From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 15/15] ARM: perf: handle muxed CPU IRQ lines
Date: Wed, 20 Jun 2012 15:01:16 +0100 [thread overview]
Message-ID: <20120620140115.GJ32666@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <4FE1D3D2.3050209@linaro.org>
On Wed, Jun 20, 2012 at 02:44:50PM +0100, Lee Jones wrote:
> >
> > Shouldn't this be in the platform IRQ handler, rather than the core v7 perf
> > code?
>
> Well that's where it currently resides, but in the process of DT:ing the
> platform, we have no real way to set the call-back. Normally, if it's
> absolutely necessary, we do this with AUXDATA. However in the PMU case
> we fall-down as a device address is required for DT look-up, which the
> PMU does not have.
Right, so I suspect this is going to be a huge problem for the OMAP guys,
where they have to do a fair amount of jiggery-pokery to kick their PMU into
action. We are also looking to put suspend/resume hooks into the
arm_pmu_platdata which will undoubtedly be highly platform-specific.
> I spoke with Arnd about sensible solutions and he suggested placing the
> logic inside the generic instead, thus supporting muxed IRQ lines
> without the requirement of providing a platform specific handler in
> every instance this occurs (although, I think the ux500 are the only
> platform to do this currently).
Whilst this code isn't too problematic (but yes, you are the only platform
that needs it) I think if we solve the bigger problem then you can use the
same solution to do your IRQ ping-ponging.
> I'd be happy to take any other suggestions, but this seemed fairly neat
> and unobtrusive (not withstanding the predicate cock-up).
Can we not fix the AUXDATA stuff to assume address 0 if it's not present for
the matching node? This will work for perf as I don't expect to have
multiple nodes with the same compatible string for PMUs that are not
memory-mapped (for big.LITTLE, the strings will be different).
Will
next prev parent reply other threads:[~2012-06-20 14:01 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-20 12:56 [PATCH 00/15] Device Tree related re-works and clean-ups Lee Jones
2012-06-20 12:56 ` [PATCH 01/15] mfd: Add IRQ domain support for the AB8500 Lee Jones
2012-06-29 14:51 ` Samuel Ortiz
2012-06-20 12:56 ` [PATCH 02/15] mfd: Generically describe interactions with the DB8500 PRCMU Lee Jones
2012-06-29 14:53 ` Samuel Ortiz
2012-06-20 12:56 ` [PATCH 03/15] mfd: Make MFD core code Device Tree and IRQ domain aware Lee Jones
2012-06-29 14:55 ` Samuel Ortiz
2012-06-29 14:52 ` Lee Jones
2012-06-29 18:49 ` Samuel Ortiz
2012-07-02 9:57 ` Lee Jones
2012-07-02 15:01 ` Samuel Ortiz
2012-06-20 12:56 ` [PATCH 04/15] mfd: ab8500: Register devices using the newly DT:ed MFD API Lee Jones
2012-06-29 15:09 ` Samuel Ortiz
2012-06-29 16:04 ` Lee Jones
2012-06-29 18:50 ` Samuel Ortiz
2012-07-02 10:03 ` Lee Jones
2012-07-02 15:14 ` Samuel Ortiz
2012-07-04 15:29 ` Lee Jones
2012-06-20 12:56 ` [PATCH 05/15] mfd: db8500-prcmu: " Lee Jones
2012-06-29 15:11 ` Samuel Ortiz
2012-06-20 12:56 ` [PATCH 06/15] mfd: Register the ab8500 from db8500-prcmu using the " Lee Jones
2012-06-29 15:15 ` Samuel Ortiz
2012-06-20 12:56 ` [PATCH 07/15] i2c: Add Device Tree support to the Nomadik I2C driver Lee Jones
2012-06-20 19:30 ` Linus Walleij
2012-06-21 6:47 ` Srinidhi Kasagar
2012-06-20 12:56 ` [PATCH 08/15] regulator: Stop initialising AB8500's registers during bring-up Lee Jones
2012-06-20 13:08 ` Mark Brown
2012-06-20 13:19 ` Lee Jones
2012-06-20 13:26 ` Mark Brown
2012-06-20 12:56 ` [PATCH 09/15] pinctrl: pinctrl-nomadik: Fix possible memory leak Lee Jones
2012-06-20 12:56 ` [PATCH 10/15] pinctrl: pinctrl-nomadik: Append sleepmode property with vendor specific prefixes Lee Jones
2012-06-20 12:56 ` [PATCH 11/15] ARM: ux500: Remove AB8500 regulator register initialisation information Lee Jones
2012-06-20 12:56 ` [PATCH 12/15] ARM: ux500: Ensure vendor specific properties have the vendor's identifier Lee Jones
2012-06-20 12:56 ` [PATCH 13/15] ARM: ux500: Remove temporary snowball_of_platform_devs enablement structure Lee Jones
2012-06-20 12:56 ` [PATCH 14/15] ARM: ux500: Remove PMU platform registration when booting with DT Lee Jones
2012-06-20 12:56 ` [PATCH 15/15] ARM: perf: handle muxed CPU IRQ lines Lee Jones
2012-06-20 13:28 ` Will Deacon
2012-06-20 13:44 ` Lee Jones
2012-06-20 14:01 ` Will Deacon [this message]
2012-06-20 14:13 ` Lee Jones
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