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Subject[RFC PATCH 2/3] iommu/dma: IOVA reserve for PCI host reserve address list
Date
PCI host has list of resource entries contain memory
address range for which IOVA address mapping has to
be reserve.
These address ranges are the address holes in
dma-ranges property.

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

Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
---
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 511ff9a..346da81 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -220,6 +220,14 @@ 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
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