Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Intel CPU Microcode Update Driver for Linux | |
3 | * | |
4 | * Copyright (C) 2000-2004 Tigran Aivazian | |
9a3110bf | 5 | * 2006 Shaohua Li <shaohua.li@intel.com> |
1da177e4 LT |
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 */ | |
a9415644 | 74 | #include <linux/capability.h> |
1da177e4 LT |
75 | #include <linux/kernel.h> |
76 | #include <linux/init.h> | |
77 | #include <linux/sched.h> | |
5cf6c541 | 78 | #include <linux/cpumask.h> |
1da177e4 LT |
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> | |
14cc3e2b | 85 | #include <linux/mutex.h> |
a30a6a2c SL |
86 | #include <linux/cpu.h> |
87 | #include <linux/firmware.h> | |
88 | #include <linux/platform_device.h> | |
1da177e4 LT |
89 | |
90 | #include <asm/msr.h> | |
91 | #include <asm/uaccess.h> | |
92 | #include <asm/processor.h> | |
93 | ||
94 | MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver"); | |
95 | MODULE_AUTHOR("Tigran Aivazian <tigran@veritas.com>"); | |
96 | MODULE_LICENSE("GPL"); | |
97 | ||
ba528f28 | 98 | #define MICROCODE_VERSION "1.14a" |
1da177e4 LT |
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 */ | |
119 | static DEFINE_SPINLOCK(microcode_update_lock); | |
120 | ||
121 | /* no concurrent ->write()s are allowed on /dev/cpu/microcode */ | |
14cc3e2b | 122 | static DEFINE_MUTEX(microcode_mutex); |
1da177e4 | 123 | |
1da177e4 | 124 | static struct ucode_cpu_info { |
9a3110bf | 125 | int valid; |
1da177e4 | 126 | unsigned int sig; |
9a3110bf | 127 | unsigned int pf; |
1da177e4 | 128 | unsigned int rev; |
1da177e4 LT |
129 | microcode_t *mc; |
130 | } ucode_cpu_info[NR_CPUS]; | |
1da177e4 | 131 | |
9a3110bf | 132 | static void collect_cpu_info(int cpu_num) |
1da177e4 | 133 | { |
1da177e4 LT |
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 | ||
9a3110bf SL |
138 | /* We should bind the task to the CPU */ |
139 | BUG_ON(raw_smp_processor_id() != cpu_num); | |
140 | uci->pf = uci->rev = 0; | |
1da177e4 | 141 | uci->mc = NULL; |
9a3110bf | 142 | uci->valid = 1; |
1da177e4 LT |
143 | |
144 | if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 || | |
145 | cpu_has(c, X86_FEATURE_IA64)) { | |
9a3110bf SL |
146 | printk(KERN_ERR "microcode: CPU%d not a capable Intel " |
147 | "processor\n", cpu_num); | |
148 | uci->valid = 0; | |
1da177e4 | 149 | return; |
9a3110bf | 150 | } |
1da177e4 | 151 | |
9a3110bf SL |
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); | |
1da177e4 LT |
158 | } |
159 | ||
160 | wrmsr(MSR_IA32_UCODE_REV, 0, 0); | |
245067d1 | 161 | /* see notes above for revision 1.07. Apparent chip bug */ |
487472bc | 162 | sync_core(); |
1da177e4 LT |
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 | ||
9a3110bf SL |
169 | static inline int microcode_update_match(int cpu_num, |
170 | microcode_header_t *mc_header, int sig, int pf) | |
1da177e4 LT |
171 | { |
172 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num; | |
173 | ||
9a3110bf SL |
174 | if (!sigmatch(sig, uci->sig, pf, uci->pf) |
175 | || mc_header->rev <= uci->rev) | |
176 | return 0; | |
177 | return 1; | |
1da177e4 LT |
178 | } |
179 | ||
9a3110bf | 180 | static int microcode_sanity_check(void *mc) |
