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From: Chris Wright <chrisw@sous-sol.org>
To: David Woodhouse <dwmw2@infradead.org>
Cc: Chris Wright <chrisw@sous-sol.org>,
	Joerg Roedel <joerg.roedel@amd.com>,
	fujita.tomonori@lab.ntt.co.jp, netdev@vger.kernel.org,
	iommu@lists.linux-foundation.org, mingo@redhat.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/16] DMA-API debugging facility v2
Date: Fri, 6 Feb 2009 10:20:52 -0800	[thread overview]
Message-ID: <20090206182052.GI27684@sequoia.sous-sol.org> (raw)
In-Reply-To: <1233907006.17724.83.camel@macbook.infradead.org>

* David Woodhouse (dwmw2@infradead.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@fff1b000
[  362.283727] DMAR:[DMA Write] Request device [03:00.0] fault addr fff1b000 
[  362.284719] Device 0000:03:00.0 unmapping: 1000@fff1b000

[  362.426974] Device 0000:03:00.0 mapping: 1000@fff1b000
[  362.427040] DMAR:[DMA Write] Request device [03:00.0] fault addr fff1b000 
[  362.429092] Device 0000:03:00.0 unmapping: 1000@fff1b000

[  447.644332] Device 0000:03:00.0 mapping: 1000@fff03000
[  447.644373] DMAR:[DMA Write] Request device [03:00.0] fault addr fff03000 
[  447.646008] Device 0000:03:00.0 unmapping: 1000@fff03000

[  483.037641] Device 0000:03:00.0 mapping: 1000@ffc9f000
[  483.037707] DMAR:[DMA Write] Request device [03:00.0] fault addr ffc9f000 
[  483.038699] Device 0000:03:00.0 unmapping: 1000@ffc9f000

...

Looks like driver is doing the right thing.

  parent reply	other threads:[~2009-02-06 18:21 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-09 16:19 [PATCH 0/16] DMA-API debugging facility v2 Joerg Roedel
2009-01-09 16:19 ` [PATCH 01/16] dma-debug: add Kconfig entry Joerg Roedel
2009-01-09 20:12   ` Randy Dunlap
2009-01-09 16:19 ` [PATCH 02/16] dma-debug: add header file and core data structures Joerg Roedel
2009-01-11  6:25   ` FUJITA Tomonori
2009-01-09 16:19 ` [PATCH 03/16] dma-debug: add hash functions for dma_debug_entries Joerg Roedel
2009-01-09 17:55   ` Evgeniy Polyakov
2009-01-09 18:14     ` Joerg Roedel
2009-01-09 18:23       ` Evgeniy Polyakov
2009-01-09 18:40         ` Joerg Roedel
2009-01-13  8:51   ` Andrew Morton
2009-01-13  8:59     ` David Woodhouse
2009-01-14 11:43     ` Ingo Molnar
2009-01-14 17:39       ` Andrew Morton
2009-01-14 17:43         ` Ingo Molnar
2009-01-14 17:48         ` Ingo Molnar
2009-01-15  3:44           ` FUJITA Tomonori
2009-01-14 17:48         ` David Woodhouse
2009-01-14 17:51         ` Joerg Roedel
2009-01-09 16:19 ` [PATCH 04/16] dma-debug: add allocator code Joerg Roedel
2009-01-10 23:43   ` Ingo Molnar
2009-01-09 16:19 ` [PATCH 05/16] dma-debug: add initialization code Joerg Roedel
2009-01-09 17:58   ` Evgeniy Polyakov
2009-01-09 18:17     ` Joerg Roedel
2009-01-09 16:19 ` [PATCH 06/16] dma-debug: add kernel command line parameters Joerg Roedel
2009-01-09 16:19 ` [PATCH 07/16] dma-debug: add debugfs interface Joerg Roedel
2009-01-10 23:08   ` Ingo Molnar
2009-01-11  7:52     ` Joerg Roedel
2009-01-14 15:22     ` Joerg Roedel
2009-01-10 23:15   ` Ingo Molnar
2009-01-09 16:19 ` [PATCH 08/16] dma-debug: add core checking functions Joerg Roedel
2009-01-10 23:11   ` Ingo Molnar
2009-01-11  7:57     ` Joerg Roedel
2009-01-11  8:34       ` Joerg Roedel
2009-01-14 11:44     ` Joerg Roedel
2009-01-14 11:48       ` Ingo Molnar
2009-01-10 23:12   ` Ingo Molnar
2009-01-11  7:54     ` Joerg Roedel
2009-01-10 23:13   ` Ingo Molnar
2009-01-09 16:19 ` [PATCH 09/16] dma-debug: add checking for map/unmap_single Joerg Roedel
2009-01-09 16:19 ` [PATCH 10/16] dma-debug: add add checking for map/unmap_sg Joerg Roedel
2009-01-09 18:08   ` Evgeniy Polyakov
2009-01-09 18:11     ` Joerg Roedel
2009-01-09 16:19 ` [PATCH 11/16] dma-debug: add checking for [alloc|free]_coherent Joerg Roedel
2009-01-11  6:25   ` FUJITA Tomonori
2009-01-11  6:30     ` FUJITA Tomonori
2009-01-11  7:59       ` Joerg Roedel
2009-01-09 16:19 ` [PATCH 12/16] dma-debug: add checks for sync_single_* Joerg Roedel
2009-01-09 16:19 ` [PATCH 13/16] dma-debug: add checks for sync_single_range_* Joerg Roedel
2009-01-09 16:19 ` [PATCH 14/16] dma-debug: add checks for sync_single_sg_* Joerg Roedel
2009-01-10 23:46   ` Ingo Molnar
2009-01-11  8:00     ` Joerg Roedel
2009-01-09 16:19 ` [PATCH 15/16] dma-debug: x86 architecture bindings Joerg Roedel
2009-01-10 23:04   ` Ingo Molnar
2009-01-10 23:48   ` Ingo Molnar
2009-01-11  6:25   ` FUJITA Tomonori
2009-01-11  8:08     ` Joerg Roedel
2009-01-09 16:19 ` [PATCH 16/16] dma-debug: Documentation update Joerg Roedel
2009-01-09 21:24 ` [PATCH 0/16] DMA-API debugging facility v2 Michael Chan
2009-01-09 22:33   ` Joerg Roedel
2009-01-09 22:37     ` Joerg Roedel
2009-01-11  6:25       ` FUJITA Tomonori
2009-01-10 23:54 ` Ingo Molnar
2009-01-11  8:11   ` Joerg Roedel
2009-02-05 22:52 ` David Woodhouse
2009-02-06  2:05   ` Chris Wright
2009-02-06  7:56     ` David Woodhouse
2009-02-06 16:08       ` Chris Wright
2009-02-06 18:20       ` Chris Wright [this message]
2009-02-12 14:48     ` Joerg Roedel
2009-02-06  2:27   ` Chris Wright
2009-02-12 15:20   ` Joerg Roedel

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