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| author | Natalie Protasevich <Natalie.Protasevich@unisys.com> | 2005-06-23 00:08:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-23 09:45:10 -0700 |
| commit | c434b7a6aedfe428ad17cd61b21b125a7b7a29ce (patch) | |
| tree | 1b1fb9d7279e715b765d8a4dd8a439166d68c516 /arch/i386/pci | |
| parent | b5d23e5b8c7ecd97d32f6ad7680d9909977580a7 (diff) | |
[PATCH] x86: avoid wasting IRQs for PCI devices
I have submitted the patch for x86_64, this is submission for i386.
The patch changes the way IRQs are handed out to PCI devices. Currently,
each I/O APIC pin gets associated with an IRQ, no matter if the pin is used
or not. This imposes severe limitation on systems that have designs that
employ many I/O APICs, only utilizing couple lines of each, such as P64H2
chipset. It is used in ES7000, and currently, there is no way to boot the
system with more that 9 I/O APICs.
The simple change below allows to boot a system with say 64 (or more) I/O
APICs, each providing 1 slot, which otherwise impossible because of the IRQ
gaps created for unused lines on each I/O APIC. It does not resolve the
problem with number of devices that exceeds number of possible IRQs, but
eases up a tension for IRQs on any large system with potentually large
number of devices.
Signed-off-by: Natalie Protasevich <Natalie.Protasevich@unisys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/pci')
0 files changed, 0 insertions, 0 deletions