diff options
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/index.rst | 1 | ||||
| -rw-r--r-- | Documentation/trace/intel_th.rst (renamed from Documentation/trace/intel_th.txt) | 43 |
2 files changed, 23 insertions, 21 deletions
diff --git a/Documentation/trace/index.rst b/Documentation/trace/index.rst index eabbbafaa36e..02cc56c3eda9 100644 --- a/Documentation/trace/index.rst +++ b/Documentation/trace/index.rst @@ -19,3 +19,4 @@ Linux Tracing Technologies events-msr mmiotrace hwlat_detector + intel_th diff --git a/Documentation/trace/intel_th.txt b/Documentation/trace/intel_th.rst index 7a57165c2492..990f13265178 100644 --- a/Documentation/trace/intel_th.txt +++ b/Documentation/trace/intel_th.rst @@ -1,3 +1,4 @@ +======================= Intel(R) Trace Hub (TH) ======================= @@ -18,13 +19,13 @@ via sysfs attributes. Currently, the following Intel TH subdevices (blocks) are supported: - Software Trace Hub (STH), trace source, which is a System Trace - Module (STM) device, + Module (STM) device, - Memory Storage Unit (MSU), trace output, which allows storing - trace hub output in system memory, + trace hub output in system memory, - Parallel Trace Interface output (PTI), trace output to an external - debug host via a PTI port, + debug host via a PTI port, - Global Trace Hub (GTH), which is a switch and a central component - of Intel(R) Trace Hub architecture. + of Intel(R) Trace Hub architecture. Common attributes for output devices are described in Documentation/ABI/testing/sysfs-bus-intel_th-output-devices, the most @@ -65,41 +66,41 @@ allocated, are accessible via /dev/intel_th0/msc{0,1}. Quick example ------------- -# figure out which GTH port is the first memory controller: +# figure out which GTH port is the first memory controller:: -$ cat /sys/bus/intel_th/devices/0-msc0/port -0 + $ cat /sys/bus/intel_th/devices/0-msc0/port + 0 -# looks like it's port 0, configure master 33 to send data to port 0: +# looks like it's port 0, configure master 33 to send data to port 0:: -$ echo 0 > /sys/bus/intel_th/devices/0-gth/masters/33 + $ echo 0 > /sys/bus/intel_th/devices/0-gth/masters/33 # allocate a 2-windowed multiblock buffer on the first memory -# controller, each with 64 pages: +# controller, each with 64 pages:: -$ echo multi > /sys/bus/intel_th/devices/0-msc0/mode -$ echo 64,64 > /sys/bus/intel_th/devices/0-msc0/nr_pages + $ echo multi > /sys/bus/intel_th/devices/0-msc0/mode + $ echo 64,64 > /sys/bus/intel_th/devices/0-msc0/nr_pages -# enable wrapping for this controller, too: +# enable wrapping for this controller, too:: -$ echo 1 > /sys/bus/intel_th/devices/0-msc0/wrap + $ echo 1 > /sys/bus/intel_th/devices/0-msc0/wrap -# and enable tracing into this port: +# and enable tracing into this port:: -$ echo 1 > /sys/bus/intel_th/devices/0-msc0/active + $ echo 1 > /sys/bus/intel_th/devices/0-msc0/active # .. send data to master 33, see stm.txt for more details .. # .. wait for traces to pile up .. -# .. and stop the trace: +# .. and stop the trace:: -$ echo 0 > /sys/bus/intel_th/devices/0-msc0/active + $ echo 0 > /sys/bus/intel_th/devices/0-msc0/active -# and now you can collect the trace from the device node: +# and now you can collect the trace from the device node:: -$ cat /dev/intel_th0/msc0 > my_stp_trace + $ cat /dev/intel_th0/msc0 > my_stp_trace Host Debugger Mode -================== +------------------ It is possible to configure the Trace Hub and control its trace capture from a remote debug host, which should be connected via one of |