1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /*
3 * Copyright(c) 2021 Intel Corporation
4 */
5
6 #include "iwl-drv.h"
7 #include "pnvm.h"
8 #include "iwl-prph.h"
9 #include "iwl-io.h"
10
11 #include "fw/uefi.h"
12 #include "fw/api/alive.h"
13 #include <linux/efi.h>
14
15 #define IWL_EFI_VAR_GUID EFI_GUID(0x92daaf2f, 0xc02b, 0x455b, \
16 0xb2, 0xec, 0xf5, 0xa3, \
17 0x59, 0x4f, 0x4a, 0xea)
18
iwl_uefi_get_pnvm(struct iwl_trans * trans,size_t * len)19 void *iwl_uefi_get_pnvm(struct iwl_trans *trans, size_t *len)
20 {
21 struct efivar_entry *pnvm_efivar;
22 void *data;
23 unsigned long package_size;
24 int err;
25
26 *len = 0;
27
28 pnvm_efivar = kzalloc(sizeof(*pnvm_efivar), GFP_KERNEL);
29 if (!pnvm_efivar)
30 return ERR_PTR(-ENOMEM);
31
32 memcpy(&pnvm_efivar->var.VariableName, IWL_UEFI_OEM_PNVM_NAME,
33 sizeof(IWL_UEFI_OEM_PNVM_NAME));
34 pnvm_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;
35
36 /*
37 * TODO: we hardcode a maximum length here, because reading
38 * from the UEFI is not working. To implement this properly,
39 * we have to call efivar_entry_size().
40 */
41 package_size = IWL_HARDCODED_PNVM_SIZE;
42
43 data = kmalloc(package_size, GFP_KERNEL);
44 if (!data) {
45 data = ERR_PTR(-ENOMEM);
46 goto out;
47 }
48
49 err = efivar_entry_get(pnvm_efivar, NULL, &package_size, data);
50 if (err) {
51 IWL_DEBUG_FW(trans,
52 "PNVM UEFI variable not found %d (len %lu)\n",
53 err, package_size);
54 kfree(data);
55 data = ERR_PTR(err);
56 goto out;
57 }
58
59 IWL_DEBUG_FW(trans, "Read PNVM from UEFI with size %lu\n", package_size);
60 *len = package_size;
61
62 out:
63 kfree(pnvm_efivar);
64
65 return data;
66 }
67
iwl_uefi_reduce_power_section(struct iwl_trans * trans,const u8 * data,size_t len)68 static void *iwl_uefi_reduce_power_section(struct iwl_trans *trans,
69 const u8 *data, size_t len)
70 {
71 struct iwl_ucode_tlv *tlv;
72 u8 *reduce_power_data = NULL, *tmp;
73 u32 size = 0;
74
75 IWL_DEBUG_FW(trans, "Handling REDUCE_POWER section\n");
76
77 while (len >= sizeof(*tlv)) {
78 u32 tlv_len, tlv_type;
79
80 len -= sizeof(*tlv);
81 tlv = (void *)data;
82
83 tlv_len = le32_to_cpu(tlv->length);
84 tlv_type = le32_to_cpu(tlv->type);
85
86 if (len < tlv_len) {
87 IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
88 len, tlv_len);
89 kfree(reduce_power_data);
90 reduce_power_data = ERR_PTR(-EINVAL);
91 goto out;
92 }
93
94 data += sizeof(*tlv);
95
96 switch (tlv_type) {
97 case IWL_UCODE_TLV_MEM_DESC: {
98 IWL_DEBUG_FW(trans,
99 "Got IWL_UCODE_TLV_MEM_DESC len %d\n",
100 tlv_len);
101
102 IWL_DEBUG_FW(trans, "Adding data (size %d)\n", tlv_len);
103
104 tmp = krealloc(reduce_power_data, size + tlv_len, GFP_KERNEL);
105 if (!tmp) {
106 IWL_DEBUG_FW(trans,
107 "Couldn't allocate (more) reduce_power_data\n");
108
109 kfree(reduce_power_data);
110 reduce_power_data = ERR_PTR(-ENOMEM);
111 goto out;
112 }
113
114 reduce_power_data = tmp;
115
116 memcpy(reduce_power_data + size, data, tlv_len);
117
118 size += tlv_len;
119
120 break;
121 }
122 case IWL_UCODE_TLV_PNVM_SKU:
123 IWL_DEBUG_FW(trans,
124 "New REDUCE_POWER section started, stop parsing.\n");
125 goto done;
126 default:
127 IWL_DEBUG_FW(trans, "Found TLV 0x%0x, len %d\n",
128 tlv_type, tlv_len);
129 break;
130 }
131
132 len -= ALIGN(tlv_len, 4);
133 data += ALIGN(tlv_len, 4);
134 }
135
136 done:
137 if (!size) {
138 IWL_DEBUG_FW(trans, "Empty REDUCE_POWER, skipping.\n");
139 /* Better safe than sorry, but 'reduce_power_data' should
140 * always be NULL if !size.
