Messages in this thread | | | From | "erich" <> | Subject | Re: Areca RAID driver remaining items? | Date | Fri, 24 Feb 2006 11:18:17 +0800 |
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Dear Arjan van de Ven, I had misconstruction with >> [Exception is that you can say that you are ok with a bigger mask for >> this type of memory, but just don't do that if you're not]
it should be "pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK)."
Best Regards Erich Chen
----- Original Message ----- From: "erich" <erich@areca.com.tw> To: "Arjan van de Ven" <arjan@infradead.org> Cc: """"Christoph Hellwig"""" <hch@infradead.org>; <linux-scsi@vger.kernel.org>; <linux-kernel@vger.kernel.org>; <billion.wu@areca.com.tw>; <alan@lxorguk.ukuu.org.uk>; <akpm@osdl.org>; <oliver@neukum.org> Sent: Friday, February 24, 2006 10:08 AM Subject: Re: Areca RAID driver remaining items?
> Dear Arjan van de Ven, > > I would keep dma_alloc_coherent usage. > >> [Exception is that you can say that you are ok with a bigger mask for >> this type of memory, but just don't do that if you're not] > > Should I remove "pci_set_dma_mask(pci_device, DMA_64BIT_MASK)" for this > case? > > Best Regards > Erich Chen > > ----- Original Message ----- > From: "Arjan van de Ven" <arjan@infradead.org> > To: "erich" <erich@areca.com.tw> > Cc: """Christoph Hellwig""" <hch@infradead.org>; > <linux-scsi@vger.kernel.org>; <linux-kernel@vger.kernel.org>; > <billion.wu@areca.com.tw>; <alan@lxorguk.ukuu.org.uk>; <akpm@osdl.org>; > <oliver@neukum.org> > Sent: Thursday, February 23, 2006 8:07 PM > Subject: Re: Areca RAID driver remaining items? > > >> On Thu, 2006-02-23 at 19:51 +0800, erich wrote: >>> If Linux can not assurent the contingous memory space allocating of >>> "dma_alloc_coherent" . >> >> coherent memory is guaranteed to be in the "lower" 32 bit of memory! >> So that is good news, I think you are just fine. >> >> [Exception is that you can say that you are ok with a bigger mask for >> this type of memory, but just don't do that if you're not] >> >> >>> When arcmsr get a physical ccb address from areca's firmware. >>> Does linux has any functions for converting of "bus to virtual" ? >> >> not without using pools. You would have to search the list of memory you >> gave it to find that out. >> >> (USB has a similar problem, afaik they solved it with pools) >> >> >
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