From: Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
To: Russell King - ARM Linux <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>
Cc: Stephen Rothwell <sfr-3FnU+UHB4dNDw9hX6IcOSA@public.gmane.org>,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Rob Herring <rob.herring-bsGFqQB8/DxBDgjK7y7TUQ@public.gmane.org>,
Milton Miller <miltonm-ogEGBHC/i9Y@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH v3 00/25] irq_domain generalization and refinement
Date: Sun, 05 Feb 2012 11:01:05 +1100 [thread overview]
Message-ID: <1328400065.30631.9.camel@pasglop> (raw)
In-Reply-To: <20120204221748.GN14129-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
On Sat, 2012-02-04 at 22:17 +0000, Russell King - ARM Linux wrote:
> On Fri, Jan 27, 2012 at 02:35:54PM -0700, Grant Likely wrote:
> > Hey everyone,
> >
> > This patch series is ready for much wider consumption now. I'd like
> > to get it into linux-next ASAP because there will be ARM board support
> > depending on it. I'll wait a few days before I ask Stephen to pull
> > this in.
>
> Grant,
>
> Can you answer me this: does this irqdomain support require DT?
The original powerpc code this is based on didn't require it. It was an
explicit design decision and I remember insisting that Grant follows it,
but I haven't yet reviewed his last batch.
DT is orthogonal. You have "helpers" that use the DT to resolve the
domain of an interrupt source and do the mapping for you, but I made
sure that you call always still create domains and map interrupts using
explicit domain pointers & hw numbers.
(And I need them to deal with ancient broken device-tree's on some
platforms such as oldworld PowerMacs).
> The question comes up because OMAP has converted some of their support
> to require irq domain support for their PMICs, and it seems irq domain
> support requires DT. This seems to have made the whole of OMAP
> essentially become a DT-only platform.
.../...
> Now, here's the thing: I believe that IRQ domains - at least as far as
> the hwirq stuff - should be available irrespective of whether we have
> the rest of the IRQ domain support code in place, so that IRQ support
> code doesn't have to keep playing games to decode from the global
> space to the per-controller number space.
>
> I believe that would certainly help the current OMAP problems, where
> the current lack of CONFIG_IRQ_DOMAIN basically makes the kernel oops
> on boot.
>
> How we fix this regression for 3.4 I've no idea at present, I'm trying
> to work out what the real dependencies are for OMAP on this stuff.
>
> Finally, do we need asm/irq.h in our asm/prom.h ? That's causing
> fragility between DT and non-DT builds, because people are finding
> that their DT builds work without their mach/irqs.h includes but
> fail when built with non-DT. The only thing which DT might need -
> at the most - is NR_IRQS, but I'd hope with things like irq domains
> it doesn't actually require it.
Cheers,
Ben.
next prev parent reply other threads:[~2012-02-05 0:01 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-27 21:35 [PATCH v3 00/25] irq_domain generalization and refinement Grant Likely
2012-01-27 21:35 ` [PATCH v3 01/25] irq_domain: add documentation and MAINTAINERS entry Grant Likely
2012-01-28 18:23 ` Randy Dunlap
[not found] ` <4F243D2C.7040709-/UHa2rfvQTnk1uMJSBkQmQ@public.gmane.org>
2012-01-28 19:59 ` Grant Likely
2012-01-27 21:35 ` [PATCH v3 02/25] dt: Make irqdomain less verbose Grant Likely
2012-01-27 21:35 ` [PATCH v3 03/25] irq_domain: Make irq_domain structure match powerpc's irq_host Grant Likely
2012-01-27 21:35 ` [PATCH v3 04/25] irq_domain: convert microblaze from irq_host to irq_domain Grant Likely
2012-01-27 21:36 ` [PATCH v3 06/25] irq_domain/powerpc: eliminate irq_map; use irq_alloc_desc() instead Grant Likely
2012-01-27 21:36 ` [PATCH v3 07/25] irq_domain/powerpc: Eliminate virq_is_host() Grant Likely
2012-01-27 21:36 ` [PATCH v3 08/25] irq_domain: Move irq_domain code from powerpc to kernel/irq Grant Likely
2012-01-27 21:36 ` [PATCH v3 09/25] irqdomain: remove NO_IRQ from irq domain code Grant Likely
2012-01-27 21:36 ` [PATCH v3 10/25] irq_domain: Remove references to old irq_host names Grant Likely
2012-01-27 21:36 ` [PATCH v3 11/25] irq_domain: Replace irq_alloc_host() with revmap-specific initializers Grant Likely
