161 lines
3.8 KiB
C
161 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2019 Linaro Ltd.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/tee_drv.h>
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#include <linux/uuid.h>
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#include "optee_private.h"
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/*
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* Get device UUIDs
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*
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* [out] memref[0] Array of device UUIDs
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*
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* Return codes:
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* TEE_SUCCESS - Invoke command success
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* TEE_ERROR_BAD_PARAMETERS - Incorrect input param
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* TEE_ERROR_SHORT_BUFFER - Output buffer size less than required
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*/
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#define PTA_CMD_GET_DEVICES 0x0
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static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
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{
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if (ver->impl_id == TEE_IMPL_ID_OPTEE)
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return 1;
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else
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return 0;
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}
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static int get_devices(struct tee_context *ctx, u32 session,
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struct tee_shm *device_shm, u32 *shm_size)
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{
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int ret = 0;
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struct tee_ioctl_invoke_arg inv_arg;
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struct tee_param param[4];
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memset(&inv_arg, 0, sizeof(inv_arg));
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memset(¶m, 0, sizeof(param));
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/* Invoke PTA_CMD_GET_DEVICES function */
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inv_arg.func = PTA_CMD_GET_DEVICES;
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inv_arg.session = session;
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inv_arg.num_params = 4;
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/* Fill invoke cmd params */
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param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT;
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param[0].u.memref.shm = device_shm;
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param[0].u.memref.size = *shm_size;
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param[0].u.memref.shm_offs = 0;
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ret = tee_client_invoke_func(ctx, &inv_arg, param);
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if ((ret < 0) || ((inv_arg.ret != TEEC_SUCCESS) &&
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(inv_arg.ret != TEEC_ERROR_SHORT_BUFFER))) {
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pr_err("PTA_CMD_GET_DEVICES invoke function err: %x\n",
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inv_arg.ret);
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return -EINVAL;
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}
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*shm_size = param[0].u.memref.size;
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return 0;
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}
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static int optee_register_device(const uuid_t *device_uuid, u32 device_id)
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{
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struct tee_client_device *optee_device = NULL;
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int rc;
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optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
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if (!optee_device)
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return -ENOMEM;
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optee_device->dev.bus = &tee_bus_type;
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dev_set_name(&optee_device->dev, "optee-clnt%u", device_id);
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uuid_copy(&optee_device->id.uuid, device_uuid);
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rc = device_register(&optee_device->dev);
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if (rc) {
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pr_err("device registration failed, err: %d\n", rc);
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kfree(optee_device);
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}
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return rc;
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}
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int optee_enumerate_devices(void)
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{
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const uuid_t pta_uuid =
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UUID_INIT(0x7011a688, 0xddde, 0x4053,
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0xa5, 0xa9, 0x7b, 0x3c, 0x4d, 0xdf, 0x13, 0xb8);
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struct tee_ioctl_open_session_arg sess_arg;
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struct tee_shm *device_shm = NULL;
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const uuid_t *device_uuid = NULL;
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struct tee_context *ctx = NULL;
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u32 shm_size = 0, idx, num_devices = 0;
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int rc;
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memset(&sess_arg, 0, sizeof(sess_arg));
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/* Open context with OP-TEE driver */
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ctx = tee_client_open_context(NULL, optee_ctx_match, NULL, NULL);
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if (IS_ERR(ctx))
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return -ENODEV;
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/* Open session with device enumeration pseudo TA */
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memcpy(sess_arg.uuid, pta_uuid.b, TEE_IOCTL_UUID_LEN);
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sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
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sess_arg.num_params = 0;
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rc = tee_client_open_session(ctx, &sess_arg, NULL);
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if ((rc < 0) || (sess_arg.ret != TEEC_SUCCESS)) {
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/* Device enumeration pseudo TA not found */
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rc = 0;
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goto out_ctx;
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}
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rc = get_devices(ctx, sess_arg.session, NULL, &shm_size);
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if (rc < 0 || !shm_size)
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goto out_sess;
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device_shm = tee_shm_alloc(ctx, shm_size,
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TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
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if (IS_ERR(device_shm)) {
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pr_err("tee_shm_alloc failed\n");
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rc = PTR_ERR(device_shm);
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goto out_sess;
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}
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rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size);
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if (rc < 0)
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goto out_shm;
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device_uuid = tee_shm_get_va(device_shm, 0);
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if (IS_ERR(device_uuid)) {
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pr_err("tee_shm_get_va failed\n");
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rc = PTR_ERR(device_uuid);
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goto out_shm;
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}
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num_devices = shm_size / sizeof(uuid_t);
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for (idx = 0; idx < num_devices; idx++) {
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rc = optee_register_device(&device_uuid[idx], idx);
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if (rc)
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goto out_shm;
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}
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out_shm:
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tee_shm_free(device_shm);
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out_sess:
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tee_client_close_session(ctx, sess_arg.session);
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out_ctx:
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tee_client_close_context(ctx);
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return rc;
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}
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