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

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Message-ID: <20230901111116.00006468@Huawei.com>
Date:   Fri, 1 Sep 2023 11:11:16 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Jijie Shao <shaojijie@...wei.com>
CC:     <will@...nel.org>, <mark.rutland@....com>,
        <yangyicong@...ilicon.com>, <chenhao418@...wei.com>,
        <shenjian15@...wei.com>, <wangjie125@...wei.com>,
        <liuyonglong@...wei.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V2 drivers/perf: hisi:] drivers/perf: hisi: fix set
 wrong filter mode for running events issue

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

> From: Hao Chen <chenhao418@...wei.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@...wei.com>
> Signed-off-by: Jijie Shao <shaojijie@...wei.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