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Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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99 lines
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=====================
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MSM Crash Dump Format
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=====================
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Following a GPU hang the MSM driver outputs debugging information via
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/sys/kernel/dri/X/show or via devcoredump (/sys/class/devcoredump/dcdX/data).
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This document describes how the output is formatted.
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Each entry is in the form key: value. Sections headers will not have a value
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and all the contents of a section will be indented two spaces from the header.
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Each section might have multiple array entries the start of which is designated
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by a (-).
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Mappings
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--------
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kernel
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The kernel version that generated the dump (UTS_RELEASE).
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module
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The module that generated the crashdump.
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time
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The kernel time at crash formated as seconds.microseconds.
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comm
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Comm string for the binary that generated the fault.
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cmdline
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Command line for the binary that generated the fault.
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revision
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ID of the GPU that generated the crash formatted as
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core.major.minor.patchlevel separated by dots.
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rbbm-status
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The current value of RBBM_STATUS which shows what top level GPU
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components are in use at the time of crash.
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ringbuffer
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Section containing the contents of each ringbuffer. Each ringbuffer is
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identified with an id number.
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id
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Ringbuffer ID (0 based index). Each ringbuffer in the section
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will have its own unique id.
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iova
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GPU address of the ringbuffer.
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last-fence
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The last fence that was issued on the ringbuffer
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retired-fence
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The last fence retired on the ringbuffer.
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rptr
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The current read pointer (rptr) for the ringbuffer.
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wptr
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The current write pointer (wptr) for the ringbuffer.
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size
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Maximum size of the ringbuffer programmed in the hardware.
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data
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The contents of the ring encoded as ascii85. Only the used
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portions of the ring will be printed.
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bo
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List of buffers from the hanging submission if available.
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Each buffer object will have a uinque iova.
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iova
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GPU address of the buffer object.
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size
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Allocated size of the buffer object.
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data
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The contents of the buffer object encoded with ascii85. Only
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Trailing zeros at the end of the buffer will be skipped.
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registers
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Set of registers values. Each entry is on its own line enclosed
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by brackets { }.
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offset
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Byte offset of the register from the start of the
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GPU memory region.
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value
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Hexadecimal value of the register.
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registers-hlsq
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(5xx only) Register values from the HLSQ aperture.
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Same format as the register section.
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