Re: [PATCH v6 0/4] drivers/perf: add Synopsys DesignWare PCIe PMU driver support

[Shuai Xue]

On 2023/6/16 16:39, Shuai Xue wrote:
> 
> 
> On 2023/6/6 15:49, Shuai Xue wrote:
>> 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
>>
>> 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)
>>
>> This patchset adds the PCIe Performance Monitoring Unit (PMU) driver support
>> for T-Head Yitian 710 SoC chip. Yitian 710 is based on the Synopsys PCI Express
>> Core controller IP which provides statistics feature.
>>
>> Shuai Xue (4):
>>   docs: perf: Add description for Synopsys DesignWare PCIe PMU driver
>>   PCI: Add Alibaba Vendor ID to linux/pci_ids.h
>>   drivers/perf: add DesignWare PCIe PMU driver
>>   MAINTAINERS: add maintainers for DesignWare PCIe PMU driver
>>
>>  .../admin-guide/perf/dwc_pcie_pmu.rst         |  97 +++
>>  Documentation/admin-guide/perf/index.rst      |   1 +
>>  MAINTAINERS                                   |   6 +
>>  drivers/infiniband/hw/erdma/erdma_hw.h        |   2 -
>>  drivers/perf/Kconfig                          |   7 +
>>  drivers/perf/Makefile                         |   1 +
>>  drivers/perf/dwc_pcie_pmu.c                   | 706 ++++++++++++++++++
>>  include/linux/pci_ids.h                       |   2 +
>>  8 files changed, 820 insertions(+), 2 deletions(-)
>>  create mode 100644 Documentation/admin-guide/perf/dwc_pcie_pmu.rst
>>  create mode 100644 drivers/perf/dwc_pcie_pmu.c
>>
> 
> Hi, all,
> 
> Gently ping. Any comments are welcomed.


Hi, all,

Gentle ping.


> 
> Thank you.
>
> 
> Best Regards,
> Shuai
> 
>