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 | 32 | #include <linux/delay.h> |
3ccc00a7 | 33 | #include <linux/seq_file.h> |
2df173d9 | 34 | #include <linux/crash_dump.h> |
b500afff MS |
35 | #include <linux/kobject.h> |
36 | #include <linux/sysfs.h> | |
a5818313 | 37 | #include <linux/slab.h> |
a4e92ce8 | 38 | #include <linux/cma.h> |
eb39c880 | 39 | |
7644d581 | 40 | #include <asm/debugfs.h> |
eb39c880 MS |
41 | #include <asm/page.h> |
42 | #include <asm/prom.h> | |
43 | #include <asm/rtas.h> | |
44 | #include <asm/fadump.h> | |
cad3c834 | 45 | #include <asm/setup.h> |
eb39c880 MS |
46 | |
47 | static struct fw_dump fw_dump; | |
3ccc00a7 MS |
48 | static struct fadump_mem_struct fdm; |
49 | static const struct fadump_mem_struct *fdm_active; | |
a4e92ce8 MS |
50 | #ifdef CONFIG_CMA |
51 | static struct cma *fadump_cma; | |
52 | #endif | |
3ccc00a7 MS |
53 | |
54 | static DEFINE_MUTEX(fadump_mutex); | |
1bd6a1c4 HB |
55 | struct fad_crash_memory_ranges *crash_memory_ranges; |
56 | int crash_memory_ranges_size; | |
2df173d9 | 57 | int crash_mem_ranges; |
1bd6a1c4 | 58 | int max_crash_mem_ranges; |
eb39c880 | 59 | |
a4e92ce8 MS |
60 | #ifdef CONFIG_CMA |
61 | /* | |
62 | * fadump_cma_init() - Initialize CMA area from a fadump reserved memory | |
63 | * | |
64 | * This function initializes CMA area from fadump reserved memory. | |
65 | * The total size of fadump reserved memory covers for boot memory size | |
66 | * + cpu data size + hpte size and metadata. | |
67 | * Initialize only the area equivalent to boot memory size for CMA use. | |
68 | * The reamining portion of fadump reserved memory will be not given | |
69 | * to CMA and pages for thoes will stay reserved. boot memory size is | |
70 | * aligned per CMA requirement to satisy cma_init_reserved_mem() call. | |
71 | * But for some reason even if it fails we still have the memory reservation | |
72 | * with us and we can still continue doing fadump. | |
73 | */ | |
74 | int __init fadump_cma_init(void) | |
75 | { | |
76 | unsigned long long base, size; | |
77 | int rc; | |
78 | ||
79 | if (!fw_dump.fadump_enabled) | |
80 | return 0; | |
81 | ||
82 | /* | |
83 | * Do not use CMA if user has provided fadump=nocma kernel parameter. | |
84 | * Return 1 to continue with fadump old behaviour. | |
85 | */ | |
86 | if (fw_dump.nocma) | |
87 | return 1; | |
88 | ||
89 | base = fw_dump.reserve_dump_area_start; | |
90 | size = fw_dump.boot_memory_size; | |
91 | ||
92 | if (!size) | |
93 | return 0; | |
94 | ||
95 | rc = cma_init_reserved_mem(base, size, 0, "fadump_cma", &fadump_cma); | |
96 | if (rc) { | |
97 | pr_err("Failed to init cma area for firmware-assisted dump,%d\n", rc); | |
98 | /* | |
99 | * Though the CMA init has failed we still have memory | |
100 | * reservation with us. The reserved memory will be | |
101 | * blocked from production system usage. Hence return 1, | |
102 | * so that we can continue with fadump. | |
103 | */ | |
104 | return 1; | |
105 | } | |
106 | ||
107 | /* | |
108 | * So we now have successfully initialized cma area for fadump. | |
109 | */ | |
110 | pr_info("Initialized 0x%lx bytes cma area at %ldMB from 0x%lx " | |
111 | "bytes of memory reserved for firmware-assisted dump\n", | |
112 | cma_get_size(fadump_cma), | |
113 | (unsigned long)cma_get_base(fadump_cma) >> 20, | |
114 | fw_dump.reserve_dump_area_size); | |
115 | return 1; | |
116 | } | |
117 | #else | |
118 | static int __init fadump_cma_init(void) { return 1; } | |
119 | #endif /* CONFIG_CMA */ | |
120 | ||
eb39c880 MS |
121 | /* Scan the Firmware Assisted dump configuration details. */ |
122 | int __init early_init_dt_scan_fw_dump(unsigned long node, | |
123 | const char *uname, int depth, void *data) | |
124 | { | |
9d0c4dfe | 125 | const __be32 *sections; |
eb39c880 | 126 | int i, num_sections; |
9d0c4dfe | 127 | int size; |
408cddd9 | 128 | const __be32 *token; |
eb39c880 MS |
129 | |
130 | if (depth != 1 || strcmp(uname, "rtas") != 0) | |
131 | return 0; | |
132 | ||
133 | /* | |
134 | * Check if Firmware Assisted dump is supported. if yes, check | |
135 | * if dump has been initiated on last reboot. | |
136 | */ | |
137 | token = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL); | |
138 | if (!token) | |
a7d04317 | 139 | return 1; |
eb39c880 MS |
140 | |
141 | fw_dump.fadump_supported = 1; | |
408cddd9 | 142 | fw_dump.ibm_configure_kernel_dump = be32_to_cpu(*token); |
eb39c880 MS |
143 | |
144 | /* | |
145 | * The 'ibm,kernel-dump' rtas node is present only if there is | |
146 | * dump data waiting for us. | |
147 | */ | |
3ccc00a7 MS |
148 | fdm_active = of_get_flat_dt_prop(node, "ibm,kernel-dump", NULL); |
149 | if (fdm_active) | |
eb39c880 MS |
150 | fw_dump.dump_active = 1; |
151 | ||
152 | /* Get the sizes required to store dump data for the firmware provided | |
153 | * dump sections. | |
154 | * For each dump section type supported, a 32bit cell which defines | |
155 | * the ID of a supported section followed by two 32 bit cells which | |
156 | * gives teh size of the section in bytes. | |
157 | */ | |
158 | sections = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes", | |
159 | &size); | |
160 | ||
161 | if (!sections) | |
a7d04317 | 162 | return 1; |
eb39c880 MS |
163 | |
164 | num_sections = size / (3 * sizeof(u32)); | |
165 | ||
166 | for (i = 0; i < num_sections; i++, sections += 3) { | |
167 | u32 type = (u32)of_read_number(sections, 1); | |
168 | ||
169 | switch (type) { | |
170 | case FADUMP_CPU_STATE_DATA: | |
171 | fw_dump.cpu_state_data_size = | |
172 | of_read_ulong(§ions[1], 2); | |
173 | break; | |
174 | case FADUMP_HPTE_REGION: | |
175 | fw_dump.hpte_region_size = | |
176 | of_read_ulong(§ions[1], 2); | |
177 | break; | |
178 | } | |
179 | } | |
a7d04317 | 180 | |
eb39c880 MS |
181 | return 1; |
182 | } | |
183 | ||
eae0dfcc HB |
184 | /* |
185 | * If fadump is registered, check if the memory provided | |
0db6896f | 186 | * falls within boot memory area and reserved memory area. |
eae0dfcc | 187 | */ |
0db6896f | 188 | int is_fadump_memory_area(u64 addr, ulong size) |
eae0dfcc | 189 | { |
0db6896f MS |
190 | u64 d_start = fw_dump.reserve_dump_area_start; |
191 | u64 d_end = d_start + fw_dump.reserve_dump_area_size; | |
192 | ||
eae0dfcc HB |
193 | if (!fw_dump.dump_registered) |
194 | return 0; | |
195 | ||
0db6896f MS |
196 | if (((addr + size) > d_start) && (addr <= d_end)) |
197 | return 1; | |
198 | ||
eae0dfcc HB |
199 | return (addr + size) > RMA_START && addr <= fw_dump.boot_memory_size; |
200 | } | |
201 | ||
6fcd6baa NP |
202 | int should_fadump_crash(void) |
203 | { | |
204 | if (!fw_dump.dump_registered || !fw_dump.fadumphdr_addr) | |
205 | return 0; | |
206 | return 1; | |
207 | } | |
208 | ||
3ccc00a7 MS |
209 | int is_fadump_active(void) |
210 | { | |
211 | return fw_dump.dump_active; | |
212 | } | |
213 | ||
a5a05b91 HB |
214 | /* |
215 | * Returns 1, if there are no holes in boot memory area, | |
216 | * 0 otherwise. | |
217 | */ | |
218 | static int is_boot_memory_area_contiguous(void) | |
219 | { | |
220 | struct memblock_region *reg; | |
221 | unsigned long tstart, tend; | |
222 | unsigned long start_pfn = PHYS_PFN(RMA_START); | |
223 | unsigned long end_pfn = PHYS_PFN(RMA_START + fw_dump.boot_memory_size); | |
224 | unsigned int ret = 0; | |
225 | ||
226 | for_each_memblock(memory, reg) { | |
227 | tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); | |
228 | tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); | |
229 | if (tstart < tend) { | |
230 | /* Memory hole from start_pfn to tstart */ | |
231 | if (tstart > start_pfn) | |
232 | break; | |
233 | ||
234 | if (tend == end_pfn) { | |
235 | ret = 1; | |
236 | break; | |
237 | } | |
238 | ||
239 | start_pfn = tend + 1; | |
240 | } | |
241 | } | |
242 | ||
243 | return ret; | |
244 | } | |
245 | ||
f86593be MS |
246 | /* |
247 | * Returns true, if there are no holes in reserved memory area, | |
248 | * false otherwise. | |
249 | */ | |
250 | static bool is_reserved_memory_area_contiguous(void) | |
