[RFC RESEND 06/16] iommu/dma: Implement link/unlink page callbacks

[Leon Romanovsky <leon@kernel.org>]

From: Leon Romanovsky <leonro@nvidia.com>

Add an implementation of link/unlink interface to perform in map/unmap
pages in fast patch for pre-allocated IOVA.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 drivers/iommu/dma-iommu.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index dbdd373a609a..b683c4a4e9f8 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -1752,6 +1752,21 @@ static void iommu_dma_free_iova(struct device *dev, dma_addr_t iova,
 	__iommu_dma_free_iova(cookie, iova, size, &iotlb_gather);
 }
 
+static dma_addr_t iommu_dma_link_range(struct device *dev, struct page *page,
+				       unsigned long offset, dma_addr_t iova,
+				       size_t size, enum dma_data_direction dir,
+				       unsigned long attrs)
+{
+	return __iommu_dma_map_pages(dev, page, offset, iova, size, dir, attrs);
+}
+
+static void iommu_dma_unlink_range(struct device *dev, dma_addr_t addr,
+				   size_t size, enum dma_data_direction dir,
+				   unsigned long attrs)
+{
+	__iommu_dma_unmap_pages(dev, addr, size, dir, attrs, false);
+}
+
 static const struct dma_map_ops iommu_dma_ops = {
 	.flags			= DMA_F_PCI_P2PDMA_SUPPORTED,
 	.alloc			= iommu_dma_alloc,
@@ -1776,6 +1791,8 @@ static const struct dma_map_ops iommu_dma_ops = {
 	.opt_mapping_size	= iommu_dma_opt_mapping_size,
 	.alloc_iova		= iommu_dma_alloc_iova,
 	.free_iova		= iommu_dma_free_iova,
+	.link_range		= iommu_dma_link_range,
+	.unlink_range		= iommu_dma_unlink_range,
 };
 
 /*
-- 
2.44.0