On Mon, Mar 10, 2025 at 04:12:10PM +0100, Clément Léger wrote: > 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@xxxxxxxxxxxx> > --- > arch/riscv/kernel/sbi.c | 30 ++++++++++++++++++++++++++++-- > 1 file changed, 28 insertions(+), 2 deletions(-) > > diff --git a/arch/riscv/kernel/sbi.c b/arch/riscv/kernel/sbi.c > index 256910db1307..af8e2199e32d 100644 > --- a/arch/riscv/kernel/sbi.c > +++ b/arch/riscv/kernel/sbi.c > @@ -299,9 +299,19 @@ static int __sbi_rfence_v02(int fid, const struct cpumask *cpu_mask, > return 0; > } > > +static bool sbi_fwft_supported; > + > int sbi_fwft_get(u32 feature, unsigned long *value) > { > - return -EOPNOTSUPP; > + struct sbiret ret; > + > + if (!sbi_fwft_supported) > + return -EOPNOTSUPP; > + > + ret = sbi_ecall(SBI_EXT_FWFT, SBI_EXT_FWFT_GET, > + feature, 0, 0, 0, 0, 0); > + > + return sbi_err_map_linux_errno(ret.error); > } > > /** > @@ -314,7 +324,15 @@ int sbi_fwft_get(u32 feature, unsigned long *value) > */ > 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); sbi_err_map_linux_errno() doesn't know about SBI_ERR_DENIED_LOCKED. > } > > struct fwft_set_req { > @@ -389,6 +407,9 @@ static int sbi_fwft_feature_local_set(u32 feature, unsigned long value, > int sbi_fwft_all_cpus_set(u32 feature, unsigned long value, unsigned long flags, > bool revert_on_fail) > { > + if (!sbi_fwft_supported) > + return -EOPNOTSUPP; > + > if (feature & SBI_FWFT_GLOBAL_FEATURE_BIT) > return sbi_fwft_set(feature, value, flags); > > @@ -719,6 +740,11 @@ void __init sbi_init(void) > pr_info("SBI DBCN extension detected\n"); > sbi_debug_console_available = true; > } > + if ((sbi_spec_version >= sbi_mk_version(2, 0)) && Should check sbi_mk_version(3, 0) > + (sbi_probe_extension(SBI_EXT_FWFT) > 0)) { > + 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; > -- > 2.47.2 > Thanks, drew