251 | { | |
252 | struct memblock_region *reg; | |
253 | unsigned long start, end; | |
254 | unsigned long d_start = fw_dump.reserve_dump_area_start; | |
255 | unsigned long d_end = d_start + fw_dump.reserve_dump_area_size; | |
256 | ||
257 | for_each_memblock(memory, reg) { | |
258 | start = max(d_start, (unsigned long)reg->base); | |
259 | end = min(d_end, (unsigned long)(reg->base + reg->size)); | |
260 | if (d_start < end) { | |
261 | /* Memory hole from d_start to start */ | |
262 | if (start > d_start) | |
263 | break; | |
264 | ||
265 | if (end == d_end) | |
266 | return true; | |
267 | ||
268 | d_start = end + 1; | |
269 | } | |
270 | } | |
271 | ||
272 | return false; | |
273 | } | |
274 | ||
3ccc00a7 MS |
275 | /* Print firmware assisted dump configurations for debugging purpose. */ |
276 | static void fadump_show_config(void) | |
277 | { | |
278 | pr_debug("Support for firmware-assisted dump (fadump): %s\n", | |
279 | (fw_dump.fadump_supported ? "present" : "no support")); | |
280 | ||
281 | if (!fw_dump.fadump_supported) | |
282 | return; | |
283 | ||
284 | pr_debug("Fadump enabled : %s\n", | |
285 | (fw_dump.fadump_enabled ? "yes" : "no")); | |
286 | pr_debug("Dump Active : %s\n", | |
287 | (fw_dump.dump_active ? "yes" : "no")); | |
288 | pr_debug("Dump section sizes:\n"); | |
289 | pr_debug(" CPU state data size: %lx\n", fw_dump.cpu_state_data_size); | |
290 | pr_debug(" HPTE region size : %lx\n", fw_dump.hpte_region_size); | |
291 | pr_debug("Boot memory size : %lx\n", fw_dump.boot_memory_size); | |
292 | } | |
293 | ||
294 | static unsigned long init_fadump_mem_struct(struct fadump_mem_struct *fdm, | |
295 | unsigned long addr) | |
296 | { | |
297 | if (!fdm) | |
298 | return 0; | |
299 | ||
300 | memset(fdm, 0, sizeof(struct fadump_mem_struct)); | |
301 | addr = addr & PAGE_MASK; | |
302 | ||
408cddd9 HB |
303 | fdm->header.dump_format_version = cpu_to_be32(0x00000001); |
304 | fdm->header.dump_num_sections = cpu_to_be16(3); | |
3ccc00a7 MS |
305 | fdm->header.dump_status_flag = 0; |
306 | fdm->header.offset_first_dump_section = | |
408cddd9 | 307 | cpu_to_be32((u32)offsetof(struct fadump_mem_struct, cpu_state_data)); |
3ccc00a7 MS |
308 | |
309 | /* | |
310 | * Fields for disk dump option. | |
311 | * We are not using disk dump option, hence set these fields to 0. | |
312 | */ | |
313 | fdm->header.dd_block_size = 0; | |
314 | fdm->header.dd_block_offset = 0; | |
315 | fdm->header.dd_num_blocks = 0; | |
316 | fdm->header.dd_offset_disk_path = 0; | |
317 | ||
318 | /* set 0 to disable an automatic dump-reboot. */ | |
319 | fdm->header.max_time_auto = 0; | |
320 | ||
321 | /* Kernel dump sections */ | |
322 | /* cpu state data section. */ | |
408cddd9 HB |
323 | fdm->cpu_state_data.request_flag = cpu_to_be32(FADUMP_REQUEST_FLAG); |
324 | fdm->cpu_state_data.source_data_type = cpu_to_be16(FADUMP_CPU_STATE_DATA); | |
3ccc00a7 | 325 | fdm->cpu_state_data.source_address = 0; |
408cddd9 HB |
326 | fdm->cpu_state_data.source_len = cpu_to_be64(fw_dump.cpu_state_data_size); |
327 | fdm->cpu_state_data.destination_address = cpu_to_be64(addr); | |
3ccc00a7 MS |
328 | addr += fw_dump.cpu_state_data_size; |
329 | ||
330 | /* hpte region section */ | |
408cddd9 HB |
331 | fdm->hpte_region.request_flag = cpu_to_be32(FADUMP_REQUEST_FLAG); |
332 | fdm->hpte_region.source_data_type = cpu_to_be16(FADUMP_HPTE_REGION); | |
3ccc00a7 | 333 | fdm->hpte_region.source_address = 0; |
408cddd9 HB |
334 | fdm->hpte_region.source_len = cpu_to_be64(fw_dump.hpte_region_size); |
335 | fdm->hpte_region.destination_address = cpu_to_be64(addr); | |
3ccc00a7 MS |
336 | addr += fw_dump.hpte_region_size; |
337 | ||
338 | /* RMA region section */ | |
408cddd9 HB |
339 | fdm->rmr_region.request_flag = cpu_to_be32(FADUMP_REQUEST_FLAG); |
340 | fdm->rmr_region.source_data_type = cpu_to_be16(FADUMP_REAL_MODE_REGION); | |
341 | fdm->rmr_region.source_address = cpu_to_be64(RMA_START); | |
342 | fdm->rmr_region.source_len = cpu_to_be64(fw_dump.boot_memory_size); | |
343 | fdm->rmr_region.destination_address = cpu_to_be64(addr); | |
3ccc00a7 MS |
344 | addr += fw_dump.boot_memory_size; |
345 | ||
346 | return addr; | |
347 | } | |
348 | ||
eb39c880 MS |
349 | /** |
350 | * fadump_calculate_reserve_size(): reserve variable boot area 5% of System RAM | |
351 | * | |
352 | * Function to find the largest memory size we need to reserve during early | |
353 | * boot process. This will be the size of the memory that is required for a | |
354 | * kernel to boot successfully. | |
355 | * | |
356 | * This function has been taken from phyp-assisted dump feature implementation. | |
357 | * | |
358 | * returns larger of 256MB or 5% rounded down to multiples of 256MB. | |
359 | * | |
360 | * TODO: Come up with better approach to find out more accurate memory size | |
361 | * that is required for a kernel to boot successfully. | |
362 | * | |
363 | */ | |
364 | static inline unsigned long fadump_calculate_reserve_size(void) | |
365 | { | |
11550dc0 HB |
366 | int ret; |
367 | unsigned long long base, size; | |
eb39c880 | 368 | |
81d9eca5 HB |
369 | if (fw_dump.reserve_bootvar) |
370 | pr_warn("'fadump_reserve_mem=' parameter is deprecated in favor of 'crashkernel=' parameter.\n"); | |
371 | ||
eb39c880 | 372 | /* |
11550dc0 | 373 | * Check if the size is specified through crashkernel= cmdline |
e7467dc6 HB |
374 | * option. If yes, then use that but ignore base as fadump reserves |
375 | * memory at a predefined offset. | |
eb39c880 | 376 | */ |
11550dc0 HB |
377 | ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), |
378 | &size, &base); | |
379 | if (ret == 0 && size > 0) { | |
48a316e3 HB |
380 | unsigned long max_size; |
381 | ||
81d9eca5 HB |
382 | if (fw_dump.reserve_bootvar) |
383 | pr_info("Using 'crashkernel=' parameter for memory reservation.\n"); | |
384 | ||
11550dc0 | 385 | fw_dump.reserve_bootvar = (unsigned long)size; |
48a316e3 HB |
386 | |
387 | /* | |
388 | * Adjust if the boot memory size specified is above | |
389 | * the upper limit. | |
390 | */ | |
391 | max_size = memblock_phys_mem_size() / MAX_BOOT_MEM_RATIO; | |
392 | if (fw_dump.reserve_bootvar > max_size) { | |
393 | fw_dump.reserve_bootvar = max_size; | |
394 | pr_info("Adjusted boot memory size to %luMB\n", | |
395 | (fw_dump.reserve_bootvar >> 20)); | |
396 | } | |
397 | ||
eb39c880 | 398 | return fw_dump.reserve_bootvar; |
81d9eca5 HB |
399 | } else if (fw_dump.reserve_bootvar) { |
400 | /* | |
401 | * 'fadump_reserve_mem=' is being used to reserve memory | |
402 | * for firmware-assisted dump. | |
403 | */ | |
404 | return fw_dump.reserve_bootvar; | |
11550dc0 | 405 | } |
eb39c880 MS |
406 | |
407 | /* divide by 20 to get 5% of value */ | |
48a316e3 | 408 | size = memblock_phys_mem_size() / 20; |
eb39c880 MS |
409 | |
410 | /* round it down in multiples of 256 */ | |
411 | size = size & ~0x0FFFFFFFUL; | |
412 | ||
413 | /* Truncate to memory_limit. We don't want to over reserve the memory.*/ | |
414 | if (memory_limit && size > memory_limit) | |
415 | size = memory_limit; | |
416 | ||
417 | return (size > MIN_BOOT_MEM ? size : MIN_BOOT_MEM); | |
418 | } | |
419 | ||
420 | /* | |
421 | * Calculate the total memory size required to be reserved for | |
422 | * firmware-assisted dump registration. | |
423 | */ | |
424 | static unsigned long get_fadump_area_size(void) | |
425 | { | |
426 | unsigned long size = 0; | |
427 | ||
428 | size += fw_dump.cpu_state_data_size; | |
429 | size += fw_dump.hpte_region_size; | |
430 | size += fw_dump.boot_memory_size; | |
2df173d9 MS |
431 | size += sizeof(struct fadump_crash_info_header); |
432 | size += sizeof(struct elfhdr); /* ELF core header.*/ | |
ebaeb5ae | 433 | size += sizeof(struct elf_phdr); /* place holder for cpu notes */ |
2df173d9 MS |
434 | /* Program headers for crash memory regions. */ |
435 | size += sizeof(struct elf_phdr) * (memblock_num_regions(memory) + 2); | |
eb39c880 MS |
436 | |
437 | size = PAGE_ALIGN(size); | |
438 | return size; | |
439 | } | |
440 | ||
b71a693d MS |
