On Sun, Feb 02, 2025 at 06:43:34PM -0800, Amirreza Zarrabi wrote:
> 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 the kernel by issuing a callback
> request, which invokes an instance of qcomtee_object in the kernel.
> Any subsystem that exposes a service to QTEE should allocate and initialize
> an instance of qcomtee_object with a dispatcher callback that is called
> when the object is invoked.
>
> 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.
>
> Signed-off-by: Amirreza Zarrabi <quic_azarrabi@xxxxxxxxxxx>
> ---
> drivers/tee/Kconfig | 1 +
> drivers/tee/Makefile | 1 +
> drivers/tee/qcomtee/Kconfig | 10 +
> drivers/tee/qcomtee/Makefile | 9 +
> drivers/tee/qcomtee/async.c | 160 +++++++
> drivers/tee/qcomtee/call.c | 741 ++++++++++++++++++++++++++++++
> drivers/tee/qcomtee/core.c | 803 +++++++++++++++++++++++++++++++++
> drivers/tee/qcomtee/qcom_scm.c | 36 ++
> drivers/tee/qcomtee/qcomtee_msg.h | 234 ++++++++++
> drivers/tee/qcomtee/qcomtee_private.h | 223 +++++++++
> drivers/tee/qcomtee/release.c | 59 +++
> drivers/tee/qcomtee/shm.c | 102 +++++
> drivers/tee/qcomtee/user_obj.c | 712 +++++++++++++++++++++++++++++
> include/linux/firmware/qcom/qcom_tee.h | 286 ++++++++++++
> include/uapi/linux/tee.h | 1 +
> 15 files changed, 3378 insertions(+)
>
> diff --git a/drivers/tee/Kconfig b/drivers/tee/Kconfig
> index 61b507c18780..3a995d7f0d74 100644
> --- a/drivers/tee/Kconfig
> +++ b/drivers/tee/Kconfig
> @@ -16,5 +16,6 @@ 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..d180a6d07d33
> --- /dev/null
> +++ b/drivers/tee/qcomtee/Kconfig
> @@ -0,0 +1,10 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +# Qualcomm Trusted Execution Environment Configuration
> +config QCOMTEE
> + tristate "Qualcomm TEE Support"
> + select QCOM_SCM
> + help
> + This option enables the Qualcomm Trusted Execution Environment (QTEE)
> + driver. It provides an API to access services offered by QTEE and any
> + loaded Trusted Applications (TAs), as well as exporting kernel
> + services to QTEE.
> diff --git a/drivers/tee/qcomtee/Makefile b/drivers/tee/qcomtee/Makefile
> new file mode 100644
> index 000000000000..1b14b943e5f5
> --- /dev/null
> +++ b/drivers/tee/qcomtee/Makefile
> @@ -0,0 +1,9 @@
> +# 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 += qcom_scm.o
> +qcomtee-objs += release.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..4c880c3441a2
> --- /dev/null
> +++ b/drivers/tee/qcomtee/async.c
> @@ -0,0 +1,160 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include "qcomtee_private.h"
> +#include "qcomtee_msg.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 QCOMTEE_ASYNC_VERSION_1_2 /* Current Version. */
> +
> +#define QCOMTEE_ASYNC_VERSION_MAJOR(n) upper_16_bits(n)
> +#define QCOMTEE_ASYNC_VERSION_MINOR(n) lower_16_bits(n)
> +
> +/**
> + * 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(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;
> +
> + 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);
> +
> + if (QCOMTEE_ASYNC_VERSION_MAJOR(async_msg->version) !=
> + QCOMTEE_ASYNC_VERSION_MAJOR(QCOMTEE_ASYNC_VERSION))
> + goto out;
> +
> + switch (async_msg->op) {
> + case QCOMTEE_MSG_OBJECT_OP_RELEASE:
> + consumed = async_release(oic, async_msg,
> + async_buffer.size - used);
> + break;
> + default:
> + goto out;
> + }
> +
> + /* Supported operation but unable to parse the message. */
> + if (!consumed)
> + 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..ca2feefcc446
> --- /dev/null
> +++ b/drivers/tee/qcomtee/call.c
> @@ -0,0 +1,741 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/tee.h>
> +#include <linux/platform_device.h>
> +
> +#include "qcomtee_private.h"
> +#include "qcomtee_msg.h" // For QCOMTEE_MSG_ERROR_UNAVAIL.
> +
> +/**
> + * enum qcomtee_object_host - Object host where it is managed.
> + * @QCOMTEE_OBJECT_HOST_USER: objects in userspace.
> + * @QCOMTEE_OBJECT_HOST_TEE: objects in QTEE.
> + *
> + * We refer to objects hosted in userspace as 'Local Objects' and objects
> + * hosted in QTEE as 'Remote Objects'.
> + */
> +enum qcomtee_object_host {
> + QCOMTEE_OBJECT_HOST_USER, /* Object that is managed in userspace. */
> + QCOMTEE_OBJECT_HOST_TEE, /* Object that is managed in QTEE. */
> +};
> +
> +/* Read object host information. */
> +static enum qcomtee_object_host qcomtee_object_host(struct tee_param *param)
> +{
> + if (param->u.objref.flags & QCOMTEE_OBJREF_FLAG_USER)
> + return QCOMTEE_OBJECT_HOST_USER;
> + return QCOMTEE_OBJECT_HOST_TEE;
> +}
> +
> +static int find_qtee_object(struct qcomtee_object **object, unsigned long id,
> + struct qcomtee_context_data *ctxdata)
> +{
> + int err = 0;
> +
> + guard(rcu)();
I'm sorry, I can't review this since I don't know what it means.
