[PATCH 05/17] drm/i915: Use i915_vma_pin_iomap on the ringbuffer object

[Chris Wilson]

Similarly to i915_gem_object_pin_map on LLC platforms, we can
use the new VMA based io mapping on !LLC to amoritize the cost
of ringbuffer pinning and unpinning.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 0d24494904ef..01c281b1f0c6 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2083,19 +2083,21 @@ static int init_phys_status_page(struct intel_engine_cs *engine)
 
 void intel_unpin_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
 {
+	GEM_BUG_ON(ringbuf->vma == NULL);
+
 	if (HAS_LLC(ringbuf->obj->base.dev) && !ringbuf->obj->stolen)
 		i915_gem_object_unpin_map(ringbuf->obj);
 	else
-		iounmap(ringbuf->virtual_start);
-	ringbuf->vma = NULL;
+		i915_vma_unpin_iomap(ringbuf->vma);
+
 	i915_gem_object_ggtt_unpin(ringbuf->obj);
+	ringbuf->vma = NULL;
 }
 
 int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
 				     struct intel_ringbuffer *ringbuf)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
 	struct drm_i915_gem_object *obj = ringbuf->obj;
 	/* Ring wraparound at offset 0 sometimes hangs. No idea why. */
 	unsigned flags = PIN_OFFSET_BIAS | 4096;
@@ -2116,6 +2118,8 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
 			goto err_unpin;
 		}
 	} else {
+		void __iomem *vaddr;
+
 		ret = i915_gem_obj_ggtt_pin(obj, PAGE_SIZE,
 					    flags | PIN_MAPPABLE);
 		if (ret)
@@ -2128,12 +2132,12 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
 		/* Access through the GTT requires the device to be awake. */
 		assert_rpm_wakelock_held(dev_priv);
 
-		ringbuf->virtual_start = ioremap_wc(ggtt->mappable_base +
-						    i915_gem_obj_ggtt_offset(obj), ringbuf->size);
-		if (ringbuf->virtual_start == NULL) {
-			ret = -ENOMEM;
+		vaddr = i915_vma_pin_iomap(i915_gem_obj_to_ggtt(obj));
+		if (IS_ERR(vaddr)) {
+			ret = PTR_ERR(vaddr);
 			goto err_unpin;
 		}
+		ringbuf->virtual_start = vaddr;
 	}
 
 	ringbuf->vma = i915_gem_obj_to_ggtt(obj);
-- 
2.8.0.rc3