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13
14#undef DEBUG
15#define pr_fmt(fmt) "fadump: " fmt
16
17#include <linux/string.h>
18#include <linux/memblock.h>
19#include <linux/delay.h>
20#include <linux/seq_file.h>
21#include <linux/crash_dump.h>
22#include <linux/kobject.h>
23#include <linux/sysfs.h>
24#include <linux/slab.h>
25#include <linux/cma.h>
26#include <linux/hugetlb.h>
27#include <linux/debugfs.h>
28
29#include <asm/page.h>
30#include <asm/prom.h>
31#include <asm/fadump.h>
32#include <asm/fadump-internal.h>
33#include <asm/setup.h>
34#include <asm/interrupt.h>
35
36
37
38
39
40
41
42#define CRASH_TIMEOUT 500
43
44static struct fw_dump fw_dump;
45
46static void __init fadump_reserve_crash_area(u64 base);
47
48#ifndef CONFIG_PRESERVE_FA_DUMP
49
50static struct kobject *fadump_kobj;
51
52static atomic_t cpus_in_fadump;
53static DEFINE_MUTEX(fadump_mutex);
54
55static struct fadump_mrange_info crash_mrange_info = { "crash", NULL, 0, 0, 0, false };
56
57#define RESERVED_RNGS_SZ 16384
58#define RESERVED_RNGS_CNT (RESERVED_RNGS_SZ / \
59 sizeof(struct fadump_memory_range))
60static struct fadump_memory_range rngs[RESERVED_RNGS_CNT];
61static struct fadump_mrange_info
62reserved_mrange_info = { "reserved", rngs, RESERVED_RNGS_SZ, 0, RESERVED_RNGS_CNT, true };
63
64static void __init early_init_dt_scan_reserved_ranges(unsigned long node);
65
66#ifdef CONFIG_CMA
67static struct cma *fadump_cma;
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82static int __init fadump_cma_init(void)
83{
84 unsigned long long base, size;
85 int rc;
86
87 if (!fw_dump.fadump_enabled)
88 return 0;
89
90
91
92
93
94 if (fw_dump.nocma)
95 return 1;
96
97 base = fw_dump.reserve_dump_area_start;
98 size = fw_dump.boot_memory_size;
99
100 if (!size)
101 return 0;
102
103 rc = cma_init_reserved_mem(base, size, 0, "fadump_cma", &fadump_cma);
104 if (rc) {
105 pr_err("Failed to init cma area for firmware-assisted dump,%d\n", rc);
106
107
108
109
110
111
112 return 1;
113 }
114
115
116
117
118 pr_info("Initialized 0x%lx bytes cma area at %ldMB from 0x%lx "
119 "bytes of memory reserved for firmware-assisted dump\n",
120 cma_get_size(fadump_cma),
121 (unsigned long)cma_get_base(fadump_cma) >> 20,
122 fw_dump.reserve_dump_area_size);
123 return 1;
124}
125#else
126static int __init fadump_cma_init(void) { return 1; }
127#endif
128
129
130int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname,
131 int depth, void *data)
132{
133 if (depth == 0) {
134 early_init_dt_scan_reserved_ranges(node);
135 return 0;
136 }
137
138 if (depth != 1)
139 return 0;
140
141 if (strcmp(uname, "rtas") == 0) {
142 rtas_fadump_dt_scan(&fw_dump, node);
143 return 1;
144 }
145
146 if (strcmp(uname, "ibm,opal") == 0) {
147 opal_fadump_dt_scan(&fw_dump, node);
148 return 1;
149 }
150
151 return 0;
152}
153
154
155
156
157
158int is_fadump_memory_area(u64 addr, unsigned long size)
159{
160 u64 d_start, d_end;
161
162 if (!fw_dump.dump_registered)
163 return 0;
164
165 if (!size)
166 return 0;
167
168 d_start = fw_dump.reserve_dump_area_start;
169 d_end = d_start + fw_dump.reserve_dump_area_size;
170 if (((addr + size) > d_start) && (addr <= d_end))
171 return 1;
172
173 return (addr <= fw_dump.boot_mem_top);
174}
175
176int should_fadump_crash(void)
177{
178 if (!fw_dump.dump_registered || !fw_dump.fadumphdr_addr)
179 return 0;
180 return 1;
181}
182
183int is_fadump_active(void)
184{
185 return fw_dump.dump_active;
186}
187
188
189
190
191
192static bool is_fadump_mem_area_contiguous(u64 d_start, u64 d_end)
193{
194 phys_addr_t reg_start, reg_end;
195 bool ret = false;
196 u64 i, start, end;
197
198 for_each_mem_range(i, ®_start, ®_end) {
199 start = max_t(u64, d_start, reg_start);
200 end = min_t(u64, d_end, reg_end);
201 if (d_start < end) {
202
203 if (start > d_start)
204 break;
205
206 if (end == d_end) {
207 ret = true;
208 break;
209 }
210
211 d_start = end + 1;
212 }
213 }
214
215 return ret;
216}
217
218
219
220
221
222bool is_fadump_boot_mem_contiguous(void)
223{
224 unsigned long d_start, d_end;
225 bool ret = false;
226 int i;
227
228 for (i = 0; i < fw_dump.boot_mem_regs_cnt; i++) {
229 d_start = fw_dump.boot_mem_addr[i];
230 d_end = d_start + fw_dump.boot_mem_sz[i];
231
232 ret = is_fadump_mem_area_contiguous(d_start, d_end);
233 if (!ret)
234 break;
235 }
236
237 return ret;
238}
239
240
241
242
243
244bool is_fadump_reserved_mem_contiguous(void)
245{
246 u64 d_start, d_end;
247
248 d_start = fw_dump.reserve_dump_area_start;
249 d_end = d_start + fw_dump.reserve_dump_area_size;
250 return is_fadump_mem_area_contiguous(d_start, d_end);
251}
252
253
254static void fadump_show_config(void)
255{
256 int i;
257
