linux-kernel - Re: [PATCH 04/10] perf, x86: Making hardware events translations available in sysfs

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Date:	Wed, 4 Jul 2012 14:01:55 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	acme@...hat.com, mingo@...e.hu, paulus@...ba.org,
	cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com,
	eranian@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/10] perf, x86: Making hardware events translations
 available in sysfs

On Wed, Jul 04, 2012 at 12:38:31PM +0200, Peter Zijlstra wrote:
> On Wed, 2012-07-04 at 12:22 +0200, Peter Zijlstra wrote:
> > How about something like:
> > 
> >  u64 config = x86_pmu.event_map(_id);
> >  u64 event = (config & ARCH_PERFMON_EVENTSEL_EVENT) |
> >              (config & AMD64_EVENTSEL_EVENT) >> 24;
> >  u64 umask = (config & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
> > 
> >  WARN_ON_ONCE(config & (ARCH_PERFMON_EVENTSEL_INV |
> >                         ARCH_PERFMON_EVENTSEL_CMASK));
> > 
> >  sprintf("event=0x%02llx,umask=0x%02llx\n", event, umask); 
> 
> Oh wait, silly me, we actually need the inv and cmask too.
> 
> So that gets to be something like:
> 
>   u64 config = x86_pmu.event_map(_id);
>   u64 event = (config & ARCH_PERFMON_EVENTSEL_EVENT) |
>               (config & AMD64_EVENTSEL_EVENT) >> 24;
>   u64 umask = (config & ARCH_PERFMON_EVENTSEL_UMASK) >> 8;
>   u64 inv   = (config & ARCH_PERFMON_EVENTSEL_INV) >> 23;
>   u64 cmask = (config & ARCH_PERFMON_EVENTSEL_CMASK) >> 24;
>   ssize_t ret;
> 
>   ret = sprintf(page, "event=0x%02llx", event);
>   if (umask)
>     ret += sprintf(page + ret, ",umask=0x%02llx", umask);
>   if (inv)
>     ret += sprintf(page + ret, ",inv");
>   if (cmask)
>     ret += sprintf(page + ret, ",cmask=0x%02llx", cmask);
>   sprintf(page + ret, "\n");
>  
>   return ret;
> 

ok
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