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Date: Fri, 6 Feb 2009 10:20:52 -0800 From: Chris Wright <chrisw@...s-sol.org> To: David Woodhouse <dwmw2@...radead.org> Cc: Chris Wright <chrisw@...s-sol.org>, Joerg Roedel <joerg.roedel@....com>, fujita.tomonori@....ntt.co.jp, netdev@...r.kernel.org, iommu@...ts.linux-foundation.org, mingo@...hat.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/16] DMA-API debugging facility v2 * David Woodhouse (dwmw2@...radead.org) wrote: > An alternative explanation... The DMA is aborted¹, and the device > interrupts us to tell us about it at the _same_ time that the IOMMU > interrupts us to tell us about the fault. We process the device > interrupt first, unmap that buffer. And then we process the IOMMU > interrupt... and the buffer is already gone from the list. [ 362.283661] Device 0000:03:00.0 mapping: 1000@...1b000 [ 362.283727] DMAR:[DMA Write] Request device [03:00.0] fault addr fff1b000 [ 362.284719] Device 0000:03:00.0 unmapping: 1000@...1b000 [ 362.426974] Device 0000:03:00.0 mapping: 1000@...1b000 [ 362.427040] DMAR:[DMA Write] Request device [03:00.0] fault addr fff1b000 [ 362.429092] Device 0000:03:00.0 unmapping: 1000@...1b000 [ 447.644332] Device 0000:03:00.0 mapping: 1000@...03000 [ 447.644373] DMAR:[DMA Write] Request device [03:00.0] fault addr fff03000 [ 447.646008] Device 0000:03:00.0 unmapping: 1000@...03000 [ 483.037641] Device 0000:03:00.0 mapping: 1000@...9f000 [ 483.037707] DMAR:[DMA Write] Request device [03:00.0] fault addr ffc9f000 [ 483.038699] Device 0000:03:00.0 unmapping: 1000@...9f000 ... Looks like driver is doing the right thing. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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