258 pr_debug("Support for firmware-assisted dump (fadump): %s\n",
259 (fw_dump.fadump_supported ? "present" : "no support"));
260
261 if (!fw_dump.fadump_supported)
262 return;
263
264 pr_debug("Fadump enabled : %s\n",
265 (fw_dump.fadump_enabled ? "yes" : "no"));
266 pr_debug("Dump Active : %s\n",
267 (fw_dump.dump_active ? "yes" : "no"));
268 pr_debug("Dump section sizes:\n");
269 pr_debug(" CPU state data size: %lx\n", fw_dump.cpu_state_data_size);
270 pr_debug(" HPTE region size : %lx\n", fw_dump.hpte_region_size);
271 pr_debug(" Boot memory size : %lx\n", fw_dump.boot_memory_size);
272 pr_debug(" Boot memory top : %llx\n", fw_dump.boot_mem_top);
273 pr_debug("Boot memory regions cnt: %llx\n", fw_dump.boot_mem_regs_cnt);
274 for (i = 0; i < fw_dump.boot_mem_regs_cnt; i++) {
275 pr_debug("[%03d] base = %llx, size = %llx\n", i,
276 fw_dump.boot_mem_addr[i], fw_dump.boot_mem_sz[i]);
277 }
278}
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295static __init u64 fadump_calculate_reserve_size(void)
296{
297 u64 base, size, bootmem_min;
298 int ret;
299
300 if (fw_dump.reserve_bootvar)
301 pr_warn("'fadump_reserve_mem=' parameter is deprecated in favor of 'crashkernel=' parameter.\n");
302
303
304
305
306
307
308 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
309 &size, &base);
310 if (ret == 0 && size > 0) {
311 unsigned long max_size;
312
313 if (fw_dump.reserve_bootvar)
314 pr_info("Using 'crashkernel=' parameter for memory reservation.\n");
315
316 fw_dump.reserve_bootvar = (unsigned long)size;
317
318
319
320
321
322 max_size = memblock_phys_mem_size() / MAX_BOOT_MEM_RATIO;
323 if (fw_dump.reserve_bootvar > max_size) {
324 fw_dump.reserve_bootvar = max_size;
325 pr_info("Adjusted boot memory size to %luMB\n",
326 (fw_dump.reserve_bootvar >> 20));
327 }
328
329 return fw_dump.reserve_bootvar;
330 } else if (fw_dump.reserve_bootvar) {
331
332
333
334
335 return fw_dump.reserve_bootvar;
336 }
337
338
339 size = memblock_phys_mem_size() / 20;
340
341
342 size = size & ~0x0FFFFFFFUL;
343
344
345 if (memory_limit && size > memory_limit)
346 size = memory_limit;
347
348 bootmem_min = fw_dump.ops->fadump_get_bootmem_min();
349 return (size > bootmem_min ? size : bootmem_min);
350}
351
352
353
354
355
356static unsigned long get_fadump_area_size(void)
357{
358 unsigned long size = 0;
359
360 size += fw_dump.cpu_state_data_size;
361 size += fw_dump.hpte_region_size;
362 size += fw_dump.boot_memory_size;
363 size += sizeof(struct fadump_crash_info_header);
364 size += sizeof(struct elfhdr);
365 size += sizeof(struct elf_phdr);
366
367 size += sizeof(struct elf_phdr) * (memblock_num_regions(memory) + 2);
368
369 size = PAGE_ALIGN(size);
370
371
372 size += (fw_dump.ops->fadump_get_metadata_size ?
373 fw_dump.ops->fadump_get_metadata_size() : 0);
374 return size;
375}
376
377static int __init add_boot_mem_region(unsigned long rstart,
378 unsigned long rsize)
379{
380 int i = fw_dump.boot_mem_regs_cnt++;
381
382 if (fw_dump.boot_mem_regs_cnt > FADUMP_MAX_MEM_REGS) {
383 fw_dump.boot_mem_regs_cnt = FADUMP_MAX_MEM_REGS;
384 return 0;
385 }
386
387 pr_debug("Added boot memory range[%d] [%#016lx-%#016lx)\n",
388 i, rstart, (rstart + rsize));
389 fw_dump.boot_mem_addr[i] = rstart;
390 fw_dump.boot_mem_sz[i] = rsize;
391 return 1;
392}
393
394
395
396
397
398static int __init add_boot_mem_regions(unsigned long mstart,
399 unsigned long msize)
400{
401 unsigned long rstart, rsize, max_size;
402 int ret = 1;
403
404 rstart = mstart;
405 max_size = fw_dump.max_copy_size ? fw_dump.max_copy_size : msize;
406 while (msize) {
407 if (msize > max_size)
408 rsize = max_size;
409 else
410 rsize = msize;
411
412 ret = add_boot_mem_region(rstart, rsize);
413 if (!ret)
414 break;
415
416 msize -= rsize;
417 rstart += rsize;
418 }
419
420 return ret;
421}
422
423static int __init fadump_get_boot_mem_regions(void)
424{
425 unsigned long size, cur_size, hole_size, last_end;
426 unsigned long mem_size = fw_dump.boot_memory_size;
427 phys_addr_t reg_start, reg_end;
428 int ret = 1;
429 u64 i;
430
431 fw_dump.boot_mem_regs_cnt = 0;
432
433 last_end = 0;
434 hole_size = 0;
435 cur_size = 0;
436 for_each_mem_range(i, ®_start, ®_end) {
437 size = reg_end - reg_start;
438 hole_size += (reg_start - last_end);
439
440 if ((cur_size + size) >= mem_size) {
441 size = (mem_size - cur_size);
442 ret = add_boot_mem_regions(reg_start, size);
443 break;
444 }
445
446 mem_size -= size;
447 cur_size += size;
448 ret = add_boot_mem_regions(reg_start, size);
449 if (!ret)
450 break;
451
452 last_end = reg_end;
453 }
454 fw_dump.boot_mem_top = PAGE_ALIGN(fw_dump.boot_memory_size + hole_size);
455
456 return ret;
457}
458
459
460
461
462
463
