Main updates from the previous version [1][2]:
------------------------------------------
1) Rework resource table management
- Rework tee_rproc_parse_fw to temporary map the resource table address
to create a cached_table (similar to what is done in
rproc_elf_load_rsc_table()).
- Rename tee_rproc_get_loaded_rsc_table to tee_rproc_find_loaded_rsc_table
- Introduce rproc_pa_to_va() allowing to translate the resource table
physical address to virtual address based on remoteproc carveouts.
2) Merge the 2 "st,stm32-rproc.yaml" bindings patch in one
As the st,rproc-id" is linked to the introduction of the
"st,stm32mp1-m4-tee" compatible, merge following patches to address
Krzysztof concern.
- [PATCH v5 2/7] dt-bindings: remoteproc: Add compatibility for TEE support
- [PATCH v5 3/7] dt-bindings: remoteproc: Add processor identifier property
More details on updates are listed in commits messages.
[1] https://lore.kernel.org/lkml/Zlil4YSjHxb0FRgf@p14s/T/
[2] https://lore.kernel.org/lkml/[email protected]/
base-commit: 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
Description of the feature:
--------------------------
This series proposes the implementation of a remoteproc tee driver to
communicate with a TEE trusted application responsible for authenticating
and loading the remoteproc firmware image in an Arm secure context.
1) Principle:
The remoteproc tee driver provides services to communicate with the OP-TEE
trusted application running on the Trusted Execution Context (TEE).
The trusted application in TEE manages the remote processor lifecycle:
- authenticating and loading firmware images,
- isolating and securing the remote processor memories,
- supporting multi-firmware (e.g., TF-M + Zephyr on a Cortex-M33),
- managing the start and stop of the firmware by the TEE.
2) Format of the signed image:
Refer to:
https://github.com/OP-TEE/optee_os/blob/master/ta/remoteproc/src/remoteproc_core.c#L18-L57
3) OP-TEE trusted application API:
Refer to:
https://github.com/OP-TEE/optee_os/blob/master/ta/remoteproc/include/ta_remoteproc.h
4) OP-TEE signature script
Refer to:
https://github.com/OP-TEE/optee_os/blob/master/scripts/sign_rproc_fw.py
Example of usage:
sign_rproc_fw.py --in <fw1.elf> --in <fw2.elf> --out <signed_fw.sign> --key ${OP-TEE_PATH}/keys/default.pem
5) Impact on User space Application
No sysfs impact.the user only needs to provide the signed firmware image
instead of the ELF image.
For more information about the implementation, a presentation is available here
(note that the format of the signed image has evolved between the presentation
and the integration in OP-TEE).
https://resources.linaro.org/en/resource/6c5bGvZwUAjX56fvxthxds
Arnaud Pouliquen (5):
remoteproc: core: Introduce rproc_pa_to_va helper
remoteproc: Add TEE support
dt-bindings: remoteproc: Add compatibility for TEE support
remoteproc: stm32: Create sub-functions to request shutdown and
release
remoteproc: stm32: Add support of an OP-TEE TA to load the firmware
.../bindings/remoteproc/st,stm32-rproc.yaml | 58 ++-
drivers/remoteproc/Kconfig | 10 +
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/remoteproc_core.c | 74 ++-
drivers/remoteproc/stm32_rproc.c | 147 ++++--
drivers/remoteproc/tee_remoteproc.c | 451 ++++++++++++++++++
include/linux/remoteproc.h | 7 +
include/linux/tee_remoteproc.h | 99 ++++
8 files changed, 801 insertions(+), 46 deletions(-)
create mode 100644 drivers/remoteproc/tee_remoteproc.c
create mode 100644 include/linux/tee_remoteproc.h
base-commit: 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
--
2.25.1
When a resource table is loaded by an external entity such as U-boot or
OP-TEE, We not necessary get the device address(da) but the physical
address(pa).
This helper performs similar translation than the rproc_da_to_va()
but based on a physical address.
Signed-off-by: Arnaud Pouliquen <[email protected]>
---
drivers/remoteproc/remoteproc_core.c | 74 +++++++++++++++++++++++++++-
include/linux/remoteproc.h | 3 ++
2 files changed, 75 insertions(+), 2 deletions(-)
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index f276956f2c5c..3fdec0336fd6 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -230,6 +230,77 @@ void *rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
}
EXPORT_SYMBOL(rproc_da_to_va);
+/**
+ * rproc_pa_to_va() - lookup the kernel virtual address for a physical address of a remoteproc
+ * memory
+ *
+ * @rproc: handle of a remote processor
+ * @pa: remoteproc physical address
+ * @len: length of the memory region @pa is pointing to
+ * @is_iomem: optional pointer filled in to indicate if @da is iomapped memory
+ *
+ * Some remote processors will ask us to allocate them physically contiguous
+ * memory regions (which we call "carveouts"), and map them to specific
+ * device addresses (which are hardcoded in the firmware). They may also have
+ * dedicated memory regions internal to the processors, and use them either
+ * exclusively or alongside carveouts.
+ *
+ * They may then ask us to copy objects into specific addresses (e.g.
+ * code/data sections) or expose us certain symbols in other device address
+ * (e.g. their trace buffer).
+ *
+ * This function is a helper function with which we can go over the allocated
+ * carveouts and translate specific physical addresses to kernel virtual addresses
+ * so we can access the referenced memory. This function also allows to perform
+ * translations on the internal remoteproc memory regions through a platform
+ * implementation specific pa_to_va ops, if present.
+ *
+ * Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too,
+ * but only on kernel direct mapped RAM memory. Instead, we're just using
+ * here the output of the DMA API for the carveouts, which should be more
+ * correct.
