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Message-ID: <CAHp75Vf5RjL2A=-aP7kw8PzGBS10XPSqBYE57R7h6GvLjkMnhQ@mail.gmail.com>
Date: Thu, 27 Aug 2015 16:49:32 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Christoph Hellwig <hch@....de>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Arnd Bergmann <arnd@...db.de>,
Russell King <linux@....linux.org.uk>, catalin.marinas@....com,
Will Deacon <will.deacon@....com>, ysato@...rs.sourceforge.jp,
Michal Simek <monstr@...str.eu>, jonas@...thpole.se,
cmetcalf@...hip.com, gxt@...c.pku.edu.cn,
"x86@...nel.org" <x86@...nel.org>, linux-alpha@...r.kernel.org,
linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org,
linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
sparclinux@...r.kernel.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] dma-mapping: cosolidate dma_mapping_error
On Mon, Aug 17, 2015 at 10:06 AM, Christoph Hellwig <hch@....de> wrote:
> Currently there are three valid implementations of dma_mapping_error:
>
> (1) call ->mapping_error
> (2) check for a hardcoded error code
> (3) always return 0
>
> This patch provides a common implementation that calls ->mapping_error
> if present, then checks for DMA_ERROR_CODE if defined or otherwise
> returns 0.
Sorry for late comment, but still.
Shall we assign DMA_ERROR_CODE to the type of dma_addr_t ?
I think it might be better to have ((dma_addr_t)(0ULL))
Second observation is ia64 that has bad_dma_address variable exported.
Should code use that instead of 0?
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
> arch/alpha/include/asm/dma-mapping.h | 5 -----
> arch/arm/include/asm/dma-mapping.h | 9 ---------
> arch/arm64/include/asm/dma-mapping.h | 7 -------
> arch/h8300/include/asm/dma-mapping.h | 5 -----
> arch/hexagon/include/asm/dma-mapping.h | 11 +----------
> arch/ia64/include/asm/dma-mapping.h | 7 -------
> arch/microblaze/include/asm/dma-mapping.h | 11 -----------
> arch/mips/include/asm/dma-mapping.h | 8 --------
> arch/openrisc/include/asm/dma-mapping.h | 5 -----
> arch/powerpc/include/asm/dma-mapping.h | 17 ++---------------
> arch/s390/include/asm/dma-mapping.h | 10 ----------
> arch/sh/include/asm/dma-mapping.h | 13 ++-----------
> arch/sparc/include/asm/dma-mapping.h | 6 ------
> arch/tile/include/asm/dma-mapping.h | 7 -------
> arch/unicore32/include/asm/dma-mapping.h | 10 ----------
> arch/x86/include/asm/dma-mapping.h | 11 -----------
> include/asm-generic/dma-mapping-common.h | 14 ++++++++++++++
> 17 files changed, 19 insertions(+), 137 deletions(-)
>
> diff --git a/arch/alpha/include/asm/dma-mapping.h b/arch/alpha/include/asm/dma-mapping.h
> index 0552bf0..80ac3e8 100644
> --- a/arch/alpha/include/asm/dma-mapping.h
> +++ b/arch/alpha/include/asm/dma-mapping.h
> @@ -12,11 +12,6 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
>
> #include <asm-generic/dma-mapping-common.h>
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - return get_dma_ops(dev)->mapping_error(dev, dma_addr);
> -}
> -
> static inline int dma_supported(struct device *dev, u64 mask)
> {
> return get_dma_ops(dev)->dma_supported(dev, mask);
> diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
> index 2191f9c..b4f1b6b 100644
> --- a/arch/arm/include/asm/dma-mapping.h
> +++ b/arch/arm/include/asm/dma-mapping.h
> @@ -172,15 +172,6 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
>
> static inline void dma_mark_clean(void *addr, size_t size) { }
>
> -/*
> - * DMA errors are defined by all-bits-set in the DMA address.
