[PATCH v4 3/5] optee: refactor driver with internal callbacks

Jens Wiklander
2021-08-19T11:07:17Z

The OP-TEE driver is refactored with three internal callbacks replacing
direct calls to optee_from_msg_param(), optee_to_msg_param() and
optee_do_call_with_arg().

These functions a central to communicating with OP-TEE in secure world
by using the SMC Calling Convention directly.

This refactoring makes room for using other primitives to communicate
with OP-TEE in secure world while being able to reuse as much as
possible from the present driver.

Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
---
drivers/tee/optee/call.c | 86 +++++++++--------
drivers/tee/optee/core.c | 148 ++++++++++++++++++++----------
drivers/tee/optee/optee_private.h | 35 +++++--
drivers/tee/optee/rpc.c | 19 ++--
4 files changed, 182 insertions(+), 106 deletions(-)

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index 9d8f5a95e42f..00ecd794e59a 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2015-2021, Linaro Limited
*/
#include <linux/arm-smccc.h>
#include <linux/device.h>
@@ -118,20 +118,25 @@ static struct optee_session *find_session(struct optee_context_data *ctxdata,
/**
* optee_do_call_with_arg() - Do an SMC to OP-TEE in secure world
* @ctx: calling context
- * @parg: physical address of message to pass to secure world
+ * @arg: shared memory holding the message to pass to secure world
*
* Does and SMC to OP-TEE in secure world and handles eventual resulting
* Remote Procedure Calls (RPC) from OP-TEE.
*
* Returns return code from secure world, 0 is OK
*/
-u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
+int optee_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_call_waiter w;
struct optee_rpc_param param = { };
struct optee_call_ctx call_ctx = { };
- u32 ret;
+ phys_addr_t parg;
+ int rc;
+
+ rc = tee_shm_get_pa(arg, 0, &parg);
+ if (rc)
+ return rc;

param.a0 = OPTEE_SMC_CALL_WITH_ARG;
reg_pair_from_64(&param.a1, &param.a2, parg);
@@ -160,7 +165,7 @@ u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
param.a3 = res.a3;
optee_handle_rpc(ctx, &param, &call_ctx);
} else {
- ret = res.a0;
+ rc = res.a0;
break;
}
}
@@ -172,14 +177,12 @@ u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
*/
optee_cq_wait_final(&optee->call_queue, &w);

- return ret;
+ return rc;
}

static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,
- struct optee_msg_arg **msg_arg,
- phys_addr_t *msg_parg)
+ struct optee_msg_arg **msg_arg)
{
- int rc;
struct tee_shm *shm;
struct optee_msg_arg *ma;

@@ -190,22 +193,13 @@ static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,

ma = tee_shm_get_va(shm, 0);
if (IS_ERR(ma)) {
- rc = PTR_ERR(ma);
- goto out;
+ tee_shm_free(shm);
+ return (void *)ma;
}

- rc = tee_shm_get_pa(shm, 0, msg_parg);
- if (rc)
- goto out;
-
memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params));
ma->num_params = num_params;
*msg_arg = ma;
-out:
- if (rc) {
- tee_shm_free(shm);
- return ERR_PTR(rc);
- }

return shm;
}
@@ -214,16 +208,16 @@ int optee_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param)
{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_context_data *ctxdata = ctx->data;
int rc;
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
- phys_addr_t msg_parg;
struct optee_session *sess = NULL;
uuid_t client_uuid;

/* +2 for the meta parameters added below */
- shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg, &msg_parg);
+ shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);

@@ -247,7 +241,8 @@ int optee_open_session(struct tee_context *ctx,
goto out;
export_uuid(msg_arg->params[1].u.octets, &client_uuid);

- rc = optee_to_msg_param(msg_arg->params + 2, arg->num_params, param);
+ rc = optee->ops->to_msg_param(optee, msg_arg->params + 2,
+ arg->num_params, param);
if (rc)
goto out;

@@ -257,7 +252,7 @@ int optee_open_session(struct tee_context *ctx,
goto out;
}

- if (optee_do_call_with_arg(ctx, msg_parg)) {
+ if (optee->ops->do_call_with_arg(ctx, shm)) {
msg_arg->ret = TEEC_ERROR_COMMUNICATION;
msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
}
@@ -272,7 +267,8 @@ int optee_open_session(struct tee_context *ctx,
kfree(sess);
}

