Change Log ========== - move the &plat_dev->dev to previous line to warp more beautiful (Per Jonathan) - rename error label with the same suffix 'err' (Per Jonathan) - drop unnecessary else branch and return directly (Per Baolin) - warp out set prev_count from dwc_pcie_pmu_set_period (Per Baolin) - use PMU_FORMAT_ATTR to simplify format sysfs stuff (Per Will) - export pci_clear_and_set_dword() to simplify _enable() functions (Per Will) - simplify _read() function by unconditionally calculate with unit in bytes plused if branch for group#1 event (Per Will and Robin) - simplify _update() function by unconditionally mask with 64-bit width plused if branch for lane event (Per Will) - add type sanity check in _init() (Per Will) - test with fuzzing tool before this new version (Per Will) - register a platform device for each PCI device to probe RAS_DES PMU cap (Per Robin) - add dwc_pcie_vendor_ids to extend vendor id for future added device (Per Krishna) - pickup review-by tag from Baolin, Yicong and Jonathan changes since v8: - tidy up doc and pick up Reviewed-by tag in pathc 1/4 (Per Yicong and Jonathan) - rename ras_des as ras_des_offset and remove coment about it (Per Jonathan) - keep exact reverse order of what happened in probe when unregister pmu (Per Jonathan) - remove the hender length check to make the driver more compatible (Per Jonathan) - move unwind of register pmu forward to fix list_del() on something that was never added (Per Jonathan) - use devm_add_action_or_reset() to unwind bus_register_notifier() (Per Jonathan) - use local pdev directly in dwc_pcie_pmu_offline_cpu() and dwc_pcie_pmu_probe() (Per Jonathan) - use the approach of a gotos to handle errors in dwc_pcie_pmu_init() (Per Jonathan) - multiply the counter value at point of read by 16 for group#1 events (Per Jonathan) changes since v7: - add config help with alibaba name (per Bjorn) - remove the ARM64 dependency (per Bjorn and Jonathan) - fix typo and column warp (per Bjorn) - move list_del() after perf_pmu_unregister() (per Bjorn) - reorder the funtions by interests (per Bjorn) - rewrite commit log about PMU counters, also update doc (per Bjorn) - extend to support stat time-based analysis and lane event at the same time (per Bjorn and Jonathan) Link: https://lore.kernel.org/linux-arm-kernel/20231012032856.2640-2-xueshuai@xxxxxxxxxxxxxxxxx/T/ changes since v6: - improve editorial things in doc (Per Jonathan) - change config help to generic text (Per Jonathan) - remove macro to_dwc_pcie_pmu by moving pmu as the first member to struct dwc_pcie_pmu (Per Yicong) - add event type check in dwc_pcie_event_show() to keep consistent with other function (Per Jonathan) - remove intended blank line (Per Yicong) - protect against lower 32 bits of counter overflow by try again trick (Per Jonathan) - call pci_dev_put on all the return branch to keep the refcnt balance (Per Jonathan and Yicong) - use devm_add_action_or_reset() to automatic unwind (Per Jonathan) - fix picking numa-aware context cpu up when offline and offline cpu (Per Jonathan) - simplify online cpu by init pcie_pmu->on_cpu as -1 (Per Jonathan) - add bus_register_notifier() to handle rootport hotplug (Per Yicong) - pick up Acked-by from Bjorn for patch 2/4 (Per Bjorn) Link: https://lore.kernel.org/lkml/20230606074938.97724-1-xueshuai@xxxxxxxxxxxxxxxxx/T/ changes since v5: - Rewrite the commit log to follow policy in pci_ids.h (Bjorn Helgaas) - return error code when __dwc_pcie_pmu_probe failed (Baolin Wang) - call 'cpuhp_remove_multi_state()' when exiting the driver. (Baolin Wang) - pick up Review-by tag from Baolin for Patch 1 and 3 Link: https://lore.kernel.org/lkml/ZGuSimj1cuQl3W5L@bhelgaas/T/#mba3fa2572dde0deddb40b5b24a31f4df41004bdf changes since v4: 1. addressing commens from Bjorn Helgaas: - reorder the includes by alpha - change all macros with upper-case hex - change ras_des type into u16 - remove unnecessary outer "()" - minor format changes 2. Address commensts from Jonathan Cameron: - rewrite doc and add a example to show how to use lane event 3. fix compile error reported by: kernel test robot - remove COMPILE_TEST and add