linux-kernel - [PATCH 10/15] dma-direct: Invoke dma offset func if needed

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Date:   Tue, 19 May 2020 16:34:08 -0400
From:   Jim Quinlan <james.quinlan@...adcom.com>
To:     james.quinlan@...adcom.com,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Cc:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org (open list:DMA MAPPING HELPERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 10/15] dma-direct: Invoke dma offset func if needed

Just like dma_pfn_offset, another offset is added to
the dma/phys translation if there happen to be multiple
regions that have different mapping offsets.

Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
---
 include/linux/dma-direct.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 24b8684aa21d..825a773dbbc3 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -15,6 +15,14 @@ static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
 	dma_addr_t dev_addr = (dma_addr_t)paddr;
 
+#ifdef CONFIG_DMA_PFN_OFFSET_MAP
+	if (unlikely(dev->dma_offset_map)) {
+		unsigned long dma_pfn_offset =	dma_pfn_offset_frm_phys_addr(
+			dev->dma_offset_map, paddr);
+
+		return dev_addr - ((dma_addr_t)dma_pfn_offset << PAGE_SHIFT);
+	}
+#endif
 	return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
 }
 
@@ -22,6 +30,14 @@ static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
 {
 	phys_addr_t paddr = (phys_addr_t)dev_addr;
 
+#ifdef CONFIG_DMA_PFN_OFFSET_MAP
+	if (unlikely(dev->dma_offset_map)) {
+		unsigned long dma_pfn_offset = dma_pfn_offset_frm_dma_addr(
+			dev->dma_offset_map, dev_addr);
+
+		return paddr + ((phys_addr_t)dma_pfn_offset << PAGE_SHIFT);
+	}
+#endif
 	return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
 }
 #endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
-- 
2.17.1