From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7A568C54F30 for ; Tue, 27 May 2025 06:57:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9290110E414; Tue, 27 May 2025 06:57:41 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.b="oGUYS1ma"; dkim-atps=neutral Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0563010E413 for ; Tue, 27 May 2025 06:57:37 +0000 (UTC) Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 54R4P3rP001212 for ; Tue, 27 May 2025 06:57:37 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= LDW2lLJjVVFwgwPCZKo49aI6NM0IvCEjQ6HwcjeAopg=; b=oGUYS1maWn4Fkpeg wt1ereETu9Y2GodTAKm3Wjmi48R47J54W88sbKhnxcDqnRHv3ljn5lydw/A2v2CY /UzW3DWFHQOgjdjcpZFzWrDxaCdAhGej9lEaIS1nmWvO5SI55NFEUvZ+VQXPpJHW 0lklA4f22/fQuVcHxJlvQ4CZDptISozn1nGQrlQMsJ3BpYoVf2Yqb5jUw2UpNOcn hY5v4zvsDrySvBTrr4WtPtctLDL4ayLRWO812IvQl3idbuQch4vQycahbvUgbWpO 5wAFRW1iwBFM+e7U3SqJbChOZ0Z8TPaMKZshuypvZxHNqa1JlPy3ffDlhoSl07/f cUnz+A== Received: from mail-pf1-f199.google.com (mail-pf1-f199.google.com [209.85.210.199]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 46u3fq644q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT) for ; Tue, 27 May 2025 06:57:37 +0000 (GMT) Received: by mail-pf1-f199.google.com with SMTP id d2e1a72fcca58-745e89b0c32so4859961b3a.3 for ; Mon, 26 May 2025 23:57:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1748329056; x=1748933856; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=LDW2lLJjVVFwgwPCZKo49aI6NM0IvCEjQ6HwcjeAopg=; b=qxDFSS72RCbKT6GEhBdh80hCC+edGXA59wfaXJJUa4xEn8P+M/ai9QwLu8AgJlBqT5 b2AXXH0jrbzyUlW+GtUywjc9DLgHC0Bi7nFOPUMnzqNLlubtT2VqGzuCDCLzQdlYYUQE XXJfA/euk7Bb4fogEyMhcWu8+eY7x2pljzFiwu0dC2oaJ3oGfVyVHVmfWZNDEfE0p9// DNDA90fRsI2ZgDb+0Sq/r7Qpn2VIqsb2z6aN2IdBy0bxKN0oRVJqW5MFK8aJX8eLIswm L9gTixR2lSiM5gVJhNLcLvq2744vbjH2vLxUXKrRvbzNrSCIpXGdCoeTVYT2Jj+J470i bg9Q== X-Forwarded-Encrypted: i=1; AJvYcCV0fi9hlFQGCX5/lmlvswdO66Tjt1OPwoHC+9fFzsYPmALyCHzqKvMiTCw8ubRBPVZOfGIsFZvYLTc=@lists.freedesktop.org X-Gm-Message-State: AOJu0YwUUqSuKrkDoA/SnLLgM7425SFduzcX0BYzaYj+Ou4et7I6XLm0 3meYeN+fmYoXJwOS5yUbDhI5oQA3HNgv4obbp3zz6lBcW/vUbEZS9laOb+DvqHLAwvAUVd8fTMq k/pje3/rE4Fp+hC3BdCWM+bIrCCmeS6v8m0pkRFueguJWI4Xe5wWVM1oSdcBBiZjXfiwiOg== X-Gm-Gg: ASbGncv5HvFrUMXcmc6L3H/1MzUFozMlHZplxl2j8fTYY5TEKTJwzjQOEWlzhP7M8mY tey/lbsKvSSN5qNMjpIi6kgEkO2Z+K65Q2Zzo+IaQ02pUgA0GBiJVIPpL0KB8Sbt4D2uKkBWBLk 0KiLX2qAQkwRSstWtUWOoN9Y++VD24L8Jsjiv6I4ZLO51FeYv51Q0EoZ8RXgJu+iTbDClhwLnkF /HKUJeVQz3xRyKBcTApH4qoBty+Gn8jPRLSrsE9D/kcFq4TG3HgTWXPZJh/mR4fgMaHP/5cO4ba 5qDtDFBbu6Ut4pcqJT02OVuMS8D7zloN5KSXbjJj+SEkKq/ZjMD7cWVEHwHntypLfHK0T/A= X-Received: by 2002:a05:6a00:2388:b0:740:91eb:c66 with SMTP id d2e1a72fcca58-745fde95d69mr18678995b3a.3.1748329055783; Mon, 26 May 2025 23:57:35 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHatwnSlnB4ysD1+0cl+0KDFq1qTpPuz2/PIHrgjsZTiQ1dLavAZ2MsgRFbjk4IiymG+qhS2g== X-Received: by 2002:a05:6a00:2388:b0:740:91eb:c66 with SMTP id d2e1a72fcca58-745fde95d69mr18678947b3a.3.1748329055325; Mon, 26 May 2025 23:57:35 -0700 (PDT) Received: from hu-azarrabi-lv.qualcomm.com (Global_NAT1.qualcomm.com. [129.46.96.20]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-742a970954asm18037286b3a.46.2025.05.26.23.57.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 May 2025 23:57:34 -0700 (PDT) From: Amirreza Zarrabi Date: Mon, 26 May 2025 23:56:57 -0700 Subject: [PATCH v5 12/12] Documentation: tee: Add Qualcomm TEE driver MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250526-qcom-tee-using-tee-ss-without-mem-obj-v5-12-024e3221b0b9@oss.qualcomm.com> References: <20250526-qcom-tee-using-tee-ss-without-mem-obj-v5-0-024e3221b0b9@oss.qualcomm.com> In-Reply-To: <20250526-qcom-tee-using-tee-ss-without-mem-obj-v5-0-024e3221b0b9@oss.qualcomm.com> To: Jens Wiklander , Sumit Garg , Bjorn Andersson , Konrad Dybcio , Bartosz Golaszewski , Apurupa Pattapu , Kees Cook , "Gustavo A. R. Silva" , Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= Cc: Harshal Dev , linux-arm-msm@vger.kernel.org, op-tee@lists.trustedfirmware.