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@xxxxxxxxx/t/ - V2: https://lore.kernel.org/lkml/20230127184650.756795-1-luzmaximilian@xxxxxxxxx/ - V1: https://lore.kernel.org/lkml/20220723224949.1089973-1-luzmaximilian@xxxxxxxxx/ 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 -- 2.40.1
