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TOMOYO Linux Cross Reference
Linux/arch/x86/kernel/cpu/microcode/intel.c

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  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  * Intel CPU microcode early update for Linux
  8  *
  9  * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
 10  *                    H Peter Anvin" <hpa@zytor.com>
 11  *
 12  * This program is free software; you can redistribute it and/or
 13  * modify it under the terms of the GNU General Public License
 14  * as published by the Free Software Foundation; either version
 15  * 2 of the License, or (at your option) any later version.
 16  */
 17 
 18 /*
 19  * This needs to be before all headers so that pr_debug in printk.h doesn't turn
 20  * printk calls into no_printk().
 21  *
 22  *#define DEBUG
 23  */
 24 #define pr_fmt(fmt) "microcode: " fmt
 25 
 26 #include <linux/earlycpio.h>
 27 #include <linux/firmware.h>
 28 #include <linux/uaccess.h>
 29 #include <linux/vmalloc.h>
 30 #include <linux/initrd.h>
 31 #include <linux/kernel.h>
 32 #include <linux/slab.h>
 33 #include <linux/cpu.h>
 34 #include <linux/mm.h>
 35 
 36 #include <asm/microcode_intel.h>
 37 #include <asm/processor.h>
 38 #include <asm/tlbflush.h>
 39 #include <asm/setup.h>
 40 #include <asm/msr.h>
 41 
 42 static unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
 43 static struct mc_saved_data {
 44         unsigned int mc_saved_count;
 45         struct microcode_intel **mc_saved;
 46 } mc_saved_data;
 47 
 48 static enum ucode_state
 49 load_microcode_early(struct microcode_intel **saved,
 50                      unsigned int num_saved, struct ucode_cpu_info *uci)
 51 {
 52         struct microcode_intel *ucode_ptr, *new_mc = NULL;
 53         struct microcode_header_intel *mc_hdr;
 54         int new_rev, ret, i;
 55 
 56         new_rev = uci->cpu_sig.rev;
 57 
 58         for (i = 0; i < num_saved; i++) {
 59                 ucode_ptr = saved[i];
 60                 mc_hdr    = (struct microcode_header_intel *)ucode_ptr;
 61 
 62                 ret = has_newer_microcode(ucode_ptr,
 63                                           uci->cpu_sig.sig,
 64                                           uci->cpu_sig.pf,
 65                                           new_rev);
 66                 if (!ret)
 67                         continue;
 68 
 69                 new_rev = mc_hdr->rev;
 70                 new_mc  = ucode_ptr;
 71         }
 72 
 73         if (!new_mc)
 74                 return UCODE_NFOUND;
 75 
 76         uci->mc = (struct microcode_intel *)new_mc;
 77         return UCODE_OK;
 78 }
 79 
 80 static inline void
 81 copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd,
 82                   unsigned long off, int num_saved)
 83 {
 84         int i;
 85 
 86         for (i = 0; i < num_saved; i++)
 87                 mc_saved[i] = (struct microcode_intel *)(initrd[i] + off);
 88 }
 89 
 90 #ifdef CONFIG_X86_32
 91 static void
 92 microcode_phys(struct microcode_intel **mc_saved_tmp,
 93                struct mc_saved_data *mc_saved_data)
 94 {
 95         int i;
 96         struct microcode_intel ***mc_saved;
 97 
 98         mc_saved = (struct microcode_intel ***)
 99                    __pa_nodebug(&mc_saved_data->mc_saved);
100         for (i = 0; i < mc_saved_data->mc_saved_count; i++) {
101                 struct microcode_intel *p;
102 
103                 p = *(struct microcode_intel **)
104                         __pa_nodebug(mc_saved_data->mc_saved + i);
105                 mc_saved_tmp[i] = (struct microcode_intel *)__pa_nodebug(p);
106         }
107 }
108 #endif
109 
110 static enum ucode_state
111 load_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
112                unsigned long initrd_start, struct ucode_cpu_info *uci)
113 {
114         struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
115         unsigned int count = mc_saved_data->mc_saved_count;
116 
117         if (!mc_saved_data->mc_saved) {
118                 copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
119 
120                 return load_microcode_early(mc_saved_tmp, count, uci);
121         } else {
122 #ifdef CONFIG_X86_32
123                 microcode_phys(mc_saved_tmp, mc_saved_data);
124                 return load_microcode_early(mc_saved_tmp, count, uci);
125 #else
126                 return load_microcode_early(mc_saved_data->mc_saved,
127                                                     count, uci);
128 #endif
129         }
130 }
131 
132 /*
133  * Given CPU signature and a microcode patch, this function finds if the
134  * microcode patch has matching family and model with the CPU.
