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Subject[PATCH v4 03/15] iommu/vt-d: Expose ISA direct mapping region via iommu_get_resv_regions
Date
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 <jamessewart@arista.com>
Signed-off-by: Lu Baolu <baolu.lu@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
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