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it maybe out-of-date if hotplug events happen later.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(-)
--
2.24.0
