drm/i915: Discard some redundant cache domain flushes

Since commit a679f58 ("drm/i915: Flush pages on acquisition"), we
flush objects on acquire their pages and as such when we create an
object for the purpose of writing into it, we do not need to manually
flush.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.william.auld@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190614111053.25615-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c

@@ -209,12 +209,6 @@ gpu_fill_dw(struct i915_vma *vma, u64 offset, unsigned long count, u32 value)
 	i915_gem_object_flush_map(obj);
 	i915_gem_object_unpin_map(obj);
 
-	i915_gem_object_lock(obj);
-	err = i915_gem_object_set_to_gtt_domain(obj, false);
-	i915_gem_object_unlock(obj);
-	if (err)
-		goto err;
-
 	vma = i915_vma_instance(obj, vma->vm, NULL);
 	if (IS_ERR(vma)) {
 		err = PTR_ERR(vma);

drivers/gpu/drm/i915/gt/selftest_workarounds.c

@@ -368,12 +368,6 @@ static struct i915_vma *create_batch(struct i915_gem_context *ctx)
 	if (err)
 		goto err_obj;
 
-	i915_gem_object_lock(obj);
-	err = i915_gem_object_set_to_wc_domain(obj, true);
-	i915_gem_object_unlock(obj);
-	if (err)
-		goto err_obj;
-
 	return vma;
 
 err_obj:

drivers/gpu/drm/i915/intel_guc_log.c

@@ -344,29 +344,20 @@ static void capture_logs_work(struct work_struct *work)
 static int guc_log_map(struct intel_guc_log *log)
 {
 	void *vaddr;
-	int ret;
 
 	lockdep_assert_held(&log->relay.lock);
 
 	if (!log->vma)
 		return -ENODEV;
 
-	i915_gem_object_lock(log->vma->obj);
-	ret = i915_gem_object_set_to_wc_domain(log->vma->obj, true);
-	i915_gem_object_unlock(log->vma->obj);
-	if (ret)
-		return ret;
-
 	/*
 	 * Create a WC (Uncached for read) vmalloc mapping of log
 	 * buffer pages, so that we can directly get the data
 	 * (up-to-date) from memory.
 	 */
 	vaddr = i915_gem_object_pin_map(log->vma->obj, I915_MAP_WC);
-	if (IS_ERR(vaddr)) {
-		DRM_ERROR("Couldn't map log buffer pages %d\n", ret);
+	if (IS_ERR(vaddr))
 		return PTR_ERR(vaddr);
-	}
 
 	log->relay.buf_addr = vaddr;
 

drivers/gpu/drm/i915/intel_overlay.c

@@ -1377,12 +1377,6 @@ void intel_overlay_setup(struct drm_i915_private *dev_priv)
 	if (ret)
 		goto out_free;
 
-	i915_gem_object_lock(overlay->reg_bo);
-	ret = i915_gem_object_set_to_gtt_domain(overlay->reg_bo, true);
-	i915_gem_object_unlock(overlay->reg_bo);
-	if (ret)
-		goto out_reg_bo;
-
 	memset_io(overlay->regs, 0, sizeof(struct overlay_registers));
 	update_polyphase_filter(overlay->regs);
 	update_reg_attrs(overlay, overlay->regs);
@@ -1391,8 +1385,6 @@ void intel_overlay_setup(struct drm_i915_private *dev_priv)
 	DRM_INFO("Initialized overlay support.\n");
 	return;
 
-out_reg_bo:
-	i915_gem_object_put(overlay->reg_bo);
 out_free:
 	kfree(overlay);
 }