1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Firmware Assisted dump: A robust mechanism to get reliable kernel crash
4 * dump with assistance from firmware. This approach does not use kexec,
5 * instead firmware assists in booting the kdump kernel while preserving
6 * memory contents. The most of the code implementation has been adapted
7 * from phyp assisted dump implementation written by Linas Vepstas and
10 * Copyright 2011 IBM Corporation
11 * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
15 #define pr_fmt(fmt) "fadump: " fmt
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>
28 #include <asm/debugfs.h>
32 #include <asm/fadump.h>
33 #include <asm/setup.h>
35 static struct fw_dump fw_dump
;
36 static struct fadump_mem_struct fdm
;
37 static const struct fadump_mem_struct
*fdm_active
;
39 static struct cma
*fadump_cma
;
42 static DEFINE_MUTEX(fadump_mutex
);
43 struct fad_crash_memory_ranges
*crash_memory_ranges
;
44 int crash_memory_ranges_size
;
46 int max_crash_mem_ranges
;
50 * fadump_cma_init() - Initialize CMA area from a fadump reserved memory
52 * This function initializes CMA area from fadump reserved memory.
53 * The total size of fadump reserved memory covers for boot memory size
54 * + cpu data size + hpte size and metadata.
55 * Initialize only the area equivalent to boot memory size for CMA use.
56 * The reamining portion of fadump reserved memory will be not given
57 * to CMA and pages for thoes will stay reserved. boot memory size is
58 * aligned per CMA requirement to satisy cma_init_reserved_mem() call.
59 * But for some reason even if it fails we still have the memory reservation
60 * with us and we can still continue doing fadump.
62 int __init
fadump_cma_init(void)
64 unsigned long long base
, size
;
67 if (!fw_dump
.fadump_enabled
)
71 * Do not use CMA if user has provided fadump=nocma kernel parameter.
72 * Return 1 to continue with fadump old behaviour.
77 base
= fw_dump
.reserve_dump_area_start
;
78 size
= fw_dump
.boot_memory_size
;
83 rc
= cma_init_reserved_mem(base
, size
, 0, "fadump_cma", &fadump_cma
);
85 pr_err("Failed to init cma area for firmware-assisted dump,%d\n", rc
);
87 * Though the CMA init has failed we still have memory
88 * reservation with us. The reserved memory will be
89 * blocked from production system usage. Hence return 1,
90 * so that we can continue with fadump.
96 * So we now have successfully initialized cma area for fadump.
98 pr_info("Initialized 0x%lx bytes cma area at %ldMB from 0x%lx "
99 "bytes of memory reserved for firmware-assisted dump\n",
100 cma_get_size(fadump_cma
),
101 (unsigned long)cma_get_base(fadump_cma
) >> 20,
102 fw_dump
.reserve_dump_area_size
);
106 static int __init
fadump_cma_init(void) { return 1; }
107 #endif /* CONFIG_CMA */
109 /* Scan the Firmware Assisted dump configuration details. */
110 int __init
early_init_dt_scan_fw_dump(unsigned long node
,
111 const char *uname
, int depth
, void *data
)
113 const __be32
*sections
;
118 if (depth
!= 1 || strcmp(uname
, "rtas") != 0)
122 * Check if Firmware Assisted dump is supported. if yes, check
123 * if dump has been initiated on last reboot.
125 token
= of_get_flat_dt_prop(node
, "ibm,configure-kernel-dump", NULL
);
129 fw_dump
.fadump_supported
= 1;
130 fw_dump
.ibm_configure_kernel_dump
= be32_to_cpu(*token
);
133 * The 'ibm,kernel-dump' rtas node is present only if there is
134 * dump data waiting for us.
136 fdm_active
= of_get_flat_dt_prop(node
, "ibm,kernel-dump", NULL
);
138 fw_dump
.dump_active
= 1;
140 /* Get the sizes required to store dump data for the firmware provided
142 * For each dump section type supported, a 32bit cell which defines
143 * the ID of a supported section followed by two 32 bit cells which
144 * gives teh size of the section in bytes.
146 sections
= of_get_flat_dt_prop(node
, "ibm,configure-kernel-dump-sizes",
152 num_sections
= size
/ (3 * sizeof(u32
));
154 for (i
= 0; i
< num_sections
; i
++, sections
+= 3) {
155 u32 type
= (u32
)of_read_number(sections
, 1);
158 case FADUMP_CPU_STATE_DATA
:
159 fw_dump
.cpu_state_data_size
=
160 of_read_ulong(§ions
[1], 2);
162 case FADUMP_HPTE_REGION
:
163 fw_dump
.hpte_region_size
=
164 of_read_ulong(§ions
[1], 2);
173 * If fadump is registered, check if the memory provided
174 * falls within boot memory area and reserved memory area.
176 int is_fadump_memory_area(u64 addr
, ulong size
)
178 u64 d_start
= fw_dump
.reserve_dump_area_start
;
179 u64 d_end
= d_start
+ fw_dump
.reserve_dump_area_size
;
181 if (!fw_dump
.dump_registered
)
184 if (((addr
+ size
) > d_start
) && (addr
<= d_end
))
187 return (addr
+ size
) > RMA_START
&& addr
<= fw_dump
.boot_memory_size
;
190 int should_fadump_crash(void)
192 if (!fw_dump
.dump_registered
|| !fw_dump
.fadumphdr_addr
)
197 int is_fadump_active(void)
199 return fw_dump
.dump_active
;
203 * Returns 1, if there are no holes in boot memory area,
206 static int is_boot_memory_area_contiguous(void)
208 struct memblock_region
*reg
;
209 unsigned long tstart
, tend
;
210 unsigned long start_pfn
= PHYS_PFN(RMA_START
);
211 unsigned long end_pfn
= PHYS_PFN(RMA_START
+ fw_dump
.boot_memory_size
);
212 unsigned int ret
= 0;
214 for_each_memblock(memory
, reg
) {
215 tstart
= max(start_pfn
, memblock_region_memory_base_pfn(reg
));
216 tend
= min(end_pfn
, memblock_region_memory_end_pfn(reg
));
218 /* Memory hole from start_pfn to tstart */
219 if (tstart
> start_pfn
)
222 if (tend
== end_pfn
) {
227 start_pfn
= tend
+ 1;
235 * Returns true, if there are no holes in reserved memory area,
238 static bool is_reserved_memory_area_contiguous(void)
240 struct memblock_region
*reg
;
241 unsigned long start
, end
;
242 unsigned long d_start
= fw_dump
.reserve_dump_area_start
;
243 unsigned long d_end
= d_start
+ fw_dump
.reserve_dump_area_size
;
245 for_each_memblock(memory
, reg
) {
246 start
= max(d_start
, (unsigned long)reg
->base
);
247 end
= min(d_end
, (unsigned long)(reg
->base
+ reg
->size
));
249 /* Memory hole from d_start to start */
263 /* Print firmware assisted dump configurations for debugging purpose. */
264 static void fadump_show_config(void)
266 pr_debug("Support for firmware-assisted dump (fadump): %s\n",
267 (fw_dump
.fadump_supported
? "present" : "no support"));
269 if (!fw_dump
.fadump_supported
)
272 pr_debug("Fadump enabled : %s\n",
273 (fw_dump
.fadump_enabled
? "yes" : "no"));
274 pr_debug("Dump Active : %s\n",
275 (fw_dump
.dump_active
? "yes" : "no"));
276 pr_debug("Dump section sizes:\n");
277 pr_debug(" CPU state data size: %lx\n", fw_dump
.cpu_state_data_size
);
278 pr_debug(" HPTE region size : %lx\n", fw_dump
.hpte_region_size
);
279 pr_debug("Boot memory size : %lx\n", fw_dump
.boot_memory_size
);
282 static unsigned long init_fadump_mem_struct(struct fadump_mem_struct
*fdm
,
288 memset(fdm
, 0, sizeof(struct fadump_mem_struct
));
289 addr
= addr
& PAGE_MASK
;
291 fdm
->header
.dump_format_version
= cpu_to_be32(0x00000001);
292 fdm
->header
.dump_num_sections
= cpu_to_be16(3);
293 fdm
->header
.dump_status_flag
= 0;
294 fdm
->header
.offset_first_dump_section
=
295 cpu_to_be32((u32
)offsetof(struct fadump_mem_struct
, cpu_state_data
));
298 * Fields for disk dump option.
