This is revision 4 implementing a GPU crash state for drm/msm (https://patchwork.freedesktop.org/series/36097/). I think its mature enough to pull out of RFC status and think about merging.
The goal is to store and provide enough information to debug software and hardware issues on the Adreno hardware in a semi human-readable format that can also be parsed by scripts.
THe full set of changes here capture basic information about the GPU, the status and contents of the ringbuffers, a snapshot of the current register state and the active buffers from the hanging submit.
The data is printed with devcoredump. For example, after a hang you can get the data from /sys/class/devcoredump/devcdX/data where X is a unique number.
You can see an example of the output for a simple invalid opcode error on the db820c here: https://hastebin.com/yivozimoki.bash
v4: Add buffer dump for the active submit. Fix refcount issue with devcoredump. Change header for a5xx registers to registers-hlsq because I'm told YAML requires unique tags. v3: Make recommended changes to ascii85 per Chris Wilson. Use devcoredump to dump crash states as suggested by Bjorn Andersson and add a new drm_print facility to facilitate that. Remove the now obsolete 'crash' debugfs node. Add documentation for the crash dump output.
v2: Convert output to yaml, use ascii85 to dump ringbuffer contents.
Jordan Crouse (10): include: Move ascii85 functions from i915 to linux/ascii85.h drm: drm_printer: Add printer for devcoredump drm/msm/gpu: Capture the state of the GPU drm/msm/gpu: Convert the GPU show function to use the GPU state drm/msm/gpu: Rearrange the code that collects the task during a hang drm/msm/gpu: Capture the GPU state on a GPU hang drm/msm/adreno: Convert the show/crash file format drm/msm/adreno: Add ringbuffer data to the GPU state drm/msm/adreno: Add a5xx specific registers for the GPU state drm/msm/gpu: Add the buffer objects from the submit to the crash dump
Documentation/gpu/drm-msm-crash-dump.txt | 46 ++++++ drivers/gpu/drm/drm_print.c | 54 +++++++ drivers/gpu/drm/i915/i915_gpu_error.c | 35 +---- drivers/gpu/drm/msm/Kconfig | 1 + drivers/gpu/drm/msm/adreno/a3xx_gpu.c | 30 ++-- drivers/gpu/drm/msm/adreno/a4xx_gpu.c | 22 ++- drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 243 +++++++++++++++++++++++++++++-- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 181 ++++++++++++++++++++--- drivers/gpu/drm/msm/adreno/adreno_gpu.h | 7 +- drivers/gpu/drm/msm/msm_debugfs.c | 24 ++- drivers/gpu/drm/msm/msm_gpu.c | 143 ++++++++++++++++-- drivers/gpu/drm/msm/msm_gpu.h | 67 ++++++++- include/drm/drm_print.h | 27 ++++ include/linux/ascii85.h | 39 +++++ 14 files changed, 821 insertions(+), 98 deletions(-) create mode 100644 Documentation/gpu/drm-msm-crash-dump.txt create mode 100644 include/linux/ascii85.h