Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 1 | /* sfi_core.c Simple Firmware Interface - core internals */ |
| 2 | |
| 3 | /* |
| 4 | |
| 5 | This file is provided under a dual BSD/GPLv2 license. When using or |
| 6 | redistributing this file, you may do so under either license. |
| 7 | |
| 8 | GPL LICENSE SUMMARY |
| 9 | |
| 10 | Copyright(c) 2009 Intel Corporation. All rights reserved. |
| 11 | |
| 12 | This program is free software; you can redistribute it and/or modify |
| 13 | it under the terms of version 2 of the GNU General Public License as |
| 14 | published by the Free Software Foundation. |
| 15 | |
| 16 | This program is distributed in the hope that it will be useful, but |
| 17 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 19 | General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with this program; if not, write to the Free Software |
| 23 | Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
| 24 | The full GNU General Public License is included in this distribution |
| 25 | in the file called LICENSE.GPL. |
| 26 | |
| 27 | BSD LICENSE |
| 28 | |
| 29 | Copyright(c) 2009 Intel Corporation. All rights reserved. |
| 30 | |
| 31 | Redistribution and use in source and binary forms, with or without |
| 32 | modification, are permitted provided that the following conditions |
| 33 | are met: |
| 34 | |
| 35 | * Redistributions of source code must retain the above copyright |
| 36 | notice, this list of conditions and the following disclaimer. |
| 37 | * Redistributions in binary form must reproduce the above copyright |
| 38 | notice, this list of conditions and the following disclaimer in |
| 39 | the documentation and/or other materials provided with the |
| 40 | distribution. |
| 41 | * Neither the name of Intel Corporation nor the names of its |
| 42 | contributors may be used to endorse or promote products derived |
| 43 | from this software without specific prior written permission. |
| 44 | |
| 45 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 46 | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 47 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 48 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 49 | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 50 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 51 | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 52 | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 53 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 54 | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 55 | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 56 | |
| 57 | */ |
| 58 | |
| 59 | #define KMSG_COMPONENT "SFI" |
| 60 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 61 | |
Mike Rapoport | 57c8a66 | 2018-10-30 15:09:49 -0700 | [diff] [blame] | 62 | #include <linux/memblock.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 63 | #include <linux/kernel.h> |
| 64 | #include <linux/module.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 65 | #include <linux/errno.h> |
| 66 | #include <linux/types.h> |
| 67 | #include <linux/acpi.h> |
| 68 | #include <linux/init.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 69 | #include <linux/sfi.h> |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 70 | #include <linux/slab.h> |
