#
# PCI configuration
#
-config PCI_MSI
- bool "Message Signaled Interrupts (MSI and MSI-X)"
- depends on (X86_LOCAL_APIC && X86_IO_APIC) || IA64
+config PCI_USE_VECTOR
+ bool "Vector-based interrupt indexing (MSI)"
+ depends on (X86_LOCAL_APIC && X86_IO_APIC && !X86_64) || IA64
default n
help
- This allows device drivers to enable MSI (Message Signaled
- Interrupts). Message Signaled Interrupts enable a device to
- generate an interrupt using an inbound Memory Write on its
- PCI bus instead of asserting a device IRQ pin.
+ This replaces the current existing IRQ-based index interrupt scheme
+ with the vector-base index scheme. The advantages of vector base
+ over IRQ base are listed below:
+ 1) Support MSI implementation.
+ 2) Support future IOxAPIC hotplug
+
+ Note that this allows the device drivers to enable MSI, Message
+ Signaled Interrupt, on all MSI capable device functions detected.
+ Message Signal Interrupt enables an MSI-capable hardware device to
+ send an inbound Memory Write on its PCI bus instead of asserting
+ IRQ signal on device IRQ pin.
If you don't know what to do here, say N.