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 
20 void *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 
58 static 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 
126 done:
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 
139 out:
140 	return reduce_power_data;
141 }
142 
143 static 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 
201 void *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
250 static 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 
282 void 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 
319 out_free:
320 	kfree(data);
321 
322 }
323 IWL_EXPORT_SYMBOL(iwl_uefi_get_sgom_table);
324 #endif /* CONFIG_ACPI */
325