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Chris Wilson authored
Currently, we rely on inspecting the hangcheck state from within the i915_reset() routines to determine which engines were guilty of the hang. This is problematic for cases where we want to run i915_handle_error() and call i915_reset() independently of hangcheck. Instead of relying on the indirect parameter passing, turn it into an explicit parameter providing the set of stalled engines which then are treated as guilty until proven innocent. While we are removing the implicit stalled parameter, also make the reason into an explicit parameter to i915_reset(). We still need a back-channel for i915_handle_error() to hand over the task to the locked waiter, but let's keep that its own channel rather than incriminate another. This leaves stalled/seqno as being private to hangcheck, with no more nefarious snooping by reset, be it whole-device or per-engine. \o/ The only real issue now is that this makes it crystal clear that we don't actually do any testing of hangcheck per se in drv_selftest/live_hangcheck, merely of resets! Signed-off-by:
Chris Wilson <chris@chris-wilson.co.uk> Cc: Michel Thierry <michel.thierry@intel.com> Cc: Jeff McGee <jeff.mcgee@intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by:
Michel Thierry <michel.thierry@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180406220354.18911-2-chris@chris-wilson.co.uk
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