@@ -738,8 +738,10 @@ static int gen6_gmch_probe(struct drm_device *dev,
*gtt_total = (gtt_size / sizeof(gtt_pte_t)) << PAGE_SHIFT;
- /* For GEN6+ the PTEs for the ggtt live at 2MB + BAR0 */
- gtt_bus_addr = pci_resource_start(dev->pdev, 0) + (2<<20);
+ /* For Modern GENs the PTEs and register space are split in the BAR */
+ gtt_bus_addr = pci_resource_start(dev->pdev, 0) +
+ (pci_resource_len(dev->pdev, 0) / 2);
+
dev_priv->gtt.gsm = ioremap_wc(gtt_bus_addr, gtt_size);
if (!dev_priv->gtt.gsm) {
DRM_ERROR("Failed to map the gtt page table\n");
All gen6+ parts so far have 1 BAR which holds both the register space and the GTT PTEs. Up until now, that was a 4MB BAR with half allocated to each. I have a strong hunch (wink, nod, wink) that future gens will also keep a similar 50-50 split though the sizes may change. To help this along change the code to obey the rule of half the total size instead of a hard-coded 2MB. Signed-off-by: Ben Widawsky <ben@bwidawsk.net> --- drivers/gpu/drm/i915/i915_gem_gtt.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)