Add a remoteproc TEE (Trusted Execution Environment) driver that will be
probed by the TEE bus. If the associated Trusted application is supported
on the secure part, this driver offers a client interface to load firmware
by the secure part.
This firmware could be authenticated by the secure trusted application.
A specificity of the implementation is that the firmware has to be
authenticated and optionally decrypted to access the resource table.
Consequently, the boot sequence is:
1) rproc_parse_fw --> rproc_tee_parse_fw
remoteproc TEE:
- Requests the TEE application to authenticate and load the firmware
in the remote processor memories.
- Requests the TEE application for the address of the resource table.
- Creates a copy of the resource table stored in rproc->cached_table.
2) rproc_load_segments --> rproc_tee_load_fw
remoteproc TEE:
- Requests the TEE application to load the firmware. Nothing is done
at the TEE application as the firmware is already loaded.
- In case of recovery, the TEE application has to reload the firmware.
3) rproc_tee_get_loaded_rsc_table
remoteproc TEE requests the TEE application for the address of the
resource table.
4) rproc_start --> rproc_tee_start
- Requests the TEE application to start the remote processor.
The shutdown sequence is:
5) rproc_stop --> rproc_tee_stop
- Requests the TEE application to stop the remote processor.
6) rproc_tee_release_fw
This function is used to request the TEE application to perform actions
to return to the initial state on stop or on error during the boot
sequence.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliq...@foss.st.com>
---
Updates vs previous version:
- fix typo: double spaces
---
drivers/remoteproc/Kconfig | 10 +
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/remoteproc_tee.c | 619 ++++++++++++++++++++++++++++
include/linux/remoteproc_tee.h | 90 ++++
4 files changed, 720 insertions(+)
create mode 100644 drivers/remoteproc/remoteproc_tee.c
create mode 100644 include/linux/remoteproc_tee.h
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 83962a114dc9..e39265d249d9 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -23,6 +23,16 @@ config REMOTEPROC_CDEV
It's safe to say N if you don't want to use this interface.
+config REMOTEPROC_TEE
+ bool "Remoteproc support by a TEE application"
+ depends on OPTEE
+ help
+ Support a remote processor that is managed by an application running
in a Trusted
+ Execution Environment (TEE). This application is responsible for
loading the remote
+ processor firmware image and managing its lifecycle.
+
+ It's safe to say N if the remote processor is not managed by a TEE.
+
config IMX_REMOTEPROC
tristate "i.MX remoteproc support"
depends on ARCH_MXC
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 1c7598b8475d..a1a5201982d4 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -11,6 +11,7 @@ remoteproc-y += remoteproc_sysfs.o
remoteproc-y += remoteproc_virtio.o
remoteproc-y += remoteproc_elf_loader.o
obj-$(CONFIG_REMOTEPROC_CDEV) += remoteproc_cdev.o
+obj-$(CONFIG_REMOTEPROC_TEE) += remoteproc_tee.o
obj-$(CONFIG_IMX_REMOTEPROC) += imx_rproc.o
obj-$(CONFIG_IMX_DSP_REMOTEPROC) += imx_dsp_rproc.o
obj-$(CONFIG_INGENIC_VPU_RPROC) += ingenic_rproc.o
diff --git a/drivers/remoteproc/remoteproc_tee.c
b/drivers/remoteproc/remoteproc_tee.c
new file mode 100644
index 000000000000..209c573a85d2
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_tee.c
@@ -0,0 +1,619 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) STMicroelectronics 2024
+ * Author: Arnaud Pouliquen <arnaud.pouliq...@foss.st.com>
+ */
+
+#include <linux/firmware.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+#include <linux/remoteproc_tee.h>
+#include <linux/slab.h>
+#include <linux/tee_drv.h>
+
+#define MAX_TEE_PARAM_ARRAY_MEMBER 4
+
+/*
+ * Authentication and load of the firmware image in the remote processor
memories by the TEE.
