projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Merge branch 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / arch / powerpc / kernel / fadump.c
CommitLineData
eb39c880
MS		 1/*
2 * Firmware Assisted dump: A robust mechanism to get reliable kernel crash
3 * dump with assistance from firmware. This approach does not use kexec,
4 * instead firmware assists in booting the kdump kernel while preserving
5 * memory contents. The most of the code implementation has been adapted
6 * from phyp assisted dump implementation written by Linas Vepstas and
7 * Manish Ahuja
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 *
23 * Copyright 2011 IBM Corporation
24 * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
25 */
26
27#undef DEBUG
28#define pr_fmt(fmt) "fadump: " fmt
29
30#include <linux/string.h>
31#include <linux/memblock.h>
3ccc00a7
MS		 32#include <linux/delay.h>
33#include <linux/debugfs.h>
34#include <linux/seq_file.h>
2df173d9 35#include <linux/crash_dump.h>
b500afff
MS		 36#include <linux/kobject.h>
37#include <linux/sysfs.h>
eb39c880
MS		 38
39#include <asm/page.h>
40#include <asm/prom.h>
41#include <asm/rtas.h>
42#include <asm/fadump.h>
cad3c834
SR		 43#include <asm/debug.h>
44#include <asm/setup.h>
eb39c880
MS		 45
46static struct fw_dump fw_dump;
3ccc00a7
MS		 47static struct fadump_mem_struct fdm;
48static const struct fadump_mem_struct *fdm_active;
49
50static DEFINE_MUTEX(fadump_mutex);
2df173d9
MS		 51struct fad_crash_memory_ranges crash_memory_ranges[INIT_CRASHMEM_RANGES];
52int crash_mem_ranges;
eb39c880
MS		 53
54/* Scan the Firmware Assisted dump configuration details. */
55int __init early_init_dt_scan_fw_dump(unsigned long node,
56 const char *uname, int depth, void *data)
57{
9d0c4dfe 58 const __be32 *sections;
eb39c880 59 int i, num_sections;
9d0c4dfe 60 int size;
408cddd9 61 const __be32 *token;
eb39c880
MS		 62
63 if (depth != 1 || strcmp(uname, "rtas") != 0)
64 return 0;
65
66 /*
67 * Check if Firmware Assisted dump is supported. if yes, check
68 * if dump has been initiated on last reboot.
69 */
70 token = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL);
71 if (!token)
a7d04317 72 return 1;
eb39c880
MS		 73
74 fw_dump.fadump_supported = 1;
408cddd9 75 fw_dump.ibm_configure_kernel_dump = be32_to_cpu(*token);
eb39c880
MS		 76
77 /*
78 * The 'ibm,kernel-dump' rtas node is present only if there is
79 * dump data waiting for us.
80 */
3ccc00a7
MS		 81 fdm_active = of_get_flat_dt_prop(node, "ibm,kernel-dump", NULL);
82 if (fdm_active)
eb39c880
MS		 83 fw_dump.dump_active = 1;
84
85 /* Get the sizes required to store dump data for the firmware provided
86 * dump sections.
87 * For each dump section type supported, a 32bit cell which defines
88 * the ID of a supported section followed by two 32 bit cells which
89 * gives teh size of the section in bytes.
90 */
91 sections = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes",
92 &size);
93
94 if (!sections)
a7d04317 95 return 1;
eb39c880
MS		 96
97 num_sections = size / (3 * sizeof(u32));
98
99 for (i = 0; i < num_sections; i++, sections += 3) {
100 u32 type = (u32)of_read_number(sections, 1);
101
102 switch (type) {
103 case FADUMP_CPU_STATE_DATA:
104 fw_dump.cpu_state_data_size =
105 of_read_ulong(&sections[1], 2);
106 break;
107 case FADUMP_HPTE_REGION:
108 fw_dump.hpte_region_size =
109 of_read_ulong(&sections[1], 2);
110 break;
111 }
112 }
a7d04317 113
eb39c880
MS		 114 return 1;
115}
116
3ccc00a7
MS		 117int is_fadump_active(void)
118{
119 return fw_dump.dump_active;
120}
121
122/* Print firmware assisted dump configurations for debugging purpose. */
123static void fadump_show_config(void)
124{
125 pr_debug("Support for firmware-assisted dump (fadump): %s\n",
126 (fw_dump.fadump_supported ? "present" : "no support"));
127
128 if (!fw_dump.fadump_supported)
129 return;
130
131 pr_debug("Fadump enabled : %s\n",
132 (fw_dump.fadump_enabled ? "yes" : "no"));
133 pr_debug("Dump Active : %s\n",
134 (fw_dump.dump_active ? "yes" : "no"));
135 pr_debug("Dump section sizes:\n");
136 pr_debug(" CPU state data size: %lx\n", fw_dump.cpu_state_data_size);
137 pr_debug(" HPTE region size : %lx\n", fw_dump.hpte_region_size);
138 pr_debug("Boot memory size : %lx\n", fw_dump.boot_memory_size);
139}
140
141static unsigned long init_fadump_mem_struct(struct fadump_mem_struct *fdm,
142 unsigned long addr)
143{
144 if (!fdm)
145 return 0;
146
147 memset(fdm, 0, sizeof(struct fadump_mem_struct));
148 addr = addr & PAGE_MASK;
149
408cddd9
HB		 150 fdm->header.dump_format_version = cpu_to_be32(0x00000001);
151 fdm->header.dump_num_sections = cpu_to_be16(3);
3ccc00a7
MS		 152 fdm->header.dump_status_flag = 0;
153 fdm->header.offset_first_dump_section =
408cddd9 154 cpu_to_be32((u32)offsetof(struct fadump_mem_struct, cpu_state_data));
3ccc00a7
MS		 155
156 /*
157 * Fields for disk dump option.
158 * We are not using disk dump option, hence set these fields to 0.
