[PATCH 05/91] drm/i915: Only skip requests once a context is banned

[Chris Wilson]

If we skip before banning, we have an inconsistent interface between
execbuf still queueing valid request but those requests already queued
being cancelled. If we only cancel the pending requests once we stop
accepting new requests, the interface is more consistent.

Reported-by: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Fixes: 821ed7df6e2a ("drm/i915: Update reset path to fix incomplete requests")
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 1fcce2db86f2..e7a7f404fd85 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2736,7 +2736,7 @@ void i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
 static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 {
 	struct drm_i915_gem_request *request;
-	struct i915_gem_context *incomplete_ctx;
+	struct i915_gem_context *hung_ctx;
 	struct intel_timeline *timeline;
 	unsigned long flags;
 	bool ring_hung;
@@ -2748,6 +2748,8 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 	if (!request)
 		return;
 
+	hung_ctx = request->ctx;
+
 	ring_hung = engine->hangcheck.stalled;
 	if (engine->hangcheck.seqno != intel_engine_get_seqno(engine)) {
 		DRM_DEBUG_DRIVER("%s pardoned, was guilty? %s\n",
@@ -2757,10 +2759,10 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 	}
 
 	if (ring_hung) {
-		i915_gem_context_mark_guilty(request->ctx);
+		i915_gem_context_mark_guilty(hung_ctx);
 		dma_fence_set_error(&request->fence, -EIO);
 	} else {
-		i915_gem_context_mark_innocent(request->ctx);
+		i915_gem_context_mark_innocent(hung_ctx);
 	}
 
 	if (!ring_hung)
@@ -2772,6 +2774,10 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 	/* Setup the CS to resume from the breadcrumb of the hung request */
 	engine->reset_hw(engine, request);
 
+	/* If this context is now banned, skip all of its pending requests. */
+	if (!i915_gem_context_is_banned(hung_ctx))
+		return;
+
 	/* Users of the default context do not rely on logical state
 	 * preserved between batches. They have to emit full state on
 	 * every batch and so it is safe to execute queued requests following
@@ -2780,17 +2786,16 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 	 * Other contexts preserve state, now corrupt. We want to skip all
 	 * queued requests that reference the corrupt context.
 	 */
-	incomplete_ctx = request->ctx;
-	if (i915_gem_context_is_default(incomplete_ctx))
+	if (i915_gem_context_is_default(hung_ctx))
 		return;
 
-	timeline = i915_gem_context_lookup_timeline(incomplete_ctx, engine);
+	timeline = i915_gem_context_lookup_timeline(hung_ctx, engine);
 
 	spin_lock_irqsave(&engine->timeline->lock, flags);
 	spin_lock(&timeline->lock);
 
 	list_for_each_entry_continue(request, &engine->timeline->requests, link)
-		if (request->ctx == incomplete_ctx)
+		if (request->ctx == hung_ctx)
 			reset_request(request);
 
 	list_for_each_entry(request, &timeline->requests, link)
-- 
2.11.0