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Date: Fri, 22 Jul 2022 22:52:47 +0800
From: Yicong Yang <yangyccccc@...il.com>
To: Mathieu Poirier <mathieu.poirier@...aro.org>,
alexander.shishkin@...ux.intel.com
Cc: gregkh@...uxfoundation.org, leo.yan@...aro.org,
james.clark@....com, will@...nel.org, robin.murphy@....com,
acme@...nel.org, peterz@...radead.org, corbet@....net,
mark.rutland@....com, jonathan.cameron@...wei.com,
john.garry@...wei.com, helgaas@...nel.org,
lorenzo.pieralisi@....com, suzuki.poulose@....com, joro@...tes.org,
shameerali.kolothum.thodi@...wei.com, mingo@...hat.com,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-pci@...r.kernel.org, linux-perf-users@...r.kernel.org,
iommu@...ts.linux-foundation.org, iommu@...ts.linux.dev,
linux-doc@...r.kernel.org, prime.zeng@...wei.com,
liuqi115@...wei.com, zhangshaokun@...ilicon.com,
linuxarm@...wei.com, yangyicong@...ilicon.com, bagasdotme@...il.com
Subject: Re: [PATCH v11 0/8] Add support for HiSilicon PCIe Tune and Trace
device
在 7/21/2022 11:43 PM, Mathieu Poirier 写道:
> On Thu, 21 Jul 2022 at 07:03, <yangyicong@...wei.com> wrote:
>> From: Yicong Yang <yangyicong@...ilicon.com>
>>
>> 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 PCIe
>> 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 and
>> 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@hisilicon.com/
>>
>> Change since v9:
>> - Add sysfs ABI description documentation
>> - Remove the controversial available_{root_port, requester}_filters sysfs 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 comment.
Thanks!
>> Link: https://lore.kernel.org/lkml/20220606115555.41103-1-yangyicong@hisilicon.com/
>>
>> Change since v8:
>> - Cleanups and one minor fix from Jonathan and John, thanks
>> Link: https://lore.kernel.org/lkml/20220516125223.32012-1-yangyicong@hisilicon.com/
>>
>> Change since v7:
>> - Configure the DMA in probe rather than in runtime. Also use devres to 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 simply the review
>> of the driver. That patch will be send separately.
>> - add a cpumask sysfs attribute and handle the cpu hotplug events, follow the
>> uncore PMU convention
>> - Other cleanups and fixes, both in driver and perf tool
>> Link: https://lore.kernel.org/lkml/20220407125841.3678-1-yangyicong@hisilicon.com/
>>
>> Change since v6:
>> - Fix W=1 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@hisilicon.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-yangyicong@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. Also
>> 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-yangyicong@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_type
>> quirk to passthrough the device DMA as suggested by Robin.
>> Link: https://lore.kernel.org/linux-pci/20211116090625.53702-1-yangyicong@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-yangyicong@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 driver
>> 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 Tune
>> 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 maintainers 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 Alexander from maintainer
list but I got no response yet for a long time. Any hint for this?
Thanks.
>> tools/perf/arch/arm/util/auxtrace.c | 116 +-
>> tools/perf/arch/arm/util/pmu.c | 3 +
>> tools/perf/arch/arm64/util/Build | 2 +-
>> tools/perf/arch/arm64/util/hisi-ptt.c | 188 +++
>> tools/perf/util/Build | 2 +
>> tools/perf/util/auxtrace.c | 4 +
>> tools/perf/util/auxtrace.h | 1 +
>> tools/perf/util/hisi-ptt-decoder/Build | 1 +
>> .../hisi-ptt-decoder/hisi-ptt-pkt-decoder.c | 164 +++
>> .../hisi-ptt-decoder/hisi-ptt-pkt-decoder.h | 31 +
>> tools/perf/util/hisi-ptt.c | 192 +++
>> tools/perf/util/hisi-ptt.h | 19 +
>> 23 files changed, 2341 insertions(+), 20 deletions(-)
>> create mode 100644 Documentation/ABI/testing/sysfs-devices-hisi_ptt
>> create mode 100644 Documentation/trace/hisi-ptt.rst
>> create mode 100644 drivers/hwtracing/ptt/Kconfig
>> create mode 100644 drivers/hwtracing/ptt/Makefile
>> create mode 100644 drivers/hwtracing/ptt/hisi_ptt.c
>> create mode 100644 drivers/hwtracing/ptt/hisi_ptt.h
>> create mode 100644 tools/perf/arch/arm64/util/hisi-ptt.c
>> create mode 100644 tools/perf/util/hisi-ptt-decoder/Build
>> create mode 100644 tools/perf/util/hisi-ptt-decoder/hisi-ptt-pkt-decoder.c
>> create mode 100644 tools/perf/util/hisi-ptt-decoder/hisi-ptt-pkt-decoder.h
>> create mode 100644 tools/perf/util/hisi-ptt.c
>> create mode 100644 tools/perf/util/hisi-ptt.h
>>
>> --
>> 2.24.0
>>
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