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riscv: hwprobe: Add support for probing V in RISCV_HWPROBE_KEY_IMA_EXT_0

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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: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20230605110724.21391-4-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Andy Chiu
2023-06-05 11:07:00 +00:00
committed by Palmer Dabbelt
parent dc6667a4e7
commit 162e4df137
3 changed files with 8 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/riscv/hwprobe.rst
View File

@@ -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.

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

@@ -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)

4
arch/riscv/kernel/sys_riscv.c
View File

@@ -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: