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authorPeter Oruba <peter.oruba@amd.com>2008-07-28 12:44:16 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-28 13:57:54 -0400
commit1abae31096007cc993f67ae2576fe8f812270ad6 (patch)
treebf17df306aee0a016378bb5f2b06638488319442 /arch/x86/kernel/microcode.c
parentc3b71bcec0380836caac9b524fa1585b469b7456 (diff)
x86: move microcode.c to microcode_intel.c
Signed-off-by: Peter Oruba <peter.oruba@amd.com> Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/microcode.c')
-rw-r--r--arch/x86/kernel/microcode.c855
1 files changed, 0 insertions, 855 deletions
diff --git a/arch/x86/kernel/microcode.c b/arch/x86/kernel/microcode.c
deleted file mode 100644
index 4e7b2f65fed6..000000000000
--- a/arch/x86/kernel/microcode.c
+++ /dev/null
@@ -1,855 +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 8.11 of Volume 3a, IA-32 Intel? Architecture
12 * Software Developer's Manual
13 * Order Number 253668 or free download from:
14 *
15 * http://developer.intel.com/design/pentium4/manuals/253668.htm
16 *
17 * For more information, go to http://www.urbanmyth.org/microcode
18 *
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License
21 * as published by the Free Software Foundation; either version
22 * 2 of the License, or (at your option) any later version.
23 *
24 * 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com>
25 * Initial release.
26 * 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com>
27 * Added read() support + cleanups.
28 * 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com>
29 * Added 'device trimming' support. open(O_WRONLY) zeroes
30 * and frees the saved copy of applied microcode.
31 * 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com>
32 * Made to use devfs (/dev/cpu/microcode) + cleanups.
33 * 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com>
34 * Added misc device support (now uses both devfs and misc).
35 * Added MICROCODE_IOCFREE ioctl to clear memory.
36 * 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com>
37 * Messages for error cases (non Intel & no suitable microcode).
38 * 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com>
39 * Removed ->release(). Removed exclusive open and status bitmap.
40 * Added microcode_rwsem to serialize read()/write()/ioctl().
41 * Removed global kernel lock usage.
42 * 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com>
43 * Write 0 to 0x8B msr and then cpuid before reading revision,
44 * so that it works even if there were no update done by the
45 * BIOS. Otherwise, reading from 0x8B gives junk (which happened
46 * to be 0 on my machine which is why it worked even when I
47 * disabled update by the BIOS)
48 * Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix.
49 * 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and
50 * Tigran Aivazian <tigran@veritas.com>
51 * Intel Pentium 4 processor support and bugfixes.
52 * 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com>
53 * Bugfix for HT (Hyper-Threading) enabled processors
54 * whereby processor resources are shared by all logical processors
55 * in a single CPU package.
56 * 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and
57 * Tigran Aivazian <tigran@veritas.com>,
58 * Serialize updates as required on HT processors due to speculative
59 * nature of implementation.
60 * 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
61 * Fix the panic when writing zero-length microcode chunk.
62 * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
63 * Jun Nakajima <jun.nakajima@intel.com>
64 * Support for the microcode updates in the new format.
65 * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
66 * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
67 * because we no longer hold a copy of applied microcode
68 * in kernel memory.
69 * 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com>
70 * Fix sigmatch() macro to handle old CPUs with pf == 0.
71 * Thanks to Stuart Swales for pointing out this bug.
