1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2015-2016, Linaro Limited
6 #define pr_fmt(fmt) "%s: " fmt, __func__
8 #include <linux/cdev.h>
9 #include <linux/cred.h>
11 #include <linux/idr.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/tee_drv.h>
15 #include <linux/uaccess.h>
16 #include <crypto/hash.h>
17 #include <crypto/sha.h>
18 #include "tee_private.h"
20 #define TEE_NUM_DEVICES 32
22 #define TEE_IOCTL_PARAM_SIZE(x) (sizeof(struct tee_param) * (x))
24 #define TEE_UUID_NS_NAME_SIZE 128
27 * TEE Client UUID name space identifier (UUIDv4)
29 * Value here is random UUID that is allocated as name space identifier for
30 * forming Client UUID's for TEE environment using UUIDv5 scheme.
32 static const uuid_t tee_client_uuid_ns = UUID_INIT(0x58ac9ca0, 0x2086, 0x4683,
33 0xa1, 0xb8, 0xec, 0x4b,
34 0xc0, 0x8e, 0x01, 0xb6);
37 * Unprivileged devices in the lower half range and privileged devices in
38 * the upper half range.
40 static DECLARE_BITMAP(dev_mask, TEE_NUM_DEVICES);
41 static DEFINE_SPINLOCK(driver_lock);
43 static struct class *tee_class;
44 static dev_t tee_devt;
46 static struct tee_context *teedev_open(struct tee_device *teedev)
49 struct tee_context *ctx;
51 if (!tee_device_get(teedev))
52 return ERR_PTR(-EINVAL);
54 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
60 kref_init(&ctx->refcount);
62 rc = teedev->desc->ops->open(ctx);
69 tee_device_put(teedev);
74 void teedev_ctx_get(struct tee_context *ctx)
79 kref_get(&ctx->refcount);
82 static void teedev_ctx_release(struct kref *ref)
84 struct tee_context *ctx = container_of(ref, struct tee_context,
86 ctx->releasing = true;
87 ctx->teedev->desc->ops->release(ctx);
91 void teedev_ctx_put(struct tee_context *ctx)
96 kref_put(&ctx->refcount, teedev_ctx_release);
99 static void teedev_close_context(struct tee_context *ctx)
101 tee_device_put(ctx->teedev);
105 static int tee_open(struct inode *inode, struct file *filp)
107 struct tee_context *ctx;
109 ctx = teedev_open(container_of(inode->i_cdev, struct tee_device, cdev));
114 * Default user-space behaviour is to wait for tee-supplicant
115 * if not present for any requests in this context.
117 ctx->supp_nowait = false;
118 filp->private_data = ctx;
122 static int tee_release(struct inode *inode, struct file *filp)
124 teedev_close_context(filp->private_data);
129 * uuid_v5() - Calculate UUIDv5
130 * @uuid: Resulting UUID
131 * @ns: Name space ID for UUIDv5 function
132 * @name: Name for UUIDv5 function
133 * @size: Size of name
135 * UUIDv5 is specific in RFC 4122.
137 * This implements section (for SHA-1):
138 * 4.3. Algorithm for Creating a Name-Based UUID
140 static int uuid_v5(uuid_t *uuid, const uuid_t *ns, const void *name,
143 unsigned char hash[SHA1_DIGEST_SIZE];
144 struct crypto_shash *shash = NULL;
145 struct shash_desc *desc = NULL;
148 shash = crypto_alloc_shash("sha1", 0, 0);
151 pr_err("shash(sha1) allocation failed\n");
155 desc = kzalloc(sizeof(*desc) + crypto_shash_descsize(shash),
164 rc = crypto_shash_init(desc);
168 rc = crypto_shash_update(desc, (const u8 *)ns, sizeof(*ns));
172 rc = crypto_shash_update(desc, (const u8 *)name, size);
176 rc = crypto_shash_final(desc, hash);
180 memcpy(uuid->b, hash, UUID_SIZE);
182 /* Tag for version 5 */
183 uuid->b[6] = (hash[6] & 0x0F) | 0x50;
184 uuid->b[8] = (hash[8] & 0x3F) | 0x80;
190 crypto_free_shash(shash);
194 int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
195 const u8 connection_data[TEE_IOCTL_UUID_LEN])
197 gid_t ns_grp = (gid_t)-1;
198 kgid_t grp = INVALID_GID;
203 if (connection_method == TEE_IOCTL_LOGIN_PUBLIC) {
204 /* Nil UUID to be passed to TEE environment */
205 uuid_copy(uuid, &uuid_null);
210 * In Linux environment client UUID is based on UUIDv5.
