Messages in this thread | | | From | Bjorn Helgaas <> | Subject | Re: [PATCH] PCI MSI Kconfig consolidation | Date | Tue, 13 Apr 2004 14:08:17 -0600 |
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On Tuesday 13 April 2004 1:16 pm, Nguyen, Tom L wrote: > On Tuesday, April 13, Bjorn Helgaas wrote: > > > This consolidates the PCI MSI configuration into drivers/pci/Kconfig, > > removing it from the i386, x86_64, and ia64 Kconfig. > > > > It also changes the default for ia64 from "y" to "n". The default on > > i386 is "n" already, and I'm not sure why ia64 should be different. > > It looks good; however, it may create a confusion on ia64 because ia64 > is already vector-based indexing.
No. This is one reason why I think the MSI configuration symbol should be CONFIG_PCI_MSI, not CONFIG_PCI_USE_VECTOR.
The fact that external interrupts in the ia64 architecture include a number, and that we happen to call that number a "vector", has nothing to do with PCI MSI.
In fact, I think there's a whole lot more architecture-specific knowledge that has leaked across into drivers/pci/msi.[ch]. For example, the MSI capability basically defines just a message address register and a message data register. It does not define anything about the interpretation of either address or data. So all the stuff in struct msg_data and struct msg_address (vector, delivery_mode, level, trigger, dest_id, dest_mode, redirection_hint) looks to me like Intel-specific knowledge that should be encapsulated in the arch code. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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