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[217.234.55.67]) by smtp.gmail.com with ESMTPSA id x3-20020adff0c3000000b0021deba99142sm7799284wro.40.2022.07.23.15.50.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 23 Jul 2022 15:50:16 -0700 (PDT) From: Maximilian Luz To: Andy Gross , Bjorn Andersson , Ard Biesheuvel Cc: Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Steev Klimaszewski , Shawn Guo , Sudeep Holla , Cristian Marussi , Greg Kroah-Hartman , linux-arm-msm@vger.kernel.org, linux-efi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Maximilian Luz Subject: [PATCH 2/4] firmware: Add support for Qualcomm Trusted Execution Environment SCM calls Date: Sun, 24 Jul 2022 00:49:47 +0200 Message-Id: <20220723224949.1089973-3-luzmaximilian@gmail.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220723224949.1089973-1-luzmaximilian@gmail.com> References: <20220723224949.1089973-1-luzmaximilian@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add support for SCM calls to Secure OS and the Trusted Execution Environment (TEE/TrEE) residing in the TrustZone (TZ). This allows communication with Secure/TZ applications, for example 'uefisecapp' managing access to UEFI variables. 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 --- MAINTAINERS | 7 ++ drivers/firmware/Kconfig | 4 + drivers/firmware/Makefile | 1 + drivers/firmware/qcom_tee.c | 213 ++++++++++++++++++++++++++++++++++++ include/linux/qcom_tee.h | 179 ++++++++++++++++++++++++++++++ 5 files changed, 404 insertions(+) create mode 100644 drivers/firmware/qcom_tee.c create mode 100644 include/linux/qcom_tee.h diff --git a/MAINTAINERS b/MAINTAINERS index e9eaceeb61ef..e174747df92f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -16587,6 +16587,13 @@ F: Documentation/networking/device_drivers/cellular/qualcomm/rmnet.rst F: drivers/net/ethernet/qualcomm/rmnet/ F: include/linux/if_rmnet.h +QUALCOMM TRUSTED EXECUTION ENVIRONMENT DRIVER +M: Maximilian Luz +L: linux-arm-msm@vger.kernel.org +S: Maintained +F: drivers/firmware/qcom_tee.c +F: include/linux/qcom_tee.h + QUALCOMM TSENS THERMAL DRIVER M: Amit Kucheria M: Thara Gopinath diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index b59e3041fd62..cde60a332b3c 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -226,6 +226,10 @@ config QCOM_SCM_DOWNLOAD_MODE_DEFAULT Say Y here to enable "download mode" by default. +config QCOM_TEE + tristate + select QCOM_SCM + config SYSFB bool select BOOT_VESA_SUPPORT diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile index 28fcddcd688f..93dbc6b5a603 100644 --- a/drivers/firmware/Makefile +++ b/drivers/firmware/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_RASPBERRYPI_FIRMWARE) += raspberrypi.o obj-$(CONFIG_FW_CFG_SYSFS) += qemu_fw_cfg.o obj-$(CONFIG_QCOM_SCM) += qcom-scm.o qcom-scm-objs += qcom_scm.o qcom_scm-smc.o qcom_scm-legacy.o +obj-$(CONFIG_QCOM_TEE) += qcom_tee.o obj-$(CONFIG_SYSFB) += sysfb.o obj-$(CONFIG_SYSFB_SIMPLEFB) += sysfb_simplefb.o obj-$(CONFIG_TI_SCI_PROTOCOL) += ti_sci.o diff --git a/drivers/firmware/qcom_tee.c b/drivers/firmware/qcom_tee.c new file mode 100644 index 000000000000..7a93776a901d --- /dev/null +++ b/drivers/firmware/qcom_tee.c @@ -0,0 +1,213 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Interface driver for the Qualcomm Trusted Execution Environment (TrEE or + * TEE) / TrustZone secure OS (TzOS). Manages communication via Secure Channel + * Manager (SCM) calls. + * + * Copyright (C) 2022 Maximilian Luz + */ + +#include +#include +#include +#include +#include +#include + +#include + + +/* -- Secure-OS SCM call interface. ----------------------------------------- */ + +static DEFINE_MUTEX(scm_call_lock); + +static int __qctee_os_scm_call(const struct qcom_scm_desc *desc, + struct qctee_os_scm_resp *res) +{ + struct qcom_scm_res scm_res = {}; + int status; + + status = qcom_scm_call(desc, &scm_res); + + res->status = scm_res.result[0]; + res->resp_type = scm_res.result[1]; + res->data = scm_res.result[2]; + + if (status) + return status; + + return 0; +} + +/** + * qctee_os_scm_call() - Perform a TrEE SCM call. + * @dev: The (client) device to use for logging. + * @desc: SCM call descriptor. + * @res: SCM call response (output). + * + * Performs the TrEE SCM call described by @desc, returning the response in + * @rsp. The provided device @dev is used exclusively for logging. + * + * Return: Returns zero on success, nonzero on failure. + */ +int qctee_os_scm_call(struct device *dev, const struct qcom_scm_desc *desc, + struct qctee_os_scm_resp *res) +{ + int status; + + /* + * Note: Multiple TrEE SCM calls should not be executed same time, so + * lock things here. This needs to be extended to callback/listener + * handling when support for that is implemented. + */ + + mutex_lock(&scm_call_lock); + status = __qctee_os_scm_call(desc, res); + mutex_unlock(&scm_call_lock); + + dev_dbg(dev, "%s: owner=%x, svc=%x, cmd=%x, status=%lld, type=%llx, data=%llx", + __func__, desc->owner, desc->svc, desc->cmd, res->status, + res->resp_type, res->data); + + if (status) { + dev_err(dev, "qcom_scm_call failed with error %d\n", status); + return status; + } + + /* + * TODO: Handle incomplete and blocked calls: + * + * Incomplete and blocked calls are not supported yet. Some devices + * and/or commands require those, some don't. Let's warn about them + * prominently in case someone attempts to try these commands with a + * device/command combination that isn't supported yet. + */ + WARN_ON(res->status == QCTEE_OS_RESULT_INCOMPLETE); + WARN_ON(res->status == QCTEE_OS_RESULT_BLOCKED_ON_LISTENER); + + return 0; +} +EXPORT_SYMBOL_GPL(qctee_os_scm_call); + + +/* -- Secure App interface. ------------------------------------------------- */ + +/** + * qctee_app_get_id() - Query the app ID for a given TrEE app name. + * @dev: The (client) device used for logging and DMA mapping. + * @app_name: The name of the app. + * @app_id: The returned app ID. + * + * Query and return the application ID of the TrEE app identified by the given + * name. This returned ID is the unique identifier of the app required for + * subsequent communication. + * + * Return: Returns zero on success, nonzero on failure. Returns -ENOENT if the + * app has not been loaded or could not be found. + */ +int qctee_app_get_id(struct device *dev, const char *app_name, u32 *app_id) +{ + unsigned long name_buf_size = QCTEE_MAX_APP_NAME_SIZE; + unsigned long app_name_len = strlen(app_name); + struct qcom_scm_desc desc = {}; + struct qctee_os_scm_resp res = {}; + dma_addr_t name_buf_phys; + char *name_buf; + int status; + + if (app_name_len >= name_buf_size) + return -EINVAL; + + name_buf = kzalloc(name_buf_size, GFP_KERNEL); + if (!name_buf) + return -ENOMEM; + + memcpy(name_buf, app_name, app_name_len); + + name_buf_phys = dma_map_single(dev, name_buf, name_buf_size, DMA_TO_DEVICE); + if (dma_mapping_error(dev, name_buf_phys)) { + kfree(name_buf); + dev_err(dev, "failed to map dma address\n"); + return -EFAULT; + } + + desc.owner = QCTEE_TZ_OWNER_QSEE_OS; + desc.svc = QCTEE_TZ_SVC_APP_MGR; + desc.cmd = 0x03; + desc.arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_RW, QCOM_SCM_VAL); + desc.args[0] = name_buf_phys; + desc.args[1] = app_name_len; + + status = qctee_os_scm_call(dev, &desc, &res); + dma_unmap_single(dev, name_buf_phys, name_buf_size, DMA_TO_DEVICE); + kfree(name_buf); + + if (status) + return status; + + if (res.status != QCTEE_OS_RESULT_SUCCESS) + return -ENOENT; + + *app_id = res.data; + return 