Documentation / gpu / msm-crash-dump.rst


Based on kernel version 5.17. Page generated on 2022-03-28 08:42 EST.

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=====================
MSM Crash Dump Format
=====================

Following a GPU hang the MSM driver outputs debugging information via
/sys/kernel/dri/X/show or via devcoredump (/sys/class/devcoredump/dcdX/data).
This document describes how the output is formatted.

Each entry is in the form key: value. Sections headers will not have a value
and all the contents of a section will be indented two spaces from the header.
Each section might have multiple array entries the start of which is designated
by a (-).

Mappings
--------

kernel
	The kernel version that generated the dump (UTS_RELEASE).

module
	The module that generated the crashdump.

time
	The kernel time at crash formated as seconds.microseconds.

comm
	Comm string for the binary that generated the fault.

cmdline
	Command line for the binary that generated the fault.

revision
	ID of the GPU that generated the crash formatted as
	core.major.minor.patchlevel separated by dots.

rbbm-status
	The current value of RBBM_STATUS which shows what top level GPU
	components are in use at the time of crash.

ringbuffer
	Section containing the contents of each ringbuffer. Each ringbuffer is
	identified with an id number.

	id
		Ringbuffer ID (0 based index).  Each ringbuffer in the section
		will have its own unique id.
	iova
		GPU address of the ringbuffer.

	last-fence
		The last fence that was issued on the ringbuffer

	retired-fence
		The last fence retired on the ringbuffer.

	rptr
		The current read pointer (rptr) for the ringbuffer.

	wptr
		The current write pointer (wptr) for the ringbuffer.

	size
		Maximum size of the ringbuffer programmed in the hardware.

	data
		The contents of the ring encoded as ascii85.  Only the used
		portions of the ring will be printed.

bo
	List of buffers from the hanging submission if available.
	Each buffer object will have a uinque iova.

	iova
		GPU address of the buffer object.

	size
		Allocated size of the buffer object.

	data
		The contents of the buffer object encoded with ascii85.  Only
		Trailing zeros at the end of the buffer will be skipped.

registers
	Set of registers values. Each entry is on its own line enclosed
	by brackets { }.

	offset
		Byte offset of the register from the start of the
		GPU memory region.

	value
		Hexadecimal value of the register.

registers-hlsq
		(5xx only) Register values from the HLSQ aperture.
		Same format as the register section.