Unverified Commit 0ad70db5 authored by Clément Léger's avatar Clément Léger Committed by Palmer Dabbelt
Browse files

riscv: hwprobe: export Zca, Zcf, Zcd and Zcb ISA extensions 



Export Zca, Zcf, Zcd and Zcb ISA extension through hwprobe.

Signed-off-by: default avatarClément Léger <cleger@rivosinc.com>
Reviewed-by: default avatarCharlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20240619113529.676940-10-cleger@rivosinc.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent ba4cd855

Documentation/arch/riscv/hwprobe.rst

+20 −0
Original line number Diff line number Diff line
@@ -211,6 +211,26 @@ The following keys are defined: 
       supported as defined in the RISC-V ISA manual starting from commit

       58220614a5f ("Zimop is ratified/1.0").



  * :c:macro:`RISCV_HWPROBE_EXT_ZCA`: The Zca extension part of Zc* standard

       extensions for code size reduction, as ratified in commit 8be3419c1c0

       ("Zcf doesn't exist on RV64 as it contains no instructions") of

       riscv-code-size-reduction.



  * :c:macro:`RISCV_HWPROBE_EXT_ZCB`: The Zcb extension part of Zc* standard

       extensions for code size reduction, as ratified in commit 8be3419c1c0

       ("Zcf doesn't exist on RV64 as it contains no instructions") of

       riscv-code-size-reduction.



  * :c:macro:`RISCV_HWPROBE_EXT_ZCD`: The Zcd extension part of Zc* standard

       extensions for code size reduction, as ratified in commit 8be3419c1c0

       ("Zcf doesn't exist on RV64 as it contains no instructions") of

       riscv-code-size-reduction.



  * :c:macro:`RISCV_HWPROBE_EXT_ZCF`: The Zcf extension part of Zc* standard

       extensions for code size reduction, as ratified in commit 8be3419c1c0

       ("Zcf doesn't exist on RV64 as it contains no instructions") of

       riscv-code-size-reduction.



* :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance

  information about the selected set of processors.

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

+4 −0
Original line number Diff line number Diff line
@@ -66,6 +66,10 @@ struct riscv_hwprobe { 
#define		RISCV_HWPROBE_EXT_ZVE64F	(1ULL << 40)

#define		RISCV_HWPROBE_EXT_ZVE64D	(1ULL << 41)

#define		RISCV_HWPROBE_EXT_ZIMOP		(1ULL << 42)

#define		RISCV_HWPROBE_EXT_ZCA		(1ULL << 43)

#define		RISCV_HWPROBE_EXT_ZCB		(1ULL << 44)

#define		RISCV_HWPROBE_EXT_ZCD		(1ULL << 45)

#define		RISCV_HWPROBE_EXT_ZCF		(1ULL << 46)

#define RISCV_HWPROBE_KEY_CPUPERF_0	5

#define		RISCV_HWPROBE_MISALIGNED_UNKNOWN	(0 << 0)

#define		RISCV_HWPROBE_MISALIGNED_EMULATED	(1 << 0)

arch/riscv/kernel/sys_hwprobe.c

+4 −0
Original line number Diff line number Diff line
@@ -113,6 +113,8 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair, 
		EXT_KEY(ZICOND);

		EXT_KEY(ZIHINTPAUSE);

		EXT_KEY(ZIMOP);

		EXT_KEY(ZCA);

		EXT_KEY(ZCB);



		/*

		 * All the following extensions must depend on the kernel
@@ -142,6 +144,8 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair, 
			EXT_KEY(ZFH);

			EXT_KEY(ZFHMIN);

			EXT_KEY(ZFA);

			EXT_KEY(ZCD);

			EXT_KEY(ZCF);

		}

#undef EXT_KEY

	}