1da177e4 | 181 | { |
9a3110bf SL |
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 | || (data_size < DEFAULT_UCODE_DATASIZE)) { | |
192 | printk(KERN_ERR "microcode: error! " | |
193 | "Bad data size in microcode data file\n"); | |
194 | return -EINVAL; | |
195 | } | |
1da177e4 | 196 | |
9a3110bf SL |
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; | |
1da177e4 | 209 | } |
9a3110bf SL |
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; | |
1da177e4 | 215 | } |
9a3110bf SL |
216 | ext_sigcount = ext_header->count; |
217 | } | |
1da177e4 | 218 | |
9a3110bf SL |
219 | /* check extended table checksum */ |
220 | if (ext_table_size) { | |
221 | int ext_table_sum = 0; | |
9a4b9efa | 222 | int *ext_tablep = (int *)ext_header; |
9a3110bf SL |
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; | |
1da177e4 | 231 | } |
9a3110bf | 232 | } |
1da177e4 | 233 | |
9a3110bf SL |
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; | |
1da177e4 | 255 | } |
9a3110bf SL |
256 | } |
257 | return 0; | |
258 | } | |
5cf6c541 | 259 | |
9a3110bf SL |
260 | /* |
261 | * return 0 - no update found | |
262 | * return 1 - found update | |
263 | * return < 0 - error | |
264 | */ | |
265 | static 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; | |
294 | find: | |
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 | } | |
1da177e4 | 302 | |
9a3110bf SL |
303 | /* free previous update file */ |
304 | vfree(uci->mc); | |
1da177e4 | 305 | |
9a3110bf SL |
306 | memcpy(new_mc, mc, total_size); |
307 | uci->mc = new_mc; | |
308 | return 1; | |
1da177e4 LT |
309 | } |
310 | ||
9a3110bf | 311 | static void apply_microcode(int cpu) |
1da177e4 LT |
312 | { |
313 | unsigned long flags; | |
314 | unsigned int val[2]; | |
9a3110bf | 315 | int cpu_num = raw_smp_processor_id(); |
1da177e4 LT |
316 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num; |
317 | ||
9a3110bf SL |
318 | /* We should bind the task to the CPU */ |
319 | BUG_ON(cpu_num != cpu); | |
320 | ||
321 | if (uci->mc == NULL) | |
1da177e4 | 322 | return; |
1da177e4 LT |
323 | |
324 | /* serialize access to the physical write to MSR 0x79 */ | |
325 | spin_lock_irqsave(µcode_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 | ||
245067d1 | 333 | /* see notes above for revision 1.07. Apparent chip bug */ |
487472bc | 334 | sync_core(); |
245067d1 | 335 | |
1da177e4 LT |
336 | /* get the current revision from MSR 0x8B */ |
337 | rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]); | |
338 | ||
1da177e4 | 339 | spin_unlock_irqrestore(µcode_update_lock, flags); |
9a3110bf SL |
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 " | |
1da177e4 LT |
346 | "0x%x to 0x%x, date = %08x \n", |
347 | cpu_num, uci->rev, val[1], uci->mc->hdr.date); | |
9a3110bf | 348 | uci->rev = val[1]; |
1da177e4 LT |
349 | } |
350 | ||
9a3110bf SL |
351 | #ifdef CONFIG_MICROCODE_OLD_INTERFACE |
352 | static void __user *user_buffer; /* user area microcode data buffer */ | |
353 | static unsigned int user_buffer_size; /* it's size */ | |
1da177e4 | 354 | |
9a3110bf SL |
355 | static 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; | |
1da177e4 | 366 | } |
9a3110bf SL |
367 | total_size = get_totalsize(&mc_header); |
