aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/microcode.c
diff options
context:
space:
mode:
authorDmitry Adamushko <dmitry.adamushko@gmail.com>2008-09-23 06:08:44 -0400
committerIngo Molnar <mingo@elte.hu>2008-09-23 06:21:42 -0400
commit18dbc9160507dc7df998e00cd1dcd7889557307b (patch)
tree81262b57db5de63267762083a54a37558d8555f0 /arch/x86/kernel/microcode.c
parenta1c75cc5018f17ff6d80ce45a13435b1536f76db (diff)
x86: moved microcode.c to microcode_intel.c
Combine both generic and arch-specific parts of microcode into a single module (arch-specific parts are config-dependent). Also while we are at it, move arch-specific parts from microcode.h into their respective arch-specific .c files. Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Cc: "Peter Oruba" <peter.oruba@amd.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/microcode.c')
-rw-r--r--arch/x86/kernel/microcode.c505
1 files changed, 0 insertions, 505 deletions
diff --git a/arch/x86/kernel/microcode.c b/arch/x86/kernel/microcode.c
deleted file mode 100644
index 0c2634f4fd7c..000000000000
--- a/arch/x86/kernel/microcode.c
+++ /dev/null
@@ -1,505 +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
59 * speculative 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#include <linux/capability.h>
74#include <linux/kernel.h>
75#include <linux/init.h>
76#include <linux/sched.h>
77#include <linux/smp_lock.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#include <asm/microcode.h>
95
96MODULE_DESCRIPTION("Microcode Update Driver");
97MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
98MODULE_LICENSE("GPL");
99
100#define MICROCODE_VERSION "2.00"
101
102struct microcode_ops *microcode_ops;
103
104/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
105static DEFINE_MUTEX(microcode_mutex);
106
107struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
108EXPORT_SYMBOL_GPL(ucode_cpu_info);
109
110#ifdef CONFIG_MICROCODE_OLD_INTERFACE
111static int do_microcode_update(const void __user *buf, size_t size)
112{
113 cpumask_t old;
114 int error = 0;
115 int cpu;
116
117 old = current->cpus_allowed;
118
119 for_each_online_cpu(cpu) {
120 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
121
122 if (!uci->valid)
123 continue;
124
125 set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
126 error = microcode_ops->request_microcode_user(cpu, buf, size);
127 if (error < 0)
128 goto out;
129 if (!error)
130 microcode_ops->apply_microcode(cpu);
131 }
132out:
133 set_cpus_allowed_ptr(current, &old);
134 return error;
135}
136
137static int microcode_open(struct inode *unused1, struct file *unused2)
138{
139 cycle_kernel_lock();
140 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
141}
142
143static ssize_t microcode_write(struct file *file, const char __user *buf,
144 size_t len, loff_t *ppos)
145{
146 ssize_t ret;
147
148 if ((len >> PAGE_SHIFT) > num_physpages) {
149 printk(KERN_ERR "microcode: too much data (max %ld pages)\n",
150 num_physpages);
151 return -EINVAL;
152 }
153
154 get_online_cpus();
155 mutex_lock(&microcode_mutex);
156
157 ret = do_microcode_update(buf, len);
158 if (!ret)
159 ret = (ssize_t)len;
160
161 mutex_unlock(&microcode_mutex);
162 put_online_cpus();
163
164 return ret;
165}
166
167static const struct file_operations microcode_fops = {
168 .owner = THIS_MODULE,
169 .write = microcode_write,
170 .open = microcode_open,
171};
172
173static struct miscdevice microcode_dev = {
174 .minor = MICROCODE_MINOR,
175 .name = "microcode",
176 .fops = &microcode_fops,
177};
178
179static int __init microcode_dev_init(void)
180{
181 int error;
182
183 error = misc_register(&microcode_dev);
184 if (error) {
185 printk(KERN_ERR
186 "microcode: can't misc_register on minor=%d\n",
187 MICROCODE_MINOR);
188 return error;
189 }
190
191 return 0;
192}
193
194static void microcode_dev_exit(void)
195{
196 misc_deregister(&microcode_dev);
197}
198
199MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
