drm/i915: Extract ringbuffer destroy & generalize alloc to take a ringbuf

More prep work: with Execlists, we are going to start creating a lot
of extra ringbuffers soon, so these functions are handy.

No functional changes.

v2: rename allocate/destroy_ring_buffer to alloc/destroy_ringbuffer_obj
because the name is more meaningful and to mirror a similar function in
the context world: i915_gem_alloc_context_obj(). Change suggested by Brad
Volkin.

Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 16 insertions, 10 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index e18ed05dc0d5..40b17f246a69 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1482,15 +1482,25 @@ static int init_phys_status_page(struct intel_engine_cs *ring)
         return 0;
 }
 
-static int allocate_ring_buffer(struct intel_engine_cs *ring)
+static void intel_destroy_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
+{
+        if (!ringbuf->obj)
+                return;
+
+        iounmap(ringbuf->virtual_start);
+        i915_gem_object_ggtt_unpin(ringbuf->obj);
+        drm_gem_object_unreference(&ringbuf->obj->base);
+        ringbuf->obj = NULL;
+}
+
+static int intel_alloc_ringbuffer_obj(struct drm_device *dev,
+                                      struct intel_ringbuffer *ringbuf)
 {
-        struct drm_device *dev = ring->dev;
         struct drm_i915_private *dev_priv = to_i915(dev);
-        struct intel_ringbuffer *ringbuf = ring->buffer;
         struct drm_i915_gem_object *obj;
         int ret;
 
-        if (intel_ring_initialized(ring))
+        if (ringbuf->obj)
                 return 0;
 
         obj = NULL;
@@ -1562,7 +1572,7 @@ static int intel_init_ring_buffer(struct drm_device *dev,
                         goto error;
         }
 
-        ret = allocate_ring_buffer(ring);
+        ret = intel_alloc_ringbuffer_obj(dev, ringbuf);
         if (ret) {
                 DRM_ERROR("Failed to allocate ringbuffer %s: %d\n", ring->name, ret);
                 goto error;
@@ -1603,11 +1613,7 @@ void intel_cleanup_ring_buffer(struct intel_engine_cs *ring)
         intel_stop_ring_buffer(ring);
         WARN_ON(!IS_GEN2(ring->dev) && (I915_READ_MODE(ring) & MODE_IDLE) == 0);
 
-        iounmap(ringbuf->virtual_start);
-
-        i915_gem_object_ggtt_unpin(ringbuf->obj);
-        drm_gem_object_unreference(&ringbuf->obj->base);
-        ringbuf->obj = NULL;
+        intel_destroy_ringbuffer_obj(ringbuf);
         ring->preallocated_lazy_request = NULL;
         ring->outstanding_lazy_seqno = 0;