- if (optee_from_msg_param(param, arg->num_params, msg_arg->params + 2)) {
+ if (optee->ops->from_msg_param(optee, param, arg->num_params,
+ msg_arg->params + 2)) {
arg->ret = TEEC_ERROR_COMMUNICATION;
arg->ret_origin = TEEC_ORIGIN_COMMS;
/* Close session again to avoid leakage */
@@ -291,16 +287,16 @@ int optee_open_session(struct tee_context *ctx,
int optee_close_session_helper(struct tee_context *ctx, u32 session)
{
struct tee_shm *shm;
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_msg_arg *msg_arg;
- phys_addr_t msg_parg;

- shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
+ shm = get_msg_arg(ctx, 0, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);

msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
msg_arg->session = session;
- optee_do_call_with_arg(ctx, msg_parg);
+ optee->ops->do_call_with_arg(ctx, shm);

tee_shm_free(shm);

@@ -328,10 +324,10 @@ int optee_close_session(struct tee_context *ctx, u32 session)
int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
struct tee_param *param)
{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_context_data *ctxdata = ctx->data;
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
- phys_addr_t msg_parg;
struct optee_session *sess;
int rc;

@@ -342,7 +338,7 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
if (!sess)
return -EINVAL;

- shm = get_msg_arg(ctx, arg->num_params, &msg_arg, &msg_parg);
+ shm = get_msg_arg(ctx, arg->num_params, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
@@ -350,16 +346,18 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
msg_arg->session = arg->session;
msg_arg->cancel_id = arg->cancel_id;

- rc = optee_to_msg_param(msg_arg->params, arg->num_params, param);
+ rc = optee->ops->to_msg_param(optee, msg_arg->params, arg->num_params,
+ param);
if (rc)
goto out;

- if (optee_do_call_with_arg(ctx, msg_parg)) {
+ if (optee->ops->do_call_with_arg(ctx, shm)) {
msg_arg->ret = TEEC_ERROR_COMMUNICATION;
msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
}

- if (optee_from_msg_param(param, arg->num_params, msg_arg->params)) {
+ if (optee->ops->from_msg_param(optee, param, arg->num_params,
+ msg_arg->params)) {
msg_arg->ret = TEEC_ERROR_COMMUNICATION;
msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
}
@@ -373,10 +371,10 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,

int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_context_data *ctxdata = ctx->data;
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
- phys_addr_t msg_parg;
struct optee_session *sess;

/* Check that the session is valid */
@@ -386,14 +384,14 @@ int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
if (!sess)
return -EINVAL;

- shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
+ shm = get_msg_arg(ctx, 0, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);

msg_arg->cmd = OPTEE_MSG_CMD_CANCEL;
msg_arg->session = session;
msg_arg->cancel_id = cancel_id;
- optee_do_call_with_arg(ctx, msg_parg);
+ optee->ops->do_call_with_arg(ctx, shm);

tee_shm_free(shm);
return 0;
@@ -592,10 +590,10 @@ int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
struct page **pages, size_t num_pages,
unsigned long start)
{
- struct tee_shm *shm_arg = NULL;
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_msg_arg *msg_arg;
+ struct tee_shm *shm_arg;
u64 *pages_list;
- phys_addr_t msg_parg;
int rc;

if (!num_pages)
@@ -609,7 +607,7 @@ int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
if (!pages_list)
return -ENOMEM;

- shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg);
+ shm_arg = get_msg_arg(ctx, 1, &msg_arg);
if (IS_ERR(shm_arg)) {
rc = PTR_ERR(shm_arg);
goto out;
@@ -630,7 +628,7 @@ int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
msg_arg->params->u.tmem.buf_ptr = virt_to_phys(pages_list) |
(tee_shm_get_page_offset(shm) & (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));

- if (optee_do_call_with_arg(ctx, msg_parg) ||
+ if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
msg_arg->ret != TEEC_SUCCESS)
rc = -EINVAL;

