linux-kernel - Re: [PATCH v10 2/2] drivers/perf: hisi: Add driver for HiSilicon PCIe PMU

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Message-ID: <1cfb14bb-82a2-1923-d02f-892041f01ad5@huawei.com>
Date:   Fri, 8 Oct 2021 10:41:33 +0800
From:   "liuqi (BA)" <liuqi115@...wei.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>, <will@...nel.org>
CC:     <mark.rutland@....com>, <bhelgaas@...gle.com>,
        <linux-pci@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <zhangshaokun@...ilicon.com>
Subject: Re: [PATCH v10 2/2] drivers/perf: hisi: Add driver for HiSilicon PCIe
 PMU

On 2021/10/6 22:06, Jonathan Cameron wrote:
> On Wed, 15 Sep 2021 15:45:24 +0800
> Qi Liu <liuqi115@...wei.com> wrote:
> 
>> PCIe PMU Root Complex Integrated End Point(RCiEP) device is supported
>> to sample bandwidth, latency, buffer occupation etc.
>>
>> Each PMU RCiEP device monitors multiple Root Ports, and each RCiEP is
>> registered as a PMU in /sys/bus/event_source/devices, so users can
>> select target PMU, and use filter to do further sets.
>>
>> Filtering options contains:
>> event     - select the event.
>> port      - select target Root Ports. Information of Root Ports are
>>              shown under sysfs.
>> bdf       - select requester_id of target EP device.
>> trig_len  - set trigger condition for starting event statistics.
>> trig_mode - set trigger mode. 0 means starting to statistic when bigger
>>              than trigger condition, and 1 means smaller.
>> thr_len   - set threshold for statistics.
>> thr_mode  - set threshold mode. 0 means count when bigger than threshold,
>>              and 1 means smaller.
>>
>> Reviewed-by: John Garry <john.garry@...wei.com>
>> Signed-off-by: Qi Liu <liuqi115@...wei.com>
>> ---
> Hi Qi,
> 
> One trivial thing I just noticed below that can be easily fixed up by a follow up
> patch if that makes sense.
> 
> Thanks,
> 
> Jonathan
> 
>> +/*
>> + * Events with the "dl" suffix in their names count performance in DL layer,
>> + * otherswise, events count performance in TL layer.
> 
> This comment looks to be out of date..
> 
Hi all,

Yes, this comment should be deleted, and I'll drop it in next version, 
thanks.

@Will, do you have any comments about this patchset?

Thanks,
Qi

>> + */
>> +static struct attribute *hisi_pcie_pmu_events_attr[] = {
>> +	HISI_PCIE_PMU_EVENT_ATTR(rx_mwr_latency, 0x0010),
>> +	HISI_PCIE_PMU_EVENT_ATTR(rx_mwr_cnt, 0x10010),
>> +	HISI_PCIE_PMU_EVENT_ATTR(rx_mrd_latency, 0x0210),
>> +	HISI_PCIE_PMU_EVENT_ATTR(rx_mrd_cnt, 0x10210),
>> +	HISI_PCIE_PMU_EVENT_ATTR(tx_mrd_latency, 0x0011),
>> +	HISI_PCIE_PMU_EVENT_ATTR(tx_mrd_cnt, 0x10011),
>> +	HISI_PCIE_PMU_EVENT_ATTR(rx_mrd_flux, 0x1005),
>> +	HISI_PCIE_PMU_EVENT_ATTR(rx_mrd_time, 0x11005),
>> +	HISI_PCIE_PMU_EVENT_ATTR(tx_mrd_flux, 0x2004),
>> +	HISI_PCIE_PMU_EVENT_ATTR(tx_mrd_time, 0x12004),
>> +	NULL
>> +};
> .
>