141 */
142 kfree(reduce_power_data);
143 reduce_power_data = ERR_PTR(-ENOENT);
144 goto out;
145 }
146
147 IWL_INFO(trans, "loaded REDUCE_POWER\n");
148
149 out:
150 return reduce_power_data;
151 }
152
iwl_uefi_reduce_power_parse(struct iwl_trans * trans,const u8 * data,size_t len)153 static void *iwl_uefi_reduce_power_parse(struct iwl_trans *trans,
154 const u8 *data, size_t len)
155 {
156 struct iwl_ucode_tlv *tlv;
157 void *sec_data;
158
159 IWL_DEBUG_FW(trans, "Parsing REDUCE_POWER data\n");
160
161 while (len >= sizeof(*tlv)) {
162 u32 tlv_len, tlv_type;
163
164 len -= sizeof(*tlv);
165 tlv = (void *)data;
166
167 tlv_len = le32_to_cpu(tlv->length);
168 tlv_type = le32_to_cpu(tlv->type);
169
170 if (len < tlv_len) {
171 IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
172 len, tlv_len);
173 return ERR_PTR(-EINVAL);
174 }
175
176 if (tlv_type == IWL_UCODE_TLV_PNVM_SKU) {
177 struct iwl_sku_id *sku_id =
178 (void *)(data + sizeof(*tlv));
179
180 IWL_DEBUG_FW(trans,
181 "Got IWL_UCODE_TLV_PNVM_SKU len %d\n",
182 tlv_len);
183 IWL_DEBUG_FW(trans, "sku_id 0x%0x 0x%0x 0x%0x\n",
184 le32_to_cpu(sku_id->data[0]),
185 le32_to_cpu(sku_id->data[1]),
186 le32_to_cpu(sku_id->data[2]));
187
188 data += sizeof(*tlv) + ALIGN(tlv_len, 4);
189 len -= ALIGN(tlv_len, 4);
190
191 if (trans->sku_id[0] == le32_to_cpu(sku_id->data[0]) &&
192 trans->sku_id[1] == le32_to_cpu(sku_id->data[1]) &&
193 trans->sku_id[2] == le32_to_cpu(sku_id->data[2])) {
194 sec_data = iwl_uefi_reduce_power_section(trans,
195 data,
196 len);
197 if (!IS_ERR(sec_data))
198 return sec_data;
199 } else {
200 IWL_DEBUG_FW(trans, "SKU ID didn't match!\n");
201 }
202 } else {
203 data += sizeof(*tlv) + ALIGN(tlv_len, 4);
204 len -= ALIGN(tlv_len, 4);
205 }
206 }
207
208 return ERR_PTR(-ENOENT);
209 }
210
iwl_uefi_get_reduced_power(struct iwl_trans * trans,size_t * len)211 void *iwl_uefi_get_reduced_power(struct iwl_trans *trans, size_t *len)
212 {
213 struct efivar_entry *reduce_power_efivar;
214 struct pnvm_sku_package *package;
215 void *data = NULL;
216 unsigned long package_size;
217 int err;
218
219 *len = 0;
220
221 reduce_power_efivar = kzalloc(sizeof(*reduce_power_efivar), GFP_KERNEL);
222 if (!reduce_power_efivar)
223 return ERR_PTR(-ENOMEM);
224
225 memcpy(&reduce_power_efivar->var.VariableName, IWL_UEFI_REDUCED_POWER_NAME,
226 sizeof(IWL_UEFI_REDUCED_POWER_NAME));
227 reduce_power_efivar->var.VendorGuid = IWL_EFI_VAR_GUID;
228
229 /*
230 * TODO: we hardcode a maximum length here, because reading
231 * from the UEFI is not working. To implement this properly,
232 * we have to call efivar_entry_size().
233 */
234 package_size = IWL_HARDCODED_REDUCE_POWER_SIZE;
235
236 package = kmalloc(package_size, GFP_KERNEL);
237 if (!package) {
238 package = ERR_PTR(-ENOMEM);
239 goto out;
240 }
241
242 err = efivar_entry_get(reduce_power_efivar, NULL, &package_size, package);
243 if (err) {
244 IWL_DEBUG_FW(trans,
245 "Reduced Power UEFI variable not found %d (len %lu)\n",
246 err, package_size);
247 kfree(package);
248 data = ERR_PTR(err);
249 goto out;
250 }
251
252 IWL_DEBUG_FW(trans, "Read reduced power from UEFI with size %lu\n",
253 package_size);
254 *len = package_size;
255
256 IWL_DEBUG_FW(trans, "rev %d, total_size %d, n_skus %d\n",
257 package->rev, package->total_size, package->n_skus);
258
259 data = iwl_uefi_reduce_power_parse(trans, package->data,
260 *len - sizeof(*package));
261
262 kfree(package);
263
264 out:
265 kfree(reduce_power_efivar);
266
267 return data;
268 }
269