[PATCH v2 3/3] tee: add MbedTEE driver
Xing Loong
xing.xl.loong at gmail.com
Thu Jul 2 08:11:15 PDT 2026
This patch adds a Linux TEE driver that communicates with
MbedTEE OS, a Trusted Execution Environment for embedded
systems (https://github.com/mbedtee) via a fixed shared-memory
RPC protocol over architecture-specific transports:
- ARM/ARM64: SMCCC fast/yield calls for REE-to-TEE requests;
TEE-to-REE notifications via a GIC SPI edge interrupt.
- RISC-V: REE submits commands by writing to a shared-memory
r2t-ring that the TEE polls; the TEE notifies the REE by
writing to t2r-ring and raising a platform IMSIC MSI.
No REE-to-TEE interrupt is used.
The driver implements the TEE subsystem interface (tee_driver_ops)
and provides GlobalPlatform TEE Client API support, dynamic shared
memory registration, and tee-supplicant support.
Signed-off-by: Xing Loong <xing.xl.loong at gmail.com>
---
Changes in v2:
- Fix supp_release incorrectly aborting unclaimed requests on close
- Fix potential tee_shm double-free on supp_recv error path
- Fix async RPC ring skip leaving orphaned payload bytes
- Fix COMPLETE_TEE retry to also handle transient -ENOMEM on RISC-V
- Fix session leak on close_session allocation failure:
release kernel resources before sending RPC
---
Documentation/tee/index.rst | 1 +
Documentation/tee/mbedtee.rst | 155 +++++++
MAINTAINERS | 9 +
drivers/tee/Kconfig | 3 +-
drivers/tee/Makefile | 1 +
drivers/tee/mbedtee/Kconfig | 20 +
drivers/tee/mbedtee/Makefile | 11 +
drivers/tee/mbedtee/core.c | 236 ++++++++++
drivers/tee/mbedtee/mbedtee_drv.h | 269 +++++++++++
drivers/tee/mbedtee/mbedtee_msg.h | 219 +++++++++
drivers/tee/mbedtee/rpc_callee.c | 618 +++++++++++++++++++++++++
drivers/tee/mbedtee/rpc_callee_arm.c | 91 ++++
drivers/tee/mbedtee/rpc_callee_riscv.c | 203 ++++++++
drivers/tee/mbedtee/rpc_caller.c | 532 +++++++++++++++++++++
drivers/tee/mbedtee/rpc_caller_arm.c | 66 +++
drivers/tee/mbedtee/rpc_caller_riscv.c | 192 ++++++++
drivers/tee/mbedtee/shm_pool.c | 105 +++++
drivers/tee/mbedtee/shm_pool.h | 15 +
drivers/tee/mbedtee/supp.c | 310 +++++++++++++
include/uapi/linux/tee.h | 1 +
20 files changed, 3056 insertions(+), 1 deletion(-)
create mode 100644 Documentation/tee/mbedtee.rst
create mode 100644 drivers/tee/mbedtee/Kconfig
create mode 100644 drivers/tee/mbedtee/Makefile
create mode 100644 drivers/tee/mbedtee/core.c
create mode 100644 drivers/tee/mbedtee/mbedtee_drv.h
create mode 100644 drivers/tee/mbedtee/mbedtee_msg.h
create mode 100644 drivers/tee/mbedtee/rpc_callee.c
create mode 100644 drivers/tee/mbedtee/rpc_callee_arm.c
create mode 100644 drivers/tee/mbedtee/rpc_callee_riscv.c
create mode 100644 drivers/tee/mbedtee/rpc_caller.c
create mode 100644 drivers/tee/mbedtee/rpc_caller_arm.c
create mode 100644 drivers/tee/mbedtee/rpc_caller_riscv.c
create mode 100644 drivers/tee/mbedtee/shm_pool.c
create mode 100644 drivers/tee/mbedtee/shm_pool.h
create mode 100644 drivers/tee/mbedtee/supp.c
diff --git a/Documentation/tee/index.rst b/Documentation/tee/index.rst
index 10c3cec..6415855 100644
--- a/Documentation/tee/index.rst
+++ b/Documentation/tee/index.rst
@@ -12,3 +12,4 @@ TEE Subsystem
amd-tee
ts-tee
qtee
+ mbedtee
diff --git a/Documentation/tee/mbedtee.rst b/Documentation/tee/mbedtee.rst
new file mode 100644
index 0000000..dfb57b8
--- /dev/null
+++ b/Documentation/tee/mbedtee.rst
@@ -0,0 +1,155 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+==============================================
+MbedTEE (Trusted Execution Environment)
+==============================================
+
+The MbedTEE driver supports MbedTEE-based TEEs on ARM TrustZone (SMC calls,
+GIC SPI notifications) and RISC-V IMSIC (shared-memory polling, MSI
+notifications) platforms.
+
+The driver requires the REE and TEE CPUs that share the RPC shared memory to
+be hardware coherent. In practice, the REE/TEE CPUs are expected to be in the
+same CPU cluster, with coherent caches and shared visibility for the ring and
+payload buffers.
+
+Communication overview
+======================
+
+The driver communicates with the TEE using a fixed shared-memory RPC protocol
+layered above the architecture-specific call mechanism.
+
+ARM platforms (SMC)
+-------------------
+
+On ARM and AArch64 platforms, the driver uses ARM SMC Calling Convention
+(SMCCC) to issue fast calls and yield calls to the TEE:
+
+- **Fast calls** (MBEDTEE_RPC_OS_VERSION, MBEDTEE_RPC_SUPPORT_YIELD,
+ MBEDTEE_RPC_COMPLETE_TEE) are self-contained SMC calls that do
+ not rely on shared-memory RPC structures.
+
+- **Yield calls** post the physical address of an ``rpc_cmd`` structure
+ in shared memory to the TEE. The TEE may issue RPC requests back to the
+ driver before the call completes; kernel-directed RPCs are handled
+ directly, while supplicant RPCs (filesystem and RPMB) are forwarded to
+ tee-supplicant.
+
+TEE-to-REE notifications on ARM are delivered via a GIC SPI edge interrupt
+specified in the device tree (``interrupts`` property).
+
+RISC-V platforms
+----------------
+
+On RISC-V platforms, SMCCC is not available. Communication is split into two
+directions:
+
+- **REE to TEE (R2T)**: The driver submits commands by writing the physical
+ address of an ``rpc_cmd`` structure to a REE-to-TEE ring buffer
+ (``r2t-ring``). The TEE polls that ring for new commands. No interrupt
+ notification is sent; the protocol relies on TEE-side polling.
+
+- **TEE to REE (T2R)**: The TEE writes an ``rpc_cmd`` into the TEE-to-REE
+ ring and raises an IMSIC MSI to notify the REE driver. The MSI is
+ allocated at runtime via the ``msi-parent`` DT property and its identity
+ is published in ``callee_imsic_id``; ``callee_hartid`` tracks the
+ target hart for migration during CPU hotplug. No SBI ecall is involved.
+
+RISC-V REE-to-TEE polling rationale
+-----------------------------------
+
+The REE-to-TEE direction uses polling-only on RISC-V to avoid direct
+notification interrupt writes from Linux to TEE-owned interrupt files.
+This design is platform-independent and does not require ownership of
+TEE-only hart interrupt files. The TEE-to-REE direction remains fully
+functional via standard Linux MSI notifications and does not depend on
+REE-to-TEE notification latency.
+
+Shared memory regions
+=====================
+
+Two or three fixed shared memory regions are described in the device tree:
+
+``t2r-ring``
+ Ring buffer used by the TEE to post RPC request notifications to the REE
+ driver. Present on all platforms.
+
+``t2r-shm``
+ Shared memory region carrying the actual ``rpc_cmd`` payloads for
+ TEE-to-REE RPCs. Present on all platforms.
+
+``r2t-ring``
+ Ring buffer used by the REE driver to submit commands to the TEE on
+ RISC-V IMSIC platforms.
+
+RPC protocol
+============
+
+The TEE and REE communicate through the ``rpc_cmd`` structure in shared memory
+and ring buffers::
+
+ struct rpc_cmd {
+ u32 id; /* RPC function ID */
+ u16 size; /* payload size in bytes */
+ u8 interrupted; /* set if wait was interrupted */
+ u8 reserved; /* explicit alignment padding */
+ s32 ret; /* return value */
+ u32 pad; /* explicit alignment padding */
+ u64 waiter_id; /* sync RPC request ID echoed on completion */
+ u64 shm; /* physical address of payload (sync RPC) */
+ u64 data[]; /* inline payload (async RPC) */
+ };
+
+ struct rpc_ringbuf {
+ u32 wr; /* producer write pointer */
+ u32 rd; /* consumer read pointer */
+ u32 callee_ready; /* callee ready flag */
+ u32 callee_imsic_id; /* RISC-V only: IMSIC local interrupt id */
+ u32 callee_hartid; /* RISC-V only: target hart-id for T2R notification */
+ u32 reserved; /* padding, must be zero */
+ u8 mem[];
+ };
+
+For RISC-V T2R MSI, one MSI message targets one hart IMSIC file at a time.
+The wire-visible state is split between ``callee_imsic_id`` and
+``callee_hartid`` in the ring header; Linux may retarget the MSI across
+online CPUs via ``irq_set_affinity()``, and the driver updates those fields
+to match the selected hart.
+
+
+
+Architecture diagram::
+
+ User space Kernel TEE side
+ ~~~~~~~~~~ ~~~~~~ ~~~~~~~~~~~~
+ +--------+ +--------------+
+ | Client | | Trusted App |
+ +--------+ +--------------+
+ /\ /\
+ || +------------+ ||
+ || | MbedTEE- | \/
+ || | supplicant | +--------------+
+ || +------------+ | TEE Internal |
+ \/ /\ | API |
+ +-------+ || +--------------+
+ | TEE | || +---------+---------------+ | MbedTEE |
+ | Client| || | TEE | MbedTEE | | Trusted OS |
+ | API | \/ | subsys | client driver | +--------------+
+ +-------+-------------+-----+--------+----------+----+ |
+ | Generic TEE API | | RPC (cmd/ring)| |
+ | IOCTL (TEE_IOC_*) | | SMC / IMSIC | |
+ +---------------------------+ +---------------+--------------+
+
+Device tree binding
+===================
+
+See Documentation/devicetree/bindings/firmware/mbedtee,tee.yaml for the
+complete device tree binding specification, including the RISC-V
+``msi-parent`` requirement.
+
+References
+==========
+
+- [1] MbedTEE project: https://github.com/mbedtee
+- [2] ARM SMC Calling Convention: https://developer.arm.com/architectures/system-architectures/software-standards/smccc
+- [3] RISC-V IMSIC specification: https://github.com/riscv/riscv-aia
diff --git a/MAINTAINERS b/MAINTAINERS
index c8d4b91..344b82b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15920,6 +15920,15 @@ F: Documentation/devicetree/bindings/net/dsa/maxlinear,mxl862xx.yaml
F: drivers/net/dsa/mxl862xx/
F: net/dsa/tag_mxl862xx.c
+MBEDTEE TEE DRIVER
+M: Xing Loong <xing.xl.loong at gmail.com>
+L: op-tee at lists.trustedfirmware.org (moderated for non-subscribers)
+S: Maintained
+W: https://github.com/mbedtee
+F: Documentation/devicetree/bindings/firmware/mbedtee,tee.yaml
+F: Documentation/tee/mbedtee.rst
+F: drivers/tee/mbedtee/
+
MCAN DEVICE DRIVER
M: Markus Schneider-Pargmann <msp at baylibre.com>
L: linux-can at vger.kernel.org
diff --git a/drivers/tee/Kconfig b/drivers/tee/Kconfig
index 98c3ad0..3dc3439 100644
--- a/drivers/tee/Kconfig
+++ b/drivers/tee/Kconfig
@@ -2,7 +2,7 @@
# Generic Trusted Execution Environment Configuration
menuconfig TEE
tristate "Trusted Execution Environment support"
- depends on HAVE_ARM_SMCCC || COMPILE_TEST || CPU_SUP_AMD
+ depends on HAVE_ARM_SMCCC || RISCV || COMPILE_TEST || CPU_SUP_AMD
select CRYPTO_LIB_SHA1
select DMA_SHARED_BUFFER
select GENERIC_ALLOCATOR
@@ -21,5 +21,6 @@ source "drivers/tee/optee/Kconfig"
source "drivers/tee/amdtee/Kconfig"
source "drivers/tee/tstee/Kconfig"
source "drivers/tee/qcomtee/Kconfig"
+source "drivers/tee/mbedtee/Kconfig"
endif
diff --git a/drivers/tee/Makefile b/drivers/tee/Makefile
index 3239b91..33117ea 100644
--- a/drivers/tee/Makefile
+++ b/drivers/tee/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_OPTEE) += optee/
obj-$(CONFIG_AMDTEE) += amdtee/
obj-$(CONFIG_ARM_TSTEE) += tstee/
obj-$(CONFIG_QCOMTEE) += qcomtee/
+obj-$(CONFIG_MBEDTEE) += mbedtee/
diff --git a/drivers/tee/mbedtee/Kconfig b/drivers/tee/mbedtee/Kconfig
new file mode 100644
index 0000000..b1fa38a
--- /dev/null
+++ b/drivers/tee/mbedtee/Kconfig
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# MbedTEE Trusted Execution Environment Configuration
+config MBEDTEE
+ tristate "MbedTEE"
+ depends on MMU && OF
+ depends on ((ARM || ARM64) && HAVE_ARM_SMCCC) || (RISCV && GENERIC_MSI_IRQ)
+ help
+ This enables the MbedTEE Trusted Execution Environment (TEE)
+ driver.
+
+ The driver supports ARM TrustZone (SMC calls, GIC SPI notifications)
+ and RISC-V IMSIC (shared-memory polling, MSI notifications), with
+ GlobalPlatform client API via /dev/tee*.
+
+ The DT node should be under a firmware node and have compatible =
+ "mbedtee,tee" with the RPC ring buffer addresses and,
+ for ARM/ARM64, an interrupt property for TEE-to-REE notifications.
+ See Documentation/tee/mbedtee.rst for protocol details.
