Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Sumit Garg <sumit.garg@oss.qualcomm.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org>
Tested-by: Harshal Dev <quic_hdev@quicinc.com>
Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi@oss.qualcomm.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
authored by
Amirreza Zarrabi
and committed by
Jens Wiklander
0f7bfdcb
d6e29083
+81
-5
+1
drivers/tee/qcomtee/Makefile
+1
drivers/tee/qcomtee/Makefile
+14
-5
drivers/tee/qcomtee/core.c
+14
-5
drivers/tee/qcomtee/core.c
···
31
31
}
32
32
33
33
/*
34
-
* QTEE expects IDs with the QCOMTEE_MSG_OBJECT_NS_BIT set for objects
35
-
* of the QCOMTEE_OBJECT_TYPE_CB type.
34
+
* QTEE expects IDs with QCOMTEE_MSG_OBJECT_NS_BIT set for objects of
35
+
* QCOMTEE_OBJECT_TYPE_CB type. The first ID with QCOMTEE_MSG_OBJECT_NS_BIT
36
+
* set is reserved for the primordial object.
36
37
*/
37
-
#define QCOMTEE_OBJECT_ID_START (QCOMTEE_MSG_OBJECT_NS_BIT + 1)
38
+
#define QCOMTEE_OBJECT_PRIMORDIAL (QCOMTEE_MSG_OBJECT_NS_BIT)
39
+
#define QCOMTEE_OBJECT_ID_START (QCOMTEE_OBJECT_PRIMORDIAL + 1)
38
40
#define QCOMTEE_OBJECT_ID_END (U32_MAX)
39
41
40
42
#define QCOMTEE_OBJECT_SET(p, type, ...) \
···
159
157
*/
160
158
int qcomtee_object_get(struct qcomtee_object *object)
161
159
{
162
-
if (object != NULL_QCOMTEE_OBJECT && object != ROOT_QCOMTEE_OBJECT)
160
+
if (object != &qcomtee_primordial_object &&
161
+
object != NULL_QCOMTEE_OBJECT &&
162
+
object != ROOT_QCOMTEE_OBJECT)
163
163
return kref_get_unless_zero(&object->refcount);
164
164
165
165
return 0;
···
173
169
*/
174
170
void qcomtee_object_put(struct qcomtee_object *object)
175
171
{
176
-
if (object != NULL_QCOMTEE_OBJECT && object != ROOT_QCOMTEE_OBJECT)
172
+
if (object != &qcomtee_primordial_object &&
173
+
object != NULL_QCOMTEE_OBJECT &&
174
+
object != ROOT_QCOMTEE_OBJECT)
177
175
kref_put(&object->refcount, qcomtee_object_release);
178
176
}
179
177
···
266
260
{
267
261
struct qcomtee *qcomtee = tee_get_drvdata(oic->ctx->teedev);
268
262
struct qcomtee_object *object;
263
+
264
+
if (object_id == QCOMTEE_OBJECT_PRIMORDIAL)
265
+
return &qcomtee_primordial_object;
269
266
270
267
guard(rcu)();
271
268
object = xa_load(&qcomtee->xa_local_objects, object_id);
+63
drivers/tee/qcomtee/primordial_obj.c
+63
drivers/tee/qcomtee/primordial_obj.c
···
1
+
// SPDX-License-Identifier: GPL-2.0-only
2
+
/*
3
+
* Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
4
+
*/
5
+
6
+
#include <linux/delay.h>
7
+
#include "qcomtee.h"
8
+
9
+
/**
10
+
* DOC: Primordial Object
11
+
*
12
+
* After boot, the kernel provides a static object of type
13
+
* %QCOMTEE_OBJECT_TYPE_CB called the primordial object. This object is used
14
+
* for native kernel services or privileged operations.
15
+
*
16
+
* We support:
17
+
* - %QCOMTEE_OBJECT_OP_YIELD to yield by the thread running in QTEE.
18
+
* - %QCOMTEE_OBJECT_OP_SLEEP to wait for a period of time.
19
+
*/
20
+
21
+
#define QCOMTEE_OBJECT_OP_YIELD 1
22
+
#define QCOMTEE_OBJECT_OP_SLEEP 2
23
+
24
+
static int
25
+
qcomtee_primordial_obj_dispatch(struct qcomtee_object_invoke_ctx *oic,
26
+
struct qcomtee_object *primordial_object_unused,
27
+
u32 op, struct qcomtee_arg *args)
28
+
{
29
+
int err = 0;
30
+
31
+
switch (op) {
32
+
case QCOMTEE_OBJECT_OP_YIELD:
33
+
cond_resched();
34
+
/* No output object. */
35
+
oic->data = NULL;
36
+
break;
37
+
case QCOMTEE_OBJECT_OP_SLEEP:
38
+
/* Check message format matched QCOMTEE_OBJECT_OP_SLEEP op. */
39
+
if (qcomtee_args_len(args) != 1 ||
40
+
args[0].type != QCOMTEE_ARG_TYPE_IB ||
41
+
args[0].b.size < sizeof(u32))
42
+
return -EINVAL;
43
+
44
+
msleep(*(u32 *)(args[0].b.addr));
45
+
/* No output object. */
46
+
oic->data = NULL;
47
+
break;
48
+
default:
49
+
err = -EINVAL;
50
+
}
51
+
52
+
return err;
53
+
}
54
+
55
+
static struct qcomtee_object_operations qcomtee_primordial_obj_ops = {
56
+
.dispatch = qcomtee_primordial_obj_dispatch,
57
+
};
58
+
59
+
struct qcomtee_object qcomtee_primordial_object = {
60
+
.name = "primordial",
61
+
.object_type = QCOMTEE_OBJECT_TYPE_CB,
62
+
.ops = &qcomtee_primordial_obj_ops
63
+
};