1/* 2 * Intel CPU Microcode Update Driver for Linux 3 * 4 * Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk> 5 * 2006 Shaohua Li <shaohua.li@intel.com> 6 * 7 * This driver allows to upgrade microcode on Intel processors 8 * belonging to IA-32 family - PentiumPro, Pentium II, 9 * Pentium III, Xeon, Pentium 4, etc. 10 * 11 * Reference: Section 8.10 of Volume III, Intel Pentium 4 Manual, 12 * Order Number 245472 or free download from: 13 * 14 * http://developer.intel.com/design/pentium4/manuals/245472.htm 15 * 16 * For more information, go to http://www.urbanmyth.org/microcode 17 * 18 * This program is free software; you can redistribute it and/or 19 * modify it under the terms of the GNU General Public License 20 * as published by the Free Software Foundation; either version 21 * 2 of the License, or (at your option) any later version. 22 * 23 * 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com> 24 * Initial release. 25 * 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com> 26 * Added read() support + cleanups. 27 * 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com> 28 * Added 'device trimming' support. open(O_WRONLY) zeroes 29 * and frees the saved copy of applied microcode. 30 * 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com> 31 * Made to use devfs (/dev/cpu/microcode) + cleanups. 32 * 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com> 33 * Added misc device support (now uses both devfs and misc). 34 * Added MICROCODE_IOCFREE ioctl to clear memory. 35 * 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com> 36 * Messages for error cases (non Intel & no suitable microcode). 37 * 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com> 38 * Removed ->release(). Removed exclusive open and status bitmap. 39 * Added microcode_rwsem to serialize read()/write()/ioctl(). 40 * Removed global kernel lock usage. 41 * 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com> 42 * Write 0 to 0x8B msr and then cpuid before reading revision, 43 * so that it works even if there were no update done by the 44 * BIOS. Otherwise, reading from 0x8B gives junk (which happened 45 * to be 0 on my machine which is why it worked even when I 46 * disabled update by the BIOS) 47 * Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix. 48 * 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and 49 * Tigran Aivazian <tigran@veritas.com> 50 * Intel Pentium 4 processor support and bugfixes. 51 * 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com> 52 * Bugfix for HT (Hyper-Threading) enabled processors 53 * whereby processor resources are shared by all logical processors 54 * in a single CPU package. 55 * 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and 56 * Tigran Aivazian <tigran@veritas.com>, 57 * Serialize updates as required on HT processors due to speculative 58 * nature of implementation. 59 * 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com> 60 * Fix the panic when writing zero-length microcode chunk. 61 * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>, 62 * Jun Nakajima <jun.nakajima@intel.com> 63 * Support for the microcode updates in the new format. 64 * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com> 65 * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl 66 * because we no longer hold a copy of applied microcode 67 * in kernel memory. 68 * 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com> 69 * Fix sigmatch() macro to handle old CPUs with pf == 0. 