> + /* 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(spinlock, &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;
> +
> + guard(spinlock)(&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_USER. */
> + param->u.objref.flags = 0;
> +
> + 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;
> +
> + /* 'qtee_objects_idr' stores QTEE objects only. */
> + if (qcomtee_object_host(param) != QCOMTEE_OBJECT_HOST_TEE)
> + return -EINVAL;
> +
> + 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 (qcomtee_object_host(param) == QCOMTEE_OBJECT_HOST_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)
> +{
> + struct qcomtee_object *object;
> + int err;
> +
> + if (arg->type != QCOMTEE_ARG_TYPE_IO &&
> + arg->type != QCOMTEE_ARG_TYPE_OO)
> + return -EINVAL;
> +
> + /* It is a NULL object?! */
> + if (param->u.objref.id == TEE_OBJREF_NULL) {
> + arg->o = NULL_QCOMTEE_OBJECT;
> +
> + return 0;
> + }
> +
> + switch (qcomtee_object_host(param)) {
> + case QCOMTEE_OBJECT_HOST_USER:
> + err = qcomtee_user_param_to_object(&object, param, ctx);
> + if (err)
> + break;
> +
> + /*
> + * QTEE may release an object using an async message.
> + * The async message may release this object even before the
> + * invocation returns. Keep a copy for the driver to be safe.
> + */
> + qcomtee_object_get(object);
> +
> + break;
> + case QCOMTEE_OBJECT_HOST_TEE:
> + err = qcomtee_context_find_qtee_object(&object, param, ctx);
> +
> + break;
> + }
> +
> + arg->o = err ? NULL_QCOMTEE_OBJECT : object;
> +
> + 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;
> + int err;
> +
> + /* param should be of OBJREF. */
> + if (param->attr != TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT &&
> + param->attr != TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT &&
> + param->attr != TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INOUT)
> + return -EINVAL;
> +
> + object = arg->o;
> +
> + switch (typeof_qcomtee_object(object)) {
> + case QCOMTEE_OBJECT_TYPE_NULL:
> + param->u.objref.id = TEE_OBJREF_NULL;
> + err = 0;
> +
> + break;
> + case QCOMTEE_OBJECT_TYPE_CB:
> + err = qcomtee_user_param_from_object(param, object, ctx);
> +
> + break;
> + case QCOMTEE_OBJECT_TYPE_TEE:
> + err = qcomtee_context_add_qtee_object(param, object, ctx);
> +
> + break;
> + case QCOMTEE_OBJECT_TYPE_ROOT:
> + default:
> + return -EINVAL;
> + }
> +
> + return err;
> +}
> +
> +/**
> + * 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], ¶ms[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);
> + 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) {
> + if (u[np].type == QCOMTEE_ARG_TYPE_OB) {
> + /* TEE_IOCTL_PARAM_ATTR_TYPE_UBUF_OUTPUT */
> + params[np].u.value.b = u[np].b.size;
> +
> + } else if (u[np].type == QCOMTEE_ARG_TYPE_IO) {
> + /* IEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_INPUT */
> + qcomtee_object_put(u[np].o);
> +
> + } else if (u[np].type == QCOMTEE_ARG_TYPE_OO) {
> + /* TEE_IOCTL_PARAM_ATTR_TYPE_OBJREF_OUTPUT */
> + if (qcomtee_objref_from_arg(¶ms[np], &u[np], ctx))
> + goto out_failed;
> + }
> + }
> +
> + 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(¶ms[i], ctx);
> + }
> +
> + /* Release any IO and OO objects not processed. */
> + for (; u[i].type; 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 accepts 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 accepts 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 == 4 || op == 8 || op == 9)
Magic number, please use defines.
> + return -EINVAL;
> +
> + /*
> + * OP 5 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 == 5 && num_params == 2) {
More magic numbers.
> + 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_OBJREF_OP_RELEASE) {
> + del_qtee_object(arg->object, ctxdata);
> +
> + return 0;
> + } else if (arg->op > QCOMTEE_OBJREF_OP_MIN) {
> + return -EINVAL;
> + }
> +
> + /* Otherwise, invoke a QTEE object: */
> +
> + oic = kzalloc(sizeof(*oic), GFP_KERNEL);
> + 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->object == 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->object, 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;
> + }
> +
> + 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.
> + */
> + 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;
> +
> + /* We expect the first parameter to 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)
> +{
> + if (!num_params)
> + return -EINVAL;
> +
> + /* We expect the first parameter to be an OUTPUT + meta parameter. */
> + if (params->attr != (TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT |
> + TEE_IOCTL_PARAM_ATTR_META))
> + return -EINVAL;
> +
> + /* Process TEE parameters. +/-1 to ignore the meta parameter. */
> + return qcomtee_user_object_submit(ctx, params + 1, num_params - 1,
> + params->u.value.a, 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;
> +
> + idr_init(&ctxdata->qtee_objects_idr);
> + spin_lock_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;
> +}
> +
> +/* This is called when the user closes the context. */
That is, when the device is closed for clarity.