+ *
+ * Return: a valid kernel address on success or NULL on failure
+ */
+void *rproc_pa_to_va(struct rproc *rproc, phys_addr_t pa, size_t len, bool *is_iomem)
+{
+ struct rproc_mem_entry *carveout;
+ void *ptr = NULL;
+
+ if (rproc->ops->da_to_va) {
+ ptr = rproc->ops->pa_to_va(rproc, pa, len);
+ if (ptr)
+ goto out;
+ }
+
+ list_for_each_entry(carveout, &rproc->carveouts, node) {
+ int offset = pa - carveout->dma;
+
+ /* Verify that carveout is allocated */
+ if (!carveout->va)
+ continue;
+
+ /* try next carveout if da is too small */
+ if (offset < 0)
+ continue;
+
+ /* try next carveout if da is too large */
+ if (offset + len > carveout->len)
+ continue;
+
+ ptr = carveout->va + offset;
+
+ if (is_iomem)
+ *is_iomem = carveout->is_iomem;
+
+ break;
+ }
+
+out:
+ return ptr;
+}
+EXPORT_SYMBOL(rproc_pa_to_va);
+
/**
* rproc_find_carveout_by_name() - lookup the carveout region by a name
* @rproc: handle of a remote processor
@@ -724,8 +795,7 @@ static int rproc_alloc_carveout(struct rproc *rproc,
* firmware was compiled with.
*
* In this case, we must use the IOMMU API directly and map
- * the memory to the device address as expected by the remote
- * processor.
+ * the memory to the device address as etable
*
* Obviously such remote processor devices should not be configured
* to use the iommu-based DMA API: we expect 'dma' to contain the
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index b4795698d8c2..28aa62a3b505 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -367,6 +367,7 @@ enum rsc_handling_status {
* @detach: detach from a device, leaving it powered up
* @kick: kick a virtqueue (virtqueue id given as a parameter)
* @da_to_va: optional platform hook to perform address translations
+ * @pa_to_va: optional platform hook to perform address translations
* @parse_fw: parse firmware to extract information (e.g. resource table)
* @handle_rsc: optional platform hook to handle vendor resources. Should return
* RSC_HANDLED if resource was handled, RSC_IGNORED if not handled
@@ -391,6 +392,7 @@ struct rproc_ops {
int (*detach)(struct rproc *rproc);
void (*kick)(struct rproc *rproc, int vqid);
void * (*da_to_va)(struct rproc *rproc, u64 da, size_t len, bool *is_iomem);
+ void * (*pa_to_va)(struct rproc *rproc, phys_addr_t da, size_t len);
int (*parse_fw)(struct rproc *rproc, const struct firmware *fw);
int (*handle_rsc)(struct rproc *rproc, u32 rsc_type, void *rsc,
int offset, int avail);
@@ -690,6 +692,7 @@ int rproc_detach(struct rproc *rproc);
int rproc_set_firmware(struct rproc *rproc, const char *fw_name);
void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
void *rproc_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem);
+void *rproc_pa_to_va(struct rproc *rproc, phys_addr_t pa, size_t len, bool *is_iomem);
/* from remoteproc_coredump.c */
void rproc_coredump_cleanup(struct rproc *rproc);
--
2.25.1
To prepare for the support of TEE remoteproc, create sub-functions
that can be used in both cases, with and without remoteproc TEE support.
Signed-off-by: Arnaud Pouliquen <[email protected]>
---
drivers/remoteproc/stm32_rproc.c | 84 +++++++++++++++++++-------------
1 file changed, 51 insertions(+), 33 deletions(-)
diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
index 88623df7d0c3..8cd838df4e92 100644
--- a/drivers/remoteproc/stm32_rproc.c
+++ b/drivers/remoteproc/stm32_rproc.c
@@ -209,6 +209,54 @@ static int stm32_rproc_mbox_idx(struct rproc *rproc, const unsigned char *name)
return -EINVAL;
}
+static void stm32_rproc_request_shutdown(struct rproc *rproc)
+{
+ struct stm32_rproc *ddata = rproc->priv;
+ int err, dummy_data, idx;
+
+ /* Request shutdown of the remote processor */
+ if (rproc->state != RPROC_OFFLINE && rproc->state != RPROC_CRASHED) {
+ idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_SHUTDOWN);
+ if (idx >= 0 && ddata->mb[idx].chan) {
+ /* A dummy data is sent to allow to block on transmit. */
+ err = mbox_send_message(ddata->mb[idx].chan,
+ &dummy_data);
+ if (err < 0)
+ dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
+ }
+ }
+}
+
+static int stm32_rproc_release(struct rproc *rproc)
+{
+ struct stm32_rproc *ddata = rproc->priv;
+ unsigned int err = 0;
+
+ /* To allow platform Standby power mode, set remote proc Deep Sleep. */
+ if (ddata->pdds.map) {
+ err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
+ ddata->pdds.mask, 1);
+ if (err) {
+ dev_err(&rproc->dev, "failed to set pdds\n");
+ return err;
+ }
+ }
+
+ /* Update coprocessor state to OFF if available. */
+ if (ddata->m4_state.map) {
+ err = regmap_update_bits(ddata->m4_state.map,
+ ddata->m4_state.reg,
+ ddata->m4_state.mask,
+ M4_STATE_OFF);
+ if (err) {
+ dev_err(&rproc->dev, "failed to set copro state\n");
+ return err;
+ }
+ }
+
+ return 0;
+}
+
static int stm32_rproc_prepare(struct rproc *rproc)
{
struct device *dev = rproc->dev.parent;
@@ -519,17 +567,9 @@ static int stm32_rproc_detach(struct rproc *rproc)
static int stm32_rproc_stop(struct rproc *rproc)
{
struct stm32_rproc *ddata = rproc->priv;
- int err, idx;
+ int err;
- /* request shutdown of the remote processor */
- if (rproc->state != RPROC_OFFLINE && rproc->state != RPROC_CRASHED) {
- idx = stm32_rproc_mbox_idx(rproc, STM32_MBX_SHUTDOWN);
- if (idx >= 0 && ddata->mb[idx].chan) {
- err = mbox_send_message(ddata->mb[idx].chan, "detach");
- if (err < 0)
- dev_warn(&rproc->dev, "warning: remote FW shutdown without ack\n");
- }
- }
+ stm32_rproc_request_shutdown(rproc);
err = stm32_rproc_set_hold_boot(rproc, true);
if (err)
@@ -541,29 +581,7 @@ static int stm32_rproc_stop(struct rproc *rproc)
return err;
}
- /* to allow platform Standby power mode, set remote proc Deep Sleep */
- if (ddata->pdds.map) {
- err = regmap_update_bits(ddata->pdds.map, ddata->pdds.reg,
- ddata->pdds.mask, 1);
- if (err) {
- dev_err(&rproc->dev, "failed to set pdds\n");
- return err;
- }
- }
-
- /* update coprocessor state to OFF if available */
- if (ddata->m4_state.map) {
- err = regmap_update_bits(ddata->m4_state.map,
- ddata->m4_state.reg,
- ddata->m4_state.mask,
- M4_STATE_OFF);
- if (err) {
- dev_err(&rproc->dev, "failed to set copro state\n");
- return err;
- }
- }
-
- return 0;
+ return stm32_rproc_release(rproc);
}
static void stm32_rproc_kick(struct rproc *rproc, int vqid)
--
2.25.1
Add a remoteproc TEE (Trusted Execution Environment) driver
that will be probed by the TEE bus. If the associated Trusted
application is supported on secure part this driver offers a client
interface to load a firmware in the secure part.