368 | if ((offset + total_size > user_buffer_size) | |
369 | || (total_size < DEFAULT_UCODE_TOTALSIZE)) { | |
370 | printk(KERN_ERR "microcode: error! Bad total size in microcode " | |
371 | "data file\n"); | |
372 | return -EINVAL; | |
1da177e4 | 373 | } |
9a3110bf SL |
374 | *mc = vmalloc(total_size); |
375 | if (!*mc) | |
376 | return -ENOMEM; | |
377 | if (copy_from_user(*mc, user_buffer + offset, total_size)) { | |
378 | printk(KERN_ERR "microcode: error! Can not read user data\n"); | |
379 | vfree(*mc); | |
380 | return -EFAULT; | |
1da177e4 | 381 | } |
9a3110bf SL |
382 | return offset + total_size; |
383 | } | |
1da177e4 | 384 | |
9a3110bf SL |
385 | static int do_microcode_update (void) |
386 | { | |
387 | long cursor = 0; | |
388 | int error = 0; | |
9a4b9efa | 389 | void *new_mc; |
9a3110bf SL |
390 | int cpu; |
391 | cpumask_t old; | |
392 | ||
393 | old = current->cpus_allowed; | |
394 | ||
395 | while ((cursor = get_next_ucode(&new_mc, cursor)) > 0) { | |
396 | error = microcode_sanity_check(new_mc); | |
397 | if (error) | |
398 | goto out; | |
399 | /* | |
400 | * It's possible the data file has multiple matching ucode, | |
401 | * lets keep searching till the latest version | |
402 | */ | |
403 | for_each_online_cpu(cpu) { | |
404 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu; | |
405 | ||
406 | if (!uci->valid) | |
407 | continue; | |
408 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
409 | error = get_maching_microcode(new_mc, cpu); | |
410 | if (error < 0) | |
411 | goto out; | |
412 | if (error == 1) | |
413 | apply_microcode(cpu); | |
1da177e4 | 414 | } |
9a3110bf | 415 | vfree(new_mc); |
1da177e4 LT |
416 | } |
417 | out: | |
9a3110bf SL |
418 | if (cursor > 0) |
419 | vfree(new_mc); | |
420 | if (cursor < 0) | |
421 | error = cursor; | |
422 | set_cpus_allowed(current, old); | |
1da177e4 LT |
423 | return error; |
424 | } | |
425 | ||
9a3110bf SL |
426 | static int microcode_open (struct inode *unused1, struct file *unused2) |
427 | { | |
428 | return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; | |
429 | } | |
430 | ||
1da177e4 LT |
431 | static ssize_t microcode_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos) |
432 | { | |
433 | ssize_t ret; | |
434 | ||
435 | if (len < DEFAULT_UCODE_TOTALSIZE) { | |
436 | printk(KERN_ERR "microcode: not enough data\n"); | |
437 | return -EINVAL; | |
438 | } | |
439 | ||
440 | if ((len >> PAGE_SHIFT) > num_physpages) { | |
441 | printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages); | |
442 | return -EINVAL; | |
443 | } | |
444 | ||
9a3110bf | 445 | lock_cpu_hotplug(); |
14cc3e2b | 446 | mutex_lock(µcode_mutex); |
1da177e4 LT |
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 | ||
14cc3e2b | 455 | mutex_unlock(µcode_mutex); |
9a3110bf | 456 | unlock_cpu_hotplug(); |
1da177e4 LT |
457 | |
458 | return ret; | |
459 | } | |
460 | ||
1da177e4 LT |
461 | static struct file_operations microcode_fops = { |
462 | .owner = THIS_MODULE, | |
463 | .write = microcode_write, | |
1da177e4 LT |
464 | .open = microcode_open, |
465 | }; | |
466 | ||
467 | static struct miscdevice microcode_dev = { | |
468 | .minor = MICROCODE_MINOR, | |
469 | .name = "microcode", | |
