linux-kernel - Re: [PATCH V5 0/6] RISC-V fixups to work with crash tool

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Message-ID: <b3184653-7ef4-eec3-9ef6-a8449fe24323@microchip.com>
Date:   Tue, 9 Aug 2022 21:24:16 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <xianting.tian@...ux.alibaba.com>, <paul.walmsley@...ive.com>,
        <palmer@...belt.com>, <aou@...s.berkeley.edu>,
        <anup@...infault.org>, <heiko@...ech.de>, <guoren@...nel.org>,
        <mick@....forth.gr>, <alexandre.ghiti@...onical.com>,
        <bhe@...hat.com>, <vgoyal@...hat.com>, <dyoung@...hat.com>,
        <corbet@....net>, <Conor.Dooley@...rochip.com>
CC:     <kexec@...ts.infradead.org>, <linux-doc@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <crash-utility@...hat.com>, <huanyi.xj@...baba-inc.com>,
        <heinrich.schuchardt@...onical.com>, <k-hagio-ab@....com>,
        <hschauhan@...ltrace.org>, <yixun.lan@...il.com>
Subject: Re: [PATCH V5 0/6] RISC-V fixups to work with crash tool

On 09/08/2022 07:58, Xianting Tian wrote:
> Hi Palmer
> 
> Could you please help review this patch set?  thanks.

Hey Xianting,

Obviously I am not Palmer, but I left some comments on the
patchset. Sorry for the delay in getting back onto you on your
latest version, I got confused as to which versions I had reviewed.

Conor.

>  
> Crash-utility patch set is ready(acked by HAGIO KAZUHITO), now waiting the kernel patch set merged firstly.
> 
> 在 2022/8/2 下午8:18, Xianting Tian 写道:
>> I ever sent the patch 1 in the link:
>> https://patchwork.kernel.org/project/linux-riscv/patch/20220708073150.352830-3-xianting.tian@linux.alibaba.com/
>> And patch 2,3 in the link:
>> https://patchwork.kernel.org/project/linux-riscv/patch/20220714113300.367854-2-xianting.tian@linux.alibaba.com/
>> https://patchwork.kernel.org/project/linux-riscv/patch/20220714113300.367854-3-xianting.tian@linux.alibaba.com/
>>
>> This patch set just put these patches together, and with three new patch 4, 5, 6.
>> these six patches are the fixups for machine_kexec, kernel mode PC for vmcore
>> and improvements for vmcoreinfo, memory layout dump and fixup chedule out issue
>> in machine_crash_shutdown().
>>
>> The main changes in the six patchs as below,
>> Patch 1: use __smp_processor_id() instead of smp_processor_id() to cleanup
>>           the console prints.
>> Patch 2: Add VM layout, va bits, ram base to vmcoreinfo, which can simplify
>>           the development of crash tool as ARM64 already did
>>           (arch/arm64/kernel/crash_core.c).
>> Patch 3: Add modules to virtual kernel memory layout dump.
>> Patch 4: Fixup to get correct kernel mode PC for vmcore.
>> Patch 5: Updates vmcoreinfo.rst.
>> Patch 6: Fixup schedule out issue in machine_crash_shutdown()
>>
>> With these six patches(patch 2 is must), crash tool can work well to analyze
>> a vmcore. The patches for crash tool for RISCV64 is in the link:
>> https://lore.kernel.org/linux-riscv/20220801043040.2003264-1-xianting.tian@linux.alibaba.com/
>>
>> ------
>> Changes v1 -> v2:
>>   1, remove the patch "Add a fast call path of crash_kexec()" from this series
>>   of patches, as it already applied to riscv git.
>>   https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git/commit/?h=for-next&id=3f1901110a89b0e2e13adb2ac8d1a7102879ea98
>>   2, add 'Reviewed-by' based on the comments of v1.
>> Changes v2 -> v3:
>>   use "riscv" instead of "riscv64" in patch 5 subject line.
>> Changes v3 -> v4:
>>   use "riscv" instead of "riscv64" in the summary of patch 5 subject line.
>> Changes v4 -> v5:
>>   add a new patch "RISC-V: Fixup schedule out issue in machine_crash_shutdown()"
>>
>> Xianting Tian (6):
>>    RISC-V: use __smp_processor_id() instead of smp_processor_id()
>>    RISC-V: Add arch_crash_save_vmcoreinfo support
>>    riscv: Add modules to virtual kernel memory layout dump
>>    RISC-V: Fixup getting correct current pc
>>    riscv: crash_core: Export kernel vm layout, phys_ram_base
>>    RISC-V: Fixup schedule out issue in machine_crash_shutdown()
>>
>>   .../admin-guide/kdump/vmcoreinfo.rst          | 31 +++++++++++++++++++
>>   arch/riscv/kernel/Makefile                    |  1 +
>>   arch/riscv/kernel/crash_core.c                | 29 +++++++++++++++++
>>   arch/riscv/kernel/crash_save_regs.S           |  2 +-
>>   arch/riscv/kernel/machine_kexec.c             | 28 ++++++++++++++---
>>   arch/riscv/mm/init.c                          |  4 +++
>>   6 files changed, 89 insertions(+), 6 deletions(-)
>>   create mode 100644 arch/riscv/kernel/crash_core.c
>>