Commit 0f7bfdcb authored by Amirreza Zarrabi's avatar Amirreza Zarrabi Committed by Jens Wiklander
Browse files

tee: qcom: add primordial object 



After booting, the kernel provides a static object known as the
primordial object. This object is utilized by QTEE for native
kernel services such as yield or privileged operations.

Acked-by: default avatarSumit Garg <sumit.garg@oss.qualcomm.com>
Tested-by: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Tested-by: default avatarHarshal Dev <quic_hdev@quicinc.com>
Signed-off-by: default avatarAmirreza Zarrabi <amirreza.zarrabi@oss.qualcomm.com>
Signed-off-by: default avatarJens Wiklander <jens.wiklander@linaro.org>
parent d6e29083

drivers/tee/qcomtee/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -3,5 +3,6 @@ obj-$(CONFIG_QCOMTEE) += qcomtee.o 
qcomtee-objs += async.o

qcomtee-objs += call.o

qcomtee-objs += core.o

qcomtee-objs += primordial_obj.o

qcomtee-objs += shm.o

qcomtee-objs += user_obj.o

drivers/tee/qcomtee/core.c

+14 −5
Original line number Diff line number Diff line
@@ -31,10 +31,12 @@ int qcomtee_next_arg_type(struct qcomtee_arg *u, int i, 
}



/*

 * QTEE expects IDs with the QCOMTEE_MSG_OBJECT_NS_BIT set for objects

 * of the QCOMTEE_OBJECT_TYPE_CB type.

 * QTEE expects IDs with QCOMTEE_MSG_OBJECT_NS_BIT set for objects of

 * QCOMTEE_OBJECT_TYPE_CB type. The first ID with QCOMTEE_MSG_OBJECT_NS_BIT

 * set is reserved for the primordial object.

 */

#define QCOMTEE_OBJECT_ID_START (QCOMTEE_MSG_OBJECT_NS_BIT + 1)

#define QCOMTEE_OBJECT_PRIMORDIAL (QCOMTEE_MSG_OBJECT_NS_BIT)

#define QCOMTEE_OBJECT_ID_START (QCOMTEE_OBJECT_PRIMORDIAL + 1)

#define QCOMTEE_OBJECT_ID_END (U32_MAX)



#define QCOMTEE_OBJECT_SET(p, type, ...) \
@@ -157,7 +159,9 @@ static void qcomtee_object_release(struct kref *refcount) 
 */

int qcomtee_object_get(struct qcomtee_object *object)

{

	if (object != NULL_QCOMTEE_OBJECT && object != ROOT_QCOMTEE_OBJECT)

	if (object != &qcomtee_primordial_object &&

	    object != NULL_QCOMTEE_OBJECT &&

	    object != ROOT_QCOMTEE_OBJECT)

		return kref_get_unless_zero(&object->refcount);



	return 0;
@@ -169,7 +173,9 @@ int qcomtee_object_get(struct qcomtee_object *object) 
 */

void qcomtee_object_put(struct qcomtee_object *object)

{

	if (object != NULL_QCOMTEE_OBJECT && object != ROOT_QCOMTEE_OBJECT)

	if (object != &qcomtee_primordial_object &&

	    object != NULL_QCOMTEE_OBJECT &&

	    object != ROOT_QCOMTEE_OBJECT)

		kref_put(&object->refcount, qcomtee_object_release);

}
@@ -261,6 +267,9 @@ qcomtee_local_object_get(struct qcomtee_object_invoke_ctx *oic, 
	struct qcomtee *qcomtee = tee_get_drvdata(oic->ctx->teedev);

	struct qcomtee_object *object;



	if (object_id == QCOMTEE_OBJECT_PRIMORDIAL)

		return &qcomtee_primordial_object;



	guard(rcu)();

	object = xa_load(&qcomtee->xa_local_objects, object_id);

	/* It already checks for %NULL_QCOMTEE_OBJECT. */

drivers/tee/qcomtee/primordial_obj.c

0 → 100644
+63 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.

 */



#include <linux/delay.h>

#include "qcomtee.h"



/**

 * DOC: Primordial Object

 *

 * After boot, the kernel provides a static object of type

 * %QCOMTEE_OBJECT_TYPE_CB called the primordial object. This object is used

 * for native kernel services or privileged operations.

 *

 * We support:

 *  - %QCOMTEE_OBJECT_OP_YIELD to yield by the thread running in QTEE.

 *  - %QCOMTEE_OBJECT_OP_SLEEP to wait for a period of time.

 */



#define QCOMTEE_OBJECT_OP_YIELD 1

#define QCOMTEE_OBJECT_OP_SLEEP 2



static int

qcomtee_primordial_obj_dispatch(struct qcomtee_object_invoke_ctx *oic,

				struct qcomtee_object *primordial_object_unused,

				u32 op, struct qcomtee_arg *args)

{

	int err = 0;



	switch (op) {

	case QCOMTEE_OBJECT_OP_YIELD:

		cond_resched();

		/* No output object. */

		oic->data = NULL;

		break;

	case QCOMTEE_OBJECT_OP_SLEEP:

		/* Check message format matched QCOMTEE_OBJECT_OP_SLEEP op. */

		if (qcomtee_args_len(args) != 1 ||

		    args[0].type != QCOMTEE_ARG_TYPE_IB ||

		    args[0].b.size < sizeof(u32))

			return -EINVAL;



		msleep(*(u32 *)(args[0].b.addr));

		/* No output object. */

		oic->data = NULL;

		break;

	default:

		err = -EINVAL;

	}



	return err;

}



static struct qcomtee_object_operations qcomtee_primordial_obj_ops = {

	.dispatch = qcomtee_primordial_obj_dispatch,

};



struct qcomtee_object qcomtee_primordial_object = {

	.name = "primordial",

	.object_type = QCOMTEE_OBJECT_TYPE_CB,

	.ops = &qcomtee_primordial_obj_ops

};

drivers/tee/qcomtee/qcomtee.h

+3 −0
Original line number Diff line number Diff line
@@ -140,4 +140,7 @@ int qcomtee_user_object_submit(struct tee_context *ctx, 
			       struct tee_param *params, int num_params,

			       int req_id, int errno);



/* (2) Primordial Object. */

extern struct qcomtee_object qcomtee_primordial_object;



#endif /* QCOMTEE_H */