[PATCH v10 08/11] tee: add Qualcomm TEE driver

Introduce qcomtee_object, which represents an object in both QTEE and the kernel. QTEE clients can invoke an instance of qcomtee_object to access QTEE services. If this invocation produces a new object in QTEE, an instance of qcomtee_object will be returned.

Similarly, QTEE can request services from by issuing a callback request, which invokes an instance of qcomtee_object.

Implement initial support for exporting qcomtee_object to userspace and QTEE, enabling the invocation of objects hosted in QTEE and userspace through the TEE subsystem.

Tested-by: Neil Armstrong neil.armstrong@linaro.org Tested-by: Harshal Dev quic_hdev@quicinc.com Acked-by: Sumit Garg sumit.garg@oss.qualcomm.com Signed-off-by: Amirreza Zarrabi amirreza.zarrabi@oss.qualcomm.com --- MAINTAINERS | 6 + drivers/tee/Kconfig | 1 + drivers/tee/Makefile | 1 + drivers/tee/qcomtee/Kconfig | 12 + drivers/tee/qcomtee/Makefile | 7 + drivers/tee/qcomtee/async.c | 182 +++++++ drivers/tee/qcomtee/call.c | 813 +++++++++++++++++++++++++++++++ drivers/tee/qcomtee/core.c | 906 +++++++++++++++++++++++++++++++++++ drivers/tee/qcomtee/qcomtee.h | 143 ++++++ drivers/tee/qcomtee/qcomtee_msg.h | 304 ++++++++++++ drivers/tee/qcomtee/qcomtee_object.h | 316 ++++++++++++ drivers/tee/qcomtee/shm.c | 153 ++++++ drivers/tee/qcomtee/user_obj.c | 692 ++++++++++++++++++++++++++ include/uapi/linux/tee.h | 1 + 14 files changed, 3537 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS index 27811a24573f..5086db700aeb 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -20980,6 +20980,12 @@ F: Documentation/networking/device_drivers/cellular/qualcomm/rmnet.rst F: drivers/net/ethernet/qualcomm/rmnet/ F: include/linux/if_rmnet.h

+QUALCOMM TEE (QCOMTEE) DRIVER +M: Amirreza Zarrabi amirreza.zarrabi@oss.qualcomm.com +L: linux-arm-msm@vger.kernel.org +S: Maintained +F: drivers/tee/qcomtee/ + QUALCOMM TRUST ZONE MEMORY ALLOCATOR M: Bartosz Golaszewski bartosz.golaszewski@linaro.org L: linux-arm-msm@vger.kernel.org diff --git a/drivers/tee/Kconfig b/drivers/tee/Kconfig index a84767940fbf..7e89615a25a4 100644 --- a/drivers/tee/Kconfig +++ b/drivers/tee/Kconfig @@ -15,5 +15,6 @@ if TEE source "drivers/tee/optee/Kconfig" source "drivers/tee/amdtee/Kconfig" source "drivers/tee/tstee/Kconfig" +source "drivers/tee/qcomtee/Kconfig"

endif diff --git a/drivers/tee/Makefile b/drivers/tee/Makefile index 5488cba30bd2..74e987f8f7ea 100644 --- a/drivers/tee/Makefile +++ b/drivers/tee/Makefile @@ -6,3 +6,4 @@ tee-objs += tee_shm_pool.o obj-$(CONFIG_OPTEE) += optee/ obj-$(CONFIG_AMDTEE) += amdtee/ obj-$(CONFIG_ARM_TSTEE) += tstee/ +obj-$(CONFIG_QCOMTEE) += qcomtee/ diff --git a/drivers/tee/qcomtee/Kconfig b/drivers/tee/qcomtee/Kconfig new file mode 100644 index 000000000000..927686abceb1 --- /dev/null +++ b/drivers/tee/qcomtee/Kconfig @@ -0,0 +1,12 @@ +# SPDX-License-Identifier: GPL-2.0-only +# Qualcomm Trusted Execution Environment Configuration +config QCOMTEE + tristate "Qualcomm TEE Support" + depends on !CPU_BIG_ENDIAN + select QCOM_SCM + select QCOM_TZMEM_MODE_SHMBRIDGE + help + This option enables the Qualcomm Trusted Execution Environment (QTEE) + driver. It provides an API to access services offered by QTEE and + its loaded Trusted Applications (TAs). Additionally, it facilitates + the export of userspace services provided by supplicants to QTEE. diff --git a/drivers/tee/qcomtee/Makefile b/drivers/tee/qcomtee/Makefile new file mode 100644 index 000000000000..600af2b8f1c1 --- /dev/null +++ b/drivers/tee/qcomtee/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_QCOMTEE) += qcomtee.o +qcomtee-objs += async.o +qcomtee-objs += call.o +qcomtee-objs += core.o +qcomtee-objs += shm.o +qcomtee-objs += user_obj.o diff --git a/drivers/tee/qcomtee/async.c b/drivers/tee/qcomtee/async.c new file mode 100644 index 000000000000..31bff4309e67 --- /dev/null +++ b/drivers/tee/qcomtee/async.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include "qcomtee.h" + +#define QCOMTEE_ASYNC_VERSION_1_0 0x00010000U /* Maj: 0x0001, Min: 0x0000. */ +#define QCOMTEE_ASYNC_VERSION_1_1 0x00010001U /* Maj: 0x0001, Min: 0x0001. */ +#define QCOMTEE_ASYNC_VERSION_1_2 0x00010002U /* Maj: 0x0001, Min: 0x0002. */ +#define QCOMTEE_ASYNC_VERSION_CURRENT QCOMTEE_ASYNC_VERSION_1_2 + +#define QCOMTEE_ASYNC_VERSION_MAJOR(n) upper_16_bits(n) +#define QCOMTEE_ASYNC_VERSION_MINOR(n) lower_16_bits(n) + +#define QCOMTEE_ASYNC_VERSION_CURRENT_MAJOR \ + QCOMTEE_ASYNC_VERSION_MAJOR(QCOMTEE_ASYNC_VERSION_CURRENT) +#define QCOMTEE_ASYNC_VERSION_CURRENT_MINOR \ + QCOMTEE_ASYNC_VERSION_MINOR(QCOMTEE_ASYNC_VERSION_CURRENT) + +/** + * struct qcomtee_async_msg_hdr - Asynchronous message header format. + * @version: current async protocol version of the remote endpoint. + * @op: async operation. + * + * @version specifies the endpoint's (QTEE or driver) supported async protocol. + * For example, if QTEE sets @version to %QCOMTEE_ASYNC_VERSION_1_1, QTEE + * handles operations supported in %QCOMTEE_ASYNC_VERSION_1_1 or + * %QCOMTEE_ASYNC_VERSION_1_0. @op determines the message format. + */ +struct qcomtee_async_msg_hdr { + u32 version; + u32 op; +}; + +/* Size of an empty async message. */ +#define QCOMTEE_ASYNC_MSG_ZERO sizeof(struct qcomtee_async_msg_hdr) + +/** + * struct qcomtee_async_release_msg - Release asynchronous message. + * @hdr: message header as &struct qcomtee_async_msg_hdr. + * @counts: number of objects in @object_ids. + * @object_ids: array of object IDs that should be released. + * + * Available in Maj = 0x0001, Min >= 0x0000. + */ +struct qcomtee_async_release_msg { + struct qcomtee_async_msg_hdr hdr; + u32 counts; + u32 object_ids[] __counted_by(counts); +}; + +/** + * qcomtee_get_async_buffer() - Get the start of the asynchronous message. + * @oic: context used for the current invocation. + * @async_buffer: return buffer to extract from or fill in async messages. + * + * If @oic is used for direct object invocation, the whole outbound buffer + * is available for the async message. If @oic is used for a callback request, + * the tail of the outbound buffer (after the callback request message) is + * available for the async message. + * + * The start of the async buffer is aligned, see qcomtee_msg_offset_align(). + */ +static void qcomtee_get_async_buffer(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_buffer *async_buffer) +{ + struct qcomtee_msg_callback *msg; + unsigned int offset; + int i; + + if (!(oic->flags & QCOMTEE_OIC_FLAG_BUSY)) { + /* The outbound buffer is empty. Using the whole buffer. */ + offset = 0; + } else { + msg = (struct qcomtee_msg_callback *)oic->out_msg.addr; + + /* Start offset in a message for buffer arguments. */ + offset = qcomtee_msg_buffer_args(struct qcomtee_msg_callback, + qcomtee_msg_args(msg)); + + /* Add size of IB arguments. */ + qcomtee_msg_for_each_input_buffer(i, msg) + offset += qcomtee_msg_offset_align(msg->args[i].b.size); + + /* Add size of OB arguments. */ + qcomtee_msg_for_each_output_buffer(i, msg) + offset += qcomtee_msg_offset_align(msg->args[i].b.size); + } + + async_buffer->addr = oic->out_msg.addr + offset; + async_buffer->size = oic->out_msg.size - offset; +} + +/** + * async_release() - Process QTEE async release requests. + * @oic: context used for the current invocation. + * @msg: async message for object release. + * @size: size of the async buffer available. + * + * Return: Size of the outbound buffer used when processing @msg. + */ +static size_t async_release(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_async_msg_hdr *async_msg, + size_t size) +{ + struct qcomtee_async_release_msg *msg; + struct qcomtee_object *object; + int i; + + msg = (struct qcomtee_async_release_msg *)async_msg; + + for (i = 0; i < msg->counts; i++) { + object = qcomtee_idx_erase(oic, msg->object_ids[i]); + qcomtee_object_put(object); + } + + return struct_size(msg, object_ids, msg->counts); +} + +/** + * qcomtee_fetch_async_reqs() - Fetch and process asynchronous messages. + * @oic: context used for the current invocation. + * + * Calls handlers to process the requested operations in the async message. + * Currently, only supports async release requests. + */ +void qcomtee_fetch_async_reqs(struct qcomtee_object_invoke_ctx *oic) +{ + struct qcomtee_async_msg_hdr *async_msg; + struct qcomtee_buffer async_buffer; + size_t consumed, used = 0; + u16 major_ver; + + qcomtee_get_async_buffer(oic, &async_buffer); + + while (async_buffer.size - used > QCOMTEE_ASYNC_MSG_ZERO) { + async_msg = (struct qcomtee_async_msg_hdr *)(async_buffer.addr + + used); + /* + * QTEE assumes that the unused space of the async buffer is + * zeroed; so if version is zero, the buffer is unused. + */ + if (async_msg->version == 0) + goto out; + + major_ver = QCOMTEE_ASYNC_VERSION_MAJOR(async_msg->version); + /* Major version mismatch is a compatibility break. */ + if (major_ver != QCOMTEE_ASYNC_VERSION_CURRENT_MAJOR) { + pr_err("Async message version mismatch (%u != %u)\n", + major_ver, QCOMTEE_ASYNC_VERSION_CURRENT_MAJOR); + + goto out; + } + + switch (async_msg->op) { + case QCOMTEE_MSG_OBJECT_OP_RELEASE: + consumed = async_release(oic, async_msg, + async_buffer.size - used); + break; + default: + pr_err("Unsupported async message %u\n", async_msg->op); + goto out; + } + + /* Supported operation but unable to parse the message. */ + if (!consumed) { + pr_err("Unable to parse async message for op %u\n", + async_msg->op); + goto out; + } + + /* Next async message. */ + used += qcomtee_msg_offset_align(consumed); + } + +out: + /* Reset the async buffer so async requests do not loop to QTEE. */ + memzero_explicit(async_buffer.addr, async_buffer.size); +} diff --git a/drivers/tee/qcomtee/call.c b/drivers/tee/qcomtee/call.c new file mode 100644 index 000000000000..33daa4d7033d --- /dev/null +++ b/drivers/tee/qcomtee/call.c @@ -0,0 +1,813 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/slab.h> +#include <linux/tee.h> +#include <linux/platform_device.h> +#include <linux/xarray.h> + +#include "qcomtee.h" + +static int find_qtee_object(struct qcomtee_object **object, unsigned long id, + struct qcomtee_context_data *ctxdata) +{ + int err = 0; + + guard(rcu)(); + /* Object release is RCU protected. */ + *object = idr_find(&ctxdata->qtee_objects_idr, id); + if (!qcomtee_object_get(*object)) + err = -EINVAL; + + return err; +} + +static void del_qtee_object(unsigned long id, + struct qcomtee_context_data *ctxdata) +{ + struct qcomtee_object *object; + + scoped_guard(mutex, &ctxdata->qtee_lock) + object = idr_remove(&ctxdata->qtee_objects_idr, id); + + qcomtee_object_put(object); +} + +/** + * qcomtee_context_add_qtee_object() - Add a QTEE object to the context. + * @param: TEE parameter representing @object. + * @object: QTEE object. + * @ctx: context to add the object. + * + * It assumes @object is %QCOMTEE_OBJECT_TYPE_TEE and the caller has already + * issued qcomtee_object_get() for @object. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_context_add_qtee_object(struct tee_param *param, + struct qcomtee_object *object, + struct tee_context *ctx) +{ + int ret; + struct qcomtee_context_data *ctxdata = ctx->data; + + scoped_guard(mutex, &ctxdata->qtee_lock) + ret = idr_alloc(&ctxdata->qtee_objects_idr, object, 0, 0, + GFP_KERNEL); + if (ret < 0) + return ret; + + param->u.objref.id = ret; + /* QTEE Object: QCOMTEE_OBJREF_FLAG_TEE set. */ + param->u.objref.flags = QCOMTEE_OBJREF_FLAG_TEE; + + return 0; +} + +/* Retrieve the QTEE object added with qcomtee_context_add_qtee_object(). */ +int qcomtee_context_find_qtee_object(struct qcomtee_object **object, + struct tee_param *param, + struct tee_context *ctx) +{ + struct qcomtee_context_data *ctxdata = ctx->data; + + return find_qtee_object(object, param->u.objref.id, ctxdata); +} + +/** + * qcomtee_context_del_qtee_object() - Delete a QTEE object from the context. + * @param: TEE parameter representing @object. + * @ctx: context for deleting the object. + * + * The @param has been initialized by qcomtee_context_add_qtee_object(). + */ +void qcomtee_context_del_qtee_object(struct tee_param *param, + struct tee_context *ctx) +{ + struct qcomtee_context_data *ctxdata = ctx->data; + /* 'qtee_objects_idr' stores QTEE objects only. */ + if (param->u.objref.flags & QCOMTEE_OBJREF_FLAG_TEE) + del_qtee_object(param->u.objref.id, ctxdata); +} + +/** + * qcomtee_objref_to_arg() - Convert OBJREF parameter to QTEE argument. + * @arg: QTEE argument. + * @param: TEE parameter. + * @ctx: context in which the conversion should happen. + * + * It assumes @param is an OBJREF. + * It does not set @arg.type; the caller should initialize it to a correct + * &enum qcomtee_arg_type value. It gets the object's refcount in @arg; + * the caller should manage to put it afterward. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_objref_to_arg(struct qcomtee_arg *arg, struct tee_param *param, + struct tee_context *ctx) +{ + int err = -EINVAL; + + arg->o = NULL_QCOMTEE_OBJECT; + /* param is a NULL object: */ + if (param->u.objref.id == TEE_OBJREF_NULL) + return 0; + + /* param is a callback object: */ + if (param->u.objref.flags & QCOMTEE_OBJREF_FLAG_USER) + err = qcomtee_user_param_to_object(&arg->o, param, ctx); + /* param is a QTEE object: */ + else if (param->u.objref.flags & QCOMTEE_OBJREF_FLAG_TEE) + err = qcomtee_context_find_qtee_object(&arg->o, param, ctx); + + /* + * For callback objects, call qcomtee_object_get() to keep a temporary + * copy for the driver, as these objects are released asynchronously + * and may disappear even before returning from QTEE. + * + * - For direct object invocations, the matching put is called in + * qcomtee_object_invoke() when parsing the QTEE response. + * - For callback responses, put is called in qcomtee_user_object_notify() + * after QTEE has received its copies. + */ + + if (!err && (typeof_qcomtee_object(arg->o) == QCOMTEE_OBJECT_TYPE_CB)) + qcomtee_object_get(arg->o); + + return err; +} + +/** + * qcomtee_objref_from_arg() - Convert QTEE argument to OBJREF param. + * @param: TEE parameter. + * @arg: QTEE argument. + * @ctx: context in which the conversion should happen. + * + * It assumes @arg is of %QCOMTEE_ARG_TYPE_IO or %QCOMTEE_ARG_TYPE_OO. + * It does not set @param.attr; the caller should initialize it to a + * correct type. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_objref_from_arg(struct tee_param *param, struct qcomtee_arg *arg, + struct tee_context *ctx) +{ + struct qcomtee_object *object = arg->o; + + switch (typeof_qcomtee_object(object)) { + case QCOMTEE_OBJECT_TYPE_NULL: + param->u.objref.id = TEE_OBJREF_NULL; + + return 0; + case QCOMTEE_OBJECT_TYPE_CB: + /* object is a callback object: */ + if (is_qcomtee_user_object(object)) + return qcomtee_user_param_from_object(param, object, + ctx); + + break; + case QCOMTEE_OBJECT_TYPE_TEE: + return qcomtee_context_add_qtee_object(param, object, ctx); + + case QCOMTEE_OBJECT_TYPE_ROOT: + default: + break; + } + + return -EINVAL; +} + +/** + * qcomtee_params_to_args() - Convert TEE parameters to QTEE arguments. + * @u: QTEE arguments. + * @params: TEE parameters. + * @num_params: number of elements in the parameter array. + * @ctx: context in which the conversion should happen. + * + * It assumes @u has at least @num_params + 1 entries and has been initialized + * with %QCOMTEE_ARG_TYPE_INV as &struct qcomtee_arg.type. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +static int qcomtee_params_to_args(struct qcomtee_arg *u, + struct tee_param *params, int num_params, + struct tee_context *ctx) +{ + int i; + + for (i = 0; i < num_params; i++) { + switch (params[i].attr) { + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT: + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT: + u[i].flags = QCOMTEE_ARG_FLAGS_UADDR; + u[i].b.uaddr = params[i].u.ubuf.uaddr; + u[i].b.size = params[i].u.ubuf.size; + + if (params[i].attr == + TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT) + u[i].type = QCOMTEE_ARG_TYPE_IB; + else /* TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT */ + u[i].type = QCOMTEE_ARG_TYPE_OB; + + break; + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT: + u[i].type = QCOMTEE_ARG_TYPE_IO; + if (qcomtee_objref_to_arg(&u[i], &params[i], ctx)) + goto out_failed; + + break; + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT: + u[i].type = QCOMTEE_ARG_TYPE_OO; + u[i].o = NULL_QCOMTEE_OBJECT; + break; + default: + goto out_failed; + } + } + + return 0; + +out_failed: + /* Undo qcomtee_objref_to_arg(). */ + for (i--; i >= 0; i--) { + if (u[i].type != QCOMTEE_ARG_TYPE_IO) + continue; + + qcomtee_user_object_set_notify(u[i].o, false); + /* See docs for qcomtee_objref_to_arg() for double put. */ + if (typeof_qcomtee_object(u[i].o) == QCOMTEE_OBJECT_TYPE_CB) + qcomtee_object_put(u[i].o); + + qcomtee_object_put(u[i].o); + } + + return -EINVAL; +} + +/** + * qcomtee_params_from_args() - Convert QTEE arguments to TEE parameters. + * @params: TEE parameters. + * @u: QTEE arguments. + * @num_params: number of elements in the parameter array. + * @ctx: context in which the conversion should happen. + * + * @u should have already been initialized by qcomtee_params_to_args(). + * This also represents the end of a QTEE invocation that started with + * qcomtee_params_to_args() by releasing %QCOMTEE_ARG_TYPE_IO objects. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +static int qcomtee_params_from_args(struct tee_param *params, + struct qcomtee_arg *u, int num_params, + struct tee_context *ctx) +{ + int i, np; + + qcomtee_arg_for_each(np, u) { + switch (u[np].type) { + case QCOMTEE_ARG_TYPE_OB: + /* TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT */ + params[np].u.ubuf.size = u[np].b.size; + + break; + case QCOMTEE_ARG_TYPE_IO: + /* IEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT */ + qcomtee_object_put(u[np].o); + + break; + case QCOMTEE_ARG_TYPE_OO: + /* TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT */ + if (qcomtee_objref_from_arg(&params[np], &u[np], ctx)) + goto out_failed; + + break; + case QCOMTEE_ARG_TYPE_IB: + default: + break; + } + } + + return 0; + +out_failed: + /* Undo qcomtee_objref_from_arg(). */ + for (i = 0; i < np; i++) { + if (params[i].attr == TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT) + qcomtee_context_del_qtee_object(&params[i], ctx); + } + + /* Release any IO and OO objects not processed. */ + for (; u[i].type && i < num_params; i++) { + if (u[i].type == QCOMTEE_ARG_TYPE_OO || + u[i].type == QCOMTEE_ARG_TYPE_IO) + qcomtee_object_put(u[i].o); + } + + return -EINVAL; +} + +/* TEE Device Ops. */ + +static int qcomtee_params_check(struct tee_param *params, int num_params) +{ + int io = 0, oo = 0, ib = 0, ob = 0; + int i; + + /* QTEE can accept 64 arguments. */ + if (num_params > QCOMTEE_ARGS_MAX) + return -EINVAL; + + /* Supported parameter types. */ + for (i = 0; i < num_params; i++) { + switch (params[i].attr) { + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT: + ib++; + break; + case TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT: + ob++; + break; + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT: + io++; + break; + case TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT: + oo++; + break; + default: + return -EINVAL; + } + } + + /* QTEE can accept 16 arguments of each supported types. */ + if (io > QCOMTEE_ARGS_PER_TYPE || oo > QCOMTEE_ARGS_PER_TYPE || + ib > QCOMTEE_ARGS_PER_TYPE || ob > QCOMTEE_ARGS_PER_TYPE) + return -EINVAL; + + return 0; +} + +/* Check if an operation on ROOT_QCOMTEE_OBJECT from userspace is permitted. */ +static int qcomtee_root_object_check(u32 op, struct tee_param *params, + int num_params) +{ + /* Some privileged operations recognized by QTEE. */ + if (op == QCOMTEE_ROOT_OP_NOTIFY_DOMAIN_CHANGE || + op == QCOMTEE_ROOT_OP_ADCI_ACCEPT || + op == QCOMTEE_ROOT_OP_ADCI_SHUTDOWN) + return -EINVAL; + + /* + * QCOMTEE_ROOT_OP_REG_WITH_CREDENTIALS is to register with QTEE + * by passing a credential object as input OBJREF. TEE_OBJREF_NULL as a + * credential object represents a privileged client for QTEE and + * is used by the kernel only. + */ + if (op == QCOMTEE_ROOT_OP_REG_WITH_CREDENTIALS && num_params == 2) { + if (params[0].attr == TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT && + params[1].attr == TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT) { + if (params[0].u.objref.id == TEE_OBJREF_NULL) + return -EINVAL; + } + } + + return 0; +} + +/** + * qcomtee_object_invoke() - Invoke a QTEE object. + * @ctx: TEE context. + * @arg: ioctl arguments. + * @params: parameters for the object. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +static int qcomtee_object_invoke(struct tee_context *ctx, + struct tee_ioctl_object_invoke_arg *arg, + struct tee_param *params) +{ + struct qcomtee_object_invoke_ctx *oic __free(kfree) = NULL; + struct qcomtee_context_data *ctxdata = ctx->data; + struct qcomtee_arg *u __free(kfree) = NULL; + struct qcomtee_object *object; + int i, ret, result; + + if (qcomtee_params_check(params, arg->num_params)) + return -EINVAL; + + /* First, handle reserved operations: */ + if (arg->op == QCOMTEE_MSG_OBJECT_OP_RELEASE) { + del_qtee_object(arg->id, ctxdata); + + return 0; + } + + /* Otherwise, invoke a QTEE object: */ + oic = qcomtee_object_invoke_ctx_alloc(ctx); + if (!oic) + return -ENOMEM; + + /* +1 for ending QCOMTEE_ARG_TYPE_INV. */ + u = kcalloc(arg->num_params + 1, sizeof(*u), GFP_KERNEL); + if (!u) + return -ENOMEM; + + /* Get an object to invoke. */ + if (arg->id == TEE_OBJREF_NULL) { + /* Use ROOT if TEE_OBJREF_NULL is invoked. */ + if (qcomtee_root_object_check(arg->op, params, arg->num_params)) + return -EINVAL; + + object = ROOT_QCOMTEE_OBJECT; + } else if (find_qtee_object(&object, arg->id, ctxdata)) { + return -EINVAL; + } + + ret = qcomtee_params_to_args(u, params, arg->num_params, ctx); + if (ret) + goto out; + + ret = qcomtee_object_do_invoke(oic, object, arg->op, u, &result); + if (ret) { + qcomtee_arg_for_each_input_object(i, u) { + qcomtee_user_object_set_notify(u[i].o, false); + qcomtee_object_put(u[i].o); + } + + goto out; + } + + /* Prase QTEE response and put driver's object copies: */ + + if (!result) { + /* Assume service is UNAVAIL if unable to process the result. */ + if (qcomtee_params_from_args(params, u, arg->num_params, ctx)) + result = QCOMTEE_MSG_ERROR_UNAVAIL; + } else { + /* + * qcomtee_params_to_args() gets a copy of IO for the driver to + * make sure they do not get released while in the middle of + * invocation. On success (!result), qcomtee_params_from_args() + * puts them; Otherwise, put them here. + */ + qcomtee_arg_for_each_input_object(i, u) + qcomtee_object_put(u[i].o); + } + + arg->ret = result; +out: + qcomtee_object_put(object); + + return ret; +} + +/** + * qcomtee_supp_recv() - Wait for a request for the supplicant. + * @ctx: TEE context. + * @op: requested operation on the object. + * @num_params: number of elements in the parameter array. + * @params: parameters for @op. + * + * The first parameter is a meta %TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT. + * On input, it provides a user buffer. This buffer is used for parameters of + * type %TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT in qcomtee_cb_params_from_args(). + * On output, the object ID and request ID are stored in the meta parameter. + * + * @num_params is updated to the number of parameters that actually exist + * in @params on return. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +static int qcomtee_supp_recv(struct tee_context *ctx, u32 *op, u32 *num_params, + struct tee_param *params) +{ + struct qcomtee_user_object_request_data data; + void __user *uaddr; + size_t ubuf_size; + int i, ret; + + if (!*num_params) + return -EINVAL; + + /* First parameter should be an INOUT + meta parameter. */ + if (params->attr != + (TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT | TEE_IOCTL_PARAM_ATTR_META)) + return -EINVAL; + + /* Other parameters are none. */ + for (i = 1; i < *num_params; i++) + if (params[i].attr) + return -EINVAL; + + if (!IS_ALIGNED(params->u.value.a, 8)) + return -EINVAL; + + /* User buffer and size from meta parameter. */ + uaddr = u64_to_user_ptr(params->u.value.a); + ubuf_size = params->u.value.b; + /* Process TEE parameters. +/-1 to ignore the meta parameter. */ + ret = qcomtee_user_object_select(ctx, params + 1, *num_params - 1, + uaddr, ubuf_size, &data); + if (ret) + return ret; + + params->u.value.a = data.object_id; + params->u.value.b = data.id; + params->u.value.c = 0; + *op = data.op; + *num_params = data.np + 1; + + return 0; +} + +/** + * qcomtee_supp_send() - Submit a response for a request. + * @ctx: TEE context. + * @errno: return value for the request. + * @num_params: number of elements in the parameter array. + * @params: returned parameters. + * + * The first parameter is a meta %TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT. + * It specifies the request ID this response belongs to. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +static int qcomtee_supp_send(struct tee_context *ctx, u32 errno, u32 num_params, + struct tee_param *params) +{ + int req_id; + + if (!num_params) + return -EINVAL; + + /* First parameter should be an OUTPUT + meta parameter. */ + if (params->attr != (TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT | + TEE_IOCTL_PARAM_ATTR_META)) + return -EINVAL; + + req_id = params->u.value.a; + /* Process TEE parameters. +/-1 to ignore the meta parameter. */ + return qcomtee_user_object_submit(ctx, params + 1, num_params - 1, + req_id, errno); +} + +static int qcomtee_open(struct tee_context *ctx) +{ + struct qcomtee_context_data *ctxdata __free(kfree) = NULL; + + ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL); + if (!ctxdata) + return -ENOMEM; + + /* + * In the QTEE driver, the same context is used to refcount resources + * shared by QTEE. For example, teedev_ctx_get() is called for any + * instance of callback objects (see qcomtee_user_param_to_object()). + * + * Maintain a copy of teedev for QTEE as it serves as a direct user of + * this context. The teedev will be released in the context's release(). + * + * tee_device_unregister() will remain blocked until all contexts + * are released. This includes contexts owned by the user, which are + * closed by teedev_close_context(), as well as those owned by QTEE + * closed by teedev_ctx_put() in object's release(). + */ + if (!tee_device_get(ctx->teedev)) + return -EINVAL; + + idr_init(&ctxdata->qtee_objects_idr); + mutex_init(&ctxdata->qtee_lock); + idr_init(&ctxdata->reqs_idr); + INIT_LIST_HEAD(&ctxdata->reqs_list); + mutex_init(&ctxdata->reqs_lock); + init_completion(&ctxdata->req_c); + + ctx->data = no_free_ptr(ctxdata); + + return 0; +} + +/* Gets called when the user closes the device */ +static void qcomtee_close_context(struct tee_context *ctx) +{ + struct qcomtee_context_data *ctxdata = ctx->data; + struct qcomtee_object *object; + int id; + + /* Process QUEUED or PROCESSING requests. */ + qcomtee_requests_destroy(ctxdata); + /* Release QTEE objects. */ + idr_for_each_entry(&ctxdata->qtee_objects_idr, object, id) + qcomtee_object_put(object); +} + +/* Gets called when the final reference to the context goes away. */ +static void qcomtee_release(struct tee_context *ctx) +{ + struct qcomtee_context_data *ctxdata = ctx->data; + + idr_destroy(&ctxdata->qtee_objects_idr); + idr_destroy(&ctxdata->reqs_idr); + kfree(ctxdata); + + /* There is nothing shared in this context with QTEE. */ + tee_device_put(ctx->teedev); +} + +static void qcomtee_get_version(struct tee_device *teedev, + struct tee_ioctl_version_data *vers) +{ + struct tee_ioctl_version_data v = { + .impl_id = TEE_IMPL_ID_QTEE, + .gen_caps = TEE_GEN_CAP_OBJREF, + }; + + *vers = v; +} + +/** + * qcomtee_get_qtee_feature_list() - Query QTEE features versions. + * @ctx: TEE context. + * @id: ID of the feature to query. + * @version: version of the feature. + * + * Used to query the verion of features supported by QTEE. + */ +static void qcomtee_get_qtee_feature_list(struct tee_context *ctx, u32 id, + u32 *version) +{ + struct qcomtee_object_invoke_ctx *oic __free(kfree); + struct qcomtee_object *client_env, *service; + struct qcomtee_arg u[3] = { 0 }; + int result; + + oic = qcomtee_object_invoke_ctx_alloc(ctx); + if (!oic) + return; + + client_env = qcomtee_object_get_client_env(oic); + if (client_env == NULL_QCOMTEE_OBJECT) + return; + + /* Get ''FeatureVersions Service'' object. */ + service = qcomtee_object_get_service(oic, client_env, + QCOMTEE_FEATURE_VER_UID); + if (service == NULL_QCOMTEE_OBJECT) + goto out_failed; + + /* IB: Feature to query. */ + u[0].b.addr = &id; + u[0].b.size = sizeof(id); + u[0].type = QCOMTEE_ARG_TYPE_IB; + + /* OB: Version returned. */ + u[1].b.addr = version; + u[1].b.size = sizeof(*version); + u[1].type = QCOMTEE_ARG_TYPE_OB; + + qcomtee_object_do_invoke(oic, service, QCOMTEE_FEATURE_VER_OP_GET, u, + &result); + +out_failed: + qcomtee_object_put(service); + qcomtee_object_put(client_env); +} + +static const struct tee_driver_ops qcomtee_ops = { + .get_version = qcomtee_get_version, + .open = qcomtee_open, + .close_context = qcomtee_close_context, + .release = qcomtee_release, + .object_invoke_func = qcomtee_object_invoke, + .supp_recv = qcomtee_supp_recv, + .supp_send = qcomtee_supp_send, +}; + +static const struct tee_desc qcomtee_desc = { + .name = "qcomtee", + .ops = &qcomtee_ops, + .owner = THIS_MODULE, +}; + +static int qcomtee_probe(struct platform_device *pdev) +{ + struct workqueue_struct *async_wq; + struct tee_device *teedev; + struct tee_shm_pool *pool; + struct tee_context *ctx; + struct qcomtee *qcomtee; + int err; + + qcomtee = kzalloc(sizeof(*qcomtee), GFP_KERNEL); + if (!qcomtee) + return -ENOMEM; + + pool = qcomtee_shm_pool_alloc(); + if (IS_ERR(pool)) { + err = PTR_ERR(pool); + + goto err_free_qcomtee; + } + + teedev = tee_device_alloc(&qcomtee_desc, NULL, pool, qcomtee); + if (IS_ERR(teedev)) { + err = PTR_ERR(teedev); + + goto err_pool_destroy; + } + + qcomtee->teedev = teedev; + qcomtee->pool = pool; + err = tee_device_register(qcomtee->teedev); + if (err) + goto err_unreg_teedev; + + platform_set_drvdata(pdev, qcomtee); + /* Start async wq. */ + async_wq = alloc_ordered_workqueue("qcomtee_wq", 0); + if (!async_wq) { + err = -ENOMEM; + + goto err_unreg_teedev; + } + + qcomtee->wq = async_wq; + /* Driver context used for async operations of teedev. */ + ctx = teedev_open(qcomtee->teedev); + if (IS_ERR(ctx)) { + err = PTR_ERR(ctx); + + goto err_dest_wq; + } + + qcomtee->ctx = ctx; + /* Init Object table. */ + qcomtee->xa_last_id = 0; + xa_init_flags(&qcomtee->xa_local_objects, XA_FLAGS_ALLOC); + /* Get QTEE verion. */ + qcomtee_get_qtee_feature_list(qcomtee->ctx, + QCOMTEE_FEATURE_VER_OP_GET_QTEE_ID, + &qcomtee->qtee_version); + + pr_info("QTEE version %u.%u.%u\n", + QTEE_VERSION_GET_MAJOR(qcomtee->qtee_version), + QTEE_VERSION_GET_MINOR(qcomtee->qtee_version), + QTEE_VERSION_GET_PATCH(qcomtee->qtee_version)); + + return 0; + +err_dest_wq: + destroy_workqueue(qcomtee->wq); +err_unreg_teedev: + tee_device_unregister(qcomtee->teedev); +err_pool_destroy: + tee_shm_pool_free(pool); +err_free_qcomtee: + kfree(qcomtee); + + return err; +} + +/** + * qcomtee_remove() - Device Removal Routine. + * @pdev: platform device information struct. + * + * It is called by the platform subsystem to alert the driver that it should + * release the device. + * + * QTEE does not provide an API to inform it about a callback object going away. + * However, when releasing QTEE objects, any callback object sent to QTEE + * previously would be released by QTEE as part of the object release. + */ +static void qcomtee_remove(struct platform_device *pdev) +{ + struct qcomtee *qcomtee = platform_get_drvdata(pdev); + + teedev_close_context(qcomtee->ctx); + /* Wait for RELEASE operations to be processed for QTEE objects. */ + tee_device_unregister(qcomtee->teedev); + destroy_workqueue(qcomtee->wq); + tee_shm_pool_free(qcomtee->pool); + kfree(qcomtee); +} + +static const struct platform_device_id qcomtee_ids[] = { { "qcomtee", 0 }, {} }; +MODULE_DEVICE_TABLE(platform, qcomtee_ids); + +static struct platform_driver qcomtee_platform_driver = { + .probe = qcomtee_probe, + .remove = qcomtee_remove, + .driver = { + .name = "qcomtee", + }, + .id_table = qcomtee_ids, +}; + +module_platform_driver(qcomtee_platform_driver); + +MODULE_AUTHOR("Qualcomm"); +MODULE_DESCRIPTION("QTEE driver"); +MODULE_VERSION("1.0"); +MODULE_LICENSE("GPL"); diff --git a/drivers/tee/qcomtee/core.c b/drivers/tee/qcomtee/core.c new file mode 100644 index 000000000000..b6931ed6f200 --- /dev/null +++ b/drivers/tee/qcomtee/core.c @@ -0,0 +1,906 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/firmware/qcom/qcom_scm.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/uaccess.h> +#include <linux/xarray.h> + +#include "qcomtee.h" + +/* QTEE root object. */ +struct qcomtee_object qcomtee_object_root = { + .name = "root", + .object_type = QCOMTEE_OBJECT_TYPE_ROOT, + .info.qtee_id = QCOMTEE_MSG_OBJECT_ROOT, +}; + +/* Next argument of type @type after index @i. */ +int qcomtee_next_arg_type(struct qcomtee_arg *u, int i, + enum qcomtee_arg_type type) +{ + while (u[i].type != QCOMTEE_ARG_TYPE_INV && u[i].type != type) + i++; + return i; +} + +/* + * QTEE expects IDs with the QCOMTEE_MSG_OBJECT_NS_BIT set for objects + * of the QCOMTEE_OBJECT_TYPE_CB type. + */ +#define QCOMTEE_OBJECT_ID_START (QCOMTEE_MSG_OBJECT_NS_BIT + 1) +#define QCOMTEE_OBJECT_ID_END (U32_MAX) + +#define QCOMTEE_OBJECT_SET(p, type, ...) \ + __QCOMTEE_OBJECT_SET(p, type, ##__VA_ARGS__, 0UL) +#define __QCOMTEE_OBJECT_SET(p, type, optr, ...) \ + do { \ + (p)->object_type = (type); \ + (p)->info.qtee_id = (unsigned long)(optr); \ + } while (0) + +static struct qcomtee_object * +qcomtee_qtee_object_alloc(struct qcomtee_object_invoke_ctx *oic, + unsigned int object_id) +{ + struct qcomtee *qcomtee = tee_get_drvdata(oic->ctx->teedev); + struct qcomtee_object *object; + + object = kzalloc(sizeof(*object), GFP_KERNEL); + if (!object) + return NULL_QCOMTEE_OBJECT; + + /* If failed, "no-name". */ + object->name = kasprintf(GFP_KERNEL, "qcomtee-%u", object_id); + QCOMTEE_OBJECT_SET(object, QCOMTEE_OBJECT_TYPE_TEE, object_id); + kref_init(&object->refcount); + /* A QTEE object requires a context for async operations. */ + object->info.qcomtee_async_ctx = qcomtee->ctx; + teedev_ctx_get(object->info.qcomtee_async_ctx); + + return object; +} + +static void qcomtee_qtee_object_free(struct qcomtee_object *object) +{ + /* See qcomtee_qtee_object_alloc(). */ + teedev_ctx_put(object->info.qcomtee_async_ctx); + + kfree(object->name); + kfree(object); +} + +static void qcomtee_do_release_qtee_object(struct work_struct *work) +{ + struct qcomtee_object *object; + struct qcomtee *qcomtee; + int ret, result; + + /* RELEASE does not require any argument. */ + struct qcomtee_arg args[] = { { .type = QCOMTEE_ARG_TYPE_INV } }; + + object = container_of(work, struct qcomtee_object, work); + qcomtee = tee_get_drvdata(object->info.qcomtee_async_ctx->teedev); + /* Get the TEE context used for asynchronous operations. */ + qcomtee->oic.ctx = object->info.qcomtee_async_ctx; + + ret = qcomtee_object_do_invoke_internal(&qcomtee->oic, object, + QCOMTEE_MSG_OBJECT_OP_RELEASE, + args, &result); + + /* Is it safe to retry the release? */ + if (ret && ret != -ENODEV) { + queue_work(qcomtee->wq, &object->work); + } else { + if (ret || result) + pr_err("%s release failed, ret = %d (%x)\n", + qcomtee_object_name(object), ret, result); + qcomtee_qtee_object_free(object); + } +} + +static void qcomtee_release_qtee_object(struct qcomtee_object *object) +{ + struct qcomtee *qcomtee = + tee_get_drvdata(object->info.qcomtee_async_ctx->teedev); + + INIT_WORK(&object->work, qcomtee_do_release_qtee_object); + queue_work(qcomtee->wq, &object->work); +} + +static void qcomtee_object_release(struct kref *refcount) +{ + struct qcomtee_object *object; + const char *name; + + object = container_of(refcount, struct qcomtee_object, refcount); + + /* + * qcomtee_object_get() is called in a RCU read lock. synchronize_rcu() + * to avoid releasing the object while it is being accessed in + * qcomtee_object_get(). + */ + synchronize_rcu(); + + switch (typeof_qcomtee_object(object)) { + case QCOMTEE_OBJECT_TYPE_TEE: + qcomtee_release_qtee_object(object); + + break; + case QCOMTEE_OBJECT_TYPE_CB: + name = object->name; + + if (object->ops->release) + object->ops->release(object); + + kfree_const(name); + + break; + case QCOMTEE_OBJECT_TYPE_ROOT: + case QCOMTEE_OBJECT_TYPE_NULL: + default: + break; + } +} + +/** + * qcomtee_object_get() - Increase the object's reference count. + * @object: object to increase the reference count. + * + * Context: The caller should hold RCU read lock. + */ +int qcomtee_object_get(struct qcomtee_object *object) +{ + if (object != NULL_QCOMTEE_OBJECT && object != ROOT_QCOMTEE_OBJECT) + return kref_get_unless_zero(&object->refcount); + + return 0; +} + +/** + * qcomtee_object_put() - Decrease the object's reference count. + * @object: object to decrease the reference count. + */ +void qcomtee_object_put(struct qcomtee_object *object) +{ + if (object != NULL_QCOMTEE_OBJECT && object != ROOT_QCOMTEE_OBJECT) + kref_put(&object->refcount, qcomtee_object_release); +} + +static int qcomtee_idx_alloc(struct qcomtee_object_invoke_ctx *oic, u32 *idx, + struct qcomtee_object *object) +{ + struct qcomtee *qcomtee = tee_get_drvdata(oic->ctx->teedev); + + /* Every ID allocated here has QCOMTEE_MSG_OBJECT_NS_BIT set. */ + return xa_alloc_cyclic(&qcomtee->xa_local_objects, idx, object, + XA_LIMIT(QCOMTEE_OBJECT_ID_START, + QCOMTEE_OBJECT_ID_END), + &qcomtee->xa_last_id, GFP_KERNEL); +} + +struct qcomtee_object *qcomtee_idx_erase(struct qcomtee_object_invoke_ctx *oic, + u32 idx) +{ + struct qcomtee *qcomtee = tee_get_drvdata(oic->ctx->teedev); + + if (idx < QCOMTEE_OBJECT_ID_START || idx > QCOMTEE_OBJECT_ID_END) + return NULL_QCOMTEE_OBJECT; + + return xa_erase(&qcomtee->xa_local_objects, idx); +} + +/** + * qcomtee_object_id_get() - Get an ID for an object to send to QTEE. + * @oic: context to use for the invocation. + * @object: object to assign an ID. + * @object_id: object ID. + * + * Called on the path to QTEE to construct the message; see + * qcomtee_prepare_msg() and qcomtee_update_msg(). + * + * Return: On success, returns 0; on failure, returns < 0. + */ +static int qcomtee_object_id_get(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *object, + unsigned int *object_id) +{ + u32 idx; + + switch (typeof_qcomtee_object(object)) { + case QCOMTEE_OBJECT_TYPE_CB: + if (qcomtee_idx_alloc(oic, &idx, object) < 0) + return -ENOSPC; + + *object_id = idx; + + break; + case QCOMTEE_OBJECT_TYPE_ROOT: + case QCOMTEE_OBJECT_TYPE_TEE: + *object_id = object->info.qtee_id; + + break; + case QCOMTEE_OBJECT_TYPE_NULL: + *object_id = QCOMTEE_MSG_OBJECT_NULL; + + break; + } + + return 0; +} + +/* Release object ID assigned in qcomtee_object_id_get. */ +static void qcomtee_object_id_put(struct qcomtee_object_invoke_ctx *oic, + unsigned int object_id) +{ + qcomtee_idx_erase(oic, object_id); +} + +/** + * qcomtee_local_object_get() - Get the object referenced by the ID. + * @oic: context to use for the invocation. + * @object_id: object ID. + * + * It is called on the path from QTEE. + * It is called on behalf of QTEE to obtain an instance of an object + * for a given ID. It increases the object's reference count on success. + * + * Return: On error, returns %NULL_QCOMTEE_OBJECT. + * On success, returns the object. + */ +static struct qcomtee_object * +qcomtee_local_object_get(struct qcomtee_object_invoke_ctx *oic, + unsigned int object_id) +{ + struct qcomtee *qcomtee = tee_get_drvdata(oic->ctx->teedev); + struct qcomtee_object *object; + + guard(rcu)(); + object = xa_load(&qcomtee->xa_local_objects, object_id); + /* It already checks for %NULL_QCOMTEE_OBJECT. */ + qcomtee_object_get(object); + + return object; +} + +/** + * qcomtee_object_user_init() - Initialize an object for the user. + * @object: object to initialize. + * @ot: type of object as &enum qcomtee_object_type. + * @ops: instance of callbacks. + * @fmt: name assigned to the object. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_object_user_init(struct qcomtee_object *object, + enum qcomtee_object_type ot, + struct qcomtee_object_operations *ops, + const char *fmt, ...) +{ + va_list ap; + int ret; + + kref_init(&object->refcount); + QCOMTEE_OBJECT_SET(object, QCOMTEE_OBJECT_TYPE_NULL); + + va_start(ap, fmt); + switch (ot) { + case QCOMTEE_OBJECT_TYPE_NULL: + ret = 0; + + break; + case QCOMTEE_OBJECT_TYPE_CB: + object->ops = ops; + if (!object->ops->dispatch) + return -EINVAL; + + /* If failed, "no-name". */ + object->name = kvasprintf_const(GFP_KERNEL, fmt, ap); + QCOMTEE_OBJECT_SET(object, QCOMTEE_OBJECT_TYPE_CB); + + ret = 0; + break; + case QCOMTEE_OBJECT_TYPE_ROOT: + case QCOMTEE_OBJECT_TYPE_TEE: + default: + ret = -EINVAL; + } + va_end(ap); + + return ret; +} + +/** + * qcomtee_object_type() - Returns the type of object represented by an ID. + * @object_id: object ID for the object. + * + * Similar to typeof_qcomtee_object(), but instead of receiving an object as + * an argument, it receives an object ID. It is used internally on the return + * path from QTEE. + * + * Return: Returns the type of object referenced by @object_id. + */ +static enum qcomtee_object_type qcomtee_object_type(unsigned int object_id) +{ + if (object_id == QCOMTEE_MSG_OBJECT_NULL) + return QCOMTEE_OBJECT_TYPE_NULL; + + if (object_id & QCOMTEE_MSG_OBJECT_NS_BIT) + return QCOMTEE_OBJECT_TYPE_CB; + + return QCOMTEE_OBJECT_TYPE_TEE; +} + +/** + * qcomtee_object_qtee_init() - Initialize an object for QTEE. + * @oic: context to use for the invocation. + * @object: object returned. + * @object_id: object ID received from QTEE. + * + * Return: On failure, returns < 0 and sets @object to %NULL_QCOMTEE_OBJECT. + * On success, returns 0 + */ +static int qcomtee_object_qtee_init(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object **object, + unsigned int object_id) +{ + int ret = 0; + + switch (qcomtee_object_type(object_id)) { + case QCOMTEE_OBJECT_TYPE_NULL: + *object = NULL_QCOMTEE_OBJECT; + + break; + case QCOMTEE_OBJECT_TYPE_CB: + *object = qcomtee_local_object_get(oic, object_id); + if (*object == NULL_QCOMTEE_OBJECT) + ret = -EINVAL; + + break; + + default: /* QCOMTEE_OBJECT_TYPE_TEE */ + *object = qcomtee_qtee_object_alloc(oic, object_id); + if (*object == NULL_QCOMTEE_OBJECT) + ret = -ENOMEM; + + break; + } + + return ret; +} + +/* + * ''Marshaling API'' + * qcomtee_prepare_msg - Prepare the inbound buffer for sending to QTEE + * qcomtee_update_args - Parse the QTEE response in the inbound buffer + * qcomtee_prepare_args - Parse the QTEE request from the outbound buffer + * qcomtee_update_msg - Update the outbound buffer with the response for QTEE + */ + +static int qcomtee_prepare_msg(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *object, u32 op, + struct qcomtee_arg *u) +{ + struct qcomtee_msg_object_invoke *msg; + unsigned int object_id; + int i, ib, ob, io, oo; + size_t offset; + + /* Use the input message buffer in 'oic'. */ + msg = oic->in_msg.addr; + + /* Start offset in a message for buffer arguments. */ + offset = qcomtee_msg_buffer_args(struct qcomtee_msg_object_invoke, + qcomtee_args_len(u)); + + /* Get the ID of the object being invoked. */ + if (qcomtee_object_id_get(oic, object, &object_id)) + return -ENOSPC; + + ib = 0; + qcomtee_arg_for_each_input_buffer(i, u) { + void *msgptr; /* Address of buffer payload: */ + /* Overflow already checked in qcomtee_msg_buffers_alloc(). */ + msg->args[ib].b.offset = offset; + msg->args[ib].b.size = u[i].b.size; + + msgptr = qcomtee_msg_offset_to_ptr(msg, offset); + /* Userspace client or kernel client!? */ + if (!(u[i].flags & QCOMTEE_ARG_FLAGS_UADDR)) + memcpy(msgptr, u[i].b.addr, u[i].b.size); + else if (copy_from_user(msgptr, u[i].b.uaddr, u[i].b.size)) + return -EINVAL; + + offset += qcomtee_msg_offset_align(u[i].b.size); + ib++; + } + + ob = ib; + qcomtee_arg_for_each_output_buffer(i, u) { + /* Overflow already checked in qcomtee_msg_buffers_alloc(). */ + msg->args[ob].b.offset = offset; + msg->args[ob].b.size = u[i].b.size; + + offset += qcomtee_msg_offset_align(u[i].b.size); + ob++; + } + + io = ob; + qcomtee_arg_for_each_input_object(i, u) { + if (qcomtee_object_id_get(oic, u[i].o, &msg->args[io].o)) { + qcomtee_object_id_put(oic, object_id); + for (io--; io >= ob; io--) + qcomtee_object_id_put(oic, msg->args[io].o); + + return -ENOSPC; + } + + io++; + } + + oo = io; + qcomtee_arg_for_each_output_object(i, u) + oo++; + + /* Set object, operation, and argument counts. */ + qcomtee_msg_init(msg, object_id, op, ib, ob, io, oo); + + return 0; +} + +/** + * qcomtee_update_args() - Parse the QTEE response in the inbound buffer. + * @u: array of arguments for the invocation. + * @oic: context to use for the invocation. + * + * @u must be the same as the one used in qcomtee_prepare_msg() when + * initializing the inbound buffer. + * + * On failure, it continues processing the QTEE message. The caller should + * do the necessary cleanup, including calling qcomtee_object_put() + * on the output objects. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +static int qcomtee_update_args(struct qcomtee_arg *u, + struct qcomtee_object_invoke_ctx *oic) +{ + struct qcomtee_msg_object_invoke *msg; + int i, ib, ob, io, oo; + int ret = 0; + + /* Use the input message buffer in 'oic'. */ + msg = oic->in_msg.addr; + + ib = 0; + qcomtee_arg_for_each_input_buffer(i, u) + ib++; + + ob = ib; + qcomtee_arg_for_each_output_buffer(i, u) { + void *msgptr; /* Address of buffer payload: */ + /* QTEE can override the size to a smaller value. */ + u[i].b.size = msg->args[ob].b.size; + + msgptr = qcomtee_msg_offset_to_ptr(msg, msg->args[ob].b.offset); + /* Userspace client or kernel client!? */ + if (!(u[i].flags & QCOMTEE_ARG_FLAGS_UADDR)) + memcpy(u[i].b.addr, msgptr, u[i].b.size); + else if (copy_to_user(u[i].b.uaddr, msgptr, u[i].b.size)) + ret = -EINVAL; + + ob++; + } + + io = ob; + qcomtee_arg_for_each_input_object(i, u) + io++; + + oo = io; + qcomtee_arg_for_each_output_object(i, u) { + if (qcomtee_object_qtee_init(oic, &u[i].o, msg->args[oo].o)) + ret = -EINVAL; + + oo++; + } + + return ret; +} + +/** + * qcomtee_prepare_args() - Parse the QTEE request from the outbound buffer. + * @oic: context to use for the invocation. + * + * It initializes &qcomtee_object_invoke_ctx->u based on the QTEE request in + * the outbound buffer. It sets %QCOMTEE_ARG_TYPE_INV at the end of the array. + * + * On failure, it continues processing the QTEE message. The caller should + * do the necessary cleanup, including calling qcomtee_object_put() + * on the input objects. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +static int qcomtee_prepare_args(struct qcomtee_object_invoke_ctx *oic) +{ + struct qcomtee_msg_callback *msg; + int i, ret = 0; + + /* Use the output message buffer in 'oic'. */ + msg = oic->out_msg.addr; + + qcomtee_msg_for_each_input_buffer(i, msg) { + oic->u[i].b.addr = + qcomtee_msg_offset_to_ptr(msg, msg->args[i].b.offset); + oic->u[i].b.size = msg->args[i].b.size; + oic->u[i].type = QCOMTEE_ARG_TYPE_IB; + } + + qcomtee_msg_for_each_output_buffer(i, msg) { + oic->u[i].b.addr = + qcomtee_msg_offset_to_ptr(msg, msg->args[i].b.offset); + oic->u[i].b.size = msg->args[i].b.size; + oic->u[i].type = QCOMTEE_ARG_TYPE_OB; + } + + qcomtee_msg_for_each_input_object(i, msg) { + if (qcomtee_object_qtee_init(oic, &oic->u[i].o, msg->args[i].o)) + ret = -EINVAL; + + oic->u[i].type = QCOMTEE_ARG_TYPE_IO; + } + + qcomtee_msg_for_each_output_object(i, msg) + oic->u[i].type = QCOMTEE_ARG_TYPE_OO; + + /* End of Arguments. */ + oic->u[i].type = QCOMTEE_ARG_TYPE_INV; + + return ret; +} + +static int qcomtee_update_msg(struct qcomtee_object_invoke_ctx *oic) +{ + struct qcomtee_msg_callback *msg; + int i, ib, ob, io, oo; + + /* Use the output message buffer in 'oic'. */ + msg = oic->out_msg.addr; + + ib = 0; + qcomtee_arg_for_each_input_buffer(i, oic->u) + ib++; + + ob = ib; + qcomtee_arg_for_each_output_buffer(i, oic->u) { + /* Only reduce size; never increase it. */ + if (msg->args[ob].b.size < oic->u[i].b.size) + return -EINVAL; + + msg->args[ob].b.size = oic->u[i].b.size; + ob++; + } + + io = ob; + qcomtee_arg_for_each_input_object(i, oic->u) + io++; + + oo = io; + qcomtee_arg_for_each_output_object(i, oic->u) { + if (qcomtee_object_id_get(oic, oic->u[i].o, &msg->args[oo].o)) { + for (oo--; oo >= io; oo--) + qcomtee_object_id_put(oic, msg->args[oo].o); + + return -ENOSPC; + } + + oo++; + } + + return 0; +} + +/* Invoke a callback object. */ +static void qcomtee_cb_object_invoke(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_msg_callback *msg) +{ + int i, errno; + u32 op; + + /* Get the object being invoked. */ + unsigned int object_id = msg->cxt; + struct qcomtee_object *object; + + /* QTEE cannot invoke a NULL object or objects it hosts. */ + if (qcomtee_object_type(object_id) == QCOMTEE_OBJECT_TYPE_NULL || + qcomtee_object_type(object_id) == QCOMTEE_OBJECT_TYPE_TEE) { + errno = -EINVAL; + goto out; + } + + object = qcomtee_local_object_get(oic, object_id); + if (object == NULL_QCOMTEE_OBJECT) { + errno = -EINVAL; + goto out; + } + + oic->object = object; + + /* Filter bits used by transport. */ + op = msg->op & QCOMTEE_MSG_OBJECT_OP_MASK; + + switch (op) { + case QCOMTEE_MSG_OBJECT_OP_RELEASE: + qcomtee_object_id_put(oic, object_id); + qcomtee_object_put(object); + errno = 0; + + break; + case QCOMTEE_MSG_OBJECT_OP_RETAIN: + qcomtee_object_get(object); + errno = 0; + + break; + default: + errno = qcomtee_prepare_args(oic); + if (errno) { + /* Release any object that arrived as input. */ + qcomtee_arg_for_each_input_buffer(i, oic->u) + qcomtee_object_put(oic->u[i].o); + + break; + } + + errno = object->ops->dispatch(oic, object, op, oic->u); + if (!errno) { + /* On success, notify at the appropriate time. */ + oic->flags |= QCOMTEE_OIC_FLAG_NOTIFY; + } + } + +out: + + oic->errno = errno; +} + +static int +qcomtee_object_invoke_ctx_invoke(struct qcomtee_object_invoke_ctx *oic, + int *result, u64 *res_type) +{ + phys_addr_t out_msg_paddr; + phys_addr_t in_msg_paddr; + int ret; + u64 res; + + tee_shm_get_pa(oic->out_shm, 0, &out_msg_paddr); + tee_shm_get_pa(oic->in_shm, 0, &in_msg_paddr); + if (!(oic->flags & QCOMTEE_OIC_FLAG_BUSY)) + ret = qcom_scm_qtee_invoke_smc(in_msg_paddr, oic->in_msg.size, + out_msg_paddr, oic->out_msg.size, + &res, res_type); + else + ret = qcom_scm_qtee_callback_response(out_msg_paddr, + oic->out_msg.size, + &res, res_type); + + if (ret) + pr_err("QTEE returned with %d.\n", ret); + else + *result = (int)res; + + return ret; +} + +/** + * qcomtee_qtee_objects_put() - Put the callback objects in the argument array. + * @u: array of arguments. + * + * When qcomtee_object_do_invoke_internal() is successfully invoked, + * QTEE takes ownership of the callback objects. If the invocation fails, + * qcomtee_object_do_invoke_internal() calls qcomtee_qtee_objects_put() + * to mimic the release of callback objects by QTEE. + */ +static void qcomtee_qtee_objects_put(struct qcomtee_arg *u) +{ + int i; + + qcomtee_arg_for_each_input_object(i, u) { + if (typeof_qcomtee_object(u[i].o) == QCOMTEE_OBJECT_TYPE_CB) + qcomtee_object_put(u[i].o); + } +} + +/** + * qcomtee_object_do_invoke_internal() - Submit an invocation for an object. + * @oic: context to use for the current invocation. + * @object: object being invoked. + * @op: requested operation on the object. + * @u: array of arguments for the current invocation. + * @result: result returned from QTEE. + * + * The caller is responsible for keeping track of the refcount for each + * object, including @object. On return, the caller loses ownership of all + * input objects of type %QCOMTEE_OBJECT_TYPE_CB. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_object_do_invoke_internal(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *object, u32 op, + struct qcomtee_arg *u, int *result) +{ + struct qcomtee_msg_callback *cb_msg; + struct qcomtee_object *qto; + int i, ret, errno; + u64 res_type; + + /* Allocate inbound and outbound buffers. */ + ret = qcomtee_msg_buffers_alloc(oic, u); + if (ret) { + qcomtee_qtee_objects_put(u); + + return ret; + } + + ret = qcomtee_prepare_msg(oic, object, op, u); + if (ret) { + qcomtee_qtee_objects_put(u); + + goto out; + } + + /* Use input message buffer in 'oic'. */ + cb_msg = oic->out_msg.addr; + + while (1) { + if (oic->flags & QCOMTEE_OIC_FLAG_BUSY) { + errno = oic->errno; + if (!errno) + errno = qcomtee_update_msg(oic); + qcomtee_msg_set_result(cb_msg, errno); + } + + /* Invoke the remote object. */ + ret = qcomtee_object_invoke_ctx_invoke(oic, result, &res_type); + /* Return form callback objects result submission: */ + if (oic->flags & QCOMTEE_OIC_FLAG_BUSY) { + qto = oic->object; + if (qto) { + if (oic->flags & QCOMTEE_OIC_FLAG_NOTIFY) { + if (qto->ops->notify) + qto->ops->notify(oic, qto, + errno || ret); + } + + /* Get is in qcomtee_cb_object_invoke(). */ + qcomtee_object_put(qto); + } + + oic->object = NULL_QCOMTEE_OBJECT; + oic->flags &= ~(QCOMTEE_OIC_FLAG_BUSY | + QCOMTEE_OIC_FLAG_NOTIFY); + } + + if (ret) { + /* + * Unable to finished the invocation. + * If QCOMTEE_OIC_FLAG_SHARED is not set, put + * QCOMTEE_OBJECT_TYPE_CB input objects. + */ + if (!