linux-kernel - Re: [PATCH 11/16] dma-debug: add checking for [alloc|free]

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Message-Id: <20090111150026Y.fujita.tomonori@lab.ntt.co.jp>
Date:	Sun, 11 Jan 2009 15:25:42 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	joerg.roedel@....com
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	dwmw2@...radead.org, fujita.tomonori@....ntt.co.jp,
	netdev@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 11/16] dma-debug: add checking for [alloc|free]_coherent

On Fri, 9 Jan 2009 17:19:25 +0100
Joerg Roedel <joerg.roedel@....com> wrote:

> Impact: add debug callbacks for dma_[alloc|free]_coherent
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  include/linux/dma-debug.h |   16 ++++++++++++++++
>  lib/dma-debug.c           |   45 +++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 61 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/dma-debug.h b/include/linux/dma-debug.h
> index b2131f4..a28a701 100644
> --- a/include/linux/dma-debug.h
> +++ b/include/linux/dma-debug.h
> @@ -40,6 +40,12 @@ extern void debug_map_sg(struct device *dev, struct scatterlist *sg,
>  extern void debug_unmap_sg(struct device *dev, struct scatterlist *sglist,
>  			   int nelems, int dir);
>  
> +extern void debug_alloc_coherent(struct device *dev, size_t size,
> +				 dma_addr_t dma_addr, void *virt);
> +
> +extern void debug_free_coherent(struct device *dev, size_t size,
> +				void *virt, dma_addr_t addr);
> +
>  #else /* CONFIG_DMA_API_DEBUG */
>  
>  static inline void dma_debug_init(u32 num_entries)
> @@ -68,6 +74,16 @@ static inline void debug_unmap_sg(struct device *dev,
>  {
>  }
>  
> +static inline void debug_alloc_coherent(struct device *dev, size_t size,
> +					dma_addr_t dma_addr, void *virt)
> +{
> +}
> +
> +static inline void debug_free_coherent(struct device *dev, size_t size,
> +				       void *virt, dma_addr_t addr)
> +{
> +}
> +
>  #endif /* CONFIG_DMA_API_DEBUG */
>  
>  #endif /* __DMA_DEBUG_H */
> diff --git a/lib/dma-debug.c b/lib/dma-debug.c
> index e6d45f9..a4a5b0f 100644
> --- a/lib/dma-debug.c
> +++ b/lib/dma-debug.c
> @@ -604,3 +604,48 @@ void debug_unmap_sg(struct device *dev, struct scatterlist *sglist,
>  }
>  EXPORT_SYMBOL(debug_unmap_sg);
>  
> +void debug_alloc_coherent(struct device *dev, size_t size,
> +			  dma_addr_t dma_addr, void *virt)
> +{
> +	struct dma_debug_entry *entry;
> +
> +	if (global_disable)
> +		return;
> +
> +	if (dma_addr == bad_dma_address)
> +		return;

Only X86 has 'bad_dma_address' (IA64 also has with some configurations
though). You need to use dma_mapping_error, as I pointed out in the
previous submission.

I recommend you to try this on one non-x86 box (at least). Even if you
don't have non x86, you can use cross compiler.
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