+
+ If unsure, say N.
diff --git a/drivers/tee/mbedtee/Makefile b/drivers/tee/mbedtee/Makefile
new file mode 100644
index 0000000..309eb6d
--- /dev/null
+++ b/drivers/tee/mbedtee/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+obj-$(CONFIG_MBEDTEE) += mbedtee.o
+
+mbedtee-y += core.o
+mbedtee-y += supp.o
+mbedtee-y += shm_pool.o
+mbedtee-y += rpc_caller.o rpc_callee.o
+mbedtee-$(CONFIG_ARM) += rpc_caller_arm.o rpc_callee_arm.o
+mbedtee-$(CONFIG_ARM64) += rpc_caller_arm.o rpc_callee_arm.o
+mbedtee-$(CONFIG_RISCV) += rpc_caller_riscv.o rpc_callee_riscv.o
diff --git a/drivers/tee/mbedtee/core.c b/drivers/tee/mbedtee/core.c
new file mode 100644
index 0000000..5807a93
--- /dev/null
+++ b/drivers/tee/mbedtee/core.c
@@ -0,0 +1,236 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/tee_drv.h>
+#include <linux/types.h>
+
+#include "mbedtee_drv.h"
+#include "shm_pool.h"
+
+int mbedtee_get_resource(struct device_node *node,
+ const char *name, struct resource *res)
+{
+ struct device_node *rmem;
+ int idx;
+ int ret;
+
+ idx = of_property_match_string(node, "memory-region-names", name);
+ if (idx < 0)
+ return idx;
+
+ rmem = of_parse_phandle(node, "memory-region", idx);
+ if (!rmem)
+ return -ENODEV;
+
+ ret = of_address_to_resource(rmem, 0, res);
+ of_node_put(rmem);
+
+ if (ret)
+ return ret;
+
+ res->name = name;
+ return 0;
+}
+
+static void mbedtee_get_version(struct tee_device *teedev,
+ struct tee_ioctl_version_data *vers)
+{
+ struct tee_ioctl_version_data v = {
+ .impl_id = TEE_IMPL_ID_MBEDTEE,
+ .impl_caps = 0,
+ .gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM |
+ TEE_GEN_CAP_MEMREF_NULL,
+ };
+
+ *vers = v;
+}
+
+static int mbedtee_open(struct tee_context *ctx)
+{
+ struct mbedtee_context_data *ctxdata;
+
+ ctxdata = kzalloc_obj(*ctxdata, GFP_KERNEL);
+ if (!ctxdata)
+ return -ENOMEM;
+
+ mutex_init(&ctxdata->mutex);
+ INIT_LIST_HEAD(&ctxdata->sess_list);
+
+ ctx->data = ctxdata;
+ ctx->cap_memref_null = true;
+
+ return 0;
+}
+
+static void mbedtee_release(struct tee_context *ctx)
+{
+ struct mbedtee_device *mbedtee = tee_get_drvdata(ctx->teedev);
+ struct mbedtee_context_data *d = ctx->data;
+ struct mbedtee_session *s, *n;
+
+ if (!d)
+ return;
+
+ if (d->is_supp_ctx) {
+ mbedtee_supp_release(&mbedtee->supp, ctx);
+ } else {
+ list_for_each_entry_safe(s, n, &d->sess_list, list_node)
+ mbedtee_close_session(ctx, s->session_id);
+ }
+
+ kfree(d);
+ ctx->data = NULL;
+}
+
+static const struct tee_driver_ops mbedtee_ops = {
+ .get_version = mbedtee_get_version,
+ .open = mbedtee_open,
+ .release = mbedtee_release,
+ .open_session = mbedtee_open_session,
+ .close_session = mbedtee_close_session,
+ .invoke_func = mbedtee_invoke_func,
+ .cancel_req = mbedtee_cancel_req,
+ .supp_recv = mbedtee_supp_recv,
+ .supp_send = mbedtee_supp_send,
+ .shm_register = mbedtee_shm_register,
+ .shm_unregister = mbedtee_shm_unregister,
+};
+
+static const struct tee_desc mbedtee_desc = {
+ .name = "mbedtee",
+ .ops = &mbedtee_ops,
+ .owner = THIS_MODULE,
+};
+
+static int mbedtee_probe(struct platform_device *pdev)
+{
+ int ret;
+ long version;
+ long yield;
+ struct tee_shm_pool *pool;
+ struct tee_device *teedev;
+ struct mbedtee_device *mbedtee;
+
+ mbedtee = devm_kzalloc(&pdev->dev, sizeof(*mbedtee), GFP_KERNEL);
+ if (!mbedtee)
+ return -ENOMEM;
+
+ mbedtee->dev = &pdev->dev;
+ xa_init_flags(&mbedtee->rpc_calls, XA_FLAGS_ALLOC1);
+ mbedtee_supp_init(&mbedtee->supp);
+
+ /*
+ * R2T must be ready before T2R is advertised: synchronous T2R RPC
+ * work replies with COMPLETE_TEE over the R2T path.
+ */
+ ret = mbedtee_r2t_init(mbedtee);
+ if (ret != 0)
+ goto err_supp;
+
+ ret = mbedtee_rpc_init(mbedtee);
+ if (ret != 0)
+ goto err_r2t;
+
+ version = mbedtee_rpc_fastcall(mbedtee, MBEDTEE_RPC_OS_VERSION, 0, 0, 0);
+ if (version < 0) {
+ dev_err(&pdev->dev, "MBEDTEE_RPC_OS_VERSION failed: %ld\n", version);
+ ret = version;
+ goto err_rpc;
+ }
+
+ if (!MBEDTEE_VALID_VERSION(version)) {
+ dev_err(&pdev->dev, "mbedtee not present (version=0x%lx)\n",
+ version);
+ ret = -ENODEV;
+ goto err_rpc;
+ }
+
+ yield = mbedtee_rpc_fastcall(mbedtee, MBEDTEE_RPC_SUPPORT_YIELD, 0, 0, 0);
+ dev_info(&pdev->dev, "version: 0x%06lx yield: %ld\n", version, yield);
+
+ pool = mbedtee_shm_pool_alloc_pages();
+ if (IS_ERR(pool)) {
+ ret = PTR_ERR(pool);
+ goto err_rpc;
+ }
+
+ teedev = tee_device_alloc(&mbedtee_desc, &pdev->dev, pool, mbedtee);
+ if (IS_ERR(teedev)) {
+ ret = PTR_ERR(teedev);
+ goto err_pool;
+ }
+
+ ret = tee_device_register(teedev);
+ if (ret)
+ goto err_teedev;
+
+ mbedtee->teedev = teedev;
+ mbedtee->version = version;
+ mbedtee->yield = !!yield;
+ mbedtee->pool = pool;
+ platform_set_drvdata(pdev, mbedtee);
+
+ dev_dbg(&pdev->dev, "client initialized\n");
+ return 0;
+
+err_teedev:
+ tee_device_unregister(teedev);
+err_pool:
+ tee_shm_pool_free(pool);
+err_rpc:
+ mbedtee_rpc_uninit(mbedtee);
+err_r2t:
+ mbedtee_r2t_uninit(mbedtee);
+err_supp:
+ mbedtee_supp_uninit(&mbedtee->supp);
+ xa_destroy(&mbedtee->rpc_calls);
+ return ret;
+}
+
+static void mbedtee_remove(struct platform_device *pdev)
+{
+ struct mbedtee_device *mbedtee = platform_get_drvdata(pdev);
+
+ tee_device_unregister(mbedtee->teedev);
+ /*
+ * Drain T2R before tearing down R2T: queued RPC work may still need
+ * to send COMPLETE_TEE over R2T. Destroy the supplicant mutex only
+ * after RPC work can no longer enter mbedtee_supp_handler().
+ */
+ mbedtee_rpc_uninit(mbedtee);
+ mbedtee_r2t_uninit(mbedtee);
+ mbedtee_supp_uninit(&mbedtee->supp);
+ tee_shm_pool_free(mbedtee->pool);
+ xa_destroy(&mbedtee->rpc_calls);
+}
+
+static const struct of_device_id mbedtee_dt_match[] = {
+ { .compatible = "mbedtee,tee" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, mbedtee_dt_match);
+
+static struct platform_driver mbedtee_driver = {
+ .probe = mbedtee_probe,
+ .remove = mbedtee_remove,
+ .driver = {
+ .name = "mbedtee",
+ .of_match_table = mbedtee_dt_match,
+ },
+};
+module_platform_driver(mbedtee_driver);
+
+MODULE_AUTHOR("Xing Loong <xing.xl.loong at gmail.com>");
+MODULE_DESCRIPTION("MbedTEE Trusted Execution Environment driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tee/mbedtee/mbedtee_drv.h b/drivers/tee/mbedtee/mbedtee_drv.h
new file mode 100644
index 0000000..59b5b27
--- /dev/null
+++ b/drivers/tee/mbedtee/mbedtee_drv.h
@@ -0,0 +1,269 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ */
+#ifndef MBEDTEE_DRV_H
+#define MBEDTEE_DRV_H
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/atomic.h>
+#include <linux/of.h>
+#include <linux/ioport.h>
+#include <linux/tee_drv.h>
+#include <linux/tee_core.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/msi.h>
+#include <linux/workqueue.h>
+#include <linux/cpuhotplug.h>
+#include <linux/cpumask.h>
+#include <linux/xarray.h>
+#include "mbedtee_msg.h"
+#include "shm_pool.h"
+
+/*
+ * GlobalPlatform TEE Client API return codes/origins
+ * used by this driver. Only the codes actually
+ * referenced in the driver are defined here.
+ */
+#define TEEC_SUCCESS 0x00000000
+#define TEEC_ERROR_OUT_OF_MEMORY 0xFFFF000C
+#define TEEC_ERROR_COMMUNICATION 0xFFFF000E
+
+#define TEEC_ORIGIN_COMMS 0x00000002
+
+#define MBEDTEE_VERSION_MAJOR 1
+#define MBEDTEE_VALID_VERSION(x) (((x) >> 16) == MBEDTEE_VERSION_MAJOR)
+
+/* Maximum payload size for inline (async) RPC data. */
+#define MBEDTEE_ASYNC_RPC_DATA_MAX 256
+
+struct rpc_transport_ops;
+struct mbedtee_rpc_call;
+struct mbedtee_supp_req;
+struct mbedtee_device;
+
+struct rpc_work {
+ struct work_struct work;
+ struct mbedtee_device *mbedtee;
+ u64 waiter_id;
+ size_t size;
+ bool complete_only;
+ /* Points to ctx->rpc_data (async) or into t2r_shm (sync) */
+ void *data;
+ void (*func)(struct mbedtee_device *mbedtee, void *data, size_t size);
+};
+
+struct mbedtee_t2r_ctx {
+ spinlock_t ring_lock; /* protects T2R ring producer/consumer state */
+ void *t2r_shm;
+ phys_addr_t t2r_shm_phys;
+ resource_size_t t2r_shm_sz;
+ struct rpc_ringbuf *t2r_ring;
+ u32 t2r_ring_sz;
+ u32 t2r_ring_rd;
+
+ void (*rpc_handlers[MBEDTEE_RPC_MAX])(struct mbedtee_device *mbedtee,
+ void *data, size_t size);
+
+ /*
+ * Inline buffer for async RPC payloads (waiter_id == 0).
+ * Sync RPC payloads (waiter_id != 0) live in shared memory (t2r_shm).
+ */
+ u8 rpc_data[MBEDTEE_ASYNC_RPC_DATA_MAX];
+
+ /*
+ * CPU-hotplug tracking for T2R interrupt delivery.
+ * callee_cpus: shadow of cpu_online_mask maintained by the core
+ * callee layer (rpc_callee.c) for both ARM and RISC-V; used by
+ * ARM to feed irq_set_affinity() and by RISC-V as the gate for
+ * MSI migration decisions.
+ * callee_virq: single MSI virq currently pinned to one CPU
+ * (RISC-V IMSIC only; 0 for ARM).
+ * hp_node: per-instance node for cpuhp_setup_state_multi().
+ */
+ struct cpumask callee_cpus;
+ int callee_virq;
+ struct hlist_node hp_node;
+ bool cpuhp_added;
+ bool complete_work_pending;
+ bool pending_async;
+ u32 pending_size;
+ struct workqueue_struct *rpc_wq;
+ struct rpc_work complete_work;
+ void (*pending_func)(struct mbedtee_device *mbedtee,
+ void *data, size_t size);
+};
+
+struct mbedtee_r2t_ctx {
+ spinlock_t lock; /* protects R2T ring write-side state */
+ struct rpc_ringbuf *ring;
+ u32 ring_sz;
+ u32 ring_wr;
+};
+
+struct mbedtee_rpc_transport_ctx {
+ int rpc_notify_virq;
+ struct msi_msg rpc_msi_msg;
+};
+
+struct mbedtee_supp {
+ struct mutex mutex; /* serializes supp request queue and active requests */
+ struct tee_context *ctx;
+ bool shutting_down;
+ struct list_head reqs;
+ struct list_head active_reqs;
+ struct completion reqs_c;
+};
+
+struct mbedtee_device {
+ u32 version;
+ bool yield;
+ struct device *dev;
+ struct tee_device *teedev;
+ struct tee_shm_pool *pool;
+ struct mbedtee_supp supp;
+ struct xarray rpc_calls;
+ atomic_long_t rpc_call_seq;
+ const struct rpc_transport_ops *rpc_ops;
+ struct mbedtee_t2r_ctx t2r;
+ struct mbedtee_r2t_ctx r2t;
+ struct mbedtee_rpc_transport_ctx transport;
+};
+
+struct mbedtee_rpc_call {
+ struct completion c;
+ phys_addr_t rpc_phys;
+ u32 state;
+ /*
+ * Wire-format rpc_cmd with inline data[] payload.
+ * MUST be the last field: rpc.data[] is a flexible array.
+ */
+ struct rpc_cmd rpc;
+};
+
+struct mbedtee_session {
+ struct list_head list_node;
+ u32 session_id;
+};
+
+struct mbedtee_context_data {
+ bool is_supp_ctx;
+ struct mutex mutex; /* serializes session list updates */
+ struct list_head sess_list;
+};
+
+static inline phys_addr_t mbedtee_virt_to_phys(void *va)
+{
+ if (is_vmalloc_or_module_addr(va))
+ return page_to_phys(vmalloc_to_page(va)) +
+ offset_in_page(va);
+
+ return virt_to_phys(va);
+}
+
+int mbedtee_get_resource(struct device_node *node,
+ const char *name, struct resource *res);
+
+/*
+ * RPC transport operations -- implemented per-architecture.
+ *
+ * Caller (rpc_caller_{arm,riscv}.c) platform differences:
+ * fastcall: ARM/ARM64 - direct SMC (arm_smccc_smc), synchronous,
+ * never returns -ENOSPC.
+ * RISC-V - writes rpc_cmd phys addr to the r2t ring
+ * buffer, then waits for TEE completion via the t2r
+ * ring. Despite the "fastcall" name this is a
+ * synchronous ring-buffer round-trip; it may return
+ * -ENOSPC when the r2t ring is full, and the caller
+ * must retry (see rpc_routine() for the
+ * MBEDTEE_RPC_COMPLETE_TEE retry loop).
+ * yieldcall: ARM/ARM64 - one SMC posting rpc_cmd phys addr, waits
+ * for completion.
+ * RISC-V - writes rpc_cmd phys addr to r2t ring, waits
+ * for completion.
+ * Callee (rpc_callee_{arm,riscv}.c) platform differences:
+ * notify: ARM/ARM64 - GIC SPI; the TEE broadcasts via GIC
+ * hardware (GICv2 ITARGETS=0xFF, GICv3 IROUTER.IRM=1).
+ * Ring metadata unchanged on CPU affinity events.
+ * RISC-V - IMSIC MSI; the driver writes callee_hartid
+ * and callee_imsic_id into the ring so the TEE knows
+ * where to send the MSI. The affinity handler updates
+ * both ring fields when the callee CPU goes offline.
