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path: root/drivers/misc/mic/scif/scif_map.h
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Diffstat (limited to 'drivers/misc/mic/scif/scif_map.h')
-rw-r--r--drivers/misc/mic/scif/scif_map.h25
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/misc/mic/scif/scif_map.h b/drivers/misc/mic/scif/scif_map.h
index 20e50b4e19b2..3e86360ba5a6 100644
--- a/drivers/misc/mic/scif/scif_map.h
+++ b/drivers/misc/mic/scif/scif_map.h
@@ -80,7 +80,7 @@ scif_unmap_single(dma_addr_t local, struct scif_dev *scifdev,
size_t size)
{
if (!scifdev_self(scifdev)) {
- if (scifdev_is_p2p(scifdev) && local > scifdev->base_addr)
+ if (scifdev_is_p2p(scifdev))
local = local - scifdev->base_addr;
dma_unmap_single(&scifdev->sdev->dev, local,
size, DMA_BIDIRECTIONAL);
@@ -110,4 +110,27 @@ scif_iounmap(void *virt, size_t len, struct scif_dev *scifdev)
sdev->hw_ops->iounmap(sdev, (void __force __iomem *)virt);
}
}
+
+static __always_inline int
+scif_map_page(dma_addr_t *dma_handle, struct page *page,
+ struct scif_dev *scifdev)
+{
+ int err = 0;
+
+ if (scifdev_self(scifdev)) {
+ *dma_handle = page_to_phys(page);
+ } else {
+ struct scif_hw_dev *sdev = scifdev->sdev;
+ *dma_handle = dma_map_page(&sdev->dev,
+ page, 0x0, PAGE_SIZE,
+ DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(&sdev->dev, *dma_handle))
+ err = -ENOMEM;
+ else if (scifdev_is_p2p(scifdev))
+ *dma_handle = *dma_handle + scifdev->base_addr;
+ }
+ if (err)
+ *dma_handle = 0;
+ return err;
+}
#endif /* SCIF_MAP_H */