> +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);
> +}
> +
> +/* This is 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);
> +}
> +
> +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;
> +}
> +
> +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 qcomtee *qcomtee __free(kfree) = NULL;
> + struct tee_device *teedev;
> + int err;
> +
> + qcomtee = kzalloc(sizeof(*qcomtee), GFP_KERNEL);
> + if (!qcomtee)
> + return -ENOMEM;
> +
> + err = qcomtee_release_init();
> + if (err)
> + return err;
> +
> + err = qcomtee_msg_buffers_init();
> + if (err)
> + goto err_release_destroy;
> +
> + teedev = tee_device_alloc(&qcomtee_desc, NULL, NULL, NULL);
> + if (IS_ERR(teedev)) {
> + err = PTR_ERR(teedev);
> +
> + goto err_msg_buffers_destroy;
> + }
> +
> + qcomtee->teedev = teedev;
> +
> + err = tee_device_register(qcomtee->teedev);
> + if (err)
> + goto err_unreg_teedev;
> +
> + platform_set_drvdata(pdev, no_free_ptr(qcomtee));
> + return 0;
> +
> +err_unreg_teedev:
> + tee_device_unregister(qcomtee->teedev);
> +err_msg_buffers_destroy:
> + qcomtee_msg_buffers_destroy();
> +err_release_destroy:
> + qcomtee_release_destroy();
> +
> + 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.
> + */
> +static void qcomtee_remove(struct platform_device *pdev)
> +{
> + struct qcomtee *qcomtee = platform_get_drvdata(pdev);
> +
> + tee_device_unregister(qcomtee->teedev);
> +
> + /*
> + * 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.
> + *
> + * Wait for RELEASE operations to be processed for QTEE objects.
> + */
> + qcomtee_release_destroy();
> +
> + qcomtee_msg_buffers_destroy();
> + 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..9dbfcf62678e
> --- /dev/null
> +++ b/drivers/tee/qcomtee/core.c
> @@ -0,0 +1,803 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/xarray.h>
> +
> +#include "qcomtee_msg.h"
> +#include "qcomtee_private.h"
> +
> +/* This is the QTEE root object. */
> +struct qcomtee_object qcomtee_object_root = {
> + .name = "root",
> + .object_type = QCOMTEE_OBJECT_TYPE_ROOT,
> + .info.qtee_id = QCOMTEE_MSG_OBJECT_ROOT,
> +};
> +EXPORT_SYMBOL_GPL(qcomtee_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 (UINT_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_object_alloc(void)
> +{
> + struct qcomtee_object *object;
> +
> + object = kzalloc(sizeof(*object), GFP_KERNEL);
> + if (object) {
> + QCOMTEE_OBJECT_SET(object, QCOMTEE_OBJECT_TYPE_NULL);
> + kref_init(&object->refcount);
> + }
> +
> + return object;
> +}
> +
> +void qcomtee_object_free(struct qcomtee_object *object)
> +{
> + kfree(object->name);
> + kfree(object);
> +}
> +
> +static void qcomtee_object_release(struct kref *refcount)
> +{
> + struct qcomtee_object *object;
> + const char *name;
> +
> + object = container_of(refcount, struct qcomtee_object, refcount);
> +
> + synchronize_rcu();
I thought you would save RCU stuff for a later optimization.
> +
> + switch (typeof_qcomtee_object(object)) {
> + case QCOMTEE_OBJECT_TYPE_TEE:
> + qcomtee_release_tee_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.
> + */
> +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;
> +}
> +EXPORT_SYMBOL_GPL(qcomtee_object_get);
> +
> +/**
> + * 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);
> +}
> +EXPORT_SYMBOL_GPL(qcomtee_object_put);
> +
> +/*
> + * ''Local Object Table''.
> + * Objects from the kernel exported to QTEE are assigned an ID and stored
> + * in xa_qcom_local_objects (also known as the kernel object table).
> + * QTEE uses this ID to reference the objects using qcomtee_local_object_get().
> + */
> +static DEFINE_XARRAY_ALLOC(xa_qcom_local_objects);
> +
> +static int qcomtee_idx_alloc(u32 *idx, struct qcomtee_object *object)
> +{
> + static u32 xa_last_id = QCOMTEE_OBJECT_ID_START;
> +
> + /* Every ID allocated here has QCOMTEE_MSG_OBJECT_NS_BIT set. */
> + return xa_alloc_cyclic(&xa_qcom_local_objects, idx, object,
> + XA_LIMIT(QCOMTEE_OBJECT_ID_START,
> + QCOMTEE_OBJECT_ID_END),
> + &xa_last_id, GFP_KERNEL);
> +}
> +
> +struct qcomtee_object *qcomtee_idx_erase(u32 idx)
> +{
> + if (idx < QCOMTEE_OBJECT_ID_START || idx > QCOMTEE_OBJECT_ID_END)
> + return NULL_QCOMTEE_OBJECT;
> +
> + return xa_erase(&xa_qcom_local_objects, idx);
> +}
> +
> +/**
> + * qcomtee_object_id_get() - Get an ID for an object to send to QTEE.
> + * @object: object to assign an ID.
> + * @object_id: object ID.
> + *
> + * This is 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 *object,
> + unsigned int *object_id)
> +{
> + u32 idx;
> +
> + switch (typeof_qcomtee_object(object)) {
> + case QCOMTEE_OBJECT_TYPE_CB:
> + if (qcomtee_idx_alloc(&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(unsigned int object_id)
> +{
> + qcomtee_idx_erase(object_id);
> +}
> +
> +/**
> + * qcomtee_local_object_get() - Get the object referenced by the ID.
> + * @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(unsigned int object_id)
> +{
> + struct qcomtee_object *object;
> +
> + /*
> + * This is not protected by an RCU read lock because we are
> + * confident that QTEE does not issue a RELEASE request and
> + * qcomtee_local_object_get() concurrently.
