drm/i915/bdw: dispatch updates (64b related)

The command to emit batch buffers has changed to address 48b addresses.
It seemed reasonable that we could still use the old instruction where
emitting 0 for length would do the right thing, but it seems to bother
the simulator when the code does that.

Now the second dword in the command has the upper 16b of the address of
the batchbuffer.

v2: Remove duplicated vfun assignment.

v3: Squash in VECS support changes from Zhao Yakui <yakui.zhao@intel.com>

v4: Make checkpatch happy.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net> (v2)
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_reg.h

@@ -247,6 +247,7 @@
 #define   MI_BATCH_NON_SECURE_HSW 	(1<<13)
 #define MI_BATCH_BUFFER_START	MI_INSTR(0x31, 0)
 #define   MI_BATCH_GTT		    (2<<6) /* aliased with (1<<7) on gen4 */
+#define MI_BATCH_BUFFER_START_GEN8	MI_INSTR(0x31, 1)
 #define MI_SEMAPHORE_MBOX	MI_INSTR(0x16, 1) /* gen6+ */
 #define  MI_SEMAPHORE_GLOBAL_GTT    (1<<22)
 #define  MI_SEMAPHORE_UPDATE	    (1<<21)

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -1687,6 +1687,27 @@ static int gen6_bsd_ring_flush(struct intel_ring_buffer *ring,
 	return 0;
 }
 
+static int
+gen8_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,
+			      u32 offset, u32 len,
+			      unsigned flags)
+{
+	int ret;
+
+	ret = intel_ring_begin(ring, 4);
+	if (ret)
+		return ret;
+
+	/* FIXME(BDW): Address space and security selectors. */
+	intel_ring_emit(ring, MI_BATCH_BUFFER_START_GEN8);
+	intel_ring_emit(ring, offset);
+	intel_ring_emit(ring, 0);
+	intel_ring_emit(ring, MI_NOOP);
+	intel_ring_advance(ring);
+
+	return 0;
+}
+
 static int
 hsw_ring_dispatch_execbuffer(struct intel_ring_buffer *ring,
 			      u32 offset, u32 len,
@@ -1826,6 +1847,8 @@ int intel_init_render_ring_buffer(struct drm_device *dev)
 	ring->write_tail = ring_write_tail;
 	if (IS_HASWELL(dev))
 		ring->dispatch_execbuffer = hsw_ring_dispatch_execbuffer;
+	else if (IS_GEN8(dev))
+		ring->dispatch_execbuffer = gen8_ring_dispatch_execbuffer;
 	else if (INTEL_INFO(dev)->gen >= 6)
 		ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
 	else if (INTEL_INFO(dev)->gen >= 4)
@@ -1953,12 +1976,15 @@ int intel_init_bsd_ring_buffer(struct drm_device *dev)
 				GT_RENDER_USER_INTERRUPT << GEN8_VCS1_IRQ_SHIFT;
 			ring->irq_get = gen8_ring_get_irq;
 			ring->irq_put = gen8_ring_put_irq;
+			ring->dispatch_execbuffer =
+				gen8_ring_dispatch_execbuffer;
 		} else {
 			ring->irq_enable_mask = GT_BSD_USER_INTERRUPT;
 			ring->irq_get = gen6_ring_get_irq;
 			ring->irq_put = gen6_ring_put_irq;
+			ring->dispatch_execbuffer =
+				gen6_ring_dispatch_execbuffer;
 		}
-		ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
 		ring->sync_to = gen6_ring_sync;
 		ring->semaphore_register[RCS] = MI_SEMAPHORE_SYNC_VR;
 		ring->semaphore_register[VCS] = MI_SEMAPHORE_SYNC_INVALID;
@@ -2009,12 +2035,13 @@ int intel_init_blt_ring_buffer(struct drm_device *dev)
 			GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT;
 		ring->irq_get = gen8_ring_get_irq;
 		ring->irq_put = gen8_ring_put_irq;
+		ring->dispatch_execbuffer = gen8_ring_dispatch_execbuffer;
 	} else {
 		ring->irq_enable_mask = GT_BLT_USER_INTERRUPT;
 		ring->irq_get = gen6_ring_get_irq;
 		ring->irq_put = gen6_ring_put_irq;
+		ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
 	}
-	ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
 	ring->sync_to = gen6_ring_sync;
 	ring->semaphore_register[RCS] = MI_SEMAPHORE_SYNC_BR;
 	ring->semaphore_register[VCS] = MI_SEMAPHORE_SYNC_BV;
@@ -2043,7 +2070,6 @@ int intel_init_vebox_ring_buffer(struct drm_device *dev)
 	ring->add_request = gen6_add_request;
 	ring->get_seqno = gen6_ring_get_seqno;
 	ring->set_seqno = ring_set_seqno;
-	ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
 
 	if (INTEL_INFO(dev)->gen >= 8) {
 		ring->irq_enable_mask =
@@ -2051,10 +2077,12 @@ int intel_init_vebox_ring_buffer(struct drm_device *dev)
 			GT_RENDER_CS_MASTER_ERROR_INTERRUPT;
 		ring->irq_get = gen8_ring_get_irq;
 		ring->irq_put = gen8_ring_put_irq;
+		ring->dispatch_execbuffer = gen8_ring_dispatch_execbuffer;
 	} else {
 		ring->irq_enable_mask = PM_VEBOX_USER_INTERRUPT;
 		ring->irq_get = hsw_vebox_get_irq;
 		ring->irq_put = hsw_vebox_put_irq;
+		ring->dispatch_execbuffer = gen6_ring_dispatch_execbuffer;
 	}
 	ring->sync_to = gen6_ring_sync;
 	ring->semaphore_register[RCS] = MI_SEMAPHORE_SYNC_VER;