linux-kernel - Re: [PATCH] coresight: etm4x: Fix accesses to TRCSEQRSTEVR and TRCSEQSTR

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Message-ID: <5a834f93-f32b-c926-2bec-e00e35aa864f@huawei.com>
Date:   Sat, 14 Jan 2023 16:49:29 +0800
From:   hejunhao <hejunhao3@...wei.com>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        <mathieu.poirier@...aro.org>, <suzuki.poulose@....com>,
        <mike.leach@...aro.org>, <leo.yan@...aro.org>
CC:     <coresight@...ts.linaro.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linuxarm@...wei.com>,
        <shenyang39@...wei.com>, <prime.zeng@...ilicon.com>
Subject: Re: [PATCH] coresight: etm4x: Fix accesses to TRCSEQRSTEVR and
 TRCSEQSTR


On 2023/1/12 11:48, Anshuman Khandual wrote:
>
> On 1/10/23 18:21, Junhao He wrote:
>> The TRCSEQRSTEVR and TRCSEQSTR register is not implemented if the
> s/register is/registers are/
Ok, will fix it.
Thanks.
>> TRCIDR5.NUMSEQSTATE == 0. Skip accessing the register in such cases.
> s/register/registers/
Ok, will fix it.
Thanks.

>> Signed-off-by: Junhao He <hejunhao3@...wei.com>
> Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>
>
>> ---
>>   .../hwtracing/coresight/coresight-etm4x-core.c | 18 ++++++++++++------
>>   1 file changed, 12 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> index 80fefaba58ee..c7a65d1524fc 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> @@ -424,8 +424,10 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
>>   		etm4x_relaxed_write32(csa, config->vipcssctlr, TRCVIPCSSCTLR);
>>   	for (i = 0; i < drvdata->nrseqstate - 1; i++)
>>   		etm4x_relaxed_write32(csa, config->seq_ctrl[i], TRCSEQEVRn(i));
>> -	etm4x_relaxed_write32(csa, config->seq_rst, TRCSEQRSTEVR);
>> -	etm4x_relaxed_write32(csa, config->seq_state, TRCSEQSTR);
>> +	if (drvdata->nrseqstate) {
>> +		etm4x_relaxed_write32(csa, config->seq_rst, TRCSEQRSTEVR);
>> +		etm4x_relaxed_write32(csa, config->seq_state, TRCSEQSTR);
>> +	}
>>   	etm4x_relaxed_write32(csa, config->ext_inp, TRCEXTINSELR);
>>   	for (i = 0; i < drvdata->nr_cntr; i++) {
>>   		etm4x_relaxed_write32(csa, config->cntrldvr[i], TRCCNTRLDVRn(i));
>> @@ -1631,8 +1633,10 @@ static int __etm4_cpu_save(struct etmv4_drvdata *drvdata)
>>   	for (i = 0; i < drvdata->nrseqstate - 1; i++)
>>   		state->trcseqevr[i] = etm4x_read32(csa, TRCSEQEVRn(i));
>>   
>> -	state->trcseqrstevr = etm4x_read32(csa, TRCSEQRSTEVR);
>> -	state->trcseqstr = etm4x_read32(csa, TRCSEQSTR);
>> +	if (drvdata->nrseqstate) {
>> +		state->trcseqrstevr = etm4x_read32(csa, TRCSEQRSTEVR);
>> +		state->trcseqstr = etm4x_read32(csa, TRCSEQSTR);
>> +	}
>>   	state->trcextinselr = etm4x_read32(csa, TRCEXTINSELR);
>>   
>>   	for (i = 0; i < drvdata->nr_cntr; i++) {
>> @@ -1760,8 +1764,10 @@ static void __etm4_cpu_restore(struct etmv4_drvdata *drvdata)
>>   	for (i = 0; i < drvdata->nrseqstate - 1; i++)
>>   		etm4x_relaxed_write32(csa, state->trcseqevr[i], TRCSEQEVRn(i));
>>   
>> -	etm4x_relaxed_write32(csa, state->trcseqrstevr, TRCSEQRSTEVR);
>> -	etm4x_relaxed_write32(csa, state->trcseqstr, TRCSEQSTR);
>> +	if (drvdata->nrseqstate) {
>> +		etm4x_relaxed_write32(csa, state->trcseqrstevr, TRCSEQRSTEVR);
>> +		etm4x_relaxed_write32(csa, state->trcseqstr, TRCSEQSTR);
>> +	}
>>   	etm4x_relaxed_write32(csa, state->trcextinselr, TRCEXTINSELR);
>>   
>>   	for (i = 0; i < drvdata->nr_cntr; i++) {
> .
>