1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015, Linaro Limited
4 */
5
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8 #include <linux/arm-smccc.h>
9 #include <linux/crash_dump.h>
10 #include <linux/errno.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/of_platform.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 #include <linux/string.h>
18 #include <linux/tee_drv.h>
19 #include <linux/types.h>
20 #include <linux/uaccess.h>
21 #include <linux/workqueue.h>
22 #include "optee_private.h"
23 #include "optee_smc.h"
24 #include "shm_pool.h"
25
26 #define DRIVER_NAME "optee"
27
28 #define OPTEE_SHM_NUM_PRIV_PAGES CONFIG_OPTEE_SHM_NUM_PRIV_PAGES
29
30 /**
31 * optee_from_msg_param() - convert from OPTEE_MSG parameters to
32 * struct tee_param
33 * @params: subsystem internal parameter representation
34 * @num_params: number of elements in the parameter arrays
35 * @msg_params: OPTEE_MSG parameters
36 * Returns 0 on success or <0 on failure
37 */
optee_from_msg_param(struct tee_param * params,size_t num_params,const struct optee_msg_param * msg_params)38 int optee_from_msg_param(struct tee_param *params, size_t num_params,
39 const struct optee_msg_param *msg_params)
40 {
41 int rc;
42 size_t n;
43 struct tee_shm *shm;
44 phys_addr_t pa;
45
46 for (n = 0; n < num_params; n++) {
47 struct tee_param *p = params + n;
48 const struct optee_msg_param *mp = msg_params + n;
49 u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
50
51 switch (attr) {
52 case OPTEE_MSG_ATTR_TYPE_NONE:
53 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
54 memset(&p->u, 0, sizeof(p->u));
55 break;
56 case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
57 case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
58 case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
59 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
60 attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
61 p->u.value.a = mp->u.value.a;
62 p->u.value.b = mp->u.value.b;
63 p->u.value.c = mp->u.value.c;
64 break;
65 case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
66 case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
67 case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
68 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
69 attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
70 p->u.memref.size = mp->u.tmem.size;
71 shm = (struct tee_shm *)(unsigned long)
72 mp->u.tmem.shm_ref;
73 if (!shm) {
74 p->u.memref.shm_offs = 0;
75 p->u.memref.shm = NULL;
76 break;
77 }
78 rc = tee_shm_get_pa(shm, 0, &pa);
79 if (rc)
80 return rc;
81 p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
82 p->u.memref.shm = shm;
83 break;
84 case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
85 case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
86 case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
87 p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
88 attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
89 p->u.memref.size = mp->u.rmem.size;
90 shm = (struct tee_shm *)(unsigned long)
91 mp->u.rmem.shm_ref;
92
93 if (!shm) {
94 p->u.memref.shm_offs = 0;
95 p->u.memref.shm = NULL;
96 break;
97 }
98 p->u.memref.shm_offs = mp->u.rmem.offs;
99 p->u.memref.shm = shm;
100
101 break;
102
103 default:
104 return -EINVAL;
105 }
106 }
107 return 0;
108 }
109
to_msg_param_tmp_mem(struct optee_msg_param * mp,const struct tee_param * p)110 static int to_msg_param_tmp_mem(struct optee_msg_param *mp,
111 const struct tee_param *p)
112 {
113 int rc;
114 phys_addr_t pa;
115
116 mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + p->attr -
117 TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
118
119 mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
120 mp->u.tmem.size = p->u.memref.size;
121
122 if (!p->u.memref.shm) {
123 mp->u.tmem.buf_ptr = 0;
124 return 0;
125 }
126
127 rc = tee_shm_get_pa(p->u.memref.shm, p->u.memref.shm_offs, &pa);
128 if (rc)
129 return rc;
130
131 mp->u.tmem.buf_ptr = pa;
132 mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
133 OPTEE_MSG_ATTR_CACHE_SHIFT;
134
135 return 0;
136 }
137
to_msg_param_reg_mem(struct optee_msg_param * mp,const struct tee_param * p)138 static int to_msg_param_reg_mem(struct optee_msg_param *mp,
139 const struct tee_param *p)
140 {
141 mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
142 TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
143
144 mp->u.rmem.shm_ref = (unsigned long)p->u.memref.shm;
145 mp->u.rmem.size = p->u.memref.size;
146 mp->u.rmem.offs = p->u.memref.shm_offs;
