aboutsummaryrefslogtreecommitdiffstats
path: root/arch/i386/kernel/microcode.c
diff options
context:
space:
mode:
authorThomas Gleixner <tglx@linutronix.de>2007-10-11 05:17:01 -0400
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 05:17:01 -0400
commit9a163ed8e0552fdcffe405d2ea7134819a81456e (patch)
treeb322fd2afbb812ba7ddfd22f3734aaab007c2aa5 /arch/i386/kernel/microcode.c
parentf7627e2513987bb5d4e8cb13c4e0a478352141ac (diff)
i386: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/i386/kernel/microcode.c')
-rw-r--r--arch/i386/kernel/microcode.c850
1 files changed, 0 insertions, 850 deletions
diff --git a/arch/i386/kernel/microcode.c b/arch/i386/kernel/microcode.c
deleted file mode 100644
index 09cf78110358..000000000000
--- a/arch/i386/kernel/microcode.c
+++ /dev/null
@@ -1,850 +0,0 @@
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/fs.h>
86#include <linux/mutex.h>
87#include <linux/cpu.h>
88#include <linux/firmware.h>
89#include <linux/platform_device.h>
90
91#include <asm/msr.h>
92#include <asm/uaccess.h>
93#include <asm/processor.h>
94
95MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
96MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
97MODULE_LICENSE("GPL");
98
99#define MICROCODE_VERSION "1.14a"
100
101#define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
102#define MC_HEADER_SIZE (sizeof (microcode_header_t)) /* 48 bytes */
103#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
104#define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */
105#define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */
106#define DWSIZE (sizeof (u32))
107#define get_totalsize(mc) \
108 (((microcode_t *)mc)->hdr.totalsize ? \
109 ((microcode_t *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
110#define get_datasize(mc) \
111 (((microcode_t *)mc)->hdr.datasize ? \
112 ((microcode_t *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
113
114#define sigmatch(s1, s2, p1, p2) \
115 (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
116
117#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
118
119/* serialize access to the physical write to MSR 0x79 */
120static DEFINE_SPINLOCK(microcode_update_lock);
121
122/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
123static DEFINE_MUTEX(microcode_mutex);
124
125static struct ucode_cpu_info {
126 int valid;
127 unsigned int sig;
128 unsigned int pf;
129 unsigned int rev;
130 microcode_t *mc;
131} ucode_cpu_info[NR_CPUS];
132
133static void collect_cpu_info(int cpu_num)
134{
135 struct cpuinfo_x86 *c = cpu_data + cpu_num;
136 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
137 unsigned int val[2];
138
139 /* We should bind the task to the CPU */
140 BUG_ON(raw_smp_processor_id() != cpu_num);
141 uci->pf = uci->rev = 0;
142 uci->mc = NULL;
143 uci->valid = 1;
144
145 if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
146 cpu_has(c, X86_FEATURE_IA64)) {
147 printk(KERN_ERR "microcode: CPU%d not a capable Intel "
148 "processor\n", cpu_num);
149 uci->valid = 0;
150 return;
151 }
152
153 uci->sig = cpuid_eax(0x00000001);
154
155 if ((c->x86_model >= 5) || (c->x86 > 6)) {
156 /* get processor flags from MSR 0x17 */
157 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
158 uci->pf = 1 << ((val[1] >> 18) & 7);
159 }
160
161 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
162 /* see notes above for revision 1.07. Apparent chip bug */
163 sync_core();
164 /* get the current revision from MSR 0x8B */
165 rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
166 pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
167 uci->sig, uci->pf, uci->rev);
168}
169
170static inline int microcode_update_match(int cpu_num,
