[Intel-gfx] [RFC 04/10] drm/i915: Use explicit flag to mark unreachable intel_context

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

I need to keep the GEM context around a bit longer so adding an explicit
flag for syncing execbuf with closed/abandonded contexts.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c    | 3 ++-
 drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 2 +-
 drivers/gpu/drm/i915/gt/intel_context_types.h  | 1 +
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 0f4150c8d7fe..c49cfec6d616 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -568,7 +568,8 @@ static void engines_idle_release(struct i915_gem_context *ctx,
 		int err = 0;
 
 		/* serialises with execbuf */
-		RCU_INIT_POINTER(ce->gem_context, NULL);
+		WRITE_ONCE(ce->closed, true);
+
 		if (!intel_context_pin_if_active(ce))
 			continue;
 
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 0893ce781a84..17dbe03f8e2e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -2547,7 +2547,7 @@ static void eb_request_add(struct i915_execbuffer *eb)
 	prev = __i915_request_commit(rq);
 
 	/* Check that the context wasn't destroyed before submission */
-	if (likely(rcu_access_pointer(eb->context->gem_context))) {
+	if (likely(!READ_ONCE(eb->context->closed))) {
 		attr = eb->gem_context->sched;
 
 		/*
diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h
index 0f3b68b95c56..bcefebcf6b88 100644
--- a/drivers/gpu/drm/i915/gt/intel_context_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
@@ -50,6 +50,7 @@ struct intel_context {
 
 	struct i915_address_space *vm;
 	struct i915_gem_context __rcu *gem_context;
+	bool closed;
 
 	struct list_head signal_link;
 	struct list_head signals;
-- 
2.20.1