147 return 0;
148 }
149
150 /**
151 * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
152 * @msg_params: OPTEE_MSG parameters
153 * @num_params: number of elements in the parameter arrays
154 * @params: subsystem itnernal parameter representation
155 * Returns 0 on success or <0 on failure
156 */
optee_to_msg_param(struct optee_msg_param * msg_params,size_t num_params,const struct tee_param * params)157 int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
158 const struct tee_param *params)
159 {
160 int rc;
161 size_t n;
162
163 for (n = 0; n < num_params; n++) {
164 const struct tee_param *p = params + n;
165 struct optee_msg_param *mp = msg_params + n;
166
167 switch (p->attr) {
168 case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
169 mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
170 memset(&mp->u, 0, sizeof(mp->u));
171 break;
172 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
173 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
174 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
175 mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
176 TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
177 mp->u.value.a = p->u.value.a;
178 mp->u.value.b = p->u.value.b;
179 mp->u.value.c = p->u.value.c;
180 break;
181 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
182 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
183 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
184 if (tee_shm_is_registered(p->u.memref.shm))
185 rc = to_msg_param_reg_mem(mp, p);
186 else
187 rc = to_msg_param_tmp_mem(mp, p);
188 if (rc)
189 return rc;
190 break;
191 default:
192 return -EINVAL;
193 }
194 }
195 return 0;
196 }
197
optee_get_version(struct tee_device * teedev,struct tee_ioctl_version_data * vers)198 static void optee_get_version(struct tee_device *teedev,
199 struct tee_ioctl_version_data *vers)
200 {
201 struct tee_ioctl_version_data v = {
202 .impl_id = TEE_IMPL_ID_OPTEE,
203 .impl_caps = TEE_OPTEE_CAP_TZ,
204 .gen_caps = TEE_GEN_CAP_GP,
205 };
206 struct optee *optee = tee_get_drvdata(teedev);
207
208 if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
209 v.gen_caps |= TEE_GEN_CAP_REG_MEM;
210 if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
211 v.gen_caps |= TEE_GEN_CAP_MEMREF_NULL;
212 *vers = v;
213 }
214
optee_bus_scan(struct work_struct * work)215 static void optee_bus_scan(struct work_struct *work)
216 {
217 WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
218 }
219
optee_open(struct tee_context * ctx)220 static int optee_open(struct tee_context *ctx)
221 {
222 struct optee_context_data *ctxdata;
223 struct tee_device *teedev = ctx->teedev;
224 struct optee *optee = tee_get_drvdata(teedev);
225
226 ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
227 if (!ctxdata)
228 return -ENOMEM;
229
230 if (teedev == optee->supp_teedev) {
231 bool busy = true;
232
233 mutex_lock(&optee->supp.mutex);
234 if (!optee->supp.ctx) {
235 busy = false;
236 optee->supp.ctx = ctx;
237 }
238 mutex_unlock(&optee->supp.mutex);
239 if (busy) {
240 kfree(ctxdata);
241 return -EBUSY;
242 }
243
244 if (!optee->scan_bus_done) {
245 INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
246 optee->scan_bus_wq = create_workqueue("optee_bus_scan");
247 if (!optee->scan_bus_wq) {
248 kfree(ctxdata);
249 return -ECHILD;
250 }
251 queue_work(optee->scan_bus_wq, &optee->scan_bus_work);
252 optee->scan_bus_done = true;
253 }
254 }
255 mutex_init(&ctxdata->mutex);
256 INIT_LIST_HEAD(&ctxdata->sess_list);
257
258 if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
259 ctx->cap_memref_null = true;
260 else
261 ctx->cap_memref_null = false;
262
263 ctx->data = ctxdata;
264 return 0;
265 }
266
optee_release(struct tee_context * ctx)267 static void optee_release(struct tee_context *ctx)
268 {
269 struct optee_context_data *ctxdata = ctx->data;
270 struct tee_device *teedev = ctx->teedev;
271 struct optee *optee = tee_get_drvdata(teedev);
272 struct tee_shm *shm;
273 struct optee_msg_arg *arg = NULL;
274 phys_addr_t parg;
275 struct optee_session *sess;
276 struct optee_session *sess_tmp;
277
278 if (!ctxdata)
279 return;
280
281 shm = tee_shm_alloc(ctx, sizeof(struct optee_msg_arg),
282 TEE_SHM_MAPPED | TEE_SHM_PRIV);
283 if (!IS_ERR(shm)) {
284 arg = tee_shm_get_va(shm, 0);
285 /*
286 * If va2pa fails for some reason, we can't call into
287 * secure world, only free the memory. Secure OS will leak
288 * sessions and finally refuse more sessions, but we will
289 * at least let normal world reclaim its memory.
