linux-kernel - [PATCH v2 7/8] iommu: Introduce iotlb_sync

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Message-Id: <20180804143003.15817-8-digetx@gmail.com>
Date:   Sat,  4 Aug 2018 17:30:02 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     iommu@...ts.linux-foundation.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 7/8] iommu: Introduce iotlb_sync_map callback

Introduce iotlb_sync_map() callback that is invoked in the end of
iommu_map(). This new callback allows IOMMU drivers to avoid syncing
after mapping of each contiguous chunk and sync only when the whole
mapping is completed, optimizing performance of the mapping operation.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Reviewed-by: Robin Murphy <robin.murphy@....com>
---
 drivers/iommu/iommu.c | 8 ++++++--
 include/linux/iommu.h | 1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f3698006cb53..056282f23b10 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1545,13 +1545,14 @@ static size_t iommu_pgsize(struct iommu_domain *domain,
 int iommu_map(struct iommu_domain *domain, unsigned long iova,
 	      phys_addr_t paddr, size_t size, int prot)
 {
+	const struct iommu_ops *ops = domain->ops;
 	unsigned long orig_iova = iova;
 	unsigned int min_pagesz;
 	size_t orig_size = size;
 	phys_addr_t orig_paddr = paddr;
 	int ret = 0;
 
-	if (unlikely(domain->ops->map == NULL ||
+	if (unlikely(ops->map == NULL ||
 		     domain->pgsize_bitmap == 0UL))
 		return -ENODEV;
 
@@ -1580,7 +1581,7 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova,
 		pr_debug("mapping: iova 0x%lx pa %pa pgsize 0x%zx\n",
 			 iova, &paddr, pgsize);
 
-		ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
+		ret = ops->map(domain, iova, paddr, pgsize, prot);
 		if (ret)
 			break;
 
@@ -1589,6 +1590,9 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova,
 		size -= pgsize;
 	}
 
+	if (ops->iotlb_sync_map)
+		ops->iotlb_sync_map(domain);
+
 	/* unroll mapping in case something went wrong */
 	if (ret)
 		iommu_unmap(domain, orig_iova, orig_size - size);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7447b0b0579a..7ed115526fb5 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -206,6 +206,7 @@ struct iommu_ops {
 	void (*flush_iotlb_all)(struct iommu_domain *domain);
 	void (*iotlb_range_add)(struct iommu_domain *domain,
 				unsigned long iova, size_t size);
+	void (*iotlb_sync_map)(struct iommu_domain *domain);
 	void (*iotlb_sync)(struct iommu_domain *domain);
 	phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, dma_addr_t iova);
 	int (*add_device)(struct device *dev);
-- 
2.18.0