From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A99BCC43334 for ; Mon, 25 Jul 2022 14:33:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235623AbiGYOdJ (ORCPT ); Mon, 25 Jul 2022 10:33:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60202 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235634AbiGYOdD (ORCPT ); Mon, 25 Jul 2022 10:33:03 -0400 Received: from mail-yw1-x112e.google.com (mail-yw1-x112e.google.com [IPv6:2607:f8b0:4864:20::112e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 10EDF17E22 for ; Mon, 25 Jul 2022 07:33:01 -0700 (PDT) Received: by mail-yw1-x112e.google.com with SMTP id 00721157ae682-31e7ca45091so111847207b3.3 for ; Mon, 25 Jul 2022 07:33:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=co9T2j4fIM1ZH3gXxAHTI60xfHFgHbaMpFRuKb9I9mA=; b=LiHjSSpfGMiVTnmOFY9QDuMQykTrxxXoASPsoaO5EV/5dKssAFUpuTGFe00f2SSjlN FOAW0BvfJH9OaIKi6uM4OtBwaiBHLECXKHkZx9Mcx2TTQ3cbCdJjxiKKfScEaYk1gJbD K0sQ8A9k9KEnGVfXaCGPsugcWwLxkvMnPyGYH6gT3oZ34m5oZU4s5SHfmBnGjiZx0/k/ 35QMlOjRK3tMlQ57OVC7eaAxkXZQECOcOy0VOLMWVw+jVfhzDa9TkqIpCPRwCNhs83IQ s64QtI+WTk5RkVEos1i/OK/Qf/F2N/p9Lz9YmUujR1ZBuZx2HpvouVX1RW78Jrdvof7S Hplw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=co9T2j4fIM1ZH3gXxAHTI60xfHFgHbaMpFRuKb9I9mA=; b=Vl9TOz3ECGXLLjIcsj2Jg5PcQrsdaR7v9XSVFAPfdBFf1nNu8DPpiJmIWqxRNBKZur tSE39DHW1rBCW0El9qTOAKkTLlHhWQUqnAwOmwOlzAQIrcGaAR7CZ/RrTW5bjzH9VRZr vYok+gXndh6T+8Tj3gzfywSwBE+Vq05q1ZGj8S5bGkJw/5LhmMbNnGB85h8KpZfD3lyT ty8lXR5H94ToimGfBabAaBF0VCoBzzLq4ACYA1PaNAoS48sjFR+5SxHN15sxBjQrn+eX Sf0CBDLIiO0liTu2qtucxUfyCykTzzr1fVlOAYc37NTVxyjZF08kolAhwUmJrGyxn2RF TOzA== X-Gm-Message-State: AJIora+OY0vbYQJqLi2GoxtffezrBj0wSDa+9S7rLvg+gumnRPSYsk/6 6wepa022nHYDxSJWSSpP5I+nlE1A8fawOmajd4JHfA== X-Google-Smtp-Source: AGRyM1sEQioLrd2kbDc3KyAQ0mWTBmoFsUxmuJGmnt7G9LaIPuFOzPcwpT04J7Se+2FZTpOmyE+j2tW3pFTDbd+QT0A= X-Received: by 2002:a0d:ea57:0:b0:31e:55f4:a03d with SMTP id t84-20020a0dea57000000b0031e55f4a03dmr10146248ywe.425.1658759579699; Mon, 25 Jul 2022 07:32:59 -0700 (PDT) MIME-Version: 1.0 References: <20220721130116.43366-1-yangyicong@huawei.com> <7adf0c72-521d-f117-5b5f-f8ce0ada44bd@gmail.com> In-Reply-To: <7adf0c72-521d-f117-5b5f-f8ce0ada44bd@gmail.com> From: Mathieu Poirier Date: Mon, 25 Jul 2022 08:32:47 -0600 Message-ID: Subject: Re: [PATCH v11 0/8] Add support for HiSilicon PCIe Tune and Trace device To: Yicong Yang Cc: alexander.shishkin@linux.intel.com, gregkh@linuxfoundation.org, leo.yan@linaro.org, james.clark@arm.com, will@kernel.org, robin.murphy@arm.com, acme@kernel.org, peterz@infradead.org, corbet@lwn.net, mark.rutland@arm.com, jonathan.cameron@huawei.com, john.garry@huawei.com, helgaas@kernel.org, lorenzo.pieralisi@arm.com, suzuki.poulose@arm.com, joro@8bytes.org, shameerali.kolothum.thodi@huawei.com, mingo@redhat.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-perf-users@vger.kernel.org, iommu@lists.linux-foundation.org, iommu@lists.linux.dev, linux-doc@vger.kernel.org, prime.zeng@huawei.com, liuqi115@huawei.com, zhangshaokun@hisilicon.com, linuxarm@huawei.com, yangyicong@hisilicon.com, bagasdotme@gmail.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 22 Jul 2022 at 08:53, Yicong Yang wrote: > > =E5=9C=A8 7/21/2022 11:43 PM, Mathieu Poirier =E5=86=99=E9=81=93: > > On Thu, 21 Jul 2022 at 07:03, wrote: > >> From: Yicong Yang > >> > >> HiSilicon PCIe tune and trace device (PTT) is a PCIe Root Complex > >> integrated Endpoint (RCiEP) device, providing the capability > >> to dynamically monitor and tune the PCIe traffic (tune), > >> and trace the TLP headers (trace). > >> > >> PTT tune is designed for monitoring and adjusting PCIe link parameters= . > >> We provide several parameters of the PCIe link. Through the driver, > >> user can adjust the value of certain parameter to affect the PCIe link > >> for the purpose of enhancing the performance in certian situation. > >> > >> PTT trace is designed for dumping the TLP headers to the memory, which > >> can be used to analyze the transactions and usage condition of the PCI= e > >> Link. Users can choose filters to trace