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Date:   Mon, 11 Feb 2019 16:41:49 +0000
From:   Vineet Gupta <vineet.gupta1@...opsys.com>
To:     Christoph Hellwig <hch@....de>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Paul Burton <paul.burton@...s.com>
CC:     Eugeniy Paltsev <eugeniy.paltsev@...opsys.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] dma-mapping: add a kconfig symbol for
 arch_setup_dma_ops availability

+CC Eugeniy

As resident ARC DMA expert can you please this a quick spin.

-Vineet

On 2/4/19 12:14 AM, Christoph Hellwig wrote:
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  arch/arc/Kconfig                     |  1 +
>  arch/arc/include/asm/Kbuild          |  1 +
>  arch/arc/include/asm/dma-mapping.h   | 13 -------------
>  arch/arm/Kconfig                     |  1 +
>  arch/arm/include/asm/dma-mapping.h   |  4 ----
>  arch/arm64/Kconfig                   |  1 +
>  arch/arm64/include/asm/dma-mapping.h |  4 ----
>  arch/mips/Kconfig                    |  1 +
>  arch/mips/include/asm/dma-mapping.h  | 10 ----------
>  arch/mips/mm/dma-noncoherent.c       |  8 ++++++++
>  include/linux/dma-mapping.h          | 12 ++++++++----
>  kernel/dma/Kconfig                   |  3 +++
>  12 files changed, 24 insertions(+), 35 deletions(-)
>  delete mode 100644 arch/arc/include/asm/dma-mapping.h
>
> diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
> index 376366a7db81..2ab27d88eb1c 100644
> --- a/arch/arc/Kconfig
> +++ b/arch/arc/Kconfig
> @@ -11,6 +11,7 @@ config ARC
>  	select ARC_TIMERS
>  	select ARCH_HAS_DMA_COHERENT_TO_PFN
>  	select ARCH_HAS_PTE_SPECIAL
> +	select ARCH_HAS_SETUP_DMA_OPS
>  	select ARCH_HAS_SYNC_DMA_FOR_CPU
>  	select ARCH_HAS_SYNC_DMA_FOR_DEVICE
>  	select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC
> diff --git a/arch/arc/include/asm/Kbuild b/arch/arc/include/asm/Kbuild
> index caa270261521..b41f8881ecc8 100644
> --- a/arch/arc/include/asm/Kbuild
> +++ b/arch/arc/include/asm/Kbuild
> @@ -3,6 +3,7 @@ generic-y += bugs.h
>  generic-y += compat.h
>  generic-y += device.h
>  generic-y += div64.h
> +generic-y += dma-mapping.h
>  generic-y += emergency-restart.h
>  generic-y += extable.h
>  generic-y += ftrace.h
> diff --git a/arch/arc/include/asm/dma-mapping.h b/arch/arc/include/asm/dma-mapping.h
> deleted file mode 100644
> index c946c0a83e76..000000000000
> --- a/arch/arc/include/asm/dma-mapping.h
> +++ /dev/null
> @@ -1,13 +0,0 @@
> -// SPDX-License-Identifier:  GPL-2.0
> -// (C) 2018 Synopsys, Inc. (www.synopsys.com)
> -
> -#ifndef ASM_ARC_DMA_MAPPING_H
> -#define ASM_ARC_DMA_MAPPING_H
> -
> -#include <asm-generic/dma-mapping.h>
> -
> -void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
> -			const struct iommu_ops *iommu, bool coherent);
> -#define arch_setup_dma_ops arch_setup_dma_ops
> -
> -#endif
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 664e918e2624..c1cf44f00870 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -12,6 +12,7 @@ config ARM
>  	select ARCH_HAS_MEMBARRIER_SYNC_CORE
>  	select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
>  	select ARCH_HAS_PHYS_TO_DMA
> +	select ARCH_HAS_SETUP_DMA_OPS
>  	select ARCH_HAS_SET_MEMORY
>  	select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
>  	select ARCH_HAS_STRICT_MODULE_RWX if MMU
> diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
> index 31d3b96f0f4b..a224b6e39e58 100644
> --- a/arch/arm/include/asm/dma-mapping.h
> +++ b/arch/arm/include/asm/dma-mapping.h
> @@ -96,10 +96,6 @@ static inline unsigned long dma_max_pfn(struct device *dev)
>  }
>  #define dma_max_pfn(dev) dma_max_pfn(dev)
>  
> -#define arch_setup_dma_ops arch_setup_dma_ops
> -extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
> -			       const struct iommu_ops *iommu, bool coherent);
> -
>  #ifdef CONFIG_MMU
