Subject: Re: bge(4) interrupt handler fix for shared intr case
To: None <firstname.lastname@example.org>
From: Izumi Tsutsui <email@example.com>
Date: 11/27/2006 02:31:22
> I tried this several months ago. It seemed to cause problems. But
> I rewrote the code instead of using it directly from the Broadcom driver
> (I don't think OpenBSD had it at all then) so maybe I got it wrong.
Hmm. Was it shared interrupt case?
> I believe Jonathan also said that checking the BGE_PCI_PCISTAT
> register might be quite expensive.
The comment says checking BGE_MISC_LOCAL_CTL is expensive.
Is it also true for BGE_PCI_PCISTATE?
If interrupts are for bge(4) itself, bge_status is updated
in most case so BGE_PCI_PCISTATE is rarely checked.
If interrupts are not for bge(4), the register is checked
always, but is it more expensive than calling all unneeded
functions (and read/write against some registers) in handlers?