159 */
160 fdm->header.dd_block_size = 0;
161 fdm->header.dd_block_offset = 0;
162 fdm->header.dd_num_blocks = 0;
163 fdm->header.dd_offset_disk_path = 0;
164
165 /* set 0 to disable an automatic dump-reboot. */
166 fdm->header.max_time_auto = 0;
167
168 /* Kernel dump sections */
169 /* cpu state data section. */
408cddd9
HB		 170 fdm->cpu_state_data.request_flag = cpu_to_be32(FADUMP_REQUEST_FLAG);
171 fdm->cpu_state_data.source_data_type = cpu_to_be16(FADUMP_CPU_STATE_DATA);
3ccc00a7 172 fdm->cpu_state_data.source_address = 0;
408cddd9
HB		 173 fdm->cpu_state_data.source_len = cpu_to_be64(fw_dump.cpu_state_data_size);
174 fdm->cpu_state_data.destination_address = cpu_to_be64(addr);
3ccc00a7
MS		 175 addr += fw_dump.cpu_state_data_size;
176
177 /* hpte region section */
408cddd9
HB		 178 fdm->hpte_region.request_flag = cpu_to_be32(FADUMP_REQUEST_FLAG);
179 fdm->hpte_region.source_data_type = cpu_to_be16(FADUMP_HPTE_REGION);
3ccc00a7 180 fdm->hpte_region.source_address = 0;
408cddd9
HB		 181 fdm->hpte_region.source_len = cpu_to_be64(fw_dump.hpte_region_size);
182 fdm->hpte_region.destination_address = cpu_to_be64(addr);
3ccc00a7
MS		 183 addr += fw_dump.hpte_region_size;
184
185 /* RMA region section */
408cddd9
HB		 186 fdm->rmr_region.request_flag = cpu_to_be32(FADUMP_REQUEST_FLAG);
187 fdm->rmr_region.source_data_type = cpu_to_be16(FADUMP_REAL_MODE_REGION);
188 fdm->rmr_region.source_address = cpu_to_be64(RMA_START);
189 fdm->rmr_region.source_len = cpu_to_be64(fw_dump.boot_memory_size);
190 fdm->rmr_region.destination_address = cpu_to_be64(addr);
3ccc00a7
MS		 191 addr += fw_dump.boot_memory_size;
192
193 return addr;
194}
195
eb39c880
MS		 196/**
197 * fadump_calculate_reserve_size(): reserve variable boot area 5% of System RAM
198 *
199 * Function to find the largest memory size we need to reserve during early
200 * boot process. This will be the size of the memory that is required for a
201 * kernel to boot successfully.
202 *
203 * This function has been taken from phyp-assisted dump feature implementation.
204 *
205 * returns larger of 256MB or 5% rounded down to multiples of 256MB.
206 *
207 * TODO: Come up with better approach to find out more accurate memory size
208 * that is required for a kernel to boot successfully.
209 *
210 */
211static inline unsigned long fadump_calculate_reserve_size(void)
212{
213 unsigned long size;
214
215 /*
216 * Check if the size is specified through fadump_reserve_mem= cmdline
217 * option. If yes, then use that.
218 */
219 if (fw_dump.reserve_bootvar)
220 return fw_dump.reserve_bootvar;
221
222 /* divide by 20 to get 5% of value */
223 size = memblock_end_of_DRAM() / 20;
224
225 /* round it down in multiples of 256 */
226 size = size & ~0x0FFFFFFFUL;
227
228 /* Truncate to memory_limit. We don't want to over reserve the memory.*/
229 if (memory_limit && size > memory_limit)
230 size = memory_limit;
231
232 return (size > MIN_BOOT_MEM ? size : MIN_BOOT_MEM);
233}
234
235/*
236 * Calculate the total memory size required to be reserved for
237 * firmware-assisted dump registration.
238 */
239static unsigned long get_fadump_area_size(void)
240{
241 unsigned long size = 0;
242
243 size += fw_dump.cpu_state_data_size;
244 size += fw_dump.hpte_region_size;
245 size += fw_dump.boot_memory_size;
2df173d9
MS		 246 size += sizeof(struct fadump_crash_info_header);
247 size += sizeof(struct elfhdr); /* ELF core header.*/
ebaeb5ae 248 size += sizeof(struct elf_phdr); /* place holder for cpu notes */
2df173d9
MS		 249 /* Program headers for crash memory regions. */
250 size += sizeof(struct elf_phdr) * (memblock_num_regions(memory) + 2);
eb39c880
MS		 251
252 size = PAGE_ALIGN(size);
253 return size;
254}
255
256int __init fadump_reserve_mem(void)
257{
258 unsigned long base, size, memory_boundary;
259
260 if (!fw_dump.fadump_enabled)
261 return 0;
262
263 if (!fw_dump.fadump_supported) {
264 printk(KERN_INFO "Firmware-assisted dump is not supported on"
265 " this hardware\n");
266 fw_dump.fadump_enabled = 0;
267 return 0;
268 }
3ccc00a7
MS		 269 /*
270 * Initialize boot memory size
271 * If dump is active then we have already calculated the size during
272 * first kernel.
273 */
274 if (fdm_active)
408cddd9 275 fw_dump.boot_memory_size = be64_to_cpu(fdm_active->rmr_region.source_len);
3ccc00a7
MS		 276 else
277 fw_dump.boot_memory_size = fadump_calculate_reserve_size();
eb39c880
MS		 278
279 /*
280 * Calculate the memory boundary.
281 * If memory_limit is less than actual memory boundary then reserve
282 * the memory for fadump beyond the memory_limit and adjust the
283 * memory_limit accordingly, so that the running kernel can run with
284 * specified memory_limit.
285 */
286 if (memory_limit && memory_limit < memblock_end_of_DRAM()) {
287 size = get_fadump_area_size();
288 if ((memory_limit + size) < memblock_end_of_DRAM())
289 memory_limit += size;
290 else
291 memory_limit = memblock_end_of_DRAM();
292 printk(KERN_INFO "Adjusted memory_limit for firmware-assisted"
a84fcd46 293 " dump, now %#016llx\n", memory_limit);
eb39c880
MS		 294 }
295 if (memory_limit)
296 memory_boundary = memory_limit;
297 else
298 memory_boundary = memblock_end_of_DRAM();
299
300 if (fw_dump.dump_active) {
301 printk(KERN_INFO "Firmware-assisted dump is active.\n");
302 /*
303 * If last boot has crashed then reserve all the memory
304 * above boot_memory_size so that we don't touch it until
305 * dump is written to disk by userspace tool. This memory
306 * will be released for general use once the dump is saved.