0; +} +EXPORT_SYMBOL_GPL(qctee_app_get_id); + +/** + * qctee_app_send() - Send to and receive data from a given TrEE app. + * @dev: The (client) device used for logging. + * @app_id: The ID of the app to communicate with. + * @req: DMA region of the request sent to the app. + * @rsp: DMA region of the response returned by the app. + * + * Sends a request to the TrEE app identified by the given ID 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 TrEE app reads this and returns + * its response in the @rsp region. + * + * Return: Returns zero on success, nonzero on failure. + */ +int qctee_app_send(struct device *dev, u32 app_id, struct qctee_dma *req, struct qctee_dma *rsp) +{ + struct qctee_os_scm_resp res = {}; + int status; + + struct qcom_scm_desc desc = { + .owner = QCTEE_TZ_OWNER_TZ_APPS, + .svc = QCTEE_TZ_SVC_APP_ID_PLACEHOLDER, + .cmd = 0x01, + .arginfo = QCOM_SCM_ARGS(5, QCOM_SCM_VAL, + QCOM_SCM_RW, QCOM_SCM_VAL, + QCOM_SCM_RW, QCOM_SCM_VAL), + .args[0] = app_id, + .args[1] = req->phys, + .args[2] = req->size, + .args[3] = rsp->phys, + .args[4] = rsp->size, + }; + + /* Make sure the request is fully written before sending it off. */ + dma_wmb(); + + status = qctee_os_scm_call(dev, &desc, &res); + + /* Make sure we don't attempt any reads before the SCM call is done. */ + dma_rmb(); + + if (status) + return status; + + if (res.status != QCTEE_OS_RESULT_SUCCESS) + return -EIO; + + return 0; +} +EXPORT_SYMBOL_GPL(qctee_app_send); + + +/* -- Module metadata. ------------------------------------------------------ */ + +MODULE_AUTHOR("Maximilian Luz "); +MODULE_DESCRIPTION("Interface for Qualcomm TrEE/TZ secure OS and secure applications"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/qcom_tee.h b/include/linux/qcom_tee.h new file mode 100644 index 000000000000..b904d6a010d7 --- /dev/null +++ b/include/linux/qcom_tee.h @@ -0,0 +1,179 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Interface driver for the Qualcomm Trusted Execution Environment (TrEE/TEE) / + * TrustZone OS (TzOS). Manages communication via Secure Channel Manager (SCM) + * calls. + * + * Copyright (C) 2022 Maximilian Luz + */ + +#ifndef _LINUX_QCOM_TEE_H +#define _LINUX_QCOM_TEE_H + +#include +#include +#include +#include +#include +#include + + +/* -- DMA helpers. ---------------------------------------------------------- */ + +/* DMA requirements for TrEE SCM calls. */ +#define QCTEE_DMA_ALIGNMENT 8 +#define QCTEE_DMA_ALIGN(ptr) ALIGN(ptr, QCTEE_DMA_ALIGNMENT) + +/** + * struct qctee_dma - DMA memory region. + * @size: Size of the memory region, in bytes. + * @virt: Pointer / virtual address to the memory, accessible by the kernel. + * @phys: Physical address of the memory region. + */ +struct qctee_dma { + unsigned long size; + void *virt; + dma_addr_t phys; +}; + +/** + * qctee_dma_alloc() - Allocate a DMA-able memory region suitable for TrEE SCM + * calls. + * @dev: The device used for DMA memory allocation. + * @dma: Where to write the allocated memory addresses and size to. + * @size: Minimum size of the memory to be allocated. + * @gfp: Flags used for allocation. + * + * Allocate a DMA-able memory region suitable for interaction with TrEE + * services and the TzOS. The provided size is treated as the minimum required + * size and rounded up, if necessary. The actually allocated memory region will + * be stored in @dma. Allocated memory must be freed via qctee_dma_free(). + * + * Return: Returns zero on success, -ENOMEM on allocation failure. + */ +static inline int qctee_dma_alloc(struct device *dev, struct qctee_dma *dma, + unsigned long size, gfp_t gfp) +{ + size = PAGE_ALIGN(size); + + dma->virt = dma_alloc_coherent(dev, size, &dma->phys, GFP_KERNEL); + if (!dma->virt) + return -ENOMEM; + + dma->size = size; + return 0; +} + +/** + * qctee_dma_free() - Free a DMA memory region. + * @dev: The device used for allocation. + * @dma: The DMA region to be freed. + * + * Free a DMA region previously allocated via qctee_dma_alloc(). Note that + * freeing sub-regions is not supported. + */ +static inline void qctee_dma_free(struct device *dev, struct qctee_dma *dma) +{ + dma_free_coherent(dev, dma->size, dma->virt, dma->phys); +} + +/** + * qctee_dma_realloc() - Re-allocate DMA memory region with the requested size. + * @dev: The device used for allocation. + * @dma: The region descriptor to be updated. + * @size: The new requested size. + * @gfp: Flags used for allocation. + * + * Re-allocates a DMA memory region suitable for TrEE SCM calls to fit the + * requested amount of bytes, if necessary. Does nothing if the provided region + * already has enough space to store the requested data. + * + * See qctee_dma_alloc() for details. + * + * Return: Returns zero on success, -ENOMEM on allocation failure. + */ +static inline int qctee_dma_realloc(struct device *dev, struct qctee_dma *dma, + unsigned long size, gfp_t gfp) +{ + if (PAGE_ALIGN(size) <= dma->size) + return 0; + + qctee_dma_free(dev, dma); + return qctee_dma_alloc(dev, dma, size, gfp); +} + +/** + * qctee_dma_aligned() - Create a aligned DMA memory sub-region suitable for + * TrEE SCM calls. + * @base: Base DMA memory region, in which the new region will reside. + * @out: Descriptor to store the aligned sub-region in. + * @offset: The offset inside base region at which to place the new sub-region. + * + * Creates an aligned DMA memory region suitable for TrEE SCM calls at or after + * the given offset. The size of the sub-region will be set to the remaining + * size in the base region after alignment, i.e. the end of the sub-region will + * be equal the end of the base region. + * + * Return: Returns zero on success or -EINVAL if the new aligned memory address + * would point outside the base region. + */ +static inline int qctee_dma_aligned(const struct qctee_dma *base, struct qctee_dma *out, + unsigned long offset) +{ + void *aligned = (void *)QCTEE_DMA_ALIGN((uintptr_t)base->virt + offset); + + if (aligned - base->virt > base->size) + return -EINVAL; + + out->virt = aligned; + out->phys = base->phys + (out->virt - base->virt); + out->size = base->size - (out->virt - base->virt); + + return 0; +} + + +/* -- Secure-OS SCM call interface. ----------------------------------------- */ + +#define QCTEE_TZ_OWNER_TZ_APPS 48 +#define QCTEE_TZ_OWNER_QSEE_OS 50 + +#define QCTEE_TZ_SVC_APP_ID_PLACEHOLDER 0 +#define QCTEE_TZ_SVC_APP_MGR 1 + +enum qctee_os_scm_result { + QCTEE_OS_RESULT_SUCCESS = 0, + QCTEE_OS_RESULT_INCOMPLETE = 1, + QCTEE_OS_RESULT_BLOCKED_ON_LISTENER = 2, + QCTEE_OS_RESULT_FAILURE = 0xFFFFFFFF, +}; + +enum qctee_os_scm_resp_type { + QCTEE_OS_SCM_RES_APP_ID = 0xEE01, + QCTEE_OS_SCM_RES_QSEOS_LISTENER_ID = 0xEE02, +}; + +/** + * struct qctee_os_scm_resp - TrEE / TzOS SCM call response. + * @status: Status of the SCM call. See &enum qctee_os_scm_result. + * @resp_type: Type of the response. See &enum qctee_os_scm_resp_type. + * @data: Response data. The type of this data is given in @resp_type. + */ +struct qctee_os_scm_resp { + u64 status; + u64 resp_type; + u64 data; +}; + +int qctee_os_scm_call(struct device *dev, const struct qcom_scm_desc *desc, + struct qctee_os_scm_resp *res); + + +/* -- Secure App interface. ------------------------------------------------- */ + +#define QCTEE_MAX_APP_NAME_SIZE 64 + +int qctee_app_get_id(struct device *dev, const char *app_name, u32 *app_id); +int qctee_app_send(struct device *dev, u32 app_id, struct qctee_dma *req, struct qctee_dma *rsp); + +#endif /* _LINUX_QCOM_TEE_H */ -- 2.37.1