drm/i915: Move legacy breadcrumb out of the reserved status page area

Addresses in the hardware status page below index 0x20 are reserved for use
by the hardware. The legacy breadcrumb was sitting at index 5. Move it to
index 0x21, and make sure everyone uses the defined value instead of
hard-coded constants.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

3 files changed, 8 insertions, 11 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 9d4278be0ca..0d215e38606 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -445,7 +445,7 @@ static void i915_emit_breadcrumb(struct drm_device *dev)
 
 	BEGIN_LP_RING(4);
 	OUT_RING(MI_STORE_DWORD_INDEX);
-	OUT_RING(5 << MI_STORE_DWORD_INDEX_SHIFT);
+	OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 	OUT_RING(dev_priv->counter);
 	OUT_RING(0);
 	ADVANCE_LP_RING();
@@ -576,7 +576,7 @@ static int i915_dispatch_flip(struct drm_device * dev)
 
 	BEGIN_LP_RING(4);
 	OUT_RING(MI_STORE_DWORD_INDEX);
-	OUT_RING(5 << MI_STORE_DWORD_INDEX_SHIFT);
+	OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 	OUT_RING(dev_priv->counter);
 	OUT_RING(0);
 	ADVANCE_LP_RING();
@@ -611,7 +611,6 @@ static int i915_batchbuffer(struct drm_device *dev, void *data,
 			    struct drm_file *file_priv)
 {
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
-	u32 *hw_status = dev_priv->hw_status_page;
 	drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
 	    dev_priv->sarea_priv;
 	drm_i915_batchbuffer_t *batch = data;
@@ -637,7 +636,7 @@ static int i915_batchbuffer(struct drm_device *dev, void *data,
 	mutex_unlock(&dev->struct_mutex);
 
 	if (sarea_priv)
-		sarea_priv->last_dispatch = (int)hw_status[5];
+		sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 	return ret;
 }
 
@@ -645,7 +644,6 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data,
 			  struct drm_file *file_priv)
 {
 	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
-	u32 *hw_status = dev_priv->hw_status_page;
 	drm_i915_sarea_t *sarea_priv = (drm_i915_sarea_t *)
 	    dev_priv->sarea_priv;
 	drm_i915_cmdbuffer_t *cmdbuf = data;
@@ -673,7 +671,7 @@ static int i915_cmdbuffer(struct drm_device *dev, void *data,
 	}
 
 	if (sarea_priv)
-		sarea_priv->last_dispatch = (int)hw_status[5];
+		sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 4afbadb1331..ef1c0b8f8d0 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -608,8 +608,9 @@ static inline void opregion_enable_asle(struct drm_device *dev) { return; }
  * The area from dword 0x20 to 0x3ff is available for driver usage.
  */
 #define READ_HWSP(dev_priv, reg)  (((volatile u32*)(dev_priv->hw_status_page))[reg])
-#define READ_BREADCRUMB(dev_priv) READ_HWSP(dev_priv, 5)
+#define READ_BREADCRUMB(dev_priv) READ_HWSP(dev_priv, I915_BREADCRUMB_INDEX)
 #define I915_GEM_HWS_INDEX		0x20
+#define I915_BREADCRUMB_INDEX		0x21
 
 extern int i915_wait_ring(struct drm_device * dev, int n, const char *caller);
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index a75345af62e..82752d6177a 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -212,12 +212,10 @@ static int i915_emit_irq(struct drm_device * dev)
 	if (dev_priv->sarea_priv)
 		dev_priv->sarea_priv->last_enqueue = dev_priv->counter;
 
-	BEGIN_LP_RING(6);
+	BEGIN_LP_RING(4);
 	OUT_RING(MI_STORE_DWORD_INDEX);
-	OUT_RING(5 << MI_STORE_DWORD_INDEX_SHIFT);
+	OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 	OUT_RING(dev_priv->counter);
-	OUT_RING(0);
-	OUT_RING(0);
 	OUT_RING(MI_USER_INTERRUPT);
 	ADVANCE_LP_RING();