From e4c89f9380017b6b2e63836e2de1af8eb4535384 Mon Sep 17 00:00:00 2001 From: Maximilian Luz Date: Sun, 27 Aug 2023 23:14:04 +0200 Subject: lib/ucs2_string: Add UCS-2 strscpy function Add a ucs2_strscpy() function for UCS-2 strings. The behavior is equivalent to the standard strscpy() function, just for 16-bit character UCS-2 strings. Signed-off-by: Maximilian Luz Reviewed-by: Bjorn Andersson Link: https://lore.kernel.org/r/20230827211408.689076-2-luzmaximilian@gmail.com Signed-off-by: Bjorn Andersson --- include/linux/ucs2_string.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') diff --git a/include/linux/ucs2_string.h b/include/linux/ucs2_string.h index cf3ada3e820e..c499ae809c7d 100644 --- a/include/linux/ucs2_string.h +++ b/include/linux/ucs2_string.h @@ -10,6 +10,7 @@ typedef u16 ucs2_char_t; unsigned long ucs2_strnlen(const ucs2_char_t *s, size_t maxlength); unsigned long ucs2_strlen(const ucs2_char_t *s); unsigned long ucs2_strsize(const ucs2_char_t *data, unsigned long maxlength); +ssize_t ucs2_strscpy(ucs2_char_t *dst, const ucs2_char_t *src, size_t count); int ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len); unsigned long ucs2_utf8size(const ucs2_char_t *src); -- cgit v1.2.3 From 00b1248606ba3979ccae30ed11df8cdc1a84245a Mon Sep 17 00:00:00 2001 From: Maximilian Luz Date: Sun, 27 Aug 2023 23:14:05 +0200 Subject: firmware: qcom_scm: Add support for Qualcomm Secure Execution Environment SCM interface Add support for SCM calls to Secure OS and the Secure Execution Environment (SEE) residing in the TrustZone (TZ) via the QSEECOM interface. This allows communication with Secure/TZ applications, for example 'uefisecapp' managing access to UEFI variables. For better separation, make qcom_scm spin up a dedicated child (platform) device in case QSEECOM support has been detected. The corresponding driver for this device is then responsible for managing any QSEECOM clients. Specifically, this driver attempts to automatically detect known and supported applications, creating a client (auxiliary) device for each one. The respective client/auxiliary driver is then responsible for managing and communicating with the application. While this patch introduces only a very basic interface without the more advanced features (such as re-entrant and blocking SCM calls and listeners/callbacks), this is enough to talk to the aforementioned 'uefisecapp'. Signed-off-by: Maximilian Luz Reviewed-by: Johan Hovold Link: https://lore.kernel.org/r/20230827211408.689076-3-luzmaximilian@gmail.com Signed-off-by: Bjorn Andersson --- include/linux/firmware/qcom/qcom_qseecom.h | 46 ++++++++++++++++++++++++++++++ include/linux/firmware/qcom/qcom_scm.h | 22 ++++++++++++++ 2 files changed, 68 insertions(+) create mode 100644 include/linux/firmware/qcom/qcom_qseecom.h (limited to 'include/linux') diff --git a/include/linux/firmware/qcom/qcom_qseecom.h b/include/linux/firmware/qcom/qcom_qseecom.h new file mode 100644 index 000000000000..b531547e1dc9 --- /dev/null +++ b/include/linux/firmware/qcom/qcom_qseecom.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Driver for Qualcomm Secure Execution Environment (SEE) interface (QSEECOM). + * Responsible for setting up and managing QSEECOM client devices. + * + * Copyright (C) 2023 Maximilian Luz + */ +#include +#include + +#include + +/** + * struct qseecom_client - QSEECOM client device. + * @aux_dev: Underlying auxiliary device. + * @app_id: ID of the loaded application. + */ +struct qseecom_client { + struct auxiliary_device aux_dev; + u32 app_id; +}; + +/** + * qcom_qseecom_app_send() - Send to and receive data from a given QSEE app. + * @client: The QSEECOM client associated with the target app. + * @req: Request buffer sent to the app (must be DMA-mappable). + * @req_size: Size of the request buffer. + * @rsp: Response buffer, written to by the app (must be DMA-mappable). + * @rsp_size: Size of the response buffer. + * + * Sends a request to the QSEE app associated with the given client and read + * back its response. The caller must provide two DMA memory regions, one for + * the request and one for the response, and fill out the @req region with the + * respective (app-specific) request data. The QSEE app reads this and returns + * its response in the @rsp region. + * + * Note: This is a convenience wrapper around qcom_scm_qseecom_app_send(). + * Clients should prefer to use this wrapper. + * + * Return: Zero on success, nonzero on failure. + */ +static inline int qcom_qseecom_app_send(struct qseecom_client *client, void *req, size_t req_size, + void *rsp, size_t rsp_size) +{ + return qcom_scm_qseecom_app_send(client->app_id, req, req_size, rsp, rsp_size); +} diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h index 0c091a3f6d49..e1ea2eb56d04 100644 --- a/include/linux/firmware/qcom/qcom_scm.h +++ b/include/linux/firmware/qcom/qcom_scm.h @@ -122,4 +122,26 @@ extern int qcom_scm_lmh_dcvsh(u32 payload_fn, u32 payload_reg, u32 payload_val, extern int qcom_scm_lmh_profile_change(u32 profile_id); extern bool qcom_scm_lmh_dcvsh_available(void); +#ifdef CONFIG_QCOM_QSEECOM + +int qcom_scm_qseecom_app_get_id(const char *app_name, u32 *app_id); +int qcom_scm_qseecom_app_send(u32 app_id, void *req, size_t req_size, void *rsp, + size_t rsp_size); + +#else /* CONFIG_QCOM_QSEECOM */ + +static inline int qcom_scm_qseecom_app_get_id(const char *app_name, u32 *app_id) +{ + return -EINVAL; +} + +static inline int qcom_scm_qseecom_app_send(u32 app_id, void *req, + size_t req_size, void *rsp, + size_t rsp_size) +{ + return -EINVAL; +} + +#endif /* CONFIG_QCOM_QSEECOM */ + #endif -- cgit v1.2.3