This firmware could be authenticated by the secure trusted application.
Signed-off-by: Arnaud Pouliquen <[email protected]>
---
update from previous version
- make tee_rproc_get_loaded_rsc_table() local and replace this API by
tee_rproc_find_loaded_rsc_table()
- map and unmap the resource table in tee_rproc_parse_fw to make a cached copy
- use the new rproc_pa_to_va() API to map the resource table memory declared in carevout
- remove tee_rproc_release_loaded_rsc_table as no more used.
---
drivers/remoteproc/Kconfig | 10 +
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/tee_remoteproc.c | 451 ++++++++++++++++++++++++++++
include/linux/remoteproc.h | 4 +
include/linux/tee_remoteproc.h | 99 ++++++
5 files changed, 565 insertions(+)
create mode 100644 drivers/remoteproc/tee_remoteproc.c
create mode 100644 include/linux/tee_remoteproc.h
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 48845dc8fa85..6c1c07202276 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -365,6 +365,16 @@ config XLNX_R5_REMOTEPROC
It's safe to say N if not interested in using RPU r5f cores.
+
+config TEE_REMOTEPROC
+ tristate "Remoteproc support by a TEE application"
+ depends on OPTEE
+ help
+ Support a remote processor with a TEE application. The Trusted
+ Execution Context is responsible for loading the trusted firmware
+ image and managing the remote processor's lifecycle.
+ This can be either built-in or a loadable module.
+
endif # REMOTEPROC
endmenu
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 91314a9b43ce..fa8daebce277 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_RCAR_REMOTEPROC) += rcar_rproc.o
obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o
obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o
obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o
+obj-$(CONFIG_TEE_REMOTEPROC) += tee_remoteproc.o
obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
obj-$(CONFIG_TI_K3_R5_REMOTEPROC) += ti_k3_r5_remoteproc.o
obj-$(CONFIG_XLNX_R5_REMOTEPROC) += xlnx_r5_remoteproc.o
diff --git a/drivers/remoteproc/tee_remoteproc.c b/drivers/remoteproc/tee_remoteproc.c
new file mode 100644
index 000000000000..9455fd9d0d2d
--- /dev/null
+++ b/drivers/remoteproc/tee_remoteproc.c
@@ -0,0 +1,451 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) STMicroelectronics 2024 - All Rights Reserved
+ * Author: Arnaud Pouliquen <[email protected]>
+ */
+
+#include <linux/firmware.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/remoteproc.h>
+#include <linux/slab.h>
+#include <linux/tee_drv.h>
+#include <linux/tee_remoteproc.h>
+
+#include "remoteproc_internal.h"
+
+#define MAX_TEE_PARAM_ARRY_MEMBER 4
+
+/*
+ * Authentication of the firmware and load in the remote processor memory
+ *
+ * [in] params[0].value.a: unique 32bit identifier of the remote processor
+ * [in] params[1].memref: buffer containing the image of the buffer
+ */
+#define TA_RPROC_FW_CMD_LOAD_FW 1
+
+/*
+ * Start the remote processor
+ *
+ * [in] params[0].value.a: unique 32bit identifier of the remote processor
+ */
+#define TA_RPROC_FW_CMD_START_FW 2
+
+/*
+ * Stop the remote processor
+ *
+ * [in] params[0].value.a: unique 32bit identifier of the remote processor
+ */
+#define TA_RPROC_FW_CMD_STOP_FW 3
+
+/*
+ * Return the address of the resource table, or 0 if not found
+ * No check is done to verify that the address returned is accessible by
+ * the non secure context. If the resource table is loaded in a protected
+ * memory the access by the non secure context will lead to a data abort.