299 * We are not using disk dump option, hence set these fields to 0.
301 fdm
->header
.dd_block_size
= 0;
302 fdm
->header
.dd_block_offset
= 0;
303 fdm
->header
.dd_num_blocks
= 0;
304 fdm
->header
.dd_offset_disk_path
= 0;
306 /* set 0 to disable an automatic dump-reboot. */
307 fdm
->header
.max_time_auto
= 0;
309 /* Kernel dump sections */
310 /* cpu state data section. */
311 fdm
->cpu_state_data
.request_flag
= cpu_to_be32(FADUMP_REQUEST_FLAG
);
312 fdm
->cpu_state_data
.source_data_type
= cpu_to_be16(FADUMP_CPU_STATE_DATA
);
313 fdm
->cpu_state_data
.source_address
= 0;
314 fdm
->cpu_state_data
.source_len
= cpu_to_be64(fw_dump
.cpu_state_data_size
);
315 fdm
->cpu_state_data
.destination_address
= cpu_to_be64(addr
);
316 addr
+= fw_dump
.cpu_state_data_size
;
318 /* hpte region section */
319 fdm
->hpte_region
.request_flag
= cpu_to_be32(FADUMP_REQUEST_FLAG
);
320 fdm
->hpte_region
.source_data_type
= cpu_to_be16(FADUMP_HPTE_REGION
);
321 fdm
->hpte_region
.source_address
= 0;
322 fdm
->hpte_region
.source_len
= cpu_to_be64(fw_dump
.hpte_region_size
);
323 fdm
->hpte_region
.destination_address
= cpu_to_be64(addr
);
324 addr
+= fw_dump
.hpte_region_size
;
326 /* RMA region section */
327 fdm
->rmr_region
.request_flag
= cpu_to_be32(FADUMP_REQUEST_FLAG
);
328 fdm
->rmr_region
.source_data_type
= cpu_to_be16(FADUMP_REAL_MODE_REGION
);
329 fdm
->rmr_region
.source_address
= cpu_to_be64(RMA_START
);
330 fdm
->rmr_region
.source_len
= cpu_to_be64(fw_dump
.boot_memory_size
);
331 fdm
->rmr_region
.destination_address
= cpu_to_be64(addr
);
332 addr
+= fw_dump
.boot_memory_size
;
338 * fadump_calculate_reserve_size(): reserve variable boot area 5% of System RAM
340 * Function to find the largest memory size we need to reserve during early
341 * boot process. This will be the size of the memory that is required for a
342 * kernel to boot successfully.
344 * This function has been taken from phyp-assisted dump feature implementation.
346 * returns larger of 256MB or 5% rounded down to multiples of 256MB.
348 * TODO: Come up with better approach to find out more accurate memory size
349 * that is required for a kernel to boot successfully.
352 static inline unsigned long fadump_calculate_reserve_size(void)
355 unsigned long long base
, size
;
357 if (fw_dump
.reserve_bootvar
)
358 pr_warn("'fadump_reserve_mem=' parameter is deprecated in favor of 'crashkernel=' parameter.\n");
361 * Check if the size is specified through crashkernel= cmdline
362 * option. If yes, then use that but ignore base as fadump reserves
363 * memory at a predefined offset.
365 ret
= parse_crashkernel(boot_command_line
, memblock_phys_mem_size(),
367 if (ret
== 0 && size
> 0) {
368 unsigned long max_size
;
370 if (fw_dump
.reserve_bootvar
)
371 pr_info("Using 'crashkernel=' parameter for memory reservation.\n");
373 fw_dump
.reserve_bootvar
= (unsigned long)size
;
376 * Adjust if the boot memory size specified is above
379 max_size
= memblock_phys_mem_size() / MAX_BOOT_MEM_RATIO
;
380 if (fw_dump
.reserve_bootvar
> max_size
) {
381 fw_dump
.reserve_bootvar
= max_size
;
382 pr_info("Adjusted boot memory size to %luMB\n",
383 (fw_dump
.reserve_bootvar
>> 20));
386 return fw_dump
.reserve_bootvar
;
387 } else if (fw_dump
.reserve_bootvar
) {
389 * 'fadump_reserve_mem=' is being used to reserve memory
390 * for firmware-assisted dump.
392 return fw_dump
.reserve_bootvar
;
395 /* divide by 20 to get 5% of value */
396 size
= memblock_phys_mem_size() / 20;
398 /* round it down in multiples of 256 */
399 size
= size
& ~0x0FFFFFFFUL
;
401 /* Truncate to memory_limit. We don't want to over reserve the memory.*/
402 if (memory_limit
&& size
> memory_limit
)
405 return (size
> MIN_BOOT_MEM
? size
: MIN_BOOT_MEM
);
409 * Calculate the total memory size required to be reserved for
410 * firmware-assisted dump registration.
