OP-TEE March 2022

op-tee@lists.trustedfirmware.org

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15 discussions

[PATCH v2] rtc: optee: add RTC driver for OP-TEE RTC PTA

by Clément Léger

This drivers allows to communicate with a RTC PTA handled by OP-TEE [1]. This PTA allows to query RTC information, set/get time and set/get offset depending on the supported features. [1] https://github.com/OP-TEE/optee_os/pull/5179 Signed-off-by: Clément Léger <clement.leger(a)bootlin.com> --- Changes in v2: - Rebased over tee-shm-for-v5.18 - Switch to tee_shm_alloc_kernel_buf() - Use export_uuid() to copy uuid - Fix warnings reported by checkpatch - Free SHM in error exit path - Fix error messages to include ret value and fix wrong IOCTL names - Use 100 columns char limit MAINTAINERS | 6 + drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-optee.c | 386 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 403 insertions(+) create mode 100644 drivers/rtc/rtc-optee.c diff --git a/MAINTAINERS b/MAINTAINERS index f41088418aae..b21375ad73d2 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14361,6 +14361,12 @@ L: op-tee(a)lists.trustedfirmware.org S: Maintained F: drivers/char/hw_random/optee-rng.c +OP-TEE RTC DRIVER +M: Clément Léger <clement.leger(a)bootlin.com> +L: linux-rtc(a)vger.kernel.org +S: Maintained +F: drivers/rtc/rtc-optee.c + OPA-VNIC DRIVER M: Dennis Dalessandro <dennis.dalessandro(a)cornelisnetworks.com> M: Mike Marciniszyn <mike.marciniszyn(a)cornelisnetworks.com> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index d85a3c31347c..cba5427f79b3 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1293,6 +1293,16 @@ config RTC_DRV_OPAL This driver can also be built as a module. If so, the module will be called rtc-opal. +config RTC_DRV_OPTEE + tristate "OP-TEE based RTC driver" + depends on OPTEE + help + Select this to get support for OP-TEE based RTC control on SoCs where + RTC are not accessible to the normal world (Linux). + + This driver can also be built as a module. If so, the module + will be called rtc-optee. + config RTC_DRV_ZYNQMP tristate "Xilinx Zynq Ultrascale+ MPSoC RTC" depends on OF && HAS_IOMEM diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index e92f3e943245..2d827d8261d5 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -115,6 +115,7 @@ obj-$(CONFIG_RTC_DRV_GAMECUBE) += rtc-gamecube.o obj-$(CONFIG_RTC_DRV_NTXEC) += rtc-ntxec.o obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o obj-$(CONFIG_RTC_DRV_OPAL) += rtc-opal.o +obj-$(CONFIG_RTC_DRV_OPTEE) += rtc-optee.o obj-$(CONFIG_RTC_DRV_PALMAS) += rtc-palmas.o obj-$(CONFIG_RTC_DRV_PCAP) += rtc-pcap.o obj-$(CONFIG_RTC_DRV_PCF2123) += rtc-pcf2123.o diff --git a/drivers/rtc/rtc-optee.c b/drivers/rtc/rtc-optee.c new file mode 100644 index 000000000000..a2865ed17cfc --- /dev/null +++ b/drivers/rtc/rtc-optee.c @@ -0,0 +1,386 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2022 Microchip. + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/rtc.h> +#include <linux/tee_drv.h> + +#define RTC_INFO_VERSION 0x1 + +#define TA_CMD_RTC_GET_INFO 0x0 +#define TA_CMD_RTC_GET_TIME 0x1 +#define TA_CMD_RTC_SET_TIME 0x2 +#define TA_CMD_RTC_GET_OFFSET 0x3 +#define TA_CMD_RTC_SET_OFFSET 0x4 + +#define TA_RTC_FEATURE_CORRECTION BIT(0) + +struct optee_rtc_time { + u32 tm_sec; + u32 tm_min; + u32 tm_hour; + u32 tm_mday; + u32 tm_mon; + u32 tm_year; + u32 tm_wday; +}; + +struct optee_rtc_info { + u64 version; + u64 features; + struct optee_rtc_time range_min; + struct optee_rtc_time range_max; +}; + +/** + * struct optee_rtc - OP-TEE RTC private data + * @dev: OP-TEE based RTC device. + * @ctx: OP-TEE context handler. + * @session_id: RTC TA session identifier. + * @shm: Memory pool shared with RTC device. + * @features: Bitfield of RTC features + */ +struct optee_rtc { + struct device *dev; + struct tee_context *ctx; + u32 session_id; + struct tee_shm *shm; + u64 features; +}; + +static int optee_rtc_readtime(struct