linux-kernel - Re: [PATCH v3 19/26] coresight: etm4x: Detect access early on the target CPU

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Message-ID: <61d7e897-3e83-7e95-033c-d43847cfeb09@arm.com>
Date:   Tue, 10 Nov 2020 10:47:54 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, mike.leach@...aro.org,
        coresight@...ts.linaro.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 19/26] coresight: etm4x: Detect access early on the
 target CPU

On 11/6/20 8:46 PM, Mathieu Poirier wrote:
> On Wed, Oct 28, 2020 at 10:09:38PM +0000, Suzuki K Poulose wrote:
>> In preparation to detect the support for system instruction
>> support, move the detection of the device access to the target
>> CPU.
>>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>> ---
>>   .../coresight/coresight-etm4x-core.c          | 45 ++++++++++++++++---
>>   1 file changed, 40 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> index f038bb10bc78..308674ab746c 100644
>> --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
>> @@ -56,6 +56,11 @@ static u64 etm4_get_access_type(struct etmv4_config *config);
>>   
>>   static enum cpuhp_state hp_online;
>>   
>> +struct etm_init_arg {
>> +	struct etmv4_drvdata	*drvdata;
>> +	struct csdev_access	*csa;
>> +};
>> +
>>   u64 etm4x_sysreg_read(struct csdev_access *csa,
>>   		      u32 offset,
>>   		      bool _relaxed,
>> @@ -669,6 +674,22 @@ static const struct coresight_ops etm4_cs_ops = {
>>   	.source_ops	= &etm4_source_ops,
>>   };
>>   
>> +static bool etm_init_iomem_access(struct etmv4_drvdata *drvdata,
>> +				  struct csdev_access *csa)
>> +{
>> +	*csa = CSDEV_ACCESS_IOMEM(drvdata->base);
>> +	return true;
>> +}
>> +
>> +static bool etm_init_csdev_access(struct etmv4_drvdata *drvdata,
>> +				  struct csdev_access *csa)
>> +{
>> +	if (drvdata->base)
>> +		return etm_init_iomem_access(drvdata, csa);
>> +
>> +	return false;
>> +}
> 
> I would also prefix the above two functions with "etm4_" rather than "etm_" to
> follow what is already done in this file.

sure, will do.

suzuki