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authorDavid Woodhouse <dwmw2@infradead.org>2009-12-02 11:00:05 +0000
committerEric Anholt <eric@anholt.net>2009-12-07 15:29:04 -0800
commitfc61901373987ad61851ed001fe971f3ee8d96a3 (patch)
tree2711786140a63cbbbf7154ac1e5d2f1bc11e2b86 /drivers/char
parentf2b115e69d46344ae7afcaad5823496d2a0d8650 (diff)
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>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/agp/intel-agp.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index 37cb4e2b232..33b4853b135 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);