Subject: Re: [PATCH 3/3] tools/perf: Add perf tools support to expose Performance Monitor Counter SPRs as part of extended regs

From: Arnaldo Carvalho de Melo <[email-masked]>
Date: Wed, 3 Feb 2021 13:25:20 -0300

Em Wed, Feb 03, 2021 at 01:55:37AM -0500, Athira Rajeev escreveu:
> To enable presenting of Performance Monitor Counter Registers
> (PMC1 to PMC6) as part of extended regsiters, patch adds these
> to sample_reg_mask in the tool side (to use with -I? option).
> 
> Simplified the PERF_REG_PMU_MASK_300/31 definition. Excluded the
> unsupported SPRs (MMCR3, SIER2, SIER3) from extended mask value for
> CPU_FTR_ARCH_300.

Applied just 3/3, the tooling part, to my local branch, please holler if
I should wait a bit more.

- Arnaldo
 
> Signed-off-by: Athira Rajeev <[email-masked]>
> ---
>  tools/arch/powerpc/include/uapi/asm/perf_regs.h | 28 +++++++++++++++++++------
>  tools/perf/arch/powerpc/include/perf_regs.h     |  6 ++++++
>  tools/perf/arch/powerpc/util/perf_regs.c        |  6 ++++++
>  3 files changed, 34 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/arch/powerpc/include/uapi/asm/perf_regs.h b/tools/arch/powerpc/include/uapi/asm/perf_regs.h
> index bdf5f10f8b9f..578b3ee86105 100644
> --- a/tools/arch/powerpc/include/uapi/asm/perf_regs.h
> +++ b/tools/arch/powerpc/include/uapi/asm/perf_regs.h
> @@ -55,17 +55,33 @@ enum perf_event_powerpc_regs {
>  	PERF_REG_POWERPC_MMCR3,
>  	PERF_REG_POWERPC_SIER2,
>  	PERF_REG_POWERPC_SIER3,
> +	PERF_REG_POWERPC_PMC1,
> +	PERF_REG_POWERPC_PMC2,
> +	PERF_REG_POWERPC_PMC3,
> +	PERF_REG_POWERPC_PMC4,
> +	PERF_REG_POWERPC_PMC5,
> +	PERF_REG_POWERPC_PMC6,
>  	/* Max regs without the extended regs */
>  	PERF_REG_POWERPC_MAX = PERF_REG_POWERPC_MMCRA + 1,
>  };
>  
>  #define PERF_REG_PMU_MASK	((1ULL << PERF_REG_POWERPC_MAX) - 1)
>  
> -/* PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_300 */
> -#define PERF_REG_PMU_MASK_300   (((1ULL << (PERF_REG_POWERPC_MMCR2 + 1)) - 1) - PERF_REG_PMU_MASK)
> -/* PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_31 */
> -#define PERF_REG_PMU_MASK_31   (((1ULL << (PERF_REG_POWERPC_SIER3 + 1)) - 1) - PERF_REG_PMU_MASK)
> +/* Exclude MMCR3, SIER2, SIER3 for CPU_FTR_ARCH_300 */
> +#define	PERF_EXCLUDE_REG_EXT_300	(7ULL << PERF_REG_POWERPC_MMCR3)
>  
> -#define PERF_REG_MAX_ISA_300   (PERF_REG_POWERPC_MMCR2 + 1)
> -#define PERF_REG_MAX_ISA_31    (PERF_REG_POWERPC_SIER3 + 1)
> +/*
> + * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_300
> + * includes 9 SPRS from MMCR0 to PMC6 excluding the
> + * unsupported SPRS in PERF_EXCLUDE_REG_EXT_300.
> + */
> +#define PERF_REG_PMU_MASK_300   ((0xfffULL << PERF_REG_POWERPC_MMCR0) - PERF_EXCLUDE_REG_EXT_300)
> +
> +/*
> + * PERF_REG_EXTENDED_MASK value for CPU_FTR_ARCH_31
> + * includes 12 SPRs from MMCR0 to PMC6.
> + */
> +#define PERF_REG_PMU_MASK_31   (0xfffULL << PERF_REG_POWERPC_MMCR0)
> +
> +#define PERF_REG_EXTENDED_MAX  (PERF_REG_POWERPC_PMC6 + 1)
>  #endif /* _UAPI_ASM_POWERPC_PERF_REGS_H */
> diff --git a/tools/perf/arch/powerpc/include/perf_regs.h b/tools/perf/arch/powerpc/include/perf_regs.h
> index 63f3ac91049f..98b6f9eabfc3 100644
> --- a/tools/perf/arch/powerpc/include/perf_regs.h
> +++ b/tools/perf/arch/powerpc/include/perf_regs.h
> @@ -71,6 +71,12 @@
>  	[PERF_REG_POWERPC_MMCR3] = "mmcr3",
>  	[PERF_REG_POWERPC_SIER2] = "sier2",
>  	[PERF_REG_POWERPC_SIER3] = "sier3",
> +	[PERF_REG_POWERPC_PMC1] = "pmc1",
> +	[PERF_REG_POWERPC_PMC2] = "pmc2",
> +	[PERF_REG_POWERPC_PMC3] = "pmc3",
> +	[PERF_REG_POWERPC_PMC4] = "pmc4",
> +	[PERF_REG_POWERPC_PMC5] = "pmc5",
> +	[PERF_REG_POWERPC_PMC6] = "pmc6",
>  };
>  
>  static inline const char *perf_reg_name(int id)
> diff --git a/tools/perf/arch/powerpc/util/perf_regs.c b/tools/perf/arch/powerpc/util/perf_regs.c
> index 2b6d4704e3aa..8116a253f91f 100644
> --- a/tools/perf/arch/powerpc/util/perf_regs.c
> +++ b/tools/perf/arch/powerpc/util/perf_regs.c
> @@ -68,6 +68,12 @@
>  	SMPL_REG(mmcr3, PERF_REG_POWERPC_MMCR3),
>  	SMPL_REG(sier2, PERF_REG_POWERPC_SIER2),
>  	SMPL_REG(sier3, PERF_REG_POWERPC_SIER3),
> +	SMPL_REG(pmc1, PERF_REG_POWERPC_PMC1),
> +	SMPL_REG(pmc2, PERF_REG_POWERPC_PMC2),
> +	SMPL_REG(pmc3, PERF_REG_POWERPC_PMC3),
> +	SMPL_REG(pmc4, PERF_REG_POWERPC_PMC4),
> +	SMPL_REG(pmc5, PERF_REG_POWERPC_PMC5),
> +	SMPL_REG(pmc6, PERF_REG_POWERPC_PMC6),
>  	SMPL_REG_END
>  };
>  
> -- 
> 1.8.3.1
> 

-- 

- Arnaldo