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| author | AKASHI Takahiro <takahiro.akashi@linaro.org> | 2017-04-03 11:24:35 +0900 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2017-04-05 18:28:50 +0100 |
| commit | 254a41c0ba0573fa23272945d3fbe39efcc5d07d (patch) | |
| tree | c61688a81414d3a4c0b5117ff6a7a24d23260f68 /arch/arm64/include | |
| parent | 98d2e1539b84abddce4b3c2ca8733f6aeacdee47 (diff) | |
| download | linux-254a41c0ba0573fa23272945d3fbe39efcc5d07d.tar.gz linux-254a41c0ba0573fa23272945d3fbe39efcc5d07d.tar.xz | |
arm64: hibernate: preserve kdump image around hibernation
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>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/kexec.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h index 04744dc5fb61..90aabbe893b7 100644 --- a/arch/arm64/include/asm/kexec.h +++ b/arch/arm64/include/asm/kexec.h @@ -43,6 +43,16 @@ static inline void crash_setup_regs(struct pt_regs *newregs, /* Empty routine needed to avoid build errors. */ } +#if defined(CONFIG_KEXEC_CORE) && defined(CONFIG_HIBERNATION) +extern bool crash_is_nosave(unsigned long pfn); +extern void crash_prepare_suspend(void); +extern void crash_post_resume(void); +#else +static inline bool crash_is_nosave(unsigned long pfn) {return false; } +static inline void crash_prepare_suspend(void) {} +static inline void crash_post_resume(void) {} +#endif + #endif /* __ASSEMBLY__ */ #endif |