@@ -642,12 +640,12 @@ int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,

int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
{
- struct tee_shm *shm_arg;
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_msg_arg *msg_arg;
- phys_addr_t msg_parg;
+ struct tee_shm *shm_arg;
int rc = 0;

- shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg);
+ shm_arg = get_msg_arg(ctx, 1, &msg_arg);
if (IS_ERR(shm_arg))
return PTR_ERR(shm_arg);

@@ -656,7 +654,7 @@ int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
msg_arg->params[0].u.rmem.shm_ref = (unsigned long)shm;

- if (optee_do_call_with_arg(ctx, msg_parg) ||
+ if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
msg_arg->ret != TEEC_SUCCESS)
rc = -EINVAL;
tee_shm_free(shm_arg);
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index 949223b214c3..f689f171a794 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2015-2021, Linaro Limited
*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -26,21 +26,87 @@

#define OPTEE_SHM_NUM_PRIV_PAGES CONFIG_OPTEE_SHM_NUM_PRIV_PAGES

+static void from_msg_param_value(struct tee_param *p, u32 attr,
+ const struct optee_msg_param *mp)
+{
+ p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
+ attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
+ p->u.value.a = mp->u.value.a;
+ p->u.value.b = mp->u.value.b;
+ p->u.value.c = mp->u.value.c;
+}
+
+static int from_msg_param_tmp_mem(struct tee_param *p, u32 attr,
+ const struct optee_msg_param *mp)
+{
+ struct tee_shm *shm;
+ phys_addr_t pa;
+ int rc;
+
+ p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
+ attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
+ p->u.memref.size = mp->u.tmem.size;
+ shm = (struct tee_shm *)(unsigned long)mp->u.tmem.shm_ref;
+ if (!shm) {
+ p->u.memref.shm_offs = 0;
+ p->u.memref.shm = NULL;
+ return 0;
+ }
+
+ rc = tee_shm_get_pa(shm, 0, &pa);
+ if (rc)
+ return rc;
+
+ p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
+ p->u.memref.shm = shm;
+
+ /* Check that the memref is covered by the shm object */
+ if (p->u.memref.size) {
+ size_t o = p->u.memref.shm_offs +
+ p->u.memref.size - 1;
+
+ rc = tee_shm_get_pa(shm, o, NULL);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+
+static void from_msg_param_reg_mem(struct tee_param *p, u32 attr,
+ const struct optee_msg_param *mp)
+{
+ struct tee_shm *shm;
+
+ p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
+ attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
+ p->u.memref.size = mp->u.rmem.size;
+ shm = (struct tee_shm *)(unsigned long)mp->u.rmem.shm_ref;
+
+ if (shm) {
+ p->u.memref.shm_offs = mp->u.rmem.offs;
+ p->u.memref.shm = shm;
+ } else {
+ p->u.memref.shm_offs = 0;
+ p->u.memref.shm = NULL;
+ }
+}
+
/**
* optee_from_msg_param() - convert from OPTEE_MSG parameters to
* struct tee_param
+ * @optee: main service struct
* @params: subsystem internal parameter representation
* @num_params: number of elements in the parameter arrays
* @msg_params: OPTEE_MSG parameters
* Returns 0 on success or <0 on failure
*/
-int optee_from_msg_param(struct tee_param *params, size_t num_params,
- const struct optee_msg_param *msg_params)
+static int optee_from_msg_param(struct optee *optee, struct tee_param *params,
+ size_t num_params,
+ const struct optee_msg_param *msg_params)
{
int rc;
size_t n;
- struct tee_shm *shm;
- phys_addr_t pa;