464
465static bool overlaps_reserved_ranges(u64 base, u64 end, int *idx)
466{
467 bool ret = false;
468 int i;
469
470 for (i = *idx; i < reserved_mrange_info.mem_range_cnt; i++) {
471 u64 rbase = reserved_mrange_info.mem_ranges[i].base;
472 u64 rend = rbase + reserved_mrange_info.mem_ranges[i].size;
473
474 if (end <= rbase)
475 break;
476
477 if ((end > rbase) && (base < rend)) {
478 *idx = i;
479 ret = true;
480 break;
481 }
482 }
483
484 return ret;
485}
486
487
488
489
490
491static u64 __init fadump_locate_reserve_mem(u64 base, u64 size)
492{
493 struct fadump_memory_range *mrngs;
494 phys_addr_t mstart, mend;
495 int idx = 0;
496 u64 i, ret = 0;
497
498 mrngs = reserved_mrange_info.mem_ranges;
499 for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE,
500 &mstart, &mend, NULL) {
501 pr_debug("%llu) mstart: %llx, mend: %llx, base: %llx\n",
502 i, mstart, mend, base);
503
504 if (mstart > base)
505 base = PAGE_ALIGN(mstart);
506
507 while ((mend > base) && ((mend - base) >= size)) {
508 if (!overlaps_reserved_ranges(base, base+size, &idx)) {
509 ret = base;
510 goto out;
511 }
512
513 base = mrngs[idx].base + mrngs[idx].size;
514 base = PAGE_ALIGN(base);
515 }
516 }
517
518out:
519 return ret;
520}
521
522int __init fadump_reserve_mem(void)
523{
524 u64 base, size, mem_boundary, bootmem_min;
525 int ret = 1;
526
527 if (!fw_dump.fadump_enabled)
528 return 0;
529
530 if (!fw_dump.fadump_supported) {
531 pr_info("Firmware-Assisted Dump is not supported on this hardware\n");
532 goto error_out;
533 }
534
535
536
537
538
539
540 if (!fw_dump.dump_active) {
541 fw_dump.boot_memory_size =
542 PAGE_ALIGN(fadump_calculate_reserve_size());
543#ifdef CONFIG_CMA
544 if (!fw_dump.nocma) {
545 fw_dump.boot_memory_size =
546 ALIGN(fw_dump.boot_memory_size,
547 FADUMP_CMA_ALIGNMENT);
548 }
549#endif
550
551 bootmem_min = fw_dump.ops->fadump_get_bootmem_min();
552 if (fw_dump.boot_memory_size < bootmem_min) {
553 pr_err("Can't enable fadump with boot memory size (0x%lx) less than 0x%llx\n",
554 fw_dump.boot_memory_size, bootmem_min);
555 goto error_out;
556 }
557
558 if (!fadump_get_boot_mem_regions()) {
559 pr_err("Too many holes in boot memory area to enable fadump\n");
560 goto error_out;
561 }
562 }
563
564
565
566
567
568
569
570
571 if (memory_limit && memory_limit < memblock_end_of_DRAM()) {
572 size = get_fadump_area_size();
573 if ((memory_limit + size) < memblock_end_of_DRAM())
574 memory_limit += size;
575 else
576 memory_limit = memblock_end_of_DRAM();
577 printk(KERN_INFO "Adjusted memory_limit for firmware-assisted"
578 " dump, now %#016llx\n", memory_limit);
579 }
580 if (memory_limit)
581 mem_boundary = memory_limit;
582 else
583 mem_boundary = memblock_end_of_DRAM();
584
585 base = fw_dump.boot_mem_top;
586 size = get_fadump_area_size();
587 fw_dump.reserve_dump_area_size = size;
588 if (fw_dump.dump_active) {
589 pr_info("Firmware-assisted dump is active.\n");
590
591#ifdef CONFIG_HUGETLB_PAGE
592
593
594
595
596
597 hugetlb_disabled = true;
598#endif
599
600
601
602
603
604
605 fadump_reserve_crash_area(base);
606
607 pr_debug("fadumphdr_addr = %#016lx\n", fw_dump.fadumphdr_addr);
608 pr_debug("Reserve dump area start address: 0x%lx\n",
609 fw_dump.reserve_dump_area_start);
610 } else {
611
612
613
614
615 base = fadump_locate_reserve_mem(base, size);
616
617 if (!base || (base + size > mem_boundary)) {
618 pr_err("Failed to find memory chunk for reservation!\n");
619 goto error_out;
620 }
621 fw_dump.reserve_dump_area_start = base;
622
623
624
625
626
627 if (fw_dump.ops->fadump_setup_metadata &&
628 (fw_dump.ops->fadump_setup_metadata(&fw_dump) < 0))
629 goto error_out;
630
631 if (memblock_reserve(base, size)) {
632 pr_err("Failed to reserve memory!\n");
633 goto error_out;
634 }
635
636 pr_info("Reserved %lldMB of memory at %#016llx (System RAM: %lldMB)\n",
637 (size >> 20), base, (memblock_phys_mem_size() >> 20));
638
639 ret = fadump_cma_init();
640 }
641
642 return ret;
643error_out:
644 fw_dump.fadump_enabled = 0;
645 return 0;
646}
647
648
649static int __init early_fadump_param(char *p)
650{
651 if (!p)
652 return 1;
653
654 if (strncmp(p, "on", 2) == 0)
655 fw_dump.fadump_enabled = 1;
656 else if (strncmp(p, "off", 3) == 0)
657 fw_dump.fadump_enabled = 0;
658 else if (strncmp(p, "nocma", 5) == 0) {
659 fw_dump.fadump_enabled = 1;
660 fw_dump.nocma = 1;
661 }
662
663 return 0;
664}
665early_param("fadump", early_fadump_param);
666
667
668
669
670
671
672static int __init early_fadump_reserve_mem(char *p)
673{
674 if (p)
675 fw_dump.reserve_bootvar = memparse(p, &p);
676 return 0;
677}
678early_param("fadump_reserve_mem", early_fadump_reserve_mem);
679
