Date: Fri, 09 Nov 2007 19:59:20 +0100 From: Anders Gavare <gavare@gmail.com> To: freebsd-current@freebsd.org Subject: Re: device atpic to be deprecated? Message-ID: <1194634760.1749.9.camel@laptop>
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Hi currenters! On Wednesday 29 March 2006, John Baldwin wrote: > On Wednesday 29 March 2006 12:08, Scott Long wrote: > > John Baldwin wrote: > > On Wednesday 29 March 2006 11:26, Scott Long wrote: > .. > >> >>>>On Wed, Mar 29, 2006 at 02:05:27AM -0600, Conrad J. Sabatier > >> >>>>wrote: > > >>>>>Is the plan still in effect to abolish this device? > > >>>> > > >>>>To my mind it wouldn't make much sense, given the sheer amount > > >>>>of hardware out there which doesn't have an IOAPIC, then again > > >>>>I'm probably out of touch with the state of interrupt handling > > >>>>in -CURRENT. > > >>> > > >>>All amd64 machines (which is where atpic would be removed) have > > >>>an APIC. > > >> > > >>That's kind of like saying that ISA will be removed because there > > >>is PCI > > >>=-) Having an APIC doesn't necessarily guarantee that it works. > > >>There have been enough reports of problems on the mailing lists > > >>over time that I think it's a bit premature to declare the ATPIC > > >>dead. Also, is the ATPIC code in amd64 causing problems, holding > > >>back progress, or creating a maintenance burden? > > > > > > I think that once the lapic timer stuff was added almost all of > > > the APIC issues I was aware of went away on amd64 that were fixed > > > by using device atpic instead. Most of the earlier problems were > > > due to chipsets not setting up pin 0 as extint, etc. but all that > > > is no longer relevant when we switched to using the lapic timer > > > and stopped using irq0 and irq8 with APIC. This is the first I've > > > heard since the lapic timer stuff that APIC didn't work on an > > > amd64 box, and device atpic has been off by default in HEAD for > > > quite a while now. If we were able to require APIC on amd64, then > > > we might be able to try out some optimizations and other things I > > > haven't bothered with since they wouldn't be feasible on i386. > > > > Fine, remove it. > > I have to make sure it really works for everyone first though before > removing it would really be viable. :-/ The GENERIC 7.0-BETA2 kernel does not boot on my 1.8 GHz amd64 laptop (and HP Pavilion ze2000). Not in safe mode, not without ACPI, not without apic0/sio0/sio1 (which is the usual trick on this machine). After some detective work, however, I noticed that with "device atpic" added, 7.0-BETA2 works fine on this machine. (I took a chance and updated my sources from 6-STABLE to 7-STABLE, added the device, and now I am running 7.0-BETA2. If I hadn't already had FreeBSD installed, it would not have been possible to get it to boot, though, so this feels kind of critical.) My question is: Is it possible to add "device atpic" again in time for the 7.0 release? What is the possible negative impact of adding it? Anders
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