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

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Date:	Thu, 15 May 2008 11:21:07 -0700
From:	Alexis Bruemmer <alexisb@...ibm.com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	muli@...ibm.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 0/2] x86: per-device dma_mapping_ops

On Thu, 2008-05-15 at 11:30 +0900, FUJITA Tomonori wrote:
> 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?
oops, you are right, this failure was due to a .config change not your
patch set (MSI not behaving on MegaRAID).  Sorry for the false alarm.
Your patches work as expected.  

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