[IA64] vector sharing (Large I/O system support)
authorKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Mon, 25 Apr 2005 20:26:23 +0000 (13:26 -0700)
committerTony Luck <tony.luck@intel.com>
Mon, 25 Apr 2005 20:26:23 +0000 (13:26 -0700)
commit24eeb568aeeaee771b9f0a6fd6f5d01040a887da
tree4d3e731845cde292b5a40ff7db97cce639dc073c
parente927ecb05e1ce4bbb1e10f57008c94994e2160f5
[IA64] vector sharing (Large I/O system support)

Current ia64 linux cannot handle greater than 184 interrupt sources
because of the lack of vectors. The following patch enables ia64 linux
to handle greater than 184 interrupt sources by allowing the same
vector number to be shared by multiple IOSAPIC's RTEs. The design of
this patch is besed on "Intel(R) Itanium(R) Processor Family Interrupt
Architecture Guide".

Even if you don't have a large I/O system, you can see the behavior of
vector sharing by changing IOSAPIC_LAST_DEVICE_VECTOR to fewer value.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
arch/ia64/kernel/iosapic.c
arch/ia64/kernel/irq_ia64.c
include/asm-ia64/hw_irq.h