135  */
136 static enum ucode_state
137 matching_model_microcode(struct microcode_header_intel *mc_header,
138                         unsigned long sig)
139 {
140         unsigned int fam, model;
141         unsigned int fam_ucode, model_ucode;
142         struct extended_sigtable *ext_header;
143         unsigned long total_size = get_totalsize(mc_header);
144         unsigned long data_size = get_datasize(mc_header);
145         int ext_sigcount, i;
146         struct extended_signature *ext_sig;
147 
148         fam   = x86_family(sig);
149         model = x86_model(sig);
150 
151         fam_ucode   = x86_family(mc_header->sig);
152         model_ucode = x86_model(mc_header->sig);
153 
154         if (fam == fam_ucode && model == model_ucode)
155                 return UCODE_OK;
156 
157         /* Look for ext. headers: */
158         if (total_size <= data_size + MC_HEADER_SIZE)
159                 return UCODE_NFOUND;
160 
161         ext_header   = (void *) mc_header + data_size + MC_HEADER_SIZE;
162         ext_sig      = (void *)ext_header + EXT_HEADER_SIZE;
163         ext_sigcount = ext_header->count;
164 
165         for (i = 0; i < ext_sigcount; i++) {
166                 fam_ucode   = x86_family(ext_sig->sig);
167                 model_ucode = x86_model(ext_sig->sig);
168 
169                 if (fam == fam_ucode && model == model_ucode)
170                         return UCODE_OK;
171 
172                 ext_sig++;
173         }
174         return UCODE_NFOUND;
175 }
176 
177 static int
178 save_microcode(struct mc_saved_data *mc_saved_data,
179                struct microcode_intel **mc_saved_src,
180                unsigned int mc_saved_count)
181 {
182         int i, j;
183         struct microcode_intel **saved_ptr;
184         int ret;
185 
186         if (!mc_saved_count)
187                 return -EINVAL;
188 
189         /*
190          * Copy new microcode data.
191          */
192         saved_ptr = kcalloc(mc_saved_count, sizeof(struct microcode_intel *), GFP_KERNEL);
193         if (!saved_ptr)
194                 return -ENOMEM;
195 
196         for (i = 0; i < mc_saved_count; i++) {
197                 struct microcode_header_intel *mc_hdr;
198                 struct microcode_intel *mc;
199                 unsigned long size;
200 
201                 if (!mc_saved_src[i]) {
202                         ret = -EINVAL;
203                         goto err;
204                 }
205 
206                 mc     = mc_saved_src[i];
207                 mc_hdr = &mc->hdr;
208                 size   = get_totalsize(mc_hdr);
209 
210                 saved_ptr[i] = kmalloc(size, GFP_KERNEL);
211                 if (!saved_ptr[i]) {
212                         ret = -ENOMEM;
213                         goto err;
214                 }
215 
216                 memcpy(saved_ptr[i], mc, size);
217         }
218 
219         /*
220          * Point to newly saved microcode.
221          */
222         mc_saved_data->mc_saved = saved_ptr;
223         mc_saved_data->mc_saved_count = mc_saved_count;
224 
225         return 0;
226 
227 err:
228         for (j = 0; j <= i; j++)
229                 kfree(saved_ptr[j]);
230         kfree(saved_ptr);
231 
232         return ret;
233 }
234 
235 /*
236  * A microcode patch in ucode_ptr is saved into mc_saved
237  * - if it has matching signature and newer revision compared to an existing
238  *   patch mc_saved.
239  * - or if it is a newly discovered microcode patch.
240  *
241  * The microcode patch should have matching model with CPU.
242  *
243  * Returns: The updated number @num_saved of saved microcode patches.
