[RFC PATCH 03/12] lib: sbi_hart: enforce riscv,pmwid for Worlds ISA

[Pawandeep Oza]

On Fri, Jun 26, 2026 at 3:16 AM Yu-Chien Peter Lin <peter.lin at sifive.com> wrote:
>
> When Smwid/Smlwid extensions are detected during hart ISA detection,
> the riscv,pmwid device tree property is required to specify the M-mode
> WID default value.
>
> Signed-off-by: Yu-Chien Peter Lin <peter.lin at sifive.com>
> ---
>  lib/sbi/sbi_hart.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
> index 0c584bfc..cb0c66ea 100644
> --- a/lib/sbi/sbi_hart.c
> +++ b/lib/sbi/sbi_hart.c
> @@ -768,6 +768,19 @@ skip_smwiddeleg:
>         /* Mark hart feature detection done */
>         hfeatures->detected = true;
>
> +       /*
> +        * Validate M-mode WID default value: if Worlds ISA extensions
> +        * are present, riscv,pmwid must exist in DT.
> +        */
> +       if ((sbi_hart_has_extension(scratch, SBI_HART_EXT_SMWID) ||
> +            sbi_hart_has_extension(scratch, SBI_HART_EXT_SMLWID)) &&
> +            !hfeatures->has_pmwid) {
> +               sbi_printf("WARNING: hart%u has Worlds ISA extension but DT "
:%s/WARNING/ERROR/gc as this is causing panic/hang
> +                          "lacks riscv,pmwid.\n",
> +                          current_hartid());
> +               return SBI_EINVAL;
> +       }
> +
>         /*
>          * On platforms with Smepmp, the previous booting stage must
>          * enter OpenSBI with mseccfg.MML == 0. This allows OpenSBI
> --
> 2.43.7
>
>
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