290 */
291 if (!IS_ERR(arg))
292 if (tee_shm_va2pa(shm, arg, &parg))
293 arg = NULL; /* prevent usage of parg below */
294 }
295
296 list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
297 list_node) {
298 list_del(&sess->list_node);
299 if (!IS_ERR_OR_NULL(arg)) {
300 memset(arg, 0, sizeof(*arg));
301 arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
302 arg->session = sess->session_id;
303 optee_do_call_with_arg(ctx, parg);
304 }
305 kfree(sess);
306 }
307 kfree(ctxdata);
308
309 if (!IS_ERR(shm))
310 tee_shm_free(shm);
311
312 ctx->data = NULL;
313
314 if (teedev == optee->supp_teedev) {
315 if (optee->scan_bus_wq) {
316 destroy_workqueue(optee->scan_bus_wq);
317 optee->scan_bus_wq = NULL;
318 }
319 optee_supp_release(&optee->supp);
320 }
321 }
322
323 static const struct tee_driver_ops optee_ops = {
324 .get_version = optee_get_version,
325 .open = optee_open,
326 .release = optee_release,
327 .open_session = optee_open_session,
328 .close_session = optee_close_session,
329 .invoke_func = optee_invoke_func,
330 .cancel_req = optee_cancel_req,
331 .shm_register = optee_shm_register,
332 .shm_unregister = optee_shm_unregister,
333 };
334
335 static const struct tee_desc optee_desc = {
336 .name = DRIVER_NAME "-clnt",
337 .ops = &optee_ops,
338 .owner = THIS_MODULE,
339 };
340
341 static const struct tee_driver_ops optee_supp_ops = {
342 .get_version = optee_get_version,
343 .open = optee_open,
344 .release = optee_release,
345 .supp_recv = optee_supp_recv,
346 .supp_send = optee_supp_send,
347 .shm_register = optee_shm_register_supp,
348 .shm_unregister = optee_shm_unregister_supp,
349 };
350
351 static const struct tee_desc optee_supp_desc = {
352 .name = DRIVER_NAME "-supp",
353 .ops = &optee_supp_ops,
354 .owner = THIS_MODULE,
355 .flags = TEE_DESC_PRIVILEGED,
356 };
357
optee_msg_api_uid_is_optee_api(optee_invoke_fn * invoke_fn)358 static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
359 {
360 struct arm_smccc_res res;
361
362 invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
363
364 if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
365 res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
366 return true;
367 return false;
368 }
369
optee_msg_get_os_revision(optee_invoke_fn * invoke_fn)370 static void optee_msg_get_os_revision(optee_invoke_fn *invoke_fn)
371 {
372 union {
373 struct arm_smccc_res smccc;
374 struct optee_smc_call_get_os_revision_result result;
375 } res = {
376 .result = {
377 .build_id = 0
378 }
379 };
380
381 invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
382 &res.smccc);
383
384 if (res.result.build_id)
385 pr_info("revision %lu.%lu (%08lx)", res.result.major,
386 res.result.minor, res.result.build_id);
387 else
388 pr_info("revision %lu.%lu", res.result.major, res.result.minor);
389 }
390
optee_msg_api_revision_is_compatible(optee_invoke_fn * invoke_fn)391 static bool optee_msg_api_revision_is_compatible(optee_invoke_fn *invoke_fn)
392 {
393 union {
394 struct arm_smccc_res smccc;
395 struct optee_smc_calls_revision_result result;
396 } res;
397
398 invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
399
400 if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
401 (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
402 return true;
403 return false;
404 }
405
optee_msg_exchange_capabilities(optee_invoke_fn * invoke_fn,u32 * sec_caps)406 static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
407 u32 *sec_caps)
408 {
409 union {
410 struct arm_smccc_res smccc;
411 struct optee_smc_exchange_capabilities_result result;
412 } res;
413 u32 a1 = 0;
414
415 /*
416 * TODO This isn't enough to tell if it's UP system (from kernel
417 * point of view) or not, is_smp() returns the the information
418 * needed, but can't be called directly from here.
