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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
|
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
* Copyright(c) 2021 Intel Corporation
*/
#include "iwl-drv.h"
#include "pnvm.h"
#include "iwl-prph.h"
#include "iwl-io.h"
#include "fw/uefi.h"
#include "fw/api/alive.h"
#include <linux/efi.h>
#define IWL_EFI_VAR_GUID EFI_GUID(0x92daaf2f, 0xc02b, 0x455b, \
0xb2, 0xec, 0xf5, 0xa3, \
0x59, 0x4f, 0x4a, 0xea)
void *iwl_uefi_get_pnvm(struct iwl_trans *trans, size_t *len)
{
struct efivar_entry *pnvm_efivar;
void *data;
unsigned long package_size;
int err;
*len = 0;
pnvm_efivar = kzalloc(sizeof(*pnvm_efivar), GFP_KERNEL);
if (!pnvm_efivar)
return ERR_PTR(-ENOMEM);
memcpy(&pnvm_efivar->var.VariableName, IWL_UEFI_OEM_PNVM_NAME,
sizeof(IWL_UEFI_OEM_PNVM_NAME));
pnvm_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;
/*
* TODO: we hardcode a maximum length here, because reading
* from the UEFI is not working. To implement this properly,
* we have to call efivar_entry_size().
*/
package_size = IWL_HARDCODED_PNVM_SIZE;
data = kmalloc(package_size, GFP_KERNEL);
if (!data) {
data = ERR_PTR(-ENOMEM);
goto out;
}
err = efivar_entry_get(pnvm_efivar, NULL, &package_size, data);
if (err) {
IWL_DEBUG_FW(trans,
"PNVM UEFI variable not found %d (len %lu)\n",
err, package_size);
kfree(data);
data = ERR_PTR(err);
goto out;
}
IWL_DEBUG_FW(trans, "Read PNVM from UEFI with size %lu\n", package_size);
*len = package_size;
out:
kfree(pnvm_efivar);
return data;
}
static void *iwl_uefi_reduce_power_section(struct iwl_trans *trans,
const u8 *data, size_t len)
{
struct iwl_ucode_tlv *tlv;
u8 *reduce_power_data = NULL, *tmp;
u32 size = 0;
IWL_DEBUG_FW(trans, "Handling REDUCE_POWER section\n");
while (len >= sizeof(*tlv)) {
u32 tlv_len, tlv_type;
len -= sizeof(*tlv);
tlv = (void *)data;
tlv_len = le32_to_cpu(tlv->length);
tlv_type = le32_to_cpu(tlv->type);
if (len < tlv_len) {
IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
len, tlv_len);
reduce_power_data = ERR_PTR(-EINVAL);
goto out;
}
data += sizeof(*tlv);
switch (tlv_type) {
case IWL_UCODE_TLV_MEM_DESC: {
IWL_DEBUG_FW(trans,
"Got IWL_UCODE_TLV_MEM_DESC len %d\n",
tlv_len);
IWL_DEBUG_FW(trans, "Adding data (size %d)\n", tlv_len);
tmp = krealloc(reduce_power_data, size + tlv_len, GFP_KERNEL);
if (!tmp) {
IWL_DEBUG_FW(trans,
"Couldn't allocate (more) reduce_power_data\n");
reduce_power_data = ERR_PTR(-ENOMEM);
goto out;
}
reduce_power_data = tmp;
memcpy(reduce_power_data + size, data, tlv_len);
size += tlv_len;
break;
}
case IWL_UCODE_TLV_PNVM_SKU:
IWL_DEBUG_FW(trans,
"New REDUCE_POWER section started, stop parsing.\n");
goto done;
default:
IWL_DEBUG_FW(trans, "Found TLV 0x%0x, len %d\n",
tlv_type, tlv_len);
break;
}
len -= ALIGN(tlv_len, 4);
data += ALIGN(tlv_len, 4);
}
done:
if (!size) {
IWL_DEBUG_FW(trans, "Empty REDUCE_POWER, skipping.\n");
