linux-kernel - Re: [PATCH V5 4/8] perf: Add PERF_BR_NEW_ARCH

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Date:   Tue, 19 Apr 2022 14:57:14 +0100
From:   James Clark <james.clark@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        peterz@...radead.org, acme@...nel.org
Cc:     Robin Murphy <robin.murphy@....com>,
        Suzuki Poulose <suzuki.poulose@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V5 4/8] perf: Add PERF_BR_NEW_ARCH_[N] map for BRBE on
 arm64 platform



On 04/04/2022 05:50, Anshuman Khandual wrote:
> BRBE captured branch types will overflow perf_branch_entry.type and generic
> branch types in perf_branch_entry.new_type. So override each available arch
> specific branch type in the following manner to comprehensively process all
> reported branch types in BRBE.
> 
> PERF_BR_ARM64_FIQ            PERF_BR_NEW_ARCH_1
> PERF_BR_ARM64_DEBUG_HALT     PERF_BR_NEW_ARCH_2
> PERF_BR_ARM64_DEBUG_EXIT     PERF_BR_NEW_ARCH_3
> PERF_BR_ARM64_DEBUG_INST     PERF_BR_NEW_ARCH_4
> PERF_BR_ARM64_DEBUG_DATA     PERF_BR_NEW_ARCH_5
> 
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

Reviewed-by: James Clark <james.clark@....com>

> ---
>  include/uapi/linux/perf_event.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index 193dba2ecdc1..4cf1c8e22cab 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -282,6 +282,12 @@ enum {
>  	PERF_BR_PRIV_HV		= 3,
>  };
>  
> +#define PERF_BR_ARM64_FIQ		PERF_BR_NEW_ARCH_1
> +#define PERF_BR_ARM64_DEBUG_HALT	PERF_BR_NEW_ARCH_2
> +#define PERF_BR_ARM64_DEBUG_EXIT	PERF_BR_NEW_ARCH_3
> +#define PERF_BR_ARM64_DEBUG_INST	PERF_BR_NEW_ARCH_4
> +#define PERF_BR_ARM64_DEBUG_DATA	PERF_BR_NEW_ARCH_5
> +
>  #define PERF_SAMPLE_BRANCH_PLM_ALL \
>  	(PERF_SAMPLE_BRANCH_USER|\
>  	 PERF_SAMPLE_BRANCH_KERNEL|\