1 What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/wrap 2 Date: June 2015 3 KernelVersion: 4.3 4 Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com> 5 Description: (RW) Configure MSC buffer wrapping. 1 == wrapping enabled. 6 7 What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/mode 8 Date: June 2015 9 KernelVersion: 4.3 10 Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com> 11 Description: (RW) Configure MSC operating mode: 12 13 - "single", for contiguous buffer mode (high-order alloc); 14 - "multi", for multiblock mode; 15 - "ExI", for DCI handler mode; 16 - "debug", for debug mode; 17 - any of the currently loaded buffer sinks. 18 19 If operating mode changes, existing buffer is deallocated, 20 provided there are no active users and tracing is not enabled, 21 otherwise the write will fail. 22 23 What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/nr_pages 24 Date: June 2015 25 KernelVersion: 4.3 26 Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com> 27 Description: (RW) Configure MSC buffer size for "single" or "multi" modes. 28 29 In single mode, this is a single number of pages, has to be 30 power of 2. In multiblock mode, this is a comma-separated list 31 of numbers of pages for each window to be allocated. Number of 32 windows is not limited. 33 34 Writing to this file deallocates existing buffer (provided 35 there are no active users and tracing is not enabled) and then 36 allocates a new one. 37 38 What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/win_switch 39 Date: May 2019 40 KernelVersion: 5.2 41 Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com> 42 Description: (RW) Trigger window switch for the MSC's buffer, in 43 multi-window mode. In "multi" mode, accepts writes of "1", thereby 44 triggering a window switch for the buffer. Returns an error in any 45 other operating mode or attempts to write something other than "1". 46 47 What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/stop_on_full 48 Date: March 2020 49 KernelVersion: 5.7 50 Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com> 51 Description: (RW) Configure whether trace stops when the last available window 52 becomes full (1/y/Y) or wraps around and continues until the next 53 window becomes available again (0/n/N). 54
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