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NFS: Ensure that nfs_link() instantiates the dentry correctly
[linux-2.6/mini2440.git] / arch / i386 / kernel / microcode.c
blob165f13158c60c188a63ddd22530b9bf2bc160108
1 /*
2 * Intel CPU Microcode Update Driver for Linux
3 *
4 * Copyright (C) 2000-2004 Tigran Aivazian
5 *
6 * This driver allows to upgrade microcode on Intel processors
7 * belonging to IA-32 family - PentiumPro, Pentium II,
8 * Pentium III, Xeon, Pentium 4, etc.
9 *
10 * Reference: Section 8.10 of Volume III, Intel Pentium 4 Manual,
11 * Order Number 245472 or free download from:
12 *
13 * http://developer.intel.com/design/pentium4/manuals/245472.htm
14 *
15 * For more information, go to http://www.urbanmyth.org/microcode
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 *
22 * 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com>
23 * Initial release.
24 * 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com>
25 * Added read() support + cleanups.
26 * 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com>
27 * Added 'device trimming' support. open(O_WRONLY) zeroes
28 * and frees the saved copy of applied microcode.
29 * 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com>
30 * Made to use devfs (/dev/cpu/microcode) + cleanups.
31 * 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com>
32 * Added misc device support (now uses both devfs and misc).
33 * Added MICROCODE_IOCFREE ioctl to clear memory.
34 * 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com>
35 * Messages for error cases (non Intel & no suitable microcode).
36 * 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com>
37 * Removed ->release(). Removed exclusive open and status bitmap.
38 * Added microcode_rwsem to serialize read()/write()/ioctl().
39 * Removed global kernel lock usage.
40 * 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com>
41 * Write 0 to 0x8B msr and then cpuid before reading revision,
42 * so that it works even if there were no update done by the
43 * BIOS. Otherwise, reading from 0x8B gives junk (which happened
44 * to be 0 on my machine which is why it worked even when I
45 * disabled update by the BIOS)
46 * Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix.
47 * 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and
48 * Tigran Aivazian <tigran@veritas.com>
49 * Intel Pentium 4 processor support and bugfixes.
50 * 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com>
51 * Bugfix for HT (Hyper-Threading) enabled processors
52 * whereby processor resources are shared by all logical processors
53 * in a single CPU package.
54 * 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and
55 * Tigran Aivazian <tigran@veritas.com>,
56 * Serialize updates as required on HT processors due to speculative
57 * nature of implementation.
58 * 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
59 * Fix the panic when writing zero-length microcode chunk.
60 * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
61 * Jun Nakajima <jun.nakajima@intel.com>
62 * Support for the microcode updates in the new format.
63 * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
64 * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
65 * because we no longer hold a copy of applied microcode
66 * in kernel memory.
67 * 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com>
68 * Fix sigmatch() macro to handle old CPUs with pf == 0.
69 * Thanks to Stuart Swales for pointing out this bug.
70 */
71
72 //#define DEBUG /* pr_debug */
73 #include <linux/kernel.h>
74 #include <linux/init.h>
75 #include <linux/sched.h>
76 #include <linux/module.h>
77 #include <linux/slab.h>
78 #include <linux/vmalloc.h>
79 #include <linux/miscdevice.h>
80 #include <linux/spinlock.h>
81 #include <linux/mm.h>
82
83 #include <asm/msr.h>
84 #include <asm/uaccess.h>
85 #include <asm/processor.h>
86
87 MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
88 MODULE_AUTHOR("Tigran Aivazian <tigran@veritas.com>");
89 MODULE_LICENSE("GPL");
90
91 #define MICROCODE_VERSION "1.14"
92
93 #define DEFAULT_UCODE_DATASIZE (2000) /* 2000 bytes */
94 #define MC_HEADER_SIZE (sizeof (microcode_header_t)) /* 48 bytes */
95 #define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
96 #define EXT_HEADER_SIZE (sizeof (struct extended_sigtable)) /* 20 bytes */