244  */
245 static unsigned int _save_mc(struct microcode_intel **mc_saved,
246                              u8 *ucode_ptr, unsigned int num_saved)
247 {
248         struct microcode_header_intel *mc_hdr, *mc_saved_hdr;
249         unsigned int sig, pf;
250         int found = 0, i;
251 
252         mc_hdr = (struct microcode_header_intel *)ucode_ptr;
253 
254         for (i = 0; i < num_saved; i++) {
255                 mc_saved_hdr = (struct microcode_header_intel *)mc_saved[i];
256                 sig          = mc_saved_hdr->sig;
257                 pf           = mc_saved_hdr->pf;
258 
259                 if (!find_matching_signature(ucode_ptr, sig, pf))
260                         continue;
261 
262                 found = 1;
263 
264                 if (mc_hdr->rev <= mc_saved_hdr->rev)
265                         continue;
266 
267                 /*
268                  * Found an older ucode saved earlier. Replace it with
269                  * this newer one.
270                  */
271                 mc_saved[i] = (struct microcode_intel *)ucode_ptr;
272                 break;
273         }
274 
275         /* Newly detected microcode, save it to memory. */
276         if (i >= num_saved && !found)
277                 mc_saved[num_saved++] = (struct microcode_intel *)ucode_ptr;
278 
279         return num_saved;
280 }
281 
282 /*
283  * Get microcode matching with BSP's model. Only CPUs with the same model as
284  * BSP can stay in the platform.
285  */
286 static enum ucode_state __init
287 get_matching_model_microcode(int cpu, unsigned long start,
288                              void *data, size_t size,
289                              struct mc_saved_data *mc_saved_data,
290                              unsigned long *mc_saved_in_initrd,
291                              struct ucode_cpu_info *uci)
292 {
293         u8 *ucode_ptr = data;
294         unsigned int leftover = size;
295         enum ucode_state state = UCODE_OK;
296         unsigned int mc_size;
297         struct microcode_header_intel *mc_header;
298         struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
299         unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
300         int i;
301 
302         while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) {
303 
304                 if (leftover < sizeof(mc_header))
305                         break;
306 
307                 mc_header = (struct microcode_header_intel *)ucode_ptr;
308 
309                 mc_size = get_totalsize(mc_header);
310                 if (!mc_size || mc_size > leftover ||
311                         microcode_sanity_check(ucode_ptr, 0) < 0)
312                         break;
313 
314                 leftover -= mc_size;
315 
316                 /*
317                  * Since APs with same family and model as the BSP may boot in
318                  * the platform, we need to find and save microcode patches
319                  * with the same family and model as the BSP.
320                  */
321                 if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
322                          UCODE_OK) {
323                         ucode_ptr += mc_size;
324                         continue;
325                 }
326 
327                 mc_saved_count = _save_mc(mc_saved_tmp, ucode_ptr, mc_saved_count);
328 
329                 ucode_ptr += mc_size;
330         }
331 
332         if (leftover) {
333                 state = UCODE_ERROR;
334                 goto out;
335         }
336 
337         if (mc_saved_count == 0) {
338                 state = UCODE_NFOUND;
339                 goto out;
340         }
341 
342         for (i = 0; i < mc_saved_count; i++)
343                 mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
344 
345         mc_saved_data->mc_saved_count = mc_saved_count;
346 out:
347         return state;
348 }
349 
350 static int collect_cpu_info_early(struct ucode_cpu_info *uci)
351 {
352         unsigned int val[2];
353         unsigned int family, model;
354         struct cpu_signature csig;
355         unsigned int eax, ebx, ecx, edx;
356 
357         csig.sig = 0;
358         csig.pf = 0;
359         csig.rev = 0;
360 
361         memset(uci, 0, sizeof(*uci));
362 
363         eax = 0x00000001;
364         ecx = 0;
365         native_cpuid(&eax, &ebx, &ecx, &edx);
366         csig.sig = eax;
367 
368         family = x86_family(csig.sig);
369         model  = x86_model(csig.sig);
370 
371         if ((model >= 5) || (family > 6)) {
372                 /* get processor flags from MSR 0x17 */
373                 native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
374                 csig.pf = 1 << ((val[1] >> 18) & 7);