419 */
420 if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
421 a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;
422
423 invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 0, 0, 0, 0, 0, 0,
424 &res.smccc);
425
426 if (res.result.status != OPTEE_SMC_RETURN_OK)
427 return false;
428
429 *sec_caps = res.result.capabilities;
430 return true;
431 }
432
optee_config_dyn_shm(void)433 static struct tee_shm_pool *optee_config_dyn_shm(void)
434 {
435 struct tee_shm_pool_mgr *priv_mgr;
436 struct tee_shm_pool_mgr *dmabuf_mgr;
437 void *rc;
438
439 rc = optee_shm_pool_alloc_pages();
440 if (IS_ERR(rc))
441 return rc;
442 priv_mgr = rc;
443
444 rc = optee_shm_pool_alloc_pages();
445 if (IS_ERR(rc)) {
446 tee_shm_pool_mgr_destroy(priv_mgr);
447 return rc;
448 }
449 dmabuf_mgr = rc;
450
451 rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
452 if (IS_ERR(rc)) {
453 tee_shm_pool_mgr_destroy(priv_mgr);
454 tee_shm_pool_mgr_destroy(dmabuf_mgr);
455 }
456
457 return rc;
458 }
459
460 static struct tee_shm_pool *
optee_config_shm_memremap(optee_invoke_fn * invoke_fn,void ** memremaped_shm)461 optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
462 {
463 union {
464 struct arm_smccc_res smccc;
465 struct optee_smc_get_shm_config_result result;
466 } res;
467 unsigned long vaddr;
468 phys_addr_t paddr;
469 size_t size;
470 phys_addr_t begin;
471 phys_addr_t end;
472 void *va;
473 struct tee_shm_pool_mgr *priv_mgr;
474 struct tee_shm_pool_mgr *dmabuf_mgr;
475 void *rc;
476 const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
477
478 invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
479 if (res.result.status != OPTEE_SMC_RETURN_OK) {
480 pr_err("static shm service not available\n");
481 return ERR_PTR(-ENOENT);
482 }
483
484 if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
485 pr_err("only normal cached shared memory supported\n");
486 return ERR_PTR(-EINVAL);
487 }
488
489 begin = roundup(res.result.start, PAGE_SIZE);
490 end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
491 paddr = begin;
492 size = end - begin;
493
494 if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
495 pr_err("too small shared memory area\n");
496 return ERR_PTR(-EINVAL);
497 }
498
499 va = memremap(paddr, size, MEMREMAP_WB);
500 if (!va) {
501 pr_err("shared memory ioremap failed\n");
502 return ERR_PTR(-EINVAL);
503 }
504 vaddr = (unsigned long)va;
505
506 rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
507 3 /* 8 bytes aligned */);
508 if (IS_ERR(rc))
509 goto err_memunmap;
510 priv_mgr = rc;
511
512 vaddr += sz;
513 paddr += sz;
514 size -= sz;
515
516 rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
517 if (IS_ERR(rc))
518 goto err_free_priv_mgr;
519 dmabuf_mgr = rc;
520
521 rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
522 if (IS_ERR(rc))
523 goto err_free_dmabuf_mgr;
524
525 *memremaped_shm = va;
526
527 return rc;
528
529 err_free_dmabuf_mgr:
530 tee_shm_pool_mgr_destroy(dmabuf_mgr);
531 err_free_priv_mgr:
532 tee_shm_pool_mgr_destroy(priv_mgr);
533 err_memunmap:
534 memunmap(va);
535 return rc;
536 }
537
538 /* Simple wrapper functions to be able to use a function pointer */
optee_smccc_smc(unsigned long a0,unsigned long a1,unsigned long a2,unsigned long a3,unsigned long a4,unsigned long a5,unsigned long a6,unsigned long a7,struct arm_smccc_res * res)539 static void optee_smccc_smc(unsigned long a0, unsigned long a1,
540 unsigned long a2, unsigned long a3,
541 unsigned long a4, unsigned long a5,
