From: Michael Ellerman <michael@ellerman.id.au>
Date: Fri, 25 Jan 2008 05:59:14 +0000 (+1100)
Subject: [POWERPC] Avoid DMA exception when using axon_msi with IOMMU
X-Git-Tag: v2.6.25-rc1~303^2~35
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=de4c928b843063b7079c35c950c1d38c559fa0cb;p=pandora-kernel.git

[POWERPC] Avoid DMA exception when using axon_msi with IOMMU

There's a brown-paper-bag bug in axon_msi, we pass the address of our
FIFO directly to the hardware, without DMA mapping it.  This leads to
DMA exceptions if you enable MSI & the IOMMU.

The fix is to correctly DMA map the fifo, dma_alloc_coherent() does
what we want - and we need to track the virt & phys addresses.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
---

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