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