Commit 2dc80ab4 authored by Youling Tang's avatar Youling Tang Committed by Hongchen Zhang
Browse files

LoongArch: kdump: Add memory reservation for old kernel 

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I736HO



--------------------------------

After moving the old kernel memory reservation to elfcorehdr operation, avoid
the elfcorehdr space from being destroyed.

Signed-off-by: default avatarYouling Tang <tangyouling@loongson.cn>
parent 9815551f

arch/loongarch/kernel/setup.c

+35 −10
Original line number Diff line number Diff line
@@ -69,6 +69,8 @@ EXPORT_SYMBOL(cpu_data); 
struct loongson_board_info b_info;

static const char dmi_empty_string[] = "        ";



static phys_addr_t crashmem_start, crashmem_size;



/*

 * Setup information

 *
@@ -206,6 +208,15 @@ static int __init early_parse_mem(char *p) 
		return -EINVAL;

	}



	start = 0;

	size = memparse(p, &p);

	if (*p == '@')

		start = memparse(p + 1, &p);

	else {

		pr_err("Invalid format!\n");

		return -EINVAL;

	}



	/*

	 * If a user specifies memory size, we

	 * blow away any automatically generated
@@ -213,16 +224,14 @@ static int __init early_parse_mem(char *p) 
	 */

	if (usermem == 0) {

		usermem = 1;

		if (!strstr(boot_command_line, "elfcorehdr")) {

			memblock_remove(memblock_start_of_DRAM(),

				memblock_end_of_DRAM() - memblock_start_of_DRAM());

		} else {

			crashmem_start = start;

			crashmem_size = size;

			return 0;

		}

	start = 0;

	size = memparse(p, &p);

	if (*p == '@')

		start = memparse(p + 1, &p);

	else {

		pr_err("Invalid format!\n");

		return -EINVAL;

	}



	if (!IS_ENABLED(CONFIG_NUMA))
@@ -369,10 +378,26 @@ static void __init bootcmdline_init(char **cmdline_p) 
	*cmdline_p = boot_command_line;

}



/*

 * After the kdump operation is performed to enter the capture kernel, the

 * memory area used by the previous production kernel should be reserved to

 * avoid destroy to the captured data.

 */

static void reserve_oldmem_region(void)

{

#ifdef CONFIG_CRASH_DUMP

	if (!is_kdump_kernel())

		return;



	memblock_cap_memory_range(crashmem_start, crashmem_size);

#endif

}



void __init platform_init(void)

{

	arch_reserve_vmcore();

	arch_parse_crashkernel();

	reserve_oldmem_region();



#ifdef CONFIG_ACPI_TABLE_UPGRADE

	acpi_table_upgrade();