linux-kernel - equivalent of phys_to

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Message-ID: <AANLkTi=+Hx+3Jk0yprAffhvQM+WcO+WytaLBU-vwbetc@mail.gmail.com>
Date:	Fri, 28 Jan 2011 10:44:19 +0530
From:	MJ embd <mj.embd@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: equivalent of phys_to_virt in an iommu system

Hi,

Assuming at core mmu there is a mapping, V1 -> P1
And at the IOMMU for the device to access a region of DDR there is a
mapping P2 -> P1. [P2 is the address on which device issues a r/w]

Now the device driver does the following.

Line 0: V1 = kmalloc();
Line 1: P2 = dma_map_single(V1)

Now if later in the driver, there is a requirement to get V1 from P2
what is the primitive in linux  ?
Also is my understanding of Line 1(above) correct ?

-- 
-mj
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