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    SubjectRe: [PATCH v3 0/8] Add support for HiSilicon PCIe Tune and Trace device
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    Hi perf, ETM and PCI related experts,

    a gentle ping ... appreciate for the comments.

    thanks.

    On 2022/1/24 21:11, Yicong Yang wrote:
    > 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 v2:
    > - address the comments from Mathieu
    > - 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 (1):
    > perf tool: Add support for HiSilicon PCIe Tune and Trace device driver
    >
    > Yicong Yang (7):
    > hwtracing: Add trace function support for HiSilicon PCIe Tune and
    > Trace device
    > hisi_ptt: Register PMU device for PTT trace
    > hisi_ptt: Add support for dynamically updating the filter list
    > hisi_ptt: Add tune function support for HiSilicon PCIe Tune and Trace
    > device
    > docs: Add HiSilicon PTT device driver documentation
    > MAINTAINERS: Add maintainer for HiSilicon PTT driver
    > iommu/arm-smmu-v3: Make default domain type of HiSilicon PTT device to
    > identity
    >
    > Documentation/trace/hisi-ptt.rst | 304 +++++
    > MAINTAINERS | 7 +
    > drivers/Makefile | 1 +
    > drivers/hwtracing/Kconfig | 2 +
    > drivers/hwtracing/ptt/Kconfig | 11 +
    > drivers/hwtracing/ptt/Makefile | 2 +
    > drivers/hwtracing/ptt/hisi_ptt.c | 1124 +++++++++++++++++
    > drivers/hwtracing/ptt/hisi_ptt.h | 239 ++++
    > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 16 +
    > tools/perf/arch/arm/util/auxtrace.c | 56 +-
    > tools/perf/arch/arm/util/pmu.c | 3 +
    > tools/perf/arch/arm64/util/Build | 2 +-
    > tools/perf/arch/arm64/util/hisi_ptt.c | 195 +++
    > 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 | 170 +++
    > .../hisi-ptt-decoder/hisi-ptt-pkt-decoder.h | 28 +
    > tools/perf/util/hisi_ptt.c | 228 ++++
    > tools/perf/util/hisi_ptt.h | 28 +
    > 21 files changed, 2420 insertions(+), 4 deletions(-)
    > 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
    >

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