+ *
+ * [in] params[0].value.a: unique 32bit identifier of the remote processor
+ * [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
+
+/*
+ * Return the address of the core dump
+ *
+ * [in] params[0].value.a: unique 32bit identifier of the remote processor
+ * [out] params[1].memref: address of the core dump image if exist,
+ * else return Null
+ */
+#define TA_RPROC_FW_CMD_GET_COREDUMP 5
+
+struct tee_rproc_context {
+ struct list_head sessions;
+ struct tee_context *tee_ctx;
+ struct device *dev;
+};
+
+static struct tee_rproc_context *tee_rproc_ctx;
+
+static void tee_rproc_prepare_args(struct tee_rproc *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_ARRY_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,
+ };
+}
+
+int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+ struct tee_rproc *trproc = rproc->tee_interface;
+ struct tee_ioctl_invoke_arg arg;
+ struct tee_shm *fw_shm;
+ int ret;
+
+ if (!trproc)
+ return -EINVAL;
+
+ fw_shm = tee_shm_register_kernel_buf(tee_rproc_ctx->tee_ctx, (void *)fw->data, fw->size);
+ if (IS_ERR(fw_shm))
+ return PTR_ERR(fw_shm);
+
+ tee_rproc_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(tee_rproc_ctx->tee_ctx, &arg, param);
+ if (ret < 0 || arg.ret != 0) {
+ dev_err(tee_rproc_ctx->dev,
+ "TA_RPROC_FW_CMD_LOAD_FW invoke failed TEE err: %x, ret:%x\n",
+ arg.ret, ret);
+ if (!ret)
+ ret = -EIO;
+ }
+
+ tee_shm_free(fw_shm);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_load_fw);
+
+static int tee_rproc_get_loaded_rsc_table(struct rproc *rproc, phys_addr_t *rsc_pa,
+ size_t *table_sz)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+ struct tee_rproc *trproc = rproc->tee_interface;
+ struct tee_ioctl_invoke_arg arg;
+ int ret;
+
+ tee_rproc_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(tee_rproc_ctx->tee_ctx, &arg, param);
+ if (ret < 0 || arg.ret != 0) {
+ dev_err(tee_rproc_ctx->dev,
+ "TA_RPROC_FW_CMD_GET_RSC_TABLE invoke failed TEE err: %x, ret:%x\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;
+}
+
+int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
+{
+ phys_addr_t rsc_table;
+ void __iomem *rsc_va;
+ size_t table_sz;
+ int ret;
+
+ ret = tee_rproc_load_fw(rproc, fw);
+ if (ret)
+ return ret;
+
+ ret = tee_rproc_get_loaded_rsc_table(rproc, &rsc_table, &table_sz);
+ if (ret)
+ return ret;
+
+ /*
+ * 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 (IS_ERR_OR_NULL(rsc_va)) {
+ dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %pa+%zx\n",
+ &rsc_table, table_sz);
+ return -ENOMEM;
+ }
+
+ /*
+ * Create a copy of the resource table to have the same behavior as the elf loader.
+ * This cached table will be used after the remoteproc stops to free resources, and for
+ * crash recovery to reapply the settings.
+ */
+ rproc->cached_table = kmemdup((__force void *)rsc_va, table_sz, GFP_KERNEL);
+ if (!rproc->cached_table) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ rproc->table_ptr = rproc->cached_table;
+ rproc->table_sz = table_sz;
+
+out:
+ iounmap(rsc_va);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_parse_fw);
+
+struct resource_table *tee_rproc_find_loaded_rsc_table(struct rproc *rproc,
+ const struct firmware *fw)
+{
+ struct tee_rproc *trproc = rproc->tee_interface;
+ phys_addr_t rsc_table;
+ size_t table_sz;
+ int ret;
+
+ if (!trproc)
+ return ERR_PTR(-EINVAL);
+
+ ret = tee_rproc_get_loaded_rsc_table(rproc, &rsc_table, &table_sz);
+ if (ret)
+ return ERR_PTR(ret);
+
+ rproc->table_sz = table_sz;
+ if (!table_sz)
+ return NULL;
+
+ /*
+ * At this step the memory area that contains the resource table should have be declared
+ * in 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(tee_rproc_find_loaded_rsc_table);
+
+int tee_rproc_start(struct rproc *rproc)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+ struct tee_rproc *trproc = rproc->tee_interface;
+ struct tee_ioctl_invoke_arg arg;
+ int ret = 0;
+
+ if (!trproc)
+ return -EINVAL;
+
+ tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_START_FW, &arg, param, 0);
+
+ ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param);
+ if (ret < 0 || arg.ret != 0) {
+ dev_err(tee_rproc_ctx->dev,
+ "TA_RPROC_FW_CMD_START_FW invoke failed TEE err: %x, ret:%x\n",
+ arg.ret, ret);
+ if (!ret)
+ return -EIO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_start);
+
+int tee_rproc_stop(struct rproc *rproc)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+ struct tee_rproc *trproc = rproc->tee_interface;
+ struct tee_ioctl_invoke_arg arg;
+ int ret;
+
+ if (!trproc)
+ return -EINVAL;
+
+ tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_STOP_FW, &arg, param, 0);
+
+ ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param);
+ if (ret < 0 || arg.ret != 0) {
+ dev_err(tee_rproc_ctx->dev,
+ "TA_RPROC_FW_CMD_STOP_FW invoke failed TEE err: %x, ret:%x\n",
+ arg.ret, ret);
+ if (!ret)
+ ret = -EIO;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_stop);
+
+static const struct tee_client_device_id stm32_tee_rproc_id_table[] = {
+ {UUID_INIT(0x80a4c275, 0x0a47, 0x4905,
+ 0x82, 0x85, 0x14, 0x86, 0xa9, 0x77, 0x1a, 0x08)},
+ {}
+};
+
+struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc, unsigned int rproc_id)
+{
+ struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
+ struct tee_ioctl_open_session_arg sess_arg;
+ struct tee_client_device *tee_device;
+ struct tee_rproc *trproc, *p_err;
+ int ret;
+
+ /*
+ * 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 (!tee_rproc_ctx)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ /* Prevent tee rproc module from being removed */
+ if (!try_module_get(THIS_MODULE)) {
+ dev_err(tee_rproc_ctx->dev, "can't get owner\n");
+ p_err = ERR_PTR(-ENODEV);
+ goto module_put;
+ }
+
+ trproc = devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL);
+ if (!trproc) {
+ p_err = ERR_PTR(-ENOMEM);
+ goto module_put;
+ }
+ tee_device = to_tee_client_device(tee_rproc_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(tee_rproc_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);
+ p_err = ERR_PTR(-EINVAL);
+ goto module_put;
+ }
+
+ trproc->parent = dev;
