drm/i915: Use i915_vma_pin_iomap on the ringbuffer object

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@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1461833819-3991-6-git-send-email-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 95f8d14..461ea71 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2095,20 +2095,23 @@ 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);
+       GEM_BUG_ON(ringbuf->virtual_start == NULL);
+
        if (HAS_LLC(ringbuf->obj->base.dev) && !ringbuf->obj->stolen)
                i915_gem_object_unpin_map(ringbuf->obj);
        else
-               iounmap(ringbuf->virtual_start);
+               i915_vma_unpin_iomap(ringbuf->vma);
        ringbuf->virtual_start = NULL;
-       ringbuf->vma = NULL;
+
        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;
@@ -2142,10 +2145,9 @@ 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);
 
-               addr = ioremap_wc(ggtt->mappable_base +
-                                 i915_gem_obj_ggtt_offset(obj), ringbuf->size);
-               if (addr == NULL) {
-                       ret = -ENOMEM;
+               addr = i915_vma_pin_iomap(i915_gem_obj_to_ggtt(obj));
+               if (IS_ERR(addr)) {
+                       ret = PTR_ERR(addr);
                        goto err_unpin;
                }
        }