2 * Intel CPU Microcode Update Driver for Linux
4 * Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
5 * 2006 Shaohua Li <shaohua.li@intel.com>
7 * Intel CPU microcode early update for Linux
9 * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
10 * H Peter Anvin" <hpa@zytor.com>
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.
19 * This needs to be before all headers so that pr_debug in printk.h doesn't turn
20 * printk calls into no_printk().
24 #define pr_fmt(fmt) "microcode: " fmt
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>
36 #include <asm/microcode_intel.h>
37 #include <asm/processor.h>
38 #include <asm/tlbflush.h>
39 #include <asm/setup.h>
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;
48 static enum ucode_state
49 load_microcode_early(struct microcode_intel **saved,
50 unsigned int num_saved, struct ucode_cpu_info *uci)
52 struct microcode_intel *ucode_ptr, *new_mc = NULL;
53 struct microcode_header_intel *mc_hdr;
56 new_rev = uci->cpu_sig.rev;
58 for (i = 0; i < num_saved; i++) {
60 mc_hdr = (struct microcode_header_intel *)ucode_ptr;
62 ret = has_newer_microcode(ucode_ptr,
69 new_rev = mc_hdr->rev;
76 uci->mc = (struct microcode_intel *)new_mc;
81 copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd,
82 unsigned long off, int num_saved)
86 for (i = 0; i < num_saved; i++)
87 mc_saved[i] = (struct microcode_intel *)(initrd[i] + off);
92 microcode_phys(struct microcode_intel **mc_saved_tmp,
93 struct mc_saved_data *mc_saved_data)
96 struct microcode_intel ***mc_saved;
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;
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);
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)
114 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
115 unsigned int count = mc_saved_data->mc_saved_count;
117 if (!mc_saved_data->mc_saved) {
118 copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count);
120 return load_microcode_early(mc_saved_tmp, count, uci);
123 microcode_phys(mc_saved_tmp, mc_saved_data);
124 return load_microcode_early(mc_saved_tmp, count, uci);
126 return load_microcode_early(mc_saved_data->mc_saved,
133 * Given CPU signature and a microcode patch, this function finds if the
134 * microcode patch has matching family and model with the CPU.
136 static enum ucode_state
137 matching_model_microcode(struct microcode_header_intel *mc_header,
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);
146 struct extended_signature *ext_sig;
148 fam = x86_family(sig);
149 model = x86_model(sig);
151 fam_ucode = x86_family(mc_header->sig);
152 model_ucode = x86_model(mc_header->sig);
154 if (fam == fam_ucode && model == model_ucode)
157 /* Look for ext. headers: */
158 if (total_size <= data_size + MC_HEADER_SIZE)
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;
165 for (i = 0; i < ext_sigcount; i++) {
166 fam_ucode = x86_family(ext_sig->sig);
167 model_ucode = x86_model(ext_sig->sig);
169 if (fam == fam_ucode && model == model_ucode)
178 save_microcode(struct mc_saved_data *mc_saved_data,
179 struct microcode_intel **mc_saved_src,
180 unsigned int mc_saved_count)
183 struct microcode_intel **saved_ptr;
190 * Copy new microcode data.
192 saved_ptr = kcalloc(mc_saved_count, sizeof(struct microcode_intel *), GFP_KERNEL);
196 for (i = 0; i < mc_saved_count; i++) {
197 struct microcode_header_intel *mc_hdr;
198 struct microcode_intel *mc;
201 if (!mc_saved_src[i]) {
206 mc = mc_saved_src[i];
208 size = get_totalsize(mc_hdr);
210 saved_ptr[i] = kmalloc(size, GFP_KERNEL);
216 memcpy(saved_ptr[i], mc, size);
220 * Point to newly saved microcode.
222 mc_saved_data->mc_saved = saved_ptr;
223 mc_saved_data->mc_saved_count = mc_saved_count;
228 for (j = 0; j <= i; j++)
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
239 * - or if it is a newly discovered microcode patch.
241 * The microcode patch should have matching model with CPU.
243 * Returns: The updated number @num_saved of saved microcode patches.
