2016-04-15 15:19:30

by Liang, Kan

Subject: [PATCH 1/1] x86, perf: add LBR filter support for SLM

From: Kan Liang <[email protected]>

LBR filtering is also supported on the Silvermont and Airmont
microarchitectures. The layout of MSR_LBR_SELECT is same as Nehalem.

Signed-off-by: Kan Liang <[email protected]>
---
arch/x86/events/intel/core.c | 2 +-
arch/x86/events/intel/lbr.c | 18 ++++++++++++++++++
arch/x86/events/perf_event.h | 2 ++
3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 931c13a..14d27e3 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3581,7 +3581,7 @@ __init int intel_pmu_init(void)
memcpy(hw_cache_extra_regs, slm_hw_cache_extra_regs,
sizeof(hw_cache_extra_regs));

- intel_pmu_lbr_init_atom();
+ intel_pmu_lbr_init_slm();

x86_pmu.event_constraints = intel_slm_event_constraints;
x86_pmu.pebs_constraints = intel_slm_pebs_event_constraints;
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index ad26ca7..317e29e 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1058,6 +1058,24 @@ void __init intel_pmu_lbr_init_atom(void)
pr_cont("8-deep LBR, ");
}

+/* slm */
+void __init intel_pmu_lbr_init_slm(void)
+{
+ x86_pmu.lbr_nr = 8;
+ x86_pmu.lbr_tos = MSR_LBR_TOS;
+ x86_pmu.lbr_from = MSR_LBR_CORE_FROM;
+ x86_pmu.lbr_to = MSR_LBR_CORE_TO;
+
+ x86_pmu.lbr_sel_mask = LBR_SEL_MASK;
+ x86_pmu.lbr_sel_map = nhm_lbr_sel_map;
+
+ /*
+ * SW branch filter usage:
+ * - compensate for lack of HW filter
+ */
+ pr_cont("8-deep LBR, ");
+}
+
/* Knights Landing */
void intel_pmu_lbr_init_knl(void)
{
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 8b78481..7d62a02 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -909,6 +909,8 @@ void intel_pmu_lbr_init_nhm(void);

void intel_pmu_lbr_init_atom(void);

+void intel_pmu_lbr_init_slm(void);
+
void intel_pmu_lbr_init_snb(void);

void intel_pmu_lbr_init_hsw(void);
--
2.5.0

2016-04-23 12:55:56

by tip-bot for Vasyl Gomonovych

Subject: [tip:perf/core] perf/x86/intel: Add LBR filter support for Silvermont and Airmont CPUs

Commit-ID: f21d5adceb7f2660e5227569faed278f6fb2072e
Gitweb: http://git.kernel.org/tip/f21d5adceb7f2660e5227569faed278f6fb2072e
Author: Kan Liang <[email protected]>
AuthorDate: Fri, 15 Apr 2016 00:53:45 -0700
Committer: Ingo Molnar <[email protected]>
CommitDate: Sat, 23 Apr 2016 14:12:31 +0200

perf/x86/intel: Add LBR filter support for Silvermont and Airmont CPUs

LBR filtering is also supported on the Silvermont and Airmont
microarchitectures. The layout of MSR_LBR_SELECT is the same as Nehalem.

Signed-off-by: Kan Liang <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vince Weaver <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
---
arch/x86/events/intel/core.c | 2 +-
arch/x86/events/intel/lbr.c | 18 ++++++++++++++++++
arch/x86/events/perf_event.h | 2 ++
3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 92fda6b..79b5943 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3581,7 +3581,7 @@ __init int intel_pmu_init(void)
memcpy(hw_cache_extra_regs, slm_hw_cache_extra_regs,
sizeof(hw_cache_extra_regs));

- intel_pmu_lbr_init_atom();
+ intel_pmu_lbr_init_slm();

x86_pmu.event_constraints = intel_slm_event_constraints;
x86_pmu.pebs_constraints = intel_slm_pebs_event_constraints;
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index ad26ca7..317e29e 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1058,6 +1058,24 @@ void __init intel_pmu_lbr_init_atom(void)
pr_cont("8-deep LBR, ");
}

+/* slm */
+void __init intel_pmu_lbr_init_slm(void)
+{
+ x86_pmu.lbr_nr = 8;
+ x86_pmu.lbr_tos = MSR_LBR_TOS;
+ x86_pmu.lbr_from = MSR_LBR_CORE_FROM;
+ x86_pmu.lbr_to = MSR_LBR_CORE_TO;
+
+ x86_pmu.lbr_sel_mask = LBR_SEL_MASK;
+ x86_pmu.lbr_sel_map = nhm_lbr_sel_map;
+
+ /*
+ * SW branch filter usage:
+ * - compensate for lack of HW filter
+ */
+ pr_cont("8-deep LBR, ");
+}
+
/* Knights Landing */
void intel_pmu_lbr_init_knl(void)
{
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 8b78481..7d62a02 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -909,6 +909,8 @@ void intel_pmu_lbr_init_nhm(void);

void intel_pmu_lbr_init_atom(void);

+void intel_pmu_lbr_init_slm(void);
+
void intel_pmu_lbr_init_snb(void);

void intel_pmu_lbr_init_hsw(void);