Subject: Re: [PATCH v2 04/10] powerpc/perf: Add power10_feat to dt_cpu_ftrs

From: Michael Ellerman <[email-masked]>
Date: Wed, 08 Jul 2020 21:15:16 +1000

Athira Rajeev <[email-masked]> writes:
> From: Madhavan Srinivasan <[email-masked]>
>
> Add power10 feature function to dt_cpu_ftrs.c along
> with a power10 specific init() to initialize pmu sprs.
>
> Signed-off-by: Madhavan Srinivasan <[email-masked]>
> ---
>  arch/powerpc/include/asm/reg.h        |  3 +++
>  arch/powerpc/kernel/cpu_setup_power.S |  7 +++++++
>  arch/powerpc/kernel/dt_cpu_ftrs.c     | 26 ++++++++++++++++++++++++++
>  3 files changed, 36 insertions(+)
>
> diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
> index 21a1b2d..900ada1 100644
> --- a/arch/powerpc/include/asm/reg.h
> +++ b/arch/powerpc/include/asm/reg.h
> @@ -1068,6 +1068,9 @@
>  #define MMCR0_PMC2_LOADMISSTIME	0x5
>  #endif
>  
> +/* BHRB disable bit for PowerISA v3.10 */
> +#define MMCRA_BHRB_DISABLE	0x0000002000000000
> +
>  /*
>   * SPRG usage:
>   *
> diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S
> index efdcfa7..e8b3370c 100644
> --- a/arch/powerpc/kernel/cpu_setup_power.S
> +++ b/arch/powerpc/kernel/cpu_setup_power.S
> @@ -233,3 +233,10 @@ __init_PMU_ISA207:
>  	li	r5,0
>  	mtspr	SPRN_MMCRS,r5
>  	blr
> +
> +__init_PMU_ISA31:
> +	li	r5,0
> +	mtspr	SPRN_MMCR3,r5
> +	LOAD_REG_IMMEDIATE(r5, MMCRA_BHRB_DISABLE)
> +	mtspr	SPRN_MMCRA,r5
> +	blr

This doesn't seem like it belongs in this patch. It's not called?

cheers