412 static unsigned long get_fadump_area_size(void)
414 unsigned long size
= 0;
416 size
+= fw_dump
.cpu_state_data_size
;
417 size
+= fw_dump
.hpte_region_size
;
418 size
+= fw_dump
.boot_memory_size
;
419 size
+= sizeof(struct fadump_crash_info_header
);
420 size
+= sizeof(struct elfhdr
); /* ELF core header.*/
421 size
+= sizeof(struct elf_phdr
); /* place holder for cpu notes */
422 /* Program headers for crash memory regions. */
423 size
+= sizeof(struct elf_phdr
) * (memblock_num_regions(memory
) + 2);
425 size
= PAGE_ALIGN(size
);
429 static void __init
fadump_reserve_crash_area(unsigned long base
,
432 struct memblock_region
*reg
;
433 unsigned long mstart
, mend
, msize
;
435 for_each_memblock(memory
, reg
) {
436 mstart
= max_t(unsigned long, base
, reg
->base
);
437 mend
= reg
->base
+ reg
->size
;
438 mend
= min(base
+ size
, mend
);
441 msize
= mend
- mstart
;
442 memblock_reserve(mstart
, msize
);
443 pr_info("Reserved %ldMB of memory at %#016lx for saving crash dump\n",
444 (msize
>> 20), mstart
);
449 int __init
fadump_reserve_mem(void)
451 unsigned long base
, size
, memory_boundary
;
453 if (!fw_dump
.fadump_enabled
)
456 if (!fw_dump
.fadump_supported
) {
457 printk(KERN_INFO
"Firmware-assisted dump is not supported on"
459 fw_dump
.fadump_enabled
= 0;
463 * Initialize boot memory size
464 * If dump is active then we have already calculated the size during
468 fw_dump
.boot_memory_size
= be64_to_cpu(fdm_active
->rmr_region
.source_len
);
470 fw_dump
.boot_memory_size
= fadump_calculate_reserve_size();
473 fw_dump
.boot_memory_size
=
474 ALIGN(fw_dump
.boot_memory_size
,
475 FADUMP_CMA_ALIGNMENT
);
480 * Calculate the memory boundary.
481 * If memory_limit is less than actual memory boundary then reserve
482 * the memory for fadump beyond the memory_limit and adjust the
483 * memory_limit accordingly, so that the running kernel can run with
484 * specified memory_limit.
486 if (memory_limit
&& memory_limit
< memblock_end_of_DRAM()) {
487 size
= get_fadump_area_size();
488 if ((memory_limit
+ size
) < memblock_end_of_DRAM())
489 memory_limit
+= size
;
491 memory_limit
= memblock_end_of_DRAM();
492 printk(KERN_INFO
"Adjusted memory_limit for firmware-assisted"
493 " dump, now %#016llx\n", memory_limit
);
496 memory_boundary
= memory_limit
;
498 memory_boundary
= memblock_end_of_DRAM();
500 if (fw_dump
.dump_active
) {
501 pr_info("Firmware-assisted dump is active.\n");
503 #ifdef CONFIG_HUGETLB_PAGE
505 * FADump capture kernel doesn't care much about hugepages.
506 * In fact, handling hugepages in capture kernel is asking for
507 * trouble. So, disable HugeTLB support when fadump is active.
509 hugetlb_disabled
= true;
512 * If last boot has crashed then reserve all the memory
513 * above boot_memory_size so that we don't touch it until
514 * dump is written to disk by userspace tool. This memory
515 * will be released for general use once the dump is saved.
517 base
= fw_dump
.boot_memory_size
;
518 size
= memory_boundary
- base
;
519 fadump_reserve_crash_area(base
, size
);
521 fw_dump
.fadumphdr_addr
=
522 be64_to_cpu(fdm_active
->rmr_region
.destination_address
) +
523 be64_to_cpu(fdm_active
->rmr_region
.source_len
);
524 pr_debug("fadumphdr_addr = %pa\n", &fw_dump
.fadumphdr_addr
);
525 fw_dump
.reserve_dump_area_start
= base
;
526 fw_dump
.reserve_dump_area_size
= size
;
528 size
= get_fadump_area_size();
531 * Reserve memory at an offset closer to bottom of the RAM to
532 * minimize the impact of memory hot-remove operation. We can't
533 * use memblock_find_in_range() here since it doesn't allocate
534 * from bottom to top.
536 for (base
= fw_dump
.boot_memory_size
;
537 base
<= (memory_boundary
- size
);
539 if (memblock_is_region_memory(base
, size
) &&
540 !memblock_is_region_reserved(base
, size
))
543 if ((base
> (memory_boundary
- size
)) ||
544 memblock_reserve(base
, size
)) {
545 pr_err("Failed to reserve memory\n");
549 pr_info("Reserved %ldMB of memory at %ldMB for firmware-"
550 "assisted dump (System RAM: %ldMB)\n",
551 (unsigned long)(size
>> 20),
552 (unsigned long)(base
>> 20),
553 (unsigned long)(memblock_phys_mem_size() >> 20));
555 fw_dump
.reserve_dump_area_start
= base
;
556 fw_dump
.reserve_dump_area_size
= size
;
557 return fadump_cma_init();
562 unsigned long __init
arch_reserved_kernel_pages(void)
564 return memblock_reserved_size() / PAGE_SIZE
;
567 /* Look for fadump= cmdline option. */
568 static int __init
early_fadump_param(char *p
)
573 if (strncmp(p
, "on", 2) == 0)
574 fw_dump
.fadump_enabled
= 1;
575 else if (strncmp(p
, "off", 3) == 0)
576 fw_dump
.fadump_enabled
= 0;
577 else if (strncmp(p
, "nocma", 5) == 0) {
578 fw_dump
.fadump_enabled
= 1;
584 early_param("fadump", early_fadump_param
);
587 * Look for fadump_reserve_mem= cmdline option
588 * TODO: Remove references to 'fadump_reserve_mem=' parameter,
589 * the sooner 'crashkernel=' parameter is accustomed to.
591 static int __init
early_fadump_reserve_mem(char *p
)
594 fw_dump
.reserve_bootvar
= memparse(p
, &p
);
597 early_param("fadump_reserve_mem", early_fadump_reserve_mem
);
599 static int register_fw_dump(struct fadump_mem_struct
*fdm
)
602 unsigned int wait_time
;
604 pr_debug("Registering for firmware-assisted kernel dump...\n");
606 /* TODO: Add upper time limit for the delay */
608 rc
= rtas_call(fw_dump
.ibm_configure_kernel_dump
, 3, 1, NULL
,
609 FADUMP_REGISTER
, fdm
,
610 sizeof(struct fadump_mem_struct
));
612 wait_time
= rtas_busy_delay_time(rc
);
621 pr_err("Failed to register. Unknown Error(%d).\n", rc
);
624 printk(KERN_ERR
"Failed to register firmware-assisted kernel"
625 " dump. Hardware Error(%d).\n", rc
);
628 if (!is_boot_memory_area_contiguous())
629 pr_err("Can't have holes in boot memory area while registering fadump\n");
630 else if (!is_reserved_memory_area_contiguous())
631 pr_err("Can't have holes in reserved memory area while"
632 " registering fadump\n");
634 printk(KERN_ERR
"Failed to register firmware-assisted kernel"
635 " dump. Parameter Error(%d).\n", rc
);
639 printk(KERN_ERR
"firmware-assisted kernel dump is already "
641 fw_dump
.dump_registered
= 1;
645 printk(KERN_INFO
"firmware-assisted kernel dump registration"
647 fw_dump
.dump_registered
= 1;
654 void crash_fadump(struct pt_regs
*regs
, const char *str
)
656 struct fadump_crash_info_header
*fdh
= NULL
;
657 int old_cpu
, this_cpu
;
659 if (!should_fadump_crash())
663 * old_cpu == -1 means this is the first CPU which has come here,
664 * go ahead and trigger fadump.
