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![Simon Glass](/assets/img/avatar_default.png)
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
252 lines
6.2 KiB
C
252 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) Microsoft Corporation
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*
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* Authors:
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* Thirupathaiah Annapureddy <thiruan@microsoft.com>
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*
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* Description:
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* Device Driver for a firmware TPM as described here:
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* https://www.microsoft.com/en-us/research/publication/ftpm-software-implementation-tpm-chip/
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*
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* A reference implementation is available here:
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* https://github.com/microsoft/ms-tpm-20-ref/tree/master/Samples/ARM32-FirmwareTPM/optee_ta/fTPM
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*/
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#include <common.h>
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#include <dm.h>
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#include <log.h>
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#include <tpm-v2.h>
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#include <tee.h>
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#include "tpm_tis.h"
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#include "tpm2_ftpm_tee.h"
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/**
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* ftpm_tee_transceive() - send fTPM commands and retrieve fTPM response.
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* @sendbuf - address of the data to send, byte by byte
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* @send_size - length of the data to send
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* @recvbuf - address where to read the response, byte by byte.
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* @recv_len - pointer to the size of buffer
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*
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* Return:
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* In case of success, returns 0.
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* On failure, -errno
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*/
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static int ftpm_tee_transceive(struct udevice *dev, const u8 *sendbuf,
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size_t send_size, u8 *recvbuf,
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size_t *recv_len)
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{
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struct ftpm_tee_private *context = dev_get_priv(dev);
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int rc = 0;
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size_t resp_len;
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u8 *resp_buf;
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struct tpm_output_header *resp_header;
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struct tee_invoke_arg transceive_args;
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struct tee_param command_params[4];
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struct tee_shm *shm;
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if (send_size > MAX_COMMAND_SIZE) {
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debug("%s:send_size=%zd exceeds MAX_COMMAND_SIZE\n",
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__func__, send_size);
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return -EIO;
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}
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shm = context->shm;
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memset(&transceive_args, 0, sizeof(transceive_args));
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memset(command_params, 0, sizeof(command_params));
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/* Invoke FTPM_OPTEE_TA_SUBMIT_COMMAND function of fTPM TA */
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transceive_args = (struct tee_invoke_arg) {
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.func = FTPM_OPTEE_TA_SUBMIT_COMMAND,
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.session = context->session,
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};
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/* Fill FTPM_OPTEE_TA_SUBMIT_COMMAND parameters */
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/* request */
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command_params[0] = (struct tee_param) {
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.attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT,
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.u.memref = {
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.shm = shm,
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.size = send_size,
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.shm_offs = 0,
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},
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};
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memset(command_params[0].u.memref.shm->addr, 0,
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(MAX_COMMAND_SIZE + MAX_RESPONSE_SIZE));
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memcpy(command_params[0].u.memref.shm->addr, sendbuf, send_size);
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/* response */
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command_params[1] = (struct tee_param) {
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.attr = TEE_PARAM_ATTR_TYPE_MEMREF_INOUT,
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.u.memref = {
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.shm = shm,
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.size = MAX_RESPONSE_SIZE,
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.shm_offs = MAX_COMMAND_SIZE,
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},
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};
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rc = tee_invoke_func(context->tee_dev, &transceive_args, 4,
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command_params);
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if ((rc < 0) || (transceive_args.ret != 0)) {
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debug("%s:SUBMIT_COMMAND invoke error: 0x%x\n",
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__func__, transceive_args.ret);
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return (rc < 0) ? rc : transceive_args.ret;
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}
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resp_buf = command_params[1].u.memref.shm->addr +
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command_params[1].u.memref.shm_offs;
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resp_header = (struct tpm_output_header *)resp_buf;
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resp_len = be32_to_cpu(resp_header->length);
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/* sanity check resp_len*/
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if (resp_len < TPM_HEADER_SIZE) {
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debug("%s:tpm response header too small\n", __func__);
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return -EIO;
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}
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if (resp_len > MAX_RESPONSE_SIZE) {
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debug("%s:resp_len=%zd exceeds MAX_RESPONSE_SIZE\n",
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__func__, resp_len);
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return -EIO;
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}
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if (resp_len > *recv_len) {
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debug("%s:response length is bigger than receive buffer\n",
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__func__);
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return -EIO;
