From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
To: Yicong Yang <yangyicong@hisilicon.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
linux-pci@vger.kernel.org
Cc: helgaas@kernel.org, gregkh@linuxfoundation.org,
lorenzo.pieralisi@arm.com, will@kernel.org, mark.rutland@arm.com,
mathieu.poirier@linaro.org, suzuki.poulose@arm.com,
mike.leach@linaro.org, leo.yan@linaro.org,
jonathan.cameron@huawei.com, song.bao.hua@hisilicon.com,
john.garry@huawei.com, prime.zeng@huawei.com,
liuqi115@huawei.com, zhangshaokun@hisilicon.com,
yangyicong@hisilicon.com, linuxarm@huawei.com,
alexander.shishkin@linux.intel.com
Subject: Re: [PATCH RESEND 0/4] Add support for HiSilicon PCIe Tune and Trace device
Date: Sat, 17 Apr 2021 16:56:35 +0300 [thread overview]
Message-ID: <8735vpf20c.fsf@ashishki-desk.ger.corp.intel.com> (raw)
In-Reply-To: <1618654631-42454-1-git-send-email-yangyicong@hisilicon.com>
Yicong Yang <yangyicong@hisilicon.com> writes:
> The reason for not using perf is because there is no current support
> for uncore tracing in the perf facilities.
Not unless you count
$ perf list|grep -ic uncore
77
> We have our own format
> of data and don't need perf doing the parsing.
Perf has AUX buffers, which are used for all kinds of own formats.
> A similar approach for implementing this function is ETM, which use
> sysfs for configuring and a character device for dumping data.
And also perf. One reason ETM has a sysfs interface is because the
driver predates perf's AUX buffers. Can't say if it's the only
reason. I'm assuming you're talking about Coresight ETM.
> Greg has some comments on our implementation and doesn't advocate
> to build driver on debugfs [1]. So I resend this series to
> collect more feedbacks on the implementation of this driver.
>
> Hi perf and ETM related experts, is it suggested to adapt this driver
> to perf? Or is the debugfs approach acceptable? Otherwise use
Aside from the above, I don't think the use of debugfs for kernel ABIs
is ever encouraged.
Regards,
--
Ale
next prev parent reply other threads:[~2021-04-17 13:56 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-17 10:17 [PATCH RESEND 0/4] Add support for HiSilicon PCIe Tune and Trace device Yicong Yang
2021-04-17 10:17 ` [PATCH RESEND 1/4] hwtracing: Add trace function " Yicong Yang
2021-04-17 10:17 ` [PATCH RESEND 2/4] hwtracing: Add tune " Yicong Yang
2021-04-17 10:17 ` [PATCH RESEND 3/4] docs: Add HiSilicon PTT device driver documentation Yicong Yang
2021-04-19 9:07 ` Daniel Thompson
2021-04-19 13:12 ` Yicong Yang
2021-04-17 10:17 ` [PATCH RESEND 4/4] MAINTAINERS: Add maintainer for HiSilicon PTT driver Yicong Yang
2021-04-17 13:56 ` Alexander Shishkin [this message]
2021-04-19 13:03 ` [PATCH RESEND 0/4] Add support for HiSilicon PCIe Tune and Trace device Yicong Yang
2021-04-22 3:49 ` Leo Yan
2021-04-22 12:54 ` Yicong Yang
2021-04-19 11:17 ` Suzuki K Poulose
2021-04-19 13:21 ` Yicong Yang
2021-04-19 16:11 ` Suzuki K Poulose
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