Manu Abraham [mailto:[EMAIL PROTECTED] >Sorry for being not clear. What i was asking is thus: > >A device that has legacy interrupts and MSI-X. I was thinking that if >MSI-X failed one should fall back to MSI mode (single message), that's >what i was assuming. > >In such a case, i do enable MSI-X mode on the device, when the request >for 2 ^ n number of messages (where messages can be a max of 32), If >the request fails one falls into a single message mode, ie MSI ? > > >> What device do you have in mind? > > >The device that i have in mind is a SAA7160.
Notice our code looks at the return from pci_enable_msix() - it will give you a hint whether MSI-X is not supported (returns < 0) or you simply asked for too many (returns > 0). If the former, then fallback to legacy; if the latter, try MSI-X with only one interrupt, which essentially emulates MSI mode. sln -- ====================================================================== Mr. Shannon Nelson LAN Access Division, Intel Corp. [EMAIL PROTECTED] I don't speak for Intel (503) 712-7659 Parents can't afford to be squeamish. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
