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riscv: hwprobe: export Zfa ISA extension

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Export Zfa ISA extension[1] through hwprobe.

Link: https://drive.google.com/file/d/1VT6QIggpb59-8QRV266dEE4T8FZTxGq4/view [1]
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Link: https://lore.kernel.org/r/20231114141256.126749-20-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Clément Léger 2023-11-14 09:12:55 -05:00 committed by Palmer Dabbelt
parent fe987e84b0
commit dc6ccb21f4
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3 changed files with 6 additions and 0 deletions
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4
Documentation/arch/riscv/hwprobe.rst
View File

@ -157,6 +157,10 @@ The following keys are defined:
defined in the RISC-V Vector manual starting from commit e2ccd0548d6c
("Remove draft warnings from Zvfh[min]").
* :c:macro:`RISCV_HWPROBE_EXT_ZFA`: The Zfa extension is supported as
defined in the RISC-V ISA manual starting from commit 056b6ff467c7
("Zfa is ratified").
* :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance
information about the selected set of processors.

1
arch/riscv/include/uapi/asm/hwprobe.h
View File

@ -55,6 +55,7 @@ struct riscv_hwprobe {
#define RISCV_HWPROBE_EXT_ZIHINTNTL (1 << 29)
#define RISCV_HWPROBE_EXT_ZVFH (1 << 30)
#define RISCV_HWPROBE_EXT_ZVFHMIN (1 << 31)
#define RISCV_HWPROBE_EXT_ZFA (1ULL << 32)
#define RISCV_HWPROBE_KEY_CPUPERF_0 5
#define RISCV_HWPROBE_MISALIGNED_UNKNOWN (0 << 0)
#define RISCV_HWPROBE_MISALIGNED_EMULATED (1 << 0)

1
arch/riscv/kernel/sys_riscv.c
View File

@ -193,6 +193,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
if (has_fpu()) {
EXT_KEY(ZFH);
EXT_KEY(ZFHMIN);
EXT_KEY(ZFA);
}
#undef EXT_KEY
}