From: grant.likely@secretlab.ca (Grant Likely)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v5 06/27] irq_domain/powerpc: eliminate irq_map; use irq_alloc_desc() instead
Date: Wed, 11 Apr 2012 14:57:07 -0600 [thread overview]
Message-ID: <20120411205707.68AC13E08B6@localhost> (raw)
In-Reply-To: <1334122182.2984.33.camel@pasglop>
On Wed, 11 Apr 2012 15:29:42 +1000, Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:
> On Wed, 2012-04-11 at 11:33 +1000, Benjamin Herrenschmidt wrote:
> > On Wed, 2012-04-11 at 11:13 +1000, Benjamin Herrenschmidt wrote:
> > > On Sat, 2012-04-07 at 14:27 +0200, Andreas Schwab wrote:
> > > > Benjamin Herrenschmidt <benh@kernel.crashing.org> writes:
> > > >
> > > > > It's arguable that this irq_set_irq_type(,NONE) shouln't be there but
> > > > > still ... it's been around for ever and things worked :-) So something
> > > > > -else- is causing the problem and I'd like to understand what exactly.
> > > >
> > > > AFAICS before a09b659cd68c10ec6a30cb91ebd2c327fcd5bfe5
> > > > irq_set_irq_type(,NONE) was actually a no-op.
> > >
> > > So I'm still a bit baffled... ie, I understand some of what's happening
> > > but not why it breaks things, I haven't yet managed to reproduce but I
> > > haven't tried too hard just yet (was away from the HW) :
> >
> > Allright, I have a repro-case, I'll dig.
>
> Ok, so it's Grant's fault :-)
I pretty much expected it would be. :-p
> So basically, it's quite subtle and I'm only 99% sure of the details but
> I believe what happens is:
>
> - The audio interrupts get virq 64 and 65 (so above NR_IRQS)
>
> - The reverse map isn't pre-filled at map time (we should probably do
> it nowadays), we do it lazily so ...
Hmmm... I though I had merged a patch that does that.
/me goes to look again...
Okay, I did write that patch, but I never merged it because it didn't
get much review and I was already nervous about the other irq_domain
changes. I'll post it again and ask for feedback.
> - The whole business with irq_virq_count needs fixing. Basically the
> default value shouldn't be NR_IRQ. I suggest making it 0 and have all
> the use sites do something like:
>
> max = irq_virq_count ? irq_virq_count : nr_irqs;
>
> (Grant, can you take care of that ?)
Yeah, I've got a different way to fix it though. There is exactly one
user of irq_virq_count in-tree right now: PS3. Also, irq_virq_count
is only useful for the NOMAP mapping. So, instead of having a single
global irq_virq_count values, I've dropped it entirely and added a
max_irq argument to irq_domain_add_nomap(). That makes it a property
of an individual nomap irq domain instead of a global system settting.
Hopefully I'll have a draft patch ready today.
g.
next prev parent reply other threads:[~2012-04-11 20:57 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-16 9:09 [PATCH v5 00/27] irq_domain generalization and rework Grant Likely
2012-02-16 9:09 ` [PATCH v5 01/27] irq_domain: add documentation and MAINTAINERS entry Grant Likely
2012-02-16 9:09 ` [PATCH v5 02/27] irq_domain: Be less verbose Grant Likely
2012-02-16 9:09 ` [PATCH v5 03/27] irq_domain: Make irq_domain structure match powerpc's irq_host Grant Likely
2012-02-16 9:09 ` [PATCH v5 04/27] irq_domain: convert microblaze from irq_host to irq_domain Grant Likely
2012-02-16 9:09 ` [PATCH v5 05/27] irq_domain/powerpc: Use common irq_domain structure instead of irq_host Grant Likely
2012-02-16 9:09 ` [PATCH v5 06/27] irq_domain/powerpc: eliminate irq_map; use irq_alloc_desc() instead Grant Likely
2012-04-01 21:27 ` Andreas Schwab
2012-04-02 4:21 ` Benjamin Herrenschmidt
2012-04-02 16:29 ` Andreas Schwab
2012-04-02 20:28 ` Grant Likely
2012-04-02 21:55 ` Russell King - ARM Linux
2012-04-02 22:33 ` Benjamin Herrenschmidt
2012-04-02 22:52 ` Russell King - ARM Linux
