If we cannot trust the reset will flush out the CS event queue such that
process_csb() reports an accurate view of HW, we will need to search the
active and pending contexts to determine which was actually running at
the time we issued the reset.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_engine_types.h | 5 +++++
drivers/gpu/drm/i915/gt/intel_lrc.c | 4 +++-
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index 80cdde712842..4804587442e7 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -166,6 +166,11 @@ struct intel_engine_execlists {
*/
u32 error_interrupt;
+ /**
+ * @reset_ccid: Active CCID [EXECLISTS_STATUS_HI] at the time of reset
+ */
+ u32 reset_ccid;
+
/**
* @no_priolist: priority lists disabled
*/
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 97ed8275659a..744737e57d1d 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -3710,6 +3710,8 @@ static void execlists_reset_prepare(struct intel_engine_cs *engine)
*/
ring_set_paused(engine, 1);
intel_engine_stop_cs(engine);
+
+ engine->execlists.reset_ccid = active_ccid(engine);
}
static void reset_csb_pointers(struct intel_engine_cs *engine)
@@ -3784,7 +3786,7 @@ static void __execlists_reset(struct intel_engine_cs *engine, bool stalled)
* its request, it was still running at the time of the
* reset and will have been clobbered.
*/
- rq = execlists_active(execlists);
+ rq = active_context(engine, engine->execlists.reset_ccid);
if (!rq)
goto unwind;
--
2.20.1
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