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arm64: hibernate: preserve kdump image around hibernation

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Since arch_kexec_protect_crashkres() removes a mapping for crash dump
kernel image, the loaded data won't be preserved around hibernation.

In this patch, helper functions, crash_prepare_suspend()/
crash_post_resume(), are additionally called before/after hibernation so
that the relevant memory segments will be mapped again and preserved just
as the others are.

In addition, to minimize the size of hibernation image, crash_is_nosave()
is added to pfn_is_nosave() in order to recognize only the pages that hold
loaded crash dump kernel image as saveable. Hibernation excludes any pages
that are marked as Reserved and yet "nosave."

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
AKASHI Takahiro
2017-04-03 11:24:35 +09:00
committed by Catalin Marinas
parent 98d2e1539b
commit 254a41c0ba
4 changed files with 117 additions and 1 deletions
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27
arch/arm64/mm/init.c
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@@ -134,10 +134,35 @@ static void __init reserve_crashkernel(void)
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
}
static void __init kexec_reserve_crashkres_pages(void)
{
#ifdef CONFIG_HIBERNATION
phys_addr_t addr;
struct page *page;
if (!crashk_res.end)
return;
/*
* To reduce the size of hibernation image, all the pages are
* marked as Reserved initially.
*/
for (addr = crashk_res.start; addr < (crashk_res.end + 1);
addr += PAGE_SIZE) {
page = phys_to_page(addr);
SetPageReserved(page);
}
#endif
}
#else
static void __init reserve_crashkernel(void)
{
}
static void __init kexec_reserve_crashkres_pages(void)
{
}
#endif /* CONFIG_KEXEC_CORE */
/*
@@ -517,6 +542,8 @@ void __init mem_init(void)
/* this will put all unused low memory onto the freelists */
free_all_bootmem();
kexec_reserve_crashkres_pages();
mem_init_print_info(NULL);
#define MLK(b, t) b, t, ((t) - (b)) >> 10