+ *
+ * init: Set up the interrupt delivery mechanism (MSI on RISC-V,
+ * GIC/OF-IRQ on ARM/ARM64) and, on RISC-V, write
+ * ring->callee_hartid and ring->callee_imsic_id. @handler
+ * is the hard-IRQ handler that drains the ring buffer and
+ * dispatches RPC commands.
+ * uninit: Tear down and free all interrupt resources.
+ * update_affinity: Migrate T2R interrupt delivery to @new_cpu. Called by the
+ * common cpuhp handler when the current callee CPU goes
+ * offline. On RISC-V IMSIC, must update ring->callee_hartid
+ * and ring->callee_imsic_id. ARM uses GIC hardware routing
+ * and requires no ring update.
+ *
+ * The getter is implemented per-architecture in rpc_callee_{arm,riscv}.c;
+ * only one is linked per build.
+ */
+struct rpc_transport_ops {
+ int (*init)(struct mbedtee_device *mbedtee, struct rpc_ringbuf *ring,
+ irq_handler_t handler);
+ void (*uninit)(struct mbedtee_device *mbedtee);
+ int (*update_affinity)(struct mbedtee_device *mbedtee,
+ unsigned int new_cpu);
+};
+
+const struct rpc_transport_ops *mbedtee_get_rpc_transport_ops(void);
+
+/* rpc-callee.c */
+int mbedtee_rpc_init(struct mbedtee_device *mbedtee);
+void mbedtee_rpc_uninit(struct mbedtee_device *mbedtee);
+irqreturn_t mbedtee_rpc_irq_handler(int irq, void *dev_id);
+
+/* rpc_caller.c */
+int mbedtee_rpc_call_alloc(struct mbedtee_device *mbedtee,
+ size_t payload_size, struct mbedtee_rpc_call **call);
+void mbedtee_rpc_call_free(struct mbedtee_device *mbedtee,
+ struct mbedtee_rpc_call *call);
+void mbedtee_rpc_complete_call(struct mbedtee_device *mbedtee,
+ u64 waiter_id);
+long mbedtee_rpc_wait_for_completion(struct mbedtee_device *mbedtee,
+ struct mbedtee_rpc_call *call, bool killable);
+int mbedtee_open_session(struct tee_context *ctx,
+ struct tee_ioctl_open_session_arg *arg,
+ struct tee_param *param);
+int mbedtee_close_session(struct tee_context *ctx, u32 session);
+int mbedtee_invoke_func(struct tee_context *ctx,
+ struct tee_ioctl_invoke_arg *arg,
+ struct tee_param *param);
+int mbedtee_cancel_req(struct tee_context *ctx, u32 cancel_id,
+ u32 session);
+int mbedtee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
+ struct page **pages, size_t num_pages, unsigned long start);
+int mbedtee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm);
+
+/* rpc-caller-{arm,riscv}.c */
+long mbedtee_rpc_yieldcall(struct mbedtee_device *mbedtee,
+ unsigned long fn, struct mbedtee_rpc_call *call,
+ bool interruptible);
+long mbedtee_rpc_fastcall(struct mbedtee_device *mbedtee,
+ unsigned long fn, unsigned long a0,
+ unsigned long a1, unsigned long a2);
+int mbedtee_r2t_init(struct mbedtee_device *mbedtee);
+void mbedtee_r2t_uninit(struct mbedtee_device *mbedtee);
+
+/* supp.c */
+void mbedtee_supp_init(struct mbedtee_supp *supp);
+void mbedtee_supp_uninit(struct mbedtee_supp *supp);
+void mbedtee_supp_release(struct mbedtee_supp *supp, struct tee_context *ctx);
+void mbedtee_supp_abort_all(struct mbedtee_supp *supp);
+void mbedtee_supp_handler(struct mbedtee_device *mbedtee,
+ u32 func, void *data, size_t size);
+int mbedtee_supp_recv(struct tee_context *ctx, u32 *func,
+ u32 *num_params, struct tee_param *param);
+int mbedtee_supp_send(struct tee_context *ctx, u32 ret,
+ u32 num_params, struct tee_param *param);
+
+#endif /* MBEDTEE_DRV_H */
diff --git a/drivers/tee/mbedtee/mbedtee_msg.h b/drivers/tee/mbedtee/mbedtee_msg.h
new file mode 100644
index 0000000..deb2d8c
--- /dev/null
+++ b/drivers/tee/mbedtee/mbedtee_msg.h
@@ -0,0 +1,219 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ *
+ * MbedTEE RPC wire protocol between REE (Linux) and TEE (MbedTEE OS).
+ *
+ * This header is the Linux-kernel mirror of
+ * mbedtee-os/drivers/rpc/include/rpc/rpc.h. Both copies MUST define
+ * identical struct layouts. The static_assert() checks at the bottom
+ * of this file (and the _Static_assert() checks in rpc.h) enforce this
+ * contract at compile time on every architecture.
+ *
+ * Type mapping (wire -> Linux kernel alias):
+ * uint8_t -> u8 -- boolean flag / padding byte
+ * uint16_t -> u16 -- byte-count field (< 64 KiB payload limit)
+ * uint32_t -> u32 -- 32-bit ID, counter, flag, or enum
+ * int32_t -> s32 -- function-defined signed result code
+ * uint64_t -> u64 -- physical address, kernel pointer token, or size
+ *
+ * Using u64 for all pointer-sized fields eliminates ABI width mismatches
+ * in mixed-width configurations (e.g. RV64 REE + RV32 TEE, or ARM32-LPAE
+ * REE + ARM32 TEE). It also prevents phys_addr_t/unsigned-long confusion
+ * when CONFIG_PHYS_ADDR_T_64BIT=y on a 32-bit REE kernel.
+ */
+
+#ifndef MBEDTEE_MSG_H
+#define MBEDTEE_MSG_H
+
+#include <linux/bits.h>
+#include <linux/build_bug.h>
+#include <linux/types.h>
+
+/*
+ * Fastcall / yield-call classification
+ */
+#define MBEDTEE_RPC_FASTCALL BIT(31)
+#define MBEDTEE_RPC_IS_FASTCALL(fn) ((fn) & MBEDTEE_RPC_FASTCALL)
+
+/*
+ * REE -> TEE fast calls
+ */
+#define MBEDTEE_RPC_OS_VERSION (0x0100 | MBEDTEE_RPC_FASTCALL)
+#define MBEDTEE_RPC_SUPPORT_YIELD (0x0101 | MBEDTEE_RPC_FASTCALL)
+#define MBEDTEE_RPC_COMPLETE_TEE (0x0102 | MBEDTEE_RPC_FASTCALL)
+
+/*
+ * REE -> TEE yield calls
+ */
+#define MBEDTEE_RPC_OPEN_SESSION 1
+#define MBEDTEE_RPC_INVOKE_SESSION 2
+#define MBEDTEE_RPC_CLOSE_SESSION 3
+#define MBEDTEE_RPC_REGISTER_SHM 5
+#define MBEDTEE_RPC_UNREGISTER_SHM 6
+#define MBEDTEE_RPC_CANCEL 7
+
+/*
+ * TEE -> REE RPC calls
+ */
+#define MBEDTEE_RPC_COMPLETE_REE 0
+#define MBEDTEE_RPC_REETIME 1
+#define MBEDTEE_RPC_REEFS 2
+#define MBEDTEE_RPC_RPMB 3
+#define MBEDTEE_RPC_MAX 4
+
+/*
+ * Supplicant types (TEE -> REE -> tee-supplicant)
+ */
+#define MBEDTEE_SUPP_REEFS 1
+#define MBEDTEE_SUPP_RPMB 2
+
+/* MbedTEE RPC protocol uses 4 KiB page units regardless of host PAGE_SIZE. */
+#define MBEDTEE_PAGE_SIZE 4096UL
+
+/*
+ * REE <-> TEE RPC call command (wire format, 32 bytes fixed header).
+ *
+ * Fixed layout:
+ * +0 id u32 - RPC function identifier
+ * +4 size u16 - inline payload byte count (0..65535)
+ * +6 interrupted u8 - set by REE when caller is interrupted
+ * +7 reserved u8 - must be zero (explicit alignment pad)
+ * +8 ret s32 - return value written by callee
+ * +12 pad u32 - must be zero (explicit alignment pad)
+ * +16 waiter_id u64 - sync RPC request ID echoed on completion
+ * +24 shm u64 - physical address of sync-RPC shared memory
+ * +32 data[] u64 - inline payload (waiter_id==0) or empty
+ *
+ * Yield-call contract:
+ * - Session/control RPCs return GlobalPlatform result codes here.
+ * - Host-local errno values must be translated before being put on the wire.
+ * - Fast calls may use function-specific return values.
+ */
+struct rpc_cmd {
+ u32 id;
+ u16 size;
+ u8 interrupted;
+ u8 reserved;
+ s32 ret;
+ u32 pad;
+ u64 waiter_id;
+ u64 shm;
+ u64 data[];
+};
+
+/*
+ * REE -> TEE pages for GP shared memory.
+ *
+ * All fields are u64 so the layout is identical when REE is 64-bit
+ * but TEE is 32-bit (physical addresses, sizes and counts use 64 bits).
+ */
+struct rpc_memref {
+ u64 id;
+ u64 pages;
+ u64 offset;
+ u64 size;
+ u64 cnt;
+};
+
+/*
+ * REE -> TEE parameter entry: value or shared memory reference.
+ */
+union rpc_tee_param {
+ struct rpc_memref memref;
+
+ struct {
+ u32 a;
+ u32 b;
+ } value;
+};
+
+/*
+ * REE -> TEE parameters for RPC session operations
+ * (MBEDTEE_RPC_OPEN_SESSION / MBEDTEE_RPC_INVOKE_SESSION /
+ * MBEDTEE_RPC_CLOSE_SESSION).
+ */
+struct rpc_param {
+ s32 session_id;
+ u32 cmd_id;
+ u32 ret_origin;
+ u32 params_type;
+ union rpc_tee_param params[4];
+ u8 uuid[16];
+ u8 clnt_uuid[16];
+};
+
+/*
+ * REE -> TEE cancellation request (MBEDTEE_RPC_CANCEL).
+ */
+struct rpc_cancel_req {
+ u32 session_id;
+ u32 cancel_id;
+};
+
+/*
+ * TEE <-> REE supplicant payloads for REEFS and RPMB RPCs.
+ * Only the fixed headers are interpreted in the Linux driver.
+ */
+/*
+ * Common supplicant command header. Both reefs_cmd and rpmb_cmd embed this
+ * as their first member so the kernel can write a status code through a
+ * single cast to (struct supp_cmd_hdr *) without caring about the full
+ * payload type. The wire layout is identical on every architecture.
+ */
+struct supp_cmd_hdr {
+ s32 ret;
+ s32 op;
+};
+
+struct reefs_cmd {
+ struct supp_cmd_hdr hdr;
+ s32 flags;
+ s32 fd;
+ u64 len;
+ u8 data[];
+};
+
+struct rpmb_cmd {
+ struct supp_cmd_hdr hdr;
+ u32 nframes;
+ u8 data[];
+};
+
+/*
+ * TEE <-> REE RPC ring buffer header (24 bytes fixed).
+ */
+struct rpc_ringbuf {
+ u32 wr; /* producer write pointer */
+ u32 rd; /* consumer read pointer */
+ u32 callee_ready; /* callee ready flag */
+ u32 callee_imsic_id; /* RISC-V only: IMSIC local interrupt id */
+ u32 callee_hartid; /* RISC-V only: target hart-id for T2R notification */
+ u32 reserved; /* padding, must be zero */
+ u8 mem[];
+};
+
+/*
+ * Compile-time ABI layout assertions.
+ * These must match the _Static_assert() checks in mbedtee-os rpc/rpc.h.
+ */
+static_assert(sizeof(struct rpc_cmd) == 32,
+ "rpc_cmd wire size mismatch");
+static_assert(offsetof(struct rpc_cmd, ret) == 8,
+ "rpc_cmd.ret offset mismatch");
+static_assert(offsetof(struct rpc_cmd, waiter_id) == 16,
+ "rpc_cmd.waiter_id offset mismatch");
+static_assert(offsetof(struct rpc_cmd, shm) == 24,
+ "rpc_cmd.shm offset mismatch");
+static_assert(offsetof(struct rpc_cmd, data) == 32,
+ "rpc_cmd.data offset mismatch");
+static_assert(sizeof(struct rpc_memref) == 40,
+ "rpc_memref wire size mismatch");
+static_assert(sizeof(struct rpc_ringbuf) == 24,
+ "rpc_ringbuf header size mismatch");
+static_assert(sizeof(struct rpc_param) == 208,
+ "rpc_param wire size mismatch");
+static_assert(sizeof(struct rpc_cancel_req) == 8,
+ "rpc_cancel_req wire size mismatch");
+
+#endif /* MBEDTEE_MSG_H */
diff --git a/drivers/tee/mbedtee/rpc_callee.c b/drivers/tee/mbedtee/rpc_callee.c
new file mode 100644
index 0000000..e3373a7
--- /dev/null
+++ b/drivers/tee/mbedtee/rpc_callee.c
@@ -0,0 +1,618 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ * TEE->REE callee-side: handles interrupts from TEE, processes RPC requests.
+ */
+#include <linux/cpu.h>
+#include <linux/cpuhotplug.h>
+#include <linux/cpumask.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/ktime.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/tee_drv.h>
+#include <linux/workqueue.h>
+
+#include "mbedtee_drv.h"
+
+/*
+ * CPU hotplug state shared across all mbedtee instances (registered once).
+ */
+static int mbedtee_cpuhp_state = -EINVAL;
+static unsigned int mbedtee_cpuhp_instances;
+static DEFINE_MUTEX(mbedtee_cpuhp_mutex);
+/* rpc_routine() runs on workqueue, re-drains ring on completion */
+static void rpc_routine(struct work_struct *work);
+
+/*
+ * Common CPU-online handler: add the new CPU into the eligible T2R
+ * delivery set and let the transport re-apply affinity.
+ */
+static int mbedtee_cpu_online(unsigned int cpu, struct hlist_node *node)
+{
+ struct mbedtee_t2r_ctx *ctx =
+ hlist_entry(node, struct mbedtee_t2r_ctx, hp_node);
+ struct mbedtee_device *mbedtee =
+ container_of(ctx, struct mbedtee_device, t2r);
+ unsigned int target_cpu;
+
+ if (!ctx->t2r_ring || cpumask_test_cpu(cpu, &ctx->callee_cpus))
+ return 0;
+
+ cpumask_set_cpu(cpu, &ctx->callee_cpus);
+ target_cpu = cpumask_first(&ctx->callee_cpus);
+
+ if (mbedtee->rpc_ops && mbedtee->rpc_ops->update_affinity)
+ mbedtee->rpc_ops->update_affinity(mbedtee, target_cpu);
+
+ return 0;
+}
+
+/*
+ * Common CPU-offline handler: migrates T2R interrupt delivery to another
+ * online CPU when the current callee CPU is being taken offline.
+ *
+ * The transport-specific update_affinity() callback handles the actual
+ * interrupt migration (e.g. irq_set_affinity + callee_hartid update for
+ * RISC-V IMSIC; irq_set_affinity only for ARM - no ring update needed).
