linux-kernel - Re: [BUG] 2.6.23-rc3-mm1 Kernel panic - not syncing: DMA: Memory would be corrupted

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Message-ID: <20070823011606.GL89849@sgi.com>
Date:	Wed, 22 Aug 2007 18:16:06 -0700
From:	Jeremy Higdon <jeremy@....com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	linux-ia64@...r.kernel.org
Subject: Re: [BUG] 2.6.23-rc3-mm1 Kernel panic - not syncing: DMA: Memory would be corrupted

On Wed, Aug 22, 2007 at 06:09:48PM -0700, Jeremy Higdon wrote:
> > I traced the pci_alloc_consistent calls from PrimeIocFifos on my
> > system.  There are two calls for each ioc.  The first is for
> > 266368 bytes, the second for 16320 bytes.
> > 
> > I wonder why Kamalesh's system wants the slightly different
> > amount (263200 bytes) from what my system asks for?
> > 
> > It also looks to be a little unfriendly to swiotlb to ask for
> > more than 256K at a time (see IO_TLB_SEGSIZE) in swiotlb.c
> > 
> > -Tony
> 
> I believe those would vary a bit based on the exact firmware
> rev and perhaps nvram settings.  Also driver settings, but
> those are presumably the same.

> ioc0: LSI53C1030 C0: Capabilities={Initiator}                 | ioc0: LSI53C1030 B2: Capabilities={Initiator}
> scsi0 : ioc0: LSI53C1030 C0, FwRev=01032821h, Ports=1, MaxQ=2 | scsi0 : ioc0: LSI53C1030 B2, FwRev=01030a00h, Ports=1, MaxQ=2
> ioc1: LSI53C1030 C0: Capabilities={Initiator}                 | ioc1: LSI53C1030 B2: Capabilities={Initiator}
> scsi1 : ioc1: LSI53C1030 C0, FwRev=01032821h, Ports=1, MaxQ=2 | scsi1 : ioc1: LSI53C1030 B2, FwRev=01030a00h, Ports=1, MaxQ=2
> ioc2: LSI53C1030 C0: Capabilities={Initiator}                 | ACPI: PCI Interrupt 0000:00:1d.0[A] -> GSI 16 (level, low) ->


Actually, you can see that you have a different chip rev level and different
firmware revs, so that's probably why the requested sizes are a little
different.

Compare /proc/mpt/ioc0/info if you're curious.  There's probably a small
difference.

jeremy
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