drm/i915: Use phys_addr_t for the address of stolen memory

Though we know the hw is limited to keeping stolen memory inside the
first 4GiB, it is clearer to the reader that we are handling physical
address if we use phys_addr_t to refer to the base of stolen memory.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170106152013.24684-2-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -1453,7 +1453,7 @@ struct i915_gem_mm {
 	struct work_struct free_work;
 
 	/** Usable portion of the GTT for GEM */
-	unsigned long stolen_base; /* limited to low memory (32-bit) */
+	phys_addr_t stolen_base; /* limited to low memory (32-bit) */
 
 	/** PPGTT used for aliasing the PPGTT with the GTT */
 	struct i915_hw_ppgtt *aliasing_ppgtt;

drivers/gpu/drm/i915/i915_gem_stolen.c

@@ -281,14 +281,13 @@ void i915_gem_cleanup_stolen(struct drm_device *dev)
 }
 
 static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
-				    unsigned long *base, unsigned long *size)
+				    phys_addr_t *base, unsigned long *size)
 {
 	struct i915_ggtt *ggtt = &dev_priv->ggtt;
 	uint32_t reg_val = I915_READ(IS_GM45(dev_priv) ?
 				     CTG_STOLEN_RESERVED :
 				     ELK_STOLEN_RESERVED);
-	unsigned long stolen_top = dev_priv->mm.stolen_base +
-				   ggtt->stolen_size;
+	phys_addr_t stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 
 	*base = (reg_val & G4X_STOLEN_RESERVED_ADDR2_MASK) << 16;
 
@@ -305,7 +304,7 @@ static void g4x_get_stolen_reserved(struct drm_i915_private *dev_priv,
 }
 
 static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
-				     unsigned long *base, unsigned long *size)
+				     phys_addr_t *base, unsigned long *size)
 {
 	uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 
@@ -331,7 +330,7 @@ static void gen6_get_stolen_reserved(struct drm_i915_private *dev_priv,
 }
 
 static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
-				     unsigned long *base, unsigned long *size)
+				     phys_addr_t *base, unsigned long *size)
 {
 	uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 
@@ -351,7 +350,7 @@ static void gen7_get_stolen_reserved(struct drm_i915_private *dev_priv,
 }
 
 static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
-				     unsigned long *base, unsigned long *size)
+				    phys_addr_t *base, unsigned long *size)
 {
 	uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
 
@@ -377,11 +376,11 @@ static void chv_get_stolen_reserved(struct drm_i915_private *dev_priv,
 }
 
 static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
-				    unsigned long *base, unsigned long *size)
+				    phys_addr_t *base, unsigned long *size)
 {
 	struct i915_ggtt *ggtt = &dev_priv->ggtt;
 	uint32_t reg_val = I915_READ(GEN6_STOLEN_RESERVED);
-	unsigned long stolen_top;
+	phys_addr_t stolen_top;
 
 	stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
 
@@ -400,8 +399,9 @@ static void bdw_get_stolen_reserved(struct drm_i915_private *dev_priv,
 int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 {
 	struct i915_ggtt *ggtt = &dev_priv->ggtt;
-	unsigned long reserved_total, reserved_base = 0, reserved_size;
-	unsigned long stolen_usable_start, stolen_top;
+	phys_addr_t reserved_base, stolen_top;
+	unsigned long reserved_total, reserved_size;
+	unsigned long stolen_usable_start;
 
 	mutex_init(&dev_priv->mm.stolen_lock);
 
@@ -420,6 +420,8 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 		return 0;
 
 	stolen_top = dev_priv->mm.stolen_base + ggtt->stolen_size;
+	reserved_base = 0;
+	reserved_size = 0;
 
 	switch (INTEL_INFO(dev_priv)->gen) {
 	case 2:
@@ -427,8 +429,8 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 		break;
 	case 4:
 		if (IS_G4X(dev_priv))
-			g4x_get_stolen_reserved(dev_priv, &reserved_base,
-						&reserved_size);
+			g4x_get_stolen_reserved(dev_priv,
+						&reserved_base, &reserved_size);
 		break;
 	case 5:
 		/* Assume the gen6 maximum for the older platforms. */
@@ -436,20 +438,20 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 		reserved_base = stolen_top - reserved_size;
 		break;
 	case 6:
-		gen6_get_stolen_reserved(dev_priv, &reserved_base,
-					 &reserved_size);
+		gen6_get_stolen_reserved(dev_priv,
+					 &reserved_base, &reserved_size);
 		break;
 	case 7:
-		gen7_get_stolen_reserved(dev_priv, &reserved_base,
-					 &reserved_size);
+		gen7_get_stolen_reserved(dev_priv,
+					 &reserved_base, &reserved_size);
 		break;
 	default:
 		if (IS_LP(dev_priv))
-			chv_get_stolen_reserved(dev_priv, &reserved_base,
-						&reserved_size);
+			chv_get_stolen_reserved(dev_priv,
+						&reserved_base, &reserved_size);
 		else
-			bdw_get_stolen_reserved(dev_priv, &reserved_base,
-						&reserved_size);
+			bdw_get_stolen_reserved(dev_priv,
+						&reserved_base, &reserved_size);
 		break;
 	}
 
@@ -462,9 +464,10 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 
 	if (reserved_base < dev_priv->mm.stolen_base ||
 	    reserved_base + reserved_size > stolen_top) {
-		DRM_DEBUG_KMS("Stolen reserved area [0x%08lx - 0x%08lx] outside stolen memory [0x%08lx - 0x%08lx]\n",
-			      reserved_base, reserved_base + reserved_size,
-			      dev_priv->mm.stolen_base, stolen_top);
+		phys_addr_t reserved_top = reserved_base + reserved_size;
+		DRM_DEBUG_KMS("Stolen reserved area [%pa - %pa] outside stolen memory [%pa - %pa]\n",
+			      &reserved_base, &reserved_top,
+			      &dev_priv->mm.stolen_base, &stolen_top);
 		return 0;
 	}