zero out the bits download bits from tcsr register. Current commit now, unconditionally call qcom_scm_set_download_mode() based on download_mode flag, at max if TCSR register is not mentioned or available for a SoC it will fallback to legacy way of setting download mode through command which may be no-ops or return error in case current firmware does not implements QCOM_SCM_INFO_IS_CALL_AVAIL so, at worst it does nothing if it fails. It also does to call SDI disable call if dload mode is disabled, which looks fine to do as intention is to disable dump collection even if system crashes. Fixes: ff4aa3bc9825 ("firmware: qcom_scm: disable SDI if required") Signed-off-by: Mukesh Ojha --- Changes in v2: https://lore.kernel.org/lkml/20240705120623.1424931-1-quic_mojha@quicinc.com/ - Modified the commit description to make the problem description more clearer. [eberman] - Added Fixes tag and removed conditional operator from qcom_scm_set_download_mode() argument. [eberman] drivers/firmware/qcom/qcom_scm.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c index 00c379a3cceb..0f5ac346bda4 100644 --- a/drivers/firmware/qcom/qcom_scm.c +++ b/drivers/firmware/qcom/qcom_scm.c @@ -1954,14 +1954,12 @@ static int qcom_scm_probe(struct platform_device *pdev) * will cause the boot stages to enter download mode, unless * disabled below by a clean shutdown/reboot. */ - if (download_mode) - qcom_scm_set_download_mode(true); - + qcom_scm_set_download_mode(download_mode); /* * Disable SDI if indicated by DT that it is enabled by default. */ - if (of_property_read_bool(pdev->dev.of_node, "qcom,sdi-enabled")) + if (of_property_read_bool(pdev->dev.of_node, "qcom,sdi-enabled") || !download_mode) qcom_scm_disable_sdi(); ret = of_reserved_mem_device_init(__scm->dev);