> + */
> + object = xa_load(&xa_qcom_local_objects, object_id);
> +
> + 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;
> +}
> +EXPORT_SYMBOL_GPL(qcomtee_object_user_init);
> +
> +/**
> + * qcomtee_object_type() - Returns the type of object represented by an ID.
> + * @object_id: object ID for the object.
> + *
> + * This is 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.
> + * @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 **object,
> + unsigned int object_id)
> +{
> + struct qcomtee_object *qto;
> + int ret = 0;
> +
> + switch (qcomtee_object_type(object_id)) {
> + case QCOMTEE_OBJECT_TYPE_NULL:
> + *object = NULL_QCOMTEE_OBJECT;
> +
> + break;
> + case QCOMTEE_OBJECT_TYPE_CB:
> + qto = qcomtee_local_object_get(object_id);
> + if (qto != NULL_QCOMTEE_OBJECT)
> + *object = qto;
> + else
> + ret = -EINVAL;
> +
> + break;
> + case QCOMTEE_OBJECT_TYPE_TEE:
> + qto = qcomtee_object_alloc();
> + if (qto) {
> + /* If failed, "no-name". */
> + qto->name =
> + kasprintf(GFP_KERNEL, "qcomtee-%u", object_id);
> + QCOMTEE_OBJECT_SET(qto, QCOMTEE_OBJECT_TYPE_TEE,
> + object_id);
> +
> + *object = qto;
> + } else {
> + ret = -ENOMEM;
> + }
> +
> + break;
> + default:
> + break;
> + }
> +
> + if (ret)
> + *object = NULL_QCOMTEE_OBJECT;
> +
> + 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 off;
> +
> + /* Use the input message buffer in 'oic'. */
> + msg = (struct qcomtee_msg_object_invoke *)oic->in_msg.addr;
> +
> + /* Start offset in a message for buffer arguments. */
> + off = 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(object, &object_id))
> + return -ENOSPC;
> +
> + ib = 0;
> + qcomtee_arg_for_each_input_buffer(i, u) {
> + void *ptr;
> +
> + /* Overflow already checked in qcomtee_msg_buffers_alloc(). */
> + msg->args[ib].b.offset = off;
> + msg->args[ib].b.size = u[i].b.size;
> +
> + ptr = qcomtee_msg_offset_to_ptr(msg, off);
> + /* Userspace client or kernel client!? */
> + if (!(u[i].flags & QCOMTEE_ARG_FLAGS_UADDR))
> + memcpy(ptr, u[i].b.addr, u[i].b.size);
> + else if (copy_from_user(ptr, u[i].b.uaddr, u[i].b.size))
> + return -EINVAL;
> +
> + off += 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 = off;
> + msg->args[ob].b.size = u[i].b.size;
> +
> + off += qcomtee_msg_offset_align(u[i].b.size);
> + ob++;
> + }
> +
> + io = ob;
> + qcomtee_arg_for_each_input_object(i, u) {
> + if (qcomtee_object_id_get(u[i].o, &msg->args[io].o)) {
> + /* Put whatever we got. */
> + qcomtee_object_id_put(object_id);
> + for (io--; io >= ob; io--)
> + qcomtee_object_id_put(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 = (struct qcomtee_msg_object_invoke *)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 *ptr;
> +
> + /* QTEE can override the size to a smaller value. */
> + u[i].b.size = msg->args[ob].b.size;
> +
> + ptr = 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, ptr, u[i].b.size);
> + else if (copy_to_user(u[i].b.uaddr, ptr, 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(&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;
> + union qcomtee_msg_arg *arg;
> + int i, ret = 0;
> +
> + /* Use the output message buffer in 'oic'. */
> + msg = (struct qcomtee_msg_callback *)oic->out_msg.addr;
> +
> + qcomtee_msg_for_each_input_buffer(i, msg) {
> + arg = &msg->args[i];
> + oic->u[i].b.addr =
> + qcomtee_msg_offset_to_ptr(msg, arg->b.offset);
> + oic->u[i].b.size = arg->b.size;
> + oic->u[i].type = QCOMTEE_ARG_TYPE_IB;
> + }
> +
> + qcomtee_msg_for_each_output_buffer(i, msg) {
> + arg = &msg->args[i];
> + oic->u[i].b.addr =
> + qcomtee_msg_offset_to_ptr(msg, arg->b.offset);
> + oic->u[i].b.size = arg->b.size;
> + oic->u[i].type = QCOMTEE_ARG_TYPE_OB;
> + }
> +
> + qcomtee_msg_for_each_input_object(i, msg) {
> + if (qcomtee_object_qtee_init(&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 = (struct qcomtee_msg_callback *)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->u[i].o, &msg->args[oo].o)) {
> + /* Put whatever we got. */
> + for (oo--; oo >= io; oo--)
> + qcomtee_object_id_put(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(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(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;
> +}
> +
> +/**
> + * 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 error, returns -EAGAIN if invocation
> + * failed and the user may retry the invocation, -ENODEV on fatal failure.
> + */
> +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. */
> + if (qcomtee_msg_buffers_alloc(oic, u)) {
> + qcomtee_qtee_objects_put(u);
> +
> + return -EAGAIN;
> + }
> +
> + if (qcomtee_prepare_msg(oic, object, op, u)) {
> + qcomtee_qtee_objects_put(u);
> +
> + ret = -EAGAIN;
> + goto out;
> + }
> +
> + /* Use input message buffer in 'oic'. */
> + cb_msg = (struct qcomtee_msg_callback *)oic->out_msg.addr;
No need to cast a void pointer.