device *dev, struct rtc_time *tm) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct optee_rtc_time *optee_tm; + struct tee_param param[4] = {0}; + int ret; + + inv_arg.func = TA_CMD_RTC_GET_TIME; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + /* Fill invoke cmd params */ + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT; + param[0].u.memref.shm = priv->shm; + param[0].u.memref.size = sizeof(struct optee_rtc_time); + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_GET_TIME invoke ret: %d, tee ret: %x\n", ret, inv_arg.ret); + return ret ? ret : -EPROTO; + } + + optee_tm = tee_shm_get_va(priv->shm, 0); + if (IS_ERR(optee_tm)) { + dev_err(dev, "tee_shm_get_va failed\n"); + return PTR_ERR(optee_tm); + } + + if (param[0].u.memref.size != sizeof(*optee_tm)) { + dev_err(dev, "Invalid read size from OPTEE\n"); + return -EPROTO; + } + + tm->tm_sec = optee_tm->tm_sec; + tm->tm_min = optee_tm->tm_min; + tm->tm_hour = optee_tm->tm_hour; + tm->tm_mday = optee_tm->tm_mday; + tm->tm_mon = optee_tm->tm_mon; + tm->tm_year = optee_tm->tm_year - 1900; + tm->tm_wday = optee_tm->tm_wday; + tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); + + return 0; +} + +static int optee_rtc_settime(struct device *dev, struct rtc_time *tm) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct tee_param param[4] = {0}; + struct optee_rtc_time optee_tm; + void *rtc_data; + int ret; + + optee_tm.tm_sec = tm->tm_sec; + optee_tm.tm_min = tm->tm_min; + optee_tm.tm_hour = tm->tm_hour; + optee_tm.tm_mday = tm->tm_mday; + optee_tm.tm_mon = tm->tm_mon; + optee_tm.tm_year = tm->tm_year + 1900; + optee_tm.tm_wday = tm->tm_wday; + + inv_arg.func = TA_CMD_RTC_SET_TIME; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT; + param[0].u.memref.shm = priv->shm; + param[0].u.memref.size = sizeof(struct optee_rtc_time); + + rtc_data = tee_shm_get_va(priv->shm, 0); + if (IS_ERR(rtc_data)) { + dev_err(dev, "tee_shm_get_va failed\n"); + return PTR_ERR(rtc_data); + } + + memcpy(rtc_data, &optee_tm, sizeof(struct optee_rtc_time)); + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_SET_TIME invoke ret: %d, tee ret: %x\n", ret, inv_arg.ret); + return ret ? ret : -EPROTO; + } + + return 0; +} + +static int optee_rtc_readoffset(struct device *dev, long *offset) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct tee_param param[4] = {0}; + int ret; + + if (!(priv->features & TA_RTC_FEATURE_CORRECTION)) + return -EOPNOTSUPP; + + inv_arg.func = TA_CMD_RTC_GET_OFFSET; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT; + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_GET_OFFSET invoke ret: %d, tee ret: %x\n", ret, + inv_arg.ret); + return ret ? ret : -EPROTO; + } + + *offset = param[0].u.value.a; + + return 0; +} + +static int optee_rtc_setoffset(struct device *dev, long offset) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct tee_param param[4] = {0}; + int ret; + + if (!(priv->features & TA_RTC_FEATURE_CORRECTION)) + return -EOPNOTSUPP; + + inv_arg.func = TA_CMD_RTC_SET_OFFSET; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT; + param[0].u.value.a = offset; + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_SET_OFFSET invoke ret: %d, tee ret: %x\n", ret, + inv_arg.ret); + return ret ? ret : -EPROTO; + } + + return 0; +} + +static const struct rtc_class_ops optee_rtc_ops = { + .read_time = optee_rtc_readtime, + .set_time = optee_rtc_settime, + .set_offset = optee_rtc_setoffset, + .read_offset = optee_rtc_readoffset, +}; + +static int optee_rtc_read_info(struct device *dev, struct rtc_device *rtc, + u64 *features) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct tee_param param[4] = {0}; + struct optee_rtc_info *info; + struct optee_rtc_time *tm; + int ret; + + inv_arg.func = TA_CMD_RTC_GET_INFO; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT; + param[0].u.memref.shm = priv->shm; + param[0].u.memref.size = sizeof(*info); + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_GET_INFO