Ingo Molnar | 693bf0a | 2017-07-20 11:23:07 +0200 | [diff] [blame] | 71 | #include <linux/io.h> |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 72 | |
| 73 | #include "sfi_core.h" |
| 74 | |
| 75 | #define ON_SAME_PAGE(addr1, addr2) \ |
| 76 | (((unsigned long)(addr1) & PAGE_MASK) == \ |
| 77 | ((unsigned long)(addr2) & PAGE_MASK)) |
| 78 | #define TABLE_ON_PAGE(page, table, size) (ON_SAME_PAGE(page, table) && \ |
| 79 | ON_SAME_PAGE(page, table + size)) |
| 80 | |
| 81 | int sfi_disabled __read_mostly; |
| 82 | EXPORT_SYMBOL(sfi_disabled); |
| 83 | |
| 84 | static u64 syst_pa __read_mostly; |
| 85 | static struct sfi_table_simple *syst_va __read_mostly; |
| 86 | |
| 87 | /* |
| 88 | * FW creates and saves the SFI tables in memory. When these tables get |
| 89 | * used, they may need to be mapped to virtual address space, and the mapping |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 90 | * can happen before or after the memremap() is ready, so a flag is needed |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 91 | * to indicating this |
| 92 | */ |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 93 | static u32 sfi_use_memremap __read_mostly; |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 94 | |
Rakib Mullick | 01674da | 2009-09-30 16:09:55 -0700 | [diff] [blame] | 95 | /* |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 96 | * sfi_un/map_memory calls early_memremap/memunmap which is a __init function |
Rakib Mullick | 01674da | 2009-09-30 16:09:55 -0700 | [diff] [blame] | 97 | * and introduces section mismatch. So use __ref to make it calm. |
| 98 | */ |
| 99 | static void __iomem * __ref sfi_map_memory(u64 phys, u32 size) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 100 | { |
| 101 | if (!phys || !size) |
| 102 | return NULL; |
| 103 | |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 104 | if (sfi_use_memremap) |
| 105 | return memremap(phys, size, MEMREMAP_WB); |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 106 | else |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 107 | return early_memremap(phys, size); |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 108 | } |
| 109 | |
Rakib Mullick | 01674da | 2009-09-30 16:09:55 -0700 | [diff] [blame] | 110 | static void __ref sfi_unmap_memory(void __iomem *virt, u32 size) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 111 | { |
| 112 | if (!virt || !size) |
| 113 | return; |
| 114 | |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 115 | if (sfi_use_memremap) |
| 116 | memunmap(virt); |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 117 | else |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 118 | early_memunmap(virt, size); |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | static void sfi_print_table_header(unsigned long long pa, |
| 122 | struct sfi_table_header *header) |
| 123 | { |
| 124 | pr_info("%4.4s %llX, %04X (v%d %6.6s %8.8s)\n", |
| 125 | header->sig, pa, |
| 126 | header->len, header->rev, header->oem_id, |
| 127 | header->oem_table_id); |
| 128 | } |
| 129 | |
| 130 | /* |
| 131 | * sfi_verify_table() |
| 132 | * Sanity check table lengh, calculate checksum |
| 133 | */ |
Arjan van de Ven | 011a606 | 2009-10-02 07:29:47 -0700 | [diff] [blame] | 134 | static int sfi_verify_table(struct sfi_table_header *table) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 135 | { |
| 136 | |
