linux-kernel - [PATCH] perf, p4: Add format attributes

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Date:	Tue, 27 Mar 2012 16:50:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Lin Ming <ming.m.lin@...el.com>, rostedt <rostedt@...dmis.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH] perf, p4: Add format attributes

Subject: perf, p4: Add format attributes
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date: Tue Mar 27 16:19:25 CEST 2012

Steven reported his P4 not booting properly, the missing format
attributes cause a NULL ptr deref. Cure this by adding the missing
format specification.

I took the format description out of the comment near 
p4_config_pack*() and hope that comment is still relatively 
accurate.

Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
Cc: Lin Ming <ming.m.lin@...el.com>
Reported-by: Steven Rostedt <rostedt@...dmis.org>
Tested-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 arch/x86/kernel/cpu/perf_event_p4.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/arch/x86/kernel/cpu/perf_event_p4.c
+++ b/arch/x86/kernel/cpu/perf_event_p4.c
@@ -1271,6 +1271,17 @@ static int p4_pmu_schedule_events(struct
 	return num ? -EINVAL : 0;
 }
 
+PMU_FORMAT_ATTR(cccr, "config:0-31" );
+PMU_FORMAT_ATTR(escr, "config:32-62");
+PMU_FORMAT_ATTR(ht,   "config:63"   );
+
+static struct attribute *intel_p4_formats_attr[] = {
+	&format_attr_cccr.attr,
+	&format_attr_escr.attr,
+	&format_attr_ht.attr,
+	NULL,
+};
+
 static __initconst const struct x86_pmu p4_pmu = {
 	.name			= "Netburst P4/Xeon",
 	.handle_irq		= p4_pmu_handle_irq,
@@ -1305,6 +1316,8 @@ static __initconst const struct x86_pmu
 	 * the former idea is taken from OProfile code
 	 */
 	.perfctr_second_write	= 1,
+
+	.format_attrs		= intel_p4_formats_attr,
 };
 
 __init int p4_pmu_init(void)

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