diff options
| author | Charlie Jenkins <[email protected]> | 2024-03-08 10:25:58 -0800 |
|---|---|---|
| committer | Palmer Dabbelt <[email protected]> | 2024-03-13 07:30:31 -0700 |
| commit | f413aae96cda059635910c462ede0a8f0385897c (patch) | |
| tree | 9422f48bf32e0773bcb23fbd183a6d3989e72d76 /arch/riscv/kernel/sys_hwprobe.c | |
| parent | 6e5ce7f2eae3c7c36dd1709efaac34820a34d538 (diff) | |
riscv: Set unaligned access speed at compile time
Introduce Kconfig options to set the kernel unaligned access support.
These options provide a non-portable alternative to the runtime
unaligned access probe.
To support this, the unaligned access probing code is moved into it's
own file and gated behind a new RISCV_PROBE_UNALIGNED_ACCESS_SUPPORT
option.
Signed-off-by: Charlie Jenkins <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Tested-by: Samuel Holland <[email protected]>
Link: https://lore.kernel.org/r/20240308-disable_misaligned_probe_config-v9-4-a388770ba0ce@rivosinc.com
Signed-off-by: Palmer Dabbelt <[email protected]>
Diffstat (limited to 'arch/riscv/kernel/sys_hwprobe.c')
| -rw-r--r-- | arch/riscv/kernel/sys_hwprobe.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c index a7c56b41efd2..8cae41a502dd 100644 --- a/arch/riscv/kernel/sys_hwprobe.c +++ b/arch/riscv/kernel/sys_hwprobe.c @@ -147,6 +147,7 @@ static bool hwprobe_ext0_has(const struct cpumask *cpus, unsigned long ext) return (pair.value & ext); } +#if defined(CONFIG_RISCV_PROBE_UNALIGNED_ACCESS) static u64 hwprobe_misaligned(const struct cpumask *cpus) { int cpu; @@ -169,6 +170,18 @@ static u64 hwprobe_misaligned(const struct cpumask *cpus) return perf; } +#else +static u64 hwprobe_misaligned(const struct cpumask *cpus) +{ + if (IS_ENABLED(CONFIG_RISCV_EFFICIENT_UNALIGNED_ACCESS)) + return RISCV_HWPROBE_MISALIGNED_FAST; + + if (IS_ENABLED(CONFIG_RISCV_EMULATED_UNALIGNED_ACCESS) && unaligned_ctl_available()) + return RISCV_HWPROBE_MISALIGNED_EMULATED; + + return RISCV_HWPROBE_MISALIGNED_SLOW; +} +#endif static void hwprobe_one_pair(struct riscv_hwprobe *pair, const struct cpumask *cpus) |