Unverified Commit 162e4df1 authored by Andy Chiu's avatar Andy Chiu Committed by Palmer Dabbelt
Browse files

riscv: hwprobe: Add support for probing V in RISCV_HWPROBE_KEY_IMA_EXT_0 



Probing kernel support for Vector extension is available now. This only
add detection for V only. Extenions like Zvfh, Zk are not in this scope.

Signed-off-by: default avatarAndy Chiu <andy.chiu@sifive.com>
Reviewed-by: default avatarConor Dooley <conor.dooley@microchip.com>
Reviewed-by: default avatarEvan Green <evan@rivosinc.com>
Reviewed-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20230605110724.21391-4-andy.chiu@sifive.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent dc6667a4

Documentation/riscv/hwprobe.rst

+3 −0
Original line number Diff line number Diff line
@@ -64,6 +64,9 @@ The following keys are defined: 
  * :c:macro:`RISCV_HWPROBE_IMA_C`: The C extension is supported, as defined

    by version 2.2 of the RISC-V ISA manual.



  * :c:macro:`RISCV_HWPROBE_IMA_V`: The V extension is supported, as defined by

    version 1.0 of the RISC-V Vector extension manual.



* :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

+1 −0
Original line number Diff line number Diff line
@@ -25,6 +25,7 @@ struct riscv_hwprobe { 
#define RISCV_HWPROBE_KEY_IMA_EXT_0	4

#define		RISCV_HWPROBE_IMA_FD		(1 << 0)

#define		RISCV_HWPROBE_IMA_C		(1 << 1)

#define		RISCV_HWPROBE_IMA_V		(1 << 2)

#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_riscv.c

+4 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <asm/cpufeature.h>

#include <asm/hwprobe.h>

#include <asm/sbi.h>

#include <asm/vector.h>

#include <asm/switch_to.h>

#include <asm/uaccess.h>

#include <asm/unistd.h>
@@ -171,6 +172,9 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair, 
		if (riscv_isa_extension_available(NULL, c))

			pair->value |= RISCV_HWPROBE_IMA_C;



		if (has_vector())

			pair->value |= RISCV_HWPROBE_IMA_V;



		break;



	case RISCV_HWPROBE_KEY_CPUPERF_0: