linux-kernel - Re: [PATCH/RFC] cris: add placeholder DMA functions for build coverage

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Date:	Sun, 21 Jun 2015 01:55:52 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Mikael Starvik <starvik@...s.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	linux-cris-kernel@...s.com
Subject: Re: [PATCH/RFC] cris: add placeholder DMA functions for build coverage

On Sat, Jun 20, 2015 at 3:52 PM, Paul Gortmaker
<paul.gortmaker@...driver.com> wrote:
> Currently arch/cris fails the allmodconfig/allyesconfig build
> coverage in linux-next with things like:
>
> drivers/media/platform/sti/bdisp/bdisp-hw.c:132:3: error: implicit
>  declaration of function 'dma_free_attrs'
> drivers/media/platform/sti/bdisp/bdisp-hw.c:157:2: error: implicit
>  declaration of function 'dma_alloc_attrs'
>
> drivers/crypto/marvell/cesa.c: In function 'mv_cesa_get_sram':
> drivers/crypto/marvell/cesa.c:353:2: error: implicit declaration of
>  function 'phys_to_dma'

It looks like the one directly above might need a patch to limit
cesa.c from building across all arch, since phys_to_dma is
missing from sparc, s390, and even i386 with some configs.

So the phys_to_dma (and reverse) implementations may not
be strictly needed for cris just yet, if the above happens.

Paul.
--

>
> We steal the 1st 2 from commit e74993aef4411995960052506a000f94411a7103
> ("xtensa: Provide dummy dma_alloc_attrs() and dma_free_attrs()") and
> the remaining two from commit 8d4f5339d1ee4027c07e6b2a1cfa9dc41b0d383b
> ("x86, IA64, powerpc: add phys_to_dma() and dma_to_phys()")
>
> Cc: Mikael Starvik <starvik@...s.com>
> Cc: Jesper Nilsson <jesper.nilsson@...s.com>
> Cc: linux-cris-kernel@...s.com
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>
> [I don't know anything about cris or what DMA rules it operates under,
>  hence RFC and "placeholder" status....]
>
>  arch/cris/include/asm/dma-mapping.h | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/arch/cris/include/asm/dma-mapping.h b/arch/cris/include/asm/dma-mapping.h
> index 57f794ee6039..224e5e85b0d2 100644
> --- a/arch/cris/include/asm/dma-mapping.h
> +++ b/arch/cris/include/asm/dma-mapping.h
> @@ -168,5 +168,27 @@ extern int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt,
>  #define dma_mmap_coherent(d, v, c, h, s) dma_common_mmap(d, v, c, h, s)
>  #define dma_get_sgtable(d, t, v, h, s) dma_common_get_sgtable(d, t, v, h, s)
>
> +static inline void *dma_alloc_attrs(struct device *dev, size_t size,
> +                                   dma_addr_t *dma_handle, gfp_t flag,
> +                                   struct dma_attrs *attrs)
> +{
> +       return NULL;
> +}
> +
> +static inline void dma_free_attrs(struct device *dev, size_t size,
> +                                 void *vaddr, dma_addr_t dma_handle,
> +                                 struct dma_attrs *attrs)
> +{
> +}
> +
> +static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
> +{
> +       return paddr;
> +}
> +
> +static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
> +{
> +       return daddr;
> +}
>
>  #endif
> --
> 2.2.1
>
> --
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