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Diffstat (limited to 'Documentation/trace/hisi-ptt.rst')
| -rw-r--r-- | Documentation/trace/hisi-ptt.rst | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/Documentation/trace/hisi-ptt.rst b/Documentation/trace/hisi-ptt.rst index 4f87d8e21065..989255eb5622 100644 --- a/Documentation/trace/hisi-ptt.rst +++ b/Documentation/trace/hisi-ptt.rst @@ -148,14 +148,20 @@ For example, if the desired filter is Endpoint function 0000:01:00.1 the filter value will be 0x00101. If the desired filter is Root Port 0000:00:10.0 then then filter value is calculated as 0x80001. +The driver also presents every supported Root Port and Requester filter through +sysfs. Each filter will be an individual file with name of its related PCIe +device name (domain:bus:device.function). The files of Root Port filters are +under $(PTT PMU dir)/root_port_filters and files of Requester filters +are under $(PTT PMU dir)/requester_filters. + Note that multiple Root Ports can be specified at one time, but only one Endpoint function can be specified in one trace. Specifying both Root Port and function at the same time is not supported. Driver maintains a list of available filters and will check the invalid inputs. -Currently the available filters are detected in driver's probe. If the supported -devices are removed/added after probe, you may need to reload the driver to update -the filters. +The available filters will be dynamically updated, which means you will always +get correct filter information when hotplug events happen, or when you manually +remove/rescan the devices. 2. Type ------- |