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Subject: Re: [PATCH v4 3/5] drivers: devfreq: events: extend events by type
 of counted data
To:     Lukasz Luba <l.luba@partner.samsung.com>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, linux-samsung-soc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
Cc:     b.zolnierkie@samsung.com, krzk@kernel.org, robh+dt@kernel.org,
        mark.rutland@arm.com, kyungmin.park@samsung.com,
        m.szyprowski@samsung.com, s.nawrocki@samsung.com,
        myungjoo.ham@samsung.com, kgene@kernel.org,
        willy.mh.wolff.ml@gmail.com
From:   Chanwoo Choi <cw00.choi@samsung.com>
Organization: Samsung Electronics
Message-ID: <15375017-2e82-7df8-344c-a9c41d61331c@samsung.com>
Date:   Wed, 24 Jul 2019 19:24:53 +0900
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References: <20190605091236.24263-1-l.luba@partner.samsung.com>
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        <20190605091236.24263-4-l.luba@partner.samsung.com>
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Hi Lukasz,

On 19. 7. 24. 오후 7:15, Lukasz Luba wrote:
> Hi Chanwoo,
> 
> Could you have a look a this patch, please?
> This patch has been rewritten accorifing to your suggestion.
> Krzysztof tried to apply 5/5 DT patch on his current branch,
> but it is missing earlier stuff.
> The other patches have needed ACKs so could go through devfreq tree
> probably, but this one left.

Sorry for the late reply. It looks good to me.

