[Intel-gfx] [PATCH v2 2/2] drm/i915/scheduler: add gvt notification for guc

[Chuanxiao Dong]

GVT request needs a manual mmio load/restore. Before GuC submit
a request, send notification to gvt for mmio loading. And after
the GuC finished this GVT request, notify gvt again for mmio
restore. This follows the usage when using execlists submission.

Cc: xiao.zheng at intel.com
Cc: kevin.tian at intel.com
Cc: joonas.lahtinen at linux.intel.com
Cc: chris at chris-wilson.co.uk
Signed-off-by: Chuanxiao Dong <chuanxiao.dong at intel.com>
---
 drivers/gpu/drm/i915/i915_guc_submission.c |  4 ++++
 drivers/gpu/drm/i915/intel_gvt.h           | 12 ++++++++++++
 drivers/gpu/drm/i915/intel_lrc.c           | 21 +++------------------
 3 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 58087630..d8a5942 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -606,6 +606,8 @@ static void __i915_guc_submit(struct drm_i915_gem_request *rq)
 	unsigned long flags;
 	int b_ret;
 
+	intel_gvt_notify_context_status(rq, INTEL_CONTEXT_SCHEDULE_IN);
+
 	/* WA to flush out the pending GMADR writes to ring buffer. */
 	if (i915_vma_is_map_and_fenceable(rq->ring->vma))
 		POSTING_READ_FW(GUC_STATUS);
@@ -725,6 +727,8 @@ static void i915_guc_irq_handler(unsigned long data)
 		rq = port[0].request;
 		while (rq && i915_gem_request_completed(rq)) {
 			trace_i915_gem_request_out(rq);
+			intel_gvt_notify_context_status(rq,
+					INTEL_CONTEXT_SCHEDULE_OUT);
 			i915_gem_request_put(rq);
 			port[0].request = port[1].request;
 			port[1].request = NULL;
diff --git a/drivers/gpu/drm/i915/intel_gvt.h b/drivers/gpu/drm/i915/intel_gvt.h
index c0dcd66..813d0f8 100644
--- a/drivers/gpu/drm/i915/intel_gvt.h
+++ b/drivers/gpu/drm/i915/intel_gvt.h
@@ -38,6 +38,13 @@ intel_gvt_context_single_port_submit(const struct i915_gem_context *ctx)
 {
 	return i915_gem_context_force_single_submission(ctx);
 }
+static inline void
+intel_gvt_notify_context_status(struct drm_i915_gem_request *rq,
+				unsigned long status)
+{
+	atomic_notifier_call_chain(&rq->engine->context_status_notifier,
+				   status, rq);
+}
 #else
 static inline int intel_gvt_init(struct drm_i915_private *dev_priv)
 {
@@ -51,6 +58,11 @@ intel_gvt_context_single_port_submit(const struct i915_gem_context *ctx)
 {
 	return false;
 }
+static inline void
+intel_gvt_notify_context_status(struct drm_i915_gem_request *rq,
+				unsigned long status)
+{
+}
 #endif
 
 #endif /* _INTEL_GVT_H_ */
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 951540f..2333ffb 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -295,21 +295,6 @@ uint64_t intel_lr_context_descriptor(struct i915_gem_context *ctx,
 	return ctx->engine[engine->id].lrc_desc;
 }
 
-static inline void
-execlists_context_status_change(struct drm_i915_gem_request *rq,
-				unsigned long status)
-{
-	/*
-	 * Only used when GVT-g is enabled now. When GVT-g is disabled,
-	 * The compiler should eliminate this function as dead-code.
-	 */
-	if (!IS_ENABLED(CONFIG_DRM_I915_GVT))
-		return;
-
-	atomic_notifier_call_chain(&rq->engine->context_status_notifier,
-				   status, rq);
-}
-
 static void
 execlists_update_context_pdps(struct i915_hw_ppgtt *ppgtt, u32 *reg_state)
 {
@@ -350,7 +335,7 @@ static void execlists_submit_ports(struct intel_engine_cs *engine)
 
 	GEM_BUG_ON(port[0].count > 1);
 	if (!port[0].count)
-		execlists_context_status_change(port[0].request,
+		intel_gvt_notify_context_status(port[0].request,
 						INTEL_CONTEXT_SCHEDULE_IN);
 	desc[0] = execlists_update_context(port[0].request);
 	GEM_DEBUG_EXEC(port[0].context_id = upper_32_bits(desc[0]));
@@ -358,7 +343,7 @@ static void execlists_submit_ports(struct intel_engine_cs *engine)
 
 	if (port[1].request) {
 		GEM_BUG_ON(port[1].count);
-		execlists_context_status_change(port[1].request,
+		intel_gvt_notify_context_status(port[1].request,
 						INTEL_CONTEXT_SCHEDULE_IN);
 		desc[1] = execlists_update_context(port[1].request);
 		GEM_DEBUG_EXEC(port[1].context_id = upper_32_bits(desc[1]));
@@ -574,7 +559,7 @@ static void intel_lrc_irq_handler(unsigned long data)
 			if (--port[0].count == 0) {
 				GEM_BUG_ON(status & GEN8_CTX_STATUS_PREEMPTED);
 				GEM_BUG_ON(!i915_gem_request_completed(port[0].request));
-				execlists_context_status_change(port[0].request,
+				intel_gvt_notify_context_status(port[0].request,
 								INTEL_CONTEXT_SCHEDULE_OUT);
 
 				trace_i915_gem_request_out(port[0].request);
-- 
2.7.4