307 */
308 base = fw_dump.boot_memory_size;
309 size = memory_boundary - base;
310 memblock_reserve(base, size);
311 printk(KERN_INFO "Reserved %ldMB of memory at %ldMB "
312 "for saving crash dump\n",
313 (unsigned long)(size >> 20),
314 (unsigned long)(base >> 20));
2df173d9
MS		 315
316 fw_dump.fadumphdr_addr =
408cddd9
HB		 317 be64_to_cpu(fdm_active->rmr_region.destination_address) +
318 be64_to_cpu(fdm_active->rmr_region.source_len);
2df173d9
MS		 319 pr_debug("fadumphdr_addr = %p\n",
320 (void *) fw_dump.fadumphdr_addr);
eb39c880
MS		 321 } else {
322 /* Reserve the memory at the top of memory. */
323 size = get_fadump_area_size();
324 base = memory_boundary - size;
325 memblock_reserve(base, size);
326 printk(KERN_INFO "Reserved %ldMB of memory at %ldMB "
327 "for firmware-assisted dump\n",
328 (unsigned long)(size >> 20),
329 (unsigned long)(base >> 20));
330 }
331 fw_dump.reserve_dump_area_start = base;
332 fw_dump.reserve_dump_area_size = size;
333 return 1;
334}
335
336/* Look for fadump= cmdline option. */
337static int __init early_fadump_param(char *p)
338{
339 if (!p)
340 return 1;
341
342 if (strncmp(p, "on", 2) == 0)
343 fw_dump.fadump_enabled = 1;
344 else if (strncmp(p, "off", 3) == 0)
345 fw_dump.fadump_enabled = 0;
346
347 return 0;
348}
349early_param("fadump", early_fadump_param);
350
351/* Look for fadump_reserve_mem= cmdline option */
352static int __init early_fadump_reserve_mem(char *p)
353{
354 if (p)
355 fw_dump.reserve_bootvar = memparse(p, &p);
356 return 0;
357}
358early_param("fadump_reserve_mem", early_fadump_reserve_mem);
3ccc00a7
MS		 359
360static void register_fw_dump(struct fadump_mem_struct *fdm)
361{
362 int rc;
363 unsigned int wait_time;
364
365 pr_debug("Registering for firmware-assisted kernel dump...\n");
366
367 /* TODO: Add upper time limit for the delay */
368 do {
369 rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
370 FADUMP_REGISTER, fdm,
371 sizeof(struct fadump_mem_struct));
372
373 wait_time = rtas_busy_delay_time(rc);
374 if (wait_time)
375 mdelay(wait_time);
376
377 } while (wait_time);
378
379 switch (rc) {
380 case -1:
381 printk(KERN_ERR "Failed to register firmware-assisted kernel"
382 " dump. Hardware Error(%d).\n", rc);
383 break;
384 case -3:
385 printk(KERN_ERR "Failed to register firmware-assisted kernel"
386 " dump. Parameter Error(%d).\n", rc);
387 break;
388 case -9:
389 printk(KERN_ERR "firmware-assisted kernel dump is already "
390 " registered.");
391 fw_dump.dump_registered = 1;
392 break;
393 case 0:
394 printk(KERN_INFO "firmware-assisted kernel dump registration"
395 " is successful\n");
396 fw_dump.dump_registered = 1;
397 break;
398 }
399}
400
ebaeb5ae
MS		 401void crash_fadump(struct pt_regs *regs, const char *str)
402{
403 struct fadump_crash_info_header *fdh = NULL;
404
405 if (!fw_dump.dump_registered || !fw_dump.fadumphdr_addr)
406 return;
407
408 fdh = __va(fw_dump.fadumphdr_addr);
409 crashing_cpu = smp_processor_id();
410 fdh->crashing_cpu = crashing_cpu;
411 crash_save_vmcoreinfo();
412
413 if (regs)
414 fdh->regs = *regs;
415 else
416 ppc_save_regs(&fdh->regs);
417
a0512164 418 fdh->online_mask = *cpu_online_mask;
ebaeb5ae
MS		 419
420 /* Call ibm,os-term rtas call to trigger firmware assisted dump */
421 rtas_os_term((char *)str);
422}
423
424#define GPR_MASK 0xffffff0000000000
425static inline int fadump_gpr_index(u64 id)
426{
427 int i = -1;
428 char str[3];
429
430 if ((id & GPR_MASK) == REG_ID("GPR")) {
431 /* get the digits at the end */
432 id &= ~GPR_MASK;
433 id >>= 24;
434 str[2] = '\0';
435 str[1] = id & 0xff;
436 str[0] = (id >> 8) & 0xff;
437 sscanf(str, "%d", &i);
438 if (i > 31)
439 i = -1;
440 }
441 return i;
442}
443
444static inline void fadump_set_regval(struct pt_regs *regs, u64 reg_id,
445 u64 reg_val)
446{
447 int i;
448
449 i = fadump_gpr_index(reg_id);
450 if (i >= 0)
451 regs->gpr[i] = (unsigned long)reg_val;
452 else if (reg_id == REG_ID("NIA"))
453 regs->nip = (unsigned long)reg_val;
454 else if (reg_id == REG_ID("MSR"))
455 regs->msr = (unsigned long)reg_val;
456 else if (reg_id == REG_ID("CTR"))
457 regs->ctr = (unsigned long)reg_val;
458 else if (reg_id == REG_ID("LR"))
459 regs->link = (unsigned long)reg_val;
460 else if (reg_id == REG_ID("XER"))
461 regs->xer = (unsigned long)reg_val;
462 else if (reg_id == REG_ID("CR"))
463 regs->ccr = (unsigned long)reg_val;
464 else if (reg_id == REG_ID("DAR"))
465 regs->dar = (unsigned long)reg_val;
466 else if (reg_id == REG_ID("DSISR"))
467 regs->dsisr = (unsigned long)reg_val;
468}
469
470static struct fadump_reg_entry*
471fadump_read_registers(struct fadump_reg_entry *reg_entry, struct pt_regs *regs)
472{
473 memset(regs, 0, sizeof(struct pt_regs));
474
408cddd9
HB		 475 while (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUEND")) {
476 fadump_set_regval(regs, be64_to_cpu(reg_entry->reg_id),
477 be64_to_cpu(reg_entry->reg_value));
ebaeb5ae
MS		 478 reg_entry++;
479 }
480 reg_entry++;
481 return reg_entry;
482}
483
484static u32 *fadump_append_elf_note(u32 *buf, char *name, unsigned type,
485 void *data, size_t data_len)
486{
487 struct elf_note note;
488
489 note.n_namesz = strlen(name) + 1;
490 note.n_descsz = data_len;
491 note.n_type = type;
492 memcpy(buf, &note, sizeof(note));
493 buf += (sizeof(note) + 3)/4;
494 memcpy(buf, name, note.n_namesz);
495 buf += (note.n_namesz + 3)/4;
496 memcpy(buf, data, note.n_descsz);
497 buf += (note.n_descsz + 3)/4;
498
499 return buf;
500}
501
502static void fadump_final_note(u32 *buf)
503{
504 struct elf_note note;
505
506 note.n_namesz = 0;
507 note.n_descsz = 0;
508 note.n_type = 0;
509 memcpy(buf, &note, sizeof(note));
510}
511
512static u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs)
513{
514 struct elf_prstatus prstatus;
515
516 memset(&prstatus, 0, sizeof(prstatus));
517 /*
518 * FIXME: How do i get PID? Do I really need it?