| 137 | u8 checksum = 0; |
| 138 | u8 *puchar = (u8 *)table; |
| 139 | u32 length = table->len; |
| 140 | |
| 141 | /* Sanity check table length against arbitrary 1MB limit */ |
| 142 | if (length > 0x100000) { |
| 143 | pr_err("Invalid table length 0x%x\n", length); |
| 144 | return -1; |
| 145 | } |
| 146 | |
| 147 | while (length--) |
| 148 | checksum += *puchar++; |
| 149 | |
| 150 | if (checksum) { |
| 151 | pr_err("Checksum %2.2X should be %2.2X\n", |
| 152 | table->csum, table->csum - checksum); |
| 153 | return -1; |
| 154 | } |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | /* |
| 159 | * sfi_map_table() |
| 160 | * |
| 161 | * Return address of mapped table |
| 162 | * Check for common case that we can re-use mapping to SYST, |
| 163 | * which requires syst_pa, syst_va to be initialized. |
| 164 | */ |
Andy Shevchenko | 108cc2e | 2013-04-30 12:42:50 +0300 | [diff] [blame] | 165 | static struct sfi_table_header *sfi_map_table(u64 pa) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 166 | { |
| 167 | struct sfi_table_header *th; |
| 168 | u32 length; |
| 169 | |
| 170 | if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header))) |
| 171 | th = sfi_map_memory(pa, sizeof(struct sfi_table_header)); |
| 172 | else |
| 173 | th = (void *)syst_va + (pa - syst_pa); |
| 174 | |
| 175 | /* If table fits on same page as its header, we are done */ |
| 176 | if (TABLE_ON_PAGE(th, th, th->len)) |
| 177 | return th; |
| 178 | |
| 179 | /* Entire table does not fit on same page as SYST */ |
| 180 | length = th->len; |
| 181 | if (!TABLE_ON_PAGE(syst_pa, pa, sizeof(struct sfi_table_header))) |
| 182 | sfi_unmap_memory(th, sizeof(struct sfi_table_header)); |
| 183 | |
| 184 | return sfi_map_memory(pa, length); |
| 185 | } |
| 186 | |
| 187 | /* |
| 188 | * sfi_unmap_table() |
| 189 | * |
| 190 | * Undoes effect of sfi_map_table() by unmapping table |
| 191 | * if it did not completely fit on same page as SYST. |
| 192 | */ |
Andy Shevchenko | 108cc2e | 2013-04-30 12:42:50 +0300 | [diff] [blame] | 193 | static void sfi_unmap_table(struct sfi_table_header *th) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 194 | { |
| 195 | if (!TABLE_ON_PAGE(syst_va, th, th->len)) |
| 196 | sfi_unmap_memory(th, TABLE_ON_PAGE(th, th, th->len) ? |
| 197 | sizeof(*th) : th->len); |
| 198 | } |
| 199 | |
| 200 | static int sfi_table_check_key(struct sfi_table_header *th, |
| 201 | struct sfi_table_key *key) |
| 202 | { |
| 203 | |
| 204 | if (strncmp(th->sig, key->sig, SFI_SIGNATURE_SIZE) |
| 205 | || (key->oem_id && strncmp(th->oem_id, |
| 206 | key->oem_id, SFI_OEM_ID_SIZE)) |
| 207 | || (key->oem_table_id && strncmp(th->oem_table_id, |
| 208 | key->oem_table_id, SFI_OEM_TABLE_ID_SIZE))) |
| 209 | return -1; |
| 210 | |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | /* |
| 215 | * This function will be used in 2 cases: |
| 216 | * 1. used to enumerate and verify the tables addressed by SYST/XSDT, |
| 217 | * thus no signature will be given (in kernel boot phase) |
| 218 | * 2. used to parse one specific table, signature must exist, and |
| 219 | * the mapped virt address will be returned, and the virt space |
| 220 | * will be released by call sfi_put_table() later |
| 221 | * |
Rakib Mullick | 01674da | 2009-09-30 16:09:55 -0700 | [diff] [blame] | 222 | * This two cases are from two different functions with two different |