invoke ret: %d, tee ret: %x\n", ret, inv_arg.ret); + return -EINVAL; + } + + info = tee_shm_get_va(priv->shm, 0); + if (IS_ERR(info)) { + dev_err(dev, "tee_shm_get_va failed\n"); + return PTR_ERR(info); + } + + if (param[0].u.memref.size != sizeof(*info)) { + dev_err(dev, "Invalid read size from OPTEE\n"); + return -EPROTO; + } + + if (info->version != RTC_INFO_VERSION) { + dev_err(dev, "Unsupported information version %llu\n", info->version); + return -EPROTO; + } + + *features = info->features; + + tm = &info->range_min; + rtc->range_min = mktime64(tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, + tm->tm_sec); + tm = &info->range_max; + rtc->range_max = mktime64(tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, + tm->tm_sec); + + return 0; +} + +static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data) +{ + if (ver->impl_id == TEE_IMPL_ID_OPTEE) + return 1; + else + return 0; +} + +static int optee_rtc_probe(struct device *dev) +{ + struct tee_client_device *rtc_device = to_tee_client_device(dev); + struct tee_ioctl_open_session_arg sess_arg; + struct optee_rtc *priv; + struct rtc_device *rtc; + struct tee_shm *shm; + int ret, err; + + memset(&sess_arg, 0, sizeof(sess_arg)); + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + rtc = devm_rtc_allocate_device(dev); + if (IS_ERR(rtc)) + return PTR_ERR(rtc); + + /* Open context with TEE driver */ + priv->ctx = tee_client_open_context(NULL, optee_ctx_match, NULL, NULL); + if (IS_ERR(priv->ctx)) + return -ENODEV; + + /* Open session with rtc Trusted App */ + export_uuid(sess_arg.uuid, &rtc_device->id.uuid); + sess_arg.clnt_login = TEE_IOCTL_LOGIN_REE_KERNEL; + + ret = tee_client_open_session(priv->ctx, &sess_arg, NULL); + if (ret < 0 || sess_arg.ret != 0) { + dev_err(dev, "tee_client_open_session failed, err: %x\n", sess_arg.ret); + err = -EINVAL; + goto out_ctx; + } + priv->session_id = sess_arg.session; + + shm = tee_shm_alloc_kernel_buf(priv->ctx, sizeof(struct optee_rtc_info)); + if (IS_ERR(shm)) { + dev_err(priv->dev, "tee_shm_alloc_kernel_buf failed\n"); + err = PTR_ERR(shm); + goto out_sess; + } + + priv->shm = shm; + priv->dev = dev; + dev_set_drvdata(dev, priv); + + rtc->ops = &optee_rtc_ops; + + err = optee_rtc_read_info(dev, rtc, &priv->features); + if (err) { + dev_err(dev, "Failed to get RTC features from OP-TEE\n"); + goto out_shm; + } + + err = devm_rtc_register_device(rtc); + if (err) + goto out_shm; + + /* + * We must clear this bit after registering because rtc_register_device + * will set it if it sees that .set_offset is provided. + */ + if (!(priv->features & TA_RTC_FEATURE_CORRECTION)) + clear_bit(RTC_FEATURE_CORRECTION, rtc->features); + + return 0; + +out_shm: + tee_shm_free(priv->shm); +out_sess: + tee_client_close_session(priv->ctx, priv->session_id); +out_ctx: + tee_client_close_context(priv->ctx); + + return err; +} + +static int optee_rtc_remove(struct device *dev) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + + tee_client_close_session(priv->ctx, priv->session_id); + tee_client_close_context(priv->ctx); + + return 0; +} + +static const struct tee_client_device_id optee_rtc_id_table[] = { + {UUID_INIT(0xf389f8c8, 0x845f, 0x496c, + 0x8b, 0xbe, 0xd6, 0x4b, 0xd2, 0x4c, 0x92, 0xfd)}, + {} +}; + +MODULE_DEVICE_TABLE(tee, optee_rtc_id_table); + +static struct tee_client_driver optee_rtc_driver = { + .id_table = optee_rtc_id_table, + .driver = { + .name = "optee_rtc", + .bus = &tee_bus_type, + .probe = optee_rtc_probe, + .remove = optee_rtc_remove, + }, +}; + +static int __init optee_rtc_mod_init(void) +{ + return driver_register(&optee_rtc_driver.driver); +} + +static void __exit optee_rtc_mod_exit(void) +{ + driver_unregister(&optee_rtc_driver.driver); +} + +module_init(optee_rtc_mod_init); +module_exit(optee_rtc_mod_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Clément Léger <clement.leger(a)bootlin.com>"); +MODULE_DESCRIPTION("OP-TEE based RTC driver"); -- 2.34.1