212 * Determine client UUID with following semantics for 'name':
214 * For TEEC_LOGIN_USER:
217 * For TEEC_LOGIN_GROUP:
222 name = kzalloc(TEE_UUID_NS_NAME_SIZE, GFP_KERNEL);
226 switch (connection_method) {
227 case TEE_IOCTL_LOGIN_USER:
228 name_len = snprintf(name, TEE_UUID_NS_NAME_SIZE, "uid=%x",
230 if (name_len >= TEE_UUID_NS_NAME_SIZE) {
236 case TEE_IOCTL_LOGIN_GROUP:
237 memcpy(&ns_grp, connection_data, sizeof(gid_t));
238 grp = make_kgid(current_user_ns(), ns_grp);
239 if (!gid_valid(grp) || !in_egroup_p(grp)) {
244 name_len = snprintf(name, TEE_UUID_NS_NAME_SIZE, "gid=%x",
246 if (name_len >= TEE_UUID_NS_NAME_SIZE) {
257 rc = uuid_v5(uuid, &tee_client_uuid_ns, name, name_len);
263 EXPORT_SYMBOL_GPL(tee_session_calc_client_uuid);
265 static int tee_ioctl_version(struct tee_context *ctx,
266 struct tee_ioctl_version_data __user *uvers)
268 struct tee_ioctl_version_data vers;
270 ctx->teedev->desc->ops->get_version(ctx->teedev, &vers);
272 if (ctx->teedev->desc->flags & TEE_DESC_PRIVILEGED)
273 vers.gen_caps |= TEE_GEN_CAP_PRIVILEGED;
275 if (copy_to_user(uvers, &vers, sizeof(vers)))
281 static int tee_ioctl_shm_alloc(struct tee_context *ctx,
282 struct tee_ioctl_shm_alloc_data __user *udata)
285 struct tee_ioctl_shm_alloc_data data;
288 if (copy_from_user(&data, udata, sizeof(data)))
291 /* Currently no input flags are supported */
295 shm = tee_shm_alloc(ctx, data.size, TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
300 data.flags = shm->flags;
301 data.size = shm->size;
303 if (copy_to_user(udata, &data, sizeof(data)))
306 ret = tee_shm_get_fd(shm);
309 * When user space closes the file descriptor the shared memory
310 * should be freed or if tee_shm_get_fd() failed then it will
311 * be freed immediately.
318 tee_ioctl_shm_register(struct tee_context *ctx,
319 struct tee_ioctl_shm_register_data __user *udata)
322 struct tee_ioctl_shm_register_data data;
325 if (copy_from_user(&data, udata, sizeof(data)))
328 /* Currently no input flags are supported */
332 shm = tee_shm_register(ctx, data.addr, data.length,
333 TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED);
338 data.flags = shm->flags;
339 data.length = shm->size;
341 if (copy_to_user(udata, &data, sizeof(data)))
344 ret = tee_shm_get_fd(shm);
346 * When user space closes the file descriptor the shared memory
347 * should be freed or if tee_shm_get_fd() failed then it will
348 * be freed immediately.
