[PATCH V2 drivers/perf: hisi:] drivers/perf: hisi: fix set wrong filter mode for running events issue

[PATCH V2 drivers/perf: hisi:] drivers/perf: hisi: fix set wrong filter mode for running events issue

[Jijie Shao]

From: Hao Chen <chenhao418@huawei.com>

hns3_pmu_select_filter_mode() includes A series of mode judgments such
as global mode ,function mode, function-queue mode, port mode, port-tc
mode.

For a special scenario:
command use parameter
perf stat -a -e hns3_pmu_sicl_0/bdf=0x3700,config=0x3,queue=0x0,
and hns3_pmu_is_enabled_func_mode() has a judgement as below:
if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC))

filter_support of event 0x3 hasn't set bit for func mode, so it can't
enter func-mode branch, and continue to func-queue mode judgement, port
judgement, port-tc mode, then enter port-tc mode.

It's not up to expectations, it shouldn't enter any modes but
return -ENOENT.

port-tc mode parameter show as below:
perf stat -a -e hns3_pmu_sicl_0/config=0x00001,port=0x0,tc=0x1

port-tc mode should use bdf parameter as 0, so, add judgement of
bdf parameter to fix it.

Signed-off-by: Hao Chen <chenhao418@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
---
changeLog:
  v2: add more details in log message suggested by Will
  v1 link: https://lore.kernel.org/all/20230816094619.3563784-1-shaojijie@huawei.com/
---
 drivers/perf/hisilicon/hns3_pmu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/perf/hisilicon/hns3_pmu.c b/drivers/perf/hisilicon/hns3_pmu.c
index e0457d84af6b..2aa9cb045705 100644
--- a/drivers/perf/hisilicon/hns3_pmu.c
+++ b/drivers/perf/hisilicon/hns3_pmu.c
@@ -998,12 +998,13 @@ static bool
 hns3_pmu_is_enabled_port_tc_mode(struct perf_event *event,
 				 struct hns3_pmu_event_attr *pmu_event)
 {
+	u16 bdf = hns3_pmu_get_bdf(event);
 	u8 tc_id = hns3_pmu_get_tc(event);
 
 	if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_PORT_TC))
 		return false;
 
-	return tc_id != HNS3_PMU_FILTER_ALL_TC;
+	return (tc_id != HNS3_PMU_FILTER_ALL_TC) && (!bdf);
 }
 
 static bool
-- 
2.30.0


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Re: [PATCH V2 drivers/perf: hisi:] drivers/perf: hisi: fix set wrong filter mode for running events issue

[Jonathan Cameron]

On Fri, 1 Sep 2023 11:50:27 +0800
Jijie Shao <shaojijie@huawei.com> wrote:

> From: Hao Chen <chenhao418@huawei.com>

Mention which hisi pmu this is in the patch description (hns)

> 
> hns3_pmu_select_filter_mode() includes A series of mode judgments such

includes a series

> as global mode ,function mode, function-queue mode, port mode, port-tc
> mode.
> 
> For a special scenario:
> command use parameter
> perf stat -a -e hns3_pmu_sicl_0/bdf=0x3700,config=0x3,queue=0x0,
> and hns3_pmu_is_enabled_func_mode() has a judgement as below:
> if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC))
> 
> filter_support of event 0x3 hasn't set bit for func mode, so it can't
> enter func-mode branch, and continue to func-queue mode judgement, port
> judgement, port-tc mode, then enter port-tc mode.
> 
> It's not up to expectations, it shouldn't enter any modes but
> return -ENOENT.
> 
> port-tc mode parameter show as below:
> perf stat -a -e hns3_pmu_sicl_0/config=0x00001,port=0x0,tc=0x1
> 
> port-tc mode should use bdf parameter as 0, so, add judgement of
> bdf parameter to fix it.

I don't follow the description here.  As far as I can see from the code
the change just checks that BDF is not set before allowing a port based
filter.

> 
> Signed-off-by: Hao Chen <chenhao418@huawei.com>
> Signed-off-by: Jijie Shao <shaojijie@huawei.com>
> ---
> changeLog:
>   v2: add more details in log message suggested by Will
>   v1 link: https://lore.kernel.org/all/20230816094619.3563784-1-shaojijie@huawei.com/
> ---
>  drivers/perf/hisilicon/hns3_pmu.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/perf/hisilicon/hns3_pmu.c b/drivers/perf/hisilicon/hns3_pmu.c
> index e0457d84af6b..2aa9cb045705 100644
> --- a/drivers/perf/hisilicon/hns3_pmu.c
> +++ b/drivers/perf/hisilicon/hns3_pmu.c
> @@ -998,12 +998,13 @@ static bool
>  hns3_pmu_is_enabled_port_tc_mode(struct perf_event *event,
>  				 struct hns3_pmu_event_attr *pmu_event)
>  {
> +	u16 bdf = hns3_pmu_get_bdf(event);
>  	u8 tc_id = hns3_pmu_get_tc(event);
>  
>  	if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_PORT_TC))
>  		return false;
>  
> -	return tc_id != HNS3_PMU_FILTER_ALL_TC;
> +	return (tc_id != HNS3_PMU_FILTER_ALL_TC) && (!bdf);

