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intel_th: msu: Make stopping the trace optional

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Some use cases prefer to keep collecting the trace data into the last
available window while the other windows are being offloaded instead of
stopping the trace. In this scenario, the window switch happens
automatically when the next window becomes available again.

Add an option to allow this and a sysfs attribute to enable it.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200319085152.52183-1-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin
2020-03-19 10:51:52 +02:00
committed by Greg Kroah-Hartman
parent 3baf89abca
commit 8622dfefb6
2 changed files with 45 additions and 1 deletions
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8
Documentation/ABI/testing/sysfs-bus-intel_th-devices-msc
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@@ -40,3 +40,11 @@ Description: (RW) Trigger window switch for the MSC's buffer, in
triggering a window switch for the buffer. Returns an error in any
other operating mode or attempts to write something other than "1".
What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/stop_on_full
Date: March 2020
KernelVersion: 5.7
Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Description: (RW) Configure whether trace stops when the last available window
becomes full (1/y/Y) or wraps around and continues until the next
window becomes available again (0/n/N).