+ trproc->rproc_id = rproc_id;
+ trproc->session_id = sess_arg.session;
+
+ trproc->rproc = rproc;
+ rproc->tee_interface = trproc;
+
+ list_add_tail(&trproc->node, &tee_rproc_ctx->sessions);
+
+ return trproc;
+
+module_put:
+ module_put(THIS_MODULE);
+ return p_err;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_register);
+
+int tee_rproc_unregister(struct tee_rproc *trproc)
+{
+ struct rproc *rproc = trproc->rproc;
+ int ret;
+
+ ret = tee_client_close_session(tee_rproc_ctx->tee_ctx, trproc->session_id);
+ if (ret < 0)
+ dev_err(trproc->parent, "tee_client_close_session failed, err: %x\n", ret);
+
+ list_del(&trproc->node);
+ rproc->tee_interface = NULL;
+
+ module_put(THIS_MODULE);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(tee_rproc_unregister);
+
+static int tee_rproc_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 tee_rproc_probe(struct device *dev)
+{
+ struct tee_context *tee_ctx;
+ int ret;
+
+ /* Open context with TEE driver */
+ tee_ctx = tee_client_open_context(NULL, tee_rproc_ctx_match, NULL, NULL);
+ if (IS_ERR(tee_ctx))
+ return PTR_ERR(tee_ctx);
+
+ tee_rproc_ctx = devm_kzalloc(dev, sizeof(*tee_ctx), GFP_KERNEL);
+ if (!tee_rproc_ctx) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ tee_rproc_ctx->dev = dev;
+ tee_rproc_ctx->tee_ctx = tee_ctx;
+ INIT_LIST_HEAD(&tee_rproc_ctx->sessions);
+
+ return 0;
+err:
+ tee_client_close_context(tee_ctx);
+
+ return ret;
+}
+
+static int tee_rproc_remove(struct device *dev)
+{
+ struct tee_rproc *entry, *tmp;
+
+ list_for_each_entry_safe(entry, tmp, &tee_rproc_ctx->sessions, node) {
+ tee_client_close_session(tee_rproc_ctx->tee_ctx, entry->session_id);
+ list_del(&entry->node);
+ kfree(entry);
+ }
+
+ tee_client_close_context(tee_rproc_ctx->tee_ctx);
+
+ return 0;
+}
+
+MODULE_DEVICE_TABLE(tee, stm32_tee_rproc_id_table);
+
+static struct tee_client_driver tee_rproc_fw_driver = {
+ .id_table = stm32_tee_rproc_id_table,
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .bus = &tee_bus_type,
+ .probe = tee_rproc_probe,
+ .remove = tee_rproc_remove,
+ },
+};
+
+static int __init tee_rproc_fw_mod_init(void)
+{
+ return driver_register(&tee_rproc_fw_driver.driver);
+}
+
+static void __exit tee_rproc_fw_mod_exit(void)
+{
+ driver_unregister(&tee_rproc_fw_driver.driver);
+}
+
+module_init(tee_rproc_fw_mod_init);
+module_exit(tee_rproc_fw_mod_exit);
+
+MODULE_DESCRIPTION(" TEE remote processor control driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 28aa62a3b505..6168f778414f 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -505,6 +505,8 @@ enum rproc_features {
RPROC_MAX_FEATURES,
};
+struct tee_rproc;
+
/**
* struct rproc - represents a physical remote processor device
* @node: list node of this rproc object
@@ -547,6 +549,7 @@ enum rproc_features {
* @cdev: character device of the rproc
* @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release
* @features: indicate remoteproc features
+ * @tee_interface: pointer to the remoteproc tee context
*/
struct rproc {
struct list_head node;
@@ -588,6 +591,7 @@ struct rproc {
struct cdev cdev;
bool cdev_put_on_release;
DECLARE_BITMAP(features, RPROC_MAX_FEATURES);
+ struct tee_rproc *tee_interface;
};
/**
diff --git a/include/linux/tee_remoteproc.h b/include/linux/tee_remoteproc.h
new file mode 100644
index 000000000000..657af883d99a
--- /dev/null
+++ b/include/linux/tee_remoteproc.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2024 STMicroelectronics - All Rights Reserved
+ */
+
+#ifndef TEE_REMOTEPROC_H
+#define TEE_REMOTEPROC_H
+
+#include <linux/tee_drv.h>
+#include <linux/firmware.h>
+#include <linux/remoteproc.h>
+
+struct rproc;
+
+/**
+ * struct tee_rproc - TEE remoteproc structure
+ * @node: Reference in list
+ * @rproc: Remoteproc reference
+ * @parent: Parent device
+ * @rproc_id: Identifier of the target firmware
+ * @session_id: TEE session identifier
+ */
+struct tee_rproc {
+ struct list_head node;
+ struct rproc *rproc;
+ struct device *parent;
+ u32 rproc_id;
+ u32 session_id;
+};
+
+#if IS_REACHABLE(CONFIG_TEE_REMOTEPROC)
+
+struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc,
+ unsigned int rproc_id);
+int tee_rproc_unregister(struct tee_rproc *trproc);
+int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw);
+int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw);
+struct resource_table *tee_rproc_find_loaded_rsc_table(struct rproc *rproc,
+ const struct firmware *fw);
+int tee_rproc_start(struct rproc *rproc);
+int tee_rproc_stop(struct rproc *rproc);
+
+#else
+
+static inline struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc,
+ unsigned int rproc_id)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+static int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline int tee_rproc_unregister(struct tee_rproc *trproc)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline int tee_rproc_start(struct rproc *rproc)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline int tee_rproc_stop(struct rproc *rproc)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return 0;
+}
+
+static inline struct resource_table *
+tee_rproc_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw)
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return NULL;
+}
+#endif /* CONFIG_TEE_REMOTEPROC */
+#endif /* TEE_REMOTEPROC_H */
--
2.25.1
On 6/7/24 11:33, Arnaud Pouliquen wrote:
> Add a remoteproc TEE (Trusted Execution Environment) driver
> that will be probed by the TEE bus. If the associated Trusted
> application is supported on secure part this driver offers a client
> interface to load a firmware in the secure part.
> This firmware could be authenticated by the secure trusted application.
>
> Signed-off-by: Arnaud Pouliquen <[email protected]>
> ---
> update from previous version
> - make tee_rproc_get_loaded_rsc_table() local and replace this API by
> tee_rproc_find_loaded_rsc_table()
> - map and unmap the resource table in tee_rproc_parse_fw to make a cached copy
> - use the new rproc_pa_to_va() API to map the resource table memory declared in carevout
> - remove tee_rproc_release_loaded_rsc_table as no more used.
