linux-kernel - [PATCH] perf, x86, uncore: Disable SBOX driver on Haswell EP

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Date:	Thu, 30 Oct 2014 13:34:35 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	peterz@...radead.org
Cc:	mingo@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de,
	patrick.lu@...el.com, eranian@...gle.com,
	Andi Kleen <ak@...ux.intel.com>, alexei.starovoitov@...il.com
Subject: [PATCH] perf, x86, uncore: Disable SBOX driver on Haswell EP

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

There were several reports that enabling the freeze and reset
counter bits for the SBOX pmu on Haswell EP causes #GPs at boot,
preventing successfull boot. It only happens on some systems
(not on mine)

The problem is still under investigation.

For now just disable the SBOX uncore PMU. We can reenable it later
once it works everywhere.

Thanks to Alexei Starovoitov for debugging.

Cc: alexei.starovoitov@...il.com
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 .../x86/kernel/cpu/perf_event_intel_uncore_snbep.c | 30 ----------------------
 1 file changed, 30 deletions(-)

diff --git a/arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c b/arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c
index 286c692..54b877b 100644
--- a/arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_uncore_snbep.c
@@ -1923,35 +1923,6 @@ static struct intel_uncore_type hswep_uncore_cbox = {
 	.format_group		= &hswep_uncore_cbox_format_group,
 };
 
-static struct attribute *hswep_uncore_sbox_formats_attr[] = {
-	&format_attr_event.attr,
-	&format_attr_umask.attr,
-	&format_attr_edge.attr,
-	&format_attr_tid_en.attr,
-	&format_attr_inv.attr,
-	&format_attr_thresh8.attr,
-	NULL,
-};
-
-static struct attribute_group hswep_uncore_sbox_format_group = {
-	.name = "format",
-	.attrs = hswep_uncore_sbox_formats_attr,
-};
-
-static struct intel_uncore_type hswep_uncore_sbox = {
-	.name			= "sbox",
-	.num_counters		= 4,
-	.num_boxes		= 4,
-	.perf_ctr_bits		= 44,
-	.event_ctl		= HSWEP_S0_MSR_PMON_CTL0,
-	.perf_ctr		= HSWEP_S0_MSR_PMON_CTR0,
-	.event_mask		= HSWEP_S_MSR_PMON_RAW_EVENT_MASK,
-	.box_ctl		= HSWEP_S0_MSR_PMON_BOX_CTL,
-	.msr_offset		= HSWEP_SBOX_MSR_OFFSET,
-	.ops			= &snbep_uncore_msr_ops,
-	.format_group		= &hswep_uncore_sbox_format_group,
-};
-
 static int hswep_pcu_hw_config(struct intel_uncore_box *box, struct perf_event *event)
 {
 	struct hw_perf_event *hwc = &event->hw;
@@ -1990,7 +1961,6 @@ static struct intel_uncore_type hswep_uncore_pcu = {
 static struct intel_uncore_type *hswep_msr_uncores[] = {
 	&hswep_uncore_ubox,
 	&hswep_uncore_cbox,
-	&hswep_uncore_sbox,
 	&hswep_uncore_pcu,
 	NULL,
 };
-- 
1.9.3

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