reduce_power_data = ERR_PTR(-ENOENT);
goto out;
}
IWL_INFO(trans, "loaded REDUCE_POWER\n");
out:
return reduce_power_data;
}
static void *iwl_uefi_reduce_power_parse(struct iwl_trans *trans,
const u8 *data, size_t len)
{
struct iwl_ucode_tlv *tlv;
void *sec_data;
IWL_DEBUG_FW(trans, "Parsing REDUCE_POWER data\n");
while (len >= sizeof(*tlv)) {
u32 tlv_len, tlv_type;
len -= sizeof(*tlv);
tlv = (void *)data;
tlv_len = le32_to_cpu(tlv->length);
tlv_type = le32_to_cpu(tlv->type);
if (len < tlv_len) {
IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
len, tlv_len);
return ERR_PTR(-EINVAL);
}
if (tlv_type == IWL_UCODE_TLV_PNVM_SKU) {
struct iwl_sku_id *sku_id =
(void *)(data + sizeof(*tlv));
IWL_DEBUG_FW(trans,
"Got IWL_UCODE_TLV_PNVM_SKU len %d\n",
tlv_len);
IWL_DEBUG_FW(trans, "sku_id 0x%0x 0x%0x 0x%0x\n",
le32_to_cpu(sku_id->data[0]),
le32_to_cpu(sku_id->data[1]),
le32_to_cpu(sku_id->data[2]));
data += sizeof(*tlv) + ALIGN(tlv_len, 4);
len -= ALIGN(tlv_len, 4);
if (trans->sku_id[0] == le32_to_cpu(sku_id->data[0]) &&
trans->sku_id[1] == le32_to_cpu(sku_id->data[1]) &&
trans->sku_id[2] == le32_to_cpu(sku_id->data[2])) {
sec_data = iwl_uefi_reduce_power_section(trans,
data,
len);
if (!IS_ERR(sec_data))
return sec_data;
} else {
IWL_DEBUG_FW(trans, "SKU ID didn't match!\n");
}
} else {
data += sizeof(*tlv) + ALIGN(tlv_len, 4);
len -= ALIGN(tlv_len, 4);
}
}
return ERR_PTR(-ENOENT);
}
void *iwl_uefi_get_reduced_power(struct iwl_trans *trans, size_t *len)
{
struct efivar_entry *reduce_power_efivar;
struct pnvm_sku_package *package;
void *data = NULL;
unsigned long package_size;
int err;
*len = 0;
reduce_power_efivar = kzalloc(sizeof(*reduce_power_efivar), GFP_KERNEL);
if (!reduce_power_efivar)
return ERR_PTR(-ENOMEM);
memcpy(&reduce_power_efivar->var.VariableName, IWL_UEFI_REDUCED_POWER_NAME,
sizeof(IWL_UEFI_REDUCED_POWER_NAME));
reduce_power_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;
/*
* TODO: we hardcode a maximum length here, because reading
* from the UEFI is not working. To implement this properly,
* we have to call efivar_entry_size().
*/
package_size = IWL_HARDCODED_REDUCE_POWER_SIZE;
package = kmalloc(package_size, GFP_KERNEL);
if (!package) {
package = ERR_PTR(-ENOMEM);
goto out;
}
err = efivar_entry_get(reduce_power_efivar, NULL, &package_size, package);
if (err) {
IWL_DEBUG_FW(trans,
"Reduced Power UEFI variable not found %d (len %lu)\n",
err, package_size);
kfree(package);
data = ERR_PTR(err);
goto out;
}
IWL_DEBUG_FW(trans, "Read reduced power from UEFI with size %lu\n",
package_size);
*len = package_size;
IWL_DEBUG_FW(trans, "rev %d, total_size %d, n_skus %d\n",
package->rev, package->total_size, package->n_skus);
data = iwl_uefi_reduce_power_parse(trans, package->data,
*len - sizeof(*package));
kfree(package);
out:
kfree(reduce_power_efivar);
return data;
}
|
