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Date: Mon, 31 Jan 2011 10:54:12 -0500
From: Chuck Ebbert <cebbert@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andi Kleen <ak@linux.intel.com>, David Woodhouse <dwmw2@infradead.org>
Subject: b44 driver causes panic when using swiotlb
Message-ID: <20110131105412.7252a09c@katamari>
Organization: Red Hat, Inc.
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The b44 driver is triggering this panic in swiotlb_map_page():

        if (!dma_capable(dev, dev_addr, size))
                panic("map_single: bounce buffer is not DMA'ble");

The kernel log says the bounce buffers are at 0xdb400000, but b44 can
only do DMA to the first 1GB of memory:

 PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
 Placing 64MB software IO TLB between ffff8800db400000 - ffff8800df400000
 software IO TLB at phys 0xdb400000 - 0xdf400000