[PATCH v1 10/16] xen: swiotlb: Open code map_resource callback
From: Leon Romanovsky <leon@kernel.org>
Date: 2025-08-04 12:44:14
Also in:
linux-block, linux-doc, linux-iommu, linux-mm, linux-nvme, linux-trace-kernel, linuxppc-dev, lkml, rust-for-linux, xen-devel
Subsystem:
the rest, xen hypervisor interface, xen swiotlb subsystem · Maintainers:
Linus Torvalds, Juergen Gross, Stefano Stabellini
From: Leon Romanovsky <leonro@nvidia.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@nvidia.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