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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(nr_pages * PAGE_SIZE,
38 GFP_KERNEL | __GFP_ZERO);
39 if (!shm->kaddr)
40 return -ENOMEM;
41
42 shm->paddr = virt_to_phys(shm->kaddr);
43 shm->size = nr_pages * PAGE_SIZE;
44
45 pages = kcalloc(nr_pages, 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(shm->kaddr, 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(shm->kaddr, shm->size);
78 shm->kaddr = NULL;
79 kfree(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(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(&optee->supp.mutex);
107 if (busy) {
108 kfree(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(&optee->scan_bus_work);
115 optee->scan_bus_done = true;
116 }
117 }
118 mutex_init(&ctxdata->mutex);
119 INIT_LIST_HEAD(&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(&sess->list_node);
141 close_session(ctx, sess->session_id, sess->use_sys_thread);
142 kfree(sess);
143 }
144 kfree(ctxdata);
145 ctx->data = NULL;
146}
147
148void optee_release(struct tee_context *ctx)
149{
150 optee_release_helper(ctx, optee_close_session_helper);
151}
152
153void optee_release_supp(struct tee_context *ctx)
154{
155 struct optee *optee = tee_get_drvdata(ctx->teedev);
156
157 optee_release_helper(ctx, optee_close_session_helper);
158
159 optee_supp_release(&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(optee->ctx);
170 /*
171 * The two devices have to be unregistered before we can free the
172 * other resources.
173 */
174 tee_device_unregister(optee->supp_teedev);
175 tee_device_unregister(optee->teedev);
176
177 tee_shm_pool_free(optee->pool);
178 optee_supp_uninit(&optee->supp);
179 mutex_destroy(&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");
1/*
2 * Copyright (c) 2015, Linaro Limited
3 *
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 */
14
15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
16
17#include <linux/arm-smccc.h>
18#include <linux/errno.h>
19#include <linux/io.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/of_platform.h>
23#include <linux/platform_device.h>
24#include <linux/slab.h>
25#include <linux/string.h>
26#include <linux/tee_drv.h>
27#include <linux/types.h>
28#include <linux/uaccess.h>
29#include "optee_private.h"
30#include "optee_smc.h"
31#include "shm_pool.h"
32
33#define DRIVER_NAME "optee"
34
35#define OPTEE_SHM_NUM_PRIV_PAGES 1
36
37/**
38 * optee_from_msg_param() - convert from OPTEE_MSG parameters to
39 * struct tee_param
40 * @params: subsystem internal parameter representation
41 * @num_params: number of elements in the parameter arrays
42 * @msg_params: OPTEE_MSG parameters
43 * Returns 0 on success or <0 on failure
44 */
45int optee_from_msg_param(struct tee_param *params, size_t num_params,
46 const struct optee_msg_param *msg_params)
47{
48 int rc;
49 size_t n;
50 struct tee_shm *shm;
51 phys_addr_t pa;
52
53 for (n = 0; n < num_params; n++) {
54 struct tee_param *p = params + n;
55 const struct optee_msg_param *mp = msg_params + n;
56 u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
57
58 switch (attr) {
59 case OPTEE_MSG_ATTR_TYPE_NONE:
60 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
61 memset(&p->u, 0, sizeof(p->u));
62 break;
63 case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
64 case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
65 case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
66 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
67 attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
68 p->u.value.a = mp->u.value.a;
69 p->u.value.b = mp->u.value.b;
70 p->u.value.c = mp->u.value.c;
71 break;
72 case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
73 case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
74 case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
75 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
76 attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
77 p->u.memref.size = mp->u.tmem.size;
78 shm = (struct tee_shm *)(unsigned long)
79 mp->u.tmem.shm_ref;
80 if (!shm) {
81 p->u.memref.shm_offs = 0;
82 p->u.memref.shm = NULL;
83 break;
84 }
85 rc = tee_shm_get_pa(shm, 0, &pa);
86 if (rc)
87 return rc;
88 p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
89 p->u.memref.shm = shm;
90
91 /* Check that the memref is covered by the shm object */
92 if (p->u.memref.size) {
93 size_t o = p->u.memref.shm_offs +
94 p->u.memref.size - 1;
95
96 rc = tee_shm_get_pa(shm, o, NULL);
97 if (rc)
98 return rc;
99 }
100 break;
101 case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
102 case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
103 case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
104 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
105 attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
106 p->u.memref.size = mp->u.rmem.size;