+ */
+static int mbedtee_cpu_offline(unsigned int cpu, struct hlist_node *node)
+{
+ struct mbedtee_t2r_ctx *ctx =
+ hlist_entry(node, struct mbedtee_t2r_ctx, hp_node);
+ struct mbedtee_device *mbedtee =
+ container_of(ctx, struct mbedtee_device, t2r);
+ unsigned int new_cpu;
+
+ if (!ctx->t2r_ring || !cpumask_test_cpu(cpu, &ctx->callee_cpus))
+ return 0;
+
+ /*
+ * Remove the dying CPU from the eligible set. If the set is now
+ * empty (all CPUs going away at once -- highly unlikely but safe),
+ * fall back to CPU 0 which Linux guarantees to be the last offline.
+ */
+ cpumask_clear_cpu(cpu, &ctx->callee_cpus);
+ if (cpumask_empty(&ctx->callee_cpus))
+ cpumask_set_cpu(0, &ctx->callee_cpus);
+
+ new_cpu = cpumask_first(&ctx->callee_cpus);
+
+ if (mbedtee->rpc_ops && mbedtee->rpc_ops->update_affinity)
+ mbedtee->rpc_ops->update_affinity(mbedtee, new_cpu);
+ return 0;
+}
+
+static inline size_t t2r_available_size(struct mbedtee_t2r_ctx *ctx)
+{
+ u32 wr;
+ u32 rd;
+ u32 shm_size = ctx->t2r_ring_sz;
+
+ /* Pair with producer release store after writing ring payload. */
+ wr = smp_load_acquire(&ctx->t2r_ring->wr);
+ rd = READ_ONCE(ctx->t2r_ring_rd);
+
+ if (wr > shm_size)
+ return 0;
+
+ if (wr >= rd)
+ return wr - rd;
+ return shm_size + wr - rd;
+}
+
+static void t2r_ring_copy(struct mbedtee_t2r_ctx *ctx,
+ void *data, size_t size, u32 rd)
+{
+ u32 remain;
+ u32 shm_size = ctx->t2r_ring_sz;
+ struct rpc_ringbuf *shm = ctx->t2r_ring;
+
+ if (rd + size <= shm_size) {
+ memcpy(data, &shm->mem[rd], size);
+ } else {
+ remain = rd + size - shm_size;
+ memcpy(data, &shm->mem[rd], size - remain);
+ memcpy((u8 *)data + size - remain,
+ &shm->mem[0], remain);
+ }
+}
+
+static void t2r_ring_advance(struct mbedtee_t2r_ctx *ctx, size_t size)
+{
+ u32 rd = READ_ONCE(ctx->t2r_ring_rd);
+ u32 shm_size = ctx->t2r_ring_sz;
+ struct rpc_ringbuf *shm = ctx->t2r_ring;
+
+ if (rd + size > shm_size)
+ rd = rd + size - shm_size;
+ else
+ rd += size;
+
+ WRITE_ONCE(ctx->t2r_ring_rd, rd);
+ /* Publish updated consumer index after command parsing is complete. */
+ smp_store_release(&shm->rd, rd);
+}
+
+/*
+ * Read and consume @size bytes from the TEE-to-REE ring buffer.
+ * Must be called with ctx->ring_lock held.
+ */
+static void t2r_ring_read(struct mbedtee_t2r_ctx *ctx,
+ void *data, size_t size)
+{
+ t2r_ring_copy(ctx, data, size, READ_ONCE(ctx->t2r_ring_rd));
+ t2r_ring_advance(ctx, size);
+}
+
+static bool rpc_queue_complete_only(struct mbedtee_t2r_ctx *ctx,
+ u64 waiter_id)
+{
+ if (ctx->complete_work_pending)
+ return false;
+
+ ctx->complete_work_pending = true;
+ ctx->complete_work.waiter_id = waiter_id;
+ queue_work(ctx->rpc_wq, &ctx->complete_work.work);
+
+ return true;
+}
+
+/*
+ * Try to pick the next RPC command from the ring buffer.
+ *
+ * For asynchronous RPCs the data payload follows the cmd header in the
+ * ring. If the payload has not fully arrived yet the cmd header is still
+ * consumed (it was already read) but the entry is marked incomplete so
+ * that the next IRQ resumes reading the payload instead of re-reading
+ * a header.
+ *
+ * For synchronous RPCs (waiter_id != 0) the work descriptor is allocated
+ * BEFORE the ring header is consumed. This guarantees that if the
+ * allocator returns NULL the ring entry is left intact so the IRQ
+ * handler will retry on the next wake-up rather than leaving a TEE
+ * thread blocked with no response.
+ *
+ * Returns a work descriptor on success, or NULL when no complete entry
+ * is available.
+ */
+static struct rpc_work *rpc_pick_next(struct mbedtee_device *mbedtee,
+ struct mbedtee_t2r_ctx *ctx, struct rpc_work *c)
+{
+ struct rpc_cmd cmd;
+ void (*func)(struct mbedtee_device *mbedtee, void *data, size_t size);
+ struct rpc_work *new_work = NULL;
+ resource_size_t off;
+ phys_addr_t shm_phys;
+ u64 shm_wire;
+
+ /* Resume reading payload of a previously incomplete async RPC */
+ if (ctx->pending_async) {
+ if (t2r_available_size(ctx) < ctx->pending_size)
+ return NULL;
+ ctx->pending_async = false;
+ t2r_ring_read(ctx, c->data, ctx->pending_size);
+ c->func = ctx->pending_func;
+ c->size = ctx->pending_size;
+ c->waiter_id = 0;
+ return c;
+ }
+
+ if (t2r_available_size(ctx) < sizeof(cmd))
+ return NULL;
+
+ /*
+ * Peek at the header without advancing the ring pointer.
+ * For sync RPCs we must pre-allocate before consuming the entry.
+ */
+ memset(&cmd, 0, sizeof(cmd));
+ t2r_ring_copy(ctx, &cmd, sizeof(cmd), READ_ONCE(ctx->t2r_ring_rd));
+
+ if (cmd.id >= MBEDTEE_RPC_MAX)
+ goto skip;
+
+ func = ctx->rpc_handlers[cmd.id];
+ if (!func)
+ goto skip;
+
+ if (cmd.waiter_id == 0) {
+ /* Async RPC: payload follows header in the ring */
+ if (cmd.size > sizeof(ctx->rpc_data))
+ goto skip;
+
+ /* Consume the header now that we know it is valid */
+ t2r_ring_advance(ctx, sizeof(cmd));
+
+ if (t2r_available_size(ctx) < cmd.size) {
+ /* Mark as incomplete, resume on next iteration */
+ ctx->pending_async = true;
+ ctx->pending_size = cmd.size;
+ ctx->pending_func = func;
+ return NULL;
+ }
+
+ t2r_ring_read(ctx, c->data, cmd.size);
+ } else {
+ /* Sync RPC: data lives in the shared memory region */
+ shm_wire = cmd.shm;
+ shm_phys = (phys_addr_t)shm_wire;
+ if ((u64)shm_phys != shm_wire)
+ goto skip;
+
+ if (shm_phys < ctx->t2r_shm_phys)
+ goto skip;
+
+ off = shm_phys - ctx->t2r_shm_phys;
+ if (cmd.size == 0 || cmd.size > ctx->t2r_shm_sz)
+ goto skip;
+
+ if (off > ctx->t2r_shm_sz - cmd.size)
+ goto skip;
+
+ new_work = kzalloc_obj(*new_work, GFP_ATOMIC);
+ if (!new_work)
+ return NULL;
+
+ t2r_ring_advance(ctx, sizeof(cmd));
+
+ c = new_work;
+ c->mbedtee = mbedtee;
+ c->data = ctx->t2r_shm + off;
+ }
+
+ c->func = func;
+ c->waiter_id = cmd.waiter_id;
+ c->size = cmd.size;
+
+ return c;
+
+skip:
+ /*
+ * If this was a sync RPC (waiter_id != 0) we must notify the TEE
+ * thread so it does not wait forever. Defer the completion fastcall
+ * to process context because transport implementations may sleep.
+ * If the single deferred-completion slot is already in use, leave the
+ * header in place and retry after the pending completion has drained.
+ */
+ if (cmd.waiter_id != 0 && !rpc_queue_complete_only(ctx, cmd.waiter_id))
+ return NULL;
+
+ /*
+ * Bad or unhandled entry: consume header plus any inline payload
+ * (async RPC payloads follow the header in the ring) to keep the
+ * ring moving. For sync RPCs payload is in t2r_shm, not the ring.
+ */
+ t2r_ring_advance(ctx, sizeof(cmd) + (cmd.waiter_id ? 0 : cmd.size));
+
+ return NULL;
+}
+
+static void rpc_drain_ring(struct mbedtee_device *mbedtee)
+{
+ struct mbedtee_t2r_ctx *ctx = &mbedtee->t2r;
+ struct rpc_work rw = {}, *c = NULL;
+ unsigned long flags;
+
+ if (!ctx->t2r_ring)
+ return;
+
+ spin_lock_irqsave(&ctx->ring_lock, flags);
+ while (READ_ONCE(ctx->t2r_ring_rd) !=
+ /* Pair with producer store-release after ring write. */
+ smp_load_acquire(&ctx->t2r_ring->wr)) {
+ rw.data = ctx->rpc_data;
+ c = rpc_pick_next(mbedtee, ctx, &rw);
+ if (!c)
+ break;
+
+ if (c->waiter_id == 0) {
+ c->func(mbedtee, c->data, c->size);
+ } else {
+ INIT_WORK(&c->work, rpc_routine);
+ queue_work(ctx->rpc_wq, &c->work);
+ }
+ }
+ spin_unlock_irqrestore(&ctx->ring_lock, flags);
+}
+
+static void rpc_routine(struct work_struct *work)
+{
+ struct rpc_work *c = container_of(work, struct rpc_work, work);
+ struct mbedtee_t2r_ctx *ctx = &c->mbedtee->t2r;
+ long ret;
+
+ if (!c->complete_only)
+ c->func(c->mbedtee, c->data, c->size);
+
+ /*
+ * COMPLETE_TEE must reach the TEE thread that issued the sync RPC.
+ * On RISC-V the notification uses a shared ring buffer that may be
+ * transiently full when many RPCs are in flight concurrently.
+ * Keep retrying rather than silently dropping the completion, which
+ * would leave the TEE thread blocked in rpc_call_sync forever.
+ * On ARM the fastcall is a direct SMC so -ENOSPC never occurs.
+ */
+ do {
+ ret = mbedtee_rpc_fastcall(c->mbedtee, MBEDTEE_RPC_COMPLETE_TEE,
+ (unsigned long)c->waiter_id, 0, 0);
+ if (ret != -ENOSPC && ret != -ENOMEM)
+ break;
+ cond_resched();
+ } while (1);
+
+ if (c != &ctx->complete_work) {
+ kfree(c);
+ return;
+ }
+
+ WRITE_ONCE(ctx->complete_work_pending, false);
+ rpc_drain_ring(c->mbedtee);
+}
+
+/*
+ * Hard IRQ handler -- drains the TEE-to-REE ring buffer.
+ *
+ * Asynchronous RPCs (waiter_id == 0) are handled inline since all async
+ * handlers (complete(), ktime_get_real_ts64()) are non-blocking.
+ *
+ * Synchronous RPCs (waiter_id != 0) may block waiting for the
+ * tee-supplicant, so they are dispatched to a workqueue.
+ */
+irqreturn_t mbedtee_rpc_irq_handler(int irq, void *dev_id)
+{
+ struct mbedtee_device *mbedtee = dev_id;
+
+ if (!mbedtee)
+ return IRQ_NONE;
+
+ rpc_drain_ring(mbedtee);
+
+ return IRQ_HANDLED;
+}
+
+static void mbedtee_rpc_complete(struct mbedtee_device *mbedtee,
+ void *data, size_t size)
+{
+ u64 waiter_id;
+
+ if (size < sizeof(waiter_id))
+ return;
+
+ memcpy(&waiter_id, data, sizeof(waiter_id));
+ if (!waiter_id)
+ return;
+
+ mbedtee_rpc_complete_call(mbedtee, waiter_id);
+}
+
+static void mbedtee_ree_time(struct mbedtee_device *mbedtee,
+ void *data, size_t size)
+{
+ struct timespec64 *ts = data;
+
+ if (size < sizeof(*ts))
+ return;
+
+ ktime_get_real_ts64(ts);
+}
+
+static void mbedtee_reefs_supp(struct mbedtee_device *mbedtee,
+ void *data, size_t size)
+{
+ mbedtee_supp_handler(mbedtee, MBEDTEE_SUPP_REEFS, data, size);
+}
+
+static void mbedtee_rpmb_supp(struct mbedtee_device *mbedtee,
+ void *data, size_t size)
+{
+ mbedtee_supp_handler(mbedtee, MBEDTEE_SUPP_RPMB, data, size);
+}
+
+static void mbedtee_register_rpc(struct mbedtee_device *mbedtee,
+ u32 id, void (*func)(struct mbedtee_device *mbedtee,
+ void *data, size_t size))
+{
+ struct mbedtee_t2r_ctx *ctx = &mbedtee->t2r;
+
+ if (WARN_ON(id >= MBEDTEE_RPC_MAX || !func))
+ return;
+
+ ctx->rpc_handlers[id] = func;
+}
+
+int mbedtee_rpc_init(struct mbedtee_device *mbedtee)
+{
+ struct mbedtee_t2r_ctx *ctx = &mbedtee->t2r;
+ struct device_node *node = mbedtee->dev->of_node;
+ struct resource res;
+ bool cpuhp_state_created = false;
+ int ret;
+
+ memset(ctx, 0, sizeof(*ctx));
+ spin_lock_init(&ctx->ring_lock);
+ mbedtee->rpc_ops = mbedtee_get_rpc_transport_ops();
+ if (!mbedtee->rpc_ops)
+ return -EIO;
+
+ ret = mbedtee_get_resource(node, "t2r-ring", &res);
+ if (ret) {
+ dev_err(mbedtee->dev, "t2r-ring not found in DT\n");
+ return ret;
+ }
+
+ ctx->t2r_ring = memremap(res.start, resource_size(&res),
+ MEMREMAP_WB);
+ if (!ctx->t2r_ring) {
+ dev_err(mbedtee->dev, "failed to map t2r ring\n");
+ return -ENOMEM;
+ }
+ if (resource_size(&res) <= sizeof(struct rpc_ringbuf)) {
+ dev_err(mbedtee->dev, "t2r-ring too small\n");
+ memunmap(ctx->t2r_ring);
+ ctx->t2r_ring = NULL;
+ return -EINVAL;
+ }
+ ctx->t2r_ring_sz = resource_size(&res) - sizeof(struct rpc_ringbuf);
+ /* Observe latest producer index only after ring metadata is visible. */
+ WRITE_ONCE(ctx->t2r_ring_rd, smp_load_acquire(&ctx->t2r_ring->rd));
+
+ dev_dbg(mbedtee->dev, "t2r-ring %pa\n", &res.start);
+
+ ret = mbedtee_get_resource(node, "t2r-shm", &res);
+ if (ret) {
+ dev_err(mbedtee->dev, "t2r-shm not found in DT\n");
+ goto err_ring;
+ }
+
+ ctx->t2r_shm_phys = res.start;
+ ctx->t2r_shm_sz = resource_size(&res);
+ ctx->t2r_shm = memremap(res.start, ctx->t2r_shm_sz,
+ MEMREMAP_WB);
+ if (!ctx->t2r_shm) {
+ dev_err(mbedtee->dev, "failed to map t2r shm\n");
+ ret = -ENOMEM;
+ goto err_ring;
+ }
+
+ dev_dbg(mbedtee->dev, "t2r-shm %pa\n", &res.start);
+
+ ctx->rpc_wq = alloc_workqueue("mbedtee-rpc", WQ_UNBOUND, 0);
+ if (!ctx->rpc_wq) {
+ dev_err(mbedtee->dev, "failed to create rpc workqueue\n");
+ ret = -ENOMEM;
+ goto err_shm;
+ }
+
+ ctx->complete_work.mbedtee = mbedtee;
+ ctx->complete_work.complete_only = true;
+ INIT_WORK(&ctx->complete_work.work, rpc_routine);
+
+ mbedtee_register_rpc(mbedtee, MBEDTEE_RPC_COMPLETE_REE, mbedtee_rpc_complete);
+ mbedtee_register_rpc(mbedtee, MBEDTEE_RPC_REETIME, mbedtee_ree_time);
+ mbedtee_register_rpc(mbedtee, MBEDTEE_RPC_REEFS, mbedtee_reefs_supp);
+ mbedtee_register_rpc(mbedtee, MBEDTEE_RPC_RPMB, mbedtee_rpmb_supp);
+
+ /*
+ * Register cpuhp instance BEFORE enabling interrupts so that
+ * T2R delivery migration is in place before the first IRQ fires.