666 * old_cpu != -1 means some other CPU has already on it's way
667 * to trigger fadump, just keep looping here.
669 this_cpu
= smp_processor_id();
670 old_cpu
= cmpxchg(&crashing_cpu
, -1, this_cpu
);
674 * We can't loop here indefinitely. Wait as long as fadump
675 * is in force. If we race with fadump un-registration this
676 * loop will break and then we go down to normal panic path
677 * and reboot. If fadump is in force the first crashing
678 * cpu will definitely trigger fadump.
680 while (fw_dump
.dump_registered
)
685 fdh
= __va(fw_dump
.fadumphdr_addr
);
686 fdh
->crashing_cpu
= crashing_cpu
;
687 crash_save_vmcoreinfo();
692 ppc_save_regs(&fdh
->regs
);
694 fdh
->online_mask
= *cpu_online_mask
;
696 /* Call ibm,os-term rtas call to trigger firmware assisted dump */
697 rtas_os_term((char *)str
);
700 #define GPR_MASK 0xffffff0000000000
701 static inline int fadump_gpr_index(u64 id
)
706 if ((id
& GPR_MASK
) == REG_ID("GPR")) {
707 /* get the digits at the end */
712 str
[0] = (id
>> 8) & 0xff;
713 sscanf(str
, "%d", &i
);
720 static inline void fadump_set_regval(struct pt_regs
*regs
, u64 reg_id
,
725 i
= fadump_gpr_index(reg_id
);
727 regs
->gpr
[i
] = (unsigned long)reg_val
;
728 else if (reg_id
== REG_ID("NIA"))
729 regs
->nip
= (unsigned long)reg_val
;
730 else if (reg_id
== REG_ID("MSR"))
731 regs
->msr
= (unsigned long)reg_val
;
732 else if (reg_id
== REG_ID("CTR"))
733 regs
->ctr
= (unsigned long)reg_val
;
734 else if (reg_id
== REG_ID("LR"))
735 regs
->link
= (unsigned long)reg_val
;
736 else if (reg_id
== REG_ID("XER"))
737 regs
->xer
= (unsigned long)reg_val
;
738 else if (reg_id
== REG_ID("CR"))
739 regs
->ccr
= (unsigned long)reg_val
;
740 else if (reg_id
== REG_ID("DAR"))
741 regs
->dar
= (unsigned long)reg_val
;
742 else if (reg_id
== REG_ID("DSISR"))
743 regs
->dsisr
= (unsigned long)reg_val
;
746 static struct fadump_reg_entry
*
747 fadump_read_registers(struct fadump_reg_entry
*reg_entry
, struct pt_regs
*regs
)
749 memset(regs
, 0, sizeof(struct pt_regs
));
751 while (be64_to_cpu(reg_entry
->reg_id
) != REG_ID("CPUEND")) {
752 fadump_set_regval(regs
, be64_to_cpu(reg_entry
->reg_id
),
753 be64_to_cpu(reg_entry
->reg_value
));
760 static u32
*fadump_regs_to_elf_notes(u32
*buf
, struct pt_regs
*regs
)
762 struct elf_prstatus prstatus
;
764 memset(&prstatus
, 0, sizeof(prstatus
));
766 * FIXME: How do i get PID? Do I really need it?
767 * prstatus.pr_pid = ????
769 elf_core_copy_kernel_regs(&prstatus
.pr_reg
, regs
);
770 buf
= append_elf_note(buf
, CRASH_CORE_NOTE_NAME
, NT_PRSTATUS
,
771 &prstatus
, sizeof(prstatus
));
775 static void fadump_update_elfcore_header(char *bufp
)
778 struct elf_phdr
*phdr
;
780 elf
= (struct elfhdr
*)bufp
;
781 bufp
+= sizeof(struct elfhdr
);
783 /* First note is a place holder for cpu notes info. */
784 phdr
= (struct elf_phdr
*)bufp
;
786 if (phdr
->p_type
== PT_NOTE
) {
787 phdr
->p_paddr
= fw_dump
.cpu_notes_buf
;
788 phdr
->p_offset
= phdr
->p_paddr
;
789 phdr
->p_filesz
= fw_dump
.cpu_notes_buf_size
;
790 phdr
->p_memsz
= fw_dump
.cpu_notes_buf_size
;
795 static void *fadump_cpu_notes_buf_alloc(unsigned long size
)
799 unsigned long order
, count
, i
;
801 order
= get_order(size
);
802 vaddr
= (void *)__get_free_pages(GFP_KERNEL
|__GFP_ZERO
, order
);
807 page
= virt_to_page(vaddr
);
808 for (i
= 0; i
< count
; i
++)
809 SetPageReserved(page
+ i
);
813 static void fadump_cpu_notes_buf_free(unsigned long vaddr
, unsigned long size
)
816 unsigned long order
, count
, i
;
818 order
= get_order(size
);
820 page
= virt_to_page(vaddr
);
821 for (i
= 0; i
< count
; i
++)
822 ClearPageReserved(page
+ i
);
823 __free_pages(page
, order
);
827 * Read CPU state dump data and convert it into ELF notes.
828 * The CPU dump starts with magic number "REGSAVE". NumCpusOffset should be
829 * used to access the data to allow for additional fields to be added without
830 * affecting compatibility. Each list of registers for a CPU starts with
831 * "CPUSTRT" and ends with "CPUEND". Each register entry is of 16 bytes,
832 * 8 Byte ASCII identifier and 8 Byte register value. The register entry
833 * with identifier "CPUSTRT" and "CPUEND" contains 4 byte cpu id as part
834 * of register value. For more details refer to PAPR document.
