linux-kernel - [PATCH 04/13] iommu/dma: Use sychronized interface of the IOMMU-API

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Date:   Thu, 17 Aug 2017 14:56:27 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org,
        Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
        Joerg Roedel <jroedel@...e.de>,
        Robin Murphy <robin.murphy@....com>,
        Will Deacon <will.deacon@....com>,
        Nate Watterson <nwatters@...eaurora.org>,
        Eric Auger <eric.auger@...hat.com>,
        Mitchel Humpherys <mitchelh@...eaurora.org>
Subject: [PATCH 04/13] iommu/dma: Use sychronized interface of the IOMMU-API

From: Joerg Roedel <jroedel@...e.de>

The map and unmap functions of the IOMMU-API changed their
semantics: They do no longer guarantee that the hardware
TLBs are synchronized with the page-table updates they made.

To make conversion easier, new synchronized functions have
been introduced which give these guarantees again until the
code is converted to use the new TLB-flush interface of the
IOMMU-API, which allows certain optimizations.

But for now, just convert this code to use the synchronized
functions so that it will behave as before.

Cc: Robin Murphy <robin.murphy@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: Nate Watterson <nwatters@...eaurora.org>
Cc: Eric Auger <eric.auger@...hat.com>
Cc: Mitchel Humpherys <mitchelh@...eaurora.org>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/dma-iommu.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 9d1cebe..38c41a2 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -417,7 +417,7 @@ static void __iommu_dma_unmap(struct iommu_domain *domain, dma_addr_t dma_addr,
 	dma_addr -= iova_off;
 	size = iova_align(iovad, size + iova_off);
 
-	WARN_ON(iommu_unmap(domain, dma_addr, size) != size);
+	WARN_ON(iommu_unmap_sync(domain, dma_addr, size) != size);
 	iommu_dma_free_iova(cookie, dma_addr, size);
 }
 
@@ -572,7 +572,7 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
 		sg_miter_stop(&miter);
 	}
 
-	if (iommu_map_sg(domain, iova, sgt.sgl, sgt.orig_nents, prot)
+	if (iommu_map_sg_sync(domain, iova, sgt.sgl, sgt.orig_nents, prot)
 			< size)
 		goto out_free_sg;
 
@@ -631,7 +631,7 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys,
 	if (!iova)
 		return IOMMU_MAPPING_ERROR;
 
-	if (iommu_map(domain, iova, phys - iova_off, size, prot)) {
+	if (iommu_map_sync(domain, iova, phys - iova_off, size, prot)) {
 		iommu_dma_free_iova(cookie, iova, size);
 		return IOMMU_MAPPING_ERROR;
 	}
@@ -791,7 +791,7 @@ int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
 	 * We'll leave any physical concatenation to the IOMMU driver's
 	 * implementation - it knows better than we do.
 	 */
-	if (iommu_map_sg(domain, iova, sg, nents, prot) < iova_len)
+	if (iommu_map_sg_sync(domain, iova, sg, nents, prot) < iova_len)
 		goto out_free_iova;
 
 	return __finalise_sg(dev, sg, nents, iova);
-- 
2.7.4