171 microcode_header_t *mc_header, int sig, int pf)
172{
173 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
174
175 if (!sigmatch(sig, uci->sig, pf, uci->pf)
176 || mc_header->rev <= uci->rev)
177 return 0;
178 return 1;
179}
180
181static int microcode_sanity_check(void *mc)
182{
183 microcode_header_t *mc_header = mc;
184 struct extended_sigtable *ext_header = NULL;
185 struct extended_signature *ext_sig;
186 unsigned long total_size, data_size, ext_table_size;
187 int sum, orig_sum, ext_sigcount = 0, i;
188
189 total_size = get_totalsize(mc_header);
190 data_size = get_datasize(mc_header);
191 if (data_size + MC_HEADER_SIZE > total_size) {
192 printk(KERN_ERR "microcode: error! "
193 "Bad data size in microcode data file\n");
194 return -EINVAL;
195 }
196
197 if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
198 printk(KERN_ERR "microcode: error! "
199 "Unknown microcode update format\n");
200 return -EINVAL;
201 }
202 ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
203 if (ext_table_size) {
204 if ((ext_table_size < EXT_HEADER_SIZE)
205 || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
206 printk(KERN_ERR "microcode: error! "
207 "Small exttable size in microcode data file\n");
208 return -EINVAL;
209 }
210 ext_header = mc + MC_HEADER_SIZE + data_size;
211 if (ext_table_size != exttable_size(ext_header)) {
212 printk(KERN_ERR "microcode: error! "
213 "Bad exttable size in microcode data file\n");
214 return -EFAULT;
215 }
216 ext_sigcount = ext_header->count;
217 }
218
219 /* check extended table checksum */
220 if (ext_table_size) {
221 int ext_table_sum = 0;
222 int *ext_tablep = (int *)ext_header;
223
224 i = ext_table_size / DWSIZE;
225 while (i--)
226 ext_table_sum += ext_tablep[i];
227 if (ext_table_sum) {
228 printk(KERN_WARNING "microcode: aborting, "
229 "bad extended signature table checksum\n");
230 return -EINVAL;
231 }
232 }
233
234 /* calculate the checksum */
235 orig_sum = 0;
236 i = (MC_HEADER_SIZE + data_size) / DWSIZE;
237 while (i--)
238 orig_sum += ((int *)mc)[i];
239 if (orig_sum) {
240 printk(KERN_ERR "microcode: aborting, bad checksum\n");
241 return -EINVAL;
242 }
243 if (!ext_table_size)
244 return 0;
245 /* check extended signature checksum */
246 for (i = 0; i < ext_sigcount; i++) {
247 ext_sig = (struct extended_signature *)((void *)ext_header
248 + EXT_HEADER_SIZE + EXT_SIGNATURE_SIZE * i);
249 sum = orig_sum
250 - (mc_header->sig + mc_header->pf + mc_header->cksum)
251 + (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
252 if (sum) {
253 printk(KERN_ERR "microcode: aborting, bad checksum\n");
254 return -EINVAL;
255 }
256 }
257 return 0;
258}
259
260/*
261 * return 0 - no update found
262 * return 1 - found update
263 * return < 0 - error
264 */
265static int get_maching_microcode(void *mc, int cpu)
266{
267 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
268 microcode_header_t *mc_header = mc;
269 struct extended_sigtable *ext_header;
270 unsigned long total_size = get_totalsize(mc_header);
271 int ext_sigcount, i;
272 struct extended_signature *ext_sig;
273 void *new_mc;
274
275 if (microcode_update_match(cpu, mc_header,
276 mc_header->sig, mc_header->pf))
277 goto find;
278
279 if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
280 return 0;
281
282 ext_header = (struct extended_sigtable *)(mc +
283 get_datasize(mc_header) + MC_HEADER_SIZE);
284 ext_sigcount = ext_header->count;
285 ext_sig = (struct extended_signature *)((void *)ext_header
286 + EXT_HEADER_SIZE);
287 for (i = 0; i < ext_sigcount; i++) {
288 if (microcode_update_match(cpu, mc_header,
289 ext_sig->sig, ext_sig->pf))
290 goto find;
