[Intel-gfx] [PATCH 1/2] drm/i915: Split late "for_each_ring" loop from i915_gem_init_hw()

[Dave Gordon]

This function has recently been updated by several patches, including:
    drm/i915: Add explicit request management to i915_gem_init_hw()
    drm/i915: Moved the for_each_ring loop outside of i915_gem_context_enable()

Now we need to move the entire loop into a separate function, replacing
the inline loop with a call. This will allow a future patch to add a
call from another locations (for now, there are no other calls).

The split marks the distinction between early initialisation using
MMIO register access to set up non-context registers, and late
initialisation using batchbuffers containing LRI instructions to
set up context-specific registers.

Signed-off-by: Dave Gordon <david.s.gordon at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |    1 +
 drivers/gpu/drm/i915/i915_gem.c |   15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ea9caf2..bc7c510 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2882,6 +2882,7 @@ bool i915_gem_clflush_object(struct drm_i915_gem_object *obj, bool force);
 int __must_check i915_gem_init(struct drm_device *dev);
 int i915_gem_init_rings(struct drm_device *dev);
 int __must_check i915_gem_init_hw(struct drm_device *dev);
+int i915_gem_init_hw_late(struct drm_device *dev);
 int i915_gem_l3_remap(struct drm_i915_gem_request *req, int slice);
 void i915_gem_init_swizzling(struct drm_device *dev);
 void i915_gem_cleanup_ringbuffer(struct drm_device *dev);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 52efe43..1887e60 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5073,6 +5073,20 @@ i915_gem_init_hw(struct drm_device *dev)
 			goto out;
 	}
 
+	ret = i915_gem_init_hw_late(dev);
+
+out:
+	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
+	return ret;
+}
+
+int
+i915_gem_init_hw_late(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_engine_cs *ring;
+	int ret, i, j;
+
 	/* Now it is safe to go back round and do everything else: */
 	for_each_ring(ring, dev_priv, i) {
 		struct drm_i915_gem_request *req;
@@ -5110,7 +5124,6 @@ i915_gem_init_hw(struct drm_device *dev)
 	}
 
 out:
-	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
 	return ret;
 }
 
-- 
1.7.9.5