542 unsigned long a6, unsigned long a7,
543 struct arm_smccc_res *res)
544 {
545 arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
546 }
547
optee_smccc_hvc(unsigned long a0,unsigned long a1,unsigned long a2,unsigned long a3,unsigned long a4,unsigned long a5,unsigned long a6,unsigned long a7,struct arm_smccc_res * res)548 static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
549 unsigned long a2, unsigned long a3,
550 unsigned long a4, unsigned long a5,
551 unsigned long a6, unsigned long a7,
552 struct arm_smccc_res *res)
553 {
554 arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
555 }
556
get_invoke_func(struct device * dev)557 static optee_invoke_fn *get_invoke_func(struct device *dev)
558 {
559 const char *method;
560
561 pr_info("probing for conduit method.\n");
562
563 if (device_property_read_string(dev, "method", &method)) {
564 pr_warn("missing \"method\" property\n");
565 return ERR_PTR(-ENXIO);
566 }
567
568 if (!strcmp("hvc", method))
569 return optee_smccc_hvc;
570 else if (!strcmp("smc", method))
571 return optee_smccc_smc;
572
573 pr_warn("invalid \"method\" property: %s\n", method);
574 return ERR_PTR(-EINVAL);
575 }
576
577 /* optee_remove - Device Removal Routine
578 * @pdev: platform device information struct
579 *
580 * optee_remove is called by platform subsystem to alert the driver
581 * that it should release the device
582 */
583
optee_remove(struct platform_device * pdev)584 static int optee_remove(struct platform_device *pdev)
585 {
586 struct optee *optee = platform_get_drvdata(pdev);
587
588 /* Unregister OP-TEE specific client devices on TEE bus */
589 optee_unregister_devices();
590
591 /*
592 * Ask OP-TEE to free all cached shared memory objects to decrease
593 * reference counters and also avoid wild pointers in secure world
594 * into the old shared memory range.
595 */
596 optee_disable_shm_cache(optee);
597
598 /*
599 * The two devices have to be unregistered before we can free the
600 * other resources.
601 */
602 tee_device_unregister(optee->supp_teedev);
603 tee_device_unregister(optee->teedev);
604
605 tee_shm_pool_free(optee->pool);
606 if (optee->memremaped_shm)
607 memunmap(optee->memremaped_shm);
608 optee_wait_queue_exit(&optee->wait_queue);
609 optee_supp_uninit(&optee->supp);
610 mutex_destroy(&optee->call_queue.mutex);
611
612 kfree(optee);
613
614 return 0;
615 }
616
617 /* optee_shutdown - Device Removal Routine
618 * @pdev: platform device information struct
619 *
620 * platform_shutdown is called by the platform subsystem to alert
621 * the driver that a shutdown, reboot, or kexec is happening and
622 * device must be disabled.
623 */
optee_shutdown(struct platform_device * pdev)624 static void optee_shutdown(struct platform_device *pdev)
625 {
626 optee_disable_shm_cache(platform_get_drvdata(pdev));
627 }
628
optee_probe(struct platform_device * pdev)629 static int optee_probe(struct platform_device *pdev)
630 {
631 optee_invoke_fn *invoke_fn;
632 struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
633 struct optee *optee = NULL;
634 void *memremaped_shm = NULL;
635 struct tee_device *teedev;
636 u32 sec_caps;
637 int rc;
638
639 /*
640 * The kernel may have crashed at the same time that all available
641 * secure world threads were suspended and we cannot reschedule the
642 * suspended threads without access to the crashed kernel's wait_queue.
643 * Therefore, we cannot reliably initialize the OP-TEE driver in the
644 * kdump kernel.
