Hello, what is missing for MSI support?
Julian Udo Steinberg <[email protected]> wrote: >On Wed, 18 Jul 2012 16:15:04 +0200 Sebastian Sumpf (SS) wrote: > >SS> Nevertheless there are still limitations for Nova. Because of the >large >SS> number of controllers (on my box seven) the driver might discover, >the >SS> PCI legacy interrupts may exhaust pretty quickly, what in return >means >SS> that it is likely that no other driver that depends on PCI-IRQs >might >SS> get access to them. The reason for that is that Genode does >currently >SS> neither support shared interrupts nor message-signaled interrupts >in >SS> Nova's base platform. Also there is no IOMMU support, yet, so one >has to >SS> disable it when using the driver. > >Most PCI devices are only connected to one or two PCI interrupt lines. >This >means you don't have much of a choice which IOAPIC pin an interrupt >from a >particular USB controller will signal. It is very likely that several >of >those USB controllers can only drive the same PCI interrupt line. > >So you need to implement interrupt sharing or alternatively switch to >MSI. >With MSI you can give each device its dedicated interrupt vector. MSI >is a >mandatory feature of PCI-E, but older PCI devices may not support it. > >Cheers, >Udo > > >------------------------------------------------------------------------ > >------------------------------------------------------------------------------ >Live Security Virtual Conference >Exclusive live event will cover all the ways today's security and >threat landscape has changed and how IT managers can respond. >Discussions >will include endpoint security, mobile security and the latest in >malware >threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > >------------------------------------------------------------------------ > >_______________________________________________ >Genode-main mailing list >[email protected] >https://lists.sourceforge.net/lists/listinfo/genode-main -- Sent from my phone. Please excuse my brevity. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Genode-main mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/genode-main