354 static int params_from_user(struct tee_context *ctx, struct tee_param *params,
356 struct tee_ioctl_param __user *uparams)
360 for (n = 0; n < num_params; n++) {
362 struct tee_ioctl_param ip;
364 if (copy_from_user(&ip, uparams + n, sizeof(ip)))
367 /* All unused attribute bits has to be zero */
368 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
371 params[n].attr = ip.attr;
372 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
373 case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
374 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
376 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
377 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
378 params[n].u.value.a = ip.a;
379 params[n].u.value.b = ip.b;
380 params[n].u.value.c = ip.c;
382 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
383 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
384 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
386 * If we fail to get a pointer to a shared memory
387 * object (and increase the ref count) from an
388 * identifier we return an error. All pointers that
389 * has been added in params have an increased ref
390 * count. It's the callers responibility to do
391 * tee_shm_put() on all resolved pointers.
393 shm = tee_shm_get_from_id(ctx, ip.c);
398 * Ensure offset + size does not overflow offset
399 * and does not overflow the size of the referred
400 * shared memory object.
402 if ((ip.a + ip.b) < ip.a ||
403 (ip.a + ip.b) > shm->size) {
408 params[n].u.memref.shm_offs = ip.a;
409 params[n].u.memref.size = ip.b;
410 params[n].u.memref.shm = shm;
413 /* Unknown attribute */
420 static int params_to_user(struct tee_ioctl_param __user *uparams,
421 size_t num_params, struct tee_param *params)
425 for (n = 0; n < num_params; n++) {
426 struct tee_ioctl_param __user *up = uparams + n;
427 struct tee_param *p = params + n;
430 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
431 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
432 if (put_user(p->u.value.a, &up->a) ||
433 put_user(p->u.value.b, &up->b) ||
434 put_user(p->u.value.c, &up->c))
437 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
438 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
439 if (put_user((u64)p->u.memref.size, &up->b))
448 static int tee_ioctl_open_session(struct tee_context *ctx,
449 struct tee_ioctl_buf_data __user *ubuf)
453 struct tee_ioctl_buf_data buf;
454 struct tee_ioctl_open_session_arg __user *uarg;
455 struct tee_ioctl_open_session_arg arg;
456 struct tee_ioctl_param __user *uparams = NULL;
457 struct tee_param *params = NULL;
458 bool have_session = false;
460 if (!ctx->teedev->desc->ops->open_session)
463 if (copy_from_user(&buf, ubuf, sizeof(buf)))
466 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
467 buf.buf_len < sizeof(struct tee_ioctl_open_session_arg))
470 uarg = u64_to_user_ptr(buf.buf_ptr);
471 if (copy_from_user(&arg, uarg, sizeof(arg)))
474 if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
477 if (arg.num_params) {
478 params = kcalloc(arg.num_params, sizeof(struct tee_param),
482 uparams = uarg->params;
483 rc = params_from_user(ctx, params, arg.num_params, uparams);
488 if (arg.clnt_login >= TEE_IOCTL_LOGIN_REE_KERNEL_MIN &&
489 arg.clnt_login <= TEE_IOCTL_LOGIN_REE_KERNEL_MAX) {
490 pr_debug("login method not allowed for user-space client\n");
495 rc = ctx->teedev->desc->ops->open_session(ctx, &arg, params);
500 if (put_user(arg.session, &uarg->session) ||
501 put_user(arg.ret, &uarg->ret) ||
502 put_user(arg.ret_origin, &uarg->ret_origin)) {
506 rc = params_to_user(uparams, arg.num_params, params);
509 * If we've succeeded to open the session but failed to communicate
510 * it back to user space, close the session again to avoid leakage.
