linux-kernel - Re: [PATCH 0/2] x86: per-device dma_mapping

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Date:	Thu, 15 May 2008 11:30:48 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	alexisb@...ibm.com
Cc:	fujita.tomonori@....ntt.co.jp, muli@...ibm.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH 0/2] x86: per-device dma_mapping_ops

On Wed, 14 May 2008 19:00:13 -0700
Alexis Bruemmer <alexisb@...ibm.com> wrote:

> On Thu, 2008-05-15 at 10:12 +0900, FUJITA Tomonori wrote:
> > On Wed, 14 May 2008 08:49:24 +0300
> > Muli Ben-Yehuda <muli@...ibm.com> wrote:
> > 
> > > On Tue, May 13, 2008 at 03:04:50PM +0900, FUJITA Tomonori wrote:
> <snip>
> > > Awesome! Much needed, thank you for doing this.
> > 
> > No problem. Well, as you know, it's just a base. We need more work to
> > solve the problems on the top of this.
> Yes thank you!  
> > 
> > I'd like to have a mechanism to register a hook called when a new pci
> > (or dma capable) device is created. It enables IOMMUs to set up an
> > appropriate dma_mapping_ops per device. It could also enables us to
> > simplify the IOMMUs code to initilize devices at startup (for exmple,
> > intel-iommu checks all the pci devices and creates a domain per device
> > if necessary).
> I wanted to try and create a test version of this, at least for the
> calgary side, but ran into an error with this patch set:
> 
> Fusion MPT SAS Host driver 3.04.06
> ACPI: PCI Interrupt 0000:34:00.0[A] -> GSI 142 (level, low) -> IRQ 142
> mptbase: ioc0: Initiating bringup
> ioc0: LSISAS1078 C1: Capabilities={Initiator}
> mptbase: ioc0: PCI-MSI enabled
> Calgary: DMA error on CalIOC2 PHB 0x33
> Calgary: 0x02000000@CSR 0x00000000@...SR 0xb0008000@...R 0x00000000@MCK
> Calgary: 0x00000000@...10 0xfee0c000@...20 0x00000000@...30
> 0x00000000@...40 0x03804a00@...50 0x00000000@...60 0x00000000@...70
> Calgary: 0x00000000@...b0
> mptbase: ioc0: Initiating recovery
> mptbase: ioc0: WARNING - Unexpected doorbell active!
> mptbase: ioc0: WARNING - NOT READY!
> mptbase: ioc0: WARNING - Cannot recover rc = -1!
> mptbase: ioc0: WARNING - Firmware Reload FAILED!
> Clocksource tsc unstable (delta = 48333779773 ns)
> 
> Not sure what is causing this error, but will keep digging.  Any ideas?

Hmm, you don't hit this without my patches, right?
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