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riscv: hwprobe: export Zfh[min] ISA extensions

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Export Zfh[min] ISA extensions[1] through hwprobe only if FPU support
is available.

Link: https://drive.google.com/file/d/1z3tQQLm5ALsAD77PM0l0CHnapxWCeVzP/view [1]
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Link: https://lore.kernel.org/r/20231114141256.126749-11-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Clément Léger 2023-11-14 09:12:46 -05:00 committed by Palmer Dabbelt
parent 11e8e1ee2c
commit bf4cd84111
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3 changed files with 13 additions and 0 deletions
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6
Documentation/arch/riscv/hwprobe.rst
View File

@ -140,6 +140,12 @@ The following keys are defined:
* :c:macro:`RISCV_HWPROBE_EXT_ZVKT`: The Zvkt extension is supported as
defined in version 1.0 of the RISC-V Cryptography Extensions Volume II.
* :c:macro:`RISCV_HWPROBE_EXT_ZFH`: The Zfh extension version 1.0 is supported
as defined in the RISC-V ISA manual.
* :c:macro:`RISCV_HWPROBE_EXT_ZFHMIN`: The Zfhmin extension version 1.0 is
supported as defined in the RISC-V ISA manual.
* :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance
information about the selected set of processors.

2
arch/riscv/include/uapi/asm/hwprobe.h
View File

@ -50,6 +50,8 @@ struct riscv_hwprobe {
#define RISCV_HWPROBE_EXT_ZVKSED (1 << 24)
#define RISCV_HWPROBE_EXT_ZVKSH (1 << 25)
#define RISCV_HWPROBE_EXT_ZVKT (1 << 26)
#define RISCV_HWPROBE_EXT_ZFH (1 << 27)
#define RISCV_HWPROBE_EXT_ZFHMIN (1 << 28)
#define RISCV_HWPROBE_KEY_CPUPERF_0 5
#define RISCV_HWPROBE_MISALIGNED_UNKNOWN (0 << 0)
#define RISCV_HWPROBE_MISALIGNED_EMULATED (1 << 0)

5
arch/riscv/kernel/sys_riscv.c
View File

@ -186,6 +186,11 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
EXT_KEY(ZVKSH);
EXT_KEY(ZVKT);
}
if (has_fpu()) {
EXT_KEY(ZFH);
EXT_KEY(ZFHMIN);
}
#undef EXT_KEY
}