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