1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2017 Google, Inc.
4*4882a593Smuzhiyun * Thiebaud Weksteen <tweek@google.com>
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #define TPM_MEMREMAP(start, size) early_memremap(start, size)
8*4882a593Smuzhiyun #define TPM_MEMUNMAP(start, size) early_memunmap(start, size)
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <asm/early_ioremap.h>
11*4882a593Smuzhiyun #include <linux/efi.h>
12*4882a593Smuzhiyun #include <linux/init.h>
13*4882a593Smuzhiyun #include <linux/memblock.h>
14*4882a593Smuzhiyun #include <linux/tpm_eventlog.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun int efi_tpm_final_log_size;
17*4882a593Smuzhiyun EXPORT_SYMBOL(efi_tpm_final_log_size);
18*4882a593Smuzhiyun
tpm2_calc_event_log_size(void * data,int count,void * size_info)19*4882a593Smuzhiyun static int __init tpm2_calc_event_log_size(void *data, int count, void *size_info)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct tcg_pcr_event2_head *header;
22*4882a593Smuzhiyun int event_size, size = 0;
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun while (count > 0) {
25*4882a593Smuzhiyun header = data + size;
26*4882a593Smuzhiyun event_size = __calc_tpm2_event_size(header, size_info, true);
27*4882a593Smuzhiyun if (event_size == 0)
28*4882a593Smuzhiyun return -1;
29*4882a593Smuzhiyun size += event_size;
30*4882a593Smuzhiyun count--;
31*4882a593Smuzhiyun }
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun return size;
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun /*
37*4882a593Smuzhiyun * Reserve the memory associated with the TPM Event Log configuration table.
38*4882a593Smuzhiyun */
efi_tpm_eventlog_init(void)39*4882a593Smuzhiyun int __init efi_tpm_eventlog_init(void)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun struct linux_efi_tpm_eventlog *log_tbl;
42*4882a593Smuzhiyun struct efi_tcg2_final_events_table *final_tbl;
43*4882a593Smuzhiyun int tbl_size;
44*4882a593Smuzhiyun int ret = 0;
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) {
47*4882a593Smuzhiyun /*
48*4882a593Smuzhiyun * We can't calculate the size of the final events without the
49*4882a593Smuzhiyun * first entry in the TPM log, so bail here.
50*4882a593Smuzhiyun */
51*4882a593Smuzhiyun return 0;
52*4882a593Smuzhiyun }
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun log_tbl = early_memremap(efi.tpm_log, sizeof(*log_tbl));
55*4882a593Smuzhiyun if (!log_tbl) {
56*4882a593Smuzhiyun pr_err("Failed to map TPM Event Log table @ 0x%lx\n",
57*4882a593Smuzhiyun efi.tpm_log);
58*4882a593Smuzhiyun efi.tpm_log = EFI_INVALID_TABLE_ADDR;
59*4882a593Smuzhiyun return -ENOMEM;
60*4882a593Smuzhiyun }
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun tbl_size = sizeof(*log_tbl) + log_tbl->size;
63*4882a593Smuzhiyun memblock_reserve(efi.tpm_log, tbl_size);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR) {
66*4882a593Smuzhiyun pr_info("TPM Final Events table not present\n");
67*4882a593Smuzhiyun goto out;
68*4882a593Smuzhiyun } else if (log_tbl->version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) {
69*4882a593Smuzhiyun pr_warn(FW_BUG "TPM Final Events table invalid\n");
70*4882a593Smuzhiyun goto out;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun final_tbl = early_memremap(efi.tpm_final_log, sizeof(*final_tbl));
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun if (!final_tbl) {
76*4882a593Smuzhiyun pr_err("Failed to map TPM Final Event Log table @ 0x%lx\n",
77*4882a593Smuzhiyun efi.tpm_final_log);
78*4882a593Smuzhiyun efi.tpm_final_log = EFI_INVALID_TABLE_ADDR;
79*4882a593Smuzhiyun ret = -ENOMEM;
80*4882a593Smuzhiyun goto out;
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun tbl_size = 0;
84*4882a593Smuzhiyun if (final_tbl->nr_events != 0) {
85*4882a593Smuzhiyun void *events = (void *)efi.tpm_final_log
86*4882a593Smuzhiyun + sizeof(final_tbl->version)
87*4882a593Smuzhiyun + sizeof(final_tbl->nr_events);
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun tbl_size = tpm2_calc_event_log_size(events,
90*4882a593Smuzhiyun final_tbl->nr_events,
91*4882a593Smuzhiyun log_tbl->log);
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun if (tbl_size < 0) {
95*4882a593Smuzhiyun pr_err(FW_BUG "Failed to parse event in TPM Final Events Log\n");
96*4882a593Smuzhiyun ret = -EINVAL;
97*4882a593Smuzhiyun goto out_calc;
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun
100*4882a593Smuzhiyun memblock_reserve(efi.tpm_final_log,
101*4882a593Smuzhiyun tbl_size + sizeof(*final_tbl));
102*4882a593Smuzhiyun efi_tpm_final_log_size = tbl_size;
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun out_calc:
105*4882a593Smuzhiyun early_memunmap(final_tbl, sizeof(*final_tbl));
106*4882a593Smuzhiyun out:
107*4882a593Smuzhiyun early_memunmap(log_tbl, sizeof(*log_tbl));
108*4882a593Smuzhiyun return ret;
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
111