2 years, 8 months

[PATCH v2] rtc: optee: add RTC driver for OP-TEE RTC PTA

by Clément Léger

This drivers allows to communicate with a RTC PTA handled by OP-TEE [1]. This PTA allows to query RTC information, set/get time and set/get offset depending on the supported features. [1] https://github.com/OP-TEE/optee_os/pull/5179 Signed-off-by: Clément Léger <clement.leger(a)bootlin.com> --- Changes in v2: - Rebased over tee-shm-for-v5.18 - Switch to tee_shm_alloc_kernel_buf() - Use export_uuid() to copy uuid - Fix warnings reported by checkpatch - Free SHM in error exit path MAINTAINERS | 6 + drivers/rtc/Kconfig | 10 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-optee.c | 396 ++++++++++++++++++++++++++++++++++++++++ 4 files changed, 413 insertions(+) create mode 100644 drivers/rtc/rtc-optee.c diff --git a/MAINTAINERS b/MAINTAINERS index f41088418aae..b21375ad73d2 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14361,6 +14361,12 @@ L: op-tee(a)lists.trustedfirmware.org S: Maintained F: drivers/char/hw_random/optee-rng.c +OP-TEE RTC DRIVER +M: Clément Léger <clement.leger(a)bootlin.com> +L: linux-rtc(a)vger.kernel.org +S: Maintained +F: drivers/rtc/rtc-optee.c + OPA-VNIC DRIVER M: Dennis Dalessandro <dennis.dalessandro(a)cornelisnetworks.com> M: Mike Marciniszyn <mike.marciniszyn(a)cornelisnetworks.com> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index d85a3c31347c..b10d88db8e9c 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1293,6 +1293,16 @@ config RTC_DRV_OPAL This driver can also be built as a module. If so, the module will be called rtc-opal. +config RTC_DRV_OPTEE + tristate "OP-TEE based RTC driver" + depends on OPTEE + help + Select this to get support for OP-TEE based RTC control on ARM SoCs + where RTC are not accessible to the normal world (Linux). + + This driver can also be built as a module. If so, the module + will be called rtc-optee. + config RTC_DRV_ZYNQMP tristate "Xilinx Zynq Ultrascale+ MPSoC RTC" depends on OF && HAS_IOMEM diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index e92f3e943245..2d827d8261d5 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -115,6 +115,7 @@ obj-$(CONFIG_RTC_DRV_GAMECUBE) += rtc-gamecube.o obj-$(CONFIG_RTC_DRV_NTXEC) += rtc-ntxec.o obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o obj-$(CONFIG_RTC_DRV_OPAL) += rtc-opal.o +obj-$(CONFIG_RTC_DRV_OPTEE) += rtc-optee.o obj-$(CONFIG_RTC_DRV_PALMAS) += rtc-palmas.o obj-$(CONFIG_RTC_DRV_PCAP) += rtc-pcap.o obj-$(CONFIG_RTC_DRV_PCF2123) += rtc-pcf2123.o diff --git a/drivers/rtc/rtc-optee.c b/drivers/rtc/rtc-optee.c new file mode 100644 index 000000000000..7177c9d4675a --- /dev/null +++ b/drivers/rtc/rtc-optee.c @@ -0,0 +1,396 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2022 Microchip. + */ + +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/rtc.h> +#include <linux/tee_drv.h> + +#define RTC_INFO_VERSION 0x1 + +#define TA_CMD_RTC_GET_INFO 0x0 +#define TA_CMD_RTC_GET_TIME 0x1 +#define