[Q] cPCI hotplugging

[Q] cPCI hotplugging

[Eric]

Hi folks,

I was referred to this group by an article at lwn.net, and
it seems that some pretty exciting stuff is going on here.

My question is whether or not this list is concerning itself
with PCI (non-cardbus) hotplug, or simply focusing (for now)
on USB, FireWire and Cardbus.  If so, is there any preliminary
documentation on this subsystem (the webpage is understandably
sparse at this time)?

I have been working with a Sun CP1400/1500 CompactPCI box and
it would be most excellent to look into CompactPCI hotplugging.

Thanks for the update,
E

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Re: [Q] cPCI hotplugging

[Matthew Dharm]

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Well, if we aren't already concerning ourselves with cPCI, we should be.
My day job is with a company that designs and manufactures cPCI and VME
boards, and we're porting Linux to our systems.

There's certainly demand for this sort of support.  I think it's definately
something we should consider.

Matt

On Mon, Jan 15, 2001 at 10:21:29AM -0800, Eric wrote:
> Hi folks,
> 
> I was referred to this group by an article at lwn.net, and
> it seems that some pretty exciting stuff is going on here.
> 
> My question is whether or not this list is concerning itself
> with PCI (non-cardbus) hotplug, or simply focusing (for now)
> on USB, FireWire and Cardbus.  If so, is there any preliminary
> documentation on this subsystem (the webpage is understandably
> sparse at this time)?
> 
> I have been working with a Sun CP1400/1500 CompactPCI box and
> it would be most excellent to look into CompactPCI hotplugging.
> 
> Thanks for the update,
> E
> 
> ____________________________________________________________________
> Get free email and a permanent address at http://www.netaddress.com/?N=1
> 
> _______________________________________________
> Linux-hotplug-devel mailing list
> Linux-hotplug-devel@lists.sourceforge.net
> http://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel

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Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

Umm, these aren't the droids you're looking for.
					-- Bill Gates
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Re: [Q] cPCI hotplugging

[David Brownell]

I think the rule of thumb is that if you want it to happen,
start to make it happen!

How would CompactPCI hotplugging work differently?  Knowing
exactly nothing about it, I'd hope that not much was needed.
But maybe there is a codepath that only Cardbus triggers, so
far, and that'd need to kick in.

It's linux/drivers/pci/pci.c that issues call_usermodehelper(),
which is pretty generic.  If cPCI called that, it might "just
work".  If you try the latest hotplug script (with a PCI
agent) does anything happen?

- Dave



----- Original Message ----- 
From: Eric <ebrower@usa.net>
To: <linux-hotplug-devel@lists.sourceforge.net>
Sent: Monday, January 15, 2001 10:21 AM
Subject: [Q] cPCI hotplugging


Hi folks,

I was referred to this group by an article at lwn.net, and
it seems that some pretty exciting stuff is going on here.

My question is whether or not this list is concerning itself
with PCI (non-cardbus) hotplug, or simply focusing (for now)
on USB, FireWire and Cardbus.  If so, is there any preliminary
documentation on this subsystem (the webpage is understandably
sparse at this time)?

I have been working with a Sun CP1400/1500 CompactPCI box and
it would be most excellent to look into CompactPCI hotplugging.

Thanks for the update,
E

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Linux-hotplug-devel@lists.sourceforge.net
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Re: [Q] cPCI hotplugging

[Scott Laird]

On Mon, 15 Jan 2001, David Brownell wrote:
> 
> How would CompactPCI hotplugging work differently?  Knowing
> exactly nothing about it, I'd hope that not much was needed.
> But maybe there is a codepath that only Cardbus triggers, so
> far, and that'd need to kick in.

On a related note, has anyone looked at Compaq's PCI Hotplugging?  I know
that Intel has licensed Compaq's design for some of their own server
boards, but I haven't been able to find enough documentation to actually
write any code.


Scott


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RE: [Q] cPCI hotplugging

[Zink, Dan]

Funny you should ask...  We have developed a driver for the Compaq PCI
Hot Plug Controller that we will be releasing in the next week or two.

Our SourceForge site is at:
http://opensource.compaq.com/sourceforge/project/?group_id\x13

I'll be posting a notice to this list when we get the source up there.

Dan


-----Original Message-----
From: Scott Laird [mailto:laird@internap.com]
Sent: Monday, January 15, 2001 4:48 PM
To: David Brownell
Cc: Eric; linux-hotplug-devel@lists.sourceforge.net
Subject: Re: [Q] cPCI hotplugging




On Mon, 15 Jan 2001, David Brownell wrote:
> 
> How would CompactPCI hotplugging work differently?  Knowing
> exactly nothing about it, I'd hope that not much was needed.
> But maybe there is a codepath that only Cardbus triggers, so
> far, and that'd need to kick in.

On a related note, has anyone looked at Compaq's PCI Hotplugging?  I know
that Intel has licensed Compaq's design for some of their own server
boards, but I haven't been able to find enough documentation to actually
write any code.