depend on PCI in kconfig - add Reported-by: kernel test robot <lkp@xxxxxxxxx> Changes since v3: 1. addressing comments from Robin Murphy: - add a prepare patch to define pci id in linux/pci_ids.h - remove unnecessary 64BIT dependency - fix DWC_PCIE_PER_EVENT_OFF/ON macro - remove dwc_pcie_pmu struct and move all its fileds into dwc_pcie_rp_info - remove unnecessary format field show - use sysfs_emit() instead of all the assorted sprintf() and snprintf() calls. - remove unnecessary spaces and remove unnecessary cast to follow event show convention - remove pcie_pmu_event_attr_is_visible - fix a refcout leak on error branch when walk pci device in for_each_pci_dev - remove bdf field from dwc_pcie_rp_info and calculate it at runtime - finish all the checks before allocating rp_info to avoid hanging wasted memory - remove some unused fields - warp out control register configuration from sub function to .add() - make function return type with a proper signature - fix lane event count enable by clear DWC_PCIE_CNT_ENABLE field first - pass rp_info directly to the read_*_counter helpers and in start, stop and add callbacks - move event type validtion into .event_init() - use is_sampling_event() to be consistent with everything else of pmu drivers - remove unnecessary dev_err message in .event_init() - return EINVAL instead EOPNOTSUPP for not a valid event - finish all the checks before start modifying the event - fix sibling event check by comparing event->pmu with sibling->pmu - probe PMU for each rootport independently - use .update() as .read() directly - remove dynamically generating symbolic name of lane event - redefine static symbolic name of lane event and leave lane filed to user - add CPU hotplug support 2. addressing comments from Baolin: - add a mask to avoid possible overflow Changes since v2 addressing comments from Baolin: - remove redundant macro definitions - use dev_err to print error message - change pmu_is_register to boolean - use PLATFORM_DEVID_NONE macro - fix module author format Changes since v1: 1. address comments from Jonathan: - drop marco for PMU name and VSEC version - simplify code with PCI standard marco - simplify code with FIELD_PREP()/FIELD_GET() to replace shift marco - name register filed with single _ instead double - wrap dwc_pcie_pmu_{write}_dword out and drop meaningless snaity check - check vendor id while matching vesc with pci_find_vsec_capability() - remove RP_NUM_MAX and use a list to organize PMU devices for rootports - replace DWC_PCIE_CREATE_BDF with standard PCI_DEVID - comments on riping register together 2. address comments from Bjorn: - rename DWC_PCIE_VSEC_ID to DWC_PCIE_VSEC_RAS_DES_ID - rename cap_pos to ras_des - simplify declare of device_attribute with DEVICE_ATTR_RO - simplify code with PCI standard macro and API like pcie_get_width_cap() - fix some code style problem and typo - drop meaningless snaity check of container_of 3. address comments from Yicong: - use sysfs_emit() to replace sprintf() - simplify iteration of pci device with for_each_pci_dev - pick preferred CPUs on a near die and add comments - unregister PMU drivers only for failed ones - log on behalf PMU device and give more hint - fix some code style problem (Thanks for all comments and they are very valuable to me) Shuai Xue (5): docs: perf: Add description for Synopsys DesignWare PCIe PMU driver PCI: Add Alibaba Vendor ID to linux/pci_ids.h PCI: move pci_clear_and_set_dword helper to pci header drivers/perf: add DesignWare PCIe PMU driver MAINTAINERS: add maintainers for DesignWare PCIe PMU driver .../admin-guide/perf/dwc_pcie_pmu.rst | 94 +++ Documentation/admin-guide/perf/index.rst | 1 + MAINTAINERS | 7 + drivers/infiniband/hw/erdma/erdma_hw.h | 2 - drivers/pci/access.c | 12 + drivers/pci/pcie/aspm.c | 11 - drivers/perf/Kconfig | 7 + drivers/perf/Makefile | 1 + drivers/perf/dwc_pcie_pmu.c | 798 ++++++++++++++++++ include/linux/pci.h | 2 + include/linux/pci_ids.h | 2 + 11 files changed, 924 insertions(+), 13 deletions(-) create mode 100644 Documentation/admin-guide/perf/dwc_pcie_pmu.rst create mode 100644 drivers/perf/dwc_pcie_pmu.c -- 2.39.3
