Re: Areca RAID driver remaining items?

[erich]

Dear Arjan van de Ven,

Thanks for your answer.
I will remove CONFIG_SCSI_ARCMSR_MSI in next patch.

If Linux can not assurent the contingous memory space allocating of 
"dma_alloc_coherent" .
When arcmsr get a physical ccb address from areca's firmware.
Does linux has any functions for converting of  "bus to virtual" ?

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 5:56 PM
Subject: Re: Areca RAID driver remaining items?


> On Thu, 2006-02-23 at 17:50 +0800, erich wrote:
> > 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.
>
>
> yes the reason for making this optional is clear, and Christoph also
> understands that.
>
> However the idea that Christoph is proposing is to not make it a compile
> time option, but a runtime option. Compile-time is not very flexible,
> especially not for linux distributions. Making it a module option means
> it becomes runtime behavior, and the user can load the module like
>
> modprobe aerca msi=0
>
> and msi gets turned off. No need to recompile anything! That has many
> advantages over a more inflexible (from the user view) compiletime-only
> option.

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