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/* 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);
/*
* If tpm is not present, hostboot creates an empty
* secureboot_tpm_info entry, but setting
* tpm_status=TPM_NOT_PRESENT
*/
if (stinfo->tpm_status == TPM_NOT_PRESENT)
continue;
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;
}
}
}
static struct dt_node *get_hb_reserved_memory(const char *label)
{
struct dt_node *node, *hb_reserved_mem;
hb_reserved_mem = dt_find_by_path(dt_root, "/ibm,hostboot/reserved-memory");
if (!hb_reserved_mem) {
prlog(PR_DEBUG, "/ibm,hostboot/reserved-memory node not found\n");
return NULL;
}
dt_for_each_node(hb_reserved_mem, node) {
const char *prd_label;
if (!dt_find_property(node, "ibm,prd-label"))
continue;
prd_label = dt_prop_get(node, "ibm,prd-label");
if (!strcmp(prd_label, label))
return node;
}
return NULL;
}
struct {
uint32_t type;
const char *compat;
} cvc_services[] = {
{ TPMREL_HV_SHA512, "ibm,cvc-sha512" },
{ TPMREL_HV_VERIFY, "ibm,cvc-verify" },
};
static const char* cvc_service_map_compat(uint32_t type) {
int i;
for (i = 0; i < ARRAY_SIZE(cvc_services); i++) {
if (cvc_services[i].type == type)
return cvc_services[i].compat;
}
return NULL;
}
static void tpmrel_cvc_init(struct HDIF_common_hdr *hdif_hdr)
{
struct dt_node *cvc_reserved_mem, *node, *parent;
int count, i;
unsigned int asize;
/* Are the hdat values populated? */
if (!HDIF_get_idata(hdif_hdr, TPMREL_IDATA_HASH_VERIF_OFFSETS, &asize))
return;
if (asize < sizeof(struct HDIF_array_hdr)) {
prlog(PR_ERR, "hash_and_verification idata not populated\n");
return;
}
node = dt_find_by_path(dt_root, "/ibm,secureboot");
if (!node)
return;
cvc_reserved_mem = get_hb_reserved_memory("ibm,secure-crypt-algo-code");
if (!cvc_reserved_mem) {
prlog(PR_ERR, "CVC reserved memory not found\n");
return;
}
parent = dt_new(node, "ibm,cvc");
assert(parent);
dt_add_property_cells(parent, "#address-cells", 1);
dt_add_property_cells(parent, "#size-cells", 0);
dt_add_property_strings(parent, "compatible", "ibm,container-verification-code");
dt_add_property_cells(parent, "memory-region", cvc_reserved_mem->phandle);
/*
* Initialize each service provided by the container verification code
*/
count = HDIF_get_iarray_size(hdif_hdr, TPMREL_IDATA_HASH_VERIF_OFFSETS);
if (count <= 0 ) {
prlog(PR_ERR, "no CVC service found\n");
return;
}
for (i = 0; i < count; i++) {
const struct hash_and_verification *hv;
uint32_t type, offset, version;
const char *compat;
hv = HDIF_get_iarray_item(hdif_hdr,
TPMREL_IDATA_HASH_VERIF_OFFSETS,
i, NULL);
type = be32_to_cpu(hv->type);
offset = be32_to_cpu(hv->offset);
version = be32_to_cpu(hv->version);
compat = cvc_service_map_compat(type);
if (!compat) {
prlog(PR_WARNING, "CVC service type 0x%x unknown\n", type);
continue;
}
node = dt_new_addr(parent, "ibm,cvc-service", offset);
dt_add_property_strings(node, "compatible", compat);
dt_add_property_cells(node, "reg", offset);
dt_add_property_cells(node, "version", version);
}
}
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);
tpmrel_cvc_init(hdif_hdr);
}
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