linux-kernel - Re: [PATCH 2/4] perf/x86: Fix format definition of SNB-EP uncore QPI box

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Date:	Mon, 23 Jul 2012 18:33:35 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	a.p.zijlstra@...llo.nl, mingo@...e.hu, andi@...stfloor.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] perf/x86: Fix format definition of SNB-EP uncore QPI box

On Mon, Jul 23, 2012 at 8:23 AM, Yan, Zheng <zheng.z.yan@...el.com> wrote:
> From: "Yan, Zheng" <zheng.z.yan@...el.com>
>
> The event control register of SNB-EP uncore QPI box has a one bit
> extension at bit position 21.
>
> Reported-by: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Yan, Zheng <zheng.z.yan@...el.com>
> ---
>  arch/x86/kernel/cpu/perf_event_intel_uncore.c |   23 ++++++++++++++++++++++-
>  arch/x86/kernel/cpu/perf_event_intel_uncore.h |    4 ++++
>  2 files changed, 26 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore.c b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> index a5de59f..305e603 100644
> --- a/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> +++ b/arch/x86/kernel/cpu/perf_event_intel_uncore.c
> @@ -21,6 +21,7 @@ DEFINE_UNCORE_FORMAT_ATTR(event, event, "config:0-7");
>  DEFINE_UNCORE_FORMAT_ATTR(umask, umask, "config:8-15");
>  DEFINE_UNCORE_FORMAT_ATTR(edge, edge, "config:18");
>  DEFINE_UNCORE_FORMAT_ATTR(tid_en, tid_en, "config:19");
> +DEFINE_UNCORE_FORMAT_ATTR(ev_sel_ext, ev_sel_ext, "config:21");

I would not have done it that way. I would have done:

DEFINE_UNCORE_FORMAT_ATTR(event, event, "config:0-7,21");

Assuming the event parser supports disjoint bits. For QPI, I think
the event code is actually 9 bits wide. I will check on this some more.
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