> ---
> drivers/remoteproc/Kconfig | 10 +
> drivers/remoteproc/Makefile | 1 +
> drivers/remoteproc/tee_remoteproc.c | 451 ++++++++++++++++++++++++++++
> include/linux/remoteproc.h | 4 +
> include/linux/tee_remoteproc.h | 99 ++++++
> 5 files changed, 565 insertions(+)
> create mode 100644 drivers/remoteproc/tee_remoteproc.c
> create mode 100644 include/linux/tee_remoteproc.h
>
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 48845dc8fa85..6c1c07202276 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -365,6 +365,16 @@ config XLNX_R5_REMOTEPROC
>
> It's safe to say N if not interested in using RPU r5f cores.
>
> +
> +config TEE_REMOTEPROC
> + tristate "Remoteproc support by a TEE application"
> + depends on OPTEE
> + help
> + Support a remote processor with a TEE application. The Trusted
> + Execution Context is responsible for loading the trusted firmware
> + image and managing the remote processor's lifecycle.
> + This can be either built-in or a loadable module.
> +
> endif # REMOTEPROC
>
> endmenu
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 91314a9b43ce..fa8daebce277 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -36,6 +36,7 @@ obj-$(CONFIG_RCAR_REMOTEPROC) += rcar_rproc.o
> obj-$(CONFIG_ST_REMOTEPROC) += st_remoteproc.o
> obj-$(CONFIG_ST_SLIM_REMOTEPROC) += st_slim_rproc.o
> obj-$(CONFIG_STM32_RPROC) += stm32_rproc.o
> +obj-$(CONFIG_TEE_REMOTEPROC) += tee_remoteproc.o
> obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) += ti_k3_dsp_remoteproc.o
> obj-$(CONFIG_TI_K3_R5_REMOTEPROC) += ti_k3_r5_remoteproc.o
> obj-$(CONFIG_XLNX_R5_REMOTEPROC) += xlnx_r5_remoteproc.o
> diff --git a/drivers/remoteproc/tee_remoteproc.c b/drivers/remoteproc/tee_remoteproc.c
> new file mode 100644
> index 000000000000..9455fd9d0d2d
> --- /dev/null
> +++ b/drivers/remoteproc/tee_remoteproc.c
> @@ -0,0 +1,451 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) STMicroelectronics 2024 - All Rights Reserved
> + * Author: Arnaud Pouliquen <[email protected]>
> + */
> +
> +#include <linux/firmware.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/remoteproc.h>
> +#include <linux/slab.h>
> +#include <linux/tee_drv.h>
> +#include <linux/tee_remoteproc.h>
> +
> +#include "remoteproc_internal.h"
> +
> +#define MAX_TEE_PARAM_ARRY_MEMBER 4
> +
> +/*
> + * Authentication of the firmware and load in the remote processor memory
> + *
> + * [in] params[0].value.a: unique 32bit identifier of the remote processor
> + * [in] params[1].memref: buffer containing the image of the buffer
> + */
> +#define TA_RPROC_FW_CMD_LOAD_FW 1
> +
> +/*
> + * Start the remote processor
> + *
> + * [in] params[0].value.a: unique 32bit identifier of the remote processor
> + */
> +#define TA_RPROC_FW_CMD_START_FW 2
> +
> +/*
> + * Stop the remote processor
> + *
> + * [in] params[0].value.a: unique 32bit identifier of the remote processor
> + */
> +#define TA_RPROC_FW_CMD_STOP_FW 3
> +
> +/*
> + * Return the address of the resource table, or 0 if not found
> + * No check is done to verify that the address returned is accessible by
> + * the non secure context. If the resource table is loaded in a protected
> + * memory the access by the non secure context will lead to a data abort.
> + *
> + * [in] params[0].value.a: unique 32bit identifier of the remote processor
> + * [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
> +
> +/*
> + * Return the address of the core dump
> + *
> + * [in] params[0].value.a: unique 32bit identifier of the remote processor
> + * [out] params[1].memref: address of the core dump image if exist,
> + * else return Null
> + */
> +#define TA_RPROC_FW_CMD_GET_COREDUMP 5
> +
> +struct tee_rproc_context {
> + struct list_head sessions;
> + struct tee_context *tee_ctx;
> + struct device *dev;
> +};
> +
> +static struct tee_rproc_context *tee_rproc_ctx;
> +
> +static void tee_rproc_prepare_args(struct tee_rproc *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_ARRY_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,
> + };
> +}
> +
> +int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_rproc *trproc = rproc->tee_interface;
> + struct tee_ioctl_invoke_arg arg;
> + struct tee_shm *fw_shm;
> + int ret;
> +
> + if (!trproc)
> + return -EINVAL;
> +
> + fw_shm = tee_shm_register_kernel_buf(tee_rproc_ctx->tee_ctx, (void *)fw->data, fw->size);
> + if (IS_ERR(fw_shm))
> + return PTR_ERR(fw_shm);
> +
> + tee_rproc_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(tee_rproc_ctx->tee_ctx, &arg, param);
> + if (ret < 0 || arg.ret != 0) {
> + dev_err(tee_rproc_ctx->dev,
> + "TA_RPROC_FW_CMD_LOAD_FW invoke failed TEE err: %x, ret:%x\n",
> + arg.ret, ret);
> + if (!ret)
> + ret = -EIO;
> + }
> +
> + tee_shm_free(fw_shm);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_load_fw);
> +
> +static int tee_rproc_get_loaded_rsc_table(struct rproc *rproc, phys_addr_t *rsc_pa,
> + size_t *table_sz)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_rproc *trproc = rproc->tee_interface;
> + struct tee_ioctl_invoke_arg arg;
> + int ret;
> +
> + tee_rproc_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(tee_rproc_ctx->tee_ctx, &arg, param);
> + if (ret < 0 || arg.ret != 0) {
> + dev_err(tee_rproc_ctx->dev,
> + "TA_RPROC_FW_CMD_GET_RSC_TABLE invoke failed TEE err: %x, ret:%x\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;
> +}
> +
> +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> + phys_addr_t rsc_table;
> + void __iomem *rsc_va;
> + size_t table_sz;
> + int ret;
> +
> + ret = tee_rproc_load_fw(rproc, fw);
> + if (ret)
> + return ret;
> +
> + ret = tee_rproc_get_loaded_rsc_table(rproc, &rsc_table, &table_sz);
> + if (ret)
> + return ret;
> +
> + /*
> + * 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 (IS_ERR_OR_NULL(rsc_va)) {
> + dev_err(tee_rproc_ctx->dev, "Unable to map memory region: %pa+%zx\n",
> + &rsc_table, table_sz);
> + return -ENOMEM;
> + }
> +
> + /*
> + * Create a copy of the resource table to have the same behavior as the elf loader.