441 | static void __init fadump_reserve_crash_area(unsigned long base, |
442 | unsigned long size) | |
443 | { | |
444 | struct memblock_region *reg; | |
445 | unsigned long mstart, mend, msize; | |
446 | ||
447 | for_each_memblock(memory, reg) { | |
448 | mstart = max_t(unsigned long, base, reg->base); | |
449 | mend = reg->base + reg->size; | |
450 | mend = min(base + size, mend); | |
451 | ||
452 | if (mstart < mend) { | |
453 | msize = mend - mstart; | |
454 | memblock_reserve(mstart, msize); | |
455 | pr_info("Reserved %ldMB of memory at %#016lx for saving crash dump\n", | |
456 | (msize >> 20), mstart); | |
457 | } | |
458 | } | |
459 | } | |
460 | ||
eb39c880 MS |
461 | int __init fadump_reserve_mem(void) |
462 | { | |
463 | unsigned long base, size, memory_boundary; | |
464 | ||
465 | if (!fw_dump.fadump_enabled) | |
466 | return 0; | |
467 | ||
468 | if (!fw_dump.fadump_supported) { | |
469 | printk(KERN_INFO "Firmware-assisted dump is not supported on" | |
470 | " this hardware\n"); | |
471 | fw_dump.fadump_enabled = 0; | |
472 | return 0; | |
473 | } | |
3ccc00a7 MS |
474 | /* |
475 | * Initialize boot memory size | |
476 | * If dump is active then we have already calculated the size during | |
477 | * first kernel. | |
478 | */ | |
479 | if (fdm_active) | |
408cddd9 | 480 | fw_dump.boot_memory_size = be64_to_cpu(fdm_active->rmr_region.source_len); |
a4e92ce8 | 481 | else { |
3ccc00a7 | 482 | fw_dump.boot_memory_size = fadump_calculate_reserve_size(); |
a4e92ce8 MS |
483 | #ifdef CONFIG_CMA |
484 | if (!fw_dump.nocma) | |
485 | fw_dump.boot_memory_size = | |
486 | ALIGN(fw_dump.boot_memory_size, | |
487 | FADUMP_CMA_ALIGNMENT); | |
488 | #endif | |
489 | } | |
eb39c880 MS |
490 | |
491 | /* | |
492 | * Calculate the memory boundary. | |
493 | * If memory_limit is less than actual memory boundary then reserve | |
494 | * the memory for fadump beyond the memory_limit and adjust the | |
495 | * memory_limit accordingly, so that the running kernel can run with | |
496 | * specified memory_limit. | |
497 | */ | |
498 | if (memory_limit && memory_limit < memblock_end_of_DRAM()) { | |
499 | size = get_fadump_area_size(); | |
500 | if ((memory_limit + size) < memblock_end_of_DRAM()) | |
501 | memory_limit += size; | |
502 | else | |
503 | memory_limit = memblock_end_of_DRAM(); | |
504 | printk(KERN_INFO "Adjusted memory_limit for firmware-assisted" | |
a84fcd46 | 505 | " dump, now %#016llx\n", memory_limit); |
eb39c880 MS |
506 | } |
507 | if (memory_limit) | |
508 | memory_boundary = memory_limit; | |
509 | else | |
510 | memory_boundary = memblock_end_of_DRAM(); | |
511 | ||
512 | if (fw_dump.dump_active) { | |
b71a693d MS |
513 | pr_info("Firmware-assisted dump is active.\n"); |
514 | ||
85975387 HB |
515 | #ifdef CONFIG_HUGETLB_PAGE |
516 | /* | |
517 | * FADump capture kernel doesn't care much about hugepages. | |
518 | * In fact, handling hugepages in capture kernel is asking for | |
519 | * trouble. So, disable HugeTLB support when fadump is active. | |
520 | */ | |
521 | hugetlb_disabled = true; | |
522 | #endif | |
eb39c880 MS |
523 | /* |
524 | * If last boot has crashed then reserve all the memory | |
525 | * above boot_memory_size so that we don't touch it until | |
526 | * dump is written to disk by userspace tool. This memory | |
527 | * will be released for general use once the dump is saved. | |
528 | */ | |
529 | base = fw_dump.boot_memory_size; | |
530 | size = memory_boundary - base; | |
b71a693d | 531 | fadump_reserve_crash_area(base, size); |
2df173d9 MS |
532 | |
533 | fw_dump.fadumphdr_addr = | |
408cddd9 HB |
534 | be64_to_cpu(fdm_active->rmr_region.destination_address) + |
535 | be64_to_cpu(fdm_active->rmr_region.source_len); | |
a4e92ce8 MS |
536 | pr_debug("fadumphdr_addr = %pa\n", &fw_dump.fadumphdr_addr); |
537 | fw_dump.reserve_dump_area_start = base; | |
538 | fw_dump.reserve_dump_area_size = size; | |
eb39c880 | 539 | } else { |
eb39c880 | 540 | size = get_fadump_area_size(); |
f6e6bedb HB |
541 | |
542 | /* | |
543 | * Reserve memory at an offset closer to bottom of the RAM to | |
544 | * minimize the impact of memory hot-remove operation. We can't | |
545 | * use memblock_find_in_range() here since it doesn't allocate | |
546 | * from bottom to top. | |
547 | */ | |
548 | for (base = fw_dump.boot_memory_size; | |
549 | base <= (memory_boundary - size); | |
550 | base += size) { | |
551 | if (memblock_is_region_memory(base, size) && | |
552 | !memblock_is_region_reserved(base, size)) | |
553 | break; | |
554 | } | |
555 | if ((base > (memory_boundary - size)) || | |
556 | memblock_reserve(base, size)) { | |
557 | pr_err("Failed to reserve memory\n"); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | pr_info("Reserved %ldMB of memory at %ldMB for firmware-" | |
562 | "assisted dump (System RAM: %ldMB)\n", | |
563 | (unsigned long)(size >> 20), | |
564 | (unsigned long)(base >> 20), | |
565 | (unsigned long)(memblock_phys_mem_size() >> 20)); | |
f6e6bedb | 566 | |
a4e92ce8 MS |
567 | fw_dump.reserve_dump_area_start = base; |
568 | fw_dump.reserve_dump_area_size = size; | |
569 | return fadump_cma_init(); | |
570 | } | |
eb39c880 MS |
571 | return 1; |
572 | } | |
573 | ||
1e76609c SD |
574 | unsigned long __init arch_reserved_kernel_pages(void) |
575 | { | |
576 | return memblock_reserved_size() / PAGE_SIZE; | |
577 | } | |
578 | ||
eb39c880 MS |
579 | /* Look for fadump= cmdline option. */ |
580 | static int __init early_fadump_param(char *p) | |
581 | { | |
582 | if (!p) | |
583 | return 1; | |
584 | ||
585 | if (strncmp(p, "on", 2) == 0) | |
586 | fw_dump.fadump_enabled = 1; | |
587 | else if (strncmp(p, "off", 3) == 0) | |
588 | fw_dump.fadump_enabled = 0; | |
a4e92ce8 MS |
589 | else if (strncmp(p, "nocma", 5) == 0) { |
590 | fw_dump.fadump_enabled = 1; | |
591 | fw_dump.nocma = 1; | |
592 | } | |
eb39c880 MS |
593 | |
594 | return 0; | |
595 | } | |
596 | early_param("fadump", early_fadump_param); | |
597 | ||
81d9eca5 HB |
598 | /* |
599 | * Look for fadump_reserve_mem= cmdline option | |
600 | * TODO: Remove references to 'fadump_reserve_mem=' parameter, | |
601 | * the sooner 'crashkernel=' parameter is accustomed to. | |
602 | */ | |
603 | static int __init early_fadump_reserve_mem(char *p) | |
604 | { | |
605 | if (p) | |
606 | fw_dump.reserve_bootvar = memparse(p, &p); | |
607 | return 0; | |
608 | } | |
609 | early_param("fadump_reserve_mem", early_fadump_reserve_mem); | |
610 | ||
98b8cd7f | 611 | static int register_fw_dump(struct fadump_mem_struct *fdm) |
3ccc00a7 | 612 | { |
98b8cd7f | 613 | int rc, err; |
3ccc00a7 MS |
614 | unsigned int wait_time; |
615 | ||
616 | pr_debug("Registering for firmware-assisted kernel dump...\n"); | |
617 | ||
618 | /* TODO: Add upper time limit for the delay */ | |
619 | do { | |
620 | rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL, | |
621 | FADUMP_REGISTER, fdm, | |
622 | sizeof(struct fadump_mem_struct)); | |
623 | ||
624 | wait_time = rtas_busy_delay_time(rc); | |
625 | if (wait_time) | |
626 | mdelay(wait_time); | |
627 | ||
628 | } while (wait_time); | |
629 | ||
98b8cd7f | 630 | err = -EIO; |
3ccc00a7 | 631 | switch (rc) { |
98b8cd7f MS |
632 | default: |
633 | pr_err("Failed to register. Unknown Error(%d).\n", rc); | |
634 | break; | |
3ccc00a7 MS |
635 | case -1: |
636 | printk(KERN_ERR "Failed to register firmware-assisted kernel" | |
637 | " dump. Hardware Error(%d).\n", rc); | |
638 | break; | |
639 | case -3: | |
a5a05b91 | 640 | if (!is_boot_memory_area_contiguous()) |
f86593be MS |
641 | pr_err("Can't have holes in boot memory area while registering fadump\n"); |
642 | else if (!is_reserved_memory_area_contiguous()) | |
643 | pr_err("Can't have holes in reserved memory area while" | |
644 | " registering fadump\n"); | |
a5a05b91 | 645 | |
3ccc00a7 MS |
646 | printk(KERN_ERR "Failed to register firmware-assisted kernel" |
647 | " dump. Parameter Error(%d).\n", rc); | |
98b8cd7f | 648 | err = -EINVAL; |
3ccc00a7 MS |
649 | break; |
650 | case -9: | |
