Re: Areca RAID driver remaining items?

[erich]

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@xxxxxxxxxxxx>
To: "Arjan van de Ven" <arjan@xxxxxxxxxxxxx>
Cc: """"Christoph Hellwig"""" <hch@xxxxxxxxxxxxx>; 
<linux-scsi@xxxxxxxxxxxxxxx>; <linux-kernel@xxxxxxxxxxxxxxx>; 
<billion.wu@xxxxxxxxxxxx>; <alan@xxxxxxxxxxxxxxxxxxx>; <akpm@xxxxxxxx>; 
<oliver@xxxxxxxxxx>
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@xxxxxxxxxxxxx>
> To: "erich" <erich@xxxxxxxxxxxx>
> Cc: """Christoph Hellwig""" <hch@xxxxxxxxxxxxx>; 
> <linux-scsi@xxxxxxxxxxxxxxx>; <linux-kernel@xxxxxxxxxxxxxxx>; 
> <billion.wu@xxxxxxxxxxxx>; <alan@xxxxxxxxxxxxxxxxxxx>; <akpm@xxxxxxxx>; 
> <oliver@xxxxxxxxxx>
> 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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