Re: [PATCH 2/2] Initial generic hypertransport interrupt support.
- From: ebiederm@xxxxxxxxxxxx (Eric W. Biederman)
- Date: Tue, 11 Jul 2006 21:05:54 -0600
Andi Kleen <ak@xxxxxxx> writes:
ebiederm@xxxxxxxxxxxx (Eric W. Biederman) writes:
This patch implements two functions ht_create_irq and ht_destroy_irq
for use by drivers. Several other functions are implemented as helpers
for arch specific irq_chip handlers.
What do you want to use it for? Normally all HT configuration should be handled
by the BIOS and not messed with by the kernel.
I don't believe this is a typical HT configuration as you are thinking of it.
There is a hypertransport capability that implements a rough equivalent
of a per device ioapic. It is quite similar to MSI but with a different
register level interface.
Since native hypertransport devices do not implement a pin emulation mode
as native pci express devices do so if you want an interrupt you must support
the native hypertransport method.
The pathscale ipath-ht400 driver already in the kernel tree uses these
and uses so an ugly hack to make work that broke in the last round of
the msi cleanups. I also know of a driver under development for a
device that uses these as well.
So I want to use this so I can get irqs from native hypertransport
devices.
Eric
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