[Intel-gfx] [RFC 17/44] drm/i915: Prelude to splitting i915_gem_do_execbuffer in two

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

The scheduler decouples the submission of batch buffers to the driver with their
submission to the hardware. This basically means splitting the execbuffer()
function in half. This change rearranges some code ready for the split to occur.
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |   23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index ec274ef..fda9187 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -32,6 +32,7 @@
 #include "i915_trace.h"
 #include "intel_drv.h"
 #include <linux/dma_remapping.h>
+#include "i915_scheduler.h"
 
 #define  __EXEC_OBJECT_HAS_PIN (1<<31)
 #define  __EXEC_OBJECT_HAS_FENCE (1<<30)
@@ -874,10 +875,7 @@ i915_gem_execbuffer_move_to_gpu(struct intel_engine_cs *ring,
 	if (flush_domains & I915_GEM_DOMAIN_GTT)
 		wmb();
 
-	/* Unconditionally invalidate gpu caches and ensure that we do flush
-	 * any residual writes from the previous batch.
-	 */
-	return intel_ring_invalidate_all_caches(ring);
+	return 0;
 }
 
 static bool
@@ -1219,8 +1217,6 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 		}
 	}
 
-	intel_runtime_pm_get(dev_priv);
-
 	ret = i915_mutex_lock_interruptible(dev);
 	if (ret)
 		goto pre_mutex_err;
@@ -1331,6 +1327,20 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	if (ret)
 		goto err;
 
+	i915_gem_execbuffer_move_to_active(&eb->vmas, ring);
+
+	/* To be split into two functions here... */
+
+	intel_runtime_pm_get(dev_priv);
+
+	/* Unconditionally invalidate gpu caches and ensure that we do flush
+	 * any residual writes from the previous batch.
+	 */
+	ret = intel_ring_invalidate_all_caches(ring);
+	if (ret)
+		goto err;
+
+	/* Switch to the correct context for the batch */
 	ret = i915_switch_context(ring, ctx);
 	if (ret)
 		goto err;
@@ -1381,7 +1391,6 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 
 	trace_i915_gem_ring_dispatch(ring, intel_ring_get_seqno(ring), flags);
 
-	i915_gem_execbuffer_move_to_active(&eb->vmas, ring);
 	i915_gem_execbuffer_retire_commands(dev, file, ring, batch_obj);
 
 err:
-- 
1.7.9.5