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| author | Chris Wilson <[email protected]> | 2020-07-09 23:45:04 +0100 |
|---|---|---|
| committer | Chris Wilson <[email protected]> | 2020-07-10 10:20:38 +0100 |
| commit | ed2690a9ca896882a124ee0bd4eaff9678ed1162 (patch) | |
| tree | 3386064df30f367949251d2c70646f6a6f5e2a5b /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | e43ff99c8deda85234e6233e0f4af6cb09566a37 (diff) | |
drm/i915/selftest: Check that GPR are restored across noa_wait
Perf implements a GPU delay (noa_wait) by looping until the CS timestamp
has passed a certain point. This use MI_MATH and the general purpose
registers of the user's context, and since it is clobbering the user
state it must carefully save and restore the user's data around the
noa_wait. We can verify this by loading some values in the GPR that we
know will be clobbered by the noa_wait, and then inspecting the GPR after
the noa_wait completes and confirming that they have been restored.
Signed-off-by: Chris Wilson <[email protected]>
Cc: Umesh Nerlige Ramappa <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Reviewed-by: Lionel Landwerlin <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
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