drm/i915: Move map-and-fenceable tracking to the VMA

By moving map-and-fenceable tracking from the object to the VMA, we gain
fine-grained tracking and the ability to track individual fences on the VMA
(subsequent patch).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160818161718.27187-16-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.h

@@ -2192,12 +2192,6 @@ struct drm_i915_gem_object {
 	 */
 	unsigned int fence_dirty:1;
 
-	/**
-	 * Is the object at the current location in the gtt mappable and
-	 * fenceable? Used to avoid costly recalculations.
-	 */
-	unsigned int map_and_fenceable:1;
-
 	/**
 	 * Whether the current gtt mapping needs to be mappable (and isn't just
 	 * mappable by accident). Track pin and fault separate for a more

drivers/gpu/drm/i915/i915_gem.c

@@ -2899,8 +2899,7 @@ int i915_vma_unbind(struct i915_vma *vma)
 	GEM_BUG_ON(obj->bind_count == 0);
 	GEM_BUG_ON(!obj->pages);
 
-	if (i915_vma_is_ggtt(vma) &&
-	    vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
+	if (i915_vma_is_map_and_fenceable(vma)) {
 		i915_gem_object_finish_gtt(obj);
 
 		/* release the fence reg _after_ flushing */
@@ -2909,6 +2908,7 @@ int i915_vma_unbind(struct i915_vma *vma)
 			return ret;
 
 		__i915_vma_iounmap(vma);
+		vma->flags &= ~I915_VMA_CAN_FENCE;
 	}
 
 	if (likely(!vma->vm->closed)) {
@@ -2920,14 +2920,11 @@ int i915_vma_unbind(struct i915_vma *vma)
 	drm_mm_remove_node(&vma->node);
 	list_move_tail(&vma->vm_link, &vma->vm->unbound_list);
 
-	if (i915_vma_is_ggtt(vma)) {
-		if (vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) {
-			obj->map_and_fenceable = false;
-		} else if (vma->pages) {
+	if (vma->pages != obj->pages) {
+		GEM_BUG_ON(!vma->pages);
 		sg_free_table(vma->pages);
 		kfree(vma->pages);
 	}
-	}
 	vma->pages = NULL;
 
 	/* Since the unbound list is global, only move to that list if
@@ -3703,8 +3700,6 @@ i915_gem_ring_throttle(struct drm_device *dev, struct drm_file *file)
 static bool
 i915_vma_misplaced(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 {
-	struct drm_i915_gem_object *obj = vma->obj;
-
 	if (!drm_mm_node_allocated(&vma->node))
 		return false;
 
@@ -3714,7 +3709,7 @@ i915_vma_misplaced(struct i915_vma *vma, u64 size, u64 alignment, u64 flags)
 	if (alignment && vma->node.start & (alignment - 1))
 		return true;
 
-	if (flags & PIN_MAPPABLE && !obj->map_and_fenceable)
+	if (flags & PIN_MAPPABLE && !i915_vma_is_map_and_fenceable(vma))
 		return true;
 
 	if (flags & PIN_OFFSET_BIAS &&
@@ -3736,10 +3731,10 @@ void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 	u32 fence_size, fence_alignment;
 
 	fence_size = i915_gem_get_ggtt_size(dev_priv,
-					    obj->base.size,
+					    vma->size,
 					    i915_gem_object_get_tiling(obj));
 	fence_alignment = i915_gem_get_ggtt_alignment(dev_priv,
-						      obj->base.size,
+						      vma->size,
 						      i915_gem_object_get_tiling(obj),
 						      true);
 
@@ -3749,7 +3744,10 @@ void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
 	mappable = (vma->node.start + fence_size <=
 		    dev_priv->ggtt.mappable_end);
 
-	obj->map_and_fenceable = mappable && fenceable;
+	if (mappable && fenceable)
+		vma->flags |= I915_VMA_CAN_FENCE;
+	else
+		vma->flags &= ~I915_VMA_CAN_FENCE;
 }
 
 int __i915_vma_do_pin(struct i915_vma *vma,
@@ -3809,12 +3807,11 @@ i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
 
 		WARN(i915_vma_is_pinned(vma),
 		     "bo is already pinned in ggtt with incorrect alignment:"
-		     " offset=%08x, req.alignment=%llx, req.map_and_fenceable=%d,"
-		     " obj->map_and_fenceable=%d\n",
-		     i915_ggtt_offset(vma),
-		     alignment,
+		     " offset=%08x, req.alignment=%llx,"
+		     " req.map_and_fenceable=%d, vma->map_and_fenceable=%d\n",
+		     i915_ggtt_offset(vma), alignment,
 		     !!(flags & PIN_MAPPABLE),
-		     obj->map_and_fenceable);
+		     i915_vma_is_map_and_fenceable(vma));
 		ret = i915_vma_unbind(vma);
 		if (ret)
 			return ERR_PTR(ret);

drivers/gpu/drm/i915/i915_gem_execbuffer.c

@@ -857,7 +857,6 @@ static bool
 eb_vma_misplaced(struct i915_vma *vma)
 {
 	struct drm_i915_gem_exec_object2 *entry = vma->exec_entry;
-	struct drm_i915_gem_object *obj = vma->obj;
 
 	WARN_ON(entry->flags & __EXEC_OBJECT_NEEDS_MAP &&
 		!i915_vma_is_ggtt(vma));
@@ -878,7 +877,8 @@ eb_vma_misplaced(struct i915_vma *vma)
 		return true;
 