519 * prstatus.pr_pid = ????
520 */
521 elf_core_copy_kernel_regs(&prstatus.pr_reg, regs);
522 buf = fadump_append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
523 &prstatus, sizeof(prstatus));
524 return buf;
525}
526
527static void fadump_update_elfcore_header(char *bufp)
528{
529 struct elfhdr *elf;
530 struct elf_phdr *phdr;
531
532 elf = (struct elfhdr *)bufp;
533 bufp += sizeof(struct elfhdr);
534
535 /* First note is a place holder for cpu notes info. */
536 phdr = (struct elf_phdr *)bufp;
537
538 if (phdr->p_type == PT_NOTE) {
539 phdr->p_paddr = fw_dump.cpu_notes_buf;
540 phdr->p_offset = phdr->p_paddr;
541 phdr->p_filesz = fw_dump.cpu_notes_buf_size;
542 phdr->p_memsz = fw_dump.cpu_notes_buf_size;
543 }
544 return;
545}
546
547static void *fadump_cpu_notes_buf_alloc(unsigned long size)
548{
549 void *vaddr;
550 struct page *page;
551 unsigned long order, count, i;
552
553 order = get_order(size);
554 vaddr = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, order);
555 if (!vaddr)
556 return NULL;
557
558 count = 1 << order;
559 page = virt_to_page(vaddr);
560 for (i = 0; i < count; i++)
561 SetPageReserved(page + i);
562 return vaddr;
563}
564
565static void fadump_cpu_notes_buf_free(unsigned long vaddr, unsigned long size)
566{
567 struct page *page;
568 unsigned long order, count, i;
569
570 order = get_order(size);
571 count = 1 << order;
572 page = virt_to_page(vaddr);
573 for (i = 0; i < count; i++)
574 ClearPageReserved(page + i);
575 __free_pages(page, order);
576}
577
578/*
579 * Read CPU state dump data and convert it into ELF notes.
580 * The CPU dump starts with magic number "REGSAVE". NumCpusOffset should be
581 * used to access the data to allow for additional fields to be added without
582 * affecting compatibility. Each list of registers for a CPU starts with
583 * "CPUSTRT" and ends with "CPUEND". Each register entry is of 16 bytes,
584 * 8 Byte ASCII identifier and 8 Byte register value. The register entry
585 * with identifier "CPUSTRT" and "CPUEND" contains 4 byte cpu id as part
586 * of register value. For more details refer to PAPR document.
587 *
588 * Only for the crashing cpu we ignore the CPU dump data and get exact
589 * state from fadump crash info structure populated by first kernel at the
590 * time of crash.
591 */
592static int __init fadump_build_cpu_notes(const struct fadump_mem_struct *fdm)
593{
594 struct fadump_reg_save_area_header *reg_header;
595 struct fadump_reg_entry *reg_entry;
596 struct fadump_crash_info_header *fdh = NULL;
597 void *vaddr;
598 unsigned long addr;
599 u32 num_cpus, *note_buf;
600 struct pt_regs regs;
601 int i, rc = 0, cpu = 0;
602
603 if (!fdm->cpu_state_data.bytes_dumped)
604 return -EINVAL;
605
408cddd9 606 addr = be64_to_cpu(fdm->cpu_state_data.destination_address);
ebaeb5ae
MS		 607 vaddr = __va(addr);
608
609 reg_header = vaddr;
408cddd9 610 if (be64_to_cpu(reg_header->magic_number) != REGSAVE_AREA_MAGIC) {
ebaeb5ae
MS		 611 printk(KERN_ERR "Unable to read register save area.\n");
612 return -ENOENT;
613 }
614 pr_debug("--------CPU State Data------------\n");
408cddd9
HB		 615 pr_debug("Magic Number: %llx\n", be64_to_cpu(reg_header->magic_number));
616 pr_debug("NumCpuOffset: %x\n", be32_to_cpu(reg_header->num_cpu_offset));
ebaeb5ae 617
408cddd9
HB		 618 vaddr += be32_to_cpu(reg_header->num_cpu_offset);
619 num_cpus = be32_to_cpu(*((__be32 *)(vaddr)));
ebaeb5ae
MS		 620 pr_debug("NumCpus : %u\n", num_cpus);
621 vaddr += sizeof(u32);
622 reg_entry = (struct fadump_reg_entry *)vaddr;
623
624 /* Allocate buffer to hold cpu crash notes. */
625 fw_dump.cpu_notes_buf_size = num_cpus * sizeof(note_buf_t);
626 fw_dump.cpu_notes_buf_size = PAGE_ALIGN(fw_dump.cpu_notes_buf_size);
627 note_buf = fadump_cpu_notes_buf_alloc(fw_dump.cpu_notes_buf_size);
628 if (!note_buf) {
629 printk(KERN_ERR "Failed to allocate 0x%lx bytes for "
630 "cpu notes buffer\n", fw_dump.cpu_notes_buf_size);
631 return -ENOMEM;
632 }
633 fw_dump.cpu_notes_buf = __pa(note_buf);
634
635 pr_debug("Allocated buffer for cpu notes of size %ld at %p\n",
636 (num_cpus * sizeof(note_buf_t)), note_buf);
637
638 if (fw_dump.fadumphdr_addr)
639 fdh = __va(fw_dump.fadumphdr_addr);
640
641 for (i = 0; i < num_cpus; i++) {
408cddd9 642 if (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUSTRT")) {
ebaeb5ae
MS		 643 printk(KERN_ERR "Unable to read CPU state data\n");
644 rc = -ENOENT;
645 goto error_out;
646 }
647 /* Lower 4 bytes of reg_value contains logical cpu id */
408cddd9 648 cpu = be64_to_cpu(reg_entry->reg_value) & FADUMP_CPU_ID_MASK;
a0512164 649 if (fdh && !cpumask_test_cpu(cpu, &fdh->online_mask)) {
ebaeb5ae
MS		 650 SKIP_TO_NEXT_CPU(reg_entry);
651 continue;
652 }
653 pr_debug("Reading register data for cpu %d...\n", cpu);
654 if (fdh && fdh->crashing_cpu == cpu) {
655 regs = fdh->regs;
656 note_buf = fadump_regs_to_elf_notes(note_buf, &regs);
657 SKIP_TO_NEXT_CPU(reg_entry);
658 } else {
659 reg_entry++;
660 reg_entry = fadump_read_registers(reg_entry, &regs);
661 note_buf = fadump_regs_to_elf_notes(note_buf, &regs);
662 }
663 }
664 fadump_final_note(note_buf);
665
b717d985
RS		 666 if (fdh) {
667 pr_debug("Updating elfcore header (%llx) with cpu notes\n",
ebaeb5ae 668 fdh->elfcorehdr_addr);
b717d985
RS		 669 fadump_update_elfcore_header((char *)__va(fdh->elfcorehdr_addr));
670 }
ebaeb5ae
MS		 671 return 0;
672
673error_out:
674 fadump_cpu_notes_buf_free((unsigned long)__va(fw_dump.cpu_notes_buf),
675 fw_dump.cpu_notes_buf_size);
676 fw_dump.cpu_notes_buf = 0;
677 fw_dump.cpu_notes_buf_size = 0;
678 return rc;
679
680}
681
2df173d9
MS		 682/*
683 * Validate and process the dump data stored by firmware before exporting
684 * it through '/proc/vmcore'.