> + * This cached table will be used after the remoteproc stops to free resources, and for
> + * crash recovery to reapply the settings.
> + */
> + rproc->cached_table = kmemdup((__force void *)rsc_va, table_sz, GFP_KERNEL);
> + if (!rproc->cached_table) {
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> + rproc->table_ptr = rproc->cached_table;
> + rproc->table_sz = table_sz;
> +
> +out:
> + iounmap(rsc_va);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_parse_fw);
> +
> +struct resource_table *tee_rproc_find_loaded_rsc_table(struct rproc *rproc,
> + const struct firmware *fw)
> +{
> + struct tee_rproc *trproc = rproc->tee_interface;
> + phys_addr_t rsc_table;
> + size_t table_sz;
> + int ret;
> +
> + if (!trproc)
> + return ERR_PTR(-EINVAL);
> +
> + ret = tee_rproc_get_loaded_rsc_table(rproc, &rsc_table, &table_sz);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + rproc->table_sz = table_sz;
> + if (!table_sz)
> + return NULL;
> +
> + /*
> + * At this step the memory area that contains the resource table should have be declared
> + * in 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(tee_rproc_find_loaded_rsc_table);
> +
> +int tee_rproc_start(struct rproc *rproc)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_rproc *trproc = rproc->tee_interface;
> + struct tee_ioctl_invoke_arg arg;
> + int ret = 0;
> +
> + if (!trproc)
> + return -EINVAL;
> +
> + tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_START_FW, &arg, param, 0);
> +
> + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param);
> + if (ret < 0 || arg.ret != 0) {
> + dev_err(tee_rproc_ctx->dev,
> + "TA_RPROC_FW_CMD_START_FW invoke failed TEE err: %x, ret:%x\n",
> + arg.ret, ret);
> + if (!ret)
> + return -EIO;
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_start);
> +
> +int tee_rproc_stop(struct rproc *rproc)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_rproc *trproc = rproc->tee_interface;
> + struct tee_ioctl_invoke_arg arg;
> + int ret;
> +
> + if (!trproc)
> + return -EINVAL;
> +
> + tee_rproc_prepare_args(trproc, TA_RPROC_FW_CMD_STOP_FW, &arg, param, 0);
> +
> + ret = tee_client_invoke_func(tee_rproc_ctx->tee_ctx, &arg, param);
> + if (ret < 0 || arg.ret != 0) {
> + dev_err(tee_rproc_ctx->dev,
> + "TA_RPROC_FW_CMD_STOP_FW invoke failed TEE err: %x, ret:%x\n",
> + arg.ret, ret);
> + if (!ret)
> + ret = -EIO;
> + }
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_stop);
> +
> +static const struct tee_client_device_id stm32_tee_rproc_id_table[] = {
> + {UUID_INIT(0x80a4c275, 0x0a47, 0x4905,
> + 0x82, 0x85, 0x14, 0x86, 0xa9, 0x77, 0x1a, 0x08)},
> + {}
> +};
> +
> +struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc, unsigned int rproc_id)
> +{
> + struct tee_param param[MAX_TEE_PARAM_ARRY_MEMBER];
> + struct tee_ioctl_open_session_arg sess_arg;
> + struct tee_client_device *tee_device;
> + struct tee_rproc *trproc, *p_err;
> + int ret;
> +
> + /*
> + * 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 (!tee_rproc_ctx)
> + return ERR_PTR(-EPROBE_DEFER);
> +
> + /* Prevent tee rproc module from being removed */
> + if (!try_module_get(THIS_MODULE)) {
> + dev_err(tee_rproc_ctx->dev, "can't get owner\n");
> + p_err = ERR_PTR(-ENODEV);
> + goto module_put;
> + }
> +
> + trproc = devm_kzalloc(dev, sizeof(*trproc), GFP_KERNEL);
> + if (!trproc) {
> + p_err = ERR_PTR(-ENOMEM);
> + goto module_put;
> + }
> + tee_device = to_tee_client_device(tee_rproc_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(tee_rproc_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);
> + p_err = ERR_PTR(-EINVAL);
> + goto module_put;
> + }
> +
> + trproc->parent = dev;
> + trproc->rproc_id = rproc_id;
> + trproc->session_id = sess_arg.session;
> +
> + trproc->rproc = rproc;
> + rproc->tee_interface = trproc;
> +
> + list_add_tail(&trproc->node, &tee_rproc_ctx->sessions);
> +
> + return trproc;
> +
> +module_put:
> + module_put(THIS_MODULE);
> + return p_err;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_register);
> +
> +int tee_rproc_unregister(struct tee_rproc *trproc)
> +{
> + struct rproc *rproc = trproc->rproc;
> + int ret;
> +
> + ret = tee_client_close_session(tee_rproc_ctx->tee_ctx, trproc->session_id);
> + if (ret < 0)
> + dev_err(trproc->parent, "tee_client_close_session failed, err: %x\n", ret);
> +
> + list_del(&trproc->node);
> + rproc->tee_interface = NULL;
> +
> + module_put(THIS_MODULE);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(tee_rproc_unregister);
> +
> +static int tee_rproc_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 tee_rproc_probe(struct device *dev)
> +{
> + struct tee_context *tee_ctx;
> + int ret;
> +
> + /* Open context with TEE driver */
> + tee_ctx = tee_client_open_context(NULL, tee_rproc_ctx_match, NULL, NULL);
> + if (IS_ERR(tee_ctx))
> + return PTR_ERR(tee_ctx);
> +
> + tee_rproc_ctx = devm_kzalloc(dev, sizeof(*tee_ctx), GFP_KERNEL);
