[PATCH] platform: generic: thead: improve tlb flush errata

[Anup Patel]

On Thu, Oct 12, 2023 at 7:24 AM Inochi Amaoto <inochiama at outlook.com> wrote:
>
> Flushing the tlb entries can solve the thead tlb problem, but flushing
> it by address will miss something and lead to a exception in some rare
> cases, and this is more common for sg2042.
>
> To solve this problem, flush the tlb entries by asid in the custom trap
> handler to ensure it is refreshed.
>
> Signed-off-by: Inochi Amaoto <inochiama at outlook.com>

Reviewed-by: Anup Patel <anup at brainfault.org>

Applied this patch to the riscv/opensbi repo.

Thanks,
Anup

> ---
> This patch based on the th1520 series patch.
> ---
>  platform/generic/thead/thead_c9xx_tlb_trap_handler.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/platform/generic/thead/thead_c9xx_tlb_trap_handler.S b/platform/generic/thead/thead_c9xx_tlb_trap_handler.S
> index 861c029..120daa7 100644
> --- a/platform/generic/thead/thead_c9xx_tlb_trap_handler.S
> +++ b/platform/generic/thead/thead_c9xx_tlb_trap_handler.S
> @@ -9,5 +9,5 @@
>         .align 3
>         .globl _thead_tlb_flush_fixup_trap_handler
>  _thead_tlb_flush_fixup_trap_handler:
> -       sfence.vma t0, zero
> +       sfence.vma zero, t0
>         j _trap_handler
> --
> 2.42.0
>
>
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