70 * Thanks to Stuart Swales for pointing out this bug. 71 */ 72 73//#define DEBUG /* pr_debug */ 74#include <linux/capability.h> 75#include <linux/kernel.h> 76#include <linux/init.h> 77#include <linux/sched.h> 78#include <linux/cpumask.h> 79#include <linux/module.h> 80#include <linux/slab.h> 81#include <linux/vmalloc.h> 82#include <linux/miscdevice.h> 83#include <linux/spinlock.h> 84#include <linux/mm.h> 85#include <linux/mutex.h> 86#include <linux/cpu.h> 87#include <linux/firmware.h> 88#include <linux/platform_device.h> 89 90#include <asm/msr.h> 91#include <asm/uaccess.h> 92#include <asm/processor.h> 93 94MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver"); 95MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>"); 96MODULE_LICENSE("GPL"); 97 98#define MICROCODE_VERSION "1.14a" 99 100#define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */ 101#define MC_HEADER_SIZE (sizeof (microcode_header_t)) /* 48 bytes */ 102#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */ 103#define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */ 104#define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */ 105#define DWSIZE (sizeof (u32)) 106#define get_totalsize(mc) \ 107 (((microcode_t *)mc)->hdr.totalsize ? \ 108 ((microcode_t *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE) 109#define get_datasize(mc) \ 110 (((microcode_t *)mc)->hdr.datasize ? \ 111 ((microcode_t *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE) 112 113#define sigmatch(s1, s2, p1, p2) \ 114 (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0)))) 115 116#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE) 117 118/* serialize access to the physical write to MSR 0x79 */ 119static DEFINE_SPINLOCK(microcode_update_lock); 120 121/* no concurrent ->write()s are allowed on /dev/cpu/microcode */ 122static DEFINE_MUTEX(microcode_mutex); 123 124static struct ucode_cpu_info { 125 int valid; 126 unsigned int sig; 127 unsigned int pf; 128 unsigned int rev; 129 microcode_t *mc; 130} ucode_cpu_info[NR_CPUS]; 131 132static void collect_cpu_info(int cpu_num) 133{ 134 struct cpuinfo_x86 *c = cpu_data + cpu_num; 135 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num; 136 unsigned int val[2]; 137 138 /* We should bind the task to the CPU */ 139 BUG_ON(raw_smp_processor_id() != cpu_num); 140 uci->pf = uci->rev = 0; 141 uci->mc = NULL; 142 uci->valid = 1; 143 144 if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 || 145 cpu_has(c, X86_FEATURE_IA64)) { 146 printk(KERN_ERR "microcode: CPU%d not a capable Intel " 147 "processor\n", cpu_num); 148 uci->valid = 0; 149 return; 150 } 151 152 uci->sig = cpuid_eax(0x00000001); 153 154 if ((c->x86_model >= 5) || (c->x86 > 6)) { 155 /* get processor flags from MSR 0x17 */ 156 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]); 157 uci->pf = 1 << ((val[1] >> 18) & 7); 158 } 159 160 wrmsr(MSR_IA32_UCODE_REV, 0, 0); 161 /* see notes above for revision 1.07. Apparent chip bug */ 162 sync_core(); 163 /* get the current revision from MSR 0x8B */ 164 rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev); 165 pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n", 166 uci->sig, uci->pf, uci->rev); 167} 168 169static inline int microcode_update_match(int cpu_num, 170 microcode_header_t *mc_header, int sig, int pf) 171{ 172 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num; 173 174 if (!sigmatch(sig, uci->sig, pf, uci->pf) 175 || mc_header->rev <= uci->rev) 176 return 0; 177 return 1; 178} 179 180static int microcode_sanity_check(void *mc) 181{ 182 microcode_header_t *mc_header = mc; 183 struct extended_sigtable *ext_header = NULL; 184 struct extended_signature *ext_sig; 185 unsigned long total_size, data_size, ext_table_size; 186 int sum, orig_sum, ext_sigcount = 0, i; 187 188 total_size = get_totalsize(mc_header); 189 data_size = get_datasize(mc_header); 190 if (data_size + MC_HEADER_SIZE > total_size) { 191 printk(KERN_ERR "microcode: error! " 192 "Bad data size in microcode data file\n"); 193 return -EINVAL; 194 } 195 196 if (mc_header->ldrver != 1 || mc_header->hdrver != 1) { 197 printk(KERN_ERR "microcode: error! " 198 "Unknown microcode update format\n"); 199 return -EINVAL; 200 } 201 ext_table_size = total_size - (MC_HEADER_SIZE + data_size); 202 if (ext_table_size) { 203 if ((ext_table_size < EXT_HEADER_SIZE) 204 || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) { 205 printk(KERN_ERR "microcode: error! " 206 "Small exttable size in microcode data file\n"); 207 return -EINVAL; 208 } 209 ext_header = mc + MC_HEADER_SIZE + data_size; 210 if (ext_table_size != exttable_size(ext_header)) { 211 printk(KERN_ERR "microcode: error! " 212 "Bad exttable size in microcode data file\n"); 213 return -EFAULT; 214 } 215 ext_sigcount = ext_header->count; 216 } 217 218 /* check extended table checksum */ 219 if (ext_table_size) { 220 int ext_table_sum = 0; 221 int *ext_tablep = (int *)ext_header; 222 223 i = ext_table_size / DWSIZE; 224 while (i--) 225 ext_table_sum += ext_tablep[i]; 226 if (ext_table_sum) { 227 printk(KERN_WARNING "microcode: aborting, " 228 "bad extended signature table checksum\n"); 229 return -EINVAL; 230 } 231 } 232 233 /* calculate the checksum */ 234 orig_sum = 0; 235 i = (MC_HEADER_SIZE + data_size) / DWSIZE; 236 while (i--) 237 orig_sum += ((int *)mc)[i]; 238 if (orig_sum) { 239 printk(KERN_ERR "microcode: aborting, bad checksum\n"); 240 return -EINVAL; 241 } 242 if (!ext_table_size) 243 return 0; 244 /* check extended signature checksum */ 245 for (i = 0; i < ext_sigcount; i++) { 246 ext_sig = (struct extended_signature *)((void *)ext_header 247 + EXT_HEADER_SIZE + EXT_SIGNATURE_SIZE * i); 248 sum = orig_sum 249 - (mc_header->sig + mc_header->pf + mc_header->cksum) 250 + (ext_sig->sig + ext_sig->pf + ext_sig->cksum); 251 if (sum) { 252 printk(KERN_ERR "microcode: aborting, bad checksum\n"); 253 return -EINVAL; 254 } 255 } 256 return 0; 257} 258 259/* 260 * return 0 - no update found 261 * return 1 - found update 262 * return < 0 - error 263 */ 264static int get_maching_microcode(void *mc, int cpu) 265{ 266 struct ucode_cpu_info *uci = ucode_cpu_info + cpu; 267 microcode_header_t *mc_header = mc; 268 struct extended_sigtable *ext_header; 269 unsigned long total_size = get_totalsize(mc_header); 270 int ext_sigcount, i; 271 struct extended_signature *ext_sig; 272 void *new_mc; 273 274 if (microcode_update_match(cpu, mc_header, 275 mc_header->sig, mc_header->pf)) 276 goto find; 277 278 if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE) 279 return 0; 280 281 ext_header = (struct extended_sigtable *)(mc + 282 get_datasize(mc_header) + MC_HEADER_SIZE); 283 ext_sigcount = ext_header->count; 284 ext_sig = (struct extended_signature *)((void *)ext_header 285 + EXT_HEADER_SIZE); 286 for (i = 0; i < ext_sigcount; i++) { 287 if (microcode_update_match(cpu, mc_header, 288 ext_sig->sig, ext_sig->pf)) 289 goto find; 290 ext_sig++; 291 } 292 return 0; 293find: 294 pr_debug("microcode: CPU %d found a matching microcode update with" 295 " version 0x%x (current=0x%x)\n", cpu, mc_header->rev,uci->rev); 296 new_mc = vmalloc(total_size); 297 if (!new_mc) { 298 printk(KERN_ERR "microcode: error! Can not allocate memory\n"); 299 return -ENOMEM; 300 } 301 302 /* free previous update file */ 303 vfree(uci->mc); 304 305 memcpy(new_mc, mc, total_size); 306 uci->mc = new_mc; 307 return 1; 308} 309 310static void apply_microcode(int cpu) 311{ 312 unsigned long flags; 313 unsigned int val[2]; 314 int cpu_num = raw_smp_processor_id(); 315 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num; 316 317 /* We should bind the task to the CPU */ 318 BUG_ON(cpu_num != cpu); 319 320 if (uci->mc == NULL) 321 return; 322 323 /* serialize access to the physical write to MSR 0x79 */ 324 spin_lock_irqsave(µcode_update_lock, flags); 325 326 /* write microcode via MSR 0x79 */ 327 wrmsr(MSR_IA32_UCODE_WRITE, 328 (unsigned long) uci->mc->bits, 329 (unsigned long) uci->mc->bits >> 16 >> 16); 330 wrmsr(MSR_IA32_UCODE_REV, 0, 0); 331 332 /* see notes above for revision 1.07. Apparent chip bug */ 333 sync_core(); 334 335 /* get the current revision from MSR 0x8B */ 336 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]); 337 338 spin_unlock_irqrestore(µcode_update_lock, flags); 339 if (val[1] != uci->mc->hdr.rev) { 340 printk(KERN_ERR "microcode: CPU%d updated from revision " 341 "0x%x to 0x%x failed\n", cpu_num, uci->rev, val[1]); 342 return; 343 } 344 pr_debug("microcode: CPU%d updated from revision " 345 "0x%x to 0x%x, date = %08x \n", 346 cpu_num, uci->rev, val[1], uci->mc->hdr.date); 347 uci->rev = val[1]; 348} 349 350#ifdef CONFIG_MICROCODE_OLD_INTERFACE 351static void __user *user_buffer; /* user area microcode data buffer */ 352static unsigned int user_buffer_size; /* it's size */ 353 354static long get_next_ucode(void **mc, long offset) 355{ 356 microcode_header_t mc_header; 357 unsigned long total_size; 358 359 /* No more data */ 360 if (offset >= user_buffer_size) 361 return 0; 362 if (copy_from_user(&mc_header, user_buffer + offset, MC_HEADER_SIZE)) { 363 printk(KERN_ERR "microcode: error! Can not read user data\n"); 364 return -EFAULT; 365 } 366 total_size = get_totalsize(&mc_header); 367 if (offset + total_size > user_buffer_size) { 368 printk(KERN_ERR "microcode: error! Bad total size in microcode " 369 "data file\n"); 370 return -EINVAL; 371 } 372 *mc = vmalloc(total_size); 373 if (!*mc) 374 return -ENOMEM; 375 if (copy_from_user(*mc, user_buffer + offset, total_size)) { 376 printk(KERN_ERR "microcode: error! Can not read user data\n"); 377 vfree(*mc); 378 return -EFAULT; 379 } 380 return offset + total_size; 381} 382 383static int do_microcode_update (void) 384{ 385 long cursor = 0; 386 int error = 0; 387 void *new_mc = NULL; 388 int cpu; 389 cpumask_t old; 390 391 old = current->cpus_allowed; 392 393 while ((cursor = get_next_ucode(&new_mc, cursor)) > 0) { 394 error = microcode_sanity_check(new_mc); 395 if (error) 396 goto out; 397 /* 398 * It's possible the data file has multiple matching ucode, 399 * lets keep searching till the latest version 400 */ 401 for_each_online_cpu(cpu) { 402 struct ucode_cpu_info *uci = ucode_cpu_info + cpu; 403 404 if (!uci->valid) 405 continue; 406 set_cpus_allowed(current, cpumask_of_cpu(cpu)); 407 error = get_maching_microcode(new_mc, cpu); 408 if (error < 0) 409 goto out; 410 if (error == 1) 411 apply_microcode(cpu); 412 } 413 vfree(new_mc); 414 } 415out: 416 if (cursor > 0) 417 vfree(new_mc); 418 if (cursor < 0) 419 error = cursor; 420 set_cpus_allowed(current, old); 421 return error; 422} 423 424static int microcode_open (struct inode *unused1, struct file *unused2) 425{ 426 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; 427} 428 429static