291 ext_sig++;
292 }
293 return 0;
294find:
295 pr_debug("microcode: CPU %d found a matching microcode update with"
296 " version 0x%x (current=0x%x)\n", cpu, mc_header->rev,uci->rev);
297 new_mc = vmalloc(total_size);
298 if (!new_mc) {
299 printk(KERN_ERR "microcode: error! Can not allocate memory\n");
300 return -ENOMEM;
301 }
302
303 /* free previous update file */
304 vfree(uci->mc);
305
306 memcpy(new_mc, mc, total_size);
307 uci->mc = new_mc;
308 return 1;
309}
310
311static void apply_microcode(int cpu)
312{
313 unsigned long flags;
314 unsigned int val[2];
315 int cpu_num = raw_smp_processor_id();
316 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
317
318 /* We should bind the task to the CPU */
319 BUG_ON(cpu_num != cpu);
320
321 if (uci->mc == NULL)
322 return;
323
324 /* serialize access to the physical write to MSR 0x79 */
325 spin_lock_irqsave(&microcode_update_lock, flags);
326
327 /* write microcode via MSR 0x79 */
328 wrmsr(MSR_IA32_UCODE_WRITE,
329 (unsigned long) uci->mc->bits,
330 (unsigned long) uci->mc->bits >> 16 >> 16);
331 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
332
333 /* see notes above for revision 1.07. Apparent chip bug */
334 sync_core();
335
336 /* get the current revision from MSR 0x8B */
337 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
338
339 spin_unlock_irqrestore(&microcode_update_lock, flags);
340 if (val[1] != uci->mc->hdr.rev) {
341 printk(KERN_ERR "microcode: CPU%d updated from revision "
342 "0x%x to 0x%x failed\n", cpu_num, uci->rev, val[1]);
343 return;
344 }
345 pr_debug("microcode: CPU%d updated from revision "
346 "0x%x to 0x%x, date = %08x \n",
347 cpu_num, uci->rev, val[1], uci->mc->hdr.date);
348 uci->rev = val[1];
349}
350
351#ifdef CONFIG_MICROCODE_OLD_INTERFACE
352static void __user *user_buffer; /* user area microcode data buffer */
353static unsigned int user_buffer_size; /* it's size */
354
355static long get_next_ucode(void **mc, long offset)
356{
357 microcode_header_t mc_header;
358 unsigned long total_size;
359
360 /* No more data */
361 if (offset >= user_buffer_size)
362 return 0;
363 if (copy_from_user(&mc_header, user_buffer + offset, MC_HEADER_SIZE)) {
364 printk(KERN_ERR "microcode: error! Can not read user data\n");
365 return -EFAULT;
366 }
367 total_size = get_totalsize(&mc_header);
368 if (offset + total_size > user_buffer_size) {
369 printk(KERN_ERR "microcode: error! Bad total size in microcode "
370 "data file\n");
371 return -EINVAL;
372 }
373 *mc = vmalloc(total_size);
374 if (!*mc)
375 return -ENOMEM;
376 if (copy_from_user(*mc, user_buffer + offset, total_size)) {
377 printk(KERN_ERR "microcode: error! Can not read user data\n");
378 vfree(*mc);
379 return -EFAULT;
380 }
381 return offset + total_size;
382}
383
384static int do_microcode_update (void)
385{
386 long cursor = 0;
387 int error = 0;
388 void *new_mc = NULL;
389 int cpu;
390 cpumask_t old;
391
392 old = current->cpus_allowed;
393
394 while ((cursor = get_next_ucode(&new_mc, cursor)) > 0) {
395 error = microcode_sanity_check(new_mc);
396 if (error)
397 goto out;
398 /*
399 * It's possible the data file has multiple matching ucode,
400 * lets keep searching till the latest version
401 */
402 for_each_online_cpu(cpu) {
403 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
404
405 if (!uci->valid)
406 continue;
407 set_cpus_allowed(current, cpumask_of_cpu(cpu));
408 error = get_maching_microcode(new_mc, cpu);
409 if (error < 0)
410 goto out;
411 if (error == 1)
412 apply_microcode(cpu);
413 }
414 vfree(new_mc);
415 }
416out:
417 if (cursor > 0)
418 vfree(new_mc);
419 if (cursor < 0)
420 error = cursor;
421 set_cpus_allowed(current, old);