headers, by either requester > >> ID, or those downstream of a set of Root Ports on the same core of the > >> PTT device. It's also supported to trace the headers of certain type a= nd > >> of certain direction. > >> > >> The driver registers a PMU device for each PTT device. The trace can > >> be used through `perf record` and the traced headers can be decoded > >> by `perf report`. The perf command support for the device is also > >> added in this patchset. The tune can be used through the sysfs > >> attributes of related PMU device. See the documentation for the > >> detailed usage. > >> > >> Change since v10: > >> - Use title case in the documentation > >> - Add RB from Bagas, thanks. > >> Link: https://lore.kernel.org/lkml/20220714092710.53486-1-yangyicong@h= isilicon.com/ > >> > >> Change since v9: > >> - Add sysfs ABI description documentation > >> - Remove the controversial available_{root_port, requester}_filters sy= sfs file > >> - Shorten 2 tune sysfs attributes name and add some comments > >> - Move hisi_ptt_process_auxtrace_info() to Patch 6. > >> - Add RB from Leo and Ack-by from Mathieu, thanks! > > You can add my Ack-by to patch 03 as well. See below for another comme= nt. > > Thanks! > > >> Link: https://lore.kernel.org/lkml/20220606115555.41103-1-yangyicong@h= isilicon.com/ > >> > >> Change since v8: > >> - Cleanups and one minor fix from Jonathan and John, thanks > >> Link: https://lore.kernel.org/lkml/20220516125223.32012-1-yangyicong@h= isilicon.com/ > >> > >> Change since v7: > >> - Configure the DMA in probe rather than in runtime. Also use devres t= o manage > >> PMU device as we have no order problem now > >> - Refactor the config validation function per John and Leo > >> - Use a spinlock hisi_ptt::pmu_lock instead of mutex to serialize the = perf process > >> in pmu::start as it's in atomic context > >> - Only commit the traced data when stop, per Leo and James > >> - Drop the filter dynamically updating patch from this series to simpl= y the review > >> of the driver. That patch will be send separately. > >> - add a cpumask sysfs attribute and handle the cpu hotplug events, fol= low the > >> uncore PMU convention > >> - Other cleanups and fixes, both in driver and perf tool > >> Link: https://lore.kernel.org/lkml/20220407125841.3678-1-yangyicong@hi= silicon.com/ > >> > >> Change since v6: > >> - Fix W=3D1 errors reported by lkp test, thanks > >> > >> Change since v5: > >> - Squash the PMU patch into PATCH 2 suggested by John > >> - refine the commit message of PATCH 1 and some comments > >> Link: https://lore.kernel.org/lkml/20220308084930.5142-1-yangyicong@hi= silicon.com/ > >> > >> Change since v4: > >> Address the comments from Jonathan, John and Ma Ca, thanks. > >> - Use devm* also for allocating the DMA buffers > >> - Remove the IRQ handler stub in Patch 2 > >> - Make functions waiting for hardware state return boolean > >> - Manual remove the PMU device as it should be removed first > >> - Modifier the orders in probe and removal to make them matched well > >> - Make available {directions,type,format} array const and non-global > >> - Using the right filter list in filters show and well protect the > >> list with mutex > >> - Record the trace status with a boolean @started rather than enum > >> - Optimize the process of finding the PTT devices of the perf-tool > >> Link: https://lore.kernel.org/linux-pci/20220221084307.33712-1-yangyic= ong@hisilicon.com/ > >> > >> Change since v3: > >> Address the comments from Jonathan and John, thanks. > >> - drop members in the common struct which can be get on the fly > >> - reduce buffer struct and organize the buffers with array instead of = list > >> - reduce the DMA reset wait time to avoid long time busy loop > >> - split the available_filters sysfs attribute into two files, for root= port > >> and requester respectively. Update the documentation accordingly > >> - make IOMMU mapping check earlier in probe to avoid race condition. A= lso > >> make IOMMU quirk patch prior to driver in the series > >> - Cleanups and typos