680void crash_fadump(struct pt_regs *regs, const char *str)
681{
682 unsigned int msecs;
683 struct fadump_crash_info_header *fdh = NULL;
684 int old_cpu, this_cpu;
685
686 unsigned int ncpus = num_online_cpus() - 1;
687
688 if (!should_fadump_crash())
689 return;
690
691
692
693
694
695
696
697
698 this_cpu = smp_processor_id();
699 old_cpu = cmpxchg(&crashing_cpu, -1, this_cpu);
700
701 if (old_cpu != -1) {
702 atomic_inc(&cpus_in_fadump);
703
704
705
706
707
708
709
710
711 while (fw_dump.dump_registered)
712 cpu_relax();
713 return;
714 }
715
716 fdh = __va(fw_dump.fadumphdr_addr);
717 fdh->crashing_cpu = crashing_cpu;
718 crash_save_vmcoreinfo();
719
720 if (regs)
721 fdh->regs = *regs;
722 else
723 ppc_save_regs(&fdh->regs);
724
725 fdh->online_mask = *cpu_online_mask;
726
727
728
729
730
731 if (TRAP(&(fdh->regs)) == INTERRUPT_SYSTEM_RESET) {
732 msecs = CRASH_TIMEOUT;
733 while ((atomic_read(&cpus_in_fadump) < ncpus) && (--msecs > 0))
734 mdelay(1);
735 }
736
737 fw_dump.ops->fadump_trigger(fdh, str);
738}
739
740u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs)
741{
742 struct elf_prstatus prstatus;
743
744 memset(&prstatus, 0, sizeof(prstatus));
745
746
747
748
749 elf_core_copy_kernel_regs(&prstatus.pr_reg, regs);
750 buf = append_elf_note(buf, CRASH_CORE_NOTE_NAME, NT_PRSTATUS,
751 &prstatus, sizeof(prstatus));
752 return buf;
753}
754
755void fadump_update_elfcore_header(char *bufp)
756{
757 struct elf_phdr *phdr;
758
759 bufp += sizeof(struct elfhdr);
760
761
762 phdr = (struct elf_phdr *)bufp;
763
764 if (phdr->p_type == PT_NOTE) {
765 phdr->p_paddr = __pa(fw_dump.cpu_notes_buf_vaddr);
766 phdr->p_offset = phdr->p_paddr;
767 phdr->p_filesz = fw_dump.cpu_notes_buf_size;
768 phdr->p_memsz = fw_dump.cpu_notes_buf_size;
769 }
770 return;
771}
772
773static void *fadump_alloc_buffer(unsigned long size)
774{
775 unsigned long count, i;
776 struct page *page;
777 void *vaddr;
778
779 vaddr = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
780 if (!vaddr)
781 return NULL;
782
783 count = PAGE_ALIGN(size) / PAGE_SIZE;
784 page = virt_to_page(vaddr);
785 for (i = 0; i < count; i++)
786 mark_page_reserved(page + i);
787 return vaddr;
788}
789
790static void fadump_free_buffer(unsigned long vaddr, unsigned long size)
791{
792 free_reserved_area((void *)vaddr, (void *)(vaddr + size), -1, NULL);
793}
794
795s32 fadump_setup_cpu_notes_buf(u32 num_cpus)
796{
797
798 fw_dump.cpu_notes_buf_size = num_cpus * sizeof(note_buf_t);
799 fw_dump.cpu_notes_buf_size = PAGE_ALIGN(fw_dump.cpu_notes_buf_size);
800 fw_dump.cpu_notes_buf_vaddr =
801 (unsigned long)fadump_alloc_buffer(fw_dump.cpu_notes_buf_size);
802 if (!fw_dump.cpu_notes_buf_vaddr) {
803 pr_err("Failed to allocate %ld bytes for CPU notes buffer\n",
804 fw_dump.cpu_notes_buf_size);
805 return -ENOMEM;
806 }
807
808 pr_debug("Allocated buffer for cpu notes of size %ld at 0x%lx\n",
809 fw_dump.cpu_notes_buf_size,
810 fw_dump.cpu_notes_buf_vaddr);
811 return 0;
812}
813
814void fadump_free_cpu_notes_buf(void)
815{
816 if (!fw_dump.cpu_notes_buf_vaddr)
817 return;
818
819 fadump_free_buffer(fw_dump.cpu_notes_buf_vaddr,
820 fw_dump.cpu_notes_buf_size);
821 fw_dump.cpu_notes_buf_vaddr = 0;
822 fw_dump.cpu_notes_buf_size = 0;
823}
824
825static void fadump_free_mem_ranges(struct fadump_mrange_info *mrange_info)
826{
827 if (mrange_info->is_static) {
828 mrange_info->mem_range_cnt = 0;
829 return;
830 }
831
832 kfree(mrange_info->mem_ranges);
833 memset((void *)((u64)mrange_info + RNG_NAME_SZ), 0,
834 (sizeof(struct fadump_mrange_info) - RNG_NAME_SZ));
835}
836
837
838
839
840
841static int fadump_alloc_mem_ranges(struct fadump_mrange_info *mrange_info)
842{
843 struct fadump_memory_range *new_array;
844 u64 new_size;
845
846 new_size = mrange_info->mem_ranges_sz + PAGE_SIZE;
847 pr_debug("Allocating %llu bytes of memory for %s memory ranges\n",
848 new_size, mrange_info->name);
849
850 new_array = krealloc(mrange_info->mem_ranges, new_size, GFP_KERNEL);
851 if (new_array == NULL) {
852 pr_err("Insufficient memory for setting up %s memory ranges\n",
853 mrange_info->name);
854 fadump_free_mem_ranges(mrange_info);
855 return -ENOMEM;
856 }
857
858 mrange_info->mem_ranges = new_array;
859 mrange_info->mem_ranges_sz = new_size;
860 mrange_info->max_mem_ranges = (new_size /
861 sizeof(struct fadump_memory_range));
862 return 0;
863}
864
865static inline int fadump_add_mem_range(struct fadump_mrange_info *mrange_info,
866 u64 base, u64 end)
867{
868 struct fadump_memory_range *mem_ranges = mrange_info->mem_ranges;
869 bool is_adjacent = false;
870 u64 start, size;
871
872 if (base == end)
873 return 0;
874
875
876
877
878
879 if (mrange_info->mem_range_cnt) {