2012-01-27 21:36 ` [PATCH v3 12/25] irq_domain: Add support for base irq and hwirq in legacy mappings Grant Likely
2012-01-27 21:36 ` [PATCH v3 13/25] irq_domain: Remove 'new' irq_domain in favour of the ppc one Grant Likely
[not found] ` <1327700179-17454-14-git-send-email-grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
2012-02-03 14:48 ` Cousson, Benoit
2012-02-03 16:42 ` Grant Likely
2012-01-27 21:36 ` [PATCH v3 14/25] irq_domain: Remove irq_domain_add_simple() Grant Likely
2012-01-31 12:45 ` Shawn Guo
2012-01-31 13:15 ` Rob Herring
2012-01-31 13:58 ` Shawn Guo
2012-02-01 0:08 ` Grant Likely
[not found] ` <1327700179-17454-15-git-send-email-grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
2012-02-01 5:46 ` [PATCH] irq_domain: fix the irq number of imx5 tzic Shawn Guo
2012-02-02 4:58 ` Grant Likely
2012-01-27 21:36 ` [PATCH v3 15/25] irq_domain: Create common xlate functions that device drivers can use Grant Likely
2012-01-27 21:36 ` [PATCH v3 16/25] irq_domain: constify irq_domain_ops Grant Likely
2012-01-27 21:36 ` [PATCH v3 17/25] irq_domain/c6x: Convert c6x to use generic irq_domain support Grant Likely
2012-01-27 21:36 ` [PATCH v3 18/25] irq_domain/c6x: constify irq_domain structures Grant Likely
2012-01-27 21:36 ` [PATCH v3 19/25] irq_domain/c6x: Use library of xlate functions Grant Likely
2012-01-27 21:36 ` [PATCH v3 20/25] irq_domain/powerpc: constify irq_domain_ops Grant Likely
2012-01-27 21:36 ` [PATCH v3 21/25] irqdomain/powerpc: Replace custom xlate functions with library functions Grant Likely
2012-02-06 5:22 ` Michael Neuling
[not found] ` <24476.1328505761-/owAOxkjmzZAfugRpC6u6w@public.gmane.org>
2012-02-06 6:00 ` Grant Likely
2012-01-27 21:36 ` [PATCH v3 22/25] irq_domain/x86: Convert x86 (embedded) to use common irq_domain Grant Likely
2012-01-28 16:44 ` Sebastian Andrzej Siewior
[not found] ` <20120128164405.GA20763-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
2012-01-29 0:35 ` Grant Likely
[not found] ` <20120129003550.GA21385-e0URQFbLeQY2iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2012-01-29 0:39 ` Grant Likely
2012-01-30 19:58 ` Grant Likely
[not found] ` <20120130195842.GT28397-e0URQFbLeQY2iJbIjFUEsiwD8/FfD2ys@public.gmane.org>
2012-02-01 14:17 ` Sebastian Andrzej Siewior
2012-02-01 18:06 ` Grant Likely
2012-02-23 19:56 ` Grant Likely
2012-02-23 21:22 ` Sebastian Andrzej Siewior
2012-02-23 21:39 ` Grant Likely
2012-01-27 21:36 ` [PATCH v3 23/25] irq_domain: Include hwirq number in /proc/interrupts Grant Likely
2012-01-27 21:36 ` [PATCH v3 24/25] irq_domain: remove "hint" when allocating irq numbers Grant Likely
[not found] ` <1327700179-17454-25-git-send-email-grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
2012-02-07 18:07 ` Nicolas Ferre
2012-02-15 15:04 ` Nicolas Ferre
2012-02-15 20:21 ` Grant Likely
2012-02-15 21:50 ` Shawn Guo
2012-02-16 5:32 ` Grant Likely
2012-02-16 6:03 ` Shawn Guo
2012-01-27 21:36 ` [PATCH v3 25/25] irq_domain: mostly eliminate slow-path revmap lookups Grant Likely
2012-02-15 16:36 ` Nicolas Ferre
2012-02-15 20:29 ` Grant Likely
2012-01-31 4:53 ` [PATCH v3 00/25] irq_domain generalization and refinement Olof Johansson
2012-02-01 0:07 ` Grant Likely
[not found] ` <1327700179-17454-1-git-send-email-grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
2012-01-27 21:35 ` [PATCH v3 05/25] irq_domain/powerpc: Use common irq_domain structure instead of irq_host Grant Likely
2012-01-28 18:38 ` [PATCH v3 00/25] irq_domain generalization and refinement Rob Herring
[not found] ` <4F2440A2.5080601-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2012-01-28 19:10 ` Grant Likely
2012-02-04 22:17 ` Russell King - ARM Linux
[not found] ` <20120204221748.GN14129-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-02-04 22:31 ` Russell King - ARM Linux
[not found] ` <20120204223125.GO14129-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org>
2012-02-05 1:38 ` Tony Lindgren
[not found] ` <20120205013853.GQ20333-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
2012-02-05 16:13 ` Russell King - ARM Linux
2012-02-07 15:26 ` Mark Brown
2012-02-15 20:33 ` Grant Likely
2012-02-05 0:01 ` Benjamin Herrenschmidt [this message]
2012-02-06 0:51 ` Rob Herring
2012-02-06 5:56 ` Grant Likely
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