> +
> + 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);
> +
> + if (oic->flags & QCOMTEE_OIC_FLAG_BUSY) {
> + qto = oic->object;
> + if (qto) {
> + if (oic->flags & QCOMTEE_OIC_FLAG_NOTIFY) {
> + /* Don't care about the exact errno. */
> + 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) {
> + if (!(oic->flags & QCOMTEE_OIC_FLAG_SHARED)) {
> + qcomtee_qtee_objects_put(u);
> +
> + ret = -EAGAIN;
> + } else {
> + /*
> + * On error, there is no clean way to exit.
> + * For some reason, we cannot communicate with
> + * QTEE, so we cannot notify QTEE about the
> + * failure and do further cleanup.
> + */
> + 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) {
> + if (!*result) {
> + ret = qcomtee_update_args(u, oic);
> + if (ret) {
> + /* Put output objects. Retry. */
> + qcomtee_arg_for_each_output_object(i, u)
> + qcomtee_object_put(u[i].o);
> +
> + ret = -EAGAIN;
> + }
> + }
> +
> + 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);
> +}
> +EXPORT_SYMBOL_GPL(qcomtee_object_do_invoke);
> diff --git a/drivers/tee/qcomtee/qcom_scm.c b/drivers/tee/qcomtee/qcom_scm.c
> new file mode 100644
> index 000000000000..c49cb675e702
> --- /dev/null
> +++ b/drivers/tee/qcomtee/qcom_scm.c
> @@ -0,0 +1,36 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include <linux/firmware/qcom/qcom_scm.h>
> +
> +#include "qcomtee_private.h"
> +
> +int qcomtee_object_invoke_ctx_invoke(struct qcomtee_object_invoke_ctx *oic,
> + int *result, u64 *res_type)
> +{
> + int ret;
> + u64 res;
> +
> + if (!(oic->flags & QCOMTEE_OIC_FLAG_BUSY)) {
> + /* Direct QTEE object invocation. */
> + ret = qcom_scm_qtee_invoke_smc(oic->in_msg_paddr,
> + oic->in_msg.size,
> + oic->out_msg_paddr,
> + oic->out_msg.size,
> + &res, res_type);
> + } else {
> + /* Submit callback response. */
> + ret = qcom_scm_qtee_callback_response(oic->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;
> +}
> diff --git a/drivers/tee/qcomtee/qcomtee_msg.h b/drivers/tee/qcomtee/qcomtee_msg.h
> new file mode 100644
> index 000000000000..e1d479fc551c
> --- /dev/null
> +++ b/drivers/tee/qcomtee/qcomtee_msg.h
> @@ -0,0 +1,234 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#ifndef QCOMTEE_MSG_H
> +#define QCOMTEE_MSG_H
> +
> +#include <linux/firmware/qcom/qcom_tee.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. They are not available
> + * outside of this driver. Developers should use qcomtee_object_get()
> + * and qcomtee_object_put() to achieve the same.
> + */
> +
> +#define QCOMTEE_MSG_OBJECT_OP_RELEASE (QCOMTEE_MSG_OBJECT_OP_MASK - 0)
> +#define QCOMTEE_MSG_OBJECT_OP_RETAIN (QCOMTEE_MSG_OBJECT_OP_MASK - 1)
> +
> +/* 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.
> + *
> + * 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[];
> +};
> +
> +/**
> + * 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. */
> +
> +#define QCOMTEE_MSG_NUM_IB(x) ((x) & 0xfU)
> +#define QCOMTEE_MSG_NUM_OB(x) (((x) >> 4) & 0xfU)
> +#define QCOMTEE_MSG_NUM_IO(x) (((x) >> 8) & 0xfU)
> +#define QCOMTEE_MSG_NUM_OO(x) (((x) >> 12) & 0xfU)
> +
> +#define QCOMTEE_MSG_IDX_IB(x) (0U)
> +#define QCOMTEE_MSG_IDX_OB(x) (QCOMTEE_MSG_IDX_IB(x) + QCOMTEE_MSG_NUM_IB(x))
> +#define QCOMTEE_MSG_IDX_IO(x) (QCOMTEE_MSG_IDX_OB(x) + QCOMTEE_MSG_NUM_OB(x))
> +#define QCOMTEE_MSG_IDX_OO(x) (QCOMTEE_MSG_IDX_IO(x) + QCOMTEE_MSG_NUM_IO(x))
> +
> +#define qcomtee_msg_for_each(i, c, type) \
> + for (i = QCOMTEE_MSG_IDX_##type(c); \
> + i < (QCOMTEE_MSG_IDX_##type(c) + QCOMTEE_MSG_NUM_##type(c)); i++)
> +
> +#define qcomtee_msg_for_each_input_buffer(i, m) \
> + qcomtee_msg_for_each(i, (m)->counts, IB)
> +#define qcomtee_msg_for_each_output_buffer(i, m) \
> + qcomtee_msg_for_each(i, (m)->counts, OB)
> +#define qcomtee_msg_for_each_input_object(i, m) \
> + qcomtee_msg_for_each(i, (m)->counts, IO)
> +#define qcomtee_msg_for_each_output_object(i, m) \
> + qcomtee_msg_for_each(i, (m)->counts, OO)
> +
> +/* 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)
> +{
> + msg->counts |= (in_buffer & 0xfU);
> + msg->counts |= ((out_buffer - in_buffer) & 0xfU) << 4;
> + msg->counts |= ((in_object - out_buffer) & 0xfU) << 8;
> + msg->counts |= ((out_object - in_object) & 0xfU) << 12;
> + msg->cxt = cxt;
> + msg->op = op;
> +}
> +
> +/* 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_private.h b/drivers/tee/qcomtee/qcomtee_private.h
> new file mode 100644
> index 000000000000..706c200788a2
> --- /dev/null
> +++ b/drivers/tee/qcomtee/qcomtee_private.h
> @@ -0,0 +1,223 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#ifndef QCOMTEE_PRIVATE_H
> +#define QCOMTEE_PRIVATE_H
> +
> +#include <linux/firmware/qcom/qcom_tee.h>
> +#include <linux/kobject.h>
> +#include <linux/tee_core.h>
> +
> +/* Flags relating to object reference. */
> +#define QCOMTEE_OBJREF_FLAG_USER 1
> +
> +/* Reserved OBJREF operations. */
> +/* These operations are not sent to QTEE and are handled in the driver. */
> +#define QCOMTEE_OBJREF_OP_MIN USHRT_MAX
> +#define QCOMTEE_OBJREF_OP_RELEASE (QCOMTEE_OBJREF_OP_MIN + 1)
> +
> +/**
> + * struct qcomtee - Main service struct.
