riscv: Add Ziccamoa, Ziccif, Ziccrse, and Za64rs to cpufeature and hwprobe

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Add Ziccamoa, Ziccif, and Za64rs to riscv_isa_ext[] so they can be
parsed from devicetree/ACPI ISA strings. Ziccrse is already present
in cpufeature; this patch only adds its hwprobe exposure.

Expose all four extensions via hwprobe through new bits in
RISCV_HWPROBE_KEY_IMA_EXT_1 (RISCV_HWPROBE_EXT_ZICCAMOA, _ZICCIF,
_ZICCRSE, _ZA64RS), so userspace can probe each of these
RVA23U64-mandatory extensions individually.

Reviewed-by: Jesse Taube <jtaubepe@redhat.com>
Signed-off-by: Andrew Jones <andrew.jones@oss.qualcomm.com>
Signed-off-by: Guodong Xu <docular.xu@gmail.com>
Link: https://patch.msgid.link/20260701-rva23u64-hwprobe-v2-v5-6-2c61f94a695a@gmail.com
[pjw@kernel.org: updated to apply]
Signed-off-by: Paul Walmsley <pjw@kernel.org>

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Andrew Jones 2026-08-07 19:24:33 -06:00 • committed by Paul Walmsley

parent 3cd63bc30c

commit f61959a3a8

5 changed files with 30 additions and 0 deletions

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16

Documentation/arch/riscv/hwprobe.rst

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3

arch/riscv/include/asm/hwcap.h

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4

arch/riscv/include/uapi/asm/hwprobe.h

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3

arch/riscv/kernel/cpufeature.c

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4

arch/riscv/kernel/sys_hwprobe.c

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