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SubjectRe: [PATCH v12 0/5] Add driver support for HiSilicon PCIe Tune and Trace device
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A gentle ping for this...

Thanks.

On 2022/8/16 19:44, Yicong Yang wrote:
> From: Yicong Yang <yangyicong@hisilicon.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 tune can be used through the sysfs attributes of related PMU device. See
> the documentation for the detailed usage.
>
> This patchset adds an initial driver support for the PTT device. The userspace
> perf tool support will be sent in a separate patchset.
>
> Change since v11:
> - Drop WARN_ON() for irq_set_affinity() failure per Greg
> - Split out userspace perf support patches according to the comments
> Link: https://lore.kernel.org/lkml/20220721130116.43366-1-yangyicong@huawei.com/
>
> 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!
> 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/
>
> 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 | 1047 +++++++++++++++++
> drivers/hwtracing/ptt/hisi_ptt.h | 200 ++++
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 21 +
> 11 files changed, 1653 insertions(+)
> 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
>

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