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; 53 page++; 54 } 55 56 shm->flags |= TEE_SHM_REGISTER; 57 rc = shm_register(shm->ctx, shm, pages, nr_pages, 58 (unsigned long)shm->kaddr); 59 kfree(pages); 60 if (rc) 61 goto err; 62 } 63 64 return 0; 65 66 err: 67 __free_pages(page, order); 68 return rc; 69 } 70 71 static void optee_bus_scan(struct work_struct *work) 72 { 73 WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP)); 74 } 75 76 int optee_open(struct tee_context *ctx, bool cap_memref_null) 77 { 78 struct optee_context_data *ctxdata; 79 struct tee_device *teedev = ctx->teedev; 80 struct optee *optee = tee_get_drvdata(teedev); 81 82 ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL); 83 if (!ctxdata) 84 return -ENOMEM; 85 86 if (teedev == optee->supp_teedev) { 87 bool busy = true; 88 89 mutex_lock(&optee->supp.mutex); 90 if (!optee->supp.ctx) { 91 busy = false; 92 optee->supp.ctx = ctx; 93 } 94 mutex_unlock(&optee->supp.mutex); 95 if (busy) { 96 kfree(ctxdata); 97 return -EBUSY; 98 } 99 100 if (!optee->scan_bus_done) { 101 INIT_WORK(&optee->scan_bus_work, optee_bus_scan); 102 optee->scan_bus_wq = create_workqueue("optee_bus_scan"); 103 if (!optee->scan_bus_wq) { 104 kfree(ctxdata); 105 return -ECHILD; 106 } 107 queue_work(optee->scan_bus_wq, &optee->scan_bus_work); 108 optee->scan_bus_done = true; 109 } 110 } 111 mutex_init(&ctxdata->mutex); 112 INIT_LIST_HEAD(&ctxdata->sess_list); 113 114 ctx->cap_memref_null = cap_memref_null; 115 ctx->data = ctxdata; 116 return 0; 117 } 118 119 static void optee_release_helper(struct tee_context *ctx, 120 int (*close_session)(struct tee_context *ctx, 121 u32 session)) 122 { 123 struct optee_context_data *ctxdata = ctx->data; 124 struct optee_session *sess; 125 struct optee_session *sess_tmp; 126 127 if (!ctxdata) 128 return; 129 130 list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list, 131 list_node) { 132 list_del(&sess->list_node); 133 close_session(ctx, sess->session_id); 134 kfree(sess); 135 } 136 kfree(ctxdata); 137 ctx->data = NULL; 138 } 139 140 void optee_release(struct tee_context *ctx) 141 { 142 optee_release_helper(ctx, optee_close_session_helper); 143 } 144 145 void optee_release_supp(struct tee_context *ctx) 146 { 147 struct optee *optee = tee_get_drvdata(ctx->teedev); 148 149 optee_release_helper(ctx, optee_close_session_helper); 150 if (optee->scan_bus_wq) { 151 destroy_workqueue(optee->scan_bus_wq); 152 optee->scan_bus_wq = NULL; 153 } 154 optee_supp_release(&optee->supp); 155 } 156 157 void optee_remove_common(struct optee *optee) 158 { 159 /* Unregister OP-TEE specific client devices on TEE bus */ 160 optee_unregister_devices(); 161 162 /* 163 * The two devices have to be unregistered before we can free the 164 * other resources. 165 */ 166 tee_device_unregister(optee->supp_teedev); 167 tee_device_unregister(optee->teedev); 168 169 tee_shm_pool_free(optee->pool); 170 optee_wait_queue_exit(&optee->wait_queue); 171 optee_supp_uninit(&optee->supp); 172 mutex_destroy(&optee->call_queue.mutex); 173 } 174 175 static int smc_abi_rc; 176 static int ffa_abi_rc; 177 178 static int optee_core_init(void) 179 { 180 /* 181 * The kernel may have crashed at the same time that all available 182 * secure world threads were suspended and we cannot reschedule the 183 * suspended threads without access to the crashed kernel's wait_queue. 184 * Therefore, we cannot reliably initialize the OP-TEE driver in the 185 * kdump kernel. 186 */ 187 if (is_kdump_kernel()) 188 return -ENODEV; 189 190 smc_abi_rc = optee_smc_abi_register(); 191 ffa_abi_rc = optee_ffa_abi_register(); 192 193 /* If both failed there's no point with this module */ 194 if (smc_abi_rc && ffa_abi_rc) 195 return smc_abi_rc; 196 return 0; 197 } 198 module_init(optee_core_init); 199 200 static void optee_core_exit(void) 201 { 202 if (!smc_abi_rc) 203 optee_smc_abi_unregister(); 204 if (!ffa_abi_rc) 205 optee_ffa_abi_unregister(); 206 } 207 module_exit(optee_core_exit); 208 209 MODULE_AUTHOR("Linaro"); 210 MODULE_DESCRIPTION("OP-TEE driver"); 211 MODULE_VERSION("1.0"); 212 MODULE_LICENSE("GPL v2"); 213 MODULE_ALIAS("platform:optee"); 214