+ */
+ mutex_lock(&mbedtee_cpuhp_mutex);
+ if (mbedtee_cpuhp_state < 0) {
+ mbedtee_cpuhp_state =
+ cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
+ "tee/mbedtee:rpc-callee",
+ mbedtee_cpu_online,
+ mbedtee_cpu_offline);
+ if (mbedtee_cpuhp_state < 0) {
+ ret = mbedtee_cpuhp_state;
+ mutex_unlock(&mbedtee_cpuhp_mutex);
+ goto err_wq;
+ }
+ cpuhp_state_created = true;
+ }
+
+ ret = cpuhp_state_add_instance(mbedtee_cpuhp_state, &ctx->hp_node);
+ if (!ret) {
+ mbedtee_cpuhp_instances++;
+ ctx->cpuhp_added = true;
+ } else if (cpuhp_state_created) {
+ cpuhp_remove_multi_state(mbedtee_cpuhp_state);
+ mbedtee_cpuhp_state = -EINVAL;
+ }
+ mutex_unlock(&mbedtee_cpuhp_mutex);
+ if (ret != 0)
+ goto err_wq;
+
+ ret = mbedtee->rpc_ops->init(mbedtee, ctx->t2r_ring,
+ mbedtee_rpc_irq_handler);
+ if (ret != 0)
+ goto err_cpuhp;
+
+ /* Signal the TEE that the REE callee is ready to receive. */
+ smp_store_release(&ctx->t2r_ring->callee_ready, true);
+
+ return 0;
+
+err_cpuhp:
+ mutex_lock(&mbedtee_cpuhp_mutex);
+ if (mbedtee_cpuhp_state >= 0 && ctx->cpuhp_added) {
+ cpuhp_state_remove_instance_nocalls(mbedtee_cpuhp_state,
+ &ctx->hp_node);
+ ctx->cpuhp_added = false;
+ if (mbedtee_cpuhp_instances)
+ mbedtee_cpuhp_instances--;
+ if (!mbedtee_cpuhp_instances) {
+ cpuhp_remove_multi_state(mbedtee_cpuhp_state);
+ mbedtee_cpuhp_state = -EINVAL;
+ }
+ }
+ mutex_unlock(&mbedtee_cpuhp_mutex);
+err_wq:
+ destroy_workqueue(ctx->rpc_wq);
+ ctx->rpc_wq = NULL;
+err_shm:
+ memunmap(ctx->t2r_shm);
+ ctx->t2r_shm = NULL;
+err_ring:
+ memunmap(ctx->t2r_ring);
+ ctx->t2r_ring = NULL;
+ return ret;
+}
+
+void mbedtee_rpc_uninit(struct mbedtee_device *mbedtee)
+{
+ struct mbedtee_t2r_ctx *ctx;
+
+ if (!mbedtee)
+ return;
+
+ ctx = &mbedtee->t2r;
+ /* Stop advertising the REE callee before interrupt teardown. */
+ if (ctx->t2r_ring)
+ WRITE_ONCE(ctx->t2r_ring->callee_ready, false);
+
+ mutex_lock(&mbedtee_cpuhp_mutex);
+ if (mbedtee_cpuhp_state >= 0 && ctx->cpuhp_added) {
+ cpuhp_state_remove_instance_nocalls(mbedtee_cpuhp_state,
+ &ctx->hp_node);
+ ctx->cpuhp_added = false;
+ if (mbedtee_cpuhp_instances)
+ mbedtee_cpuhp_instances--;
+ if (!mbedtee_cpuhp_instances) {
+ cpuhp_remove_multi_state(mbedtee_cpuhp_state);
+ mbedtee_cpuhp_state = -EINVAL;
+ }
+ }
+ mutex_unlock(&mbedtee_cpuhp_mutex);
+
+ if (mbedtee->rpc_ops)
+ mbedtee->rpc_ops->uninit(mbedtee);
+
+ /*
+ * Work queued before IRQ teardown may be blocked in the supplicant
+ * path. Abort those requests and reject later ones before draining the
+ * workqueue. R2T must stay alive until destroy_workqueue() returns
+ * because rpc_routine() sends COMPLETE_TEE replies over R2T.
+ */
+ mbedtee_supp_abort_all(&mbedtee->supp);
+
+ if (ctx->rpc_wq) {
+ destroy_workqueue(ctx->rpc_wq);
+ ctx->rpc_wq = NULL;
+ }
+
+ if (ctx->t2r_shm) {
+ memunmap(ctx->t2r_shm);
+ ctx->t2r_shm = NULL;
+ }
+
+ if (ctx->t2r_ring) {
+ memunmap(ctx->t2r_ring);
+ ctx->t2r_ring = NULL;
+ }
+}
diff --git a/drivers/tee/mbedtee/rpc_callee_arm.c b/drivers/tee/mbedtee/rpc_callee_arm.c
new file mode 100644
index 0000000..871bba5
--- /dev/null
+++ b/drivers/tee/mbedtee/rpc_callee_arm.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ * ARM/ARM64 GIC transport for the TEE->REE RPC callee.
+ *
+ * On ARM/ARM64 the TEE raises a rising-edge software-generated interrupt
+ * described by the "interrupts" property of the mbedtee DT node. This file
+ * obtains that virq via of_irq_get() and registers the hard IRQ handler
+ * supplied by the core callee layer.
+ */
+#include <linux/interrupt.h>
+#include <linux/cpu.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+
+#include "mbedtee_drv.h"
+
+static int arm_transport_init(struct mbedtee_device *mbedtee,
+ struct rpc_ringbuf *ring, irq_handler_t handler)
+{
+ struct mbedtee_t2r_ctx *ctx = &mbedtee->t2r;
+ struct mbedtee_rpc_transport_ctx *tctx = &mbedtee->transport;
+ int ret;
+
+ tctx->rpc_notify_virq = of_irq_get(mbedtee->dev->of_node, 0);
+ if (tctx->rpc_notify_virq <= 0)
+ return tctx->rpc_notify_virq ? tctx->rpc_notify_virq : -ENODEV;
+
+ ret = request_irq(tctx->rpc_notify_virq, handler,
+ 0, "mbedtee-rpc", mbedtee);
+ if (ret) {
+ dev_warn(mbedtee->dev, "request_irq %d failed: %d\n",
+ tctx->rpc_notify_virq, ret);
+ tctx->rpc_notify_virq = 0;
+ return ret;
+ }
+
+ /*
+ * Spread the T2R SPI across all online CPUs in Linux.
+ * The TEE needs no CPU information from Linux: it broadcasts
+ * via GIC hardware (GICv2 ITARGETS=0xFF / GICv3 IROUTER.IRM=1).
+ */
+ cpumask_copy(&ctx->callee_cpus, cpu_online_mask);
+ if (irq_set_affinity(tctx->rpc_notify_virq, &ctx->callee_cpus))
+ dev_warn(mbedtee->dev, "irq_set_affinity failed\n");
+
+ dev_dbg(mbedtee->dev, "t2r-irq %d\n", tctx->rpc_notify_virq);
+ return 0;
+}
+
+static void arm_transport_uninit(struct mbedtee_device *mbedtee)
+{
+ struct mbedtee_rpc_transport_ctx *tctx = &mbedtee->transport;
+
+ if (tctx->rpc_notify_virq > 0) {
+ free_irq(tctx->rpc_notify_virq, mbedtee);
+ tctx->rpc_notify_virq = 0;
+ }
+}
+
+/*
+ * ARM T2R uses a GIC SPI: the TEE broadcasts it via GIC hardware
+ * (GICv2 ITARGETS=0xFF or GICv3 IROUTER.IRM=1) to any alive CPU.
+ * TrustZone shares physical CPUs -- no ring update is ever needed.
+ *
+ * @new_cpu is ignored: the IRQ is re-affined to ctx->callee_cpus which
+ * the core callee layer keeps in sync (dying CPU already removed before
+ * this callback is invoked, so the mask is always accurate).
+ */
+static int arm_update_affinity(struct mbedtee_device *mbedtee,
+ unsigned int new_cpu)
+{
+ struct mbedtee_rpc_transport_ctx *tctx = &mbedtee->transport;
+
+ if (tctx->rpc_notify_virq > 0 &&
+ irq_set_affinity(tctx->rpc_notify_virq, &mbedtee->t2r.callee_cpus))
+ dev_warn(mbedtee->dev, "irq_set_affinity failed\n");
+
+ return 0;
+}
+
+static const struct rpc_transport_ops arm_transport_ops = {
+ .init = arm_transport_init,
+ .uninit = arm_transport_uninit,
+ .update_affinity = arm_update_affinity,
+};
+
+const struct rpc_transport_ops *mbedtee_get_rpc_transport_ops(void)
+{
+ return &arm_transport_ops;
+}
diff --git a/drivers/tee/mbedtee/rpc_callee_riscv.c b/drivers/tee/mbedtee/rpc_callee_riscv.c
new file mode 100644
index 0000000..7ac0f8e
--- /dev/null
+++ b/drivers/tee/mbedtee/rpc_callee_riscv.c
@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025 Xing Loong <xing.xl.loong at gmail.com>
+ * RISC-V MSI transport for the TEE->REE RPC callee.
+ *
+ * On RISC-V the TEE wakes the REE by writing a Message Signalled Interrupt
+ * into the target hart's IMSIC (Incoming MSI Controller). This file allocates
+ * one platform MSI from the DT-provided MSI parent and registers the hard IRQ
+ * handler supplied by the core callee layer.
+ *
+ * CPU hotplug: the common mbedtee_cpu_offline() callback in rpc_callee.c
+ * detects when the callee CPU goes offline and calls riscv_update_affinity()
+ * to migrate the MSI to another online CPU.
+ */
+#include <linux/interrupt.h>
+#include <linux/msi.h>
+#include <linux/of_irq.h>
+#include <linux/smp.h>
+
+#include "mbedtee_drv.h"
+
+static int mbedtee_ring_set_hartid(struct mbedtee_device *mbedtee,
+ struct rpc_ringbuf *ring,
+ unsigned int cpu)
+{
+ long hartid = cpuid_to_hartid_map(cpu);
+
+ if (hartid < 0) {
+ dev_err(mbedtee->dev, "CPU%u has no valid hart-id\n", cpu);
+ return -ERANGE;
+ }
+
+ WRITE_ONCE(ring->callee_hartid, (u32)hartid);
+ return 0;
+}
+
+static void mbedtee_rpc_write_msi_msg(struct msi_desc *desc_msi,
+ struct msi_msg *msg)
+{
+ struct mbedtee_device *mbedtee = dev_get_drvdata(desc_msi->dev);
+
+ if (mbedtee)
+ mbedtee->transport.rpc_msi_msg = *msg;
+}
+
+static int riscv_transport_init(struct mbedtee_device *mbedtee,
+ struct rpc_ringbuf *ring, irq_handler_t handler)
+{
+ struct mbedtee_t2r_ctx *ctx = &mbedtee->t2r;
+ const struct cpumask *eff;
+ struct mbedtee_rpc_transport_ctx *tctx = &mbedtee->transport;
+ unsigned int cpu;
+ struct device *dev = mbedtee->dev;
+ int virq;
+ int ret;
+
+ /*
+ * Set a bootstrap callee_hartid (hart 0) so the TEE can poll
+ * even if MSI setup fails below.
+ */
+ ret = mbedtee_ring_set_hartid(mbedtee, ring, 0);
+ if (ret)
+ return ret;
+
+ dev_set_drvdata(dev, mbedtee);
+
+ /*
+ * The MSI domain of an OF device is resolved only once, when the
+ * platform device is created (of_msi_configure() in of/platform.c).
+ * mbedtee's MSI parent is the IMSIC, whose MSI domain is created
+ * later, when the IMSIC builtin_platform_driver probes -- typically
+ * after this device has already been created with a NULL msi.domain.
+ *
+ * Deferred probing alone cannot recover from this: the driver core
+ * re-runs probe() but never re-runs of_msi_configure(), so the stale
+ * NULL domain would persist across every retry. Re-resolve it here
+ * and defer until the IMSIC driver is up. This mirrors the RISC-V
+ * APLIC/IOMMU platform-MSI drivers.