+ * After this step the firmware is loaded in destination memories, which can
then be locked to
+ * prevent access by Linux.
+ *
+ * [in] params[0].value.a: remote processor identifier
+ * [in] params[1].memref: buffer containing a temporary copy of
the signed image to load.
+ */
+#define TA_RPROC_FW_CMD_LOAD_FW 1
+
+/*
+ * Start the remote processor by the TEE
+ *
+ * [in] params[0].value.a: remote processor identifier
+ */
+#define TA_RPROC_FW_CMD_START 2
+
+/*
+ * Stop the remote processor by the TEE
+ *
+ * [in] params[0].value.a: remote processor identifier
+ */
+#define TA_RPROC_FW_CMD_STOP 3
+
+/*
+ * Return the address of the resource table, or 0 if not found.
+ *
+ * [in] params[0].value.a: remote processor identifier
+ * [out] params[1].value.a: 32bit LSB resource table memory address
+ * [out] params[1].value.b: 32bit MSB resource table memory address
+ * [out] params[2].value.a: 32bit LSB resource table memory size
+ * [out] params[2].value.b: 32bit MSB resource table memory size
+ */
+#define TA_RPROC_FW_CMD_GET_RSC_TABLE 4
+
+/*
+ * Release remote processor firmware images and associated resources.
+ * This command should be used in case an error occurs between the loading of
+ * the firmware images (TA_RPROC_CMD_LOAD_FW) and the starting of the remote
+ * processor (TA_RPROC_CMD_START_FW) or after stopping the remote processor
+ * to release associated resources (TA_RPROC_CMD_STOP_FW).
+ *
+ * [in] params[0].value.a: Unique 32-bit remote processor identifier
+ */
+#define TA_RPROC_CMD_RELEASE_FW 6
+
+struct rproc_tee_context {
+ struct list_head sessions;
+ struct tee_context *tee_ctx;
+ struct device *dev;
+};
+
+/**
+ * struct rproc_tee - TEE remoteproc structure
+ * @node: Reference in list
+ * @rproc: Remoteproc reference
+ * @rproc_id: Identifier of the target firmware
+ * @session_id: TEE session identifier
+ */
+struct rproc_tee {
+ struct list_head node;
+ struct rproc *rproc;
+ u32 rproc_id;
+ u32 session_id;
+};
+
+static struct rproc_tee_context rproc_tee_ctx;
+static DEFINE_SPINLOCK(ctx_lock);
+
+static struct rproc_tee *rproc_to_trproc(struct rproc *rproc)
+{
+ struct rproc_tee *trproc;
+
+ list_for_each_entry(trproc, &rproc_tee_ctx.sessions, node)
+ if (trproc->rproc == rproc)
+ return trproc;
+
+ return NULL;
+}
+
+static void rproc_tee_prepare_args(struct rproc_tee *trproc, int cmd,
+ struct tee_ioctl_invoke_arg *arg,
+ struct tee_param *param,
+ unsigned int num_params)
+{
+ memset(arg, 0, sizeof(*arg));
+ memset(param, 0, MAX_TEE_PARAM_ARRAY_MEMBER * sizeof(*param));
+
+ arg->func = cmd;
+ arg->session = trproc->session_id;
+ arg->num_params = num_params + 1;
+
+ param[0] = (struct tee_param) {
+ .attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
+ .u.value.a = trproc->rproc_id,
+ };
+}
+
+/**
+ * rproc_tee_release_fw - Release the firmware for a TEE-based remote processor
+ *
+ * This function invokes the TA_RPROC_CMD_RELEASE_FW TEE client function to
release the firmware.
+ * It should only be called when the remoteproc state is RPROC_OFFLINE or
RPROC_DETACHED.
+ * The function requests the TEE remoteproc application to release the
firmware loaded by
+ * rproc_tee_load_fw(). The request is ignored if the rproc state is
RPROC_DETACHED as the
+ * remote processor is still running.