1da177e4 LT |
470 | .fops = µcode_fops, |
471 | }; | |
472 | ||
9a3110bf | 473 | static int __init microcode_dev_init (void) |
1da177e4 LT |
474 | { |
475 | int error; | |
476 | ||
477 | error = misc_register(µcode_dev); | |
478 | if (error) { | |
479 | printk(KERN_ERR | |
480 | "microcode: can't misc_register on minor=%d\n", | |
481 | MICROCODE_MINOR); | |
482 | return error; | |
483 | } | |
484 | ||
9a3110bf SL |
485 | return 0; |
486 | } | |
487 | ||
488 | static void __exit microcode_dev_exit (void) | |
489 | { | |
490 | misc_deregister(µcode_dev); | |
491 | } | |
492 | ||
493 | MODULE_ALIAS_MISCDEV(MICROCODE_MINOR); | |
494 | #else | |
495 | #define microcode_dev_init() 0 | |
496 | #define microcode_dev_exit() do { } while(0) | |
497 | #endif | |
498 | ||
a30a6a2c SL |
499 | static long get_next_ucode_from_buffer(void **mc, void *buf, |
500 | unsigned long size, long offset) | |
501 | { | |
502 | microcode_header_t *mc_header; | |
503 | unsigned long total_size; | |
504 | ||
505 | /* No more data */ | |
506 | if (offset >= size) | |
507 | return 0; | |
508 | mc_header = (microcode_header_t *)(buf + offset); | |
509 | total_size = get_totalsize(mc_header); | |
510 | ||
511 | if ((offset + total_size > size) | |
512 | || (total_size < DEFAULT_UCODE_TOTALSIZE)) { | |
513 | printk(KERN_ERR "microcode: error! Bad data in microcode data file\n"); | |
514 | return -EINVAL; | |
515 | } | |
516 | ||
517 | *mc = vmalloc(total_size); | |
518 | if (!*mc) { | |
519 | printk(KERN_ERR "microcode: error! Can not allocate memory\n"); | |
520 | return -ENOMEM; | |
521 | } | |
522 | memcpy(*mc, buf + offset, total_size); | |
523 | return offset + total_size; | |
524 | } | |
525 | ||
526 | /* fake device for request_firmware */ | |
527 | static struct platform_device *microcode_pdev; | |
528 | ||
529 | static int cpu_request_microcode(int cpu) | |
530 | { | |
531 | char name[30]; | |
532 | struct cpuinfo_x86 *c = cpu_data + cpu; | |
533 | const struct firmware *firmware; | |
9a4b9efa | 534 | void *buf; |
a30a6a2c SL |
535 | unsigned long size; |
536 | long offset = 0; | |
537 | int error; | |
538 | void *mc; | |
539 | ||
540 | /* We should bind the task to the CPU */ | |
541 | BUG_ON(cpu != raw_smp_processor_id()); | |
542 | sprintf(name,"intel-ucode/%02x-%02x-%02x", | |
543 | c->x86, c->x86_model, c->x86_mask); | |
544 | error = request_firmware(&firmware, name, µcode_pdev->dev); | |
545 | if (error) { | |
546 | pr_debug("ucode data file %s load failed\n", name); | |
547 | return error; | |
548 | } | |
549 | buf = (void *)firmware->data; | |
550 | size = firmware->size; | |
551 | while ((offset = get_next_ucode_from_buffer(&mc, buf, size, offset)) | |
552 | > 0) { | |
553 | error = microcode_sanity_check(mc); | |
554 | if (error) | |
555 | break; | |
556 | error = get_maching_microcode(mc, cpu); | |
557 | if (error < 0) | |
558 | break; | |
559 | /* | |
560 | * It's possible the data file has multiple matching ucode, | |
561 | * lets keep searching till the latest version | |
562 | */ | |
563 | if (error == 1) { | |
564 | apply_microcode(cpu); | |
565 | error = 0; | |
566 | } | |
567 | vfree(mc); | |
568 | } | |
569 | if (offset > 0) | |