| 223 | * sections and causes section mismatch warning. So use __ref to tell |
| 224 | * modpost not to make any noise. |
| 225 | * |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 226 | * Return value: |
| 227 | * NULL: when can't find a table matching the key |
| 228 | * ERR_PTR(error): error value |
| 229 | * virt table address: when a matched table is found |
| 230 | */ |
Rakib Mullick | 01674da | 2009-09-30 16:09:55 -0700 | [diff] [blame] | 231 | struct sfi_table_header * |
| 232 | __ref sfi_check_table(u64 pa, struct sfi_table_key *key) |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 233 | { |
| 234 | struct sfi_table_header *th; |
| 235 | void *ret = NULL; |
| 236 | |
| 237 | th = sfi_map_table(pa); |
| 238 | if (!th) |
| 239 | return ERR_PTR(-ENOMEM); |
| 240 | |
| 241 | if (!key->sig) { |
| 242 | sfi_print_table_header(pa, th); |
| 243 | if (sfi_verify_table(th)) |
| 244 | ret = ERR_PTR(-EINVAL); |
| 245 | } else { |
| 246 | if (!sfi_table_check_key(th, key)) |
| 247 | return th; /* Success */ |
| 248 | } |
| 249 | |
| 250 | sfi_unmap_table(th); |
| 251 | return ret; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * sfi_get_table() |
| 256 | * |
| 257 | * Search SYST for the specified table with the signature in |
| 258 | * the key, and return the mapped table |
| 259 | */ |
| 260 | struct sfi_table_header *sfi_get_table(struct sfi_table_key *key) |
| 261 | { |
| 262 | struct sfi_table_header *th; |
| 263 | u32 tbl_cnt, i; |
| 264 | |
| 265 | tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64); |
| 266 | for (i = 0; i < tbl_cnt; i++) { |
| 267 | th = sfi_check_table(syst_va->pentry[i], key); |
| 268 | if (!IS_ERR(th) && th) |
| 269 | return th; |
| 270 | } |
| 271 | |
| 272 | return NULL; |
| 273 | } |
| 274 | |
| 275 | void sfi_put_table(struct sfi_table_header *th) |
| 276 | { |
| 277 | sfi_unmap_table(th); |
| 278 | } |
| 279 | |
| 280 | /* Find table with signature, run handler on it */ |
| 281 | int sfi_table_parse(char *signature, char *oem_id, char *oem_table_id, |
| 282 | sfi_table_handler handler) |
| 283 | { |
| 284 | struct sfi_table_header *table = NULL; |
| 285 | struct sfi_table_key key; |
| 286 | int ret = -EINVAL; |
| 287 | |
| 288 | if (sfi_disabled || !handler || !signature) |
| 289 | goto exit; |
| 290 | |
| 291 | key.sig = signature; |
| 292 | key.oem_id = oem_id; |
| 293 | key.oem_table_id = oem_table_id; |
| 294 | |
| 295 | table = sfi_get_table(&key); |
| 296 | if (!table) |
| 297 | goto exit; |
| 298 | |
| 299 | ret = handler(table); |
| 300 | sfi_put_table(table); |
| 301 | exit: |
| 302 | return ret; |
| 303 | } |
| 304 | EXPORT_SYMBOL_GPL(sfi_table_parse); |
| 305 | |
| 306 | /* |
| 307 | * sfi_parse_syst() |
| 308 | * Checksum all the tables in SYST and print their headers |
| 309 | * |
| 310 | * success: set syst_va, return 0 |
| 311 | */ |
| 312 | static int __init sfi_parse_syst(void) |
| 313 | { |
| 314 | struct sfi_table_key key = SFI_ANY_KEY; |
| 315 | int tbl_cnt, i; |
| 316 | void *ret; |
| 317 | |
| 318 | syst_va = sfi_map_memory(syst_pa, sizeof(struct sfi_table_simple)); |
| 319 | if (!syst_va) |
| 320 | return -ENOMEM; |
| 321 | |
| 322 | tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64); |
| 323 | for (i = 0; i < tbl_cnt; i++) { |
| 324 | ret = sfi_check_table(syst_va->pentry[i], &key); |