685 */
686static int __init process_fadump(const struct fadump_mem_struct *fdm_active)
687{
688 struct fadump_crash_info_header *fdh;
ebaeb5ae 689 int rc = 0;
2df173d9
MS		 690
691 if (!fdm_active || !fw_dump.fadumphdr_addr)
692 return -EINVAL;
693
694 /* Check if the dump data is valid. */
408cddd9 695 if ((be16_to_cpu(fdm_active->header.dump_status_flag) == FADUMP_ERROR_FLAG) ||
ebaeb5ae 696 (fdm_active->cpu_state_data.error_flags != 0) ||
2df173d9
MS		 697 (fdm_active->rmr_region.error_flags != 0)) {
698 printk(KERN_ERR "Dump taken by platform is not valid\n");
699 return -EINVAL;
700 }
ebaeb5ae
MS		 701 if ((fdm_active->rmr_region.bytes_dumped !=
702 fdm_active->rmr_region.source_len) ||
703 !fdm_active->cpu_state_data.bytes_dumped) {
2df173d9
MS		 704 printk(KERN_ERR "Dump taken by platform is incomplete\n");
705 return -EINVAL;
706 }
707
708 /* Validate the fadump crash info header */
709 fdh = __va(fw_dump.fadumphdr_addr);
710 if (fdh->magic_number != FADUMP_CRASH_INFO_MAGIC) {
711 printk(KERN_ERR "Crash info header is not valid.\n");
712 return -EINVAL;
713 }
714
ebaeb5ae
MS		 715 rc = fadump_build_cpu_notes(fdm_active);
716 if (rc)
717 return rc;
718
2df173d9
MS		 719 /*
720 * We are done validating dump info and elfcore header is now ready
721 * to be exported. set elfcorehdr_addr so that vmcore module will
722 * export the elfcore header through '/proc/vmcore'.
723 */
724 elfcorehdr_addr = fdh->elfcorehdr_addr;
725
726 return 0;
727}
728
729static inline void fadump_add_crash_memory(unsigned long long base,
730 unsigned long long end)
731{
732 if (base == end)
733 return;
734
735 pr_debug("crash_memory_range[%d] [%#016llx-%#016llx], %#llx bytes\n",
736 crash_mem_ranges, base, end - 1, (end - base));
737 crash_memory_ranges[crash_mem_ranges].base = base;
738 crash_memory_ranges[crash_mem_ranges].size = end - base;
739 crash_mem_ranges++;
740}
741
742static void fadump_exclude_reserved_area(unsigned long long start,
743 unsigned long long end)
744{
745 unsigned long long ra_start, ra_end;
746
747 ra_start = fw_dump.reserve_dump_area_start;
748 ra_end = ra_start + fw_dump.reserve_dump_area_size;
749
750 if ((ra_start < end) && (ra_end > start)) {
751 if ((start < ra_start) && (end > ra_end)) {
752 fadump_add_crash_memory(start, ra_start);
753 fadump_add_crash_memory(ra_end, end);
754 } else if (start < ra_start) {
755 fadump_add_crash_memory(start, ra_start);
756 } else if (ra_end < end) {
757 fadump_add_crash_memory(ra_end, end);
758 }
759 } else
760 fadump_add_crash_memory(start, end);
761}
762
763static int fadump_init_elfcore_header(char *bufp)
764{
765 struct elfhdr *elf;
766
767 elf = (struct elfhdr *) bufp;
768 bufp += sizeof(struct elfhdr);
769 memcpy(elf->e_ident, ELFMAG, SELFMAG);
770 elf->e_ident[EI_CLASS] = ELF_CLASS;
771 elf->e_ident[EI_DATA] = ELF_DATA;
772 elf->e_ident[EI_VERSION] = EV_CURRENT;
773 elf->e_ident[EI_OSABI] = ELF_OSABI;
774 memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
775 elf->e_type = ET_CORE;
776 elf->e_machine = ELF_ARCH;
777 elf->e_version = EV_CURRENT;
778 elf->e_entry = 0;
779 elf->e_phoff = sizeof(struct elfhdr);
780 elf->e_shoff = 0;
781 elf->e_flags = ELF_CORE_EFLAGS;
782 elf->e_ehsize = sizeof(struct elfhdr);
783 elf->e_phentsize = sizeof(struct elf_phdr);
784 elf->e_phnum = 0;
785 elf->e_shentsize = 0;
786 elf->e_shnum = 0;
787 elf->e_shstrndx = 0;
788
789 return 0;
790}
791
792/*
793 * Traverse through memblock structure and setup crash memory ranges. These
794 * ranges will be used create PT_LOAD program headers in elfcore header.
795 */
796static void fadump_setup_crash_memory_ranges(void)
797{
798 struct memblock_region *reg;
799 unsigned long long start, end;
800
801 pr_debug("Setup crash memory ranges.\n");
802 crash_mem_ranges = 0;
803 /*
804 * add the first memory chunk (RMA_START through boot_memory_size) as
805 * a separate memory chunk. The reason is, at the time crash firmware
806 * will move the content of this memory chunk to different location
807 * specified during fadump registration. We need to create a separate
808 * program header for this chunk with the correct offset.