200#else
201#define microcode_dev_init() 0
202#define microcode_dev_exit() do { } while (0)
203#endif
204
205/* fake device for request_firmware */
206struct platform_device *microcode_pdev;
207
208static ssize_t reload_store(struct sys_device *dev,
209 struct sysdev_attribute *attr,
210 const char *buf, size_t sz)
211{
212 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
213 char *end;
214 unsigned long val = simple_strtoul(buf, &end, 0);
215 int err = 0;
216 int cpu = dev->id;
217
218 if (end == buf)
219 return -EINVAL;
220 if (val == 1) {
221 cpumask_t old = current->cpus_allowed;
222
223 get_online_cpus();
224 if (cpu_online(cpu)) {
225 set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
226 mutex_lock(&microcode_mutex);
227 if (uci->valid) {
228 err = microcode_ops->request_microcode_fw(cpu,
229 &microcode_pdev->dev);
230 if (!err)
231 microcode_ops->apply_microcode(cpu);
232 }
233 mutex_unlock(&microcode_mutex);
234 set_cpus_allowed_ptr(current, &old);
235 }
236 put_online_cpus();
237 }
238 if (err)
239 return err;
240 return sz;
241}
242
243static ssize_t version_show(struct sys_device *dev,
244 struct sysdev_attribute *attr, char *buf)
245{
246 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
247
248 return sprintf(buf, "0x%x\n", uci->cpu_sig.rev);
249}
250
251static ssize_t pf_show(struct sys_device *dev,
252 struct sysdev_attribute *attr, char *buf)
253{
254 struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
255
256 return sprintf(buf, "0x%x\n", uci->cpu_sig.pf);
257}
258
259static SYSDEV_ATTR(reload, 0200, NULL, reload_store);
260static SYSDEV_ATTR(version, 0400, version_show, NULL);
261static SYSDEV_ATTR(processor_flags, 0400, pf_show, NULL);
262
263static struct attribute *mc_default_attrs[] = {
264 &attr_reload.attr,
265 &attr_version.attr,
266 &attr_processor_flags.attr,
267 NULL
268};
269
270static struct attribute_group mc_attr_group = {
271 .attrs = mc_default_attrs,
272 .name = "microcode",
273};
274
275static void microcode_fini_cpu(int cpu)
276{
277 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
278
279 mutex_lock(&microcode_mutex);
280 microcode_ops->microcode_fini_cpu(cpu);
281 uci->valid = 0;
282 mutex_unlock(&microcode_mutex);
283}
284
285static void collect_cpu_info(int cpu)
286{
287 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
288
289 memset(uci, 0, sizeof(*uci));
290 if (!microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig))
291 uci->valid = 1;
292}
293
294static int microcode_resume_cpu(int cpu)
295{
296 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
297 struct cpu_signature nsig;
298
299 pr_debug("microcode: CPU%d resumed\n", cpu);
300
301 if (!uci->mc.valid_mc)
302 return 1;
303
304 /*
305 * Let's verify that the 'cached' ucode does belong
306 * to this cpu (a bit of paranoia):
307 */
308 if (microcode_ops->collect_cpu_info(cpu, &nsig)) {
309 microcode_fini_cpu(cpu);
310 return -1;
311 }
312
313 if (memcmp(&nsig, &uci->cpu_sig, sizeof(nsig))) {
314 microcode_fini_cpu(cpu);
315 /* Should we look for a new ucode here? */
316 return 1;
317 }
318
319 return 0;
320}
321
322void microcode_update_cpu(int cpu)
323{
324 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
325 int err = 0;
326
327 /* We should bind the task to the CPU */
328 BUG_ON(raw_smp_processor_id() != cpu);
329
330 mutex_lock(&microcode_mutex);
331 /*
332 * Check if the system resume is in progress (uci->valid != NULL),
333 * otherwise just request a firmware:
334 */
335 if (uci->valid) {
336 err = microcode_resume_cpu(cpu);
337 } else {
338 collect_cpu_info(cpu);
339 if (uci->valid && system_state == SYSTEM_RUNNING)
340 err = microcode_ops->request_microcode_fw(cpu,
341 &microcode_pdev->dev);
342 }
343
344 if (!err)
345 microcode_ops->apply_microcode(cpu);
346
347 mutex_unlock(&microcode_mutex);
348}
349
350static void microcode_init_cpu(int cpu)
351{
352 cpumask_t old = current->cpus_allowed;
