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

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Date:	Wed, 04 Jul 2012 12:38:31 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jiri Olsa <jolsa@...hat.com>
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, 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;

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