for (n = 0; n < num_params; n++) {
struct tee_param *p = params + n;
@@ -55,48 +121,19 @@ int optee_from_msg_param(struct tee_param *params, size_t num_params,
case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
- attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
- p->u.value.a = mp->u.value.a;
- p->u.value.b = mp->u.value.b;
- p->u.value.c = mp->u.value.c;
+ from_msg_param_value(p, attr, mp);
break;
case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
- attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
- p->u.memref.size = mp->u.tmem.size;
- shm = (struct tee_shm *)(unsigned long)
- mp->u.tmem.shm_ref;
- if (!shm) {
- p->u.memref.shm_offs = 0;
- p->u.memref.shm = NULL;
- break;
- }
- rc = tee_shm_get_pa(shm, 0, &pa);
+ rc = from_msg_param_tmp_mem(p, attr, mp);
if (rc)
return rc;
- p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
- p->u.memref.shm = shm;
break;
case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
- p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
- attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
- p->u.memref.size = mp->u.rmem.size;
- shm = (struct tee_shm *)(unsigned long)
- mp->u.rmem.shm_ref;
-
- if (!shm) {
- p->u.memref.shm_offs = 0;
- p->u.memref.shm = NULL;
- break;
- }
- p->u.memref.shm_offs = mp->u.rmem.offs;
- p->u.memref.shm = shm;
-
+ from_msg_param_reg_mem(p, attr, mp);
break;

default:
@@ -106,6 +143,16 @@ int optee_from_msg_param(struct tee_param *params, size_t num_params,
return 0;
}

+static void to_msg_param_value(struct optee_msg_param *mp,
+ const struct tee_param *p)
+{
+ mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
+ TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
+ mp->u.value.a = p->u.value.a;
+ mp->u.value.b = p->u.value.b;
+ mp->u.value.c = p->u.value.c;
+}
+
static int to_msg_param_tmp_mem(struct optee_msg_param *mp,
const struct tee_param *p)
{
@@ -148,13 +195,15 @@ static int to_msg_param_reg_mem(struct optee_msg_param *mp,

/**
* optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
+ * @optee: main service struct
* @msg_params: OPTEE_MSG parameters
* @num_params: number of elements in the parameter arrays
* @params: subsystem itnernal parameter representation
* Returns 0 on success or <0 on failure
*/
-int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
- const struct tee_param *params)
+static int optee_to_msg_param(struct optee *optee,
+ struct optee_msg_param *msg_params,
+ size_t num_params, const struct tee_param *params)
{
int rc;
size_t n;
@@ -171,11 +220,7 @@ int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
- mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
- TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
- mp->u.value.a = p->u.value.a;
- mp->u.value.b = p->u.value.b;
- mp->u.value.c = p->u.value.c;
+ to_msg_param_value(mp, p);
break;
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
@@ -301,7 +346,7 @@ static void optee_release_supp(struct tee_context *ctx)
optee_supp_release(&optee->supp);
}

-static const struct tee_driver_ops optee_ops = {
+static const struct tee_driver_ops optee_clnt_ops = {
.get_version = optee_get_version,
.open = optee_open,
.release = optee_release,
@@ -313,9 +358,9 @@ static const struct tee_driver_ops optee_ops = {
.shm_unregister = optee_shm_unregister,
};

-static const struct tee_desc optee_desc = {
+static const struct tee_desc optee_clnt_desc = {
.name = DRIVER_NAME "-clnt",
- .ops = &optee_ops,
+ .ops = &optee_clnt_ops,
.owner = THIS_MODULE,
};

@@ -336,6 +381,12 @@ static const struct tee_desc optee_supp_desc = {
.flags = TEE_DESC_PRIVILEGED,
};

+static const struct optee_ops optee_ops = {
+ .do_call_with_arg = optee_do_call_with_arg,
+ .to_msg_param = optee_to_msg_param,
+ .from_msg_param = optee_from_msg_param,
+};
+
static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
{
struct arm_smccc_res res;
@@ -637,10 +688,11 @@ static int optee_probe(struct platform_device *pdev)
goto err;
}

+ optee->ops = &optee_ops;
optee->invoke_fn = invoke_fn;
optee->sec_caps = sec_caps;

- teedev = tee_device_alloc(&optee_desc, NULL, pool, optee);
+ teedev = tee_device_alloc(&optee_clnt_desc, NULL, pool, optee);
if (IS_ERR(teedev)) {
rc = PTR_ERR(teedev);
goto err;
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index 2b63b796645e..c5741e96e967 100644
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -1,6 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
- * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2015-2021, Linaro Limited
*/

#ifndef OPTEE_PRIVATE_H
@@ -66,9 +66,34 @@ struct optee_supp {
struct completion reqs_c;
};