107 shm = (struct tee_shm *)(unsigned long)
108 mp->u.rmem.shm_ref;
109
110 if (!shm) {
111 p->u.memref.shm_offs = 0;
112 p->u.memref.shm = NULL;
113 break;
114 }
115 p->u.memref.shm_offs = mp->u.rmem.offs;
116 p->u.memref.shm = shm;
117
118 break;
119
120 default:
121 return -EINVAL;
122 }
123 }
124 return 0;
125}
126
127static int to_msg_param_tmp_mem(struct optee_msg_param *mp,
128 const struct tee_param *p)
129{
130 int rc;
131 phys_addr_t pa;
132
133 mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + p->attr -
134 TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
135
136 mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
137 mp->u.tmem.size = p->u.memref.size;
138
139 if (!p->u.memref.shm) {
140 mp->u.tmem.buf_ptr = 0;
141 return 0;
142 }
143
144 rc = tee_shm_get_pa(p->u.memref.shm, p->u.memref.shm_offs, &pa);
145 if (rc)
146 return rc;
147
148 mp->u.tmem.buf_ptr = pa;
149 mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
150 OPTEE_MSG_ATTR_CACHE_SHIFT;
151
152 return 0;
153}
154
155static int to_msg_param_reg_mem(struct optee_msg_param *mp,
156 const struct tee_param *p)
157{
158 mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
159 TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
160
161 mp->u.rmem.shm_ref = (unsigned long)p->u.memref.shm;
162 mp->u.rmem.size = p->u.memref.size;
163 mp->u.rmem.offs = p->u.memref.shm_offs;
164 return 0;
165}
166
167/**
168 * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
169 * @msg_params: OPTEE_MSG parameters
170 * @num_params: number of elements in the parameter arrays
171 * @params: subsystem itnernal parameter representation
172 * Returns 0 on success or <0 on failure
173 */
174int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
175 const struct tee_param *params)
176{
177 int rc;
178 size_t n;
179
180 for (n = 0; n < num_params; n++) {
181 const struct tee_param *p = params + n;
182 struct optee_msg_param *mp = msg_params + n;
183
184 switch (p->attr) {
185 case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
186 mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
187 memset(&mp->u, 0, sizeof(mp->u));
188 break;
189 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
190 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
191 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
192 mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
193 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
194 mp->u.value.a = p->u.value.a;
195 mp->u.value.b = p->u.value.b;
196 mp->u.value.c = p->u.value.c;
197 break;
198 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
199 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
200 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
201 if (tee_shm_is_registered(p->u.memref.shm))
202 rc = to_msg_param_reg_mem(mp, p);
203 else
204 rc = to_msg_param_tmp_mem(mp, p);
205 if (rc)
206 return rc;
207 break;
208 default:
209 return -EINVAL;
210 }
211 }
212 return 0;
213}
214
215static void optee_get_version(struct tee_device *teedev,
216 struct tee_ioctl_version_data *vers)
217{
218 struct tee_ioctl_version_data v = {
219 .impl_id = TEE_IMPL_ID_OPTEE,
220 .impl_caps = TEE_OPTEE_CAP_TZ,
221 .gen_caps = TEE_GEN_CAP_GP,
222 };
223 struct optee *optee = tee_get_drvdata(teedev);
224
225 if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
226 v.gen_caps |= TEE_GEN_CAP_REG_MEM;
227 *vers = v;
228}
229
230static int optee_open(struct tee_context *ctx)
231{
232 struct optee_context_data *ctxdata;
233 struct tee_device *teedev = ctx->teedev;
234 struct optee *optee = tee_get_drvdata(teedev);
235
236 ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
237 if (!ctxdata)
238 return -ENOMEM;
239
240 if (teedev == optee->supp_teedev) {
241 bool busy = true;
242
243 mutex_lock(&optee->supp.mutex);
244 if (!optee->supp.ctx) {
245 busy = false;
246 optee->supp.ctx = ctx;
247 }
248 mutex_unlock(&optee->supp.mutex);
249 if (busy) {
250 kfree(ctxdata);
251 return -EBUSY;
252 }
253 }
254
255 mutex_init(&ctxdata->mutex);
256 INIT_LIST_HEAD(&ctxdata->sess_list);
257
258 ctx->data = ctxdata;
259 return 0;
260}
261
262static void optee_release(struct tee_context *ctx)
263{
264 struct optee_context_data *ctxdata = ctx->data;
265 struct tee_device *teedev = ctx->teedev;
266 struct optee *optee = tee_get_drvdata(teedev);
267 struct tee_shm *shm;
268 struct optee_msg_arg *arg = NULL;
269 phys_addr_t parg;
270 struct optee_session *sess;
271 struct optee_session *sess_tmp;
272
273 if (!ctxdata)
274 return;
275
276 shm = tee_shm_alloc(ctx, sizeof(struct optee_msg_arg), TEE_SHM_MAPPED);
277 if (!IS_ERR(shm)) {
278 arg = tee_shm_get_va(shm, 0);
279 /*
280 * If va2pa fails for some reason, we can't call into
281 * secure world, only free the memory. Secure OS will leak
282 * sessions and finally refuse more sessions, but we will
283 * at least let normal world reclaim its memory.