353
354 set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
355 microcode_update_cpu(cpu);
356 set_cpus_allowed_ptr(current, &old);
357}
358
359static int mc_sysdev_add(struct sys_device *sys_dev)
360{
361 int err, cpu = sys_dev->id;
362 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
363
364 if (!cpu_online(cpu))
365 return 0;
366
367 pr_debug("microcode: CPU%d added\n", cpu);
368 memset(uci, 0, sizeof(*uci));
369
370 err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
371 if (err)
372 return err;
373
374 microcode_init_cpu(cpu);
375 return 0;
376}
377
378static int mc_sysdev_remove(struct sys_device *sys_dev)
379{
380 int cpu = sys_dev->id;
381
382 if (!cpu_online(cpu))
383 return 0;
384
385 pr_debug("microcode: CPU%d removed\n", cpu);
386 microcode_fini_cpu(cpu);
387 sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
388 return 0;
389}
390
391static int mc_sysdev_resume(struct sys_device *dev)
392{
393 int cpu = dev->id;
394
395 if (!cpu_online(cpu))
396 return 0;
397
398 /* only CPU 0 will apply ucode here */
399 microcode_update_cpu(0);
400 return 0;
401}
402
403static struct sysdev_driver mc_sysdev_driver = {
404 .add = mc_sysdev_add,
405 .remove = mc_sysdev_remove,
406 .resume = mc_sysdev_resume,
407};
408
409static __cpuinit int
410mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
411{
412 unsigned int cpu = (unsigned long)hcpu;
413 struct sys_device *sys_dev;
414
415 sys_dev = get_cpu_sysdev(cpu);
416 switch (action) {
417 case CPU_ONLINE:
418 case CPU_ONLINE_FROZEN:
419 microcode_init_cpu(cpu);
420 case CPU_DOWN_FAILED:
421 case CPU_DOWN_FAILED_FROZEN:
422 pr_debug("microcode: CPU%d added\n", cpu);
423 if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group))
424 printk(KERN_ERR "microcode: Failed to create the sysfs "
425 "group for CPU%d\n", cpu);
426 break;
427 case CPU_DOWN_PREPARE:
428 case CPU_DOWN_PREPARE_FROZEN:
429 /* Suspend is in progress, only remove the interface */
430 sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
431 pr_debug("microcode: CPU%d removed\n", cpu);
432 break;
433 case CPU_DEAD:
434 case CPU_UP_CANCELED_FROZEN:
435 /* The CPU refused to come up during a system resume */
436 microcode_fini_cpu(cpu);
437 break;
438 }
439 return NOTIFY_OK;
440}
441
442static struct notifier_block __refdata mc_cpu_notifier = {
443 .notifier_call = mc_cpu_callback,
444};
445
446int microcode_init(void *opaque, struct module *module)
447{
448 struct microcode_ops *ops = (struct microcode_ops *)opaque;
449 int error;
450
451 if (microcode_ops) {
452 printk(KERN_ERR "microcode: already loaded the other module\n");
453 return -EEXIST;
454 }
455
456 microcode_ops = ops;
457
458 error = microcode_dev_init();
459 if (error)
460 return error;
461 microcode_pdev = platform_device_register_simple("microcode", -1,
462 NULL, 0);
463 if (IS_ERR(microcode_pdev)) {
464 microcode_dev_exit();
465 return PTR_ERR(microcode_pdev);
466 }
467
468 get_online_cpus();
469 error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);
470 put_online_cpus();
471 if (error) {
472 microcode_dev_exit();
473 platform_device_unregister(microcode_pdev);
474 return error;
475 }
476
477 register_hotcpu_notifier(&mc_cpu_notifier);
478
479 printk(KERN_INFO
480 "Microcode Update Driver: v" MICROCODE_VERSION
481 " <tigran@aivazian.fsnet.co.uk>"
482 " <peter.oruba@amd.com>\n");
483
484 return 0;
485}
486EXPORT_SYMBOL_GPL(microcode_init);
487
488void __exit microcode_exit(void)
489{
490 microcode_dev_exit();
491
492 unregister_hotcpu_notifier(&mc_cpu_notifier);
493
494 get_online_cpus();
495 sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
496 put_online_cpus();
497
498 platform_device_unregister(microcode_pdev);
499
500 microcode_ops = NULL;
501
502 printk(KERN_INFO
503 "Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
504}
505EXPORT_SYMBOL_GPL(microcode_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2025-08-31 06:10:49 -0400