TA_CMD_RTC_SET_TIME 0x2 +#define TA_CMD_RTC_GET_OFFSET 0x3 +#define TA_CMD_RTC_SET_OFFSET 0x4 + +#define TA_RTC_FEATURE_CORRECTION BIT(0) + +struct optee_rtc_time { + u32 tm_sec; + u32 tm_min; + u32 tm_hour; + u32 tm_mday; + u32 tm_mon; + u32 tm_year; + u32 tm_wday; +}; + +struct optee_rtc_info { + u64 version; + u64 features; + struct optee_rtc_time range_min; + struct optee_rtc_time range_max; +}; + +/** + * struct optee_rtc - OP-TEE RTC private data + * @dev: OP-TEE based RTC device. + * @ctx: OP-TEE context handler. + * @session_id: RTC TA session identifier. + * @shm: Memory pool shared with RTC device. + * @features: Bitfield of RTC features + */ +struct optee_rtc { + struct device *dev; + struct tee_context *ctx; + u32 session_id; + struct tee_shm *shm; + u64 features; +}; + +static int optee_rtc_readtime(struct device *dev, struct rtc_time *tm) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct optee_rtc_time *optee_tm; + struct tee_param param[4] = {0}; + int ret; + + inv_arg.func = TA_CMD_RTC_GET_TIME; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + /* Fill invoke cmd params */ + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT; + param[0].u.memref.shm = priv->shm; + param[0].u.memref.size = sizeof(struct optee_rtc_time); + param[0].u.memref.shm_offs = 0; + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_GET_TIME invoke err: %x\n", + inv_arg.ret); + return ret; + } + + optee_tm = tee_shm_get_va(priv->shm, 0); + if (IS_ERR(optee_tm)) { + dev_err(dev, "tee_shm_get_va failed\n"); + return PTR_ERR(optee_tm); + } + + if (param[0].u.memref.size != sizeof(*optee_tm)) { + dev_err(dev, "Invalid read size from OPTEE\n"); + return -EINVAL; + } + + tm->tm_sec = optee_tm->tm_sec; + tm->tm_min = optee_tm->tm_min; + tm->tm_hour = optee_tm->tm_hour; + tm->tm_mday = optee_tm->tm_mday; + tm->tm_mon = optee_tm->tm_mon; + tm->tm_year = optee_tm->tm_year - 1900; + tm->tm_wday = optee_tm->tm_wday; + tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year); + + return 0; +} + +static int optee_rtc_settime(struct device *dev, struct rtc_time *tm) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct tee_param param[4] = {0}; + struct optee_rtc_time optee_tm; + void *rtc_data; + int ret; + + optee_tm.tm_sec = tm->tm_sec; + optee_tm.tm_min = tm->tm_min; + optee_tm.tm_hour = tm->tm_hour; + optee_tm.tm_mday = tm->tm_mday; + optee_tm.tm_mon = tm->tm_mon; + optee_tm.tm_year = tm->tm_year + 1900; + optee_tm.tm_wday = tm->tm_wday; + + inv_arg.func = TA_CMD_RTC_SET_TIME; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT; + param[0].u.memref.shm = priv->shm; + param[0].u.memref.size = sizeof(struct optee_rtc_time); + param[0].u.memref.shm_offs = 0; + + rtc_data = tee_shm_get_va(priv->shm, 0); + if (IS_ERR(rtc_data)) { + dev_err(dev, "tee_shm_get_va failed\n"); + return PTR_ERR(rtc_data); + } + + memcpy(rtc_data, &optee_tm, sizeof(struct optee_rtc_time)); + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_GET_TIME invoke err: %x\n", + inv_arg.ret); + return ret; + } + + return 0; +} + +static int optee_rtc_readoffset(struct device *dev, long *offset) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct tee_param param[4] = {0}; + int ret; + + if (!