[PATCH v3 2/6] tee: Add kernel client object invoke helper

[Harshal Dev <harshal.dev@oss.qualcomm.com>]

From: Amirreza Zarrabi <amirreza.zarrabi@oss.qualcomm.com>

Kernel clients can open a TEE context and invoke regular TA commands
through tee_client_invoke_func(). However, there is currently no
equivalent helper for invoking TEE objects.

Add tee_client_object_invoke_func() as a kernel client API for issuing
object invocation requests. The helper checks that the backend provides
object_invoke_func() before forwarding the request by setting the origin
as TEE_OBJECT_INVOKE_KERNEL. This allows TEE backends to support
privileged object-based calls from the kernel-space.

Co-developed-by: Harshal Dev <harshal.dev@oss.qualcomm.com>
Signed-off-by: Harshal Dev <harshal.dev@oss.qualcomm.com>
Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi@oss.qualcomm.com>
---
 drivers/tee/tee_core.c  | 12 ++++++++++++
 include/linux/tee_drv.h | 13 +++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index 30901390149c..a03a3d645dd1 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -1404,6 +1404,18 @@ int tee_client_invoke_func(struct tee_context *ctx,
 }
 EXPORT_SYMBOL_GPL(tee_client_invoke_func);
 
+int tee_client_object_invoke_func(struct tee_context *ctx,
+				  struct tee_ioctl_object_invoke_arg *arg,
+				  struct tee_param *param)
+{
+	if (!ctx->teedev->desc->ops->object_invoke_func)
+		return -EINVAL;
+
+	return ctx->teedev->desc->ops->object_invoke_func(ctx, arg, param,
+							  TEE_OBJECT_INVOKE_KERNEL);
+}
+EXPORT_SYMBOL_GPL(tee_client_object_invoke_func);
+
 int tee_client_cancel_req(struct tee_context *ctx,
 			  struct tee_ioctl_cancel_arg *arg)
 {
diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
index f3c5e106d853..369c87ad0205 100644
--- a/include/linux/tee_drv.h
+++ b/include/linux/tee_drv.h
@@ -283,6 +283,19 @@ int tee_client_invoke_func(struct tee_context *ctx,
 			   struct tee_ioctl_invoke_arg *arg,
 			   struct tee_param *param);
 
+/**
+ * tee_client_object_invoke_func() - Invoke a TEE object from kernel space
+ * @ctx:    TEE Context
+ * @arg:    Invoke arguments, see description of
+ *          struct tee_ioctl_object_invoke_arg
+ * @param:  Parameters for the object invocation
+ *
+ * Return: On success, returns 0; on failure, returns < 0.
+ */
+int tee_client_object_invoke_func(struct tee_context *ctx,
+				  struct tee_ioctl_object_invoke_arg *arg,
+				  struct tee_param *param);
+
 /**
  * tee_client_cancel_req() - Request cancellation of the previous open-session
  * or invoke-command operations in a Trusted Application

-- 
2.34.1