+struct optee;
+
+/**
+ * struct optee_ops - OP-TEE driver internal operations
+ * @do_call_with_arg: enters OP-TEE in secure world
+ * @to_msg_param: converts from struct tee_param to OPTEE_MSG parameters
+ * @from_msg_param: converts from OPTEE_MSG parameters to struct tee_param
+ *
+ * These OPs are only supposed to be used internally in the OP-TEE driver
+ * as a way of abstracting the different methogs of entering OP-TEE in
+ * secure world.
+ */
+struct optee_ops {
+ int (*do_call_with_arg)(struct tee_context *ctx,
+ struct tee_shm *shm_arg);
+ int (*to_msg_param)(struct optee *optee,
+ struct optee_msg_param *msg_params,
+ size_t num_params, const struct tee_param *params);
+ int (*from_msg_param)(struct optee *optee, struct tee_param *params,
+ size_t num_params,
+ const struct optee_msg_param *msg_params);
+};
+
/**
* struct optee - main service struct
* @supp_teedev: supplicant device
+ * @ops: internal callbacks for different ways to reach secure
+ * world
* @teedev: client device
* @invoke_fn: function to issue smc or hvc
* @call_queue: queue of threads waiting to call @invoke_fn
@@ -86,6 +111,7 @@ struct optee_supp {
struct optee {
struct tee_device *supp_teedev;
struct tee_device *teedev;
+ const struct optee_ops *ops;
optee_invoke_fn *invoke_fn;
struct optee_call_queue call_queue;
struct optee_wait_queue wait_queue;
@@ -148,7 +174,7 @@ int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params,
int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
struct tee_param *param);

-u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg);
+int optee_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg);
int optee_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param);
@@ -171,11 +197,6 @@ int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
unsigned long start);
int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm);

-int optee_from_msg_param(struct tee_param *params, size_t num_params,
- const struct optee_msg_param *msg_params);
-int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
- const struct tee_param *params);
-
u64 *optee_allocate_pages_list(size_t num_entries);
void optee_free_pages_list(void *array, size_t num_entries);
void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c
index 1849180b0278..39562fb6841e 100644
--- a/drivers/tee/optee/rpc.c
+++ b/drivers/tee/optee/rpc.c
@@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
- * Copyright (c) 2015-2016, Linaro Limited
+ * Copyright (c) 2015-2021, Linaro Limited
*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -55,6 +55,7 @@ static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
struct optee_msg_arg *arg)
{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
struct tee_param *params;
struct i2c_adapter *adapter;
struct i2c_msg msg = { };
@@ -79,7 +80,8 @@ static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
return;
}

- if (optee_from_msg_param(params, arg->num_params, arg->params))
+ if (optee->ops->from_msg_param(optee, params, arg->num_params,
+ arg->params))
goto bad;

for (i = 0; i < arg->num_params; i++) {
@@ -122,7 +124,8 @@ static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
arg->ret = TEEC_ERROR_COMMUNICATION;
} else {
params[3].u.value.a = msg.len;
- if (optee_to_msg_param(arg->params, arg->num_params, params))
+ if (optee->ops->to_msg_param(optee, arg->params,
+ arg->num_params, params))
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
else
arg->ret = TEEC_SUCCESS;
@@ -234,7 +237,7 @@ static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
}

-static void handle_rpc_supp_cmd(struct tee_context *ctx,
+static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee,
struct optee_msg_arg *arg)
{
struct tee_param *params;
@@ -248,14 +251,16 @@ static void handle_rpc_supp_cmd(struct tee_context *ctx,
return;
}

- if (optee_from_msg_param(params, arg->num_params, arg->params)) {
+ if (optee->ops->from_msg_param(optee, params, arg->num_params,
+ arg->params)) {
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
goto out;
}

arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);

- if (optee_to_msg_param(arg->params, arg->num_params, params))
+ if (optee->ops->to_msg_param(optee, arg->params, arg->num_params,
+ params))
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
out:
kfree(params);
@@ -480,7 +485,7 @@ static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
handle_rpc_func_cmd_i2c_transfer(ctx, arg);
break;
default:
- handle_rpc_supp_cmd(ctx, arg);
+ handle_rpc_supp_cmd(ctx, optee, arg);
}
}

--
2.31.1