809 */
810 fadump_add_crash_memory(RMA_START, fw_dump.boot_memory_size);
811
812 for_each_memblock(memory, reg) {
813 start = (unsigned long long)reg->base;
814 end = start + (unsigned long long)reg->size;
815 if (start == RMA_START && end >= fw_dump.boot_memory_size)
816 start = fw_dump.boot_memory_size;
817
818 /* add this range excluding the reserved dump area. */
819 fadump_exclude_reserved_area(start, end);
820 }
821}
822
d34c5f26
MS		 823/*
824 * If the given physical address falls within the boot memory region then
825 * return the relocated address that points to the dump region reserved
826 * for saving initial boot memory contents.
827 */
828static inline unsigned long fadump_relocate(unsigned long paddr)
829{
830 if (paddr > RMA_START && paddr < fw_dump.boot_memory_size)
408cddd9 831 return be64_to_cpu(fdm.rmr_region.destination_address) + paddr;
d34c5f26
MS		 832 else
833 return paddr;
834}
835
2df173d9
MS		 836static int fadump_create_elfcore_headers(char *bufp)
837{
838 struct elfhdr *elf;
839 struct elf_phdr *phdr;
840 int i;
841
842 fadump_init_elfcore_header(bufp);
843 elf = (struct elfhdr *)bufp;
844 bufp += sizeof(struct elfhdr);
845
ebaeb5ae
MS		 846 /*
847 * setup ELF PT_NOTE, place holder for cpu notes info. The notes info
848 * will be populated during second kernel boot after crash. Hence
849 * this PT_NOTE will always be the first elf note.
850 *
851 * NOTE: Any new ELF note addition should be placed after this note.
852 */
853 phdr = (struct elf_phdr *)bufp;
854 bufp += sizeof(struct elf_phdr);
855 phdr->p_type = PT_NOTE;
856 phdr->p_flags = 0;
857 phdr->p_vaddr = 0;
858 phdr->p_align = 0;
859
860 phdr->p_offset = 0;
861 phdr->p_paddr = 0;
862 phdr->p_filesz = 0;
863 phdr->p_memsz = 0;
864
865 (elf->e_phnum)++;
866
d34c5f26
MS		 867 /* setup ELF PT_NOTE for vmcoreinfo */
868 phdr = (struct elf_phdr *)bufp;
869 bufp += sizeof(struct elf_phdr);
870 phdr->p_type = PT_NOTE;
871 phdr->p_flags = 0;
872 phdr->p_vaddr = 0;
873 phdr->p_align = 0;
874
875 phdr->p_paddr = fadump_relocate(paddr_vmcoreinfo_note());
876 phdr->p_offset = phdr->p_paddr;
877 phdr->p_memsz = vmcoreinfo_max_size;
878 phdr->p_filesz = vmcoreinfo_max_size;
879
880 /* Increment number of program headers. */
881 (elf->e_phnum)++;
882
2df173d9
MS		 883 /* setup PT_LOAD sections. */
884
885 for (i = 0; i < crash_mem_ranges; i++) {
886 unsigned long long mbase, msize;
887 mbase = crash_memory_ranges[i].base;
888 msize = crash_memory_ranges[i].size;
889
890 if (!msize)
891 continue;
892
893 phdr = (struct elf_phdr *)bufp;
894 bufp += sizeof(struct elf_phdr);
895 phdr->p_type = PT_LOAD;
896 phdr->p_flags = PF_R|PF_W|PF_X;
897 phdr->p_offset = mbase;
898
899 if (mbase == RMA_START) {
900 /*
901 * The entire RMA region will be moved by firmware
902 * to the specified destination_address. Hence set
903 * the correct offset.
904 */
408cddd9 905 phdr->p_offset = be64_to_cpu(fdm.rmr_region.destination_address);
2df173d9
MS		 906 }
907
908 phdr->p_paddr = mbase;
909 phdr->p_vaddr = (unsigned long)__va(mbase);
910 phdr->p_filesz = msize;
911 phdr->p_memsz = msize;
912 phdr->p_align = 0;
913
914 /* Increment number of program headers. */
915 (elf->e_phnum)++;
916 }
917 return 0;
918}
919
920static unsigned long init_fadump_header(unsigned long addr)
921{
922 struct fadump_crash_info_header *fdh;
923
924 if (!addr)
925 return 0;
926
927 fw_dump.fadumphdr_addr = addr;
928 fdh = __va(addr);
929 addr += sizeof(struct fadump_crash_info_header);
930
931 memset(fdh, 0, sizeof(struct fadump_crash_info_header));
932 fdh->magic_number = FADUMP_CRASH_INFO_MAGIC;
933 fdh->elfcorehdr_addr = addr;
ebaeb5ae
MS		 934 /* We will set the crashing cpu id in crash_fadump() during crash. */
935 fdh->crashing_cpu = CPU_UNKNOWN;
2df173d9
MS		 936
937 return addr;
938}
939
3ccc00a7
MS		 940static void register_fadump(void)
941{
2df173d9
MS		 942 unsigned long addr;
943 void *vaddr;
944
3ccc00a7
MS		 945 /*
946 * If no memory is reserved then we can not register for firmware-
947 * assisted dump.
948 */
949 if (!fw_dump.reserve_dump_area_size)
950 return;
951
2df173d9
MS		 952 fadump_setup_crash_memory_ranges();
953
408cddd9 954 addr = be64_to_cpu(fdm.rmr_region.destination_address) + be64_to_cpu(fdm.rmr_region.source_len);
2df173d9
MS		 955 /* Initialize fadump crash info header. */
956 addr = init_fadump_header(addr);
957 vaddr = __va(addr);
958
959 pr_debug("Creating ELF core headers at %#016lx\n", addr);
960 fadump_create_elfcore_headers(vaddr);
961
3ccc00a7
MS		 962 /* register the future kernel dump with firmware. */
963 register_fw_dump(&fdm);
964}
965
966static int fadump_unregister_dump(struct fadump_mem_struct *fdm)
967{
968 int rc = 0;
969 unsigned int wait_time;
970
971 pr_debug("Un-register firmware-assisted dump\n");
972
973 /* TODO: Add upper time limit for the delay */
974 do {
975 rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
976 FADUMP_UNREGISTER, fdm,
977 sizeof(struct fadump_mem_struct));
978
979 wait_time = rtas_busy_delay_time(rc);
980 if (wait_time)
981 mdelay(wait_time);
982 } while (wait_time);
983
984 if (rc) {
985 printk(KERN_ERR "Failed to un-register firmware-assisted dump."
