drm/i915: Refactor common ringbuffer allocation code

[deliverable/linux.git] / drivers / gpu / drm / i915 / intel_ringbuffer.c

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 6e6b8db996ef2450c615a71ef10b7ffcbbc62479..20a75bb516aca842d1dcbe7be1999d8cc2483f40 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1996,14 +1996,14 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
        return 0;
 }
 
-void intel_destroy_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
+static void intel_destroy_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
 {
        drm_gem_object_unreference(&ringbuf->obj->base);
        ringbuf->obj = NULL;
 }
 
-int intel_alloc_ringbuffer_obj(struct drm_device *dev,
-                              struct intel_ringbuffer *ringbuf)
+static int intel_alloc_ringbuffer_obj(struct drm_device *dev,
+                                     struct intel_ringbuffer *ringbuf)
 {
        struct drm_i915_gem_object *obj;
 
@@ -2023,6 +2023,48 @@ int intel_alloc_ringbuffer_obj(struct drm_device *dev,
        return 0;
 }
 
+struct intel_ringbuffer *
+intel_engine_create_ringbuffer(struct intel_engine_cs *engine, int size)
+{
+       struct intel_ringbuffer *ring;
+       int ret;
+
+       ring = kzalloc(sizeof(*ring), GFP_KERNEL);
+       if (ring == NULL)
+               return ERR_PTR(-ENOMEM);
+
+       ring->ring = engine;
+
+       ring->size = size;
+       /* Workaround an erratum on the i830 which causes a hang if
+        * the TAIL pointer points to within the last 2 cachelines
+        * of the buffer.
+        */
+       ring->effective_size = size;
+       if (IS_I830(engine->dev) || IS_845G(engine->dev))
+               ring->effective_size -= 2 * CACHELINE_BYTES;
+
+       ring->last_retired_head = -1;
+       intel_ring_update_space(ring);
+
+       ret = intel_alloc_ringbuffer_obj(engine->dev, ring);
+       if (ret) {
+               DRM_ERROR("Failed to allocate ringbuffer %s: %d\n",
+                         engine->name, ret);
+               kfree(ring);
+               return ERR_PTR(ret);
+       }
+
+       return ring;
+}
+
+void
+intel_ringbuffer_free(struct intel_ringbuffer *ring)
+{
+       intel_destroy_ringbuffer_obj(ring);
+       kfree(ring);
+}
+
 static int intel_init_ring_buffer(struct drm_device *dev,
                                  struct intel_engine_cs *ring)
 {
@@ -2031,22 +2073,20 @@ static int intel_init_ring_buffer(struct drm_device *dev,
 
        WARN_ON(ring->buffer);
 
-       ringbuf = kzalloc(sizeof(*ringbuf), GFP_KERNEL);
-       if (!ringbuf)
-               return -ENOMEM;
-       ring->buffer = ringbuf;
-
        ring->dev = dev;
        INIT_LIST_HEAD(&ring->active_list);
        INIT_LIST_HEAD(&ring->request_list);
        INIT_LIST_HEAD(&ring->execlist_queue);
        i915_gem_batch_pool_init(dev, &ring->batch_pool);
-       ringbuf->size = 32 * PAGE_SIZE;
-       ringbuf->ring = ring;
        memset(ring->semaphore.sync_seqno, 0, sizeof(ring->semaphore.sync_seqno));
 
        init_waitqueue_head(&ring->irq_queue);
 
+       ringbuf = intel_engine_create_ringbuffer(ring, 32 * PAGE_SIZE);
+       if (IS_ERR(ringbuf))
+               return PTR_ERR(ringbuf);
+       ring->buffer = ringbuf;
+
        if (I915_NEED_GFX_HWS(dev)) {
                ret = init_status_page(ring);
                if (ret)
@@ -2058,15 +2098,6 @@ static int intel_init_ring_buffer(struct drm_device *dev,
                        goto error;
        }
 
-       WARN_ON(ringbuf->obj);
-
-       ret = intel_alloc_ringbuffer_obj(dev, ringbuf);
-       if (ret) {
-               DRM_ERROR("Failed to allocate ringbuffer %s: %d\n",
-                               ring->name, ret);
-               goto error;
-       }
-
        ret = intel_pin_and_map_ringbuffer_obj(dev, ringbuf);
        if (ret) {
                DRM_ERROR("Failed to pin and map ringbuffer %s: %d\n",
@@ -2075,14 +2106,6 @@ static int intel_init_ring_buffer(struct drm_device *dev,
                goto error;
        }
 
-       /* Workaround an erratum on the i830 which causes a hang if
-        * the TAIL pointer points to within the last 2 cachelines
-        * of the buffer.
-        */
-       ringbuf->effective_size = ringbuf->size;
-       if (IS_I830(dev) || IS_845G(dev))
-               ringbuf->effective_size -= 2 * CACHELINE_BYTES;
-
        ret = i915_cmd_parser_init_ring(ring);
        if (ret)
                goto error;
@@ -2090,7 +2113,7 @@ static int intel_init_ring_buffer(struct drm_device *dev,
        return 0;
 
 error:
-       kfree(ringbuf);
+       intel_ringbuffer_free(ringbuf);
        ring->buffer = NULL;
        return ret;
 }
@@ -2098,19 +2121,18 @@ error:
 void intel_cleanup_ring_buffer(struct intel_engine_cs *ring)
 {
        struct drm_i915_private *dev_priv;
-       struct intel_ringbuffer *ringbuf;
 
        if (!intel_ring_initialized(ring))
                return;
 
        dev_priv = to_i915(ring->dev);
-       ringbuf = ring->buffer;
 
        intel_stop_ring_buffer(ring);
        WARN_ON(!IS_GEN2(ring->dev) && (I915_READ_MODE(ring) & MODE_IDLE) == 0);
 
-       intel_unpin_ringbuffer_obj(ringbuf);
-       intel_destroy_ringbuffer_obj(ringbuf);
+       intel_unpin_ringbuffer_obj(ring->buffer);
+       intel_ringbuffer_free(ring->buffer);
+       ring->buffer = NULL;
 
        if (ring->cleanup)
                ring->cleanup(ring);
@@ -2119,9 +2141,6 @@ void intel_cleanup_ring_buffer(struct intel_engine_cs *ring)
 
        i915_cmd_parser_fini_ring(ring);
        i915_gem_batch_pool_fini(&ring->batch_pool);
-
-       kfree(ringbuf);
-       ring->buffer = NULL;
 }
 
 static int ring_wait_for_space(struct intel_engine_cs *ring, int n)