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From:   Srinath Mannam <srinath.mannam@broadcom.com>
To:     Bjorn Helgaas <bhelgaas@google.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Joerg Roedel <joro@8bytes.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Ray Jui <rjui@broadcom.com>
Cc:     bcm-kernel-feedback-list@broadcom.com, linux-pci@vger.kernel.org,
        iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
        Srinath Mannam <srinath.mannam@broadcom.com>
Subject: [RFC PATCH 2/3] iommu/dma: IOVA reserve for PCI host reserve address list
Date:   Wed, 12 Dec 2018 11:16:08 +0530
Message-Id: <1544593569-8923-3-git-send-email-srinath.mannam@broadcom.com>
In-Reply-To: <1544593569-8923-1-git-send-email-srinath.mannam@broadcom.com>
References: <1544593569-8923-1-git-send-email-srinath.mannam@broadcom.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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