1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2015-2021, Linaro Limited
4 * Copyright (c) 2016, EPAM Systems
5 */
6
7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9#include <linux/crash_dump.h>
10#include <linux/errno.h>
11#include <linux/io.h>
12#include <linux/mm.h>
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/string.h>
16#include <linux/tee_drv.h>
17#include <linux/types.h>
18#include "optee_private.h"
19
20int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
21 size_t size, size_t align,
22 int (*shm_register)(struct tee_context *ctx,
23 struct tee_shm *shm,
24 struct page **pages,
25 size_t num_pages,
26 unsigned long start))
27{
28 size_t nr_pages = roundup(size, PAGE_SIZE) / PAGE_SIZE;
29 struct page **pages;
30 unsigned int i;
31 int rc = 0;
32
33 /*
34 * Ignore alignment since this is already going to be page aligned
35 * and there's no need for any larger alignment.
36 */
37 shm->kaddr = alloc_pages_exact(size: nr_pages * PAGE_SIZE,
38 GFP_KERNEL | __GFP_ZERO);
39 if (!shm->kaddr)
40 return -ENOMEM;
41
42 shm->paddr = virt_to_phys(address: shm->kaddr);
43 shm->size = nr_pages * PAGE_SIZE;
44
45 pages = kcalloc(n: nr_pages, size: sizeof(*pages), GFP_KERNEL);
46 if (!pages) {
47 rc = -ENOMEM;
48 goto err;
49 }
50
51 for (i = 0; i < nr_pages; i++)
52 pages[i] = virt_to_page((u8 *)shm->kaddr + i * PAGE_SIZE);
53
54 shm->pages = pages;
55 shm->num_pages = nr_pages;
56
57 if (shm_register) {
58 rc = shm_register(shm->ctx, shm, pages, nr_pages,
59 (unsigned long)shm->kaddr);
60 if (rc)
61 goto err;
62 }
63
64 return 0;
65err:
66 free_pages_exact(virt: shm->kaddr, size: shm->size);
67 shm->kaddr = NULL;
68 return rc;
69}
70
71void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
72 int (*shm_unregister)(struct tee_context *ctx,
73 struct tee_shm *shm))
74{
75 if (shm_unregister)
76 shm_unregister(shm->ctx, shm);
77 free_pages_exact(virt: shm->kaddr, size: shm->size);
78 shm->kaddr = NULL;
79 kfree(objp: shm->pages);
80 shm->pages = NULL;
81}
82
83static void optee_bus_scan(struct work_struct *work)
84{
85 WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
86}
87
88int optee_open(struct tee_context *ctx, bool cap_memref_null)
89{
90 struct optee_context_data *ctxdata;
91 struct tee_device *teedev = ctx->teedev;
92 struct optee *optee = tee_get_drvdata(teedev);
93
94 ctxdata = kzalloc(size: sizeof(*ctxdata), GFP_KERNEL);
95 if (!ctxdata)
96 return -ENOMEM;
97
98 if (teedev == optee->supp_teedev) {
99 bool busy = true;
100
101 mutex_lock(&optee->supp.mutex);
102 if (!optee->supp.ctx) {
103 busy = false;
104 optee->supp.ctx = ctx;
105 }
106 mutex_unlock(lock: &optee->supp.mutex);
107 if (busy) {
108 kfree(objp: ctxdata);
109 return -EBUSY;
110 }
111
112 if (!optee->scan_bus_done) {
113 INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
114 schedule_work(work: &optee->scan_bus_work);
115 optee->scan_bus_done = true;
116 }
117 }
118 mutex_init(&ctxdata->mutex);
119 INIT_LIST_HEAD(list: &ctxdata->sess_list);
120
121 ctx->cap_memref_null = cap_memref_null;
122 ctx->data = ctxdata;
123 return 0;
124}
125
126static void optee_release_helper(struct tee_context *ctx,
127 int (*close_session)(struct tee_context *ctx,
128 u32 session,
129 bool system_thread))
130{
131 struct optee_context_data *ctxdata = ctx->data;
132 struct optee_session *sess;
133 struct optee_session *sess_tmp;
134
135 if (!ctxdata)
136 return;
137
138 list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
139 list_node) {
140 list_del(entry: &sess->list_node);
141 close_session(ctx, sess->session_id, sess->use_sys_thread);
142 kfree(objp: sess);
143 }
144 kfree(objp: ctxdata);
145 ctx->data = NULL;
146}
147
148void optee_release(struct tee_context *ctx)
149{
150 optee_release_helper(ctx, close_session: optee_close_session_helper);
151}
152
153void optee_release_supp(struct tee_context *ctx)
154{
155 struct optee *optee = tee_get_drvdata(teedev: ctx->teedev);
156
157 optee_release_helper(ctx, close_session: optee_close_session_helper);
158
159 optee_supp_release(supp: &optee->supp);
160}
161
162void optee_remove_common(struct optee *optee)
163{
164 /* Unregister OP-TEE specific client devices on TEE bus */
165 optee_unregister_devices();
166
167 optee_notif_uninit(optee);
168 optee_shm_arg_cache_uninit(optee);
169 teedev_close_context(ctx: optee->ctx);
170 /*
171 * The two devices have to be unregistered before we can free the
172 * other resources.
173 */
174 tee_device_unregister(teedev: optee->supp_teedev);
175 tee_device_unregister(teedev: optee->teedev);
176
177 tee_shm_pool_free(pool: optee->pool);
178 optee_supp_uninit(supp: &optee->supp);
179 mutex_destroy(lock: &optee->call_queue.mutex);
180}
181
182static int smc_abi_rc;
183static int ffa_abi_rc;
184
185static int __init optee_core_init(void)
186{
187 /*
188 * The kernel may have crashed at the same time that all available
189 * secure world threads were suspended and we cannot reschedule the
190 * suspended threads without access to the crashed kernel's wait_queue.
191 * Therefore, we cannot reliably initialize the OP-TEE driver in the
192 * kdump kernel.
193 */
194 if (is_kdump_kernel())
195 return -ENODEV;
196
197 smc_abi_rc = optee_smc_abi_register();
198 ffa_abi_rc = optee_ffa_abi_register();
199
200 /* If both failed there's no point with this module */
201 if (smc_abi_rc && ffa_abi_rc)
202 return smc_abi_rc;
203 return 0;
204}
205module_init(optee_core_init);
206
207static void __exit optee_core_exit(void)
208{
209 if (!smc_abi_rc)
210 optee_smc_abi_unregister();
211 if (!ffa_abi_rc)
212 optee_ffa_abi_unregister();
213}
214module_exit(optee_core_exit);
215
216MODULE_AUTHOR("Linaro");
217MODULE_DESCRIPTION("OP-TEE driver");
218MODULE_VERSION("1.0");
219MODULE_LICENSE("GPL v2");
220MODULE_ALIAS("platform:optee");
221

source code of linux/drivers/tee/optee/core.c