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Date: Fri, 17 Feb 2012 11:15:45 +0100 From: Clemens Ladisch <clemens@...isch.de> To: "Alex,Shi" <alex.shi@...el.com> CC: Sarah Sharp <sarah.a.sharp@...ux.intel.com>, stern@...land.harvard.edu, Greg KH <gregkh@...uxfoundation.org>, linux-usb@...r.kernel.org, andiry.xu@....com, linux-kernel@...r.kernel.org, Oliver Neukum <oneukum@...e.de>, Takashi Iwai <tiwai@...e.de>, trenn@...e.de, linux-pci@...r.kernel.org, Michal Marek <MMarek@...e.com> Subject: Re: [PATCH] usb: enable pci MSI/MSIX in usb core Alex,Shi wrote: >> 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); > > Actually, hcd has 2 object for msix, msix_count and msix_entries. > > Do you mean msix_count maybe smaller than we decide in hcd_setup_msix()? No. But when msic_count > 1, we have multiple interrupts. > Which situation will make this? Assume that an XHCI controller has two rings, and that each one gets its own MSI-X interrupt. How should the driver decide which of the rings needs to be handled? irqreturn_t xhci_msix_irq(struct usb_hcd *hcd) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); if (...) handle(xhci->ring[0]); else handle(xhci->ring[1]); } I.e., what should go into the if()? Regards, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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