No need for brackets on !bdf

>  }
>  
>  static bool


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Re: [PATCH V2 drivers/perf: hisi:] drivers/perf: hisi: fix set wrong filter mode for running events issue

[chenhao (EZ)]

On 2023/9/1 18:11, Jonathan Cameron wrote:
> On Fri, 1 Sep 2023 11:50:27 +0800
> Jijie Shao <shaojijie@huawei.com> wrote:
> 
>> From: Hao Chen <chenhao418@huawei.com>
> 
> Mention which hisi pmu this is in the patch description (hns)
> 
>>
>> hns3_pmu_select_filter_mode() includes A series of mode judgments such
> 
> includes a series
> 
>> as global mode ,function mode, function-queue mode, port mode, port-tc
>> mode.
>>
>> For a special scenario:
>> command use parameter
>> perf stat -a -e hns3_pmu_sicl_0/bdf=0x3700,config=0x3,queue=0x0,
>> and hns3_pmu_is_enabled_func_mode() has a judgement as below:
>> if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC))
>>
>> filter_support of event 0x3 hasn't set bit for func mode, so it can't
>> enter func-mode branch, and continue to func-queue mode judgement, port
>> judgement, port-tc mode, then enter port-tc mode.
>>
>> It's not up to expectations, it shouldn't enter any modes but
>> return -ENOENT.
>>
>> port-tc mode parameter show as below:
>> perf stat -a -e hns3_pmu_sicl_0/config=0x00001,port=0x0,tc=0x1
>>
>> port-tc mode should use bdf parameter as 0, so, add judgement of
>> bdf parameter to fix it.
> 
> I don't follow the description here.  As far as I can see from the code
> the change just checks that BDF is not set before allowing a port based
> filter.

Thanks for review.

Maybe I don't think about it completely.

For this patch, I only consider this scenario mentioned in patch and exactly filter out
port based mode, then enter port-tc based mode.

Actually port based mode also need this change for other scenarios, do you agree with it?

> 
>>
>> Signed-off-by: Hao Chen <chenhao418@huawei.com>
>> Signed-off-by: Jijie Shao <shaojijie@huawei.com>
>> ---
>> changeLog:
>>   v2: add more details in log message suggested by Will
>>   v1 link: https://lore.kernel.org/all/20230816094619.3563784-1-shaojijie@huawei.com/
>> ---
>>  drivers/perf/hisilicon/hns3_pmu.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/perf/hisilicon/hns3_pmu.c b/drivers/perf/hisilicon/hns3_pmu.c
>> index e0457d84af6b..2aa9cb045705 100644
>> --- a/drivers/perf/hisilicon/hns3_pmu.c
>> +++ b/drivers/perf/hisilicon/hns3_pmu.c
>> @@ -998,12 +998,13 @@ static bool
>>  hns3_pmu_is_enabled_port_tc_mode(struct perf_event *event,
>>  				 struct hns3_pmu_event_attr *pmu_event)
>>  {
>> +	u16 bdf = hns3_pmu_get_bdf(event);
>>  	u8 tc_id = hns3_pmu_get_tc(event);
>>  
>>  	if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_PORT_TC))
>>  		return false;
>>  
>> -	return tc_id != HNS3_PMU_FILTER_ALL_TC;
>> +	return (tc_id != HNS3_PMU_FILTER_ALL_TC) && (!bdf);
> 
> No need for brackets on !bdf
> 
>>  }
>>  
>>  static bool
> 
> .
> 

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Re: [PATCH V2 drivers/perf: hisi:] drivers/perf: hisi: fix set wrong filter mode for running events issue

[Yicong Yang]

On 2023/9/1 11:50, Jijie Shao wrote:
> From: Hao Chen <chenhao418@huawei.com>
> 
> hns3_pmu_select_filter_mode() includes A series of mode judgments such
> as global mode ,function mode, function-queue mode, port mode, port-tc
> mode.
> 
> For a special scenario:
> command use parameter
> perf stat -a -e hns3_pmu_sicl_0/bdf=0x3700,config=0x3,queue=0x0,
> and hns3_pmu_is_enabled_func_mode() has a judgement as below:
> if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC))
> 
> filter_support of event 0x3 hasn't set bit for func mode, so it can't
> enter func-mode branch, and continue to func-queue mode judgement, port
> judgement, port-tc mode, then enter port-tc mode.
> 
> It's not up to expectations, it shouldn't enter any modes but
> return -ENOENT.
> 
> port-tc mode parameter show as below:
> perf stat -a -e hns3_pmu_sicl_0/config=0x00001,port=0x0,tc=0x1
> 
> port-tc mode should use bdf parameter as 0, so, add judgement of
> bdf parameter to fix it.
> 

Will the change here block the below unsupported case for event 0x3?

