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author | Claudio Carvalho <cclaudio@linux.vnet.ibm.com> | 2017-12-09 02:52:30 -0200 |
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committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-12-18 21:30:57 -0600 |
commit | 7da364fd3646013166b90baf26fc55078a446a21 (patch) | |
tree | c188bfef58d9ea7c0885efb2fd9bfa6e0318dbb9 /hdata/tpmrel.c | |
parent | 48fd73cfc7073911a1ecdf0ff62e1800ef544d2a (diff) | |
download | skiboot-7da364fd3646013166b90baf26fc55078a446a21.zip skiboot-7da364fd3646013166b90baf26fc55078a446a21.tar.gz skiboot-7da364fd3646013166b90baf26fc55078a446a21.tar.bz2 |
hdata/tpmrel.c: add firmware event log info to the tpm node
This parses the firmware event log information from the
secureboot_tpm_info HDAT structure and add it to the tpm device tree
node.
There can be multiple secureboot_tpm_info entries with each entry
corresponding to a master processor that has a tpm device, however,
multiple tpm is not supported.
Signed-off-by: Claudio Carvalho <cclaudio@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'hdata/tpmrel.c')
-rw-r--r-- | hdata/tpmrel.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/hdata/tpmrel.c b/hdata/tpmrel.c new file mode 100644 index 0000000..5b6731f --- /dev/null +++ b/hdata/tpmrel.c @@ -0,0 +1,116 @@ +/* Copyright 2013-2017 IBM Corp. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or + * implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef pr_fmt +#define pr_fmt(fmt) "TPMREL: " fmt +#endif + +#include <skiboot.h> +#include <device.h> + +#include "spira.h" +#include "hdata.h" +#include "hdif.h" + +static void tpmrel_add_firmware_event_log(const struct HDIF_common_hdr *hdif_hdr) +{ + const struct secureboot_tpm_info *stinfo; + struct dt_node *xscom, *node; + uint64_t addr; + int count, i; + unsigned int asize; + + /* Are the hdat values populated? */ + if (!HDIF_get_idata(hdif_hdr, TPMREL_IDATA_SECUREBOOT_TPM_INFO, &asize)) + return; + if (asize < sizeof(struct HDIF_array_hdr)) { + prlog(PR_ERR, "secureboot_tpm_info idata not populated\n"); + return; + } + + count = HDIF_get_iarray_size(hdif_hdr, TPMREL_IDATA_SECUREBOOT_TPM_INFO); + if (count > 1) { + prlog(PR_ERR, "multiple TPM not supported, count=%d\n", count); + return; + } + + /* + * There can be multiple secureboot_tpm_info entries with each entry + * corresponding to a master processor that has a tpm device. + * This looks for the tpm node that supposedly exists under the xscom + * node associated with the respective chip_id. + */ + for (i = 0; i < count; i++) { + + stinfo = HDIF_get_iarray_item(hdif_hdr, + TPMREL_IDATA_SECUREBOOT_TPM_INFO, + i, NULL); + + xscom = find_xscom_for_chip(be32_to_cpu(stinfo->chip_id)); + if (xscom) { + dt_for_each_node(xscom, node) { + if (dt_has_node_property(node, "label", "tpm")) + break; + } + + if (node) { + addr = (uint64_t) stinfo + + be32_to_cpu(stinfo->srtm_log_offset); + dt_add_property_u64s(node, "linux,sml-base", addr); + dt_add_property_cells(node, "linux,sml-size", + be32_to_cpu(stinfo->srtm_log_size)); + + if (stinfo->tpm_status == TPM_PRESENT_AND_NOT_FUNCTIONAL) + dt_add_property_string(node, "status", "disabled"); + } else { + /** + * @fwts-label HDATNoTpmForChipId + * @fwts-advice HDAT secureboot_tpm_info + * structure described a chip id, but no tpm + * node was found under that xscom chip id. + * This is most certainly a hostboot bug. + */ + prlog(PR_ERR, "TPM node not found for " + "chip_id=%d (HB bug)\n", stinfo->chip_id); + continue; + } + } else { + /** + * @fwts-label HDATBadChipIdForTPM + * @fwts-advice HDAT secureboot_tpm_info structure + * described a chip id, but the xscom node for the + * chip_id was not found. + * This is most certainly a firmware bug. + */ + prlog(PR_ERR, "xscom node not found for chip_id=%d\n", + stinfo->chip_id); + continue; + } + } +} + +void node_stb_parse(void) +{ + struct HDIF_common_hdr *hdif_hdr; + + hdif_hdr = get_hdif(&spira.ntuples.node_stb_data, "TPMREL"); + if (!hdif_hdr) { + prlog(PR_DEBUG, "TPMREL data not found\n"); + return; + } + + tpmrel_add_firmware_event_log(hdif_hdr); +} |