agp/intel-agp: Clear entire GTT on startup

Some BIOSes fail to initialise the GTT, which will cause DMA faults when
the IOMMU is enabled. We need to clear the whole thing to point at the
scratch page, not just the part that Linux is going to use.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
[anholt: Note that this may also help with stability in the presence of
driver bugs, by not drawing to memory we don't own]
Signed-off-by: Eric Anholt <eric@anholt.net>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index 37cb4e2b2328..33b4853b1353 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -176,6 +176,7 @@ static struct _intel_private {
          * popup and for the GTT.
          */
         int gtt_entries;                        /* i830+ */
+        int gtt_total_size;
         union {
                 void __iomem *i9xx_flush_page;
                 void *i8xx_flush_page;
@@ -1151,7 +1152,7 @@ static int intel_i915_configure(void)
         readl(intel_private.registers+I810_PGETBL_CTL); /* PCI Posting. */
 
         if (agp_bridge->driver->needs_scratch_page) {
-                for (i = intel_private.gtt_entries; i < current_size->num_entries; i++) {
+                for (i = intel_private.gtt_entries; i < intel_private.gtt_total_size; i++) {
                         writel(agp_bridge->scratch_page, intel_private.gtt+i);
                 }
                 readl(intel_private.gtt+i-1);   /* PCI Posting. */
@@ -1312,6 +1313,8 @@ static int intel_i915_create_gatt_table(struct agp_bridge_data *bridge)
         if (!intel_private.gtt)
                 return -ENOMEM;
 
+        intel_private.gtt_total_size = gtt_map_size / 4;
+
         temp &= 0xfff80000;
 
         intel_private.registers = ioremap(temp, 128 * 4096);
@@ -1398,6 +1401,8 @@ static int intel_i965_create_gatt_table(struct agp_bridge_data *bridge)
         if (!intel_private.gtt)
                 return -ENOMEM;
 
+        intel_private.gtt_total_size = gtt_size / 4;
+
         intel_private.registers = ioremap(temp, 128 * 4096);
         if (!intel_private.registers) {
                 iounmap(intel_private.gtt);