linux-kernel - [RFC PATCH 6/7] sparc/dma-mapping: override dma_get_page

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Message-ID: <20151023210115.GH10197@linux.vnet.ibm.com>
Date:	Fri, 23 Oct 2015 14:01:15 -0700
From:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	Keith Busch <keith.busch@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	David Gibson <david@...son.dropbear.id.au>,
	Christoph Hellwig <hch@...radead.org>,
	linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org
Subject: [RFC PATCH 6/7] sparc/dma-mapping: override dma_get_page_shift

On sparc, the kernel's page size differs from the IOMMU's page size, so
override the generic implementation, which always returns the kernel's
page size, and return IOMMU_PAGE_SHIFT instead.

Signed-off-by: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>

---
I know very little about sparc, so please correct me if this patch is
invalid.

 arch/sparc/include/asm/dma-mapping.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/sparc/include/asm/dma-mapping.h b/arch/sparc/include/asm/dma-mapping.h
index a21da59..76ba470 100644
--- a/arch/sparc/include/asm/dma-mapping.h
+++ b/arch/sparc/include/asm/dma-mapping.h
@@ -52,6 +52,14 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
 	return -EINVAL;
 }
 
+/* for IOMMU_PAGE_SHIFT */
+#include <asm/iommu_common.h>
+#define HAVE_ARCH_DMA_GET_PAGE_SHIFT 1
+static inline unsigned long dma_get_page_shift(struct device *dev)
+{
+	return IOMMU_PAGE_SHIFT;
+}
+
 #include <asm-generic/dma-mapping-common.h>
 
 #endif
-- 
1.9.1

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