(oic->flags & QCOMTEE_OIC_FLAG_SHARED)) + qcomtee_qtee_objects_put(u); + else + ret = -ENODEV; + + goto out; + + } else { + /* + * QTEE obtained ownership of QCOMTEE_OBJECT_TYPE_CB + * input objects in 'u'. On further failure, QTEE is + * responsible for releasing them. + */ + oic->flags |= QCOMTEE_OIC_FLAG_SHARED; + } + + /* Is it a callback request? */ + if (res_type != QCOMTEE_RESULT_INBOUND_REQ_NEEDED) { + /* + * Parse results. If failed, assume the service + * was unavailable (i.e. QCOMTEE_MSG_ERROR_UNAVAIL) + * and put output objects to initiate cleanup. + */ + if (!*result && qcomtee_update_args(u, oic)) { + *result = QCOMTEE_MSG_ERROR_UNAVAIL; + qcomtee_arg_for_each_output_object(i, u) + qcomtee_object_put(u[i].o); + } + + break; + + } else { + oic->flags |= QCOMTEE_OIC_FLAG_BUSY; + qcomtee_fetch_async_reqs(oic); + qcomtee_cb_object_invoke(oic, cb_msg); + } + } + + qcomtee_fetch_async_reqs(oic); +out: + qcomtee_msg_buffers_free(oic); + + return ret; +} + +int qcomtee_object_do_invoke(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *object, u32 op, + struct qcomtee_arg *u, int *result) +{ + /* User can not set bits used by transport. */ + if (op & ~QCOMTEE_MSG_OBJECT_OP_MASK) + return -EINVAL; + + /* User can only invoke QTEE hosted objects. */ + if (typeof_qcomtee_object(object) != QCOMTEE_OBJECT_TYPE_TEE && + typeof_qcomtee_object(object) != QCOMTEE_OBJECT_TYPE_ROOT) + return -EINVAL; + + /* User cannot directly issue these operations to QTEE. */ + if (op == QCOMTEE_MSG_OBJECT_OP_RELEASE || + op == QCOMTEE_MSG_OBJECT_OP_RETAIN) + return -EINVAL; + + return qcomtee_object_do_invoke_internal(oic, object, op, u, result); +} + +/** + * qcomtee_object_get_client_env() - Get a privileged client env. object. + * @oic: context to use for the current invocation. + * + * The caller should call qcomtee_object_put() on the returned object + * to release it. + * + * Return: On error, returns %NULL_QCOMTEE_OBJECT. + * On success, returns the object. + */ +struct qcomtee_object * +qcomtee_object_get_client_env(struct qcomtee_object_invoke_ctx *oic) +{ + struct qcomtee_arg u[3] = { 0 }; + int ret, result; + + u[0].o = NULL_QCOMTEE_OBJECT; + u[0].type = QCOMTEE_ARG_TYPE_IO; + u[1].type = QCOMTEE_ARG_TYPE_OO; + ret = qcomtee_object_do_invoke(oic, ROOT_QCOMTEE_OBJECT, + QCOMTEE_ROOT_OP_REG_WITH_CREDENTIALS, u, + &result); + if (ret || result) + return NULL_QCOMTEE_OBJECT; + + return u[1].o; +} + +struct qcomtee_object * +qcomtee_object_get_service(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *client_env, u32 uid) +{ + struct qcomtee_arg u[3] = { 0 }; + int ret, result; + + u[0].b.addr = &uid; + u[0].b.size = sizeof(uid); + u[0].type = QCOMTEE_ARG_TYPE_IB; + u[1].type = QCOMTEE_ARG_TYPE_OO; + ret = qcomtee_object_do_invoke(oic, client_env, QCOMTEE_CLIENT_ENV_OPEN, + u, &result); + + if (ret || result) + return NULL_QCOMTEE_OBJECT; + + return u[1].o; +} diff --git a/drivers/tee/qcomtee/qcomtee.h b/drivers/tee/qcomtee/qcomtee.h new file mode 100644 index 000000000000..f34be992e68b --- /dev/null +++ b/drivers/tee/qcomtee/qcomtee.h @@ -0,0 +1,143 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#ifndef QCOMTEE_H +#define QCOMTEE_H + +#include <linux/kobject.h> +#include <linux/tee_core.h> + +#include "qcomtee_msg.h" +#include "qcomtee_object.h" + +/* Flags relating to object reference. */ +#define QCOMTEE_OBJREF_FLAG_TEE BIT(0) +#define QCOMTEE_OBJREF_FLAG_USER BIT(1) + +/** + * struct qcomtee - Main service struct. + * @teedev: client device. + * @pool: shared memory pool. + * @ctx: driver private context. + * @oic: context to use for the current driver invocation. + * @wq: workqueue for QTEE async operations. + * @xa_local_objects: array of objects exported to QTEE. + * @xa_last_id: next ID to allocate. + * @qtee_version: QTEE version. + */ +struct qcomtee { + struct tee_device *teedev; + struct tee_shm_pool *pool; + struct tee_context *ctx; + struct qcomtee_object_invoke_ctx oic; + struct workqueue_struct *wq; + struct xarray xa_local_objects; + u32 xa_last_id; + u32 qtee_version; +}; + +void qcomtee_fetch_async_reqs(struct qcomtee_object_invoke_ctx *oic); +struct qcomtee_object *qcomtee_idx_erase(struct qcomtee_object_invoke_ctx *oic, + u32 idx); + +struct tee_shm_pool *qcomtee_shm_pool_alloc(void); +void qcomtee_msg_buffers_free(struct qcomtee_object_invoke_ctx *oic); +int qcomtee_msg_buffers_alloc(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_arg *u); + +/** + * qcomtee_object_do_invoke_internal() - Submit an invocation for an object. + * @oic: context to use for the current invocation. + * @object: object being invoked. + * @op: requested operation on the object. + * @u: array of arguments for the current invocation. + * @result: result returned from QTEE. + * + * The caller is responsible for keeping track of the refcount for each + * object, including @object. On return, the caller loses ownership of all + * input objects of type %QCOMTEE_OBJECT_TYPE_CB. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_object_do_invoke_internal(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *object, u32 op, + struct qcomtee_arg *u, int *result); + +/** + * struct qcomtee_context_data - Clients' or supplicants' context. + * @qtee_objects_idr: QTEE objects in this context. + * @qtee_lock: mutex for @qtee_objects_idr. + * @reqs_idr: requests in this context that hold ID. + * @reqs_list: FIFO for requests in PROCESSING or QUEUED state. + * @reqs_lock: mutex for @reqs_idr, @reqs_list and request states. + * @req_c: completion used when the supplicant is waiting for requests. + * @released: state of this context. + */ +struct qcomtee_context_data { + struct idr qtee_objects_idr; + /* Synchronize access to @qtee_objects_idr. */ + struct mutex qtee_lock; + + struct idr reqs_idr; + struct list_head reqs_list; + /* Synchronize access to @reqs_idr, @reqs_list and updating requests states. */ + struct mutex reqs_lock; + + struct completion req_c; + + bool released; +}; + +int qcomtee_context_add_qtee_object(struct tee_param *param, + struct qcomtee_object *object, + struct tee_context *ctx); +int qcomtee_context_find_qtee_object(struct qcomtee_object **object, + struct tee_param *param, + struct tee_context *ctx); +void qcomtee_context_del_qtee_object(struct tee_param *param, + struct tee_context *ctx); + +int qcomtee_objref_to_arg(struct qcomtee_arg *arg, struct tee_param *param, + struct tee_context *ctx); +int qcomtee_objref_from_arg(struct tee_param *param, struct qcomtee_arg *arg, + struct tee_context *ctx); + +/* OBJECTS: */ + +/* (1) User Object API. */ + +int is_qcomtee_user_object(struct qcomtee_object *object); +void qcomtee_user_object_set_notify(struct qcomtee_object *object, bool notify); +void qcomtee_requests_destroy(struct qcomtee_context_data *ctxdata); +int qcomtee_user_param_to_object(struct qcomtee_object **object, + struct tee_param *param, + struct tee_context *ctx); +int qcomtee_user_param_from_object(struct tee_param *param, + struct qcomtee_object *object, + struct tee_context *ctx); + +/** + * struct qcomtee_user_object_request_data - Data for user object request. + * @id: ID assigned to the request. + * @object_id: Object ID being invoked by QTEE. + * @op: Requested operation on object. + * @np: Number of parameters in the request. + */ +struct qcomtee_user_object_request_data { + int id; + u64 object_id; + u32 op; + int np; +}; + +int qcomtee_user_object_select(struct tee_context *ctx, + struct tee_param *params, int num_params, + void __user *uaddr, size_t size, + struct qcomtee_user_object_request_data *data); +int qcomtee_user_object_submit(struct tee_context *ctx, + struct tee_param *params, int num_params, + int req_id, int errno); + +#endif /* QCOMTEE_H */ diff --git a/drivers/tee/qcomtee/qcomtee_msg.h b/drivers/tee/qcomtee/qcomtee_msg.h new file mode 100644 index 000000000000..878f70178a5b --- /dev/null +++ b/drivers/tee/qcomtee/qcomtee_msg.h @@ -0,0 +1,304 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#ifndef QCOMTEE_MSG_H +#define QCOMTEE_MSG_H + +#include <linux/bitfield.h> + +/** + * DOC: ''Qualcomm TEE'' (QTEE) Transport Message + * + * There are two buffers shared with QTEE: inbound and outbound buffers. + * The inbound buffer is used for direct object invocation, and the outbound + * buffer is used to make a request from QTEE to the kernel; i.e., a callback + * request. + * + * The unused tail of the outbound buffer is also used for sending and + * receiving asynchronous messages. An asynchronous message is independent of + * the current object invocation (i.e., contents of the inbound buffer) or + * callback request (i.e., the head of the outbound buffer); see + * qcomtee_get_async_buffer(). It is used by endpoints (QTEE or kernel) as an + * optimization to reduce the number of context switches between the secure and + * non-secure worlds. + * + * For instance, QTEE never sends an explicit callback request to release an + * object in the kernel. Instead, it sends asynchronous release messages in the + * outbound buffer when QTEE returns from the previous direct object invocation, + * or appends asynchronous release messages after the current callback request. + * + * QTEE supports two types of arguments in a message: buffer and object + * arguments. Depending on the direction of data flow, they could be input + * buffer (IO) to QTEE, output buffer (OB) from QTEE, input object (IO) to QTEE, + * or output object (OO) from QTEE. Object arguments hold object IDs. Buffer + * arguments hold (offset, size) pairs into the inbound or outbound buffers. + * + * QTEE holds an object table for objects it hosts and exposes to the kernel. + * An object ID is an index to the object table in QTEE. + * + * For the direct object invocation message format in the inbound buffer, see + * &struct qcomtee_msg_object_invoke. For the callback request message format + * in the outbound buffer, see &struct qcomtee_msg_callback. For the message + * format for asynchronous messages in the outbound buffer, see + * &struct qcomtee_async_msg_hdr. + */ + +/** + * define QCOMTEE_MSG_OBJECT_NS_BIT - Non-secure bit + * + * Object ID is a globally unique 32-bit number. IDs referencing objects + * in the kernel should have %QCOMTEE_MSG_OBJECT_NS_BIT set. + */ +#define QCOMTEE_MSG_OBJECT_NS_BIT BIT(31) + +/* Static object IDs recognized by QTEE. */ +#define QCOMTEE_MSG_OBJECT_NULL (0U) +#define QCOMTEE_MSG_OBJECT_ROOT (1U) + +/* Definitions from QTEE as part of the transport protocol. */ + +/* qcomtee_msg_arg is an argument as recognized by QTEE. */ +union qcomtee_msg_arg { + struct { + u32 offset; + u32 size; + } b; + u32 o; +}; + +/* BI and BO payloads in QTEE messages should be at 64-bit boundaries. */ +#define qcomtee_msg_offset_align(o) ALIGN((o), sizeof(u64)) + +/* Operations for objects are 32-bit. Transport uses the upper 16 bits. */ +#define QCOMTEE_MSG_OBJECT_OP_MASK GENMASK(15, 0) + +/* Reserved Operation IDs sent to QTEE: */ +/* QCOMTEE_MSG_OBJECT_OP_RELEASE - Reduces the refcount and releases the object. + * QCOMTEE_MSG_OBJECT_OP_RETAIN - Increases the refcount. + * + * These operation IDs are valid for all objects. + */ + +#define QCOMTEE_MSG_OBJECT_OP_RELEASE (QCOMTEE_MSG_OBJECT_OP_MASK - 0) +#define QCOMTEE_MSG_OBJECT_OP_RETAIN (QCOMTEE_MSG_OBJECT_OP_MASK - 1) + +/* Subset of operations supported by QTEE root object. */ + +#define QCOMTEE_ROOT_OP_REG_WITH_CREDENTIALS 5 +#define QCOMTEE_ROOT_OP_NOTIFY_DOMAIN_CHANGE 4 +#define QCOMTEE_ROOT_OP_ADCI_ACCEPT 8 +#define QCOMTEE_ROOT_OP_ADCI_SHUTDOWN 9 + +/* Subset of operations supported by client_env object. */ + +#define QCOMTEE_CLIENT_ENV_OPEN 0 + +/* List of available QTEE service UIDs and subset of operations. */ + +#define QCOMTEE_FEATURE_VER_UID 2033 +#define QCOMTEE_FEATURE_VER_OP_GET 0 +/* Get QTEE version number. */ +#define QCOMTEE_FEATURE_VER_OP_GET_QTEE_ID 10 +#define QTEE_VERSION_GET_MAJOR(x) (((x) >> 22) & 0xffU) +#define QTEE_VERSION_GET_MINOR(x) (((x) >> 12) & 0xffU) +#define QTEE_VERSION_GET_PATCH(x) ((x) >> 0 & 0xfffU) + +/* Response types as returned from qcomtee_object_invoke_ctx_invoke(). */ + +/* The message contains a callback request. */ +#define QCOMTEE_RESULT_INBOUND_REQ_NEEDED 3 + +/** + * struct qcomtee_msg_object_invoke - Direct object invocation message. + * @ctx: object ID hosted in QTEE. + * @op: operation for the object. + * @counts: number of different types of arguments in @args. + * @args: array of arguments. + * + * @counts consists of 4 * 4-bit fields. Bits 0 - 3 represent the number of + * input buffers, bits 4 - 7 represent the number of output buffers, + * bits 8 - 11 represent the number of input objects, and bits 12 - 15 + * represent the number of output objects. The remaining bits should be zero. + * + * 15 12 11 8 7 4 3 0 + * +----------------+----------------+----------------+----------------+ + * | #OO objects | #IO objects | #OB buffers | #IB buffers | + * +----------------+----------------+----------------+----------------+ + * + * The maximum number of arguments of each type is defined by + * %QCOMTEE_ARGS_PER_TYPE. + */ +struct qcomtee_msg_object_invoke { + u32 cxt; + u32 op; + u32 counts; + union qcomtee_msg_arg args[]; +}; + +/* Bit masks for the four 4-bit nibbles holding the counts. */ +#define QCOMTEE_MASK_IB GENMASK(3, 0) +#define QCOMTEE_MASK_OB GENMASK(7, 4) +#define QCOMTEE_MASK_IO GENMASK(11, 8) +#define QCOMTEE_MASK_OO GENMASK(15, 12) + +/** + * struct qcomtee_msg_callback - Callback request message. + * @result: result of operation @op on the object referenced by @cxt. + * @cxt: object ID hosted in the kernel. + * @op: operation for the object. + * @counts: number of different types of arguments in @args. + * @args: array of arguments. + * + * For details of @counts, see &qcomtee_msg_object_invoke.counts. + */ +struct qcomtee_msg_callback { + u32 result; + u32 cxt; + u32 op; + u32 counts; + union qcomtee_msg_arg args[]; +}; + +/* Offset in the message for the beginning of the buffer argument's contents. */ +#define qcomtee_msg_buffer_args(t, n) \ + qcomtee_msg_offset_align(struct_size_t(t, args, n)) +/* Pointer to the beginning of a buffer argument's content at an offset. */ +#define qcomtee_msg_offset_to_ptr(m, off) ((void *)&((char *)(m))[(off)]) + +/* Some helpers to manage msg.counts. */ + +static inline unsigned int qcomtee_msg_num_ib(u32 counts) +{ + return FIELD_GET(QCOMTEE_MASK_IB, counts); +} + +static inline unsigned int qcomtee_msg_num_ob(u32 counts) +{ + return FIELD_GET(QCOMTEE_MASK_OB, counts); +} + +static inline unsigned int qcomtee_msg_num_io(u32 counts) +{ + return FIELD_GET(QCOMTEE_MASK_IO, counts); +} + +static inline unsigned int qcomtee_msg_num_oo(u32 counts) +{ + return FIELD_GET(QCOMTEE_MASK_OO, counts); +} + +static inline unsigned int qcomtee_msg_idx_ib(u32 counts) +{ + return 0; +} + +static inline unsigned int qcomtee_msg_idx_ob(u32 counts) +{ + return qcomtee_msg_num_ib(counts); +} + +static inline unsigned int qcomtee_msg_idx_io(u32 counts) +{ + return qcomtee_msg_idx_ob(counts) + qcomtee_msg_num_ob(counts); +} + +static inline unsigned int qcomtee_msg_idx_oo(u32 counts) +{ + return qcomtee_msg_idx_io(counts) + qcomtee_msg_num_io(counts); +} + +#define qcomtee_msg_for_each(i, first, num) \ + for ((i) = (first); (i) < (first) + (num); (i)++) + +#define qcomtee_msg_for_each_input_buffer(i, m) \ + qcomtee_msg_for_each(i, qcomtee_msg_idx_ib((m)->counts), \ + qcomtee_msg_num_ib((m)->counts)) + +#define qcomtee_msg_for_each_output_buffer(i, m) \ + qcomtee_msg_for_each(i, qcomtee_msg_idx_ob((m)->counts), \ + qcomtee_msg_num_ob((m)->counts)) + +#define qcomtee_msg_for_each_input_object(i, m) \ + qcomtee_msg_for_each(i, qcomtee_msg_idx_io((m)->counts), \ + qcomtee_msg_num_io((m)->counts)) + +#define qcomtee_msg_for_each_output_object(i, m) \ + qcomtee_msg_for_each(i, qcomtee_msg_idx_oo((m)->counts), \ + qcomtee_msg_num_oo((m)->counts)) + +/* Sum of arguments in a message. */ +#define qcomtee_msg_args(m) \ + (qcomtee_msg_idx_oo((m)->counts) + qcomtee_msg_num_oo((m)->counts)) + +static inline void qcomtee_msg_init(struct qcomtee_msg_object_invoke *msg, + u32 cxt, u32 op, int in_buffer, + int out_buffer, int in_object, + int out_object) +{ + u32 counts = 0; + + counts |= (in_buffer & 0xfU); + counts |= ((out_buffer - in_buffer) & 0xfU) << 4; + counts |= ((in_object - out_buffer) & 0xfU) << 8; + counts |= ((out_object - in_object) & 0xfU) << 12; + + msg->cxt = cxt; + msg->op = op; + msg->counts = counts; +} + +/* Generic error codes. */ +#define QCOMTEE_MSG_OK 0 /* non-specific success code. */ +#define QCOMTEE_MSG_ERROR 1 /* non-specific error. */ +#define QCOMTEE_MSG_ERROR_INVALID 2 /* unsupported/unrecognized request. */ +#define QCOMTEE_MSG_ERROR_SIZE_IN 3 /* supplied buffer/string too large. */ +#define QCOMTEE_MSG_ERROR_SIZE_OUT 4 /* supplied output buffer too small. */ +#define QCOMTEE_MSG_ERROR_USERBASE 10 /* start of user-defined error range. */ + +/* Transport layer error codes. */ +#define QCOMTEE_MSG_ERROR_DEFUNCT -90 /* object no longer exists. */ +#define QCOMTEE_MSG_ERROR_ABORT -91 /* calling thread must exit. */ +#define QCOMTEE_MSG_ERROR_BADOBJ -92 /* invalid object context. */ +#define QCOMTEE_MSG_ERROR_NOSLOTS -93 /* caller's object table full. */ +#define QCOMTEE_MSG_ERROR_MAXARGS -94 /* too many args. */ +#define QCOMTEE_MSG_ERROR_MAXDATA -95 /* buffers too large. */ +#define QCOMTEE_MSG_ERROR_UNAVAIL -96 /* the request could not be processed. */ +#define QCOMTEE_MSG_ERROR_KMEM -97 /* kernel out of memory. */ +#define QCOMTEE_MSG_ERROR_REMOTE -98 /* local method sent to remote object. */ +#define QCOMTEE_MSG_ERROR_BUSY -99 /* Object is busy. */ +#define QCOMTEE_MSG_ERROR_TIMEOUT -103 /* Call Back Object invocation timed out. */ + +static inline void qcomtee_msg_set_result(struct qcomtee_msg_callback *cb_msg, + int err) +{ + if (!err) { + cb_msg->result = QCOMTEE_MSG_OK; + } else if (err < 0) { + /* If err < 0, then it is a transport error. */ + switch (err) { + case -ENOMEM: + cb_msg->result = QCOMTEE_MSG_ERROR_KMEM; + break; + case -ENODEV: + cb_msg->result = QCOMTEE_MSG_ERROR_DEFUNCT; + break; + case -ENOSPC: + case -EBUSY: + cb_msg->result = QCOMTEE_MSG_ERROR_BUSY; + break; + case -EBADF: + case -EINVAL: + cb_msg->result = QCOMTEE_MSG_ERROR_UNAVAIL; + break; + default: + cb_msg->result = QCOMTEE_MSG_ERROR; + } + } else { + /* If err > 0, then it is user defined error, pass it as is. */ + cb_msg->result = err; + } +} + +#endif /* QCOMTEE_MSG_H */ diff --git a/drivers/tee/qcomtee/qcomtee_object.h b/drivers/tee/qcomtee/qcomtee_object.h new file mode 100644 index 000000000000..5221449be7db --- /dev/null +++ b/drivers/tee/qcomtee/qcomtee_object.h @@ -0,0 +1,316 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#ifndef QCOMTEE_OBJECT_H +#define QCOMTEE_OBJECT_H + +#include <linux/completion.h> +#include <linux/kref.h> +#include <linux/slab.h> +#include <linux/workqueue.h> + +struct qcomtee_object; + +/** + * DOC: Overview + * + * qcomtee_object provides object refcounting, ID allocation for objects hosted + * in the kernel, and necessary message marshaling for Qualcomm TEE (QTEE). + * + * To invoke an object in QTEE, the user calls qcomtee_object_do_invoke() + * while passing an instance of &struct qcomtee_object and the requested + * operation + arguments. + * + * After boot, QTEE provides a static object %ROOT_QCOMTEE_OBJECT (type of + * %QCOMTEE_OBJECT_TYPE_ROOT). The root object is invoked to pass the user's + * credentials and obtain other instances of &struct qcomtee_object (type of + * %QCOMTEE_OBJECT_TYPE_TEE) that represent services and TAs in QTEE; + * see &enum qcomtee_object_type. + * + * The objects received from QTEE are refcounted. So the owner of these objects + * can issue qcomtee_object_get() to increase the refcount and pass objects + * to other clients, or issue qcomtee_object_put() to decrease the refcount + * and release the resources in QTEE. + * + * The kernel can host services accessible to QTEE. A driver should embed + * an instance of &struct qcomtee_object in the struct it wants to export to + * QTEE (this is called a callback object). It issues qcomtee_object_user_init() + * to set the dispatch() operation for the callback object and set its type + * to %QCOMTEE_OBJECT_TYPE_CB. + * + * core.c holds an object table for callback objects. An object ID is assigned + * to each callback object, which is an index to the object table. QTEE uses + * these IDs to reference or invoke callback objects. + * + * If QTEE invokes a callback object in the kernel, the dispatch() operation is + * called in the context of the thread that originally called + * qcomtee_object_do_invoke(). + */ + +/** + * enum qcomtee_object_type - Object types. + * @QCOMTEE_OBJECT_TYPE_TEE: object hosted on QTEE. + * @QCOMTEE_OBJECT_TYPE_CB: object hosted on kernel. + * @QCOMTEE_OBJECT_TYPE_ROOT: 'primordial' object. + * @QCOMTEE_OBJECT_TYPE_NULL: NULL object. + * + * The primordial object is used for bootstrapping the IPC connection between + * the kernel and QTEE. It is invoked by the kernel when it wants to get a + * 'client env'. + */ +enum qcomtee_object_type { + QCOMTEE_OBJECT_TYPE_TEE, + QCOMTEE_OBJECT_TYPE_CB, + QCOMTEE_OBJECT_TYPE_ROOT, + QCOMTEE_OBJECT_TYPE_NULL, +}; + +/** + * enum qcomtee_arg_type - Type of QTEE argument. + * @QCOMTEE_ARG_TYPE_INV: invalid type. + * @QCOMTEE_ARG_TYPE_OB: output buffer (OB). + * @QCOMTEE_ARG_TYPE_OO: output object (OO). + * @QCOMTEE_ARG_TYPE_IB: input buffer (IB). + * @QCOMTEE_ARG_TYPE_IO: input object (IO). + * + * Use the invalid type to specify the end of the argument array. + */ +enum qcomtee_arg_type { + QCOMTEE_ARG_TYPE_INV = 0, + QCOMTEE_ARG_TYPE_OB, + QCOMTEE_ARG_TYPE_OO, + QCOMTEE_ARG_TYPE_IB, + QCOMTEE_ARG_TYPE_IO, + QCOMTEE_ARG_TYPE_NR, +}; + +/** + * define QCOMTEE_ARGS_PER_TYPE - Maximum arguments of a specific type. + * + * The QTEE transport protocol limits the maximum number of arguments of + * a specific type (i.e., IB, OB, IO, and OO). + */ +#define QCOMTEE_ARGS_PER_TYPE 16 + +/* Maximum arguments that can fit in a QTEE message, ignoring the type. */ +#define QCOMTEE_ARGS_MAX (QCOMTEE_ARGS_PER_TYPE * (QCOMTEE_ARG_TYPE_NR - 1)) + +struct qcomtee_buffer { + union { + void *addr; + void __user *uaddr; + }; + size_t size; +}; + +/** + * struct qcomtee_arg - Argument for QTEE object invocation. + * @type: type of argument as &enum qcomtee_arg_type. + * @flags: extra flags. + * @b: address and size if the type of argument is a buffer. + * @o: object instance if the type of argument is an object. + * + * &qcomtee_arg.flags only accepts %QCOMTEE_ARG_FLAGS_UADDR for now, which + * states that &qcomtee_arg.b contains a userspace address in uaddr. + */ +struct qcomtee_arg { + enum qcomtee_arg_type type; +/* 'b.uaddr' holds a __user address. */ +#define QCOMTEE_ARG_FLAGS_UADDR BIT(0) + unsigned int flags; + union { + struct qcomtee_buffer b; + struct qcomtee_object *o; + }; +}; + +static inline int qcomtee_args_len(struct qcomtee_arg *args) +{ + int i = 0; + + while (args[i].type != QCOMTEE_ARG_TYPE_INV) + i++; + return i; +} + +/* Context is busy (callback is in progress). */ +#define QCOMTEE_OIC_FLAG_BUSY BIT(1) +/* Context needs to notify the current object. */ +#define QCOMTEE_OIC_FLAG_NOTIFY BIT(2) +/* Context has shared state with QTEE. */ +#define QCOMTEE_OIC_FLAG_SHARED BIT(3) + +/** + * struct qcomtee_object_invoke_ctx - QTEE context for object invocation. + * @ctx: TEE context for this invocation. + * @flags: flags for the invocation context. + * @errno: error code for the invocation. + * @object: current object invoked in this callback context. + * @u: array of arguments for the current invocation (+1 for ending arg). + * @in_msg: inbound buffer shared with QTEE. + * @out_msg: outbound buffer shared with QTEE. + * @in_shm: TEE shm allocated for inbound buffer. + * @out_shm: TEE shm allocated for outbound buffer. + * @data: extra data attached to this context. + */ +struct qcomtee_object_invoke_ctx { + struct tee_context *ctx; + unsigned long flags; + int errno; + + struct qcomtee_object *object; + struct qcomtee_arg u[QCOMTEE_ARGS_MAX + 1]; + + struct qcomtee_buffer in_msg; + struct qcomtee_buffer out_msg; + struct tee_shm *in_shm; + struct tee_shm *out_shm; + + void *data; +}; + +static inline struct qcomtee_object_invoke_ctx * +qcomtee_object_invoke_ctx_alloc(struct tee_context *ctx) +{ + struct qcomtee_object_invoke_ctx *oic; + + oic = kzalloc(sizeof(*oic), GFP_KERNEL); + if (oic) + oic->ctx = ctx; + return oic; +} + +/** + * qcomtee_object_do_invoke() - Submit an invocation for an object. + * @oic: context to use for the current invocation. + * @object: object being invoked. + * @op: requested operation on the object. + * @u: array of arguments for the current invocation. + * @result: result returned from QTEE. + * + * The caller is responsible for keeping track of the refcount for each object, + * including @object. On return, the caller loses ownership of all input + * objects of type %QCOMTEE_OBJECT_TYPE_CB. + * + * @object can be of %QCOMTEE_OBJECT_TYPE_ROOT or %QCOMTEE_OBJECT_TYPE_TEE. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_object_do_invoke(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *object, u32 op, + struct qcomtee_arg *u, int *result); + +/** + * struct qcomtee_object_operations - Callback object operations. + * @release: release the object if QTEE is not using it. + * @dispatch: dispatch the operation requested by QTEE. + * @notify: report the status of any pending response submitted by @dispatch. + */ +struct qcomtee_object_operations { + void (*release)(struct qcomtee_object *object); + int (*dispatch)(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *object, u32 op, + struct qcomtee_arg *args); + void (*notify)(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *object, int err); +}; + +/** + * struct qcomtee_object - QTEE or kernel object. + * @name: object name. + * @refcount: reference counter. + * @object_type: object type as &enum qcomtee_object_type. + * @info: extra information for the object. + * @ops: callback operations for objects of type %QCOMTEE_OBJECT_TYPE_CB. + * @work: work for async operations on the object. + * + * @work is used for releasing objects of %QCOMTEE_OBJECT_TYPE_TEE type. + */ +struct qcomtee_object { + const char *name; + struct kref refcount; + + enum qcomtee_object_type object_type; + struct object_info { + unsigned long qtee_id; + /* TEE context for QTEE object async requests. */ + struct tee_context *qcomtee_async_ctx; + } info; + + struct qcomtee_object_operations *ops; + struct work_struct work; +}; + +/* Static instances of qcomtee_object objects. */ +#define NULL_QCOMTEE_OBJECT ((struct qcomtee_object *)(0)) +extern struct qcomtee_object qcomtee_object_root; +#define ROOT_QCOMTEE_OBJECT (&qcomtee_object_root) + +static inline enum qcomtee_object_type +typeof_qcomtee_object(struct qcomtee_object *object) +{ + if (object == NULL_QCOMTEE_OBJECT) + return QCOMTEE_OBJECT_TYPE_NULL; + return object->object_type; +} + +static inline const char *qcomtee_object_name(struct qcomtee_object *object) +{ + if (object == NULL_QCOMTEE_OBJECT) + return "null"; + + if (!object->name) + return "no-name"; + return object->name; +} + +/** + * qcomtee_object_user_init() - Initialize an object for the user. + * @object: object to initialize. + * @ot: type of object as &enum qcomtee_object_type. + * @ops: instance of callbacks. + * @fmt: name assigned to the object. