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MIPS: kdump: Add support

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[ralf@linux-mips.org: Original patch by Maxim Uvarov <muvarov@gmail.com>
with plenty of further shining, polishing, debugging and testing by me.]

Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: kexec@lists.infradead.org
Cc: horms@verge.net.au
Patchwork: https://patchwork.linux-mips.org/patch/1025/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2012-10-11 18:14:58 +02:00
parent 98cdee0eae
commit 7aa1c8f47e
11 changed files with 396 additions and 9 deletions
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56
arch/mips/kernel/setup.c
View file

@ -22,6 +22,7 @@
#include <linux/console.h>
#include <linux/pfn.h>
#include <linux/debugfs.h>
#include <linux/kexec.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
@ -536,12 +537,64 @@ static void __init arch_mem_init(char **cmdline_p)
}
bootmem_init();
#ifdef CONFIG_KEXEC
if (crashk_res.start != crashk_res.end)
reserve_bootmem(crashk_res.start,
crashk_res.end - crashk_res.start + 1,
BOOTMEM_DEFAULT);
#endif
device_tree_init();
sparse_init();
plat_swiotlb_setup();
paging_init();
}
#ifdef CONFIG_KEXEC
static inline unsigned long long get_total_mem(void)
{
unsigned long long total;
total = max_pfn - min_low_pfn;
return total << PAGE_SHIFT;
}
static void __init mips_parse_crashkernel(void)
{
unsigned long long total_mem;
unsigned long long crash_size, crash_base;
int ret;
total_mem = get_total_mem();
ret = parse_crashkernel(boot_command_line, total_mem,
&crash_size, &crash_base);
if (ret != 0 || crash_size <= 0)
return;
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
}
static void __init request_crashkernel(struct resource *res)
{
int ret;
ret = request_resource(res, &crashk_res);
if (!ret)
pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
(unsigned long)((crashk_res.end -
crashk_res.start + 1) >> 20),
(unsigned long)(crashk_res.start >> 20));
}
#else /* !defined(CONFIG_KEXEC) */
static void __init mips_parse_crashkernel(void)
{
}
static void __init request_crashkernel(struct resource *res)
{
}
#endif /* !defined(CONFIG_KEXEC) */
static void __init resource_init(void)
{
int i;
@ -557,6 +610,8 @@ static void __init resource_init(void)
/*
* Request address space for all standard RAM.
*/
mips_parse_crashkernel();
for (i = 0; i < boot_mem_map.nr_map; i++) {
struct resource *res;
unsigned long start, end;
@ -593,6 +648,7 @@ static void __init resource_init(void)
*/
request_resource(res, &code_resource);
request_resource(res, &data_resource);
request_crashkernel(res);
}
}