linux-kernel - [tip:perf/urgent] perf/x86/intel/uncore: Remove ev_sel

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Message-ID: <tip-cb2252522aaff572f28dc6613307e1e0e62496cd@git.kernel.org>
Date:	Mon, 21 Mar 2016 04:18:07 -0700
From:	tip-bot for Kan Liang <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	alexander.shishkin@...ux.intel.com, eranian@...gle.com,
	hpa@...or.com, linux-kernel@...r.kernel.org, acme@...hat.com,
	jolsa@...hat.com, torvalds@...ux-foundation.org, dsahern@...il.com,
	namhyung@...nel.org, peterz@...radead.org, mingo@...nel.org,
	kan.liang@...el.com, vincent.weaver@...ne.edu, tglx@...utronix.de
Subject: [tip:perf/urgent] perf/x86/intel/uncore: Remove ev_sel_ext bit
 support for PCU

Commit-ID:  cb2252522aaff572f28dc6613307e1e0e62496cd
Gitweb:     http://git.kernel.org/tip/cb2252522aaff572f28dc6613307e1e0e62496cd
Author:     Kan Liang <kan.liang@...el.com>
AuthorDate: Sun, 20 Mar 2016 11:58:21 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 21 Mar 2016 11:16:19 +0100

perf/x86/intel/uncore: Remove ev_sel_ext bit support for PCU

The ev_sel_ext in PCU_MSR_PMON_CTL is locked on some CPU models, so despite
it being documented in the SDM, if we write 1 to that bit then we can get a #GP
fault.

Which #GP the perf fuzzer happily triggered in Peter Zijlstra's testing.

Also, there are no public events which use that bit, so remove ev_sel_ext
bit support for PCU.

Reported-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Kan Liang <kan.liang@...el.com>
Acked-by: Peter Zijlstra <peterz@...radead.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Link: http://lkml.kernel.org/r/1458500301-3594-1-git-send-email-kan.liang@intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/intel/uncore_snbep.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 93f6bd9..ab2bcaa 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -46,7 +46,6 @@
 				(SNBEP_PMON_CTL_EV_SEL_MASK | \
 				 SNBEP_PCU_MSR_PMON_CTL_OCC_SEL_MASK | \
 				 SNBEP_PMON_CTL_EDGE_DET | \
-				 SNBEP_PMON_CTL_EV_SEL_EXT | \
 				 SNBEP_PMON_CTL_INVERT | \
 				 SNBEP_PCU_MSR_PMON_CTL_TRESH_MASK | \
 				 SNBEP_PCU_MSR_PMON_CTL_OCC_INVERT | \
@@ -148,7 +147,6 @@
 /* IVBEP PCU */
 #define IVBEP_PCU_MSR_PMON_RAW_EVENT_MASK	\
 				(SNBEP_PMON_CTL_EV_SEL_MASK | \
-				 SNBEP_PMON_CTL_EV_SEL_EXT | \
 				 SNBEP_PCU_MSR_PMON_CTL_OCC_SEL_MASK | \
 				 SNBEP_PMON_CTL_EDGE_DET | \
 				 SNBEP_PCU_MSR_PMON_CTL_TRESH_MASK | \
@@ -258,7 +256,6 @@
 				 SNBEP_PCU_MSR_PMON_CTL_OCC_SEL_MASK | \
 				 SNBEP_PMON_CTL_EDGE_DET | \
 				 SNBEP_CBO_PMON_CTL_TID_EN | \
-				 SNBEP_PMON_CTL_EV_SEL_EXT | \
 				 SNBEP_PMON_CTL_INVERT | \
 				 KNL_PCU_MSR_PMON_CTL_TRESH_MASK | \
 				 SNBEP_PCU_MSR_PMON_CTL_OCC_INVERT | \
@@ -472,7 +469,7 @@ static struct attribute *snbep_uncore_cbox_formats_attr[] = {
 };
 
 static struct attribute *snbep_uncore_pcu_formats_attr[] = {
-	&format_attr_event_ext.attr,
+	&format_attr_event.attr,
 	&format_attr_occ_sel.attr,
 	&format_attr_edge.attr,
 	&format_attr_inv.attr,
@@ -1313,7 +1310,7 @@ static struct attribute *ivbep_uncore_cbox_formats_attr[] = {
 };
 
 static struct attribute *ivbep_uncore_pcu_formats_attr[] = {
-	&format_attr_event_ext.attr,
+	&format_attr_event.attr,
 	&format_attr_occ_sel.attr,
 	&format_attr_edge.attr,
 	&format_attr_thresh5.attr,