836 * Only for the crashing cpu we ignore the CPU dump data and get exact
837 * state from fadump crash info structure populated by first kernel at the
840 static int __init
fadump_build_cpu_notes(const struct fadump_mem_struct
*fdm
)
842 struct fadump_reg_save_area_header
*reg_header
;
843 struct fadump_reg_entry
*reg_entry
;
844 struct fadump_crash_info_header
*fdh
= NULL
;
847 u32 num_cpus
, *note_buf
;
849 int i
, rc
= 0, cpu
= 0;
851 if (!fdm
->cpu_state_data
.bytes_dumped
)
854 addr
= be64_to_cpu(fdm
->cpu_state_data
.destination_address
);
858 if (be64_to_cpu(reg_header
->magic_number
) != REGSAVE_AREA_MAGIC
) {
859 printk(KERN_ERR
"Unable to read register save area.\n");
862 pr_debug("--------CPU State Data------------\n");
863 pr_debug("Magic Number: %llx\n", be64_to_cpu(reg_header
->magic_number
));
864 pr_debug("NumCpuOffset: %x\n", be32_to_cpu(reg_header
->num_cpu_offset
));
866 vaddr
+= be32_to_cpu(reg_header
->num_cpu_offset
);
867 num_cpus
= be32_to_cpu(*((__be32
*)(vaddr
)));
868 pr_debug("NumCpus : %u\n", num_cpus
);
869 vaddr
+= sizeof(u32
);
870 reg_entry
= (struct fadump_reg_entry
*)vaddr
;
872 /* Allocate buffer to hold cpu crash notes. */
873 fw_dump
.cpu_notes_buf_size
= num_cpus
* sizeof(note_buf_t
);
874 fw_dump
.cpu_notes_buf_size
= PAGE_ALIGN(fw_dump
.cpu_notes_buf_size
);
875 note_buf
= fadump_cpu_notes_buf_alloc(fw_dump
.cpu_notes_buf_size
);
877 printk(KERN_ERR
"Failed to allocate 0x%lx bytes for "
878 "cpu notes buffer\n", fw_dump
.cpu_notes_buf_size
);
881 fw_dump
.cpu_notes_buf
= __pa(note_buf
);
883 pr_debug("Allocated buffer for cpu notes of size %ld at %p\n",
884 (num_cpus
* sizeof(note_buf_t
)), note_buf
);
886 if (fw_dump
.fadumphdr_addr
)
887 fdh
= __va(fw_dump
.fadumphdr_addr
);
889 for (i
= 0; i
< num_cpus
; i
++) {
890 if (be64_to_cpu(reg_entry
->reg_id
) != REG_ID("CPUSTRT")) {
891 printk(KERN_ERR
"Unable to read CPU state data\n");
895 /* Lower 4 bytes of reg_value contains logical cpu id */
896 cpu
= be64_to_cpu(reg_entry
->reg_value
) & FADUMP_CPU_ID_MASK
;
897 if (fdh
&& !cpumask_test_cpu(cpu
, &fdh
->online_mask
)) {
898 SKIP_TO_NEXT_CPU(reg_entry
);
901 pr_debug("Reading register data for cpu %d...\n", cpu
);
902 if (fdh
&& fdh
->crashing_cpu
== cpu
) {
904 note_buf
= fadump_regs_to_elf_notes(note_buf
, ®s
);
905 SKIP_TO_NEXT_CPU(reg_entry
);
908 reg_entry
= fadump_read_registers(reg_entry
, ®s
);
909 note_buf
= fadump_regs_to_elf_notes(note_buf
, ®s
);
912 final_note(note_buf
);
915 pr_debug("Updating elfcore header (%llx) with cpu notes\n",
916 fdh
->elfcorehdr_addr
);
917 fadump_update_elfcore_header((char *)__va(fdh
->elfcorehdr_addr
));
922 fadump_cpu_notes_buf_free((unsigned long)__va(fw_dump
.cpu_notes_buf
),
923 fw_dump
.cpu_notes_buf_size
);
924 fw_dump
.cpu_notes_buf
= 0;
925 fw_dump
.cpu_notes_buf_size
= 0;
931 * Validate and process the dump data stored by firmware before exporting
932 * it through '/proc/vmcore'.
934 static int __init
process_fadump(const struct fadump_mem_struct
*fdm_active
)
936 struct fadump_crash_info_header
*fdh
;
939 if (!fdm_active
|| !fw_dump
.fadumphdr_addr
)
942 /* Check if the dump data is valid. */
943 if ((be16_to_cpu(fdm_active
->header
.dump_status_flag
) == FADUMP_ERROR_FLAG
) ||
944 (fdm_active
->cpu_state_data
.error_flags
!= 0) ||
945 (fdm_active
->rmr_region
.error_flags
!= 0)) {
946 printk(KERN_ERR
"Dump taken by platform is not valid\n");
949 if ((fdm_active
->rmr_region
.bytes_dumped
!=
950 fdm_active
->rmr_region
.source_len
) ||
951 !fdm_active
->cpu_state_data
.bytes_dumped
) {
952 printk(KERN_ERR
"Dump taken by platform is incomplete\n");
956 /* Validate the fadump crash info header */
957 fdh
= __va(fw_dump
.fadumphdr_addr
);
958 if (fdh
->magic_number
!= FADUMP_CRASH_INFO_MAGIC
) {
959 printk(KERN_ERR
"Crash info header is not valid.\n");
963 rc
= fadump_build_cpu_notes(fdm_active
);
968 * We are done validating dump info and elfcore header is now ready
969 * to be exported. set elfcorehdr_addr so that vmcore module will
970 * export the elfcore header through '/proc/vmcore'.
972 elfcorehdr_addr
= fdh
->elfcorehdr_addr
;
977 static void free_crash_memory_ranges(void)
979 kfree(crash_memory_ranges
);
980 crash_memory_ranges
= NULL
;
981 crash_memory_ranges_size
= 0;
982 max_crash_mem_ranges
= 0;
986 * Allocate or reallocate crash memory ranges array in incremental units
989 static int allocate_crash_memory_ranges(void)
991 struct fad_crash_memory_ranges
*new_array
;
994 new_size
= crash_memory_ranges_size
+ PAGE_SIZE
;
995 pr_debug("Allocating %llu bytes of memory for crash memory ranges\n",
998 new_array
= krealloc(crash_memory_ranges
, new_size
, GFP_KERNEL
);
999 if (new_array
== NULL
) {
1000 pr_err("Insufficient memory for setting up crash memory ranges\n");
1001 free_crash_memory_ranges();
1005 crash_memory_ranges
= new_array
;
1006 crash_memory_ranges_size
= new_size
;
1007 max_crash_mem_ranges
= (new_size
/
1008 sizeof(struct fad_crash_memory_ranges
));
1012 static inline int fadump_add_crash_memory(unsigned long long base
,
1013 unsigned long long end
)
1016 bool is_adjacent
= false;
1022 * Fold adjacent memory ranges to bring down the memory ranges/
1023 * PT_LOAD segments count.