> + * @teedev: client device.
> + */
> +struct qcomtee {
> + struct tee_device *teedev;
> +};
> +
> +struct qcomtee_object *qcomtee_idx_erase(u32 idx);
> +void qcomtee_object_free(struct qcomtee_object *object);
> +
> +void qcomtee_fetch_async_reqs(struct qcomtee_object_invoke_ctx *oic);
> +
> +int qcomtee_release_init(void);
> +void qcomtee_release_destroy(void);
> +void qcomtee_release_tee_object(struct qcomtee_object *object);
> +
> +int qcomtee_msg_buffers_alloc(struct qcomtee_object_invoke_ctx *oic,
> + struct qcomtee_arg *u);
> +void qcomtee_msg_buffers_free(struct qcomtee_object_invoke_ctx *oic);
> +int qcomtee_msg_buffers_init(void);
> +void qcomtee_msg_buffers_destroy(void);
> +
> +int qcomtee_object_invoke_ctx_invoke(struct qcomtee_object_invoke_ctx *oic,
> + int *result, u64 *res_type);
> +
> +/**
> + * 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 error, returns -EAGAIN if invocation
> + * failed and the user may retry the invocation, -ENODEV on fatal failure.
> + */
> +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: spinlock for @qtee_pbjects_idr.
> + * @reqs_idr: requests currently being processed in this context.
> + * @reqs_list: FIFO for requests.
> + * @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. */
> + spinlock_t 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;
> +
> + int released;
> +};
> +
> +/**
> + * 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);
> +
> +/* 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);
> +
> +/**
> + * 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);
> +
> +/**
> + * 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);
> +
> +/**
> + * 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);
> +
> +/* OBJECTS: */
> +
> +/* (1) User Object API. */
> +
> +/* Is it a user object? */
> +int is_qcomtee_user_object(struct qcomtee_object *object);
> +
> +/* Set the user object's 'notify on release' flag. */
> +void qcomtee_user_object_set_notify(struct qcomtee_object *object, bool notify);
> +
> +/* This is called when there are no more users for the ctxdata. */
> +void qcomtee_requests_destroy(struct qcomtee_context_data *ctxdata);
> +
> +/**
> + * 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);
> +
> +/* 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_request_data {
> + int id; /* ID assigned to the request. */
> + u64 object_id; /* Object ID being invoked by QTEE. */
> + u32 op; /* Requested operation on object. */
> + int np; /* Number of parameters in the request.*/
> +};
> +
> +/**
> + * 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);
> +
> +/**
> + * 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);
> +
> +#endif /* QCOMTEE_PRIVATE_H */
> diff --git a/drivers/tee/qcomtee/release.c b/drivers/tee/qcomtee/release.c
> new file mode 100644
> index 000000000000..5742d3739d4a
> --- /dev/null
> +++ b/drivers/tee/qcomtee/release.c
> @@ -0,0 +1,59 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#include "qcomtee_private.h"
> +#include "qcomtee_msg.h"
> +
> +static struct workqueue_struct *qcomtee_release_wq;
I would have expected this to be part of struct qcomtee
> +
> +static void qcomtee_destroy_user_object(struct work_struct *work)
> +{
> + static struct qcomtee_object_invoke_ctx oic;
> + struct qcomtee_object *object;
> + int ret, result;
> +
> + /* RELEASE does not require any argument. */
> + static struct qcomtee_arg args[] = { { .type = QCOMTEE_ARG_TYPE_INV } };
> +
> + object = container_of(work, struct qcomtee_object, work);
> +
> + ret = qcomtee_object_do_invoke_internal(&oic, object,
> + QCOMTEE_MSG_OBJECT_OP_RELEASE,
> + args, &result);
> +
> + /* Is it safe to retry the release? */
> + if (ret == -EAGAIN) {
> + queue_work(qcomtee_release_wq, &object->work);
> + } else {
> + if (ret || result)
> + pr_err("%s: %s release failed, ret = %d (%x).\n",
> + __func__, qcomtee_object_name(object), ret,
> + result);
> +
> + qcomtee_object_free(object);
> + }
> +}
> +
> +/* qcomtee_release_tee_object puts object in release work queue. */
> +void qcomtee_release_tee_object(struct qcomtee_object *object)
> +{
> + INIT_WORK(&object->work, qcomtee_destroy_user_object);
> + queue_work(qcomtee_release_wq, &object->work);
> +}
> +
> +int qcomtee_release_init(void)
> +{
> + qcomtee_release_wq = alloc_ordered_workqueue("qcomtee_release_wq", 0);
> + if (!qcomtee_release_wq)
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +void qcomtee_release_destroy(void)
> +{
> + /* It drains the wq. */
> + destroy_workqueue(qcomtee_release_wq);
> +}
> diff --git a/drivers/tee/qcomtee/shm.c b/drivers/tee/qcomtee/shm.c
> new file mode 100644
> index 000000000000..a3eace120628
> --- /dev/null
> +++ b/drivers/tee/qcomtee/shm.c
> @@ -0,0 +1,102 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/firmware/qcom/qcom_tzmem.h>
> +#include <linux/mm.h>
> +
> +#include "qcomtee_msg.h"
> +#include "qcomtee_private.h"
> +
> +/**
> + * define MAX_BUFFER_SIZE - Maximum size of inbound and outbound buffers.