Acked-by: Chanwoo Choi <cw00.choi@samsung.com>

> 
> Regards,
> Lukasz
> 
> On 6/5/19 11:12 AM, Lukasz Luba wrote:
>> This patch adds posibility to choose what type of data should be counted
>> by the PPMU counter. Now the type comes from DT where the event has been
>> defined. When there is no 'event-data-type' the default value is used,
>> which is 'read+write data in bytes'.
>> It is needed when you want to know not only read+write data bytes but
>> i.e. only write data in byte, or number of read requests, etc.
>>
>> Signed-off-by: Lukasz Luba <l.luba@partner.samsung.com>
>> ---
>>   drivers/devfreq/event/exynos-ppmu.c | 60 ++++++++++++++++++++---------
>>   include/linux/devfreq-event.h       |  6 +++
>>   2 files changed, 47 insertions(+), 19 deletions(-)
>>
>> diff --git a/drivers/devfreq/event/exynos-ppmu.c b/drivers/devfreq/event/exynos-ppmu.c
>> index 17f3c86a6f00..12f637320e9e 100644
>> --- a/drivers/devfreq/event/exynos-ppmu.c
>> +++ b/drivers/devfreq/event/exynos-ppmu.c
>> @@ -161,9 +161,9 @@ static int exynos_ppmu_set_event(struct devfreq_event_dev *edev)
>>   	if (ret < 0)
>>   		return ret;
>>   
>> -	/* Set the event of Read/Write data count  */
>> +	/* Set the event of proper data type monitoring */
>>   	ret = regmap_write(info->regmap, PPMU_BEVTxSEL(id),
>> -				PPMU_RO_DATA_CNT | PPMU_WO_DATA_CNT);
>> +			   edev->desc->data_type);
>>   	if (ret < 0)
>>   		return ret;
>>   
>> @@ -375,23 +375,11 @@ static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
>>   	if (ret < 0)
>>   		return ret;
>>   
>> -	/* Set the event of Read/Write data count  */
>> -	switch (id) {
>> -	case PPMU_PMNCNT0:
>> -	case PPMU_PMNCNT1:
>> -	case PPMU_PMNCNT2:
>> -		ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
>> -				PPMU_V2_RO_DATA_CNT | PPMU_V2_WO_DATA_CNT);
>> -		if (ret < 0)
>> -			return ret;
>> -		break;
>> -	case PPMU_PMNCNT3:
>> -		ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
>> -				PPMU_V2_EVT3_RW_DATA_CNT);
>> -		if (ret < 0)
>> -			return ret;
>> -		break;
>> -	}
>> +	/* Set the event of proper data type monitoring */
>> +	ret = regmap_write(info->regmap, PPMU_V2_CH_EVx_TYPE(id),
>> +			   edev->desc->data_type);
>> +	if (ret < 0)
>> +		return ret;
>>   
>>   	/* Reset cycle counter/performance counter and enable PPMU */
>>   	ret = regmap_read(info->regmap, PPMU_V2_PMNC, &pmnc);
>> @@ -507,6 +495,7 @@ static int of_get_devfreq_events(struct device_node *np,
>>   	struct device_node *events_np, *node;
>>   	int i, j, count;
>>   	const struct of_device_id *of_id;
>> +	int ret;
>>   
>>   	events_np = of_get_child_by_name(np, "events");
>>   	if (!events_np) {
>> @@ -556,6 +545,39 @@ static int of_get_devfreq_events(struct device_node *np,
>>   		desc[j].driver_data = info;
>>   
>>   		of_property_read_string(node, "event-name", &desc[j].name);
>> +		ret = of_property_read_u32(node, "event-data-type",
>> +					   &desc[j].data_type);
>> +		if (ret) {
>> +			/* Set the event of proper data type counting.
>> +			 * Check if the data type has been defined in DT,
>> +			 * use default if not.
>> +			 */
>> +			if (info->ppmu_type == EXYNOS_TYPE_PPMU_V2) {
>> +				struct devfreq_event_dev edev;
>> +				int id;
>> +				/* Not all registers take the same value for
>> +				 * read+write data count.
>> +				 */
>> +				edev.desc = &desc[j];
>> +				id = exynos_ppmu_find_ppmu_id(&edev);
>> +
>> +				switch (id) {
>> +				case PPMU_PMNCNT0:
>> +				case PPMU_PMNCNT1:
>> +				case PPMU_PMNCNT2:
>> +					desc[j].data_type = PPMU_V2_RO_DATA_CNT
>> +						| PPMU_V2_WO_DATA_CNT;
>> +					break;
>> +				case PPMU_PMNCNT3:
>> +					desc[j].data_type =
>> +						PPMU_V2_EVT3_RW_DATA_CNT;
>> +					break;
>> +				}
>> +			} else {
>> +				desc[j].data_type = PPMU_RO_DATA_CNT |
>> +					PPMU_WO_DATA_CNT;
>> +			}
>> +		}
>>   
>>   		j++;
>>   	}
>> diff --git a/include/linux/devfreq-event.h b/include/linux/devfreq-event.h
>> index 4db00b02ca3f..cc160b1274c0 100644
>> --- a/include/linux/devfreq-event.h
>> +++ b/include/linux/devfreq-event.h
>> @@ -81,14 +81,20 @@ struct devfreq_event_ops {
>>    * struct devfreq_event_desc - the descriptor of devfreq-event device
>>    *
>>    * @name	: the name of devfreq-event device.
>> + * @data_type	: the data type which is going to be counted in the register.
>>    * @driver_data	: the private data for devfreq-event driver.
>>    * @ops		: the operation to control devfreq-event device.
>>    *
>>    * Each devfreq-event device is described with a this structure.
>>    * This structure contains the various data for devfreq-event device.
>> + * The data_type describes what is going to be counted in the register.
>> + * It might choose to count e.g. read requests, write data in bytes, etc.
>> + * The full supported list of types is present in specyfic header in:
>> + * include/dt-bindings/pmu/.
>>    */
>>   struct devfreq_event_desc {
>>   	const char *name;
>> +	u32 data_type;
>>   	void *driver_data;
>>   
>>   	const struct devfreq_event_ops *ops;
>>
> 
> 


-- 
Best Regards,
Chanwoo Choi
Samsung Electronics