> - */
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - debug_dma_mapping_error(dev, dma_addr);
> - return dma_addr == DMA_ERROR_CODE;
> -}
> -
> extern int dma_supported(struct device *dev, u64 mask);
>
> extern int arm_dma_set_mask(struct device *dev, u64 dma_mask);
> diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
> index 178e60b..f45f444 100644
> --- a/arch/arm64/include/asm/dma-mapping.h
> +++ b/arch/arm64/include/asm/dma-mapping.h
> @@ -84,13 +84,6 @@ static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
> return (phys_addr_t)dev_addr;
> }
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dev_addr)
> -{
> - struct dma_map_ops *ops = get_dma_ops(dev);
> - debug_dma_mapping_error(dev, dev_addr);
> - return ops->mapping_error(dev, dev_addr);
> -}
> -
> static inline int dma_supported(struct device *dev, u64 mask)
> {
> struct dma_map_ops *ops = get_dma_ops(dev);
> diff --git a/arch/h8300/include/asm/dma-mapping.h b/arch/h8300/include/asm/dma-mapping.h
> index 72465ce..5eef053 100644
> --- a/arch/h8300/include/asm/dma-mapping.h
> +++ b/arch/h8300/include/asm/dma-mapping.h
> @@ -20,9 +20,4 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
> return 0;
> }
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - return 0;
> -}
> -
> #endif
> diff --git a/arch/hexagon/include/asm/dma-mapping.h b/arch/hexagon/include/asm/dma-mapping.h
> index 58d2d8f..e661192 100644
> --- a/arch/hexagon/include/asm/dma-mapping.h
> +++ b/arch/hexagon/include/asm/dma-mapping.h
> @@ -31,6 +31,7 @@
>
> struct device;
> extern int bad_dma_address;
> +#define DMA_ERROR_CODE bad_dma_address
>
> extern struct dma_map_ops *dma_ops;
>
> @@ -57,14 +58,4 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
> return addr + size - 1 <= *dev->dma_mask;
> }
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - struct dma_map_ops *dma_ops = get_dma_ops(dev);
> -
> - if (dma_ops->mapping_error)
> - return dma_ops->mapping_error(dev, dma_addr);
> -
> - return (dma_addr == bad_dma_address);
> -}
> -
> #endif
> diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
> index a925ff0..27b713d 100644
> --- a/arch/ia64/include/asm/dma-mapping.h
> +++ b/arch/ia64/include/asm/dma-mapping.h
> @@ -27,13 +27,6 @@ extern void machvec_dma_sync_sg(struct device *, struct scatterlist *, int,
>
> #include <asm-generic/dma-mapping-common.h>
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t daddr)
> -{
> - struct dma_map_ops *ops = platform_dma_get_ops(dev);
> - debug_dma_mapping_error(dev, daddr);
> - return ops->mapping_error(dev, daddr);
> -}
> -
> static inline int dma_supported(struct device *dev, u64 mask)
> {
> struct dma_map_ops *ops = platform_dma_get_ops(dev);
> diff --git a/arch/microblaze/include/asm/dma-mapping.h b/arch/microblaze/include/asm/dma-mapping.h
> index bc81625..e5b8438 100644
> --- a/arch/microblaze/include/asm/dma-mapping.h
> +++ b/arch/microblaze/include/asm/dma-mapping.h
> @@ -87,17 +87,6 @@ static inline void __dma_sync(unsigned long paddr,
> }
> }
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - struct dma_map_ops *ops = get_dma_ops(dev);
> -
> - debug_dma_mapping_error(dev, dma_addr);
> - if (ops->mapping_error)
> - return ops->mapping_error(dev, dma_addr);
> -
> - return (dma_addr == DMA_ERROR_CODE);
> -}
> -
> static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
> enum dma_data_direction direction)
> {
> diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
> index 709b2ba..158bb36 100644
> --- a/arch/mips/include/asm/dma-mapping.h
> +++ b/arch/mips/include/asm/dma-mapping.h