> + *
> + * QTEE transport does not impose any restriction on these buffers.
> + * However, if the size of the buffers is larger than %MAX_BUFFER_SIZE,
> + * the user should probably use some other form of shared memory with QTEE.
> + */
> +#define MAX_BUFFER_SIZE SZ_4M
> +
> +/* Pool to allocate inbound and outbound buffers. */
> +static struct qcom_tzmem_pool *tzmem_msg_pool;
I would have expected this to be part of struct qcomtee
> +
> +int qcomtee_msg_buffers_alloc(struct qcomtee_object_invoke_ctx *oic,
> + struct qcomtee_arg *u)
> +{
> + 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_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_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_BUFFER_SIZE)
> + return -EINVAL;
> + }
> +
> + /* QTEE requires inbound buffer size to be page aligned. */
> + size = PAGE_ALIGN(size);
> +
> + oic->in_msg.size = size;
> + oic->in_msg.addr = qcom_tzmem_alloc(tzmem_msg_pool, size, GFP_KERNEL);
> + if (!oic->in_msg.addr)
> + return -EINVAL;
> +
> + oic->out_msg.size = MAX_BUFFER_SIZE;
> + oic->out_msg.addr =
> + qcom_tzmem_alloc(tzmem_msg_pool, MAX_BUFFER_SIZE, GFP_KERNEL);
> + if (!oic->out_msg.addr) {
> + qcom_tzmem_free(oic->in_msg.addr);
> +
> + return -EINVAL;
> + }
> +
> + oic->in_msg_paddr = qcom_tzmem_to_phys(oic->in_msg.addr);
> + oic->out_msg_paddr = qcom_tzmem_to_phys(oic->out_msg.addr);
> +
> + /* 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)
> +{
> + qcom_tzmem_free(oic->in_msg.addr);
> + qcom_tzmem_free(oic->out_msg.addr);
> +}
> +
> +int qcomtee_msg_buffers_init(void)
> +{
> + struct qcom_tzmem_pool_config config = {
> + .policy = QCOM_TZMEM_POLICY_STATIC,
> + .initial_size = SZ_16M
> + };
> +
> + tzmem_msg_pool = qcom_tzmem_pool_new(&config);
> + if (IS_ERR(tzmem_msg_pool))
> + return PTR_ERR(tzmem_msg_pool);
> +
> + return 0;
> +}
> +
> +void qcomtee_msg_buffers_destroy(void)
> +{
> + qcom_tzmem_pool_free(tzmem_msg_pool);
> +}
> diff --git a/drivers/tee/qcomtee/user_obj.c b/drivers/tee/qcomtee/user_obj.c
> new file mode 100644
> index 000000000000..e3ba683dd4e3
> --- /dev/null
> +++ b/drivers/tee/qcomtee/user_obj.c
> @@ -0,0 +1,712 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include "qcomtee_private.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 this user object.
> + * @ctx: context for which the user object is defined.
> + * @object_id: object ID in @ctx.
> + * @nor: notify on release.
> + *
> + * Any object managed in userspace is represented by this struct.
> + * If @nor 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 nor;
> +};
> +
> +#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)->nor = 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, we 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_replace() - Replace a user request.
> + * @ctxdata: context data for a context to replace the request.
> + * @ureq: request to be replaced.
> + * @ureq_new: request to replace it with.
> + *
> + * Context: The caller should hold &qcomtee_context_data->reqs_lock.
> + */
> +static void ureq_replace(struct qcomtee_context_data *ctxdata,
> + struct qcomtee_ureq *ureq,
> + struct qcomtee_ureq *ureq_new)
> +{
> + idr_replace(&ctxdata->reqs_idr, ureq_new, ureq->req_id);
> + /* ureq does not have a valid ID anymore; remove it from the queue. */
> + list_del(&ureq->node);
> +}
> +
> +/**
> + * 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;
> +}
> +
> +/* This is called when there are no more users for the ctxdata. */
> +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 = 1;
> +
> + list_for_each_entry_safe(ureq, req, &ctxdata->reqs_list, node) {
> + ureq_dequeue(ctxdata, ureq->req_id);
> +
> + /*
> + * Terminate requests.
> + * Depending on who enqueues the ureq, there may be someone
> + * waiting for the response or not:
> + */
> + if (ureq->op != QCOMTEE_OBJREF_OP_RELEASE) {
> + /* (1) enqueued by qcomtee_user_object_dispatch(). */
> + ureq->state = QCOMTEE_REQ_PROCESSED;
> + ureq->errno = -ENODEV;
> +
> + complete(&ureq->c);
> + } else {
> + /* (2) enqueued by qcomtee_user_object_release(). */
> + 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.