284 */
285 if (!IS_ERR(arg))
286 if (tee_shm_va2pa(shm, arg, &parg))
287 arg = NULL; /* prevent usage of parg below */
288 }
289
290 list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
291 list_node) {
292 list_del(&sess->list_node);
293 if (!IS_ERR_OR_NULL(arg)) {
294 memset(arg, 0, sizeof(*arg));
295 arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
296 arg->session = sess->session_id;
297 optee_do_call_with_arg(ctx, parg);
298 }
299 kfree(sess);
300 }
301 kfree(ctxdata);
302
303 if (!IS_ERR(shm))
304 tee_shm_free(shm);
305
306 ctx->data = NULL;
307
308 if (teedev == optee->supp_teedev)
309 optee_supp_release(&optee->supp);
310}
311
312static const struct tee_driver_ops optee_ops = {
313 .get_version = optee_get_version,
314 .open = optee_open,
315 .release = optee_release,
316 .open_session = optee_open_session,
317 .close_session = optee_close_session,
318 .invoke_func = optee_invoke_func,
319 .cancel_req = optee_cancel_req,
320 .shm_register = optee_shm_register,
321 .shm_unregister = optee_shm_unregister,
322};
323
324static const struct tee_desc optee_desc = {
325 .name = DRIVER_NAME "-clnt",
326 .ops = &optee_ops,
327 .owner = THIS_MODULE,
328};
329
330static const struct tee_driver_ops optee_supp_ops = {
331 .get_version = optee_get_version,
332 .open = optee_open,
333 .release = optee_release,
334 .supp_recv = optee_supp_recv,
335 .supp_send = optee_supp_send,
336 .shm_register = optee_shm_register_supp,
337 .shm_unregister = optee_shm_unregister_supp,
338};
339
340static const struct tee_desc optee_supp_desc = {
341 .name = DRIVER_NAME "-supp",
342 .ops = &optee_supp_ops,
343 .owner = THIS_MODULE,
344 .flags = TEE_DESC_PRIVILEGED,
345};
346
347static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
348{
349 struct arm_smccc_res res;
350
351 invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
352
353 if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
354 res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
355 return true;
356 return false;
357}
358
359static void optee_msg_get_os_revision(optee_invoke_fn *invoke_fn)
360{
361 union {
362 struct arm_smccc_res smccc;
363 struct optee_smc_call_get_os_revision_result result;
364 } res = {
365 .result = {
366 .build_id = 0
367 }
368 };
369
370 invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
371 &res.smccc);
372
373 if (res.result.build_id)
374 pr_info("revision %lu.%lu (%08lx)", res.result.major,
375 res.result.minor, res.result.build_id);
376 else
377 pr_info("revision %lu.%lu", res.result.major, res.result.minor);
378}
379
380static bool optee_msg_api_revision_is_compatible(optee_invoke_fn *invoke_fn)
381{
382 union {
383 struct arm_smccc_res smccc;
384 struct optee_smc_calls_revision_result result;
385 } res;
386
387 invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
388
389 if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
390 (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
391 return true;
392 return false;
393}
394
395static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
396 u32 *sec_caps)
397{
398 union {
399 struct arm_smccc_res smccc;
400 struct optee_smc_exchange_capabilities_result result;
401 } res;
402 u32 a1 = 0;
403
404 /*
405 * TODO This isn't enough to tell if it's UP system (from kernel
406 * point of view) or not, is_smp() returns the the information
407 * needed, but can't be called directly from here.
