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

[Simon Horman]

On Wed, Oct 26, 2022 at 10:13:48AM +0800, Xianting Tian wrote:
> 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?

Yes, I think so.

The workflow passes on main: https://github.com/horms/kexec-tools/actions/runs/3344523519
But not with the riscv patch applied: https://github.com/horms/kexec-tools/tree/build-test-riscv-v2

> 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.

Thanks.