linux-kernel - Re: [RFC PATCH 1/2] common: dma-mapping: introduce dma_get_parent

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Date:	Thu, 18 Dec 2014 17:20:12 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Murali Karicheri <m-karicheri2@...com>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
	Will Deacon <Will.Deacon@....com>
Subject: Re: [RFC PATCH 1/2] common: dma-mapping: introduce
 dma_get_parent_cfg() helper

On Thu, Dec 18, 2014 at 12:09:17AM +0000, Arnd Bergmann wrote:
> Will, I think we may have a problem on ARM64 now, since we only replaced
> set_arch_dma_coherent_ops on ARM32 but not ARM64. Can you send a fix for
> this? Without that, we don't have any coherent operations on ARM64 any
> more, unless I'm missing something.

Good point, I think Will forgot about arm64 (weird ;)).

I'll push this out since Will is on holiday, probably shortly after
-rc1.

-----8<--------------------------------------------

>From 40ec7fd94b4efbd5d74185a062433f71c6576e20 Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@....com>
Date: Thu, 18 Dec 2014 17:13:49 +0000
Subject: [PATCH] arm64: Replace set_arch_dma_coherent_ops with
 arch_setup_dma_ops

Commit a3a60f81ee6f (dma-mapping: replace set_arch_dma_coherent_ops with
arch_setup_dma_ops) changes the of_dma_configure() arch dma_ops callback
to arch_setup_dma_ops but only the arch/arm code is updated. Subsequent
commit 97890ba9289c (dma-mapping: detect and configure IOMMU in
of_dma_configure) changes the arch_setup_dma_ops() prototype further to
handle iommu. The patch makes the corresponding arm64 changes.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Reported-by: Arnd Bergmann <arnd@...db.de>
Cc: Will Deacon <will.deacon@....com>
---
 arch/arm64/include/asm/dma-mapping.h | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index d34189bceff7..9ce3e680ae1c 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -52,13 +52,14 @@ static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
 	dev->archdata.dma_ops = ops;
 }
 
-static inline int set_arch_dma_coherent_ops(struct device *dev)
+static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
+				      struct iommu_ops *iommu, bool coherent)
 {
-	dev->archdata.dma_coherent = true;
-	set_dma_ops(dev, &coherent_swiotlb_dma_ops);
-	return 0;
+	dev->archdata.dma_coherent = coherent;
+	if (coherent)
+		set_dma_ops(dev, &coherent_swiotlb_dma_ops);
 }
-#define set_arch_dma_coherent_ops	set_arch_dma_coherent_ops
+#define arch_setup_dma_ops	arch_setup_dma_ops
 
 /* do not use this function in a driver */
 static inline bool is_device_dma_coherent(struct device *dev)
--
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