1025 if (crash_mem_ranges
) {
1026 start
= crash_memory_ranges
[crash_mem_ranges
- 1].base
;
1027 size
= crash_memory_ranges
[crash_mem_ranges
- 1].size
;
1029 if ((start
+ size
) == base
)
1033 /* resize the array on reaching the limit */
1034 if (crash_mem_ranges
== max_crash_mem_ranges
) {
1037 ret
= allocate_crash_memory_ranges();
1043 crash_memory_ranges
[crash_mem_ranges
].base
= start
;
1047 crash_memory_ranges
[crash_mem_ranges
- 1].size
= (end
- start
);
1048 pr_debug("crash_memory_range[%d] [%#016llx-%#016llx], %#llx bytes\n",
1049 (crash_mem_ranges
- 1), start
, end
- 1, (end
- start
));
1053 static int fadump_exclude_reserved_area(unsigned long long start
,
1054 unsigned long long end
)
1056 unsigned long long ra_start
, ra_end
;
1059 ra_start
= fw_dump
.reserve_dump_area_start
;
1060 ra_end
= ra_start
+ fw_dump
.reserve_dump_area_size
;
1062 if ((ra_start
< end
) && (ra_end
> start
)) {
1063 if ((start
< ra_start
) && (end
> ra_end
)) {
1064 ret
= fadump_add_crash_memory(start
, ra_start
);
1068 ret
= fadump_add_crash_memory(ra_end
, end
);
1069 } else if (start
< ra_start
) {
1070 ret
= fadump_add_crash_memory(start
, ra_start
);
1071 } else if (ra_end
< end
) {
1072 ret
= fadump_add_crash_memory(ra_end
, end
);
1075 ret
= fadump_add_crash_memory(start
, end
);
1080 static int fadump_init_elfcore_header(char *bufp
)
1084 elf
= (struct elfhdr
*) bufp
;
1085 bufp
+= sizeof(struct elfhdr
);
1086 memcpy(elf
->e_ident
, ELFMAG
, SELFMAG
);
1087 elf
->e_ident
[EI_CLASS
] = ELF_CLASS
;
1088 elf
->e_ident
[EI_DATA
] = ELF_DATA
;
1089 elf
->e_ident
[EI_VERSION
] = EV_CURRENT
;
1090 elf
->e_ident
[EI_OSABI
] = ELF_OSABI
;
1091 memset(elf
->e_ident
+EI_PAD
, 0, EI_NIDENT
-EI_PAD
);
1092 elf
->e_type
= ET_CORE
;
1093 elf
->e_machine
= ELF_ARCH
;
1094 elf
->e_version
= EV_CURRENT
;
1096 elf
->e_phoff
= sizeof(struct elfhdr
);
1098 #if defined(_CALL_ELF)
1099 elf
->e_flags
= _CALL_ELF
;
1103 elf
->e_ehsize
= sizeof(struct elfhdr
);
1104 elf
->e_phentsize
= sizeof(struct elf_phdr
);
1106 elf
->e_shentsize
= 0;
1108 elf
->e_shstrndx
= 0;
1114 * Traverse through memblock structure and setup crash memory ranges. These
1115 * ranges will be used create PT_LOAD program headers in elfcore header.
1117 static int fadump_setup_crash_memory_ranges(void)
1119 struct memblock_region
*reg
;
1120 unsigned long long start
, end
;
1123 pr_debug("Setup crash memory ranges.\n");
1124 crash_mem_ranges
= 0;
1127 * add the first memory chunk (RMA_START through boot_memory_size) as
1128 * a separate memory chunk. The reason is, at the time crash firmware
1129 * will move the content of this memory chunk to different location
1130 * specified during fadump registration. We need to create a separate
1131 * program header for this chunk with the correct offset.
1133 ret
= fadump_add_crash_memory(RMA_START
, fw_dump
.boot_memory_size
);
1137 for_each_memblock(memory
, reg
) {
1138 start
= (unsigned long long)reg
->base
;
1139 end
= start
+ (unsigned long long)reg
->size
;
1142 * skip the first memory chunk that is already added (RMA_START
1143 * through boot_memory_size). This logic needs a relook if and
1144 * when RMA_START changes to a non-zero value.
1146 BUILD_BUG_ON(RMA_START
!= 0);
1147 if (start
< fw_dump
.boot_memory_size
) {
1148 if (end
> fw_dump
.boot_memory_size
)
1149 start
= fw_dump
.boot_memory_size
;
1154 /* add this range excluding the reserved dump area. */
1155 ret
= fadump_exclude_reserved_area(start
, end
);
1164 * If the given physical address falls within the boot memory region then
1165 * return the relocated address that points to the dump region reserved
1166 * for saving initial boot memory contents.
1168 static inline unsigned long fadump_relocate(unsigned long paddr
)
1170 if (paddr
> RMA_START
&& paddr
< fw_dump
.boot_memory_size
)
1171 return be64_to_cpu(fdm
.rmr_region
.destination_address
) + paddr
;
1176 static int fadump_create_elfcore_headers(char *bufp
)
1179 struct elf_phdr
*phdr
;
1182 fadump_init_elfcore_header(bufp
);
1183 elf
= (struct elfhdr
*)bufp
;
1184 bufp
+= sizeof(struct elfhdr
);
1187 * setup ELF PT_NOTE, place holder for cpu notes info. The notes info
1188 * will be populated during second kernel boot after crash. Hence
1189 * this PT_NOTE will always be the first elf note.
1191 * NOTE: Any new ELF note addition should be placed after this note.
1193 phdr
= (struct elf_phdr
*)bufp
;
1194 bufp
+= sizeof(struct elf_phdr
);
1195 phdr
->p_type
= PT_NOTE
;
1207 /* setup ELF PT_NOTE for vmcoreinfo */
1208 phdr
= (struct elf_phdr
*)bufp
;
1209 bufp
+= sizeof(struct elf_phdr
);
1210 phdr
->p_type
= PT_NOTE
;
1215 phdr
->p_paddr
= fadump_relocate(paddr_vmcoreinfo_note());
1216 phdr
->p_offset
= phdr
->p_paddr
;
1217 phdr
->p_memsz
= phdr
->p_filesz
= VMCOREINFO_NOTE_SIZE
;
1219 /* Increment number of program headers. */
1222 /* setup PT_LOAD sections. */
1224 for (i
= 0; i
< crash_mem_ranges
; i
++) {
1225 unsigned long long mbase
, msize
;
1226 mbase
= crash_memory_ranges
[i
].base
;
1227 msize
= crash_memory_ranges
[i
].size
;
1232 phdr
= (struct elf_phdr
*)bufp
;
1233 bufp
+= sizeof(struct elf_phdr
);
1234 phdr
->p_type
= PT_LOAD
;
1235 phdr
->p_flags
= PF_R
|PF_W
|PF_X
;
1236 phdr
->p_offset
= mbase
;
1238 if (mbase
== RMA_START
) {
1240 * The entire RMA region will be moved by firmware
1241 * to the specified destination_address. Hence set
1242 * the correct offset.
