linux-kernel - Re: [PATCH V2 1/3] perf/powerpc:add ability to sample intr machine state in power

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Date:	Wed, 28 Oct 2015 15:50:34 +0530
From:	Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
To:	Anju T <anju@...ux.vnet.ibm.com>, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Cc:	acme@...hat.com, hemant@...ux.vnet.ibm.com, dsahern@...il.com,
	naveen.n.rao@...ux.vnet.ibm.com, sukadev@...ux.vnet.ibm.com,
	jolsa@...hat.com, khandual@...ux.vnet.ibm.com
Subject: Re: [PATCH V2 1/3] perf/powerpc:add ability to sample intr machine
 state in power



On Monday 26 October 2015 06:14 PM, Anju T wrote:
> The enum definition assigns an 'id' to each register in "struct pt_regs" 
> of arch/powerpc.The order of these values in the enum definition are 
> based on the corresponding macros in 
> arch/powerpc/include/uapi/asm/ptrace.h .
>
> Signed-off-by: Anju T <anju@...ux.vnet.ibm.com>
> ---
>  arch/powerpc/include/uapi/asm/perf_regs.h | 55 +++++++++++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 arch/powerpc/include/uapi/asm/perf_regs.h
>
> diff --git a/arch/powerpc/include/uapi/asm/perf_regs.h b/arch/powerpc/include/uapi/asm/perf_regs.h
> new file mode 100644
> index 0000000..b97727c
> --- /dev/null
> +++ b/arch/powerpc/include/uapi/asm/perf_regs.h
> @@ -0,0 +1,55 @@
> +#ifndef _ASM_POWERPC_PERF_REGS_H
> +#define _ASM_POWERPC_PERF_REGS_H
> +
> +enum perf_event_powerpc_regs {
> +	PERF_REG_POWERPC_GPR0,
> +	PERF_REG_POWERPC_GPR1,
> +	PERF_REG_POWERPC_GPR2,
> +	PERF_REG_POWERPC_GPR3,
> +	PERF_REG_POWERPC_GPR4,
> +	PERF_REG_POWERPC_GPR5,
> +	PERF_REG_POWERPC_GPR6,
> +	PERF_REG_POWERPC_GPR7,
> +	PERF_REG_POWERPC_GPR8,
> +	PERF_REG_POWERPC_GPR9,
> +	PERF_REG_POWERPC_GPR10,
> +	PERF_REG_POWERPC_GPR11,
> +	PERF_REG_POWERPC_GPR12,
> +	PERF_REG_POWERPC_GPR13,
> +	PERF_REG_POWERPC_GPR14,
> +	PERF_REG_POWERPC_GPR15,
> +	PERF_REG_POWERPC_GPR16,
> +	PERF_REG_POWERPC_GPR17,
> +	PERF_REG_POWERPC_GPR18,
> +	PERF_REG_POWERPC_GPR19,
> +	PERF_REG_POWERPC_GPR20,
> +	PERF_REG_POWERPC_GPR21,
> +	PERF_REG_POWERPC_GPR22,
> +	PERF_REG_POWERPC_GPR23,
> +	PERF_REG_POWERPC_GPR24,
> +	PERF_REG_POWERPC_GPR25,
> +	PERF_REG_POWERPC_GPR26,
> +	PERF_REG_POWERPC_GPR27,
> +	PERF_REG_POWERPC_GPR28,
> +	PERF_REG_POWERPC_GPR29,
> +	PERF_REG_POWERPC_GPR30,
> +	PERF_REG_POWERPC_GPR31,
> +	PERF_REG_POWERPC_NIP,
> +	PERF_REG_POWERPC_MSR,
> +	PERF_REG_POWERPC_ORIG_R3,
> +	PERF_REG_POWERPC_CTR,
> +	PERF_REG_POWERPC_LNK,
> +	PERF_REG_POWERPC_XER,
> +	PERF_REG_POWERPC_CCR,
> +#ifdef __powerpc64__
> +	PERF_REG_POWERPC_SOFTE,
> +#else
> +	PERF_REG_POWERPC_MQ,
> +#endif
> +	PERF_REG_POWERPC_TRAP,
> +	PERF_REG_POWERPC_DAR,
> +	PERF_REG_POWERPC_DSISR,
> +	PERF_REG_POWERPC_RESULT,

IIUC, We dont need "result". "PERF_REG_POWERPC_RESULT" will
always be zero, because of regs_get_register (asm/ptrace.h),
that you call in patch 3 of this patchset, will check for MAX_REG_OFFSET
and return 0 for "result".

Maddy

> +	PERF_REG_POWERPC_MAX,
> +};
> +#endif /* _ASM_POWERPC_PERF_REGS_H */

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