72 */
73
74//#define DEBUG /* pr_debug */
75#include <linux/capability.h>
76#include <linux/kernel.h>
77#include <linux/init.h>
78#include <linux/sched.h>
79#include <linux/smp_lock.h>
80#include <linux/cpumask.h>
81#include <linux/module.h>
82#include <linux/slab.h>
83#include <linux/vmalloc.h>
84#include <linux/miscdevice.h>
85#include <linux/spinlock.h>
86#include <linux/mm.h>
87#include <linux/fs.h>
88#include <linux/mutex.h>
89#include <linux/cpu.h>
90#include <linux/firmware.h>
91#include <linux/platform_device.h>
92
93#include <asm/msr.h>
94#include <asm/uaccess.h>
95#include <asm/processor.h>
96#include <asm/microcode.h>
97
98MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
99MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
100MODULE_LICENSE("GPL");
101
102#define MICROCODE_VERSION "1.14a"
103
104#define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
105#define MC_HEADER_SIZE (sizeof (struct microcode_header)) /* 48 bytes */
106#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
107#define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */
108#define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */
109#define DWSIZE (sizeof (u32))
110#define get_totalsize(mc) \
111 (((struct microcode *)mc)->hdr.totalsize ? \
112 ((struct microcode *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
113#define get_datasize(mc) \
114 (((struct microcode *)mc)->hdr.datasize ? \
115 ((struct microcode *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
116
117#define sigmatch(s1, s2, p1, p2) \
118 (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
119
120#define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
121
122/* serialize access to the physical write to MSR 0x79 */
123static DEFINE_SPINLOCK(microcode_update_lock);
124
125/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
126static DEFINE_MUTEX(microcode_mutex);
127
128static struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
129
130static void collect_cpu_info(int cpu_num)
131{
132 struct cpuinfo_x86 *c = &cpu_data(cpu_num);
133 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
134 unsigned int val[2];
135
136 /* We should bind the task to the CPU */
137 BUG_ON(raw_smp_processor_id() != cpu_num);
138 uci->pf = uci->rev = 0;
139 uci->mc = NULL;
140 uci->valid = 1;
141
142 if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
143 cpu_has(c, X86_FEATURE_IA64)) {
144 printk(KERN_ERR "microcode: CPU%d not a capable Intel "
145 "processor\n", cpu_num);
146 uci->valid = 0;
147 return;
148 }
149
150 uci->sig = cpuid_eax(0x00000001);
151
152 if ((c->x86_model >= 5) || (c->x86 > 6)) {
153 /* get processor flags from MSR 0x17 */
154 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
155 uci->pf = 1 << ((val[1] >> 18) & 7);
156 }
157
158 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
159 /* see notes above for revision 1.07. Apparent chip bug */
160 sync_core();
161 /* get the current revision from MSR 0x8B */
162 rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
163 pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
164 uci->sig, uci->pf, uci->rev);
165}
166
167static inline int microcode_update_match(int cpu_num,
168 struct microcode_header *mc_header, int sig, int pf)
169{
170 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
171
172 if (!sigmatch(sig, uci->sig, pf, uci->pf)
173 || mc_header->rev <= uci->rev)
174 return 0;
175 return 1;
176}
177
178static int microcode_sanity_check(void *mc)
179{
180 struct microcode_header *mc_header = mc;
181 struct extended_sigtable *ext_header = NULL;
182 struct extended_signature *ext_sig;
183 unsigned long total_size, data_size, ext_table_size;
184 int sum, orig_sum, ext_sigcount = 0, i;
185
186 total_size = get_totalsize(mc_header);
187 data_size = get_datasize(mc_header);
188 if (data_size + MC_HEADER_SIZE > total_size) {
189 printk(KERN_ERR "microcode: error! "
190 "Bad data size in microcode data file\n");
191 return -EINVAL;
192 }
193
194 if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
