1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2022 Intel Corporation. */
#include <linux/firmware.h>
#include <asm/cpu.h>
#include <asm/microcode_intel.h>
#include "ifs.h"
static int ifs_sanity_check(struct device *dev,
const struct microcode_header_intel *mc_header)
{
unsigned long total_size, data_size;
u32 sum, *mc;
total_size = get_totalsize(mc_header);
data_size = get_datasize(mc_header);
if ((data_size + MC_HEADER_SIZE > total_size) || (total_size % sizeof(u32))) {
dev_err(dev, "bad ifs data file size.\n");
return -EINVAL;
}
if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
dev_err(dev, "invalid/unknown ifs update format.\n");
return -EINVAL;
}
mc = (u32 *)mc_header;
sum = 0;
for (int i = 0; i < total_size / sizeof(u32); i++)
sum += mc[i];
if (sum) {
dev_err(dev, "bad ifs data checksum, aborting.\n");
return -EINVAL;
}
return 0;
}
static bool find_ifs_matching_signature(struct device *dev, struct ucode_cpu_info *uci,
const struct microcode_header_intel *shdr)
{
unsigned int mc_size;
mc_size = get_totalsize(shdr);
if (!mc_size || ifs_sanity_check(dev, shdr) < 0) {
dev_err(dev, "ifs sanity check failure\n");
return false;
}
if (!intel_cpu_signatures_match(uci->cpu_sig.sig, uci->cpu_sig.pf, shdr->sig, shdr->pf)) {
dev_err(dev, "ifs signature, pf not matching\n");
return false;
}
return true;
}
static bool ifs_image_sanity_check(struct device *dev, const struct microcode_header_intel *data)
{
struct ucode_cpu_info uci;
intel_cpu_collect_info(&uci);
return find_ifs_matching_signature(dev, &uci, data);
}
/*
* Load ifs image. Before loading ifs module, the ifs image must be located
* in /lib/firmware/intel/ifs and named as {family/model/stepping}.{testname}.
*/
void ifs_load_firmware(struct device *dev)
{
const struct firmware *fw;
char scan_path[32];
int ret;
snprintf(scan_path, sizeof(scan_path), "intel/ifs/%02x-%02x-%02x.scan",
boot_cpu_data.x86, boot_cpu_data.x86_model, boot_cpu_data.x86_stepping);
ret = request_firmware_direct(&fw, scan_path, dev);
if (ret) {
dev_err(dev, "ifs file %s load failed\n", scan_path);
return;
}
if (!ifs_image_sanity_check(dev, (struct microcode_header_intel *)fw->data))
dev_err(dev, "ifs header sanity check failed\n");
release_firmware(fw);
}
|
