[PATCH 3/3] lib: sbi: pmu: Set a SSE register_cb() for event availability

[Samuel Holland]

On 2024-12-06 2:59 PM, Clément Léger wrote:
> Since the SSE event can work only when the LCOFIP interrupt is available,
> check for the Sscofpmf extension to be available in the SSE register
> callback.

Is this a hard limitation, or could the driver be made to work whenever
sbi_pmu_irq_bit() returns a valid bit?

Since this accurately reflects the current implementation:

Reviewed-by: Samuel Holland <samuel.holland at sifive.com>

> Signed-off-by: Clément Léger <cleger at rivosinc.com>
> ---
>  lib/sbi/sbi_pmu.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/lib/sbi/sbi_pmu.c b/lib/sbi/sbi_pmu.c
> index 0696ab5e..0851abad 100644
> --- a/lib/sbi/sbi_pmu.c
> +++ b/lib/sbi/sbi_pmu.c
> @@ -1110,7 +1110,18 @@ static void pmu_sse_complete(uint32_t event_id)
>  	csr_set(CSR_MIE, MIP_LCOFIP);
>  }
>  
> +static int pmu_sse_register(uint32_t event_id)
> +{
> +	struct sbi_scratch *scratch = sbi_scratch_thishart_ptr();
> +
> +	if (!sbi_hart_has_extension(scratch, SBI_HART_EXT_SSCOFPMF))
> +		return SBI_ERR_FAILED;
> +
> +	return SBI_SUCCESS;
> +}
> +
>  static const struct sbi_sse_cb_ops pmu_sse_cb_ops = {
> +	.register_cb = pmu_sse_register,
>  	.enable_cb = pmu_sse_enable,
>  	.disable_cb = pmu_sse_disable,
>  	.complete_cb = pmu_sse_complete,