+ */
+ if (!dev_get_msi_domain(dev)) {
+ of_msi_configure(dev, dev->of_node);
+
+ if (!dev_get_msi_domain(dev))
+ return -EPROBE_DEFER;
+ }
+
+ ret = platform_device_msi_init_and_alloc_irqs(dev, 1,
+ mbedtee_rpc_write_msi_msg);
+ if (ret) {
+ dev_err(mbedtee->dev, "MSI alloc failed: %d\n", ret);
+ return ret;
+ }
+
+ virq = msi_get_virq(dev, 0);
+ if (virq <= 0) {
+ dev_err(mbedtee->dev, "no MSI virq\n");
+ ret = -ENOENT;
+ goto err_msi;
+ }
+
+ ret = request_irq(virq, handler, 0, "mbedtee-rpc", mbedtee);
+ if (ret) {
+ dev_err(mbedtee->dev, "request_irq %d failed: %d\n", virq, ret);
+ goto err_msi;
+ }
+
+ eff = irq_get_effective_affinity_mask(virq);
+ cpu = eff ? cpumask_first(eff) : 0;
+
+ dev_dbg(mbedtee->dev, "MSI addr 0x%x%08x data %d virq %d hart %ld\n",
+ tctx->rpc_msi_msg.address_hi, tctx->rpc_msi_msg.address_lo,
+ tctx->rpc_msi_msg.data, virq, cpuid_to_hartid_map(cpu));
+
+ /* Inform TEE of the IMSIC identity used for T2R notifications. */
+ ret = mbedtee_ring_set_hartid(mbedtee, ring, cpu);
+ if (ret)
+ goto err_irq;
+ /* Ensure callee_hartid is visible before advertising MSI interrupt ID. */
+ smp_store_release(&ring->callee_imsic_id, tctx->rpc_msi_msg.data);
+
+ /* Track the active callee CPU for hotplug migration. */
+ ctx->callee_virq = virq;
+ cpumask_set_cpu(cpu, &ctx->callee_cpus);
+
+ return 0;
+
+err_irq:
+ free_irq(virq, mbedtee);
+
+err_msi:
+ platform_device_msi_free_irqs_all(dev);
+ return ret;
+}
+
+static void riscv_transport_uninit(struct mbedtee_device *mbedtee)
+{
+ struct mbedtee_t2r_ctx *ctx = &mbedtee->t2r;
+ int virq;
+
+ virq = ctx->callee_virq;
+ ctx->callee_virq = 0;
+ if (virq > 0)
+ free_irq(virq, mbedtee);
+
+ platform_device_msi_free_irqs_all(mbedtee->dev);
+}
+
+/*
+ * Migrate the IMSIC MSI delivery to @new_cpu.
+ *
+ * Ordering guarantee for the TEE reader:
+ * 1. Clear callee_imsic_id to 0 -- TEE skips IMSIC path while we migrate.
+ * 2. Call irq_set_affinity() -- triggers mbedtee_rpc_write_msi_msg() which
+ * updates tctx->rpc_msi_msg with the new IMSIC identity.
+ * 3. Update callee_hartid (WRITE_ONCE inside mbedtee_ring_set_hartid());
+ * no explicit barrier needed here since the release store on
+ * callee_imsic_id in step 4 provides the ordering.
+ * 4. Publish new callee_imsic_id with smp_store_release -- TEE's
+ * smp_load_acquire on callee_imsic_id pairs with this store.
+ */
+static int riscv_update_affinity(struct mbedtee_device *mbedtee,
+ unsigned int new_cpu)
+{
+ struct mbedtee_t2r_ctx *ctx = &mbedtee->t2r;
+ struct mbedtee_rpc_transport_ctx *tctx = &mbedtee->transport;
+ struct rpc_ringbuf *ring = ctx->t2r_ring;
+ int virq = ctx->callee_virq;
+
+ if (!virq)
+ return -ENODEV;
+
+ /* Step 1: prevent TEE from using the stale IMSIC identity. */
+ smp_store_release(&ring->callee_imsic_id, 0);
+
+ /* Step 2: retarget the MSI; write_msi_msg callback updates rpc_msi_msg. */
+ if (irq_set_affinity(virq, cpumask_of(new_cpu))) {
+ dev_warn(mbedtee->dev, "irq_set_affinity to CPU%u failed\n",
+ new_cpu);
+ return -EIO;
+ }
+
+ /* Step 3: update callee_hartid. */
+ if (mbedtee_ring_set_hartid(mbedtee, ring, new_cpu))
+ return -ERANGE;
+
+ /* Step 4: publish new IMSIC id with release barrier. */
+ smp_store_release(&ring->callee_imsic_id, tctx->rpc_msi_msg.data);
+
+ dev_dbg(mbedtee->dev, "T2R callee migrated to CPU%u (hart %ld)\n",
+ new_cpu, cpuid_to_hartid_map(new_cpu));
+ return 0;
+}
+
+static const struct rpc_transport_ops riscv_transport_ops = {
+ .init = riscv_transport_init,
+ .uninit = riscv_transport_uninit,
+ .update_affinity = riscv_update_affinity,
+};
+
+const struct rpc_transport_ops *mbedtee_get_rpc_transport_ops(void)
+{
+ return &riscv_transport_ops;
+}
diff --git a/drivers/tee/mbedtee/rpc_caller.c b/drivers/tee/mbedtee/rpc_caller.c
new file mode 100644
index 0000000..1ae55db
--- /dev/null
+++ b/drivers/tee/mbedtee/rpc_caller.c
@@ -0,0 +1,532 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ * REE->TEE session management and yield-call interface.
+ */
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include "mbedtee_drv.h"
+
+#define MBEDTEE_RPC_CALL_ACTIVE 0
+#define MBEDTEE_RPC_CALL_DONE 1
+#define MBEDTEE_RPC_CALL_INTERRUPTED 2
+
+int mbedtee_rpc_call_alloc(struct mbedtee_device *mbedtee,
+ size_t payload_size, struct mbedtee_rpc_call **call)
+{
+ struct mbedtee_rpc_call *rcall;
+ unsigned long rpc_index;
+ int ret;
+
+ if (sizeof(*rcall) + payload_size > PAGE_SIZE)
+ return -E2BIG;
+
+ rcall = kzalloc(sizeof(*rcall) + payload_size, GFP_KERNEL);
+ if (!rcall)
+ return -ENOMEM;
+
+ init_completion(&rcall->c);
+ rcall->state = MBEDTEE_RPC_CALL_ACTIVE;
+ rcall->rpc.size = payload_size;
+ rcall->rpc.ret = -EOPNOTSUPP;
+ rcall->rpc_phys = mbedtee_virt_to_phys(&rcall->rpc);
+
+ do {
+ rpc_index = atomic_long_inc_return(&mbedtee->rpc_call_seq);
+ } while (rpc_index == 0);
+
+ ret = xa_insert_irq(&mbedtee->rpc_calls, rpc_index, rcall, GFP_KERNEL);
+ if (ret != 0) {
+ kfree(rcall);
+ return ret;
+ }
+
+ rcall->rpc.waiter_id = rpc_index;
+ *call = rcall;
+
+ return 0;
+}
+
+void mbedtee_rpc_call_free(struct mbedtee_device *mbedtee,
+ struct mbedtee_rpc_call *call)
+{
+ unsigned long rpc_index;
+
+ if (!call)
+ return;
+
+ rpc_index = (unsigned long)call->rpc.waiter_id;
+
+ /*
+ * If interrupted/completed, complete_call owns this allocation
+ * and will xa_erase + kfree when the TEE eventually finishes.
+ */
+ if (READ_ONCE(call->state) == MBEDTEE_RPC_CALL_INTERRUPTED)
+ return;
+
+ xa_erase_irq(&mbedtee->rpc_calls, rpc_index);
+ kfree(call);
+}
+
+void mbedtee_rpc_complete_call(struct mbedtee_device *mbedtee,
+ u64 waiter_id)
+{
+ struct mbedtee_rpc_call *call;
+ unsigned long rpc_index;
+ unsigned long flags;
+ unsigned int state;
+
+ rpc_index = (unsigned long)waiter_id;
+ if ((u64)rpc_index != waiter_id)
+ return;
+
+ xa_lock_irqsave(&mbedtee->rpc_calls, flags);
+ call = xa_load(&mbedtee->rpc_calls, rpc_index);
+ if (!call) {
+ xa_unlock_irqrestore(&mbedtee->rpc_calls, flags);
+ return;
+ }
+
+ state = cmpxchg(&call->state, MBEDTEE_RPC_CALL_ACTIVE,
+ MBEDTEE_RPC_CALL_DONE);
+ __xa_erase(&mbedtee->rpc_calls, rpc_index);
+
+ if (state == MBEDTEE_RPC_CALL_INTERRUPTED) {
+ xa_unlock_irqrestore(&mbedtee->rpc_calls, flags);
+ kfree(call);
+ return;
+ }
+
+ complete(&call->c);
+ xa_unlock_irqrestore(&mbedtee->rpc_calls, flags);
+}
+
+long mbedtee_rpc_wait_for_completion(struct mbedtee_device *mbedtee,
+ struct mbedtee_rpc_call *call, bool killable)
+{
+ long ret;
+ unsigned int state;
+ unsigned long flags;
+ unsigned long rpc_index;
+
+ if (!killable) {
+ wait_for_completion(&call->c);
+ return 0;
+ }
+
+ rpc_index = (unsigned long)call->rpc.waiter_id;
+
+ ret = wait_for_completion_killable(&call->c);
+ if (ret == 0)
+ return 0;
+
+ /*
+ * Synchronize with mbedtee_rpc_complete_call() via the
+ * xa_lock. If complete_call already consumed this entry
+ * before we acquired the lock, the entry is already gone
+ * from the xarray and the TEE already completed (or freed)
+ * the call -- treat as success since the RPC is finished.
+ * If the entry is still present, we hold the lock so
+ * complete_call cannot race with our state transition.
+ */
+ xa_lock_irqsave(&mbedtee->rpc_calls, flags);
+ if (xa_load(&mbedtee->rpc_calls, rpc_index) != call) {
+ xa_unlock_irqrestore(&mbedtee->rpc_calls, flags);
+ return 0;
+ }
+
+ state = cmpxchg(&call->state, MBEDTEE_RPC_CALL_ACTIVE,
+ MBEDTEE_RPC_CALL_INTERRUPTED);
+ if (state == MBEDTEE_RPC_CALL_DONE) {
+ xa_unlock_irqrestore(&mbedtee->rpc_calls, flags);
+ return 0;
+ }
+
+ if (state == MBEDTEE_RPC_CALL_ACTIVE)
+ /* Publish interruption state before the TEE waiter reads it. */
+ smp_store_release(&call->rpc.interrupted, true);
+
+ xa_unlock_irqrestore(&mbedtee->rpc_calls, flags);
+ return ret;
+}
+
+/* Local helpers for encoding/decoding the 4-bit-per-parameter type field. */
+static inline u32 mbedtee_param_type_get(u32 types, unsigned int idx)
+{
+ return (types >> (idx * 4)) & 0xF;
+}
+
+static inline u32 mbedtee_param_type_set(u32 type, unsigned int idx)
+{
+ return (type & 0xF) << (idx * 4);
+}
+
+static int mbedtee_param_decode(struct tee_param *params,
+ size_t num_params, const struct rpc_param *rp)
+{
+ size_t n;
+
+ if (num_params > ARRAY_SIZE(rp->params))
+ return -EINVAL;
+
+ for (n = 0; n < num_params; n++) {
+ struct tee_param *p = params + n;
+ const union rpc_tee_param *rtp = rp->params + n;
+ u32 attr = mbedtee_param_type_get(rp->params_type, n);
+
+ switch (attr) {
+ case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
+ memset(&p->u, 0, sizeof(p->u));
+ break;
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
+ p->u.value.a = rtp->value.a;
+ p->u.value.b = rtp->value.b;
+ break;
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
+ p->u.memref.size = rtp->memref.size;
+ break;
+ default:
+ return -EINVAL;
+ }
+ p->attr = attr;
+ }
+ return 0;
+}
+
+static int mbedtee_param_encode(struct rpc_param *rp,
+ size_t num_params, const struct tee_param *params)
+{
+ size_t n;
+
+ if (num_params > ARRAY_SIZE(rp->params))
+ return -EINVAL;
+
+ rp->params_type = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
+
+ for (n = 0; n < num_params; n++) {
+ const struct tee_param *p = params + n;
+ union rpc_tee_param *rtp = rp->params + n;
+
+ rp->params_type |= mbedtee_param_type_set(p->attr, n);
+
+ switch (p->attr) {
+ case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
+ memset(rtp, 0, sizeof(*rtp));
+ break;
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
+ rtp->value.a = p->u.value.a;
+ rtp->value.b = p->u.value.b;
+ break;
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
+ case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
+ if (p->u.memref.shm)
+ rtp->memref.id = p->u.memref.shm->sec_world_id;
+ else
+ rtp->memref.id = 0; /* invalid-id @ mbedtee */
+ rtp->memref.size = p->u.memref.size;
+ rtp->memref.offset = p->u.memref.shm_offs;
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * cancel_req() and shm_{register,unregister} still return Linux errno to the
+ * kernel TEE core. Preserve any local transport failure in @ret; otherwise
+ * fold a non-success TEE-side GP status into the generic -EIO expected by
+ * these internal-only hooks.
