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SubjectRe: Areca RAID driver remaining items?
Date
Dear Arjan van de Ven,

The following contex is coming from comment of Christoph Hellwig.

- msi should be a module options if at all, but defintitly not
a config options

#ifdef CONFIG_SCSI_ARCMSR_MSI
if (!pci_enable_msi(pci_device))
pACB->acb_flags |= ACB_F_HAVE_MSI;
#endif
I make an option config for prevent some mainboards hang up if arcmsr enable
msi function.
Areca RAID controller is bridged hardware.
There were a lots of mainboards had wrong IRQ routing table issue with it.
If somebody meet this issue and people can enable msi function to fix its
hardware bug.
But unfortunately I found some mainboards will hang up if I always enable
this function in my lab.
To avoid this issue, I do an option for this case.

But Christoph Hellwig give me comment with it.

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 4:25 PM
Subject: Re: Areca RAID driver remaining items?

> On Thu, 2006-02-23 at 14:27 +0800, erich wrote:
>> Dear Christoph Hellwig,
>>
>> I have figure out your comments about "remove internal queueing" and
>> "remove
>> odd ioctl".
>> But about "hardware datastructures", areca's firmware spec is need to get
>> a
>> trunk of contingous memory space under 4G.
>> In 64bit platform arcmsr need to make sure all ccbs have same of
>> ccb_phyaddr_hi32 physical address.
>> If arcmsr use dma_pool_alloc do a separate dma mapping.
>> Is there any method to avoid ccbs pool cross 4G segment?
>
> the pci mapping layer prevents that already entirely; there is a LOT of
> hardware that cannot deal with segments crossing 4G boundaries, so much
> in fact that it's now generically disabled.
>
>
>> In some mainboard if I always enable msi function, it will cause system
>> hang
>> up.
>> If it is not a config option, do you have any idea to avoid this issue?
>
> how about a module option (module_param)?
>
>

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