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, in particular 4KB-page/39,48-bits, 64KB-page/42 -bits with hibernate) The previous versions were also: Tested-by: Pratyush Anand <panand at redhat.com> (v29, mustang and seattle) Tested-by: James Morse <james.morse at arm.com> (v27, Juno) Changes for v32 (Feb 7, 2017) o isolate crash dump kernel memory as well as kernel text/data by using MEMBLOCK_MAP attribute to and then specifically map them in map_mem() (patch #1,6) o delete remove_pgd_mapping() and instead modify create_pgd_mapping() to allowing for unmapping a kernel mapping (patch #5) o correct a commit message as well as a comment in the source (patch#10) o other trivial changes after Mark's comments (patch#3,4) 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 (12): memblock: add memblock_clear_nomap() 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/pgtable-prot.h | 1 + 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 | 133 ++++++++++++++++++----- arch/arm64/kernel/setup.c | 7 +- arch/arm64/kernel/smp.c | 63 +++++++++++ arch/arm64/mm/init.c | 154 +++++++++++++++++++++++++++ arch/arm64/mm/mmu.c | 107 ++++++++++--------- include/linux/memblock.h | 2 + mm/memblock.c | 56 +++++++--- 18 files changed, 626 insertions(+), 93 deletions(-) create mode 100644 arch/arm64/kernel/crash_dump.c -- 2.11.1
