Re: [PATCH v26 0/7] arm64: add kdump support

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

On Wed, Sep 07, 2016 at 01:29:02PM +0900, AKASHI Takahiro wrote:
>     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.

For kexec-tools, see:
http://lists.infradead.org/pipermail/kexec/2016-September/017158.html

-Takahiro AKASHI

> [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
> 

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