v26-specific note: After a comment from Rob[0], an idea of adding
"linux,usable-memory-range" was dropped. Instead, an existing
"reserved-memory" node will be used to limit usable memory ranges
on crash dump kernel.
This works not only on UEFI/ACPI systems but also on DT-only systems,
but if he really insists on using DT-specific "usable-memory" property,
I will post additional patches for kexec-tools. Those would be
redundant, though.
Even in that case, the kernel will not have to be changed.
This patch series adds kdump support on arm64.
There are some prerequisite patches [1],[2].
To load a crash-dump kernel to the systems, a series of patches to
kexec-tools, which have not yet been merged upstream, are needed.
Please always use my latest kdump patches, v3 [3].
To examine vmcore (/proc/vmcore) on a crash-dump kernel, you can use
- crash utility (coming v7.1.6 or later) [4]
(Necessary patches have already been queued in the master.)
[0] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-August/452582.html
[1] "arm64: mark reserved memblock regions explicitly in iomem"
http://lists.infradead.org/pipermail/linux-arm-kernel/2016-August/450433.html
[2] "efi: arm64: treat regions with WT/WC set but WB cleared as memory"
http://lists.infradead.org/pipermail/linux-arm-kernel/2016-August/451491.html
[3] T.B.D.
[4] https://github.com/crash-utility/crash.git
Changes for v26 (Sep 7, 2016):
o Use /reserved-memory instead of "linux,usable-memory-range" property
(dropping v25's patch#2 and #3, updating ex-patch#9.)
Changes for v25 (Aug 29, 2016):
o Rebase to Linux-4.8-rc4
o Use memremap() instead of ioremap_cache() [patch#5]
Changes for v24 (Aug 9, 2016):
o Rebase to Linux-4.8-rc1
o Update descriptions about newly added DT proerties
Changes for v23 (July 26, 2016):
o Move memblock_reserve() to a single place in reserve_crashkernel()
o Use cpu_park_loop() in ipi_cpu_crash_stop()
o Always enforce ARCH_LOW_ADDRESS_LIMIT to the memory range of crash kernel
o Re-implement fdt_enforce_memory_region() to remove non-reserve regions
(for ACPI) from usable memory at crash kernel
Changes for v22 (July 12, 2016):
o Export "crashkernel-base" and "crashkernel-size" via device-tree,
and add some descriptions about them in chosen.txt
o Rename "usable-memory" to "usable-memory-range" to avoid inconsistency
with powerpc's "usable-memory"
o Make cosmetic changes regarding "ifdef" usage
o Correct some wordings in kdump.txt
Changes for v21 (July 6, 2016):
o Remove kexec patches.
o Rebase to arm64's for-next/core (Linux-4.7-rc4 based).
o Clarify the description about kvm in kdump.txt.
See the following link [3] for older changes:
[3] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-June/438780.html
AKASHI Takahiro (8):
arm64: kdump: reserve memory for crash dump kernel
memblock: add memblock_cap_memory_range()
arm64: limit memory regions based on DT property, usable-memory-range
arm64: kdump: implement machine_crash_shutdown()
arm64: kdump: add kdump support
arm64: kdump: add VMCOREINFO's for user-space coredump tools
arm64: kdump: enable kdump in the arm64 defconfig
arm64: kdump: update a kernel doc
James Morse (1):
Documentation: dt: chosen properties for arm64 kdump
Documentation/devicetree/bindings/chosen.txt | 45 ++++++
Documentation/kdump/kdump.txt | 16 ++-
arch/arm64/Kconfig | 11 ++
arch/arm64/configs/defconfig | 1 +
arch/arm64/include/asm/hardirq.h | 2 +-
arch/arm64/include/asm/kexec.h | 41 +++++-
arch/arm64/include/asm/smp.h | 2 +
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/crash_dump.c | 71 ++++++++++
arch/arm64/kernel/machine_kexec.c | 67 ++++++++-
arch/arm64/kernel/setup.c | 7 +-
arch/arm64/kernel/smp.c | 63 +++++++++
arch/arm64/mm/init.c | 202 +++++++++++++++++++++++++++
include/linux/memblock.h | 1 +
mm/memblock.c | 28 ++++
15 files changed, 551 insertions(+), 7 deletions(-)
create mode 100644 arch/arm64/kernel/crash_dump.c
--
2.9.0
AKASHI Takahiro (6):
arm64: kdump: reserve memory for crash dump kernel
arm64: kdump: implement machine_crash_shutdown()
arm64: kdump: add kdump support
arm64: kdump: add VMCOREINFO's for user-space coredump tools
arm64: kdump: enable kdump in the arm64 defconfig
arm64: kdump: update a kernel doc
James Morse (1):
Documentation: dt: chosen properties for arm64 kdump
Documentation/devicetree/bindings/chosen.txt | 30 +++++
Documentation/kdump/kdump.txt | 16 ++-
arch/arm64/Kconfig | 11 ++
arch/arm64/configs/defconfig | 1 +
arch/arm64/include/asm/hardirq.h | 2 +-
arch/arm64/include/asm/kexec.h | 41 ++++++-
arch/arm64/include/asm/smp.h | 2 +
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/crash_dump.c | 71 ++++++++++++
arch/arm64/kernel/machine_kexec.c | 67 ++++++++++-
arch/arm64/kernel/setup.c | 7 +-
arch/arm64/kernel/smp.c | 63 ++++++++++
arch/arm64/mm/init.c | 167 +++++++++++++++++++++++++++
13 files changed, 472 insertions(+), 7 deletions(-)
create mode 100644 arch/arm64/kernel/crash_dump.c
--
2.9.0
