[PATCH v4 03/15] iommu/vt-d: Expose ISA direct mapping region via iommu_get_resv_regions

[Lu Baolu]

To support mapping ISA region via iommu_group_create_direct_mappings,
make sure its exposed by iommu_get_resv_regions.

Signed-off-by: James Sewart <jamessew...@arista.com>
Signed-off-by: Lu Baolu <baolu...@linux.intel.com>
---
 drivers/iommu/intel-iommu.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 4d0fa3097f5d..c42317e27b0c 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5520,6 +5520,20 @@ static void intel_iommu_get_resv_regions(struct device 
*device,
        }
        rcu_read_unlock();
 
+#ifdef CONFIG_INTEL_IOMMU_FLOPPY_WA
+       if (dev_is_pci(device)) {
+               struct pci_dev *pdev = to_pci_dev(device);
+
+               if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) {
+                       reg = iommu_alloc_resv_region(0, 1UL << 24, 0,
+                                                     IOMMU_RESV_DIRECT,
+                                                     GFP_KERNEL);
+                       if (reg)
+                               list_add_tail(&reg->list, head);
+               }
+       }
+#endif /* CONFIG_INTEL_IOMMU_FLOPPY_WA */
+
        reg = iommu_alloc_resv_region(IOAPIC_RANGE_START,
                                      IOAPIC_RANGE_END - IOAPIC_RANGE_START + 1,
                                      0, IOMMU_RESV_MSI, GFP_KERNEL);
-- 
2.17.1