Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
21int 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
67err:
68 free_pages((unsigned long)shm->kaddr, order);
69 return rc;
70}
71
72void 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
82static void optee_bus_scan(struct work_struct *work)
83{
84 WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
85}
86
87int 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
130static 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
151void optee_release(struct tee_context *ctx)
152{
153 optee_release_helper(ctx, optee_close_session_helper);
154}
155
156void 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
168void 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 teedev_close_context(optee->ctx);
175 /*
176 * The two devices have to be unregistered before we can free the
177 * other resources.
178 */
179 tee_device_unregister(optee->supp_teedev);
180 tee_device_unregister(optee->teedev);
181
182 tee_shm_pool_free(optee->pool);
183 optee_supp_uninit(&optee->supp);
184 mutex_destroy(&optee->call_queue.mutex);
185}
186
187static int smc_abi_rc;
188static int ffa_abi_rc;
189
190static int optee_core_init(void)
191{
192 /*
193 * The kernel may have crashed at the same time that all available
194 * secure world threads were suspended and we cannot reschedule the
195 * suspended threads without access to the crashed kernel's wait_queue.
196 * Therefore, we cannot reliably initialize the OP-TEE driver in the
197 * kdump kernel.
198 */
199 if (is_kdump_kernel())
200 return -ENODEV;
201
202 smc_abi_rc = optee_smc_abi_register();
203 ffa_abi_rc = optee_ffa_abi_register();
204
205 /* If both failed there's no point with this module */
206 if (smc_abi_rc && ffa_abi_rc)
207 return smc_abi_rc;
208 return 0;
209}
210module_init(optee_core_init);
211
212static void optee_core_exit(void)
213{
214 if (!smc_abi_rc)
215 optee_smc_abi_unregister();
216 if (!ffa_abi_rc)
217 optee_ffa_abi_unregister();
218}
219module_exit(optee_core_exit);
220
221MODULE_AUTHOR("Linaro");
222MODULE_DESCRIPTION("OP-TEE driver");
223MODULE_VERSION("1.0");
224MODULE_LICENSE("GPL v2");
225MODULE_ALIAS("platform:optee");