$ perf stat -a -e hns3_pmu_sicl_0/bdf=0x0,config=0x3,queue=0x0/

Otherwise you should handle this case.

> Signed-off-by: Hao Chen <chenhao418@huawei.com>
> Signed-off-by: Jijie Shao <shaojijie@huawei.com>
> ---
> changeLog:
>   v2: add more details in log message suggested by Will
>   v1 link: https://lore.kernel.org/all/20230816094619.3563784-1-shaojijie@huawei.com/
> ---
>  drivers/perf/hisilicon/hns3_pmu.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/perf/hisilicon/hns3_pmu.c b/drivers/perf/hisilicon/hns3_pmu.c
> index e0457d84af6b..2aa9cb045705 100644
> --- a/drivers/perf/hisilicon/hns3_pmu.c
> +++ b/drivers/perf/hisilicon/hns3_pmu.c
> @@ -998,12 +998,13 @@ static bool
>  hns3_pmu_is_enabled_port_tc_mode(struct perf_event *event,
>  				 struct hns3_pmu_event_attr *pmu_event)
>  {
> +	u16 bdf = hns3_pmu_get_bdf(event);
>  	u8 tc_id = hns3_pmu_get_tc(event);
>  
>  	if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_PORT_TC))
>  		return false;
>  
> -	return tc_id != HNS3_PMU_FILTER_ALL_TC;
> +	return (tc_id != HNS3_PMU_FILTER_ALL_TC) && (!bdf);
>  }
>  
>  static bool
> 

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Re: [PATCH V2 drivers/perf: hisi:] drivers/perf: hisi: fix set wrong filter mode for running events issue

[chenhao (EZ)]

On 2023/9/6 14:26, Yicong Yang wrote:
> On 2023/9/1 11:50, Jijie Shao wrote:
>> From: Hao Chen <chenhao418@huawei.com>
>>
>> hns3_pmu_select_filter_mode() includes A series of mode judgments such
>> as global mode ,function mode, function-queue mode, port mode, port-tc
>> mode.
>>
>> For a special scenario:
>> command use parameter
>> perf stat -a -e hns3_pmu_sicl_0/bdf=0x3700,config=0x3,queue=0x0,
>> and hns3_pmu_is_enabled_func_mode() has a judgement as below:
>> if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC))
>>
>> filter_support of event 0x3 hasn't set bit for func mode, so it can't
>> enter func-mode branch, and continue to func-queue mode judgement, port
>> judgement, port-tc mode, then enter port-tc mode.
>>
>> It's not up to expectations, it shouldn't enter any modes but
>> return -ENOENT.
>>
>> port-tc mode parameter show as below:
>> perf stat -a -e hns3_pmu_sicl_0/config=0x00001,port=0x0,tc=0x1
>>
>> port-tc mode should use bdf parameter as 0, so, add judgement of
>> bdf parameter to fix it.
>>
> 
> Will the change here block the below unsupported case for event 0x3?
> 
> $ perf stat -a -e hns3_pmu_sicl_0/bdf=0x0,config=0x3,queue=0x0/
> 
> Otherwise you should handle this case.
> 

Yes, it can't block this scenario, this modify of judgement for bdf is not inappropriate.

I will think another scheme to handle this issue.

>> Signed-off-by: Hao Chen <chenhao418@huawei.com>
>> Signed-off-by: Jijie Shao <shaojijie@huawei.com>
>> ---
>> changeLog:
>>   v2: add more details in log message suggested by Will
>>   v1 link: https://lore.kernel.org/all/20230816094619.3563784-1-shaojijie@huawei.com/
>> ---
>>  drivers/perf/hisilicon/hns3_pmu.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/perf/hisilicon/hns3_pmu.c b/drivers/perf/hisilicon/hns3_pmu.c
>> index e0457d84af6b..2aa9cb045705 100644
>> --- a/drivers/perf/hisilicon/hns3_pmu.c
>> +++ b/drivers/perf/hisilicon/hns3_pmu.c
>> @@ -998,12 +998,13 @@ static bool
>>  hns3_pmu_is_enabled_port_tc_mode(struct perf_event *event,
>>  				 struct hns3_pmu_event_attr *pmu_event)
>>  {
>> +	u16 bdf = hns3_pmu_get_bdf(event);
>>  	u8 tc_id = hns3_pmu_get_tc(event);
>>  
>>  	if (!(pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_PORT_TC))
>>  		return false;
>>  
>> -	return tc_id != HNS3_PMU_FILTER_ALL_TC;
>> +	return (tc_id != HNS3_PMU_FILTER_ALL_TC) && (!bdf);
>>  }
>>  
>>  static bool
>>
> .
> 

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