linux-kernel - Re: [PATCH v2 3/6] perf cs-etm: Update deduction of TRCCONFIGR register for branch broadcast

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Message-ID: <25b85560-dd95-2569-d1bc-872902d6343f@arm.com>
Date:   Fri, 28 Jan 2022 11:25:24 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     James Clark <james.clark@....com>, mathieu.poirier@...aro.org,
        coresight@...ts.linaro.org, leo.yan@...aro.com,
        mike.leach@...aro.org
Cc:     Leo Yan <leo.yan@...aro.org>, John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 3/6] perf cs-etm: Update deduction of TRCCONFIGR
 register for branch broadcast

On 13/01/2022 09:10, James Clark wrote:
> Now that a config flag for branch broadcast has been added, take it into
> account when trying to deduce what the driver would have programmed the
> TRCCONFIGR register to.
> 
> Reviewed-by: Leo Yan <leo.yan@...aro.org>
> Signed-off-by: James Clark <james.clark@....com>
> ---
>   tools/include/linux/coresight-pmu.h | 2 ++
>   tools/perf/arch/arm/util/cs-etm.c   | 3 +++
>   2 files changed, 5 insertions(+)
> 
> diff --git a/tools/include/linux/coresight-pmu.h b/tools/include/linux/coresight-pmu.h
> index 4ac5c081af93..6c2fd6cc5a98 100644
> --- a/tools/include/linux/coresight-pmu.h
> +++ b/tools/include/linux/coresight-pmu.h
> @@ -18,6 +18,7 @@
>    * ETMv3.5/PTM doesn't define ETMCR config bits with prefix "ETM3_" and
>    * directly use below macros as config bits.
>    */
> +#define ETM_OPT_BRANCH_BROADCAST 8
>   #define ETM_OPT_CYCACC		12
>   #define ETM_OPT_CTXTID		14
>   #define ETM_OPT_CTXTID2		15
> @@ -25,6 +26,7 @@
>   #define ETM_OPT_RETSTK		29
>   
>   /* ETMv4 CONFIGR programming bits for the ETM OPTs */
> +#define ETM4_CFG_BIT_BB         3
>   #define ETM4_CFG_BIT_CYCACC	4
>   #define ETM4_CFG_BIT_CTXTID	6
>   #define ETM4_CFG_BIT_VMID	7
> diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
> index 293a23bf8be3..c7ef4e9b4a3a 100644
> --- a/tools/perf/arch/arm/util/cs-etm.c
> +++ b/tools/perf/arch/arm/util/cs-etm.c
> @@ -527,6 +527,9 @@ static u64 cs_etmv4_get_config(struct auxtrace_record *itr)
>   	if (config_opts & BIT(ETM_OPT_CTXTID2))
>   		config |= BIT(ETM4_CFG_BIT_VMID) |
>   			  BIT(ETM4_CFG_BIT_VMID_OPT);
> +	if (config_opts & BIT(ETM_OPT_BRANCH_BROADCAST))
> +		config |= BIT(ETM4_CFG_BIT_BB);
> +
>   	return config;

Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>

>   }
>