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[217.234.60.144]) by smtp.gmail.com with ESMTPSA id 24-20020a05600c22d800b003f4e47c6504sm15995411wmg.21.2023.05.28.16.03.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 28 May 2023 16:03:57 -0700 (PDT) From: Maximilian Luz To: Bjorn Andersson Cc: Maximilian Luz , Andy Gross , Konrad Dybcio , Ard Biesheuvel , Ilias Apalodimas , Srinivas Kandagatla , Sudeep Holla , Johan Hovold , Steev Klimaszewski , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 0/4] firmware: Add support for Qualcomm UEFI Secure Application Date: Mon, 29 May 2023 01:03:47 +0200 Message-Id: <20230528230351.168210-1-luzmaximilian@gmail.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This series adds basic support for the QSEECOM interface used to communicate with secure applications running in the TrustZone on certain Qualcomm devices. In addition to that, it also provides a driver for "uefisecapp", the secure application managing access to UEFI variables on such platforms. For a more detailed description, see the blurb of v1. Previous versions: - V3: https://lore.kernel.org/lkml/20230305022119.1331495-4-luzmaximilian@gmail.com/t/ - V2: https://lore.kernel.org/lkml/20230127184650.756795-1-luzmaximilian@gmail.com/ - V1: https://lore.kernel.org/lkml/20220723224949.1089973-1-luzmaximilian@gmail.com/ Patch 4 of this series depends on commit d86ff3333cb1 ("efivarfs: expose used and total size") from the "next" branch of https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git Changes in v4: - Integrate the QSEECOM interface into qcom_scm.c instead of instantiating a custom device and requiring device-tree bindings for it. With that, drop the respective patches exporting SCM call functions from qcom_scm.c and the DT bindings. - Restructure management of DMA memory and move DMA mapping entirely into the app_send() command, removing the need for DMA handling in app client drivers. - Add support for EFI's query_variable_info() call. - Move UCS-2 string helpers to lib/ucs2_string.c (introduces patch 1). - Add fix for related cleanup-issue in qcom_scm.c (introduces patch 2). (Refer to individual patches for more details.) Changes in v3: - Fix doc comment in qcom_scm.c - Rebase on top of latest changes to qcom_scm. Changes in v2: - Bind the qseecom interface to a device. - Establish a device link between the new qseecom device and the SCM device to ensure proper PM and remove ordering. - Remove the compatible for uefisecapp. Instead, introduce a compatible for the qseecom device. This directly reflects ACPI tables and the QCOM0476 device described therein, which is responsible for the secure app / qseecom interface (i.e., the same purpose). Client devices representing apps handled by the kernel (such as uefisecapp) are now directly instantiated by the qseecom driver, based on the respective platform-specific compatible. - Rename the base name (qctree -> qseecom) to allow differentiation between old (qseecom) and new (smcinvoke) interfaces to the trusted execution environment. This directly reflects downstream naming by Qualcomm. Maximilian Luz (4): lib/ucs2_string: Add UCS-2 strlcpy function firmware: qcom_scm: Clear scm pointer on probe failure firmware: qcom_scm: Add support for Qualcomm Secure Execution Environment SCM interface firmware: Add support for Qualcomm UEFI Secure Application MAINTAINERS | 6 + drivers/firmware/Kconfig | 33 + drivers/firmware/Makefile | 1 + drivers/firmware/qcom_qseecom_uefisecapp.c | 885 +++++++++++++++++++++ drivers/firmware/qcom_scm.c | 419 +++++++++- include/linux/firmware/qcom/qcom_scm.h | 27 + include/linux/ucs2_string.h | 1 + lib/ucs2_string.c | 16 + 8 files changed, 1387 insertions(+), 1 deletion(-) create mode 100644 drivers/firmware/qcom_qseecom_uefisecapp.c