perf: Disable PERF_SAMPLE_BRANCH_* when not supported

PERF_SAMPLE_BRANCH_* is disabled for:

 - SW events (sw counters, tracepoints)
 - HW breakpoints
 - ALL but Intel x86 architecture
 - AMD64 processors

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1328826068-11713-10-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

9 files changed, 57 insertions, 0 deletions

diff --git a/arch/alpha/kernel/perf_event.c b/arch/alpha/kernel/perf_event.c
index 8143cd7cdbfb..0dae252f7a33 100644
--- a/arch/alpha/kernel/perf_event.c
+++ b/arch/alpha/kernel/perf_event.c
@@ -685,6 +685,10 @@ static int alpha_pmu_event_init(struct perf_event *event)
 {
         int err;
 
+        /* does not support taken branch sampling */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         switch (event->attr.type) {
         case PERF_TYPE_RAW:
         case PERF_TYPE_HARDWARE:
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 5bb91bf3d47f..a23c42abc694 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -539,6 +539,10 @@ static int armpmu_event_init(struct perf_event *event)
         int err = 0;
         atomic_t *active_events = &armpmu->active_events;
 
+        /* does not support taken branch sampling */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         if (armpmu->map_event(event) == -ENOENT)
                 return -ENOENT;
 
diff --git a/arch/mips/kernel/perf_event_mipsxx.c b/arch/mips/kernel/perf_event_mipsxx.c
index e3b897acfbc0..811084f4e422 100644
--- a/arch/mips/kernel/perf_event_mipsxx.c
+++ b/arch/mips/kernel/perf_event_mipsxx.c
@@ -606,6 +606,10 @@ static int mipspmu_event_init(struct perf_event *event)
 {
         int err = 0;
 
+        /* does not support taken branch sampling */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         switch (event->attr.type) {
         case PERF_TYPE_RAW:
         case PERF_TYPE_HARDWARE:
diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c
index f04c2301725e..c2e27ede07ec 100644
--- a/arch/powerpc/kernel/perf_event.c
+++ b/arch/powerpc/kernel/perf_event.c
@@ -1084,6 +1084,10 @@ static int power_pmu_event_init(struct perf_event *event)
         if (!ppmu)
                 return -ENOENT;
 
+        /* does not support taken branch sampling */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         switch (event->attr.type) {
         case PERF_TYPE_HARDWARE:
                 ev = event->attr.config;
diff --git a/arch/sh/kernel/perf_event.c b/arch/sh/kernel/perf_event.c
index 10b14e3a7eb8..068b8a2759b5 100644
--- a/arch/sh/kernel/perf_event.c
+++ b/arch/sh/kernel/perf_event.c
@@ -310,6 +310,10 @@ static int sh_pmu_event_init(struct perf_event *event)
 {
         int err;
 
+        /* does not support taken branch sampling */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         switch (event->attr.type) {
         case PERF_TYPE_RAW:
         case PERF_TYPE_HW_CACHE:
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c
index 614da624330c..8e16a4a21582 100644
--- a/arch/sparc/kernel/perf_event.c
+++ b/arch/sparc/kernel/perf_event.c
@@ -1105,6 +1105,10 @@ static int sparc_pmu_event_init(struct perf_event *event)
         if (atomic_read(&nmi_active) < 0)
                 return -ENODEV;
 
+        /* does not support taken branch sampling */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         switch (attr->type) {
         case PERF_TYPE_HARDWARE:
                 if (attr->config >= sparc_pmu->max_events)
diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index 67250a52430b..dd002faff7a6 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -139,6 +139,9 @@ static int amd_pmu_hw_config(struct perf_event *event)
         if (ret)
                 return ret;
 
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         if (event->attr.exclude_host && event->attr.exclude_guest)
                 /*
                  * When HO == GO == 1 the hardware treats that as GO == HO == 0
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 5820efdf47cd..242bb51c67f2 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5044,6 +5044,12 @@ static int perf_swevent_init(struct perf_event *event)
         if (event->attr.type != PERF_TYPE_SOFTWARE)
                 return -ENOENT;
 
+        /*
+         * no branch sampling for software events
+         */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         switch (event_id) {
         case PERF_COUNT_SW_CPU_CLOCK:
         case PERF_COUNT_SW_TASK_CLOCK:
@@ -5154,6 +5160,12 @@ static int perf_tp_event_init(struct perf_event *event)
         if (event->attr.type != PERF_TYPE_TRACEPOINT)
                 return -ENOENT;
 
+        /*
+         * no branch sampling for tracepoint events
+         */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         err = perf_trace_init(event);
         if (err)
                 return err;
@@ -5379,6 +5391,12 @@ static int cpu_clock_event_init(struct perf_event *event)
         if (event->attr.config != PERF_COUNT_SW_CPU_CLOCK)
                 return -ENOENT;
 
+        /*
+         * no branch sampling for software events
+         */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         perf_swevent_init_hrtimer(event);
 
         return 0;
@@ -5453,6 +5471,12 @@ static int task_clock_event_init(struct perf_event *event)
         if (event->attr.config != PERF_COUNT_SW_TASK_CLOCK)
                 return -ENOENT;
 
+        /*
+         * no branch sampling for software events
+         */
+        if (has_branch_stack(event))
+                return -EOPNOTSUPP;
+
         perf_swevent_init_hrtimer(event);
 
         return 0;
diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index 3330022a7ac1..bb38c4d3ee12 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -581,6 +581,12 @@ static int hw_breakpoint_event_init(struct perf_event *bp)
         if (bp->attr.type != PERF_TYPE_BREAKPOINT)
                 return -ENOENT;
 
+        /*
+         * no branch sampling for breakpoint events
+         */
+        if (has_branch_stack(bp))
+                return -EOPNOTSUPP;
+
         err = register_perf_hw_breakpoint(bp);
         if (err)
                 return err;