drm/i915: Rename obj->pin_display to obj->pin_global

In the next patch, we want to extend use of the global pin counter for
semi-permanent pinning of context/ring objects. Given that we plan to
extend the usage to encompass a disparate set of objects, we want a name
that reflects both and should entail less confusion.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171013202621.7276-2-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_debugfs.c

@@ -83,7 +83,7 @@ static char get_active_flag(struct drm_i915_gem_object *obj)
 
 static char get_pin_flag(struct drm_i915_gem_object *obj)
 {
-	return obj->pin_display ? 'p' : ' ';
+	return obj->pin_global ? 'p' : ' ';
 }
 
 static char get_tiling_flag(struct drm_i915_gem_object *obj)
@@ -180,8 +180,8 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
 			pin_count++;
 	}
 	seq_printf(m, " (pinned x %d)", pin_count);
-	if (obj->pin_display)
-		seq_printf(m, " (display)");
+	if (obj->pin_global)
+		seq_printf(m, " (global)");
 	list_for_each_entry(vma, &obj->vma_list, obj_link) {
 		if (!drm_mm_node_allocated(&vma->node))
 			continue;
@@ -481,7 +481,7 @@ static int i915_gem_object_info(struct seq_file *m, void *data)
 		size += obj->base.size;
 		++count;
 
-		if (obj->pin_display) {
+		if (obj->pin_global) {
 			dpy_size += obj->base.size;
 			++dpy_count;
 		}
@@ -512,7 +512,7 @@ static int i915_gem_object_info(struct seq_file *m, void *data)
 		   huge_count,
 		   stringify_page_sizes(page_sizes, buf, sizeof(buf)),
 		   huge_size);
-	seq_printf(m, "%u display objects (pinned), %llu bytes\n",
+	seq_printf(m, "%u display objects (globally pinned), %llu bytes\n",
 		   dpy_count, dpy_size);
 
 	seq_printf(m, "%llu [%llu] gtt total\n",
@@ -579,7 +579,7 @@ static int i915_gem_gtt_info(struct seq_file *m, void *data)
 
 	total_obj_size = total_gtt_size = count = 0;
 	list_for_each_entry(obj, &dev_priv->mm.bound_list, global_link) {
-		if (show_pin_display_only && !obj->pin_display)
+		if (show_pin_display_only && !obj->pin_global)
 			continue;
 
 		seq_puts(m, "   ");

drivers/gpu/drm/i915/i915_gem.c

@@ -56,7 +56,7 @@ static bool cpu_write_needs_clflush(struct drm_i915_gem_object *obj)
 	if (!(obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_WRITE))
 		return true;
 
-	return obj->pin_display;
+	return obj->pin_global; /* currently in use by HW, keep flushed */
 }
 
 static int
@@ -3493,7 +3493,7 @@ static void __i915_gem_object_flush_for_display(struct drm_i915_gem_object *obj)
 
 void i915_gem_object_flush_if_display(struct drm_i915_gem_object *obj)
 {
-	if (!READ_ONCE(obj->pin_display))
+	if (!READ_ONCE(obj->pin_global))
 		return;
 
 	mutex_lock(&obj->base.dev->struct_mutex);
@@ -3860,10 +3860,10 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 
 	lockdep_assert_held(&obj->base.dev->struct_mutex);
 
-	/* Mark the pin_display early so that we account for the
+	/* Mark the global pin early so that we account for the
 	 * display coherency whilst setting up the cache domains.
 	 */
-	obj->pin_display++;
+	obj->pin_global++;
 
 	/* The display engine is not coherent with the LLC cache on gen6.  As
 	 * a result, we make sure that the pinning that is about to occur is
@@ -3879,7 +3879,7 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 					      I915_CACHE_WT : I915_CACHE_NONE);
 	if (ret) {
 		vma = ERR_PTR(ret);
-		goto err_unpin_display;
+		goto err_unpin_global;
 	}
 
 	/* As the user may map the buffer once pinned in the display plane
@@ -3910,7 +3910,7 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 		vma = i915_gem_object_ggtt_pin(obj, view, 0, alignment, flags);
 	}
 	if (IS_ERR(vma))
-		goto err_unpin_display;
+		goto err_unpin_global;
 
 	vma->display_alignment = max_t(u64, vma->display_alignment, alignment);
 
@@ -3925,8 +3925,8 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 
 	return vma;
 
-err_unpin_display:
-	obj->pin_display--;
+err_unpin_global:
+	obj->pin_global--;
 	return vma;
 }
 
@@ -3935,10 +3935,10 @@ i915_gem_object_unpin_from_display_plane(struct i915_vma *vma)
 {
 	lockdep_assert_held(&vma->vm->i915->drm.struct_mutex);
 
-	if (WARN_ON(vma->obj->pin_display == 0))
+	if (WARN_ON(vma->obj->pin_global == 0))
 		return;
 
-	if (--vma->obj->pin_display == 0)
+	if (--vma->obj->pin_global == 0)
 		vma->display_alignment = I915_GTT_MIN_ALIGNMENT;
 
 	/* Bump the LRU to try and avoid premature eviction whilst flipping  */

drivers/gpu/drm/i915/i915_gem_object.h

@@ -161,7 +161,8 @@ struct drm_i915_gem_object {
 	/** Count of VMA actually bound by this object */
 	unsigned int bind_count;
 	unsigned int active_count;
-	unsigned int pin_display;
+	/** Count of how many global VMA are currently pinned for use by HW */
+	unsigned int pin_global;
 
 	struct {
 		struct mutex lock; /* protects the pages and their use */

drivers/gpu/drm/i915/i915_gem_userptr.c

@@ -83,10 +83,10 @@ static void cancel_userptr(struct work_struct *work)
 	if (i915_gem_object_unbind(obj) == 0)
 		__i915_gem_object_put_pages(obj, I915_MM_NORMAL);
 	WARN_ONCE(i915_gem_object_has_pages(obj),
-		  "Failed to release pages: bind_count=%d, pages_pin_count=%d, pin_display=%d\n",
+		  "Failed to release pages: bind_count=%d, pages_pin_count=%d, pin_global=%d\n",
 		  obj->bind_count,
 		  atomic_read(&obj->mm.pages_pin_count),
-		  obj->pin_display);
+		  obj->pin_global);
 
 	mutex_unlock(&obj->base.dev->struct_mutex);