linux-kernel - Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails

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Date:	Tue, 10 Nov 2015 12:05:20 -0800
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Sinan Kaya <okaya@...eaurora.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	linux-arm-kernel@...ts.infradead.org,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	linux-scsi@...r.kernel.org, jcm@...hat.com, timur@...eaurora.org,
	linux-kernel@...r.kernel.org,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	cov@...eaurora.org, linux-arm-msm@...r.kernel.org,
	agross@...eaurora.org, MPT-FusionLinux.pdl@...gotech.com,
	Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA
 fails

On Tue, 2015-11-10 at 14:56 -0500, Sinan Kaya wrote:
> 
> On 11/10/2015 2:43 PM, James Bottomley wrote:
> > The Issue, as stated by LSI is
> >
> >          Initially set the consistent DMA mask to 32 bit and then change
> >          it
> >          to 64 bit mask after allocating RDPQ pools by calling the
> >          function
> >          _base_change_consistent_dma_mask. This is to ensure that all the
> >          upper 32 bits of RDPQ entries's base address to be same.
> >
> 
> Need somebody from mpt to confirm that this behavior is still valid for 
> the recent cards besides altix.

OK, you don't seem to be understanding the problem: the Altix isn't a
LSI card, it was a SGI platform.  It was the platform where we first
discovered the issue that a lot of storage cards didn't work because it
by default had no memory below 4GB.  The reason coherent masks were
introduced was initially so the Altix could manufacture and manage a
region of memory in the lower 4GB region and we would guarantee to make
allocations from it so the storage cards would then work on that
platform.

I thought the Altix was a historical relic because after they
disappeared, there was no other platform with this issue ...  until you
came along.

James


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