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| author | Jesse Taube <jesse@rivosinc.com> | 2024-10-17 21:00:22 +0200 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-10-18 21:38:34 +0200 |
| commit | e7c9d66e313bc0f7cb185c4972c3c9383a0da70f (patch) | |
| tree | bba7ec456197fa9ee5bc9aabb6e78b97180f83d6 /arch/riscv/kernel/sys_hwprobe.c | |
| parent | RISC-V: Detect unaligned vector accesses supported (diff) | |
| download | linux-e7c9d66e313bc0f7cb185c4972c3c9383a0da70f.tar.xz linux-e7c9d66e313bc0f7cb185c4972c3c9383a0da70f.zip | |
RISC-V: Report vector unaligned access speed hwprobe
Detect if vector misaligned accesses are faster or slower than
equivalent vector byte accesses. This is useful for usermode to know
whether vector byte accesses or vector misaligned accesses have a better
bandwidth for operations like memcpy.
Signed-off-by: Jesse Taube <jesse@rivosinc.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20241017-jesse_unaligned_vector-v10-5-5b33500160f8@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/kernel/sys_hwprobe.c')
| -rw-r--r-- | arch/riscv/kernel/sys_hwprobe.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c index 6441baada36b..6673278e84d5 100644 --- a/arch/riscv/kernel/sys_hwprobe.c +++ b/arch/riscv/kernel/sys_hwprobe.c @@ -228,6 +228,12 @@ static u64 hwprobe_vec_misaligned(const struct cpumask *cpus) #else static u64 hwprobe_vec_misaligned(const struct cpumask *cpus) { + if (IS_ENABLED(CONFIG_RISCV_EFFICIENT_VECTOR_UNALIGNED_ACCESS)) + return RISCV_HWPROBE_MISALIGNED_VECTOR_FAST; + + if (IS_ENABLED(CONFIG_RISCV_SLOW_VECTOR_UNALIGNED_ACCESS)) + return RISCV_HWPROBE_MISALIGNED_VECTOR_SLOW; + return RISCV_HWPROBE_MISALIGNED_VECTOR_UNKNOWN; } #endif |