422 return error;
423}
424
425static int microcode_open (struct inode *unused1, struct file *unused2)
426{
427 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
428}
429
430static ssize_t microcode_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos)
431{
432 ssize_t ret;
433
434 if ((len >> PAGE_SHIFT) > num_physpages) {
435 printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages);
436 return -EINVAL;
437 }
438
439 lock_cpu_hotplug();
440 mutex_lock(&microcode_mutex);
441
442 user_buffer = (void __user *) buf;
443 user_buffer_size = (int) len;
444
445 ret = do_microcode_update();
446 if (!ret)
447 ret = (ssize_t)len;
448
449 mutex_unlock(&microcode_mutex);
450 unlock_cpu_hotplug();
451
452 return ret;
453}
454
455static const struct file_operations microcode_fops = {
456 .owner = THIS_MODULE,
457 .write = microcode_write,
458 .open = microcode_open,
459};
460
461static struct miscdevice microcode_dev = {
462 .minor = MICROCODE_MINOR,
463 .name = "microcode",
464 .fops = &microcode_fops,
465};
466
467static int __init microcode_dev_init (void)
468{
469 int error;
470
471 error = misc_register(&microcode_dev);
472 if (error) {
473 printk(KERN_ERR
474 "microcode: can't misc_register on minor=%d\n",
475 MICROCODE_MINOR);
476 return error;
477 }
478
479 return 0;
480}
481
482static void microcode_dev_exit (void)
483{
484 misc_deregister(&microcode_dev);
485}
486
487MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
488#else
489#define microcode_dev_init() 0
490#define microcode_dev_exit() do { } while(0)
491#endif
492
493static long get_next_ucode_from_buffer(void **mc, void *buf,
494 unsigned long size, long offset)
495{
496 microcode_header_t *mc_header;
497 unsigned long total_size;
498
499 /* No more data */
500 if (offset >= size)
501 return 0;
502 mc_header = (microcode_header_t *)(buf + offset);
503 total_size = get_totalsize(mc_header);
504
505 if (offset + total_size > size) {
506 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
507 return -EINVAL;
508 }
509
510 *mc = vmalloc(total_size);
511 if (!*mc) {
512 printk(KERN_ERR "microcode: error! Can not allocate memory\n");
513 return -ENOMEM;
514 }
515 memcpy(*mc, buf + offset, total_size);
516 return offset + total_size;
517}
518
519/* fake device for request_firmware */
520static struct platform_device *microcode_pdev;
521
522static int cpu_request_microcode(int cpu)
523{
524 char name[30];
525 struct cpuinfo_x86 *c = cpu_data + cpu;
526 const struct firmware *firmware;
527 void *buf;
528 unsigned long size;
529 long offset = 0;
530 int error;
531 void *mc;
532
533 /* We should bind the task to the CPU */
534 BUG_ON(cpu != raw_smp_processor_id());
535 sprintf(name,"intel-ucode/%02x-%02x-%02x",
536 c->x86, c->x86_model, c->x86_mask);
537 error = request_firmware(&firmware, name, &microcode_pdev->dev);
538 if (error) {
539 pr_debug("ucode data file %s load failed\n", name);
540 return error;
541 }
542 buf = (void *)firmware->data;
543 size = firmware->size;
544 while ((offset = get_next_ucode_from_buffer(&mc, buf, size, offset))
545 > 0) {
546 error = microcode_sanity_check(mc);
547 if (error)
548 break;
549 error = get_maching_microcode(mc, cpu);
550 if (error < 0)
551 break;
552 /*
553 * It's possible the data file has multiple matching ucode,
554 * lets keep searching till the latest version
555 */
556 if (error == 1) {
557 apply_microcode(cpu);
558 error = 0;
559 }
560 vfree(mc);
561 }
562 if (offset > 0)
563 vfree(mc);
564 if (offset < 0)
565 error = offset;
566 release_firmware(firmware);
567
568 return error;
569}
570
571static int apply_microcode_check_cpu(int cpu)
572{
573 struct cpuinfo_x86 *c = cpu_data + cpu;
