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 >
