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
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2022, Linaro Limited
*/
#define LOG_CATEGORY UCLASS_FWU_MDATA
#include <blk.h>
#include <dm.h>
#include <efi_loader.h>
#include <fwu.h>
#include <fwu_mdata.h>
#include <log.h>
#include <memalign.h>
#include <part.h>
#include <part_efi.h>
#include <dm/device-internal.h>
#include <linux/errno.h>
#include <linux/types.h>
enum {
MDATA_READ = 1,
MDATA_WRITE,
};
static uint g_mdata_part[2]; /* = {0, 0} to check against uninit parts */
static int gpt_get_mdata_partitions(struct blk_desc *desc)
{
int i;
u32 nparts;
efi_guid_t part_type_guid;
struct disk_partition info;
const efi_guid_t fwu_mdata_guid = FWU_MDATA_GUID;
/* if primary and secondary partitions already found */
if (g_mdata_part[0] && g_mdata_part[1])
return 0;
nparts = 0;
for (i = 1; i < MAX_SEARCH_PARTITIONS && nparts < 2; i++) {
if (part_get_info(desc, i, &info))
continue;
uuid_str_to_bin(info.type_guid, part_type_guid.b,
UUID_STR_FORMAT_GUID);
if (!guidcmp(&fwu_mdata_guid, &part_type_guid))
g_mdata_part[nparts++] = i;
}
if (nparts != 2) {
log_debug("Expect two copies of the FWU metadata instead of %d\n",
nparts);
g_mdata_part[0] = 0;
g_mdata_part[1] = 0;
return -EINVAL;
}
return 0;
}
static int gpt_get_mdata_disk_part(struct blk_desc *desc,
struct disk_partition *info,
u32 part_num)
{
int ret;
char *mdata_guid_str = "8a7a84a0-8387-40f6-ab41-a8b9a5a60d23";
ret = part_get_info(desc, part_num, info);
if (ret < 0) {
log_debug("Unable to get the partition info for the FWU metadata part %d\n",
part_num);
return -ENOENT;
}
/* Check that it is indeed the FWU metadata partition */
if (!strncmp(info->type_guid, mdata_guid_str, UUID_STR_LEN))
return 0;
return -ENOENT;
}
static int gpt_read_write_mdata(struct blk_desc *desc,
struct fwu_mdata *mdata,
u8 access, u32 part_num)
{
int ret;
u32 len, blk_start, blkcnt;
struct disk_partition info;
ALLOC_CACHE_ALIGN_BUFFER_PAD(struct fwu_mdata, mdata_aligned, 1,
desc->blksz);
if (!mdata)
return -ENOMEM;
ret = gpt_get_mdata_disk_part(desc, &info, part_num);
if (ret < 0) {
printf("Unable to get the FWU metadata partition\n");
return -ENOENT;
}
len = sizeof(*mdata);
blkcnt = BLOCK_CNT(len, desc);
if (blkcnt > info.size) {
log_debug("Block count exceeds FWU metadata partition size\n");
return -ERANGE;
}
blk_start = info.start;
if (access == MDATA_READ) {
if (blk_dread(desc, blk_start, blkcnt, mdata_aligned) != blkcnt) {
log_debug("Error reading FWU metadata from the device\n");
return -EIO;
}
memcpy(mdata, mdata_aligned, sizeof(struct fwu_mdata));
} else {
if (blk_dwrite(desc, blk_start, blkcnt, mdata) != blkcnt) {
log_debug("Error writing FWU metadata to the device\n");
return -EIO;
}
}
return 0;
}
static int fwu_get_mdata_device(struct udevice *dev, struct udevice **mdata_dev)
{
u32 phandle;
int ret, size;
struct udevice *parent;
const fdt32_t *phandle_p = NULL;
phandle_p = dev_read_prop(dev, "fwu-mdata-store", &size);
if (!phandle_p) {
log_debug("fwu-mdata-store property not found\n");
return -ENOENT;
}
phandle = fdt32_to_cpu(*phandle_p);
ret = device_get_global_by_ofnode(ofnode_get_by_phandle(phandle),
&parent);
if (ret)
return ret;
return blk_get_from_parent(parent, mdata_dev);
}
static int fwu_mdata_gpt_blk_probe(struct udevice *dev)
{
int ret;
struct udevice *mdata_dev = NULL;
struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
ret = fwu_get_mdata_device(dev, &mdata_dev);
if (ret)
return ret;
priv->blk_dev = mdata_dev;
return 0;
}
static int fwu_gpt_read_mdata(struct udevice *dev, struct fwu_mdata *mdata,
bool primary)
{
struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
struct blk_desc *desc = dev_get_uclass_plat(priv->blk_dev);
int ret;
ret = gpt_get_mdata_partitions(desc);
if (ret < 0) {
log_debug("Error getting the FWU metadata partitions\n");
return -ENOENT;
}
return gpt_read_write_mdata(desc, mdata, MDATA_READ,
primary ? g_mdata_part[0] : g_mdata_part[1]);
}
static int fwu_gpt_write_mdata(struct udevice *dev, struct fwu_mdata *mdata,
bool primary)
{
struct fwu_mdata_gpt_blk_priv *priv = dev_get_priv(dev);
struct blk_desc *desc = dev_get_uclass_plat(priv->blk_dev);
int ret;
ret = gpt_get_mdata_partitions(desc);
if (ret < 0) {
log_debug("Error getting the FWU metadata partitions\n");
return -ENOENT;
}
return gpt_read_write_mdata(desc, mdata, MDATA_WRITE,
primary ? g_mdata_part[0] : g_mdata_part[1]);
}
static const struct fwu_mdata_ops fwu_gpt_blk_ops = {
.read_mdata = fwu_gpt_read_mdata,
.write_mdata = fwu_gpt_write_mdata,
};
static const struct udevice_id fwu_mdata_ids[] = {
{ .compatible = "u-boot,fwu-mdata-gpt" },
{ }
};
U_BOOT_DRIVER(fwu_mdata_gpt_blk) = {
.name = "fwu-mdata-gpt-blk",
.id = UCLASS_FWU_MDATA,
.of_match = fwu_mdata_ids,
.ops = &fwu_gpt_blk_ops,
.probe = fwu_mdata_gpt_blk_probe,
.priv_auto = sizeof(struct fwu_mdata_gpt_blk_priv),
};
|