+ */
+static int mbedtee_rpc_gp_ret_to_errno(int ret, s32 gp_ret)
+{
+ if (ret)
+ return ret;
+
+ return gp_ret == TEEC_SUCCESS ? 0 : -EIO;
+}
+
+static struct mbedtee_session *
+mbedtee_find_session_locked(struct mbedtee_context_data *ctxdata,
+ u32 session_id)
+{
+ struct mbedtee_session *sess;
+
+ list_for_each_entry(sess, &ctxdata->sess_list, list_node)
+ if (sess->session_id == session_id)
+ return sess;
+
+ return NULL;
+}
+
+int mbedtee_open_session(struct tee_context *ctx,
+ struct tee_ioctl_open_session_arg *arg,
+ struct tee_param *param)
+{
+ int ret;
+ u32 session_id = 0;
+ struct mbedtee_context_data *ctxdata = ctx->data;
+ struct mbedtee_device *mbedtee = tee_get_drvdata(ctx->teedev);
+ struct mbedtee_rpc_call *call;
+ struct rpc_param *rp;
+ struct mbedtee_session *sess;
+
+ sess = kzalloc_obj(*sess, GFP_KERNEL);
+ if (!sess)
+ return -ENOMEM;
+
+ ret = mbedtee_rpc_call_alloc(mbedtee, sizeof(*rp), &call);
+ if (ret != 0) {
+ kfree(sess);
+ return ret;
+ }
+
+ rp = (struct rpc_param *)call->rpc.data;
+
+ ret = mbedtee_param_encode(rp, arg->num_params, param);
+ if (ret) {
+ kfree(sess);
+ mbedtee_rpc_call_free(mbedtee, call);
+ return ret;
+ }
+
+ memcpy(rp->uuid, arg->uuid, sizeof(arg->uuid));
+ memcpy(rp->clnt_uuid, arg->clnt_uuid, sizeof(arg->clnt_uuid));
+ rp->ret_origin = TEEC_ORIGIN_COMMS;
+
+ ret = mbedtee_rpc_yieldcall(mbedtee, MBEDTEE_RPC_OPEN_SESSION, call, false);
+
+ dev_dbg(mbedtee->dev, "open session ret %d gp_ret %d\n", ret,
+ call->rpc.ret);
+
+ if (ret == 0 && call->rpc.ret == TEEC_SUCCESS) {
+ session_id = rp->session_id;
+ sess->session_id = session_id;
+ mutex_lock(&ctxdata->mutex);
+ list_add(&sess->list_node, &ctxdata->sess_list);
+ mutex_unlock(&ctxdata->mutex);
+ } else {
+ kfree(sess);
+ }
+
+ if (ret != 0) {
+ arg->ret = TEEC_ERROR_COMMUNICATION;
+ arg->ret_origin = TEEC_ORIGIN_COMMS;
+ } else if (mbedtee_param_decode(param, arg->num_params, rp)) {
+ arg->ret = TEEC_ERROR_COMMUNICATION;
+ arg->ret_origin = TEEC_ORIGIN_COMMS;
+ if (call->rpc.ret == TEEC_SUCCESS)
+ mbedtee_close_session(ctx, session_id);
+ } else {
+ arg->session = rp->session_id;
+ arg->ret = (u32)call->rpc.ret;
+ arg->ret_origin = rp->ret_origin;
+ }
+
+ mbedtee_rpc_call_free(mbedtee, call);
+ return 0;
+}
+
+int mbedtee_invoke_func(struct tee_context *ctx,
+ struct tee_ioctl_invoke_arg *arg,
+ struct tee_param *param)
+{
+ int ret;
+ struct mbedtee_context_data *ctxdata = ctx->data;
+ struct mbedtee_device *mbedtee = tee_get_drvdata(ctx->teedev);
+ struct mbedtee_rpc_call *call;
+ struct rpc_param *rp;
+ struct mbedtee_session *sess;
+
+ mutex_lock(&ctxdata->mutex);
+ sess = mbedtee_find_session_locked(ctxdata, arg->session);
+ mutex_unlock(&ctxdata->mutex);
+ if (!sess)
+ return -EINVAL;
+
+ ret = mbedtee_rpc_call_alloc(mbedtee, sizeof(*rp), &call);
+ if (ret != 0)
+ return ret;
+
+ rp = (struct rpc_param *)call->rpc.data;
+
+ rp->session_id = arg->session;
+ rp->cmd_id = arg->func;
+ rp->ret_origin = TEEC_ORIGIN_COMMS;
+
+ ret = mbedtee_param_encode(rp, arg->num_params, param);
+ if (ret) {
+ mbedtee_rpc_call_free(mbedtee, call);
+ return ret;
+ }
+
+ ret = mbedtee_rpc_yieldcall(mbedtee, MBEDTEE_RPC_INVOKE_SESSION, call, true);
+
+ dev_dbg(mbedtee->dev, "invoke session ret %d gp_ret %d\n", ret,
+ call->rpc.ret);
+
+ if (ret != 0) {
+ arg->ret = TEEC_ERROR_COMMUNICATION;
+ arg->ret_origin = TEEC_ORIGIN_COMMS;
+ } else if (mbedtee_param_decode(param, arg->num_params, rp)) {
+ arg->ret = TEEC_ERROR_COMMUNICATION;
+ arg->ret_origin = TEEC_ORIGIN_COMMS;
+ } else {
+ arg->ret = (u32)call->rpc.ret;
+ arg->ret_origin = rp->ret_origin;
+ }
+
+ mbedtee_rpc_call_free(mbedtee, call);
+ return 0;
+}
+
+int mbedtee_close_session(struct tee_context *ctx, u32 session)
+{
+ int ret;
+ struct mbedtee_context_data *ctxdata = ctx->data;
+ struct mbedtee_device *mbedtee = tee_get_drvdata(ctx->teedev);
+ struct mbedtee_rpc_call *call;
+ struct rpc_param *rp;
+ struct mbedtee_session *sess;
+
+ mutex_lock(&ctxdata->mutex);
+ sess = mbedtee_find_session_locked(ctxdata, session);
+ if (!sess) {
+ mutex_unlock(&ctxdata->mutex);
+ return -EINVAL;
+ }
+
+ list_del(&sess->list_node);
+ mutex_unlock(&ctxdata->mutex);
+ kfree(sess);
+
+ ret = mbedtee_rpc_call_alloc(mbedtee, sizeof(*rp), &call);
+ if (ret != 0)
+ return ret;
+
+ rp = (struct rpc_param *)call->rpc.data;
+ rp->session_id = session;
+
+ ret = mbedtee_rpc_yieldcall(mbedtee, MBEDTEE_RPC_CLOSE_SESSION, call, false);
+
+ mbedtee_rpc_call_free(mbedtee, call);
+
+ return ret;
+}
+
+int mbedtee_cancel_req(struct tee_context *ctx,
+ u32 cancel_id, u32 session)
+{
+ int ret;
+ struct mbedtee_context_data *ctxdata = ctx->data;
+ struct mbedtee_device *mbedtee = tee_get_drvdata(ctx->teedev);
+ struct mbedtee_rpc_call *call;
+ struct rpc_cancel_req *cancel;
+ struct mbedtee_session *sess;
+
+ mutex_lock(&ctxdata->mutex);
+ sess = mbedtee_find_session_locked(ctxdata, session);
+ mutex_unlock(&ctxdata->mutex);
+ if (!sess)
+ return -EINVAL;
+
+ ret = mbedtee_rpc_call_alloc(mbedtee, sizeof(*cancel), &call);
+ if (ret != 0)
+ return ret;
+
+ cancel = (struct rpc_cancel_req *)call->rpc.data;
+ cancel->session_id = session;
+ cancel->cancel_id = cancel_id;
+
+ ret = mbedtee_rpc_yieldcall(mbedtee, MBEDTEE_RPC_CANCEL, call, false);
+ ret = mbedtee_rpc_gp_ret_to_errno(ret, call->rpc.ret);
+
+ mbedtee_rpc_call_free(mbedtee, call);
+
+ return ret;
+}
+
+int mbedtee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
+ struct page **pages, size_t nr_pages, unsigned long start)
+{
+ int ret;
+ size_t i, j;
+ u64 *pagearray;
+ struct mbedtee_device *mbedtee = tee_get_drvdata(ctx->teedev);
+ struct mbedtee_rpc_call *call;
+ struct rpc_memref *memref;
+ /* Multiple: number of MBEDTEE_PAGE_SIZE pages per Linux page. */
+ const size_t multiple = PAGE_SIZE / MBEDTEE_PAGE_SIZE;
+
+ BUILD_BUG_ON(PAGE_SIZE < MBEDTEE_PAGE_SIZE);
+
+ ret = mbedtee_rpc_call_alloc(mbedtee, sizeof(*memref), &call);
+ if (ret != 0)
+ return ret;
+
+ memref = (struct rpc_memref *)call->rpc.data;
+
+ pagearray = kcalloc(nr_pages * multiple, sizeof(*pagearray), GFP_KERNEL);
+ if (!pagearray) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ for (i = 0; i < nr_pages; i++) {
+ for (j = 0; j < multiple; j++)
+ pagearray[i * multiple + j] = MBEDTEE_PAGE_SIZE * j +
+ page_to_phys(pages[i]);
+ }
+
+ memref->size = tee_shm_get_size(shm);
+ memref->offset = tee_shm_get_page_offset(shm);
+ memref->pages = mbedtee_virt_to_phys(pagearray);
+ memref->cnt = nr_pages * multiple;
+ ret = mbedtee_rpc_yieldcall(mbedtee, MBEDTEE_RPC_REGISTER_SHM, call, false);
+ ret = mbedtee_rpc_gp_ret_to_errno(ret, call->rpc.ret);
+
+ if (ret == 0)
+ shm->sec_world_id = memref->id;
+
+ kfree(pagearray);
+
+out:
+ mbedtee_rpc_call_free(mbedtee, call);
+ return ret;
+}
+
+int mbedtee_shm_unregister(struct tee_context *ctx,
+ struct tee_shm *shm)
+{
+ int ret;
+ struct mbedtee_device *mbedtee = tee_get_drvdata(ctx->teedev);
+ struct mbedtee_rpc_call *call;
+ struct rpc_memref *memref;
+
+ ret = mbedtee_rpc_call_alloc(mbedtee, sizeof(*memref), &call);
+ if (ret != 0)
+ return ret;
+
+ memref = (struct rpc_memref *)call->rpc.data;
+ memref->id = shm->sec_world_id;
+
+ ret = mbedtee_rpc_yieldcall(mbedtee, MBEDTEE_RPC_UNREGISTER_SHM, call, false);
+ ret = mbedtee_rpc_gp_ret_to_errno(ret, call->rpc.ret);
+
+ mbedtee_rpc_call_free(mbedtee, call);
+
+ return ret;
+}
diff --git a/drivers/tee/mbedtee/rpc_caller_arm.c b/drivers/tee/mbedtee/rpc_caller_arm.c
new file mode 100644
index 0000000..1dd665a
--- /dev/null
+++ b/drivers/tee/mbedtee/rpc_caller_arm.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ * ARM RPC calls to TEE - relies on SMC
+ *
+ * Uses arm_smccc_smc() with SMCCC-compatible calling convention:
+ * Fast call : r0/x0 = fn (bit 31 set), r1-r3/x1-x3 = args.
+ * Yield call : r0/x0 = fn (bit 31 clear), r1/x1 = phys(rpc_cmd).
+ *
+ * ARM fast calls are synchronous SMC instructions.
+ */
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/arm-smccc.h>
+#include "mbedtee_drv.h"
+
+long mbedtee_rpc_yieldcall(struct mbedtee_device *mbedtee,
+ unsigned long fn, struct mbedtee_rpc_call *call,
+ bool interruptible)
+{
+ long ret;
+ struct arm_smccc_res res;
+
+ if (MBEDTEE_RPC_IS_FASTCALL(fn))
+ return -EINVAL;
+
+ call->rpc.id = fn;
+
+ arm_smccc_smc(fn, call->rpc_phys,
+ 0, 0, 0, 0, 0, 0, &res);
+ ret = res.a0;
+ if (ret != 0)
+ return ret;
+
+ return mbedtee_rpc_wait_for_completion(mbedtee, call, interruptible);
+}
+
+long mbedtee_rpc_fastcall(struct mbedtee_device *mbedtee,
+ unsigned long fn, unsigned long a0,
+ unsigned long a1, unsigned long a2)
+{
+ struct arm_smccc_res res;
+
+ if (!MBEDTEE_RPC_IS_FASTCALL(fn))
+ return -EINVAL;
+
+ arm_smccc_smc(fn, a0, a1, a2, 0, 0, 0, 0, &res);
+
+ return (long)res.a0;
+}
+
+/*
+ * ARM uses direct SMC; no caller-side ring buffer initialisation needed.
+ */
+int mbedtee_r2t_init(struct mbedtee_device *mbedtee)
+{
+ return 0;
+}
+
+void mbedtee_r2t_uninit(struct mbedtee_device *mbedtee)
+{
+}
diff --git a/drivers/tee/mbedtee/rpc_caller_riscv.c b/drivers/tee/mbedtee/rpc_caller_riscv.c
new file mode 100644
index 0000000..387d9bb
--- /dev/null
+++ b/drivers/tee/mbedtee/rpc_caller_riscv.c
@@ -0,0 +1,192 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025 Xing Loong <xing.xl.loong at gmail.com>
+ * REE->TEE RPC calls for RISC-V (IMSIC)
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+#include <linux/sizes.h>
+
+#include "mbedtee_drv.h"
+
+static bool rpc_ring_enough(struct mbedtee_r2t_ctx *ctx, size_t size)
+{
+ u32 wr;
+ u32 rd;
+ u32 remain;
+
+ wr = READ_ONCE(ctx->ring_wr);
+ /* Pair with callee release store when publishing ring->rd */
+ rd = smp_load_acquire(&ctx->ring->rd);
+
+ if (rd > ctx->ring_sz || wr > ctx->ring_sz)
+ return false;
+
+ if (rd <= wr)
+ remain = ctx->ring_sz + rd - wr;
+ else
+ remain = rd - wr;
+
+ return remain > size;
+}
+
+static void rpc_ring_write(struct mbedtee_r2t_ctx *ctx,
+ void *data, size_t size)
+{
+ struct rpc_ringbuf *shm = ctx->ring;
+ u32 remain;
+ u32 wr = READ_ONCE(ctx->ring_wr);
+
+ if (wr + size > ctx->ring_sz) {
+ remain = wr + size - ctx->ring_sz;
+ memcpy(&shm->mem[wr], data, size - remain);
+ memcpy(&shm->mem[0], (char *)data + size - remain, remain);
+ wr = remain;
+ } else {
+ memcpy(&shm->mem[wr], data, size);
+ wr += size;
+ }
+
+ WRITE_ONCE(ctx->ring_wr, wr);
+ /* Publish writer index after payload bytes become visible. */
+ smp_store_release(&shm->wr, wr);
+}
+
+long mbedtee_rpc_yieldcall(struct mbedtee_device *mbedtee,
+ unsigned long fn, struct mbedtee_rpc_call *call,
+ bool interruptible)
+{
+ struct mbedtee_r2t_ctx *ctx = &mbedtee->r2t;
+ unsigned long flags;
+ u64 phys;
+
+ if (!ctx->ring)
+ return -ENXIO;
+
+ if (MBEDTEE_RPC_IS_FASTCALL(fn))
+ return -EINVAL;
+
+ call->rpc.id = fn;
+
+ spin_lock_irqsave(&ctx->lock, flags);
+ if (!rpc_ring_enough(ctx, sizeof(u64))) {
+ dev_err_ratelimited(mbedtee->dev, "rpc ring full\n");
+ spin_unlock_irqrestore(&ctx->lock, flags);
+ return -ENOSPC;
+ }
+
+ phys = call->rpc_phys;
+ rpc_ring_write(ctx, &phys, sizeof(phys));
+ spin_unlock_irqrestore(&ctx->lock, flags);
+
+ return mbedtee_rpc_wait_for_completion(mbedtee, call, interruptible);
+}
+
+long mbedtee_rpc_fastcall(struct mbedtee_device *mbedtee,
+ unsigned long fn, unsigned long a0,
+ unsigned long a1, unsigned long a2)
+{
+ struct mbedtee_r2t_ctx *ctx = &mbedtee->r2t;
+ struct mbedtee_rpc_call *call;
+ unsigned long flags;
+ u64 phys;
+ int ret;
+
+ if (!ctx->ring)
+ return -ENXIO;
+
+ if (!MBEDTEE_RPC_IS_FASTCALL(fn))
+ return -EINVAL;
+
+ ret = mbedtee_rpc_call_alloc(mbedtee, 3 * sizeof(u64), &call);
+ if (ret != 0)
+ return ret;
+
+ call->rpc.id = fn;
+ call->rpc.size = 3 * sizeof(u64);
+ call->rpc.data[0] = a0;
+ call->rpc.data[1] = a1;
+ call->rpc.data[2] = a2;
+
+ spin_lock_irqsave(&ctx->lock, flags);
+ if (!rpc_ring_enough(ctx, sizeof(u64))) {
+ dev_err_ratelimited(mbedtee->dev, "rpc ring full\n");
+ spin_unlock_irqrestore(&ctx->lock, flags);
+ mbedtee_rpc_call_free(mbedtee, call);
+ return -ENOSPC;
+ }
+
+ phys = call->rpc_phys;
+ rpc_ring_write(ctx, &phys, sizeof(phys));
+ spin_unlock_irqrestore(&ctx->lock, flags);
+
+ ret = mbedtee_rpc_wait_for_completion(mbedtee, call, true);
+ if (ret != 0) {
+ mbedtee_rpc_call_free(mbedtee, call);
+ return ret;
+ }
+
+ ret = call->rpc.ret;
+ mbedtee_rpc_call_free(mbedtee, call);
+
+ return ret;
+}
+
+int mbedtee_r2t_init(struct mbedtee_device *mbedtee)
+{
+ struct mbedtee_r2t_ctx *ctx = &mbedtee->r2t;
+ struct device_node *node = mbedtee->dev->of_node;
+ struct resource res;
+ int ret;
+
+ memset(ctx, 0, sizeof(*ctx));
+ spin_lock_init(&ctx->lock);
+
+ ret = mbedtee_get_resource(node, "r2t-ring", &res);
+ if (ret)
+ return ret;
+
+ if (resource_size(&res) <= sizeof(struct rpc_ringbuf)) {
+ dev_err(mbedtee->dev, "r2t-ring too small\n");
+ return -EINVAL;
+ }
+
+ ctx->ring = memremap(res.start, resource_size(&res),
+ MEMREMAP_WB);
+ if (!ctx->ring) {
+ dev_err(mbedtee->dev, "failed to map r2t ring at %pa\n",
+ &res.start);
+ return -ENOMEM;
+ }
+ ctx->ring_sz = resource_size(&res) - sizeof(struct rpc_ringbuf);
+ /* Read initial writer index with acquire for coherent ring bootstrap. */
+ WRITE_ONCE(ctx->ring_wr, smp_load_acquire(&ctx->ring->wr));
+
+ dev_dbg(mbedtee->dev, "r2t-ring %pa\n", &res.start);
+
+ return 0;
+}
+
+void mbedtee_r2t_uninit(struct mbedtee_device *mbedtee)
+{
+ struct mbedtee_r2t_ctx *ctx;
+
+ if (!mbedtee)
+ return;
+
+ ctx = &mbedtee->r2t;
+ if (ctx->ring) {
+ memunmap(ctx->ring);
+ ctx->ring = NULL;
+ ctx->ring_sz = 0;
+ ctx->ring_wr = 0;
+ }
+}
diff --git a/drivers/tee/mbedtee/shm_pool.c b/drivers/tee/mbedtee/shm_pool.c
new file mode 100644
index 0000000..708ab24
--- /dev/null
+++ b/drivers/tee/mbedtee/shm_pool.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2017, EPAM Systems
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ */
+#include <linux/device.h>
+#include <linux/genalloc.h>
+#include <linux/slab.h>
+
+#include "mbedtee_drv.h"
+
+static int pool_op_alloc(struct tee_shm_pool *pool,
+ struct tee_shm *shm, size_t size, size_t align)
+{
+ unsigned int order = get_order(size);
+ struct page *page;
+ int rc = 0;
+
+ page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
+ if (!page)
+ return -ENOMEM;
+
+ shm->kaddr = page_address(page);
+ shm->paddr = page_to_phys(page);
+ shm->size = PAGE_SIZE << order;
+
+ if (!(shm->flags & TEE_SHM_PRIV)) {
+ struct mbedtee_device *mbedtee = tee_get_drvdata(shm->ctx->teedev);
+
+ if (mbedtee->yield) {
+ unsigned int nr_pages = 1 << order;
+ unsigned int i;
+ struct page **pages;
+
+ pages = kmalloc_array(nr_pages, sizeof(*pages), GFP_KERNEL);
+ if (!pages) {
+ rc = -ENOMEM;
+ goto err_pages;
+ }
+
+ for (i = 0; i < nr_pages; i++)
+ pages[i] = page + i;
+
+ rc = mbedtee_shm_register(shm->ctx, shm, pages,
+ nr_pages,
+ (unsigned long)shm->kaddr);
+ kfree(pages);
+ if (rc)
+ goto err_pages;
+ }
+ }
+
+ return 0;
+
+err_pages:
+ free_pages((unsigned long)shm->kaddr, get_order(shm->size));
+ shm->kaddr = NULL;
+ return rc;
+}
+
+static void pool_op_free(struct tee_shm_pool *pool,
+ struct tee_shm *shm)
+{
+ if (!(shm->flags & TEE_SHM_PRIV)) {
+ struct mbedtee_device *mbedtee = tee_get_drvdata(shm->ctx->teedev);
+
+ if (mbedtee->yield && shm->sec_world_id)
+ mbedtee_shm_unregister(shm->ctx, shm);
+ }
+
+ free_pages((unsigned long)shm->kaddr, get_order(shm->size));
+ shm->kaddr = NULL;
+}
+
+static void pool_op_destroy_pool(struct tee_shm_pool *pool)
+{
+ kfree(pool);
+}
+
+static const struct tee_shm_pool_ops pool_ops = {
+ .alloc = pool_op_alloc,
+ .free = pool_op_free,
+ .destroy_pool = pool_op_destroy_pool,
+};
+
+/**
+ * mbedtee_shm_pool_alloc_pages() - create page-based allocator pool
+ *
+ * This pool is used when MbedTEE supports dynamic shared memory. Command
+ * buffers and similar structures are allocated from kernel's own memory.