375         }
376         native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
377 
378         /* As documented in the SDM: Do a CPUID 1 here */
379         sync_core();
380 
381         /* get the current revision from MSR 0x8B */
382         native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
383 
384         csig.rev = val[1];
385 
386         uci->cpu_sig = csig;
387         uci->valid = 1;
388 
389         return 0;
390 }
391 
392 static void show_saved_mc(void)
393 {
394 #ifdef DEBUG
395         int i, j;
396         unsigned int sig, pf, rev, total_size, data_size, date;
397         struct ucode_cpu_info uci;
398 
399         if (mc_saved_data.mc_saved_count == 0) {
400                 pr_debug("no microcode data saved.\n");
401                 return;
402         }
403         pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count);
404 
405         collect_cpu_info_early(&uci);
406 
407         sig = uci.cpu_sig.sig;
408         pf = uci.cpu_sig.pf;
409         rev = uci.cpu_sig.rev;
410         pr_debug("CPU: sig=0x%x, pf=0x%x, rev=0x%x\n", sig, pf, rev);
411 
412         for (i = 0; i < mc_saved_data.mc_saved_count; i++) {
413                 struct microcode_header_intel *mc_saved_header;
414                 struct extended_sigtable *ext_header;
415                 int ext_sigcount;
416                 struct extended_signature *ext_sig;
417 
418                 mc_saved_header = (struct microcode_header_intel *)
419                                   mc_saved_data.mc_saved[i];
420                 sig = mc_saved_header->sig;
421                 pf = mc_saved_header->pf;
422                 rev = mc_saved_header->rev;
423                 total_size = get_totalsize(mc_saved_header);
424                 data_size = get_datasize(mc_saved_header);
425                 date = mc_saved_header->date;
426 
427                 pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, toal size=0x%x, date = %04x-%02x-%02x\n",
428                          i, sig, pf, rev, total_size,
429                          date & 0xffff,
430                          date >> 24,
431                          (date >> 16) & 0xff);
432 
433                 /* Look for ext. headers: */
434                 if (total_size <= data_size + MC_HEADER_SIZE)
435                         continue;
436 
437                 ext_header = (void *) mc_saved_header + data_size + MC_HEADER_SIZE;
438                 ext_sigcount = ext_header->count;
439                 ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
440 
441                 for (j = 0; j < ext_sigcount; j++) {
442                         sig = ext_sig->sig;
443                         pf = ext_sig->pf;
444 
445                         pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n",
446                                  j, sig, pf);
447 
448                         ext_sig++;
449                 }
450 
451         }
452 #endif
453 }
454 
455 #ifdef CONFIG_HOTPLUG_CPU
456 static DEFINE_MUTEX(x86_cpu_microcode_mutex);
457 /*
458  * Save this mc into mc_saved_data. So it will be loaded early when a CPU is
459  * hot added or resumes.
460  *
461  * Please make sure this mc should be a valid microcode patch before calling
462  * this function.
463  */
464 int save_mc_for_early(u8 *mc)
465 {
466         struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
467         unsigned int mc_saved_count_init;
468         unsigned int mc_saved_count;
469         struct microcode_intel **mc_saved;
470         int ret = 0;
471         int i;
472 
473         /*
474          * Hold hotplug lock so mc_saved_data is not accessed by a CPU in
475          * hotplug.
476          */
477         mutex_lock(&x86_cpu_microcode_mutex);
478 
479         mc_saved_count_init = mc_saved_data.mc_saved_count;
480         mc_saved_count = mc_saved_data.mc_saved_count;
481         mc_saved = mc_saved_data.mc_saved;
482 
483         if (mc_saved && mc_saved_count)
484                 memcpy(mc_saved_tmp, mc_saved,
485                        mc_saved_count * sizeof(struct microcode_intel *));
486         /*
487          * Save the microcode patch mc in mc_save_tmp structure if it's a newer
488          * version.
489          */
490         mc_saved_count = _save_mc(mc_saved_tmp, mc, mc_saved_count);
491 
492         /*
493          * Save the mc_save_tmp in global mc_saved_data.
494          */
495         ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count);
496         if (ret) {
497                 pr_err("Cannot save microcode patch.\n");
498                 goto out;
499         }
500 
501         show_saved_mc();
502 
503         /*
504          * Free old saved microcode data.
