Re: [PATCH 5/7] I/OAT: Add support for MSI and MSI-X

[Manu Abraham]

On 7/21/07, Roland Dreier <rdreier@xxxxxxxxx> wrote:
>  > This driver supports some chipsets that do MSI, and some that do MSI-X,
>  > but none that can do both.
>
> Thanks, that's the simple answer I was hoping for.  Obviously if some
> chipsets only do MSI then you need the MSI code in addition to the
> MSI-X code.

In a case where you have a device that which supports MSI-X (multiple
interrupts) but the device in default is in MSI mode, ie some
configuration change is needed on the device. In such a case, how
would one handle between MSI-X and MSI ?

ie the device initially doesn't support MSI-X
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