linux-kernel - Re: [PATCH 2/3] usb: enable pci MSI/MSIX in usb core

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Date:	Thu, 23 Feb 2012 17:11:47 +0800
From:	"Alex,Shi" <alex.shi@...el.com>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc:	Felipe Balbi <balbi@...com>, gregkh@...uxfoundation.org,
	stern@...land.harvard.edu, linux-usb@...r.kernel.org,
	andiry.xu@....com, clemens@...isch.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] usb: enable pci MSI/MSIX in usb core


> What do you mean: there is a relation between event rings
> msix_entries.vectors.  and we need to presents this relationships in the
> msix interrupt handler? 
> 
> So does the following mode you like?
> 
> request_irq(hcd->msix_entries[i].vector, msix_irq_handler, 0, "",
> hcd->ring_handler[i]);
> 
> Or another way to do it if we know which ring will handle the irq, like:

here, I mean let the driver remember this relationships. 
> 
> irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd)
> 
> 	switch (irq2ring(irq))
> 	case ring0: driver_handle_ring(ring0);
> 	case ring1: driver_handle_ring(ring1);
> 
> In fact, since there is no actual usage of multiple rings now, I have no
> much idea of the relationships. 
> 
> BTW, if it is possible do this change to another patch? 


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