[PATCH -next v4 0/2] support allocating crashkernel above 4G explicitly on riscv

Chen Jiahao
2023-04-10T13:06:18Z

On riscv, the current crash kernel allocation logic is trying to
allocate within 32bit addressible memory region by default, if
failed, try to allocate without 4G restriction.

In need of saving DMA zone memory while allocating a relatively large
crash kernel region, allocating the reserved memory top down in
high memory, without overlapping the DMA zone, is a mature solution.
Hence this patchset introduces the parameter option crashkernel=X,[high,low].

One can reserve the crash kernel from high memory above DMA zone range
by explicitly passing "crashkernel=X,high"; or reserve a memory range
below 4G with "crashkernel=X,low". Besides, there are few rules need
to take notice:
1. "crashkernel=X,[high,low]" will be ignored if "crashkernel=size"
is specified.
2. "crashkernel=X,low" is valid only when "crashkernel=X,high" is passed
and there is enough memory to be allocated under 4G.
3. When allocating crashkernel above 4G and no "crashkernel=X,low" is
specified, a 128M low memory will be allocated automatically for
swiotlb bounce buffer.
See Documentation/admin-guide/kernel-parameters.txt for more information.

To verify loading the crashkernel, adapted kexec-tools is attached below:
https://github.com/chenjh005/kexec-tools/tree/build-test-riscv-v2

Following test cases have been performed as expected:
1) crashkernel=256M //low=256M
2) crashkernel=1G //low=1G
3) crashkernel=4G //high=4G, low=128M(default)
4) crashkernel=4G crashkernel=256M,high //high=4G, low=128M(default), high is ignored
5) crashkernel=4G crashkernel=256M,low //high=4G, low=128M(default), low is ignored
6) crashkernel=4G,high //high=4G, low=128M(default)
7) crashkernel=256M,low //low=0M, invalid
8) crashkernel=4G,high crashkernel=256M,low //high=4G, low=256M
9) crashkernel=4G,high crashkernel=4G,low //high=0M, low=0M, invalid
10) crashkernel=512M@0xd0000000 //low=512M
11) crashkernel=1G@0xe0000000 //high=0M, low=0M, no enough low memory, failed

Changes since [v4]:
1. Update some imprecise code comments for cmdline parsing.

Changes since [v3]:
1. Update to print warning and return explicitly on failure when
crashkernel=size@offset is specified. Not changing the result
in this case but making the logic more straightforward.
2. Some minor cleanup.

Changes since [v2]:
1. Update the allocation logic to ensure the high crashkernel
region is reserved strictly above dma32_phys_limit.
2. Clean up some minor format problems.

Chen Jiahao (2):
riscv: kdump: Implement crashkernel=X,[high,low]
docs: kdump: Update the crashkernel description for riscv

.../admin-guide/kernel-parameters.txt | 15 ++--
arch/riscv/kernel/setup.c | 5 ++
arch/riscv/mm/init.c | 71 +++++++++++++++++--
3 files changed, 79 insertions(+), 12 deletions(-)

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2.31.1