570 | vfree(mc); | |
571 | if (offset < 0) | |
572 | error = offset; | |
573 | release_firmware(firmware); | |
574 | ||
575 | return error; | |
576 | } | |
577 | ||
578 | static void microcode_init_cpu(int cpu) | |
579 | { | |
580 | cpumask_t old; | |
581 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu; | |
582 | ||
583 | old = current->cpus_allowed; | |
584 | ||
585 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
586 | mutex_lock(µcode_mutex); | |
587 | collect_cpu_info(cpu); | |
588 | if (uci->valid) | |
589 | cpu_request_microcode(cpu); | |
590 | mutex_unlock(µcode_mutex); | |
591 | set_cpus_allowed(current, old); | |
592 | } | |
593 | ||
594 | static void microcode_fini_cpu(int cpu) | |
595 | { | |
596 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu; | |
597 | ||
598 | mutex_lock(µcode_mutex); | |
599 | uci->valid = 0; | |
600 | vfree(uci->mc); | |
601 | uci->mc = NULL; | |
602 | mutex_unlock(µcode_mutex); | |
603 | } | |
604 | ||
9a4b9efa SL |
605 | static ssize_t reload_store(struct sys_device *dev, const char *buf, size_t sz) |
606 | { | |
607 | struct ucode_cpu_info *uci = ucode_cpu_info + dev->id; | |
608 | char *end; | |
609 | unsigned long val = simple_strtoul(buf, &end, 0); | |
610 | int err = 0; | |
611 | int cpu = dev->id; | |
612 | ||
613 | if (end == buf) | |
614 | return -EINVAL; | |
615 | if (val == 1) { | |
616 | cpumask_t old; | |
617 | ||
618 | old = current->cpus_allowed; | |
619 | ||
620 | lock_cpu_hotplug(); | |
621 | set_cpus_allowed(current, cpumask_of_cpu(cpu)); | |
622 | ||
623 | mutex_lock(µcode_mutex); | |
624 | if (uci->valid) | |
625 | err = cpu_request_microcode(cpu); | |
626 | mutex_unlock(µcode_mutex); | |
627 | unlock_cpu_hotplug(); | |
628 | set_cpus_allowed(current, old); | |
629 | } | |
630 | if (err) | |
631 | return err; | |
632 | return sz; | |
633 | } | |
634 | ||
635 | static ssize_t version_show(struct sys_device *dev, char *buf) | |
636 | { | |
637 | struct ucode_cpu_info *uci = ucode_cpu_info + dev->id; | |
638 | ||
639 | return sprintf(buf, "0x%x\n", uci->rev); | |
640 | } | |
641 | ||
642 | static ssize_t pf_show(struct sys_device *dev, char *buf) | |
643 | { | |
644 | struct ucode_cpu_info *uci = ucode_cpu_info + dev->id; | |
645 | ||
646 | return sprintf(buf, "0x%x\n", uci->pf); | |
647 | } | |
648 | ||
649 | static SYSDEV_ATTR(reload, 0200, NULL, reload_store); | |
650 | static SYSDEV_ATTR(version, 0400, version_show, NULL); | |
651 | static SYSDEV_ATTR(processor_flags, 0400, pf_show, NULL); | |
652 | ||
653 | static struct attribute *mc_default_attrs[] = { | |
654 | &attr_reload.attr, | |
655 | &attr_version.attr, | |
656 | &attr_processor_flags.attr, | |
657 | NULL | |
658 | }; | |
659 | ||
660 | static struct attribute_group mc_attr_group = { | |
661 | .attrs = mc_default_attrs, | |
662 | .name = "microcode", | |
663 | }; | |
664 | ||
665 | static int mc_sysdev_add(struct sys_device *sys_dev) | |
666 | { | |
667 | int cpu = sys_dev->id; | |
668 | struct ucode_cpu_info *uci = ucode_cpu_info + cpu; | |
669 | ||
670 | if (!cpu_online(cpu)) | |
671 | return 0; | |
672 | pr_debug("Microcode:CPU %d added\n", cpu); | |
673 | memset(uci, 0, sizeof(*uci)); | |
