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drm/i915/execlists: Process interrupted context on reset 

By stopping the rings, we may trigger an arbitration point resulting in
a premature context-switch (i.e. a completion event before the request
is actually complete). This clears the active context before the reset,
but we must remember to rewind the incomplete context for replay upon
resume.

Fixes: 1863e3020a ("drm/i915/execlists: Always reset the context's RING registers")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190716124931.5870-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-07-16 13:49:29 +01:00
parent 0629d4da1f
commit fff8102aae
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/i915/gt/intel_lrc.c
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@ -1425,7 +1425,8 @@ static void process_csb(struct intel_engine_cs *engine)
* coherent (visible from the CPU) before the
* user interrupt and CSB is processed.
*/
GEM_BUG_ON(!i915_request_completed(*execlists->active));
GEM_BUG_ON(!i915_request_completed(*execlists->active) &&
!reset_in_progress(execlists));
execlists_schedule_out(*execlists->active++);
GEM_BUG_ON(execlists->active - execlists->inflight >
@ -2251,7 +2252,7 @@ static void __execlists_reset(struct intel_engine_cs *engine, bool stalled)
*/
rq = execlists_active(execlists);
if (!rq)
return;
goto unwind;
ce = rq->hw_context;
GEM_BUG_ON(i915_active_is_idle(&ce->active));
@ -2328,6 +2329,7 @@ out_replay:
intel_ring_update_space(ce->ring);
__execlists_update_reg_state(ce, engine);
unwind:
/* Push back any incomplete requests for replay after the reset. */
__unwind_incomplete_requests(engine);
}