505          */
506         if (mc_saved) {
507                 for (i = 0; i < mc_saved_count_init; i++)
508                         kfree(mc_saved[i]);
509                 kfree(mc_saved);
510         }
511 
512 out:
513         mutex_unlock(&x86_cpu_microcode_mutex);
514 
515         return ret;
516 }
517 EXPORT_SYMBOL_GPL(save_mc_for_early);
518 #endif
519 
520 static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
521 {
522 #ifdef CONFIG_X86_64
523         unsigned int eax = 0x00000001, ebx, ecx = 0, edx;
524         char name[30];
525 
526         native_cpuid(&eax, &ebx, &ecx, &edx);
527 
528         sprintf(name, "intel-ucode/%02x-%02x-%02x",
529                       x86_family(eax), x86_model(eax), x86_stepping(eax));
530 
531         return get_builtin_firmware(cp, name);
532 #else
533         return false;
534 #endif
535 }
536 
537 static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
538 static __init enum ucode_state
539 scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
540                unsigned long start, unsigned long size,
541                struct ucode_cpu_info *uci)
542 {
543         struct cpio_data cd;
544         long offset = 0;
545 #ifdef CONFIG_X86_32
546         char *p = (char *)__pa_nodebug(ucode_name);
547 #else
548         char *p = ucode_name;
549 #endif
550 
551         cd.data = NULL;
552         cd.size = 0;
553 
554         /* try built-in microcode if no initrd */
555         if (!size) {
556                 if (!load_builtin_intel_microcode(&cd))
557                         return UCODE_ERROR;
558         } else {
559                 cd = find_cpio_data(p, (void *)start, size, &offset);
560                 if (!cd.data)
561                         return UCODE_ERROR;
562         }
563 
564         return get_matching_model_microcode(0, start, cd.data, cd.size,
565                                             mc_saved_data, initrd, uci);
566 }
567 
568 /*
569  * Print ucode update info.
570  */
571 static void
572 print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
573 {
574         int cpu = smp_processor_id();
575 
576         pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
577                 cpu,
578                 uci->cpu_sig.rev,
579                 date & 0xffff,
580                 date >> 24,
581                 (date >> 16) & 0xff);
582 }
583 
584 #ifdef CONFIG_X86_32
585 
586 static int delay_ucode_info;
587 static int current_mc_date;
588 
589 /*
590  * Print early updated ucode info after printk works. This is delayed info dump.
591  */
592 void show_ucode_info_early(void)
593 {
594         struct ucode_cpu_info uci;
595 
596         if (delay_ucode_info) {
597                 collect_cpu_info_early(&uci);
598                 print_ucode_info(&uci, current_mc_date);
599                 delay_ucode_info = 0;
600         }
601 }
602 
603 /*
604  * At this point, we can not call printk() yet. Keep microcode patch number in
605  * mc_saved_data.mc_saved and delay printing microcode info in
606  * show_ucode_info_early() until printk() works.
607  */
608 static void print_ucode(struct ucode_cpu_info *uci)
609 {
610         struct microcode_intel *mc_intel;
611         int *delay_ucode_info_p;
612         int *current_mc_date_p;
613 
614         mc_intel = uci->mc;
615         if (mc_intel == NULL)
616                 return;
617 
618         delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info);
619         current_mc_date_p = (int *)__pa_nodebug(&current_mc_date);
620 
621         *delay_ucode_info_p = 1;
622         *current_mc_date_p = mc_intel->hdr.date;
623 }
624 #else
625 
626 /*
627  * Flush global tlb. We only do this in x86_64 where paging has been enabled
628  * already and PGE should be enabled as well.
