Messages in this thread | | | Date | Fri, 21 Nov 2014 09:22:36 +0800 | From | Yijing Wang <> | Subject | Re: Removal of bus->msi assignment breaks MSI with stacked domains |
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On 2014/11/21 0:31, Marc Zyngier wrote: > Bjorn, Yijing, > > I've just realized that patch c167caf8d174 (PCI/MSI: Remove useless > bus->msi assignment) completely breaks MSI on arm64 when using the new > MSI stacked domain:
Sorry, this is my first part to refactor MSI related code, now how to get pci msi_controller depends arch functions(pcibios_msi_controller() or arch_setup_msi_irq()), we are working on generic pci_host_bridge, after that, we could eventually eliminate MSI arch functions and find pci dev 's msi controller by pci_host_bridge->get_msi_controller().
Marc, could you tell me what pci host driver in your test platform ?
> > This patch relies on architectures to implement either > pcibios_msi_controller() or arch_setup_msi_irq(). It turns out that with > stacked domains, none of this is actually necessary, as long as you can > access to the msi_controller. > > And everything was fine until this patch came around (and managed to > test on a system where the PCI devices are not directly attached to the > root bus). Of course, everything now breaks, as we cannot get to the MSI > controller (which contains the domain we allocate the MSIs from). > > In short, this patch breaks an important feature on which arm64 relies, > and I believe this patch should be reverted ASAP.
Bjorn, could you help to revert this patch ?
> > Thanks, > > M. >
-- Thanks! Yijing
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