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_object_user_init(struct qcomtee_object *object, + enum qcomtee_object_type ot, + struct qcomtee_object_operations *ops, + const char *fmt, ...) __printf(4, 5); + +/* Object release is RCU protected. */ +int qcomtee_object_get(struct qcomtee_object *object); +void qcomtee_object_put(struct qcomtee_object *object); + +#define qcomtee_arg_for_each(i, args) \ + for (i = 0; args[i].type != QCOMTEE_ARG_TYPE_INV; i++) + +/* Next argument of type @type after index @i. */ +int qcomtee_next_arg_type(struct qcomtee_arg *u, int i, + enum qcomtee_arg_type type); + +/* Iterate over argument of given type. */ +#define qcomtee_arg_for_each_type(i, args, at) \ + for (i = qcomtee_next_arg_type(args, 0, at); \ + args[i].type != QCOMTEE_ARG_TYPE_INV; \ + i = qcomtee_next_arg_type(args, i + 1, at)) + +#define qcomtee_arg_for_each_input_buffer(i, args) \ + qcomtee_arg_for_each_type(i, args, QCOMTEE_ARG_TYPE_IB) +#define qcomtee_arg_for_each_output_buffer(i, args) \ + qcomtee_arg_for_each_type(i, args, QCOMTEE_ARG_TYPE_OB) +#define qcomtee_arg_for_each_input_object(i, args) \ + qcomtee_arg_for_each_type(i, args, QCOMTEE_ARG_TYPE_IO) +#define qcomtee_arg_for_each_output_object(i, args) \ + qcomtee_arg_for_each_type(i, args, QCOMTEE_ARG_TYPE_OO) + +struct qcomtee_object * +qcomtee_object_get_client_env(struct qcomtee_object_invoke_ctx *oic); + +struct qcomtee_object * +qcomtee_object_get_service(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *client_env, u32 uid); + +#endif /* QCOMTEE_OBJECT_H */ diff --git a/drivers/tee/qcomtee/shm.c b/drivers/tee/qcomtee/shm.c new file mode 100644 index 000000000000..2aea76487372 --- /dev/null +++ b/drivers/tee/qcomtee/shm.c @@ -0,0 +1,153 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/firmware/qcom/qcom_tzmem.h> +#include <linux/mm.h> + +#include "qcomtee.h" + +/** + * define MAX_OUTBOUND_BUFFER_SIZE - Maximum size of outbound buffers. + * + * The size of outbound buffer depends on QTEE callback requests. + */ +#define MAX_OUTBOUND_BUFFER_SIZE SZ_4K + +/** + * define MAX_INBOUND_BUFFER_SIZE - Maximum size of the inbound buffer. + * + * The size of the inbound buffer depends on the user's requests, + * specifically the number of IB and OB arguments. If an invocation + * requires a size larger than %MAX_INBOUND_BUFFER_SIZE, the user should + * consider using another form of shared memory with QTEE. + */ +#define MAX_INBOUND_BUFFER_SIZE SZ_4M + +/** + * qcomtee_msg_buffers_alloc() - Allocate inbound and outbound buffers. + * @oic: context to use for the current invocation. + * @u: array of arguments for the current invocation. + * + * It calculates the size of inbound and outbound buffers based on the + * arguments in @u. It allocates the buffers from the teedev pool. + * + * Return: On success, returns 0. On error, returns < 0. + */ +int qcomtee_msg_buffers_alloc(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_arg *u) +{ + struct tee_context *ctx = oic->ctx; + struct tee_shm *shm; + size_t size; + int i; + + /* Start offset in a message for buffer arguments. */ + size = qcomtee_msg_buffer_args(struct qcomtee_msg_object_invoke, + qcomtee_args_len(u)); + if (size > MAX_INBOUND_BUFFER_SIZE) + return -EINVAL; + + /* Add size of IB arguments. */ + qcomtee_arg_for_each_input_buffer(i, u) { + size = size_add(size, qcomtee_msg_offset_align(u[i].b.size)); + if (size > MAX_INBOUND_BUFFER_SIZE) + return -EINVAL; + } + + /* Add size of OB arguments. */ + qcomtee_arg_for_each_output_buffer(i, u) { + size = size_add(size, qcomtee_msg_offset_align(u[i].b.size)); + if (size > MAX_INBOUND_BUFFER_SIZE) + return -EINVAL; + } + + shm = tee_shm_alloc_priv_buf(ctx, size); + if (IS_ERR(shm)) + return PTR_ERR(shm); + + /* Allocate inbound buffer. */ + oic->in_shm = shm; + shm = tee_shm_alloc_priv_buf(ctx, MAX_OUTBOUND_BUFFER_SIZE); + if (IS_ERR(shm)) { + tee_shm_free(oic->in_shm); + + return PTR_ERR(shm); + } + /* Allocate outbound buffer. */ + oic->out_shm = shm; + + oic->in_msg.addr = tee_shm_get_va(oic->in_shm, 0); + oic->in_msg.size = tee_shm_get_size(oic->in_shm); + oic->out_msg.addr = tee_shm_get_va(oic->out_shm, 0); + oic->out_msg.size = tee_shm_get_size(oic->out_shm); + /* QTEE assume unused buffers are zeroed. */ + memzero_explicit(oic->in_msg.addr, oic->in_msg.size); + memzero_explicit(oic->out_msg.addr, oic->out_msg.size); + + return 0; +} + +void qcomtee_msg_buffers_free(struct qcomtee_object_invoke_ctx *oic) +{ + tee_shm_free(oic->in_shm); + tee_shm_free(oic->out_shm); +} + +/* Dynamic shared memory pool based on tee_dyn_shm_alloc_helper(). */ + +static int qcomtee_shm_register(struct tee_context *ctx, struct tee_shm *shm, + struct page **pages, size_t num_pages, + unsigned long start) +{ + return qcom_tzmem_shm_bridge_create(shm->paddr, shm->size, + &shm->sec_world_id); +} + +static int qcomtee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm) +{ + qcom_tzmem_shm_bridge_delete(shm->sec_world_id); + + return 0; +} + +static int pool_op_alloc(struct tee_shm_pool *pool, struct tee_shm *shm, + size_t size, size_t align) +{ + if (!(shm->flags & TEE_SHM_PRIV)) + return -ENOMEM; + + return tee_dyn_shm_alloc_helper(shm, size, align, qcomtee_shm_register); +} + +static void pool_op_free(struct tee_shm_pool *pool, struct tee_shm *shm) +{ + tee_dyn_shm_free_helper(shm, qcomtee_shm_unregister); +} + +static void pool_op_destroy_pool(struct tee_shm_pool *pool) +{ + kfree(pool); +} + +static const struct tee_shm_pool_ops pool_ops = { + .alloc = pool_op_alloc, + .free = pool_op_free, + .destroy_pool = pool_op_destroy_pool, +}; + +struct tee_shm_pool *qcomtee_shm_pool_alloc(void) +{ + struct tee_shm_pool *pool; + + pool = kzalloc(sizeof(*pool), GFP_KERNEL); + if (!pool) + return ERR_PTR(-ENOMEM); + + pool->ops = &pool_ops; + + return pool; +} diff --git a/drivers/tee/qcomtee/user_obj.c b/drivers/tee/qcomtee/user_obj.c new file mode 100644 index 000000000000..0139905f2684 --- /dev/null +++ b/drivers/tee/qcomtee/user_obj.c @@ -0,0 +1,692 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/slab.h> +#include <linux/uaccess.h> + +#include "qcomtee.h" + +/** + * DOC: User Objects aka Supplicants + * + * Any userspace process with access to the TEE device file can behave as a + * supplicant by creating a user object. Any TEE parameter of type OBJREF with + * %QCOMTEE_OBJREF_FLAG_USER flag set is considered a user object. + * + * A supplicant uses qcomtee_user_object_select() (i.e. TEE_IOC_SUPPL_RECV) to + * receive a QTEE user object request and qcomtee_user_object_submit() + * (i.e. TEE_IOC_SUPPL_SEND) to submit a response. QTEE expects to receive the + * response, including OB and OO in a specific order in the message; parameters + * submitted with qcomtee_user_object_submit() should maintain this order. + */ + +/** + * struct qcomtee_user_object - User object. + * @object: &struct qcomtee_object representing the user object. + * @ctx: context for which the user object is defined. + * @object_id: object ID in @ctx. + * @notify: notify on release. + * + * Any object managed in userspace is represented by this struct. + * If @notify is set, a notification message is sent back to userspace + * upon release. + */ +struct qcomtee_user_object { + struct qcomtee_object object; + struct tee_context *ctx; + u64 object_id; + bool notify; +}; + +#define to_qcomtee_user_object(o) \ + container_of((o), struct qcomtee_user_object, object) + +static struct qcomtee_object_operations qcomtee_user_object_ops; + +/* Is it a user object? */ +int is_qcomtee_user_object(struct qcomtee_object *object) +{ + return object != NULL_QCOMTEE_OBJECT && + typeof_qcomtee_object(object) == QCOMTEE_OBJECT_TYPE_CB && + object->ops == &qcomtee_user_object_ops; +} + +/* Set the user object's 'notify on release' flag. */ +void qcomtee_user_object_set_notify(struct qcomtee_object *object, bool notify) +{ + if (is_qcomtee_user_object(object)) + to_qcomtee_user_object(object)->notify = notify; +} + +/* Supplicant Requests: */ + +/** + * enum qcomtee_req_state - Current state of request. + * @QCOMTEE_REQ_QUEUED: Request is waiting for supplicant. + * @QCOMTEE_REQ_PROCESSING: Request has been picked by the supplicant. + * @QCOMTEE_REQ_PROCESSED: Response has been submitted for the request. + */ +enum qcomtee_req_state { + QCOMTEE_REQ_QUEUED = 1, + QCOMTEE_REQ_PROCESSING, + QCOMTEE_REQ_PROCESSED, +}; + +/* User requests sent to supplicants. */ +struct qcomtee_ureq { + enum qcomtee_req_state state; + + /* User Request: */ + int req_id; + u64 object_id; + u32 op; + struct qcomtee_arg *args; + int errno; + + struct list_head node; + struct completion c; /* Completion for whoever wait. */ +}; + +/* + * Placeholder for a PROCESSING request in qcomtee_context.reqs_idr. + * + * If the thread that calls qcomtee_object_invoke() dies and the supplicant + * is processing the request, replace the entry in qcomtee_context.reqs_idr + * with empty_ureq. This ensures that (1) the req_id remains busy and is not + * reused, and (2) the supplicant fails to submit the response and performs + * the necessary rollback. + */ +static struct qcomtee_ureq empty_ureq = { .state = QCOMTEE_REQ_PROCESSING }; + +/* Enqueue a user request for a context and assign a request ID. */ +static int ureq_enqueue(struct qcomtee_context_data *ctxdata, + struct qcomtee_ureq *ureq) +{ + int ret; + + guard(mutex)(&ctxdata->reqs_lock); + /* Supplicant is dying. */ + if (ctxdata->released) + return -ENODEV; + + /* Allocate an ID and queue the request. */ + ret = idr_alloc(&ctxdata->reqs_idr, ureq, 0, 0, GFP_KERNEL); + if (ret < 0) + return ret; + + ureq->req_id = ret; + ureq->state = QCOMTEE_REQ_QUEUED; + list_add_tail(&ureq->node, &ctxdata->reqs_list); + + return 0; +} + +/** + * ureq_dequeue() - Dequeue a user request from a context. + * @ctxdata: context data for a context to dequeue the request. + * @req_id: ID of the request to be dequeued. + * + * It dequeues a user request and releases its request ID. + * + * Context: The caller should hold &qcomtee_context_data->reqs_lock. + * Return: Returns the user request associated with this ID; otherwise, NULL. + */ +static struct qcomtee_ureq *ureq_dequeue(struct qcomtee_context_data *ctxdata, + int req_id) +{ + struct qcomtee_ureq *ureq; + + ureq = idr_remove(&ctxdata->reqs_idr, req_id); + if (ureq == &empty_ureq || !ureq) + return NULL; + + list_del(&ureq->node); + + return ureq; +} + +/** + * ureq_select() - Select the next request in a context. + * @ctxdata: context data for a context to pop a request. + * @ubuf_size: size of the available buffer for UBUF parameters. + * @num_params: number of entries for the TEE parameter array. + * + * It checks if @num_params is large enough to fit the next request arguments. + * It checks if @ubuf_size is large enough to fit IB buffer arguments. + * + * Context: The caller should hold &qcomtee_context_data->reqs_lock. + * Return: On success, returns a request; + * on failure, returns NULL and ERR_PTR. + */ +static struct qcomtee_ureq *ureq_select(struct qcomtee_context_data *ctxdata, + size_t ubuf_size, int num_params) +{ + struct qcomtee_ureq *req, *ureq = NULL; + struct qcomtee_arg *u; + int i; + + /* Find the a queued request. */ + list_for_each_entry(req, &ctxdata->reqs_list, node) { + if (req->state == QCOMTEE_REQ_QUEUED) { + ureq = req; + break; + } + } + + if (!ureq) + return NULL; + + u = ureq->args; + /* (1) Is there enough TEE parameters? */ + if (num_params < qcomtee_args_len(u)) + return ERR_PTR(-EINVAL); + /* (2) Is there enough space to pass input buffers? */ + qcomtee_arg_for_each_input_buffer(i, u) { + ubuf_size = size_sub(ubuf_size, u[i].b.size); + if (ubuf_size == SIZE_MAX) + return ERR_PTR(-EINVAL); + + ubuf_size = round_down(ubuf_size, 8); + } + + return ureq; +} + +/* Gets called when the user closes the device. */ +void qcomtee_requests_destroy(struct qcomtee_context_data *ctxdata) +{ + struct qcomtee_ureq *req, *ureq; + + guard(mutex)(&ctxdata->reqs_lock); + /* So ureq_enqueue() refuses new requests from QTEE. */ + ctxdata->released = true; + /* ureqs in reqs_list are in QUEUED or PROCESSING (!