> @@ -37,14 +37,6 @@ static inline int dma_supported(struct device *dev, u64 mask)
> return ops->dma_supported(dev, mask);
> }
>
> -static inline int dma_mapping_error(struct device *dev, u64 mask)
> -{
> - struct dma_map_ops *ops = get_dma_ops(dev);
> -
> - debug_dma_mapping_error(dev, mask);
> - return ops->mapping_error(dev, mask);
> -}
> -
> static inline int
> dma_set_mask(struct device *dev, u64 mask)
> {
> diff --git a/arch/openrisc/include/asm/dma-mapping.h b/arch/openrisc/include/asm/dma-mapping.h
> index 57722528..7dfe9d5 100644
> --- a/arch/openrisc/include/asm/dma-mapping.h
> +++ b/arch/openrisc/include/asm/dma-mapping.h
> @@ -43,11 +43,6 @@ static inline int dma_supported(struct device *dev, u64 dma_mask)
> return dma_mask == DMA_BIT_MASK(32);
> }
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - return 0;
> -}
> -
> static inline int dma_set_mask(struct device *dev, u64 dma_mask)
> {
> if (!dev->dma_mask || !dma_supported(dev, dma_mask))
> diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
> index dec0260..72d05ab 100644
> --- a/arch/powerpc/include/asm/dma-mapping.h
> +++ b/arch/powerpc/include/asm/dma-mapping.h
> @@ -18,7 +18,9 @@
> #include <asm/io.h>
> #include <asm/swiotlb.h>
>
> +#ifdef CONFIG_PPC64
> #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
> +#endif
>
> /* Some dma direct funcs must be visible for use in other dma_ops */
> extern void *dma_direct_alloc_coherent(struct device *dev, size_t size,
> @@ -137,21 +139,6 @@ extern int dma_set_mask(struct device *dev, u64 dma_mask);
> extern int __dma_set_mask(struct device *dev, u64 dma_mask);
> extern u64 __dma_get_required_mask(struct device *dev);
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - struct dma_map_ops *dma_ops = get_dma_ops(dev);
> -
> - debug_dma_mapping_error(dev, dma_addr);
> - if (dma_ops->mapping_error)
> - return dma_ops->mapping_error(dev, dma_addr);
> -
> -#ifdef CONFIG_PPC64
> - return (dma_addr == DMA_ERROR_CODE);
> -#else
> - return 0;
> -#endif
> -}
> -
> static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
> {
> #ifdef CONFIG_SWIOTLB
> diff --git a/arch/s390/include/asm/dma-mapping.h b/arch/s390/include/asm/dma-mapping.h
> index b729efe..3c29329 100644
> --- a/arch/s390/include/asm/dma-mapping.h
> +++ b/arch/s390/include/asm/dma-mapping.h
> @@ -43,14 +43,4 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
> return addr + size - 1 <= *dev->dma_mask;
> }
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - struct dma_map_ops *dma_ops = get_dma_ops(dev);
> -
> - debug_dma_mapping_error(dev, dma_addr);
> - if (dma_ops->mapping_error)
> - return dma_ops->mapping_error(dev, dma_addr);
> - return dma_addr == DMA_ERROR_CODE;
> -}
> -
> #endif /* _ASM_S390_DMA_MAPPING_H */
> diff --git a/arch/sh/include/asm/dma-mapping.h b/arch/sh/include/asm/dma-mapping.h
> index 2c3fa2c..98308c4 100644
> --- a/arch/sh/include/asm/dma-mapping.h
> +++ b/arch/sh/include/asm/dma-mapping.h
> @@ -9,6 +9,8 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
> return dma_ops;
> }
>
> +#define DMA_ERROR_CODE 0
> +
> #include <asm-generic/dma-mapping-common.h>
>
> static inline int dma_supported(struct device *dev, u64 mask)
> @@ -38,17 +40,6 @@ static inline int dma_set_mask(struct device *dev, u64 mask)
> void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
> enum dma_data_direction dir);
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - struct dma_map_ops *ops = get_dma_ops(dev);
> -
> - debug_dma_mapping_error(dev, dma_addr);
> - if (ops->mapping_error)
> - return ops->mapping_error(dev, dma_addr);
> -
