1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015-2021, Linaro Limited
* Copyright (c) 2016, EPAM Systems
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/crash_dump.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tee_drv.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include "optee_private.h"
int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm, size_t size,
int (*shm_register)(struct tee_context *ctx,
struct tee_shm *shm,
struct page **pages,
size_t num_pages,
unsigned long start))
{
unsigned int order = get_order(size);
struct page *page;
int rc = 0;
page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!page)
return -ENOMEM;
shm->kaddr = page_address(page);
shm->paddr = page_to_phys(page);
shm->size = PAGE_SIZE << order;
if (shm_register) {
unsigned int nr_pages = 1 << order, i;
struct page **pages;
pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
if (!pages) {
rc = -ENOMEM;
goto err;
}
for (i = 0; i < nr_pages; i++) {
pages[i] = page;
page++;
}
shm->flags |= TEE_SHM_REGISTER;
rc = shm_register(shm->ctx, shm, pages, nr_pages,
(unsigned long)shm->kaddr);
kfree(pages);
if (rc)
goto err;
}
return 0;
err:
__free_pages(page, order);
return rc;
}
static void optee_bus_scan(struct work_struct *work)
{
WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
}
int optee_open(struct tee_context *ctx, bool cap_memref_null)
{
struct optee_context_data *ctxdata;
struct tee_device *teedev = ctx->teedev;
struct optee *optee = tee_get_drvdata(teedev);
ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
if (!ctxdata)
return -ENOMEM;
if (teedev == optee->supp_teedev) {
bool busy = true;
mutex_lock(&optee->supp.mutex);
if (!optee->supp.ctx) {
busy = false;
optee->supp.ctx = ctx;
}
mutex_unlock(&optee->supp.mutex);
if (busy) {
kfree(ctxdata);
return -EBUSY;
}
if (!optee->scan_bus_done) {
INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
optee->scan_bus_wq = create_workqueue("optee_bus_scan");
if (!optee->scan_bus_wq) {
kfree(ctxdata);
return -ECHILD;
}
queue_work(optee->scan_bus_wq, &optee->scan_bus_work);
optee->scan_bus_done = true;
}
}
mutex_init(&ctxdata->mutex);
INIT_LIST_HEAD(&ctxdata->sess_list);
ctx->cap_memref_null = cap_memref_null;
ctx->data = ctxdata;
return 0;
}
static void optee_release_helper(struct tee_context *ctx,
int (*close_session)(struct tee_context *ctx,
u32 session))
{
struct optee_context_data *ctxdata = ctx->data;
struct optee_session *sess;
struct optee_session *sess_tmp;
if (!ctxdata)
return;
list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
list_node) {
list_del(&sess->list_node);
close_session(ctx, sess->session_id);
kfree(sess);
}
kfree(ctxdata);
ctx->data = NULL;
}
void optee_release(struct tee_context *ctx)
{
optee_release_helper(ctx, optee_close_session_helper);
}
void optee_release_supp(struct tee_context *ctx)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
optee_release_helper(ctx, optee_close_session_helper);
if (optee->scan_bus_wq) {
destroy_workqueue(optee->scan_bus_wq);
optee->scan_bus_wq = NULL;
}
optee_supp_release(&optee->supp);
}
void optee_remove_common(struct optee *optee)
{
/* Unregister OP-TEE specific client devices on TEE bus */
optee_unregister_devices();
/*
* The two devices have to be unregistered before we can free the
* other resources.
*/
tee_device_unregister(optee->supp_teedev);
tee_device_unregister(optee->teedev);
tee_shm_pool_free(optee->pool);
optee_wait_queue_exit(&optee->wait_queue);
optee_supp_uninit(&optee->supp);
mutex_destroy(&optee->call_queue.mutex);
}
static int smc_abi_rc;
static int ffa_abi_rc;
static int optee_core_init(void)
{
/*
* The kernel may have crashed at the same time that all available
* secure world threads were suspended and we cannot reschedule the
* suspended threads without access to the crashed kernel's wait_queue.
* Therefore, we cannot reliably initialize the OP-TEE driver in the
* kdump kernel.
*/
if (is_kdump_kernel())
return -ENODEV;
smc_abi_rc = optee_smc_abi_register();
ffa_abi_rc = optee_ffa_abi_register();
/* If both failed there's no point with this module */
if (smc_abi_rc && ffa_abi_rc)
return smc_abi_rc;
return 0;
}
module_init(optee_core_init);
static void optee_core_exit(void)
{
if (!smc_abi_rc)
optee_smc_abi_unregister();
if (!ffa_abi_rc)
optee_ffa_abi_unregister();
}
module_exit(optee_core_exit);
MODULE_AUTHOR("Linaro");
MODULE_DESCRIPTION("OP-TEE driver");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:optee");
|