| 325 | if (IS_ERR(ret)) |
| 326 | return PTR_ERR(ret); |
| 327 | } |
| 328 | |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * The OS finds the System Table by searching 16-byte boundaries between |
| 334 | * physical address 0x000E0000 and 0x000FFFFF. The OS shall search this region |
| 335 | * starting at the low address and shall stop searching when the 1st valid SFI |
| 336 | * System Table is found. |
| 337 | * |
| 338 | * success: set syst_pa, return 0 |
| 339 | * fail: return -1 |
| 340 | */ |
| 341 | static __init int sfi_find_syst(void) |
| 342 | { |
| 343 | unsigned long offset, len; |
| 344 | void *start; |
| 345 | |
| 346 | len = SFI_SYST_SEARCH_END - SFI_SYST_SEARCH_BEGIN; |
| 347 | start = sfi_map_memory(SFI_SYST_SEARCH_BEGIN, len); |
| 348 | if (!start) |
| 349 | return -1; |
| 350 | |
| 351 | for (offset = 0; offset < len; offset += 16) { |
| 352 | struct sfi_table_header *syst_hdr; |
| 353 | |
| 354 | syst_hdr = start + offset; |
| 355 | if (strncmp(syst_hdr->sig, SFI_SIG_SYST, |
| 356 | SFI_SIGNATURE_SIZE)) |
| 357 | continue; |
| 358 | |
| 359 | if (syst_hdr->len > PAGE_SIZE) |
| 360 | continue; |
| 361 | |
| 362 | sfi_print_table_header(SFI_SYST_SEARCH_BEGIN + offset, |
| 363 | syst_hdr); |
| 364 | |
| 365 | if (sfi_verify_table(syst_hdr)) |
| 366 | continue; |
| 367 | |
| 368 | /* |
| 369 | * Enforce SFI spec mandate that SYST reside within a page. |
| 370 | */ |
| 371 | if (!ON_SAME_PAGE(syst_pa, syst_pa + syst_hdr->len)) { |
| 372 | pr_info("SYST 0x%llx + 0x%x crosses page\n", |
| 373 | syst_pa, syst_hdr->len); |
| 374 | continue; |
| 375 | } |
| 376 | |
| 377 | /* Success */ |
| 378 | syst_pa = SFI_SYST_SEARCH_BEGIN + offset; |
| 379 | sfi_unmap_memory(start, len); |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | sfi_unmap_memory(start, len); |
| 384 | return -1; |
| 385 | } |
| 386 | |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 387 | static struct kobject *sfi_kobj; |
| 388 | static struct kobject *tables_kobj; |
| 389 | |
| 390 | static ssize_t sfi_table_show(struct file *filp, struct kobject *kobj, |
| 391 | struct bin_attribute *bin_attr, char *buf, |
| 392 | loff_t offset, size_t count) |
| 393 | { |
| 394 | struct sfi_table_attr *tbl_attr = |
| 395 | container_of(bin_attr, struct sfi_table_attr, attr); |
| 396 | struct sfi_table_header *th = NULL; |
| 397 | struct sfi_table_key key; |
| 398 | ssize_t cnt; |
| 399 | |
| 400 | key.sig = tbl_attr->name; |
| 401 | key.oem_id = NULL; |
| 402 | key.oem_table_id = NULL; |
| 403 | |
| 404 | if (strncmp(SFI_SIG_SYST, tbl_attr->name, SFI_SIGNATURE_SIZE)) { |
| 405 | th = sfi_get_table(&key); |
| 406 | if (!th) |
| 407 | return 0; |
| 408 | |
| 409 | cnt = memory_read_from_buffer(buf, count, &offset, |
| 410 | th, th->len); |
| 411 | sfi_put_table(th); |
| 412 | } else |
| 413 | cnt = memory_read_from_buffer(buf, count, &offset, |
| 414 | syst_va, syst_va->header.len); |
| 415 | |
| 416 | return cnt; |
| 417 | } |
| 418 | |
| 419 | struct sfi_table_attr __init *sfi_sysfs_install_table(u64 pa) |
| 420 | { |
| 421 | struct sfi_table_attr *tbl_attr; |
| 422 | struct sfi_table_header *th; |
| 423 | int ret; |
| 424 | |
| 425 | tbl_attr = kzalloc(sizeof(struct sfi_table_attr), GFP_KERNEL); |
| 426 | if (!tbl_attr) |
| 427 | return NULL; |
| 428 | |
| 429 | th = sfi_map_table(pa); |
| 430 | if (!th || !th->sig[0]) { |