195 printk(KERN_ERR "microcode: error! "
196 "Unknown microcode update format\n");
197 return -EINVAL;
198 }
199 ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
200 if (ext_table_size) {
201 if ((ext_table_size < EXT_HEADER_SIZE)
202 || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
203 printk(KERN_ERR "microcode: error! "
204 "Small exttable size in microcode data file\n");
205 return -EINVAL;
206 }
207 ext_header = mc + MC_HEADER_SIZE + data_size;
208 if (ext_table_size != exttable_size(ext_header)) {
209 printk(KERN_ERR "microcode: error! "
210 "Bad exttable size in microcode data file\n");
211 return -EFAULT;
212 }
213 ext_sigcount = ext_header->count;
214 }
215
216 /* check extended table checksum */
217 if (ext_table_size) {
218 int ext_table_sum = 0;
219 int *ext_tablep = (int *)ext_header;
220
221 i = ext_table_size / DWSIZE;
222 while (i--)
223 ext_table_sum += ext_tablep[i];
224 if (ext_table_sum) {
225 printk(KERN_WARNING "microcode: aborting, "
226 "bad extended signature table checksum\n");
227 return -EINVAL;
228 }
229 }
230
231 /* calculate the checksum */
232 orig_sum = 0;
233 i = (MC_HEADER_SIZE + data_size) / DWSIZE;
234 while (i--)
235 orig_sum += ((int *)mc)[i];
236 if (orig_sum) {
237 printk(KERN_ERR "microcode: aborting, bad checksum\n");
238 return -EINVAL;
239 }
240 if (!ext_table_size)
241 return 0;
242 /* check extended signature checksum */
243 for (i = 0; i < ext_sigcount; i++) {
244 ext_sig = (void *)ext_header + EXT_HEADER_SIZE +
245 EXT_SIGNATURE_SIZE * i;
246 sum = orig_sum
247 - (mc_header->sig + mc_header->pf + mc_header->cksum)
248 + (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
249 if (sum) {
250 printk(KERN_ERR "microcode: aborting, bad checksum\n");
251 return -EINVAL;
252 }
253 }
254 return 0;
255}
256
257/*
258 * return 0 - no update found
259 * return 1 - found update
260 * return < 0 - error
261 */
262static int get_maching_microcode(void *mc, int cpu)
263{
264 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
265 struct microcode_header *mc_header = mc;
266 struct extended_sigtable *ext_header;
267 unsigned long total_size = get_totalsize(mc_header);
268 int ext_sigcount, i;
269 struct extended_signature *ext_sig;
270 void *new_mc;
271
272 if (microcode_update_match(cpu, mc_header,
273 mc_header->sig, mc_header->pf))
274 goto find;
275
276 if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
277 return 0;
278
279 ext_header = mc + get_datasize(mc_header) + MC_HEADER_SIZE;
280 ext_sigcount = ext_header->count;
281 ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
282 for (i = 0; i < ext_sigcount; i++) {
283 if (microcode_update_match(cpu, mc_header,
284 ext_sig->sig, ext_sig->pf))
285 goto find;
286 ext_sig++;
287 }
288 return 0;
289find:
290 pr_debug("microcode: CPU%d found a matching microcode update with"
291 " version 0x%x (current=0x%x)\n", cpu, mc_header->rev,uci->rev);
292 new_mc = vmalloc(total_size);
293 if (!new_mc) {
294 printk(KERN_ERR "microcode: error! Can not allocate memory\n");
295 return -ENOMEM;
296 }
297
298 /* free previous update file */
299 vfree(uci->mc);
300
301 memcpy(new_mc, mc, total_size);
302 uci->mc = new_mc;
303 return 1;
304}
305
306static void apply_microcode(int cpu)
307{
308 unsigned long flags;
309 unsigned int val[2];
310 int cpu_num = raw_smp_processor_id();
311 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
312
313 /* We should bind the task to the CPU */
314 BUG_ON(cpu_num != cpu);
315
316 if (uci->mc == NULL)
317 return;
318
319 /* serialize access to the physical write to MSR 0x79 */
320 spin_lock_irqsave(&microcode_update_lock, flags);
321
322 /* write microcode via MSR 0x79 */
323 wrmsr(MSR_IA32_UCODE_WRITE,
324 (unsigned long) uci->mc->bits,
325 (unsigned long) uci->mc->bits >> 16 >> 16);
326 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
327
328 /* see notes above for revision 1.07. Apparent chip bug */
329 sync_core();
330
331 /* get the current revision from MSR 0x8B */
332 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
333
