From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sinan Kaya Subject: Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails Date: Tue, 10 Nov 2015 15:26:02 -0500 Message-ID: <564252DA.5000004@codeaurora.org> References: <1447034266-28003-1-git-send-email-okaya@codeaurora.org> <5349261.sTnZTFhKWB@wuerfel> <56421610.50005@codeaurora.org> <4982446.ZlJVrezq1Y@wuerfel> <56422725.7040809@codeaurora.org> <1447180034.2187.20.camel@HansenPartnership.com> <56424200.9080406@codeaurora.org> <1447184611.2187.45.camel@HansenPartnership.com> <56424BF4.2040207@codeaurora.org> <1447185920.2187.53.camel@HansenPartnership.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from smtp.codeaurora.org ([198.145.29.96]:49677 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751028AbbKJU0H (ORCPT ); Tue, 10 Nov 2015 15:26:07 -0500 In-Reply-To: <1447185920.2187.53.camel@HansenPartnership.com> Sender: linux-arm-msm-owner@vger.kernel.org List-Id: linux-arm-msm@vger.kernel.org To: James Bottomley Cc: Arnd Bergmann , linux-arm-kernel@lists.infradead.org, Abhijit Mahajan , Nagalakshmi Nandigama , linux-scsi@vger.kernel.org, jcm@redhat.com, timur@codeaurora.org, linux-kernel@vger.kernel.org, Sreekanth Reddy , Praveen Krishnamoorthy , cov@codeaurora.org, linux-arm-msm@vger.kernel.org, agross@codeaurora.org, MPT-FusionLinux.pdl@avagotech.com, Hannes Reinecke On 11/10/2015 3:05 PM, James Bottomley wrote: > OK, you don't seem to be understanding the problem: the Altix isn't a > LSI card, it was a SGI platform. Got it. > 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 can't fix the issue if the card cannot do 64 bit DMA when IOMMU is not there. I need IOMMU enabled all the time for this card. -- Sinan Kaya Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project