> + if (!tee_rproc_ctx) {
> + ret = -ENOMEM;
> + goto err;
> + }
> +
> + tee_rproc_ctx->dev = dev;
> + tee_rproc_ctx->tee_ctx = tee_ctx;
> + INIT_LIST_HEAD(&tee_rproc_ctx->sessions);
> +
> + return 0;
> +err:
> + tee_client_close_context(tee_ctx);
> +
> + return ret;
> +}
> +
> +static int tee_rproc_remove(struct device *dev)
> +{
> + struct tee_rproc *entry, *tmp;
> +
> + list_for_each_entry_safe(entry, tmp, &tee_rproc_ctx->sessions, node) {
> + tee_client_close_session(tee_rproc_ctx->tee_ctx, entry->session_id);
> + list_del(&entry->node);
> + kfree(entry);
> + }
> +
> + tee_client_close_context(tee_rproc_ctx->tee_ctx);
> +
> + return 0;
> +}
> +
> +MODULE_DEVICE_TABLE(tee, stm32_tee_rproc_id_table);
> +
> +static struct tee_client_driver tee_rproc_fw_driver = {
> + .id_table = stm32_tee_rproc_id_table,
> + .driver = {
> + .name = KBUILD_MODNAME,
> + .bus = &tee_bus_type,
> + .probe = tee_rproc_probe,
> + .remove = tee_rproc_remove,
> + },
> +};
> +
> +static int __init tee_rproc_fw_mod_init(void)
> +{
> + return driver_register(&tee_rproc_fw_driver.driver);
> +}
> +
> +static void __exit tee_rproc_fw_mod_exit(void)
> +{
> + driver_unregister(&tee_rproc_fw_driver.driver);
> +}
> +
> +module_init(tee_rproc_fw_mod_init);
> +module_exit(tee_rproc_fw_mod_exit);
> +
> +MODULE_DESCRIPTION(" TEE remote processor control driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 28aa62a3b505..6168f778414f 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -505,6 +505,8 @@ enum rproc_features {
> RPROC_MAX_FEATURES,
> };
>
> +struct tee_rproc;
> +
> /**
> * struct rproc - represents a physical remote processor device
> * @node: list node of this rproc object
> @@ -547,6 +549,7 @@ enum rproc_features {
> * @cdev: character device of the rproc
> * @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release
> * @features: indicate remoteproc features
> + * @tee_interface: pointer to the remoteproc tee context
> */
> struct rproc {
> struct list_head node;
> @@ -588,6 +591,7 @@ struct rproc {
> struct cdev cdev;
> bool cdev_put_on_release;
> DECLARE_BITMAP(features, RPROC_MAX_FEATURES);
> + struct tee_rproc *tee_interface;
> };
>
> /**
> diff --git a/include/linux/tee_remoteproc.h b/include/linux/tee_remoteproc.h
> new file mode 100644
> index 000000000000..657af883d99a
> --- /dev/null
> +++ b/include/linux/tee_remoteproc.h
> @@ -0,0 +1,99 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * Copyright(c) 2024 STMicroelectronics - All Rights Reserved
> + */
> +
> +#ifndef TEE_REMOTEPROC_H
> +#define TEE_REMOTEPROC_H
> +
> +#include <linux/tee_drv.h>
> +#include <linux/firmware.h>
> +#include <linux/remoteproc.h>
> +
> +struct rproc;
> +
> +/**
> + * struct tee_rproc - TEE remoteproc structure
> + * @node: Reference in list
> + * @rproc: Remoteproc reference
> + * @parent: Parent device
> + * @rproc_id: Identifier of the target firmware
> + * @session_id: TEE session identifier
> + */
> +struct tee_rproc {
> + struct list_head node;
> + struct rproc *rproc;
> + struct device *parent;
> + u32 rproc_id;
> + u32 session_id;
> +};
> +
> +#if IS_REACHABLE(CONFIG_TEE_REMOTEPROC)
> +
> +struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc,
> + unsigned int rproc_id);
> +int tee_rproc_unregister(struct tee_rproc *trproc);
> +int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw);
> +int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw);
> +struct resource_table *tee_rproc_find_loaded_rsc_table(struct rproc *rproc,
> + const struct firmware *fw);
> +int tee_rproc_start(struct rproc *rproc);
> +int tee_rproc_stop(struct rproc *rproc);
> +
> +#else
> +
> +static inline struct tee_rproc *tee_rproc_register(struct device *dev, struct rproc *rproc,
> + unsigned int rproc_id)
> +{
> + return ERR_PTR(-ENODEV);
> +}
> +
> +static int tee_rproc_parse_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return 0;
> +}
> +
> +static inline int tee_rproc_unregister(struct tee_rproc *trproc)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return 0;
> +}
> +
> +static inline int tee_rproc_load_fw(struct rproc *rproc, const struct firmware *fw)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return 0;
> +}
> +
> +static inline int tee_rproc_start(struct rproc *rproc)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return 0;
> +}
> +
> +static inline int tee_rproc_stop(struct rproc *rproc)
> +{
> + /* This shouldn't be possible */
> + WARN_ON(1);
> +
> + return 0;
> +}
> +
> +static inline struct resource_table *
> +tee_rproc_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw)
> + /* This shouldn't be possible */
Renaming the function I removed the "{" generating the kernel robot complain on
patch 5/5 when config TEE_REMOTEPROC config is not enable
I will send a v7 to fix
> + WARN_ON(1);
> +
> + return NULL;
> +}
> +#endif /* CONFIG_TEE_REMOTEPROC */
> +#endif /* TEE_REMOTEPROC_H */