linux-kernel - Re: [PATCH] perf: arm-spe: Fix check error when synthesizing events

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Date:   Tue, 18 Aug 2020 11:45:06 +0800
From:   "liwei (GF)" <liwei391@...wei.com>
To:     Leo Yan <leo.yan@...aro.org>
CC:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        "Namhyung Kim" <namhyung@...nel.org>,
        James Clark <james.clark@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, <guohanjun@...wei.com>
Subject: Re: [PATCH] perf: arm-spe: Fix check error when synthesizing events

Ping...

On 2020/7/24 16:32, Leo Yan wrote:
> Hi Wei,
> 
> On Fri, Jul 24, 2020 at 03:26:28PM +0800, Wei Li wrote:
>> In arm_spe_read_record(), when we are processing an events packet,
>> 'decoder->packet.index' is the length of payload, which has been
>> transformed in payloadlen(). So correct the check of 'idx'.
>>
>> Signed-off-by: Wei Li <liwei391@...wei.com>
> 
> Good catch.  I checked the ARMv8 ARM and the function payloadlen(),
> can confirm the fixing is correct.
> 
> Reviewed-by: Leo Yan <leo.yan@...aro.org>
> 
>> ---
>>  tools/perf/util/arm-spe-decoder/arm-spe-decoder.c | 6 +++---
>>  1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
>> index 302a14d0aca9..93e063f22be5 100644
>> --- a/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
>> +++ b/tools/perf/util/arm-spe-decoder/arm-spe-decoder.c
>> @@ -182,15 +182,15 @@ static int arm_spe_read_record(struct arm_spe_decoder *decoder)
>>  			if (payload & BIT(EV_TLB_ACCESS))
>>  				decoder->record.type |= ARM_SPE_TLB_ACCESS;
>>  
>> -			if ((idx == 1 || idx == 2 || idx == 3) &&
>> +			if ((idx == 2 || idx == 4 || idx == 8) &&
>>  			    (payload & BIT(EV_LLC_MISS)))
>>  				decoder->record.type |= ARM_SPE_LLC_MISS;
>>  
>> -			if ((idx == 1 || idx == 2 || idx == 3) &&
>> +			if ((idx == 2 || idx == 4 || idx == 8) &&
>>  			    (payload & BIT(EV_LLC_ACCESS)))
>>  				decoder->record.type |= ARM_SPE_LLC_ACCESS;
>>  
>> -			if ((idx == 1 || idx == 2 || idx == 3) &&
>> +			if ((idx == 2 || idx == 4 || idx == 8) &&
>>  			    (payload & BIT(EV_REMOTE_ACCESS)))
>>  				decoder->record.type |= ARM_SPE_REMOTE_ACCESS;
>>  
>> -- 
>> 2.17.1
>>