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author | Guo Ren <ren_guo@c-sky.com> | 2023-06-05 11:06:59 +0000 |
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committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-06-08 07:16:35 -0700 |
commit | dc6667a4e7e36f283bcd0264a0be55adae4d6f86 (patch) | |
tree | 68271b1be301b40bc9d404d9c3e2653f79b5127d /arch | |
parent | 419d5d38ac5d79dfd899522274c872854cfe17ac (diff) | |
download | linux-stable-dc6667a4e7e36f283bcd0264a0be55adae4d6f86.tar.gz linux-stable-dc6667a4e7e36f283bcd0264a0be55adae4d6f86.tar.bz2 linux-stable-dc6667a4e7e36f283bcd0264a0be55adae4d6f86.zip |
riscv: Extending cpufeature.c to detect V-extension
Add V-extension into riscv_isa_ext_keys array and detect it with isa
string parsing.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Suggested-by: Vineet Gupta <vineetg@rivosinc.com>
Co-developed-by: Andy Chiu <andy.chiu@sifive.com>
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Tested-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Link: https://lore.kernel.org/r/20230605110724.21391-3-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/riscv/include/asm/hwcap.h | 1 | ||||
-rw-r--r-- | arch/riscv/include/asm/vector.h | 26 | ||||
-rw-r--r-- | arch/riscv/include/uapi/asm/hwcap.h | 1 | ||||
-rw-r--r-- | arch/riscv/kernel/cpufeature.c | 11 |
4 files changed, 39 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h index e0c40a4c63d5..574385930ba7 100644 --- a/arch/riscv/include/asm/hwcap.h +++ b/arch/riscv/include/asm/hwcap.h @@ -22,6 +22,7 @@ #define RISCV_ISA_EXT_m ('m' - 'a') #define RISCV_ISA_EXT_s ('s' - 'a') #define RISCV_ISA_EXT_u ('u' - 'a') +#define RISCV_ISA_EXT_v ('v' - 'a') /* * These macros represent the logical IDs of each multi-letter RISC-V ISA diff --git a/arch/riscv/include/asm/vector.h b/arch/riscv/include/asm/vector.h new file mode 100644 index 000000000000..bdbb05b70151 --- /dev/null +++ b/arch/riscv/include/asm/vector.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2020 SiFive + */ + +#ifndef __ASM_RISCV_VECTOR_H +#define __ASM_RISCV_VECTOR_H + +#include <linux/types.h> + +#ifdef CONFIG_RISCV_ISA_V + +#include <asm/hwcap.h> + +static __always_inline bool has_vector(void) +{ + return riscv_has_extension_unlikely(RISCV_ISA_EXT_v); +} + +#else /* ! CONFIG_RISCV_ISA_V */ + +static __always_inline bool has_vector(void) { return false; } + +#endif /* CONFIG_RISCV_ISA_V */ + +#endif /* ! __ASM_RISCV_VECTOR_H */ diff --git a/arch/riscv/include/uapi/asm/hwcap.h b/arch/riscv/include/uapi/asm/hwcap.h index 46dc3f5ee99f..c52bb7bbbabe 100644 --- a/arch/riscv/include/uapi/asm/hwcap.h +++ b/arch/riscv/include/uapi/asm/hwcap.h @@ -21,5 +21,6 @@ #define COMPAT_HWCAP_ISA_F (1 << ('F' - 'A')) #define COMPAT_HWCAP_ISA_D (1 << ('D' - 'A')) #define COMPAT_HWCAP_ISA_C (1 << ('C' - 'A')) +#define COMPAT_HWCAP_ISA_V (1 << ('V' - 'A')) #endif /* _UAPI_ASM_RISCV_HWCAP_H */ diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index b1d6b7e4b829..7aaf92fff64e 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -107,6 +107,7 @@ void __init riscv_fill_hwcap(void) isa2hwcap['f' - 'a'] = COMPAT_HWCAP_ISA_F; isa2hwcap['d' - 'a'] = COMPAT_HWCAP_ISA_D; isa2hwcap['c' - 'a'] = COMPAT_HWCAP_ISA_C; + isa2hwcap['v' - 'a'] = COMPAT_HWCAP_ISA_V; elf_hwcap = 0; @@ -267,6 +268,16 @@ void __init riscv_fill_hwcap(void) elf_hwcap &= ~COMPAT_HWCAP_ISA_F; } + if (elf_hwcap & COMPAT_HWCAP_ISA_V) { + /* + * ISA string in device tree might have 'v' flag, but + * CONFIG_RISCV_ISA_V is disabled in kernel. + * Clear V flag in elf_hwcap if CONFIG_RISCV_ISA_V is disabled. + */ + if (!IS_ENABLED(CONFIG_RISCV_ISA_V)) + elf_hwcap &= ~COMPAT_HWCAP_ISA_V; + } + memset(print_str, 0, sizeof(print_str)); for (i = 0, j = 0; i < NUM_ALPHA_EXTS; i++) if (riscv_isa[0] & BIT_MASK(i)) |