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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#include "fw/runtime.h"
15
16#define IWL_EFI_VAR_GUID EFI_GUID(0x92daaf2f, 0xc02b, 0x455b, \
17 0xb2, 0xec, 0xf5, 0xa3, \
18 0x59, 0x4f, 0x4a, 0xea)
19
20void *iwl_uefi_get_pnvm(struct iwl_trans *trans, size_t *len)
21{
22 void *data;
23 unsigned long package_size;
24 efi_status_t status;
25
26 *len = 0;
27
28 if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
29 return ERR_PTR(-ENODEV);
30
31 /*
32 * TODO: we hardcode a maximum length here, because reading
33 * from the UEFI is not working. To implement this properly,
34 * we have to call efivar_entry_size().
35 */
36 package_size = IWL_HARDCODED_PNVM_SIZE;
37
38 data = kmalloc(package_size, GFP_KERNEL);
39 if (!data)
40 return ERR_PTR(-ENOMEM);
41
42 status = efi.get_variable(IWL_UEFI_OEM_PNVM_NAME, &IWL_EFI_VAR_GUID,
43 NULL, &package_size, data);
44 if (status != EFI_SUCCESS) {
45 IWL_DEBUG_FW(trans,
46 "PNVM UEFI variable not found 0x%lx (len %lu)\n",
47 status, package_size);
48 kfree(data);
49 return ERR_PTR(-ENOENT);
50 }
51
52 IWL_DEBUG_FW(trans, "Read PNVM from UEFI with size %lu\n", package_size);
53 *len = package_size;
54
55 return data;
56}
57
58static void *iwl_uefi_reduce_power_section(struct iwl_trans *trans,
59 const u8 *data, size_t len)
60{
61 const struct iwl_ucode_tlv *tlv;
62 u8 *reduce_power_data = NULL, *tmp;
63 u32 size = 0;
64
65 IWL_DEBUG_FW(trans, "Handling REDUCE_POWER section\n");
66
67 while (len >= sizeof(*tlv)) {
68 u32 tlv_len, tlv_type;
69
70 len -= sizeof(*tlv);
71 tlv = (const void *)data;
72
73 tlv_len = le32_to_cpu(tlv->length);
74 tlv_type = le32_to_cpu(tlv->type);
75
76 if (len < tlv_len) {
77 IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
78 len, tlv_len);
79 kfree(reduce_power_data);
80 reduce_power_data = ERR_PTR(-EINVAL);
81 goto out;
82 }
83
84 data += sizeof(*tlv);
85
86 switch (tlv_type) {
87 case IWL_UCODE_TLV_MEM_DESC: {
88 IWL_DEBUG_FW(trans,
89 "Got IWL_UCODE_TLV_MEM_DESC len %d\n",
90 tlv_len);
91
92 IWL_DEBUG_FW(trans, "Adding data (size %d)\n", tlv_len);
93
94 tmp = krealloc(reduce_power_data, size + tlv_len, GFP_KERNEL);
95 if (!tmp) {
96 IWL_DEBUG_FW(trans,
97 "Couldn't allocate (more) reduce_power_data\n");
98
99 kfree(reduce_power_data);
100 reduce_power_data = ERR_PTR(-ENOMEM);
101 goto out;
102 }
103
104 reduce_power_data = tmp;
105
106 memcpy(reduce_power_data + size, data, tlv_len);
107
108 size += tlv_len;
109
110 break;
111 }
112 case IWL_UCODE_TLV_PNVM_SKU:
113 IWL_DEBUG_FW(trans,
114 "New REDUCE_POWER section started, stop parsing.\n");
115 goto done;
116 default:
117 IWL_DEBUG_FW(trans, "Found TLV 0x%0x, len %d\n",
118 tlv_type, tlv_len);
119 break;
120 }
121
122 len -= ALIGN(tlv_len, 4);
123 data += ALIGN(tlv_len, 4);
124 }
125
126done:
127 if (!size) {
128 IWL_DEBUG_FW(trans, "Empty REDUCE_POWER, skipping.\n");
129 /* Better safe than sorry, but 'reduce_power_data' should
130 * always be NULL if !size.
131 */
132 kfree(reduce_power_data);
133 reduce_power_data = ERR_PTR(-ENOENT);
134 goto out;
135 }
136
137 IWL_INFO(trans, "loaded REDUCE_POWER\n");
138
139out:
140 return reduce_power_data;
141}
142
143static void *iwl_uefi_reduce_power_parse(struct iwl_trans *trans,
144 const u8 *data, size_t len)
145{
146 const struct iwl_ucode_tlv *tlv;
147 void *sec_data;
148
149 IWL_DEBUG_FW(trans, "Parsing REDUCE_POWER data\n");
150
151 while (len >= sizeof(*tlv)) {
152 u32 tlv_len, tlv_type;
153
154 len -= sizeof(*tlv);
155 tlv = (const void *)data;
156
157 tlv_len = le32_to_cpu(tlv->length);
158 tlv_type = le32_to_cpu(tlv->type);
159
160 if (len < tlv_len) {
161 IWL_ERR(trans, "invalid TLV len: %zd/%u\n",
162 len, tlv_len);
163 return ERR_PTR(-EINVAL);
164 }
165
166 if (tlv_type == IWL_UCODE_TLV_PNVM_SKU) {
167 const struct iwl_sku_id *sku_id =
168 (const void *)(data + sizeof(*tlv));
169
170 IWL_DEBUG_FW(trans,
171 "Got IWL_UCODE_TLV_PNVM_SKU len %d\n",
172 tlv_len);
173 IWL_DEBUG_FW(trans, "sku_id 0x%0x 0x%0x 0x%0x\n",
174 le32_to_cpu(sku_id->data[0]),
175 le32_to_cpu(sku_id->data[1]),
176 le32_to_cpu(sku_id->data[2]));
177
178 data += sizeof(*tlv) + ALIGN(tlv_len, 4);
179 len -= ALIGN(tlv_len, 4);
180
181 if (trans->sku_id[0] == le32_to_cpu(sku_id->data[0]) &&
182 trans->sku_id[1] == le32_to_cpu(sku_id->data[1]) &&
183 trans->sku_id[2] == le32_to_cpu(sku_id->data[2])) {
184 sec_data = iwl_uefi_reduce_power_section(trans,
185 data,
186 len);
187 if (!IS_ERR(sec_data))
188 return sec_data;
189 } else {
190 IWL_DEBUG_FW(trans, "SKU ID didn't match!\n");
191 }
192 } else {
193 data += sizeof(*tlv) + ALIGN(tlv_len, 4);
194 len -= ALIGN(tlv_len, 4);
195 }
196 }
197
198 return ERR_PTR(-ENOENT);
199}
200
201void *iwl_uefi_get_reduced_power(struct iwl_trans *trans, size_t *len)
202{
203 struct pnvm_sku_package *package;
204 void *data = NULL;
205 unsigned long package_size;
206 efi_status_t status;
207
208 *len = 0;
209
210 if (!efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
211 return ERR_PTR(-ENODEV);
212
213 /*
214 * TODO: we hardcode a maximum length here, because reading
215 * from the UEFI is not working. To implement this properly,
216 * we have to call efivar_entry_size().
217 */
218 package_size = IWL_HARDCODED_REDUCE_POWER_SIZE;
219
220 package = kmalloc(package_size, GFP_KERNEL);
221 if (!package)
222 return ERR_PTR(-ENOMEM);
223
224 status = efi.get_variable(IWL_UEFI_REDUCED_POWER_NAME, &IWL_EFI_VAR_GUID,
225 NULL, &package_size, data);
226 if (status != EFI_SUCCESS) {
227 IWL_DEBUG_FW(trans,
228 "Reduced Power UEFI variable not found 0x%lx (len %lu)\n",
229 status, package_size);
230 kfree(package);
231 return ERR_PTR(-ENOENT);
232 }
233
234 IWL_DEBUG_FW(trans, "Read reduced power from UEFI with size %lu\n",
235 package_size);
236 *len = package_size;
237
238 IWL_DEBUG_FW(trans, "rev %d, total_size %d, n_skus %d\n",
239 package->rev, package->total_size, package->n_skus);
240
241 data = iwl_uefi_reduce_power_parse(trans, package->data,
242 *len - sizeof(*package));
243
244 kfree(package);
245
246 return data;
247}
248
249#ifdef CONFIG_ACPI
250static int iwl_uefi_sgom_parse(struct uefi_cnv_wlan_sgom_data *sgom_data,
251 struct iwl_fw_runtime *fwrt)
252{
253 int i, j;
254
255 if (sgom_data->revision != 1)
256 return -EINVAL;
257
258 memcpy(fwrt->sgom_table.offset_map, sgom_data->offset_map,
259 sizeof(fwrt->sgom_table.offset_map));
260
261 for (i = 0; i < MCC_TO_SAR_OFFSET_TABLE_ROW_SIZE; i++) {
262 for (j = 0; j < MCC_TO_SAR_OFFSET_TABLE_COL_SIZE; j++) {
263 /* since each byte is composed of to values, */
264 /* one for each letter, */
265 /* extract and check each of them separately */
266 u8 value = fwrt->sgom_table.offset_map[i][j];
267 u8 low = value & 0xF;
268 u8 high = (value & 0xF0) >> 4;
269
270 if (high > fwrt->geo_num_profiles)
271 high = 0;
272 if (low > fwrt->geo_num_profiles)
273 low = 0;
274 fwrt->sgom_table.offset_map[i][j] = (high << 4) | low;
275 }
276 }
277
278 fwrt->sgom_enabled = true;
279 return 0;
280}
281
282void iwl_uefi_get_sgom_table(struct iwl_trans *trans,
283 struct iwl_fw_runtime *fwrt)
284{
285 struct uefi_cnv_wlan_sgom_data *data;
286 unsigned long package_size;
287 efi_status_t status;
288 int ret;
289
290 if (!fwrt->geo_enabled ||
291 !efi_rt_services_supported(EFI_RT_SUPPORTED_GET_VARIABLE))
292 return;
293
294 /* TODO: we hardcode a maximum length here, because reading
295 * from the UEFI is not working. To implement this properly,
296 * we have to call efivar_entry_size().
297 */
298 package_size = IWL_HARDCODED_SGOM_SIZE;
299
300 data = kmalloc(package_size, GFP_KERNEL);
301 if (!data)
302 return;
303
304 status = efi.get_variable(IWL_UEFI_SGOM_NAME, &IWL_EFI_VAR_GUID,
305 NULL, &package_size, data);
306 if (status != EFI_SUCCESS) {
307 IWL_DEBUG_FW(trans,
308 "SGOM UEFI variable not found 0x%lx\n", status);
309 goto out_free;
310 }
311
312 IWL_DEBUG_FW(trans, "Read SGOM from UEFI with size %lu\n",
313 package_size);
314
315 ret = iwl_uefi_sgom_parse(data, fwrt);
316 if (ret < 0)
317 IWL_DEBUG_FW(trans, "Cannot read SGOM tables. rev is invalid\n");
318
319out_free:
320 kfree(data);
321
322}
323IWL_EXPORT_SYMBOL(iwl_uefi_get_sgom_table);
324#endif /* CONFIG_ACPI */