Re: [PATCH] usb: enable pci MSI/MSIX in usb core

[Clemens Ladisch <clemens@ladisch.de>]

Alex,Shi wrote:
> On Thu, 2012-02-16 at 10:36 +0800, Alex,Shi wrote:
>>>> +/* msi irq handler should be here, if driver has */
>>>> +irqreturn_t hcd_msi_irq(int irq, struct usb_hcd *hcd)
>>>> +{
>>>> +	return hcd->driver->irq(hcd);
>>>> +}
>>>
>>> This works for now, but it isn't going to work in the future.  We need
>>> the USB core to provide us with the irq number so we can map the MSI-X
>>> interrupt to the event ring that generated the interrupt, whenever we
>>> get around to adding multiple event rings.
>>
>> Do you mean to add 2 new vectors for MSI/MSIX in hc_driver?
>
> +	irqreturn_t	(*msi_irq) (struct usb_hcd *hcd);
> +	irqreturn_t	(*msix_irq) (struct usb_hcd *hcd);

The controller driver will need to know which of the multiple MSI-X
interrupts has been raised:

irqreturn_t (*msix_irq)(struct usb_hcd *hcd, unsigned int nr_or_index);


Regards,
Clemens