Subject: Re: [v3 15/15] tools/perf: Add perf tools support for extended regs in power10

From: kajoljain <[email-masked]>
Date: Tue, 21 Jul 2020 11:34:37 +0530

On 7/17/20 8:08 PM, Athira Rajeev wrote:
> Added support for supported regs which are new in power10
> ( MMCR3, SIER2, SIER3 ) to sample_reg_mask in the tool side
> to use with `-I?` option. Also added PVR check to send extended
> mask for power10 at kernel while capturing extended regs in
> each sample.
> 
> Signed-off-by: Athira Rajeev <[email-masked]>
> ---
>  tools/arch/powerpc/include/uapi/asm/perf_regs.h | 6 ++++++
>  tools/perf/arch/powerpc/include/perf_regs.h     | 3 +++
>  tools/perf/arch/powerpc/util/perf_regs.c        | 6 ++++++
>  3 files changed, 15 insertions(+)
> 

Reviewed-by: Kajol Jain <[email-masked]>

Thanks,
Kajol Jain

> diff --git a/tools/arch/powerpc/include/uapi/asm/perf_regs.h b/tools/arch/powerpc/include/uapi/asm/perf_regs.h
> index 225c64c..bdf5f10 100644
> --- a/tools/arch/powerpc/include/uapi/asm/perf_regs.h
> +++ b/tools/arch/powerpc/include/uapi/asm/perf_regs.h
> @@ -52,6 +52,9 @@ enum perf_event_powerpc_regs {
>  	PERF_REG_POWERPC_MMCR0,
>  	PERF_REG_POWERPC_MMCR1,
>  	PERF_REG_POWERPC_MMCR2,
> +	PERF_REG_POWERPC_MMCR3,
> +	PERF_REG_POWERPC_SIER2,
> +	PERF_REG_POWERPC_SIER3,
>  	/* Max regs without the extended regs */
>  	PERF_REG_POWERPC_MAX = PERF_REG_POWERPC_MMCRA + 1,
>  };
> @@ -60,6 +63,9 @@ enum perf_event_powerpc_regs {
>  
>  /* 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)
>  
>  #define PERF_REG_MAX_ISA_300   (PERF_REG_POWERPC_MMCR2 + 1)
> +#define PERF_REG_MAX_ISA_31    (PERF_REG_POWERPC_SIER3 + 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 46ed00d..63f3ac9 100644
> --- a/tools/perf/arch/powerpc/include/perf_regs.h
> +++ b/tools/perf/arch/powerpc/include/perf_regs.h
> @@ -68,6 +68,9 @@
>  	[PERF_REG_POWERPC_MMCR0] = "mmcr0",
>  	[PERF_REG_POWERPC_MMCR1] = "mmcr1",
>  	[PERF_REG_POWERPC_MMCR2] = "mmcr2",
> +	[PERF_REG_POWERPC_MMCR3] = "mmcr3",
> +	[PERF_REG_POWERPC_SIER2] = "sier2",
> +	[PERF_REG_POWERPC_SIER3] = "sier3",
>  };
>  
>  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 d64ba0c..2b6d470 100644
> --- a/tools/perf/arch/powerpc/util/perf_regs.c
> +++ b/tools/perf/arch/powerpc/util/perf_regs.c
> @@ -14,6 +14,7 @@
>  #include <linux/kernel.h>
>  
>  #define PVR_POWER9		0x004E
> +#define PVR_POWER10		0x0080
>  
>  const struct sample_reg sample_reg_masks[] = {
>  	SMPL_REG(r0, PERF_REG_POWERPC_R0),
> @@ -64,6 +65,9 @@
>  	SMPL_REG(mmcr0, PERF_REG_POWERPC_MMCR0),
>  	SMPL_REG(mmcr1, PERF_REG_POWERPC_MMCR1),
>  	SMPL_REG(mmcr2, PERF_REG_POWERPC_MMCR2),
> +	SMPL_REG(mmcr3, PERF_REG_POWERPC_MMCR3),
> +	SMPL_REG(sier2, PERF_REG_POWERPC_SIER2),
> +	SMPL_REG(sier3, PERF_REG_POWERPC_SIER3),
>  	SMPL_REG_END
>  };
>  
> @@ -194,6 +198,8 @@ uint64_t arch__intr_reg_mask(void)
>  	version = (((mfspr(SPRN_PVR)) >>  16) & 0xFFFF);
>  	if (version == PVR_POWER9)
>  		extended_mask = PERF_REG_PMU_MASK_300;
> +	else if (version == PVR_POWER10)
> +		extended_mask = PERF_REG_PMU_MASK_31;
>  	else
>  		return mask;
>  
>