629  */
630 static inline void flush_tlb_early(void)
631 {
632         __native_flush_tlb_global_irq_disabled();
633 }
634 
635 static inline void print_ucode(struct ucode_cpu_info *uci)
636 {
637         struct microcode_intel *mc_intel;
638 
639         mc_intel = uci->mc;
640         if (mc_intel == NULL)
641                 return;
642 
643         print_ucode_info(uci, mc_intel->hdr.date);
644 }
645 #endif
646 
647 static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
648 {
649         struct microcode_intel *mc_intel;
650         unsigned int val[2];
651 
652         mc_intel = uci->mc;
653         if (mc_intel == NULL)
654                 return 0;
655 
656         /* write microcode via MSR 0x79 */
657         native_wrmsr(MSR_IA32_UCODE_WRITE,
658               (unsigned long) mc_intel->bits,
659               (unsigned long) mc_intel->bits >> 16 >> 16);
660         native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
661 
662         /* As documented in the SDM: Do a CPUID 1 here */
663         sync_core();
664 
665         /* get the current revision from MSR 0x8B */
666         native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
667         if (val[1] != mc_intel->hdr.rev)
668                 return -1;
669 
670 #ifdef CONFIG_X86_64
671         /* Flush global tlb. This is precaution. */
672         flush_tlb_early();
673 #endif
674         uci->cpu_sig.rev = val[1];
675 
676         if (early)
677                 print_ucode(uci);
678         else
679                 print_ucode_info(uci, mc_intel->hdr.date);
680 
681         return 0;
682 }
683 
684 /*
685  * This function converts microcode patch offsets previously stored in
686  * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
687  */
688 int __init save_microcode_in_initrd_intel(void)
689 {
690         unsigned int count = mc_saved_data.mc_saved_count;
691         struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
692         int ret = 0;
693 
694         if (count == 0)
695                 return ret;
696 
697         copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
698         ret = save_microcode(&mc_saved_data, mc_saved, count);
699         if (ret)
700                 pr_err("Cannot save microcode patches from initrd.\n");
701 
702         show_saved_mc();
703 
704         return ret;
705 }
706 
707 static void __init
708 _load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
709                       unsigned long *initrd,
710                       unsigned long start, unsigned long size)
711 {
712         struct ucode_cpu_info uci;
713         enum ucode_state ret;
714 
715         collect_cpu_info_early(&uci);
716 
717         ret = scan_microcode(mc_saved_data, initrd, start, size, &uci);
718         if (ret != UCODE_OK)
719                 return;
720 
721         ret = load_microcode(mc_saved_data, initrd, start, &uci);
722         if (ret != UCODE_OK)
723                 return;
724 
725         apply_microcode_early(&uci, true);
726 }
727 
728 void __init load_ucode_intel_bsp(void)
729 {
730         u64 start, size;
731 #ifdef CONFIG_X86_32
732         struct boot_params *p;
733 
734         p       = (struct boot_params *)__pa_nodebug(&boot_params);
735         size    = p->hdr.ramdisk_size;
736 
737         /*
738          * Set start only if we have an initrd image. We cannot use initrd_start
739          * because it is not set that early yet.
740          */
741         start   = (size ? p->hdr.ramdisk_image : 0);
742 
743         _load_ucode_intel_bsp((struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
744                               (unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
745                               start, size);
746 #else
747         size    = boot_params.hdr.ramdisk_size;
748         start   = (size ? boot_params.hdr.ramdisk_image + PAGE_OFFSET : 0);
749 
750         _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
751 #endif
752 }
753 
754 void load_ucode_intel_ap(void)
755 {
756         struct mc_saved_data *mc_saved_data_p;
757         struct ucode_cpu_info uci;
758         unsigned long *mc_saved_in_initrd_p;
759         enum ucode_state ret;
760 #ifdef CONFIG_X86_32
761 
762         mc_saved_in_initrd_p = (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
763         mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
764 #else
765         mc_saved_in_initrd_p = mc_saved_in_initrd;
766         mc_saved_data_p = &mc_saved_data;
767 #endif
768 
769         /*
770          * If there is no valid ucode previously saved in memory, no need to
771          * update ucode on this AP.