+ *
+ * Return: pointer to a tee_shm_pool or ERR_PTR on failure
+ */
+struct tee_shm_pool *mbedtee_shm_pool_alloc_pages(void)
+{
+ struct tee_shm_pool *pool = kzalloc_obj(*pool, GFP_KERNEL);
+
+ if (!pool)
+ return ERR_PTR(-ENOMEM);
+
+ pool->ops = &pool_ops;
+
+ return pool;
+}
diff --git a/drivers/tee/mbedtee/shm_pool.h b/drivers/tee/mbedtee/shm_pool.h
new file mode 100644
index 0000000..4510676
--- /dev/null
+++ b/drivers/tee/mbedtee/shm_pool.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2016, EPAM Systems
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ */
+
+#ifndef SHM_POOL_H
+#define SHM_POOL_H
+
+#include <linux/tee_drv.h>
+
+struct tee_shm_pool *mbedtee_shm_pool_alloc_pages(void);
+
+#endif
diff --git a/drivers/tee/mbedtee/supp.c b/drivers/tee/mbedtee/supp.c
new file mode 100644
index 0000000..bc7de22
--- /dev/null
+++ b/drivers/tee/mbedtee/supp.c
@@ -0,0 +1,310 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2020 Xing Loong <xing.xl.loong at gmail.com>
+ */
+#include <linux/device.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+
+#include "mbedtee_drv.h"
+
+struct mbedtee_supp_req {
+ int ret;
+ u32 func;
+
+ struct list_head node;
+ struct task_struct *worker;
+ struct tee_context *ctx; /* owning supplicant context */
+
+ struct tee_shm *shm;
+ void *data;
+ size_t size;
+
+ struct completion c;
+};
+
+static int mbedtee_supp_check_recv_params(size_t num_params,
+ struct tee_param *params)
+{
+ if (num_params != 1)
+ return -EINVAL;
+
+ if (!tee_param_is_memref(params) || !params->u.memref.shm)
+ return -EINVAL;
+
+ return 0;
+}
+
+void mbedtee_supp_init(struct mbedtee_supp *supp)
+{
+ memset(supp, 0, sizeof(*supp));
+ mutex_init(&supp->mutex);
+ init_completion(&supp->reqs_c);
+ INIT_LIST_HEAD(&supp->reqs);
+ INIT_LIST_HEAD(&supp->active_reqs);
+}
+
+void mbedtee_supp_uninit(struct mbedtee_supp *supp)
+{
+ mutex_destroy(&supp->mutex);
+}
+
+static void mbedtee_supp_complete_req(struct mbedtee_supp_req *r)
+{
+ list_del_init(&r->node);
+ if (r->shm)
+ tee_shm_put(r->shm);
+ r->shm = NULL;
+ r->ret = TEEC_ERROR_COMMUNICATION;
+ complete(&r->c);
+}
+
+void mbedtee_supp_release(struct mbedtee_supp *supp, struct tee_context *ctx)
+{
+ struct mbedtee_supp_req *r, *n;
+
+ mutex_lock(&supp->mutex);
+
+ /*
+ * Cancel only requests owned by @ctx. Unclaimed requests and
+ * requests owned by other supplicant contexts are left alone.
+ */
+ list_for_each_entry_safe(r, n, &supp->reqs, node) {
+ if (r->ctx != ctx)
+ continue;
+ mbedtee_supp_complete_req(r);
+ }
+
+ list_for_each_entry_safe(r, n, &supp->active_reqs, node) {
+ if (r->ctx != ctx)
+ continue;
+ mbedtee_supp_complete_req(r);
+ }
+
+ if (supp->ctx == ctx)
+ supp->ctx = NULL;
+
+ mutex_unlock(&supp->mutex);
+}
+
+void mbedtee_supp_abort_all(struct mbedtee_supp *supp)
+{
+ struct mbedtee_supp_req *r, *n;
+
+ mutex_lock(&supp->mutex);
+ supp->shutting_down = true;
+
+ list_for_each_entry_safe(r, n, &supp->reqs, node)
+ mbedtee_supp_complete_req(r);
+
+ list_for_each_entry_safe(r, n, &supp->active_reqs, node)
+ mbedtee_supp_complete_req(r);
+
+ supp->ctx = NULL;
+
+ mutex_unlock(&supp->mutex);
+ complete_all(&supp->reqs_c);
+}
+
+static int supp_enqueue_req(struct mbedtee_supp *supp,
+ struct mbedtee_supp_req *req)
+{
+ int ret = 0;
+
+ mutex_lock(&supp->mutex);
+ if (supp->shutting_down)
+ ret = -ESHUTDOWN;
+ else
+ list_add_tail(&req->node, &supp->reqs);
+ mutex_unlock(&supp->mutex);
+
+ return ret;
+}
+
+/*
+ * Receive an RPC request from TEE and dispatch it to supplicant.
+ * Blocks until the supplicant sends back the result.
+ */
+void mbedtee_supp_handler(struct mbedtee_device *mbedtee,
+ u32 func, void *data, size_t size)
+{
+ struct mbedtee_supp *supp = &mbedtee->supp;
+ struct mbedtee_supp_req *req = kzalloc_obj(*req, GFP_KERNEL);
+ struct supp_cmd_hdr *cmd = data;
+ int ret;
+
+ if (!req) {
+ if (cmd && size >= sizeof(*cmd))
+ cmd->ret = TEEC_ERROR_OUT_OF_MEMORY;
+ return;
+ }
+
+ init_completion(&req->c);
+ req->func = func;
+ req->data = data;
+ req->size = size;
+
+ ret = supp_enqueue_req(supp, req);
+ if (ret != 0) {
+ if (cmd && size >= sizeof(*cmd))
+ cmd->ret = TEEC_ERROR_COMMUNICATION;
+ kfree(req);
+ return;
+ }
+
+ /* Wake up the supplicant daemon to handle this request. */
+ complete(&supp->reqs_c);
+
+ wait_for_completion(&req->c);
+
+ kfree(req);
+}
+
+static int supp_pop_req(struct mbedtee_supp *supp,
+ struct mbedtee_supp_req **req)
+{
+ struct mbedtee_supp_req *r = NULL;
+ int ret = 0;
+
+ mutex_lock(&supp->mutex);
+ if (supp->shutting_down) {
+ ret = -ESHUTDOWN;
+ goto out;
+ }
+
+ r = list_first_entry_or_null(&supp->reqs, struct mbedtee_supp_req, node);
+
+ if (r) {
+ list_del_init(&r->node);
+ r->worker = current;
+ list_add_tail(&r->node, &supp->active_reqs);
+ }
+
+out:
+ mutex_unlock(&supp->mutex);
+ *req = r;
+ return ret;
+}
+
+/*
+ * Called by supplicant to receive the next pending request.
+ */
+int mbedtee_supp_recv(struct tee_context *ctx,
+ u32 *func, u32 *num_params, struct tee_param *param)
+{
+ struct tee_device *teedev = ctx->teedev;
+ struct mbedtee_device *mbedtee = tee_get_drvdata(teedev);
+ struct mbedtee_supp *supp = &mbedtee->supp;
+ struct mbedtee_supp_req *req;
+ struct mbedtee_context_data *d = ctx->data;
+ struct tee_shm *shm = param->u.memref.shm;
+ int ret;
+
+ ret = mbedtee_supp_check_recv_params(*num_params, param);
+ if (ret != 0)
+ return ret;
+
+ shm = tee_shm_get_from_id(ctx, shm->id);
+ tee_shm_put(param->u.memref.shm);
+ if (IS_ERR(shm)) {
+ param->u.memref.shm = NULL;
+ return PTR_ERR(shm);
+ }
+ param->u.memref.shm = shm;
+
+ d->is_supp_ctx = true;
+
+ while (true) {
+ ret = supp_pop_req(supp, &req);
+ if (ret != 0)
+ goto err;
+ if (req)
+ break;
+
+ if (wait_for_completion_interruptible(&supp->reqs_c)) {
+ ret = -ERESTARTSYS;
+ goto err;
+ }
+ }
+
+ /* Record which supplicant context owns this request. */
+ req->ctx = ctx;
+
+ if (req->size > param->u.memref.size) {
+ /* Return the request to the queue so it isn't lost */
+ mutex_lock(&supp->mutex);
+ list_del(&req->node);
+ list_add(&req->node, &supp->reqs);
+ mutex_unlock(&supp->mutex);
+ ret = -EOVERFLOW;
+ goto err;
+ }
+
+ *func = req->func;
+ req->shm = shm;
+
+ memcpy(shm->kaddr, req->data, req->size);
+ param->u.memref.size = req->size;
+
+ return 0;
+
+err:
+ tee_shm_put(shm);
+ param->u.memref.shm = NULL;
+ return ret;
+}
+
+/*
+ * Called by supplicant to send back the result of a request.
+ */
+int mbedtee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
+ struct tee_param *param)
+{
+ struct tee_device *teedev = ctx->teedev;
+ struct mbedtee_device *mbedtee = tee_get_drvdata(teedev);
+ struct mbedtee_supp *supp = &mbedtee->supp;
+ struct mbedtee_supp_req *req;
+ struct mbedtee_supp_req *_req;
+
+ if (num_params != 1)
+ return -EINVAL;
+
+ if (!tee_param_is_memref(param))
+ return -EINVAL;
+
+ /*
+ * Find the active request belonging to this worker thread.
+ * Each worker is identified by its task_struct pointer, which
+ * was recorded when supp_pop_req() dispatched the request.
+ */
+ mutex_lock(&supp->mutex);
+ req = NULL;
+ list_for_each_entry(_req, &supp->active_reqs, node) {
+ if (_req->worker == current) {
+ req = _req;
+ list_del_init(&req->node);
+ break;
+ }
+ }
+ mutex_unlock(&supp->mutex);
+
+ if (!req)
+ return -ENOENT;
+
+ if (param->u.memref.size > req->size) {
+ req->ret = TEEC_ERROR_COMMUNICATION;
+ } else {
+ req->ret = ret;
+ memcpy(req->data, req->shm->kaddr, param->u.memref.size);
+ }
+ if (req->shm)
+ tee_shm_put(req->shm);
+ req->shm = NULL;
+
+ /* Wake up mbedtee_supp_handler(). */
+ complete(&req->c);
+
+ return 0;
+}
diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h
index 5203977..2d30296 100644
--- a/include/uapi/linux/tee.h
+++ b/include/uapi/linux/tee.h
@@ -60,6 +60,7 @@
#define TEE_IMPL_ID_AMDTEE 2
#define TEE_IMPL_ID_TSTEE 3
#define TEE_IMPL_ID_QTEE 4
+#define TEE_IMPL_ID_MBEDTEE 5
/*
* OP-TEE specific capabilities
--
2.43.0
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