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Commit 3c57fb43 authored by Mika Westerberg's avatar Mika Westerberg Committed by Russell King
Browse files

ARM: 6116/1: kdump: reserve memory for crashkernel 



Implemented ARM support for command line option
"crashkernel=size@start" which allows user to reserve some memory
for a dump capture kernel.

Signed-off-by: default avatarMika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent f159f4ed

arch/arm/kernel/setup.c

+51 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/seq_file.h>

#include <linux/screen_info.h>

#include <linux/init.h>

#include <linux/kexec.h>

#include <linux/root_dev.h>

#include <linux/cpu.h>

#include <linux/interrupt.h>
@@ -680,6 +681,55 @@ static int __init customize_machine(void) 
}

arch_initcall(customize_machine);



#ifdef CONFIG_KEXEC

static inline unsigned long long get_total_mem(void)

{

	unsigned long total;



	total = max_low_pfn - min_low_pfn;

	return total << PAGE_SHIFT;

}



/**

 * reserve_crashkernel() - reserves memory are for crash kernel

 *

 * This function reserves memory area given in "crashkernel=" kernel command

 * line parameter. The memory reserved is used by a dump capture kernel when

 * primary kernel is crashing.

 */

static void __init reserve_crashkernel(void)

{

	unsigned long long crash_size, crash_base;

	unsigned long long total_mem;

	int ret;



	total_mem = get_total_mem();

	ret = parse_crashkernel(boot_command_line, total_mem,

				&crash_size, &crash_base);

	if (ret)

		return;



	ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);

	if (ret < 0) {

		printk(KERN_WARNING "crashkernel reservation failed - "

		       "memory is in use (0x%lx)\n", (unsigned long)crash_base);

		return;

	}



	printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "

	       "for crashkernel (System RAM: %ldMB)\n",

	       (unsigned long)(crash_size >> 20),

	       (unsigned long)(crash_base >> 20),

	       (unsigned long)(total_mem >> 20));



	crashk_res.start = crash_base;

	crashk_res.end = crash_base + crash_size - 1;

	insert_resource(&iomem_resource, &crashk_res);

}

#else

static inline void reserve_crashkernel(void) {}

#endif /* CONFIG_KEXEC */



void __init setup_arch(char **cmdline_p)

{

	struct tag *tags = (struct tag *)&init_tags;
@@ -739,6 +789,7 @@ void __init setup_arch(char **cmdline_p) 
#ifdef CONFIG_SMP

	smp_init_cpus();

#endif

	reserve_crashkernel();



	cpu_init();

	tcm_init();