linux-kernel - [PATCH 2/3] ARM/dma-mapping: take the bus limit into account in __dma

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Date:   Tue, 18 Feb 2020 10:41:02 -0800
From:   Christoph Hellwig <hch@....de>
To:     Russell King <linux@...linux.org.uk>
Cc:     Peter Ujfalusi <peter.ujfalusi@...com>,
        Roger Quadros <rogerq@...com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 2/3] ARM/dma-mapping: take the bus limit into account in __dma_alloc

The DMA coherent allocator needs to take bus limits into account for
picking the zone that the memory is allocated from.

Reported-by: Roger Quadros <rogerq@...com>
Signed-off-by: Christoph Hellwig <hch@....de>
Tested-by: Peter Ujfalusi <peter.ujfalusi@...com>
Tested-by: Roger Quadros <rogerq@...com>
---
 arch/arm/mm/dma-mapping.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 72ddc3d0f5eb..87aba505554a 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -658,7 +658,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
 			 gfp_t gfp, pgprot_t prot, bool is_coherent,
 			 unsigned long attrs, const void *caller)
 {
-	u64 mask = dev->coherent_dma_mask;
+	u64 mask = min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit);
 	struct page *page = NULL;
 	void *addr;
 	bool allowblock, cma;
-- 
2.24.1