651 | printk(KERN_ERR "firmware-assisted kernel dump is already " | |
652 | " registered."); | |
653 | fw_dump.dump_registered = 1; | |
98b8cd7f | 654 | err = -EEXIST; |
3ccc00a7 MS |
655 | break; |
656 | case 0: | |
657 | printk(KERN_INFO "firmware-assisted kernel dump registration" | |
658 | " is successful\n"); | |
659 | fw_dump.dump_registered = 1; | |
98b8cd7f | 660 | err = 0; |
3ccc00a7 MS |
661 | break; |
662 | } | |
98b8cd7f | 663 | return err; |
3ccc00a7 MS |
664 | } |
665 | ||
ebaeb5ae MS |
666 | void crash_fadump(struct pt_regs *regs, const char *str) |
667 | { | |
668 | struct fadump_crash_info_header *fdh = NULL; | |
f2a5e8f0 | 669 | int old_cpu, this_cpu; |
ebaeb5ae | 670 | |
6fcd6baa | 671 | if (!should_fadump_crash()) |
ebaeb5ae MS |
672 | return; |
673 | ||
f2a5e8f0 MS |
674 | /* |
675 | * old_cpu == -1 means this is the first CPU which has come here, | |
676 | * go ahead and trigger fadump. | |
677 | * | |
678 | * old_cpu != -1 means some other CPU has already on it's way | |
679 | * to trigger fadump, just keep looping here. | |
680 | */ | |
681 | this_cpu = smp_processor_id(); | |
682 | old_cpu = cmpxchg(&crashing_cpu, -1, this_cpu); | |
683 | ||
684 | if (old_cpu != -1) { | |
685 | /* | |
686 | * We can't loop here indefinitely. Wait as long as fadump | |
687 | * is in force. If we race with fadump un-registration this | |
688 | * loop will break and then we go down to normal panic path | |
689 | * and reboot. If fadump is in force the first crashing | |
690 | * cpu will definitely trigger fadump. | |
691 | */ | |
692 | while (fw_dump.dump_registered) | |
693 | cpu_relax(); | |
694 | return; | |
695 | } | |
696 | ||
ebaeb5ae | 697 | fdh = __va(fw_dump.fadumphdr_addr); |
ebaeb5ae MS |
698 | fdh->crashing_cpu = crashing_cpu; |
699 | crash_save_vmcoreinfo(); | |
700 | ||
701 | if (regs) | |
702 | fdh->regs = *regs; | |
703 | else | |
704 | ppc_save_regs(&fdh->regs); | |
705 | ||
a0512164 | 706 | fdh->online_mask = *cpu_online_mask; |
ebaeb5ae MS |
707 | |
708 | /* Call ibm,os-term rtas call to trigger firmware assisted dump */ | |
709 | rtas_os_term((char *)str); | |
710 | } | |
711 | ||
712 | #define GPR_MASK 0xffffff0000000000 | |
713 | static inline int fadump_gpr_index(u64 id) | |
714 | { | |
715 | int i = -1; | |
716 | char str[3]; | |
717 | ||
718 | if ((id & GPR_MASK) == REG_ID("GPR")) { | |
719 | /* get the digits at the end */ | |
720 | id &= ~GPR_MASK; | |
721 | id >>= 24; | |
722 | str[2] = '\0'; | |
723 | str[1] = id & 0xff; | |
724 | str[0] = (id >> 8) & 0xff; | |
725 | sscanf(str, "%d", &i); | |
726 | if (i > 31) | |
727 | i = -1; | |
728 | } | |
729 | return i; | |
730 | } | |
731 | ||
732 | static inline void fadump_set_regval(struct pt_regs *regs, u64 reg_id, | |
733 | u64 reg_val) | |
734 | { | |
735 | int i; | |
736 | ||
737 | i = fadump_gpr_index(reg_id); | |
738 | if (i >= 0) | |
739 | regs->gpr[i] = (unsigned long)reg_val; | |
740 | else if (reg_id == REG_ID("NIA")) | |
741 | regs->nip = (unsigned long)reg_val; | |
742 | else if (reg_id == REG_ID("MSR")) | |
743 | regs->msr = (unsigned long)reg_val; | |
744 | else if (reg_id == REG_ID("CTR")) | |
745 | regs->ctr = (unsigned long)reg_val; | |
746 | else if (reg_id == REG_ID("LR")) | |
747 | regs->link = (unsigned long)reg_val; | |
748 | else if (reg_id == REG_ID("XER")) | |
749 | regs->xer = (unsigned long)reg_val; | |
750 | else if (reg_id == REG_ID("CR")) | |
751 | regs->ccr = (unsigned long)reg_val; | |
752 | else if (reg_id == REG_ID("DAR")) | |
753 | regs->dar = (unsigned long)reg_val; | |
754 | else if (reg_id == REG_ID("DSISR")) | |
755 | regs->dsisr = (unsigned long)reg_val; | |
756 | } | |
757 | ||
758 | static struct fadump_reg_entry* | |
759 | fadump_read_registers(struct fadump_reg_entry *reg_entry, struct pt_regs *regs) | |
760 | { | |
761 | memset(regs, 0, sizeof(struct pt_regs)); | |
762 | ||
408cddd9 HB |
763 | while (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUEND")) { |
764 | fadump_set_regval(regs, be64_to_cpu(reg_entry->reg_id), | |
765 | be64_to_cpu(reg_entry->reg_value)); | |
ebaeb5ae MS |
766 | reg_entry++; |
767 | } | |
768 | reg_entry++; | |
769 | return reg_entry; | |
770 | } | |
771 | ||
ebaeb5ae MS |
772 | static u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs) |
773 | { | |
774 | struct elf_prstatus prstatus; | |
775 | ||
776 | memset(&prstatus, 0, sizeof(prstatus)); | |
777 | /* | |
778 | * FIXME: How do i get PID? Do I really need it? | |
779 | * prstatus.pr_pid = ???? | |
780 | */ | |
781 | elf_core_copy_kernel_regs(&prstatus.pr_reg, regs); | |
22bd0177 HB |
782 | buf = append_elf_note(buf, CRASH_CORE_NOTE_NAME, NT_PRSTATUS, |
783 | &prstatus, sizeof(prstatus)); | |
ebaeb5ae MS |
784 | return buf; |
785 | } | |
786 | ||
787 | static void fadump_update_elfcore_header(char *bufp) | |
788 | { | |
789 | struct elfhdr *elf; | |
790 | struct elf_phdr *phdr; | |
791 | ||
792 | elf = (struct elfhdr *)bufp; | |
793 | bufp += sizeof(struct elfhdr); | |
794 | ||
795 | /* First note is a place holder for cpu notes info. */ | |
796 | phdr = (struct elf_phdr *)bufp; | |
797 | ||
798 | if (phdr->p_type == PT_NOTE) { | |
799 | phdr->p_paddr = fw_dump.cpu_notes_buf; | |
800 | phdr->p_offset = phdr->p_paddr; | |
801 | phdr->p_filesz = fw_dump.cpu_notes_buf_size; | |
802 | phdr->p_memsz = fw_dump.cpu_notes_buf_size; | |
803 | } | |
804 | return; | |
805 | } | |
806 | ||
807 | static void *fadump_cpu_notes_buf_alloc(unsigned long size) | |
808 | { | |
809 | void *vaddr; | |
810 | struct page *page; | |
811 | unsigned long order, count, i; | |
812 | ||
813 | order = get_order(size); | |
814 | vaddr = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, order); | |
815 | if (!vaddr) | |
816 | return NULL; | |
817 | ||
818 | count = 1 << order; | |
819 | page = virt_to_page(vaddr); | |
820 | for (i = 0; i < count; i++) | |
821 | SetPageReserved(page + i); | |
822 | return vaddr; | |
823 | } | |
824 | ||
825 | static void fadump_cpu_notes_buf_free(unsigned long vaddr, unsigned long size) | |
826 | { | |
827 | struct page *page; | |
828 | unsigned long order, count, i; | |
829 | ||
830 | order = get_order(size); | |
831 | count = 1 << order; | |
832 | page = virt_to_page(vaddr); | |
833 | for (i = 0; i < count; i++) | |
834 | ClearPageReserved(page + i); | |
835 | __free_pages(page, order); | |
836 | } | |
837 | ||
838 | /* | |
839 | * Read CPU state dump data and convert it into ELF notes. | |
840 | * The CPU dump starts with magic number "REGSAVE". NumCpusOffset should be | |
841 | * used to access the data to allow for additional fields to be added without | |
842 | * affecting compatibility. Each list of registers for a CPU starts with | |
843 | * "CPUSTRT" and ends with "CPUEND". Each register entry is of 16 bytes, | |
844 | * 8 Byte ASCII identifier and 8 Byte register value. The register entry | |
845 | * with identifier "CPUSTRT" and "CPUEND" contains 4 byte cpu id as part | |
846 | * of register value. For more details refer to PAPR document. | |
847 | * | |
848 | * Only for the crashing cpu we ignore the CPU dump data and get exact | |
849 | * state from fadump crash info structure populated by first kernel at the | |
850 | * time of crash. | |
851 | */ | |
852 | static int __init fadump_build_cpu_notes(const struct fadump_mem_struct *fdm) | |
853 | { | |
854 | struct fadump_reg_save_area_header *reg_header; | |
855 | struct fadump_reg_entry *reg_entry; | |
856 | struct fadump_crash_info_header *fdh = NULL; | |
857 | void *vaddr; | |
858 | unsigned long addr; | |
859 | u32 num_cpus, *note_buf; | |
860 | struct pt_regs regs; | |
861 | int i, rc = 0, cpu = 0; | |
862 | ||
863 | if (!fdm->cpu_state_data.bytes_dumped) | |
864 | return -EINVAL; | |
865 | ||
408cddd9 | 866 | addr = be64_to_cpu(fdm->cpu_state_data.destination_address); |
ebaeb5ae MS |
867 | vaddr = __va(addr); |
868 | ||
869 | reg_header = vaddr; | |
408cddd9 | 870 | if (be64_to_cpu(reg_header->magic_number) != REGSAVE_AREA_MAGIC) { |
ebaeb5ae MS |
871 | printk(KERN_ERR "Unable to read register save area.\n"); |
872 | return -ENOENT; | |
873 | } | |
874 | pr_debug("--------CPU State Data------------\n"); | |
408cddd9 HB |
875 | pr_debug("Magic Number: %llx\n", be64_to_cpu(reg_header->magic_number)); |
876 | pr_debug("NumCpuOffset: %x\n", be32_to_cpu(reg_header->num_cpu_offset)); | |
ebaeb5ae | 877 | |
408cddd9 HB |
878 | vaddr += be32_to_cpu(reg_header->num_cpu_offset); |
879 | num_cpus = be32_to_cpu(*((__be32 *)(vaddr))); | |
ebaeb5ae MS |
880 | pr_debug("NumCpus : %u\n", num_cpus); |
881 | vaddr += sizeof(u32); | |
882 | reg_entry = (struct fadump_reg_entry *)vaddr; | |
883 | ||
884 | /* Allocate buffer to hold cpu crash notes. */ | |
885 | fw_dump.cpu_notes_buf_size = num_cpus * sizeof(note_buf_t); | |
886 | fw_dump.cpu_notes_buf_size = PAGE_ALIGN(fw_dump.cpu_notes_buf_size); | |
887 | note_buf = fadump_cpu_notes_buf_alloc(fw_dump.cpu_notes_buf_size); | |
888 | if (!note_buf) { | |
889 | printk(KERN_ERR "Failed to allocate 0x%lx bytes for " | |
890 | "cpu notes buffer\n", fw_dump.cpu_notes_buf_size); | |
891 | return -ENOMEM; | |
892 | } | |
893 | fw_dump.cpu_notes_buf = __pa(note_buf); | |
894 | ||
895 | pr_debug("Allocated buffer for cpu notes of size %ld at %p\n", | |
896 | (num_cpus * sizeof(note_buf_t)), note_buf); | |
897 | ||
898 | if (fw_dump.fadumphdr_addr) | |
899 | fdh = __va(fw_dump.fadumphdr_addr); | |
900 | ||
901 | for (i = 0; i < num_cpus; i++) { | |
408cddd9 | 902 | if (be64_to_cpu(reg_entry->reg_id) != REG_ID("CPUSTRT")) { |
ebaeb5ae MS |
903 | printk(KERN_ERR "Unable to read CPU state data\n"); |
904 | rc = -ENOENT; | |
905 | goto error_out; | |
906 | } | |
907 | /* Lower 4 bytes of reg_value contains logical cpu id */ | |
408cddd9 | 908 | cpu = be64_to_cpu(reg_entry->reg_value) & FADUMP_CPU_ID_MASK; |
a0512164 | 909 | if (fdh && !cpumask_test_cpu(cpu, &fdh->online_mask)) { |
ebaeb5ae MS |
910 | SKIP_TO_NEXT_CPU(reg_entry); |
911 | continue; | |
912 | } | |
913 | pr_debug("Reading register data for cpu %d...\n", cpu); | |
914 | if (fdh && fdh->crashing_cpu == cpu) { | |
915 | regs = fdh->regs; | |
916 | note_buf = fadump_regs_to_elf_notes(note_buf, ®s); | |
917 | SKIP_TO_NEXT_CPU(reg_entry); | |
918 | } else { | |
919 | reg_entry++; | |
920 | reg_entry = fadump_read_registers(reg_entry, ®s); | |
921 | note_buf = fadump_regs_to_elf_notes(note_buf, ®s); | |
922 | } | |
923 | } | |
22bd0177 | 924 | final_note(note_buf); |
ebaeb5ae | 925 | |
b717d985 RS |
926 | if (fdh) { |
927 | pr_debug("Updating elfcore header (%llx) with cpu notes\n", | |
ebaeb5ae | 928 | fdh->elfcorehdr_addr); |
b717d985 RS |
929 | fadump_update_elfcore_header((char *)__va(fdh->elfcorehdr_addr)); |
930 | } | |
ebaeb5ae MS |
931 | return 0; |
932 | ||
933 | error_out: | |
934 | fadump_cpu_notes_buf_free((unsigned long)__va(fw_dump.cpu_notes_buf), | |
935 | fw_dump.cpu_notes_buf_size); | |
936 | fw_dump.cpu_notes_buf = 0; | |
937 | fw_dump.cpu_notes_buf_size = 0; | |
938 | return rc; | |
939 | ||
940 | } | |
941 | ||
2df173d9 MS |
942 | /* |
943 | * Validate and process the dump data stored by firmware before exporting | |
944 | * it through '/proc/vmcore'. | |
945 | */ | |
946 | static int __init process_fadump(const struct fadump_mem_struct *fdm_active) | |
947 | { | |
948 | struct fadump_crash_info_header *fdh; | |
ebaeb5ae | 949 | int rc = 0; |
2df173d9 MS |
950 | |
951 | if (!fdm_active || !fw_dump.fadumphdr_addr) | |
952 | return -EINVAL; | |
953 | ||
954 | /* Check if the dump data is valid. */ | |
408cddd9 | 955 | if ((be16_to_cpu(fdm_active->header.dump_status_flag) == FADUMP_ERROR_FLAG) || |
ebaeb5ae | 956 | (fdm_active->cpu_state_data.error_flags != 0) || |
2df173d9 MS |
957 | (fdm_active->rmr_region.error_flags != 0)) { |
958 | printk(KERN_ERR "Dump taken by platform is not valid\n"); | |
959 | return -EINVAL; | |
960 | } | |
ebaeb5ae MS |
961 | if ((fdm_active->rmr_region.bytes_dumped != |
962 | fdm_active->rmr_region.source_len) || | |
963 | !fdm_active->cpu_state_data.bytes_dumped) { | |
2df173d9 MS |
964 | printk(KERN_ERR "Dump taken by platform is incomplete\n"); |
965 | return -EINVAL; | |
966 | } | |
967 | ||
968 | /* Validate the fadump crash info header */ | |
969 | fdh = __va(fw_dump.fadumphdr_addr); | |
970 | if (fdh->magic_number != FADUMP_CRASH_INFO_MAGIC) { | |
971 | printk(KERN_ERR "Crash info header is not valid.\n"); | |
972 | return -EINVAL; | |
973 | } | |
974 | ||
ebaeb5ae MS |
975 | rc = fadump_build_cpu_notes(fdm_active); |
976 | if (rc) | |
977 | return rc; | |
978 | ||
2df173d9 MS |
979 | /* |
980 | * We are done validating dump info and elfcore header is now ready | |
981 | * to be exported. set elfcorehdr_addr so that vmcore module will | |
982 | * export the elfcore header through '/proc/vmcore'. | |
983 | */ | |
984 | elfcorehdr_addr = fdh->elfcorehdr_addr; | |
985 | ||
986 | return 0; | |
987 | } | |
988 | ||
1bd6a1c4 HB |
989 | static void free_crash_memory_ranges(void) |
990 | { | |
991 | kfree(crash_memory_ranges); | |
992 | crash_memory_ranges = NULL; | |
993 | crash_memory_ranges_size = 0; | |
994 | max_crash_mem_ranges = 0; | |
995 | } | |
996 | ||
997 | /* | |
998 | * Allocate or reallocate crash memory ranges array in incremental units | |
999 | * of PAGE_SIZE. | |
1000 | */ | |
1001 | static int allocate_crash_memory_ranges(void) | |
1002 | { | |
1003 | struct fad_crash_memory_ranges *new_array; | |
1004 | u64 new_size; | |
1005 | ||
1006 | new_size = crash_memory_ranges_size + PAGE_SIZE; | |
1007 | pr_debug("Allocating %llu bytes of memory for crash memory ranges\n", | |
1008 | new_size); | |
1009 | ||
1010 | new_array = krealloc(crash_memory_ranges, new_size, GFP_KERNEL); | |
1011 | if (new_array == NULL) { | |
1012 | pr_err("Insufficient memory for setting up crash memory ranges\n"); | |
1013 | free_crash_memory_ranges(); | |
1014 | return -ENOMEM; | |
1015 | } | |
1016 | ||
1017 | crash_memory_ranges = new_array; | |
1018 | crash_memory_ranges_size = new_size; | |
1019 | max_crash_mem_ranges = (new_size / | |
1020 | sizeof(struct fad_crash_memory_ranges)); | |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | static inline int fadump_add_crash_memory(unsigned long long base, | |
1025 | unsigned long long end) | |
2df173d9 | 1026 | { |
ced1bf52 HB |
1027 | u64 start, size; |
1028 | bool is_adjacent = false; | |
1029 | ||
2df173d9 | 1030 | if (base == end) |
1bd6a1c4 HB |
1031 | return 0; |
1032 | ||
ced1bf52 HB |
1033 | /* |
1034 | * Fold adjacent memory ranges to bring down the memory ranges/ | |
1035 | * PT_LOAD segments count. | |
1036 | */ | |
1037 | if (crash_mem_ranges) { | |
1038 | start = crash_memory_ranges[crash_mem_ranges - 1].base; | |
1039 | size = crash_memory_ranges[crash_mem_ranges - 1].size; | |
1bd6a1c4 | 1040 | |
ced1bf52 HB |
1041 | if ((start + size) == base) |
1042 | is_adjacent = true; | |
1043 | } | |
1044 | if (!is_adjacent) { | |
1045 | /* resize the array on reaching the limit */ | |
1046 | if (crash_mem_ranges == max_crash_mem_ranges) { | |
1047 | int ret; | |
1048 | ||
1049 | ret = allocate_crash_memory_ranges(); | |
1050 | if (ret) | |
1051 | return ret; | |
1052 | } | |
1053 | ||
1054 | start = base; | |
1055 | crash_memory_ranges[crash_mem_ranges].base = start; | |
1056 | crash_mem_ranges++; | |
1bd6a1c4 | 1057 | } |
2df173d9 | 1058 | |
ced1bf52 | 1059 | crash_memory_ranges[crash_mem_ranges - 1].size = (end - start); |
2df173d9 | 1060 | pr_debug("crash_memory_range[%d] [%#016llx-%#016llx], %#llx bytes\n", |
ced1bf52 | 1061 | (crash_mem_ranges - 1), start, end - 1, (end - start)); |
1bd6a1c4 | 1062 | return 0; |
2df173d9 MS |
1063 | } |
1064 | ||
1bd6a1c4 | 1065 | static int fadump_exclude_reserved_area(unsigned long long start, |
2df173d9 MS |
1066 | unsigned long long end) |
1067 | { | |
1068 | unsigned long long ra_start, ra_end; | |
1bd6a1c4 | 1069 | int ret = 0; |
2df173d9 MS |
1070 | |
1071 | ra_start = fw_dump.reserve_dump_area_start; | |
1072 | ra_end = ra_start + fw_dump.reserve_dump_area_size; | |
1073 | ||
1074 | if ((ra_start < end) && (ra_end > start)) { | |
