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into its own file: - All of the $PIR interrupt routing is now done in a link-centric fashion. When a host-PCI bridge that uses the $PIR attaches, it calls pir_parse() to parse the table. This scans for link devices and merges all the masks for each link device from the table entries. It then looks at the intline register of PCI devices connected to a link to figure out if the BIOS has routed this link and if so to which IRQ. - The IRQ for any given link can be overridden via a hint like so: 'hw.pci.link.0x62.irq=10' Any IRQ set in this matter is treated as if it were set that way by the BIOS. - We only call the BIOS to route each link device once. - When a PCI device wants to route an interrupt, we look it up in the $PIR to find the associated link. If the link is routed, we simply return the IRQ it is using. If it is not routed, we have to pick one. This uses a different algorithm from the old code. First off, when we try to pick an interrupt from a mask of possible interrupts, we try to pick the one that is least loaded as far as PCI devices. We maintain this weight based on the number of devices attached to each link device. When choosing an IRQ, we first attempt to route using any PCI only interrupts (the old code did this as well). If that doesn't work, we try to use the list of IRQs that the BIOS has used. This is a new step that the new code didn't do and avoids using IRQ 3 or 4 for every virgin interrupt routing. If none of the IRQs that the BIOS used worked, then we fall back to trying anything. - The fallback mask for !PC98 was fixed to include IRQ 3 and not allow IRQ 2. - We don't use the $PIR to route interrupts on a PCI-PCI bridge unless it has already been used to route on at least one Host-PCI bridge. This helps to avoid mixing and matching x86 firmware PCI interrupt routing methods (which is a Bad Thing(tm)). Silence on: current@
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