+ *
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ */
+void rproc_tee_release_fw(struct rproc *rproc)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRAY_MEMBER];
+ struct rproc_tee *trproc = rproc_to_trproc(rproc);
+ struct tee_ioctl_invoke_arg arg;
+ int ret;
+
+ if (!rproc_tee_ctx.dev)
+ return;
+
+ if (!trproc)
+ return;
+
+ /*
+ * If the remote processor state is RPROC_DETACHED, just ignore the
+ * request, as the remote processor is still running.
+ */
+ if (rproc->state == RPROC_DETACHED)
+ return;
+
+ if (rproc->state != RPROC_OFFLINE) {
+ dev_err(rproc_tee_ctx.dev, "unexpected rproc state: %d\n",
rproc->state);
+ return;
+ }
+
+ rproc_tee_prepare_args(trproc, TA_RPROC_CMD_RELEASE_FW, &arg, param, 0);
+
+ ret = tee_client_invoke_func(rproc_tee_ctx.tee_ctx, &arg, param);
+ if (ret < 0 || arg.ret != 0) {
+ dev_err(rproc_tee_ctx.dev,
+ "TA_RPROC_CMD_RELEASE_FW invoke failed TEE err: %#x,
ret:%d\n",
+ arg.ret, ret);
+ ret = -EIO;
+ }
+}
+EXPORT_SYMBOL_GPL(rproc_tee_release_fw);
+
+/**
+ * rproc_tee_load_fw - Load firmware from TEE application
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ * @fw: Pointer to the firmware structure containing the firmware data and size
+ *
+ * This function invokes the TA_RPROC_FW_CMD_LOAD_FW TEE client function to
load the firmware.
+ * It registers the fw->data as a shared memory region with the TEE, and
request the TEE to load
+ * the firmware. This function can be called twice during the remote processor
boot, considering
+ * that the TEE application ignores the command if the firmware is already
loaded.
+ *
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ * @fw: Pointer to the firmware structure containing the firmware data and size
+ *
+ * Return: 0 on success, or an error code on failure
+ */
+int rproc_tee_load_fw(struct rproc *rproc, const struct firmware *fw)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRAY_MEMBER];
+ struct rproc_tee *trproc = rproc_to_trproc(rproc);
+ struct tee_ioctl_invoke_arg arg;
+ struct tee_shm *fw_shm;
+ int ret;
+
+ if (!rproc_tee_ctx.dev)
+ return -ENODEV;
+
+ if (!trproc)
+ return -EINVAL;
+
+ fw_shm = tee_shm_register_kernel_buf(rproc_tee_ctx.tee_ctx, (void
*)fw->data, fw->size);
+ if (IS_ERR(fw_shm))
+ return PTR_ERR(fw_shm);
+
+ rproc_tee_prepare_args(trproc, TA_RPROC_FW_CMD_LOAD_FW, &arg, param, 1);
+
+ /* Provide the address of the firmware image */
+ param[1] = (struct tee_param) {
+ .attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT,
+ .u.memref = {
+ .shm = fw_shm,
+ .size = fw->size,
+ .shm_offs = 0,
+ },
+ };
+
+ ret = tee_client_invoke_func(rproc_tee_ctx.tee_ctx, &arg, param);
+ if (ret < 0 || arg.ret != 0) {
+ dev_err(rproc_tee_ctx.dev,
+ "TA_RPROC_FW_CMD_LOAD_FW invoke failed TEE err: %#x,
ret:%d\n",
+ arg.ret, ret);
+ if (!ret)
+ ret = -EIO;
+ }
+
+ tee_shm_free(fw_shm);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rproc_tee_load_fw);
+
+static int rproc_tee_get_loaded_rsc_table(struct rproc *rproc, phys_addr_t
*rsc_pa,
+ size_t *table_sz)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRAY_MEMBER];
+ struct rproc_tee *trproc = rproc_to_trproc(rproc);
+ struct tee_ioctl_invoke_arg arg;
+ int ret;
