[PATCH 0/4 V3] irqchip: gic: Introduce ARM GICv2m MSI(-X) support

[Jason Cooper]

On Fri, Jul 18, 2014 at 10:02:05AM +0100, Mark Rutland wrote:
> On Thu, Jul 17, 2014 at 03:12:35PM +0100, Jason Cooper wrote:
> > On Thu, Jul 17, 2014 at 02:55:34PM +0100, Mark Rutland wrote:
> > > Hi Jason,
> > > 
> > > On Thu, Jul 17, 2014 at 02:18:54PM +0100, Jason Cooper wrote:
> > > > On Wed, Jul 09, 2014 at 06:05:00PM -0500, suravee.suthikulpanit at amd.com wrote:
> > > > > From: Suravee Suthikulpanit <Suravee.Suthikulpanit at amd.com>
> > > > > 
> > > > > This patch set introduces support for MSI(-X) in GICv2m specification,
> > > > > which is implemented in some variation of GIC400.
> > > > > 
> > > > > This depends on and has been tested with the V7 of"Add support for PCI in AArch64"
> > > > > (https://lkml.org/lkml/2014/3/14/320).
> > > > > 
> > > > > Changes in V3:
> > > > >     * Rebase to git://git.infradead.org/users/jcooper/linux.git irqchip/gic
> > > > >       (per Jason Cooper request)
> > > > >     * Misc fix/clean up per Mark Rutland comments
> > > > >     * Minor Clean up in the driver/irqchip/irq-gic-v2m.c: alloc_msi_irqs()
> > > > >     * Patch 4 is new to the series:
> > > > >         * Add ARM64-specific version arch_setup_msi_irqs() to allow support
> > > > >           for Multiple MSI.
> > > > >         * Add support for Multiple MSI for GICv2m.
> > > > > 
> > > > > Suravee Suthikulpanit (4):
> > > > >   irqchip: gic: Add binding probe for ARM GIC400
> > > > >   irqchip: gic: Restructuring ARM GIC code
> > > > >   irqchip: gic: Add supports for ARM GICv2m MSI(-X)
> > > > >   irqchip: gicv2m: Add support for multiple MSI for ARM64 GICv2m
> > > > 
> > > > Ok, patch #1 applied to irqchip/urgent.  Patches 2 and 3 applied to
> > > > irqchip/gic with irqchip/urgent merged in.  To facilitate
> > > > testing/merging, I've prepared an unsigned tag for you on the
> > > > irqchip/gic branch:
> > > 
> > > I'm a little concerned that this is all going through for v3.17 without
> > > a {Reviewed,Acked}-by from Marc or anyone working with GIC{,v2m}.
> > 
> > Well, that's why it's not in irqchip/core yet. ;-)  It can be undone if
> > needed.
> 
> Ah, perhaps I was a litte premature. :)
>  
> > > While his comments on v1 have been addressed, he has not had a chance to
> > > acknowledge the solutions. I appreciate Marc's holiday is unfortunately
> > > timed.
> > > 
> > > I also have an open concern with the binding with regard to the
> > > orthogonality of GICV GICH and the MSI registers.
> > > 
> > > Suravee, do you need this urgently for v3.17? I was under the impression
> > > that we wouldn't have full PCIe support by then.
> > 
> > If Suravee is ok with it, I can drop them for now and he can resend for
> > v3.18.  Since we've worked out a way to merge it all in one window, I
> > don't think it would hurt anything to wait.
> 
> Ok.
> 
> > I'll leave these in irqchip/for-next until I hear from Suravee, then
> > I'll drop the lot till we hear from Marc and look at the timing.
> 
> Keeping it in for-next for testing sounds like a good idea, but until we
> hear from Marc I wouldn't want to see this queued for mainline. So the
> above sounds fine to me.

Ok, here's what I did:

[jason at triton] $ git ldo --graph v3.16-rc1^..irqchip/gic-v2m
* 3e44358c12cc (HEAD, irqchip/gic-v2m) irqchip: gic: Add support for ARM GICv2m MSI(-X)
* fe7ac63fe539 irqchip: gic: Restructuring ARM GIC code
*   6bf0be3f077e Merge branch 'irqchip/urgent' into irqchip/gic
|\  
| * 144cb08864ed (irqchip/urgent) irqchip: gic: Add binding probe for ARM GIC400
| * a97e8027b1d2 irqchip: gic: Add support for cortex a7 compatible string
| * 4f4366033945 (tag: irqchip-urgent-3.16) irqchip: spear_shirq: Fix interrupt offset
| * 00ac20279174 irqchip: brcmstb-l2: Level-2 interrupts are edge sensitive
| * b73842b75646 irqchip: armada-370-xp: Mask all interrupts during initialization.
* | 021f653791ad (tag: deps-irqchip-gic-3.17, irqchip/gic) irqchip: gic-v3: Initial support for GICv3
* | d51d0af43b30 irqchip: gic: Move some bits of GICv2 to a library-type file
|/  
* 7171511eaec5 (tag: v3.16-rc1) Linux 3.16-rc1

remote branches removed for clarity.

Basically, I reset irqchip/gic back to tags/deps-irqchip-gic-3.17 (The
stable tag for GICv3 support), and made the MSI series irqchip/gic-v2m.

I've also removed the dep tag for gic-v2m (tags/dep-irqchip-gic-3.17-2).
Please consider irqchip/gic-v2m to be completely unstable and drop-able.
It'll be in -next, but until I hear from Marc, it's not going anywhere.

No commit IDs have changed during this process.  The only problem that
may occur is if the guys depending on GICv3 pulled the branch *and*
updated it yesterday.  If they pulled the tag as I provided, then
they're fine.

Sorry for the confusion, I hope I've made it clear above.

thx,

Jason.
> 
> Cheers,
> Mark.