From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
At least on my MGM the last 128KB of, what I assume is the stolen memory
region, contains the GTT entries. Let's assume that holds for all gen2
platforms.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/char/agp/intel-gtt.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 99ff699..35788a2 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -430,6 +430,10 @@ static unsigned int intel_gtt_stolen_size(bool *has_local_memory)
}
}
+ /* Assume GTT entries occupy the last 128KB of stolen/local memory. */
+ if (stolen_size > 0 && INTEL_GTT_GEN == 2)
+ stolen_size -= KB(128);
+
if (stolen_size > 0) {
dev_info(&intel_private.bridge_dev->dev, "detected %dK %s memory\n",
stolen_size / KB(1), *has_local_memory ? "local" : "stolen");
--
1.8.3.2
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