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}
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/* sanity checks look good, copy the response */
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memcpy(recvbuf, resp_buf, resp_len);
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*recv_len = resp_len;
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return 0;
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}
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static int ftpm_tee_open(struct udevice *dev)
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{
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struct ftpm_tee_private *context = dev_get_priv(dev);
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if (context->is_open)
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return -EBUSY;
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context->is_open = 1;
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return 0;
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}
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static int ftpm_tee_close(struct udevice *dev)
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{
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struct ftpm_tee_private *context = dev_get_priv(dev);
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if (context->is_open)
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context->is_open = 0;
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return 0;
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}
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static int ftpm_tee_desc(struct udevice *dev, char *buf, int size)
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{
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if (size < 32)
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return -ENOSPC;
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return snprintf(buf, size, "Microsoft OP-TEE fTPM");
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}
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static int ftpm_tee_match(struct tee_version_data *vers, const void *data)
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{
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debug("%s:vers->gen_caps =0x%x\n", __func__, vers->gen_caps);
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/*
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* Currently this driver only support GP Complaint OPTEE based fTPM TA
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*/
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return vers->gen_caps & TEE_GEN_CAP_GP;
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}
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static int ftpm_tee_probe(struct udevice *dev)
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{
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int rc;
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struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
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struct ftpm_tee_private *context = dev_get_priv(dev);
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struct tee_open_session_arg sess_arg;
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const struct tee_optee_ta_uuid uuid = TA_FTPM_UUID;
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memset(context, 0, sizeof(*context));
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/* Use the TPM v2 stack */
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priv->version = TPM_V2;
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priv->pcr_count = 24;
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priv->pcr_select_min = 3;
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/* Find TEE device */
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context->tee_dev = tee_find_device(NULL, ftpm_tee_match, NULL, NULL);
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if (!context->tee_dev) {
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debug("%s:tee_find_device failed\n", __func__);
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return -ENODEV;
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}
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/* Open a session with the fTPM TA */
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memset(&sess_arg, 0, sizeof(sess_arg));
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tee_optee_ta_uuid_to_octets(sess_arg.uuid, &uuid);
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rc = tee_open_session(context->tee_dev, &sess_arg, 0, NULL);
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if ((rc < 0) || (sess_arg.ret != 0)) {
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debug("%s:tee_open_session failed, err=%x\n",
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__func__, sess_arg.ret);
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return -EIO;
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}
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context->session = sess_arg.session;
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/* Allocate dynamic shared memory with fTPM TA */
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rc = tee_shm_alloc(context->tee_dev,
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MAX_COMMAND_SIZE + MAX_RESPONSE_SIZE,
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0, &context->shm);
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if (rc) {
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debug("%s:tee_shm_alloc failed with rc = %d\n", __func__, rc);
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goto out_shm_alloc;
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}
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return 0;
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out_shm_alloc:
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tee_close_session(context->tee_dev, context->session);
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return rc;
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}
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static int ftpm_tee_remove(struct udevice *dev)
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{
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struct ftpm_tee_private *context = dev_get_priv(dev);
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int rc;
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/* tee_pre_remove frees any leftover TEE shared memory */
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/* close the existing session with fTPM TA*/
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rc = tee_close_session(context->tee_dev, context->session);
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debug("%s: tee_close_session - rc =%d\n", __func__, rc);
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return 0;
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}
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static const struct tpm_ops ftpm_tee_ops = {
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.open = ftpm_tee_open,
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.close = ftpm_tee_close,
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.get_desc = ftpm_tee_desc,
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.xfer = ftpm_tee_transceive,
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};
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static const struct udevice_id ftpm_tee_ids[] = {
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{ .compatible = "microsoft,ftpm" },
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{ }
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};
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U_BOOT_DRIVER(ftpm_tee) = {
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.name = "ftpm_tee",
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.id = UCLASS_TPM,
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.of_match = ftpm_tee_ids,
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.ops = &ftpm_tee_ops,
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.probe = ftpm_tee_probe,
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.remove = ftpm_tee_remove,
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.flags = DM_FLAG_OS_PREPARE,
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.priv_auto = sizeof(struct ftpm_tee_private),
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};
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