intel/tools: add README file

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27594>

src/intel/tools/README.md

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+# aubinator_error_decode
+
+This tool allows decode an error state dump generated by the kernel
+driver.
+
+Make a copy of the error state file (i915) :
+```
+$ sudo cp /sys/devices/pci0000:00/0000:00:02.0/drm/card0/error /tmp/error
+$ sudo chmod go+rw /tmp/error
+```
+
+Make a copy of the error state file (Xe) :
+```
+$ sudo cp /sys/class/drm/card0/device/devcoredump/data /tmp/error
+$ sudo chmod go+rw /tmp/error
+```
+
+Then visualize the error state (from the mesa build directory) :
+```
+$ ./src/intel/tools/aubinator_error_decode /tmp/error
+```
+
+# intel_stub_gpu
+
+This tool allows faking a particular device at the ioctl level. This
+is useful to test compiler changes (using shader-db/fossils-db
+replays) across a number of device you don't necessarily have access
+too.
+
+Faking a DG2 device :
+```
+$ intel_stub_gpu -p dg2 fossilize-replay /path/to/fossilize.foz --enable-pipeline-stats /tmp/dg2.csv
+```
+
+Faking a ICL device :
+```
+$ intel_stub_gpu -p icl fossilize-replay /path/to/fossilize.foz --enable-pipeline-stats /tmp/icl.csv
+```
+
+# intel_error2hangdump
+
+This tool converts an error state dump into an
+uncompressed/easy-to-modify binary file (format described in
+`src/intel/common/intel_hang_dump.h`).
+
+Capture the error state (i915) :
+```
+$ sudo cp /sys/devices/pci0000:00/0000:00:02.0/drm/card0/error /tmp/error
+$ sudo chmod go+rw /tmp/error
+```
+Capture the error state (Xe) :
+```
+$ sudo cp /sys/class/drm/card0/device/devcoredump/data /tmp/error
+$ sudo chmod go+rw /tmp/error
+```
+
+Convert an error state (from the mesa build directory) :
+```
+$ ./src/intel/tools/intel_error2hang /tmp/error
+```
+
+A resulting `error.dmp` file will be created
+
+# intel_hang_replay
+
+This tool replays a binary file generated by `intel_error2hangdump`.
+
+From the mesa build directory :
+```
+$ ./src/intel/tools/intel_hang_replay -d /tmp/error.dmp
+```
+
+# intel_hang_viewer
+
+This tool is a editor/visualizer for the file generated by
+`intel_error2hangdump`. When replaying on simulation a few tweaks
+might be needed in order for the simulator to accept the input
+commands (this is due to divergences between the simulation & HW
+implementations).
+
+To visualize a file generated from a DG2 error state (from the mesa
+build directory) :
+```
+./src/intel/tools/intel_hang_viewer -p dg2 /tmp/error.dmp
+```
+
+To visualize and edit a file generated from a DG2 error state (from the mesa
+build directory) :
+```
+./src/intel/tools/intel_hang_viewer -e -p dg2 /tmp/error.dmp
+```