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Date: Wed, 17 Jan 2007 15:11:27 +0100
Message-ID: <s5hsle9zqsw.wl%tiwai@suse.de>
From: Takashi Iwai <tiwai@suse.de>
To: "Yu-Chen Wu" <g944370@oz.nthu.edu.tw>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: Can a buffer allocated by "vmalloc( )" be used to make DMA transmission (the buffer will be used by BIO structure) on X86_64 platform?
In-Reply-To: <015c01c7397b$e9eb6fb0$0100a8c0@sslabmayasky>
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At Tue, 16 Jan 2007 22:37:56 +0800,
Yu-Chen Wu wrote:
> 
> Hi all,
> Can a buffer allocated by "vmalloc( )" be used to make DMA transmission (the
> buffer will be used by BIO structure) on X86_64 platform?
> I need a big buffer (cache) maybe 64MB or bigger, so I call vmalloc to
> allocate the buffer.
> If possible, how to get the pages in the buffer?

You can resolve the page via vmalloc_to_page(), and pass it in nopage
callback.


Takashi