55 lines
2.2 KiB
Plaintext
55 lines
2.2 KiB
Plaintext
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What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/wrap
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Date: June 2015
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KernelVersion: 4.3
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Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
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Description: (RW) Configure MSC buffer wrapping. 1 == wrapping enabled.
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What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/mode
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Date: June 2015
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KernelVersion: 4.3
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Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
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Description: (RW) Configure MSC operating mode:
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- "single", for contiguous buffer mode (high-order alloc);
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- "multi", for multiblock mode;
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- "ExI", for DCI handler mode;
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- "debug", for debug mode;
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- any of the currently loaded buffer sinks.
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If operating mode changes, existing buffer is deallocated,
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provided there are no active users and tracing is not enabled,
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otherwise the write will fail.
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What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/nr_pages
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Date: June 2015
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KernelVersion: 4.3
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Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
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Description: (RW) Configure MSC buffer size for "single" or "multi" modes.
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In single mode, this is a single number of pages, has to be
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power of 2. In multiblock mode, this is a comma-separated list
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of numbers of pages for each window to be allocated. Number of
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windows is not limited.
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Writing to this file deallocates existing buffer (provided
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there are no active users and tracing is not enabled) and then
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allocates a new one.
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What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/win_switch
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Date: May 2019
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KernelVersion: 5.2
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Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
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Description: (RW) Trigger window switch for the MSC's buffer, in
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multi-window mode. In "multi" mode, accepts writes of "1", thereby
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triggering a window switch for the buffer. Returns an error in any
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other operating mode or attempts to write something other than "1".
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What: /sys/bus/intel_th/devices/<intel_th_id>-msc<msc-id>/stop_on_full
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Date: March 2020
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KernelVersion: 5.7
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Contact: Alexander Shishkin <alexander.shishkin@linux.intel.com>
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Description: (RW) Configure whether trace stops when the last available window
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becomes full (1/y/Y) or wraps around and continues until the next
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window becomes available again (0/n/N).
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