On Tue, Aug 16, 2022 at 07:44:09PM +0800, Yicong Yang wrote: > From: Yicong Yang <yangyicong@xxxxxxxxxxxxx> > > 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@xxxxxxxxxx/ > > Change since v10: > - Use title case in the documentation > - Add RB from Bagas, thanks. > Link: https://lore.kernel.org/lkml/20220714092710.53486-1-yangyicong@xxxxxxxxxxxxx/ > > 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@xxxxxxxxxxxxx/ > > Change since v8: > - Cleanups and one minor fix from Jonathan and John, thanks > Link: https://lore.kernel.org/lkml/20220516125223.32012-1-yangyicong@xxxxxxxxxxxxx/ > > 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@xxxxxxxxxxxxx/ > > 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@xxxxxxxxxxxxx/ > > 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@xxxxxxxxxxxxx/ > > 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@xxxxxxxxxxxxx/ > > 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@xxxxxxxxxxxxx/ > > 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@xxxxxxxxxxxxx/ > [1] https://lore.kernel.org/linux-acpi/20210805080724.480-1-shameerali.kolothum.thodi@xxxxxxxxxx/ > > 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 + I fixed the month and kernel revision in sysfs-devices-hisi_ptt before applying this set. You can double check that everything is to your liking in the coresight next tree[1]. Thanks, Mathieu [1]. https://git.kernel.org/pub/scm/linux/kernel/git/coresight/linux.git/log/?h=next > 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 > > -- > 2.24.0 >
