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

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Date:	Wed, 04 Jul 2012 12:22:10 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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 00:00 +0200, Jiri Olsa wrote:
> +#define PMU_EVENTS_ATTR_CONFIG(_name, _id)                             \
> +static ssize_t                                                         \
> +_name##_show(struct device *dev,                                       \
> +                          struct device_attribute *attr,               \
> +                          char *page)                                  \
> +{                                                                      \
> +       u64 val = x86_pmu.event_map(_id);                               \
> +       BUILD_BUG_ON(_id >= PERF_COUNT_HW_MAX);                         \
> +       return sprintf(page, "config=0x%llx\n", val);                   \
> +}                                                                      \ 

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);




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