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From: Brian King <brking@linux.vnet.ibm.com>
To: Sreekanth Reddy <sreekanth.reddy@avagotech.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	linux-scsi <linux-scsi@vger.kernel.org>
Subject: mpt2sas DMA mask
Date: Tue, 12 May 2015 17:07:36 -0500	[thread overview]
Message-ID: <555279A8.6060906@linux.vnet.ibm.com> (raw)

The mpt2sas driver was changed late last year in that it now requests a 64 bit DMA
mask, then requests a 32 bit coherent DMA mask, then later requests a 64 bit coherent
DMA mask. This was 5fb1bf8aaa832e1e9ca3198de7bbecb8eff7db9c. This breaks 64 bit DMA
support for mpt2sas on Power and we always fall back to using 32 bit DMA. Looking
at the commit log, it looks like this was an intentional change.

Ben - you had a patch set you had posted to the list back in Feb of this year, but it
doesn't look like it got merged. 

https://lists.ozlabs.org/pipermail/linuxppc-dev/2015-February/125087.html

This would fix the issue I'm seeing on mpt2sas. Do you plan to dust that patch set
off and upstream it? Were there issues with it that still need to be resolved?

Thanks,

Brian

-- 
Brian King
Power Linux I/O
IBM Linux Technology Center

             reply	other threads:[~2015-05-12 22:07 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-12 22:07 Brian King [this message]
2015-05-12 22:10 ` mpt2sas DMA mask Benjamin Herrenschmidt
2015-05-12 23:24   ` [PATCH] mpt2sas: Fall back to 64 bit coherent mask if 64 bit DMA / 32 bit coherent mask not supported Brian King
2015-05-13  8:10     ` Arnd Bergmann
2015-05-13 13:23       ` Brian King
2015-05-13 13:31         ` Arnd Bergmann
2015-05-13 13:59           ` James Bottomley
2015-05-13 14:12           ` Brian King
2015-05-13 16:44             ` Sreekanth Reddy
2015-05-13 20:56               ` Benjamin Herrenschmidt
2015-05-13 21:37                 ` Brian King
2015-05-14  7:43                   ` [RFC/PATCH] powerpc/iommu: Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask Benjamin Herrenschmidt
2015-05-14 21:34                     ` Brian King
2015-05-14 21:58                   ` [RFC/PATCH v2] " Benjamin Herrenschmidt
2015-05-14 22:03                   ` [RFC/PATCH v3] " Benjamin Herrenschmidt
2015-05-15 22:19                     ` Brian King
2015-05-18  3:56                   ` [PATCH] " Benjamin Herrenschmidt
2015-05-18  6:40                     ` Michael Ellerman
2015-06-19 21:19                       ` Brian King
2015-06-19 23:01                         ` Benjamin Herrenschmidt
2015-06-29 19:38                           ` Brian King

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