512 if (rc && have_session && ctx->teedev->desc->ops->close_session)
513 ctx->teedev->desc->ops->close_session(ctx, arg.session);
516 /* Decrease ref count for all valid shared memory pointers */
517 for (n = 0; n < arg.num_params; n++)
518 if (tee_param_is_memref(params + n) &&
519 params[n].u.memref.shm)
520 tee_shm_put(params[n].u.memref.shm);
527 static int tee_ioctl_invoke(struct tee_context *ctx,
528 struct tee_ioctl_buf_data __user *ubuf)
532 struct tee_ioctl_buf_data buf;
533 struct tee_ioctl_invoke_arg __user *uarg;
534 struct tee_ioctl_invoke_arg arg;
535 struct tee_ioctl_param __user *uparams = NULL;
536 struct tee_param *params = NULL;
538 if (!ctx->teedev->desc->ops->invoke_func)
541 if (copy_from_user(&buf, ubuf, sizeof(buf)))
544 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
545 buf.buf_len < sizeof(struct tee_ioctl_invoke_arg))
548 uarg = u64_to_user_ptr(buf.buf_ptr);
549 if (copy_from_user(&arg, uarg, sizeof(arg)))
552 if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
555 if (arg.num_params) {
556 params = kcalloc(arg.num_params, sizeof(struct tee_param),
560 uparams = uarg->params;
561 rc = params_from_user(ctx, params, arg.num_params, uparams);
566 rc = ctx->teedev->desc->ops->invoke_func(ctx, &arg, params);
570 if (put_user(arg.ret, &uarg->ret) ||
571 put_user(arg.ret_origin, &uarg->ret_origin)) {
575 rc = params_to_user(uparams, arg.num_params, params);
578 /* Decrease ref count for all valid shared memory pointers */
579 for (n = 0; n < arg.num_params; n++)
580 if (tee_param_is_memref(params + n) &&
581 params[n].u.memref.shm)
582 tee_shm_put(params[n].u.memref.shm);
588 static int tee_ioctl_cancel(struct tee_context *ctx,
589 struct tee_ioctl_cancel_arg __user *uarg)
591 struct tee_ioctl_cancel_arg arg;
593 if (!ctx->teedev->desc->ops->cancel_req)
596 if (copy_from_user(&arg, uarg, sizeof(arg)))
599 return ctx->teedev->desc->ops->cancel_req(ctx, arg.cancel_id,
604 tee_ioctl_close_session(struct tee_context *ctx,
605 struct tee_ioctl_close_session_arg __user *uarg)
607 struct tee_ioctl_close_session_arg arg;
609 if (!ctx->teedev->desc->ops->close_session)
612 if (copy_from_user(&arg, uarg, sizeof(arg)))
615 return ctx->teedev->desc->ops->close_session(ctx, arg.session);
618 static int params_to_supp(struct tee_context *ctx,
619 struct tee_ioctl_param __user *uparams,
620 size_t num_params, struct tee_param *params)
624 for (n = 0; n < num_params; n++) {
625 struct tee_ioctl_param ip;
626 struct tee_param *p = params + n;
629 switch (p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
630 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
631 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
636 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
637 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
638 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
639 ip.b = p->u.memref.size;
640 if (!p->u.memref.shm) {
642 ip.c = (u64)-1; /* invalid shm id */
645 ip.a = p->u.memref.shm_offs;
646 ip.c = p->u.memref.shm->id;
655 if (copy_to_user(uparams + n, &ip, sizeof(ip)))
662 static int tee_ioctl_supp_recv(struct tee_context *ctx,
663 struct tee_ioctl_buf_data __user *ubuf)
666 struct tee_ioctl_buf_data buf;
667 struct tee_iocl_supp_recv_arg __user *uarg;
668 struct tee_param *params;
672 if (!ctx->teedev->desc->ops->supp_recv)
675 if (copy_from_user(&buf, ubuf, sizeof(buf)))
678 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
679 buf.buf_len < sizeof(struct tee_iocl_supp_recv_arg))
682 uarg = u64_to_user_ptr(buf.buf_ptr);
683 if (get_user(num_params, &uarg->num_params))
686 if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) != buf.buf_len)
689 params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
693 rc = params_from_user(ctx, params, num_params, uarg->params);
697 rc = ctx->teedev->desc->ops->supp_recv(ctx, &func, &num_params, params);
701 if (put_user(func, &uarg->func) ||
702 put_user(num_params, &uarg->num_params)) {
707 rc = params_to_supp(ctx, uarg->params, num_params, params);
713 static int params_from_supp(struct tee_param *params, size_t num_params,
714 struct tee_ioctl_param __user *uparams)
718 for (n = 0; n < num_params; n++) {
719 struct tee_param *p = params + n;
720 struct tee_ioctl_param ip;
722 if (copy_from_user(&ip, uparams + n, sizeof(ip)))
725 /* All unused attribute bits has to be zero */
726 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
730 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
731 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
732 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
733 /* Only out and in/out values can be updated */
738 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
739 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
741 * Only the size of the memref can be updated.
