Re: [PATCH] PCI: Add support for multiple MSI

[Benjamin Herrenschmidt]

On Fri, 2008-07-11 at 17:28 +0900, Hidetoshi Seto wrote:
> Hi,
> 
> First of all, it seems that mask/unmask of MSI has problems.
>  - Per-vector masking is optional for MSI, so I think that allocating
>    multiple messages for a function without masking capability would be
>    not good idea, since all vector in the block will be masked/unmasked
>    at once without any agreement.
>  - Even if the function supports per-vector masking, current
>    mask/unmask_msi_irq() functions assume that MSI uses only one vector,
>    therefore they only set/unset the first bit of the maskbits which
>    for the first vector of the block.  The bits for other vectors are
>    initialized as 'masked' but no one unmask them.

I tend to think we should just do soft-masking anyway for MSI... better
than whacking config space.

Ben

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