linux-kernel - [PATCH v1 10/16] xen: swiotlb: Open code map

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Message-ID: <e69e9510d9024d664133dc788f5186aac414318e.1754292567.git.leon@kernel.org>
Date: Mon,  4 Aug 2025 15:42:44 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Leon Romanovsky <leonro@...dia.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Abdiel Janulgue <abdiel.janulgue@...il.com>,
	Alexander Potapenko <glider@...gle.com>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>,
	Danilo Krummrich <dakr@...nel.org>,
	iommu@...ts.linux.dev,
	Jason Wang <jasowang@...hat.com>,
	Jens Axboe <axboe@...nel.dk>,
	Joerg Roedel <joro@...tes.org>,
	Jonathan Corbet <corbet@....net>,
	Juergen Gross <jgross@...e.com>,
	kasan-dev@...glegroups.com,
	Keith Busch <kbusch@...nel.org>,
	linux-block@...r.kernel.org,
	linux-doc@...r.kernel.org,
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	linuxppc-dev@...ts.ozlabs.org,
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	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
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	Robin Murphy <robin.murphy@....com>,
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	Steven Rostedt <rostedt@...dmis.org>,
	virtualization@...ts.linux.dev,
	Will Deacon <will@...nel.org>,
	xen-devel@...ts.xenproject.org
Subject: [PATCH v1 10/16] xen: swiotlb: Open code map_resource callback

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

General dma_direct_map_resource() is going to be removed
in next patch, so simply open-code it in xen driver.

Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/xen/swiotlb-xen.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index da1a7d3d377cf..dd7747a2de879 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -392,6 +392,25 @@ xen_swiotlb_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
 	}
 }
 
+static dma_addr_t xen_swiotlb_direct_map_resource(struct device *dev,
+						  phys_addr_t paddr,
+						  size_t size,
+						  enum dma_data_direction dir,
+						  unsigned long attrs)
+{
+	dma_addr_t dma_addr = paddr;
+
+	if (unlikely(!dma_capable(dev, dma_addr, size, false))) {
+		dev_err_once(dev,
+			     "DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n",
+			     &dma_addr, size, *dev->dma_mask, dev->bus_dma_limit);
+		WARN_ON_ONCE(1);
+		return DMA_MAPPING_ERROR;
+	}
+
+	return dma_addr;
+}
+
 /*
  * Return whether the given device DMA address mask can be supported
  * properly.  For example, if your device can only drive the low 24-bits
@@ -426,5 +445,5 @@ const struct dma_map_ops xen_swiotlb_dma_ops = {
 	.alloc_pages_op = dma_common_alloc_pages,
 	.free_pages = dma_common_free_pages,
 	.max_mapping_size = swiotlb_max_mapping_size,
-	.map_resource = dma_direct_map_resource,
+	.map_resource = xen_swiotlb_direct_map_resource,
 };
-- 
2.50.1