riscv: hwprobe: Add thead vendor extension probing

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Add a new hwprobe key "RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0" which
allows userspace to probe for the new RISCV_ISA_VENDOR_EXT_XTHEADVECTOR
vendor extension.

This new key will allow userspace code to probe for which thead vendor
extensions are supported. This API is modeled to be consistent with
RISCV_HWPROBE_KEY_IMA_EXT_0. The bitmask returned will have each bit
corresponding to a supported thead vendor extension of the cpumask set.
Just like RISCV_HWPROBE_KEY_IMA_EXT_0, this allows a userspace program
to determine all of the supported thead vendor extensions in one call.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Tested-by: Yangyu Chen <cyy@cyyself.name>
Link: https://lore.kernel.org/r/20241113-xtheadvector-v11-10-236c22791ef9@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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Charlie Jenkins 2024-11-13 18:21:16 -08:00 • committed by Palmer Dabbelt

parent d863910eab

commit a5ea53da65

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GPG key ID: 2E1319F35FBB1889

8 changed files with 89 additions and 3 deletions

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5

arch/riscv/include/asm/hwprobe.h

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19

arch/riscv/include/asm/vendor_extensions/thead_hwprobe.h

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arch/riscv/include/asm/vendor_extensions/vendor_hwprobe.h

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

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arch/riscv/include/uapi/asm/vendor/thead.h vendored

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arch/riscv/kernel/sys_hwprobe.c

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arch/riscv/kernel/vendor_extensions/Makefile

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arch/riscv/kernel/vendor_extensions/thead_hwprobe.c

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