drm/i915: Update flush_all_caches() to take request structures

Updated the *_ring_flush_all_caches() functions to take requests instead of
rings or ringbuf/context pairs.

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Tomas Elf <tomas.elf@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 49869fe..48ca73e 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -715,7 +715,7 @@
 		return 0;
 
 	ring->gpu_caches_dirty = true;
-	ret = intel_ring_flush_all_caches(ring);
+	ret = intel_ring_flush_all_caches(req);
 	if (ret)
 		return ret;
 
@@ -733,7 +733,7 @@
 	intel_ring_advance(ring);
 
 	ring->gpu_caches_dirty = true;
-	ret = intel_ring_flush_all_caches(ring);
+	ret = intel_ring_flush_all_caches(req);
 	if (ret)
 		return ret;
 
@@ -2892,8 +2892,9 @@
 }
 
 int
-intel_ring_flush_all_caches(struct intel_engine_cs *ring)
+intel_ring_flush_all_caches(struct drm_i915_gem_request *req)
 {
+	struct intel_engine_cs *ring = req->ring;
 	int ret;
 
 	if (!ring->gpu_caches_dirty)