> + *
> + * The supplicant is expected to process the request in a timely manner.
> + * We wait as KILLABLE in case the supplicant and invoke thread are
> + * both running from the same user process; otherwise, the process
> + * will be stuck on a fatal signal.
> + */
> + if (!wait_for_completion_state(&ureq->c,
> + TASK_KILLABLE | TASK_FREEZABLE)) {
> + errno = ureq->errno;
> + /* On success, notify() frees the request. */
> + 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)
> + ureq_replace(ctxdata, ureq, &empty_ureq);
> +
> + /* 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, we should not discard it. */
> + if (prev_state == QCOMTEE_REQ_PROCESSED) {
> + errno = ureq->errno;
> + /* On success, notify() frees the request. */
> + if (!errno)
> + oic->data = no_free_ptr(ureq);
> + }
> + }
> +
> + return errno;
> +}
> +
> +/* This is 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;
> +
> + qcomtee_arg_for_each_output_object(i, u) {
> + /*
> + * 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.
> + */
> + 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 tee_device *teedev = uo->ctx->teedev;
> + struct qcomtee_ureq *ureq;
> +
> + /* RELEASE does not require any argument. */
> + static struct qcomtee_arg args[] = { { .type = QCOMTEE_ARG_TYPE_INV } };
> +
> + if (!uo->nor)
> + 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_OBJREF_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);
> + tee_device_put(teedev);
> +}
> +
> +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;
> + struct tee_device *teedev = ctx->teedev;
> + int err;
> +
> + user_object = kzalloc(sizeof(*user_object), GFP_KERNEL);
> + if (!user_object)
> + return -ENOMEM;
> +
> + if (!tee_device_get(teedev))
> + return -EINVAL;
> +
> + user_object->ctx = ctx;
> + user_object->object_id = param->u.objref.id;
> + /* By default, always notify userspace upon release. */
> + user_object->nor = true;
> + err = qcomtee_object_user_init(&user_object->object,
> + QCOMTEE_OBJECT_TYPE_CB,
> + &qcomtee_user_object_ops, "uo-%lu",
> + param->u.objref.id);
> + if (err) {
> + tee_device_put(teedev);
> +
> + return err;
> + }
> +
> + 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;
> +
> + if (!is_qcomtee_user_object(object))
> + return -EINVAL;
> +
> + 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 we expect. */
> + 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(¶ms[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(¶ms[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], ¶ms[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);
Why do you need to put it twice for QCOMTEE_OBJECT_TYPE_CB?
> + }
> +
> + 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;
> +
> + 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. */
No special case for data->op == QCOMTEE_OBJREF_OP_RELEASE?
> +
> + 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_OBJREF_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;
> +
> + guard(mutex)(&ctxdata->reqs_lock);
> +
> + ureq = ureq_dequeue(ctxdata, req_id);
> + if (!ureq)
> + return -EINVAL;
> +
> + ureq->state = QCOMTEE_REQ_PROCESSED;
> + ureq->errno = errno ?: qcomtee_cb_params_to_args(ureq->args, params,
> + num_params, ctx);
> +
> + errno = (!errno && ureq->errno) ? ureq->errno : 0;
Please exand the two ternary operations above into regular if statements.
> + /* Send result to QTEE. */
> + complete(&ureq->c);
> +
> + return errno;
> +}
> diff --git a/include/linux/firmware/qcom/qcom_tee.h b/include/linux/firmware/qcom/qcom_tee.h
> new file mode 100644
> index 000000000000..7b2014b40422
> --- /dev/null
> +++ b/include/linux/firmware/qcom/qcom_tee.h
> @@ -0,0 +1,286 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/* Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#ifndef __QCOM_TEE_H
> +#define __QCOM_TEE_H
> +
> +#include <linux/kref.h>
> +#include <linux/completion.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 1
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 {
> + unsigned long flags;
> + int errno;
> +
> + /* Current object invoked in this callback context. */
> + struct qcomtee_object *object;
> +
> + /* Dispatcher argument array (+1 for ending QCOMTEE_ARG_TYPE_INV). */
> + struct qcomtee_arg u[QCOMTEE_ARGS_MAX + 1];
> +
> + /* Inbound and Outbound buffers shared with QTEE. */
> + struct qcomtee_buffer in_msg; /* Inbound Buffer. */
> + phys_addr_t in_msg_paddr; /* Physical addr of inbound buffer. */
> + struct qcomtee_buffer out_msg; /* Outbound Buffer. */
> + phys_addr_t out_msg_paddr; /* Physical addr of outbound buffer. */
> +
> + /* Extra data attached to this context. */
> + void *data;
> +};
> +
> +/**
> + * 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 error, returns -EAGAIN if invocation
> + * failed and the user may retry the invocation, -ENODEV on fatal failure.
> + */
> +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;
> + union object_info {
> + unsigned long qtee_id;
> + } 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, ...);
> +
> +/* 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++)
Is seems a bit backward to search for a NIL element when you already
know the length of the array.
> +
> +/* 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 = 0, i = qcomtee_next_arg_type(args, i, at); \
> + args[i].type != QCOMTEE_ARG_TYPE_INV; \
> + i++, i = qcomtee_next_arg_type(args, i, 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)
> +
> +#endif /* __QCOM_TEE_H */
> diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h
> index 0aef647d4a34..c5584ade4915 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
>
> --
> 2.34.1
>