Scott


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Re: [Q] cPCI hotplugging

[Miles Lane]

Zink, Dan wrote:

> Funny you should ask...  We have developed a driver for the Compaq PCI
> Hot Plug Controller that we will be releasing in the next week or two.
> 
> Our SourceForge site is at:
> http://opensource.compaq.com/sourceforge/project/?group_id\x13
> 
> I'll be posting a notice to this list when we get the source up there.

So, Dan,

In Scott's initial note on the topic, he mentioned that cPCI is a
hotplugging bus.  You may or may not have heard about the recent
hotplug developments in the 2.4.0 series kernel.  If you already
know about it, do you have any idea how your new driver will
mesh, if at all, with the new hotplug infrastructure?

	Miles


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Re: [Q] cPCI hotplugging

[Matthew Dharm]

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Umm... I just want to make sure we're all on the same page, because Miles'
e-mail sounds like he _might_ be confused.

cPCI != Compaq PCI

cPCI == Compact PCI, which is a hot-swappable bus archetecture (and cabinet
design, and card form factors, and...)

cPCI has no controller.  It's not a controller spec.  It's a bus and
physical spec.  Tho the Compaq PCI controller may give you many of the same
benefits as a real cPCI system.

cPCI is really just PCI, at 33/66MHz and 32/64 bits wide.  It supports
insertion notification, and removal request (open the latches, allow the
software to shutdown and turn off the LED, then remove the board).

Taking the 2 second look at the web page, it looks like they're working on
both infrastructure for PCI Hot Plug, as well as a driver for the Compaq
controller for this thing.  I don't know much about this controler, but I'm
certainly interested in the infrastructure parts.

Matt

On Tue, Jan 16, 2001 at 10:54:45AM -0800, Miles Lane wrote:
> Zink, Dan wrote:
> 
> > Funny you should ask...  We have developed a driver for the Compaq PCI
> > Hot Plug Controller that we will be releasing in the next week or two.
> > 
> > Our SourceForge site is at:
> > http://opensource.compaq.com/sourceforge/project/?group_id=13
> > 
> > I'll be posting a notice to this list when we get the source up there.
> 
> So, Dan,
> 
> In Scott's initial note on the topic, he mentioned that cPCI is a
> hotplugging bus.  You may or may not have heard about the recent
> hotplug developments in the 2.4.0 series kernel.  If you already
> know about it, do you have any idea how your new driver will
> mesh, if at all, with the new hotplug infrastructure?
> 
> 	Miles

-- 
Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

What, are you one of those Microsoft-bashing Linux freaks?
					-- Customer to Greg
User Friendly, 2/10/1999

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RE: [Q] cPCI hotplugging

[Zink, Dan]

To answer Miles' question, I am aware of the /sbin/hotplug stuff that was
added but hadn't given it a whirl yet.  It ought to tie in nicely.  We
did most of our development prior to the appearance of /sbin/hotplug so
we have another usermode notification method for synchronization with
the PCI Hot Plug GUI we've written.  In addition, our GUI uses the kudzu
database to find drivers and allow the user to load them.  That should
be unnecessary if /sbin/hotplug does the right thing.

As for the rest of the "infrastructure" work we've done, some of it is
support that could be applied to any PCI hot plug driver.  Some could
be applied to the kernel's PCI configuration routines.

Dan

-----Original Message-----
From: Matthew Dharm [mailto:mdharm-usb@one-eyed-alien.net]
Sent: Tuesday, January 16, 2001 3:19 PM
To: Miles Lane
Cc: Zink, Dan; 'Scott Laird'; David Brownell; Eric;
linux-hotplug-devel@lists.sourceforge.net
Subject: Re: [Q] cPCI hotplugging


Umm... I just want to make sure we're all on the same page, because Miles'
e-mail sounds like he _might_ be confused.

cPCI != Compaq PCI

cPCI = Compact PCI, which is a hot-swappable bus archetecture (and cabinet
design, and card form factors, and...)

cPCI has no controller.  It's not a controller spec.  It's a bus and
physical spec.  Tho the Compaq PCI controller may give you many of the same
benefits as a real cPCI system.

cPCI is really just PCI, at 33/66MHz and 32/64 bits wide.  It supports
insertion notification, and removal request (open the latches, allow the
software to shutdown and turn off the LED, then remove the board).

Taking the 2 second look at the web page, it looks like they're working on
both infrastructure for PCI Hot Plug, as well as a driver for the Compaq
controller for this thing.  I don't know much about this controler, but I'm
certainly interested in the infrastructure parts.

