linux-kernel - [RFC 06/16] iommu/dma: Implement link/unlink page callbacks

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Message-ID: <1d3d26afcdbf95b053a3a44ceff34a4fa5334582.1709631413.git.leon@kernel.org>
Date: Tue,  5 Mar 2024 12:22:07 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Christoph Hellwig <hch@....de>,
	Robin Murphy <robin.murphy@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Chaitanya Kulkarni <chaitanyak@...dia.com>
Cc: Leon Romanovsky <leonro@...dia.com>,
	Jonathan Corbet <corbet@....net>,
	Jens Axboe <axboe@...nel.dk>,
	Keith Busch <kbusch@...nel.org>,
	Sagi Grimberg <sagi@...mberg.me>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Alex Williamson <alex.williamson@...hat.com>,
	Jérôme Glisse <jglisse@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	iommu@...ts.linux.dev,
	linux-nvme@...ts.infradead.org,
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	Bart Van Assche <bvanassche@....org>,
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	Dan Williams <dan.j.williams@...el.com>,
	"jack@...e.com" <jack@...e.com>,
	Zhu Yanjun <zyjzyj2000@...il.com>
Subject: [RFC 06/16] iommu/dma: Implement link/unlink page callbacks

From: Leon Romanovsky <leonro@...dia.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@...dia.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