| 431 | kfree(tbl_attr); |
| 432 | return NULL; |
| 433 | } |
| 434 | |
| 435 | sysfs_attr_init(&tbl_attr->attr.attr); |
| 436 | memcpy(tbl_attr->name, th->sig, SFI_SIGNATURE_SIZE); |
| 437 | |
| 438 | tbl_attr->attr.size = 0; |
| 439 | tbl_attr->attr.read = sfi_table_show; |
| 440 | tbl_attr->attr.attr.name = tbl_attr->name; |
| 441 | tbl_attr->attr.attr.mode = 0400; |
| 442 | |
| 443 | ret = sysfs_create_bin_file(tables_kobj, |
| 444 | &tbl_attr->attr); |
Dan Carpenter | e29df91 | 2010-05-28 12:33:15 +0200 | [diff] [blame] | 445 | if (ret) { |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 446 | kfree(tbl_attr); |
Dan Carpenter | e29df91 | 2010-05-28 12:33:15 +0200 | [diff] [blame] | 447 | tbl_attr = NULL; |
| 448 | } |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 449 | |
| 450 | sfi_unmap_table(th); |
| 451 | return tbl_attr; |
| 452 | } |
| 453 | |
| 454 | static int __init sfi_sysfs_init(void) |
| 455 | { |
| 456 | int tbl_cnt, i; |
| 457 | |
| 458 | if (sfi_disabled) |
| 459 | return 0; |
| 460 | |
| 461 | sfi_kobj = kobject_create_and_add("sfi", firmware_kobj); |
| 462 | if (!sfi_kobj) |
| 463 | return 0; |
| 464 | |
| 465 | tables_kobj = kobject_create_and_add("tables", sfi_kobj); |
| 466 | if (!tables_kobj) { |
| 467 | kobject_put(sfi_kobj); |
| 468 | return 0; |
| 469 | } |
| 470 | |
| 471 | sfi_sysfs_install_table(syst_pa); |
| 472 | |
| 473 | tbl_cnt = SFI_GET_NUM_ENTRIES(syst_va, u64); |
| 474 | |
| 475 | for (i = 0; i < tbl_cnt; i++) |
| 476 | sfi_sysfs_install_table(syst_va->pentry[i]); |
| 477 | |
| 478 | sfi_acpi_sysfs_init(); |
| 479 | kobject_uevent(sfi_kobj, KOBJ_ADD); |
| 480 | kobject_uevent(tables_kobj, KOBJ_ADD); |
| 481 | pr_info("SFI sysfs interfaces init success\n"); |
| 482 | return 0; |
| 483 | } |
| 484 | |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 485 | void __init sfi_init(void) |
| 486 | { |
| 487 | if (!acpi_disabled) |
| 488 | disable_sfi(); |
| 489 | |
| 490 | if (sfi_disabled) |
| 491 | return; |
| 492 | |
Feng Tang | 5487ab4 | 2010-05-25 16:40:47 +0800 | [diff] [blame] | 493 | pr_info("Simple Firmware Interface v0.81 http://simplefirmware.org\n"); |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 494 | |
| 495 | if (sfi_find_syst() || sfi_parse_syst() || sfi_platform_init()) |
| 496 | disable_sfi(); |
| 497 | |
| 498 | return; |
| 499 | } |
| 500 | |
| 501 | void __init sfi_init_late(void) |
| 502 | { |
| 503 | int length; |
| 504 | |
| 505 | if (sfi_disabled) |
| 506 | return; |
| 507 | |
| 508 | length = syst_va->header.len; |
| 509 | sfi_unmap_memory(syst_va, sizeof(struct sfi_table_simple)); |
| 510 | |
Tom Lendacky | f7750a7 | 2017-07-17 16:10:00 -0500 | [diff] [blame] | 511 | /* Use memremap now after it is ready */ |
| 512 | sfi_use_memremap = 1; |
Feng Tang | 6ae6996 | 2009-08-14 15:13:46 -0400 | [diff] [blame] | 513 | syst_va = sfi_map_memory(syst_pa, length); |
| 514 | |
| 515 | sfi_acpi_init(); |
| 516 | } |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 517 | |
| 518 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 519 | * The reason we put it here because we need wait till the /sys/firmware |
Feng Tang | dce80a5 | 2010-05-26 11:28:08 +0800 | [diff] [blame] | 520 | * is setup, then our interface can be registered in /sys/firmware/sfi |
| 521 | */ |
| 522 | core_initcall(sfi_sysfs_init); |