+
+ if (!rproc_tee_ctx.dev)
+ return -ENODEV;
+
+ if (!trproc)
+ return -EINVAL;
+
+ rproc_tee_prepare_args(trproc, TA_RPROC_FW_CMD_GET_RSC_TABLE, &arg,
param, 2);
+
+ param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT;
+ param[2].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT;
+
+ ret = tee_client_invoke_func(rproc_tee_ctx.tee_ctx, &arg, param);
+ if (ret < 0 || arg.ret != 0) {
+ dev_err(rproc_tee_ctx.dev,
+ "TA_RPROC_FW_CMD_GET_RSC_TABLE invoke failed TEE err:
%#x, ret:%d\n",
+ arg.ret, ret);
+ return -EIO;
+ }
+
+ *table_sz = param[2].u.value.a;
+
+ if (*table_sz)
+ *rsc_pa = param[1].u.value.a;
+ else
+ *rsc_pa = 0;
+
+ return 0;
+}
+
+/**
+ * rproc_tee_parse_fw - Get the resource table from TEE application
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ * @fw: Pointer to the firmware structure containing the firmware data and size
+ *
+ * This function retrieves the loaded resource table and creates a
cached_table copy. Since the
+ * firmware image is signed and potentially encrypted, the firmware must be
loaded first to
+ * access the loaded resource table.
+ *
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ * @fw: Pointer to the firmware structure containing the firmware data and size
+ *
+ * Return: 0 on success, or an error code on failure
+ */
+int rproc_tee_parse_fw(struct rproc *rproc, const struct firmware *fw)
+{
+ phys_addr_t rsc_table;
+ void __iomem *rsc_va;
+ size_t table_sz;
+ int ret;
+
+ if (!rproc)
+ return -EINVAL;
+
+ /* We need first to Load the firmware, to be able to get the resource
table. */
+ ret = rproc_tee_load_fw(rproc, fw);
+ if (ret)
+ return ret;
+
+ ret = rproc_tee_get_loaded_rsc_table(rproc, &rsc_table, &table_sz);
+ if (ret)
+ goto release_fw;
+
+ /*
+ * We assume here that the memory mapping is the same between the TEE
and Linux kernel
+ * contexts. Else a new TEE remoteproc service could be needed to get a
copy of the
+ * resource table
+ */
+ rsc_va = ioremap_wc(rsc_table, table_sz);
+ if (!rsc_va) {
+ dev_err(rproc_tee_ctx.dev, "Unable to map memory region:
%pa+%zx\n",
+ &rsc_table, table_sz);
+ ret = -ENOMEM;
+ goto release_fw;
+ }
+
+ /*
+ * Create a copy of the resource table to have the same behavior as the
ELF loader.
+ * This cached table will be used by the remoteproc core after the
remoteproc stops
+ * to free resources and for crash recovery to reapply the settings.
+ * The cached table will be freed by the remoteproc core.
+ */
+ rproc->cached_table = kmemdup((__force void *)rsc_va, table_sz,
GFP_KERNEL);
+ iounmap(rsc_va);
+
+ if (!rproc->cached_table) {
+ ret = -ENOMEM;
+ goto release_fw;
+ }
+
+ rproc->table_ptr = rproc->cached_table;
+ rproc->table_sz = table_sz;
+
+ return 0;
+
+release_fw:
+ rproc_tee_release_fw(rproc);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rproc_tee_parse_fw);
+
+/**
+ * rproc_tee_find_loaded_rsc_table - Find the loaded resource table loaded by
the TEE application
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ * @fw: Pointer to the firmware structure containing the firmware data and size
+ *
+ * This function retrieves the physical address and size of the resource table
loaded by the TEE
+ * application.