574 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
575 cpumask_t old;
576 unsigned int val[2];
577 int err = 0;
578
579 /* Check if the microcode is available */
580 if (!uci->mc)
581 return 0;
582
583 old = current->cpus_allowed;
584 set_cpus_allowed(current, cpumask_of_cpu(cpu));
585
586 /* Check if the microcode we have in memory matches the CPU */
587 if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
588 cpu_has(c, X86_FEATURE_IA64) || uci->sig != cpuid_eax(0x00000001))
589 err = -EINVAL;
590
591 if (!err && ((c->x86_model >= 5) || (c->x86 > 6))) {
592 /* get processor flags from MSR 0x17 */
593 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
594 if (uci->pf != (1 << ((val[1] >> 18) & 7)))
595 err = -EINVAL;
596 }
597
598 if (!err) {
599 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
600 /* see notes above for revision 1.07. Apparent chip bug */
601 sync_core();
602 /* get the current revision from MSR 0x8B */
603 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
604 if (uci->rev != val[1])
605 err = -EINVAL;
606 }
607
608 if (!err)
609 apply_microcode(cpu);
610 else
611 printk(KERN_ERR "microcode: Could not apply microcode to CPU%d:"
612 " sig=0x%x, pf=0x%x, rev=0x%x\n",
613 cpu, uci->sig, uci->pf, uci->rev);
614
615 set_cpus_allowed(current, old);
616 return err;
617}
618
619static void microcode_init_cpu(int cpu, int resume)
620{
621 cpumask_t old;
622 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
623
624 old = current->cpus_allowed;
625
626 set_cpus_allowed(current, cpumask_of_cpu(cpu));
627 mutex_lock(&microcode_mutex);
628 collect_cpu_info(cpu);
629 if (uci->valid && system_state == SYSTEM_RUNNING && !resume)
630 cpu_request_microcode(cpu);
631 mutex_unlock(&microcode_mutex);
632 set_cpus_allowed(current, old);
633}
634
635static void microcode_fini_cpu(int cpu)
636{
637 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
638
639 mutex_lock(&microcode_mutex);
640 uci->valid = 0;
641 vfree(uci->mc);
642 uci->mc = NULL;
643 mutex_unlock(&microcode_mutex);
644}
645
646static ssize_t reload_store(struct sys_device *dev, const char *buf, size_t sz)
647{
648 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
649 char *end;
650 unsigned long val = simple_strtoul(buf, &end, 0);
651 int err = 0;
652 int cpu = dev->id;
653
654 if (end == buf)
655 return -EINVAL;
656 if (val == 1) {
657 cpumask_t old;
658
659 old = current->cpus_allowed;
660
661 lock_cpu_hotplug();
662 set_cpus_allowed(current, cpumask_of_cpu(cpu));
663
664 mutex_lock(&microcode_mutex);
665 if (uci->valid)
666 err = cpu_request_microcode(cpu);
667 mutex_unlock(&microcode_mutex);
668 unlock_cpu_hotplug();
669 set_cpus_allowed(current, old);
670 }
671 if (err)
672 return err;
673 return sz;
674}
675
676static ssize_t version_show(struct sys_device *dev, char *buf)
677{
678 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
679
680 return sprintf(buf, "0x%x\n", uci->rev);
681}
682
683static ssize_t pf_show(struct sys_device *dev, char *buf)
684{
685 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
686
687 return sprintf(buf, "0x%x\n", uci->pf);
688}
689
690static SYSDEV_ATTR(reload, 0200, NULL, reload_store);
691static SYSDEV_ATTR(version, 0400, version_show, NULL);
692static SYSDEV_ATTR(processor_flags, 0400, pf_show, NULL);
693
694static struct attribute *mc_default_attrs[] = {
695 &attr_reload.attr,
696 &attr_version.attr,
697 &attr_processor_flags.attr,
698 NULL
699};
700
701static struct attribute_group mc_attr_group = {
702 .attrs = mc_default_attrs,
703 .name = "microcode",
704};
705
706static int __mc_sysdev_add(struct sys_device *sys_dev, int resume)
707{
