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| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2015-09-22 15:47:10 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 22:28:58 +0300 |
| commit | 7bd1d4093c2fa37d1ecab05da3c9d48ea2af2264 (patch) | |
| tree | 24400395a4d56de0499f61e423529769f46fd83f /Documentation/ABI/testing/sysfs-class-stm | |
| parent | 9b76968db6869666c9b30ea99894e9dd88a0ab13 (diff) | |
| download | linux-7bd1d4093c2fa37d1ecab05da3c9d48ea2af2264.tar.xz | |
stm class: Introduce an abstraction for System Trace Module devices
A System Trace Module (STM) is a device exporting data in System Trace
Protocol (STP) format as defined by MIPI STP standards. Examples of such
devices are Intel(R) Trace Hub and Coresight STM.
This abstraction provides a unified interface for software trace sources
to send their data over an STM device to a debug host. In order to do
that, such a trace source needs to be assigned a pair of master/channel
identifiers that all the data from this source will be tagged with. The
STP decoder on the debug host side will use these master/channel tags to
distinguish different trace streams from one another inside one STP
stream.
This abstraction provides a configfs-based policy management mechanism
for dynamic allocation of these master/channel pairs based on trace
source-supplied string identifier. It has the flexibility of being
defined at runtime and at the same time (provided that the policy
definition is aligned with the decoding end) consistency.
For userspace trace sources, this abstraction provides write()-based and
mmap()-based (if the underlying stm device allows this) output mechanism.
For kernel-side trace sources, we provide "stm_source" device class that
can be connected to an stm device at run time.
Cc: linux-api@vger.kernel.org
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-stm')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-stm | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-stm b/Documentation/ABI/testing/sysfs-class-stm new file mode 100644 index 000000000000..c9aa4f3fc9a7 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-stm @@ -0,0 +1,14 @@ +What: /sys/class/stm/<stm>/masters +Date: June 2015 +KernelVersion: 4.3 +Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com> +Description: + Shows first and last available to software master numbers on + this STM device. + +What: /sys/class/stm/<stm>/channels +Date: June 2015 +KernelVersion: 4.3 +Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com> +Description: + Shows the number of channels per master on this STM device. |