986 " unexpected error(%d).\n", rc);
987 return rc;
988 }
989 fw_dump.dump_registered = 0;
990 return 0;
991}
992
b500afff
MS		 993static int fadump_invalidate_dump(struct fadump_mem_struct *fdm)
994{
995 int rc = 0;
996 unsigned int wait_time;
997
998 pr_debug("Invalidating firmware-assisted dump registration\n");
999
1000 /* TODO: Add upper time limit for the delay */
1001 do {
1002 rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
1003 FADUMP_INVALIDATE, fdm,
1004 sizeof(struct fadump_mem_struct));
1005
1006 wait_time = rtas_busy_delay_time(rc);
1007 if (wait_time)
1008 mdelay(wait_time);
1009 } while (wait_time);
1010
1011 if (rc) {
1012 printk(KERN_ERR "Failed to invalidate firmware-assisted dump "
1013 "rgistration. unexpected error(%d).\n", rc);
1014 return rc;
1015 }
1016 fw_dump.dump_active = 0;
1017 fdm_active = NULL;
1018 return 0;
1019}
1020
1021void fadump_cleanup(void)
1022{
1023 /* Invalidate the registration only if dump is active. */
1024 if (fw_dump.dump_active) {
1025 init_fadump_mem_struct(&fdm,
408cddd9 1026 be64_to_cpu(fdm_active->cpu_state_data.destination_address));
b500afff
MS		 1027 fadump_invalidate_dump(&fdm);
1028 }
1029}
1030
1031/*
1032 * Release the memory that was reserved in early boot to preserve the memory
1033 * contents. The released memory will be available for general use.
1034 */
1035static void fadump_release_memory(unsigned long begin, unsigned long end)
1036{
1037 unsigned long addr;
1038 unsigned long ra_start, ra_end;
1039
1040 ra_start = fw_dump.reserve_dump_area_start;
1041 ra_end = ra_start + fw_dump.reserve_dump_area_size;
1042
1043 for (addr = begin; addr < end; addr += PAGE_SIZE) {
1044 /*
1045 * exclude the dump reserve area. Will reuse it for next
1046 * fadump registration.
1047 */
1048 if (addr <= ra_end && ((addr + PAGE_SIZE) > ra_start))
1049 continue;
1050
5d585e5c 1051 free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT));
b500afff
MS		 1052 }
1053}
1054
1055static void fadump_invalidate_release_mem(void)
1056{
1057 unsigned long reserved_area_start, reserved_area_end;
1058 unsigned long destination_address;
1059
1060 mutex_lock(&fadump_mutex);
1061 if (!fw_dump.dump_active) {
1062 mutex_unlock(&fadump_mutex);
1063 return;
1064 }
1065
408cddd9 1066 destination_address = be64_to_cpu(fdm_active->cpu_state_data.destination_address);
b500afff
MS		 1067 fadump_cleanup();
1068 mutex_unlock(&fadump_mutex);
1069
1070 /*
1071 * Save the current reserved memory bounds we will require them
1072 * later for releasing the memory for general use.
1073 */
1074 reserved_area_start = fw_dump.reserve_dump_area_start;
1075 reserved_area_end = reserved_area_start +
1076 fw_dump.reserve_dump_area_size;
1077 /*
1078 * Setup reserve_dump_area_start and its size so that we can
1079 * reuse this reserved memory for Re-registration.
1080 */
1081 fw_dump.reserve_dump_area_start = destination_address;
1082 fw_dump.reserve_dump_area_size = get_fadump_area_size();
1083
1084 fadump_release_memory(reserved_area_start, reserved_area_end);
1085 if (fw_dump.cpu_notes_buf) {
1086 fadump_cpu_notes_buf_free(
1087 (unsigned long)__va(fw_dump.cpu_notes_buf),
1088 fw_dump.cpu_notes_buf_size);
1089 fw_dump.cpu_notes_buf = 0;
1090 fw_dump.cpu_notes_buf_size = 0;
1091 }
1092 /* Initialize the kernel dump memory structure for FAD registration. */
1093 init_fadump_mem_struct(&fdm, fw_dump.reserve_dump_area_start);
1094}
1095
1096static ssize_t fadump_release_memory_store(struct kobject *kobj,
1097 struct kobj_attribute *attr,
1098 const char *buf, size_t count)
1099{
1100 if (!fw_dump.dump_active)
1101 return -EPERM;
1102
1103 if (buf[0] == '1') {
1104 /*
1105 * Take away the '/proc/vmcore'. We are releasing the dump
1106 * memory, hence it will not be valid anymore.
1107 */
1108 vmcore_cleanup();
1109 fadump_invalidate_release_mem();
1110
1111 } else
1112 return -EINVAL;
1113 return count;
1114}
1115
3ccc00a7
MS		 1116static ssize_t fadump_enabled_show(struct kobject *kobj,
1117 struct kobj_attribute *attr,
1118 char *buf)
1119{
1120 return sprintf(buf, "%d\n", fw_dump.fadump_enabled);
1121}
1122
1123static ssize_t fadump_register_show(struct kobject *kobj,
1124 struct kobj_attribute *attr,
1125 char *buf)
1126{
1127 return sprintf(buf, "%d\n", fw_dump.dump_registered);
1128}
1129
1130static ssize_t fadump_register_store(struct kobject *kobj,
1131 struct kobj_attribute *attr,
1132 const char *buf, size_t count)
1133{
1134 int ret = 0;
1135
1136 if (!fw_dump.fadump_enabled || fdm_active)
1137 return -EPERM;
1138
1139 mutex_lock(&fadump_mutex);
1140
1141 switch (buf[0]) {
1142 case '0':
1143 if (fw_dump.dump_registered == 0) {
1144 ret = -EINVAL;
1145 goto unlock_out;
1146 }
1147 /* Un-register Firmware-assisted dump */
1148 fadump_unregister_dump(&fdm);
1149 break;
1150 case '1':
1151 if (fw_dump.dump_registered == 1) {
1152 ret = -EINVAL;
1153 goto unlock_out;
1154 }
1155 /* Register Firmware-assisted dump */
1156 register_fadump();
1157 break;
1158 default:
1159 ret = -EINVAL;
1160 break;
1161 }
1162
1163unlock_out:
1164 mutex_unlock(&fadump_mutex);
1165 return ret < 0 ? ret : count;
1166}
1167
1168static int fadump_region_show(struct seq_file *m, void *private)
1169{
1170 const struct fadump_mem_struct *fdm_ptr;