742 * Since we don't have access to the original
743 * parameters here, only store the supplied size.
744 * The driver will copy the updated size into the
745 * original parameters.
747 p->u.memref.shm = NULL;
748 p->u.memref.shm_offs = 0;
749 p->u.memref.size = ip.b;
752 memset(&p->u, 0, sizeof(p->u));
759 static int tee_ioctl_supp_send(struct tee_context *ctx,
760 struct tee_ioctl_buf_data __user *ubuf)
763 struct tee_ioctl_buf_data buf;
764 struct tee_iocl_supp_send_arg __user *uarg;
765 struct tee_param *params;
769 /* Not valid for this driver */
770 if (!ctx->teedev->desc->ops->supp_send)
773 if (copy_from_user(&buf, ubuf, sizeof(buf)))
776 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
777 buf.buf_len < sizeof(struct tee_iocl_supp_send_arg))
780 uarg = u64_to_user_ptr(buf.buf_ptr);
781 if (get_user(ret, &uarg->ret) ||
782 get_user(num_params, &uarg->num_params))
785 if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) > buf.buf_len)
788 params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
792 rc = params_from_supp(params, num_params, uarg->params);
796 rc = ctx->teedev->desc->ops->supp_send(ctx, ret, num_params, params);
802 static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
804 struct tee_context *ctx = filp->private_data;
805 void __user *uarg = (void __user *)arg;
808 case TEE_IOC_VERSION:
809 return tee_ioctl_version(ctx, uarg);
810 case TEE_IOC_SHM_ALLOC:
811 return tee_ioctl_shm_alloc(ctx, uarg);
812 case TEE_IOC_SHM_REGISTER:
813 return tee_ioctl_shm_register(ctx, uarg);
814 case TEE_IOC_OPEN_SESSION:
815 return tee_ioctl_open_session(ctx, uarg);
817 return tee_ioctl_invoke(ctx, uarg);
819 return tee_ioctl_cancel(ctx, uarg);
820 case TEE_IOC_CLOSE_SESSION:
821 return tee_ioctl_close_session(ctx, uarg);
822 case TEE_IOC_SUPPL_RECV:
823 return tee_ioctl_supp_recv(ctx, uarg);
824 case TEE_IOC_SUPPL_SEND:
825 return tee_ioctl_supp_send(ctx, uarg);
831 static const struct file_operations tee_fops = {
832 .owner = THIS_MODULE,
834 .release = tee_release,
835 .unlocked_ioctl = tee_ioctl,
836 .compat_ioctl = compat_ptr_ioctl,
839 static void tee_release_device(struct device *dev)
841 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
843 spin_lock(&driver_lock);
844 clear_bit(teedev->id, dev_mask);
845 spin_unlock(&driver_lock);
846 mutex_destroy(&teedev->mutex);
847 idr_destroy(&teedev->idr);
852 * tee_device_alloc() - Allocate a new struct tee_device instance
853 * @teedesc: Descriptor for this driver
854 * @dev: Parent device for this device
855 * @pool: Shared memory pool, NULL if not used
856 * @driver_data: Private driver data for this device
858 * Allocates a new struct tee_device instance. The device is
859 * removed by tee_device_unregister().
