linux-kernel - Re: [PATCH V7 2/2] arm64: perf: add support for percpu pmu interrupt

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Date:	Thu, 12 Dec 2013 12:03:59 +0530
From:	Vinayak Kale <vkale@....com>
To:	Will Deacon <will.deacon@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"patches@....com" <patches@....com>,
	"jcm@...hat.com" <jcm@...hat.com>,
	"sboyd@...eaurora.org" <sboyd@...eaurora.org>,
	Marc Zyngier <Marc.Zyngier@....com>, Tuan Phan <tphan@....com>
Subject: Re: [PATCH V7 2/2] arm64: perf: add support for percpu pmu interrupt

Hi Will,

On Tue, Dec 10, 2013 at 1:00 PM, Vinayak Kale <vkale@....com> wrote:
> Hi Will,
>
>
> On Mon, Dec 9, 2013 at 10:20 PM, Will Deacon <will.deacon@....com> wrote:
>> Hi Vinayak,
>>
>> On Wed, Dec 04, 2013 at 10:09:51AM +0000, Vinayak Kale wrote:
>>> Add support for irq registration when pmu interrupt is percpu.
>>
>> Getting closer...
>>
>>> Signed-off-by: Vinayak Kale <vkale@....com>
>>> Signed-off-by: Tuan Phan <tphan@....com>
>>> ---
>>>  arch/arm64/kernel/perf_event.c |  108 +++++++++++++++++++++++++++++-----------
>>>  1 file changed, 78 insertions(+), 30 deletions(-)
>>>
>>> diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
>>> index cea1594..d8e6667 100644
>>> --- a/arch/arm64/kernel/perf_event.c
>>> +++ b/arch/arm64/kernel/perf_event.c
>>> @@ -22,6 +22,7 @@
>>>
>>>  #include <linux/bitmap.h>
>>>  #include <linux/interrupt.h>
>>> +#include <linux/irq.h>
>>>  #include <linux/kernel.h>
>>>  #include <linux/export.h>
>>>  #include <linux/perf_event.h>
>>> @@ -363,26 +364,52 @@ validate_group(struct perf_event *event)
>>>  }
>>>
>>>  static void
>>> +armpmu_disable_percpu_irq(void *data)
>>> +{
>>> +     disable_percpu_irq((long)data);
>>> +}
>>
>> Given that we wait for the CPUs to finish enabling/disabling the IRQ, I
>> actually meant pass the pointer to the IRQ, which removes the horrible
>> casts in the caller.
>>
>>> +     if (irq_is_percpu(irq)) {
>>> +             cpumask_clear(&armpmu->active_irqs);
>>
>> Thanks for moving the mask manipulation out. It now makes it obvious that we
>> don't care about the mask at all for PPIs, so that can be removed (the code
>> you have is racy against hotplug anyway).
>>
>> I took the liberty of writing a fixup for you (see below). Can you test it
>> on your platform please?
>
> Below fixup works fine on APM platform.
> Do you want me to send this fixup as part of next revision of the
> patch or will you apply it yourself? (For later case, you have my ack)

Any comments? Do I need to send the fix-up in next revision of patch?

Thanks
-Vinayak
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