334 spin_unlock_irqrestore(&microcode_update_lock, flags);
335 if (val[1] != uci->mc->hdr.rev) {
336 printk(KERN_ERR "microcode: CPU%d update from revision "
337 "0x%x to 0x%x failed\n", cpu_num, uci->rev, val[1]);
338 return;
339 }
340 printk(KERN_INFO "microcode: CPU%d updated from revision "
341 "0x%x to 0x%x, date = %08x \n",
342 cpu_num, uci->rev, val[1], uci->mc->hdr.date);
343 uci->rev = val[1];
344}
345
346#ifdef CONFIG_MICROCODE_OLD_INTERFACE
347static void __user *user_buffer; /* user area microcode data buffer */
348static unsigned int user_buffer_size; /* it's size */
349
350static long get_next_ucode(void **mc, long offset)
351{
352 struct microcode_header mc_header;
353 unsigned long total_size;
354
355 /* No more data */
356 if (offset >= user_buffer_size)
357 return 0;
358 if (copy_from_user(&mc_header, user_buffer + offset, MC_HEADER_SIZE)) {
359 printk(KERN_ERR "microcode: error! Can not read user data\n");
360 return -EFAULT;
361 }
362 total_size = get_totalsize(&mc_header);
363 if (offset + total_size > user_buffer_size) {
364 printk(KERN_ERR "microcode: error! Bad total size in microcode "
365 "data file\n");
366 return -EINVAL;
367 }
368 *mc = vmalloc(total_size);
369 if (!*mc)
370 return -ENOMEM;
371 if (copy_from_user(*mc, user_buffer + offset, total_size)) {
372 printk(KERN_ERR "microcode: error! Can not read user data\n");
373 vfree(*mc);
374 return -EFAULT;
375 }
376 return offset + total_size;
377}
378
379static int do_microcode_update (void)
380{
381 long cursor = 0;
382 int error = 0;
383 void *new_mc = NULL;
384 int cpu;
385 cpumask_t old;
386 cpumask_of_cpu_ptr_declare(newmask);
387
388 old = current->cpus_allowed;
389
390 while ((cursor = get_next_ucode(&new_mc, cursor)) > 0) {
391 error = microcode_sanity_check(new_mc);
392 if (error)
393 goto out;
394 /*
395 * It's possible the data file has multiple matching ucode,
396 * lets keep searching till the latest version
397 */
398 for_each_online_cpu(cpu) {
399 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
400
401 if (!uci->valid)
402 continue;
403 cpumask_of_cpu_ptr_next(newmask, cpu);
404 set_cpus_allowed_ptr(current, newmask);
405 error = get_maching_microcode(new_mc, cpu);
406 if (error < 0)
407 goto out;
408 if (error == 1)
409 apply_microcode(cpu);
410 }
411 vfree(new_mc);
412 }
413out:
414 if (cursor > 0)
415 vfree(new_mc);
416 if (cursor < 0)
417 error = cursor;
418 set_cpus_allowed_ptr(current, &old);
419 return error;
420}
421
422static int microcode_open (struct inode *unused1, struct file *unused2)
423{
424 cycle_kernel_lock();
425 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
426}
427
428static ssize_t microcode_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos)
429{
430 ssize_t ret;
431
432 if ((len >> PAGE_SHIFT) > num_physpages) {
433 printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages);
434 return -EINVAL;
435 }
436
437 get_online_cpus();
438 mutex_lock(&microcode_mutex);
439
440 user_buffer = (void __user *) buf;
441 user_buffer_size = (int) len;
442
443 ret = do_microcode_update();
444 if (!ret)
445 ret = (ssize_t)len;
446
447 mutex_unlock(&microcode_mutex);
448 put_online_cpus();
449
450 return ret;
451}
452
453static const struct file_operations microcode_fops = {
454 .owner = THIS_MODULE,
455 .write = microcode_write,
456 .open = microcode_open,
457};
458
459static struct miscdevice microcode_dev = {
460 .minor = MICROCODE_MINOR,
461 .name = "microcode",
462 .fops = &microcode_fops,
463};
464
465static int __init microcode_dev_init (void)
466{
467 int error;
468
469 error = misc_register(&microcode_dev);
470 if (error) {
471 printk(KERN_ERR
472 "microcode: can't misc_register on minor=%d\n",
473 MICROCODE_MINOR);
474 return error;
475 }
476
477 return 0;
478}
479
480static void microcode_dev_exit (void)
481{
482 misc_deregister(&microcode_dev);
483}
484
485MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
486#else
487#define microcode_dev_init() 0
488#define microcode_dev_exit() do { } while(0)
489#endif
490
491static long get_next_ucode_from_buffer(void **mc, const u8 *buf,