+ *
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ * @fw: Pointer to the firmware structure containing the firmware data and size
+ *
+ * Return: pointer to the resource table if found, or NULL if not found or
size is 0
+ */
+struct resource_table *rproc_tee_find_loaded_rsc_table(struct rproc *rproc,
+ const struct firmware
*fw)
+{
+ phys_addr_t rsc_table;
+ size_t table_sz;
+ int ret;
+
+ ret = rproc_tee_get_loaded_rsc_table(rproc, &rsc_table, &table_sz);
+ if (ret)
+ return NULL;
+
+ rproc->table_sz = table_sz;
+ if (!table_sz)
+ return NULL;
+
+ /*
+ * At this step the memory area that contains the resource table should
have been registered
+ * by the remote proc platform driver and allocated by
rproc_alloc_registered_carveouts().
+ */
+ return (struct resource_table *)rproc_pa_to_va(rproc, rsc_table,
table_sz, NULL);
+}
+EXPORT_SYMBOL_GPL(rproc_tee_find_loaded_rsc_table);
+
+/**
+ * rproc_tee_start - Request the TEE application to start the remote processor
+ *
+ * This function invokes the TA_RPROC_FW_CMD_START command to start the remote
processor.
+ *
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ *
+ * Return: Returns 0 on success, -EINVAL or -EIO on failure
+ */
+int rproc_tee_start(struct rproc *rproc)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRAY_MEMBER];
+ struct rproc_tee *trproc = rproc_to_trproc(rproc);
+ struct tee_ioctl_invoke_arg arg;
+ int ret = 0;
+
+ if (!trproc)
+ return -EINVAL;
+
+ rproc_tee_prepare_args(trproc, TA_RPROC_FW_CMD_START, &arg, param, 0);
+
+ ret = tee_client_invoke_func(rproc_tee_ctx.tee_ctx, &arg, param);
+ if (ret < 0 || arg.ret != 0) {
+ dev_err(rproc_tee_ctx.dev,
+ "TA_RPROC_FW_CMD_START invoke failed TEE err: %#x,
ret:%d\n", arg.ret, ret);
+ if (!ret)
+ return -EIO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rproc_tee_start);
+
+/**
+ * rproc_tee_stop - Request the TEE application to start the remote processor
+ *
+ * This function invokes the TA_RPROC_FW_CMD_STOP command to stop the remote
processor.
+ *
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ *
+ * Return: Returns 0 on success, -EINVAL or -EIO on failure
+ */
+int rproc_tee_stop(struct rproc *rproc)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRAY_MEMBER];
+ struct rproc_tee *trproc = rproc_to_trproc(rproc);
+ struct tee_ioctl_invoke_arg arg;
+ int ret;
+
+ if (!trproc)
+ return -EINVAL;
+
+ rproc_tee_prepare_args(trproc, TA_RPROC_FW_CMD_STOP, &arg, param, 0);
+
+ ret = tee_client_invoke_func(rproc_tee_ctx.tee_ctx, &arg, param);
+ if (ret < 0 || arg.ret != 0) {
+ dev_err(rproc_tee_ctx.dev,
+ "TA_RPROC_FW_CMD_STOP invoke failed TEE err: %#x,
ret:%d\n", arg.ret, ret);
+ if (!ret)
+ ret = -EIO;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rproc_tee_stop);
+
+static const struct tee_client_device_id rproc_tee_id_table[] = {
+ {UUID_INIT(0x80a4c275, 0x0a47, 0x4905, 0x82, 0x85, 0x14, 0x86, 0xa9,
0x77, 0x1a, 0x08)},
+ {}
+};
+
+/**
+ * rproc_tee_register - Register a remote processor controlled by a TEE
application.
+ *
+ * This function registers a remote processor that will be managed by a TEE
application,by opening
+ * a session with the TEE client.
