drm/i915: Rename helpers used for unwinding, use macro for can_preempt

We would also like to make use of execlist_cancel_port_requests and
unwind_incomplete_requests in GuC preemption backend.
Let's rename the functions to use the correct prefixes, so that we can
simply add the declarations in the following patch.
Similar thing for applies for can_preempt, except we're introducing
HAS_LOGICAL_RING_PREEMPTION macro instad, converting other users that
were previously touching device info directly.

v2: s/intel_engine/execlists and pass execlists to unwind (Chris)
v3: use locked version for exporting, drop const qual (Chris)

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20171025200020.16636-11-michal.winiarski@intel.com

1 files changed, 19 insertions, 16 deletions

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 599c709..b5d382e 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -354,7 +354,7 @@ static void unwind_wa_tail(struct drm_i915_gem_request *rq)
 	assert_ring_tail_valid(rq->ring, rq->tail);
 }
 
-static void unwind_incomplete_requests(struct intel_engine_cs *engine)
+static void __unwind_incomplete_requests(struct intel_engine_cs *engine)
 {
 	struct drm_i915_gem_request *rq, *rn;
 	struct i915_priolist *uninitialized_var(p);
@@ -385,6 +385,17 @@ static void unwind_incomplete_requests(struct intel_engine_cs *engine)
 	}
 }
 
+static void
+execlists_unwind_incomplete_requests(struct intel_engine_execlists *execlists)
+{
+	struct intel_engine_cs *engine =
+		container_of(execlists, typeof(*engine), execlists);
+
+	spin_lock_irq(&engine->timeline->lock);
+	__unwind_incomplete_requests(engine);
+	spin_unlock_irq(&engine->timeline->lock);
+}
+
 static inline void
 execlists_context_status_change(struct drm_i915_gem_request *rq,
 				unsigned long status)
@@ -515,11 +526,6 @@ static void inject_preempt_context(struct intel_engine_cs *engine)
 	elsp_write(ce->lrc_desc, elsp);
 }
 
-static bool can_preempt(struct intel_engine_cs *engine)
-{
-	return INTEL_INFO(engine->i915)->has_logical_ring_preemption;
-}
-
 static void execlists_dequeue(struct intel_engine_cs *engine)
 {
 	struct intel_engine_execlists * const execlists = &engine->execlists;
@@ -567,7 +573,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
 		if (port_count(&port[0]) > 1)
 			goto unlock;
 
-		if (can_preempt(engine) &&
+		if (HAS_LOGICAL_RING_PREEMPTION(engine->i915) &&
 		    rb_entry(rb, struct i915_priolist, node)->priority >
 		    max(last->priotree.priority, 0)) {
 			/*
@@ -691,7 +697,7 @@ unlock:
 }
 
 static void
-execlist_cancel_port_requests(struct intel_engine_execlists *execlists)
+execlists_cancel_port_requests(struct intel_engine_execlists * const execlists)
 {
 	struct execlist_port *port = execlists->port;
 	unsigned int num_ports = execlists_num_ports(execlists);
@@ -718,7 +724,7 @@ static void execlists_cancel_requests(struct intel_engine_cs *engine)
 	spin_lock_irqsave(&engine->timeline->lock, flags);
 
 	/* Cancel the requests on the HW and clear the ELSP tracker. */
-	execlist_cancel_port_requests(execlists);
+	execlists_cancel_port_requests(execlists);
 
 	/* Mark all executing requests as skipped. */
 	list_for_each_entry(rq, &engine->timeline->requests, link) {
@@ -858,11 +864,8 @@ static void intel_lrc_irq_handler(unsigned long data)
 
 			if (status & GEN8_CTX_STATUS_ACTIVE_IDLE &&
 			    buf[2*head + 1] == PREEMPT_ID) {
-				execlist_cancel_port_requests(execlists);
-
-				spin_lock_irq(&engine->timeline->lock);
-				unwind_incomplete_requests(engine);
-				spin_unlock_irq(&engine->timeline->lock);
+				execlists_cancel_port_requests(execlists);
+				execlists_unwind_incomplete_requests(execlists);
 
 				GEM_BUG_ON(!execlists_is_active(execlists,
 								EXECLISTS_ACTIVE_PREEMPT));
@@ -1531,10 +1534,10 @@ static void reset_common_ring(struct intel_engine_cs *engine,
 	 * guessing the missed context-switch events by looking at what
 	 * requests were completed.
 	 */
-	execlist_cancel_port_requests(execlists);
+	execlists_cancel_port_requests(execlists);
 
 	/* Push back any incomplete requests for replay after the reset. */
-	unwind_incomplete_requests(engine);
+	__unwind_incomplete_requests(engine);
 
 	spin_unlock_irqrestore(&engine->timeline->lock, flags);