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

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Date:   Fri, 25 Jan 2019 15:43:50 +0530
From:   Srinath Mannam <srinath.mannam@...adcom.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        poza@...eaurora.org, Ray Jui <rjui@...adcom.com>
Cc:     bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Srinath Mannam <srinath.mannam@...adcom.com>
Subject: [PATCH v3 2/3] iommu/dma: Reserve IOVA for PCI host reserve address list

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@...adcom.com>
Based-on-patch-by: Oza Pawandeep <oza.oza@...adcom.com>
Reviewed-by: Oza Pawandeep <poza@...eaurora.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