+ *
+ * @dev: Pointer to client rproc device
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ * @rproc_id: ID of the remote processor
+ *
+ * Return: Returns 0 on success, or an error code on failure
+ */
+int rproc_tee_register(struct device *dev, struct rproc *rproc, unsigned int
rproc_id)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRAY_MEMBER];
+ struct tee_ioctl_open_session_arg sess_arg;
+ struct tee_client_device *tee_device;
+ struct rproc_tee *trproc;
+ struct device_link *link;
+ int ret;
+
+ spin_lock(&ctx_lock);
+ /*
+ * Test if the device has been probed by the TEE bus. In case of
failure, we ignore the
+ * reason. The bus could be not yet probed or the service not available
in the secure
+ * firmware.The assumption in such a case is that the TEE remoteproc is
not probed.
+ */
+ if (!rproc_tee_ctx.dev) {
+ ret = -EPROBE_DEFER;
+ goto out;
+ }
+
+ trproc = kzalloc(sizeof(*trproc), GFP_KERNEL);
+ if (!trproc) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ tee_device = to_tee_client_device(rproc_tee_ctx.dev);
+ memset(&sess_arg, 0, sizeof(sess_arg));
+
+ memcpy(sess_arg.uuid, tee_device->id.uuid.b, TEE_IOCTL_UUID_LEN);
+
+ sess_arg.clnt_login = TEE_IOCTL_LOGIN_REE_KERNEL;
+ sess_arg.num_params = 1;
+
+ param[0] = (struct tee_param) {
+ .attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
+ .u.value.a = rproc_id,
+ };
+
+ ret = tee_client_open_session(rproc_tee_ctx.tee_ctx, &sess_arg, param);
+ if (ret < 0 || sess_arg.ret != 0) {
+ dev_err(dev, "tee_client_open_session failed, err: %#x\n",
sess_arg.ret);
+ ret = -EINVAL;
+ goto free_tproc;
+ }
+
+ trproc->rproc_id = rproc_id;
+ trproc->session_id = sess_arg.session;
+
+ trproc->rproc = rproc;
+
+ /* Create device link between the rproc device and the TEE device */
+ link = device_link_add(dev, rproc_tee_ctx.dev,
DL_FLAG_AUTOREMOVE_CONSUMER);
+ if (!link) {
+ ret = -ENOMEM;
+ goto close_tee;
+ }
+ list_add_tail(&trproc->node, &rproc_tee_ctx.sessions);
+
+ goto out;
+
+close_tee:
+ if (tee_client_close_session(rproc_tee_ctx.tee_ctx, trproc->session_id))
+ dev_err(rproc_tee_ctx.dev, "tee_client_close_session failed\n");
+free_tproc:
+ kfree(trproc);
+out:
+ spin_unlock(&ctx_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rproc_tee_register);
+
+/**
+ * rproc_tee_unregister - Register a remote processor controlled by a TEE
application.
+ *
+ * This function unregisters a remote processor previously registered by the
rproc_tee_register()
+ * function.
+ *
+ * @dev: Pointer to client rproc device
+ * @rproc: Pointer to the struct rproc representing the remote processor
+ *
+ * Return: Returns 0 on success, or an error code on failure
+ */
+int rproc_tee_unregister(struct device *dev, struct rproc *rproc)
+{
+ struct rproc_tee *trproc = rproc_to_trproc(rproc);
+ int ret;
+
+ if (!trproc)
+ return -EINVAL;
+
+ spin_lock(&ctx_lock);
+
+ ret = tee_client_close_session(rproc_tee_ctx.tee_ctx,
trproc->session_id);
+ if (ret < 0)
+ dev_err(rproc_tee_ctx.dev, "tee_client_close_session failed,
err: %#x\n", ret);
+
+ spin_unlock(&ctx_lock);
+
+ list_del(&trproc->node);
+ kfree(trproc);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rproc_tee_unregister);
+
+static int rproc_tee_ctx_match(struct tee_ioctl_version_data *ver, const void
*data)
+{
+ /* Today we support only the OP-TEE, could be extend to other tees */
+ return (ver->impl_id == TEE_IMPL_ID_OPTEE);