2012-04-02 23:38 ` Benjamin Herrenschmidt
2012-04-06 11:51 ` Andreas Schwab
2012-04-06 23:37 ` Benjamin Herrenschmidt
2012-04-07 12:27 ` Andreas Schwab
2012-04-11 1:13 ` Benjamin Herrenschmidt
2012-04-11 1:33 ` Benjamin Herrenschmidt
2012-04-11 5:29 ` Benjamin Herrenschmidt
2012-04-11 20:57 ` Grant Likely [this message]
2012-04-11 21:37 ` Benjamin Herrenschmidt
2012-04-11 21:47 ` Thomas Gleixner
2012-04-19 18:42 ` Grant Likely
2012-04-03 8:23 ` Thomas Gleixner
2012-04-03 8:20 ` Thomas Gleixner
2012-04-03 12:11 ` Andreas Schwab
2012-04-03 21:43 ` Benjamin Herrenschmidt
2012-04-04 12:51 ` Andreas Schwab
2012-04-04 15:40 ` Grant Likely
2012-04-05 10:51 ` Andreas Schwab
2012-04-06 11:12 ` Thomas Gleixner
2012-04-05 22:10 ` Andreas Schwab
2012-04-06 11:17 ` Thomas Gleixner
2012-04-06 11:25 ` Andreas Schwab
2012-04-06 11:28 ` Thomas Gleixner
2012-04-07 1:29 ` Grant Likely
2012-04-02 20:52 ` Thomas Gleixner
2012-04-02 21:20 ` Benjamin Herrenschmidt
2012-04-02 21:27 ` Thomas Gleixner
2012-04-02 22:32 ` Benjamin Herrenschmidt
2012-04-02 21:22 ` Andreas Schwab
2012-04-03 0:37 ` Benjamin Herrenschmidt
2012-02-16 9:09 ` [PATCH v5 07/27] irq_domain/powerpc: Eliminate virq_is_host() Grant Likely
2012-02-16 9:09 ` [PATCH v5 08/27] irq_domain: Move irq_domain code from powerpc to kernel/irq Grant Likely
2012-02-16 13:23 ` Grant Likely
2012-02-16 17:38 ` Cousson, Benoit
2012-02-16 17:52 ` Cousson, Benoit
2012-02-16 9:09 ` [PATCH v5 09/27] irq_domain: remove NO_IRQ from irq domain code Grant Likely
2012-02-16 9:09 ` [PATCH v5 10/27] irq_domain: Remove references to old irq_host names Grant Likely
2012-02-16 9:09 ` [PATCH v5 11/27] irq_domain: Replace irq_alloc_host() with revmap-specific initializers Grant Likely
2012-02-16 9:09 ` [PATCH v5 12/27] irq_domain: Add support for base irq and hwirq in legacy mappings Grant Likely
2012-02-16 9:09 ` [PATCH v5 13/27] of/address: add empty static inlines for !CONFIG_OF Grant Likely
2012-02-16 9:09 ` [PATCH v5 14/27] mfd: twl-core.c: Fix the number of interrupts managed by twl4030 Grant Likely
2012-02-16 9:09 ` [PATCH v5 15/27] irq_domain: Remove 'new' irq_domain in favour of the ppc one Grant Likely
2012-02-16 9:09 ` [PATCH v5 16/27] irq_domain: Remove irq_domain_add_simple() Grant Likely
2012-02-16 9:09 ` [PATCH v5 17/27] irq_domain: Create common xlate functions that device drivers can use Grant Likely
2012-02-16 9:09 ` [PATCH v5 18/27] irq_domain: constify irq_domain_ops Grant Likely
2012-02-16 9:09 ` [PATCH v5 19/27] irq_domain/c6x: Convert c6x to use generic irq_domain support Grant Likely
2012-02-16 9:09 ` [PATCH v5 20/27] irq_domain/c6x: constify irq_domain structures Grant Likely
2012-02-21 15:47 ` Mark Salter
2012-02-16 9:09 ` [PATCH v5 21/27] irq_domain/c6x: Use library of xlate functions Grant Likely
2012-02-21 15:48 ` Mark Salter
2012-02-16 9:09 ` [PATCH v5 22/27] irq_domain/powerpc: constify irq_domain_ops Grant Likely
2012-02-16 9:09 ` [PATCH v5 23/27] irq_domain/powerpc: Replace custom xlate functions with library functions Grant Likely
2012-02-16 9:09 ` [PATCH v5 24/27] irq_domain/microblaze: Convert microblaze to use irq_domains Grant Likely
2012-02-16 9:09 ` [PATCH v5 25/27] irq_domain: remove "hint" when allocating irq numbers Grant Likely
2012-02-16 9:09 ` [PATCH v5 26/27] irq_domain: mostly eliminate slow-path revmap lookups Grant Likely
2012-02-16 9:09 ` [PATCH v5 27/27] irq_domain: For NOMAP revmap, allow users to specify the largest usable virq Grant Likely
2012-02-16 22:52 ` [PATCH v5 00/27] irq_domain generalization and rework Andrew Morton
2012-02-16 23:26 ` Russell King - ARM Linux
2012-02-17 18:05 ` Sam Ravnborg
2012-02-17 17:42 ` Cousson, Benoit
2012-02-17 17:55 ` Russell King - ARM Linux
2012-02-21 14:51 ` Cousson, Benoit
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