97 #define EXT_SIGNATURE_SIZE (sizeof (struct extended_signature)) /* 12 bytes */
98 #define DWSIZE (sizeof (u32))
99 #define get_totalsize(mc) \
100 (((microcode_t *)mc)->hdr.totalsize ? \
101 ((microcode_t *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
102 #define get_datasize(mc) \
103 (((microcode_t *)mc)->hdr.datasize ? \
104 ((microcode_t *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
105
106 #define sigmatch(s1, s2, p1, p2) \
107 (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
108
109 #define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
110
111 /* serialize access to the physical write to MSR 0x79 */
112 static DEFINE_SPINLOCK(microcode_update_lock);
113
114 /* no concurrent ->write()s are allowed on /dev/cpu/microcode */
115 static DECLARE_MUTEX(microcode_sem);
116
117 static void __user *user_buffer; /* user area microcode data buffer */
118 static unsigned int user_buffer_size; /* it's size */
119
120 typedef enum mc_error_code {
121 MC_SUCCESS = 0,
122 MC_NOTFOUND = 1,
123 MC_MARKED = 2,
124 MC_ALLOCATED = 3,
125 } mc_error_code_t;
126
127 static struct ucode_cpu_info {
128 unsigned int sig;
129 unsigned int pf;
130 unsigned int rev;
131 unsigned int cksum;
132 mc_error_code_t err;
133 microcode_t *mc;
134 } ucode_cpu_info[NR_CPUS];
135
136 static int microcode_open (struct inode *unused1, struct file *unused2)
137 {
138 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
139 }
140
141 static void collect_cpu_info (void *unused)
142 {
143 int cpu_num = smp_processor_id();
144 struct cpuinfo_x86 *c = cpu_data + cpu_num;
145 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
146 unsigned int val[2];
147
148 uci->sig = uci->pf = uci->rev = uci->cksum = 0;
149 uci->err = MC_NOTFOUND;
150 uci->mc = NULL;
151
152 if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
153 cpu_has(c, X86_FEATURE_IA64)) {
154 printk(KERN_ERR "microcode: CPU%d not a capable Intel processor\n", cpu_num);
155 return;
156 } else {
157 uci->sig = cpuid_eax(0x00000001);
158
159 if ((c->x86_model >= 5) || (c->x86 > 6)) {
160 /* get processor flags from MSR 0x17 */
161 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
162 uci->pf = 1 << ((val[1] >> 18) & 7);
163 }
164 }
165
166 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
167 /* see notes above for revision 1.07. Apparent chip bug */
168 serialize_cpu();
169 /* get the current revision from MSR 0x8B */
170 rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
171 pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
172 uci->sig, uci->pf, uci->rev);
173 }
174
175 static inline void mark_microcode_update (int cpu_num, microcode_header_t *mc_header, int sig, int pf, int cksum)
176 {
177 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
178
179 pr_debug("Microcode Found.\n");
180 pr_debug(" Header Revision 0x%x\n", mc_header->hdrver);
181 pr_debug(" Loader Revision 0x%x\n", mc_header->ldrver);
182 pr_debug(" Revision 0x%x \n", mc_header->rev);
183 pr_debug(" Date %x/%x/%x\n",
184 ((mc_header->date >> 24 ) & 0xff),
185 ((mc_header->date >> 16 ) & 0xff),
186 (mc_header->date & 0xFFFF));
187 pr_debug(" Signature 0x%x\n", sig);
188 pr_debug(" Type 0x%x Family 0x%x Model 0x%x Stepping 0x%x\n",
189 ((sig >> 12) & 0x3),
190 ((sig >> 8) & 0xf),
191 ((sig >> 4) & 0xf),
192 ((sig & 0xf)));
193 pr_debug(" Processor Flags 0x%x\n", pf);
194 pr_debug(" Checksum 0x%x\n", cksum);
195
196 if (mc_header->rev < uci->rev) {
197 printk(KERN_ERR "microcode: CPU%d not 'upgrading' to earlier revision"
198 " 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
199 goto out;
200 } else if (mc_header->rev == uci->rev) {
201 /* notify the caller of success on this cpu */
202 uci->err = MC_SUCCESS;
203 printk(KERN_ERR "microcode: CPU%d already at revision"
204 " 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
205 goto out;
206 }
207
208 pr_debug("microcode: CPU%d found a matching microcode update with "
209 " revision 0x%x (current=0x%x)\n", cpu_num, mc_header->rev, uci->rev);
210 uci->cksum = cksum;
211 uci->pf = pf; /* keep the original mc pf for cksum calculation */
212 uci->err = MC_MARKED; /* found the match */
213 out:
214 return;
215 }
216
217 static int find_matching_ucodes (void)
218 {
219 int cursor = 0;
220 int error = 0;
221
222 while (cursor + MC_HEADER_SIZE < user_buffer_size) {
223 microcode_header_t mc_header;
224 void *newmc = NULL;
225 int i, sum, cpu_num, allocated_flag, total_size, data_size, ext_table_size;
226
227 if (copy_from_user(&mc_header, user_buffer + cursor, MC_HEADER_SIZE)) {
228 printk(KERN_ERR "microcode: error! Can not read user data\n");
229 error = -EFAULT;
230 goto out;
231 }
232
233 total_size = get_totalsize(&mc_header);
234 if ((cursor + total_size > user_buffer_size) || (total_size < DEFAULT_UCODE_TOTALSIZE)) {
235 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
236 error = -EINVAL;
237 goto out;
238 }
239
240 data_size = get_datasize(&mc_header);
241 if ((data_size + MC_HEADER_SIZE > total_size) || (data_size < DEFAULT_UCODE_DATASIZE)) {
242 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
243 error = -EINVAL;
244 goto out;
245 }
246
247 if (mc_header.ldrver != 1 || mc_header.hdrver != 1) {
248 printk(KERN_ERR "microcode: error! Unknown microcode update format\n");
249 error = -EINVAL;
250 goto out;
251 }
252
253 for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
254 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
255 if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
256 continue;
257
258 if (sigmatch(mc_header.sig, uci->sig, mc_header.pf, uci->pf))
259 mark_microcode_update(cpu_num, &mc_header, mc_header.sig, mc_header.pf, mc_header.cksum);
260 }
261
262 ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
263 if (ext_table_size) {
264 struct extended_sigtable ext_header;
265 struct extended_signature ext_sig;
266 int ext_sigcount;
267
268 if ((ext_table_size < EXT_HEADER_SIZE)
269 || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
270 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
271 error = -EINVAL;
272 goto out;
273 }
274 if (copy_from_user(&ext_header, user_buffer + cursor
275 + MC_HEADER_SIZE + data_size, EXT_HEADER_SIZE)) {
276 printk(KERN_ERR "microcode: error! Can not read user data\n");
277 error = -EFAULT;
278 goto out;
279 }
280 if (ext_table_size != exttable_size(&ext_header)) {
281 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
282 error = -EFAULT;
283 goto out;
284 }
285
286 ext_sigcount = ext_header.count;
287
288 for (i = 0; i < ext_sigcount; i++) {
289 if (copy_from_user(&ext_sig, user_buffer + cursor + MC_HEADER_SIZE + data_size + EXT_HEADER_SIZE
290 + EXT_SIGNATURE_SIZE * i, EXT_SIGNATURE_SIZE)) {
291 printk(KERN_ERR "microcode: error! Can not read user data\n");
292 error = -EFAULT;
293 goto out;
294 }
295 for (cpu_num = 0; cpu_num < num_online_cpus(); cpu_num++) {
296 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
297 if (uci->err != MC_NOTFOUND) /* already found a match or not an online cpu*/
298 continue;
299 if (sigmatch(ext_sig.sig, uci->sig, ext_sig.pf, uci->pf)) {
300 mark_microcode_update(cpu_num, &mc_header, ext_sig.sig, ext_sig.pf, ext_sig.cksum);
301 }
302 }
303 }
304 }
305 /* now check if any cpu has matched */
306 for (cpu_num = 0, allocated_flag = 0, sum = 0; cpu_num < num_online_cpus(); cpu_num++) {
307 if (ucode_cpu_info[cpu_num].err == MC_MARKED) {
308 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
309 if (!allocated_flag) {
310 allocated_flag = 1;
311 newmc = vmalloc(total_size);
312 if (!newmc) {
313 printk(KERN_ERR "microcode: error! Can not allocate memory\n");
314 error = -ENOMEM;
315 goto out;
316 }
317 if (copy_from_user(newmc + MC_HEADER_SIZE,
318 user_buffer + cursor + MC_HEADER_SIZE,
319 total_size - MC_HEADER_SIZE)) {
320 printk(KERN_ERR "microcode: error! Can not read user data\n");
321 vfree(newmc);
322 error = -EFAULT;
323 goto out;
324 }
325 memcpy(newmc, &mc_header, MC_HEADER_SIZE);
326 /* check extended table checksum */
327 if (ext_table_size) {
328 int ext_table_sum = 0;
329 int * ext_tablep = (((void *) newmc) + MC_HEADER_SIZE + data_size);
330 i = ext_table_size / DWSIZE;
331 while (i--) ext_table_sum += ext_tablep[i];
332 if (ext_table_sum) {
333 printk(KERN_WARNING "microcode: aborting, bad extended signature table checksum\n");
334 vfree(newmc);
335 error = -EINVAL;
336 goto out;
337 }
338 }
339
340 /* calculate the checksum */
341 i = (MC_HEADER_SIZE + data_size) / DWSIZE;
342 while (i--) sum += ((int *)newmc)[i];
343 sum -= (mc_header.sig + mc_header.pf + mc_header.cksum);
344 }
345 ucode_cpu_info[cpu_num].mc = newmc;
346 ucode_cpu_info[cpu_num].err = MC_ALLOCATED; /* mc updated */
347 if (sum + uci->sig + uci->pf + uci->cksum != 0) {