ssize_t microcode_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos) 430{ 431 ssize_t ret; 432 433 if ((len >> PAGE_SHIFT) > num_physpages) { 434 printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages); 435 return -EINVAL; 436 } 437 438 lock_cpu_hotplug(); 439 mutex_lock(µcode_mutex); 440 441 user_buffer = (void __user *) buf; 442 user_buffer_size = (int) len; 443 444 ret = do_microcode_update(); 445 if (!ret) 446 ret = (ssize_t)len; 447 448 mutex_unlock(µcode_mutex); 449 unlock_cpu_hotplug(); 450 451 return ret; 452} 453 454static const struct file_operations microcode_fops = { 455 .owner = THIS_MODULE, 456 .write = microcode_write, 457 .open = microcode_open, 458}; 459 460static struct miscdevice microcode_dev = { 461 .minor = MICROCODE_MINOR, 462 .name = "microcode", 463 .fops = µcode_fops, 464}; 465 466static int __init microcode_dev_init (void) 467{ 468 int error; 469 470 error = misc_register(µcode_dev); 471 if (error) { 472 printk(KERN_ERR 473 "microcode: can't misc_register on minor=%d\n", 474 MICROCODE_MINOR); 475 return error; 476 } 477 478 return 0; 479} 480 481static void microcode_dev_exit (void) 482{ 483 misc_deregister(µcode_dev); 484} 485 486MODULE_ALIAS_MISCDEV(MICROCODE_MINOR); 487#else 488#define microcode_dev_init() 0 489#define microcode_dev_exit() do { } while(0) 490#endif 491 492static long get_next_ucode_from_buffer(void **mc, void *buf, 493 unsigned long size, long offset) 494{ 495 microcode_header_t *mc_header; 496 unsigned long total_size; 497 498 /* No more data */ 499 if (offset >= size) 500 return 0; 501 mc_header = (microcode_header_t *)(buf + offset); 502 total_size = get_totalsize(mc_header); 503 504 if (offset + total_size > size) { 505 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n"); 506 return -EINVAL; 507 } 508 509 *mc = vmalloc(total_size); 510 if (!*mc) { 511 printk(KERN_ERR "microcode: error! Can not allocate memory\n"); 512 return -ENOMEM; 513 } 514 memcpy(*mc, buf + offset, total_size); 515 return offset + total_size; 516} 517 518/* fake device for request_firmware */ 519static struct platform_device *microcode_pdev; 520 521static int cpu_request_microcode(int cpu) 522{ 523 char name[30]; 524 struct cpuinfo_x86 *c = cpu_data + cpu; 525 const struct firmware *firmware; 526 void *buf; 527 unsigned long size; 528 long offset = 0; 529 int error; 530 void *mc; 531 532 /* We should bind the task to the CPU */ 533 BUG_ON(cpu != raw_smp_processor_id()); 534 sprintf(name,"intel-ucode/%02x-%02x-%02x", 535 c->x86, c->x86_model, c->x86_mask); 536 error = request_firmware(&firmware, name, µcode_pdev->dev); 537 if (error) { 538 pr_debug("ucode data file %s load failed\n", name); 539 return error; 540 } 541 buf = (void *)firmware->data; 542 size = firmware->size; 543 while ((offset = get_next_ucode_from_buffer(&mc, buf, size, offset)) 544 > 0) { 545 error = microcode_sanity_check(mc); 546 if (error) 547 break; 548 error = get_maching_microcode(mc, cpu); 549 if (error < 0) 550 break; 551 /* 552 * It's possible the data file has multiple matching ucode, 553 * lets keep searching till the latest version 554 */ 555 if (error == 1) { 556 apply_microcode(cpu); 557 error = 0; 558 } 559 vfree(mc); 560 } 561 if (offset > 0) 562 vfree(mc); 563 if (offset < 0) 564 error = offset; 565 release_firmware(firmware); 566 567 return error; 568} 569 570static int apply_microcode_check_cpu(int cpu) 571{ 572 struct cpuinfo_x86 *c = cpu_data + cpu; 573 struct ucode_cpu_info *uci = ucode_cpu_info + cpu; 574 cpumask_t old; 575 unsigned int val[2]; 576 int err = 