[PATCH v5 04/12] lib: sbi: Delegate PMU counter overflow interrupt to S mode

[Anup Patel]

On Tue, Nov 9, 2021 at 12:23 AM Atish Patra <atish.patra at wdc.com> wrote:
>
> OpenSBI doesn't handle PMU counters for now.
>
> Delegate the overflow counter to S-mode always.
>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> Reviewed-by: Anup Patel <anup.patel at wdc.com>
> Signed-off-by: Atish Patra <atish.patra at wdc.com>

Applied this patch to the riscv/opensbi repo.

Thanks,
Anup

> ---
>  include/sbi/riscv_encoding.h | 2 ++
>  lib/sbi/sbi_hart.c           | 3 +++
>  2 files changed, 5 insertions(+)
>
> diff --git a/include/sbi/riscv_encoding.h b/include/sbi/riscv_encoding.h
> index 14caa95d66de..ca6343537eba 100644
> --- a/include/sbi/riscv_encoding.h
> +++ b/include/sbi/riscv_encoding.h
> @@ -86,6 +86,7 @@
>  #define IRQ_VS_EXT                     10
>  #define IRQ_M_EXT                      11
>  #define IRQ_S_GEXT                     12
> +#define IRQ_PMU_OVF                    13
>
>  #define MIP_SSIP                       (_UL(1) << IRQ_S_SOFT)
>  #define MIP_VSSIP                      (_UL(1) << IRQ_VS_SOFT)
> @@ -97,6 +98,7 @@
>  #define MIP_VSEIP                      (_UL(1) << IRQ_VS_EXT)
>  #define MIP_MEIP                       (_UL(1) << IRQ_M_EXT)
>  #define MIP_SGEIP                      (_UL(1) << IRQ_S_GEXT)
> +#define MIP_LCOFIP                     (_UL(1) << IRQ_PMU_OVF)
>
>  #define SIP_SSIP                       MIP_SSIP
>  #define SIP_STIP                       MIP_STIP
> diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
> index 1d73cd73b166..fccd19b7eb31 100644
> --- a/lib/sbi/sbi_hart.c
> +++ b/lib/sbi/sbi_hart.c
> @@ -115,6 +115,9 @@ static int delegate_traps(struct sbi_scratch *scratch)
>
>         /* Send M-mode interrupts and most exceptions to S-mode */
>         interrupts = MIP_SSIP | MIP_STIP | MIP_SEIP;
> +       if (sbi_hart_has_feature(scratch, SBI_HART_HAS_SSCOFPMF))
> +               interrupts |= MIP_LCOFIP;
> +
>         exceptions = (1U << CAUSE_MISALIGNED_FETCH) | (1U << CAUSE_BREAKPOINT) |
>                      (1U << CAUSE_USER_ECALL);
>         if (sbi_platform_has_mfaults_delegation(plat))
> --
> 2.31.1
>
>
> --
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