408 */
409 if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
410 a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;
411
412 invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 0, 0, 0, 0, 0, 0,
413 &res.smccc);
414
415 if (res.result.status != OPTEE_SMC_RETURN_OK)
416 return false;
417
418 *sec_caps = res.result.capabilities;
419 return true;
420}
421
422static struct tee_shm_pool *
423optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm,
424 u32 sec_caps)
425{
426 union {
427 struct arm_smccc_res smccc;
428 struct optee_smc_get_shm_config_result result;
429 } res;
430 unsigned long vaddr;
431 phys_addr_t paddr;
432 size_t size;
433 phys_addr_t begin;
434 phys_addr_t end;
435 void *va;
436 struct tee_shm_pool_mgr *priv_mgr;
437 struct tee_shm_pool_mgr *dmabuf_mgr;
438 void *rc;
439
440 invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
441 if (res.result.status != OPTEE_SMC_RETURN_OK) {
442 pr_info("shm service not available\n");
443 return ERR_PTR(-ENOENT);
444 }
445
446 if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
447 pr_err("only normal cached shared memory supported\n");
448 return ERR_PTR(-EINVAL);
449 }
450
451 begin = roundup(res.result.start, PAGE_SIZE);
452 end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
453 paddr = begin;
454 size = end - begin;
455
456 if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
457 pr_err("too small shared memory area\n");
458 return ERR_PTR(-EINVAL);
459 }
460
461 va = memremap(paddr, size, MEMREMAP_WB);
462 if (!va) {
463 pr_err("shared memory ioremap failed\n");
464 return ERR_PTR(-EINVAL);
465 }
466 vaddr = (unsigned long)va;
467
468 /*
469 * If OP-TEE can work with unregistered SHM, we will use own pool
470 * for private shm
471 */
472 if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM) {
473 rc = optee_shm_pool_alloc_pages();
474 if (IS_ERR(rc))
475 goto err_memunmap;
476 priv_mgr = rc;
477 } else {
478 const size_t sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
479
480 rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
481 3 /* 8 bytes aligned */);
482 if (IS_ERR(rc))
483 goto err_memunmap;
484 priv_mgr = rc;
485
486 vaddr += sz;
487 paddr += sz;
488 size -= sz;
489 }
490
491 rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
492 if (IS_ERR(rc))
493 goto err_free_priv_mgr;
494 dmabuf_mgr = rc;
495
496 rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
497 if (IS_ERR(rc))
498 goto err_free_dmabuf_mgr;
499
500 *memremaped_shm = va;
501
502 return rc;
503
504err_free_dmabuf_mgr:
505 tee_shm_pool_mgr_destroy(dmabuf_mgr);
506err_free_priv_mgr:
507 tee_shm_pool_mgr_destroy(priv_mgr);
508err_memunmap:
509 memunmap(va);
510 return rc;
511}
512
513/* Simple wrapper functions to be able to use a function pointer */
514static void optee_smccc_smc(unsigned long a0, unsigned long a1,
515 unsigned long a2, unsigned long a3,
516 unsigned long a4, unsigned long a5,
517 unsigned long a6, unsigned long a7,
518 struct arm_smccc_res *res)
519{
520 arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
521}
522
523static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
524 unsigned long a2, unsigned long a3,
525 unsigned long a4, unsigned long a5,
526 unsigned long a6, unsigned long a7,
527 struct arm_smccc_res *res)
528{
529 arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
530}
531
532static optee_invoke_fn *get_invoke_func(struct device_node *np)
533{
534 const char *method;
535
536 pr_info("probing for conduit method from DT.\n");
537
538 if (of_property_read_string(np, "method", &method)) {
539 pr_warn("missing \"method\" property\n");
540 return ERR_PTR(-ENXIO);
541 }
542
543 if (!strcmp("hvc", method))
544 return optee_smccc_hvc;
545 else if (!strcmp("smc", method))
546 return optee_smccc_smc;
547
548 pr_warn("invalid \"method\" property: %s\n", method);
549 return ERR_PTR(-EINVAL);
550}
551
552static struct optee *optee_probe(struct device_node *np)
553{
554 optee_invoke_fn *invoke_fn;
555 struct tee_shm_pool *pool;
556 struct optee *optee = NULL;
557 void *memremaped_shm = NULL;
558 struct tee_device *teedev;
559 u32 sec_caps;
560 int rc;
561
562 invoke_fn = get_invoke_func(np);
563 if (IS_ERR(invoke_fn))
564 return (void *)invoke_fn;
565
566 if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
567 pr_warn("api uid mismatch\n");
568 return ERR_PTR(-EINVAL);
569 }
570
571 optee_msg_get_os_revision(invoke_fn);
572
573 if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
574 pr_warn("api revision mismatch\n");
575 return ERR_PTR(-EINVAL);
576 }
577
578 if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
579 pr_warn("capabilities mismatch\n");
580 return ERR_PTR(-EINVAL);
581 }
582
583 /*
584 * We have no other option for shared memory, if secure world
585 * doesn't have any reserved memory we can use we can't continue.
