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riscv: sbi: add SBI FWFT extension calls

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Add FWFT extension calls. This will be ratified in SBI V3.0 hence, it is
provided as a separate commit that can be left out if needed.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20250523101932.1594077-6-cleger@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
This commit is contained in:
Clément Léger 2025-05-23 12:19:22 +02:00 committed by Palmer Dabbelt
parent 6d6d0641dc
commit c4a50db1e1
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 19 additions and 1 deletions
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20
arch/riscv/kernel/sbi.c
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@ -299,6 +299,8 @@ static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask,
return 0;
}
static bool sbi_fwft_supported;
struct fwft_set_req {
u32 feature;
unsigned long value;
@ -326,7 +328,15 @@ static void cpu_sbi_fwft_set(void *arg)
*/
int sbi_fwft_set(u32 feature, unsigned long value, unsigned long flags)
{
return -EOPNOTSUPP;
struct sbiret ret;
if (!sbi_fwft_supported)
return -EOPNOTSUPP;
ret = sbi_ecall(SBI_EXT_FWFT, SBI_EXT_FWFT_SET,
feature, value, flags, 0, 0, 0);
return sbi_err_map_linux_errno(ret.error);
}
/**
@ -348,6 +358,9 @@ int sbi_fwft_set_cpumask(const cpumask_t *mask, u32 feature,
.error = ATOMIC_INIT(0),
};
if (!sbi_fwft_supported)
return -EOPNOTSUPP;
if (feature & SBI_FWFT_GLOBAL_FEATURE_BIT)
return -EINVAL;
@ -679,6 +692,11 @@ void __init sbi_init(void)
pr_info("SBI DBCN extension detected\n");
sbi_debug_console_available = true;
}
if (sbi_spec_version >= sbi_mk_version(3, 0) &&
sbi_probe_extension(SBI_EXT_FWFT)) {
pr_info("SBI FWFT extension detected\n");
sbi_fwft_supported = true;
}
} else {
__sbi_set_timer = __sbi_set_timer_v01;
__sbi_send_ipi = __sbi_send_ipi_v01;