1075 | if ((start < ra_start) && (end > ra_end)) { | |
1bd6a1c4 HB |
1076 | ret = fadump_add_crash_memory(start, ra_start); |
1077 | if (ret) | |
1078 | return ret; | |
1079 | ||
1080 | ret = fadump_add_crash_memory(ra_end, end); | |
2df173d9 | 1081 | } else if (start < ra_start) { |
1bd6a1c4 | 1082 | ret = fadump_add_crash_memory(start, ra_start); |
2df173d9 | 1083 | } else if (ra_end < end) { |
1bd6a1c4 | 1084 | ret = fadump_add_crash_memory(ra_end, end); |
2df173d9 MS |
1085 | } |
1086 | } else | |
1bd6a1c4 HB |
1087 | ret = fadump_add_crash_memory(start, end); |
1088 | ||
1089 | return ret; | |
2df173d9 MS |
1090 | } |
1091 | ||
1092 | static int fadump_init_elfcore_header(char *bufp) | |
1093 | { | |
1094 | struct elfhdr *elf; | |
1095 | ||
1096 | elf = (struct elfhdr *) bufp; | |
1097 | bufp += sizeof(struct elfhdr); | |
1098 | memcpy(elf->e_ident, ELFMAG, SELFMAG); | |
1099 | elf->e_ident[EI_CLASS] = ELF_CLASS; | |
1100 | elf->e_ident[EI_DATA] = ELF_DATA; | |
1101 | elf->e_ident[EI_VERSION] = EV_CURRENT; | |
1102 | elf->e_ident[EI_OSABI] = ELF_OSABI; | |
1103 | memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD); | |
1104 | elf->e_type = ET_CORE; | |
1105 | elf->e_machine = ELF_ARCH; | |
1106 | elf->e_version = EV_CURRENT; | |
1107 | elf->e_entry = 0; | |
1108 | elf->e_phoff = sizeof(struct elfhdr); | |
1109 | elf->e_shoff = 0; | |
d8bced27 DA |
1110 | #if defined(_CALL_ELF) |
1111 | elf->e_flags = _CALL_ELF; | |
1112 | #else | |
1113 | elf->e_flags = 0; | |
1114 | #endif | |
2df173d9 MS |
1115 | elf->e_ehsize = sizeof(struct elfhdr); |
1116 | elf->e_phentsize = sizeof(struct elf_phdr); | |
1117 | elf->e_phnum = 0; | |
1118 | elf->e_shentsize = 0; | |
1119 | elf->e_shnum = 0; | |
1120 | elf->e_shstrndx = 0; | |
1121 | ||
1122 | return 0; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Traverse through memblock structure and setup crash memory ranges. These | |
1127 | * ranges will be used create PT_LOAD program headers in elfcore header. | |
1128 | */ | |
1bd6a1c4 | 1129 | static int fadump_setup_crash_memory_ranges(void) |
2df173d9 MS |
1130 | { |
1131 | struct memblock_region *reg; | |
1132 | unsigned long long start, end; | |
1bd6a1c4 | 1133 | int ret; |
2df173d9 MS |
1134 | |
1135 | pr_debug("Setup crash memory ranges.\n"); | |
1136 | crash_mem_ranges = 0; | |
ced1bf52 | 1137 | |
2df173d9 MS |
1138 | /* |
1139 | * add the first memory chunk (RMA_START through boot_memory_size) as | |
1140 | * a separate memory chunk. The reason is, at the time crash firmware | |
1141 | * will move the content of this memory chunk to different location | |
1142 | * specified during fadump registration. We need to create a separate | |
1143 | * program header for this chunk with the correct offset. | |
1144 | */ | |
1bd6a1c4 HB |
1145 | ret = fadump_add_crash_memory(RMA_START, fw_dump.boot_memory_size); |
1146 | if (ret) | |
1147 | return ret; | |
2df173d9 MS |
1148 | |
1149 | for_each_memblock(memory, reg) { | |
1150 | start = (unsigned long long)reg->base; | |
1151 | end = start + (unsigned long long)reg->size; | |
a77af552 HB |
1152 | |
1153 | /* | |
1154 | * skip the first memory chunk that is already added (RMA_START | |
1155 | * through boot_memory_size). This logic needs a relook if and | |
1156 | * when RMA_START changes to a non-zero value. | |
1157 | */ | |
1158 | BUILD_BUG_ON(RMA_START != 0); | |
1159 | if (start < fw_dump.boot_memory_size) { | |
1160 | if (end > fw_dump.boot_memory_size) | |
1161 | start = fw_dump.boot_memory_size; | |
1162 | else | |
1163 | continue; | |
1164 | } | |
2df173d9 MS |
1165 | |
1166 | /* add this range excluding the reserved dump area. */ | |
1bd6a1c4 HB |
1167 | ret = fadump_exclude_reserved_area(start, end); |
1168 | if (ret) | |
1169 | return ret; | |
2df173d9 | 1170 | } |
1bd6a1c4 HB |
1171 | |
1172 | return 0; | |
2df173d9 MS |
1173 | } |
1174 | ||
d34c5f26 MS |
1175 | /* |
1176 | * If the given physical address falls within the boot memory region then | |
1177 | * return the relocated address that points to the dump region reserved | |
1178 | * for saving initial boot memory contents. | |
1179 | */ | |
1180 | static inline unsigned long fadump_relocate(unsigned long paddr) | |
1181 | { | |
1182 | if (paddr > RMA_START && paddr < fw_dump.boot_memory_size) | |
408cddd9 | 1183 | return be64_to_cpu(fdm.rmr_region.destination_address) + paddr; |
d34c5f26 MS |
1184 | else |
1185 | return paddr; | |
1186 | } | |
1187 | ||
2df173d9 MS |
1188 | static int fadump_create_elfcore_headers(char *bufp) |
1189 | { | |
1190 | struct elfhdr *elf; | |
1191 | struct elf_phdr *phdr; | |
1192 | int i; | |
1193 | ||
1194 | fadump_init_elfcore_header(bufp); | |
1195 | elf = (struct elfhdr *)bufp; | |
1196 | bufp += sizeof(struct elfhdr); | |
1197 | ||
ebaeb5ae MS |
1198 | /* |
1199 | * setup ELF PT_NOTE, place holder for cpu notes info. The notes info | |
1200 | * will be populated during second kernel boot after crash. Hence | |
1201 | * this PT_NOTE will always be the first elf note. | |
1202 | * | |
1203 | * NOTE: Any new ELF note addition should be placed after this note. | |
1204 | */ | |
1205 | phdr = (struct elf_phdr *)bufp; | |
1206 | bufp += sizeof(struct elf_phdr); | |
1207 | phdr->p_type = PT_NOTE; | |
1208 | phdr->p_flags = 0; | |
1209 | phdr->p_vaddr = 0; | |
1210 | phdr->p_align = 0; | |
1211 | ||
1212 | phdr->p_offset = 0; | |
1213 | phdr->p_paddr = 0; | |
1214 | phdr->p_filesz = 0; | |
1215 | phdr->p_memsz = 0; | |
1216 | ||
1217 | (elf->e_phnum)++; | |
1218 | ||
d34c5f26 MS |
1219 | /* setup ELF PT_NOTE for vmcoreinfo */ |
1220 | phdr = (struct elf_phdr *)bufp; | |
1221 | bufp += sizeof(struct elf_phdr); | |
1222 | phdr->p_type = PT_NOTE; | |
1223 | phdr->p_flags = 0; | |
1224 | phdr->p_vaddr = 0; | |
1225 | phdr->p_align = 0; | |
1226 | ||
1227 | phdr->p_paddr = fadump_relocate(paddr_vmcoreinfo_note()); | |
1228 | phdr->p_offset = phdr->p_paddr; | |
5203f499 | 1229 | phdr->p_memsz = phdr->p_filesz = VMCOREINFO_NOTE_SIZE; |
d34c5f26 MS |
1230 | |
1231 | /* Increment number of program headers. */ | |
1232 | (elf->e_phnum)++; | |
1233 | ||
2df173d9 MS |
1234 | /* setup PT_LOAD sections. */ |
1235 | ||
1236 | for (i = 0; i < crash_mem_ranges; i++) { | |
1237 | unsigned long long mbase, msize; | |
1238 | mbase = crash_memory_ranges[i].base; | |
1239 | msize = crash_memory_ranges[i].size; | |
1240 | ||
1241 | if (!msize) | |
1242 | continue; | |
1243 | ||
1244 | phdr = (struct elf_phdr *)bufp; | |
1245 | bufp += sizeof(struct elf_phdr); | |
1246 | phdr->p_type = PT_LOAD; | |
1247 | phdr->p_flags = PF_R|PF_W|PF_X; | |
1248 | phdr->p_offset = mbase; | |
1249 | ||
1250 | if (mbase == RMA_START) { | |
1251 | /* | |
1252 | * The entire RMA region will be moved by firmware | |
1253 | * to the specified destination_address. Hence set | |
1254 | * the correct offset. | |
1255 | */ | |
408cddd9 | 1256 | phdr->p_offset = be64_to_cpu(fdm.rmr_region.destination_address); |
2df173d9 MS |
1257 | } |
1258 | ||
1259 | phdr->p_paddr = mbase; | |
1260 | phdr->p_vaddr = (unsigned long)__va(mbase); | |
1261 | phdr->p_filesz = msize; | |
1262 | phdr->p_memsz = msize; | |
1263 | phdr->p_align = 0; | |
1264 | ||
1265 | /* Increment number of program headers. */ | |
1266 | (elf->e_phnum)++; | |
1267 | } | |
1268 | return 0; | |
1269 | } | |
1270 | ||
1271 | static unsigned long init_fadump_header(unsigned long addr) | |
1272 | { | |
1273 | struct fadump_crash_info_header *fdh; | |
1274 | ||
1275 | if (!addr) | |
1276 | return 0; | |
1277 | ||
1278 | fw_dump.fadumphdr_addr = addr; | |
1279 | fdh = __va(addr); | |
1280 | addr += sizeof(struct fadump_crash_info_header); | |
1281 | ||
1282 | memset(fdh, 0, sizeof(struct fadump_crash_info_header)); | |
1283 | fdh->magic_number = FADUMP_CRASH_INFO_MAGIC; | |
1284 | fdh->elfcorehdr_addr = addr; | |
ebaeb5ae MS |
1285 | /* We will set the crashing cpu id in crash_fadump() during crash. */ |
1286 | fdh->crashing_cpu = CPU_UNKNOWN; | |
2df173d9 MS |
1287 | |
1288 | return addr; | |
1289 | } | |
1290 | ||
