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: Sumit Garg sumit.garg@oss.qualcomm.com Tested-by: Neil Armstrong neil.armstrong@linaro.org Signed-off-by: Amirreza Zarrabi amirreza.zarrabi@oss.qualcomm.com --- drivers/tee/qcomtee/Makefile | 1 + drivers/tee/qcomtee/core.c | 19 ++++++++--- drivers/tee/qcomtee/primordial_obj.c | 66 ++++++++++++++++++++++++++++++++++++ drivers/tee/qcomtee/qcomtee.h | 3 ++ 4 files changed, 84 insertions(+), 5 deletions(-)
diff --git a/drivers/tee/qcomtee/Makefile b/drivers/tee/qcomtee/Makefile index 600af2b8f1c1..78f8e899d143 100644 --- a/drivers/tee/qcomtee/Makefile +++ b/drivers/tee/qcomtee/Makefile @@ -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 diff --git a/drivers/tee/qcomtee/core.c b/drivers/tee/qcomtee/core.c index 0e7f3ab8242a..a949c41dc687 100644 --- a/drivers/tee/qcomtee/core.c +++ b/drivers/tee/qcomtee/core.c @@ -30,10 +30,12 @@ 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, ...) \ @@ -156,7 +158,9 @@ 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; @@ -168,7 +172,9 @@ 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); }
@@ -260,6 +266,9 @@ 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. */ diff --git a/drivers/tee/qcomtee/primordial_obj.c b/drivers/tee/qcomtee/primordial_obj.c new file mode 100644 index 000000000000..025346cde835 --- /dev/null +++ b/drivers/tee/qcomtee/primordial_obj.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#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 +}; diff --git a/drivers/tee/qcomtee/qcomtee.h b/drivers/tee/qcomtee/qcomtee.h index a69d7c091637..f3a5c4658792 100644 --- a/drivers/tee/qcomtee/qcomtee.h +++ b/drivers/tee/qcomtee/qcomtee.h @@ -221,4 +221,7 @@ 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 */