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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 formatted 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.
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