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authorAKASHI Takahiro <takahiro.akashi@linaro.org>2017-04-03 11:24:38 +0900
committerCatalin Marinas <catalin.marinas@arm.com>2017-04-05 18:31:38 +0100
commite62aaeac426ab1ddbdde524797b2a7835f606d91 (patch)
tree75448116e9973b7ae28fe063aa363b9ae2ea2c88 /arch/arm64/Kconfig
parentarm64: kdump: add VMCOREINFO's for user-space tools (diff)
downloadlinux-dev-e62aaeac426ab1ddbdde524797b2a7835f606d91.tar.xz
linux-dev-e62aaeac426ab1ddbdde524797b2a7835f606d91.zip
arm64: kdump: provide /proc/vmcore file
Arch-specific functions are added to allow for implementing a crash dump file interface, /proc/vmcore, which can be viewed as a ELF file. A user space tool, like kexec-tools, is responsible for allocating a separate region for the core's ELF header within crash kdump kernel memory and filling it in when executing kexec_load(). Then, its location will be advertised to crash dump kernel via a new device-tree property, "linux,elfcorehdr", and crash dump kernel preserves the region for later use with reserve_elfcorehdr() at boot time. On crash dump kernel, /proc/vmcore will access the primary kernel's memory with copy_oldmem_page(), which feeds the data page-by-page by ioremap'ing it since it does not reside in linear mapping on crash dump kernel. Meanwhile, elfcorehdr_read() is simple as the region is always mapped. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: James Morse <james.morse@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
-rw-r--r--arch/arm64/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 3741859765cf..e7f043efff41 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -736,6 +736,17 @@ config KEXEC
but it is independent of the system firmware. And like a reboot
you can start any kernel with it, not just Linux.
+config CRASH_DUMP
+ bool "Build kdump crash kernel"
+ help
+ Generate crash dump after being started by kexec. This should
+ be normally only set in special crash dump kernels which are
+ loaded in the main kernel with kexec-tools into a specially
+ reserved region and then later executed after a crash by
+ kdump/kexec.
+
+ For more details see Documentation/kdump/kdump.txt
+
config XEN_DOM0
def_bool y
depends on XEN