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Suggested-by: Konrad Dybcio Signed-off-by: Sibi Sankar --- v3: * Drop OPP table from the required property list. [Konrad/Krzysztof] .../devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml | 1 - 1 file changed, 1 deletion(-) diff --git a/Documentation/devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml b/Documentation/devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml index 05067e197abe..9c248e1eabe2 100644 --- a/Documentation/devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml +++ b/Documentation/devicetree/bindings/interconnect/qcom,msm8998-bwmon.yaml @@ -72,7 +72,6 @@ required: - interconnects - interrupts - operating-points-v2 - - opp-table - reg additionalProperties: false From patchwork Mon Jun 24 09:22:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sibi Sankar X-Patchwork-Id: 807168 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 812E31304B1; 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Mon, 24 Jun 2024 09:23:05 +0000 (GMT) Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA04.qualcomm.com (8.17.1.19/8.17.1.19) with ESMTPS id 45O9N42I023535 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 24 Jun 2024 09:23:04 GMT Received: from hu-sibis-blr.qualcomm.com (10.80.80.8) 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, 24 Jun 2024 02:22:59 -0700 From: Sibi Sankar To: , , , , , , CC: , , , , , , , , Subject: [PATCH V3 3/4] soc: qcom: icc-bwmon: Allow for interrupts to be shared across instances Date: Mon, 24 Jun 2024 14:52:13 +0530 Message-ID: <20240624092214.146935-4-quic_sibis@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240624092214.146935-1-quic_sibis@quicinc.com> References: <20240624092214.146935-1-quic_sibis@quicinc.com> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) 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: LjVomsMhcbDicQrk_2pM4_klvla9gWVm X-Proofpoint-GUID: LjVomsMhcbDicQrk_2pM4_klvla9gWVm 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=2024-06-24_08,2024-06-21_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 bulkscore=0 phishscore=0 suspectscore=0 lowpriorityscore=0 malwarescore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2406140001 definitions=main-2406240075 The multiple BWMONv4 instances available on the X1E80100 SoC use the same interrupt number. Mark them are shared to allow for re-use across instances. Using IRQF_SHARED coupled with devm_request_threaded_irq implies that the irq can still trigger during/after bwmon_remove due to other active bwmon instances. Handle this race by relying on bwmon_disable to disable the interrupt and coupled with explicit request/free irqs. Signed-off-by: Sibi Sankar --- v3: * Update commit message describing the race condition. [Bjorn] * Update comment in the bwmon driver. [Dmitry] drivers/soc/qcom/icc-bwmon.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/soc/qcom/icc-bwmon.c b/drivers/soc/qcom/icc-bwmon.c index ecddb60bd665..e7851974084b 100644 --- a/drivers/soc/qcom/icc-bwmon.c +++ b/drivers/soc/qcom/icc-bwmon.c @@ -783,9 +783,14 @@ static int bwmon_probe(struct platform_device *pdev) bwmon->dev = dev; bwmon_disable(bwmon); - ret = devm_request_threaded_irq(dev, bwmon->irq, bwmon_intr, - bwmon_intr_thread, - IRQF_ONESHOT, dev_name(dev), bwmon); + + /* + * SoCs with multiple cpu-bwmon instances can end up using a shared interrupt + * line. Using the devm_ variant might result in the IRQ handler being executed + * after bwmon_disable in bwmon_remove() + */ + ret = request_threaded_irq(bwmon->irq, bwmon_intr, bwmon_intr_thread, + IRQF_ONESHOT | IRQF_SHARED, dev_name(dev), bwmon); if (ret) return dev_err_probe(dev, ret, "failed to request IRQ\n"); @@ -800,6 +805,7 @@ static void bwmon_remove(struct platform_device *pdev) struct icc_bwmon *bwmon = platform_get_drvdata(pdev); bwmon_disable(bwmon); + free_irq(bwmon->irq, bwmon); } static const struct icc_bwmon_data msm8998_bwmon_data = {