linux-kernel - Re: [PATCH v5] dma-debug: New interfaces to debug dma mapping errors

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Message-ID: <20121024150836.GB2764@amd.com>
Date:	Wed, 24 Oct 2012 17:08:36 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Shuah Khan <shuah.khan@...com>
CC:	<konrad.wilk@...cle.com>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<hpa@...or.com>, <rob@...dley.net>, <akpm@...ux-foundation.org>,
	<stern@...land.harvard.edu>, <bhelgaas@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
	<devel@...uxdriverproject.org>, <x86@...nel.org>,
	<shuahkhan@...il.com>
Subject: Re: [PATCH v5] dma-debug: New interfaces to debug dma mapping errors

On Mon, Oct 08, 2012 at 11:08:06AM -0600, Shuah Khan wrote:
> Add dma-debug interface debug_dma_mapping_error() to debug drivers that fail
> to check dma mapping errors on addresses returned by dma_map_single() and
> dma_map_page() interfaces. This interface clears a flag set by
> debug_dma_map_page() to indicate that dma_mapping_error() has been called by
> the driver. When driver does unmap, debug_dma_unmap() checks the flag and if
> this flag is still set, prints warning message that includes call trace that
> leads up to the unmap. This interface can be called from dma_mapping_error()
> routines to enable dma mapping error check debugging.
> 
> Tested: Intel iommu and swiotlb (iommu=soft) on x86-64 with
>         CONFIG_DMA_API_DEBUG enabled and disabled.
> 
> Signed-off-by: Shuah Khan <shuah.khan@...com>

Applied, thanks.

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