+}
+
+static int rproc_tee_probe(struct device *dev)
+{
+ struct tee_context *tee_ctx;
+
+ /* Open context with TEE driver */
+ tee_ctx = tee_client_open_context(NULL, rproc_tee_ctx_match, NULL,
NULL);
+ if (IS_ERR(tee_ctx))
+ return PTR_ERR(tee_ctx);
+
+ spin_lock(&ctx_lock);
+ rproc_tee_ctx.dev = dev;
+ rproc_tee_ctx.tee_ctx = tee_ctx;
+ INIT_LIST_HEAD(&rproc_tee_ctx.sessions);
+ spin_unlock(&ctx_lock);
+
+ return 0;
+}
+
+static int rproc_tee_remove(struct device *dev)
+{
+ spin_lock(&ctx_lock);
+ tee_client_close_context(rproc_tee_ctx.tee_ctx);
+ rproc_tee_ctx.dev = NULL;
+ rproc_tee_ctx.tee_ctx = NULL;
+ spin_unlock(&ctx_lock);
+
+ return 0;
+}
+
+MODULE_DEVICE_TABLE(tee, rproc_tee_id_table);
+
+static struct tee_client_driver rproc_tee_fw_driver = {
+ .id_table = rproc_tee_id_table,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .bus = &tee_bus_type,
+ .probe = rproc_tee_probe,
+ .remove = rproc_tee_remove,
+ },
+};
+
+static int __init rproc_tee_fw_mod_init(void)
+{
+ return driver_register(&rproc_tee_fw_driver.driver);
+}
+
+static void __exit rproc_tee_fw_mod_exit(void)
+{
+ driver_unregister(&rproc_tee_fw_driver.driver);
+}
+
+module_init(rproc_tee_fw_mod_init);
+module_exit(rproc_tee_fw_mod_exit);
+
+MODULE_DESCRIPTION(" remote processor TEE module");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/remoteproc_tee.h b/include/linux/remoteproc_tee.h
new file mode 100644
index 000000000000..659bd77a4f12
--- /dev/null
+++ b/include/linux/remoteproc_tee.h
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2024 STMicroelectronics
+ */
+
+#ifndef REMOTEPROC_TEE_H
+#define REMOTEPROC_TEE_H
+
+#include <linux/tee_drv.h>
+#include <linux/firmware.h>
+#include <linux/remoteproc.h>
+
+struct rproc;
+struct rproc_tee;
+
+#if IS_ENABLED(CONFIG_REMOTEPROC_TEE)
+
+int rproc_tee_register(struct device *dev, struct rproc *rproc, unsigned int
rproc_id);
+int rproc_tee_unregister(struct device *dev, struct rproc *rproc);
+int rproc_tee_parse_fw(struct rproc *rproc, const struct firmware *fw);
+int rproc_tee_load_fw(struct rproc *rproc, const struct firmware *fw);
+void rproc_tee_release_fw(struct rproc *rproc);
+struct resource_table *rproc_tee_find_loaded_rsc_table(struct rproc *rproc,
+ const struct firmware
*fw);
+int rproc_tee_start(struct rproc *rproc);
+int rproc_tee_stop(struct rproc *rproc);
+
+#else
+
+static inline int rproc_tee_register(struct device *dev, struct rproc *rproc,
unsigned int rproc_id)
+{
+ return -ENODEV;
+}
+
+static inline int rproc_tee_parse_fw(struct rproc *rproc, const struct
firmware *fw)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline int rproc_tee_unregister(struct device *dev, struct rproc *rproc)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline int rproc_tee_load_fw(struct rproc *rproc, const struct
firmware *fw)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline int rproc_tee_start(struct rproc *rproc)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline int rproc_tee_stop(struct rproc *rproc)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline void rproc_tee_release_fw(struct rproc *rproc)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+}
+
+static inline struct resource_table *
+rproc_tee_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return NULL;
+}
+#endif /* CONFIG_REMOTEPROC_TEE */
+#endif /* REMOTEPROC_TEE_H */
--
2.25.1
