linux-kernel - [PATCH v8 07/13] iommu: Explicitly skip bus address marked segments in __iommu_map

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Message-Id: <20220708165104.5005-8-logang@deltatee.com>
Date:   Fri,  8 Jul 2022 10:50:58 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        iommu@...ts.linux.dev
Cc:     Stephen Bates <sbates@...thlin.com>,
        Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Christian König <christian.koenig@....com>,
        John Hubbard <jhubbard@...dia.com>,
        Don Dutile <ddutile@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Minturn Dave B <dave.b.minturn@...el.com>,
        Jason Ekstrand <jason@...kstrand.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Xiong Jianxin <jianxin.xiong@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Ira Weiny <ira.weiny@...el.com>,
        Robin Murphy <robin.murphy@....com>,
        Martin Oliveira <martin.oliveira@...eticom.com>,
        Chaitanya Kulkarni <ckulkarnilinux@...il.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH v8 07/13] iommu: Explicitly skip bus address marked segments  in __iommu_map_sg()

In order to support PCI P2PDMA mappings with dma-iommu, explicitly skip
any segments marked with sg_dma_mark_bus_address() in __iommu_map_sg().

These segments should not be mapped into the IOVA and will be handled
separately in as subsequent patch for dma-iommu.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/iommu/iommu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 847ad47a2dfd..2844a3e02a89 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2457,6 +2457,9 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 			len = 0;
 		}
 
+		if (sg_is_dma_bus_address(sg))
+			goto next;
+
 		if (len) {
 			len += sg->length;
 		} else {
@@ -2464,6 +2467,7 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
 			start = s_phys;
 		}
 
+next:
 		if (++i < nents)
 			sg = sg_next(sg);
 	}
-- 
2.30.2