245 static unsigned int _save_mc(struct microcode_intel **mc_saved,
246 u8 *ucode_ptr, unsigned int num_saved)
248 struct microcode_header_intel *mc_hdr, *mc_saved_hdr;
249 unsigned int sig, pf;
252 mc_hdr = (struct microcode_header_intel *)ucode_ptr;
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;
259 if (!find_matching_signature(ucode_ptr, sig, pf))
264 if (mc_hdr->rev <= mc_saved_hdr->rev)
268 * Found an older ucode saved earlier. Replace it with
271 mc_saved[i] = (struct microcode_intel *)ucode_ptr;
275 /* Newly detected microcode, save it to memory. */
276 if (i >= num_saved && !found)
277 mc_saved[num_saved++] = (struct microcode_intel *)ucode_ptr;
283 * Get microcode matching with BSP's model. Only CPUs with the same model as
284 * BSP can stay in the platform.
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)
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;
302 while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) {
304 if (leftover < sizeof(mc_header))
307 mc_header = (struct microcode_header_intel *)ucode_ptr;
309 mc_size = get_totalsize(mc_header);
310 if (!mc_size || mc_size > leftover ||
311 microcode_sanity_check(ucode_ptr, 0) < 0)
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.
321 if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
323 ucode_ptr += mc_size;
327 mc_saved_count = _save_mc(mc_saved_tmp, ucode_ptr, mc_saved_count);
329 ucode_ptr += mc_size;
337 if (mc_saved_count == 0) {
338 state = UCODE_NFOUND;
342 for (i = 0; i < mc_saved_count; i++)
343 mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
345 mc_saved_data->mc_saved_count = mc_saved_count;
350 static int collect_cpu_info_early(struct ucode_cpu_info *uci)
353 unsigned int family, model;
354 struct cpu_signature csig;
355 unsigned int eax, ebx, ecx, edx;
361 memset(uci, 0, sizeof(*uci));
365 native_cpuid(&eax, &ebx, &ecx, &edx);
368 family = x86_family(csig.sig);
369 model = x86_model(csig.sig);
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);
376 native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
378 /* As documented in the SDM: Do a CPUID 1 here */
381 /* get the current revision from MSR 0x8B */
382 native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
392 static void show_saved_mc(void)
396 unsigned int sig, pf, rev, total_size, data_size, date;
397 struct ucode_cpu_info uci;
399 if (mc_saved_data.mc_saved_count == 0) {
400 pr_debug("no microcode data saved.\n");
403 pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count);
405 collect_cpu_info_early(&uci);
407 sig = uci.cpu_sig.sig;
409 rev = uci.cpu_sig.rev;
410 pr_debug("CPU: sig=0x%x, pf=0x%x, rev=0x%x\n", sig, pf, rev);
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;
416 struct extended_signature *ext_sig;
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;
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,
431 (date >> 16) & 0xff);
433 /* Look for ext. headers: */
434 if (total_size <= data_size + MC_HEADER_SIZE)
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;
441 for (j = 0; j < ext_sigcount; j++) {
445 pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n",
455 #ifdef CONFIG_HOTPLUG_CPU
456 static DEFINE_MUTEX(x86_cpu_microcode_mutex);
458 * Save this mc into mc_saved_data. So it will be loaded early when a CPU is
459 * hot added or resumes.
461 * Please make sure this mc should be a valid microcode patch before calling
464 int save_mc_for_early(u8 *mc)
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;
474 * Hold hotplug lock so mc_saved_data is not accessed by a CPU in
477 mutex_lock(&x86_cpu_microcode_mutex);
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;
483 if (mc_saved && mc_saved_count)
484 memcpy(mc_saved_tmp, mc_saved,
485 mc_saved_count * sizeof(struct microcode_intel *));
487 * Save the microcode patch mc in mc_save_tmp structure if it's a newer
490 mc_saved_count = _save_mc(mc_saved_tmp, mc, mc_saved_count);
493 * Save the mc_save_tmp in global mc_saved_data.
495 ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count);
497 pr_err("Cannot save microcode patch.\n");
504 * Free old saved microcode data.
