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    SubjectRe: Areca RAID driver remaining items?
    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

    if (!pci_enable_msi(pci_device))
    pACB->acb_flags |= ACB_F_HAVE_MSI;

    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" <>
    To: "erich" <>
    Cc: "Christoph Hellwig" <>; <>;
    <>; <>;
    <>; <>; <>
    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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