1244 phdr
->p_offset
= be64_to_cpu(fdm
.rmr_region
.destination_address
);
1247 phdr
->p_paddr
= mbase
;
1248 phdr
->p_vaddr
= (unsigned long)__va(mbase
);
1249 phdr
->p_filesz
= msize
;
1250 phdr
->p_memsz
= msize
;
1253 /* Increment number of program headers. */
1259 static unsigned long init_fadump_header(unsigned long addr
)
1261 struct fadump_crash_info_header
*fdh
;
1266 fw_dump
.fadumphdr_addr
= addr
;
1268 addr
+= sizeof(struct fadump_crash_info_header
);
1270 memset(fdh
, 0, sizeof(struct fadump_crash_info_header
));
1271 fdh
->magic_number
= FADUMP_CRASH_INFO_MAGIC
;
1272 fdh
->elfcorehdr_addr
= addr
;
1273 /* We will set the crashing cpu id in crash_fadump() during crash. */
1274 fdh
->crashing_cpu
= CPU_UNKNOWN
;
1279 static int register_fadump(void)
1286 * If no memory is reserved then we can not register for firmware-
1289 if (!fw_dump
.reserve_dump_area_size
)
1292 ret
= fadump_setup_crash_memory_ranges();
1296 addr
= be64_to_cpu(fdm
.rmr_region
.destination_address
) + be64_to_cpu(fdm
.rmr_region
.source_len
);
1297 /* Initialize fadump crash info header. */
1298 addr
= init_fadump_header(addr
);
1301 pr_debug("Creating ELF core headers at %#016lx\n", addr
);
1302 fadump_create_elfcore_headers(vaddr
);
1304 /* register the future kernel dump with firmware. */
1305 return register_fw_dump(&fdm
);
1308 static int fadump_unregister_dump(struct fadump_mem_struct
*fdm
)
1311 unsigned int wait_time
;
1313 pr_debug("Un-register firmware-assisted dump\n");
1315 /* TODO: Add upper time limit for the delay */
1317 rc
= rtas_call(fw_dump
.ibm_configure_kernel_dump
, 3, 1, NULL
,
1318 FADUMP_UNREGISTER
, fdm
,
1319 sizeof(struct fadump_mem_struct
));
1321 wait_time
= rtas_busy_delay_time(rc
);
1324 } while (wait_time
);
1327 printk(KERN_ERR
"Failed to un-register firmware-assisted dump."
1328 " unexpected error(%d).\n", rc
);
1331 fw_dump
.dump_registered
= 0;
1335 static int fadump_invalidate_dump(const struct fadump_mem_struct
*fdm
)
1338 unsigned int wait_time
;
1340 pr_debug("Invalidating firmware-assisted dump registration\n");
1342 /* TODO: Add upper time limit for the delay */
1344 rc
= rtas_call(fw_dump
.ibm_configure_kernel_dump
, 3, 1, NULL
,
1345 FADUMP_INVALIDATE
, fdm
,
1346 sizeof(struct fadump_mem_struct
));
1348 wait_time
= rtas_busy_delay_time(rc
);
1351 } while (wait_time
);
1354 pr_err("Failed to invalidate firmware-assisted dump registration. Unexpected error (%d).\n", rc
);
1357 fw_dump
.dump_active
= 0;
1362 void fadump_cleanup(void)
1364 /* Invalidate the registration only if dump is active. */
1365 if (fw_dump
.dump_active
) {
1366 /* pass the same memory dump structure provided by platform */
1367 fadump_invalidate_dump(fdm_active
);
1368 } else if (fw_dump
.dump_registered
) {
1369 /* Un-register Firmware-assisted dump if it was registered. */
1370 fadump_unregister_dump(&fdm
);
1371 free_crash_memory_ranges();
1375 static void fadump_free_reserved_memory(unsigned long start_pfn
,
1376 unsigned long end_pfn
)
1379 unsigned long time_limit
= jiffies
+ HZ
;
1381 pr_info("freeing reserved memory (0x%llx - 0x%llx)\n",
1382 PFN_PHYS(start_pfn
), PFN_PHYS(end_pfn
));
1384 for (pfn
= start_pfn
; pfn
< end_pfn
; pfn
++) {
1385 free_reserved_page(pfn_to_page(pfn
));
1387 if (time_after(jiffies
, time_limit
)) {
1389 time_limit
= jiffies
+ HZ
;
1395 * Skip memory holes and free memory that was actually reserved.
1397 static void fadump_release_reserved_area(unsigned long start
, unsigned long end
)
1399 struct memblock_region
*reg
;
1400 unsigned long tstart
, tend
;
1401 unsigned long start_pfn
= PHYS_PFN(start
);
1402 unsigned long end_pfn
= PHYS_PFN(end
);
1404 for_each_memblock(memory
, reg
) {
1405 tstart
= max(start_pfn
, memblock_region_memory_base_pfn(reg
));
1406 tend
= min(end_pfn
, memblock_region_memory_end_pfn(reg
));
1407 if (tstart
< tend
) {
1408 fadump_free_reserved_memory(tstart
, tend
);
1410 if (tend
== end_pfn
)
1413 start_pfn
= tend
+ 1;
1419 * Release the memory that was reserved in early boot to preserve the memory
1420 * contents. The released memory will be available for general use.
1422 static void fadump_release_memory(unsigned long begin
, unsigned long end
)
1424 unsigned long ra_start
, ra_end
;
1426 ra_start
= fw_dump
.reserve_dump_area_start
;
1427 ra_end
= ra_start
+ fw_dump
.reserve_dump_area_size
;
1430 * exclude the dump reserve area. Will reuse it for next
1431 * fadump registration.
1433 if (begin
< ra_end
&& end
> ra_start
) {
1434 if (begin
< ra_start
)
1435 fadump_release_reserved_area(begin
, ra_start
);
1437 fadump_release_reserved_area(ra_end
, end
);
1439 fadump_release_reserved_area(begin
, end
);
1442 static void fadump_invalidate_release_mem(void)
1444 unsigned long reserved_area_start
, reserved_area_end
;
1445 unsigned long destination_address
;
1447 mutex_lock(&fadump_mutex
);
1448 if (!fw_dump
.dump_active
) {
1449 mutex_unlock(&fadump_mutex
);
1453 destination_address
= be64_to_cpu(fdm_active
->cpu_state_data
.destination_address
);
1455 mutex_unlock(&fadump_mutex
);
1458 * Save the current reserved memory bounds we will require them
1459 * later for releasing the memory for general use.
1461 reserved_area_start
= fw_dump
.reserve_dump_area_start
;
1462 reserved_area_end
= reserved_area_start
+
1463 fw_dump
.reserve_dump_area_size
;
1465 * Setup reserve_dump_area_start and its size so that we can
1466 * reuse this reserved memory for Re-registration.
1468 fw_dump
.reserve_dump_area_start
= destination_address
;
1469 fw_dump
.reserve_dump_area_size
= get_fadump_area_size();
1471 fadump_release_memory(reserved_area_start
, reserved_area_end
);
1472 if (fw_dump
.cpu_notes_buf
) {
1473 fadump_cpu_notes_buf_free(
1474 (unsigned long)__va(fw_dump
.cpu_notes_buf
),
1475 fw_dump
.cpu_notes_buf_size
);
1476 fw_dump
.cpu_notes_buf
= 0;
1477 fw_dump
.cpu_notes_buf_size
= 0;
1479 /* Initialize the kernel dump memory structure for FAD registration. */
1480 init_fadump_mem_struct(&fdm
, fw_dump
.reserve_dump_area_start
);
1483 static ssize_t
fadump_release_memory_store(struct kobject
*kobj
,
1484 struct kobj_attribute
*attr
,
1485 const char *buf
, size_t count
)
1489 if (!fw_dump
.dump_active
)
1492 if (kstrtoint(buf
, 0, &input
))
1497 * Take away the '/proc/vmcore'. We are releasing the dump
1498 * memory, hence it will not be valid anymore.
