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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