[PATCH 1/5] drm/i915: Remove stale asserts from i915_gem_find_active_request()

[Chris Wilson]

Since we use i915_gem_find_active_request() from inside
intel_engine_dump() and may call that at any time, we do not guarantee
that the engine is paused nor that the signal kthreads and irq handler
are suspended, so we cannot assert that the breadcrumb doesn't advance
and that the irq hasn't happened on another CPU signaling the request we
believe to be idle.

Fixes: f636edb214a5 ("drm/i915: Make i915_engine_info pretty printer to standalone")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 05f44ca35a06..530d6d0109b4 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2972,23 +2972,22 @@ i915_gem_find_active_request(struct intel_engine_cs *engine)
 	struct i915_request *request, *active = NULL;
 	unsigned long flags;
 
-	/* We are called by the error capture and reset at a random
-	 * point in time. In particular, note that neither is crucially
-	 * ordered with an interrupt. After a hang, the GPU is dead and we
-	 * assume that no more writes can happen (we waited long enough for
-	 * all writes that were in transaction to be flushed) - adding an
+	/*
+	 * We are called by the error capture, reset and to dump engine
+	 * state at random points in time. In particular, note that neither is
+	 * crucially ordered with an interrupt. After a hang, the GPU is dead
+	 * and we assume that no more writes can happen (we waited long enough
+	 * for all writes that were in transaction to be flushed) - adding an
 	 * extra delay for a recent interrupt is pointless. Hence, we do
 	 * not need an engine->irq_seqno_barrier() before the seqno reads.
+	 * At all other times, we must assume the GPU is still running, but
+	 * we only care about the snapshot of this moment.
 	 */
 	spin_lock_irqsave(&engine->timeline.lock, flags);
 	list_for_each_entry(request, &engine->timeline.requests, link) {
 		if (__i915_request_completed(request, request->global_seqno))
 			continue;
 
-		GEM_BUG_ON(request->engine != engine);
-		GEM_BUG_ON(test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
-				    &request->fence.flags));
-
 		active = request;
 		break;
 	}
-- 
2.17.0