From mboxrd@z Thu Jan 1 00:00:00 1970 From: 'Christoph Hellwig' Subject: Re: [ANNOUNCE][PATCH 2.6.11 2/3] megaraid_sas: Announcing new mod ule for LSI Logic's SAS based MegaRAID controllers Date: Wed, 9 Mar 2005 22:03:35 +0000 Message-ID: <20050309220335.GA9350@infradead.org> References: <0E3FA95632D6D047BA649F95DAB60E570230CC1C@exa-atlanta> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Received: from pentafluge.infradead.org ([213.146.154.40]:6792 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S261951AbVCIWDn (ORCPT ); Wed, 9 Mar 2005 17:03:43 -0500 Content-Disposition: inline In-Reply-To: <0E3FA95632D6D047BA649F95DAB60E570230CC1C@exa-atlanta> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "Bagalkote, Sreenivas" Cc: 'Arjan van de Ven' , "'linux-kernel@vger.kernel.org'" , "'linux-scsi@vger.kernel.org'" , 'James Bottomley' , "'Matt_Domsch@Dell.com'" , Andrew Morton , 'Christoph Hellwig' On Wed, Mar 09, 2005 at 09:43:47AM -0500, Bagalkote, Sreenivas wrote: > During the module load time, I allocate 32 bit or 64 bit SGLs based on > whether I can receive 64 bit DMA addresses or not. If size of dma_addr_t > is 4, then I allocate only 32 bit SGLs. During the run time, I prepare > 32/64 bit SGLs based on this variable. And since this is compile time > system-wide property, I kept it as driver global. Even for kernels with a 64bit dma_addr_t you can get 32bit dma addresses only. As a start check whether the pci_set_dma_mask for the 64bit mask failed - in that case you can always use 32bit SGLs.