> - return dma_addr == 0;
> -}
> -
> /* arch/sh/mm/consistent.c */
> extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
> dma_addr_t *dma_addr, gfp_t flag,
> diff --git a/arch/sparc/include/asm/dma-mapping.h b/arch/sparc/include/asm/dma-mapping.h
> index 2564edc..5069d13 100644
> --- a/arch/sparc/include/asm/dma-mapping.h
> +++ b/arch/sparc/include/asm/dma-mapping.h
> @@ -38,12 +38,6 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
>
> #include <asm-generic/dma-mapping-common.h>
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - debug_dma_mapping_error(dev, dma_addr);
> - return (dma_addr == DMA_ERROR_CODE);
> -}
> -
> static inline int dma_set_mask(struct device *dev, u64 mask)
> {
> #ifdef CONFIG_PCI
> diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h
> index e982dfa..f8f7a05 100644
> --- a/arch/tile/include/asm/dma-mapping.h
> +++ b/arch/tile/include/asm/dma-mapping.h
> @@ -75,13 +75,6 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
> }
>
> static inline int
> -dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - debug_dma_mapping_error(dev, dma_addr);
> - return get_dma_ops(dev)->mapping_error(dev, dma_addr);
> -}
> -
> -static inline int
> dma_supported(struct device *dev, u64 mask)
> {
> return get_dma_ops(dev)->dma_supported(dev, mask);
> diff --git a/arch/unicore32/include/asm/dma-mapping.h b/arch/unicore32/include/asm/dma-mapping.h
> index 636e942..175d7e3 100644
> --- a/arch/unicore32/include/asm/dma-mapping.h
> +++ b/arch/unicore32/include/asm/dma-mapping.h
> @@ -38,16 +38,6 @@ static inline int dma_supported(struct device *dev, u64 mask)
> return dma_ops->dma_supported(dev, mask);
> }
>
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - struct dma_map_ops *dma_ops = get_dma_ops(dev);
> -
> - if (dma_ops->mapping_error)
> - return dma_ops->mapping_error(dev, dma_addr);
> -
> - return 0;
> -}
> -
> #include <asm-generic/dma-mapping-common.h>
>
> static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
> diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
> index 7e47e4d..bbca62e 100644
> --- a/arch/x86/include/asm/dma-mapping.h
> +++ b/arch/x86/include/asm/dma-mapping.h
> @@ -45,17 +45,6 @@ bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
>
> #include <asm-generic/dma-mapping-common.h>
>
> -/* Make sure we keep the same behaviour */
> -static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> -{
> - struct dma_map_ops *ops = get_dma_ops(dev);
> - debug_dma_mapping_error(dev, dma_addr);
> - if (ops->mapping_error)
> - return ops->mapping_error(dev, dma_addr);
> -
> - return (dma_addr == DMA_ERROR_CODE);
> -}
> -
> extern int dma_supported(struct device *hwdev, u64 mask);
> extern int dma_set_mask(struct device *dev, u64 mask);
>
> diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h
> index ec321dd..cdaa241 100644
> --- a/include/asm-generic/dma-mapping-common.h
> +++ b/include/asm-generic/dma-mapping-common.h
> @@ -313,4 +313,18 @@ static inline void dma_free_noncoherent(struct device *dev, size_t size,
> dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
> }
>
> +static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
> +{
> + debug_dma_mapping_error(dev, dma_addr);
> +
> + if (get_dma_ops(dev)->mapping_error)
> + return get_dma_ops(dev)->mapping_error(dev, dma_addr);
> +
> +#ifdef DMA_ERROR_CODE
> + return dma_addr == DMA_ERROR_CODE;
> +#else
> + return 0;
> +#endif
> +}
> +
> #endif
> --
> 1.9.1
>
> --
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--
With Best Regards,
Andy Shevchenko
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