drm/agp/i915: trim stolen space to 32M

Commit Message

Jesse Barnes July 8, 2010, 4:22 p.m. UTC

None

Patch

diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index f97122a..a61a87c 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -25,6 +25,10 @@ 
 #define USE_PCI_DMA_API 1
 #endif
 
+/* Max amount of stolen space, anything above will be returned to Linux */
+int intel_max_stolen = 32 * 1024 * 1024;
+EXPORT_SYMBOL(intel_max_stolen);
+
 static const struct aper_size_info_fixed intel_i810_sizes[] =
 {
 	{64, 16384, 4},
@@ -710,7 +714,12 @@  static void intel_i830_init_gtt_entries(void)
 			break;
 		}
 	}
-	if (gtt_entries > 0) {
+	if (!local && gtt_entries > intel_max_stolen) {
+		dev_info(&agp_bridge->dev->dev,
+			 "detected %dK stolen memory, trimming to %dK\n",
+			 gtt_entries / KB(1), intel_max_stolen / KB(1));
+		gtt_entries = intel_max_stolen / KB(4);
+	} else if (gtt_entries > 0) {
 		dev_info(&agp_bridge->dev->dev, "detected %dK %s memory\n",
 		       gtt_entries / KB(1), local ? "local" : "stolen");
 		gtt_entries /= KB(4);
diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index e2dd903..69e25ab 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -40,6 +40,8 @@ 
 #include <linux/vga_switcheroo.h>
 #include <linux/slab.h>
 
+extern int intel_max_stolen; /* from AGP driver */
+
 /**
  * Sets up the hardware status page for devices that need a physical address
  * in the register.
@@ -2105,6 +2107,12 @@  int i915_driver_load(struct drm_device *dev, unsigned long flags)
 	if (ret)
 		goto out_iomapfree;
 
+	if (prealloc_size > intel_max_stolen) {
+		DRM_INFO("detected %dM stolen memory, trimming to %dM\n",
+			 prealloc_size >> 20, intel_max_stolen >> 20);
+		prealloc_size = intel_max_stolen;
+	}
+
 	dev_priv->wq = create_singlethread_workqueue("i915");
 	if (dev_priv->wq == NULL) {
 		DRM_ERROR("Failed to create our workqueue.\n");