 	/* avoid costly ping-pong once a batch bo ended up non-mappable */
-	if (entry->flags & __EXEC_OBJECT_NEEDS_MAP && !obj->map_and_fenceable)
+	if (entry->flags & __EXEC_OBJECT_NEEDS_MAP &&
+	    !i915_vma_is_map_and_fenceable(vma))
 		return !only_mappable_for_reloc(entry->flags);
 
 	if ((entry->flags & EXEC_OBJECT_SUPPORTS_48B_ADDRESS) == 0 &&

drivers/gpu/drm/i915/i915_gem_fence.c

@@ -130,7 +130,9 @@ static void i915_write_fence_reg(struct drm_device *dev, int reg,
 		     !is_power_of_2(vma->node.size) ||
 		     (vma->node.start & (vma->node.size - 1)),
 		     "object 0x%08llx [fenceable? %d] not 1M or pot-size (0x%08llx) aligned\n",
-		     vma->node.start, obj->map_and_fenceable, vma->node.size);
+		     vma->node.start,
+		     i915_vma_is_map_and_fenceable(vma),
+		     vma->node.size);
 
 		if (tiling == I915_TILING_Y && HAS_128_BYTE_Y_TILING(dev))
 			tile_width = 128;
@@ -389,9 +391,6 @@ i915_gem_object_get_fence(struct drm_i915_gem_object *obj)
 			return 0;
 		}
 	} else if (enable) {
-		if (WARN_ON(!obj->map_and_fenceable))
-			return -EINVAL;
-
 		reg = i915_find_fence_reg(dev);
 		if (IS_ERR(reg))
 			return PTR_ERR(reg);

drivers/gpu/drm/i915/i915_gem_gtt.c

@@ -3671,7 +3671,7 @@ void __iomem *i915_vma_pin_iomap(struct i915_vma *vma)
 	assert_rpm_wakelock_held(to_i915(vma->vm->dev));
 
 	lockdep_assert_held(&vma->vm->dev->struct_mutex);
-	if (WARN_ON(!vma->obj->map_and_fenceable))
+	if (WARN_ON(!i915_vma_is_map_and_fenceable(vma)))
 		return IO_ERR_PTR(-ENODEV);
 
 	GEM_BUG_ON(!i915_vma_is_ggtt(vma));

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -198,7 +198,8 @@ struct i915_vma {
 #define I915_VMA_BIND_MASK (I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND | I915_VMA_PIN_OVERFLOW)
 
 #define I915_VMA_GGTT		BIT(8)
-#define I915_VMA_CLOSED BIT(9)
+#define I915_VMA_CAN_FENCE	BIT(9)
+#define I915_VMA_CLOSED		BIT(10)
 
 	unsigned int active;
 	struct i915_gem_active last_read[I915_NUM_ENGINES];
@@ -239,6 +240,11 @@ static inline bool i915_vma_is_ggtt(const struct i915_vma *vma)
 	return vma->flags & I915_VMA_GGTT;
 }
 
+static inline bool i915_vma_is_map_and_fenceable(const struct i915_vma *vma)
+{
+	return vma->flags & I915_VMA_CAN_FENCE;
+}
+
 static inline bool i915_vma_is_closed(const struct i915_vma *vma)
 {
 	return vma->flags & I915_VMA_CLOSED;

drivers/gpu/drm/i915/i915_gem_tiling.c

@@ -134,7 +134,7 @@ i915_gem_object_fence_prepare(struct drm_i915_gem_object *obj, int tiling_mode)
 	if (!vma)
 		return 0;
 
-	if (!obj->map_and_fenceable)
+	if (!i915_vma_is_map_and_fenceable(vma))
 		return 0;
 
 	if (IS_GEN3(dev_priv)) {
@@ -145,7 +145,7 @@ i915_gem_object_fence_prepare(struct drm_i915_gem_object *obj, int tiling_mode)
 			goto bad;
 	}
 
-	size = i915_gem_get_ggtt_size(dev_priv, obj->base.size, tiling_mode);
+	size = i915_gem_get_ggtt_size(dev_priv, vma->size, tiling_mode);
 	if (vma->node.size < size)
 		goto bad;
 

drivers/gpu/drm/i915/intel_display.c

@@ -2224,7 +2224,7 @@ intel_pin_and_fence_fb_obj(struct drm_framebuffer *fb, unsigned int rotation)
 	 * framebuffer compression.  For simplicity, we always install
 	 * a fence as the cost is not that onerous.
 	 */
-	if (view.type == I915_GGTT_VIEW_NORMAL) {
+	if (i915_vma_is_map_and_fenceable(vma)) {
 		ret = i915_gem_object_get_fence(obj);
 		if (ret == -EDEADLK) {
 			/*
@@ -2262,11 +2262,11 @@ void intel_unpin_fb_obj(struct drm_framebuffer *fb, unsigned int rotation)
 	WARN_ON(!mutex_is_locked(&obj->base.dev->struct_mutex));
 
 	intel_fill_fb_ggtt_view(&view, fb, rotation);
+	vma = i915_gem_object_to_ggtt(obj, &view);
 
-	if (view.type == I915_GGTT_VIEW_NORMAL)
+	if (i915_vma_is_map_and_fenceable(vma))
 		i915_gem_object_unpin_fence(obj);
 
-	vma = i915_gem_object_to_ggtt(obj, &view);
 	i915_gem_object_unpin_from_display_plane(vma);
 }