diff options
-rw-r--r-- | arch/arm64/mm/init.c | 44 |
1 files changed, 34 insertions, 10 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 66e70ca47680..c28c2c8483cc 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -69,6 +69,7 @@ phys_addr_t __ro_after_init arm64_dma_phys_limit; #define CRASH_ADDR_LOW_MAX arm64_dma_phys_limit #define CRASH_ADDR_HIGH_MAX (PHYS_MASK + 1) +#define CRASH_HIGH_SEARCH_BASE SZ_4G #define DEFAULT_CRASH_KERNEL_LOW_SIZE (128UL << 20) @@ -101,12 +102,13 @@ static int __init reserve_crashkernel_low(unsigned long long low_size) */ static void __init reserve_crashkernel(void) { - unsigned long long crash_base, crash_size; - unsigned long long crash_low_size = 0; + unsigned long long crash_low_size = 0, search_base = 0; unsigned long long crash_max = CRASH_ADDR_LOW_MAX; + unsigned long long crash_base, crash_size; char *cmdline = boot_command_line; - int ret; bool fixed_base = false; + bool high = false; + int ret; if (!IS_ENABLED(CONFIG_KEXEC_CORE)) return; @@ -129,7 +131,9 @@ static void __init reserve_crashkernel(void) else if (ret) return; + search_base = CRASH_HIGH_SEARCH_BASE; crash_max = CRASH_ADDR_HIGH_MAX; + high = true; } else if (ret || !crash_size) { /* The specified value is invalid */ return; @@ -140,31 +144,51 @@ static void __init reserve_crashkernel(void) /* User specifies base address explicitly. */ if (crash_base) { fixed_base = true; + search_base = crash_base; crash_max = crash_base + crash_size; } retry: crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, - crash_base, crash_max); + search_base, crash_max); if (!crash_base) { /* - * If the first attempt was for low memory, fall back to - * high memory, the minimum required low memory will be - * reserved later. + * For crashkernel=size[KMG]@offset[KMG], print out failure + * message if can't reserve the specified region. */ - if (!fixed_base && (crash_max == CRASH_ADDR_LOW_MAX)) { + if (fixed_base) { + pr_warn("crashkernel reservation failed - memory is in use.\n"); + return; + } + + /* + * For crashkernel=size[KMG], if the first attempt was for + * low memory, fall back to high memory, the minimum required + * low memory will be reserved later. + */ + if (!high && crash_max == CRASH_ADDR_LOW_MAX) { crash_max = CRASH_ADDR_HIGH_MAX; + search_base = CRASH_ADDR_LOW_MAX; crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE; goto retry; } + /* + * For crashkernel=size[KMG],high, if the first attempt was + * for high memory, fall back to low memory. + */ + if (high && crash_max == CRASH_ADDR_HIGH_MAX) { + crash_max = CRASH_ADDR_LOW_MAX; + search_base = 0; + goto retry; + } pr_warn("cannot allocate crashkernel (size:0x%llx)\n", crash_size); return; } - if ((crash_base > CRASH_ADDR_LOW_MAX - crash_low_size) && - crash_low_size && reserve_crashkernel_low(crash_low_size)) { + if ((crash_base >= CRASH_ADDR_LOW_MAX) && crash_low_size && + reserve_crashkernel_low(crash_low_size)) { memblock_phys_free(crash_base, crash_size); return; } |