880 start = mem_ranges[mrange_info->mem_range_cnt - 1].base;
881 size = mem_ranges[mrange_info->mem_range_cnt - 1].size;
882
883 if ((start + size) == base)
884 is_adjacent = true;
885 }
886 if (!is_adjacent) {
887
888 if (mrange_info->mem_range_cnt == mrange_info->max_mem_ranges) {
889 int ret;
890
891 if (mrange_info->is_static) {
892 pr_err("Reached array size limit for %s memory ranges\n",
893 mrange_info->name);
894 return -ENOSPC;
895 }
896
897 ret = fadump_alloc_mem_ranges(mrange_info);
898 if (ret)
899 return ret;
900
901
902 mem_ranges = mrange_info->mem_ranges;
903 }
904
905 start = base;
906 mem_ranges[mrange_info->mem_range_cnt].base = start;
907 mrange_info->mem_range_cnt++;
908 }
909
910 mem_ranges[mrange_info->mem_range_cnt - 1].size = (end - start);
911 pr_debug("%s_memory_range[%d] [%#016llx-%#016llx], %#llx bytes\n",
912 mrange_info->name, (mrange_info->mem_range_cnt - 1),
913 start, end - 1, (end - start));
914 return 0;
915}
916
917static int fadump_exclude_reserved_area(u64 start, u64 end)
918{
919 u64 ra_start, ra_end;
920 int ret = 0;
921
922 ra_start = fw_dump.reserve_dump_area_start;
923 ra_end = ra_start + fw_dump.reserve_dump_area_size;
924
925 if ((ra_start < end) && (ra_end > start)) {
926 if ((start < ra_start) && (end > ra_end)) {
927 ret = fadump_add_mem_range(&crash_mrange_info,
928 start, ra_start);
929 if (ret)
930 return ret;
931
932 ret = fadump_add_mem_range(&crash_mrange_info,
933 ra_end, end);
934 } else if (start < ra_start) {
935 ret = fadump_add_mem_range(&crash_mrange_info,
936 start, ra_start);
937 } else if (ra_end < end) {
938 ret = fadump_add_mem_range(&crash_mrange_info,
939 ra_end, end);
940 }
941 } else
942 ret = fadump_add_mem_range(&crash_mrange_info, start, end);
943
944 return ret;
945}
946
947static int fadump_init_elfcore_header(char *bufp)
948{
949 struct elfhdr *elf;
950
951 elf = (struct elfhdr *) bufp;
952 bufp += sizeof(struct elfhdr);
953 memcpy(elf->e_ident, ELFMAG, SELFMAG);
954 elf->e_ident[EI_CLASS] = ELF_CLASS;
955 elf->e_ident[EI_DATA] = ELF_DATA;
956 elf->e_ident[EI_VERSION] = EV_CURRENT;
957 elf->e_ident[EI_OSABI] = ELF_OSABI;
958 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
959 elf->e_type = ET_CORE;
960 elf->e_machine = ELF_ARCH;
961 elf->e_version = EV_CURRENT;
962 elf->e_entry = 0;
963 elf->e_phoff = sizeof(struct elfhdr);
964 elf->e_shoff = 0;
965#if defined(_CALL_ELF)
966 elf->e_flags = _CALL_ELF;
967#else
968 elf->e_flags = 0;
969#endif
970 elf->e_ehsize = sizeof(struct elfhdr);
971 elf->e_phentsize = sizeof(struct elf_phdr);
972 elf->e_phnum = 0;
973 elf->e_shentsize = 0;
974 elf->e_shnum = 0;
975 elf->e_shstrndx = 0;
976
977 return 0;
978}
979
980
981
982
983
984static int fadump_setup_crash_memory_ranges(void)
985{
986 u64 i, start, end;
987 int ret;
988
989 pr_debug("Setup crash memory ranges.\n");
990 crash_mrange_info.mem_range_cnt = 0;
991
992
993
994
995
996
997 for (i = 0; i < fw_dump.boot_mem_regs_cnt; i++) {
998 start = fw_dump.boot_mem_addr[i];
999 end = start + fw_dump.boot_mem_sz[i];
1000 ret = fadump_add_mem_range(&crash_mrange_info, start, end);
1001 if (ret)
1002 return ret;
1003 }
1004
1005 for_each_mem_range(i, &start, &end) {
1006
1007
1008
1009
1010 if (start < fw_dump.boot_mem_top) {
1011 if (end > fw_dump.boot_mem_top)
1012 start = fw_dump.boot_mem_top;
1013 else
1014 continue;
1015 }
1016
1017
1018 ret = fadump_exclude_reserved_area(start, end);
1019 if (ret)
1020 return ret;
1021 }
1022
1023 return 0;
1024}
1025
1026
1027
1028
1029
1030
1031static inline unsigned long fadump_relocate(unsigned long paddr)
1032{
1033 unsigned long raddr, rstart, rend, rlast, hole_size;
1034 int i;
1035
1036 hole_size = 0;
1037 rlast = 0;
1038 raddr = paddr;
1039 for (i = 0; i < fw_dump.boot_mem_regs_cnt; i++) {
1040 rstart = fw_dump.boot_mem_addr[i];
1041 rend = rstart + fw_dump.boot_mem_sz[i];
1042 hole_size += (rstart - rlast);
1043
1044 if (paddr >= rstart && paddr < rend) {
1045 raddr += fw_dump.boot_mem_dest_addr - hole_size;
1046 break;
1047 }
1048
1049 rlast = rend;
1050 }
1051
1052 pr_debug("vmcoreinfo: paddr = 0x%lx, raddr = 0x%lx\n", paddr, raddr);
1053 return raddr;
1054}
1055
1056static int fadump_create_elfcore_headers(char *bufp)
1057{
1058 unsigned long long raddr, offset;
1059 struct elf_phdr *phdr;
1060 struct elfhdr *elf;
1061 int i, j;
1062
1063 fadump_init_elfcore_header(bufp);
1064 elf = (struct elfhdr *)bufp;
1065 bufp += sizeof(struct elfhdr);
1066
1067
1068
1069
1070
1071
1072
1073
1074 phdr = (struct elf_phdr *)bufp;
1075 bufp += sizeof(struct elf_phdr);
1076 phdr->p_type = PT_NOTE;
1077 phdr->p_flags = 0;
1078 phdr->p_vaddr = 0;
1079 phdr->p_align = 0;
1080
1081 phdr->p_offset = 0;
