+ /* Before gen4, the registers and the GTT are behind different BARs.
+ * However, from gen4 onwards, the registers and the GTT are shared
+ * in the same BAR, so we want to restrict this ioremap from
+ * clobbering the GTT which we want ioremap_wc instead. Fortunately,
+ * the register BAR remains the same size for all the earlier
+ * generations up to Ironlake.
+ */
+ if (info->gen < 5)
+ mmio_size = 512*1024;
+ else
+ mmio_size = 2*1024*1024;
+
+ dev_priv->regs = pci_iomap(dev->pdev, mmio_bar, mmio_size);