[PATCH v3 2/3] iommu/dma: Reserve IOVA for PCI host reserve address list

[Srinath Mannam]

PCI host bridge has list of resource entries contain address ranges for
which IOVA address mapping has to be reserve. These address ranges are
the address holes in dma-ranges DT property.

It is similar to PCI IO resources address ranges reserving in IOMMU for
each EP connected to host bridge.

Signed-off-by: Srinath Mannam <srinath.mannam@xxxxxxxxxxxx>
Based-on-patch-by: Oza Pawandeep <oza.oza@xxxxxxxxxxxx>
Reviewed-by: Oza Pawandeep <poza@xxxxxxxxxxxxxx>
---
 drivers/iommu/dma-iommu.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index d19f3d6..81b591b 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -221,6 +221,14 @@ static void iova_reserve_pci_windows(struct pci_dev *dev,
 		hi = iova_pfn(iovad, window->res->end - window->offset);
 		reserve_iova(iovad, lo, hi);
 	}
+
+	/* Get reserved DMA windows from host bridge */
+	resource_list_for_each_entry(window, &bridge->dma_resv) {
+
+		lo = iova_pfn(iovad, window->res->start - window->offset);
+		hi = iova_pfn(iovad, window->res->end - window->offset);
+		reserve_iova(iovad, lo, hi);
+	}
 }
 
 static int iova_reserve_iommu_regions(struct device *dev,
-- 
2.7.4