1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2019 Linaro Ltd. 4 */ 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/kernel.h> 9 #include <linux/slab.h> 10 #include <linux/tee_drv.h> 11 #include <linux/uuid.h> 12 #include "optee_private.h" 13 14 static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data) 15 { 16 if (ver->impl_id == TEE_IMPL_ID_OPTEE) 17 return 1; 18 else 19 return 0; 20 } 21 22 static int get_devices(struct tee_context *ctx, u32 session, 23 struct tee_shm *device_shm, u32 *shm_size, 24 u32 func) 25 { 26 int ret = 0; 27 struct tee_ioctl_invoke_arg inv_arg; 28 struct tee_param param[4]; 29 30 memset(&inv_arg, 0, sizeof(inv_arg)); 31 memset(¶m, 0, sizeof(param)); 32 33 inv_arg.func = func; 34 inv_arg.session = session; 35 inv_arg.num_params = 4; 36 37 /* Fill invoke cmd params */ 38 param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT; 39 param[0].u.memref.shm = device_shm; 40 param[0].u.memref.size = *shm_size; 41 param[0].u.memref.shm_offs = 0; 42 43 ret = tee_client_invoke_func(ctx, &inv_arg, param); 44 if ((ret < 0) || ((inv_arg.ret != TEEC_SUCCESS) && 45 (inv_arg.ret != TEEC_ERROR_SHORT_BUFFER))) { 46 pr_err("PTA_CMD_GET_DEVICES invoke function err: %x\n", 47 inv_arg.ret); 48 return -EINVAL; 49 } 50 51 *shm_size = param[0].u.memref.size; 52 53 return 0; 54 } 55 56 static int optee_register_device(const uuid_t *device_uuid) 57 { 58 struct tee_client_device *optee_device = NULL; 59 int rc; 60 61 optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL); 62 if (!optee_device) 63 return -ENOMEM; 64 65 optee_device->dev.bus = &tee_bus_type; 66 if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) { 67 kfree(optee_device); 68 return -ENOMEM; 69 } 70 uuid_copy(&optee_device->id.uuid, device_uuid); 71 72 rc = device_register(&optee_device->dev); 73 if (rc) { 74 pr_err("device registration failed, err: %d\n", rc); 75 kfree(optee_device); 76 } 77 78 return rc; 79 } 80 81 static int __optee_enumerate_devices(u32 func) 82 { 83 const uuid_t pta_uuid = 84 UUID_INIT(0x7011a688, 0xddde, 0x4053, 85 0xa5, 0xa9, 0x7b, 0x3c, 0x4d, 0xdf, 0x13, 0xb8); 86 struct tee_ioctl_open_session_arg sess_arg; 87 struct tee_shm *device_shm = NULL; 88 const uuid_t *device_uuid = NULL; 89 struct tee_context *ctx = NULL; 90 u32 shm_size = 0, idx, num_devices = 0; 91 int rc; 92 93 memset(&sess_arg, 0, sizeof(sess_arg)); 94 95 /* Open context with OP-TEE driver */ 96 ctx = tee_client_open_context(NULL, optee_ctx_match, NULL, NULL); 97 if (IS_ERR(ctx)) 98 return -ENODEV; 99 100 /* Open session with device enumeration pseudo TA */ 101 export_uuid(sess_arg.uuid, &pta_uuid); 102 sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC; 103 sess_arg.num_params = 0; 104 105 rc = tee_client_open_session(ctx, &sess_arg, NULL); 106 if ((rc < 0) || (sess_arg.ret != TEEC_SUCCESS)) { 107 /* Device enumeration pseudo TA not found */ 108 rc = 0; 109 goto out_ctx; 110 } 111 112 rc = get_devices(ctx, sess_arg.session, NULL, &shm_size, func); 113 if (rc < 0 || !shm_size) 114 goto out_sess; 115 116 device_shm = tee_shm_alloc(ctx, shm_size, 117 TEE_SHM_MAPPED | TEE_SHM_DMA_BUF); 118 if (IS_ERR(device_shm)) { 119 pr_err("tee_shm_alloc failed\n"); 120 rc = PTR_ERR(device_shm); 121 goto out_sess; 122 } 123 124 rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size, func); 125 if (rc < 0) 126 goto out_shm; 127 128 device_uuid = tee_shm_get_va(device_shm, 0); 129 if (IS_ERR(device_uuid)) { 130 pr_err("tee_shm_get_va failed\n"); 131 rc = PTR_ERR(device_uuid); 132 goto out_shm; 133 } 134 135 num_devices = shm_size / sizeof(uuid_t); 136 137 for (idx = 0; idx < num_devices; idx++) { 138 rc = optee_register_device(&device_uuid[idx]); 139 if (rc) 140 goto out_shm; 141 } 142 143 out_shm: 144 tee_shm_free(device_shm); 145 out_sess: 146 tee_client_close_session(ctx, sess_arg.session); 147 out_ctx: 148 tee_client_close_context(ctx); 149 150 return rc; 151 } 152 153 int optee_enumerate_devices(u32 func) 154 { 155 return __optee_enumerate_devices(func); 156 } 157