drm/i915: Introduce VECS: the 4th ring

The video enhancement command streamer is a new ring on HSW which does
what it sounds like it does. This patch provides the most minimal
inception of the ring.

In order to support a new ring, we need to bump the number. The patch
may look trivial to the untrained eye, but bumping the number of rings
is a bit scary. As such the patch is not terribly useful by itself, but
a pretty nice place to find issues during a bisection.

Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

2 files changed, 4 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 5df179127e8b..ead979a94105 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -915,6 +915,8 @@ void intel_ring_setup_status_page(struct intel_ring_buffer *ring)
                 case VCS:
                         mmio = BSD_HWS_PGA_GEN7;
                         break;
+                case VECS:
+                        BUG();
                 }
         } else if (IS_GEN6(ring->dev)) {
                 mmio = RING_HWS_PGA_GEN6(ring->mmio_base);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index f55d92eb6c2a..73619cb34631 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -47,8 +47,9 @@ struct  intel_ring_buffer {
                 RCS = 0x0,
                 VCS,
                 BCS,
+                VECS,
         } id;
-#define I915_NUM_RINGS 3
+#define I915_NUM_RINGS 4
         u32             mmio_base;
         void            __iomem *virtual_start;
         struct          drm_device *dev;