772          */
773         if (mc_saved_data_p->mc_saved_count == 0)
774                 return;
775 
776         collect_cpu_info_early(&uci);
777         ret = load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
778                              get_initrd_start_addr(), &uci);
779 
780         if (ret != UCODE_OK)
781                 return;
782 
783         apply_microcode_early(&uci, true);
784 }
785 
786 void reload_ucode_intel(void)
787 {
788         struct ucode_cpu_info uci;
789         enum ucode_state ret;
790 
791         if (!mc_saved_data.mc_saved_count)
792                 return;
793 
794         collect_cpu_info_early(&uci);
795 
796         ret = load_microcode_early(mc_saved_data.mc_saved,
797                                    mc_saved_data.mc_saved_count, &uci);
798         if (ret != UCODE_OK)
799                 return;
800 
801         apply_microcode_early(&uci, false);
802 }
803 
804 static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
805 {
806         struct cpuinfo_x86 *c = &cpu_data(cpu_num);
807         unsigned int val[2];
808 
809         memset(csig, 0, sizeof(*csig));
810 
811         csig->sig = cpuid_eax(0x00000001);
812 
813         if ((c->x86_model >= 5) || (c->x86 > 6)) {
814                 /* get processor flags from MSR 0x17 */
815                 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
816                 csig->pf = 1 << ((val[1] >> 18) & 7);
817         }
818 
819         csig->rev = c->microcode;
820         pr_info("CPU%d sig=0x%x, pf=0x%x, revision=0x%x\n",
821                 cpu_num, csig->sig, csig->pf, csig->rev);
822 
823         return 0;
824 }
825 
826 /*
827  * return 0 - no update found
828  * return 1 - found update
829  */
830 static int get_matching_mc(struct microcode_intel *mc_intel, int cpu)
831 {
832         struct cpu_signature cpu_sig;
833         unsigned int csig, cpf, crev;
834 
835         collect_cpu_info(cpu, &cpu_sig);
836 
837         csig = cpu_sig.sig;
838         cpf = cpu_sig.pf;
839         crev = cpu_sig.rev;
840 
841         return has_newer_microcode(mc_intel, csig, cpf, crev);
842 }
843 
844 static int apply_microcode_intel(int cpu)
845 {
846         struct microcode_intel *mc_intel;
847         struct ucode_cpu_info *uci;
848         unsigned int val[2];
849         int cpu_num = raw_smp_processor_id();
850         struct cpuinfo_x86 *c = &cpu_data(cpu_num);
851 
852         uci = ucode_cpu_info + cpu;
853         mc_intel = uci->mc;
854 
855         /* We should bind the task to the CPU */
856         BUG_ON(cpu_num != cpu);
857 
858         if (mc_intel == NULL)
859                 return 0;
860 
861         /*
862          * Microcode on this CPU could be updated earlier. Only apply the
863          * microcode patch in mc_intel when it is newer than the one on this
864          * CPU.
865          */
866         if (get_matching_mc(mc_intel, cpu) == 0)
867                 return 0;
868 
869         /* write microcode via MSR 0x79 */
870         wrmsr(MSR_IA32_UCODE_WRITE,
871               (unsigned long) mc_intel->bits,
872               (unsigned long) mc_intel->bits >> 16 >> 16);
873         wrmsr(MSR_IA32_UCODE_REV, 0, 0);
874 
875         /* As documented in the SDM: Do a CPUID 1 here */
876         sync_core();
877 
878         /* get the current revision from MSR 0x8B */
879         rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
880 
881         if (val[1] != mc_intel->hdr.rev) {
882                 pr_err("CPU%d update to revision 0x%x failed\n",
883                        cpu_num, mc_intel->hdr.rev);
884                 return -1;
885         }
886         pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n",
887                 cpu_num, val[1],
888                 mc_intel->hdr.date & 0xffff,
889                 mc_intel->hdr.date >> 24,
890                 (mc_intel->hdr.date >> 16) & 0xff);
891 
892         uci->cpu_sig.rev = val[1];
893         c->microcode = val[1];
894 
895         return 0;
896 }
897 
898 static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
899                                 int (*get_ucode_data)(void *, const void *, size_t))
900 {
901         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
902         u8 *ucode_ptr = data, *new_mc = NULL, *mc = NULL;
903         int new_rev = uci->cpu_sig.rev;
904         unsigned int leftover = size;
905         enum ucode_state state = UCODE_OK;
906         unsigned int curr_mc_size = 0;
907         unsigned int csig, cpf;
908 
909         while (leftover) {
910                 struct microcode_header_intel mc_header;
911                 unsigned int mc_size;
912 
913                 if (leftover < sizeof(mc_header)) {
914                         pr_err("error! Truncated header in microcode data file\n");