1082 phdr->p_paddr = 0;
1083 phdr->p_filesz = 0;
1084 phdr->p_memsz = 0;
1085
1086 (elf->e_phnum)++;
1087
1088
1089 phdr = (struct elf_phdr *)bufp;
1090 bufp += sizeof(struct elf_phdr);
1091 phdr->p_type = PT_NOTE;
1092 phdr->p_flags = 0;
1093 phdr->p_vaddr = 0;
1094 phdr->p_align = 0;
1095
1096 phdr->p_paddr = fadump_relocate(paddr_vmcoreinfo_note());
1097 phdr->p_offset = phdr->p_paddr;
1098 phdr->p_memsz = phdr->p_filesz = VMCOREINFO_NOTE_SIZE;
1099
1100
1101 (elf->e_phnum)++;
1102
1103
1104 j = 0;
1105 offset = 0;
1106 raddr = fw_dump.boot_mem_addr[0];
1107 for (i = 0; i < crash_mrange_info.mem_range_cnt; i++) {
1108 u64 mbase, msize;
1109
1110 mbase = crash_mrange_info.mem_ranges[i].base;
1111 msize = crash_mrange_info.mem_ranges[i].size;
1112 if (!msize)
1113 continue;
1114
1115 phdr = (struct elf_phdr *)bufp;
1116 bufp += sizeof(struct elf_phdr);
1117 phdr->p_type = PT_LOAD;
1118 phdr->p_flags = PF_R|PF_W|PF_X;
1119 phdr->p_offset = mbase;
1120
1121 if (mbase == raddr) {
1122
1123
1124
1125
1126
1127 phdr->p_offset = fw_dump.boot_mem_dest_addr + offset;
1128 if (j < (fw_dump.boot_mem_regs_cnt - 1)) {
1129 offset += fw_dump.boot_mem_sz[j];
1130 raddr = fw_dump.boot_mem_addr[++j];
1131 }
1132 }
1133
1134 phdr->p_paddr = mbase;
1135 phdr->p_vaddr = (unsigned long)__va(mbase);
1136 phdr->p_filesz = msize;
1137 phdr->p_memsz = msize;
1138 phdr->p_align = 0;
1139
1140
1141 (elf->e_phnum)++;
1142 }
1143 return 0;
1144}
1145
1146static unsigned long init_fadump_header(unsigned long addr)
1147{
1148 struct fadump_crash_info_header *fdh;
1149
1150 if (!addr)
1151 return 0;
1152
1153 fdh = __va(addr);
1154 addr += sizeof(struct fadump_crash_info_header);
1155
1156 memset(fdh, 0, sizeof(struct fadump_crash_info_header));
1157 fdh->magic_number = FADUMP_CRASH_INFO_MAGIC;
1158 fdh->elfcorehdr_addr = addr;
1159
1160 fdh->crashing_cpu = FADUMP_CPU_UNKNOWN;
1161
1162 return addr;
1163}
1164
1165static int register_fadump(void)
1166{
1167 unsigned long addr;
1168 void *vaddr;
1169 int ret;
1170
1171
1172
1173
1174
1175 if (!fw_dump.reserve_dump_area_size)
1176 return -ENODEV;
1177
1178 ret = fadump_setup_crash_memory_ranges();
1179 if (ret)
1180 return ret;
1181
1182 addr = fw_dump.fadumphdr_addr;
1183
1184
1185 addr = init_fadump_header(addr);
1186 vaddr = __va(addr);
1187
1188 pr_debug("Creating ELF core headers at %#016lx\n", addr);
1189 fadump_create_elfcore_headers(vaddr);
1190
1191
1192 pr_debug("Registering for firmware-assisted kernel dump...\n");
1193 return fw_dump.ops->fadump_register(&fw_dump);
1194}
1195
1196void fadump_cleanup(void)
1197{
1198 if (!fw_dump.fadump_supported)
1199 return;
1200
1201
1202 if (fw_dump.dump_active) {
1203 pr_debug("Invalidating firmware-assisted dump registration\n");
1204 fw_dump.ops->fadump_invalidate(&fw_dump);
1205 } else if (fw_dump.dump_registered) {
1206
1207 fw_dump.ops->fadump_unregister(&fw_dump);
1208 fadump_free_mem_ranges(&crash_mrange_info);
1209 }
1210
1211 if (fw_dump.ops->fadump_cleanup)
1212 fw_dump.ops->fadump_cleanup(&fw_dump);
1213}
1214
1215static void fadump_free_reserved_memory(unsigned long start_pfn,
1216 unsigned long end_pfn)
1217{
1218 unsigned long pfn;
1219 unsigned long time_limit = jiffies + HZ;
1220
1221 pr_info("freeing reserved memory (0x%llx - 0x%llx)\n",
1222 PFN_PHYS(start_pfn), PFN_PHYS(end_pfn));
1223
1224 for (pfn = start_pfn; pfn < end_pfn; pfn++) {
1225 free_reserved_page(pfn_to_page(pfn));
1226
1227 if (time_after(jiffies, time_limit)) {
1228 cond_resched();
1229 time_limit = jiffies + HZ;
1230 }
1231 }
1232}
1233
1234
1235
1236
1237static void fadump_release_reserved_area(u64 start, u64 end)
1238{
1239 unsigned long reg_spfn, reg_epfn;
1240 u64 tstart, tend, spfn, epfn;
1241 int i;
1242
1243 spfn = PHYS_PFN(start);
1244 epfn = PHYS_PFN(end);
1245
1246 for_each_mem_pfn_range(i, MAX_NUMNODES, ®_spfn, ®_epfn, NULL) {
1247 tstart = max_t(u64, spfn, reg_spfn);
1248 tend = min_t(u64, epfn, reg_epfn);
1249
1250 if (tstart < tend) {
1251 fadump_free_reserved_memory(tstart, tend);
1252
1253 if (tend == epfn)
1254 break;
1255
1256 spfn = tend;
1257 }
1258 }
1259}
1260
1261
1262
1263
1264
1265static void sort_and_merge_mem_ranges(struct fadump_mrange_info *mrange_info)
1266{
1267 struct fadump_memory_range *mem_ranges;
1268 struct fadump_memory_range tmp_range;
1269 u64 base, size;
1270 int i, j, idx;
1271
1272 if (!reserved_mrange_info.mem_range_cnt)
1273 return;
1274
1275
1276 mem_ranges = mrange_info->mem_ranges;
1277 for (i = 0; i < mrange_info->mem_range_cnt; i++) {
1278 idx = i;
1279 for (j = (i + 1); j < mrange_info->mem_range_cnt; j++) {
1280 if (mem_ranges[idx].base > mem_ranges[j].base)
1281 idx = j;
1282 }
1283 if (idx != i) {
