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 <linux/workqueue.h>
19 #include "optee_private.h"
20
optee_pool_op_alloc_helper(struct tee_shm_pool * pool,struct tee_shm * shm,size_t size,size_t align,int (* shm_register)(struct tee_context * ctx,struct tee_shm * shm,struct page ** pages,size_t num_pages,unsigned long start))21 int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
22 size_t size, size_t align,
23 int (*shm_register)(struct tee_context *ctx,
24 struct tee_shm *shm,
25 struct page **pages,
26 size_t num_pages,
27 unsigned long start))
28 {
29 unsigned int order = get_order(size);
30 struct page *page;
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 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
38 if (!page)
39 return -ENOMEM;
40
41 shm->kaddr = page_address(page);
42 shm->paddr = page_to_phys(page);
43 shm->size = PAGE_SIZE << order;
44
45 if (shm_register) {
46 unsigned int nr_pages = 1 << order, i;
47 struct page **pages;
48
49 pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
50 if (!pages) {
51 rc = -ENOMEM;
52 goto err;
53 }
54
55 for (i = 0; i < nr_pages; i++)
56 pages[i] = page + i;
57
58 rc = shm_register(shm->ctx, shm, pages, nr_pages,
59 (unsigned long)shm->kaddr);
60 kfree(pages);
61 if (rc)
62 goto err;
63 }
64
65 return 0;
66
67 err:
68 free_pages((unsigned long)shm->kaddr, order);
69 return rc;
70 }
71
optee_pool_op_free_helper(struct tee_shm_pool * pool,struct tee_shm * shm,int (* shm_unregister)(struct tee_context * ctx,struct tee_shm * shm))72 void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
73 int (*shm_unregister)(struct tee_context *ctx,
74 struct tee_shm *shm))
75 {
76 if (shm_unregister)
77 shm_unregister(shm->ctx, shm);
78 free_pages((unsigned long)shm->kaddr, get_order(shm->size));
79 shm->kaddr = NULL;
80 }
81
optee_bus_scan(struct work_struct * work)82 static void optee_bus_scan(struct work_struct *work)
83 {
84 WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
85 }
86
optee_open(struct tee_context * ctx,bool cap_memref_null)87 int optee_open(struct tee_context *ctx, bool cap_memref_null)
88 {
89 struct optee_context_data *ctxdata;
90 struct tee_device *teedev = ctx->teedev;
91 struct optee *optee = tee_get_drvdata(teedev);
92
93 ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
94 if (!ctxdata)
95 return -ENOMEM;
96
97 if (teedev == optee->supp_teedev) {
98 bool busy = true;
99
100 mutex_lock(&optee->supp.mutex);
101 if (!optee->supp.ctx) {
102 busy = false;
103 optee->supp.ctx = ctx;
104 }
105 mutex_unlock(&optee->supp.mutex);
106 if (busy) {
107 kfree(ctxdata);
108 return -EBUSY;
109 }
110
111 if (!optee->scan_bus_done) {
112 INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
113 optee->scan_bus_wq = create_workqueue("optee_bus_scan");
114 if (!optee->scan_bus_wq) {
115 kfree(ctxdata);
116 return -ECHILD;
117 }
118 queue_work(optee->scan_bus_wq, &optee->scan_bus_work);
119 optee->scan_bus_done = true;
120 }
121 }
122 mutex_init(&ctxdata->mutex);
123 INIT_LIST_HEAD(&ctxdata->sess_list);
124
125 ctx->cap_memref_null = cap_memref_null;
126 ctx->data = ctxdata;
127 return 0;
128 }
129
optee_release_helper(struct tee_context * ctx,int (* close_session)(struct tee_context * ctx,u32 session))130 static void optee_release_helper(struct tee_context *ctx,
131 int (*close_session)(struct tee_context *ctx,
132 u32 session))
133 {
134 struct optee_context_data *ctxdata = ctx->data;
135 struct optee_session *sess;
136 struct optee_session *sess_tmp;
137
138 if (!ctxdata)
139 return;
140
141 list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
142 list_node) {
143 list_del(&sess->list_node);
144 close_session(ctx, sess->session_id);
145 kfree(sess);
146 }
147 kfree(ctxdata);
148 ctx->data = NULL;
149 }
150
optee_release(struct tee_context * ctx)151 void optee_release(struct tee_context *ctx)
152 {
153 optee_release_helper(ctx, optee_close_session_helper);
154 }
155
optee_release_supp(struct tee_context * ctx)156 void optee_release_supp(struct tee_context *ctx)
157 {
158 struct optee *optee = tee_get_drvdata(ctx->teedev);
159
160 optee_release_helper(ctx, optee_close_session_helper);
161 if (optee->scan_bus_wq) {
162 destroy_workqueue(optee->scan_bus_wq);
163 optee->scan_bus_wq = NULL;
164 }
165 optee_supp_release(&optee->supp);
166 }
167
optee_remove_common(struct optee * optee)168 void optee_remove_common(struct optee *optee)
169 {
170 /* Unregister OP-TEE specific client devices on TEE bus */
171 optee_unregister_devices();
172
173 optee_notif_uninit(optee);
174 optee_shm_arg_cache_uninit(optee);
175 teedev_close_context(optee->ctx);
176 /*
177 * The two devices have to be unregistered before we can free the
178 * other resources.
179 */
180 tee_device_unregister(optee->supp_teedev);
181 tee_device_unregister(optee->teedev);
182
183 tee_shm_pool_free(optee->pool);
184 optee_supp_uninit(&optee->supp);
185 mutex_destroy(&optee->call_queue.mutex);
186 }
187
188 static int smc_abi_rc;
189 static int ffa_abi_rc;
190
optee_core_init(void)191 static int __init optee_core_init(void)
192 {
193 /*
194 * The kernel may have crashed at the same time that all available
195 * secure world threads were suspended and we cannot reschedule the
196 * suspended threads without access to the crashed kernel's wait_queue.
197 * Therefore, we cannot reliably initialize the OP-TEE driver in the
198 * kdump kernel.
199 */
200 if (is_kdump_kernel())
201 return -ENODEV;
202
203 smc_abi_rc = optee_smc_abi_register();
204 ffa_abi_rc = optee_ffa_abi_register();
205
206 /* If both failed there's no point with this module */
207 if (smc_abi_rc && ffa_abi_rc)
208 return smc_abi_rc;
209 return 0;
210 }
211 module_init(optee_core_init);
212
optee_core_exit(void)213 static void __exit optee_core_exit(void)
214 {
215 if (!smc_abi_rc)
216 optee_smc_abi_unregister();
217 if (!ffa_abi_rc)
218 optee_ffa_abi_unregister();
219 }
220 module_exit(optee_core_exit);
221
222 MODULE_AUTHOR("Linaro");
223 MODULE_DESCRIPTION("OP-TEE driver");
224 MODULE_VERSION("1.0");
225 MODULE_LICENSE("GPL v2");
226 MODULE_ALIAS("platform:optee");
227