98b8cd7f | 1291 | static int register_fadump(void) |
3ccc00a7 | 1292 | { |
2df173d9 MS |
1293 | unsigned long addr; |
1294 | void *vaddr; | |
1bd6a1c4 | 1295 | int ret; |
2df173d9 | 1296 | |
3ccc00a7 MS |
1297 | /* |
1298 | * If no memory is reserved then we can not register for firmware- | |
1299 | * assisted dump. | |
1300 | */ | |
1301 | if (!fw_dump.reserve_dump_area_size) | |
98b8cd7f | 1302 | return -ENODEV; |
3ccc00a7 | 1303 | |
1bd6a1c4 HB |
1304 | ret = fadump_setup_crash_memory_ranges(); |
1305 | if (ret) | |
1306 | return ret; | |
2df173d9 | 1307 | |
408cddd9 | 1308 | addr = be64_to_cpu(fdm.rmr_region.destination_address) + be64_to_cpu(fdm.rmr_region.source_len); |
2df173d9 MS |
1309 | /* Initialize fadump crash info header. */ |
1310 | addr = init_fadump_header(addr); | |
1311 | vaddr = __va(addr); | |
1312 | ||
1313 | pr_debug("Creating ELF core headers at %#016lx\n", addr); | |
1314 | fadump_create_elfcore_headers(vaddr); | |
1315 | ||
3ccc00a7 | 1316 | /* register the future kernel dump with firmware. */ |
98b8cd7f | 1317 | return register_fw_dump(&fdm); |
3ccc00a7 MS |
1318 | } |
1319 | ||
1320 | static int fadump_unregister_dump(struct fadump_mem_struct *fdm) | |
1321 | { | |
1322 | int rc = 0; | |
1323 | unsigned int wait_time; | |
1324 | ||
1325 | pr_debug("Un-register firmware-assisted dump\n"); | |
1326 | ||
1327 | /* TODO: Add upper time limit for the delay */ | |
1328 | do { | |
1329 | rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL, | |
1330 | FADUMP_UNREGISTER, fdm, | |
1331 | sizeof(struct fadump_mem_struct)); | |
1332 | ||
1333 | wait_time = rtas_busy_delay_time(rc); | |
1334 | if (wait_time) | |
1335 | mdelay(wait_time); | |
1336 | } while (wait_time); | |
1337 | ||
1338 | if (rc) { | |
1339 | printk(KERN_ERR "Failed to un-register firmware-assisted dump." | |
1340 | " unexpected error(%d).\n", rc); | |
1341 | return rc; | |
1342 | } | |
1343 | fw_dump.dump_registered = 0; | |
1344 | return 0; | |
1345 | } | |
1346 | ||
a4e92ce8 | 1347 | static int fadump_invalidate_dump(const struct fadump_mem_struct *fdm) |
b500afff MS |
1348 | { |
1349 | int rc = 0; | |
1350 | unsigned int wait_time; | |
1351 | ||
1352 | pr_debug("Invalidating firmware-assisted dump registration\n"); | |
1353 | ||
1354 | /* TODO: Add upper time limit for the delay */ | |
1355 | do { | |
1356 | rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL, | |
1357 | FADUMP_INVALIDATE, fdm, | |
1358 | sizeof(struct fadump_mem_struct)); | |
1359 | ||
1360 | wait_time = rtas_busy_delay_time(rc); | |
1361 | if (wait_time) | |
1362 | mdelay(wait_time); | |
1363 | } while (wait_time); | |
1364 | ||
1365 | if (rc) { | |
4a03749f | 1366 | pr_err("Failed to invalidate firmware-assisted dump registration. Unexpected error (%d).\n", rc); |
b5b1cfc5 | 1367 | return rc; |
b500afff MS |
1368 | } |
1369 | fw_dump.dump_active = 0; | |
1370 | fdm_active = NULL; | |
1371 | return 0; | |
1372 | } | |
1373 | ||
1374 | void fadump_cleanup(void) | |
1375 | { | |
1376 | /* Invalidate the registration only if dump is active. */ | |
1377 | if (fw_dump.dump_active) { | |
a4e92ce8 MS |
1378 | /* pass the same memory dump structure provided by platform */ |
1379 | fadump_invalidate_dump(fdm_active); | |
722cde76 MS |
1380 | } else if (fw_dump.dump_registered) { |
1381 | /* Un-register Firmware-assisted dump if it was registered. */ | |
1382 | fadump_unregister_dump(&fdm); | |
1bd6a1c4 | 1383 | free_crash_memory_ranges(); |
b500afff MS |
1384 | } |
1385 | } | |
1386 | ||
68fa6478 HB |
1387 | static void fadump_free_reserved_memory(unsigned long start_pfn, |
1388 | unsigned long end_pfn) | |
1389 | { | |
1390 | unsigned long pfn; | |
1391 | unsigned long time_limit = jiffies + HZ; | |
1392 | ||
1393 | pr_info("freeing reserved memory (0x%llx - 0x%llx)\n", | |
1394 | PFN_PHYS(start_pfn), PFN_PHYS(end_pfn)); | |
1395 | ||
1396 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { | |
1397 | free_reserved_page(pfn_to_page(pfn)); | |
1398 | ||
1399 | if (time_after(jiffies, time_limit)) { | |
1400 | cond_resched(); | |
1401 | time_limit = jiffies + HZ; | |
1402 | } | |
1403 | } | |
1404 | } | |
1405 | ||
1406 | /* | |
1407 | * Skip memory holes and free memory that was actually reserved. | |
1408 | */ | |
1409 | static void fadump_release_reserved_area(unsigned long start, unsigned long end) | |
1410 | { | |
1411 | struct memblock_region *reg; | |
1412 | unsigned long tstart, tend; | |
1413 | unsigned long start_pfn = PHYS_PFN(start); | |
1414 | unsigned long end_pfn = PHYS_PFN(end); | |
1415 | ||
1416 | for_each_memblock(memory, reg) { | |
1417 | tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); | |
1418 | tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); | |
1419 | if (tstart < tend) { | |
1420 | fadump_free_reserved_memory(tstart, tend); | |
1421 | ||
1422 | if (tend == end_pfn) | |
1423 | break; | |
1424 | ||
1425 | start_pfn = tend + 1; | |
1426 | } | |
1427 | } | |
1428 | } | |
1429 | ||
b500afff MS |
1430 | /* |
1431 | * Release the memory that was reserved in early boot to preserve the memory | |
1432 | * contents. The released memory will be available for general use. | |
1433 | */ | |
1434 | static void fadump_release_memory(unsigned long begin, unsigned long end) | |
1435 | { | |
b500afff MS |
1436 | unsigned long ra_start, ra_end; |
1437 | ||
1438 | ra_start = fw_dump.reserve_dump_area_start; | |
1439 | ra_end = ra_start + fw_dump.reserve_dump_area_size; | |
1440 | ||
68fa6478 HB |
1441 | /* |
1442 | * exclude the dump reserve area. Will reuse it for next | |
1443 | * fadump registration. | |
1444 | */ | |
1445 | if (begin < ra_end && end > ra_start) { | |
1446 | if (begin < ra_start) | |
1447 | fadump_release_reserved_area(begin, ra_start); | |
1448 | if (end > ra_end) | |
1449 | fadump_release_reserved_area(ra_end, end); | |
1450 | } else | |
1451 | fadump_release_reserved_area(begin, end); | |
b500afff MS |
1452 | } |
1453 | ||
1454 | static void fadump_invalidate_release_mem(void) | |
1455 | { | |
1456 | unsigned long reserved_area_start, reserved_area_end; | |
1457 | unsigned long destination_address; | |
1458 | ||
1459 | mutex_lock(&fadump_mutex); | |
1460 | if (!fw_dump.dump_active) { | |
1461 | mutex_unlock(&fadump_mutex); | |
1462 | return; | |
1463 | } | |
1464 | ||
408cddd9 | 1465 | destination_address = be64_to_cpu(fdm_active->cpu_state_data.destination_address); |
b500afff MS |
1466 | fadump_cleanup(); |
1467 | mutex_unlock(&fadump_mutex); | |
1468 | ||
1469 | /* | |
1470 | * Save the current reserved memory bounds we will require them | |
1471 | * later for releasing the memory for general use. | |
1472 | */ | |
1473 | reserved_area_start = fw_dump.reserve_dump_area_start; | |
1474 | reserved_area_end = reserved_area_start + | |
1475 | fw_dump.reserve_dump_area_size; | |
1476 | /* | |
1477 | * Setup reserve_dump_area_start and its size so that we can | |
1478 | * reuse this reserved memory for Re-registration. | |
1479 | */ | |
1480 | fw_dump.reserve_dump_area_start = destination_address; | |
1481 | fw_dump.reserve_dump_area_size = get_fadump_area_size(); | |
1482 | ||
1483 | fadump_release_memory(reserved_area_start, reserved_area_end); | |
1484 | if (fw_dump.cpu_notes_buf) { | |
1485 | fadump_cpu_notes_buf_free( | |
1486 | (unsigned long)__va(fw_dump.cpu_notes_buf), | |
1487 | fw_dump.cpu_notes_buf_size); | |
1488 | fw_dump.cpu_notes_buf = 0; | |
1489 | fw_dump.cpu_notes_buf_size = 0; | |
1490 | } | |
1491 | /* Initialize the kernel dump memory structure for FAD registration. */ | |
1492 | init_fadump_mem_struct(&fdm, fw_dump.reserve_dump_area_start); | |
1493 | } | |
1494 | ||
1495 | static ssize_t fadump_release_memory_store(struct kobject *kobj, | |
1496 | struct kobj_attribute *attr, | |
1497 | const char *buf, size_t count) | |
1498 | { | |
dcdc4679 MS |
1499 | int input = -1; |
1500 | ||
b500afff MS |
1501 | if (!fw_dump.dump_active) |
1502 | return -EPERM; | |
1503 | ||
dcdc4679 MS |
1504 | if (kstrtoint(buf, 0, &input)) |
1505 | return -EINVAL; | |