(priv->features & TA_RTC_FEATURE_CORRECTION)) + return -EOPNOTSUPP; + + inv_arg.func = TA_CMD_RTC_GET_OFFSET; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT; + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_GET_RNG_INFO invoke err: %x\n", + inv_arg.ret); + return -EINVAL; + } + + *offset = param[0].u.value.a; + + return 0; +} + +static int optee_rtc_setoffset(struct device *dev, long offset) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct tee_param param[4] = {0}; + int ret; + + if (!(priv->features & TA_RTC_FEATURE_CORRECTION)) + return -EOPNOTSUPP; + + inv_arg.func = TA_CMD_RTC_SET_OFFSET; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT; + param[0].u.value.a = offset; + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_GET_RNG_INFO invoke err: %x\n", + inv_arg.ret); + return -EINVAL; + } + + return 0; +} + +static const struct rtc_class_ops optee_rtc_ops = { + .read_time = optee_rtc_readtime, + .set_time = optee_rtc_settime, + .set_offset = optee_rtc_setoffset, + .read_offset = optee_rtc_readoffset, +}; + +static int optee_rtc_read_info(struct device *dev, struct rtc_device *rtc, + u64 *features) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + struct tee_ioctl_invoke_arg inv_arg = {0}; + struct tee_param param[4] = {0}; + struct optee_rtc_info *info; + struct optee_rtc_time *tm; + int ret; + + inv_arg.func = TA_CMD_RTC_GET_INFO; + inv_arg.session = priv->session_id; + inv_arg.num_params = 4; + + param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT; + param[0].u.memref.shm = priv->shm; + param[0].u.memref.size = sizeof(*info); + param[0].u.memref.shm_offs = 0; + + ret = tee_client_invoke_func(priv->ctx, &inv_arg, param); + if (ret < 0 || inv_arg.ret != 0) { + dev_err(dev, "TA_CMD_RTC_GET_RNG_INFO invoke err: %x\n", + inv_arg.ret); + return -EINVAL; + } + + info = tee_shm_get_va(priv->shm, 0); + if (IS_ERR(info)) { + dev_err(dev, "tee_shm_get_va failed\n"); + return PTR_ERR(info); + } + + if (param[0].u.memref.size != sizeof(*info)) { + dev_err(dev, "Invalid read size from OPTEE\n"); + return -EINVAL; + } + + if (info->version != RTC_INFO_VERSION) { + dev_err(dev, "Unsupported information version %llu\n", + info->version); + return -EINVAL; + } + + *features = info->features; + + tm = &info->range_min; + rtc->range_min = mktime64(tm->tm_year, tm->tm_mon, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec); + tm = &info->range_max; + rtc->range_max = mktime64(tm->tm_year, tm->tm_mon, tm->tm_mday, + tm->tm_hour, tm->tm_min, tm->tm_sec); + + return 0; +} + +static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data) +{ + if (ver->impl_id == TEE_IMPL_ID_OPTEE) + return 1; + else + return 0; +} + +static int optee_rtc_probe(struct device *dev) +{ + struct