861 * @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
863 struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
865 struct tee_shm_pool *pool,
868 struct tee_device *teedev;
873 if (!teedesc || !teedesc->name || !teedesc->ops ||
874 !teedesc->ops->get_version || !teedesc->ops->open ||
875 !teedesc->ops->release || !pool)
876 return ERR_PTR(-EINVAL);
878 teedev = kzalloc(sizeof(*teedev), GFP_KERNEL);
880 ret = ERR_PTR(-ENOMEM);
884 max_id = TEE_NUM_DEVICES / 2;
886 if (teedesc->flags & TEE_DESC_PRIVILEGED) {
887 offs = TEE_NUM_DEVICES / 2;
888 max_id = TEE_NUM_DEVICES;
891 spin_lock(&driver_lock);
892 teedev->id = find_next_zero_bit(dev_mask, max_id, offs);
893 if (teedev->id < max_id)
894 set_bit(teedev->id, dev_mask);
895 spin_unlock(&driver_lock);
897 if (teedev->id >= max_id) {
898 ret = ERR_PTR(-ENOMEM);
902 snprintf(teedev->name, sizeof(teedev->name), "tee%s%d",
903 teedesc->flags & TEE_DESC_PRIVILEGED ? "priv" : "",
906 teedev->dev.class = tee_class;
907 teedev->dev.release = tee_release_device;
908 teedev->dev.parent = dev;
910 teedev->dev.devt = MKDEV(MAJOR(tee_devt), teedev->id);
912 rc = dev_set_name(&teedev->dev, "%s", teedev->name);
918 cdev_init(&teedev->cdev, &tee_fops);
919 teedev->cdev.owner = teedesc->owner;
920 teedev->cdev.kobj.parent = &teedev->dev.kobj;
922 dev_set_drvdata(&teedev->dev, driver_data);
923 device_initialize(&teedev->dev);
925 /* 1 as tee_device_unregister() does one final tee_device_put() */
926 teedev->num_users = 1;
927 init_completion(&teedev->c_no_users);
928 mutex_init(&teedev->mutex);
929 idr_init(&teedev->idr);
931 teedev->desc = teedesc;
936 unregister_chrdev_region(teedev->dev.devt, 1);
938 pr_err("could not register %s driver\n",
939 teedesc->flags & TEE_DESC_PRIVILEGED ? "privileged" : "client");
940 if (teedev && teedev->id < TEE_NUM_DEVICES) {
941 spin_lock(&driver_lock);
942 clear_bit(teedev->id, dev_mask);
943 spin_unlock(&driver_lock);
948 EXPORT_SYMBOL_GPL(tee_device_alloc);
950 static ssize_t implementation_id_show(struct device *dev,
951 struct device_attribute *attr, char *buf)
953 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
954 struct tee_ioctl_version_data vers;
956 teedev->desc->ops->get_version(teedev, &vers);
957 return scnprintf(buf, PAGE_SIZE, "%d\n", vers.impl_id);
959 static DEVICE_ATTR_RO(implementation_id);
961 static struct attribute *tee_dev_attrs[] = {
962 &dev_attr_implementation_id.attr,
966 static const struct attribute_group tee_dev_group = {
967 .attrs = tee_dev_attrs,
971 * tee_device_register() - Registers a TEE device
972 * @teedev: Device to register
974 * tee_device_unregister() need to be called to remove the @teedev if
975 * this function fails.