1284 tmp_range = mem_ranges[idx];
1285 mem_ranges[idx] = mem_ranges[i];
1286 mem_ranges[i] = tmp_range;
1287 }
1288 }
1289
1290
1291 idx = 0;
1292 for (i = 1; i < mrange_info->mem_range_cnt; i++) {
1293 base = mem_ranges[i-1].base;
1294 size = mem_ranges[i-1].size;
1295 if (mem_ranges[i].base == (base + size))
1296 mem_ranges[idx].size += mem_ranges[i].size;
1297 else {
1298 idx++;
1299 if (i == idx)
1300 continue;
1301
1302 mem_ranges[idx] = mem_ranges[i];
1303 }
1304 }
1305 mrange_info->mem_range_cnt = idx + 1;
1306}
1307
1308
1309
1310
1311
1312static void __init early_init_dt_scan_reserved_ranges(unsigned long node)
1313{
1314 const __be32 *prop;
1315 int len, ret = -1;
1316 unsigned long i;
1317
1318
1319 if (reserved_mrange_info.mem_range_cnt != 0)
1320 return;
1321
1322 prop = of_get_flat_dt_prop(node, "reserved-ranges", &len);
1323 if (!prop)
1324 return;
1325
1326
1327
1328
1329
1330 for (i = 0; i < len / (sizeof(*prop) * 4); i++) {
1331 u64 base, size;
1332
1333 base = of_read_number(prop + (i * 4) + 0, 2);
1334 size = of_read_number(prop + (i * 4) + 2, 2);
1335
1336 if (size) {
1337 ret = fadump_add_mem_range(&reserved_mrange_info,
1338 base, base + size);
1339 if (ret < 0) {
1340 pr_warn("some reserved ranges are ignored!\n");
1341 break;
1342 }
1343 }
1344 }
1345
1346
1347 sort_and_merge_mem_ranges(&reserved_mrange_info);
1348}
1349
1350
1351
1352
1353
1354
1355
1356static void fadump_release_memory(u64 begin, u64 end)
1357{
1358 u64 ra_start, ra_end, tstart;
1359 int i, ret;
1360
1361 ra_start = fw_dump.reserve_dump_area_start;
1362 ra_end = ra_start + fw_dump.reserve_dump_area_size;
1363
1364
1365
1366
1367
1368
1369 if (reserved_mrange_info.mem_range_cnt ==
1370 reserved_mrange_info.max_mem_ranges)
1371 reserved_mrange_info.mem_range_cnt--;
1372
1373 ret = fadump_add_mem_range(&reserved_mrange_info, ra_start, ra_end);
1374 if (ret != 0)
1375 return;
1376
1377
1378 sort_and_merge_mem_ranges(&reserved_mrange_info);
1379
1380
1381 tstart = begin;
1382 for (i = 0; i < reserved_mrange_info.mem_range_cnt; i++) {
1383 ra_start = reserved_mrange_info.mem_ranges[i].base;
1384 ra_end = ra_start + reserved_mrange_info.mem_ranges[i].size;
1385
1386 if (tstart >= ra_end)
1387 continue;
1388
1389 if (tstart < ra_start)
1390 fadump_release_reserved_area(tstart, ra_start);
1391 tstart = ra_end;
1392 }
1393
1394 if (tstart < end)
1395 fadump_release_reserved_area(tstart, end);
1396}
1397
1398static void fadump_invalidate_release_mem(void)
1399{
1400 mutex_lock(&fadump_mutex);
1401 if (!fw_dump.dump_active) {
1402 mutex_unlock(&fadump_mutex);
1403 return;
1404 }
1405
1406 fadump_cleanup();
1407 mutex_unlock(&fadump_mutex);
1408
1409 fadump_release_memory(fw_dump.boot_mem_top, memblock_end_of_DRAM());
1410 fadump_free_cpu_notes_buf();
1411
1412
1413
1414
1415
1416 if (fw_dump.ops->fadump_setup_metadata &&
1417 (fw_dump.ops->fadump_setup_metadata(&fw_dump) < 0))
1418 pr_warn("Failed to setup kernel metadata!\n");
1419 fw_dump.ops->fadump_init_mem_struct(&fw_dump);
1420}
1421
1422static ssize_t release_mem_store(struct kobject *kobj,
1423 struct kobj_attribute *attr,
1424 const char *buf, size_t count)
1425{
1426 int input = -1;
1427
1428 if (!fw_dump.dump_active)
1429 return -EPERM;
1430
1431 if (kstrtoint(buf, 0, &input))
1432 return -EINVAL;
1433
1434 if (input == 1) {
1435
1436
1437
1438
1439#ifdef CONFIG_PROC_VMCORE
1440 vmcore_cleanup();
1441#endif
1442 fadump_invalidate_release_mem();
1443
1444 } else
1445 return -EINVAL;
1446 return count;
1447}
1448
1449
1450static void unregister_fadump(void)
1451{
1452 fadump_cleanup();
1453 fadump_release_memory(fw_dump.reserve_dump_area_start,
1454 fw_dump.reserve_dump_area_size);
1455 fw_dump.fadump_enabled = 0;
1456 kobject_put(fadump_kobj);
1457}
1458
1459static ssize_t enabled_show(struct kobject *kobj,
1460 struct kobj_attribute *attr,
1461 char *buf)
1462{
1463 return sprintf(buf, "%d\n", fw_dump.fadump_enabled);
1464}
1465
1466static ssize_t mem_reserved_show(struct kobject *kobj,
1467 struct kobj_attribute *attr,
1468 char *buf)
1469{
1470 return sprintf(buf, "%ld\n", fw_dump.reserve_dump_area_size);
1471}
1472
1473static ssize_t registered_show(struct kobject *kobj,
1474 struct kobj_attribute *attr,
1475 char *buf)
1476{
1477 return sprintf(buf, "%d\n", fw_dump.dump_registered);
1478}
1479
1480static ssize_t registered_store(struct kobject *kobj,
1481 struct kobj_attribute *attr,
1482 const char *buf, size_t count)
1483{
1484 int ret = 0;
1485 int input = -1;
1486
1487 if (!fw_dump.fadump_enabled || fw_dump.dump_active)
1488 return -EPERM;
1489
1490 if (kstrtoint(buf, 0, &input))
1491 return -EINVAL;
1492
1493 mutex_lock(&fadump_mutex);