492 unsigned long size, long offset)
493{
494 struct microcode_header *mc_header;
495 unsigned long total_size;
496
497 /* No more data */
498 if (offset >= size)
499 return 0;
500 mc_header = (struct microcode_header *)(buf + offset);
501 total_size = get_totalsize(mc_header);
502
503 if (offset + total_size > size) {
504 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
505 return -EINVAL;
506 }
507
508 *mc = vmalloc(total_size);
509 if (!*mc) {
510 printk(KERN_ERR "microcode: error! Can not allocate memory\n");
511 return -ENOMEM;
512 }
513 memcpy(*mc, buf + offset, total_size);
514 return offset + total_size;
515}
516
517/* fake device for request_firmware */
518static struct platform_device *microcode_pdev;
519
520static int cpu_request_microcode(int cpu)
521{
522 char name[30];
523 struct cpuinfo_x86 *c = &cpu_data(cpu);
524 const struct firmware *firmware;
525 const u8 *buf;
526 unsigned long size;
527 long offset = 0;
528 int error;
529 void *mc;
530
531 /* We should bind the task to the CPU */
532 BUG_ON(cpu != raw_smp_processor_id());
533 sprintf(name,"intel-ucode/%02x-%02x-%02x",
534 c->x86, c->x86_model, c->x86_mask);
535 error = request_firmware(&firmware, name, &microcode_pdev->dev);
536 if (error) {
537 pr_debug("microcode: data file %s load failed\n", name);
538 return error;
539 }
540 buf = firmware->data;
541 size = firmware->size;
542 while ((offset = get_next_ucode_from_buffer(&mc, buf, size, offset))
543 > 0) {
544 error = microcode_sanity_check(mc);
545 if (error)
546 break;
547 error = get_maching_microcode(mc, cpu);
548 if (error < 0)
549 break;
550 /*
551 * It's possible the data file has multiple matching ucode,
552 * lets keep searching till the latest version
553 */
554 if (error == 1) {
555 apply_microcode(cpu);
556 error = 0;
557 }
558 vfree(mc);
559 }
560 if (offset > 0)
561 vfree(mc);
562 if (offset < 0)
563 error = offset;
564 release_firmware(firmware);
565
566 return error;
567}
568
569static int apply_microcode_check_cpu(int cpu)
570{
571 struct cpuinfo_x86 *c = &cpu_data(cpu);
572 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
573 cpumask_t old;
574 cpumask_of_cpu_ptr(newmask, cpu);
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_ptr(current, newmask);
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_ptr(current, &old);
615 return err;
616}
617
618static void microcode_init_cpu(int cpu, int resume)
619{
620 cpumask_t old;
621 cpumask_of_cpu_ptr(newmask, cpu);
622 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
623
624 old = current->cpus_allowed;
625
626 set_cpus_allowed_ptr(current, newmask);
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_ptr(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,
647 struct sysdev_attribute *attr,
648 const char *buf, size_t sz)
649{
650 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
651 char *end;
652 unsigned long val = simple_strtoul(buf, &end, 0);
653 int err = 0;
654 int cpu = dev->id;
655
656 if (end == buf)
657 return -EINVAL;
658 if (val == 1) {
659 cpumask_t old;
660 cpumask_of_cpu_ptr(newmask, cpu);
661
662 old = current->cpus_allowed;
663
664 get_online_cpus();
665 set_cpus_allowed_ptr(current, newmask);
666
667 mutex_lock(&microcode_mutex);
668 if (uci->valid)
669 err = cpu_request_microcode(cpu);
670 mutex_unlock(&microcode_mutex);
671 put_online_cpus();
672 set_cpus_allowed_ptr(current, &old);
673 }
674 if (err)
675 return err;
676 return sz;
677}
678
679static ssize_t version_show(struct sys_device *dev,
680 struct sysdev_attribute *attr, char *buf)
681{
682 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
683
684 return sprintf(buf, "0x%x\n", uci->rev);
685}
686
687static ssize_t pf_show(struct sys_device *dev,
688 struct sysdev_attribute *attr, char *buf)
689{
690 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
691
692 return sprintf(buf, "0x%x\n", uci->pf);
693}
694
695static SYSDEV_ATTR(reload, 0200, NULL, reload_store);
696static SYSDEV_ATTR(version, 0400, version_show, NULL);
