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.man...@broadcom.com>
Based-on-patch-by: Oza Pawandeep <oza....@broadcom.com>
Reviewed-by: Oza Pawandeep <p...@codeaurora.org>
---
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