674 | sysfs_create_group(&sys_dev->kobj, &mc_attr_group); | |
675 | ||
676 | microcode_init_cpu(cpu); | |
677 | return 0; | |
678 | } | |
679 | ||
680 | static int mc_sysdev_remove(struct sys_device *sys_dev) | |
681 | { | |
682 | int cpu = sys_dev->id; | |
683 | ||
684 | if (!cpu_online(cpu)) | |
685 | return 0; | |
686 | pr_debug("Microcode:CPU %d removed\n", cpu); | |
687 | microcode_fini_cpu(cpu); | |
688 | sysfs_remove_group(&sys_dev->kobj, &mc_attr_group); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | static int mc_sysdev_resume(struct sys_device *dev) | |
693 | { | |
694 | int cpu = dev->id; | |
695 | ||
696 | if (!cpu_online(cpu)) | |
697 | return 0; | |
698 | pr_debug("Microcode:CPU %d resumed\n", cpu); | |
699 | /* only CPU 0 will apply ucode here */ | |
700 | apply_microcode(0); | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static struct sysdev_driver mc_sysdev_driver = { | |
705 | .add = mc_sysdev_add, | |
706 | .remove = mc_sysdev_remove, | |
707 | .resume = mc_sysdev_resume, | |
708 | }; | |
709 | ||
710 | #ifdef CONFIG_HOTPLUG_CPU | |
711 | static __cpuinit int | |
712 | mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu) | |
713 | { | |
714 | unsigned int cpu = (unsigned long)hcpu; | |
715 | struct sys_device *sys_dev; | |
716 | ||
717 | sys_dev = get_cpu_sysdev(cpu); | |
718 | switch (action) { | |
719 | case CPU_ONLINE: | |
720 | case CPU_DOWN_FAILED: | |
721 | mc_sysdev_add(sys_dev); | |
722 | break; | |
723 | case CPU_DOWN_PREPARE: | |
724 | mc_sysdev_remove(sys_dev); | |
725 | break; | |
726 | } | |
727 | return NOTIFY_OK; | |
728 | } | |
729 | ||
730 | static struct notifier_block mc_cpu_notifier = { | |
731 | .notifier_call = mc_cpu_callback, | |
732 | }; | |
733 | #endif | |
734 | ||
9a3110bf SL |
735 | static int __init microcode_init (void) |
736 | { | |
737 | int error; | |
738 | ||
739 | error = microcode_dev_init(); | |
740 | if (error) | |
741 | return error; | |
a30a6a2c SL |
742 | microcode_pdev = platform_device_register_simple("microcode", -1, |
743 | NULL, 0); | |
744 | if (IS_ERR(microcode_pdev)) { | |
745 | microcode_dev_exit(); | |
746 | return PTR_ERR(microcode_pdev); | |
747 | } | |
9a3110bf | 748 | |
9a4b9efa SL |
749 | lock_cpu_hotplug(); |
750 | error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver); | |
751 | unlock_cpu_hotplug(); | |
752 | if (error) { | |
753 | microcode_dev_exit(); | |
754 | platform_device_unregister(microcode_pdev); | |
755 | return error; | |
756 | } | |
757 | ||
758 | register_hotcpu_notifier(&mc_cpu_notifier); | |
759 | ||
1da177e4 LT |
760 | printk(KERN_INFO |
761 | "IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@veritas.com>\n"); | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static void __exit microcode_exit (void) | |
766 | { | |
9a3110bf | 767 | microcode_dev_exit(); |
9a4b9efa SL |
768 | |
769 | unregister_hotcpu_notifier(&mc_cpu_notifier); | |
770 | ||
771 | lock_cpu_hotplug(); | |
772 | sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver); | |
773 | unlock_cpu_hotplug(); | |
774 | ||
a30a6a2c | 775 | platform_device_unregister(microcode_pdev); |
1da177e4 LT |
776 | } |
777 | ||
778 | module_init(microcode_init) | |
779 | module_exit(microcode_exit) |