On Thu, 2007-12-27 at 21:29 -0800, Lee Howard wrote: > Shaohua Li wrote: > > In IOAPIC mode, interrupt priority isn't related with the pin (in your > > case, irq 16 or 19), but the vector of the pin. How vector of a pin is > > allocated is quite random. Usually driver who calls pci_enable_device > > earier will get a lower priority vector. > > You used the words "random" and "usually". Could you elaborate on > the > randomness and when usually doesn't apply? > > So the means to prioritize a driver is to see that it gets installed > earlier? There is no other mechanism to "reserve" pin vector > allocations for a specific device or driver? Currently vector is allocated when pci_enable_device is called. So which vector is allocated depends on how many drivers already called the routine. The first vector is 0x31, later higher priority (higher) vector will be allocated. In latest kernel, a vector of a irq could be variable when irq affinity is set, so it's much complex. There is no existing method to reserve a vector for a device. Thanks, Shaohua - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