1506 | ||
1507 | if (input == 1) { | |
b500afff MS |
1508 | /* |
1509 | * Take away the '/proc/vmcore'. We are releasing the dump | |
1510 | * memory, hence it will not be valid anymore. | |
1511 | */ | |
2685f826 | 1512 | #ifdef CONFIG_PROC_VMCORE |
b500afff | 1513 | vmcore_cleanup(); |
2685f826 | 1514 | #endif |
b500afff MS |
1515 | fadump_invalidate_release_mem(); |
1516 | ||
1517 | } else | |
1518 | return -EINVAL; | |
1519 | return count; | |
1520 | } | |
1521 | ||
3ccc00a7 MS |
1522 | static ssize_t fadump_enabled_show(struct kobject *kobj, |
1523 | struct kobj_attribute *attr, | |
1524 | char *buf) | |
1525 | { | |
1526 | return sprintf(buf, "%d\n", fw_dump.fadump_enabled); | |
1527 | } | |
1528 | ||
1529 | static ssize_t fadump_register_show(struct kobject *kobj, | |
1530 | struct kobj_attribute *attr, | |
1531 | char *buf) | |
1532 | { | |
1533 | return sprintf(buf, "%d\n", fw_dump.dump_registered); | |
1534 | } | |
1535 | ||
1536 | static ssize_t fadump_register_store(struct kobject *kobj, | |
1537 | struct kobj_attribute *attr, | |
1538 | const char *buf, size_t count) | |
1539 | { | |
1540 | int ret = 0; | |
dcdc4679 | 1541 | int input = -1; |
3ccc00a7 MS |
1542 | |
1543 | if (!fw_dump.fadump_enabled || fdm_active) | |
1544 | return -EPERM; | |
1545 | ||
dcdc4679 MS |
1546 | if (kstrtoint(buf, 0, &input)) |
1547 | return -EINVAL; | |
1548 | ||
3ccc00a7 MS |
1549 | mutex_lock(&fadump_mutex); |
1550 | ||
dcdc4679 MS |
1551 | switch (input) { |
1552 | case 0: | |
3ccc00a7 | 1553 | if (fw_dump.dump_registered == 0) { |
3ccc00a7 MS |
1554 | goto unlock_out; |
1555 | } | |
1556 | /* Un-register Firmware-assisted dump */ | |
1557 | fadump_unregister_dump(&fdm); | |
1558 | break; | |
dcdc4679 | 1559 | case 1: |
3ccc00a7 | 1560 | if (fw_dump.dump_registered == 1) { |
0823c68b HB |
1561 | /* Un-register Firmware-assisted dump */ |
1562 | fadump_unregister_dump(&fdm); | |
3ccc00a7 MS |
1563 | } |
1564 | /* Register Firmware-assisted dump */ | |
98b8cd7f | 1565 | ret = register_fadump(); |
3ccc00a7 MS |
1566 | break; |
1567 | default: | |
1568 | ret = -EINVAL; | |
1569 | break; | |
1570 | } | |
1571 | ||
1572 | unlock_out: | |
1573 | mutex_unlock(&fadump_mutex); | |
1574 | return ret < 0 ? ret : count; | |
1575 | } | |
1576 | ||
1577 | static int fadump_region_show(struct seq_file *m, void *private) | |
1578 | { | |
1579 | const struct fadump_mem_struct *fdm_ptr; | |
1580 | ||
1581 | if (!fw_dump.fadump_enabled) | |
1582 | return 0; | |
1583 | ||
b500afff | 1584 | mutex_lock(&fadump_mutex); |
3ccc00a7 MS |
1585 | if (fdm_active) |
1586 | fdm_ptr = fdm_active; | |
b500afff MS |
1587 | else { |
1588 | mutex_unlock(&fadump_mutex); | |
3ccc00a7 | 1589 | fdm_ptr = &fdm; |
b500afff | 1590 | } |
3ccc00a7 MS |
1591 | |
1592 | seq_printf(m, | |
1593 | "CPU : [%#016llx-%#016llx] %#llx bytes, " | |
1594 | "Dumped: %#llx\n", | |
408cddd9 HB |
1595 | be64_to_cpu(fdm_ptr->cpu_state_data.destination_address), |
1596 | be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) + | |
1597 | be64_to_cpu(fdm_ptr->cpu_state_data.source_len) - 1, | |
1598 | be64_to_cpu(fdm_ptr->cpu_state_data.source_len), | |
1599 | be64_to_cpu(fdm_ptr->cpu_state_data.bytes_dumped)); | |
3ccc00a7 MS |
1600 | seq_printf(m, |
1601 | "HPTE: [%#016llx-%#016llx] %#llx bytes, " | |
1602 | "Dumped: %#llx\n", | |
408cddd9 HB |
1603 | be64_to_cpu(fdm_ptr->hpte_region.destination_address), |
1604 | be64_to_cpu(fdm_ptr->hpte_region.destination_address) + | |
1605 | be64_to_cpu(fdm_ptr->hpte_region.source_len) - 1, | |
1606 | be64_to_cpu(fdm_ptr->hpte_region.source_len), | |
1607 | be64_to_cpu(fdm_ptr->hpte_region.bytes_dumped)); | |
3ccc00a7 MS |
1608 | seq_printf(m, |
1609 | "DUMP: [%#016llx-%#016llx] %#llx bytes, " | |
1610 | "Dumped: %#llx\n", | |
408cddd9 HB |
1611 | be64_to_cpu(fdm_ptr->rmr_region.destination_address), |
1612 | be64_to_cpu(fdm_ptr->rmr_region.destination_address) + | |
1613 | be64_to_cpu(fdm_ptr->rmr_region.source_len) - 1, | |
1614 | be64_to_cpu(fdm_ptr->rmr_region.source_len), | |
1615 | be64_to_cpu(fdm_ptr->rmr_region.bytes_dumped)); | |
3ccc00a7 MS |
1616 | |
1617 | if (!fdm_active || | |
1618 | (fw_dump.reserve_dump_area_start == | |
408cddd9 | 1619 | be64_to_cpu(fdm_ptr->cpu_state_data.destination_address))) |
b500afff | 1620 | goto out; |
3ccc00a7 MS |
1621 | |
1622 | /* Dump is active. Show reserved memory region. */ | |
1623 | seq_printf(m, | |
1624 | " : [%#016llx-%#016llx] %#llx bytes, " | |
1625 | "Dumped: %#llx\n", | |
1626 | (unsigned long long)fw_dump.reserve_dump_area_start, | |
408cddd9 HB |
1627 | be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) - 1, |
1628 | be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) - | |
3ccc00a7 | 1629 | fw_dump.reserve_dump_area_start, |
408cddd9 | 1630 | be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) - |
3ccc00a7 | 1631 | fw_dump.reserve_dump_area_start); |
b500afff MS |
1632 | out: |
1633 | if (fdm_active) | |
1634 | mutex_unlock(&fadump_mutex); | |
3ccc00a7 MS |
1635 | return 0; |
1636 | } | |
1637 | ||
b500afff MS |
1638 | static struct kobj_attribute fadump_release_attr = __ATTR(fadump_release_mem, |
1639 | 0200, NULL, | |
1640 | fadump_release_memory_store); | |
3ccc00a7 MS |
1641 | static struct kobj_attribute fadump_attr = __ATTR(fadump_enabled, |
1642 | 0444, fadump_enabled_show, | |
1643 | NULL); | |
1644 | static struct kobj_attribute fadump_register_attr = __ATTR(fadump_registered, | |
1645 | 0644, fadump_register_show, | |
1646 | fadump_register_store); | |
1647 | ||
f6cee260 | 1648 | DEFINE_SHOW_ATTRIBUTE(fadump_region); |
3ccc00a7 MS |
1649 | |
1650 | static void fadump_init_files(void) | |
1651 | { | |
1652 | struct dentry *debugfs_file; | |
1653 | int rc = 0; | |
1654 | ||
1655 | rc = sysfs_create_file(kernel_kobj, &fadump_attr.attr); | |
1656 | if (rc) | |
1657 | printk(KERN_ERR "fadump: unable to create sysfs file" | |
1658 | " fadump_enabled (%d)\n", rc); | |
1659 | ||
1660 | rc = sysfs_create_file(kernel_kobj, &fadump_register_attr.attr); | |
1661 | if (rc) | |
1662 | printk(KERN_ERR "fadump: unable to create sysfs file" | |
1663 | " fadump_registered (%d)\n", rc); | |
1664 | ||
1665 | debugfs_file = debugfs_create_file("fadump_region", 0444, | |
1666 | powerpc_debugfs_root, NULL, | |
1667 | &fadump_region_fops); | |
1668 | if (!debugfs_file) | |
1669 | printk(KERN_ERR "fadump: unable to create debugfs file" | |
1670 | " fadump_region\n"); | |
b500afff MS |
1671 | |
1672 | if (fw_dump.dump_active) { | |
1673 | rc = sysfs_create_file(kernel_kobj, &fadump_release_attr.attr); | |
1674 | if (rc) | |
1675 | printk(KERN_ERR "fadump: unable to create sysfs file" | |
1676 | " fadump_release_mem (%d)\n", rc); | |
1677 | } | |
3ccc00a7 MS |
1678 | return; |
1679 | } | |
1680 | ||
1681 | /* | |
1682 | * Prepare for firmware-assisted dump. | |
1683 | */ | |
1684 | int __init setup_fadump(void) | |
1685 | { | |
1686 | if (!fw_dump.fadump_enabled) | |
1687 | return 0; | |
1688 | ||
1689 | if (!fw_dump.fadump_supported) { | |
1690 | printk(KERN_ERR "Firmware-assisted dump is not supported on" | |
1691 | " this hardware\n"); | |
1692 | return 0; | |
1693 | } | |
1694 | ||
1695 | fadump_show_config(); | |
2df173d9 MS |
1696 | /* |
1697 | * If dump data is available then see if it is valid and prepare for | |
1698 | * saving it to the disk. | |
1699 | */ | |
b500afff MS |
1700 | if (fw_dump.dump_active) { |
1701 | /* | |
1702 | * if dump process fails then invalidate the registration | |
1703 | * and release memory before proceeding for re-registration. | |
1704 | */ | |
1705 | if (process_fadump(fdm_active) < 0) | |
1706 | fadump_invalidate_release_mem(); | |
1707 | } | |
3ccc00a7 | 1708 | /* Initialize the kernel dump memory structure for FAD registration. */ |
2df173d9 | 1709 | else if (fw_dump.reserve_dump_area_size) |
3ccc00a7 MS |
1710 | init_fadump_mem_struct(&fdm, fw_dump.reserve_dump_area_start); |
1711 | fadump_init_files(); | |
1712 | ||
1713 | return 1; | |
1714 | } | |
1715 | subsys_initcall(setup_fadump); |