diff options
Diffstat (limited to 'arch/powerpc/kernel/fadump.c')
| -rw-r--r-- | arch/powerpc/kernel/fadump.c | 44 |
1 files changed, 39 insertions, 5 deletions
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 6f52a60bc212..645d9d4d9332 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -36,6 +36,7 @@ static struct fw_dump fw_dump; static void __init fadump_reserve_crash_area(u64 base); +#ifndef CONFIG_PRESERVE_FA_DUMP static DEFINE_MUTEX(fadump_mutex); struct fadump_mrange_info crash_mrange_info = { "crash", NULL, 0, 0, 0 }; struct fadump_mrange_info reserved_mrange_info = { "reserved", NULL, 0, 0, 0 }; @@ -439,11 +440,6 @@ error_out: return 0; } -unsigned long __init arch_reserved_kernel_pages(void) -{ - return memblock_reserved_size() / PAGE_SIZE; -} - /* Look for fadump= cmdline option. */ static int __init early_fadump_param(char *p) { @@ -1358,6 +1354,39 @@ int __init setup_fadump(void) return 1; } subsys_initcall(setup_fadump); +#else /* !CONFIG_PRESERVE_FA_DUMP */ + +/* Scan the Firmware Assisted dump configuration details. */ +int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname, + int depth, void *data) +{ + if ((depth != 1) || (strcmp(uname, "ibm,opal") != 0)) + return 0; + + opal_fadump_dt_scan(&fw_dump, node); + return 1; +} + +/* + * When dump is active but PRESERVE_FA_DUMP is enabled on the kernel, + * preserve crash data. The subsequent memory preserving kernel boot + * is likely to process this crash data. + */ +int __init fadump_reserve_mem(void) +{ + if (fw_dump.dump_active) { + /* + * If last boot has crashed then reserve all the memory + * above boot memory to preserve crash data. + */ + pr_info("Preserving crash data for processing in next boot.\n"); + fadump_reserve_crash_area(fw_dump.boot_mem_top); + } else + pr_debug("FADump-aware kernel..\n"); + + return 1; +} +#endif /* CONFIG_PRESERVE_FA_DUMP */ /* Preserve everything above the base address */ static void __init fadump_reserve_crash_area(u64 base) @@ -1382,3 +1411,8 @@ static void __init fadump_reserve_crash_area(u64 base) memblock_reserve(mstart, msize); } } + +unsigned long __init arch_reserved_kernel_pages(void) +{ + return memblock_reserved_size() / PAGE_SIZE; +} |