tee_client_device *rtc_device = to_tee_client_device(dev); + struct tee_ioctl_open_session_arg sess_arg; + struct optee_rtc *priv; + struct rtc_device *rtc; + struct tee_shm *shm; + int ret, err; + + memset(&sess_arg, 0, sizeof(sess_arg)); + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + rtc = devm_rtc_allocate_device(dev); + if (IS_ERR(rtc)) + return PTR_ERR(rtc); + + /* Open context with TEE driver */ + priv->ctx = tee_client_open_context(NULL, optee_ctx_match, NULL, NULL); + if (IS_ERR(priv->ctx)) + return -ENODEV; + + /* Open session with rtc Trusted App */ + export_uuid(sess_arg.uuid, &rtc_device->id.uuid); + sess_arg.clnt_login = TEE_IOCTL_LOGIN_REE_KERNEL; + sess_arg.num_params = 0; + + ret = tee_client_open_session(priv->ctx, &sess_arg, NULL); + if (ret < 0 || sess_arg.ret != 0) { + dev_err(dev, "tee_client_open_session failed, err: %x\n", + sess_arg.ret); + err = -EINVAL; + goto out_ctx; + } + priv->session_id = sess_arg.session; + + shm = tee_shm_alloc_kernel_buf(priv->ctx, + sizeof(struct optee_rtc_info)); + if (IS_ERR(shm)) { + dev_err(priv->dev, "tee_shm_alloc failed\n"); + err = PTR_ERR(shm); + goto out_sess; + } + + priv->shm = shm; + priv->dev = dev; + dev_set_drvdata(dev, priv); + + rtc->ops = &optee_rtc_ops; + + err = optee_rtc_read_info(dev, rtc, &priv->features); + if (err) { + dev_err(dev, "Failed to get RTC features from OP-TEE\n"); + goto out_shm; + } + + err = devm_rtc_register_device(rtc); + if (err) + goto out_shm; + + /* + * We must clear this bit after registering because rtc_register_device + * will set it if it sees that .set_offset is provided. + */ + if (!(priv->features & TA_RTC_FEATURE_CORRECTION)) + clear_bit(RTC_FEATURE_CORRECTION, rtc->features); + + return 0; + +out_shm: + tee_shm_free(priv->shm); +out_sess: + tee_client_close_session(priv->ctx, priv->session_id); +out_ctx: + tee_client_close_context(priv->ctx); + + return err; +} + +static int optee_rtc_remove(struct device *dev) +{ + struct optee_rtc *priv = dev_get_drvdata(dev); + + tee_client_close_session(priv->ctx, priv->session_id); + tee_client_close_context(priv->ctx); + + return 0; +} + +static const struct tee_client_device_id optee_rtc_id_table[] = { + {UUID_INIT(0xf389f8c8, 0x845f, 0x496c, + 0x8b, 0xbe, 0xd6, 0x4b, 0xd2, 0x4c, 0x92, 0xfd)}, + {} +}; + +MODULE_DEVICE_TABLE(tee, optee_rtc_id_table); + +static struct tee_client_driver optee_rtc_driver = { + .id_table = optee_rtc_id_table, + .driver = { + .name = "optee_rtc", + .bus = &tee_bus_type, + .probe = optee_rtc_probe, + .remove = optee_rtc_remove, + }, +}; + +static int __init optee_rtc_mod_init(void) +{ + return driver_register(&optee_rtc_driver.driver); +} + +static void __exit optee_rtc_mod_exit(void) +{ + driver_unregister(&optee_rtc_driver.driver); +} + +module_init(optee_rtc_mod_init); +module_exit(optee_rtc_mod_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Clément Léger <clement.leger(a)bootlin.com>"); +MODULE_DESCRIPTION("OP-TEE based RTC driver"); -- 2.34.1

