From patchwork Sat Nov 18 04:27:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Georgi Djakov X-Patchwork-Id: 13459864 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="DrGehSAV" Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 68996D72; Fri, 17 Nov 2023 20:28:04 -0800 (PST) Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3AI4D98Y023608; Sat, 18 Nov 2023 04:27:43 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=qcppdkim1; bh=jUI5kbNVf/1FMYk4A19JfXE3UZu/sfvc3lv2Q1F5K1w=; b=DrGehSAVD3gu9Bby7HQcohYyDBKa+rN/pczLiZctWqUzZh9Zzbynw3Kitr/US4CUpAeB cNzlDF/cTo5qD344wUinjQbG10Y+XhXRGfqEaLdOboI9j0I1xGX1s8kSrTHL0pT4cNF8 GWJYNT+Dl4U57tmaXIoxB1Y0uvQB+S+MEDGVJAdGHQia6xn+ZIifKABu8B2UDKpND2kP Bqb6FYDSqbyu1R2gNLsblyLvjd4/oaDwrpvZ8m2HYknyvoIPkL5x+iU8aeaFqNL82t7e yPfU9EpMYILFrjj6DQJ4wGcWzBKZkKlmldMDlQxtOR+7XJ6UG/WBYaCdpj3ne/OrHlMN 3g== Received: from nasanppmta01.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3uenne81cf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 18 Nov 2023 04:27:43 +0000 Received: from nasanex01a.na.qualcomm.com (nasanex01a.na.qualcomm.com [10.52.223.231]) by NASANPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 3AI4RgJF032712 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 18 Nov 2023 04:27:42 GMT Received: from hu-c-gdjako-lv.qualcomm.com (10.49.16.6) 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 15.2.1118.40; Fri, 17 Nov 2023 20:27:41 -0800 From: Georgi Djakov To: , , , , , CC: , , , , , , , , , , , Subject: [PATCH v2 0/6] Add support for Translation Buffer Units Date: Fri, 17 Nov 2023 20:27:24 -0800 Message-ID: <20231118042730.2799-1-quic_c_gdjako@quicinc.com> X-Mailer: git-send-email 2.17.1 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) 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-ORIG-GUID: 8JOfhQ0I-ti3QSgwp60sOsseosNNGr9M X-Proofpoint-GUID: 8JOfhQ0I-ti3QSgwp60sOsseosNNGr9M X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-18_02,2023-11-17_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 priorityscore=1501 spamscore=0 phishscore=0 mlxscore=0 malwarescore=0 adultscore=0 mlxlogscore=838 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311180032 The TCUs (Translation Control Units) and TBUs (Translation Buffer Units) are key components of the MMU-500. Multiple TBUs are connected to a single TCU over an interconnect. Each TBU contains a TLB that caches page tables. The MMU-500 implements a TBU for each connected master, and the TBU is designed, so that it is local to the master. The Qualcomm SDM845 platform has an implementation of the SMMU-500, that has multiple TBUs. A DT schema is added to describe the resources for each TBU (register space, power-domains, interconnects and clocks). The TBU driver will manage the resources and allow the system to operate the TBUs during a context fault to obtain details by doing s1 inv, software + hardware page table walks etc. This is implemented with ATOS/eCATs as the ATS feature is not supported. Being able to query the TBUs is useful for debugging various hardware/software issues on these platforms. v2: - Improve DT binding description, add full example. (Konrad) - Drop Qcom specific stuff from the generic binding. (Rob) - Unconditionally try to populate subnodes. (Konrad) - Improve TBU driver commit text, remove memory barriers. (Bjorn) - Move TBU stuff into separate file. Make the driver builtin. - TODO: Evaluate whether to keep TBU support as a separate driver or just instantiate things from qcom_smmu_impl_init() v1: https://lore.kernel.org/r/20231019021923.13939-1-quic_c_gdjako@quicinc.com Georgi Djakov (6): dt-bindings: iommu: Add Translation Buffer Unit bindings iommu/arm-smmu-qcom: Add support for TBUs iommu/arm-smmu-qcom: Add Qualcomm TBU driver iommu/arm-smmu: Allow using a threaded handler for context interrupts iommu/arm-smmu-qcom: Use a custom context fault handler for sdm845 arm64: dts: qcom: sdm845: Add DT nodes for the TBUs .../devicetree/bindings/iommu/arm,smmu.yaml | 25 + .../bindings/iommu/qcom,qsmmuv500-tbu.yaml | 89 ++++ arch/arm64/boot/dts/qcom/sdm845.dtsi | 82 +++ drivers/iommu/Kconfig | 8 + drivers/iommu/arm/arm-smmu/Makefile | 1 + .../iommu/arm/arm-smmu/arm-smmu-qcom-tbu.c | 504 ++++++++++++++++++ drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 12 + drivers/iommu/arm/arm-smmu/arm-smmu-qcom.h | 6 +- drivers/iommu/arm/arm-smmu/arm-smmu.c | 12 +- drivers/iommu/arm/arm-smmu/arm-smmu.h | 3 + 10 files changed, 739 insertions(+), 3 deletions(-) create mode 100644 Documentation/devicetree/bindings/iommu/qcom,qsmmuv500-tbu.yaml create mode 100644 drivers/iommu/arm/arm-smmu/arm-smmu-qcom-tbu.c