1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2019 Linaro Ltd.
4 */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8 #include <linux/kernel.h>
9 #include <linux/slab.h>
10 #include <linux/tee_drv.h>
11 #include <linux/uuid.h>
12 #include "optee_private.h"
13
optee_ctx_match(struct tee_ioctl_version_data * ver,const void * data)14 static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
15 {
16 if (ver->impl_id == TEE_IMPL_ID_OPTEE)
17 return 1;
18 else
19 return 0;
20 }
21
get_devices(struct tee_context * ctx,u32 session,struct tee_shm * device_shm,u32 * shm_size,u32 func)22 static int get_devices(struct tee_context *ctx, u32 session,
23 struct tee_shm *device_shm, u32 *shm_size,
24 u32 func)
25 {
26 int ret = 0;
27 struct tee_ioctl_invoke_arg inv_arg;
28 struct tee_param param[4];
29
30 memset(&inv_arg, 0, sizeof(inv_arg));
31 memset(¶m, 0, sizeof(param));
32
33 inv_arg.func = func;
34 inv_arg.session = session;
35 inv_arg.num_params = 4;
36
37 /* Fill invoke cmd params */
38 param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT;
39 param[0].u.memref.shm = device_shm;
40 param[0].u.memref.size = *shm_size;
41 param[0].u.memref.shm_offs = 0;
42
43 ret = tee_client_invoke_func(ctx, &inv_arg, param);
44 if ((ret < 0) || ((inv_arg.ret != TEEC_SUCCESS) &&
45 (inv_arg.ret != TEEC_ERROR_SHORT_BUFFER))) {
46 pr_err("PTA_CMD_GET_DEVICES invoke function err: %x\n",
47 inv_arg.ret);
48 return -EINVAL;
49 }
50
51 *shm_size = param[0].u.memref.size;
52
53 return 0;
54 }
55
optee_register_device(const uuid_t * device_uuid)56 static int optee_register_device(const uuid_t *device_uuid)
57 {
58 struct tee_client_device *optee_device = NULL;
59 int rc;
60
61 optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
62 if (!optee_device)
63 return -ENOMEM;
64
65 optee_device->dev.bus = &tee_bus_type;
66 if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
67 kfree(optee_device);
68 return -ENOMEM;
69 }
70 uuid_copy(&optee_device->id.uuid, device_uuid);
71
72 rc = device_register(&optee_device->dev);
73 if (rc) {
74 pr_err("device registration failed, err: %d\n", rc);
75 kfree(optee_device);
76 }
77
78 return rc;
79 }
80
__optee_enumerate_devices(u32 func)81 static int __optee_enumerate_devices(u32 func)
82 {
83 const uuid_t pta_uuid =
84 UUID_INIT(0x7011a688, 0xddde, 0x4053,
85 0xa5, 0xa9, 0x7b, 0x3c, 0x4d, 0xdf, 0x13, 0xb8);
86 struct tee_ioctl_open_session_arg sess_arg;
87 struct tee_shm *device_shm = NULL;
88 const uuid_t *device_uuid = NULL;
89 struct tee_context *ctx = NULL;
90 u32 shm_size = 0, idx, num_devices = 0;
91 int rc;
92
93 memset(&sess_arg, 0, sizeof(sess_arg));
94
95 /* Open context with OP-TEE driver */
96 ctx = tee_client_open_context(NULL, optee_ctx_match, NULL, NULL);
97 if (IS_ERR(ctx))
98 return -ENODEV;
99
100 /* Open session with device enumeration pseudo TA */
101 export_uuid(sess_arg.uuid, &pta_uuid);
102 sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
103 sess_arg.num_params = 0;
104
105 rc = tee_client_open_session(ctx, &sess_arg, NULL);
106 if ((rc < 0) || (sess_arg.ret != TEEC_SUCCESS)) {
107 /* Device enumeration pseudo TA not found */
108 rc = 0;
109 goto out_ctx;
110 }
111
112 rc = get_devices(ctx, sess_arg.session, NULL, &shm_size, func);
113 if (rc < 0 || !shm_size)
114 goto out_sess;
115
116 device_shm = tee_shm_alloc(ctx, shm_size,
117 TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
118 if (IS_ERR(device_shm)) {
119 pr_err("tee_shm_alloc failed\n");
120 rc = PTR_ERR(device_shm);
121 goto out_sess;
122 }
123
124 rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size, func);
125 if (rc < 0)
126 goto out_shm;
127
128 device_uuid = tee_shm_get_va(device_shm, 0);
129 if (IS_ERR(device_uuid)) {
130 pr_err("tee_shm_get_va failed\n");
131 rc = PTR_ERR(device_uuid);
132 goto out_shm;
133 }
134
135 num_devices = shm_size / sizeof(uuid_t);
136
137 for (idx = 0; idx < num_devices; idx++) {
138 rc = optee_register_device(&device_uuid[idx]);
139 if (rc)
140 goto out_shm;
141 }
142
143 out_shm:
144 tee_shm_free(device_shm);
145 out_sess:
146 tee_client_close_session(ctx, sess_arg.session);
147 out_ctx:
148 tee_client_close_context(ctx);
149
150 return rc;
151 }
152
optee_enumerate_devices(u32 func)153 int optee_enumerate_devices(u32 func)
154 {
155 return __optee_enumerate_devices(func);
156 }
157