1500 #ifdef CONFIG_PROC_VMCORE
1503 fadump_invalidate_release_mem();
1510 static ssize_t
fadump_enabled_show(struct kobject
*kobj
,
1511 struct kobj_attribute
*attr
,
1514 return sprintf(buf
, "%d\n", fw_dump
.fadump_enabled
);
1517 static ssize_t
fadump_register_show(struct kobject
*kobj
,
1518 struct kobj_attribute
*attr
,
1521 return sprintf(buf
, "%d\n", fw_dump
.dump_registered
);
1524 static ssize_t
fadump_register_store(struct kobject
*kobj
,
1525 struct kobj_attribute
*attr
,
1526 const char *buf
, size_t count
)
1531 if (!fw_dump
.fadump_enabled
|| fdm_active
)
1534 if (kstrtoint(buf
, 0, &input
))
1537 mutex_lock(&fadump_mutex
);
1541 if (fw_dump
.dump_registered
== 0) {
1544 /* Un-register Firmware-assisted dump */
1545 fadump_unregister_dump(&fdm
);
1548 if (fw_dump
.dump_registered
== 1) {
1549 /* Un-register Firmware-assisted dump */
1550 fadump_unregister_dump(&fdm
);
1552 /* Register Firmware-assisted dump */
1553 ret
= register_fadump();
1561 mutex_unlock(&fadump_mutex
);
1562 return ret
< 0 ? ret
: count
;
1565 static int fadump_region_show(struct seq_file
*m
, void *private)
1567 const struct fadump_mem_struct
*fdm_ptr
;
1569 if (!fw_dump
.fadump_enabled
)
1572 mutex_lock(&fadump_mutex
);
1574 fdm_ptr
= fdm_active
;
1576 mutex_unlock(&fadump_mutex
);
1581 "CPU : [%#016llx-%#016llx] %#llx bytes, "
1583 be64_to_cpu(fdm_ptr
->cpu_state_data
.destination_address
),
1584 be64_to_cpu(fdm_ptr
->cpu_state_data
.destination_address
) +
1585 be64_to_cpu(fdm_ptr
->cpu_state_data
.source_len
) - 1,
1586 be64_to_cpu(fdm_ptr
->cpu_state_data
.source_len
),
1587 be64_to_cpu(fdm_ptr
->cpu_state_data
.bytes_dumped
));
1589 "HPTE: [%#016llx-%#016llx] %#llx bytes, "
1591 be64_to_cpu(fdm_ptr
->hpte_region
.destination_address
),
1592 be64_to_cpu(fdm_ptr
->hpte_region
.destination_address
) +
1593 be64_to_cpu(fdm_ptr
->hpte_region
.source_len
) - 1,
1594 be64_to_cpu(fdm_ptr
->hpte_region
.source_len
),
1595 be64_to_cpu(fdm_ptr
->hpte_region
.bytes_dumped
));
1597 "DUMP: [%#016llx-%#016llx] %#llx bytes, "
1599 be64_to_cpu(fdm_ptr
->rmr_region
.destination_address
),
1600 be64_to_cpu(fdm_ptr
->rmr_region
.destination_address
) +
1601 be64_to_cpu(fdm_ptr
->rmr_region
.source_len
) - 1,
1602 be64_to_cpu(fdm_ptr
->rmr_region
.source_len
),
1603 be64_to_cpu(fdm_ptr
->rmr_region
.bytes_dumped
));
1606 (fw_dump
.reserve_dump_area_start
==
1607 be64_to_cpu(fdm_ptr
->cpu_state_data
.destination_address
)))
1610 /* Dump is active. Show reserved memory region. */
1612 " : [%#016llx-%#016llx] %#llx bytes, "
1614 (unsigned long long)fw_dump
.reserve_dump_area_start
,
1615 be64_to_cpu(fdm_ptr
->cpu_state_data
.destination_address
) - 1,
1616 be64_to_cpu(fdm_ptr
->cpu_state_data
.destination_address
) -
1617 fw_dump
.reserve_dump_area_start
,
1618 be64_to_cpu(fdm_ptr
->cpu_state_data
.destination_address
) -
1619 fw_dump
.reserve_dump_area_start
);
1622 mutex_unlock(&fadump_mutex
);
1626 static struct kobj_attribute fadump_release_attr
= __ATTR(fadump_release_mem
,
1628 fadump_release_memory_store
);
1629 static struct kobj_attribute fadump_attr
= __ATTR(fadump_enabled
,
1630 0444, fadump_enabled_show
,
1632 static struct kobj_attribute fadump_register_attr
= __ATTR(fadump_registered
,
1633 0644, fadump_register_show
,
1634 fadump_register_store
);
1636 DEFINE_SHOW_ATTRIBUTE(fadump_region
);
1638 static void fadump_init_files(void)
1640 struct dentry
*debugfs_file
;
1643 rc
= sysfs_create_file(kernel_kobj
, &fadump_attr
.attr
);
1645 printk(KERN_ERR
"fadump: unable to create sysfs file"
1646 " fadump_enabled (%d)\n", rc
);
1648 rc
= sysfs_create_file(kernel_kobj
, &fadump_register_attr
.attr
);
1650 printk(KERN_ERR
"fadump: unable to create sysfs file"
1651 " fadump_registered (%d)\n", rc
);
1653 debugfs_file
= debugfs_create_file("fadump_region", 0444,
1654 powerpc_debugfs_root
, NULL
,
1655 &fadump_region_fops
);
1657 printk(KERN_ERR
"fadump: unable to create debugfs file"
1658 " fadump_region\n");
1660 if (fw_dump
.dump_active
) {
1661 rc
= sysfs_create_file(kernel_kobj
, &fadump_release_attr
.attr
);
1663 printk(KERN_ERR
"fadump: unable to create sysfs file"
1664 " fadump_release_mem (%d)\n", rc
);
1670 * Prepare for firmware-assisted dump.
1672 int __init
setup_fadump(void)
1674 if (!fw_dump
.fadump_enabled
)
1677 if (!fw_dump
.fadump_supported
) {
1678 printk(KERN_ERR
"Firmware-assisted dump is not supported on"
1679 " this hardware\n");
1683 fadump_show_config();
1685 * If dump data is available then see if it is valid and prepare for
1686 * saving it to the disk.
1688 if (fw_dump
.dump_active
) {
1690 * if dump process fails then invalidate the registration
1691 * and release memory before proceeding for re-registration.
1693 if (process_fadump(fdm_active
) < 0)
1694 fadump_invalidate_release_mem();
1696 /* Initialize the kernel dump memory structure for FAD registration. */
1697 else if (fw_dump
.reserve_dump_area_size
)
1698 init_fadump_mem_struct(&fdm
, fw_dump
.reserve_dump_area_start
);
1699 fadump_init_files();
1703 subsys_initcall(setup_fadump
);