507 for (i = 0; i < mc_saved_count_init; i++)
513 mutex_unlock(&x86_cpu_microcode_mutex);
517 EXPORT_SYMBOL_GPL(save_mc_for_early);
520 static bool __init load_builtin_intel_microcode(struct cpio_data *cp)
523 unsigned int eax = 0x00000001, ebx, ecx = 0, edx;
526 native_cpuid(&eax, &ebx, &ecx, &edx);
528 sprintf(name, "intel-ucode/%02x-%02x-%02x",
529 x86_family(eax), x86_model(eax), x86_stepping(eax));
531 return get_builtin_firmware(cp, name);
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)
546 char *p = (char *)__pa_nodebug(ucode_name);
548 char *p = ucode_name;
554 /* try built-in microcode if no initrd */
556 if (!load_builtin_intel_microcode(&cd))
559 cd = find_cpio_data(p, (void *)start, size, &offset);
564 return get_matching_model_microcode(0, start, cd.data, cd.size,
565 mc_saved_data, initrd, uci);
569 * Print ucode update info.
572 print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
574 int cpu = smp_processor_id();
576 pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
581 (date >> 16) & 0xff);
586 static int delay_ucode_info;
587 static int current_mc_date;
590 * Print early updated ucode info after printk works. This is delayed info dump.
592 void show_ucode_info_early(void)
594 struct ucode_cpu_info uci;
596 if (delay_ucode_info) {
597 collect_cpu_info_early(&uci);
598 print_ucode_info(&uci, current_mc_date);
599 delay_ucode_info = 0;
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.
608 static void print_ucode(struct ucode_cpu_info *uci)
610 struct microcode_intel *mc_intel;
611 int *delay_ucode_info_p;
612 int *current_mc_date_p;
615 if (mc_intel == NULL)
618 delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info);
619 current_mc_date_p = (int *)__pa_nodebug(¤t_mc_date);
621 *delay_ucode_info_p = 1;
622 *current_mc_date_p = mc_intel->hdr.date;
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.
630 static inline void flush_tlb_early(void)
632 __native_flush_tlb_global_irq_disabled();
635 static inline void print_ucode(struct ucode_cpu_info *uci)
637 struct microcode_intel *mc_intel;
640 if (mc_intel == NULL)
643 print_ucode_info(uci, mc_intel->hdr.date);
647 static int apply_microcode_early(struct ucode_cpu_info *uci, bool early)
649 struct microcode_intel *mc_intel;
653 if (mc_intel == NULL)
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);
662 /* As documented in the SDM: Do a CPUID 1 here */
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)
671 /* Flush global tlb. This is precaution. */
674 uci->cpu_sig.rev = val[1];
679 print_ucode_info(uci, mc_intel->hdr.date);
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.
688 int __init save_microcode_in_initrd_intel(void)
690 unsigned int count = mc_saved_data.mc_saved_count;
691 struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
697 copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, get_initrd_start(), count);
698 ret = save_microcode(&mc_saved_data, mc_saved, count);
700 pr_err("Cannot save microcode patches from initrd.\n");
708 _load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
709 unsigned long *initrd,
710 unsigned long start, unsigned long size)
712 struct ucode_cpu_info uci;
713 enum ucode_state ret;
715 collect_cpu_info_early(&uci);
717 ret = scan_microcode(mc_saved_data, initrd, start, size, &uci);
721 ret = load_microcode(mc_saved_data, initrd, start, &uci);
725 apply_microcode_early(&uci, true);
728 void __init load_ucode_intel_bsp(void)
732 struct boot_params *p;
734 p = (struct boot_params *)__pa_nodebug(&boot_params);
735 size = p->hdr.ramdisk_size;
738 * Set start only if we have an initrd image. We cannot use initrd_start
739 * because it is not set that early yet.
741 start = (size ? p->hdr.ramdisk_image : 0);
743 _load_ucode_intel_bsp((struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
744 (unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
747 size = boot_params.hdr.ramdisk_size;
748 start = (size ? boot_params.hdr.ramdisk_image + PAGE_OFFSET : 0);
750 _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
754 void load_ucode_intel_ap(void)
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;
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);
765 mc_saved_in_initrd_p = mc_saved_in_initrd;
766 mc_saved_data_p = &mc_saved_data;
770 * If there is no valid ucode previously saved in memory, no need to
771 * update ucode on this AP.
