fadump.c (664b0bae0b87f69bc9deb098f5e0158b9cf18e04) fadump.c (b71a693d3db3abd1ddf7d29be967a1180c3ebb22)
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 *

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330 size += sizeof(struct elf_phdr); /* place holder for cpu notes */
331 /* Program headers for crash memory regions. */
332 size += sizeof(struct elf_phdr) * (memblock_num_regions(memory) + 2);
333
334 size = PAGE_ALIGN(size);
335 return size;
336}
337
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 *

--- 321 unchanged lines hidden (view full) ---

330 size += sizeof(struct elf_phdr); /* place holder for cpu notes */
331 /* Program headers for crash memory regions. */
332 size += sizeof(struct elf_phdr) * (memblock_num_regions(memory) + 2);
333
334 size = PAGE_ALIGN(size);
335 return size;
336}
337
338static void __init fadump_reserve_crash_area(unsigned long base,
339 unsigned long size)
340{
341 struct memblock_region *reg;
342 unsigned long mstart, mend, msize;
343
344 for_each_memblock(memory, reg) {
345 mstart = max_t(unsigned long, base, reg->base);
346 mend = reg->base + reg->size;
347 mend = min(base + size, mend);
348
349 if (mstart < mend) {
350 msize = mend - mstart;
351 memblock_reserve(mstart, msize);
352 pr_info("Reserved %ldMB of memory at %#016lx for saving crash dump\n",
353 (msize >> 20), mstart);
354 }
355 }
356}
357
338int __init fadump_reserve_mem(void)
339{
340 unsigned long base, size, memory_boundary;
341
342 if (!fw_dump.fadump_enabled)
343 return 0;
344
345 if (!fw_dump.fadump_supported) {

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375 " dump, now %#016llx\n", memory_limit);
376 }
377 if (memory_limit)
378 memory_boundary = memory_limit;
379 else
380 memory_boundary = memblock_end_of_DRAM();
381
382 if (fw_dump.dump_active) {
358int __init fadump_reserve_mem(void)
359{
360 unsigned long base, size, memory_boundary;
361
362 if (!fw_dump.fadump_enabled)
363 return 0;
364
365 if (!fw_dump.fadump_supported) {

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395 " dump, now %#016llx\n", memory_limit);
396 }
397 if (memory_limit)
398 memory_boundary = memory_limit;
399 else
400 memory_boundary = memblock_end_of_DRAM();
401
402 if (fw_dump.dump_active) {
383 printk(KERN_INFO "Firmware-assisted dump is active.\n");
403 pr_info("Firmware-assisted dump is active.\n");
404
384 /*
385 * If last boot has crashed then reserve all the memory
386 * above boot_memory_size so that we don't touch it until
387 * dump is written to disk by userspace tool. This memory
388 * will be released for general use once the dump is saved.
389 */
390 base = fw_dump.boot_memory_size;
391 size = memory_boundary - base;
405 /*
406 * If last boot has crashed then reserve all the memory
407 * above boot_memory_size so that we don't touch it until
408 * dump is written to disk by userspace tool. This memory
409 * will be released for general use once the dump is saved.
410 */
411 base = fw_dump.boot_memory_size;
412 size = memory_boundary - base;
392 memblock_reserve(base, size);
393 printk(KERN_INFO "Reserved %ldMB of memory at %ldMB "
394 "for saving crash dump\n",
395 (unsigned long)(size >> 20),
396 (unsigned long)(base >> 20));
413 fadump_reserve_crash_area(base, size);
397
398 fw_dump.fadumphdr_addr =
399 be64_to_cpu(fdm_active->rmr_region.destination_address) +
400 be64_to_cpu(fdm_active->rmr_region.source_len);
401 pr_debug("fadumphdr_addr = %p\n",
402 (void *) fw_dump.fadumphdr_addr);
403 } else {
404 size = get_fadump_area_size();

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415 fw_dump.fadumphdr_addr =
416 be64_to_cpu(fdm_active->rmr_region.destination_address) +
417 be64_to_cpu(fdm_active->rmr_region.source_len);
418 pr_debug("fadumphdr_addr = %p\n",
419 (void *) fw_dump.fadumphdr_addr);
420 } else {
421 size = get_fadump_area_size();

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