linux-kernel - Re: [PATCH] perf/arm-cmn: Set PMU device parent

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Date: Thu, 11 Apr 2024 11:31:37 +0100
From: Will Deacon <will@...nel.org>
To: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Robin Murphy <robin.murphy@....com>, mark.rutland@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf/arm-cmn: Set PMU device parent

On Wed, Apr 10, 2024 at 06:12:26PM +0100, Jonathan Cameron wrote:
> On Wed, 10 Apr 2024 18:04:03 +0100
> Jonathan Cameron <Jonathan.Cameron@...wei.com> wrote:
> 
> > On Tue,  9 Apr 2024 18:15:17 +0100
> > Robin Murphy <robin.murphy@....com> wrote:
> > 
> > > Now that perf supports giving the PMU device a parent, we can use our
> > > platform device to make the relationship between CMN instances and PMU
> > > IDs trivially discoverable, from either nominal direction:
> > > 
> > > root@...zy-taxi:~# ls /sys/devices/platform/ARMHC600:00 | grep cmn
> > > arm_cmn_0
> > > root@...zy-taxi:~# realpath /sys/bus/event_source/devices/arm_cmn_0/..
> > > /sys/devices/platform/ARMHC600:00
> > > 
> > > Signed-off-by: Robin Murphy <robin.murphy@....com>  
> > Nice.  I'd forgotten all about this :( 
> > 
> > https://lore.kernel.org/all/20230404134225.13408-1-Jonathan.Cameron@huawei.com/
> > still has a bunch of these + there were many I never looked into.
> > 
> > Guess I should respin that series though probably 50% at least still apply.
> 
> Ironically other than this one, almost the only ones that didn't go in cleanly
> are the hisilicon drivers where there was some churn.
> 
> Will, if you 'want' to pick any of those up directly feel free, if not I'll sent
> them out again in a few days time (and check there weren't any requests for
> changes buried in that rather extensive thread!)

It's probably best to send a new series regardless, but I'm happy to
pick up anything touching drivers/perf/ if they don't depend on any core
changes.

Will