drm/i915: add accounting for mappable objects in gtt v2

More precisely: For those that _need_ to be mappable. Also add two
BUG_ONs in fault and pin to check the consistency of the mappable
flag.

Changes in v2:
- Add tracking of gtt mappable space (to notice mappable/unmappable
  balancing issues).
- Improve the mappable working set tracking by tracking fault and pin
  separately.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 296ed38b292f..cdae5d189165 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -643,9 +643,13 @@ typedef struct drm_i915_private {
 		size_t object_memory;
 		size_t pin_memory;
 		size_t gtt_memory;
+		size_t gtt_mappable_memory;
+		size_t mappable_gtt_used;
+		size_t mappable_gtt_total;
 		size_t gtt_total;
 		u32 object_count;
 		u32 pin_count;
+		u32 gtt_mappable_count;
 		u32 gtt_count;
 	} mm;
 	struct sdvo_device_mapping sdvo_mappings[2];
@@ -775,6 +779,14 @@ struct drm_i915_gem_object {
 	unsigned int pin_count : 4;
 #define DRM_I915_GEM_OBJECT_MAX_PIN_COUNT 0xf
 
+	/**
+	 * Whether the current gtt mapping needs to be mappable (and isn't just
+	 * mappable by accident). Track pin and fault separate for a more
+	 * accurate mappable working set.
+	 */
+	unsigned int fault_mappable : 1;
+	unsigned int pin_mappable : 1;
+
 	/** AGP memory structure for our GTT binding. */
 	DRM_AGP_MEM *agp_mem;