2 years, 8 months

Secure Storage Applications

by Manorit Chawdhry

Hi, I have been exploring secure storage in OP-TEE for a few days and I need some help in putting some files into it. I have been trying to find some tool which could help me put any files from Linux into secure storage and retrieve them back later so that I could see secure storage in action but haven't been able to find any yet. Is there any tool which you guys might know of which helps put files in secure storage and retrieve them back later? Best Regards, Manorit

2 years, 8 months

[PATCH v4 00/10] tee: shared memory updates

by Jens Wiklander

Hi all, This patchset is a general cleanup of shared memory handling in the TEE subsystem. Until now has the in-kernel tee clients used tee_shm_alloc() and tee_shm_register() to share memory with secure world. These two function exposes via a flags parameter a bit more of the internals of the TEE subsystem than one would like. So in order to make things easier are those two functions replaced by few functions which should provide better abstraction. Two in-kernel tee clients are updated to use these new functions. The shared memory pool handling is simplified, an internal matter for the two TEE drivers OP-TEE and AMDTEE. In the v3 review it was suggested [1] to break out "optee: add driver private tee_context" and "optee: use driver internal tee_contex for some rpc" into a separate patch to fix to allow those a faster path upstream as they fix reported problems. So this patchset is now rebased on top of those patches separated. This patchset is based on [2] and is also available at [3]. Thanks, Jens [1] https://lore.kernel.org/lkml/20220125162938.838382-1-jens.wiklander@linaro.… [2] https://git.linaro.org/people/jens.wiklander/linux-tee.git/log/?h=fixes [3] https://git.linaro.org/people/jens.wiklander/linux-tee.git/log/?h=tee_shm_v4 v3->v4: * Broke out "optee: add driver private tee_context" and "optee: use driver internal tee_contex for some rpc" into a separate patch as that fixes earlier reported issues and deserves a to go into v5.17 and stable trees. * Rebased on the recent fixes for the OP-TEE driver on top of v5.17-rc2 * All patches are now reviewed by Sumit Garg + some small fixes from the last review v2->v3: * Make tee_shm_alloc_user_buf() and tee_shm_register_user_buf() internal and don't export them to the drivers. * Rename tee_shm_alloc_priv_kernel_buf() to tee_shm_alloc_priv_buf() * Adressing comments on variable names and choice of types in "tee: replace tee_shm_register()" * Adding detailed explaination on alignment in "tee: simplify shm pool handling" * Added Sumits R-B on a few of the patches v1->v2: * The commits three "tee: add tee_shm_alloc_kernel_buf()", "tpm_ftpm_tee: use tee_shm_alloc_kernel_buf()" and "firmware: tee_bnxt: use tee_shm_alloc_kernel_buf()" has been merged some time ago as part of another patchset. * Another in-kernel tee client is updated with the commit "KEYS: trusted: tee: use tee_shm_register_kernel_buf()" * tee_shm_alloc_anon_kernel_buf() is replaced with an easier to use function tee_shm_alloc_priv_kernel_buf() and tee_shm_free_anon_kernel_buf() has been dropped. * A driver internal struct tee_context is used to when doing driver internal calls to secure world. * Adds patches to replace tee_shm_register() in a similar way as how tee_shm_alloc() is replaced. * A patch is added to clean up the TEE_SHM_* flags * Fixed a warning reported by kernel test robot <lkp(a)intel.com> Jens Wiklander (10): hwrng: optee-rng: use tee_shm_alloc_kernel_buf() tee: remove unused tee_shm_pool_alloc_res_mem() tee: add tee_shm_alloc_user_buf() tee: simplify shm pool handling tee: replace tee_shm_alloc() optee: add optee_pool_op_free_helper() tee: add tee_shm_register_{user,kernel}_buf() KEYS: trusted: tee: use tee_shm_register_kernel_buf() tee: replace tee_shm_register() tee: refactor TEE_SHM_* flags drivers/char/hw_random/optee-rng.c | 6 +- drivers/tee/amdtee/shm_pool.c | 55 ++-- drivers/tee/optee/Kconfig | 8 - drivers/tee/optee/call.c | 2 +- drivers/tee/optee/core.c | 21 +- drivers/tee/optee/device.c | 5 +- drivers/tee/optee/ffa_abi.c | 63 ++--- drivers/tee/optee/optee_private.h | 7 +- drivers/tee/optee/smc_abi.c | 125 +++------ drivers/tee/tee_core.c | 5 +- drivers/tee/tee_private.h | 15 +- drivers/tee/tee_shm.c | 320 +++++++++++++++-------- drivers/tee/tee_shm_pool.c | 162 +++--------- include/linux/tee_drv.h | 138 +++------- security/keys/trusted-keys/trusted_tee.c | 23 +- 15 files changed, 388 insertions(+), 567 deletions(-) -- 2.31.1

2 years, 8 months

OP-TEE S-EL1 SPMC status

by Jelle Sels

Hi all, As part of Trusted Services project we are extending OP-TEE to be a full complaint FF-A S-EL1 SPMC. This work is still on going but some of the Trusted Services applications are already compatible. We created https://developer.trustedfirmware.org/w/trusted-services/op-tee-spmc/ which gives the current status of the SPMC work and can be a starting point for everyone who wants to get started with the Trusted Services or OP-TEE as a S-EL1 SPMC. Please feel free to ask any questions on the Trusted Service and the OP-TEE mailing list. https://lists.trustedfirmware.org/mailman3/lists/trusted-services.lists.tru… https://lists.trustedfirmware.org/mailman3/lists/op-tee.lists.trustedfirmwa… Regards, Jelle

2 years, 8 months

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OP-TEE March 2022