[PATCH 0/4] Improve PTT filter interface and some fixes

[Yicong Yang]

From: Yicong Yang <yangyicong@xxxxxxxxxxxxx>

This series tends to improve the PTT's filter interface in 2 aspects (Patch 2&3):
- Support dynamically filter updating to response to hotplug
  Previous the supported filter list is settled down once the driver probed and
  it maybe out-of-date if hotplug events happen later. User need to reload the
  driver to update list. Patch 1/2 enable the driver to update the list by
  registering a PCI bus notifier and the filter list will always be the latest.
- Export the available filters through sysfs
  Previous user needs to calculate the filters and filter value using device's
  BDF number, which requires the user to know the hardware well. Patch 3/3 tends
  to export the available filter information through sysfs attributes, the filter
  value will be gotten by reading the file. This will be more user friendly.

Also includes a fix and an improve. Patch 1 tends to only export the online CPUs
supported by the PTT, this will make perf work properly when there's offline CPUs
within the node PTT locates. Patch 4 tends to set proper PMU capability to avoid
collecting unnecessary data to save the storage.

Yicong Yang (4):
  hwtracing: hisi_ptt: Make cpumask only present online CPUs
  hwtracing: hisi_ptt: Add support for dynamically updating the filter
    list
  hwtracing: hisi_ptt: Export available filters through sysfs
  hwtracing: hisi_ptt: Advertise PERF_PMU_CAP_NO_EXCLUDE for PTT PMU

 .../ABI/testing/sysfs-devices-hisi_ptt        |  50 +++
 Documentation/trace/hisi-ptt.rst              |  12 +-
 drivers/hwtracing/ptt/hisi_ptt.c              | 396 +++++++++++++++++-
 drivers/hwtracing/ptt/hisi_ptt.h              |  51 +++
 4 files changed, 498 insertions(+), 11 deletions(-)

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2.24.0