#define IVHD_FLAG_ISOC_EN_MASK 0x08
#define IVMD_FLAG_EXCL_RANGE 0x08
+#define IVMD_FLAG_IW 0x04
+#define IVMD_FLAG_IR 0x02
#define IVMD_FLAG_UNITY_MAP 0x01
#define ACPI_DEVFLAG_INITPASS 0x01
if (!(m->flags & IVMD_FLAG_EXCL_RANGE))
return;
- if (iommu) {
- /*
- * We only can configure exclusion ranges per IOMMU, not
- * per device. But we can enable the exclusion range per
- * device. This is done here
- */
- set_dev_entry_bit(devid, DEV_ENTRY_EX);
- iommu->exclusion_start = m->range_start;
- iommu->exclusion_length = m->range_length;
- }
+ /*
+ * Treat per-device exclusion ranges as r/w unity-mapped regions
+ * since some buggy BIOSes might lead to the overwritten exclusion
+ * range (exclusion_start and exclusion_length members). This
+ * happens when there are multiple exclusion ranges (IVMD entries)
+ * defined in ACPI table.
+ */
+ m->flags = (IVMD_FLAG_IW | IVMD_FLAG_IR | IVMD_FLAG_UNITY_MAP);
}
/*