1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2015-2021, Linaro Limited 4 * Copyright (c) 2016, EPAM Systems 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/crash_dump.h> 10 #include <linux/errno.h> 11 #include <linux/io.h> 12 #include <linux/mm.h> 13 #include <linux/module.h> 14 #include <linux/slab.h> 15 #include <linux/string.h> 16 #include <linux/tee_drv.h> 17 #include <linux/types.h> 18 #include <linux/workqueue.h> 19 #include "optee_private.h" 20 21 int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm, 22 struct tee_shm *shm, size_t size, 23 int (*shm_register)(struct tee_context *ctx, 24 struct tee_shm *shm, 25 struct page **pages, 26 size_t num_pages, 27 unsigned long start)) 28 { 29 unsigned int order = get_order(size); 30 struct page *page; 31 int rc = 0; 32 33 page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); 34 if (!page) 35 return -ENOMEM; 36 37 shm->kaddr = page_address(page); 38 shm->paddr = page_to_phys(page); 39 shm->size = PAGE_SIZE << order; 40 41 if (shm_register) { 42 unsigned int nr_pages = 1 << order, i; 43 struct page **pages; 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] = page + i; 53 54 shm->flags |= TEE_SHM_REGISTER; 55 rc = shm_register(shm->ctx, shm, pages, nr_pages, 56 (unsigned long)shm->kaddr); 57 kfree(pages); 58 if (rc) 59 goto err; 60 } 61 62 return 0; 63 64 err: 65 __free_pages(page, order); 66 return rc; 67 } 68 69 static void optee_bus_scan(struct work_struct *work) 70 { 71 WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP)); 72 } 73 74 int optee_open(struct tee_context *ctx, bool cap_memref_null) 75 { 76 struct optee_context_data *ctxdata; 77 struct tee_device *teedev = ctx->teedev; 78 struct optee *optee = tee_get_drvdata(teedev); 79 80 ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL); 81 if (!ctxdata) 82 return -ENOMEM; 83 84 if (teedev == optee->supp_teedev) { 85 bool busy = true; 86 87 mutex_lock(&optee->supp.mutex); 88 if (!optee->supp.ctx) { 89 busy = false; 90 optee->supp.ctx = ctx; 91 } 92 mutex_unlock(&optee->supp.mutex); 93 if (busy) { 94 kfree(ctxdata); 95 return -EBUSY; 96 } 97 98 if (!optee->scan_bus_done) { 99 INIT_WORK(&optee->scan_bus_work, optee_bus_scan); 100 optee->scan_bus_wq = create_workqueue("optee_bus_scan"); 101 if (!optee->scan_bus_wq) { 102 kfree(ctxdata); 103 return -ECHILD; 104 } 105 queue_work(optee->scan_bus_wq, &optee->scan_bus_work); 106 optee->scan_bus_done = true; 107 } 108 } 109 mutex_init(&ctxdata->mutex); 110 INIT_LIST_HEAD(&ctxdata->sess_list); 111 112 ctx->cap_memref_null = cap_memref_null; 113 ctx->data = ctxdata; 114 return 0; 115 } 116 117 static void optee_release_helper(struct tee_context *ctx, 118 int (*close_session)(struct tee_context *ctx, 119 u32 session)) 120 { 121 struct optee_context_data *ctxdata = ctx->data; 122 struct optee_session *sess; 123 struct optee_session *sess_tmp; 124 125 if (!ctxdata) 126 return; 127 128 list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list, 129 list_node) { 130 list_del(&sess->list_node); 131 close_session(ctx, sess->session_id); 132 kfree(sess); 133 } 134 kfree(ctxdata); 135 ctx->data = NULL; 136 } 137 138 void optee_release(struct tee_context *ctx) 139 { 140 optee_release_helper(ctx, optee_close_session_helper); 141 } 142 143 void optee_release_supp(struct tee_context *ctx) 144 { 145 struct optee *optee = tee_get_drvdata(ctx->teedev); 146 147 optee_release_helper(ctx, optee_close_session_helper); 148 if (optee->scan_bus_wq) { 149 destroy_workqueue(optee->scan_bus_wq); 150 optee->scan_bus_wq = NULL; 151 } 152 optee_supp_release(&optee->supp); 153 } 154 155 void optee_remove_common(struct optee *optee) 156 { 157 /* Unregister OP-TEE specific client devices on TEE bus */ 158 optee_unregister_devices(); 159 160 optee_notif_uninit(optee); 161 /* 162 * The two devices have to be unregistered before we can free the 163 * other resources. 164 */ 165 tee_device_unregister(optee->supp_teedev); 166 tee_device_unregister(optee->teedev); 167 168 tee_shm_pool_free(optee->pool); 169 optee_supp_uninit(&optee->supp); 170 mutex_destroy(&optee->call_queue.mutex); 171 } 172 173 static int smc_abi_rc; 174 static int ffa_abi_rc; 175 176 static int optee_core_init(void) 177 { 178 /* 179 * The kernel may have crashed at the same time that all available 180 * secure world threads were suspended and we cannot reschedule the 181 * suspended threads without access to the crashed kernel's wait_queue. 182 * Therefore, we cannot reliably initialize the OP-TEE driver in the 183 * kdump kernel. 184 */ 185 if (is_kdump_kernel()) 186 return -ENODEV; 187 188 smc_abi_rc = optee_smc_abi_register(); 189 ffa_abi_rc = optee_ffa_abi_register(); 190 191 /* If both failed there's no point with this module */ 192 if (smc_abi_rc && ffa_abi_rc) 193 return smc_abi_rc; 194 return 0; 195 } 196 module_init(optee_core_init); 197 198 static void optee_core_exit(void) 199 { 200 if (!smc_abi_rc) 201 optee_smc_abi_unregister(); 202 if (!ffa_abi_rc) 203 optee_ffa_abi_unregister(); 204 } 205 module_exit(optee_core_exit); 206 207 MODULE_AUTHOR("Linaro"); 208 MODULE_DESCRIPTION("OP-TEE driver"); 209 MODULE_VERSION("1.0"); 210 MODULE_LICENSE("GPL v2"); 211 MODULE_ALIAS("platform:optee"); 212