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

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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: Mika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Mika Westerberg 2010-05-10 09:20:22 +01:00 committed by Russell King
parent f159f4ed55
commit 3c57fb43c8
1 changed files with 51 additions and 0 deletions
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51
arch/arm/kernel/setup.c
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@ -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();