1494
1495 switch (input) {
1496 case 0:
1497 if (fw_dump.dump_registered == 0) {
1498 goto unlock_out;
1499 }
1500
1501
1502 pr_debug("Un-register firmware-assisted dump\n");
1503 fw_dump.ops->fadump_unregister(&fw_dump);
1504 break;
1505 case 1:
1506 if (fw_dump.dump_registered == 1) {
1507
1508 fw_dump.ops->fadump_unregister(&fw_dump);
1509 }
1510
1511 ret = register_fadump();
1512 break;
1513 default:
1514 ret = -EINVAL;
1515 break;
1516 }
1517
1518unlock_out:
1519 mutex_unlock(&fadump_mutex);
1520 return ret < 0 ? ret : count;
1521}
1522
1523static int fadump_region_show(struct seq_file *m, void *private)
1524{
1525 if (!fw_dump.fadump_enabled)
1526 return 0;
1527
1528 mutex_lock(&fadump_mutex);
1529 fw_dump.ops->fadump_region_show(&fw_dump, m);
1530 mutex_unlock(&fadump_mutex);
1531 return 0;
1532}
1533
1534static struct kobj_attribute release_attr = __ATTR_WO(release_mem);
1535static struct kobj_attribute enable_attr = __ATTR_RO(enabled);
1536static struct kobj_attribute register_attr = __ATTR_RW(registered);
1537static struct kobj_attribute mem_reserved_attr = __ATTR_RO(mem_reserved);
1538
1539static struct attribute *fadump_attrs[] = {
1540 &enable_attr.attr,
1541 ®ister_attr.attr,
1542 &mem_reserved_attr.attr,
1543 NULL,
1544};
1545
1546ATTRIBUTE_GROUPS(fadump);
1547
1548DEFINE_SHOW_ATTRIBUTE(fadump_region);
1549
1550static void fadump_init_files(void)
1551{
1552 int rc = 0;
1553
1554 fadump_kobj = kobject_create_and_add("fadump", kernel_kobj);
1555 if (!fadump_kobj) {
1556 pr_err("failed to create fadump kobject\n");
1557 return;
1558 }
1559
1560 debugfs_create_file("fadump_region", 0444, arch_debugfs_dir, NULL,
1561 &fadump_region_fops);
1562
1563 if (fw_dump.dump_active) {
1564 rc = sysfs_create_file(fadump_kobj, &release_attr.attr);
1565 if (rc)
1566 pr_err("unable to create release_mem sysfs file (%d)\n",
1567 rc);
1568 }
1569
1570 rc = sysfs_create_groups(fadump_kobj, fadump_groups);
1571 if (rc) {
1572 pr_err("sysfs group creation failed (%d), unregistering FADump",
1573 rc);
1574 unregister_fadump();
1575 return;
1576 }
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586 rc = compat_only_sysfs_link_entry_to_kobj(kernel_kobj, fadump_kobj,
1587 "enabled", "fadump_enabled");
1588 if (rc) {
1589 pr_err("unable to create fadump_enabled symlink (%d)", rc);
1590 return;
1591 }
1592
1593 rc = compat_only_sysfs_link_entry_to_kobj(kernel_kobj, fadump_kobj,
1594 "registered",
1595 "fadump_registered");
1596 if (rc) {
1597 pr_err("unable to create fadump_registered symlink (%d)", rc);
1598 sysfs_remove_link(kernel_kobj, "fadump_enabled");
1599 return;
1600 }
1601
1602 if (fw_dump.dump_active) {
1603 rc = compat_only_sysfs_link_entry_to_kobj(kernel_kobj,
1604 fadump_kobj,
1605 "release_mem",
1606 "fadump_release_mem");
1607 if (rc)
1608 pr_err("unable to create fadump_release_mem symlink (%d)",
1609 rc);
1610 }
1611 return;
1612}
1613
1614
1615
1616
1617int __init setup_fadump(void)
1618{
1619 if (!fw_dump.fadump_supported)
1620 return 0;
1621
1622 fadump_init_files();
1623 fadump_show_config();
1624
1625 if (!fw_dump.fadump_enabled)
1626 return 1;
1627
1628
1629
1630
1631
1632 if (fw_dump.dump_active) {
1633
1634
1635
1636
1637 if (fw_dump.ops->fadump_process(&fw_dump) < 0)
1638 fadump_invalidate_release_mem();
1639 }
1640
1641 else if (fw_dump.reserve_dump_area_size)
1642 fw_dump.ops->fadump_init_mem_struct(&fw_dump);
1643
1644 return 1;
1645}
1646subsys_initcall(setup_fadump);
1647#else
1648
1649
1650int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname,
1651 int depth, void *data)
1652{
1653 if ((depth != 1) || (strcmp(uname, "ibm,opal") != 0))
1654 return 0;
1655
1656 opal_fadump_dt_scan(&fw_dump, node);
1657 return 1;
1658}
1659
1660
1661
1662
1663
1664
1665int __init fadump_reserve_mem(void)
1666{
1667 if (fw_dump.dump_active) {
1668
1669
1670
1671
1672 pr_info("Preserving crash data for processing in next boot.\n");
1673 fadump_reserve_crash_area(fw_dump.boot_mem_top);
1674 } else
1675 pr_debug("FADump-aware kernel..\n");
1676
1677 return 1;
1678}
1679#endif
1680
1681
1682static void __init fadump_reserve_crash_area(u64 base)
1683{
1684 u64 i, mstart, mend, msize;
1685
1686 for_each_mem_range(i, &mstart, &mend) {
1687 msize = mend - mstart;
1688
1689 if ((mstart + msize) < base)
1690 continue;
1691
1692 if (mstart < base) {
1693 msize -= (base - mstart);
1694 mstart = base;
1695 }
1696
1697 pr_info("Reserving %lluMB of memory at %#016llx for preserving crash data",
1698 (msize >> 20), mstart);
1699 memblock_reserve(mstart, msize);
1700 }
1701}
1702
1703unsigned long __init arch_reserved_kernel_pages(void)
1704{
1705 return memblock_reserved_size() / PAGE_SIZE;
1706}
1707