fixes from John and Jonathan > >> Link: https://lore.kernel.org/linux-pci/20220124131118.17887-1-yangyic= ong@hisilicon.com/ > >> > >> Change since v2: > >> - address the comments from Mathieu, thanks. > >> - rename the directory to ptt to match the function of the device > >> - spinoff the declarations to a separate header > >> - split the trace function to several patches > >> - some other comments. > >> - make default smmu domain type of PTT device to identity > >> Drop the RMR as it's not recommended and use an iommu_def_domain_typ= e > >> quirk to passthrough the device DMA as suggested by Robin. > >> Link: https://lore.kernel.org/linux-pci/20211116090625.53702-1-yangyic= ong@hisilicon.com/ > >> > >> Change since v1: > >> - switch the user interface of trace to perf from debugfs > >> - switch the user interface of tune to sysfs from debugfs > >> - add perf tool support to start trace and decode the trace data > >> - address the comments of documentation from Bjorn > >> - add RMR[1] support of the device as trace works in RMR mode or > >> direct DMA mode. RMR support is achieved by common APIs rather > >> than the APIs implemented in [1]. > >> Link: https://lore.kernel.org/lkml/1618654631-42454-1-git-send-email-y= angyicong@hisilicon.com/ > >> [1] https://lore.kernel.org/linux-acpi/20210805080724.480-1-shameerali= .kolothum.thodi@huawei.com/ > >> > >> Qi Liu (3): > >> perf tool: arm: Refactor event list iteration in > >> auxtrace_record__init() > >> perf tool: Add support for HiSilicon PCIe Tune and Trace device driv= er > >> perf tool: Add support for parsing HiSilicon PCIe Trace packet > >> > >> Yicong Yang (5): > >> iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device = to > >> identity > >> hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe > >> Tune and Trace device > >> hwtracing: hisi_ptt: Add tune function support for HiSilicon PCIe Tu= ne > >> and Trace device > >> docs: trace: Add HiSilicon PTT device driver documentation > >> MAINTAINERS: Add maintainer for HiSilicon PTT driver > >> > >> .../ABI/testing/sysfs-devices-hisi_ptt | 61 + > >> Documentation/trace/hisi-ptt.rst | 298 +++++ > >> Documentation/trace/index.rst | 1 + > >> MAINTAINERS | 8 + > >> drivers/Makefile | 1 + > >> drivers/hwtracing/Kconfig | 2 + > >> drivers/hwtracing/ptt/Kconfig | 12 + > >> drivers/hwtracing/ptt/Makefile | 2 + > >> drivers/hwtracing/ptt/hisi_ptt.c | 1032 ++++++++++++++++= + > >> drivers/hwtracing/ptt/hisi_ptt.h | 200 ++++ > >> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 21 + > > Everything above needs to go in one patchset and everything below in > > another one. The first patchset will need to be merged before the > > second one. Someone already commented on that. > > ok. I put them together to provide an overall view of this and thought ma= intainers can take > them separately. Will spilt the driver part and perf tool patches. > > I still don't know who will finally take the driver part. It should be Al= exander from maintainer > list but I got no response yet for a long time. Any hint for this? It will either be Peter, Greg or myself. We'll see when we get there. 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List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gRnJpLCAyMiBKdWwgMjAyMiBhdCAwODo1MywgWWljb25nIFlhbmcgPHlhbmd5Y2NjY2NAZ21h aWwuY29tPiB3cm90ZToKPgo+IOWcqCA3LzIxLzIwMjIgMTE6NDMgUE0sIE1hdGhpZXUgUG9pcmll ciDlhpnpgZM6Cj4gPiBPbiBUaHUsIDIxIEp1bCAyMDIyIGF0IDA3OjAzLCA8eWFuZ3lpY29uZ0Bo dWF3ZWkuY29tPiB3cm90ZToKPiA+PiBGcm9tOiBZaWNvbmcgWWFuZyA8eWFuZ3lpY29uZ0BoaXNp bGljb24uY29tPgo+ID4+Cj4gPj4gSGlTaWxpY29uIFBDSWUgdHVuZSBhbmQgdHJhY2UgZGV2aWNl IChQVFQpIGlzIGEgUENJZSBSb290IENvbXBsZXgKPiA+PiBpbnRlZ3JhdGVkIEVuZHBvaW50IChS Q2lFUCkgZGV2aWNlLCBwcm92aWRpbmcgdGhlIGNhcGFiaWxpdHkKPiA+PiB0byBkeW5hbWljYWxs eSBtb25pdG9yIGFuZCB0dW5lIHRoZSBQQ0llIHRyYWZmaWMgKHR1bmUpLAo+ID4+IGFuZCB0cmFj ZSB0aGUgVExQIGhlYWRlcnMgKHRyYWNlKS4KPiA+Pgo+ID4+IFBUVCB0dW5lIGlzIGRlc2lnbmVk IGZvciBtb25pdG9yaW5nIGFuZCBhZGp1c3RpbmcgUENJZSBsaW5rIHBhcmFtZXRlcnMuCj4gPj4g 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