977 * @returns < 0 on failure
979 int tee_device_register(struct tee_device *teedev)
983 if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
984 dev_err(&teedev->dev, "attempt to register twice\n");
988 rc = cdev_add(&teedev->cdev, teedev->dev.devt, 1);
990 dev_err(&teedev->dev,
991 "unable to cdev_add() %s, major %d, minor %d, err=%d\n",
992 teedev->name, MAJOR(teedev->dev.devt),
993 MINOR(teedev->dev.devt), rc);
997 rc = device_add(&teedev->dev);
999 dev_err(&teedev->dev,
1000 "unable to device_add() %s, major %d, minor %d, err=%d\n",
1001 teedev->name, MAJOR(teedev->dev.devt),
1002 MINOR(teedev->dev.devt), rc);
1003 goto err_device_add;
1006 rc = sysfs_create_group(&teedev->dev.kobj, &tee_dev_group);
1008 dev_err(&teedev->dev,
1009 "failed to create sysfs attributes, err=%d\n", rc);
1010 goto err_sysfs_create_group;
1013 teedev->flags |= TEE_DEVICE_FLAG_REGISTERED;
1016 err_sysfs_create_group:
1017 device_del(&teedev->dev);
1019 cdev_del(&teedev->cdev);
1022 EXPORT_SYMBOL_GPL(tee_device_register);
1024 void tee_device_put(struct tee_device *teedev)
1026 mutex_lock(&teedev->mutex);
1027 /* Shouldn't put in this state */
1028 if (!WARN_ON(!teedev->desc)) {
1029 teedev->num_users--;
1030 if (!teedev->num_users) {
1031 teedev->desc = NULL;
1032 complete(&teedev->c_no_users);
1035 mutex_unlock(&teedev->mutex);
1038 bool tee_device_get(struct tee_device *teedev)
1040 mutex_lock(&teedev->mutex);
1041 if (!teedev->desc) {
1042 mutex_unlock(&teedev->mutex);
1045 teedev->num_users++;
1046 mutex_unlock(&teedev->mutex);
1051 * tee_device_unregister() - Removes a TEE device
1052 * @teedev: Device to unregister
1054 * This function should be called to remove the @teedev even if
1055 * tee_device_register() hasn't been called yet. Does nothing if
1058 void tee_device_unregister(struct tee_device *teedev)
1063 if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
1064 sysfs_remove_group(&teedev->dev.kobj, &tee_dev_group);
1065 cdev_del(&teedev->cdev);
1066 device_del(&teedev->dev);
1069 tee_device_put(teedev);
1070 wait_for_completion(&teedev->c_no_users);
1073 * No need to take a mutex any longer now since teedev->desc was
1074 * set to NULL before teedev->c_no_users was completed.
1077 teedev->pool = NULL;
1079 put_device(&teedev->dev);
1081 EXPORT_SYMBOL_GPL(tee_device_unregister);
1084 * tee_get_drvdata() - Return driver_data pointer
1085 * @teedev: Device containing the driver_data pointer
1086 * @returns the driver_data pointer supplied to tee_register().
1088 void *tee_get_drvdata(struct tee_device *teedev)
1090 return dev_get_drvdata(&teedev->dev);
1092 EXPORT_SYMBOL_GPL(tee_get_drvdata);
1094 struct match_dev_data {
1095 struct tee_ioctl_version_data *vers;
1097 int (*match)(struct tee_ioctl_version_data *, const void *);
1100 static int match_dev(struct device *dev, const void *data)
1102 const struct match_dev_data *match_data = data;
1103 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
1105 teedev->desc->ops->get_version(teedev, match_data->vers);
1106 return match_data->match(match_data->vers, match_data->data);
1109 struct tee_context *
1110 tee_client_open_context(struct tee_context *start,
1111 int (*match)(struct tee_ioctl_version_data *,
1113 const void *data, struct tee_ioctl_version_data *vers)
1115 struct device *dev = NULL;
1116 struct device *put_dev = NULL;
1117 struct tee_context *ctx = NULL;
1118 struct tee_ioctl_version_data v;
1119 struct match_dev_data match_data = { vers ? vers : &v, data, match };
1122 dev = &start->teedev->dev;
1125 dev = class_find_device(tee_class, dev, &match_data, match_dev);
1127 ctx = ERR_PTR(-ENOENT);
1131 put_device(put_dev);
1134 ctx = teedev_open(container_of(dev, struct tee_device, dev));
1135 } while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM);
1137 put_device(put_dev);
1139 * Default behaviour for in kernel client is to not wait for
1140 * tee-supplicant if not present for any requests in this context.
