[PATCH 5/6] drm/i915/gvt: Add helper for tuning MMIO hash table

[changbin.du at intel.com]

From: Changbin Du <changbin.du at intel.com>

We count all the tracked virtual MMIO registers, which can help us to
tune the MMIO hash table.

Signed-off-by: Changbin Du <changbin.du at intel.com>
---
 drivers/gpu/drm/i915/gvt/handlers.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index bc68752..8f1a727 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -47,6 +47,8 @@
 #define PCH_PP_OFF_DELAYS _MMIO(0xc720c)
 #define PCH_PP_DIVISOR _MMIO(0xc7210)
 
+static unsigned int num_tracked_mmio;
+
 unsigned long intel_gvt_get_device_type(struct intel_gvt *gvt)
 {
 	if (IS_BROADWELL(gvt->dev_priv))
@@ -124,6 +126,7 @@ static int new_mmio_info(struct intel_gvt *gvt,
 		gvt->mmio.mmio_attribute[info->offset / 4] = flags;
 		INIT_HLIST_NODE(&info->node);
 		hash_add(gvt->mmio.mmio_info_table, &info->node, info->offset);
+		num_tracked_mmio++;
 	}
 	return 0;
 }
@@ -2917,6 +2920,8 @@ int intel_gvt_setup_mmio_info(struct intel_gvt *gvt)
 		if (ret)
 			goto err;
 	}
+
+	gvt_dbg_mmio("traced %u virtual mmio registers\n", num_tracked_mmio);
 	return 0;
 err:
 	intel_gvt_clean_mmio_info(gvt);
-- 
2.7.4