= empty_ureq) state. */ + list_for_each_entry_safe(ureq, req, &ctxdata->reqs_list, node) { + ureq_dequeue(ctxdata, ureq->req_id); + + if (ureq->op != QCOMTEE_MSG_OBJECT_OP_RELEASE) { + ureq->state = QCOMTEE_REQ_PROCESSED; + ureq->errno = -ENODEV; + + complete(&ureq->c); + } else { + kfree(ureq); + } + } +} + +/* User Object API. */ + +/* User object dispatcher. */ +static int qcomtee_user_object_dispatch(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *object, u32 op, + struct qcomtee_arg *args) +{ + struct qcomtee_user_object *uo = to_qcomtee_user_object(object); + struct qcomtee_context_data *ctxdata = uo->ctx->data; + struct qcomtee_ureq *ureq __free(kfree) = NULL; + int errno; + + ureq = kzalloc(sizeof(*ureq), GFP_KERNEL); + if (!ureq) + return -ENOMEM; + + init_completion(&ureq->c); + ureq->object_id = uo->object_id; + ureq->op = op; + ureq->args = args; + + /* Queue the request. */ + if (ureq_enqueue(ctxdata, ureq)) + return -ENODEV; + /* Wakeup supplicant to process it. */ + complete(&ctxdata->req_c); + + /* + * Wait for the supplicant to process the request. Wait as KILLABLE + * in case the supplicant and invoke thread are both running from the + * same process, the supplicant crashes, or the shutdown sequence + * starts with supplicant dies first; otherwise, it stuck indefinitely. + * + * If the supplicant processes long-running requests, also use + * TASK_FREEZABLE to allow the device to safely suspend if needed. + */ + if (!wait_for_completion_state(&ureq->c, + TASK_KILLABLE | TASK_FREEZABLE)) { + errno = ureq->errno; + if (!errno) + oic->data = no_free_ptr(ureq); + } else { + enum qcomtee_req_state prev_state; + + errno = -ENODEV; + + scoped_guard(mutex, &ctxdata->reqs_lock) { + prev_state = ureq->state; + /* Replace with empty_ureq to keep req_id reserved. */ + if (prev_state == QCOMTEE_REQ_PROCESSING) { + list_del(&ureq->node); + idr_replace(&ctxdata->reqs_idr, + &empty_ureq, ureq->req_id); + + /* Remove as supplicant has never seen this request. */ + } else if (prev_state == QCOMTEE_REQ_QUEUED) { + ureq_dequeue(ctxdata, ureq->req_id); + } + } + + /* Supplicant did some work, do not discard it. */ + if (prev_state == QCOMTEE_REQ_PROCESSED) { + errno = ureq->errno; + if (!errno) + oic->data = no_free_ptr(ureq); + } + } + + return errno; +} + +/* Gets called after submitting the dispatcher response. */ +static void qcomtee_user_object_notify(struct qcomtee_object_invoke_ctx *oic, + struct qcomtee_object *unused_object, + int err) +{ + struct qcomtee_ureq *ureq = oic->data; + struct qcomtee_arg *u = ureq->args; + int i; + + /* + * If err, there was a transport issue, and QTEE did not receive the + * response for the dispatcher. Release the callback object created for + * QTEE, in addition to the copies of objects kept for the drivers. + */ + qcomtee_arg_for_each_output_object(i, u) { + if (err && + (typeof_qcomtee_object(u[i].o) == QCOMTEE_OBJECT_TYPE_CB)) + qcomtee_object_put(u[i].o); + qcomtee_object_put(u[i].o); + } + + kfree(ureq); +} + +static void qcomtee_user_object_release(struct qcomtee_object *object) +{ + struct qcomtee_user_object *uo = to_qcomtee_user_object(object); + struct qcomtee_context_data *ctxdata = uo->ctx->data; + struct qcomtee_ureq *ureq; + + /* RELEASE does not require any argument. */ + static struct qcomtee_arg args[] = { { .type = QCOMTEE_ARG_TYPE_INV } }; + + if (!uo->notify) + goto out_no_notify; + + ureq = kzalloc(sizeof(*ureq), GFP_KERNEL); + if (!ureq) + goto out_no_notify; + + /* QUEUE a release request: */ + ureq->object_id = uo->object_id; + ureq->op = QCOMTEE_MSG_OBJECT_OP_RELEASE; + ureq->args = args; + if (ureq_enqueue(ctxdata, ureq)) { + kfree(ureq); + /* Ignore the notification if it cannot be queued. */ + goto out_no_notify; + } + + complete(&ctxdata->req_c); + +out_no_notify: + teedev_ctx_put(uo->ctx); + kfree(uo); +} + +static struct qcomtee_object_operations qcomtee_user_object_ops = { + .release = qcomtee_user_object_release, + .notify = qcomtee_user_object_notify, + .dispatch = qcomtee_user_object_dispatch, +}; + +/** + * qcomtee_user_param_to_object() - OBJREF parameter to &struct qcomtee_object. + * @object: object returned. + * @param: TEE parameter. + * @ctx: context in which the conversion should happen. + * + * @param is an OBJREF with %QCOMTEE_OBJREF_FLAG_USER flags. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_user_param_to_object(struct qcomtee_object **object, + struct tee_param *param, + struct tee_context *ctx) +{ + struct qcomtee_user_object *user_object __free(kfree) = NULL; + int err; + + user_object = kzalloc(sizeof(*user_object), GFP_KERNEL); + if (!user_object) + return -ENOMEM; + + user_object->ctx = ctx; + user_object->object_id = param->u.objref.id; + /* By default, always notify userspace upon release. */ + user_object->notify = true; + err = qcomtee_object_user_init(&user_object->object, + QCOMTEE_OBJECT_TYPE_CB, + &qcomtee_user_object_ops, "uo-%llu", + param->u.objref.id); + if (err) + return err; + /* Matching teedev_ctx_put() is in qcomtee_user_object_release(). */ + teedev_ctx_get(ctx); + + *object = &no_free_ptr(user_object)->object; + + return 0; +} + +/* Reverse what qcomtee_user_param_to_object() does. */ +int qcomtee_user_param_from_object(struct tee_param *param, + struct qcomtee_object *object, + struct tee_context *ctx) +{ + struct qcomtee_user_object *uo; + + uo = to_qcomtee_user_object(object); + /* Ensure the object is in the same context as the caller. */ + if (uo->ctx != ctx) + return -EINVAL; + + param->u.objref.id = uo->object_id; + param->u.objref.flags = QCOMTEE_OBJREF_FLAG_USER; + + /* User objects are valid in userspace; do not keep a copy. */ + qcomtee_object_put(object); + + return 0; +} + +/** + * qcomtee_cb_params_from_args() - Convert QTEE arguments to TEE parameters. + * @params: TEE parameters. + * @u: QTEE arguments. + * @num_params: number of elements in the parameter array. + * @ubuf_addr: user buffer for arguments of type %QCOMTEE_ARG_TYPE_IB. + * @ubuf_size: size of the user buffer. + * @ctx: context in which the conversion should happen. + * + * It expects @params to have enough entries for @u. Entries in @params are of + * %TEE_IOCTL_PARAM_ATTR_TYPE_NONE. + * + * Return: On success, returns the number of input parameters; + * on failure, returns < 0. + */ +static int qcomtee_cb_params_from_args(struct tee_param *params, + struct qcomtee_arg *u, int num_params, + void __user *ubuf_addr, size_t ubuf_size, + struct tee_context *ctx) +{ + int i, np; + void __user *uaddr; + + qcomtee_arg_for_each(i, u) { + switch (u[i].type) { + case QCOMTEE_ARG_TYPE_IB: + params[i].attr = TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT; + + /* Underflow already checked in ureq_select(). */ + ubuf_size = round_down(ubuf_size - u[i].b.size, 8); + uaddr = (void __user *)(ubuf_addr + ubuf_size); + + params[i].u.ubuf.uaddr = uaddr; + params[i].u.ubuf.size = u[i].b.size; + if (copy_to_user(params[i].u.ubuf.uaddr, u[i].b.addr, + u[i].b.size)) + goto out_failed; + + break; + case QCOMTEE_ARG_TYPE_OB: + params[i].attr = TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT; + /* Let the user knows the maximum size QTEE expects. */ + params[i].u.ubuf.size = u[i].b.size; + + break; + case QCOMTEE_ARG_TYPE_IO: + params[i].attr = TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT; + if (qcomtee_objref_from_arg(&params[i], &u[i], ctx)) + goto out_failed; + + break; + case QCOMTEE_ARG_TYPE_OO: + params[i].attr = + TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT; + + break; + default: /* Never get here! */ + goto out_failed; + } + } + + return i; + +out_failed: + /* Undo qcomtee_objref_from_arg(). */ + for (np = i; np >= 0; np--) { + if (params[np].attr == TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT) + qcomtee_context_del_qtee_object(&params[np], ctx); + } + + /* Release any IO objects not processed. */ + for (; u[i].type; i++) { + if (u[i].type == QCOMTEE_ARG_TYPE_IO) + qcomtee_object_put(u[i].o); + } + + return -EINVAL; +} + +/** + * qcomtee_cb_params_to_args() - Convert TEE parameters to QTEE arguments. + * @u: QTEE arguments. + * @params: TEE parameters. + * @num_params: number of elements in the parameter array. + * @ctx: context in which the conversion should happen. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +static int qcomtee_cb_params_to_args(struct qcomtee_arg *u, + struct tee_param *params, int num_params, + struct tee_context *ctx) +{ + int i; + + qcomtee_arg_for_each(i, u) { + switch (u[i].type) { + case QCOMTEE_ARG_TYPE_IB: + if (params[i].attr != + TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_INPUT) + goto out_failed; + + break; + case QCOMTEE_ARG_TYPE_OB: + if (params[i].attr != + TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT) + goto out_failed; + + /* Client can not send more data than requested. */ + if (params[i].u.ubuf.size > u[i].b.size) + goto out_failed; + + if (copy_from_user(u[i].b.addr, params[i].u.ubuf.uaddr, + params[i].u.ubuf.size)) + goto out_failed; + + u[i].b.size = params[i].u.ubuf.size; + + break; + case QCOMTEE_ARG_TYPE_IO: + if (params[i].attr != + TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT) + goto out_failed; + + break; + case QCOMTEE_ARG_TYPE_OO: + if (params[i].attr != + TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT) + goto out_failed; + + if (qcomtee_objref_to_arg(&u[i], &params[i], ctx)) + goto out_failed; + + break; + default: /* Never get here! */ + goto out_failed; + } + } + + return 0; + +out_failed: + /* Undo qcomtee_objref_to_arg(). */ + for (i--; i >= 0; i--) { + if (u[i].type != QCOMTEE_ARG_TYPE_OO) + continue; + + qcomtee_user_object_set_notify(u[i].o, false); + if (typeof_qcomtee_object(u[i].o) == QCOMTEE_OBJECT_TYPE_CB) + qcomtee_object_put(u[i].o); + + qcomtee_object_put(u[i].o); + } + + return -EINVAL; +} + +/** + * qcomtee_user_object_select() - Select a request for a user object. + * @ctx: context to look for a user object. + * @params: parameters for @op. + * @num_params: number of elements in the parameter array. + * @uaddr: user buffer for output UBUF parameters. + * @size: size of user buffer @uaddr. + * @data: information for the selected request. + * + * @params is filled along with @data for the selected request. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_user_object_select(struct tee_context *ctx, + struct tee_param *params, int num_params, + void __user *uaddr, size_t size, + struct qcomtee_user_object_request_data *data) +{ + struct qcomtee_context_data *ctxdata = ctx->data; + struct qcomtee_ureq *ureq; + int ret; + + /* + * Hold the reqs_lock not only for ureq_select() and updating the ureq + * state to PROCESSING but for the entire duration of ureq access. + * This prevents qcomtee_user_object_dispatch() from freeing + * ureq while it is still in use, if client dies. + */ + + while (1) { + scoped_guard(mutex, &ctxdata->reqs_lock) { + ureq = ureq_select(ctxdata, size, num_params); + if (!ureq) + goto wait_for_request; + + if (IS_ERR(ureq)) + return PTR_ERR(ureq); + + /* Processing the request 'QUEUED -> PROCESSING'. */ + ureq->state = QCOMTEE_REQ_PROCESSING; + /* ''Prepare user request:'' */ + data->id = ureq->req_id; + data->object_id = ureq->object_id; + data->op = ureq->op; + ret = qcomtee_cb_params_from_args(params, ureq->args, + num_params, uaddr, + size, ctx); + if (ret >= 0) + goto done_request; + + /* Something is wrong with the request: */ + ureq_dequeue(ctxdata, data->id); + /* Send error to QTEE. */ + ureq->state = QCOMTEE_REQ_PROCESSED; + ureq->errno = ret; + + complete(&ureq->c); + } + + continue; +wait_for_request: + /* Wait for a new QUEUED request. */ + if (wait_for_completion_interruptible(&ctxdata->req_c)) + return -ERESTARTSYS; + } + +done_request: + /* No one is waiting for the response. */ + if (data->op == QCOMTEE_MSG_OBJECT_OP_RELEASE) { + scoped_guard(mutex, &ctxdata->reqs_lock) + ureq_dequeue(ctxdata, data->id); + kfree(ureq); + } + + data->np = ret; + + return 0; +} + +/** + * qcomtee_user_object_submit() - Submit a response for a user object. + * @ctx: context to look for a user object. + * @params: returned parameters. + * @num_params: number of elements in the parameter array. + * @req_id: request ID for the response. + * @errno: result of user object invocation. + * + * Return: On success, returns 0; on failure, returns < 0. + */ +int qcomtee_user_object_submit(struct tee_context *ctx, + struct tee_param *params, int num_params, + int req_id, int errno) +{ + struct qcomtee_context_data *ctxdata = ctx->data; + struct qcomtee_ureq *ureq; + + /* See comments for reqs_lock in qcomtee_user_object_select(). */ + guard(mutex)(&ctxdata->reqs_lock); + + ureq = ureq_dequeue(ctxdata, req_id); + if (!ureq) + return -EINVAL; + + ureq->state = QCOMTEE_REQ_PROCESSED; + + if (!errno) + ureq->errno = qcomtee_cb_params_to_args(ureq->args, params, + num_params, ctx); + else + ureq->errno = errno; + /* Return errno if qcomtee_cb_params_to_args() failed; otherwise 0. */ + if (!errno && ureq->errno) + errno = ureq->errno; + else + errno = 0; + + /* Send result to QTEE. */ + complete(&ureq->c); + + return errno; +} diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h index 5e393080fda1..d406ff809130 100644 --- a/include/uapi/linux/tee.h +++ b/include/uapi/linux/tee.h @@ -59,6 +59,7 @@ #define TEE_IMPL_ID_OPTEE 1 #define TEE_IMPL_ID_AMDTEE 2 #define TEE_IMPL_ID_TSTEE 3 +#define TEE_IMPL_ID_QTEE 4

/* * OP-TEE specific capabilities