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Date: Wed, 17 Sep 2008 13:13:09 -0600
From: "bhanu jampala" <adams.ppc@gmail.com>
To: linuxppc-embedded@ozlabs.org
Subject: Covert DMA address to Virtual address on Linux PPC
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Hi All,

How do I convert a DMA buffer address to its respective virtual address in
Linux PPC world?

I am not finding appropriate functions to do that?
How are people doing it on PPC platforms?

What I trying to do:
This is for MCC i.e. Buffer Desc and buffer are in main memory (DMA memory)
I have submitted some DMA buffer from a chunk of memory to Device.
Now at the end of successful receive, where I know the DMA address by
reading from the buffer Descriptors.
Now from this DMA address, how do I find out the Virtual address so that I
can perform a read on that buffer?

Regards,
Mukund Jampala

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<div dir="ltr">Hi All,<br><br>How do I convert a DMA buffer address to its respective virtual address in Linux PPC world?<br><br>I am not finding appropriate functions to do that?<br>How are people doing it on PPC platforms?<br>

<br>What I trying to do:<br>This is for MCC i.e. Buffer Desc and buffer are in main memory (DMA memory)<br>
I have submitted some DMA buffer from a chunk of memory to Device.<br>
Now at the end of successful receive, where I know the DMA address by reading from the buffer Descriptors.<br>Now from this DMA address, how do I find out the Virtual address so that I can perform a read on that buffer?<br>

<br>Regards,<br>Mukund Jampala</div>

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