773 if (mc_saved_data_p->mc_saved_count == 0)
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);
783 apply_microcode_early(&uci, true);
786 void reload_ucode_intel(void)
788 struct ucode_cpu_info uci;
789 enum ucode_state ret;
791 if (!mc_saved_data.mc_saved_count)
794 collect_cpu_info_early(&uci);
796 ret = load_microcode_early(mc_saved_data.mc_saved,
797 mc_saved_data.mc_saved_count, &uci);
801 apply_microcode_early(&uci, false);
804 static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
806 struct cpuinfo_x86 *c = &cpu_data(cpu_num);
809 memset(csig, 0, sizeof(*csig));
811 csig->sig = cpuid_eax(0x00000001);
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);
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);
827 * return 0 - no update found
828 * return 1 - found update
830 static int get_matching_mc(struct microcode_intel *mc_intel, int cpu)
832 struct cpu_signature cpu_sig;
833 unsigned int csig, cpf, crev;
835 collect_cpu_info(cpu, &cpu_sig);
841 return has_newer_microcode(mc_intel, csig, cpf, crev);
844 static int apply_microcode_intel(int cpu)
846 struct microcode_intel *mc_intel;
847 struct ucode_cpu_info *uci;
849 int cpu_num = raw_smp_processor_id();
850 struct cpuinfo_x86 *c = &cpu_data(cpu_num);
852 uci = ucode_cpu_info + cpu;
855 /* We should bind the task to the CPU */
856 BUG_ON(cpu_num != cpu);
858 if (mc_intel == NULL)
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
866 if (get_matching_mc(mc_intel, cpu) == 0)
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);
875 /* As documented in the SDM: Do a CPUID 1 here */
878 /* get the current revision from MSR 0x8B */
879 rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
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);
886 pr_info("CPU%d updated to revision 0x%x, date = %04x-%02x-%02x\n",
888 mc_intel->hdr.date & 0xffff,
889 mc_intel->hdr.date >> 24,
890 (mc_intel->hdr.date >> 16) & 0xff);
892 uci->cpu_sig.rev = val[1];
893 c->microcode = val[1];
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))
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;
910 struct microcode_header_intel mc_header;
911 unsigned int mc_size;
913 if (leftover < sizeof(mc_header)) {
914 pr_err("error! Truncated header in microcode data file\n");
918 if (get_ucode_data(&mc_header, ucode_ptr, sizeof(mc_header)))
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");
927 /* For performance reasons, reuse mc area when possible */
928 if (!mc || mc_size > curr_mc_size) {
930 mc = vmalloc(mc_size);
933 curr_mc_size = mc_size;
936 if (get_ucode_data(mc, ucode_ptr, mc_size) ||
937 microcode_sanity_check(mc, 1) < 0) {
941 csig = uci->cpu_sig.sig;
942 cpf = uci->cpu_sig.pf;
943 if (has_newer_microcode(mc, csig, cpf, new_rev)) {
945 new_rev = mc_header.rev;
947 mc = NULL; /* trigger new vmalloc */
950 ucode_ptr += mc_size;
963 state = UCODE_NFOUND;
968 uci->mc = (struct microcode_intel *)new_mc;
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
975 save_mc_for_early(new_mc);
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);
983 static int get_ucode_fw(void *to, const void *from, size_t n)
989 static enum ucode_state request_microcode_fw(int cpu, struct device *device,
993 struct cpuinfo_x86 *c = &cpu_data(cpu);
994 const struct firmware *firmware;
995 enum ucode_state ret;
997 sprintf(name, "intel-ucode/%02x-%02x-%02x",
998 c->x86, c->x86_model, c->x86_mask);
1000 if (request_firmware_direct(&firmware, name, device)) {
1001 pr_debug("data file %s load failed\n", name);
1002 return UCODE_NFOUND;
1005 ret = generic_load_microcode(cpu, (void *)firmware->data,
1006 firmware->size, &get_ucode_fw);
1008 release_firmware(firmware);
1013 static int get_ucode_user(void *to, const void *from, size_t n)
1015 return copy_from_user(to, from, n);
1018 static enum ucode_state
1019 request_microcode_user(int cpu, const void __user *buf, size_t size)
1021 return generic_load_microcode(cpu, (void *)buf, size, &get_ucode_user);
1024 static void microcode_fini_cpu(int cpu)
1026 struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
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,
1040 struct microcode_ops * __init init_intel_microcode(void)
1042 struct cpuinfo_x86 *c = &boot_cpu_data;
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);
1050 return µcode_intel_ops;