From: lee.jones@linaro.org (Lee Jones)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 15/15] ARM: perf: handle muxed CPU IRQ lines
Date: Wed, 20 Jun 2012 15:13:51 +0100 [thread overview]
Message-ID: <4FE1DA9F.30902@linaro.org> (raw)
In-Reply-To: <20120620140115.GJ32666@mudshark.cambridge.arm.com>
On 20/06/12 15:01, Will Deacon wrote:
> 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).
Okay, leave it with me.
I'm off now until Monday, I'll pick it up then.
Thanks Will.
--
Lee Jones
Linaro ST-Ericsson Landing Team Lead
M: +44 77 88 633 515
Linaro.org ? Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
prev parent reply other threads:[~2012-06-20 14:13 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
2012-06-20 14:13 ` Lee Jones [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4FE1DA9F.30902@linaro.org \
--to=lee.jones@linaro.org \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).