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authorJordan Crouse <jcrouse@codeaurora.org>2018-07-24 19:33:28 +0300
committerRob Clark <robdclark@gmail.com>2018-07-30 15:50:00 +0300
commitbcf1d9fa5d03c1e86733411b5dc3a76ba7d75e6e (patch)
tree7f93994fda36ff4174166b6d3b9e1ecc308b6ac8 /Documentation/gpu
parentc0fec7f562ec76404ef0f074a89113a703587f3d (diff)
downloadlinux-bcf1d9fa5d03c1e86733411b5dc3a76ba7d75e6e.tar.xz
drm/msm/adreno: Convert the show/crash file format
Convert the format of the 'show' debugfs file and the crash dump to a format resembling YAML. This should be easier to parse and be more flexible for future changes and expansions. v2: Use a standard .rst for the msm crashdump documentation Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org> Signed-off-by: Rob Clark <robdclark@gmail.com>
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diff --git a/Documentation/gpu/msm-crash-dump.rst b/Documentation/gpu/msm-crash-dump.rst
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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.
+
+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.