697static SYSDEV_ATTR(processor_flags, 0400, pf_show, NULL);
698
699static struct attribute *mc_default_attrs[] = {
700 &attr_reload.attr,
701 &attr_version.attr,
702 &attr_processor_flags.attr,
703 NULL
704};
705
706static struct attribute_group mc_attr_group = {
707 .attrs = mc_default_attrs,
708 .name = "microcode",
709};
710
711static int __mc_sysdev_add(struct sys_device *sys_dev, int resume)
712{
713 int err, cpu = sys_dev->id;
714 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
715
716 if (!cpu_online(cpu))
717 return 0;
718
719 pr_debug("microcode: CPU%d added\n", cpu);
720 memset(uci, 0, sizeof(*uci));
721
722 err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
723 if (err)
724 return err;
725
726 microcode_init_cpu(cpu, resume);
727
728 return 0;
729}
730
731static int mc_sysdev_add(struct sys_device *sys_dev)
732{
733 return __mc_sysdev_add(sys_dev, 0);
734}
735
736static int mc_sysdev_remove(struct sys_device *sys_dev)
737{
738 int cpu = sys_dev->id;
739
740 if (!cpu_online(cpu))
741 return 0;
742
743 pr_debug("microcode: CPU%d removed\n", cpu);
744 microcode_fini_cpu(cpu);
745 sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
746 return 0;
747}
748
749static int mc_sysdev_resume(struct sys_device *dev)
750{
751 int cpu = dev->id;
752
753 if (!cpu_online(cpu))
754 return 0;
755 pr_debug("microcode: CPU%d resumed\n", cpu);
756 /* only CPU 0 will apply ucode here */
757 apply_microcode(0);
758 return 0;
759}
760
761static struct sysdev_driver mc_sysdev_driver = {
762 .add = mc_sysdev_add,
763 .remove = mc_sysdev_remove,
764 .resume = mc_sysdev_resume,
765};
766
767static __cpuinit int
768mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
769{
770 unsigned int cpu = (unsigned long)hcpu;
771 struct sys_device *sys_dev;
772
773 sys_dev = get_cpu_sysdev(cpu);
774 switch (action) {
775 case CPU_UP_CANCELED_FROZEN:
776 /* The CPU refused to come up during a system resume */
777 microcode_fini_cpu(cpu);
778 break;
779 case CPU_ONLINE:
780 case CPU_DOWN_FAILED:
781 mc_sysdev_add(sys_dev);
782 break;
783 case CPU_ONLINE_FROZEN:
784 /* System-wide resume is in progress, try to apply microcode */
785 if (apply_microcode_check_cpu(cpu)) {
786 /* The application of microcode failed */
787 microcode_fini_cpu(cpu);
788 __mc_sysdev_add(sys_dev, 1);
789 break;
790 }
791 case CPU_DOWN_FAILED_FROZEN:
792 if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group))
793 printk(KERN_ERR "microcode: Failed to create the sysfs "
794 "group for CPU%d\n", cpu);
795 break;
796 case CPU_DOWN_PREPARE:
797 mc_sysdev_remove(sys_dev);
798 break;
799 case CPU_DOWN_PREPARE_FROZEN:
800 /* Suspend is in progress, only remove the interface */
801 sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
802 break;
803 }
804 return NOTIFY_OK;
805}
806
807static struct notifier_block __refdata mc_cpu_notifier = {
808 .notifier_call = mc_cpu_callback,
809};
810
811static int __init microcode_init (void)
812{
813 int error;
814
815 printk(KERN_INFO
816 "IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@aivazian.fsnet.co.uk>\n");
817
818 error = microcode_dev_init();
819 if (error)
820 return error;
821 microcode_pdev = platform_device_register_simple("microcode", -1,
822 NULL, 0);
823 if (IS_ERR(microcode_pdev)) {
824 microcode_dev_exit();
825 return PTR_ERR(microcode_pdev);
826 }
827
828 get_online_cpus();
829 error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);
830 put_online_cpus();
831 if (error) {
832 microcode_dev_exit();
833 platform_device_unregister(microcode_pdev);
834 return error;
835 }
836
837 register_hotcpu_notifier(&mc_cpu_notifier);
838 return 0;
839}
840
841static void __exit microcode_exit (void)
842{
843 microcode_dev_exit();
844
845 unregister_hotcpu_notifier(&mc_cpu_notifier);
846
847 get_online_cpus();
848 sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
849 put_online_cpus();
850
851 platform_device_unregister(microcode_pdev);
852}
853
854module_init(microcode_init)
855module_exit(microcode_exit)
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-19 11:18:37 -0500