linux-kernel - [PATCH] oprofile: Allow setting EDGE/INV/CMASK for Intel counter events

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Message-Id: <1299870748-13319-1-git-send-email-andi@firstfloor.org>
Date:	Fri, 11 Mar 2011 11:12:28 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	robert.richter@....com
Cc:	linux-kernel@...r.kernel.org, oprofile-list@...ts.sf.net,
	Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH] oprofile: Allow setting EDGE/INV/CMASK for Intel counter events

From: Andi Kleen <ak@...ux.intel.com>

For some performance events it's useful to set the EDGE and INV
bits and the CMASK mask in the counter control register. The list
of predefined events Intel releases for each CPU has some events which
require these settings to get more "natural" to use higher level events.

oprofile currently doesn't allow this.

This patch adds new extra configuration fields for them, so that
they can be specified in oprofilefs.

An updated oprofile daemon can then make use of this to set them.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/oprofile/nmi_int.c    |    4 ++++
 arch/x86/oprofile/op_counter.h |    1 +
 2 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index e2b7b0c..bace252 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -49,6 +49,9 @@ u64 op_x86_get_ctrl(struct op_x86_model_spec const *model,
 	val |= counter_config->user ? ARCH_PERFMON_EVENTSEL_USR : 0;
 	val |= counter_config->kernel ? ARCH_PERFMON_EVENTSEL_OS : 0;
 	val |= (counter_config->unit_mask & 0xFF) << 8;
+	val |= counter_config->extra & (ARCH_PERFMON_EVENTSEL_INV|
+					ARCH_PERFMON_EVENTSEL_EDGE|
+					ARCH_PERFMON_EVENTSEL_CMASK);
 	event &= model->event_mask ? model->event_mask : 0xFF;
 	val |= event & 0xFF;
 	val |= (event & 0x0F00) << 24;
@@ -440,6 +443,7 @@ static int nmi_create_files(struct super_block *sb, struct dentry *root)
 		oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
 		oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
 		oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
+		oprofilefs_create_ulong(sb, dir, "extra", &counter_config[i].extra);
 	}
 
 	return 0;
diff --git a/arch/x86/oprofile/op_counter.h b/arch/x86/oprofile/op_counter.h
index e28398d..0b7b7b1 100644
--- a/arch/x86/oprofile/op_counter.h
+++ b/arch/x86/oprofile/op_counter.h
@@ -22,6 +22,7 @@ struct op_counter_config {
 	unsigned long kernel;
 	unsigned long user;
 	unsigned long unit_mask;
+	unsigned long extra;
 };
 
 extern struct op_counter_config counter_config[];
-- 
1.7.4

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