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| author | Yicong Yang <yangyicong@hisilicon.com> | 2023-06-21 11:28:02 +0200 |
|---|---|---|
| committer | Suzuki K Poulose <suzuki.poulose@arm.com> | 2023-06-21 12:52:09 +0200 |
| commit | 6373c463ac894e41cab24469d1947ff91aaea486 (patch) | |
| tree | 4fd134a66a7d31cd10544c323ee8fc161b1ab22d /Documentation/trace | |
| parent | hwtracing: hisi_ptt: Add support for dynamically updating the filter list (diff) | |
| download | linux-6373c463ac894e41cab24469d1947ff91aaea486.tar.xz linux-6373c463ac894e41cab24469d1947ff91aaea486.zip | |
hwtracing: hisi_ptt: Export available filters through sysfs
The PTT can only filter the traced TLP headers by the Root Ports or the
Requester ID of the Endpoint, which are located on the same PCIe core of
the PTT device. The filter value used is derived from the BDF number of
the supported Root Port or the Endpoint. It's not friendly enough for the
users since it requires the user to be familiar enough with the platform
and calculate the filter value manually.
This patch export the available filters through sysfs. Each available
filters is presented as an individual file with the name of the BDF
number of the related PCIe device. The files are created under
$(PTT PMU dir)/available_root_port_filters and
$(PTT PMU dir)/available_requester_filters respectively. The filter
value can be known by reading the related file.
Then the users can easily know the available filters for trace and get
the filter values without calculating.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230621092804.15120-4-yangyicong@huawei.com
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/hisi-ptt.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/trace/hisi-ptt.rst b/Documentation/trace/hisi-ptt.rst index 69c538153838..989255eb5622 100644 --- a/Documentation/trace/hisi-ptt.rst +++ b/Documentation/trace/hisi-ptt.rst @@ -148,6 +148,12 @@ 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 |