915                         break;
916                 }
917 
918                 if (get_ucode_data(&mc_header, ucode_ptr, sizeof(mc_header)))
919                         break;
920 
921                 mc_size = get_totalsize(&mc_header);
922                 if (!mc_size || mc_size > leftover) {
923                         pr_err("error! Bad data in microcode data file\n");
924                         break;
925                 }
926 
927                 /* For performance reasons, reuse mc area when possible */
928                 if (!mc || mc_size > curr_mc_size) {
929                         vfree(mc);
930                         mc = vmalloc(mc_size);
931                         if (!mc)
932                                 break;
933                         curr_mc_size = mc_size;
934                 }
935 
936                 if (get_ucode_data(mc, ucode_ptr, mc_size) ||
937                     microcode_sanity_check(mc, 1) < 0) {
938                         break;
939                 }
940 
941                 csig = uci->cpu_sig.sig;
942                 cpf = uci->cpu_sig.pf;
943                 if (has_newer_microcode(mc, csig, cpf, new_rev)) {
944                         vfree(new_mc);
945                         new_rev = mc_header.rev;
946                         new_mc  = mc;
947                         mc = NULL;      /* trigger new vmalloc */
948                 }
949 
950                 ucode_ptr += mc_size;
951                 leftover  -= mc_size;
952         }
953 
954         vfree(mc);
955 
956         if (leftover) {
957                 vfree(new_mc);
958                 state = UCODE_ERROR;
959                 goto out;
960         }
961 
962         if (!new_mc) {
963                 state = UCODE_NFOUND;
964                 goto out;
965         }
966 
967         vfree(uci->mc);
968         uci->mc = (struct microcode_intel *)new_mc;
969 
970         /*
971          * If early loading microcode is supported, save this mc into
972          * permanent memory. So it will be loaded early when a CPU is hot added
973          * or resumes.
974          */
975         save_mc_for_early(new_mc);
976 
977         pr_debug("CPU%d found a matching microcode update with version 0x%x (current=0x%x)\n",
978                  cpu, new_rev, uci->cpu_sig.rev);
979 out:
980         return state;
981 }
982 
983 static int get_ucode_fw(void *to, const void *from, size_t n)
984 {
985         memcpy(to, from, n);
986         return 0;
987 }
988 
989 static enum ucode_state request_microcode_fw(int cpu, struct device *device,
990                                              bool refresh_fw)
991 {
992         char name[30];
993         struct cpuinfo_x86 *c = &cpu_data(cpu);
994         const struct firmware *firmware;
995         enum ucode_state ret;
996 
997         sprintf(name, "intel-ucode/%02x-%02x-%02x",
998                 c->x86, c->x86_model, c->x86_mask);
999 
1000         if (request_firmware_direct(&firmware, name, device)) {
1001                 pr_debug("data file %s load failed\n", name);
1002                 return UCODE_NFOUND;
1003         }
1004 
1005         ret = generic_load_microcode(cpu, (void *)firmware->data,
1006                                      firmware->size, &get_ucode_fw);
1007 
1008         release_firmware(firmware);
1009 
1010         return ret;
1011 }
1012 
1013 static int get_ucode_user(void *to, const void *from, size_t n)
1014 {
1015         return copy_from_user(to, from, n);
1016 }
1017 
1018 static enum ucode_state
1019 request_microcode_user(int cpu, const void __user *buf, size_t size)
1020 {
1021         return generic_load_microcode(cpu, (void *)buf, size, &get_ucode_user);
1022 }
1023 
1024 static void microcode_fini_cpu(int cpu)
1025 {
1026         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
1027 
1028         vfree(uci->mc);
1029         uci->mc = NULL;
1030 }
1031 
1032 static struct microcode_ops microcode_intel_ops = {
1033         .request_microcode_user           = request_microcode_user,
1034         .request_microcode_fw             = request_microcode_fw,
1035         .collect_cpu_info                 = collect_cpu_info,
1036         .apply_microcode                  = apply_microcode_intel,
1037         .microcode_fini_cpu               = microcode_fini_cpu,
1038 };
1039 
1040 struct microcode_ops * __init init_intel_microcode(void)
1041 {
1042         struct cpuinfo_x86 *c = &boot_cpu_data;
1043 
1044         if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
1045             cpu_has(c, X86_FEATURE_IA64)) {
1046                 pr_err("Intel CPU family 0x%x not supported\n", c->x86);
1047                 return NULL;
1048         }
1049 
1050         return &microcode_intel_ops;
1051 }
1052 
1053 

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