linux-kernel - [PATCH v2 10/14] arm: dma-mapping: Invoke dma offset func if needed

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Date:   Tue, 26 May 2020 15:12:49 -0400
From:   Jim Quinlan <james.quinlan@...adcom.com>
To:     linux-pci@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com
Cc:     Russell King <linux@...linux.org.uk>,
        Julien Grall <julien.grall@....com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM PORT),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 10/14] arm: dma-mapping: 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>
---
 arch/arm/include/asm/dma-mapping.h | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index bdd80ddbca34..811389b4fb29 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -35,8 +35,12 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 #ifndef __arch_pfn_to_dma
 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
 {
-	if (dev)
+	if (dev) {
+		/* This should compile out if !CONFIG_DMA_PFN_OFFSET_MAP */
+		pfn -= dma_pfn_offset_from_phys_addr(dev, PFN_PHYS(pfn));
+
 		pfn -= dev->dma_pfn_offset;
+	}
 	return (dma_addr_t)__pfn_to_bus(pfn);
 }
 
@@ -44,9 +48,12 @@ static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
 {
 	unsigned long pfn = __bus_to_pfn(addr);
 
-	if (dev)
-		pfn += dev->dma_pfn_offset;
+	if (dev) {
+		/* This should compile out if !CONFIG_DMA_PFN_OFFSET_MAP */
+		pfn += dma_pfn_offset_from_dma_addr(dev, addr);
 
+		pfn += dev->dma_pfn_offset;
+	}
 	return pfn;
 }
 
-- 
2.17.1