>  #define arch_teardown_dma_ops arch_teardown_dma_ops
>  extern void arch_teardown_dma_ops(struct device *dev);
> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
> index a4168d366127..63909f318d56 100644
> --- a/arch/arm64/Kconfig
> +++ b/arch/arm64/Kconfig
> @@ -22,6 +22,7 @@ config ARM64
>  	select ARCH_HAS_KCOV
>  	select ARCH_HAS_MEMBARRIER_SYNC_CORE
>  	select ARCH_HAS_PTE_SPECIAL
> +	select ARCH_HAS_SETUP_DMA_OPS
>  	select ARCH_HAS_SET_MEMORY
>  	select ARCH_HAS_STRICT_KERNEL_RWX
>  	select ARCH_HAS_STRICT_MODULE_RWX
> diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
> index 95dbf3ef735a..de96507ee2c1 100644
> --- a/arch/arm64/include/asm/dma-mapping.h
> +++ b/arch/arm64/include/asm/dma-mapping.h
> @@ -29,10 +29,6 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
>  	return NULL;
>  }
>  
> -void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
> -			const struct iommu_ops *iommu, bool coherent);
> -#define arch_setup_dma_ops	arch_setup_dma_ops
> -
>  #ifdef CONFIG_IOMMU_DMA
>  void arch_teardown_dma_ops(struct device *dev);
>  #define arch_teardown_dma_ops	arch_teardown_dma_ops
> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 0d14f51d0002..dc5d70f674e0 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -1118,6 +1118,7 @@ config DMA_MAYBE_COHERENT
>  
>  config DMA_PERDEV_COHERENT
>  	bool
> +	select ARCH_HAS_SETUP_DMA_OPS
>  	select DMA_NONCOHERENT
>  
>  config DMA_NONCOHERENT
> diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
> index 20dfaad3a55d..34de7b17b41b 100644
> --- a/arch/mips/include/asm/dma-mapping.h
> +++ b/arch/mips/include/asm/dma-mapping.h
> @@ -15,14 +15,4 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
>  #endif
>  }
>  
> -#define arch_setup_dma_ops arch_setup_dma_ops
> -static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
> -				      u64 size, const struct iommu_ops *iommu,
> -				      bool coherent)
> -{
> -#ifdef CONFIG_DMA_PERDEV_COHERENT
> -	dev->dma_coherent = coherent;
> -#endif
> -}
> -
>  #endif /* _ASM_DMA_MAPPING_H */
> diff --git a/arch/mips/mm/dma-noncoherent.c b/arch/mips/mm/dma-noncoherent.c
> index cb38461391cb..0606fc87b294 100644
> --- a/arch/mips/mm/dma-noncoherent.c
> +++ b/arch/mips/mm/dma-noncoherent.c
> @@ -159,3 +159,11 @@ void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size,
>  
>  	dma_sync_virt(vaddr, size, direction);
>  }
> +
> +#ifdef CONFIG_DMA_PERDEV_COHERENT
> +void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
> +		const struct iommu_ops *iommu, bool coherent)
> +{
> +	dev->dma_coherent = coherent;
> +}
> +#endif
> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
> index b904d55247ab..2b20d60e6158 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -671,11 +671,15 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
>  	return dma_set_mask_and_coherent(dev, mask);
>  }
>  
> -#ifndef arch_setup_dma_ops
> +#ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS
> +void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
> +		const struct iommu_ops *iommu, bool coherent);
> +#else
>  static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base,
> -				      u64 size, const struct iommu_ops *iommu,
> -				      bool coherent) { }
> -#endif
> +		u64 size, const struct iommu_ops *iommu, bool coherent)
> +{
> +}
> +#endif /* CONFIG_ARCH_HAS_SETUP_DMA_OPS */
>  
>  #ifndef arch_teardown_dma_ops
>  static inline void arch_teardown_dma_ops(struct device *dev) { }
> diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
> index ca88b867e7fe..c44599d128e8 100644
> --- a/kernel/dma/Kconfig
> +++ b/kernel/dma/Kconfig
> @@ -19,6 +19,9 @@ config ARCH_HAS_DMA_COHERENCE_H
>  config HAVE_GENERIC_DMA_COHERENT
>  	bool
>  
> +config ARCH_HAS_SETUP_DMA_OPS
> +	bool
> +
>  config ARCH_HAS_SYNC_DMA_FOR_DEVICE
>  	bool
>  

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