348 printk(KERN_ERR "microcode: CPU%d aborting, bad checksum\n", cpu_num);
349 error = -EINVAL;
350 goto out;
351 }
352 }
353 }
354 cursor += total_size; /* goto the next update patch */
355 } /* end of while */
356 out:
357 return error;
358 }
359
360 static void do_update_one (void * unused)
361 {
362 unsigned long flags;
363 unsigned int val[2];
364 int cpu_num = smp_processor_id();
365 struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
366
367 if (uci->mc == NULL) {
368 printk(KERN_INFO "microcode: No new microcode data for CPU%d\n", cpu_num);
369 return;
370 }
371
372 /* serialize access to the physical write to MSR 0x79 */
373 spin_lock_irqsave(&microcode_update_lock, flags);
374
375 /* write microcode via MSR 0x79 */
376 wrmsr(MSR_IA32_UCODE_WRITE,
377 (unsigned long) uci->mc->bits,
378 (unsigned long) uci->mc->bits >> 16 >> 16);
379 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
380
381 /* see notes above for revision 1.07. Apparent chip bug */
382 serialize_cpu();
383
384 /* get the current revision from MSR 0x8B */
385 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
386
387 /* notify the caller of success on this cpu */
388 uci->err = MC_SUCCESS;
389 spin_unlock_irqrestore(&microcode_update_lock, flags);
390 printk(KERN_INFO "microcode: CPU%d updated from revision "
391 "0x%x to 0x%x, date = %08x \n",
392 cpu_num, uci->rev, val[1], uci->mc->hdr.date);
393 return;
394 }
395
396 static int do_microcode_update (void)
397 {
398 int i, error;
399
400 if (on_each_cpu(collect_cpu_info, NULL, 1, 1) != 0) {
401 printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
402 error = -EIO;
403 goto out;
404 }
405
406 if ((error = find_matching_ucodes())) {
407 printk(KERN_ERR "microcode: Error in the microcode data\n");
408 goto out_free;
409 }
410
411 if (on_each_cpu(do_update_one, NULL, 1, 1) != 0) {
412 printk(KERN_ERR "microcode: Error! Could not run on all processors\n");
413 error = -EIO;
414 }
415
416 out_free:
417 for (i = 0; i < num_online_cpus(); i++) {
418 if (ucode_cpu_info[i].mc) {
419 int j;
420 void *tmp = ucode_cpu_info[i].mc;
421 vfree(tmp);
422 for (j = i; j < num_online_cpus(); j++) {
423 if (ucode_cpu_info[j].mc == tmp)
424 ucode_cpu_info[j].mc = NULL;
425 }
426 }
427 }
428 out:
429 return error;
430 }
431
432 static ssize_t microcode_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos)
433 {
434 ssize_t ret;
435
436 if (len < DEFAULT_UCODE_TOTALSIZE) {
437 printk(KERN_ERR "microcode: not enough data\n");
438 return -EINVAL;
439 }
440
441 if ((len >> PAGE_SHIFT) > num_physpages) {
442 printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages);
443 return -EINVAL;
444 }
445
446 down(&microcode_sem);
447
448 user_buffer = (void __user *) buf;
449 user_buffer_size = (int) len;
450
451 ret = do_microcode_update();
452 if (!ret)
453 ret = (ssize_t)len;
454
455 up(&microcode_sem);
456
457 return ret;
458 }
459
460 static int microcode_ioctl (struct inode *inode, struct file *file,
461 unsigned int cmd, unsigned long arg)
462 {
463 switch (cmd) {
464 /*
465 * XXX: will be removed after microcode_ctl
466 * is updated to ignore failure of this ioctl()
467 */
468 case MICROCODE_IOCFREE:
469 return 0;
470 default:
471 return -EINVAL;
472 }
473 return -EINVAL;
474 }
475
476 static struct file_operations microcode_fops = {
477 .owner = THIS_MODULE,
478 .write = microcode_write,
479 .ioctl = microcode_ioctl,
480 .open = microcode_open,
481 };
482
483 static struct miscdevice microcode_dev = {
484 .minor = MICROCODE_MINOR,
485 .name = "microcode",
486 .devfs_name = "cpu/microcode",
487 .fops = &microcode_fops,
488 };
489
490 static int __init microcode_init (void)
491 {
492 int error;
493
494 error = misc_register(&microcode_dev);
495 if (error) {
496 printk(KERN_ERR
497 "microcode: can't misc_register on minor=%d\n",
498 MICROCODE_MINOR);
499 return error;
500 }
501
502 printk(KERN_INFO
503 "IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@veritas.com>\n");
504 return 0;
505 }
506
507 static void __exit microcode_exit (void)
508 {
509 misc_deregister(&microcode_dev);
510 printk(KERN_INFO "IA-32 Microcode Update Driver v" MICROCODE_VERSION " unregistered\n");
511 }
512
513 module_init(microcode_init)
514 module_exit(microcode_exit)
515 MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
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