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-doc@vger.kernel.org, Amirreza Zarrabi X-Mailer: b4 0.13.0 X-Proofpoint-GUID: lAaePZN71NTMfckie5pnwCB5nX45aBqN X-Proofpoint-ORIG-GUID: lAaePZN71NTMfckie5pnwCB5nX45aBqN X-Authority-Analysis: v=2.4 cv=X8FSKHTe c=1 sm=1 tr=0 ts=68356261 cx=c_pps a=WW5sKcV1LcKqjgzy2JUPuA==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=dt9VzEwgFbYA:10 a=EUspDBNiAAAA:8 a=7CQSdrXTAAAA:8 a=VwQbUJbxAAAA:8 a=4VYrYejmMApVX9KxlZkA:9 a=QEXdDO2ut3YA:10 a=M0EVDjxxv-UA:10 a=OpyuDcXvxspvyRM73sMx:22 a=a-qgeE7W1pNrGK8U0ZQC:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNTI3MDA1NCBTYWx0ZWRfX3QSufSjbS2zU Lmq7yEmtzmmK/UZSu2Z4itLdgAWmKBBQRDEpxKUUTOmaTofto2VExZT5rvowv/XsogQahQ6hDMp RFhtdQvIWEH0mx2eC8wKqiKTjnF6ZTK3Ffs8TNuXAZSUXPjBpiJiTopJY9ptmjvq9OtzcfY9HO9 xL5Fcygm9GiMvRCmktQhbV6NP0YYFiVFlCDMlKlRjGNYrBOvQGN4SobXFJUi4xuq0sS2gGIdlXa ZZq+cAVzGjCnDBsA7w+41FDO3sk6d3g6hH4sgivJMlbjMxTOw9YMn0FBnaf/GC3XND7TPdUEOQH 9Yd2Z0BSIQqYFndiNgRgJ0odud8CrfuwyAc7kIMTDuGtMGp84gYuiMY8CxXollx5y4OGC6eQgDo XU4b7wz/4J9Ws2qTL9zenydW8iGpB/zWk7fSkvzFxDOMzumzdRRi9NM0XZVhINfYk3yPb/p8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-05-27_03,2025-05-26_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 phishscore=0 bulkscore=0 mlxlogscore=999 mlxscore=0 clxscore=1015 priorityscore=1501 spamscore=0 adultscore=0 malwarescore=0 lowpriorityscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505160000 definitions=main-2505270054 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add documentation for the Qualcomm TEE driver. Signed-off-by: Amirreza Zarrabi --- Documentation/tee/index.rst | 1 + Documentation/tee/qtee.rst | 150 ++++++++++++++++++++++++++++++++++++++++++++ MAINTAINERS | 1 + 3 files changed, 152 insertions(+) diff --git a/Documentation/tee/index.rst b/Documentation/tee/index.rst index 4be6e69d7837..62afb7ee9b52 100644 --- a/Documentation/tee/index.rst +++ b/Documentation/tee/index.rst @@ -11,6 +11,7 @@ TEE Subsystem op-tee amd-tee ts-tee + qtee .. only:: subproject and html diff --git a/Documentation/tee/qtee.rst b/Documentation/tee/qtee.rst new file mode 100644 index 000000000000..8ae4da17c3a7 --- /dev/null +++ b/Documentation/tee/qtee.rst @@ -0,0 +1,150 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================================= +QTEE (Qualcomm Trusted Execution Environment) +============================================= + +The QTEE driver handles communication with Qualcomm TEE [1]. + +The lowest level of communication with QTEE builds on the ARM SMC Calling +Convention (SMCCC) [2], which is the foundation for QTEE's Secure Channel +Manager (SCM) [3] used internally by the driver [4]. + +In a QTEE-based system, services are represented as objects with a series of +operations that can be called to produce results, including other objects. + +When an object is hosted within QTEE, executing its operations is referred +to as direct invocation. QTEE can invoke objects hosted in the kernel or +userspace using a method known as callback requests. + +The SCM provides two functions for direct invocation and callback request: + +- QCOM_SCM_SMCINVOKE_INVOKE for direct invocation. It can return either + a result or a callback request. +- QCOM_SCM_SMCINVOKE_CB_RSP submits a response for a previous callback request. + +The QTEE Transport Message [5] is stacked on top of the SCM driver functions. + +A message consists of two buffers shared with QTEE: inbound and outbound +buffers. The inbound buffer is used for direct invocation, and the outbound +buffer is used to make callback requests. This picture shows the contents of +a QTEE transport message:: + + +---------------------+ + | v + +-----------------+-------+-------+------+--------------------------+ + | qcomtee_msg_ |object | buffer | | + | object_invoke | id | offset, size | | (inbound buffer) + +-----------------+-------+--------------+--------------------------+ + <---- header -----><---- arguments ------><- in/out buffer payload -> + + +-----------+ + | v + +-----------------+-------+-------+------+----------------------+ + | qcomtee_msg_ |object | buffer | | + | callback | id | offset, size | | (outbound buffer) + +-----------------+-------+--------------+----------------------+ + +Each buffer is started with a header and array of arguments. + +QTEE Transport Message supports four types of arguments: + +- Input Object (IO) is an object parameter to the current invocation + or callback request. +- Output Object (OO) is an object parameter from the current invocation + or callback request. +- Input Buffer (IB) is (offset, size) pair to the inbound or outbound region + to store parameter to the current invocation or callback request. +- Output Buffer (OB) is (offset, size) pair to the inbound or outbound region + to store parameter from the current invocation or callback request. + +The QTEE driver provides the qcomtee_object, which represents an object within +both QTEE and the kernel. To access any service in QTEE, a client needs to +invoke an instance of this object. Any structure intended to represent a service +for export to QTEE should include an instance of qcomtee_object:: + + struct driver_service { + struct qcomtee_object object; + ... + }; + + #define to_driver_service_object(o) container_of((o), struct driver_service, object) + + static int driver_service_dispatch(struct qcomtee_object *object, u32 op, + struct qcomtee_arg *args) + { + struct driver_service *so = to_driver_service_object(object); + + switch(op) { + case OBJECT_OP1: + ... + break; + default: + return -EINVAL; + } + } + + static void driver_service_object_release(struct si_object *object) + { + struct driver_service *so = to_driver_service_object(object); + kfree(so); + } + + struct si_object_operations driver_service_ops = { + .release = driver_service_object_release; + .dispatch = driver_service_dispatch; + }; + + void service_init(void) + { + struct driver_service *so = kzalloc(sizeof(*so), GFP_KERNEL); + + /* Initialize so->object as a callback object. */ + qcomtee_object_user_init(&so->object, QCOMTEE_OBJECT_TYPE_CB_OBJECT, + &driver_service_ops, "driver_service_object"); + + /* Invoke a QTEE object and pass/register 'so->object' with QTEE. */ + ... + } + module_init(service_init); + +The QTEE driver utilizes qcomtee_object to encapsulate userspace objects. When +a callback request is made, it translates into calling the dispatch operation. +For userspace objects, this is converted into requests accessible to callback +servers and available through generic TEE API IOCTLs. + +Picture of the relationship between the different components in the QTEE +architecture:: + + User space Kernel Secure world + ~~~~~~~~~~ ~~~~~~ ~~~~~~~~~~~~ + +--------+ +----------+ +--------------+ + | Client | |callback | | Trusted | + +--------+ |server | | Application | + /\ +----------+ +--------------+ + || +----------+ /\ /\ + || |callback | || || + || |server | || \/ + || +----------+ || +--------------+ + \/ /\ || | TEE Internal | + +-------+ || || | API | + | TEE | || || +--------+--------+ +--------------+ + | Client| || || | TEE | QTEE | | QTEE | + | API | \/ \/ | subsys | driver | | Trusted OS | + +-------+----------------+----+-------+----+-------------+--------------+ + | Generic TEE API | | QTEE MSG | + | IOCTL (TEE_IOC_*) | | SMCCC (QCOM_SCM_SMCINVOKE_*) | + +-----------------------------+ +---------------------------------+ + +References +========== + +[1] https://docs.qualcomm.com/bundle/publicresource/topics/80-70015-11/qualcomm-trusted-execution-environment.html + +[2] http://infocenter.arm.com/help/topic/com.arm.doc.den0028a/index.html + +[3] drivers/firmware/qcom/qcom_scm.c + +[4] drivers/tee/qcomtee/qcom_scm.c + +[5] drivers/tee/qcomtee/qcomtee_msg.h diff --git a/MAINTAINERS b/MAINTAINERS index 99fe1ae22ae0..42823d33cc03 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -20515,6 +20515,7 @@ QUALCOMM TEE (QCOMTEE) DRIVER M: Amirreza Zarrabi L: linux-arm-msm@vger.kernel.org S: Maintained +F: Documentation/tee/qtee.rst F: drivers/tee/qcomtee/ F: include/linux/firmware/qcom/qcom_tee.h -- 2.34.1