drm/i915: Remove early l3-remap

Since we do the l3-remap on context switch, we can remove the redundant
early call to set the mapping prior to performing the first context
switch.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461833819-3991-10-git-send-email-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -3147,7 +3147,6 @@ 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_engines(struct drm_device *dev);
 int __must_check i915_gem_init_hw(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_engines(struct drm_device *dev);
 int __must_check i915_gpu_idle(struct drm_device *dev);

drivers/gpu/drm/i915/i915_gem.c

@@ -4842,7 +4842,7 @@ i915_gem_init_hw(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_engine_cs *engine;
-	int ret, j;
+	int ret;
 
 	if (INTEL_INFO(dev)->gen < 6 && !intel_enable_gtt())
 		return -EIO;
@@ -4924,14 +4924,6 @@ i915_gem_init_hw(struct drm_device *dev)
 			break;
 		}
 
-		if (engine->id == RCS) {
-			for (j = 0; j < NUM_L3_SLICES(dev); j++) {
-				ret = i915_gem_l3_remap(req, j);
-				if (ret)
-					goto err_request;
-			}
-		}
-
 		ret = i915_ppgtt_init_ring(req);
 		if (ret)
 			goto err_request;

drivers/gpu/drm/i915/i915_gem_context.c

@@ -601,7 +601,7 @@ mi_set_context(struct drm_i915_gem_request *req, u32 hw_flags)
 	return ret;
 }
 
-int i915_gem_l3_remap(struct drm_i915_gem_request *req, int slice)
+static int remap_l3(struct drm_i915_gem_request *req, int slice)
 {
 	u32 *remap_info = req->i915->l3_parity.remap_info[slice];
 	struct intel_engine_cs *engine = req->engine;
@@ -799,7 +799,7 @@ static int do_rcs_switch(struct drm_i915_gem_request *req)
 		if (!(to->remap_slice & (1<<i)))
 			continue;
 
-		ret = i915_gem_l3_remap(req, i);
+		ret = remap_l3(req, i);
 		if (ret)
 			return ret;