Matt

On Tue, Jan 16, 2001 at 10:54:45AM -0800, Miles Lane wrote:
> Zink, Dan wrote:
> 
> > Funny you should ask...  We have developed a driver for the Compaq PCI
> > Hot Plug Controller that we will be releasing in the next week or two.
> > 
> > Our SourceForge site is at:
> > http://opensource.compaq.com/sourceforge/project/?group_id\x13
> > 
> > I'll be posting a notice to this list when we get the source up there.
> 
> So, Dan,
> 
> In Scott's initial note on the topic, he mentioned that cPCI is a
> hotplugging bus.  You may or may not have heard about the recent
> hotplug developments in the 2.4.0 series kernel.  If you already
> know about it, do you have any idea how your new driver will
> mesh, if at all, with the new hotplug infrastructure?
> 
> 	Miles

-- 
Matthew Dharm                              Home:
mdharm-usb@one-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

What, are you one of those Microsoft-bashing Linux freaks?
					-- Customer to Greg
User Friendly, 2/10/1999

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Re: [Q] cPCI hotplugging

[David Brownell]

Dan, is your "Hotplug PCI" related to some of the original
PCI driver API updates ("new style") done way early in the
2.3 timeframe?  That seemed never to have had followon to
complete it (user mode tools like /sbin/hotplug, cardctl).
I had been asking, but nobody knew of any ... :-)

I'd also be interested in any thoughts you might have about
when users should deal with a GUI, vs have such issues
be fully automated.  For example, I'd expect laptop users
would never want a GUI unless that PCI (Cardbus) device
has never been seen before ... while at least some server
admins might feel "safer" with lots of manual controls.

- Dave



----- Original Message -----
From: Zink, Dan <Dan.Zink@COMPAQ.com>
To: 'Matthew Dharm' <mdharm-usb@one-eyed-alien.net>; Miles Lane <miles@megapathdsl.net>
Cc: 'Scott Laird' <laird@internap.com>; David Brownell <david-b@pacbell.net>; Eric
<ebrower@usa.net>; <linux-hotplug-devel@lists.sourceforge.net>
Sent: Tuesday, January 16, 2001 2:30 PM
Subject: RE: [Q] cPCI hotplugging


> To answer Miles' question, I am aware of the /sbin/hotplug stuff that was
> added but hadn't given it a whirl yet.  It ought to tie in nicely.  We
> did most of our development prior to the appearance of /sbin/hotplug so
> we have another usermode notification method for synchronization with
> the PCI Hot Plug GUI we've written.  In addition, our GUI uses the kudzu
> database to find drivers and allow the user to load them.  That should
> be unnecessary if /sbin/hotplug does the right thing.
>
> As for the rest of the "infrastructure" work we've done, some of it is
> support that could be applied to any PCI hot plug driver.  Some could
> be applied to the kernel's PCI configuration routines.
>
> Dan
>
> -----Original Message-----
> From: Matthew Dharm [mailto:mdharm-usb@one-eyed-alien.net]
> Sent: Tuesday, January 16, 2001 3:19 PM
> To: Miles Lane
> Cc: Zink, Dan; 'Scott Laird'; David Brownell; Eric;
> linux-hotplug-devel@lists.sourceforge.net
> Subject: Re: [Q] cPCI hotplugging
>
>
> Umm... I just want to make sure we're all on the same page, because Miles'
> e-mail sounds like he _might_ be confused.
>
> cPCI != Compaq PCI
>
> cPCI = Compact PCI, which is a hot-swappable bus archetecture (and cabinet
> design, and card form factors, and...)
>
> cPCI has no controller.  It's not a controller spec.  It's a bus and
> physical spec.  Tho the Compaq PCI controller may give you many of the same
> benefits as a real cPCI system.
>
> cPCI is really just PCI, at 33/66MHz and 32/64 bits wide.  It supports
> insertion notification, and removal request (open the latches, allow the
> software to shutdown and turn off the LED, then remove the board).
>
> Taking the 2 second look at the web page, it looks like they're working on
> both infrastructure for PCI Hot Plug, as well as a driver for the Compaq
> controller for this thing.  I don't know much about this controler, but I'm
> certainly interested in the infrastructure parts.
>
> Matt
>
> On Tue, Jan 16, 2001 at 10:54:45AM -0800, Miles Lane wrote:
> > Zink, Dan wrote:
> >
> > > Funny you should ask...  We have developed a driver for the Compaq PCI
> > > Hot Plug Controller that we will be releasing in the next week or two.
> > >
> > > Our SourceForge site is at:
> > > http://opensource.compaq.com/sourceforge/project/?group_id\x13
> > >
> > > I'll be posting a notice to this list when we get the source up there.
> >
> > So, Dan,
> >
> > In Scott's initial note on the topic, he mentioned that cPCI is a
> > hotplugging bus.  You may or may not have heard about the recent
> > hotplug developments in the 2.4.0 series kernel.  If you already
> > know about it, do you have any idea how your new driver will
> > mesh, if at all, with the new hotplug infrastructure?
> >
> > Miles
>
> --
> Matthew Dharm                              Home:
> mdharm-usb@one-eyed-alien.net
> Maintainer, Linux USB Mass Storage Driver
>
> What, are you one of those Microsoft-bashing Linux freaks?
> -- Customer to Greg
> User Friendly, 2/10/1999


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