0; 577 578 /* Check if the microcode is available */ 579 if (!uci->mc) 580 return 0; 581 582 old = current->cpus_allowed; 583 set_cpus_allowed(current, cpumask_of_cpu(cpu)); 584 585 /* Check if the microcode we have in memory matches the CPU */ 586 if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 || 587 cpu_has(c, X86_FEATURE_IA64) || uci->sig != cpuid_eax(0x00000001)) 588 err = -EINVAL; 589 590 if (!err && ((c->x86_model >= 5) || (c->x86 > 6))) { 591 /* get processor flags from MSR 0x17 */ 592 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]); 593 if (uci->pf != (1 << ((val[1] >> 18) & 7))) 594 err = -EINVAL; 595 } 596 597 if (!err) { 598 wrmsr(MSR_IA32_UCODE_REV, 0, 0); 599 /* see notes above for revision 1.07. Apparent chip bug */ 600 sync_core(); 601 /* get the current revision from MSR 0x8B */ 602 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]); 603 if (uci->rev != val[1]) 604 err = -EINVAL; 605 } 606 607 if (!err) 608 apply_microcode(cpu); 609 else 610 printk(KERN_ERR "microcode: Could not apply microcode to CPU%d:" 611 " sig=0x%x, pf=0x%x, rev=0x%x\n", 612 cpu, uci->sig, uci->pf, uci->rev); 613 614 set_cpus_allowed(current, old); 615 return err; 616} 617 618static void microcode_init_cpu(int cpu, int resume) 619{ 620 cpumask_t old; 621 struct ucode_cpu_info *uci = ucode_cpu_info + cpu; 622 623 old = current->cpus_allowed; 624 625 set_cpus_allowed(current, cpumask_of_cpu(cpu)); 626 mutex_lock(µcode_mutex); 627 collect_cpu_info(cpu); 628 if (uci->valid && system_state == SYSTEM_RUNNING && !resume) 629 cpu_request_microcode(cpu); 630 mutex_unlock(µcode_mutex); 631 set_cpus_allowed(current, old); 632} 633 634static void microcode_fini_cpu(int cpu) 635{ 636 struct ucode_cpu_info *uci = ucode_cpu_info + cpu; 637 638 mutex_lock(µcode_mutex); 639 uci->valid = 0; 640 vfree(uci->mc); 641 uci->mc = NULL; 642 mutex_unlock(µcode_mutex); 643} 644 645static ssize_t reload_store(struct sys_device *dev, const char *buf, size_t sz) 646{ 647 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id; 648 char *end; 649 unsigned long val = simple_strtoul(buf, &end, 0); 650 int err = 0; 651 int cpu = dev->id; 652 653 if (end == buf) 654 return -EINVAL; 655 if (val == 1) { 656 cpumask_t old; 657 658 old = current->cpus_allowed; 659 660 lock_cpu_hotplug(); 661 set_cpus_allowed(current, cpumask_of_cpu(cpu)); 662 663 mutex_lock(µcode_mutex); 664 if (uci->valid) 665 err = cpu_request_microcode(cpu); 666 mutex_unlock(µcode_mutex); 667 unlock_cpu_hotplug(); 668 set_cpus_allowed(current, old); 669 } 670 if (err) 671 return err; 672 return sz; 673} 674 675static ssize_t version_show(struct sys_device *dev, char *buf) 676{ 677 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id; 678 679 return sprintf(buf, "0x%x\n", uci->rev); 680} 681 682static ssize_t pf_show(struct sys_device *dev, char *buf) 683{ 684 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id; 685 686 return sprintf(buf, "0x%x\n", uci->pf); 687} 688 689static SYSDEV_ATTR(reload, 0200, NULL, reload_store); 690static SYSDEV_ATTR(version, 0400, version_show, NULL); 691static SYSDEV_ATTR(processor_flags, 0400, pf_show, NULL); 692 693static struct attribute *mc_default_attrs[] = { 694 &attr_reload.attr, 695 &attr_version.attr, 696 &attr_processor_flags.attr, 697 NULL 698}; 699 700static struct attribute_group mc_attr_group = { 701 .attrs = mc_default_attrs, 702 .name = "microcode", 703}; 704 705static int __mc_sysdev_add(struct sys_device *sys_dev, int resume) 706{ 707 int err, cpu = sys_dev->id; 708 struct ucode_cpu_info *uci = ucode_cpu_info + cpu; 709 710 if (!cpu_online(cpu)) 711 return 0; 712 713 pr_debug("Microcode:CPU %d added\n", cpu); 714 memset(uci, 0, sizeof(*uci)); 715 716 err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group); 717 if (err) 718 return err; 719 720 microcode_init_cpu(cpu, resume); 721 722 return 0; 723} 724 725static int mc_sysdev_add(struct sys_device *sys_dev) 726{ 727 return __mc_sysdev_add(sys_dev, 0); 728} 729 730static int mc_sysdev_remove(struct sys_device *sys_dev) 731{ 732 int cpu = sys_dev->id; 733 734 if (!cpu_online(cpu)) 735 return 0; 736 737 pr_debug("Microcode:CPU %d removed\n", cpu); 738 microcode_fini_cpu(cpu); 739 sysfs_remove_group(&sys_dev->kobj, &mc_attr_group); 740 return 0; 741} 742 743static int mc_sysdev_resume(struct sys_device *dev) 744{ 745 int cpu = dev->id; 746 747 if (!cpu_online(cpu)) 748 return 0; 749 pr_debug("Microcode:CPU %d resumed\n", cpu); 750 /* only CPU 0 will apply ucode here */ 751 apply_microcode(0); 752 return 0; 753} 754 755static struct sysdev_driver mc_sysdev_driver = { 756 .add = mc_sysdev_add, 757 .remove = mc_sysdev_remove, 758 .resume = mc_sysdev_resume, 759}; 760 761static __cpuinit int 762mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu) 763{ 764 unsigned int cpu = (unsigned long)hcpu; 765 struct sys_device *sys_dev; 766 767 sys_dev = get_cpu_sysdev(cpu); 768 switch (action) { 769 case CPU_UP_CANCELED_FROZEN: 770 /* The CPU refused to come up during a system resume */ 771 microcode_fini_cpu(cpu); 772 break; 773 case CPU_ONLINE: 774 case CPU_DOWN_FAILED: 775 mc_sysdev_add(sys_dev); 776 break; 777 case CPU_ONLINE_FROZEN: 778 /* System-wide resume is in progress, try to apply microcode */ 779 if (apply_microcode_check_cpu(cpu)) { 780 /* The application of microcode failed */ 781 microcode_fini_cpu(cpu); 782 __mc_sysdev_add(sys_dev, 1); 783 break; 784 } 785 case CPU_DOWN_FAILED_FROZEN: 786 if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group)) 787 printk(KERN_ERR "Microcode: Failed to create the sysfs " 788 "group for CPU%d\n", cpu); 789 break; 790 case CPU_DOWN_PREPARE: 791 mc_sysdev_remove(sys_dev); 792 break; 793 case CPU_DOWN_PREPARE_FROZEN: 794 /* Suspend is in progress, only remove the interface */ 795 sysfs_remove_group(&sys_dev->kobj, &mc_attr_group); 796 break; 797 } 798 return NOTIFY_OK; 799} 800 801static struct notifier_block __cpuinitdata mc_cpu_notifier = { 802 .notifier_call = mc_cpu_callback, 803}; 804 805static int __init microcode_init (void) 806{ 807 int error; 808 809 error = microcode_dev_init(); 810 if (error) 811 return error; 812 microcode_pdev = platform_device_register_simple("microcode", -1, 813 NULL, 0); 814 if (IS_ERR(microcode_pdev)) { 815 microcode_dev_exit(); 816 return PTR_ERR(microcode_pdev); 817 } 818 819 lock_cpu_hotplug(); 820 error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver); 821 unlock_cpu_hotplug(); 822 if (error) { 823 microcode_dev_exit(); 824 platform_device_unregister(microcode_pdev); 825 return error; 826 } 827 828 register_hotcpu_notifier(&mc_cpu_notifier); 829 830 printk(KERN_INFO 831 "IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@aivazian.fsnet.co.uk>\n"); 832 return 0; 833} 834 835static void __exit microcode_exit (void) 836{ 837 microcode_dev_exit(); 838 839 unregister_hotcpu_notifier(&mc_cpu_notifier); 840 841 lock_cpu_hotplug(); 842 sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver); 843 unlock_cpu_hotplug(); 844 845 platform_device_unregister(microcode_pdev); 846} 847 848module_init(microcode_init) 849module_exit(microcode_exit) 850