1171
1172 if (!fw_dump.fadump_enabled)
1173 return 0;
1174
b500afff 1175 mutex_lock(&fadump_mutex);
3ccc00a7
MS		 1176 if (fdm_active)
1177 fdm_ptr = fdm_active;
b500afff
MS		 1178 else {
1179 mutex_unlock(&fadump_mutex);
3ccc00a7 1180 fdm_ptr = &fdm;
b500afff 1181 }
3ccc00a7
MS		 1182
1183 seq_printf(m,
1184 "CPU : [%#016llx-%#016llx] %#llx bytes, "
1185 "Dumped: %#llx\n",
408cddd9
HB		 1186 be64_to_cpu(fdm_ptr->cpu_state_data.destination_address),
1187 be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) +
1188 be64_to_cpu(fdm_ptr->cpu_state_data.source_len) - 1,
1189 be64_to_cpu(fdm_ptr->cpu_state_data.source_len),
1190 be64_to_cpu(fdm_ptr->cpu_state_data.bytes_dumped));
3ccc00a7
MS		 1191 seq_printf(m,
1192 "HPTE: [%#016llx-%#016llx] %#llx bytes, "
1193 "Dumped: %#llx\n",
408cddd9
HB		 1194 be64_to_cpu(fdm_ptr->hpte_region.destination_address),
1195 be64_to_cpu(fdm_ptr->hpte_region.destination_address) +
1196 be64_to_cpu(fdm_ptr->hpte_region.source_len) - 1,
1197 be64_to_cpu(fdm_ptr->hpte_region.source_len),
1198 be64_to_cpu(fdm_ptr->hpte_region.bytes_dumped));
3ccc00a7
MS		 1199 seq_printf(m,
1200 "DUMP: [%#016llx-%#016llx] %#llx bytes, "
1201 "Dumped: %#llx\n",
408cddd9
HB		 1202 be64_to_cpu(fdm_ptr->rmr_region.destination_address),
1203 be64_to_cpu(fdm_ptr->rmr_region.destination_address) +
1204 be64_to_cpu(fdm_ptr->rmr_region.source_len) - 1,
1205 be64_to_cpu(fdm_ptr->rmr_region.source_len),
1206 be64_to_cpu(fdm_ptr->rmr_region.bytes_dumped));
3ccc00a7
MS		 1207
1208 if (!fdm_active ||
1209 (fw_dump.reserve_dump_area_start ==
408cddd9 1210 be64_to_cpu(fdm_ptr->cpu_state_data.destination_address)))
b500afff 1211 goto out;
3ccc00a7
MS		 1212
1213 /* Dump is active. Show reserved memory region. */
1214 seq_printf(m,
1215 " : [%#016llx-%#016llx] %#llx bytes, "
1216 "Dumped: %#llx\n",
1217 (unsigned long long)fw_dump.reserve_dump_area_start,
408cddd9
HB		 1218 be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) - 1,
1219 be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) -
3ccc00a7 1220 fw_dump.reserve_dump_area_start,
408cddd9 1221 be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) -
3ccc00a7 1222 fw_dump.reserve_dump_area_start);
b500afff
MS		 1223out:
1224 if (fdm_active)
1225 mutex_unlock(&fadump_mutex);
3ccc00a7
MS		 1226 return 0;
1227}
1228
b500afff
MS		 1229static struct kobj_attribute fadump_release_attr = __ATTR(fadump_release_mem,
1230 0200, NULL,
1231 fadump_release_memory_store);
3ccc00a7
MS		 1232static struct kobj_attribute fadump_attr = __ATTR(fadump_enabled,
1233 0444, fadump_enabled_show,
1234 NULL);
1235static struct kobj_attribute fadump_register_attr = __ATTR(fadump_registered,
1236 0644, fadump_register_show,
1237 fadump_register_store);
1238
1239static int fadump_region_open(struct inode *inode, struct file *file)
1240{
1241 return single_open(file, fadump_region_show, inode->i_private);
1242}
1243
1244static const struct file_operations fadump_region_fops = {
1245 .open = fadump_region_open,
1246 .read = seq_read,
1247 .llseek = seq_lseek,
1248 .release = single_release,
1249};
1250
1251static void fadump_init_files(void)
1252{
1253 struct dentry *debugfs_file;
1254 int rc = 0;
1255
1256 rc = sysfs_create_file(kernel_kobj, &fadump_attr.attr);
1257 if (rc)
1258 printk(KERN_ERR "fadump: unable to create sysfs file"
1259 " fadump_enabled (%d)\n", rc);
1260
1261 rc = sysfs_create_file(kernel_kobj, &fadump_register_attr.attr);
1262 if (rc)
1263 printk(KERN_ERR "fadump: unable to create sysfs file"
1264 " fadump_registered (%d)\n", rc);
1265
1266 debugfs_file = debugfs_create_file("fadump_region", 0444,
1267 powerpc_debugfs_root, NULL,
1268 &fadump_region_fops);
1269 if (!debugfs_file)
1270 printk(KERN_ERR "fadump: unable to create debugfs file"
1271 " fadump_region\n");
b500afff
MS		 1272
1273 if (fw_dump.dump_active) {
1274 rc = sysfs_create_file(kernel_kobj, &fadump_release_attr.attr);
1275 if (rc)
1276 printk(KERN_ERR "fadump: unable to create sysfs file"
1277 " fadump_release_mem (%d)\n", rc);
1278 }
3ccc00a7
MS		 1279 return;
1280}
1281
1282/*
1283 * Prepare for firmware-assisted dump.
1284 */
1285int __init setup_fadump(void)
1286{
1287 if (!fw_dump.fadump_enabled)
1288 return 0;
1289
1290 if (!fw_dump.fadump_supported) {
1291 printk(KERN_ERR "Firmware-assisted dump is not supported on"
1292 " this hardware\n");
1293 return 0;
1294 }
1295
1296 fadump_show_config();
2df173d9
MS		 1297 /*
1298 * If dump data is available then see if it is valid and prepare for
1299 * saving it to the disk.
1300 */
b500afff
MS		 1301 if (fw_dump.dump_active) {
1302 /*
1303 * if dump process fails then invalidate the registration
1304 * and release memory before proceeding for re-registration.
1305 */
1306 if (process_fadump(fdm_active) < 0)
1307 fadump_invalidate_release_mem();
1308 }
3ccc00a7 1309 /* Initialize the kernel dump memory structure for FAD registration. */
2df173d9 1310 else if (fw_dump.reserve_dump_area_size)
3ccc00a7
MS		 1311 init_fadump_mem_struct(&fdm, fw_dump.reserve_dump_area_start);
1312 fadump_init_files();
1313
1314 return 1;
1315}
1316subsys_initcall(setup_fadump);
Linux kernel - Deliverables
This page took 0.263698 seconds and 5 git commands to generate.