708 int err, cpu = sys_dev->id;
709 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
710
711 if (!cpu_online(cpu))
712 return 0;
713
714 pr_debug("Microcode:CPU %d added\n", cpu);
715 memset(uci, 0, sizeof(*uci));
716
717 err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
718 if (err)
719 return err;
720
721 microcode_init_cpu(cpu, resume);
722
723 return 0;
724}
725
726static int mc_sysdev_add(struct sys_device *sys_dev)
727{
728 return __mc_sysdev_add(sys_dev, 0);
729}
730
731static int mc_sysdev_remove(struct sys_device *sys_dev)
732{
733 int cpu = sys_dev->id;
734
735 if (!cpu_online(cpu))
736 return 0;
737
738 pr_debug("Microcode:CPU %d removed\n", cpu);
739 microcode_fini_cpu(cpu);
740 sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
741 return 0;
742}
743
744static int mc_sysdev_resume(struct sys_device *dev)
745{
746 int cpu = dev->id;
747
748 if (!cpu_online(cpu))
749 return 0;
750 pr_debug("Microcode:CPU %d resumed\n", cpu);
751 /* only CPU 0 will apply ucode here */
752 apply_microcode(0);
753 return 0;
754}
755
756static struct sysdev_driver mc_sysdev_driver = {
757 .add = mc_sysdev_add,
758 .remove = mc_sysdev_remove,
759 .resume = mc_sysdev_resume,
760};
761
762static __cpuinit int
763mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
764{
765 unsigned int cpu = (unsigned long)hcpu;
766 struct sys_device *sys_dev;
767
768 sys_dev = get_cpu_sysdev(cpu);
769 switch (action) {
770 case CPU_UP_CANCELED_FROZEN:
771 /* The CPU refused to come up during a system resume */
772 microcode_fini_cpu(cpu);
773 break;
774 case CPU_ONLINE:
775 case CPU_DOWN_FAILED:
776 mc_sysdev_add(sys_dev);
777 break;
778 case CPU_ONLINE_FROZEN:
779 /* System-wide resume is in progress, try to apply microcode */
780 if (apply_microcode_check_cpu(cpu)) {
781 /* The application of microcode failed */
782 microcode_fini_cpu(cpu);
783 __mc_sysdev_add(sys_dev, 1);
784 break;
785 }
786 case CPU_DOWN_FAILED_FROZEN:
787 if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group))
788 printk(KERN_ERR "Microcode: Failed to create the sysfs "
789 "group for CPU%d\n", cpu);
790 break;
791 case CPU_DOWN_PREPARE:
792 mc_sysdev_remove(sys_dev);
793 break;
794 case CPU_DOWN_PREPARE_FROZEN:
795 /* Suspend is in progress, only remove the interface */
796 sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
797 break;
798 }
799 return NOTIFY_OK;
800}
801
802static struct notifier_block __cpuinitdata mc_cpu_notifier = {
803 .notifier_call = mc_cpu_callback,
804};
805
806static int __init microcode_init (void)
807{
808 int error;
809
810 error = microcode_dev_init();
811 if (error)
812 return error;
813 microcode_pdev = platform_device_register_simple("microcode", -1,
814 NULL, 0);
815 if (IS_ERR(microcode_pdev)) {
816 microcode_dev_exit();
817 return PTR_ERR(microcode_pdev);
818 }
819
820 lock_cpu_hotplug();
821 error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);
822 unlock_cpu_hotplug();
823 if (error) {
824 microcode_dev_exit();
825 platform_device_unregister(microcode_pdev);
826 return error;
827 }
828
829 register_hotcpu_notifier(&mc_cpu_notifier);
830
831 printk(KERN_INFO
832 "IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@aivazian.fsnet.co.uk>\n");
833 return 0;
834}
835
836static void __exit microcode_exit (void)
837{
838 microcode_dev_exit();
839
840 unregister_hotcpu_notifier(&mc_cpu_notifier);
841
842 lock_cpu_hotplug();
843 sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
844 unlock_cpu_hotplug();
845
846 platform_device_unregister(microcode_pdev);
847}
848
849module_init(microcode_init)
850module_exit(microcode_exit)
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 07:22:27 -0500