645 */
646 if (is_kdump_kernel())
647 return -ENODEV;
648
649 invoke_fn = get_invoke_func(&pdev->dev);
650 if (IS_ERR(invoke_fn))
651 return PTR_ERR(invoke_fn);
652
653 if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
654 pr_warn("api uid mismatch\n");
655 return -EINVAL;
656 }
657
658 optee_msg_get_os_revision(invoke_fn);
659
660 if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
661 pr_warn("api revision mismatch\n");
662 return -EINVAL;
663 }
664
665 if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
666 pr_warn("capabilities mismatch\n");
667 return -EINVAL;
668 }
669
670 /*
671 * Try to use dynamic shared memory if possible
672 */
673 if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
674 pool = optee_config_dyn_shm();
675
676 /*
677 * If dynamic shared memory is not available or failed - try static one
678 */
679 if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
680 pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);
681
682 if (IS_ERR(pool))
683 return PTR_ERR(pool);
684
685 optee = kzalloc(sizeof(*optee), GFP_KERNEL);
686 if (!optee) {
687 rc = -ENOMEM;
688 goto err;
689 }
690
691 optee->invoke_fn = invoke_fn;
692 optee->sec_caps = sec_caps;
693
694 teedev = tee_device_alloc(&optee_desc, NULL, pool, optee);
695 if (IS_ERR(teedev)) {
696 rc = PTR_ERR(teedev);
697 goto err;
698 }
699 optee->teedev = teedev;
700
701 teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
702 if (IS_ERR(teedev)) {
703 rc = PTR_ERR(teedev);
704 goto err;
705 }
706 optee->supp_teedev = teedev;
707
708 rc = tee_device_register(optee->teedev);
709 if (rc)
710 goto err;
711
712 rc = tee_device_register(optee->supp_teedev);
713 if (rc)
714 goto err;
715
716 mutex_init(&optee->call_queue.mutex);
717 INIT_LIST_HEAD(&optee->call_queue.waiters);
718 optee_wait_queue_init(&optee->wait_queue);
719 optee_supp_init(&optee->supp);
720 optee->memremaped_shm = memremaped_shm;
721 optee->pool = pool;
722
723 /*
724 * Ensure that there are no pre-existing shm objects before enabling
725 * the shm cache so that there's no chance of receiving an invalid
726 * address during shutdown. This could occur, for example, if we're
727 * kexec booting from an older kernel that did not properly cleanup the
728 * shm cache.
729 */
730 optee_disable_unmapped_shm_cache(optee);
731
732 optee_enable_shm_cache(optee);
733
734 if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
735 pr_info("dynamic shared memory is enabled\n");
736
737 platform_set_drvdata(pdev, optee);
738
739 rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
740 if (rc) {
741 optee_remove(pdev);
742 return rc;
743 }
744
745 pr_info("initialized driver\n");
746 return 0;
747 err:
748 if (optee) {
749 /*
750 * tee_device_unregister() is safe to call even if the
751 * devices hasn't been registered with
752 * tee_device_register() yet.
753 */
754 tee_device_unregister(optee->supp_teedev);
755 tee_device_unregister(optee->teedev);
756 kfree(optee);
757 }
758 if (pool)
759 tee_shm_pool_free(pool);
760 if (memremaped_shm)
761 memunmap(memremaped_shm);
762 return rc;
763 }
764
765 static const struct of_device_id optee_dt_match[] = {
766 { .compatible = "linaro,optee-tz" },
767 {},
768 };
769 MODULE_DEVICE_TABLE(of, optee_dt_match);
770
771 static struct platform_driver optee_driver = {
772 .probe = optee_probe,
773 .remove = optee_remove,
774 .shutdown = optee_shutdown,
775 .driver = {
776 .name = "optee",
777 .of_match_table = optee_dt_match,
778 },
779 };
780 module_platform_driver(optee_driver);
781
782 MODULE_AUTHOR("Linaro");
783 MODULE_DESCRIPTION("OP-TEE driver");
784 MODULE_SUPPORTED_DEVICE("");
785 MODULE_VERSION("1.0");
786 MODULE_LICENSE("GPL v2");
787 MODULE_ALIAS("platform:optee");
788