[PATCH V2] RISC-V: Add support for riscv kexec/kdump on kexec-tools

[Xianting Tian]

在 2022/10/26 上午10:13, Xianting Tian 写道:
> Hi Simon
>
> thanks for the comments
>
> 在 2022/10/21 下午11:27, Simon Horman 写道:
>> On Thu, Oct 20, 2022 at 11:15:48AM +0800, Xianting Tian wrote:
>>> From: Nick Kossifidis <mick at ics.forth.gr>
>>>
>>> This patch adds support for loading the ELF kernel image. It parses
>>> the current/provided device tree to determine the system's memory
>>> layout, and /proc/iomem for the various kernel segments.
>>>
>>> This patch was firstly developed by Nick Kossifidis, and two fixes (
>>>     1: fail to find free memory area for dtb load when using initrd 
>>> image,
>>> lists.infradead.org/pipermail/linux-riscv/2022-August/018398.html;
>>>     2: fix memory range size calculation,
>>>         kexec/arch/riscv/crashdump-riscv.c:line 85
>>> ) are contributed by Yixun Lan, Xianting Tian.
>>>
>>> Tested on Qemu's rv64 virt machine and SoC of T-Head RISC-V Xuantie 
>>> 910 CPU.
>> Hi,
>>
>> thanks for some patch.
>>
>> Some minor feedback follows.
>>
>> Separately, I'll post a patch to add RISC-V builds to the github
>> workflow. If you could include that in V3 I'd be most grateful.
>>
>>> Tested-by: Yixun Lan <yixun.lan at gmail.com>
>>> Co-developed-by: Xianting Tian <xianting.tian at linux.alibaba.com>
>>> Co-developed-by: Yixun Lan <yixun.lan at gmail.com>
>>> Signed-off-by: Nick Kossifidis <mick at ics.forth.gr>
>> ...
>>
>>> +    ret = mem_regions_alloc_and_add(mem_ranges, start,
>>> +                    end - start, type);
>> mem_regions_alloc_and_add isn't always available.
>> f.e. on mips this causes a build failure.
>>
>> Ref: 
>> https://github.com/horms/kexec-tools/actions/runs/3298491143/jobs/5440677595
>
> As you know, mem_regions_sort, mem_regions_alloc_and_add are the 
> common funtions,
>
> The build error of mips is caused by this riscv patch?
>
> kexec/mem_regions.c:void mem_regions_sort(struct memory_ranges *ranges)
> kexec/mem_regions.h:void mem_regions_sort(struct memory_ranges *ranges);
>
>
> kexec/mem_regions.c:int mem_regions_alloc_and_add(struct memory_ranges 
> *ranges,
> kexec/mem_regions.h:int mem_regions_alloc_and_add(struct memory_ranges 
> *ranges,
>
>>
>> ...
>>
>>> +int dtb_get_memory_ranges(char *dtb, struct memory_ranges 
>>> *mem_ranges, struct memory_ranges *extra_ranges)
>>> +{
>> ...
>>
>>> +    mem_regions_sort(mem_ranges);
>> Likewise, mem_regions_sort isn't always available.
>> f.e. on mips this causes a build failure.
>>
>> ...
>>
>>> diff --git a/purgatory/arch/riscv/Makefile 
>>> b/purgatory/arch/riscv/Makefile
>>> new file mode 100644
>>> index 0000000..8bded71
>>> --- /dev/null
>>> +++ b/purgatory/arch/riscv/Makefile
>>> @@ -0,0 +1,7 @@
>>> +#
>>> +# Purgatory riscv
>>> +#
>>> +
>>> +riscv_PURGATORY_SRCS =
>>> +
>>> +dist += purgatory/arch/sh/Makefile $(riscv_PURGATORY_SRCS)
>> s/sh/riscv/
>>
>> Else the distribution tarball won't include this Makefile
>>
>> You can exercise this using:
>>    make distcheck DISTCHECK_CONFIGURE_FLAGS="--host=riscv64-linux-gnu"
> thanks, I will fix this.

the fix is in my personal gitee

https://gitee.com/xianting-tian/kexec-tools/commits/master