On 10/18/2016 09:26 AM, AKASHI Takahiro wrote:

Ruslan,

On Mon, Oct 17, 2016 at 06:41:01PM +0300, Ruslan Bilovol wrote:

quoted

Hi,

On 09/07/2016 07:29 AM, AKASHI Takahiro wrote:

quoted

     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

Are you going to rebase your patch series onto v4.9-rc1 tag soon? I see

Yes, definitely as soon as possible! (actually I've done it.)
But before submitting a new version, I need to convince Rob (Herring)
that he would accept my old approach (v25) regarding specifying usable
memory for crash dump kernel:
    http://lists.infradead.org/pipermail/linux-arm-kernel/2016-September/459379.html

It looks like the patches got stuck on review.

Could you please share that rebased version of kernel and
kexec-tools (maybe even on Linaro private git repo), I'd like
to try it on our HW while review is in progress.

Thanks,
Ruslan