[PATCH v31 00/12] add kdump support

AKASHI Takahiro
2017-02-01T12:42:18Z

This patch series adds kdump support on arm64.

To load a crash-dump kernel to the systems, a series of patches to
kexec-tools[1] are also needed. Please use the latest one, v5 [2].
For your convinience, you can pick them up from:
https://git.linaro.org/people/takahiro.akashi/linux-aarch64.git arm64/kdump
https://git.linaro.org/people/takahiro.akashi/kexec-tools.git arm64/kdump

To examine vmcore (/proc/vmcore) on a crash-dump kernel, you can use
- crash utility (v7.1.8 or later, i.e. master for now) [3]

I tested this patchset on fast model and hikey.
(under various configurations, including 4KB-page/39,48-bits, 64KB-page/
42-bits with hibernate)

The previous versions were also:
Tested-by: Pratyush Anand <panand@redhat.com> (v29, mustang and seattle)
Tested-by: James Morse <james.morse@arm.com> (v27, Juno)

Changes for v31 (Feb 1, 2017)
o add/use remove_pgd_mapping() instead of modifying (__)create_pgd_mapping()
to protect crash dump kernel memory (patch #4,5)
o fix an issue at the isolation of crash dump kernel memory in
map_mem()/__map_memblock(), adding map_crashkernel() (patch#5)
o preserve the contents of crash dump kernel memory around hibernation
(patch#6)

Changes for v30 (Jan 24, 2017)
o rebased to Linux-v4.10-rc5
o remove "linux,crashkernel-base/size" from exported device tree
o protect memory region for crash-dump kernel (adding patch#4,5)
o remove "in_crash_kexec" variable
o and other trivial changes

Changes for v29 (Dec 28, 2016)
o rebased to Linux-v4.10-rc1
o change asm constraints in crash_setup_regs() per Catalin

Changes for v28 (Nov 22, 2016)
o rebased to Linux-v4.9-rc6
o revamp patch #1 and merge memblock_cap_memory_range() with
memblock_mem_limit_remove_map()

Changes for v27 (Nov 1, 2016)
o rebased to Linux-v4.9-rc3
o revert v26 change, i.e. revive "linux,usable-memory-range" property
(patch #2/#3, updating patch #9)
o minor fixes per review comments (patch #3/#4/#6/#8)
o re-order patches and improve commit messages for readability

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 link [4] for older changes.

[1] https://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git
[2] http://lists.infradead.org/pipermail/kexec/2017-January/018002.html
[3] https://github.com/crash-utility/crash.git
[4] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-June/438780.html

AKASHI Takahiro (11):
memblock: add memblock_cap_memory_range()
arm64: limit memory regions based on DT property, usable-memory-range
arm64: kdump: reserve memory for crash dump kernel
arm64: mm: allow for unmapping part of kernel mapping
arm64: kdump: protect crash dump kernel memory
arm64: hibernate: preserve kdump image around hibernation
arm64: kdump: implement machine_crash_shutdown()
arm64: kdump: add VMCOREINFO's for user-space tools
arm64: kdump: provide /proc/vmcore file
arm64: kdump: enable kdump in defconfig
Documentation: kdump: describe arm64 port

James Morse (1):
Documentation: dt: chosen properties for arm64 kdump

Documentation/devicetree/bindings/chosen.txt | 37 ++++++
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 | 42 ++++++-
arch/arm64/include/asm/mmu.h | 2 +
arch/arm64/include/asm/smp.h | 2 +
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/crash_dump.c | 71 ++++++++++++
arch/arm64/kernel/hibernate.c | 13 +++
arch/arm64/kernel/machine_kexec.c | 129 +++++++++++++++++----
arch/arm64/kernel/setup.c | 7 +-
arch/arm64/kernel/smp.c | 63 ++++++++++
arch/arm64/mm/init.c | 150 ++++++++++++++++++++++++
arch/arm64/mm/mmu.c | 165 ++++++++++++++++++++++++++-
include/linux/memblock.h | 1 +
mm/memblock.c | 44 ++++---
18 files changed, 709 insertions(+), 48 deletions(-)
create mode 100644 arch/arm64/kernel/crash_dump.c

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2.11.0