586 */
587 if (!(sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
588 return ERR_PTR(-EINVAL);
589
590 pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm, sec_caps);
591 if (IS_ERR(pool))
592 return (void *)pool;
593
594 optee = kzalloc(sizeof(*optee), GFP_KERNEL);
595 if (!optee) {
596 rc = -ENOMEM;
597 goto err;
598 }
599
600 optee->invoke_fn = invoke_fn;
601 optee->sec_caps = sec_caps;
602
603 teedev = tee_device_alloc(&optee_desc, NULL, pool, optee);
604 if (IS_ERR(teedev)) {
605 rc = PTR_ERR(teedev);
606 goto err;
607 }
608 optee->teedev = teedev;
609
610 teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
611 if (IS_ERR(teedev)) {
612 rc = PTR_ERR(teedev);
613 goto err;
614 }
615 optee->supp_teedev = teedev;
616
617 rc = tee_device_register(optee->teedev);
618 if (rc)
619 goto err;
620
621 rc = tee_device_register(optee->supp_teedev);
622 if (rc)
623 goto err;
624
625 mutex_init(&optee->call_queue.mutex);
626 INIT_LIST_HEAD(&optee->call_queue.waiters);
627 optee_wait_queue_init(&optee->wait_queue);
628 optee_supp_init(&optee->supp);
629 optee->memremaped_shm = memremaped_shm;
630 optee->pool = pool;
631
632 optee_enable_shm_cache(optee);
633
634 pr_info("initialized driver\n");
635 return optee;
636err:
637 if (optee) {
638 /*
639 * tee_device_unregister() is safe to call even if the
640 * devices hasn't been registered with
641 * tee_device_register() yet.
642 */
643 tee_device_unregister(optee->supp_teedev);
644 tee_device_unregister(optee->teedev);
645 kfree(optee);
646 }
647 if (pool)
648 tee_shm_pool_free(pool);
649 if (memremaped_shm)
650 memunmap(memremaped_shm);
651 return ERR_PTR(rc);
652}
653
654static void optee_remove(struct optee *optee)
655{
656 /*
657 * Ask OP-TEE to free all cached shared memory objects to decrease
658 * reference counters and also avoid wild pointers in secure world
659 * into the old shared memory range.
660 */
661 optee_disable_shm_cache(optee);
662
663 /*
664 * The two devices has to be unregistered before we can free the
665 * other resources.
666 */
667 tee_device_unregister(optee->supp_teedev);
668 tee_device_unregister(optee->teedev);
669
670 tee_shm_pool_free(optee->pool);
671 if (optee->memremaped_shm)
672 memunmap(optee->memremaped_shm);
673 optee_wait_queue_exit(&optee->wait_queue);
674 optee_supp_uninit(&optee->supp);
675 mutex_destroy(&optee->call_queue.mutex);
676
677 kfree(optee);
678}
679
680static const struct of_device_id optee_match[] = {
681 { .compatible = "linaro,optee-tz" },
682 {},
683};
684
685static struct optee *optee_svc;
686
687static int __init optee_driver_init(void)
688{
689 struct device_node *fw_np;
690 struct device_node *np;
691 struct optee *optee;
692
693 /* Node is supposed to be below /firmware */
694 fw_np = of_find_node_by_name(NULL, "firmware");
695 if (!fw_np)
696 return -ENODEV;
697
698 np = of_find_matching_node(fw_np, optee_match);
699 if (!np)
700 return -ENODEV;
701
702 optee = optee_probe(np);
703 of_node_put(np);
704
705 if (IS_ERR(optee))
706 return PTR_ERR(optee);
707
708 optee_svc = optee;
709
710 return 0;
711}
712module_init(optee_driver_init);
713
714static void __exit optee_driver_exit(void)
715{
716 struct optee *optee = optee_svc;
717
718 optee_svc = NULL;
719 if (optee)
720 optee_remove(optee);
721}
722module_exit(optee_driver_exit);
723
724MODULE_AUTHOR("Linaro");
725MODULE_DESCRIPTION("OP-TEE driver");
726MODULE_SUPPORTED_DEVICE("");
727MODULE_VERSION("1.0");
728MODULE_LICENSE("GPL v2");