1141 * Also this flag could be configured again before call to
1142 * tee_client_open_session() if any in kernel client requires
1143 * different behaviour.
1146 ctx->supp_nowait = true;
1150 EXPORT_SYMBOL_GPL(tee_client_open_context);
1152 void tee_client_close_context(struct tee_context *ctx)
1154 teedev_close_context(ctx);
1156 EXPORT_SYMBOL_GPL(tee_client_close_context);
1158 void tee_client_get_version(struct tee_context *ctx,
1159 struct tee_ioctl_version_data *vers)
1161 ctx->teedev->desc->ops->get_version(ctx->teedev, vers);
1163 EXPORT_SYMBOL_GPL(tee_client_get_version);
1165 int tee_client_open_session(struct tee_context *ctx,
1166 struct tee_ioctl_open_session_arg *arg,
1167 struct tee_param *param)
1169 if (!ctx->teedev->desc->ops->open_session)
1171 return ctx->teedev->desc->ops->open_session(ctx, arg, param);
1173 EXPORT_SYMBOL_GPL(tee_client_open_session);
1175 int tee_client_close_session(struct tee_context *ctx, u32 session)
1177 if (!ctx->teedev->desc->ops->close_session)
1179 return ctx->teedev->desc->ops->close_session(ctx, session);
1181 EXPORT_SYMBOL_GPL(tee_client_close_session);
1183 int tee_client_invoke_func(struct tee_context *ctx,
1184 struct tee_ioctl_invoke_arg *arg,
1185 struct tee_param *param)
1187 if (!ctx->teedev->desc->ops->invoke_func)
1189 return ctx->teedev->desc->ops->invoke_func(ctx, arg, param);
1191 EXPORT_SYMBOL_GPL(tee_client_invoke_func);
1193 int tee_client_cancel_req(struct tee_context *ctx,
1194 struct tee_ioctl_cancel_arg *arg)
1196 if (!ctx->teedev->desc->ops->cancel_req)
1198 return ctx->teedev->desc->ops->cancel_req(ctx, arg->cancel_id,
1202 static int tee_client_device_match(struct device *dev,
1203 struct device_driver *drv)
1205 const struct tee_client_device_id *id_table;
1206 struct tee_client_device *tee_device;
1208 id_table = to_tee_client_driver(drv)->id_table;
1209 tee_device = to_tee_client_device(dev);
1211 while (!uuid_is_null(&id_table->uuid)) {
1212 if (uuid_equal(&tee_device->id.uuid, &id_table->uuid))
1220 static int tee_client_device_uevent(struct device *dev,
1221 struct kobj_uevent_env *env)
1223 uuid_t *dev_id = &to_tee_client_device(dev)->id.uuid;
1225 return add_uevent_var(env, "MODALIAS=tee:%pUb", dev_id);
1228 struct bus_type tee_bus_type = {
1230 .match = tee_client_device_match,
1231 .uevent = tee_client_device_uevent,
1233 EXPORT_SYMBOL_GPL(tee_bus_type);
1235 static int __init tee_init(void)
1239 tee_class = class_create(THIS_MODULE, "tee");
1240 if (IS_ERR(tee_class)) {
1241 pr_err("couldn't create class\n");
1242 return PTR_ERR(tee_class);
1245 rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee");
1247 pr_err("failed to allocate char dev region\n");
1248 goto out_unreg_class;
1251 rc = bus_register(&tee_bus_type);
1253 pr_err("failed to register tee bus\n");
1254 goto out_unreg_chrdev;
1260 unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
1262 class_destroy(tee_class);
1268 static void __exit tee_exit(void)
1270 bus_unregister(&tee_bus_type);
1271 unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
1272 class_destroy(tee_class);
1276 subsys_initcall(tee_init);
1277 module_exit(tee_exit);
1279 MODULE_AUTHOR("Linaro");
1280 MODULE_DESCRIPTION("TEE Driver");
1281 MODULE_VERSION("1.0");
1282 MODULE_LICENSE("GPL v2");